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 138788104ca4SAndreas Gruenbacher dgs = 0; 138888104ca4SAndreas Gruenbacher if (mdev->tconn->peer_integrity_tfm) { 138988104ca4SAndreas Gruenbacher dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); 13909f5bdc33SAndreas Gruenbacher /* 13919f5bdc33SAndreas Gruenbacher * FIXME: Receive the incoming digest into the receive buffer 13929f5bdc33SAndreas Gruenbacher * here, together with its struct p_data? 13939f5bdc33SAndreas Gruenbacher */ 1394a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1395a5c31904SAndreas Gruenbacher if (err) 1396b411b363SPhilipp Reisner return NULL; 1397b411b363SPhilipp Reisner data_size -= dgs; 139888104ca4SAndreas Gruenbacher } 1399b411b363SPhilipp Reisner 1400841ce241SAndreas Gruenbacher if (!expect(data_size != 0)) 1401841ce241SAndreas Gruenbacher return NULL; 1402841ce241SAndreas Gruenbacher if (!expect(IS_ALIGNED(data_size, 512))) 1403841ce241SAndreas Gruenbacher return NULL; 1404841ce241SAndreas Gruenbacher if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) 1405841ce241SAndreas Gruenbacher return NULL; 1406b411b363SPhilipp Reisner 14076666032aSLars Ellenberg /* even though we trust out peer, 14086666032aSLars Ellenberg * we sometimes have to double check. */ 14096666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1410fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1411fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 14126666032aSLars Ellenberg (unsigned long long)capacity, 14136666032aSLars Ellenberg (unsigned long long)sector, data_size); 14146666032aSLars Ellenberg return NULL; 14156666032aSLars Ellenberg } 14166666032aSLars Ellenberg 1417b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1418b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1419b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 14200db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, id, sector, data_size, GFP_NOIO); 1421db830c46SAndreas Gruenbacher if (!peer_req) 1422b411b363SPhilipp Reisner return NULL; 142345bb912bSLars Ellenberg 1424b411b363SPhilipp Reisner ds = data_size; 1425db830c46SAndreas Gruenbacher page = peer_req->pages; 142645bb912bSLars Ellenberg page_chain_for_each(page) { 142745bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 14286b4388acSPhilipp Reisner data = kmap(page); 1429a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 14300cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 14316b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 14326b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 14336b4388acSPhilipp Reisner } 1434b411b363SPhilipp Reisner kunmap(page); 1435a5c31904SAndreas Gruenbacher if (err) { 14363967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1437b411b363SPhilipp Reisner return NULL; 1438b411b363SPhilipp Reisner } 1439a5c31904SAndreas Gruenbacher ds -= len; 1440b411b363SPhilipp Reisner } 1441b411b363SPhilipp Reisner 1442b411b363SPhilipp Reisner if (dgs) { 14435b614abeSAndreas Gruenbacher drbd_csum_ee(mdev, mdev->tconn->peer_integrity_tfm, peer_req, dig_vv); 1444b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1445470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1446470be44aSLars Ellenberg (unsigned long long)sector, data_size); 14473967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1448b411b363SPhilipp Reisner return NULL; 1449b411b363SPhilipp Reisner } 1450b411b363SPhilipp Reisner } 1451b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1452db830c46SAndreas Gruenbacher return peer_req; 1453b411b363SPhilipp Reisner } 1454b411b363SPhilipp Reisner 1455b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1456b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1457b411b363SPhilipp Reisner */ 1458b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1459b411b363SPhilipp Reisner { 1460b411b363SPhilipp Reisner struct page *page; 1461a5c31904SAndreas Gruenbacher int err = 0; 1462b411b363SPhilipp Reisner void *data; 1463b411b363SPhilipp Reisner 1464c3470cdeSLars Ellenberg if (!data_size) 1465fc5be839SAndreas Gruenbacher return 0; 1466c3470cdeSLars Ellenberg 1467c37c8ecfSAndreas Gruenbacher page = drbd_alloc_pages(mdev, 1, 1); 1468b411b363SPhilipp Reisner 1469b411b363SPhilipp Reisner data = kmap(page); 1470b411b363SPhilipp Reisner while (data_size) { 1471fc5be839SAndreas Gruenbacher unsigned int len = min_t(int, data_size, PAGE_SIZE); 1472fc5be839SAndreas Gruenbacher 1473a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 1474a5c31904SAndreas Gruenbacher if (err) 1475b411b363SPhilipp Reisner break; 1476a5c31904SAndreas Gruenbacher data_size -= len; 1477b411b363SPhilipp Reisner } 1478b411b363SPhilipp Reisner kunmap(page); 14795cc287e0SAndreas Gruenbacher drbd_free_pages(mdev, page, 0); 1480fc5be839SAndreas Gruenbacher return err; 1481b411b363SPhilipp Reisner } 1482b411b363SPhilipp Reisner 1483b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1484b411b363SPhilipp Reisner sector_t sector, int data_size) 1485b411b363SPhilipp Reisner { 1486b411b363SPhilipp Reisner struct bio_vec *bvec; 1487b411b363SPhilipp Reisner struct bio *bio; 1488a5c31904SAndreas Gruenbacher int dgs, err, i, expect; 1489a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1490a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 1491b411b363SPhilipp Reisner 149288104ca4SAndreas Gruenbacher dgs = 0; 149388104ca4SAndreas Gruenbacher if (mdev->tconn->peer_integrity_tfm) { 149488104ca4SAndreas Gruenbacher dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); 1495a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1496a5c31904SAndreas Gruenbacher if (err) 1497a5c31904SAndreas Gruenbacher return err; 1498b411b363SPhilipp Reisner data_size -= dgs; 149988104ca4SAndreas Gruenbacher } 1500b411b363SPhilipp Reisner 1501b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1502b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1503b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1504b411b363SPhilipp Reisner 1505b411b363SPhilipp Reisner bio = req->master_bio; 1506b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1507b411b363SPhilipp Reisner 1508b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1509a5c31904SAndreas Gruenbacher void *mapped = kmap(bvec->bv_page) + bvec->bv_offset; 1510b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1511a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, mapped, expect); 1512b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1513a5c31904SAndreas Gruenbacher if (err) 1514a5c31904SAndreas Gruenbacher return err; 1515a5c31904SAndreas Gruenbacher data_size -= expect; 1516b411b363SPhilipp Reisner } 1517b411b363SPhilipp Reisner 1518b411b363SPhilipp Reisner if (dgs) { 15195b614abeSAndreas Gruenbacher drbd_csum_bio(mdev, mdev->tconn->peer_integrity_tfm, bio, dig_vv); 1520b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1521b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 152228284cefSAndreas Gruenbacher return -EINVAL; 1523b411b363SPhilipp Reisner } 1524b411b363SPhilipp Reisner } 1525b411b363SPhilipp Reisner 1526b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 152728284cefSAndreas Gruenbacher return 0; 1528b411b363SPhilipp Reisner } 1529b411b363SPhilipp Reisner 1530a990be46SAndreas Gruenbacher /* 1531a990be46SAndreas Gruenbacher * e_end_resync_block() is called in asender context via 1532a990be46SAndreas Gruenbacher * drbd_finish_peer_reqs(). 1533a990be46SAndreas Gruenbacher */ 153499920dc5SAndreas Gruenbacher static int e_end_resync_block(struct drbd_work *w, int unused) 1535b411b363SPhilipp Reisner { 15368050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 15378050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 153800d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1539db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 154099920dc5SAndreas Gruenbacher int err; 1541b411b363SPhilipp Reisner 1542db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1543b411b363SPhilipp Reisner 1544db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1545db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 154699920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); 1547b411b363SPhilipp Reisner } else { 1548b411b363SPhilipp Reisner /* Record failure to sync */ 1549db830c46SAndreas Gruenbacher drbd_rs_failed_io(mdev, sector, peer_req->i.size); 1550b411b363SPhilipp Reisner 155199920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1552b411b363SPhilipp Reisner } 1553b411b363SPhilipp Reisner dec_unacked(mdev); 1554b411b363SPhilipp Reisner 155599920dc5SAndreas Gruenbacher return err; 1556b411b363SPhilipp Reisner } 1557b411b363SPhilipp Reisner 1558b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1559b411b363SPhilipp Reisner { 1560db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1561b411b363SPhilipp Reisner 1562db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); 1563db830c46SAndreas Gruenbacher if (!peer_req) 156445bb912bSLars Ellenberg goto fail; 1565b411b363SPhilipp Reisner 1566b411b363SPhilipp Reisner dec_rs_pending(mdev); 1567b411b363SPhilipp Reisner 1568b411b363SPhilipp Reisner inc_unacked(mdev); 1569b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1570b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1571b411b363SPhilipp Reisner 1572db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_resync_block; 157345bb912bSLars Ellenberg 157487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1575db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->sync_ee); 157687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1577b411b363SPhilipp Reisner 15780f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 1579fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) 1580e1c1b0fcSAndreas Gruenbacher return 0; 158145bb912bSLars Ellenberg 158210f6d992SLars Ellenberg /* don't care for the reason here */ 158310f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 158487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1585db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 158687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 158722cc37a9SLars Ellenberg 15883967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 158945bb912bSLars Ellenberg fail: 159045bb912bSLars Ellenberg put_ldev(mdev); 1591e1c1b0fcSAndreas Gruenbacher return -EIO; 1592b411b363SPhilipp Reisner } 1593b411b363SPhilipp Reisner 1594668eebc6SAndreas Gruenbacher static struct drbd_request * 1595bc9c5c41SAndreas Gruenbacher find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, 1596bc9c5c41SAndreas Gruenbacher sector_t sector, bool missing_ok, const char *func) 1597668eebc6SAndreas Gruenbacher { 1598668eebc6SAndreas Gruenbacher struct drbd_request *req; 1599668eebc6SAndreas Gruenbacher 1600bc9c5c41SAndreas Gruenbacher /* Request object according to our peer */ 1601bc9c5c41SAndreas Gruenbacher req = (struct drbd_request *)(unsigned long)id; 16025e472264SAndreas Gruenbacher if (drbd_contains_interval(root, sector, &req->i) && req->i.local) 1603668eebc6SAndreas Gruenbacher return req; 1604c3afd8f5SAndreas Gruenbacher if (!missing_ok) { 1605c3afd8f5SAndreas Gruenbacher dev_err(DEV, "%s: failed to find request %lu, sector %llus\n", func, 1606c3afd8f5SAndreas Gruenbacher (unsigned long)id, (unsigned long long)sector); 1607c3afd8f5SAndreas Gruenbacher } 1608668eebc6SAndreas Gruenbacher return NULL; 1609668eebc6SAndreas Gruenbacher } 1610668eebc6SAndreas Gruenbacher 16114a76b161SAndreas Gruenbacher static int receive_DataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1612b411b363SPhilipp Reisner { 16134a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1614b411b363SPhilipp Reisner struct drbd_request *req; 1615b411b363SPhilipp Reisner sector_t sector; 161682bc0194SAndreas Gruenbacher int err; 1617e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 16184a76b161SAndreas Gruenbacher 16194a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 16204a76b161SAndreas Gruenbacher if (!mdev) 16214a76b161SAndreas Gruenbacher return -EIO; 1622b411b363SPhilipp Reisner 1623b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1624b411b363SPhilipp Reisner 162587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1626bc9c5c41SAndreas Gruenbacher req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); 162787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1628c3afd8f5SAndreas Gruenbacher if (unlikely(!req)) 162982bc0194SAndreas Gruenbacher return -EIO; 1630b411b363SPhilipp Reisner 163124c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1632b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1633b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1634e2857216SAndreas Gruenbacher err = recv_dless_read(mdev, req, sector, pi->size); 163582bc0194SAndreas Gruenbacher if (!err) 16368554df1cSAndreas Gruenbacher req_mod(req, DATA_RECEIVED); 1637b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1638b411b363SPhilipp Reisner * I don't think we may complete this just yet 1639b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1640b411b363SPhilipp Reisner 164182bc0194SAndreas Gruenbacher return err; 1642b411b363SPhilipp Reisner } 1643b411b363SPhilipp Reisner 16444a76b161SAndreas Gruenbacher static int receive_RSDataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1645b411b363SPhilipp Reisner { 16464a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1647b411b363SPhilipp Reisner sector_t sector; 164882bc0194SAndreas Gruenbacher int err; 1649e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 16504a76b161SAndreas Gruenbacher 16514a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 16524a76b161SAndreas Gruenbacher if (!mdev) 16534a76b161SAndreas Gruenbacher return -EIO; 1654b411b363SPhilipp Reisner 1655b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1656b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1657b411b363SPhilipp Reisner 1658b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1659b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1660b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1661fcefa62eSAndreas Gruenbacher * or in drbd_peer_request_endio. */ 1662e2857216SAndreas Gruenbacher err = recv_resync_read(mdev, sector, pi->size); 1663b411b363SPhilipp Reisner } else { 1664b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1665b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1666b411b363SPhilipp Reisner 1667e2857216SAndreas Gruenbacher err = drbd_drain_block(mdev, pi->size); 1668b411b363SPhilipp Reisner 1669e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 1670b411b363SPhilipp Reisner } 1671b411b363SPhilipp Reisner 1672e2857216SAndreas Gruenbacher atomic_add(pi->size >> 9, &mdev->rs_sect_in); 1673778f271dSPhilipp Reisner 167482bc0194SAndreas Gruenbacher return err; 1675b411b363SPhilipp Reisner } 1676b411b363SPhilipp Reisner 167799920dc5SAndreas Gruenbacher static int w_restart_write(struct drbd_work *w, int cancel) 16787be8da07SAndreas Gruenbacher { 16797be8da07SAndreas Gruenbacher struct drbd_request *req = container_of(w, struct drbd_request, w); 16807be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 16817be8da07SAndreas Gruenbacher struct bio *bio; 16827be8da07SAndreas Gruenbacher unsigned long start_time; 16837be8da07SAndreas Gruenbacher unsigned long flags; 16847be8da07SAndreas Gruenbacher 16857be8da07SAndreas Gruenbacher spin_lock_irqsave(&mdev->tconn->req_lock, flags); 16867be8da07SAndreas Gruenbacher if (!expect(req->rq_state & RQ_POSTPONED)) { 16877be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 168899920dc5SAndreas Gruenbacher return -EIO; 16897be8da07SAndreas Gruenbacher } 16907be8da07SAndreas Gruenbacher bio = req->master_bio; 16917be8da07SAndreas Gruenbacher start_time = req->start_time; 16927be8da07SAndreas Gruenbacher /* Postponed requests will not have their master_bio completed! */ 16937be8da07SAndreas Gruenbacher __req_mod(req, DISCARD_WRITE, NULL); 16947be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 16957be8da07SAndreas Gruenbacher 16967be8da07SAndreas Gruenbacher while (__drbd_make_request(mdev, bio, start_time)) 16977be8da07SAndreas Gruenbacher /* retry */ ; 169899920dc5SAndreas Gruenbacher return 0; 16997be8da07SAndreas Gruenbacher } 17007be8da07SAndreas Gruenbacher 17017be8da07SAndreas Gruenbacher static void restart_conflicting_writes(struct drbd_conf *mdev, 17027be8da07SAndreas Gruenbacher sector_t sector, int size) 17037be8da07SAndreas Gruenbacher { 17047be8da07SAndreas Gruenbacher struct drbd_interval *i; 17057be8da07SAndreas Gruenbacher struct drbd_request *req; 17067be8da07SAndreas Gruenbacher 17077be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 17087be8da07SAndreas Gruenbacher if (!i->local) 17097be8da07SAndreas Gruenbacher continue; 17107be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 17117be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 17127be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) 17137be8da07SAndreas Gruenbacher continue; 17147be8da07SAndreas Gruenbacher if (expect(list_empty(&req->w.list))) { 17157be8da07SAndreas Gruenbacher req->w.mdev = mdev; 17167be8da07SAndreas Gruenbacher req->w.cb = w_restart_write; 17177be8da07SAndreas Gruenbacher drbd_queue_work(&mdev->tconn->data.work, &req->w); 17187be8da07SAndreas Gruenbacher } 17197be8da07SAndreas Gruenbacher } 17207be8da07SAndreas Gruenbacher } 17217be8da07SAndreas Gruenbacher 1722a990be46SAndreas Gruenbacher /* 1723a990be46SAndreas Gruenbacher * e_end_block() is called in asender context via drbd_finish_peer_reqs(). 1724b411b363SPhilipp Reisner */ 172599920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *w, int cancel) 1726b411b363SPhilipp Reisner { 17278050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 17288050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 172900d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1730db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 173199920dc5SAndreas Gruenbacher int err = 0, pcmd; 1732b411b363SPhilipp Reisner 1733303d1448SPhilipp Reisner if (peer_req->flags & EE_SEND_WRITE_ACK) { 1734db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1735b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1736b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1737db830c46SAndreas Gruenbacher peer_req->flags & EE_MAY_SET_IN_SYNC) ? 1738b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 173999920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, pcmd, peer_req); 1740b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1741db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 1742b411b363SPhilipp Reisner } else { 174399920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1744b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1745b411b363SPhilipp Reisner * maybe assert this? */ 1746b411b363SPhilipp Reisner } 1747b411b363SPhilipp Reisner dec_unacked(mdev); 1748b411b363SPhilipp Reisner } 1749b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1750b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 1751302bdeaeSPhilipp Reisner if (peer_req->flags & EE_IN_INTERVAL_TREE) { 175287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1753db830c46SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&peer_req->i)); 1754db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 17557be8da07SAndreas Gruenbacher if (peer_req->flags & EE_RESTART_REQUESTS) 17567be8da07SAndreas Gruenbacher restart_conflicting_writes(mdev, sector, peer_req->i.size); 175787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1758bb3bfe96SAndreas Gruenbacher } else 1759db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1760b411b363SPhilipp Reisner 1761db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1762b411b363SPhilipp Reisner 176399920dc5SAndreas Gruenbacher return err; 1764b411b363SPhilipp Reisner } 1765b411b363SPhilipp Reisner 17667be8da07SAndreas Gruenbacher static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) 1767b411b363SPhilipp Reisner { 17687be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 17698050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 17708050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 177199920dc5SAndreas Gruenbacher int err; 1772b411b363SPhilipp Reisner 177399920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, ack, peer_req); 1774b411b363SPhilipp Reisner dec_unacked(mdev); 1775b411b363SPhilipp Reisner 177699920dc5SAndreas Gruenbacher return err; 1777b411b363SPhilipp Reisner } 1778b411b363SPhilipp Reisner 177999920dc5SAndreas Gruenbacher static int e_send_discard_write(struct drbd_work *w, int unused) 17807be8da07SAndreas Gruenbacher { 17817be8da07SAndreas Gruenbacher return e_send_ack(w, P_DISCARD_WRITE); 17827be8da07SAndreas Gruenbacher } 17837be8da07SAndreas Gruenbacher 178499920dc5SAndreas Gruenbacher static int e_send_retry_write(struct drbd_work *w, int unused) 17857be8da07SAndreas Gruenbacher { 17867be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = w->mdev->tconn; 17877be8da07SAndreas Gruenbacher 17887be8da07SAndreas Gruenbacher return e_send_ack(w, tconn->agreed_pro_version >= 100 ? 17897be8da07SAndreas Gruenbacher P_RETRY_WRITE : P_DISCARD_WRITE); 17907be8da07SAndreas Gruenbacher } 17917be8da07SAndreas Gruenbacher 17923e394da1SAndreas Gruenbacher static bool seq_greater(u32 a, u32 b) 17933e394da1SAndreas Gruenbacher { 17943e394da1SAndreas Gruenbacher /* 17953e394da1SAndreas Gruenbacher * We assume 32-bit wrap-around here. 17963e394da1SAndreas Gruenbacher * For 24-bit wrap-around, we would have to shift: 17973e394da1SAndreas Gruenbacher * a <<= 8; b <<= 8; 17983e394da1SAndreas Gruenbacher */ 17993e394da1SAndreas Gruenbacher return (s32)a - (s32)b > 0; 18003e394da1SAndreas Gruenbacher } 18013e394da1SAndreas Gruenbacher 18023e394da1SAndreas Gruenbacher static u32 seq_max(u32 a, u32 b) 18033e394da1SAndreas Gruenbacher { 18043e394da1SAndreas Gruenbacher return seq_greater(a, b) ? a : b; 18053e394da1SAndreas Gruenbacher } 18063e394da1SAndreas Gruenbacher 18077be8da07SAndreas Gruenbacher static bool need_peer_seq(struct drbd_conf *mdev) 18087be8da07SAndreas Gruenbacher { 18097be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 1810302bdeaeSPhilipp Reisner int tp; 18117be8da07SAndreas Gruenbacher 18127be8da07SAndreas Gruenbacher /* 18137be8da07SAndreas Gruenbacher * We only need to keep track of the last packet_seq number of our peer 18147be8da07SAndreas Gruenbacher * if we are in dual-primary mode and we have the discard flag set; see 18157be8da07SAndreas Gruenbacher * handle_write_conflicts(). 