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); 11729ed57dcbSLars Ellenberg drbd_send_b_ack(epoch->tconn, epoch->barrier_nr, epoch_size); 117312038a3aSPhilipp Reisner spin_lock(&tconn->epoch_lock); 1174b411b363SPhilipp Reisner } 11759ed57dcbSLars Ellenberg #if 0 11769ed57dcbSLars Ellenberg /* FIXME: dec unacked on connection, once we have 11779ed57dcbSLars Ellenberg * something to count pending connection packets in. */ 117885d73513SPhilipp Reisner if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) 11799ed57dcbSLars Ellenberg dec_unacked(epoch->tconn); 11809ed57dcbSLars Ellenberg #endif 1181b411b363SPhilipp Reisner 118212038a3aSPhilipp Reisner if (tconn->current_epoch != epoch) { 1183b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1184b411b363SPhilipp Reisner list_del(&epoch->list); 1185b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 118612038a3aSPhilipp Reisner tconn->epochs--; 1187b411b363SPhilipp Reisner kfree(epoch); 1188b411b363SPhilipp Reisner 1189b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1190b411b363SPhilipp Reisner rv = FE_DESTROYED; 1191b411b363SPhilipp Reisner } else { 1192b411b363SPhilipp Reisner epoch->flags = 0; 1193b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1194698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1195b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1196b411b363SPhilipp Reisner rv = FE_RECYCLED; 1197b411b363SPhilipp Reisner } 1198b411b363SPhilipp Reisner } 1199b411b363SPhilipp Reisner 1200b411b363SPhilipp Reisner if (!next_epoch) 1201b411b363SPhilipp Reisner break; 1202b411b363SPhilipp Reisner 1203b411b363SPhilipp Reisner epoch = next_epoch; 1204b411b363SPhilipp Reisner } while (1); 1205b411b363SPhilipp Reisner 120612038a3aSPhilipp Reisner spin_unlock(&tconn->epoch_lock); 1207b411b363SPhilipp Reisner 1208b411b363SPhilipp Reisner return rv; 1209b411b363SPhilipp Reisner } 1210b411b363SPhilipp Reisner 1211b411b363SPhilipp Reisner /** 1212b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 12134b0007c0SPhilipp Reisner * @tconn: DRBD connection. 1214b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1215b411b363SPhilipp Reisner */ 12164b0007c0SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_tconn *tconn, enum write_ordering_e wo) 1217b411b363SPhilipp Reisner { 1218daeda1ccSPhilipp Reisner struct disk_conf *dc; 12194b0007c0SPhilipp Reisner struct drbd_conf *mdev; 1220b411b363SPhilipp Reisner enum write_ordering_e pwo; 12214b0007c0SPhilipp Reisner int vnr; 1222b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1223b411b363SPhilipp Reisner [WO_none] = "none", 1224b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1225b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1226b411b363SPhilipp Reisner }; 1227b411b363SPhilipp Reisner 12284b0007c0SPhilipp Reisner pwo = tconn->write_ordering; 1229b411b363SPhilipp Reisner wo = min(pwo, wo); 1230daeda1ccSPhilipp Reisner rcu_read_lock(); 12314b0007c0SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 12324b0007c0SPhilipp Reisner if (!get_ldev(mdev)) 12334b0007c0SPhilipp Reisner continue; 1234daeda1ccSPhilipp Reisner dc = rcu_dereference(mdev->ldev->disk_conf); 1235daeda1ccSPhilipp Reisner 123666b2f6b9SAndreas Gruenbacher if (wo == WO_bdev_flush && !dc->disk_flushes) 1237b411b363SPhilipp Reisner wo = WO_drain_io; 1238d0c980e2SAndreas Gruenbacher if (wo == WO_drain_io && !dc->disk_drain) 1239b411b363SPhilipp Reisner wo = WO_none; 12404b0007c0SPhilipp Reisner put_ldev(mdev); 12414b0007c0SPhilipp Reisner } 1242daeda1ccSPhilipp Reisner rcu_read_unlock(); 12434b0007c0SPhilipp Reisner tconn->write_ordering = wo; 12444b0007c0SPhilipp Reisner if (pwo != tconn->write_ordering || wo == WO_bdev_flush) 12454b0007c0SPhilipp Reisner conn_info(tconn, "Method to ensure write ordering: %s\n", write_ordering_str[tconn->write_ordering]); 1246b411b363SPhilipp Reisner } 1247b411b363SPhilipp Reisner 1248b411b363SPhilipp Reisner /** 1249fbe29decSAndreas Gruenbacher * drbd_submit_peer_request() 125045bb912bSLars Ellenberg * @mdev: DRBD device. 1251db830c46SAndreas Gruenbacher * @peer_req: peer request 125245bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 125310f6d992SLars Ellenberg * 125410f6d992SLars Ellenberg * May spread the pages to multiple bios, 125510f6d992SLars Ellenberg * depending on bio_add_page restrictions. 125610f6d992SLars Ellenberg * 125710f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 125810f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 125910f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 126010f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 126110f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 126210f6d992SLars Ellenberg * on certain Xen deployments. 126345bb912bSLars Ellenberg */ 126445bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 1265fbe29decSAndreas Gruenbacher int drbd_submit_peer_request(struct drbd_conf *mdev, 1266fbe29decSAndreas Gruenbacher struct drbd_peer_request *peer_req, 126745bb912bSLars Ellenberg const unsigned rw, const int fault_type) 126845bb912bSLars Ellenberg { 126945bb912bSLars Ellenberg struct bio *bios = NULL; 127045bb912bSLars Ellenberg struct bio *bio; 1271db830c46SAndreas Gruenbacher struct page *page = peer_req->pages; 1272db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1273db830c46SAndreas Gruenbacher unsigned ds = peer_req->i.size; 127445bb912bSLars Ellenberg unsigned n_bios = 0; 127545bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 127610f6d992SLars Ellenberg int err = -ENOMEM; 127745bb912bSLars Ellenberg 127845bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 127945bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 128045bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 1281da4a75d2SLars Ellenberg * request in more than one bio. 1282da4a75d2SLars Ellenberg * 1283da4a75d2SLars Ellenberg * Plain bio_alloc is good enough here, this is no DRBD internally 1284da4a75d2SLars Ellenberg * generated bio, but a bio allocated on behalf of the peer. 1285da4a75d2SLars Ellenberg */ 128645bb912bSLars Ellenberg next_bio: 128745bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 128845bb912bSLars Ellenberg if (!bio) { 128945bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 129045bb912bSLars Ellenberg goto fail; 129145bb912bSLars Ellenberg } 1292db830c46SAndreas Gruenbacher /* > peer_req->i.sector, unless this is the first bio */ 129345bb912bSLars Ellenberg bio->bi_sector = sector; 129445bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 129545bb912bSLars Ellenberg bio->bi_rw = rw; 1296db830c46SAndreas Gruenbacher bio->bi_private = peer_req; 1297fcefa62eSAndreas Gruenbacher bio->bi_end_io = drbd_peer_request_endio; 129845bb912bSLars Ellenberg 129945bb912bSLars Ellenberg bio->bi_next = bios; 130045bb912bSLars Ellenberg bios = bio; 130145bb912bSLars Ellenberg ++n_bios; 130245bb912bSLars Ellenberg 130345bb912bSLars Ellenberg page_chain_for_each(page) { 130445bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 130545bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 130610f6d992SLars Ellenberg /* A single page must always be possible! 130710f6d992SLars Ellenberg * But in case it fails anyways, 130810f6d992SLars Ellenberg * we deal with it, and complain (below). */ 130910f6d992SLars Ellenberg if (bio->bi_vcnt == 0) { 131010f6d992SLars Ellenberg dev_err(DEV, 131110f6d992SLars Ellenberg "bio_add_page failed for len=%u, " 131210f6d992SLars Ellenberg "bi_vcnt=0 (bi_sector=%llu)\n", 131310f6d992SLars Ellenberg len, (unsigned long long)bio->bi_sector); 131410f6d992SLars Ellenberg err = -ENOSPC; 131510f6d992SLars Ellenberg goto fail; 131610f6d992SLars Ellenberg } 131745bb912bSLars Ellenberg goto next_bio; 131845bb912bSLars Ellenberg } 131945bb912bSLars Ellenberg ds -= len; 132045bb912bSLars Ellenberg sector += len >> 9; 132145bb912bSLars Ellenberg --nr_pages; 132245bb912bSLars Ellenberg } 132345bb912bSLars Ellenberg D_ASSERT(page == NULL); 132445bb912bSLars Ellenberg D_ASSERT(ds == 0); 132545bb912bSLars Ellenberg 1326db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, n_bios); 132745bb912bSLars Ellenberg do { 132845bb912bSLars Ellenberg bio = bios; 132945bb912bSLars Ellenberg bios = bios->bi_next; 133045bb912bSLars Ellenberg bio->bi_next = NULL; 133145bb912bSLars Ellenberg 133245bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 133345bb912bSLars Ellenberg } while (bios); 133445bb912bSLars Ellenberg return 0; 133545bb912bSLars Ellenberg 133645bb912bSLars Ellenberg fail: 133745bb912bSLars Ellenberg while (bios) { 133845bb912bSLars Ellenberg bio = bios; 133945bb912bSLars Ellenberg bios = bios->bi_next; 134045bb912bSLars Ellenberg bio_put(bio); 134145bb912bSLars Ellenberg } 134210f6d992SLars Ellenberg return err; 134345bb912bSLars Ellenberg } 134445bb912bSLars Ellenberg 134553840641SAndreas Gruenbacher static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, 1346db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req) 134753840641SAndreas Gruenbacher { 1348db830c46SAndreas Gruenbacher struct drbd_interval *i = &peer_req->i; 134953840641SAndreas Gruenbacher 135053840641SAndreas Gruenbacher drbd_remove_interval(&mdev->write_requests, i); 135153840641SAndreas Gruenbacher drbd_clear_interval(i); 135253840641SAndreas Gruenbacher 13536c852becSAndreas Gruenbacher /* Wake up any processes waiting for this peer request to complete. */ 135453840641SAndreas Gruenbacher if (i->waiting) 135553840641SAndreas Gruenbacher wake_up(&mdev->misc_wait); 135653840641SAndreas Gruenbacher } 135753840641SAndreas Gruenbacher 135877fede51SPhilipp Reisner void conn_wait_active_ee_empty(struct drbd_tconn *tconn) 135977fede51SPhilipp Reisner { 136077fede51SPhilipp Reisner struct drbd_conf *mdev; 136177fede51SPhilipp Reisner int vnr; 136277fede51SPhilipp Reisner 136377fede51SPhilipp Reisner rcu_read_lock(); 136477fede51SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 136577fede51SPhilipp Reisner kref_get(&mdev->kref); 136677fede51SPhilipp Reisner rcu_read_unlock(); 136777fede51SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 136877fede51SPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 136977fede51SPhilipp Reisner rcu_read_lock(); 137077fede51SPhilipp Reisner } 137177fede51SPhilipp Reisner rcu_read_unlock(); 137277fede51SPhilipp Reisner } 137377fede51SPhilipp Reisner 13744a76b161SAndreas Gruenbacher static int receive_Barrier(struct drbd_tconn *tconn, struct packet_info *pi) 1375b411b363SPhilipp Reisner { 13762451fc3bSPhilipp Reisner int rv; 1377e658983aSAndreas Gruenbacher struct p_barrier *p = pi->data; 1378b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1379b411b363SPhilipp Reisner 13809ed57dcbSLars Ellenberg /* FIXME these are unacked on connection, 13819ed57dcbSLars Ellenberg * not a specific (peer)device. 13829ed57dcbSLars Ellenberg */ 138312038a3aSPhilipp Reisner tconn->current_epoch->barrier_nr = p->barrier; 13849ed57dcbSLars Ellenberg tconn->current_epoch->tconn = tconn; 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 14039ed57dcbSLars Ellenberg conn_warn(tconn, "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 141782bc0194SAndreas Gruenbacher return 0; 14182451fc3bSPhilipp Reisner default: 14199ed57dcbSLars Ellenberg conn_err(tconn, "Strangeness in tconn->write_ordering %d\n", tconn->write_ordering); 142082bc0194SAndreas Gruenbacher return -EIO; 1421b411b363SPhilipp Reisner } 1422b411b363SPhilipp Reisner 1423b411b363SPhilipp Reisner epoch->flags = 0; 1424b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1425b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1426b411b363SPhilipp Reisner 142712038a3aSPhilipp Reisner spin_lock(&tconn->epoch_lock); 142812038a3aSPhilipp Reisner if (atomic_read(&tconn->current_epoch->epoch_size)) { 142912038a3aSPhilipp Reisner list_add(&epoch->list, &tconn->current_epoch->list); 143012038a3aSPhilipp Reisner tconn->current_epoch = epoch; 143112038a3aSPhilipp Reisner tconn->epochs++; 1432b411b363SPhilipp Reisner } else { 1433b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1434b411b363SPhilipp Reisner kfree(epoch); 1435b411b363SPhilipp Reisner } 143612038a3aSPhilipp Reisner spin_unlock(&tconn->epoch_lock); 1437b411b363SPhilipp Reisner 143882bc0194SAndreas Gruenbacher return 0; 1439b411b363SPhilipp Reisner } 1440b411b363SPhilipp Reisner 1441b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1442b411b363SPhilipp Reisner * and from receive_Data */ 1443f6ffca9fSAndreas Gruenbacher static struct drbd_peer_request * 1444f6ffca9fSAndreas Gruenbacher read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, 1445f6ffca9fSAndreas Gruenbacher int data_size) __must_hold(local) 1446b411b363SPhilipp Reisner { 14476666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1448db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1449b411b363SPhilipp Reisner struct page *page; 1450a5c31904SAndreas Gruenbacher int dgs, ds, err; 1451a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1452a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 14536b4388acSPhilipp Reisner unsigned long *data; 1454b411b363SPhilipp Reisner 145588104ca4SAndreas Gruenbacher dgs = 0; 145688104ca4SAndreas Gruenbacher if (mdev->tconn->peer_integrity_tfm) { 145788104ca4SAndreas Gruenbacher dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); 14589f5bdc33SAndreas Gruenbacher /* 14599f5bdc33SAndreas Gruenbacher * FIXME: Receive the incoming digest into the receive buffer 14609f5bdc33SAndreas Gruenbacher * here, together with its struct p_data? 14619f5bdc33SAndreas Gruenbacher */ 1462a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1463a5c31904SAndreas Gruenbacher if (err) 1464b411b363SPhilipp Reisner return NULL; 1465b411b363SPhilipp Reisner data_size -= dgs; 146688104ca4SAndreas Gruenbacher } 1467b411b363SPhilipp Reisner 1468841ce241SAndreas Gruenbacher if (!expect(data_size != 0)) 1469841ce241SAndreas Gruenbacher return NULL; 1470841ce241SAndreas Gruenbacher if (!expect(IS_ALIGNED(data_size, 512))) 1471841ce241SAndreas Gruenbacher return NULL; 1472841ce241SAndreas Gruenbacher if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) 1473841ce241SAndreas Gruenbacher return NULL; 1474b411b363SPhilipp Reisner 14756666032aSLars Ellenberg /* even though we trust out peer, 14766666032aSLars Ellenberg * we sometimes have to double check. */ 14776666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1478fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1479fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 14806666032aSLars Ellenberg (unsigned long long)capacity, 14816666032aSLars Ellenberg (unsigned long long)sector, data_size); 14826666032aSLars Ellenberg return NULL; 14836666032aSLars Ellenberg } 14846666032aSLars Ellenberg 1485b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1486b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1487b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 14880db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, id, sector, data_size, GFP_NOIO); 1489db830c46SAndreas Gruenbacher if (!peer_req) 1490b411b363SPhilipp Reisner return NULL; 149145bb912bSLars Ellenberg 1492b411b363SPhilipp Reisner ds = data_size; 1493db830c46SAndreas Gruenbacher page = peer_req->pages; 149445bb912bSLars Ellenberg page_chain_for_each(page) { 149545bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 14966b4388acSPhilipp Reisner data = kmap(page); 1497a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 14980cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 14996b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 15006b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 15016b4388acSPhilipp Reisner } 1502b411b363SPhilipp Reisner kunmap(page); 1503a5c31904SAndreas Gruenbacher if (err) { 15043967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1505b411b363SPhilipp Reisner return NULL; 1506b411b363SPhilipp Reisner } 1507a5c31904SAndreas Gruenbacher ds -= len; 1508b411b363SPhilipp Reisner } 1509b411b363SPhilipp Reisner 1510b411b363SPhilipp Reisner if (dgs) { 15115b614abeSAndreas Gruenbacher drbd_csum_ee(mdev, mdev->tconn->peer_integrity_tfm, peer_req, dig_vv); 1512b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1513470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1514470be44aSLars Ellenberg (unsigned long long)sector, data_size); 15153967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1516b411b363SPhilipp Reisner return NULL; 1517b411b363SPhilipp Reisner } 1518b411b363SPhilipp Reisner } 1519b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1520db830c46SAndreas Gruenbacher return peer_req; 1521b411b363SPhilipp Reisner } 1522b411b363SPhilipp Reisner 1523b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1524b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1525b411b363SPhilipp Reisner */ 1526b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1527b411b363SPhilipp Reisner { 1528b411b363SPhilipp Reisner struct page *page; 1529a5c31904SAndreas Gruenbacher int err = 0; 1530b411b363SPhilipp Reisner void *data; 1531b411b363SPhilipp Reisner 1532c3470cdeSLars Ellenberg if (!data_size) 1533fc5be839SAndreas Gruenbacher return 0; 1534c3470cdeSLars Ellenberg 1535c37c8ecfSAndreas Gruenbacher page = drbd_alloc_pages(mdev, 1, 1); 1536b411b363SPhilipp Reisner 1537b411b363SPhilipp Reisner data = kmap(page); 1538b411b363SPhilipp Reisner while (data_size) { 1539fc5be839SAndreas Gruenbacher unsigned int len = min_t(int, data_size, PAGE_SIZE); 1540fc5be839SAndreas Gruenbacher 1541a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 1542a5c31904SAndreas Gruenbacher if (err) 1543b411b363SPhilipp Reisner break; 1544a5c31904SAndreas Gruenbacher data_size -= len; 1545b411b363SPhilipp Reisner } 1546b411b363SPhilipp Reisner kunmap(page); 15475cc287e0SAndreas Gruenbacher drbd_free_pages(mdev, page, 0); 1548fc5be839SAndreas Gruenbacher return err; 1549b411b363SPhilipp Reisner } 1550b411b363SPhilipp Reisner 1551b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1552b411b363SPhilipp Reisner sector_t sector, int data_size) 1553b411b363SPhilipp Reisner { 1554b411b363SPhilipp Reisner struct bio_vec *bvec; 1555b411b363SPhilipp Reisner struct bio *bio; 1556a5c31904SAndreas Gruenbacher int dgs, err, i, expect; 1557a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1558a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 1559b411b363SPhilipp Reisner 156088104ca4SAndreas Gruenbacher dgs = 0; 156188104ca4SAndreas Gruenbacher if (mdev->tconn->peer_integrity_tfm) { 156288104ca4SAndreas Gruenbacher dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); 1563a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1564a5c31904SAndreas Gruenbacher if (err) 1565a5c31904SAndreas Gruenbacher return err; 1566b411b363SPhilipp Reisner data_size -= dgs; 156788104ca4SAndreas Gruenbacher } 1568b411b363SPhilipp Reisner 1569b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1570b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1571b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1572b411b363SPhilipp Reisner 1573b411b363SPhilipp Reisner bio = req->master_bio; 1574b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1575b411b363SPhilipp Reisner 1576b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1577a5c31904SAndreas Gruenbacher void *mapped = kmap(bvec->bv_page) + bvec->bv_offset; 1578b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1579a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, mapped, expect); 1580b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1581a5c31904SAndreas Gruenbacher if (err) 1582a5c31904SAndreas Gruenbacher return err; 1583a5c31904SAndreas Gruenbacher data_size -= expect; 1584b411b363SPhilipp Reisner } 1585b411b363SPhilipp Reisner 1586b411b363SPhilipp Reisner if (dgs) { 15875b614abeSAndreas Gruenbacher drbd_csum_bio(mdev, mdev->tconn->peer_integrity_tfm, bio, dig_vv); 1588b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1589b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 159028284cefSAndreas Gruenbacher return -EINVAL; 1591b411b363SPhilipp Reisner } 1592b411b363SPhilipp Reisner } 1593b411b363SPhilipp Reisner 1594b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 159528284cefSAndreas Gruenbacher return 0; 1596b411b363SPhilipp Reisner } 1597b411b363SPhilipp Reisner 1598a990be46SAndreas Gruenbacher /* 1599a990be46SAndreas Gruenbacher * e_end_resync_block() is called in asender context via 1600a990be46SAndreas Gruenbacher * drbd_finish_peer_reqs(). 1601a990be46SAndreas Gruenbacher */ 160299920dc5SAndreas Gruenbacher static int e_end_resync_block(struct drbd_work *w, int unused) 1603b411b363SPhilipp Reisner { 16048050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 16058050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 160600d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1607db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 160899920dc5SAndreas Gruenbacher int err; 1609b411b363SPhilipp Reisner 1610db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1611b411b363SPhilipp Reisner 1612db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1613db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 161499920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); 1615b411b363SPhilipp Reisner } else { 1616b411b363SPhilipp Reisner /* Record failure to sync */ 1617db830c46SAndreas Gruenbacher drbd_rs_failed_io(mdev, sector, peer_req->i.size); 1618b411b363SPhilipp Reisner 161999920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1620b411b363SPhilipp Reisner } 1621b411b363SPhilipp Reisner dec_unacked(mdev); 1622b411b363SPhilipp Reisner 162399920dc5SAndreas Gruenbacher return err; 1624b411b363SPhilipp Reisner } 1625b411b363SPhilipp Reisner 1626b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1627b411b363SPhilipp Reisner { 1628db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1629b411b363SPhilipp Reisner 1630db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); 1631db830c46SAndreas Gruenbacher if (!peer_req) 163245bb912bSLars Ellenberg goto fail; 1633b411b363SPhilipp Reisner 1634b411b363SPhilipp Reisner dec_rs_pending(mdev); 1635b411b363SPhilipp Reisner 1636b411b363SPhilipp Reisner inc_unacked(mdev); 1637b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1638b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1639b411b363SPhilipp Reisner 1640db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_resync_block; 164145bb912bSLars Ellenberg 164287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1643db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->sync_ee); 164487eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1645b411b363SPhilipp Reisner 16460f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 1647fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) 1648e1c1b0fcSAndreas Gruenbacher return 0; 164945bb912bSLars Ellenberg 165010f6d992SLars Ellenberg /* don't care for the reason here */ 165110f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 165287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1653db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 165487eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 165522cc37a9SLars Ellenberg 16563967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 165745bb912bSLars Ellenberg fail: 165845bb912bSLars Ellenberg put_ldev(mdev); 1659e1c1b0fcSAndreas Gruenbacher return -EIO; 1660b411b363SPhilipp Reisner } 1661b411b363SPhilipp Reisner 1662668eebc6SAndreas Gruenbacher static struct drbd_request * 1663bc9c5c41SAndreas Gruenbacher find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, 1664bc9c5c41SAndreas Gruenbacher sector_t sector, bool missing_ok, const char *func) 1665668eebc6SAndreas Gruenbacher { 1666668eebc6SAndreas Gruenbacher struct drbd_request *req; 1667668eebc6SAndreas Gruenbacher 1668bc9c5c41SAndreas Gruenbacher /* Request object according to our peer */ 1669bc9c5c41SAndreas Gruenbacher req = (struct drbd_request *)(unsigned long)id; 16705e472264SAndreas Gruenbacher if (drbd_contains_interval(root, sector, &req->i) && req->i.local) 1671668eebc6SAndreas Gruenbacher return req; 1672c3afd8f5SAndreas Gruenbacher if (!missing_ok) { 16735af172edSAndreas Gruenbacher dev_err(DEV, "%s: failed to find request 0x%lx, sector %llus\n", func, 1674c3afd8f5SAndreas Gruenbacher (unsigned long)id, (unsigned long long)sector); 1675c3afd8f5SAndreas Gruenbacher } 1676668eebc6SAndreas Gruenbacher return NULL; 1677668eebc6SAndreas Gruenbacher } 1678668eebc6SAndreas Gruenbacher 16794a76b161SAndreas Gruenbacher static int receive_DataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1680b411b363SPhilipp Reisner { 16814a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1682b411b363SPhilipp Reisner struct drbd_request *req; 1683b411b363SPhilipp Reisner sector_t sector; 168482bc0194SAndreas Gruenbacher int err; 1685e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 16864a76b161SAndreas Gruenbacher 16874a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 16884a76b161SAndreas Gruenbacher if (!mdev) 16894a76b161SAndreas Gruenbacher return -EIO; 1690b411b363SPhilipp Reisner 1691b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1692b411b363SPhilipp Reisner 169387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1694bc9c5c41SAndreas Gruenbacher req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); 169587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1696c3afd8f5SAndreas Gruenbacher if (unlikely(!req)) 169782bc0194SAndreas Gruenbacher return -EIO; 1698b411b363SPhilipp Reisner 169924c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1700b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1701b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1702e2857216SAndreas Gruenbacher err = recv_dless_read(mdev, req, sector, pi->size); 170382bc0194SAndreas Gruenbacher if (!err) 17048554df1cSAndreas Gruenbacher req_mod(req, DATA_RECEIVED); 1705b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1706b411b363SPhilipp Reisner * I don't think we may complete this just yet 1707b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1708b411b363SPhilipp Reisner 170982bc0194SAndreas Gruenbacher return err; 1710b411b363SPhilipp Reisner } 1711b411b363SPhilipp Reisner 17124a76b161SAndreas Gruenbacher static int receive_RSDataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1713b411b363SPhilipp Reisner { 17144a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1715b411b363SPhilipp Reisner sector_t sector; 171682bc0194SAndreas Gruenbacher int err; 1717e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 17184a76b161SAndreas Gruenbacher 17194a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 17204a76b161SAndreas Gruenbacher if (!mdev) 17214a76b161SAndreas Gruenbacher return -EIO; 1722b411b363SPhilipp Reisner 1723b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1724b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1725b411b363SPhilipp Reisner 1726b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1727b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1728b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1729fcefa62eSAndreas Gruenbacher * or in drbd_peer_request_endio. */ 1730e2857216SAndreas Gruenbacher err = recv_resync_read(mdev, sector, pi->size); 1731b411b363SPhilipp Reisner } else { 1732b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1733b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1734b411b363SPhilipp Reisner 1735e2857216SAndreas Gruenbacher err = drbd_drain_block(mdev, pi->size); 1736b411b363SPhilipp Reisner 1737e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 1738b411b363SPhilipp Reisner } 1739b411b363SPhilipp Reisner 1740e2857216SAndreas Gruenbacher atomic_add(pi->size >> 9, &mdev->rs_sect_in); 1741778f271dSPhilipp Reisner 174282bc0194SAndreas Gruenbacher return err; 1743b411b363SPhilipp Reisner } 1744b411b363SPhilipp Reisner 17457be8da07SAndreas Gruenbacher static void restart_conflicting_writes(struct drbd_conf *mdev, 17467be8da07SAndreas Gruenbacher sector_t sector, int size) 17477be8da07SAndreas Gruenbacher { 17487be8da07SAndreas Gruenbacher struct drbd_interval *i; 17497be8da07SAndreas Gruenbacher struct drbd_request *req; 17507be8da07SAndreas Gruenbacher 17517be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 17527be8da07SAndreas Gruenbacher if (!i->local) 17537be8da07SAndreas Gruenbacher continue; 17547be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 17557be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 17567be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) 17577be8da07SAndreas Gruenbacher continue; 17582312f0b3SLars Ellenberg /* as it is RQ_POSTPONED, this will cause it to 17592312f0b3SLars Ellenberg * be queued on the retry workqueue. */ 17602312f0b3SLars Ellenberg __req_mod(req, DISCARD_WRITE, NULL); 17617be8da07SAndreas Gruenbacher } 17627be8da07SAndreas Gruenbacher } 17637be8da07SAndreas Gruenbacher 1764a990be46SAndreas Gruenbacher /* 1765a990be46SAndreas Gruenbacher * e_end_block() is called in asender context via drbd_finish_peer_reqs(). 