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 28b411b363SPhilipp Reisner #include <asm/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" 47b411b363SPhilipp Reisner #include "drbd_req.h" 48b411b363SPhilipp Reisner 49b411b363SPhilipp Reisner #include "drbd_vli.h" 50b411b363SPhilipp Reisner 5177351055SPhilipp Reisner struct packet_info { 5277351055SPhilipp Reisner enum drbd_packet cmd; 53e2857216SAndreas Gruenbacher unsigned int size; 54e2857216SAndreas Gruenbacher unsigned int vnr; 55e658983aSAndreas Gruenbacher void *data; 5677351055SPhilipp Reisner }; 5777351055SPhilipp Reisner 58b411b363SPhilipp Reisner enum finish_epoch { 59b411b363SPhilipp Reisner FE_STILL_LIVE, 60b411b363SPhilipp Reisner FE_DESTROYED, 61b411b363SPhilipp Reisner FE_RECYCLED, 62b411b363SPhilipp Reisner }; 63b411b363SPhilipp Reisner 646038178eSAndreas Gruenbacher static int drbd_do_features(struct drbd_tconn *tconn); 6513e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn); 66360cc740SPhilipp Reisner static int drbd_disconnected(int vnr, void *p, void *data); 67b411b363SPhilipp Reisner 68b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); 6999920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *, int); 70b411b363SPhilipp Reisner 71b411b363SPhilipp Reisner 72b411b363SPhilipp Reisner #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) 73b411b363SPhilipp Reisner 7445bb912bSLars Ellenberg /* 7545bb912bSLars Ellenberg * some helper functions to deal with single linked page lists, 7645bb912bSLars Ellenberg * page->private being our "next" pointer. 7745bb912bSLars Ellenberg */ 7845bb912bSLars Ellenberg 7945bb912bSLars Ellenberg /* If at least n pages are linked at head, get n pages off. 8045bb912bSLars Ellenberg * Otherwise, don't modify head, and return NULL. 8145bb912bSLars Ellenberg * Locking is the responsibility of the caller. 8245bb912bSLars Ellenberg */ 8345bb912bSLars Ellenberg static struct page *page_chain_del(struct page **head, int n) 8445bb912bSLars Ellenberg { 8545bb912bSLars Ellenberg struct page *page; 8645bb912bSLars Ellenberg struct page *tmp; 8745bb912bSLars Ellenberg 8845bb912bSLars Ellenberg BUG_ON(!n); 8945bb912bSLars Ellenberg BUG_ON(!head); 9045bb912bSLars Ellenberg 9145bb912bSLars Ellenberg page = *head; 9223ce4227SPhilipp Reisner 9323ce4227SPhilipp Reisner if (!page) 9423ce4227SPhilipp Reisner return NULL; 9523ce4227SPhilipp Reisner 9645bb912bSLars Ellenberg while (page) { 9745bb912bSLars Ellenberg tmp = page_chain_next(page); 9845bb912bSLars Ellenberg if (--n == 0) 9945bb912bSLars Ellenberg break; /* found sufficient pages */ 10045bb912bSLars Ellenberg if (tmp == NULL) 10145bb912bSLars Ellenberg /* insufficient pages, don't use any of them. */ 10245bb912bSLars Ellenberg return NULL; 10345bb912bSLars Ellenberg page = tmp; 10445bb912bSLars Ellenberg } 10545bb912bSLars Ellenberg 10645bb912bSLars Ellenberg /* add end of list marker for the returned list */ 10745bb912bSLars Ellenberg set_page_private(page, 0); 10845bb912bSLars Ellenberg /* actual return value, and adjustment of head */ 10945bb912bSLars Ellenberg page = *head; 11045bb912bSLars Ellenberg *head = tmp; 11145bb912bSLars Ellenberg return page; 11245bb912bSLars Ellenberg } 11345bb912bSLars Ellenberg 11445bb912bSLars Ellenberg /* may be used outside of locks to find the tail of a (usually short) 11545bb912bSLars Ellenberg * "private" page chain, before adding it back to a global chain head 11645bb912bSLars Ellenberg * with page_chain_add() under a spinlock. */ 11745bb912bSLars Ellenberg static struct page *page_chain_tail(struct page *page, int *len) 11845bb912bSLars Ellenberg { 11945bb912bSLars Ellenberg struct page *tmp; 12045bb912bSLars Ellenberg int i = 1; 12145bb912bSLars Ellenberg while ((tmp = page_chain_next(page))) 12245bb912bSLars Ellenberg ++i, page = tmp; 12345bb912bSLars Ellenberg if (len) 12445bb912bSLars Ellenberg *len = i; 12545bb912bSLars Ellenberg return page; 12645bb912bSLars Ellenberg } 12745bb912bSLars Ellenberg 12845bb912bSLars Ellenberg static int page_chain_free(struct page *page) 12945bb912bSLars Ellenberg { 13045bb912bSLars Ellenberg struct page *tmp; 13145bb912bSLars Ellenberg int i = 0; 13245bb912bSLars Ellenberg page_chain_for_each_safe(page, tmp) { 13345bb912bSLars Ellenberg put_page(page); 13445bb912bSLars Ellenberg ++i; 13545bb912bSLars Ellenberg } 13645bb912bSLars Ellenberg return i; 13745bb912bSLars Ellenberg } 13845bb912bSLars Ellenberg 13945bb912bSLars Ellenberg static void page_chain_add(struct page **head, 14045bb912bSLars Ellenberg struct page *chain_first, struct page *chain_last) 14145bb912bSLars Ellenberg { 14245bb912bSLars Ellenberg #if 1 14345bb912bSLars Ellenberg struct page *tmp; 14445bb912bSLars Ellenberg tmp = page_chain_tail(chain_first, NULL); 14545bb912bSLars Ellenberg BUG_ON(tmp != chain_last); 14645bb912bSLars Ellenberg #endif 14745bb912bSLars Ellenberg 14845bb912bSLars Ellenberg /* add chain to head */ 14945bb912bSLars Ellenberg set_page_private(chain_last, (unsigned long)*head); 15045bb912bSLars Ellenberg *head = chain_first; 15145bb912bSLars Ellenberg } 15245bb912bSLars Ellenberg 15318c2d522SAndreas Gruenbacher static struct page *__drbd_alloc_pages(struct drbd_conf *mdev, 15418c2d522SAndreas Gruenbacher unsigned int number) 155b411b363SPhilipp Reisner { 156b411b363SPhilipp Reisner struct page *page = NULL; 15745bb912bSLars Ellenberg struct page *tmp = NULL; 15818c2d522SAndreas Gruenbacher unsigned int i = 0; 159b411b363SPhilipp Reisner 160b411b363SPhilipp Reisner /* Yes, testing drbd_pp_vacant outside the lock is racy. 161b411b363SPhilipp Reisner * So what. It saves a spin_lock. */ 16245bb912bSLars Ellenberg if (drbd_pp_vacant >= number) { 163b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 16445bb912bSLars Ellenberg page = page_chain_del(&drbd_pp_pool, number); 16545bb912bSLars Ellenberg if (page) 16645bb912bSLars Ellenberg drbd_pp_vacant -= number; 167b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 16845bb912bSLars Ellenberg if (page) 16945bb912bSLars Ellenberg return page; 170b411b363SPhilipp Reisner } 17145bb912bSLars Ellenberg 172b411b363SPhilipp Reisner /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD 173b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 174b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 17545bb912bSLars Ellenberg for (i = 0; i < number; i++) { 17645bb912bSLars Ellenberg tmp = alloc_page(GFP_TRY); 17745bb912bSLars Ellenberg if (!tmp) 17845bb912bSLars Ellenberg break; 17945bb912bSLars Ellenberg set_page_private(tmp, (unsigned long)page); 18045bb912bSLars Ellenberg page = tmp; 18145bb912bSLars Ellenberg } 18245bb912bSLars Ellenberg 18345bb912bSLars Ellenberg if (i == number) 184b411b363SPhilipp Reisner return page; 18545bb912bSLars Ellenberg 18645bb912bSLars Ellenberg /* Not enough pages immediately available this time. 187c37c8ecfSAndreas Gruenbacher * No need to jump around here, drbd_alloc_pages will retry this 18845bb912bSLars Ellenberg * function "soon". */ 18945bb912bSLars Ellenberg if (page) { 19045bb912bSLars Ellenberg tmp = page_chain_tail(page, NULL); 19145bb912bSLars Ellenberg spin_lock(&drbd_pp_lock); 19245bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 19345bb912bSLars Ellenberg drbd_pp_vacant += i; 19445bb912bSLars Ellenberg spin_unlock(&drbd_pp_lock); 19545bb912bSLars Ellenberg } 19645bb912bSLars Ellenberg return NULL; 197b411b363SPhilipp Reisner } 198b411b363SPhilipp Reisner 199a990be46SAndreas Gruenbacher static void reclaim_finished_net_peer_reqs(struct drbd_conf *mdev, 200a990be46SAndreas Gruenbacher struct list_head *to_be_freed) 201b411b363SPhilipp Reisner { 202db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 203b411b363SPhilipp Reisner struct list_head *le, *tle; 204b411b363SPhilipp Reisner 205b411b363SPhilipp Reisner /* The EEs are always appended to the end of the list. Since 206b411b363SPhilipp Reisner they are sent in order over the wire, they have to finish 207b411b363SPhilipp Reisner in order. As soon as we see the first not finished we can 208b411b363SPhilipp Reisner stop to examine the list... */ 209b411b363SPhilipp Reisner 210b411b363SPhilipp Reisner list_for_each_safe(le, tle, &mdev->net_ee) { 211db830c46SAndreas Gruenbacher peer_req = list_entry(le, struct drbd_peer_request, w.list); 212045417f7SAndreas Gruenbacher if (drbd_peer_req_has_active_page(peer_req)) 213b411b363SPhilipp Reisner break; 214b411b363SPhilipp Reisner list_move(le, to_be_freed); 215b411b363SPhilipp Reisner } 216b411b363SPhilipp Reisner } 217b411b363SPhilipp Reisner 218b411b363SPhilipp Reisner static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) 219b411b363SPhilipp Reisner { 220b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 221db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 222b411b363SPhilipp Reisner 22387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 224a990be46SAndreas Gruenbacher reclaim_finished_net_peer_reqs(mdev, &reclaimed); 22587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 226b411b363SPhilipp Reisner 227db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 2283967deb1SAndreas Gruenbacher drbd_free_net_peer_req(mdev, peer_req); 229b411b363SPhilipp Reisner } 230b411b363SPhilipp Reisner 231b411b363SPhilipp Reisner /** 232c37c8ecfSAndreas Gruenbacher * drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled) 233b411b363SPhilipp Reisner * @mdev: DRBD device. 23445bb912bSLars Ellenberg * @number: number of pages requested 23545bb912bSLars Ellenberg * @retry: whether to retry, if not enough pages are available right now 236b411b363SPhilipp Reisner * 23745bb912bSLars Ellenberg * Tries to allocate number pages, first from our own page pool, then from 23845bb912bSLars Ellenberg * the kernel, unless this allocation would exceed the max_buffers setting. 23945bb912bSLars Ellenberg * Possibly retry until DRBD frees sufficient pages somewhere else. 24045bb912bSLars Ellenberg * 24145bb912bSLars Ellenberg * Returns a page chain linked via page->private. 242b411b363SPhilipp Reisner */ 243c37c8ecfSAndreas Gruenbacher struct page *drbd_alloc_pages(struct drbd_conf *mdev, unsigned int number, 244c37c8ecfSAndreas Gruenbacher bool retry) 245b411b363SPhilipp Reisner { 246b411b363SPhilipp Reisner struct page *page = NULL; 24744ed167dSPhilipp Reisner struct net_conf *nc; 248b411b363SPhilipp Reisner DEFINE_WAIT(wait); 24944ed167dSPhilipp Reisner int mxb; 250b411b363SPhilipp Reisner 25145bb912bSLars Ellenberg /* Yes, we may run up to @number over max_buffers. If we 25245bb912bSLars Ellenberg * follow it strictly, the admin will get it wrong anyways. */ 25344ed167dSPhilipp Reisner rcu_read_lock(); 25444ed167dSPhilipp Reisner nc = rcu_dereference(mdev->tconn->net_conf); 25544ed167dSPhilipp Reisner mxb = nc ? nc->max_buffers : 1000000; 25644ed167dSPhilipp Reisner rcu_read_unlock(); 25744ed167dSPhilipp Reisner 25844ed167dSPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mxb) 25918c2d522SAndreas Gruenbacher page = __drbd_alloc_pages(mdev, number); 260b411b363SPhilipp Reisner 26145bb912bSLars Ellenberg while (page == NULL) { 262b411b363SPhilipp Reisner prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); 263b411b363SPhilipp Reisner 264b411b363SPhilipp Reisner drbd_kick_lo_and_reclaim_net(mdev); 265b411b363SPhilipp Reisner 26644ed167dSPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mxb) { 26718c2d522SAndreas Gruenbacher page = __drbd_alloc_pages(mdev, number); 268b411b363SPhilipp Reisner if (page) 269b411b363SPhilipp Reisner break; 270b411b363SPhilipp Reisner } 271b411b363SPhilipp Reisner 272b411b363SPhilipp Reisner if (!retry) 273b411b363SPhilipp Reisner break; 274b411b363SPhilipp Reisner 275b411b363SPhilipp Reisner if (signal_pending(current)) { 276c37c8ecfSAndreas Gruenbacher dev_warn(DEV, "drbd_alloc_pages interrupted!\n"); 277b411b363SPhilipp Reisner break; 278b411b363SPhilipp Reisner } 279b411b363SPhilipp Reisner 280b411b363SPhilipp Reisner schedule(); 281b411b363SPhilipp Reisner } 282b411b363SPhilipp Reisner finish_wait(&drbd_pp_wait, &wait); 283b411b363SPhilipp Reisner 28445bb912bSLars Ellenberg if (page) 28545bb912bSLars Ellenberg atomic_add(number, &mdev->pp_in_use); 286b411b363SPhilipp Reisner return page; 287b411b363SPhilipp Reisner } 288b411b363SPhilipp Reisner 289c37c8ecfSAndreas Gruenbacher /* Must not be used from irq, as that may deadlock: see drbd_alloc_pages. 29087eeee41SPhilipp Reisner * Is also used from inside an other spin_lock_irq(&mdev->tconn->req_lock); 29145bb912bSLars Ellenberg * Either links the page chain back to the global pool, 29245bb912bSLars Ellenberg * or returns all pages to the system. */ 2935cc287e0SAndreas Gruenbacher static void drbd_free_pages(struct drbd_conf *mdev, struct page *page, int is_net) 294b411b363SPhilipp Reisner { 295435f0740SLars Ellenberg atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use; 296b411b363SPhilipp Reisner int i; 297435f0740SLars Ellenberg 2981816a2b4SLars Ellenberg if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count) 29945bb912bSLars Ellenberg i = page_chain_free(page); 30045bb912bSLars Ellenberg else { 30145bb912bSLars Ellenberg struct page *tmp; 30245bb912bSLars Ellenberg tmp = page_chain_tail(page, &i); 303b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 30445bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 30545bb912bSLars Ellenberg drbd_pp_vacant += i; 306b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 307b411b363SPhilipp Reisner } 308435f0740SLars Ellenberg i = atomic_sub_return(i, a); 30945bb912bSLars Ellenberg if (i < 0) 310435f0740SLars Ellenberg dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n", 311435f0740SLars Ellenberg is_net ? "pp_in_use_by_net" : "pp_in_use", i); 312b411b363SPhilipp Reisner wake_up(&drbd_pp_wait); 313b411b363SPhilipp Reisner } 314b411b363SPhilipp Reisner 315b411b363SPhilipp Reisner /* 316b411b363SPhilipp Reisner You need to hold the req_lock: 317b411b363SPhilipp Reisner _drbd_wait_ee_list_empty() 318b411b363SPhilipp Reisner 319b411b363SPhilipp Reisner You must not have the req_lock: 3203967deb1SAndreas Gruenbacher drbd_free_peer_req() 3210db55363SAndreas Gruenbacher drbd_alloc_peer_req() 3227721f567SAndreas Gruenbacher drbd_free_peer_reqs() 323b411b363SPhilipp Reisner drbd_ee_fix_bhs() 324a990be46SAndreas Gruenbacher drbd_finish_peer_reqs() 325b411b363SPhilipp Reisner drbd_clear_done_ee() 326b411b363SPhilipp Reisner drbd_wait_ee_list_empty() 327b411b363SPhilipp Reisner */ 328b411b363SPhilipp Reisner 329f6ffca9fSAndreas Gruenbacher struct drbd_peer_request * 3300db55363SAndreas Gruenbacher drbd_alloc_peer_req(struct drbd_conf *mdev, u64 id, sector_t sector, 331f6ffca9fSAndreas Gruenbacher unsigned int data_size, gfp_t gfp_mask) __must_hold(local) 332b411b363SPhilipp Reisner { 333db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 334b411b363SPhilipp Reisner struct page *page; 33545bb912bSLars Ellenberg unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; 336b411b363SPhilipp Reisner 3370cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE)) 338b411b363SPhilipp Reisner return NULL; 339b411b363SPhilipp Reisner 340db830c46SAndreas Gruenbacher peer_req = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); 341db830c46SAndreas Gruenbacher if (!peer_req) { 342b411b363SPhilipp Reisner if (!(gfp_mask & __GFP_NOWARN)) 3430db55363SAndreas Gruenbacher dev_err(DEV, "%s: allocation failed\n", __func__); 344b411b363SPhilipp Reisner return NULL; 345b411b363SPhilipp Reisner } 346b411b363SPhilipp Reisner 347c37c8ecfSAndreas Gruenbacher page = drbd_alloc_pages(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); 34845bb912bSLars Ellenberg if (!page) 34945bb912bSLars Ellenberg goto fail; 350b411b363SPhilipp Reisner 351db830c46SAndreas Gruenbacher drbd_clear_interval(&peer_req->i); 352db830c46SAndreas Gruenbacher peer_req->i.size = data_size; 353db830c46SAndreas Gruenbacher peer_req->i.sector = sector; 354db830c46SAndreas Gruenbacher peer_req->i.local = false; 355db830c46SAndreas Gruenbacher peer_req->i.waiting = false; 35653840641SAndreas Gruenbacher 357db830c46SAndreas Gruenbacher peer_req->epoch = NULL; 358a21e9298SPhilipp Reisner peer_req->w.mdev = mdev; 359db830c46SAndreas Gruenbacher peer_req->pages = page; 360db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, 0); 361db830c46SAndreas Gruenbacher peer_req->flags = 0; 3629a8e7753SAndreas Gruenbacher /* 3639a8e7753SAndreas Gruenbacher * The block_id is opaque to the receiver. It is not endianness 3649a8e7753SAndreas Gruenbacher * converted, and sent back to the sender unchanged. 3659a8e7753SAndreas Gruenbacher */ 366db830c46SAndreas Gruenbacher peer_req->block_id = id; 367b411b363SPhilipp Reisner 368db830c46SAndreas Gruenbacher return peer_req; 369b411b363SPhilipp Reisner 37045bb912bSLars Ellenberg fail: 371db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 372b411b363SPhilipp Reisner return NULL; 373b411b363SPhilipp Reisner } 374b411b363SPhilipp Reisner 3753967deb1SAndreas Gruenbacher void __drbd_free_peer_req(struct drbd_conf *mdev, struct drbd_peer_request *peer_req, 376f6ffca9fSAndreas Gruenbacher int is_net) 377b411b363SPhilipp Reisner { 378db830c46SAndreas Gruenbacher if (peer_req->flags & EE_HAS_DIGEST) 379db830c46SAndreas Gruenbacher kfree(peer_req->digest); 3805cc287e0SAndreas Gruenbacher drbd_free_pages(mdev, peer_req->pages, is_net); 381db830c46SAndreas Gruenbacher D_ASSERT(atomic_read(&peer_req->pending_bios) == 0); 382db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 383db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 384b411b363SPhilipp Reisner } 385b411b363SPhilipp Reisner 3867721f567SAndreas Gruenbacher int drbd_free_peer_reqs(struct drbd_conf *mdev, struct list_head *list) 387b411b363SPhilipp Reisner { 388b411b363SPhilipp Reisner LIST_HEAD(work_list); 389db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 390b411b363SPhilipp Reisner int count = 0; 391435f0740SLars Ellenberg int is_net = list == &mdev->net_ee; 392b411b363SPhilipp Reisner 39387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 394b411b363SPhilipp Reisner list_splice_init(list, &work_list); 39587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 396b411b363SPhilipp Reisner 397db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 3983967deb1SAndreas Gruenbacher __drbd_free_peer_req(mdev, peer_req, is_net); 399b411b363SPhilipp Reisner count++; 400b411b363SPhilipp Reisner } 401b411b363SPhilipp Reisner return count; 402b411b363SPhilipp Reisner } 403b411b363SPhilipp Reisner 404a990be46SAndreas Gruenbacher /* 405a990be46SAndreas Gruenbacher * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. 406b411b363SPhilipp Reisner */ 407a990be46SAndreas Gruenbacher static int drbd_finish_peer_reqs(struct drbd_conf *mdev) 408b411b363SPhilipp Reisner { 409b411b363SPhilipp Reisner LIST_HEAD(work_list); 410b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 411db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 412e2b3032bSAndreas Gruenbacher int err = 0; 413b411b363SPhilipp Reisner 41487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 415a990be46SAndreas Gruenbacher reclaim_finished_net_peer_reqs(mdev, &reclaimed); 416b411b363SPhilipp Reisner list_splice_init(&mdev->done_ee, &work_list); 41787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 418b411b363SPhilipp Reisner 419db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 4203967deb1SAndreas Gruenbacher drbd_free_net_peer_req(mdev, peer_req); 421b411b363SPhilipp Reisner 422b411b363SPhilipp Reisner /* possible callbacks here: 4237be8da07SAndreas Gruenbacher * e_end_block, and e_end_resync_block, e_send_discard_write. 424b411b363SPhilipp Reisner * all ignore the last argument. 425b411b363SPhilipp Reisner */ 426db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 427e2b3032bSAndreas Gruenbacher int err2; 428e2b3032bSAndreas Gruenbacher 429b411b363SPhilipp Reisner /* list_del not necessary, next/prev members not touched */ 430e2b3032bSAndreas Gruenbacher err2 = peer_req->w.cb(&peer_req->w, !!err); 431e2b3032bSAndreas Gruenbacher if (!err) 432e2b3032bSAndreas Gruenbacher err = err2; 4333967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 434b411b363SPhilipp Reisner } 435b411b363SPhilipp Reisner wake_up(&mdev->ee_wait); 436b411b363SPhilipp Reisner 437e2b3032bSAndreas Gruenbacher return err; 438b411b363SPhilipp Reisner } 439b411b363SPhilipp Reisner 440d4da1537SAndreas Gruenbacher static void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, 441d4da1537SAndreas Gruenbacher struct list_head *head) 442b411b363SPhilipp Reisner { 443b411b363SPhilipp Reisner DEFINE_WAIT(wait); 444b411b363SPhilipp Reisner 445b411b363SPhilipp Reisner /* avoids spin_lock/unlock 446b411b363SPhilipp Reisner * and calling prepare_to_wait in the fast path */ 447b411b363SPhilipp Reisner while (!list_empty(head)) { 448b411b363SPhilipp Reisner prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); 44987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4507eaceaccSJens Axboe io_schedule(); 451b411b363SPhilipp Reisner finish_wait(&mdev->ee_wait, &wait); 45287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 453b411b363SPhilipp Reisner } 454b411b363SPhilipp Reisner } 455b411b363SPhilipp Reisner 456d4da1537SAndreas Gruenbacher static void drbd_wait_ee_list_empty(struct drbd_conf *mdev, 457d4da1537SAndreas Gruenbacher struct list_head *head) 458b411b363SPhilipp Reisner { 45987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 460b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, head); 46187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 462b411b363SPhilipp Reisner } 463b411b363SPhilipp Reisner 464b411b363SPhilipp Reisner /* see also kernel_accept; which is only present since 2.6.18. 465b411b363SPhilipp Reisner * also we want to log which part of it failed, exactly */ 4667653620dSPhilipp Reisner static int drbd_accept(const char **what, struct socket *sock, struct socket **newsock) 467b411b363SPhilipp Reisner { 468b411b363SPhilipp Reisner struct sock *sk = sock->sk; 469b411b363SPhilipp Reisner int err = 0; 470b411b363SPhilipp Reisner 471b411b363SPhilipp Reisner *what = "listen"; 472b411b363SPhilipp Reisner err = sock->ops->listen(sock, 5); 473b411b363SPhilipp Reisner if (err < 0) 474b411b363SPhilipp Reisner goto out; 475b411b363SPhilipp Reisner 476b411b363SPhilipp Reisner *what = "sock_create_lite"; 477b411b363SPhilipp Reisner err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 478b411b363SPhilipp Reisner newsock); 479b411b363SPhilipp Reisner if (err < 0) 480b411b363SPhilipp Reisner goto out; 481b411b363SPhilipp Reisner 482b411b363SPhilipp Reisner *what = "accept"; 483b411b363SPhilipp Reisner err = sock->ops->accept(sock, *newsock, 0); 484b411b363SPhilipp Reisner if (err < 0) { 485b411b363SPhilipp Reisner sock_release(*newsock); 486b411b363SPhilipp Reisner *newsock = NULL; 487b411b363SPhilipp Reisner goto out; 488b411b363SPhilipp Reisner } 489b411b363SPhilipp Reisner (*newsock)->ops = sock->ops; 490b411b363SPhilipp Reisner 491b411b363SPhilipp Reisner out: 492b411b363SPhilipp Reisner return err; 493b411b363SPhilipp Reisner } 494b411b363SPhilipp Reisner 495dbd9eea0SPhilipp Reisner static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) 496b411b363SPhilipp Reisner { 497b411b363SPhilipp Reisner mm_segment_t oldfs; 498b411b363SPhilipp Reisner struct kvec iov = { 499b411b363SPhilipp Reisner .iov_base = buf, 500b411b363SPhilipp Reisner .iov_len = size, 501b411b363SPhilipp Reisner }; 502b411b363SPhilipp Reisner struct msghdr msg = { 503b411b363SPhilipp Reisner .msg_iovlen = 1, 504b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 505b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 506b411b363SPhilipp Reisner }; 507b411b363SPhilipp Reisner int rv; 508b411b363SPhilipp Reisner 509b411b363SPhilipp Reisner oldfs = get_fs(); 510b411b363SPhilipp Reisner set_fs(KERNEL_DS); 511b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 512b411b363SPhilipp Reisner set_fs(oldfs); 513b411b363SPhilipp Reisner 514b411b363SPhilipp Reisner return rv; 515b411b363SPhilipp Reisner } 516b411b363SPhilipp Reisner 517de0ff338SPhilipp Reisner static int drbd_recv(struct drbd_tconn *tconn, void *buf, size_t size) 518b411b363SPhilipp Reisner { 519b411b363SPhilipp Reisner mm_segment_t oldfs; 520b411b363SPhilipp Reisner struct kvec iov = { 521b411b363SPhilipp Reisner .iov_base = buf, 522b411b363SPhilipp Reisner .iov_len = size, 523b411b363SPhilipp Reisner }; 524b411b363SPhilipp Reisner struct msghdr msg = { 525b411b363SPhilipp Reisner .msg_iovlen = 1, 526b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 527b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 528b411b363SPhilipp Reisner }; 529b411b363SPhilipp Reisner int rv; 530b411b363SPhilipp Reisner 531b411b363SPhilipp Reisner oldfs = get_fs(); 532b411b363SPhilipp Reisner set_fs(KERNEL_DS); 533b411b363SPhilipp Reisner 534b411b363SPhilipp Reisner for (;;) { 535de0ff338SPhilipp Reisner rv = sock_recvmsg(tconn->data.socket, &msg, size, msg.msg_flags); 536b411b363SPhilipp Reisner if (rv == size) 537b411b363SPhilipp Reisner break; 538b411b363SPhilipp Reisner 539b411b363SPhilipp Reisner /* Note: 540b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 541b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 542b411b363SPhilipp Reisner */ 543b411b363SPhilipp Reisner 544b411b363SPhilipp Reisner if (rv < 0) { 545b411b363SPhilipp Reisner if (rv == -ECONNRESET) 546de0ff338SPhilipp Reisner conn_info(tconn, "sock was reset by peer\n"); 547b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 548de0ff338SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 549b411b363SPhilipp Reisner break; 550b411b363SPhilipp Reisner } else if (rv == 0) { 551de0ff338SPhilipp Reisner conn_info(tconn, "sock was shut down by peer\n"); 552b411b363SPhilipp Reisner break; 553b411b363SPhilipp Reisner } else { 554b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 555b411b363SPhilipp Reisner * after we read a partial message 556b411b363SPhilipp Reisner */ 557b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 558b411b363SPhilipp Reisner break; 559b411b363SPhilipp Reisner } 560b411b363SPhilipp Reisner }; 561b411b363SPhilipp Reisner 562b411b363SPhilipp Reisner set_fs(oldfs); 563b411b363SPhilipp Reisner 564b411b363SPhilipp Reisner if (rv != size) 565bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); 566b411b363SPhilipp Reisner 567b411b363SPhilipp Reisner return rv; 568b411b363SPhilipp Reisner } 569b411b363SPhilipp Reisner 570c6967746SAndreas Gruenbacher static int drbd_recv_all(struct drbd_tconn *tconn, void *buf, size_t size) 571c6967746SAndreas Gruenbacher { 572c6967746SAndreas Gruenbacher int err; 573c6967746SAndreas Gruenbacher 574c6967746SAndreas Gruenbacher err = drbd_recv(tconn, buf, size); 575c6967746SAndreas Gruenbacher if (err != size) { 576c6967746SAndreas Gruenbacher if (err >= 0) 577c6967746SAndreas Gruenbacher err = -EIO; 578c6967746SAndreas Gruenbacher } else 579c6967746SAndreas Gruenbacher err = 0; 580c6967746SAndreas Gruenbacher return err; 581c6967746SAndreas Gruenbacher } 582c6967746SAndreas Gruenbacher 583a5c31904SAndreas Gruenbacher static int drbd_recv_all_warn(struct drbd_tconn *tconn, void *buf, size_t size) 584a5c31904SAndreas Gruenbacher { 585a5c31904SAndreas Gruenbacher int err; 586a5c31904SAndreas Gruenbacher 587a5c31904SAndreas Gruenbacher err = drbd_recv_all(tconn, buf, size); 588a5c31904SAndreas Gruenbacher if (err && !signal_pending(current)) 589a5c31904SAndreas Gruenbacher conn_warn(tconn, "short read (expected size %d)\n", (int)size); 590a5c31904SAndreas Gruenbacher return err; 591a5c31904SAndreas Gruenbacher } 592a5c31904SAndreas Gruenbacher 5935dbf1673SLars Ellenberg /* quoting tcp(7): 5945dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5955dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5965dbf1673SLars Ellenberg * This is our wrapper to do so. 5975dbf1673SLars Ellenberg */ 5985dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 5995dbf1673SLars Ellenberg unsigned int rcv) 6005dbf1673SLars Ellenberg { 6015dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 6025dbf1673SLars Ellenberg if (snd) { 6035dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 6045dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 6055dbf1673SLars Ellenberg } 6065dbf1673SLars Ellenberg if (rcv) { 6075dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 6085dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 6095dbf1673SLars Ellenberg } 6105dbf1673SLars Ellenberg } 6115dbf1673SLars Ellenberg 612eac3e990SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_tconn *tconn) 613b411b363SPhilipp Reisner { 614b411b363SPhilipp Reisner const char *what; 615b411b363SPhilipp Reisner struct socket *sock; 616b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 61744ed167dSPhilipp Reisner struct sockaddr_in6 peer_in6; 61844ed167dSPhilipp Reisner struct net_conf *nc; 61944ed167dSPhilipp Reisner int err, peer_addr_len, my_addr_len; 62044ed167dSPhilipp Reisner int sndbuf_size, rcvbuf_size, try_connect_int; 621b411b363SPhilipp Reisner int disconnect_on_error = 1; 622b411b363SPhilipp Reisner 62344ed167dSPhilipp Reisner rcu_read_lock(); 62444ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 62544ed167dSPhilipp Reisner if (!nc) { 62644ed167dSPhilipp Reisner rcu_read_unlock(); 627b411b363SPhilipp Reisner return NULL; 62844ed167dSPhilipp Reisner } 62944ed167dSPhilipp Reisner 63044ed167dSPhilipp Reisner sndbuf_size = nc->sndbuf_size; 63144ed167dSPhilipp Reisner rcvbuf_size = nc->rcvbuf_size; 63244ed167dSPhilipp Reisner try_connect_int = nc->try_connect_int; 63344ed167dSPhilipp Reisner 63444ed167dSPhilipp Reisner my_addr_len = min_t(int, nc->my_addr_len, sizeof(src_in6)); 63544ed167dSPhilipp Reisner memcpy(&src_in6, nc->my_addr, my_addr_len); 63644ed167dSPhilipp Reisner 63744ed167dSPhilipp Reisner if (((struct sockaddr *)nc->my_addr)->sa_family == AF_INET6) 63844ed167dSPhilipp Reisner src_in6.sin6_port = 0; 63944ed167dSPhilipp Reisner else 64044ed167dSPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 64144ed167dSPhilipp Reisner 64244ed167dSPhilipp Reisner peer_addr_len = min_t(int, nc->peer_addr_len, sizeof(src_in6)); 64344ed167dSPhilipp Reisner memcpy(&peer_in6, nc->peer_addr, peer_addr_len); 64444ed167dSPhilipp Reisner 64544ed167dSPhilipp Reisner rcu_read_unlock(); 646b411b363SPhilipp Reisner 647b411b363SPhilipp Reisner what = "sock_create_kern"; 64844ed167dSPhilipp Reisner err = sock_create_kern(((struct sockaddr *)&src_in6)->sa_family, 649b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 650b411b363SPhilipp Reisner if (err < 0) { 651b411b363SPhilipp Reisner sock = NULL; 652b411b363SPhilipp Reisner goto out; 653b411b363SPhilipp Reisner } 654b411b363SPhilipp Reisner 655b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 65644ed167dSPhilipp Reisner sock->sk->sk_sndtimeo = try_connect_int * HZ; 65744ed167dSPhilipp Reisner drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); 658b411b363SPhilipp Reisner 659b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 660b411b363SPhilipp Reisner * for the outgoing connections. 661b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 662b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 663b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 664b411b363SPhilipp Reisner * a free one dynamically. 