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; 490dd9b3604SPhilipp Reisner __module_get((*newsock)->ops->owner); 491b411b363SPhilipp Reisner 492b411b363SPhilipp Reisner out: 493b411b363SPhilipp Reisner return err; 494b411b363SPhilipp Reisner } 495b411b363SPhilipp Reisner 496dbd9eea0SPhilipp Reisner static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) 497b411b363SPhilipp Reisner { 498b411b363SPhilipp Reisner mm_segment_t oldfs; 499b411b363SPhilipp Reisner struct kvec iov = { 500b411b363SPhilipp Reisner .iov_base = buf, 501b411b363SPhilipp Reisner .iov_len = size, 502b411b363SPhilipp Reisner }; 503b411b363SPhilipp Reisner struct msghdr msg = { 504b411b363SPhilipp Reisner .msg_iovlen = 1, 505b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 506b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 507b411b363SPhilipp Reisner }; 508b411b363SPhilipp Reisner int rv; 509b411b363SPhilipp Reisner 510b411b363SPhilipp Reisner oldfs = get_fs(); 511b411b363SPhilipp Reisner set_fs(KERNEL_DS); 512b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 513b411b363SPhilipp Reisner set_fs(oldfs); 514b411b363SPhilipp Reisner 515b411b363SPhilipp Reisner return rv; 516b411b363SPhilipp Reisner } 517b411b363SPhilipp Reisner 518de0ff338SPhilipp Reisner static int drbd_recv(struct drbd_tconn *tconn, void *buf, size_t size) 519b411b363SPhilipp Reisner { 520b411b363SPhilipp Reisner mm_segment_t oldfs; 521b411b363SPhilipp Reisner struct kvec iov = { 522b411b363SPhilipp Reisner .iov_base = buf, 523b411b363SPhilipp Reisner .iov_len = size, 524b411b363SPhilipp Reisner }; 525b411b363SPhilipp Reisner struct msghdr msg = { 526b411b363SPhilipp Reisner .msg_iovlen = 1, 527b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 528b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 529b411b363SPhilipp Reisner }; 530b411b363SPhilipp Reisner int rv; 531b411b363SPhilipp Reisner 532b411b363SPhilipp Reisner oldfs = get_fs(); 533b411b363SPhilipp Reisner set_fs(KERNEL_DS); 534b411b363SPhilipp Reisner 535b411b363SPhilipp Reisner for (;;) { 536de0ff338SPhilipp Reisner rv = sock_recvmsg(tconn->data.socket, &msg, size, msg.msg_flags); 537b411b363SPhilipp Reisner if (rv == size) 538b411b363SPhilipp Reisner break; 539b411b363SPhilipp Reisner 540b411b363SPhilipp Reisner /* Note: 541b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 542b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 543b411b363SPhilipp Reisner */ 544b411b363SPhilipp Reisner 545b411b363SPhilipp Reisner if (rv < 0) { 546b411b363SPhilipp Reisner if (rv == -ECONNRESET) 547de0ff338SPhilipp Reisner conn_info(tconn, "sock was reset by peer\n"); 548b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 549de0ff338SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 550b411b363SPhilipp Reisner break; 551b411b363SPhilipp Reisner } else if (rv == 0) { 552de0ff338SPhilipp Reisner conn_info(tconn, "sock was shut down by peer\n"); 553b411b363SPhilipp Reisner break; 554b411b363SPhilipp Reisner } else { 555b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 556b411b363SPhilipp Reisner * after we read a partial message 557b411b363SPhilipp Reisner */ 558b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 559b411b363SPhilipp Reisner break; 560b411b363SPhilipp Reisner } 561b411b363SPhilipp Reisner }; 562b411b363SPhilipp Reisner 563b411b363SPhilipp Reisner set_fs(oldfs); 564b411b363SPhilipp Reisner 565b411b363SPhilipp Reisner if (rv != size) 566bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); 567b411b363SPhilipp Reisner 568b411b363SPhilipp Reisner return rv; 569b411b363SPhilipp Reisner } 570b411b363SPhilipp Reisner 571c6967746SAndreas Gruenbacher static int drbd_recv_all(struct drbd_tconn *tconn, void *buf, size_t size) 572c6967746SAndreas Gruenbacher { 573c6967746SAndreas Gruenbacher int err; 574c6967746SAndreas Gruenbacher 575c6967746SAndreas Gruenbacher err = drbd_recv(tconn, buf, size); 576c6967746SAndreas Gruenbacher if (err != size) { 577c6967746SAndreas Gruenbacher if (err >= 0) 578c6967746SAndreas Gruenbacher err = -EIO; 579c6967746SAndreas Gruenbacher } else 580c6967746SAndreas Gruenbacher err = 0; 581c6967746SAndreas Gruenbacher return err; 582c6967746SAndreas Gruenbacher } 583c6967746SAndreas Gruenbacher 584a5c31904SAndreas Gruenbacher static int drbd_recv_all_warn(struct drbd_tconn *tconn, void *buf, size_t size) 585a5c31904SAndreas Gruenbacher { 586a5c31904SAndreas Gruenbacher int err; 587a5c31904SAndreas Gruenbacher 588a5c31904SAndreas Gruenbacher err = drbd_recv_all(tconn, buf, size); 589a5c31904SAndreas Gruenbacher if (err && !signal_pending(current)) 590a5c31904SAndreas Gruenbacher conn_warn(tconn, "short read (expected size %d)\n", (int)size); 591a5c31904SAndreas Gruenbacher return err; 592a5c31904SAndreas Gruenbacher } 593a5c31904SAndreas Gruenbacher 5945dbf1673SLars Ellenberg /* quoting tcp(7): 5955dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5965dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5975dbf1673SLars Ellenberg * This is our wrapper to do so. 5985dbf1673SLars Ellenberg */ 5995dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 6005dbf1673SLars Ellenberg unsigned int rcv) 6015dbf1673SLars Ellenberg { 6025dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 6035dbf1673SLars Ellenberg if (snd) { 6045dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 6055dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 6065dbf1673SLars Ellenberg } 6075dbf1673SLars Ellenberg if (rcv) { 6085dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 6095dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 6105dbf1673SLars Ellenberg } 6115dbf1673SLars Ellenberg } 6125dbf1673SLars Ellenberg 613eac3e990SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_tconn *tconn) 614b411b363SPhilipp Reisner { 615b411b363SPhilipp Reisner const char *what; 616b411b363SPhilipp Reisner struct socket *sock; 617b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 61844ed167dSPhilipp Reisner struct sockaddr_in6 peer_in6; 61944ed167dSPhilipp Reisner struct net_conf *nc; 62044ed167dSPhilipp Reisner int err, peer_addr_len, my_addr_len; 62169ef82deSAndreas Gruenbacher int sndbuf_size, rcvbuf_size, connect_int; 622b411b363SPhilipp Reisner int disconnect_on_error = 1; 623b411b363SPhilipp Reisner 62444ed167dSPhilipp Reisner rcu_read_lock(); 62544ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 62644ed167dSPhilipp Reisner if (!nc) { 62744ed167dSPhilipp Reisner rcu_read_unlock(); 628b411b363SPhilipp Reisner return NULL; 62944ed167dSPhilipp Reisner } 63044ed167dSPhilipp Reisner sndbuf_size = nc->sndbuf_size; 63144ed167dSPhilipp Reisner rcvbuf_size = nc->rcvbuf_size; 63269ef82deSAndreas Gruenbacher connect_int = nc->connect_int; 633089c075dSAndreas Gruenbacher rcu_read_unlock(); 63444ed167dSPhilipp Reisner 635089c075dSAndreas Gruenbacher my_addr_len = min_t(int, tconn->my_addr_len, sizeof(src_in6)); 636089c075dSAndreas Gruenbacher memcpy(&src_in6, &tconn->my_addr, my_addr_len); 63744ed167dSPhilipp Reisner 638089c075dSAndreas Gruenbacher if (((struct sockaddr *)&tconn->my_addr)->sa_family == AF_INET6) 63944ed167dSPhilipp Reisner src_in6.sin6_port = 0; 64044ed167dSPhilipp Reisner else 64144ed167dSPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 64244ed167dSPhilipp Reisner 643089c075dSAndreas Gruenbacher peer_addr_len = min_t(int, tconn->peer_addr_len, sizeof(src_in6)); 644089c075dSAndreas Gruenbacher memcpy(&peer_in6, &tconn->peer_addr, peer_addr_len); 645b411b363SPhilipp Reisner 646b411b363SPhilipp Reisner what = "sock_create_kern"; 64744ed167dSPhilipp Reisner err = sock_create_kern(((struct sockaddr *)&src_in6)->sa_family, 648b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 649b411b363SPhilipp Reisner if (err < 0) { 650b411b363SPhilipp Reisner sock = NULL; 651b411b363SPhilipp Reisner goto out; 652b411b363SPhilipp Reisner } 653b411b363SPhilipp Reisner 654b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 65569ef82deSAndreas Gruenbacher sock->sk->sk_sndtimeo = connect_int * HZ; 65644ed167dSPhilipp Reisner drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); 657b411b363SPhilipp Reisner 658b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 659b411b363SPhilipp Reisner * for the outgoing connections. 660b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 661b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 662b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 663b411b363SPhilipp Reisner * a free one dynamically. 664b411b363SPhilipp Reisner */ 665b411b363SPhilipp Reisner what = "bind before connect"; 66644ed167dSPhilipp Reisner err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); 667b411b363SPhilipp Reisner if (err < 0) 668b411b363SPhilipp Reisner goto out; 669b411b363SPhilipp Reisner 670b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 671b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 672b411b363SPhilipp Reisner disconnect_on_error = 0; 673b411b363SPhilipp Reisner what = "connect"; 67444ed167dSPhilipp Reisner err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); 675b411b363SPhilipp Reisner 676b411b363SPhilipp Reisner out: 677b411b363SPhilipp Reisner if (err < 0) { 678b411b363SPhilipp Reisner if (sock) { 679b411b363SPhilipp Reisner sock_release(sock); 680b411b363SPhilipp Reisner sock = NULL; 681b411b363SPhilipp Reisner } 682b411b363SPhilipp Reisner switch (-err) { 683b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 684b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 685b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 686b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 687b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 688b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 689b411b363SPhilipp Reisner disconnect_on_error = 0; 690b411b363SPhilipp Reisner break; 691b411b363SPhilipp Reisner default: 692eac3e990SPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 693b411b363SPhilipp Reisner } 694b411b363SPhilipp Reisner if (disconnect_on_error) 695bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 696b411b363SPhilipp Reisner } 69744ed167dSPhilipp Reisner 698b411b363SPhilipp Reisner return sock; 699b411b363SPhilipp Reisner } 700b411b363SPhilipp Reisner 7017653620dSPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_tconn *tconn) 702b411b363SPhilipp Reisner { 70344ed167dSPhilipp Reisner int timeo, err, my_addr_len; 70469ef82deSAndreas Gruenbacher int sndbuf_size, rcvbuf_size, connect_int; 705b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 70644ed167dSPhilipp Reisner struct sockaddr_in6 my_addr; 70744ed167dSPhilipp Reisner struct net_conf *nc; 708b411b363SPhilipp Reisner const char *what; 709b411b363SPhilipp Reisner 71044ed167dSPhilipp Reisner rcu_read_lock(); 71144ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 71244ed167dSPhilipp Reisner if (!nc) { 71344ed167dSPhilipp Reisner rcu_read_unlock(); 714b411b363SPhilipp Reisner return NULL; 71544ed167dSPhilipp Reisner } 71644ed167dSPhilipp Reisner sndbuf_size = nc->sndbuf_size; 71744ed167dSPhilipp Reisner rcvbuf_size = nc->rcvbuf_size; 71869ef82deSAndreas Gruenbacher connect_int = nc->connect_int; 71944ed167dSPhilipp Reisner rcu_read_unlock(); 720b411b363SPhilipp Reisner 721089c075dSAndreas Gruenbacher my_addr_len = min_t(int, tconn->my_addr_len, sizeof(struct sockaddr_in6)); 722089c075dSAndreas Gruenbacher memcpy(&my_addr, &tconn->my_addr, my_addr_len); 723089c075dSAndreas Gruenbacher 724b411b363SPhilipp Reisner what = "sock_create_kern"; 72544ed167dSPhilipp Reisner err = sock_create_kern(((struct sockaddr *)&my_addr)->sa_family, 726b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 727b411b363SPhilipp Reisner if (err) { 728b411b363SPhilipp Reisner s_listen = NULL; 729b411b363SPhilipp Reisner goto out; 730b411b363SPhilipp Reisner } 731b411b363SPhilipp Reisner 73269ef82deSAndreas Gruenbacher timeo = connect_int * HZ; 733b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 734b411b363SPhilipp Reisner 735b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 736b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 737b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 73844ed167dSPhilipp Reisner drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); 739b411b363SPhilipp Reisner 740b411b363SPhilipp Reisner what = "bind before listen"; 74144ed167dSPhilipp Reisner err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); 742b411b363SPhilipp Reisner if (err < 0) 743b411b363SPhilipp Reisner goto out; 744b411b363SPhilipp Reisner 7457653620dSPhilipp Reisner err = drbd_accept(&what, s_listen, &s_estab); 746b411b363SPhilipp Reisner 747b411b363SPhilipp Reisner out: 748b411b363SPhilipp Reisner if (s_listen) 749b411b363SPhilipp Reisner sock_release(s_listen); 750b411b363SPhilipp Reisner if (err < 0) { 751b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 7527653620dSPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 753bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 754b411b363SPhilipp Reisner } 755b411b363SPhilipp Reisner } 756b411b363SPhilipp Reisner 757b411b363SPhilipp Reisner return s_estab; 758b411b363SPhilipp Reisner } 759b411b363SPhilipp Reisner 760e658983aSAndreas Gruenbacher static int decode_header(struct drbd_tconn *, void *, struct packet_info *); 761b411b363SPhilipp Reisner 7629f5bdc33SAndreas Gruenbacher static int send_first_packet(struct drbd_tconn *tconn, struct drbd_socket *sock, 7639f5bdc33SAndreas Gruenbacher enum drbd_packet cmd) 7649f5bdc33SAndreas Gruenbacher { 7659f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) 7669f5bdc33SAndreas Gruenbacher return -EIO; 767e658983aSAndreas Gruenbacher return conn_send_command(tconn, sock, cmd, 0, NULL, 0); 768b411b363SPhilipp Reisner } 769b411b363SPhilipp Reisner 7709f5bdc33SAndreas Gruenbacher static int receive_first_packet(struct drbd_tconn *tconn, struct socket *sock) 771b411b363SPhilipp Reisner { 7729f5bdc33SAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 7739f5bdc33SAndreas Gruenbacher struct packet_info pi; 7749f5bdc33SAndreas Gruenbacher int err; 775b411b363SPhilipp Reisner 7769f5bdc33SAndreas Gruenbacher err = drbd_recv_short(sock, tconn->data.rbuf, header_size, 0); 7779f5bdc33SAndreas Gruenbacher if (err != header_size) { 7789f5bdc33SAndreas Gruenbacher if (err >= 0) 7799f5bdc33SAndreas Gruenbacher err = -EIO; 7809f5bdc33SAndreas Gruenbacher return err; 7819f5bdc33SAndreas Gruenbacher } 7829f5bdc33SAndreas Gruenbacher err = decode_header(tconn, tconn->data.rbuf, &pi); 7839f5bdc33SAndreas Gruenbacher if (err) 7849f5bdc33SAndreas Gruenbacher return err; 7859f5bdc33SAndreas Gruenbacher return pi.cmd; 786b411b363SPhilipp Reisner } 787b411b363SPhilipp Reisner 788b411b363SPhilipp Reisner /** 789b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 790b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 791b411b363SPhilipp Reisner */ 792dbd9eea0SPhilipp Reisner static int drbd_socket_okay(struct socket **sock) 793b411b363SPhilipp Reisner { 794b411b363SPhilipp Reisner int rr; 795b411b363SPhilipp Reisner char tb[4]; 796b411b363SPhilipp Reisner 797b411b363SPhilipp Reisner if (!*sock) 79881e84650SAndreas Gruenbacher return false; 799b411b363SPhilipp Reisner 800dbd9eea0SPhilipp Reisner rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 801b411b363SPhilipp Reisner 802b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 80381e84650SAndreas Gruenbacher return true; 804b411b363SPhilipp Reisner } else { 805b411b363SPhilipp Reisner sock_release(*sock); 806b411b363SPhilipp Reisner *sock = NULL; 80781e84650SAndreas Gruenbacher return false; 808b411b363SPhilipp Reisner } 809b411b363SPhilipp Reisner } 8102325eb66SPhilipp Reisner /* Gets called if a connection is established, or if a new minor gets created 8112325eb66SPhilipp Reisner in a connection */ 812c141ebdaSPhilipp Reisner int drbd_connected(struct drbd_conf *mdev) 813907599e0SPhilipp Reisner { 8140829f5edSAndreas Gruenbacher int err; 815907599e0SPhilipp Reisner 816907599e0SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 817907599e0SPhilipp Reisner mdev->peer_seq = 0; 818907599e0SPhilipp Reisner 8198410da8fSPhilipp Reisner mdev->state_mutex = mdev->tconn->agreed_pro_version < 100 ? 8208410da8fSPhilipp Reisner &mdev->tconn->cstate_mutex : 8218410da8fSPhilipp Reisner &mdev->own_state_mutex; 8228410da8fSPhilipp Reisner 8230829f5edSAndreas Gruenbacher err = drbd_send_sync_param(mdev); 8240829f5edSAndreas Gruenbacher if (!err) 8250829f5edSAndreas Gruenbacher err = drbd_send_sizes(mdev, 0, 0); 8260829f5edSAndreas Gruenbacher if (!err) 8270829f5edSAndreas Gruenbacher err = drbd_send_uuids(mdev); 8280829f5edSAndreas Gruenbacher if (!err) 82943de7c85SPhilipp Reisner err = drbd_send_current_state(mdev); 830907599e0SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 831907599e0SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 8328b924f1dSPhilipp Reisner mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ 8330829f5edSAndreas Gruenbacher return err; 834907599e0SPhilipp Reisner } 835907599e0SPhilipp Reisner 836b411b363SPhilipp Reisner /* 837b411b363SPhilipp Reisner * return values: 838b411b363SPhilipp Reisner * 1 yes, we have a valid connection 839b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 840b411b363SPhilipp Reisner * -1 peer talks different language, 841b411b363SPhilipp Reisner * no point in trying again, please go standalone. 842b411b363SPhilipp Reisner * -2 We do not have a network config... 843b411b363SPhilipp Reisner */ 84481fa2e67SPhilipp Reisner static int conn_connect(struct drbd_tconn *tconn) 845b411b363SPhilipp Reisner { 8467da35862SPhilipp Reisner struct drbd_socket sock, msock; 847c141ebdaSPhilipp Reisner struct drbd_conf *mdev; 84844ed167dSPhilipp Reisner struct net_conf *nc; 849c141ebdaSPhilipp Reisner int vnr, timeout, try, h, ok; 85008b165baSPhilipp Reisner bool discard_my_data; 851b411b363SPhilipp Reisner 852bbeb641cSPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) 853b411b363SPhilipp Reisner return -2; 854b411b363SPhilipp Reisner 8557da35862SPhilipp Reisner mutex_init(&sock.mutex); 8567da35862SPhilipp Reisner sock.sbuf = tconn->data.sbuf; 8577da35862SPhilipp Reisner sock.rbuf = tconn->data.rbuf; 8587da35862SPhilipp Reisner sock.socket = NULL; 8597da35862SPhilipp Reisner mutex_init(&msock.mutex); 8607da35862SPhilipp Reisner msock.sbuf = tconn->meta.sbuf; 8617da35862SPhilipp Reisner msock.rbuf = tconn->meta.rbuf; 8627da35862SPhilipp Reisner msock.socket = NULL; 8637da35862SPhilipp Reisner 864907599e0SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &tconn->flags); 8650916e0e3SAndreas Gruenbacher 8660916e0e3SAndreas Gruenbacher /* Assume that the peer only understands protocol 80 until we know better. */ 8670916e0e3SAndreas Gruenbacher tconn->agreed_pro_version = 80; 868b411b363SPhilipp Reisner 869b411b363SPhilipp Reisner do { 8702bf89621SAndreas Gruenbacher struct socket *s; 8712bf89621SAndreas Gruenbacher 872b411b363SPhilipp Reisner for (try = 0;;) { 873b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 874907599e0SPhilipp Reisner s = drbd_try_connect(tconn); 875b411b363SPhilipp Reisner if (s || ++try >= 3) 876b411b363SPhilipp Reisner break; 877b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 87820ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 879b411b363SPhilipp Reisner } 880b411b363SPhilipp Reisner 881b411b363SPhilipp Reisner if (s) { 8827da35862SPhilipp Reisner if (!sock.socket) { 8837da35862SPhilipp Reisner sock.socket = s; 8847da35862SPhilipp Reisner send_first_packet(tconn, &sock, P_INITIAL_DATA); 8857da35862SPhilipp Reisner } else if (!msock.socket) { 8867da35862SPhilipp Reisner msock.socket = s; 8877da35862SPhilipp Reisner send_first_packet(tconn, &msock, P_INITIAL_META); 888b411b363SPhilipp Reisner } else { 88981fa2e67SPhilipp Reisner conn_err(tconn, "Logic error in conn_connect()\n"); 890b411b363SPhilipp Reisner goto out_release_sockets; 891b411b363SPhilipp Reisner } 892b411b363SPhilipp Reisner } 893b411b363SPhilipp Reisner 8947da35862SPhilipp Reisner if (sock.socket && msock.socket) { 8957da35862SPhilipp Reisner rcu_read_lock(); 8967da35862SPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 8977da35862SPhilipp Reisner timeout = nc->ping_timeo * HZ / 10; 8987da35862SPhilipp Reisner rcu_read_unlock(); 8997da35862SPhilipp Reisner schedule_timeout_interruptible(timeout); 9007da35862SPhilipp Reisner ok = drbd_socket_okay(&sock.socket); 9017da35862SPhilipp Reisner ok = drbd_socket_okay(&msock.socket) && ok; 902b411b363SPhilipp Reisner if (ok) 903b411b363SPhilipp Reisner break; 904b411b363SPhilipp Reisner } 905b411b363SPhilipp Reisner 906b411b363SPhilipp Reisner retry: 907907599e0SPhilipp Reisner s = drbd_wait_for_connect(tconn); 908b411b363SPhilipp Reisner if (s) { 9099f5bdc33SAndreas Gruenbacher try = receive_first_packet(tconn, s); 9107da35862SPhilipp Reisner drbd_socket_okay(&sock.socket); 9117da35862SPhilipp Reisner drbd_socket_okay(&msock.socket); 912b411b363SPhilipp Reisner switch (try) { 913e5d6f33aSAndreas Gruenbacher case P_INITIAL_DATA: 9147da35862SPhilipp Reisner if (sock.socket) { 915907599e0SPhilipp Reisner conn_warn(tconn, "initial packet S crossed\n"); 9167da35862SPhilipp Reisner sock_release(sock.socket); 917b411b363SPhilipp Reisner } 9187da35862SPhilipp Reisner sock.socket = s; 919b411b363SPhilipp Reisner break; 920e5d6f33aSAndreas Gruenbacher case P_INITIAL_META: 9217da35862SPhilipp Reisner if (msock.socket) { 922907599e0SPhilipp Reisner conn_warn(tconn, "initial packet M crossed\n"); 9237da35862SPhilipp Reisner sock_release(msock.socket); 924b411b363SPhilipp Reisner } 9257da35862SPhilipp Reisner msock.socket = s; 926907599e0SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &tconn->flags); 927b411b363SPhilipp Reisner break; 928b411b363SPhilipp Reisner default: 929907599e0SPhilipp Reisner conn_warn(tconn, "Error receiving initial packet\n"); 930b411b363SPhilipp Reisner sock_release(s); 931b411b363SPhilipp Reisner if (random32() & 1) 932b411b363SPhilipp Reisner goto retry; 933b411b363SPhilipp Reisner } 934b411b363SPhilipp Reisner } 935b411b363SPhilipp Reisner 936bbeb641cSPhilipp Reisner if (tconn->cstate <= C_DISCONNECTING) 937b411b363SPhilipp Reisner goto out_release_sockets; 938b411b363SPhilipp Reisner if (signal_pending(current)) { 939b411b363SPhilipp Reisner flush_signals(current); 940b411b363SPhilipp Reisner smp_rmb(); 941907599e0SPhilipp Reisner if (get_t_state(&tconn->receiver) == EXITING) 942b411b363SPhilipp Reisner goto out_release_sockets; 943b411b363SPhilipp Reisner } 944b411b363SPhilipp Reisner 9457da35862SPhilipp Reisner if (sock.socket && &msock.socket) { 9467da35862SPhilipp Reisner ok = drbd_socket_okay(&sock.socket); 9477da35862SPhilipp Reisner ok = drbd_socket_okay(&msock.socket) && ok; 948b411b363SPhilipp Reisner if (ok) 949b411b363SPhilipp Reisner break; 950b411b363SPhilipp Reisner } 951b411b363SPhilipp Reisner } while (1); 952b411b363SPhilipp Reisner 9537da35862SPhilipp Reisner sock.socket->sk->sk_reuse = 1; /* SO_REUSEADDR */ 9547da35862SPhilipp Reisner msock.socket->sk->sk_reuse = 1; /* SO_REUSEADDR */ 9552bf89621SAndreas Gruenbacher 9567da35862SPhilipp Reisner sock.socket->sk->sk_allocation = GFP_NOIO; 9577da35862SPhilipp Reisner msock.socket->sk->sk_allocation = GFP_NOIO; 958b411b363SPhilipp Reisner 9597da35862SPhilipp Reisner sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 9607da35862SPhilipp Reisner msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE; 961b411b363SPhilipp Reisner 962b411b363SPhilipp Reisner /* NOT YET ... 9637da35862SPhilipp Reisner * sock.socket->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; 9647da35862SPhilipp Reisner * sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 9656038178eSAndreas Gruenbacher * first set it to the P_CONNECTION_FEATURES timeout, 966b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 96744ed167dSPhilipp Reisner rcu_read_lock(); 96844ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 969b411b363SPhilipp Reisner 9707da35862SPhilipp Reisner sock.socket->sk->sk_sndtimeo = 9717da35862SPhilipp Reisner sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; 97244ed167dSPhilipp Reisner 9737da35862SPhilipp Reisner msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ; 97444ed167dSPhilipp Reisner timeout = nc->timeout * HZ / 10; 97508b165baSPhilipp Reisner discard_my_data = nc->discard_my_data; 97644ed167dSPhilipp Reisner rcu_read_unlock(); 97744ed167dSPhilipp Reisner 9787da35862SPhilipp Reisner msock.socket->sk->sk_sndtimeo = timeout; 979b411b363SPhilipp Reisner 980b411b363SPhilipp Reisner /* we don't want delays. 98125985edcSLucas De Marchi * we use TCP_CORK where appropriate, though */ 9827da35862SPhilipp Reisner drbd_tcp_nodelay(sock.socket); 9837da35862SPhilipp Reisner drbd_tcp_nodelay(msock.socket); 984b411b363SPhilipp Reisner 9857da35862SPhilipp Reisner tconn->data.socket = sock.socket; 9867da35862SPhilipp Reisner tconn->meta.socket = msock.socket; 987907599e0SPhilipp Reisner tconn->last_received = jiffies; 988b411b363SPhilipp Reisner 9896038178eSAndreas Gruenbacher h = drbd_do_features(tconn); 990b411b363SPhilipp Reisner if (h <= 0) 991b411b363SPhilipp Reisner return h; 992b411b363SPhilipp Reisner 993907599e0SPhilipp Reisner if (tconn->cram_hmac_tfm) { 994b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 995907599e0SPhilipp Reisner switch (drbd_do_auth(tconn)) { 996b10d96cbSJohannes Thoma case -1: 997907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed\n"); 998b411b363SPhilipp Reisner return -1; 999b10d96cbSJohannes Thoma case 0: 1000907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed, trying again.\n"); 1001b10d96cbSJohannes Thoma return 0; 1002b411b363SPhilipp Reisner } 1003b411b363SPhilipp Reisner } 1004b411b363SPhilipp Reisner 10057da35862SPhilipp Reisner tconn->data.socket->sk->sk_sndtimeo = timeout; 10067da35862SPhilipp Reisner tconn->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1007b411b363SPhilipp Reisner 1008387eb308SAndreas Gruenbacher if (drbd_send_protocol(tconn) == -EOPNOTSUPP) 10097e2455c1SPhilipp Reisner return -1; 1010b411b363SPhilipp Reisner 1011c141ebdaSPhilipp Reisner rcu_read_lock(); 1012c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 1013c141ebdaSPhilipp Reisner kref_get(&mdev->kref); 1014c141ebdaSPhilipp Reisner rcu_read_unlock(); 101508b165baSPhilipp Reisner 101608b165baSPhilipp Reisner if (discard_my_data) 101708b165baSPhilipp Reisner set_bit(DISCARD_MY_DATA, &mdev->flags); 101808b165baSPhilipp Reisner else 101908b165baSPhilipp Reisner clear_bit(DISCARD_MY_DATA, &mdev->flags); 102008b165baSPhilipp Reisner 1021c141ebdaSPhilipp Reisner drbd_connected(mdev); 1022c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 1023c141ebdaSPhilipp Reisner rcu_read_lock(); 1024c141ebdaSPhilipp Reisner } 1025c141ebdaSPhilipp Reisner rcu_read_unlock(); 1026c141ebdaSPhilipp Reisner 1027823bd832SPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE) < SS_SUCCESS) 1028823bd832SPhilipp Reisner return 0; 1029823bd832SPhilipp Reisner 1030823bd832SPhilipp Reisner drbd_thread_start(&tconn->asender); 1031823bd832SPhilipp Reisner 103208b165baSPhilipp Reisner mutex_lock(&tconn->conf_update); 103308b165baSPhilipp Reisner /* The discard_my_data flag is a single-shot modifier to the next 103408b165baSPhilipp Reisner * connection attempt, the handshake of which is now well underway. 103508b165baSPhilipp Reisner * No need for rcu style copying of the whole struct 103608b165baSPhilipp Reisner * just to clear a single value. */ 103708b165baSPhilipp Reisner tconn->net_conf->discard_my_data = 0; 103808b165baSPhilipp Reisner mutex_unlock(&tconn->conf_update); 103908b165baSPhilipp Reisner 1040d3fcb490SPhilipp Reisner return h; 1041b411b363SPhilipp Reisner 1042b411b363SPhilipp Reisner out_release_sockets: 10437da35862SPhilipp Reisner if (sock.socket) 10447da35862SPhilipp Reisner sock_release(sock.socket); 10457da35862SPhilipp Reisner if (msock.socket) 10467da35862SPhilipp Reisner sock_release(msock.socket); 1047b411b363SPhilipp Reisner return -1; 1048b411b363SPhilipp Reisner } 1049b411b363SPhilipp Reisner 1050e658983aSAndreas Gruenbacher static int decode_header(struct drbd_tconn *tconn, void *header, struct packet_info *pi) 1051b411b363SPhilipp Reisner { 1052e658983aSAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 1053e658983aSAndreas Gruenbacher 10540c8e36d9SAndreas Gruenbacher if (header_size == sizeof(struct p_header100) && 10550c8e36d9SAndreas Gruenbacher *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { 10560c8e36d9SAndreas Gruenbacher struct p_header100 *h = header; 10570c8e36d9SAndreas Gruenbacher if (h->pad != 0) { 10580c8e36d9SAndreas Gruenbacher conn_err(tconn, "Header padding is not zero\n"); 10590c8e36d9SAndreas Gruenbacher return -EINVAL; 10600c8e36d9SAndreas Gruenbacher } 10610c8e36d9SAndreas Gruenbacher pi->vnr = be16_to_cpu(h->volume); 10620c8e36d9SAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 10630c8e36d9SAndreas Gruenbacher pi->size = be32_to_cpu(h->length); 10640c8e36d9SAndreas Gruenbacher } else if (header_size == sizeof(struct p_header95) && 1065e658983aSAndreas Gruenbacher *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { 1066e658983aSAndreas Gruenbacher struct p_header95 *h = header; 1067e658983aSAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 1068b55d84baSAndreas Gruenbacher pi->size = be32_to_cpu(h->length); 1069eefc2f7dSPhilipp Reisner pi->vnr = 0; 1070e658983aSAndreas Gruenbacher } else if (header_size == sizeof(struct p_header80) && 1071e658983aSAndreas Gruenbacher *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { 1072e658983aSAndreas Gruenbacher struct p_header80 *h = header; 1073e658983aSAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 1074e658983aSAndreas Gruenbacher pi->size = be16_to_cpu(h->length); 107577351055SPhilipp Reisner pi->vnr = 0; 107602918be2SPhilipp Reisner } else { 1077e658983aSAndreas Gruenbacher conn_err(tconn, "Wrong magic value 0x%08x in protocol version %d\n", 1078e658983aSAndreas Gruenbacher be32_to_cpu(*(__be32 *)header), 1079e658983aSAndreas Gruenbacher tconn->agreed_pro_version); 10808172f3e9SAndreas Gruenbacher return -EINVAL; 1081b411b363SPhilipp Reisner } 1082e658983aSAndreas Gruenbacher pi->data = header + header_size; 10838172f3e9SAndreas Gruenbacher return 0; 1084257d0af6SPhilipp Reisner } 1085257d0af6SPhilipp Reisner 10869ba7aa00SPhilipp Reisner static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi) 1087257d0af6SPhilipp Reisner { 1088e658983aSAndreas Gruenbacher void *buffer = tconn->data.rbuf; 108969bc7bc3SAndreas Gruenbacher int err; 1090257d0af6SPhilipp Reisner 1091e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, buffer, drbd_header_size(tconn)); 1092a5c31904SAndreas Gruenbacher if (err) 109369bc7bc3SAndreas Gruenbacher return err; 1094257d0af6SPhilipp Reisner 1095e658983aSAndreas Gruenbacher err = decode_header(tconn, buffer, pi); 10969ba7aa00SPhilipp Reisner tconn->last_received = jiffies; 1097b411b363SPhilipp Reisner 109869bc7bc3SAndreas Gruenbacher return err; 1099b411b363SPhilipp Reisner } 1100b411b363SPhilipp Reisner 11014b0007c0SPhilipp Reisner static void drbd_flush(struct drbd_tconn *tconn) 1102b411b363SPhilipp Reisner { 1103b411b363SPhilipp Reisner int rv; 11044b0007c0SPhilipp Reisner struct drbd_conf *mdev; 11054b0007c0SPhilipp Reisner int vnr; 1106b411b363SPhilipp Reisner 11074b0007c0SPhilipp Reisner if (tconn->write_ordering >= WO_bdev_flush) { 1108615e087fSLars Ellenberg rcu_read_lock(); 11094b0007c0SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 1110615e087fSLars Ellenberg if (!get_ldev(mdev)) 1111615e087fSLars Ellenberg continue; 1112615e087fSLars Ellenberg kref_get(&mdev->kref); 1113615e087fSLars Ellenberg rcu_read_unlock(); 11144b0007c0SPhilipp Reisner 1115615e087fSLars Ellenberg rv = blkdev_issue_flush(mdev->ldev->backing_bdev, 1116615e087fSLars Ellenberg GFP_NOIO, NULL); 1117b411b363SPhilipp Reisner if (rv) { 1118a67b813cSPhilipp Reisner dev_info(DEV, "local disk flush failed with status %d\n", rv); 1119b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 1120b411b363SPhilipp Reisner * don't try again for ANY return value != 0 1121b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 11224b0007c0SPhilipp Reisner drbd_bump_write_ordering(tconn, WO_drain_io); 1123615e087fSLars Ellenberg } 1124615e087fSLars Ellenberg put_ldev(mdev); 1125615e087fSLars Ellenberg kref_put(&mdev->kref, &drbd_minor_destroy); 1126615e087fSLars Ellenberg 1127615e087fSLars Ellenberg rcu_read_lock(); 1128615e087fSLars Ellenberg if (rv) 11294b0007c0SPhilipp Reisner break; 1130b411b363SPhilipp Reisner } 1131615e087fSLars Ellenberg rcu_read_unlock(); 1132b411b363SPhilipp Reisner } 1133b411b363SPhilipp Reisner } 1134b411b363SPhilipp Reisner 1135b411b363SPhilipp Reisner /** 1136b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 1137b411b363SPhilipp Reisner * @mdev: DRBD device. 