18167be8da07SAndreas Gruenbacher */ 1817302bdeaeSPhilipp Reisner 1818302bdeaeSPhilipp Reisner rcu_read_lock(); 1819302bdeaeSPhilipp Reisner tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; 1820302bdeaeSPhilipp Reisner rcu_read_unlock(); 1821302bdeaeSPhilipp Reisner 1822302bdeaeSPhilipp Reisner return tp && test_bit(DISCARD_CONCURRENT, &tconn->flags); 18237be8da07SAndreas Gruenbacher } 18247be8da07SAndreas Gruenbacher 182543ae077dSAndreas Gruenbacher static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) 18263e394da1SAndreas Gruenbacher { 18273c13b680SLars Ellenberg unsigned int newest_peer_seq; 18283e394da1SAndreas Gruenbacher 18297be8da07SAndreas Gruenbacher if (need_peer_seq(mdev)) { 18303e394da1SAndreas Gruenbacher spin_lock(&mdev->peer_seq_lock); 18313c13b680SLars Ellenberg newest_peer_seq = seq_max(mdev->peer_seq, peer_seq); 18323c13b680SLars Ellenberg mdev->peer_seq = newest_peer_seq; 18333e394da1SAndreas Gruenbacher spin_unlock(&mdev->peer_seq_lock); 18343c13b680SLars Ellenberg /* wake up only if we actually changed mdev->peer_seq */ 18353c13b680SLars Ellenberg if (peer_seq == newest_peer_seq) 18363e394da1SAndreas Gruenbacher wake_up(&mdev->seq_wait); 18373e394da1SAndreas Gruenbacher } 18387be8da07SAndreas Gruenbacher } 18393e394da1SAndreas Gruenbacher 1840b411b363SPhilipp Reisner /* Called from receive_Data. 1841b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1842b411b363SPhilipp Reisner * 1843b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1844b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1845b411b363SPhilipp Reisner * been sent. 1846b411b363SPhilipp Reisner * 1847b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1848b411b363SPhilipp Reisner * 1849b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1850b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1851b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1852b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1853b411b363SPhilipp Reisner * 1854b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1855b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1856b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1857b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1858b411b363SPhilipp Reisner * 1859b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1860b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 18617be8da07SAndreas Gruenbacher static int wait_for_and_update_peer_seq(struct drbd_conf *mdev, const u32 peer_seq) 1862b411b363SPhilipp Reisner { 1863b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1864b411b363SPhilipp Reisner long timeout; 18657be8da07SAndreas Gruenbacher int ret; 18667be8da07SAndreas Gruenbacher 18677be8da07SAndreas Gruenbacher if (!need_peer_seq(mdev)) 18687be8da07SAndreas Gruenbacher return 0; 18697be8da07SAndreas Gruenbacher 1870b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1871b411b363SPhilipp Reisner for (;;) { 18727be8da07SAndreas Gruenbacher if (!seq_greater(peer_seq - 1, mdev->peer_seq)) { 18737be8da07SAndreas Gruenbacher mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); 18747be8da07SAndreas Gruenbacher ret = 0; 1875b411b363SPhilipp Reisner break; 18767be8da07SAndreas Gruenbacher } 1877b411b363SPhilipp Reisner if (signal_pending(current)) { 1878b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1879b411b363SPhilipp Reisner break; 1880b411b363SPhilipp Reisner } 18817be8da07SAndreas Gruenbacher prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1882b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 188344ed167dSPhilipp Reisner rcu_read_lock(); 188444ed167dSPhilipp Reisner timeout = rcu_dereference(mdev->tconn->net_conf)->ping_timeo*HZ/10; 188544ed167dSPhilipp Reisner rcu_read_unlock(); 188671b1c1ebSAndreas Gruenbacher timeout = schedule_timeout(timeout); 1887b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 18887be8da07SAndreas Gruenbacher if (!timeout) { 1889b411b363SPhilipp Reisner ret = -ETIMEDOUT; 189071b1c1ebSAndreas Gruenbacher dev_err(DEV, "Timed out waiting for missing ack packets; disconnecting\n"); 1891b411b363SPhilipp Reisner break; 1892b411b363SPhilipp Reisner } 1893b411b363SPhilipp Reisner } 1894b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 18957be8da07SAndreas Gruenbacher finish_wait(&mdev->seq_wait, &wait); 1896b411b363SPhilipp Reisner return ret; 1897b411b363SPhilipp Reisner } 1898b411b363SPhilipp Reisner 1899688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1900688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1901688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1902688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 190376d2e7ecSPhilipp Reisner { 190476d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 190576d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1906688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 190776d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 190876d2e7ecSPhilipp Reisner } 190976d2e7ecSPhilipp Reisner 19107be8da07SAndreas Gruenbacher static void fail_postponed_requests(struct drbd_conf *mdev, sector_t sector, 19117be8da07SAndreas Gruenbacher unsigned int size) 19127be8da07SAndreas Gruenbacher { 19137be8da07SAndreas Gruenbacher struct drbd_interval *i; 19147be8da07SAndreas Gruenbacher 19157be8da07SAndreas Gruenbacher repeat: 19167be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 19177be8da07SAndreas Gruenbacher struct drbd_request *req; 19187be8da07SAndreas Gruenbacher struct bio_and_error m; 19197be8da07SAndreas Gruenbacher 19207be8da07SAndreas Gruenbacher if (!i->local) 19217be8da07SAndreas Gruenbacher continue; 19227be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 19237be8da07SAndreas Gruenbacher if (!(req->rq_state & RQ_POSTPONED)) 19247be8da07SAndreas Gruenbacher continue; 19257be8da07SAndreas Gruenbacher req->rq_state &= ~RQ_POSTPONED; 19267be8da07SAndreas Gruenbacher __req_mod(req, NEG_ACKED, &m); 19277be8da07SAndreas Gruenbacher spin_unlock_irq(&mdev->tconn->req_lock); 19287be8da07SAndreas Gruenbacher if (m.bio) 19297be8da07SAndreas Gruenbacher complete_master_bio(mdev, &m); 19307be8da07SAndreas Gruenbacher spin_lock_irq(&mdev->tconn->req_lock); 19317be8da07SAndreas Gruenbacher goto repeat; 19327be8da07SAndreas Gruenbacher } 19337be8da07SAndreas Gruenbacher } 19347be8da07SAndreas Gruenbacher 19357be8da07SAndreas Gruenbacher static int handle_write_conflicts(struct drbd_conf *mdev, 19367be8da07SAndreas Gruenbacher struct drbd_peer_request *peer_req) 19377be8da07SAndreas Gruenbacher { 19387be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 19397be8da07SAndreas Gruenbacher bool resolve_conflicts = test_bit(DISCARD_CONCURRENT, &tconn->flags); 19407be8da07SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 19417be8da07SAndreas Gruenbacher const unsigned int size = peer_req->i.size; 19427be8da07SAndreas Gruenbacher struct drbd_interval *i; 19437be8da07SAndreas Gruenbacher bool equal; 19447be8da07SAndreas Gruenbacher int err; 19457be8da07SAndreas Gruenbacher 19467be8da07SAndreas Gruenbacher /* 19477be8da07SAndreas Gruenbacher * Inserting the peer request into the write_requests tree will prevent 19487be8da07SAndreas Gruenbacher * new conflicting local requests from being added. 19497be8da07SAndreas Gruenbacher */ 19507be8da07SAndreas Gruenbacher drbd_insert_interval(&mdev->write_requests, &peer_req->i); 19517be8da07SAndreas Gruenbacher 19527be8da07SAndreas Gruenbacher repeat: 19537be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 19547be8da07SAndreas Gruenbacher if (i == &peer_req->i) 19557be8da07SAndreas Gruenbacher continue; 19567be8da07SAndreas Gruenbacher 19577be8da07SAndreas Gruenbacher if (!i->local) { 19587be8da07SAndreas Gruenbacher /* 19597be8da07SAndreas Gruenbacher * Our peer has sent a conflicting remote request; this 19607be8da07SAndreas Gruenbacher * should not happen in a two-node setup. Wait for the 19617be8da07SAndreas Gruenbacher * earlier peer request to complete. 19627be8da07SAndreas Gruenbacher */ 19637be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, i); 19647be8da07SAndreas Gruenbacher if (err) 19657be8da07SAndreas Gruenbacher goto out; 19667be8da07SAndreas Gruenbacher goto repeat; 19677be8da07SAndreas Gruenbacher } 19687be8da07SAndreas Gruenbacher 19697be8da07SAndreas Gruenbacher equal = i->sector == sector && i->size == size; 19707be8da07SAndreas Gruenbacher if (resolve_conflicts) { 19717be8da07SAndreas Gruenbacher /* 19727be8da07SAndreas Gruenbacher * If the peer request is fully contained within the 19737be8da07SAndreas Gruenbacher * overlapping request, it can be discarded; otherwise, 19747be8da07SAndreas Gruenbacher * it will be retried once all overlapping requests 19757be8da07SAndreas Gruenbacher * have completed. 19767be8da07SAndreas Gruenbacher */ 19777be8da07SAndreas Gruenbacher bool discard = i->sector <= sector && i->sector + 19787be8da07SAndreas Gruenbacher (i->size >> 9) >= sector + (size >> 9); 19797be8da07SAndreas Gruenbacher 19807be8da07SAndreas Gruenbacher if (!equal) 19817be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 19827be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u, " 19837be8da07SAndreas Gruenbacher "assuming %s came first\n", 19847be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 19857be8da07SAndreas Gruenbacher (unsigned long long)sector, size, 19867be8da07SAndreas Gruenbacher discard ? "local" : "remote"); 19877be8da07SAndreas Gruenbacher 19887be8da07SAndreas Gruenbacher inc_unacked(mdev); 19897be8da07SAndreas Gruenbacher peer_req->w.cb = discard ? e_send_discard_write : 19907be8da07SAndreas Gruenbacher e_send_retry_write; 19917be8da07SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->done_ee); 19927be8da07SAndreas Gruenbacher wake_asender(mdev->tconn); 19937be8da07SAndreas Gruenbacher 19947be8da07SAndreas Gruenbacher err = -ENOENT; 19957be8da07SAndreas Gruenbacher goto out; 19967be8da07SAndreas Gruenbacher } else { 19977be8da07SAndreas Gruenbacher struct drbd_request *req = 19987be8da07SAndreas Gruenbacher container_of(i, struct drbd_request, i); 19997be8da07SAndreas Gruenbacher 20007be8da07SAndreas Gruenbacher if (!equal) 20017be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 20027be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u\n", 20037be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 20047be8da07SAndreas Gruenbacher (unsigned long long)sector, size); 20057be8da07SAndreas Gruenbacher 20067be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 20077be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) { 20087be8da07SAndreas Gruenbacher /* 20097be8da07SAndreas Gruenbacher * Wait for the node with the discard flag to 20107be8da07SAndreas Gruenbacher * decide if this request will be discarded or 20117be8da07SAndreas Gruenbacher * retried. Requests that are discarded will 20127be8da07SAndreas Gruenbacher * disappear from the write_requests tree. 20137be8da07SAndreas Gruenbacher * 20147be8da07SAndreas Gruenbacher * In addition, wait for the conflicting 20157be8da07SAndreas Gruenbacher * request to finish locally before submitting 20167be8da07SAndreas Gruenbacher * the conflicting peer request. 20177be8da07SAndreas Gruenbacher */ 20187be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, &req->i); 20197be8da07SAndreas Gruenbacher if (err) { 20207be8da07SAndreas Gruenbacher _conn_request_state(mdev->tconn, 20217be8da07SAndreas Gruenbacher NS(conn, C_TIMEOUT), 20227be8da07SAndreas Gruenbacher CS_HARD); 20237be8da07SAndreas Gruenbacher fail_postponed_requests(mdev, sector, size); 20247be8da07SAndreas Gruenbacher goto out; 20257be8da07SAndreas Gruenbacher } 20267be8da07SAndreas Gruenbacher goto repeat; 20277be8da07SAndreas Gruenbacher } 20287be8da07SAndreas Gruenbacher /* 20297be8da07SAndreas Gruenbacher * Remember to restart the conflicting requests after 20307be8da07SAndreas Gruenbacher * the new peer request has completed. 20317be8da07SAndreas Gruenbacher */ 20327be8da07SAndreas Gruenbacher peer_req->flags |= EE_RESTART_REQUESTS; 20337be8da07SAndreas Gruenbacher } 20347be8da07SAndreas Gruenbacher } 20357be8da07SAndreas Gruenbacher err = 0; 20367be8da07SAndreas Gruenbacher 20377be8da07SAndreas Gruenbacher out: 20387be8da07SAndreas Gruenbacher if (err) 20397be8da07SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 20407be8da07SAndreas Gruenbacher return err; 20417be8da07SAndreas Gruenbacher } 20427be8da07SAndreas Gruenbacher 2043b411b363SPhilipp Reisner /* mirrored write */ 20444a76b161SAndreas Gruenbacher static int receive_Data(struct drbd_tconn *tconn, struct packet_info *pi) 2045b411b363SPhilipp Reisner { 20464a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2047b411b363SPhilipp Reisner sector_t sector; 2048db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2049e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 20507be8da07SAndreas Gruenbacher u32 peer_seq = be32_to_cpu(p->seq_num); 2051b411b363SPhilipp Reisner int rw = WRITE; 2052b411b363SPhilipp Reisner u32 dp_flags; 2053302bdeaeSPhilipp Reisner int err, tp; 20547be8da07SAndreas Gruenbacher 20554a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 20564a76b161SAndreas Gruenbacher if (!mdev) 20574a76b161SAndreas Gruenbacher return -EIO; 20584a76b161SAndreas Gruenbacher 2059b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 206082bc0194SAndreas Gruenbacher int err2; 206182bc0194SAndreas Gruenbacher 20627be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 2063e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 2064b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 2065e2857216SAndreas Gruenbacher err2 = drbd_drain_block(mdev, pi->size); 206682bc0194SAndreas Gruenbacher if (!err) 206782bc0194SAndreas Gruenbacher err = err2; 206882bc0194SAndreas Gruenbacher return err; 2069b411b363SPhilipp Reisner } 2070b411b363SPhilipp Reisner 2071fcefa62eSAndreas Gruenbacher /* 2072fcefa62eSAndreas Gruenbacher * Corresponding put_ldev done either below (on various errors), or in 2073fcefa62eSAndreas Gruenbacher * drbd_peer_request_endio, if we successfully submit the data at the 2074fcefa62eSAndreas Gruenbacher * end of this function. 2075fcefa62eSAndreas Gruenbacher */ 2076b411b363SPhilipp Reisner 2077b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2078e2857216SAndreas Gruenbacher peer_req = read_in_block(mdev, p->block_id, sector, pi->size); 2079db830c46SAndreas Gruenbacher if (!peer_req) { 2080b411b363SPhilipp Reisner put_ldev(mdev); 208182bc0194SAndreas Gruenbacher return -EIO; 2082b411b363SPhilipp Reisner } 2083b411b363SPhilipp Reisner 2084db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_block; 2085b411b363SPhilipp Reisner 2086688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 2087688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 2088688593c5SLars Ellenberg 2089688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 2090db830c46SAndreas Gruenbacher peer_req->flags |= EE_MAY_SET_IN_SYNC; 2091688593c5SLars Ellenberg 2092b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 2093db830c46SAndreas Gruenbacher peer_req->epoch = mdev->current_epoch; 2094db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->epoch_size); 2095db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->active); 2096b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 2097b411b363SPhilipp Reisner 2098302bdeaeSPhilipp Reisner rcu_read_lock(); 2099302bdeaeSPhilipp Reisner tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; 2100302bdeaeSPhilipp Reisner rcu_read_unlock(); 2101302bdeaeSPhilipp Reisner if (tp) { 2102302bdeaeSPhilipp Reisner peer_req->flags |= EE_IN_INTERVAL_TREE; 21037be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 21047be8da07SAndreas Gruenbacher if (err) 2105b411b363SPhilipp Reisner goto out_interrupted; 210687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 21077be8da07SAndreas Gruenbacher err = handle_write_conflicts(mdev, peer_req); 21087be8da07SAndreas Gruenbacher if (err) { 210987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 21107be8da07SAndreas Gruenbacher if (err == -ENOENT) { 2111b411b363SPhilipp Reisner put_ldev(mdev); 211282bc0194SAndreas Gruenbacher return 0; 2113b411b363SPhilipp Reisner } 2114b411b363SPhilipp Reisner goto out_interrupted; 2115b411b363SPhilipp Reisner } 21167be8da07SAndreas Gruenbacher } else 211787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2118db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->active_ee); 211987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2120b411b363SPhilipp Reisner 2121303d1448SPhilipp Reisner if (mdev->tconn->agreed_pro_version < 100) { 212244ed167dSPhilipp Reisner rcu_read_lock(); 212344ed167dSPhilipp Reisner switch (rcu_dereference(mdev->tconn->net_conf)->wire_protocol) { 2124b411b363SPhilipp Reisner case DRBD_PROT_C: 2125303d1448SPhilipp Reisner dp_flags |= DP_SEND_WRITE_ACK; 2126303d1448SPhilipp Reisner break; 2127303d1448SPhilipp Reisner case DRBD_PROT_B: 2128303d1448SPhilipp Reisner dp_flags |= DP_SEND_RECEIVE_ACK; 2129303d1448SPhilipp Reisner break; 2130303d1448SPhilipp Reisner } 213144ed167dSPhilipp Reisner rcu_read_unlock(); 2132303d1448SPhilipp Reisner } 2133303d1448SPhilipp Reisner 2134303d1448SPhilipp Reisner if (dp_flags & DP_SEND_WRITE_ACK) { 2135303d1448SPhilipp Reisner peer_req->flags |= EE_SEND_WRITE_ACK; 2136b411b363SPhilipp Reisner inc_unacked(mdev); 2137b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 2138b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 2139303d1448SPhilipp Reisner } 2140303d1448SPhilipp Reisner 2141303d1448SPhilipp Reisner if (dp_flags & DP_SEND_RECEIVE_ACK) { 2142b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 2143b411b363SPhilipp Reisner * sends on the msock, but anyways */ 2144db830c46SAndreas Gruenbacher drbd_send_ack(mdev, P_RECV_ACK, peer_req); 2145b411b363SPhilipp Reisner } 2146b411b363SPhilipp Reisner 21476719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 2148b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 2149db830c46SAndreas Gruenbacher drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); 2150db830c46SAndreas Gruenbacher peer_req->flags |= EE_CALL_AL_COMPLETE_IO; 2151db830c46SAndreas Gruenbacher peer_req->flags &= ~EE_MAY_SET_IN_SYNC; 2152181286adSLars Ellenberg drbd_al_begin_io(mdev, &peer_req->i); 2153b411b363SPhilipp Reisner } 2154b411b363SPhilipp Reisner 215582bc0194SAndreas Gruenbacher err = drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR); 215682bc0194SAndreas Gruenbacher if (!err) 215782bc0194SAndreas Gruenbacher return 0; 2158b411b363SPhilipp Reisner 215910f6d992SLars Ellenberg /* don't care for the reason here */ 216010f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 216187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2162db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 2163db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 216487eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2165db830c46SAndreas Gruenbacher if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) 2166181286adSLars Ellenberg drbd_al_complete_io(mdev, &peer_req->i); 216722cc37a9SLars Ellenberg 2168b411b363SPhilipp Reisner out_interrupted: 2169db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + EV_CLEANUP); 2170b411b363SPhilipp Reisner put_ldev(mdev); 21713967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 217282bc0194SAndreas Gruenbacher return err; 2173b411b363SPhilipp Reisner } 2174b411b363SPhilipp Reisner 21750f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 21760f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 21770f0601f4SLars Ellenberg * 21780f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 21790f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 21800f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 21810f0601f4SLars Ellenberg * activity, it obviously is "busy". 21820f0601f4SLars Ellenberg * 21830f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 21840f0601f4SLars Ellenberg * to have a short time average so we can react faster. 21850f0601f4SLars Ellenberg */ 2186e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 21870f0601f4SLars Ellenberg { 21880f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 21890f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 2190e3555d85SPhilipp Reisner struct lc_element *tmp; 21910f0601f4SLars Ellenberg int curr_events; 21920f0601f4SLars Ellenberg int throttle = 0; 21930f0601f4SLars Ellenberg 21940f0601f4SLars Ellenberg /* feature disabled? */ 2195f399002eSLars Ellenberg if (mdev->ldev->dc.c_min_rate == 0) 21960f0601f4SLars Ellenberg return 0; 21970f0601f4SLars Ellenberg 2198e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 2199e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 2200e3555d85SPhilipp Reisner if (tmp) { 2201e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 2202e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 2203e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2204e3555d85SPhilipp Reisner return 0; 2205e3555d85SPhilipp Reisner } 2206e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 2207e3555d85SPhilipp Reisner } 2208e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2209e3555d85SPhilipp Reisner 22100f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 22110f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 22120f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 2213e3555d85SPhilipp Reisner 22140f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 22150f0601f4SLars Ellenberg unsigned long rs_left; 22160f0601f4SLars Ellenberg int i; 22170f0601f4SLars Ellenberg 22180f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 22190f0601f4SLars Ellenberg 22200f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 22210f0601f4SLars Ellenberg * approx. */ 22222649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 22232649f080SLars Ellenberg 22242649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 22252649f080SLars Ellenberg rs_left = mdev->ov_left; 22262649f080SLars Ellenberg else 22270f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 22280f0601f4SLars Ellenberg 22290f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 22300f0601f4SLars Ellenberg if (!dt) 22310f0601f4SLars Ellenberg dt++; 22320f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 22330f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 22340f0601f4SLars Ellenberg 2235f399002eSLars Ellenberg if (dbdt > mdev->ldev->dc.c_min_rate) 22360f0601f4SLars Ellenberg throttle = 1; 22370f0601f4SLars Ellenberg } 22380f0601f4SLars Ellenberg return throttle; 22390f0601f4SLars Ellenberg } 22400f0601f4SLars Ellenberg 22410f0601f4SLars Ellenberg 22424a76b161SAndreas Gruenbacher static int receive_DataRequest(struct drbd_tconn *tconn, struct packet_info *pi) 2243b411b363SPhilipp Reisner { 22444a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2245b411b363SPhilipp Reisner sector_t sector; 22464a76b161SAndreas Gruenbacher sector_t capacity; 2247db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2248b411b363SPhilipp Reisner struct digest_info *di = NULL; 2249b18b37beSPhilipp Reisner int size, verb; 2250b411b363SPhilipp Reisner unsigned int fault_type; 2251e658983aSAndreas Gruenbacher struct p_block_req *p = pi->data; 22524a76b161SAndreas Gruenbacher 22534a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 22544a76b161SAndreas Gruenbacher if (!mdev) 22554a76b161SAndreas Gruenbacher return -EIO; 22564a76b161SAndreas Gruenbacher capacity = drbd_get_capacity(mdev->this_bdev); 2257b411b363SPhilipp Reisner 2258b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2259b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2260b411b363SPhilipp Reisner 2261c670a398SAndreas Gruenbacher if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { 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 if (sector + (size>>9) > capacity) { 2267b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2268b411b363SPhilipp Reisner (unsigned long long)sector, size); 226982bc0194SAndreas Gruenbacher return -EINVAL; 2270b411b363SPhilipp Reisner } 2271b411b363SPhilipp Reisner 2272b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 2273b18b37beSPhilipp Reisner verb = 1; 2274e2857216SAndreas Gruenbacher switch (pi->cmd) { 2275b18b37beSPhilipp Reisner case P_DATA_REQUEST: 2276b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 2277b18b37beSPhilipp Reisner break; 2278b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2279b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2280b18b37beSPhilipp Reisner case P_OV_REQUEST: 2281b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 2282b18b37beSPhilipp Reisner break; 2283b18b37beSPhilipp Reisner case P_OV_REPLY: 2284b18b37beSPhilipp Reisner verb = 0; 2285b18b37beSPhilipp Reisner dec_rs_pending(mdev); 2286b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 2287b18b37beSPhilipp Reisner break; 2288b18b37beSPhilipp Reisner default: 228949ba9b1bSAndreas Gruenbacher BUG(); 2290b18b37beSPhilipp Reisner } 2291b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2292b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2293b411b363SPhilipp Reisner "no local data.