1766b411b363SPhilipp Reisner */ 176799920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *w, int cancel) 1768b411b363SPhilipp Reisner { 17698050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 17708050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 177100d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1772db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 177399920dc5SAndreas Gruenbacher int err = 0, pcmd; 1774b411b363SPhilipp Reisner 1775303d1448SPhilipp Reisner if (peer_req->flags & EE_SEND_WRITE_ACK) { 1776db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1777b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1778b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1779db830c46SAndreas Gruenbacher peer_req->flags & EE_MAY_SET_IN_SYNC) ? 1780b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 178199920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, pcmd, peer_req); 1782b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1783db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 1784b411b363SPhilipp Reisner } else { 178599920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1786b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1787b411b363SPhilipp Reisner * maybe assert this? */ 1788b411b363SPhilipp Reisner } 1789b411b363SPhilipp Reisner dec_unacked(mdev); 1790b411b363SPhilipp Reisner } 1791b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1792b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 1793302bdeaeSPhilipp Reisner if (peer_req->flags & EE_IN_INTERVAL_TREE) { 179487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1795db830c46SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&peer_req->i)); 1796db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 17977be8da07SAndreas Gruenbacher if (peer_req->flags & EE_RESTART_REQUESTS) 17987be8da07SAndreas Gruenbacher restart_conflicting_writes(mdev, sector, peer_req->i.size); 179987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1800bb3bfe96SAndreas Gruenbacher } else 1801db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1802b411b363SPhilipp Reisner 18031e9dd291SPhilipp Reisner drbd_may_finish_epoch(mdev->tconn, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1804b411b363SPhilipp Reisner 180599920dc5SAndreas Gruenbacher return err; 1806b411b363SPhilipp Reisner } 1807b411b363SPhilipp Reisner 18087be8da07SAndreas Gruenbacher static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) 1809b411b363SPhilipp Reisner { 18107be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 18118050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 18128050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 181399920dc5SAndreas Gruenbacher int err; 1814b411b363SPhilipp Reisner 181599920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, ack, peer_req); 1816b411b363SPhilipp Reisner dec_unacked(mdev); 1817b411b363SPhilipp Reisner 181899920dc5SAndreas Gruenbacher return err; 1819b411b363SPhilipp Reisner } 1820b411b363SPhilipp Reisner 182199920dc5SAndreas Gruenbacher static int e_send_discard_write(struct drbd_work *w, int unused) 18227be8da07SAndreas Gruenbacher { 18237be8da07SAndreas Gruenbacher return e_send_ack(w, P_DISCARD_WRITE); 18247be8da07SAndreas Gruenbacher } 18257be8da07SAndreas Gruenbacher 182699920dc5SAndreas Gruenbacher static int e_send_retry_write(struct drbd_work *w, int unused) 18277be8da07SAndreas Gruenbacher { 18287be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = w->mdev->tconn; 18297be8da07SAndreas Gruenbacher 18307be8da07SAndreas Gruenbacher return e_send_ack(w, tconn->agreed_pro_version >= 100 ? 18317be8da07SAndreas Gruenbacher P_RETRY_WRITE : P_DISCARD_WRITE); 18327be8da07SAndreas Gruenbacher } 18337be8da07SAndreas Gruenbacher 18343e394da1SAndreas Gruenbacher static bool seq_greater(u32 a, u32 b) 18353e394da1SAndreas Gruenbacher { 18363e394da1SAndreas Gruenbacher /* 18373e394da1SAndreas Gruenbacher * We assume 32-bit wrap-around here. 18383e394da1SAndreas Gruenbacher * For 24-bit wrap-around, we would have to shift: 18393e394da1SAndreas Gruenbacher * a <<= 8; b <<= 8; 18403e394da1SAndreas Gruenbacher */ 18413e394da1SAndreas Gruenbacher return (s32)a - (s32)b > 0; 18423e394da1SAndreas Gruenbacher } 18433e394da1SAndreas Gruenbacher 18443e394da1SAndreas Gruenbacher static u32 seq_max(u32 a, u32 b) 18453e394da1SAndreas Gruenbacher { 18463e394da1SAndreas Gruenbacher return seq_greater(a, b) ? a : b; 18473e394da1SAndreas Gruenbacher } 18483e394da1SAndreas Gruenbacher 18497be8da07SAndreas Gruenbacher static bool need_peer_seq(struct drbd_conf *mdev) 18507be8da07SAndreas Gruenbacher { 18517be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 1852302bdeaeSPhilipp Reisner int tp; 18537be8da07SAndreas Gruenbacher 18547be8da07SAndreas Gruenbacher /* 18557be8da07SAndreas Gruenbacher * We only need to keep track of the last packet_seq number of our peer 18567be8da07SAndreas Gruenbacher * if we are in dual-primary mode and we have the discard flag set; see 18577be8da07SAndreas Gruenbacher * handle_write_conflicts(). 18587be8da07SAndreas Gruenbacher */ 1859302bdeaeSPhilipp Reisner 1860302bdeaeSPhilipp Reisner rcu_read_lock(); 1861302bdeaeSPhilipp Reisner tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; 1862302bdeaeSPhilipp Reisner rcu_read_unlock(); 1863302bdeaeSPhilipp Reisner 1864302bdeaeSPhilipp Reisner return tp && test_bit(DISCARD_CONCURRENT, &tconn->flags); 18657be8da07SAndreas Gruenbacher } 18667be8da07SAndreas Gruenbacher 186743ae077dSAndreas Gruenbacher static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) 18683e394da1SAndreas Gruenbacher { 18693c13b680SLars Ellenberg unsigned int newest_peer_seq; 18703e394da1SAndreas Gruenbacher 18717be8da07SAndreas Gruenbacher if (need_peer_seq(mdev)) { 18723e394da1SAndreas Gruenbacher spin_lock(&mdev->peer_seq_lock); 18733c13b680SLars Ellenberg newest_peer_seq = seq_max(mdev->peer_seq, peer_seq); 18743c13b680SLars Ellenberg mdev->peer_seq = newest_peer_seq; 18753e394da1SAndreas Gruenbacher spin_unlock(&mdev->peer_seq_lock); 18763c13b680SLars Ellenberg /* wake up only if we actually changed mdev->peer_seq */ 18773c13b680SLars Ellenberg if (peer_seq == newest_peer_seq) 18783e394da1SAndreas Gruenbacher wake_up(&mdev->seq_wait); 18793e394da1SAndreas Gruenbacher } 18807be8da07SAndreas Gruenbacher } 18813e394da1SAndreas Gruenbacher 1882d93f6302SLars Ellenberg static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2) 1883d93f6302SLars Ellenberg { 1884d93f6302SLars Ellenberg return !((s1 + (l1>>9) <= s2) || (s1 >= s2 + (l2>>9))); 1885d93f6302SLars Ellenberg } 1886d93f6302SLars Ellenberg 1887d93f6302SLars Ellenberg /* maybe change sync_ee into interval trees as well? */ 1888d93f6302SLars Ellenberg static bool overlaping_resync_write(struct drbd_conf *mdev, struct drbd_peer_request *peer_req) 1889d93f6302SLars Ellenberg { 1890d93f6302SLars Ellenberg struct drbd_peer_request *rs_req; 1891d93f6302SLars Ellenberg bool rv = 0; 1892d93f6302SLars Ellenberg 1893d93f6302SLars Ellenberg spin_lock_irq(&mdev->tconn->req_lock); 1894d93f6302SLars Ellenberg list_for_each_entry(rs_req, &mdev->sync_ee, w.list) { 1895d93f6302SLars Ellenberg if (overlaps(peer_req->i.sector, peer_req->i.size, 1896d93f6302SLars Ellenberg rs_req->i.sector, rs_req->i.size)) { 1897d93f6302SLars Ellenberg rv = 1; 1898d93f6302SLars Ellenberg break; 1899d93f6302SLars Ellenberg } 1900d93f6302SLars Ellenberg } 1901d93f6302SLars Ellenberg spin_unlock_irq(&mdev->tconn->req_lock); 1902d93f6302SLars Ellenberg 1903d93f6302SLars Ellenberg if (rv) 1904d93f6302SLars Ellenberg dev_warn(DEV, "WARN: Avoiding concurrent data/resync write to single sector.\n"); 1905d93f6302SLars Ellenberg 1906d93f6302SLars Ellenberg return rv; 1907d93f6302SLars Ellenberg } 1908d93f6302SLars Ellenberg 1909b411b363SPhilipp Reisner /* Called from receive_Data. 1910b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1911b411b363SPhilipp Reisner * 1912b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1913b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1914b411b363SPhilipp Reisner * been sent. 1915b411b363SPhilipp Reisner * 1916b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1917b411b363SPhilipp Reisner * 1918b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1919b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1920b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1921b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1922b411b363SPhilipp Reisner * 1923b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1924b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1925b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1926b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1927b411b363SPhilipp Reisner * 1928b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1929b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 19307be8da07SAndreas Gruenbacher static int wait_for_and_update_peer_seq(struct drbd_conf *mdev, const u32 peer_seq) 1931b411b363SPhilipp Reisner { 1932b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1933b411b363SPhilipp Reisner long timeout; 19347be8da07SAndreas Gruenbacher int ret; 19357be8da07SAndreas Gruenbacher 19367be8da07SAndreas Gruenbacher if (!need_peer_seq(mdev)) 19377be8da07SAndreas Gruenbacher return 0; 19387be8da07SAndreas Gruenbacher 1939b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1940b411b363SPhilipp Reisner for (;;) { 19417be8da07SAndreas Gruenbacher if (!seq_greater(peer_seq - 1, mdev->peer_seq)) { 19427be8da07SAndreas Gruenbacher mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); 19437be8da07SAndreas Gruenbacher ret = 0; 1944b411b363SPhilipp Reisner break; 19457be8da07SAndreas Gruenbacher } 1946b411b363SPhilipp Reisner if (signal_pending(current)) { 1947b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1948b411b363SPhilipp Reisner break; 1949b411b363SPhilipp Reisner } 19507be8da07SAndreas Gruenbacher prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1951b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 195244ed167dSPhilipp Reisner rcu_read_lock(); 195344ed167dSPhilipp Reisner timeout = rcu_dereference(mdev->tconn->net_conf)->ping_timeo*HZ/10; 195444ed167dSPhilipp Reisner rcu_read_unlock(); 195571b1c1ebSAndreas Gruenbacher timeout = schedule_timeout(timeout); 1956b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 19577be8da07SAndreas Gruenbacher if (!timeout) { 1958b411b363SPhilipp Reisner ret = -ETIMEDOUT; 195971b1c1ebSAndreas Gruenbacher dev_err(DEV, "Timed out waiting for missing ack packets; disconnecting\n"); 1960b411b363SPhilipp Reisner break; 1961b411b363SPhilipp Reisner } 1962b411b363SPhilipp Reisner } 1963b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 19647be8da07SAndreas Gruenbacher finish_wait(&mdev->seq_wait, &wait); 1965b411b363SPhilipp Reisner return ret; 1966b411b363SPhilipp Reisner } 1967b411b363SPhilipp Reisner 1968688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1969688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1970688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1971688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 197276d2e7ecSPhilipp Reisner { 197376d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 197476d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1975688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 197676d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 197776d2e7ecSPhilipp Reisner } 197876d2e7ecSPhilipp Reisner 19797be8da07SAndreas Gruenbacher static void fail_postponed_requests(struct drbd_conf *mdev, sector_t sector, 19807be8da07SAndreas Gruenbacher unsigned int size) 19817be8da07SAndreas Gruenbacher { 19827be8da07SAndreas Gruenbacher struct drbd_interval *i; 19837be8da07SAndreas Gruenbacher 19847be8da07SAndreas Gruenbacher repeat: 19857be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 19867be8da07SAndreas Gruenbacher struct drbd_request *req; 19877be8da07SAndreas Gruenbacher struct bio_and_error m; 19887be8da07SAndreas Gruenbacher 19897be8da07SAndreas Gruenbacher if (!i->local) 19907be8da07SAndreas Gruenbacher continue; 19917be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 19927be8da07SAndreas Gruenbacher if (!(req->rq_state & RQ_POSTPONED)) 19937be8da07SAndreas Gruenbacher continue; 19947be8da07SAndreas Gruenbacher req->rq_state &= ~RQ_POSTPONED; 19957be8da07SAndreas Gruenbacher __req_mod(req, NEG_ACKED, &m); 19967be8da07SAndreas Gruenbacher spin_unlock_irq(&mdev->tconn->req_lock); 19977be8da07SAndreas Gruenbacher if (m.bio) 19987be8da07SAndreas Gruenbacher complete_master_bio(mdev, &m); 19997be8da07SAndreas Gruenbacher spin_lock_irq(&mdev->tconn->req_lock); 20007be8da07SAndreas Gruenbacher goto repeat; 20017be8da07SAndreas Gruenbacher } 20027be8da07SAndreas Gruenbacher } 20037be8da07SAndreas Gruenbacher 20047be8da07SAndreas Gruenbacher static int handle_write_conflicts(struct drbd_conf *mdev, 20057be8da07SAndreas Gruenbacher struct drbd_peer_request *peer_req) 20067be8da07SAndreas Gruenbacher { 20077be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 20087be8da07SAndreas Gruenbacher bool resolve_conflicts = test_bit(DISCARD_CONCURRENT, &tconn->flags); 20097be8da07SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 20107be8da07SAndreas Gruenbacher const unsigned int size = peer_req->i.size; 20117be8da07SAndreas Gruenbacher struct drbd_interval *i; 20127be8da07SAndreas Gruenbacher bool equal; 20137be8da07SAndreas Gruenbacher int err; 20147be8da07SAndreas Gruenbacher 20157be8da07SAndreas Gruenbacher /* 20167be8da07SAndreas Gruenbacher * Inserting the peer request into the write_requests tree will prevent 20177be8da07SAndreas Gruenbacher * new conflicting local requests from being added. 20187be8da07SAndreas Gruenbacher */ 20197be8da07SAndreas Gruenbacher drbd_insert_interval(&mdev->write_requests, &peer_req->i); 20207be8da07SAndreas Gruenbacher 20217be8da07SAndreas Gruenbacher repeat: 20227be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 20237be8da07SAndreas Gruenbacher if (i == &peer_req->i) 20247be8da07SAndreas Gruenbacher continue; 20257be8da07SAndreas Gruenbacher 20267be8da07SAndreas Gruenbacher if (!i->local) { 20277be8da07SAndreas Gruenbacher /* 20287be8da07SAndreas Gruenbacher * Our peer has sent a conflicting remote request; this 20297be8da07SAndreas Gruenbacher * should not happen in a two-node setup. Wait for the 20307be8da07SAndreas Gruenbacher * earlier peer request to complete. 20317be8da07SAndreas Gruenbacher */ 20327be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, i); 20337be8da07SAndreas Gruenbacher if (err) 20347be8da07SAndreas Gruenbacher goto out; 20357be8da07SAndreas Gruenbacher goto repeat; 20367be8da07SAndreas Gruenbacher } 20377be8da07SAndreas Gruenbacher 20387be8da07SAndreas Gruenbacher equal = i->sector == sector && i->size == size; 20397be8da07SAndreas Gruenbacher if (resolve_conflicts) { 20407be8da07SAndreas Gruenbacher /* 20417be8da07SAndreas Gruenbacher * If the peer request is fully contained within the 20427be8da07SAndreas Gruenbacher * overlapping request, it can be discarded; otherwise, 20437be8da07SAndreas Gruenbacher * it will be retried once all overlapping requests 20447be8da07SAndreas Gruenbacher * have completed. 20457be8da07SAndreas Gruenbacher */ 20467be8da07SAndreas Gruenbacher bool discard = i->sector <= sector && i->sector + 20477be8da07SAndreas Gruenbacher (i->size >> 9) >= sector + (size >> 9); 20487be8da07SAndreas Gruenbacher 20497be8da07SAndreas Gruenbacher if (!equal) 20507be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 20517be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u, " 20527be8da07SAndreas Gruenbacher "assuming %s came first\n", 20537be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 20547be8da07SAndreas Gruenbacher (unsigned long long)sector, size, 20557be8da07SAndreas Gruenbacher discard ? "local" : "remote"); 20567be8da07SAndreas Gruenbacher 20577be8da07SAndreas Gruenbacher inc_unacked(mdev); 20587be8da07SAndreas Gruenbacher peer_req->w.cb = discard ? e_send_discard_write : 20597be8da07SAndreas Gruenbacher e_send_retry_write; 20607be8da07SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->done_ee); 20617be8da07SAndreas Gruenbacher wake_asender(mdev->tconn); 20627be8da07SAndreas Gruenbacher 20637be8da07SAndreas Gruenbacher err = -ENOENT; 20647be8da07SAndreas Gruenbacher goto out; 20657be8da07SAndreas Gruenbacher } else { 20667be8da07SAndreas Gruenbacher struct drbd_request *req = 20677be8da07SAndreas Gruenbacher container_of(i, struct drbd_request, i); 20687be8da07SAndreas Gruenbacher 20697be8da07SAndreas Gruenbacher if (!equal) 20707be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 20717be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u\n", 20727be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 20737be8da07SAndreas Gruenbacher (unsigned long long)sector, size); 20747be8da07SAndreas Gruenbacher 20757be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 20767be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) { 20777be8da07SAndreas Gruenbacher /* 20787be8da07SAndreas Gruenbacher * Wait for the node with the discard flag to 20797be8da07SAndreas Gruenbacher * decide if this request will be discarded or 20807be8da07SAndreas Gruenbacher * retried. Requests that are discarded will 20817be8da07SAndreas Gruenbacher * disappear from the write_requests tree. 20827be8da07SAndreas Gruenbacher * 20837be8da07SAndreas Gruenbacher * In addition, wait for the conflicting 20847be8da07SAndreas Gruenbacher * request to finish locally before submitting 20857be8da07SAndreas Gruenbacher * the conflicting peer request. 20867be8da07SAndreas Gruenbacher */ 20877be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, &req->i); 20887be8da07SAndreas Gruenbacher if (err) { 20897be8da07SAndreas Gruenbacher _conn_request_state(mdev->tconn, 20907be8da07SAndreas Gruenbacher NS(conn, C_TIMEOUT), 20917be8da07SAndreas Gruenbacher CS_HARD); 20927be8da07SAndreas Gruenbacher fail_postponed_requests(mdev, sector, size); 20937be8da07SAndreas Gruenbacher goto out; 20947be8da07SAndreas Gruenbacher } 20957be8da07SAndreas Gruenbacher goto repeat; 20967be8da07SAndreas Gruenbacher } 20977be8da07SAndreas Gruenbacher /* 20987be8da07SAndreas Gruenbacher * Remember to restart the conflicting requests after 20997be8da07SAndreas Gruenbacher * the new peer request has completed. 21007be8da07SAndreas Gruenbacher */ 21017be8da07SAndreas Gruenbacher peer_req->flags |= EE_RESTART_REQUESTS; 21027be8da07SAndreas Gruenbacher } 21037be8da07SAndreas Gruenbacher } 21047be8da07SAndreas Gruenbacher err = 0; 21057be8da07SAndreas Gruenbacher 21067be8da07SAndreas Gruenbacher out: 21077be8da07SAndreas Gruenbacher if (err) 21087be8da07SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 21097be8da07SAndreas Gruenbacher return err; 21107be8da07SAndreas Gruenbacher } 21117be8da07SAndreas Gruenbacher 2112b411b363SPhilipp Reisner /* mirrored write */ 21134a76b161SAndreas Gruenbacher static int receive_Data(struct drbd_tconn *tconn, struct packet_info *pi) 2114b411b363SPhilipp Reisner { 21154a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2116b411b363SPhilipp Reisner sector_t sector; 2117db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2118e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 21197be8da07SAndreas Gruenbacher u32 peer_seq = be32_to_cpu(p->seq_num); 2120b411b363SPhilipp Reisner int rw = WRITE; 2121b411b363SPhilipp Reisner u32 dp_flags; 2122302bdeaeSPhilipp Reisner int err, tp; 21237be8da07SAndreas Gruenbacher 21244a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 21254a76b161SAndreas Gruenbacher if (!mdev) 21264a76b161SAndreas Gruenbacher return -EIO; 21274a76b161SAndreas Gruenbacher 2128b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 212982bc0194SAndreas Gruenbacher int err2; 213082bc0194SAndreas Gruenbacher 21317be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 2132e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 213312038a3aSPhilipp Reisner atomic_inc(&tconn->current_epoch->epoch_size); 2134e2857216SAndreas Gruenbacher err2 = drbd_drain_block(mdev, pi->size); 213582bc0194SAndreas Gruenbacher if (!err) 213682bc0194SAndreas Gruenbacher err = err2; 213782bc0194SAndreas Gruenbacher return err; 2138b411b363SPhilipp Reisner } 2139b411b363SPhilipp Reisner 2140fcefa62eSAndreas Gruenbacher /* 2141fcefa62eSAndreas Gruenbacher * Corresponding put_ldev done either below (on various errors), or in 2142fcefa62eSAndreas Gruenbacher * drbd_peer_request_endio, if we successfully submit the data at the 2143fcefa62eSAndreas Gruenbacher * end of this function. 2144fcefa62eSAndreas Gruenbacher */ 2145b411b363SPhilipp Reisner 2146b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2147e2857216SAndreas Gruenbacher peer_req = read_in_block(mdev, p->block_id, sector, pi->size); 2148db830c46SAndreas Gruenbacher if (!peer_req) { 2149b411b363SPhilipp Reisner put_ldev(mdev); 215082bc0194SAndreas Gruenbacher return -EIO; 2151b411b363SPhilipp Reisner } 2152b411b363SPhilipp Reisner 2153db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_block; 2154b411b363SPhilipp Reisner 2155688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 2156688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 2157688593c5SLars Ellenberg 2158688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 2159db830c46SAndreas Gruenbacher peer_req->flags |= EE_MAY_SET_IN_SYNC; 2160688593c5SLars Ellenberg 216112038a3aSPhilipp Reisner spin_lock(&tconn->epoch_lock); 216212038a3aSPhilipp Reisner peer_req->epoch = tconn->current_epoch; 2163db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->epoch_size); 2164db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->active); 216512038a3aSPhilipp Reisner spin_unlock(&tconn->epoch_lock); 2166b411b363SPhilipp Reisner 2167302bdeaeSPhilipp Reisner rcu_read_lock(); 2168302bdeaeSPhilipp Reisner tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; 2169302bdeaeSPhilipp Reisner rcu_read_unlock(); 2170302bdeaeSPhilipp Reisner if (tp) { 2171302bdeaeSPhilipp Reisner peer_req->flags |= EE_IN_INTERVAL_TREE; 21727be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 21737be8da07SAndreas Gruenbacher if (err) 2174b411b363SPhilipp Reisner goto out_interrupted; 217587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 21767be8da07SAndreas Gruenbacher err = handle_write_conflicts(mdev, peer_req); 21777be8da07SAndreas Gruenbacher if (err) { 217887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 21797be8da07SAndreas Gruenbacher if (err == -ENOENT) { 2180b411b363SPhilipp Reisner put_ldev(mdev); 218182bc0194SAndreas Gruenbacher return 0; 2182b411b363SPhilipp Reisner } 2183b411b363SPhilipp Reisner goto out_interrupted; 2184b411b363SPhilipp Reisner } 21857be8da07SAndreas Gruenbacher } else 218687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2187db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->active_ee); 218887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2189b411b363SPhilipp Reisner 2190d93f6302SLars Ellenberg if (mdev->state.conn == C_SYNC_TARGET) 2191d93f6302SLars Ellenberg wait_event(mdev->ee_wait, !overlaping_resync_write(mdev, peer_req)); 2192d93f6302SLars Ellenberg 2193303d1448SPhilipp Reisner if (mdev->tconn->agreed_pro_version < 100) { 219444ed167dSPhilipp Reisner rcu_read_lock(); 219544ed167dSPhilipp Reisner switch (rcu_dereference(mdev->tconn->net_conf)->wire_protocol) { 2196b411b363SPhilipp Reisner case DRBD_PROT_C: 2197303d1448SPhilipp Reisner dp_flags |= DP_SEND_WRITE_ACK; 2198303d1448SPhilipp Reisner break; 2199303d1448SPhilipp Reisner case DRBD_PROT_B: 2200303d1448SPhilipp Reisner dp_flags |= DP_SEND_RECEIVE_ACK; 2201303d1448SPhilipp Reisner break; 2202303d1448SPhilipp Reisner } 220344ed167dSPhilipp Reisner rcu_read_unlock(); 2204303d1448SPhilipp Reisner } 2205303d1448SPhilipp Reisner 2206303d1448SPhilipp Reisner if (dp_flags & DP_SEND_WRITE_ACK) { 2207303d1448SPhilipp Reisner peer_req->flags |= EE_SEND_WRITE_ACK; 2208b411b363SPhilipp Reisner inc_unacked(mdev); 2209b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 2210b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 2211303d1448SPhilipp Reisner } 2212303d1448SPhilipp Reisner 2213303d1448SPhilipp Reisner if (dp_flags & DP_SEND_RECEIVE_ACK) { 2214b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 2215b411b363SPhilipp Reisner * sends on the msock, but anyways */ 2216db830c46SAndreas Gruenbacher drbd_send_ack(mdev, P_RECV_ACK, peer_req); 2217b411b363SPhilipp Reisner } 2218b411b363SPhilipp Reisner 22196719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 2220b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 2221db830c46SAndreas Gruenbacher drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); 2222db830c46SAndreas Gruenbacher peer_req->flags |= EE_CALL_AL_COMPLETE_IO; 2223db830c46SAndreas Gruenbacher peer_req->flags &= ~EE_MAY_SET_IN_SYNC; 2224181286adSLars Ellenberg drbd_al_begin_io(mdev, &peer_req->i); 2225b411b363SPhilipp Reisner } 2226b411b363SPhilipp Reisner 222782bc0194SAndreas Gruenbacher err = drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR); 222882bc0194SAndreas Gruenbacher if (!err) 222982bc0194SAndreas Gruenbacher return 0; 2230b411b363SPhilipp Reisner 223110f6d992SLars Ellenberg /* don't care for the reason here */ 223210f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 223387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2234db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 2235db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 223687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2237db830c46SAndreas Gruenbacher if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) 2238181286adSLars Ellenberg drbd_al_complete_io(mdev, &peer_req->i); 223922cc37a9SLars Ellenberg 2240b411b363SPhilipp Reisner out_interrupted: 22411e9dd291SPhilipp Reisner drbd_may_finish_epoch(tconn, peer_req->epoch, EV_PUT + EV_CLEANUP); 2242b411b363SPhilipp Reisner put_ldev(mdev); 22433967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 224482bc0194SAndreas Gruenbacher return err; 2245b411b363SPhilipp Reisner } 2246b411b363SPhilipp Reisner 22470f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 22480f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 22490f0601f4SLars Ellenberg * 22500f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 22510f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 22520f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 22530f0601f4SLars Ellenberg * activity, it obviously is "busy". 