665b411b363SPhilipp Reisner */ 666b411b363SPhilipp Reisner what = "bind before connect"; 66744ed167dSPhilipp Reisner err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); 668b411b363SPhilipp Reisner if (err < 0) 669b411b363SPhilipp Reisner goto out; 670b411b363SPhilipp Reisner 671b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 672b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 673b411b363SPhilipp Reisner disconnect_on_error = 0; 674b411b363SPhilipp Reisner what = "connect"; 67544ed167dSPhilipp Reisner err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); 676b411b363SPhilipp Reisner 677b411b363SPhilipp Reisner out: 678b411b363SPhilipp Reisner if (err < 0) { 679b411b363SPhilipp Reisner if (sock) { 680b411b363SPhilipp Reisner sock_release(sock); 681b411b363SPhilipp Reisner sock = NULL; 682b411b363SPhilipp Reisner } 683b411b363SPhilipp Reisner switch (-err) { 684b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 685b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 686b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 687b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 688b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 689b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 690b411b363SPhilipp Reisner disconnect_on_error = 0; 691b411b363SPhilipp Reisner break; 692b411b363SPhilipp Reisner default: 693eac3e990SPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 694b411b363SPhilipp Reisner } 695b411b363SPhilipp Reisner if (disconnect_on_error) 696bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 697b411b363SPhilipp Reisner } 69844ed167dSPhilipp Reisner 699b411b363SPhilipp Reisner return sock; 700b411b363SPhilipp Reisner } 701b411b363SPhilipp Reisner 7027653620dSPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_tconn *tconn) 703b411b363SPhilipp Reisner { 70444ed167dSPhilipp Reisner int timeo, err, my_addr_len; 70544ed167dSPhilipp Reisner int sndbuf_size, rcvbuf_size, try_connect_int; 706b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 70744ed167dSPhilipp Reisner struct sockaddr_in6 my_addr; 70844ed167dSPhilipp Reisner struct net_conf *nc; 709b411b363SPhilipp Reisner const char *what; 710b411b363SPhilipp Reisner 71144ed167dSPhilipp Reisner rcu_read_lock(); 71244ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 71344ed167dSPhilipp Reisner if (!nc) { 71444ed167dSPhilipp Reisner rcu_read_unlock(); 715b411b363SPhilipp Reisner return NULL; 71644ed167dSPhilipp Reisner } 71744ed167dSPhilipp Reisner 71844ed167dSPhilipp Reisner sndbuf_size = nc->sndbuf_size; 71944ed167dSPhilipp Reisner rcvbuf_size = nc->rcvbuf_size; 72044ed167dSPhilipp Reisner try_connect_int = nc->try_connect_int; 72144ed167dSPhilipp Reisner 72244ed167dSPhilipp Reisner my_addr_len = min_t(int, nc->my_addr_len, sizeof(struct sockaddr_in6)); 72344ed167dSPhilipp Reisner memcpy(&my_addr, nc->my_addr, my_addr_len); 72444ed167dSPhilipp Reisner rcu_read_unlock(); 725b411b363SPhilipp Reisner 726b411b363SPhilipp Reisner what = "sock_create_kern"; 72744ed167dSPhilipp Reisner err = sock_create_kern(((struct sockaddr *)&my_addr)->sa_family, 728b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 729b411b363SPhilipp Reisner if (err) { 730b411b363SPhilipp Reisner s_listen = NULL; 731b411b363SPhilipp Reisner goto out; 732b411b363SPhilipp Reisner } 733b411b363SPhilipp Reisner 73444ed167dSPhilipp Reisner timeo = try_connect_int * HZ; 735b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 736b411b363SPhilipp Reisner 737b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 738b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 739b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 74044ed167dSPhilipp Reisner drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); 741b411b363SPhilipp Reisner 742b411b363SPhilipp Reisner what = "bind before listen"; 74344ed167dSPhilipp Reisner err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); 744b411b363SPhilipp Reisner if (err < 0) 745b411b363SPhilipp Reisner goto out; 746b411b363SPhilipp Reisner 7477653620dSPhilipp Reisner err = drbd_accept(&what, s_listen, &s_estab); 748b411b363SPhilipp Reisner 749b411b363SPhilipp Reisner out: 750b411b363SPhilipp Reisner if (s_listen) 751b411b363SPhilipp Reisner sock_release(s_listen); 752b411b363SPhilipp Reisner if (err < 0) { 753b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 7547653620dSPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 755bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 756b411b363SPhilipp Reisner } 757b411b363SPhilipp Reisner } 758b411b363SPhilipp Reisner 759b411b363SPhilipp Reisner return s_estab; 760b411b363SPhilipp Reisner } 761b411b363SPhilipp Reisner 762e658983aSAndreas Gruenbacher static int decode_header(struct drbd_tconn *, void *, struct packet_info *); 763b411b363SPhilipp Reisner 7649f5bdc33SAndreas Gruenbacher static int send_first_packet(struct drbd_tconn *tconn, struct drbd_socket *sock, 7659f5bdc33SAndreas Gruenbacher enum drbd_packet cmd) 7669f5bdc33SAndreas Gruenbacher { 7679f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) 7689f5bdc33SAndreas Gruenbacher return -EIO; 769e658983aSAndreas Gruenbacher return conn_send_command(tconn, sock, cmd, 0, NULL, 0); 770b411b363SPhilipp Reisner } 771b411b363SPhilipp Reisner 7729f5bdc33SAndreas Gruenbacher static int receive_first_packet(struct drbd_tconn *tconn, struct socket *sock) 773b411b363SPhilipp Reisner { 7749f5bdc33SAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 7759f5bdc33SAndreas Gruenbacher struct packet_info pi; 7769f5bdc33SAndreas Gruenbacher int err; 777b411b363SPhilipp Reisner 7789f5bdc33SAndreas Gruenbacher err = drbd_recv_short(sock, tconn->data.rbuf, header_size, 0); 7799f5bdc33SAndreas Gruenbacher if (err != header_size) { 7809f5bdc33SAndreas Gruenbacher if (err >= 0) 7819f5bdc33SAndreas Gruenbacher err = -EIO; 7829f5bdc33SAndreas Gruenbacher return err; 7839f5bdc33SAndreas Gruenbacher } 7849f5bdc33SAndreas Gruenbacher err = decode_header(tconn, tconn->data.rbuf, &pi); 7859f5bdc33SAndreas Gruenbacher if (err) 7869f5bdc33SAndreas Gruenbacher return err; 7879f5bdc33SAndreas Gruenbacher return pi.cmd; 788b411b363SPhilipp Reisner } 789b411b363SPhilipp Reisner 790b411b363SPhilipp Reisner /** 791b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 792b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 793b411b363SPhilipp Reisner */ 794dbd9eea0SPhilipp Reisner static int drbd_socket_okay(struct socket **sock) 795b411b363SPhilipp Reisner { 796b411b363SPhilipp Reisner int rr; 797b411b363SPhilipp Reisner char tb[4]; 798b411b363SPhilipp Reisner 799b411b363SPhilipp Reisner if (!*sock) 80081e84650SAndreas Gruenbacher return false; 801b411b363SPhilipp Reisner 802dbd9eea0SPhilipp Reisner rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 803b411b363SPhilipp Reisner 804b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 80581e84650SAndreas Gruenbacher return true; 806b411b363SPhilipp Reisner } else { 807b411b363SPhilipp Reisner sock_release(*sock); 808b411b363SPhilipp Reisner *sock = NULL; 80981e84650SAndreas Gruenbacher return false; 810b411b363SPhilipp Reisner } 811b411b363SPhilipp Reisner } 8122325eb66SPhilipp Reisner /* Gets called if a connection is established, or if a new minor gets created 8132325eb66SPhilipp Reisner in a connection */ 8142325eb66SPhilipp Reisner int drbd_connected(int vnr, void *p, void *data) 815907599e0SPhilipp Reisner { 816907599e0SPhilipp Reisner struct drbd_conf *mdev = (struct drbd_conf *)p; 8170829f5edSAndreas Gruenbacher int err; 818907599e0SPhilipp Reisner 819907599e0SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 820907599e0SPhilipp Reisner mdev->peer_seq = 0; 821907599e0SPhilipp Reisner 8228410da8fSPhilipp Reisner mdev->state_mutex = mdev->tconn->agreed_pro_version < 100 ? 8238410da8fSPhilipp Reisner &mdev->tconn->cstate_mutex : 8248410da8fSPhilipp Reisner &mdev->own_state_mutex; 8258410da8fSPhilipp Reisner 8260829f5edSAndreas Gruenbacher err = drbd_send_sync_param(mdev); 8270829f5edSAndreas Gruenbacher if (!err) 8280829f5edSAndreas Gruenbacher err = drbd_send_sizes(mdev, 0, 0); 8290829f5edSAndreas Gruenbacher if (!err) 8300829f5edSAndreas Gruenbacher err = drbd_send_uuids(mdev); 8310829f5edSAndreas Gruenbacher if (!err) 8320829f5edSAndreas Gruenbacher err = drbd_send_state(mdev); 833907599e0SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 834907599e0SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 8358b924f1dSPhilipp Reisner mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ 8360829f5edSAndreas Gruenbacher return err; 837907599e0SPhilipp Reisner } 838907599e0SPhilipp Reisner 839b411b363SPhilipp Reisner /* 840b411b363SPhilipp Reisner * return values: 841b411b363SPhilipp Reisner * 1 yes, we have a valid connection 842b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 843b411b363SPhilipp Reisner * -1 peer talks different language, 844b411b363SPhilipp Reisner * no point in trying again, please go standalone. 845b411b363SPhilipp Reisner * -2 We do not have a network config... 846b411b363SPhilipp Reisner */ 847907599e0SPhilipp Reisner static int drbd_connect(struct drbd_tconn *tconn) 848b411b363SPhilipp Reisner { 8492bf89621SAndreas Gruenbacher struct socket *sock, *msock; 85044ed167dSPhilipp Reisner struct net_conf *nc; 85144ed167dSPhilipp Reisner int timeout, try, h, ok; 852b411b363SPhilipp Reisner 853bbeb641cSPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) 854b411b363SPhilipp Reisner return -2; 855b411b363SPhilipp Reisner 856907599e0SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &tconn->flags); 8570916e0e3SAndreas Gruenbacher 8580916e0e3SAndreas Gruenbacher /* Assume that the peer only understands protocol 80 until we know better. */ 8590916e0e3SAndreas Gruenbacher tconn->agreed_pro_version = 80; 860b411b363SPhilipp Reisner 861b411b363SPhilipp Reisner do { 8622bf89621SAndreas Gruenbacher struct socket *s; 8632bf89621SAndreas Gruenbacher 864b411b363SPhilipp Reisner for (try = 0;;) { 865b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 866907599e0SPhilipp Reisner s = drbd_try_connect(tconn); 867b411b363SPhilipp Reisner if (s || ++try >= 3) 868b411b363SPhilipp Reisner break; 869b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 87020ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 871b411b363SPhilipp Reisner } 872b411b363SPhilipp Reisner 873b411b363SPhilipp Reisner if (s) { 8742bf89621SAndreas Gruenbacher if (!tconn->data.socket) { 8752bf89621SAndreas Gruenbacher tconn->data.socket = s; 8769f5bdc33SAndreas Gruenbacher send_first_packet(tconn, &tconn->data, P_INITIAL_DATA); 8772bf89621SAndreas Gruenbacher } else if (!tconn->meta.socket) { 8782bf89621SAndreas Gruenbacher tconn->meta.socket = s; 8799f5bdc33SAndreas Gruenbacher send_first_packet(tconn, &tconn->meta, P_INITIAL_META); 880b411b363SPhilipp Reisner } else { 881907599e0SPhilipp Reisner conn_err(tconn, "Logic error in drbd_connect()\n"); 882b411b363SPhilipp Reisner goto out_release_sockets; 883b411b363SPhilipp Reisner } 884b411b363SPhilipp Reisner } 885b411b363SPhilipp Reisner 8862bf89621SAndreas Gruenbacher if (tconn->data.socket && tconn->meta.socket) { 887907599e0SPhilipp Reisner schedule_timeout_interruptible(tconn->net_conf->ping_timeo*HZ/10); 8882bf89621SAndreas Gruenbacher ok = drbd_socket_okay(&tconn->data.socket); 8892bf89621SAndreas Gruenbacher ok = drbd_socket_okay(&tconn->meta.socket) && ok; 890b411b363SPhilipp Reisner if (ok) 891b411b363SPhilipp Reisner break; 892b411b363SPhilipp Reisner } 893b411b363SPhilipp Reisner 894b411b363SPhilipp Reisner retry: 895907599e0SPhilipp Reisner s = drbd_wait_for_connect(tconn); 896b411b363SPhilipp Reisner if (s) { 8979f5bdc33SAndreas Gruenbacher try = receive_first_packet(tconn, s); 8982bf89621SAndreas Gruenbacher drbd_socket_okay(&tconn->data.socket); 8992bf89621SAndreas Gruenbacher drbd_socket_okay(&tconn->meta.socket); 900b411b363SPhilipp Reisner switch (try) { 901e5d6f33aSAndreas Gruenbacher case P_INITIAL_DATA: 9022bf89621SAndreas Gruenbacher if (tconn->data.socket) { 903907599e0SPhilipp Reisner conn_warn(tconn, "initial packet S crossed\n"); 9042bf89621SAndreas Gruenbacher sock_release(tconn->data.socket); 905b411b363SPhilipp Reisner } 9062bf89621SAndreas Gruenbacher tconn->data.socket = s; 907b411b363SPhilipp Reisner break; 908e5d6f33aSAndreas Gruenbacher case P_INITIAL_META: 9092bf89621SAndreas Gruenbacher if (tconn->meta.socket) { 910907599e0SPhilipp Reisner conn_warn(tconn, "initial packet M crossed\n"); 9112bf89621SAndreas Gruenbacher sock_release(tconn->meta.socket); 912b411b363SPhilipp Reisner } 9132bf89621SAndreas Gruenbacher tconn->meta.socket = s; 914907599e0SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &tconn->flags); 915b411b363SPhilipp Reisner break; 916b411b363SPhilipp Reisner default: 917907599e0SPhilipp Reisner conn_warn(tconn, "Error receiving initial packet\n"); 918b411b363SPhilipp Reisner sock_release(s); 919b411b363SPhilipp Reisner if (random32() & 1) 920b411b363SPhilipp Reisner goto retry; 921b411b363SPhilipp Reisner } 922b411b363SPhilipp Reisner } 923b411b363SPhilipp Reisner 924bbeb641cSPhilipp Reisner if (tconn->cstate <= C_DISCONNECTING) 925b411b363SPhilipp Reisner goto out_release_sockets; 926b411b363SPhilipp Reisner if (signal_pending(current)) { 927b411b363SPhilipp Reisner flush_signals(current); 928b411b363SPhilipp Reisner smp_rmb(); 929907599e0SPhilipp Reisner if (get_t_state(&tconn->receiver) == EXITING) 930b411b363SPhilipp Reisner goto out_release_sockets; 931b411b363SPhilipp Reisner } 932b411b363SPhilipp Reisner 9332bf89621SAndreas Gruenbacher if (tconn->data.socket && &tconn->meta.socket) { 9342bf89621SAndreas Gruenbacher ok = drbd_socket_okay(&tconn->data.socket); 9352bf89621SAndreas Gruenbacher ok = drbd_socket_okay(&tconn->meta.socket) && ok; 936b411b363SPhilipp Reisner if (ok) 937b411b363SPhilipp Reisner break; 938b411b363SPhilipp Reisner } 939b411b363SPhilipp Reisner } while (1); 940b411b363SPhilipp Reisner 9412bf89621SAndreas Gruenbacher sock = tconn->data.socket; 9422bf89621SAndreas Gruenbacher msock = tconn->meta.socket; 9432bf89621SAndreas Gruenbacher 944b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 945b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 946b411b363SPhilipp Reisner 947b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 948b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 949b411b363SPhilipp Reisner 950b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 951b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 952b411b363SPhilipp Reisner 953b411b363SPhilipp Reisner /* NOT YET ... 954907599e0SPhilipp Reisner * sock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; 955b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 9566038178eSAndreas Gruenbacher * first set it to the P_CONNECTION_FEATURES timeout, 957b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 95844ed167dSPhilipp Reisner rcu_read_lock(); 95944ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 960b411b363SPhilipp Reisner 96144ed167dSPhilipp Reisner sock->sk->sk_sndtimeo = 96244ed167dSPhilipp Reisner sock->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; 96344ed167dSPhilipp Reisner 96444ed167dSPhilipp Reisner msock->sk->sk_rcvtimeo = nc->ping_int*HZ; 96544ed167dSPhilipp Reisner timeout = nc->timeout * HZ / 10; 96644ed167dSPhilipp Reisner rcu_read_unlock(); 96744ed167dSPhilipp Reisner 96844ed167dSPhilipp Reisner msock->sk->sk_sndtimeo = timeout; 969b411b363SPhilipp Reisner 970b411b363SPhilipp Reisner /* we don't want delays. 97125985edcSLucas De Marchi * we use TCP_CORK where appropriate, though */ 972b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 973b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 974b411b363SPhilipp Reisner 975907599e0SPhilipp Reisner tconn->last_received = jiffies; 976b411b363SPhilipp Reisner 9776038178eSAndreas Gruenbacher h = drbd_do_features(tconn); 978b411b363SPhilipp Reisner if (h <= 0) 979b411b363SPhilipp Reisner return h; 980b411b363SPhilipp Reisner 981907599e0SPhilipp Reisner if (tconn->cram_hmac_tfm) { 982b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 983907599e0SPhilipp Reisner switch (drbd_do_auth(tconn)) { 984b10d96cbSJohannes Thoma case -1: 985907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed\n"); 986b411b363SPhilipp Reisner return -1; 987b10d96cbSJohannes Thoma case 0: 988907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed, trying again.\n"); 989b10d96cbSJohannes Thoma return 0; 990b411b363SPhilipp Reisner } 991b411b363SPhilipp Reisner } 992b411b363SPhilipp Reisner 993bbeb641cSPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE) < SS_SUCCESS) 994b411b363SPhilipp Reisner return 0; 995b411b363SPhilipp Reisner 99644ed167dSPhilipp Reisner sock->sk->sk_sndtimeo = timeout; 997b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 998b411b363SPhilipp Reisner 999907599e0SPhilipp Reisner drbd_thread_start(&tconn->asender); 1000b411b363SPhilipp Reisner 1001387eb308SAndreas Gruenbacher if (drbd_send_protocol(tconn) == -EOPNOTSUPP) 10027e2455c1SPhilipp Reisner return -1; 1003b411b363SPhilipp Reisner 1004d3fcb490SPhilipp Reisner down_read(&drbd_cfg_rwsem); 1005d3fcb490SPhilipp Reisner h = !idr_for_each(&tconn->volumes, drbd_connected, tconn); 1006d3fcb490SPhilipp Reisner up_read(&drbd_cfg_rwsem); 1007d3fcb490SPhilipp Reisner return h; 1008b411b363SPhilipp Reisner 1009b411b363SPhilipp Reisner out_release_sockets: 10102bf89621SAndreas Gruenbacher if (tconn->data.socket) { 10112bf89621SAndreas Gruenbacher sock_release(tconn->data.socket); 10122bf89621SAndreas Gruenbacher tconn->data.socket = NULL; 10132bf89621SAndreas Gruenbacher } 10142bf89621SAndreas Gruenbacher if (tconn->meta.socket) { 10152bf89621SAndreas Gruenbacher sock_release(tconn->meta.socket); 10162bf89621SAndreas Gruenbacher tconn->meta.socket = NULL; 10172bf89621SAndreas Gruenbacher } 1018b411b363SPhilipp Reisner return -1; 1019b411b363SPhilipp Reisner } 1020b411b363SPhilipp Reisner 1021e658983aSAndreas Gruenbacher static int decode_header(struct drbd_tconn *tconn, void *header, struct packet_info *pi) 1022b411b363SPhilipp Reisner { 1023e658983aSAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 1024e658983aSAndreas Gruenbacher 10250c8e36d9SAndreas Gruenbacher if (header_size == sizeof(struct p_header100) && 10260c8e36d9SAndreas Gruenbacher *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { 10270c8e36d9SAndreas Gruenbacher struct p_header100 *h = header; 10280c8e36d9SAndreas Gruenbacher if (h->pad != 0) { 10290c8e36d9SAndreas Gruenbacher conn_err(tconn, "Header padding is not zero\n"); 10300c8e36d9SAndreas Gruenbacher return -EINVAL; 10310c8e36d9SAndreas Gruenbacher } 10320c8e36d9SAndreas Gruenbacher pi->vnr = be16_to_cpu(h->volume); 10330c8e36d9SAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 10340c8e36d9SAndreas Gruenbacher pi->size = be32_to_cpu(h->length); 10350c8e36d9SAndreas Gruenbacher } else if (header_size == sizeof(struct p_header95) && 1036e658983aSAndreas Gruenbacher *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { 1037e658983aSAndreas Gruenbacher struct p_header95 *h = header; 1038e658983aSAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 1039b55d84baSAndreas Gruenbacher pi->size = be32_to_cpu(h->length); 1040eefc2f7dSPhilipp Reisner pi->vnr = 0; 1041e658983aSAndreas Gruenbacher } else if (header_size == sizeof(struct p_header80) && 1042e658983aSAndreas Gruenbacher *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { 1043e658983aSAndreas Gruenbacher struct p_header80 *h = header; 1044e658983aSAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 1045e658983aSAndreas Gruenbacher pi->size = be16_to_cpu(h->length); 104677351055SPhilipp Reisner pi->vnr = 0; 104702918be2SPhilipp Reisner } else { 1048e658983aSAndreas Gruenbacher conn_err(tconn, "Wrong magic value 0x%08x in protocol version %d\n", 1049e658983aSAndreas Gruenbacher be32_to_cpu(*(__be32 *)header), 1050e658983aSAndreas Gruenbacher tconn->agreed_pro_version); 10518172f3e9SAndreas Gruenbacher return -EINVAL; 1052b411b363SPhilipp Reisner } 1053e658983aSAndreas Gruenbacher pi->data = header + header_size; 10548172f3e9SAndreas Gruenbacher return 0; 1055257d0af6SPhilipp Reisner } 1056257d0af6SPhilipp Reisner 10579ba7aa00SPhilipp Reisner static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi) 1058257d0af6SPhilipp Reisner { 1059e658983aSAndreas Gruenbacher void *buffer = tconn->data.rbuf; 106069bc7bc3SAndreas Gruenbacher int err; 1061257d0af6SPhilipp Reisner 1062e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, buffer, drbd_header_size(tconn)); 1063a5c31904SAndreas Gruenbacher if (err) 106469bc7bc3SAndreas Gruenbacher return err; 1065257d0af6SPhilipp Reisner 1066e658983aSAndreas Gruenbacher err = decode_header(tconn, buffer, pi); 10679ba7aa00SPhilipp Reisner tconn->last_received = jiffies; 1068b411b363SPhilipp Reisner 106969bc7bc3SAndreas Gruenbacher return err; 1070b411b363SPhilipp Reisner } 1071b411b363SPhilipp Reisner 10722451fc3bSPhilipp Reisner static void drbd_flush(struct drbd_conf *mdev) 1073b411b363SPhilipp Reisner { 1074b411b363SPhilipp Reisner int rv; 1075b411b363SPhilipp Reisner 1076b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 1077fbd9b09aSDmitry Monakhov rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, 1078dd3932edSChristoph Hellwig NULL); 1079b411b363SPhilipp Reisner if (rv) { 1080b411b363SPhilipp Reisner dev_err(DEV, "local disk flush failed with status %d\n", rv); 1081b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 1082b411b363SPhilipp Reisner * don't try again for ANY return value != 0 1083b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 1084b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 1085b411b363SPhilipp Reisner } 1086b411b363SPhilipp Reisner put_ldev(mdev); 1087b411b363SPhilipp Reisner } 1088b411b363SPhilipp Reisner } 1089b411b363SPhilipp Reisner 1090b411b363SPhilipp Reisner /** 1091b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 1092b411b363SPhilipp Reisner * @mdev: DRBD device. 1093b411b363SPhilipp Reisner * @epoch: Epoch object. 1094b411b363SPhilipp Reisner * @ev: Epoch event. 1095b411b363SPhilipp Reisner */ 1096b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 1097b411b363SPhilipp Reisner struct drbd_epoch *epoch, 1098b411b363SPhilipp Reisner enum epoch_event ev) 1099b411b363SPhilipp Reisner { 11002451fc3bSPhilipp Reisner int epoch_size; 1101b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 1102b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 1103b411b363SPhilipp Reisner 1104b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1105b411b363SPhilipp Reisner do { 1106b411b363SPhilipp Reisner next_epoch = NULL; 1107b411b363SPhilipp Reisner 1108b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 1109b411b363SPhilipp Reisner 1110b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 1111b411b363SPhilipp Reisner case EV_PUT: 1112b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1113b411b363SPhilipp Reisner break; 1114b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1115b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1116b411b363SPhilipp Reisner break; 1117b411b363SPhilipp Reisner case EV_BECAME_LAST: 1118b411b363SPhilipp Reisner /* nothing to do*/ 1119b411b363SPhilipp Reisner break; 1120b411b363SPhilipp Reisner } 1121b411b363SPhilipp Reisner 1122b411b363SPhilipp Reisner if (epoch_size != 0 && 1123b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 11242451fc3bSPhilipp Reisner test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) { 1125b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1126b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1127b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1128b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1129b411b363SPhilipp Reisner } 1130b411b363SPhilipp Reisner dec_unacked(mdev); 1131b411b363SPhilipp Reisner 1132b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1133b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1134b411b363SPhilipp Reisner list_del(&epoch->list); 1135b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1136b411b363SPhilipp Reisner mdev->epochs--; 1137b411b363SPhilipp Reisner kfree(epoch); 1138b411b363SPhilipp Reisner 1139b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1140b411b363SPhilipp Reisner rv = FE_DESTROYED; 1141b411b363SPhilipp Reisner } else { 1142b411b363SPhilipp Reisner epoch->flags = 0; 1143b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1144698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1145b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1146b411b363SPhilipp Reisner rv = FE_RECYCLED; 11472451fc3bSPhilipp Reisner wake_up(&mdev->ee_wait); 1148b411b363SPhilipp Reisner } 1149b411b363SPhilipp Reisner } 1150b411b363SPhilipp Reisner 1151b411b363SPhilipp Reisner if (!next_epoch) 1152b411b363SPhilipp Reisner break; 1153b411b363SPhilipp Reisner 1154b411b363SPhilipp Reisner epoch = next_epoch; 1155b411b363SPhilipp Reisner } while (1); 1156b411b363SPhilipp Reisner 1157b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1158b411b363SPhilipp Reisner 1159b411b363SPhilipp Reisner return rv; 1160b411b363SPhilipp Reisner } 1161b411b363SPhilipp Reisner 1162b411b363SPhilipp Reisner /** 1163b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1164b411b363SPhilipp Reisner * @mdev: DRBD device. 1165b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1166b411b363SPhilipp Reisner */ 1167b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1168b411b363SPhilipp Reisner { 1169b411b363SPhilipp Reisner enum write_ordering_e pwo; 1170b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1171b411b363SPhilipp Reisner [WO_none] = "none", 1172b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1173b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1174b411b363SPhilipp Reisner }; 1175b411b363SPhilipp Reisner 1176b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1177b411b363SPhilipp Reisner wo = min(pwo, wo); 1178b411b363SPhilipp Reisner if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) 1179b411b363SPhilipp Reisner wo = WO_drain_io; 1180b411b363SPhilipp Reisner if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) 1181b411b363SPhilipp Reisner wo = WO_none; 1182b411b363SPhilipp Reisner mdev->write_ordering = wo; 11832451fc3bSPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bdev_flush) 1184b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1185b411b363SPhilipp Reisner } 1186b411b363SPhilipp Reisner 1187b411b363SPhilipp Reisner /** 1188fbe29decSAndreas Gruenbacher * drbd_submit_peer_request() 118945bb912bSLars Ellenberg * @mdev: DRBD device. 1190db830c46SAndreas Gruenbacher * @peer_req: peer request 119145bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 119210f6d992SLars Ellenberg * 119310f6d992SLars Ellenberg * May spread the pages to multiple bios, 119410f6d992SLars Ellenberg * depending on bio_add_page restrictions. 119510f6d992SLars Ellenberg * 119610f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 119710f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 119810f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 119910f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 120010f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 120110f6d992SLars Ellenberg * on certain Xen deployments. 120245bb912bSLars Ellenberg */ 120345bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 1204fbe29decSAndreas Gruenbacher int drbd_submit_peer_request(struct drbd_conf *mdev, 1205fbe29decSAndreas Gruenbacher struct drbd_peer_request *peer_req, 120645bb912bSLars Ellenberg const unsigned rw, const int fault_type) 120745bb912bSLars Ellenberg { 120845bb912bSLars Ellenberg struct bio *bios = NULL; 120945bb912bSLars Ellenberg struct bio *bio; 1210db830c46SAndreas Gruenbacher struct page *page = peer_req->pages; 1211db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1212db830c46SAndreas Gruenbacher unsigned ds = peer_req->i.size; 121345bb912bSLars Ellenberg unsigned n_bios = 0; 121445bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 121510f6d992SLars Ellenberg int err = -ENOMEM; 121645bb912bSLars Ellenberg 121745bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 121845bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 121945bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 1220da4a75d2SLars Ellenberg * request in more than one bio. 1221da4a75d2SLars Ellenberg * 1222da4a75d2SLars Ellenberg * Plain bio_alloc is good enough here, this is no DRBD internally 1223da4a75d2SLars Ellenberg * generated bio, but a bio allocated on behalf of the peer. 1224da4a75d2SLars Ellenberg */ 122545bb912bSLars Ellenberg next_bio: 122645bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 122745bb912bSLars Ellenberg if (!bio) { 122845bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 122945bb912bSLars Ellenberg goto fail; 123045bb912bSLars Ellenberg } 1231db830c46SAndreas Gruenbacher /* > peer_req->i.sector, unless this is the first bio */ 123245bb912bSLars Ellenberg bio->bi_sector = sector; 123345bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 123445bb912bSLars Ellenberg bio->bi_rw = rw; 1235db830c46SAndreas Gruenbacher bio->bi_private = peer_req; 1236fcefa62eSAndreas Gruenbacher bio->bi_end_io = drbd_peer_request_endio; 123745bb912bSLars Ellenberg 123845bb912bSLars Ellenberg bio->bi_next = bios; 123945bb912bSLars Ellenberg bios = bio; 124045bb912bSLars Ellenberg ++n_bios; 124145bb912bSLars Ellenberg 124245bb912bSLars Ellenberg page_chain_for_each(page) { 124345bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 124445bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 124510f6d992SLars Ellenberg /* A single page must always be possible! 124610f6d992SLars Ellenberg * But in case it fails anyways, 124710f6d992SLars Ellenberg * we deal with it, and complain (below). */ 124810f6d992SLars Ellenberg if (bio->bi_vcnt == 0) { 124910f6d992SLars Ellenberg dev_err(DEV, 125010f6d992SLars Ellenberg "bio_add_page failed for len=%u, " 125110f6d992SLars Ellenberg "bi_vcnt=0 (bi_sector=%llu)\n", 125210f6d992SLars Ellenberg len, (unsigned long long)bio->bi_sector); 125310f6d992SLars Ellenberg err = -ENOSPC; 125410f6d992SLars Ellenberg goto fail; 125510f6d992SLars Ellenberg } 125645bb912bSLars Ellenberg goto next_bio; 125745bb912bSLars Ellenberg } 125845bb912bSLars Ellenberg ds -= len; 125945bb912bSLars Ellenberg sector += len >> 9; 126045bb912bSLars Ellenberg --nr_pages; 126145bb912bSLars Ellenberg } 126245bb912bSLars Ellenberg D_ASSERT(page == NULL); 126345bb912bSLars Ellenberg D_ASSERT(ds == 0); 126445bb912bSLars Ellenberg 1265db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, n_bios); 126645bb912bSLars Ellenberg do { 126745bb912bSLars Ellenberg bio = bios; 126845bb912bSLars Ellenberg bios = bios->bi_next; 126945bb912bSLars Ellenberg bio->bi_next = NULL; 127045bb912bSLars Ellenberg 127145bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 127245bb912bSLars Ellenberg } while (bios); 127345bb912bSLars Ellenberg return 0; 127445bb912bSLars Ellenberg 127545bb912bSLars Ellenberg fail: 127645bb912bSLars Ellenberg while (bios) { 127745bb912bSLars Ellenberg bio = bios; 127845bb912bSLars Ellenberg bios = bios->bi_next; 127945bb912bSLars Ellenberg bio_put(bio); 128045bb912bSLars Ellenberg } 128110f6d992SLars Ellenberg return err; 128245bb912bSLars Ellenberg } 128345bb912bSLars Ellenberg 128453840641SAndreas Gruenbacher static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, 1285db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req) 128653840641SAndreas Gruenbacher { 1287db830c46SAndreas Gruenbacher struct drbd_interval *i = &peer_req->i; 128853840641SAndreas Gruenbacher 128953840641SAndreas Gruenbacher drbd_remove_interval(&mdev->write_requests, i); 129053840641SAndreas Gruenbacher drbd_clear_interval(i); 129153840641SAndreas Gruenbacher 12926c852becSAndreas Gruenbacher /* Wake up any processes waiting for this peer request to complete. */ 129353840641SAndreas Gruenbacher if (i->waiting) 129453840641SAndreas Gruenbacher wake_up(&mdev->misc_wait); 129553840641SAndreas Gruenbacher } 129653840641SAndreas Gruenbacher 12974a76b161SAndreas Gruenbacher static int receive_Barrier(struct drbd_tconn *tconn, struct packet_info *pi) 1298b411b363SPhilipp Reisner { 12994a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 13002451fc3bSPhilipp Reisner int rv; 1301e658983aSAndreas Gruenbacher struct p_barrier *p = pi->data; 1302b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1303b411b363SPhilipp Reisner 13044a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 13054a76b161SAndreas Gruenbacher if (!mdev) 13064a76b161SAndreas Gruenbacher return -EIO; 13074a76b161SAndreas Gruenbacher 1308b411b363SPhilipp Reisner inc_unacked(mdev); 1309b411b363SPhilipp Reisner 1310b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1311b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1312b411b363SPhilipp Reisner 1313b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1314b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1315b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1316b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1317b411b363SPhilipp Reisner * completed. */ 1318b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1319b411b363SPhilipp Reisner case WO_none: 1320b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 132182bc0194SAndreas Gruenbacher return 0; 1322b411b363SPhilipp Reisner 1323b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1324b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1325b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 13262451fc3bSPhilipp Reisner if (epoch) 13272451fc3bSPhilipp Reisner break; 13282451fc3bSPhilipp Reisner else 1329b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 13302451fc3bSPhilipp Reisner /* Fall through */ 13312451fc3bSPhilipp Reisner 13322451fc3bSPhilipp Reisner case WO_bdev_flush: 13332451fc3bSPhilipp Reisner case WO_drain_io: 1334b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 13352451fc3bSPhilipp Reisner drbd_flush(mdev); 13362451fc3bSPhilipp Reisner 13372451fc3bSPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 13382451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 13392451fc3bSPhilipp Reisner if (epoch) 13402451fc3bSPhilipp Reisner break; 1341b411b363SPhilipp Reisner } 1342b411b363SPhilipp Reisner 13432451fc3bSPhilipp Reisner epoch = mdev->current_epoch; 13442451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 13452451fc3bSPhilipp Reisner 13462451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 13472451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1348b411b363SPhilipp Reisner 134982bc0194SAndreas Gruenbacher return 0; 13502451fc3bSPhilipp Reisner default: 13512451fc3bSPhilipp Reisner dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); 135282bc0194SAndreas Gruenbacher return -EIO; 1353b411b363SPhilipp Reisner } 1354b411b363SPhilipp Reisner 1355b411b363SPhilipp Reisner epoch->flags = 0; 1356b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1357b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1358b411b363SPhilipp Reisner 1359b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1360b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1361b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1362b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1363b411b363SPhilipp Reisner mdev->epochs++; 1364b411b363SPhilipp Reisner } else { 1365b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1366b411b363SPhilipp Reisner kfree(epoch); 1367b411b363SPhilipp Reisner } 1368b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1369b411b363SPhilipp Reisner 137082bc0194SAndreas Gruenbacher return 0; 1371b411b363SPhilipp Reisner } 1372b411b363SPhilipp Reisner 1373b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1374b411b363SPhilipp Reisner * and from receive_Data */ 1375f6ffca9fSAndreas Gruenbacher static struct drbd_peer_request * 1376f6ffca9fSAndreas Gruenbacher read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, 1377f6ffca9fSAndreas Gruenbacher int data_size) __must_hold(local) 1378b411b363SPhilipp Reisner { 13796666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1380db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1381b411b363SPhilipp Reisner struct page *page; 1382a5c31904SAndreas Gruenbacher int dgs, ds, err; 1383a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1384a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 13856b4388acSPhilipp Reisner unsigned long *data; 1386b411b363SPhilipp Reisner 1387a0638456SPhilipp Reisner dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? 