1138b411b363SPhilipp Reisner * @epoch: Epoch object. 1139b411b363SPhilipp Reisner * @ev: Epoch event. 1140b411b363SPhilipp Reisner */ 11411e9dd291SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_tconn *tconn, 1142b411b363SPhilipp Reisner struct drbd_epoch *epoch, 1143b411b363SPhilipp Reisner enum epoch_event ev) 1144b411b363SPhilipp Reisner { 11452451fc3bSPhilipp Reisner int epoch_size; 1146b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 1147b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 1148b411b363SPhilipp Reisner 114912038a3aSPhilipp Reisner spin_lock(&tconn->epoch_lock); 1150b411b363SPhilipp Reisner do { 1151b411b363SPhilipp Reisner next_epoch = NULL; 1152b411b363SPhilipp Reisner 1153b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 1154b411b363SPhilipp Reisner 1155b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 1156b411b363SPhilipp Reisner case EV_PUT: 1157b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1158b411b363SPhilipp Reisner break; 1159b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1160b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1161b411b363SPhilipp Reisner break; 1162b411b363SPhilipp Reisner case EV_BECAME_LAST: 1163b411b363SPhilipp Reisner /* nothing to do*/ 1164b411b363SPhilipp Reisner break; 1165b411b363SPhilipp Reisner } 1166b411b363SPhilipp Reisner 1167b411b363SPhilipp Reisner if (epoch_size != 0 && 1168b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 116985d73513SPhilipp Reisner (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { 1170b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 117112038a3aSPhilipp Reisner spin_unlock(&tconn->epoch_lock); 11721d2783d5SPhilipp Reisner drbd_send_b_ack(epoch->mdev, epoch->barrier_nr, epoch_size); 117312038a3aSPhilipp Reisner spin_lock(&tconn->epoch_lock); 1174b411b363SPhilipp Reisner } 117585d73513SPhilipp Reisner if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) 11761d2783d5SPhilipp Reisner dec_unacked(epoch->mdev); 1177b411b363SPhilipp Reisner 117812038a3aSPhilipp Reisner if (tconn->current_epoch != epoch) { 1179b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1180b411b363SPhilipp Reisner list_del(&epoch->list); 1181b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 118212038a3aSPhilipp Reisner tconn->epochs--; 1183b411b363SPhilipp Reisner kfree(epoch); 1184b411b363SPhilipp Reisner 1185b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1186b411b363SPhilipp Reisner rv = FE_DESTROYED; 1187b411b363SPhilipp Reisner } else { 1188b411b363SPhilipp Reisner epoch->flags = 0; 1189b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1190698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1191b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1192b411b363SPhilipp Reisner rv = FE_RECYCLED; 1193b411b363SPhilipp Reisner } 1194b411b363SPhilipp Reisner } 1195b411b363SPhilipp Reisner 1196b411b363SPhilipp Reisner if (!next_epoch) 1197b411b363SPhilipp Reisner break; 1198b411b363SPhilipp Reisner 1199b411b363SPhilipp Reisner epoch = next_epoch; 1200b411b363SPhilipp Reisner } while (1); 1201b411b363SPhilipp Reisner 120212038a3aSPhilipp Reisner spin_unlock(&tconn->epoch_lock); 1203b411b363SPhilipp Reisner 1204b411b363SPhilipp Reisner return rv; 1205b411b363SPhilipp Reisner } 1206b411b363SPhilipp Reisner 1207b411b363SPhilipp Reisner /** 1208b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 12094b0007c0SPhilipp Reisner * @tconn: DRBD connection. 1210b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1211b411b363SPhilipp Reisner */ 12124b0007c0SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_tconn *tconn, enum write_ordering_e wo) 1213b411b363SPhilipp Reisner { 1214daeda1ccSPhilipp Reisner struct disk_conf *dc; 12154b0007c0SPhilipp Reisner struct drbd_conf *mdev; 1216b411b363SPhilipp Reisner enum write_ordering_e pwo; 12174b0007c0SPhilipp Reisner int vnr; 1218b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1219b411b363SPhilipp Reisner [WO_none] = "none", 1220b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1221b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1222b411b363SPhilipp Reisner }; 1223b411b363SPhilipp Reisner 12244b0007c0SPhilipp Reisner pwo = tconn->write_ordering; 1225b411b363SPhilipp Reisner wo = min(pwo, wo); 1226daeda1ccSPhilipp Reisner rcu_read_lock(); 12274b0007c0SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 12284b0007c0SPhilipp Reisner if (!get_ldev(mdev)) 12294b0007c0SPhilipp Reisner continue; 1230daeda1ccSPhilipp Reisner dc = rcu_dereference(mdev->ldev->disk_conf); 1231daeda1ccSPhilipp Reisner 123266b2f6b9SAndreas Gruenbacher if (wo == WO_bdev_flush && !dc->disk_flushes) 1233b411b363SPhilipp Reisner wo = WO_drain_io; 1234d0c980e2SAndreas Gruenbacher if (wo == WO_drain_io && !dc->disk_drain) 1235b411b363SPhilipp Reisner wo = WO_none; 12364b0007c0SPhilipp Reisner put_ldev(mdev); 12374b0007c0SPhilipp Reisner } 1238daeda1ccSPhilipp Reisner rcu_read_unlock(); 12394b0007c0SPhilipp Reisner tconn->write_ordering = wo; 12404b0007c0SPhilipp Reisner if (pwo != tconn->write_ordering || wo == WO_bdev_flush) 12414b0007c0SPhilipp Reisner conn_info(tconn, "Method to ensure write ordering: %s\n", write_ordering_str[tconn->write_ordering]); 1242b411b363SPhilipp Reisner } 1243b411b363SPhilipp Reisner 1244b411b363SPhilipp Reisner /** 1245fbe29decSAndreas Gruenbacher * drbd_submit_peer_request() 124645bb912bSLars Ellenberg * @mdev: DRBD device. 1247db830c46SAndreas Gruenbacher * @peer_req: peer request 124845bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 124910f6d992SLars Ellenberg * 125010f6d992SLars Ellenberg * May spread the pages to multiple bios, 125110f6d992SLars Ellenberg * depending on bio_add_page restrictions. 125210f6d992SLars Ellenberg * 125310f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 125410f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 125510f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 125610f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 125710f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 125810f6d992SLars Ellenberg * on certain Xen deployments. 125945bb912bSLars Ellenberg */ 126045bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 1261fbe29decSAndreas Gruenbacher int drbd_submit_peer_request(struct drbd_conf *mdev, 1262fbe29decSAndreas Gruenbacher struct drbd_peer_request *peer_req, 126345bb912bSLars Ellenberg const unsigned rw, const int fault_type) 126445bb912bSLars Ellenberg { 126545bb912bSLars Ellenberg struct bio *bios = NULL; 126645bb912bSLars Ellenberg struct bio *bio; 1267db830c46SAndreas Gruenbacher struct page *page = peer_req->pages; 1268db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1269db830c46SAndreas Gruenbacher unsigned ds = peer_req->i.size; 127045bb912bSLars Ellenberg unsigned n_bios = 0; 127145bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 127210f6d992SLars Ellenberg int err = -ENOMEM; 127345bb912bSLars Ellenberg 127445bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 127545bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 127645bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 1277da4a75d2SLars Ellenberg * request in more than one bio. 1278da4a75d2SLars Ellenberg * 1279da4a75d2SLars Ellenberg * Plain bio_alloc is good enough here, this is no DRBD internally 1280da4a75d2SLars Ellenberg * generated bio, but a bio allocated on behalf of the peer. 1281da4a75d2SLars Ellenberg */ 128245bb912bSLars Ellenberg next_bio: 128345bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 128445bb912bSLars Ellenberg if (!bio) { 128545bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 128645bb912bSLars Ellenberg goto fail; 128745bb912bSLars Ellenberg } 1288db830c46SAndreas Gruenbacher /* > peer_req->i.sector, unless this is the first bio */ 128945bb912bSLars Ellenberg bio->bi_sector = sector; 129045bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 129145bb912bSLars Ellenberg bio->bi_rw = rw; 1292db830c46SAndreas Gruenbacher bio->bi_private = peer_req; 1293fcefa62eSAndreas Gruenbacher bio->bi_end_io = drbd_peer_request_endio; 129445bb912bSLars Ellenberg 129545bb912bSLars Ellenberg bio->bi_next = bios; 129645bb912bSLars Ellenberg bios = bio; 129745bb912bSLars Ellenberg ++n_bios; 129845bb912bSLars Ellenberg 129945bb912bSLars Ellenberg page_chain_for_each(page) { 130045bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 130145bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 130210f6d992SLars Ellenberg /* A single page must always be possible! 130310f6d992SLars Ellenberg * But in case it fails anyways, 130410f6d992SLars Ellenberg * we deal with it, and complain (below). */ 130510f6d992SLars Ellenberg if (bio->bi_vcnt == 0) { 130610f6d992SLars Ellenberg dev_err(DEV, 130710f6d992SLars Ellenberg "bio_add_page failed for len=%u, " 130810f6d992SLars Ellenberg "bi_vcnt=0 (bi_sector=%llu)\n", 130910f6d992SLars Ellenberg len, (unsigned long long)bio->bi_sector); 131010f6d992SLars Ellenberg err = -ENOSPC; 131110f6d992SLars Ellenberg goto fail; 131210f6d992SLars Ellenberg } 131345bb912bSLars Ellenberg goto next_bio; 131445bb912bSLars Ellenberg } 131545bb912bSLars Ellenberg ds -= len; 131645bb912bSLars Ellenberg sector += len >> 9; 131745bb912bSLars Ellenberg --nr_pages; 131845bb912bSLars Ellenberg } 131945bb912bSLars Ellenberg D_ASSERT(page == NULL); 132045bb912bSLars Ellenberg D_ASSERT(ds == 0); 132145bb912bSLars Ellenberg 1322db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, n_bios); 132345bb912bSLars Ellenberg do { 132445bb912bSLars Ellenberg bio = bios; 132545bb912bSLars Ellenberg bios = bios->bi_next; 132645bb912bSLars Ellenberg bio->bi_next = NULL; 132745bb912bSLars Ellenberg 132845bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 132945bb912bSLars Ellenberg } while (bios); 133045bb912bSLars Ellenberg return 0; 133145bb912bSLars Ellenberg 133245bb912bSLars Ellenberg fail: 133345bb912bSLars Ellenberg while (bios) { 133445bb912bSLars Ellenberg bio = bios; 133545bb912bSLars Ellenberg bios = bios->bi_next; 133645bb912bSLars Ellenberg bio_put(bio); 133745bb912bSLars Ellenberg } 133810f6d992SLars Ellenberg return err; 133945bb912bSLars Ellenberg } 134045bb912bSLars Ellenberg 134153840641SAndreas Gruenbacher static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, 1342db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req) 134353840641SAndreas Gruenbacher { 1344db830c46SAndreas Gruenbacher struct drbd_interval *i = &peer_req->i; 134553840641SAndreas Gruenbacher 134653840641SAndreas Gruenbacher drbd_remove_interval(&mdev->write_requests, i); 134753840641SAndreas Gruenbacher drbd_clear_interval(i); 134853840641SAndreas Gruenbacher 13496c852becSAndreas Gruenbacher /* Wake up any processes waiting for this peer request to complete. */ 135053840641SAndreas Gruenbacher if (i->waiting) 135153840641SAndreas Gruenbacher wake_up(&mdev->misc_wait); 135253840641SAndreas Gruenbacher } 135353840641SAndreas Gruenbacher 135477fede51SPhilipp Reisner void conn_wait_active_ee_empty(struct drbd_tconn *tconn) 135577fede51SPhilipp Reisner { 135677fede51SPhilipp Reisner struct drbd_conf *mdev; 135777fede51SPhilipp Reisner int vnr; 135877fede51SPhilipp Reisner 135977fede51SPhilipp Reisner rcu_read_lock(); 136077fede51SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 136177fede51SPhilipp Reisner kref_get(&mdev->kref); 136277fede51SPhilipp Reisner rcu_read_unlock(); 136377fede51SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 136477fede51SPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 136577fede51SPhilipp Reisner rcu_read_lock(); 136677fede51SPhilipp Reisner } 136777fede51SPhilipp Reisner rcu_read_unlock(); 136877fede51SPhilipp Reisner } 136977fede51SPhilipp Reisner 13704a76b161SAndreas Gruenbacher static int receive_Barrier(struct drbd_tconn *tconn, struct packet_info *pi) 1371b411b363SPhilipp Reisner { 13724a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 13732451fc3bSPhilipp Reisner int rv; 1374e658983aSAndreas Gruenbacher struct p_barrier *p = pi->data; 1375b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1376b411b363SPhilipp Reisner 13774a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 13784a76b161SAndreas Gruenbacher if (!mdev) 13794a76b161SAndreas Gruenbacher return -EIO; 13804a76b161SAndreas Gruenbacher 1381b411b363SPhilipp Reisner inc_unacked(mdev); 1382b411b363SPhilipp Reisner 138312038a3aSPhilipp Reisner tconn->current_epoch->barrier_nr = p->barrier; 138412038a3aSPhilipp Reisner tconn->current_epoch->mdev = mdev; 13851e9dd291SPhilipp Reisner rv = drbd_may_finish_epoch(tconn, tconn->current_epoch, EV_GOT_BARRIER_NR); 1386b411b363SPhilipp Reisner 1387b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1388b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1389b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1390b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1391b411b363SPhilipp Reisner * completed. */ 13924b0007c0SPhilipp Reisner switch (tconn->write_ordering) { 1393b411b363SPhilipp Reisner case WO_none: 1394b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 139582bc0194SAndreas Gruenbacher return 0; 1396b411b363SPhilipp Reisner 1397b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1398b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1399b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 14002451fc3bSPhilipp Reisner if (epoch) 14012451fc3bSPhilipp Reisner break; 14022451fc3bSPhilipp Reisner else 1403b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 14042451fc3bSPhilipp Reisner /* Fall through */ 14052451fc3bSPhilipp Reisner 14062451fc3bSPhilipp Reisner case WO_bdev_flush: 14072451fc3bSPhilipp Reisner case WO_drain_io: 140877fede51SPhilipp Reisner conn_wait_active_ee_empty(tconn); 14094b0007c0SPhilipp Reisner drbd_flush(tconn); 14102451fc3bSPhilipp Reisner 141112038a3aSPhilipp Reisner if (atomic_read(&tconn->current_epoch->epoch_size)) { 14122451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 14132451fc3bSPhilipp Reisner if (epoch) 14142451fc3bSPhilipp Reisner break; 1415b411b363SPhilipp Reisner } 1416b411b363SPhilipp Reisner 141712038a3aSPhilipp Reisner epoch = tconn->current_epoch; 14182451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 14192451fc3bSPhilipp Reisner 14202451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 14212451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1422b411b363SPhilipp Reisner 142382bc0194SAndreas Gruenbacher return 0; 14242451fc3bSPhilipp Reisner default: 14254b0007c0SPhilipp Reisner dev_err(DEV, "Strangeness in tconn->write_ordering %d\n", tconn->write_ordering); 142682bc0194SAndreas Gruenbacher return -EIO; 1427b411b363SPhilipp Reisner } 1428b411b363SPhilipp Reisner 1429b411b363SPhilipp Reisner epoch->flags = 0; 1430b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1431b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1432b411b363SPhilipp Reisner 143312038a3aSPhilipp Reisner spin_lock(&tconn->epoch_lock); 143412038a3aSPhilipp Reisner if (atomic_read(&tconn->current_epoch->epoch_size)) { 143512038a3aSPhilipp Reisner list_add(&epoch->list, &tconn->current_epoch->list); 143612038a3aSPhilipp Reisner tconn->current_epoch = epoch; 143712038a3aSPhilipp Reisner tconn->epochs++; 1438b411b363SPhilipp Reisner } else { 1439b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1440b411b363SPhilipp Reisner kfree(epoch); 1441b411b363SPhilipp Reisner } 144212038a3aSPhilipp Reisner spin_unlock(&tconn->epoch_lock); 1443b411b363SPhilipp Reisner 144482bc0194SAndreas Gruenbacher return 0; 1445b411b363SPhilipp Reisner } 1446b411b363SPhilipp Reisner 1447b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1448b411b363SPhilipp Reisner * and from receive_Data */ 1449f6ffca9fSAndreas Gruenbacher static struct drbd_peer_request * 1450f6ffca9fSAndreas Gruenbacher read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, 1451f6ffca9fSAndreas Gruenbacher int data_size) __must_hold(local) 1452b411b363SPhilipp Reisner { 14536666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1454db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1455b411b363SPhilipp Reisner struct page *page; 1456a5c31904SAndreas Gruenbacher int dgs, ds, err; 1457a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1458a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 14596b4388acSPhilipp Reisner unsigned long *data; 1460b411b363SPhilipp Reisner 146188104ca4SAndreas Gruenbacher dgs = 0; 146288104ca4SAndreas Gruenbacher if (mdev->tconn->peer_integrity_tfm) { 146388104ca4SAndreas Gruenbacher dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); 14649f5bdc33SAndreas Gruenbacher /* 14659f5bdc33SAndreas Gruenbacher * FIXME: Receive the incoming digest into the receive buffer 14669f5bdc33SAndreas Gruenbacher * here, together with its struct p_data? 14679f5bdc33SAndreas Gruenbacher */ 1468a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1469a5c31904SAndreas Gruenbacher if (err) 1470b411b363SPhilipp Reisner return NULL; 1471b411b363SPhilipp Reisner data_size -= dgs; 147288104ca4SAndreas Gruenbacher } 1473b411b363SPhilipp Reisner 1474841ce241SAndreas Gruenbacher if (!expect(data_size != 0)) 1475841ce241SAndreas Gruenbacher return NULL; 1476841ce241SAndreas Gruenbacher if (!expect(IS_ALIGNED(data_size, 512))) 1477841ce241SAndreas Gruenbacher return NULL; 1478841ce241SAndreas Gruenbacher if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) 1479841ce241SAndreas Gruenbacher return NULL; 1480b411b363SPhilipp Reisner 14816666032aSLars Ellenberg /* even though we trust out peer, 14826666032aSLars Ellenberg * we sometimes have to double check. */ 14836666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1484fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1485fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 14866666032aSLars Ellenberg (unsigned long long)capacity, 14876666032aSLars Ellenberg (unsigned long long)sector, data_size); 14886666032aSLars Ellenberg return NULL; 14896666032aSLars Ellenberg } 14906666032aSLars Ellenberg 1491b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1492b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1493b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 14940db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, id, sector, data_size, GFP_NOIO); 1495db830c46SAndreas Gruenbacher if (!peer_req) 1496b411b363SPhilipp Reisner return NULL; 149745bb912bSLars Ellenberg 1498b411b363SPhilipp Reisner ds = data_size; 1499db830c46SAndreas Gruenbacher page = peer_req->pages; 150045bb912bSLars Ellenberg page_chain_for_each(page) { 150145bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 15026b4388acSPhilipp Reisner data = kmap(page); 1503a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 15040cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 15056b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 15066b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 15076b4388acSPhilipp Reisner } 1508b411b363SPhilipp Reisner kunmap(page); 1509a5c31904SAndreas Gruenbacher if (err) { 15103967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1511b411b363SPhilipp Reisner return NULL; 1512b411b363SPhilipp Reisner } 1513a5c31904SAndreas Gruenbacher ds -= len; 1514b411b363SPhilipp Reisner } 1515b411b363SPhilipp Reisner 1516b411b363SPhilipp Reisner if (dgs) { 15175b614abeSAndreas Gruenbacher drbd_csum_ee(mdev, mdev->tconn->peer_integrity_tfm, peer_req, dig_vv); 1518b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1519470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1520470be44aSLars Ellenberg (unsigned long long)sector, data_size); 15213967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1522b411b363SPhilipp Reisner return NULL; 1523b411b363SPhilipp Reisner } 1524b411b363SPhilipp Reisner } 1525b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1526db830c46SAndreas Gruenbacher return peer_req; 1527b411b363SPhilipp Reisner } 1528b411b363SPhilipp Reisner 1529b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1530b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1531b411b363SPhilipp Reisner */ 1532b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1533b411b363SPhilipp Reisner { 1534b411b363SPhilipp Reisner struct page *page; 1535a5c31904SAndreas Gruenbacher int err = 0; 1536b411b363SPhilipp Reisner void *data; 1537b411b363SPhilipp Reisner 1538c3470cdeSLars Ellenberg if (!data_size) 1539fc5be839SAndreas Gruenbacher return 0; 1540c3470cdeSLars Ellenberg 1541c37c8ecfSAndreas Gruenbacher page = drbd_alloc_pages(mdev, 1, 1); 1542b411b363SPhilipp Reisner 1543b411b363SPhilipp Reisner data = kmap(page); 1544b411b363SPhilipp Reisner while (data_size) { 1545fc5be839SAndreas Gruenbacher unsigned int len = min_t(int, data_size, PAGE_SIZE); 1546fc5be839SAndreas Gruenbacher 1547a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 1548a5c31904SAndreas Gruenbacher if (err) 1549b411b363SPhilipp Reisner break; 1550a5c31904SAndreas Gruenbacher data_size -= len; 1551b411b363SPhilipp Reisner } 1552b411b363SPhilipp Reisner kunmap(page); 15535cc287e0SAndreas Gruenbacher drbd_free_pages(mdev, page, 0); 1554fc5be839SAndreas Gruenbacher return err; 1555b411b363SPhilipp Reisner } 1556b411b363SPhilipp Reisner 1557b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1558b411b363SPhilipp Reisner sector_t sector, int data_size) 1559b411b363SPhilipp Reisner { 1560b411b363SPhilipp Reisner struct bio_vec *bvec; 1561b411b363SPhilipp Reisner struct bio *bio; 1562a5c31904SAndreas Gruenbacher int dgs, err, i, expect; 1563a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1564a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 1565b411b363SPhilipp Reisner 156688104ca4SAndreas Gruenbacher dgs = 0; 156788104ca4SAndreas Gruenbacher if (mdev->tconn->peer_integrity_tfm) { 156888104ca4SAndreas Gruenbacher dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); 1569a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1570a5c31904SAndreas Gruenbacher if (err) 1571a5c31904SAndreas Gruenbacher return err; 1572b411b363SPhilipp Reisner data_size -= dgs; 157388104ca4SAndreas Gruenbacher } 1574b411b363SPhilipp Reisner 1575b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1576b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1577b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1578b411b363SPhilipp Reisner 1579b411b363SPhilipp Reisner bio = req->master_bio; 1580b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1581b411b363SPhilipp Reisner 1582b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1583a5c31904SAndreas Gruenbacher void *mapped = kmap(bvec->bv_page) + bvec->bv_offset; 1584b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1585a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, mapped, expect); 1586b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1587a5c31904SAndreas Gruenbacher if (err) 1588a5c31904SAndreas Gruenbacher return err; 1589a5c31904SAndreas Gruenbacher data_size -= expect; 1590b411b363SPhilipp Reisner } 1591b411b363SPhilipp Reisner 1592b411b363SPhilipp Reisner if (dgs) { 15935b614abeSAndreas Gruenbacher drbd_csum_bio(mdev, mdev->tconn->peer_integrity_tfm, bio, dig_vv); 1594b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1595b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 159628284cefSAndreas Gruenbacher return -EINVAL; 1597b411b363SPhilipp Reisner } 1598b411b363SPhilipp Reisner } 1599b411b363SPhilipp Reisner 1600b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 160128284cefSAndreas Gruenbacher return 0; 1602b411b363SPhilipp Reisner } 1603b411b363SPhilipp Reisner 1604a990be46SAndreas Gruenbacher /* 1605a990be46SAndreas Gruenbacher * e_end_resync_block() is called in asender context via 1606a990be46SAndreas Gruenbacher * drbd_finish_peer_reqs(). 1607a990be46SAndreas Gruenbacher */ 160899920dc5SAndreas Gruenbacher static int e_end_resync_block(struct drbd_work *w, int unused) 1609b411b363SPhilipp Reisner { 16108050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 16118050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 161200d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1613db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 161499920dc5SAndreas Gruenbacher int err; 1615b411b363SPhilipp Reisner 1616db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1617b411b363SPhilipp Reisner 1618db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1619db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 162099920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); 1621b411b363SPhilipp Reisner } else { 1622b411b363SPhilipp Reisner /* Record failure to sync */ 1623db830c46SAndreas Gruenbacher drbd_rs_failed_io(mdev, sector, peer_req->i.size); 1624b411b363SPhilipp Reisner 162599920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1626b411b363SPhilipp Reisner } 1627b411b363SPhilipp Reisner dec_unacked(mdev); 1628b411b363SPhilipp Reisner 162999920dc5SAndreas Gruenbacher return err; 1630b411b363SPhilipp Reisner } 1631b411b363SPhilipp Reisner 1632b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1633b411b363SPhilipp Reisner { 1634db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1635b411b363SPhilipp Reisner 1636db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); 1637db830c46SAndreas Gruenbacher if (!peer_req) 163845bb912bSLars Ellenberg goto fail; 1639b411b363SPhilipp Reisner 1640b411b363SPhilipp Reisner dec_rs_pending(mdev); 1641b411b363SPhilipp Reisner 1642b411b363SPhilipp Reisner inc_unacked(mdev); 1643b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1644b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1645b411b363SPhilipp Reisner 1646db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_resync_block; 164745bb912bSLars Ellenberg 164887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1649db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->sync_ee); 165087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1651b411b363SPhilipp Reisner 16520f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 1653fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) 1654e1c1b0fcSAndreas Gruenbacher return 0; 165545bb912bSLars Ellenberg 165610f6d992SLars Ellenberg /* don't care for the reason here */ 165710f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 165887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1659db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 166087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 166122cc37a9SLars Ellenberg 16623967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 166345bb912bSLars Ellenberg fail: 166445bb912bSLars Ellenberg put_ldev(mdev); 1665e1c1b0fcSAndreas Gruenbacher return -EIO; 1666b411b363SPhilipp Reisner } 1667b411b363SPhilipp Reisner 1668668eebc6SAndreas Gruenbacher static struct drbd_request * 1669bc9c5c41SAndreas Gruenbacher find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, 1670bc9c5c41SAndreas Gruenbacher sector_t sector, bool missing_ok, const char *func) 1671668eebc6SAndreas Gruenbacher { 1672668eebc6SAndreas Gruenbacher struct drbd_request *req; 1673668eebc6SAndreas Gruenbacher 1674bc9c5c41SAndreas Gruenbacher /* Request object according to our peer */ 1675bc9c5c41SAndreas Gruenbacher req = (struct drbd_request *)(unsigned long)id; 16765e472264SAndreas Gruenbacher if (drbd_contains_interval(root, sector, &req->i) && req->i.local) 1677668eebc6SAndreas Gruenbacher return req; 1678c3afd8f5SAndreas Gruenbacher if (!missing_ok) { 16795af172edSAndreas Gruenbacher dev_err(DEV, "%s: failed to find request 0x%lx, sector %llus\n", func, 1680c3afd8f5SAndreas Gruenbacher (unsigned long)id, (unsigned long long)sector); 1681c3afd8f5SAndreas Gruenbacher } 1682668eebc6SAndreas Gruenbacher return NULL; 1683668eebc6SAndreas Gruenbacher } 1684668eebc6SAndreas Gruenbacher 16854a76b161SAndreas Gruenbacher static int receive_DataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1686b411b363SPhilipp Reisner { 16874a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1688b411b363SPhilipp Reisner struct drbd_request *req; 1689b411b363SPhilipp Reisner sector_t sector; 169082bc0194SAndreas Gruenbacher int err; 1691e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 16924a76b161SAndreas Gruenbacher 16934a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 16944a76b161SAndreas Gruenbacher if (!mdev) 16954a76b161SAndreas Gruenbacher return -EIO; 1696b411b363SPhilipp Reisner 1697b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1698b411b363SPhilipp Reisner 169987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1700bc9c5c41SAndreas Gruenbacher req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); 170187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1702c3afd8f5SAndreas Gruenbacher if (unlikely(!req)) 170382bc0194SAndreas Gruenbacher return -EIO; 1704b411b363SPhilipp Reisner 170524c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1706b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1707b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1708e2857216SAndreas Gruenbacher err = recv_dless_read(mdev, req, sector, pi->size); 170982bc0194SAndreas Gruenbacher if (!err) 17108554df1cSAndreas Gruenbacher req_mod(req, DATA_RECEIVED); 1711b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1712b411b363SPhilipp Reisner * I don't think we may complete this just yet 1713b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1714b411b363SPhilipp Reisner 171582bc0194SAndreas Gruenbacher return err; 1716b411b363SPhilipp Reisner } 1717b411b363SPhilipp Reisner 17184a76b161SAndreas Gruenbacher static int receive_RSDataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1719b411b363SPhilipp Reisner { 17204a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1721b411b363SPhilipp Reisner sector_t sector; 172282bc0194SAndreas Gruenbacher int err; 1723e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 17244a76b161SAndreas Gruenbacher 17254a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 17264a76b161SAndreas Gruenbacher if (!mdev) 17274a76b161SAndreas Gruenbacher return -EIO; 1728b411b363SPhilipp Reisner 1729b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1730b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1731b411b363SPhilipp Reisner 1732b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1733b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1734b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1735fcefa62eSAndreas Gruenbacher * or in drbd_peer_request_endio. */ 1736e2857216SAndreas Gruenbacher err = recv_resync_read(mdev, sector, pi->size); 1737b411b363SPhilipp Reisner } else { 1738b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1739b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1740b411b363SPhilipp Reisner 1741e2857216SAndreas Gruenbacher err = drbd_drain_block(mdev, pi->size); 1742b411b363SPhilipp Reisner 1743e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 1744b411b363SPhilipp Reisner } 1745b411b363SPhilipp Reisner 1746e2857216SAndreas Gruenbacher atomic_add(pi->size >> 9, &mdev->rs_sect_in); 1747778f271dSPhilipp Reisner 174882bc0194SAndreas Gruenbacher return err; 1749b411b363SPhilipp Reisner } 1750b411b363SPhilipp Reisner 175199920dc5SAndreas Gruenbacher static int w_restart_write(struct drbd_work *w, int cancel) 17527be8da07SAndreas Gruenbacher { 17537be8da07SAndreas Gruenbacher struct drbd_request *req = container_of(w, struct drbd_request, w); 17547be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 17557be8da07SAndreas Gruenbacher struct bio *bio; 17567be8da07SAndreas Gruenbacher unsigned long start_time; 17577be8da07SAndreas Gruenbacher unsigned long flags; 17587be8da07SAndreas Gruenbacher 17597be8da07SAndreas Gruenbacher spin_lock_irqsave(&mdev->tconn->req_lock, flags); 17607be8da07SAndreas Gruenbacher if (!expect(req->rq_state & RQ_POSTPONED)) { 17617be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 176299920dc5SAndreas Gruenbacher return -EIO; 17637be8da07SAndreas Gruenbacher } 17647be8da07SAndreas Gruenbacher bio = req->master_bio; 17657be8da07SAndreas Gruenbacher start_time = req->start_time; 17667be8da07SAndreas Gruenbacher /* Postponed requests will not have their master_bio completed! */ 17677be8da07SAndreas Gruenbacher __req_mod(req, DISCARD_WRITE, NULL); 17687be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 17697be8da07SAndreas Gruenbacher 17707be8da07SAndreas Gruenbacher while (__drbd_make_request(mdev, bio, start_time)) 17717be8da07SAndreas Gruenbacher /* retry */ ; 177299920dc5SAndreas Gruenbacher return 0; 17737be8da07SAndreas Gruenbacher } 17747be8da07SAndreas Gruenbacher 17757be8da07SAndreas Gruenbacher static void restart_conflicting_writes(struct drbd_conf *mdev, 17767be8da07SAndreas Gruenbacher sector_t sector, int size) 17777be8da07SAndreas Gruenbacher { 17787be8da07SAndreas Gruenbacher struct drbd_interval *i; 17797be8da07SAndreas Gruenbacher struct drbd_request *req; 17807be8da07SAndreas Gruenbacher 17817be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 17827be8da07SAndreas Gruenbacher if (!i->local) 17837be8da07SAndreas Gruenbacher continue; 17847be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 17857be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 17867be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) 17877be8da07SAndreas Gruenbacher continue; 17887be8da07SAndreas Gruenbacher if (expect(list_empty(&req->w.list))) { 17897be8da07SAndreas Gruenbacher req->w.mdev = mdev; 17907be8da07SAndreas Gruenbacher req->w.cb = w_restart_write; 17917be8da07SAndreas Gruenbacher drbd_queue_work(&mdev->tconn->data.work, &req->w); 17927be8da07SAndreas Gruenbacher } 17937be8da07SAndreas Gruenbacher } 17947be8da07SAndreas Gruenbacher } 17957be8da07SAndreas Gruenbacher 1796a990be46SAndreas Gruenbacher /* 1797a990be46SAndreas Gruenbacher * e_end_block() is called in asender context via drbd_finish_peer_reqs(). 