1b411b363SPhilipp Reisner /* 2b411b363SPhilipp Reisner drbd_receiver.c 3b411b363SPhilipp Reisner 4b411b363SPhilipp Reisner This file is part of DRBD by Philipp Reisner and Lars Ellenberg. 5b411b363SPhilipp Reisner 6b411b363SPhilipp Reisner Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. 7b411b363SPhilipp Reisner Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. 8b411b363SPhilipp Reisner Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. 9b411b363SPhilipp Reisner 10b411b363SPhilipp Reisner drbd is free software; you can redistribute it and/or modify 11b411b363SPhilipp Reisner it under the terms of the GNU General Public License as published by 12b411b363SPhilipp Reisner the Free Software Foundation; either version 2, or (at your option) 13b411b363SPhilipp Reisner any later version. 14b411b363SPhilipp Reisner 15b411b363SPhilipp Reisner drbd is distributed in the hope that it will be useful, 16b411b363SPhilipp Reisner but WITHOUT ANY WARRANTY; without even the implied warranty of 17b411b363SPhilipp Reisner MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18b411b363SPhilipp Reisner GNU General Public License for more details. 19b411b363SPhilipp Reisner 20b411b363SPhilipp Reisner You should have received a copy of the GNU General Public License 21b411b363SPhilipp Reisner along with drbd; see the file COPYING. If not, write to 22b411b363SPhilipp Reisner the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 23b411b363SPhilipp Reisner */ 24b411b363SPhilipp Reisner 25b411b363SPhilipp Reisner 26b411b363SPhilipp Reisner #include <linux/module.h> 27b411b363SPhilipp Reisner 287e5fec31SFabian Frederick #include <linux/uaccess.h> 29b411b363SPhilipp Reisner #include <net/sock.h> 30b411b363SPhilipp Reisner 31b411b363SPhilipp Reisner #include <linux/drbd.h> 32b411b363SPhilipp Reisner #include <linux/fs.h> 33b411b363SPhilipp Reisner #include <linux/file.h> 34b411b363SPhilipp Reisner #include <linux/in.h> 35b411b363SPhilipp Reisner #include <linux/mm.h> 36b411b363SPhilipp Reisner #include <linux/memcontrol.h> 37b411b363SPhilipp Reisner #include <linux/mm_inline.h> 38b411b363SPhilipp Reisner #include <linux/slab.h> 39b411b363SPhilipp Reisner #include <linux/pkt_sched.h> 40b411b363SPhilipp Reisner #define __KERNEL_SYSCALLS__ 41b411b363SPhilipp Reisner #include <linux/unistd.h> 42b411b363SPhilipp Reisner #include <linux/vmalloc.h> 43b411b363SPhilipp Reisner #include <linux/random.h> 44b411b363SPhilipp Reisner #include <linux/string.h> 45b411b363SPhilipp Reisner #include <linux/scatterlist.h> 46b411b363SPhilipp Reisner #include "drbd_int.h" 47a3603a6eSAndreas Gruenbacher #include "drbd_protocol.h" 48b411b363SPhilipp Reisner #include "drbd_req.h" 49b411b363SPhilipp Reisner #include "drbd_vli.h" 50b411b363SPhilipp Reisner 519104d31aSLars Ellenberg #define PRO_FEATURES (DRBD_FF_TRIM|DRBD_FF_THIN_RESYNC|DRBD_FF_WSAME) 5220c68fdeSLars Ellenberg 5377351055SPhilipp Reisner struct packet_info { 5477351055SPhilipp Reisner enum drbd_packet cmd; 55e2857216SAndreas Gruenbacher unsigned int size; 56e2857216SAndreas Gruenbacher unsigned int vnr; 57e658983aSAndreas Gruenbacher void *data; 5877351055SPhilipp Reisner }; 5977351055SPhilipp Reisner 60b411b363SPhilipp Reisner enum finish_epoch { 61b411b363SPhilipp Reisner FE_STILL_LIVE, 62b411b363SPhilipp Reisner FE_DESTROYED, 63b411b363SPhilipp Reisner FE_RECYCLED, 64b411b363SPhilipp Reisner }; 65b411b363SPhilipp Reisner 66bde89a9eSAndreas Gruenbacher static int drbd_do_features(struct drbd_connection *connection); 67bde89a9eSAndreas Gruenbacher static int drbd_do_auth(struct drbd_connection *connection); 6869a22773SAndreas Gruenbacher static int drbd_disconnected(struct drbd_peer_device *); 69a0fb3c47SLars Ellenberg static void conn_wait_active_ee_empty(struct drbd_connection *connection); 70bde89a9eSAndreas Gruenbacher static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *, struct drbd_epoch *, enum epoch_event); 7199920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *, int); 72b411b363SPhilipp Reisner 73b411b363SPhilipp Reisner 74b411b363SPhilipp Reisner #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) 75b411b363SPhilipp Reisner 7645bb912bSLars Ellenberg /* 7745bb912bSLars Ellenberg * some helper functions to deal with single linked page lists, 7845bb912bSLars Ellenberg * page->private being our "next" pointer. 7945bb912bSLars Ellenberg */ 8045bb912bSLars Ellenberg 8145bb912bSLars Ellenberg /* If at least n pages are linked at head, get n pages off. 8245bb912bSLars Ellenberg * Otherwise, don't modify head, and return NULL. 8345bb912bSLars Ellenberg * Locking is the responsibility of the caller. 8445bb912bSLars Ellenberg */ 8545bb912bSLars Ellenberg static struct page *page_chain_del(struct page **head, int n) 8645bb912bSLars Ellenberg { 8745bb912bSLars Ellenberg struct page *page; 8845bb912bSLars Ellenberg struct page *tmp; 8945bb912bSLars Ellenberg 9045bb912bSLars Ellenberg BUG_ON(!n); 9145bb912bSLars Ellenberg BUG_ON(!head); 9245bb912bSLars Ellenberg 9345bb912bSLars Ellenberg page = *head; 9423ce4227SPhilipp Reisner 9523ce4227SPhilipp Reisner if (!page) 9623ce4227SPhilipp Reisner return NULL; 9723ce4227SPhilipp Reisner 9845bb912bSLars Ellenberg while (page) { 9945bb912bSLars Ellenberg tmp = page_chain_next(page); 10045bb912bSLars Ellenberg if (--n == 0) 10145bb912bSLars Ellenberg break; /* found sufficient pages */ 10245bb912bSLars Ellenberg if (tmp == NULL) 10345bb912bSLars Ellenberg /* insufficient pages, don't use any of them. */ 10445bb912bSLars Ellenberg return NULL; 10545bb912bSLars Ellenberg page = tmp; 10645bb912bSLars Ellenberg } 10745bb912bSLars Ellenberg 10845bb912bSLars Ellenberg /* add end of list marker for the returned list */ 10945bb912bSLars Ellenberg set_page_private(page, 0); 11045bb912bSLars Ellenberg /* actual return value, and adjustment of head */ 11145bb912bSLars Ellenberg page = *head; 11245bb912bSLars Ellenberg *head = tmp; 11345bb912bSLars Ellenberg return page; 11445bb912bSLars Ellenberg } 11545bb912bSLars Ellenberg 11645bb912bSLars Ellenberg /* may be used outside of locks to find the tail of a (usually short) 11745bb912bSLars Ellenberg * "private" page chain, before adding it back to a global chain head 11845bb912bSLars Ellenberg * with page_chain_add() under a spinlock. */ 11945bb912bSLars Ellenberg static struct page *page_chain_tail(struct page *page, int *len) 12045bb912bSLars Ellenberg { 12145bb912bSLars Ellenberg struct page *tmp; 12245bb912bSLars Ellenberg int i = 1; 12345bb912bSLars Ellenberg while ((tmp = page_chain_next(page))) 12445bb912bSLars Ellenberg ++i, page = tmp; 12545bb912bSLars Ellenberg if (len) 12645bb912bSLars Ellenberg *len = i; 12745bb912bSLars Ellenberg return page; 12845bb912bSLars Ellenberg } 12945bb912bSLars Ellenberg 13045bb912bSLars Ellenberg static int page_chain_free(struct page *page) 13145bb912bSLars Ellenberg { 13245bb912bSLars Ellenberg struct page *tmp; 13345bb912bSLars Ellenberg int i = 0; 13445bb912bSLars Ellenberg page_chain_for_each_safe(page, tmp) { 13545bb912bSLars Ellenberg put_page(page); 13645bb912bSLars Ellenberg ++i; 13745bb912bSLars Ellenberg } 13845bb912bSLars Ellenberg return i; 13945bb912bSLars Ellenberg } 14045bb912bSLars Ellenberg 14145bb912bSLars Ellenberg static void page_chain_add(struct page **head, 14245bb912bSLars Ellenberg struct page *chain_first, struct page *chain_last) 14345bb912bSLars Ellenberg { 14445bb912bSLars Ellenberg #if 1 14545bb912bSLars Ellenberg struct page *tmp; 14645bb912bSLars Ellenberg tmp = page_chain_tail(chain_first, NULL); 14745bb912bSLars Ellenberg BUG_ON(tmp != chain_last); 14845bb912bSLars Ellenberg #endif 14945bb912bSLars Ellenberg 15045bb912bSLars Ellenberg /* add chain to head */ 15145bb912bSLars Ellenberg set_page_private(chain_last, (unsigned long)*head); 15245bb912bSLars Ellenberg *head = chain_first; 15345bb912bSLars Ellenberg } 15445bb912bSLars Ellenberg 155b30ab791SAndreas Gruenbacher static struct page *__drbd_alloc_pages(struct drbd_device *device, 15618c2d522SAndreas Gruenbacher unsigned int number) 157b411b363SPhilipp Reisner { 158b411b363SPhilipp Reisner struct page *page = NULL; 15945bb912bSLars Ellenberg struct page *tmp = NULL; 16018c2d522SAndreas Gruenbacher unsigned int i = 0; 161b411b363SPhilipp Reisner 162b411b363SPhilipp Reisner /* Yes, testing drbd_pp_vacant outside the lock is racy. 163b411b363SPhilipp Reisner * So what. It saves a spin_lock. */ 16445bb912bSLars Ellenberg if (drbd_pp_vacant >= number) { 165b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 16645bb912bSLars Ellenberg page = page_chain_del(&drbd_pp_pool, number); 16745bb912bSLars Ellenberg if (page) 16845bb912bSLars Ellenberg drbd_pp_vacant -= number; 169b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 17045bb912bSLars Ellenberg if (page) 17145bb912bSLars Ellenberg return page; 172b411b363SPhilipp Reisner } 17345bb912bSLars Ellenberg 174b411b363SPhilipp Reisner /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD 175b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 176b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 17745bb912bSLars Ellenberg for (i = 0; i < number; i++) { 17845bb912bSLars Ellenberg tmp = alloc_page(GFP_TRY); 17945bb912bSLars Ellenberg if (!tmp) 18045bb912bSLars Ellenberg break; 18145bb912bSLars Ellenberg set_page_private(tmp, (unsigned long)page); 18245bb912bSLars Ellenberg page = tmp; 18345bb912bSLars Ellenberg } 18445bb912bSLars Ellenberg 18545bb912bSLars Ellenberg if (i == number) 186b411b363SPhilipp Reisner return page; 18745bb912bSLars Ellenberg 18845bb912bSLars Ellenberg /* Not enough pages immediately available this time. 189c37c8ecfSAndreas Gruenbacher * No need to jump around here, drbd_alloc_pages will retry this 19045bb912bSLars Ellenberg * function "soon". */ 19145bb912bSLars Ellenberg if (page) { 19245bb912bSLars Ellenberg tmp = page_chain_tail(page, NULL); 19345bb912bSLars Ellenberg spin_lock(&drbd_pp_lock); 19445bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 19545bb912bSLars Ellenberg drbd_pp_vacant += i; 19645bb912bSLars Ellenberg spin_unlock(&drbd_pp_lock); 19745bb912bSLars Ellenberg } 19845bb912bSLars Ellenberg return NULL; 199b411b363SPhilipp Reisner } 200b411b363SPhilipp Reisner 201b30ab791SAndreas Gruenbacher static void reclaim_finished_net_peer_reqs(struct drbd_device *device, 202a990be46SAndreas Gruenbacher struct list_head *to_be_freed) 203b411b363SPhilipp Reisner { 204a8cd15baSAndreas Gruenbacher struct drbd_peer_request *peer_req, *tmp; 205b411b363SPhilipp Reisner 206b411b363SPhilipp Reisner /* The EEs are always appended to the end of the list. Since 207b411b363SPhilipp Reisner they are sent in order over the wire, they have to finish 208b411b363SPhilipp Reisner in order. As soon as we see the first not finished we can 209b411b363SPhilipp Reisner stop to examine the list... */ 210b411b363SPhilipp Reisner 211a8cd15baSAndreas Gruenbacher list_for_each_entry_safe(peer_req, tmp, &device->net_ee, w.list) { 212045417f7SAndreas Gruenbacher if (drbd_peer_req_has_active_page(peer_req)) 213b411b363SPhilipp Reisner break; 214a8cd15baSAndreas Gruenbacher list_move(&peer_req->w.list, to_be_freed); 215b411b363SPhilipp Reisner } 216b411b363SPhilipp Reisner } 217b411b363SPhilipp Reisner 218668700b4SPhilipp Reisner static void drbd_reclaim_net_peer_reqs(struct drbd_device *device) 219b411b363SPhilipp Reisner { 220b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 221db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 222b411b363SPhilipp Reisner 2230500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 224b30ab791SAndreas Gruenbacher reclaim_finished_net_peer_reqs(device, &reclaimed); 2250500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 226a8cd15baSAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 227b30ab791SAndreas Gruenbacher drbd_free_net_peer_req(device, peer_req); 228b411b363SPhilipp Reisner } 229b411b363SPhilipp Reisner 230668700b4SPhilipp Reisner static void conn_reclaim_net_peer_reqs(struct drbd_connection *connection) 231668700b4SPhilipp Reisner { 232668700b4SPhilipp Reisner struct drbd_peer_device *peer_device; 233668700b4SPhilipp Reisner int vnr; 234668700b4SPhilipp Reisner 235668700b4SPhilipp Reisner rcu_read_lock(); 236668700b4SPhilipp Reisner idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { 237668700b4SPhilipp Reisner struct drbd_device *device = peer_device->device; 238668700b4SPhilipp Reisner if (!atomic_read(&device->pp_in_use_by_net)) 239668700b4SPhilipp Reisner continue; 240668700b4SPhilipp Reisner 241668700b4SPhilipp Reisner kref_get(&device->kref); 242668700b4SPhilipp Reisner rcu_read_unlock(); 243668700b4SPhilipp Reisner drbd_reclaim_net_peer_reqs(device); 244668700b4SPhilipp Reisner kref_put(&device->kref, drbd_destroy_device); 245668700b4SPhilipp Reisner rcu_read_lock(); 246668700b4SPhilipp Reisner } 247668700b4SPhilipp Reisner rcu_read_unlock(); 248668700b4SPhilipp Reisner } 249668700b4SPhilipp Reisner 250b411b363SPhilipp Reisner /** 251c37c8ecfSAndreas Gruenbacher * drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled) 252b30ab791SAndreas Gruenbacher * @device: DRBD device. 25345bb912bSLars Ellenberg * @number: number of pages requested 25445bb912bSLars Ellenberg * @retry: whether to retry, if not enough pages are available right now 255b411b363SPhilipp Reisner * 25645bb912bSLars Ellenberg * Tries to allocate number pages, first from our own page pool, then from 2570e49d7b0SLars Ellenberg * the kernel. 25845bb912bSLars Ellenberg * Possibly retry until DRBD frees sufficient pages somewhere else. 25945bb912bSLars Ellenberg * 2600e49d7b0SLars Ellenberg * If this allocation would exceed the max_buffers setting, we throttle 2610e49d7b0SLars Ellenberg * allocation (schedule_timeout) to give the system some room to breathe. 2620e49d7b0SLars Ellenberg * 2630e49d7b0SLars Ellenberg * We do not use max-buffers as hard limit, because it could lead to 2640e49d7b0SLars Ellenberg * congestion and further to a distributed deadlock during online-verify or 2650e49d7b0SLars Ellenberg * (checksum based) resync, if the max-buffers, socket buffer sizes and 2660e49d7b0SLars Ellenberg * resync-rate settings are mis-configured. 2670e49d7b0SLars Ellenberg * 26845bb912bSLars Ellenberg * Returns a page chain linked via page->private. 269b411b363SPhilipp Reisner */ 27069a22773SAndreas Gruenbacher struct page *drbd_alloc_pages(struct drbd_peer_device *peer_device, unsigned int number, 271c37c8ecfSAndreas Gruenbacher bool retry) 272b411b363SPhilipp Reisner { 27369a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 274b411b363SPhilipp Reisner struct page *page = NULL; 27544ed167dSPhilipp Reisner struct net_conf *nc; 276b411b363SPhilipp Reisner DEFINE_WAIT(wait); 2770e49d7b0SLars Ellenberg unsigned int mxb; 278b411b363SPhilipp Reisner 27944ed167dSPhilipp Reisner rcu_read_lock(); 28069a22773SAndreas Gruenbacher nc = rcu_dereference(peer_device->connection->net_conf); 28144ed167dSPhilipp Reisner mxb = nc ? nc->max_buffers : 1000000; 28244ed167dSPhilipp Reisner rcu_read_unlock(); 28344ed167dSPhilipp Reisner 284b30ab791SAndreas Gruenbacher if (atomic_read(&device->pp_in_use) < mxb) 285b30ab791SAndreas Gruenbacher page = __drbd_alloc_pages(device, number); 286b411b363SPhilipp Reisner 287668700b4SPhilipp Reisner /* Try to keep the fast path fast, but occasionally we need 288668700b4SPhilipp Reisner * to reclaim the pages we lended to the network stack. */ 289668700b4SPhilipp Reisner if (page && atomic_read(&device->pp_in_use_by_net) > 512) 290668700b4SPhilipp Reisner drbd_reclaim_net_peer_reqs(device); 291668700b4SPhilipp Reisner 29245bb912bSLars Ellenberg while (page == NULL) { 293b411b363SPhilipp Reisner prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); 294b411b363SPhilipp Reisner 295668700b4SPhilipp Reisner drbd_reclaim_net_peer_reqs(device); 296b411b363SPhilipp Reisner 297b30ab791SAndreas Gruenbacher if (atomic_read(&device->pp_in_use) < mxb) { 298b30ab791SAndreas Gruenbacher page = __drbd_alloc_pages(device, number); 299b411b363SPhilipp Reisner if (page) 300b411b363SPhilipp Reisner break; 301b411b363SPhilipp Reisner } 302b411b363SPhilipp Reisner 303b411b363SPhilipp Reisner if (!retry) 304b411b363SPhilipp Reisner break; 305b411b363SPhilipp Reisner 306b411b363SPhilipp Reisner if (signal_pending(current)) { 307d0180171SAndreas Gruenbacher drbd_warn(device, "drbd_alloc_pages interrupted!\n"); 308b411b363SPhilipp Reisner break; 309b411b363SPhilipp Reisner } 310b411b363SPhilipp Reisner 3110e49d7b0SLars Ellenberg if (schedule_timeout(HZ/10) == 0) 3120e49d7b0SLars Ellenberg mxb = UINT_MAX; 313b411b363SPhilipp Reisner } 314b411b363SPhilipp Reisner finish_wait(&drbd_pp_wait, &wait); 315b411b363SPhilipp Reisner 31645bb912bSLars Ellenberg if (page) 317b30ab791SAndreas Gruenbacher atomic_add(number, &device->pp_in_use); 318b411b363SPhilipp Reisner return page; 319b411b363SPhilipp Reisner } 320b411b363SPhilipp Reisner 321c37c8ecfSAndreas Gruenbacher /* Must not be used from irq, as that may deadlock: see drbd_alloc_pages. 3220500813fSAndreas Gruenbacher * Is also used from inside an other spin_lock_irq(&resource->req_lock); 32345bb912bSLars Ellenberg * Either links the page chain back to the global pool, 32445bb912bSLars Ellenberg * or returns all pages to the system. */ 325b30ab791SAndreas Gruenbacher static void drbd_free_pages(struct drbd_device *device, struct page *page, int is_net) 326b411b363SPhilipp Reisner { 327b30ab791SAndreas Gruenbacher atomic_t *a = is_net ? &device->pp_in_use_by_net : &device->pp_in_use; 328b411b363SPhilipp Reisner int i; 329435f0740SLars Ellenberg 330a73ff323SLars Ellenberg if (page == NULL) 331a73ff323SLars Ellenberg return; 332a73ff323SLars Ellenberg 3331816a2b4SLars Ellenberg if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count) 33445bb912bSLars Ellenberg i = page_chain_free(page); 33545bb912bSLars Ellenberg else { 33645bb912bSLars Ellenberg struct page *tmp; 33745bb912bSLars Ellenberg tmp = page_chain_tail(page, &i); 338b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 33945bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 34045bb912bSLars Ellenberg drbd_pp_vacant += i; 341b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 342b411b363SPhilipp Reisner } 343435f0740SLars Ellenberg i = atomic_sub_return(i, a); 34445bb912bSLars Ellenberg if (i < 0) 345d0180171SAndreas Gruenbacher drbd_warn(device, "ASSERTION FAILED: %s: %d < 0\n", 346435f0740SLars Ellenberg is_net ? "pp_in_use_by_net" : "pp_in_use", i); 347b411b363SPhilipp Reisner wake_up(&drbd_pp_wait); 348b411b363SPhilipp Reisner } 349b411b363SPhilipp Reisner 350b411b363SPhilipp Reisner /* 351b411b363SPhilipp Reisner You need to hold the req_lock: 352b411b363SPhilipp Reisner _drbd_wait_ee_list_empty() 353b411b363SPhilipp Reisner 354b411b363SPhilipp Reisner You must not have the req_lock: 3553967deb1SAndreas Gruenbacher drbd_free_peer_req() 3560db55363SAndreas Gruenbacher drbd_alloc_peer_req() 3577721f567SAndreas Gruenbacher drbd_free_peer_reqs() 358b411b363SPhilipp Reisner drbd_ee_fix_bhs() 359a990be46SAndreas Gruenbacher drbd_finish_peer_reqs() 360b411b363SPhilipp Reisner drbd_clear_done_ee() 361b411b363SPhilipp Reisner drbd_wait_ee_list_empty() 362b411b363SPhilipp Reisner */ 363b411b363SPhilipp Reisner 3649104d31aSLars Ellenberg /* normal: payload_size == request size (bi_size) 3659104d31aSLars Ellenberg * w_same: payload_size == logical_block_size 3669104d31aSLars Ellenberg * trim: payload_size == 0 */ 367f6ffca9fSAndreas Gruenbacher struct drbd_peer_request * 36869a22773SAndreas Gruenbacher drbd_alloc_peer_req(struct drbd_peer_device *peer_device, u64 id, sector_t sector, 3699104d31aSLars Ellenberg unsigned int request_size, unsigned int payload_size, gfp_t gfp_mask) __must_hold(local) 370b411b363SPhilipp Reisner { 37169a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 372db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 373a73ff323SLars Ellenberg struct page *page = NULL; 3749104d31aSLars Ellenberg unsigned nr_pages = (payload_size + PAGE_SIZE -1) >> PAGE_SHIFT; 375b411b363SPhilipp Reisner 376b30ab791SAndreas Gruenbacher if (drbd_insert_fault(device, DRBD_FAULT_AL_EE)) 377b411b363SPhilipp Reisner return NULL; 378b411b363SPhilipp Reisner 379db830c46SAndreas Gruenbacher peer_req = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); 380db830c46SAndreas Gruenbacher if (!peer_req) { 381b411b363SPhilipp Reisner if (!(gfp_mask & __GFP_NOWARN)) 382d0180171SAndreas Gruenbacher drbd_err(device, "%s: allocation failed\n", __func__); 383b411b363SPhilipp Reisner return NULL; 384b411b363SPhilipp Reisner } 385b411b363SPhilipp Reisner 3869104d31aSLars Ellenberg if (nr_pages) { 387d0164adcSMel Gorman page = drbd_alloc_pages(peer_device, nr_pages, 388d0164adcSMel Gorman gfpflags_allow_blocking(gfp_mask)); 38945bb912bSLars Ellenberg if (!page) 39045bb912bSLars Ellenberg goto fail; 391a73ff323SLars Ellenberg } 392b411b363SPhilipp Reisner 393c5a2c150SLars Ellenberg memset(peer_req, 0, sizeof(*peer_req)); 394c5a2c150SLars Ellenberg INIT_LIST_HEAD(&peer_req->w.list); 395db830c46SAndreas Gruenbacher drbd_clear_interval(&peer_req->i); 3969104d31aSLars Ellenberg peer_req->i.size = request_size; 397db830c46SAndreas Gruenbacher peer_req->i.sector = sector; 398c5a2c150SLars Ellenberg peer_req->submit_jif = jiffies; 399a8cd15baSAndreas Gruenbacher peer_req->peer_device = peer_device; 400db830c46SAndreas Gruenbacher peer_req->pages = page; 4019a8e7753SAndreas Gruenbacher /* 4029a8e7753SAndreas Gruenbacher * The block_id is opaque to the receiver. It is not endianness 4039a8e7753SAndreas Gruenbacher * converted, and sent back to the sender unchanged. 4049a8e7753SAndreas Gruenbacher */ 405db830c46SAndreas Gruenbacher peer_req->block_id = id; 406b411b363SPhilipp Reisner 407db830c46SAndreas Gruenbacher return peer_req; 408b411b363SPhilipp Reisner 40945bb912bSLars Ellenberg fail: 410db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 411b411b363SPhilipp Reisner return NULL; 412b411b363SPhilipp Reisner } 413b411b363SPhilipp Reisner 414b30ab791SAndreas Gruenbacher void __drbd_free_peer_req(struct drbd_device *device, struct drbd_peer_request *peer_req, 415f6ffca9fSAndreas Gruenbacher int is_net) 416b411b363SPhilipp Reisner { 41721ae5d7fSLars Ellenberg might_sleep(); 418db830c46SAndreas Gruenbacher if (peer_req->flags & EE_HAS_DIGEST) 419db830c46SAndreas Gruenbacher kfree(peer_req->digest); 420b30ab791SAndreas Gruenbacher drbd_free_pages(device, peer_req->pages, is_net); 4210b0ba1efSAndreas Gruenbacher D_ASSERT(device, atomic_read(&peer_req->pending_bios) == 0); 4220b0ba1efSAndreas Gruenbacher D_ASSERT(device, drbd_interval_empty(&peer_req->i)); 42321ae5d7fSLars Ellenberg if (!expect(!(peer_req->flags & EE_CALL_AL_COMPLETE_IO))) { 42421ae5d7fSLars Ellenberg peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; 42521ae5d7fSLars Ellenberg drbd_al_complete_io(device, &peer_req->i); 42621ae5d7fSLars Ellenberg } 427db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 428b411b363SPhilipp Reisner } 429b411b363SPhilipp Reisner 430b30ab791SAndreas Gruenbacher int drbd_free_peer_reqs(struct drbd_device *device, struct list_head *list) 431b411b363SPhilipp Reisner { 432b411b363SPhilipp Reisner LIST_HEAD(work_list); 433db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 434b411b363SPhilipp Reisner int count = 0; 435b30ab791SAndreas Gruenbacher int is_net = list == &device->net_ee; 436b411b363SPhilipp Reisner 4370500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 438b411b363SPhilipp Reisner list_splice_init(list, &work_list); 4390500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 440b411b363SPhilipp Reisner 441a8cd15baSAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 442b30ab791SAndreas Gruenbacher __drbd_free_peer_req(device, peer_req, is_net); 443b411b363SPhilipp Reisner count++; 444b411b363SPhilipp Reisner } 445b411b363SPhilipp Reisner return count; 446b411b363SPhilipp Reisner } 447b411b363SPhilipp Reisner 448b411b363SPhilipp Reisner /* 449a990be46SAndreas Gruenbacher * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. 450b411b363SPhilipp Reisner */ 451b30ab791SAndreas Gruenbacher static int drbd_finish_peer_reqs(struct drbd_device *device) 452b411b363SPhilipp Reisner { 453b411b363SPhilipp Reisner LIST_HEAD(work_list); 454b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 455db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 456e2b3032bSAndreas Gruenbacher int err = 0; 457b411b363SPhilipp Reisner 4580500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 459b30ab791SAndreas Gruenbacher reclaim_finished_net_peer_reqs(device, &reclaimed); 460b30ab791SAndreas Gruenbacher list_splice_init(&device->done_ee, &work_list); 4610500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 462b411b363SPhilipp Reisner 463a8cd15baSAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 464b30ab791SAndreas Gruenbacher drbd_free_net_peer_req(device, peer_req); 465b411b363SPhilipp Reisner 466b411b363SPhilipp Reisner /* possible callbacks here: 467d4dabbe2SLars Ellenberg * e_end_block, and e_end_resync_block, e_send_superseded. 468b411b363SPhilipp Reisner * all ignore the last argument. 469b411b363SPhilipp Reisner */ 470a8cd15baSAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 471e2b3032bSAndreas Gruenbacher int err2; 472e2b3032bSAndreas Gruenbacher 473b411b363SPhilipp Reisner /* list_del not necessary, next/prev members not touched */ 474a8cd15baSAndreas Gruenbacher err2 = peer_req->w.cb(&peer_req->w, !!err); 475e2b3032bSAndreas Gruenbacher if (!err) 476e2b3032bSAndreas Gruenbacher err = err2; 477b30ab791SAndreas Gruenbacher drbd_free_peer_req(device, peer_req); 478b411b363SPhilipp Reisner } 479b30ab791SAndreas Gruenbacher wake_up(&device->ee_wait); 480b411b363SPhilipp Reisner 481e2b3032bSAndreas Gruenbacher return err; 482b411b363SPhilipp Reisner } 483b411b363SPhilipp Reisner 484b30ab791SAndreas Gruenbacher static void _drbd_wait_ee_list_empty(struct drbd_device *device, 485d4da1537SAndreas Gruenbacher struct list_head *head) 486b411b363SPhilipp Reisner { 487b411b363SPhilipp Reisner DEFINE_WAIT(wait); 488b411b363SPhilipp Reisner 489b411b363SPhilipp Reisner /* avoids spin_lock/unlock 490b411b363SPhilipp Reisner * and calling prepare_to_wait in the fast path */ 491b411b363SPhilipp Reisner while (!list_empty(head)) { 492b30ab791SAndreas Gruenbacher prepare_to_wait(&device->ee_wait, &wait, TASK_UNINTERRUPTIBLE); 4930500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 4947eaceaccSJens Axboe io_schedule(); 495b30ab791SAndreas Gruenbacher finish_wait(&device->ee_wait, &wait); 4960500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 497b411b363SPhilipp Reisner } 498b411b363SPhilipp Reisner } 499b411b363SPhilipp Reisner 500b30ab791SAndreas Gruenbacher static void drbd_wait_ee_list_empty(struct drbd_device *device, 501d4da1537SAndreas Gruenbacher struct list_head *head) 502b411b363SPhilipp Reisner { 5030500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 504b30ab791SAndreas Gruenbacher _drbd_wait_ee_list_empty(device, head); 5050500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 506b411b363SPhilipp Reisner } 507b411b363SPhilipp Reisner 508dbd9eea0SPhilipp Reisner static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) 509b411b363SPhilipp Reisner { 510b411b363SPhilipp Reisner struct kvec iov = { 511b411b363SPhilipp Reisner .iov_base = buf, 512b411b363SPhilipp Reisner .iov_len = size, 513b411b363SPhilipp Reisner }; 514b411b363SPhilipp Reisner struct msghdr msg = { 515b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 516b411b363SPhilipp Reisner }; 517f730c848SAl Viro return kernel_recvmsg(sock, &msg, &iov, 1, size, msg.msg_flags); 518b411b363SPhilipp Reisner } 519b411b363SPhilipp Reisner 520bde89a9eSAndreas Gruenbacher static int drbd_recv(struct drbd_connection *connection, void *buf, size_t size) 521b411b363SPhilipp Reisner { 522b411b363SPhilipp Reisner int rv; 523b411b363SPhilipp Reisner 524bde89a9eSAndreas Gruenbacher rv = drbd_recv_short(connection->data.socket, buf, size, 0); 525b411b363SPhilipp Reisner 526b411b363SPhilipp Reisner if (rv < 0) { 527b411b363SPhilipp Reisner if (rv == -ECONNRESET) 5281ec861ebSAndreas Gruenbacher drbd_info(connection, "sock was reset by peer\n"); 529b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 5301ec861ebSAndreas Gruenbacher drbd_err(connection, "sock_recvmsg returned %d\n", rv); 531b411b363SPhilipp Reisner } else if (rv == 0) { 532bde89a9eSAndreas Gruenbacher if (test_bit(DISCONNECT_SENT, &connection->flags)) { 533b66623e3SPhilipp Reisner long t; 534b66623e3SPhilipp Reisner rcu_read_lock(); 535bde89a9eSAndreas Gruenbacher t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; 536b66623e3SPhilipp Reisner rcu_read_unlock(); 537b66623e3SPhilipp Reisner 538bde89a9eSAndreas Gruenbacher t = wait_event_timeout(connection->ping_wait, connection->cstate < C_WF_REPORT_PARAMS, t); 539b66623e3SPhilipp Reisner 540599377acSPhilipp Reisner if (t) 541599377acSPhilipp Reisner goto out; 542599377acSPhilipp Reisner } 5431ec861ebSAndreas Gruenbacher drbd_info(connection, "sock was shut down by peer\n"); 544599377acSPhilipp Reisner } 545599377acSPhilipp Reisner 546b411b363SPhilipp Reisner if (rv != size) 547bde89a9eSAndreas Gruenbacher conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD); 548b411b363SPhilipp Reisner 549599377acSPhilipp Reisner out: 550b411b363SPhilipp Reisner return rv; 551b411b363SPhilipp Reisner } 552b411b363SPhilipp Reisner 553bde89a9eSAndreas Gruenbacher static int drbd_recv_all(struct drbd_connection *connection, void *buf, size_t size) 554c6967746SAndreas Gruenbacher { 555c6967746SAndreas Gruenbacher int err; 556c6967746SAndreas Gruenbacher 557bde89a9eSAndreas Gruenbacher err = drbd_recv(connection, buf, size); 558c6967746SAndreas Gruenbacher if (err != size) { 559c6967746SAndreas Gruenbacher if (err >= 0) 560c6967746SAndreas Gruenbacher err = -EIO; 561c6967746SAndreas Gruenbacher } else 562c6967746SAndreas Gruenbacher err = 0; 563c6967746SAndreas Gruenbacher return err; 564c6967746SAndreas Gruenbacher } 565c6967746SAndreas Gruenbacher 566bde89a9eSAndreas Gruenbacher static int drbd_recv_all_warn(struct drbd_connection *connection, void *buf, size_t size) 567a5c31904SAndreas Gruenbacher { 568a5c31904SAndreas Gruenbacher int err; 569a5c31904SAndreas Gruenbacher 570bde89a9eSAndreas Gruenbacher err = drbd_recv_all(connection, buf, size); 571a5c31904SAndreas Gruenbacher if (err && !signal_pending(current)) 5721ec861ebSAndreas Gruenbacher drbd_warn(connection, "short read (expected size %d)\n", (int)size); 573a5c31904SAndreas Gruenbacher return err; 574a5c31904SAndreas Gruenbacher } 575a5c31904SAndreas Gruenbacher 5765dbf1673SLars Ellenberg /* quoting tcp(7): 5775dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5785dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5795dbf1673SLars Ellenberg * This is our wrapper to do so. 5805dbf1673SLars Ellenberg */ 5815dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 5825dbf1673SLars Ellenberg unsigned int rcv) 5835dbf1673SLars Ellenberg { 5845dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 5855dbf1673SLars Ellenberg if (snd) { 5865dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 5875dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 5885dbf1673SLars Ellenberg } 5895dbf1673SLars Ellenberg if (rcv) { 5905dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 5915dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 5925dbf1673SLars Ellenberg } 5935dbf1673SLars Ellenberg } 5945dbf1673SLars Ellenberg 595bde89a9eSAndreas Gruenbacher static struct socket *drbd_try_connect(struct drbd_connection *connection) 596b411b363SPhilipp Reisner { 597b411b363SPhilipp Reisner const char *what; 598b411b363SPhilipp Reisner struct socket *sock; 599b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 60044ed167dSPhilipp Reisner struct sockaddr_in6 peer_in6; 60144ed167dSPhilipp Reisner struct net_conf *nc; 60244ed167dSPhilipp Reisner int err, peer_addr_len, my_addr_len; 60369ef82deSAndreas Gruenbacher int sndbuf_size, rcvbuf_size, connect_int; 604b411b363SPhilipp Reisner int disconnect_on_error = 1; 605b411b363SPhilipp Reisner 60644ed167dSPhilipp Reisner rcu_read_lock(); 607bde89a9eSAndreas Gruenbacher nc = rcu_dereference(connection->net_conf); 60844ed167dSPhilipp Reisner if (!nc) { 60944ed167dSPhilipp Reisner rcu_read_unlock(); 610b411b363SPhilipp Reisner return NULL; 61144ed167dSPhilipp Reisner } 61244ed167dSPhilipp Reisner sndbuf_size = nc->sndbuf_size; 61344ed167dSPhilipp Reisner rcvbuf_size = nc->rcvbuf_size; 61469ef82deSAndreas Gruenbacher connect_int = nc->connect_int; 615089c075dSAndreas Gruenbacher rcu_read_unlock(); 61644ed167dSPhilipp Reisner 617bde89a9eSAndreas Gruenbacher my_addr_len = min_t(int, connection->my_addr_len, sizeof(src_in6)); 618bde89a9eSAndreas Gruenbacher memcpy(&src_in6, &connection->my_addr, my_addr_len); 61944ed167dSPhilipp Reisner 620bde89a9eSAndreas Gruenbacher if (((struct sockaddr *)&connection->my_addr)->sa_family == AF_INET6) 62144ed167dSPhilipp Reisner src_in6.sin6_port = 0; 62244ed167dSPhilipp Reisner else 62344ed167dSPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 62444ed167dSPhilipp Reisner 625bde89a9eSAndreas Gruenbacher peer_addr_len = min_t(int, connection->peer_addr_len, sizeof(src_in6)); 626bde89a9eSAndreas Gruenbacher memcpy(&peer_in6, &connection->peer_addr, peer_addr_len); 627b411b363SPhilipp Reisner 628b411b363SPhilipp Reisner what = "sock_create_kern"; 629eeb1bd5cSEric W. Biederman err = sock_create_kern(&init_net, ((struct sockaddr *)&src_in6)->sa_family, 630b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 631b411b363SPhilipp Reisner if (err < 0) { 632b411b363SPhilipp Reisner sock = NULL; 633b411b363SPhilipp Reisner goto out; 634b411b363SPhilipp Reisner } 635b411b363SPhilipp Reisner 636b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 63769ef82deSAndreas Gruenbacher sock->sk->sk_sndtimeo = connect_int * HZ; 63844ed167dSPhilipp Reisner drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); 639b411b363SPhilipp Reisner 640b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 641b411b363SPhilipp Reisner * for the outgoing connections. 642b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 643b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 644b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 645b411b363SPhilipp Reisner * a free one dynamically. 646b411b363SPhilipp Reisner */ 647b411b363SPhilipp Reisner what = "bind before connect"; 64844ed167dSPhilipp Reisner err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); 649b411b363SPhilipp Reisner if (err < 0) 650b411b363SPhilipp Reisner goto out; 651b411b363SPhilipp Reisner 652b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 653b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 654b411b363SPhilipp Reisner disconnect_on_error = 0; 655b411b363SPhilipp Reisner what = "connect"; 65644ed167dSPhilipp Reisner err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); 657b411b363SPhilipp Reisner 658b411b363SPhilipp Reisner out: 659b411b363SPhilipp Reisner if (err < 0) { 660b411b363SPhilipp Reisner if (sock) { 661b411b363SPhilipp Reisner sock_release(sock); 662b411b363SPhilipp Reisner sock = NULL; 663b411b363SPhilipp Reisner } 664b411b363SPhilipp Reisner switch (-err) { 665b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 666b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 667b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 668b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 669b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 670b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 671b411b363SPhilipp Reisner disconnect_on_error = 0; 672b411b363SPhilipp Reisner break; 673b411b363SPhilipp Reisner default: 6741ec861ebSAndreas Gruenbacher drbd_err(connection, "%s failed, err = %d\n", what, err); 675b411b363SPhilipp Reisner } 676b411b363SPhilipp Reisner if (disconnect_on_error) 677bde89a9eSAndreas Gruenbacher conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); 678b411b363SPhilipp Reisner } 67944ed167dSPhilipp Reisner 680b411b363SPhilipp Reisner return sock; 681b411b363SPhilipp Reisner } 682b411b363SPhilipp Reisner 6837a426fd8SPhilipp Reisner struct accept_wait_data { 684bde89a9eSAndreas Gruenbacher struct drbd_connection *connection; 6857a426fd8SPhilipp Reisner struct socket *s_listen; 6867a426fd8SPhilipp Reisner struct completion door_bell; 6877a426fd8SPhilipp Reisner void (*original_sk_state_change)(struct sock *sk); 6887a426fd8SPhilipp Reisner 6897a426fd8SPhilipp Reisner }; 6907a426fd8SPhilipp Reisner 691715306f6SAndreas Gruenbacher static void drbd_incoming_connection(struct sock *sk) 692b411b363SPhilipp Reisner { 6937a426fd8SPhilipp Reisner struct accept_wait_data *ad = sk->sk_user_data; 694715306f6SAndreas Gruenbacher void (*state_change)(struct sock *sk); 6957a426fd8SPhilipp Reisner 696715306f6SAndreas Gruenbacher state_change = ad->original_sk_state_change; 697715306f6SAndreas Gruenbacher if (sk->sk_state == TCP_ESTABLISHED) 6987a426fd8SPhilipp Reisner complete(&ad->door_bell); 699715306f6SAndreas Gruenbacher state_change(sk); 7007a426fd8SPhilipp Reisner } 7017a426fd8SPhilipp Reisner 702bde89a9eSAndreas Gruenbacher static int prepare_listen_socket(struct drbd_connection *connection, struct accept_wait_data *ad) 703b411b363SPhilipp Reisner { 7041f3e509bSPhilipp Reisner int err, sndbuf_size, rcvbuf_size, my_addr_len; 70544ed167dSPhilipp Reisner struct sockaddr_in6 my_addr; 7061f3e509bSPhilipp Reisner struct socket *s_listen; 70744ed167dSPhilipp Reisner struct net_conf *nc; 708b411b363SPhilipp Reisner const char *what; 709b411b363SPhilipp Reisner 71044ed167dSPhilipp Reisner rcu_read_lock(); 711bde89a9eSAndreas Gruenbacher nc = rcu_dereference(connection->net_conf); 71244ed167dSPhilipp Reisner if (!nc) { 71344ed167dSPhilipp Reisner rcu_read_unlock(); 7147a426fd8SPhilipp Reisner return -EIO; 71544ed167dSPhilipp Reisner } 71644ed167dSPhilipp Reisner sndbuf_size = nc->sndbuf_size; 71744ed167dSPhilipp Reisner rcvbuf_size = nc->rcvbuf_size; 71844ed167dSPhilipp Reisner rcu_read_unlock(); 719b411b363SPhilipp Reisner 720bde89a9eSAndreas Gruenbacher my_addr_len = min_t(int, connection->my_addr_len, sizeof(struct sockaddr_in6)); 721bde89a9eSAndreas Gruenbacher memcpy(&my_addr, &connection->my_addr, my_addr_len); 722b411b363SPhilipp Reisner 723b411b363SPhilipp Reisner what = "sock_create_kern"; 724eeb1bd5cSEric W. Biederman err = sock_create_kern(&init_net, ((struct sockaddr *)&my_addr)->sa_family, 725b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 726b411b363SPhilipp Reisner if (err) { 727b411b363SPhilipp Reisner s_listen = NULL; 728b411b363SPhilipp Reisner goto out; 729b411b363SPhilipp Reisner } 730b411b363SPhilipp Reisner 7314a17fd52SPavel Emelyanov s_listen->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ 73244ed167dSPhilipp Reisner drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); 733b411b363SPhilipp Reisner 734b411b363SPhilipp Reisner what = "bind before listen"; 73544ed167dSPhilipp Reisner err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); 736b411b363SPhilipp Reisner if (err < 0) 737b411b363SPhilipp Reisner goto out; 738b411b363SPhilipp Reisner 7397a426fd8SPhilipp Reisner ad->s_listen = s_listen; 7407a426fd8SPhilipp Reisner write_lock_bh(&s_listen->sk->sk_callback_lock); 7417a426fd8SPhilipp Reisner ad->original_sk_state_change = s_listen->sk->sk_state_change; 742715306f6SAndreas Gruenbacher s_listen->sk->sk_state_change = drbd_incoming_connection; 7437a426fd8SPhilipp Reisner s_listen->sk->sk_user_data = ad; 7447a426fd8SPhilipp Reisner write_unlock_bh(&s_listen->sk->sk_callback_lock); 745b411b363SPhilipp Reisner 7462820fd39SPhilipp Reisner what = "listen"; 7472820fd39SPhilipp Reisner err = s_listen->ops->listen(s_listen, 5); 7482820fd39SPhilipp Reisner if (err < 0) 7492820fd39SPhilipp Reisner goto out; 7502820fd39SPhilipp Reisner 7517a426fd8SPhilipp Reisner return 0; 752b411b363SPhilipp Reisner out: 753b411b363SPhilipp Reisner if (s_listen) 754b411b363SPhilipp Reisner sock_release(s_listen); 755b411b363SPhilipp Reisner if (err < 0) { 756b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 7571ec861ebSAndreas Gruenbacher drbd_err(connection, "%s failed, err = %d\n", what, err); 758bde89a9eSAndreas Gruenbacher conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); 759b411b363SPhilipp Reisner } 760b411b363SPhilipp Reisner } 7611f3e509bSPhilipp Reisner 7627a426fd8SPhilipp Reisner return -EIO; 7631f3e509bSPhilipp Reisner } 7641f3e509bSPhilipp Reisner 765715306f6SAndreas Gruenbacher static void unregister_state_change(struct sock *sk, struct accept_wait_data *ad) 766715306f6SAndreas Gruenbacher { 767715306f6SAndreas Gruenbacher write_lock_bh(&sk->sk_callback_lock); 768715306f6SAndreas Gruenbacher sk->sk_state_change = ad->original_sk_state_change; 769715306f6SAndreas Gruenbacher sk->sk_user_data = NULL; 770715306f6SAndreas Gruenbacher write_unlock_bh(&sk->sk_callback_lock); 771715306f6SAndreas Gruenbacher } 772715306f6SAndreas Gruenbacher 773bde89a9eSAndreas Gruenbacher static struct socket *drbd_wait_for_connect(struct drbd_connection *connection, struct accept_wait_data *ad) 7741f3e509bSPhilipp Reisner { 7751f3e509bSPhilipp Reisner int timeo, connect_int, err = 0; 7761f3e509bSPhilipp Reisner struct socket *s_estab = NULL; 7771f3e509bSPhilipp Reisner struct net_conf *nc; 7781f3e509bSPhilipp Reisner 7791f3e509bSPhilipp Reisner rcu_read_lock(); 780bde89a9eSAndreas Gruenbacher nc = rcu_dereference(connection->net_conf); 7811f3e509bSPhilipp Reisner if (!nc) { 7821f3e509bSPhilipp Reisner rcu_read_unlock(); 7831f3e509bSPhilipp Reisner return NULL; 7841f3e509bSPhilipp Reisner } 7851f3e509bSPhilipp Reisner connect_int = nc->connect_int; 7861f3e509bSPhilipp Reisner rcu_read_unlock(); 7871f3e509bSPhilipp Reisner 7881f3e509bSPhilipp Reisner timeo = connect_int * HZ; 78938b682b2SAkinobu Mita /* 28.5% random jitter */ 79038b682b2SAkinobu Mita timeo += (prandom_u32() & 1) ? timeo / 7 : -timeo / 7; 7911f3e509bSPhilipp Reisner 7927a426fd8SPhilipp Reisner err = wait_for_completion_interruptible_timeout(&ad->door_bell, timeo); 7937a426fd8SPhilipp Reisner if (err <= 0) 7947a426fd8SPhilipp Reisner return NULL; 7951f3e509bSPhilipp Reisner 7967a426fd8SPhilipp Reisner err = kernel_accept(ad->s_listen, &s_estab, 0); 797b411b363SPhilipp Reisner if (err < 0) { 798b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 7991ec861ebSAndreas Gruenbacher drbd_err(connection, "accept failed, err = %d\n", err); 800bde89a9eSAndreas Gruenbacher conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); 801b411b363SPhilipp Reisner } 802b411b363SPhilipp Reisner } 803b411b363SPhilipp Reisner 804715306f6SAndreas Gruenbacher if (s_estab) 805715306f6SAndreas Gruenbacher unregister_state_change(s_estab->sk, ad); 806b411b363SPhilipp Reisner 807b411b363SPhilipp Reisner return s_estab; 808b411b363SPhilipp Reisner } 809b411b363SPhilipp Reisner 810bde89a9eSAndreas Gruenbacher static int decode_header(struct drbd_connection *, void *, struct packet_info *); 811b411b363SPhilipp Reisner 812bde89a9eSAndreas Gruenbacher static int send_first_packet(struct drbd_connection *connection, struct drbd_socket *sock, 8139f5bdc33SAndreas Gruenbacher enum drbd_packet cmd) 8149f5bdc33SAndreas Gruenbacher { 815bde89a9eSAndreas Gruenbacher if (!conn_prepare_command(connection, sock)) 8169f5bdc33SAndreas Gruenbacher return -EIO; 817bde89a9eSAndreas Gruenbacher return conn_send_command(connection, sock, cmd, 0, NULL, 0); 818b411b363SPhilipp Reisner } 819b411b363SPhilipp Reisner 820bde89a9eSAndreas Gruenbacher static int receive_first_packet(struct drbd_connection *connection, struct socket *sock) 821b411b363SPhilipp Reisner { 822bde89a9eSAndreas Gruenbacher unsigned int header_size = drbd_header_size(connection); 8239f5bdc33SAndreas Gruenbacher struct packet_info pi; 8244920e37aSPhilipp Reisner struct net_conf *nc; 8259f5bdc33SAndreas Gruenbacher int err; 826b411b363SPhilipp Reisner 8274920e37aSPhilipp Reisner rcu_read_lock(); 8284920e37aSPhilipp Reisner nc = rcu_dereference(connection->net_conf); 8294920e37aSPhilipp Reisner if (!nc) { 8304920e37aSPhilipp Reisner rcu_read_unlock(); 8314920e37aSPhilipp Reisner return -EIO; 8324920e37aSPhilipp Reisner } 8334920e37aSPhilipp Reisner sock->sk->sk_rcvtimeo = nc->ping_timeo * 4 * HZ / 10; 8344920e37aSPhilipp Reisner rcu_read_unlock(); 8354920e37aSPhilipp Reisner 836bde89a9eSAndreas Gruenbacher err = drbd_recv_short(sock, connection->data.rbuf, header_size, 0); 8379f5bdc33SAndreas Gruenbacher if (err != header_size) { 8389f5bdc33SAndreas Gruenbacher if (err >= 0) 8399f5bdc33SAndreas Gruenbacher err = -EIO; 8409f5bdc33SAndreas Gruenbacher return err; 8419f5bdc33SAndreas Gruenbacher } 842bde89a9eSAndreas Gruenbacher err = decode_header(connection, connection->data.rbuf, &pi); 8439f5bdc33SAndreas Gruenbacher if (err) 8449f5bdc33SAndreas Gruenbacher return err; 8459f5bdc33SAndreas Gruenbacher return pi.cmd; 846b411b363SPhilipp Reisner } 847b411b363SPhilipp Reisner 848b411b363SPhilipp Reisner /** 849b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 850b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 851b411b363SPhilipp Reisner */ 8525d0b17f1SPhilipp Reisner static bool drbd_socket_okay(struct socket **sock) 853b411b363SPhilipp Reisner { 854b411b363SPhilipp Reisner int rr; 855b411b363SPhilipp Reisner char tb[4]; 856b411b363SPhilipp Reisner 857b411b363SPhilipp Reisner if (!