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); 66c141ebdaSPhilipp Reisner static int drbd_disconnected(struct drbd_conf *mdev); 67b411b363SPhilipp Reisner 681e9dd291SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_tconn *, 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; 62069ef82deSAndreas Gruenbacher int sndbuf_size, rcvbuf_size, 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 sndbuf_size = nc->sndbuf_size; 63044ed167dSPhilipp Reisner rcvbuf_size = nc->rcvbuf_size; 63169ef82deSAndreas Gruenbacher connect_int = nc->connect_int; 632089c075dSAndreas Gruenbacher rcu_read_unlock(); 63344ed167dSPhilipp Reisner 634089c075dSAndreas Gruenbacher my_addr_len = min_t(int, tconn->my_addr_len, sizeof(src_in6)); 635089c075dSAndreas Gruenbacher memcpy(&src_in6, &tconn->my_addr, my_addr_len); 63644ed167dSPhilipp Reisner 637089c075dSAndreas Gruenbacher if (((struct sockaddr *)&tconn->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 642089c075dSAndreas Gruenbacher peer_addr_len = min_t(int, tconn->peer_addr_len, sizeof(src_in6)); 643089c075dSAndreas Gruenbacher memcpy(&peer_in6, &tconn->peer_addr, peer_addr_len); 644b411b363SPhilipp Reisner 645b411b363SPhilipp Reisner what = "sock_create_kern"; 64644ed167dSPhilipp Reisner err = sock_create_kern(((struct sockaddr *)&src_in6)->sa_family, 647b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 648b411b363SPhilipp Reisner if (err < 0) { 649b411b363SPhilipp Reisner sock = NULL; 650b411b363SPhilipp Reisner goto out; 651b411b363SPhilipp Reisner } 652b411b363SPhilipp Reisner 653b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 65469ef82deSAndreas Gruenbacher sock->sk->sk_sndtimeo = connect_int * HZ; 65544ed167dSPhilipp Reisner drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); 656b411b363SPhilipp Reisner 657b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 658b411b363SPhilipp Reisner * for the outgoing connections. 659b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 660b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 661b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 662b411b363SPhilipp Reisner * a free one dynamically. 663b411b363SPhilipp Reisner */ 664b411b363SPhilipp Reisner what = "bind before connect"; 66544ed167dSPhilipp Reisner err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); 666b411b363SPhilipp Reisner if (err < 0) 667b411b363SPhilipp Reisner goto out; 668b411b363SPhilipp Reisner 669b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 670b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 671b411b363SPhilipp Reisner disconnect_on_error = 0; 672b411b363SPhilipp Reisner what = "connect"; 67344ed167dSPhilipp Reisner err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); 674b411b363SPhilipp Reisner 675b411b363SPhilipp Reisner out: 676b411b363SPhilipp Reisner if (err < 0) { 677b411b363SPhilipp Reisner if (sock) { 678b411b363SPhilipp Reisner sock_release(sock); 679b411b363SPhilipp Reisner sock = NULL; 680b411b363SPhilipp Reisner } 681b411b363SPhilipp Reisner switch (-err) { 682b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 683b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 684b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 685b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 686b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 687b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 688b411b363SPhilipp Reisner disconnect_on_error = 0; 689b411b363SPhilipp Reisner break; 690b411b363SPhilipp Reisner default: 691eac3e990SPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 692b411b363SPhilipp Reisner } 693b411b363SPhilipp Reisner if (disconnect_on_error) 694bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 695b411b363SPhilipp Reisner } 69644ed167dSPhilipp Reisner 697b411b363SPhilipp Reisner return sock; 698b411b363SPhilipp Reisner } 699b411b363SPhilipp Reisner 7007653620dSPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_tconn *tconn) 701b411b363SPhilipp Reisner { 70244ed167dSPhilipp Reisner int timeo, err, my_addr_len; 70369ef82deSAndreas Gruenbacher int sndbuf_size, rcvbuf_size, connect_int; 704b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 70544ed167dSPhilipp Reisner struct sockaddr_in6 my_addr; 70644ed167dSPhilipp Reisner struct net_conf *nc; 707b411b363SPhilipp Reisner const char *what; 708b411b363SPhilipp Reisner 70944ed167dSPhilipp Reisner rcu_read_lock(); 71044ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 71144ed167dSPhilipp Reisner if (!nc) { 71244ed167dSPhilipp Reisner rcu_read_unlock(); 713b411b363SPhilipp Reisner return NULL; 71444ed167dSPhilipp Reisner } 71544ed167dSPhilipp Reisner sndbuf_size = nc->sndbuf_size; 71644ed167dSPhilipp Reisner rcvbuf_size = nc->rcvbuf_size; 71769ef82deSAndreas Gruenbacher connect_int = nc->connect_int; 71844ed167dSPhilipp Reisner rcu_read_unlock(); 719b411b363SPhilipp Reisner 720089c075dSAndreas Gruenbacher my_addr_len = min_t(int, tconn->my_addr_len, sizeof(struct sockaddr_in6)); 721089c075dSAndreas Gruenbacher memcpy(&my_addr, &tconn->my_addr, my_addr_len); 722089c075dSAndreas Gruenbacher 723b411b363SPhilipp Reisner what = "sock_create_kern"; 72444ed167dSPhilipp Reisner err = sock_create_kern(((struct sockaddr *)&my_addr)->sa_family, 725b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 726b411b363SPhilipp Reisner if (err) { 727b411b363SPhilipp Reisner s_listen = NULL; 728b411b363SPhilipp Reisner goto out; 729b411b363SPhilipp Reisner } 730b411b363SPhilipp Reisner 73169ef82deSAndreas Gruenbacher timeo = connect_int * HZ; 732b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 733b411b363SPhilipp Reisner 734b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 735b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 736b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 73744ed167dSPhilipp Reisner drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); 738b411b363SPhilipp Reisner 739b411b363SPhilipp Reisner what = "bind before listen"; 74044ed167dSPhilipp Reisner err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); 741b411b363SPhilipp Reisner if (err < 0) 742b411b363SPhilipp Reisner goto out; 743b411b363SPhilipp Reisner 7447653620dSPhilipp Reisner err = drbd_accept(&what, s_listen, &s_estab); 745b411b363SPhilipp Reisner 746b411b363SPhilipp Reisner out: 747b411b363SPhilipp Reisner if (s_listen) 748b411b363SPhilipp Reisner sock_release(s_listen); 749b411b363SPhilipp Reisner if (err < 0) { 750b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 7517653620dSPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 752bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 753b411b363SPhilipp Reisner } 754b411b363SPhilipp Reisner } 755b411b363SPhilipp Reisner 756b411b363SPhilipp Reisner return s_estab; 757b411b363SPhilipp Reisner } 758b411b363SPhilipp Reisner 759e658983aSAndreas Gruenbacher static int decode_header(struct drbd_tconn *, void *, struct packet_info *); 760b411b363SPhilipp Reisner 7619f5bdc33SAndreas Gruenbacher static int send_first_packet(struct drbd_tconn *tconn, struct drbd_socket *sock, 7629f5bdc33SAndreas Gruenbacher enum drbd_packet cmd) 7639f5bdc33SAndreas Gruenbacher { 7649f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) 7659f5bdc33SAndreas Gruenbacher return -EIO; 766e658983aSAndreas Gruenbacher return conn_send_command(tconn, sock, cmd, 0, NULL, 0); 767b411b363SPhilipp Reisner } 768b411b363SPhilipp Reisner 7699f5bdc33SAndreas Gruenbacher static int receive_first_packet(struct drbd_tconn *tconn, struct socket *sock) 770b411b363SPhilipp Reisner { 7719f5bdc33SAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 7729f5bdc33SAndreas Gruenbacher struct packet_info pi; 7739f5bdc33SAndreas Gruenbacher int err; 774b411b363SPhilipp Reisner 7759f5bdc33SAndreas Gruenbacher err = drbd_recv_short(sock, tconn->data.rbuf, header_size, 0); 7769f5bdc33SAndreas Gruenbacher if (err != header_size) { 7779f5bdc33SAndreas Gruenbacher if (err >= 0) 7789f5bdc33SAndreas Gruenbacher err = -EIO; 7799f5bdc33SAndreas Gruenbacher return err; 7809f5bdc33SAndreas Gruenbacher } 7819f5bdc33SAndreas Gruenbacher err = decode_header(tconn, tconn->data.rbuf, &pi); 7829f5bdc33SAndreas Gruenbacher if (err) 7839f5bdc33SAndreas Gruenbacher return err; 7849f5bdc33SAndreas Gruenbacher return pi.cmd; 785b411b363SPhilipp Reisner } 786b411b363SPhilipp Reisner 787b411b363SPhilipp Reisner /** 788b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 789b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 790b411b363SPhilipp Reisner */ 791dbd9eea0SPhilipp Reisner static int drbd_socket_okay(struct socket **sock) 792b411b363SPhilipp Reisner { 793b411b363SPhilipp Reisner int rr; 794b411b363SPhilipp Reisner char tb[4]; 795b411b363SPhilipp Reisner 796b411b363SPhilipp Reisner if (!*sock) 79781e84650SAndreas Gruenbacher return false; 798b411b363SPhilipp Reisner 799dbd9eea0SPhilipp Reisner rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 800b411b363SPhilipp Reisner 801b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 80281e84650SAndreas Gruenbacher return true; 803b411b363SPhilipp Reisner } else { 804b411b363SPhilipp Reisner sock_release(*sock); 805b411b363SPhilipp Reisner *sock = NULL; 80681e84650SAndreas Gruenbacher return false; 807b411b363SPhilipp Reisner } 808b411b363SPhilipp Reisner } 8092325eb66SPhilipp Reisner /* Gets called if a connection is established, or if a new minor gets created 8102325eb66SPhilipp Reisner in a connection */ 811c141ebdaSPhilipp Reisner int drbd_connected(struct drbd_conf *mdev) 812907599e0SPhilipp Reisner { 8130829f5edSAndreas Gruenbacher int err; 814907599e0SPhilipp Reisner 815907599e0SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 816907599e0SPhilipp Reisner mdev->peer_seq = 0; 817907599e0SPhilipp Reisner 8188410da8fSPhilipp Reisner mdev->state_mutex = mdev->tconn->agreed_pro_version < 100 ? 8198410da8fSPhilipp Reisner &mdev->tconn->cstate_mutex : 8208410da8fSPhilipp Reisner &mdev->own_state_mutex; 8218410da8fSPhilipp Reisner 8220829f5edSAndreas Gruenbacher err = drbd_send_sync_param(mdev); 8230829f5edSAndreas Gruenbacher if (!err) 8240829f5edSAndreas Gruenbacher err = drbd_send_sizes(mdev, 0, 0); 8250829f5edSAndreas Gruenbacher if (!err) 8260829f5edSAndreas Gruenbacher err = drbd_send_uuids(mdev); 8270829f5edSAndreas Gruenbacher if (!err) 82843de7c85SPhilipp Reisner err = drbd_send_current_state(mdev); 829907599e0SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 830907599e0SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 8318b924f1dSPhilipp Reisner mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ 8320829f5edSAndreas Gruenbacher return err; 833907599e0SPhilipp Reisner } 834907599e0SPhilipp Reisner 835b411b363SPhilipp Reisner /* 836b411b363SPhilipp Reisner * return values: 837b411b363SPhilipp Reisner * 1 yes, we have a valid connection 838b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 839b411b363SPhilipp Reisner * -1 peer talks different language, 840b411b363SPhilipp Reisner * no point in trying again, please go standalone. 841b411b363SPhilipp Reisner * -2 We do not have a network config... 842b411b363SPhilipp Reisner */ 84381fa2e67SPhilipp Reisner static int conn_connect(struct drbd_tconn *tconn) 844b411b363SPhilipp Reisner { 8457da35862SPhilipp Reisner struct drbd_socket sock, msock; 846c141ebdaSPhilipp Reisner struct drbd_conf *mdev; 84744ed167dSPhilipp Reisner struct net_conf *nc; 848c141ebdaSPhilipp Reisner int vnr, timeout, try, h, ok; 84908b165baSPhilipp Reisner bool discard_my_data; 850b411b363SPhilipp Reisner 851bbeb641cSPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) 852b411b363SPhilipp Reisner return -2; 853b411b363SPhilipp Reisner 8547da35862SPhilipp Reisner mutex_init(&sock.mutex); 8557da35862SPhilipp Reisner sock.sbuf = tconn->data.sbuf; 8567da35862SPhilipp Reisner sock.rbuf = tconn->data.rbuf; 8577da35862SPhilipp Reisner sock.socket = NULL; 8587da35862SPhilipp Reisner mutex_init(&msock.mutex); 8597da35862SPhilipp Reisner msock.sbuf = tconn->meta.sbuf; 8607da35862SPhilipp Reisner msock.rbuf = tconn->meta.rbuf; 8617da35862SPhilipp Reisner msock.socket = NULL; 8627da35862SPhilipp Reisner 863907599e0SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &tconn->flags); 8640916e0e3SAndreas Gruenbacher 8650916e0e3SAndreas Gruenbacher /* Assume that the peer only understands protocol 80 until we know better. */ 8660916e0e3SAndreas Gruenbacher tconn->agreed_pro_version = 80; 867b411b363SPhilipp Reisner 868b411b363SPhilipp Reisner do { 8692bf89621SAndreas Gruenbacher struct socket *s; 8702bf89621SAndreas Gruenbacher 871b411b363SPhilipp Reisner for (try = 0;;) { 872b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 873907599e0SPhilipp Reisner s = drbd_try_connect(tconn); 874b411b363SPhilipp Reisner if (s || ++try >= 3) 875b411b363SPhilipp Reisner break; 876b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 87720ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 878b411b363SPhilipp Reisner } 879b411b363SPhilipp Reisner 880b411b363SPhilipp Reisner if (s) { 8817da35862SPhilipp Reisner if (!sock.socket) { 8827da35862SPhilipp Reisner sock.socket = s; 8837da35862SPhilipp Reisner send_first_packet(tconn, &sock, P_INITIAL_DATA); 8847da35862SPhilipp Reisner } else if (!msock.socket) { 8857da35862SPhilipp Reisner msock.socket = s; 8867da35862SPhilipp Reisner send_first_packet(tconn, &msock, P_INITIAL_META); 887b411b363SPhilipp Reisner } else { 88881fa2e67SPhilipp Reisner conn_err(tconn, "Logic error in conn_connect()\n"); 889b411b363SPhilipp Reisner goto out_release_sockets; 890b411b363SPhilipp Reisner } 891b411b363SPhilipp Reisner } 892b411b363SPhilipp Reisner 8937da35862SPhilipp Reisner if (sock.socket && msock.socket) { 8947da35862SPhilipp Reisner rcu_read_lock(); 8957da35862SPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 8967da35862SPhilipp Reisner timeout = nc->ping_timeo * HZ / 10; 8977da35862SPhilipp Reisner rcu_read_unlock(); 8987da35862SPhilipp Reisner schedule_timeout_interruptible(timeout); 8997da35862SPhilipp Reisner ok = drbd_socket_okay(&sock.socket); 9007da35862SPhilipp Reisner ok = drbd_socket_okay(&msock.socket) && ok; 901b411b363SPhilipp Reisner if (ok) 902b411b363SPhilipp Reisner break; 903b411b363SPhilipp Reisner } 904b411b363SPhilipp Reisner 905b411b363SPhilipp Reisner retry: 906907599e0SPhilipp Reisner s = drbd_wait_for_connect(tconn); 907b411b363SPhilipp Reisner if (s) { 9089f5bdc33SAndreas Gruenbacher try = receive_first_packet(tconn, s); 9097da35862SPhilipp Reisner drbd_socket_okay(&sock.socket); 9107da35862SPhilipp Reisner drbd_socket_okay(&msock.socket); 911b411b363SPhilipp Reisner switch (try) { 912e5d6f33aSAndreas Gruenbacher case P_INITIAL_DATA: 9137da35862SPhilipp Reisner if (sock.socket) { 914907599e0SPhilipp Reisner conn_warn(tconn, "initial packet S crossed\n"); 9157da35862SPhilipp Reisner sock_release(sock.socket); 916b411b363SPhilipp Reisner } 9177da35862SPhilipp Reisner sock.socket = s; 918b411b363SPhilipp Reisner break; 919e5d6f33aSAndreas Gruenbacher case P_INITIAL_META: 9207da35862SPhilipp Reisner if (msock.socket) { 921907599e0SPhilipp Reisner conn_warn(tconn, "initial packet M crossed\n"); 9227da35862SPhilipp Reisner sock_release(msock.socket); 923b411b363SPhilipp Reisner } 9247da35862SPhilipp Reisner msock.socket = s; 925907599e0SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &tconn->flags); 926b411b363SPhilipp Reisner break; 927b411b363SPhilipp Reisner default: 928907599e0SPhilipp Reisner conn_warn(tconn, "Error receiving initial packet\n"); 929b411b363SPhilipp Reisner sock_release(s); 930b411b363SPhilipp Reisner if (random32() & 1) 931b411b363SPhilipp Reisner goto retry; 932b411b363SPhilipp Reisner } 933b411b363SPhilipp Reisner } 934b411b363SPhilipp Reisner 935bbeb641cSPhilipp Reisner if (tconn->cstate <= C_DISCONNECTING) 936b411b363SPhilipp Reisner goto out_release_sockets; 937b411b363SPhilipp Reisner if (signal_pending(current)) { 938b411b363SPhilipp Reisner flush_signals(current); 939b411b363SPhilipp Reisner smp_rmb(); 940907599e0SPhilipp Reisner if (get_t_state(&tconn->receiver) == EXITING) 941b411b363SPhilipp Reisner goto out_release_sockets; 942b411b363SPhilipp Reisner } 943b411b363SPhilipp Reisner 9447da35862SPhilipp Reisner if (sock.socket && &msock.socket) { 9457da35862SPhilipp Reisner ok = drbd_socket_okay(&sock.socket); 9467da35862SPhilipp Reisner ok = drbd_socket_okay(&msock.socket) && ok; 947b411b363SPhilipp Reisner if (ok) 948b411b363SPhilipp Reisner break; 949b411b363SPhilipp Reisner } 950b411b363SPhilipp Reisner } while (1); 951b411b363SPhilipp Reisner 9527da35862SPhilipp Reisner sock.socket->sk->sk_reuse = 1; /* SO_REUSEADDR */ 9537da35862SPhilipp Reisner msock.socket->sk->sk_reuse = 1; /* SO_REUSEADDR */ 9542bf89621SAndreas Gruenbacher 9557da35862SPhilipp Reisner sock.socket->sk->sk_allocation = GFP_NOIO; 9567da35862SPhilipp Reisner msock.socket->sk->sk_allocation = GFP_NOIO; 957b411b363SPhilipp Reisner 9587da35862SPhilipp Reisner sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 9597da35862SPhilipp Reisner msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE; 960b411b363SPhilipp Reisner 961b411b363SPhilipp Reisner /* NOT YET ... 9627da35862SPhilipp Reisner * sock.socket->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; 9637da35862SPhilipp Reisner * sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 9646038178eSAndreas Gruenbacher * first set it to the P_CONNECTION_FEATURES timeout, 965b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 96644ed167dSPhilipp Reisner rcu_read_lock(); 96744ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 968b411b363SPhilipp Reisner 9697da35862SPhilipp Reisner sock.socket->sk->sk_sndtimeo = 9707da35862SPhilipp Reisner sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; 97144ed167dSPhilipp Reisner 9727da35862SPhilipp Reisner msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ; 97344ed167dSPhilipp Reisner timeout = nc->timeout * HZ / 10; 97408b165baSPhilipp Reisner discard_my_data = nc->discard_my_data; 97544ed167dSPhilipp Reisner rcu_read_unlock(); 97644ed167dSPhilipp Reisner 9777da35862SPhilipp Reisner msock.socket->sk->sk_sndtimeo = timeout; 978b411b363SPhilipp Reisner 979b411b363SPhilipp Reisner /* we don't want delays. 98025985edcSLucas De Marchi * we use TCP_CORK where appropriate, though */ 9817da35862SPhilipp Reisner drbd_tcp_nodelay(sock.socket); 9827da35862SPhilipp Reisner drbd_tcp_nodelay(msock.socket); 983b411b363SPhilipp Reisner 9847da35862SPhilipp Reisner tconn->data.socket = sock.socket; 9857da35862SPhilipp Reisner tconn->meta.socket = msock.socket; 986907599e0SPhilipp Reisner tconn->last_received = jiffies; 987b411b363SPhilipp Reisner 9886038178eSAndreas Gruenbacher h = drbd_do_features(tconn); 989b411b363SPhilipp Reisner if (h <= 0) 990b411b363SPhilipp Reisner return h; 991b411b363SPhilipp Reisner 992907599e0SPhilipp Reisner if (tconn->cram_hmac_tfm) { 993b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 994907599e0SPhilipp Reisner switch (drbd_do_auth(tconn)) { 995b10d96cbSJohannes Thoma case -1: 996907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed\n"); 997b411b363SPhilipp Reisner return -1; 998b10d96cbSJohannes Thoma case 0: 999907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed, trying again.\n"); 1000b10d96cbSJohannes Thoma return 0; 1001b411b363SPhilipp Reisner } 1002b411b363SPhilipp Reisner } 1003b411b363SPhilipp Reisner 10047da35862SPhilipp Reisner tconn->data.socket->sk->sk_sndtimeo = timeout; 10057da35862SPhilipp Reisner tconn->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1006b411b363SPhilipp Reisner 1007387eb308SAndreas Gruenbacher if (drbd_send_protocol(tconn) == -EOPNOTSUPP) 10087e2455c1SPhilipp Reisner return -1; 1009b411b363SPhilipp Reisner 1010c141ebdaSPhilipp Reisner rcu_read_lock(); 1011c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 1012c141ebdaSPhilipp Reisner kref_get(&mdev->kref); 1013c141ebdaSPhilipp Reisner rcu_read_unlock(); 101408b165baSPhilipp Reisner 101508b165baSPhilipp Reisner if (discard_my_data) 101608b165baSPhilipp Reisner set_bit(DISCARD_MY_DATA, &mdev->flags); 101708b165baSPhilipp Reisner else 101808b165baSPhilipp Reisner clear_bit(DISCARD_MY_DATA, &mdev->flags); 101908b165baSPhilipp Reisner 1020c141ebdaSPhilipp Reisner drbd_connected(mdev); 1021c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 1022c141ebdaSPhilipp Reisner rcu_read_lock(); 1023c141ebdaSPhilipp Reisner } 1024c141ebdaSPhilipp Reisner rcu_read_unlock(); 1025c141ebdaSPhilipp Reisner 1026823bd832SPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE) < SS_SUCCESS) 1027823bd832SPhilipp Reisner return 0; 1028823bd832SPhilipp Reisner 1029823bd832SPhilipp Reisner drbd_thread_start(&tconn->asender); 1030823bd832SPhilipp Reisner 103108b165baSPhilipp Reisner mutex_lock(&tconn->conf_update); 103208b165baSPhilipp Reisner /* The discard_my_data flag is a single-shot modifier to the next 103308b165baSPhilipp Reisner * connection attempt, the handshake of which is now well underway. 103408b165baSPhilipp Reisner * No need for rcu style copying of the whole struct 103508b165baSPhilipp Reisner * just to clear a single value. */ 103608b165baSPhilipp Reisner tconn->net_conf->discard_my_data = 0; 103708b165baSPhilipp Reisner mutex_unlock(&tconn->conf_update); 103808b165baSPhilipp Reisner 1039d3fcb490SPhilipp Reisner return h; 1040b411b363SPhilipp Reisner 1041b411b363SPhilipp Reisner out_release_sockets: 10427da35862SPhilipp Reisner if (sock.socket) 10437da35862SPhilipp Reisner sock_release(sock.socket); 10447da35862SPhilipp Reisner if (msock.socket) 10457da35862SPhilipp Reisner sock_release(msock.socket); 1046b411b363SPhilipp Reisner return -1; 1047b411b363SPhilipp Reisner } 1048b411b363SPhilipp Reisner 1049e658983aSAndreas Gruenbacher static int decode_header(struct drbd_tconn *tconn, void *header, struct packet_info *pi) 1050b411b363SPhilipp Reisner { 1051e658983aSAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 1052e658983aSAndreas Gruenbacher 10530c8e36d9SAndreas Gruenbacher if (header_size == sizeof(struct p_header100) && 10540c8e36d9SAndreas Gruenbacher *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { 10550c8e36d9SAndreas Gruenbacher struct p_header100 *h = header; 10560c8e36d9SAndreas Gruenbacher if (h->pad != 0) { 10570c8e36d9SAndreas Gruenbacher conn_err(tconn, "Header padding is not zero\n"); 10580c8e36d9SAndreas Gruenbacher return -EINVAL; 10590c8e36d9SAndreas Gruenbacher } 10600c8e36d9SAndreas Gruenbacher pi->vnr = be16_to_cpu(h->volume); 10610c8e36d9SAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 10620c8e36d9SAndreas Gruenbacher pi->size = be32_to_cpu(h->length); 10630c8e36d9SAndreas Gruenbacher } else if (header_size == sizeof(struct p_header95) && 1064e658983aSAndreas Gruenbacher *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { 1065e658983aSAndreas Gruenbacher struct p_header95 *h = header; 1066e658983aSAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 1067b55d84baSAndreas Gruenbacher pi->size = be32_to_cpu(h->length); 1068eefc2f7dSPhilipp Reisner pi->vnr = 0; 1069e658983aSAndreas Gruenbacher } else if (header_size == sizeof(struct p_header80) && 1070e658983aSAndreas Gruenbacher *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { 1071e658983aSAndreas Gruenbacher struct p_header80 *h = header; 1072e658983aSAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 1073e658983aSAndreas Gruenbacher pi->size = be16_to_cpu(h->length); 107477351055SPhilipp Reisner pi->vnr = 0; 107502918be2SPhilipp Reisner } else { 1076e658983aSAndreas Gruenbacher conn_err(tconn, "Wrong magic value 0x%08x in protocol version %d\n", 1077e658983aSAndreas Gruenbacher be32_to_cpu(*(__be32 *)header), 1078e658983aSAndreas Gruenbacher tconn->agreed_pro_version); 10798172f3e9SAndreas Gruenbacher return -EINVAL; 1080b411b363SPhilipp Reisner } 1081e658983aSAndreas Gruenbacher pi->data = header + header_size; 10828172f3e9SAndreas Gruenbacher return 0; 1083257d0af6SPhilipp Reisner } 1084257d0af6SPhilipp Reisner 10859ba7aa00SPhilipp Reisner static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi) 1086257d0af6SPhilipp Reisner { 1087e658983aSAndreas Gruenbacher void *buffer = tconn->data.rbuf; 108869bc7bc3SAndreas Gruenbacher int err; 1089257d0af6SPhilipp Reisner 1090e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, buffer, drbd_header_size(tconn)); 1091a5c31904SAndreas Gruenbacher if (err) 109269bc7bc3SAndreas Gruenbacher return err; 1093257d0af6SPhilipp Reisner 1094e658983aSAndreas Gruenbacher err = decode_header(tconn, buffer, pi); 10959ba7aa00SPhilipp Reisner tconn->last_received = jiffies; 1096b411b363SPhilipp Reisner 109769bc7bc3SAndreas Gruenbacher return err; 1098b411b363SPhilipp Reisner } 1099b411b363SPhilipp Reisner 11004b0007c0SPhilipp Reisner static void drbd_flush(struct drbd_tconn *tconn) 1101b411b363SPhilipp Reisner { 1102b411b363SPhilipp Reisner int rv; 11034b0007c0SPhilipp Reisner struct drbd_conf *mdev; 11044b0007c0SPhilipp Reisner int vnr; 1105b411b363SPhilipp Reisner 11064b0007c0SPhilipp Reisner if (tconn->write_ordering >= WO_bdev_flush) { 1107615e087fSLars Ellenberg rcu_read_lock(); 11084b0007c0SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 1109615e087fSLars Ellenberg if (!get_ldev(mdev)) 1110615e087fSLars Ellenberg continue; 1111615e087fSLars Ellenberg kref_get(&mdev->kref); 1112615e087fSLars Ellenberg rcu_read_unlock(); 11134b0007c0SPhilipp Reisner 1114615e087fSLars Ellenberg rv = blkdev_issue_flush(mdev->ldev->backing_bdev, 1115615e087fSLars Ellenberg GFP_NOIO, NULL); 1116b411b363SPhilipp Reisner if (rv) { 1117a67b813cSPhilipp Reisner dev_info(DEV, "local disk flush failed with status %d\n", rv); 1118b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 1119b411b363SPhilipp Reisner * don't try again for ANY return value != 0 1120b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 11214b0007c0SPhilipp Reisner drbd_bump_write_ordering(tconn, WO_drain_io); 1122615e087fSLars Ellenberg } 1123615e087fSLars Ellenberg put_ldev(mdev); 1124615e087fSLars Ellenberg kref_put(&mdev->kref, &drbd_minor_destroy); 1125615e087fSLars Ellenberg 1126615e087fSLars Ellenberg rcu_read_lock(); 1127615e087fSLars Ellenberg if (rv) 11284b0007c0SPhilipp Reisner break; 1129b411b363SPhilipp Reisner } 1130615e087fSLars Ellenberg rcu_read_unlock(); 1131b411b363SPhilipp Reisner } 1132b411b363SPhilipp Reisner } 1133b411b363SPhilipp Reisner 1134b411b363SPhilipp Reisner /** 1135b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 1136b411b363SPhilipp Reisner * @mdev: DRBD device. 1137b411b363SPhilipp Reisner * @epoch: Epoch object. 1138b411b363SPhilipp Reisner * @ev: Epoch event. 1139b411b363SPhilipp Reisner */ 11401e9dd291SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_tconn *tconn, 1141b411b363SPhilipp Reisner struct drbd_epoch *epoch, 1142b411b363SPhilipp Reisner enum epoch_event ev) 1143b411b363SPhilipp Reisner { 11442451fc3bSPhilipp Reisner int epoch_size; 1145b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 1146b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 1147b411b363SPhilipp Reisner 114812038a3aSPhilipp Reisner spin_lock(&tconn->epoch_lock); 1149b411b363SPhilipp Reisner do { 1150b411b363SPhilipp Reisner next_epoch = NULL; 1151b411b363SPhilipp Reisner 1152b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 1153b411b363SPhilipp Reisner 1154b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 1155b411b363SPhilipp Reisner case EV_PUT: 1156b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1157b411b363SPhilipp Reisner break; 1158b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1159b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1160b411b363SPhilipp Reisner break; 1161b411b363SPhilipp Reisner case EV_BECAME_LAST: 1162b411b363SPhilipp Reisner /* nothing to do*/ 1163b411b363SPhilipp Reisner break; 1164b411b363SPhilipp Reisner } 1165b411b363SPhilipp Reisner 1166b411b363SPhilipp Reisner if (epoch_size != 0 && 1167b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 116885d73513SPhilipp Reisner (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { 1169b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 117012038a3aSPhilipp Reisner spin_unlock(&tconn->epoch_lock); 11711d2783d5SPhilipp Reisner drbd_send_b_ack(epoch->mdev, epoch->barrier_nr, epoch_size); 117212038a3aSPhilipp Reisner spin_lock(&tconn->epoch_lock); 1173b411b363SPhilipp Reisner } 117485d73513SPhilipp Reisner if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) 11751d2783d5SPhilipp Reisner dec_unacked(epoch->mdev); 1176b411b363SPhilipp Reisner 117712038a3aSPhilipp Reisner if (tconn->current_epoch != epoch) { 1178b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1179b411b363SPhilipp Reisner list_del(&epoch->list); 1180b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 118112038a3aSPhilipp Reisner tconn->epochs--; 1182b411b363SPhilipp Reisner kfree(epoch); 1183b411b363SPhilipp Reisner 1184b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1185b411b363SPhilipp Reisner rv = FE_DESTROYED; 1186b411b363SPhilipp Reisner } else { 1187b411b363SPhilipp Reisner epoch->flags = 0; 1188b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1189698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1190b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1191b411b363SPhilipp Reisner rv = FE_RECYCLED; 1192b411b363SPhilipp Reisner } 1193b411b363SPhilipp Reisner } 1194b411b363SPhilipp Reisner 1195b411b363SPhilipp Reisner if (!next_epoch) 1196b411b363SPhilipp Reisner break; 1197b411b363SPhilipp Reisner 1198b411b363SPhilipp Reisner epoch = next_epoch; 1199b411b363SPhilipp Reisner } while (1); 1200b411b363SPhilipp Reisner 120112038a3aSPhilipp Reisner spin_unlock(&tconn->epoch_lock); 1202b411b363SPhilipp Reisner 1203b411b363SPhilipp Reisner return rv; 1204b411b363SPhilipp Reisner } 1205b411b363SPhilipp Reisner 1206b411b363SPhilipp Reisner /** 1207b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 12084b0007c0SPhilipp Reisner * @tconn: DRBD connection. 