1798b411b363SPhilipp Reisner */ 179999920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *w, int cancel) 1800b411b363SPhilipp Reisner { 18018050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 18028050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 180300d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1804db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 180599920dc5SAndreas Gruenbacher int err = 0, pcmd; 1806b411b363SPhilipp Reisner 1807303d1448SPhilipp Reisner if (peer_req->flags & EE_SEND_WRITE_ACK) { 1808db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1809b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1810b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1811db830c46SAndreas Gruenbacher peer_req->flags & EE_MAY_SET_IN_SYNC) ? 1812b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 181399920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, pcmd, peer_req); 1814b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1815db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 1816b411b363SPhilipp Reisner } else { 181799920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1818b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1819b411b363SPhilipp Reisner * maybe assert this? */ 1820b411b363SPhilipp Reisner } 1821b411b363SPhilipp Reisner dec_unacked(mdev); 1822b411b363SPhilipp Reisner } 1823b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1824b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 1825302bdeaeSPhilipp Reisner if (peer_req->flags & EE_IN_INTERVAL_TREE) { 182687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1827db830c46SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&peer_req->i)); 1828db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 18297be8da07SAndreas Gruenbacher if (peer_req->flags & EE_RESTART_REQUESTS) 18307be8da07SAndreas Gruenbacher restart_conflicting_writes(mdev, sector, peer_req->i.size); 183187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1832bb3bfe96SAndreas Gruenbacher } else 1833db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1834b411b363SPhilipp Reisner 18351e9dd291SPhilipp Reisner drbd_may_finish_epoch(mdev->tconn, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1836b411b363SPhilipp Reisner 183799920dc5SAndreas Gruenbacher return err; 1838b411b363SPhilipp Reisner } 1839b411b363SPhilipp Reisner 18407be8da07SAndreas Gruenbacher static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) 1841b411b363SPhilipp Reisner { 18427be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 18438050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 18448050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 184599920dc5SAndreas Gruenbacher int err; 1846b411b363SPhilipp Reisner 184799920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, ack, peer_req); 1848b411b363SPhilipp Reisner dec_unacked(mdev); 1849b411b363SPhilipp Reisner 185099920dc5SAndreas Gruenbacher return err; 1851b411b363SPhilipp Reisner } 1852b411b363SPhilipp Reisner 185399920dc5SAndreas Gruenbacher static int e_send_discard_write(struct drbd_work *w, int unused) 18547be8da07SAndreas Gruenbacher { 18557be8da07SAndreas Gruenbacher return e_send_ack(w, P_DISCARD_WRITE); 18567be8da07SAndreas Gruenbacher } 18577be8da07SAndreas Gruenbacher 185899920dc5SAndreas Gruenbacher static int e_send_retry_write(struct drbd_work *w, int unused) 18597be8da07SAndreas Gruenbacher { 18607be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = w->mdev->tconn; 18617be8da07SAndreas Gruenbacher 18627be8da07SAndreas Gruenbacher return e_send_ack(w, tconn->agreed_pro_version >= 100 ? 18637be8da07SAndreas Gruenbacher P_RETRY_WRITE : P_DISCARD_WRITE); 18647be8da07SAndreas Gruenbacher } 18657be8da07SAndreas Gruenbacher 18663e394da1SAndreas Gruenbacher static bool seq_greater(u32 a, u32 b) 18673e394da1SAndreas Gruenbacher { 18683e394da1SAndreas Gruenbacher /* 18693e394da1SAndreas Gruenbacher * We assume 32-bit wrap-around here. 18703e394da1SAndreas Gruenbacher * For 24-bit wrap-around, we would have to shift: 18713e394da1SAndreas Gruenbacher * a <<= 8; b <<= 8; 18723e394da1SAndreas Gruenbacher */ 18733e394da1SAndreas Gruenbacher return (s32)a - (s32)b > 0; 18743e394da1SAndreas Gruenbacher } 18753e394da1SAndreas Gruenbacher 18763e394da1SAndreas Gruenbacher static u32 seq_max(u32 a, u32 b) 18773e394da1SAndreas Gruenbacher { 18783e394da1SAndreas Gruenbacher return seq_greater(a, b) ? a : b; 18793e394da1SAndreas Gruenbacher } 18803e394da1SAndreas Gruenbacher 18817be8da07SAndreas Gruenbacher static bool need_peer_seq(struct drbd_conf *mdev) 18827be8da07SAndreas Gruenbacher { 18837be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 1884302bdeaeSPhilipp Reisner int tp; 18857be8da07SAndreas Gruenbacher 18867be8da07SAndreas Gruenbacher /* 18877be8da07SAndreas Gruenbacher * We only need to keep track of the last packet_seq number of our peer 18887be8da07SAndreas Gruenbacher * if we are in dual-primary mode and we have the discard flag set; see 18897be8da07SAndreas Gruenbacher * handle_write_conflicts(). 18907be8da07SAndreas Gruenbacher */ 1891302bdeaeSPhilipp Reisner 1892302bdeaeSPhilipp Reisner rcu_read_lock(); 1893302bdeaeSPhilipp Reisner tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; 1894302bdeaeSPhilipp Reisner rcu_read_unlock(); 1895302bdeaeSPhilipp Reisner 1896302bdeaeSPhilipp Reisner return tp && test_bit(DISCARD_CONCURRENT, &tconn->flags); 18977be8da07SAndreas Gruenbacher } 18987be8da07SAndreas Gruenbacher 189943ae077dSAndreas Gruenbacher static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) 19003e394da1SAndreas Gruenbacher { 19013c13b680SLars Ellenberg unsigned int newest_peer_seq; 19023e394da1SAndreas Gruenbacher 19037be8da07SAndreas Gruenbacher if (need_peer_seq(mdev)) { 19043e394da1SAndreas Gruenbacher spin_lock(&mdev->peer_seq_lock); 19053c13b680SLars Ellenberg newest_peer_seq = seq_max(mdev->peer_seq, peer_seq); 19063c13b680SLars Ellenberg mdev->peer_seq = newest_peer_seq; 19073e394da1SAndreas Gruenbacher spin_unlock(&mdev->peer_seq_lock); 19083c13b680SLars Ellenberg /* wake up only if we actually changed mdev->peer_seq */ 19093c13b680SLars Ellenberg if (peer_seq == newest_peer_seq) 19103e394da1SAndreas Gruenbacher wake_up(&mdev->seq_wait); 19113e394da1SAndreas Gruenbacher } 19127be8da07SAndreas Gruenbacher } 19133e394da1SAndreas Gruenbacher 1914b411b363SPhilipp Reisner /* Called from receive_Data. 1915b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1916b411b363SPhilipp Reisner * 1917b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1918b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1919b411b363SPhilipp Reisner * been sent. 1920b411b363SPhilipp Reisner * 1921b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1922b411b363SPhilipp Reisner * 1923b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1924b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1925b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1926b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1927b411b363SPhilipp Reisner * 1928b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1929b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1930b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1931b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1932b411b363SPhilipp Reisner * 1933b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1934b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 19357be8da07SAndreas Gruenbacher static int wait_for_and_update_peer_seq(struct drbd_conf *mdev, const u32 peer_seq) 1936b411b363SPhilipp Reisner { 1937b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1938b411b363SPhilipp Reisner long timeout; 19397be8da07SAndreas Gruenbacher int ret; 19407be8da07SAndreas Gruenbacher 19417be8da07SAndreas Gruenbacher if (!need_peer_seq(mdev)) 19427be8da07SAndreas Gruenbacher return 0; 19437be8da07SAndreas Gruenbacher 1944b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1945b411b363SPhilipp Reisner for (;;) { 19467be8da07SAndreas Gruenbacher if (!seq_greater(peer_seq - 1, mdev->peer_seq)) { 19477be8da07SAndreas Gruenbacher mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); 19487be8da07SAndreas Gruenbacher ret = 0; 1949b411b363SPhilipp Reisner break; 19507be8da07SAndreas Gruenbacher } 1951b411b363SPhilipp Reisner if (signal_pending(current)) { 1952b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1953b411b363SPhilipp Reisner break; 1954b411b363SPhilipp Reisner } 19557be8da07SAndreas Gruenbacher prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1956b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 195744ed167dSPhilipp Reisner rcu_read_lock(); 195844ed167dSPhilipp Reisner timeout = rcu_dereference(mdev->tconn->net_conf)->ping_timeo*HZ/10; 195944ed167dSPhilipp Reisner rcu_read_unlock(); 196071b1c1ebSAndreas Gruenbacher timeout = schedule_timeout(timeout); 1961b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 19627be8da07SAndreas Gruenbacher if (!timeout) { 1963b411b363SPhilipp Reisner ret = -ETIMEDOUT; 196471b1c1ebSAndreas Gruenbacher dev_err(DEV, "Timed out waiting for missing ack packets; disconnecting\n"); 1965b411b363SPhilipp Reisner break; 1966b411b363SPhilipp Reisner } 1967b411b363SPhilipp Reisner } 1968b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 19697be8da07SAndreas Gruenbacher finish_wait(&mdev->seq_wait, &wait); 1970b411b363SPhilipp Reisner return ret; 1971b411b363SPhilipp Reisner } 1972b411b363SPhilipp Reisner 1973688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1974688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1975688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1976688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 197776d2e7ecSPhilipp Reisner { 197876d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 197976d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1980688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 198176d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 198276d2e7ecSPhilipp Reisner } 198376d2e7ecSPhilipp Reisner 19847be8da07SAndreas Gruenbacher static void fail_postponed_requests(struct drbd_conf *mdev, sector_t sector, 19857be8da07SAndreas Gruenbacher unsigned int size) 19867be8da07SAndreas Gruenbacher { 19877be8da07SAndreas Gruenbacher struct drbd_interval *i; 19887be8da07SAndreas Gruenbacher 19897be8da07SAndreas Gruenbacher repeat: 19907be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 19917be8da07SAndreas Gruenbacher struct drbd_request *req; 19927be8da07SAndreas Gruenbacher struct bio_and_error m; 19937be8da07SAndreas Gruenbacher 19947be8da07SAndreas Gruenbacher if (!i->local) 19957be8da07SAndreas Gruenbacher continue; 19967be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 19977be8da07SAndreas Gruenbacher if (!(req->rq_state & RQ_POSTPONED)) 19987be8da07SAndreas Gruenbacher continue; 19997be8da07SAndreas Gruenbacher req->rq_state &= ~RQ_POSTPONED; 20007be8da07SAndreas Gruenbacher __req_mod(req, NEG_ACKED, &m); 20017be8da07SAndreas Gruenbacher spin_unlock_irq(&mdev->tconn->req_lock); 20027be8da07SAndreas Gruenbacher if (m.bio) 20037be8da07SAndreas Gruenbacher complete_master_bio(mdev, &m); 20047be8da07SAndreas Gruenbacher spin_lock_irq(&mdev->tconn->req_lock); 20057be8da07SAndreas Gruenbacher goto repeat; 20067be8da07SAndreas Gruenbacher } 20077be8da07SAndreas Gruenbacher } 20087be8da07SAndreas Gruenbacher 20097be8da07SAndreas Gruenbacher static int handle_write_conflicts(struct drbd_conf *mdev, 20107be8da07SAndreas Gruenbacher struct drbd_peer_request *peer_req) 20117be8da07SAndreas Gruenbacher { 20127be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 20137be8da07SAndreas Gruenbacher bool resolve_conflicts = test_bit(DISCARD_CONCURRENT, &tconn->flags); 20147be8da07SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 20157be8da07SAndreas Gruenbacher const unsigned int size = peer_req->i.size; 20167be8da07SAndreas Gruenbacher struct drbd_interval *i; 20177be8da07SAndreas Gruenbacher bool equal; 20187be8da07SAndreas Gruenbacher int err; 20197be8da07SAndreas Gruenbacher 20207be8da07SAndreas Gruenbacher /* 20217be8da07SAndreas Gruenbacher * Inserting the peer request into the write_requests tree will prevent 20227be8da07SAndreas Gruenbacher * new conflicting local requests from being added. 20237be8da07SAndreas Gruenbacher */ 20247be8da07SAndreas Gruenbacher drbd_insert_interval(&mdev->write_requests, &peer_req->i); 20257be8da07SAndreas Gruenbacher 20267be8da07SAndreas Gruenbacher repeat: 20277be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 20287be8da07SAndreas Gruenbacher if (i == &peer_req->i) 20297be8da07SAndreas Gruenbacher continue; 20307be8da07SAndreas Gruenbacher 20317be8da07SAndreas Gruenbacher if (!i->local) { 20327be8da07SAndreas Gruenbacher /* 20337be8da07SAndreas Gruenbacher * Our peer has sent a conflicting remote request; this 20347be8da07SAndreas Gruenbacher * should not happen in a two-node setup. Wait for the 20357be8da07SAndreas Gruenbacher * earlier peer request to complete. 20367be8da07SAndreas Gruenbacher */ 20377be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, i); 20387be8da07SAndreas Gruenbacher if (err) 20397be8da07SAndreas Gruenbacher goto out; 20407be8da07SAndreas Gruenbacher goto repeat; 20417be8da07SAndreas Gruenbacher } 20427be8da07SAndreas Gruenbacher 20437be8da07SAndreas Gruenbacher equal = i->sector == sector && i->size == size; 20447be8da07SAndreas Gruenbacher if (resolve_conflicts) { 20457be8da07SAndreas Gruenbacher /* 20467be8da07SAndreas Gruenbacher * If the peer request is fully contained within the 20477be8da07SAndreas Gruenbacher * overlapping request, it can be discarded; otherwise, 20487be8da07SAndreas Gruenbacher * it will be retried once all overlapping requests 20497be8da07SAndreas Gruenbacher * have completed. 20507be8da07SAndreas Gruenbacher */ 20517be8da07SAndreas Gruenbacher bool discard = i->sector <= sector && i->sector + 20527be8da07SAndreas Gruenbacher (i->size >> 9) >= sector + (size >> 9); 20537be8da07SAndreas Gruenbacher 20547be8da07SAndreas Gruenbacher if (!equal) 20557be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 20567be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u, " 20577be8da07SAndreas Gruenbacher "assuming %s came first\n", 20587be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 20597be8da07SAndreas Gruenbacher (unsigned long long)sector, size, 20607be8da07SAndreas Gruenbacher discard ? "local" : "remote"); 20617be8da07SAndreas Gruenbacher 20627be8da07SAndreas Gruenbacher inc_unacked(mdev); 20637be8da07SAndreas Gruenbacher peer_req->w.cb = discard ? e_send_discard_write : 20647be8da07SAndreas Gruenbacher e_send_retry_write; 20657be8da07SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->done_ee); 20667be8da07SAndreas Gruenbacher wake_asender(mdev->tconn); 20677be8da07SAndreas Gruenbacher 20687be8da07SAndreas Gruenbacher err = -ENOENT; 20697be8da07SAndreas Gruenbacher goto out; 20707be8da07SAndreas Gruenbacher } else { 20717be8da07SAndreas Gruenbacher struct drbd_request *req = 20727be8da07SAndreas Gruenbacher container_of(i, struct drbd_request, i); 20737be8da07SAndreas Gruenbacher 20747be8da07SAndreas Gruenbacher if (!equal) 20757be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 20767be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u\n", 20777be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 20787be8da07SAndreas Gruenbacher (unsigned long long)sector, size); 20797be8da07SAndreas Gruenbacher 20807be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 20817be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) { 20827be8da07SAndreas Gruenbacher /* 20837be8da07SAndreas Gruenbacher * Wait for the node with the discard flag to 20847be8da07SAndreas Gruenbacher * decide if this request will be discarded or 20857be8da07SAndreas Gruenbacher * retried. Requests that are discarded will 20867be8da07SAndreas Gruenbacher * disappear from the write_requests tree. 20877be8da07SAndreas Gruenbacher * 20887be8da07SAndreas Gruenbacher * In addition, wait for the conflicting 20897be8da07SAndreas Gruenbacher * request to finish locally before submitting 20907be8da07SAndreas Gruenbacher * the conflicting peer request. 20917be8da07SAndreas Gruenbacher */ 20927be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, &req->i); 20937be8da07SAndreas Gruenbacher if (err) { 20947be8da07SAndreas Gruenbacher _conn_request_state(mdev->tconn, 20957be8da07SAndreas Gruenbacher NS(conn, C_TIMEOUT), 20967be8da07SAndreas Gruenbacher CS_HARD); 20977be8da07SAndreas Gruenbacher fail_postponed_requests(mdev, sector, size); 20987be8da07SAndreas Gruenbacher goto out; 20997be8da07SAndreas Gruenbacher } 21007be8da07SAndreas Gruenbacher goto repeat; 21017be8da07SAndreas Gruenbacher } 21027be8da07SAndreas Gruenbacher /* 21037be8da07SAndreas Gruenbacher * Remember to restart the conflicting requests after 21047be8da07SAndreas Gruenbacher * the new peer request has completed. 21057be8da07SAndreas Gruenbacher */ 21067be8da07SAndreas Gruenbacher peer_req->flags |= EE_RESTART_REQUESTS; 21077be8da07SAndreas Gruenbacher } 21087be8da07SAndreas Gruenbacher } 21097be8da07SAndreas Gruenbacher err = 0; 21107be8da07SAndreas Gruenbacher 21117be8da07SAndreas Gruenbacher out: 21127be8da07SAndreas Gruenbacher if (err) 21137be8da07SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 21147be8da07SAndreas Gruenbacher return err; 21157be8da07SAndreas Gruenbacher } 21167be8da07SAndreas Gruenbacher 2117b411b363SPhilipp Reisner /* mirrored write */ 21184a76b161SAndreas Gruenbacher static int receive_Data(struct drbd_tconn *tconn, struct packet_info *pi) 2119b411b363SPhilipp Reisner { 21204a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2121b411b363SPhilipp Reisner sector_t sector; 2122db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2123e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 21247be8da07SAndreas Gruenbacher u32 peer_seq = be32_to_cpu(p->seq_num); 2125b411b363SPhilipp Reisner int rw = WRITE; 2126b411b363SPhilipp Reisner u32 dp_flags; 2127302bdeaeSPhilipp Reisner int err, tp; 21287be8da07SAndreas Gruenbacher 21294a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 21304a76b161SAndreas Gruenbacher if (!mdev) 21314a76b161SAndreas Gruenbacher return -EIO; 21324a76b161SAndreas Gruenbacher 2133b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 213482bc0194SAndreas Gruenbacher int err2; 213582bc0194SAndreas Gruenbacher 21367be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 2137e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 213812038a3aSPhilipp Reisner atomic_inc(&tconn->current_epoch->epoch_size); 2139e2857216SAndreas Gruenbacher err2 = drbd_drain_block(mdev, pi->size); 214082bc0194SAndreas Gruenbacher if (!err) 214182bc0194SAndreas Gruenbacher err = err2; 214282bc0194SAndreas Gruenbacher return err; 2143b411b363SPhilipp Reisner } 2144b411b363SPhilipp Reisner 2145fcefa62eSAndreas Gruenbacher /* 2146fcefa62eSAndreas Gruenbacher * Corresponding put_ldev done either below (on various errors), or in 2147fcefa62eSAndreas Gruenbacher * drbd_peer_request_endio, if we successfully submit the data at the 2148fcefa62eSAndreas Gruenbacher * end of this function. 2149fcefa62eSAndreas Gruenbacher */ 2150b411b363SPhilipp Reisner 2151b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2152e2857216SAndreas Gruenbacher peer_req = read_in_block(mdev, p->block_id, sector, pi->size); 2153db830c46SAndreas Gruenbacher if (!peer_req) { 2154b411b363SPhilipp Reisner put_ldev(mdev); 215582bc0194SAndreas Gruenbacher return -EIO; 2156b411b363SPhilipp Reisner } 2157b411b363SPhilipp Reisner 2158db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_block; 2159b411b363SPhilipp Reisner 2160688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 2161688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 2162688593c5SLars Ellenberg 2163688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 2164db830c46SAndreas Gruenbacher peer_req->flags |= EE_MAY_SET_IN_SYNC; 2165688593c5SLars Ellenberg 216612038a3aSPhilipp Reisner spin_lock(&tconn->epoch_lock); 216712038a3aSPhilipp Reisner peer_req->epoch = tconn->current_epoch; 2168db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->epoch_size); 2169db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->active); 217012038a3aSPhilipp Reisner spin_unlock(&tconn->epoch_lock); 2171b411b363SPhilipp Reisner 2172302bdeaeSPhilipp Reisner rcu_read_lock(); 2173302bdeaeSPhilipp Reisner tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; 2174302bdeaeSPhilipp Reisner rcu_read_unlock(); 2175302bdeaeSPhilipp Reisner if (tp) { 2176302bdeaeSPhilipp Reisner peer_req->flags |= EE_IN_INTERVAL_TREE; 21777be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 21787be8da07SAndreas Gruenbacher if (err) 2179b411b363SPhilipp Reisner goto out_interrupted; 218087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 21817be8da07SAndreas Gruenbacher err = handle_write_conflicts(mdev, peer_req); 21827be8da07SAndreas Gruenbacher if (err) { 218387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 21847be8da07SAndreas Gruenbacher if (err == -ENOENT) { 2185b411b363SPhilipp Reisner put_ldev(mdev); 218682bc0194SAndreas Gruenbacher return 0; 2187b411b363SPhilipp Reisner } 2188b411b363SPhilipp Reisner goto out_interrupted; 2189b411b363SPhilipp Reisner } 21907be8da07SAndreas Gruenbacher } else 219187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2192db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->active_ee); 219387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2194b411b363SPhilipp Reisner 2195303d1448SPhilipp Reisner if (mdev->tconn->agreed_pro_version < 100) { 219644ed167dSPhilipp Reisner rcu_read_lock(); 219744ed167dSPhilipp Reisner switch (rcu_dereference(mdev->tconn->net_conf)->wire_protocol) { 2198b411b363SPhilipp Reisner case DRBD_PROT_C: 2199303d1448SPhilipp Reisner dp_flags |= DP_SEND_WRITE_ACK; 2200303d1448SPhilipp Reisner break; 2201303d1448SPhilipp Reisner case DRBD_PROT_B: 2202303d1448SPhilipp Reisner dp_flags |= DP_SEND_RECEIVE_ACK; 2203303d1448SPhilipp Reisner break; 2204303d1448SPhilipp Reisner } 220544ed167dSPhilipp Reisner rcu_read_unlock(); 2206303d1448SPhilipp Reisner } 2207303d1448SPhilipp Reisner 2208303d1448SPhilipp Reisner if (dp_flags & DP_SEND_WRITE_ACK) { 2209303d1448SPhilipp Reisner peer_req->flags |= EE_SEND_WRITE_ACK; 2210b411b363SPhilipp Reisner inc_unacked(mdev); 2211b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 2212b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 2213303d1448SPhilipp Reisner } 2214303d1448SPhilipp Reisner 2215303d1448SPhilipp Reisner if (dp_flags & DP_SEND_RECEIVE_ACK) { 2216b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 2217b411b363SPhilipp Reisner * sends on the msock, but anyways */ 2218db830c46SAndreas Gruenbacher drbd_send_ack(mdev, P_RECV_ACK, peer_req); 2219b411b363SPhilipp Reisner } 2220b411b363SPhilipp Reisner 22216719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 2222b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 2223db830c46SAndreas Gruenbacher drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); 2224db830c46SAndreas Gruenbacher peer_req->flags |= EE_CALL_AL_COMPLETE_IO; 2225db830c46SAndreas Gruenbacher peer_req->flags &= ~EE_MAY_SET_IN_SYNC; 2226181286adSLars Ellenberg drbd_al_begin_io(mdev, &peer_req->i); 2227b411b363SPhilipp Reisner } 2228b411b363SPhilipp Reisner 222982bc0194SAndreas Gruenbacher err = drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR); 223082bc0194SAndreas Gruenbacher if (!err) 223182bc0194SAndreas Gruenbacher return 0; 2232b411b363SPhilipp Reisner 223310f6d992SLars Ellenberg /* don't care for the reason here */ 223410f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 223587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2236db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 2237db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 223887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2239db830c46SAndreas Gruenbacher if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) 2240181286adSLars Ellenberg drbd_al_complete_io(mdev, &peer_req->i); 224122cc37a9SLars Ellenberg 2242b411b363SPhilipp Reisner out_interrupted: 22431e9dd291SPhilipp Reisner drbd_may_finish_epoch(tconn, peer_req->epoch, EV_PUT + EV_CLEANUP); 2244b411b363SPhilipp Reisner put_ldev(mdev); 22453967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 224682bc0194SAndreas Gruenbacher return err; 2247b411b363SPhilipp Reisner } 2248b411b363SPhilipp Reisner 22490f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 22500f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 22510f0601f4SLars Ellenberg * 22520f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 22530f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 22540f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 22550f0601f4SLars Ellenberg * activity, it obviously is "busy". 22560f0601f4SLars Ellenberg * 22570f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 22580f0601f4SLars Ellenberg * to have a short time average so we can react faster. 