*sock) 85881e84650SAndreas Gruenbacher return false; 859b411b363SPhilipp Reisner 860dbd9eea0SPhilipp Reisner rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 861b411b363SPhilipp Reisner 862b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 86381e84650SAndreas Gruenbacher return true; 864b411b363SPhilipp Reisner } else { 865b411b363SPhilipp Reisner sock_release(*sock); 866b411b363SPhilipp Reisner *sock = NULL; 86781e84650SAndreas Gruenbacher return false; 868b411b363SPhilipp Reisner } 869b411b363SPhilipp Reisner } 8705d0b17f1SPhilipp Reisner 8715d0b17f1SPhilipp Reisner static bool connection_established(struct drbd_connection *connection, 8725d0b17f1SPhilipp Reisner struct socket **sock1, 8735d0b17f1SPhilipp Reisner struct socket **sock2) 8745d0b17f1SPhilipp Reisner { 8755d0b17f1SPhilipp Reisner struct net_conf *nc; 8765d0b17f1SPhilipp Reisner int timeout; 8775d0b17f1SPhilipp Reisner bool ok; 8785d0b17f1SPhilipp Reisner 8795d0b17f1SPhilipp Reisner if (!*sock1 || !*sock2) 8805d0b17f1SPhilipp Reisner return false; 8815d0b17f1SPhilipp Reisner 8825d0b17f1SPhilipp Reisner rcu_read_lock(); 8835d0b17f1SPhilipp Reisner nc = rcu_dereference(connection->net_conf); 8845d0b17f1SPhilipp Reisner timeout = (nc->sock_check_timeo ?: nc->ping_timeo) * HZ / 10; 8855d0b17f1SPhilipp Reisner rcu_read_unlock(); 8865d0b17f1SPhilipp Reisner schedule_timeout_interruptible(timeout); 8875d0b17f1SPhilipp Reisner 8885d0b17f1SPhilipp Reisner ok = drbd_socket_okay(sock1); 8895d0b17f1SPhilipp Reisner ok = drbd_socket_okay(sock2) && ok; 8905d0b17f1SPhilipp Reisner 8915d0b17f1SPhilipp Reisner return ok; 8925d0b17f1SPhilipp Reisner } 8935d0b17f1SPhilipp Reisner 8942325eb66SPhilipp Reisner /* Gets called if a connection is established, or if a new minor gets created 8952325eb66SPhilipp Reisner in a connection */ 89669a22773SAndreas Gruenbacher int drbd_connected(struct drbd_peer_device *peer_device) 897907599e0SPhilipp Reisner { 89869a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 8990829f5edSAndreas Gruenbacher int err; 900907599e0SPhilipp Reisner 901b30ab791SAndreas Gruenbacher atomic_set(&device->packet_seq, 0); 902b30ab791SAndreas Gruenbacher device->peer_seq = 0; 903907599e0SPhilipp Reisner 90469a22773SAndreas Gruenbacher device->state_mutex = peer_device->connection->agreed_pro_version < 100 ? 90569a22773SAndreas Gruenbacher &peer_device->connection->cstate_mutex : 906b30ab791SAndreas Gruenbacher &device->own_state_mutex; 9078410da8fSPhilipp Reisner 90869a22773SAndreas Gruenbacher err = drbd_send_sync_param(peer_device); 9090829f5edSAndreas Gruenbacher if (!err) 91069a22773SAndreas Gruenbacher err = drbd_send_sizes(peer_device, 0, 0); 9110829f5edSAndreas Gruenbacher if (!err) 91269a22773SAndreas Gruenbacher err = drbd_send_uuids(peer_device); 9130829f5edSAndreas Gruenbacher if (!err) 91469a22773SAndreas Gruenbacher err = drbd_send_current_state(peer_device); 915b30ab791SAndreas Gruenbacher clear_bit(USE_DEGR_WFC_T, &device->flags); 916b30ab791SAndreas Gruenbacher clear_bit(RESIZE_PENDING, &device->flags); 917b30ab791SAndreas Gruenbacher atomic_set(&device->ap_in_flight, 0); 918b30ab791SAndreas Gruenbacher mod_timer(&device->request_timer, jiffies + HZ); /* just start it here. */ 9190829f5edSAndreas Gruenbacher return err; 920907599e0SPhilipp Reisner } 921b411b363SPhilipp Reisner 922b411b363SPhilipp Reisner /* 923b411b363SPhilipp Reisner * return values: 924b411b363SPhilipp Reisner * 1 yes, we have a valid connection 925b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 926b411b363SPhilipp Reisner * -1 peer talks different language, 927b411b363SPhilipp Reisner * no point in trying again, please go standalone. 928b411b363SPhilipp Reisner * -2 We do not have a network config... 929b411b363SPhilipp Reisner */ 930bde89a9eSAndreas Gruenbacher static int conn_connect(struct drbd_connection *connection) 931b411b363SPhilipp Reisner { 9327da35862SPhilipp Reisner struct drbd_socket sock, msock; 933c06ece6bSAndreas Gruenbacher struct drbd_peer_device *peer_device; 93444ed167dSPhilipp Reisner struct net_conf *nc; 9355d0b17f1SPhilipp Reisner int vnr, timeout, h; 9365d0b17f1SPhilipp Reisner bool discard_my_data, ok; 937197296ffSPhilipp Reisner enum drbd_state_rv rv; 9387a426fd8SPhilipp Reisner struct accept_wait_data ad = { 939bde89a9eSAndreas Gruenbacher .connection = connection, 9407a426fd8SPhilipp Reisner .door_bell = COMPLETION_INITIALIZER_ONSTACK(ad.door_bell), 9417a426fd8SPhilipp Reisner }; 942b411b363SPhilipp Reisner 943bde89a9eSAndreas Gruenbacher clear_bit(DISCONNECT_SENT, &connection->flags); 944bde89a9eSAndreas Gruenbacher if (conn_request_state(connection, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) 945b411b363SPhilipp Reisner return -2; 946b411b363SPhilipp Reisner 9477da35862SPhilipp Reisner mutex_init(&sock.mutex); 948bde89a9eSAndreas Gruenbacher sock.sbuf = connection->data.sbuf; 949bde89a9eSAndreas Gruenbacher sock.rbuf = connection->data.rbuf; 9507da35862SPhilipp Reisner sock.socket = NULL; 9517da35862SPhilipp Reisner mutex_init(&msock.mutex); 952bde89a9eSAndreas Gruenbacher msock.sbuf = connection->meta.sbuf; 953bde89a9eSAndreas Gruenbacher msock.rbuf = connection->meta.rbuf; 9547da35862SPhilipp Reisner msock.socket = NULL; 9557da35862SPhilipp Reisner 9560916e0e3SAndreas Gruenbacher /* Assume that the peer only understands protocol 80 until we know better. */ 957bde89a9eSAndreas Gruenbacher connection->agreed_pro_version = 80; 958b411b363SPhilipp Reisner 959bde89a9eSAndreas Gruenbacher if (prepare_listen_socket(connection, &ad)) 9607a426fd8SPhilipp Reisner return 0; 961b411b363SPhilipp Reisner 962b411b363SPhilipp Reisner do { 9632bf89621SAndreas Gruenbacher struct socket *s; 964b411b363SPhilipp Reisner 965bde89a9eSAndreas Gruenbacher s = drbd_try_connect(connection); 966b411b363SPhilipp Reisner if (s) { 9677da35862SPhilipp Reisner if (!sock.socket) { 9687da35862SPhilipp Reisner sock.socket = s; 969bde89a9eSAndreas Gruenbacher send_first_packet(connection, &sock, P_INITIAL_DATA); 9707da35862SPhilipp Reisner } else if (!msock.socket) { 971bde89a9eSAndreas Gruenbacher clear_bit(RESOLVE_CONFLICTS, &connection->flags); 9727da35862SPhilipp Reisner msock.socket = s; 973bde89a9eSAndreas Gruenbacher send_first_packet(connection, &msock, P_INITIAL_META); 974b411b363SPhilipp Reisner } else { 9751ec861ebSAndreas Gruenbacher drbd_err(connection, "Logic error in conn_connect()\n"); 976b411b363SPhilipp Reisner goto out_release_sockets; 977b411b363SPhilipp Reisner } 978b411b363SPhilipp Reisner } 979b411b363SPhilipp Reisner 9805d0b17f1SPhilipp Reisner if (connection_established(connection, &sock.socket, &msock.socket)) 981b411b363SPhilipp Reisner break; 982b411b363SPhilipp Reisner 983b411b363SPhilipp Reisner retry: 984bde89a9eSAndreas Gruenbacher s = drbd_wait_for_connect(connection, &ad); 985b411b363SPhilipp Reisner if (s) { 986bde89a9eSAndreas Gruenbacher int fp = receive_first_packet(connection, s); 9877da35862SPhilipp Reisner drbd_socket_okay(&sock.socket); 9887da35862SPhilipp Reisner drbd_socket_okay(&msock.socket); 98992f14951SPhilipp Reisner switch (fp) { 990e5d6f33aSAndreas Gruenbacher case P_INITIAL_DATA: 9917da35862SPhilipp Reisner if (sock.socket) { 9921ec861ebSAndreas Gruenbacher drbd_warn(connection, "initial packet S crossed\n"); 9937da35862SPhilipp Reisner sock_release(sock.socket); 99480c6eed4SPhilipp Reisner sock.socket = s; 99580c6eed4SPhilipp Reisner goto randomize; 996b411b363SPhilipp Reisner } 9977da35862SPhilipp Reisner sock.socket = s; 998b411b363SPhilipp Reisner break; 999e5d6f33aSAndreas Gruenbacher case P_INITIAL_META: 1000bde89a9eSAndreas Gruenbacher set_bit(RESOLVE_CONFLICTS, &connection->flags); 10017da35862SPhilipp Reisner if (msock.socket) { 10021ec861ebSAndreas Gruenbacher drbd_warn(connection, "initial packet M crossed\n"); 10037da35862SPhilipp Reisner sock_release(msock.socket); 100480c6eed4SPhilipp Reisner msock.socket = s; 100580c6eed4SPhilipp Reisner goto randomize; 1006b411b363SPhilipp Reisner } 10077da35862SPhilipp Reisner msock.socket = s; 1008b411b363SPhilipp Reisner break; 1009b411b363SPhilipp Reisner default: 10101ec861ebSAndreas Gruenbacher drbd_warn(connection, "Error receiving initial packet\n"); 1011b411b363SPhilipp Reisner sock_release(s); 101280c6eed4SPhilipp Reisner randomize: 101338b682b2SAkinobu Mita if (prandom_u32() & 1) 1014b411b363SPhilipp Reisner goto retry; 1015b411b363SPhilipp Reisner } 1016b411b363SPhilipp Reisner } 1017b411b363SPhilipp Reisner 1018bde89a9eSAndreas Gruenbacher if (connection->cstate <= C_DISCONNECTING) 1019b411b363SPhilipp Reisner goto out_release_sockets; 1020b411b363SPhilipp Reisner if (signal_pending(current)) { 1021b411b363SPhilipp Reisner flush_signals(current); 1022b411b363SPhilipp Reisner smp_rmb(); 1023bde89a9eSAndreas Gruenbacher if (get_t_state(&connection->receiver) == EXITING) 1024b411b363SPhilipp Reisner goto out_release_sockets; 1025b411b363SPhilipp Reisner } 1026b411b363SPhilipp Reisner 10275d0b17f1SPhilipp Reisner ok = connection_established(connection, &sock.socket, &msock.socket); 1028b666dbf8SPhilipp Reisner } while (!ok); 1029b411b363SPhilipp Reisner 10307a426fd8SPhilipp Reisner if (ad.s_listen) 10317a426fd8SPhilipp Reisner sock_release(ad.s_listen); 1032b411b363SPhilipp Reisner 103398683650SPhilipp Reisner sock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ 103498683650SPhilipp Reisner msock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ 1035b411b363SPhilipp Reisner 10367da35862SPhilipp Reisner sock.socket->sk->sk_allocation = GFP_NOIO; 10377da35862SPhilipp Reisner msock.socket->sk->sk_allocation = GFP_NOIO; 1038b411b363SPhilipp Reisner 10397da35862SPhilipp Reisner sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 10407da35862SPhilipp Reisner msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE; 1041b411b363SPhilipp Reisner 1042b411b363SPhilipp Reisner /* NOT YET ... 1043bde89a9eSAndreas Gruenbacher * sock.socket->sk->sk_sndtimeo = connection->net_conf->timeout*HZ/10; 10447da35862SPhilipp Reisner * sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 10456038178eSAndreas Gruenbacher * first set it to the P_CONNECTION_FEATURES timeout, 1046b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 104744ed167dSPhilipp Reisner rcu_read_lock(); 1048bde89a9eSAndreas Gruenbacher nc = rcu_dereference(connection->net_conf); 1049b411b363SPhilipp Reisner 10507da35862SPhilipp Reisner sock.socket->sk->sk_sndtimeo = 10517da35862SPhilipp Reisner sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; 105244ed167dSPhilipp Reisner 10537da35862SPhilipp Reisner msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ; 105444ed167dSPhilipp Reisner timeout = nc->timeout * HZ / 10; 105508b165baSPhilipp Reisner discard_my_data = nc->discard_my_data; 105644ed167dSPhilipp Reisner rcu_read_unlock(); 105744ed167dSPhilipp Reisner 10587da35862SPhilipp Reisner msock.socket->sk->sk_sndtimeo = timeout; 1059b411b363SPhilipp Reisner 1060b411b363SPhilipp Reisner /* we don't want delays. 106125985edcSLucas De Marchi * we use TCP_CORK where appropriate, though */ 10627da35862SPhilipp Reisner drbd_tcp_nodelay(sock.socket); 10637da35862SPhilipp Reisner drbd_tcp_nodelay(msock.socket); 1064b411b363SPhilipp Reisner 1065bde89a9eSAndreas Gruenbacher connection->data.socket = sock.socket; 1066bde89a9eSAndreas Gruenbacher connection->meta.socket = msock.socket; 1067bde89a9eSAndreas Gruenbacher connection->last_received = jiffies; 1068b411b363SPhilipp Reisner 1069bde89a9eSAndreas Gruenbacher h = drbd_do_features(connection); 1070b411b363SPhilipp Reisner if (h <= 0) 1071b411b363SPhilipp Reisner return h; 1072b411b363SPhilipp Reisner 1073bde89a9eSAndreas Gruenbacher if (connection->cram_hmac_tfm) { 1074b30ab791SAndreas Gruenbacher /* drbd_request_state(device, NS(conn, WFAuth)); */ 1075bde89a9eSAndreas Gruenbacher switch (drbd_do_auth(connection)) { 1076b10d96cbSJohannes Thoma case -1: 10771ec861ebSAndreas Gruenbacher drbd_err(connection, "Authentication of peer failed\n"); 1078b411b363SPhilipp Reisner return -1; 1079b10d96cbSJohannes Thoma case 0: 10801ec861ebSAndreas Gruenbacher drbd_err(connection, "Authentication of peer failed, trying again.\n"); 1081b10d96cbSJohannes Thoma return 0; 1082b411b363SPhilipp Reisner } 1083b411b363SPhilipp Reisner } 1084b411b363SPhilipp Reisner 1085bde89a9eSAndreas Gruenbacher connection->data.socket->sk->sk_sndtimeo = timeout; 1086bde89a9eSAndreas Gruenbacher connection->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1087b411b363SPhilipp Reisner 1088bde89a9eSAndreas Gruenbacher if (drbd_send_protocol(connection) == -EOPNOTSUPP) 10897e2455c1SPhilipp Reisner return -1; 10901e86ac48SPhilipp Reisner 109113c76abaSPhilipp Reisner /* Prevent a race between resync-handshake and 109213c76abaSPhilipp Reisner * being promoted to Primary. 109313c76abaSPhilipp Reisner * 109413c76abaSPhilipp Reisner * Grab and release the state mutex, so we know that any current 109513c76abaSPhilipp Reisner * drbd_set_role() is finished, and any incoming drbd_set_role 109613c76abaSPhilipp Reisner * will see the STATE_SENT flag, and wait for it to be cleared. 109713c76abaSPhilipp Reisner */ 109831007745SPhilipp Reisner idr_for_each_entry(&connection->peer_devices, peer_device, vnr) 109931007745SPhilipp Reisner mutex_lock(peer_device->device->state_mutex); 110031007745SPhilipp Reisner 110131007745SPhilipp Reisner set_bit(STATE_SENT, &connection->flags); 110231007745SPhilipp Reisner 110331007745SPhilipp Reisner idr_for_each_entry(&connection->peer_devices, peer_device, vnr) 110431007745SPhilipp Reisner mutex_unlock(peer_device->device->state_mutex); 110531007745SPhilipp Reisner 110631007745SPhilipp Reisner rcu_read_lock(); 110731007745SPhilipp Reisner idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { 110831007745SPhilipp Reisner struct drbd_device *device = peer_device->device; 110931007745SPhilipp Reisner kref_get(&device->kref); 111031007745SPhilipp Reisner rcu_read_unlock(); 111113c76abaSPhilipp Reisner 111208b165baSPhilipp Reisner if (discard_my_data) 1113b30ab791SAndreas Gruenbacher set_bit(DISCARD_MY_DATA, &device->flags); 111408b165baSPhilipp Reisner else 1115b30ab791SAndreas Gruenbacher clear_bit(DISCARD_MY_DATA, &device->flags); 111608b165baSPhilipp Reisner 111769a22773SAndreas Gruenbacher drbd_connected(peer_device); 111805a10ec7SAndreas Gruenbacher kref_put(&device->kref, drbd_destroy_device); 1119c141ebdaSPhilipp Reisner rcu_read_lock(); 1120c141ebdaSPhilipp Reisner } 1121c141ebdaSPhilipp Reisner rcu_read_unlock(); 1122c141ebdaSPhilipp Reisner 1123bde89a9eSAndreas Gruenbacher rv = conn_request_state(connection, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE); 1124bde89a9eSAndreas Gruenbacher if (rv < SS_SUCCESS || connection->cstate != C_WF_REPORT_PARAMS) { 1125bde89a9eSAndreas Gruenbacher clear_bit(STATE_SENT, &connection->flags); 11261e86ac48SPhilipp Reisner return 0; 1127a1096a6eSPhilipp Reisner } 11281e86ac48SPhilipp Reisner 11291c03e520SPhilipp Reisner drbd_thread_start(&connection->ack_receiver); 113039e91a60SLars Ellenberg /* opencoded create_singlethread_workqueue(), 113139e91a60SLars Ellenberg * to be able to use format string arguments */ 113239e91a60SLars Ellenberg connection->ack_sender = 113339e91a60SLars Ellenberg alloc_ordered_workqueue("drbd_as_%s", WQ_MEM_RECLAIM, connection->resource->name); 1134668700b4SPhilipp Reisner if (!connection->ack_sender) { 1135668700b4SPhilipp Reisner drbd_err(connection, "Failed to create workqueue ack_sender\n"); 1136668700b4SPhilipp Reisner return 0; 1137668700b4SPhilipp Reisner } 1138b411b363SPhilipp Reisner 11390500813fSAndreas Gruenbacher mutex_lock(&connection->resource->conf_update); 114008b165baSPhilipp Reisner /* The discard_my_data flag is a single-shot modifier to the next 114108b165baSPhilipp Reisner * connection attempt, the handshake of which is now well underway. 114208b165baSPhilipp Reisner * No need for rcu style copying of the whole struct 114308b165baSPhilipp Reisner * just to clear a single value. */ 1144bde89a9eSAndreas Gruenbacher connection->net_conf->discard_my_data = 0; 11450500813fSAndreas Gruenbacher mutex_unlock(&connection->resource->conf_update); 114608b165baSPhilipp Reisner 1147d3fcb490SPhilipp Reisner return h; 1148b411b363SPhilipp Reisner 1149b411b363SPhilipp Reisner out_release_sockets: 11507a426fd8SPhilipp Reisner if (ad.s_listen) 11517a426fd8SPhilipp Reisner sock_release(ad.s_listen); 11527da35862SPhilipp Reisner if (sock.socket) 11537da35862SPhilipp Reisner sock_release(sock.socket); 11547da35862SPhilipp Reisner if (msock.socket) 11557da35862SPhilipp Reisner sock_release(msock.socket); 1156b411b363SPhilipp Reisner return -1; 1157b411b363SPhilipp Reisner } 1158b411b363SPhilipp Reisner 1159bde89a9eSAndreas Gruenbacher static int decode_header(struct drbd_connection *connection, void *header, struct packet_info *pi) 1160b411b363SPhilipp Reisner { 1161bde89a9eSAndreas Gruenbacher unsigned int header_size = drbd_header_size(connection); 1162b411b363SPhilipp Reisner 11630c8e36d9SAndreas Gruenbacher if (header_size == sizeof(struct p_header100) && 11640c8e36d9SAndreas Gruenbacher *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { 11650c8e36d9SAndreas Gruenbacher struct p_header100 *h = header; 11660c8e36d9SAndreas Gruenbacher if (h->pad != 0) { 11671ec861ebSAndreas Gruenbacher drbd_err(connection, "Header padding is not zero\n"); 11680c8e36d9SAndreas Gruenbacher return -EINVAL; 116902918be2SPhilipp Reisner } 11700c8e36d9SAndreas Gruenbacher pi->vnr = be16_to_cpu(h->volume); 11710c8e36d9SAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 11720c8e36d9SAndreas Gruenbacher pi->size = be32_to_cpu(h->length); 11730c8e36d9SAndreas Gruenbacher } else if (header_size == sizeof(struct p_header95) && 1174e658983aSAndreas Gruenbacher *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { 1175e658983aSAndreas Gruenbacher struct p_header95 *h = header; 1176e658983aSAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 1177b55d84baSAndreas Gruenbacher pi->size = be32_to_cpu(h->length); 1178eefc2f7dSPhilipp Reisner pi->vnr = 0; 1179e658983aSAndreas Gruenbacher } else if (header_size == sizeof(struct p_header80) && 1180e658983aSAndreas Gruenbacher *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { 1181e658983aSAndreas Gruenbacher struct p_header80 *h = header; 1182e658983aSAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 1183e658983aSAndreas Gruenbacher pi->size = be16_to_cpu(h->length); 118477351055SPhilipp Reisner pi->vnr = 0; 118502918be2SPhilipp Reisner } else { 11861ec861ebSAndreas Gruenbacher drbd_err(connection, "Wrong magic value 0x%08x in protocol version %d\n", 1187e658983aSAndreas Gruenbacher be32_to_cpu(*(__be32 *)header), 1188bde89a9eSAndreas Gruenbacher connection->agreed_pro_version); 11898172f3e9SAndreas Gruenbacher return -EINVAL; 1190b411b363SPhilipp Reisner } 1191e658983aSAndreas Gruenbacher pi->data = header + header_size; 11928172f3e9SAndreas Gruenbacher return 0; 1193b411b363SPhilipp Reisner } 1194b411b363SPhilipp Reisner 1195bde89a9eSAndreas Gruenbacher static int drbd_recv_header(struct drbd_connection *connection, struct packet_info *pi) 1196257d0af6SPhilipp Reisner { 1197bde89a9eSAndreas Gruenbacher void *buffer = connection->data.rbuf; 119869bc7bc3SAndreas Gruenbacher int err; 1199257d0af6SPhilipp Reisner 1200bde89a9eSAndreas Gruenbacher err = drbd_recv_all_warn(connection, buffer, drbd_header_size(connection)); 1201a5c31904SAndreas Gruenbacher if (err) 120269bc7bc3SAndreas Gruenbacher return err; 1203257d0af6SPhilipp Reisner 1204bde89a9eSAndreas Gruenbacher err = decode_header(connection, buffer, pi); 1205bde89a9eSAndreas Gruenbacher connection->last_received = jiffies; 1206b411b363SPhilipp Reisner 120769bc7bc3SAndreas Gruenbacher return err; 1208b411b363SPhilipp Reisner } 1209b411b363SPhilipp Reisner 1210f9ff0da5SLars Ellenberg /* This is blkdev_issue_flush, but asynchronous. 1211f9ff0da5SLars Ellenberg * We want to submit to all component volumes in parallel, 1212f9ff0da5SLars Ellenberg * then wait for all completions. 1213f9ff0da5SLars Ellenberg */ 1214f9ff0da5SLars Ellenberg struct issue_flush_context { 1215f9ff0da5SLars Ellenberg atomic_t pending; 1216f9ff0da5SLars Ellenberg int error; 1217f9ff0da5SLars Ellenberg struct completion done; 1218f9ff0da5SLars Ellenberg }; 1219f9ff0da5SLars Ellenberg struct one_flush_context { 1220f9ff0da5SLars Ellenberg struct drbd_device *device; 1221f9ff0da5SLars Ellenberg struct issue_flush_context *ctx; 1222f9ff0da5SLars Ellenberg }; 1223f9ff0da5SLars Ellenberg 1224f9ff0da5SLars Ellenberg void one_flush_endio(struct bio *bio) 1225f9ff0da5SLars Ellenberg { 1226f9ff0da5SLars Ellenberg struct one_flush_context *octx = bio->bi_private; 1227f9ff0da5SLars Ellenberg struct drbd_device *device = octx->device; 1228f9ff0da5SLars Ellenberg struct issue_flush_context *ctx = octx->ctx; 1229f9ff0da5SLars Ellenberg 1230f9ff0da5SLars Ellenberg if (bio->bi_error) { 1231f9ff0da5SLars Ellenberg ctx->error = bio->bi_error; 1232f9ff0da5SLars Ellenberg drbd_info(device, "local disk FLUSH FAILED with status %d\n", bio->bi_error); 1233f9ff0da5SLars Ellenberg } 1234f9ff0da5SLars Ellenberg kfree(octx); 1235f9ff0da5SLars Ellenberg bio_put(bio); 1236f9ff0da5SLars Ellenberg 1237f9ff0da5SLars Ellenberg clear_bit(FLUSH_PENDING, &device->flags); 1238f9ff0da5SLars Ellenberg put_ldev(device); 1239f9ff0da5SLars Ellenberg kref_put(&device->kref, drbd_destroy_device); 1240f9ff0da5SLars Ellenberg 1241f9ff0da5SLars Ellenberg if (atomic_dec_and_test(&ctx->pending)) 1242f9ff0da5SLars Ellenberg complete(&ctx->done); 1243f9ff0da5SLars Ellenberg } 1244f9ff0da5SLars Ellenberg 1245f9ff0da5SLars Ellenberg static void submit_one_flush(struct drbd_device *device, struct issue_flush_context *ctx) 1246f9ff0da5SLars Ellenberg { 1247f9ff0da5SLars Ellenberg struct bio *bio = bio_alloc(GFP_NOIO, 0); 1248f9ff0da5SLars Ellenberg struct one_flush_context *octx = kmalloc(sizeof(*octx), GFP_NOIO); 1249f9ff0da5SLars Ellenberg if (!bio || !octx) { 1250f9ff0da5SLars Ellenberg drbd_warn(device, "Could not allocate a bio, CANNOT ISSUE FLUSH\n"); 1251f9ff0da5SLars Ellenberg /* FIXME: what else can I do now? disconnecting or detaching 1252f9ff0da5SLars Ellenberg * really does not help to improve the state of the world, either. 1253f9ff0da5SLars Ellenberg */ 1254f9ff0da5SLars Ellenberg kfree(octx); 1255f9ff0da5SLars Ellenberg if (bio) 1256f9ff0da5SLars Ellenberg bio_put(bio); 1257f9ff0da5SLars Ellenberg 1258f9ff0da5SLars Ellenberg ctx->error = -ENOMEM; 1259f9ff0da5SLars Ellenberg put_ldev(device); 1260f9ff0da5SLars Ellenberg kref_put(&device->kref, drbd_destroy_device); 1261f9ff0da5SLars Ellenberg return; 1262f9ff0da5SLars Ellenberg } 1263f9ff0da5SLars Ellenberg 1264f9ff0da5SLars Ellenberg octx->device = device; 1265f9ff0da5SLars Ellenberg octx->ctx = ctx; 1266f9ff0da5SLars Ellenberg bio->bi_bdev = device->ldev->backing_bdev; 1267f9ff0da5SLars Ellenberg bio->bi_private = octx; 1268f9ff0da5SLars Ellenberg bio->bi_end_io = one_flush_endio; 126970fd7614SChristoph Hellwig bio->bi_opf = REQ_OP_FLUSH | REQ_PREFLUSH; 1270f9ff0da5SLars Ellenberg 1271f9ff0da5SLars Ellenberg device->flush_jif = jiffies; 1272f9ff0da5SLars Ellenberg set_bit(FLUSH_PENDING, &device->flags); 1273f9ff0da5SLars Ellenberg atomic_inc(&ctx->pending); 1274f9ff0da5SLars Ellenberg submit_bio(bio); 1275f9ff0da5SLars Ellenberg } 1276f9ff0da5SLars Ellenberg 1277bde89a9eSAndreas Gruenbacher static void drbd_flush(struct drbd_connection *connection) 1278b411b363SPhilipp Reisner { 1279f9ff0da5SLars Ellenberg if (connection->resource->write_ordering >= WO_BDEV_FLUSH) { 1280c06ece6bSAndreas Gruenbacher struct drbd_peer_device *peer_device; 1281f9ff0da5SLars Ellenberg struct issue_flush_context ctx; 12824b0007c0SPhilipp Reisner int vnr; 1283b411b363SPhilipp Reisner 1284f9ff0da5SLars Ellenberg atomic_set(&ctx.pending, 1); 1285f9ff0da5SLars Ellenberg ctx.error = 0; 1286f9ff0da5SLars Ellenberg init_completion(&ctx.done); 1287f9ff0da5SLars Ellenberg 1288615e087fSLars Ellenberg rcu_read_lock(); 1289c06ece6bSAndreas Gruenbacher idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { 1290c06ece6bSAndreas Gruenbacher struct drbd_device *device = peer_device->device; 1291c06ece6bSAndreas Gruenbacher 1292b30ab791SAndreas Gruenbacher if (!get_ldev(device)) 1293615e087fSLars Ellenberg continue; 1294b30ab791SAndreas Gruenbacher kref_get(&device->kref); 1295615e087fSLars Ellenberg rcu_read_unlock(); 12964b0007c0SPhilipp Reisner 1297f9ff0da5SLars Ellenberg submit_one_flush(device, &ctx); 1298f9ff0da5SLars Ellenberg 1299f9ff0da5SLars Ellenberg rcu_read_lock(); 1300f9ff0da5SLars Ellenberg } 1301f9ff0da5SLars Ellenberg rcu_read_unlock(); 1302f9ff0da5SLars Ellenberg 1303f9ff0da5SLars Ellenberg /* Do we want to add a timeout, 1304f9ff0da5SLars Ellenberg * if disk-timeout is set? */ 1305f9ff0da5SLars Ellenberg if (!atomic_dec_and_test(&ctx.pending)) 1306f9ff0da5SLars Ellenberg wait_for_completion(&ctx.done); 1307f9ff0da5SLars Ellenberg 1308f9ff0da5SLars Ellenberg if (ctx.error) { 1309b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 1310b411b363SPhilipp Reisner * don't try again for ANY return value != 0 1311b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 1312f9ff0da5SLars Ellenberg /* Any error is already reported by bio_endio callback. */ 1313f6ba8636SAndreas Gruenbacher drbd_bump_write_ordering(connection->resource, NULL, WO_DRAIN_IO); 1314b411b363SPhilipp Reisner } 1315b411b363SPhilipp Reisner } 1316b411b363SPhilipp Reisner } 1317b411b363SPhilipp Reisner 1318b411b363SPhilipp Reisner /** 1319b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 1320b30ab791SAndreas Gruenbacher * @device: DRBD device. 1321b411b363SPhilipp Reisner * @epoch: Epoch object. 1322b411b363SPhilipp Reisner * @ev: Epoch event. 1323b411b363SPhilipp Reisner */ 1324bde89a9eSAndreas Gruenbacher static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *connection, 1325b411b363SPhilipp Reisner struct drbd_epoch *epoch, 1326b411b363SPhilipp Reisner enum epoch_event ev) 1327b411b363SPhilipp Reisner { 13282451fc3bSPhilipp Reisner int epoch_size; 1329b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 1330b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 1331b411b363SPhilipp Reisner 1332bde89a9eSAndreas Gruenbacher spin_lock(&connection->epoch_lock); 1333b411b363SPhilipp Reisner do { 1334b411b363SPhilipp Reisner next_epoch = NULL; 1335b411b363SPhilipp Reisner 1336b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 1337b411b363SPhilipp Reisner 1338b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 1339b411b363SPhilipp Reisner case EV_PUT: 1340b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1341b411b363SPhilipp Reisner break; 1342b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1343b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1344b411b363SPhilipp Reisner break; 1345b411b363SPhilipp Reisner case EV_BECAME_LAST: 1346b411b363SPhilipp Reisner /* nothing to do*/ 1347b411b363SPhilipp Reisner break; 1348b411b363SPhilipp Reisner } 1349b411b363SPhilipp Reisner 1350b411b363SPhilipp Reisner if (epoch_size != 0 && 1351b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 135280f9fd55SPhilipp Reisner (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { 1353b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1354bde89a9eSAndreas Gruenbacher spin_unlock(&connection->epoch_lock); 1355bde89a9eSAndreas Gruenbacher drbd_send_b_ack(epoch->connection, epoch->barrier_nr, epoch_size); 1356bde89a9eSAndreas Gruenbacher spin_lock(&connection->epoch_lock); 1357b411b363SPhilipp Reisner } 13589ed57dcbSLars Ellenberg #if 0 13599ed57dcbSLars Ellenberg /* FIXME: dec unacked on connection, once we have 13609ed57dcbSLars Ellenberg * something to count pending connection packets in. */ 136180f9fd55SPhilipp Reisner if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) 1362bde89a9eSAndreas Gruenbacher dec_unacked(epoch->connection); 13639ed57dcbSLars Ellenberg #endif 1364b411b363SPhilipp Reisner 1365bde89a9eSAndreas Gruenbacher if (connection->current_epoch != epoch) { 1366b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1367b411b363SPhilipp Reisner list_del(&epoch->list); 1368b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1369bde89a9eSAndreas Gruenbacher connection->epochs--; 1370b411b363SPhilipp Reisner kfree(epoch); 1371b411b363SPhilipp Reisner 1372b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1373b411b363SPhilipp Reisner rv = FE_DESTROYED; 1374b411b363SPhilipp Reisner } else { 1375b411b363SPhilipp Reisner epoch->flags = 0; 1376b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1377698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1378b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1379b411b363SPhilipp Reisner rv = FE_RECYCLED; 1380b411b363SPhilipp Reisner } 1381b411b363SPhilipp Reisner } 1382b411b363SPhilipp Reisner 1383b411b363SPhilipp Reisner if (!next_epoch) 1384b411b363SPhilipp Reisner break; 1385b411b363SPhilipp Reisner 1386b411b363SPhilipp Reisner epoch = next_epoch; 1387b411b363SPhilipp Reisner } while (1); 1388b411b363SPhilipp Reisner 1389bde89a9eSAndreas Gruenbacher spin_unlock(&connection->epoch_lock); 1390b411b363SPhilipp Reisner 1391b411b363SPhilipp Reisner return rv; 1392b411b363SPhilipp Reisner } 1393b411b363SPhilipp Reisner 13948fe39aacSPhilipp Reisner static enum write_ordering_e 13958fe39aacSPhilipp Reisner max_allowed_wo(struct drbd_backing_dev *bdev, enum write_ordering_e wo) 13968fe39aacSPhilipp Reisner { 13978fe39aacSPhilipp Reisner struct disk_conf *dc; 13988fe39aacSPhilipp Reisner 13998fe39aacSPhilipp Reisner dc = rcu_dereference(bdev->disk_conf); 14008fe39aacSPhilipp Reisner 1401f6ba8636SAndreas Gruenbacher if (wo == WO_BDEV_FLUSH && !dc->disk_flushes) 1402f6ba8636SAndreas Gruenbacher wo = WO_DRAIN_IO; 1403f6ba8636SAndreas Gruenbacher if (wo == WO_DRAIN_IO && !dc->disk_drain) 1404f6ba8636SAndreas Gruenbacher wo = WO_NONE; 14058fe39aacSPhilipp Reisner 14068fe39aacSPhilipp Reisner return wo; 14078fe39aacSPhilipp Reisner } 14088fe39aacSPhilipp Reisner 1409b411b363SPhilipp Reisner /** 1410b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1411bde89a9eSAndreas Gruenbacher * @connection: DRBD connection. 1412b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1413b411b363SPhilipp Reisner */ 14148fe39aacSPhilipp Reisner void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backing_dev *bdev, 14158fe39aacSPhilipp Reisner enum write_ordering_e wo) 1416b411b363SPhilipp Reisner { 1417e9526580SPhilipp Reisner struct drbd_device *device; 1418b411b363SPhilipp Reisner enum write_ordering_e pwo; 14194b0007c0SPhilipp Reisner int vnr; 1420b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1421f6ba8636SAndreas Gruenbacher [WO_NONE] = "none", 1422f6ba8636SAndreas Gruenbacher [WO_DRAIN_IO] = "drain", 1423f6ba8636SAndreas Gruenbacher [WO_BDEV_FLUSH] = "flush", 1424b411b363SPhilipp Reisner }; 1425b411b363SPhilipp Reisner 1426e9526580SPhilipp Reisner pwo = resource->write_ordering; 1427f6ba8636SAndreas Gruenbacher if (wo != WO_BDEV_FLUSH) 1428b411b363SPhilipp Reisner wo = min(pwo, wo); 1429daeda1ccSPhilipp Reisner rcu_read_lock(); 1430e9526580SPhilipp Reisner idr_for_each_entry(&resource->devices, device, vnr) { 14318fe39aacSPhilipp Reisner if (get_ldev(device)) { 14328fe39aacSPhilipp Reisner wo = max_allowed_wo(device->ldev, wo); 14338fe39aacSPhilipp Reisner if (device->ldev == bdev) 14348fe39aacSPhilipp Reisner bdev = NULL; 1435b30ab791SAndreas Gruenbacher put_ldev(device); 14364b0007c0SPhilipp Reisner } 14378fe39aacSPhilipp Reisner } 14388fe39aacSPhilipp Reisner 14398fe39aacSPhilipp Reisner if (bdev) 14408fe39aacSPhilipp Reisner wo = max_allowed_wo(bdev, wo); 14418fe39aacSPhilipp Reisner 144270df7092SLars Ellenberg rcu_read_unlock(); 144370df7092SLars Ellenberg 1444e9526580SPhilipp Reisner resource->write_ordering = wo; 1445f6ba8636SAndreas Gruenbacher if (pwo != resource->write_ordering || wo == WO_BDEV_FLUSH) 1446e9526580SPhilipp Reisner drbd_info(resource, "Method to ensure write ordering: %s\n", write_ordering_str[resource->write_ordering]); 1447b411b363SPhilipp Reisner } 1448b411b363SPhilipp Reisner 1449dd4f699dSLars Ellenberg /* 1450dd4f699dSLars Ellenberg * We *may* ignore the discard-zeroes-data setting, if so configured. 1451dd4f699dSLars Ellenberg * 1452dd4f699dSLars Ellenberg * Assumption is that it "discard_zeroes_data=0" is only because the backend 1453dd4f699dSLars Ellenberg * may ignore partial unaligned discards. 1454dd4f699dSLars Ellenberg * 1455dd4f699dSLars Ellenberg * LVM/DM thin as of at least 1456dd4f699dSLars Ellenberg * LVM version: 2.02.115(2)-RHEL7 (2015-01-28) 1457dd4f699dSLars Ellenberg * Library version: 1.02.93-RHEL7 (2015-01-28) 1458dd4f699dSLars Ellenberg * Driver version: 4.29.0 1459dd4f699dSLars Ellenberg * still behaves this way. 1460dd4f699dSLars Ellenberg * 1461dd4f699dSLars Ellenberg * For unaligned (wrt. alignment and granularity) or too small discards, 1462dd4f699dSLars Ellenberg * we zero-out the initial (and/or) trailing unaligned partial chunks, 1463dd4f699dSLars Ellenberg * but discard all the aligned full chunks. 1464dd4f699dSLars Ellenberg * 1465dd4f699dSLars Ellenberg * At least for LVM/DM thin, the result is effectively "discard_zeroes_data=1". 1466dd4f699dSLars Ellenberg */ 1467dd4f699dSLars Ellenberg int drbd_issue_discard_or_zero_out(struct drbd_device *device, sector_t start, unsigned int nr_sectors, bool discard) 1468dd4f699dSLars Ellenberg { 1469dd4f699dSLars Ellenberg struct block_device *bdev = device->ldev->backing_bdev; 1470dd4f699dSLars Ellenberg struct request_queue *q = bdev_get_queue(bdev); 1471dd4f699dSLars Ellenberg sector_t tmp, nr; 1472dd4f699dSLars Ellenberg unsigned int max_discard_sectors, granularity; 1473dd4f699dSLars Ellenberg int alignment; 1474dd4f699dSLars Ellenberg int err = 0; 1475dd4f699dSLars Ellenberg 1476dd4f699dSLars Ellenberg if (!discard) 1477dd4f699dSLars Ellenberg goto zero_out; 1478dd4f699dSLars Ellenberg 1479dd4f699dSLars Ellenberg /* Zero-sector (unknown) and one-sector granularities are the same. */ 1480dd4f699dSLars Ellenberg granularity = max(q->limits.discard_granularity >> 9, 1U); 1481dd4f699dSLars Ellenberg alignment = (bdev_discard_alignment(bdev) >> 9) % granularity; 1482dd4f699dSLars Ellenberg 1483dd4f699dSLars Ellenberg max_discard_sectors = min(q->limits.max_discard_sectors, (1U << 22)); 1484dd4f699dSLars Ellenberg max_discard_sectors -= max_discard_sectors % granularity; 1485dd4f699dSLars Ellenberg if (unlikely(!max_discard_sectors)) 1486dd4f699dSLars Ellenberg goto zero_out; 1487dd4f699dSLars Ellenberg 1488dd4f699dSLars Ellenberg if (nr_sectors < granularity) 1489dd4f699dSLars Ellenberg goto zero_out; 1490dd4f699dSLars Ellenberg 1491dd4f699dSLars Ellenberg tmp = start; 1492dd4f699dSLars Ellenberg if (sector_div(tmp, granularity) != alignment) { 1493dd4f699dSLars Ellenberg if (nr_sectors < 2*granularity) 1494dd4f699dSLars Ellenberg goto zero_out; 1495dd4f699dSLars Ellenberg /* start + gran - (start + gran - align) % gran */ 1496dd4f699dSLars Ellenberg tmp = start + granularity - alignment; 1497dd4f699dSLars Ellenberg tmp = start + granularity - sector_div(tmp, granularity); 1498dd4f699dSLars Ellenberg 1499dd4f699dSLars Ellenberg nr = tmp - start; 1500dd4f699dSLars Ellenberg err |= blkdev_issue_zeroout(bdev, start, nr, GFP_NOIO, 0); 1501dd4f699dSLars Ellenberg nr_sectors -= nr; 1502dd4f699dSLars Ellenberg start = tmp; 1503dd4f699dSLars Ellenberg } 1504dd4f699dSLars Ellenberg while (nr_sectors >= granularity) { 1505dd4f699dSLars Ellenberg nr = min_t(sector_t, nr_sectors, max_discard_sectors); 1506dd4f699dSLars Ellenberg err |= blkdev_issue_discard(bdev, start, nr, GFP_NOIO, 0); 1507dd4f699dSLars Ellenberg nr_sectors -= nr; 1508dd4f699dSLars Ellenberg start += nr; 1509dd4f699dSLars Ellenberg } 1510dd4f699dSLars Ellenberg zero_out: 1511dd4f699dSLars Ellenberg if (nr_sectors) { 1512dd4f699dSLars Ellenberg err |= blkdev_issue_zeroout(bdev, start, nr_sectors, GFP_NOIO, 0); 1513dd4f699dSLars Ellenberg } 1514dd4f699dSLars Ellenberg return err != 0; 1515dd4f699dSLars Ellenberg } 1516dd4f699dSLars Ellenberg 1517dd4f699dSLars Ellenberg static bool can_do_reliable_discards(struct drbd_device *device) 1518dd4f699dSLars Ellenberg { 1519dd4f699dSLars Ellenberg struct request_queue *q = bdev_get_queue(device->ldev->backing_bdev); 1520dd4f699dSLars Ellenberg struct disk_conf *dc; 1521dd4f699dSLars Ellenberg bool can_do; 1522dd4f699dSLars Ellenberg 1523dd4f699dSLars Ellenberg if (!blk_queue_discard(q)) 1524dd4f699dSLars Ellenberg return false; 1525dd4f699dSLars Ellenberg 1526dd4f699dSLars Ellenberg if (q->limits.discard_zeroes_data) 1527dd4f699dSLars Ellenberg return true; 1528dd4f699dSLars Ellenberg 1529dd4f699dSLars Ellenberg rcu_read_lock(); 1530dd4f699dSLars Ellenberg dc = rcu_dereference(device->ldev->disk_conf); 1531dd4f699dSLars Ellenberg can_do = dc->discard_zeroes_if_aligned; 1532dd4f699dSLars Ellenberg rcu_read_unlock(); 1533dd4f699dSLars Ellenberg return can_do; 1534dd4f699dSLars Ellenberg } 1535dd4f699dSLars Ellenberg 15369104d31aSLars Ellenberg static void drbd_issue_peer_discard(struct drbd_device *device, struct drbd_peer_request *peer_req) 1537dd4f699dSLars Ellenberg { 1538dd4f699dSLars Ellenberg /* If the backend cannot discard, or does not guarantee 1539dd4f699dSLars Ellenberg * read-back zeroes in discarded ranges, we fall back to 1540dd4f699dSLars Ellenberg * zero-out. Unless configuration specifically requested 1541dd4f699dSLars Ellenberg * otherwise. */ 1542dd4f699dSLars Ellenberg if (!can_do_reliable_discards(device)) 1543dd4f699dSLars Ellenberg peer_req->flags |= EE_IS_TRIM_USE_ZEROOUT; 1544dd4f699dSLars Ellenberg 1545dd4f699dSLars Ellenberg if (drbd_issue_discard_or_zero_out(device, peer_req->i.sector, 1546dd4f699dSLars Ellenberg peer_req->i.size >> 9, !(peer_req->flags & EE_IS_TRIM_USE_ZEROOUT))) 1547dd4f699dSLars Ellenberg peer_req->flags |= EE_WAS_ERROR; 1548dd4f699dSLars Ellenberg drbd_endio_write_sec_final(peer_req); 1549dd4f699dSLars Ellenberg } 1550dd4f699dSLars Ellenberg 15519104d31aSLars Ellenberg static void drbd_issue_peer_wsame(struct drbd_device *device, 15529104d31aSLars Ellenberg struct drbd_peer_request *peer_req) 15539104d31aSLars Ellenberg { 15549104d31aSLars Ellenberg struct block_device *bdev = device->ldev->backing_bdev; 15559104d31aSLars Ellenberg sector_t s = peer_req->i.sector; 15569104d31aSLars Ellenberg sector_t nr = peer_req->i.size >> 9; 15579104d31aSLars Ellenberg if (blkdev_issue_write_same(bdev, s, nr, GFP_NOIO, peer_req->pages)) 15589104d31aSLars Ellenberg peer_req->flags |= EE_WAS_ERROR; 15599104d31aSLars Ellenberg drbd_endio_write_sec_final(peer_req); 15609104d31aSLars Ellenberg } 15619104d31aSLars Ellenberg 15629104d31aSLars Ellenberg 1563b411b363SPhilipp Reisner /** 1564fbe29decSAndreas Gruenbacher * drbd_submit_peer_request() 1565b30ab791SAndreas Gruenbacher * @device: DRBD device. 