1388a0638456SPhilipp Reisner crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; 1389b411b363SPhilipp Reisner 1390b411b363SPhilipp Reisner if (dgs) { 13919f5bdc33SAndreas Gruenbacher /* 13929f5bdc33SAndreas Gruenbacher * FIXME: Receive the incoming digest into the receive buffer 13939f5bdc33SAndreas Gruenbacher * here, together with its struct p_data? 13949f5bdc33SAndreas Gruenbacher */ 1395a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1396a5c31904SAndreas Gruenbacher if (err) 1397b411b363SPhilipp Reisner return NULL; 1398b411b363SPhilipp Reisner } 1399b411b363SPhilipp Reisner 1400b411b363SPhilipp Reisner data_size -= dgs; 1401b411b363SPhilipp Reisner 1402841ce241SAndreas Gruenbacher if (!expect(data_size != 0)) 1403841ce241SAndreas Gruenbacher return NULL; 1404841ce241SAndreas Gruenbacher if (!expect(IS_ALIGNED(data_size, 512))) 1405841ce241SAndreas Gruenbacher return NULL; 1406841ce241SAndreas Gruenbacher if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) 1407841ce241SAndreas Gruenbacher return NULL; 1408b411b363SPhilipp Reisner 14096666032aSLars Ellenberg /* even though we trust out peer, 14106666032aSLars Ellenberg * we sometimes have to double check. */ 14116666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1412fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1413fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 14146666032aSLars Ellenberg (unsigned long long)capacity, 14156666032aSLars Ellenberg (unsigned long long)sector, data_size); 14166666032aSLars Ellenberg return NULL; 14176666032aSLars Ellenberg } 14186666032aSLars Ellenberg 1419b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1420b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1421b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 14220db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, id, sector, data_size, GFP_NOIO); 1423db830c46SAndreas Gruenbacher if (!peer_req) 1424b411b363SPhilipp Reisner return NULL; 142545bb912bSLars Ellenberg 1426b411b363SPhilipp Reisner ds = data_size; 1427db830c46SAndreas Gruenbacher page = peer_req->pages; 142845bb912bSLars Ellenberg page_chain_for_each(page) { 142945bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 14306b4388acSPhilipp Reisner data = kmap(page); 1431a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 14320cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 14336b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 14346b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 14356b4388acSPhilipp Reisner } 1436b411b363SPhilipp Reisner kunmap(page); 1437a5c31904SAndreas Gruenbacher if (err) { 14383967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1439b411b363SPhilipp Reisner return NULL; 1440b411b363SPhilipp Reisner } 1441a5c31904SAndreas Gruenbacher ds -= len; 1442b411b363SPhilipp Reisner } 1443b411b363SPhilipp Reisner 1444b411b363SPhilipp Reisner if (dgs) { 1445db830c46SAndreas Gruenbacher drbd_csum_ee(mdev, mdev->tconn->integrity_r_tfm, peer_req, dig_vv); 1446b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1447470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1448470be44aSLars Ellenberg (unsigned long long)sector, data_size); 14493967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1450b411b363SPhilipp Reisner return NULL; 1451b411b363SPhilipp Reisner } 1452b411b363SPhilipp Reisner } 1453b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1454db830c46SAndreas Gruenbacher return peer_req; 1455b411b363SPhilipp Reisner } 1456b411b363SPhilipp Reisner 1457b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1458b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1459b411b363SPhilipp Reisner */ 1460b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1461b411b363SPhilipp Reisner { 1462b411b363SPhilipp Reisner struct page *page; 1463a5c31904SAndreas Gruenbacher int err = 0; 1464b411b363SPhilipp Reisner void *data; 1465b411b363SPhilipp Reisner 1466c3470cdeSLars Ellenberg if (!data_size) 1467fc5be839SAndreas Gruenbacher return 0; 1468c3470cdeSLars Ellenberg 1469c37c8ecfSAndreas Gruenbacher page = drbd_alloc_pages(mdev, 1, 1); 1470b411b363SPhilipp Reisner 1471b411b363SPhilipp Reisner data = kmap(page); 1472b411b363SPhilipp Reisner while (data_size) { 1473fc5be839SAndreas Gruenbacher unsigned int len = min_t(int, data_size, PAGE_SIZE); 1474fc5be839SAndreas Gruenbacher 1475a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 1476a5c31904SAndreas Gruenbacher if (err) 1477b411b363SPhilipp Reisner break; 1478a5c31904SAndreas Gruenbacher data_size -= len; 1479b411b363SPhilipp Reisner } 1480b411b363SPhilipp Reisner kunmap(page); 14815cc287e0SAndreas Gruenbacher drbd_free_pages(mdev, page, 0); 1482fc5be839SAndreas Gruenbacher return err; 1483b411b363SPhilipp Reisner } 1484b411b363SPhilipp Reisner 1485b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1486b411b363SPhilipp Reisner sector_t sector, int data_size) 1487b411b363SPhilipp Reisner { 1488b411b363SPhilipp Reisner struct bio_vec *bvec; 1489b411b363SPhilipp Reisner struct bio *bio; 1490a5c31904SAndreas Gruenbacher int dgs, err, i, expect; 1491a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1492a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 1493b411b363SPhilipp Reisner 1494a0638456SPhilipp Reisner dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? 1495a0638456SPhilipp Reisner crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; 1496b411b363SPhilipp Reisner 1497b411b363SPhilipp Reisner if (dgs) { 1498a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1499a5c31904SAndreas Gruenbacher if (err) 1500a5c31904SAndreas Gruenbacher return err; 1501b411b363SPhilipp Reisner } 1502b411b363SPhilipp Reisner 1503b411b363SPhilipp Reisner data_size -= dgs; 1504b411b363SPhilipp Reisner 1505b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1506b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1507b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1508b411b363SPhilipp Reisner 1509b411b363SPhilipp Reisner bio = req->master_bio; 1510b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1511b411b363SPhilipp Reisner 1512b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1513a5c31904SAndreas Gruenbacher void *mapped = kmap(bvec->bv_page) + bvec->bv_offset; 1514b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1515a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, mapped, expect); 1516b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1517a5c31904SAndreas Gruenbacher if (err) 1518a5c31904SAndreas Gruenbacher return err; 1519a5c31904SAndreas Gruenbacher data_size -= expect; 1520b411b363SPhilipp Reisner } 1521b411b363SPhilipp Reisner 1522b411b363SPhilipp Reisner if (dgs) { 1523a0638456SPhilipp Reisner drbd_csum_bio(mdev, mdev->tconn->integrity_r_tfm, bio, dig_vv); 1524b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1525b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 152628284cefSAndreas Gruenbacher return -EINVAL; 1527b411b363SPhilipp Reisner } 1528b411b363SPhilipp Reisner } 1529b411b363SPhilipp Reisner 1530b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 153128284cefSAndreas Gruenbacher return 0; 1532b411b363SPhilipp Reisner } 1533b411b363SPhilipp Reisner 1534a990be46SAndreas Gruenbacher /* 1535a990be46SAndreas Gruenbacher * e_end_resync_block() is called in asender context via 1536a990be46SAndreas Gruenbacher * drbd_finish_peer_reqs(). 1537a990be46SAndreas Gruenbacher */ 153899920dc5SAndreas Gruenbacher static int e_end_resync_block(struct drbd_work *w, int unused) 1539b411b363SPhilipp Reisner { 15408050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 15418050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 154200d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1543db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 154499920dc5SAndreas Gruenbacher int err; 1545b411b363SPhilipp Reisner 1546db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1547b411b363SPhilipp Reisner 1548db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1549db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 155099920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); 1551b411b363SPhilipp Reisner } else { 1552b411b363SPhilipp Reisner /* Record failure to sync */ 1553db830c46SAndreas Gruenbacher drbd_rs_failed_io(mdev, sector, peer_req->i.size); 1554b411b363SPhilipp Reisner 155599920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1556b411b363SPhilipp Reisner } 1557b411b363SPhilipp Reisner dec_unacked(mdev); 1558b411b363SPhilipp Reisner 155999920dc5SAndreas Gruenbacher return err; 1560b411b363SPhilipp Reisner } 1561b411b363SPhilipp Reisner 1562b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1563b411b363SPhilipp Reisner { 1564db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1565b411b363SPhilipp Reisner 1566db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); 1567db830c46SAndreas Gruenbacher if (!peer_req) 156845bb912bSLars Ellenberg goto fail; 1569b411b363SPhilipp Reisner 1570b411b363SPhilipp Reisner dec_rs_pending(mdev); 1571b411b363SPhilipp Reisner 1572b411b363SPhilipp Reisner inc_unacked(mdev); 1573b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1574b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1575b411b363SPhilipp Reisner 1576db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_resync_block; 157745bb912bSLars Ellenberg 157887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1579db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->sync_ee); 158087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1581b411b363SPhilipp Reisner 15820f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 1583fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) 1584e1c1b0fcSAndreas Gruenbacher return 0; 158545bb912bSLars Ellenberg 158610f6d992SLars Ellenberg /* don't care for the reason here */ 158710f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 158887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1589db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 159087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 159122cc37a9SLars Ellenberg 15923967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 159345bb912bSLars Ellenberg fail: 159445bb912bSLars Ellenberg put_ldev(mdev); 1595e1c1b0fcSAndreas Gruenbacher return -EIO; 1596b411b363SPhilipp Reisner } 1597b411b363SPhilipp Reisner 1598668eebc6SAndreas Gruenbacher static struct drbd_request * 1599bc9c5c41SAndreas Gruenbacher find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, 1600bc9c5c41SAndreas Gruenbacher sector_t sector, bool missing_ok, const char *func) 1601668eebc6SAndreas Gruenbacher { 1602668eebc6SAndreas Gruenbacher struct drbd_request *req; 1603668eebc6SAndreas Gruenbacher 1604bc9c5c41SAndreas Gruenbacher /* Request object according to our peer */ 1605bc9c5c41SAndreas Gruenbacher req = (struct drbd_request *)(unsigned long)id; 16065e472264SAndreas Gruenbacher if (drbd_contains_interval(root, sector, &req->i) && req->i.local) 1607668eebc6SAndreas Gruenbacher return req; 1608c3afd8f5SAndreas Gruenbacher if (!missing_ok) { 1609c3afd8f5SAndreas Gruenbacher dev_err(DEV, "%s: failed to find request %lu, sector %llus\n", func, 1610c3afd8f5SAndreas Gruenbacher (unsigned long)id, (unsigned long long)sector); 1611c3afd8f5SAndreas Gruenbacher } 1612668eebc6SAndreas Gruenbacher return NULL; 1613668eebc6SAndreas Gruenbacher } 1614668eebc6SAndreas Gruenbacher 16154a76b161SAndreas Gruenbacher static int receive_DataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1616b411b363SPhilipp Reisner { 16174a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1618b411b363SPhilipp Reisner struct drbd_request *req; 1619b411b363SPhilipp Reisner sector_t sector; 162082bc0194SAndreas Gruenbacher int err; 1621e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 16224a76b161SAndreas Gruenbacher 16234a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 16244a76b161SAndreas Gruenbacher if (!mdev) 16254a76b161SAndreas Gruenbacher return -EIO; 1626b411b363SPhilipp Reisner 1627b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1628b411b363SPhilipp Reisner 162987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1630bc9c5c41SAndreas Gruenbacher req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); 163187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1632c3afd8f5SAndreas Gruenbacher if (unlikely(!req)) 163382bc0194SAndreas Gruenbacher return -EIO; 1634b411b363SPhilipp Reisner 163524c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1636b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1637b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1638e2857216SAndreas Gruenbacher err = recv_dless_read(mdev, req, sector, pi->size); 163982bc0194SAndreas Gruenbacher if (!err) 16408554df1cSAndreas Gruenbacher req_mod(req, DATA_RECEIVED); 1641b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1642b411b363SPhilipp Reisner * I don't think we may complete this just yet 1643b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1644b411b363SPhilipp Reisner 164582bc0194SAndreas Gruenbacher return err; 1646b411b363SPhilipp Reisner } 1647b411b363SPhilipp Reisner 16484a76b161SAndreas Gruenbacher static int receive_RSDataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1649b411b363SPhilipp Reisner { 16504a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1651b411b363SPhilipp Reisner sector_t sector; 165282bc0194SAndreas Gruenbacher int err; 1653e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 16544a76b161SAndreas Gruenbacher 16554a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 16564a76b161SAndreas Gruenbacher if (!mdev) 16574a76b161SAndreas Gruenbacher return -EIO; 1658b411b363SPhilipp Reisner 1659b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1660b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1661b411b363SPhilipp Reisner 1662b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1663b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1664b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1665fcefa62eSAndreas Gruenbacher * or in drbd_peer_request_endio. */ 1666e2857216SAndreas Gruenbacher err = recv_resync_read(mdev, sector, pi->size); 1667b411b363SPhilipp Reisner } else { 1668b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1669b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1670b411b363SPhilipp Reisner 1671e2857216SAndreas Gruenbacher err = drbd_drain_block(mdev, pi->size); 1672b411b363SPhilipp Reisner 1673e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 1674b411b363SPhilipp Reisner } 1675b411b363SPhilipp Reisner 1676e2857216SAndreas Gruenbacher atomic_add(pi->size >> 9, &mdev->rs_sect_in); 1677778f271dSPhilipp Reisner 167882bc0194SAndreas Gruenbacher return err; 1679b411b363SPhilipp Reisner } 1680b411b363SPhilipp Reisner 168199920dc5SAndreas Gruenbacher static int w_restart_write(struct drbd_work *w, int cancel) 16827be8da07SAndreas Gruenbacher { 16837be8da07SAndreas Gruenbacher struct drbd_request *req = container_of(w, struct drbd_request, w); 16847be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 16857be8da07SAndreas Gruenbacher struct bio *bio; 16867be8da07SAndreas Gruenbacher unsigned long start_time; 16877be8da07SAndreas Gruenbacher unsigned long flags; 16887be8da07SAndreas Gruenbacher 16897be8da07SAndreas Gruenbacher spin_lock_irqsave(&mdev->tconn->req_lock, flags); 16907be8da07SAndreas Gruenbacher if (!expect(req->rq_state & RQ_POSTPONED)) { 16917be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 169299920dc5SAndreas Gruenbacher return -EIO; 16937be8da07SAndreas Gruenbacher } 16947be8da07SAndreas Gruenbacher bio = req->master_bio; 16957be8da07SAndreas Gruenbacher start_time = req->start_time; 16967be8da07SAndreas Gruenbacher /* Postponed requests will not have their master_bio completed! */ 16977be8da07SAndreas Gruenbacher __req_mod(req, DISCARD_WRITE, NULL); 16987be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 16997be8da07SAndreas Gruenbacher 17007be8da07SAndreas Gruenbacher while (__drbd_make_request(mdev, bio, start_time)) 17017be8da07SAndreas Gruenbacher /* retry */ ; 170299920dc5SAndreas Gruenbacher return 0; 17037be8da07SAndreas Gruenbacher } 17047be8da07SAndreas Gruenbacher 17057be8da07SAndreas Gruenbacher static void restart_conflicting_writes(struct drbd_conf *mdev, 17067be8da07SAndreas Gruenbacher sector_t sector, int size) 17077be8da07SAndreas Gruenbacher { 17087be8da07SAndreas Gruenbacher struct drbd_interval *i; 17097be8da07SAndreas Gruenbacher struct drbd_request *req; 17107be8da07SAndreas Gruenbacher 17117be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 17127be8da07SAndreas Gruenbacher if (!i->local) 17137be8da07SAndreas Gruenbacher continue; 17147be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 17157be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 17167be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) 17177be8da07SAndreas Gruenbacher continue; 17187be8da07SAndreas Gruenbacher if (expect(list_empty(&req->w.list))) { 17197be8da07SAndreas Gruenbacher req->w.mdev = mdev; 17207be8da07SAndreas Gruenbacher req->w.cb = w_restart_write; 17217be8da07SAndreas Gruenbacher drbd_queue_work(&mdev->tconn->data.work, &req->w); 17227be8da07SAndreas Gruenbacher } 17237be8da07SAndreas Gruenbacher } 17247be8da07SAndreas Gruenbacher } 17257be8da07SAndreas Gruenbacher 1726a990be46SAndreas Gruenbacher /* 1727a990be46SAndreas Gruenbacher * e_end_block() is called in asender context via drbd_finish_peer_reqs(). 1728b411b363SPhilipp Reisner */ 172999920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *w, int cancel) 1730b411b363SPhilipp Reisner { 17318050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 17328050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 173300d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1734db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 173599920dc5SAndreas Gruenbacher int err = 0, pcmd; 1736b411b363SPhilipp Reisner 1737303d1448SPhilipp Reisner if (peer_req->flags & EE_SEND_WRITE_ACK) { 1738db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1739b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1740b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1741db830c46SAndreas Gruenbacher peer_req->flags & EE_MAY_SET_IN_SYNC) ? 1742b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 174399920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, pcmd, peer_req); 1744b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1745db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 1746b411b363SPhilipp Reisner } else { 174799920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1748b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1749b411b363SPhilipp Reisner * maybe assert this? */ 1750b411b363SPhilipp Reisner } 1751b411b363SPhilipp Reisner dec_unacked(mdev); 1752b411b363SPhilipp Reisner } 1753b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1754b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 175589e58e75SPhilipp Reisner if (mdev->tconn->net_conf->two_primaries) { 175687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1757db830c46SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&peer_req->i)); 1758db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 17597be8da07SAndreas Gruenbacher if (peer_req->flags & EE_RESTART_REQUESTS) 17607be8da07SAndreas Gruenbacher restart_conflicting_writes(mdev, sector, peer_req->i.size); 176187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1762bb3bfe96SAndreas Gruenbacher } else 1763db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1764b411b363SPhilipp Reisner 1765db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1766b411b363SPhilipp Reisner 176799920dc5SAndreas Gruenbacher return err; 1768b411b363SPhilipp Reisner } 1769b411b363SPhilipp Reisner 17707be8da07SAndreas Gruenbacher static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) 1771b411b363SPhilipp Reisner { 17727be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 17738050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 17748050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 177599920dc5SAndreas Gruenbacher int err; 1776b411b363SPhilipp Reisner 177799920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, ack, peer_req); 1778b411b363SPhilipp Reisner dec_unacked(mdev); 1779b411b363SPhilipp Reisner 178099920dc5SAndreas Gruenbacher return err; 1781b411b363SPhilipp Reisner } 1782b411b363SPhilipp Reisner 178399920dc5SAndreas Gruenbacher static int e_send_discard_write(struct drbd_work *w, int unused) 17847be8da07SAndreas Gruenbacher { 17857be8da07SAndreas Gruenbacher return e_send_ack(w, P_DISCARD_WRITE); 17867be8da07SAndreas Gruenbacher } 17877be8da07SAndreas Gruenbacher 178899920dc5SAndreas Gruenbacher static int e_send_retry_write(struct drbd_work *w, int unused) 17897be8da07SAndreas Gruenbacher { 17907be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = w->mdev->tconn; 17917be8da07SAndreas Gruenbacher 17927be8da07SAndreas Gruenbacher return e_send_ack(w, tconn->agreed_pro_version >= 100 ? 17937be8da07SAndreas Gruenbacher P_RETRY_WRITE : P_DISCARD_WRITE); 17947be8da07SAndreas Gruenbacher } 17957be8da07SAndreas Gruenbacher 17963e394da1SAndreas Gruenbacher static bool seq_greater(u32 a, u32 b) 17973e394da1SAndreas Gruenbacher { 17983e394da1SAndreas Gruenbacher /* 17993e394da1SAndreas Gruenbacher * We assume 32-bit wrap-around here. 18003e394da1SAndreas Gruenbacher * For 24-bit wrap-around, we would have to shift: 18013e394da1SAndreas Gruenbacher * a <<= 8; b <<= 8; 18023e394da1SAndreas Gruenbacher */ 18033e394da1SAndreas Gruenbacher return (s32)a - (s32)b > 0; 18043e394da1SAndreas Gruenbacher } 18053e394da1SAndreas Gruenbacher 18063e394da1SAndreas Gruenbacher static u32 seq_max(u32 a, u32 b) 18073e394da1SAndreas Gruenbacher { 18083e394da1SAndreas Gruenbacher return seq_greater(a, b) ? a : b; 18093e394da1SAndreas Gruenbacher } 18103e394da1SAndreas Gruenbacher 18117be8da07SAndreas Gruenbacher static bool need_peer_seq(struct drbd_conf *mdev) 18127be8da07SAndreas Gruenbacher { 18137be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 18147be8da07SAndreas Gruenbacher 18157be8da07SAndreas Gruenbacher /* 18167be8da07SAndreas Gruenbacher * We only need to keep track of the last packet_seq number of our peer 18177be8da07SAndreas Gruenbacher * if we are in dual-primary mode and we have the discard flag set; see 18187be8da07SAndreas Gruenbacher * handle_write_conflicts(). 18197be8da07SAndreas Gruenbacher */ 18207be8da07SAndreas Gruenbacher return tconn->net_conf->two_primaries && 18217be8da07SAndreas Gruenbacher test_bit(DISCARD_CONCURRENT, &tconn->flags); 18227be8da07SAndreas Gruenbacher } 18237be8da07SAndreas Gruenbacher 182443ae077dSAndreas Gruenbacher static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) 18253e394da1SAndreas Gruenbacher { 18263c13b680SLars Ellenberg unsigned int newest_peer_seq; 18273e394da1SAndreas Gruenbacher 18287be8da07SAndreas Gruenbacher if (need_peer_seq(mdev)) { 18293e394da1SAndreas Gruenbacher spin_lock(&mdev->peer_seq_lock); 18303c13b680SLars Ellenberg newest_peer_seq = seq_max(mdev->peer_seq, peer_seq); 18313c13b680SLars Ellenberg mdev->peer_seq = newest_peer_seq; 18323e394da1SAndreas Gruenbacher spin_unlock(&mdev->peer_seq_lock); 18333c13b680SLars Ellenberg /* wake up only if we actually changed mdev->peer_seq */ 18343c13b680SLars Ellenberg if (peer_seq == newest_peer_seq) 18353e394da1SAndreas Gruenbacher wake_up(&mdev->seq_wait); 18363e394da1SAndreas Gruenbacher } 18377be8da07SAndreas Gruenbacher } 18383e394da1SAndreas Gruenbacher 1839b411b363SPhilipp Reisner /* Called from receive_Data. 1840b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1841b411b363SPhilipp Reisner * 1842b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1843b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1844b411b363SPhilipp Reisner * been sent. 1845b411b363SPhilipp Reisner * 1846b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1847b411b363SPhilipp Reisner * 1848b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1849b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1850b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1851b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1852b411b363SPhilipp Reisner * 1853b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1854b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1855b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1856b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1857b411b363SPhilipp Reisner * 1858b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1859b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 18607be8da07SAndreas Gruenbacher static int wait_for_and_update_peer_seq(struct drbd_conf *mdev, const u32 peer_seq) 1861b411b363SPhilipp Reisner { 1862b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1863b411b363SPhilipp Reisner long timeout; 18647be8da07SAndreas Gruenbacher int ret; 18657be8da07SAndreas Gruenbacher 18667be8da07SAndreas Gruenbacher if (!need_peer_seq(mdev)) 18677be8da07SAndreas Gruenbacher return 0; 18687be8da07SAndreas Gruenbacher 1869b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1870b411b363SPhilipp Reisner for (;;) { 18717be8da07SAndreas Gruenbacher if (!seq_greater(peer_seq - 1, mdev->peer_seq)) { 18727be8da07SAndreas Gruenbacher mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); 18737be8da07SAndreas Gruenbacher ret = 0; 1874b411b363SPhilipp Reisner break; 18757be8da07SAndreas Gruenbacher } 1876b411b363SPhilipp Reisner if (signal_pending(current)) { 1877b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1878b411b363SPhilipp Reisner break; 1879b411b363SPhilipp Reisner } 18807be8da07SAndreas Gruenbacher prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1881b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 188244ed167dSPhilipp Reisner rcu_read_lock(); 188344ed167dSPhilipp Reisner timeout = rcu_dereference(mdev->tconn->net_conf)->ping_timeo*HZ/10; 188444ed167dSPhilipp Reisner rcu_read_unlock(); 188571b1c1ebSAndreas Gruenbacher timeout = schedule_timeout(timeout); 1886b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 18877be8da07SAndreas Gruenbacher if (!timeout) { 1888b411b363SPhilipp Reisner ret = -ETIMEDOUT; 188971b1c1ebSAndreas Gruenbacher dev_err(DEV, "Timed out waiting for missing ack packets; disconnecting\n"); 1890b411b363SPhilipp Reisner break; 1891b411b363SPhilipp Reisner } 1892b411b363SPhilipp Reisner } 1893b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 18947be8da07SAndreas Gruenbacher finish_wait(&mdev->seq_wait, &wait); 1895b411b363SPhilipp Reisner return ret; 1896b411b363SPhilipp Reisner } 1897b411b363SPhilipp Reisner 1898688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1899688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1900688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1901688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 190276d2e7ecSPhilipp Reisner { 190376d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 190476d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1905688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 190676d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 190776d2e7ecSPhilipp Reisner } 190876d2e7ecSPhilipp Reisner 19097be8da07SAndreas Gruenbacher static void fail_postponed_requests(struct drbd_conf *mdev, sector_t sector, 19107be8da07SAndreas Gruenbacher unsigned int size) 19117be8da07SAndreas Gruenbacher { 19127be8da07SAndreas Gruenbacher struct drbd_interval *i; 19137be8da07SAndreas Gruenbacher 19147be8da07SAndreas Gruenbacher repeat: 19157be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 19167be8da07SAndreas Gruenbacher struct drbd_request *req; 19177be8da07SAndreas Gruenbacher struct bio_and_error m; 19187be8da07SAndreas Gruenbacher 19197be8da07SAndreas Gruenbacher if (!i->local) 19207be8da07SAndreas Gruenbacher continue; 19217be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 19227be8da07SAndreas Gruenbacher if (!(req->rq_state & RQ_POSTPONED)) 19237be8da07SAndreas Gruenbacher continue; 19247be8da07SAndreas Gruenbacher req->rq_state &= ~RQ_POSTPONED; 19257be8da07SAndreas Gruenbacher __req_mod(req, NEG_ACKED, &m); 19267be8da07SAndreas Gruenbacher spin_unlock_irq(&mdev->tconn->req_lock); 19277be8da07SAndreas Gruenbacher if (m.bio) 19287be8da07SAndreas Gruenbacher complete_master_bio(mdev, &m); 19297be8da07SAndreas Gruenbacher spin_lock_irq(&mdev->tconn->req_lock); 19307be8da07SAndreas Gruenbacher goto repeat; 19317be8da07SAndreas Gruenbacher } 19327be8da07SAndreas Gruenbacher } 19337be8da07SAndreas Gruenbacher 19347be8da07SAndreas Gruenbacher static int handle_write_conflicts(struct drbd_conf *mdev, 19357be8da07SAndreas Gruenbacher struct drbd_peer_request *peer_req) 19367be8da07SAndreas Gruenbacher { 19377be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 19387be8da07SAndreas Gruenbacher bool resolve_conflicts = test_bit(DISCARD_CONCURRENT, &tconn->flags); 19397be8da07SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 19407be8da07SAndreas Gruenbacher const unsigned int size = peer_req->i.size; 19417be8da07SAndreas Gruenbacher struct drbd_interval *i; 19427be8da07SAndreas Gruenbacher bool equal; 19437be8da07SAndreas Gruenbacher int err; 19447be8da07SAndreas Gruenbacher 19457be8da07SAndreas Gruenbacher /* 19467be8da07SAndreas Gruenbacher * Inserting the peer request into the write_requests tree will prevent 19477be8da07SAndreas Gruenbacher * new conflicting local requests from being added. 