22540f0601f4SLars Ellenberg * 22550f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 22560f0601f4SLars Ellenberg * to have a short time average so we can react faster. 22570f0601f4SLars Ellenberg */ 2258e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 22590f0601f4SLars Ellenberg { 22600f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 22610f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 2262e3555d85SPhilipp Reisner struct lc_element *tmp; 22630f0601f4SLars Ellenberg int curr_events; 22640f0601f4SLars Ellenberg int throttle = 0; 2265daeda1ccSPhilipp Reisner unsigned int c_min_rate; 2266daeda1ccSPhilipp Reisner 2267daeda1ccSPhilipp Reisner rcu_read_lock(); 2268daeda1ccSPhilipp Reisner c_min_rate = rcu_dereference(mdev->ldev->disk_conf)->c_min_rate; 2269daeda1ccSPhilipp Reisner rcu_read_unlock(); 22700f0601f4SLars Ellenberg 22710f0601f4SLars Ellenberg /* feature disabled? */ 2272daeda1ccSPhilipp Reisner if (c_min_rate == 0) 22730f0601f4SLars Ellenberg return 0; 22740f0601f4SLars Ellenberg 2275e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 2276e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 2277e3555d85SPhilipp Reisner if (tmp) { 2278e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 2279e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 2280e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2281e3555d85SPhilipp Reisner return 0; 2282e3555d85SPhilipp Reisner } 2283e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 2284e3555d85SPhilipp Reisner } 2285e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2286e3555d85SPhilipp Reisner 22870f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 22880f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 22890f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 2290e3555d85SPhilipp Reisner 22910f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 22920f0601f4SLars Ellenberg unsigned long rs_left; 22930f0601f4SLars Ellenberg int i; 22940f0601f4SLars Ellenberg 22950f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 22960f0601f4SLars Ellenberg 22970f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 22980f0601f4SLars Ellenberg * approx. */ 22992649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 23002649f080SLars Ellenberg 23012649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 23022649f080SLars Ellenberg rs_left = mdev->ov_left; 23032649f080SLars Ellenberg else 23040f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 23050f0601f4SLars Ellenberg 23060f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 23070f0601f4SLars Ellenberg if (!dt) 23080f0601f4SLars Ellenberg dt++; 23090f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 23100f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 23110f0601f4SLars Ellenberg 2312daeda1ccSPhilipp Reisner if (dbdt > c_min_rate) 23130f0601f4SLars Ellenberg throttle = 1; 23140f0601f4SLars Ellenberg } 23150f0601f4SLars Ellenberg return throttle; 23160f0601f4SLars Ellenberg } 23170f0601f4SLars Ellenberg 23180f0601f4SLars Ellenberg 23194a76b161SAndreas Gruenbacher static int receive_DataRequest(struct drbd_tconn *tconn, struct packet_info *pi) 2320b411b363SPhilipp Reisner { 23214a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2322b411b363SPhilipp Reisner sector_t sector; 23234a76b161SAndreas Gruenbacher sector_t capacity; 2324db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2325b411b363SPhilipp Reisner struct digest_info *di = NULL; 2326b18b37beSPhilipp Reisner int size, verb; 2327b411b363SPhilipp Reisner unsigned int fault_type; 2328e658983aSAndreas Gruenbacher struct p_block_req *p = pi->data; 23294a76b161SAndreas Gruenbacher 23304a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 23314a76b161SAndreas Gruenbacher if (!mdev) 23324a76b161SAndreas Gruenbacher return -EIO; 23334a76b161SAndreas Gruenbacher capacity = drbd_get_capacity(mdev->this_bdev); 2334b411b363SPhilipp Reisner 2335b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2336b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2337b411b363SPhilipp Reisner 2338c670a398SAndreas Gruenbacher if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { 2339b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2340b411b363SPhilipp Reisner (unsigned long long)sector, size); 234182bc0194SAndreas Gruenbacher return -EINVAL; 2342b411b363SPhilipp Reisner } 2343b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 2344b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2345b411b363SPhilipp Reisner (unsigned long long)sector, size); 234682bc0194SAndreas Gruenbacher return -EINVAL; 2347b411b363SPhilipp Reisner } 2348b411b363SPhilipp Reisner 2349b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 2350b18b37beSPhilipp Reisner verb = 1; 2351e2857216SAndreas Gruenbacher switch (pi->cmd) { 2352b18b37beSPhilipp Reisner case P_DATA_REQUEST: 2353b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 2354b18b37beSPhilipp Reisner break; 2355b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2356b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2357b18b37beSPhilipp Reisner case P_OV_REQUEST: 2358b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 2359b18b37beSPhilipp Reisner break; 2360b18b37beSPhilipp Reisner case P_OV_REPLY: 2361b18b37beSPhilipp Reisner verb = 0; 2362b18b37beSPhilipp Reisner dec_rs_pending(mdev); 2363b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 2364b18b37beSPhilipp Reisner break; 2365b18b37beSPhilipp Reisner default: 236649ba9b1bSAndreas Gruenbacher BUG(); 2367b18b37beSPhilipp Reisner } 2368b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2369b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2370b411b363SPhilipp Reisner "no local data.\n"); 2371b18b37beSPhilipp Reisner 2372a821cc4aSLars Ellenberg /* drain possibly payload */ 2373e2857216SAndreas Gruenbacher return drbd_drain_block(mdev, pi->size); 2374b411b363SPhilipp Reisner } 2375b411b363SPhilipp Reisner 2376b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2377b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2378b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 23790db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, p->block_id, sector, size, GFP_NOIO); 2380db830c46SAndreas Gruenbacher if (!peer_req) { 2381b411b363SPhilipp Reisner put_ldev(mdev); 238282bc0194SAndreas Gruenbacher return -ENOMEM; 2383b411b363SPhilipp Reisner } 2384b411b363SPhilipp Reisner 2385e2857216SAndreas Gruenbacher switch (pi->cmd) { 2386b411b363SPhilipp Reisner case P_DATA_REQUEST: 2387db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_data_req; 2388b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 238980a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 239080a40e43SLars Ellenberg goto submit; 239180a40e43SLars Ellenberg 2392b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2393db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_rsdata_req; 2394b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 23955f9915bbSLars Ellenberg /* used in the sector offset progress display */ 23965f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2397b411b363SPhilipp Reisner break; 2398b411b363SPhilipp Reisner 2399b411b363SPhilipp Reisner case P_OV_REPLY: 2400b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2401b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2402e2857216SAndreas Gruenbacher di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); 2403b411b363SPhilipp Reisner if (!di) 2404b411b363SPhilipp Reisner goto out_free_e; 2405b411b363SPhilipp Reisner 2406e2857216SAndreas Gruenbacher di->digest_size = pi->size; 2407b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2408b411b363SPhilipp Reisner 2409db830c46SAndreas Gruenbacher peer_req->digest = di; 2410db830c46SAndreas Gruenbacher peer_req->flags |= EE_HAS_DIGEST; 2411c36c3cedSLars Ellenberg 2412e2857216SAndreas Gruenbacher if (drbd_recv_all(mdev->tconn, di->digest, pi->size)) 2413b411b363SPhilipp Reisner goto out_free_e; 2414b411b363SPhilipp Reisner 2415e2857216SAndreas Gruenbacher if (pi->cmd == P_CSUM_RS_REQUEST) { 241631890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 2417db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_csum_rs_req; 24185f9915bbSLars Ellenberg /* used in the sector offset progress display */ 24195f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2420e2857216SAndreas Gruenbacher } else if (pi->cmd == P_OV_REPLY) { 24212649f080SLars Ellenberg /* track progress, we may need to throttle */ 24222649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2423db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_reply; 2424b411b363SPhilipp Reisner dec_rs_pending(mdev); 24250f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 24260f0601f4SLars Ellenberg * but accounting still needs to be done. */ 24270f0601f4SLars Ellenberg goto submit_for_resync; 2428b411b363SPhilipp Reisner } 2429b411b363SPhilipp Reisner break; 2430b411b363SPhilipp Reisner 2431b411b363SPhilipp Reisner case P_OV_REQUEST: 2432b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 243331890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90) { 2434de228bbaSLars Ellenberg unsigned long now = jiffies; 2435de228bbaSLars Ellenberg int i; 2436b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2437b411b363SPhilipp Reisner mdev->ov_position = sector; 243830b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 243930b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2440de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2441de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2442de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2443de228bbaSLars Ellenberg } 2444b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2445b411b363SPhilipp Reisner (unsigned long long)sector); 2446b411b363SPhilipp Reisner } 2447db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_req; 2448b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2449b411b363SPhilipp Reisner break; 2450b411b363SPhilipp Reisner 2451b411b363SPhilipp Reisner default: 245249ba9b1bSAndreas Gruenbacher BUG(); 2453b411b363SPhilipp Reisner } 2454b411b363SPhilipp Reisner 24550f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 24560f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 24570f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 24580f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 24590f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 24600f0601f4SLars Ellenberg * 24610f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 24620f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 24630f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 24640f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 24650f0601f4SLars Ellenberg * a while, anyways. 24660f0601f4SLars Ellenberg */ 2467b411b363SPhilipp Reisner 24680f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 24690f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 24700f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 24710f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 24720f0601f4SLars Ellenberg * 24730f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 24740f0601f4SLars Ellenberg * we would also throttle its application reads. 24750f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 24760f0601f4SLars Ellenberg */ 2477e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2478e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2479e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 248080a40e43SLars Ellenberg goto out_free_e; 2481b411b363SPhilipp Reisner 24820f0601f4SLars Ellenberg submit_for_resync: 24830f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 24840f0601f4SLars Ellenberg 248580a40e43SLars Ellenberg submit: 2486b411b363SPhilipp Reisner inc_unacked(mdev); 248787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2488db830c46SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->read_ee); 248987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2490b411b363SPhilipp Reisner 2491fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0) 249282bc0194SAndreas Gruenbacher return 0; 2493b411b363SPhilipp Reisner 249410f6d992SLars Ellenberg /* don't care for the reason here */ 249510f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 249687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2497db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 249887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 249922cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 250022cc37a9SLars Ellenberg 2501b411b363SPhilipp Reisner out_free_e: 2502b411b363SPhilipp Reisner put_ldev(mdev); 25033967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 250482bc0194SAndreas Gruenbacher return -EIO; 2505b411b363SPhilipp Reisner } 2506b411b363SPhilipp Reisner 2507b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2508b411b363SPhilipp Reisner { 2509b411b363SPhilipp Reisner int self, peer, rv = -100; 2510b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 251144ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_0p; 2512b411b363SPhilipp Reisner 2513b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2514b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2515b411b363SPhilipp Reisner 2516b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2517b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2518b411b363SPhilipp Reisner 251944ed167dSPhilipp Reisner rcu_read_lock(); 252044ed167dSPhilipp Reisner after_sb_0p = rcu_dereference(mdev->tconn->net_conf)->after_sb_0p; 252144ed167dSPhilipp Reisner rcu_read_unlock(); 252244ed167dSPhilipp Reisner switch (after_sb_0p) { 2523b411b363SPhilipp Reisner case ASB_CONSENSUS: 2524b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2525b411b363SPhilipp Reisner case ASB_CALL_HELPER: 252644ed167dSPhilipp Reisner case ASB_VIOLENTLY: 2527b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2528b411b363SPhilipp Reisner break; 2529b411b363SPhilipp Reisner case ASB_DISCONNECT: 2530b411b363SPhilipp Reisner break; 2531b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2532b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2533b411b363SPhilipp Reisner rv = -1; 2534b411b363SPhilipp Reisner break; 2535b411b363SPhilipp Reisner } 2536b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2537b411b363SPhilipp Reisner rv = 1; 2538b411b363SPhilipp Reisner break; 2539b411b363SPhilipp Reisner } 2540b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2541b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2542b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2543b411b363SPhilipp Reisner rv = 1; 2544b411b363SPhilipp Reisner break; 2545b411b363SPhilipp Reisner } 2546b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2547b411b363SPhilipp Reisner rv = -1; 2548b411b363SPhilipp Reisner break; 2549b411b363SPhilipp Reisner } 2550b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2551ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2552b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2553b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2554b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 255525703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2556b411b363SPhilipp Reisner ? -1 : 1; 2557b411b363SPhilipp Reisner break; 2558b411b363SPhilipp Reisner } else { 2559b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2560b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2561b411b363SPhilipp Reisner } 256244ed167dSPhilipp Reisner if (after_sb_0p == ASB_DISCARD_ZERO_CHG) 2563b411b363SPhilipp Reisner break; 2564b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2565b411b363SPhilipp Reisner if (ch_self < ch_peer) 2566b411b363SPhilipp Reisner rv = -1; 2567b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2568b411b363SPhilipp Reisner rv = 1; 2569b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2570b411b363SPhilipp Reisner /* Well, then use something else. */ 257125703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2572b411b363SPhilipp Reisner ? -1 : 1; 2573b411b363SPhilipp Reisner break; 2574b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2575b411b363SPhilipp Reisner rv = -1; 2576b411b363SPhilipp Reisner break; 2577b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2578b411b363SPhilipp Reisner rv = 1; 2579b411b363SPhilipp Reisner } 2580b411b363SPhilipp Reisner 2581b411b363SPhilipp Reisner return rv; 2582b411b363SPhilipp Reisner } 2583b411b363SPhilipp Reisner 2584b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2585b411b363SPhilipp Reisner { 25866184ea21SAndreas Gruenbacher int hg, rv = -100; 258744ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_1p; 2588b411b363SPhilipp Reisner 258944ed167dSPhilipp Reisner rcu_read_lock(); 259044ed167dSPhilipp Reisner after_sb_1p = rcu_dereference(mdev->tconn->net_conf)->after_sb_1p; 259144ed167dSPhilipp Reisner rcu_read_unlock(); 259244ed167dSPhilipp Reisner switch (after_sb_1p) { 2593b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2594b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2595b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2596b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2597b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 259844ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2599b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2600b411b363SPhilipp Reisner break; 2601b411b363SPhilipp Reisner case ASB_DISCONNECT: 2602b411b363SPhilipp Reisner break; 2603b411b363SPhilipp Reisner case ASB_CONSENSUS: 2604b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2605b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2606b411b363SPhilipp Reisner rv = hg; 2607b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2608b411b363SPhilipp Reisner rv = hg; 2609b411b363SPhilipp Reisner break; 2610b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2611b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2612b411b363SPhilipp Reisner break; 2613b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2614b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2615b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2616b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2617b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2618bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2619bb437946SAndreas Gruenbacher 2620bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2621b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2622b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2623b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2624bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2625bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2626b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2627b411b363SPhilipp Reisner } else { 2628b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2629b411b363SPhilipp Reisner rv = hg; 2630b411b363SPhilipp Reisner } 2631b411b363SPhilipp Reisner } else 2632b411b363SPhilipp Reisner rv = hg; 2633b411b363SPhilipp Reisner } 2634b411b363SPhilipp Reisner 2635b411b363SPhilipp Reisner return rv; 2636b411b363SPhilipp Reisner } 2637b411b363SPhilipp Reisner 2638b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2639b411b363SPhilipp Reisner { 26406184ea21SAndreas Gruenbacher int hg, rv = -100; 264144ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_2p; 2642b411b363SPhilipp Reisner 264344ed167dSPhilipp Reisner rcu_read_lock(); 264444ed167dSPhilipp Reisner after_sb_2p = rcu_dereference(mdev->tconn->net_conf)->after_sb_2p; 264544ed167dSPhilipp Reisner rcu_read_unlock(); 264644ed167dSPhilipp Reisner switch (after_sb_2p) { 2647b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2648b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2649b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2650b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2651b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2652b411b363SPhilipp Reisner case ASB_CONSENSUS: 2653b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 265444ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2655b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2656b411b363SPhilipp Reisner break; 2657b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2658b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2659b411b363SPhilipp Reisner break; 2660b411b363SPhilipp Reisner case ASB_DISCONNECT: 2661b411b363SPhilipp Reisner break; 2662b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2663b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2664b411b363SPhilipp Reisner if (hg == -1) { 2665bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2666bb437946SAndreas Gruenbacher 2667b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2668b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2669b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2670bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2671bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2672b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2673b411b363SPhilipp Reisner } else { 2674b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2675b411b363SPhilipp Reisner rv = hg; 2676b411b363SPhilipp Reisner } 2677b411b363SPhilipp Reisner } else 2678b411b363SPhilipp Reisner rv = hg; 2679b411b363SPhilipp Reisner } 2680b411b363SPhilipp Reisner 2681b411b363SPhilipp Reisner return rv; 2682b411b363SPhilipp Reisner } 2683b411b363SPhilipp Reisner 2684b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2685b411b363SPhilipp Reisner u64 bits, u64 flags) 2686b411b363SPhilipp Reisner { 2687b411b363SPhilipp Reisner if (!uuid) { 2688b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2689b411b363SPhilipp Reisner return; 2690b411b363SPhilipp Reisner } 2691b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2692b411b363SPhilipp Reisner text, 2693b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2694b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2695b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2696b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2697b411b363SPhilipp Reisner (unsigned long long)bits, 2698b411b363SPhilipp Reisner (unsigned long long)flags); 2699b411b363SPhilipp Reisner } 2700b411b363SPhilipp Reisner 2701b411b363SPhilipp Reisner /* 2702b411b363SPhilipp Reisner 100 after split brain try auto recover 2703b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2704b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2705b411b363SPhilipp Reisner 0 no Sync 2706b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2707b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2708b411b363SPhilipp Reisner -100 after split brain, disconnect 2709b411b363SPhilipp Reisner -1000 unrelated data 27104a23f264SPhilipp Reisner -1091 requires proto 91 27114a23f264SPhilipp Reisner -1096 requires proto 96 2712b411b363SPhilipp Reisner */ 2713b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2714b411b363SPhilipp Reisner { 2715b411b363SPhilipp Reisner u64 self, peer; 2716b411b363SPhilipp Reisner int i, j; 2717b411b363SPhilipp Reisner 2718b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2719b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2720b411b363SPhilipp Reisner 2721b411b363SPhilipp Reisner *rule_nr = 10; 2722b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2723b411b363SPhilipp Reisner return 0; 2724b411b363SPhilipp Reisner 2725b411b363SPhilipp Reisner *rule_nr = 20; 2726b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2727b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2728b411b363SPhilipp Reisner return -2; 2729b411b363SPhilipp Reisner 2730b411b363SPhilipp Reisner *rule_nr = 30; 2731b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2732b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2733b411b363SPhilipp Reisner return 2; 2734b411b363SPhilipp Reisner 2735b411b363SPhilipp Reisner if (self == peer) { 2736b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2737b411b363SPhilipp Reisner 2738b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2739b411b363SPhilipp Reisner 274031890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27414a23f264SPhilipp Reisner return -1091; 2742b411b363SPhilipp Reisner 