1209b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1210b411b363SPhilipp Reisner */ 12114b0007c0SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_tconn *tconn, enum write_ordering_e wo) 1212b411b363SPhilipp Reisner { 1213daeda1ccSPhilipp Reisner struct disk_conf *dc; 12144b0007c0SPhilipp Reisner struct drbd_conf *mdev; 1215b411b363SPhilipp Reisner enum write_ordering_e pwo; 12164b0007c0SPhilipp Reisner int vnr; 1217b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1218b411b363SPhilipp Reisner [WO_none] = "none", 1219b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1220b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1221b411b363SPhilipp Reisner }; 1222b411b363SPhilipp Reisner 12234b0007c0SPhilipp Reisner pwo = tconn->write_ordering; 1224b411b363SPhilipp Reisner wo = min(pwo, wo); 1225daeda1ccSPhilipp Reisner rcu_read_lock(); 12264b0007c0SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 12274b0007c0SPhilipp Reisner if (!get_ldev(mdev)) 12284b0007c0SPhilipp Reisner continue; 1229daeda1ccSPhilipp Reisner dc = rcu_dereference(mdev->ldev->disk_conf); 1230daeda1ccSPhilipp Reisner 123166b2f6b9SAndreas Gruenbacher if (wo == WO_bdev_flush && !dc->disk_flushes) 1232b411b363SPhilipp Reisner wo = WO_drain_io; 1233d0c980e2SAndreas Gruenbacher if (wo == WO_drain_io && !dc->disk_drain) 1234b411b363SPhilipp Reisner wo = WO_none; 12354b0007c0SPhilipp Reisner put_ldev(mdev); 12364b0007c0SPhilipp Reisner } 1237daeda1ccSPhilipp Reisner rcu_read_unlock(); 12384b0007c0SPhilipp Reisner tconn->write_ordering = wo; 12394b0007c0SPhilipp Reisner if (pwo != tconn->write_ordering || wo == WO_bdev_flush) 12404b0007c0SPhilipp Reisner conn_info(tconn, "Method to ensure write ordering: %s\n", write_ordering_str[tconn->write_ordering]); 1241b411b363SPhilipp Reisner } 1242b411b363SPhilipp Reisner 1243b411b363SPhilipp Reisner /** 1244fbe29decSAndreas Gruenbacher * drbd_submit_peer_request() 124545bb912bSLars Ellenberg * @mdev: DRBD device. 1246db830c46SAndreas Gruenbacher * @peer_req: peer request 124745bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 124810f6d992SLars Ellenberg * 124910f6d992SLars Ellenberg * May spread the pages to multiple bios, 125010f6d992SLars Ellenberg * depending on bio_add_page restrictions. 125110f6d992SLars Ellenberg * 125210f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 125310f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 125410f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 125510f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 125610f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 125710f6d992SLars Ellenberg * on certain Xen deployments. 125845bb912bSLars Ellenberg */ 125945bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 1260fbe29decSAndreas Gruenbacher int drbd_submit_peer_request(struct drbd_conf *mdev, 1261fbe29decSAndreas Gruenbacher struct drbd_peer_request *peer_req, 126245bb912bSLars Ellenberg const unsigned rw, const int fault_type) 126345bb912bSLars Ellenberg { 126445bb912bSLars Ellenberg struct bio *bios = NULL; 126545bb912bSLars Ellenberg struct bio *bio; 1266db830c46SAndreas Gruenbacher struct page *page = peer_req->pages; 1267db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1268db830c46SAndreas Gruenbacher unsigned ds = peer_req->i.size; 126945bb912bSLars Ellenberg unsigned n_bios = 0; 127045bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 127110f6d992SLars Ellenberg int err = -ENOMEM; 127245bb912bSLars Ellenberg 127345bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 127445bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 127545bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 1276da4a75d2SLars Ellenberg * request in more than one bio. 1277da4a75d2SLars Ellenberg * 1278da4a75d2SLars Ellenberg * Plain bio_alloc is good enough here, this is no DRBD internally 1279da4a75d2SLars Ellenberg * generated bio, but a bio allocated on behalf of the peer. 1280da4a75d2SLars Ellenberg */ 128145bb912bSLars Ellenberg next_bio: 128245bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 128345bb912bSLars Ellenberg if (!bio) { 128445bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 128545bb912bSLars Ellenberg goto fail; 128645bb912bSLars Ellenberg } 1287db830c46SAndreas Gruenbacher /* > peer_req->i.sector, unless this is the first bio */ 128845bb912bSLars Ellenberg bio->bi_sector = sector; 128945bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 129045bb912bSLars Ellenberg bio->bi_rw = rw; 1291db830c46SAndreas Gruenbacher bio->bi_private = peer_req; 1292fcefa62eSAndreas Gruenbacher bio->bi_end_io = drbd_peer_request_endio; 129345bb912bSLars Ellenberg 129445bb912bSLars Ellenberg bio->bi_next = bios; 129545bb912bSLars Ellenberg bios = bio; 129645bb912bSLars Ellenberg ++n_bios; 129745bb912bSLars Ellenberg 129845bb912bSLars Ellenberg page_chain_for_each(page) { 129945bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 130045bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 130110f6d992SLars Ellenberg /* A single page must always be possible! 130210f6d992SLars Ellenberg * But in case it fails anyways, 130310f6d992SLars Ellenberg * we deal with it, and complain (below). */ 130410f6d992SLars Ellenberg if (bio->bi_vcnt == 0) { 130510f6d992SLars Ellenberg dev_err(DEV, 130610f6d992SLars Ellenberg "bio_add_page failed for len=%u, " 130710f6d992SLars Ellenberg "bi_vcnt=0 (bi_sector=%llu)\n", 130810f6d992SLars Ellenberg len, (unsigned long long)bio->bi_sector); 130910f6d992SLars Ellenberg err = -ENOSPC; 131010f6d992SLars Ellenberg goto fail; 131110f6d992SLars Ellenberg } 131245bb912bSLars Ellenberg goto next_bio; 131345bb912bSLars Ellenberg } 131445bb912bSLars Ellenberg ds -= len; 131545bb912bSLars Ellenberg sector += len >> 9; 131645bb912bSLars Ellenberg --nr_pages; 131745bb912bSLars Ellenberg } 131845bb912bSLars Ellenberg D_ASSERT(page == NULL); 131945bb912bSLars Ellenberg D_ASSERT(ds == 0); 132045bb912bSLars Ellenberg 1321db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, n_bios); 132245bb912bSLars Ellenberg do { 132345bb912bSLars Ellenberg bio = bios; 132445bb912bSLars Ellenberg bios = bios->bi_next; 132545bb912bSLars Ellenberg bio->bi_next = NULL; 132645bb912bSLars Ellenberg 132745bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 132845bb912bSLars Ellenberg } while (bios); 132945bb912bSLars Ellenberg return 0; 133045bb912bSLars Ellenberg 133145bb912bSLars Ellenberg fail: 133245bb912bSLars Ellenberg while (bios) { 133345bb912bSLars Ellenberg bio = bios; 133445bb912bSLars Ellenberg bios = bios->bi_next; 133545bb912bSLars Ellenberg bio_put(bio); 133645bb912bSLars Ellenberg } 133710f6d992SLars Ellenberg return err; 133845bb912bSLars Ellenberg } 133945bb912bSLars Ellenberg 134053840641SAndreas Gruenbacher static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, 1341db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req) 134253840641SAndreas Gruenbacher { 1343db830c46SAndreas Gruenbacher struct drbd_interval *i = &peer_req->i; 134453840641SAndreas Gruenbacher 134553840641SAndreas Gruenbacher drbd_remove_interval(&mdev->write_requests, i); 134653840641SAndreas Gruenbacher drbd_clear_interval(i); 134753840641SAndreas Gruenbacher 13486c852becSAndreas Gruenbacher /* Wake up any processes waiting for this peer request to complete. */ 134953840641SAndreas Gruenbacher if (i->waiting) 135053840641SAndreas Gruenbacher wake_up(&mdev->misc_wait); 135153840641SAndreas Gruenbacher } 135253840641SAndreas Gruenbacher 135377fede51SPhilipp Reisner void conn_wait_active_ee_empty(struct drbd_tconn *tconn) 135477fede51SPhilipp Reisner { 135577fede51SPhilipp Reisner struct drbd_conf *mdev; 135677fede51SPhilipp Reisner int vnr; 135777fede51SPhilipp Reisner 135877fede51SPhilipp Reisner rcu_read_lock(); 135977fede51SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 136077fede51SPhilipp Reisner kref_get(&mdev->kref); 136177fede51SPhilipp Reisner rcu_read_unlock(); 136277fede51SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 136377fede51SPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 136477fede51SPhilipp Reisner rcu_read_lock(); 136577fede51SPhilipp Reisner } 136677fede51SPhilipp Reisner rcu_read_unlock(); 136777fede51SPhilipp Reisner } 136877fede51SPhilipp Reisner 13694a76b161SAndreas Gruenbacher static int receive_Barrier(struct drbd_tconn *tconn, struct packet_info *pi) 1370b411b363SPhilipp Reisner { 13714a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 13722451fc3bSPhilipp Reisner int rv; 1373e658983aSAndreas Gruenbacher struct p_barrier *p = pi->data; 1374b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1375b411b363SPhilipp Reisner 13764a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 13774a76b161SAndreas Gruenbacher if (!mdev) 13784a76b161SAndreas Gruenbacher return -EIO; 13794a76b161SAndreas Gruenbacher 1380b411b363SPhilipp Reisner inc_unacked(mdev); 1381b411b363SPhilipp Reisner 138212038a3aSPhilipp Reisner tconn->current_epoch->barrier_nr = p->barrier; 138312038a3aSPhilipp Reisner tconn->current_epoch->mdev = mdev; 13841e9dd291SPhilipp Reisner rv = drbd_may_finish_epoch(tconn, tconn->current_epoch, EV_GOT_BARRIER_NR); 1385b411b363SPhilipp Reisner 1386b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1387b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1388b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1389b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1390b411b363SPhilipp Reisner * completed. */ 13914b0007c0SPhilipp Reisner switch (tconn->write_ordering) { 1392b411b363SPhilipp Reisner case WO_none: 1393b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 139482bc0194SAndreas Gruenbacher return 0; 1395b411b363SPhilipp Reisner 1396b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1397b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1398b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 13992451fc3bSPhilipp Reisner if (epoch) 14002451fc3bSPhilipp Reisner break; 14012451fc3bSPhilipp Reisner else 1402b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 14032451fc3bSPhilipp Reisner /* Fall through */ 14042451fc3bSPhilipp Reisner 14052451fc3bSPhilipp Reisner case WO_bdev_flush: 14062451fc3bSPhilipp Reisner case WO_drain_io: 140777fede51SPhilipp Reisner conn_wait_active_ee_empty(tconn); 14084b0007c0SPhilipp Reisner drbd_flush(tconn); 14092451fc3bSPhilipp Reisner 141012038a3aSPhilipp Reisner if (atomic_read(&tconn->current_epoch->epoch_size)) { 14112451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 14122451fc3bSPhilipp Reisner if (epoch) 14132451fc3bSPhilipp Reisner break; 1414b411b363SPhilipp Reisner } 1415b411b363SPhilipp Reisner 141612038a3aSPhilipp Reisner epoch = tconn->current_epoch; 14172451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 14182451fc3bSPhilipp Reisner 14192451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 14202451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1421b411b363SPhilipp Reisner 142282bc0194SAndreas Gruenbacher return 0; 14232451fc3bSPhilipp Reisner default: 14244b0007c0SPhilipp Reisner dev_err(DEV, "Strangeness in tconn->write_ordering %d\n", tconn->write_ordering); 142582bc0194SAndreas Gruenbacher return -EIO; 1426b411b363SPhilipp Reisner } 1427b411b363SPhilipp Reisner 1428b411b363SPhilipp Reisner epoch->flags = 0; 1429b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1430b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1431b411b363SPhilipp Reisner 143212038a3aSPhilipp Reisner spin_lock(&tconn->epoch_lock); 143312038a3aSPhilipp Reisner if (atomic_read(&tconn->current_epoch->epoch_size)) { 143412038a3aSPhilipp Reisner list_add(&epoch->list, &tconn->current_epoch->list); 143512038a3aSPhilipp Reisner tconn->current_epoch = epoch; 143612038a3aSPhilipp Reisner tconn->epochs++; 1437b411b363SPhilipp Reisner } else { 1438b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1439b411b363SPhilipp Reisner kfree(epoch); 1440b411b363SPhilipp Reisner } 144112038a3aSPhilipp Reisner spin_unlock(&tconn->epoch_lock); 1442b411b363SPhilipp Reisner 144382bc0194SAndreas Gruenbacher return 0; 1444b411b363SPhilipp Reisner } 1445b411b363SPhilipp Reisner 1446b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1447b411b363SPhilipp Reisner * and from receive_Data */ 1448f6ffca9fSAndreas Gruenbacher static struct drbd_peer_request * 1449f6ffca9fSAndreas Gruenbacher read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, 1450f6ffca9fSAndreas Gruenbacher int data_size) __must_hold(local) 1451b411b363SPhilipp Reisner { 14526666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1453db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1454b411b363SPhilipp Reisner struct page *page; 1455a5c31904SAndreas Gruenbacher int dgs, ds, err; 1456a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1457a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 14586b4388acSPhilipp Reisner unsigned long *data; 1459b411b363SPhilipp Reisner 146088104ca4SAndreas Gruenbacher dgs = 0; 146188104ca4SAndreas Gruenbacher if (mdev->tconn->peer_integrity_tfm) { 146288104ca4SAndreas Gruenbacher dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); 14639f5bdc33SAndreas Gruenbacher /* 14649f5bdc33SAndreas Gruenbacher * FIXME: Receive the incoming digest into the receive buffer 14659f5bdc33SAndreas Gruenbacher * here, together with its struct p_data? 14669f5bdc33SAndreas Gruenbacher */ 1467a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1468a5c31904SAndreas Gruenbacher if (err) 1469b411b363SPhilipp Reisner return NULL; 1470b411b363SPhilipp Reisner data_size -= dgs; 147188104ca4SAndreas Gruenbacher } 1472b411b363SPhilipp Reisner 1473841ce241SAndreas Gruenbacher if (!expect(data_size != 0)) 1474841ce241SAndreas Gruenbacher return NULL; 1475841ce241SAndreas Gruenbacher if (!expect(IS_ALIGNED(data_size, 512))) 1476841ce241SAndreas Gruenbacher return NULL; 1477841ce241SAndreas Gruenbacher if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) 1478841ce241SAndreas Gruenbacher return NULL; 1479b411b363SPhilipp Reisner 14806666032aSLars Ellenberg /* even though we trust out peer, 14816666032aSLars Ellenberg * we sometimes have to double check. */ 14826666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1483fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1484fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 14856666032aSLars Ellenberg (unsigned long long)capacity, 14866666032aSLars Ellenberg (unsigned long long)sector, data_size); 14876666032aSLars Ellenberg return NULL; 14886666032aSLars Ellenberg } 14896666032aSLars Ellenberg 1490b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1491b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1492b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 14930db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, id, sector, data_size, GFP_NOIO); 1494db830c46SAndreas Gruenbacher if (!peer_req) 1495b411b363SPhilipp Reisner return NULL; 149645bb912bSLars Ellenberg 1497b411b363SPhilipp Reisner ds = data_size; 1498db830c46SAndreas Gruenbacher page = peer_req->pages; 149945bb912bSLars Ellenberg page_chain_for_each(page) { 150045bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 15016b4388acSPhilipp Reisner data = kmap(page); 1502a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 15030cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 15046b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 15056b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 15066b4388acSPhilipp Reisner } 1507b411b363SPhilipp Reisner kunmap(page); 1508a5c31904SAndreas Gruenbacher if (err) { 15093967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1510b411b363SPhilipp Reisner return NULL; 1511b411b363SPhilipp Reisner } 1512a5c31904SAndreas Gruenbacher ds -= len; 1513b411b363SPhilipp Reisner } 1514b411b363SPhilipp Reisner 1515b411b363SPhilipp Reisner if (dgs) { 15165b614abeSAndreas Gruenbacher drbd_csum_ee(mdev, mdev->tconn->peer_integrity_tfm, peer_req, dig_vv); 1517b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1518470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1519470be44aSLars Ellenberg (unsigned long long)sector, data_size); 15203967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1521b411b363SPhilipp Reisner return NULL; 1522b411b363SPhilipp Reisner } 1523b411b363SPhilipp Reisner } 1524b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1525db830c46SAndreas Gruenbacher return peer_req; 1526b411b363SPhilipp Reisner } 1527b411b363SPhilipp Reisner 1528b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1529b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1530b411b363SPhilipp Reisner */ 1531b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1532b411b363SPhilipp Reisner { 1533b411b363SPhilipp Reisner struct page *page; 1534a5c31904SAndreas Gruenbacher int err = 0; 1535b411b363SPhilipp Reisner void *data; 1536b411b363SPhilipp Reisner 1537c3470cdeSLars Ellenberg if (!data_size) 1538fc5be839SAndreas Gruenbacher return 0; 1539c3470cdeSLars Ellenberg 1540c37c8ecfSAndreas Gruenbacher page = drbd_alloc_pages(mdev, 1, 1); 1541b411b363SPhilipp Reisner 1542b411b363SPhilipp Reisner data = kmap(page); 1543b411b363SPhilipp Reisner while (data_size) { 1544fc5be839SAndreas Gruenbacher unsigned int len = min_t(int, data_size, PAGE_SIZE); 1545fc5be839SAndreas Gruenbacher 1546a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 1547a5c31904SAndreas Gruenbacher if (err) 1548b411b363SPhilipp Reisner break; 1549a5c31904SAndreas Gruenbacher data_size -= len; 1550b411b363SPhilipp Reisner } 1551b411b363SPhilipp Reisner kunmap(page); 15525cc287e0SAndreas Gruenbacher drbd_free_pages(mdev, page, 0); 1553fc5be839SAndreas Gruenbacher return err; 1554b411b363SPhilipp Reisner } 1555b411b363SPhilipp Reisner 1556b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1557b411b363SPhilipp Reisner sector_t sector, int data_size) 1558b411b363SPhilipp Reisner { 1559b411b363SPhilipp Reisner struct bio_vec *bvec; 1560b411b363SPhilipp Reisner struct bio *bio; 1561a5c31904SAndreas Gruenbacher int dgs, err, i, expect; 1562a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1563a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 1564b411b363SPhilipp Reisner 156588104ca4SAndreas Gruenbacher dgs = 0; 156688104ca4SAndreas Gruenbacher if (mdev->tconn->peer_integrity_tfm) { 156788104ca4SAndreas Gruenbacher dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); 1568a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1569a5c31904SAndreas Gruenbacher if (err) 1570a5c31904SAndreas Gruenbacher return err; 1571b411b363SPhilipp Reisner data_size -= dgs; 157288104ca4SAndreas Gruenbacher } 1573b411b363SPhilipp Reisner 1574b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1575b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1576b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1577b411b363SPhilipp Reisner 1578b411b363SPhilipp Reisner bio = req->master_bio; 1579b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1580b411b363SPhilipp Reisner 1581b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1582a5c31904SAndreas Gruenbacher void *mapped = kmap(bvec->bv_page) + bvec->bv_offset; 1583b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1584a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, mapped, expect); 1585b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1586a5c31904SAndreas Gruenbacher if (err) 1587a5c31904SAndreas Gruenbacher return err; 1588a5c31904SAndreas Gruenbacher data_size -= expect; 1589b411b363SPhilipp Reisner } 1590b411b363SPhilipp Reisner 1591b411b363SPhilipp Reisner if (dgs) { 15925b614abeSAndreas Gruenbacher drbd_csum_bio(mdev, mdev->tconn->peer_integrity_tfm, bio, dig_vv); 1593b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1594b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 159528284cefSAndreas Gruenbacher return -EINVAL; 1596b411b363SPhilipp Reisner } 1597b411b363SPhilipp Reisner } 1598b411b363SPhilipp Reisner 1599b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 160028284cefSAndreas Gruenbacher return 0; 1601b411b363SPhilipp Reisner } 1602b411b363SPhilipp Reisner 1603a990be46SAndreas Gruenbacher /* 1604a990be46SAndreas Gruenbacher * e_end_resync_block() is called in asender context via 1605a990be46SAndreas Gruenbacher * drbd_finish_peer_reqs(). 1606a990be46SAndreas Gruenbacher */ 160799920dc5SAndreas Gruenbacher static int e_end_resync_block(struct drbd_work *w, int unused) 1608b411b363SPhilipp Reisner { 16098050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 16108050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 161100d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1612db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 161399920dc5SAndreas Gruenbacher int err; 1614b411b363SPhilipp Reisner 1615db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1616b411b363SPhilipp Reisner 1617db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1618db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 161999920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); 1620b411b363SPhilipp Reisner } else { 1621b411b363SPhilipp Reisner /* Record failure to sync */ 1622db830c46SAndreas Gruenbacher drbd_rs_failed_io(mdev, sector, peer_req->i.size); 1623b411b363SPhilipp Reisner 162499920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1625b411b363SPhilipp Reisner } 1626b411b363SPhilipp Reisner dec_unacked(mdev); 1627b411b363SPhilipp Reisner 162899920dc5SAndreas Gruenbacher return err; 1629b411b363SPhilipp Reisner } 1630b411b363SPhilipp Reisner 1631b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1632b411b363SPhilipp Reisner { 1633db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1634b411b363SPhilipp Reisner 1635db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); 1636db830c46SAndreas Gruenbacher if (!peer_req) 163745bb912bSLars Ellenberg goto fail; 1638b411b363SPhilipp Reisner 1639b411b363SPhilipp Reisner dec_rs_pending(mdev); 1640b411b363SPhilipp Reisner 1641b411b363SPhilipp Reisner inc_unacked(mdev); 1642b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1643b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1644b411b363SPhilipp Reisner 1645db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_resync_block; 164645bb912bSLars Ellenberg 164787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1648db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->sync_ee); 164987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1650b411b363SPhilipp Reisner 16510f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 1652fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) 1653e1c1b0fcSAndreas Gruenbacher return 0; 165445bb912bSLars Ellenberg 165510f6d992SLars Ellenberg /* don't care for the reason here */ 165610f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 165787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1658db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 165987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 166022cc37a9SLars Ellenberg 16613967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 166245bb912bSLars Ellenberg fail: 166345bb912bSLars Ellenberg put_ldev(mdev); 1664e1c1b0fcSAndreas Gruenbacher return -EIO; 1665b411b363SPhilipp Reisner } 1666b411b363SPhilipp Reisner 1667668eebc6SAndreas Gruenbacher static struct drbd_request * 1668bc9c5c41SAndreas Gruenbacher find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, 1669bc9c5c41SAndreas Gruenbacher sector_t sector, bool missing_ok, const char *func) 1670668eebc6SAndreas Gruenbacher { 1671668eebc6SAndreas Gruenbacher struct drbd_request *req; 1672668eebc6SAndreas Gruenbacher 1673bc9c5c41SAndreas Gruenbacher /* Request object according to our peer */ 1674bc9c5c41SAndreas Gruenbacher req = (struct drbd_request *)(unsigned long)id; 16755e472264SAndreas Gruenbacher if (drbd_contains_interval(root, sector, &req->i) && req->i.local) 1676668eebc6SAndreas Gruenbacher return req; 1677c3afd8f5SAndreas Gruenbacher if (!missing_ok) { 16785af172edSAndreas Gruenbacher dev_err(DEV, "%s: failed to find request 0x%lx, sector %llus\n", func, 1679c3afd8f5SAndreas Gruenbacher (unsigned long)id, (unsigned long long)sector); 1680c3afd8f5SAndreas Gruenbacher } 1681668eebc6SAndreas Gruenbacher return NULL; 1682668eebc6SAndreas Gruenbacher } 1683668eebc6SAndreas Gruenbacher 16844a76b161SAndreas Gruenbacher static int receive_DataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1685b411b363SPhilipp Reisner { 16864a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1687b411b363SPhilipp Reisner struct drbd_request *req; 1688b411b363SPhilipp Reisner sector_t sector; 168982bc0194SAndreas Gruenbacher int err; 1690e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 16914a76b161SAndreas Gruenbacher 16924a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 16934a76b161SAndreas Gruenbacher if (!mdev) 16944a76b161SAndreas Gruenbacher return -EIO; 1695b411b363SPhilipp Reisner 1696b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1697b411b363SPhilipp Reisner 169887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1699bc9c5c41SAndreas Gruenbacher req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); 170087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1701c3afd8f5SAndreas Gruenbacher if (unlikely(!req)) 170282bc0194SAndreas Gruenbacher return -EIO; 1703b411b363SPhilipp Reisner 170424c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1705b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1706b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1707e2857216SAndreas Gruenbacher err = recv_dless_read(mdev, req, sector, pi->size); 170882bc0194SAndreas Gruenbacher if (!err) 17098554df1cSAndreas Gruenbacher req_mod(req, DATA_RECEIVED); 1710b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1711b411b363SPhilipp Reisner * I don't think we may complete this just yet 1712b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1713b411b363SPhilipp Reisner 171482bc0194SAndreas Gruenbacher return err; 1715b411b363SPhilipp Reisner } 1716b411b363SPhilipp Reisner 17174a76b161SAndreas Gruenbacher static int receive_RSDataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1718b411b363SPhilipp Reisner { 17194a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1720b411b363SPhilipp Reisner sector_t sector; 172182bc0194SAndreas Gruenbacher int err; 1722e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 17234a76b161SAndreas Gruenbacher 17244a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 17254a76b161SAndreas Gruenbacher if (!mdev) 17264a76b161SAndreas Gruenbacher return -EIO; 1727b411b363SPhilipp Reisner 1728b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1729b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1730b411b363SPhilipp Reisner 1731b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1732b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1733b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1734fcefa62eSAndreas Gruenbacher * or in drbd_peer_request_endio. */ 1735e2857216SAndreas Gruenbacher err = recv_resync_read(mdev, sector, pi->size); 1736b411b363SPhilipp Reisner } else { 1737b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1738b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1739b411b363SPhilipp Reisner 1740e2857216SAndreas Gruenbacher err = drbd_drain_block(mdev, pi->size); 1741b411b363SPhilipp Reisner 1742e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 1743b411b363SPhilipp Reisner } 1744b411b363SPhilipp Reisner 1745e2857216SAndreas Gruenbacher atomic_add(pi->size >> 9, &mdev->rs_sect_in); 1746778f271dSPhilipp Reisner 174782bc0194SAndreas Gruenbacher return err; 1748b411b363SPhilipp Reisner } 1749b411b363SPhilipp Reisner 175099920dc5SAndreas Gruenbacher static int w_restart_write(struct drbd_work *w, int cancel) 17517be8da07SAndreas Gruenbacher { 17527be8da07SAndreas Gruenbacher struct drbd_request *req = container_of(w, struct drbd_request, w); 17537be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 17547be8da07SAndreas Gruenbacher struct bio *bio; 17557be8da07SAndreas Gruenbacher unsigned long start_time; 17567be8da07SAndreas Gruenbacher unsigned long flags; 17577be8da07SAndreas Gruenbacher 17587be8da07SAndreas Gruenbacher spin_lock_irqsave(&mdev->tconn->req_lock, flags); 17597be8da07SAndreas Gruenbacher if (!expect(req->rq_state & RQ_POSTPONED)) { 17607be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 176199920dc5SAndreas Gruenbacher return -EIO; 17627be8da07SAndreas Gruenbacher } 17637be8da07SAndreas Gruenbacher bio = req->master_bio; 17647be8da07SAndreas Gruenbacher start_time = req->start_time; 17657be8da07SAndreas Gruenbacher /* Postponed requests will not have their master_bio completed! */ 17667be8da07SAndreas Gruenbacher __req_mod(req, DISCARD_WRITE, NULL); 17677be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 17687be8da07SAndreas Gruenbacher 17697be8da07SAndreas Gruenbacher while (__drbd_make_request(mdev, bio, start_time)) 17707be8da07SAndreas Gruenbacher /* retry */ ; 177199920dc5SAndreas Gruenbacher return 0; 17727be8da07SAndreas Gruenbacher } 17737be8da07SAndreas Gruenbacher 17747be8da07SAndreas Gruenbacher static void restart_conflicting_writes(struct drbd_conf *mdev, 17757be8da07SAndreas Gruenbacher sector_t sector, int size) 17767be8da07SAndreas Gruenbacher { 17777be8da07SAndreas Gruenbacher struct drbd_interval *i; 17787be8da07SAndreas Gruenbacher struct drbd_request *req; 17797be8da07SAndreas Gruenbacher 17807be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 17817be8da07SAndreas Gruenbacher if (!i->local) 17827be8da07SAndreas Gruenbacher continue; 17837be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 17847be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 17857be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) 17867be8da07SAndreas Gruenbacher continue; 17877be8da07SAndreas Gruenbacher if (expect(list_empty(&req->w.list))) { 17887be8da07SAndreas Gruenbacher req->w.mdev = mdev; 17897be8da07SAndreas Gruenbacher req->w.cb = w_restart_write; 17907be8da07SAndreas Gruenbacher drbd_queue_work(&mdev->tconn->data.work, &req->w); 17917be8da07SAndreas Gruenbacher } 17927be8da07SAndreas Gruenbacher } 17937be8da07SAndreas Gruenbacher } 17947be8da07SAndreas Gruenbacher 1795a990be46SAndreas Gruenbacher /* 1796a990be46SAndreas Gruenbacher * e_end_block() is called in asender context via drbd_finish_peer_reqs(). 