1566db830c46SAndreas Gruenbacher * @peer_req: peer request 15671eff9d32SJens Axboe * @rw: flag field, see bio->bi_opf 156810f6d992SLars Ellenberg * 156910f6d992SLars Ellenberg * May spread the pages to multiple bios, 157010f6d992SLars Ellenberg * depending on bio_add_page restrictions. 157110f6d992SLars Ellenberg * 157210f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 157310f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 157410f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 157510f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 157610f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 157710f6d992SLars Ellenberg * on certain Xen deployments. 157845bb912bSLars Ellenberg */ 157945bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 1580b30ab791SAndreas Gruenbacher int drbd_submit_peer_request(struct drbd_device *device, 1581fbe29decSAndreas Gruenbacher struct drbd_peer_request *peer_req, 1582bb3cc85eSMike Christie const unsigned op, const unsigned op_flags, 1583bb3cc85eSMike Christie const int fault_type) 158445bb912bSLars Ellenberg { 158545bb912bSLars Ellenberg struct bio *bios = NULL; 158645bb912bSLars Ellenberg struct bio *bio; 1587db830c46SAndreas Gruenbacher struct page *page = peer_req->pages; 1588db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 158911f8b2b6SAndreas Gruenbacher unsigned data_size = peer_req->i.size; 159045bb912bSLars Ellenberg unsigned n_bios = 0; 159111f8b2b6SAndreas Gruenbacher unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; 159210f6d992SLars Ellenberg int err = -ENOMEM; 159345bb912bSLars Ellenberg 1594dd4f699dSLars Ellenberg /* TRIM/DISCARD: for now, always use the helper function 1595dd4f699dSLars Ellenberg * blkdev_issue_zeroout(..., discard=true). 1596dd4f699dSLars Ellenberg * It's synchronous, but it does the right thing wrt. bio splitting. 1597dd4f699dSLars Ellenberg * Correctness first, performance later. Next step is to code an 1598dd4f699dSLars Ellenberg * asynchronous variant of the same. 1599dd4f699dSLars Ellenberg */ 16009104d31aSLars Ellenberg if (peer_req->flags & (EE_IS_TRIM|EE_WRITE_SAME)) { 1601a0fb3c47SLars Ellenberg /* wait for all pending IO completions, before we start 1602a0fb3c47SLars Ellenberg * zeroing things out. */ 16035dd2ca19SAndreas Gruenbacher conn_wait_active_ee_empty(peer_req->peer_device->connection); 160445d2933cSLars Ellenberg /* add it to the active list now, 160545d2933cSLars Ellenberg * so we can find it to present it in debugfs */ 160621ae5d7fSLars Ellenberg peer_req->submit_jif = jiffies; 160721ae5d7fSLars Ellenberg peer_req->flags |= EE_SUBMITTED; 1608700ca8c0SPhilipp Reisner 1609700ca8c0SPhilipp Reisner /* If this was a resync request from receive_rs_deallocated(), 1610700ca8c0SPhilipp Reisner * it is already on the sync_ee list */ 1611700ca8c0SPhilipp Reisner if (list_empty(&peer_req->w.list)) { 161245d2933cSLars Ellenberg spin_lock_irq(&device->resource->req_lock); 161345d2933cSLars Ellenberg list_add_tail(&peer_req->w.list, &device->active_ee); 161445d2933cSLars Ellenberg spin_unlock_irq(&device->resource->req_lock); 1615700ca8c0SPhilipp Reisner } 1616700ca8c0SPhilipp Reisner 16179104d31aSLars Ellenberg if (peer_req->flags & EE_IS_TRIM) 1618dd4f699dSLars Ellenberg drbd_issue_peer_discard(device, peer_req); 16199104d31aSLars Ellenberg else /* EE_WRITE_SAME */ 16209104d31aSLars Ellenberg drbd_issue_peer_wsame(device, peer_req); 1621a0fb3c47SLars Ellenberg return 0; 1622a0fb3c47SLars Ellenberg } 1623a0fb3c47SLars Ellenberg 162445bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 162545bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 162645bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 16279476f39dSLars Ellenberg * request in more than one bio. 16289476f39dSLars Ellenberg * 16299476f39dSLars Ellenberg * Plain bio_alloc is good enough here, this is no DRBD internally 16309476f39dSLars Ellenberg * generated bio, but a bio allocated on behalf of the peer. 16319476f39dSLars Ellenberg */ 163245bb912bSLars Ellenberg next_bio: 163345bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 163445bb912bSLars Ellenberg if (!bio) { 1635a0fb3c47SLars Ellenberg drbd_err(device, "submit_ee: Allocation of a bio failed (nr_pages=%u)\n", nr_pages); 163645bb912bSLars Ellenberg goto fail; 163745bb912bSLars Ellenberg } 1638db830c46SAndreas Gruenbacher /* > peer_req->i.sector, unless this is the first bio */ 16394f024f37SKent Overstreet bio->bi_iter.bi_sector = sector; 1640b30ab791SAndreas Gruenbacher bio->bi_bdev = device->ldev->backing_bdev; 1641bb3cc85eSMike Christie bio_set_op_attrs(bio, op, op_flags); 1642db830c46SAndreas Gruenbacher bio->bi_private = peer_req; 1643fcefa62eSAndreas Gruenbacher bio->bi_end_io = drbd_peer_request_endio; 164445bb912bSLars Ellenberg 164545bb912bSLars Ellenberg bio->bi_next = bios; 164645bb912bSLars Ellenberg bios = bio; 164745bb912bSLars Ellenberg ++n_bios; 164845bb912bSLars Ellenberg 164945bb912bSLars Ellenberg page_chain_for_each(page) { 165011f8b2b6SAndreas Gruenbacher unsigned len = min_t(unsigned, data_size, PAGE_SIZE); 165106efffdaSMing Lei if (!bio_add_page(bio, page, len, 0)) 165245bb912bSLars Ellenberg goto next_bio; 165311f8b2b6SAndreas Gruenbacher data_size -= len; 165445bb912bSLars Ellenberg sector += len >> 9; 165545bb912bSLars Ellenberg --nr_pages; 165645bb912bSLars Ellenberg } 165711f8b2b6SAndreas Gruenbacher D_ASSERT(device, data_size == 0); 1658a0fb3c47SLars Ellenberg D_ASSERT(device, page == NULL); 165945bb912bSLars Ellenberg 1660db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, n_bios); 166121ae5d7fSLars Ellenberg /* for debugfs: update timestamp, mark as submitted */ 166221ae5d7fSLars Ellenberg peer_req->submit_jif = jiffies; 166321ae5d7fSLars Ellenberg peer_req->flags |= EE_SUBMITTED; 166445bb912bSLars Ellenberg do { 166545bb912bSLars Ellenberg bio = bios; 166645bb912bSLars Ellenberg bios = bios->bi_next; 166745bb912bSLars Ellenberg bio->bi_next = NULL; 166845bb912bSLars Ellenberg 1669b30ab791SAndreas Gruenbacher drbd_generic_make_request(device, fault_type, bio); 167045bb912bSLars Ellenberg } while (bios); 167145bb912bSLars Ellenberg return 0; 167245bb912bSLars Ellenberg 167345bb912bSLars Ellenberg fail: 167445bb912bSLars Ellenberg while (bios) { 167545bb912bSLars Ellenberg bio = bios; 167645bb912bSLars Ellenberg bios = bios->bi_next; 167745bb912bSLars Ellenberg bio_put(bio); 167845bb912bSLars Ellenberg } 167910f6d992SLars Ellenberg return err; 168045bb912bSLars Ellenberg } 168145bb912bSLars Ellenberg 1682b30ab791SAndreas Gruenbacher static void drbd_remove_epoch_entry_interval(struct drbd_device *device, 1683db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req) 168453840641SAndreas Gruenbacher { 1685db830c46SAndreas Gruenbacher struct drbd_interval *i = &peer_req->i; 168653840641SAndreas Gruenbacher 1687b30ab791SAndreas Gruenbacher drbd_remove_interval(&device->write_requests, i); 168853840641SAndreas Gruenbacher drbd_clear_interval(i); 168953840641SAndreas Gruenbacher 16906c852becSAndreas Gruenbacher /* Wake up any processes waiting for this peer request to complete. */ 169153840641SAndreas Gruenbacher if (i->waiting) 1692b30ab791SAndreas Gruenbacher wake_up(&device->misc_wait); 169353840641SAndreas Gruenbacher } 169453840641SAndreas Gruenbacher 1695bde89a9eSAndreas Gruenbacher static void conn_wait_active_ee_empty(struct drbd_connection *connection) 169677fede51SPhilipp Reisner { 1697c06ece6bSAndreas Gruenbacher struct drbd_peer_device *peer_device; 169877fede51SPhilipp Reisner int vnr; 169977fede51SPhilipp Reisner 170077fede51SPhilipp Reisner rcu_read_lock(); 1701c06ece6bSAndreas Gruenbacher idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { 1702c06ece6bSAndreas Gruenbacher struct drbd_device *device = peer_device->device; 1703c06ece6bSAndreas Gruenbacher 1704b30ab791SAndreas Gruenbacher kref_get(&device->kref); 170577fede51SPhilipp Reisner rcu_read_unlock(); 1706b30ab791SAndreas Gruenbacher drbd_wait_ee_list_empty(device, &device->active_ee); 170705a10ec7SAndreas Gruenbacher kref_put(&device->kref, drbd_destroy_device); 170877fede51SPhilipp Reisner rcu_read_lock(); 170977fede51SPhilipp Reisner } 171077fede51SPhilipp Reisner rcu_read_unlock(); 171177fede51SPhilipp Reisner } 171277fede51SPhilipp Reisner 1713bde89a9eSAndreas Gruenbacher static int receive_Barrier(struct drbd_connection *connection, struct packet_info *pi) 1714b411b363SPhilipp Reisner { 17152451fc3bSPhilipp Reisner int rv; 1716e658983aSAndreas Gruenbacher struct p_barrier *p = pi->data; 1717b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1718b411b363SPhilipp Reisner 17199ed57dcbSLars Ellenberg /* FIXME these are unacked on connection, 17209ed57dcbSLars Ellenberg * not a specific (peer)device. 17219ed57dcbSLars Ellenberg */ 1722bde89a9eSAndreas Gruenbacher connection->current_epoch->barrier_nr = p->barrier; 1723bde89a9eSAndreas Gruenbacher connection->current_epoch->connection = connection; 1724bde89a9eSAndreas Gruenbacher rv = drbd_may_finish_epoch(connection, connection->current_epoch, EV_GOT_BARRIER_NR); 1725b411b363SPhilipp Reisner 1726b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1727b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1728b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1729b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1730b411b363SPhilipp Reisner * completed. */ 1731e9526580SPhilipp Reisner switch (connection->resource->write_ordering) { 1732f6ba8636SAndreas Gruenbacher case WO_NONE: 1733b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 173482bc0194SAndreas Gruenbacher return 0; 1735b411b363SPhilipp Reisner 1736b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1737b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1738b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 17392451fc3bSPhilipp Reisner if (epoch) 17402451fc3bSPhilipp Reisner break; 17412451fc3bSPhilipp Reisner else 17421ec861ebSAndreas Gruenbacher drbd_warn(connection, "Allocation of an epoch failed, slowing down\n"); 17432451fc3bSPhilipp Reisner /* Fall through */ 17442451fc3bSPhilipp Reisner 1745f6ba8636SAndreas Gruenbacher case WO_BDEV_FLUSH: 1746f6ba8636SAndreas Gruenbacher case WO_DRAIN_IO: 1747bde89a9eSAndreas Gruenbacher conn_wait_active_ee_empty(connection); 1748bde89a9eSAndreas Gruenbacher drbd_flush(connection); 17492451fc3bSPhilipp Reisner 1750bde89a9eSAndreas Gruenbacher if (atomic_read(&connection->current_epoch->epoch_size)) { 17512451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 17522451fc3bSPhilipp Reisner if (epoch) 17532451fc3bSPhilipp Reisner break; 1754b411b363SPhilipp Reisner } 1755b411b363SPhilipp Reisner 175682bc0194SAndreas Gruenbacher return 0; 17572451fc3bSPhilipp Reisner default: 1758e9526580SPhilipp Reisner drbd_err(connection, "Strangeness in connection->write_ordering %d\n", 1759e9526580SPhilipp Reisner connection->resource->write_ordering); 176082bc0194SAndreas Gruenbacher return -EIO; 1761b411b363SPhilipp Reisner } 1762b411b363SPhilipp Reisner 1763b411b363SPhilipp Reisner epoch->flags = 0; 1764b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1765b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1766b411b363SPhilipp Reisner 1767bde89a9eSAndreas Gruenbacher spin_lock(&connection->epoch_lock); 1768bde89a9eSAndreas Gruenbacher if (atomic_read(&connection->current_epoch->epoch_size)) { 1769bde89a9eSAndreas Gruenbacher list_add(&epoch->list, &connection->current_epoch->list); 1770bde89a9eSAndreas Gruenbacher connection->current_epoch = epoch; 1771bde89a9eSAndreas Gruenbacher connection->epochs++; 1772b411b363SPhilipp Reisner } else { 1773b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1774b411b363SPhilipp Reisner kfree(epoch); 1775b411b363SPhilipp Reisner } 1776bde89a9eSAndreas Gruenbacher spin_unlock(&connection->epoch_lock); 1777b411b363SPhilipp Reisner 177882bc0194SAndreas Gruenbacher return 0; 1779b411b363SPhilipp Reisner } 1780b411b363SPhilipp Reisner 17819104d31aSLars Ellenberg /* quick wrapper in case payload size != request_size (write same) */ 17829104d31aSLars Ellenberg static void drbd_csum_ee_size(struct crypto_ahash *h, 17839104d31aSLars Ellenberg struct drbd_peer_request *r, void *d, 17849104d31aSLars Ellenberg unsigned int payload_size) 17859104d31aSLars Ellenberg { 17869104d31aSLars Ellenberg unsigned int tmp = r->i.size; 17879104d31aSLars Ellenberg r->i.size = payload_size; 17889104d31aSLars Ellenberg drbd_csum_ee(h, r, d); 17899104d31aSLars Ellenberg r->i.size = tmp; 17909104d31aSLars Ellenberg } 17919104d31aSLars Ellenberg 1792b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 17939104d31aSLars Ellenberg * and from receive_Data. 17949104d31aSLars Ellenberg * data_size: actual payload ("data in") 17959104d31aSLars Ellenberg * for normal writes that is bi_size. 17969104d31aSLars Ellenberg * for discards, that is zero. 17979104d31aSLars Ellenberg * for write same, it is logical_block_size. 17989104d31aSLars Ellenberg * both trim and write same have the bi_size ("data len to be affected") 17999104d31aSLars Ellenberg * as extra argument in the packet header. 18009104d31aSLars Ellenberg */ 1801f6ffca9fSAndreas Gruenbacher static struct drbd_peer_request * 180269a22773SAndreas Gruenbacher read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector, 1803a0fb3c47SLars Ellenberg struct packet_info *pi) __must_hold(local) 1804b411b363SPhilipp Reisner { 180569a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 1806b30ab791SAndreas Gruenbacher const sector_t capacity = drbd_get_capacity(device->this_bdev); 1807db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1808b411b363SPhilipp Reisner struct page *page; 180911f8b2b6SAndreas Gruenbacher int digest_size, err; 181011f8b2b6SAndreas Gruenbacher unsigned int data_size = pi->size, ds; 181169a22773SAndreas Gruenbacher void *dig_in = peer_device->connection->int_dig_in; 181269a22773SAndreas Gruenbacher void *dig_vv = peer_device->connection->int_dig_vv; 18136b4388acSPhilipp Reisner unsigned long *data; 1814a0fb3c47SLars Ellenberg struct p_trim *trim = (pi->cmd == P_TRIM) ? pi->data : NULL; 18159104d31aSLars Ellenberg struct p_trim *wsame = (pi->cmd == P_WSAME) ? pi->data : NULL; 1816b411b363SPhilipp Reisner 181711f8b2b6SAndreas Gruenbacher digest_size = 0; 1818a0fb3c47SLars Ellenberg if (!trim && peer_device->connection->peer_integrity_tfm) { 18199534d671SHerbert Xu digest_size = crypto_ahash_digestsize(peer_device->connection->peer_integrity_tfm); 18209f5bdc33SAndreas Gruenbacher /* 18219f5bdc33SAndreas Gruenbacher * FIXME: Receive the incoming digest into the receive buffer 18229f5bdc33SAndreas Gruenbacher * here, together with its struct p_data? 18239f5bdc33SAndreas Gruenbacher */ 182411f8b2b6SAndreas Gruenbacher err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size); 1825a5c31904SAndreas Gruenbacher if (err) 1826b411b363SPhilipp Reisner return NULL; 182711f8b2b6SAndreas Gruenbacher data_size -= digest_size; 182888104ca4SAndreas Gruenbacher } 1829b411b363SPhilipp Reisner 18309104d31aSLars Ellenberg /* assume request_size == data_size, but special case trim and wsame. */ 18319104d31aSLars Ellenberg ds = data_size; 1832a0fb3c47SLars Ellenberg if (trim) { 18339104d31aSLars Ellenberg if (!expect(data_size == 0)) 18349104d31aSLars Ellenberg return NULL; 18359104d31aSLars Ellenberg ds = be32_to_cpu(trim->size); 18369104d31aSLars Ellenberg } else if (wsame) { 18379104d31aSLars Ellenberg if (data_size != queue_logical_block_size(device->rq_queue)) { 18389104d31aSLars Ellenberg drbd_err(peer_device, "data size (%u) != drbd logical block size (%u)\n", 18399104d31aSLars Ellenberg data_size, queue_logical_block_size(device->rq_queue)); 18409104d31aSLars Ellenberg return NULL; 18419104d31aSLars Ellenberg } 18429104d31aSLars Ellenberg if (data_size != bdev_logical_block_size(device->ldev->backing_bdev)) { 18439104d31aSLars Ellenberg drbd_err(peer_device, "data size (%u) != backend logical block size (%u)\n", 18449104d31aSLars Ellenberg data_size, bdev_logical_block_size(device->ldev->backing_bdev)); 18459104d31aSLars Ellenberg return NULL; 18469104d31aSLars Ellenberg } 18479104d31aSLars Ellenberg ds = be32_to_cpu(wsame->size); 1848a0fb3c47SLars Ellenberg } 1849a0fb3c47SLars Ellenberg 18509104d31aSLars Ellenberg if (!expect(IS_ALIGNED(ds, 512))) 1851841ce241SAndreas Gruenbacher return NULL; 18529104d31aSLars Ellenberg if (trim || wsame) { 18539104d31aSLars Ellenberg if (!expect(ds <= (DRBD_MAX_BBIO_SECTORS << 9))) 18549104d31aSLars Ellenberg return NULL; 18559104d31aSLars Ellenberg } else if (!expect(ds <= DRBD_MAX_BIO_SIZE)) 1856841ce241SAndreas Gruenbacher return NULL; 1857b411b363SPhilipp Reisner 18586666032aSLars Ellenberg /* even though we trust out peer, 18596666032aSLars Ellenberg * we sometimes have to double check. */ 18609104d31aSLars Ellenberg if (sector + (ds>>9) > capacity) { 1861d0180171SAndreas Gruenbacher drbd_err(device, "request from peer beyond end of local disk: " 1862fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 18636666032aSLars Ellenberg (unsigned long long)capacity, 18649104d31aSLars Ellenberg (unsigned long long)sector, ds); 18656666032aSLars Ellenberg return NULL; 18666666032aSLars Ellenberg } 18676666032aSLars Ellenberg 1868b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1869b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1870b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 18719104d31aSLars Ellenberg peer_req = drbd_alloc_peer_req(peer_device, id, sector, ds, data_size, GFP_NOIO); 1872db830c46SAndreas Gruenbacher if (!peer_req) 1873b411b363SPhilipp Reisner return NULL; 187445bb912bSLars Ellenberg 187521ae5d7fSLars Ellenberg peer_req->flags |= EE_WRITE; 18769104d31aSLars Ellenberg if (trim) { 18779104d31aSLars Ellenberg peer_req->flags |= EE_IS_TRIM; 187881a3537aSLars Ellenberg return peer_req; 18799104d31aSLars Ellenberg } 18809104d31aSLars Ellenberg if (wsame) 18819104d31aSLars Ellenberg peer_req->flags |= EE_WRITE_SAME; 1882a73ff323SLars Ellenberg 18839104d31aSLars Ellenberg /* receive payload size bytes into page chain */ 1884b411b363SPhilipp Reisner ds = data_size; 1885db830c46SAndreas Gruenbacher page = peer_req->pages; 188645bb912bSLars Ellenberg page_chain_for_each(page) { 188745bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 18886b4388acSPhilipp Reisner data = kmap(page); 188969a22773SAndreas Gruenbacher err = drbd_recv_all_warn(peer_device->connection, data, len); 1890b30ab791SAndreas Gruenbacher if (drbd_insert_fault(device, DRBD_FAULT_RECEIVE)) { 1891d0180171SAndreas Gruenbacher drbd_err(device, "Fault injection: Corrupting data on receive\n"); 18926b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 18936b4388acSPhilipp Reisner } 1894b411b363SPhilipp Reisner kunmap(page); 1895a5c31904SAndreas Gruenbacher if (err) { 1896b30ab791SAndreas Gruenbacher drbd_free_peer_req(device, peer_req); 1897b411b363SPhilipp Reisner return NULL; 1898b411b363SPhilipp Reisner } 1899a5c31904SAndreas Gruenbacher ds -= len; 1900b411b363SPhilipp Reisner } 1901b411b363SPhilipp Reisner 190211f8b2b6SAndreas Gruenbacher if (digest_size) { 19039104d31aSLars Ellenberg drbd_csum_ee_size(peer_device->connection->peer_integrity_tfm, peer_req, dig_vv, data_size); 190411f8b2b6SAndreas Gruenbacher if (memcmp(dig_in, dig_vv, digest_size)) { 1905d0180171SAndreas Gruenbacher drbd_err(device, "Digest integrity check FAILED: %llus +%u\n", 1906470be44aSLars Ellenberg (unsigned long long)sector, data_size); 1907b30ab791SAndreas Gruenbacher drbd_free_peer_req(device, peer_req); 1908b411b363SPhilipp Reisner return NULL; 1909b411b363SPhilipp Reisner } 1910b411b363SPhilipp Reisner } 1911b30ab791SAndreas Gruenbacher device->recv_cnt += data_size >> 9; 1912db830c46SAndreas Gruenbacher return peer_req; 1913b411b363SPhilipp Reisner } 1914b411b363SPhilipp Reisner 1915b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1916b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1917b411b363SPhilipp Reisner */ 191869a22773SAndreas Gruenbacher static int drbd_drain_block(struct drbd_peer_device *peer_device, int data_size) 1919b411b363SPhilipp Reisner { 1920b411b363SPhilipp Reisner struct page *page; 1921a5c31904SAndreas Gruenbacher int err = 0; 1922b411b363SPhilipp Reisner void *data; 1923b411b363SPhilipp Reisner 1924c3470cdeSLars Ellenberg if (!data_size) 1925fc5be839SAndreas Gruenbacher return 0; 1926c3470cdeSLars Ellenberg 192769a22773SAndreas Gruenbacher page = drbd_alloc_pages(peer_device, 1, 1); 1928b411b363SPhilipp Reisner 1929b411b363SPhilipp Reisner data = kmap(page); 1930b411b363SPhilipp Reisner while (data_size) { 1931fc5be839SAndreas Gruenbacher unsigned int len = min_t(int, data_size, PAGE_SIZE); 1932fc5be839SAndreas Gruenbacher 193369a22773SAndreas Gruenbacher err = drbd_recv_all_warn(peer_device->connection, data, len); 1934a5c31904SAndreas Gruenbacher if (err) 1935b411b363SPhilipp Reisner break; 1936a5c31904SAndreas Gruenbacher data_size -= len; 1937b411b363SPhilipp Reisner } 1938b411b363SPhilipp Reisner kunmap(page); 193969a22773SAndreas Gruenbacher drbd_free_pages(peer_device->device, page, 0); 1940fc5be839SAndreas Gruenbacher return err; 1941b411b363SPhilipp Reisner } 1942b411b363SPhilipp Reisner 194369a22773SAndreas Gruenbacher static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_request *req, 1944b411b363SPhilipp Reisner sector_t sector, int data_size) 1945b411b363SPhilipp Reisner { 19467988613bSKent Overstreet struct bio_vec bvec; 19477988613bSKent Overstreet struct bvec_iter iter; 1948b411b363SPhilipp Reisner struct bio *bio; 194911f8b2b6SAndreas Gruenbacher int digest_size, err, expect; 195069a22773SAndreas Gruenbacher void *dig_in = peer_device->connection->int_dig_in; 195169a22773SAndreas Gruenbacher void *dig_vv = peer_device->connection->int_dig_vv; 1952b411b363SPhilipp Reisner 195311f8b2b6SAndreas Gruenbacher digest_size = 0; 195469a22773SAndreas Gruenbacher if (peer_device->connection->peer_integrity_tfm) { 19559534d671SHerbert Xu digest_size = crypto_ahash_digestsize(peer_device->connection->peer_integrity_tfm); 195611f8b2b6SAndreas Gruenbacher err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size); 1957a5c31904SAndreas Gruenbacher if (err) 1958a5c31904SAndreas Gruenbacher return err; 195911f8b2b6SAndreas Gruenbacher data_size -= digest_size; 196088104ca4SAndreas Gruenbacher } 1961b411b363SPhilipp Reisner 1962b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1963b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 196469a22773SAndreas Gruenbacher peer_device->device->recv_cnt += data_size>>9; 1965b411b363SPhilipp Reisner 1966b411b363SPhilipp Reisner bio = req->master_bio; 196769a22773SAndreas Gruenbacher D_ASSERT(peer_device->device, sector == bio->bi_iter.bi_sector); 1968b411b363SPhilipp Reisner 19697988613bSKent Overstreet bio_for_each_segment(bvec, bio, iter) { 19707988613bSKent Overstreet void *mapped = kmap(bvec.bv_page) + bvec.bv_offset; 19717988613bSKent Overstreet expect = min_t(int, data_size, bvec.bv_len); 197269a22773SAndreas Gruenbacher err = drbd_recv_all_warn(peer_device->connection, mapped, expect); 19737988613bSKent Overstreet kunmap(bvec.bv_page); 1974a5c31904SAndreas Gruenbacher if (err) 1975a5c31904SAndreas Gruenbacher return err; 1976a5c31904SAndreas Gruenbacher data_size -= expect; 1977b411b363SPhilipp Reisner } 1978b411b363SPhilipp Reisner 197911f8b2b6SAndreas Gruenbacher if (digest_size) { 198069a22773SAndreas Gruenbacher drbd_csum_bio(peer_device->connection->peer_integrity_tfm, bio, dig_vv); 198111f8b2b6SAndreas Gruenbacher if (memcmp(dig_in, dig_vv, digest_size)) { 198269a22773SAndreas Gruenbacher drbd_err(peer_device, "Digest integrity check FAILED. Broken NICs?\n"); 198328284cefSAndreas Gruenbacher return -EINVAL; 1984b411b363SPhilipp Reisner } 1985b411b363SPhilipp Reisner } 1986b411b363SPhilipp Reisner 198769a22773SAndreas Gruenbacher D_ASSERT(peer_device->device, data_size == 0); 198828284cefSAndreas Gruenbacher return 0; 1989b411b363SPhilipp Reisner } 1990b411b363SPhilipp Reisner 1991a990be46SAndreas Gruenbacher /* 1992668700b4SPhilipp Reisner * e_end_resync_block() is called in ack_sender context via 1993a990be46SAndreas Gruenbacher * drbd_finish_peer_reqs(). 1994a990be46SAndreas Gruenbacher */ 199599920dc5SAndreas Gruenbacher static int e_end_resync_block(struct drbd_work *w, int unused) 1996b411b363SPhilipp Reisner { 19978050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 1998a8cd15baSAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 1999a8cd15baSAndreas Gruenbacher struct drbd_peer_device *peer_device = peer_req->peer_device; 2000a8cd15baSAndreas Gruenbacher struct drbd_device *device = peer_device->device; 2001db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 200299920dc5SAndreas Gruenbacher int err; 2003b411b363SPhilipp Reisner 20040b0ba1efSAndreas Gruenbacher D_ASSERT(device, drbd_interval_empty(&peer_req->i)); 2005b411b363SPhilipp Reisner 2006db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 2007b30ab791SAndreas Gruenbacher drbd_set_in_sync(device, sector, peer_req->i.size); 2008a8cd15baSAndreas Gruenbacher err = drbd_send_ack(peer_device, P_RS_WRITE_ACK, peer_req); 2009b411b363SPhilipp Reisner } else { 2010b411b363SPhilipp Reisner /* Record failure to sync */ 2011b30ab791SAndreas Gruenbacher drbd_rs_failed_io(device, sector, peer_req->i.size); 2012b411b363SPhilipp Reisner 2013a8cd15baSAndreas Gruenbacher err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); 2014b411b363SPhilipp Reisner } 2015b30ab791SAndreas Gruenbacher dec_unacked(device); 2016b411b363SPhilipp Reisner 201799920dc5SAndreas Gruenbacher return err; 2018b411b363SPhilipp Reisner } 2019b411b363SPhilipp Reisner 202069a22773SAndreas Gruenbacher static int recv_resync_read(struct drbd_peer_device *peer_device, sector_t sector, 2021a0fb3c47SLars Ellenberg struct packet_info *pi) __releases(local) 2022b411b363SPhilipp Reisner { 202369a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 2024db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2025b411b363SPhilipp Reisner 2026a0fb3c47SLars Ellenberg peer_req = read_in_block(peer_device, ID_SYNCER, sector, pi); 2027db830c46SAndreas Gruenbacher if (!peer_req) 202845bb912bSLars Ellenberg goto fail; 2029b411b363SPhilipp Reisner 2030b30ab791SAndreas Gruenbacher dec_rs_pending(device); 2031b411b363SPhilipp Reisner 2032b30ab791SAndreas Gruenbacher inc_unacked(device); 2033b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 2034b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 2035b411b363SPhilipp Reisner 2036a8cd15baSAndreas Gruenbacher peer_req->w.cb = e_end_resync_block; 203721ae5d7fSLars Ellenberg peer_req->submit_jif = jiffies; 203845bb912bSLars Ellenberg 20390500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 2040b9ed7080SLars Ellenberg list_add_tail(&peer_req->w.list, &device->sync_ee); 20410500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 2042b411b363SPhilipp Reisner 2043a0fb3c47SLars Ellenberg atomic_add(pi->size >> 9, &device->rs_sect_ev); 2044bb3cc85eSMike Christie if (drbd_submit_peer_request(device, peer_req, REQ_OP_WRITE, 0, 2045bb3cc85eSMike Christie DRBD_FAULT_RS_WR) == 0) 2046e1c1b0fcSAndreas Gruenbacher return 0; 204745bb912bSLars Ellenberg 204810f6d992SLars Ellenberg /* don't care for the reason here */ 2049d0180171SAndreas Gruenbacher drbd_err(device, "submit failed, triggering re-connect\n"); 20500500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 2051a8cd15baSAndreas Gruenbacher list_del(&peer_req->w.list); 20520500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 205322cc37a9SLars Ellenberg 2054b30ab791SAndreas Gruenbacher drbd_free_peer_req(device, peer_req); 205545bb912bSLars Ellenberg fail: 2056b30ab791SAndreas Gruenbacher put_ldev(device); 2057e1c1b0fcSAndreas Gruenbacher return -EIO; 2058b411b363SPhilipp Reisner } 2059b411b363SPhilipp Reisner 2060668eebc6SAndreas Gruenbacher static struct drbd_request * 2061b30ab791SAndreas Gruenbacher find_request(struct drbd_device *device, struct rb_root *root, u64 id, 2062bc9c5c41SAndreas Gruenbacher sector_t sector, bool missing_ok, const char *func) 2063b411b363SPhilipp Reisner { 2064b411b363SPhilipp Reisner struct drbd_request *req; 2065668eebc6SAndreas Gruenbacher 2066bc9c5c41SAndreas Gruenbacher /* Request object according to our peer */ 2067bc9c5c41SAndreas Gruenbacher req = (struct drbd_request *)(unsigned long)id; 20685e472264SAndreas Gruenbacher if (drbd_contains_interval(root, sector, &req->i) && req->i.local) 2069668eebc6SAndreas Gruenbacher return req; 2070c3afd8f5SAndreas Gruenbacher if (!missing_ok) { 2071d0180171SAndreas Gruenbacher drbd_err(device, "%s: failed to find request 0x%lx, sector %llus\n", func, 2072c3afd8f5SAndreas Gruenbacher (unsigned long)id, (unsigned long long)sector); 2073c3afd8f5SAndreas Gruenbacher } 2074668eebc6SAndreas Gruenbacher return NULL; 2075668eebc6SAndreas Gruenbacher } 2076668eebc6SAndreas Gruenbacher 2077bde89a9eSAndreas Gruenbacher static int receive_DataReply(struct drbd_connection *connection, struct packet_info *pi) 2078b411b363SPhilipp Reisner { 20799f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 2080b30ab791SAndreas Gruenbacher struct drbd_device *device; 2081b411b363SPhilipp Reisner struct drbd_request *req; 2082b411b363SPhilipp Reisner sector_t sector; 208382bc0194SAndreas Gruenbacher int err; 2084e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 20854a76b161SAndreas Gruenbacher 20869f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 20879f4fe9adSAndreas Gruenbacher if (!peer_device) 20884a76b161SAndreas Gruenbacher return -EIO; 20899f4fe9adSAndreas Gruenbacher device = peer_device->device; 2090b411b363SPhilipp Reisner 2091b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2092b411b363SPhilipp Reisner 20930500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 2094b30ab791SAndreas Gruenbacher req = find_request(device, &device->read_requests, p->block_id, sector, false, __func__); 20950500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 2096c3afd8f5SAndreas Gruenbacher if (unlikely(!req)) 209782bc0194SAndreas Gruenbacher return -EIO; 2098b411b363SPhilipp Reisner 209924c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 2100b411b363SPhilipp Reisner * special casing it there for the various failure cases. 2101b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 210269a22773SAndreas Gruenbacher err = recv_dless_read(peer_device, req, sector, pi->size); 210382bc0194SAndreas Gruenbacher if (!err) 21048554df1cSAndreas Gruenbacher req_mod(req, DATA_RECEIVED); 2105b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 2106b411b363SPhilipp Reisner * I don't think we may complete this just yet 2107b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 2108b411b363SPhilipp Reisner 210982bc0194SAndreas Gruenbacher return err; 2110b411b363SPhilipp Reisner } 2111b411b363SPhilipp Reisner 2112bde89a9eSAndreas Gruenbacher static int receive_RSDataReply(struct drbd_connection *connection, struct packet_info *pi) 2113b411b363SPhilipp Reisner { 21149f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 2115b30ab791SAndreas Gruenbacher struct drbd_device *device; 2116b411b363SPhilipp Reisner sector_t sector; 211782bc0194SAndreas Gruenbacher int err; 2118e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 21194a76b161SAndreas Gruenbacher 21209f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 21219f4fe9adSAndreas Gruenbacher if (!peer_device) 21224a76b161SAndreas Gruenbacher return -EIO; 21239f4fe9adSAndreas Gruenbacher device = peer_device->device; 2124b411b363SPhilipp Reisner 2125b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 21260b0ba1efSAndreas Gruenbacher D_ASSERT(device, p->block_id == ID_SYNCER); 2127b411b363SPhilipp Reisner 2128b30ab791SAndreas Gruenbacher if (get_ldev(device)) { 2129b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 2130b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 2131fcefa62eSAndreas Gruenbacher * or in drbd_peer_request_endio. */ 2132a0fb3c47SLars Ellenberg err = recv_resync_read(peer_device, sector, pi); 2133b411b363SPhilipp Reisner } else { 2134b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 2135d0180171SAndreas Gruenbacher drbd_err(device, "Can not write resync data to local disk.\n"); 2136b411b363SPhilipp Reisner 213769a22773SAndreas Gruenbacher err = drbd_drain_block(peer_device, pi->size); 2138b411b363SPhilipp Reisner 213969a22773SAndreas Gruenbacher drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); 2140b411b363SPhilipp Reisner } 2141b411b363SPhilipp Reisner 2142b30ab791SAndreas Gruenbacher atomic_add(pi->size >> 9, &device->rs_sect_in); 2143778f271dSPhilipp Reisner 214482bc0194SAndreas Gruenbacher return err; 2145b411b363SPhilipp Reisner } 2146b411b363SPhilipp Reisner 2147b30ab791SAndreas Gruenbacher static void restart_conflicting_writes(struct drbd_device *device, 21487be8da07SAndreas Gruenbacher sector_t sector, int size) 2149b411b363SPhilipp Reisner { 21507be8da07SAndreas Gruenbacher struct drbd_interval *i; 21517be8da07SAndreas Gruenbacher struct drbd_request *req; 2152b411b363SPhilipp Reisner 2153b30ab791SAndreas Gruenbacher drbd_for_each_overlap(i, &device->write_requests, sector, size) { 21547be8da07SAndreas Gruenbacher if (!i->local) 21557be8da07SAndreas Gruenbacher continue; 21567be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 21577be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 21587be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) 21597be8da07SAndreas Gruenbacher continue; 21602312f0b3SLars Ellenberg /* as it is RQ_POSTPONED, this will cause it to 21612312f0b3SLars Ellenberg * be queued on the retry workqueue. */ 2162d4dabbe2SLars Ellenberg __req_mod(req, CONFLICT_RESOLVED, NULL); 21637be8da07SAndreas Gruenbacher } 21647be8da07SAndreas Gruenbacher } 21657be8da07SAndreas Gruenbacher 2166a990be46SAndreas Gruenbacher /* 2167668700b4SPhilipp Reisner * e_end_block() is called in ack_sender context via drbd_finish_peer_reqs(). 2168b411b363SPhilipp Reisner */ 216999920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *w, int cancel) 2170b411b363SPhilipp Reisner { 21718050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 2172a8cd15baSAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 2173a8cd15baSAndreas Gruenbacher struct drbd_peer_device *peer_device = peer_req->peer_device; 2174a8cd15baSAndreas Gruenbacher struct drbd_device *device = peer_device->device; 2175db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 217699920dc5SAndreas Gruenbacher int err = 0, pcmd; 2177b411b363SPhilipp Reisner 2178303d1448SPhilipp Reisner if (peer_req->flags & EE_SEND_WRITE_ACK) { 2179db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 2180b30ab791SAndreas Gruenbacher pcmd = (device->state.conn >= C_SYNC_SOURCE && 2181b30ab791SAndreas Gruenbacher device->state.conn <= C_PAUSED_SYNC_T && 2182db830c46SAndreas Gruenbacher peer_req->flags & EE_MAY_SET_IN_SYNC) ? 2183b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 2184a8cd15baSAndreas Gruenbacher err = drbd_send_ack(peer_device, pcmd, peer_req); 2185b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 2186b30ab791SAndreas Gruenbacher drbd_set_in_sync(device, sector, peer_req->i.size); 2187b411b363SPhilipp Reisner } else { 2188a8cd15baSAndreas Gruenbacher err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); 2189b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 2190b411b363SPhilipp Reisner * maybe assert this? */ 2191b411b363SPhilipp Reisner } 2192b30ab791SAndreas Gruenbacher dec_unacked(device); 2193b411b363SPhilipp Reisner } 219408d0dabfSLars Ellenberg 2195b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 2196b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 2197302bdeaeSPhilipp Reisner if (peer_req->flags & EE_IN_INTERVAL_TREE) { 21980500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 21990b0ba1efSAndreas Gruenbacher D_ASSERT(device, !drbd_interval_empty(&peer_req->i)); 2200b30ab791SAndreas Gruenbacher drbd_remove_epoch_entry_interval(device, peer_req); 22017be8da07SAndreas Gruenbacher if (peer_req->flags & EE_RESTART_REQUESTS) 2202b30ab791SAndreas Gruenbacher restart_conflicting_writes(device, sector, peer_req->i.size); 22030500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 2204bb3bfe96SAndreas Gruenbacher } else 22050b0ba1efSAndreas Gruenbacher D_ASSERT(device, drbd_interval_empty(&peer_req->i)); 2206b411b363SPhilipp Reisner 22075dd2ca19SAndreas Gruenbacher drbd_may_finish_epoch(peer_device->connection, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 2208b411b363SPhilipp Reisner 220999920dc5SAndreas Gruenbacher return err; 2210b411b363SPhilipp Reisner } 2211b411b363SPhilipp Reisner 2212a8cd15baSAndreas Gruenbacher static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) 2213b411b363SPhilipp Reisner { 22148050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 2215a8cd15baSAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 2216a8cd15baSAndreas Gruenbacher struct drbd_peer_device *peer_device = peer_req->peer_device; 221799920dc5SAndreas Gruenbacher int err; 2218b411b363SPhilipp Reisner 2219a8cd15baSAndreas Gruenbacher err = drbd_send_ack(peer_device, ack, peer_req); 2220a8cd15baSAndreas Gruenbacher dec_unacked(peer_device->device); 2221b411b363SPhilipp Reisner 222299920dc5SAndreas Gruenbacher return err; 2223b411b363SPhilipp Reisner } 2224b411b363SPhilipp Reisner 2225d4dabbe2SLars Ellenberg static int e_send_superseded(struct drbd_work *w, int unused) 2226b6a370baSPhilipp Reisner { 2227a8cd15baSAndreas Gruenbacher return e_send_ack(w, P_SUPERSEDED); 22287be8da07SAndreas Gruenbacher } 2229b6a370baSPhilipp Reisner 223099920dc5SAndreas Gruenbacher static int e_send_retry_write(struct drbd_work *w, int unused) 22317be8da07SAndreas Gruenbacher { 2232a8cd15baSAndreas Gruenbacher struct drbd_peer_request *peer_req = 2233a8cd15baSAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 2234a8cd15baSAndreas Gruenbacher struct drbd_connection *connection = peer_req->peer_device->connection; 22357be8da07SAndreas Gruenbacher 2236a8cd15baSAndreas Gruenbacher return e_send_ack(w, connection->agreed_pro_version >= 100 ? 2237d4dabbe2SLars Ellenberg P_RETRY_WRITE : P_SUPERSEDED); 22387be8da07SAndreas Gruenbacher } 22397be8da07SAndreas Gruenbacher 22403e394da1SAndreas Gruenbacher static bool seq_greater(u32 a, u32 b) 22413e394da1SAndreas Gruenbacher { 22423e394da1SAndreas Gruenbacher /* 22433e394da1SAndreas Gruenbacher * We assume 32-bit wrap-around here. 22443e394da1SAndreas Gruenbacher * For 24-bit wrap-around, we would have to shift: 22453e394da1SAndreas Gruenbacher * a <<= 8; b <<= 8; 22463e394da1SAndreas Gruenbacher */ 22473e394da1SAndreas Gruenbacher return (s32)a - (s32)b > 0; 22483e394da1SAndreas Gruenbacher } 22493e394da1SAndreas Gruenbacher 22503e394da1SAndreas Gruenbacher static u32 seq_max(u32 a, u32 b) 22513e394da1SAndreas Gruenbacher { 22523e394da1SAndreas Gruenbacher return seq_greater(a, b) ? a : b; 22533e394da1SAndreas Gruenbacher } 22543e394da1SAndreas Gruenbacher 225569a22773SAndreas Gruenbacher static void update_peer_seq(struct drbd_peer_device *peer_device, unsigned int peer_seq) 22563e394da1SAndreas Gruenbacher { 225769a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 22583c13b680SLars Ellenberg unsigned int newest_peer_seq; 22593e394da1SAndreas Gruenbacher 226069a22773SAndreas Gruenbacher if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) { 2261b30ab791SAndreas Gruenbacher spin_lock(&device->peer_seq_lock); 2262b30ab791SAndreas Gruenbacher newest_peer_seq = seq_max(device->peer_seq, peer_seq); 2263b30ab791SAndreas Gruenbacher device->peer_seq = newest_peer_seq; 2264b30ab791SAndreas Gruenbacher spin_unlock(&device->peer_seq_lock); 2265b30ab791SAndreas Gruenbacher /* wake up only if we actually changed device->peer_seq */ 22663c13b680SLars Ellenberg if (peer_seq == newest_peer_seq) 2267b30ab791SAndreas Gruenbacher wake_up(&device->seq_wait); 22683e394da1SAndreas Gruenbacher } 22697be8da07SAndreas Gruenbacher } 22703e394da1SAndreas Gruenbacher 2271d93f6302SLars Ellenberg static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2) 2272d93f6302SLars Ellenberg { 2273d93f6302SLars Ellenberg return !