\n"); 2294b18b37beSPhilipp Reisner 2295a821cc4aSLars Ellenberg /* drain possibly payload */ 2296e2857216SAndreas Gruenbacher return drbd_drain_block(mdev, pi->size); 2297b411b363SPhilipp Reisner } 2298b411b363SPhilipp Reisner 2299b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2300b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2301b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 23020db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, p->block_id, sector, size, GFP_NOIO); 2303db830c46SAndreas Gruenbacher if (!peer_req) { 2304b411b363SPhilipp Reisner put_ldev(mdev); 230582bc0194SAndreas Gruenbacher return -ENOMEM; 2306b411b363SPhilipp Reisner } 2307b411b363SPhilipp Reisner 2308e2857216SAndreas Gruenbacher switch (pi->cmd) { 2309b411b363SPhilipp Reisner case P_DATA_REQUEST: 2310db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_data_req; 2311b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 231280a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 231380a40e43SLars Ellenberg goto submit; 231480a40e43SLars Ellenberg 2315b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2316db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_rsdata_req; 2317b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 23185f9915bbSLars Ellenberg /* used in the sector offset progress display */ 23195f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2320b411b363SPhilipp Reisner break; 2321b411b363SPhilipp Reisner 2322b411b363SPhilipp Reisner case P_OV_REPLY: 2323b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2324b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2325e2857216SAndreas Gruenbacher di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); 2326b411b363SPhilipp Reisner if (!di) 2327b411b363SPhilipp Reisner goto out_free_e; 2328b411b363SPhilipp Reisner 2329e2857216SAndreas Gruenbacher di->digest_size = pi->size; 2330b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2331b411b363SPhilipp Reisner 2332db830c46SAndreas Gruenbacher peer_req->digest = di; 2333db830c46SAndreas Gruenbacher peer_req->flags |= EE_HAS_DIGEST; 2334c36c3cedSLars Ellenberg 2335e2857216SAndreas Gruenbacher if (drbd_recv_all(mdev->tconn, di->digest, pi->size)) 2336b411b363SPhilipp Reisner goto out_free_e; 2337b411b363SPhilipp Reisner 2338e2857216SAndreas Gruenbacher if (pi->cmd == P_CSUM_RS_REQUEST) { 233931890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 2340db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_csum_rs_req; 23415f9915bbSLars Ellenberg /* used in the sector offset progress display */ 23425f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2343e2857216SAndreas Gruenbacher } else if (pi->cmd == P_OV_REPLY) { 23442649f080SLars Ellenberg /* track progress, we may need to throttle */ 23452649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2346db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_reply; 2347b411b363SPhilipp Reisner dec_rs_pending(mdev); 23480f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 23490f0601f4SLars Ellenberg * but accounting still needs to be done. */ 23500f0601f4SLars Ellenberg goto submit_for_resync; 2351b411b363SPhilipp Reisner } 2352b411b363SPhilipp Reisner break; 2353b411b363SPhilipp Reisner 2354b411b363SPhilipp Reisner case P_OV_REQUEST: 2355b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 235631890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90) { 2357de228bbaSLars Ellenberg unsigned long now = jiffies; 2358de228bbaSLars Ellenberg int i; 2359b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2360b411b363SPhilipp Reisner mdev->ov_position = sector; 236130b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 236230b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2363de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2364de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2365de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2366de228bbaSLars Ellenberg } 2367b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2368b411b363SPhilipp Reisner (unsigned long long)sector); 2369b411b363SPhilipp Reisner } 2370db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_req; 2371b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2372b411b363SPhilipp Reisner break; 2373b411b363SPhilipp Reisner 2374b411b363SPhilipp Reisner default: 237549ba9b1bSAndreas Gruenbacher BUG(); 2376b411b363SPhilipp Reisner } 2377b411b363SPhilipp Reisner 23780f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 23790f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 23800f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 23810f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 23820f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 23830f0601f4SLars Ellenberg * 23840f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 23850f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 23860f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 23870f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 23880f0601f4SLars Ellenberg * a while, anyways. 23890f0601f4SLars Ellenberg */ 2390b411b363SPhilipp Reisner 23910f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 23920f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 23930f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 23940f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 23950f0601f4SLars Ellenberg * 23960f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 23970f0601f4SLars Ellenberg * we would also throttle its application reads. 23980f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 23990f0601f4SLars Ellenberg */ 2400e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2401e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2402e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 240380a40e43SLars Ellenberg goto out_free_e; 2404b411b363SPhilipp Reisner 24050f0601f4SLars Ellenberg submit_for_resync: 24060f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 24070f0601f4SLars Ellenberg 240880a40e43SLars Ellenberg submit: 2409b411b363SPhilipp Reisner inc_unacked(mdev); 241087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2411db830c46SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->read_ee); 241287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2413b411b363SPhilipp Reisner 2414fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0) 241582bc0194SAndreas Gruenbacher return 0; 2416b411b363SPhilipp Reisner 241710f6d992SLars Ellenberg /* don't care for the reason here */ 241810f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 241987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2420db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 242187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 242222cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 242322cc37a9SLars Ellenberg 2424b411b363SPhilipp Reisner out_free_e: 2425b411b363SPhilipp Reisner put_ldev(mdev); 24263967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 242782bc0194SAndreas Gruenbacher return -EIO; 2428b411b363SPhilipp Reisner } 2429b411b363SPhilipp Reisner 2430b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2431b411b363SPhilipp Reisner { 2432b411b363SPhilipp Reisner int self, peer, rv = -100; 2433b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 243444ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_0p; 2435b411b363SPhilipp Reisner 2436b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2437b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2438b411b363SPhilipp Reisner 2439b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2440b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2441b411b363SPhilipp Reisner 244244ed167dSPhilipp Reisner rcu_read_lock(); 244344ed167dSPhilipp Reisner after_sb_0p = rcu_dereference(mdev->tconn->net_conf)->after_sb_0p; 244444ed167dSPhilipp Reisner rcu_read_unlock(); 244544ed167dSPhilipp Reisner switch (after_sb_0p) { 2446b411b363SPhilipp Reisner case ASB_CONSENSUS: 2447b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2448b411b363SPhilipp Reisner case ASB_CALL_HELPER: 244944ed167dSPhilipp Reisner case ASB_VIOLENTLY: 2450b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2451b411b363SPhilipp Reisner break; 2452b411b363SPhilipp Reisner case ASB_DISCONNECT: 2453b411b363SPhilipp Reisner break; 2454b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2455b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2456b411b363SPhilipp Reisner rv = -1; 2457b411b363SPhilipp Reisner break; 2458b411b363SPhilipp Reisner } 2459b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2460b411b363SPhilipp Reisner rv = 1; 2461b411b363SPhilipp Reisner break; 2462b411b363SPhilipp Reisner } 2463b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2464b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2465b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2466b411b363SPhilipp Reisner rv = 1; 2467b411b363SPhilipp Reisner break; 2468b411b363SPhilipp Reisner } 2469b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2470b411b363SPhilipp Reisner rv = -1; 2471b411b363SPhilipp Reisner break; 2472b411b363SPhilipp Reisner } 2473b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2474ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2475b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2476b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2477b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 247825703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2479b411b363SPhilipp Reisner ? -1 : 1; 2480b411b363SPhilipp Reisner break; 2481b411b363SPhilipp Reisner } else { 2482b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2483b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2484b411b363SPhilipp Reisner } 248544ed167dSPhilipp Reisner if (after_sb_0p == ASB_DISCARD_ZERO_CHG) 2486b411b363SPhilipp Reisner break; 2487b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2488b411b363SPhilipp Reisner if (ch_self < ch_peer) 2489b411b363SPhilipp Reisner rv = -1; 2490b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2491b411b363SPhilipp Reisner rv = 1; 2492b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2493b411b363SPhilipp Reisner /* Well, then use something else. */ 249425703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2495b411b363SPhilipp Reisner ? -1 : 1; 2496b411b363SPhilipp Reisner break; 2497b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2498b411b363SPhilipp Reisner rv = -1; 2499b411b363SPhilipp Reisner break; 2500b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2501b411b363SPhilipp Reisner rv = 1; 2502b411b363SPhilipp Reisner } 2503b411b363SPhilipp Reisner 2504b411b363SPhilipp Reisner return rv; 2505b411b363SPhilipp Reisner } 2506b411b363SPhilipp Reisner 2507b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2508b411b363SPhilipp Reisner { 25096184ea21SAndreas Gruenbacher int hg, rv = -100; 251044ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_1p; 2511b411b363SPhilipp Reisner 251244ed167dSPhilipp Reisner rcu_read_lock(); 251344ed167dSPhilipp Reisner after_sb_1p = rcu_dereference(mdev->tconn->net_conf)->after_sb_1p; 251444ed167dSPhilipp Reisner rcu_read_unlock(); 251544ed167dSPhilipp Reisner switch (after_sb_1p) { 2516b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2517b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2518b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2519b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2520b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 252144ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2522b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2523b411b363SPhilipp Reisner break; 2524b411b363SPhilipp Reisner case ASB_DISCONNECT: 2525b411b363SPhilipp Reisner break; 2526b411b363SPhilipp Reisner case ASB_CONSENSUS: 2527b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2528b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2529b411b363SPhilipp Reisner rv = hg; 2530b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2531b411b363SPhilipp Reisner rv = hg; 2532b411b363SPhilipp Reisner break; 2533b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2534b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2535b411b363SPhilipp Reisner break; 2536b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2537b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2538b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2539b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2540b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2541bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2542bb437946SAndreas Gruenbacher 2543bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2544b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2545b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2546b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2547bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2548bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2549b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2550b411b363SPhilipp Reisner } else { 2551b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2552b411b363SPhilipp Reisner rv = hg; 2553b411b363SPhilipp Reisner } 2554b411b363SPhilipp Reisner } else 2555b411b363SPhilipp Reisner rv = hg; 2556b411b363SPhilipp Reisner } 2557b411b363SPhilipp Reisner 2558b411b363SPhilipp Reisner return rv; 2559b411b363SPhilipp Reisner } 2560b411b363SPhilipp Reisner 2561b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2562b411b363SPhilipp Reisner { 25636184ea21SAndreas Gruenbacher int hg, rv = -100; 256444ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_2p; 2565b411b363SPhilipp Reisner 256644ed167dSPhilipp Reisner rcu_read_lock(); 256744ed167dSPhilipp Reisner after_sb_2p = rcu_dereference(mdev->tconn->net_conf)->after_sb_2p; 256844ed167dSPhilipp Reisner rcu_read_unlock(); 256944ed167dSPhilipp Reisner switch (after_sb_2p) { 2570b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2571b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2572b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2573b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2574b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2575b411b363SPhilipp Reisner case ASB_CONSENSUS: 2576b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 257744ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2578b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2579b411b363SPhilipp Reisner break; 2580b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2581b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2582b411b363SPhilipp Reisner break; 2583b411b363SPhilipp Reisner case ASB_DISCONNECT: 2584b411b363SPhilipp Reisner break; 2585b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2586b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2587b411b363SPhilipp Reisner if (hg == -1) { 2588bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2589bb437946SAndreas Gruenbacher 2590b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2591b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2592b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2593bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2594bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2595b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2596b411b363SPhilipp Reisner } else { 2597b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2598b411b363SPhilipp Reisner rv = hg; 2599b411b363SPhilipp Reisner } 2600b411b363SPhilipp Reisner } else 2601b411b363SPhilipp Reisner rv = hg; 2602b411b363SPhilipp Reisner } 2603b411b363SPhilipp Reisner 2604b411b363SPhilipp Reisner return rv; 2605b411b363SPhilipp Reisner } 2606b411b363SPhilipp Reisner 2607b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2608b411b363SPhilipp Reisner u64 bits, u64 flags) 2609b411b363SPhilipp Reisner { 2610b411b363SPhilipp Reisner if (!uuid) { 2611b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2612b411b363SPhilipp Reisner return; 2613b411b363SPhilipp Reisner } 2614b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2615b411b363SPhilipp Reisner text, 2616b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2617b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2618b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2619b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2620b411b363SPhilipp Reisner (unsigned long long)bits, 2621b411b363SPhilipp Reisner (unsigned long long)flags); 2622b411b363SPhilipp Reisner } 2623b411b363SPhilipp Reisner 2624b411b363SPhilipp Reisner /* 2625b411b363SPhilipp Reisner 100 after split brain try auto recover 2626b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2627b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2628b411b363SPhilipp Reisner 0 no Sync 2629b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2630b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2631b411b363SPhilipp Reisner -100 after split brain, disconnect 2632b411b363SPhilipp Reisner -1000 unrelated data 26334a23f264SPhilipp Reisner -1091 requires proto 91 26344a23f264SPhilipp Reisner -1096 requires proto 96 2635b411b363SPhilipp Reisner */ 2636b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2637b411b363SPhilipp Reisner { 2638b411b363SPhilipp Reisner u64 self, peer; 2639b411b363SPhilipp Reisner int i, j; 2640b411b363SPhilipp Reisner 2641b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2642b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2643b411b363SPhilipp Reisner 2644b411b363SPhilipp Reisner *rule_nr = 10; 2645b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2646b411b363SPhilipp Reisner return 0; 2647b411b363SPhilipp Reisner 2648b411b363SPhilipp Reisner *rule_nr = 20; 2649b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2650b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2651b411b363SPhilipp Reisner return -2; 2652b411b363SPhilipp Reisner 2653b411b363SPhilipp Reisner *rule_nr = 30; 2654b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2655b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2656b411b363SPhilipp Reisner return 2; 2657b411b363SPhilipp Reisner 2658b411b363SPhilipp Reisner if (self == peer) { 2659b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2660b411b363SPhilipp Reisner 2661b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2662b411b363SPhilipp Reisner 266331890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 26644a23f264SPhilipp Reisner return -1091; 2665b411b363SPhilipp Reisner 2666b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2667b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2668b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2669b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2670b411b363SPhilipp Reisner 2671b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2672b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2673b411b363SPhilipp Reisner *rule_nr = 34; 2674b411b363SPhilipp Reisner } else { 2675b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2676b411b363SPhilipp Reisner *rule_nr = 36; 2677b411b363SPhilipp Reisner } 2678b411b363SPhilipp Reisner 2679b411b363SPhilipp Reisner return 1; 2680b411b363SPhilipp Reisner } 2681b411b363SPhilipp Reisner 2682b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2683b411b363SPhilipp Reisner 268431890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 26854a23f264SPhilipp Reisner return -1091; 2686b411b363SPhilipp Reisner 2687b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2688b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2689b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2690b411b363SPhilipp Reisner 2691b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2692b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2693b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2694b411b363SPhilipp Reisner 2695b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2696b411b363SPhilipp Reisner *rule_nr = 35; 2697b411b363SPhilipp Reisner } else { 2698b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2699b411b363SPhilipp Reisner *rule_nr = 37; 2700b411b363SPhilipp Reisner } 2701b411b363SPhilipp Reisner 2702b411b363SPhilipp Reisner return -1; 2703b411b363SPhilipp Reisner } 2704b411b363SPhilipp Reisner 2705b411b363SPhilipp Reisner /* Common power [off|failure] */ 2706b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2707b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2708b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2709b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2710b411b363SPhilipp Reisner *rule_nr = 40; 2711b411b363SPhilipp Reisner 2712b411b363SPhilipp Reisner switch (rct) { 2713b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2714b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2715b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2716b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 271725703f83SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 2718b411b363SPhilipp Reisner return dc ? -1 : 1; 2719b411b363SPhilipp Reisner } 2720b411b363SPhilipp Reisner } 2721b411b363SPhilipp Reisner 2722b411b363SPhilipp Reisner *rule_nr = 50; 2723b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2724b411b363SPhilipp Reisner if (self == peer) 2725b411b363SPhilipp Reisner return -1; 2726b411b363SPhilipp Reisner 2727b411b363SPhilipp Reisner *rule_nr = 51; 2728b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2729b411b363SPhilipp Reisner if (self == peer) { 273031890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 27314a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 27324a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 27334a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2734b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2735b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2736b411b363SPhilipp Reisner 273731890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27384a23f264SPhilipp Reisner return -1091; 2739b411b363SPhilipp Reisner 2740b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2741b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 27424a23f264SPhilipp Reisner 27434a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 27444a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 27454a23f264SPhilipp Reisner 2746b411b363SPhilipp Reisner return -1; 2747b411b363SPhilipp Reisner } 2748b411b363SPhilipp Reisner } 2749b411b363SPhilipp Reisner 2750b411b363SPhilipp Reisner *rule_nr = 60; 2751b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2752b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2753b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2754b411b363SPhilipp Reisner if (self == peer) 2755b411b363SPhilipp Reisner return -2; 2756b411b363SPhilipp Reisner } 2757b411b363SPhilipp Reisner 2758b411b363SPhilipp Reisner *rule_nr = 70; 2759b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2760b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2761b411b363SPhilipp Reisner if (self == peer) 2762b411b363SPhilipp Reisner return 1; 2763b411b363SPhilipp Reisner 2764b411b363SPhilipp Reisner *rule_nr = 71; 2765b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2766b411b363SPhilipp Reisner if (self == peer) { 276731890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 27684a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 27694a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 27704a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2771b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2772b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2773b411b363SPhilipp Reisner 277431890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27754a23f264SPhilipp Reisner return -1091; 2776b411b363SPhilipp Reisner 2777b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2778b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2779b411b363SPhilipp Reisner 27804a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2781b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2782b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2783b411b363SPhilipp Reisner 2784b411b363SPhilipp Reisner return 1; 2785b411b363SPhilipp Reisner } 2786b411b363SPhilipp Reisner } 2787b411b363SPhilipp Reisner 2788b411b363SPhilipp Reisner 2789b411b363SPhilipp Reisner *rule_nr = 80; 