19487be8da07SAndreas Gruenbacher */ 19497be8da07SAndreas Gruenbacher drbd_insert_interval(&mdev->write_requests, &peer_req->i); 19507be8da07SAndreas Gruenbacher 19517be8da07SAndreas Gruenbacher repeat: 19527be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 19537be8da07SAndreas Gruenbacher if (i == &peer_req->i) 19547be8da07SAndreas Gruenbacher continue; 19557be8da07SAndreas Gruenbacher 19567be8da07SAndreas Gruenbacher if (!i->local) { 19577be8da07SAndreas Gruenbacher /* 19587be8da07SAndreas Gruenbacher * Our peer has sent a conflicting remote request; this 19597be8da07SAndreas Gruenbacher * should not happen in a two-node setup. Wait for the 19607be8da07SAndreas Gruenbacher * earlier peer request to complete. 19617be8da07SAndreas Gruenbacher */ 19627be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, i); 19637be8da07SAndreas Gruenbacher if (err) 19647be8da07SAndreas Gruenbacher goto out; 19657be8da07SAndreas Gruenbacher goto repeat; 19667be8da07SAndreas Gruenbacher } 19677be8da07SAndreas Gruenbacher 19687be8da07SAndreas Gruenbacher equal = i->sector == sector && i->size == size; 19697be8da07SAndreas Gruenbacher if (resolve_conflicts) { 19707be8da07SAndreas Gruenbacher /* 19717be8da07SAndreas Gruenbacher * If the peer request is fully contained within the 19727be8da07SAndreas Gruenbacher * overlapping request, it can be discarded; otherwise, 19737be8da07SAndreas Gruenbacher * it will be retried once all overlapping requests 19747be8da07SAndreas Gruenbacher * have completed. 19757be8da07SAndreas Gruenbacher */ 19767be8da07SAndreas Gruenbacher bool discard = i->sector <= sector && i->sector + 19777be8da07SAndreas Gruenbacher (i->size >> 9) >= sector + (size >> 9); 19787be8da07SAndreas Gruenbacher 19797be8da07SAndreas Gruenbacher if (!equal) 19807be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 19817be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u, " 19827be8da07SAndreas Gruenbacher "assuming %s came first\n", 19837be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 19847be8da07SAndreas Gruenbacher (unsigned long long)sector, size, 19857be8da07SAndreas Gruenbacher discard ? "local" : "remote"); 19867be8da07SAndreas Gruenbacher 19877be8da07SAndreas Gruenbacher inc_unacked(mdev); 19887be8da07SAndreas Gruenbacher peer_req->w.cb = discard ? e_send_discard_write : 19897be8da07SAndreas Gruenbacher e_send_retry_write; 19907be8da07SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->done_ee); 19917be8da07SAndreas Gruenbacher wake_asender(mdev->tconn); 19927be8da07SAndreas Gruenbacher 19937be8da07SAndreas Gruenbacher err = -ENOENT; 19947be8da07SAndreas Gruenbacher goto out; 19957be8da07SAndreas Gruenbacher } else { 19967be8da07SAndreas Gruenbacher struct drbd_request *req = 19977be8da07SAndreas Gruenbacher container_of(i, struct drbd_request, i); 19987be8da07SAndreas Gruenbacher 19997be8da07SAndreas Gruenbacher if (!equal) 20007be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 20017be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u\n", 20027be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 20037be8da07SAndreas Gruenbacher (unsigned long long)sector, size); 20047be8da07SAndreas Gruenbacher 20057be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 20067be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) { 20077be8da07SAndreas Gruenbacher /* 20087be8da07SAndreas Gruenbacher * Wait for the node with the discard flag to 20097be8da07SAndreas Gruenbacher * decide if this request will be discarded or 20107be8da07SAndreas Gruenbacher * retried. Requests that are discarded will 20117be8da07SAndreas Gruenbacher * disappear from the write_requests tree. 20127be8da07SAndreas Gruenbacher * 20137be8da07SAndreas Gruenbacher * In addition, wait for the conflicting 20147be8da07SAndreas Gruenbacher * request to finish locally before submitting 20157be8da07SAndreas Gruenbacher * the conflicting peer request. 20167be8da07SAndreas Gruenbacher */ 20177be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, &req->i); 20187be8da07SAndreas Gruenbacher if (err) { 20197be8da07SAndreas Gruenbacher _conn_request_state(mdev->tconn, 20207be8da07SAndreas Gruenbacher NS(conn, C_TIMEOUT), 20217be8da07SAndreas Gruenbacher CS_HARD); 20227be8da07SAndreas Gruenbacher fail_postponed_requests(mdev, sector, size); 20237be8da07SAndreas Gruenbacher goto out; 20247be8da07SAndreas Gruenbacher } 20257be8da07SAndreas Gruenbacher goto repeat; 20267be8da07SAndreas Gruenbacher } 20277be8da07SAndreas Gruenbacher /* 20287be8da07SAndreas Gruenbacher * Remember to restart the conflicting requests after 20297be8da07SAndreas Gruenbacher * the new peer request has completed. 20307be8da07SAndreas Gruenbacher */ 20317be8da07SAndreas Gruenbacher peer_req->flags |= EE_RESTART_REQUESTS; 20327be8da07SAndreas Gruenbacher } 20337be8da07SAndreas Gruenbacher } 20347be8da07SAndreas Gruenbacher err = 0; 20357be8da07SAndreas Gruenbacher 20367be8da07SAndreas Gruenbacher out: 20377be8da07SAndreas Gruenbacher if (err) 20387be8da07SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 20397be8da07SAndreas Gruenbacher return err; 20407be8da07SAndreas Gruenbacher } 20417be8da07SAndreas Gruenbacher 2042b411b363SPhilipp Reisner /* mirrored write */ 20434a76b161SAndreas Gruenbacher static int receive_Data(struct drbd_tconn *tconn, struct packet_info *pi) 2044b411b363SPhilipp Reisner { 20454a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2046b411b363SPhilipp Reisner sector_t sector; 2047db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2048e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 20497be8da07SAndreas Gruenbacher u32 peer_seq = be32_to_cpu(p->seq_num); 2050b411b363SPhilipp Reisner int rw = WRITE; 2051b411b363SPhilipp Reisner u32 dp_flags; 20527be8da07SAndreas Gruenbacher int err; 20537be8da07SAndreas Gruenbacher 20544a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 20554a76b161SAndreas Gruenbacher if (!mdev) 20564a76b161SAndreas Gruenbacher return -EIO; 20574a76b161SAndreas Gruenbacher 2058b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 205982bc0194SAndreas Gruenbacher int err2; 206082bc0194SAndreas Gruenbacher 20617be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 2062e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 2063b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 2064e2857216SAndreas Gruenbacher err2 = drbd_drain_block(mdev, pi->size); 206582bc0194SAndreas Gruenbacher if (!err) 206682bc0194SAndreas Gruenbacher err = err2; 206782bc0194SAndreas Gruenbacher return err; 2068b411b363SPhilipp Reisner } 2069b411b363SPhilipp Reisner 2070fcefa62eSAndreas Gruenbacher /* 2071fcefa62eSAndreas Gruenbacher * Corresponding put_ldev done either below (on various errors), or in 2072fcefa62eSAndreas Gruenbacher * drbd_peer_request_endio, if we successfully submit the data at the 2073fcefa62eSAndreas Gruenbacher * end of this function. 2074fcefa62eSAndreas Gruenbacher */ 2075b411b363SPhilipp Reisner 2076b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2077e2857216SAndreas Gruenbacher peer_req = read_in_block(mdev, p->block_id, sector, pi->size); 2078db830c46SAndreas Gruenbacher if (!peer_req) { 2079b411b363SPhilipp Reisner put_ldev(mdev); 208082bc0194SAndreas Gruenbacher return -EIO; 2081b411b363SPhilipp Reisner } 2082b411b363SPhilipp Reisner 2083db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_block; 2084b411b363SPhilipp Reisner 2085688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 2086688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 2087688593c5SLars Ellenberg 2088688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 2089db830c46SAndreas Gruenbacher peer_req->flags |= EE_MAY_SET_IN_SYNC; 2090688593c5SLars Ellenberg 2091b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 2092db830c46SAndreas Gruenbacher peer_req->epoch = mdev->current_epoch; 2093db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->epoch_size); 2094db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->active); 2095b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 2096b411b363SPhilipp Reisner 20977be8da07SAndreas Gruenbacher if (mdev->tconn->net_conf->two_primaries) { 20987be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 20997be8da07SAndreas Gruenbacher if (err) 2100b411b363SPhilipp Reisner goto out_interrupted; 210187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 21027be8da07SAndreas Gruenbacher err = handle_write_conflicts(mdev, peer_req); 21037be8da07SAndreas Gruenbacher if (err) { 210487eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 21057be8da07SAndreas Gruenbacher if (err == -ENOENT) { 2106b411b363SPhilipp Reisner put_ldev(mdev); 210782bc0194SAndreas Gruenbacher return 0; 2108b411b363SPhilipp Reisner } 2109b411b363SPhilipp Reisner goto out_interrupted; 2110b411b363SPhilipp Reisner } 21117be8da07SAndreas Gruenbacher } else 211287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2113db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->active_ee); 211487eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2115b411b363SPhilipp Reisner 2116303d1448SPhilipp Reisner if (mdev->tconn->agreed_pro_version < 100) { 211744ed167dSPhilipp Reisner rcu_read_lock(); 211844ed167dSPhilipp Reisner switch (rcu_dereference(mdev->tconn->net_conf)->wire_protocol) { 2119b411b363SPhilipp Reisner case DRBD_PROT_C: 2120303d1448SPhilipp Reisner dp_flags |= DP_SEND_WRITE_ACK; 2121303d1448SPhilipp Reisner break; 2122303d1448SPhilipp Reisner case DRBD_PROT_B: 2123303d1448SPhilipp Reisner dp_flags |= DP_SEND_RECEIVE_ACK; 2124303d1448SPhilipp Reisner break; 2125303d1448SPhilipp Reisner } 212644ed167dSPhilipp Reisner rcu_read_unlock(); 2127303d1448SPhilipp Reisner } 2128303d1448SPhilipp Reisner 2129303d1448SPhilipp Reisner if (dp_flags & DP_SEND_WRITE_ACK) { 2130303d1448SPhilipp Reisner peer_req->flags |= EE_SEND_WRITE_ACK; 2131b411b363SPhilipp Reisner inc_unacked(mdev); 2132b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 2133b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 2134303d1448SPhilipp Reisner } 2135303d1448SPhilipp Reisner 2136303d1448SPhilipp Reisner if (dp_flags & DP_SEND_RECEIVE_ACK) { 2137b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 2138b411b363SPhilipp Reisner * sends on the msock, but anyways */ 2139db830c46SAndreas Gruenbacher drbd_send_ack(mdev, P_RECV_ACK, peer_req); 2140b411b363SPhilipp Reisner } 2141b411b363SPhilipp Reisner 21426719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 2143b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 2144db830c46SAndreas Gruenbacher drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); 2145db830c46SAndreas Gruenbacher peer_req->flags |= EE_CALL_AL_COMPLETE_IO; 2146db830c46SAndreas Gruenbacher peer_req->flags &= ~EE_MAY_SET_IN_SYNC; 2147181286adSLars Ellenberg drbd_al_begin_io(mdev, &peer_req->i); 2148b411b363SPhilipp Reisner } 2149b411b363SPhilipp Reisner 215082bc0194SAndreas Gruenbacher err = drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR); 215182bc0194SAndreas Gruenbacher if (!err) 215282bc0194SAndreas Gruenbacher return 0; 2153b411b363SPhilipp Reisner 215410f6d992SLars Ellenberg /* don't care for the reason here */ 215510f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 215687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2157db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 2158db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 215987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2160db830c46SAndreas Gruenbacher if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) 2161181286adSLars Ellenberg drbd_al_complete_io(mdev, &peer_req->i); 216222cc37a9SLars Ellenberg 2163b411b363SPhilipp Reisner out_interrupted: 2164db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + EV_CLEANUP); 2165b411b363SPhilipp Reisner put_ldev(mdev); 21663967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 216782bc0194SAndreas Gruenbacher return err; 2168b411b363SPhilipp Reisner } 2169b411b363SPhilipp Reisner 21700f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 21710f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 21720f0601f4SLars Ellenberg * 21730f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 21740f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 21750f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 21760f0601f4SLars Ellenberg * activity, it obviously is "busy". 21770f0601f4SLars Ellenberg * 21780f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 21790f0601f4SLars Ellenberg * to have a short time average so we can react faster. 21800f0601f4SLars Ellenberg */ 2181e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 21820f0601f4SLars Ellenberg { 21830f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 21840f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 2185e3555d85SPhilipp Reisner struct lc_element *tmp; 21860f0601f4SLars Ellenberg int curr_events; 21870f0601f4SLars Ellenberg int throttle = 0; 21880f0601f4SLars Ellenberg 21890f0601f4SLars Ellenberg /* feature disabled? */ 2190f399002eSLars Ellenberg if (mdev->ldev->dc.c_min_rate == 0) 21910f0601f4SLars Ellenberg return 0; 21920f0601f4SLars Ellenberg 2193e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 2194e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 2195e3555d85SPhilipp Reisner if (tmp) { 2196e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 2197e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 2198e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2199e3555d85SPhilipp Reisner return 0; 2200e3555d85SPhilipp Reisner } 2201e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 2202e3555d85SPhilipp Reisner } 2203e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2204e3555d85SPhilipp Reisner 22050f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 22060f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 22070f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 2208e3555d85SPhilipp Reisner 22090f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 22100f0601f4SLars Ellenberg unsigned long rs_left; 22110f0601f4SLars Ellenberg int i; 22120f0601f4SLars Ellenberg 22130f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 22140f0601f4SLars Ellenberg 22150f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 22160f0601f4SLars Ellenberg * approx. */ 22172649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 22182649f080SLars Ellenberg 22192649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 22202649f080SLars Ellenberg rs_left = mdev->ov_left; 22212649f080SLars Ellenberg else 22220f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 22230f0601f4SLars Ellenberg 22240f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 22250f0601f4SLars Ellenberg if (!dt) 22260f0601f4SLars Ellenberg dt++; 22270f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 22280f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 22290f0601f4SLars Ellenberg 2230f399002eSLars Ellenberg if (dbdt > mdev->ldev->dc.c_min_rate) 22310f0601f4SLars Ellenberg throttle = 1; 22320f0601f4SLars Ellenberg } 22330f0601f4SLars Ellenberg return throttle; 22340f0601f4SLars Ellenberg } 22350f0601f4SLars Ellenberg 22360f0601f4SLars Ellenberg 22374a76b161SAndreas Gruenbacher static int receive_DataRequest(struct drbd_tconn *tconn, struct packet_info *pi) 2238b411b363SPhilipp Reisner { 22394a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2240b411b363SPhilipp Reisner sector_t sector; 22414a76b161SAndreas Gruenbacher sector_t capacity; 2242db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2243b411b363SPhilipp Reisner struct digest_info *di = NULL; 2244b18b37beSPhilipp Reisner int size, verb; 2245b411b363SPhilipp Reisner unsigned int fault_type; 2246e658983aSAndreas Gruenbacher struct p_block_req *p = pi->data; 22474a76b161SAndreas Gruenbacher 22484a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 22494a76b161SAndreas Gruenbacher if (!mdev) 22504a76b161SAndreas Gruenbacher return -EIO; 22514a76b161SAndreas Gruenbacher capacity = drbd_get_capacity(mdev->this_bdev); 2252b411b363SPhilipp Reisner 2253b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2254b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2255b411b363SPhilipp Reisner 2256c670a398SAndreas Gruenbacher if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { 2257b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2258b411b363SPhilipp Reisner (unsigned long long)sector, size); 225982bc0194SAndreas Gruenbacher return -EINVAL; 2260b411b363SPhilipp Reisner } 2261b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 2262b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2263b411b363SPhilipp Reisner (unsigned long long)sector, size); 226482bc0194SAndreas Gruenbacher return -EINVAL; 2265b411b363SPhilipp Reisner } 2266b411b363SPhilipp Reisner 2267b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 2268b18b37beSPhilipp Reisner verb = 1; 2269e2857216SAndreas Gruenbacher switch (pi->cmd) { 2270b18b37beSPhilipp Reisner case P_DATA_REQUEST: 2271b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 2272b18b37beSPhilipp Reisner break; 2273b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2274b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2275b18b37beSPhilipp Reisner case P_OV_REQUEST: 2276b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 2277b18b37beSPhilipp Reisner break; 2278b18b37beSPhilipp Reisner case P_OV_REPLY: 2279b18b37beSPhilipp Reisner verb = 0; 2280b18b37beSPhilipp Reisner dec_rs_pending(mdev); 2281b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 2282b18b37beSPhilipp Reisner break; 2283b18b37beSPhilipp Reisner default: 228449ba9b1bSAndreas Gruenbacher BUG(); 2285b18b37beSPhilipp Reisner } 2286b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2287b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2288b411b363SPhilipp Reisner "no local data.\n"); 2289b18b37beSPhilipp Reisner 2290a821cc4aSLars Ellenberg /* drain possibly payload */ 2291e2857216SAndreas Gruenbacher return drbd_drain_block(mdev, pi->size); 2292b411b363SPhilipp Reisner } 2293b411b363SPhilipp Reisner 2294b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2295b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2296b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 22970db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, p->block_id, sector, size, GFP_NOIO); 2298db830c46SAndreas Gruenbacher if (!peer_req) { 2299b411b363SPhilipp Reisner put_ldev(mdev); 230082bc0194SAndreas Gruenbacher return -ENOMEM; 2301b411b363SPhilipp Reisner } 2302b411b363SPhilipp Reisner 2303e2857216SAndreas Gruenbacher switch (pi->cmd) { 2304b411b363SPhilipp Reisner case P_DATA_REQUEST: 2305db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_data_req; 2306b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 230780a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 230880a40e43SLars Ellenberg goto submit; 230980a40e43SLars Ellenberg 2310b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2311db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_rsdata_req; 2312b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 23135f9915bbSLars Ellenberg /* used in the sector offset progress display */ 23145f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2315b411b363SPhilipp Reisner break; 2316b411b363SPhilipp Reisner 2317b411b363SPhilipp Reisner case P_OV_REPLY: 2318b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2319b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2320e2857216SAndreas Gruenbacher di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); 2321b411b363SPhilipp Reisner if (!di) 2322b411b363SPhilipp Reisner goto out_free_e; 2323b411b363SPhilipp Reisner 2324e2857216SAndreas Gruenbacher di->digest_size = pi->size; 2325b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2326b411b363SPhilipp Reisner 2327db830c46SAndreas Gruenbacher peer_req->digest = di; 2328db830c46SAndreas Gruenbacher peer_req->flags |= EE_HAS_DIGEST; 2329c36c3cedSLars Ellenberg 2330e2857216SAndreas Gruenbacher if (drbd_recv_all(mdev->tconn, di->digest, pi->size)) 2331b411b363SPhilipp Reisner goto out_free_e; 2332b411b363SPhilipp Reisner 2333e2857216SAndreas Gruenbacher if (pi->cmd == P_CSUM_RS_REQUEST) { 233431890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 2335db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_csum_rs_req; 23365f9915bbSLars Ellenberg /* used in the sector offset progress display */ 23375f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2338e2857216SAndreas Gruenbacher } else if (pi->cmd == P_OV_REPLY) { 23392649f080SLars Ellenberg /* track progress, we may need to throttle */ 23402649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2341db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_reply; 2342b411b363SPhilipp Reisner dec_rs_pending(mdev); 23430f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 23440f0601f4SLars Ellenberg * but accounting still needs to be done. */ 23450f0601f4SLars Ellenberg goto submit_for_resync; 2346b411b363SPhilipp Reisner } 2347b411b363SPhilipp Reisner break; 2348b411b363SPhilipp Reisner 2349b411b363SPhilipp Reisner case P_OV_REQUEST: 2350b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 235131890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90) { 2352de228bbaSLars Ellenberg unsigned long now = jiffies; 2353de228bbaSLars Ellenberg int i; 2354b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2355b411b363SPhilipp Reisner mdev->ov_position = sector; 235630b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 235730b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2358de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2359de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2360de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2361de228bbaSLars Ellenberg } 2362b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2363b411b363SPhilipp Reisner (unsigned long long)sector); 2364b411b363SPhilipp Reisner } 2365db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_req; 2366b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2367b411b363SPhilipp Reisner break; 2368b411b363SPhilipp Reisner 2369b411b363SPhilipp Reisner default: 237049ba9b1bSAndreas Gruenbacher BUG(); 2371b411b363SPhilipp Reisner } 2372b411b363SPhilipp Reisner 23730f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 23740f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 23750f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 23760f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 23770f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 23780f0601f4SLars Ellenberg * 23790f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 23800f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 23810f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 23820f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 23830f0601f4SLars Ellenberg * a while, anyways. 23840f0601f4SLars Ellenberg */ 2385b411b363SPhilipp Reisner 23860f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 23870f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 23880f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 23890f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 23900f0601f4SLars Ellenberg * 23910f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 23920f0601f4SLars Ellenberg * we would also throttle its application reads. 23930f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 23940f0601f4SLars Ellenberg */ 2395e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2396e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2397e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 239880a40e43SLars Ellenberg goto out_free_e; 2399b411b363SPhilipp Reisner 24000f0601f4SLars Ellenberg submit_for_resync: 24010f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 24020f0601f4SLars Ellenberg 240380a40e43SLars Ellenberg submit: 2404b411b363SPhilipp Reisner inc_unacked(mdev); 240587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2406db830c46SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->read_ee); 240787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2408b411b363SPhilipp Reisner 2409fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0) 241082bc0194SAndreas Gruenbacher return 0; 2411b411b363SPhilipp Reisner 241210f6d992SLars Ellenberg /* don't care for the reason here */ 241310f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 241487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2415db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 241687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 241722cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 241822cc37a9SLars Ellenberg 2419b411b363SPhilipp Reisner out_free_e: 2420b411b363SPhilipp Reisner put_ldev(mdev); 24213967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 242282bc0194SAndreas Gruenbacher return -EIO; 2423b411b363SPhilipp Reisner } 2424b411b363SPhilipp Reisner 2425b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2426b411b363SPhilipp Reisner { 2427b411b363SPhilipp Reisner int self, peer, rv = -100; 2428b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 242944ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_0p; 2430b411b363SPhilipp Reisner 2431b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2432b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2433b411b363SPhilipp Reisner 2434b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2435b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2436b411b363SPhilipp Reisner 243744ed167dSPhilipp Reisner rcu_read_lock(); 243844ed167dSPhilipp Reisner after_sb_0p = rcu_dereference(mdev->tconn->net_conf)->after_sb_0p; 243944ed167dSPhilipp Reisner rcu_read_unlock(); 244044ed167dSPhilipp Reisner switch (after_sb_0p) { 2441b411b363SPhilipp Reisner case ASB_CONSENSUS: 2442b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2443b411b363SPhilipp Reisner case ASB_CALL_HELPER: 244444ed167dSPhilipp Reisner case ASB_VIOLENTLY: 2445b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2446b411b363SPhilipp Reisner break; 2447b411b363SPhilipp Reisner case ASB_DISCONNECT: 2448b411b363SPhilipp Reisner break; 2449b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2450b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2451b411b363SPhilipp Reisner rv = -1; 2452b411b363SPhilipp Reisner break; 2453b411b363SPhilipp Reisner } 2454b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2455b411b363SPhilipp Reisner rv = 1; 2456b411b363SPhilipp Reisner break; 2457b411b363SPhilipp Reisner } 2458b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2459b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2460b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2461b411b363SPhilipp Reisner rv = 1; 2462b411b363SPhilipp Reisner break; 2463b411b363SPhilipp Reisner } 2464b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2465b411b363SPhilipp Reisner rv = -1; 2466b411b363SPhilipp Reisner break; 2467b411b363SPhilipp Reisner } 2468b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2469ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2470b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2471b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2472b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 247325703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2474b411b363SPhilipp Reisner ? -1 : 1; 2475b411b363SPhilipp Reisner break; 2476b411b363SPhilipp Reisner } else { 2477b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2478b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2479b411b363SPhilipp Reisner } 248044ed167dSPhilipp Reisner if (after_sb_0p == ASB_DISCARD_ZERO_CHG) 2481b411b363SPhilipp Reisner break; 2482b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2483b411b363SPhilipp Reisner if (ch_self < ch_peer) 2484b411b363SPhilipp Reisner rv = -1; 2485b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2486b411b363SPhilipp Reisner rv = 1; 2487b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2488b411b363SPhilipp Reisner /* Well, then use something else. */ 248925703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2490b411b363SPhilipp Reisner ? -1 : 1; 2491b411b363SPhilipp Reisner break; 2492b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2493b411b363SPhilipp Reisner rv = -1; 2494b411b363SPhilipp Reisner break; 2495b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2496b411b363SPhilipp Reisner rv = 1; 2497b411b363SPhilipp Reisner } 2498b411b363SPhilipp Reisner 2499b411b363SPhilipp Reisner return rv; 2500b411b363SPhilipp Reisner } 2501b411b363SPhilipp Reisner 2502b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2503b411b363SPhilipp Reisner { 25046184ea21SAndreas Gruenbacher int hg, rv = -100; 250544ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_1p; 2506b411b363SPhilipp Reisner 250744ed167dSPhilipp Reisner rcu_read_lock(); 250844ed167dSPhilipp Reisner after_sb_1p = rcu_dereference(mdev->tconn->net_conf)->after_sb_1p; 250944ed167dSPhilipp Reisner rcu_read_unlock(); 251044ed167dSPhilipp Reisner switch (after_sb_1p) { 2511b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2512b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2513b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2514b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2515b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 251644ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2517b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2518b411b363SPhilipp Reisner break; 2519b411b363SPhilipp Reisner case ASB_DISCONNECT: 2520b411b363SPhilipp Reisner break; 2521b411b363SPhilipp Reisner case ASB_CONSENSUS: 2522b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2523b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2524b411b363SPhilipp Reisner rv = hg; 2525b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2526b411b363SPhilipp Reisner rv = hg; 2527b411b363SPhilipp Reisner break; 2528b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2529b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2530b411b363SPhilipp Reisner break; 2531b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2532b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2533b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2534b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2535b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2536bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2537bb437946SAndreas Gruenbacher 2538bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2539b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2540b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2541b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2542bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2543bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2544b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2545b411b363SPhilipp Reisner } else { 2546b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2547b411b363SPhilipp Reisner rv = hg; 2548b411b363SPhilipp Reisner } 2549b411b363SPhilipp Reisner } else 2550b411b363SPhilipp Reisner rv = hg; 2551b411b363SPhilipp Reisner } 2552b411b363SPhilipp Reisner 2553b411b363SPhilipp Reisner return rv; 2554b411b363SPhilipp Reisner } 2555b411b363SPhilipp Reisner 2556b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2557b411b363SPhilipp Reisner { 25586184ea21SAndreas Gruenbacher int hg, rv = -100; 255944ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_2p; 2560b411b363SPhilipp Reisner 256144ed167dSPhilipp Reisner rcu_read_lock(); 256244ed167dSPhilipp Reisner after_sb_2p = rcu_dereference(mdev->tconn->net_conf)->after_sb_2p; 256344ed167dSPhilipp Reisner rcu_read_unlock(); 256444ed167dSPhilipp Reisner switch (after_sb_2p) { 2565b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2566b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2567b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2568b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2569b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2570b411b363SPhilipp Reisner case ASB_CONSENSUS: 