((s1 + (l1>>9) <= s2) || (s1 >= s2 + (l2>>9))); 2274d93f6302SLars Ellenberg } 2275d93f6302SLars Ellenberg 2276d93f6302SLars Ellenberg /* maybe change sync_ee into interval trees as well? */ 2277b30ab791SAndreas Gruenbacher static bool overlapping_resync_write(struct drbd_device *device, struct drbd_peer_request *peer_req) 2278d93f6302SLars Ellenberg { 2279d93f6302SLars Ellenberg struct drbd_peer_request *rs_req; 22807e5fec31SFabian Frederick bool rv = false; 2281b6a370baSPhilipp Reisner 22820500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 2283a8cd15baSAndreas Gruenbacher list_for_each_entry(rs_req, &device->sync_ee, w.list) { 2284d93f6302SLars Ellenberg if (overlaps(peer_req->i.sector, peer_req->i.size, 2285d93f6302SLars Ellenberg rs_req->i.sector, rs_req->i.size)) { 22867e5fec31SFabian Frederick rv = true; 2287b6a370baSPhilipp Reisner break; 2288b6a370baSPhilipp Reisner } 2289b6a370baSPhilipp Reisner } 22900500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 2291b6a370baSPhilipp Reisner 2292b6a370baSPhilipp Reisner return rv; 2293b6a370baSPhilipp Reisner } 2294b6a370baSPhilipp Reisner 2295b411b363SPhilipp Reisner /* Called from receive_Data. 2296b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 2297b411b363SPhilipp Reisner * 2298b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 2299b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 2300b411b363SPhilipp Reisner * been sent. 2301b411b363SPhilipp Reisner * 2302b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 2303b411b363SPhilipp Reisner * 2304b30ab791SAndreas Gruenbacher * In case packet_seq is larger than device->peer_seq number, there are 2305b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 2306b30ab791SAndreas Gruenbacher * In case we are the logically next packet, we update device->peer_seq 2307b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 2308b411b363SPhilipp Reisner * 2309b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 2310b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 2311b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 2312b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 2313b411b363SPhilipp Reisner * 2314b411b363SPhilipp Reisner * returns 0 if we may process the packet, 2315b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 231669a22773SAndreas Gruenbacher static int wait_for_and_update_peer_seq(struct drbd_peer_device *peer_device, const u32 peer_seq) 2317b411b363SPhilipp Reisner { 231869a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 2319b411b363SPhilipp Reisner DEFINE_WAIT(wait); 2320b411b363SPhilipp Reisner long timeout; 2321b874d231SPhilipp Reisner int ret = 0, tp; 23227be8da07SAndreas Gruenbacher 232369a22773SAndreas Gruenbacher if (!test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) 23247be8da07SAndreas Gruenbacher return 0; 23257be8da07SAndreas Gruenbacher 2326b30ab791SAndreas Gruenbacher spin_lock(&device->peer_seq_lock); 2327b411b363SPhilipp Reisner for (;;) { 2328b30ab791SAndreas Gruenbacher if (!seq_greater(peer_seq - 1, device->peer_seq)) { 2329b30ab791SAndreas Gruenbacher device->peer_seq = seq_max(device->peer_seq, peer_seq); 2330b411b363SPhilipp Reisner break; 23317be8da07SAndreas Gruenbacher } 2332b874d231SPhilipp Reisner 2333b411b363SPhilipp Reisner if (signal_pending(current)) { 2334b411b363SPhilipp Reisner ret = -ERESTARTSYS; 2335b411b363SPhilipp Reisner break; 2336b411b363SPhilipp Reisner } 2337b874d231SPhilipp Reisner 2338b874d231SPhilipp Reisner rcu_read_lock(); 23395dd2ca19SAndreas Gruenbacher tp = rcu_dereference(peer_device->connection->net_conf)->two_primaries; 2340b874d231SPhilipp Reisner rcu_read_unlock(); 2341b874d231SPhilipp Reisner 2342b874d231SPhilipp Reisner if (!tp) 2343b874d231SPhilipp Reisner break; 2344b874d231SPhilipp Reisner 2345b874d231SPhilipp Reisner /* Only need to wait if two_primaries is enabled */ 2346b30ab791SAndreas Gruenbacher prepare_to_wait(&device->seq_wait, &wait, TASK_INTERRUPTIBLE); 2347b30ab791SAndreas Gruenbacher spin_unlock(&device->peer_seq_lock); 234844ed167dSPhilipp Reisner rcu_read_lock(); 234969a22773SAndreas Gruenbacher timeout = rcu_dereference(peer_device->connection->net_conf)->ping_timeo*HZ/10; 235044ed167dSPhilipp Reisner rcu_read_unlock(); 235171b1c1ebSAndreas Gruenbacher timeout = schedule_timeout(timeout); 2352b30ab791SAndreas Gruenbacher spin_lock(&device->peer_seq_lock); 23537be8da07SAndreas Gruenbacher if (!timeout) { 2354b411b363SPhilipp Reisner ret = -ETIMEDOUT; 2355d0180171SAndreas Gruenbacher drbd_err(device, "Timed out waiting for missing ack packets; disconnecting\n"); 2356b411b363SPhilipp Reisner break; 2357b411b363SPhilipp Reisner } 2358b411b363SPhilipp Reisner } 2359b30ab791SAndreas Gruenbacher spin_unlock(&device->peer_seq_lock); 2360b30ab791SAndreas Gruenbacher finish_wait(&device->seq_wait, &wait); 2361b411b363SPhilipp Reisner return ret; 2362b411b363SPhilipp Reisner } 2363b411b363SPhilipp Reisner 2364688593c5SLars Ellenberg /* see also bio_flags_to_wire() 2365688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 2366688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 2367bb3cc85eSMike Christie static unsigned long wire_flags_to_bio_flags(u32 dpf) 236876d2e7ecSPhilipp Reisner { 236976d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 237076d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 237128a8f0d3SMike Christie (dpf & DP_FLUSH ? REQ_PREFLUSH : 0); 2372bb3cc85eSMike Christie } 2373bb3cc85eSMike Christie 2374bb3cc85eSMike Christie static unsigned long wire_flags_to_bio_op(u32 dpf) 2375bb3cc85eSMike Christie { 2376bb3cc85eSMike Christie if (dpf & DP_DISCARD) 2377bb3cc85eSMike Christie return REQ_OP_DISCARD; 2378bb3cc85eSMike Christie else 2379bb3cc85eSMike Christie return REQ_OP_WRITE; 238076d2e7ecSPhilipp Reisner } 238176d2e7ecSPhilipp Reisner 2382b30ab791SAndreas Gruenbacher static void fail_postponed_requests(struct drbd_device *device, sector_t sector, 23837be8da07SAndreas Gruenbacher unsigned int size) 2384b411b363SPhilipp Reisner { 23857be8da07SAndreas Gruenbacher struct drbd_interval *i; 23867be8da07SAndreas Gruenbacher 23877be8da07SAndreas Gruenbacher repeat: 2388b30ab791SAndreas Gruenbacher drbd_for_each_overlap(i, &device->write_requests, sector, size) { 23897be8da07SAndreas Gruenbacher struct drbd_request *req; 23907be8da07SAndreas Gruenbacher struct bio_and_error m; 23917be8da07SAndreas Gruenbacher 23927be8da07SAndreas Gruenbacher if (!i->local) 23937be8da07SAndreas Gruenbacher continue; 23947be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 23957be8da07SAndreas Gruenbacher if (!(req->rq_state & RQ_POSTPONED)) 23967be8da07SAndreas Gruenbacher continue; 23977be8da07SAndreas Gruenbacher req->rq_state &= ~RQ_POSTPONED; 23987be8da07SAndreas Gruenbacher __req_mod(req, NEG_ACKED, &m); 23990500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 24007be8da07SAndreas Gruenbacher if (m.bio) 2401b30ab791SAndreas Gruenbacher complete_master_bio(device, &m); 24020500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 24037be8da07SAndreas Gruenbacher goto repeat; 24047be8da07SAndreas Gruenbacher } 24057be8da07SAndreas Gruenbacher } 24067be8da07SAndreas Gruenbacher 2407b30ab791SAndreas Gruenbacher static int handle_write_conflicts(struct drbd_device *device, 24087be8da07SAndreas Gruenbacher struct drbd_peer_request *peer_req) 24097be8da07SAndreas Gruenbacher { 2410e33b32deSAndreas Gruenbacher struct drbd_connection *connection = peer_req->peer_device->connection; 2411bde89a9eSAndreas Gruenbacher bool resolve_conflicts = test_bit(RESOLVE_CONFLICTS, &connection->flags); 24127be8da07SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 24137be8da07SAndreas Gruenbacher const unsigned int size = peer_req->i.size; 24147be8da07SAndreas Gruenbacher struct drbd_interval *i; 24157be8da07SAndreas Gruenbacher bool equal; 24167be8da07SAndreas Gruenbacher int err; 24177be8da07SAndreas Gruenbacher 24187be8da07SAndreas Gruenbacher /* 24197be8da07SAndreas Gruenbacher * Inserting the peer request into the write_requests tree will prevent 24207be8da07SAndreas Gruenbacher * new conflicting local requests from being added. 24217be8da07SAndreas Gruenbacher */ 2422b30ab791SAndreas Gruenbacher drbd_insert_interval(&device->write_requests, &peer_req->i); 24237be8da07SAndreas Gruenbacher 24247be8da07SAndreas Gruenbacher repeat: 2425b30ab791SAndreas Gruenbacher drbd_for_each_overlap(i, &device->write_requests, sector, size) { 24267be8da07SAndreas Gruenbacher if (i == &peer_req->i) 24277be8da07SAndreas Gruenbacher continue; 242808d0dabfSLars Ellenberg if (i->completed) 242908d0dabfSLars Ellenberg continue; 24307be8da07SAndreas Gruenbacher 24317be8da07SAndreas Gruenbacher if (!i->local) { 24327be8da07SAndreas Gruenbacher /* 24337be8da07SAndreas Gruenbacher * Our peer has sent a conflicting remote request; this 24347be8da07SAndreas Gruenbacher * should not happen in a two-node setup. Wait for the 24357be8da07SAndreas Gruenbacher * earlier peer request to complete. 24367be8da07SAndreas Gruenbacher */ 2437b30ab791SAndreas Gruenbacher err = drbd_wait_misc(device, i); 24387be8da07SAndreas Gruenbacher if (err) 24397be8da07SAndreas Gruenbacher goto out; 24407be8da07SAndreas Gruenbacher goto repeat; 24417be8da07SAndreas Gruenbacher } 24427be8da07SAndreas Gruenbacher 24437be8da07SAndreas Gruenbacher equal = i->sector == sector && i->size == size; 24447be8da07SAndreas Gruenbacher if (resolve_conflicts) { 24457be8da07SAndreas Gruenbacher /* 24467be8da07SAndreas Gruenbacher * If the peer request is fully contained within the 2447d4dabbe2SLars Ellenberg * overlapping request, it can be considered overwritten 2448d4dabbe2SLars Ellenberg * and thus superseded; otherwise, it will be retried 2449d4dabbe2SLars Ellenberg * once all overlapping requests have completed. 24507be8da07SAndreas Gruenbacher */ 2451d4dabbe2SLars Ellenberg bool superseded = i->sector <= sector && i->sector + 24527be8da07SAndreas Gruenbacher (i->size >> 9) >= sector + (size >> 9); 24537be8da07SAndreas Gruenbacher 24547be8da07SAndreas Gruenbacher if (!equal) 2455d0180171SAndreas Gruenbacher drbd_alert(device, "Concurrent writes detected: " 24567be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u, " 24577be8da07SAndreas Gruenbacher "assuming %s came first\n", 24587be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 24597be8da07SAndreas Gruenbacher (unsigned long long)sector, size, 2460d4dabbe2SLars Ellenberg superseded ? "local" : "remote"); 24617be8da07SAndreas Gruenbacher 2462a8cd15baSAndreas Gruenbacher peer_req->w.cb = superseded ? e_send_superseded : 24637be8da07SAndreas Gruenbacher e_send_retry_write; 2464a8cd15baSAndreas Gruenbacher list_add_tail(&peer_req->w.list, &device->done_ee); 2465668700b4SPhilipp Reisner queue_work(connection->ack_sender, &peer_req->peer_device->send_acks_work); 24667be8da07SAndreas Gruenbacher 24677be8da07SAndreas Gruenbacher err = -ENOENT; 24687be8da07SAndreas Gruenbacher goto out; 24697be8da07SAndreas Gruenbacher } else { 24707be8da07SAndreas Gruenbacher struct drbd_request *req = 24717be8da07SAndreas Gruenbacher container_of(i, struct drbd_request, i); 24727be8da07SAndreas Gruenbacher 24737be8da07SAndreas Gruenbacher if (!equal) 2474d0180171SAndreas Gruenbacher drbd_alert(device, "Concurrent writes detected: " 24757be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u\n", 24767be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 24777be8da07SAndreas Gruenbacher (unsigned long long)sector, size); 24787be8da07SAndreas Gruenbacher 24797be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 24807be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) { 24817be8da07SAndreas Gruenbacher /* 24827be8da07SAndreas Gruenbacher * Wait for the node with the discard flag to 2483d4dabbe2SLars Ellenberg * decide if this request has been superseded 2484d4dabbe2SLars Ellenberg * or needs to be retried. 2485d4dabbe2SLars Ellenberg * Requests that have been superseded will 24867be8da07SAndreas Gruenbacher * disappear from the write_requests tree. 24877be8da07SAndreas Gruenbacher * 24887be8da07SAndreas Gruenbacher * In addition, wait for the conflicting 24897be8da07SAndreas Gruenbacher * request to finish locally before submitting 24907be8da07SAndreas Gruenbacher * the conflicting peer request. 24917be8da07SAndreas Gruenbacher */ 2492b30ab791SAndreas Gruenbacher err = drbd_wait_misc(device, &req->i); 24937be8da07SAndreas Gruenbacher if (err) { 2494e33b32deSAndreas Gruenbacher _conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD); 2495b30ab791SAndreas Gruenbacher fail_postponed_requests(device, sector, size); 24967be8da07SAndreas Gruenbacher goto out; 24977be8da07SAndreas Gruenbacher } 24987be8da07SAndreas Gruenbacher goto repeat; 24997be8da07SAndreas Gruenbacher } 25007be8da07SAndreas Gruenbacher /* 25017be8da07SAndreas Gruenbacher * Remember to restart the conflicting requests after 25027be8da07SAndreas Gruenbacher * the new peer request has completed. 25037be8da07SAndreas Gruenbacher */ 25047be8da07SAndreas Gruenbacher peer_req->flags |= EE_RESTART_REQUESTS; 25057be8da07SAndreas Gruenbacher } 25067be8da07SAndreas Gruenbacher } 25077be8da07SAndreas Gruenbacher err = 0; 25087be8da07SAndreas Gruenbacher 25097be8da07SAndreas Gruenbacher out: 25107be8da07SAndreas Gruenbacher if (err) 2511b30ab791SAndreas Gruenbacher drbd_remove_epoch_entry_interval(device, peer_req); 25127be8da07SAndreas Gruenbacher return err; 25137be8da07SAndreas Gruenbacher } 25147be8da07SAndreas Gruenbacher 2515b411b363SPhilipp Reisner /* mirrored write */ 2516bde89a9eSAndreas Gruenbacher static int receive_Data(struct drbd_connection *connection, struct packet_info *pi) 2517b411b363SPhilipp Reisner { 25189f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 2519b30ab791SAndreas Gruenbacher struct drbd_device *device; 252021ae5d7fSLars Ellenberg struct net_conf *nc; 2521b411b363SPhilipp Reisner sector_t sector; 2522db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2523e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 25247be8da07SAndreas Gruenbacher u32 peer_seq = be32_to_cpu(p->seq_num); 2525bb3cc85eSMike Christie int op, op_flags; 2526b411b363SPhilipp Reisner u32 dp_flags; 2527302bdeaeSPhilipp Reisner int err, tp; 25287be8da07SAndreas Gruenbacher 25299f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 25309f4fe9adSAndreas Gruenbacher if (!peer_device) 25314a76b161SAndreas Gruenbacher return -EIO; 25329f4fe9adSAndreas Gruenbacher device = peer_device->device; 2533b411b363SPhilipp Reisner 2534b30ab791SAndreas Gruenbacher if (!get_ldev(device)) { 253582bc0194SAndreas Gruenbacher int err2; 2536b411b363SPhilipp Reisner 253769a22773SAndreas Gruenbacher err = wait_for_and_update_peer_seq(peer_device, peer_seq); 253869a22773SAndreas Gruenbacher drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); 2539bde89a9eSAndreas Gruenbacher atomic_inc(&connection->current_epoch->epoch_size); 254069a22773SAndreas Gruenbacher err2 = drbd_drain_block(peer_device, pi->size); 254182bc0194SAndreas Gruenbacher if (!err) 254282bc0194SAndreas Gruenbacher err = err2; 254382bc0194SAndreas Gruenbacher return err; 2544b411b363SPhilipp Reisner } 2545b411b363SPhilipp Reisner 2546fcefa62eSAndreas Gruenbacher /* 2547fcefa62eSAndreas Gruenbacher * Corresponding put_ldev done either below (on various errors), or in 2548fcefa62eSAndreas Gruenbacher * drbd_peer_request_endio, if we successfully submit the data at the 2549fcefa62eSAndreas Gruenbacher * end of this function. 2550fcefa62eSAndreas Gruenbacher */ 2551b411b363SPhilipp Reisner 2552b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2553a0fb3c47SLars Ellenberg peer_req = read_in_block(peer_device, p->block_id, sector, pi); 2554db830c46SAndreas Gruenbacher if (!peer_req) { 2555b30ab791SAndreas Gruenbacher put_ldev(device); 255682bc0194SAndreas Gruenbacher return -EIO; 2557b411b363SPhilipp Reisner } 2558b411b363SPhilipp Reisner 2559a8cd15baSAndreas Gruenbacher peer_req->w.cb = e_end_block; 256021ae5d7fSLars Ellenberg peer_req->submit_jif = jiffies; 256121ae5d7fSLars Ellenberg peer_req->flags |= EE_APPLICATION; 2562b411b363SPhilipp Reisner 2563688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 2564bb3cc85eSMike Christie op = wire_flags_to_bio_op(dp_flags); 2565bb3cc85eSMike Christie op_flags = wire_flags_to_bio_flags(dp_flags); 2566a0fb3c47SLars Ellenberg if (pi->cmd == P_TRIM) { 2567a0fb3c47SLars Ellenberg D_ASSERT(peer_device, peer_req->i.size > 0); 2568bb3cc85eSMike Christie D_ASSERT(peer_device, op == REQ_OP_DISCARD); 2569a0fb3c47SLars Ellenberg D_ASSERT(peer_device, peer_req->pages == NULL); 2570a0fb3c47SLars Ellenberg } else if (peer_req->pages == NULL) { 25710b0ba1efSAndreas Gruenbacher D_ASSERT(device, peer_req->i.size == 0); 25720b0ba1efSAndreas Gruenbacher D_ASSERT(device, dp_flags & DP_FLUSH); 2573a73ff323SLars Ellenberg } 2574688593c5SLars Ellenberg 2575688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 2576db830c46SAndreas Gruenbacher peer_req->flags |= EE_MAY_SET_IN_SYNC; 2577688593c5SLars Ellenberg 2578bde89a9eSAndreas Gruenbacher spin_lock(&connection->epoch_lock); 2579bde89a9eSAndreas Gruenbacher peer_req->epoch = connection->current_epoch; 2580db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->epoch_size); 2581db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->active); 2582bde89a9eSAndreas Gruenbacher spin_unlock(&connection->epoch_lock); 2583b411b363SPhilipp Reisner 2584302bdeaeSPhilipp Reisner rcu_read_lock(); 258521ae5d7fSLars Ellenberg nc = rcu_dereference(peer_device->connection->net_conf); 258621ae5d7fSLars Ellenberg tp = nc->two_primaries; 258721ae5d7fSLars Ellenberg if (peer_device->connection->agreed_pro_version < 100) { 258821ae5d7fSLars Ellenberg switch (nc->wire_protocol) { 258921ae5d7fSLars Ellenberg case DRBD_PROT_C: 259021ae5d7fSLars Ellenberg dp_flags |= DP_SEND_WRITE_ACK; 259121ae5d7fSLars Ellenberg break; 259221ae5d7fSLars Ellenberg case DRBD_PROT_B: 259321ae5d7fSLars Ellenberg dp_flags |= DP_SEND_RECEIVE_ACK; 259421ae5d7fSLars Ellenberg break; 259521ae5d7fSLars Ellenberg } 259621ae5d7fSLars Ellenberg } 2597302bdeaeSPhilipp Reisner rcu_read_unlock(); 259821ae5d7fSLars Ellenberg 259921ae5d7fSLars Ellenberg if (dp_flags & DP_SEND_WRITE_ACK) { 260021ae5d7fSLars Ellenberg peer_req->flags |= EE_SEND_WRITE_ACK; 260121ae5d7fSLars Ellenberg inc_unacked(device); 260221ae5d7fSLars Ellenberg /* corresponding dec_unacked() in e_end_block() 260321ae5d7fSLars Ellenberg * respective _drbd_clear_done_ee */ 260421ae5d7fSLars Ellenberg } 260521ae5d7fSLars Ellenberg 260621ae5d7fSLars Ellenberg if (dp_flags & DP_SEND_RECEIVE_ACK) { 260721ae5d7fSLars Ellenberg /* I really don't like it that the receiver thread 260821ae5d7fSLars Ellenberg * sends on the msock, but anyways */ 26095dd2ca19SAndreas Gruenbacher drbd_send_ack(peer_device, P_RECV_ACK, peer_req); 261021ae5d7fSLars Ellenberg } 261121ae5d7fSLars Ellenberg 2612302bdeaeSPhilipp Reisner if (tp) { 261321ae5d7fSLars Ellenberg /* two primaries implies protocol C */ 261421ae5d7fSLars Ellenberg D_ASSERT(device, dp_flags & DP_SEND_WRITE_ACK); 2615302bdeaeSPhilipp Reisner peer_req->flags |= EE_IN_INTERVAL_TREE; 261669a22773SAndreas Gruenbacher err = wait_for_and_update_peer_seq(peer_device, peer_seq); 26177be8da07SAndreas Gruenbacher if (err) 2618b411b363SPhilipp Reisner goto out_interrupted; 26190500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 2620b30ab791SAndreas Gruenbacher err = handle_write_conflicts(device, peer_req); 26217be8da07SAndreas Gruenbacher if (err) { 26220500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 26237be8da07SAndreas Gruenbacher if (err == -ENOENT) { 2624b30ab791SAndreas Gruenbacher put_ldev(device); 262582bc0194SAndreas Gruenbacher return 0; 2626b411b363SPhilipp Reisner } 2627b411b363SPhilipp Reisner goto out_interrupted; 2628b411b363SPhilipp Reisner } 2629b874d231SPhilipp Reisner } else { 263069a22773SAndreas Gruenbacher update_peer_seq(peer_device, peer_seq); 26310500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 2632b874d231SPhilipp Reisner } 26339104d31aSLars Ellenberg /* TRIM and WRITE_SAME are processed synchronously, 26349104d31aSLars Ellenberg * we wait for all pending requests, respectively wait for 2635a0fb3c47SLars Ellenberg * active_ee to become empty in drbd_submit_peer_request(); 2636a0fb3c47SLars Ellenberg * better not add ourselves here. */ 26379104d31aSLars Ellenberg if ((peer_req->flags & (EE_IS_TRIM|EE_WRITE_SAME)) == 0) 2638b9ed7080SLars Ellenberg list_add_tail(&peer_req->w.list, &device->active_ee); 26390500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 2640b411b363SPhilipp Reisner 2641b30ab791SAndreas Gruenbacher if (device->state.conn == C_SYNC_TARGET) 2642b30ab791SAndreas Gruenbacher wait_event(device->ee_wait, !overlapping_resync_write(device, peer_req)); 2643b6a370baSPhilipp Reisner 2644b30ab791SAndreas Gruenbacher if (device->state.pdsk < D_INCONSISTENT) { 2645b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 2646b30ab791SAndreas Gruenbacher drbd_set_out_of_sync(device, peer_req->i.sector, peer_req->i.size); 2647db830c46SAndreas Gruenbacher peer_req->flags &= ~EE_MAY_SET_IN_SYNC; 26484dd726f0SLars Ellenberg drbd_al_begin_io(device, &peer_req->i); 264921ae5d7fSLars Ellenberg peer_req->flags |= EE_CALL_AL_COMPLETE_IO; 2650b411b363SPhilipp Reisner } 2651b411b363SPhilipp Reisner 2652bb3cc85eSMike Christie err = drbd_submit_peer_request(device, peer_req, op, op_flags, 2653bb3cc85eSMike Christie DRBD_FAULT_DT_WR); 265482bc0194SAndreas Gruenbacher if (!err) 265582bc0194SAndreas Gruenbacher return 0; 2656b411b363SPhilipp Reisner 265710f6d992SLars Ellenberg /* don't care for the reason here */ 2658d0180171SAndreas Gruenbacher drbd_err(device, "submit failed, triggering re-connect\n"); 26590500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 2660a8cd15baSAndreas Gruenbacher list_del(&peer_req->w.list); 2661b30ab791SAndreas Gruenbacher drbd_remove_epoch_entry_interval(device, peer_req); 26620500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 266321ae5d7fSLars Ellenberg if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) { 266421ae5d7fSLars Ellenberg peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; 2665b30ab791SAndreas Gruenbacher drbd_al_complete_io(device, &peer_req->i); 266621ae5d7fSLars Ellenberg } 266722cc37a9SLars Ellenberg 2668b411b363SPhilipp Reisner out_interrupted: 26697e5fec31SFabian Frederick drbd_may_finish_epoch(connection, peer_req->epoch, EV_PUT | EV_CLEANUP); 2670b30ab791SAndreas Gruenbacher put_ldev(device); 2671b30ab791SAndreas Gruenbacher drbd_free_peer_req(device, peer_req); 267282bc0194SAndreas Gruenbacher return err; 2673b411b363SPhilipp Reisner } 2674b411b363SPhilipp Reisner 26750f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 26760f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 26770f0601f4SLars Ellenberg * 26780f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 26790f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 26800f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 26810f0601f4SLars Ellenberg * activity, it obviously is "busy". 26820f0601f4SLars Ellenberg * 26830f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 26840f0601f4SLars Ellenberg * to have a short time average so we can react faster. 26850f0601f4SLars Ellenberg */ 2686ad3fee79SLars Ellenberg bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector, 2687ad3fee79SLars Ellenberg bool throttle_if_app_is_waiting) 2688e8299874SLars Ellenberg { 2689e8299874SLars Ellenberg struct lc_element *tmp; 2690ad3fee79SLars Ellenberg bool throttle = drbd_rs_c_min_rate_throttle(device); 2691e8299874SLars Ellenberg 2692ad3fee79SLars Ellenberg if (!throttle || throttle_if_app_is_waiting) 2693ad3fee79SLars Ellenberg return throttle; 2694e8299874SLars Ellenberg 2695e8299874SLars Ellenberg spin_lock_irq(&device->al_lock); 2696e8299874SLars Ellenberg tmp = lc_find(device->resync, BM_SECT_TO_EXT(sector)); 2697e8299874SLars Ellenberg if (tmp) { 2698e8299874SLars Ellenberg struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 2699e8299874SLars Ellenberg if (test_bit(BME_PRIORITY, &bm_ext->flags)) 2700e8299874SLars Ellenberg throttle = false; 2701ad3fee79SLars Ellenberg /* Do not slow down if app IO is already waiting for this extent, 2702ad3fee79SLars Ellenberg * and our progress is necessary for application IO to complete. */ 2703e8299874SLars Ellenberg } 2704e8299874SLars Ellenberg spin_unlock_irq(&device->al_lock); 2705e8299874SLars Ellenberg 2706e8299874SLars Ellenberg return throttle; 2707e8299874SLars Ellenberg } 2708e8299874SLars Ellenberg 2709e8299874SLars Ellenberg bool drbd_rs_c_min_rate_throttle(struct drbd_device *device) 27100f0601f4SLars Ellenberg { 2711b30ab791SAndreas Gruenbacher struct gendisk *disk = device->ldev->backing_bdev->bd_contains->bd_disk; 27120f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 2713daeda1ccSPhilipp Reisner unsigned int c_min_rate; 2714e8299874SLars Ellenberg int curr_events; 2715daeda1ccSPhilipp Reisner 2716daeda1ccSPhilipp Reisner rcu_read_lock(); 2717b30ab791SAndreas Gruenbacher c_min_rate = rcu_dereference(device->ldev->disk_conf)->c_min_rate; 2718daeda1ccSPhilipp Reisner rcu_read_unlock(); 27190f0601f4SLars Ellenberg 27200f0601f4SLars Ellenberg /* feature disabled? */ 2721daeda1ccSPhilipp Reisner if (c_min_rate == 0) 2722e8299874SLars Ellenberg return false; 2723e3555d85SPhilipp Reisner 27240f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 27250f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 2726b30ab791SAndreas Gruenbacher atomic_read(&device->rs_sect_ev); 2727ad3fee79SLars Ellenberg 2728ad3fee79SLars Ellenberg if (atomic_read(&device->ap_actlog_cnt) 2729ff8bd88bSLars Ellenberg || curr_events - device->rs_last_events > 64) { 27300f0601f4SLars Ellenberg unsigned long rs_left; 27310f0601f4SLars Ellenberg int i; 27320f0601f4SLars Ellenberg 2733b30ab791SAndreas Gruenbacher device->rs_last_events = curr_events; 27340f0601f4SLars Ellenberg 27350f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 27360f0601f4SLars Ellenberg * approx. */ 2737b30ab791SAndreas Gruenbacher i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 27382649f080SLars Ellenberg 2739b30ab791SAndreas Gruenbacher if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) 2740b30ab791SAndreas Gruenbacher rs_left = device->ov_left; 27412649f080SLars Ellenberg else 2742b30ab791SAndreas Gruenbacher rs_left = drbd_bm_total_weight(device) - device->rs_failed; 27430f0601f4SLars Ellenberg 2744b30ab791SAndreas Gruenbacher dt = ((long)jiffies - (long)device->rs_mark_time[i]) / HZ; 27450f0601f4SLars Ellenberg if (!dt) 27460f0601f4SLars Ellenberg dt++; 2747b30ab791SAndreas Gruenbacher db = device->rs_mark_left[i] - rs_left; 27480f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 27490f0601f4SLars Ellenberg 2750daeda1ccSPhilipp Reisner if (dbdt > c_min_rate) 2751e8299874SLars Ellenberg return true; 27520f0601f4SLars Ellenberg } 2753e8299874SLars Ellenberg return false; 27540f0601f4SLars Ellenberg } 27550f0601f4SLars Ellenberg 2756bde89a9eSAndreas Gruenbacher static int receive_DataRequest(struct drbd_connection *connection, struct packet_info *pi) 2757b411b363SPhilipp Reisner { 27589f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 2759b30ab791SAndreas Gruenbacher struct drbd_device *device; 2760b411b363SPhilipp Reisner sector_t sector; 27614a76b161SAndreas Gruenbacher sector_t capacity; 2762db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2763b411b363SPhilipp Reisner struct digest_info *di = NULL; 2764b18b37beSPhilipp Reisner int size, verb; 2765b411b363SPhilipp Reisner unsigned int fault_type; 2766e658983aSAndreas Gruenbacher struct p_block_req *p = pi->data; 27674a76b161SAndreas Gruenbacher 27689f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 27699f4fe9adSAndreas Gruenbacher if (!peer_device) 27704a76b161SAndreas Gruenbacher return -EIO; 27719f4fe9adSAndreas Gruenbacher device = peer_device->device; 2772b30ab791SAndreas Gruenbacher capacity = drbd_get_capacity(device->this_bdev); 2773b411b363SPhilipp Reisner 2774b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2775b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2776b411b363SPhilipp Reisner 2777c670a398SAndreas Gruenbacher if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { 2778d0180171SAndreas Gruenbacher drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2779b411b363SPhilipp Reisner (unsigned long long)sector, size); 278082bc0194SAndreas Gruenbacher return -EINVAL; 2781b411b363SPhilipp Reisner } 2782b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 2783d0180171SAndreas Gruenbacher drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2784b411b363SPhilipp Reisner (unsigned long long)sector, size); 278582bc0194SAndreas Gruenbacher return -EINVAL; 2786b411b363SPhilipp Reisner } 2787b411b363SPhilipp Reisner 2788b30ab791SAndreas Gruenbacher if (!get_ldev_if_state(device, D_UP_TO_DATE)) { 2789b18b37beSPhilipp Reisner verb = 1; 2790e2857216SAndreas Gruenbacher switch (pi->cmd) { 2791b18b37beSPhilipp Reisner case P_DATA_REQUEST: 279269a22773SAndreas Gruenbacher drbd_send_ack_rp(peer_device, P_NEG_DREPLY, p); 2793b18b37beSPhilipp Reisner break; 2794700ca8c0SPhilipp Reisner case P_RS_THIN_REQ: 2795b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2796b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2797b18b37beSPhilipp Reisner case P_OV_REQUEST: 279869a22773SAndreas Gruenbacher drbd_send_ack_rp(peer_device, P_NEG_RS_DREPLY , p); 2799b18b37beSPhilipp Reisner break; 2800b18b37beSPhilipp Reisner case P_OV_REPLY: 2801b18b37beSPhilipp Reisner verb = 0; 2802b30ab791SAndreas Gruenbacher dec_rs_pending(device); 280369a22773SAndreas Gruenbacher drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, size, ID_IN_SYNC); 2804b18b37beSPhilipp Reisner break; 2805b18b37beSPhilipp Reisner default: 280649ba9b1bSAndreas Gruenbacher BUG(); 2807b18b37beSPhilipp Reisner } 2808b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2809d0180171SAndreas Gruenbacher drbd_err(device, "Can not satisfy peer's read request, " 2810b411b363SPhilipp Reisner "no local data.\n"); 2811b18b37beSPhilipp Reisner 2812a821cc4aSLars Ellenberg /* drain possibly payload */ 281369a22773SAndreas Gruenbacher return drbd_drain_block(peer_device, pi->size); 2814b411b363SPhilipp Reisner } 2815b411b363SPhilipp Reisner 2816b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2817b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2818b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 2819a0fb3c47SLars Ellenberg peer_req = drbd_alloc_peer_req(peer_device, p->block_id, sector, size, 28209104d31aSLars Ellenberg size, GFP_NOIO); 2821db830c46SAndreas Gruenbacher if (!peer_req) { 2822b30ab791SAndreas Gruenbacher put_ldev(device); 282382bc0194SAndreas Gruenbacher return -ENOMEM; 2824b411b363SPhilipp Reisner } 2825b411b363SPhilipp Reisner 2826e2857216SAndreas Gruenbacher switch (pi->cmd) { 2827b411b363SPhilipp Reisner case P_DATA_REQUEST: 2828a8cd15baSAndreas Gruenbacher peer_req->w.cb = w_e_end_data_req; 2829b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 283080a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 283121ae5d7fSLars Ellenberg peer_req->flags |= EE_APPLICATION; 283280a40e43SLars Ellenberg goto submit; 283380a40e43SLars Ellenberg 2834700ca8c0SPhilipp Reisner case P_RS_THIN_REQ: 2835700ca8c0SPhilipp Reisner /* If at some point in the future we have a smart way to 2836700ca8c0SPhilipp Reisner find out if this data block is completely deallocated, 2837700ca8c0SPhilipp Reisner then we would do something smarter here than reading 2838700ca8c0SPhilipp Reisner the block... */ 2839700ca8c0SPhilipp Reisner peer_req->flags |= EE_RS_THIN_REQ; 2840b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2841a8cd15baSAndreas Gruenbacher peer_req->w.cb = w_e_end_rsdata_req; 2842b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 28435f9915bbSLars Ellenberg /* used in the sector offset progress display */ 2844b30ab791SAndreas Gruenbacher device->bm_resync_fo = BM_SECT_TO_BIT(sector); 2845b411b363SPhilipp Reisner break; 2846b411b363SPhilipp Reisner 2847b411b363SPhilipp Reisner case P_OV_REPLY: 2848b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2849b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2850e2857216SAndreas Gruenbacher di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); 2851b411b363SPhilipp Reisner if (!di) 2852b411b363SPhilipp Reisner goto out_free_e; 2853b411b363SPhilipp Reisner 2854e2857216SAndreas Gruenbacher di->digest_size = pi->size; 2855b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2856b411b363SPhilipp Reisner 2857db830c46SAndreas Gruenbacher peer_req->digest = di; 2858db830c46SAndreas Gruenbacher peer_req->flags |= EE_HAS_DIGEST; 2859c36c3cedSLars Ellenberg 28609f4fe9adSAndreas Gruenbacher if (drbd_recv_all(peer_device->connection, di->digest, pi->size)) 2861b411b363SPhilipp Reisner goto out_free_e; 2862b411b363SPhilipp Reisner 2863e2857216SAndreas Gruenbacher if (pi->cmd == P_CSUM_RS_REQUEST) { 28649f4fe9adSAndreas Gruenbacher D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); 2865a8cd15baSAndreas Gruenbacher peer_req->w.cb = w_e_end_csum_rs_req; 28665f9915bbSLars Ellenberg /* used in the sector offset progress display */ 2867b30ab791SAndreas Gruenbacher device->bm_resync_fo = BM_SECT_TO_BIT(sector); 2868aaaba345SLars Ellenberg /* remember to report stats in drbd_resync_finished */ 2869aaaba345SLars Ellenberg device->use_csums = true; 2870e2857216SAndreas Gruenbacher } else if (pi->cmd == P_OV_REPLY) { 28712649f080SLars Ellenberg /* track progress, we may need to throttle */ 2872b30ab791SAndreas Gruenbacher atomic_add(size >> 9, &device->rs_sect_in); 2873a8cd15baSAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_reply; 2874b30ab791SAndreas Gruenbacher dec_rs_pending(device); 28750f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 28760f0601f4SLars Ellenberg * but accounting still needs to be done. */ 28770f0601f4SLars Ellenberg goto submit_for_resync; 2878b411b363SPhilipp Reisner } 2879b411b363SPhilipp Reisner break; 2880b411b363SPhilipp Reisner 2881b411b363SPhilipp Reisner case P_OV_REQUEST: 2882b30ab791SAndreas Gruenbacher if (device->ov_start_sector == ~(sector_t)0 && 28839f4fe9adSAndreas Gruenbacher peer_device->connection->agreed_pro_version >= 90) { 2884de228bbaSLars Ellenberg unsigned long now = jiffies; 2885de228bbaSLars Ellenberg int i; 2886b30ab791SAndreas Gruenbacher device->ov_start_sector = sector; 2887b30ab791SAndreas Gruenbacher device->ov_position = sector; 2888b30ab791SAndreas Gruenbacher device->ov_left = drbd_bm_bits(device) - BM_SECT_TO_BIT(sector); 2889b30ab791SAndreas Gruenbacher device->rs_total = device->ov_left; 2890de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2891b30ab791SAndreas Gruenbacher device->rs_mark_left[i] = device->ov_left; 2892b30ab791SAndreas Gruenbacher device->rs_mark_time[i] = now; 2893de228bbaSLars Ellenberg } 2894d0180171SAndreas Gruenbacher drbd_info(device, "Online Verify start sector: %llu\n", 2895b411b363SPhilipp Reisner (unsigned long long)sector); 2896b411b363SPhilipp Reisner } 2897a8cd15baSAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_req; 2898b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2899b411b363SPhilipp Reisner break; 2900b411b363SPhilipp Reisner 2901b411b363SPhilipp Reisner default: 290249ba9b1bSAndreas Gruenbacher BUG(); 2903b411b363SPhilipp Reisner } 2904b411b363SPhilipp Reisner 29050f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 29060f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 29070f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 29080f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 29090f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 29100f0601f4SLars Ellenberg * 29110f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 29120f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 29130f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 29140f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 29150f0601f4SLars Ellenberg * a while, anyways. 29160f0601f4SLars Ellenberg */ 2917b411b363SPhilipp Reisner 29180f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 29190f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 29200f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 29210f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 29220f0601f4SLars Ellenberg * 29230f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 29240f0601f4SLars Ellenberg * we would also throttle its application reads. 29250f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 29260f0601f4SLars Ellenberg */ 2927c5a2c150SLars Ellenberg 2928c5a2c150SLars Ellenberg /* Even though this may be a resync request, we do add to "read_ee"; 2929c5a2c150SLars Ellenberg * "sync_ee" is only used for resync WRITEs. 2930c5a2c150SLars Ellenberg * Add to list early, so debugfs can find this request 2931c5a2c150SLars Ellenberg * even if we have to sleep below. */ 2932c5a2c150SLars Ellenberg spin_lock_irq(&device->resource->req_lock); 2933c5a2c150SLars Ellenberg list_add_tail(&peer_req->w.list, &device->read_ee); 2934c5a2c150SLars Ellenberg spin_unlock_irq(&device->resource->req_lock); 2935c5a2c150SLars Ellenberg 2936944410e9SLars Ellenberg update_receiver_timing_details(connection, drbd_rs_should_slow_down); 2937ad3fee79SLars Ellenberg if (device->state.peer != R_PRIMARY 2938ad3fee79SLars Ellenberg && drbd_rs_should_slow_down(device, sector, false)) 2939e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2940944410e9SLars Ellenberg update_receiver_timing_details(connection, drbd_rs_begin_io); 2941b30ab791SAndreas Gruenbacher if (drbd_rs_begin_io(device, sector)) 294280a40e43SLars Ellenberg goto out_free_e; 2943b411b363SPhilipp Reisner 29440f0601f4SLars Ellenberg submit_for_resync: 2945b30ab791SAndreas Gruenbacher atomic_add(size >> 9, &device->rs_sect_ev); 29460f0601f4SLars Ellenberg 294780a40e43SLars Ellenberg submit: 2948944410e9SLars Ellenberg update_receiver_timing_details(connection, drbd_submit_peer_request); 2949b30ab791SAndreas Gruenbacher inc_unacked(device); 2950bb3cc85eSMike Christie if (drbd_submit_peer_request(device, peer_req, REQ_OP_READ, 0, 2951bb3cc85eSMike Christie fault_type) == 0) 295282bc0194SAndreas Gruenbacher return 0; 2953b411b363SPhilipp Reisner 295410f6d992SLars Ellenberg /* don't care for the reason here */ 2955d0180171SAndreas Gruenbacher drbd_err(device, "submit failed, triggering re-connect\n"); 2956c5a2c150SLars Ellenberg 2957c5a2c150SLars Ellenberg out_free_e: 29580500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 2959a8cd15baSAndreas Gruenbacher list_del(&peer_req->w.list); 29600500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 296122cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 296222cc37a9SLars Ellenberg 2963b30ab791SAndreas Gruenbacher put_ldev(device); 2964b30ab791SAndreas Gruenbacher drbd_free_peer_req(device, peer_req); 296582bc0194SAndreas Gruenbacher return -EIO; 2966b411b363SPhilipp Reisner } 2967b411b363SPhilipp Reisner 296869a22773SAndreas Gruenbacher /** 296969a22773SAndreas Gruenbacher * drbd_asb_recover_0p - Recover after split-brain with no remaining primaries 297069a22773SAndreas Gruenbacher */ 297169a22773SAndreas Gruenbacher static int drbd_asb_recover_0p(struct drbd_peer_device *peer_device) __must_hold(local) 2972b411b363SPhilipp Reisner { 297369a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 2974b411b363SPhilipp Reisner int self, peer, rv = -100; 2975b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 297644ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_0p; 2977b411b363SPhilipp Reisner 2978b30ab791SAndreas Gruenbacher self = device->ldev->md.uuid[UI_BITMAP] & 1; 2979b30ab791SAndreas Gruenbacher peer = device->p_uuid[UI_BITMAP] & 1; 2980b411b363SPhilipp Reisner 2981b30ab791SAndreas Gruenbacher ch_peer = device->p_uuid[UI_SIZE]; 2982b30ab791SAndreas Gruenbacher ch_self = device->comm_bm_set; 2983b411b363SPhilipp Reisner 298444ed167dSPhilipp Reisner rcu_read_lock(); 298569a22773SAndreas Gruenbacher after_sb_0p = rcu_dereference(peer_device->connection->net_conf)->after_sb_0p; 298644ed167dSPhilipp Reisner rcu_read_unlock(); 298744ed167dSPhilipp Reisner switch (after_sb_0p) { 2988b411b363SPhilipp Reisner case ASB_CONSENSUS: 2989b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2990b411b363SPhilipp Reisner case ASB_CALL_HELPER: 299144ed167dSPhilipp Reisner case ASB_VIOLENTLY: 2992d0180171SAndreas Gruenbacher drbd_err(device, "Configuration error.\n"); 2993b411b363SPhilipp Reisner break; 2994b411b363SPhilipp Reisner case ASB_DISCONNECT: 2995b411b363SPhilipp Reisner break; 2996b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2997b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2998b411b363SPhilipp Reisner rv = -1; 2999b411b363SPhilipp Reisner break; 3000b411b363SPhilipp Reisner } 3001b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 3002b411b363SPhilipp Reisner rv = 1; 3003b411b363SPhilipp Reisner break; 3004b411b363SPhilipp Reisner } 3005b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 3006b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 3007b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 3008b411b363SPhilipp Reisner rv = 1; 3009b411b363SPhilipp Reisner break; 3010b411b363SPhilipp Reisner } 3011b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 3012b411b363SPhilipp Reisner rv = -1; 3013b411b363SPhilipp Reisner break; 3014b411b363SPhilipp Reisner } 3015b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 3016d0180171SAndreas Gruenbacher drbd_warn(device, "Discard younger/older primary did not find a decision\n" 3017b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 3018b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 3019b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 302069a22773SAndreas Gruenbacher rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) 3021b411b363SPhilipp Reisner ? -1 : 1; 3022b411b363SPhilipp Reisner break; 3023b411b363SPhilipp Reisner } else { 3024b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 3025b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 3026b411b363SPhilipp Reisner } 302744ed167dSPhilipp Reisner if (after_sb_0p == ASB_DISCARD_ZERO_CHG) 3028b411b363SPhilipp Reisner break; 3029b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 3030b411b363SPhilipp Reisner if (ch_self < ch_peer) 3031b411b363SPhilipp Reisner rv = -1; 3032b411b363SPhilipp Reisner else if (ch_self > ch_peer) 3033b411b363SPhilipp Reisner rv = 1; 3034b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 3035b411b363SPhilipp Reisner /* Well, then use something else. */ 303669a22773SAndreas Gruenbacher rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) 3037b411b363SPhilipp Reisner ? -1 : 1; 3038b411b363SPhilipp Reisner break; 3039b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 3040b411b363SPhilipp Reisner rv = -1; 3041b411b363SPhilipp Reisner break; 3042b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 3043b411b363SPhilipp Reisner rv = 1; 3044b411b363SPhilipp Reisner } 3045b411b363SPhilipp Reisner 3046b411b363SPhilipp Reisner return rv; 3047b411b363SPhilipp Reisner } 3048b411b363SPhilipp Reisner 304969a22773SAndreas Gruenbacher /** 305069a22773SAndreas Gruenbacher * drbd_asb_recover_1p - Recover after split-brain with one remaining primary 305169a22773SAndreas Gruenbacher */ 305269a22773SAndreas Gruenbacher static int drbd_asb_recover_1p(struct drbd_peer_device *peer_device) __must_hold(local) 3053b411b363SPhilipp Reisner { 305469a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 30556184ea21SAndreas Gruenbacher int hg, rv = -100; 305644ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_1p; 3057b411b363SPhilipp Reisner 305844ed167dSPhilipp Reisner rcu_read_lock(); 305969a22773SAndreas Gruenbacher after_sb_1p = rcu_dereference(peer_device->connection->net_conf)->after_sb_1p; 306044ed167dSPhilipp Reisner rcu_read_unlock(); 306144ed167dSPhilipp Reisner switch (after_sb_1p) { 3062b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 3063b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 3064b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 3065b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 3066b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 306744ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 3068d0180171SAndreas Gruenbacher drbd_err(device, "Configuration error.