2743b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2744b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2745b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2746b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2747b411b363SPhilipp Reisner 2748b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2749b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2750b411b363SPhilipp Reisner *rule_nr = 34; 2751b411b363SPhilipp Reisner } else { 2752b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2753b411b363SPhilipp Reisner *rule_nr = 36; 2754b411b363SPhilipp Reisner } 2755b411b363SPhilipp Reisner 2756b411b363SPhilipp Reisner return 1; 2757b411b363SPhilipp Reisner } 2758b411b363SPhilipp Reisner 2759b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2760b411b363SPhilipp Reisner 276131890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27624a23f264SPhilipp Reisner return -1091; 2763b411b363SPhilipp Reisner 2764b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2765b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2766b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2767b411b363SPhilipp Reisner 2768b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2769b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2770b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2771b411b363SPhilipp Reisner 2772b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2773b411b363SPhilipp Reisner *rule_nr = 35; 2774b411b363SPhilipp Reisner } else { 2775b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2776b411b363SPhilipp Reisner *rule_nr = 37; 2777b411b363SPhilipp Reisner } 2778b411b363SPhilipp Reisner 2779b411b363SPhilipp Reisner return -1; 2780b411b363SPhilipp Reisner } 2781b411b363SPhilipp Reisner 2782b411b363SPhilipp Reisner /* Common power [off|failure] */ 2783b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2784b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2785b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2786b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2787b411b363SPhilipp Reisner *rule_nr = 40; 2788b411b363SPhilipp Reisner 2789b411b363SPhilipp Reisner switch (rct) { 2790b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2791b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2792b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2793b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 279425703f83SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 2795b411b363SPhilipp Reisner return dc ? -1 : 1; 2796b411b363SPhilipp Reisner } 2797b411b363SPhilipp Reisner } 2798b411b363SPhilipp Reisner 2799b411b363SPhilipp Reisner *rule_nr = 50; 2800b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2801b411b363SPhilipp Reisner if (self == peer) 2802b411b363SPhilipp Reisner return -1; 2803b411b363SPhilipp Reisner 2804b411b363SPhilipp Reisner *rule_nr = 51; 2805b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2806b411b363SPhilipp Reisner if (self == peer) { 280731890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 28084a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 28094a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 28104a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2811b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2812b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2813b411b363SPhilipp Reisner 281431890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 28154a23f264SPhilipp Reisner return -1091; 2816b411b363SPhilipp Reisner 2817b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2818b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 28194a23f264SPhilipp Reisner 28204a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 28214a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 28224a23f264SPhilipp Reisner 2823b411b363SPhilipp Reisner return -1; 2824b411b363SPhilipp Reisner } 2825b411b363SPhilipp Reisner } 2826b411b363SPhilipp Reisner 2827b411b363SPhilipp Reisner *rule_nr = 60; 2828b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2829b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2830b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2831b411b363SPhilipp Reisner if (self == peer) 2832b411b363SPhilipp Reisner return -2; 2833b411b363SPhilipp Reisner } 2834b411b363SPhilipp Reisner 2835b411b363SPhilipp Reisner *rule_nr = 70; 2836b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2837b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2838b411b363SPhilipp Reisner if (self == peer) 2839b411b363SPhilipp Reisner return 1; 2840b411b363SPhilipp Reisner 2841b411b363SPhilipp Reisner *rule_nr = 71; 2842b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2843b411b363SPhilipp Reisner if (self == peer) { 284431890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 28454a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 28464a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 28474a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2848b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2849b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2850b411b363SPhilipp Reisner 285131890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 28524a23f264SPhilipp Reisner return -1091; 2853b411b363SPhilipp Reisner 2854b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2855b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2856b411b363SPhilipp Reisner 28574a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2858b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2859b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2860b411b363SPhilipp Reisner 2861b411b363SPhilipp Reisner return 1; 2862b411b363SPhilipp Reisner } 2863b411b363SPhilipp Reisner } 2864b411b363SPhilipp Reisner 2865b411b363SPhilipp Reisner 2866b411b363SPhilipp Reisner *rule_nr = 80; 2867d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2868b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2869b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2870b411b363SPhilipp Reisner if (self == peer) 2871b411b363SPhilipp Reisner return 2; 2872b411b363SPhilipp Reisner } 2873b411b363SPhilipp Reisner 2874b411b363SPhilipp Reisner *rule_nr = 90; 2875b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2876b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2877b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2878b411b363SPhilipp Reisner return 100; 2879b411b363SPhilipp Reisner 2880b411b363SPhilipp Reisner *rule_nr = 100; 2881b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2882b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2883b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2884b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2885b411b363SPhilipp Reisner if (self == peer) 2886b411b363SPhilipp Reisner return -100; 2887b411b363SPhilipp Reisner } 2888b411b363SPhilipp Reisner } 2889b411b363SPhilipp Reisner 2890b411b363SPhilipp Reisner return -1000; 2891b411b363SPhilipp Reisner } 2892b411b363SPhilipp Reisner 2893b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2894b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2895b411b363SPhilipp Reisner */ 2896b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2897b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2898b411b363SPhilipp Reisner { 2899b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2900b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 290144ed167dSPhilipp Reisner struct net_conf *nc; 29026dff2902SAndreas Gruenbacher int hg, rule_nr, rr_conflict, tentative; 2903b411b363SPhilipp Reisner 2904b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2905b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2906b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2907b411b363SPhilipp Reisner 2908b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2909b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2910b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2911b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2912b411b363SPhilipp Reisner 2913b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2914b411b363SPhilipp Reisner 2915b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2916b411b363SPhilipp Reisner 2917b411b363SPhilipp Reisner if (hg == -1000) { 2918b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2919b411b363SPhilipp Reisner return C_MASK; 2920b411b363SPhilipp Reisner } 29214a23f264SPhilipp Reisner if (hg < -1000) { 29224a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2923b411b363SPhilipp Reisner return C_MASK; 2924b411b363SPhilipp Reisner } 2925b411b363SPhilipp Reisner 2926b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2927b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2928b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2929b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2930b411b363SPhilipp Reisner if (f) 2931b411b363SPhilipp Reisner hg = hg*2; 2932b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2933b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2934b411b363SPhilipp Reisner } 2935b411b363SPhilipp Reisner 29363a11a487SAdam Gandelman if (abs(hg) == 100) 29373a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 29383a11a487SAdam Gandelman 293944ed167dSPhilipp Reisner rcu_read_lock(); 294044ed167dSPhilipp Reisner nc = rcu_dereference(mdev->tconn->net_conf); 294144ed167dSPhilipp Reisner 294244ed167dSPhilipp Reisner if (hg == 100 || (hg == -100 && nc->always_asbp)) { 2943b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2944b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2945b411b363SPhilipp Reisner int forced = (hg == -100); 2946b411b363SPhilipp Reisner 2947b411b363SPhilipp Reisner switch (pcount) { 2948b411b363SPhilipp Reisner case 0: 2949b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2950b411b363SPhilipp Reisner break; 2951b411b363SPhilipp Reisner case 1: 2952b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2953b411b363SPhilipp Reisner break; 2954b411b363SPhilipp Reisner case 2: 2955b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2956b411b363SPhilipp Reisner break; 2957b411b363SPhilipp Reisner } 2958b411b363SPhilipp Reisner if (abs(hg) < 100) { 2959b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2960b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2961b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2962b411b363SPhilipp Reisner if (forced) { 2963b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2964b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2965b411b363SPhilipp Reisner hg = hg*2; 2966b411b363SPhilipp Reisner } 2967b411b363SPhilipp Reisner } 2968b411b363SPhilipp Reisner } 2969b411b363SPhilipp Reisner 2970b411b363SPhilipp Reisner if (hg == -100) { 297108b165baSPhilipp Reisner if (test_bit(DISCARD_MY_DATA, &mdev->flags) && !(mdev->p_uuid[UI_FLAGS]&1)) 2972b411b363SPhilipp Reisner hg = -1; 297308b165baSPhilipp Reisner if (!test_bit(DISCARD_MY_DATA, &mdev->flags) && (mdev->p_uuid[UI_FLAGS]&1)) 2974b411b363SPhilipp Reisner hg = 1; 2975b411b363SPhilipp Reisner 2976b411b363SPhilipp Reisner if (abs(hg) < 100) 2977b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2978b411b363SPhilipp Reisner "Sync from %s node\n", 2979b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2980b411b363SPhilipp Reisner } 298144ed167dSPhilipp Reisner rr_conflict = nc->rr_conflict; 29826dff2902SAndreas Gruenbacher tentative = nc->tentative; 298344ed167dSPhilipp Reisner rcu_read_unlock(); 2984b411b363SPhilipp Reisner 2985b411b363SPhilipp Reisner if (hg == -100) { 2986580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2987580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2988580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2989580b9767SLars Ellenberg * to that disk, in a way... */ 29903a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2991b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2992b411b363SPhilipp Reisner return C_MASK; 2993b411b363SPhilipp Reisner } 2994b411b363SPhilipp Reisner 2995b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2996b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2997b411b363SPhilipp Reisner return C_MASK; 2998b411b363SPhilipp Reisner } 2999b411b363SPhilipp Reisner 3000b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 3001b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 300244ed167dSPhilipp Reisner switch (rr_conflict) { 3003b411b363SPhilipp Reisner case ASB_CALL_HELPER: 3004b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 3005b411b363SPhilipp Reisner /* fall through */ 3006b411b363SPhilipp Reisner case ASB_DISCONNECT: 3007b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 3008b411b363SPhilipp Reisner return C_MASK; 3009b411b363SPhilipp Reisner case ASB_VIOLENTLY: 3010b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 3011b411b363SPhilipp Reisner "assumption\n"); 3012b411b363SPhilipp Reisner } 3013b411b363SPhilipp Reisner } 3014b411b363SPhilipp Reisner 30156dff2902SAndreas Gruenbacher if (tentative || test_bit(CONN_DRY_RUN, &mdev->tconn->flags)) { 3016cf14c2e9SPhilipp Reisner if (hg == 0) 3017cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 3018cf14c2e9SPhilipp Reisner else 3019cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 3020cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 3021cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 3022cf14c2e9SPhilipp Reisner return C_MASK; 3023cf14c2e9SPhilipp Reisner } 3024cf14c2e9SPhilipp Reisner 3025b411b363SPhilipp Reisner if (abs(hg) >= 2) { 3026b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 302720ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 302820ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 3029b411b363SPhilipp Reisner return C_MASK; 3030b411b363SPhilipp Reisner } 3031b411b363SPhilipp Reisner 3032b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 3033b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 3034b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 3035b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 3036b411b363SPhilipp Reisner } else { 3037b411b363SPhilipp Reisner rv = C_CONNECTED; 3038b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 3039b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 3040b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 3041b411b363SPhilipp Reisner } 3042b411b363SPhilipp Reisner } 3043b411b363SPhilipp Reisner 3044b411b363SPhilipp Reisner return rv; 3045b411b363SPhilipp Reisner } 3046b411b363SPhilipp Reisner 3047f179d76dSPhilipp Reisner static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) 3048b411b363SPhilipp Reisner { 3049b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 3050f179d76dSPhilipp Reisner if (peer == ASB_DISCARD_REMOTE) 3051f179d76dSPhilipp Reisner return ASB_DISCARD_LOCAL; 3052b411b363SPhilipp Reisner 3053b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 3054f179d76dSPhilipp Reisner if (peer == ASB_DISCARD_LOCAL) 3055f179d76dSPhilipp Reisner return ASB_DISCARD_REMOTE; 3056b411b363SPhilipp Reisner 3057b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 3058f179d76dSPhilipp Reisner return peer; 3059b411b363SPhilipp Reisner } 3060b411b363SPhilipp Reisner 3061e2857216SAndreas Gruenbacher static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi) 3062b411b363SPhilipp Reisner { 3063e658983aSAndreas Gruenbacher struct p_protocol *p = pi->data; 3064036b17eaSPhilipp Reisner enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 3065036b17eaSPhilipp Reisner int p_proto, p_discard_my_data, p_two_primaries, cf; 3066036b17eaSPhilipp Reisner struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; 3067036b17eaSPhilipp Reisner char integrity_alg[SHARED_SECRET_MAX] = ""; 3068accdbcc5SAndreas Gruenbacher struct crypto_hash *peer_integrity_tfm = NULL; 30697aca6c75SPhilipp Reisner void *int_dig_in = NULL, *int_dig_vv = NULL; 3070b411b363SPhilipp Reisner 3071b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 3072b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 3073b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 3074b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 3075b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 3076cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 30776139f60dSAndreas Gruenbacher p_discard_my_data = cf & CF_DISCARD_MY_DATA; 3078cf14c2e9SPhilipp Reisner 307986db0618SAndreas Gruenbacher if (tconn->agreed_pro_version >= 87) { 308086db0618SAndreas Gruenbacher int err; 308186db0618SAndreas Gruenbacher 308288104ca4SAndreas Gruenbacher if (pi->size > sizeof(integrity_alg)) 308386db0618SAndreas Gruenbacher return -EIO; 308488104ca4SAndreas Gruenbacher err = drbd_recv_all(tconn, integrity_alg, pi->size); 308586db0618SAndreas Gruenbacher if (err) 308686db0618SAndreas Gruenbacher return err; 308788104ca4SAndreas Gruenbacher integrity_alg[SHARED_SECRET_MAX - 1] = 0; 3088036b17eaSPhilipp Reisner } 308986db0618SAndreas Gruenbacher 30907d4c782cSAndreas Gruenbacher if (pi->cmd != P_PROTOCOL_UPDATE) { 30917204624cSPhilipp Reisner clear_bit(CONN_DRY_RUN, &tconn->flags); 3092cf14c2e9SPhilipp Reisner 3093cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 30947204624cSPhilipp Reisner set_bit(CONN_DRY_RUN, &tconn->flags); 3095b411b363SPhilipp Reisner 309644ed167dSPhilipp Reisner rcu_read_lock(); 309744ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 309844ed167dSPhilipp Reisner 3099036b17eaSPhilipp Reisner if (p_proto != nc->wire_protocol) { 3100d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "protocol"); 310144ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3102b411b363SPhilipp Reisner } 3103b411b363SPhilipp Reisner 3104f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { 3105d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "after-sb-0pri"); 310644ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3107b411b363SPhilipp Reisner } 3108b411b363SPhilipp Reisner 3109f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { 3110d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "after-sb-1pri"); 311144ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3112b411b363SPhilipp Reisner } 3113b411b363SPhilipp Reisner 3114f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { 3115d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "after-sb-2pri"); 311644ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3117b411b363SPhilipp Reisner } 3118b411b363SPhilipp Reisner 31196139f60dSAndreas Gruenbacher if (p_discard_my_data && nc->discard_my_data) { 3120d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "discard-my-data"); 312144ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3122b411b363SPhilipp Reisner } 3123b411b363SPhilipp Reisner 312444ed167dSPhilipp Reisner if (p_two_primaries != nc->two_primaries) { 3125d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "allow-two-primaries"); 312644ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3127b411b363SPhilipp Reisner } 3128b411b363SPhilipp Reisner 3129036b17eaSPhilipp Reisner if (strcmp(integrity_alg, nc->integrity_alg)) { 3130d505d9beSAndreas Gruenbacher conn_err(tconn, "incompatible %s settings\n", "data-integrity-alg"); 3131036b17eaSPhilipp Reisner goto disconnect_rcu_unlock; 3132036b17eaSPhilipp Reisner } 3133036b17eaSPhilipp Reisner 313486db0618SAndreas Gruenbacher rcu_read_unlock(); 3135fbc12f45SAndreas Gruenbacher } 31367d4c782cSAndreas Gruenbacher 31377d4c782cSAndreas Gruenbacher if (integrity_alg[0]) { 31387d4c782cSAndreas Gruenbacher int hash_size; 31397d4c782cSAndreas Gruenbacher 31407d4c782cSAndreas Gruenbacher /* 31417d4c782cSAndreas Gruenbacher * We can only change the peer data integrity algorithm 31427d4c782cSAndreas Gruenbacher * here. Changing our own data integrity algorithm 31437d4c782cSAndreas Gruenbacher * requires that we send a P_PROTOCOL_UPDATE packet at 31447d4c782cSAndreas Gruenbacher * the same time; otherwise, the peer has no way to 31457d4c782cSAndreas Gruenbacher * tell between which packets the algorithm should 31467d4c782cSAndreas Gruenbacher * change. 31477d4c782cSAndreas Gruenbacher */ 31487d4c782cSAndreas Gruenbacher 31497d4c782cSAndreas Gruenbacher peer_integrity_tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC); 31507d4c782cSAndreas Gruenbacher if (!peer_integrity_tfm) { 31517d4c782cSAndreas Gruenbacher conn_err(tconn, "peer data-integrity-alg %s not supported\n", 31527d4c782cSAndreas Gruenbacher integrity_alg); 31537d4c782cSAndreas Gruenbacher goto disconnect; 31547d4c782cSAndreas Gruenbacher } 31557d4c782cSAndreas Gruenbacher 31567d4c782cSAndreas Gruenbacher hash_size = crypto_hash_digestsize(peer_integrity_tfm); 31577d4c782cSAndreas Gruenbacher int_dig_in = kmalloc(hash_size, GFP_KERNEL); 31587d4c782cSAndreas Gruenbacher int_dig_vv = kmalloc(hash_size, GFP_KERNEL); 31597d4c782cSAndreas Gruenbacher if (!(int_dig_in && int_dig_vv)) { 31607d4c782cSAndreas Gruenbacher conn_err(tconn, "Allocation of buffers for data integrity checking failed\n"); 31617d4c782cSAndreas Gruenbacher goto disconnect; 31627d4c782cSAndreas Gruenbacher } 31637d4c782cSAndreas Gruenbacher } 31647d4c782cSAndreas Gruenbacher 31657d4c782cSAndreas Gruenbacher new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); 31667d4c782cSAndreas Gruenbacher if (!new_net_conf) { 31677d4c782cSAndreas Gruenbacher conn_err(tconn, "Allocation of new net_conf failed\n"); 31687d4c782cSAndreas Gruenbacher goto disconnect; 31697d4c782cSAndreas Gruenbacher } 31707d4c782cSAndreas Gruenbacher 31717d4c782cSAndreas Gruenbacher mutex_lock(&tconn->data.mutex); 31727d4c782cSAndreas Gruenbacher mutex_lock(&tconn->conf_update); 31737d4c782cSAndreas Gruenbacher old_net_conf = tconn->net_conf; 31747d4c782cSAndreas Gruenbacher *new_net_conf = *old_net_conf; 31757d4c782cSAndreas Gruenbacher 31767d4c782cSAndreas Gruenbacher new_net_conf->wire_protocol = p_proto; 31777d4c782cSAndreas Gruenbacher new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); 31787d4c782cSAndreas Gruenbacher new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); 31797d4c782cSAndreas Gruenbacher new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); 31807d4c782cSAndreas Gruenbacher new_net_conf->two_primaries = p_two_primaries; 31817d4c782cSAndreas Gruenbacher 31827d4c782cSAndreas Gruenbacher rcu_assign_pointer(tconn->net_conf, new_net_conf); 31837d4c782cSAndreas Gruenbacher mutex_unlock(&tconn->conf_update); 31847d4c782cSAndreas Gruenbacher mutex_unlock(&tconn->data.mutex); 31857d4c782cSAndreas Gruenbacher 31867d4c782cSAndreas Gruenbacher crypto_free_hash(tconn->peer_integrity_tfm); 31877d4c782cSAndreas Gruenbacher kfree(tconn->int_dig_in); 31887d4c782cSAndreas Gruenbacher kfree(tconn->int_dig_vv); 31897d4c782cSAndreas Gruenbacher tconn->peer_integrity_tfm = peer_integrity_tfm; 31907d4c782cSAndreas Gruenbacher tconn->int_dig_in = int_dig_in; 31917d4c782cSAndreas Gruenbacher tconn->int_dig_vv = int_dig_vv; 31927d4c782cSAndreas Gruenbacher 31937d4c782cSAndreas Gruenbacher if (strcmp(old_net_conf->integrity_alg, integrity_alg)) 31947d4c782cSAndreas Gruenbacher conn_info(tconn, "peer data-integrity-alg: %s\n", 31957d4c782cSAndreas Gruenbacher integrity_alg[0] ? integrity_alg : "(none)"); 31967d4c782cSAndreas Gruenbacher 31977d4c782cSAndreas Gruenbacher synchronize_rcu(); 31987d4c782cSAndreas Gruenbacher kfree(old_net_conf); 319982bc0194SAndreas Gruenbacher return 0; 3200b411b363SPhilipp Reisner 320144ed167dSPhilipp Reisner disconnect_rcu_unlock: 320244ed167dSPhilipp Reisner rcu_read_unlock(); 3203b411b363SPhilipp Reisner disconnect: 3204b792c35cSAndreas Gruenbacher crypto_free_hash(peer_integrity_tfm); 3205036b17eaSPhilipp Reisner kfree(int_dig_in); 3206036b17eaSPhilipp Reisner kfree(int_dig_vv); 32077204624cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 320882bc0194SAndreas Gruenbacher return -EIO; 3209b411b363SPhilipp Reisner } 3210b411b363SPhilipp Reisner 3211b411b363SPhilipp Reisner /* helper function 3212b411b363SPhilipp Reisner * input: alg name, feature name 3213b411b363SPhilipp Reisner * return: NULL (alg name was "") 3214b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 3215b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 3216b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 3217b411b363SPhilipp Reisner const char *alg, const char *name) 3218b411b363SPhilipp Reisner { 3219b411b363SPhilipp Reisner struct crypto_hash *tfm; 3220b411b363SPhilipp Reisner 3221b411b363SPhilipp Reisner if (!alg[0]) 3222b411b363SPhilipp Reisner return NULL; 3223b411b363SPhilipp Reisner 3224b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 3225b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 3226b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 3227b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 3228b411b363SPhilipp Reisner return tfm; 3229b411b363SPhilipp Reisner } 3230b411b363SPhilipp Reisner return tfm; 3231b411b363SPhilipp Reisner } 3232b411b363SPhilipp Reisner 32334a76b161SAndreas Gruenbacher static int ignore_remaining_packet(struct drbd_tconn *tconn, struct packet_info *pi) 3234b411b363SPhilipp Reisner { 32354a76b161SAndreas Gruenbacher void *buffer = tconn->data.rbuf; 32364a76b161SAndreas Gruenbacher int size = pi->size; 32374a76b161SAndreas Gruenbacher 32384a76b161SAndreas Gruenbacher while (size) { 32394a76b161SAndreas Gruenbacher int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); 32404a76b161SAndreas Gruenbacher s = drbd_recv(tconn, buffer, s); 32414a76b161SAndreas Gruenbacher if (s <= 0) { 32424a76b161SAndreas Gruenbacher if (s < 0) 32434a76b161SAndreas Gruenbacher return s; 32444a76b161SAndreas Gruenbacher break; 32454a76b161SAndreas Gruenbacher } 32464a76b161SAndreas Gruenbacher size -= s; 32474a76b161SAndreas Gruenbacher } 32484a76b161SAndreas Gruenbacher if (size) 32494a76b161SAndreas Gruenbacher return -EIO; 32504a76b161SAndreas Gruenbacher return 0; 32514a76b161SAndreas Gruenbacher } 32524a76b161SAndreas Gruenbacher 32534a76b161SAndreas Gruenbacher /* 32544a76b161SAndreas Gruenbacher * config_unknown_volume - device configuration command for unknown volume 32554a76b161SAndreas Gruenbacher * 32564a76b161SAndreas Gruenbacher * When a device is added to an existing connection, the node on which the 32574a76b161SAndreas Gruenbacher * device is added first will send configuration commands to its peer but the 32584a76b161SAndreas Gruenbacher * peer will not know about the device yet. It will warn and ignore these 32594a76b161SAndreas Gruenbacher * commands. Once the device is added on the second node, the second node will 32604a76b161SAndreas Gruenbacher * send the same device configuration commands, but in the other direction. 