2571b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 257244ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2573b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2574b411b363SPhilipp Reisner break; 2575b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2576b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2577b411b363SPhilipp Reisner break; 2578b411b363SPhilipp Reisner case ASB_DISCONNECT: 2579b411b363SPhilipp Reisner break; 2580b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2581b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2582b411b363SPhilipp Reisner if (hg == -1) { 2583bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2584bb437946SAndreas Gruenbacher 2585b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2586b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2587b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2588bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2589bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2590b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2591b411b363SPhilipp Reisner } else { 2592b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2593b411b363SPhilipp Reisner rv = hg; 2594b411b363SPhilipp Reisner } 2595b411b363SPhilipp Reisner } else 2596b411b363SPhilipp Reisner rv = hg; 2597b411b363SPhilipp Reisner } 2598b411b363SPhilipp Reisner 2599b411b363SPhilipp Reisner return rv; 2600b411b363SPhilipp Reisner } 2601b411b363SPhilipp Reisner 2602b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2603b411b363SPhilipp Reisner u64 bits, u64 flags) 2604b411b363SPhilipp Reisner { 2605b411b363SPhilipp Reisner if (!uuid) { 2606b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2607b411b363SPhilipp Reisner return; 2608b411b363SPhilipp Reisner } 2609b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2610b411b363SPhilipp Reisner text, 2611b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2612b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2613b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2614b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2615b411b363SPhilipp Reisner (unsigned long long)bits, 2616b411b363SPhilipp Reisner (unsigned long long)flags); 2617b411b363SPhilipp Reisner } 2618b411b363SPhilipp Reisner 2619b411b363SPhilipp Reisner /* 2620b411b363SPhilipp Reisner 100 after split brain try auto recover 2621b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2622b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2623b411b363SPhilipp Reisner 0 no Sync 2624b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2625b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2626b411b363SPhilipp Reisner -100 after split brain, disconnect 2627b411b363SPhilipp Reisner -1000 unrelated data 26284a23f264SPhilipp Reisner -1091 requires proto 91 26294a23f264SPhilipp Reisner -1096 requires proto 96 2630b411b363SPhilipp Reisner */ 2631b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2632b411b363SPhilipp Reisner { 2633b411b363SPhilipp Reisner u64 self, peer; 2634b411b363SPhilipp Reisner int i, j; 2635b411b363SPhilipp Reisner 2636b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2637b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2638b411b363SPhilipp Reisner 2639b411b363SPhilipp Reisner *rule_nr = 10; 2640b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2641b411b363SPhilipp Reisner return 0; 2642b411b363SPhilipp Reisner 2643b411b363SPhilipp Reisner *rule_nr = 20; 2644b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2645b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2646b411b363SPhilipp Reisner return -2; 2647b411b363SPhilipp Reisner 2648b411b363SPhilipp Reisner *rule_nr = 30; 2649b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2650b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2651b411b363SPhilipp Reisner return 2; 2652b411b363SPhilipp Reisner 2653b411b363SPhilipp Reisner if (self == peer) { 2654b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2655b411b363SPhilipp Reisner 2656b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2657b411b363SPhilipp Reisner 265831890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 26594a23f264SPhilipp Reisner return -1091; 2660b411b363SPhilipp Reisner 2661b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2662b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2663b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2664b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2665b411b363SPhilipp Reisner 2666b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2667b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2668b411b363SPhilipp Reisner *rule_nr = 34; 2669b411b363SPhilipp Reisner } else { 2670b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2671b411b363SPhilipp Reisner *rule_nr = 36; 2672b411b363SPhilipp Reisner } 2673b411b363SPhilipp Reisner 2674b411b363SPhilipp Reisner return 1; 2675b411b363SPhilipp Reisner } 2676b411b363SPhilipp Reisner 2677b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2678b411b363SPhilipp Reisner 267931890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 26804a23f264SPhilipp Reisner return -1091; 2681b411b363SPhilipp Reisner 2682b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2683b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2684b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2685b411b363SPhilipp Reisner 2686b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2687b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2688b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2689b411b363SPhilipp Reisner 2690b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2691b411b363SPhilipp Reisner *rule_nr = 35; 2692b411b363SPhilipp Reisner } else { 2693b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2694b411b363SPhilipp Reisner *rule_nr = 37; 2695b411b363SPhilipp Reisner } 2696b411b363SPhilipp Reisner 2697b411b363SPhilipp Reisner return -1; 2698b411b363SPhilipp Reisner } 2699b411b363SPhilipp Reisner 2700b411b363SPhilipp Reisner /* Common power [off|failure] */ 2701b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2702b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2703b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2704b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2705b411b363SPhilipp Reisner *rule_nr = 40; 2706b411b363SPhilipp Reisner 2707b411b363SPhilipp Reisner switch (rct) { 2708b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2709b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2710b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2711b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 271225703f83SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 2713b411b363SPhilipp Reisner return dc ? -1 : 1; 2714b411b363SPhilipp Reisner } 2715b411b363SPhilipp Reisner } 2716b411b363SPhilipp Reisner 2717b411b363SPhilipp Reisner *rule_nr = 50; 2718b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2719b411b363SPhilipp Reisner if (self == peer) 2720b411b363SPhilipp Reisner return -1; 2721b411b363SPhilipp Reisner 2722b411b363SPhilipp Reisner *rule_nr = 51; 2723b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2724b411b363SPhilipp Reisner if (self == peer) { 272531890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 27264a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 27274a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 27284a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2729b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2730b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2731b411b363SPhilipp Reisner 273231890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27334a23f264SPhilipp Reisner return -1091; 2734b411b363SPhilipp Reisner 2735b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2736b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 27374a23f264SPhilipp Reisner 27384a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 27394a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 27404a23f264SPhilipp Reisner 2741b411b363SPhilipp Reisner return -1; 2742b411b363SPhilipp Reisner } 2743b411b363SPhilipp Reisner } 2744b411b363SPhilipp Reisner 2745b411b363SPhilipp Reisner *rule_nr = 60; 2746b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2747b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2748b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2749b411b363SPhilipp Reisner if (self == peer) 2750b411b363SPhilipp Reisner return -2; 2751b411b363SPhilipp Reisner } 2752b411b363SPhilipp Reisner 2753b411b363SPhilipp Reisner *rule_nr = 70; 2754b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2755b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2756b411b363SPhilipp Reisner if (self == peer) 2757b411b363SPhilipp Reisner return 1; 2758b411b363SPhilipp Reisner 2759b411b363SPhilipp Reisner *rule_nr = 71; 2760b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2761b411b363SPhilipp Reisner if (self == peer) { 276231890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 27634a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 27644a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 27654a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2766b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2767b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2768b411b363SPhilipp Reisner 276931890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27704a23f264SPhilipp Reisner return -1091; 2771b411b363SPhilipp Reisner 2772b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2773b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2774b411b363SPhilipp Reisner 27754a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2776b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2777b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2778b411b363SPhilipp Reisner 2779b411b363SPhilipp Reisner return 1; 2780b411b363SPhilipp Reisner } 2781b411b363SPhilipp Reisner } 2782b411b363SPhilipp Reisner 2783b411b363SPhilipp Reisner 2784b411b363SPhilipp Reisner *rule_nr = 80; 2785d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2786b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2787b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2788b411b363SPhilipp Reisner if (self == peer) 2789b411b363SPhilipp Reisner return 2; 2790b411b363SPhilipp Reisner } 2791b411b363SPhilipp Reisner 2792b411b363SPhilipp Reisner *rule_nr = 90; 2793b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2794b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2795b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2796b411b363SPhilipp Reisner return 100; 2797b411b363SPhilipp Reisner 2798b411b363SPhilipp Reisner *rule_nr = 100; 2799b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2800b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2801b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2802b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2803b411b363SPhilipp Reisner if (self == peer) 2804b411b363SPhilipp Reisner return -100; 2805b411b363SPhilipp Reisner } 2806b411b363SPhilipp Reisner } 2807b411b363SPhilipp Reisner 2808b411b363SPhilipp Reisner return -1000; 2809b411b363SPhilipp Reisner } 2810b411b363SPhilipp Reisner 2811b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2812b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2813b411b363SPhilipp Reisner */ 2814b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2815b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2816b411b363SPhilipp Reisner { 2817b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2818b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 281944ed167dSPhilipp Reisner struct net_conf *nc; 282044ed167dSPhilipp Reisner int hg, rule_nr, rr_conflict, dry_run; 2821b411b363SPhilipp Reisner 2822b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2823b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2824b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2825b411b363SPhilipp Reisner 2826b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2827b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2828b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2829b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2830b411b363SPhilipp Reisner 2831b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2832b411b363SPhilipp Reisner 2833b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2834b411b363SPhilipp Reisner 2835b411b363SPhilipp Reisner if (hg == -1000) { 2836b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2837b411b363SPhilipp Reisner return C_MASK; 2838b411b363SPhilipp Reisner } 28394a23f264SPhilipp Reisner if (hg < -1000) { 28404a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2841b411b363SPhilipp Reisner return C_MASK; 2842b411b363SPhilipp Reisner } 2843b411b363SPhilipp Reisner 2844b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2845b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2846b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2847b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2848b411b363SPhilipp Reisner if (f) 2849b411b363SPhilipp Reisner hg = hg*2; 2850b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2851b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2852b411b363SPhilipp Reisner } 2853b411b363SPhilipp Reisner 28543a11a487SAdam Gandelman if (abs(hg) == 100) 28553a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 28563a11a487SAdam Gandelman 285744ed167dSPhilipp Reisner rcu_read_lock(); 285844ed167dSPhilipp Reisner nc = rcu_dereference(mdev->tconn->net_conf); 285944ed167dSPhilipp Reisner 286044ed167dSPhilipp Reisner if (hg == 100 || (hg == -100 && nc->always_asbp)) { 2861b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2862b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2863b411b363SPhilipp Reisner int forced = (hg == -100); 2864b411b363SPhilipp Reisner 2865b411b363SPhilipp Reisner switch (pcount) { 2866b411b363SPhilipp Reisner case 0: 2867b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2868b411b363SPhilipp Reisner break; 2869b411b363SPhilipp Reisner case 1: 2870b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2871b411b363SPhilipp Reisner break; 2872b411b363SPhilipp Reisner case 2: 2873b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2874b411b363SPhilipp Reisner break; 2875b411b363SPhilipp Reisner } 2876b411b363SPhilipp Reisner if (abs(hg) < 100) { 2877b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2878b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2879b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2880b411b363SPhilipp Reisner if (forced) { 2881b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2882b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2883b411b363SPhilipp Reisner hg = hg*2; 2884b411b363SPhilipp Reisner } 2885b411b363SPhilipp Reisner } 2886b411b363SPhilipp Reisner } 2887b411b363SPhilipp Reisner 2888b411b363SPhilipp Reisner if (hg == -100) { 288944ed167dSPhilipp Reisner if (nc->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2890b411b363SPhilipp Reisner hg = -1; 289144ed167dSPhilipp Reisner if (!nc->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2892b411b363SPhilipp Reisner hg = 1; 2893b411b363SPhilipp Reisner 2894b411b363SPhilipp Reisner if (abs(hg) < 100) 2895b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2896b411b363SPhilipp Reisner "Sync from %s node\n", 2897b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2898b411b363SPhilipp Reisner } 289944ed167dSPhilipp Reisner rr_conflict = nc->rr_conflict; 290044ed167dSPhilipp Reisner dry_run = nc->dry_run; 290144ed167dSPhilipp Reisner rcu_read_unlock(); 2902b411b363SPhilipp Reisner 2903b411b363SPhilipp Reisner if (hg == -100) { 2904580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2905580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2906580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2907580b9767SLars Ellenberg * to that disk, in a way... */ 29083a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2909b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2910b411b363SPhilipp Reisner return C_MASK; 2911b411b363SPhilipp Reisner } 2912b411b363SPhilipp Reisner 2913b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2914b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2915b411b363SPhilipp Reisner return C_MASK; 2916b411b363SPhilipp Reisner } 2917b411b363SPhilipp Reisner 2918b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2919b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 292044ed167dSPhilipp Reisner switch (rr_conflict) { 2921b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2922b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2923b411b363SPhilipp Reisner /* fall through */ 2924b411b363SPhilipp Reisner case ASB_DISCONNECT: 2925b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2926b411b363SPhilipp Reisner return C_MASK; 2927b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2928b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2929b411b363SPhilipp Reisner "assumption\n"); 2930b411b363SPhilipp Reisner } 2931b411b363SPhilipp Reisner } 2932b411b363SPhilipp Reisner 293344ed167dSPhilipp Reisner if (dry_run || test_bit(CONN_DRY_RUN, &mdev->tconn->flags)) { 2934cf14c2e9SPhilipp Reisner if (hg == 0) 2935cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2936cf14c2e9SPhilipp Reisner else 2937cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2938cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2939cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2940cf14c2e9SPhilipp Reisner return C_MASK; 2941cf14c2e9SPhilipp Reisner } 2942cf14c2e9SPhilipp Reisner 2943b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2944b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 294520ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 294620ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 2947b411b363SPhilipp Reisner return C_MASK; 2948b411b363SPhilipp Reisner } 2949b411b363SPhilipp Reisner 2950b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2951b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2952b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2953b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2954b411b363SPhilipp Reisner } else { 2955b411b363SPhilipp Reisner rv = C_CONNECTED; 2956b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2957b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2958b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2959b411b363SPhilipp Reisner } 2960b411b363SPhilipp Reisner } 2961b411b363SPhilipp Reisner 2962b411b363SPhilipp Reisner return rv; 2963b411b363SPhilipp Reisner } 2964b411b363SPhilipp Reisner 2965b411b363SPhilipp Reisner /* returns 1 if invalid */ 2966b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2967b411b363SPhilipp Reisner { 2968b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2969b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2970b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2971b411b363SPhilipp Reisner return 0; 2972b411b363SPhilipp Reisner 2973b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2974b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2975b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2976b411b363SPhilipp Reisner return 1; 2977b411b363SPhilipp Reisner 2978b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2979b411b363SPhilipp Reisner if (peer == self) 2980b411b363SPhilipp Reisner return 0; 2981b411b363SPhilipp Reisner 2982b411b363SPhilipp Reisner /* everything es is invalid. */ 2983b411b363SPhilipp Reisner return 1; 2984b411b363SPhilipp Reisner } 2985b411b363SPhilipp Reisner 2986e2857216SAndreas Gruenbacher static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi) 2987b411b363SPhilipp Reisner { 2988e658983aSAndreas Gruenbacher struct p_protocol *p = pi->data; 2989b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2990cf14c2e9SPhilipp Reisner int p_want_lose, p_two_primaries, cf; 2991b411b363SPhilipp Reisner char p_integrity_alg[SHARED_SECRET_MAX] = ""; 299244ed167dSPhilipp Reisner unsigned char *my_alg; 299344ed167dSPhilipp Reisner struct net_conf *nc; 2994b411b363SPhilipp Reisner 2995b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2996b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 2997b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 2998b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 2999b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 3000cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 3001cf14c2e9SPhilipp Reisner p_want_lose = cf & CF_WANT_LOSE; 3002cf14c2e9SPhilipp Reisner 30037204624cSPhilipp Reisner clear_bit(CONN_DRY_RUN, &tconn->flags); 3004cf14c2e9SPhilipp Reisner 3005cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 30067204624cSPhilipp Reisner set_bit(CONN_DRY_RUN, &tconn->flags); 3007b411b363SPhilipp Reisner 300844ed167dSPhilipp Reisner rcu_read_lock(); 300944ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 301044ed167dSPhilipp Reisner 301144ed167dSPhilipp Reisner if (p_proto != nc->wire_protocol && tconn->agreed_pro_version < 100) { 30127204624cSPhilipp Reisner conn_err(tconn, "incompatible communication protocols\n"); 301344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3014b411b363SPhilipp Reisner } 3015b411b363SPhilipp Reisner 301644ed167dSPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, nc->after_sb_0p)) { 30177204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-0pri settings\n"); 301844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3019b411b363SPhilipp Reisner } 3020b411b363SPhilipp Reisner 302144ed167dSPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, nc->after_sb_1p)) { 30227204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-1pri settings\n"); 302344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3024b411b363SPhilipp Reisner } 3025b411b363SPhilipp Reisner 302644ed167dSPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, nc->after_sb_2p)) { 30277204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-2pri settings\n"); 302844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3029b411b363SPhilipp Reisner } 3030b411b363SPhilipp Reisner 303144ed167dSPhilipp Reisner if (p_want_lose && nc->want_lose) { 30327204624cSPhilipp Reisner conn_err(tconn, "both sides have the 'want_lose' flag set\n"); 303344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3034b411b363SPhilipp Reisner } 3035b411b363SPhilipp Reisner 303644ed167dSPhilipp Reisner if (p_two_primaries != nc->two_primaries) { 30377204624cSPhilipp Reisner conn_err(tconn, "incompatible setting of the two-primaries options\n"); 303844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3039b411b363SPhilipp Reisner } 3040b411b363SPhilipp Reisner 304144ed167dSPhilipp Reisner my_alg = nc->integrity_alg; 304244ed167dSPhilipp Reisner rcu_read_unlock(); 304344ed167dSPhilipp Reisner 30447204624cSPhilipp Reisner if (tconn->agreed_pro_version >= 87) { 304582bc0194SAndreas Gruenbacher int err; 3046b411b363SPhilipp Reisner 3047e2857216SAndreas Gruenbacher err = drbd_recv_all(tconn, p_integrity_alg, pi->size); 304882bc0194SAndreas Gruenbacher if (err) 304982bc0194SAndreas Gruenbacher return err; 3050b411b363SPhilipp Reisner 3051b411b363SPhilipp Reisner p_integrity_alg[SHARED_SECRET_MAX-1] = 0; 3052b411b363SPhilipp Reisner if (strcmp(p_integrity_alg, my_alg)) { 30537204624cSPhilipp Reisner conn_err(tconn, "incompatible setting of the data-integrity-alg\n"); 3054b411b363SPhilipp Reisner goto disconnect; 3055b411b363SPhilipp Reisner } 30567204624cSPhilipp Reisner conn_info(tconn, "data-integrity-alg: %s\n", 3057b411b363SPhilipp Reisner my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); 3058b411b363SPhilipp Reisner } 3059b411b363SPhilipp Reisner 306082bc0194SAndreas Gruenbacher return 0; 3061b411b363SPhilipp Reisner 306244ed167dSPhilipp Reisner disconnect_rcu_unlock: 306344ed167dSPhilipp Reisner rcu_read_unlock(); 3064b411b363SPhilipp Reisner disconnect: 30657204624cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 306682bc0194SAndreas Gruenbacher return -EIO; 3067b411b363SPhilipp Reisner } 3068b411b363SPhilipp Reisner 3069b411b363SPhilipp Reisner /* helper function 3070b411b363SPhilipp Reisner * input: alg name, feature name 3071b411b363SPhilipp Reisner * return: NULL (alg name was "") 3072b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 3073b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 3074b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 3075b411b363SPhilipp Reisner const char *alg, const char *name) 3076b411b363SPhilipp Reisner { 3077b411b363SPhilipp Reisner struct crypto_hash *tfm; 3078b411b363SPhilipp Reisner 3079b411b363SPhilipp Reisner if (!alg[0]) 3080b411b363SPhilipp Reisner return NULL; 3081b411b363SPhilipp Reisner 3082b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 3083b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 3084b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 3085b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 3086b411b363SPhilipp Reisner return tfm; 3087b411b363SPhilipp Reisner } 3088b411b363SPhilipp Reisner if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 3089b411b363SPhilipp Reisner crypto_free_hash(tfm); 3090b411b363SPhilipp Reisner dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); 3091b411b363SPhilipp Reisner return ERR_PTR(-EINVAL); 3092b411b363SPhilipp Reisner } 3093b411b363SPhilipp Reisner return tfm; 3094b411b363SPhilipp Reisner } 3095b411b363SPhilipp Reisner 30964a76b161SAndreas Gruenbacher static int ignore_remaining_packet(struct drbd_tconn *tconn, struct packet_info *pi) 3097b411b363SPhilipp Reisner { 30984a76b161SAndreas Gruenbacher void *buffer = tconn->data.rbuf; 30994a76b161SAndreas Gruenbacher int size = pi->size; 31004a76b161SAndreas Gruenbacher 31014a76b161SAndreas Gruenbacher while (size) { 31024a76b161SAndreas Gruenbacher int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); 31034a76b161SAndreas Gruenbacher s = drbd_recv(tconn, buffer, s); 31044a76b161SAndreas Gruenbacher if (s <= 0) { 31054a76b161SAndreas Gruenbacher if (s < 0) 31064a76b161SAndreas Gruenbacher return s; 31074a76b161SAndreas Gruenbacher break; 31084a76b161SAndreas Gruenbacher } 31094a76b161SAndreas Gruenbacher size -= s; 31104a76b161SAndreas Gruenbacher } 31114a76b161SAndreas Gruenbacher if (size) 31124a76b161SAndreas Gruenbacher return -EIO; 31134a76b161SAndreas Gruenbacher return 0; 31144a76b161SAndreas Gruenbacher } 31154a76b161SAndreas Gruenbacher 31164a76b161SAndreas Gruenbacher /* 31174a76b161SAndreas Gruenbacher * config_unknown_volume - device configuration command for unknown volume 31184a76b161SAndreas Gruenbacher * 31194a76b161SAndreas Gruenbacher * When a device is added to an existing connection, the node on which the 31204a76b161SAndreas Gruenbacher * device is added first will send configuration commands to its peer but the 31214a76b161SAndreas Gruenbacher * peer will not know about the device yet. It will warn and ignore these 31224a76b161SAndreas Gruenbacher * commands. Once the device is added on the second node, the second node will 31234a76b161SAndreas Gruenbacher * send the same device configuration commands, but in the other direction. 31244a76b161SAndreas Gruenbacher * 31254a76b161SAndreas Gruenbacher * (We can also end up here if drbd is misconfigured.) 31264a76b161SAndreas Gruenbacher */ 31274a76b161SAndreas Gruenbacher static int config_unknown_volume(struct drbd_tconn *tconn, struct packet_info *pi) 31284a76b161SAndreas Gruenbacher { 31294a76b161SAndreas Gruenbacher conn_warn(tconn, "Volume %u unknown; ignoring %s packet\n", 31304a76b161SAndreas Gruenbacher pi->vnr, cmdname(pi->cmd)); 31314a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 31324a76b161SAndreas Gruenbacher } 31334a76b161SAndreas Gruenbacher 31344a76b161SAndreas Gruenbacher static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi) 31354a76b161SAndreas Gruenbacher { 31364a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3137e658983aSAndreas Gruenbacher struct p_rs_param_95 *p; 3138b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 3139b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 3140b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 314191fd4dadSPhilipp Reisner struct net_conf *old_conf, *new_conf = NULL; 31424a76b161SAndreas Gruenbacher const int apv = tconn->agreed_pro_version; 3143778f271dSPhilipp Reisner int *rs_plan_s = NULL; 3144778f271dSPhilipp Reisner int fifo_size = 0; 314582bc0194SAndreas Gruenbacher int err; 3146b411b363SPhilipp Reisner 31474a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 31484a76b161SAndreas Gruenbacher if (!mdev) 31494a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 31504a76b161SAndreas Gruenbacher 3151b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 3152b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 3153b411b363SPhilipp Reisner + SHARED_SECRET_MAX 31548e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 31558e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 3156b411b363SPhilipp Reisner 3157e2857216SAndreas Gruenbacher if (pi->size > exp_max_sz) { 3158b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 3159e2857216SAndreas Gruenbacher pi->size, exp_max_sz); 316082bc0194SAndreas Gruenbacher return -EIO; 3161b411b363SPhilipp Reisner } 3162b411b363SPhilipp Reisner 3163b411b363SPhilipp Reisner if (apv <= 88) { 3164e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param); 3165e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 31668e26f9ccSPhilipp Reisner } else if (apv <= 94) { 3167e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_89); 3168e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3169b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 31708e26f9ccSPhilipp Reisner } else { 3171e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_95); 3172e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3173b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 3174b411b363SPhilipp Reisner } 3175b411b363SPhilipp Reisner 3176b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 3177e658983aSAndreas Gruenbacher p = pi->data; 3178b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 3179b411b363SPhilipp Reisner 3180e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, header_size); 318182bc0194SAndreas Gruenbacher if (err) 318282bc0194SAndreas Gruenbacher return err; 3183b411b363SPhilipp Reisner 3184f399002eSLars Ellenberg if (get_ldev(mdev)) { 3185f399002eSLars Ellenberg mdev->ldev->dc.resync_rate = be32_to_cpu(p->rate); 3186f399002eSLars Ellenberg put_ldev(mdev); 3187f399002eSLars Ellenberg } 3188b411b363SPhilipp Reisner 3189b411b363SPhilipp Reisner if (apv >= 88) { 3190b411b363SPhilipp Reisner if (apv == 88) { 3191b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 3192b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 3193b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 3194b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 319582bc0194SAndreas Gruenbacher return -EIO; 3196b411b363SPhilipp Reisner } 3197b411b363SPhilipp Reisner 319882bc0194SAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size); 319982bc0194SAndreas Gruenbacher if (err) 320082bc0194SAndreas Gruenbacher return err; 3201b411b363SPhilipp Reisner 3202b411b363SPhilipp Reisner /* we expect NUL terminated string */ 3203b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3204b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 3205b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 3206b411b363SPhilipp Reisner 3207b411b363SPhilipp Reisner } else /* apv >= 89 */ { 3208b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 3209b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3210b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 3211b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 3212b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 3213b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 3214b411b363SPhilipp Reisner } 3215b411b363SPhilipp Reisner 321691fd4dadSPhilipp Reisner mutex_lock(&mdev->tconn->net_conf_update); 321791fd4dadSPhilipp Reisner old_conf = mdev->tconn->net_conf; 321891fd4dadSPhilipp Reisner 321991fd4dadSPhilipp Reisner if (strcmp(old_conf->verify_alg, p->verify_alg)) { 3220b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3221b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 322291fd4dadSPhilipp Reisner old_conf->verify_alg, p->verify_alg); 3223b411b363SPhilipp Reisner goto disconnect; 3224b411b363SPhilipp Reisner } 3225b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 3226b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 3227b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 3228b411b363SPhilipp Reisner verify_tfm = NULL; 3229b411b363SPhilipp Reisner goto disconnect; 3230b411b363SPhilipp Reisner } 3231b411b363SPhilipp Reisner } 3232b411b363SPhilipp Reisner 323391fd4dadSPhilipp Reisner if (apv >= 89 && strcmp(old_conf->csums_alg, p->csums_alg)) { 3234b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3235b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 323691fd4dadSPhilipp Reisner old_conf->csums_alg, p->csums_alg); 3237b411b363SPhilipp Reisner goto disconnect; 3238b411b363SPhilipp Reisner } 3239b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 3240b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 3241b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 3242b411b363SPhilipp Reisner csums_tfm = NULL; 3243b411b363SPhilipp Reisner goto disconnect; 3244b411b363SPhilipp Reisner } 3245b411b363SPhilipp Reisner } 3246b411b363SPhilipp Reisner 3247f399002eSLars Ellenberg if (apv > 94 && get_ldev(mdev)) { 3248f399002eSLars Ellenberg mdev->ldev->dc.resync_rate = be32_to_cpu(p->rate); 3249f399002eSLars Ellenberg mdev->ldev->dc.