22590f0601f4SLars Ellenberg */ 2260e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 22610f0601f4SLars Ellenberg { 22620f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 22630f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 2264e3555d85SPhilipp Reisner struct lc_element *tmp; 22650f0601f4SLars Ellenberg int curr_events; 22660f0601f4SLars Ellenberg int throttle = 0; 2267daeda1ccSPhilipp Reisner unsigned int c_min_rate; 2268daeda1ccSPhilipp Reisner 2269daeda1ccSPhilipp Reisner rcu_read_lock(); 2270daeda1ccSPhilipp Reisner c_min_rate = rcu_dereference(mdev->ldev->disk_conf)->c_min_rate; 2271daeda1ccSPhilipp Reisner rcu_read_unlock(); 22720f0601f4SLars Ellenberg 22730f0601f4SLars Ellenberg /* feature disabled? */ 2274daeda1ccSPhilipp Reisner if (c_min_rate == 0) 22750f0601f4SLars Ellenberg return 0; 22760f0601f4SLars Ellenberg 2277e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 2278e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 2279e3555d85SPhilipp Reisner if (tmp) { 2280e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 2281e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 2282e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2283e3555d85SPhilipp Reisner return 0; 2284e3555d85SPhilipp Reisner } 2285e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 2286e3555d85SPhilipp Reisner } 2287e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2288e3555d85SPhilipp Reisner 22890f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 22900f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 22910f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 2292e3555d85SPhilipp Reisner 22930f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 22940f0601f4SLars Ellenberg unsigned long rs_left; 22950f0601f4SLars Ellenberg int i; 22960f0601f4SLars Ellenberg 22970f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 22980f0601f4SLars Ellenberg 22990f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 23000f0601f4SLars Ellenberg * approx. */ 23012649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 23022649f080SLars Ellenberg 23032649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 23042649f080SLars Ellenberg rs_left = mdev->ov_left; 23052649f080SLars Ellenberg else 23060f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 23070f0601f4SLars Ellenberg 23080f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 23090f0601f4SLars Ellenberg if (!dt) 23100f0601f4SLars Ellenberg dt++; 23110f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 23120f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 23130f0601f4SLars Ellenberg 2314daeda1ccSPhilipp Reisner if (dbdt > c_min_rate) 23150f0601f4SLars Ellenberg throttle = 1; 23160f0601f4SLars Ellenberg } 23170f0601f4SLars Ellenberg return throttle; 23180f0601f4SLars Ellenberg } 23190f0601f4SLars Ellenberg 23200f0601f4SLars Ellenberg 23214a76b161SAndreas Gruenbacher static int receive_DataRequest(struct drbd_tconn *tconn, struct packet_info *pi) 2322b411b363SPhilipp Reisner { 23234a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2324b411b363SPhilipp Reisner sector_t sector; 23254a76b161SAndreas Gruenbacher sector_t capacity; 2326db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2327b411b363SPhilipp Reisner struct digest_info *di = NULL; 2328b18b37beSPhilipp Reisner int size, verb; 2329b411b363SPhilipp Reisner unsigned int fault_type; 2330e658983aSAndreas Gruenbacher struct p_block_req *p = pi->data; 23314a76b161SAndreas Gruenbacher 23324a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 23334a76b161SAndreas Gruenbacher if (!mdev) 23344a76b161SAndreas Gruenbacher return -EIO; 23354a76b161SAndreas Gruenbacher capacity = drbd_get_capacity(mdev->this_bdev); 2336b411b363SPhilipp Reisner 2337b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2338b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2339b411b363SPhilipp Reisner 2340c670a398SAndreas Gruenbacher if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { 2341b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2342b411b363SPhilipp Reisner (unsigned long long)sector, size); 234382bc0194SAndreas Gruenbacher return -EINVAL; 2344b411b363SPhilipp Reisner } 2345b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 2346b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2347b411b363SPhilipp Reisner (unsigned long long)sector, size); 234882bc0194SAndreas Gruenbacher return -EINVAL; 2349b411b363SPhilipp Reisner } 2350b411b363SPhilipp Reisner 2351b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 2352b18b37beSPhilipp Reisner verb = 1; 2353e2857216SAndreas Gruenbacher switch (pi->cmd) { 2354b18b37beSPhilipp Reisner case P_DATA_REQUEST: 2355b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 2356b18b37beSPhilipp Reisner break; 2357b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2358b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2359b18b37beSPhilipp Reisner case P_OV_REQUEST: 2360b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 2361b18b37beSPhilipp Reisner break; 2362b18b37beSPhilipp Reisner case P_OV_REPLY: 2363b18b37beSPhilipp Reisner verb = 0; 2364b18b37beSPhilipp Reisner dec_rs_pending(mdev); 2365b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 2366b18b37beSPhilipp Reisner break; 2367b18b37beSPhilipp Reisner default: 236849ba9b1bSAndreas Gruenbacher BUG(); 2369b18b37beSPhilipp Reisner } 2370b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2371b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2372b411b363SPhilipp Reisner "no local data.\n"); 2373b18b37beSPhilipp Reisner 2374a821cc4aSLars Ellenberg /* drain possibly payload */ 2375e2857216SAndreas Gruenbacher return drbd_drain_block(mdev, pi->size); 2376b411b363SPhilipp Reisner } 2377b411b363SPhilipp Reisner 2378b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2379b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2380b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 23810db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, p->block_id, sector, size, GFP_NOIO); 2382db830c46SAndreas Gruenbacher if (!peer_req) { 2383b411b363SPhilipp Reisner put_ldev(mdev); 238482bc0194SAndreas Gruenbacher return -ENOMEM; 2385b411b363SPhilipp Reisner } 2386b411b363SPhilipp Reisner 2387e2857216SAndreas Gruenbacher switch (pi->cmd) { 2388b411b363SPhilipp Reisner case P_DATA_REQUEST: 2389db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_data_req; 2390b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 239180a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 239280a40e43SLars Ellenberg goto submit; 239380a40e43SLars Ellenberg 2394b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2395db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_rsdata_req; 2396b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 23975f9915bbSLars Ellenberg /* used in the sector offset progress display */ 23985f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2399b411b363SPhilipp Reisner break; 2400b411b363SPhilipp Reisner 2401b411b363SPhilipp Reisner case P_OV_REPLY: 2402b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2403b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2404e2857216SAndreas Gruenbacher di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); 2405b411b363SPhilipp Reisner if (!di) 2406b411b363SPhilipp Reisner goto out_free_e; 2407b411b363SPhilipp Reisner 2408e2857216SAndreas Gruenbacher di->digest_size = pi->size; 2409b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2410b411b363SPhilipp Reisner 2411db830c46SAndreas Gruenbacher peer_req->digest = di; 2412db830c46SAndreas Gruenbacher peer_req->flags |= EE_HAS_DIGEST; 2413c36c3cedSLars Ellenberg 2414e2857216SAndreas Gruenbacher if (drbd_recv_all(mdev->tconn, di->digest, pi->size)) 2415b411b363SPhilipp Reisner goto out_free_e; 2416b411b363SPhilipp Reisner 2417e2857216SAndreas Gruenbacher if (pi->cmd == P_CSUM_RS_REQUEST) { 241831890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 2419db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_csum_rs_req; 24205f9915bbSLars Ellenberg /* used in the sector offset progress display */ 24215f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2422e2857216SAndreas Gruenbacher } else if (pi->cmd == P_OV_REPLY) { 24232649f080SLars Ellenberg /* track progress, we may need to throttle */ 24242649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2425db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_reply; 2426b411b363SPhilipp Reisner dec_rs_pending(mdev); 24270f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 24280f0601f4SLars Ellenberg * but accounting still needs to be done. */ 24290f0601f4SLars Ellenberg goto submit_for_resync; 2430b411b363SPhilipp Reisner } 2431b411b363SPhilipp Reisner break; 2432b411b363SPhilipp Reisner 2433b411b363SPhilipp Reisner case P_OV_REQUEST: 2434b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 243531890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90) { 2436de228bbaSLars Ellenberg unsigned long now = jiffies; 2437de228bbaSLars Ellenberg int i; 2438b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2439b411b363SPhilipp Reisner mdev->ov_position = sector; 244030b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 244130b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2442de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2443de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2444de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2445de228bbaSLars Ellenberg } 2446b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2447b411b363SPhilipp Reisner (unsigned long long)sector); 2448b411b363SPhilipp Reisner } 2449db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_req; 2450b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2451b411b363SPhilipp Reisner break; 2452b411b363SPhilipp Reisner 2453b411b363SPhilipp Reisner default: 245449ba9b1bSAndreas Gruenbacher BUG(); 2455b411b363SPhilipp Reisner } 2456b411b363SPhilipp Reisner 24570f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 24580f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 24590f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 24600f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 24610f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 24620f0601f4SLars Ellenberg * 24630f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 24640f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 24650f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 24660f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 24670f0601f4SLars Ellenberg * a while, anyways. 24680f0601f4SLars Ellenberg */ 2469b411b363SPhilipp Reisner 24700f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 24710f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 24720f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 24730f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 24740f0601f4SLars Ellenberg * 24750f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 24760f0601f4SLars Ellenberg * we would also throttle its application reads. 24770f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 24780f0601f4SLars Ellenberg */ 2479e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2480e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2481e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 248280a40e43SLars Ellenberg goto out_free_e; 2483b411b363SPhilipp Reisner 24840f0601f4SLars Ellenberg submit_for_resync: 24850f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 24860f0601f4SLars Ellenberg 248780a40e43SLars Ellenberg submit: 2488b411b363SPhilipp Reisner inc_unacked(mdev); 248987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2490db830c46SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->read_ee); 249187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2492b411b363SPhilipp Reisner 2493fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0) 249482bc0194SAndreas Gruenbacher return 0; 2495b411b363SPhilipp Reisner 249610f6d992SLars Ellenberg /* don't care for the reason here */ 249710f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 249887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2499db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 250087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 250122cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 250222cc37a9SLars Ellenberg 2503b411b363SPhilipp Reisner out_free_e: 2504b411b363SPhilipp Reisner put_ldev(mdev); 25053967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 250682bc0194SAndreas Gruenbacher return -EIO; 2507b411b363SPhilipp Reisner } 2508b411b363SPhilipp Reisner 2509b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2510b411b363SPhilipp Reisner { 2511b411b363SPhilipp Reisner int self, peer, rv = -100; 2512b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 251344ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_0p; 2514b411b363SPhilipp Reisner 2515b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2516b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2517b411b363SPhilipp Reisner 2518b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2519b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2520b411b363SPhilipp Reisner 252144ed167dSPhilipp Reisner rcu_read_lock(); 252244ed167dSPhilipp Reisner after_sb_0p = rcu_dereference(mdev->tconn->net_conf)->after_sb_0p; 252344ed167dSPhilipp Reisner rcu_read_unlock(); 252444ed167dSPhilipp Reisner switch (after_sb_0p) { 2525b411b363SPhilipp Reisner case ASB_CONSENSUS: 2526b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2527b411b363SPhilipp Reisner case ASB_CALL_HELPER: 252844ed167dSPhilipp Reisner case ASB_VIOLENTLY: 2529b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2530b411b363SPhilipp Reisner break; 2531b411b363SPhilipp Reisner case ASB_DISCONNECT: 2532b411b363SPhilipp Reisner break; 2533b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2534b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2535b411b363SPhilipp Reisner rv = -1; 2536b411b363SPhilipp Reisner break; 2537b411b363SPhilipp Reisner } 2538b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2539b411b363SPhilipp Reisner rv = 1; 2540b411b363SPhilipp Reisner break; 2541b411b363SPhilipp Reisner } 2542b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2543b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2544b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2545b411b363SPhilipp Reisner rv = 1; 2546b411b363SPhilipp Reisner break; 2547b411b363SPhilipp Reisner } 2548b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2549b411b363SPhilipp Reisner rv = -1; 2550b411b363SPhilipp Reisner break; 2551b411b363SPhilipp Reisner } 2552b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2553ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2554b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2555b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2556b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 255725703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2558b411b363SPhilipp Reisner ? -1 : 1; 2559b411b363SPhilipp Reisner break; 2560b411b363SPhilipp Reisner } else { 2561b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2562b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2563b411b363SPhilipp Reisner } 256444ed167dSPhilipp Reisner if (after_sb_0p == ASB_DISCARD_ZERO_CHG) 2565b411b363SPhilipp Reisner break; 2566b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2567b411b363SPhilipp Reisner if (ch_self < ch_peer) 2568b411b363SPhilipp Reisner rv = -1; 2569b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2570b411b363SPhilipp Reisner rv = 1; 2571b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2572b411b363SPhilipp Reisner /* Well, then use something else. */ 257325703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2574b411b363SPhilipp Reisner ? -1 : 1; 2575b411b363SPhilipp Reisner break; 2576b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2577b411b363SPhilipp Reisner rv = -1; 2578b411b363SPhilipp Reisner break; 2579b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2580b411b363SPhilipp Reisner rv = 1; 2581b411b363SPhilipp Reisner } 2582b411b363SPhilipp Reisner 2583b411b363SPhilipp Reisner return rv; 2584b411b363SPhilipp Reisner } 2585b411b363SPhilipp Reisner 2586b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2587b411b363SPhilipp Reisner { 25886184ea21SAndreas Gruenbacher int hg, rv = -100; 258944ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_1p; 2590b411b363SPhilipp Reisner 259144ed167dSPhilipp Reisner rcu_read_lock(); 259244ed167dSPhilipp Reisner after_sb_1p = rcu_dereference(mdev->tconn->net_conf)->after_sb_1p; 259344ed167dSPhilipp Reisner rcu_read_unlock(); 259444ed167dSPhilipp Reisner switch (after_sb_1p) { 2595b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2596b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2597b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2598b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2599b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 260044ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2601b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2602b411b363SPhilipp Reisner break; 2603b411b363SPhilipp Reisner case ASB_DISCONNECT: 2604b411b363SPhilipp Reisner break; 2605b411b363SPhilipp Reisner case ASB_CONSENSUS: 2606b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2607b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2608b411b363SPhilipp Reisner rv = hg; 2609b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2610b411b363SPhilipp Reisner rv = hg; 2611b411b363SPhilipp Reisner break; 2612b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2613b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2614b411b363SPhilipp Reisner break; 2615b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2616b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2617b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2618b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2619b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2620bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2621bb437946SAndreas Gruenbacher 2622bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2623b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2624b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2625b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2626bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2627bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2628b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2629b411b363SPhilipp Reisner } else { 2630b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2631b411b363SPhilipp Reisner rv = hg; 2632b411b363SPhilipp Reisner } 2633b411b363SPhilipp Reisner } else 2634b411b363SPhilipp Reisner rv = hg; 2635b411b363SPhilipp Reisner } 2636b411b363SPhilipp Reisner 2637b411b363SPhilipp Reisner return rv; 2638b411b363SPhilipp Reisner } 2639b411b363SPhilipp Reisner 2640b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2641b411b363SPhilipp Reisner { 26426184ea21SAndreas Gruenbacher int hg, rv = -100; 264344ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_2p; 2644b411b363SPhilipp Reisner 264544ed167dSPhilipp Reisner rcu_read_lock(); 264644ed167dSPhilipp Reisner after_sb_2p = rcu_dereference(mdev->tconn->net_conf)->after_sb_2p; 264744ed167dSPhilipp Reisner rcu_read_unlock(); 264844ed167dSPhilipp Reisner switch (after_sb_2p) { 2649b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2650b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2651b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2652b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2653b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2654b411b363SPhilipp Reisner case ASB_CONSENSUS: 2655b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 265644ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2657b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2658b411b363SPhilipp Reisner break; 2659b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2660b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2661b411b363SPhilipp Reisner break; 2662b411b363SPhilipp Reisner case ASB_DISCONNECT: 2663b411b363SPhilipp Reisner break; 2664b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2665b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2666b411b363SPhilipp Reisner if (hg == -1) { 2667bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2668bb437946SAndreas Gruenbacher 2669b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2670b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2671b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2672bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2673bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2674b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2675b411b363SPhilipp Reisner } else { 2676b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2677b411b363SPhilipp Reisner rv = hg; 2678b411b363SPhilipp Reisner } 2679b411b363SPhilipp Reisner } else 2680b411b363SPhilipp Reisner rv = hg; 2681b411b363SPhilipp Reisner } 2682b411b363SPhilipp Reisner 2683b411b363SPhilipp Reisner return rv; 2684b411b363SPhilipp Reisner } 2685b411b363SPhilipp Reisner 2686b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2687b411b363SPhilipp Reisner u64 bits, u64 flags) 2688b411b363SPhilipp Reisner { 2689b411b363SPhilipp Reisner if (!uuid) { 2690b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2691b411b363SPhilipp Reisner return; 2692b411b363SPhilipp Reisner } 2693b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2694b411b363SPhilipp Reisner text, 2695b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2696b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2697b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2698b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2699b411b363SPhilipp Reisner (unsigned long long)bits, 2700b411b363SPhilipp Reisner (unsigned long long)flags); 2701b411b363SPhilipp Reisner } 2702b411b363SPhilipp Reisner 2703b411b363SPhilipp Reisner /* 2704b411b363SPhilipp Reisner 100 after split brain try auto recover 2705b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2706b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2707b411b363SPhilipp Reisner 0 no Sync 2708b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2709b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2710b411b363SPhilipp Reisner -100 after split brain, disconnect 2711b411b363SPhilipp Reisner -1000 unrelated data 27124a23f264SPhilipp Reisner -1091 requires proto 91 27134a23f264SPhilipp Reisner -1096 requires proto 96 2714b411b363SPhilipp Reisner */ 2715b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2716b411b363SPhilipp Reisner { 2717b411b363SPhilipp Reisner u64 self, peer; 2718b411b363SPhilipp Reisner int i, j; 2719b411b363SPhilipp Reisner 2720b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2721b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2722b411b363SPhilipp Reisner 2723b411b363SPhilipp Reisner *rule_nr = 10; 2724b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2725b411b363SPhilipp Reisner return 0; 2726b411b363SPhilipp Reisner 2727b411b363SPhilipp Reisner *rule_nr = 20; 2728b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2729b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2730b411b363SPhilipp Reisner return -2; 2731b411b363SPhilipp Reisner 2732b411b363SPhilipp Reisner *rule_nr = 30; 2733b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2734b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2735b411b363SPhilipp Reisner return 2; 2736b411b363SPhilipp Reisner 2737b411b363SPhilipp Reisner if (self == peer) { 2738b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2739b411b363SPhilipp Reisner 2740b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2741b411b363SPhilipp Reisner 274231890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27434a23f264SPhilipp Reisner return -1091; 2744b411b363SPhilipp Reisner 2745b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2746b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2747b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2748b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2749b411b363SPhilipp Reisner 2750b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2751b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2752b411b363SPhilipp Reisner *rule_nr = 34; 2753b411b363SPhilipp Reisner } else { 2754b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2755b411b363SPhilipp Reisner *rule_nr = 36; 2756b411b363SPhilipp Reisner } 2757b411b363SPhilipp Reisner 2758b411b363SPhilipp Reisner return 1; 2759b411b363SPhilipp Reisner } 2760b411b363SPhilipp Reisner 2761b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2762b411b363SPhilipp Reisner 276331890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27644a23f264SPhilipp Reisner return -1091; 2765b411b363SPhilipp Reisner 2766b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2767b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2768b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2769b411b363SPhilipp Reisner 2770b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2771b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2772b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2773b411b363SPhilipp Reisner 2774b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2775b411b363SPhilipp Reisner *rule_nr = 35; 2776b411b363SPhilipp Reisner } else { 2777b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2778b411b363SPhilipp Reisner *rule_nr = 37; 2779b411b363SPhilipp Reisner } 2780b411b363SPhilipp Reisner 2781b411b363SPhilipp Reisner return -1; 2782b411b363SPhilipp Reisner } 2783b411b363SPhilipp Reisner 2784b411b363SPhilipp Reisner /* Common power [off|failure] */ 2785b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2786b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2787b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2788b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2789b411b363SPhilipp Reisner *rule_nr = 40; 2790b411b363SPhilipp Reisner 2791b411b363SPhilipp Reisner switch (rct) { 2792b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2793b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2794b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2795b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 279625703f83SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 2797b411b363SPhilipp Reisner return dc ? -1 : 1; 2798b411b363SPhilipp Reisner } 2799b411b363SPhilipp Reisner } 2800b411b363SPhilipp Reisner 2801b411b363SPhilipp Reisner *rule_nr = 50; 2802b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2803b411b363SPhilipp Reisner if (self == peer) 2804b411b363SPhilipp Reisner return -1; 2805b411b363SPhilipp Reisner 2806b411b363SPhilipp Reisner *rule_nr = 51; 2807b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2808b411b363SPhilipp Reisner if (self == peer) { 280931890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 28104a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 28114a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 28124a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2813b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2814b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2815b411b363SPhilipp Reisner 281631890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 28174a23f264SPhilipp Reisner return -1091; 2818b411b363SPhilipp Reisner 2819b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2820b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 28214a23f264SPhilipp Reisner 28224a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 28234a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 28244a23f264SPhilipp Reisner 2825b411b363SPhilipp Reisner return -1; 2826b411b363SPhilipp Reisner } 2827b411b363SPhilipp Reisner } 2828b411b363SPhilipp Reisner 2829b411b363SPhilipp Reisner *rule_nr = 60; 2830b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2831b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2832b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2833b411b363SPhilipp Reisner if (self == peer) 2834b411b363SPhilipp Reisner return -2; 2835b411b363SPhilipp Reisner } 2836b411b363SPhilipp Reisner 2837b411b363SPhilipp Reisner *rule_nr = 70; 2838b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2839b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2840b411b363SPhilipp Reisner if (self == peer) 2841b411b363SPhilipp Reisner return 1; 2842b411b363SPhilipp Reisner 2843b411b363SPhilipp Reisner *rule_nr = 71; 2844b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2845b411b363SPhilipp Reisner if (self == peer) { 284631890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 28474a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 28484a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 28494a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2850b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2851b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2852b411b363SPhilipp Reisner 285331890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 28544a23f264SPhilipp Reisner return -1091; 2855b411b363SPhilipp Reisner 2856b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2857b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2858b411b363SPhilipp Reisner 28594a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2860b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2861b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2862b411b363SPhilipp Reisner 2863b411b363SPhilipp Reisner return 1; 2864b411b363SPhilipp Reisner } 2865b411b363SPhilipp Reisner } 2866b411b363SPhilipp Reisner 2867b411b363SPhilipp Reisner 2868b411b363SPhilipp Reisner *rule_nr = 80; 2869d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2870b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2871b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2872b411b363SPhilipp Reisner if (self == peer) 2873b411b363SPhilipp Reisner return 2; 2874b411b363SPhilipp Reisner } 2875b411b363SPhilipp Reisner 2876b411b363SPhilipp Reisner *rule_nr = 90; 2877b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2878b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2879b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2880b411b363SPhilipp Reisner return 100; 2881b411b363SPhilipp Reisner 2882b411b363SPhilipp Reisner *rule_nr = 100; 2883b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2884b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2885b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2886b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2887b411b363SPhilipp Reisner if (self == peer) 2888b411b363SPhilipp Reisner return -100; 2889b411b363SPhilipp Reisner } 2890b411b363SPhilipp Reisner } 2891b411b363SPhilipp Reisner 2892b411b363SPhilipp Reisner return -1000; 2893b411b363SPhilipp Reisner } 2894b411b363SPhilipp Reisner 2895b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2896b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2897b411b363SPhilipp Reisner */ 2898b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2899b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2900b411b363SPhilipp Reisner { 2901b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2902b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 290344ed167dSPhilipp Reisner struct net_conf *nc; 29046dff2902SAndreas Gruenbacher int hg, rule_nr, rr_conflict, tentative; 2905b411b363SPhilipp Reisner 2906b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2907b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2908b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2909b411b363SPhilipp Reisner 2910b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2911b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2912b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2913b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2914b411b363SPhilipp Reisner 2915b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2916b411b363SPhilipp Reisner 2917b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2918b411b363SPhilipp Reisner 2919b411b363SPhilipp Reisner if (hg == -1000) { 2920b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2921b411b363SPhilipp Reisner return C_MASK; 2922b411b363SPhilipp Reisner } 29234a23f264SPhilipp Reisner if (hg < -1000) { 29244a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2925b411b363SPhilipp Reisner return C_MASK; 2926b411b363SPhilipp Reisner } 2927b411b363SPhilipp Reisner 2928b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2929b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2930b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2931b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2932b411b363SPhilipp Reisner if (f) 2933b411b363SPhilipp Reisner hg = hg*2; 2934b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2935b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2936b411b363SPhilipp Reisner } 2937b411b363SPhilipp Reisner 29383a11a487SAdam Gandelman if (abs(hg) == 100) 29393a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 29403a11a487SAdam Gandelman 294144ed167dSPhilipp Reisner rcu_read_lock(); 294244ed167dSPhilipp Reisner nc = rcu_dereference(mdev->tconn->net_conf); 294344ed167dSPhilipp Reisner 294444ed167dSPhilipp Reisner if (hg == 100 || (hg == -100 && nc->always_asbp)) { 2945b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2946b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2947b411b363SPhilipp Reisner int forced = (hg == -100); 2948b411b363SPhilipp Reisner 2949b411b363SPhilipp Reisner switch (pcount) { 2950b411b363SPhilipp Reisner case 0: 2951b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2952b411b363SPhilipp Reisner break; 2953b411b363SPhilipp Reisner case 1: 2954b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2955b411b363SPhilipp Reisner break; 2956b411b363SPhilipp Reisner case 2: 2957b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2958b411b363SPhilipp Reisner break; 2959b411b363SPhilipp Reisner } 2960b411b363SPhilipp Reisner if (abs(hg) < 100) { 2961b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2962b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2963b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2964b411b363SPhilipp Reisner if (forced) { 2965b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2966b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2967b411b363SPhilipp Reisner hg = hg*2; 2968b411b363SPhilipp Reisner } 2969b411b363SPhilipp Reisner } 2970b411b363SPhilipp Reisner } 2971b411b363SPhilipp Reisner 2972b411b363SPhilipp Reisner if (hg == -100) { 297308b165baSPhilipp Reisner if (test_bit(DISCARD_MY_DATA, &mdev->flags) && !