32614a76b161SAndreas Gruenbacher * 32624a76b161SAndreas Gruenbacher * (We can also end up here if drbd is misconfigured.) 32634a76b161SAndreas Gruenbacher */ 32644a76b161SAndreas Gruenbacher static int config_unknown_volume(struct drbd_tconn *tconn, struct packet_info *pi) 32654a76b161SAndreas Gruenbacher { 32662fcb8f30SAndreas Gruenbacher conn_warn(tconn, "%s packet received for volume %u, which is not configured locally\n", 32672fcb8f30SAndreas Gruenbacher cmdname(pi->cmd), pi->vnr); 32684a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 32694a76b161SAndreas Gruenbacher } 32704a76b161SAndreas Gruenbacher 32714a76b161SAndreas Gruenbacher static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi) 32724a76b161SAndreas Gruenbacher { 32734a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3274e658983aSAndreas Gruenbacher struct p_rs_param_95 *p; 3275b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 3276b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 3277b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 32782ec91e0eSPhilipp Reisner struct net_conf *old_net_conf, *new_net_conf = NULL; 3279813472ceSPhilipp Reisner struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; 32804a76b161SAndreas Gruenbacher const int apv = tconn->agreed_pro_version; 3281813472ceSPhilipp Reisner struct fifo_buffer *old_plan = NULL, *new_plan = NULL; 3282778f271dSPhilipp Reisner int fifo_size = 0; 328382bc0194SAndreas Gruenbacher int err; 3284b411b363SPhilipp Reisner 32854a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 32864a76b161SAndreas Gruenbacher if (!mdev) 32874a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 32884a76b161SAndreas Gruenbacher 3289b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 3290b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 3291b411b363SPhilipp Reisner + SHARED_SECRET_MAX 32928e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 32938e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 3294b411b363SPhilipp Reisner 3295e2857216SAndreas Gruenbacher if (pi->size > exp_max_sz) { 3296b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 3297e2857216SAndreas Gruenbacher pi->size, exp_max_sz); 329882bc0194SAndreas Gruenbacher return -EIO; 3299b411b363SPhilipp Reisner } 3300b411b363SPhilipp Reisner 3301b411b363SPhilipp Reisner if (apv <= 88) { 3302e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param); 3303e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 33048e26f9ccSPhilipp Reisner } else if (apv <= 94) { 3305e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_89); 3306e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3307b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 33088e26f9ccSPhilipp Reisner } else { 3309e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_95); 3310e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3311b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 3312b411b363SPhilipp Reisner } 3313b411b363SPhilipp Reisner 3314b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 3315e658983aSAndreas Gruenbacher p = pi->data; 3316b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 3317b411b363SPhilipp Reisner 3318e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, header_size); 331982bc0194SAndreas Gruenbacher if (err) 332082bc0194SAndreas Gruenbacher return err; 3321b411b363SPhilipp Reisner 3322813472ceSPhilipp Reisner mutex_lock(&mdev->tconn->conf_update); 3323813472ceSPhilipp Reisner old_net_conf = mdev->tconn->net_conf; 3324813472ceSPhilipp Reisner if (get_ldev(mdev)) { 3325daeda1ccSPhilipp Reisner new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); 3326daeda1ccSPhilipp Reisner if (!new_disk_conf) { 3327813472ceSPhilipp Reisner put_ldev(mdev); 3328813472ceSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3329daeda1ccSPhilipp Reisner dev_err(DEV, "Allocation of new disk_conf failed\n"); 3330daeda1ccSPhilipp Reisner return -ENOMEM; 3331f399002eSLars Ellenberg } 3332b411b363SPhilipp Reisner 3333daeda1ccSPhilipp Reisner old_disk_conf = mdev->ldev->disk_conf; 3334daeda1ccSPhilipp Reisner *new_disk_conf = *old_disk_conf; 3335daeda1ccSPhilipp Reisner 33366394b935SAndreas Gruenbacher new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); 3337813472ceSPhilipp Reisner } 3338daeda1ccSPhilipp Reisner 3339b411b363SPhilipp Reisner if (apv >= 88) { 3340b411b363SPhilipp Reisner if (apv == 88) { 3341b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 3342b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 3343b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 3344b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 3345813472ceSPhilipp Reisner err = -EIO; 3346813472ceSPhilipp Reisner goto reconnect; 3347b411b363SPhilipp Reisner } 3348b411b363SPhilipp Reisner 334982bc0194SAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size); 3350813472ceSPhilipp Reisner if (err) 3351813472ceSPhilipp Reisner goto reconnect; 3352b411b363SPhilipp Reisner /* we expect NUL terminated string */ 3353b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3354b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 3355b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 3356b411b363SPhilipp Reisner 3357b411b363SPhilipp Reisner } else /* apv >= 89 */ { 3358b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 3359b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3360b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 3361b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 3362b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 3363b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 3364b411b363SPhilipp Reisner } 3365b411b363SPhilipp Reisner 33662ec91e0eSPhilipp Reisner if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { 3367b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3368b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 33692ec91e0eSPhilipp Reisner old_net_conf->verify_alg, p->verify_alg); 3370b411b363SPhilipp Reisner goto disconnect; 3371b411b363SPhilipp Reisner } 3372b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 3373b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 3374b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 3375b411b363SPhilipp Reisner verify_tfm = NULL; 3376b411b363SPhilipp Reisner goto disconnect; 3377b411b363SPhilipp Reisner } 3378b411b363SPhilipp Reisner } 3379b411b363SPhilipp Reisner 33802ec91e0eSPhilipp Reisner if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { 3381b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3382b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 33832ec91e0eSPhilipp Reisner old_net_conf->csums_alg, p->csums_alg); 3384b411b363SPhilipp Reisner goto disconnect; 3385b411b363SPhilipp Reisner } 3386b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 3387b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 3388b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 3389b411b363SPhilipp Reisner csums_tfm = NULL; 3390b411b363SPhilipp Reisner goto disconnect; 3391b411b363SPhilipp Reisner } 3392b411b363SPhilipp Reisner } 3393b411b363SPhilipp Reisner 3394813472ceSPhilipp Reisner if (apv > 94 && new_disk_conf) { 3395daeda1ccSPhilipp Reisner new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 3396daeda1ccSPhilipp Reisner new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); 3397daeda1ccSPhilipp Reisner new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); 3398daeda1ccSPhilipp Reisner new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); 3399778f271dSPhilipp Reisner 3400daeda1ccSPhilipp Reisner fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; 34019958c857SPhilipp Reisner if (fifo_size != mdev->rs_plan_s->size) { 3402813472ceSPhilipp Reisner new_plan = fifo_alloc(fifo_size); 3403813472ceSPhilipp Reisner if (!new_plan) { 3404778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 3405f399002eSLars Ellenberg put_ldev(mdev); 3406778f271dSPhilipp Reisner goto disconnect; 3407778f271dSPhilipp Reisner } 3408778f271dSPhilipp Reisner } 34098e26f9ccSPhilipp Reisner } 3410b411b363SPhilipp Reisner 341191fd4dadSPhilipp Reisner if (verify_tfm || csums_tfm) { 34122ec91e0eSPhilipp Reisner new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 34132ec91e0eSPhilipp Reisner if (!new_net_conf) { 341491fd4dadSPhilipp Reisner dev_err(DEV, "Allocation of new net_conf failed\n"); 341591fd4dadSPhilipp Reisner goto disconnect; 341691fd4dadSPhilipp Reisner } 341791fd4dadSPhilipp Reisner 34182ec91e0eSPhilipp Reisner *new_net_conf = *old_net_conf; 341991fd4dadSPhilipp Reisner 3420b411b363SPhilipp Reisner if (verify_tfm) { 34212ec91e0eSPhilipp Reisner strcpy(new_net_conf->verify_alg, p->verify_alg); 34222ec91e0eSPhilipp Reisner new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; 3423f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->verify_tfm); 3424f399002eSLars Ellenberg mdev->tconn->verify_tfm = verify_tfm; 3425b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 3426b411b363SPhilipp Reisner } 3427b411b363SPhilipp Reisner if (csums_tfm) { 34282ec91e0eSPhilipp Reisner strcpy(new_net_conf->csums_alg, p->csums_alg); 34292ec91e0eSPhilipp Reisner new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; 3430f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->csums_tfm); 3431f399002eSLars Ellenberg mdev->tconn->csums_tfm = csums_tfm; 3432b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 3433b411b363SPhilipp Reisner } 34342ec91e0eSPhilipp Reisner rcu_assign_pointer(tconn->net_conf, new_net_conf); 343591fd4dadSPhilipp Reisner } 343691fd4dadSPhilipp Reisner } 343791fd4dadSPhilipp Reisner 3438813472ceSPhilipp Reisner if (new_disk_conf) { 3439daeda1ccSPhilipp Reisner rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); 3440813472ceSPhilipp Reisner put_ldev(mdev); 3441778f271dSPhilipp Reisner } 3442813472ceSPhilipp Reisner 3443813472ceSPhilipp Reisner if (new_plan) { 3444813472ceSPhilipp Reisner old_plan = mdev->rs_plan_s; 3445813472ceSPhilipp Reisner rcu_assign_pointer(mdev->rs_plan_s, new_plan); 3446813472ceSPhilipp Reisner } 3447daeda1ccSPhilipp Reisner 3448daeda1ccSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3449daeda1ccSPhilipp Reisner synchronize_rcu(); 3450daeda1ccSPhilipp Reisner if (new_net_conf) 3451daeda1ccSPhilipp Reisner kfree(old_net_conf); 3452daeda1ccSPhilipp Reisner kfree(old_disk_conf); 3453813472ceSPhilipp Reisner kfree(old_plan); 3454daeda1ccSPhilipp Reisner 345582bc0194SAndreas Gruenbacher return 0; 3456b411b363SPhilipp Reisner 3457813472ceSPhilipp Reisner reconnect: 3458813472ceSPhilipp Reisner if (new_disk_conf) { 3459813472ceSPhilipp Reisner put_ldev(mdev); 3460813472ceSPhilipp Reisner kfree(new_disk_conf); 3461813472ceSPhilipp Reisner } 3462813472ceSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3463813472ceSPhilipp Reisner return -EIO; 3464813472ceSPhilipp Reisner 3465b411b363SPhilipp Reisner disconnect: 3466813472ceSPhilipp Reisner kfree(new_plan); 3467813472ceSPhilipp Reisner if (new_disk_conf) { 3468813472ceSPhilipp Reisner put_ldev(mdev); 3469813472ceSPhilipp Reisner kfree(new_disk_conf); 3470813472ceSPhilipp Reisner } 3471a0095508SPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3472b411b363SPhilipp Reisner /* just for completeness: actually not needed, 3473b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 3474b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 3475b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 3476b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 347738fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 347882bc0194SAndreas Gruenbacher return -EIO; 3479b411b363SPhilipp Reisner } 3480b411b363SPhilipp Reisner 3481b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 3482b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 3483b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 3484b411b363SPhilipp Reisner { 3485b411b363SPhilipp Reisner sector_t d; 3486b411b363SPhilipp Reisner if (a == 0 || b == 0) 3487b411b363SPhilipp Reisner return; 3488b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 3489b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 3490b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 3491b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 3492b411b363SPhilipp Reisner } 3493b411b363SPhilipp Reisner 34944a76b161SAndreas Gruenbacher static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi) 3495b411b363SPhilipp Reisner { 34964a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3497e658983aSAndreas Gruenbacher struct p_sizes *p = pi->data; 3498b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 3499b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 3500b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 3501e89b591cSPhilipp Reisner enum dds_flags ddsf; 3502b411b363SPhilipp Reisner 35034a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 35044a76b161SAndreas Gruenbacher if (!mdev) 35054a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 35064a76b161SAndreas Gruenbacher 3507b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 3508b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 3509b411b363SPhilipp Reisner 3510b411b363SPhilipp Reisner /* just store the peer's disk size for now. 3511b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 3512b411b363SPhilipp Reisner mdev->p_size = p_size; 3513b411b363SPhilipp Reisner 3514b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3515daeda1ccSPhilipp Reisner rcu_read_lock(); 3516daeda1ccSPhilipp Reisner my_usize = rcu_dereference(mdev->ldev->disk_conf)->disk_size; 3517daeda1ccSPhilipp Reisner rcu_read_unlock(); 3518daeda1ccSPhilipp Reisner 3519b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 3520b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 3521b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 3522daeda1ccSPhilipp Reisner p_usize, my_usize); 3523b411b363SPhilipp Reisner 3524b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 3525b411b363SPhilipp Reisner * param exchange, choose the minimum */ 3526b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 3527daeda1ccSPhilipp Reisner p_usize = min_not_zero(my_usize, p_usize); 3528b411b363SPhilipp Reisner 3529b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3530b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3531ef5e44a6SPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, p_usize, 0) < 3532b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3533b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3534b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3535b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 353638fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 3537b411b363SPhilipp Reisner put_ldev(mdev); 353882bc0194SAndreas Gruenbacher return -EIO; 3539b411b363SPhilipp Reisner } 3540daeda1ccSPhilipp Reisner 3541daeda1ccSPhilipp Reisner if (my_usize != p_usize) { 3542daeda1ccSPhilipp Reisner struct disk_conf *old_disk_conf, *new_disk_conf = NULL; 3543daeda1ccSPhilipp Reisner 3544daeda1ccSPhilipp Reisner new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); 3545daeda1ccSPhilipp Reisner if (!new_disk_conf) { 3546daeda1ccSPhilipp Reisner dev_err(DEV, "Allocation of new disk_conf failed\n"); 3547daeda1ccSPhilipp Reisner put_ldev(mdev); 3548daeda1ccSPhilipp Reisner return -ENOMEM; 3549daeda1ccSPhilipp Reisner } 3550daeda1ccSPhilipp Reisner 3551daeda1ccSPhilipp Reisner mutex_lock(&mdev->tconn->conf_update); 3552daeda1ccSPhilipp Reisner old_disk_conf = mdev->ldev->disk_conf; 3553daeda1ccSPhilipp Reisner *new_disk_conf = *old_disk_conf; 3554daeda1ccSPhilipp Reisner new_disk_conf->disk_size = p_usize; 3555daeda1ccSPhilipp Reisner 3556daeda1ccSPhilipp Reisner rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); 3557daeda1ccSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3558daeda1ccSPhilipp Reisner synchronize_rcu(); 3559daeda1ccSPhilipp Reisner kfree(old_disk_conf); 3560daeda1ccSPhilipp Reisner 3561daeda1ccSPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3562daeda1ccSPhilipp Reisner (unsigned long)my_usize); 3563daeda1ccSPhilipp Reisner } 3564daeda1ccSPhilipp Reisner 3565b411b363SPhilipp Reisner put_ldev(mdev); 3566b411b363SPhilipp Reisner } 3567b411b363SPhilipp Reisner 3568e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3569b411b363SPhilipp Reisner if (get_ldev(mdev)) { 357024c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 3571b411b363SPhilipp Reisner put_ldev(mdev); 3572b411b363SPhilipp Reisner if (dd == dev_size_error) 357382bc0194SAndreas Gruenbacher return -EIO; 3574b411b363SPhilipp Reisner drbd_md_sync(mdev); 3575b411b363SPhilipp Reisner } else { 3576b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3577b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3578b411b363SPhilipp Reisner } 3579b411b363SPhilipp Reisner 358099432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 358199432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 358299432fccSPhilipp Reisner 3583b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3584b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3585b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3586b411b363SPhilipp Reisner ldsc = 1; 3587b411b363SPhilipp Reisner } 3588b411b363SPhilipp Reisner 3589b411b363SPhilipp Reisner put_ldev(mdev); 3590b411b363SPhilipp Reisner } 3591b411b363SPhilipp Reisner 3592b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3593b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3594b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3595b411b363SPhilipp Reisner /* we have different sizes, probably peer 3596b411b363SPhilipp Reisner * needs to know my new size... */ 3597e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3598b411b363SPhilipp Reisner } 3599b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3600b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3601b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3602e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3603e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3604e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3605b411b363SPhilipp Reisner else 3606e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3607e89b591cSPhilipp Reisner } else 3608b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3609b411b363SPhilipp Reisner } 3610b411b363SPhilipp Reisner } 3611b411b363SPhilipp Reisner 361282bc0194SAndreas Gruenbacher return 0; 3613b411b363SPhilipp Reisner } 3614b411b363SPhilipp Reisner 36154a76b161SAndreas Gruenbacher static int receive_uuids(struct drbd_tconn *tconn, struct packet_info *pi) 3616b411b363SPhilipp Reisner { 36174a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3618e658983aSAndreas Gruenbacher struct p_uuids *p = pi->data; 3619b411b363SPhilipp Reisner u64 *p_uuid; 362062b0da3aSLars Ellenberg int i, updated_uuids = 0; 3621b411b363SPhilipp Reisner 36224a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 36234a76b161SAndreas Gruenbacher if (!mdev) 36244a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 36254a76b161SAndreas Gruenbacher 3626b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3627b411b363SPhilipp Reisner 3628b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3629b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3630b411b363SPhilipp Reisner 3631b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3632b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3633b411b363SPhilipp Reisner 3634b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3635b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3636b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3637b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3638b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3639b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 364038fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 364182bc0194SAndreas Gruenbacher return -EIO; 3642b411b363SPhilipp Reisner } 3643b411b363SPhilipp Reisner 3644b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3645b411b363SPhilipp Reisner int skip_initial_sync = 3646b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 364731890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90 && 3648b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3649b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3650b411b363SPhilipp Reisner if (skip_initial_sync) { 3651b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3652b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 365320ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 365420ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3655b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3656b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3657b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3658b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3659b411b363SPhilipp Reisner drbd_md_sync(mdev); 366062b0da3aSLars Ellenberg updated_uuids = 1; 3661b411b363SPhilipp Reisner } 3662b411b363SPhilipp Reisner put_ldev(mdev); 366318a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 366418a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 366518a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 366618a50fa2SPhilipp Reisner for me. */ 366762b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3668b411b363SPhilipp Reisner } 3669b411b363SPhilipp Reisner 3670b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3671b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3672b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3673b411b363SPhilipp Reisner new disk state... */ 36748410da8fSPhilipp Reisner mutex_lock(mdev->state_mutex); 36758410da8fSPhilipp Reisner mutex_unlock(mdev->state_mutex); 3676b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 367762b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 367862b0da3aSLars Ellenberg 367962b0da3aSLars Ellenberg if (updated_uuids) 368062b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3681b411b363SPhilipp Reisner 368282bc0194SAndreas Gruenbacher return 0; 3683b411b363SPhilipp Reisner } 3684b411b363SPhilipp Reisner 3685b411b363SPhilipp Reisner /** 3686b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3687b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3688b411b363SPhilipp Reisner */ 3689b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3690b411b363SPhilipp Reisner { 3691b411b363SPhilipp Reisner union drbd_state ms; 3692b411b363SPhilipp Reisner 3693b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3694369bea63SPhilipp Reisner [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, 3695b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3696b411b363SPhilipp Reisner 3697b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3698b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3699b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3700b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3701b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3702b411b363SPhilipp Reisner }; 3703b411b363SPhilipp Reisner 3704b411b363SPhilipp Reisner ms.i = ps.i; 3705b411b363SPhilipp Reisner 3706b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3707b411b363SPhilipp Reisner ms.peer = ps.role; 3708b411b363SPhilipp Reisner ms.role = ps.peer; 3709b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3710b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3711b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3712b411b363SPhilipp Reisner 3713b411b363SPhilipp Reisner return ms; 3714b411b363SPhilipp Reisner } 3715b411b363SPhilipp Reisner 37164a76b161SAndreas Gruenbacher static int receive_req_state(struct drbd_tconn *tconn, struct packet_info *pi) 3717b411b363SPhilipp Reisner { 37184a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3719e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3720b411b363SPhilipp Reisner union drbd_state mask, val; 3721bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3722b411b363SPhilipp Reisner 37234a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 37244a76b161SAndreas Gruenbacher if (!mdev) 37254a76b161SAndreas Gruenbacher return -EIO; 37264a76b161SAndreas Gruenbacher 3727b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3728b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3729b411b363SPhilipp Reisner 373025703f83SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && 37318410da8fSPhilipp Reisner mutex_is_locked(mdev->state_mutex)) { 3732b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 373382bc0194SAndreas Gruenbacher return 0; 3734b411b363SPhilipp Reisner } 3735b411b363SPhilipp Reisner 3736b411b363SPhilipp Reisner mask = convert_state(mask); 3737b411b363SPhilipp Reisner val = convert_state(val); 3738b411b363SPhilipp Reisner 3739b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3740b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3741047cd4a6SPhilipp Reisner 3742b411b363SPhilipp Reisner drbd_md_sync(mdev); 3743b411b363SPhilipp Reisner 374482bc0194SAndreas Gruenbacher return 0; 3745b411b363SPhilipp Reisner } 3746b411b363SPhilipp Reisner 3747e2857216SAndreas Gruenbacher static int receive_req_conn_state(struct drbd_tconn *tconn, struct packet_info *pi) 3748dfafcc8aSPhilipp Reisner { 3749e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3750dfafcc8aSPhilipp Reisner union drbd_state mask, val; 3751dfafcc8aSPhilipp Reisner enum drbd_state_rv rv; 3752dfafcc8aSPhilipp Reisner 3753dfafcc8aSPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3754dfafcc8aSPhilipp Reisner val.i = be32_to_cpu(p->val); 3755dfafcc8aSPhilipp Reisner 3756dfafcc8aSPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &tconn->flags) && 3757dfafcc8aSPhilipp Reisner mutex_is_locked(&tconn->cstate_mutex)) { 3758dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG); 375982bc0194SAndreas Gruenbacher return 0; 3760dfafcc8aSPhilipp Reisner } 3761dfafcc8aSPhilipp Reisner 3762dfafcc8aSPhilipp Reisner mask = convert_state(mask); 3763dfafcc8aSPhilipp Reisner val = convert_state(val); 3764dfafcc8aSPhilipp Reisner 3765778bcf2eSPhilipp Reisner rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); 3766dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, rv); 3767dfafcc8aSPhilipp Reisner 376882bc0194SAndreas Gruenbacher return 0; 3769dfafcc8aSPhilipp Reisner } 3770dfafcc8aSPhilipp Reisner 37714a76b161SAndreas Gruenbacher static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi) 3772b411b363SPhilipp Reisner { 37734a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3774e658983aSAndreas Gruenbacher struct p_state *p = pi->data; 37754ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3776b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 377765d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3778b411b363SPhilipp Reisner int rv; 3779b411b363SPhilipp Reisner 37804a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 37814a76b161SAndreas Gruenbacher if (!mdev) 37824a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 37834a76b161SAndreas Gruenbacher 3784b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3785b411b363SPhilipp Reisner 3786b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3787b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3788b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3789b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3790b411b363SPhilipp Reisner } 3791b411b363SPhilipp Reisner 379287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3793b411b363SPhilipp Reisner retry: 379478bae59bSPhilipp Reisner os = ns = drbd_read_state(mdev); 379587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3796b411b363SPhilipp Reisner 3797b8853dbdSPhilipp Reisner /* If some other part of the code (asender thread, timeout) 3798b8853dbdSPhilipp Reisner * already decided to close the connection again, 3799b8853dbdSPhilipp Reisner * we must not "re-establish" it here. */ 3800b8853dbdSPhilipp Reisner if (os.conn <= C_TEAR_DOWN) 3801b8853dbdSPhilipp Reisner return false; 3802b8853dbdSPhilipp Reisner 38039bcd2521SPhilipp Reisner /* If this is the "end of sync" confirmation, usually the peer disk 38049bcd2521SPhilipp Reisner * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits 38059bcd2521SPhilipp Reisner * set) resync started in PausedSyncT, or if the timing of pause-/ 38069bcd2521SPhilipp Reisner * unpause-sync events has been "just right", the peer disk may 38079bcd2521SPhilipp Reisner * transition from D_CONSISTENT to D_UP_TO_DATE as well. 38089bcd2521SPhilipp Reisner */ 38099bcd2521SPhilipp Reisner if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && 38109bcd2521SPhilipp Reisner real_peer_disk == D_UP_TO_DATE && 3811e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3812e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3813e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3814e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3815e9ef7bb6SLars Ellenberg * syncing states. 