1797b411b363SPhilipp Reisner */ 179899920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *w, int cancel) 1799b411b363SPhilipp Reisner { 18008050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 18018050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 180200d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1803db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 180499920dc5SAndreas Gruenbacher int err = 0, pcmd; 1805b411b363SPhilipp Reisner 1806303d1448SPhilipp Reisner if (peer_req->flags & EE_SEND_WRITE_ACK) { 1807db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1808b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1809b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1810db830c46SAndreas Gruenbacher peer_req->flags & EE_MAY_SET_IN_SYNC) ? 1811b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 181299920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, pcmd, peer_req); 1813b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1814db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 1815b411b363SPhilipp Reisner } else { 181699920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1817b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1818b411b363SPhilipp Reisner * maybe assert this? */ 1819b411b363SPhilipp Reisner } 1820b411b363SPhilipp Reisner dec_unacked(mdev); 1821b411b363SPhilipp Reisner } 1822b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1823b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 1824302bdeaeSPhilipp Reisner if (peer_req->flags & EE_IN_INTERVAL_TREE) { 182587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1826db830c46SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&peer_req->i)); 1827db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 18287be8da07SAndreas Gruenbacher if (peer_req->flags & EE_RESTART_REQUESTS) 18297be8da07SAndreas Gruenbacher restart_conflicting_writes(mdev, sector, peer_req->i.size); 183087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1831bb3bfe96SAndreas Gruenbacher } else 1832db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1833b411b363SPhilipp Reisner 18341e9dd291SPhilipp Reisner drbd_may_finish_epoch(mdev->tconn, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1835b411b363SPhilipp Reisner 183699920dc5SAndreas Gruenbacher return err; 1837b411b363SPhilipp Reisner } 1838b411b363SPhilipp Reisner 18397be8da07SAndreas Gruenbacher static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) 1840b411b363SPhilipp Reisner { 18417be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 18428050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 18438050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 184499920dc5SAndreas Gruenbacher int err; 1845b411b363SPhilipp Reisner 184699920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, ack, peer_req); 1847b411b363SPhilipp Reisner dec_unacked(mdev); 1848b411b363SPhilipp Reisner 184999920dc5SAndreas Gruenbacher return err; 1850b411b363SPhilipp Reisner } 1851b411b363SPhilipp Reisner 185299920dc5SAndreas Gruenbacher static int e_send_discard_write(struct drbd_work *w, int unused) 18537be8da07SAndreas Gruenbacher { 18547be8da07SAndreas Gruenbacher return e_send_ack(w, P_DISCARD_WRITE); 18557be8da07SAndreas Gruenbacher } 18567be8da07SAndreas Gruenbacher 185799920dc5SAndreas Gruenbacher static int e_send_retry_write(struct drbd_work *w, int unused) 18587be8da07SAndreas Gruenbacher { 18597be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = w->mdev->tconn; 18607be8da07SAndreas Gruenbacher 18617be8da07SAndreas Gruenbacher return e_send_ack(w, tconn->agreed_pro_version >= 100 ? 18627be8da07SAndreas Gruenbacher P_RETRY_WRITE : P_DISCARD_WRITE); 18637be8da07SAndreas Gruenbacher } 18647be8da07SAndreas Gruenbacher 18653e394da1SAndreas Gruenbacher static bool seq_greater(u32 a, u32 b) 18663e394da1SAndreas Gruenbacher { 18673e394da1SAndreas Gruenbacher /* 18683e394da1SAndreas Gruenbacher * We assume 32-bit wrap-around here. 18693e394da1SAndreas Gruenbacher * For 24-bit wrap-around, we would have to shift: 18703e394da1SAndreas Gruenbacher * a <<= 8; b <<= 8; 18713e394da1SAndreas Gruenbacher */ 18723e394da1SAndreas Gruenbacher return (s32)a - (s32)b > 0; 18733e394da1SAndreas Gruenbacher } 18743e394da1SAndreas Gruenbacher 18753e394da1SAndreas Gruenbacher static u32 seq_max(u32 a, u32 b) 18763e394da1SAndreas Gruenbacher { 18773e394da1SAndreas Gruenbacher return seq_greater(a, b) ? a : b; 18783e394da1SAndreas Gruenbacher } 18793e394da1SAndreas Gruenbacher 18807be8da07SAndreas Gruenbacher static bool need_peer_seq(struct drbd_conf *mdev) 18817be8da07SAndreas Gruenbacher { 18827be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 1883302bdeaeSPhilipp Reisner int tp; 18847be8da07SAndreas Gruenbacher 18857be8da07SAndreas Gruenbacher /* 18867be8da07SAndreas Gruenbacher * We only need to keep track of the last packet_seq number of our peer 18877be8da07SAndreas Gruenbacher * if we are in dual-primary mode and we have the discard flag set; see 18887be8da07SAndreas Gruenbacher * handle_write_conflicts(). 18897be8da07SAndreas Gruenbacher */ 1890302bdeaeSPhilipp Reisner 1891302bdeaeSPhilipp Reisner rcu_read_lock(); 1892302bdeaeSPhilipp Reisner tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; 1893302bdeaeSPhilipp Reisner rcu_read_unlock(); 1894302bdeaeSPhilipp Reisner 1895302bdeaeSPhilipp Reisner return tp && test_bit(DISCARD_CONCURRENT, &tconn->flags); 18967be8da07SAndreas Gruenbacher } 18977be8da07SAndreas Gruenbacher 189843ae077dSAndreas Gruenbacher static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) 18993e394da1SAndreas Gruenbacher { 19003c13b680SLars Ellenberg unsigned int newest_peer_seq; 19013e394da1SAndreas Gruenbacher 19027be8da07SAndreas Gruenbacher if (need_peer_seq(mdev)) { 19033e394da1SAndreas Gruenbacher spin_lock(&mdev->peer_seq_lock); 19043c13b680SLars Ellenberg newest_peer_seq = seq_max(mdev->peer_seq, peer_seq); 19053c13b680SLars Ellenberg mdev->peer_seq = newest_peer_seq; 19063e394da1SAndreas Gruenbacher spin_unlock(&mdev->peer_seq_lock); 19073c13b680SLars Ellenberg /* wake up only if we actually changed mdev->peer_seq */ 19083c13b680SLars Ellenberg if (peer_seq == newest_peer_seq) 19093e394da1SAndreas Gruenbacher wake_up(&mdev->seq_wait); 19103e394da1SAndreas Gruenbacher } 19117be8da07SAndreas Gruenbacher } 19123e394da1SAndreas Gruenbacher 1913b411b363SPhilipp Reisner /* Called from receive_Data. 1914b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1915b411b363SPhilipp Reisner * 1916b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1917b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1918b411b363SPhilipp Reisner * been sent. 1919b411b363SPhilipp Reisner * 1920b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1921b411b363SPhilipp Reisner * 1922b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1923b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1924b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1925b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1926b411b363SPhilipp Reisner * 1927b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1928b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1929b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1930b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1931b411b363SPhilipp Reisner * 1932b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1933b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 19347be8da07SAndreas Gruenbacher static int wait_for_and_update_peer_seq(struct drbd_conf *mdev, const u32 peer_seq) 1935b411b363SPhilipp Reisner { 1936b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1937b411b363SPhilipp Reisner long timeout; 19387be8da07SAndreas Gruenbacher int ret; 19397be8da07SAndreas Gruenbacher 19407be8da07SAndreas Gruenbacher if (!need_peer_seq(mdev)) 19417be8da07SAndreas Gruenbacher return 0; 19427be8da07SAndreas Gruenbacher 1943b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1944b411b363SPhilipp Reisner for (;;) { 19457be8da07SAndreas Gruenbacher if (!seq_greater(peer_seq - 1, mdev->peer_seq)) { 19467be8da07SAndreas Gruenbacher mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); 19477be8da07SAndreas Gruenbacher ret = 0; 1948b411b363SPhilipp Reisner break; 19497be8da07SAndreas Gruenbacher } 1950b411b363SPhilipp Reisner if (signal_pending(current)) { 1951b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1952b411b363SPhilipp Reisner break; 1953b411b363SPhilipp Reisner } 19547be8da07SAndreas Gruenbacher prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1955b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 195644ed167dSPhilipp Reisner rcu_read_lock(); 195744ed167dSPhilipp Reisner timeout = rcu_dereference(mdev->tconn->net_conf)->ping_timeo*HZ/10; 195844ed167dSPhilipp Reisner rcu_read_unlock(); 195971b1c1ebSAndreas Gruenbacher timeout = schedule_timeout(timeout); 1960b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 19617be8da07SAndreas Gruenbacher if (!timeout) { 1962b411b363SPhilipp Reisner ret = -ETIMEDOUT; 196371b1c1ebSAndreas Gruenbacher dev_err(DEV, "Timed out waiting for missing ack packets; disconnecting\n"); 1964b411b363SPhilipp Reisner break; 1965b411b363SPhilipp Reisner } 1966b411b363SPhilipp Reisner } 1967b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 19687be8da07SAndreas Gruenbacher finish_wait(&mdev->seq_wait, &wait); 1969b411b363SPhilipp Reisner return ret; 1970b411b363SPhilipp Reisner } 1971b411b363SPhilipp Reisner 1972688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1973688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1974688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1975688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 197676d2e7ecSPhilipp Reisner { 197776d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 197876d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1979688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 198076d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 198176d2e7ecSPhilipp Reisner } 198276d2e7ecSPhilipp Reisner 19837be8da07SAndreas Gruenbacher static void fail_postponed_requests(struct drbd_conf *mdev, sector_t sector, 19847be8da07SAndreas Gruenbacher unsigned int size) 19857be8da07SAndreas Gruenbacher { 19867be8da07SAndreas Gruenbacher struct drbd_interval *i; 19877be8da07SAndreas Gruenbacher 19887be8da07SAndreas Gruenbacher repeat: 19897be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 19907be8da07SAndreas Gruenbacher struct drbd_request *req; 19917be8da07SAndreas Gruenbacher struct bio_and_error m; 19927be8da07SAndreas Gruenbacher 19937be8da07SAndreas Gruenbacher if (!i->local) 19947be8da07SAndreas Gruenbacher continue; 19957be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 19967be8da07SAndreas Gruenbacher if (!(req->rq_state & RQ_POSTPONED)) 19977be8da07SAndreas Gruenbacher continue; 19987be8da07SAndreas Gruenbacher req->rq_state &= ~RQ_POSTPONED; 19997be8da07SAndreas Gruenbacher __req_mod(req, NEG_ACKED, &m); 20007be8da07SAndreas Gruenbacher spin_unlock_irq(&mdev->tconn->req_lock); 20017be8da07SAndreas Gruenbacher if (m.bio) 20027be8da07SAndreas Gruenbacher complete_master_bio(mdev, &m); 20037be8da07SAndreas Gruenbacher spin_lock_irq(&mdev->tconn->req_lock); 20047be8da07SAndreas Gruenbacher goto repeat; 20057be8da07SAndreas Gruenbacher } 20067be8da07SAndreas Gruenbacher } 20077be8da07SAndreas Gruenbacher 20087be8da07SAndreas Gruenbacher static int handle_write_conflicts(struct drbd_conf *mdev, 20097be8da07SAndreas Gruenbacher struct drbd_peer_request *peer_req) 20107be8da07SAndreas Gruenbacher { 20117be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 20127be8da07SAndreas Gruenbacher bool resolve_conflicts = test_bit(DISCARD_CONCURRENT, &tconn->flags); 20137be8da07SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 20147be8da07SAndreas Gruenbacher const unsigned int size = peer_req->i.size; 20157be8da07SAndreas Gruenbacher struct drbd_interval *i; 20167be8da07SAndreas Gruenbacher bool equal; 20177be8da07SAndreas Gruenbacher int err; 20187be8da07SAndreas Gruenbacher 20197be8da07SAndreas Gruenbacher /* 20207be8da07SAndreas Gruenbacher * Inserting the peer request into the write_requests tree will prevent 20217be8da07SAndreas Gruenbacher * new conflicting local requests from being added. 20227be8da07SAndreas Gruenbacher */ 20237be8da07SAndreas Gruenbacher drbd_insert_interval(&mdev->write_requests, &peer_req->i); 20247be8da07SAndreas Gruenbacher 20257be8da07SAndreas Gruenbacher repeat: 20267be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 20277be8da07SAndreas Gruenbacher if (i == &peer_req->i) 20287be8da07SAndreas Gruenbacher continue; 20297be8da07SAndreas Gruenbacher 20307be8da07SAndreas Gruenbacher if (!i->local) { 20317be8da07SAndreas Gruenbacher /* 20327be8da07SAndreas Gruenbacher * Our peer has sent a conflicting remote request; this 20337be8da07SAndreas Gruenbacher * should not happen in a two-node setup. Wait for the 20347be8da07SAndreas Gruenbacher * earlier peer request to complete. 20357be8da07SAndreas Gruenbacher */ 20367be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, i); 20377be8da07SAndreas Gruenbacher if (err) 20387be8da07SAndreas Gruenbacher goto out; 20397be8da07SAndreas Gruenbacher goto repeat; 20407be8da07SAndreas Gruenbacher } 20417be8da07SAndreas Gruenbacher 20427be8da07SAndreas Gruenbacher equal = i->sector == sector && i->size == size; 20437be8da07SAndreas Gruenbacher if (resolve_conflicts) { 20447be8da07SAndreas Gruenbacher /* 20457be8da07SAndreas Gruenbacher * If the peer request is fully contained within the 20467be8da07SAndreas Gruenbacher * overlapping request, it can be discarded; otherwise, 20477be8da07SAndreas Gruenbacher * it will be retried once all overlapping requests 20487be8da07SAndreas Gruenbacher * have completed. 20497be8da07SAndreas Gruenbacher */ 20507be8da07SAndreas Gruenbacher bool discard = i->sector <= sector && i->sector + 20517be8da07SAndreas Gruenbacher (i->size >> 9) >= sector + (size >> 9); 20527be8da07SAndreas Gruenbacher 20537be8da07SAndreas Gruenbacher if (!equal) 20547be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 20557be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u, " 20567be8da07SAndreas Gruenbacher "assuming %s came first\n", 20577be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 20587be8da07SAndreas Gruenbacher (unsigned long long)sector, size, 20597be8da07SAndreas Gruenbacher discard ? "local" : "remote"); 20607be8da07SAndreas Gruenbacher 20617be8da07SAndreas Gruenbacher inc_unacked(mdev); 20627be8da07SAndreas Gruenbacher peer_req->w.cb = discard ? e_send_discard_write : 20637be8da07SAndreas Gruenbacher e_send_retry_write; 20647be8da07SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->done_ee); 20657be8da07SAndreas Gruenbacher wake_asender(mdev->tconn); 20667be8da07SAndreas Gruenbacher 20677be8da07SAndreas Gruenbacher err = -ENOENT; 20687be8da07SAndreas Gruenbacher goto out; 20697be8da07SAndreas Gruenbacher } else { 20707be8da07SAndreas Gruenbacher struct drbd_request *req = 20717be8da07SAndreas Gruenbacher container_of(i, struct drbd_request, i); 20727be8da07SAndreas Gruenbacher 20737be8da07SAndreas Gruenbacher if (!equal) 20747be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 20757be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u\n", 20767be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 20777be8da07SAndreas Gruenbacher (unsigned long long)sector, size); 20787be8da07SAndreas Gruenbacher 20797be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 20807be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) { 20817be8da07SAndreas Gruenbacher /* 20827be8da07SAndreas Gruenbacher * Wait for the node with the discard flag to 20837be8da07SAndreas Gruenbacher * decide if this request will be discarded or 20847be8da07SAndreas Gruenbacher * retried. Requests that are discarded will 20857be8da07SAndreas Gruenbacher * disappear from the write_requests tree. 20867be8da07SAndreas Gruenbacher * 20877be8da07SAndreas Gruenbacher * In addition, wait for the conflicting 20887be8da07SAndreas Gruenbacher * request to finish locally before submitting 20897be8da07SAndreas Gruenbacher * the conflicting peer request. 20907be8da07SAndreas Gruenbacher */ 20917be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, &req->i); 20927be8da07SAndreas Gruenbacher if (err) { 20937be8da07SAndreas Gruenbacher _conn_request_state(mdev->tconn, 20947be8da07SAndreas Gruenbacher NS(conn, C_TIMEOUT), 20957be8da07SAndreas Gruenbacher CS_HARD); 20967be8da07SAndreas Gruenbacher fail_postponed_requests(mdev, sector, size); 20977be8da07SAndreas Gruenbacher goto out; 20987be8da07SAndreas Gruenbacher } 20997be8da07SAndreas Gruenbacher goto repeat; 21007be8da07SAndreas Gruenbacher } 21017be8da07SAndreas Gruenbacher /* 21027be8da07SAndreas Gruenbacher * Remember to restart the conflicting requests after 21037be8da07SAndreas Gruenbacher * the new peer request has completed. 21047be8da07SAndreas Gruenbacher */ 21057be8da07SAndreas Gruenbacher peer_req->flags |= EE_RESTART_REQUESTS; 21067be8da07SAndreas Gruenbacher } 21077be8da07SAndreas Gruenbacher } 21087be8da07SAndreas Gruenbacher err = 0; 21097be8da07SAndreas Gruenbacher 21107be8da07SAndreas Gruenbacher out: 21117be8da07SAndreas Gruenbacher if (err) 21127be8da07SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 21137be8da07SAndreas Gruenbacher return err; 21147be8da07SAndreas Gruenbacher } 21157be8da07SAndreas Gruenbacher 2116b411b363SPhilipp Reisner /* mirrored write */ 21174a76b161SAndreas Gruenbacher static int receive_Data(struct drbd_tconn *tconn, struct packet_info *pi) 2118b411b363SPhilipp Reisner { 21194a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2120b411b363SPhilipp Reisner sector_t sector; 2121db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2122e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 21237be8da07SAndreas Gruenbacher u32 peer_seq = be32_to_cpu(p->seq_num); 2124b411b363SPhilipp Reisner int rw = WRITE; 2125b411b363SPhilipp Reisner u32 dp_flags; 2126302bdeaeSPhilipp Reisner int err, tp; 21277be8da07SAndreas Gruenbacher 21284a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 21294a76b161SAndreas Gruenbacher if (!mdev) 21304a76b161SAndreas Gruenbacher return -EIO; 21314a76b161SAndreas Gruenbacher 2132b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 213382bc0194SAndreas Gruenbacher int err2; 213482bc0194SAndreas Gruenbacher 21357be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 2136e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 213712038a3aSPhilipp Reisner atomic_inc(&tconn->current_epoch->epoch_size); 2138e2857216SAndreas Gruenbacher err2 = drbd_drain_block(mdev, pi->size); 213982bc0194SAndreas Gruenbacher if (!err) 214082bc0194SAndreas Gruenbacher err = err2; 214182bc0194SAndreas Gruenbacher return err; 2142b411b363SPhilipp Reisner } 2143b411b363SPhilipp Reisner 2144fcefa62eSAndreas Gruenbacher /* 2145fcefa62eSAndreas Gruenbacher * Corresponding put_ldev done either below (on various errors), or in 2146fcefa62eSAndreas Gruenbacher * drbd_peer_request_endio, if we successfully submit the data at the 2147fcefa62eSAndreas Gruenbacher * end of this function. 2148fcefa62eSAndreas Gruenbacher */ 2149b411b363SPhilipp Reisner 2150b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2151e2857216SAndreas Gruenbacher peer_req = read_in_block(mdev, p->block_id, sector, pi->size); 2152db830c46SAndreas Gruenbacher if (!peer_req) { 2153b411b363SPhilipp Reisner put_ldev(mdev); 215482bc0194SAndreas Gruenbacher return -EIO; 2155b411b363SPhilipp Reisner } 2156b411b363SPhilipp Reisner 2157db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_block; 2158b411b363SPhilipp Reisner 2159688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 2160688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 2161688593c5SLars Ellenberg 2162688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 2163db830c46SAndreas Gruenbacher peer_req->flags |= EE_MAY_SET_IN_SYNC; 2164688593c5SLars Ellenberg 216512038a3aSPhilipp Reisner spin_lock(&tconn->epoch_lock); 216612038a3aSPhilipp Reisner peer_req->epoch = tconn->current_epoch; 2167db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->epoch_size); 2168db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->active); 216912038a3aSPhilipp Reisner spin_unlock(&tconn->epoch_lock); 2170b411b363SPhilipp Reisner 2171302bdeaeSPhilipp Reisner rcu_read_lock(); 2172302bdeaeSPhilipp Reisner tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; 2173302bdeaeSPhilipp Reisner rcu_read_unlock(); 2174302bdeaeSPhilipp Reisner if (tp) { 2175302bdeaeSPhilipp Reisner peer_req->flags |= EE_IN_INTERVAL_TREE; 21767be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 21777be8da07SAndreas Gruenbacher if (err) 2178b411b363SPhilipp Reisner goto out_interrupted; 217987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 21807be8da07SAndreas Gruenbacher err = handle_write_conflicts(mdev, peer_req); 21817be8da07SAndreas Gruenbacher if (err) { 218287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 21837be8da07SAndreas Gruenbacher if (err == -ENOENT) { 2184b411b363SPhilipp Reisner put_ldev(mdev); 218582bc0194SAndreas Gruenbacher return 0; 2186b411b363SPhilipp Reisner } 2187b411b363SPhilipp Reisner goto out_interrupted; 2188b411b363SPhilipp Reisner } 21897be8da07SAndreas Gruenbacher } else 219087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2191db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->active_ee); 219287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2193b411b363SPhilipp Reisner 2194303d1448SPhilipp Reisner if (mdev->tconn->agreed_pro_version < 100) { 219544ed167dSPhilipp Reisner rcu_read_lock(); 219644ed167dSPhilipp Reisner switch (rcu_dereference(mdev->tconn->net_conf)->wire_protocol) { 2197b411b363SPhilipp Reisner case DRBD_PROT_C: 2198303d1448SPhilipp Reisner dp_flags |= DP_SEND_WRITE_ACK; 2199303d1448SPhilipp Reisner break; 2200303d1448SPhilipp Reisner case DRBD_PROT_B: 2201303d1448SPhilipp Reisner dp_flags |= DP_SEND_RECEIVE_ACK; 2202303d1448SPhilipp Reisner break; 2203303d1448SPhilipp Reisner } 220444ed167dSPhilipp Reisner rcu_read_unlock(); 2205303d1448SPhilipp Reisner } 2206303d1448SPhilipp Reisner 2207303d1448SPhilipp Reisner if (dp_flags & DP_SEND_WRITE_ACK) { 2208303d1448SPhilipp Reisner peer_req->flags |= EE_SEND_WRITE_ACK; 2209b411b363SPhilipp Reisner inc_unacked(mdev); 2210b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 2211b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 2212303d1448SPhilipp Reisner } 2213303d1448SPhilipp Reisner 2214303d1448SPhilipp Reisner if (dp_flags & DP_SEND_RECEIVE_ACK) { 2215b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 2216b411b363SPhilipp Reisner * sends on the msock, but anyways */ 2217db830c46SAndreas Gruenbacher drbd_send_ack(mdev, P_RECV_ACK, peer_req); 2218b411b363SPhilipp Reisner } 2219b411b363SPhilipp Reisner 22206719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 2221b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 2222db830c46SAndreas Gruenbacher drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); 2223db830c46SAndreas Gruenbacher peer_req->flags |= EE_CALL_AL_COMPLETE_IO; 2224db830c46SAndreas Gruenbacher peer_req->flags &= ~EE_MAY_SET_IN_SYNC; 2225181286adSLars Ellenberg drbd_al_begin_io(mdev, &peer_req->i); 2226b411b363SPhilipp Reisner } 2227b411b363SPhilipp Reisner 222882bc0194SAndreas Gruenbacher err = drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR); 222982bc0194SAndreas Gruenbacher if (!err) 223082bc0194SAndreas Gruenbacher return 0; 2231b411b363SPhilipp Reisner 223210f6d992SLars Ellenberg /* don't care for the reason here */ 223310f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 223487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2235db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 2236db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 223787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2238db830c46SAndreas Gruenbacher if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) 2239181286adSLars Ellenberg drbd_al_complete_io(mdev, &peer_req->i); 224022cc37a9SLars Ellenberg 2241b411b363SPhilipp Reisner out_interrupted: 22421e9dd291SPhilipp Reisner drbd_may_finish_epoch(tconn, peer_req->epoch, EV_PUT + EV_CLEANUP); 2243b411b363SPhilipp Reisner put_ldev(mdev); 22443967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 224582bc0194SAndreas Gruenbacher return err; 2246b411b363SPhilipp Reisner } 2247b411b363SPhilipp Reisner 22480f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 22490f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 22500f0601f4SLars Ellenberg * 22510f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 22520f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 22530f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 22540f0601f4SLars Ellenberg * activity, it obviously is "busy". 22550f0601f4SLars Ellenberg * 22560f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 22570f0601f4SLars Ellenberg * to have a short time average so we can react faster. 22580f0601f4SLars Ellenberg */ 2259e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 22600f0601f4SLars Ellenberg { 22610f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 22620f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 2263e3555d85SPhilipp Reisner struct lc_element *tmp; 22640f0601f4SLars Ellenberg int curr_events; 22650f0601f4SLars Ellenberg int throttle = 0; 2266daeda1ccSPhilipp Reisner unsigned int c_min_rate; 2267daeda1ccSPhilipp Reisner 2268daeda1ccSPhilipp Reisner rcu_read_lock(); 2269daeda1ccSPhilipp Reisner c_min_rate = rcu_dereference(mdev->ldev->disk_conf)->c_min_rate; 2270daeda1ccSPhilipp Reisner rcu_read_unlock(); 22710f0601f4SLars Ellenberg 22720f0601f4SLars Ellenberg /* feature disabled? */ 2273daeda1ccSPhilipp Reisner if (c_min_rate == 0) 22740f0601f4SLars Ellenberg return 0; 22750f0601f4SLars Ellenberg 2276e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 2277e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 2278e3555d85SPhilipp Reisner if (tmp) { 2279e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 2280e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 2281e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2282e3555d85SPhilipp Reisner return 0; 2283e3555d85SPhilipp Reisner } 2284e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 2285e3555d85SPhilipp Reisner } 2286e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2287e3555d85SPhilipp Reisner 22880f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 22890f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 22900f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 2291e3555d85SPhilipp Reisner 22920f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 22930f0601f4SLars Ellenberg unsigned long rs_left; 22940f0601f4SLars Ellenberg int i; 22950f0601f4SLars Ellenberg 22960f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 22970f0601f4SLars Ellenberg 22980f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 22990f0601f4SLars Ellenberg * approx. */ 23002649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 23012649f080SLars Ellenberg 23022649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 23032649f080SLars Ellenberg rs_left = mdev->ov_left; 23042649f080SLars Ellenberg else 23050f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 23060f0601f4SLars Ellenberg 23070f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 23080f0601f4SLars Ellenberg if (!dt) 23090f0601f4SLars Ellenberg dt++; 23100f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 23110f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 23120f0601f4SLars Ellenberg 2313daeda1ccSPhilipp Reisner if (dbdt > c_min_rate) 23140f0601f4SLars Ellenberg throttle = 1; 23150f0601f4SLars Ellenberg } 23160f0601f4SLars Ellenberg return throttle; 23170f0601f4SLars Ellenberg } 23180f0601f4SLars Ellenberg 23190f0601f4SLars Ellenberg 23204a76b161SAndreas Gruenbacher static int receive_DataRequest(struct drbd_tconn *tconn, struct packet_info *pi) 2321b411b363SPhilipp Reisner { 23224a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2323b411b363SPhilipp Reisner sector_t sector; 23244a76b161SAndreas Gruenbacher sector_t capacity; 2325db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2326b411b363SPhilipp Reisner struct digest_info *di = NULL; 2327b18b37beSPhilipp Reisner int size, verb; 2328b411b363SPhilipp Reisner unsigned int fault_type; 2329e658983aSAndreas Gruenbacher struct p_block_req *p = pi->data; 23304a76b161SAndreas Gruenbacher 23314a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 23324a76b161SAndreas Gruenbacher if (!mdev) 23334a76b161SAndreas Gruenbacher return -EIO; 23344a76b161SAndreas Gruenbacher capacity = drbd_get_capacity(mdev->this_bdev); 2335b411b363SPhilipp Reisner 2336b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2337b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2338b411b363SPhilipp Reisner 2339c670a398SAndreas Gruenbacher if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { 2340b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2341b411b363SPhilipp Reisner (unsigned long long)sector, size); 234282bc0194SAndreas Gruenbacher return -EINVAL; 2343b411b363SPhilipp Reisner } 2344b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 2345b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2346b411b363SPhilipp Reisner (unsigned long long)sector, size); 234782bc0194SAndreas Gruenbacher return -EINVAL; 2348b411b363SPhilipp Reisner } 2349b411b363SPhilipp Reisner 2350b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 2351b18b37beSPhilipp Reisner verb = 1; 2352e2857216SAndreas Gruenbacher switch (pi->cmd) { 2353b18b37beSPhilipp Reisner case P_DATA_REQUEST: 2354b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 2355b18b37beSPhilipp Reisner break; 2356b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2357b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2358b18b37beSPhilipp Reisner case P_OV_REQUEST: 2359b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 2360b18b37beSPhilipp Reisner break; 2361b18b37beSPhilipp Reisner case P_OV_REPLY: 2362b18b37beSPhilipp Reisner verb = 0; 2363b18b37beSPhilipp Reisner dec_rs_pending(mdev); 2364b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 2365b18b37beSPhilipp Reisner break; 2366b18b37beSPhilipp Reisner default: 236749ba9b1bSAndreas Gruenbacher BUG(); 2368b18b37beSPhilipp Reisner } 2369b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2370b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2371b411b363SPhilipp Reisner "no local data.