\n"); 3069b411b363SPhilipp Reisner break; 3070b411b363SPhilipp Reisner case ASB_DISCONNECT: 3071b411b363SPhilipp Reisner break; 3072b411b363SPhilipp Reisner case ASB_CONSENSUS: 307369a22773SAndreas Gruenbacher hg = drbd_asb_recover_0p(peer_device); 3074b30ab791SAndreas Gruenbacher if (hg == -1 && device->state.role == R_SECONDARY) 3075b411b363SPhilipp Reisner rv = hg; 3076b30ab791SAndreas Gruenbacher if (hg == 1 && device->state.role == R_PRIMARY) 3077b411b363SPhilipp Reisner rv = hg; 3078b411b363SPhilipp Reisner break; 3079b411b363SPhilipp Reisner case ASB_VIOLENTLY: 308069a22773SAndreas Gruenbacher rv = drbd_asb_recover_0p(peer_device); 3081b411b363SPhilipp Reisner break; 3082b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 3083b30ab791SAndreas Gruenbacher return device->state.role == R_PRIMARY ? 1 : -1; 3084b411b363SPhilipp Reisner case ASB_CALL_HELPER: 308569a22773SAndreas Gruenbacher hg = drbd_asb_recover_0p(peer_device); 3086b30ab791SAndreas Gruenbacher if (hg == -1 && device->state.role == R_PRIMARY) { 3087bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 3088bb437946SAndreas Gruenbacher 3089b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 3090b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 3091b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 3092b30ab791SAndreas Gruenbacher rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); 3093bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 3094b30ab791SAndreas Gruenbacher drbd_khelper(device, "pri-lost-after-sb"); 3095b411b363SPhilipp Reisner } else { 3096d0180171SAndreas Gruenbacher drbd_warn(device, "Successfully gave up primary role.\n"); 3097b411b363SPhilipp Reisner rv = hg; 3098b411b363SPhilipp Reisner } 3099b411b363SPhilipp Reisner } else 3100b411b363SPhilipp Reisner rv = hg; 3101b411b363SPhilipp Reisner } 3102b411b363SPhilipp Reisner 3103b411b363SPhilipp Reisner return rv; 3104b411b363SPhilipp Reisner } 3105b411b363SPhilipp Reisner 310669a22773SAndreas Gruenbacher /** 310769a22773SAndreas Gruenbacher * drbd_asb_recover_2p - Recover after split-brain with two remaining primaries 310869a22773SAndreas Gruenbacher */ 310969a22773SAndreas Gruenbacher static int drbd_asb_recover_2p(struct drbd_peer_device *peer_device) __must_hold(local) 3110b411b363SPhilipp Reisner { 311169a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 31126184ea21SAndreas Gruenbacher int hg, rv = -100; 311344ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_2p; 3114b411b363SPhilipp Reisner 311544ed167dSPhilipp Reisner rcu_read_lock(); 311669a22773SAndreas Gruenbacher after_sb_2p = rcu_dereference(peer_device->connection->net_conf)->after_sb_2p; 311744ed167dSPhilipp Reisner rcu_read_unlock(); 311844ed167dSPhilipp Reisner switch (after_sb_2p) { 3119b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 3120b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 3121b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 3122b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 3123b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 3124b411b363SPhilipp Reisner case ASB_CONSENSUS: 3125b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 312644ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 3127d0180171SAndreas Gruenbacher drbd_err(device, "Configuration error.\n"); 3128b411b363SPhilipp Reisner break; 3129b411b363SPhilipp Reisner case ASB_VIOLENTLY: 313069a22773SAndreas Gruenbacher rv = drbd_asb_recover_0p(peer_device); 3131b411b363SPhilipp Reisner break; 3132b411b363SPhilipp Reisner case ASB_DISCONNECT: 3133b411b363SPhilipp Reisner break; 3134b411b363SPhilipp Reisner case ASB_CALL_HELPER: 313569a22773SAndreas Gruenbacher hg = drbd_asb_recover_0p(peer_device); 3136b411b363SPhilipp Reisner if (hg == -1) { 3137bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 3138bb437946SAndreas Gruenbacher 3139b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 3140b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 3141b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 3142b30ab791SAndreas Gruenbacher rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); 3143bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 3144b30ab791SAndreas Gruenbacher drbd_khelper(device, "pri-lost-after-sb"); 3145b411b363SPhilipp Reisner } else { 3146d0180171SAndreas Gruenbacher drbd_warn(device, "Successfully gave up primary role.\n"); 3147b411b363SPhilipp Reisner rv = hg; 3148b411b363SPhilipp Reisner } 3149b411b363SPhilipp Reisner } else 3150b411b363SPhilipp Reisner rv = hg; 3151b411b363SPhilipp Reisner } 3152b411b363SPhilipp Reisner 3153b411b363SPhilipp Reisner return rv; 3154b411b363SPhilipp Reisner } 3155b411b363SPhilipp Reisner 3156b30ab791SAndreas Gruenbacher static void drbd_uuid_dump(struct drbd_device *device, char *text, u64 *uuid, 3157b411b363SPhilipp Reisner u64 bits, u64 flags) 3158b411b363SPhilipp Reisner { 3159b411b363SPhilipp Reisner if (!uuid) { 3160d0180171SAndreas Gruenbacher drbd_info(device, "%s uuid info vanished while I was looking!\n", text); 3161b411b363SPhilipp Reisner return; 3162b411b363SPhilipp Reisner } 3163d0180171SAndreas Gruenbacher drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 3164b411b363SPhilipp Reisner text, 3165b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 3166b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 3167b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 3168b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 3169b411b363SPhilipp Reisner (unsigned long long)bits, 3170b411b363SPhilipp Reisner (unsigned long long)flags); 3171b411b363SPhilipp Reisner } 3172b411b363SPhilipp Reisner 3173b411b363SPhilipp Reisner /* 3174b411b363SPhilipp Reisner 100 after split brain try auto recover 3175b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 3176b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 3177b411b363SPhilipp Reisner 0 no Sync 3178b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 3179b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 3180b411b363SPhilipp Reisner -100 after split brain, disconnect 3181b411b363SPhilipp Reisner -1000 unrelated data 31824a23f264SPhilipp Reisner -1091 requires proto 91 31834a23f264SPhilipp Reisner -1096 requires proto 96 3184b411b363SPhilipp Reisner */ 3185f2d3d75bSLars Ellenberg 3186f2d3d75bSLars Ellenberg static int drbd_uuid_compare(struct drbd_device *const device, enum drbd_role const peer_role, int *rule_nr) __must_hold(local) 3187b411b363SPhilipp Reisner { 318844a4d551SLars Ellenberg struct drbd_peer_device *const peer_device = first_peer_device(device); 318944a4d551SLars Ellenberg struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL; 3190b411b363SPhilipp Reisner u64 self, peer; 3191b411b363SPhilipp Reisner int i, j; 3192b411b363SPhilipp Reisner 3193b30ab791SAndreas Gruenbacher self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 3194b30ab791SAndreas Gruenbacher peer = device->p_uuid[UI_CURRENT] & ~((u64)1); 3195b411b363SPhilipp Reisner 3196b411b363SPhilipp Reisner *rule_nr = 10; 3197b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 3198b411b363SPhilipp Reisner return 0; 3199b411b363SPhilipp Reisner 3200b411b363SPhilipp Reisner *rule_nr = 20; 3201b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 3202b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 3203b411b363SPhilipp Reisner return -2; 3204b411b363SPhilipp Reisner 3205b411b363SPhilipp Reisner *rule_nr = 30; 3206b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 3207b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 3208b411b363SPhilipp Reisner return 2; 3209b411b363SPhilipp Reisner 3210b411b363SPhilipp Reisner if (self == peer) { 3211b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 3212b411b363SPhilipp Reisner 3213b30ab791SAndreas Gruenbacher if (device->p_uuid[UI_BITMAP] == (u64)0 && device->ldev->md.uuid[UI_BITMAP] != (u64)0) { 3214b411b363SPhilipp Reisner 321544a4d551SLars Ellenberg if (connection->agreed_pro_version < 91) 32164a23f264SPhilipp Reisner return -1091; 3217b411b363SPhilipp Reisner 3218b30ab791SAndreas Gruenbacher if ((device->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 3219b30ab791SAndreas Gruenbacher (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 3220d0180171SAndreas Gruenbacher drbd_info(device, "was SyncSource, missed the resync finished event, corrected myself:\n"); 3221b30ab791SAndreas Gruenbacher drbd_uuid_move_history(device); 3222b30ab791SAndreas Gruenbacher device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP]; 3223b30ab791SAndreas Gruenbacher device->ldev->md.uuid[UI_BITMAP] = 0; 3224b411b363SPhilipp Reisner 3225b30ab791SAndreas Gruenbacher drbd_uuid_dump(device, "self", device->ldev->md.uuid, 3226b30ab791SAndreas Gruenbacher device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); 3227b411b363SPhilipp Reisner *rule_nr = 34; 3228b411b363SPhilipp Reisner } else { 3229d0180171SAndreas Gruenbacher drbd_info(device, "was SyncSource (peer failed to write sync_uuid)\n"); 3230b411b363SPhilipp Reisner *rule_nr = 36; 3231b411b363SPhilipp Reisner } 3232b411b363SPhilipp Reisner 3233b411b363SPhilipp Reisner return 1; 3234b411b363SPhilipp Reisner } 3235b411b363SPhilipp Reisner 3236b30ab791SAndreas Gruenbacher if (device->ldev->md.uuid[UI_BITMAP] == (u64)0 && device->p_uuid[UI_BITMAP] != (u64)0) { 3237b411b363SPhilipp Reisner 323844a4d551SLars Ellenberg if (connection->agreed_pro_version < 91) 32394a23f264SPhilipp Reisner return -1091; 3240b411b363SPhilipp Reisner 3241b30ab791SAndreas Gruenbacher if ((device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_BITMAP] & ~((u64)1)) && 3242b30ab791SAndreas Gruenbacher (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 3243d0180171SAndreas Gruenbacher drbd_info(device, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 3244b411b363SPhilipp Reisner 3245b30ab791SAndreas Gruenbacher device->p_uuid[UI_HISTORY_START + 1] = device->p_uuid[UI_HISTORY_START]; 3246b30ab791SAndreas Gruenbacher device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_BITMAP]; 3247b30ab791SAndreas Gruenbacher device->p_uuid[UI_BITMAP] = 0UL; 3248b411b363SPhilipp Reisner 3249b30ab791SAndreas Gruenbacher drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); 3250b411b363SPhilipp Reisner *rule_nr = 35; 3251b411b363SPhilipp Reisner } else { 3252d0180171SAndreas Gruenbacher drbd_info(device, "was SyncTarget (failed to write sync_uuid)\n"); 3253b411b363SPhilipp Reisner *rule_nr = 37; 3254b411b363SPhilipp Reisner } 3255b411b363SPhilipp Reisner 3256b411b363SPhilipp Reisner return -1; 3257b411b363SPhilipp Reisner } 3258b411b363SPhilipp Reisner 3259b411b363SPhilipp Reisner /* Common power [off|failure] */ 3260b30ab791SAndreas Gruenbacher rct = (test_bit(CRASHED_PRIMARY, &device->flags) ? 1 : 0) + 3261b30ab791SAndreas Gruenbacher (device->p_uuid[UI_FLAGS] & 2); 3262b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 3263b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 3264b411b363SPhilipp Reisner *rule_nr = 40; 3265b411b363SPhilipp Reisner 3266f2d3d75bSLars Ellenberg /* Neither has the "crashed primary" flag set, 3267f2d3d75bSLars Ellenberg * only a replication link hickup. */ 3268f2d3d75bSLars Ellenberg if (rct == 0) 3269f2d3d75bSLars Ellenberg return 0; 3270f2d3d75bSLars Ellenberg 3271f2d3d75bSLars Ellenberg /* Current UUID equal and no bitmap uuid; does not necessarily 3272f2d3d75bSLars Ellenberg * mean this was a "simultaneous hard crash", maybe IO was 3273f2d3d75bSLars Ellenberg * frozen, so no UUID-bump happened. 3274f2d3d75bSLars Ellenberg * This is a protocol change, overload DRBD_FF_WSAME as flag 3275f2d3d75bSLars Ellenberg * for "new-enough" peer DRBD version. */ 3276f2d3d75bSLars Ellenberg if (device->state.role == R_PRIMARY || peer_role == R_PRIMARY) { 3277f2d3d75bSLars Ellenberg *rule_nr = 41; 3278f2d3d75bSLars Ellenberg if (!(connection->agreed_features & DRBD_FF_WSAME)) { 3279f2d3d75bSLars Ellenberg drbd_warn(peer_device, "Equivalent unrotated UUIDs, but current primary present.\n"); 3280f2d3d75bSLars Ellenberg return -(0x10000 | PRO_VERSION_MAX | (DRBD_FF_WSAME << 8)); 3281f2d3d75bSLars Ellenberg } 3282f2d3d75bSLars Ellenberg if (device->state.role == R_PRIMARY && peer_role == R_PRIMARY) { 3283f2d3d75bSLars Ellenberg /* At least one has the "crashed primary" bit set, 3284f2d3d75bSLars Ellenberg * both are primary now, but neither has rotated its UUIDs? 3285f2d3d75bSLars Ellenberg * "Can not happen." */ 3286f2d3d75bSLars Ellenberg drbd_err(peer_device, "Equivalent unrotated UUIDs, but both are primary. Can not resolve this.\n"); 3287f2d3d75bSLars Ellenberg return -100; 3288f2d3d75bSLars Ellenberg } 3289f2d3d75bSLars Ellenberg if (device->state.role == R_PRIMARY) 3290f2d3d75bSLars Ellenberg return 1; 3291f2d3d75bSLars Ellenberg return -1; 3292f2d3d75bSLars Ellenberg } 3293f2d3d75bSLars Ellenberg 3294f2d3d75bSLars Ellenberg /* Both are secondary. 3295f2d3d75bSLars Ellenberg * Really looks like recovery from simultaneous hard crash. 3296f2d3d75bSLars Ellenberg * Check which had been primary before, and arbitrate. */ 3297b411b363SPhilipp Reisner switch (rct) { 3298f2d3d75bSLars Ellenberg case 0: /* !self_pri && !peer_pri */ return 0; /* already handled */ 3299b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 3300b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 3301b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 330244a4d551SLars Ellenberg dc = test_bit(RESOLVE_CONFLICTS, &connection->flags); 3303b411b363SPhilipp Reisner return dc ? -1 : 1; 3304b411b363SPhilipp Reisner } 3305b411b363SPhilipp Reisner } 3306b411b363SPhilipp Reisner 3307b411b363SPhilipp Reisner *rule_nr = 50; 3308b30ab791SAndreas Gruenbacher peer = device->p_uuid[UI_BITMAP] & ~((u64)1); 3309b411b363SPhilipp Reisner if (self == peer) 3310b411b363SPhilipp Reisner return -1; 3311b411b363SPhilipp Reisner 3312b411b363SPhilipp Reisner *rule_nr = 51; 3313b30ab791SAndreas Gruenbacher peer = device->p_uuid[UI_HISTORY_START] & ~((u64)1); 3314b411b363SPhilipp Reisner if (self == peer) { 331544a4d551SLars Ellenberg if (connection->agreed_pro_version < 96 ? 3316b30ab791SAndreas Gruenbacher (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 3317b30ab791SAndreas Gruenbacher (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 3318b30ab791SAndreas Gruenbacher peer + UUID_NEW_BM_OFFSET == (device->p_uuid[UI_BITMAP] & ~((u64)1))) { 3319b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 3320b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 3321b411b363SPhilipp Reisner 332244a4d551SLars Ellenberg if (connection->agreed_pro_version < 91) 33234a23f264SPhilipp Reisner return -1091; 3324b411b363SPhilipp Reisner 3325b30ab791SAndreas Gruenbacher device->p_uuid[UI_BITMAP] = device->p_uuid[UI_HISTORY_START]; 3326b30ab791SAndreas Gruenbacher device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_HISTORY_START + 1]; 33274a23f264SPhilipp Reisner 3328d0180171SAndreas Gruenbacher drbd_info(device, "Lost last syncUUID packet, corrected:\n"); 3329b30ab791SAndreas Gruenbacher drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); 33304a23f264SPhilipp Reisner 3331b411b363SPhilipp Reisner return -1; 3332b411b363SPhilipp Reisner } 3333b411b363SPhilipp Reisner } 3334b411b363SPhilipp Reisner 3335b411b363SPhilipp Reisner *rule_nr = 60; 3336b30ab791SAndreas Gruenbacher self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 3337b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 3338b30ab791SAndreas Gruenbacher peer = device->p_uuid[i] & ~((u64)1); 3339b411b363SPhilipp Reisner if (self == peer) 3340b411b363SPhilipp Reisner return -2; 3341b411b363SPhilipp Reisner } 3342b411b363SPhilipp Reisner 3343b411b363SPhilipp Reisner *rule_nr = 70; 3344b30ab791SAndreas Gruenbacher self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 3345b30ab791SAndreas Gruenbacher peer = device->p_uuid[UI_CURRENT] & ~((u64)1); 3346b411b363SPhilipp Reisner if (self == peer) 3347b411b363SPhilipp Reisner return 1; 3348b411b363SPhilipp Reisner 3349b411b363SPhilipp Reisner *rule_nr = 71; 3350b30ab791SAndreas Gruenbacher self = device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 3351b411b363SPhilipp Reisner if (self == peer) { 335244a4d551SLars Ellenberg if (connection->agreed_pro_version < 96 ? 3353b30ab791SAndreas Gruenbacher (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 3354b30ab791SAndreas Gruenbacher (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 3355b30ab791SAndreas Gruenbacher self + UUID_NEW_BM_OFFSET == (device->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 3356b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 3357b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 3358b411b363SPhilipp Reisner 335944a4d551SLars Ellenberg if (connection->agreed_pro_version < 91) 33604a23f264SPhilipp Reisner return -1091; 3361b411b363SPhilipp Reisner 3362b30ab791SAndreas Gruenbacher __drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_HISTORY_START]); 3363b30ab791SAndreas Gruenbacher __drbd_uuid_set(device, UI_HISTORY_START, device->ldev->md.uuid[UI_HISTORY_START + 1]); 3364b411b363SPhilipp Reisner 3365d0180171SAndreas Gruenbacher drbd_info(device, "Last syncUUID did not get through, corrected:\n"); 3366b30ab791SAndreas Gruenbacher drbd_uuid_dump(device, "self", device->ldev->md.uuid, 3367b30ab791SAndreas Gruenbacher device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); 3368b411b363SPhilipp Reisner 3369b411b363SPhilipp Reisner return 1; 3370b411b363SPhilipp Reisner } 3371b411b363SPhilipp Reisner } 3372b411b363SPhilipp Reisner 3373b411b363SPhilipp Reisner 3374b411b363SPhilipp Reisner *rule_nr = 80; 3375b30ab791SAndreas Gruenbacher peer = device->p_uuid[UI_CURRENT] & ~((u64)1); 3376b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 3377b30ab791SAndreas Gruenbacher self = device->ldev->md.uuid[i] & ~((u64)1); 3378b411b363SPhilipp Reisner if (self == peer) 3379b411b363SPhilipp Reisner return 2; 3380b411b363SPhilipp Reisner } 3381b411b363SPhilipp Reisner 3382b411b363SPhilipp Reisner *rule_nr = 90; 3383b30ab791SAndreas Gruenbacher self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 3384b30ab791SAndreas Gruenbacher peer = device->p_uuid[UI_BITMAP] & ~((u64)1); 3385b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 3386b411b363SPhilipp Reisner return 100; 3387b411b363SPhilipp Reisner 3388b411b363SPhilipp Reisner *rule_nr = 100; 3389b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 3390b30ab791SAndreas Gruenbacher self = device->ldev->md.uuid[i] & ~((u64)1); 3391b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 3392b30ab791SAndreas Gruenbacher peer = device->p_uuid[j] & ~((u64)1); 3393b411b363SPhilipp Reisner if (self == peer) 3394b411b363SPhilipp Reisner return -100; 3395b411b363SPhilipp Reisner } 3396b411b363SPhilipp Reisner } 3397b411b363SPhilipp Reisner 3398b411b363SPhilipp Reisner return -1000; 3399b411b363SPhilipp Reisner } 3400b411b363SPhilipp Reisner 3401b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 3402b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 3403b411b363SPhilipp Reisner */ 340469a22773SAndreas Gruenbacher static enum drbd_conns drbd_sync_handshake(struct drbd_peer_device *peer_device, 340569a22773SAndreas Gruenbacher enum drbd_role peer_role, 3406b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 3407b411b363SPhilipp Reisner { 340869a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 3409b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 3410b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 341144ed167dSPhilipp Reisner struct net_conf *nc; 34126dff2902SAndreas Gruenbacher int hg, rule_nr, rr_conflict, tentative; 3413b411b363SPhilipp Reisner 3414b30ab791SAndreas Gruenbacher mydisk = device->state.disk; 3415b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 3416b30ab791SAndreas Gruenbacher mydisk = device->new_state_tmp.disk; 3417b411b363SPhilipp Reisner 3418d0180171SAndreas Gruenbacher drbd_info(device, "drbd_sync_handshake:\n"); 34199f2247bbSPhilipp Reisner 3420b30ab791SAndreas Gruenbacher spin_lock_irq(&device->ldev->md.uuid_lock); 3421b30ab791SAndreas Gruenbacher drbd_uuid_dump(device, "self", device->ldev->md.uuid, device->comm_bm_set, 0); 3422b30ab791SAndreas Gruenbacher drbd_uuid_dump(device, "peer", device->p_uuid, 3423b30ab791SAndreas Gruenbacher device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); 3424b411b363SPhilipp Reisner 3425f2d3d75bSLars Ellenberg hg = drbd_uuid_compare(device, peer_role, &rule_nr); 3426b30ab791SAndreas Gruenbacher spin_unlock_irq(&device->ldev->md.uuid_lock); 3427b411b363SPhilipp Reisner 3428d0180171SAndreas Gruenbacher drbd_info(device, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 3429b411b363SPhilipp Reisner 3430b411b363SPhilipp Reisner if (hg == -1000) { 3431d0180171SAndreas Gruenbacher drbd_alert(device, "Unrelated data, aborting!\n"); 3432b411b363SPhilipp Reisner return C_MASK; 3433b411b363SPhilipp Reisner } 3434f2d3d75bSLars Ellenberg if (hg < -0x10000) { 3435f2d3d75bSLars Ellenberg int proto, fflags; 3436f2d3d75bSLars Ellenberg hg = -hg; 3437f2d3d75bSLars Ellenberg proto = hg & 0xff; 3438f2d3d75bSLars Ellenberg fflags = (hg >> 8) & 0xff; 3439f2d3d75bSLars Ellenberg drbd_alert(device, "To resolve this both sides have to support at least protocol %d and feature flags 0x%x\n", 3440f2d3d75bSLars Ellenberg proto, fflags); 3441f2d3d75bSLars Ellenberg return C_MASK; 3442f2d3d75bSLars Ellenberg } 34434a23f264SPhilipp Reisner if (hg < -1000) { 3444d0180171SAndreas Gruenbacher drbd_alert(device, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 3445b411b363SPhilipp Reisner return C_MASK; 3446b411b363SPhilipp Reisner } 3447b411b363SPhilipp Reisner 3448b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 3449b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 3450b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 3451b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 3452b411b363SPhilipp Reisner if (f) 3453b411b363SPhilipp Reisner hg = hg*2; 3454d0180171SAndreas Gruenbacher drbd_info(device, "Becoming sync %s due to disk states.\n", 3455b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 3456b411b363SPhilipp Reisner } 3457b411b363SPhilipp Reisner 34583a11a487SAdam Gandelman if (abs(hg) == 100) 3459b30ab791SAndreas Gruenbacher drbd_khelper(device, "initial-split-brain"); 34603a11a487SAdam Gandelman 346144ed167dSPhilipp Reisner rcu_read_lock(); 346269a22773SAndreas Gruenbacher nc = rcu_dereference(peer_device->connection->net_conf); 346344ed167dSPhilipp Reisner 346444ed167dSPhilipp Reisner if (hg == 100 || (hg == -100 && nc->always_asbp)) { 3465b30ab791SAndreas Gruenbacher int pcount = (device->state.role == R_PRIMARY) 3466b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 3467b411b363SPhilipp Reisner int forced = (hg == -100); 3468b411b363SPhilipp Reisner 3469b411b363SPhilipp Reisner switch (pcount) { 3470b411b363SPhilipp Reisner case 0: 347169a22773SAndreas Gruenbacher hg = drbd_asb_recover_0p(peer_device); 3472b411b363SPhilipp Reisner break; 3473b411b363SPhilipp Reisner case 1: 347469a22773SAndreas Gruenbacher hg = drbd_asb_recover_1p(peer_device); 3475b411b363SPhilipp Reisner break; 3476b411b363SPhilipp Reisner case 2: 347769a22773SAndreas Gruenbacher hg = drbd_asb_recover_2p(peer_device); 3478b411b363SPhilipp Reisner break; 3479b411b363SPhilipp Reisner } 3480b411b363SPhilipp Reisner if (abs(hg) < 100) { 3481d0180171SAndreas Gruenbacher drbd_warn(device, "Split-Brain detected, %d primaries, " 3482b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 3483b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 3484b411b363SPhilipp Reisner if (forced) { 3485d0180171SAndreas Gruenbacher drbd_warn(device, "Doing a full sync, since" 3486b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 3487b411b363SPhilipp Reisner hg = hg*2; 3488b411b363SPhilipp Reisner } 3489b411b363SPhilipp Reisner } 3490b411b363SPhilipp Reisner } 3491b411b363SPhilipp Reisner 3492b411b363SPhilipp Reisner if (hg == -100) { 3493b30ab791SAndreas Gruenbacher if (test_bit(DISCARD_MY_DATA, &device->flags) && !(device->p_uuid[UI_FLAGS]&1)) 3494b411b363SPhilipp Reisner hg = -1; 3495b30ab791SAndreas Gruenbacher if (!test_bit(DISCARD_MY_DATA, &device->flags) && (device->p_uuid[UI_FLAGS]&1)) 3496b411b363SPhilipp Reisner hg = 1; 3497b411b363SPhilipp Reisner 3498b411b363SPhilipp Reisner if (abs(hg) < 100) 3499d0180171SAndreas Gruenbacher drbd_warn(device, "Split-Brain detected, manually solved. " 3500b411b363SPhilipp Reisner "Sync from %s node\n", 3501b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 3502b411b363SPhilipp Reisner } 350344ed167dSPhilipp Reisner rr_conflict = nc->rr_conflict; 35046dff2902SAndreas Gruenbacher tentative = nc->tentative; 350544ed167dSPhilipp Reisner rcu_read_unlock(); 3506b411b363SPhilipp Reisner 3507b411b363SPhilipp Reisner if (hg == -100) { 3508580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 3509580b9767SLars Ellenberg * after an attempted attach on a diskless node. 3510580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 3511580b9767SLars Ellenberg * to that disk, in a way... */ 3512d0180171SAndreas Gruenbacher drbd_alert(device, "Split-Brain detected but unresolved, dropping connection!\n"); 3513b30ab791SAndreas Gruenbacher drbd_khelper(device, "split-brain"); 3514b411b363SPhilipp Reisner return C_MASK; 3515b411b363SPhilipp Reisner } 3516b411b363SPhilipp Reisner 3517b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 3518d0180171SAndreas Gruenbacher drbd_err(device, "I shall become SyncSource, but I am inconsistent!\n"); 3519b411b363SPhilipp Reisner return C_MASK; 3520b411b363SPhilipp Reisner } 3521b411b363SPhilipp Reisner 3522b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 3523b30ab791SAndreas Gruenbacher device->state.role == R_PRIMARY && device->state.disk >= D_CONSISTENT) { 352444ed167dSPhilipp Reisner switch (rr_conflict) { 3525b411b363SPhilipp Reisner case ASB_CALL_HELPER: 3526b30ab791SAndreas Gruenbacher drbd_khelper(device, "pri-lost"); 3527b411b363SPhilipp Reisner /* fall through */ 3528b411b363SPhilipp Reisner case ASB_DISCONNECT: 3529d0180171SAndreas Gruenbacher drbd_err(device, "I shall become SyncTarget, but I am primary!\n"); 3530b411b363SPhilipp Reisner return C_MASK; 3531b411b363SPhilipp Reisner case ASB_VIOLENTLY: 3532d0180171SAndreas Gruenbacher drbd_warn(device, "Becoming SyncTarget, violating the stable-data" 3533b411b363SPhilipp Reisner "assumption\n"); 3534b411b363SPhilipp Reisner } 3535b411b363SPhilipp Reisner } 3536b411b363SPhilipp Reisner 353769a22773SAndreas Gruenbacher if (tentative || test_bit(CONN_DRY_RUN, &peer_device->connection->flags)) { 3538cf14c2e9SPhilipp Reisner if (hg == 0) 3539d0180171SAndreas Gruenbacher drbd_info(device, "dry-run connect: No resync, would become Connected immediately.\n"); 3540cf14c2e9SPhilipp Reisner else 3541d0180171SAndreas Gruenbacher drbd_info(device, "dry-run connect: Would become %s, doing a %s resync.", 3542cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 3543cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 3544cf14c2e9SPhilipp Reisner return C_MASK; 3545cf14c2e9SPhilipp Reisner } 3546cf14c2e9SPhilipp Reisner 3547b411b363SPhilipp Reisner if (abs(hg) >= 2) { 3548d0180171SAndreas Gruenbacher drbd_info(device, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 3549b30ab791SAndreas Gruenbacher if (drbd_bitmap_io(device, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 355020ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 3551b411b363SPhilipp Reisner return C_MASK; 3552b411b363SPhilipp Reisner } 3553b411b363SPhilipp Reisner 3554b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 3555b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 3556b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 3557b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 3558b411b363SPhilipp Reisner } else { 3559b411b363SPhilipp Reisner rv = C_CONNECTED; 3560b30ab791SAndreas Gruenbacher if (drbd_bm_total_weight(device)) { 3561d0180171SAndreas Gruenbacher drbd_info(device, "No resync, but %lu bits in bitmap!\n", 3562b30ab791SAndreas Gruenbacher drbd_bm_total_weight(device)); 3563b411b363SPhilipp Reisner } 3564b411b363SPhilipp Reisner } 3565b411b363SPhilipp Reisner 3566b411b363SPhilipp Reisner return rv; 3567b411b363SPhilipp Reisner } 3568b411b363SPhilipp Reisner 3569f179d76dSPhilipp Reisner static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) 3570b411b363SPhilipp Reisner { 3571b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 3572f179d76dSPhilipp Reisner if (peer == ASB_DISCARD_REMOTE) 3573f179d76dSPhilipp Reisner return ASB_DISCARD_LOCAL; 3574b411b363SPhilipp Reisner 3575b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 3576f179d76dSPhilipp Reisner if (peer == ASB_DISCARD_LOCAL) 3577f179d76dSPhilipp Reisner return ASB_DISCARD_REMOTE; 3578b411b363SPhilipp Reisner 3579b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 3580f179d76dSPhilipp Reisner return peer; 3581b411b363SPhilipp Reisner } 3582b411b363SPhilipp Reisner 3583bde89a9eSAndreas Gruenbacher static int receive_protocol(struct drbd_connection *connection, struct packet_info *pi) 3584b411b363SPhilipp Reisner { 3585e658983aSAndreas Gruenbacher struct p_protocol *p = pi->data; 3586036b17eaSPhilipp Reisner enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 3587036b17eaSPhilipp Reisner int p_proto, p_discard_my_data, p_two_primaries, cf; 3588036b17eaSPhilipp Reisner struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; 3589036b17eaSPhilipp Reisner char integrity_alg[SHARED_SECRET_MAX] = ""; 35909534d671SHerbert Xu struct crypto_ahash *peer_integrity_tfm = NULL; 35917aca6c75SPhilipp Reisner void *int_dig_in = NULL, *int_dig_vv = NULL; 3592b411b363SPhilipp Reisner 3593b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 3594b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 3595b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 3596b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 3597b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 3598cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 35996139f60dSAndreas Gruenbacher p_discard_my_data = cf & CF_DISCARD_MY_DATA; 3600cf14c2e9SPhilipp Reisner 3601bde89a9eSAndreas Gruenbacher if (connection->agreed_pro_version >= 87) { 360286db0618SAndreas Gruenbacher int err; 360386db0618SAndreas Gruenbacher 360488104ca4SAndreas Gruenbacher if (pi->size > sizeof(integrity_alg)) 360586db0618SAndreas Gruenbacher return -EIO; 3606bde89a9eSAndreas Gruenbacher err = drbd_recv_all(connection, integrity_alg, pi->size); 360786db0618SAndreas Gruenbacher if (err) 360886db0618SAndreas Gruenbacher return err; 360988104ca4SAndreas Gruenbacher integrity_alg[SHARED_SECRET_MAX - 1] = 0; 3610036b17eaSPhilipp Reisner } 361186db0618SAndreas Gruenbacher 36127d4c782cSAndreas Gruenbacher if (pi->cmd != P_PROTOCOL_UPDATE) { 3613bde89a9eSAndreas Gruenbacher clear_bit(CONN_DRY_RUN, &connection->flags); 3614cf14c2e9SPhilipp Reisner 3615cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 3616bde89a9eSAndreas Gruenbacher set_bit(CONN_DRY_RUN, &connection->flags); 3617b411b363SPhilipp Reisner 361844ed167dSPhilipp Reisner rcu_read_lock(); 3619bde89a9eSAndreas Gruenbacher nc = rcu_dereference(connection->net_conf); 362044ed167dSPhilipp Reisner 3621036b17eaSPhilipp Reisner if (p_proto != nc->wire_protocol) { 36221ec861ebSAndreas Gruenbacher drbd_err(connection, "incompatible %s settings\n", "protocol"); 362344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3624b411b363SPhilipp Reisner } 3625b411b363SPhilipp Reisner 3626f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { 36271ec861ebSAndreas Gruenbacher drbd_err(connection, "incompatible %s settings\n", "after-sb-0pri"); 362844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3629b411b363SPhilipp Reisner } 3630b411b363SPhilipp Reisner 3631f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { 36321ec861ebSAndreas Gruenbacher drbd_err(connection, "incompatible %s settings\n", "after-sb-1pri"); 363344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3634b411b363SPhilipp Reisner } 3635b411b363SPhilipp Reisner 3636f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { 36371ec861ebSAndreas Gruenbacher drbd_err(connection, "incompatible %s settings\n", "after-sb-2pri"); 363844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3639b411b363SPhilipp Reisner } 3640b411b363SPhilipp Reisner 36416139f60dSAndreas Gruenbacher if (p_discard_my_data && nc->discard_my_data) { 36421ec861ebSAndreas Gruenbacher drbd_err(connection, "incompatible %s settings\n", "discard-my-data"); 364344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3644b411b363SPhilipp Reisner } 3645b411b363SPhilipp Reisner 364644ed167dSPhilipp Reisner if (p_two_primaries != nc->two_primaries) { 36471ec861ebSAndreas Gruenbacher drbd_err(connection, "incompatible %s settings\n", "allow-two-primaries"); 364844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3649b411b363SPhilipp Reisner } 3650b411b363SPhilipp Reisner 3651036b17eaSPhilipp Reisner if (strcmp(integrity_alg, nc->integrity_alg)) { 36521ec861ebSAndreas Gruenbacher drbd_err(connection, "incompatible %s settings\n", "data-integrity-alg"); 3653036b17eaSPhilipp Reisner goto disconnect_rcu_unlock; 3654036b17eaSPhilipp Reisner } 3655036b17eaSPhilipp Reisner 365686db0618SAndreas Gruenbacher rcu_read_unlock(); 3657fbc12f45SAndreas Gruenbacher } 36587d4c782cSAndreas Gruenbacher 36597d4c782cSAndreas Gruenbacher if (integrity_alg[0]) { 36607d4c782cSAndreas Gruenbacher int hash_size; 36617d4c782cSAndreas Gruenbacher 36627d4c782cSAndreas Gruenbacher /* 36637d4c782cSAndreas Gruenbacher * We can only change the peer data integrity algorithm 36647d4c782cSAndreas Gruenbacher * here. Changing our own data integrity algorithm 36657d4c782cSAndreas Gruenbacher * requires that we send a P_PROTOCOL_UPDATE packet at 36667d4c782cSAndreas Gruenbacher * the same time; otherwise, the peer has no way to 36677d4c782cSAndreas Gruenbacher * tell between which packets the algorithm should 36687d4c782cSAndreas Gruenbacher * change. 36697d4c782cSAndreas Gruenbacher */ 36707d4c782cSAndreas Gruenbacher 36719534d671SHerbert Xu peer_integrity_tfm = crypto_alloc_ahash(integrity_alg, 0, CRYPTO_ALG_ASYNC); 36721b57e663SLars Ellenberg if (IS_ERR(peer_integrity_tfm)) { 36731b57e663SLars Ellenberg peer_integrity_tfm = NULL; 36741ec861ebSAndreas Gruenbacher drbd_err(connection, "peer data-integrity-alg %s not supported\n", 36757d4c782cSAndreas Gruenbacher integrity_alg); 3676b411b363SPhilipp Reisner goto disconnect; 3677b411b363SPhilipp Reisner } 3678b411b363SPhilipp Reisner 36799534d671SHerbert Xu hash_size = crypto_ahash_digestsize(peer_integrity_tfm); 36807d4c782cSAndreas Gruenbacher int_dig_in = kmalloc(hash_size, GFP_KERNEL); 36817d4c782cSAndreas Gruenbacher int_dig_vv = kmalloc(hash_size, GFP_KERNEL); 36827d4c782cSAndreas Gruenbacher if (!(int_dig_in && int_dig_vv)) { 36831ec861ebSAndreas Gruenbacher drbd_err(connection, "Allocation of buffers for data integrity checking failed\n"); 36847d4c782cSAndreas Gruenbacher goto disconnect; 36857d4c782cSAndreas Gruenbacher } 36867d4c782cSAndreas Gruenbacher } 36877d4c782cSAndreas Gruenbacher 36887d4c782cSAndreas Gruenbacher new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); 36897d4c782cSAndreas Gruenbacher if (!new_net_conf) { 36901ec861ebSAndreas Gruenbacher drbd_err(connection, "Allocation of new net_conf failed\n"); 3691b411b363SPhilipp Reisner goto disconnect; 3692b411b363SPhilipp Reisner } 3693b411b363SPhilipp Reisner 3694bde89a9eSAndreas Gruenbacher mutex_lock(&connection->data.mutex); 36950500813fSAndreas Gruenbacher mutex_lock(&connection->resource->conf_update); 3696bde89a9eSAndreas Gruenbacher old_net_conf = connection->net_conf; 36977d4c782cSAndreas Gruenbacher *new_net_conf = *old_net_conf; 3698b411b363SPhilipp Reisner 36997d4c782cSAndreas Gruenbacher new_net_conf->wire_protocol = p_proto; 37007d4c782cSAndreas Gruenbacher new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); 37017d4c782cSAndreas Gruenbacher new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); 37027d4c782cSAndreas Gruenbacher new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); 37037d4c782cSAndreas Gruenbacher new_net_conf->two_primaries = p_two_primaries; 3704b411b363SPhilipp Reisner 3705bde89a9eSAndreas Gruenbacher rcu_assign_pointer(connection->net_conf, new_net_conf); 37060500813fSAndreas Gruenbacher mutex_unlock(&connection->resource->conf_update); 3707bde89a9eSAndreas Gruenbacher mutex_unlock(&connection->data.mutex); 3708b411b363SPhilipp Reisner 37099534d671SHerbert Xu crypto_free_ahash(connection->peer_integrity_tfm); 3710bde89a9eSAndreas Gruenbacher kfree(connection->int_dig_in); 3711bde89a9eSAndreas Gruenbacher kfree(connection->int_dig_vv); 3712bde89a9eSAndreas Gruenbacher connection->peer_integrity_tfm = peer_integrity_tfm; 3713bde89a9eSAndreas Gruenbacher connection->int_dig_in = int_dig_in; 3714bde89a9eSAndreas Gruenbacher connection->int_dig_vv = int_dig_vv; 3715b411b363SPhilipp Reisner 37167d4c782cSAndreas Gruenbacher if (strcmp(old_net_conf->integrity_alg, integrity_alg)) 37171ec861ebSAndreas Gruenbacher drbd_info(connection, "peer data-integrity-alg: %s\n", 37187d4c782cSAndreas Gruenbacher integrity_alg[0] ? integrity_alg : "(none)"); 3719b411b363SPhilipp Reisner 37207d4c782cSAndreas Gruenbacher synchronize_rcu(); 37217d4c782cSAndreas Gruenbacher kfree(old_net_conf); 372282bc0194SAndreas Gruenbacher return 0; 3723b411b363SPhilipp Reisner 372444ed167dSPhilipp Reisner disconnect_rcu_unlock: 372544ed167dSPhilipp Reisner rcu_read_unlock(); 3726b411b363SPhilipp Reisner disconnect: 37279534d671SHerbert Xu crypto_free_ahash(peer_integrity_tfm); 3728036b17eaSPhilipp Reisner kfree(int_dig_in); 3729036b17eaSPhilipp Reisner kfree(int_dig_vv); 3730bde89a9eSAndreas Gruenbacher conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); 373182bc0194SAndreas Gruenbacher return -EIO; 3732b411b363SPhilipp Reisner } 3733b411b363SPhilipp Reisner 3734b411b363SPhilipp Reisner /* helper function 3735b411b363SPhilipp Reisner * input: alg name, feature name 3736b411b363SPhilipp Reisner * return: NULL (alg name was "") 3737b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 3738b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 37399534d671SHerbert Xu static struct crypto_ahash *drbd_crypto_alloc_digest_safe(const struct drbd_device *device, 3740b411b363SPhilipp Reisner const char *alg, const char *name) 3741b411b363SPhilipp Reisner { 37429534d671SHerbert Xu struct crypto_ahash *tfm; 3743b411b363SPhilipp Reisner 3744b411b363SPhilipp Reisner if (!alg[0]) 3745b411b363SPhilipp Reisner return NULL; 3746b411b363SPhilipp Reisner 37479534d671SHerbert Xu tfm = crypto_alloc_ahash(alg, 0, CRYPTO_ALG_ASYNC); 3748b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 3749d0180171SAndreas Gruenbacher drbd_err(device, "Can not allocate \"%s\" as %s (reason: %ld)\n", 3750b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 3751b411b363SPhilipp Reisner return tfm; 3752b411b363SPhilipp Reisner } 3753b411b363SPhilipp Reisner return tfm; 3754b411b363SPhilipp Reisner } 3755b411b363SPhilipp Reisner 3756bde89a9eSAndreas Gruenbacher static int ignore_remaining_packet(struct drbd_connection *connection, struct packet_info *pi) 3757b411b363SPhilipp Reisner { 3758bde89a9eSAndreas Gruenbacher void *buffer = connection->data.rbuf; 37594a76b161SAndreas Gruenbacher int size = pi->size; 37604a76b161SAndreas Gruenbacher 37614a76b161SAndreas Gruenbacher while (size) { 37624a76b161SAndreas Gruenbacher int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); 3763bde89a9eSAndreas Gruenbacher s = drbd_recv(connection, buffer, s); 37644a76b161SAndreas Gruenbacher if (s <= 0) { 37654a76b161SAndreas Gruenbacher if (s < 0) 37664a76b161SAndreas Gruenbacher return s; 37674a76b161SAndreas Gruenbacher break; 37684a76b161SAndreas Gruenbacher } 37694a76b161SAndreas Gruenbacher size -= s; 37704a76b161SAndreas Gruenbacher } 37714a76b161SAndreas Gruenbacher if (size) 37724a76b161SAndreas Gruenbacher return -EIO; 37734a76b161SAndreas Gruenbacher return 0; 37744a76b161SAndreas Gruenbacher } 37754a76b161SAndreas Gruenbacher 37764a76b161SAndreas Gruenbacher /* 37774a76b161SAndreas Gruenbacher * config_unknown_volume - device configuration command for unknown volume 37784a76b161SAndreas Gruenbacher * 37794a76b161SAndreas Gruenbacher * When a device is added to an existing connection, the node on which the 37804a76b161SAndreas Gruenbacher * device is added first will send configuration commands to its peer but the 37814a76b161SAndreas Gruenbacher * peer will not know about the device yet. It will warn and ignore these 37824a76b161SAndreas Gruenbacher * commands. Once the device is added on the second node, the second node will 37834a76b161SAndreas Gruenbacher * send the same device configuration commands, but in the other direction. 37844a76b161SAndreas Gruenbacher * 37854a76b161SAndreas Gruenbacher * (We can also end up here if drbd is misconfigured.) 