(mdev->p_uuid[UI_FLAGS]&1)) 2974b411b363SPhilipp Reisner hg = -1; 297508b165baSPhilipp Reisner if (!test_bit(DISCARD_MY_DATA, &mdev->flags) && (mdev->p_uuid[UI_FLAGS]&1)) 2976b411b363SPhilipp Reisner hg = 1; 2977b411b363SPhilipp Reisner 2978b411b363SPhilipp Reisner if (abs(hg) < 100) 2979b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2980b411b363SPhilipp Reisner "Sync from %s node\n", 2981b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2982b411b363SPhilipp Reisner } 298344ed167dSPhilipp Reisner rr_conflict = nc->rr_conflict; 29846dff2902SAndreas Gruenbacher tentative = nc->tentative; 298544ed167dSPhilipp Reisner rcu_read_unlock(); 2986b411b363SPhilipp Reisner 2987b411b363SPhilipp Reisner if (hg == -100) { 2988580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2989580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2990580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2991580b9767SLars Ellenberg * to that disk, in a way... */ 29923a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2993b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2994b411b363SPhilipp Reisner return C_MASK; 2995b411b363SPhilipp Reisner } 2996b411b363SPhilipp Reisner 2997b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2998b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2999b411b363SPhilipp Reisner return C_MASK; 3000b411b363SPhilipp Reisner } 3001b411b363SPhilipp Reisner 3002b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 3003b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 300444ed167dSPhilipp Reisner switch (rr_conflict) { 3005b411b363SPhilipp Reisner case ASB_CALL_HELPER: 3006b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 3007b411b363SPhilipp Reisner /* fall through */ 3008b411b363SPhilipp Reisner case ASB_DISCONNECT: 3009b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 3010b411b363SPhilipp Reisner return C_MASK; 3011b411b363SPhilipp Reisner case ASB_VIOLENTLY: 3012b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 3013b411b363SPhilipp Reisner "assumption\n"); 3014b411b363SPhilipp Reisner } 3015b411b363SPhilipp Reisner } 3016b411b363SPhilipp Reisner 30176dff2902SAndreas Gruenbacher if (tentative || test_bit(CONN_DRY_RUN, &mdev->tconn->flags)) { 3018cf14c2e9SPhilipp Reisner if (hg == 0) 3019cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 3020cf14c2e9SPhilipp Reisner else 3021cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 3022cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 3023cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 3024cf14c2e9SPhilipp Reisner return C_MASK; 3025cf14c2e9SPhilipp Reisner } 3026cf14c2e9SPhilipp Reisner 3027b411b363SPhilipp Reisner if (abs(hg) >= 2) { 3028b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 302920ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 303020ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 3031b411b363SPhilipp Reisner return C_MASK; 3032b411b363SPhilipp Reisner } 3033b411b363SPhilipp Reisner 3034b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 3035b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 3036b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 3037b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 3038b411b363SPhilipp Reisner } else { 3039b411b363SPhilipp Reisner rv = C_CONNECTED; 3040b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 3041b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 3042b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 3043b411b363SPhilipp Reisner } 3044b411b363SPhilipp Reisner } 3045b411b363SPhilipp Reisner 3046b411b363SPhilipp Reisner return rv; 3047b411b363SPhilipp Reisner } 3048b411b363SPhilipp Reisner 3049f179d76dSPhilipp Reisner static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) 3050b411b363SPhilipp Reisner { 3051b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 3052f179d76dSPhilipp Reisner if (peer == ASB_DISCARD_REMOTE) 3053f179d76dSPhilipp Reisner return ASB_DISCARD_LOCAL; 3054b411b363SPhilipp Reisner 3055b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 3056f179d76dSPhilipp Reisner if (peer == ASB_DISCARD_LOCAL) 3057f179d76dSPhilipp Reisner return ASB_DISCARD_REMOTE; 3058b411b363SPhilipp Reisner 3059b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 3060f179d76dSPhilipp Reisner return peer; 3061b411b363SPhilipp Reisner } 3062b411b363SPhilipp Reisner 3063e2857216SAndreas Gruenbacher static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi) 3064b411b363SPhilipp Reisner { 3065e658983aSAndreas Gruenbacher struct p_protocol *p = pi->data; 3066036b17eaSPhilipp Reisner enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 3067036b17eaSPhilipp Reisner int p_proto, p_discard_my_data, p_two_primaries, cf; 3068036b17eaSPhilipp Reisner struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; 3069036b17eaSPhilipp Reisner char integrity_alg[SHARED_SECRET_MAX] = ""; 3070accdbcc5SAndreas Gruenbacher struct crypto_hash *peer_integrity_tfm = NULL; 30717aca6c75SPhilipp Reisner void *int_dig_in = NULL, *int_dig_vv = NULL; 3072b411b363SPhilipp Reisner 3073b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 3074b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 3075b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 3076b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 3077b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 3078cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 30796139f60dSAndreas Gruenbacher p_discard_my_data = cf & CF_DISCARD_MY_DATA; 3080cf14c2e9SPhilipp Reisner 308186db0618SAndreas Gruenbacher if (tconn->agreed_pro_version >= 87) { 308286db0618SAndreas Gruenbacher int err; 308386db0618SAndreas Gruenbacher 308488104ca4SAndreas Gruenbacher if (pi->size > sizeof(integrity_alg)) 308586db0618SAndreas Gruenbacher return -EIO; 308688104ca4SAndreas Gruenbacher err = drbd_recv_all(tconn, integrity_alg, pi->size); 308786db0618SAndreas Gruenbacher if (err) 308886db0618SAndreas Gruenbacher return err; 308988104ca4SAndreas Gruenbacher integrity_alg[SHARED_SECRET_MAX - 1] = 0; 3090036b17eaSPhilipp Reisner } 309186db0618SAndreas Gruenbacher 30927d4c782cSAndreas Gruenbacher if (pi->cmd != P_PROTOCOL_UPDATE) { 30937204624cSPhilipp Reisner clear_bit(CONN_DRY_RUN, &tconn->flags); 3094cf14c2e9SPhilipp Reisner 3095cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 30967204624cSPhilipp Reisner set_bit(CONN_DRY_RUN, &tconn->flags); 3097b411b363SPhilipp Reisner 309844ed167dSPhilipp Reisner rcu_read_lock(); 309944ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 310044ed167dSPhilipp Reisner 3101036b17eaSPhilipp Reisner if (p_proto != nc->wire_protocol) { 3102d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "protocol"); 310344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3104b411b363SPhilipp Reisner } 3105b411b363SPhilipp Reisner 3106f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { 3107d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "after-sb-0pri"); 310844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3109b411b363SPhilipp Reisner } 3110b411b363SPhilipp Reisner 3111f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { 3112d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "after-sb-1pri"); 311344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3114b411b363SPhilipp Reisner } 3115b411b363SPhilipp Reisner 3116f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { 3117d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "after-sb-2pri"); 311844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3119b411b363SPhilipp Reisner } 3120b411b363SPhilipp Reisner 31216139f60dSAndreas Gruenbacher if (p_discard_my_data && nc->discard_my_data) { 3122d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "discard-my-data"); 312344ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3124b411b363SPhilipp Reisner } 3125b411b363SPhilipp Reisner 312644ed167dSPhilipp Reisner if (p_two_primaries != nc->two_primaries) { 3127d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "allow-two-primaries"); 312844ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3129b411b363SPhilipp Reisner } 3130b411b363SPhilipp Reisner 3131036b17eaSPhilipp Reisner if (strcmp(integrity_alg, nc->integrity_alg)) { 3132d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "data-integrity-alg"); 3133036b17eaSPhilipp Reisner goto disconnect_rcu_unlock; 3134036b17eaSPhilipp Reisner } 3135036b17eaSPhilipp Reisner 313686db0618SAndreas Gruenbacher rcu_read_unlock(); 3137fbc12f45SAndreas Gruenbacher } 31387d4c782cSAndreas Gruenbacher 31397d4c782cSAndreas Gruenbacher if (integrity_alg[0]) { 31407d4c782cSAndreas Gruenbacher int hash_size; 31417d4c782cSAndreas Gruenbacher 31427d4c782cSAndreas Gruenbacher /* 31437d4c782cSAndreas Gruenbacher * We can only change the peer data integrity algorithm 31447d4c782cSAndreas Gruenbacher * here. Changing our own data integrity algorithm 31457d4c782cSAndreas Gruenbacher * requires that we send a P_PROTOCOL_UPDATE packet at 31467d4c782cSAndreas Gruenbacher * the same time; otherwise, the peer has no way to 31477d4c782cSAndreas Gruenbacher * tell between which packets the algorithm should 31487d4c782cSAndreas Gruenbacher * change. 31497d4c782cSAndreas Gruenbacher */ 31507d4c782cSAndreas Gruenbacher 31517d4c782cSAndreas Gruenbacher peer_integrity_tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC); 31527d4c782cSAndreas Gruenbacher if (!peer_integrity_tfm) { 31537d4c782cSAndreas Gruenbacher conn_err(tconn, "peer data-integrity-alg %s not supported\n", 31547d4c782cSAndreas Gruenbacher integrity_alg); 31557d4c782cSAndreas Gruenbacher goto disconnect; 31567d4c782cSAndreas Gruenbacher } 31577d4c782cSAndreas Gruenbacher 31587d4c782cSAndreas Gruenbacher hash_size = crypto_hash_digestsize(peer_integrity_tfm); 31597d4c782cSAndreas Gruenbacher int_dig_in = kmalloc(hash_size, GFP_KERNEL); 31607d4c782cSAndreas Gruenbacher int_dig_vv = kmalloc(hash_size, GFP_KERNEL); 31617d4c782cSAndreas Gruenbacher if (!(int_dig_in && int_dig_vv)) { 31627d4c782cSAndreas Gruenbacher conn_err(tconn, "Allocation of buffers for data integrity checking failed\n"); 31637d4c782cSAndreas Gruenbacher goto disconnect; 31647d4c782cSAndreas Gruenbacher } 31657d4c782cSAndreas Gruenbacher } 31667d4c782cSAndreas Gruenbacher 31677d4c782cSAndreas Gruenbacher new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); 31687d4c782cSAndreas Gruenbacher if (!new_net_conf) { 31697d4c782cSAndreas Gruenbacher conn_err(tconn, "Allocation of new net_conf failed\n"); 31707d4c782cSAndreas Gruenbacher goto disconnect; 31717d4c782cSAndreas Gruenbacher } 31727d4c782cSAndreas Gruenbacher 31737d4c782cSAndreas Gruenbacher mutex_lock(&tconn->data.mutex); 31747d4c782cSAndreas Gruenbacher mutex_lock(&tconn->conf_update); 31757d4c782cSAndreas Gruenbacher old_net_conf = tconn->net_conf; 31767d4c782cSAndreas Gruenbacher *new_net_conf = *old_net_conf; 31777d4c782cSAndreas Gruenbacher 31787d4c782cSAndreas Gruenbacher new_net_conf->wire_protocol = p_proto; 31797d4c782cSAndreas Gruenbacher new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); 31807d4c782cSAndreas Gruenbacher new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); 31817d4c782cSAndreas Gruenbacher new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); 31827d4c782cSAndreas Gruenbacher new_net_conf->two_primaries = p_two_primaries; 31837d4c782cSAndreas Gruenbacher 31847d4c782cSAndreas Gruenbacher rcu_assign_pointer(tconn->net_conf, new_net_conf); 31857d4c782cSAndreas Gruenbacher mutex_unlock(&tconn->conf_update); 31867d4c782cSAndreas Gruenbacher mutex_unlock(&tconn->data.mutex); 31877d4c782cSAndreas Gruenbacher 31887d4c782cSAndreas Gruenbacher crypto_free_hash(tconn->peer_integrity_tfm); 31897d4c782cSAndreas Gruenbacher kfree(tconn->int_dig_in); 31907d4c782cSAndreas Gruenbacher kfree(tconn->int_dig_vv); 31917d4c782cSAndreas Gruenbacher tconn->peer_integrity_tfm = peer_integrity_tfm; 31927d4c782cSAndreas Gruenbacher tconn->int_dig_in = int_dig_in; 31937d4c782cSAndreas Gruenbacher tconn->int_dig_vv = int_dig_vv; 31947d4c782cSAndreas Gruenbacher 31957d4c782cSAndreas Gruenbacher if (strcmp(old_net_conf->integrity_alg, integrity_alg)) 31967d4c782cSAndreas Gruenbacher conn_info(tconn, "peer data-integrity-alg: %s\n", 31977d4c782cSAndreas Gruenbacher integrity_alg[0] ? integrity_alg : "(none)"); 31987d4c782cSAndreas Gruenbacher 31997d4c782cSAndreas Gruenbacher synchronize_rcu(); 32007d4c782cSAndreas Gruenbacher kfree(old_net_conf); 320182bc0194SAndreas Gruenbacher return 0; 3202b411b363SPhilipp Reisner 320344ed167dSPhilipp Reisner disconnect_rcu_unlock: 320444ed167dSPhilipp Reisner rcu_read_unlock(); 3205b411b363SPhilipp Reisner disconnect: 3206b792c35cSAndreas Gruenbacher crypto_free_hash(peer_integrity_tfm); 3207036b17eaSPhilipp Reisner kfree(int_dig_in); 3208036b17eaSPhilipp Reisner kfree(int_dig_vv); 32097204624cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 321082bc0194SAndreas Gruenbacher return -EIO; 3211b411b363SPhilipp Reisner } 3212b411b363SPhilipp Reisner 3213b411b363SPhilipp Reisner /* helper function 3214b411b363SPhilipp Reisner * input: alg name, feature name 3215b411b363SPhilipp Reisner * return: NULL (alg name was "") 3216b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 3217b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 3218b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 3219b411b363SPhilipp Reisner const char *alg, const char *name) 3220b411b363SPhilipp Reisner { 3221b411b363SPhilipp Reisner struct crypto_hash *tfm; 3222b411b363SPhilipp Reisner 3223b411b363SPhilipp Reisner if (!alg[0]) 3224b411b363SPhilipp Reisner return NULL; 3225b411b363SPhilipp Reisner 3226b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 3227b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 3228b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 3229b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 3230b411b363SPhilipp Reisner return tfm; 3231b411b363SPhilipp Reisner } 3232b411b363SPhilipp Reisner return tfm; 3233b411b363SPhilipp Reisner } 3234b411b363SPhilipp Reisner 32354a76b161SAndreas Gruenbacher static int ignore_remaining_packet(struct drbd_tconn *tconn, struct packet_info *pi) 3236b411b363SPhilipp Reisner { 32374a76b161SAndreas Gruenbacher void *buffer = tconn->data.rbuf; 32384a76b161SAndreas Gruenbacher int size = pi->size; 32394a76b161SAndreas Gruenbacher 32404a76b161SAndreas Gruenbacher while (size) { 32414a76b161SAndreas Gruenbacher int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); 32424a76b161SAndreas Gruenbacher s = drbd_recv(tconn, buffer, s); 32434a76b161SAndreas Gruenbacher if (s <= 0) { 32444a76b161SAndreas Gruenbacher if (s < 0) 32454a76b161SAndreas Gruenbacher return s; 32464a76b161SAndreas Gruenbacher break; 32474a76b161SAndreas Gruenbacher } 32484a76b161SAndreas Gruenbacher size -= s; 32494a76b161SAndreas Gruenbacher } 32504a76b161SAndreas Gruenbacher if (size) 32514a76b161SAndreas Gruenbacher return -EIO; 32524a76b161SAndreas Gruenbacher return 0; 32534a76b161SAndreas Gruenbacher } 32544a76b161SAndreas Gruenbacher 32554a76b161SAndreas Gruenbacher /* 32564a76b161SAndreas Gruenbacher * config_unknown_volume - device configuration command for unknown volume 32574a76b161SAndreas Gruenbacher * 32584a76b161SAndreas Gruenbacher * When a device is added to an existing connection, the node on which the 32594a76b161SAndreas Gruenbacher * device is added first will send configuration commands to its peer but the 32604a76b161SAndreas Gruenbacher * peer will not know about the device yet. It will warn and ignore these 32614a76b161SAndreas Gruenbacher * commands. Once the device is added on the second node, the second node will 32624a76b161SAndreas Gruenbacher * send the same device configuration commands, but in the other direction. 32634a76b161SAndreas Gruenbacher * 32644a76b161SAndreas Gruenbacher * (We can also end up here if drbd is misconfigured.) 32654a76b161SAndreas Gruenbacher */ 32664a76b161SAndreas Gruenbacher static int config_unknown_volume(struct drbd_tconn *tconn, struct packet_info *pi) 32674a76b161SAndreas Gruenbacher { 32682fcb8f30SAndreas Gruenbacher conn_warn(tconn, "%s packet received for volume %u, which is not configured locally\n", 32692fcb8f30SAndreas Gruenbacher cmdname(pi->cmd), pi->vnr); 32704a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 32714a76b161SAndreas Gruenbacher } 32724a76b161SAndreas Gruenbacher 32734a76b161SAndreas Gruenbacher static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi) 32744a76b161SAndreas Gruenbacher { 32754a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3276e658983aSAndreas Gruenbacher struct p_rs_param_95 *p; 3277b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 3278b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 3279b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 32802ec91e0eSPhilipp Reisner struct net_conf *old_net_conf, *new_net_conf = NULL; 3281813472ceSPhilipp Reisner struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; 32824a76b161SAndreas Gruenbacher const int apv = tconn->agreed_pro_version; 3283813472ceSPhilipp Reisner struct fifo_buffer *old_plan = NULL, *new_plan = NULL; 3284778f271dSPhilipp Reisner int fifo_size = 0; 328582bc0194SAndreas Gruenbacher int err; 3286b411b363SPhilipp Reisner 32874a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 32884a76b161SAndreas Gruenbacher if (!mdev) 32894a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 32904a76b161SAndreas Gruenbacher 3291b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 3292b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 3293b411b363SPhilipp Reisner + SHARED_SECRET_MAX 32948e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 32958e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 3296b411b363SPhilipp Reisner 3297e2857216SAndreas Gruenbacher if (pi->size > exp_max_sz) { 3298b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 3299e2857216SAndreas Gruenbacher pi->size, exp_max_sz); 330082bc0194SAndreas Gruenbacher return -EIO; 3301b411b363SPhilipp Reisner } 3302b411b363SPhilipp Reisner 3303b411b363SPhilipp Reisner if (apv <= 88) { 3304e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param); 3305e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 33068e26f9ccSPhilipp Reisner } else if (apv <= 94) { 3307e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_89); 3308e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3309b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 33108e26f9ccSPhilipp Reisner } else { 3311e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_95); 3312e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3313b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 3314b411b363SPhilipp Reisner } 3315b411b363SPhilipp Reisner 3316b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 3317e658983aSAndreas Gruenbacher p = pi->data; 3318b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 3319b411b363SPhilipp Reisner 3320e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, header_size); 332182bc0194SAndreas Gruenbacher if (err) 332282bc0194SAndreas Gruenbacher return err; 3323b411b363SPhilipp Reisner 3324813472ceSPhilipp Reisner mutex_lock(&mdev->tconn->conf_update); 3325813472ceSPhilipp Reisner old_net_conf = mdev->tconn->net_conf; 3326813472ceSPhilipp Reisner if (get_ldev(mdev)) { 3327daeda1ccSPhilipp Reisner new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); 3328daeda1ccSPhilipp Reisner if (!new_disk_conf) { 3329813472ceSPhilipp Reisner put_ldev(mdev); 3330813472ceSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3331daeda1ccSPhilipp Reisner dev_err(DEV, "Allocation of new disk_conf failed\n"); 3332daeda1ccSPhilipp Reisner return -ENOMEM; 3333f399002eSLars Ellenberg } 3334b411b363SPhilipp Reisner 3335daeda1ccSPhilipp Reisner old_disk_conf = mdev->ldev->disk_conf; 3336daeda1ccSPhilipp Reisner *new_disk_conf = *old_disk_conf; 3337daeda1ccSPhilipp Reisner 33386394b935SAndreas Gruenbacher new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); 3339813472ceSPhilipp Reisner } 3340daeda1ccSPhilipp Reisner 3341b411b363SPhilipp Reisner if (apv >= 88) { 3342b411b363SPhilipp Reisner if (apv == 88) { 3343b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 3344b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 3345b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 3346b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 3347813472ceSPhilipp Reisner err = -EIO; 3348813472ceSPhilipp Reisner goto reconnect; 3349b411b363SPhilipp Reisner } 3350b411b363SPhilipp Reisner 335182bc0194SAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size); 3352813472ceSPhilipp Reisner if (err) 3353813472ceSPhilipp Reisner goto reconnect; 3354b411b363SPhilipp Reisner /* we expect NUL terminated string */ 3355b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3356b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 3357b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 3358b411b363SPhilipp Reisner 3359b411b363SPhilipp Reisner } else /* apv >= 89 */ { 3360b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 3361b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3362b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 3363b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 3364b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 3365b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 3366b411b363SPhilipp Reisner } 3367b411b363SPhilipp Reisner 33682ec91e0eSPhilipp Reisner if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { 3369b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3370b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 33712ec91e0eSPhilipp Reisner old_net_conf->verify_alg, p->verify_alg); 3372b411b363SPhilipp Reisner goto disconnect; 3373b411b363SPhilipp Reisner } 3374b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 3375b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 3376b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 3377b411b363SPhilipp Reisner verify_tfm = NULL; 3378b411b363SPhilipp Reisner goto disconnect; 3379b411b363SPhilipp Reisner } 3380b411b363SPhilipp Reisner } 3381b411b363SPhilipp Reisner 33822ec91e0eSPhilipp Reisner if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { 3383b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3384b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 33852ec91e0eSPhilipp Reisner old_net_conf->csums_alg, p->csums_alg); 3386b411b363SPhilipp Reisner goto disconnect; 3387b411b363SPhilipp Reisner } 3388b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 3389b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 3390b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 3391b411b363SPhilipp Reisner csums_tfm = NULL; 3392b411b363SPhilipp Reisner goto disconnect; 3393b411b363SPhilipp Reisner } 3394b411b363SPhilipp Reisner } 3395b411b363SPhilipp Reisner 3396813472ceSPhilipp Reisner if (apv > 94 && new_disk_conf) { 3397daeda1ccSPhilipp Reisner new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 3398daeda1ccSPhilipp Reisner new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); 3399daeda1ccSPhilipp Reisner new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); 3400daeda1ccSPhilipp Reisner new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); 3401778f271dSPhilipp Reisner 3402daeda1ccSPhilipp Reisner fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; 34039958c857SPhilipp Reisner if (fifo_size != mdev->rs_plan_s->size) { 3404813472ceSPhilipp Reisner new_plan = fifo_alloc(fifo_size); 3405813472ceSPhilipp Reisner if (!new_plan) { 3406778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 3407f399002eSLars Ellenberg put_ldev(mdev); 3408778f271dSPhilipp Reisner goto disconnect; 3409778f271dSPhilipp Reisner } 3410778f271dSPhilipp Reisner } 34118e26f9ccSPhilipp Reisner } 3412b411b363SPhilipp Reisner 341391fd4dadSPhilipp Reisner if (verify_tfm || csums_tfm) { 34142ec91e0eSPhilipp Reisner new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 34152ec91e0eSPhilipp Reisner if (!new_net_conf) { 341691fd4dadSPhilipp Reisner dev_err(DEV, "Allocation of new net_conf failed\n"); 341791fd4dadSPhilipp Reisner goto disconnect; 341891fd4dadSPhilipp Reisner } 341991fd4dadSPhilipp Reisner 34202ec91e0eSPhilipp Reisner *new_net_conf = *old_net_conf; 342191fd4dadSPhilipp Reisner 3422b411b363SPhilipp Reisner if (verify_tfm) { 34232ec91e0eSPhilipp Reisner strcpy(new_net_conf->verify_alg, p->verify_alg); 34242ec91e0eSPhilipp Reisner new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; 3425f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->verify_tfm); 3426f399002eSLars Ellenberg mdev->tconn->verify_tfm = verify_tfm; 3427b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 3428b411b363SPhilipp Reisner } 3429b411b363SPhilipp Reisner if (csums_tfm) { 34302ec91e0eSPhilipp Reisner strcpy(new_net_conf->csums_alg, p->csums_alg); 34312ec91e0eSPhilipp Reisner new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; 3432f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->csums_tfm); 3433f399002eSLars Ellenberg mdev->tconn->csums_tfm = csums_tfm; 3434b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 3435b411b363SPhilipp Reisner } 34362ec91e0eSPhilipp Reisner rcu_assign_pointer(tconn->net_conf, new_net_conf); 343791fd4dadSPhilipp Reisner } 343891fd4dadSPhilipp Reisner } 343991fd4dadSPhilipp Reisner 3440813472ceSPhilipp Reisner if (new_disk_conf) { 3441daeda1ccSPhilipp Reisner rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); 3442813472ceSPhilipp Reisner put_ldev(mdev); 3443778f271dSPhilipp Reisner } 3444813472ceSPhilipp Reisner 3445813472ceSPhilipp Reisner if (new_plan) { 3446813472ceSPhilipp Reisner old_plan = mdev->rs_plan_s; 3447813472ceSPhilipp Reisner rcu_assign_pointer(mdev->rs_plan_s, new_plan); 3448813472ceSPhilipp Reisner } 3449daeda1ccSPhilipp Reisner 3450daeda1ccSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3451daeda1ccSPhilipp Reisner synchronize_rcu(); 3452daeda1ccSPhilipp Reisner if (new_net_conf) 3453daeda1ccSPhilipp Reisner kfree(old_net_conf); 3454daeda1ccSPhilipp Reisner kfree(old_disk_conf); 3455813472ceSPhilipp Reisner kfree(old_plan); 3456daeda1ccSPhilipp Reisner 345782bc0194SAndreas Gruenbacher return 0; 3458b411b363SPhilipp Reisner 3459813472ceSPhilipp Reisner reconnect: 3460813472ceSPhilipp Reisner if (new_disk_conf) { 3461813472ceSPhilipp Reisner put_ldev(mdev); 3462813472ceSPhilipp Reisner kfree(new_disk_conf); 3463813472ceSPhilipp Reisner } 3464813472ceSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3465813472ceSPhilipp Reisner return -EIO; 3466813472ceSPhilipp Reisner 3467b411b363SPhilipp Reisner disconnect: 3468813472ceSPhilipp Reisner kfree(new_plan); 3469813472ceSPhilipp Reisner if (new_disk_conf) { 3470813472ceSPhilipp Reisner put_ldev(mdev); 3471813472ceSPhilipp Reisner kfree(new_disk_conf); 3472813472ceSPhilipp Reisner } 3473a0095508SPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3474b411b363SPhilipp Reisner /* just for completeness: actually not needed, 3475b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 3476b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 3477b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 3478b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 347938fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 348082bc0194SAndreas Gruenbacher return -EIO; 3481b411b363SPhilipp Reisner } 3482b411b363SPhilipp Reisner 3483b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 3484b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 3485b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 3486b411b363SPhilipp Reisner { 3487b411b363SPhilipp Reisner sector_t d; 3488b411b363SPhilipp Reisner if (a == 0 || b == 0) 3489b411b363SPhilipp Reisner return; 3490b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 3491b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 3492b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 3493b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 3494b411b363SPhilipp Reisner } 3495b411b363SPhilipp Reisner 34964a76b161SAndreas Gruenbacher static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi) 3497b411b363SPhilipp Reisner { 34984a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3499e658983aSAndreas Gruenbacher struct p_sizes *p = pi->data; 3500b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 3501b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 3502b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 3503e89b591cSPhilipp Reisner enum dds_flags ddsf; 3504b411b363SPhilipp Reisner 35054a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 35064a76b161SAndreas Gruenbacher if (!mdev) 35074a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 35084a76b161SAndreas Gruenbacher 3509b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 3510b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 