3816e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3817e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3818e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3819e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3820e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3821e9ef7bb6SLars Ellenberg 3822e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3823e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3824e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3825e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3826e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3827e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3828e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 382982bc0194SAndreas Gruenbacher return 0; 3830e9ef7bb6SLars Ellenberg } 3831e9ef7bb6SLars Ellenberg } 3832e9ef7bb6SLars Ellenberg 3833e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3834e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3835e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3836e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3837e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3838e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3839e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3840e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3841e9ef7bb6SLars Ellenberg 38424ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 38434ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3844b411b363SPhilipp Reisner 384567531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 384667531718SPhilipp Reisner ns.conn = C_BEHIND; 384767531718SPhilipp Reisner 3848b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3849b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3850b411b363SPhilipp Reisner int cr; /* consider resync */ 3851b411b363SPhilipp Reisner 3852b411b363SPhilipp Reisner /* if we established a new connection */ 38534ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3854b411b363SPhilipp Reisner /* if we had an established connection 3855b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 38564ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3857b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 38584ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3859b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3860b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3861b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3862b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3863b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 38644ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3865b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3866b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3867b411b363SPhilipp Reisner 3868b411b363SPhilipp Reisner if (cr) 38694ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3870b411b363SPhilipp Reisner 3871b411b363SPhilipp Reisner put_ldev(mdev); 38724ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 38734ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3874b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 387582f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3876b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3877b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3878b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3879580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3880b411b363SPhilipp Reisner } else { 38818169e41bSPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags)) 388282bc0194SAndreas Gruenbacher return -EIO; 38834ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 388438fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 388582bc0194SAndreas Gruenbacher return -EIO; 3886b411b363SPhilipp Reisner } 3887b411b363SPhilipp Reisner } 3888b411b363SPhilipp Reisner } 3889b411b363SPhilipp Reisner 389087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 389178bae59bSPhilipp Reisner if (os.i != drbd_read_state(mdev).i) 3892b411b363SPhilipp Reisner goto retry; 3893b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3894b411b363SPhilipp Reisner ns.peer = peer_state.role; 3895b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3896b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 38974ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3898b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 38994ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 39002aebfabbSPhilipp Reisner if (ns.pdsk == D_CONSISTENT && drbd_suspended(mdev) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3901481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 39028554df1cSAndreas Gruenbacher /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this 3903481c6f50SPhilipp Reisner for temporal network outages! */ 390487eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3905481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 39062f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 3907481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3908481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 390938fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); 391082bc0194SAndreas Gruenbacher return -EIO; 3911481c6f50SPhilipp Reisner } 391265d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 391378bae59bSPhilipp Reisner ns = drbd_read_state(mdev); 391487eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3915b411b363SPhilipp Reisner 3916b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 391738fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 391882bc0194SAndreas Gruenbacher return -EIO; 3919b411b363SPhilipp Reisner } 3920b411b363SPhilipp Reisner 39214ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 39224ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3923b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3924b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3925b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3926b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3927b411b363SPhilipp Reisner drbd_send_uuids(mdev); 392843de7c85SPhilipp Reisner drbd_send_current_state(mdev); 3929b411b363SPhilipp Reisner } 3930b411b363SPhilipp Reisner } 3931b411b363SPhilipp Reisner 393208b165baSPhilipp Reisner clear_bit(DISCARD_MY_DATA, &mdev->flags); 3933b411b363SPhilipp Reisner 3934b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3935b411b363SPhilipp Reisner 393682bc0194SAndreas Gruenbacher return 0; 3937b411b363SPhilipp Reisner } 3938b411b363SPhilipp Reisner 39394a76b161SAndreas Gruenbacher static int receive_sync_uuid(struct drbd_tconn *tconn, struct packet_info *pi) 3940b411b363SPhilipp Reisner { 39414a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3942e658983aSAndreas Gruenbacher struct p_rs_uuid *p = pi->data; 39434a76b161SAndreas Gruenbacher 39444a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 39454a76b161SAndreas Gruenbacher if (!mdev) 39464a76b161SAndreas Gruenbacher return -EIO; 3947b411b363SPhilipp Reisner 3948b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3949b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3950c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3951b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3952b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3953b411b363SPhilipp Reisner 3954b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3955b411b363SPhilipp Reisner 3956b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3957b411b363SPhilipp Reisner _not_ be rotated into the history */ 3958b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3959b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3960b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3961b411b363SPhilipp Reisner 396262b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3963b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3964b411b363SPhilipp Reisner 3965b411b363SPhilipp Reisner put_ldev(mdev); 3966b411b363SPhilipp Reisner } else 3967b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3968b411b363SPhilipp Reisner 396982bc0194SAndreas Gruenbacher return 0; 3970b411b363SPhilipp Reisner } 3971b411b363SPhilipp Reisner 39722c46407dSAndreas Gruenbacher /** 39732c46407dSAndreas Gruenbacher * receive_bitmap_plain 39742c46407dSAndreas Gruenbacher * 39752c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 39762c46407dSAndreas Gruenbacher * code upon failure. 39772c46407dSAndreas Gruenbacher */ 39782c46407dSAndreas Gruenbacher static int 397950d0b1adSAndreas Gruenbacher receive_bitmap_plain(struct drbd_conf *mdev, unsigned int size, 3980e658983aSAndreas Gruenbacher unsigned long *p, struct bm_xfer_ctx *c) 3981b411b363SPhilipp Reisner { 398250d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - 398350d0b1adSAndreas Gruenbacher drbd_header_size(mdev->tconn); 3984e658983aSAndreas Gruenbacher unsigned int num_words = min_t(size_t, data_size / sizeof(*p), 398550d0b1adSAndreas Gruenbacher c->bm_words - c->word_offset); 3986e658983aSAndreas Gruenbacher unsigned int want = num_words * sizeof(*p); 39872c46407dSAndreas Gruenbacher int err; 3988b411b363SPhilipp Reisner 398950d0b1adSAndreas Gruenbacher if (want != size) { 399050d0b1adSAndreas Gruenbacher dev_err(DEV, "%s:want (%u) != size (%u)\n", __func__, want, size); 39912c46407dSAndreas Gruenbacher return -EIO; 3992b411b363SPhilipp Reisner } 3993b411b363SPhilipp Reisner if (want == 0) 39942c46407dSAndreas Gruenbacher return 0; 3995e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, want); 399682bc0194SAndreas Gruenbacher if (err) 39972c46407dSAndreas Gruenbacher return err; 3998b411b363SPhilipp Reisner 3999e658983aSAndreas Gruenbacher drbd_bm_merge_lel(mdev, c->word_offset, num_words, p); 4000b411b363SPhilipp Reisner 4001b411b363SPhilipp Reisner c->word_offset += num_words; 4002b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 4003b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 4004b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 4005b411b363SPhilipp Reisner 40062c46407dSAndreas Gruenbacher return 1; 4007b411b363SPhilipp Reisner } 4008b411b363SPhilipp Reisner 4009a02d1240SAndreas Gruenbacher static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) 4010a02d1240SAndreas Gruenbacher { 4011a02d1240SAndreas Gruenbacher return (enum drbd_bitmap_code)(p->encoding & 0x0f); 4012a02d1240SAndreas Gruenbacher } 4013a02d1240SAndreas Gruenbacher 4014a02d1240SAndreas Gruenbacher static int dcbp_get_start(struct p_compressed_bm *p) 4015a02d1240SAndreas Gruenbacher { 4016a02d1240SAndreas Gruenbacher return (p->encoding & 0x80) != 0; 4017a02d1240SAndreas Gruenbacher } 4018a02d1240SAndreas Gruenbacher 4019a02d1240SAndreas Gruenbacher static int dcbp_get_pad_bits(struct p_compressed_bm *p) 4020a02d1240SAndreas Gruenbacher { 4021a02d1240SAndreas Gruenbacher return (p->encoding >> 4) & 0x7; 4022a02d1240SAndreas Gruenbacher } 4023a02d1240SAndreas Gruenbacher 40242c46407dSAndreas Gruenbacher /** 40252c46407dSAndreas Gruenbacher * recv_bm_rle_bits 40262c46407dSAndreas Gruenbacher * 40272c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 40282c46407dSAndreas Gruenbacher * code upon failure. 40292c46407dSAndreas Gruenbacher */ 40302c46407dSAndreas Gruenbacher static int 4031b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 4032b411b363SPhilipp Reisner struct p_compressed_bm *p, 4033c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 4034c6d25cfeSPhilipp Reisner unsigned int len) 4035b411b363SPhilipp Reisner { 4036b411b363SPhilipp Reisner struct bitstream bs; 4037b411b363SPhilipp Reisner u64 look_ahead; 4038b411b363SPhilipp Reisner u64 rl; 4039b411b363SPhilipp Reisner u64 tmp; 4040b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 4041b411b363SPhilipp Reisner unsigned long e; 4042a02d1240SAndreas Gruenbacher int toggle = dcbp_get_start(p); 4043b411b363SPhilipp Reisner int have; 4044b411b363SPhilipp Reisner int bits; 4045b411b363SPhilipp Reisner 4046a02d1240SAndreas Gruenbacher bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); 4047b411b363SPhilipp Reisner 4048b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 4049b411b363SPhilipp Reisner if (bits < 0) 40502c46407dSAndreas Gruenbacher return -EIO; 4051b411b363SPhilipp Reisner 4052b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 4053b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 4054b411b363SPhilipp Reisner if (bits <= 0) 40552c46407dSAndreas Gruenbacher return -EIO; 4056b411b363SPhilipp Reisner 4057b411b363SPhilipp Reisner if (toggle) { 4058b411b363SPhilipp Reisner e = s + rl -1; 4059b411b363SPhilipp Reisner if (e >= c->bm_bits) { 4060b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 40612c46407dSAndreas Gruenbacher return -EIO; 4062b411b363SPhilipp Reisner } 4063b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 4064b411b363SPhilipp Reisner } 4065b411b363SPhilipp Reisner 4066b411b363SPhilipp Reisner if (have < bits) { 4067b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 4068b411b363SPhilipp Reisner have, bits, look_ahead, 4069b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 4070b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 40712c46407dSAndreas Gruenbacher return -EIO; 4072b411b363SPhilipp Reisner } 4073b411b363SPhilipp Reisner look_ahead >>= bits; 4074b411b363SPhilipp Reisner have -= bits; 4075b411b363SPhilipp Reisner 4076b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 4077b411b363SPhilipp Reisner if (bits < 0) 40782c46407dSAndreas Gruenbacher return -EIO; 4079b411b363SPhilipp Reisner look_ahead |= tmp << have; 4080b411b363SPhilipp Reisner have += bits; 4081b411b363SPhilipp Reisner } 4082b411b363SPhilipp Reisner 4083b411b363SPhilipp Reisner c->bit_offset = s; 4084b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 4085b411b363SPhilipp Reisner 40862c46407dSAndreas Gruenbacher return (s != c->bm_bits); 4087b411b363SPhilipp Reisner } 4088b411b363SPhilipp Reisner 40892c46407dSAndreas Gruenbacher /** 40902c46407dSAndreas Gruenbacher * decode_bitmap_c 40912c46407dSAndreas Gruenbacher * 40922c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 40932c46407dSAndreas Gruenbacher * code upon failure. 40942c46407dSAndreas Gruenbacher */ 40952c46407dSAndreas Gruenbacher static int 4096b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 4097b411b363SPhilipp Reisner struct p_compressed_bm *p, 4098c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 4099c6d25cfeSPhilipp Reisner unsigned int len) 4100b411b363SPhilipp Reisner { 4101a02d1240SAndreas Gruenbacher if (dcbp_get_code(p) == RLE_VLI_Bits) 4102e658983aSAndreas Gruenbacher return recv_bm_rle_bits(mdev, p, c, len - sizeof(*p)); 4103b411b363SPhilipp Reisner 4104b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 4105b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 4106b411b363SPhilipp Reisner * during all our tests. */ 4107b411b363SPhilipp Reisner 4108b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 410938fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 41102c46407dSAndreas Gruenbacher return -EIO; 4111b411b363SPhilipp Reisner } 4112b411b363SPhilipp Reisner 4113b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 4114b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 4115b411b363SPhilipp Reisner { 4116b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 411750d0b1adSAndreas Gruenbacher unsigned int header_size = drbd_header_size(mdev->tconn); 411850d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; 411950d0b1adSAndreas Gruenbacher unsigned int plain = 412050d0b1adSAndreas Gruenbacher header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + 412150d0b1adSAndreas Gruenbacher c->bm_words * sizeof(unsigned long); 412250d0b1adSAndreas Gruenbacher unsigned int total = c->bytes[0] + c->bytes[1]; 412350d0b1adSAndreas Gruenbacher unsigned int r; 4124b411b363SPhilipp Reisner 4125b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 4126b411b363SPhilipp Reisner if (total == 0) 4127b411b363SPhilipp Reisner return; 4128b411b363SPhilipp Reisner 4129b411b363SPhilipp Reisner /* don't report if not compressed */ 4130b411b363SPhilipp Reisner if (total >= plain) 4131b411b363SPhilipp Reisner return; 4132b411b363SPhilipp Reisner 4133b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 4134b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 4135b411b363SPhilipp Reisner : (1000 * total / plain); 4136b411b363SPhilipp Reisner 4137b411b363SPhilipp Reisner if (r > 1000) 4138b411b363SPhilipp Reisner r = 1000; 4139b411b363SPhilipp Reisner 4140b411b363SPhilipp Reisner r = 1000 - r; 4141b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 4142b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 4143b411b363SPhilipp Reisner direction, 4144b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 4145b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 4146b411b363SPhilipp Reisner total, r/10, r % 10); 4147b411b363SPhilipp Reisner } 4148b411b363SPhilipp Reisner 4149b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 4150b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 4151b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 4152b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 4153b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 4154b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 4155b411b363SPhilipp Reisner 4156b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 41574a76b161SAndreas Gruenbacher static int receive_bitmap(struct drbd_tconn *tconn, struct packet_info *pi) 4158b411b363SPhilipp Reisner { 41594a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 4160b411b363SPhilipp Reisner struct bm_xfer_ctx c; 41612c46407dSAndreas Gruenbacher int err; 41624a76b161SAndreas Gruenbacher 41634a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 41644a76b161SAndreas Gruenbacher if (!mdev) 41654a76b161SAndreas Gruenbacher return -EIO; 4166b411b363SPhilipp Reisner 416720ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 416820ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 416920ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 4170b411b363SPhilipp Reisner 4171b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 4172b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 4173b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 4174b411b363SPhilipp Reisner }; 4175b411b363SPhilipp Reisner 41762c46407dSAndreas Gruenbacher for(;;) { 4177e658983aSAndreas Gruenbacher if (pi->cmd == P_BITMAP) 4178e658983aSAndreas Gruenbacher err = receive_bitmap_plain(mdev, pi->size, pi->data, &c); 4179e658983aSAndreas Gruenbacher else if (pi->cmd == P_COMPRESSED_BITMAP) { 4180b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 4181b411b363SPhilipp Reisner * and the feature is enabled! */ 4182e658983aSAndreas Gruenbacher struct p_compressed_bm *p = pi->data; 4183b411b363SPhilipp Reisner 418450d0b1adSAndreas Gruenbacher if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(tconn)) { 4185b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 418682bc0194SAndreas Gruenbacher err = -EIO; 4187b411b363SPhilipp Reisner goto out; 4188b411b363SPhilipp Reisner } 4189e658983aSAndreas Gruenbacher if (pi->size <= sizeof(*p)) { 4190e2857216SAndreas Gruenbacher dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", pi->size); 419182bc0194SAndreas Gruenbacher err = -EIO; 419278fcbdaeSAndreas Gruenbacher goto out; 4193b411b363SPhilipp Reisner } 4194e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, pi->size); 4195e658983aSAndreas Gruenbacher if (err) 4196e658983aSAndreas Gruenbacher goto out; 4197e2857216SAndreas Gruenbacher err = decode_bitmap_c(mdev, p, &c, pi->size); 4198b411b363SPhilipp Reisner } else { 4199e2857216SAndreas Gruenbacher dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); 420082bc0194SAndreas Gruenbacher err = -EIO; 4201b411b363SPhilipp Reisner goto out; 4202b411b363SPhilipp Reisner } 4203b411b363SPhilipp Reisner 4204e2857216SAndreas Gruenbacher c.packets[pi->cmd == P_BITMAP]++; 420550d0b1adSAndreas Gruenbacher c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(tconn) + pi->size; 4206b411b363SPhilipp Reisner 42072c46407dSAndreas Gruenbacher if (err <= 0) { 42082c46407dSAndreas Gruenbacher if (err < 0) 42092c46407dSAndreas Gruenbacher goto out; 4210b411b363SPhilipp Reisner break; 42112c46407dSAndreas Gruenbacher } 4212e2857216SAndreas Gruenbacher err = drbd_recv_header(mdev->tconn, pi); 421382bc0194SAndreas Gruenbacher if (err) 4214b411b363SPhilipp Reisner goto out; 42152c46407dSAndreas Gruenbacher } 4216b411b363SPhilipp Reisner 4217b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 4218b411b363SPhilipp Reisner 4219b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 4220de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 4221de1f8e4aSAndreas Gruenbacher 422282bc0194SAndreas Gruenbacher err = drbd_send_bitmap(mdev); 422382bc0194SAndreas Gruenbacher if (err) 4224b411b363SPhilipp Reisner goto out; 4225b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 4226de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 4227de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 4228b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 4229b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 4230b411b363SPhilipp Reisner * other threads may have noticed network errors */ 4231b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 4232b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 4233b411b363SPhilipp Reisner } 423482bc0194SAndreas Gruenbacher err = 0; 4235b411b363SPhilipp Reisner 4236b411b363SPhilipp Reisner out: 423720ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 423882bc0194SAndreas Gruenbacher if (!err && mdev->state.conn == C_WF_BITMAP_S) 4239b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 424082bc0194SAndreas Gruenbacher return err; 4241b411b363SPhilipp Reisner } 4242b411b363SPhilipp Reisner 42434a76b161SAndreas Gruenbacher static int receive_skip(struct drbd_tconn *tconn, struct packet_info *pi) 4244b411b363SPhilipp Reisner { 42454a76b161SAndreas Gruenbacher conn_warn(tconn, "skipping unknown optional packet type %d, l: %d!