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 51b411b363SPhilipp Reisner enum finish_epoch { 52b411b363SPhilipp Reisner FE_STILL_LIVE, 53b411b363SPhilipp Reisner FE_DESTROYED, 54b411b363SPhilipp Reisner FE_RECYCLED, 55b411b363SPhilipp Reisner }; 56b411b363SPhilipp Reisner 57b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev); 58b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev); 59b411b363SPhilipp Reisner 60b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); 61b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *, struct drbd_work *, int); 62b411b363SPhilipp Reisner 63b411b363SPhilipp Reisner 64b411b363SPhilipp Reisner #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) 65b411b363SPhilipp Reisner 6645bb912bSLars Ellenberg /* 6745bb912bSLars Ellenberg * some helper functions to deal with single linked page lists, 6845bb912bSLars Ellenberg * page->private being our "next" pointer. 6945bb912bSLars Ellenberg */ 7045bb912bSLars Ellenberg 7145bb912bSLars Ellenberg /* If at least n pages are linked at head, get n pages off. 7245bb912bSLars Ellenberg * Otherwise, don't modify head, and return NULL. 7345bb912bSLars Ellenberg * Locking is the responsibility of the caller. 7445bb912bSLars Ellenberg */ 7545bb912bSLars Ellenberg static struct page *page_chain_del(struct page **head, int n) 7645bb912bSLars Ellenberg { 7745bb912bSLars Ellenberg struct page *page; 7845bb912bSLars Ellenberg struct page *tmp; 7945bb912bSLars Ellenberg 8045bb912bSLars Ellenberg BUG_ON(!n); 8145bb912bSLars Ellenberg BUG_ON(!head); 8245bb912bSLars Ellenberg 8345bb912bSLars Ellenberg page = *head; 8423ce4227SPhilipp Reisner 8523ce4227SPhilipp Reisner if (!page) 8623ce4227SPhilipp Reisner return NULL; 8723ce4227SPhilipp Reisner 8845bb912bSLars Ellenberg while (page) { 8945bb912bSLars Ellenberg tmp = page_chain_next(page); 9045bb912bSLars Ellenberg if (--n == 0) 9145bb912bSLars Ellenberg break; /* found sufficient pages */ 9245bb912bSLars Ellenberg if (tmp == NULL) 9345bb912bSLars Ellenberg /* insufficient pages, don't use any of them. */ 9445bb912bSLars Ellenberg return NULL; 9545bb912bSLars Ellenberg page = tmp; 9645bb912bSLars Ellenberg } 9745bb912bSLars Ellenberg 9845bb912bSLars Ellenberg /* add end of list marker for the returned list */ 9945bb912bSLars Ellenberg set_page_private(page, 0); 10045bb912bSLars Ellenberg /* actual return value, and adjustment of head */ 10145bb912bSLars Ellenberg page = *head; 10245bb912bSLars Ellenberg *head = tmp; 10345bb912bSLars Ellenberg return page; 10445bb912bSLars Ellenberg } 10545bb912bSLars Ellenberg 10645bb912bSLars Ellenberg /* may be used outside of locks to find the tail of a (usually short) 10745bb912bSLars Ellenberg * "private" page chain, before adding it back to a global chain head 10845bb912bSLars Ellenberg * with page_chain_add() under a spinlock. */ 10945bb912bSLars Ellenberg static struct page *page_chain_tail(struct page *page, int *len) 11045bb912bSLars Ellenberg { 11145bb912bSLars Ellenberg struct page *tmp; 11245bb912bSLars Ellenberg int i = 1; 11345bb912bSLars Ellenberg while ((tmp = page_chain_next(page))) 11445bb912bSLars Ellenberg ++i, page = tmp; 11545bb912bSLars Ellenberg if (len) 11645bb912bSLars Ellenberg *len = i; 11745bb912bSLars Ellenberg return page; 11845bb912bSLars Ellenberg } 11945bb912bSLars Ellenberg 12045bb912bSLars Ellenberg static int page_chain_free(struct page *page) 12145bb912bSLars Ellenberg { 12245bb912bSLars Ellenberg struct page *tmp; 12345bb912bSLars Ellenberg int i = 0; 12445bb912bSLars Ellenberg page_chain_for_each_safe(page, tmp) { 12545bb912bSLars Ellenberg put_page(page); 12645bb912bSLars Ellenberg ++i; 12745bb912bSLars Ellenberg } 12845bb912bSLars Ellenberg return i; 12945bb912bSLars Ellenberg } 13045bb912bSLars Ellenberg 13145bb912bSLars Ellenberg static void page_chain_add(struct page **head, 13245bb912bSLars Ellenberg struct page *chain_first, struct page *chain_last) 13345bb912bSLars Ellenberg { 13445bb912bSLars Ellenberg #if 1 13545bb912bSLars Ellenberg struct page *tmp; 13645bb912bSLars Ellenberg tmp = page_chain_tail(chain_first, NULL); 13745bb912bSLars Ellenberg BUG_ON(tmp != chain_last); 13845bb912bSLars Ellenberg #endif 13945bb912bSLars Ellenberg 14045bb912bSLars Ellenberg /* add chain to head */ 14145bb912bSLars Ellenberg set_page_private(chain_last, (unsigned long)*head); 14245bb912bSLars Ellenberg *head = chain_first; 14345bb912bSLars Ellenberg } 14445bb912bSLars Ellenberg 14545bb912bSLars Ellenberg static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number) 146b411b363SPhilipp Reisner { 147b411b363SPhilipp Reisner struct page *page = NULL; 14845bb912bSLars Ellenberg struct page *tmp = NULL; 14945bb912bSLars Ellenberg int i = 0; 150b411b363SPhilipp Reisner 151b411b363SPhilipp Reisner /* Yes, testing drbd_pp_vacant outside the lock is racy. 152b411b363SPhilipp Reisner * So what. It saves a spin_lock. */ 15345bb912bSLars Ellenberg if (drbd_pp_vacant >= number) { 154b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 15545bb912bSLars Ellenberg page = page_chain_del(&drbd_pp_pool, number); 15645bb912bSLars Ellenberg if (page) 15745bb912bSLars Ellenberg drbd_pp_vacant -= number; 158b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 15945bb912bSLars Ellenberg if (page) 16045bb912bSLars Ellenberg return page; 161b411b363SPhilipp Reisner } 16245bb912bSLars Ellenberg 163b411b363SPhilipp Reisner /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD 164b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 165b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 16645bb912bSLars Ellenberg for (i = 0; i < number; i++) { 16745bb912bSLars Ellenberg tmp = alloc_page(GFP_TRY); 16845bb912bSLars Ellenberg if (!tmp) 16945bb912bSLars Ellenberg break; 17045bb912bSLars Ellenberg set_page_private(tmp, (unsigned long)page); 17145bb912bSLars Ellenberg page = tmp; 17245bb912bSLars Ellenberg } 17345bb912bSLars Ellenberg 17445bb912bSLars Ellenberg if (i == number) 175b411b363SPhilipp Reisner return page; 17645bb912bSLars Ellenberg 17745bb912bSLars Ellenberg /* Not enough pages immediately available this time. 17845bb912bSLars Ellenberg * No need to jump around here, drbd_pp_alloc will retry this 17945bb912bSLars Ellenberg * function "soon". */ 18045bb912bSLars Ellenberg if (page) { 18145bb912bSLars Ellenberg tmp = page_chain_tail(page, NULL); 18245bb912bSLars Ellenberg spin_lock(&drbd_pp_lock); 18345bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 18445bb912bSLars Ellenberg drbd_pp_vacant += i; 18545bb912bSLars Ellenberg spin_unlock(&drbd_pp_lock); 18645bb912bSLars Ellenberg } 18745bb912bSLars Ellenberg return NULL; 188b411b363SPhilipp Reisner } 189b411b363SPhilipp Reisner 190b411b363SPhilipp Reisner static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed) 191b411b363SPhilipp Reisner { 192b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 193b411b363SPhilipp Reisner struct list_head *le, *tle; 194b411b363SPhilipp Reisner 195b411b363SPhilipp Reisner /* The EEs are always appended to the end of the list. Since 196b411b363SPhilipp Reisner they are sent in order over the wire, they have to finish 197b411b363SPhilipp Reisner in order. As soon as we see the first not finished we can 198b411b363SPhilipp Reisner stop to examine the list... */ 199b411b363SPhilipp Reisner 200b411b363SPhilipp Reisner list_for_each_safe(le, tle, &mdev->net_ee) { 201b411b363SPhilipp Reisner e = list_entry(le, struct drbd_epoch_entry, w.list); 20245bb912bSLars Ellenberg if (drbd_ee_has_active_page(e)) 203b411b363SPhilipp Reisner break; 204b411b363SPhilipp Reisner list_move(le, to_be_freed); 205b411b363SPhilipp Reisner } 206b411b363SPhilipp Reisner } 207b411b363SPhilipp Reisner 208b411b363SPhilipp Reisner static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) 209b411b363SPhilipp Reisner { 210b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 211b411b363SPhilipp Reisner struct drbd_epoch_entry *e, *t; 212b411b363SPhilipp Reisner 213b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 214b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 215b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 216b411b363SPhilipp Reisner 217b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &reclaimed, w.list) 218435f0740SLars Ellenberg drbd_free_net_ee(mdev, e); 219b411b363SPhilipp Reisner } 220b411b363SPhilipp Reisner 221b411b363SPhilipp Reisner /** 22245bb912bSLars Ellenberg * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled) 223b411b363SPhilipp Reisner * @mdev: DRBD device. 22445bb912bSLars Ellenberg * @number: number of pages requested 22545bb912bSLars Ellenberg * @retry: whether to retry, if not enough pages are available right now 226b411b363SPhilipp Reisner * 22745bb912bSLars Ellenberg * Tries to allocate number pages, first from our own page pool, then from 22845bb912bSLars Ellenberg * the kernel, unless this allocation would exceed the max_buffers setting. 22945bb912bSLars Ellenberg * Possibly retry until DRBD frees sufficient pages somewhere else. 23045bb912bSLars Ellenberg * 23145bb912bSLars Ellenberg * Returns a page chain linked via page->private. 232b411b363SPhilipp Reisner */ 23345bb912bSLars Ellenberg static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry) 234b411b363SPhilipp Reisner { 235b411b363SPhilipp Reisner struct page *page = NULL; 236b411b363SPhilipp Reisner DEFINE_WAIT(wait); 237b411b363SPhilipp Reisner 23845bb912bSLars Ellenberg /* Yes, we may run up to @number over max_buffers. If we 23945bb912bSLars Ellenberg * follow it strictly, the admin will get it wrong anyways. */ 24045bb912bSLars Ellenberg if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) 24145bb912bSLars Ellenberg page = drbd_pp_first_pages_or_try_alloc(mdev, number); 242b411b363SPhilipp Reisner 24345bb912bSLars Ellenberg while (page == NULL) { 244b411b363SPhilipp Reisner prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); 245b411b363SPhilipp Reisner 246b411b363SPhilipp Reisner drbd_kick_lo_and_reclaim_net(mdev); 247b411b363SPhilipp Reisner 248b411b363SPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) { 24945bb912bSLars Ellenberg page = drbd_pp_first_pages_or_try_alloc(mdev, number); 250b411b363SPhilipp Reisner if (page) 251b411b363SPhilipp Reisner break; 252b411b363SPhilipp Reisner } 253b411b363SPhilipp Reisner 254b411b363SPhilipp Reisner if (!retry) 255b411b363SPhilipp Reisner break; 256b411b363SPhilipp Reisner 257b411b363SPhilipp Reisner if (signal_pending(current)) { 258b411b363SPhilipp Reisner dev_warn(DEV, "drbd_pp_alloc interrupted!\n"); 259b411b363SPhilipp Reisner break; 260b411b363SPhilipp Reisner } 261b411b363SPhilipp Reisner 262b411b363SPhilipp Reisner schedule(); 263b411b363SPhilipp Reisner } 264b411b363SPhilipp Reisner finish_wait(&drbd_pp_wait, &wait); 265b411b363SPhilipp Reisner 26645bb912bSLars Ellenberg if (page) 26745bb912bSLars Ellenberg atomic_add(number, &mdev->pp_in_use); 268b411b363SPhilipp Reisner return page; 269b411b363SPhilipp Reisner } 270b411b363SPhilipp Reisner 271b411b363SPhilipp Reisner /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc. 27245bb912bSLars Ellenberg * Is also used from inside an other spin_lock_irq(&mdev->req_lock); 27345bb912bSLars Ellenberg * Either links the page chain back to the global pool, 27445bb912bSLars Ellenberg * or returns all pages to the system. */ 275435f0740SLars Ellenberg static void drbd_pp_free(struct drbd_conf *mdev, struct page *page, int is_net) 276b411b363SPhilipp Reisner { 277435f0740SLars Ellenberg atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use; 278b411b363SPhilipp Reisner int i; 279435f0740SLars Ellenberg 2801816a2b4SLars Ellenberg if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE)*minor_count) 28145bb912bSLars Ellenberg i = page_chain_free(page); 28245bb912bSLars Ellenberg else { 28345bb912bSLars Ellenberg struct page *tmp; 28445bb912bSLars Ellenberg tmp = page_chain_tail(page, &i); 285b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 28645bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 28745bb912bSLars Ellenberg drbd_pp_vacant += i; 288b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 289b411b363SPhilipp Reisner } 290435f0740SLars Ellenberg i = atomic_sub_return(i, a); 29145bb912bSLars Ellenberg if (i < 0) 292435f0740SLars Ellenberg dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n", 293435f0740SLars Ellenberg is_net ? "pp_in_use_by_net" : "pp_in_use", i); 294b411b363SPhilipp Reisner wake_up(&drbd_pp_wait); 295b411b363SPhilipp Reisner } 296b411b363SPhilipp Reisner 297b411b363SPhilipp Reisner /* 298b411b363SPhilipp Reisner You need to hold the req_lock: 299b411b363SPhilipp Reisner _drbd_wait_ee_list_empty() 300b411b363SPhilipp Reisner 301b411b363SPhilipp Reisner You must not have the req_lock: 302b411b363SPhilipp Reisner drbd_free_ee() 303b411b363SPhilipp Reisner drbd_alloc_ee() 304b411b363SPhilipp Reisner drbd_init_ee() 305b411b363SPhilipp Reisner drbd_release_ee() 306b411b363SPhilipp Reisner drbd_ee_fix_bhs() 307b411b363SPhilipp Reisner drbd_process_done_ee() 308b411b363SPhilipp Reisner drbd_clear_done_ee() 309b411b363SPhilipp Reisner drbd_wait_ee_list_empty() 310b411b363SPhilipp Reisner */ 311b411b363SPhilipp Reisner 312b411b363SPhilipp Reisner struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev, 313b411b363SPhilipp Reisner u64 id, 314b411b363SPhilipp Reisner sector_t sector, 315b411b363SPhilipp Reisner unsigned int data_size, 316b411b363SPhilipp Reisner gfp_t gfp_mask) __must_hold(local) 317b411b363SPhilipp Reisner { 318b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 319b411b363SPhilipp Reisner struct page *page; 32045bb912bSLars Ellenberg unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; 321b411b363SPhilipp Reisner 3220cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE)) 323b411b363SPhilipp Reisner return NULL; 324b411b363SPhilipp Reisner 325b411b363SPhilipp Reisner e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); 326b411b363SPhilipp Reisner if (!e) { 327b411b363SPhilipp Reisner if (!(gfp_mask & __GFP_NOWARN)) 328b411b363SPhilipp Reisner dev_err(DEV, "alloc_ee: Allocation of an EE failed\n"); 329b411b363SPhilipp Reisner return NULL; 330b411b363SPhilipp Reisner } 331b411b363SPhilipp Reisner 33245bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); 33345bb912bSLars Ellenberg if (!page) 33445bb912bSLars Ellenberg goto fail; 335b411b363SPhilipp Reisner 33624c4830cSBart Van Assche INIT_HLIST_NODE(&e->collision); 337b411b363SPhilipp Reisner e->epoch = NULL; 33845bb912bSLars Ellenberg e->mdev = mdev; 33945bb912bSLars Ellenberg e->pages = page; 34045bb912bSLars Ellenberg atomic_set(&e->pending_bios, 0); 34145bb912bSLars Ellenberg e->size = data_size; 342b411b363SPhilipp Reisner e->flags = 0; 34345bb912bSLars Ellenberg e->sector = sector; 34445bb912bSLars Ellenberg e->block_id = id; 345b411b363SPhilipp Reisner 346b411b363SPhilipp Reisner return e; 347b411b363SPhilipp Reisner 34845bb912bSLars Ellenberg fail: 349b411b363SPhilipp Reisner mempool_free(e, drbd_ee_mempool); 350b411b363SPhilipp Reisner return NULL; 351b411b363SPhilipp Reisner } 352b411b363SPhilipp Reisner 353435f0740SLars Ellenberg void drbd_free_some_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, int is_net) 354b411b363SPhilipp Reisner { 355c36c3cedSLars Ellenberg if (e->flags & EE_HAS_DIGEST) 356c36c3cedSLars Ellenberg kfree(e->digest); 357435f0740SLars Ellenberg drbd_pp_free(mdev, e->pages, is_net); 35845bb912bSLars Ellenberg D_ASSERT(atomic_read(&e->pending_bios) == 0); 35924c4830cSBart Van Assche D_ASSERT(hlist_unhashed(&e->collision)); 360b411b363SPhilipp Reisner mempool_free(e, drbd_ee_mempool); 361b411b363SPhilipp Reisner } 362b411b363SPhilipp Reisner 363b411b363SPhilipp Reisner int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list) 364b411b363SPhilipp Reisner { 365b411b363SPhilipp Reisner LIST_HEAD(work_list); 366b411b363SPhilipp Reisner struct drbd_epoch_entry *e, *t; 367b411b363SPhilipp Reisner int count = 0; 368435f0740SLars Ellenberg int is_net = list == &mdev->net_ee; 369b411b363SPhilipp Reisner 370b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 371b411b363SPhilipp Reisner list_splice_init(list, &work_list); 372b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 373b411b363SPhilipp Reisner 374b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &work_list, w.list) { 375435f0740SLars Ellenberg drbd_free_some_ee(mdev, e, is_net); 376b411b363SPhilipp Reisner count++; 377b411b363SPhilipp Reisner } 378b411b363SPhilipp Reisner return count; 379b411b363SPhilipp Reisner } 380b411b363SPhilipp Reisner 381b411b363SPhilipp Reisner 382b411b363SPhilipp Reisner /* 383b411b363SPhilipp Reisner * This function is called from _asender only_ 384b411b363SPhilipp Reisner * but see also comments in _req_mod(,barrier_acked) 385b411b363SPhilipp Reisner * and receive_Barrier. 