\n"); 2372b18b37beSPhilipp Reisner 2373a821cc4aSLars Ellenberg /* drain possibly payload */ 2374e2857216SAndreas Gruenbacher return drbd_drain_block(mdev, pi->size); 2375b411b363SPhilipp Reisner } 2376b411b363SPhilipp Reisner 2377b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2378b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2379b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 23800db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, p->block_id, sector, size, GFP_NOIO); 2381db830c46SAndreas Gruenbacher if (!peer_req) { 2382b411b363SPhilipp Reisner put_ldev(mdev); 238382bc0194SAndreas Gruenbacher return -ENOMEM; 2384b411b363SPhilipp Reisner } 2385b411b363SPhilipp Reisner 2386e2857216SAndreas Gruenbacher switch (pi->cmd) { 2387b411b363SPhilipp Reisner case P_DATA_REQUEST: 2388db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_data_req; 2389b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 239080a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 239180a40e43SLars Ellenberg goto submit; 239280a40e43SLars Ellenberg 2393b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2394db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_rsdata_req; 2395b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 23965f9915bbSLars Ellenberg /* used in the sector offset progress display */ 23975f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2398b411b363SPhilipp Reisner break; 2399b411b363SPhilipp Reisner 2400b411b363SPhilipp Reisner case P_OV_REPLY: 2401b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2402b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2403e2857216SAndreas Gruenbacher di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); 2404b411b363SPhilipp Reisner if (!di) 2405b411b363SPhilipp Reisner goto out_free_e; 2406b411b363SPhilipp Reisner 2407e2857216SAndreas Gruenbacher di->digest_size = pi->size; 2408b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2409b411b363SPhilipp Reisner 2410db830c46SAndreas Gruenbacher peer_req->digest = di; 2411db830c46SAndreas Gruenbacher peer_req->flags |= EE_HAS_DIGEST; 2412c36c3cedSLars Ellenberg 2413e2857216SAndreas Gruenbacher if (drbd_recv_all(mdev->tconn, di->digest, pi->size)) 2414b411b363SPhilipp Reisner goto out_free_e; 2415b411b363SPhilipp Reisner 2416e2857216SAndreas Gruenbacher if (pi->cmd == P_CSUM_RS_REQUEST) { 241731890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 2418db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_csum_rs_req; 24195f9915bbSLars Ellenberg /* used in the sector offset progress display */ 24205f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2421e2857216SAndreas Gruenbacher } else if (pi->cmd == P_OV_REPLY) { 24222649f080SLars Ellenberg /* track progress, we may need to throttle */ 24232649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2424db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_reply; 2425b411b363SPhilipp Reisner dec_rs_pending(mdev); 24260f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 24270f0601f4SLars Ellenberg * but accounting still needs to be done. */ 24280f0601f4SLars Ellenberg goto submit_for_resync; 2429b411b363SPhilipp Reisner } 2430b411b363SPhilipp Reisner break; 2431b411b363SPhilipp Reisner 2432b411b363SPhilipp Reisner case P_OV_REQUEST: 2433b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 243431890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90) { 2435de228bbaSLars Ellenberg unsigned long now = jiffies; 2436de228bbaSLars Ellenberg int i; 2437b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2438b411b363SPhilipp Reisner mdev->ov_position = sector; 243930b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 244030b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2441de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2442de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2443de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2444de228bbaSLars Ellenberg } 2445b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2446b411b363SPhilipp Reisner (unsigned long long)sector); 2447b411b363SPhilipp Reisner } 2448db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_req; 2449b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2450b411b363SPhilipp Reisner break; 2451b411b363SPhilipp Reisner 2452b411b363SPhilipp Reisner default: 245349ba9b1bSAndreas Gruenbacher BUG(); 2454b411b363SPhilipp Reisner } 2455b411b363SPhilipp Reisner 24560f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 24570f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 24580f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 24590f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 24600f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 24610f0601f4SLars Ellenberg * 24620f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 24630f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 24640f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 24650f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 24660f0601f4SLars Ellenberg * a while, anyways. 24670f0601f4SLars Ellenberg */ 2468b411b363SPhilipp Reisner 24690f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 24700f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 24710f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 24720f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 24730f0601f4SLars Ellenberg * 24740f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 24750f0601f4SLars Ellenberg * we would also throttle its application reads. 24760f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 24770f0601f4SLars Ellenberg */ 2478e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2479e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2480e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 248180a40e43SLars Ellenberg goto out_free_e; 2482b411b363SPhilipp Reisner 24830f0601f4SLars Ellenberg submit_for_resync: 24840f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 24850f0601f4SLars Ellenberg 248680a40e43SLars Ellenberg submit: 2487b411b363SPhilipp Reisner inc_unacked(mdev); 248887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2489db830c46SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->read_ee); 249087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2491b411b363SPhilipp Reisner 2492fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0) 249382bc0194SAndreas Gruenbacher return 0; 2494b411b363SPhilipp Reisner 249510f6d992SLars Ellenberg /* don't care for the reason here */ 249610f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 249787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2498db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 249987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 250022cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 250122cc37a9SLars Ellenberg 2502b411b363SPhilipp Reisner out_free_e: 2503b411b363SPhilipp Reisner put_ldev(mdev); 25043967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 250582bc0194SAndreas Gruenbacher return -EIO; 2506b411b363SPhilipp Reisner } 2507b411b363SPhilipp Reisner 2508b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2509b411b363SPhilipp Reisner { 2510b411b363SPhilipp Reisner int self, peer, rv = -100; 2511b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 251244ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_0p; 2513b411b363SPhilipp Reisner 2514b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2515b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2516b411b363SPhilipp Reisner 2517b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2518b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2519b411b363SPhilipp Reisner 252044ed167dSPhilipp Reisner rcu_read_lock(); 252144ed167dSPhilipp Reisner after_sb_0p = rcu_dereference(mdev->tconn->net_conf)->after_sb_0p; 252244ed167dSPhilipp Reisner rcu_read_unlock(); 252344ed167dSPhilipp Reisner switch (after_sb_0p) { 2524b411b363SPhilipp Reisner case ASB_CONSENSUS: 2525b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2526b411b363SPhilipp Reisner case ASB_CALL_HELPER: 252744ed167dSPhilipp Reisner case ASB_VIOLENTLY: 2528b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2529b411b363SPhilipp Reisner break; 2530b411b363SPhilipp Reisner case ASB_DISCONNECT: 2531b411b363SPhilipp Reisner break; 2532b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2533b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2534b411b363SPhilipp Reisner rv = -1; 2535b411b363SPhilipp Reisner break; 2536b411b363SPhilipp Reisner } 2537b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2538b411b363SPhilipp Reisner rv = 1; 2539b411b363SPhilipp Reisner break; 2540b411b363SPhilipp Reisner } 2541b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2542b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2543b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2544b411b363SPhilipp Reisner rv = 1; 2545b411b363SPhilipp Reisner break; 2546b411b363SPhilipp Reisner } 2547b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2548b411b363SPhilipp Reisner rv = -1; 2549b411b363SPhilipp Reisner break; 2550b411b363SPhilipp Reisner } 2551b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2552ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2553b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2554b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2555b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 255625703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2557b411b363SPhilipp Reisner ? -1 : 1; 2558b411b363SPhilipp Reisner break; 2559b411b363SPhilipp Reisner } else { 2560b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2561b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2562b411b363SPhilipp Reisner } 256344ed167dSPhilipp Reisner if (after_sb_0p == ASB_DISCARD_ZERO_CHG) 2564b411b363SPhilipp Reisner break; 2565b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2566b411b363SPhilipp Reisner if (ch_self < ch_peer) 2567b411b363SPhilipp Reisner rv = -1; 2568b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2569b411b363SPhilipp Reisner rv = 1; 2570b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2571b411b363SPhilipp Reisner /* Well, then use something else. */ 257225703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2573b411b363SPhilipp Reisner ? -1 : 1; 2574b411b363SPhilipp Reisner break; 2575b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2576b411b363SPhilipp Reisner rv = -1; 2577b411b363SPhilipp Reisner break; 2578b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2579b411b363SPhilipp Reisner rv = 1; 2580b411b363SPhilipp Reisner } 2581b411b363SPhilipp Reisner 2582b411b363SPhilipp Reisner return rv; 2583b411b363SPhilipp Reisner } 2584b411b363SPhilipp Reisner 2585b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2586b411b363SPhilipp Reisner { 25876184ea21SAndreas Gruenbacher int hg, rv = -100; 258844ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_1p; 2589b411b363SPhilipp Reisner 259044ed167dSPhilipp Reisner rcu_read_lock(); 259144ed167dSPhilipp Reisner after_sb_1p = rcu_dereference(mdev->tconn->net_conf)->after_sb_1p; 259244ed167dSPhilipp Reisner rcu_read_unlock(); 259344ed167dSPhilipp Reisner switch (after_sb_1p) { 2594b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2595b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2596b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2597b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2598b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 259944ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2600b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2601b411b363SPhilipp Reisner break; 2602b411b363SPhilipp Reisner case ASB_DISCONNECT: 2603b411b363SPhilipp Reisner break; 2604b411b363SPhilipp Reisner case ASB_CONSENSUS: 2605b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2606b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2607b411b363SPhilipp Reisner rv = hg; 2608b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2609b411b363SPhilipp Reisner rv = hg; 2610b411b363SPhilipp Reisner break; 2611b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2612b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2613b411b363SPhilipp Reisner break; 2614b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2615b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2616b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2617b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2618b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2619bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2620bb437946SAndreas Gruenbacher 2621bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2622b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2623b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2624b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2625bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2626bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2627b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2628b411b363SPhilipp Reisner } else { 2629b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2630b411b363SPhilipp Reisner rv = hg; 2631b411b363SPhilipp Reisner } 2632b411b363SPhilipp Reisner } else 2633b411b363SPhilipp Reisner rv = hg; 2634b411b363SPhilipp Reisner } 2635b411b363SPhilipp Reisner 2636b411b363SPhilipp Reisner return rv; 2637b411b363SPhilipp Reisner } 2638b411b363SPhilipp Reisner 2639b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2640b411b363SPhilipp Reisner { 26416184ea21SAndreas Gruenbacher int hg, rv = -100; 264244ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_2p; 2643b411b363SPhilipp Reisner 264444ed167dSPhilipp Reisner rcu_read_lock(); 264544ed167dSPhilipp Reisner after_sb_2p = rcu_dereference(mdev->tconn->net_conf)->after_sb_2p; 264644ed167dSPhilipp Reisner rcu_read_unlock(); 264744ed167dSPhilipp Reisner switch (after_sb_2p) { 2648b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2649b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2650b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2651b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2652b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2653b411b363SPhilipp Reisner case ASB_CONSENSUS: 2654b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 265544ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2656b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2657b411b363SPhilipp Reisner break; 2658b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2659b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2660b411b363SPhilipp Reisner break; 2661b411b363SPhilipp Reisner case ASB_DISCONNECT: 2662b411b363SPhilipp Reisner break; 2663b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2664b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2665b411b363SPhilipp Reisner if (hg == -1) { 2666bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2667bb437946SAndreas Gruenbacher 2668b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2669b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2670b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2671bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2672bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2673b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2674b411b363SPhilipp Reisner } else { 2675b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2676b411b363SPhilipp Reisner rv = hg; 2677b411b363SPhilipp Reisner } 2678b411b363SPhilipp Reisner } else 2679b411b363SPhilipp Reisner rv = hg; 2680b411b363SPhilipp Reisner } 2681b411b363SPhilipp Reisner 2682b411b363SPhilipp Reisner return rv; 2683b411b363SPhilipp Reisner } 2684b411b363SPhilipp Reisner 2685b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2686b411b363SPhilipp Reisner u64 bits, u64 flags) 2687b411b363SPhilipp Reisner { 2688b411b363SPhilipp Reisner if (!uuid) { 2689b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2690b411b363SPhilipp Reisner return; 2691b411b363SPhilipp Reisner } 2692b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2693b411b363SPhilipp Reisner text, 2694b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2695b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2696b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2697b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2698b411b363SPhilipp Reisner (unsigned long long)bits, 2699b411b363SPhilipp Reisner (unsigned long long)flags); 2700b411b363SPhilipp Reisner } 2701b411b363SPhilipp Reisner 2702b411b363SPhilipp Reisner /* 2703b411b363SPhilipp Reisner 100 after split brain try auto recover 2704b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2705b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2706b411b363SPhilipp Reisner 0 no Sync 2707b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2708b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2709b411b363SPhilipp Reisner -100 after split brain, disconnect 2710b411b363SPhilipp Reisner -1000 unrelated data 27114a23f264SPhilipp Reisner -1091 requires proto 91 27124a23f264SPhilipp Reisner -1096 requires proto 96 2713b411b363SPhilipp Reisner */ 2714b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2715b411b363SPhilipp Reisner { 2716b411b363SPhilipp Reisner u64 self, peer; 2717b411b363SPhilipp Reisner int i, j; 2718b411b363SPhilipp Reisner 2719b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2720b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2721b411b363SPhilipp Reisner 2722b411b363SPhilipp Reisner *rule_nr = 10; 2723b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2724b411b363SPhilipp Reisner return 0; 2725b411b363SPhilipp Reisner 2726b411b363SPhilipp Reisner *rule_nr = 20; 2727b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2728b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2729b411b363SPhilipp Reisner return -2; 2730b411b363SPhilipp Reisner 2731b411b363SPhilipp Reisner *rule_nr = 30; 2732b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2733b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2734b411b363SPhilipp Reisner return 2; 2735b411b363SPhilipp Reisner 2736b411b363SPhilipp Reisner if (self == peer) { 2737b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2738b411b363SPhilipp Reisner 2739b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2740b411b363SPhilipp Reisner 274131890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27424a23f264SPhilipp Reisner return -1091; 2743b411b363SPhilipp Reisner 2744b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2745b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2746b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2747b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2748b411b363SPhilipp Reisner 2749b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2750b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2751b411b363SPhilipp Reisner *rule_nr = 34; 2752b411b363SPhilipp Reisner } else { 2753b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2754b411b363SPhilipp Reisner *rule_nr = 36; 2755b411b363SPhilipp Reisner } 2756b411b363SPhilipp Reisner 2757b411b363SPhilipp Reisner return 1; 2758b411b363SPhilipp Reisner } 2759b411b363SPhilipp Reisner 2760b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2761b411b363SPhilipp Reisner 276231890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27634a23f264SPhilipp Reisner return -1091; 2764b411b363SPhilipp Reisner 2765b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2766b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2767b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2768b411b363SPhilipp Reisner 2769b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2770b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2771b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2772b411b363SPhilipp Reisner 2773b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2774b411b363SPhilipp Reisner *rule_nr = 35; 2775b411b363SPhilipp Reisner } else { 2776b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2777b411b363SPhilipp Reisner *rule_nr = 37; 2778b411b363SPhilipp Reisner } 2779b411b363SPhilipp Reisner 2780b411b363SPhilipp Reisner return -1; 2781b411b363SPhilipp Reisner } 2782b411b363SPhilipp Reisner 2783b411b363SPhilipp Reisner /* Common power [off|failure] */ 2784b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2785b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2786b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2787b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2788b411b363SPhilipp Reisner *rule_nr = 40; 2789b411b363SPhilipp Reisner 2790b411b363SPhilipp Reisner switch (rct) { 2791b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2792b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2793b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2794b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 279525703f83SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 2796b411b363SPhilipp Reisner return dc ? -1 : 1; 2797b411b363SPhilipp Reisner } 2798b411b363SPhilipp Reisner } 2799b411b363SPhilipp Reisner 2800b411b363SPhilipp Reisner *rule_nr = 50; 2801b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2802b411b363SPhilipp Reisner if (self == peer) 2803b411b363SPhilipp Reisner return -1; 2804b411b363SPhilipp Reisner 2805b411b363SPhilipp Reisner *rule_nr = 51; 2806b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2807b411b363SPhilipp Reisner if (self == peer) { 280831890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 28094a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 28104a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 28114a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2812b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2813b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2814b411b363SPhilipp Reisner 281531890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 28164a23f264SPhilipp Reisner return -1091; 2817b411b363SPhilipp Reisner 2818b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2819b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 28204a23f264SPhilipp Reisner 28214a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 28224a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 28234a23f264SPhilipp Reisner 2824b411b363SPhilipp Reisner return -1; 2825b411b363SPhilipp Reisner } 2826b411b363SPhilipp Reisner } 2827b411b363SPhilipp Reisner 2828b411b363SPhilipp Reisner *rule_nr = 60; 2829b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2830b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2831b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2832b411b363SPhilipp Reisner if (self == peer) 2833b411b363SPhilipp Reisner return -2; 2834b411b363SPhilipp Reisner } 2835b411b363SPhilipp Reisner 2836b411b363SPhilipp Reisner *rule_nr = 70; 2837b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2838b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2839b411b363SPhilipp Reisner if (self == peer) 2840b411b363SPhilipp Reisner return 1; 2841b411b363SPhilipp Reisner 2842b411b363SPhilipp Reisner *rule_nr = 71; 2843b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2844b411b363SPhilipp Reisner if (self == peer) { 284531890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 28464a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 28474a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 28484a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2849b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2850b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2851b411b363SPhilipp Reisner 285231890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 28534a23f264SPhilipp Reisner return -1091; 2854b411b363SPhilipp Reisner 2855b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2856b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2857b411b363SPhilipp Reisner 28584a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2859b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2860b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2861b411b363SPhilipp Reisner 2862b411b363SPhilipp Reisner return 1; 2863b411b363SPhilipp Reisner } 2864b411b363SPhilipp Reisner } 2865b411b363SPhilipp Reisner 2866b411b363SPhilipp Reisner 2867b411b363SPhilipp Reisner *rule_nr = 80; 2868d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2869b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2870b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2871b411b363SPhilipp Reisner if (self == peer) 2872b411b363SPhilipp Reisner return 2; 2873b411b363SPhilipp Reisner } 2874b411b363SPhilipp Reisner 2875b411b363SPhilipp Reisner *rule_nr = 90; 2876b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2877b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2878b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2879b411b363SPhilipp Reisner return 100; 2880b411b363SPhilipp Reisner 2881b411b363SPhilipp Reisner *rule_nr = 100; 2882b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2883b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2884b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2885b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2886b411b363SPhilipp Reisner if (self == peer) 2887b411b363SPhilipp Reisner return -100; 2888b411b363SPhilipp Reisner } 2889b411b363SPhilipp Reisner } 2890b411b363SPhilipp Reisner 2891b411b363SPhilipp Reisner return -1000; 2892b411b363SPhilipp Reisner } 2893b411b363SPhilipp Reisner 2894b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2895b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2896b411b363SPhilipp Reisner */ 2897b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2898b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2899b411b363SPhilipp Reisner { 2900b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2901b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 290244ed167dSPhilipp Reisner struct net_conf *nc; 29036dff2902SAndreas Gruenbacher int hg, rule_nr, rr_conflict, tentative; 2904b411b363SPhilipp Reisner 2905b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2906b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2907b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2908b411b363SPhilipp Reisner 2909b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2910b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2911b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2912b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2913b411b363SPhilipp Reisner 2914b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2915b411b363SPhilipp Reisner 2916b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2917b411b363SPhilipp Reisner 2918b411b363SPhilipp Reisner if (hg == -1000) { 2919b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2920b411b363SPhilipp Reisner return C_MASK; 2921b411b363SPhilipp Reisner } 29224a23f264SPhilipp Reisner if (hg < -1000) { 29234a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2924b411b363SPhilipp Reisner return C_MASK; 2925b411b363SPhilipp Reisner } 2926b411b363SPhilipp Reisner 2927b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2928b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2929b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2930b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2931b411b363SPhilipp Reisner if (f) 2932b411b363SPhilipp Reisner hg = hg*2; 2933b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2934b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2935b411b363SPhilipp Reisner } 2936b411b363SPhilipp Reisner 29373a11a487SAdam Gandelman if (abs(hg) == 100) 29383a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 29393a11a487SAdam Gandelman 294044ed167dSPhilipp Reisner rcu_read_lock(); 294144ed167dSPhilipp Reisner nc = rcu_dereference(mdev->tconn->net_conf); 294244ed167dSPhilipp Reisner 294344ed167dSPhilipp Reisner if (hg == 100 || (hg == -100 && nc->always_asbp)) { 2944b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2945b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2946b411b363SPhilipp Reisner int forced = (hg == -100); 2947b411b363SPhilipp Reisner 2948b411b363SPhilipp Reisner switch (pcount) { 2949b411b363SPhilipp Reisner case 0: 2950b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2951b411b363SPhilipp Reisner break; 2952b411b363SPhilipp Reisner case 1: 2953b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2954b411b363SPhilipp Reisner break; 2955b411b363SPhilipp Reisner case 2: 2956b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2957b411b363SPhilipp Reisner break; 2958b411b363SPhilipp Reisner } 2959b411b363SPhilipp Reisner if (abs(hg) < 100) { 2960b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2961b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2962b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2963b411b363SPhilipp Reisner if (forced) { 2964b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2965b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2966b411b363SPhilipp Reisner hg = hg*2; 2967b411b363SPhilipp Reisner } 2968b411b363SPhilipp Reisner } 2969b411b363SPhilipp Reisner } 2970b411b363SPhilipp Reisner 2971b411b363SPhilipp Reisner if (hg == -100) { 297208b165baSPhilipp Reisner if (test_bit(DISCARD_MY_DATA, &mdev->flags) && !