37864a76b161SAndreas Gruenbacher */ 3787bde89a9eSAndreas Gruenbacher static int config_unknown_volume(struct drbd_connection *connection, struct packet_info *pi) 37884a76b161SAndreas Gruenbacher { 37891ec861ebSAndreas Gruenbacher drbd_warn(connection, "%s packet received for volume %u, which is not configured locally\n", 37902fcb8f30SAndreas Gruenbacher cmdname(pi->cmd), pi->vnr); 3791bde89a9eSAndreas Gruenbacher return ignore_remaining_packet(connection, pi); 37924a76b161SAndreas Gruenbacher } 37934a76b161SAndreas Gruenbacher 3794bde89a9eSAndreas Gruenbacher static int receive_SyncParam(struct drbd_connection *connection, struct packet_info *pi) 37954a76b161SAndreas Gruenbacher { 37969f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 3797b30ab791SAndreas Gruenbacher struct drbd_device *device; 3798e658983aSAndreas Gruenbacher struct p_rs_param_95 *p; 3799b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 38009534d671SHerbert Xu struct crypto_ahash *verify_tfm = NULL; 38019534d671SHerbert Xu struct crypto_ahash *csums_tfm = NULL; 38022ec91e0eSPhilipp Reisner struct net_conf *old_net_conf, *new_net_conf = NULL; 3803813472ceSPhilipp Reisner struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; 3804bde89a9eSAndreas Gruenbacher const int apv = connection->agreed_pro_version; 3805813472ceSPhilipp Reisner struct fifo_buffer *old_plan = NULL, *new_plan = NULL; 3806778f271dSPhilipp Reisner int fifo_size = 0; 380782bc0194SAndreas Gruenbacher int err; 3808b411b363SPhilipp Reisner 38099f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 38109f4fe9adSAndreas Gruenbacher if (!peer_device) 3811bde89a9eSAndreas Gruenbacher return config_unknown_volume(connection, pi); 38129f4fe9adSAndreas Gruenbacher device = peer_device->device; 3813b411b363SPhilipp Reisner 3814b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 3815b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 3816b411b363SPhilipp Reisner + SHARED_SECRET_MAX 38178e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 38188e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 3819b411b363SPhilipp Reisner 3820e2857216SAndreas Gruenbacher if (pi->size > exp_max_sz) { 3821d0180171SAndreas Gruenbacher drbd_err(device, "SyncParam packet too long: received %u, expected <= %u bytes\n", 3822e2857216SAndreas Gruenbacher pi->size, exp_max_sz); 382382bc0194SAndreas Gruenbacher return -EIO; 3824b411b363SPhilipp Reisner } 3825b411b363SPhilipp Reisner 3826b411b363SPhilipp Reisner if (apv <= 88) { 3827e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param); 3828e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 38298e26f9ccSPhilipp Reisner } else if (apv <= 94) { 3830e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_89); 3831e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 38320b0ba1efSAndreas Gruenbacher D_ASSERT(device, data_size == 0); 38338e26f9ccSPhilipp Reisner } else { 3834e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_95); 3835e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 38360b0ba1efSAndreas Gruenbacher D_ASSERT(device, data_size == 0); 3837b411b363SPhilipp Reisner } 3838b411b363SPhilipp Reisner 3839b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 3840e658983aSAndreas Gruenbacher p = pi->data; 3841b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 3842b411b363SPhilipp Reisner 38439f4fe9adSAndreas Gruenbacher err = drbd_recv_all(peer_device->connection, p, header_size); 384482bc0194SAndreas Gruenbacher if (err) 384582bc0194SAndreas Gruenbacher return err; 3846b411b363SPhilipp Reisner 38470500813fSAndreas Gruenbacher mutex_lock(&connection->resource->conf_update); 38489f4fe9adSAndreas Gruenbacher old_net_conf = peer_device->connection->net_conf; 3849b30ab791SAndreas Gruenbacher if (get_ldev(device)) { 3850daeda1ccSPhilipp Reisner new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); 3851daeda1ccSPhilipp Reisner if (!new_disk_conf) { 3852b30ab791SAndreas Gruenbacher put_ldev(device); 38530500813fSAndreas Gruenbacher mutex_unlock(&connection->resource->conf_update); 3854d0180171SAndreas Gruenbacher drbd_err(device, "Allocation of new disk_conf failed\n"); 3855daeda1ccSPhilipp Reisner return -ENOMEM; 3856f399002eSLars Ellenberg } 3857b411b363SPhilipp Reisner 3858b30ab791SAndreas Gruenbacher old_disk_conf = device->ldev->disk_conf; 3859daeda1ccSPhilipp Reisner *new_disk_conf = *old_disk_conf; 3860daeda1ccSPhilipp Reisner 38616394b935SAndreas Gruenbacher new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); 3862813472ceSPhilipp Reisner } 3863b411b363SPhilipp Reisner 3864b411b363SPhilipp Reisner if (apv >= 88) { 3865b411b363SPhilipp Reisner if (apv == 88) { 38665de73827SPhilipp Reisner if (data_size > SHARED_SECRET_MAX || data_size == 0) { 3867d0180171SAndreas Gruenbacher drbd_err(device, "verify-alg of wrong size, " 38685de73827SPhilipp Reisner "peer wants %u, accepting only up to %u byte\n", 3869b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 3870813472ceSPhilipp Reisner err = -EIO; 3871813472ceSPhilipp Reisner goto reconnect; 3872b411b363SPhilipp Reisner } 3873b411b363SPhilipp Reisner 38749f4fe9adSAndreas Gruenbacher err = drbd_recv_all(peer_device->connection, p->verify_alg, data_size); 3875813472ceSPhilipp Reisner if (err) 3876813472ceSPhilipp Reisner goto reconnect; 3877b411b363SPhilipp Reisner /* we expect NUL terminated string */ 3878b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 38790b0ba1efSAndreas Gruenbacher D_ASSERT(device, p->verify_alg[data_size-1] == 0); 3880b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 3881b411b363SPhilipp Reisner 3882b411b363SPhilipp Reisner } else /* apv >= 89 */ { 3883b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 3884b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 38850b0ba1efSAndreas Gruenbacher D_ASSERT(device, p->verify_alg[SHARED_SECRET_MAX-1] == 0); 38860b0ba1efSAndreas Gruenbacher D_ASSERT(device, p->csums_alg[SHARED_SECRET_MAX-1] == 0); 3887b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 3888b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 3889b411b363SPhilipp Reisner } 3890b411b363SPhilipp Reisner 38912ec91e0eSPhilipp Reisner if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { 3892b30ab791SAndreas Gruenbacher if (device->state.conn == C_WF_REPORT_PARAMS) { 3893d0180171SAndreas Gruenbacher drbd_err(device, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 38942ec91e0eSPhilipp Reisner old_net_conf->verify_alg, p->verify_alg); 3895b411b363SPhilipp Reisner goto disconnect; 3896b411b363SPhilipp Reisner } 3897b30ab791SAndreas Gruenbacher verify_tfm = drbd_crypto_alloc_digest_safe(device, 3898b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 3899b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 3900b411b363SPhilipp Reisner verify_tfm = NULL; 3901b411b363SPhilipp Reisner goto disconnect; 3902b411b363SPhilipp Reisner } 3903b411b363SPhilipp Reisner } 3904b411b363SPhilipp Reisner 39052ec91e0eSPhilipp Reisner if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { 3906b30ab791SAndreas Gruenbacher if (device->state.conn == C_WF_REPORT_PARAMS) { 3907d0180171SAndreas Gruenbacher drbd_err(device, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 39082ec91e0eSPhilipp Reisner old_net_conf->csums_alg, p->csums_alg); 3909b411b363SPhilipp Reisner goto disconnect; 3910b411b363SPhilipp Reisner } 3911b30ab791SAndreas Gruenbacher csums_tfm = drbd_crypto_alloc_digest_safe(device, 3912b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 3913b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 3914b411b363SPhilipp Reisner csums_tfm = NULL; 3915b411b363SPhilipp Reisner goto disconnect; 3916b411b363SPhilipp Reisner } 3917b411b363SPhilipp Reisner } 3918b411b363SPhilipp Reisner 3919813472ceSPhilipp Reisner if (apv > 94 && new_disk_conf) { 3920daeda1ccSPhilipp Reisner new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 3921daeda1ccSPhilipp Reisner new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); 3922daeda1ccSPhilipp Reisner new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); 3923daeda1ccSPhilipp Reisner new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); 3924778f271dSPhilipp Reisner 3925daeda1ccSPhilipp Reisner fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; 3926b30ab791SAndreas Gruenbacher if (fifo_size != device->rs_plan_s->size) { 3927813472ceSPhilipp Reisner new_plan = fifo_alloc(fifo_size); 3928813472ceSPhilipp Reisner if (!new_plan) { 3929d0180171SAndreas Gruenbacher drbd_err(device, "kmalloc of fifo_buffer failed"); 3930b30ab791SAndreas Gruenbacher put_ldev(device); 3931778f271dSPhilipp Reisner goto disconnect; 3932778f271dSPhilipp Reisner } 3933778f271dSPhilipp Reisner } 39348e26f9ccSPhilipp Reisner } 3935b411b363SPhilipp Reisner 393691fd4dadSPhilipp Reisner if (verify_tfm || csums_tfm) { 39372ec91e0eSPhilipp Reisner new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 39382ec91e0eSPhilipp Reisner if (!new_net_conf) { 3939d0180171SAndreas Gruenbacher drbd_err(device, "Allocation of new net_conf failed\n"); 394091fd4dadSPhilipp Reisner goto disconnect; 394191fd4dadSPhilipp Reisner } 394291fd4dadSPhilipp Reisner 39432ec91e0eSPhilipp Reisner *new_net_conf = *old_net_conf; 394491fd4dadSPhilipp Reisner 3945b411b363SPhilipp Reisner if (verify_tfm) { 39462ec91e0eSPhilipp Reisner strcpy(new_net_conf->verify_alg, p->verify_alg); 39472ec91e0eSPhilipp Reisner new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; 39489534d671SHerbert Xu crypto_free_ahash(peer_device->connection->verify_tfm); 39499f4fe9adSAndreas Gruenbacher peer_device->connection->verify_tfm = verify_tfm; 3950d0180171SAndreas Gruenbacher drbd_info(device, "using verify-alg: \"%s\"\n", p->verify_alg); 3951b411b363SPhilipp Reisner } 3952b411b363SPhilipp Reisner if (csums_tfm) { 39532ec91e0eSPhilipp Reisner strcpy(new_net_conf->csums_alg, p->csums_alg); 39542ec91e0eSPhilipp Reisner new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; 39559534d671SHerbert Xu crypto_free_ahash(peer_device->connection->csums_tfm); 39569f4fe9adSAndreas Gruenbacher peer_device->connection->csums_tfm = csums_tfm; 3957d0180171SAndreas Gruenbacher drbd_info(device, "using csums-alg: \"%s\"\n", p->csums_alg); 3958b411b363SPhilipp Reisner } 3959bde89a9eSAndreas Gruenbacher rcu_assign_pointer(connection->net_conf, new_net_conf); 3960778f271dSPhilipp Reisner } 3961b411b363SPhilipp Reisner } 3962b411b363SPhilipp Reisner 3963813472ceSPhilipp Reisner if (new_disk_conf) { 3964b30ab791SAndreas Gruenbacher rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); 3965b30ab791SAndreas Gruenbacher put_ldev(device); 3966b411b363SPhilipp Reisner } 3967813472ceSPhilipp Reisner 3968813472ceSPhilipp Reisner if (new_plan) { 3969b30ab791SAndreas Gruenbacher old_plan = device->rs_plan_s; 3970b30ab791SAndreas Gruenbacher rcu_assign_pointer(device->rs_plan_s, new_plan); 3971813472ceSPhilipp Reisner } 3972daeda1ccSPhilipp Reisner 39730500813fSAndreas Gruenbacher mutex_unlock(&connection->resource->conf_update); 3974daeda1ccSPhilipp Reisner synchronize_rcu(); 3975daeda1ccSPhilipp Reisner if (new_net_conf) 3976daeda1ccSPhilipp Reisner kfree(old_net_conf); 3977daeda1ccSPhilipp Reisner kfree(old_disk_conf); 3978813472ceSPhilipp Reisner kfree(old_plan); 3979daeda1ccSPhilipp Reisner 398082bc0194SAndreas Gruenbacher return 0; 3981b411b363SPhilipp Reisner 3982813472ceSPhilipp Reisner reconnect: 3983813472ceSPhilipp Reisner if (new_disk_conf) { 3984b30ab791SAndreas Gruenbacher put_ldev(device); 3985813472ceSPhilipp Reisner kfree(new_disk_conf); 3986813472ceSPhilipp Reisner } 39870500813fSAndreas Gruenbacher mutex_unlock(&connection->resource->conf_update); 3988813472ceSPhilipp Reisner return -EIO; 3989813472ceSPhilipp Reisner 3990b411b363SPhilipp Reisner disconnect: 3991813472ceSPhilipp Reisner kfree(new_plan); 3992813472ceSPhilipp Reisner if (new_disk_conf) { 3993b30ab791SAndreas Gruenbacher put_ldev(device); 3994813472ceSPhilipp Reisner kfree(new_disk_conf); 3995813472ceSPhilipp Reisner } 39960500813fSAndreas Gruenbacher mutex_unlock(&connection->resource->conf_update); 3997b411b363SPhilipp Reisner /* just for completeness: actually not needed, 3998b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 39999534d671SHerbert Xu crypto_free_ahash(csums_tfm); 4000b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 40019534d671SHerbert Xu crypto_free_ahash(verify_tfm); 40029f4fe9adSAndreas Gruenbacher conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); 400382bc0194SAndreas Gruenbacher return -EIO; 4004b411b363SPhilipp Reisner } 4005b411b363SPhilipp Reisner 4006b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 4007b30ab791SAndreas Gruenbacher static void warn_if_differ_considerably(struct drbd_device *device, 4008b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 4009b411b363SPhilipp Reisner { 4010b411b363SPhilipp Reisner sector_t d; 4011b411b363SPhilipp Reisner if (a == 0 || b == 0) 4012b411b363SPhilipp Reisner return; 4013b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 4014b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 4015d0180171SAndreas Gruenbacher drbd_warn(device, "Considerable difference in %s: %llus vs. %llus\n", s, 4016b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 4017b411b363SPhilipp Reisner } 4018b411b363SPhilipp Reisner 4019bde89a9eSAndreas Gruenbacher static int receive_sizes(struct drbd_connection *connection, struct packet_info *pi) 4020b411b363SPhilipp Reisner { 40219f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 4022b30ab791SAndreas Gruenbacher struct drbd_device *device; 4023e658983aSAndreas Gruenbacher struct p_sizes *p = pi->data; 40249104d31aSLars Ellenberg struct o_qlim *o = (connection->agreed_features & DRBD_FF_WSAME) ? p->qlim : NULL; 4025e96c9633SPhilipp Reisner enum determine_dev_size dd = DS_UNCHANGED; 40266a8d68b1SLars Ellenberg sector_t p_size, p_usize, p_csize, my_usize; 4027b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 4028e89b591cSPhilipp Reisner enum dds_flags ddsf; 4029b411b363SPhilipp Reisner 40309f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 40319f4fe9adSAndreas Gruenbacher if (!peer_device) 4032bde89a9eSAndreas Gruenbacher return config_unknown_volume(connection, pi); 40339f4fe9adSAndreas Gruenbacher device = peer_device->device; 40344a76b161SAndreas Gruenbacher 4035b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 4036b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 40376a8d68b1SLars Ellenberg p_csize = be64_to_cpu(p->c_size); 4038b411b363SPhilipp Reisner 4039b411b363SPhilipp Reisner /* just store the peer's disk size for now. 4040b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 4041b30ab791SAndreas Gruenbacher device->p_size = p_size; 4042b411b363SPhilipp Reisner 4043b30ab791SAndreas Gruenbacher if (get_ldev(device)) { 404460bac040SLars Ellenberg sector_t new_size, cur_size; 4045daeda1ccSPhilipp Reisner rcu_read_lock(); 4046b30ab791SAndreas Gruenbacher my_usize = rcu_dereference(device->ldev->disk_conf)->disk_size; 4047daeda1ccSPhilipp Reisner rcu_read_unlock(); 4048daeda1ccSPhilipp Reisner 4049b30ab791SAndreas Gruenbacher warn_if_differ_considerably(device, "lower level device sizes", 4050b30ab791SAndreas Gruenbacher p_size, drbd_get_max_capacity(device->ldev)); 4051b30ab791SAndreas Gruenbacher warn_if_differ_considerably(device, "user requested size", 4052daeda1ccSPhilipp Reisner p_usize, my_usize); 4053b411b363SPhilipp Reisner 4054b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 4055b411b363SPhilipp Reisner * param exchange, choose the minimum */ 4056b30ab791SAndreas Gruenbacher if (device->state.conn == C_WF_REPORT_PARAMS) 4057daeda1ccSPhilipp Reisner p_usize = min_not_zero(my_usize, p_usize); 4058b411b363SPhilipp Reisner 4059b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 4060b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 406160bac040SLars Ellenberg new_size = drbd_new_dev_size(device, device->ldev, p_usize, 0); 406260bac040SLars Ellenberg cur_size = drbd_get_capacity(device->this_bdev); 406360bac040SLars Ellenberg if (new_size < cur_size && 4064b30ab791SAndreas Gruenbacher device->state.disk >= D_OUTDATED && 4065b30ab791SAndreas Gruenbacher device->state.conn < C_CONNECTED) { 406660bac040SLars Ellenberg drbd_err(device, "The peer's disk size is too small! (%llu < %llu sectors)\n", 406760bac040SLars Ellenberg (unsigned long long)new_size, (unsigned long long)cur_size); 40689f4fe9adSAndreas Gruenbacher conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); 4069b30ab791SAndreas Gruenbacher put_ldev(device); 407082bc0194SAndreas Gruenbacher return -EIO; 4071b411b363SPhilipp Reisner } 4072daeda1ccSPhilipp Reisner 4073daeda1ccSPhilipp Reisner if (my_usize != p_usize) { 4074daeda1ccSPhilipp Reisner struct disk_conf *old_disk_conf, *new_disk_conf = NULL; 4075daeda1ccSPhilipp Reisner 4076daeda1ccSPhilipp Reisner new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); 4077daeda1ccSPhilipp Reisner if (!new_disk_conf) { 4078d0180171SAndreas Gruenbacher drbd_err(device, "Allocation of new disk_conf failed\n"); 4079b30ab791SAndreas Gruenbacher put_ldev(device); 4080daeda1ccSPhilipp Reisner return -ENOMEM; 4081daeda1ccSPhilipp Reisner } 4082daeda1ccSPhilipp Reisner 40830500813fSAndreas Gruenbacher mutex_lock(&connection->resource->conf_update); 4084b30ab791SAndreas Gruenbacher old_disk_conf = device->ldev->disk_conf; 4085daeda1ccSPhilipp Reisner *new_disk_conf = *old_disk_conf; 4086daeda1ccSPhilipp Reisner new_disk_conf->disk_size = p_usize; 4087daeda1ccSPhilipp Reisner 4088b30ab791SAndreas Gruenbacher rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); 40890500813fSAndreas Gruenbacher mutex_unlock(&connection->resource->conf_update); 4090daeda1ccSPhilipp Reisner synchronize_rcu(); 4091daeda1ccSPhilipp Reisner kfree(old_disk_conf); 4092daeda1ccSPhilipp Reisner 4093d0180171SAndreas Gruenbacher drbd_info(device, "Peer sets u_size to %lu sectors\n", 4094daeda1ccSPhilipp Reisner (unsigned long)my_usize); 4095daeda1ccSPhilipp Reisner } 4096daeda1ccSPhilipp Reisner 4097b30ab791SAndreas Gruenbacher put_ldev(device); 4098b411b363SPhilipp Reisner } 4099b411b363SPhilipp Reisner 410020c68fdeSLars Ellenberg device->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 4101dd4f699dSLars Ellenberg /* Leave drbd_reconsider_queue_parameters() before drbd_determine_dev_size(). 410220c68fdeSLars Ellenberg In case we cleared the QUEUE_FLAG_DISCARD from our queue in 4103dd4f699dSLars Ellenberg drbd_reconsider_queue_parameters(), we can be sure that after 410420c68fdeSLars Ellenberg drbd_determine_dev_size() no REQ_DISCARDs are in the queue. */ 410520c68fdeSLars Ellenberg 4106e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 4107b30ab791SAndreas Gruenbacher if (get_ldev(device)) { 41089104d31aSLars Ellenberg drbd_reconsider_queue_parameters(device, device->ldev, o); 4109b30ab791SAndreas Gruenbacher dd = drbd_determine_dev_size(device, ddsf, NULL); 4110b30ab791SAndreas Gruenbacher put_ldev(device); 4111e96c9633SPhilipp Reisner if (dd == DS_ERROR) 411282bc0194SAndreas Gruenbacher return -EIO; 4113b30ab791SAndreas Gruenbacher drbd_md_sync(device); 4114b411b363SPhilipp Reisner } else { 41156a8d68b1SLars Ellenberg /* 41166a8d68b1SLars Ellenberg * I am diskless, need to accept the peer's *current* size. 41176a8d68b1SLars Ellenberg * I must NOT accept the peers backing disk size, 41186a8d68b1SLars Ellenberg * it may have been larger than mine all along... 41196a8d68b1SLars Ellenberg * 41206a8d68b1SLars Ellenberg * At this point, the peer knows more about my disk, or at 41216a8d68b1SLars Ellenberg * least about what we last agreed upon, than myself. 41226a8d68b1SLars Ellenberg * So if his c_size is less than his d_size, the most likely 41236a8d68b1SLars Ellenberg * reason is that *my* d_size was smaller last time we checked. 41246a8d68b1SLars Ellenberg * 41256a8d68b1SLars Ellenberg * However, if he sends a zero current size, 41266a8d68b1SLars Ellenberg * take his (user-capped or) backing disk size anyways. 41276a8d68b1SLars Ellenberg */ 41289104d31aSLars Ellenberg drbd_reconsider_queue_parameters(device, NULL, o); 41296a8d68b1SLars Ellenberg drbd_set_my_capacity(device, p_csize ?: p_usize ?: p_size); 4130b411b363SPhilipp Reisner } 4131b411b363SPhilipp Reisner 4132b30ab791SAndreas Gruenbacher if (get_ldev(device)) { 4133b30ab791SAndreas Gruenbacher if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev)) { 4134b30ab791SAndreas Gruenbacher device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev); 4135b411b363SPhilipp Reisner ldsc = 1; 4136b411b363SPhilipp Reisner } 4137b411b363SPhilipp Reisner 4138b30ab791SAndreas Gruenbacher put_ldev(device); 4139b411b363SPhilipp Reisner } 4140b411b363SPhilipp Reisner 4141b30ab791SAndreas Gruenbacher if (device->state.conn > C_WF_REPORT_PARAMS) { 4142b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 4143b30ab791SAndreas Gruenbacher drbd_get_capacity(device->this_bdev) || ldsc) { 4144b411b363SPhilipp Reisner /* we have different sizes, probably peer 4145b411b363SPhilipp Reisner * needs to know my new size... */ 414669a22773SAndreas Gruenbacher drbd_send_sizes(peer_device, 0, ddsf); 4147b411b363SPhilipp Reisner } 4148b30ab791SAndreas Gruenbacher if (test_and_clear_bit(RESIZE_PENDING, &device->flags) || 4149b30ab791SAndreas Gruenbacher (dd == DS_GREW && device->state.conn == C_CONNECTED)) { 4150b30ab791SAndreas Gruenbacher if (device->state.pdsk >= D_INCONSISTENT && 4151b30ab791SAndreas Gruenbacher device->state.disk >= D_INCONSISTENT) { 4152e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 4153d0180171SAndreas Gruenbacher drbd_info(device, "Resync of new storage suppressed with --assume-clean\n"); 4154b411b363SPhilipp Reisner else 4155b30ab791SAndreas Gruenbacher resync_after_online_grow(device); 4156e89b591cSPhilipp Reisner } else 4157b30ab791SAndreas Gruenbacher set_bit(RESYNC_AFTER_NEG, &device->flags); 4158b411b363SPhilipp Reisner } 4159b411b363SPhilipp Reisner } 4160b411b363SPhilipp Reisner 416182bc0194SAndreas Gruenbacher return 0; 4162b411b363SPhilipp Reisner } 4163b411b363SPhilipp Reisner 4164bde89a9eSAndreas Gruenbacher static int receive_uuids(struct drbd_connection *connection, struct packet_info *pi) 4165b411b363SPhilipp Reisner { 41669f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 4167b30ab791SAndreas Gruenbacher struct drbd_device *device; 4168e658983aSAndreas Gruenbacher struct p_uuids *p = pi->data; 4169b411b363SPhilipp Reisner u64 *p_uuid; 417062b0da3aSLars Ellenberg int i, updated_uuids = 0; 4171b411b363SPhilipp Reisner 41729f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 41739f4fe9adSAndreas Gruenbacher if (!peer_device) 4174bde89a9eSAndreas Gruenbacher return config_unknown_volume(connection, pi); 41759f4fe9adSAndreas Gruenbacher device = peer_device->device; 41764a76b161SAndreas Gruenbacher 4177b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 4178063eacf8SJing Wang if (!p_uuid) { 4179d0180171SAndreas Gruenbacher drbd_err(device, "kmalloc of p_uuid failed\n"); 4180063eacf8SJing Wang return false; 4181063eacf8SJing Wang } 4182b411b363SPhilipp Reisner 4183b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 4184b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 4185b411b363SPhilipp Reisner 4186b30ab791SAndreas Gruenbacher kfree(device->p_uuid); 4187b30ab791SAndreas Gruenbacher device->p_uuid = p_uuid; 4188b411b363SPhilipp Reisner 4189b30ab791SAndreas Gruenbacher if (device->state.conn < C_CONNECTED && 4190b30ab791SAndreas Gruenbacher device->state.disk < D_INCONSISTENT && 4191b30ab791SAndreas Gruenbacher device->state.role == R_PRIMARY && 4192b30ab791SAndreas Gruenbacher (device->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 4193d0180171SAndreas Gruenbacher drbd_err(device, "Can only connect to data with current UUID=%016llX\n", 4194b30ab791SAndreas Gruenbacher (unsigned long long)device->ed_uuid); 41959f4fe9adSAndreas Gruenbacher conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); 419682bc0194SAndreas Gruenbacher return -EIO; 4197b411b363SPhilipp Reisner } 4198b411b363SPhilipp Reisner 4199b30ab791SAndreas Gruenbacher if (get_ldev(device)) { 4200b411b363SPhilipp Reisner int skip_initial_sync = 4201b30ab791SAndreas Gruenbacher device->state.conn == C_CONNECTED && 42029f4fe9adSAndreas Gruenbacher peer_device->connection->agreed_pro_version >= 90 && 4203b30ab791SAndreas Gruenbacher device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 4204b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 4205b411b363SPhilipp Reisner if (skip_initial_sync) { 4206d0180171SAndreas Gruenbacher drbd_info(device, "Accepted new current UUID, preparing to skip initial sync\n"); 4207b30ab791SAndreas Gruenbacher drbd_bitmap_io(device, &drbd_bmio_clear_n_write, 420820ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 420920ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 4210b30ab791SAndreas Gruenbacher _drbd_uuid_set(device, UI_CURRENT, p_uuid[UI_CURRENT]); 4211b30ab791SAndreas Gruenbacher _drbd_uuid_set(device, UI_BITMAP, 0); 4212b30ab791SAndreas Gruenbacher _drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 4213b411b363SPhilipp Reisner CS_VERBOSE, NULL); 4214b30ab791SAndreas Gruenbacher drbd_md_sync(device); 421562b0da3aSLars Ellenberg updated_uuids = 1; 4216b411b363SPhilipp Reisner } 4217b30ab791SAndreas Gruenbacher put_ldev(device); 4218b30ab791SAndreas Gruenbacher } else if (device->state.disk < D_INCONSISTENT && 4219b30ab791SAndreas Gruenbacher device->state.role == R_PRIMARY) { 422018a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 422118a50fa2SPhilipp Reisner for me. */ 4222b30ab791SAndreas Gruenbacher updated_uuids = drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]); 4223b411b363SPhilipp Reisner } 4224b411b363SPhilipp Reisner 4225b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 4226b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 4227b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 4228b411b363SPhilipp Reisner new disk state... */ 4229b30ab791SAndreas Gruenbacher mutex_lock(device->state_mutex); 4230b30ab791SAndreas Gruenbacher mutex_unlock(device->state_mutex); 4231b30ab791SAndreas Gruenbacher if (device->state.conn >= C_CONNECTED && device->state.disk < D_INCONSISTENT) 4232b30ab791SAndreas Gruenbacher updated_uuids |= drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]); 423362b0da3aSLars Ellenberg 423462b0da3aSLars Ellenberg if (updated_uuids) 4235b30ab791SAndreas Gruenbacher drbd_print_uuids(device, "receiver updated UUIDs to"); 4236b411b363SPhilipp Reisner 423782bc0194SAndreas Gruenbacher return 0; 4238b411b363SPhilipp Reisner } 4239b411b363SPhilipp Reisner 4240b411b363SPhilipp Reisner /** 4241b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 4242b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 4243b411b363SPhilipp Reisner */ 4244b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 4245b411b363SPhilipp Reisner { 4246b411b363SPhilipp Reisner union drbd_state ms; 4247b411b363SPhilipp Reisner 4248b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 4249369bea63SPhilipp Reisner [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, 4250b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 4251b411b363SPhilipp Reisner 4252b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 4253b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 4254b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 4255b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 4256b411b363SPhilipp Reisner [C_MASK] = C_MASK, 4257b411b363SPhilipp Reisner }; 4258b411b363SPhilipp Reisner 4259b411b363SPhilipp Reisner ms.i = ps.i; 4260b411b363SPhilipp Reisner 4261b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 4262b411b363SPhilipp Reisner ms.peer = ps.role; 4263b411b363SPhilipp Reisner ms.role = ps.peer; 4264b411b363SPhilipp Reisner ms.pdsk = ps.disk; 4265b411b363SPhilipp Reisner ms.disk = ps.pdsk; 4266b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 4267b411b363SPhilipp Reisner 4268b411b363SPhilipp Reisner return ms; 4269b411b363SPhilipp Reisner } 4270b411b363SPhilipp Reisner 4271bde89a9eSAndreas Gruenbacher static int receive_req_state(struct drbd_connection *connection, struct packet_info *pi) 4272b411b363SPhilipp Reisner { 42739f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 4274b30ab791SAndreas Gruenbacher struct drbd_device *device; 4275e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 4276b411b363SPhilipp Reisner union drbd_state mask, val; 4277bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 4278b411b363SPhilipp Reisner 42799f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 42809f4fe9adSAndreas Gruenbacher if (!peer_device) 42814a76b161SAndreas Gruenbacher return -EIO; 42829f4fe9adSAndreas Gruenbacher device = peer_device->device; 42834a76b161SAndreas Gruenbacher 4284b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 4285b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 4286b411b363SPhilipp Reisner 42879f4fe9adSAndreas Gruenbacher if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) && 4288b30ab791SAndreas Gruenbacher mutex_is_locked(device->state_mutex)) { 428969a22773SAndreas Gruenbacher drbd_send_sr_reply(peer_device, SS_CONCURRENT_ST_CHG); 429082bc0194SAndreas Gruenbacher return 0; 4291b411b363SPhilipp Reisner } 4292b411b363SPhilipp Reisner 4293b411b363SPhilipp Reisner mask = convert_state(mask); 4294b411b363SPhilipp Reisner val = convert_state(val); 4295b411b363SPhilipp Reisner 4296b30ab791SAndreas Gruenbacher rv = drbd_change_state(device, CS_VERBOSE, mask, val); 429769a22773SAndreas Gruenbacher drbd_send_sr_reply(peer_device, rv); 4298047cd4a6SPhilipp Reisner 4299b30ab791SAndreas Gruenbacher drbd_md_sync(device); 4300b411b363SPhilipp Reisner 430182bc0194SAndreas Gruenbacher return 0; 4302b411b363SPhilipp Reisner } 4303b411b363SPhilipp Reisner 4304bde89a9eSAndreas Gruenbacher static int receive_req_conn_state(struct drbd_connection *connection, struct packet_info *pi) 4305b411b363SPhilipp Reisner { 4306e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 4307dfafcc8aSPhilipp Reisner union drbd_state mask, val; 4308dfafcc8aSPhilipp Reisner enum drbd_state_rv rv; 4309dfafcc8aSPhilipp Reisner 4310dfafcc8aSPhilipp Reisner mask.i = be32_to_cpu(p->mask); 4311dfafcc8aSPhilipp Reisner val.i = be32_to_cpu(p->val); 4312dfafcc8aSPhilipp Reisner 4313bde89a9eSAndreas Gruenbacher if (test_bit(RESOLVE_CONFLICTS, &connection->flags) && 4314bde89a9eSAndreas Gruenbacher mutex_is_locked(&connection->cstate_mutex)) { 4315bde89a9eSAndreas Gruenbacher conn_send_sr_reply(connection, SS_CONCURRENT_ST_CHG); 431682bc0194SAndreas Gruenbacher return 0; 4317dfafcc8aSPhilipp Reisner } 4318dfafcc8aSPhilipp Reisner 4319dfafcc8aSPhilipp Reisner mask = convert_state(mask); 4320dfafcc8aSPhilipp Reisner val = convert_state(val); 4321dfafcc8aSPhilipp Reisner 4322bde89a9eSAndreas Gruenbacher rv = conn_request_state(connection, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); 4323bde89a9eSAndreas Gruenbacher conn_send_sr_reply(connection, rv); 4324dfafcc8aSPhilipp Reisner 432582bc0194SAndreas Gruenbacher return 0; 4326dfafcc8aSPhilipp Reisner } 4327dfafcc8aSPhilipp Reisner 4328bde89a9eSAndreas Gruenbacher static int receive_state(struct drbd_connection *connection, struct packet_info *pi) 4329b411b363SPhilipp Reisner { 43309f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 4331b30ab791SAndreas Gruenbacher struct drbd_device *device; 4332e658983aSAndreas Gruenbacher struct p_state *p = pi->data; 43334ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 4334b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 433565d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 4336b411b363SPhilipp Reisner int rv; 4337b411b363SPhilipp Reisner 43389f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 43399f4fe9adSAndreas Gruenbacher if (!peer_device) 4340bde89a9eSAndreas Gruenbacher return config_unknown_volume(connection, pi); 43419f4fe9adSAndreas Gruenbacher device = peer_device->device; 43424a76b161SAndreas Gruenbacher 4343b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 4344b411b363SPhilipp Reisner 4345b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 4346b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 4347b30ab791SAndreas Gruenbacher real_peer_disk = device->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 4348d0180171SAndreas Gruenbacher drbd_info(device, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 4349b411b363SPhilipp Reisner } 4350b411b363SPhilipp Reisner 43510500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 4352b411b363SPhilipp Reisner retry: 4353b30ab791SAndreas Gruenbacher os = ns = drbd_read_state(device); 43540500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 4355b411b363SPhilipp Reisner 4356668700b4SPhilipp Reisner /* If some other part of the code (ack_receiver thread, timeout) 4357545752d5SLars Ellenberg * already decided to close the connection again, 4358545752d5SLars Ellenberg * we must not "re-establish" it here. */ 4359545752d5SLars Ellenberg if (os.conn <= C_TEAR_DOWN) 436058ffa580SLars Ellenberg return -ECONNRESET; 4361545752d5SLars Ellenberg 436240424e4aSLars Ellenberg /* If this is the "end of sync" confirmation, usually the peer disk 436340424e4aSLars Ellenberg * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits 436440424e4aSLars Ellenberg * set) resync started in PausedSyncT, or if the timing of pause-/ 436540424e4aSLars Ellenberg * unpause-sync events has been "just right", the peer disk may 436640424e4aSLars Ellenberg * transition from D_CONSISTENT to D_UP_TO_DATE as well. 436740424e4aSLars Ellenberg */ 436840424e4aSLars Ellenberg if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && 436940424e4aSLars Ellenberg real_peer_disk == D_UP_TO_DATE && 4370e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 4371e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 4372e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 4373e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 4374e9ef7bb6SLars Ellenberg * syncing states. 4375e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 4376e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 4377e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 4378e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 4379e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 4380e9ef7bb6SLars Ellenberg 4381e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 4382e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 4383e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 4384e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 4385e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 4386b30ab791SAndreas Gruenbacher if (drbd_bm_total_weight(device) <= device->rs_failed) 4387b30ab791SAndreas Gruenbacher drbd_resync_finished(device); 438882bc0194SAndreas Gruenbacher return 0; 4389e9ef7bb6SLars Ellenberg } 4390e9ef7bb6SLars Ellenberg } 4391e9ef7bb6SLars Ellenberg 439202b91b55SLars Ellenberg /* explicit verify finished notification, stop sector reached. */ 439302b91b55SLars Ellenberg if (os.conn == C_VERIFY_T && os.disk == D_UP_TO_DATE && 439402b91b55SLars Ellenberg peer_state.conn == C_CONNECTED && real_peer_disk == D_UP_TO_DATE) { 4395b30ab791SAndreas Gruenbacher ov_out_of_sync_print(device); 4396b30ab791SAndreas Gruenbacher drbd_resync_finished(device); 439758ffa580SLars Ellenberg return 0; 439802b91b55SLars Ellenberg } 439902b91b55SLars Ellenberg 4400e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 4401e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 4402e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 4403e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 4404e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 4405e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 4406e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 4407e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 4408e9ef7bb6SLars Ellenberg 44094ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 44104ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 4411b411b363SPhilipp Reisner 441267531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 441367531718SPhilipp Reisner ns.conn = C_BEHIND; 441467531718SPhilipp Reisner 4415b30ab791SAndreas Gruenbacher if (device->p_uuid && peer_state.disk >= D_NEGOTIATING && 4416b30ab791SAndreas Gruenbacher get_ldev_if_state(device, D_NEGOTIATING)) { 4417b411b363SPhilipp Reisner int cr; /* consider resync */ 4418b411b363SPhilipp Reisner 4419b411b363SPhilipp Reisner /* if we established a new connection */ 44204ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 4421b411b363SPhilipp Reisner /* if we had an established connection 4422b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 44234ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 4424b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 44254ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 4426b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 4427b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 4428b30ab791SAndreas Gruenbacher cr |= test_bit(CONSIDER_RESYNC, &device->flags); 4429b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 4430b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 44314ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 4432b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 4433b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 4434b411b363SPhilipp Reisner 4435b411b363SPhilipp Reisner if (cr) 443669a22773SAndreas Gruenbacher ns.conn = drbd_sync_handshake(peer_device, peer_state.role, real_peer_disk); 4437b411b363SPhilipp Reisner 4438b30ab791SAndreas Gruenbacher put_ldev(device); 44394ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 44404ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 4441b30ab791SAndreas Gruenbacher if (device->state.disk == D_NEGOTIATING) { 4442b30ab791SAndreas Gruenbacher drbd_force_state(device, NS(disk, D_FAILED)); 4443b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 4444d0180171SAndreas Gruenbacher drbd_err(device, "Disk attach process on the peer node was aborted.\n"); 4445b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 4446580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 4447b411b363SPhilipp Reisner } else { 44489f4fe9adSAndreas Gruenbacher if (test_and_clear_bit(CONN_DRY_RUN, &peer_device->connection->flags)) 444982bc0194SAndreas Gruenbacher return -EIO; 44500b0ba1efSAndreas Gruenbacher D_ASSERT(device, os.conn == C_WF_REPORT_PARAMS); 44519f4fe9adSAndreas Gruenbacher conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); 445282bc0194SAndreas Gruenbacher return -EIO; 4453b411b363SPhilipp Reisner } 4454b411b363SPhilipp Reisner } 4455b411b363SPhilipp Reisner } 4456b411b363SPhilipp Reisner 44570500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 4458b30ab791SAndreas Gruenbacher if (os.i != drbd_read_state(device).i) 4459b411b363SPhilipp Reisner goto retry; 4460b30ab791SAndreas Gruenbacher clear_bit(CONSIDER_RESYNC, &device->flags); 4461b411b363SPhilipp Reisner ns.peer = peer_state.role; 4462b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 4463b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 44644ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 4465b30ab791SAndreas Gruenbacher ns.disk = device->new_state_tmp.disk; 44664ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 4467b30ab791SAndreas Gruenbacher if (ns.pdsk == D_CONSISTENT && drbd_suspended(device) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 4468b30ab791SAndreas Gruenbacher test_bit(NEW_CUR_UUID, &device->flags)) { 44698554df1cSAndreas Gruenbacher /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this 4470481c6f50SPhilipp Reisner for temporal network outages! */ 44710500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 4472d0180171SAndreas Gruenbacher drbd_err(device, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 44739f4fe9adSAndreas Gruenbacher tl_clear(peer_device->connection); 4474b30ab791SAndreas Gruenbacher drbd_uuid_new_current(device); 4475b30ab791SAndreas Gruenbacher clear_bit(NEW_CUR_UUID, &device->flags); 44769f4fe9adSAndreas Gruenbacher conn_request_state(peer_device->connection, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); 447782bc0194SAndreas Gruenbacher return -EIO; 4478481c6f50SPhilipp Reisner } 4479b30ab791SAndreas Gruenbacher rv = _drbd_set_state(device, ns, cs_flags, NULL); 4480b30ab791SAndreas Gruenbacher ns = drbd_read_state(device); 44810500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 4482b411b363SPhilipp Reisner 4483b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 44849f4fe9adSAndreas Gruenbacher conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); 448582bc0194SAndreas Gruenbacher return -EIO; 4486b411b363SPhilipp Reisner } 4487b411b363SPhilipp Reisner 44884ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 44894ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 4490b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 4491b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 4492b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 4493b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 449469a22773SAndreas Gruenbacher drbd_send_uuids(peer_device); 449569a22773SAndreas Gruenbacher drbd_send_current_state(peer_device); 4496b411b363SPhilipp Reisner } 4497b411b363SPhilipp Reisner } 4498b411b363SPhilipp Reisner 4499b30ab791SAndreas Gruenbacher clear_bit(DISCARD_MY_DATA, &device->flags); 4500b411b363SPhilipp Reisner 4501b30ab791SAndreas Gruenbacher drbd_md_sync(device); /* update connected indicator, la_size_sect, ... */ 4502b411b363SPhilipp Reisner 450382bc0194SAndreas Gruenbacher return 0; 4504b411b363SPhilipp Reisner } 4505b411b363SPhilipp Reisner 4506bde89a9eSAndreas Gruenbacher static int receive_sync_uuid(struct drbd_connection *connection, struct packet_info *pi) 4507b411b363SPhilipp Reisner { 45089f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 4509b30ab791SAndreas Gruenbacher struct drbd_device *device; 4510e658983aSAndreas Gruenbacher struct p_rs_uuid *p = pi->data; 45114a76b161SAndreas Gruenbacher 45129f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 45139f4fe9adSAndreas Gruenbacher if (!peer_device) 45144a76b161SAndreas Gruenbacher return -EIO; 45159f4fe9adSAndreas Gruenbacher device = peer_device->device; 4516b411b363SPhilipp Reisner 4517b30ab791SAndreas Gruenbacher wait_event(device->misc_wait, 4518b30ab791SAndreas Gruenbacher device->state.conn == C_WF_SYNC_UUID || 4519b30ab791SAndreas Gruenbacher device->state.conn == C_BEHIND || 4520b30ab791SAndreas Gruenbacher device->state.conn < C_CONNECTED || 4521b30ab791SAndreas Gruenbacher device->state.disk < D_NEGOTIATING); 4522b411b363SPhilipp Reisner 45230b0ba1efSAndreas Gruenbacher /* D_ASSERT(device, device->state.conn == C_WF_SYNC_UUID ); */ 4524b411b363SPhilipp Reisner 4525b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 4526b411b363SPhilipp Reisner _not_ be rotated into the history */ 4527b30ab791SAndreas Gruenbacher if (get_ldev_if_state(device, D_NEGOTIATING)) { 4528b30ab791SAndreas Gruenbacher _drbd_uuid_set(device, UI_CURRENT, be64_to_cpu(p->uuid)); 4529b30ab791SAndreas Gruenbacher _drbd_uuid_set(device, UI_BITMAP, 0UL); 4530b411b363SPhilipp Reisner 4531b30ab791SAndreas Gruenbacher drbd_print_uuids(device, "updated sync uuid"); 4532b30ab791SAndreas Gruenbacher drbd_start_resync(device, C_SYNC_TARGET); 4533b411b363SPhilipp Reisner 4534b30ab791SAndreas Gruenbacher put_ldev(device); 4535b411b363SPhilipp Reisner } else 4536d0180171SAndreas Gruenbacher drbd_err(device, "Ignoring SyncUUID packet!