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 3250f399002eSLars Ellenberg mdev->ldev->dc.c_delay_target = be32_to_cpu(p->c_delay_target); 3251f399002eSLars Ellenberg mdev->ldev->dc.c_fill_target = be32_to_cpu(p->c_fill_target); 3252f399002eSLars Ellenberg mdev->ldev->dc.c_max_rate = be32_to_cpu(p->c_max_rate); 3253778f271dSPhilipp Reisner 3254f399002eSLars Ellenberg fifo_size = (mdev->ldev->dc.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 3255778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 3256778f271dSPhilipp Reisner rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 3257778f271dSPhilipp Reisner if (!rs_plan_s) { 3258778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 3259f399002eSLars Ellenberg put_ldev(mdev); 3260778f271dSPhilipp Reisner goto disconnect; 3261778f271dSPhilipp Reisner } 3262778f271dSPhilipp Reisner } 3263f399002eSLars Ellenberg put_ldev(mdev); 32648e26f9ccSPhilipp Reisner } 3265b411b363SPhilipp Reisner 326691fd4dadSPhilipp Reisner if (verify_tfm || csums_tfm) { 326791fd4dadSPhilipp Reisner new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 326891fd4dadSPhilipp Reisner if (!new_conf) { 326991fd4dadSPhilipp Reisner dev_err(DEV, "Allocation of new net_conf failed\n"); 327091fd4dadSPhilipp Reisner goto disconnect; 327191fd4dadSPhilipp Reisner } 327291fd4dadSPhilipp Reisner 327391fd4dadSPhilipp Reisner *new_conf = *old_conf; 327491fd4dadSPhilipp Reisner 3275b411b363SPhilipp Reisner if (verify_tfm) { 327691fd4dadSPhilipp Reisner strcpy(new_conf->verify_alg, p->verify_alg); 327791fd4dadSPhilipp Reisner new_conf->verify_alg_len = strlen(p->verify_alg) + 1; 3278f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->verify_tfm); 3279f399002eSLars Ellenberg mdev->tconn->verify_tfm = verify_tfm; 3280b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 3281b411b363SPhilipp Reisner } 3282b411b363SPhilipp Reisner if (csums_tfm) { 328391fd4dadSPhilipp Reisner strcpy(new_conf->csums_alg, p->csums_alg); 328491fd4dadSPhilipp Reisner new_conf->csums_alg_len = strlen(p->csums_alg) + 1; 3285f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->csums_tfm); 3286f399002eSLars Ellenberg mdev->tconn->csums_tfm = csums_tfm; 3287b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 3288b411b363SPhilipp Reisner } 328991fd4dadSPhilipp Reisner rcu_assign_pointer(tconn->net_conf, new_conf); 329091fd4dadSPhilipp Reisner } 329191fd4dadSPhilipp Reisner mutex_unlock(&mdev->tconn->net_conf_update); 329291fd4dadSPhilipp Reisner if (new_conf) { 329391fd4dadSPhilipp Reisner synchronize_rcu(); 329491fd4dadSPhilipp Reisner kfree(old_conf); 329591fd4dadSPhilipp Reisner } 329691fd4dadSPhilipp Reisner 329791fd4dadSPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 3298778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size) { 3299778f271dSPhilipp Reisner kfree(mdev->rs_plan_s.values); 3300778f271dSPhilipp Reisner mdev->rs_plan_s.values = rs_plan_s; 3301778f271dSPhilipp Reisner mdev->rs_plan_s.size = fifo_size; 3302778f271dSPhilipp Reisner mdev->rs_planed = 0; 3303778f271dSPhilipp Reisner } 3304b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 3305b411b363SPhilipp Reisner } 330682bc0194SAndreas Gruenbacher return 0; 3307b411b363SPhilipp Reisner 3308b411b363SPhilipp Reisner disconnect: 330991fd4dadSPhilipp Reisner mutex_unlock(&mdev->tconn->net_conf_update); 3310b411b363SPhilipp Reisner /* just for completeness: actually not needed, 3311b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 3312b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 3313b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 3314b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 331538fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 331682bc0194SAndreas Gruenbacher return -EIO; 3317b411b363SPhilipp Reisner } 3318b411b363SPhilipp Reisner 3319b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 3320b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 3321b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 3322b411b363SPhilipp Reisner { 3323b411b363SPhilipp Reisner sector_t d; 3324b411b363SPhilipp Reisner if (a == 0 || b == 0) 3325b411b363SPhilipp Reisner return; 3326b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 3327b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 3328b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 3329b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 3330b411b363SPhilipp Reisner } 3331b411b363SPhilipp Reisner 33324a76b161SAndreas Gruenbacher static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi) 3333b411b363SPhilipp Reisner { 33344a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3335e658983aSAndreas Gruenbacher struct p_sizes *p = pi->data; 3336b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 3337b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 3338b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 3339e89b591cSPhilipp Reisner enum dds_flags ddsf; 3340b411b363SPhilipp Reisner 33414a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 33424a76b161SAndreas Gruenbacher if (!mdev) 33434a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 33444a76b161SAndreas Gruenbacher 3345b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 3346b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 3347b411b363SPhilipp Reisner 3348b411b363SPhilipp Reisner /* just store the peer's disk size for now. 3349b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 3350b411b363SPhilipp Reisner mdev->p_size = p_size; 3351b411b363SPhilipp Reisner 3352b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3353b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 3354b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 3355b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 3356b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 3357b411b363SPhilipp Reisner 3358b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 3359b411b363SPhilipp Reisner * param exchange, choose the minimum */ 3360b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 3361b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 3362b411b363SPhilipp Reisner p_usize); 3363b411b363SPhilipp Reisner 3364b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 3365b411b363SPhilipp Reisner 3366b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 3367b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 3368b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3369b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 3370b411b363SPhilipp Reisner } 3371b411b363SPhilipp Reisner 3372b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3373b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3374a393db6fSPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, 0) < 3375b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3376b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3377b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3378b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 337938fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 3380b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 3381b411b363SPhilipp Reisner put_ldev(mdev); 338282bc0194SAndreas Gruenbacher return -EIO; 3383b411b363SPhilipp Reisner } 3384b411b363SPhilipp Reisner put_ldev(mdev); 3385b411b363SPhilipp Reisner } 3386b411b363SPhilipp Reisner 3387e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3388b411b363SPhilipp Reisner if (get_ldev(mdev)) { 338924c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 3390b411b363SPhilipp Reisner put_ldev(mdev); 3391b411b363SPhilipp Reisner if (dd == dev_size_error) 339282bc0194SAndreas Gruenbacher return -EIO; 3393b411b363SPhilipp Reisner drbd_md_sync(mdev); 3394b411b363SPhilipp Reisner } else { 3395b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3396b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3397b411b363SPhilipp Reisner } 3398b411b363SPhilipp Reisner 339999432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 340099432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 340199432fccSPhilipp Reisner 3402b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3403b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3404b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3405b411b363SPhilipp Reisner ldsc = 1; 3406b411b363SPhilipp Reisner } 3407b411b363SPhilipp Reisner 3408b411b363SPhilipp Reisner put_ldev(mdev); 3409b411b363SPhilipp Reisner } 3410b411b363SPhilipp Reisner 3411b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3412b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3413b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3414b411b363SPhilipp Reisner /* we have different sizes, probably peer 3415b411b363SPhilipp Reisner * needs to know my new size... */ 3416e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3417b411b363SPhilipp Reisner } 3418b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3419b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3420b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3421e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3422e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3423e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3424b411b363SPhilipp Reisner else 3425e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3426e89b591cSPhilipp Reisner } else 3427b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3428b411b363SPhilipp Reisner } 3429b411b363SPhilipp Reisner } 3430b411b363SPhilipp Reisner 343182bc0194SAndreas Gruenbacher return 0; 3432b411b363SPhilipp Reisner } 3433b411b363SPhilipp Reisner 34344a76b161SAndreas Gruenbacher static int receive_uuids(struct drbd_tconn *tconn, struct packet_info *pi) 3435b411b363SPhilipp Reisner { 34364a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3437e658983aSAndreas Gruenbacher struct p_uuids *p = pi->data; 3438b411b363SPhilipp Reisner u64 *p_uuid; 343962b0da3aSLars Ellenberg int i, updated_uuids = 0; 3440b411b363SPhilipp Reisner 34414a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 34424a76b161SAndreas Gruenbacher if (!mdev) 34434a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 34444a76b161SAndreas Gruenbacher 3445b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3446b411b363SPhilipp Reisner 3447b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3448b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3449b411b363SPhilipp Reisner 3450b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3451b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3452b411b363SPhilipp Reisner 3453b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3454b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3455b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3456b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3457b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3458b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 345938fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 346082bc0194SAndreas Gruenbacher return -EIO; 3461b411b363SPhilipp Reisner } 3462b411b363SPhilipp Reisner 3463b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3464b411b363SPhilipp Reisner int skip_initial_sync = 3465b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 346631890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90 && 3467b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3468b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3469b411b363SPhilipp Reisner if (skip_initial_sync) { 3470b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3471b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 347220ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 347320ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3474b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3475b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3476b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3477b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3478b411b363SPhilipp Reisner drbd_md_sync(mdev); 347962b0da3aSLars Ellenberg updated_uuids = 1; 3480b411b363SPhilipp Reisner } 3481b411b363SPhilipp Reisner put_ldev(mdev); 348218a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 348318a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 348418a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 348518a50fa2SPhilipp Reisner for me. */ 348662b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3487b411b363SPhilipp Reisner } 3488b411b363SPhilipp Reisner 3489b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3490b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3491b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3492b411b363SPhilipp Reisner new disk state... */ 34938410da8fSPhilipp Reisner mutex_lock(mdev->state_mutex); 34948410da8fSPhilipp Reisner mutex_unlock(mdev->state_mutex); 3495b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 349662b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 349762b0da3aSLars Ellenberg 349862b0da3aSLars Ellenberg if (updated_uuids) 349962b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3500b411b363SPhilipp Reisner 350182bc0194SAndreas Gruenbacher return 0; 3502b411b363SPhilipp Reisner } 3503b411b363SPhilipp Reisner 3504b411b363SPhilipp Reisner /** 3505b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3506b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3507b411b363SPhilipp Reisner */ 3508b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3509b411b363SPhilipp Reisner { 3510b411b363SPhilipp Reisner union drbd_state ms; 3511b411b363SPhilipp Reisner 3512b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3513b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3514b411b363SPhilipp Reisner 3515b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3516b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3517b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3518b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3519b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3520b411b363SPhilipp Reisner }; 3521b411b363SPhilipp Reisner 3522b411b363SPhilipp Reisner ms.i = ps.i; 3523b411b363SPhilipp Reisner 3524b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3525b411b363SPhilipp Reisner ms.peer = ps.role; 3526b411b363SPhilipp Reisner ms.role = ps.peer; 3527b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3528b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3529b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3530b411b363SPhilipp Reisner 3531b411b363SPhilipp Reisner return ms; 3532b411b363SPhilipp Reisner } 3533b411b363SPhilipp Reisner 35344a76b161SAndreas Gruenbacher static int receive_req_state(struct drbd_tconn *tconn, struct packet_info *pi) 3535b411b363SPhilipp Reisner { 35364a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3537e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3538b411b363SPhilipp Reisner union drbd_state mask, val; 3539bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3540b411b363SPhilipp Reisner 35414a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 35424a76b161SAndreas Gruenbacher if (!mdev) 35434a76b161SAndreas Gruenbacher return -EIO; 35444a76b161SAndreas Gruenbacher 3545b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3546b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3547b411b363SPhilipp Reisner 354825703f83SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && 35498410da8fSPhilipp Reisner mutex_is_locked(mdev->state_mutex)) { 3550b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 355182bc0194SAndreas Gruenbacher return 0; 3552b411b363SPhilipp Reisner } 3553b411b363SPhilipp Reisner 3554b411b363SPhilipp Reisner mask = convert_state(mask); 3555b411b363SPhilipp Reisner val = convert_state(val); 3556b411b363SPhilipp Reisner 3557b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3558b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3559047cd4a6SPhilipp Reisner 3560b411b363SPhilipp Reisner drbd_md_sync(mdev); 3561b411b363SPhilipp Reisner 356282bc0194SAndreas Gruenbacher return 0; 3563b411b363SPhilipp Reisner } 3564b411b363SPhilipp Reisner 3565e2857216SAndreas Gruenbacher static int receive_req_conn_state(struct drbd_tconn *tconn, struct packet_info *pi) 3566dfafcc8aSPhilipp Reisner { 3567e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3568dfafcc8aSPhilipp Reisner union drbd_state mask, val; 3569dfafcc8aSPhilipp Reisner enum drbd_state_rv rv; 3570dfafcc8aSPhilipp Reisner 3571dfafcc8aSPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3572dfafcc8aSPhilipp Reisner val.i = be32_to_cpu(p->val); 3573dfafcc8aSPhilipp Reisner 3574dfafcc8aSPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &tconn->flags) && 3575dfafcc8aSPhilipp Reisner mutex_is_locked(&tconn->cstate_mutex)) { 3576dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG); 357782bc0194SAndreas Gruenbacher return 0; 3578dfafcc8aSPhilipp Reisner } 3579dfafcc8aSPhilipp Reisner 3580dfafcc8aSPhilipp Reisner mask = convert_state(mask); 3581dfafcc8aSPhilipp Reisner val = convert_state(val); 3582dfafcc8aSPhilipp Reisner 3583778bcf2eSPhilipp Reisner rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); 3584dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, rv); 3585dfafcc8aSPhilipp Reisner 358682bc0194SAndreas Gruenbacher return 0; 3587dfafcc8aSPhilipp Reisner } 3588dfafcc8aSPhilipp Reisner 35894a76b161SAndreas Gruenbacher static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi) 3590b411b363SPhilipp Reisner { 35914a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3592e658983aSAndreas Gruenbacher struct p_state *p = pi->data; 35934ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3594b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 359565d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3596b411b363SPhilipp Reisner int rv; 3597b411b363SPhilipp Reisner 35984a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 35994a76b161SAndreas Gruenbacher if (!mdev) 36004a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 36014a76b161SAndreas Gruenbacher 3602b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3603b411b363SPhilipp Reisner 3604b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3605b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3606b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3607b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3608b411b363SPhilipp Reisner } 3609b411b363SPhilipp Reisner 361087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3611b411b363SPhilipp Reisner retry: 361278bae59bSPhilipp Reisner os = ns = drbd_read_state(mdev); 361387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3614b411b363SPhilipp Reisner 3615e9ef7bb6SLars Ellenberg /* peer says his disk is uptodate, while we think it is inconsistent, 3616e9ef7bb6SLars Ellenberg * and this happens while we think we have a sync going on. */ 3617e9ef7bb6SLars Ellenberg if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && 3618e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3619e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3620e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3621e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3622e9ef7bb6SLars Ellenberg * syncing states. 3623e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3624e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3625e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3626e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3627e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3628e9ef7bb6SLars Ellenberg 3629e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3630e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3631e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3632e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3633e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3634e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3635e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 363682bc0194SAndreas Gruenbacher return 0; 3637e9ef7bb6SLars Ellenberg } 3638e9ef7bb6SLars Ellenberg } 3639e9ef7bb6SLars Ellenberg 3640e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3641e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3642e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3643e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3644e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3645e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3646e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3647e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3648e9ef7bb6SLars Ellenberg 36494ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 36504ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3651b411b363SPhilipp Reisner 365267531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 365367531718SPhilipp Reisner ns.conn = C_BEHIND; 365467531718SPhilipp Reisner 3655b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3656b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3657b411b363SPhilipp Reisner int cr; /* consider resync */ 3658b411b363SPhilipp Reisner 3659b411b363SPhilipp Reisner /* if we established a new connection */ 36604ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3661b411b363SPhilipp Reisner /* if we had an established connection 3662b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 36634ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3664b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 36654ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3666b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3667b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3668b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3669b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3670b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 36714ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3672b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3673b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3674b411b363SPhilipp Reisner 3675b411b363SPhilipp Reisner if (cr) 36764ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3677b411b363SPhilipp Reisner 3678b411b363SPhilipp Reisner put_ldev(mdev); 36794ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 36804ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3681b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 368282f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3683b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3684b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3685b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3686580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3687b411b363SPhilipp Reisner } else { 36888169e41bSPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags)) 368982bc0194SAndreas Gruenbacher return -EIO; 36904ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 369138fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 369282bc0194SAndreas Gruenbacher return -EIO; 3693b411b363SPhilipp Reisner } 3694b411b363SPhilipp Reisner } 3695b411b363SPhilipp Reisner } 3696b411b363SPhilipp Reisner 369787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 369878bae59bSPhilipp Reisner if (os.i != drbd_read_state(mdev).i) 3699b411b363SPhilipp Reisner goto retry; 3700b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3701b411b363SPhilipp Reisner ns.peer = peer_state.role; 3702b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3703b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 37044ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3705b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 37064ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 37072aebfabbSPhilipp Reisner if (ns.pdsk == D_CONSISTENT && drbd_suspended(mdev) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3708481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 37098554df1cSAndreas Gruenbacher /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this 3710481c6f50SPhilipp Reisner for temporal network outages! */ 371187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3712481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 37132f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 3714481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3715481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 371638fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); 371782bc0194SAndreas Gruenbacher return -EIO; 3718481c6f50SPhilipp Reisner } 371965d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 372078bae59bSPhilipp Reisner ns = drbd_read_state(mdev); 372187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3722b411b363SPhilipp Reisner 3723b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 372438fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 372582bc0194SAndreas Gruenbacher return -EIO; 3726b411b363SPhilipp Reisner } 3727b411b363SPhilipp Reisner 37284ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 37294ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3730b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3731b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3732b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3733b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3734b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3735b411b363SPhilipp Reisner drbd_send_state(mdev); 3736b411b363SPhilipp Reisner } 3737b411b363SPhilipp Reisner } 3738b411b363SPhilipp Reisner 373991fd4dadSPhilipp Reisner mutex_lock(&mdev->tconn->net_conf_update); 374091fd4dadSPhilipp Reisner mdev->tconn->net_conf->want_lose = 0; /* without copy; single bit op is atomic */ 374191fd4dadSPhilipp Reisner mutex_unlock(&mdev->tconn->net_conf_update); 3742b411b363SPhilipp Reisner 3743b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3744b411b363SPhilipp Reisner 374582bc0194SAndreas Gruenbacher return 0; 3746b411b363SPhilipp Reisner } 3747b411b363SPhilipp Reisner 37484a76b161SAndreas Gruenbacher static int receive_sync_uuid(struct drbd_tconn *tconn, struct packet_info *pi) 3749b411b363SPhilipp Reisner { 37504a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3751e658983aSAndreas Gruenbacher struct p_rs_uuid *p = pi->data; 37524a76b161SAndreas Gruenbacher 37534a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 37544a76b161SAndreas Gruenbacher if (!mdev) 37554a76b161SAndreas Gruenbacher return -EIO; 3756b411b363SPhilipp Reisner 3757b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3758b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3759c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3760b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3761b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3762b411b363SPhilipp Reisner 3763b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3764b411b363SPhilipp Reisner 3765b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3766b411b363SPhilipp Reisner _not_ be rotated into the history */ 3767b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3768b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3769b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3770b411b363SPhilipp Reisner 377162b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3772b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3773b411b363SPhilipp Reisner 3774b411b363SPhilipp Reisner put_ldev(mdev); 3775b411b363SPhilipp Reisner } else 3776b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3777b411b363SPhilipp Reisner 377882bc0194SAndreas Gruenbacher return 0; 3779b411b363SPhilipp Reisner } 3780b411b363SPhilipp Reisner 37812c46407dSAndreas Gruenbacher /** 37822c46407dSAndreas Gruenbacher * receive_bitmap_plain 37832c46407dSAndreas Gruenbacher * 37842c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 37852c46407dSAndreas Gruenbacher * code upon failure. 37862c46407dSAndreas Gruenbacher */ 37872c46407dSAndreas Gruenbacher static int 378850d0b1adSAndreas Gruenbacher receive_bitmap_plain(struct drbd_conf *mdev, unsigned int size, 3789e658983aSAndreas Gruenbacher unsigned long *p, struct bm_xfer_ctx *c) 3790b411b363SPhilipp Reisner { 379150d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - 379250d0b1adSAndreas Gruenbacher drbd_header_size(mdev->tconn); 3793e658983aSAndreas Gruenbacher unsigned int num_words = min_t(size_t, data_size / sizeof(*p), 379450d0b1adSAndreas Gruenbacher c->bm_words - c->word_offset); 3795e658983aSAndreas Gruenbacher unsigned int want = num_words * sizeof(*p); 37962c46407dSAndreas Gruenbacher int err; 3797b411b363SPhilipp Reisner 379850d0b1adSAndreas Gruenbacher if (want != size) { 379950d0b1adSAndreas Gruenbacher dev_err(DEV, "%s:want (%u) != size (%u)\n", __func__, want, size); 38002c46407dSAndreas Gruenbacher return -EIO; 3801b411b363SPhilipp Reisner } 3802b411b363SPhilipp Reisner if (want == 0) 38032c46407dSAndreas Gruenbacher return 0; 3804e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, want); 380582bc0194SAndreas Gruenbacher if (err) 38062c46407dSAndreas Gruenbacher return err; 3807b411b363SPhilipp Reisner 3808e658983aSAndreas Gruenbacher drbd_bm_merge_lel(mdev, c->word_offset, num_words, p); 3809b411b363SPhilipp Reisner 3810b411b363SPhilipp Reisner c->word_offset += num_words; 3811b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3812b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3813b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3814b411b363SPhilipp Reisner 38152c46407dSAndreas Gruenbacher return 1; 3816b411b363SPhilipp Reisner } 3817b411b363SPhilipp Reisner 3818a02d1240SAndreas Gruenbacher static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) 3819a02d1240SAndreas Gruenbacher { 3820a02d1240SAndreas Gruenbacher return (enum drbd_bitmap_code)(p->encoding & 0x0f); 3821a02d1240SAndreas Gruenbacher } 3822a02d1240SAndreas Gruenbacher 3823a02d1240SAndreas Gruenbacher static int dcbp_get_start(struct p_compressed_bm *p) 3824a02d1240SAndreas Gruenbacher { 3825a02d1240SAndreas Gruenbacher return (p->encoding & 0x80) != 0; 3826a02d1240SAndreas Gruenbacher } 3827a02d1240SAndreas Gruenbacher 3828a02d1240SAndreas Gruenbacher static int dcbp_get_pad_bits(struct p_compressed_bm *p) 3829a02d1240SAndreas Gruenbacher { 3830a02d1240SAndreas Gruenbacher return (p->encoding >> 4) & 0x7; 3831a02d1240SAndreas Gruenbacher } 3832a02d1240SAndreas Gruenbacher 38332c46407dSAndreas Gruenbacher /** 38342c46407dSAndreas Gruenbacher * recv_bm_rle_bits 38352c46407dSAndreas Gruenbacher * 38362c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 38372c46407dSAndreas Gruenbacher * code upon failure. 