386b411b363SPhilipp Reisner * 387b411b363SPhilipp Reisner * Move entries from net_ee to done_ee, if ready. 388b411b363SPhilipp Reisner * Grab done_ee, call all callbacks, free the entries. 389b411b363SPhilipp Reisner * The callbacks typically send out ACKs. 390b411b363SPhilipp Reisner */ 391b411b363SPhilipp Reisner static int drbd_process_done_ee(struct drbd_conf *mdev) 392b411b363SPhilipp Reisner { 393b411b363SPhilipp Reisner LIST_HEAD(work_list); 394b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 395b411b363SPhilipp Reisner struct drbd_epoch_entry *e, *t; 396b411b363SPhilipp Reisner int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS); 397b411b363SPhilipp Reisner 398b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 399b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 400b411b363SPhilipp Reisner list_splice_init(&mdev->done_ee, &work_list); 401b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 402b411b363SPhilipp Reisner 403b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &reclaimed, w.list) 404435f0740SLars Ellenberg drbd_free_net_ee(mdev, e); 405b411b363SPhilipp Reisner 406b411b363SPhilipp Reisner /* possible callbacks here: 407b411b363SPhilipp Reisner * e_end_block, and e_end_resync_block, e_send_discard_ack. 408b411b363SPhilipp Reisner * all ignore the last argument. 409b411b363SPhilipp Reisner */ 410b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &work_list, w.list) { 411b411b363SPhilipp Reisner /* list_del not necessary, next/prev members not touched */ 412b411b363SPhilipp Reisner ok = e->w.cb(mdev, &e->w, !ok) && ok; 413b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 414b411b363SPhilipp Reisner } 415b411b363SPhilipp Reisner wake_up(&mdev->ee_wait); 416b411b363SPhilipp Reisner 417b411b363SPhilipp Reisner return ok; 418b411b363SPhilipp Reisner } 419b411b363SPhilipp Reisner 420b411b363SPhilipp Reisner void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 421b411b363SPhilipp Reisner { 422b411b363SPhilipp Reisner DEFINE_WAIT(wait); 423b411b363SPhilipp Reisner 424b411b363SPhilipp Reisner /* avoids spin_lock/unlock 425b411b363SPhilipp Reisner * and calling prepare_to_wait in the fast path */ 426b411b363SPhilipp Reisner while (!list_empty(head)) { 427b411b363SPhilipp Reisner prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); 428b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4297eaceaccSJens Axboe io_schedule(); 430b411b363SPhilipp Reisner finish_wait(&mdev->ee_wait, &wait); 431b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 432b411b363SPhilipp Reisner } 433b411b363SPhilipp Reisner } 434b411b363SPhilipp Reisner 435b411b363SPhilipp Reisner void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 436b411b363SPhilipp Reisner { 437b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 438b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, head); 439b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 440b411b363SPhilipp Reisner } 441b411b363SPhilipp Reisner 442b411b363SPhilipp Reisner /* see also kernel_accept; which is only present since 2.6.18. 443b411b363SPhilipp Reisner * also we want to log which part of it failed, exactly */ 444b411b363SPhilipp Reisner static int drbd_accept(struct drbd_conf *mdev, const char **what, 445b411b363SPhilipp Reisner struct socket *sock, struct socket **newsock) 446b411b363SPhilipp Reisner { 447b411b363SPhilipp Reisner struct sock *sk = sock->sk; 448b411b363SPhilipp Reisner int err = 0; 449b411b363SPhilipp Reisner 450b411b363SPhilipp Reisner *what = "listen"; 451b411b363SPhilipp Reisner err = sock->ops->listen(sock, 5); 452b411b363SPhilipp Reisner if (err < 0) 453b411b363SPhilipp Reisner goto out; 454b411b363SPhilipp Reisner 455b411b363SPhilipp Reisner *what = "sock_create_lite"; 456b411b363SPhilipp Reisner err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 457b411b363SPhilipp Reisner newsock); 458b411b363SPhilipp Reisner if (err < 0) 459b411b363SPhilipp Reisner goto out; 460b411b363SPhilipp Reisner 461b411b363SPhilipp Reisner *what = "accept"; 462b411b363SPhilipp Reisner err = sock->ops->accept(sock, *newsock, 0); 463b411b363SPhilipp Reisner if (err < 0) { 464b411b363SPhilipp Reisner sock_release(*newsock); 465b411b363SPhilipp Reisner *newsock = NULL; 466b411b363SPhilipp Reisner goto out; 467b411b363SPhilipp Reisner } 468b411b363SPhilipp Reisner (*newsock)->ops = sock->ops; 469b411b363SPhilipp Reisner 470b411b363SPhilipp Reisner out: 471b411b363SPhilipp Reisner return err; 472b411b363SPhilipp Reisner } 473b411b363SPhilipp Reisner 474b411b363SPhilipp Reisner static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock, 475b411b363SPhilipp Reisner void *buf, size_t size, int flags) 476b411b363SPhilipp Reisner { 477b411b363SPhilipp Reisner mm_segment_t oldfs; 478b411b363SPhilipp Reisner struct kvec iov = { 479b411b363SPhilipp Reisner .iov_base = buf, 480b411b363SPhilipp Reisner .iov_len = size, 481b411b363SPhilipp Reisner }; 482b411b363SPhilipp Reisner struct msghdr msg = { 483b411b363SPhilipp Reisner .msg_iovlen = 1, 484b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 485b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 486b411b363SPhilipp Reisner }; 487b411b363SPhilipp Reisner int rv; 488b411b363SPhilipp Reisner 489b411b363SPhilipp Reisner oldfs = get_fs(); 490b411b363SPhilipp Reisner set_fs(KERNEL_DS); 491b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 492b411b363SPhilipp Reisner set_fs(oldfs); 493b411b363SPhilipp Reisner 494b411b363SPhilipp Reisner return rv; 495b411b363SPhilipp Reisner } 496b411b363SPhilipp Reisner 497b411b363SPhilipp Reisner static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size) 498b411b363SPhilipp Reisner { 499b411b363SPhilipp Reisner mm_segment_t oldfs; 500b411b363SPhilipp Reisner struct kvec iov = { 501b411b363SPhilipp Reisner .iov_base = buf, 502b411b363SPhilipp Reisner .iov_len = size, 503b411b363SPhilipp Reisner }; 504b411b363SPhilipp Reisner struct msghdr msg = { 505b411b363SPhilipp Reisner .msg_iovlen = 1, 506b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 507b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 508b411b363SPhilipp Reisner }; 509b411b363SPhilipp Reisner int rv; 510b411b363SPhilipp Reisner 511b411b363SPhilipp Reisner oldfs = get_fs(); 512b411b363SPhilipp Reisner set_fs(KERNEL_DS); 513b411b363SPhilipp Reisner 514b411b363SPhilipp Reisner for (;;) { 515b411b363SPhilipp Reisner rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags); 516b411b363SPhilipp Reisner if (rv == size) 517b411b363SPhilipp Reisner break; 518b411b363SPhilipp Reisner 519b411b363SPhilipp Reisner /* Note: 520b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 521b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 522b411b363SPhilipp Reisner */ 523b411b363SPhilipp Reisner 524b411b363SPhilipp Reisner if (rv < 0) { 525b411b363SPhilipp Reisner if (rv == -ECONNRESET) 526b411b363SPhilipp Reisner dev_info(DEV, "sock was reset by peer\n"); 527b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 528b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 529b411b363SPhilipp Reisner break; 530b411b363SPhilipp Reisner } else if (rv == 0) { 531b411b363SPhilipp Reisner dev_info(DEV, "sock was shut down by peer\n"); 532b411b363SPhilipp Reisner break; 533b411b363SPhilipp Reisner } else { 534b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 535b411b363SPhilipp Reisner * after we read a partial message 536b411b363SPhilipp Reisner */ 537b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 538b411b363SPhilipp Reisner break; 539b411b363SPhilipp Reisner } 540b411b363SPhilipp Reisner }; 541b411b363SPhilipp Reisner 542b411b363SPhilipp Reisner set_fs(oldfs); 543b411b363SPhilipp Reisner 544b411b363SPhilipp Reisner if (rv != size) 545b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); 546b411b363SPhilipp Reisner 547b411b363SPhilipp Reisner return rv; 548b411b363SPhilipp Reisner } 549b411b363SPhilipp Reisner 5505dbf1673SLars Ellenberg /* quoting tcp(7): 5515dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5525dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5535dbf1673SLars Ellenberg * This is our wrapper to do so. 5545dbf1673SLars Ellenberg */ 5555dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 5565dbf1673SLars Ellenberg unsigned int rcv) 5575dbf1673SLars Ellenberg { 5585dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 5595dbf1673SLars Ellenberg if (snd) { 5605dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 5615dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 5625dbf1673SLars Ellenberg } 5635dbf1673SLars Ellenberg if (rcv) { 5645dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 5655dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 5665dbf1673SLars Ellenberg } 5675dbf1673SLars Ellenberg } 5685dbf1673SLars Ellenberg 569b411b363SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_conf *mdev) 570b411b363SPhilipp Reisner { 571b411b363SPhilipp Reisner const char *what; 572b411b363SPhilipp Reisner struct socket *sock; 573b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 574b411b363SPhilipp Reisner int err; 575b411b363SPhilipp Reisner int disconnect_on_error = 1; 576b411b363SPhilipp Reisner 577b411b363SPhilipp Reisner if (!get_net_conf(mdev)) 578b411b363SPhilipp Reisner return NULL; 579b411b363SPhilipp Reisner 580b411b363SPhilipp Reisner what = "sock_create_kern"; 581b411b363SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, 582b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 583b411b363SPhilipp Reisner if (err < 0) { 584b411b363SPhilipp Reisner sock = NULL; 585b411b363SPhilipp Reisner goto out; 586b411b363SPhilipp Reisner } 587b411b363SPhilipp Reisner 588b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 589b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ; 5905dbf1673SLars Ellenberg drbd_setbufsize(sock, mdev->net_conf->sndbuf_size, 5915dbf1673SLars Ellenberg mdev->net_conf->rcvbuf_size); 592b411b363SPhilipp Reisner 593b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 594b411b363SPhilipp Reisner * for the outgoing connections. 595b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 596b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 597b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 598b411b363SPhilipp Reisner * a free one dynamically. 599b411b363SPhilipp Reisner */ 600b411b363SPhilipp Reisner memcpy(&src_in6, mdev->net_conf->my_addr, 601b411b363SPhilipp Reisner min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6))); 602b411b363SPhilipp Reisner if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6) 603b411b363SPhilipp Reisner src_in6.sin6_port = 0; 604b411b363SPhilipp Reisner else 605b411b363SPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 606b411b363SPhilipp Reisner 607b411b363SPhilipp Reisner what = "bind before connect"; 608b411b363SPhilipp Reisner err = sock->ops->bind(sock, 609b411b363SPhilipp Reisner (struct sockaddr *) &src_in6, 610b411b363SPhilipp Reisner mdev->net_conf->my_addr_len); 611b411b363SPhilipp Reisner if (err < 0) 612b411b363SPhilipp Reisner goto out; 613b411b363SPhilipp Reisner 614b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 615b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 616b411b363SPhilipp Reisner disconnect_on_error = 0; 617b411b363SPhilipp Reisner what = "connect"; 618b411b363SPhilipp Reisner err = sock->ops->connect(sock, 619b411b363SPhilipp Reisner (struct sockaddr *)mdev->net_conf->peer_addr, 620b411b363SPhilipp Reisner mdev->net_conf->peer_addr_len, 0); 621b411b363SPhilipp Reisner 622b411b363SPhilipp Reisner out: 623b411b363SPhilipp Reisner if (err < 0) { 624b411b363SPhilipp Reisner if (sock) { 625b411b363SPhilipp Reisner sock_release(sock); 626b411b363SPhilipp Reisner sock = NULL; 627b411b363SPhilipp Reisner } 628b411b363SPhilipp Reisner switch (-err) { 629b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 630b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 631b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 632b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 633b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 634b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 635b411b363SPhilipp Reisner disconnect_on_error = 0; 636b411b363SPhilipp Reisner break; 637b411b363SPhilipp Reisner default: 638b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 639b411b363SPhilipp Reisner } 640b411b363SPhilipp Reisner if (disconnect_on_error) 641b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 642b411b363SPhilipp Reisner } 643b411b363SPhilipp Reisner put_net_conf(mdev); 644b411b363SPhilipp Reisner return sock; 645b411b363SPhilipp Reisner } 646b411b363SPhilipp Reisner 647b411b363SPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev) 648b411b363SPhilipp Reisner { 649b411b363SPhilipp Reisner int timeo, err; 650b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 651b411b363SPhilipp Reisner const char *what; 652b411b363SPhilipp Reisner 653b411b363SPhilipp Reisner if (!get_net_conf(mdev)) 654b411b363SPhilipp Reisner return NULL; 655b411b363SPhilipp Reisner 656b411b363SPhilipp Reisner what = "sock_create_kern"; 657b411b363SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, 658b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 659b411b363SPhilipp Reisner if (err) { 660b411b363SPhilipp Reisner s_listen = NULL; 661b411b363SPhilipp Reisner goto out; 662b411b363SPhilipp Reisner } 663b411b363SPhilipp Reisner 664b411b363SPhilipp Reisner timeo = mdev->net_conf->try_connect_int * HZ; 665b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 666b411b363SPhilipp Reisner 667b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 668b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 669b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 6705dbf1673SLars Ellenberg drbd_setbufsize(s_listen, mdev->net_conf->sndbuf_size, 6715dbf1673SLars Ellenberg mdev->net_conf->rcvbuf_size); 672b411b363SPhilipp Reisner 673b411b363SPhilipp Reisner what = "bind before listen"; 674b411b363SPhilipp Reisner err = s_listen->ops->bind(s_listen, 675b411b363SPhilipp Reisner (struct sockaddr *) mdev->net_conf->my_addr, 676b411b363SPhilipp Reisner mdev->net_conf->my_addr_len); 677b411b363SPhilipp Reisner if (err < 0) 678b411b363SPhilipp Reisner goto out; 679b411b363SPhilipp Reisner 680b411b363SPhilipp Reisner err = drbd_accept(mdev, &what, s_listen, &s_estab); 681b411b363SPhilipp Reisner 682b411b363SPhilipp Reisner out: 683b411b363SPhilipp Reisner if (s_listen) 684b411b363SPhilipp Reisner sock_release(s_listen); 685b411b363SPhilipp Reisner if (err < 0) { 686b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 687b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 688b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 689b411b363SPhilipp Reisner } 690b411b363SPhilipp Reisner } 691b411b363SPhilipp Reisner put_net_conf(mdev); 692b411b363SPhilipp Reisner 693b411b363SPhilipp Reisner return s_estab; 694b411b363SPhilipp Reisner } 695b411b363SPhilipp Reisner 696b411b363SPhilipp Reisner static int drbd_send_fp(struct drbd_conf *mdev, 697b411b363SPhilipp Reisner struct socket *sock, enum drbd_packets cmd) 698b411b363SPhilipp Reisner { 69902918be2SPhilipp Reisner struct p_header80 *h = &mdev->data.sbuf.header.h80; 700b411b363SPhilipp Reisner 701b411b363SPhilipp Reisner return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0); 702b411b363SPhilipp Reisner } 703b411b363SPhilipp Reisner 704b411b363SPhilipp Reisner static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock) 705b411b363SPhilipp Reisner { 70602918be2SPhilipp Reisner struct p_header80 *h = &mdev->data.rbuf.header.h80; 707b411b363SPhilipp Reisner int rr; 708b411b363SPhilipp Reisner 709b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0); 710b411b363SPhilipp Reisner 711b411b363SPhilipp Reisner if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC) 712b411b363SPhilipp Reisner return be16_to_cpu(h->command); 713b411b363SPhilipp Reisner 714b411b363SPhilipp Reisner return 0xffff; 715b411b363SPhilipp Reisner } 716b411b363SPhilipp Reisner 717b411b363SPhilipp Reisner /** 718b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 719b411b363SPhilipp Reisner * @mdev: DRBD device. 