3511b411b363SPhilipp Reisner 3512b411b363SPhilipp Reisner /* just store the peer's disk size for now. 3513b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 3514b411b363SPhilipp Reisner mdev->p_size = p_size; 3515b411b363SPhilipp Reisner 3516b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3517daeda1ccSPhilipp Reisner rcu_read_lock(); 3518daeda1ccSPhilipp Reisner my_usize = rcu_dereference(mdev->ldev->disk_conf)->disk_size; 3519daeda1ccSPhilipp Reisner rcu_read_unlock(); 3520daeda1ccSPhilipp Reisner 3521b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 3522b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 3523b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 3524daeda1ccSPhilipp Reisner p_usize, my_usize); 3525b411b363SPhilipp Reisner 3526b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 3527b411b363SPhilipp Reisner * param exchange, choose the minimum */ 3528b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 3529daeda1ccSPhilipp Reisner p_usize = min_not_zero(my_usize, p_usize); 3530b411b363SPhilipp Reisner 3531b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3532b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3533ef5e44a6SPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, p_usize, 0) < 3534b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3535b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3536b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3537b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 353838fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 3539b411b363SPhilipp Reisner put_ldev(mdev); 354082bc0194SAndreas Gruenbacher return -EIO; 3541b411b363SPhilipp Reisner } 3542daeda1ccSPhilipp Reisner 3543daeda1ccSPhilipp Reisner if (my_usize != p_usize) { 3544daeda1ccSPhilipp Reisner struct disk_conf *old_disk_conf, *new_disk_conf = NULL; 3545daeda1ccSPhilipp Reisner 3546daeda1ccSPhilipp Reisner new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); 3547daeda1ccSPhilipp Reisner if (!new_disk_conf) { 3548daeda1ccSPhilipp Reisner dev_err(DEV, "Allocation of new disk_conf failed\n"); 3549daeda1ccSPhilipp Reisner put_ldev(mdev); 3550daeda1ccSPhilipp Reisner return -ENOMEM; 3551daeda1ccSPhilipp Reisner } 3552daeda1ccSPhilipp Reisner 3553daeda1ccSPhilipp Reisner mutex_lock(&mdev->tconn->conf_update); 3554daeda1ccSPhilipp Reisner old_disk_conf = mdev->ldev->disk_conf; 3555daeda1ccSPhilipp Reisner *new_disk_conf = *old_disk_conf; 3556daeda1ccSPhilipp Reisner new_disk_conf->disk_size = p_usize; 3557daeda1ccSPhilipp Reisner 3558daeda1ccSPhilipp Reisner rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); 3559daeda1ccSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3560daeda1ccSPhilipp Reisner synchronize_rcu(); 3561daeda1ccSPhilipp Reisner kfree(old_disk_conf); 3562daeda1ccSPhilipp Reisner 3563daeda1ccSPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3564daeda1ccSPhilipp Reisner (unsigned long)my_usize); 3565daeda1ccSPhilipp Reisner } 3566daeda1ccSPhilipp Reisner 3567b411b363SPhilipp Reisner put_ldev(mdev); 3568b411b363SPhilipp Reisner } 3569b411b363SPhilipp Reisner 3570e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3571b411b363SPhilipp Reisner if (get_ldev(mdev)) { 357224c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 3573b411b363SPhilipp Reisner put_ldev(mdev); 3574b411b363SPhilipp Reisner if (dd == dev_size_error) 357582bc0194SAndreas Gruenbacher return -EIO; 3576b411b363SPhilipp Reisner drbd_md_sync(mdev); 3577b411b363SPhilipp Reisner } else { 3578b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3579b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3580b411b363SPhilipp Reisner } 3581b411b363SPhilipp Reisner 358299432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 358399432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 358499432fccSPhilipp Reisner 3585b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3586b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3587b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3588b411b363SPhilipp Reisner ldsc = 1; 3589b411b363SPhilipp Reisner } 3590b411b363SPhilipp Reisner 3591b411b363SPhilipp Reisner put_ldev(mdev); 3592b411b363SPhilipp Reisner } 3593b411b363SPhilipp Reisner 3594b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3595b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3596b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3597b411b363SPhilipp Reisner /* we have different sizes, probably peer 3598b411b363SPhilipp Reisner * needs to know my new size... */ 3599e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3600b411b363SPhilipp Reisner } 3601b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3602b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3603b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3604e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3605e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3606e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3607b411b363SPhilipp Reisner else 3608e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3609e89b591cSPhilipp Reisner } else 3610b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3611b411b363SPhilipp Reisner } 3612b411b363SPhilipp Reisner } 3613b411b363SPhilipp Reisner 361482bc0194SAndreas Gruenbacher return 0; 3615b411b363SPhilipp Reisner } 3616b411b363SPhilipp Reisner 36174a76b161SAndreas Gruenbacher static int receive_uuids(struct drbd_tconn *tconn, struct packet_info *pi) 3618b411b363SPhilipp Reisner { 36194a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3620e658983aSAndreas Gruenbacher struct p_uuids *p = pi->data; 3621b411b363SPhilipp Reisner u64 *p_uuid; 362262b0da3aSLars Ellenberg int i, updated_uuids = 0; 3623b411b363SPhilipp Reisner 36244a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 36254a76b161SAndreas Gruenbacher if (!mdev) 36264a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 36274a76b161SAndreas Gruenbacher 3628b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3629b411b363SPhilipp Reisner 3630b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3631b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3632b411b363SPhilipp Reisner 3633b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3634b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3635b411b363SPhilipp Reisner 3636b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3637b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3638b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3639b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3640b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3641b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 364238fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 364382bc0194SAndreas Gruenbacher return -EIO; 3644b411b363SPhilipp Reisner } 3645b411b363SPhilipp Reisner 3646b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3647b411b363SPhilipp Reisner int skip_initial_sync = 3648b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 364931890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90 && 3650b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3651b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3652b411b363SPhilipp Reisner if (skip_initial_sync) { 3653b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3654b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 365520ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 365620ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3657b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3658b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3659b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3660b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3661b411b363SPhilipp Reisner drbd_md_sync(mdev); 366262b0da3aSLars Ellenberg updated_uuids = 1; 3663b411b363SPhilipp Reisner } 3664b411b363SPhilipp Reisner put_ldev(mdev); 366518a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 366618a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 366718a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 366818a50fa2SPhilipp Reisner for me. */ 366962b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3670b411b363SPhilipp Reisner } 3671b411b363SPhilipp Reisner 3672b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3673b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3674b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3675b411b363SPhilipp Reisner new disk state... */ 36768410da8fSPhilipp Reisner mutex_lock(mdev->state_mutex); 36778410da8fSPhilipp Reisner mutex_unlock(mdev->state_mutex); 3678b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 367962b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 368062b0da3aSLars Ellenberg 368162b0da3aSLars Ellenberg if (updated_uuids) 368262b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3683b411b363SPhilipp Reisner 368482bc0194SAndreas Gruenbacher return 0; 3685b411b363SPhilipp Reisner } 3686b411b363SPhilipp Reisner 3687b411b363SPhilipp Reisner /** 3688b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3689b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3690b411b363SPhilipp Reisner */ 3691b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3692b411b363SPhilipp Reisner { 3693b411b363SPhilipp Reisner union drbd_state ms; 3694b411b363SPhilipp Reisner 3695b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3696369bea63SPhilipp Reisner [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, 3697b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3698b411b363SPhilipp Reisner 3699b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3700b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3701b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3702b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3703b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3704b411b363SPhilipp Reisner }; 3705b411b363SPhilipp Reisner 3706b411b363SPhilipp Reisner ms.i = ps.i; 3707b411b363SPhilipp Reisner 3708b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3709b411b363SPhilipp Reisner ms.peer = ps.role; 3710b411b363SPhilipp Reisner ms.role = ps.peer; 3711b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3712b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3713b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3714b411b363SPhilipp Reisner 3715b411b363SPhilipp Reisner return ms; 3716b411b363SPhilipp Reisner } 3717b411b363SPhilipp Reisner 37184a76b161SAndreas Gruenbacher static int receive_req_state(struct drbd_tconn *tconn, struct packet_info *pi) 3719b411b363SPhilipp Reisner { 37204a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3721e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3722b411b363SPhilipp Reisner union drbd_state mask, val; 3723bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3724b411b363SPhilipp Reisner 37254a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 37264a76b161SAndreas Gruenbacher if (!mdev) 37274a76b161SAndreas Gruenbacher return -EIO; 37284a76b161SAndreas Gruenbacher 3729b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3730b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3731b411b363SPhilipp Reisner 373225703f83SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && 37338410da8fSPhilipp Reisner mutex_is_locked(mdev->state_mutex)) { 3734b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 373582bc0194SAndreas Gruenbacher return 0; 3736b411b363SPhilipp Reisner } 3737b411b363SPhilipp Reisner 3738b411b363SPhilipp Reisner mask = convert_state(mask); 3739b411b363SPhilipp Reisner val = convert_state(val); 3740b411b363SPhilipp Reisner 3741b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3742b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3743047cd4a6SPhilipp Reisner 3744b411b363SPhilipp Reisner drbd_md_sync(mdev); 3745b411b363SPhilipp Reisner 374682bc0194SAndreas Gruenbacher return 0; 3747b411b363SPhilipp Reisner } 3748b411b363SPhilipp Reisner 3749e2857216SAndreas Gruenbacher static int receive_req_conn_state(struct drbd_tconn *tconn, struct packet_info *pi) 3750dfafcc8aSPhilipp Reisner { 3751e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3752dfafcc8aSPhilipp Reisner union drbd_state mask, val; 3753dfafcc8aSPhilipp Reisner enum drbd_state_rv rv; 3754dfafcc8aSPhilipp Reisner 3755dfafcc8aSPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3756dfafcc8aSPhilipp Reisner val.i = be32_to_cpu(p->val); 3757dfafcc8aSPhilipp Reisner 3758dfafcc8aSPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &tconn->flags) && 3759dfafcc8aSPhilipp Reisner mutex_is_locked(&tconn->cstate_mutex)) { 3760dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG); 376182bc0194SAndreas Gruenbacher return 0; 3762dfafcc8aSPhilipp Reisner } 3763dfafcc8aSPhilipp Reisner 3764dfafcc8aSPhilipp Reisner mask = convert_state(mask); 3765dfafcc8aSPhilipp Reisner val = convert_state(val); 3766dfafcc8aSPhilipp Reisner 3767778bcf2eSPhilipp Reisner rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); 3768dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, rv); 3769dfafcc8aSPhilipp Reisner 377082bc0194SAndreas Gruenbacher return 0; 3771dfafcc8aSPhilipp Reisner } 3772dfafcc8aSPhilipp Reisner 37734a76b161SAndreas Gruenbacher static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi) 3774b411b363SPhilipp Reisner { 37754a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3776e658983aSAndreas Gruenbacher struct p_state *p = pi->data; 37774ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3778b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 377965d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3780b411b363SPhilipp Reisner int rv; 3781b411b363SPhilipp Reisner 37824a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 37834a76b161SAndreas Gruenbacher if (!mdev) 37844a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 37854a76b161SAndreas Gruenbacher 3786b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3787b411b363SPhilipp Reisner 3788b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3789b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3790b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3791b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3792b411b363SPhilipp Reisner } 3793b411b363SPhilipp Reisner 379487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3795b411b363SPhilipp Reisner retry: 379678bae59bSPhilipp Reisner os = ns = drbd_read_state(mdev); 379787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3798b411b363SPhilipp Reisner 3799b8853dbdSPhilipp Reisner /* If some other part of the code (asender thread, timeout) 3800b8853dbdSPhilipp Reisner * already decided to close the connection again, 3801b8853dbdSPhilipp Reisner * we must not "re-establish" it here. */ 3802b8853dbdSPhilipp Reisner if (os.conn <= C_TEAR_DOWN) 3803b8853dbdSPhilipp Reisner return false; 3804b8853dbdSPhilipp Reisner 38059bcd2521SPhilipp Reisner /* If this is the "end of sync" confirmation, usually the peer disk 38069bcd2521SPhilipp Reisner * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits 38079bcd2521SPhilipp Reisner * set) resync started in PausedSyncT, or if the timing of pause-/ 38089bcd2521SPhilipp Reisner * unpause-sync events has been "just right", the peer disk may 38099bcd2521SPhilipp Reisner * transition from D_CONSISTENT to D_UP_TO_DATE as well. 38109bcd2521SPhilipp Reisner */ 38119bcd2521SPhilipp Reisner if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && 38129bcd2521SPhilipp Reisner real_peer_disk == D_UP_TO_DATE && 3813e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3814e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3815e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3816e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3817e9ef7bb6SLars Ellenberg * syncing states. 3818e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3819e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3820e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3821e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3822e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3823e9ef7bb6SLars Ellenberg 3824e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3825e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3826e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3827e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3828e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3829e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3830e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 383182bc0194SAndreas Gruenbacher return 0; 3832e9ef7bb6SLars Ellenberg } 3833e9ef7bb6SLars Ellenberg } 3834e9ef7bb6SLars Ellenberg 3835e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3836e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3837e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3838e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3839e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3840e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3841e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3842e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3843e9ef7bb6SLars Ellenberg 38444ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 38454ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3846b411b363SPhilipp Reisner 384767531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 384867531718SPhilipp Reisner ns.conn = C_BEHIND; 384967531718SPhilipp Reisner 3850b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3851b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3852b411b363SPhilipp Reisner int cr; /* consider resync */ 3853b411b363SPhilipp Reisner 3854b411b363SPhilipp Reisner /* if we established a new connection */ 38554ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3856b411b363SPhilipp Reisner /* if we had an established connection 3857b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 38584ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3859b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 38604ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3861b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3862b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3863b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3864b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3865b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 38664ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3867b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3868b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3869b411b363SPhilipp Reisner 3870b411b363SPhilipp Reisner if (cr) 38714ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3872b411b363SPhilipp Reisner 3873b411b363SPhilipp Reisner put_ldev(mdev); 38744ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 38754ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3876b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 387782f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3878b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3879b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3880b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3881580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3882b411b363SPhilipp Reisner } else { 38838169e41bSPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags)) 388482bc0194SAndreas Gruenbacher return -EIO; 38854ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 388638fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 388782bc0194SAndreas Gruenbacher return -EIO; 3888b411b363SPhilipp Reisner } 3889b411b363SPhilipp Reisner } 3890b411b363SPhilipp Reisner } 3891b411b363SPhilipp Reisner 389287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 389378bae59bSPhilipp Reisner if (os.i != drbd_read_state(mdev).i) 3894b411b363SPhilipp Reisner goto retry; 3895b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3896b411b363SPhilipp Reisner ns.peer = peer_state.role; 3897b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3898b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 38994ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3900b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 39014ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 39022aebfabbSPhilipp Reisner if (ns.pdsk == D_CONSISTENT && drbd_suspended(mdev) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3903481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 39048554df1cSAndreas Gruenbacher /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this 3905481c6f50SPhilipp Reisner for temporal network outages! */ 390687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3907481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 39082f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 3909481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3910481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 391138fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); 391282bc0194SAndreas Gruenbacher return -EIO; 3913481c6f50SPhilipp Reisner } 391465d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 391578bae59bSPhilipp Reisner ns = drbd_read_state(mdev); 391687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3917b411b363SPhilipp Reisner 3918b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 391938fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 392082bc0194SAndreas Gruenbacher return -EIO; 3921b411b363SPhilipp Reisner } 3922b411b363SPhilipp Reisner 39234ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 39244ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3925b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3926b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3927b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3928b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3929b411b363SPhilipp Reisner drbd_send_uuids(mdev); 393043de7c85SPhilipp Reisner drbd_send_current_state(mdev); 3931b411b363SPhilipp Reisner } 3932b411b363SPhilipp Reisner } 3933b411b363SPhilipp Reisner 393408b165baSPhilipp Reisner clear_bit(DISCARD_MY_DATA, &mdev->flags); 3935b411b363SPhilipp Reisner 3936b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3937b411b363SPhilipp Reisner 393882bc0194SAndreas Gruenbacher return 0; 3939b411b363SPhilipp Reisner } 3940b411b363SPhilipp Reisner 39414a76b161SAndreas Gruenbacher static int receive_sync_uuid(struct drbd_tconn *tconn, struct packet_info *pi) 3942b411b363SPhilipp Reisner { 39434a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3944e658983aSAndreas Gruenbacher struct p_rs_uuid *p = pi->data; 39454a76b161SAndreas Gruenbacher 39464a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 39474a76b161SAndreas Gruenbacher if (!mdev) 39484a76b161SAndreas Gruenbacher return -EIO; 3949b411b363SPhilipp Reisner 3950b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3951b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3952c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3953b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3954b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3955b411b363SPhilipp Reisner 3956b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3957b411b363SPhilipp Reisner 3958b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3959b411b363SPhilipp Reisner _not_ be rotated into the history */ 3960b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3961b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3962b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3963b411b363SPhilipp Reisner 396462b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3965b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3966b411b363SPhilipp Reisner 3967b411b363SPhilipp Reisner put_ldev(mdev); 3968b411b363SPhilipp Reisner } else 3969b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3970b411b363SPhilipp Reisner 397182bc0194SAndreas Gruenbacher return 0; 3972b411b363SPhilipp Reisner } 3973b411b363SPhilipp Reisner 39742c46407dSAndreas Gruenbacher /** 39752c46407dSAndreas Gruenbacher * receive_bitmap_plain 39762c46407dSAndreas Gruenbacher * 39772c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 39782c46407dSAndreas Gruenbacher * code upon failure. 39792c46407dSAndreas Gruenbacher */ 39802c46407dSAndreas Gruenbacher static int 398150d0b1adSAndreas Gruenbacher receive_bitmap_plain(struct drbd_conf *mdev, unsigned int size, 3982e658983aSAndreas Gruenbacher unsigned long *p, struct bm_xfer_ctx *c) 3983b411b363SPhilipp Reisner { 398450d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - 398550d0b1adSAndreas Gruenbacher drbd_header_size(mdev->tconn); 3986e658983aSAndreas Gruenbacher unsigned int num_words = min_t(size_t, data_size / sizeof(*p), 398750d0b1adSAndreas Gruenbacher c->bm_words - c->word_offset); 3988e658983aSAndreas Gruenbacher unsigned int want = num_words * sizeof(*p); 39892c46407dSAndreas Gruenbacher int err; 3990b411b363SPhilipp Reisner 399150d0b1adSAndreas Gruenbacher if (want != size) { 399250d0b1adSAndreas Gruenbacher dev_err(DEV, "%s:want (%u) != size (%u)\n", __func__, want, size); 39932c46407dSAndreas Gruenbacher return -EIO; 3994b411b363SPhilipp Reisner } 3995b411b363SPhilipp Reisner if (want == 0) 39962c46407dSAndreas Gruenbacher return 0; 3997e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, want); 399882bc0194SAndreas Gruenbacher if (err) 39992c46407dSAndreas Gruenbacher return err; 4000b411b363SPhilipp Reisner 4001e658983aSAndreas Gruenbacher drbd_bm_merge_lel(mdev, c->word_offset, num_words, p); 4002b411b363SPhilipp Reisner 4003b411b363SPhilipp Reisner c->word_offset += num_words; 4004b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 4005b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 4006b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 4007b411b363SPhilipp Reisner 40082c46407dSAndreas Gruenbacher return 1; 4009b411b363SPhilipp Reisner } 4010b411b363SPhilipp Reisner 4011a02d1240SAndreas Gruenbacher static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) 4012a02d1240SAndreas Gruenbacher { 4013a02d1240SAndreas Gruenbacher return (enum drbd_bitmap_code)(p->encoding & 0x0f); 4014a02d1240SAndreas Gruenbacher } 4015a02d1240SAndreas Gruenbacher 4016a02d1240SAndreas Gruenbacher static int dcbp_get_start(struct p_compressed_bm *p) 4017a02d1240SAndreas Gruenbacher { 4018a02d1240SAndreas Gruenbacher return (p->encoding & 0x80) != 0; 4019a02d1240SAndreas Gruenbacher } 4020a02d1240SAndreas Gruenbacher 4021a02d1240SAndreas Gruenbacher static int dcbp_get_pad_bits(struct p_compressed_bm *p) 4022a02d1240SAndreas Gruenbacher { 4023a02d1240SAndreas Gruenbacher return (p->encoding >> 4) & 0x7; 4024a02d1240SAndreas Gruenbacher } 4025a02d1240SAndreas Gruenbacher 40262c46407dSAndreas Gruenbacher /** 40272c46407dSAndreas Gruenbacher * recv_bm_rle_bits 40282c46407dSAndreas Gruenbacher * 40292c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 40302c46407dSAndreas Gruenbacher * code upon failure. 40312c46407dSAndreas Gruenbacher */ 40322c46407dSAndreas Gruenbacher static int 4033b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 4034b411b363SPhilipp Reisner struct p_compressed_bm *p, 4035c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 4036c6d25cfeSPhilipp Reisner unsigned int len) 4037b411b363SPhilipp Reisner { 4038b411b363SPhilipp Reisner struct bitstream bs; 4039b411b363SPhilipp Reisner u64 look_ahead; 4040b411b363SPhilipp Reisner u64 rl; 4041b411b363SPhilipp Reisner u64 tmp; 4042b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 4043b411b363SPhilipp Reisner unsigned long e; 4044a02d1240SAndreas Gruenbacher int toggle = dcbp_get_start(p); 4045b411b363SPhilipp Reisner int have; 4046b411b363SPhilipp Reisner int bits; 4047b411b363SPhilipp Reisner 4048a02d1240SAndreas Gruenbacher bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); 4049b411b363SPhilipp Reisner 4050b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 4051b411b363SPhilipp Reisner if (bits < 0) 40522c46407dSAndreas Gruenbacher return -EIO; 4053b411b363SPhilipp Reisner 4054b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 4055b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 4056b411b363SPhilipp Reisner if (bits <= 0) 40572c46407dSAndreas Gruenbacher return -EIO; 4058b411b363SPhilipp Reisner 4059b411b363SPhilipp Reisner if (toggle) { 4060b411b363SPhilipp Reisner e = s + rl -1; 4061b411b363SPhilipp Reisner if (e >= c->bm_bits) { 4062b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 40632c46407dSAndreas Gruenbacher return -EIO; 4064b411b363SPhilipp Reisner } 4065b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 4066b411b363SPhilipp Reisner } 4067b411b363SPhilipp Reisner 4068b411b363SPhilipp Reisner if (have < bits) { 4069b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 4070b411b363SPhilipp Reisner have, bits, look_ahead, 4071b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 4072b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 40732c46407dSAndreas Gruenbacher return -EIO; 4074b411b363SPhilipp Reisner } 4075b411b363SPhilipp Reisner look_ahead >>= bits; 4076b411b363SPhilipp Reisner have -= bits; 4077b411b363SPhilipp Reisner 4078b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 4079b411b363SPhilipp Reisner if (bits < 0) 40802c46407dSAndreas Gruenbacher return -EIO; 4081b411b363SPhilipp Reisner look_ahead |= tmp << have; 4082b411b363SPhilipp Reisner have += bits; 4083b411b363SPhilipp Reisner } 4084b411b363SPhilipp Reisner 4085b411b363SPhilipp Reisner c->bit_offset = s; 4086b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 4087b411b363SPhilipp Reisner 40882c46407dSAndreas Gruenbacher return (s != c->bm_bits); 4089b411b363SPhilipp Reisner } 4090b411b363SPhilipp Reisner 40912c46407dSAndreas Gruenbacher /** 40922c46407dSAndreas Gruenbacher * decode_bitmap_c 40932c46407dSAndreas Gruenbacher * 40942c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 40952c46407dSAndreas Gruenbacher * code upon failure. 