2790d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2791b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2792b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2793b411b363SPhilipp Reisner if (self == peer) 2794b411b363SPhilipp Reisner return 2; 2795b411b363SPhilipp Reisner } 2796b411b363SPhilipp Reisner 2797b411b363SPhilipp Reisner *rule_nr = 90; 2798b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2799b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2800b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2801b411b363SPhilipp Reisner return 100; 2802b411b363SPhilipp Reisner 2803b411b363SPhilipp Reisner *rule_nr = 100; 2804b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2805b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2806b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2807b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2808b411b363SPhilipp Reisner if (self == peer) 2809b411b363SPhilipp Reisner return -100; 2810b411b363SPhilipp Reisner } 2811b411b363SPhilipp Reisner } 2812b411b363SPhilipp Reisner 2813b411b363SPhilipp Reisner return -1000; 2814b411b363SPhilipp Reisner } 2815b411b363SPhilipp Reisner 2816b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2817b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2818b411b363SPhilipp Reisner */ 2819b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2820b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2821b411b363SPhilipp Reisner { 2822b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2823b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 282444ed167dSPhilipp Reisner struct net_conf *nc; 282544ed167dSPhilipp Reisner int hg, rule_nr, rr_conflict, dry_run; 2826b411b363SPhilipp Reisner 2827b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2828b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2829b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2830b411b363SPhilipp Reisner 2831b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2832b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2833b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2834b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2835b411b363SPhilipp Reisner 2836b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2837b411b363SPhilipp Reisner 2838b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2839b411b363SPhilipp Reisner 2840b411b363SPhilipp Reisner if (hg == -1000) { 2841b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2842b411b363SPhilipp Reisner return C_MASK; 2843b411b363SPhilipp Reisner } 28444a23f264SPhilipp Reisner if (hg < -1000) { 28454a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2846b411b363SPhilipp Reisner return C_MASK; 2847b411b363SPhilipp Reisner } 2848b411b363SPhilipp Reisner 2849b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2850b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2851b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2852b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2853b411b363SPhilipp Reisner if (f) 2854b411b363SPhilipp Reisner hg = hg*2; 2855b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2856b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2857b411b363SPhilipp Reisner } 2858b411b363SPhilipp Reisner 28593a11a487SAdam Gandelman if (abs(hg) == 100) 28603a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 28613a11a487SAdam Gandelman 286244ed167dSPhilipp Reisner rcu_read_lock(); 286344ed167dSPhilipp Reisner nc = rcu_dereference(mdev->tconn->net_conf); 286444ed167dSPhilipp Reisner 286544ed167dSPhilipp Reisner if (hg == 100 || (hg == -100 && nc->always_asbp)) { 2866b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2867b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2868b411b363SPhilipp Reisner int forced = (hg == -100); 2869b411b363SPhilipp Reisner 2870b411b363SPhilipp Reisner switch (pcount) { 2871b411b363SPhilipp Reisner case 0: 2872b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2873b411b363SPhilipp Reisner break; 2874b411b363SPhilipp Reisner case 1: 2875b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2876b411b363SPhilipp Reisner break; 2877b411b363SPhilipp Reisner case 2: 2878b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2879b411b363SPhilipp Reisner break; 2880b411b363SPhilipp Reisner } 2881b411b363SPhilipp Reisner if (abs(hg) < 100) { 2882b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2883b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2884b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2885b411b363SPhilipp Reisner if (forced) { 2886b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2887b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2888b411b363SPhilipp Reisner hg = hg*2; 2889b411b363SPhilipp Reisner } 2890b411b363SPhilipp Reisner } 2891b411b363SPhilipp Reisner } 2892b411b363SPhilipp Reisner 2893b411b363SPhilipp Reisner if (hg == -100) { 289444ed167dSPhilipp Reisner if (nc->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2895b411b363SPhilipp Reisner hg = -1; 289644ed167dSPhilipp Reisner if (!nc->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2897b411b363SPhilipp Reisner hg = 1; 2898b411b363SPhilipp Reisner 2899b411b363SPhilipp Reisner if (abs(hg) < 100) 2900b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2901b411b363SPhilipp Reisner "Sync from %s node\n", 2902b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2903b411b363SPhilipp Reisner } 290444ed167dSPhilipp Reisner rr_conflict = nc->rr_conflict; 290544ed167dSPhilipp Reisner dry_run = nc->dry_run; 290644ed167dSPhilipp Reisner rcu_read_unlock(); 2907b411b363SPhilipp Reisner 2908b411b363SPhilipp Reisner if (hg == -100) { 2909580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2910580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2911580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2912580b9767SLars Ellenberg * to that disk, in a way... */ 29133a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2914b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2915b411b363SPhilipp Reisner return C_MASK; 2916b411b363SPhilipp Reisner } 2917b411b363SPhilipp Reisner 2918b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2919b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2920b411b363SPhilipp Reisner return C_MASK; 2921b411b363SPhilipp Reisner } 2922b411b363SPhilipp Reisner 2923b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2924b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 292544ed167dSPhilipp Reisner switch (rr_conflict) { 2926b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2927b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2928b411b363SPhilipp Reisner /* fall through */ 2929b411b363SPhilipp Reisner case ASB_DISCONNECT: 2930b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2931b411b363SPhilipp Reisner return C_MASK; 2932b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2933b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2934b411b363SPhilipp Reisner "assumption\n"); 2935b411b363SPhilipp Reisner } 2936b411b363SPhilipp Reisner } 2937b411b363SPhilipp Reisner 293844ed167dSPhilipp Reisner if (dry_run || test_bit(CONN_DRY_RUN, &mdev->tconn->flags)) { 2939cf14c2e9SPhilipp Reisner if (hg == 0) 2940cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2941cf14c2e9SPhilipp Reisner else 2942cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2943cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2944cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2945cf14c2e9SPhilipp Reisner return C_MASK; 2946cf14c2e9SPhilipp Reisner } 2947cf14c2e9SPhilipp Reisner 2948b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2949b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 295020ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 295120ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 2952b411b363SPhilipp Reisner return C_MASK; 2953b411b363SPhilipp Reisner } 2954b411b363SPhilipp Reisner 2955b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2956b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2957b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2958b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2959b411b363SPhilipp Reisner } else { 2960b411b363SPhilipp Reisner rv = C_CONNECTED; 2961b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2962b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2963b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2964b411b363SPhilipp Reisner } 2965b411b363SPhilipp Reisner } 2966b411b363SPhilipp Reisner 2967b411b363SPhilipp Reisner return rv; 2968b411b363SPhilipp Reisner } 2969b411b363SPhilipp Reisner 2970b411b363SPhilipp Reisner /* returns 1 if invalid */ 2971b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2972b411b363SPhilipp Reisner { 2973b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2974b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2975b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2976b411b363SPhilipp Reisner return 0; 2977b411b363SPhilipp Reisner 2978b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2979b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2980b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2981b411b363SPhilipp Reisner return 1; 2982b411b363SPhilipp Reisner 2983b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2984b411b363SPhilipp Reisner if (peer == self) 2985b411b363SPhilipp Reisner return 0; 2986b411b363SPhilipp Reisner 2987b411b363SPhilipp Reisner /* everything es is invalid. */ 2988b411b363SPhilipp Reisner return 1; 2989b411b363SPhilipp Reisner } 2990b411b363SPhilipp Reisner 2991e2857216SAndreas Gruenbacher static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi) 2992b411b363SPhilipp Reisner { 2993e658983aSAndreas Gruenbacher struct p_protocol *p = pi->data; 2994b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2995cf14c2e9SPhilipp Reisner int p_want_lose, p_two_primaries, cf; 299644ed167dSPhilipp Reisner struct net_conf *nc; 2997b411b363SPhilipp Reisner 2998b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2999b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 3000b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 3001b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 3002b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 3003cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 3004cf14c2e9SPhilipp Reisner p_want_lose = cf & CF_WANT_LOSE; 3005cf14c2e9SPhilipp Reisner 300686db0618SAndreas Gruenbacher if (tconn->agreed_pro_version >= 87) { 300788104ca4SAndreas Gruenbacher char integrity_alg[SHARED_SECRET_MAX]; 300888104ca4SAndreas Gruenbacher struct crypto_hash *tfm = NULL; 300986db0618SAndreas Gruenbacher int err; 301086db0618SAndreas Gruenbacher 301188104ca4SAndreas Gruenbacher if (pi->size > sizeof(integrity_alg)) 301286db0618SAndreas Gruenbacher return -EIO; 301388104ca4SAndreas Gruenbacher err = drbd_recv_all(tconn, integrity_alg, pi->size); 301486db0618SAndreas Gruenbacher if (err) 301586db0618SAndreas Gruenbacher return err; 301688104ca4SAndreas Gruenbacher integrity_alg[SHARED_SECRET_MAX-1] = 0; 301786db0618SAndreas Gruenbacher 301888104ca4SAndreas Gruenbacher if (integrity_alg[0]) { 301988104ca4SAndreas Gruenbacher tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC); 302088104ca4SAndreas Gruenbacher if (!tfm) { 302188104ca4SAndreas Gruenbacher conn_err(tconn, "peer data-integrity-alg %s not supported\n", 302288104ca4SAndreas Gruenbacher integrity_alg); 302388104ca4SAndreas Gruenbacher goto disconnect; 302488104ca4SAndreas Gruenbacher } 302588104ca4SAndreas Gruenbacher conn_info(tconn, "peer data-integrity-alg: %s\n", integrity_alg); 302688104ca4SAndreas Gruenbacher } 302788104ca4SAndreas Gruenbacher 302888104ca4SAndreas Gruenbacher if (tconn->peer_integrity_tfm) 302988104ca4SAndreas Gruenbacher crypto_free_hash(tconn->peer_integrity_tfm); 303088104ca4SAndreas Gruenbacher tconn->peer_integrity_tfm = tfm; 303186db0618SAndreas Gruenbacher } 303286db0618SAndreas Gruenbacher 30337204624cSPhilipp Reisner clear_bit(CONN_DRY_RUN, &tconn->flags); 3034cf14c2e9SPhilipp Reisner 3035cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 30367204624cSPhilipp Reisner set_bit(CONN_DRY_RUN, &tconn->flags); 3037b411b363SPhilipp Reisner 303844ed167dSPhilipp Reisner rcu_read_lock(); 303944ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 304044ed167dSPhilipp Reisner 304144ed167dSPhilipp Reisner if (p_proto != nc->wire_protocol && tconn->agreed_pro_version < 100) { 30427204624cSPhilipp Reisner conn_err(tconn, "incompatible communication protocols\n"); 304344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3044b411b363SPhilipp Reisner } 3045b411b363SPhilipp Reisner 304644ed167dSPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, nc->after_sb_0p)) { 30477204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-0pri settings\n"); 304844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3049b411b363SPhilipp Reisner } 3050b411b363SPhilipp Reisner 305144ed167dSPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, nc->after_sb_1p)) { 30527204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-1pri settings\n"); 305344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3054b411b363SPhilipp Reisner } 3055b411b363SPhilipp Reisner 305644ed167dSPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, nc->after_sb_2p)) { 30577204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-2pri settings\n"); 305844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3059b411b363SPhilipp Reisner } 3060b411b363SPhilipp Reisner 306144ed167dSPhilipp Reisner if (p_want_lose && nc->want_lose) { 30627204624cSPhilipp Reisner conn_err(tconn, "both sides have the 'want_lose' flag set\n"); 306344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3064b411b363SPhilipp Reisner } 3065b411b363SPhilipp Reisner 306644ed167dSPhilipp Reisner if (p_two_primaries != nc->two_primaries) { 30677204624cSPhilipp Reisner conn_err(tconn, "incompatible setting of the two-primaries options\n"); 306844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3069b411b363SPhilipp Reisner } 3070b411b363SPhilipp Reisner 307186db0618SAndreas Gruenbacher rcu_read_unlock(); 307286db0618SAndreas Gruenbacher 307382bc0194SAndreas Gruenbacher return 0; 3074b411b363SPhilipp Reisner 307544ed167dSPhilipp Reisner disconnect_rcu_unlock: 307644ed167dSPhilipp Reisner rcu_read_unlock(); 3077b411b363SPhilipp Reisner disconnect: 30787204624cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 307982bc0194SAndreas Gruenbacher return -EIO; 3080b411b363SPhilipp Reisner } 3081b411b363SPhilipp Reisner 3082b411b363SPhilipp Reisner /* helper function 3083b411b363SPhilipp Reisner * input: alg name, feature name 3084b411b363SPhilipp Reisner * return: NULL (alg name was "") 3085b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 3086b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 3087b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 3088b411b363SPhilipp Reisner const char *alg, const char *name) 3089b411b363SPhilipp Reisner { 3090b411b363SPhilipp Reisner struct crypto_hash *tfm; 3091b411b363SPhilipp Reisner 3092b411b363SPhilipp Reisner if (!alg[0]) 3093b411b363SPhilipp Reisner return NULL; 3094b411b363SPhilipp Reisner 3095b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 3096b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 3097b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 3098b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 3099b411b363SPhilipp Reisner return tfm; 3100b411b363SPhilipp Reisner } 3101b411b363SPhilipp Reisner return tfm; 3102b411b363SPhilipp Reisner } 3103b411b363SPhilipp Reisner 31044a76b161SAndreas Gruenbacher static int ignore_remaining_packet(struct drbd_tconn *tconn, struct packet_info *pi) 3105b411b363SPhilipp Reisner { 31064a76b161SAndreas Gruenbacher void *buffer = tconn->data.rbuf; 31074a76b161SAndreas Gruenbacher int size = pi->size; 31084a76b161SAndreas Gruenbacher 31094a76b161SAndreas Gruenbacher while (size) { 31104a76b161SAndreas Gruenbacher int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); 31114a76b161SAndreas Gruenbacher s = drbd_recv(tconn, buffer, s); 31124a76b161SAndreas Gruenbacher if (s <= 0) { 31134a76b161SAndreas Gruenbacher if (s < 0) 31144a76b161SAndreas Gruenbacher return s; 31154a76b161SAndreas Gruenbacher break; 31164a76b161SAndreas Gruenbacher } 31174a76b161SAndreas Gruenbacher size -= s; 31184a76b161SAndreas Gruenbacher } 31194a76b161SAndreas Gruenbacher if (size) 31204a76b161SAndreas Gruenbacher return -EIO; 31214a76b161SAndreas Gruenbacher return 0; 31224a76b161SAndreas Gruenbacher } 31234a76b161SAndreas Gruenbacher 31244a76b161SAndreas Gruenbacher /* 31254a76b161SAndreas Gruenbacher * config_unknown_volume - device configuration command for unknown volume 31264a76b161SAndreas Gruenbacher * 31274a76b161SAndreas Gruenbacher * When a device is added to an existing connection, the node on which the 31284a76b161SAndreas Gruenbacher * device is added first will send configuration commands to its peer but the 31294a76b161SAndreas Gruenbacher * peer will not know about the device yet. It will warn and ignore these 31304a76b161SAndreas Gruenbacher * commands. Once the device is added on the second node, the second node will 31314a76b161SAndreas Gruenbacher * send the same device configuration commands, but in the other direction. 31324a76b161SAndreas Gruenbacher * 31334a76b161SAndreas Gruenbacher * (We can also end up here if drbd is misconfigured.) 31344a76b161SAndreas Gruenbacher */ 31354a76b161SAndreas Gruenbacher static int config_unknown_volume(struct drbd_tconn *tconn, struct packet_info *pi) 31364a76b161SAndreas Gruenbacher { 31374a76b161SAndreas Gruenbacher conn_warn(tconn, "Volume %u unknown; ignoring %s packet\n", 31384a76b161SAndreas Gruenbacher pi->vnr, cmdname(pi->cmd)); 31394a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 31404a76b161SAndreas Gruenbacher } 31414a76b161SAndreas Gruenbacher 31424a76b161SAndreas Gruenbacher static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi) 31434a76b161SAndreas Gruenbacher { 31444a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3145e658983aSAndreas Gruenbacher struct p_rs_param_95 *p; 3146b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 3147b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 3148b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 314991fd4dadSPhilipp Reisner struct net_conf *old_conf, *new_conf = NULL; 31504a76b161SAndreas Gruenbacher const int apv = tconn->agreed_pro_version; 3151778f271dSPhilipp Reisner int *rs_plan_s = NULL; 3152778f271dSPhilipp Reisner int fifo_size = 0; 315382bc0194SAndreas Gruenbacher int err; 3154b411b363SPhilipp Reisner 31554a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 31564a76b161SAndreas Gruenbacher if (!mdev) 31574a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 31584a76b161SAndreas Gruenbacher 3159b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 3160b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 3161b411b363SPhilipp Reisner + SHARED_SECRET_MAX 31628e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 31638e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 3164b411b363SPhilipp Reisner 3165e2857216SAndreas Gruenbacher if (pi->size > exp_max_sz) { 3166b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 3167e2857216SAndreas Gruenbacher pi->size, exp_max_sz); 316882bc0194SAndreas Gruenbacher return -EIO; 3169b411b363SPhilipp Reisner } 3170b411b363SPhilipp Reisner 3171b411b363SPhilipp Reisner if (apv <= 88) { 3172e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param); 3173e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 31748e26f9ccSPhilipp Reisner } else if (apv <= 94) { 3175e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_89); 3176e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3177b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 31788e26f9ccSPhilipp Reisner } else { 3179e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_95); 3180e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3181b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 3182b411b363SPhilipp Reisner } 3183b411b363SPhilipp Reisner 3184b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 3185e658983aSAndreas Gruenbacher p = pi->data; 3186b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 3187b411b363SPhilipp Reisner 3188e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, header_size); 318982bc0194SAndreas Gruenbacher if (err) 319082bc0194SAndreas Gruenbacher return err; 3191b411b363SPhilipp Reisner 3192f399002eSLars Ellenberg if (get_ldev(mdev)) { 3193f399002eSLars Ellenberg mdev->ldev->dc.resync_rate = be32_to_cpu(p->rate); 3194f399002eSLars Ellenberg put_ldev(mdev); 3195f399002eSLars Ellenberg } 3196b411b363SPhilipp Reisner 3197b411b363SPhilipp Reisner if (apv >= 88) { 3198b411b363SPhilipp Reisner if (apv == 88) { 3199b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 3200b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 3201b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 3202b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 320382bc0194SAndreas Gruenbacher return -EIO; 3204b411b363SPhilipp Reisner } 3205b411b363SPhilipp Reisner 320682bc0194SAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size); 320782bc0194SAndreas Gruenbacher if (err) 320882bc0194SAndreas Gruenbacher return err; 3209b411b363SPhilipp Reisner 3210b411b363SPhilipp Reisner /* we expect NUL terminated string */ 3211b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3212b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 3213b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 3214b411b363SPhilipp Reisner 3215b411b363SPhilipp Reisner } else /* apv >= 89 */ { 3216b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 3217b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3218b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 3219b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 3220b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 3221b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 3222b411b363SPhilipp Reisner } 3223b411b363SPhilipp Reisner 322491fd4dadSPhilipp Reisner mutex_lock(&mdev->tconn->net_conf_update); 322591fd4dadSPhilipp Reisner old_conf = mdev->tconn->net_conf; 322691fd4dadSPhilipp Reisner 322791fd4dadSPhilipp Reisner if (strcmp(old_conf->verify_alg, p->verify_alg)) { 3228b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3229b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 323091fd4dadSPhilipp Reisner old_conf->verify_alg, p->verify_alg); 3231b411b363SPhilipp Reisner goto disconnect; 3232b411b363SPhilipp Reisner } 3233b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 3234b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 3235b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 3236b411b363SPhilipp Reisner verify_tfm = NULL; 3237b411b363SPhilipp Reisner goto disconnect; 3238b411b363SPhilipp Reisner } 3239b411b363SPhilipp Reisner } 3240b411b363SPhilipp Reisner 324191fd4dadSPhilipp Reisner if (apv >= 89 && strcmp(old_conf->csums_alg, p->csums_alg)) { 3242b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3243b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 324491fd4dadSPhilipp Reisner old_conf->csums_alg, p->csums_alg); 3245b411b363SPhilipp Reisner goto disconnect; 3246b411b363SPhilipp Reisner } 3247b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 3248b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 3249b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 3250b411b363SPhilipp Reisner csums_tfm = NULL; 3251b411b363SPhilipp Reisner goto disconnect; 3252b411b363SPhilipp Reisner } 3253b411b363SPhilipp Reisner } 3254b411b363SPhilipp Reisner 3255f399002eSLars Ellenberg if (apv > 94 && get_ldev(mdev)) { 3256f399002eSLars Ellenberg mdev->ldev->dc.resync_rate = be32_to_cpu(p->rate); 3257f399002eSLars Ellenberg mdev->ldev->dc.