(mdev->p_uuid[UI_FLAGS]&1)) 2973b411b363SPhilipp Reisner hg = -1; 297408b165baSPhilipp Reisner if (!test_bit(DISCARD_MY_DATA, &mdev->flags) && (mdev->p_uuid[UI_FLAGS]&1)) 2975b411b363SPhilipp Reisner hg = 1; 2976b411b363SPhilipp Reisner 2977b411b363SPhilipp Reisner if (abs(hg) < 100) 2978b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2979b411b363SPhilipp Reisner "Sync from %s node\n", 2980b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2981b411b363SPhilipp Reisner } 298244ed167dSPhilipp Reisner rr_conflict = nc->rr_conflict; 29836dff2902SAndreas Gruenbacher tentative = nc->tentative; 298444ed167dSPhilipp Reisner rcu_read_unlock(); 2985b411b363SPhilipp Reisner 2986b411b363SPhilipp Reisner if (hg == -100) { 2987580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2988580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2989580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2990580b9767SLars Ellenberg * to that disk, in a way... */ 29913a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2992b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2993b411b363SPhilipp Reisner return C_MASK; 2994b411b363SPhilipp Reisner } 2995b411b363SPhilipp Reisner 2996b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2997b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2998b411b363SPhilipp Reisner return C_MASK; 2999b411b363SPhilipp Reisner } 3000b411b363SPhilipp Reisner 3001b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 3002b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 300344ed167dSPhilipp Reisner switch (rr_conflict) { 3004b411b363SPhilipp Reisner case ASB_CALL_HELPER: 3005b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 3006b411b363SPhilipp Reisner /* fall through */ 3007b411b363SPhilipp Reisner case ASB_DISCONNECT: 3008b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 3009b411b363SPhilipp Reisner return C_MASK; 3010b411b363SPhilipp Reisner case ASB_VIOLENTLY: 3011b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 3012b411b363SPhilipp Reisner "assumption\n"); 3013b411b363SPhilipp Reisner } 3014b411b363SPhilipp Reisner } 3015b411b363SPhilipp Reisner 30166dff2902SAndreas Gruenbacher if (tentative || test_bit(CONN_DRY_RUN, &mdev->tconn->flags)) { 3017cf14c2e9SPhilipp Reisner if (hg == 0) 3018cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 3019cf14c2e9SPhilipp Reisner else 3020cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 3021cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 3022cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 3023cf14c2e9SPhilipp Reisner return C_MASK; 3024cf14c2e9SPhilipp Reisner } 3025cf14c2e9SPhilipp Reisner 3026b411b363SPhilipp Reisner if (abs(hg) >= 2) { 3027b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 302820ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 302920ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 3030b411b363SPhilipp Reisner return C_MASK; 3031b411b363SPhilipp Reisner } 3032b411b363SPhilipp Reisner 3033b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 3034b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 3035b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 3036b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 3037b411b363SPhilipp Reisner } else { 3038b411b363SPhilipp Reisner rv = C_CONNECTED; 3039b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 3040b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 3041b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 3042b411b363SPhilipp Reisner } 3043b411b363SPhilipp Reisner } 3044b411b363SPhilipp Reisner 3045b411b363SPhilipp Reisner return rv; 3046b411b363SPhilipp Reisner } 3047b411b363SPhilipp Reisner 3048f179d76dSPhilipp Reisner static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) 3049b411b363SPhilipp Reisner { 3050b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 3051f179d76dSPhilipp Reisner if (peer == ASB_DISCARD_REMOTE) 3052f179d76dSPhilipp Reisner return ASB_DISCARD_LOCAL; 3053b411b363SPhilipp Reisner 3054b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 3055f179d76dSPhilipp Reisner if (peer == ASB_DISCARD_LOCAL) 3056f179d76dSPhilipp Reisner return ASB_DISCARD_REMOTE; 3057b411b363SPhilipp Reisner 3058b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 3059f179d76dSPhilipp Reisner return peer; 3060b411b363SPhilipp Reisner } 3061b411b363SPhilipp Reisner 3062e2857216SAndreas Gruenbacher static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi) 3063b411b363SPhilipp Reisner { 3064e658983aSAndreas Gruenbacher struct p_protocol *p = pi->data; 3065036b17eaSPhilipp Reisner enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 3066036b17eaSPhilipp Reisner int p_proto, p_discard_my_data, p_two_primaries, cf; 3067036b17eaSPhilipp Reisner struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; 3068036b17eaSPhilipp Reisner char integrity_alg[SHARED_SECRET_MAX] = ""; 3069accdbcc5SAndreas Gruenbacher struct crypto_hash *peer_integrity_tfm = NULL; 30707aca6c75SPhilipp Reisner void *int_dig_in = NULL, *int_dig_vv = NULL; 3071b411b363SPhilipp Reisner 3072b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 3073b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 3074b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 3075b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 3076b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 3077cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 30786139f60dSAndreas Gruenbacher p_discard_my_data = cf & CF_DISCARD_MY_DATA; 3079cf14c2e9SPhilipp Reisner 308086db0618SAndreas Gruenbacher if (tconn->agreed_pro_version >= 87) { 308186db0618SAndreas Gruenbacher int err; 308286db0618SAndreas Gruenbacher 308388104ca4SAndreas Gruenbacher if (pi->size > sizeof(integrity_alg)) 308486db0618SAndreas Gruenbacher return -EIO; 308588104ca4SAndreas Gruenbacher err = drbd_recv_all(tconn, integrity_alg, pi->size); 308686db0618SAndreas Gruenbacher if (err) 308786db0618SAndreas Gruenbacher return err; 308888104ca4SAndreas Gruenbacher integrity_alg[SHARED_SECRET_MAX - 1] = 0; 3089036b17eaSPhilipp Reisner } 309086db0618SAndreas Gruenbacher 30917d4c782cSAndreas Gruenbacher if (pi->cmd != P_PROTOCOL_UPDATE) { 30927204624cSPhilipp Reisner clear_bit(CONN_DRY_RUN, &tconn->flags); 3093cf14c2e9SPhilipp Reisner 3094cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 30957204624cSPhilipp Reisner set_bit(CONN_DRY_RUN, &tconn->flags); 3096b411b363SPhilipp Reisner 309744ed167dSPhilipp Reisner rcu_read_lock(); 309844ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 309944ed167dSPhilipp Reisner 3100036b17eaSPhilipp Reisner if (p_proto != nc->wire_protocol) { 3101d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "protocol"); 310244ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3103b411b363SPhilipp Reisner } 3104b411b363SPhilipp Reisner 3105f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { 3106d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "after-sb-0pri"); 310744ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3108b411b363SPhilipp Reisner } 3109b411b363SPhilipp Reisner 3110f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { 3111d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "after-sb-1pri"); 311244ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3113b411b363SPhilipp Reisner } 3114b411b363SPhilipp Reisner 3115f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { 3116d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "after-sb-2pri"); 311744ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3118b411b363SPhilipp Reisner } 3119b411b363SPhilipp Reisner 31206139f60dSAndreas Gruenbacher if (p_discard_my_data && nc->discard_my_data) { 3121d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "discard-my-data"); 312244ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3123b411b363SPhilipp Reisner } 3124b411b363SPhilipp Reisner 312544ed167dSPhilipp Reisner if (p_two_primaries != nc->two_primaries) { 3126d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "allow-two-primaries"); 312744ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3128b411b363SPhilipp Reisner } 3129b411b363SPhilipp Reisner 3130036b17eaSPhilipp Reisner if (strcmp(integrity_alg, nc->integrity_alg)) { 3131d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "data-integrity-alg"); 3132036b17eaSPhilipp Reisner goto disconnect_rcu_unlock; 3133036b17eaSPhilipp Reisner } 3134036b17eaSPhilipp Reisner 313586db0618SAndreas Gruenbacher rcu_read_unlock(); 3136fbc12f45SAndreas Gruenbacher } 31377d4c782cSAndreas Gruenbacher 31387d4c782cSAndreas Gruenbacher if (integrity_alg[0]) { 31397d4c782cSAndreas Gruenbacher int hash_size; 31407d4c782cSAndreas Gruenbacher 31417d4c782cSAndreas Gruenbacher /* 31427d4c782cSAndreas Gruenbacher * We can only change the peer data integrity algorithm 31437d4c782cSAndreas Gruenbacher * here. Changing our own data integrity algorithm 31447d4c782cSAndreas Gruenbacher * requires that we send a P_PROTOCOL_UPDATE packet at 31457d4c782cSAndreas Gruenbacher * the same time; otherwise, the peer has no way to 31467d4c782cSAndreas Gruenbacher * tell between which packets the algorithm should 31477d4c782cSAndreas Gruenbacher * change. 31487d4c782cSAndreas Gruenbacher */ 31497d4c782cSAndreas Gruenbacher 31507d4c782cSAndreas Gruenbacher peer_integrity_tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC); 31517d4c782cSAndreas Gruenbacher if (!peer_integrity_tfm) { 31527d4c782cSAndreas Gruenbacher conn_err(tconn, "peer data-integrity-alg %s not supported\n", 31537d4c782cSAndreas Gruenbacher integrity_alg); 31547d4c782cSAndreas Gruenbacher goto disconnect; 31557d4c782cSAndreas Gruenbacher } 31567d4c782cSAndreas Gruenbacher 31577d4c782cSAndreas Gruenbacher hash_size = crypto_hash_digestsize(peer_integrity_tfm); 31587d4c782cSAndreas Gruenbacher int_dig_in = kmalloc(hash_size, GFP_KERNEL); 31597d4c782cSAndreas Gruenbacher int_dig_vv = kmalloc(hash_size, GFP_KERNEL); 31607d4c782cSAndreas Gruenbacher if (!(int_dig_in && int_dig_vv)) { 31617d4c782cSAndreas Gruenbacher conn_err(tconn, "Allocation of buffers for data integrity checking failed\n"); 31627d4c782cSAndreas Gruenbacher goto disconnect; 31637d4c782cSAndreas Gruenbacher } 31647d4c782cSAndreas Gruenbacher } 31657d4c782cSAndreas Gruenbacher 31667d4c782cSAndreas Gruenbacher new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); 31677d4c782cSAndreas Gruenbacher if (!new_net_conf) { 31687d4c782cSAndreas Gruenbacher conn_err(tconn, "Allocation of new net_conf failed\n"); 31697d4c782cSAndreas Gruenbacher goto disconnect; 31707d4c782cSAndreas Gruenbacher } 31717d4c782cSAndreas Gruenbacher 31727d4c782cSAndreas Gruenbacher mutex_lock(&tconn->data.mutex); 31737d4c782cSAndreas Gruenbacher mutex_lock(&tconn->conf_update); 31747d4c782cSAndreas Gruenbacher old_net_conf = tconn->net_conf; 31757d4c782cSAndreas Gruenbacher *new_net_conf = *old_net_conf; 31767d4c782cSAndreas Gruenbacher 31777d4c782cSAndreas Gruenbacher new_net_conf->wire_protocol = p_proto; 31787d4c782cSAndreas Gruenbacher new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); 31797d4c782cSAndreas Gruenbacher new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); 31807d4c782cSAndreas Gruenbacher new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); 31817d4c782cSAndreas Gruenbacher new_net_conf->two_primaries = p_two_primaries; 31827d4c782cSAndreas Gruenbacher 31837d4c782cSAndreas Gruenbacher rcu_assign_pointer(tconn->net_conf, new_net_conf); 31847d4c782cSAndreas Gruenbacher mutex_unlock(&tconn->conf_update); 31857d4c782cSAndreas Gruenbacher mutex_unlock(&tconn->data.mutex); 31867d4c782cSAndreas Gruenbacher 31877d4c782cSAndreas Gruenbacher crypto_free_hash(tconn->peer_integrity_tfm); 31887d4c782cSAndreas Gruenbacher kfree(tconn->int_dig_in); 31897d4c782cSAndreas Gruenbacher kfree(tconn->int_dig_vv); 31907d4c782cSAndreas Gruenbacher tconn->peer_integrity_tfm = peer_integrity_tfm; 31917d4c782cSAndreas Gruenbacher tconn->int_dig_in = int_dig_in; 31927d4c782cSAndreas Gruenbacher tconn->int_dig_vv = int_dig_vv; 31937d4c782cSAndreas Gruenbacher 31947d4c782cSAndreas Gruenbacher if (strcmp(old_net_conf->integrity_alg, integrity_alg)) 31957d4c782cSAndreas Gruenbacher conn_info(tconn, "peer data-integrity-alg: %s\n", 31967d4c782cSAndreas Gruenbacher integrity_alg[0] ? integrity_alg : "(none)"); 31977d4c782cSAndreas Gruenbacher 31987d4c782cSAndreas Gruenbacher synchronize_rcu(); 31997d4c782cSAndreas Gruenbacher kfree(old_net_conf); 320082bc0194SAndreas Gruenbacher return 0; 3201b411b363SPhilipp Reisner 320244ed167dSPhilipp Reisner disconnect_rcu_unlock: 320344ed167dSPhilipp Reisner rcu_read_unlock(); 3204b411b363SPhilipp Reisner disconnect: 3205b792c35cSAndreas Gruenbacher crypto_free_hash(peer_integrity_tfm); 3206036b17eaSPhilipp Reisner kfree(int_dig_in); 3207036b17eaSPhilipp Reisner kfree(int_dig_vv); 32087204624cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 320982bc0194SAndreas Gruenbacher return -EIO; 3210b411b363SPhilipp Reisner } 3211b411b363SPhilipp Reisner 3212b411b363SPhilipp Reisner /* helper function 3213b411b363SPhilipp Reisner * input: alg name, feature name 3214b411b363SPhilipp Reisner * return: NULL (alg name was "") 3215b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 3216b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 3217b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 3218b411b363SPhilipp Reisner const char *alg, const char *name) 3219b411b363SPhilipp Reisner { 3220b411b363SPhilipp Reisner struct crypto_hash *tfm; 3221b411b363SPhilipp Reisner 3222b411b363SPhilipp Reisner if (!alg[0]) 3223b411b363SPhilipp Reisner return NULL; 3224b411b363SPhilipp Reisner 3225b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 3226b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 3227b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 3228b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 3229b411b363SPhilipp Reisner return tfm; 3230b411b363SPhilipp Reisner } 3231b411b363SPhilipp Reisner return tfm; 3232b411b363SPhilipp Reisner } 3233b411b363SPhilipp Reisner 32344a76b161SAndreas Gruenbacher static int ignore_remaining_packet(struct drbd_tconn *tconn, struct packet_info *pi) 3235b411b363SPhilipp Reisner { 32364a76b161SAndreas Gruenbacher void *buffer = tconn->data.rbuf; 32374a76b161SAndreas Gruenbacher int size = pi->size; 32384a76b161SAndreas Gruenbacher 32394a76b161SAndreas Gruenbacher while (size) { 32404a76b161SAndreas Gruenbacher int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); 32414a76b161SAndreas Gruenbacher s = drbd_recv(tconn, buffer, s); 32424a76b161SAndreas Gruenbacher if (s <= 0) { 32434a76b161SAndreas Gruenbacher if (s < 0) 32444a76b161SAndreas Gruenbacher return s; 32454a76b161SAndreas Gruenbacher break; 32464a76b161SAndreas Gruenbacher } 32474a76b161SAndreas Gruenbacher size -= s; 32484a76b161SAndreas Gruenbacher } 32494a76b161SAndreas Gruenbacher if (size) 32504a76b161SAndreas Gruenbacher return -EIO; 32514a76b161SAndreas Gruenbacher return 0; 32524a76b161SAndreas Gruenbacher } 32534a76b161SAndreas Gruenbacher 32544a76b161SAndreas Gruenbacher /* 32554a76b161SAndreas Gruenbacher * config_unknown_volume - device configuration command for unknown volume 32564a76b161SAndreas Gruenbacher * 32574a76b161SAndreas Gruenbacher * When a device is added to an existing connection, the node on which the 32584a76b161SAndreas Gruenbacher * device is added first will send configuration commands to its peer but the 32594a76b161SAndreas Gruenbacher * peer will not know about the device yet. It will warn and ignore these 32604a76b161SAndreas Gruenbacher * commands. Once the device is added on the second node, the second node will 32614a76b161SAndreas Gruenbacher * send the same device configuration commands, but in the other direction. 32624a76b161SAndreas Gruenbacher * 32634a76b161SAndreas Gruenbacher * (We can also end up here if drbd is misconfigured.) 32644a76b161SAndreas Gruenbacher */ 32654a76b161SAndreas Gruenbacher static int config_unknown_volume(struct drbd_tconn *tconn, struct packet_info *pi) 32664a76b161SAndreas Gruenbacher { 32672fcb8f30SAndreas Gruenbacher conn_warn(tconn, "%s packet received for volume %u, which is not configured locally\n", 32682fcb8f30SAndreas Gruenbacher cmdname(pi->cmd), pi->vnr); 32694a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 32704a76b161SAndreas Gruenbacher } 32714a76b161SAndreas Gruenbacher 32724a76b161SAndreas Gruenbacher static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi) 32734a76b161SAndreas Gruenbacher { 32744a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3275e658983aSAndreas Gruenbacher struct p_rs_param_95 *p; 3276b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 3277b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 3278b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 32792ec91e0eSPhilipp Reisner struct net_conf *old_net_conf, *new_net_conf = NULL; 3280813472ceSPhilipp Reisner struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; 32814a76b161SAndreas Gruenbacher const int apv = tconn->agreed_pro_version; 3282813472ceSPhilipp Reisner struct fifo_buffer *old_plan = NULL, *new_plan = NULL; 3283778f271dSPhilipp Reisner int fifo_size = 0; 328482bc0194SAndreas Gruenbacher int err; 3285b411b363SPhilipp Reisner 32864a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 32874a76b161SAndreas Gruenbacher if (!mdev) 32884a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 32894a76b161SAndreas Gruenbacher 3290b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 3291b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 3292b411b363SPhilipp Reisner + SHARED_SECRET_MAX 32938e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 32948e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 3295b411b363SPhilipp Reisner 3296e2857216SAndreas Gruenbacher if (pi->size > exp_max_sz) { 3297b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 3298e2857216SAndreas Gruenbacher pi->size, exp_max_sz); 329982bc0194SAndreas Gruenbacher return -EIO; 3300b411b363SPhilipp Reisner } 3301b411b363SPhilipp Reisner 3302b411b363SPhilipp Reisner if (apv <= 88) { 3303e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param); 3304e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 33058e26f9ccSPhilipp Reisner } else if (apv <= 94) { 3306e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_89); 3307e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3308b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 33098e26f9ccSPhilipp Reisner } else { 3310e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_95); 3311e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3312b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 3313b411b363SPhilipp Reisner } 3314b411b363SPhilipp Reisner 3315b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 3316e658983aSAndreas Gruenbacher p = pi->data; 3317b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 3318b411b363SPhilipp Reisner 3319e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, header_size); 332082bc0194SAndreas Gruenbacher if (err) 332182bc0194SAndreas Gruenbacher return err; 3322b411b363SPhilipp Reisner 3323813472ceSPhilipp Reisner mutex_lock(&mdev->tconn->conf_update); 3324813472ceSPhilipp Reisner old_net_conf = mdev->tconn->net_conf; 3325813472ceSPhilipp Reisner if (get_ldev(mdev)) { 3326daeda1ccSPhilipp Reisner new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); 3327daeda1ccSPhilipp Reisner if (!new_disk_conf) { 3328813472ceSPhilipp Reisner put_ldev(mdev); 3329813472ceSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3330daeda1ccSPhilipp Reisner dev_err(DEV, "Allocation of new disk_conf failed\n"); 3331daeda1ccSPhilipp Reisner return -ENOMEM; 3332f399002eSLars Ellenberg } 3333b411b363SPhilipp Reisner 3334daeda1ccSPhilipp Reisner old_disk_conf = mdev->ldev->disk_conf; 3335daeda1ccSPhilipp Reisner *new_disk_conf = *old_disk_conf; 3336daeda1ccSPhilipp Reisner 33376394b935SAndreas Gruenbacher new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); 3338813472ceSPhilipp Reisner } 3339daeda1ccSPhilipp Reisner 3340b411b363SPhilipp Reisner if (apv >= 88) { 3341b411b363SPhilipp Reisner if (apv == 88) { 3342b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 3343b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 3344b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 3345b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 3346813472ceSPhilipp Reisner err = -EIO; 3347813472ceSPhilipp Reisner goto reconnect; 3348b411b363SPhilipp Reisner } 3349b411b363SPhilipp Reisner 335082bc0194SAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size); 3351813472ceSPhilipp Reisner if (err) 3352813472ceSPhilipp Reisner goto reconnect; 3353b411b363SPhilipp Reisner /* we expect NUL terminated string */ 3354b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3355b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 3356b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 3357b411b363SPhilipp Reisner 3358b411b363SPhilipp Reisner } else /* apv >= 89 */ { 3359b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 3360b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3361b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 3362b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 3363b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 3364b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 3365b411b363SPhilipp Reisner } 3366b411b363SPhilipp Reisner 33672ec91e0eSPhilipp Reisner if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { 3368b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3369b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 33702ec91e0eSPhilipp Reisner old_net_conf->verify_alg, p->verify_alg); 3371b411b363SPhilipp Reisner goto disconnect; 3372b411b363SPhilipp Reisner } 3373b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 3374b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 3375b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 3376b411b363SPhilipp Reisner verify_tfm = NULL; 3377b411b363SPhilipp Reisner goto disconnect; 3378b411b363SPhilipp Reisner } 3379b411b363SPhilipp Reisner } 3380b411b363SPhilipp Reisner 33812ec91e0eSPhilipp Reisner if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { 3382b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3383b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 33842ec91e0eSPhilipp Reisner old_net_conf->csums_alg, p->csums_alg); 3385b411b363SPhilipp Reisner goto disconnect; 3386b411b363SPhilipp Reisner } 3387b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 3388b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 3389b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 3390b411b363SPhilipp Reisner csums_tfm = NULL; 3391b411b363SPhilipp Reisner goto disconnect; 3392b411b363SPhilipp Reisner } 3393b411b363SPhilipp Reisner } 3394b411b363SPhilipp Reisner 3395813472ceSPhilipp Reisner if (apv > 94 && new_disk_conf) { 3396daeda1ccSPhilipp Reisner new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 3397daeda1ccSPhilipp Reisner new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); 3398daeda1ccSPhilipp Reisner new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); 3399daeda1ccSPhilipp Reisner new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); 3400778f271dSPhilipp Reisner 3401daeda1ccSPhilipp Reisner fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; 34029958c857SPhilipp Reisner if (fifo_size != mdev->rs_plan_s->size) { 3403813472ceSPhilipp Reisner new_plan = fifo_alloc(fifo_size); 3404813472ceSPhilipp Reisner if (!new_plan) { 3405778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 3406f399002eSLars Ellenberg put_ldev(mdev); 3407778f271dSPhilipp Reisner goto disconnect; 3408778f271dSPhilipp Reisner } 3409778f271dSPhilipp Reisner } 34108e26f9ccSPhilipp Reisner } 3411b411b363SPhilipp Reisner 341291fd4dadSPhilipp Reisner if (verify_tfm || csums_tfm) { 34132ec91e0eSPhilipp Reisner new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 34142ec91e0eSPhilipp Reisner if (!new_net_conf) { 341591fd4dadSPhilipp Reisner dev_err(DEV, "Allocation of new net_conf failed\n"); 341691fd4dadSPhilipp Reisner goto disconnect; 341791fd4dadSPhilipp Reisner } 341891fd4dadSPhilipp Reisner 34192ec91e0eSPhilipp Reisner *new_net_conf = *old_net_conf; 342091fd4dadSPhilipp Reisner 3421b411b363SPhilipp Reisner if (verify_tfm) { 34222ec91e0eSPhilipp Reisner strcpy(new_net_conf->verify_alg, p->verify_alg); 34232ec91e0eSPhilipp Reisner new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; 3424f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->verify_tfm); 3425f399002eSLars Ellenberg mdev->tconn->verify_tfm = verify_tfm; 3426b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 3427b411b363SPhilipp Reisner } 3428b411b363SPhilipp Reisner if (csums_tfm) { 34292ec91e0eSPhilipp Reisner strcpy(new_net_conf->csums_alg, p->csums_alg); 34302ec91e0eSPhilipp Reisner new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; 3431f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->csums_tfm); 3432f399002eSLars Ellenberg mdev->tconn->csums_tfm = csums_tfm; 3433b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 3434b411b363SPhilipp Reisner } 34352ec91e0eSPhilipp Reisner rcu_assign_pointer(tconn->net_conf, new_net_conf); 343691fd4dadSPhilipp Reisner } 343791fd4dadSPhilipp Reisner } 343891fd4dadSPhilipp Reisner 3439813472ceSPhilipp Reisner if (new_disk_conf) { 3440daeda1ccSPhilipp Reisner rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); 3441813472ceSPhilipp Reisner put_ldev(mdev); 3442778f271dSPhilipp Reisner } 3443813472ceSPhilipp Reisner 3444813472ceSPhilipp Reisner if (new_plan) { 3445813472ceSPhilipp Reisner old_plan = mdev->rs_plan_s; 3446813472ceSPhilipp Reisner rcu_assign_pointer(mdev->rs_plan_s, new_plan); 3447813472ceSPhilipp Reisner } 3448daeda1ccSPhilipp Reisner 3449daeda1ccSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3450daeda1ccSPhilipp Reisner synchronize_rcu(); 3451daeda1ccSPhilipp Reisner if (new_net_conf) 3452daeda1ccSPhilipp Reisner kfree(old_net_conf); 3453daeda1ccSPhilipp Reisner kfree(old_disk_conf); 3454813472ceSPhilipp Reisner kfree(old_plan); 3455daeda1ccSPhilipp Reisner 345682bc0194SAndreas Gruenbacher return 0; 3457b411b363SPhilipp Reisner 3458813472ceSPhilipp Reisner reconnect: 3459813472ceSPhilipp Reisner if (new_disk_conf) { 3460813472ceSPhilipp Reisner put_ldev(mdev); 3461813472ceSPhilipp Reisner kfree(new_disk_conf); 3462813472ceSPhilipp Reisner } 3463813472ceSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3464813472ceSPhilipp Reisner return -EIO; 3465813472ceSPhilipp Reisner 3466b411b363SPhilipp Reisner disconnect: 3467813472ceSPhilipp Reisner kfree(new_plan); 3468813472ceSPhilipp Reisner if (new_disk_conf) { 3469813472ceSPhilipp Reisner put_ldev(mdev); 3470813472ceSPhilipp Reisner kfree(new_disk_conf); 3471813472ceSPhilipp Reisner } 3472a0095508SPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3473b411b363SPhilipp Reisner /* just for completeness: actually not needed, 3474b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 3475b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 3476b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 3477b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 347838fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 347982bc0194SAndreas Gruenbacher return -EIO; 3480b411b363SPhilipp Reisner } 3481b411b363SPhilipp Reisner 3482b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 3483b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 3484b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 3485b411b363SPhilipp Reisner { 3486b411b363SPhilipp Reisner sector_t d; 3487b411b363SPhilipp Reisner if (a == 0 || b == 0) 3488b411b363SPhilipp Reisner return; 3489b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 3490b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 3491b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 3492b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 3493b411b363SPhilipp Reisner } 3494b411b363SPhilipp Reisner 34954a76b161SAndreas Gruenbacher static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi) 3496b411b363SPhilipp Reisner { 34974a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3498e658983aSAndreas Gruenbacher struct p_sizes *p = pi->data; 3499b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 3500b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 3501b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 3502e89b591cSPhilipp Reisner enum dds_flags ddsf; 3503b411b363SPhilipp Reisner 35044a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 35054a76b161SAndreas Gruenbacher if (!mdev) 35064a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 35074a76b161SAndreas Gruenbacher 3508b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 3509b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 3510b411b363SPhilipp Reisner 3511b411b363SPhilipp Reisner /* just store the peer's disk size for now. 3512b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 3513b411b363SPhilipp Reisner mdev->p_size = p_size; 3514b411b363SPhilipp Reisner 3515b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3516daeda1ccSPhilipp Reisner rcu_read_lock(); 3517daeda1ccSPhilipp Reisner my_usize = rcu_dereference(mdev->ldev->disk_conf)->disk_size; 3518daeda1ccSPhilipp Reisner rcu_read_unlock(); 3519daeda1ccSPhilipp Reisner 3520b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 3521b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 3522b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 3523daeda1ccSPhilipp Reisner p_usize, my_usize); 3524b411b363SPhilipp Reisner 3525b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 3526b411b363SPhilipp Reisner * param exchange, choose the minimum */ 3527b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 3528daeda1ccSPhilipp Reisner p_usize = min_not_zero(my_usize, p_usize); 3529b411b363SPhilipp Reisner 3530b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3531b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3532ef5e44a6SPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, p_usize, 0) < 3533b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3534b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3535b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3536b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 353738fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 3538b411b363SPhilipp Reisner put_ldev(mdev); 353982bc0194SAndreas Gruenbacher return -EIO; 3540b411b363SPhilipp Reisner } 3541daeda1ccSPhilipp Reisner 3542daeda1ccSPhilipp Reisner if (my_usize != p_usize) { 3543daeda1ccSPhilipp Reisner struct disk_conf *old_disk_conf, *new_disk_conf = NULL; 3544daeda1ccSPhilipp Reisner 3545daeda1ccSPhilipp Reisner new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); 3546daeda1ccSPhilipp Reisner if (!new_disk_conf) { 3547daeda1ccSPhilipp Reisner dev_err(DEV, "Allocation of new disk_conf failed\n"); 3548daeda1ccSPhilipp Reisner put_ldev(mdev); 3549daeda1ccSPhilipp Reisner return -ENOMEM; 3550daeda1ccSPhilipp Reisner } 3551daeda1ccSPhilipp Reisner 3552daeda1ccSPhilipp Reisner mutex_lock(&mdev->tconn->conf_update); 3553daeda1ccSPhilipp Reisner old_disk_conf = mdev->ldev->disk_conf; 3554daeda1ccSPhilipp Reisner *new_disk_conf = *old_disk_conf; 3555daeda1ccSPhilipp Reisner new_disk_conf->disk_size = p_usize; 3556daeda1ccSPhilipp Reisner 3557daeda1ccSPhilipp Reisner rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); 3558daeda1ccSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3559daeda1ccSPhilipp Reisner synchronize_rcu(); 3560daeda1ccSPhilipp Reisner kfree(old_disk_conf); 3561daeda1ccSPhilipp Reisner 3562daeda1ccSPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3563daeda1ccSPhilipp Reisner (unsigned long)my_usize); 3564daeda1ccSPhilipp Reisner } 3565daeda1ccSPhilipp Reisner 3566b411b363SPhilipp Reisner put_ldev(mdev); 3567b411b363SPhilipp Reisner } 3568b411b363SPhilipp Reisner 3569e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3570b411b363SPhilipp Reisner if (get_ldev(mdev)) { 357124c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 3572b411b363SPhilipp Reisner put_ldev(mdev); 3573b411b363SPhilipp Reisner if (dd == dev_size_error) 357482bc0194SAndreas Gruenbacher return -EIO; 3575b411b363SPhilipp Reisner drbd_md_sync(mdev); 3576b411b363SPhilipp Reisner } else { 3577b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3578b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3579b411b363SPhilipp Reisner } 3580b411b363SPhilipp Reisner 358199432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 358299432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 358399432fccSPhilipp Reisner 3584b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3585b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3586b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3587b411b363SPhilipp Reisner ldsc = 1; 3588b411b363SPhilipp Reisner } 3589b411b363SPhilipp Reisner 3590b411b363SPhilipp Reisner put_ldev(mdev); 3591b411b363SPhilipp Reisner } 3592b411b363SPhilipp Reisner 3593b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3594b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3595b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3596b411b363SPhilipp Reisner /* we have different sizes, probably peer 3597b411b363SPhilipp Reisner * needs to know my new size... */ 3598e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3599b411b363SPhilipp Reisner } 3600b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3601b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3602b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3603e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3604e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3605e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3606b411b363SPhilipp Reisner else 3607e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3608e89b591cSPhilipp Reisner } else 3609b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3610b411b363SPhilipp Reisner } 3611b411b363SPhilipp Reisner } 3612b411b363SPhilipp Reisner 361382bc0194SAndreas Gruenbacher return 0; 3614b411b363SPhilipp Reisner } 3615b411b363SPhilipp Reisner 36164a76b161SAndreas Gruenbacher static int receive_uuids(struct drbd_tconn *tconn, struct packet_info *pi) 3617b411b363SPhilipp Reisner { 36184a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3619e658983aSAndreas Gruenbacher struct p_uuids *p = pi->data; 3620b411b363SPhilipp Reisner u64 *p_uuid; 362162b0da3aSLars Ellenberg int i, updated_uuids = 0; 3622b411b363SPhilipp Reisner 36234a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 36244a76b161SAndreas Gruenbacher if (!mdev) 36254a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 36264a76b161SAndreas Gruenbacher 3627b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3628b411b363SPhilipp Reisner 3629b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3630b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3631b411b363SPhilipp Reisner 3632b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3633b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3634b411b363SPhilipp Reisner 3635b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3636b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3637b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3638b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3639b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3640b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 364138fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 364282bc0194SAndreas Gruenbacher return -EIO; 3643b411b363SPhilipp Reisner } 3644b411b363SPhilipp Reisner 3645b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3646b411b363SPhilipp Reisner int skip_initial_sync = 3647b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 364831890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90 && 3649b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3650b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3651b411b363SPhilipp Reisner if (skip_initial_sync) { 3652b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3653b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 365420ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 365520ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3656b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3657b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3658b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3659b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3660b411b363SPhilipp Reisner drbd_md_sync(mdev); 366162b0da3aSLars Ellenberg updated_uuids = 1; 3662b411b363SPhilipp Reisner } 3663b411b363SPhilipp Reisner put_ldev(mdev); 366418a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 366518a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 366618a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 366718a50fa2SPhilipp Reisner for me. */ 366862b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3669b411b363SPhilipp Reisner } 3670b411b363SPhilipp Reisner 3671b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3672b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3673b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3674b411b363SPhilipp Reisner new disk state... */ 36758410da8fSPhilipp Reisner mutex_lock(mdev->state_mutex); 36768410da8fSPhilipp Reisner mutex_unlock(mdev->state_mutex); 3677b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 367862b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 367962b0da3aSLars Ellenberg 368062b0da3aSLars Ellenberg if (updated_uuids) 368162b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3682b411b363SPhilipp Reisner 368382bc0194SAndreas Gruenbacher return 0; 3684b411b363SPhilipp Reisner } 3685b411b363SPhilipp Reisner 3686b411b363SPhilipp Reisner /** 3687b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3688b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3689b411b363SPhilipp Reisner */ 3690b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3691b411b363SPhilipp Reisner { 3692b411b363SPhilipp Reisner union drbd_state ms; 3693b411b363SPhilipp Reisner 3694b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3695369bea63SPhilipp Reisner [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, 3696b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3697b411b363SPhilipp Reisner 3698b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3699b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3700b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3701b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3702b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3703b411b363SPhilipp Reisner }; 3704b411b363SPhilipp Reisner 3705b411b363SPhilipp Reisner ms.i = ps.i; 3706b411b363SPhilipp Reisner 3707b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3708b411b363SPhilipp Reisner ms.peer = ps.role; 3709b411b363SPhilipp Reisner ms.role = ps.peer; 3710b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3711b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3712b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3713b411b363SPhilipp Reisner 3714b411b363SPhilipp Reisner return ms; 3715b411b363SPhilipp Reisner } 3716b411b363SPhilipp Reisner 37174a76b161SAndreas Gruenbacher static int receive_req_state(struct drbd_tconn *tconn, struct packet_info *pi) 3718b411b363SPhilipp Reisner { 37194a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3720e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3721b411b363SPhilipp Reisner union drbd_state mask, val; 3722bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3723b411b363SPhilipp Reisner 37244a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 37254a76b161SAndreas Gruenbacher if (!mdev) 37264a76b161SAndreas Gruenbacher return -EIO; 37274a76b161SAndreas Gruenbacher 3728b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3729b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3730b411b363SPhilipp Reisner 373125703f83SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && 37328410da8fSPhilipp Reisner mutex_is_locked(mdev->state_mutex)) { 3733b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 373482bc0194SAndreas Gruenbacher return 0; 3735b411b363SPhilipp Reisner } 3736b411b363SPhilipp Reisner 3737b411b363SPhilipp Reisner mask = convert_state(mask); 3738b411b363SPhilipp Reisner val = convert_state(val); 3739b411b363SPhilipp Reisner 3740b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3741b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3742047cd4a6SPhilipp Reisner 3743b411b363SPhilipp Reisner drbd_md_sync(mdev); 3744b411b363SPhilipp Reisner 374582bc0194SAndreas Gruenbacher return 0; 3746b411b363SPhilipp Reisner } 3747b411b363SPhilipp Reisner 3748e2857216SAndreas Gruenbacher static int receive_req_conn_state(struct drbd_tconn *tconn, struct packet_info *pi) 3749dfafcc8aSPhilipp Reisner { 3750e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3751dfafcc8aSPhilipp Reisner union drbd_state mask, val; 3752dfafcc8aSPhilipp Reisner enum drbd_state_rv rv; 3753dfafcc8aSPhilipp Reisner 3754dfafcc8aSPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3755dfafcc8aSPhilipp Reisner val.i = be32_to_cpu(p->val); 3756dfafcc8aSPhilipp Reisner 3757dfafcc8aSPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &tconn->flags) && 3758dfafcc8aSPhilipp Reisner mutex_is_locked(&tconn->cstate_mutex)) { 3759dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG); 376082bc0194SAndreas Gruenbacher return 0; 3761dfafcc8aSPhilipp Reisner } 3762dfafcc8aSPhilipp Reisner 3763dfafcc8aSPhilipp Reisner mask = convert_state(mask); 3764dfafcc8aSPhilipp Reisner val = convert_state(val); 3765dfafcc8aSPhilipp Reisner 3766778bcf2eSPhilipp Reisner rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); 3767dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, rv); 3768dfafcc8aSPhilipp Reisner 376982bc0194SAndreas Gruenbacher return 0; 3770dfafcc8aSPhilipp Reisner } 3771dfafcc8aSPhilipp Reisner 37724a76b161SAndreas Gruenbacher static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi) 3773b411b363SPhilipp Reisner { 37744a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3775e658983aSAndreas Gruenbacher struct p_state *p = pi->data; 37764ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3777b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 377865d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3779b411b363SPhilipp Reisner int rv; 3780b411b363SPhilipp Reisner 37814a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 37824a76b161SAndreas Gruenbacher if (!mdev) 37834a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 37844a76b161SAndreas Gruenbacher 3785b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3786b411b363SPhilipp Reisner 3787b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3788b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3789b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3790b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3791b411b363SPhilipp Reisner } 3792b411b363SPhilipp Reisner 379387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3794b411b363SPhilipp Reisner retry: 379578bae59bSPhilipp Reisner os = ns = drbd_read_state(mdev); 379687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3797b411b363SPhilipp Reisner 3798b8853dbdSPhilipp Reisner /* If some other part of the code (asender thread, timeout) 3799b8853dbdSPhilipp Reisner * already decided to close the connection again, 3800b8853dbdSPhilipp Reisner * we must not "re-establish" it here. */ 3801b8853dbdSPhilipp Reisner if (os.conn <= C_TEAR_DOWN) 3802b8853dbdSPhilipp Reisner return false; 3803b8853dbdSPhilipp Reisner 38049bcd2521SPhilipp Reisner /* If this is the "end of sync" confirmation, usually the peer disk 38059bcd2521SPhilipp Reisner * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits 38069bcd2521SPhilipp Reisner * set) resync started in PausedSyncT, or if the timing of pause-/ 38079bcd2521SPhilipp Reisner * unpause-sync events has been "just right", the peer disk may 38089bcd2521SPhilipp Reisner * transition from D_CONSISTENT to D_UP_TO_DATE as well. 38099bcd2521SPhilipp Reisner */ 38109bcd2521SPhilipp Reisner if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && 38119bcd2521SPhilipp Reisner real_peer_disk == D_UP_TO_DATE && 3812e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3813e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3814e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3815e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3816e9ef7bb6SLars Ellenberg * syncing states. 3817e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3818e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3819e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3820e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3821e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3822e9ef7bb6SLars Ellenberg 3823e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3824e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3825e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3826e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3827e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3828e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3829e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 383082bc0194SAndreas Gruenbacher return 0; 3831e9ef7bb6SLars Ellenberg } 3832e9ef7bb6SLars Ellenberg } 3833e9ef7bb6SLars Ellenberg 3834e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3835e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3836e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3837e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3838e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3839e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3840e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3841e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3842e9ef7bb6SLars Ellenberg 38434ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 38444ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3845b411b363SPhilipp Reisner 384667531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 384767531718SPhilipp Reisner ns.conn = C_BEHIND; 384867531718SPhilipp Reisner 3849b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3850b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3851b411b363SPhilipp Reisner int cr; /* consider resync */ 3852b411b363SPhilipp Reisner 3853b411b363SPhilipp Reisner /* if we established a new connection */ 38544ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3855b411b363SPhilipp Reisner /* if we had an established connection 3856b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 38574ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3858b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 38594ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3860b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3861b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3862b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3863b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3864b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 38654ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3866b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3867b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3868b411b363SPhilipp Reisner 3869b411b363SPhilipp Reisner if (cr) 38704ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3871b411b363SPhilipp Reisner 3872b411b363SPhilipp Reisner put_ldev(mdev); 38734ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 38744ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3875b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 387682f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3877b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3878b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3879b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3880580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3881b411b363SPhilipp Reisner } else { 38828169e41bSPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags)) 388382bc0194SAndreas Gruenbacher return -EIO; 38844ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 388538fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 388682bc0194SAndreas Gruenbacher return -EIO; 3887b411b363SPhilipp Reisner } 3888b411b363SPhilipp Reisner } 3889b411b363SPhilipp Reisner } 3890b411b363SPhilipp Reisner 389187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 389278bae59bSPhilipp Reisner if (os.i != drbd_read_state(mdev).i) 3893b411b363SPhilipp Reisner goto retry; 3894b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3895b411b363SPhilipp Reisner ns.peer = peer_state.role; 3896b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3897b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 38984ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3899b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 39004ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 39012aebfabbSPhilipp Reisner if (ns.pdsk == D_CONSISTENT && drbd_suspended(mdev) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3902481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 39038554df1cSAndreas Gruenbacher /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this 3904481c6f50SPhilipp Reisner for temporal network outages! */ 390587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3906481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 39072f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 3908481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3909481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 391038fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); 391182bc0194SAndreas Gruenbacher return -EIO; 3912481c6f50SPhilipp Reisner } 391365d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 391478bae59bSPhilipp Reisner ns = drbd_read_state(mdev); 391587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3916b411b363SPhilipp Reisner 3917b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 391838fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 391982bc0194SAndreas Gruenbacher return -EIO; 3920b411b363SPhilipp Reisner } 3921b411b363SPhilipp Reisner 39224ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 39234ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3924b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3925b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3926b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3927b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3928b411b363SPhilipp Reisner drbd_send_uuids(mdev); 392943de7c85SPhilipp Reisner drbd_send_current_state(mdev); 3930b411b363SPhilipp Reisner } 3931b411b363SPhilipp Reisner } 3932b411b363SPhilipp Reisner 393308b165baSPhilipp Reisner clear_bit(DISCARD_MY_DATA, &mdev->flags); 3934b411b363SPhilipp Reisner 3935b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3936b411b363SPhilipp Reisner 393782bc0194SAndreas Gruenbacher return 0; 3938b411b363SPhilipp Reisner } 3939b411b363SPhilipp Reisner 39404a76b161SAndreas Gruenbacher static int receive_sync_uuid(struct drbd_tconn *tconn, struct packet_info *pi) 3941b411b363SPhilipp Reisner { 39424a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3943e658983aSAndreas Gruenbacher struct p_rs_uuid *p = pi->data; 39444a76b161SAndreas Gruenbacher 39454a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 39464a76b161SAndreas Gruenbacher if (!mdev) 39474a76b161SAndreas Gruenbacher return -EIO; 3948b411b363SPhilipp Reisner 3949b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3950b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3951c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3952b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3953b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3954b411b363SPhilipp Reisner 3955b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3956b411b363SPhilipp Reisner 3957b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3958b411b363SPhilipp Reisner _not_ be rotated into the history */ 3959b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3960b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3961b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3962b411b363SPhilipp Reisner 396362b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3964b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3965b411b363SPhilipp Reisner 3966b411b363SPhilipp Reisner put_ldev(mdev); 3967b411b363SPhilipp Reisner } else 3968b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3969b411b363SPhilipp Reisner 397082bc0194SAndreas Gruenbacher return 0; 3971b411b363SPhilipp Reisner } 3972b411b363SPhilipp Reisner 39732c46407dSAndreas Gruenbacher /** 39742c46407dSAndreas Gruenbacher * receive_bitmap_plain 39752c46407dSAndreas Gruenbacher * 39762c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 39772c46407dSAndreas Gruenbacher * code upon failure. 39782c46407dSAndreas Gruenbacher */ 39792c46407dSAndreas Gruenbacher static int 398050d0b1adSAndreas Gruenbacher receive_bitmap_plain(struct drbd_conf *mdev, unsigned int size, 3981e658983aSAndreas Gruenbacher unsigned long *p, struct bm_xfer_ctx *c) 3982b411b363SPhilipp Reisner { 398350d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - 398450d0b1adSAndreas Gruenbacher drbd_header_size(mdev->tconn); 3985e658983aSAndreas Gruenbacher unsigned int num_words = min_t(size_t, data_size / sizeof(*p), 398650d0b1adSAndreas Gruenbacher c->bm_words - c->word_offset); 3987e658983aSAndreas Gruenbacher unsigned int want = num_words * sizeof(*p); 39882c46407dSAndreas Gruenbacher int err; 3989b411b363SPhilipp Reisner 399050d0b1adSAndreas Gruenbacher if (want != size) { 399150d0b1adSAndreas Gruenbacher dev_err(DEV, "%s:want (%u) != size (%u)\n", __func__, want, size); 39922c46407dSAndreas Gruenbacher return -EIO; 3993b411b363SPhilipp Reisner } 3994b411b363SPhilipp Reisner if (want == 0) 39952c46407dSAndreas Gruenbacher return 0; 3996e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, want); 399782bc0194SAndreas Gruenbacher if (err) 39982c46407dSAndreas Gruenbacher return err; 3999b411b363SPhilipp Reisner 4000e658983aSAndreas Gruenbacher drbd_bm_merge_lel(mdev, c->word_offset, num_words, p); 4001b411b363SPhilipp Reisner 4002b411b363SPhilipp Reisner c->word_offset += num_words; 4003b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 4004b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 4005b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 4006b411b363SPhilipp Reisner 40072c46407dSAndreas Gruenbacher return 1; 4008b411b363SPhilipp Reisner } 4009b411b363SPhilipp Reisner 4010a02d1240SAndreas Gruenbacher static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) 4011a02d1240SAndreas Gruenbacher { 4012a02d1240SAndreas Gruenbacher return (enum drbd_bitmap_code)(p->encoding & 0x0f); 4013a02d1240SAndreas Gruenbacher } 4014a02d1240SAndreas Gruenbacher 4015a02d1240SAndreas Gruenbacher static int dcbp_get_start(struct p_compressed_bm *p) 4016a02d1240SAndreas Gruenbacher { 4017a02d1240SAndreas Gruenbacher return (p->encoding & 0x80) != 0; 4018a02d1240SAndreas Gruenbacher } 4019a02d1240SAndreas Gruenbacher 4020a02d1240SAndreas Gruenbacher static int dcbp_get_pad_bits(struct p_compressed_bm *p) 4021a02d1240SAndreas Gruenbacher { 4022a02d1240SAndreas Gruenbacher return (p->encoding >> 4) & 0x7; 4023a02d1240SAndreas Gruenbacher } 4024a02d1240SAndreas Gruenbacher 40252c46407dSAndreas Gruenbacher /** 40262c46407dSAndreas Gruenbacher * recv_bm_rle_bits 40272c46407dSAndreas Gruenbacher * 40282c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 40292c46407dSAndreas Gruenbacher * code upon failure. 40302c46407dSAndreas Gruenbacher */ 40312c46407dSAndreas Gruenbacher static int 4032b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 4033b411b363SPhilipp Reisner struct p_compressed_bm *p, 4034c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 4035c6d25cfeSPhilipp Reisner unsigned int len) 4036b411b363SPhilipp Reisner { 4037b411b363SPhilipp Reisner struct bitstream bs; 4038b411b363SPhilipp Reisner u64 look_ahead; 4039b411b363SPhilipp Reisner u64 rl; 4040b411b363SPhilipp Reisner u64 tmp; 4041b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 4042b411b363SPhilipp Reisner unsigned long e; 4043a02d1240SAndreas Gruenbacher int toggle = dcbp_get_start(p); 4044b411b363SPhilipp Reisner int have; 4045b411b363SPhilipp Reisner int bits; 4046b411b363SPhilipp Reisner 4047a02d1240SAndreas Gruenbacher bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); 4048b411b363SPhilipp Reisner 4049b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 4050b411b363SPhilipp Reisner if (bits < 0) 40512c46407dSAndreas Gruenbacher return -EIO; 4052b411b363SPhilipp Reisner 4053b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 4054b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 4055b411b363SPhilipp Reisner if (bits <= 0) 40562c46407dSAndreas Gruenbacher return -EIO; 4057b411b363SPhilipp Reisner 4058b411b363SPhilipp Reisner if (toggle) { 4059b411b363SPhilipp Reisner e = s + rl -1; 4060b411b363SPhilipp Reisner if (e >= c->bm_bits) { 4061b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 40622c46407dSAndreas Gruenbacher return -EIO; 4063b411b363SPhilipp Reisner } 4064b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 4065b411b363SPhilipp Reisner } 4066b411b363SPhilipp Reisner 4067b411b363SPhilipp Reisner if (have < bits) { 4068b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 4069b411b363SPhilipp Reisner have, bits, look_ahead, 4070b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 4071b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 40722c46407dSAndreas Gruenbacher return -EIO; 4073b411b363SPhilipp Reisner } 4074b411b363SPhilipp Reisner look_ahead >>= bits; 4075b411b363SPhilipp Reisner have -= bits; 4076b411b363SPhilipp Reisner 4077b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 4078b411b363SPhilipp Reisner if (bits < 0) 40792c46407dSAndreas Gruenbacher return -EIO; 4080b411b363SPhilipp Reisner look_ahead |= tmp << have; 4081b411b363SPhilipp Reisner have += bits; 4082b411b363SPhilipp Reisner } 4083b411b363SPhilipp Reisner 4084b411b363SPhilipp Reisner c->bit_offset = s; 4085b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 4086b411b363SPhilipp Reisner 40872c46407dSAndreas Gruenbacher return (s != c->bm_bits); 4088b411b363SPhilipp Reisner } 4089b411b363SPhilipp Reisner 40902c46407dSAndreas Gruenbacher /** 40912c46407dSAndreas Gruenbacher * decode_bitmap_c 40922c46407dSAndreas Gruenbacher * 40932c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 40942c46407dSAndreas Gruenbacher * code upon failure. 