40962c46407dSAndreas Gruenbacher */ 40972c46407dSAndreas Gruenbacher static int 4098b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 4099b411b363SPhilipp Reisner struct p_compressed_bm *p, 4100c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 4101c6d25cfeSPhilipp Reisner unsigned int len) 4102b411b363SPhilipp Reisner { 4103a02d1240SAndreas Gruenbacher if (dcbp_get_code(p) == RLE_VLI_Bits) 4104e658983aSAndreas Gruenbacher return recv_bm_rle_bits(mdev, p, c, len - sizeof(*p)); 4105b411b363SPhilipp Reisner 4106b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 4107b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 4108b411b363SPhilipp Reisner * during all our tests. */ 4109b411b363SPhilipp Reisner 4110b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 411138fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 41122c46407dSAndreas Gruenbacher return -EIO; 4113b411b363SPhilipp Reisner } 4114b411b363SPhilipp Reisner 4115b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 4116b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 4117b411b363SPhilipp Reisner { 4118b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 411950d0b1adSAndreas Gruenbacher unsigned int header_size = drbd_header_size(mdev->tconn); 412050d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; 412150d0b1adSAndreas Gruenbacher unsigned int plain = 412250d0b1adSAndreas Gruenbacher header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + 412350d0b1adSAndreas Gruenbacher c->bm_words * sizeof(unsigned long); 412450d0b1adSAndreas Gruenbacher unsigned int total = c->bytes[0] + c->bytes[1]; 412550d0b1adSAndreas Gruenbacher unsigned int r; 4126b411b363SPhilipp Reisner 4127b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 4128b411b363SPhilipp Reisner if (total == 0) 4129b411b363SPhilipp Reisner return; 4130b411b363SPhilipp Reisner 4131b411b363SPhilipp Reisner /* don't report if not compressed */ 4132b411b363SPhilipp Reisner if (total >= plain) 4133b411b363SPhilipp Reisner return; 4134b411b363SPhilipp Reisner 4135b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 4136b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 4137b411b363SPhilipp Reisner : (1000 * total / plain); 4138b411b363SPhilipp Reisner 4139b411b363SPhilipp Reisner if (r > 1000) 4140b411b363SPhilipp Reisner r = 1000; 4141b411b363SPhilipp Reisner 4142b411b363SPhilipp Reisner r = 1000 - r; 4143b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 4144b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 4145b411b363SPhilipp Reisner direction, 4146b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 4147b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 4148b411b363SPhilipp Reisner total, r/10, r % 10); 4149b411b363SPhilipp Reisner } 4150b411b363SPhilipp Reisner 4151b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 4152b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 4153b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 4154b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 4155b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 4156b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 4157b411b363SPhilipp Reisner 4158b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 41594a76b161SAndreas Gruenbacher static int receive_bitmap(struct drbd_tconn *tconn, struct packet_info *pi) 4160b411b363SPhilipp Reisner { 41614a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 4162b411b363SPhilipp Reisner struct bm_xfer_ctx c; 41632c46407dSAndreas Gruenbacher int err; 41644a76b161SAndreas Gruenbacher 41654a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 41664a76b161SAndreas Gruenbacher if (!mdev) 41674a76b161SAndreas Gruenbacher return -EIO; 4168b411b363SPhilipp Reisner 416920ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 417020ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 417120ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 4172b411b363SPhilipp Reisner 4173b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 4174b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 4175b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 4176b411b363SPhilipp Reisner }; 4177b411b363SPhilipp Reisner 41782c46407dSAndreas Gruenbacher for(;;) { 4179e658983aSAndreas Gruenbacher if (pi->cmd == P_BITMAP) 4180e658983aSAndreas Gruenbacher err = receive_bitmap_plain(mdev, pi->size, pi->data, &c); 4181e658983aSAndreas Gruenbacher else if (pi->cmd == P_COMPRESSED_BITMAP) { 4182b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 4183b411b363SPhilipp Reisner * and the feature is enabled! */ 4184e658983aSAndreas Gruenbacher struct p_compressed_bm *p = pi->data; 4185b411b363SPhilipp Reisner 418650d0b1adSAndreas Gruenbacher if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(tconn)) { 4187b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 418882bc0194SAndreas Gruenbacher err = -EIO; 4189b411b363SPhilipp Reisner goto out; 4190b411b363SPhilipp Reisner } 4191e658983aSAndreas Gruenbacher if (pi->size <= sizeof(*p)) { 4192e2857216SAndreas Gruenbacher dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", pi->size); 419382bc0194SAndreas Gruenbacher err = -EIO; 419478fcbdaeSAndreas Gruenbacher goto out; 4195b411b363SPhilipp Reisner } 4196e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, pi->size); 4197e658983aSAndreas Gruenbacher if (err) 4198e658983aSAndreas Gruenbacher goto out; 4199e2857216SAndreas Gruenbacher err = decode_bitmap_c(mdev, p, &c, pi->size); 4200b411b363SPhilipp Reisner } else { 4201e2857216SAndreas Gruenbacher dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); 420282bc0194SAndreas Gruenbacher err = -EIO; 4203b411b363SPhilipp Reisner goto out; 4204b411b363SPhilipp Reisner } 4205b411b363SPhilipp Reisner 4206e2857216SAndreas Gruenbacher c.packets[pi->cmd == P_BITMAP]++; 420750d0b1adSAndreas Gruenbacher c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(tconn) + pi->size; 4208b411b363SPhilipp Reisner 42092c46407dSAndreas Gruenbacher if (err <= 0) { 42102c46407dSAndreas Gruenbacher if (err < 0) 42112c46407dSAndreas Gruenbacher goto out; 4212b411b363SPhilipp Reisner break; 42132c46407dSAndreas Gruenbacher } 4214e2857216SAndreas Gruenbacher err = drbd_recv_header(mdev->tconn, pi); 421582bc0194SAndreas Gruenbacher if (err) 4216b411b363SPhilipp Reisner goto out; 42172c46407dSAndreas Gruenbacher } 4218b411b363SPhilipp Reisner 4219b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 4220b411b363SPhilipp Reisner 4221b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 4222de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 4223de1f8e4aSAndreas Gruenbacher 422482bc0194SAndreas Gruenbacher err = drbd_send_bitmap(mdev); 422582bc0194SAndreas Gruenbacher if (err) 4226b411b363SPhilipp Reisner goto out; 4227b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 4228de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 4229de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 4230b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 4231b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 4232b411b363SPhilipp Reisner * other threads may have noticed network errors */ 4233b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 4234b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 4235b411b363SPhilipp Reisner } 423682bc0194SAndreas Gruenbacher err = 0; 4237b411b363SPhilipp Reisner 4238b411b363SPhilipp Reisner out: 423920ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 424082bc0194SAndreas Gruenbacher if (!err && mdev->state.conn == C_WF_BITMAP_S) 4241b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 424282bc0194SAndreas Gruenbacher return err; 4243b411b363SPhilipp Reisner } 4244b411b363SPhilipp Reisner 42454a76b161SAndreas Gruenbacher static int receive_skip(struct drbd_tconn *tconn, struct packet_info *pi) 4246b411b363SPhilipp Reisner { 42474a76b161SAndreas Gruenbacher conn_warn(tconn, "skipping unknown optional packet type %d, l: %d!\n", 4248e2857216SAndreas Gruenbacher pi->cmd, pi->size); 42492de876efSPhilipp Reisner 42504a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 42512de876efSPhilipp Reisner } 42522de876efSPhilipp Reisner 42534a76b161SAndreas Gruenbacher static int receive_UnplugRemote(struct drbd_tconn *tconn, struct packet_info *pi) 4254b411b363SPhilipp Reisner { 4255b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 4256b411b363SPhilipp Reisner * with the data requests being unplugged */ 42574a76b161SAndreas Gruenbacher drbd_tcp_quickack(tconn->data.socket); 4258b411b363SPhilipp Reisner 425982bc0194SAndreas Gruenbacher return 0; 4260b411b363SPhilipp Reisner } 4261b411b363SPhilipp Reisner 42624a76b161SAndreas Gruenbacher static int receive_out_of_sync(struct drbd_tconn *tconn, struct packet_info *pi) 426373a01a18SPhilipp Reisner { 42644a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 4265e658983aSAndreas Gruenbacher struct p_block_desc *p = pi->data; 42664a76b161SAndreas Gruenbacher 42674a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 42684a76b161SAndreas Gruenbacher if (!mdev) 42694a76b161SAndreas Gruenbacher return -EIO; 427073a01a18SPhilipp Reisner 4271f735e363SLars Ellenberg switch (mdev->state.conn) { 4272f735e363SLars Ellenberg case C_WF_SYNC_UUID: 4273f735e363SLars Ellenberg case C_WF_BITMAP_T: 4274f735e363SLars Ellenberg case C_BEHIND: 4275f735e363SLars Ellenberg break; 4276f735e363SLars Ellenberg default: 4277f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 4278f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 4279f735e363SLars Ellenberg } 4280f735e363SLars Ellenberg 428173a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 428273a01a18SPhilipp Reisner 428382bc0194SAndreas Gruenbacher return 0; 428473a01a18SPhilipp Reisner } 428573a01a18SPhilipp Reisner 428602918be2SPhilipp Reisner struct data_cmd { 428702918be2SPhilipp Reisner int expect_payload; 428802918be2SPhilipp Reisner size_t pkt_size; 42894a76b161SAndreas Gruenbacher int (*fn)(struct drbd_tconn *, struct packet_info *); 4290b411b363SPhilipp Reisner }; 4291b411b363SPhilipp Reisner 429202918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 42934a76b161SAndreas Gruenbacher [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 42944a76b161SAndreas Gruenbacher [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 42954a76b161SAndreas Gruenbacher [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 42964a76b161SAndreas Gruenbacher [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 4297e658983aSAndreas Gruenbacher [P_BITMAP] = { 1, 0, receive_bitmap } , 4298e658983aSAndreas Gruenbacher [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , 4299e658983aSAndreas Gruenbacher [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, 43004a76b161SAndreas Gruenbacher [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 43014a76b161SAndreas Gruenbacher [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 4302e658983aSAndreas Gruenbacher [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, 4303e658983aSAndreas Gruenbacher [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, 43044a76b161SAndreas Gruenbacher [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 43054a76b161SAndreas Gruenbacher [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 43064a76b161SAndreas Gruenbacher [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 43074a76b161SAndreas Gruenbacher [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 43084a76b161SAndreas Gruenbacher [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 43094a76b161SAndreas Gruenbacher [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 43104a76b161SAndreas Gruenbacher [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 43114a76b161SAndreas Gruenbacher [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 43124a76b161SAndreas Gruenbacher [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 43134a76b161SAndreas Gruenbacher [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 43144a76b161SAndreas Gruenbacher [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 43154a76b161SAndreas Gruenbacher [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, 4316036b17eaSPhilipp Reisner [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, 431702918be2SPhilipp Reisner }; 431802918be2SPhilipp Reisner 4319eefc2f7dSPhilipp Reisner static void drbdd(struct drbd_tconn *tconn) 4320b411b363SPhilipp Reisner { 432177351055SPhilipp Reisner struct packet_info pi; 432202918be2SPhilipp Reisner size_t shs; /* sub header size */ 432382bc0194SAndreas Gruenbacher int err; 4324b411b363SPhilipp Reisner 4325eefc2f7dSPhilipp Reisner while (get_t_state(&tconn->receiver) == RUNNING) { 4326deebe195SAndreas Gruenbacher struct data_cmd *cmd; 4327deebe195SAndreas Gruenbacher 4328eefc2f7dSPhilipp Reisner drbd_thread_current_set_cpu(&tconn->receiver); 432969bc7bc3SAndreas Gruenbacher if (drbd_recv_header(tconn, &pi)) 433002918be2SPhilipp Reisner goto err_out; 433102918be2SPhilipp Reisner 4332deebe195SAndreas Gruenbacher cmd = &drbd_cmd_handler[pi.cmd]; 43334a76b161SAndreas Gruenbacher if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { 43342fcb8f30SAndreas Gruenbacher conn_err(tconn, "Unexpected data packet %s (0x%04x)", 43352fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.cmd); 433602918be2SPhilipp Reisner goto err_out; 43370b33a916SLars Ellenberg } 4338b411b363SPhilipp Reisner 4339e658983aSAndreas Gruenbacher shs = cmd->pkt_size; 4340e658983aSAndreas Gruenbacher if (pi.size > shs && !cmd->expect_payload) { 43412fcb8f30SAndreas Gruenbacher conn_err(tconn, "No payload expected %s l:%d\n", 43422fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.size); 4343c13f7e1aSLars Ellenberg goto err_out; 4344c13f7e1aSLars Ellenberg } 4345c13f7e1aSLars Ellenberg 4346c13f7e1aSLars Ellenberg if (shs) { 4347e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, pi.data, shs); 4348a5c31904SAndreas Gruenbacher if (err) 434902918be2SPhilipp Reisner goto err_out; 4350e2857216SAndreas Gruenbacher pi.size -= shs; 4351b411b363SPhilipp Reisner } 435202918be2SPhilipp Reisner 43534a76b161SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 43544a76b161SAndreas Gruenbacher if (err) { 43559f5bdc33SAndreas Gruenbacher conn_err(tconn, "error receiving %s, e: %d l: %d!\n", 43569f5bdc33SAndreas Gruenbacher cmdname(pi.cmd), err, pi.size); 435702918be2SPhilipp Reisner goto err_out; 4358b411b363SPhilipp Reisner } 4359b411b363SPhilipp Reisner } 436082bc0194SAndreas Gruenbacher return; 436102918be2SPhilipp Reisner 436202918be2SPhilipp Reisner err_out: 4363bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 4364b411b363SPhilipp Reisner } 4365b411b363SPhilipp Reisner 43660e29d163SPhilipp Reisner void conn_flush_workqueue(struct drbd_tconn *tconn) 4367b411b363SPhilipp Reisner { 4368b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 4369b411b363SPhilipp Reisner 4370b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 43710e29d163SPhilipp Reisner barr.w.tconn = tconn; 4372b411b363SPhilipp Reisner init_completion(&barr.done); 43730e29d163SPhilipp Reisner drbd_queue_work(&tconn->data.work, &barr.w); 4374b411b363SPhilipp Reisner wait_for_completion(&barr.done); 4375b411b363SPhilipp Reisner } 4376b411b363SPhilipp Reisner 437781fa2e67SPhilipp Reisner static void conn_disconnect(struct drbd_tconn *tconn) 4378b411b363SPhilipp Reisner { 4379c141ebdaSPhilipp Reisner struct drbd_conf *mdev; 4380bbeb641cSPhilipp Reisner enum drbd_conns oc; 4381376694a0SPhilipp Reisner int vnr; 4382b411b363SPhilipp Reisner 4383bbeb641cSPhilipp Reisner if (tconn->cstate == C_STANDALONE) 4384b411b363SPhilipp Reisner return; 4385b411b363SPhilipp Reisner 4386b8853dbdSPhilipp Reisner /* We are about to start the cleanup after connection loss. 4387b8853dbdSPhilipp Reisner * Make sure drbd_make_request knows about that. 4388b8853dbdSPhilipp Reisner * Usually we should be in some network failure state already, 4389b8853dbdSPhilipp Reisner * but just in case we are not, we fix it up here. 4390b8853dbdSPhilipp Reisner */ 4391b8853dbdSPhilipp Reisner conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); 4392b8853dbdSPhilipp Reisner 4393b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 4394360cc740SPhilipp Reisner drbd_thread_stop(&tconn->asender); 4395360cc740SPhilipp Reisner drbd_free_sock(tconn); 4396360cc740SPhilipp Reisner 4397c141ebdaSPhilipp Reisner rcu_read_lock(); 4398c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 4399c141ebdaSPhilipp Reisner kref_get(&mdev->kref); 4400c141ebdaSPhilipp Reisner rcu_read_unlock(); 4401c141ebdaSPhilipp Reisner drbd_disconnected(mdev); 4402c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 4403c141ebdaSPhilipp Reisner rcu_read_lock(); 4404c141ebdaSPhilipp Reisner } 4405c141ebdaSPhilipp Reisner rcu_read_unlock(); 4406c141ebdaSPhilipp Reisner 440712038a3aSPhilipp Reisner if (!list_empty(&tconn->current_epoch->list)) 440812038a3aSPhilipp Reisner conn_err(tconn, "ASSERTION FAILED: tconn->current_epoch->list not empty\n"); 440912038a3aSPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 441012038a3aSPhilipp Reisner atomic_set(&tconn->current_epoch->epoch_size, 0); 441112038a3aSPhilipp Reisner 4412360cc740SPhilipp Reisner conn_info(tconn, "Connection closed\n"); 4413360cc740SPhilipp Reisner 4414cb703454SPhilipp Reisner if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN) 4415cb703454SPhilipp Reisner conn_try_outdate_peer_async(tconn); 4416cb703454SPhilipp Reisner 4417360cc740SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 4418bbeb641cSPhilipp Reisner oc = tconn->cstate; 4419bbeb641cSPhilipp Reisner if (oc >= C_UNCONNECTED) 4420376694a0SPhilipp Reisner _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); 4421bbeb641cSPhilipp Reisner 4422360cc740SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 4423360cc740SPhilipp Reisner 4424f3dfa40aSLars Ellenberg if (oc == C_DISCONNECTING) 4425d9cc6e23SLars Ellenberg conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); 4426360cc740SPhilipp Reisner } 4427360cc740SPhilipp Reisner 4428c141ebdaSPhilipp Reisner static int drbd_disconnected(struct drbd_conf *mdev) 4429360cc740SPhilipp Reisner { 4430360cc740SPhilipp Reisner unsigned int i; 4431b411b363SPhilipp Reisner 443285719573SPhilipp Reisner /* wait for current activity to cease. */ 443387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4434b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 4435b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 4436b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 443787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4438b411b363SPhilipp Reisner 4439b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 4440b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 4441b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 4442b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 4443b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 4444b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 4445b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 4446b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 4447b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 4448b411b363SPhilipp Reisner * on the fly. */ 4449b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 4450b411b363SPhilipp Reisner mdev->rs_total = 0; 4451b411b363SPhilipp Reisner mdev->rs_failed = 0; 4452b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 4453b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 4454b411b363SPhilipp Reisner 4455b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 4456b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 4457b411b363SPhilipp Reisner 4458b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 4459b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 4460b411b363SPhilipp Reisner * to be "canceled" */ 4461a21e9298SPhilipp Reisner drbd_flush_workqueue(mdev); 4462b411b363SPhilipp Reisner 4463a990be46SAndreas Gruenbacher drbd_finish_peer_reqs(mdev); 4464b411b363SPhilipp Reisner 4465d10b4ea3SPhilipp Reisner /* This second workqueue flush is necessary, since drbd_finish_peer_reqs() 4466d10b4ea3SPhilipp Reisner might have issued a work again. The one before drbd_finish_peer_reqs() is 4467d10b4ea3SPhilipp Reisner necessary to reclain net_ee in drbd_finish_peer_reqs(). */ 4468d10b4ea3SPhilipp Reisner drbd_flush_workqueue(mdev); 4469d10b4ea3SPhilipp Reisner 4470b411b363SPhilipp Reisner kfree(mdev->p_uuid); 4471b411b363SPhilipp Reisner mdev->p_uuid = NULL; 4472b411b363SPhilipp Reisner 44732aebfabbSPhilipp Reisner if (!drbd_suspended(mdev)) 44742f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 4475b411b363SPhilipp Reisner 4476b411b363SPhilipp Reisner drbd_md_sync(mdev); 4477b411b363SPhilipp Reisner 447820ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 447920ceb2b2SLars Ellenberg * if any. */ 448020ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 448120ceb2b2SLars Ellenberg 4482b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 4483b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 4484b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 4485b411b363SPhilipp Reisner * 4486b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 4487b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 4488b411b363SPhilipp Reisner */ 44897721f567SAndreas Gruenbacher i = drbd_free_peer_reqs(mdev, &mdev->net_ee); 4490b411b363SPhilipp Reisner if (i) 4491b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 4492435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 4493435f0740SLars Ellenberg if (i) 4494435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 4495b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 4496b411b363SPhilipp Reisner if (i) 449745bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 4498b411b363SPhilipp Reisner 4499b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 4500b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 4501b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 4502b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 4503b411b363SPhilipp Reisner 4504360cc740SPhilipp Reisner return 0; 4505b411b363SPhilipp Reisner } 4506b411b363SPhilipp Reisner 4507b411b363SPhilipp Reisner /* 4508b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 4509b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 4510b411b363SPhilipp Reisner * 4511b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 4512b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 4513b411b363SPhilipp Reisner * 4514b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 4515b411b363SPhilipp Reisner */ 45166038178eSAndreas Gruenbacher static int drbd_send_features(struct drbd_tconn *tconn) 4517b411b363SPhilipp Reisner { 45189f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 45199f5bdc33SAndreas Gruenbacher struct p_connection_features *p; 4520b411b363SPhilipp Reisner 45219f5bdc33SAndreas Gruenbacher sock = &tconn->data; 45229f5bdc33SAndreas Gruenbacher p = conn_prepare_command(tconn, sock); 45239f5bdc33SAndreas Gruenbacher if (!p) 4524e8d17b01SAndreas Gruenbacher return -EIO; 4525b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 4526b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 4527b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 45289f5bdc33SAndreas Gruenbacher return conn_send_command(tconn, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); 4529b411b363SPhilipp Reisner } 4530b411b363SPhilipp Reisner 4531b411b363SPhilipp Reisner /* 4532b411b363SPhilipp Reisner * return values: 4533b411b363SPhilipp Reisner * 1 yes, we have a valid connection 4534b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 4535b411b363SPhilipp Reisner * -1 peer talks different language, 4536b411b363SPhilipp Reisner * no point in trying again, please go standalone. 4537b411b363SPhilipp Reisner */ 45386038178eSAndreas Gruenbacher static int drbd_do_features(struct drbd_tconn *tconn) 4539b411b363SPhilipp Reisner { 454065d11ed6SPhilipp Reisner /* ASSERT current == tconn->receiver ... */ 4541e658983aSAndreas Gruenbacher struct p_connection_features *p; 4542e658983aSAndreas Gruenbacher const int expect = sizeof(struct p_connection_features); 454377351055SPhilipp Reisner struct packet_info pi; 4544a5c31904SAndreas Gruenbacher int err; 4545b411b363SPhilipp Reisner 45466038178eSAndreas Gruenbacher err = drbd_send_features(tconn); 4547e8d17b01SAndreas Gruenbacher if (err) 4548b411b363SPhilipp Reisner return 0; 4549b411b363SPhilipp Reisner 455069bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 455169bc7bc3SAndreas Gruenbacher if (err) 4552b411b363SPhilipp Reisner return 0; 4553b411b363SPhilipp Reisner 45546038178eSAndreas Gruenbacher if (pi.cmd != P_CONNECTION_FEATURES) { 45556038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", 455677351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4557b411b363SPhilipp Reisner return -1; 4558b411b363SPhilipp Reisner } 4559b411b363SPhilipp Reisner 456077351055SPhilipp Reisner if (pi.size != expect) { 45616038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures length: %u, received: %u\n", 456277351055SPhilipp Reisner expect, pi.size); 4563b411b363SPhilipp Reisner return -1; 4564b411b363SPhilipp Reisner } 4565b411b363SPhilipp Reisner 4566e658983aSAndreas Gruenbacher p = pi.data; 4567e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, p, expect); 4568a5c31904SAndreas Gruenbacher if (err) 4569b411b363SPhilipp Reisner return 0; 4570b411b363SPhilipp Reisner 4571b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 4572b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 4573b411b363SPhilipp Reisner if (p->protocol_max == 0) 4574b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 4575b411b363SPhilipp Reisner 4576b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 4577b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 4578b411b363SPhilipp Reisner goto incompat; 4579b411b363SPhilipp Reisner 458065d11ed6SPhilipp Reisner tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 4581b411b363SPhilipp Reisner 458265d11ed6SPhilipp Reisner conn_info(tconn, "Handshake successful: " 458365d11ed6SPhilipp Reisner "Agreed network protocol version %d\n", tconn->agreed_pro_version); 4584b411b363SPhilipp Reisner 4585b411b363SPhilipp Reisner return 1; 4586b411b363SPhilipp Reisner 4587b411b363SPhilipp Reisner incompat: 458865d11ed6SPhilipp Reisner conn_err(tconn, "incompatible DRBD dialects: " 4589b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 4590b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 4591b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 4592b411b363SPhilipp Reisner return -1; 4593b411b363SPhilipp Reisner } 4594b411b363SPhilipp Reisner 4595b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 459613e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4597b411b363SPhilipp Reisner { 4598b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 4599b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 4600b10d96cbSJohannes Thoma return -1; 4601b411b363SPhilipp Reisner } 4602b411b363SPhilipp Reisner #else 4603b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4604b10d96cbSJohannes Thoma 4605b10d96cbSJohannes Thoma /* Return value: 4606b10d96cbSJohannes Thoma 1 - auth succeeded, 4607b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4608b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4609b10d96cbSJohannes Thoma */ 4610b10d96cbSJohannes Thoma 461113e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4612b411b363SPhilipp Reisner { 46139f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 4614b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4615b411b363SPhilipp Reisner struct scatterlist sg; 4616b411b363SPhilipp Reisner char *response = NULL; 4617b411b363SPhilipp Reisner char *right_response = NULL; 4618b411b363SPhilipp Reisner char *peers_ch = NULL; 461944ed167dSPhilipp Reisner unsigned int key_len; 462044ed167dSPhilipp Reisner char secret[SHARED_SECRET_MAX]; /* 64 byte */ 4621b411b363SPhilipp Reisner unsigned int resp_size; 4622b411b363SPhilipp Reisner struct hash_desc desc; 462377351055SPhilipp Reisner struct packet_info pi; 462444ed167dSPhilipp Reisner struct net_conf *nc; 462569bc7bc3SAndreas Gruenbacher int err, rv; 4626b411b363SPhilipp Reisner 46279f5bdc33SAndreas Gruenbacher /* FIXME: Put the challenge/response into the preallocated socket buffer. */ 46289f5bdc33SAndreas Gruenbacher 462944ed167dSPhilipp Reisner rcu_read_lock(); 463044ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 463144ed167dSPhilipp Reisner key_len = strlen(nc->shared_secret); 463244ed167dSPhilipp Reisner memcpy(secret, nc->shared_secret, key_len); 463344ed167dSPhilipp Reisner rcu_read_unlock(); 463444ed167dSPhilipp Reisner 463513e6037dSPhilipp Reisner desc.tfm = tconn->cram_hmac_tfm; 4636b411b363SPhilipp Reisner desc.flags = 0; 4637b411b363SPhilipp Reisner 463844ed167dSPhilipp Reisner rv = crypto_hash_setkey(tconn->cram_hmac_tfm, (u8 *)secret, key_len); 4639b411b363SPhilipp Reisner if (rv) { 464013e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); 4641b10d96cbSJohannes Thoma rv = -1; 4642b411b363SPhilipp Reisner goto fail; 4643b411b363SPhilipp Reisner } 4644b411b363SPhilipp Reisner 4645b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4646b411b363SPhilipp Reisner 46479f5bdc33SAndreas Gruenbacher sock = &tconn->data; 46489f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 46499f5bdc33SAndreas Gruenbacher rv = 0; 46509f5bdc33SAndreas Gruenbacher goto fail; 46519f5bdc33SAndreas Gruenbacher } 4652e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_CHALLENGE, 0, 46539f5bdc33SAndreas Gruenbacher my_challenge, CHALLENGE_LEN); 4654b411b363SPhilipp Reisner if (!rv) 4655b411b363SPhilipp Reisner goto fail; 4656b411b363SPhilipp Reisner 465769bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 465869bc7bc3SAndreas Gruenbacher if (err) { 465969bc7bc3SAndreas Gruenbacher rv = 0; 4660b411b363SPhilipp Reisner goto fail; 466169bc7bc3SAndreas Gruenbacher } 4662b411b363SPhilipp Reisner 466377351055SPhilipp Reisner if (pi.cmd != P_AUTH_CHALLENGE) { 466413e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", 466577351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4666b411b363SPhilipp Reisner rv = 0; 4667b411b363SPhilipp Reisner goto fail; 4668b411b363SPhilipp Reisner } 4669b411b363SPhilipp Reisner 467077351055SPhilipp Reisner if (pi.size > CHALLENGE_LEN * 2) { 467113e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge payload too big.