720b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 721b411b363SPhilipp Reisner */ 722b411b363SPhilipp Reisner static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock) 723b411b363SPhilipp Reisner { 724b411b363SPhilipp Reisner int rr; 725b411b363SPhilipp Reisner char tb[4]; 726b411b363SPhilipp Reisner 727b411b363SPhilipp Reisner if (!*sock) 72881e84650SAndreas Gruenbacher return false; 729b411b363SPhilipp Reisner 730b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 731b411b363SPhilipp Reisner 732b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 73381e84650SAndreas Gruenbacher return true; 734b411b363SPhilipp Reisner } else { 735b411b363SPhilipp Reisner sock_release(*sock); 736b411b363SPhilipp Reisner *sock = NULL; 73781e84650SAndreas Gruenbacher return false; 738b411b363SPhilipp Reisner } 739b411b363SPhilipp Reisner } 740b411b363SPhilipp Reisner 741b411b363SPhilipp Reisner /* 742b411b363SPhilipp Reisner * return values: 743b411b363SPhilipp Reisner * 1 yes, we have a valid connection 744b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 745b411b363SPhilipp Reisner * -1 peer talks different language, 746b411b363SPhilipp Reisner * no point in trying again, please go standalone. 747b411b363SPhilipp Reisner * -2 We do not have a network config... 748b411b363SPhilipp Reisner */ 749b411b363SPhilipp Reisner static int drbd_connect(struct drbd_conf *mdev) 750b411b363SPhilipp Reisner { 751b411b363SPhilipp Reisner struct socket *s, *sock, *msock; 752b411b363SPhilipp Reisner int try, h, ok; 753b411b363SPhilipp Reisner 754b411b363SPhilipp Reisner D_ASSERT(!mdev->data.socket); 755b411b363SPhilipp Reisner 756b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS) 757b411b363SPhilipp Reisner return -2; 758b411b363SPhilipp Reisner 759b411b363SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &mdev->flags); 760b411b363SPhilipp Reisner 761b411b363SPhilipp Reisner sock = NULL; 762b411b363SPhilipp Reisner msock = NULL; 763b411b363SPhilipp Reisner 764b411b363SPhilipp Reisner do { 765b411b363SPhilipp Reisner for (try = 0;;) { 766b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 767b411b363SPhilipp Reisner s = drbd_try_connect(mdev); 768b411b363SPhilipp Reisner if (s || ++try >= 3) 769b411b363SPhilipp Reisner break; 770b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 77120ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 772b411b363SPhilipp Reisner } 773b411b363SPhilipp Reisner 774b411b363SPhilipp Reisner if (s) { 775b411b363SPhilipp Reisner if (!sock) { 776b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_S); 777b411b363SPhilipp Reisner sock = s; 778b411b363SPhilipp Reisner s = NULL; 779b411b363SPhilipp Reisner } else if (!msock) { 780b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_M); 781b411b363SPhilipp Reisner msock = s; 782b411b363SPhilipp Reisner s = NULL; 783b411b363SPhilipp Reisner } else { 784b411b363SPhilipp Reisner dev_err(DEV, "Logic error in drbd_connect()\n"); 785b411b363SPhilipp Reisner goto out_release_sockets; 786b411b363SPhilipp Reisner } 787b411b363SPhilipp Reisner } 788b411b363SPhilipp Reisner 789b411b363SPhilipp Reisner if (sock && msock) { 790a8e40792SPhilipp Reisner schedule_timeout_interruptible(mdev->net_conf->ping_timeo*HZ/10); 791b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 792b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 793b411b363SPhilipp Reisner if (ok) 794b411b363SPhilipp Reisner break; 795b411b363SPhilipp Reisner } 796b411b363SPhilipp Reisner 797b411b363SPhilipp Reisner retry: 798b411b363SPhilipp Reisner s = drbd_wait_for_connect(mdev); 799b411b363SPhilipp Reisner if (s) { 800b411b363SPhilipp Reisner try = drbd_recv_fp(mdev, s); 801b411b363SPhilipp Reisner drbd_socket_okay(mdev, &sock); 802b411b363SPhilipp Reisner drbd_socket_okay(mdev, &msock); 803b411b363SPhilipp Reisner switch (try) { 804b411b363SPhilipp Reisner case P_HAND_SHAKE_S: 805b411b363SPhilipp Reisner if (sock) { 806b411b363SPhilipp Reisner dev_warn(DEV, "initial packet S crossed\n"); 807b411b363SPhilipp Reisner sock_release(sock); 808b411b363SPhilipp Reisner } 809b411b363SPhilipp Reisner sock = s; 810b411b363SPhilipp Reisner break; 811b411b363SPhilipp Reisner case P_HAND_SHAKE_M: 812b411b363SPhilipp Reisner if (msock) { 813b411b363SPhilipp Reisner dev_warn(DEV, "initial packet M crossed\n"); 814b411b363SPhilipp Reisner sock_release(msock); 815b411b363SPhilipp Reisner } 816b411b363SPhilipp Reisner msock = s; 817b411b363SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &mdev->flags); 818b411b363SPhilipp Reisner break; 819b411b363SPhilipp Reisner default: 820b411b363SPhilipp Reisner dev_warn(DEV, "Error receiving initial packet\n"); 821b411b363SPhilipp Reisner sock_release(s); 822b411b363SPhilipp Reisner if (random32() & 1) 823b411b363SPhilipp Reisner goto retry; 824b411b363SPhilipp Reisner } 825b411b363SPhilipp Reisner } 826b411b363SPhilipp Reisner 827b411b363SPhilipp Reisner if (mdev->state.conn <= C_DISCONNECTING) 828b411b363SPhilipp Reisner goto out_release_sockets; 829b411b363SPhilipp Reisner if (signal_pending(current)) { 830b411b363SPhilipp Reisner flush_signals(current); 831b411b363SPhilipp Reisner smp_rmb(); 832b411b363SPhilipp Reisner if (get_t_state(&mdev->receiver) == Exiting) 833b411b363SPhilipp Reisner goto out_release_sockets; 834b411b363SPhilipp Reisner } 835b411b363SPhilipp Reisner 836b411b363SPhilipp Reisner if (sock && msock) { 837b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 838b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 839b411b363SPhilipp Reisner if (ok) 840b411b363SPhilipp Reisner break; 841b411b363SPhilipp Reisner } 842b411b363SPhilipp Reisner } while (1); 843b411b363SPhilipp Reisner 844b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 845b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 846b411b363SPhilipp Reisner 847b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 848b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 849b411b363SPhilipp Reisner 850b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 851b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 852b411b363SPhilipp Reisner 853b411b363SPhilipp Reisner /* NOT YET ... 854b411b363SPhilipp Reisner * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 855b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 856b411b363SPhilipp Reisner * first set it to the P_HAND_SHAKE timeout, 857b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 858b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = 859b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10; 860b411b363SPhilipp Reisner 861b411b363SPhilipp Reisner msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 862b411b363SPhilipp Reisner msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 863b411b363SPhilipp Reisner 864b411b363SPhilipp Reisner /* we don't want delays. 86525985edcSLucas De Marchi * we use TCP_CORK where appropriate, though */ 866b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 867b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 868b411b363SPhilipp Reisner 869b411b363SPhilipp Reisner mdev->data.socket = sock; 870b411b363SPhilipp Reisner mdev->meta.socket = msock; 871b411b363SPhilipp Reisner mdev->last_received = jiffies; 872b411b363SPhilipp Reisner 873b411b363SPhilipp Reisner D_ASSERT(mdev->asender.task == NULL); 874b411b363SPhilipp Reisner 875b411b363SPhilipp Reisner h = drbd_do_handshake(mdev); 876b411b363SPhilipp Reisner if (h <= 0) 877b411b363SPhilipp Reisner return h; 878b411b363SPhilipp Reisner 879b411b363SPhilipp Reisner if (mdev->cram_hmac_tfm) { 880b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 881b10d96cbSJohannes Thoma switch (drbd_do_auth(mdev)) { 882b10d96cbSJohannes Thoma case -1: 883b411b363SPhilipp Reisner dev_err(DEV, "Authentication of peer failed\n"); 884b411b363SPhilipp Reisner return -1; 885b10d96cbSJohannes Thoma case 0: 886b10d96cbSJohannes Thoma dev_err(DEV, "Authentication of peer failed, trying again.\n"); 887b10d96cbSJohannes Thoma return 0; 888b411b363SPhilipp Reisner } 889b411b363SPhilipp Reisner } 890b411b363SPhilipp Reisner 891b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 892b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 893b411b363SPhilipp Reisner 894b411b363SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 895b411b363SPhilipp Reisner mdev->peer_seq = 0; 896b411b363SPhilipp Reisner 897148efa16SPhilipp Reisner if (drbd_send_protocol(mdev) == -1) 8987e2455c1SPhilipp Reisner return -1; 899b411b363SPhilipp Reisner drbd_send_sync_param(mdev, &mdev->sync_conf); 900e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, 0); 901b411b363SPhilipp Reisner drbd_send_uuids(mdev); 902b411b363SPhilipp Reisner drbd_send_state(mdev); 903b411b363SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 904b411b363SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 9051e86ac48SPhilipp Reisner 9061e86ac48SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS) 9071e86ac48SPhilipp Reisner return 0; 9081e86ac48SPhilipp Reisner 9091e86ac48SPhilipp Reisner drbd_thread_start(&mdev->asender); 9107fde2be9SPhilipp Reisner mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ 911b411b363SPhilipp Reisner 912b411b363SPhilipp Reisner return 1; 913b411b363SPhilipp Reisner 914b411b363SPhilipp Reisner out_release_sockets: 915b411b363SPhilipp Reisner if (sock) 916b411b363SPhilipp Reisner sock_release(sock); 917b411b363SPhilipp Reisner if (msock) 918b411b363SPhilipp Reisner sock_release(msock); 919b411b363SPhilipp Reisner return -1; 920b411b363SPhilipp Reisner } 921b411b363SPhilipp Reisner 92202918be2SPhilipp Reisner static int drbd_recv_header(struct drbd_conf *mdev, enum drbd_packets *cmd, unsigned int *packet_size) 923b411b363SPhilipp Reisner { 92402918be2SPhilipp Reisner union p_header *h = &mdev->data.rbuf.header; 925b411b363SPhilipp Reisner int r; 926b411b363SPhilipp Reisner 927b411b363SPhilipp Reisner r = drbd_recv(mdev, h, sizeof(*h)); 928b411b363SPhilipp Reisner if (unlikely(r != sizeof(*h))) { 9290ddc5549SLars Ellenberg if (!signal_pending(current)) 9300ddc5549SLars Ellenberg dev_warn(DEV, "short read expecting header on sock: r=%d\n", r); 93181e84650SAndreas Gruenbacher return false; 93202918be2SPhilipp Reisner } 93302918be2SPhilipp Reisner 93402918be2SPhilipp Reisner if (likely(h->h80.magic == BE_DRBD_MAGIC)) { 93502918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h80.command); 93602918be2SPhilipp Reisner *packet_size = be16_to_cpu(h->h80.length); 93702918be2SPhilipp Reisner } else if (h->h95.magic == BE_DRBD_MAGIC_BIG) { 93802918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h95.command); 93902918be2SPhilipp Reisner *packet_size = be32_to_cpu(h->h95.length); 94002918be2SPhilipp Reisner } else { 941004352faSLars Ellenberg dev_err(DEV, "magic?? on data m: 0x%08x c: %d l: %d\n", 942004352faSLars Ellenberg be32_to_cpu(h->h80.magic), 943004352faSLars Ellenberg be16_to_cpu(h->h80.command), 944004352faSLars Ellenberg be16_to_cpu(h->h80.length)); 94581e84650SAndreas Gruenbacher return false; 946b411b363SPhilipp Reisner } 947b411b363SPhilipp Reisner mdev->last_received = jiffies; 948b411b363SPhilipp Reisner 94981e84650SAndreas Gruenbacher return true; 950b411b363SPhilipp Reisner } 951b411b363SPhilipp Reisner 9522451fc3bSPhilipp Reisner static void drbd_flush(struct drbd_conf *mdev) 953b411b363SPhilipp Reisner { 954b411b363SPhilipp Reisner int rv; 955b411b363SPhilipp Reisner 956b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 957fbd9b09aSDmitry Monakhov rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, 958dd3932edSChristoph Hellwig NULL); 959b411b363SPhilipp Reisner if (rv) { 960ebd2b0cdSPhilipp Reisner dev_info(DEV, "local disk flush failed with status %d\n", rv); 961b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 962b411b363SPhilipp Reisner * don't try again for ANY return value != 0 963b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 964b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 965b411b363SPhilipp Reisner } 966b411b363SPhilipp Reisner put_ldev(mdev); 967b411b363SPhilipp Reisner } 968b411b363SPhilipp Reisner } 969b411b363SPhilipp Reisner 970b411b363SPhilipp Reisner /** 971b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 972b411b363SPhilipp Reisner * @mdev: DRBD device. 973b411b363SPhilipp Reisner * @epoch: Epoch object. 974b411b363SPhilipp Reisner * @ev: Epoch event. 