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 3258f399002eSLars Ellenberg mdev->ldev->dc.c_delay_target = be32_to_cpu(p->c_delay_target); 3259f399002eSLars Ellenberg mdev->ldev->dc.c_fill_target = be32_to_cpu(p->c_fill_target); 3260f399002eSLars Ellenberg mdev->ldev->dc.c_max_rate = be32_to_cpu(p->c_max_rate); 3261778f271dSPhilipp Reisner 3262f399002eSLars Ellenberg fifo_size = (mdev->ldev->dc.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 3263778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 3264778f271dSPhilipp Reisner rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 3265778f271dSPhilipp Reisner if (!rs_plan_s) { 3266778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 3267f399002eSLars Ellenberg put_ldev(mdev); 3268778f271dSPhilipp Reisner goto disconnect; 3269778f271dSPhilipp Reisner } 3270778f271dSPhilipp Reisner } 3271f399002eSLars Ellenberg put_ldev(mdev); 32728e26f9ccSPhilipp Reisner } 3273b411b363SPhilipp Reisner 327491fd4dadSPhilipp Reisner if (verify_tfm || csums_tfm) { 327591fd4dadSPhilipp Reisner new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 327691fd4dadSPhilipp Reisner if (!new_conf) { 327791fd4dadSPhilipp Reisner dev_err(DEV, "Allocation of new net_conf failed\n"); 327891fd4dadSPhilipp Reisner goto disconnect; 327991fd4dadSPhilipp Reisner } 328091fd4dadSPhilipp Reisner 328191fd4dadSPhilipp Reisner *new_conf = *old_conf; 328291fd4dadSPhilipp Reisner 3283b411b363SPhilipp Reisner if (verify_tfm) { 328491fd4dadSPhilipp Reisner strcpy(new_conf->verify_alg, p->verify_alg); 328591fd4dadSPhilipp Reisner new_conf->verify_alg_len = strlen(p->verify_alg) + 1; 3286f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->verify_tfm); 3287f399002eSLars Ellenberg mdev->tconn->verify_tfm = verify_tfm; 3288b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 3289b411b363SPhilipp Reisner } 3290b411b363SPhilipp Reisner if (csums_tfm) { 329191fd4dadSPhilipp Reisner strcpy(new_conf->csums_alg, p->csums_alg); 329291fd4dadSPhilipp Reisner new_conf->csums_alg_len = strlen(p->csums_alg) + 1; 3293f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->csums_tfm); 3294f399002eSLars Ellenberg mdev->tconn->csums_tfm = csums_tfm; 3295b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 3296b411b363SPhilipp Reisner } 329791fd4dadSPhilipp Reisner rcu_assign_pointer(tconn->net_conf, new_conf); 329891fd4dadSPhilipp Reisner } 329991fd4dadSPhilipp Reisner mutex_unlock(&mdev->tconn->net_conf_update); 330091fd4dadSPhilipp Reisner if (new_conf) { 330191fd4dadSPhilipp Reisner synchronize_rcu(); 330291fd4dadSPhilipp Reisner kfree(old_conf); 330391fd4dadSPhilipp Reisner } 330491fd4dadSPhilipp Reisner 330591fd4dadSPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 3306778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size) { 3307778f271dSPhilipp Reisner kfree(mdev->rs_plan_s.values); 3308778f271dSPhilipp Reisner mdev->rs_plan_s.values = rs_plan_s; 3309778f271dSPhilipp Reisner mdev->rs_plan_s.size = fifo_size; 3310778f271dSPhilipp Reisner mdev->rs_planed = 0; 3311778f271dSPhilipp Reisner } 3312b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 3313b411b363SPhilipp Reisner } 331482bc0194SAndreas Gruenbacher return 0; 3315b411b363SPhilipp Reisner 3316b411b363SPhilipp Reisner disconnect: 331791fd4dadSPhilipp Reisner mutex_unlock(&mdev->tconn->net_conf_update); 3318b411b363SPhilipp Reisner /* just for completeness: actually not needed, 3319b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 3320b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 3321b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 3322b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 332338fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 332482bc0194SAndreas Gruenbacher return -EIO; 3325b411b363SPhilipp Reisner } 3326b411b363SPhilipp Reisner 3327b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 3328b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 3329b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 3330b411b363SPhilipp Reisner { 3331b411b363SPhilipp Reisner sector_t d; 3332b411b363SPhilipp Reisner if (a == 0 || b == 0) 3333b411b363SPhilipp Reisner return; 3334b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 3335b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 3336b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 3337b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 3338b411b363SPhilipp Reisner } 3339b411b363SPhilipp Reisner 33404a76b161SAndreas Gruenbacher static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi) 3341b411b363SPhilipp Reisner { 33424a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3343e658983aSAndreas Gruenbacher struct p_sizes *p = pi->data; 3344b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 3345b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 3346b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 3347e89b591cSPhilipp Reisner enum dds_flags ddsf; 3348b411b363SPhilipp Reisner 33494a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 33504a76b161SAndreas Gruenbacher if (!mdev) 33514a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 33524a76b161SAndreas Gruenbacher 3353b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 3354b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 3355b411b363SPhilipp Reisner 3356b411b363SPhilipp Reisner /* just store the peer's disk size for now. 3357b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 3358b411b363SPhilipp Reisner mdev->p_size = p_size; 3359b411b363SPhilipp Reisner 3360b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3361b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 3362b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 3363b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 3364b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 3365b411b363SPhilipp Reisner 3366b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 3367b411b363SPhilipp Reisner * param exchange, choose the minimum */ 3368b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 3369b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 3370b411b363SPhilipp Reisner p_usize); 3371b411b363SPhilipp Reisner 3372b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 3373b411b363SPhilipp Reisner 3374b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 3375b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 3376b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3377b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 3378b411b363SPhilipp Reisner } 3379b411b363SPhilipp Reisner 3380b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3381b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3382a393db6fSPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, 0) < 3383b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3384b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3385b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3386b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 338738fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 3388b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 3389b411b363SPhilipp Reisner put_ldev(mdev); 339082bc0194SAndreas Gruenbacher return -EIO; 3391b411b363SPhilipp Reisner } 3392b411b363SPhilipp Reisner put_ldev(mdev); 3393b411b363SPhilipp Reisner } 3394b411b363SPhilipp Reisner 3395e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3396b411b363SPhilipp Reisner if (get_ldev(mdev)) { 339724c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 3398b411b363SPhilipp Reisner put_ldev(mdev); 3399b411b363SPhilipp Reisner if (dd == dev_size_error) 340082bc0194SAndreas Gruenbacher return -EIO; 3401b411b363SPhilipp Reisner drbd_md_sync(mdev); 3402b411b363SPhilipp Reisner } else { 3403b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3404b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3405b411b363SPhilipp Reisner } 3406b411b363SPhilipp Reisner 340799432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 340899432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 340999432fccSPhilipp Reisner 3410b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3411b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3412b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3413b411b363SPhilipp Reisner ldsc = 1; 3414b411b363SPhilipp Reisner } 3415b411b363SPhilipp Reisner 3416b411b363SPhilipp Reisner put_ldev(mdev); 3417b411b363SPhilipp Reisner } 3418b411b363SPhilipp Reisner 3419b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3420b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3421b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3422b411b363SPhilipp Reisner /* we have different sizes, probably peer 3423b411b363SPhilipp Reisner * needs to know my new size... */ 3424e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3425b411b363SPhilipp Reisner } 3426b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3427b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3428b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3429e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3430e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3431e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3432b411b363SPhilipp Reisner else 3433e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3434e89b591cSPhilipp Reisner } else 3435b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3436b411b363SPhilipp Reisner } 3437b411b363SPhilipp Reisner } 3438b411b363SPhilipp Reisner 343982bc0194SAndreas Gruenbacher return 0; 3440b411b363SPhilipp Reisner } 3441b411b363SPhilipp Reisner 34424a76b161SAndreas Gruenbacher static int receive_uuids(struct drbd_tconn *tconn, struct packet_info *pi) 3443b411b363SPhilipp Reisner { 34444a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3445e658983aSAndreas Gruenbacher struct p_uuids *p = pi->data; 3446b411b363SPhilipp Reisner u64 *p_uuid; 344762b0da3aSLars Ellenberg int i, updated_uuids = 0; 3448b411b363SPhilipp Reisner 34494a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 34504a76b161SAndreas Gruenbacher if (!mdev) 34514a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 34524a76b161SAndreas Gruenbacher 3453b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3454b411b363SPhilipp Reisner 3455b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3456b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3457b411b363SPhilipp Reisner 3458b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3459b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3460b411b363SPhilipp Reisner 3461b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3462b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3463b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3464b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3465b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3466b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 346738fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 346882bc0194SAndreas Gruenbacher return -EIO; 3469b411b363SPhilipp Reisner } 3470b411b363SPhilipp Reisner 3471b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3472b411b363SPhilipp Reisner int skip_initial_sync = 3473b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 347431890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90 && 3475b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3476b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3477b411b363SPhilipp Reisner if (skip_initial_sync) { 3478b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3479b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 348020ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 348120ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3482b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3483b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3484b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3485b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3486b411b363SPhilipp Reisner drbd_md_sync(mdev); 348762b0da3aSLars Ellenberg updated_uuids = 1; 3488b411b363SPhilipp Reisner } 3489b411b363SPhilipp Reisner put_ldev(mdev); 349018a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 349118a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 349218a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 349318a50fa2SPhilipp Reisner for me. */ 349462b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3495b411b363SPhilipp Reisner } 3496b411b363SPhilipp Reisner 3497b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3498b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3499b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3500b411b363SPhilipp Reisner new disk state... */ 35018410da8fSPhilipp Reisner mutex_lock(mdev->state_mutex); 35028410da8fSPhilipp Reisner mutex_unlock(mdev->state_mutex); 3503b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 350462b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 350562b0da3aSLars Ellenberg 350662b0da3aSLars Ellenberg if (updated_uuids) 350762b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3508b411b363SPhilipp Reisner 350982bc0194SAndreas Gruenbacher return 0; 3510b411b363SPhilipp Reisner } 3511b411b363SPhilipp Reisner 3512b411b363SPhilipp Reisner /** 3513b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3514b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3515b411b363SPhilipp Reisner */ 3516b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3517b411b363SPhilipp Reisner { 3518b411b363SPhilipp Reisner union drbd_state ms; 3519b411b363SPhilipp Reisner 3520b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3521b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3522b411b363SPhilipp Reisner 3523b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3524b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3525b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3526b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3527b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3528b411b363SPhilipp Reisner }; 3529b411b363SPhilipp Reisner 3530b411b363SPhilipp Reisner ms.i = ps.i; 3531b411b363SPhilipp Reisner 3532b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3533b411b363SPhilipp Reisner ms.peer = ps.role; 3534b411b363SPhilipp Reisner ms.role = ps.peer; 3535b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3536b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3537b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3538b411b363SPhilipp Reisner 3539b411b363SPhilipp Reisner return ms; 3540b411b363SPhilipp Reisner } 3541b411b363SPhilipp Reisner 35424a76b161SAndreas Gruenbacher static int receive_req_state(struct drbd_tconn *tconn, struct packet_info *pi) 3543b411b363SPhilipp Reisner { 35444a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3545e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3546b411b363SPhilipp Reisner union drbd_state mask, val; 3547bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3548b411b363SPhilipp Reisner 35494a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 35504a76b161SAndreas Gruenbacher if (!mdev) 35514a76b161SAndreas Gruenbacher return -EIO; 35524a76b161SAndreas Gruenbacher 3553b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3554b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3555b411b363SPhilipp Reisner 355625703f83SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && 35578410da8fSPhilipp Reisner mutex_is_locked(mdev->state_mutex)) { 3558b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 355982bc0194SAndreas Gruenbacher return 0; 3560b411b363SPhilipp Reisner } 3561b411b363SPhilipp Reisner 3562b411b363SPhilipp Reisner mask = convert_state(mask); 3563b411b363SPhilipp Reisner val = convert_state(val); 3564b411b363SPhilipp Reisner 3565b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3566b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3567047cd4a6SPhilipp Reisner 3568b411b363SPhilipp Reisner drbd_md_sync(mdev); 3569b411b363SPhilipp Reisner 357082bc0194SAndreas Gruenbacher return 0; 3571b411b363SPhilipp Reisner } 3572b411b363SPhilipp Reisner 3573e2857216SAndreas Gruenbacher static int receive_req_conn_state(struct drbd_tconn *tconn, struct packet_info *pi) 3574dfafcc8aSPhilipp Reisner { 3575e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3576dfafcc8aSPhilipp Reisner union drbd_state mask, val; 3577dfafcc8aSPhilipp Reisner enum drbd_state_rv rv; 3578dfafcc8aSPhilipp Reisner 3579dfafcc8aSPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3580dfafcc8aSPhilipp Reisner val.i = be32_to_cpu(p->val); 3581dfafcc8aSPhilipp Reisner 3582dfafcc8aSPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &tconn->flags) && 3583dfafcc8aSPhilipp Reisner mutex_is_locked(&tconn->cstate_mutex)) { 3584dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG); 358582bc0194SAndreas Gruenbacher return 0; 3586dfafcc8aSPhilipp Reisner } 3587dfafcc8aSPhilipp Reisner 3588dfafcc8aSPhilipp Reisner mask = convert_state(mask); 3589dfafcc8aSPhilipp Reisner val = convert_state(val); 3590dfafcc8aSPhilipp Reisner 3591778bcf2eSPhilipp Reisner rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); 3592dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, rv); 3593dfafcc8aSPhilipp Reisner 359482bc0194SAndreas Gruenbacher return 0; 3595dfafcc8aSPhilipp Reisner } 3596dfafcc8aSPhilipp Reisner 35974a76b161SAndreas Gruenbacher static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi) 3598b411b363SPhilipp Reisner { 35994a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3600e658983aSAndreas Gruenbacher struct p_state *p = pi->data; 36014ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3602b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 360365d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3604b411b363SPhilipp Reisner int rv; 3605b411b363SPhilipp Reisner 36064a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 36074a76b161SAndreas Gruenbacher if (!mdev) 36084a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 36094a76b161SAndreas Gruenbacher 3610b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3611b411b363SPhilipp Reisner 3612b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3613b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3614b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3615b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3616b411b363SPhilipp Reisner } 3617b411b363SPhilipp Reisner 361887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3619b411b363SPhilipp Reisner retry: 362078bae59bSPhilipp Reisner os = ns = drbd_read_state(mdev); 362187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3622b411b363SPhilipp Reisner 3623e9ef7bb6SLars Ellenberg /* peer says his disk is uptodate, while we think it is inconsistent, 3624e9ef7bb6SLars Ellenberg * and this happens while we think we have a sync going on. */ 3625e9ef7bb6SLars Ellenberg if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && 3626e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3627e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3628e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3629e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3630e9ef7bb6SLars Ellenberg * syncing states. 3631e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3632e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3633e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3634e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3635e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3636e9ef7bb6SLars Ellenberg 3637e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3638e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3639e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3640e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3641e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3642e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3643e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 364482bc0194SAndreas Gruenbacher return 0; 3645e9ef7bb6SLars Ellenberg } 3646e9ef7bb6SLars Ellenberg } 3647e9ef7bb6SLars Ellenberg 3648e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3649e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3650e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3651e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3652e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3653e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3654e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3655e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3656e9ef7bb6SLars Ellenberg 36574ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 36584ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3659b411b363SPhilipp Reisner 366067531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 366167531718SPhilipp Reisner ns.conn = C_BEHIND; 366267531718SPhilipp Reisner 3663b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3664b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3665b411b363SPhilipp Reisner int cr; /* consider resync */ 3666b411b363SPhilipp Reisner 3667b411b363SPhilipp Reisner /* if we established a new connection */ 36684ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3669b411b363SPhilipp Reisner /* if we had an established connection 3670b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 36714ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3672b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 36734ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3674b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3675b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3676b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3677b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3678b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 36794ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3680b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3681b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3682b411b363SPhilipp Reisner 3683b411b363SPhilipp Reisner if (cr) 36844ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3685b411b363SPhilipp Reisner 3686b411b363SPhilipp Reisner put_ldev(mdev); 36874ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 36884ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3689b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 369082f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3691b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3692b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3693b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3694580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3695b411b363SPhilipp Reisner } else { 36968169e41bSPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags)) 369782bc0194SAndreas Gruenbacher return -EIO; 36984ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 369938fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 370082bc0194SAndreas Gruenbacher return -EIO; 3701b411b363SPhilipp Reisner } 3702b411b363SPhilipp Reisner } 3703b411b363SPhilipp Reisner } 3704b411b363SPhilipp Reisner 370587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 370678bae59bSPhilipp Reisner if (os.i != drbd_read_state(mdev).i) 3707b411b363SPhilipp Reisner goto retry; 3708b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3709b411b363SPhilipp Reisner ns.peer = peer_state.role; 3710b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3711b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 37124ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3713b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 37144ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 37152aebfabbSPhilipp Reisner if (ns.pdsk == D_CONSISTENT && drbd_suspended(mdev) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3716481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 37178554df1cSAndreas Gruenbacher /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this 3718481c6f50SPhilipp Reisner for temporal network outages! */ 371987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3720481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 