\n", 4246e2857216SAndreas Gruenbacher pi->cmd, pi->size); 42472de876efSPhilipp Reisner 42484a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 42492de876efSPhilipp Reisner } 42502de876efSPhilipp Reisner 42514a76b161SAndreas Gruenbacher static int receive_UnplugRemote(struct drbd_tconn *tconn, struct packet_info *pi) 4252b411b363SPhilipp Reisner { 4253b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 4254b411b363SPhilipp Reisner * with the data requests being unplugged */ 42554a76b161SAndreas Gruenbacher drbd_tcp_quickack(tconn->data.socket); 4256b411b363SPhilipp Reisner 425782bc0194SAndreas Gruenbacher return 0; 4258b411b363SPhilipp Reisner } 4259b411b363SPhilipp Reisner 42604a76b161SAndreas Gruenbacher static int receive_out_of_sync(struct drbd_tconn *tconn, struct packet_info *pi) 426173a01a18SPhilipp Reisner { 42624a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 4263e658983aSAndreas Gruenbacher struct p_block_desc *p = pi->data; 42644a76b161SAndreas Gruenbacher 42654a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 42664a76b161SAndreas Gruenbacher if (!mdev) 42674a76b161SAndreas Gruenbacher return -EIO; 426873a01a18SPhilipp Reisner 4269f735e363SLars Ellenberg switch (mdev->state.conn) { 4270f735e363SLars Ellenberg case C_WF_SYNC_UUID: 4271f735e363SLars Ellenberg case C_WF_BITMAP_T: 4272f735e363SLars Ellenberg case C_BEHIND: 4273f735e363SLars Ellenberg break; 4274f735e363SLars Ellenberg default: 4275f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 4276f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 4277f735e363SLars Ellenberg } 4278f735e363SLars Ellenberg 427973a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 428073a01a18SPhilipp Reisner 428182bc0194SAndreas Gruenbacher return 0; 428273a01a18SPhilipp Reisner } 428373a01a18SPhilipp Reisner 428402918be2SPhilipp Reisner struct data_cmd { 428502918be2SPhilipp Reisner int expect_payload; 428602918be2SPhilipp Reisner size_t pkt_size; 42874a76b161SAndreas Gruenbacher int (*fn)(struct drbd_tconn *, struct packet_info *); 4288b411b363SPhilipp Reisner }; 4289b411b363SPhilipp Reisner 429002918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 42914a76b161SAndreas Gruenbacher [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 42924a76b161SAndreas Gruenbacher [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 42934a76b161SAndreas Gruenbacher [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 42944a76b161SAndreas Gruenbacher [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 4295e658983aSAndreas Gruenbacher [P_BITMAP] = { 1, 0, receive_bitmap } , 4296e658983aSAndreas Gruenbacher [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , 4297e658983aSAndreas Gruenbacher [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, 42984a76b161SAndreas Gruenbacher [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 42994a76b161SAndreas Gruenbacher [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 4300e658983aSAndreas Gruenbacher [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, 4301e658983aSAndreas Gruenbacher [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, 43024a76b161SAndreas Gruenbacher [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 43034a76b161SAndreas Gruenbacher [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 43044a76b161SAndreas Gruenbacher [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 43054a76b161SAndreas Gruenbacher [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 43064a76b161SAndreas Gruenbacher [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 43074a76b161SAndreas Gruenbacher [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 43084a76b161SAndreas Gruenbacher [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 43094a76b161SAndreas Gruenbacher [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 43104a76b161SAndreas Gruenbacher [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 43114a76b161SAndreas Gruenbacher [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 43124a76b161SAndreas Gruenbacher [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 43134a76b161SAndreas Gruenbacher [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, 4314036b17eaSPhilipp Reisner [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, 431502918be2SPhilipp Reisner }; 431602918be2SPhilipp Reisner 4317eefc2f7dSPhilipp Reisner static void drbdd(struct drbd_tconn *tconn) 4318b411b363SPhilipp Reisner { 431977351055SPhilipp Reisner struct packet_info pi; 432002918be2SPhilipp Reisner size_t shs; /* sub header size */ 432182bc0194SAndreas Gruenbacher int err; 4322b411b363SPhilipp Reisner 4323eefc2f7dSPhilipp Reisner while (get_t_state(&tconn->receiver) == RUNNING) { 4324deebe195SAndreas Gruenbacher struct data_cmd *cmd; 4325deebe195SAndreas Gruenbacher 4326eefc2f7dSPhilipp Reisner drbd_thread_current_set_cpu(&tconn->receiver); 432769bc7bc3SAndreas Gruenbacher if (drbd_recv_header(tconn, &pi)) 432802918be2SPhilipp Reisner goto err_out; 432902918be2SPhilipp Reisner 4330deebe195SAndreas Gruenbacher cmd = &drbd_cmd_handler[pi.cmd]; 43314a76b161SAndreas Gruenbacher if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { 43322fcb8f30SAndreas Gruenbacher conn_err(tconn, "Unexpected data packet %s (0x%04x)", 43332fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.cmd); 433402918be2SPhilipp Reisner goto err_out; 43350b33a916SLars Ellenberg } 4336b411b363SPhilipp Reisner 4337e658983aSAndreas Gruenbacher shs = cmd->pkt_size; 4338e658983aSAndreas Gruenbacher if (pi.size > shs && !cmd->expect_payload) { 43392fcb8f30SAndreas Gruenbacher conn_err(tconn, "No payload expected %s l:%d\n", 43402fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.size); 4341c13f7e1aSLars Ellenberg goto err_out; 4342c13f7e1aSLars Ellenberg } 4343c13f7e1aSLars Ellenberg 4344c13f7e1aSLars Ellenberg if (shs) { 4345e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, pi.data, shs); 4346a5c31904SAndreas Gruenbacher if (err) 434702918be2SPhilipp Reisner goto err_out; 4348e2857216SAndreas Gruenbacher pi.size -= shs; 4349b411b363SPhilipp Reisner } 435002918be2SPhilipp Reisner 43514a76b161SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 43524a76b161SAndreas Gruenbacher if (err) { 43539f5bdc33SAndreas Gruenbacher conn_err(tconn, "error receiving %s, e: %d l: %d!\n", 43549f5bdc33SAndreas Gruenbacher cmdname(pi.cmd), err, pi.size); 435502918be2SPhilipp Reisner goto err_out; 4356b411b363SPhilipp Reisner } 4357b411b363SPhilipp Reisner } 435882bc0194SAndreas Gruenbacher return; 435902918be2SPhilipp Reisner 436002918be2SPhilipp Reisner err_out: 4361bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 4362b411b363SPhilipp Reisner } 4363b411b363SPhilipp Reisner 43640e29d163SPhilipp Reisner void conn_flush_workqueue(struct drbd_tconn *tconn) 4365b411b363SPhilipp Reisner { 4366b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 4367b411b363SPhilipp Reisner 4368b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 43690e29d163SPhilipp Reisner barr.w.tconn = tconn; 4370b411b363SPhilipp Reisner init_completion(&barr.done); 43710e29d163SPhilipp Reisner drbd_queue_work(&tconn->data.work, &barr.w); 4372b411b363SPhilipp Reisner wait_for_completion(&barr.done); 4373b411b363SPhilipp Reisner } 4374b411b363SPhilipp Reisner 437581fa2e67SPhilipp Reisner static void conn_disconnect(struct drbd_tconn *tconn) 4376b411b363SPhilipp Reisner { 4377c141ebdaSPhilipp Reisner struct drbd_conf *mdev; 4378bbeb641cSPhilipp Reisner enum drbd_conns oc; 4379376694a0SPhilipp Reisner int vnr; 4380b411b363SPhilipp Reisner 4381bbeb641cSPhilipp Reisner if (tconn->cstate == C_STANDALONE) 4382b411b363SPhilipp Reisner return; 4383b411b363SPhilipp Reisner 4384b8853dbdSPhilipp Reisner /* We are about to start the cleanup after connection loss. 4385b8853dbdSPhilipp Reisner * Make sure drbd_make_request knows about that. 4386b8853dbdSPhilipp Reisner * Usually we should be in some network failure state already, 4387b8853dbdSPhilipp Reisner * but just in case we are not, we fix it up here. 4388b8853dbdSPhilipp Reisner */ 4389b8853dbdSPhilipp Reisner conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); 4390b8853dbdSPhilipp Reisner 4391b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 4392360cc740SPhilipp Reisner drbd_thread_stop(&tconn->asender); 4393360cc740SPhilipp Reisner drbd_free_sock(tconn); 4394360cc740SPhilipp Reisner 4395c141ebdaSPhilipp Reisner rcu_read_lock(); 4396c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 4397c141ebdaSPhilipp Reisner kref_get(&mdev->kref); 4398c141ebdaSPhilipp Reisner rcu_read_unlock(); 4399c141ebdaSPhilipp Reisner drbd_disconnected(mdev); 4400c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 4401c141ebdaSPhilipp Reisner rcu_read_lock(); 4402c141ebdaSPhilipp Reisner } 4403c141ebdaSPhilipp Reisner rcu_read_unlock(); 4404c141ebdaSPhilipp Reisner 440512038a3aSPhilipp Reisner if (!list_empty(&tconn->current_epoch->list)) 440612038a3aSPhilipp Reisner conn_err(tconn, "ASSERTION FAILED: tconn->current_epoch->list not empty\n"); 440712038a3aSPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 440812038a3aSPhilipp Reisner atomic_set(&tconn->current_epoch->epoch_size, 0); 440912038a3aSPhilipp Reisner 4410360cc740SPhilipp Reisner conn_info(tconn, "Connection closed\n"); 4411360cc740SPhilipp Reisner 4412cb703454SPhilipp Reisner if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN) 4413cb703454SPhilipp Reisner conn_try_outdate_peer_async(tconn); 4414cb703454SPhilipp Reisner 4415360cc740SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 4416bbeb641cSPhilipp Reisner oc = tconn->cstate; 4417bbeb641cSPhilipp Reisner if (oc >= C_UNCONNECTED) 4418376694a0SPhilipp Reisner _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); 4419bbeb641cSPhilipp Reisner 4420360cc740SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 4421360cc740SPhilipp Reisner 4422f3dfa40aSLars Ellenberg if (oc == C_DISCONNECTING) 4423d9cc6e23SLars Ellenberg conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); 4424360cc740SPhilipp Reisner } 4425360cc740SPhilipp Reisner 4426c141ebdaSPhilipp Reisner static int drbd_disconnected(struct drbd_conf *mdev) 4427360cc740SPhilipp Reisner { 4428360cc740SPhilipp Reisner unsigned int i; 4429b411b363SPhilipp Reisner 443085719573SPhilipp Reisner /* wait for current activity to cease. */ 443187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4432b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 4433b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 4434b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 443587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4436b411b363SPhilipp Reisner 4437b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 4438b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 4439b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 4440b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 4441b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 4442b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 4443b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 4444b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 4445b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 4446b411b363SPhilipp Reisner * on the fly. */ 4447b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 4448b411b363SPhilipp Reisner mdev->rs_total = 0; 4449b411b363SPhilipp Reisner mdev->rs_failed = 0; 4450b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 4451b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 4452b411b363SPhilipp Reisner 4453b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 4454b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 4455b411b363SPhilipp Reisner 4456b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 4457b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 4458b411b363SPhilipp Reisner * to be "canceled" */ 4459a21e9298SPhilipp Reisner drbd_flush_workqueue(mdev); 4460b411b363SPhilipp Reisner 4461a990be46SAndreas Gruenbacher drbd_finish_peer_reqs(mdev); 4462b411b363SPhilipp Reisner 4463d10b4ea3SPhilipp Reisner /* This second workqueue flush is necessary, since drbd_finish_peer_reqs() 4464d10b4ea3SPhilipp Reisner might have issued a work again. The one before drbd_finish_peer_reqs() is 4465d10b4ea3SPhilipp Reisner necessary to reclain net_ee in drbd_finish_peer_reqs(). */ 4466d10b4ea3SPhilipp Reisner drbd_flush_workqueue(mdev); 4467d10b4ea3SPhilipp Reisner 4468b411b363SPhilipp Reisner kfree(mdev->p_uuid); 4469b411b363SPhilipp Reisner mdev->p_uuid = NULL; 4470b411b363SPhilipp Reisner 44712aebfabbSPhilipp Reisner if (!drbd_suspended(mdev)) 44722f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 4473b411b363SPhilipp Reisner 4474b411b363SPhilipp Reisner drbd_md_sync(mdev); 4475b411b363SPhilipp Reisner 447620ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 447720ceb2b2SLars Ellenberg * if any. */ 447820ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 447920ceb2b2SLars Ellenberg 4480b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 4481b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 4482b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 4483b411b363SPhilipp Reisner * 4484b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 4485b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 4486b411b363SPhilipp Reisner */ 44877721f567SAndreas Gruenbacher i = drbd_free_peer_reqs(mdev, &mdev->net_ee); 4488b411b363SPhilipp Reisner if (i) 4489b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 4490435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 4491435f0740SLars Ellenberg if (i) 4492435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 4493b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 4494b411b363SPhilipp Reisner if (i) 449545bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 4496b411b363SPhilipp Reisner 4497b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 4498b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 4499b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 4500b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 4501b411b363SPhilipp Reisner 4502360cc740SPhilipp Reisner return 0; 4503b411b363SPhilipp Reisner } 4504b411b363SPhilipp Reisner 4505b411b363SPhilipp Reisner /* 4506b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 4507b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 4508b411b363SPhilipp Reisner * 4509b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 4510b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 4511b411b363SPhilipp Reisner * 4512b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 4513b411b363SPhilipp Reisner */ 45146038178eSAndreas Gruenbacher static int drbd_send_features(struct drbd_tconn *tconn) 4515b411b363SPhilipp Reisner { 45169f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 45179f5bdc33SAndreas Gruenbacher struct p_connection_features *p; 4518b411b363SPhilipp Reisner 45199f5bdc33SAndreas Gruenbacher sock = &tconn->data; 45209f5bdc33SAndreas Gruenbacher p = conn_prepare_command(tconn, sock); 45219f5bdc33SAndreas Gruenbacher if (!p) 4522e8d17b01SAndreas Gruenbacher return -EIO; 4523b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 4524b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 4525b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 45269f5bdc33SAndreas Gruenbacher return conn_send_command(tconn, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); 4527b411b363SPhilipp Reisner } 4528b411b363SPhilipp Reisner 4529b411b363SPhilipp Reisner /* 4530b411b363SPhilipp Reisner * return values: 4531b411b363SPhilipp Reisner * 1 yes, we have a valid connection 4532b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 4533b411b363SPhilipp Reisner * -1 peer talks different language, 4534b411b363SPhilipp Reisner * no point in trying again, please go standalone. 4535b411b363SPhilipp Reisner */ 45366038178eSAndreas Gruenbacher static int drbd_do_features(struct drbd_tconn *tconn) 4537b411b363SPhilipp Reisner { 453865d11ed6SPhilipp Reisner /* ASSERT current == tconn->receiver ... */ 4539e658983aSAndreas Gruenbacher struct p_connection_features *p; 4540e658983aSAndreas Gruenbacher const int expect = sizeof(struct p_connection_features); 454177351055SPhilipp Reisner struct packet_info pi; 4542a5c31904SAndreas Gruenbacher int err; 4543b411b363SPhilipp Reisner 45446038178eSAndreas Gruenbacher err = drbd_send_features(tconn); 4545e8d17b01SAndreas Gruenbacher if (err) 4546b411b363SPhilipp Reisner return 0; 4547b411b363SPhilipp Reisner 454869bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 454969bc7bc3SAndreas Gruenbacher if (err) 4550b411b363SPhilipp Reisner return 0; 4551b411b363SPhilipp Reisner 45526038178eSAndreas Gruenbacher if (pi.cmd != P_CONNECTION_FEATURES) { 45536038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", 455477351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4555b411b363SPhilipp Reisner return -1; 4556b411b363SPhilipp Reisner } 4557b411b363SPhilipp Reisner 455877351055SPhilipp Reisner if (pi.size != expect) { 45596038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures length: %u, received: %u\n", 456077351055SPhilipp Reisner expect, pi.size); 4561b411b363SPhilipp Reisner return -1; 4562b411b363SPhilipp Reisner } 4563b411b363SPhilipp Reisner 4564e658983aSAndreas Gruenbacher p = pi.data; 4565e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, p, expect); 4566a5c31904SAndreas Gruenbacher if (err) 4567b411b363SPhilipp Reisner return 0; 4568b411b363SPhilipp Reisner 4569b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 4570b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 4571b411b363SPhilipp Reisner if (p->protocol_max == 0) 4572b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 4573b411b363SPhilipp Reisner 4574b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 4575b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 4576b411b363SPhilipp Reisner goto incompat; 4577b411b363SPhilipp Reisner 457865d11ed6SPhilipp Reisner tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 4579b411b363SPhilipp Reisner 458065d11ed6SPhilipp Reisner conn_info(tconn, "Handshake successful: " 458165d11ed6SPhilipp Reisner "Agreed network protocol version %d\n", tconn->agreed_pro_version); 4582b411b363SPhilipp Reisner 4583b411b363SPhilipp Reisner return 1; 4584b411b363SPhilipp Reisner 4585b411b363SPhilipp Reisner incompat: 458665d11ed6SPhilipp Reisner conn_err(tconn, "incompatible DRBD dialects: " 4587b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 4588b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 4589b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 4590b411b363SPhilipp Reisner return -1; 4591b411b363SPhilipp Reisner } 4592b411b363SPhilipp Reisner 4593b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 459413e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4595b411b363SPhilipp Reisner { 4596b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 4597b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 4598b10d96cbSJohannes Thoma return -1; 4599b411b363SPhilipp Reisner } 4600b411b363SPhilipp Reisner #else 4601b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4602b10d96cbSJohannes Thoma 4603b10d96cbSJohannes Thoma /* Return value: 4604b10d96cbSJohannes Thoma 1 - auth succeeded, 4605b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4606b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4607b10d96cbSJohannes Thoma */ 4608b10d96cbSJohannes Thoma 460913e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4610b411b363SPhilipp Reisner { 46119f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 4612b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4613b411b363SPhilipp Reisner struct scatterlist sg; 4614b411b363SPhilipp Reisner char *response = NULL; 4615b411b363SPhilipp Reisner char *right_response = NULL; 4616b411b363SPhilipp Reisner char *peers_ch = NULL; 461744ed167dSPhilipp Reisner unsigned int key_len; 461844ed167dSPhilipp Reisner char secret[SHARED_SECRET_MAX]; /* 64 byte */ 4619b411b363SPhilipp Reisner unsigned int resp_size; 4620b411b363SPhilipp Reisner struct hash_desc desc; 462177351055SPhilipp Reisner struct packet_info pi; 462244ed167dSPhilipp Reisner struct net_conf *nc; 462369bc7bc3SAndreas Gruenbacher int err, rv; 4624b411b363SPhilipp Reisner 46259f5bdc33SAndreas Gruenbacher /* FIXME: Put the challenge/response into the preallocated socket buffer. */ 46269f5bdc33SAndreas Gruenbacher 462744ed167dSPhilipp Reisner rcu_read_lock(); 462844ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 462944ed167dSPhilipp Reisner key_len = strlen(nc->shared_secret); 463044ed167dSPhilipp Reisner memcpy(secret, nc->shared_secret, key_len); 463144ed167dSPhilipp Reisner rcu_read_unlock(); 463244ed167dSPhilipp Reisner 463313e6037dSPhilipp Reisner desc.tfm = tconn->cram_hmac_tfm; 4634b411b363SPhilipp Reisner desc.flags = 0; 4635b411b363SPhilipp Reisner 463644ed167dSPhilipp Reisner rv = crypto_hash_setkey(tconn->cram_hmac_tfm, (u8 *)secret, key_len); 4637b411b363SPhilipp Reisner if (rv) { 463813e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); 4639b10d96cbSJohannes Thoma rv = -1; 4640b411b363SPhilipp Reisner goto fail; 4641b411b363SPhilipp Reisner } 4642b411b363SPhilipp Reisner 4643b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4644b411b363SPhilipp Reisner 46459f5bdc33SAndreas Gruenbacher sock = &tconn->data; 46469f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 46479f5bdc33SAndreas Gruenbacher rv = 0; 46489f5bdc33SAndreas Gruenbacher goto fail; 46499f5bdc33SAndreas Gruenbacher } 4650e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_CHALLENGE, 0, 46519f5bdc33SAndreas Gruenbacher my_challenge, CHALLENGE_LEN); 4652b411b363SPhilipp Reisner if (!rv) 4653b411b363SPhilipp Reisner goto fail; 4654b411b363SPhilipp Reisner 465569bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 465669bc7bc3SAndreas Gruenbacher if (err) { 465769bc7bc3SAndreas Gruenbacher rv = 0; 4658b411b363SPhilipp Reisner goto fail; 465969bc7bc3SAndreas Gruenbacher } 4660b411b363SPhilipp Reisner 466177351055SPhilipp Reisner if (pi.cmd != P_AUTH_CHALLENGE) { 466213e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", 466377351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4664b411b363SPhilipp Reisner rv = 0; 4665b411b363SPhilipp Reisner goto fail; 4666b411b363SPhilipp Reisner } 4667b411b363SPhilipp Reisner 466877351055SPhilipp Reisner if (pi.size > CHALLENGE_LEN * 2) { 466913e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge payload too big.\n"); 4670b10d96cbSJohannes Thoma rv = -1; 4671b411b363SPhilipp Reisner goto fail; 4672b411b363SPhilipp Reisner } 4673b411b363SPhilipp Reisner 467477351055SPhilipp Reisner peers_ch = kmalloc(pi.size, GFP_NOIO); 4675b411b363SPhilipp Reisner if (peers_ch == NULL) { 467613e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of peers_ch failed\n"); 4677b10d96cbSJohannes Thoma rv = -1; 4678b411b363SPhilipp Reisner goto fail; 4679b411b363SPhilipp Reisner } 4680b411b363SPhilipp Reisner 4681a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, peers_ch, pi.size); 4682a5c31904SAndreas Gruenbacher if (err) { 4683b411b363SPhilipp Reisner rv = 0; 4684b411b363SPhilipp Reisner goto fail; 4685b411b363SPhilipp Reisner } 4686b411b363SPhilipp Reisner 468713e6037dSPhilipp Reisner resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); 4688b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4689b411b363SPhilipp Reisner if (response == NULL) { 469013e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of response failed\n"); 4691b10d96cbSJohannes Thoma rv = -1; 4692b411b363SPhilipp Reisner goto fail; 4693b411b363SPhilipp Reisner } 4694b411b363SPhilipp Reisner 4695b411b363SPhilipp Reisner sg_init_table(&sg, 1); 469677351055SPhilipp Reisner sg_set_buf(&sg, peers_ch, pi.size); 4697b411b363SPhilipp Reisner 4698b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4699b411b363SPhilipp Reisner if (rv) { 470013e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4701b10d96cbSJohannes Thoma rv = -1; 4702b411b363SPhilipp Reisner goto fail; 4703b411b363SPhilipp Reisner } 4704b411b363SPhilipp Reisner 47059f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 47069f5bdc33SAndreas Gruenbacher rv = 0; 47079f5bdc33SAndreas Gruenbacher goto fail; 47089f5bdc33SAndreas Gruenbacher } 4709e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_RESPONSE, 0, 47109f5bdc33SAndreas Gruenbacher response, resp_size); 4711b411b363SPhilipp Reisner if (!rv) 4712b411b363SPhilipp Reisner goto fail; 4713b411b363SPhilipp Reisner 471469bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 471569bc7bc3SAndreas Gruenbacher if (err) { 471669bc7bc3SAndreas Gruenbacher rv = 0; 4717b411b363SPhilipp Reisner goto fail; 471869bc7bc3SAndreas Gruenbacher } 4719b411b363SPhilipp Reisner 472077351055SPhilipp Reisner if (pi.cmd != P_AUTH_RESPONSE) { 472113e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", 472277351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4723b411b363SPhilipp Reisner rv = 0; 4724b411b363SPhilipp Reisner goto fail; 4725b411b363SPhilipp Reisner } 4726b411b363SPhilipp Reisner 472777351055SPhilipp Reisner if (pi.size != resp_size) { 472813e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse payload of wrong size\n"); 4729b411b363SPhilipp Reisner rv = 0; 4730b411b363SPhilipp Reisner goto fail; 4731b411b363SPhilipp Reisner } 4732b411b363SPhilipp Reisner 4733a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, response , resp_size); 4734a5c31904SAndreas Gruenbacher if (err) { 4735b411b363SPhilipp Reisner rv = 0; 4736b411b363SPhilipp Reisner goto fail; 4737b411b363SPhilipp Reisner } 4738b411b363SPhilipp Reisner 4739b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 47402d1ee87dSJulia Lawall if (right_response == NULL) { 474113e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of right_response failed\n"); 4742b10d96cbSJohannes Thoma rv = -1; 4743b411b363SPhilipp Reisner goto fail; 4744b411b363SPhilipp Reisner } 4745b411b363SPhilipp Reisner 4746b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4747b411b363SPhilipp Reisner 4748b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4749b411b363SPhilipp Reisner if (rv) { 475013e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4751b10d96cbSJohannes Thoma rv = -1; 4752b411b363SPhilipp Reisner goto fail; 4753b411b363SPhilipp Reisner } 4754b411b363SPhilipp Reisner 4755b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4756b411b363SPhilipp Reisner 4757b411b363SPhilipp Reisner if (rv) 475844ed167dSPhilipp Reisner conn_info(tconn, "Peer authenticated using %d bytes HMAC\n", 475944ed167dSPhilipp Reisner resp_size); 4760b10d96cbSJohannes Thoma else 4761b10d96cbSJohannes Thoma rv = -1; 4762b411b363SPhilipp Reisner 4763b411b363SPhilipp Reisner fail: 4764b411b363SPhilipp Reisner kfree(peers_ch); 4765b411b363SPhilipp Reisner kfree(response); 4766b411b363SPhilipp Reisner kfree(right_response); 4767b411b363SPhilipp Reisner 4768b411b363SPhilipp Reisner return rv; 4769b411b363SPhilipp Reisner } 4770b411b363SPhilipp Reisner #endif 4771b411b363SPhilipp Reisner 4772b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4773b411b363SPhilipp Reisner { 4774392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 4775b411b363SPhilipp Reisner int h; 4776b411b363SPhilipp Reisner 47774d641dd7SPhilipp Reisner conn_info(tconn, "receiver (re)started\n"); 4778b411b363SPhilipp Reisner 4779b411b363SPhilipp Reisner do { 478081fa2e67SPhilipp Reisner h = conn_connect(tconn); 4781b411b363SPhilipp Reisner if (h == 0) { 478281fa2e67SPhilipp Reisner conn_disconnect(tconn); 478320ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4784b411b363SPhilipp Reisner } 4785b411b363SPhilipp Reisner if (h == -1) { 47864d641dd7SPhilipp Reisner conn_warn(tconn, "Discarding network configuration.