975b411b363SPhilipp Reisner */ 976b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 977b411b363SPhilipp Reisner struct drbd_epoch *epoch, 978b411b363SPhilipp Reisner enum epoch_event ev) 979b411b363SPhilipp Reisner { 9802451fc3bSPhilipp Reisner int epoch_size; 981b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 982b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 983b411b363SPhilipp Reisner 984b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 985b411b363SPhilipp Reisner do { 986b411b363SPhilipp Reisner next_epoch = NULL; 987b411b363SPhilipp Reisner 988b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 989b411b363SPhilipp Reisner 990b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 991b411b363SPhilipp Reisner case EV_PUT: 992b411b363SPhilipp Reisner atomic_dec(&epoch->active); 993b411b363SPhilipp Reisner break; 994b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 995b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 996b411b363SPhilipp Reisner break; 997b411b363SPhilipp Reisner case EV_BECAME_LAST: 998b411b363SPhilipp Reisner /* nothing to do*/ 999b411b363SPhilipp Reisner break; 1000b411b363SPhilipp Reisner } 1001b411b363SPhilipp Reisner 1002b411b363SPhilipp Reisner if (epoch_size != 0 && 1003b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 100480f9fd55SPhilipp Reisner (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { 1005b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1006b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1007b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1008b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1009b411b363SPhilipp Reisner } 101080f9fd55SPhilipp Reisner if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) 1011b411b363SPhilipp Reisner dec_unacked(mdev); 1012b411b363SPhilipp Reisner 1013b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1014b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1015b411b363SPhilipp Reisner list_del(&epoch->list); 1016b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1017b411b363SPhilipp Reisner mdev->epochs--; 1018b411b363SPhilipp Reisner kfree(epoch); 1019b411b363SPhilipp Reisner 1020b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1021b411b363SPhilipp Reisner rv = FE_DESTROYED; 1022b411b363SPhilipp Reisner } else { 1023b411b363SPhilipp Reisner epoch->flags = 0; 1024b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1025698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1026b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1027b411b363SPhilipp Reisner rv = FE_RECYCLED; 10282451fc3bSPhilipp Reisner wake_up(&mdev->ee_wait); 1029b411b363SPhilipp Reisner } 1030b411b363SPhilipp Reisner } 1031b411b363SPhilipp Reisner 1032b411b363SPhilipp Reisner if (!next_epoch) 1033b411b363SPhilipp Reisner break; 1034b411b363SPhilipp Reisner 1035b411b363SPhilipp Reisner epoch = next_epoch; 1036b411b363SPhilipp Reisner } while (1); 1037b411b363SPhilipp Reisner 1038b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1039b411b363SPhilipp Reisner 1040b411b363SPhilipp Reisner return rv; 1041b411b363SPhilipp Reisner } 1042b411b363SPhilipp Reisner 1043b411b363SPhilipp Reisner /** 1044b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1045b411b363SPhilipp Reisner * @mdev: DRBD device. 1046b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1047b411b363SPhilipp Reisner */ 1048b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1049b411b363SPhilipp Reisner { 1050b411b363SPhilipp Reisner enum write_ordering_e pwo; 1051b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1052b411b363SPhilipp Reisner [WO_none] = "none", 1053b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1054b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1055b411b363SPhilipp Reisner }; 1056b411b363SPhilipp Reisner 1057b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1058b411b363SPhilipp Reisner wo = min(pwo, wo); 1059b411b363SPhilipp Reisner if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) 1060b411b363SPhilipp Reisner wo = WO_drain_io; 1061b411b363SPhilipp Reisner if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) 1062b411b363SPhilipp Reisner wo = WO_none; 1063b411b363SPhilipp Reisner mdev->write_ordering = wo; 10642451fc3bSPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bdev_flush) 1065b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1066b411b363SPhilipp Reisner } 1067b411b363SPhilipp Reisner 1068b411b363SPhilipp Reisner /** 106945bb912bSLars Ellenberg * drbd_submit_ee() 107045bb912bSLars Ellenberg * @mdev: DRBD device. 107145bb912bSLars Ellenberg * @e: epoch entry 107245bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 107310f6d992SLars Ellenberg * 107410f6d992SLars Ellenberg * May spread the pages to multiple bios, 107510f6d992SLars Ellenberg * depending on bio_add_page restrictions. 107610f6d992SLars Ellenberg * 107710f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 107810f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 107910f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 108010f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 108110f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 108210f6d992SLars Ellenberg * on certain Xen deployments. 108345bb912bSLars Ellenberg */ 108445bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 108545bb912bSLars Ellenberg int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, 108645bb912bSLars Ellenberg const unsigned rw, const int fault_type) 108745bb912bSLars Ellenberg { 108845bb912bSLars Ellenberg struct bio *bios = NULL; 108945bb912bSLars Ellenberg struct bio *bio; 109045bb912bSLars Ellenberg struct page *page = e->pages; 109145bb912bSLars Ellenberg sector_t sector = e->sector; 109245bb912bSLars Ellenberg unsigned ds = e->size; 109345bb912bSLars Ellenberg unsigned n_bios = 0; 109445bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 109510f6d992SLars Ellenberg int err = -ENOMEM; 109645bb912bSLars Ellenberg 109745bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 109845bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 109945bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 110045bb912bSLars Ellenberg * request in more than one bio. */ 110145bb912bSLars Ellenberg next_bio: 110245bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 110345bb912bSLars Ellenberg if (!bio) { 110445bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 110545bb912bSLars Ellenberg goto fail; 110645bb912bSLars Ellenberg } 110745bb912bSLars Ellenberg /* > e->sector, unless this is the first bio */ 110845bb912bSLars Ellenberg bio->bi_sector = sector; 110945bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 111045bb912bSLars Ellenberg bio->bi_rw = rw; 111145bb912bSLars Ellenberg bio->bi_private = e; 111245bb912bSLars Ellenberg bio->bi_end_io = drbd_endio_sec; 111345bb912bSLars Ellenberg 111445bb912bSLars Ellenberg bio->bi_next = bios; 111545bb912bSLars Ellenberg bios = bio; 111645bb912bSLars Ellenberg ++n_bios; 111745bb912bSLars Ellenberg 111845bb912bSLars Ellenberg page_chain_for_each(page) { 111945bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 112045bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 112110f6d992SLars Ellenberg /* A single page must always be possible! 112210f6d992SLars Ellenberg * But in case it fails anyways, 112310f6d992SLars Ellenberg * we deal with it, and complain (below). */ 112410f6d992SLars Ellenberg if (bio->bi_vcnt == 0) { 112510f6d992SLars Ellenberg dev_err(DEV, 112610f6d992SLars Ellenberg "bio_add_page failed for len=%u, " 112710f6d992SLars Ellenberg "bi_vcnt=0 (bi_sector=%llu)\n", 112810f6d992SLars Ellenberg len, (unsigned long long)bio->bi_sector); 112910f6d992SLars Ellenberg err = -ENOSPC; 113010f6d992SLars Ellenberg goto fail; 113110f6d992SLars Ellenberg } 113245bb912bSLars Ellenberg goto next_bio; 113345bb912bSLars Ellenberg } 113445bb912bSLars Ellenberg ds -= len; 113545bb912bSLars Ellenberg sector += len >> 9; 113645bb912bSLars Ellenberg --nr_pages; 113745bb912bSLars Ellenberg } 113845bb912bSLars Ellenberg D_ASSERT(page == NULL); 113945bb912bSLars Ellenberg D_ASSERT(ds == 0); 114045bb912bSLars Ellenberg 114145bb912bSLars Ellenberg atomic_set(&e->pending_bios, n_bios); 114245bb912bSLars Ellenberg do { 114345bb912bSLars Ellenberg bio = bios; 114445bb912bSLars Ellenberg bios = bios->bi_next; 114545bb912bSLars Ellenberg bio->bi_next = NULL; 114645bb912bSLars Ellenberg 114745bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 114845bb912bSLars Ellenberg } while (bios); 114945bb912bSLars Ellenberg return 0; 115045bb912bSLars Ellenberg 115145bb912bSLars Ellenberg fail: 115245bb912bSLars Ellenberg while (bios) { 115345bb912bSLars Ellenberg bio = bios; 115445bb912bSLars Ellenberg bios = bios->bi_next; 115545bb912bSLars Ellenberg bio_put(bio); 115645bb912bSLars Ellenberg } 115710f6d992SLars Ellenberg return err; 115845bb912bSLars Ellenberg } 115945bb912bSLars Ellenberg 116002918be2SPhilipp Reisner static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1161b411b363SPhilipp Reisner { 11622451fc3bSPhilipp Reisner int rv; 116302918be2SPhilipp Reisner struct p_barrier *p = &mdev->data.rbuf.barrier; 1164b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1165b411b363SPhilipp Reisner 1166b411b363SPhilipp Reisner inc_unacked(mdev); 1167b411b363SPhilipp Reisner 1168b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1169b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1170b411b363SPhilipp Reisner 1171b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1172b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1173b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1174b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1175b411b363SPhilipp Reisner * completed. */ 1176b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1177b411b363SPhilipp Reisner case WO_none: 1178b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 117981e84650SAndreas Gruenbacher return true; 1180b411b363SPhilipp Reisner 1181b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1182b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1183b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 11842451fc3bSPhilipp Reisner if (epoch) 11852451fc3bSPhilipp Reisner break; 11862451fc3bSPhilipp Reisner else 1187b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 11882451fc3bSPhilipp Reisner /* Fall through */ 11892451fc3bSPhilipp Reisner 11902451fc3bSPhilipp Reisner case WO_bdev_flush: 11912451fc3bSPhilipp Reisner case WO_drain_io: 1192b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 11932451fc3bSPhilipp Reisner drbd_flush(mdev); 11942451fc3bSPhilipp Reisner 11952451fc3bSPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 11962451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 11972451fc3bSPhilipp Reisner if (epoch) 11982451fc3bSPhilipp Reisner break; 1199b411b363SPhilipp Reisner } 1200b411b363SPhilipp Reisner 12012451fc3bSPhilipp Reisner epoch = mdev->current_epoch; 12022451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 12032451fc3bSPhilipp Reisner 12042451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 12052451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1206b411b363SPhilipp Reisner 120781e84650SAndreas Gruenbacher return true; 12082451fc3bSPhilipp Reisner default: 12092451fc3bSPhilipp Reisner dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); 121081e84650SAndreas Gruenbacher return false; 1211b411b363SPhilipp Reisner } 1212b411b363SPhilipp Reisner 1213b411b363SPhilipp Reisner epoch->flags = 0; 1214b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1215b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1216b411b363SPhilipp Reisner 1217b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1218b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1219b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1220b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1221b411b363SPhilipp Reisner mdev->epochs++; 1222b411b363SPhilipp Reisner } else { 1223b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1224b411b363SPhilipp Reisner kfree(epoch); 1225b411b363SPhilipp Reisner } 1226b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1227b411b363SPhilipp Reisner 122881e84650SAndreas Gruenbacher return true; 1229b411b363SPhilipp Reisner } 1230b411b363SPhilipp Reisner 1231b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1232b411b363SPhilipp Reisner * and from receive_Data */ 1233b411b363SPhilipp Reisner static struct drbd_epoch_entry * 1234b411b363SPhilipp Reisner read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local) 1235b411b363SPhilipp Reisner { 12366666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1237b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1238b411b363SPhilipp Reisner struct page *page; 123945bb912bSLars Ellenberg int dgs, ds, rr; 1240b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1241b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 12426b4388acSPhilipp Reisner unsigned long *data; 1243b411b363SPhilipp Reisner 1244b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1245b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1246b411b363SPhilipp Reisner 1247b411b363SPhilipp Reisner if (dgs) { 1248b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1249b411b363SPhilipp Reisner if (rr != dgs) { 12500ddc5549SLars Ellenberg if (!signal_pending(current)) 12510ddc5549SLars Ellenberg dev_warn(DEV, 12520ddc5549SLars Ellenberg "short read receiving data digest: read %d expected %d\n", 1253b411b363SPhilipp Reisner rr, dgs); 1254b411b363SPhilipp Reisner return NULL; 1255b411b363SPhilipp Reisner } 1256b411b363SPhilipp Reisner } 1257b411b363SPhilipp Reisner 1258b411b363SPhilipp Reisner data_size -= dgs; 1259b411b363SPhilipp Reisner 1260d07c9c10SPhilipp Reisner ERR_IF(data_size == 0) return NULL; 1261b411b363SPhilipp Reisner ERR_IF(data_size & 0x1ff) return NULL; 12621816a2b4SLars Ellenberg ERR_IF(data_size > DRBD_MAX_BIO_SIZE) return NULL; 1263b411b363SPhilipp Reisner 12646666032aSLars Ellenberg /* even though we trust out peer, 12656666032aSLars Ellenberg * we sometimes have to double check. */ 12666666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1267fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1268fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 12696666032aSLars Ellenberg (unsigned long long)capacity, 12706666032aSLars Ellenberg (unsigned long long)sector, data_size); 12716666032aSLars Ellenberg return NULL; 12726666032aSLars Ellenberg } 12736666032aSLars Ellenberg 1274b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1275b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1276b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1277b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); 1278b411b363SPhilipp Reisner if (!e) 1279b411b363SPhilipp Reisner return NULL; 128045bb912bSLars Ellenberg 1281b411b363SPhilipp Reisner ds = data_size; 128245bb912bSLars Ellenberg page = e->pages; 128345bb912bSLars Ellenberg page_chain_for_each(page) { 128445bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 12856b4388acSPhilipp Reisner data = kmap(page); 128645bb912bSLars Ellenberg rr = drbd_recv(mdev, data, len); 12870cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 12886b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 12896b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 12906b4388acSPhilipp Reisner } 1291b411b363SPhilipp Reisner kunmap(page); 129245bb912bSLars Ellenberg if (rr != len) { 1293b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 12940ddc5549SLars Ellenberg if (!signal_pending(current)) 1295b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 129645bb912bSLars Ellenberg rr, len); 1297b411b363SPhilipp Reisner return NULL; 1298b411b363SPhilipp Reisner } 1299b411b363SPhilipp Reisner ds -= rr; 1300b411b363SPhilipp Reisner } 1301b411b363SPhilipp Reisner 1302b411b363SPhilipp Reisner if (dgs) { 130345bb912bSLars Ellenberg drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv); 1304b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1305470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1306470be44aSLars Ellenberg (unsigned long long)sector, data_size); 1307b411b363SPhilipp Reisner drbd_bcast_ee(mdev, "digest failed", 1308b411b363SPhilipp Reisner dgs, dig_in, dig_vv, e); 1309b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1310b411b363SPhilipp Reisner return NULL; 