38382c46407dSAndreas Gruenbacher */ 38392c46407dSAndreas Gruenbacher static int 3840b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3841b411b363SPhilipp Reisner struct p_compressed_bm *p, 3842c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3843c6d25cfeSPhilipp Reisner unsigned int len) 3844b411b363SPhilipp Reisner { 3845b411b363SPhilipp Reisner struct bitstream bs; 3846b411b363SPhilipp Reisner u64 look_ahead; 3847b411b363SPhilipp Reisner u64 rl; 3848b411b363SPhilipp Reisner u64 tmp; 3849b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3850b411b363SPhilipp Reisner unsigned long e; 3851a02d1240SAndreas Gruenbacher int toggle = dcbp_get_start(p); 3852b411b363SPhilipp Reisner int have; 3853b411b363SPhilipp Reisner int bits; 3854b411b363SPhilipp Reisner 3855a02d1240SAndreas Gruenbacher bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); 3856b411b363SPhilipp Reisner 3857b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3858b411b363SPhilipp Reisner if (bits < 0) 38592c46407dSAndreas Gruenbacher return -EIO; 3860b411b363SPhilipp Reisner 3861b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3862b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3863b411b363SPhilipp Reisner if (bits <= 0) 38642c46407dSAndreas Gruenbacher return -EIO; 3865b411b363SPhilipp Reisner 3866b411b363SPhilipp Reisner if (toggle) { 3867b411b363SPhilipp Reisner e = s + rl -1; 3868b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3869b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 38702c46407dSAndreas Gruenbacher return -EIO; 3871b411b363SPhilipp Reisner } 3872b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3873b411b363SPhilipp Reisner } 3874b411b363SPhilipp Reisner 3875b411b363SPhilipp Reisner if (have < bits) { 3876b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3877b411b363SPhilipp Reisner have, bits, look_ahead, 3878b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3879b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 38802c46407dSAndreas Gruenbacher return -EIO; 3881b411b363SPhilipp Reisner } 3882b411b363SPhilipp Reisner look_ahead >>= bits; 3883b411b363SPhilipp Reisner have -= bits; 3884b411b363SPhilipp Reisner 3885b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3886b411b363SPhilipp Reisner if (bits < 0) 38872c46407dSAndreas Gruenbacher return -EIO; 3888b411b363SPhilipp Reisner look_ahead |= tmp << have; 3889b411b363SPhilipp Reisner have += bits; 3890b411b363SPhilipp Reisner } 3891b411b363SPhilipp Reisner 3892b411b363SPhilipp Reisner c->bit_offset = s; 3893b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3894b411b363SPhilipp Reisner 38952c46407dSAndreas Gruenbacher return (s != c->bm_bits); 3896b411b363SPhilipp Reisner } 3897b411b363SPhilipp Reisner 38982c46407dSAndreas Gruenbacher /** 38992c46407dSAndreas Gruenbacher * decode_bitmap_c 39002c46407dSAndreas Gruenbacher * 39012c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 39022c46407dSAndreas Gruenbacher * code upon failure. 39032c46407dSAndreas Gruenbacher */ 39042c46407dSAndreas Gruenbacher static int 3905b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3906b411b363SPhilipp Reisner struct p_compressed_bm *p, 3907c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3908c6d25cfeSPhilipp Reisner unsigned int len) 3909b411b363SPhilipp Reisner { 3910a02d1240SAndreas Gruenbacher if (dcbp_get_code(p) == RLE_VLI_Bits) 3911e658983aSAndreas Gruenbacher return recv_bm_rle_bits(mdev, p, c, len - sizeof(*p)); 3912b411b363SPhilipp Reisner 3913b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3914b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3915b411b363SPhilipp Reisner * during all our tests. */ 3916b411b363SPhilipp Reisner 3917b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 391838fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 39192c46407dSAndreas Gruenbacher return -EIO; 3920b411b363SPhilipp Reisner } 3921b411b363SPhilipp Reisner 3922b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3923b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3924b411b363SPhilipp Reisner { 3925b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 392650d0b1adSAndreas Gruenbacher unsigned int header_size = drbd_header_size(mdev->tconn); 392750d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; 392850d0b1adSAndreas Gruenbacher unsigned int plain = 392950d0b1adSAndreas Gruenbacher header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + 393050d0b1adSAndreas Gruenbacher c->bm_words * sizeof(unsigned long); 393150d0b1adSAndreas Gruenbacher unsigned int total = c->bytes[0] + c->bytes[1]; 393250d0b1adSAndreas Gruenbacher unsigned int r; 3933b411b363SPhilipp Reisner 3934b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3935b411b363SPhilipp Reisner if (total == 0) 3936b411b363SPhilipp Reisner return; 3937b411b363SPhilipp Reisner 3938b411b363SPhilipp Reisner /* don't report if not compressed */ 3939b411b363SPhilipp Reisner if (total >= plain) 3940b411b363SPhilipp Reisner return; 3941b411b363SPhilipp Reisner 3942b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3943b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3944b411b363SPhilipp Reisner : (1000 * total / plain); 3945b411b363SPhilipp Reisner 3946b411b363SPhilipp Reisner if (r > 1000) 3947b411b363SPhilipp Reisner r = 1000; 3948b411b363SPhilipp Reisner 3949b411b363SPhilipp Reisner r = 1000 - r; 3950b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3951b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3952b411b363SPhilipp Reisner direction, 3953b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3954b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3955b411b363SPhilipp Reisner total, r/10, r % 10); 3956b411b363SPhilipp Reisner } 3957b411b363SPhilipp Reisner 3958b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3959b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3960b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3961b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3962b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3963b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3964b411b363SPhilipp Reisner 3965b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 39664a76b161SAndreas Gruenbacher static int receive_bitmap(struct drbd_tconn *tconn, struct packet_info *pi) 3967b411b363SPhilipp Reisner { 39684a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3969b411b363SPhilipp Reisner struct bm_xfer_ctx c; 39702c46407dSAndreas Gruenbacher int err; 39714a76b161SAndreas Gruenbacher 39724a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 39734a76b161SAndreas Gruenbacher if (!mdev) 39744a76b161SAndreas Gruenbacher return -EIO; 3975b411b363SPhilipp Reisner 397620ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 397720ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 397820ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 3979b411b363SPhilipp Reisner 3980b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3981b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3982b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3983b411b363SPhilipp Reisner }; 3984b411b363SPhilipp Reisner 39852c46407dSAndreas Gruenbacher for(;;) { 3986e658983aSAndreas Gruenbacher if (pi->cmd == P_BITMAP) 3987e658983aSAndreas Gruenbacher err = receive_bitmap_plain(mdev, pi->size, pi->data, &c); 3988e658983aSAndreas Gruenbacher else if (pi->cmd == P_COMPRESSED_BITMAP) { 3989b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3990b411b363SPhilipp Reisner * and the feature is enabled! */ 3991e658983aSAndreas Gruenbacher struct p_compressed_bm *p = pi->data; 3992b411b363SPhilipp Reisner 399350d0b1adSAndreas Gruenbacher if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(tconn)) { 3994b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 399582bc0194SAndreas Gruenbacher err = -EIO; 3996b411b363SPhilipp Reisner goto out; 3997b411b363SPhilipp Reisner } 3998e658983aSAndreas Gruenbacher if (pi->size <= sizeof(*p)) { 3999e2857216SAndreas Gruenbacher dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", pi->size); 400082bc0194SAndreas Gruenbacher err = -EIO; 400178fcbdaeSAndreas Gruenbacher goto out; 4002b411b363SPhilipp Reisner } 4003e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, pi->size); 4004e658983aSAndreas Gruenbacher if (err) 4005e658983aSAndreas Gruenbacher goto out; 4006e2857216SAndreas Gruenbacher err = decode_bitmap_c(mdev, p, &c, pi->size); 4007b411b363SPhilipp Reisner } else { 4008e2857216SAndreas Gruenbacher dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); 400982bc0194SAndreas Gruenbacher err = -EIO; 4010b411b363SPhilipp Reisner goto out; 4011b411b363SPhilipp Reisner } 4012b411b363SPhilipp Reisner 4013e2857216SAndreas Gruenbacher c.packets[pi->cmd == P_BITMAP]++; 401450d0b1adSAndreas Gruenbacher c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(tconn) + pi->size; 4015b411b363SPhilipp Reisner 40162c46407dSAndreas Gruenbacher if (err <= 0) { 40172c46407dSAndreas Gruenbacher if (err < 0) 40182c46407dSAndreas Gruenbacher goto out; 4019b411b363SPhilipp Reisner break; 40202c46407dSAndreas Gruenbacher } 4021e2857216SAndreas Gruenbacher err = drbd_recv_header(mdev->tconn, pi); 402282bc0194SAndreas Gruenbacher if (err) 4023b411b363SPhilipp Reisner goto out; 40242c46407dSAndreas Gruenbacher } 4025b411b363SPhilipp Reisner 4026b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 4027b411b363SPhilipp Reisner 4028b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 4029de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 4030de1f8e4aSAndreas Gruenbacher 403182bc0194SAndreas Gruenbacher err = drbd_send_bitmap(mdev); 403282bc0194SAndreas Gruenbacher if (err) 4033b411b363SPhilipp Reisner goto out; 4034b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 4035de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 4036de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 4037b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 4038b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 4039b411b363SPhilipp Reisner * other threads may have noticed network errors */ 4040b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 4041b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 4042b411b363SPhilipp Reisner } 404382bc0194SAndreas Gruenbacher err = 0; 4044b411b363SPhilipp Reisner 4045b411b363SPhilipp Reisner out: 404620ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 404782bc0194SAndreas Gruenbacher if (!err && mdev->state.conn == C_WF_BITMAP_S) 4048b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 404982bc0194SAndreas Gruenbacher return err; 4050b411b363SPhilipp Reisner } 4051b411b363SPhilipp Reisner 40524a76b161SAndreas Gruenbacher static int receive_skip(struct drbd_tconn *tconn, struct packet_info *pi) 4053b411b363SPhilipp Reisner { 40544a76b161SAndreas Gruenbacher conn_warn(tconn, "skipping unknown optional packet type %d, l: %d!\n", 4055e2857216SAndreas Gruenbacher pi->cmd, pi->size); 40562de876efSPhilipp Reisner 40574a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 40582de876efSPhilipp Reisner } 40592de876efSPhilipp Reisner 40604a76b161SAndreas Gruenbacher static int receive_UnplugRemote(struct drbd_tconn *tconn, struct packet_info *pi) 4061b411b363SPhilipp Reisner { 4062b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 4063b411b363SPhilipp Reisner * with the data requests being unplugged */ 40644a76b161SAndreas Gruenbacher drbd_tcp_quickack(tconn->data.socket); 4065b411b363SPhilipp Reisner 406682bc0194SAndreas Gruenbacher return 0; 4067b411b363SPhilipp Reisner } 4068b411b363SPhilipp Reisner 40694a76b161SAndreas Gruenbacher static int receive_out_of_sync(struct drbd_tconn *tconn, struct packet_info *pi) 407073a01a18SPhilipp Reisner { 40714a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 4072e658983aSAndreas Gruenbacher struct p_block_desc *p = pi->data; 40734a76b161SAndreas Gruenbacher 40744a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 40754a76b161SAndreas Gruenbacher if (!mdev) 40764a76b161SAndreas Gruenbacher return -EIO; 407773a01a18SPhilipp Reisner 4078f735e363SLars Ellenberg switch (mdev->state.conn) { 4079f735e363SLars Ellenberg case C_WF_SYNC_UUID: 4080f735e363SLars Ellenberg case C_WF_BITMAP_T: 4081f735e363SLars Ellenberg case C_BEHIND: 4082f735e363SLars Ellenberg break; 4083f735e363SLars Ellenberg default: 4084f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 4085f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 4086f735e363SLars Ellenberg } 4087f735e363SLars Ellenberg 408873a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 408973a01a18SPhilipp Reisner 409082bc0194SAndreas Gruenbacher return 0; 409173a01a18SPhilipp Reisner } 409273a01a18SPhilipp Reisner 409302918be2SPhilipp Reisner struct data_cmd { 409402918be2SPhilipp Reisner int expect_payload; 409502918be2SPhilipp Reisner size_t pkt_size; 40964a76b161SAndreas Gruenbacher int (*fn)(struct drbd_tconn *, struct packet_info *); 4097b411b363SPhilipp Reisner }; 4098b411b363SPhilipp Reisner 409902918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 41004a76b161SAndreas Gruenbacher [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 41014a76b161SAndreas Gruenbacher [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 41024a76b161SAndreas Gruenbacher [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 41034a76b161SAndreas Gruenbacher [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 4104e658983aSAndreas Gruenbacher [P_BITMAP] = { 1, 0, receive_bitmap } , 4105e658983aSAndreas Gruenbacher [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , 4106e658983aSAndreas Gruenbacher [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, 41074a76b161SAndreas Gruenbacher [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 41084a76b161SAndreas Gruenbacher [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 4109e658983aSAndreas Gruenbacher [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, 4110e658983aSAndreas Gruenbacher [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, 41114a76b161SAndreas Gruenbacher [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 41124a76b161SAndreas Gruenbacher [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 41134a76b161SAndreas Gruenbacher [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 41144a76b161SAndreas Gruenbacher [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 41154a76b161SAndreas Gruenbacher [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 41164a76b161SAndreas Gruenbacher [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 41174a76b161SAndreas Gruenbacher [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 41184a76b161SAndreas Gruenbacher [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 41194a76b161SAndreas Gruenbacher [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 41204a76b161SAndreas Gruenbacher [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 41214a76b161SAndreas Gruenbacher [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 41224a76b161SAndreas Gruenbacher [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, 412302918be2SPhilipp Reisner }; 412402918be2SPhilipp Reisner 4125eefc2f7dSPhilipp Reisner static void drbdd(struct drbd_tconn *tconn) 4126b411b363SPhilipp Reisner { 412777351055SPhilipp Reisner struct packet_info pi; 412802918be2SPhilipp Reisner size_t shs; /* sub header size */ 412982bc0194SAndreas Gruenbacher int err; 4130b411b363SPhilipp Reisner 4131eefc2f7dSPhilipp Reisner while (get_t_state(&tconn->receiver) == RUNNING) { 4132deebe195SAndreas Gruenbacher struct data_cmd *cmd; 4133deebe195SAndreas Gruenbacher 4134eefc2f7dSPhilipp Reisner drbd_thread_current_set_cpu(&tconn->receiver); 413569bc7bc3SAndreas Gruenbacher if (drbd_recv_header(tconn, &pi)) 413602918be2SPhilipp Reisner goto err_out; 413702918be2SPhilipp Reisner 4138deebe195SAndreas Gruenbacher cmd = &drbd_cmd_handler[pi.cmd]; 41394a76b161SAndreas Gruenbacher if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { 4140eefc2f7dSPhilipp Reisner conn_err(tconn, "unknown packet type %d, l: %d!\n", pi.cmd, pi.size); 414102918be2SPhilipp Reisner goto err_out; 41420b33a916SLars Ellenberg } 4143b411b363SPhilipp Reisner 4144e658983aSAndreas Gruenbacher shs = cmd->pkt_size; 4145e658983aSAndreas Gruenbacher if (pi.size > shs && !cmd->expect_payload) { 4146eefc2f7dSPhilipp Reisner conn_err(tconn, "No payload expected %s l:%d\n", cmdname(pi.cmd), pi.size); 4147c13f7e1aSLars Ellenberg goto err_out; 4148c13f7e1aSLars Ellenberg } 4149c13f7e1aSLars Ellenberg 4150c13f7e1aSLars Ellenberg if (shs) { 4151e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, pi.data, shs); 4152a5c31904SAndreas Gruenbacher if (err) 415302918be2SPhilipp Reisner goto err_out; 4154e2857216SAndreas Gruenbacher pi.size -= shs; 4155b411b363SPhilipp Reisner } 415602918be2SPhilipp Reisner 41574a76b161SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 41584a76b161SAndreas Gruenbacher if (err) { 41599f5bdc33SAndreas Gruenbacher conn_err(tconn, "error receiving %s, e: %d l: %d!\n", 41609f5bdc33SAndreas Gruenbacher cmdname(pi.cmd), err, pi.size); 416102918be2SPhilipp Reisner goto err_out; 4162b411b363SPhilipp Reisner } 4163b411b363SPhilipp Reisner } 416482bc0194SAndreas Gruenbacher return; 416502918be2SPhilipp Reisner 416602918be2SPhilipp Reisner err_out: 4167bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 4168b411b363SPhilipp Reisner } 4169b411b363SPhilipp Reisner 41700e29d163SPhilipp Reisner void conn_flush_workqueue(struct drbd_tconn *tconn) 4171b411b363SPhilipp Reisner { 4172b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 4173b411b363SPhilipp Reisner 4174b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 41750e29d163SPhilipp Reisner barr.w.tconn = tconn; 4176b411b363SPhilipp Reisner init_completion(&barr.done); 41770e29d163SPhilipp Reisner drbd_queue_work(&tconn->data.work, &barr.w); 4178b411b363SPhilipp Reisner wait_for_completion(&barr.done); 4179b411b363SPhilipp Reisner } 4180b411b363SPhilipp Reisner 4181360cc740SPhilipp Reisner static void drbd_disconnect(struct drbd_tconn *tconn) 4182b411b363SPhilipp Reisner { 4183bbeb641cSPhilipp Reisner enum drbd_conns oc; 4184b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 4185b411b363SPhilipp Reisner 4186bbeb641cSPhilipp Reisner if (tconn->cstate == C_STANDALONE) 4187b411b363SPhilipp Reisner return; 4188b411b363SPhilipp Reisner 4189b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 4190360cc740SPhilipp Reisner drbd_thread_stop(&tconn->asender); 4191360cc740SPhilipp Reisner drbd_free_sock(tconn); 4192360cc740SPhilipp Reisner 4193d3fcb490SPhilipp Reisner down_read(&drbd_cfg_rwsem); 4194360cc740SPhilipp Reisner idr_for_each(&tconn->volumes, drbd_disconnected, tconn); 4195d3fcb490SPhilipp Reisner up_read(&drbd_cfg_rwsem); 4196360cc740SPhilipp Reisner conn_info(tconn, "Connection closed\n"); 4197360cc740SPhilipp Reisner 4198cb703454SPhilipp Reisner if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN) 4199cb703454SPhilipp Reisner conn_try_outdate_peer_async(tconn); 4200cb703454SPhilipp Reisner 4201360cc740SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 4202bbeb641cSPhilipp Reisner oc = tconn->cstate; 4203bbeb641cSPhilipp Reisner if (oc >= C_UNCONNECTED) 4204bbeb641cSPhilipp Reisner rv = _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); 4205bbeb641cSPhilipp Reisner 4206360cc740SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 4207360cc740SPhilipp Reisner 4208bbeb641cSPhilipp Reisner if (oc == C_DISCONNECTING) { 420991fd4dadSPhilipp Reisner struct net_conf *old_conf; 4210360cc740SPhilipp Reisner 421191fd4dadSPhilipp Reisner mutex_lock(&tconn->net_conf_update); 421291fd4dadSPhilipp Reisner old_conf = tconn->net_conf; 421391fd4dadSPhilipp Reisner rcu_assign_pointer(tconn->net_conf, NULL); 421491fd4dadSPhilipp Reisner conn_free_crypto(tconn); 421591fd4dadSPhilipp Reisner mutex_unlock(&tconn->net_conf_update); 4216360cc740SPhilipp Reisner 421791fd4dadSPhilipp Reisner synchronize_rcu(); 421891fd4dadSPhilipp Reisner kfree(old_conf); 421991fd4dadSPhilipp Reisner 4220bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE); 4221360cc740SPhilipp Reisner } 4222360cc740SPhilipp Reisner } 4223360cc740SPhilipp Reisner 4224360cc740SPhilipp Reisner static int drbd_disconnected(int vnr, void *p, void *data) 4225360cc740SPhilipp Reisner { 4226360cc740SPhilipp Reisner struct drbd_conf *mdev = (struct drbd_conf *)p; 4227360cc740SPhilipp Reisner enum drbd_fencing_p fp; 4228360cc740SPhilipp Reisner unsigned int i; 4229b411b363SPhilipp Reisner 423085719573SPhilipp Reisner /* wait for current activity to cease. */ 423187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4232b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 4233b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 4234b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 423587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4236b411b363SPhilipp Reisner 4237b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 4238b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 4239b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 4240b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 4241b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 4242b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 4243b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 4244b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 4245b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 4246b411b363SPhilipp Reisner * on the fly. */ 4247b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 4248b411b363SPhilipp Reisner mdev->rs_total = 0; 4249b411b363SPhilipp Reisner mdev->rs_failed = 0; 4250b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 4251b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 4252b411b363SPhilipp Reisner 42537fde2be9SPhilipp Reisner del_timer(&mdev->request_timer); 42547fde2be9SPhilipp Reisner 4255b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 4256b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 4257b411b363SPhilipp Reisner 4258b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 4259b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 4260b411b363SPhilipp Reisner * to be "canceled" */ 4261a21e9298SPhilipp Reisner drbd_flush_workqueue(mdev); 4262b411b363SPhilipp Reisner 4263a990be46SAndreas Gruenbacher drbd_finish_peer_reqs(mdev); 4264b411b363SPhilipp Reisner 4265b411b363SPhilipp Reisner kfree(mdev->p_uuid); 4266b411b363SPhilipp Reisner mdev->p_uuid = NULL; 4267b411b363SPhilipp Reisner 42682aebfabbSPhilipp Reisner if (!drbd_suspended(mdev)) 42692f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 4270b411b363SPhilipp Reisner 4271b411b363SPhilipp Reisner drbd_md_sync(mdev); 4272b411b363SPhilipp Reisner 4273b411b363SPhilipp Reisner fp = FP_DONT_CARE; 4274b411b363SPhilipp Reisner if (get_ldev(mdev)) { 4275b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 4276b411b363SPhilipp Reisner put_ldev(mdev); 4277b411b363SPhilipp Reisner } 4278b411b363SPhilipp Reisner 427920ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 428020ceb2b2SLars Ellenberg * if any. */ 428120ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 428220ceb2b2SLars Ellenberg 4283b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 4284b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 4285b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 4286b411b363SPhilipp Reisner * 4287b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 4288b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 4289b411b363SPhilipp Reisner */ 42907721f567SAndreas Gruenbacher i = drbd_free_peer_reqs(mdev, &mdev->net_ee); 4291b411b363SPhilipp Reisner if (i) 4292b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 4293435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 4294435f0740SLars Ellenberg if (i) 4295435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 4296b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 4297b411b363SPhilipp Reisner if (i) 429845bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 4299b411b363SPhilipp Reisner 4300b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 4301b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 4302b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 4303b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 4304b411b363SPhilipp Reisner 4305b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 4306b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 4307b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 4308360cc740SPhilipp Reisner 4309360cc740SPhilipp Reisner return 0; 4310b411b363SPhilipp Reisner } 4311b411b363SPhilipp Reisner 4312b411b363SPhilipp Reisner /* 4313b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 4314b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 4315b411b363SPhilipp Reisner * 4316b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 4317b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 4318b411b363SPhilipp Reisner * 4319b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 4320b411b363SPhilipp Reisner */ 43216038178eSAndreas Gruenbacher static int drbd_send_features(struct drbd_tconn *tconn) 4322b411b363SPhilipp Reisner { 43239f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 43249f5bdc33SAndreas Gruenbacher struct p_connection_features *p; 4325b411b363SPhilipp Reisner 43269f5bdc33SAndreas Gruenbacher sock = &tconn->data; 43279f5bdc33SAndreas Gruenbacher p = conn_prepare_command(tconn, sock); 43289f5bdc33SAndreas Gruenbacher if (!p) 4329e8d17b01SAndreas Gruenbacher return -EIO; 4330b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 4331b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 4332b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 43339f5bdc33SAndreas Gruenbacher return conn_send_command(tconn, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); 4334b411b363SPhilipp Reisner } 4335b411b363SPhilipp Reisner 4336b411b363SPhilipp Reisner /* 4337b411b363SPhilipp Reisner * return values: 4338b411b363SPhilipp Reisner * 1 yes, we have a valid connection 4339b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 4340b411b363SPhilipp Reisner * -1 peer talks different language, 4341b411b363SPhilipp Reisner * no point in trying again, please go standalone. 4342b411b363SPhilipp Reisner */ 43436038178eSAndreas Gruenbacher static int drbd_do_features(struct drbd_tconn *tconn) 4344b411b363SPhilipp Reisner { 434565d11ed6SPhilipp Reisner /* ASSERT current == tconn->receiver ... */ 4346e658983aSAndreas Gruenbacher struct p_connection_features *p; 4347e658983aSAndreas Gruenbacher const int expect = sizeof(struct p_connection_features); 434877351055SPhilipp Reisner struct packet_info pi; 4349a5c31904SAndreas Gruenbacher int err; 4350b411b363SPhilipp Reisner 43516038178eSAndreas Gruenbacher err = drbd_send_features(tconn); 4352e8d17b01SAndreas Gruenbacher if (err) 4353b411b363SPhilipp Reisner return 0; 4354b411b363SPhilipp Reisner 435569bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 435669bc7bc3SAndreas Gruenbacher if (err) 4357b411b363SPhilipp Reisner return 0; 4358b411b363SPhilipp Reisner 43596038178eSAndreas Gruenbacher if (pi.cmd != P_CONNECTION_FEATURES) { 43606038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", 436177351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4362b411b363SPhilipp Reisner return -1; 4363b411b363SPhilipp Reisner } 4364b411b363SPhilipp Reisner 436577351055SPhilipp Reisner if (pi.size != expect) { 43666038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures length: %u, received: %u\n", 436777351055SPhilipp Reisner expect, pi.size); 4368b411b363SPhilipp Reisner return -1; 4369b411b363SPhilipp Reisner } 4370b411b363SPhilipp Reisner 4371e658983aSAndreas Gruenbacher p = pi.data; 4372e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, p, expect); 4373a5c31904SAndreas Gruenbacher if (err) 4374b411b363SPhilipp Reisner return 0; 4375b411b363SPhilipp Reisner 4376b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 4377b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 4378b411b363SPhilipp Reisner if (p->protocol_max == 0) 4379b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 4380b411b363SPhilipp Reisner 4381b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 4382b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 4383b411b363SPhilipp Reisner goto incompat; 4384b411b363SPhilipp Reisner 438565d11ed6SPhilipp Reisner tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 4386b411b363SPhilipp Reisner 438765d11ed6SPhilipp Reisner conn_info(tconn, "Handshake successful: " 438865d11ed6SPhilipp Reisner "Agreed network protocol version %d\n", tconn->agreed_pro_version); 4389b411b363SPhilipp Reisner 4390b411b363SPhilipp Reisner return 1; 4391b411b363SPhilipp Reisner 4392b411b363SPhilipp Reisner incompat: 439365d11ed6SPhilipp Reisner conn_err(tconn, "incompatible DRBD dialects: " 4394b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 4395b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 4396b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 4397b411b363SPhilipp Reisner return -1; 4398b411b363SPhilipp Reisner } 4399b411b363SPhilipp Reisner 4400b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 440113e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4402b411b363SPhilipp Reisner { 4403b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 4404b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 4405b10d96cbSJohannes Thoma return -1; 4406b411b363SPhilipp Reisner } 4407b411b363SPhilipp Reisner #else 4408b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4409b10d96cbSJohannes Thoma 4410b10d96cbSJohannes Thoma /* Return value: 4411b10d96cbSJohannes Thoma 1 - auth succeeded, 4412b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4413b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4414b10d96cbSJohannes Thoma */ 4415b10d96cbSJohannes Thoma 441613e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4417b411b363SPhilipp Reisner { 44189f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 4419b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4420b411b363SPhilipp Reisner struct scatterlist sg; 4421b411b363SPhilipp Reisner char *response = NULL; 4422b411b363SPhilipp Reisner char *right_response = NULL; 4423b411b363SPhilipp Reisner char *peers_ch = NULL; 442444ed167dSPhilipp Reisner unsigned int key_len; 442544ed167dSPhilipp Reisner char secret[SHARED_SECRET_MAX]; /* 64 byte */ 4426b411b363SPhilipp Reisner unsigned int resp_size; 4427b411b363SPhilipp Reisner struct hash_desc desc; 442877351055SPhilipp Reisner struct packet_info pi; 442944ed167dSPhilipp Reisner struct net_conf *nc; 443069bc7bc3SAndreas Gruenbacher int err, rv; 4431b411b363SPhilipp Reisner 44329f5bdc33SAndreas Gruenbacher /* FIXME: Put the challenge/response into the preallocated socket buffer. */ 44339f5bdc33SAndreas Gruenbacher 443444ed167dSPhilipp Reisner rcu_read_lock(); 443544ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 443644ed167dSPhilipp Reisner key_len = strlen(nc->shared_secret); 443744ed167dSPhilipp Reisner memcpy(secret, nc->shared_secret, key_len); 443844ed167dSPhilipp Reisner rcu_read_unlock(); 443944ed167dSPhilipp Reisner 444013e6037dSPhilipp Reisner desc.tfm = tconn->cram_hmac_tfm; 4441b411b363SPhilipp Reisner desc.flags = 0; 4442b411b363SPhilipp Reisner 444344ed167dSPhilipp Reisner rv = crypto_hash_setkey(tconn->cram_hmac_tfm, (u8 *)secret, key_len); 4444b411b363SPhilipp Reisner if (rv) { 444513e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); 4446b10d96cbSJohannes Thoma rv = -1; 4447b411b363SPhilipp Reisner goto fail; 4448b411b363SPhilipp Reisner } 4449b411b363SPhilipp Reisner 4450b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4451b411b363SPhilipp Reisner 44529f5bdc33SAndreas Gruenbacher sock = &tconn->data; 44539f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 44549f5bdc33SAndreas Gruenbacher rv = 0; 44559f5bdc33SAndreas Gruenbacher goto fail; 44569f5bdc33SAndreas Gruenbacher } 4457e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_CHALLENGE, 0, 44589f5bdc33SAndreas Gruenbacher my_challenge, CHALLENGE_LEN); 4459b411b363SPhilipp Reisner if (!rv) 4460b411b363SPhilipp Reisner goto fail; 4461b411b363SPhilipp Reisner 446269bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 446369bc7bc3SAndreas Gruenbacher if (err) { 446469bc7bc3SAndreas Gruenbacher rv = 0; 4465b411b363SPhilipp Reisner goto fail; 446669bc7bc3SAndreas Gruenbacher } 4467b411b363SPhilipp Reisner 446877351055SPhilipp Reisner if (pi.cmd != P_AUTH_CHALLENGE) { 446913e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", 447077351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4471b411b363SPhilipp Reisner rv = 0; 4472b411b363SPhilipp Reisner goto fail; 4473b411b363SPhilipp Reisner } 4474b411b363SPhilipp Reisner 447577351055SPhilipp Reisner if (pi.size > CHALLENGE_LEN * 2) { 447613e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge payload too big.