40952c46407dSAndreas Gruenbacher */ 40962c46407dSAndreas Gruenbacher static int 4097b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 4098b411b363SPhilipp Reisner struct p_compressed_bm *p, 4099c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 4100c6d25cfeSPhilipp Reisner unsigned int len) 4101b411b363SPhilipp Reisner { 4102a02d1240SAndreas Gruenbacher if (dcbp_get_code(p) == RLE_VLI_Bits) 4103e658983aSAndreas Gruenbacher return recv_bm_rle_bits(mdev, p, c, len - sizeof(*p)); 4104b411b363SPhilipp Reisner 4105b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 4106b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 4107b411b363SPhilipp Reisner * during all our tests. */ 4108b411b363SPhilipp Reisner 4109b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 411038fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 41112c46407dSAndreas Gruenbacher return -EIO; 4112b411b363SPhilipp Reisner } 4113b411b363SPhilipp Reisner 4114b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 4115b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 4116b411b363SPhilipp Reisner { 4117b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 411850d0b1adSAndreas Gruenbacher unsigned int header_size = drbd_header_size(mdev->tconn); 411950d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; 412050d0b1adSAndreas Gruenbacher unsigned int plain = 412150d0b1adSAndreas Gruenbacher header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + 412250d0b1adSAndreas Gruenbacher c->bm_words * sizeof(unsigned long); 412350d0b1adSAndreas Gruenbacher unsigned int total = c->bytes[0] + c->bytes[1]; 412450d0b1adSAndreas Gruenbacher unsigned int r; 4125b411b363SPhilipp Reisner 4126b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 4127b411b363SPhilipp Reisner if (total == 0) 4128b411b363SPhilipp Reisner return; 4129b411b363SPhilipp Reisner 4130b411b363SPhilipp Reisner /* don't report if not compressed */ 4131b411b363SPhilipp Reisner if (total >= plain) 4132b411b363SPhilipp Reisner return; 4133b411b363SPhilipp Reisner 4134b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 4135b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 4136b411b363SPhilipp Reisner : (1000 * total / plain); 4137b411b363SPhilipp Reisner 4138b411b363SPhilipp Reisner if (r > 1000) 4139b411b363SPhilipp Reisner r = 1000; 4140b411b363SPhilipp Reisner 4141b411b363SPhilipp Reisner r = 1000 - r; 4142b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 4143b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 4144b411b363SPhilipp Reisner direction, 4145b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 4146b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 4147b411b363SPhilipp Reisner total, r/10, r % 10); 4148b411b363SPhilipp Reisner } 4149b411b363SPhilipp Reisner 4150b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 4151b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 4152b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 4153b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 4154b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 4155b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 4156b411b363SPhilipp Reisner 4157b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 41584a76b161SAndreas Gruenbacher static int receive_bitmap(struct drbd_tconn *tconn, struct packet_info *pi) 4159b411b363SPhilipp Reisner { 41604a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 4161b411b363SPhilipp Reisner struct bm_xfer_ctx c; 41622c46407dSAndreas Gruenbacher int err; 41634a76b161SAndreas Gruenbacher 41644a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 41654a76b161SAndreas Gruenbacher if (!mdev) 41664a76b161SAndreas Gruenbacher return -EIO; 4167b411b363SPhilipp Reisner 416820ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 416920ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 417020ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 4171b411b363SPhilipp Reisner 4172b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 4173b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 4174b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 4175b411b363SPhilipp Reisner }; 4176b411b363SPhilipp Reisner 41772c46407dSAndreas Gruenbacher for(;;) { 4178e658983aSAndreas Gruenbacher if (pi->cmd == P_BITMAP) 4179e658983aSAndreas Gruenbacher err = receive_bitmap_plain(mdev, pi->size, pi->data, &c); 4180e658983aSAndreas Gruenbacher else if (pi->cmd == P_COMPRESSED_BITMAP) { 4181b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 4182b411b363SPhilipp Reisner * and the feature is enabled! */ 4183e658983aSAndreas Gruenbacher struct p_compressed_bm *p = pi->data; 4184b411b363SPhilipp Reisner 418550d0b1adSAndreas Gruenbacher if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(tconn)) { 4186b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 418782bc0194SAndreas Gruenbacher err = -EIO; 4188b411b363SPhilipp Reisner goto out; 4189b411b363SPhilipp Reisner } 4190e658983aSAndreas Gruenbacher if (pi->size <= sizeof(*p)) { 4191e2857216SAndreas Gruenbacher dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", pi->size); 419282bc0194SAndreas Gruenbacher err = -EIO; 419378fcbdaeSAndreas Gruenbacher goto out; 4194b411b363SPhilipp Reisner } 4195e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, pi->size); 4196e658983aSAndreas Gruenbacher if (err) 4197e658983aSAndreas Gruenbacher goto out; 4198e2857216SAndreas Gruenbacher err = decode_bitmap_c(mdev, p, &c, pi->size); 4199b411b363SPhilipp Reisner } else { 4200e2857216SAndreas Gruenbacher dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); 420182bc0194SAndreas Gruenbacher err = -EIO; 4202b411b363SPhilipp Reisner goto out; 4203b411b363SPhilipp Reisner } 4204b411b363SPhilipp Reisner 4205e2857216SAndreas Gruenbacher c.packets[pi->cmd == P_BITMAP]++; 420650d0b1adSAndreas Gruenbacher c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(tconn) + pi->size; 4207b411b363SPhilipp Reisner 42082c46407dSAndreas Gruenbacher if (err <= 0) { 42092c46407dSAndreas Gruenbacher if (err < 0) 42102c46407dSAndreas Gruenbacher goto out; 4211b411b363SPhilipp Reisner break; 42122c46407dSAndreas Gruenbacher } 4213e2857216SAndreas Gruenbacher err = drbd_recv_header(mdev->tconn, pi); 421482bc0194SAndreas Gruenbacher if (err) 4215b411b363SPhilipp Reisner goto out; 42162c46407dSAndreas Gruenbacher } 4217b411b363SPhilipp Reisner 4218b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 4219b411b363SPhilipp Reisner 4220b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 4221de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 4222de1f8e4aSAndreas Gruenbacher 422382bc0194SAndreas Gruenbacher err = drbd_send_bitmap(mdev); 422482bc0194SAndreas Gruenbacher if (err) 4225b411b363SPhilipp Reisner goto out; 4226b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 4227de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 4228de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 4229b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 4230b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 4231b411b363SPhilipp Reisner * other threads may have noticed network errors */ 4232b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 4233b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 4234b411b363SPhilipp Reisner } 423582bc0194SAndreas Gruenbacher err = 0; 4236b411b363SPhilipp Reisner 4237b411b363SPhilipp Reisner out: 423820ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 423982bc0194SAndreas Gruenbacher if (!err && mdev->state.conn == C_WF_BITMAP_S) 4240b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 424182bc0194SAndreas Gruenbacher return err; 4242b411b363SPhilipp Reisner } 4243b411b363SPhilipp Reisner 42444a76b161SAndreas Gruenbacher static int receive_skip(struct drbd_tconn *tconn, struct packet_info *pi) 4245b411b363SPhilipp Reisner { 42464a76b161SAndreas Gruenbacher conn_warn(tconn, "skipping unknown optional packet type %d, l: %d!\n", 4247e2857216SAndreas Gruenbacher pi->cmd, pi->size); 42482de876efSPhilipp Reisner 42494a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 42502de876efSPhilipp Reisner } 42512de876efSPhilipp Reisner 42524a76b161SAndreas Gruenbacher static int receive_UnplugRemote(struct drbd_tconn *tconn, struct packet_info *pi) 4253b411b363SPhilipp Reisner { 4254b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 4255b411b363SPhilipp Reisner * with the data requests being unplugged */ 42564a76b161SAndreas Gruenbacher drbd_tcp_quickack(tconn->data.socket); 4257b411b363SPhilipp Reisner 425882bc0194SAndreas Gruenbacher return 0; 4259b411b363SPhilipp Reisner } 4260b411b363SPhilipp Reisner 42614a76b161SAndreas Gruenbacher static int receive_out_of_sync(struct drbd_tconn *tconn, struct packet_info *pi) 426273a01a18SPhilipp Reisner { 42634a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 4264e658983aSAndreas Gruenbacher struct p_block_desc *p = pi->data; 42654a76b161SAndreas Gruenbacher 42664a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 42674a76b161SAndreas Gruenbacher if (!mdev) 42684a76b161SAndreas Gruenbacher return -EIO; 426973a01a18SPhilipp Reisner 4270f735e363SLars Ellenberg switch (mdev->state.conn) { 4271f735e363SLars Ellenberg case C_WF_SYNC_UUID: 4272f735e363SLars Ellenberg case C_WF_BITMAP_T: 4273f735e363SLars Ellenberg case C_BEHIND: 4274f735e363SLars Ellenberg break; 4275f735e363SLars Ellenberg default: 4276f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 4277f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 4278f735e363SLars Ellenberg } 4279f735e363SLars Ellenberg 428073a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 428173a01a18SPhilipp Reisner 428282bc0194SAndreas Gruenbacher return 0; 428373a01a18SPhilipp Reisner } 428473a01a18SPhilipp Reisner 428502918be2SPhilipp Reisner struct data_cmd { 428602918be2SPhilipp Reisner int expect_payload; 428702918be2SPhilipp Reisner size_t pkt_size; 42884a76b161SAndreas Gruenbacher int (*fn)(struct drbd_tconn *, struct packet_info *); 4289b411b363SPhilipp Reisner }; 4290b411b363SPhilipp Reisner 429102918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 42924a76b161SAndreas Gruenbacher [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 42934a76b161SAndreas Gruenbacher [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 42944a76b161SAndreas Gruenbacher [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 42954a76b161SAndreas Gruenbacher [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 4296e658983aSAndreas Gruenbacher [P_BITMAP] = { 1, 0, receive_bitmap } , 4297e658983aSAndreas Gruenbacher [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , 4298e658983aSAndreas Gruenbacher [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, 42994a76b161SAndreas Gruenbacher [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 43004a76b161SAndreas Gruenbacher [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 4301e658983aSAndreas Gruenbacher [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, 4302e658983aSAndreas Gruenbacher [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, 43034a76b161SAndreas Gruenbacher [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 43044a76b161SAndreas Gruenbacher [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 43054a76b161SAndreas Gruenbacher [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 43064a76b161SAndreas Gruenbacher [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 43074a76b161SAndreas Gruenbacher [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 43084a76b161SAndreas Gruenbacher [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 43094a76b161SAndreas Gruenbacher [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 43104a76b161SAndreas Gruenbacher [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 43114a76b161SAndreas Gruenbacher [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 43124a76b161SAndreas Gruenbacher [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 43134a76b161SAndreas Gruenbacher [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 43144a76b161SAndreas Gruenbacher [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, 4315036b17eaSPhilipp Reisner [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, 431602918be2SPhilipp Reisner }; 431702918be2SPhilipp Reisner 4318eefc2f7dSPhilipp Reisner static void drbdd(struct drbd_tconn *tconn) 4319b411b363SPhilipp Reisner { 432077351055SPhilipp Reisner struct packet_info pi; 432102918be2SPhilipp Reisner size_t shs; /* sub header size */ 432282bc0194SAndreas Gruenbacher int err; 4323b411b363SPhilipp Reisner 4324eefc2f7dSPhilipp Reisner while (get_t_state(&tconn->receiver) == RUNNING) { 4325deebe195SAndreas Gruenbacher struct data_cmd *cmd; 4326deebe195SAndreas Gruenbacher 4327eefc2f7dSPhilipp Reisner drbd_thread_current_set_cpu(&tconn->receiver); 432869bc7bc3SAndreas Gruenbacher if (drbd_recv_header(tconn, &pi)) 432902918be2SPhilipp Reisner goto err_out; 433002918be2SPhilipp Reisner 4331deebe195SAndreas Gruenbacher cmd = &drbd_cmd_handler[pi.cmd]; 43324a76b161SAndreas Gruenbacher if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { 43332fcb8f30SAndreas Gruenbacher conn_err(tconn, "Unexpected data packet %s (0x%04x)", 43342fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.cmd); 433502918be2SPhilipp Reisner goto err_out; 43360b33a916SLars Ellenberg } 4337b411b363SPhilipp Reisner 4338e658983aSAndreas Gruenbacher shs = cmd->pkt_size; 4339e658983aSAndreas Gruenbacher if (pi.size > shs && !cmd->expect_payload) { 43402fcb8f30SAndreas Gruenbacher conn_err(tconn, "No payload expected %s l:%d\n", 43412fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.size); 4342c13f7e1aSLars Ellenberg goto err_out; 4343c13f7e1aSLars Ellenberg } 4344c13f7e1aSLars Ellenberg 4345c13f7e1aSLars Ellenberg if (shs) { 4346e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, pi.data, shs); 4347a5c31904SAndreas Gruenbacher if (err) 434802918be2SPhilipp Reisner goto err_out; 4349e2857216SAndreas Gruenbacher pi.size -= shs; 4350b411b363SPhilipp Reisner } 435102918be2SPhilipp Reisner 43524a76b161SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 43534a76b161SAndreas Gruenbacher if (err) { 43549f5bdc33SAndreas Gruenbacher conn_err(tconn, "error receiving %s, e: %d l: %d!\n", 43559f5bdc33SAndreas Gruenbacher cmdname(pi.cmd), err, pi.size); 435602918be2SPhilipp Reisner goto err_out; 4357b411b363SPhilipp Reisner } 4358b411b363SPhilipp Reisner } 435982bc0194SAndreas Gruenbacher return; 436002918be2SPhilipp Reisner 436102918be2SPhilipp Reisner err_out: 4362bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 4363b411b363SPhilipp Reisner } 4364b411b363SPhilipp Reisner 43650e29d163SPhilipp Reisner void conn_flush_workqueue(struct drbd_tconn *tconn) 4366b411b363SPhilipp Reisner { 4367b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 4368b411b363SPhilipp Reisner 4369b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 43700e29d163SPhilipp Reisner barr.w.tconn = tconn; 4371b411b363SPhilipp Reisner init_completion(&barr.done); 43720e29d163SPhilipp Reisner drbd_queue_work(&tconn->data.work, &barr.w); 4373b411b363SPhilipp Reisner wait_for_completion(&barr.done); 4374b411b363SPhilipp Reisner } 4375b411b363SPhilipp Reisner 437681fa2e67SPhilipp Reisner static void conn_disconnect(struct drbd_tconn *tconn) 4377b411b363SPhilipp Reisner { 4378c141ebdaSPhilipp Reisner struct drbd_conf *mdev; 4379bbeb641cSPhilipp Reisner enum drbd_conns oc; 4380376694a0SPhilipp Reisner int vnr; 4381b411b363SPhilipp Reisner 4382bbeb641cSPhilipp Reisner if (tconn->cstate == C_STANDALONE) 4383b411b363SPhilipp Reisner return; 4384b411b363SPhilipp Reisner 4385b8853dbdSPhilipp Reisner /* We are about to start the cleanup after connection loss. 4386b8853dbdSPhilipp Reisner * Make sure drbd_make_request knows about that. 4387b8853dbdSPhilipp Reisner * Usually we should be in some network failure state already, 4388b8853dbdSPhilipp Reisner * but just in case we are not, we fix it up here. 4389b8853dbdSPhilipp Reisner */ 4390b8853dbdSPhilipp Reisner conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); 4391b8853dbdSPhilipp Reisner 4392b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 4393360cc740SPhilipp Reisner drbd_thread_stop(&tconn->asender); 4394360cc740SPhilipp Reisner drbd_free_sock(tconn); 4395360cc740SPhilipp Reisner 4396c141ebdaSPhilipp Reisner rcu_read_lock(); 4397c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 4398c141ebdaSPhilipp Reisner kref_get(&mdev->kref); 4399c141ebdaSPhilipp Reisner rcu_read_unlock(); 4400c141ebdaSPhilipp Reisner drbd_disconnected(mdev); 4401c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 4402c141ebdaSPhilipp Reisner rcu_read_lock(); 4403c141ebdaSPhilipp Reisner } 4404c141ebdaSPhilipp Reisner rcu_read_unlock(); 4405c141ebdaSPhilipp Reisner 440612038a3aSPhilipp Reisner if (!list_empty(&tconn->current_epoch->list)) 440712038a3aSPhilipp Reisner conn_err(tconn, "ASSERTION FAILED: tconn->current_epoch->list not empty\n"); 440812038a3aSPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 440912038a3aSPhilipp Reisner atomic_set(&tconn->current_epoch->epoch_size, 0); 441012038a3aSPhilipp Reisner 4411360cc740SPhilipp Reisner conn_info(tconn, "Connection closed\n"); 4412360cc740SPhilipp Reisner 4413cb703454SPhilipp Reisner if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN) 4414cb703454SPhilipp Reisner conn_try_outdate_peer_async(tconn); 4415cb703454SPhilipp Reisner 4416360cc740SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 4417bbeb641cSPhilipp Reisner oc = tconn->cstate; 4418bbeb641cSPhilipp Reisner if (oc >= C_UNCONNECTED) 4419376694a0SPhilipp Reisner _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); 4420bbeb641cSPhilipp Reisner 4421360cc740SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 4422360cc740SPhilipp Reisner 4423f3dfa40aSLars Ellenberg if (oc == C_DISCONNECTING) 4424d9cc6e23SLars Ellenberg conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); 4425360cc740SPhilipp Reisner } 4426360cc740SPhilipp Reisner 4427c141ebdaSPhilipp Reisner static int drbd_disconnected(struct drbd_conf *mdev) 4428360cc740SPhilipp Reisner { 4429360cc740SPhilipp Reisner unsigned int i; 4430b411b363SPhilipp Reisner 443185719573SPhilipp Reisner /* wait for current activity to cease. */ 443287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4433b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 4434b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 4435b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 443687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4437b411b363SPhilipp Reisner 4438b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 4439b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 4440b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 4441b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 4442b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 4443b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 4444b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 4445b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 4446b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 4447b411b363SPhilipp Reisner * on the fly. */ 4448b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 4449b411b363SPhilipp Reisner mdev->rs_total = 0; 4450b411b363SPhilipp Reisner mdev->rs_failed = 0; 4451b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 4452b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 4453b411b363SPhilipp Reisner 4454b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 4455b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 4456b411b363SPhilipp Reisner 4457b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 4458b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 4459b411b363SPhilipp Reisner * to be "canceled" */ 4460a21e9298SPhilipp Reisner drbd_flush_workqueue(mdev); 4461b411b363SPhilipp Reisner 4462a990be46SAndreas Gruenbacher drbd_finish_peer_reqs(mdev); 4463b411b363SPhilipp Reisner 4464d10b4ea3SPhilipp Reisner /* This second workqueue flush is necessary, since drbd_finish_peer_reqs() 4465d10b4ea3SPhilipp Reisner might have issued a work again. The one before drbd_finish_peer_reqs() is 4466d10b4ea3SPhilipp Reisner necessary to reclain net_ee in drbd_finish_peer_reqs(). */ 4467d10b4ea3SPhilipp Reisner drbd_flush_workqueue(mdev); 4468d10b4ea3SPhilipp Reisner 4469b411b363SPhilipp Reisner kfree(mdev->p_uuid); 4470b411b363SPhilipp Reisner mdev->p_uuid = NULL; 4471b411b363SPhilipp Reisner 44722aebfabbSPhilipp Reisner if (!drbd_suspended(mdev)) 44732f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 4474b411b363SPhilipp Reisner 4475b411b363SPhilipp Reisner drbd_md_sync(mdev); 4476b411b363SPhilipp Reisner 447720ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 447820ceb2b2SLars Ellenberg * if any. */ 447920ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 448020ceb2b2SLars Ellenberg 4481b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 4482b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 4483b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 4484b411b363SPhilipp Reisner * 4485b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 4486b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 4487b411b363SPhilipp Reisner */ 44887721f567SAndreas Gruenbacher i = drbd_free_peer_reqs(mdev, &mdev->net_ee); 4489b411b363SPhilipp Reisner if (i) 4490b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 4491435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 4492435f0740SLars Ellenberg if (i) 4493435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 4494b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 4495b411b363SPhilipp Reisner if (i) 449645bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 4497b411b363SPhilipp Reisner 4498b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 4499b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 4500b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 4501b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 4502b411b363SPhilipp Reisner 4503360cc740SPhilipp Reisner return 0; 4504b411b363SPhilipp Reisner } 4505b411b363SPhilipp Reisner 4506b411b363SPhilipp Reisner /* 4507b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 4508b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 4509b411b363SPhilipp Reisner * 4510b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 4511b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 4512b411b363SPhilipp Reisner * 4513b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 4514b411b363SPhilipp Reisner */ 45156038178eSAndreas Gruenbacher static int drbd_send_features(struct drbd_tconn *tconn) 4516b411b363SPhilipp Reisner { 45179f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 45189f5bdc33SAndreas Gruenbacher struct p_connection_features *p; 4519b411b363SPhilipp Reisner 45209f5bdc33SAndreas Gruenbacher sock = &tconn->data; 45219f5bdc33SAndreas Gruenbacher p = conn_prepare_command(tconn, sock); 45229f5bdc33SAndreas Gruenbacher if (!p) 4523e8d17b01SAndreas Gruenbacher return -EIO; 4524b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 4525b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 4526b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 45279f5bdc33SAndreas Gruenbacher return conn_send_command(tconn, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); 4528b411b363SPhilipp Reisner } 4529b411b363SPhilipp Reisner 4530b411b363SPhilipp Reisner /* 4531b411b363SPhilipp Reisner * return values: 4532b411b363SPhilipp Reisner * 1 yes, we have a valid connection 4533b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 4534b411b363SPhilipp Reisner * -1 peer talks different language, 4535b411b363SPhilipp Reisner * no point in trying again, please go standalone. 4536b411b363SPhilipp Reisner */ 45376038178eSAndreas Gruenbacher static int drbd_do_features(struct drbd_tconn *tconn) 4538b411b363SPhilipp Reisner { 453965d11ed6SPhilipp Reisner /* ASSERT current == tconn->receiver ... */ 4540e658983aSAndreas Gruenbacher struct p_connection_features *p; 4541e658983aSAndreas Gruenbacher const int expect = sizeof(struct p_connection_features); 454277351055SPhilipp Reisner struct packet_info pi; 4543a5c31904SAndreas Gruenbacher int err; 4544b411b363SPhilipp Reisner 45456038178eSAndreas Gruenbacher err = drbd_send_features(tconn); 4546e8d17b01SAndreas Gruenbacher if (err) 4547b411b363SPhilipp Reisner return 0; 4548b411b363SPhilipp Reisner 454969bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 455069bc7bc3SAndreas Gruenbacher if (err) 4551b411b363SPhilipp Reisner return 0; 4552b411b363SPhilipp Reisner 45536038178eSAndreas Gruenbacher if (pi.cmd != P_CONNECTION_FEATURES) { 45546038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", 455577351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4556b411b363SPhilipp Reisner return -1; 4557b411b363SPhilipp Reisner } 4558b411b363SPhilipp Reisner 455977351055SPhilipp Reisner if (pi.size != expect) { 45606038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures length: %u, received: %u\n", 456177351055SPhilipp Reisner expect, pi.size); 4562b411b363SPhilipp Reisner return -1; 4563b411b363SPhilipp Reisner } 4564b411b363SPhilipp Reisner 4565e658983aSAndreas Gruenbacher p = pi.data; 4566e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, p, expect); 4567a5c31904SAndreas Gruenbacher if (err) 4568b411b363SPhilipp Reisner return 0; 4569b411b363SPhilipp Reisner 4570b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 4571b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 4572b411b363SPhilipp Reisner if (p->protocol_max == 0) 4573b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 4574b411b363SPhilipp Reisner 4575b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 4576b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 4577b411b363SPhilipp Reisner goto incompat; 4578b411b363SPhilipp Reisner 457965d11ed6SPhilipp Reisner tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 4580b411b363SPhilipp Reisner 458165d11ed6SPhilipp Reisner conn_info(tconn, "Handshake successful: " 458265d11ed6SPhilipp Reisner "Agreed network protocol version %d\n", tconn->agreed_pro_version); 4583b411b363SPhilipp Reisner 4584b411b363SPhilipp Reisner return 1; 4585b411b363SPhilipp Reisner 4586b411b363SPhilipp Reisner incompat: 458765d11ed6SPhilipp Reisner conn_err(tconn, "incompatible DRBD dialects: " 4588b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 4589b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 4590b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 4591b411b363SPhilipp Reisner return -1; 4592b411b363SPhilipp Reisner } 4593b411b363SPhilipp Reisner 4594b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 459513e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4596b411b363SPhilipp Reisner { 4597b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 4598b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 4599b10d96cbSJohannes Thoma return -1; 4600b411b363SPhilipp Reisner } 4601b411b363SPhilipp Reisner #else 4602b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4603b10d96cbSJohannes Thoma 4604b10d96cbSJohannes Thoma /* Return value: 4605b10d96cbSJohannes Thoma 1 - auth succeeded, 4606b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4607b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4608b10d96cbSJohannes Thoma */ 4609b10d96cbSJohannes Thoma 461013e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4611b411b363SPhilipp Reisner { 46129f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 4613b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4614b411b363SPhilipp Reisner struct scatterlist sg; 4615b411b363SPhilipp Reisner char *response = NULL; 4616b411b363SPhilipp Reisner char *right_response = NULL; 4617b411b363SPhilipp Reisner char *peers_ch = NULL; 461844ed167dSPhilipp Reisner unsigned int key_len; 461944ed167dSPhilipp Reisner char secret[SHARED_SECRET_MAX]; /* 64 byte */ 4620b411b363SPhilipp Reisner unsigned int resp_size; 4621b411b363SPhilipp Reisner struct hash_desc desc; 462277351055SPhilipp Reisner struct packet_info pi; 462344ed167dSPhilipp Reisner struct net_conf *nc; 462469bc7bc3SAndreas Gruenbacher int err, rv; 4625b411b363SPhilipp Reisner 46269f5bdc33SAndreas Gruenbacher /* FIXME: Put the challenge/response into the preallocated socket buffer. */ 46279f5bdc33SAndreas Gruenbacher 462844ed167dSPhilipp Reisner rcu_read_lock(); 462944ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 463044ed167dSPhilipp Reisner key_len = strlen(nc->shared_secret); 463144ed167dSPhilipp Reisner memcpy(secret, nc->shared_secret, key_len); 463244ed167dSPhilipp Reisner rcu_read_unlock(); 463344ed167dSPhilipp Reisner 463413e6037dSPhilipp Reisner desc.tfm = tconn->cram_hmac_tfm; 4635b411b363SPhilipp Reisner desc.flags = 0; 4636b411b363SPhilipp Reisner 463744ed167dSPhilipp Reisner rv = crypto_hash_setkey(tconn->cram_hmac_tfm, (u8 *)secret, key_len); 4638b411b363SPhilipp Reisner if (rv) { 463913e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); 4640b10d96cbSJohannes Thoma rv = -1; 4641b411b363SPhilipp Reisner goto fail; 4642b411b363SPhilipp Reisner } 4643b411b363SPhilipp Reisner 4644b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4645b411b363SPhilipp Reisner 46469f5bdc33SAndreas Gruenbacher sock = &tconn->data; 46479f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 46489f5bdc33SAndreas Gruenbacher rv = 0; 46499f5bdc33SAndreas Gruenbacher goto fail; 46509f5bdc33SAndreas Gruenbacher } 4651e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_CHALLENGE, 0, 46529f5bdc33SAndreas Gruenbacher my_challenge, CHALLENGE_LEN); 4653b411b363SPhilipp Reisner if (!rv) 4654b411b363SPhilipp Reisner goto fail; 4655b411b363SPhilipp Reisner 465669bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 465769bc7bc3SAndreas Gruenbacher if (err) { 465869bc7bc3SAndreas Gruenbacher rv = 0; 4659b411b363SPhilipp Reisner goto fail; 466069bc7bc3SAndreas Gruenbacher } 4661b411b363SPhilipp Reisner 466277351055SPhilipp Reisner if (pi.cmd != P_AUTH_CHALLENGE) { 466313e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", 466477351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4665b411b363SPhilipp Reisner rv = 0; 4666b411b363SPhilipp Reisner goto fail; 4667b411b363SPhilipp Reisner } 4668b411b363SPhilipp Reisner 466977351055SPhilipp Reisner if (pi.size > CHALLENGE_LEN * 2) { 467013e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge payload too big.