1311b411b363SPhilipp Reisner } 1312b411b363SPhilipp Reisner } 1313b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1314b411b363SPhilipp Reisner return e; 1315b411b363SPhilipp Reisner } 1316b411b363SPhilipp Reisner 1317b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1318b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1319b411b363SPhilipp Reisner */ 1320b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1321b411b363SPhilipp Reisner { 1322b411b363SPhilipp Reisner struct page *page; 1323b411b363SPhilipp Reisner int rr, rv = 1; 1324b411b363SPhilipp Reisner void *data; 1325b411b363SPhilipp Reisner 1326c3470cdeSLars Ellenberg if (!data_size) 132781e84650SAndreas Gruenbacher return true; 1328c3470cdeSLars Ellenberg 132945bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, 1, 1); 1330b411b363SPhilipp Reisner 1331b411b363SPhilipp Reisner data = kmap(page); 1332b411b363SPhilipp Reisner while (data_size) { 1333b411b363SPhilipp Reisner rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); 1334b411b363SPhilipp Reisner if (rr != min_t(int, data_size, PAGE_SIZE)) { 1335b411b363SPhilipp Reisner rv = 0; 13360ddc5549SLars Ellenberg if (!signal_pending(current)) 13370ddc5549SLars Ellenberg dev_warn(DEV, 13380ddc5549SLars Ellenberg "short read receiving data: read %d expected %d\n", 1339b411b363SPhilipp Reisner rr, min_t(int, data_size, PAGE_SIZE)); 1340b411b363SPhilipp Reisner break; 1341b411b363SPhilipp Reisner } 1342b411b363SPhilipp Reisner data_size -= rr; 1343b411b363SPhilipp Reisner } 1344b411b363SPhilipp Reisner kunmap(page); 1345435f0740SLars Ellenberg drbd_pp_free(mdev, page, 0); 1346b411b363SPhilipp Reisner return rv; 1347b411b363SPhilipp Reisner } 1348b411b363SPhilipp Reisner 1349b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1350b411b363SPhilipp Reisner sector_t sector, int data_size) 1351b411b363SPhilipp Reisner { 1352b411b363SPhilipp Reisner struct bio_vec *bvec; 1353b411b363SPhilipp Reisner struct bio *bio; 1354b411b363SPhilipp Reisner int dgs, rr, i, expect; 1355b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1356b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 1357b411b363SPhilipp Reisner 1358b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1359b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1360b411b363SPhilipp Reisner 1361b411b363SPhilipp Reisner if (dgs) { 1362b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1363b411b363SPhilipp Reisner if (rr != dgs) { 13640ddc5549SLars Ellenberg if (!signal_pending(current)) 13650ddc5549SLars Ellenberg dev_warn(DEV, 13660ddc5549SLars Ellenberg "short read receiving data reply digest: read %d expected %d\n", 1367b411b363SPhilipp Reisner rr, dgs); 1368b411b363SPhilipp Reisner return 0; 1369b411b363SPhilipp Reisner } 1370b411b363SPhilipp Reisner } 1371b411b363SPhilipp Reisner 1372b411b363SPhilipp Reisner data_size -= dgs; 1373b411b363SPhilipp Reisner 1374b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1375b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1376b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1377b411b363SPhilipp Reisner 1378b411b363SPhilipp Reisner bio = req->master_bio; 1379b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1380b411b363SPhilipp Reisner 1381b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1382b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1383b411b363SPhilipp Reisner rr = drbd_recv(mdev, 1384b411b363SPhilipp Reisner kmap(bvec->bv_page)+bvec->bv_offset, 1385b411b363SPhilipp Reisner expect); 1386b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1387b411b363SPhilipp Reisner if (rr != expect) { 13880ddc5549SLars Ellenberg if (!signal_pending(current)) 1389b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply: " 1390b411b363SPhilipp Reisner "read %d expected %d\n", 1391b411b363SPhilipp Reisner rr, expect); 1392b411b363SPhilipp Reisner return 0; 1393b411b363SPhilipp Reisner } 1394b411b363SPhilipp Reisner data_size -= rr; 1395b411b363SPhilipp Reisner } 1396b411b363SPhilipp Reisner 1397b411b363SPhilipp Reisner if (dgs) { 139845bb912bSLars Ellenberg drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv); 1399b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1400b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 1401b411b363SPhilipp Reisner return 0; 1402b411b363SPhilipp Reisner } 1403b411b363SPhilipp Reisner } 1404b411b363SPhilipp Reisner 1405b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 1406b411b363SPhilipp Reisner return 1; 1407b411b363SPhilipp Reisner } 1408b411b363SPhilipp Reisner 1409b411b363SPhilipp Reisner /* e_end_resync_block() is called via 1410b411b363SPhilipp Reisner * drbd_process_done_ee() by asender only */ 1411b411b363SPhilipp Reisner static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1412b411b363SPhilipp Reisner { 1413b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1414b411b363SPhilipp Reisner sector_t sector = e->sector; 1415b411b363SPhilipp Reisner int ok; 1416b411b363SPhilipp Reisner 141724c4830cSBart Van Assche D_ASSERT(hlist_unhashed(&e->collision)); 1418b411b363SPhilipp Reisner 141945bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1420b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1421b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e); 1422b411b363SPhilipp Reisner } else { 1423b411b363SPhilipp Reisner /* Record failure to sync */ 1424b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, e->size); 1425b411b363SPhilipp Reisner 1426b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1427b411b363SPhilipp Reisner } 1428b411b363SPhilipp Reisner dec_unacked(mdev); 1429b411b363SPhilipp Reisner 1430b411b363SPhilipp Reisner return ok; 1431b411b363SPhilipp Reisner } 1432b411b363SPhilipp Reisner 1433b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1434b411b363SPhilipp Reisner { 1435b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1436b411b363SPhilipp Reisner 1437b411b363SPhilipp Reisner e = read_in_block(mdev, ID_SYNCER, sector, data_size); 143845bb912bSLars Ellenberg if (!e) 143945bb912bSLars Ellenberg goto fail; 1440b411b363SPhilipp Reisner 1441b411b363SPhilipp Reisner dec_rs_pending(mdev); 1442b411b363SPhilipp Reisner 1443b411b363SPhilipp Reisner inc_unacked(mdev); 1444b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1445b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1446b411b363SPhilipp Reisner 144745bb912bSLars Ellenberg e->w.cb = e_end_resync_block; 144845bb912bSLars Ellenberg 1449b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1450b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->sync_ee); 1451b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1452b411b363SPhilipp Reisner 14530f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 145445bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0) 145581e84650SAndreas Gruenbacher return true; 145645bb912bSLars Ellenberg 145710f6d992SLars Ellenberg /* don't care for the reason here */ 145810f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 145922cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 146022cc37a9SLars Ellenberg list_del(&e->w.list); 146122cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 146222cc37a9SLars Ellenberg 146345bb912bSLars Ellenberg drbd_free_ee(mdev, e); 146445bb912bSLars Ellenberg fail: 146545bb912bSLars Ellenberg put_ldev(mdev); 146681e84650SAndreas Gruenbacher return false; 1467b411b363SPhilipp Reisner } 1468b411b363SPhilipp Reisner 146902918be2SPhilipp Reisner static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1470b411b363SPhilipp Reisner { 1471b411b363SPhilipp Reisner struct drbd_request *req; 1472b411b363SPhilipp Reisner sector_t sector; 1473b411b363SPhilipp Reisner int ok; 147402918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1475b411b363SPhilipp Reisner 1476b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1477b411b363SPhilipp Reisner 1478b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1479b411b363SPhilipp Reisner req = _ar_id_to_req(mdev, p->block_id, sector); 1480b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1481b411b363SPhilipp Reisner if (unlikely(!req)) { 1482b411b363SPhilipp Reisner dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n"); 148381e84650SAndreas Gruenbacher return false; 1484b411b363SPhilipp Reisner } 1485b411b363SPhilipp Reisner 148624c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1487b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1488b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1489b411b363SPhilipp Reisner ok = recv_dless_read(mdev, req, sector, data_size); 1490b411b363SPhilipp Reisner 1491b411b363SPhilipp Reisner if (ok) 1492b411b363SPhilipp Reisner req_mod(req, data_received); 1493b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1494b411b363SPhilipp Reisner * I don't think we may complete this just yet 1495b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1496b411b363SPhilipp Reisner 1497b411b363SPhilipp Reisner return ok; 1498b411b363SPhilipp Reisner } 1499b411b363SPhilipp Reisner 150002918be2SPhilipp Reisner static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1501b411b363SPhilipp Reisner { 1502b411b363SPhilipp Reisner sector_t sector; 1503b411b363SPhilipp Reisner int ok; 150402918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1505b411b363SPhilipp Reisner 1506b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1507b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1508b411b363SPhilipp Reisner 1509b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1510b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1511b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1512b411b363SPhilipp Reisner * or in drbd_endio_write_sec. */ 1513b411b363SPhilipp Reisner ok = recv_resync_read(mdev, sector, data_size); 1514b411b363SPhilipp Reisner } else { 1515b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1516b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1517b411b363SPhilipp Reisner 1518b411b363SPhilipp Reisner ok = drbd_drain_block(mdev, data_size); 1519b411b363SPhilipp Reisner 15202b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1521b411b363SPhilipp Reisner } 1522b411b363SPhilipp Reisner 1523778f271dSPhilipp Reisner atomic_add(data_size >> 9, &mdev->rs_sect_in); 1524778f271dSPhilipp Reisner 1525b411b363SPhilipp Reisner return ok; 1526b411b363SPhilipp Reisner } 1527b411b363SPhilipp Reisner 1528b411b363SPhilipp Reisner /* e_end_block() is called via drbd_process_done_ee(). 1529b411b363SPhilipp Reisner * this means this function only runs in the asender thread 1530b411b363SPhilipp Reisner */ 1531b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1532b411b363SPhilipp Reisner { 1533b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1534b411b363SPhilipp Reisner sector_t sector = e->sector; 1535b411b363SPhilipp Reisner int ok = 1, pcmd; 1536b411b363SPhilipp Reisner 1537b411b363SPhilipp Reisner if (mdev->net_conf->wire_protocol == DRBD_PROT_C) { 153845bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1539b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1540b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1541b411b363SPhilipp Reisner e->flags & EE_MAY_SET_IN_SYNC) ? 1542b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 1543b411b363SPhilipp Reisner ok &= drbd_send_ack(mdev, pcmd, e); 1544b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1545b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1546b411b363SPhilipp Reisner } else { 1547b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1548b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1549b411b363SPhilipp Reisner * maybe assert this? */ 1550b411b363SPhilipp Reisner } 1551b411b363SPhilipp Reisner dec_unacked(mdev); 1552b411b363SPhilipp Reisner } 1553b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1554b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 1555b411b363SPhilipp Reisner if (mdev->net_conf->two_primaries) { 1556b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 155724c4830cSBart Van Assche D_ASSERT(!hlist_unhashed(&e->collision)); 155824c4830cSBart Van Assche hlist_del_init(&e->collision); 1559b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1560b411b363SPhilipp Reisner } else { 156124c4830cSBart Van Assche D_ASSERT(hlist_unhashed(&e->collision)); 1562b411b363SPhilipp Reisner } 1563b411b363SPhilipp Reisner 1564b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1565b411b363SPhilipp Reisner 1566b411b363SPhilipp Reisner return ok; 1567b411b363SPhilipp Reisner } 1568b411b363SPhilipp Reisner 1569b411b363SPhilipp Reisner static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1570b411b363SPhilipp Reisner { 1571b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1572b411b363SPhilipp Reisner int ok = 1; 1573b411b363SPhilipp Reisner 1574b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1575b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_DISCARD_ACK, e); 1576b411b363SPhilipp Reisner 1577b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 157824c4830cSBart Van Assche D_ASSERT(!hlist_unhashed(&e->collision)); 157924c4830cSBart Van Assche hlist_del_init(&e->collision); 1580b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1581b411b363SPhilipp Reisner 1582b411b363SPhilipp Reisner dec_unacked(mdev); 1583b411b363SPhilipp Reisner 1584b411b363SPhilipp Reisner return ok; 1585b411b363SPhilipp Reisner } 1586b411b363SPhilipp Reisner 1587b411b363SPhilipp Reisner /* Called from receive_Data. 1588b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1589b411b363SPhilipp Reisner * 1590b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1591b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1592b411b363SPhilipp Reisner * been sent. 1593b411b363SPhilipp Reisner * 1594b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1595b411b363SPhilipp Reisner * 1596b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1597b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1598b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1599b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1600b411b363SPhilipp Reisner * 1601b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1602b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1603b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1604b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1605b411b363SPhilipp Reisner * 1606b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1607b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 1608b411b363SPhilipp Reisner static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) 1609b411b363SPhilipp Reisner { 1610b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1611b411b363SPhilipp Reisner unsigned int p_seq; 1612b411b363SPhilipp Reisner long timeout; 1613b411b363SPhilipp Reisner int ret = 0; 1614b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1615b411b363SPhilipp Reisner for (;;) { 1616b411b363SPhilipp Reisner prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1617b411b363SPhilipp Reisner if (seq_le(packet_seq, mdev->peer_seq+1)) 1618b411b363SPhilipp Reisner break; 1619b411b363SPhilipp Reisner if (signal_pending(current)) { 1620b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1621b411b363SPhilipp Reisner break; 1622b411b363SPhilipp Reisner } 1623b411b363SPhilipp Reisner p_seq = mdev->peer_seq; 1624b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1625b411b363SPhilipp Reisner timeout = schedule_timeout(30*HZ); 