\n"); 4787bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 4788b411b363SPhilipp Reisner } 4789b411b363SPhilipp Reisner } while (h == 0); 4790b411b363SPhilipp Reisner 479191fd4dadSPhilipp Reisner if (h > 0) 47924d641dd7SPhilipp Reisner drbdd(tconn); 4793b411b363SPhilipp Reisner 479481fa2e67SPhilipp Reisner conn_disconnect(tconn); 4795b411b363SPhilipp Reisner 47964d641dd7SPhilipp Reisner conn_info(tconn, "receiver terminated\n"); 4797b411b363SPhilipp Reisner return 0; 4798b411b363SPhilipp Reisner } 4799b411b363SPhilipp Reisner 4800b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4801b411b363SPhilipp Reisner 4802e05e1e59SAndreas Gruenbacher static int got_conn_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4803b411b363SPhilipp Reisner { 4804e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4805b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4806b411b363SPhilipp Reisner 4807fc3b10a4SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4808fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags); 4809fc3b10a4SPhilipp Reisner } else { 4810fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags); 4811fc3b10a4SPhilipp Reisner conn_err(tconn, "Requested state change failed by peer: %s (%d)\n", 4812fc3b10a4SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4813fc3b10a4SPhilipp Reisner } 4814fc3b10a4SPhilipp Reisner wake_up(&tconn->ping_wait); 4815e4f78edeSPhilipp Reisner 48162735a594SAndreas Gruenbacher return 0; 4817fc3b10a4SPhilipp Reisner } 4818e4f78edeSPhilipp Reisner 48191952e916SAndreas Gruenbacher static int got_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4820e4f78edeSPhilipp Reisner { 48211952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4822e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4823e4f78edeSPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4824e4f78edeSPhilipp Reisner 48251952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48261952e916SAndreas Gruenbacher if (!mdev) 48272735a594SAndreas Gruenbacher return -EIO; 48281952e916SAndreas Gruenbacher 48294d0fc3fdSPhilipp Reisner if (test_bit(CONN_WD_ST_CHG_REQ, &tconn->flags)) { 48304d0fc3fdSPhilipp Reisner D_ASSERT(tconn->agreed_pro_version < 100); 48314d0fc3fdSPhilipp Reisner return got_conn_RqSReply(tconn, pi); 48324d0fc3fdSPhilipp Reisner } 48334d0fc3fdSPhilipp Reisner 4834e4f78edeSPhilipp Reisner if (retcode >= SS_SUCCESS) { 4835e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4836e4f78edeSPhilipp Reisner } else { 4837e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4838e4f78edeSPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4839e4f78edeSPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4840e4f78edeSPhilipp Reisner } 4841e4f78edeSPhilipp Reisner wake_up(&mdev->state_wait); 4842e4f78edeSPhilipp Reisner 48432735a594SAndreas Gruenbacher return 0; 4844b411b363SPhilipp Reisner } 4845b411b363SPhilipp Reisner 4846e05e1e59SAndreas Gruenbacher static int got_Ping(struct drbd_tconn *tconn, struct packet_info *pi) 4847b411b363SPhilipp Reisner { 48482735a594SAndreas Gruenbacher return drbd_send_ping_ack(tconn); 4849b411b363SPhilipp Reisner 4850b411b363SPhilipp Reisner } 4851b411b363SPhilipp Reisner 4852e05e1e59SAndreas Gruenbacher static int got_PingAck(struct drbd_tconn *tconn, struct packet_info *pi) 4853b411b363SPhilipp Reisner { 4854b411b363SPhilipp Reisner /* restore idle timeout */ 48552a67d8b9SPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; 48562a67d8b9SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) 48572a67d8b9SPhilipp Reisner wake_up(&tconn->ping_wait); 4858b411b363SPhilipp Reisner 48592735a594SAndreas Gruenbacher return 0; 4860b411b363SPhilipp Reisner } 4861b411b363SPhilipp Reisner 48621952e916SAndreas Gruenbacher static int got_IsInSync(struct drbd_tconn *tconn, struct packet_info *pi) 4863b411b363SPhilipp Reisner { 48641952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4865e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4866b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4867b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4868b411b363SPhilipp Reisner 48691952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48701952e916SAndreas Gruenbacher if (!mdev) 48712735a594SAndreas Gruenbacher return -EIO; 48721952e916SAndreas Gruenbacher 487331890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 4874b411b363SPhilipp Reisner 4875b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4876b411b363SPhilipp Reisner 48771d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4878b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4879b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4880b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4881b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 48821d53f09eSLars Ellenberg put_ldev(mdev); 48831d53f09eSLars Ellenberg } 4884b411b363SPhilipp Reisner dec_rs_pending(mdev); 4885778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4886b411b363SPhilipp Reisner 48872735a594SAndreas Gruenbacher return 0; 4888b411b363SPhilipp Reisner } 4889b411b363SPhilipp Reisner 4890bc9c5c41SAndreas Gruenbacher static int 4891bc9c5c41SAndreas Gruenbacher validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, 4892bc9c5c41SAndreas Gruenbacher struct rb_root *root, const char *func, 4893bc9c5c41SAndreas Gruenbacher enum drbd_req_event what, bool missing_ok) 4894b411b363SPhilipp Reisner { 4895b411b363SPhilipp Reisner struct drbd_request *req; 4896b411b363SPhilipp Reisner struct bio_and_error m; 4897b411b363SPhilipp Reisner 489887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4899bc9c5c41SAndreas Gruenbacher req = find_request(mdev, root, id, sector, missing_ok, func); 4900b411b363SPhilipp Reisner if (unlikely(!req)) { 490187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 490285997675SAndreas Gruenbacher return -EIO; 4903b411b363SPhilipp Reisner } 4904b411b363SPhilipp Reisner __req_mod(req, what, &m); 490587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4906b411b363SPhilipp Reisner 4907b411b363SPhilipp Reisner if (m.bio) 4908b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 490985997675SAndreas Gruenbacher return 0; 4910b411b363SPhilipp Reisner } 4911b411b363SPhilipp Reisner 49121952e916SAndreas Gruenbacher static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi) 4913b411b363SPhilipp Reisner { 49141952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4915e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4916b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4917b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4918b411b363SPhilipp Reisner enum drbd_req_event what; 4919b411b363SPhilipp Reisner 49201952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49211952e916SAndreas Gruenbacher if (!mdev) 49222735a594SAndreas Gruenbacher return -EIO; 49231952e916SAndreas Gruenbacher 4924b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4925b411b363SPhilipp Reisner 4926579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4927b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4928b411b363SPhilipp Reisner dec_rs_pending(mdev); 49292735a594SAndreas Gruenbacher return 0; 4930b411b363SPhilipp Reisner } 4931e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 4932b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 49338554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER_AND_SIS; 4934b411b363SPhilipp Reisner break; 4935b411b363SPhilipp Reisner case P_WRITE_ACK: 49368554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER; 4937b411b363SPhilipp Reisner break; 4938b411b363SPhilipp Reisner case P_RECV_ACK: 49398554df1cSAndreas Gruenbacher what = RECV_ACKED_BY_PEER; 4940b411b363SPhilipp Reisner break; 49417be8da07SAndreas Gruenbacher case P_DISCARD_WRITE: 49427be8da07SAndreas Gruenbacher what = DISCARD_WRITE; 49437be8da07SAndreas Gruenbacher break; 49447be8da07SAndreas Gruenbacher case P_RETRY_WRITE: 49457be8da07SAndreas Gruenbacher what = POSTPONE_WRITE; 4946b411b363SPhilipp Reisner break; 4947b411b363SPhilipp Reisner default: 49482735a594SAndreas Gruenbacher BUG(); 4949b411b363SPhilipp Reisner } 4950b411b363SPhilipp Reisner 49512735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 4952bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4953bc9c5c41SAndreas Gruenbacher what, false); 4954b411b363SPhilipp Reisner } 4955b411b363SPhilipp Reisner 49561952e916SAndreas Gruenbacher static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi) 4957b411b363SPhilipp Reisner { 49581952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4959e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4960b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 49612deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 496285997675SAndreas Gruenbacher int err; 4963b411b363SPhilipp Reisner 49641952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49651952e916SAndreas Gruenbacher if (!mdev) 49662735a594SAndreas Gruenbacher return -EIO; 49671952e916SAndreas Gruenbacher 4968b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4969b411b363SPhilipp Reisner 4970579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4971b411b363SPhilipp Reisner dec_rs_pending(mdev); 4972b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 49732735a594SAndreas Gruenbacher return 0; 4974b411b363SPhilipp Reisner } 49752deb8336SPhilipp Reisner 497685997675SAndreas Gruenbacher err = validate_req_change_req_state(mdev, p->block_id, sector, 4977bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4978303d1448SPhilipp Reisner NEG_ACKED, true); 497985997675SAndreas Gruenbacher if (err) { 49802deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 49812deb8336SPhilipp Reisner The master bio might already be completed, therefore the 4982c3afd8f5SAndreas Gruenbacher request is no longer in the collision hash. */ 49832deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 49842deb8336SPhilipp Reisner but then get a P_NEG_ACK afterwards. */ 4985c3afd8f5SAndreas Gruenbacher drbd_set_out_of_sync(mdev, sector, size); 49862deb8336SPhilipp Reisner } 49872735a594SAndreas Gruenbacher return 0; 4988b411b363SPhilipp Reisner } 4989b411b363SPhilipp Reisner 49901952e916SAndreas Gruenbacher static int got_NegDReply(struct drbd_tconn *tconn, struct packet_info *pi) 4991b411b363SPhilipp Reisner { 49921952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4993e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4994b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4995b411b363SPhilipp Reisner 49961952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49971952e916SAndreas Gruenbacher if (!mdev) 49982735a594SAndreas Gruenbacher return -EIO; 49991952e916SAndreas Gruenbacher 5000b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 50017be8da07SAndreas Gruenbacher 5002380207d0SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u.\n", 5003b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 5004b411b363SPhilipp Reisner 50052735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 5006bc9c5c41SAndreas Gruenbacher &mdev->read_requests, __func__, 50078554df1cSAndreas Gruenbacher NEG_ACKED, false); 5008b411b363SPhilipp Reisner } 5009b411b363SPhilipp Reisner 50101952e916SAndreas Gruenbacher static int got_NegRSDReply(struct drbd_tconn *tconn, struct packet_info *pi) 5011b411b363SPhilipp Reisner { 50121952e916SAndreas Gruenbacher struct drbd_conf *mdev; 5013b411b363SPhilipp Reisner sector_t sector; 5014b411b363SPhilipp Reisner int size; 5015e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 50161952e916SAndreas Gruenbacher 50171952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 50181952e916SAndreas Gruenbacher if (!mdev) 50192735a594SAndreas Gruenbacher return -EIO; 5020b411b363SPhilipp Reisner 5021b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 5022b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 5023b411b363SPhilipp Reisner 5024b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 5025b411b363SPhilipp Reisner 5026b411b363SPhilipp Reisner dec_rs_pending(mdev); 5027b411b363SPhilipp Reisner 5028b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 5029b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 5030e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 5031d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 5032b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 5033d612d309SPhilipp Reisner case P_RS_CANCEL: 5034d612d309SPhilipp Reisner break; 5035d612d309SPhilipp Reisner default: 50362735a594SAndreas Gruenbacher BUG(); 5037d612d309SPhilipp Reisner } 5038b411b363SPhilipp Reisner put_ldev(mdev); 5039b411b363SPhilipp Reisner } 5040b411b363SPhilipp Reisner 50412735a594SAndreas Gruenbacher return 0; 5042b411b363SPhilipp Reisner } 5043b411b363SPhilipp Reisner 50441952e916SAndreas Gruenbacher static int got_BarrierAck(struct drbd_tconn *tconn, struct packet_info *pi) 5045b411b363SPhilipp Reisner { 5046e658983aSAndreas Gruenbacher struct p_barrier_ack *p = pi->data; 50479ed57dcbSLars Ellenberg struct drbd_conf *mdev; 50489ed57dcbSLars Ellenberg int vnr; 50491952e916SAndreas Gruenbacher 50509ed57dcbSLars Ellenberg tl_release(tconn, p->barrier, be32_to_cpu(p->set_size)); 5051b411b363SPhilipp Reisner 50529ed57dcbSLars Ellenberg rcu_read_lock(); 50539ed57dcbSLars Ellenberg idr_for_each_entry(&tconn->volumes, mdev, vnr) { 5054c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 5055c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 505636baf611SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->flags)) { 5057370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 5058370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 5059c4752ef1SPhilipp Reisner } 50609ed57dcbSLars Ellenberg } 50619ed57dcbSLars Ellenberg rcu_read_unlock(); 5062c4752ef1SPhilipp Reisner 50632735a594SAndreas Gruenbacher return 0; 5064b411b363SPhilipp Reisner } 5065b411b363SPhilipp Reisner 50661952e916SAndreas Gruenbacher static int got_OVResult(struct drbd_tconn *tconn, struct packet_info *pi) 5067b411b363SPhilipp Reisner { 50681952e916SAndreas Gruenbacher struct drbd_conf *mdev; 5069e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 5070b411b363SPhilipp Reisner struct drbd_work *w; 5071b411b363SPhilipp Reisner sector_t sector; 5072b411b363SPhilipp Reisner int size; 5073b411b363SPhilipp Reisner 50741952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 50751952e916SAndreas Gruenbacher if (!mdev) 50762735a594SAndreas Gruenbacher return -EIO; 50771952e916SAndreas Gruenbacher 5078b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 5079b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 5080b411b363SPhilipp Reisner 5081b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 5082b411b363SPhilipp Reisner 5083b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 50848f7bed77SAndreas Gruenbacher drbd_ov_out_of_sync_found(mdev, sector, size); 5085b411b363SPhilipp Reisner else 50868f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 5087b411b363SPhilipp Reisner 50881d53f09eSLars Ellenberg if (!get_ldev(mdev)) 50892735a594SAndreas Gruenbacher return 0; 50901d53f09eSLars Ellenberg 5091b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 5092b411b363SPhilipp Reisner dec_rs_pending(mdev); 5093b411b363SPhilipp Reisner 5094ea5442afSLars Ellenberg --mdev->ov_left; 5095ea5442afSLars Ellenberg 5096ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 5097ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 5098ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 5099ea5442afSLars Ellenberg 5100ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 5101b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 5102b411b363SPhilipp Reisner if (w) { 5103b411b363SPhilipp Reisner w->cb = w_ov_finished; 5104a21e9298SPhilipp Reisner w->mdev = mdev; 5105e42325a5SPhilipp Reisner drbd_queue_work_front(&mdev->tconn->data.work, w); 5106b411b363SPhilipp Reisner } else { 5107b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 51088f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 5109b411b363SPhilipp Reisner drbd_resync_finished(mdev); 5110b411b363SPhilipp Reisner } 5111b411b363SPhilipp Reisner } 51121d53f09eSLars Ellenberg put_ldev(mdev); 51132735a594SAndreas Gruenbacher return 0; 5114b411b363SPhilipp Reisner } 5115b411b363SPhilipp Reisner 51161952e916SAndreas Gruenbacher static int got_skip(struct drbd_tconn *tconn, struct packet_info *pi) 51170ced55a3SPhilipp Reisner { 51182735a594SAndreas Gruenbacher return 0; 51190ced55a3SPhilipp Reisner } 51200ced55a3SPhilipp Reisner 5121a990be46SAndreas Gruenbacher static int tconn_finish_peer_reqs(struct drbd_tconn *tconn) 512232862ec7SPhilipp Reisner { 5123082a3439SPhilipp Reisner struct drbd_conf *mdev; 5124c141ebdaSPhilipp Reisner int vnr, not_empty = 0; 512532862ec7SPhilipp Reisner 512632862ec7SPhilipp Reisner do { 512732862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 512832862ec7SPhilipp Reisner flush_signals(current); 5129c141ebdaSPhilipp Reisner 5130c141ebdaSPhilipp Reisner rcu_read_lock(); 5131c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 5132c141ebdaSPhilipp Reisner kref_get(&mdev->kref); 5133c141ebdaSPhilipp Reisner rcu_read_unlock(); 5134d3fcb490SPhilipp Reisner if (drbd_finish_peer_reqs(mdev)) { 5135c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 5136c141ebdaSPhilipp Reisner return 1; 5137082a3439SPhilipp Reisner } 5138c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 5139c141ebdaSPhilipp Reisner rcu_read_lock(); 5140d3fcb490SPhilipp Reisner } 514132862ec7SPhilipp Reisner set_bit(SIGNAL_ASENDER, &tconn->flags); 5142082a3439SPhilipp Reisner 5143082a3439SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 5144c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 5145082a3439SPhilipp Reisner not_empty = !list_empty(&mdev->done_ee); 5146082a3439SPhilipp Reisner if (not_empty) 5147082a3439SPhilipp Reisner break; 5148082a3439SPhilipp Reisner } 5149082a3439SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 5150c141ebdaSPhilipp Reisner rcu_read_unlock(); 515132862ec7SPhilipp Reisner } while (not_empty); 515232862ec7SPhilipp Reisner 515332862ec7SPhilipp Reisner return 0; 515432862ec7SPhilipp Reisner } 515532862ec7SPhilipp Reisner 51567201b972SAndreas Gruenbacher struct asender_cmd { 51577201b972SAndreas Gruenbacher size_t pkt_size; 51581952e916SAndreas Gruenbacher int (*fn)(struct drbd_tconn *tconn, struct packet_info *); 51597201b972SAndreas Gruenbacher }; 51607201b972SAndreas Gruenbacher 51617201b972SAndreas Gruenbacher static struct asender_cmd asender_tbl[] = { 5162e658983aSAndreas Gruenbacher [P_PING] = { 0, got_Ping }, 5163e658983aSAndreas Gruenbacher [P_PING_ACK] = { 0, got_PingAck }, 51641952e916SAndreas Gruenbacher [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 51651952e916SAndreas Gruenbacher [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 51661952e916SAndreas Gruenbacher [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 51671952e916SAndreas Gruenbacher [P_DISCARD_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 51681952e916SAndreas Gruenbacher [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 51691952e916SAndreas Gruenbacher [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 51701952e916SAndreas Gruenbacher [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, 51711952e916SAndreas Gruenbacher [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 51721952e916SAndreas Gruenbacher [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 51731952e916SAndreas Gruenbacher [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 51741952e916SAndreas Gruenbacher [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 51751952e916SAndreas Gruenbacher [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 51761952e916SAndreas Gruenbacher [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, 51771952e916SAndreas Gruenbacher [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, 51781952e916SAndreas Gruenbacher [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 51797201b972SAndreas Gruenbacher }; 51807201b972SAndreas Gruenbacher 5181b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 5182b411b363SPhilipp Reisner { 5183392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 5184b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 518577351055SPhilipp Reisner struct packet_info pi; 5186257d0af6SPhilipp Reisner int rv; 5187e658983aSAndreas Gruenbacher void *buf = tconn->meta.rbuf; 5188b411b363SPhilipp Reisner int received = 0; 518952b061a4SAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 519052b061a4SAndreas Gruenbacher int expect = header_size; 519144ed167dSPhilipp Reisner bool ping_timeout_active = false; 519244ed167dSPhilipp Reisner struct net_conf *nc; 5193bb77d34eSAndreas Gruenbacher int ping_timeo, tcp_cork, ping_int; 5194b411b363SPhilipp Reisner 5195b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 5196b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 5197b411b363SPhilipp Reisner 5198e77a0a5cSAndreas Gruenbacher while (get_t_state(thi) == RUNNING) { 519980822284SPhilipp Reisner drbd_thread_current_set_cpu(thi); 520044ed167dSPhilipp Reisner 520144ed167dSPhilipp Reisner rcu_read_lock(); 520244ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 520344ed167dSPhilipp Reisner ping_timeo = nc->ping_timeo; 5204bb77d34eSAndreas Gruenbacher tcp_cork = nc->tcp_cork; 520544ed167dSPhilipp Reisner ping_int = nc->ping_int; 520644ed167dSPhilipp Reisner rcu_read_unlock(); 520744ed167dSPhilipp Reisner 520832862ec7SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &tconn->flags)) { 5209a17647aaSAndreas Gruenbacher if (drbd_send_ping(tconn)) { 521032862ec7SPhilipp Reisner conn_err(tconn, "drbd_send_ping has failed\n"); 5211841ce241SAndreas Gruenbacher goto reconnect; 5212841ce241SAndreas Gruenbacher } 521344ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_timeo * HZ / 10; 521444ed167dSPhilipp Reisner ping_timeout_active = true; 5215b411b363SPhilipp Reisner } 5216b411b363SPhilipp Reisner 521732862ec7SPhilipp Reisner /* TODO: conditionally cork; it may hurt latency if we cork without 521832862ec7SPhilipp Reisner much to send */ 5219bb77d34eSAndreas Gruenbacher if (tcp_cork) 522032862ec7SPhilipp Reisner drbd_tcp_cork(tconn->meta.socket); 5221a990be46SAndreas Gruenbacher if (tconn_finish_peer_reqs(tconn)) { 5222a990be46SAndreas Gruenbacher conn_err(tconn, "tconn_finish_peer_reqs() failed\n"); 5223b411b363SPhilipp Reisner goto reconnect; 5224082a3439SPhilipp Reisner } 5225b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 5226bb77d34eSAndreas Gruenbacher if (tcp_cork) 522732862ec7SPhilipp Reisner drbd_tcp_uncork(tconn->meta.socket); 5228b411b363SPhilipp Reisner 5229b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 5230b411b363SPhilipp Reisner if (signal_pending(current)) 5231b411b363SPhilipp Reisner continue; 5232b411b363SPhilipp Reisner 523332862ec7SPhilipp Reisner rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); 523432862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5235b411b363SPhilipp Reisner 5236b411b363SPhilipp Reisner flush_signals(current); 5237b411b363SPhilipp Reisner 5238b411b363SPhilipp Reisner /* Note: 5239b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 5240b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 5241b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 5242b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 5243b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 5244b411b363SPhilipp Reisner * rv == expected: full header or command 5245b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 5246b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 5247b411b363SPhilipp Reisner */ 5248b411b363SPhilipp Reisner if (likely(rv > 0)) { 5249b411b363SPhilipp Reisner received += rv; 5250b411b363SPhilipp Reisner buf += rv; 5251b411b363SPhilipp Reisner } else if (rv == 0) { 525232862ec7SPhilipp Reisner conn_err(tconn, "meta connection shut down by peer.\n"); 5253b411b363SPhilipp Reisner goto reconnect; 5254b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 5255cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 5256cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 525732862ec7SPhilipp Reisner if (time_after(tconn->last_received, 525832862ec7SPhilipp Reisner jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) 5259cb6518cbSLars Ellenberg continue; 5260f36af18cSLars Ellenberg if (ping_timeout_active) { 526132862ec7SPhilipp Reisner conn_err(tconn, "PingAck did not arrive in time.\n"); 5262b411b363SPhilipp Reisner goto reconnect; 5263b411b363SPhilipp Reisner } 526432862ec7SPhilipp Reisner set_bit(SEND_PING, &tconn->flags); 5265b411b363SPhilipp Reisner continue; 5266b411b363SPhilipp Reisner } else if (rv == -EINTR) { 5267b411b363SPhilipp Reisner continue; 5268b411b363SPhilipp Reisner } else { 526932862ec7SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 5270b411b363SPhilipp Reisner goto reconnect; 5271b411b363SPhilipp Reisner } 5272b411b363SPhilipp Reisner 5273b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 5274e658983aSAndreas Gruenbacher if (decode_header(tconn, tconn->meta.rbuf, &pi)) 5275b411b363SPhilipp Reisner goto reconnect; 52767201b972SAndreas Gruenbacher cmd = &asender_tbl[pi.cmd]; 52771952e916SAndreas Gruenbacher if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) { 52782fcb8f30SAndreas Gruenbacher conn_err(tconn, "Unexpected meta packet %s (0x%04x)\n", 52792fcb8f30SAndreas Gruenbacher cmdname(pi.cmd), pi.cmd); 5280b411b363SPhilipp Reisner goto disconnect; 5281b411b363SPhilipp Reisner } 5282e658983aSAndreas Gruenbacher expect = header_size + cmd->pkt_size; 528352b061a4SAndreas Gruenbacher if (pi.size != expect - header_size) { 528432862ec7SPhilipp Reisner conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", 528577351055SPhilipp Reisner pi.cmd, pi.size); 5286b411b363SPhilipp Reisner goto reconnect; 5287b411b363SPhilipp Reisner } 5288257d0af6SPhilipp Reisner } 5289b411b363SPhilipp Reisner if (received == expect) { 52902735a594SAndreas Gruenbacher bool err; 5291a4fbda8eSPhilipp Reisner 52922735a594SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 52932735a594SAndreas Gruenbacher if (err) { 52941952e916SAndreas Gruenbacher conn_err(tconn, "%pf failed\n", cmd->fn); 5295b411b363SPhilipp Reisner goto reconnect; 52961952e916SAndreas Gruenbacher } 5297b411b363SPhilipp Reisner 5298a4fbda8eSPhilipp Reisner tconn->last_received = jiffies; 5299a4fbda8eSPhilipp Reisner 530044ed167dSPhilipp Reisner if (cmd == &asender_tbl[P_PING_ACK]) { 530144ed167dSPhilipp Reisner /* restore idle timeout */ 530244ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_int * HZ; 530344ed167dSPhilipp Reisner ping_timeout_active = false; 530444ed167dSPhilipp Reisner } 5305f36af18cSLars Ellenberg 5306e658983aSAndreas Gruenbacher buf = tconn->meta.rbuf; 5307b411b363SPhilipp Reisner received = 0; 530852b061a4SAndreas Gruenbacher expect = header_size; 5309b411b363SPhilipp Reisner cmd = NULL; 5310b411b363SPhilipp Reisner } 5311b411b363SPhilipp Reisner } 5312b411b363SPhilipp Reisner 5313b411b363SPhilipp Reisner if (0) { 5314b411b363SPhilipp Reisner reconnect: 5315bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); 5316b411b363SPhilipp Reisner } 5317b411b363SPhilipp Reisner if (0) { 5318b411b363SPhilipp Reisner disconnect: 5319bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 5320b411b363SPhilipp Reisner } 532132862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5322b411b363SPhilipp Reisner 532332862ec7SPhilipp Reisner conn_info(tconn, "asender terminated\n"); 5324b411b363SPhilipp Reisner 5325b411b363SPhilipp Reisner return 0; 5326b411b363SPhilipp Reisner } 5327