\n"); 4672b10d96cbSJohannes Thoma rv = -1; 4673b411b363SPhilipp Reisner goto fail; 4674b411b363SPhilipp Reisner } 4675b411b363SPhilipp Reisner 467677351055SPhilipp Reisner peers_ch = kmalloc(pi.size, GFP_NOIO); 4677b411b363SPhilipp Reisner if (peers_ch == NULL) { 467813e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of peers_ch failed\n"); 4679b10d96cbSJohannes Thoma rv = -1; 4680b411b363SPhilipp Reisner goto fail; 4681b411b363SPhilipp Reisner } 4682b411b363SPhilipp Reisner 4683a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, peers_ch, pi.size); 4684a5c31904SAndreas Gruenbacher if (err) { 4685b411b363SPhilipp Reisner rv = 0; 4686b411b363SPhilipp Reisner goto fail; 4687b411b363SPhilipp Reisner } 4688b411b363SPhilipp Reisner 468913e6037dSPhilipp Reisner resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); 4690b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4691b411b363SPhilipp Reisner if (response == NULL) { 469213e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of response failed\n"); 4693b10d96cbSJohannes Thoma rv = -1; 4694b411b363SPhilipp Reisner goto fail; 4695b411b363SPhilipp Reisner } 4696b411b363SPhilipp Reisner 4697b411b363SPhilipp Reisner sg_init_table(&sg, 1); 469877351055SPhilipp Reisner sg_set_buf(&sg, peers_ch, pi.size); 4699b411b363SPhilipp Reisner 4700b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4701b411b363SPhilipp Reisner if (rv) { 470213e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4703b10d96cbSJohannes Thoma rv = -1; 4704b411b363SPhilipp Reisner goto fail; 4705b411b363SPhilipp Reisner } 4706b411b363SPhilipp Reisner 47079f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 47089f5bdc33SAndreas Gruenbacher rv = 0; 47099f5bdc33SAndreas Gruenbacher goto fail; 47109f5bdc33SAndreas Gruenbacher } 4711e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_RESPONSE, 0, 47129f5bdc33SAndreas Gruenbacher response, resp_size); 4713b411b363SPhilipp Reisner if (!rv) 4714b411b363SPhilipp Reisner goto fail; 4715b411b363SPhilipp Reisner 471669bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 471769bc7bc3SAndreas Gruenbacher if (err) { 471869bc7bc3SAndreas Gruenbacher rv = 0; 4719b411b363SPhilipp Reisner goto fail; 472069bc7bc3SAndreas Gruenbacher } 4721b411b363SPhilipp Reisner 472277351055SPhilipp Reisner if (pi.cmd != P_AUTH_RESPONSE) { 472313e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", 472477351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4725b411b363SPhilipp Reisner rv = 0; 4726b411b363SPhilipp Reisner goto fail; 4727b411b363SPhilipp Reisner } 4728b411b363SPhilipp Reisner 472977351055SPhilipp Reisner if (pi.size != resp_size) { 473013e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse payload of wrong size\n"); 4731b411b363SPhilipp Reisner rv = 0; 4732b411b363SPhilipp Reisner goto fail; 4733b411b363SPhilipp Reisner } 4734b411b363SPhilipp Reisner 4735a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, response , resp_size); 4736a5c31904SAndreas Gruenbacher if (err) { 4737b411b363SPhilipp Reisner rv = 0; 4738b411b363SPhilipp Reisner goto fail; 4739b411b363SPhilipp Reisner } 4740b411b363SPhilipp Reisner 4741b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 47422d1ee87dSJulia Lawall if (right_response == NULL) { 474313e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of right_response failed\n"); 4744b10d96cbSJohannes Thoma rv = -1; 4745b411b363SPhilipp Reisner goto fail; 4746b411b363SPhilipp Reisner } 4747b411b363SPhilipp Reisner 4748b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4749b411b363SPhilipp Reisner 4750b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4751b411b363SPhilipp Reisner if (rv) { 475213e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4753b10d96cbSJohannes Thoma rv = -1; 4754b411b363SPhilipp Reisner goto fail; 4755b411b363SPhilipp Reisner } 4756b411b363SPhilipp Reisner 4757b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4758b411b363SPhilipp Reisner 4759b411b363SPhilipp Reisner if (rv) 476044ed167dSPhilipp Reisner conn_info(tconn, "Peer authenticated using %d bytes HMAC\n", 476144ed167dSPhilipp Reisner resp_size); 4762b10d96cbSJohannes Thoma else 4763b10d96cbSJohannes Thoma rv = -1; 4764b411b363SPhilipp Reisner 4765b411b363SPhilipp Reisner fail: 4766b411b363SPhilipp Reisner kfree(peers_ch); 4767b411b363SPhilipp Reisner kfree(response); 4768b411b363SPhilipp Reisner kfree(right_response); 4769b411b363SPhilipp Reisner 4770b411b363SPhilipp Reisner return rv; 4771b411b363SPhilipp Reisner } 4772b411b363SPhilipp Reisner #endif 4773b411b363SPhilipp Reisner 4774b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4775b411b363SPhilipp Reisner { 4776392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 4777b411b363SPhilipp Reisner int h; 4778b411b363SPhilipp Reisner 47794d641dd7SPhilipp Reisner conn_info(tconn, "receiver (re)started\n"); 4780b411b363SPhilipp Reisner 4781b411b363SPhilipp Reisner do { 478281fa2e67SPhilipp Reisner h = conn_connect(tconn); 4783b411b363SPhilipp Reisner if (h == 0) { 478481fa2e67SPhilipp Reisner conn_disconnect(tconn); 478520ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4786b411b363SPhilipp Reisner } 4787b411b363SPhilipp Reisner if (h == -1) { 47884d641dd7SPhilipp Reisner conn_warn(tconn, "Discarding network configuration.\n"); 4789bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 4790b411b363SPhilipp Reisner } 4791b411b363SPhilipp Reisner } while (h == 0); 4792b411b363SPhilipp Reisner 479391fd4dadSPhilipp Reisner if (h > 0) 47944d641dd7SPhilipp Reisner drbdd(tconn); 4795b411b363SPhilipp Reisner 479681fa2e67SPhilipp Reisner conn_disconnect(tconn); 4797b411b363SPhilipp Reisner 47984d641dd7SPhilipp Reisner conn_info(tconn, "receiver terminated\n"); 4799b411b363SPhilipp Reisner return 0; 4800b411b363SPhilipp Reisner } 4801b411b363SPhilipp Reisner 4802b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4803b411b363SPhilipp Reisner 4804e05e1e59SAndreas Gruenbacher static int got_conn_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4805b411b363SPhilipp Reisner { 4806e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4807b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4808b411b363SPhilipp Reisner 4809fc3b10a4SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4810fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags); 4811fc3b10a4SPhilipp Reisner } else { 4812fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags); 4813fc3b10a4SPhilipp Reisner conn_err(tconn, "Requested state change failed by peer: %s (%d)\n", 4814fc3b10a4SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4815fc3b10a4SPhilipp Reisner } 4816fc3b10a4SPhilipp Reisner wake_up(&tconn->ping_wait); 4817e4f78edeSPhilipp Reisner 48182735a594SAndreas Gruenbacher return 0; 4819fc3b10a4SPhilipp Reisner } 4820e4f78edeSPhilipp Reisner 48211952e916SAndreas Gruenbacher static int got_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4822e4f78edeSPhilipp Reisner { 48231952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4824e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4825e4f78edeSPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4826e4f78edeSPhilipp Reisner 48271952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48281952e916SAndreas Gruenbacher if (!mdev) 48292735a594SAndreas Gruenbacher return -EIO; 48301952e916SAndreas Gruenbacher 48314d0fc3fdSPhilipp Reisner if (test_bit(CONN_WD_ST_CHG_REQ, &tconn->flags)) { 48324d0fc3fdSPhilipp Reisner D_ASSERT(tconn->agreed_pro_version < 100); 48334d0fc3fdSPhilipp Reisner return got_conn_RqSReply(tconn, pi); 48344d0fc3fdSPhilipp Reisner } 48354d0fc3fdSPhilipp Reisner 4836e4f78edeSPhilipp Reisner if (retcode >= SS_SUCCESS) { 4837e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4838e4f78edeSPhilipp Reisner } else { 4839e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4840e4f78edeSPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4841e4f78edeSPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4842e4f78edeSPhilipp Reisner } 4843e4f78edeSPhilipp Reisner wake_up(&mdev->state_wait); 4844e4f78edeSPhilipp Reisner 48452735a594SAndreas Gruenbacher return 0; 4846b411b363SPhilipp Reisner } 4847b411b363SPhilipp Reisner 4848e05e1e59SAndreas Gruenbacher static int got_Ping(struct drbd_tconn *tconn, struct packet_info *pi) 4849b411b363SPhilipp Reisner { 48502735a594SAndreas Gruenbacher return drbd_send_ping_ack(tconn); 4851b411b363SPhilipp Reisner 4852b411b363SPhilipp Reisner } 4853b411b363SPhilipp Reisner 4854e05e1e59SAndreas Gruenbacher static int got_PingAck(struct drbd_tconn *tconn, struct packet_info *pi) 4855b411b363SPhilipp Reisner { 4856b411b363SPhilipp Reisner /* restore idle timeout */ 48572a67d8b9SPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; 48582a67d8b9SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) 48592a67d8b9SPhilipp Reisner wake_up(&tconn->ping_wait); 4860b411b363SPhilipp Reisner 48612735a594SAndreas Gruenbacher return 0; 4862b411b363SPhilipp Reisner } 4863b411b363SPhilipp Reisner 48641952e916SAndreas Gruenbacher static int got_IsInSync(struct drbd_tconn *tconn, struct packet_info *pi) 4865b411b363SPhilipp Reisner { 48661952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4867e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4868b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4869b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4870b411b363SPhilipp Reisner 48711952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48721952e916SAndreas Gruenbacher if (!mdev) 48732735a594SAndreas Gruenbacher return -EIO; 48741952e916SAndreas Gruenbacher 487531890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 4876b411b363SPhilipp Reisner 4877b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4878b411b363SPhilipp Reisner 48791d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4880b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4881b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4882b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4883b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 48841d53f09eSLars Ellenberg put_ldev(mdev); 48851d53f09eSLars Ellenberg } 4886b411b363SPhilipp Reisner dec_rs_pending(mdev); 4887778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4888b411b363SPhilipp Reisner 48892735a594SAndreas Gruenbacher return 0; 4890b411b363SPhilipp Reisner } 4891b411b363SPhilipp Reisner 4892bc9c5c41SAndreas Gruenbacher static int 4893bc9c5c41SAndreas Gruenbacher validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, 4894bc9c5c41SAndreas Gruenbacher struct rb_root *root, const char *func, 4895bc9c5c41SAndreas Gruenbacher enum drbd_req_event what, bool missing_ok) 4896b411b363SPhilipp Reisner { 4897b411b363SPhilipp Reisner struct drbd_request *req; 4898b411b363SPhilipp Reisner struct bio_and_error m; 4899b411b363SPhilipp Reisner 490087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4901bc9c5c41SAndreas Gruenbacher req = find_request(mdev, root, id, sector, missing_ok, func); 4902b411b363SPhilipp Reisner if (unlikely(!req)) { 490387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 490485997675SAndreas Gruenbacher return -EIO; 4905b411b363SPhilipp Reisner } 4906b411b363SPhilipp Reisner __req_mod(req, what, &m); 490787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4908b411b363SPhilipp Reisner 4909b411b363SPhilipp Reisner if (m.bio) 4910b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 491185997675SAndreas Gruenbacher return 0; 4912b411b363SPhilipp Reisner } 4913b411b363SPhilipp Reisner 49141952e916SAndreas Gruenbacher static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi) 4915b411b363SPhilipp Reisner { 49161952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4917e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4918b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4919b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4920b411b363SPhilipp Reisner enum drbd_req_event what; 4921b411b363SPhilipp Reisner 49221952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49231952e916SAndreas Gruenbacher if (!mdev) 49242735a594SAndreas Gruenbacher return -EIO; 49251952e916SAndreas Gruenbacher 4926b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4927b411b363SPhilipp Reisner 4928579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4929b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4930b411b363SPhilipp Reisner dec_rs_pending(mdev); 49312735a594SAndreas Gruenbacher return 0; 4932b411b363SPhilipp Reisner } 4933e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 4934b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 49358554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER_AND_SIS; 4936b411b363SPhilipp Reisner break; 4937b411b363SPhilipp Reisner case P_WRITE_ACK: 49388554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER; 4939b411b363SPhilipp Reisner break; 4940b411b363SPhilipp Reisner case P_RECV_ACK: 49418554df1cSAndreas Gruenbacher what = RECV_ACKED_BY_PEER; 4942b411b363SPhilipp Reisner break; 49437be8da07SAndreas Gruenbacher case P_DISCARD_WRITE: 49447be8da07SAndreas Gruenbacher what = DISCARD_WRITE; 49457be8da07SAndreas Gruenbacher break; 49467be8da07SAndreas Gruenbacher case P_RETRY_WRITE: 49477be8da07SAndreas Gruenbacher what = POSTPONE_WRITE; 4948b411b363SPhilipp Reisner break; 4949b411b363SPhilipp Reisner default: 49502735a594SAndreas Gruenbacher BUG(); 4951b411b363SPhilipp Reisner } 4952b411b363SPhilipp Reisner 49532735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 4954bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4955bc9c5c41SAndreas Gruenbacher what, false); 4956b411b363SPhilipp Reisner } 4957b411b363SPhilipp Reisner 49581952e916SAndreas Gruenbacher static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi) 4959b411b363SPhilipp Reisner { 49601952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4961e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4962b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 49632deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 496485997675SAndreas Gruenbacher int err; 4965b411b363SPhilipp Reisner 49661952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49671952e916SAndreas Gruenbacher if (!mdev) 49682735a594SAndreas Gruenbacher return -EIO; 49691952e916SAndreas Gruenbacher 4970b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4971b411b363SPhilipp Reisner 4972579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4973b411b363SPhilipp Reisner dec_rs_pending(mdev); 4974b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 49752735a594SAndreas Gruenbacher return 0; 4976b411b363SPhilipp Reisner } 49772deb8336SPhilipp Reisner 497885997675SAndreas Gruenbacher err = validate_req_change_req_state(mdev, p->block_id, sector, 4979bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4980303d1448SPhilipp Reisner NEG_ACKED, true); 498185997675SAndreas Gruenbacher if (err) { 49822deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 49832deb8336SPhilipp Reisner The master bio might already be completed, therefore the 4984c3afd8f5SAndreas Gruenbacher request is no longer in the collision hash. */ 49852deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 49862deb8336SPhilipp Reisner but then get a P_NEG_ACK afterwards. */ 4987c3afd8f5SAndreas Gruenbacher drbd_set_out_of_sync(mdev, sector, size); 49882deb8336SPhilipp Reisner } 49892735a594SAndreas Gruenbacher return 0; 4990b411b363SPhilipp Reisner } 4991b411b363SPhilipp Reisner 49921952e916SAndreas Gruenbacher static int got_NegDReply(struct drbd_tconn *tconn, struct packet_info *pi) 4993b411b363SPhilipp Reisner { 49941952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4995e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4996b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4997b411b363SPhilipp Reisner 49981952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49991952e916SAndreas Gruenbacher if (!mdev) 50002735a594SAndreas Gruenbacher return -EIO; 50011952e916SAndreas Gruenbacher 5002b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 50037be8da07SAndreas Gruenbacher 5004380207d0SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u.\n", 5005b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 5006b411b363SPhilipp Reisner 50072735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 5008bc9c5c41SAndreas Gruenbacher &mdev->read_requests, __func__, 50098554df1cSAndreas Gruenbacher NEG_ACKED, false); 5010b411b363SPhilipp Reisner } 5011b411b363SPhilipp Reisner 50121952e916SAndreas Gruenbacher static int got_NegRSDReply(struct drbd_tconn *tconn, struct packet_info *pi) 5013b411b363SPhilipp Reisner { 50141952e916SAndreas Gruenbacher struct drbd_conf *mdev; 5015b411b363SPhilipp Reisner sector_t sector; 5016b411b363SPhilipp Reisner int size; 5017e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 50181952e916SAndreas Gruenbacher 50191952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 50201952e916SAndreas Gruenbacher if (!mdev) 50212735a594SAndreas Gruenbacher return -EIO; 5022b411b363SPhilipp Reisner 5023b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 5024b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 5025b411b363SPhilipp Reisner 5026b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 5027b411b363SPhilipp Reisner 5028b411b363SPhilipp Reisner dec_rs_pending(mdev); 5029b411b363SPhilipp Reisner 5030b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 5031b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 5032e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 5033d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 5034b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 5035d612d309SPhilipp Reisner case P_RS_CANCEL: 5036d612d309SPhilipp Reisner break; 5037d612d309SPhilipp Reisner default: 50382735a594SAndreas Gruenbacher BUG(); 5039d612d309SPhilipp Reisner } 5040b411b363SPhilipp Reisner put_ldev(mdev); 5041b411b363SPhilipp Reisner } 5042b411b363SPhilipp Reisner 50432735a594SAndreas Gruenbacher return 0; 5044b411b363SPhilipp Reisner } 5045b411b363SPhilipp Reisner 50461952e916SAndreas Gruenbacher static int got_BarrierAck(struct drbd_tconn *tconn, struct packet_info *pi) 5047b411b363SPhilipp Reisner { 50481952e916SAndreas Gruenbacher struct drbd_conf *mdev; 5049e658983aSAndreas Gruenbacher struct p_barrier_ack *p = pi->data; 50501952e916SAndreas Gruenbacher 50511952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 50521952e916SAndreas Gruenbacher if (!mdev) 50532735a594SAndreas Gruenbacher return -EIO; 5054b411b363SPhilipp Reisner 50552f5cdd0bSPhilipp Reisner tl_release(mdev->tconn, p->barrier, be32_to_cpu(p->set_size)); 5056b411b363SPhilipp Reisner 5057c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 5058c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 505936baf611SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->flags)) { 5060370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 5061370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 5062c4752ef1SPhilipp Reisner } 5063c4752ef1SPhilipp Reisner 50642735a594SAndreas Gruenbacher return 0; 5065b411b363SPhilipp Reisner } 5066b411b363SPhilipp Reisner 50671952e916SAndreas Gruenbacher static int got_OVResult(struct drbd_tconn *tconn, struct packet_info *pi) 5068b411b363SPhilipp Reisner { 50691952e916SAndreas Gruenbacher struct drbd_conf *mdev; 5070e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 5071b411b363SPhilipp Reisner struct drbd_work *w; 5072b411b363SPhilipp Reisner sector_t sector; 5073b411b363SPhilipp Reisner int size; 5074b411b363SPhilipp Reisner 50751952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 50761952e916SAndreas Gruenbacher if (!mdev) 50772735a594SAndreas Gruenbacher return -EIO; 50781952e916SAndreas Gruenbacher 5079b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 5080b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 5081b411b363SPhilipp Reisner 5082b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 5083b411b363SPhilipp Reisner 5084b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 50858f7bed77SAndreas Gruenbacher drbd_ov_out_of_sync_found(mdev, sector, size); 5086b411b363SPhilipp Reisner else 50878f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 5088b411b363SPhilipp Reisner 50891d53f09eSLars Ellenberg if (!get_ldev(mdev)) 50902735a594SAndreas Gruenbacher return 0; 50911d53f09eSLars Ellenberg 5092b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 5093b411b363SPhilipp Reisner dec_rs_pending(mdev); 5094b411b363SPhilipp Reisner 5095ea5442afSLars Ellenberg --mdev->ov_left; 5096ea5442afSLars Ellenberg 5097ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 5098ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 5099ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 5100ea5442afSLars Ellenberg 5101ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 5102b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 5103b411b363SPhilipp Reisner if (w) { 5104b411b363SPhilipp Reisner w->cb = w_ov_finished; 5105a21e9298SPhilipp Reisner w->mdev = mdev; 5106e42325a5SPhilipp Reisner drbd_queue_work_front(&mdev->tconn->data.work, w); 5107b411b363SPhilipp Reisner } else { 5108b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 51098f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 5110b411b363SPhilipp Reisner drbd_resync_finished(mdev); 5111b411b363SPhilipp Reisner } 5112b411b363SPhilipp Reisner } 51131d53f09eSLars Ellenberg put_ldev(mdev); 51142735a594SAndreas Gruenbacher return 0; 5115b411b363SPhilipp Reisner } 5116b411b363SPhilipp Reisner 51171952e916SAndreas Gruenbacher static int got_skip(struct drbd_tconn *tconn, struct packet_info *pi) 51180ced55a3SPhilipp Reisner { 51192735a594SAndreas Gruenbacher return 0; 51200ced55a3SPhilipp Reisner } 51210ced55a3SPhilipp Reisner 5122a990be46SAndreas Gruenbacher static int tconn_finish_peer_reqs(struct drbd_tconn *tconn) 512332862ec7SPhilipp Reisner { 5124082a3439SPhilipp Reisner struct drbd_conf *mdev; 5125c141ebdaSPhilipp Reisner int vnr, not_empty = 0; 512632862ec7SPhilipp Reisner 512732862ec7SPhilipp Reisner do { 512832862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 512932862ec7SPhilipp Reisner flush_signals(current); 5130c141ebdaSPhilipp Reisner 5131c141ebdaSPhilipp Reisner rcu_read_lock(); 5132c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 5133c141ebdaSPhilipp Reisner kref_get(&mdev->kref); 5134c141ebdaSPhilipp Reisner rcu_read_unlock(); 5135d3fcb490SPhilipp Reisner if (drbd_finish_peer_reqs(mdev)) { 5136c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 5137c141ebdaSPhilipp Reisner return 1; 5138082a3439SPhilipp Reisner } 5139c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 5140c141ebdaSPhilipp Reisner rcu_read_lock(); 5141d3fcb490SPhilipp Reisner } 514232862ec7SPhilipp Reisner set_bit(SIGNAL_ASENDER, &tconn->flags); 5143082a3439SPhilipp Reisner 5144082a3439SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 5145c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 5146082a3439SPhilipp Reisner not_empty = !list_empty(&mdev->done_ee); 5147082a3439SPhilipp Reisner if (not_empty) 5148082a3439SPhilipp Reisner break; 5149082a3439SPhilipp Reisner } 5150082a3439SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 5151c141ebdaSPhilipp Reisner rcu_read_unlock(); 515232862ec7SPhilipp Reisner } while (not_empty); 515332862ec7SPhilipp Reisner 515432862ec7SPhilipp Reisner return 0; 515532862ec7SPhilipp Reisner } 515632862ec7SPhilipp Reisner 51577201b972SAndreas Gruenbacher struct asender_cmd { 51587201b972SAndreas Gruenbacher size_t pkt_size; 51591952e916SAndreas Gruenbacher int (*fn)(struct drbd_tconn *tconn, struct packet_info *); 51607201b972SAndreas Gruenbacher }; 51617201b972SAndreas Gruenbacher 51627201b972SAndreas Gruenbacher static struct asender_cmd asender_tbl[] = { 5163e658983aSAndreas Gruenbacher [P_PING] = { 0, got_Ping }, 5164e658983aSAndreas Gruenbacher [P_PING_ACK] = { 0, got_PingAck }, 51651952e916SAndreas Gruenbacher [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 51661952e916SAndreas Gruenbacher [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 51671952e916SAndreas Gruenbacher [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 51681952e916SAndreas Gruenbacher [P_DISCARD_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 51691952e916SAndreas Gruenbacher [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 51701952e916SAndreas Gruenbacher [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 51711952e916SAndreas Gruenbacher [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, 51721952e916SAndreas Gruenbacher [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 51731952e916SAndreas Gruenbacher [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 51741952e916SAndreas Gruenbacher [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 51751952e916SAndreas Gruenbacher [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 51761952e916SAndreas Gruenbacher [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 51771952e916SAndreas Gruenbacher [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, 51781952e916SAndreas Gruenbacher [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, 51791952e916SAndreas Gruenbacher [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 51807201b972SAndreas Gruenbacher }; 51817201b972SAndreas Gruenbacher 5182b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 5183b411b363SPhilipp Reisner { 5184392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 5185b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 518677351055SPhilipp Reisner struct packet_info pi; 5187257d0af6SPhilipp Reisner int rv; 5188e658983aSAndreas Gruenbacher void *buf = tconn->meta.rbuf; 5189b411b363SPhilipp Reisner int received = 0; 519052b061a4SAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 519152b061a4SAndreas Gruenbacher int expect = header_size; 519244ed167dSPhilipp Reisner bool ping_timeout_active = false; 519344ed167dSPhilipp Reisner struct net_conf *nc; 5194bb77d34eSAndreas Gruenbacher int ping_timeo, tcp_cork, ping_int; 5195b411b363SPhilipp Reisner 5196b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 5197b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 5198b411b363SPhilipp Reisner 5199e77a0a5cSAndreas Gruenbacher while (get_t_state(thi) == RUNNING) { 520080822284SPhilipp Reisner drbd_thread_current_set_cpu(thi); 520144ed167dSPhilipp Reisner 520244ed167dSPhilipp Reisner rcu_read_lock(); 520344ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 520444ed167dSPhilipp Reisner ping_timeo = nc->ping_timeo; 5205bb77d34eSAndreas Gruenbacher tcp_cork = nc->tcp_cork; 520644ed167dSPhilipp Reisner ping_int = nc->ping_int; 520744ed167dSPhilipp Reisner rcu_read_unlock(); 520844ed167dSPhilipp Reisner 520932862ec7SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &tconn->flags)) { 5210a17647aaSAndreas Gruenbacher if (drbd_send_ping(tconn)) { 521132862ec7SPhilipp Reisner conn_err(tconn, "drbd_send_ping has failed\n"); 5212841ce241SAndreas Gruenbacher goto reconnect; 5213841ce241SAndreas Gruenbacher } 521444ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_timeo * HZ / 10; 521544ed167dSPhilipp Reisner ping_timeout_active = true; 5216b411b363SPhilipp Reisner } 5217b411b363SPhilipp Reisner 521832862ec7SPhilipp Reisner /* TODO: conditionally cork; it may hurt latency if we cork without 521932862ec7SPhilipp Reisner much to send */ 5220bb77d34eSAndreas Gruenbacher if (tcp_cork) 522132862ec7SPhilipp Reisner drbd_tcp_cork(tconn->meta.socket); 5222a990be46SAndreas Gruenbacher if (tconn_finish_peer_reqs(tconn)) { 5223a990be46SAndreas Gruenbacher conn_err(tconn, "tconn_finish_peer_reqs() failed\n"); 5224b411b363SPhilipp Reisner goto reconnect; 5225082a3439SPhilipp Reisner } 5226b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 5227bb77d34eSAndreas Gruenbacher if (tcp_cork) 522832862ec7SPhilipp Reisner drbd_tcp_uncork(tconn->meta.socket); 5229b411b363SPhilipp Reisner 5230b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 5231b411b363SPhilipp Reisner if (signal_pending(current)) 5232b411b363SPhilipp Reisner continue; 5233b411b363SPhilipp Reisner 523432862ec7SPhilipp Reisner rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); 523532862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5236b411b363SPhilipp Reisner 5237b411b363SPhilipp Reisner flush_signals(current); 5238b411b363SPhilipp Reisner 5239b411b363SPhilipp Reisner /* Note: 5240b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 5241b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 5242b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 5243b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 5244b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 5245b411b363SPhilipp Reisner * rv == expected: full header or command 5246b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 5247b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 5248b411b363SPhilipp Reisner */ 5249b411b363SPhilipp Reisner if (likely(rv > 0)) { 5250b411b363SPhilipp Reisner received += rv; 5251b411b363SPhilipp Reisner buf += rv; 5252b411b363SPhilipp Reisner } else if (rv == 0) { 525332862ec7SPhilipp Reisner conn_err(tconn, "meta connection shut down by peer.\n"); 5254b411b363SPhilipp Reisner goto reconnect; 5255b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 5256cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 5257cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 525832862ec7SPhilipp Reisner if (time_after(tconn->last_received, 525932862ec7SPhilipp Reisner jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) 5260cb6518cbSLars Ellenberg continue; 5261f36af18cSLars Ellenberg if (ping_timeout_active) { 526232862ec7SPhilipp Reisner conn_err(tconn, "PingAck did not arrive in time.\n"); 5263b411b363SPhilipp Reisner goto reconnect; 5264b411b363SPhilipp Reisner } 526532862ec7SPhilipp Reisner set_bit(SEND_PING, &tconn->flags); 5266b411b363SPhilipp Reisner continue; 5267b411b363SPhilipp Reisner } else if (rv == -EINTR) { 5268b411b363SPhilipp Reisner continue; 5269b411b363SPhilipp Reisner } else { 527032862ec7SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 5271b411b363SPhilipp Reisner goto reconnect; 5272b411b363SPhilipp Reisner } 5273b411b363SPhilipp Reisner 5274b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 5275e658983aSAndreas Gruenbacher if (decode_header(tconn, tconn->meta.rbuf, &pi)) 5276b411b363SPhilipp Reisner goto reconnect; 52777201b972SAndreas Gruenbacher cmd = &asender_tbl[pi.cmd]; 52781952e916SAndreas Gruenbacher if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) { 52792fcb8f30SAndreas Gruenbacher conn_err(tconn, "Unexpected meta packet %s (0x%04x)\n", 52802fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.cmd); 5281b411b363SPhilipp Reisner goto disconnect; 5282b411b363SPhilipp Reisner } 5283e658983aSAndreas Gruenbacher expect = header_size + cmd->pkt_size; 528452b061a4SAndreas Gruenbacher if (pi.size != expect - header_size) { 528532862ec7SPhilipp Reisner conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", 528677351055SPhilipp Reisner pi.cmd, pi.size); 5287b411b363SPhilipp Reisner goto reconnect; 5288b411b363SPhilipp Reisner } 5289257d0af6SPhilipp Reisner } 5290b411b363SPhilipp Reisner if (received == expect) { 52912735a594SAndreas Gruenbacher bool err; 5292a4fbda8eSPhilipp Reisner 52932735a594SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 52942735a594SAndreas Gruenbacher if (err) { 52951952e916SAndreas Gruenbacher conn_err(tconn, "%pf failed\n", cmd->fn); 5296b411b363SPhilipp Reisner goto reconnect; 52971952e916SAndreas Gruenbacher } 5298b411b363SPhilipp Reisner 5299a4fbda8eSPhilipp Reisner tconn->last_received = jiffies; 5300a4fbda8eSPhilipp Reisner 530144ed167dSPhilipp Reisner if (cmd == &asender_tbl[P_PING_ACK]) { 530244ed167dSPhilipp Reisner /* restore idle timeout */ 530344ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_int * HZ; 530444ed167dSPhilipp Reisner ping_timeout_active = false; 530544ed167dSPhilipp Reisner } 5306f36af18cSLars Ellenberg 5307e658983aSAndreas Gruenbacher buf = tconn->meta.rbuf; 5308b411b363SPhilipp Reisner received = 0; 530952b061a4SAndreas Gruenbacher expect = header_size; 5310b411b363SPhilipp Reisner cmd = NULL; 5311b411b363SPhilipp Reisner } 5312b411b363SPhilipp Reisner } 5313b411b363SPhilipp Reisner 5314b411b363SPhilipp Reisner if (0) { 5315b411b363SPhilipp Reisner reconnect: 5316bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); 5317b411b363SPhilipp Reisner } 5318b411b363SPhilipp Reisner if (0) { 5319b411b363SPhilipp Reisner disconnect: 5320bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 5321b411b363SPhilipp Reisner } 532232862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5323b411b363SPhilipp Reisner 532432862ec7SPhilipp Reisner conn_info(tconn, "asender terminated\n"); 5325b411b363SPhilipp Reisner 5326b411b363SPhilipp Reisner return 0; 5327b411b363SPhilipp Reisner } 5328