1626b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1627b411b363SPhilipp Reisner if (timeout == 0 && p_seq == mdev->peer_seq) { 1628b411b363SPhilipp Reisner ret = -ETIMEDOUT; 1629b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); 1630b411b363SPhilipp Reisner break; 1631b411b363SPhilipp Reisner } 1632b411b363SPhilipp Reisner } 1633b411b363SPhilipp Reisner finish_wait(&mdev->seq_wait, &wait); 1634b411b363SPhilipp Reisner if (mdev->peer_seq+1 == packet_seq) 1635b411b363SPhilipp Reisner mdev->peer_seq++; 1636b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1637b411b363SPhilipp Reisner return ret; 1638b411b363SPhilipp Reisner } 1639b411b363SPhilipp Reisner 1640688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1641688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1642688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1643688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 164476d2e7ecSPhilipp Reisner { 164576d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 164676d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1647688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 164876d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 164976d2e7ecSPhilipp Reisner } 165076d2e7ecSPhilipp Reisner 1651b411b363SPhilipp Reisner /* mirrored write */ 165202918be2SPhilipp Reisner static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1653b411b363SPhilipp Reisner { 1654b411b363SPhilipp Reisner sector_t sector; 1655b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 165602918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1657b411b363SPhilipp Reisner int rw = WRITE; 1658b411b363SPhilipp Reisner u32 dp_flags; 1659b411b363SPhilipp Reisner 1660b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 1661b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1662b411b363SPhilipp Reisner if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) 1663b411b363SPhilipp Reisner mdev->peer_seq++; 1664b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1665b411b363SPhilipp Reisner 16662b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1667b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 1668b411b363SPhilipp Reisner return drbd_drain_block(mdev, data_size); 1669b411b363SPhilipp Reisner } 1670b411b363SPhilipp Reisner 1671b411b363SPhilipp Reisner /* get_ldev(mdev) successful. 1672b411b363SPhilipp Reisner * Corresponding put_ldev done either below (on various errors), 1673b411b363SPhilipp Reisner * or in drbd_endio_write_sec, if we successfully submit the data at 1674b411b363SPhilipp Reisner * the end of this function. */ 1675b411b363SPhilipp Reisner 1676b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1677b411b363SPhilipp Reisner e = read_in_block(mdev, p->block_id, sector, data_size); 1678b411b363SPhilipp Reisner if (!e) { 1679b411b363SPhilipp Reisner put_ldev(mdev); 168081e84650SAndreas Gruenbacher return false; 1681b411b363SPhilipp Reisner } 1682b411b363SPhilipp Reisner 1683b411b363SPhilipp Reisner e->w.cb = e_end_block; 1684b411b363SPhilipp Reisner 1685688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 1686688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 1687688593c5SLars Ellenberg 1688688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 1689688593c5SLars Ellenberg e->flags |= EE_MAY_SET_IN_SYNC; 1690688593c5SLars Ellenberg 1691b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1692b411b363SPhilipp Reisner e->epoch = mdev->current_epoch; 1693b411b363SPhilipp Reisner atomic_inc(&e->epoch->epoch_size); 1694b411b363SPhilipp Reisner atomic_inc(&e->epoch->active); 1695b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1696b411b363SPhilipp Reisner 1697b411b363SPhilipp Reisner /* I'm the receiver, I do hold a net_cnt reference. */ 1698b411b363SPhilipp Reisner if (!mdev->net_conf->two_primaries) { 1699b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1700b411b363SPhilipp Reisner } else { 1701b411b363SPhilipp Reisner /* don't get the req_lock yet, 1702b411b363SPhilipp Reisner * we may sleep in drbd_wait_peer_seq */ 1703b411b363SPhilipp Reisner const int size = e->size; 1704b411b363SPhilipp Reisner const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1705b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1706b411b363SPhilipp Reisner struct drbd_request *i; 1707b411b363SPhilipp Reisner struct hlist_node *n; 1708b411b363SPhilipp Reisner struct hlist_head *slot; 1709b411b363SPhilipp Reisner int first; 1710b411b363SPhilipp Reisner 1711b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1712b411b363SPhilipp Reisner BUG_ON(mdev->ee_hash == NULL); 1713b411b363SPhilipp Reisner BUG_ON(mdev->tl_hash == NULL); 1714b411b363SPhilipp Reisner 1715b411b363SPhilipp Reisner /* conflict detection and handling: 1716b411b363SPhilipp Reisner * 1. wait on the sequence number, 1717b411b363SPhilipp Reisner * in case this data packet overtook ACK packets. 1718b411b363SPhilipp Reisner * 2. check our hash tables for conflicting requests. 1719b411b363SPhilipp Reisner * we only need to walk the tl_hash, since an ee can not 1720b411b363SPhilipp Reisner * have a conflict with an other ee: on the submitting 1721b411b363SPhilipp Reisner * node, the corresponding req had already been conflicting, 1722b411b363SPhilipp Reisner * and a conflicting req is never sent. 1723b411b363SPhilipp Reisner * 1724b411b363SPhilipp Reisner * Note: for two_primaries, we are protocol C, 1725b411b363SPhilipp Reisner * so there cannot be any request that is DONE 1726b411b363SPhilipp Reisner * but still on the transfer log. 1727b411b363SPhilipp Reisner * 1728b411b363SPhilipp Reisner * unconditionally add to the ee_hash. 1729b411b363SPhilipp Reisner * 1730b411b363SPhilipp Reisner * if no conflicting request is found: 1731b411b363SPhilipp Reisner * submit. 1732b411b363SPhilipp Reisner * 1733b411b363SPhilipp Reisner * if any conflicting request is found 1734b411b363SPhilipp Reisner * that has not yet been acked, 1735b411b363SPhilipp Reisner * AND I have the "discard concurrent writes" flag: 1736b411b363SPhilipp Reisner * queue (via done_ee) the P_DISCARD_ACK; OUT. 1737b411b363SPhilipp Reisner * 1738b411b363SPhilipp Reisner * if any conflicting request is found: 1739b411b363SPhilipp Reisner * block the receiver, waiting on misc_wait 1740b411b363SPhilipp Reisner * until no more conflicting requests are there, 1741b411b363SPhilipp Reisner * or we get interrupted (disconnect). 1742b411b363SPhilipp Reisner * 1743b411b363SPhilipp Reisner * we do not just write after local io completion of those 1744b411b363SPhilipp Reisner * requests, but only after req is done completely, i.e. 1745b411b363SPhilipp Reisner * we wait for the P_DISCARD_ACK to arrive! 1746b411b363SPhilipp Reisner * 1747b411b363SPhilipp Reisner * then proceed normally, i.e. submit. 1748b411b363SPhilipp Reisner */ 1749b411b363SPhilipp Reisner if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) 1750b411b363SPhilipp Reisner goto out_interrupted; 1751b411b363SPhilipp Reisner 1752b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1753b411b363SPhilipp Reisner 175424c4830cSBart Van Assche hlist_add_head(&e->collision, ee_hash_slot(mdev, sector)); 1755b411b363SPhilipp Reisner 1756b411b363SPhilipp Reisner #define OVERLAPS overlaps(i->sector, i->size, sector, size) 1757b411b363SPhilipp Reisner slot = tl_hash_slot(mdev, sector); 1758b411b363SPhilipp Reisner first = 1; 1759b411b363SPhilipp Reisner for (;;) { 1760b411b363SPhilipp Reisner int have_unacked = 0; 1761b411b363SPhilipp Reisner int have_conflict = 0; 1762b411b363SPhilipp Reisner prepare_to_wait(&mdev->misc_wait, &wait, 1763b411b363SPhilipp Reisner TASK_INTERRUPTIBLE); 176424c4830cSBart Van Assche hlist_for_each_entry(i, n, slot, collision) { 1765b411b363SPhilipp Reisner if (OVERLAPS) { 1766b411b363SPhilipp Reisner /* only ALERT on first iteration, 1767b411b363SPhilipp Reisner * we may be woken up early... */ 1768b411b363SPhilipp Reisner if (first) 1769b411b363SPhilipp Reisner dev_alert(DEV, "%s[%u] Concurrent local write detected!" 1770b411b363SPhilipp Reisner " new: %llus +%u; pending: %llus +%u\n", 1771b411b363SPhilipp Reisner current->comm, current->pid, 1772b411b363SPhilipp Reisner (unsigned long long)sector, size, 1773b411b363SPhilipp Reisner (unsigned long long)i->sector, i->size); 1774b411b363SPhilipp Reisner if (i->rq_state & RQ_NET_PENDING) 1775b411b363SPhilipp Reisner ++have_unacked; 1776b411b363SPhilipp Reisner ++have_conflict; 1777b411b363SPhilipp Reisner } 1778b411b363SPhilipp Reisner } 1779b411b363SPhilipp Reisner #undef OVERLAPS 1780b411b363SPhilipp Reisner if (!have_conflict) 1781b411b363SPhilipp Reisner break; 1782b411b363SPhilipp Reisner 1783b411b363SPhilipp Reisner /* Discard Ack only for the _first_ iteration */ 1784b411b363SPhilipp Reisner if (first && discard && have_unacked) { 1785b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", 1786b411b363SPhilipp Reisner (unsigned long long)sector); 1787b411b363SPhilipp Reisner inc_unacked(mdev); 1788b411b363SPhilipp Reisner e->w.cb = e_send_discard_ack; 1789b411b363SPhilipp Reisner list_add_tail(&e->w.list, &mdev->done_ee); 1790b411b363SPhilipp Reisner 1791b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1792b411b363SPhilipp Reisner 1793b411b363SPhilipp Reisner /* we could probably send that P_DISCARD_ACK ourselves, 1794b411b363SPhilipp Reisner * but I don't like the receiver using the msock */ 1795b411b363SPhilipp Reisner 1796b411b363SPhilipp Reisner put_ldev(mdev); 1797b411b363SPhilipp Reisner wake_asender(mdev); 1798b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 179981e84650SAndreas Gruenbacher return true; 1800b411b363SPhilipp Reisner } 1801b411b363SPhilipp Reisner 1802b411b363SPhilipp Reisner if (signal_pending(current)) { 180324c4830cSBart Van Assche hlist_del_init(&e->collision); 1804b411b363SPhilipp Reisner 1805b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1806b411b363SPhilipp Reisner 1807b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1808b411b363SPhilipp Reisner goto out_interrupted; 1809b411b363SPhilipp Reisner } 1810b411b363SPhilipp Reisner 1811b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1812b411b363SPhilipp Reisner if (first) { 1813b411b363SPhilipp Reisner first = 0; 1814b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " 1815b411b363SPhilipp Reisner "sec=%llus\n", (unsigned long long)sector); 1816b411b363SPhilipp Reisner } else if (discard) { 1817b411b363SPhilipp Reisner /* we had none on the first iteration. 1818b411b363SPhilipp Reisner * there must be none now. */ 1819b411b363SPhilipp Reisner D_ASSERT(have_unacked == 0); 1820b411b363SPhilipp Reisner } 1821b411b363SPhilipp Reisner schedule(); 1822b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1823b411b363SPhilipp Reisner } 1824b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1825b411b363SPhilipp Reisner } 1826b411b363SPhilipp Reisner 1827b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->active_ee); 1828b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1829b411b363SPhilipp Reisner 1830b411b363SPhilipp Reisner switch (mdev->net_conf->wire_protocol) { 1831b411b363SPhilipp Reisner case DRBD_PROT_C: 1832b411b363SPhilipp Reisner inc_unacked(mdev); 1833b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 1834b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1835b411b363SPhilipp Reisner break; 1836b411b363SPhilipp Reisner case DRBD_PROT_B: 1837b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 1838b411b363SPhilipp Reisner * sends on the msock, but anyways */ 1839b411b363SPhilipp Reisner drbd_send_ack(mdev, P_RECV_ACK, e); 1840b411b363SPhilipp Reisner break; 1841b411b363SPhilipp Reisner case DRBD_PROT_A: 1842b411b363SPhilipp Reisner /* nothing to do */ 1843b411b363SPhilipp Reisner break; 1844b411b363SPhilipp Reisner } 1845b411b363SPhilipp Reisner 18466719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 1847b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 1848b411b363SPhilipp Reisner drbd_set_out_of_sync(mdev, e->sector, e->size); 1849b411b363SPhilipp Reisner e->flags |= EE_CALL_AL_COMPLETE_IO; 18506719fb03SLars Ellenberg e->flags &= ~EE_MAY_SET_IN_SYNC; 1851b411b363SPhilipp Reisner drbd_al_begin_io(mdev, e->sector); 1852b411b363SPhilipp Reisner } 1853b411b363SPhilipp Reisner 185445bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0) 185581e84650SAndreas Gruenbacher return true; 1856b411b363SPhilipp Reisner 185710f6d992SLars Ellenberg /* don't care for the reason here */ 185810f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 185922cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 186022cc37a9SLars Ellenberg list_del(&e->w.list); 186124c4830cSBart Van Assche hlist_del_init(&e->collision); 186222cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 186322cc37a9SLars Ellenberg if (e->flags & EE_CALL_AL_COMPLETE_IO) 186422cc37a9SLars Ellenberg drbd_al_complete_io(mdev, e->sector); 186522cc37a9SLars Ellenberg 1866b411b363SPhilipp Reisner out_interrupted: 186710f6d992SLars Ellenberg drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + EV_CLEANUP); 1868b411b363SPhilipp Reisner put_ldev(mdev); 1869b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 187081e84650SAndreas Gruenbacher return false; 1871b411b363SPhilipp Reisner } 1872b411b363SPhilipp Reisner 18730f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 18740f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 18750f0601f4SLars Ellenberg * 18760f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 18770f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 18780f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 18790f0601f4SLars Ellenberg * activity, it obviously is "busy". 18800f0601f4SLars Ellenberg * 18810f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 18820f0601f4SLars Ellenberg * to have a short time average so we can react faster. 