37212f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 3722481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3723481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 372438fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); 372582bc0194SAndreas Gruenbacher return -EIO; 3726481c6f50SPhilipp Reisner } 372765d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 372878bae59bSPhilipp Reisner ns = drbd_read_state(mdev); 372987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3730b411b363SPhilipp Reisner 3731b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 373238fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 373382bc0194SAndreas Gruenbacher return -EIO; 3734b411b363SPhilipp Reisner } 3735b411b363SPhilipp Reisner 37364ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 37374ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3738b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3739b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3740b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3741b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3742b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3743b411b363SPhilipp Reisner drbd_send_state(mdev); 3744b411b363SPhilipp Reisner } 3745b411b363SPhilipp Reisner } 3746b411b363SPhilipp Reisner 374791fd4dadSPhilipp Reisner mutex_lock(&mdev->tconn->net_conf_update); 374891fd4dadSPhilipp Reisner mdev->tconn->net_conf->want_lose = 0; /* without copy; single bit op is atomic */ 374991fd4dadSPhilipp Reisner mutex_unlock(&mdev->tconn->net_conf_update); 3750b411b363SPhilipp Reisner 3751b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3752b411b363SPhilipp Reisner 375382bc0194SAndreas Gruenbacher return 0; 3754b411b363SPhilipp Reisner } 3755b411b363SPhilipp Reisner 37564a76b161SAndreas Gruenbacher static int receive_sync_uuid(struct drbd_tconn *tconn, struct packet_info *pi) 3757b411b363SPhilipp Reisner { 37584a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3759e658983aSAndreas Gruenbacher struct p_rs_uuid *p = pi->data; 37604a76b161SAndreas Gruenbacher 37614a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 37624a76b161SAndreas Gruenbacher if (!mdev) 37634a76b161SAndreas Gruenbacher return -EIO; 3764b411b363SPhilipp Reisner 3765b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3766b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3767c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3768b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3769b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3770b411b363SPhilipp Reisner 3771b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3772b411b363SPhilipp Reisner 3773b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3774b411b363SPhilipp Reisner _not_ be rotated into the history */ 3775b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3776b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3777b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3778b411b363SPhilipp Reisner 377962b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3780b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3781b411b363SPhilipp Reisner 3782b411b363SPhilipp Reisner put_ldev(mdev); 3783b411b363SPhilipp Reisner } else 3784b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3785b411b363SPhilipp Reisner 378682bc0194SAndreas Gruenbacher return 0; 3787b411b363SPhilipp Reisner } 3788b411b363SPhilipp Reisner 37892c46407dSAndreas Gruenbacher /** 37902c46407dSAndreas Gruenbacher * receive_bitmap_plain 37912c46407dSAndreas Gruenbacher * 37922c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 37932c46407dSAndreas Gruenbacher * code upon failure. 37942c46407dSAndreas Gruenbacher */ 37952c46407dSAndreas Gruenbacher static int 379650d0b1adSAndreas Gruenbacher receive_bitmap_plain(struct drbd_conf *mdev, unsigned int size, 3797e658983aSAndreas Gruenbacher unsigned long *p, struct bm_xfer_ctx *c) 3798b411b363SPhilipp Reisner { 379950d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - 380050d0b1adSAndreas Gruenbacher drbd_header_size(mdev->tconn); 3801e658983aSAndreas Gruenbacher unsigned int num_words = min_t(size_t, data_size / sizeof(*p), 380250d0b1adSAndreas Gruenbacher c->bm_words - c->word_offset); 3803e658983aSAndreas Gruenbacher unsigned int want = num_words * sizeof(*p); 38042c46407dSAndreas Gruenbacher int err; 3805b411b363SPhilipp Reisner 380650d0b1adSAndreas Gruenbacher if (want != size) { 380750d0b1adSAndreas Gruenbacher dev_err(DEV, "%s:want (%u) != size (%u)\n", __func__, want, size); 38082c46407dSAndreas Gruenbacher return -EIO; 3809b411b363SPhilipp Reisner } 3810b411b363SPhilipp Reisner if (want == 0) 38112c46407dSAndreas Gruenbacher return 0; 3812e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, want); 381382bc0194SAndreas Gruenbacher if (err) 38142c46407dSAndreas Gruenbacher return err; 3815b411b363SPhilipp Reisner 3816e658983aSAndreas Gruenbacher drbd_bm_merge_lel(mdev, c->word_offset, num_words, p); 3817b411b363SPhilipp Reisner 3818b411b363SPhilipp Reisner c->word_offset += num_words; 3819b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3820b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3821b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3822b411b363SPhilipp Reisner 38232c46407dSAndreas Gruenbacher return 1; 3824b411b363SPhilipp Reisner } 3825b411b363SPhilipp Reisner 3826a02d1240SAndreas Gruenbacher static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) 3827a02d1240SAndreas Gruenbacher { 3828a02d1240SAndreas Gruenbacher return (enum drbd_bitmap_code)(p->encoding & 0x0f); 3829a02d1240SAndreas Gruenbacher } 3830a02d1240SAndreas Gruenbacher 3831a02d1240SAndreas Gruenbacher static int dcbp_get_start(struct p_compressed_bm *p) 3832a02d1240SAndreas Gruenbacher { 3833a02d1240SAndreas Gruenbacher return (p->encoding & 0x80) != 0; 3834a02d1240SAndreas Gruenbacher } 3835a02d1240SAndreas Gruenbacher 3836a02d1240SAndreas Gruenbacher static int dcbp_get_pad_bits(struct p_compressed_bm *p) 3837a02d1240SAndreas Gruenbacher { 3838a02d1240SAndreas Gruenbacher return (p->encoding >> 4) & 0x7; 3839a02d1240SAndreas Gruenbacher } 3840a02d1240SAndreas Gruenbacher 38412c46407dSAndreas Gruenbacher /** 38422c46407dSAndreas Gruenbacher * recv_bm_rle_bits 38432c46407dSAndreas Gruenbacher * 38442c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 38452c46407dSAndreas Gruenbacher * code upon failure. 38462c46407dSAndreas Gruenbacher */ 38472c46407dSAndreas Gruenbacher static int 3848b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3849b411b363SPhilipp Reisner struct p_compressed_bm *p, 3850c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3851c6d25cfeSPhilipp Reisner unsigned int len) 3852b411b363SPhilipp Reisner { 3853b411b363SPhilipp Reisner struct bitstream bs; 3854b411b363SPhilipp Reisner u64 look_ahead; 3855b411b363SPhilipp Reisner u64 rl; 3856b411b363SPhilipp Reisner u64 tmp; 3857b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3858b411b363SPhilipp Reisner unsigned long e; 3859a02d1240SAndreas Gruenbacher int toggle = dcbp_get_start(p); 3860b411b363SPhilipp Reisner int have; 3861b411b363SPhilipp Reisner int bits; 3862b411b363SPhilipp Reisner 3863a02d1240SAndreas Gruenbacher bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); 3864b411b363SPhilipp Reisner 3865b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3866b411b363SPhilipp Reisner if (bits < 0) 38672c46407dSAndreas Gruenbacher return -EIO; 3868b411b363SPhilipp Reisner 3869b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3870b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3871b411b363SPhilipp Reisner if (bits <= 0) 38722c46407dSAndreas Gruenbacher return -EIO; 3873b411b363SPhilipp Reisner 3874b411b363SPhilipp Reisner if (toggle) { 3875b411b363SPhilipp Reisner e = s + rl -1; 3876b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3877b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 38782c46407dSAndreas Gruenbacher return -EIO; 3879b411b363SPhilipp Reisner } 3880b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3881b411b363SPhilipp Reisner } 3882b411b363SPhilipp Reisner 3883b411b363SPhilipp Reisner if (have < bits) { 3884b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3885b411b363SPhilipp Reisner have, bits, look_ahead, 3886b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3887b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 38882c46407dSAndreas Gruenbacher return -EIO; 3889b411b363SPhilipp Reisner } 3890b411b363SPhilipp Reisner look_ahead >>= bits; 3891b411b363SPhilipp Reisner have -= bits; 3892b411b363SPhilipp Reisner 3893b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3894b411b363SPhilipp Reisner if (bits < 0) 38952c46407dSAndreas Gruenbacher return -EIO; 3896b411b363SPhilipp Reisner look_ahead |= tmp << have; 3897b411b363SPhilipp Reisner have += bits; 3898b411b363SPhilipp Reisner } 3899b411b363SPhilipp Reisner 3900b411b363SPhilipp Reisner c->bit_offset = s; 3901b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3902b411b363SPhilipp Reisner 39032c46407dSAndreas Gruenbacher return (s != c->bm_bits); 3904b411b363SPhilipp Reisner } 3905b411b363SPhilipp Reisner 39062c46407dSAndreas Gruenbacher /** 39072c46407dSAndreas Gruenbacher * decode_bitmap_c 39082c46407dSAndreas Gruenbacher * 39092c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 39102c46407dSAndreas Gruenbacher * code upon failure. 39112c46407dSAndreas Gruenbacher */ 39122c46407dSAndreas Gruenbacher static int 3913b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3914b411b363SPhilipp Reisner struct p_compressed_bm *p, 3915c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3916c6d25cfeSPhilipp Reisner unsigned int len) 3917b411b363SPhilipp Reisner { 3918a02d1240SAndreas Gruenbacher if (dcbp_get_code(p) == RLE_VLI_Bits) 3919e658983aSAndreas Gruenbacher return recv_bm_rle_bits(mdev, p, c, len - sizeof(*p)); 3920b411b363SPhilipp Reisner 3921b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3922b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3923b411b363SPhilipp Reisner * during all our tests. */ 3924b411b363SPhilipp Reisner 3925b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 392638fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 39272c46407dSAndreas Gruenbacher return -EIO; 3928b411b363SPhilipp Reisner } 3929b411b363SPhilipp Reisner 3930b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3931b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3932b411b363SPhilipp Reisner { 3933b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 393450d0b1adSAndreas Gruenbacher unsigned int header_size = drbd_header_size(mdev->tconn); 393550d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; 393650d0b1adSAndreas Gruenbacher unsigned int plain = 393750d0b1adSAndreas Gruenbacher header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + 393850d0b1adSAndreas Gruenbacher c->bm_words * sizeof(unsigned long); 393950d0b1adSAndreas Gruenbacher unsigned int total = c->bytes[0] + c->bytes[1]; 394050d0b1adSAndreas Gruenbacher unsigned int r; 3941b411b363SPhilipp Reisner 3942b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3943b411b363SPhilipp Reisner if (total == 0) 3944b411b363SPhilipp Reisner return; 3945b411b363SPhilipp Reisner 3946b411b363SPhilipp Reisner /* don't report if not compressed */ 3947b411b363SPhilipp Reisner if (total >= plain) 3948b411b363SPhilipp Reisner return; 3949b411b363SPhilipp Reisner 3950b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3951b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3952b411b363SPhilipp Reisner : (1000 * total / plain); 3953b411b363SPhilipp Reisner 3954b411b363SPhilipp Reisner if (r > 1000) 3955b411b363SPhilipp Reisner r = 1000; 3956b411b363SPhilipp Reisner 3957b411b363SPhilipp Reisner r = 1000 - r; 3958b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3959b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3960b411b363SPhilipp Reisner direction, 3961b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3962b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3963b411b363SPhilipp Reisner total, r/10, r % 10); 3964b411b363SPhilipp Reisner } 3965b411b363SPhilipp Reisner 3966b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3967b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3968b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3969b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3970b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3971b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3972b411b363SPhilipp Reisner 3973b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 39744a76b161SAndreas Gruenbacher static int receive_bitmap(struct drbd_tconn *tconn, struct packet_info *pi) 3975b411b363SPhilipp Reisner { 39764a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3977b411b363SPhilipp Reisner struct bm_xfer_ctx c; 39782c46407dSAndreas Gruenbacher int err; 39794a76b161SAndreas Gruenbacher 39804a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 39814a76b161SAndreas Gruenbacher if (!mdev) 39824a76b161SAndreas Gruenbacher return -EIO; 3983b411b363SPhilipp Reisner 398420ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 398520ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 398620ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 3987b411b363SPhilipp Reisner 3988b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3989b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3990b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3991b411b363SPhilipp Reisner }; 3992b411b363SPhilipp Reisner 39932c46407dSAndreas Gruenbacher for(;;) { 3994e658983aSAndreas Gruenbacher if (pi->cmd == P_BITMAP) 3995e658983aSAndreas Gruenbacher err = receive_bitmap_plain(mdev, pi->size, pi->data, &c); 3996e658983aSAndreas Gruenbacher else if (pi->cmd == P_COMPRESSED_BITMAP) { 3997b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3998b411b363SPhilipp Reisner * and the feature is enabled! */ 3999e658983aSAndreas Gruenbacher struct p_compressed_bm *p = pi->data; 4000b411b363SPhilipp Reisner 400150d0b1adSAndreas Gruenbacher if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(tconn)) { 4002b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 400382bc0194SAndreas Gruenbacher err = -EIO; 4004b411b363SPhilipp Reisner goto out; 4005b411b363SPhilipp Reisner } 4006e658983aSAndreas Gruenbacher if (pi->size <= sizeof(*p)) { 4007e2857216SAndreas Gruenbacher dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", pi->size); 400882bc0194SAndreas Gruenbacher err = -EIO; 400978fcbdaeSAndreas Gruenbacher goto out; 4010b411b363SPhilipp Reisner } 4011e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, pi->size); 4012e658983aSAndreas Gruenbacher if (err) 4013e658983aSAndreas Gruenbacher goto out; 4014e2857216SAndreas Gruenbacher err = decode_bitmap_c(mdev, p, &c, pi->size); 4015b411b363SPhilipp Reisner } else { 4016e2857216SAndreas Gruenbacher dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); 401782bc0194SAndreas Gruenbacher err = -EIO; 4018b411b363SPhilipp Reisner goto out; 4019b411b363SPhilipp Reisner } 4020b411b363SPhilipp Reisner 4021e2857216SAndreas Gruenbacher c.packets[pi->cmd == P_BITMAP]++; 402250d0b1adSAndreas Gruenbacher c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(tconn) + pi->size; 4023b411b363SPhilipp Reisner 40242c46407dSAndreas Gruenbacher if (err <= 0) { 40252c46407dSAndreas Gruenbacher if (err < 0) 40262c46407dSAndreas Gruenbacher goto out; 4027b411b363SPhilipp Reisner break; 40282c46407dSAndreas Gruenbacher } 4029e2857216SAndreas Gruenbacher err = drbd_recv_header(mdev->tconn, pi); 403082bc0194SAndreas Gruenbacher if (err) 4031b411b363SPhilipp Reisner goto out; 40322c46407dSAndreas Gruenbacher } 4033b411b363SPhilipp Reisner 4034b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 4035b411b363SPhilipp Reisner 4036b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 4037de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 4038de1f8e4aSAndreas Gruenbacher 403982bc0194SAndreas Gruenbacher err = drbd_send_bitmap(mdev); 404082bc0194SAndreas Gruenbacher if (err) 4041b411b363SPhilipp Reisner goto out; 4042b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 4043de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 4044de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 4045b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 4046b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 4047b411b363SPhilipp Reisner * other threads may have noticed network errors */ 4048b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 4049b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 4050b411b363SPhilipp Reisner } 405182bc0194SAndreas Gruenbacher err = 0; 4052b411b363SPhilipp Reisner 4053b411b363SPhilipp Reisner out: 405420ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 405582bc0194SAndreas Gruenbacher if (!err && mdev->state.conn == C_WF_BITMAP_S) 4056b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 405782bc0194SAndreas Gruenbacher return err; 4058b411b363SPhilipp Reisner } 4059b411b363SPhilipp Reisner 40604a76b161SAndreas Gruenbacher static int receive_skip(struct drbd_tconn *tconn, struct packet_info *pi) 4061b411b363SPhilipp Reisner { 40624a76b161SAndreas Gruenbacher conn_warn(tconn, "skipping unknown optional packet type %d, l: %d!\n", 4063e2857216SAndreas Gruenbacher pi->cmd, pi->size); 40642de876efSPhilipp Reisner 40654a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 40662de876efSPhilipp Reisner } 40672de876efSPhilipp Reisner 40684a76b161SAndreas Gruenbacher static int receive_UnplugRemote(struct drbd_tconn *tconn, struct packet_info *pi) 4069b411b363SPhilipp Reisner { 4070b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 4071b411b363SPhilipp Reisner * with the data requests being unplugged */ 40724a76b161SAndreas Gruenbacher drbd_tcp_quickack(tconn->data.socket); 4073b411b363SPhilipp Reisner 407482bc0194SAndreas Gruenbacher return 0; 4075b411b363SPhilipp Reisner } 4076b411b363SPhilipp Reisner 40774a76b161SAndreas Gruenbacher static int receive_out_of_sync(struct drbd_tconn *tconn, struct packet_info *pi) 407873a01a18SPhilipp Reisner { 40794a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 4080e658983aSAndreas Gruenbacher struct p_block_desc *p = pi->data; 40814a76b161SAndreas Gruenbacher 40824a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 40834a76b161SAndreas Gruenbacher if (!mdev) 40844a76b161SAndreas Gruenbacher return -EIO; 408573a01a18SPhilipp Reisner 4086f735e363SLars Ellenberg switch (mdev->state.conn) { 4087f735e363SLars Ellenberg case C_WF_SYNC_UUID: 4088f735e363SLars Ellenberg case C_WF_BITMAP_T: 4089f735e363SLars Ellenberg case C_BEHIND: 4090f735e363SLars Ellenberg break; 4091f735e363SLars Ellenberg default: 4092f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 4093f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 4094f735e363SLars Ellenberg } 4095f735e363SLars Ellenberg 409673a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 409773a01a18SPhilipp Reisner 409882bc0194SAndreas Gruenbacher return 0; 409973a01a18SPhilipp Reisner } 410073a01a18SPhilipp Reisner 410102918be2SPhilipp Reisner struct data_cmd { 410202918be2SPhilipp Reisner int expect_payload; 410302918be2SPhilipp Reisner size_t pkt_size; 41044a76b161SAndreas Gruenbacher int (*fn)(struct drbd_tconn *, struct packet_info *); 4105b411b363SPhilipp Reisner }; 4106b411b363SPhilipp Reisner 410702918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 41084a76b161SAndreas Gruenbacher [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 41094a76b161SAndreas Gruenbacher [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 41104a76b161SAndreas Gruenbacher [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 41114a76b161SAndreas Gruenbacher [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 4112e658983aSAndreas Gruenbacher [P_BITMAP] = { 1, 0, receive_bitmap } , 4113e658983aSAndreas Gruenbacher [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , 4114e658983aSAndreas Gruenbacher [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, 41154a76b161SAndreas Gruenbacher [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 41164a76b161SAndreas Gruenbacher [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 4117e658983aSAndreas Gruenbacher [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, 4118e658983aSAndreas Gruenbacher [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, 41194a76b161SAndreas Gruenbacher [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 41204a76b161SAndreas Gruenbacher [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 41214a76b161SAndreas Gruenbacher [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 41224a76b161SAndreas Gruenbacher [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 41234a76b161SAndreas Gruenbacher [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 41244a76b161SAndreas Gruenbacher [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 41254a76b161SAndreas Gruenbacher [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 41264a76b161SAndreas Gruenbacher [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 41274a76b161SAndreas Gruenbacher [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 41284a76b161SAndreas Gruenbacher [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 41294a76b161SAndreas Gruenbacher [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 41304a76b161SAndreas Gruenbacher [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, 413102918be2SPhilipp Reisner }; 413202918be2SPhilipp Reisner 4133eefc2f7dSPhilipp Reisner static void drbdd(struct drbd_tconn *tconn) 4134b411b363SPhilipp Reisner { 413577351055SPhilipp Reisner struct packet_info pi; 413602918be2SPhilipp Reisner size_t shs; /* sub header size */ 413782bc0194SAndreas Gruenbacher int err; 4138b411b363SPhilipp Reisner 4139eefc2f7dSPhilipp Reisner while (get_t_state(&tconn->receiver) == RUNNING) { 4140deebe195SAndreas Gruenbacher struct data_cmd *cmd; 4141deebe195SAndreas Gruenbacher 4142eefc2f7dSPhilipp Reisner drbd_thread_current_set_cpu(&tconn->receiver); 414369bc7bc3SAndreas Gruenbacher if (drbd_recv_header(tconn, &pi)) 414402918be2SPhilipp Reisner goto err_out; 414502918be2SPhilipp Reisner 4146deebe195SAndreas Gruenbacher cmd = &drbd_cmd_handler[pi.cmd]; 41474a76b161SAndreas Gruenbacher if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { 4148eefc2f7dSPhilipp Reisner conn_err(tconn, "unknown packet type %d, l: %d!\n", pi.cmd, pi.size); 414902918be2SPhilipp Reisner goto err_out; 41500b33a916SLars Ellenberg } 4151b411b363SPhilipp Reisner 4152e658983aSAndreas Gruenbacher shs = cmd->pkt_size; 4153e658983aSAndreas Gruenbacher if (pi.size > shs && !cmd->expect_payload) { 4154eefc2f7dSPhilipp Reisner conn_err(tconn, "No payload expected %s l:%d\n", cmdname(pi.cmd), pi.size); 4155c13f7e1aSLars Ellenberg goto err_out; 4156c13f7e1aSLars Ellenberg } 4157c13f7e1aSLars Ellenberg 4158c13f7e1aSLars Ellenberg if (shs) { 4159e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, pi.data, shs); 4160a5c31904SAndreas Gruenbacher if (err) 416102918be2SPhilipp Reisner goto err_out; 4162e2857216SAndreas Gruenbacher pi.size -= shs; 4163b411b363SPhilipp Reisner } 416402918be2SPhilipp Reisner 41654a76b161SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 41664a76b161SAndreas Gruenbacher if (err) { 41679f5bdc33SAndreas Gruenbacher conn_err(tconn, "error receiving %s, e: %d l: %d!