\n"); 4537b411b363SPhilipp Reisner 453882bc0194SAndreas Gruenbacher return 0; 4539b411b363SPhilipp Reisner } 4540b411b363SPhilipp Reisner 45412c46407dSAndreas Gruenbacher /** 45422c46407dSAndreas Gruenbacher * receive_bitmap_plain 45432c46407dSAndreas Gruenbacher * 45442c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 45452c46407dSAndreas Gruenbacher * code upon failure. 45462c46407dSAndreas Gruenbacher */ 45472c46407dSAndreas Gruenbacher static int 454869a22773SAndreas Gruenbacher receive_bitmap_plain(struct drbd_peer_device *peer_device, unsigned int size, 4549e658983aSAndreas Gruenbacher unsigned long *p, struct bm_xfer_ctx *c) 4550b411b363SPhilipp Reisner { 455150d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - 455269a22773SAndreas Gruenbacher drbd_header_size(peer_device->connection); 4553e658983aSAndreas Gruenbacher unsigned int num_words = min_t(size_t, data_size / sizeof(*p), 455450d0b1adSAndreas Gruenbacher c->bm_words - c->word_offset); 4555e658983aSAndreas Gruenbacher unsigned int want = num_words * sizeof(*p); 45562c46407dSAndreas Gruenbacher int err; 4557b411b363SPhilipp Reisner 455850d0b1adSAndreas Gruenbacher if (want != size) { 455969a22773SAndreas Gruenbacher drbd_err(peer_device, "%s:want (%u) != size (%u)\n", __func__, want, size); 45602c46407dSAndreas Gruenbacher return -EIO; 4561b411b363SPhilipp Reisner } 4562b411b363SPhilipp Reisner if (want == 0) 45632c46407dSAndreas Gruenbacher return 0; 456469a22773SAndreas Gruenbacher err = drbd_recv_all(peer_device->connection, p, want); 456582bc0194SAndreas Gruenbacher if (err) 45662c46407dSAndreas Gruenbacher return err; 4567b411b363SPhilipp Reisner 456869a22773SAndreas Gruenbacher drbd_bm_merge_lel(peer_device->device, c->word_offset, num_words, p); 4569b411b363SPhilipp Reisner 4570b411b363SPhilipp Reisner c->word_offset += num_words; 4571b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 4572b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 4573b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 4574b411b363SPhilipp Reisner 45752c46407dSAndreas Gruenbacher return 1; 4576b411b363SPhilipp Reisner } 4577b411b363SPhilipp Reisner 4578a02d1240SAndreas Gruenbacher static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) 4579a02d1240SAndreas Gruenbacher { 4580a02d1240SAndreas Gruenbacher return (enum drbd_bitmap_code)(p->encoding & 0x0f); 4581a02d1240SAndreas Gruenbacher } 4582a02d1240SAndreas Gruenbacher 4583a02d1240SAndreas Gruenbacher static int dcbp_get_start(struct p_compressed_bm *p) 4584a02d1240SAndreas Gruenbacher { 4585a02d1240SAndreas Gruenbacher return (p->encoding & 0x80) != 0; 4586a02d1240SAndreas Gruenbacher } 4587a02d1240SAndreas Gruenbacher 4588a02d1240SAndreas Gruenbacher static int dcbp_get_pad_bits(struct p_compressed_bm *p) 4589a02d1240SAndreas Gruenbacher { 4590a02d1240SAndreas Gruenbacher return (p->encoding >> 4) & 0x7; 4591a02d1240SAndreas Gruenbacher } 4592a02d1240SAndreas Gruenbacher 45932c46407dSAndreas Gruenbacher /** 45942c46407dSAndreas Gruenbacher * recv_bm_rle_bits 45952c46407dSAndreas Gruenbacher * 45962c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 45972c46407dSAndreas Gruenbacher * code upon failure. 45982c46407dSAndreas Gruenbacher */ 45992c46407dSAndreas Gruenbacher static int 460069a22773SAndreas Gruenbacher recv_bm_rle_bits(struct drbd_peer_device *peer_device, 4601b411b363SPhilipp Reisner struct p_compressed_bm *p, 4602c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 4603c6d25cfeSPhilipp Reisner unsigned int len) 4604b411b363SPhilipp Reisner { 4605b411b363SPhilipp Reisner struct bitstream bs; 4606b411b363SPhilipp Reisner u64 look_ahead; 4607b411b363SPhilipp Reisner u64 rl; 4608b411b363SPhilipp Reisner u64 tmp; 4609b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 4610b411b363SPhilipp Reisner unsigned long e; 4611a02d1240SAndreas Gruenbacher int toggle = dcbp_get_start(p); 4612b411b363SPhilipp Reisner int have; 4613b411b363SPhilipp Reisner int bits; 4614b411b363SPhilipp Reisner 4615a02d1240SAndreas Gruenbacher bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); 4616b411b363SPhilipp Reisner 4617b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 4618b411b363SPhilipp Reisner if (bits < 0) 46192c46407dSAndreas Gruenbacher return -EIO; 4620b411b363SPhilipp Reisner 4621b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 4622b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 4623b411b363SPhilipp Reisner if (bits <= 0) 46242c46407dSAndreas Gruenbacher return -EIO; 4625b411b363SPhilipp Reisner 4626b411b363SPhilipp Reisner if (toggle) { 4627b411b363SPhilipp Reisner e = s + rl -1; 4628b411b363SPhilipp Reisner if (e >= c->bm_bits) { 462969a22773SAndreas Gruenbacher drbd_err(peer_device, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 46302c46407dSAndreas Gruenbacher return -EIO; 4631b411b363SPhilipp Reisner } 463269a22773SAndreas Gruenbacher _drbd_bm_set_bits(peer_device->device, s, e); 4633b411b363SPhilipp Reisner } 4634b411b363SPhilipp Reisner 4635b411b363SPhilipp Reisner if (have < bits) { 463669a22773SAndreas Gruenbacher drbd_err(peer_device, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 4637b411b363SPhilipp Reisner have, bits, look_ahead, 4638b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 4639b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 46402c46407dSAndreas Gruenbacher return -EIO; 4641b411b363SPhilipp Reisner } 4642d2da5b0cSLars Ellenberg /* if we consumed all 64 bits, assign 0; >> 64 is "undefined"; */ 4643d2da5b0cSLars Ellenberg if (likely(bits < 64)) 4644b411b363SPhilipp Reisner look_ahead >>= bits; 4645d2da5b0cSLars Ellenberg else 4646d2da5b0cSLars Ellenberg look_ahead = 0; 4647b411b363SPhilipp Reisner have -= bits; 4648b411b363SPhilipp Reisner 4649b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 4650b411b363SPhilipp Reisner if (bits < 0) 46512c46407dSAndreas Gruenbacher return -EIO; 4652b411b363SPhilipp Reisner look_ahead |= tmp << have; 4653b411b363SPhilipp Reisner have += bits; 4654b411b363SPhilipp Reisner } 4655b411b363SPhilipp Reisner 4656b411b363SPhilipp Reisner c->bit_offset = s; 4657b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 4658b411b363SPhilipp Reisner 46592c46407dSAndreas Gruenbacher return (s != c->bm_bits); 4660b411b363SPhilipp Reisner } 4661b411b363SPhilipp Reisner 46622c46407dSAndreas Gruenbacher /** 46632c46407dSAndreas Gruenbacher * decode_bitmap_c 46642c46407dSAndreas Gruenbacher * 46652c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 46662c46407dSAndreas Gruenbacher * code upon failure. 46672c46407dSAndreas Gruenbacher */ 46682c46407dSAndreas Gruenbacher static int 466969a22773SAndreas Gruenbacher decode_bitmap_c(struct drbd_peer_device *peer_device, 4670b411b363SPhilipp Reisner struct p_compressed_bm *p, 4671c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 4672c6d25cfeSPhilipp Reisner unsigned int len) 4673b411b363SPhilipp Reisner { 4674a02d1240SAndreas Gruenbacher if (dcbp_get_code(p) == RLE_VLI_Bits) 467569a22773SAndreas Gruenbacher return recv_bm_rle_bits(peer_device, p, c, len - sizeof(*p)); 4676b411b363SPhilipp Reisner 4677b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 4678b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 4679b411b363SPhilipp Reisner * during all our tests. */ 4680b411b363SPhilipp Reisner 468169a22773SAndreas Gruenbacher drbd_err(peer_device, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 468269a22773SAndreas Gruenbacher conn_request_state(peer_device->connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 46832c46407dSAndreas Gruenbacher return -EIO; 4684b411b363SPhilipp Reisner } 4685b411b363SPhilipp Reisner 4686b30ab791SAndreas Gruenbacher void INFO_bm_xfer_stats(struct drbd_device *device, 4687b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 4688b411b363SPhilipp Reisner { 4689b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 4690a6b32bc3SAndreas Gruenbacher unsigned int header_size = drbd_header_size(first_peer_device(device)->connection); 469150d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; 469250d0b1adSAndreas Gruenbacher unsigned int plain = 469350d0b1adSAndreas Gruenbacher header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + 469450d0b1adSAndreas Gruenbacher c->bm_words * sizeof(unsigned long); 469550d0b1adSAndreas Gruenbacher unsigned int total = c->bytes[0] + c->bytes[1]; 469650d0b1adSAndreas Gruenbacher unsigned int r; 4697b411b363SPhilipp Reisner 4698b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 4699b411b363SPhilipp Reisner if (total == 0) 4700b411b363SPhilipp Reisner return; 4701b411b363SPhilipp Reisner 4702b411b363SPhilipp Reisner /* don't report if not compressed */ 4703b411b363SPhilipp Reisner if (total >= plain) 4704b411b363SPhilipp Reisner return; 4705b411b363SPhilipp Reisner 4706b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 4707b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 4708b411b363SPhilipp Reisner : (1000 * total / plain); 4709b411b363SPhilipp Reisner 4710b411b363SPhilipp Reisner if (r > 1000) 4711b411b363SPhilipp Reisner r = 1000; 4712b411b363SPhilipp Reisner 4713b411b363SPhilipp Reisner r = 1000 - r; 4714d0180171SAndreas Gruenbacher drbd_info(device, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 4715b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 4716b411b363SPhilipp Reisner direction, 4717b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 4718b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 4719b411b363SPhilipp Reisner total, r/10, r % 10); 4720b411b363SPhilipp Reisner } 4721b411b363SPhilipp Reisner 4722b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 4723b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 4724b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 4725b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 4726b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 4727b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 4728b411b363SPhilipp Reisner 4729b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 4730bde89a9eSAndreas Gruenbacher static int receive_bitmap(struct drbd_connection *connection, struct packet_info *pi) 4731b411b363SPhilipp Reisner { 47329f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 4733b30ab791SAndreas Gruenbacher struct drbd_device *device; 4734b411b363SPhilipp Reisner struct bm_xfer_ctx c; 47352c46407dSAndreas Gruenbacher int err; 47364a76b161SAndreas Gruenbacher 47379f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 47389f4fe9adSAndreas Gruenbacher if (!peer_device) 47394a76b161SAndreas Gruenbacher return -EIO; 47409f4fe9adSAndreas Gruenbacher device = peer_device->device; 4741b411b363SPhilipp Reisner 4742b30ab791SAndreas Gruenbacher drbd_bm_lock(device, "receive bitmap", BM_LOCKED_SET_ALLOWED); 474320ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 474420ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 4745b411b363SPhilipp Reisner 4746b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 4747b30ab791SAndreas Gruenbacher .bm_bits = drbd_bm_bits(device), 4748b30ab791SAndreas Gruenbacher .bm_words = drbd_bm_words(device), 4749b411b363SPhilipp Reisner }; 4750b411b363SPhilipp Reisner 47512c46407dSAndreas Gruenbacher for(;;) { 4752e658983aSAndreas Gruenbacher if (pi->cmd == P_BITMAP) 475369a22773SAndreas Gruenbacher err = receive_bitmap_plain(peer_device, pi->size, pi->data, &c); 4754e658983aSAndreas Gruenbacher else if (pi->cmd == P_COMPRESSED_BITMAP) { 4755b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 4756b411b363SPhilipp Reisner * and the feature is enabled! */ 4757e658983aSAndreas Gruenbacher struct p_compressed_bm *p = pi->data; 4758b411b363SPhilipp Reisner 4759bde89a9eSAndreas Gruenbacher if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(connection)) { 4760d0180171SAndreas Gruenbacher drbd_err(device, "ReportCBitmap packet too large\n"); 476182bc0194SAndreas Gruenbacher err = -EIO; 4762b411b363SPhilipp Reisner goto out; 4763b411b363SPhilipp Reisner } 4764e658983aSAndreas Gruenbacher if (pi->size <= sizeof(*p)) { 4765d0180171SAndreas Gruenbacher drbd_err(device, "ReportCBitmap packet too small (l:%u)\n", pi->size); 476682bc0194SAndreas Gruenbacher err = -EIO; 476778fcbdaeSAndreas Gruenbacher goto out; 4768b411b363SPhilipp Reisner } 47699f4fe9adSAndreas Gruenbacher err = drbd_recv_all(peer_device->connection, p, pi->size); 4770e658983aSAndreas Gruenbacher if (err) 4771e658983aSAndreas Gruenbacher goto out; 477269a22773SAndreas Gruenbacher err = decode_bitmap_c(peer_device, p, &c, pi->size); 4773b411b363SPhilipp Reisner } else { 4774d0180171SAndreas Gruenbacher drbd_warn(device, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); 477582bc0194SAndreas Gruenbacher err = -EIO; 4776b411b363SPhilipp Reisner goto out; 4777b411b363SPhilipp Reisner } 4778b411b363SPhilipp Reisner 4779e2857216SAndreas Gruenbacher c.packets[pi->cmd == P_BITMAP]++; 4780bde89a9eSAndreas Gruenbacher c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(connection) + pi->size; 4781b411b363SPhilipp Reisner 47822c46407dSAndreas Gruenbacher if (err <= 0) { 47832c46407dSAndreas Gruenbacher if (err < 0) 47842c46407dSAndreas Gruenbacher goto out; 4785b411b363SPhilipp Reisner break; 47862c46407dSAndreas Gruenbacher } 47879f4fe9adSAndreas Gruenbacher err = drbd_recv_header(peer_device->connection, pi); 478882bc0194SAndreas Gruenbacher if (err) 4789b411b363SPhilipp Reisner goto out; 47902c46407dSAndreas Gruenbacher } 4791b411b363SPhilipp Reisner 4792b30ab791SAndreas Gruenbacher INFO_bm_xfer_stats(device, "receive", &c); 4793b411b363SPhilipp Reisner 4794b30ab791SAndreas Gruenbacher if (device->state.conn == C_WF_BITMAP_T) { 4795de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 4796de1f8e4aSAndreas Gruenbacher 4797b30ab791SAndreas Gruenbacher err = drbd_send_bitmap(device); 479882bc0194SAndreas Gruenbacher if (err) 4799b411b363SPhilipp Reisner goto out; 4800b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 4801b30ab791SAndreas Gruenbacher rv = _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 48020b0ba1efSAndreas Gruenbacher D_ASSERT(device, rv == SS_SUCCESS); 4803b30ab791SAndreas Gruenbacher } else if (device->state.conn != C_WF_BITMAP_S) { 4804b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 4805b411b363SPhilipp Reisner * other threads may have noticed network errors */ 4806d0180171SAndreas Gruenbacher drbd_info(device, "unexpected cstate (%s) in receive_bitmap\n", 4807b30ab791SAndreas Gruenbacher drbd_conn_str(device->state.conn)); 4808b411b363SPhilipp Reisner } 480982bc0194SAndreas Gruenbacher err = 0; 4810b411b363SPhilipp Reisner 4811b411b363SPhilipp Reisner out: 4812b30ab791SAndreas Gruenbacher drbd_bm_unlock(device); 4813b30ab791SAndreas Gruenbacher if (!err && device->state.conn == C_WF_BITMAP_S) 4814b30ab791SAndreas Gruenbacher drbd_start_resync(device, C_SYNC_SOURCE); 481582bc0194SAndreas Gruenbacher return err; 4816b411b363SPhilipp Reisner } 4817b411b363SPhilipp Reisner 4818bde89a9eSAndreas Gruenbacher static int receive_skip(struct drbd_connection *connection, struct packet_info *pi) 4819b411b363SPhilipp Reisner { 48201ec861ebSAndreas Gruenbacher drbd_warn(connection, "skipping unknown optional packet type %d, l: %d!\n", 4821e2857216SAndreas Gruenbacher pi->cmd, pi->size); 4822b411b363SPhilipp Reisner 4823bde89a9eSAndreas Gruenbacher return ignore_remaining_packet(connection, pi); 4824b411b363SPhilipp Reisner } 4825b411b363SPhilipp Reisner 4826bde89a9eSAndreas Gruenbacher static int receive_UnplugRemote(struct drbd_connection *connection, struct packet_info *pi) 4827b411b363SPhilipp Reisner { 4828b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 4829b411b363SPhilipp Reisner * with the data requests being unplugged */ 4830bde89a9eSAndreas Gruenbacher drbd_tcp_quickack(connection->data.socket); 4831b411b363SPhilipp Reisner 483282bc0194SAndreas Gruenbacher return 0; 4833b411b363SPhilipp Reisner } 4834b411b363SPhilipp Reisner 4835bde89a9eSAndreas Gruenbacher static int receive_out_of_sync(struct drbd_connection *connection, struct packet_info *pi) 483673a01a18SPhilipp Reisner { 48379f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 4838b30ab791SAndreas Gruenbacher struct drbd_device *device; 4839e658983aSAndreas Gruenbacher struct p_block_desc *p = pi->data; 48404a76b161SAndreas Gruenbacher 48419f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 48429f4fe9adSAndreas Gruenbacher if (!peer_device) 48434a76b161SAndreas Gruenbacher return -EIO; 48449f4fe9adSAndreas Gruenbacher device = peer_device->device; 484573a01a18SPhilipp Reisner 4846b30ab791SAndreas Gruenbacher switch (device->state.conn) { 4847f735e363SLars Ellenberg case C_WF_SYNC_UUID: 4848f735e363SLars Ellenberg case C_WF_BITMAP_T: 4849f735e363SLars Ellenberg case C_BEHIND: 4850f735e363SLars Ellenberg break; 4851f735e363SLars Ellenberg default: 4852d0180171SAndreas Gruenbacher drbd_err(device, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 4853b30ab791SAndreas Gruenbacher drbd_conn_str(device->state.conn)); 4854f735e363SLars Ellenberg } 4855f735e363SLars Ellenberg 4856b30ab791SAndreas Gruenbacher drbd_set_out_of_sync(device, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 485773a01a18SPhilipp Reisner 485882bc0194SAndreas Gruenbacher return 0; 485973a01a18SPhilipp Reisner } 486073a01a18SPhilipp Reisner 4861700ca8c0SPhilipp Reisner static int receive_rs_deallocated(struct drbd_connection *connection, struct packet_info *pi) 4862700ca8c0SPhilipp Reisner { 4863700ca8c0SPhilipp Reisner struct drbd_peer_device *peer_device; 4864700ca8c0SPhilipp Reisner struct p_block_desc *p = pi->data; 4865700ca8c0SPhilipp Reisner struct drbd_device *device; 4866700ca8c0SPhilipp Reisner sector_t sector; 4867700ca8c0SPhilipp Reisner int size, err = 0; 4868700ca8c0SPhilipp Reisner 4869700ca8c0SPhilipp Reisner peer_device = conn_peer_device(connection, pi->vnr); 4870700ca8c0SPhilipp Reisner if (!peer_device) 4871700ca8c0SPhilipp Reisner return -EIO; 4872700ca8c0SPhilipp Reisner device = peer_device->device; 4873700ca8c0SPhilipp Reisner 4874700ca8c0SPhilipp Reisner sector = be64_to_cpu(p->sector); 4875700ca8c0SPhilipp Reisner size = be32_to_cpu(p->blksize); 4876700ca8c0SPhilipp Reisner 4877700ca8c0SPhilipp Reisner dec_rs_pending(device); 4878700ca8c0SPhilipp Reisner 4879700ca8c0SPhilipp Reisner if (get_ldev(device)) { 4880700ca8c0SPhilipp Reisner struct drbd_peer_request *peer_req; 4881700ca8c0SPhilipp Reisner const int op = REQ_OP_DISCARD; 4882700ca8c0SPhilipp Reisner 4883700ca8c0SPhilipp Reisner peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER, sector, 48849104d31aSLars Ellenberg size, 0, GFP_NOIO); 4885700ca8c0SPhilipp Reisner if (!peer_req) { 4886700ca8c0SPhilipp Reisner put_ldev(device); 4887700ca8c0SPhilipp Reisner return -ENOMEM; 4888700ca8c0SPhilipp Reisner } 4889700ca8c0SPhilipp Reisner 4890700ca8c0SPhilipp Reisner peer_req->w.cb = e_end_resync_block; 4891700ca8c0SPhilipp Reisner peer_req->submit_jif = jiffies; 4892700ca8c0SPhilipp Reisner peer_req->flags |= EE_IS_TRIM; 4893700ca8c0SPhilipp Reisner 4894700ca8c0SPhilipp Reisner spin_lock_irq(&device->resource->req_lock); 4895700ca8c0SPhilipp Reisner list_add_tail(&peer_req->w.list, &device->sync_ee); 4896700ca8c0SPhilipp Reisner spin_unlock_irq(&device->resource->req_lock); 4897700ca8c0SPhilipp Reisner 4898700ca8c0SPhilipp Reisner atomic_add(pi->size >> 9, &device->rs_sect_ev); 4899700ca8c0SPhilipp Reisner err = drbd_submit_peer_request(device, peer_req, op, 0, DRBD_FAULT_RS_WR); 4900700ca8c0SPhilipp Reisner 4901700ca8c0SPhilipp Reisner if (err) { 4902700ca8c0SPhilipp Reisner spin_lock_irq(&device->resource->req_lock); 4903700ca8c0SPhilipp Reisner list_del(&peer_req->w.list); 4904700ca8c0SPhilipp Reisner spin_unlock_irq(&device->resource->req_lock); 4905700ca8c0SPhilipp Reisner 4906700ca8c0SPhilipp Reisner drbd_free_peer_req(device, peer_req); 4907700ca8c0SPhilipp Reisner put_ldev(device); 4908700ca8c0SPhilipp Reisner err = 0; 4909700ca8c0SPhilipp Reisner goto fail; 4910700ca8c0SPhilipp Reisner } 4911700ca8c0SPhilipp Reisner 4912700ca8c0SPhilipp Reisner inc_unacked(device); 4913700ca8c0SPhilipp Reisner 4914700ca8c0SPhilipp Reisner /* No put_ldev() here. Gets called in drbd_endio_write_sec_final(), 4915700ca8c0SPhilipp Reisner as well as drbd_rs_complete_io() */ 4916700ca8c0SPhilipp Reisner } else { 4917700ca8c0SPhilipp Reisner fail: 4918700ca8c0SPhilipp Reisner drbd_rs_complete_io(device, sector); 4919700ca8c0SPhilipp Reisner drbd_send_ack_ex(peer_device, P_NEG_ACK, sector, size, ID_SYNCER); 4920700ca8c0SPhilipp Reisner } 4921700ca8c0SPhilipp Reisner 4922700ca8c0SPhilipp Reisner atomic_add(size >> 9, &device->rs_sect_in); 4923700ca8c0SPhilipp Reisner 4924700ca8c0SPhilipp Reisner return err; 4925700ca8c0SPhilipp Reisner } 4926700ca8c0SPhilipp Reisner 492702918be2SPhilipp Reisner struct data_cmd { 492802918be2SPhilipp Reisner int expect_payload; 49299104d31aSLars Ellenberg unsigned int pkt_size; 4930bde89a9eSAndreas Gruenbacher int (*fn)(struct drbd_connection *, struct packet_info *); 4931b411b363SPhilipp Reisner }; 4932b411b363SPhilipp Reisner 493302918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 493402918be2SPhilipp Reisner [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 493502918be2SPhilipp Reisner [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 493602918be2SPhilipp Reisner [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 493702918be2SPhilipp Reisner [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 4938e658983aSAndreas Gruenbacher [P_BITMAP] = { 1, 0, receive_bitmap } , 4939e658983aSAndreas Gruenbacher [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , 4940e658983aSAndreas Gruenbacher [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, 494102918be2SPhilipp Reisner [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 494202918be2SPhilipp Reisner [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 4943e658983aSAndreas Gruenbacher [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, 4944e658983aSAndreas Gruenbacher [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, 494502918be2SPhilipp Reisner [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 494602918be2SPhilipp Reisner [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 494702918be2SPhilipp Reisner [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 494802918be2SPhilipp Reisner [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 494902918be2SPhilipp Reisner [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 495002918be2SPhilipp Reisner [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 495102918be2SPhilipp Reisner [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 495202918be2SPhilipp Reisner [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 495302918be2SPhilipp Reisner [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 4954700ca8c0SPhilipp Reisner [P_RS_THIN_REQ] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 495502918be2SPhilipp Reisner [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 495673a01a18SPhilipp Reisner [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 49574a76b161SAndreas Gruenbacher [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, 4958036b17eaSPhilipp Reisner [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, 4959a0fb3c47SLars Ellenberg [P_TRIM] = { 0, sizeof(struct p_trim), receive_Data }, 4960700ca8c0SPhilipp Reisner [P_RS_DEALLOCATED] = { 0, sizeof(struct p_block_desc), receive_rs_deallocated }, 49619104d31aSLars Ellenberg [P_WSAME] = { 1, sizeof(struct p_wsame), receive_Data }, 496202918be2SPhilipp Reisner }; 496302918be2SPhilipp Reisner 4964bde89a9eSAndreas Gruenbacher static void drbdd(struct drbd_connection *connection) 4965b411b363SPhilipp Reisner { 496677351055SPhilipp Reisner struct packet_info pi; 496702918be2SPhilipp Reisner size_t shs; /* sub header size */ 496882bc0194SAndreas Gruenbacher int err; 4969b411b363SPhilipp Reisner 4970bde89a9eSAndreas Gruenbacher while (get_t_state(&connection->receiver) == RUNNING) { 49719104d31aSLars Ellenberg struct data_cmd const *cmd; 4972deebe195SAndreas Gruenbacher 4973bde89a9eSAndreas Gruenbacher drbd_thread_current_set_cpu(&connection->receiver); 4974944410e9SLars Ellenberg update_receiver_timing_details(connection, drbd_recv_header); 4975bde89a9eSAndreas Gruenbacher if (drbd_recv_header(connection, &pi)) 497602918be2SPhilipp Reisner goto err_out; 497702918be2SPhilipp Reisner 4978deebe195SAndreas Gruenbacher cmd = &drbd_cmd_handler[pi.cmd]; 49794a76b161SAndreas Gruenbacher if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { 49801ec861ebSAndreas Gruenbacher drbd_err(connection, "Unexpected data packet %s (0x%04x)", 49812fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.cmd); 498202918be2SPhilipp Reisner goto err_out; 49830b33a916SLars Ellenberg } 4984b411b363SPhilipp Reisner 4985e658983aSAndreas Gruenbacher shs = cmd->pkt_size; 49869104d31aSLars Ellenberg if (pi.cmd == P_SIZES && connection->agreed_features & DRBD_FF_WSAME) 49879104d31aSLars Ellenberg shs += sizeof(struct o_qlim); 4988e658983aSAndreas Gruenbacher if (pi.size > shs && !cmd->expect_payload) { 49891ec861ebSAndreas Gruenbacher drbd_err(connection, "No payload expected %s l:%d\n", 49902fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.size); 4991c13f7e1aSLars Ellenberg goto err_out; 4992c13f7e1aSLars Ellenberg } 49939104d31aSLars Ellenberg if (pi.size < shs) { 49949104d31aSLars Ellenberg drbd_err(connection, "%s: unexpected packet size, expected:%d received:%d\n", 49959104d31aSLars Ellenberg cmdname(pi.cmd), (int)shs, pi.size); 49969104d31aSLars Ellenberg goto err_out; 49979104d31aSLars Ellenberg } 4998c13f7e1aSLars Ellenberg 4999c13f7e1aSLars Ellenberg if (shs) { 5000944410e9SLars Ellenberg update_receiver_timing_details(connection, drbd_recv_all_warn); 5001bde89a9eSAndreas Gruenbacher err = drbd_recv_all_warn(connection, pi.data, shs); 5002a5c31904SAndreas Gruenbacher if (err) 500302918be2SPhilipp Reisner goto err_out; 5004e2857216SAndreas Gruenbacher pi.size -= shs; 5005b411b363SPhilipp Reisner } 500602918be2SPhilipp Reisner 5007944410e9SLars Ellenberg update_receiver_timing_details(connection, cmd->fn); 5008bde89a9eSAndreas Gruenbacher err = cmd->fn(connection, &pi); 50094a76b161SAndreas Gruenbacher if (err) { 50101ec861ebSAndreas Gruenbacher drbd_err(connection, "error receiving %s, e: %d l: %d!\n", 50119f5bdc33SAndreas Gruenbacher cmdname(pi.cmd), err, pi.size); 501202918be2SPhilipp Reisner goto err_out; 501302918be2SPhilipp Reisner } 501402918be2SPhilipp Reisner } 501582bc0194SAndreas Gruenbacher return; 501602918be2SPhilipp Reisner 501702918be2SPhilipp Reisner err_out: 5018bde89a9eSAndreas Gruenbacher conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 5019b411b363SPhilipp Reisner } 5020b411b363SPhilipp Reisner 5021bde89a9eSAndreas Gruenbacher static void conn_disconnect(struct drbd_connection *connection) 5022f70b3511SPhilipp Reisner { 5023c06ece6bSAndreas Gruenbacher struct drbd_peer_device *peer_device; 5024bbeb641cSPhilipp Reisner enum drbd_conns oc; 5025376694a0SPhilipp Reisner int vnr; 5026f70b3511SPhilipp Reisner 5027bde89a9eSAndreas Gruenbacher if (connection->cstate == C_STANDALONE) 5028b411b363SPhilipp Reisner return; 5029b411b363SPhilipp Reisner 5030545752d5SLars Ellenberg /* We are about to start the cleanup after connection loss. 5031545752d5SLars Ellenberg * Make sure drbd_make_request knows about that. 5032545752d5SLars Ellenberg * Usually we should be in some network failure state already, 5033545752d5SLars Ellenberg * but just in case we are not, we fix it up here. 5034545752d5SLars Ellenberg */ 5035bde89a9eSAndreas Gruenbacher conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); 5036545752d5SLars Ellenberg 5037668700b4SPhilipp Reisner /* ack_receiver does not clean up anything. it must not interfere, either */ 50381c03e520SPhilipp Reisner drbd_thread_stop(&connection->ack_receiver); 5039668700b4SPhilipp Reisner if (connection->ack_sender) { 5040668700b4SPhilipp Reisner destroy_workqueue(connection->ack_sender); 5041668700b4SPhilipp Reisner connection->ack_sender = NULL; 5042668700b4SPhilipp Reisner } 5043bde89a9eSAndreas Gruenbacher drbd_free_sock(connection); 5044360cc740SPhilipp Reisner 5045c141ebdaSPhilipp Reisner rcu_read_lock(); 5046c06ece6bSAndreas Gruenbacher idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { 5047c06ece6bSAndreas Gruenbacher struct drbd_device *device = peer_device->device; 5048b30ab791SAndreas Gruenbacher kref_get(&device->kref); 5049c141ebdaSPhilipp Reisner rcu_read_unlock(); 505069a22773SAndreas Gruenbacher drbd_disconnected(peer_device); 5051c06ece6bSAndreas Gruenbacher kref_put(&device->kref, drbd_destroy_device); 5052c141ebdaSPhilipp Reisner rcu_read_lock(); 5053c141ebdaSPhilipp Reisner } 5054c141ebdaSPhilipp Reisner rcu_read_unlock(); 5055c141ebdaSPhilipp Reisner 5056bde89a9eSAndreas Gruenbacher if (!list_empty(&connection->current_epoch->list)) 50571ec861ebSAndreas Gruenbacher drbd_err(connection, "ASSERTION FAILED: connection->current_epoch->list not empty\n"); 505812038a3aSPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 5059bde89a9eSAndreas Gruenbacher atomic_set(&connection->current_epoch->epoch_size, 0); 5060bde89a9eSAndreas Gruenbacher connection->send.seen_any_write_yet = false; 506112038a3aSPhilipp Reisner 50621ec861ebSAndreas Gruenbacher drbd_info(connection, "Connection closed\n"); 5063360cc740SPhilipp Reisner 5064bde89a9eSAndreas Gruenbacher if (conn_highest_role(connection) == R_PRIMARY && conn_highest_pdsk(connection) >= D_UNKNOWN) 5065bde89a9eSAndreas Gruenbacher conn_try_outdate_peer_async(connection); 5066cb703454SPhilipp Reisner 50670500813fSAndreas Gruenbacher spin_lock_irq(&connection->resource->req_lock); 5068bde89a9eSAndreas Gruenbacher oc = connection->cstate; 5069bbeb641cSPhilipp Reisner if (oc >= C_UNCONNECTED) 5070bde89a9eSAndreas Gruenbacher _conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE); 5071bbeb641cSPhilipp Reisner 50720500813fSAndreas Gruenbacher spin_unlock_irq(&connection->resource->req_lock); 5073360cc740SPhilipp Reisner 5074f3dfa40aSLars Ellenberg if (oc == C_DISCONNECTING) 5075bde89a9eSAndreas Gruenbacher conn_request_state(connection, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); 5076360cc740SPhilipp Reisner } 5077360cc740SPhilipp Reisner 507869a22773SAndreas Gruenbacher static int drbd_disconnected(struct drbd_peer_device *peer_device) 5079360cc740SPhilipp Reisner { 508069a22773SAndreas Gruenbacher struct drbd_device *device = peer_device->device; 5081360cc740SPhilipp Reisner unsigned int i; 5082b411b363SPhilipp Reisner 508385719573SPhilipp Reisner /* wait for current activity to cease. */ 50840500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 5085b30ab791SAndreas Gruenbacher _drbd_wait_ee_list_empty(device, &device->active_ee); 5086b30ab791SAndreas Gruenbacher _drbd_wait_ee_list_empty(device, &device->sync_ee); 5087b30ab791SAndreas Gruenbacher _drbd_wait_ee_list_empty(device, &device->read_ee); 50880500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 5089b411b363SPhilipp Reisner 5090b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 5091b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 5092b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 5093b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 5094b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 5095b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 5096b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 5097b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 5098b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 5099b411b363SPhilipp Reisner * on the fly. */ 5100b30ab791SAndreas Gruenbacher drbd_rs_cancel_all(device); 5101b30ab791SAndreas Gruenbacher device->rs_total = 0; 5102b30ab791SAndreas Gruenbacher device->rs_failed = 0; 5103b30ab791SAndreas Gruenbacher atomic_set(&device->rs_pending_cnt, 0); 5104b30ab791SAndreas Gruenbacher wake_up(&device->misc_wait); 5105b411b363SPhilipp Reisner 5106b30ab791SAndreas Gruenbacher del_timer_sync(&device->resync_timer); 5107b30ab791SAndreas Gruenbacher resync_timer_fn((unsigned long)device); 5108b411b363SPhilipp Reisner 5109b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 5110b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 5111b411b363SPhilipp Reisner * to be "canceled" */ 5112b5043c5eSAndreas Gruenbacher drbd_flush_workqueue(&peer_device->connection->sender_work); 5113b411b363SPhilipp Reisner 5114b30ab791SAndreas Gruenbacher drbd_finish_peer_reqs(device); 5115b411b363SPhilipp Reisner 5116d10b4ea3SPhilipp Reisner /* This second workqueue flush is necessary, since drbd_finish_peer_reqs() 5117d10b4ea3SPhilipp Reisner might have issued a work again. The one before drbd_finish_peer_reqs() is 5118d10b4ea3SPhilipp Reisner necessary to reclain net_ee in drbd_finish_peer_reqs(). */ 5119b5043c5eSAndreas Gruenbacher drbd_flush_workqueue(&peer_device->connection->sender_work); 5120d10b4ea3SPhilipp Reisner 512108332d73SLars Ellenberg /* need to do it again, drbd_finish_peer_reqs() may have populated it 512208332d73SLars Ellenberg * again via drbd_try_clear_on_disk_bm(). */ 5123b30ab791SAndreas Gruenbacher drbd_rs_cancel_all(device); 5124b411b363SPhilipp Reisner 5125b30ab791SAndreas Gruenbacher kfree(device->p_uuid); 5126b30ab791SAndreas Gruenbacher device->p_uuid = NULL; 5127b411b363SPhilipp Reisner 5128b30ab791SAndreas Gruenbacher if (!drbd_suspended(device)) 512969a22773SAndreas Gruenbacher tl_clear(peer_device->connection); 5130b411b363SPhilipp Reisner 5131b30ab791SAndreas Gruenbacher drbd_md_sync(device); 5132b411b363SPhilipp Reisner 5133be115b69SLars Ellenberg if (get_ldev(device)) { 5134be115b69SLars Ellenberg drbd_bitmap_io(device, &drbd_bm_write_copy_pages, 5135be115b69SLars Ellenberg "write from disconnected", BM_LOCKED_CHANGE_ALLOWED); 5136be115b69SLars Ellenberg put_ldev(device); 5137be115b69SLars Ellenberg } 513820ceb2b2SLars Ellenberg 5139b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 5140b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 5141b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 5142b411b363SPhilipp Reisner * 5143b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 5144b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 5145b411b363SPhilipp Reisner */ 5146b30ab791SAndreas Gruenbacher i = drbd_free_peer_reqs(device, &device->net_ee); 5147b411b363SPhilipp Reisner if (i) 5148d0180171SAndreas Gruenbacher drbd_info(device, "net_ee not empty, killed %u entries\n", i); 5149b30ab791SAndreas Gruenbacher i = atomic_read(&device->pp_in_use_by_net); 5150435f0740SLars Ellenberg if (i) 5151d0180171SAndreas Gruenbacher drbd_info(device, "pp_in_use_by_net = %d, expected 0\n", i); 5152b30ab791SAndreas Gruenbacher i = atomic_read(&device->pp_in_use); 5153b411b363SPhilipp Reisner if (i) 5154d0180171SAndreas Gruenbacher drbd_info(device, "pp_in_use = %d, expected 0\n", i); 5155b411b363SPhilipp Reisner 51560b0ba1efSAndreas Gruenbacher D_ASSERT(device, list_empty(&device->read_ee)); 51570b0ba1efSAndreas Gruenbacher D_ASSERT(device, list_empty(&device->active_ee)); 51580b0ba1efSAndreas Gruenbacher D_ASSERT(device, list_empty(&device->sync_ee)); 51590b0ba1efSAndreas Gruenbacher D_ASSERT(device, list_empty(&device->done_ee)); 5160b411b363SPhilipp Reisner 5161360cc740SPhilipp Reisner return 0; 5162b411b363SPhilipp Reisner } 5163b411b363SPhilipp Reisner 5164b411b363SPhilipp Reisner /* 5165b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 5166b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 5167b411b363SPhilipp Reisner * 5168b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 5169b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 5170b411b363SPhilipp Reisner * 5171b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 5172b411b363SPhilipp Reisner */ 5173bde89a9eSAndreas Gruenbacher static int drbd_send_features(struct drbd_connection *connection) 5174b411b363SPhilipp Reisner { 51759f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 51769f5bdc33SAndreas Gruenbacher struct p_connection_features *p; 5177b411b363SPhilipp Reisner 5178bde89a9eSAndreas Gruenbacher sock = &connection->data; 5179bde89a9eSAndreas Gruenbacher p = conn_prepare_command(connection, sock); 51809f5bdc33SAndreas Gruenbacher if (!p) 5181e8d17b01SAndreas Gruenbacher return -EIO; 5182b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 5183b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 5184b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 518520c68fdeSLars Ellenberg p->feature_flags = cpu_to_be32(PRO_FEATURES); 5186bde89a9eSAndreas Gruenbacher return conn_send_command(connection, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); 5187b411b363SPhilipp Reisner } 5188b411b363SPhilipp Reisner 5189b411b363SPhilipp Reisner /* 5190b411b363SPhilipp Reisner * return values: 5191b411b363SPhilipp Reisner * 1 yes, we have a valid connection 5192b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 5193b411b363SPhilipp Reisner * -1 peer talks different language, 5194b411b363SPhilipp Reisner * no point in trying again, please go standalone. 5195b411b363SPhilipp Reisner */ 5196bde89a9eSAndreas Gruenbacher static int drbd_do_features(struct drbd_connection *connection) 5197b411b363SPhilipp Reisner { 5198bde89a9eSAndreas Gruenbacher /* ASSERT current == connection->receiver ... */ 5199e658983aSAndreas Gruenbacher struct p_connection_features *p; 5200e658983aSAndreas Gruenbacher const int expect = sizeof(struct p_connection_features); 520177351055SPhilipp Reisner struct packet_info pi; 5202a5c31904SAndreas Gruenbacher int err; 5203b411b363SPhilipp Reisner 5204bde89a9eSAndreas Gruenbacher err = drbd_send_features(connection); 5205e8d17b01SAndreas Gruenbacher if (err) 5206b411b363SPhilipp Reisner return 0; 5207b411b363SPhilipp Reisner 5208bde89a9eSAndreas Gruenbacher err = drbd_recv_header(connection, &pi); 520969bc7bc3SAndreas Gruenbacher if (err) 5210b411b363SPhilipp Reisner return 0; 5211b411b363SPhilipp Reisner 52126038178eSAndreas Gruenbacher if (pi.cmd != P_CONNECTION_FEATURES) { 52131ec861ebSAndreas Gruenbacher drbd_err(connection, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", 521477351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 5215b411b363SPhilipp Reisner return -1; 5216b411b363SPhilipp Reisner } 5217b411b363SPhilipp Reisner 521877351055SPhilipp Reisner if (pi.size != expect) { 52191ec861ebSAndreas Gruenbacher drbd_err(connection, "expected ConnectionFeatures length: %u, received: %u\n", 522077351055SPhilipp Reisner expect, pi.size); 5221b411b363SPhilipp Reisner return -1; 5222b411b363SPhilipp Reisner } 5223b411b363SPhilipp Reisner 5224e658983aSAndreas Gruenbacher p = pi.data; 5225bde89a9eSAndreas Gruenbacher err = drbd_recv_all_warn(connection, p, expect); 5226a5c31904SAndreas Gruenbacher if (err) 5227b411b363SPhilipp Reisner return 0; 5228b411b363SPhilipp Reisner 5229b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 5230b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 5231b411b363SPhilipp Reisner if (p->protocol_max == 0) 5232b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 5233b411b363SPhilipp Reisner 5234b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 5235b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 5236b411b363SPhilipp Reisner goto incompat; 5237b411b363SPhilipp Reisner 5238bde89a9eSAndreas Gruenbacher connection->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 523920c68fdeSLars Ellenberg connection->agreed_features = PRO_FEATURES & be32_to_cpu(p->feature_flags); 5240b411b363SPhilipp Reisner 52411ec861ebSAndreas Gruenbacher drbd_info(connection, "Handshake successful: " 5242bde89a9eSAndreas Gruenbacher "Agreed network protocol version %d\n", connection->agreed_pro_version); 5243b411b363SPhilipp Reisner 52449104d31aSLars Ellenberg drbd_info(connection, "Feature flags enabled on protocol level: 0x%x%s%s%s.