18830f0601f4SLars Ellenberg */ 1884e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 18850f0601f4SLars Ellenberg { 18860f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 18870f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 1888e3555d85SPhilipp Reisner struct lc_element *tmp; 18890f0601f4SLars Ellenberg int curr_events; 18900f0601f4SLars Ellenberg int throttle = 0; 18910f0601f4SLars Ellenberg 18920f0601f4SLars Ellenberg /* feature disabled? */ 18930f0601f4SLars Ellenberg if (mdev->sync_conf.c_min_rate == 0) 18940f0601f4SLars Ellenberg return 0; 18950f0601f4SLars Ellenberg 1896e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 1897e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 1898e3555d85SPhilipp Reisner if (tmp) { 1899e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 1900e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 1901e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1902e3555d85SPhilipp Reisner return 0; 1903e3555d85SPhilipp Reisner } 1904e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 1905e3555d85SPhilipp Reisner } 1906e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1907e3555d85SPhilipp Reisner 19080f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 19090f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 19100f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 1911e3555d85SPhilipp Reisner 19120f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 19130f0601f4SLars Ellenberg unsigned long rs_left; 19140f0601f4SLars Ellenberg int i; 19150f0601f4SLars Ellenberg 19160f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 19170f0601f4SLars Ellenberg 19180f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 19190f0601f4SLars Ellenberg * approx. */ 19202649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 19212649f080SLars Ellenberg 19222649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 19232649f080SLars Ellenberg rs_left = mdev->ov_left; 19242649f080SLars Ellenberg else 19250f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 19260f0601f4SLars Ellenberg 19270f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 19280f0601f4SLars Ellenberg if (!dt) 19290f0601f4SLars Ellenberg dt++; 19300f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 19310f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 19320f0601f4SLars Ellenberg 19330f0601f4SLars Ellenberg if (dbdt > mdev->sync_conf.c_min_rate) 19340f0601f4SLars Ellenberg throttle = 1; 19350f0601f4SLars Ellenberg } 19360f0601f4SLars Ellenberg return throttle; 19370f0601f4SLars Ellenberg } 19380f0601f4SLars Ellenberg 19390f0601f4SLars Ellenberg 194002918be2SPhilipp Reisner static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int digest_size) 1941b411b363SPhilipp Reisner { 1942b411b363SPhilipp Reisner sector_t sector; 1943b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1944b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1945b411b363SPhilipp Reisner struct digest_info *di = NULL; 1946b18b37beSPhilipp Reisner int size, verb; 1947b411b363SPhilipp Reisner unsigned int fault_type; 194802918be2SPhilipp Reisner struct p_block_req *p = &mdev->data.rbuf.block_req; 1949b411b363SPhilipp Reisner 1950b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1951b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 1952b411b363SPhilipp Reisner 19531816a2b4SLars Ellenberg if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) { 1954b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 1955b411b363SPhilipp Reisner (unsigned long long)sector, size); 195681e84650SAndreas Gruenbacher return false; 1957b411b363SPhilipp Reisner } 1958b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 1959b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 1960b411b363SPhilipp Reisner (unsigned long long)sector, size); 196181e84650SAndreas Gruenbacher return false; 1962b411b363SPhilipp Reisner } 1963b411b363SPhilipp Reisner 1964b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 1965b18b37beSPhilipp Reisner verb = 1; 1966b18b37beSPhilipp Reisner switch (cmd) { 1967b18b37beSPhilipp Reisner case P_DATA_REQUEST: 1968b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 1969b18b37beSPhilipp Reisner break; 1970b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 1971b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 1972b18b37beSPhilipp Reisner case P_OV_REQUEST: 1973b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 1974b18b37beSPhilipp Reisner break; 1975b18b37beSPhilipp Reisner case P_OV_REPLY: 1976b18b37beSPhilipp Reisner verb = 0; 1977b18b37beSPhilipp Reisner dec_rs_pending(mdev); 1978b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 1979b18b37beSPhilipp Reisner break; 1980b18b37beSPhilipp Reisner default: 1981b18b37beSPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 1982b18b37beSPhilipp Reisner cmdname(cmd)); 1983b18b37beSPhilipp Reisner } 1984b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 1985b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 1986b411b363SPhilipp Reisner "no local data.\n"); 1987b18b37beSPhilipp Reisner 1988a821cc4aSLars Ellenberg /* drain possibly payload */ 1989a821cc4aSLars Ellenberg return drbd_drain_block(mdev, digest_size); 1990b411b363SPhilipp Reisner } 1991b411b363SPhilipp Reisner 1992b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1993b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1994b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1995b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); 1996b411b363SPhilipp Reisner if (!e) { 1997b411b363SPhilipp Reisner put_ldev(mdev); 199881e84650SAndreas Gruenbacher return false; 1999b411b363SPhilipp Reisner } 2000b411b363SPhilipp Reisner 200102918be2SPhilipp Reisner switch (cmd) { 2002b411b363SPhilipp Reisner case P_DATA_REQUEST: 2003b411b363SPhilipp Reisner e->w.cb = w_e_end_data_req; 2004b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 200580a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 200680a40e43SLars Ellenberg goto submit; 200780a40e43SLars Ellenberg 2008b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2009b411b363SPhilipp Reisner e->w.cb = w_e_end_rsdata_req; 2010b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 20115f9915bbSLars Ellenberg /* used in the sector offset progress display */ 20125f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2013b411b363SPhilipp Reisner break; 2014b411b363SPhilipp Reisner 2015b411b363SPhilipp Reisner case P_OV_REPLY: 2016b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2017b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2018b411b363SPhilipp Reisner di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); 2019b411b363SPhilipp Reisner if (!di) 2020b411b363SPhilipp Reisner goto out_free_e; 2021b411b363SPhilipp Reisner 2022b411b363SPhilipp Reisner di->digest_size = digest_size; 2023b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2024b411b363SPhilipp Reisner 2025c36c3cedSLars Ellenberg e->digest = di; 2026c36c3cedSLars Ellenberg e->flags |= EE_HAS_DIGEST; 2027c36c3cedSLars Ellenberg 2028b411b363SPhilipp Reisner if (drbd_recv(mdev, di->digest, digest_size) != digest_size) 2029b411b363SPhilipp Reisner goto out_free_e; 2030b411b363SPhilipp Reisner 203102918be2SPhilipp Reisner if (cmd == P_CSUM_RS_REQUEST) { 2032b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 2033b411b363SPhilipp Reisner e->w.cb = w_e_end_csum_rs_req; 20345f9915bbSLars Ellenberg /* used in the sector offset progress display */ 20355f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 203602918be2SPhilipp Reisner } else if (cmd == P_OV_REPLY) { 20372649f080SLars Ellenberg /* track progress, we may need to throttle */ 20382649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2039b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_reply; 2040b411b363SPhilipp Reisner dec_rs_pending(mdev); 20410f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 20420f0601f4SLars Ellenberg * but accounting still needs to be done. */ 20430f0601f4SLars Ellenberg goto submit_for_resync; 2044b411b363SPhilipp Reisner } 2045b411b363SPhilipp Reisner break; 2046b411b363SPhilipp Reisner 2047b411b363SPhilipp Reisner case P_OV_REQUEST: 2048b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 2049b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90) { 2050de228bbaSLars Ellenberg unsigned long now = jiffies; 2051de228bbaSLars Ellenberg int i; 2052b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2053b411b363SPhilipp Reisner mdev->ov_position = sector; 205430b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 205530b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2056de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2057de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2058de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2059de228bbaSLars Ellenberg } 2060b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2061b411b363SPhilipp Reisner (unsigned long long)sector); 2062b411b363SPhilipp Reisner } 2063b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_req; 2064b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2065b411b363SPhilipp Reisner break; 2066b411b363SPhilipp Reisner 2067b411b363SPhilipp Reisner default: 2068b411b363SPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 206902918be2SPhilipp Reisner cmdname(cmd)); 2070b411b363SPhilipp Reisner fault_type = DRBD_FAULT_MAX; 207180a40e43SLars Ellenberg goto out_free_e; 2072b411b363SPhilipp Reisner } 2073b411b363SPhilipp Reisner 20740f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 20750f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 20760f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 20770f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 20780f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 20790f0601f4SLars Ellenberg * 20800f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 20810f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 20820f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 20830f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 20840f0601f4SLars Ellenberg * a while, anyways. 20850f0601f4SLars Ellenberg */ 2086b411b363SPhilipp Reisner 20870f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 20880f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 20890f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 20900f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 20910f0601f4SLars Ellenberg * 20920f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 20930f0601f4SLars Ellenberg * we would also throttle its application reads. 20940f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 20950f0601f4SLars Ellenberg */ 2096e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2097e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2098e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 209980a40e43SLars Ellenberg goto out_free_e; 2100b411b363SPhilipp Reisner 21010f0601f4SLars Ellenberg submit_for_resync: 21020f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 21030f0601f4SLars Ellenberg 210480a40e43SLars Ellenberg submit: 2105b411b363SPhilipp Reisner inc_unacked(mdev); 210680a40e43SLars Ellenberg spin_lock_irq(&mdev->req_lock); 210780a40e43SLars Ellenberg list_add_tail(&e->w.list, &mdev->read_ee); 210880a40e43SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 2109b411b363SPhilipp Reisner 211045bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, READ, fault_type) == 0) 211181e84650SAndreas Gruenbacher return true; 2112b411b363SPhilipp Reisner 211310f6d992SLars Ellenberg /* don't care for the reason here */ 211410f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 211522cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 211622cc37a9SLars Ellenberg list_del(&e->w.list); 211722cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 211822cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 211922cc37a9SLars Ellenberg 2120b411b363SPhilipp Reisner out_free_e: 2121b411b363SPhilipp Reisner put_ldev(mdev); 2122b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 212381e84650SAndreas Gruenbacher return false; 2124b411b363SPhilipp Reisner } 2125b411b363SPhilipp Reisner 2126b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2127b411b363SPhilipp Reisner { 2128b411b363SPhilipp Reisner int self, peer, rv = -100; 2129b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 2130b411b363SPhilipp Reisner 2131b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2132b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2133b411b363SPhilipp Reisner 2134b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2135b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2136b411b363SPhilipp Reisner 2137b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_0p) { 2138b411b363SPhilipp Reisner case ASB_CONSENSUS: 2139b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2140b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2141b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2142b411b363SPhilipp Reisner break; 2143b411b363SPhilipp Reisner case ASB_DISCONNECT: 2144b411b363SPhilipp Reisner break; 2145b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2146b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2147b411b363SPhilipp Reisner rv = -1; 2148b411b363SPhilipp Reisner break; 2149b411b363SPhilipp Reisner } 2150b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2151b411b363SPhilipp Reisner rv = 1; 2152b411b363SPhilipp Reisner break; 2153b411b363SPhilipp Reisner } 2154b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2155b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2156b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2157b411b363SPhilipp Reisner rv = 1; 2158b411b363SPhilipp Reisner break; 2159b411b363SPhilipp Reisner } 2160b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2161b411b363SPhilipp Reisner rv = -1; 2162b411b363SPhilipp Reisner break; 2163b411b363SPhilipp Reisner } 2164b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2165ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2166b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2167b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2168b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 2169b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2170b411b363SPhilipp Reisner ? -1 : 1; 2171b411b363SPhilipp Reisner break; 2172b411b363SPhilipp Reisner } else { 2173b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2174b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2175b411b363SPhilipp Reisner } 2176b411b363SPhilipp Reisner if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) 2177b411b363SPhilipp Reisner break; 2178b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2179b411b363SPhilipp Reisner if (ch_self < ch_peer) 2180b411b363SPhilipp Reisner rv = -1; 2181b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2182b411b363SPhilipp Reisner rv = 1; 2183b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2184b411b363SPhilipp Reisner /* Well, then use something else. */ 2185b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2186b411b363SPhilipp Reisner ? -1 : 1; 2187b411b363SPhilipp Reisner break; 2188b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2189b411b363SPhilipp Reisner rv = -1; 2190b411b363SPhilipp Reisner break; 2191b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2192b411b363SPhilipp Reisner rv = 1; 2193b411b363SPhilipp Reisner } 2194b411b363SPhilipp Reisner 2195b411b363SPhilipp Reisner return rv; 2196b411b363SPhilipp Reisner } 2197b411b363SPhilipp Reisner 2198b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2199b411b363SPhilipp Reisner { 22006184ea21SAndreas Gruenbacher int hg, rv = -100; 2201b411b363SPhilipp Reisner 2202b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_1p) { 2203b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2204b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2205b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2206b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2207b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2208b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2209b411b363SPhilipp Reisner break; 2210b411b363SPhilipp Reisner case ASB_DISCONNECT: 2211b411b363SPhilipp Reisner break; 2212b411b363SPhilipp Reisner case ASB_CONSENSUS: 2213b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2214b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2215b411b363SPhilipp Reisner rv = hg; 2216b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2217b411b363SPhilipp Reisner rv = hg; 2218b411b363SPhilipp Reisner break; 2219b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2220b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2221b411b363SPhilipp Reisner break; 2222b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2223b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2224b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2225b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2226b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2227bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2228bb437946SAndreas