\n", 41689f5bdc33SAndreas Gruenbacher cmdname(pi.cmd), err, pi.size); 416902918be2SPhilipp Reisner goto err_out; 4170b411b363SPhilipp Reisner } 4171b411b363SPhilipp Reisner } 417282bc0194SAndreas Gruenbacher return; 417302918be2SPhilipp Reisner 417402918be2SPhilipp Reisner err_out: 4175bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 4176b411b363SPhilipp Reisner } 4177b411b363SPhilipp Reisner 41780e29d163SPhilipp Reisner void conn_flush_workqueue(struct drbd_tconn *tconn) 4179b411b363SPhilipp Reisner { 4180b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 4181b411b363SPhilipp Reisner 4182b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 41830e29d163SPhilipp Reisner barr.w.tconn = tconn; 4184b411b363SPhilipp Reisner init_completion(&barr.done); 41850e29d163SPhilipp Reisner drbd_queue_work(&tconn->data.work, &barr.w); 4186b411b363SPhilipp Reisner wait_for_completion(&barr.done); 4187b411b363SPhilipp Reisner } 4188b411b363SPhilipp Reisner 4189360cc740SPhilipp Reisner static void drbd_disconnect(struct drbd_tconn *tconn) 4190b411b363SPhilipp Reisner { 4191bbeb641cSPhilipp Reisner enum drbd_conns oc; 4192b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 4193b411b363SPhilipp Reisner 4194bbeb641cSPhilipp Reisner if (tconn->cstate == C_STANDALONE) 4195b411b363SPhilipp Reisner return; 4196b411b363SPhilipp Reisner 4197b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 4198360cc740SPhilipp Reisner drbd_thread_stop(&tconn->asender); 4199360cc740SPhilipp Reisner drbd_free_sock(tconn); 4200360cc740SPhilipp Reisner 4201d3fcb490SPhilipp Reisner down_read(&drbd_cfg_rwsem); 4202360cc740SPhilipp Reisner idr_for_each(&tconn->volumes, drbd_disconnected, tconn); 4203d3fcb490SPhilipp Reisner up_read(&drbd_cfg_rwsem); 4204360cc740SPhilipp Reisner conn_info(tconn, "Connection closed\n"); 4205360cc740SPhilipp Reisner 4206cb703454SPhilipp Reisner if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN) 4207cb703454SPhilipp Reisner conn_try_outdate_peer_async(tconn); 4208cb703454SPhilipp Reisner 4209360cc740SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 4210bbeb641cSPhilipp Reisner oc = tconn->cstate; 4211bbeb641cSPhilipp Reisner if (oc >= C_UNCONNECTED) 4212bbeb641cSPhilipp Reisner rv = _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); 4213bbeb641cSPhilipp Reisner 4214360cc740SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 4215360cc740SPhilipp Reisner 4216bbeb641cSPhilipp Reisner if (oc == C_DISCONNECTING) { 421791fd4dadSPhilipp Reisner struct net_conf *old_conf; 4218360cc740SPhilipp Reisner 421991fd4dadSPhilipp Reisner mutex_lock(&tconn->net_conf_update); 422091fd4dadSPhilipp Reisner old_conf = tconn->net_conf; 422191fd4dadSPhilipp Reisner rcu_assign_pointer(tconn->net_conf, NULL); 422291fd4dadSPhilipp Reisner conn_free_crypto(tconn); 422391fd4dadSPhilipp Reisner mutex_unlock(&tconn->net_conf_update); 4224360cc740SPhilipp Reisner 422591fd4dadSPhilipp Reisner synchronize_rcu(); 422691fd4dadSPhilipp Reisner kfree(old_conf); 422791fd4dadSPhilipp Reisner 4228d9cc6e23SLars Ellenberg conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); 4229360cc740SPhilipp Reisner } 4230360cc740SPhilipp Reisner } 4231360cc740SPhilipp Reisner 4232360cc740SPhilipp Reisner static int drbd_disconnected(int vnr, void *p, void *data) 4233360cc740SPhilipp Reisner { 4234360cc740SPhilipp Reisner struct drbd_conf *mdev = (struct drbd_conf *)p; 4235360cc740SPhilipp Reisner enum drbd_fencing_p fp; 4236360cc740SPhilipp Reisner unsigned int i; 4237b411b363SPhilipp Reisner 423885719573SPhilipp Reisner /* wait for current activity to cease. */ 423987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4240b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 4241b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 4242b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 424387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4244b411b363SPhilipp Reisner 4245b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 4246b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 4247b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 4248b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 4249b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 4250b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 4251b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 4252b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 4253b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 4254b411b363SPhilipp Reisner * on the fly. */ 4255b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 4256b411b363SPhilipp Reisner mdev->rs_total = 0; 4257b411b363SPhilipp Reisner mdev->rs_failed = 0; 4258b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 4259b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 4260b411b363SPhilipp Reisner 42617fde2be9SPhilipp Reisner del_timer(&mdev->request_timer); 42627fde2be9SPhilipp Reisner 4263b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 4264b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 4265b411b363SPhilipp Reisner 4266b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 4267b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 4268b411b363SPhilipp Reisner * to be "canceled" */ 4269a21e9298SPhilipp Reisner drbd_flush_workqueue(mdev); 4270b411b363SPhilipp Reisner 4271a990be46SAndreas Gruenbacher drbd_finish_peer_reqs(mdev); 4272b411b363SPhilipp Reisner 4273b411b363SPhilipp Reisner kfree(mdev->p_uuid); 4274b411b363SPhilipp Reisner mdev->p_uuid = NULL; 4275b411b363SPhilipp Reisner 42762aebfabbSPhilipp Reisner if (!drbd_suspended(mdev)) 42772f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 4278b411b363SPhilipp Reisner 4279b411b363SPhilipp Reisner drbd_md_sync(mdev); 4280b411b363SPhilipp Reisner 4281b411b363SPhilipp Reisner fp = FP_DONT_CARE; 4282b411b363SPhilipp Reisner if (get_ldev(mdev)) { 4283b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 4284b411b363SPhilipp Reisner put_ldev(mdev); 4285b411b363SPhilipp Reisner } 4286b411b363SPhilipp Reisner 428720ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 428820ceb2b2SLars Ellenberg * if any. */ 428920ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 429020ceb2b2SLars Ellenberg 4291b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 4292b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 4293b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 4294b411b363SPhilipp Reisner * 4295b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 4296b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 4297b411b363SPhilipp Reisner */ 42987721f567SAndreas Gruenbacher i = drbd_free_peer_reqs(mdev, &mdev->net_ee); 4299b411b363SPhilipp Reisner if (i) 4300b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 4301435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 4302435f0740SLars Ellenberg if (i) 4303435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 4304b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 4305b411b363SPhilipp Reisner if (i) 430645bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 4307b411b363SPhilipp Reisner 4308b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 4309b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 4310b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 4311b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 4312b411b363SPhilipp Reisner 4313b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 4314b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 4315b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 4316360cc740SPhilipp Reisner 4317360cc740SPhilipp Reisner return 0; 4318b411b363SPhilipp Reisner } 4319b411b363SPhilipp Reisner 4320b411b363SPhilipp Reisner /* 4321b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 4322b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 4323b411b363SPhilipp Reisner * 4324b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 4325b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 4326b411b363SPhilipp Reisner * 4327b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 4328b411b363SPhilipp Reisner */ 43296038178eSAndreas Gruenbacher static int drbd_send_features(struct drbd_tconn *tconn) 4330b411b363SPhilipp Reisner { 43319f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 43329f5bdc33SAndreas Gruenbacher struct p_connection_features *p; 4333b411b363SPhilipp Reisner 43349f5bdc33SAndreas Gruenbacher sock = &tconn->data; 43359f5bdc33SAndreas Gruenbacher p = conn_prepare_command(tconn, sock); 43369f5bdc33SAndreas Gruenbacher if (!p) 4337e8d17b01SAndreas Gruenbacher return -EIO; 4338b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 4339b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 4340b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 43419f5bdc33SAndreas Gruenbacher return conn_send_command(tconn, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); 4342b411b363SPhilipp Reisner } 4343b411b363SPhilipp Reisner 4344b411b363SPhilipp Reisner /* 4345b411b363SPhilipp Reisner * return values: 4346b411b363SPhilipp Reisner * 1 yes, we have a valid connection 4347b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 4348b411b363SPhilipp Reisner * -1 peer talks different language, 4349b411b363SPhilipp Reisner * no point in trying again, please go standalone. 4350b411b363SPhilipp Reisner */ 43516038178eSAndreas Gruenbacher static int drbd_do_features(struct drbd_tconn *tconn) 4352b411b363SPhilipp Reisner { 435365d11ed6SPhilipp Reisner /* ASSERT current == tconn->receiver ... */ 4354e658983aSAndreas Gruenbacher struct p_connection_features *p; 4355e658983aSAndreas Gruenbacher const int expect = sizeof(struct p_connection_features); 435677351055SPhilipp Reisner struct packet_info pi; 4357a5c31904SAndreas Gruenbacher int err; 4358b411b363SPhilipp Reisner 43596038178eSAndreas Gruenbacher err = drbd_send_features(tconn); 4360e8d17b01SAndreas Gruenbacher if (err) 4361b411b363SPhilipp Reisner return 0; 4362b411b363SPhilipp Reisner 436369bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 436469bc7bc3SAndreas Gruenbacher if (err) 4365b411b363SPhilipp Reisner return 0; 4366b411b363SPhilipp Reisner 43676038178eSAndreas Gruenbacher if (pi.cmd != P_CONNECTION_FEATURES) { 43686038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", 436977351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4370b411b363SPhilipp Reisner return -1; 4371b411b363SPhilipp Reisner } 4372b411b363SPhilipp Reisner 437377351055SPhilipp Reisner if (pi.size != expect) { 43746038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures length: %u, received: %u\n", 437577351055SPhilipp Reisner expect, pi.size); 4376b411b363SPhilipp Reisner return -1; 4377b411b363SPhilipp Reisner } 4378b411b363SPhilipp Reisner 4379e658983aSAndreas Gruenbacher p = pi.data; 4380e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, p, expect); 4381a5c31904SAndreas Gruenbacher if (err) 4382b411b363SPhilipp Reisner return 0; 4383b411b363SPhilipp Reisner 4384b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 4385b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 4386b411b363SPhilipp Reisner if (p->protocol_max == 0) 4387b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 4388b411b363SPhilipp Reisner 4389b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 4390b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 4391b411b363SPhilipp Reisner goto incompat; 4392b411b363SPhilipp Reisner 439365d11ed6SPhilipp Reisner tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 4394b411b363SPhilipp Reisner 439565d11ed6SPhilipp Reisner conn_info(tconn, "Handshake successful: " 439665d11ed6SPhilipp Reisner "Agreed network protocol version %d\n", tconn->agreed_pro_version); 4397b411b363SPhilipp Reisner 4398b411b363SPhilipp Reisner return 1; 4399b411b363SPhilipp Reisner 4400b411b363SPhilipp Reisner incompat: 440165d11ed6SPhilipp Reisner conn_err(tconn, "incompatible DRBD dialects: " 4402b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 4403b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 4404b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 4405b411b363SPhilipp Reisner return -1; 4406b411b363SPhilipp Reisner } 4407b411b363SPhilipp Reisner 4408b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 440913e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4410b411b363SPhilipp Reisner { 4411b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 4412b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 4413b10d96cbSJohannes Thoma return -1; 4414b411b363SPhilipp Reisner } 4415b411b363SPhilipp Reisner #else 4416b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4417b10d96cbSJohannes Thoma 4418b10d96cbSJohannes Thoma /* Return value: 4419b10d96cbSJohannes Thoma 1 - auth succeeded, 4420b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4421b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4422b10d96cbSJohannes Thoma */ 4423b10d96cbSJohannes Thoma 442413e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4425b411b363SPhilipp Reisner { 44269f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 4427b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4428b411b363SPhilipp Reisner struct scatterlist sg; 4429b411b363SPhilipp Reisner char *response = NULL; 4430b411b363SPhilipp Reisner char *right_response = NULL; 4431b411b363SPhilipp Reisner char *peers_ch = NULL; 443244ed167dSPhilipp Reisner unsigned int key_len; 443344ed167dSPhilipp Reisner char secret[SHARED_SECRET_MAX]; /* 64 byte */ 4434b411b363SPhilipp Reisner unsigned int resp_size; 4435b411b363SPhilipp Reisner struct hash_desc desc; 443677351055SPhilipp Reisner struct packet_info pi; 443744ed167dSPhilipp Reisner struct net_conf *nc; 443869bc7bc3SAndreas Gruenbacher int err, rv; 4439b411b363SPhilipp Reisner 44409f5bdc33SAndreas Gruenbacher /* FIXME: Put the challenge/response into the preallocated socket buffer. */ 44419f5bdc33SAndreas Gruenbacher 444244ed167dSPhilipp Reisner rcu_read_lock(); 444344ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 444444ed167dSPhilipp Reisner key_len = strlen(nc->shared_secret); 444544ed167dSPhilipp Reisner memcpy(secret, nc->shared_secret, key_len); 444644ed167dSPhilipp Reisner rcu_read_unlock(); 444744ed167dSPhilipp Reisner 444813e6037dSPhilipp Reisner desc.tfm = tconn->cram_hmac_tfm; 4449b411b363SPhilipp Reisner desc.flags = 0; 4450b411b363SPhilipp Reisner 445144ed167dSPhilipp Reisner rv = crypto_hash_setkey(tconn->cram_hmac_tfm, (u8 *)secret, key_len); 4452b411b363SPhilipp Reisner if (rv) { 445313e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); 4454b10d96cbSJohannes Thoma rv = -1; 4455b411b363SPhilipp Reisner goto fail; 4456b411b363SPhilipp Reisner } 4457b411b363SPhilipp Reisner 4458b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4459b411b363SPhilipp Reisner 44609f5bdc33SAndreas Gruenbacher sock = &tconn->data; 44619f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 44629f5bdc33SAndreas Gruenbacher rv = 0; 44639f5bdc33SAndreas Gruenbacher goto fail; 44649f5bdc33SAndreas Gruenbacher } 4465e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_CHALLENGE, 0, 44669f5bdc33SAndreas Gruenbacher my_challenge, CHALLENGE_LEN); 4467b411b363SPhilipp Reisner if (!rv) 4468b411b363SPhilipp Reisner goto fail; 4469b411b363SPhilipp Reisner 447069bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 447169bc7bc3SAndreas Gruenbacher if (err) { 447269bc7bc3SAndreas Gruenbacher rv = 0; 4473b411b363SPhilipp Reisner goto fail; 447469bc7bc3SAndreas Gruenbacher } 4475b411b363SPhilipp Reisner 447677351055SPhilipp Reisner if (pi.cmd != P_AUTH_CHALLENGE) { 447713e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", 447877351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4479b411b363SPhilipp Reisner rv = 0; 4480b411b363SPhilipp Reisner goto fail; 4481b411b363SPhilipp Reisner } 4482b411b363SPhilipp Reisner 448377351055SPhilipp Reisner if (pi.size > CHALLENGE_LEN * 2) { 448413e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge payload too big.\n"); 4485b10d96cbSJohannes Thoma rv = -1; 4486b411b363SPhilipp Reisner goto fail; 4487b411b363SPhilipp Reisner } 4488b411b363SPhilipp Reisner 448977351055SPhilipp Reisner peers_ch = kmalloc(pi.size, GFP_NOIO); 4490b411b363SPhilipp Reisner if (peers_ch == NULL) { 449113e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of peers_ch failed\n"); 4492b10d96cbSJohannes Thoma rv = -1; 4493b411b363SPhilipp Reisner goto fail; 4494b411b363SPhilipp Reisner } 4495b411b363SPhilipp Reisner 4496a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, peers_ch, pi.size); 4497a5c31904SAndreas Gruenbacher if (err) { 4498b411b363SPhilipp Reisner rv = 0; 4499b411b363SPhilipp Reisner goto fail; 4500b411b363SPhilipp Reisner } 4501b411b363SPhilipp Reisner 450213e6037dSPhilipp Reisner resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); 4503b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4504b411b363SPhilipp Reisner if (response == NULL) { 450513e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of response failed\n"); 4506b10d96cbSJohannes Thoma rv = -1; 4507b411b363SPhilipp Reisner goto fail; 4508b411b363SPhilipp Reisner } 4509b411b363SPhilipp Reisner 4510b411b363SPhilipp Reisner sg_init_table(&sg, 1); 451177351055SPhilipp Reisner sg_set_buf(&sg, peers_ch, pi.size); 4512b411b363SPhilipp Reisner 4513b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4514b411b363SPhilipp Reisner if (rv) { 451513e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4516b10d96cbSJohannes Thoma rv = -1; 4517b411b363SPhilipp Reisner goto fail; 4518b411b363SPhilipp Reisner } 4519b411b363SPhilipp Reisner 45209f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 45219f5bdc33SAndreas Gruenbacher rv = 0; 45229f5bdc33SAndreas Gruenbacher goto fail; 45239f5bdc33SAndreas Gruenbacher } 4524e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_RESPONSE, 0, 45259f5bdc33SAndreas Gruenbacher response, resp_size); 4526b411b363SPhilipp Reisner if (!rv) 4527b411b363SPhilipp Reisner goto fail; 4528b411b363SPhilipp Reisner 452969bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 453069bc7bc3SAndreas Gruenbacher if (err) { 453169bc7bc3SAndreas Gruenbacher rv = 0; 4532b411b363SPhilipp Reisner goto fail; 453369bc7bc3SAndreas Gruenbacher } 4534b411b363SPhilipp Reisner 453577351055SPhilipp Reisner if (pi.cmd != P_AUTH_RESPONSE) { 453613e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", 453777351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4538b411b363SPhilipp Reisner rv = 0; 4539b411b363SPhilipp Reisner goto fail; 4540b411b363SPhilipp Reisner } 4541b411b363SPhilipp Reisner 454277351055SPhilipp Reisner if (pi.size != resp_size) { 454313e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse payload of wrong size\n"); 4544b411b363SPhilipp Reisner rv = 0; 4545b411b363SPhilipp Reisner goto fail; 4546b411b363SPhilipp Reisner } 4547b411b363SPhilipp Reisner 4548a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, response , resp_size); 4549a5c31904SAndreas Gruenbacher if (err) { 4550b411b363SPhilipp Reisner rv = 0; 4551b411b363SPhilipp Reisner goto fail; 4552b411b363SPhilipp Reisner } 4553b411b363SPhilipp Reisner 4554b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 45552d1ee87dSJulia Lawall if (right_response == NULL) { 455613e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of right_response failed\n"); 4557b10d96cbSJohannes Thoma rv = -1; 4558b411b363SPhilipp Reisner goto fail; 4559b411b363SPhilipp Reisner } 4560b411b363SPhilipp Reisner 4561b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4562b411b363SPhilipp Reisner 4563b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4564b411b363SPhilipp Reisner if (rv) { 456513e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4566b10d96cbSJohannes Thoma rv = -1; 4567b411b363SPhilipp Reisner goto fail; 4568b411b363SPhilipp Reisner } 4569b411b363SPhilipp Reisner 4570b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4571b411b363SPhilipp Reisner 4572b411b363SPhilipp Reisner if (rv) 457344ed167dSPhilipp Reisner conn_info(tconn, "Peer authenticated using %d bytes HMAC\n", 457444ed167dSPhilipp Reisner resp_size); 4575b10d96cbSJohannes Thoma else 4576b10d96cbSJohannes Thoma rv = -1; 4577b411b363SPhilipp Reisner 4578b411b363SPhilipp Reisner fail: 4579b411b363SPhilipp Reisner kfree(peers_ch); 4580b411b363SPhilipp Reisner kfree(response); 4581b411b363SPhilipp Reisner kfree(right_response); 4582b411b363SPhilipp Reisner 4583b411b363SPhilipp Reisner return rv; 4584b411b363SPhilipp Reisner } 4585b411b363SPhilipp Reisner #endif 4586b411b363SPhilipp Reisner 4587b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4588b411b363SPhilipp Reisner { 4589392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 4590b411b363SPhilipp Reisner int h; 4591b411b363SPhilipp Reisner 45924d641dd7SPhilipp Reisner conn_info(tconn, "receiver (re)started\n"); 4593b411b363SPhilipp Reisner 4594b411b363SPhilipp Reisner do { 45954d641dd7SPhilipp Reisner h = drbd_connect(tconn); 4596b411b363SPhilipp Reisner if (h == 0) { 45974d641dd7SPhilipp Reisner drbd_disconnect(tconn); 459820ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4599b411b363SPhilipp Reisner } 4600b411b363SPhilipp Reisner if (h == -1) { 46014d641dd7SPhilipp Reisner conn_warn(tconn, "Discarding network configuration.