\n", 52459104d31aSLars Ellenberg connection->agreed_features, 52469104d31aSLars Ellenberg connection->agreed_features & DRBD_FF_TRIM ? " TRIM" : "", 52479104d31aSLars Ellenberg connection->agreed_features & DRBD_FF_THIN_RESYNC ? " THIN_RESYNC" : "", 52489104d31aSLars Ellenberg connection->agreed_features & DRBD_FF_WSAME ? " WRITE_SAME" : 52499104d31aSLars Ellenberg connection->agreed_features ? "" : " none"); 525092d94ae6SPhilipp Reisner 5251b411b363SPhilipp Reisner return 1; 5252b411b363SPhilipp Reisner 5253b411b363SPhilipp Reisner incompat: 52541ec861ebSAndreas Gruenbacher drbd_err(connection, "incompatible DRBD dialects: " 5255b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 5256b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 5257b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 5258b411b363SPhilipp Reisner return -1; 5259b411b363SPhilipp Reisner } 5260b411b363SPhilipp Reisner 5261b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 5262bde89a9eSAndreas Gruenbacher static int drbd_do_auth(struct drbd_connection *connection) 5263b411b363SPhilipp Reisner { 52641ec861ebSAndreas Gruenbacher drbd_err(connection, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 52651ec861ebSAndreas Gruenbacher drbd_err(connection, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 5266b10d96cbSJohannes Thoma return -1; 5267b411b363SPhilipp Reisner } 5268b411b363SPhilipp Reisner #else 5269b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 5270b10d96cbSJohannes Thoma 5271b10d96cbSJohannes Thoma /* Return value: 5272b10d96cbSJohannes Thoma 1 - auth succeeded, 5273b10d96cbSJohannes Thoma 0 - failed, try again (network error), 5274b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 5275b10d96cbSJohannes Thoma */ 5276b10d96cbSJohannes Thoma 5277bde89a9eSAndreas Gruenbacher static int drbd_do_auth(struct drbd_connection *connection) 5278b411b363SPhilipp Reisner { 52799f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 5280b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 5281b411b363SPhilipp Reisner char *response = NULL; 5282b411b363SPhilipp Reisner char *right_response = NULL; 5283b411b363SPhilipp Reisner char *peers_ch = NULL; 528444ed167dSPhilipp Reisner unsigned int key_len; 528544ed167dSPhilipp Reisner char secret[SHARED_SECRET_MAX]; /* 64 byte */ 5286b411b363SPhilipp Reisner unsigned int resp_size; 52879534d671SHerbert Xu SHASH_DESC_ON_STACK(desc, connection->cram_hmac_tfm); 528877351055SPhilipp Reisner struct packet_info pi; 528944ed167dSPhilipp Reisner struct net_conf *nc; 529069bc7bc3SAndreas Gruenbacher int err, rv; 5291b411b363SPhilipp Reisner 52929f5bdc33SAndreas Gruenbacher /* FIXME: Put the challenge/response into the preallocated socket buffer. */ 52939f5bdc33SAndreas Gruenbacher 529444ed167dSPhilipp Reisner rcu_read_lock(); 5295bde89a9eSAndreas Gruenbacher nc = rcu_dereference(connection->net_conf); 529644ed167dSPhilipp Reisner key_len = strlen(nc->shared_secret); 529744ed167dSPhilipp Reisner memcpy(secret, nc->shared_secret, key_len); 529844ed167dSPhilipp Reisner rcu_read_unlock(); 529944ed167dSPhilipp Reisner 53009534d671SHerbert Xu desc->tfm = connection->cram_hmac_tfm; 53019534d671SHerbert Xu desc->flags = 0; 5302b411b363SPhilipp Reisner 53039534d671SHerbert Xu rv = crypto_shash_setkey(connection->cram_hmac_tfm, (u8 *)secret, key_len); 5304b411b363SPhilipp Reisner if (rv) { 53059534d671SHerbert Xu drbd_err(connection, "crypto_shash_setkey() failed with %d\n", rv); 5306b10d96cbSJohannes Thoma rv = -1; 5307b411b363SPhilipp Reisner goto fail; 5308b411b363SPhilipp Reisner } 5309b411b363SPhilipp Reisner 5310b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 5311b411b363SPhilipp Reisner 5312bde89a9eSAndreas Gruenbacher sock = &connection->data; 5313bde89a9eSAndreas Gruenbacher if (!conn_prepare_command(connection, sock)) { 53149f5bdc33SAndreas Gruenbacher rv = 0; 53159f5bdc33SAndreas Gruenbacher goto fail; 53169f5bdc33SAndreas Gruenbacher } 5317bde89a9eSAndreas Gruenbacher rv = !conn_send_command(connection, sock, P_AUTH_CHALLENGE, 0, 53189f5bdc33SAndreas Gruenbacher my_challenge, CHALLENGE_LEN); 5319b411b363SPhilipp Reisner if (!rv) 5320b411b363SPhilipp Reisner goto fail; 5321b411b363SPhilipp Reisner 5322bde89a9eSAndreas Gruenbacher err = drbd_recv_header(connection, &pi); 532369bc7bc3SAndreas Gruenbacher if (err) { 5324b411b363SPhilipp Reisner rv = 0; 5325b411b363SPhilipp Reisner goto fail; 5326b411b363SPhilipp Reisner } 5327b411b363SPhilipp Reisner 532877351055SPhilipp Reisner if (pi.cmd != P_AUTH_CHALLENGE) { 53291ec861ebSAndreas Gruenbacher drbd_err(connection, "expected AuthChallenge packet, received: %s (0x%04x)\n", 533077351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 5331b411b363SPhilipp Reisner rv = 0; 5332b411b363SPhilipp Reisner goto fail; 5333b411b363SPhilipp Reisner } 5334b411b363SPhilipp Reisner 533577351055SPhilipp Reisner if (pi.size > CHALLENGE_LEN * 2) { 53361ec861ebSAndreas Gruenbacher drbd_err(connection, "expected AuthChallenge payload too big.\n"); 5337b10d96cbSJohannes Thoma rv = -1; 5338b411b363SPhilipp Reisner goto fail; 5339b411b363SPhilipp Reisner } 5340b411b363SPhilipp Reisner 534167cca286SPhilipp Reisner if (pi.size < CHALLENGE_LEN) { 534267cca286SPhilipp Reisner drbd_err(connection, "AuthChallenge payload too small.\n"); 534367cca286SPhilipp Reisner rv = -1; 534467cca286SPhilipp Reisner goto fail; 534567cca286SPhilipp Reisner } 534667cca286SPhilipp Reisner 534777351055SPhilipp Reisner peers_ch = kmalloc(pi.size, GFP_NOIO); 5348b411b363SPhilipp Reisner if (peers_ch == NULL) { 53491ec861ebSAndreas Gruenbacher drbd_err(connection, "kmalloc of peers_ch failed\n"); 5350b10d96cbSJohannes Thoma rv = -1; 5351b411b363SPhilipp Reisner goto fail; 5352b411b363SPhilipp Reisner } 5353b411b363SPhilipp Reisner 5354bde89a9eSAndreas Gruenbacher err = drbd_recv_all_warn(connection, peers_ch, pi.size); 5355a5c31904SAndreas Gruenbacher if (err) { 5356b411b363SPhilipp Reisner rv = 0; 5357b411b363SPhilipp Reisner goto fail; 5358b411b363SPhilipp Reisner } 5359b411b363SPhilipp Reisner 536067cca286SPhilipp Reisner if (!memcmp(my_challenge, peers_ch, CHALLENGE_LEN)) { 536167cca286SPhilipp Reisner drbd_err(connection, "Peer presented the same challenge!\n"); 536267cca286SPhilipp Reisner rv = -1; 536367cca286SPhilipp Reisner goto fail; 536467cca286SPhilipp Reisner } 536567cca286SPhilipp Reisner 53669534d671SHerbert Xu resp_size = crypto_shash_digestsize(connection->cram_hmac_tfm); 5367b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 5368b411b363SPhilipp Reisner if (response == NULL) { 53691ec861ebSAndreas Gruenbacher drbd_err(connection, "kmalloc of response failed\n"); 5370b10d96cbSJohannes Thoma rv = -1; 5371b411b363SPhilipp Reisner goto fail; 5372b411b363SPhilipp Reisner } 5373b411b363SPhilipp Reisner 53749534d671SHerbert Xu rv = crypto_shash_digest(desc, peers_ch, pi.size, response); 5375b411b363SPhilipp Reisner if (rv) { 53761ec861ebSAndreas Gruenbacher drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); 5377b10d96cbSJohannes Thoma rv = -1; 5378b411b363SPhilipp Reisner goto fail; 5379b411b363SPhilipp Reisner } 5380b411b363SPhilipp Reisner 5381bde89a9eSAndreas Gruenbacher if (!conn_prepare_command(connection, sock)) { 53829f5bdc33SAndreas Gruenbacher rv = 0; 53839f5bdc33SAndreas Gruenbacher goto fail; 53849f5bdc33SAndreas Gruenbacher } 5385bde89a9eSAndreas Gruenbacher rv = !conn_send_command(connection, sock, P_AUTH_RESPONSE, 0, 53869f5bdc33SAndreas Gruenbacher response, resp_size); 5387b411b363SPhilipp Reisner if (!rv) 5388b411b363SPhilipp Reisner goto fail; 5389b411b363SPhilipp Reisner 5390bde89a9eSAndreas Gruenbacher err = drbd_recv_header(connection, &pi); 539169bc7bc3SAndreas Gruenbacher if (err) { 5392b411b363SPhilipp Reisner rv = 0; 5393b411b363SPhilipp Reisner goto fail; 5394b411b363SPhilipp Reisner } 5395b411b363SPhilipp Reisner 539677351055SPhilipp Reisner if (pi.cmd != P_AUTH_RESPONSE) { 53971ec861ebSAndreas Gruenbacher drbd_err(connection, "expected AuthResponse packet, received: %s (0x%04x)\n", 539877351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 5399b411b363SPhilipp Reisner rv = 0; 5400b411b363SPhilipp Reisner goto fail; 5401b411b363SPhilipp Reisner } 5402b411b363SPhilipp Reisner 540377351055SPhilipp Reisner if (pi.size != resp_size) { 54041ec861ebSAndreas Gruenbacher drbd_err(connection, "expected AuthResponse payload of wrong size\n"); 5405b411b363SPhilipp Reisner rv = 0; 5406b411b363SPhilipp Reisner goto fail; 5407b411b363SPhilipp Reisner } 5408b411b363SPhilipp Reisner 5409bde89a9eSAndreas Gruenbacher err = drbd_recv_all_warn(connection, response , resp_size); 5410a5c31904SAndreas Gruenbacher if (err) { 5411b411b363SPhilipp Reisner rv = 0; 5412b411b363SPhilipp Reisner goto fail; 5413b411b363SPhilipp Reisner } 5414b411b363SPhilipp Reisner 5415b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 54162d1ee87dSJulia Lawall if (right_response == NULL) { 54171ec861ebSAndreas Gruenbacher drbd_err(connection, "kmalloc of right_response failed\n"); 5418b10d96cbSJohannes Thoma rv = -1; 5419b411b363SPhilipp Reisner goto fail; 5420b411b363SPhilipp Reisner } 5421b411b363SPhilipp Reisner 54229534d671SHerbert Xu rv = crypto_shash_digest(desc, my_challenge, CHALLENGE_LEN, 54239534d671SHerbert Xu right_response); 5424b411b363SPhilipp Reisner if (rv) { 54251ec861ebSAndreas Gruenbacher drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); 5426b10d96cbSJohannes Thoma rv = -1; 5427b411b363SPhilipp Reisner goto fail; 5428b411b363SPhilipp Reisner } 5429b411b363SPhilipp Reisner 5430b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 5431b411b363SPhilipp Reisner 5432b411b363SPhilipp Reisner if (rv) 54331ec861ebSAndreas Gruenbacher drbd_info(connection, "Peer authenticated using %d bytes HMAC\n", 543444ed167dSPhilipp Reisner resp_size); 5435b10d96cbSJohannes Thoma else 5436b10d96cbSJohannes Thoma rv = -1; 5437b411b363SPhilipp Reisner 5438b411b363SPhilipp Reisner fail: 5439b411b363SPhilipp Reisner kfree(peers_ch); 5440b411b363SPhilipp Reisner kfree(response); 5441b411b363SPhilipp Reisner kfree(right_response); 54429534d671SHerbert Xu shash_desc_zero(desc); 5443b411b363SPhilipp Reisner 5444b411b363SPhilipp Reisner return rv; 5445b411b363SPhilipp Reisner } 5446b411b363SPhilipp Reisner #endif 5447b411b363SPhilipp Reisner 54488fe60551SAndreas Gruenbacher int drbd_receiver(struct drbd_thread *thi) 5449b411b363SPhilipp Reisner { 5450bde89a9eSAndreas Gruenbacher struct drbd_connection *connection = thi->connection; 5451b411b363SPhilipp Reisner int h; 5452b411b363SPhilipp Reisner 54531ec861ebSAndreas Gruenbacher drbd_info(connection, "receiver (re)started\n"); 5454b411b363SPhilipp Reisner 5455b411b363SPhilipp Reisner do { 5456bde89a9eSAndreas Gruenbacher h = conn_connect(connection); 5457b411b363SPhilipp Reisner if (h == 0) { 5458bde89a9eSAndreas Gruenbacher conn_disconnect(connection); 545920ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 5460b411b363SPhilipp Reisner } 5461b411b363SPhilipp Reisner if (h == -1) { 54621ec861ebSAndreas Gruenbacher drbd_warn(connection, "Discarding network configuration.\n"); 5463bde89a9eSAndreas Gruenbacher conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); 5464b411b363SPhilipp Reisner } 5465b411b363SPhilipp Reisner } while (h == 0); 5466b411b363SPhilipp Reisner 546791fd4dadSPhilipp Reisner if (h > 0) 5468bde89a9eSAndreas Gruenbacher drbdd(connection); 5469b411b363SPhilipp Reisner 5470bde89a9eSAndreas Gruenbacher conn_disconnect(connection); 5471b411b363SPhilipp Reisner 54721ec861ebSAndreas Gruenbacher drbd_info(connection, "receiver terminated\n"); 5473b411b363SPhilipp Reisner return 0; 5474b411b363SPhilipp Reisner } 5475b411b363SPhilipp Reisner 5476b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 5477b411b363SPhilipp Reisner 5478bde89a9eSAndreas Gruenbacher static int got_conn_RqSReply(struct drbd_connection *connection, struct packet_info *pi) 5479b411b363SPhilipp Reisner { 5480e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 5481b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 5482b411b363SPhilipp Reisner 5483b411b363SPhilipp Reisner if (retcode >= SS_SUCCESS) { 5484bde89a9eSAndreas Gruenbacher set_bit(CONN_WD_ST_CHG_OKAY, &connection->flags); 5485b411b363SPhilipp Reisner } else { 5486bde89a9eSAndreas Gruenbacher set_bit(CONN_WD_ST_CHG_FAIL, &connection->flags); 54871ec861ebSAndreas Gruenbacher drbd_err(connection, "Requested state change failed by peer: %s (%d)\n", 5488fc3b10a4SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 5489fc3b10a4SPhilipp Reisner } 5490bde89a9eSAndreas Gruenbacher wake_up(&connection->ping_wait); 5491e4f78edeSPhilipp Reisner 54922735a594SAndreas Gruenbacher return 0; 5493fc3b10a4SPhilipp Reisner } 5494e4f78edeSPhilipp Reisner 5495bde89a9eSAndreas Gruenbacher static int got_RqSReply(struct drbd_connection *connection, struct packet_info *pi) 5496e4f78edeSPhilipp Reisner { 54979f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 5498b30ab791SAndreas Gruenbacher struct drbd_device *device; 5499e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 5500e4f78edeSPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 5501e4f78edeSPhilipp Reisner 55029f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 55039f4fe9adSAndreas Gruenbacher if (!peer_device) 55042735a594SAndreas Gruenbacher return -EIO; 55059f4fe9adSAndreas Gruenbacher device = peer_device->device; 55061952e916SAndreas Gruenbacher 5507bde89a9eSAndreas Gruenbacher if (test_bit(CONN_WD_ST_CHG_REQ, &connection->flags)) { 55080b0ba1efSAndreas Gruenbacher D_ASSERT(device, connection->agreed_pro_version < 100); 5509bde89a9eSAndreas Gruenbacher return got_conn_RqSReply(connection, pi); 55104d0fc3fdSPhilipp Reisner } 55114d0fc3fdSPhilipp Reisner 5512e4f78edeSPhilipp Reisner if (retcode >= SS_SUCCESS) { 5513b30ab791SAndreas Gruenbacher set_bit(CL_ST_CHG_SUCCESS, &device->flags); 5514e4f78edeSPhilipp Reisner } else { 5515b30ab791SAndreas Gruenbacher set_bit(CL_ST_CHG_FAIL, &device->flags); 5516d0180171SAndreas Gruenbacher drbd_err(device, "Requested state change failed by peer: %s (%d)\n", 5517b411b363SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 5518b411b363SPhilipp Reisner } 5519b30ab791SAndreas Gruenbacher wake_up(&device->state_wait); 5520b411b363SPhilipp Reisner 55212735a594SAndreas Gruenbacher return 0; 5522b411b363SPhilipp Reisner } 5523b411b363SPhilipp Reisner 5524bde89a9eSAndreas Gruenbacher static int got_Ping(struct drbd_connection *connection, struct packet_info *pi) 5525b411b363SPhilipp Reisner { 5526bde89a9eSAndreas Gruenbacher return drbd_send_ping_ack(connection); 5527b411b363SPhilipp Reisner 5528b411b363SPhilipp Reisner } 5529b411b363SPhilipp Reisner 5530bde89a9eSAndreas Gruenbacher static int got_PingAck(struct drbd_connection *connection, struct packet_info *pi) 5531b411b363SPhilipp Reisner { 5532b411b363SPhilipp Reisner /* restore idle timeout */ 5533bde89a9eSAndreas Gruenbacher connection->meta.socket->sk->sk_rcvtimeo = connection->net_conf->ping_int*HZ; 5534bde89a9eSAndreas Gruenbacher if (!test_and_set_bit(GOT_PING_ACK, &connection->flags)) 5535bde89a9eSAndreas Gruenbacher wake_up(&connection->ping_wait); 5536b411b363SPhilipp Reisner 55372735a594SAndreas Gruenbacher return 0; 5538b411b363SPhilipp Reisner } 5539b411b363SPhilipp Reisner 5540bde89a9eSAndreas Gruenbacher static int got_IsInSync(struct drbd_connection *connection, struct packet_info *pi) 5541b411b363SPhilipp Reisner { 55429f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 5543b30ab791SAndreas Gruenbacher struct drbd_device *device; 5544e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 5545b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 5546b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 5547b411b363SPhilipp Reisner 55489f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 55499f4fe9adSAndreas Gruenbacher if (!peer_device) 55502735a594SAndreas Gruenbacher return -EIO; 55519f4fe9adSAndreas Gruenbacher device = peer_device->device; 55521952e916SAndreas Gruenbacher 55539f4fe9adSAndreas Gruenbacher D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); 5554b411b363SPhilipp Reisner 555569a22773SAndreas Gruenbacher update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); 5556b411b363SPhilipp Reisner 5557b30ab791SAndreas Gruenbacher if (get_ldev(device)) { 5558b30ab791SAndreas Gruenbacher drbd_rs_complete_io(device, sector); 5559b30ab791SAndreas Gruenbacher drbd_set_in_sync(device, sector, blksize); 5560b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 5561b30ab791SAndreas Gruenbacher device->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 5562b30ab791SAndreas Gruenbacher put_ldev(device); 55631d53f09eSLars Ellenberg } 5564b30ab791SAndreas Gruenbacher dec_rs_pending(device); 5565b30ab791SAndreas Gruenbacher atomic_add(blksize >> 9, &device->rs_sect_in); 5566b411b363SPhilipp Reisner 55672735a594SAndreas Gruenbacher return 0; 5568b411b363SPhilipp Reisner } 5569b411b363SPhilipp Reisner 5570bc9c5c41SAndreas Gruenbacher static int 5571b30ab791SAndreas Gruenbacher validate_req_change_req_state(struct drbd_device *device, u64 id, sector_t sector, 5572bc9c5c41SAndreas Gruenbacher struct rb_root *root, const char *func, 5573bc9c5c41SAndreas Gruenbacher enum drbd_req_event what, bool missing_ok) 5574b411b363SPhilipp Reisner { 5575b411b363SPhilipp Reisner struct drbd_request *req; 5576b411b363SPhilipp Reisner struct bio_and_error m; 5577b411b363SPhilipp Reisner 55780500813fSAndreas Gruenbacher spin_lock_irq(&device->resource->req_lock); 5579b30ab791SAndreas Gruenbacher req = find_request(device, root, id, sector, missing_ok, func); 5580b411b363SPhilipp Reisner if (unlikely(!req)) { 55810500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 558285997675SAndreas Gruenbacher return -EIO; 5583b411b363SPhilipp Reisner } 5584b411b363SPhilipp Reisner __req_mod(req, what, &m); 55850500813fSAndreas Gruenbacher spin_unlock_irq(&device->resource->req_lock); 5586b411b363SPhilipp Reisner 5587b411b363SPhilipp Reisner if (m.bio) 5588b30ab791SAndreas Gruenbacher complete_master_bio(device, &m); 558985997675SAndreas Gruenbacher return 0; 5590b411b363SPhilipp Reisner } 5591b411b363SPhilipp Reisner 5592bde89a9eSAndreas Gruenbacher static int got_BlockAck(struct drbd_connection *connection, struct packet_info *pi) 5593b411b363SPhilipp Reisner { 55949f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 5595b30ab791SAndreas Gruenbacher struct drbd_device *device; 5596e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 5597b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 5598b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 5599b411b363SPhilipp Reisner enum drbd_req_event what; 5600b411b363SPhilipp Reisner 56019f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 56029f4fe9adSAndreas Gruenbacher if (!peer_device) 56032735a594SAndreas Gruenbacher return -EIO; 56049f4fe9adSAndreas Gruenbacher device = peer_device->device; 56051952e916SAndreas Gruenbacher 560669a22773SAndreas Gruenbacher update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); 5607b411b363SPhilipp Reisner 5608579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 5609b30ab791SAndreas Gruenbacher drbd_set_in_sync(device, sector, blksize); 5610b30ab791SAndreas Gruenbacher dec_rs_pending(device); 56112735a594SAndreas Gruenbacher return 0; 5612b411b363SPhilipp Reisner } 5613e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 5614b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 56158554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER_AND_SIS; 5616b411b363SPhilipp Reisner break; 5617b411b363SPhilipp Reisner case P_WRITE_ACK: 56188554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER; 5619b411b363SPhilipp Reisner break; 5620b411b363SPhilipp Reisner case P_RECV_ACK: 56218554df1cSAndreas Gruenbacher what = RECV_ACKED_BY_PEER; 5622b411b363SPhilipp Reisner break; 5623d4dabbe2SLars Ellenberg case P_SUPERSEDED: 5624d4dabbe2SLars Ellenberg what = CONFLICT_RESOLVED; 56257be8da07SAndreas Gruenbacher break; 56267be8da07SAndreas Gruenbacher case P_RETRY_WRITE: 56277be8da07SAndreas Gruenbacher what = POSTPONE_WRITE; 5628b411b363SPhilipp Reisner break; 5629b411b363SPhilipp Reisner default: 56302735a594SAndreas Gruenbacher BUG(); 5631b411b363SPhilipp Reisner } 5632b411b363SPhilipp Reisner 5633b30ab791SAndreas Gruenbacher return validate_req_change_req_state(device, p->block_id, sector, 5634b30ab791SAndreas Gruenbacher &device->write_requests, __func__, 5635bc9c5c41SAndreas Gruenbacher what, false); 5636b411b363SPhilipp Reisner } 5637b411b363SPhilipp Reisner 5638bde89a9eSAndreas Gruenbacher static int got_NegAck(struct drbd_connection *connection, struct packet_info *pi) 5639b411b363SPhilipp Reisner { 56409f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 5641b30ab791SAndreas Gruenbacher struct drbd_device *device; 5642e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 5643b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 56442deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 564585997675SAndreas Gruenbacher int err; 5646b411b363SPhilipp Reisner 56479f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 56489f4fe9adSAndreas Gruenbacher if (!peer_device) 56492735a594SAndreas Gruenbacher return -EIO; 56509f4fe9adSAndreas Gruenbacher device = peer_device->device; 5651b411b363SPhilipp Reisner 565269a22773SAndreas Gruenbacher update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); 5653b411b363SPhilipp Reisner 5654579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 5655b30ab791SAndreas Gruenbacher dec_rs_pending(device); 5656b30ab791SAndreas Gruenbacher drbd_rs_failed_io(device, sector, size); 56572735a594SAndreas Gruenbacher return 0; 5658b411b363SPhilipp Reisner } 56592deb8336SPhilipp Reisner 5660b30ab791SAndreas Gruenbacher err = validate_req_change_req_state(device, p->block_id, sector, 5661b30ab791SAndreas Gruenbacher &device->write_requests, __func__, 5662303d1448SPhilipp Reisner NEG_ACKED, true); 566385997675SAndreas Gruenbacher if (err) { 56642deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 56652deb8336SPhilipp Reisner The master bio might already be completed, therefore the 5666c3afd8f5SAndreas Gruenbacher request is no longer in the collision hash. */ 56672deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 56682deb8336SPhilipp Reisner but then get a P_NEG_ACK afterwards. */ 5669b30ab791SAndreas Gruenbacher drbd_set_out_of_sync(device, sector, size); 56702deb8336SPhilipp Reisner } 56712735a594SAndreas Gruenbacher return 0; 5672b411b363SPhilipp Reisner } 5673b411b363SPhilipp Reisner 5674bde89a9eSAndreas Gruenbacher static int got_NegDReply(struct drbd_connection *connection, struct packet_info *pi) 5675b411b363SPhilipp Reisner { 56769f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 5677b30ab791SAndreas Gruenbacher struct drbd_device *device; 5678e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 5679b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 5680b411b363SPhilipp Reisner 56819f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 56829f4fe9adSAndreas Gruenbacher if (!peer_device) 56832735a594SAndreas Gruenbacher return -EIO; 56849f4fe9adSAndreas Gruenbacher device = peer_device->device; 56851952e916SAndreas Gruenbacher 568669a22773SAndreas Gruenbacher update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); 56877be8da07SAndreas Gruenbacher 5688d0180171SAndreas Gruenbacher drbd_err(device, "Got NegDReply; Sector %llus, len %u.\n", 5689b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 5690b411b363SPhilipp Reisner 5691b30ab791SAndreas Gruenbacher return validate_req_change_req_state(device, p->block_id, sector, 5692b30ab791SAndreas Gruenbacher &device->read_requests, __func__, 56938554df1cSAndreas Gruenbacher NEG_ACKED, false); 5694b411b363SPhilipp Reisner } 5695b411b363SPhilipp Reisner 5696bde89a9eSAndreas Gruenbacher static int got_NegRSDReply(struct drbd_connection *connection, struct packet_info *pi) 5697b411b363SPhilipp Reisner { 56989f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 5699b30ab791SAndreas Gruenbacher struct drbd_device *device; 5700b411b363SPhilipp Reisner sector_t sector; 5701b411b363SPhilipp Reisner int size; 5702e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 57031952e916SAndreas Gruenbacher 57049f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 57059f4fe9adSAndreas Gruenbacher if (!peer_device) 57062735a594SAndreas Gruenbacher return -EIO; 57079f4fe9adSAndreas Gruenbacher device = peer_device->device; 5708b411b363SPhilipp Reisner 5709b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 5710b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 5711b411b363SPhilipp Reisner 571269a22773SAndreas Gruenbacher update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); 5713b411b363SPhilipp Reisner 5714b30ab791SAndreas Gruenbacher dec_rs_pending(device); 5715b411b363SPhilipp Reisner 5716b30ab791SAndreas Gruenbacher if (get_ldev_if_state(device, D_FAILED)) { 5717b30ab791SAndreas Gruenbacher drbd_rs_complete_io(device, sector); 5718e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 5719d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 5720b30ab791SAndreas Gruenbacher drbd_rs_failed_io(device, sector, size); 5721d612d309SPhilipp Reisner case P_RS_CANCEL: 5722d612d309SPhilipp Reisner break; 5723d612d309SPhilipp Reisner default: 57242735a594SAndreas Gruenbacher BUG(); 5725d612d309SPhilipp Reisner } 5726b30ab791SAndreas Gruenbacher put_ldev(device); 5727b411b363SPhilipp Reisner } 5728b411b363SPhilipp Reisner 57292735a594SAndreas Gruenbacher return 0; 5730b411b363SPhilipp Reisner } 5731b411b363SPhilipp Reisner 5732bde89a9eSAndreas Gruenbacher static int got_BarrierAck(struct drbd_connection *connection, struct packet_info *pi) 5733b411b363SPhilipp Reisner { 5734e658983aSAndreas Gruenbacher struct p_barrier_ack *p = pi->data; 5735c06ece6bSAndreas Gruenbacher struct drbd_peer_device *peer_device; 57369ed57dcbSLars Ellenberg int vnr; 5737b411b363SPhilipp Reisner 5738bde89a9eSAndreas Gruenbacher tl_release(connection, p->barrier, be32_to_cpu(p->set_size)); 5739b411b363SPhilipp Reisner 57409ed57dcbSLars Ellenberg rcu_read_lock(); 5741c06ece6bSAndreas Gruenbacher idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { 5742c06ece6bSAndreas Gruenbacher struct drbd_device *device = peer_device->device; 5743c06ece6bSAndreas Gruenbacher 5744b30ab791SAndreas Gruenbacher if (device->state.conn == C_AHEAD && 5745b30ab791SAndreas Gruenbacher atomic_read(&device->ap_in_flight) == 0 && 5746b30ab791SAndreas Gruenbacher !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &device->flags)) { 5747b30ab791SAndreas Gruenbacher device->start_resync_timer.expires = jiffies + HZ; 5748b30ab791SAndreas Gruenbacher add_timer(&device->start_resync_timer); 5749c4752ef1SPhilipp Reisner } 57509ed57dcbSLars Ellenberg } 57519ed57dcbSLars Ellenberg rcu_read_unlock(); 5752c4752ef1SPhilipp Reisner 57532735a594SAndreas Gruenbacher return 0; 5754b411b363SPhilipp Reisner } 5755b411b363SPhilipp Reisner 5756bde89a9eSAndreas Gruenbacher static int got_OVResult(struct drbd_connection *connection, struct packet_info *pi) 5757b411b363SPhilipp Reisner { 57589f4fe9adSAndreas Gruenbacher struct drbd_peer_device *peer_device; 5759b30ab791SAndreas Gruenbacher struct drbd_device *device; 5760e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 576184b8c06bSAndreas Gruenbacher struct drbd_device_work *dw; 5762b411b363SPhilipp Reisner sector_t sector; 5763b411b363SPhilipp Reisner int size; 5764b411b363SPhilipp Reisner 57659f4fe9adSAndreas Gruenbacher peer_device = conn_peer_device(connection, pi->vnr); 57669f4fe9adSAndreas Gruenbacher if (!peer_device) 57672735a594SAndreas Gruenbacher return -EIO; 57689f4fe9adSAndreas Gruenbacher device = peer_device->device; 57691952e916SAndreas Gruenbacher 5770b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 5771b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 5772b411b363SPhilipp Reisner 577369a22773SAndreas Gruenbacher update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); 5774b411b363SPhilipp Reisner 5775b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 5776b30ab791SAndreas Gruenbacher drbd_ov_out_of_sync_found(device, sector, size); 5777b411b363SPhilipp Reisner else 5778b30ab791SAndreas Gruenbacher ov_out_of_sync_print(device); 5779b411b363SPhilipp Reisner 5780b30ab791SAndreas Gruenbacher if (!get_ldev(device)) 57812735a594SAndreas Gruenbacher return 0; 57821d53f09eSLars Ellenberg 5783b30ab791SAndreas Gruenbacher drbd_rs_complete_io(device, sector); 5784b30ab791SAndreas Gruenbacher dec_rs_pending(device); 5785b411b363SPhilipp Reisner 5786b30ab791SAndreas Gruenbacher --device->ov_left; 5787ea5442afSLars Ellenberg 5788ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 5789b30ab791SAndreas Gruenbacher if ((device->ov_left & 0x200) == 0x200) 5790b30ab791SAndreas Gruenbacher drbd_advance_rs_marks(device, device->ov_left); 5791ea5442afSLars Ellenberg 5792b30ab791SAndreas Gruenbacher if (device->ov_left == 0) { 579384b8c06bSAndreas Gruenbacher dw = kmalloc(sizeof(*dw), GFP_NOIO); 579484b8c06bSAndreas Gruenbacher if (dw) { 579584b8c06bSAndreas Gruenbacher dw->w.cb = w_ov_finished; 579684b8c06bSAndreas Gruenbacher dw->device = device; 579784b8c06bSAndreas Gruenbacher drbd_queue_work(&peer_device->connection->sender_work, &dw->w); 5798b411b363SPhilipp Reisner } else { 579984b8c06bSAndreas Gruenbacher drbd_err(device, "kmalloc(dw) failed."); 5800b30ab791SAndreas Gruenbacher ov_out_of_sync_print(device); 5801b30ab791SAndreas Gruenbacher drbd_resync_finished(device); 5802b411b363SPhilipp Reisner } 5803b411b363SPhilipp Reisner } 5804b30ab791SAndreas Gruenbacher put_ldev(device); 58052735a594SAndreas Gruenbacher return 0; 5806b411b363SPhilipp Reisner } 5807b411b363SPhilipp Reisner 5808bde89a9eSAndreas Gruenbacher static int got_skip(struct drbd_connection *connection, struct packet_info *pi) 58090ced55a3SPhilipp Reisner { 58102735a594SAndreas Gruenbacher return 0; 58110ced55a3SPhilipp Reisner } 58120ced55a3SPhilipp Reisner 5813668700b4SPhilipp Reisner struct meta_sock_cmd { 5814b411b363SPhilipp Reisner size_t pkt_size; 5815bde89a9eSAndreas Gruenbacher int (*fn)(struct drbd_connection *connection, struct packet_info *); 5816b411b363SPhilipp Reisner }; 5817b411b363SPhilipp Reisner 5818668700b4SPhilipp Reisner static void set_rcvtimeo(struct drbd_connection *connection, bool ping_timeout) 5819668700b4SPhilipp Reisner { 5820668700b4SPhilipp Reisner long t; 5821668700b4SPhilipp Reisner struct net_conf *nc; 5822668700b4SPhilipp Reisner 5823668700b4SPhilipp Reisner rcu_read_lock(); 5824668700b4SPhilipp Reisner nc = rcu_dereference(connection->net_conf); 5825668700b4SPhilipp Reisner t = ping_timeout ? nc->ping_timeo : nc->ping_int; 5826668700b4SPhilipp Reisner rcu_read_unlock(); 5827668700b4SPhilipp Reisner 5828668700b4SPhilipp Reisner t *= HZ; 5829668700b4SPhilipp Reisner if (ping_timeout) 5830668700b4SPhilipp Reisner t /= 10; 5831668700b4SPhilipp Reisner 5832668700b4SPhilipp Reisner connection->meta.socket->sk->sk_rcvtimeo = t; 5833668700b4SPhilipp Reisner } 5834668700b4SPhilipp Reisner 5835668700b4SPhilipp Reisner static void set_ping_timeout(struct drbd_connection *connection) 5836668700b4SPhilipp Reisner { 5837668700b4SPhilipp Reisner set_rcvtimeo(connection, 1); 5838668700b4SPhilipp Reisner } 5839668700b4SPhilipp Reisner 5840668700b4SPhilipp Reisner static void set_idle_timeout(struct drbd_connection *connection) 5841668700b4SPhilipp Reisner { 5842668700b4SPhilipp Reisner set_rcvtimeo(connection, 0); 5843668700b4SPhilipp Reisner } 5844668700b4SPhilipp Reisner 5845668700b4SPhilipp Reisner static struct meta_sock_cmd ack_receiver_tbl[] = { 5846e658983aSAndreas Gruenbacher [P_PING] = { 0, got_Ping }, 5847e658983aSAndreas Gruenbacher [P_PING_ACK] = { 0, got_PingAck }, 5848b411b363SPhilipp Reisner [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 5849b411b363SPhilipp Reisner [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 5850b411b363SPhilipp Reisner [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 5851d4dabbe2SLars Ellenberg [P_SUPERSEDED] = { sizeof(struct p_block_ack), got_BlockAck }, 5852b411b363SPhilipp Reisner [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 5853b411b363SPhilipp Reisner [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 5854b411b363SPhilipp Reisner [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, 5855b411b363SPhilipp Reisner [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 5856b411b363SPhilipp Reisner [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 5857b411b363SPhilipp Reisner [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 5858b411b363SPhilipp Reisner [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 585902918be2SPhilipp Reisner [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 5860d612d309SPhilipp Reisner [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, 58611952e916SAndreas Gruenbacher [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, 58621952e916SAndreas Gruenbacher [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 5863b411b363SPhilipp Reisner }; 5864b411b363SPhilipp Reisner 58651c03e520SPhilipp Reisner int drbd_ack_receiver(struct drbd_thread *thi) 5866b411b363SPhilipp Reisner { 5867bde89a9eSAndreas Gruenbacher struct drbd_connection *connection = thi->connection; 5868668700b4SPhilipp Reisner struct meta_sock_cmd *cmd = NULL; 586977351055SPhilipp Reisner struct packet_info pi; 5870668700b4SPhilipp Reisner unsigned long pre_recv_jif; 5871257d0af6SPhilipp Reisner int rv; 5872bde89a9eSAndreas Gruenbacher void *buf = connection->meta.rbuf; 5873b411b363SPhilipp Reisner int received = 0; 5874bde89a9eSAndreas Gruenbacher unsigned int header_size = drbd_header_size(connection); 587552b061a4SAndreas Gruenbacher int expect = header_size; 587644ed167dSPhilipp Reisner bool ping_timeout_active = false; 58773990e04dSPhilipp Reisner struct sched_param param = { .sched_priority = 2 }; 5878b411b363SPhilipp Reisner 58793990e04dSPhilipp Reisner rv = sched_setscheduler(current, SCHED_RR, ¶m); 58803990e04dSPhilipp Reisner if (rv < 0) 5881668700b4SPhilipp Reisner drbd_err(connection, "drbd_ack_receiver: ERROR set priority, ret=%d\n", rv); 5882b411b363SPhilipp Reisner 5883e77a0a5cSAndreas Gruenbacher while (get_t_state(thi) == RUNNING) { 588480822284SPhilipp Reisner drbd_thread_current_set_cpu(thi); 588544ed167dSPhilipp Reisner 5886668700b4SPhilipp Reisner conn_reclaim_net_peer_reqs(connection); 588744ed167dSPhilipp Reisner 5888bde89a9eSAndreas Gruenbacher if (test_and_clear_bit(SEND_PING, &connection->flags)) { 5889bde89a9eSAndreas Gruenbacher if (drbd_send_ping(connection)) { 58901ec861ebSAndreas Gruenbacher drbd_err(connection, "drbd_send_ping has failed\n"); 5891841ce241SAndreas Gruenbacher goto reconnect; 5892841ce241SAndreas Gruenbacher } 5893668700b4SPhilipp Reisner set_ping_timeout(connection); 589444ed167dSPhilipp Reisner ping_timeout_active = true; 5895b411b363SPhilipp Reisner } 5896b411b363SPhilipp Reisner 5897668700b4SPhilipp Reisner pre_recv_jif = jiffies; 5898bde89a9eSAndreas Gruenbacher rv = drbd_recv_short(connection->meta.socket, buf, expect-received, 0); 5899b411b363SPhilipp Reisner 5900b411b363SPhilipp Reisner /* Note: 5901b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 5902b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 5903b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 5904b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 5905b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 5906b411b363SPhilipp Reisner * rv == expected: full header or command 5907b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 5908b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 5909b411b363SPhilipp Reisner */ 5910b411b363SPhilipp Reisner if (likely(rv > 0)) { 5911b411b363SPhilipp Reisner received += rv; 5912b411b363SPhilipp Reisner buf += rv; 5913b411b363SPhilipp Reisner } else if (rv == 0) { 5914bde89a9eSAndreas Gruenbacher if (test_bit(DISCONNECT_SENT, &connection->flags)) { 5915b66623e3SPhilipp Reisner long t; 5916b66623e3SPhilipp Reisner rcu_read_lock(); 5917bde89a9eSAndreas Gruenbacher t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; 5918b66623e3SPhilipp Reisner rcu_read_unlock(); 5919b66623e3SPhilipp Reisner 5920bde89a9eSAndreas Gruenbacher t = wait_event_timeout(connection->ping_wait, 5921bde89a9eSAndreas Gruenbacher connection->cstate < C_WF_REPORT_PARAMS, 5922b66623e3SPhilipp Reisner t); 5923599377acSPhilipp Reisner if (t) 5924599377acSPhilipp Reisner break; 5925599377acSPhilipp Reisner } 59261ec861ebSAndreas Gruenbacher drbd_err(connection, "meta connection shut down by peer.\n"); 5927b411b363SPhilipp Reisner goto reconnect; 5928b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 5929cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 5930cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 5931668700b4SPhilipp Reisner if (time_after(connection->last_received, pre_recv_jif)) 5932cb6518cbSLars Ellenberg continue; 5933f36af18cSLars Ellenberg if (ping_timeout_active) { 59341ec861ebSAndreas Gruenbacher drbd_err(connection, "PingAck did not arrive in time.\n"); 5935b411b363SPhilipp Reisner goto reconnect; 5936b411b363SPhilipp Reisner } 5937bde89a9eSAndreas Gruenbacher set_bit(SEND_PING, &connection->flags); 5938b411b363SPhilipp Reisner continue; 5939b411b363SPhilipp Reisner } else if (rv == -EINTR) { 5940668700b4SPhilipp Reisner /* maybe drbd_thread_stop(): the while condition will notice. 5941668700b4SPhilipp Reisner * maybe woken for send_ping: we'll send a ping above, 5942668700b4SPhilipp Reisner * and change the rcvtimeo */ 5943668700b4SPhilipp Reisner flush_signals(current); 5944b411b363SPhilipp Reisner continue; 5945b411b363SPhilipp Reisner } else { 59461ec861ebSAndreas Gruenbacher drbd_err(connection, "sock_recvmsg returned %d\n", rv); 5947b411b363SPhilipp Reisner goto reconnect; 5948b411b363SPhilipp Reisner } 5949b411b363SPhilipp Reisner 5950b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 5951bde89a9eSAndreas Gruenbacher if (decode_header(connection, connection->meta.rbuf, &pi)) 5952b411b363SPhilipp Reisner goto reconnect; 5953668700b4SPhilipp Reisner cmd = &ack_receiver_tbl[pi.cmd]; 5954668700b4SPhilipp Reisner if (pi.cmd >= ARRAY_SIZE(ack_receiver_tbl) || !cmd->fn) { 59551ec861ebSAndreas Gruenbacher drbd_err(connection, "Unexpected meta packet %s (0x%04x)\n", 59562fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.cmd); 5957b411b363SPhilipp Reisner goto disconnect; 5958b411b363SPhilipp Reisner } 5959e658983aSAndreas Gruenbacher expect = header_size + cmd->pkt_size; 596052b061a4SAndreas Gruenbacher if (pi.size != expect - header_size) { 59611ec861ebSAndreas Gruenbacher drbd_err(connection, "Wrong packet size on meta (c: %d, l: %d)\n", 596277351055SPhilipp Reisner pi.cmd, pi.size); 5963b411b363SPhilipp Reisner goto reconnect; 5964b411b363SPhilipp Reisner } 5965257d0af6SPhilipp Reisner } 5966b411b363SPhilipp Reisner if (received == expect) { 59672735a594SAndreas Gruenbacher bool err; 5968a4fbda8eSPhilipp Reisner 5969bde89a9eSAndreas Gruenbacher err = cmd->fn(connection, &pi); 59702735a594SAndreas Gruenbacher if (err) { 59711ec861ebSAndreas Gruenbacher drbd_err(connection, "%pf failed\n", cmd->fn); 5972b411b363SPhilipp Reisner goto reconnect; 59731952e916SAndreas Gruenbacher } 5974b411b363SPhilipp Reisner 5975bde89a9eSAndreas Gruenbacher connection->last_received = jiffies; 5976f36af18cSLars Ellenberg 5977668700b4SPhilipp Reisner if (cmd == &ack_receiver_tbl[P_PING_ACK]) { 5978668700b4SPhilipp Reisner set_idle_timeout(connection); 597944ed167dSPhilipp Reisner ping_timeout_active = false; 598044ed167dSPhilipp Reisner } 5981b411b363SPhilipp Reisner 5982bde89a9eSAndreas Gruenbacher buf = connection->meta.rbuf; 5983b411b363SPhilipp Reisner received = 0; 598452b061a4SAndreas Gruenbacher expect = header_size; 5985b411b363SPhilipp Reisner cmd = NULL; 5986b411b363SPhilipp Reisner } 5987b411b363SPhilipp Reisner } 5988b411b363SPhilipp Reisner 5989b411b363SPhilipp Reisner if (0) { 5990b411b363SPhilipp Reisner reconnect: 5991bde89a9eSAndreas Gruenbacher conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); 5992bde89a9eSAndreas Gruenbacher conn_md_sync(connection); 5993b411b363SPhilipp Reisner } 5994b411b363SPhilipp Reisner if (0) { 5995b411b363SPhilipp Reisner disconnect: 5996bde89a9eSAndreas Gruenbacher conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); 5997b411b363SPhilipp Reisner } 5998b411b363SPhilipp Reisner 5999668700b4SPhilipp Reisner drbd_info(connection, "ack_receiver terminated\n"); 6000b411b363SPhilipp Reisner 6001b411b363SPhilipp Reisner return 0; 6002b411b363SPhilipp Reisner } 6003668700b4SPhilipp Reisner 6004668700b4SPhilipp Reisner void drbd_send_acks_wf(struct work_struct *ws) 6005668700b4SPhilipp Reisner { 6006668700b4SPhilipp Reisner struct drbd_peer_device *peer_device = 6007668700b4SPhilipp Reisner container_of(ws, struct drbd_peer_device, send_acks_work); 6008668700b4SPhilipp Reisner struct drbd_connection *connection = peer_device->connection; 6009668700b4SPhilipp Reisner struct drbd_device *device = peer_device->device; 6010668700b4SPhilipp Reisner struct net_conf *nc; 6011668700b4SPhilipp Reisner int tcp_cork, err; 6012668700b4SPhilipp Reisner 6013668700b4SPhilipp Reisner rcu_read_lock(); 6014668700b4SPhilipp Reisner nc = rcu_dereference(connection->net_conf); 6015668700b4SPhilipp Reisner tcp_cork = nc->tcp_cork; 6016668700b4SPhilipp Reisner rcu_read_unlock(); 6017668700b4SPhilipp Reisner 6018668700b4SPhilipp Reisner if (tcp_cork) 6019668700b4SPhilipp Reisner drbd_tcp_cork(connection->meta.socket); 6020668700b4SPhilipp Reisner 6021668700b4SPhilipp Reisner err = drbd_finish_peer_reqs(device); 6022668700b4SPhilipp Reisner kref_put(&device->kref, drbd_destroy_device); 6023668700b4SPhilipp Reisner /* get is in drbd_endio_write_sec_final(). That is necessary to keep the 6024668700b4SPhilipp Reisner struct work_struct send_acks_work alive, which is in the peer_device object */ 6025668700b4SPhilipp Reisner 6026668700b4SPhilipp Reisner if (err) { 6027668700b4SPhilipp Reisner conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); 6028668700b4SPhilipp Reisner return; 6029668700b4SPhilipp Reisner } 6030668700b4SPhilipp Reisner 6031668700b4SPhilipp Reisner if (tcp_cork) 6032668700b4SPhilipp Reisner drbd_tcp_uncork(connection->meta.socket); 6033668700b4SPhilipp Reisner 6034668700b4SPhilipp Reisner return; 6035668700b4SPhilipp Reisner } 6036