\n"); 4477b10d96cbSJohannes Thoma rv = -1; 4478b411b363SPhilipp Reisner goto fail; 4479b411b363SPhilipp Reisner } 4480b411b363SPhilipp Reisner 448177351055SPhilipp Reisner peers_ch = kmalloc(pi.size, GFP_NOIO); 4482b411b363SPhilipp Reisner if (peers_ch == NULL) { 448313e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of peers_ch failed\n"); 4484b10d96cbSJohannes Thoma rv = -1; 4485b411b363SPhilipp Reisner goto fail; 4486b411b363SPhilipp Reisner } 4487b411b363SPhilipp Reisner 4488a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, peers_ch, pi.size); 4489a5c31904SAndreas Gruenbacher if (err) { 4490b411b363SPhilipp Reisner rv = 0; 4491b411b363SPhilipp Reisner goto fail; 4492b411b363SPhilipp Reisner } 4493b411b363SPhilipp Reisner 449413e6037dSPhilipp Reisner resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); 4495b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4496b411b363SPhilipp Reisner if (response == NULL) { 449713e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of response failed\n"); 4498b10d96cbSJohannes Thoma rv = -1; 4499b411b363SPhilipp Reisner goto fail; 4500b411b363SPhilipp Reisner } 4501b411b363SPhilipp Reisner 4502b411b363SPhilipp Reisner sg_init_table(&sg, 1); 450377351055SPhilipp Reisner sg_set_buf(&sg, peers_ch, pi.size); 4504b411b363SPhilipp Reisner 4505b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4506b411b363SPhilipp Reisner if (rv) { 450713e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4508b10d96cbSJohannes Thoma rv = -1; 4509b411b363SPhilipp Reisner goto fail; 4510b411b363SPhilipp Reisner } 4511b411b363SPhilipp Reisner 45129f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 45139f5bdc33SAndreas Gruenbacher rv = 0; 45149f5bdc33SAndreas Gruenbacher goto fail; 45159f5bdc33SAndreas Gruenbacher } 4516e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_RESPONSE, 0, 45179f5bdc33SAndreas Gruenbacher response, resp_size); 4518b411b363SPhilipp Reisner if (!rv) 4519b411b363SPhilipp Reisner goto fail; 4520b411b363SPhilipp Reisner 452169bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 452269bc7bc3SAndreas Gruenbacher if (err) { 452369bc7bc3SAndreas Gruenbacher rv = 0; 4524b411b363SPhilipp Reisner goto fail; 452569bc7bc3SAndreas Gruenbacher } 4526b411b363SPhilipp Reisner 452777351055SPhilipp Reisner if (pi.cmd != P_AUTH_RESPONSE) { 452813e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", 452977351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4530b411b363SPhilipp Reisner rv = 0; 4531b411b363SPhilipp Reisner goto fail; 4532b411b363SPhilipp Reisner } 4533b411b363SPhilipp Reisner 453477351055SPhilipp Reisner if (pi.size != resp_size) { 453513e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse payload of wrong size\n"); 4536b411b363SPhilipp Reisner rv = 0; 4537b411b363SPhilipp Reisner goto fail; 4538b411b363SPhilipp Reisner } 4539b411b363SPhilipp Reisner 4540a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, response , resp_size); 4541a5c31904SAndreas Gruenbacher if (err) { 4542b411b363SPhilipp Reisner rv = 0; 4543b411b363SPhilipp Reisner goto fail; 4544b411b363SPhilipp Reisner } 4545b411b363SPhilipp Reisner 4546b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 45472d1ee87dSJulia Lawall if (right_response == NULL) { 454813e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of right_response failed\n"); 4549b10d96cbSJohannes Thoma rv = -1; 4550b411b363SPhilipp Reisner goto fail; 4551b411b363SPhilipp Reisner } 4552b411b363SPhilipp Reisner 4553b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4554b411b363SPhilipp Reisner 4555b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4556b411b363SPhilipp Reisner if (rv) { 455713e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4558b10d96cbSJohannes Thoma rv = -1; 4559b411b363SPhilipp Reisner goto fail; 4560b411b363SPhilipp Reisner } 4561b411b363SPhilipp Reisner 4562b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4563b411b363SPhilipp Reisner 4564b411b363SPhilipp Reisner if (rv) 456544ed167dSPhilipp Reisner conn_info(tconn, "Peer authenticated using %d bytes HMAC\n", 456644ed167dSPhilipp Reisner resp_size); 4567b10d96cbSJohannes Thoma else 4568b10d96cbSJohannes Thoma rv = -1; 4569b411b363SPhilipp Reisner 4570b411b363SPhilipp Reisner fail: 4571b411b363SPhilipp Reisner kfree(peers_ch); 4572b411b363SPhilipp Reisner kfree(response); 4573b411b363SPhilipp Reisner kfree(right_response); 4574b411b363SPhilipp Reisner 4575b411b363SPhilipp Reisner return rv; 4576b411b363SPhilipp Reisner } 4577b411b363SPhilipp Reisner #endif 4578b411b363SPhilipp Reisner 4579b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4580b411b363SPhilipp Reisner { 4581392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 4582b411b363SPhilipp Reisner int h; 4583b411b363SPhilipp Reisner 45844d641dd7SPhilipp Reisner conn_info(tconn, "receiver (re)started\n"); 4585b411b363SPhilipp Reisner 4586b411b363SPhilipp Reisner do { 45874d641dd7SPhilipp Reisner h = drbd_connect(tconn); 4588b411b363SPhilipp Reisner if (h == 0) { 45894d641dd7SPhilipp Reisner drbd_disconnect(tconn); 459020ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4591b411b363SPhilipp Reisner } 4592b411b363SPhilipp Reisner if (h == -1) { 45934d641dd7SPhilipp Reisner conn_warn(tconn, "Discarding network configuration.\n"); 4594bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 4595b411b363SPhilipp Reisner } 4596b411b363SPhilipp Reisner } while (h == 0); 4597b411b363SPhilipp Reisner 459891fd4dadSPhilipp Reisner if (h > 0) 45994d641dd7SPhilipp Reisner drbdd(tconn); 4600b411b363SPhilipp Reisner 46014d641dd7SPhilipp Reisner drbd_disconnect(tconn); 4602b411b363SPhilipp Reisner 46034d641dd7SPhilipp Reisner conn_info(tconn, "receiver terminated\n"); 4604b411b363SPhilipp Reisner return 0; 4605b411b363SPhilipp Reisner } 4606b411b363SPhilipp Reisner 4607b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4608b411b363SPhilipp Reisner 4609e05e1e59SAndreas Gruenbacher static int got_conn_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4610b411b363SPhilipp Reisner { 4611e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4612b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4613b411b363SPhilipp Reisner 4614fc3b10a4SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4615fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags); 4616fc3b10a4SPhilipp Reisner } else { 4617fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags); 4618fc3b10a4SPhilipp Reisner conn_err(tconn, "Requested state change failed by peer: %s (%d)\n", 4619fc3b10a4SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4620fc3b10a4SPhilipp Reisner } 4621fc3b10a4SPhilipp Reisner wake_up(&tconn->ping_wait); 4622e4f78edeSPhilipp Reisner 46232735a594SAndreas Gruenbacher return 0; 4624fc3b10a4SPhilipp Reisner } 4625e4f78edeSPhilipp Reisner 46261952e916SAndreas Gruenbacher static int got_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4627e4f78edeSPhilipp Reisner { 46281952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4629e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4630e4f78edeSPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4631e4f78edeSPhilipp Reisner 46321952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 46331952e916SAndreas Gruenbacher if (!mdev) 46342735a594SAndreas Gruenbacher return -EIO; 46351952e916SAndreas Gruenbacher 4636e4f78edeSPhilipp Reisner if (retcode >= SS_SUCCESS) { 4637e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4638e4f78edeSPhilipp Reisner } else { 4639e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4640e4f78edeSPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4641e4f78edeSPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4642e4f78edeSPhilipp Reisner } 4643e4f78edeSPhilipp Reisner wake_up(&mdev->state_wait); 4644e4f78edeSPhilipp Reisner 46452735a594SAndreas Gruenbacher return 0; 4646b411b363SPhilipp Reisner } 4647b411b363SPhilipp Reisner 4648e05e1e59SAndreas Gruenbacher static int got_Ping(struct drbd_tconn *tconn, struct packet_info *pi) 4649b411b363SPhilipp Reisner { 46502735a594SAndreas Gruenbacher return drbd_send_ping_ack(tconn); 4651b411b363SPhilipp Reisner 4652b411b363SPhilipp Reisner } 4653b411b363SPhilipp Reisner 4654e05e1e59SAndreas Gruenbacher static int got_PingAck(struct drbd_tconn *tconn, struct packet_info *pi) 4655b411b363SPhilipp Reisner { 4656b411b363SPhilipp Reisner /* restore idle timeout */ 46572a67d8b9SPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; 46582a67d8b9SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) 46592a67d8b9SPhilipp Reisner wake_up(&tconn->ping_wait); 4660b411b363SPhilipp Reisner 46612735a594SAndreas Gruenbacher return 0; 4662b411b363SPhilipp Reisner } 4663b411b363SPhilipp Reisner 46641952e916SAndreas Gruenbacher static int got_IsInSync(struct drbd_tconn *tconn, struct packet_info *pi) 4665b411b363SPhilipp Reisner { 46661952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4667e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4668b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4669b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4670b411b363SPhilipp Reisner 46711952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 46721952e916SAndreas Gruenbacher if (!mdev) 46732735a594SAndreas Gruenbacher return -EIO; 46741952e916SAndreas Gruenbacher 467531890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 4676b411b363SPhilipp Reisner 4677b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4678b411b363SPhilipp Reisner 46791d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4680b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4681b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4682b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4683b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 46841d53f09eSLars Ellenberg put_ldev(mdev); 46851d53f09eSLars Ellenberg } 4686b411b363SPhilipp Reisner dec_rs_pending(mdev); 4687778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4688b411b363SPhilipp Reisner 46892735a594SAndreas Gruenbacher return 0; 4690b411b363SPhilipp Reisner } 4691b411b363SPhilipp Reisner 4692bc9c5c41SAndreas Gruenbacher static int 4693bc9c5c41SAndreas Gruenbacher validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, 4694bc9c5c41SAndreas Gruenbacher struct rb_root *root, const char *func, 4695bc9c5c41SAndreas Gruenbacher enum drbd_req_event what, bool missing_ok) 4696b411b363SPhilipp Reisner { 4697b411b363SPhilipp Reisner struct drbd_request *req; 4698b411b363SPhilipp Reisner struct bio_and_error m; 4699b411b363SPhilipp Reisner 470087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4701bc9c5c41SAndreas Gruenbacher req = find_request(mdev, root, id, sector, missing_ok, func); 4702b411b363SPhilipp Reisner if (unlikely(!req)) { 470387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 470485997675SAndreas Gruenbacher return -EIO; 4705b411b363SPhilipp Reisner } 4706b411b363SPhilipp Reisner __req_mod(req, what, &m); 470787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4708b411b363SPhilipp Reisner 4709b411b363SPhilipp Reisner if (m.bio) 4710b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 471185997675SAndreas Gruenbacher return 0; 4712b411b363SPhilipp Reisner } 4713b411b363SPhilipp Reisner 47141952e916SAndreas Gruenbacher static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi) 4715b411b363SPhilipp Reisner { 47161952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4717e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4718b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4719b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4720b411b363SPhilipp Reisner enum drbd_req_event what; 4721b411b363SPhilipp Reisner 47221952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 47231952e916SAndreas Gruenbacher if (!mdev) 47242735a594SAndreas Gruenbacher return -EIO; 47251952e916SAndreas Gruenbacher 4726b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4727b411b363SPhilipp Reisner 4728579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4729b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4730b411b363SPhilipp Reisner dec_rs_pending(mdev); 47312735a594SAndreas Gruenbacher return 0; 4732b411b363SPhilipp Reisner } 4733e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 4734b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 47358554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER_AND_SIS; 4736b411b363SPhilipp Reisner break; 4737b411b363SPhilipp Reisner case P_WRITE_ACK: 47388554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER; 4739b411b363SPhilipp Reisner break; 4740b411b363SPhilipp Reisner case P_RECV_ACK: 47418554df1cSAndreas Gruenbacher what = RECV_ACKED_BY_PEER; 4742b411b363SPhilipp Reisner break; 47437be8da07SAndreas Gruenbacher case P_DISCARD_WRITE: 47447be8da07SAndreas Gruenbacher what = DISCARD_WRITE; 47457be8da07SAndreas Gruenbacher break; 47467be8da07SAndreas Gruenbacher case P_RETRY_WRITE: 47477be8da07SAndreas Gruenbacher what = POSTPONE_WRITE; 4748b411b363SPhilipp Reisner break; 4749b411b363SPhilipp Reisner default: 47502735a594SAndreas Gruenbacher BUG(); 4751b411b363SPhilipp Reisner } 4752b411b363SPhilipp Reisner 47532735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 4754bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4755bc9c5c41SAndreas Gruenbacher what, false); 4756b411b363SPhilipp Reisner } 4757b411b363SPhilipp Reisner 47581952e916SAndreas Gruenbacher static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi) 4759b411b363SPhilipp Reisner { 47601952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4761e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4762b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 47632deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 476485997675SAndreas Gruenbacher int err; 4765b411b363SPhilipp Reisner 47661952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 47671952e916SAndreas Gruenbacher if (!mdev) 47682735a594SAndreas Gruenbacher return -EIO; 47691952e916SAndreas Gruenbacher 4770b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4771b411b363SPhilipp Reisner 4772579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4773b411b363SPhilipp Reisner dec_rs_pending(mdev); 4774b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 47752735a594SAndreas Gruenbacher return 0; 4776b411b363SPhilipp Reisner } 47772deb8336SPhilipp Reisner 477885997675SAndreas Gruenbacher err = validate_req_change_req_state(mdev, p->block_id, sector, 4779bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4780303d1448SPhilipp Reisner NEG_ACKED, true); 478185997675SAndreas Gruenbacher if (err) { 47822deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 47832deb8336SPhilipp Reisner The master bio might already be completed, therefore the 4784c3afd8f5SAndreas Gruenbacher request is no longer in the collision hash. */ 47852deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 47862deb8336SPhilipp Reisner but then get a P_NEG_ACK afterwards. */ 4787c3afd8f5SAndreas Gruenbacher drbd_set_out_of_sync(mdev, sector, size); 47882deb8336SPhilipp Reisner } 47892735a594SAndreas Gruenbacher return 0; 4790b411b363SPhilipp Reisner } 4791b411b363SPhilipp Reisner 47921952e916SAndreas Gruenbacher static int got_NegDReply(struct drbd_tconn *tconn, struct packet_info *pi) 4793b411b363SPhilipp Reisner { 47941952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4795e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4796b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4797b411b363SPhilipp Reisner 47981952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 47991952e916SAndreas Gruenbacher if (!mdev) 48002735a594SAndreas Gruenbacher return -EIO; 48011952e916SAndreas Gruenbacher 4802b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 48037be8da07SAndreas Gruenbacher 4804b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4805b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4806b411b363SPhilipp Reisner 48072735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 4808bc9c5c41SAndreas Gruenbacher &mdev->read_requests, __func__, 48098554df1cSAndreas Gruenbacher NEG_ACKED, false); 4810b411b363SPhilipp Reisner } 4811b411b363SPhilipp Reisner 48121952e916SAndreas Gruenbacher static int got_NegRSDReply(struct drbd_tconn *tconn, struct packet_info *pi) 4813b411b363SPhilipp Reisner { 48141952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4815b411b363SPhilipp Reisner sector_t sector; 4816b411b363SPhilipp Reisner int size; 4817e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 48181952e916SAndreas Gruenbacher 48191952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48201952e916SAndreas Gruenbacher if (!mdev) 48212735a594SAndreas Gruenbacher return -EIO; 4822b411b363SPhilipp Reisner 4823b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4824b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4825b411b363SPhilipp Reisner 4826b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4827b411b363SPhilipp Reisner 4828b411b363SPhilipp Reisner dec_rs_pending(mdev); 4829b411b363SPhilipp Reisner 4830b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4831b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4832e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 4833d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 4834b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4835d612d309SPhilipp Reisner case P_RS_CANCEL: 4836d612d309SPhilipp Reisner break; 4837d612d309SPhilipp Reisner default: 48382735a594SAndreas Gruenbacher BUG(); 4839d612d309SPhilipp Reisner } 4840b411b363SPhilipp Reisner put_ldev(mdev); 4841b411b363SPhilipp Reisner } 4842b411b363SPhilipp Reisner 48432735a594SAndreas Gruenbacher return 0; 4844b411b363SPhilipp Reisner } 4845b411b363SPhilipp Reisner 48461952e916SAndreas Gruenbacher static int got_BarrierAck(struct drbd_tconn *tconn, struct packet_info *pi) 4847b411b363SPhilipp Reisner { 48481952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4849e658983aSAndreas Gruenbacher struct p_barrier_ack *p = pi->data; 48501952e916SAndreas Gruenbacher 48511952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48521952e916SAndreas Gruenbacher if (!mdev) 48532735a594SAndreas Gruenbacher return -EIO; 4854b411b363SPhilipp Reisner 48552f5cdd0bSPhilipp Reisner tl_release(mdev->tconn, p->barrier, be32_to_cpu(p->set_size)); 4856b411b363SPhilipp Reisner 4857c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 4858c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 4859370a43e7SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) { 4860370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 4861370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 4862c4752ef1SPhilipp Reisner } 4863c4752ef1SPhilipp Reisner 48642735a594SAndreas Gruenbacher return 0; 4865b411b363SPhilipp Reisner } 4866b411b363SPhilipp Reisner 48671952e916SAndreas Gruenbacher static int got_OVResult(struct drbd_tconn *tconn, struct packet_info *pi) 4868b411b363SPhilipp Reisner { 48691952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4870e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4871b411b363SPhilipp Reisner struct drbd_work *w; 4872b411b363SPhilipp Reisner sector_t sector; 4873b411b363SPhilipp Reisner int size; 4874b411b363SPhilipp Reisner 48751952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48761952e916SAndreas Gruenbacher if (!mdev) 48772735a594SAndreas Gruenbacher return -EIO; 48781952e916SAndreas Gruenbacher 4879b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4880b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4881b411b363SPhilipp Reisner 4882b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4883b411b363SPhilipp Reisner 4884b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 48858f7bed77SAndreas Gruenbacher drbd_ov_out_of_sync_found(mdev, sector, size); 4886b411b363SPhilipp Reisner else 48878f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 4888b411b363SPhilipp Reisner 48891d53f09eSLars Ellenberg if (!get_ldev(mdev)) 48902735a594SAndreas Gruenbacher return 0; 48911d53f09eSLars Ellenberg 4892b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4893b411b363SPhilipp Reisner dec_rs_pending(mdev); 4894b411b363SPhilipp Reisner 4895ea5442afSLars Ellenberg --mdev->ov_left; 4896ea5442afSLars Ellenberg 4897ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 4898ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 4899ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 4900ea5442afSLars Ellenberg 4901ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 4902b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4903b411b363SPhilipp Reisner if (w) { 4904b411b363SPhilipp Reisner w->cb = w_ov_finished; 4905a21e9298SPhilipp Reisner w->mdev = mdev; 4906e42325a5SPhilipp Reisner drbd_queue_work_front(&mdev->tconn->data.work, w); 4907b411b363SPhilipp Reisner } else { 4908b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 49098f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 4910b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4911b411b363SPhilipp Reisner } 4912b411b363SPhilipp Reisner } 49131d53f09eSLars Ellenberg put_ldev(mdev); 49142735a594SAndreas Gruenbacher return 0; 4915b411b363SPhilipp Reisner } 4916b411b363SPhilipp Reisner 49171952e916SAndreas Gruenbacher static int got_skip(struct drbd_tconn *tconn, struct packet_info *pi) 49180ced55a3SPhilipp Reisner { 49192735a594SAndreas Gruenbacher return 0; 49200ced55a3SPhilipp Reisner } 49210ced55a3SPhilipp Reisner 4922a990be46SAndreas Gruenbacher static int tconn_finish_peer_reqs(struct drbd_tconn *tconn) 492332862ec7SPhilipp Reisner { 4924082a3439SPhilipp Reisner struct drbd_conf *mdev; 4925082a3439SPhilipp Reisner int i, not_empty = 0; 492632862ec7SPhilipp Reisner 492732862ec7SPhilipp Reisner do { 492832862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 492932862ec7SPhilipp Reisner flush_signals(current); 4930d3fcb490SPhilipp Reisner down_read(&drbd_cfg_rwsem); 4931082a3439SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, i) { 4932d3fcb490SPhilipp Reisner if (drbd_finish_peer_reqs(mdev)) { 4933d3fcb490SPhilipp Reisner up_read(&drbd_cfg_rwsem); 4934082a3439SPhilipp Reisner return 1; /* error */ 4935082a3439SPhilipp Reisner } 4936d3fcb490SPhilipp Reisner } 4937d3fcb490SPhilipp Reisner up_read(&drbd_cfg_rwsem); 493832862ec7SPhilipp Reisner set_bit(SIGNAL_ASENDER, &tconn->flags); 4939082a3439SPhilipp Reisner 4940082a3439SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 4941695d08faSPhilipp Reisner rcu_read_lock(); 4942082a3439SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, i) { 4943082a3439SPhilipp Reisner not_empty = !list_empty(&mdev->done_ee); 4944082a3439SPhilipp Reisner if (not_empty) 4945082a3439SPhilipp Reisner break; 4946082a3439SPhilipp Reisner } 4947695d08faSPhilipp Reisner rcu_read_unlock(); 4948082a3439SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 494932862ec7SPhilipp Reisner } while (not_empty); 495032862ec7SPhilipp Reisner 495132862ec7SPhilipp Reisner return 0; 495232862ec7SPhilipp Reisner } 495332862ec7SPhilipp Reisner 49547201b972SAndreas Gruenbacher struct asender_cmd { 49557201b972SAndreas Gruenbacher size_t pkt_size; 49561952e916SAndreas Gruenbacher int (*fn)(struct drbd_tconn *tconn, struct packet_info *); 49577201b972SAndreas Gruenbacher }; 49587201b972SAndreas Gruenbacher 49597201b972SAndreas Gruenbacher static struct asender_cmd asender_tbl[] = { 4960e658983aSAndreas Gruenbacher [P_PING] = { 0, got_Ping }, 4961e658983aSAndreas Gruenbacher [P_PING_ACK] = { 0, got_PingAck }, 49621952e916SAndreas Gruenbacher [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 49631952e916SAndreas Gruenbacher [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 49641952e916SAndreas Gruenbacher [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 49651952e916SAndreas Gruenbacher [P_DISCARD_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 49661952e916SAndreas Gruenbacher [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 49671952e916SAndreas Gruenbacher [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 49681952e916SAndreas Gruenbacher [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, 49691952e916SAndreas Gruenbacher [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 49701952e916SAndreas Gruenbacher [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 49711952e916SAndreas Gruenbacher [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 49721952e916SAndreas Gruenbacher [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 49731952e916SAndreas Gruenbacher [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 49741952e916SAndreas Gruenbacher [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, 49751952e916SAndreas Gruenbacher [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, 49761952e916SAndreas Gruenbacher [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 49777201b972SAndreas Gruenbacher }; 49787201b972SAndreas Gruenbacher 4979b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4980b411b363SPhilipp Reisner { 4981392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 4982b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 498377351055SPhilipp Reisner struct packet_info pi; 4984257d0af6SPhilipp Reisner int rv; 4985e658983aSAndreas Gruenbacher void *buf = tconn->meta.rbuf; 4986b411b363SPhilipp Reisner int received = 0; 498752b061a4SAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 498852b061a4SAndreas Gruenbacher int expect = header_size; 498944ed167dSPhilipp Reisner bool ping_timeout_active = false; 499044ed167dSPhilipp Reisner struct net_conf *nc; 499144ed167dSPhilipp Reisner int ping_timeo, no_cork, ping_int; 4992b411b363SPhilipp Reisner 4993b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 4994b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 4995b411b363SPhilipp Reisner 4996e77a0a5cSAndreas Gruenbacher while (get_t_state(thi) == RUNNING) { 499780822284SPhilipp Reisner drbd_thread_current_set_cpu(thi); 499844ed167dSPhilipp Reisner 499944ed167dSPhilipp Reisner rcu_read_lock(); 500044ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 500144ed167dSPhilipp Reisner ping_timeo = nc->ping_timeo; 500244ed167dSPhilipp Reisner no_cork = nc->no_cork; 500344ed167dSPhilipp Reisner ping_int = nc->ping_int; 500444ed167dSPhilipp Reisner rcu_read_unlock(); 500544ed167dSPhilipp Reisner 500632862ec7SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &tconn->flags)) { 5007a17647aaSAndreas Gruenbacher if (drbd_send_ping(tconn)) { 500832862ec7SPhilipp Reisner conn_err(tconn, "drbd_send_ping has failed\n"); 5009841ce241SAndreas Gruenbacher goto reconnect; 5010841ce241SAndreas Gruenbacher } 501144ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_timeo * HZ / 10; 501244ed167dSPhilipp Reisner ping_timeout_active = true; 5013b411b363SPhilipp Reisner } 5014b411b363SPhilipp Reisner 501532862ec7SPhilipp Reisner /* TODO: conditionally cork; it may hurt latency if we cork without 501632862ec7SPhilipp Reisner much to send */ 501744ed167dSPhilipp Reisner if (!no_cork) 501832862ec7SPhilipp Reisner drbd_tcp_cork(tconn->meta.socket); 5019a990be46SAndreas Gruenbacher if (tconn_finish_peer_reqs(tconn)) { 5020a990be46SAndreas Gruenbacher conn_err(tconn, "tconn_finish_peer_reqs() failed\n"); 5021b411b363SPhilipp Reisner goto reconnect; 5022082a3439SPhilipp Reisner } 5023b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 502444ed167dSPhilipp Reisner if (!no_cork) 502532862ec7SPhilipp Reisner drbd_tcp_uncork(tconn->meta.socket); 5026b411b363SPhilipp Reisner 5027b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 5028b411b363SPhilipp Reisner if (signal_pending(current)) 5029b411b363SPhilipp Reisner continue; 5030b411b363SPhilipp Reisner 503132862ec7SPhilipp Reisner rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); 503232862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5033b411b363SPhilipp Reisner 5034b411b363SPhilipp Reisner flush_signals(current); 5035b411b363SPhilipp Reisner 5036b411b363SPhilipp Reisner /* Note: 5037b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 5038b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 5039b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 5040b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 5041b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 5042b411b363SPhilipp Reisner * rv == expected: full header or command 5043b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 5044b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 5045b411b363SPhilipp Reisner */ 5046b411b363SPhilipp Reisner if (likely(rv > 0)) { 5047b411b363SPhilipp Reisner received += rv; 5048b411b363SPhilipp Reisner buf += rv; 5049b411b363SPhilipp Reisner } else if (rv == 0) { 505032862ec7SPhilipp Reisner conn_err(tconn, "meta connection shut down by peer.\n"); 5051b411b363SPhilipp Reisner goto reconnect; 5052b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 5053cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 5054cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 505532862ec7SPhilipp Reisner if (time_after(tconn->last_received, 505632862ec7SPhilipp Reisner jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) 5057cb6518cbSLars Ellenberg continue; 5058f36af18cSLars Ellenberg if (ping_timeout_active) { 505932862ec7SPhilipp Reisner conn_err(tconn, "PingAck did not arrive in time.\n"); 5060b411b363SPhilipp Reisner goto reconnect; 5061b411b363SPhilipp Reisner } 506232862ec7SPhilipp Reisner set_bit(SEND_PING, &tconn->flags); 5063b411b363SPhilipp Reisner continue; 5064b411b363SPhilipp Reisner } else if (rv == -EINTR) { 5065b411b363SPhilipp Reisner continue; 5066b411b363SPhilipp Reisner } else { 506732862ec7SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 5068b411b363SPhilipp Reisner goto reconnect; 5069b411b363SPhilipp Reisner } 5070b411b363SPhilipp Reisner 5071b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 5072e658983aSAndreas Gruenbacher if (decode_header(tconn, tconn->meta.rbuf, &pi)) 5073b411b363SPhilipp Reisner goto reconnect; 50747201b972SAndreas Gruenbacher cmd = &asender_tbl[pi.cmd]; 50751952e916SAndreas Gruenbacher if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) { 507632862ec7SPhilipp Reisner conn_err(tconn, "unknown command %d on meta (l: %d)\n", 507777351055SPhilipp Reisner pi.cmd, pi.size); 5078b411b363SPhilipp Reisner goto disconnect; 5079b411b363SPhilipp Reisner } 5080e658983aSAndreas Gruenbacher expect = header_size + cmd->pkt_size; 508152b061a4SAndreas Gruenbacher if (pi.size != expect - header_size) { 508232862ec7SPhilipp Reisner conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", 508377351055SPhilipp Reisner pi.cmd, pi.size); 5084b411b363SPhilipp Reisner goto reconnect; 5085b411b363SPhilipp Reisner } 5086257d0af6SPhilipp Reisner } 5087b411b363SPhilipp Reisner if (received == expect) { 50882735a594SAndreas Gruenbacher bool err; 5089a4fbda8eSPhilipp Reisner 50902735a594SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 50912735a594SAndreas Gruenbacher if (err) { 50921952e916SAndreas Gruenbacher conn_err(tconn, "%pf failed\n", cmd->fn); 5093b411b363SPhilipp Reisner goto reconnect; 50941952e916SAndreas Gruenbacher } 5095b411b363SPhilipp Reisner 5096a4fbda8eSPhilipp Reisner tconn->last_received = jiffies; 5097a4fbda8eSPhilipp Reisner 509844ed167dSPhilipp Reisner if (cmd == &asender_tbl[P_PING_ACK]) { 509944ed167dSPhilipp Reisner /* restore idle timeout */ 510044ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_int * HZ; 510144ed167dSPhilipp Reisner ping_timeout_active = false; 510244ed167dSPhilipp Reisner } 5103f36af18cSLars Ellenberg 5104e658983aSAndreas Gruenbacher buf = tconn->meta.rbuf; 5105b411b363SPhilipp Reisner received = 0; 510652b061a4SAndreas Gruenbacher expect = header_size; 5107b411b363SPhilipp Reisner cmd = NULL; 5108b411b363SPhilipp Reisner } 5109b411b363SPhilipp Reisner } 5110b411b363SPhilipp Reisner 5111b411b363SPhilipp Reisner if (0) { 5112b411b363SPhilipp Reisner reconnect: 5113bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); 5114b411b363SPhilipp Reisner } 5115b411b363SPhilipp Reisner if (0) { 5116b411b363SPhilipp Reisner disconnect: 5117bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 5118b411b363SPhilipp Reisner } 511932862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5120b411b363SPhilipp Reisner 512132862ec7SPhilipp Reisner conn_info(tconn, "asender terminated\n"); 5122b411b363SPhilipp Reisner 5123b411b363SPhilipp Reisner return 0; 5124b411b363SPhilipp Reisner } 5125