\n"); 4602bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 4603b411b363SPhilipp Reisner } 4604b411b363SPhilipp Reisner } while (h == 0); 4605b411b363SPhilipp Reisner 460691fd4dadSPhilipp Reisner if (h > 0) 46074d641dd7SPhilipp Reisner drbdd(tconn); 4608b411b363SPhilipp Reisner 46094d641dd7SPhilipp Reisner drbd_disconnect(tconn); 4610b411b363SPhilipp Reisner 46114d641dd7SPhilipp Reisner conn_info(tconn, "receiver terminated\n"); 4612b411b363SPhilipp Reisner return 0; 4613b411b363SPhilipp Reisner } 4614b411b363SPhilipp Reisner 4615b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4616b411b363SPhilipp Reisner 4617e05e1e59SAndreas Gruenbacher static int got_conn_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4618b411b363SPhilipp Reisner { 4619e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4620b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4621b411b363SPhilipp Reisner 4622fc3b10a4SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4623fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags); 4624fc3b10a4SPhilipp Reisner } else { 4625fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags); 4626fc3b10a4SPhilipp Reisner conn_err(tconn, "Requested state change failed by peer: %s (%d)\n", 4627fc3b10a4SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4628fc3b10a4SPhilipp Reisner } 4629fc3b10a4SPhilipp Reisner wake_up(&tconn->ping_wait); 4630e4f78edeSPhilipp Reisner 46312735a594SAndreas Gruenbacher return 0; 4632fc3b10a4SPhilipp Reisner } 4633e4f78edeSPhilipp Reisner 46341952e916SAndreas Gruenbacher static int got_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4635e4f78edeSPhilipp Reisner { 46361952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4637e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4638e4f78edeSPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4639e4f78edeSPhilipp Reisner 46401952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 46411952e916SAndreas Gruenbacher if (!mdev) 46422735a594SAndreas Gruenbacher return -EIO; 46431952e916SAndreas Gruenbacher 4644e4f78edeSPhilipp Reisner if (retcode >= SS_SUCCESS) { 4645e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4646e4f78edeSPhilipp Reisner } else { 4647e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4648e4f78edeSPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4649e4f78edeSPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4650e4f78edeSPhilipp Reisner } 4651e4f78edeSPhilipp Reisner wake_up(&mdev->state_wait); 4652e4f78edeSPhilipp Reisner 46532735a594SAndreas Gruenbacher return 0; 4654b411b363SPhilipp Reisner } 4655b411b363SPhilipp Reisner 4656e05e1e59SAndreas Gruenbacher static int got_Ping(struct drbd_tconn *tconn, struct packet_info *pi) 4657b411b363SPhilipp Reisner { 46582735a594SAndreas Gruenbacher return drbd_send_ping_ack(tconn); 4659b411b363SPhilipp Reisner 4660b411b363SPhilipp Reisner } 4661b411b363SPhilipp Reisner 4662e05e1e59SAndreas Gruenbacher static int got_PingAck(struct drbd_tconn *tconn, struct packet_info *pi) 4663b411b363SPhilipp Reisner { 4664b411b363SPhilipp Reisner /* restore idle timeout */ 46652a67d8b9SPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; 46662a67d8b9SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) 46672a67d8b9SPhilipp Reisner wake_up(&tconn->ping_wait); 4668b411b363SPhilipp Reisner 46692735a594SAndreas Gruenbacher return 0; 4670b411b363SPhilipp Reisner } 4671b411b363SPhilipp Reisner 46721952e916SAndreas Gruenbacher static int got_IsInSync(struct drbd_tconn *tconn, struct packet_info *pi) 4673b411b363SPhilipp Reisner { 46741952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4675e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4676b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4677b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4678b411b363SPhilipp Reisner 46791952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 46801952e916SAndreas Gruenbacher if (!mdev) 46812735a594SAndreas Gruenbacher return -EIO; 46821952e916SAndreas Gruenbacher 468331890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 4684b411b363SPhilipp Reisner 4685b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4686b411b363SPhilipp Reisner 46871d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4688b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4689b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4690b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4691b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 46921d53f09eSLars Ellenberg put_ldev(mdev); 46931d53f09eSLars Ellenberg } 4694b411b363SPhilipp Reisner dec_rs_pending(mdev); 4695778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4696b411b363SPhilipp Reisner 46972735a594SAndreas Gruenbacher return 0; 4698b411b363SPhilipp Reisner } 4699b411b363SPhilipp Reisner 4700bc9c5c41SAndreas Gruenbacher static int 4701bc9c5c41SAndreas Gruenbacher validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, 4702bc9c5c41SAndreas Gruenbacher struct rb_root *root, const char *func, 4703bc9c5c41SAndreas Gruenbacher enum drbd_req_event what, bool missing_ok) 4704b411b363SPhilipp Reisner { 4705b411b363SPhilipp Reisner struct drbd_request *req; 4706b411b363SPhilipp Reisner struct bio_and_error m; 4707b411b363SPhilipp Reisner 470887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4709bc9c5c41SAndreas Gruenbacher req = find_request(mdev, root, id, sector, missing_ok, func); 4710b411b363SPhilipp Reisner if (unlikely(!req)) { 471187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 471285997675SAndreas Gruenbacher return -EIO; 4713b411b363SPhilipp Reisner } 4714b411b363SPhilipp Reisner __req_mod(req, what, &m); 471587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4716b411b363SPhilipp Reisner 4717b411b363SPhilipp Reisner if (m.bio) 4718b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 471985997675SAndreas Gruenbacher return 0; 4720b411b363SPhilipp Reisner } 4721b411b363SPhilipp Reisner 47221952e916SAndreas Gruenbacher static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi) 4723b411b363SPhilipp Reisner { 47241952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4725e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4726b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4727b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4728b411b363SPhilipp Reisner enum drbd_req_event what; 4729b411b363SPhilipp Reisner 47301952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 47311952e916SAndreas Gruenbacher if (!mdev) 47322735a594SAndreas Gruenbacher return -EIO; 47331952e916SAndreas Gruenbacher 4734b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4735b411b363SPhilipp Reisner 4736579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4737b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4738b411b363SPhilipp Reisner dec_rs_pending(mdev); 47392735a594SAndreas Gruenbacher return 0; 4740b411b363SPhilipp Reisner } 4741e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 4742b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 47438554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER_AND_SIS; 4744b411b363SPhilipp Reisner break; 4745b411b363SPhilipp Reisner case P_WRITE_ACK: 47468554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER; 4747b411b363SPhilipp Reisner break; 4748b411b363SPhilipp Reisner case P_RECV_ACK: 47498554df1cSAndreas Gruenbacher what = RECV_ACKED_BY_PEER; 4750b411b363SPhilipp Reisner break; 47517be8da07SAndreas Gruenbacher case P_DISCARD_WRITE: 47527be8da07SAndreas Gruenbacher what = DISCARD_WRITE; 47537be8da07SAndreas Gruenbacher break; 47547be8da07SAndreas Gruenbacher case P_RETRY_WRITE: 47557be8da07SAndreas Gruenbacher what = POSTPONE_WRITE; 4756b411b363SPhilipp Reisner break; 4757b411b363SPhilipp Reisner default: 47582735a594SAndreas Gruenbacher BUG(); 4759b411b363SPhilipp Reisner } 4760b411b363SPhilipp Reisner 47612735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 4762bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4763bc9c5c41SAndreas Gruenbacher what, false); 4764b411b363SPhilipp Reisner } 4765b411b363SPhilipp Reisner 47661952e916SAndreas Gruenbacher static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi) 4767b411b363SPhilipp Reisner { 47681952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4769e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4770b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 47712deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 477285997675SAndreas Gruenbacher int err; 4773b411b363SPhilipp Reisner 47741952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 47751952e916SAndreas Gruenbacher if (!mdev) 47762735a594SAndreas Gruenbacher return -EIO; 47771952e916SAndreas Gruenbacher 4778b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4779b411b363SPhilipp Reisner 4780579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4781b411b363SPhilipp Reisner dec_rs_pending(mdev); 4782b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 47832735a594SAndreas Gruenbacher return 0; 4784b411b363SPhilipp Reisner } 47852deb8336SPhilipp Reisner 478685997675SAndreas Gruenbacher err = validate_req_change_req_state(mdev, p->block_id, sector, 4787bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4788303d1448SPhilipp Reisner NEG_ACKED, true); 478985997675SAndreas Gruenbacher if (err) { 47902deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 47912deb8336SPhilipp Reisner The master bio might already be completed, therefore the 4792c3afd8f5SAndreas Gruenbacher request is no longer in the collision hash. */ 47932deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 47942deb8336SPhilipp Reisner but then get a P_NEG_ACK afterwards. */ 4795c3afd8f5SAndreas Gruenbacher drbd_set_out_of_sync(mdev, sector, size); 47962deb8336SPhilipp Reisner } 47972735a594SAndreas Gruenbacher return 0; 4798b411b363SPhilipp Reisner } 4799b411b363SPhilipp Reisner 48001952e916SAndreas Gruenbacher static int got_NegDReply(struct drbd_tconn *tconn, struct packet_info *pi) 4801b411b363SPhilipp Reisner { 48021952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4803e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4804b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4805b411b363SPhilipp Reisner 48061952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48071952e916SAndreas Gruenbacher if (!mdev) 48082735a594SAndreas Gruenbacher return -EIO; 48091952e916SAndreas Gruenbacher 4810b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 48117be8da07SAndreas Gruenbacher 4812b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4813b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4814b411b363SPhilipp Reisner 48152735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 4816bc9c5c41SAndreas Gruenbacher &mdev->read_requests, __func__, 48178554df1cSAndreas Gruenbacher NEG_ACKED, false); 4818b411b363SPhilipp Reisner } 4819b411b363SPhilipp Reisner 48201952e916SAndreas Gruenbacher static int got_NegRSDReply(struct drbd_tconn *tconn, struct packet_info *pi) 4821b411b363SPhilipp Reisner { 48221952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4823b411b363SPhilipp Reisner sector_t sector; 4824b411b363SPhilipp Reisner int size; 4825e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 48261952e916SAndreas Gruenbacher 48271952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48281952e916SAndreas Gruenbacher if (!mdev) 48292735a594SAndreas Gruenbacher return -EIO; 4830b411b363SPhilipp Reisner 4831b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4832b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4833b411b363SPhilipp Reisner 4834b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4835b411b363SPhilipp Reisner 4836b411b363SPhilipp Reisner dec_rs_pending(mdev); 4837b411b363SPhilipp Reisner 4838b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4839b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4840e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 4841d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 4842b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4843d612d309SPhilipp Reisner case P_RS_CANCEL: 4844d612d309SPhilipp Reisner break; 4845d612d309SPhilipp Reisner default: 48462735a594SAndreas Gruenbacher BUG(); 4847d612d309SPhilipp Reisner } 4848b411b363SPhilipp Reisner put_ldev(mdev); 4849b411b363SPhilipp Reisner } 4850b411b363SPhilipp Reisner 48512735a594SAndreas Gruenbacher return 0; 4852b411b363SPhilipp Reisner } 4853b411b363SPhilipp Reisner 48541952e916SAndreas Gruenbacher static int got_BarrierAck(struct drbd_tconn *tconn, struct packet_info *pi) 4855b411b363SPhilipp Reisner { 48561952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4857e658983aSAndreas Gruenbacher struct p_barrier_ack *p = pi->data; 48581952e916SAndreas Gruenbacher 48591952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48601952e916SAndreas Gruenbacher if (!mdev) 48612735a594SAndreas Gruenbacher return -EIO; 4862b411b363SPhilipp Reisner 48632f5cdd0bSPhilipp Reisner tl_release(mdev->tconn, p->barrier, be32_to_cpu(p->set_size)); 4864b411b363SPhilipp Reisner 4865c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 4866c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 4867370a43e7SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) { 4868370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 4869370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 4870c4752ef1SPhilipp Reisner } 4871c4752ef1SPhilipp Reisner 48722735a594SAndreas Gruenbacher return 0; 4873b411b363SPhilipp Reisner } 4874b411b363SPhilipp Reisner 48751952e916SAndreas Gruenbacher static int got_OVResult(struct drbd_tconn *tconn, struct packet_info *pi) 4876b411b363SPhilipp Reisner { 48771952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4878e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4879b411b363SPhilipp Reisner struct drbd_work *w; 4880b411b363SPhilipp Reisner sector_t sector; 4881b411b363SPhilipp Reisner int size; 4882b411b363SPhilipp Reisner 48831952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48841952e916SAndreas Gruenbacher if (!mdev) 48852735a594SAndreas Gruenbacher return -EIO; 48861952e916SAndreas Gruenbacher 4887b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4888b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4889b411b363SPhilipp Reisner 4890b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4891b411b363SPhilipp Reisner 4892b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 48938f7bed77SAndreas Gruenbacher drbd_ov_out_of_sync_found(mdev, sector, size); 4894b411b363SPhilipp Reisner else 48958f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 4896b411b363SPhilipp Reisner 48971d53f09eSLars Ellenberg if (!get_ldev(mdev)) 48982735a594SAndreas Gruenbacher return 0; 48991d53f09eSLars Ellenberg 4900b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4901b411b363SPhilipp Reisner dec_rs_pending(mdev); 4902b411b363SPhilipp Reisner 4903ea5442afSLars Ellenberg --mdev->ov_left; 4904ea5442afSLars Ellenberg 4905ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 4906ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 4907ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 4908ea5442afSLars Ellenberg 4909ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 4910b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4911b411b363SPhilipp Reisner if (w) { 4912b411b363SPhilipp Reisner w->cb = w_ov_finished; 4913a21e9298SPhilipp Reisner w->mdev = mdev; 4914e42325a5SPhilipp Reisner drbd_queue_work_front(&mdev->tconn->data.work, w); 4915b411b363SPhilipp Reisner } else { 4916b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 49178f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 4918b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4919b411b363SPhilipp Reisner } 4920b411b363SPhilipp Reisner } 49211d53f09eSLars Ellenberg put_ldev(mdev); 49222735a594SAndreas Gruenbacher return 0; 4923b411b363SPhilipp Reisner } 4924b411b363SPhilipp Reisner 49251952e916SAndreas Gruenbacher static int got_skip(struct drbd_tconn *tconn, struct packet_info *pi) 49260ced55a3SPhilipp Reisner { 49272735a594SAndreas Gruenbacher return 0; 49280ced55a3SPhilipp Reisner } 49290ced55a3SPhilipp Reisner 4930a990be46SAndreas Gruenbacher static int tconn_finish_peer_reqs(struct drbd_tconn *tconn) 493132862ec7SPhilipp Reisner { 4932082a3439SPhilipp Reisner struct drbd_conf *mdev; 4933082a3439SPhilipp Reisner int i, not_empty = 0; 493432862ec7SPhilipp Reisner 493532862ec7SPhilipp Reisner do { 493632862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 493732862ec7SPhilipp Reisner flush_signals(current); 4938d3fcb490SPhilipp Reisner down_read(&drbd_cfg_rwsem); 4939082a3439SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, i) { 4940d3fcb490SPhilipp Reisner if (drbd_finish_peer_reqs(mdev)) { 4941d3fcb490SPhilipp Reisner up_read(&drbd_cfg_rwsem); 4942082a3439SPhilipp Reisner return 1; /* error */ 4943082a3439SPhilipp Reisner } 4944d3fcb490SPhilipp Reisner } 4945d3fcb490SPhilipp Reisner up_read(&drbd_cfg_rwsem); 494632862ec7SPhilipp Reisner set_bit(SIGNAL_ASENDER, &tconn->flags); 4947082a3439SPhilipp Reisner 4948082a3439SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 4949695d08faSPhilipp Reisner rcu_read_lock(); 4950082a3439SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, i) { 4951082a3439SPhilipp Reisner not_empty = !list_empty(&mdev->done_ee); 4952082a3439SPhilipp Reisner if (not_empty) 4953082a3439SPhilipp Reisner break; 4954082a3439SPhilipp Reisner } 4955695d08faSPhilipp Reisner rcu_read_unlock(); 4956082a3439SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 495732862ec7SPhilipp Reisner } while (not_empty); 495832862ec7SPhilipp Reisner 495932862ec7SPhilipp Reisner return 0; 496032862ec7SPhilipp Reisner } 496132862ec7SPhilipp Reisner 49627201b972SAndreas Gruenbacher struct asender_cmd { 49637201b972SAndreas Gruenbacher size_t pkt_size; 49641952e916SAndreas Gruenbacher int (*fn)(struct drbd_tconn *tconn, struct packet_info *); 49657201b972SAndreas Gruenbacher }; 49667201b972SAndreas Gruenbacher 49677201b972SAndreas Gruenbacher static struct asender_cmd asender_tbl[] = { 4968e658983aSAndreas Gruenbacher [P_PING] = { 0, got_Ping }, 4969e658983aSAndreas Gruenbacher [P_PING_ACK] = { 0, got_PingAck }, 49701952e916SAndreas Gruenbacher [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 49711952e916SAndreas Gruenbacher [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 49721952e916SAndreas Gruenbacher [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 49731952e916SAndreas Gruenbacher [P_DISCARD_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 49741952e916SAndreas Gruenbacher [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 49751952e916SAndreas Gruenbacher [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 49761952e916SAndreas Gruenbacher [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, 49771952e916SAndreas Gruenbacher [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 49781952e916SAndreas Gruenbacher [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 49791952e916SAndreas Gruenbacher [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 49801952e916SAndreas Gruenbacher [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 49811952e916SAndreas Gruenbacher [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 49821952e916SAndreas Gruenbacher [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, 49831952e916SAndreas Gruenbacher [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, 49841952e916SAndreas Gruenbacher [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 49857201b972SAndreas Gruenbacher }; 49867201b972SAndreas Gruenbacher 4987b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4988b411b363SPhilipp Reisner { 4989392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 4990b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 499177351055SPhilipp Reisner struct packet_info pi; 4992257d0af6SPhilipp Reisner int rv; 4993e658983aSAndreas Gruenbacher void *buf = tconn->meta.rbuf; 4994b411b363SPhilipp Reisner int received = 0; 499552b061a4SAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 499652b061a4SAndreas Gruenbacher int expect = header_size; 499744ed167dSPhilipp Reisner bool ping_timeout_active = false; 499844ed167dSPhilipp Reisner struct net_conf *nc; 499944ed167dSPhilipp Reisner int ping_timeo, no_cork, ping_int; 5000b411b363SPhilipp Reisner 5001b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 5002b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 5003b411b363SPhilipp Reisner 5004e77a0a5cSAndreas Gruenbacher while (get_t_state(thi) == RUNNING) { 500580822284SPhilipp Reisner drbd_thread_current_set_cpu(thi); 500644ed167dSPhilipp Reisner 500744ed167dSPhilipp Reisner rcu_read_lock(); 500844ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 500944ed167dSPhilipp Reisner ping_timeo = nc->ping_timeo; 501044ed167dSPhilipp Reisner no_cork = nc->no_cork; 501144ed167dSPhilipp Reisner ping_int = nc->ping_int; 501244ed167dSPhilipp Reisner rcu_read_unlock(); 501344ed167dSPhilipp Reisner 501432862ec7SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &tconn->flags)) { 5015a17647aaSAndreas Gruenbacher if (drbd_send_ping(tconn)) { 501632862ec7SPhilipp Reisner conn_err(tconn, "drbd_send_ping has failed\n"); 5017841ce241SAndreas Gruenbacher goto reconnect; 5018841ce241SAndreas Gruenbacher } 501944ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_timeo * HZ / 10; 502044ed167dSPhilipp Reisner ping_timeout_active = true; 5021b411b363SPhilipp Reisner } 5022b411b363SPhilipp Reisner 502332862ec7SPhilipp Reisner /* TODO: conditionally cork; it may hurt latency if we cork without 502432862ec7SPhilipp Reisner much to send */ 502544ed167dSPhilipp Reisner if (!no_cork) 502632862ec7SPhilipp Reisner drbd_tcp_cork(tconn->meta.socket); 5027a990be46SAndreas Gruenbacher if (tconn_finish_peer_reqs(tconn)) { 5028a990be46SAndreas Gruenbacher conn_err(tconn, "tconn_finish_peer_reqs() failed\n"); 5029b411b363SPhilipp Reisner goto reconnect; 5030082a3439SPhilipp Reisner } 5031b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 503244ed167dSPhilipp Reisner if (!no_cork) 503332862ec7SPhilipp Reisner drbd_tcp_uncork(tconn->meta.socket); 5034b411b363SPhilipp Reisner 5035b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 5036b411b363SPhilipp Reisner if (signal_pending(current)) 5037b411b363SPhilipp Reisner continue; 5038b411b363SPhilipp Reisner 503932862ec7SPhilipp Reisner rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); 504032862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5041b411b363SPhilipp Reisner 5042b411b363SPhilipp Reisner flush_signals(current); 5043b411b363SPhilipp Reisner 5044b411b363SPhilipp Reisner /* Note: 5045b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 5046b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 5047b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 5048b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 5049b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 5050b411b363SPhilipp Reisner * rv == expected: full header or command 5051b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 5052b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 5053b411b363SPhilipp Reisner */ 5054b411b363SPhilipp Reisner if (likely(rv > 0)) { 5055b411b363SPhilipp Reisner received += rv; 5056b411b363SPhilipp Reisner buf += rv; 5057b411b363SPhilipp Reisner } else if (rv == 0) { 505832862ec7SPhilipp Reisner conn_err(tconn, "meta connection shut down by peer.\n"); 5059b411b363SPhilipp Reisner goto reconnect; 5060b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 5061cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 5062cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 506332862ec7SPhilipp Reisner if (time_after(tconn->last_received, 506432862ec7SPhilipp Reisner jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) 5065cb6518cbSLars Ellenberg continue; 5066f36af18cSLars Ellenberg if (ping_timeout_active) { 506732862ec7SPhilipp Reisner conn_err(tconn, "PingAck did not arrive in time.\n"); 5068b411b363SPhilipp Reisner goto reconnect; 5069b411b363SPhilipp Reisner } 507032862ec7SPhilipp Reisner set_bit(SEND_PING, &tconn->flags); 5071b411b363SPhilipp Reisner continue; 5072b411b363SPhilipp Reisner } else if (rv == -EINTR) { 5073b411b363SPhilipp Reisner continue; 5074b411b363SPhilipp Reisner } else { 507532862ec7SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 5076b411b363SPhilipp Reisner goto reconnect; 5077b411b363SPhilipp Reisner } 5078b411b363SPhilipp Reisner 5079b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 5080e658983aSAndreas Gruenbacher if (decode_header(tconn, tconn->meta.rbuf, &pi)) 5081b411b363SPhilipp Reisner goto reconnect; 50827201b972SAndreas Gruenbacher cmd = &asender_tbl[pi.cmd]; 50831952e916SAndreas Gruenbacher if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) { 508432862ec7SPhilipp Reisner conn_err(tconn, "unknown command %d on meta (l: %d)\n", 508577351055SPhilipp Reisner pi.cmd, pi.size); 5086b411b363SPhilipp Reisner goto disconnect; 5087b411b363SPhilipp Reisner } 5088e658983aSAndreas Gruenbacher expect = header_size + cmd->pkt_size; 508952b061a4SAndreas Gruenbacher if (pi.size != expect - header_size) { 509032862ec7SPhilipp Reisner conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", 509177351055SPhilipp Reisner pi.cmd, pi.size); 5092b411b363SPhilipp Reisner goto reconnect; 5093b411b363SPhilipp Reisner } 5094257d0af6SPhilipp Reisner } 5095b411b363SPhilipp Reisner if (received == expect) { 50962735a594SAndreas Gruenbacher bool err; 5097a4fbda8eSPhilipp Reisner 50982735a594SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 50992735a594SAndreas Gruenbacher if (err) { 51001952e916SAndreas Gruenbacher conn_err(tconn, "%pf failed\n", cmd->fn); 5101b411b363SPhilipp Reisner goto reconnect; 51021952e916SAndreas Gruenbacher } 5103b411b363SPhilipp Reisner 5104a4fbda8eSPhilipp Reisner tconn->last_received = jiffies; 5105a4fbda8eSPhilipp Reisner 510644ed167dSPhilipp Reisner if (cmd == &asender_tbl[P_PING_ACK]) { 510744ed167dSPhilipp Reisner /* restore idle timeout */ 510844ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_int * HZ; 510944ed167dSPhilipp Reisner ping_timeout_active = false; 511044ed167dSPhilipp Reisner } 5111f36af18cSLars Ellenberg 5112e658983aSAndreas Gruenbacher buf = tconn->meta.rbuf; 5113b411b363SPhilipp Reisner received = 0; 511452b061a4SAndreas Gruenbacher expect = header_size; 5115b411b363SPhilipp Reisner cmd = NULL; 5116b411b363SPhilipp Reisner } 5117b411b363SPhilipp Reisner } 5118b411b363SPhilipp Reisner 5119b411b363SPhilipp Reisner if (0) { 5120b411b363SPhilipp Reisner reconnect: 5121bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); 5122b411b363SPhilipp Reisner } 5123b411b363SPhilipp Reisner if (0) { 5124b411b363SPhilipp Reisner disconnect: 5125bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 5126b411b363SPhilipp Reisner } 512732862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5128b411b363SPhilipp Reisner 512932862ec7SPhilipp Reisner conn_info(tconn, "asender terminated\n"); 5130b411b363SPhilipp Reisner 5131b411b363SPhilipp Reisner return 0; 5132b411b363SPhilipp Reisner } 5133