\n"); 4671b10d96cbSJohannes Thoma rv = -1; 4672b411b363SPhilipp Reisner goto fail; 4673b411b363SPhilipp Reisner } 4674b411b363SPhilipp Reisner 467577351055SPhilipp Reisner peers_ch = kmalloc(pi.size, GFP_NOIO); 4676b411b363SPhilipp Reisner if (peers_ch == NULL) { 467713e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of peers_ch failed\n"); 4678b10d96cbSJohannes Thoma rv = -1; 4679b411b363SPhilipp Reisner goto fail; 4680b411b363SPhilipp Reisner } 4681b411b363SPhilipp Reisner 4682a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, peers_ch, pi.size); 4683a5c31904SAndreas Gruenbacher if (err) { 4684b411b363SPhilipp Reisner rv = 0; 4685b411b363SPhilipp Reisner goto fail; 4686b411b363SPhilipp Reisner } 4687b411b363SPhilipp Reisner 468813e6037dSPhilipp Reisner resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); 4689b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4690b411b363SPhilipp Reisner if (response == NULL) { 469113e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of response failed\n"); 4692b10d96cbSJohannes Thoma rv = -1; 4693b411b363SPhilipp Reisner goto fail; 4694b411b363SPhilipp Reisner } 4695b411b363SPhilipp Reisner 4696b411b363SPhilipp Reisner sg_init_table(&sg, 1); 469777351055SPhilipp Reisner sg_set_buf(&sg, peers_ch, pi.size); 4698b411b363SPhilipp Reisner 4699b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4700b411b363SPhilipp Reisner if (rv) { 470113e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4702b10d96cbSJohannes Thoma rv = -1; 4703b411b363SPhilipp Reisner goto fail; 4704b411b363SPhilipp Reisner } 4705b411b363SPhilipp Reisner 47069f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 47079f5bdc33SAndreas Gruenbacher rv = 0; 47089f5bdc33SAndreas Gruenbacher goto fail; 47099f5bdc33SAndreas Gruenbacher } 4710e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_RESPONSE, 0, 47119f5bdc33SAndreas Gruenbacher response, resp_size); 4712b411b363SPhilipp Reisner if (!rv) 4713b411b363SPhilipp Reisner goto fail; 4714b411b363SPhilipp Reisner 471569bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 471669bc7bc3SAndreas Gruenbacher if (err) { 471769bc7bc3SAndreas Gruenbacher rv = 0; 4718b411b363SPhilipp Reisner goto fail; 471969bc7bc3SAndreas Gruenbacher } 4720b411b363SPhilipp Reisner 472177351055SPhilipp Reisner if (pi.cmd != P_AUTH_RESPONSE) { 472213e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", 472377351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4724b411b363SPhilipp Reisner rv = 0; 4725b411b363SPhilipp Reisner goto fail; 4726b411b363SPhilipp Reisner } 4727b411b363SPhilipp Reisner 472877351055SPhilipp Reisner if (pi.size != resp_size) { 472913e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse payload of wrong size\n"); 4730b411b363SPhilipp Reisner rv = 0; 4731b411b363SPhilipp Reisner goto fail; 4732b411b363SPhilipp Reisner } 4733b411b363SPhilipp Reisner 4734a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, response , resp_size); 4735a5c31904SAndreas Gruenbacher if (err) { 4736b411b363SPhilipp Reisner rv = 0; 4737b411b363SPhilipp Reisner goto fail; 4738b411b363SPhilipp Reisner } 4739b411b363SPhilipp Reisner 4740b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 47412d1ee87dSJulia Lawall if (right_response == NULL) { 474213e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of right_response failed\n"); 4743b10d96cbSJohannes Thoma rv = -1; 4744b411b363SPhilipp Reisner goto fail; 4745b411b363SPhilipp Reisner } 4746b411b363SPhilipp Reisner 4747b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4748b411b363SPhilipp Reisner 4749b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4750b411b363SPhilipp Reisner if (rv) { 475113e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4752b10d96cbSJohannes Thoma rv = -1; 4753b411b363SPhilipp Reisner goto fail; 4754b411b363SPhilipp Reisner } 4755b411b363SPhilipp Reisner 4756b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4757b411b363SPhilipp Reisner 4758b411b363SPhilipp Reisner if (rv) 475944ed167dSPhilipp Reisner conn_info(tconn, "Peer authenticated using %d bytes HMAC\n", 476044ed167dSPhilipp Reisner resp_size); 4761b10d96cbSJohannes Thoma else 4762b10d96cbSJohannes Thoma rv = -1; 4763b411b363SPhilipp Reisner 4764b411b363SPhilipp Reisner fail: 4765b411b363SPhilipp Reisner kfree(peers_ch); 4766b411b363SPhilipp Reisner kfree(response); 4767b411b363SPhilipp Reisner kfree(right_response); 4768b411b363SPhilipp Reisner 4769b411b363SPhilipp Reisner return rv; 4770b411b363SPhilipp Reisner } 4771b411b363SPhilipp Reisner #endif 4772b411b363SPhilipp Reisner 4773b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4774b411b363SPhilipp Reisner { 4775392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 4776b411b363SPhilipp Reisner int h; 4777b411b363SPhilipp Reisner 47784d641dd7SPhilipp Reisner conn_info(tconn, "receiver (re)started\n"); 4779b411b363SPhilipp Reisner 4780b411b363SPhilipp Reisner do { 478181fa2e67SPhilipp Reisner h = conn_connect(tconn); 4782b411b363SPhilipp Reisner if (h == 0) { 478381fa2e67SPhilipp Reisner conn_disconnect(tconn); 478420ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4785b411b363SPhilipp Reisner } 4786b411b363SPhilipp Reisner if (h == -1) { 47874d641dd7SPhilipp Reisner conn_warn(tconn, "Discarding network configuration.\n"); 4788bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 4789b411b363SPhilipp Reisner } 4790b411b363SPhilipp Reisner } while (h == 0); 4791b411b363SPhilipp Reisner 479291fd4dadSPhilipp Reisner if (h > 0) 47934d641dd7SPhilipp Reisner drbdd(tconn); 4794b411b363SPhilipp Reisner 479581fa2e67SPhilipp Reisner conn_disconnect(tconn); 4796b411b363SPhilipp Reisner 47974d641dd7SPhilipp Reisner conn_info(tconn, "receiver terminated\n"); 4798b411b363SPhilipp Reisner return 0; 4799b411b363SPhilipp Reisner } 4800b411b363SPhilipp Reisner 4801b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4802b411b363SPhilipp Reisner 4803e05e1e59SAndreas Gruenbacher static int got_conn_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4804b411b363SPhilipp Reisner { 4805e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4806b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4807b411b363SPhilipp Reisner 4808fc3b10a4SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4809fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags); 4810fc3b10a4SPhilipp Reisner } else { 4811fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags); 4812fc3b10a4SPhilipp Reisner conn_err(tconn, "Requested state change failed by peer: %s (%d)\n", 4813fc3b10a4SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4814fc3b10a4SPhilipp Reisner } 4815fc3b10a4SPhilipp Reisner wake_up(&tconn->ping_wait); 4816e4f78edeSPhilipp Reisner 48172735a594SAndreas Gruenbacher return 0; 4818fc3b10a4SPhilipp Reisner } 4819e4f78edeSPhilipp Reisner 48201952e916SAndreas Gruenbacher static int got_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4821e4f78edeSPhilipp Reisner { 48221952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4823e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4824e4f78edeSPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4825e4f78edeSPhilipp Reisner 48261952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48271952e916SAndreas Gruenbacher if (!mdev) 48282735a594SAndreas Gruenbacher return -EIO; 48291952e916SAndreas Gruenbacher 4830e4f78edeSPhilipp Reisner if (retcode >= SS_SUCCESS) { 4831e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4832e4f78edeSPhilipp Reisner } else { 4833e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4834e4f78edeSPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4835e4f78edeSPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4836e4f78edeSPhilipp Reisner } 4837e4f78edeSPhilipp Reisner wake_up(&mdev->state_wait); 4838e4f78edeSPhilipp Reisner 48392735a594SAndreas Gruenbacher return 0; 4840b411b363SPhilipp Reisner } 4841b411b363SPhilipp Reisner 4842e05e1e59SAndreas Gruenbacher static int got_Ping(struct drbd_tconn *tconn, struct packet_info *pi) 4843b411b363SPhilipp Reisner { 48442735a594SAndreas Gruenbacher return drbd_send_ping_ack(tconn); 4845b411b363SPhilipp Reisner 4846b411b363SPhilipp Reisner } 4847b411b363SPhilipp Reisner 4848e05e1e59SAndreas Gruenbacher static int got_PingAck(struct drbd_tconn *tconn, struct packet_info *pi) 4849b411b363SPhilipp Reisner { 4850b411b363SPhilipp Reisner /* restore idle timeout */ 48512a67d8b9SPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; 48522a67d8b9SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) 48532a67d8b9SPhilipp Reisner wake_up(&tconn->ping_wait); 4854b411b363SPhilipp Reisner 48552735a594SAndreas Gruenbacher return 0; 4856b411b363SPhilipp Reisner } 4857b411b363SPhilipp Reisner 48581952e916SAndreas Gruenbacher static int got_IsInSync(struct drbd_tconn *tconn, struct packet_info *pi) 4859b411b363SPhilipp Reisner { 48601952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4861e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4862b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4863b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4864b411b363SPhilipp Reisner 48651952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48661952e916SAndreas Gruenbacher if (!mdev) 48672735a594SAndreas Gruenbacher return -EIO; 48681952e916SAndreas Gruenbacher 486931890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 4870b411b363SPhilipp Reisner 4871b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4872b411b363SPhilipp Reisner 48731d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4874b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4875b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4876b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4877b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 48781d53f09eSLars Ellenberg put_ldev(mdev); 48791d53f09eSLars Ellenberg } 4880b411b363SPhilipp Reisner dec_rs_pending(mdev); 4881778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4882b411b363SPhilipp Reisner 48832735a594SAndreas Gruenbacher return 0; 4884b411b363SPhilipp Reisner } 4885b411b363SPhilipp Reisner 4886bc9c5c41SAndreas Gruenbacher static int 4887bc9c5c41SAndreas Gruenbacher validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, 4888bc9c5c41SAndreas Gruenbacher struct rb_root *root, const char *func, 4889bc9c5c41SAndreas Gruenbacher enum drbd_req_event what, bool missing_ok) 4890b411b363SPhilipp Reisner { 4891b411b363SPhilipp Reisner struct drbd_request *req; 4892b411b363SPhilipp Reisner struct bio_and_error m; 4893b411b363SPhilipp Reisner 489487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4895bc9c5c41SAndreas Gruenbacher req = find_request(mdev, root, id, sector, missing_ok, func); 4896b411b363SPhilipp Reisner if (unlikely(!req)) { 489787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 489885997675SAndreas Gruenbacher return -EIO; 4899b411b363SPhilipp Reisner } 4900b411b363SPhilipp Reisner __req_mod(req, what, &m); 490187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4902b411b363SPhilipp Reisner 4903b411b363SPhilipp Reisner if (m.bio) 4904b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 490585997675SAndreas Gruenbacher return 0; 4906b411b363SPhilipp Reisner } 4907b411b363SPhilipp Reisner 49081952e916SAndreas Gruenbacher static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi) 4909b411b363SPhilipp Reisner { 49101952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4911e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4912b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4913b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4914b411b363SPhilipp Reisner enum drbd_req_event what; 4915b411b363SPhilipp Reisner 49161952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49171952e916SAndreas Gruenbacher if (!mdev) 49182735a594SAndreas Gruenbacher return -EIO; 49191952e916SAndreas Gruenbacher 4920b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4921b411b363SPhilipp Reisner 4922579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4923b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4924b411b363SPhilipp Reisner dec_rs_pending(mdev); 49252735a594SAndreas Gruenbacher return 0; 4926b411b363SPhilipp Reisner } 4927e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 4928b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 49298554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER_AND_SIS; 4930b411b363SPhilipp Reisner break; 4931b411b363SPhilipp Reisner case P_WRITE_ACK: 49328554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER; 4933b411b363SPhilipp Reisner break; 4934b411b363SPhilipp Reisner case P_RECV_ACK: 49358554df1cSAndreas Gruenbacher what = RECV_ACKED_BY_PEER; 4936b411b363SPhilipp Reisner break; 49377be8da07SAndreas Gruenbacher case P_DISCARD_WRITE: 49387be8da07SAndreas Gruenbacher what = DISCARD_WRITE; 49397be8da07SAndreas Gruenbacher break; 49407be8da07SAndreas Gruenbacher case P_RETRY_WRITE: 49417be8da07SAndreas Gruenbacher what = POSTPONE_WRITE; 4942b411b363SPhilipp Reisner break; 4943b411b363SPhilipp Reisner default: 49442735a594SAndreas Gruenbacher BUG(); 4945b411b363SPhilipp Reisner } 4946b411b363SPhilipp Reisner 49472735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 4948bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4949bc9c5c41SAndreas Gruenbacher what, false); 4950b411b363SPhilipp Reisner } 4951b411b363SPhilipp Reisner 49521952e916SAndreas Gruenbacher static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi) 4953b411b363SPhilipp Reisner { 49541952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4955e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4956b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 49572deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 495885997675SAndreas Gruenbacher int err; 4959b411b363SPhilipp Reisner 49601952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49611952e916SAndreas Gruenbacher if (!mdev) 49622735a594SAndreas Gruenbacher return -EIO; 49631952e916SAndreas Gruenbacher 4964b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4965b411b363SPhilipp Reisner 4966579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4967b411b363SPhilipp Reisner dec_rs_pending(mdev); 4968b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 49692735a594SAndreas Gruenbacher return 0; 4970b411b363SPhilipp Reisner } 49712deb8336SPhilipp Reisner 497285997675SAndreas Gruenbacher err = validate_req_change_req_state(mdev, p->block_id, sector, 4973bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4974303d1448SPhilipp Reisner NEG_ACKED, true); 497585997675SAndreas Gruenbacher if (err) { 49762deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 49772deb8336SPhilipp Reisner The master bio might already be completed, therefore the 4978c3afd8f5SAndreas Gruenbacher request is no longer in the collision hash. */ 49792deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 49802deb8336SPhilipp Reisner but then get a P_NEG_ACK afterwards. */ 4981c3afd8f5SAndreas Gruenbacher drbd_set_out_of_sync(mdev, sector, size); 49822deb8336SPhilipp Reisner } 49832735a594SAndreas Gruenbacher return 0; 4984b411b363SPhilipp Reisner } 4985b411b363SPhilipp Reisner 49861952e916SAndreas Gruenbacher static int got_NegDReply(struct drbd_tconn *tconn, struct packet_info *pi) 4987b411b363SPhilipp Reisner { 49881952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4989e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4990b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4991b411b363SPhilipp Reisner 49921952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49931952e916SAndreas Gruenbacher if (!mdev) 49942735a594SAndreas Gruenbacher return -EIO; 49951952e916SAndreas Gruenbacher 4996b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 49977be8da07SAndreas Gruenbacher 4998380207d0SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u.\n", 4999b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 5000b411b363SPhilipp Reisner 50012735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 5002bc9c5c41SAndreas Gruenbacher &mdev->read_requests, __func__, 50038554df1cSAndreas Gruenbacher NEG_ACKED, false); 5004b411b363SPhilipp Reisner } 5005b411b363SPhilipp Reisner 50061952e916SAndreas Gruenbacher static int got_NegRSDReply(struct drbd_tconn *tconn, struct packet_info *pi) 5007b411b363SPhilipp Reisner { 50081952e916SAndreas Gruenbacher struct drbd_conf *mdev; 5009b411b363SPhilipp Reisner sector_t sector; 5010b411b363SPhilipp Reisner int size; 5011e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 50121952e916SAndreas Gruenbacher 50131952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 50141952e916SAndreas Gruenbacher if (!mdev) 50152735a594SAndreas Gruenbacher return -EIO; 5016b411b363SPhilipp Reisner 5017b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 5018b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 5019b411b363SPhilipp Reisner 5020b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 5021b411b363SPhilipp Reisner 5022b411b363SPhilipp Reisner dec_rs_pending(mdev); 5023b411b363SPhilipp Reisner 5024b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 5025b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 5026e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 5027d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 5028b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 5029d612d309SPhilipp Reisner case P_RS_CANCEL: 5030d612d309SPhilipp Reisner break; 5031d612d309SPhilipp Reisner default: 50322735a594SAndreas Gruenbacher BUG(); 5033d612d309SPhilipp Reisner } 5034b411b363SPhilipp Reisner put_ldev(mdev); 5035b411b363SPhilipp Reisner } 5036b411b363SPhilipp Reisner 50372735a594SAndreas Gruenbacher return 0; 5038b411b363SPhilipp Reisner } 5039b411b363SPhilipp Reisner 50401952e916SAndreas Gruenbacher static int got_BarrierAck(struct drbd_tconn *tconn, struct packet_info *pi) 5041b411b363SPhilipp Reisner { 50421952e916SAndreas Gruenbacher struct drbd_conf *mdev; 5043e658983aSAndreas Gruenbacher struct p_barrier_ack *p = pi->data; 50441952e916SAndreas Gruenbacher 50451952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 50461952e916SAndreas Gruenbacher if (!mdev) 50472735a594SAndreas Gruenbacher return -EIO; 5048b411b363SPhilipp Reisner 50492f5cdd0bSPhilipp Reisner tl_release(mdev->tconn, p->barrier, be32_to_cpu(p->set_size)); 5050b411b363SPhilipp Reisner 5051c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 5052c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 505336baf611SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->flags)) { 5054370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 5055370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 5056c4752ef1SPhilipp Reisner } 5057c4752ef1SPhilipp Reisner 50582735a594SAndreas Gruenbacher return 0; 5059b411b363SPhilipp Reisner } 5060b411b363SPhilipp Reisner 50611952e916SAndreas Gruenbacher static int got_OVResult(struct drbd_tconn *tconn, struct packet_info *pi) 5062b411b363SPhilipp Reisner { 50631952e916SAndreas Gruenbacher struct drbd_conf *mdev; 5064e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 5065b411b363SPhilipp Reisner struct drbd_work *w; 5066b411b363SPhilipp Reisner sector_t sector; 5067b411b363SPhilipp Reisner int size; 5068b411b363SPhilipp Reisner 50691952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 50701952e916SAndreas Gruenbacher if (!mdev) 50712735a594SAndreas Gruenbacher return -EIO; 50721952e916SAndreas Gruenbacher 5073b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 5074b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 5075b411b363SPhilipp Reisner 5076b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 5077b411b363SPhilipp Reisner 5078b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 50798f7bed77SAndreas Gruenbacher drbd_ov_out_of_sync_found(mdev, sector, size); 5080b411b363SPhilipp Reisner else 50818f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 5082b411b363SPhilipp Reisner 50831d53f09eSLars Ellenberg if (!get_ldev(mdev)) 50842735a594SAndreas Gruenbacher return 0; 50851d53f09eSLars Ellenberg 5086b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 5087b411b363SPhilipp Reisner dec_rs_pending(mdev); 5088b411b363SPhilipp Reisner 5089ea5442afSLars Ellenberg --mdev->ov_left; 5090ea5442afSLars Ellenberg 5091ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 5092ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 5093ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 5094ea5442afSLars Ellenberg 5095ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 5096b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 5097b411b363SPhilipp Reisner if (w) { 5098b411b363SPhilipp Reisner w->cb = w_ov_finished; 5099a21e9298SPhilipp Reisner w->mdev = mdev; 5100e42325a5SPhilipp Reisner drbd_queue_work_front(&mdev->tconn->data.work, w); 5101b411b363SPhilipp Reisner } else { 5102b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 51038f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 5104b411b363SPhilipp Reisner drbd_resync_finished(mdev); 5105b411b363SPhilipp Reisner } 5106b411b363SPhilipp Reisner } 51071d53f09eSLars Ellenberg put_ldev(mdev); 51082735a594SAndreas Gruenbacher return 0; 5109b411b363SPhilipp Reisner } 5110b411b363SPhilipp Reisner 51111952e916SAndreas Gruenbacher static int got_skip(struct drbd_tconn *tconn, struct packet_info *pi) 51120ced55a3SPhilipp Reisner { 51132735a594SAndreas Gruenbacher return 0; 51140ced55a3SPhilipp Reisner } 51150ced55a3SPhilipp Reisner 5116a990be46SAndreas Gruenbacher static int tconn_finish_peer_reqs(struct drbd_tconn *tconn) 511732862ec7SPhilipp Reisner { 5118082a3439SPhilipp Reisner struct drbd_conf *mdev; 5119c141ebdaSPhilipp Reisner int vnr, not_empty = 0; 512032862ec7SPhilipp Reisner 512132862ec7SPhilipp Reisner do { 512232862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 512332862ec7SPhilipp Reisner flush_signals(current); 5124c141ebdaSPhilipp Reisner 5125c141ebdaSPhilipp Reisner rcu_read_lock(); 5126c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 5127c141ebdaSPhilipp Reisner kref_get(&mdev->kref); 5128c141ebdaSPhilipp Reisner rcu_read_unlock(); 5129d3fcb490SPhilipp Reisner if (drbd_finish_peer_reqs(mdev)) { 5130c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 5131c141ebdaSPhilipp Reisner return 1; 5132082a3439SPhilipp Reisner } 5133c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 5134c141ebdaSPhilipp Reisner rcu_read_lock(); 5135d3fcb490SPhilipp Reisner } 513632862ec7SPhilipp Reisner set_bit(SIGNAL_ASENDER, &tconn->flags); 5137082a3439SPhilipp Reisner 5138082a3439SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 5139c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 5140082a3439SPhilipp Reisner not_empty = !list_empty(&mdev->done_ee); 5141082a3439SPhilipp Reisner if (not_empty) 5142082a3439SPhilipp Reisner break; 5143082a3439SPhilipp Reisner } 5144082a3439SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 5145c141ebdaSPhilipp Reisner rcu_read_unlock(); 514632862ec7SPhilipp Reisner } while (not_empty); 514732862ec7SPhilipp Reisner 514832862ec7SPhilipp Reisner return 0; 514932862ec7SPhilipp Reisner } 515032862ec7SPhilipp Reisner 51517201b972SAndreas Gruenbacher struct asender_cmd { 51527201b972SAndreas Gruenbacher size_t pkt_size; 51531952e916SAndreas Gruenbacher int (*fn)(struct drbd_tconn *tconn, struct packet_info *); 51547201b972SAndreas Gruenbacher }; 51557201b972SAndreas Gruenbacher 51567201b972SAndreas Gruenbacher static struct asender_cmd asender_tbl[] = { 5157e658983aSAndreas Gruenbacher [P_PING] = { 0, got_Ping }, 5158e658983aSAndreas Gruenbacher [P_PING_ACK] = { 0, got_PingAck }, 51591952e916SAndreas Gruenbacher [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 51601952e916SAndreas Gruenbacher [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 51611952e916SAndreas Gruenbacher [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 51621952e916SAndreas Gruenbacher [P_DISCARD_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 51631952e916SAndreas Gruenbacher [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 51641952e916SAndreas Gruenbacher [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 51651952e916SAndreas Gruenbacher [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, 51661952e916SAndreas Gruenbacher [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 51671952e916SAndreas Gruenbacher [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 51681952e916SAndreas Gruenbacher [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 51691952e916SAndreas Gruenbacher [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 51701952e916SAndreas Gruenbacher [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 51711952e916SAndreas Gruenbacher [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, 51721952e916SAndreas Gruenbacher [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, 51731952e916SAndreas Gruenbacher [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 51747201b972SAndreas Gruenbacher }; 51757201b972SAndreas Gruenbacher 5176b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 5177b411b363SPhilipp Reisner { 5178392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 5179b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 518077351055SPhilipp Reisner struct packet_info pi; 5181257d0af6SPhilipp Reisner int rv; 5182e658983aSAndreas Gruenbacher void *buf = tconn->meta.rbuf; 5183b411b363SPhilipp Reisner int received = 0; 518452b061a4SAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 518552b061a4SAndreas Gruenbacher int expect = header_size; 518644ed167dSPhilipp Reisner bool ping_timeout_active = false; 518744ed167dSPhilipp Reisner struct net_conf *nc; 5188bb77d34eSAndreas Gruenbacher int ping_timeo, tcp_cork, ping_int; 5189b411b363SPhilipp Reisner 5190b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 5191b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 5192b411b363SPhilipp Reisner 5193e77a0a5cSAndreas Gruenbacher while (get_t_state(thi) == RUNNING) { 519480822284SPhilipp Reisner drbd_thread_current_set_cpu(thi); 519544ed167dSPhilipp Reisner 519644ed167dSPhilipp Reisner rcu_read_lock(); 519744ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 519844ed167dSPhilipp Reisner ping_timeo = nc->ping_timeo; 5199bb77d34eSAndreas Gruenbacher tcp_cork = nc->tcp_cork; 520044ed167dSPhilipp Reisner ping_int = nc->ping_int; 520144ed167dSPhilipp Reisner rcu_read_unlock(); 520244ed167dSPhilipp Reisner 520332862ec7SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &tconn->flags)) { 5204a17647aaSAndreas Gruenbacher if (drbd_send_ping(tconn)) { 520532862ec7SPhilipp Reisner conn_err(tconn, "drbd_send_ping has failed\n"); 5206841ce241SAndreas Gruenbacher goto reconnect; 5207841ce241SAndreas Gruenbacher } 520844ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_timeo * HZ / 10; 520944ed167dSPhilipp Reisner ping_timeout_active = true; 5210b411b363SPhilipp Reisner } 5211b411b363SPhilipp Reisner 521232862ec7SPhilipp Reisner /* TODO: conditionally cork; it may hurt latency if we cork without 521332862ec7SPhilipp Reisner much to send */ 5214bb77d34eSAndreas Gruenbacher if (tcp_cork) 521532862ec7SPhilipp Reisner drbd_tcp_cork(tconn->meta.socket); 5216a990be46SAndreas Gruenbacher if (tconn_finish_peer_reqs(tconn)) { 5217a990be46SAndreas Gruenbacher conn_err(tconn, "tconn_finish_peer_reqs() failed\n"); 5218b411b363SPhilipp Reisner goto reconnect; 5219082a3439SPhilipp Reisner } 5220b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 5221bb77d34eSAndreas Gruenbacher if (tcp_cork) 522232862ec7SPhilipp Reisner drbd_tcp_uncork(tconn->meta.socket); 5223b411b363SPhilipp Reisner 5224b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 5225b411b363SPhilipp Reisner if (signal_pending(current)) 5226b411b363SPhilipp Reisner continue; 5227b411b363SPhilipp Reisner 522832862ec7SPhilipp Reisner rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); 522932862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5230b411b363SPhilipp Reisner 5231b411b363SPhilipp Reisner flush_signals(current); 5232b411b363SPhilipp Reisner 5233b411b363SPhilipp Reisner /* Note: 5234b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 5235b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 5236b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 5237b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 5238b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 5239b411b363SPhilipp Reisner * rv == expected: full header or command 5240b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 5241b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 5242b411b363SPhilipp Reisner */ 5243b411b363SPhilipp Reisner if (likely(rv > 0)) { 5244b411b363SPhilipp Reisner received += rv; 5245b411b363SPhilipp Reisner buf += rv; 5246b411b363SPhilipp Reisner } else if (rv == 0) { 524732862ec7SPhilipp Reisner conn_err(tconn, "meta connection shut down by peer.\n"); 5248b411b363SPhilipp Reisner goto reconnect; 5249b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 5250cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 5251cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 525232862ec7SPhilipp Reisner if (time_after(tconn->last_received, 525332862ec7SPhilipp Reisner jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) 5254cb6518cbSLars Ellenberg continue; 5255f36af18cSLars Ellenberg if (ping_timeout_active) { 525632862ec7SPhilipp Reisner conn_err(tconn, "PingAck did not arrive in time.\n"); 5257b411b363SPhilipp Reisner goto reconnect; 5258b411b363SPhilipp Reisner } 525932862ec7SPhilipp Reisner set_bit(SEND_PING, &tconn->flags); 5260b411b363SPhilipp Reisner continue; 5261b411b363SPhilipp Reisner } else if (rv == -EINTR) { 5262b411b363SPhilipp Reisner continue; 5263b411b363SPhilipp Reisner } else { 526432862ec7SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 5265b411b363SPhilipp Reisner goto reconnect; 5266b411b363SPhilipp Reisner } 5267b411b363SPhilipp Reisner 5268b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 5269e658983aSAndreas Gruenbacher if (decode_header(tconn, tconn->meta.rbuf, &pi)) 5270b411b363SPhilipp Reisner goto reconnect; 52717201b972SAndreas Gruenbacher cmd = &asender_tbl[pi.cmd]; 52721952e916SAndreas Gruenbacher if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) { 52732fcb8f30SAndreas Gruenbacher conn_err(tconn, "Unexpected meta packet %s (0x%04x)\n", 52742fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.cmd); 5275b411b363SPhilipp Reisner goto disconnect; 5276b411b363SPhilipp Reisner } 5277e658983aSAndreas Gruenbacher expect = header_size + cmd->pkt_size; 527852b061a4SAndreas Gruenbacher if (pi.size != expect - header_size) { 527932862ec7SPhilipp Reisner conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", 528077351055SPhilipp Reisner pi.cmd, pi.size); 5281b411b363SPhilipp Reisner goto reconnect; 5282b411b363SPhilipp Reisner } 5283257d0af6SPhilipp Reisner } 5284b411b363SPhilipp Reisner if (received == expect) { 52852735a594SAndreas Gruenbacher bool err; 5286a4fbda8eSPhilipp Reisner 52872735a594SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 52882735a594SAndreas Gruenbacher if (err) { 52891952e916SAndreas Gruenbacher conn_err(tconn, "%pf failed\n", cmd->fn); 5290b411b363SPhilipp Reisner goto reconnect; 52911952e916SAndreas Gruenbacher } 5292b411b363SPhilipp Reisner 5293a4fbda8eSPhilipp Reisner tconn->last_received = jiffies; 5294a4fbda8eSPhilipp Reisner 529544ed167dSPhilipp Reisner if (cmd == &asender_tbl[P_PING_ACK]) { 529644ed167dSPhilipp Reisner /* restore idle timeout */ 529744ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_int * HZ; 529844ed167dSPhilipp Reisner ping_timeout_active = false; 529944ed167dSPhilipp Reisner } 5300f36af18cSLars Ellenberg 5301e658983aSAndreas Gruenbacher buf = tconn->meta.rbuf; 5302b411b363SPhilipp Reisner received = 0; 530352b061a4SAndreas Gruenbacher expect = header_size; 5304b411b363SPhilipp Reisner cmd = NULL; 5305b411b363SPhilipp Reisner } 5306b411b363SPhilipp Reisner } 5307b411b363SPhilipp Reisner 5308b411b363SPhilipp Reisner if (0) { 5309b411b363SPhilipp Reisner reconnect: 5310bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); 5311b411b363SPhilipp Reisner } 5312b411b363SPhilipp Reisner if (0) { 5313b411b363SPhilipp Reisner disconnect: 5314bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 5315b411b363SPhilipp Reisner } 531632862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5317b411b363SPhilipp Reisner 531832862ec7SPhilipp Reisner conn_info(tconn, "asender terminated\n"); 5319b411b363SPhilipp Reisner 5320b411b363SPhilipp Reisner return 0; 5321b411b363SPhilipp Reisner } 5322