Gruenbacher 2229bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2230b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2231b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2232b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2233bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2234bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2235b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2236b411b363SPhilipp Reisner } else { 2237b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2238b411b363SPhilipp Reisner rv = hg; 2239b411b363SPhilipp Reisner } 2240b411b363SPhilipp Reisner } else 2241b411b363SPhilipp Reisner rv = hg; 2242b411b363SPhilipp Reisner } 2243b411b363SPhilipp Reisner 2244b411b363SPhilipp Reisner return rv; 2245b411b363SPhilipp Reisner } 2246b411b363SPhilipp Reisner 2247b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2248b411b363SPhilipp Reisner { 22496184ea21SAndreas Gruenbacher int hg, rv = -100; 2250b411b363SPhilipp Reisner 2251b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_2p) { 2252b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2253b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2254b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2255b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2256b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2257b411b363SPhilipp Reisner case ASB_CONSENSUS: 2258b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2259b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2260b411b363SPhilipp Reisner break; 2261b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2262b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2263b411b363SPhilipp Reisner break; 2264b411b363SPhilipp Reisner case ASB_DISCONNECT: 2265b411b363SPhilipp Reisner break; 2266b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2267b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2268b411b363SPhilipp Reisner if (hg == -1) { 2269bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2270bb437946SAndreas Gruenbacher 2271b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2272b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2273b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2274bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2275bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2276b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2277b411b363SPhilipp Reisner } else { 2278b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2279b411b363SPhilipp Reisner rv = hg; 2280b411b363SPhilipp Reisner } 2281b411b363SPhilipp Reisner } else 2282b411b363SPhilipp Reisner rv = hg; 2283b411b363SPhilipp Reisner } 2284b411b363SPhilipp Reisner 2285b411b363SPhilipp Reisner return rv; 2286b411b363SPhilipp Reisner } 2287b411b363SPhilipp Reisner 2288b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2289b411b363SPhilipp Reisner u64 bits, u64 flags) 2290b411b363SPhilipp Reisner { 2291b411b363SPhilipp Reisner if (!uuid) { 2292b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2293b411b363SPhilipp Reisner return; 2294b411b363SPhilipp Reisner } 2295b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2296b411b363SPhilipp Reisner text, 2297b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2298b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2299b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2300b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2301b411b363SPhilipp Reisner (unsigned long long)bits, 2302b411b363SPhilipp Reisner (unsigned long long)flags); 2303b411b363SPhilipp Reisner } 2304b411b363SPhilipp Reisner 2305b411b363SPhilipp Reisner /* 2306b411b363SPhilipp Reisner 100 after split brain try auto recover 2307b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2308b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2309b411b363SPhilipp Reisner 0 no Sync 2310b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2311b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2312b411b363SPhilipp Reisner -100 after split brain, disconnect 2313b411b363SPhilipp Reisner -1000 unrelated data 23144a23f264SPhilipp Reisner -1091 requires proto 91 23154a23f264SPhilipp Reisner -1096 requires proto 96 2316b411b363SPhilipp Reisner */ 2317b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2318b411b363SPhilipp Reisner { 2319b411b363SPhilipp Reisner u64 self, peer; 2320b411b363SPhilipp Reisner int i, j; 2321b411b363SPhilipp Reisner 2322b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2323b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2324b411b363SPhilipp Reisner 2325b411b363SPhilipp Reisner *rule_nr = 10; 2326b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2327b411b363SPhilipp Reisner return 0; 2328b411b363SPhilipp Reisner 2329b411b363SPhilipp Reisner *rule_nr = 20; 2330b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2331b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2332b411b363SPhilipp Reisner return -2; 2333b411b363SPhilipp Reisner 2334b411b363SPhilipp Reisner *rule_nr = 30; 2335b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2336b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2337b411b363SPhilipp Reisner return 2; 2338b411b363SPhilipp Reisner 2339b411b363SPhilipp Reisner if (self == peer) { 2340b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2341b411b363SPhilipp Reisner 2342b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2343b411b363SPhilipp Reisner 2344b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 23454a23f264SPhilipp Reisner return -1091; 2346b411b363SPhilipp Reisner 2347b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2348b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2349b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2350b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2351b411b363SPhilipp Reisner 2352b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2353b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2354b411b363SPhilipp Reisner *rule_nr = 34; 2355b411b363SPhilipp Reisner } else { 2356b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2357b411b363SPhilipp Reisner *rule_nr = 36; 2358b411b363SPhilipp Reisner } 2359b411b363SPhilipp Reisner 2360b411b363SPhilipp Reisner return 1; 2361b411b363SPhilipp Reisner } 2362b411b363SPhilipp Reisner 2363b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2364b411b363SPhilipp Reisner 2365b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 23664a23f264SPhilipp Reisner return -1091; 2367b411b363SPhilipp Reisner 2368b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2369b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2370b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2371b411b363SPhilipp Reisner 2372b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2373b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2374b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2375b411b363SPhilipp Reisner 2376b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2377b411b363SPhilipp Reisner *rule_nr = 35; 2378b411b363SPhilipp Reisner } else { 2379b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2380b411b363SPhilipp Reisner *rule_nr = 37; 2381b411b363SPhilipp Reisner } 2382b411b363SPhilipp Reisner 2383b411b363SPhilipp Reisner return -1; 2384b411b363SPhilipp Reisner } 2385b411b363SPhilipp Reisner 2386b411b363SPhilipp Reisner /* Common power [off|failure] */ 2387b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2388b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2389b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2390b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2391b411b363SPhilipp Reisner *rule_nr = 40; 2392b411b363SPhilipp Reisner 2393b411b363SPhilipp Reisner switch (rct) { 2394b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2395b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2396b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2397b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 2398b411b363SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->flags); 2399b411b363SPhilipp Reisner return dc ? -1 : 1; 2400b411b363SPhilipp Reisner } 2401b411b363SPhilipp Reisner } 2402b411b363SPhilipp Reisner 2403b411b363SPhilipp Reisner *rule_nr = 50; 2404b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2405b411b363SPhilipp Reisner if (self == peer) 2406b411b363SPhilipp Reisner return -1; 2407b411b363SPhilipp Reisner 2408b411b363SPhilipp Reisner *rule_nr = 51; 2409b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2410b411b363SPhilipp Reisner if (self == peer) { 24114a23f264SPhilipp Reisner if (mdev->agreed_pro_version < 96 ? 24124a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 24134a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 24144a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2415b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2416b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2417b411b363SPhilipp Reisner 2418b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 24194a23f264SPhilipp Reisner return -1091; 2420b411b363SPhilipp Reisner 2421b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2422b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 24234a23f264SPhilipp Reisner 24244a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 24254a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 24264a23f264SPhilipp Reisner 2427b411b363SPhilipp Reisner return -1; 2428b411b363SPhilipp Reisner } 2429b411b363SPhilipp Reisner } 2430b411b363SPhilipp Reisner 2431b411b363SPhilipp Reisner *rule_nr = 60; 2432b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2433b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2434b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2435b411b363SPhilipp Reisner if (self == peer) 2436b411b363SPhilipp Reisner return -2; 2437b411b363SPhilipp Reisner } 2438b411b363SPhilipp Reisner 2439b411b363SPhilipp Reisner *rule_nr = 70; 2440b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2441b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2442b411b363SPhilipp Reisner if (self == peer) 2443b411b363SPhilipp Reisner return 1; 2444b411b363SPhilipp Reisner 2445b411b363SPhilipp Reisner *rule_nr = 71; 2446b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2447b411b363SPhilipp Reisner if (self == peer) { 24484a23f264SPhilipp Reisner if (mdev->agreed_pro_version < 96 ? 24494a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 24504a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 24514a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2452b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2453b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2454b411b363SPhilipp Reisner 2455b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 24564a23f264SPhilipp Reisner return -1091; 2457b411b363SPhilipp Reisner 2458b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2459b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2460b411b363SPhilipp Reisner 24614a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2462b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2463b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2464b411b363SPhilipp Reisner 2465b411b363SPhilipp Reisner return 1; 2466b411b363SPhilipp Reisner } 2467b411b363SPhilipp Reisner } 2468b411b363SPhilipp Reisner 2469b411b363SPhilipp Reisner 2470b411b363SPhilipp Reisner *rule_nr = 80; 2471d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2472b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2473b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2474b411b363SPhilipp Reisner if (self == peer) 2475b411b363SPhilipp Reisner return 2; 2476b411b363SPhilipp Reisner } 2477b411b363SPhilipp Reisner 2478b411b363SPhilipp Reisner *rule_nr = 90; 2479b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2480b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2481b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2482b411b363SPhilipp Reisner return 100; 2483b411b363SPhilipp Reisner 2484b411b363SPhilipp Reisner *rule_nr = 100; 2485b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2486b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2487b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2488b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2489b411b363SPhilipp Reisner if (self == peer) 2490b411b363SPhilipp Reisner return -100; 2491b411b363SPhilipp Reisner } 2492b411b363SPhilipp Reisner } 2493b411b363SPhilipp Reisner 2494b411b363SPhilipp Reisner return -1000; 2495b411b363SPhilipp Reisner } 2496b411b363SPhilipp Reisner 2497b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2498b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2499b411b363SPhilipp Reisner */ 2500b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2501b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2502b411b363SPhilipp Reisner { 2503b411b363SPhilipp Reisner int hg, rule_nr; 2504b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2505b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 2506b411b363SPhilipp Reisner 2507b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2508b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2509b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2510b411b363SPhilipp Reisner 2511b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2512b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2513b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2514b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2515b411b363SPhilipp Reisner 2516b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2517b411b363SPhilipp Reisner 2518b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2519b411b363SPhilipp Reisner 2520b411b363SPhilipp Reisner if (hg == -1000) { 2521b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2522b411b363SPhilipp Reisner return C_MASK; 2523b411b363SPhilipp Reisner } 25244a23f264SPhilipp Reisner if (hg < -1000) { 25254a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2526b411b363SPhilipp Reisner return C_MASK; 2527b411b363SPhilipp Reisner } 2528b411b363SPhilipp Reisner 2529b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2530b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2531b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2532b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2533b411b363SPhilipp Reisner if (f) 2534b411b363SPhilipp Reisner hg = hg*2; 2535b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2536b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2537b411b363SPhilipp Reisner } 2538b411b363SPhilipp Reisner 25393a11a487SAdam Gandelman if (abs(hg) == 100) 25403a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 25413a11a487SAdam Gandelman 2542b411b363SPhilipp Reisner if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) { 2543b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2544b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2545b411b363SPhilipp Reisner int forced = (hg == -100); 2546b411b363SPhilipp Reisner 2547b411b363SPhilipp Reisner switch (pcount) { 2548b411b363SPhilipp Reisner case 0: 2549b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2550b411b363SPhilipp Reisner break; 2551b411b363SPhilipp Reisner case 1: 2552b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2553b411b363SPhilipp Reisner break; 2554b411b363SPhilipp Reisner case 2: 2555b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2556b411b363SPhilipp Reisner break; 2557b411b363SPhilipp Reisner } 2558b411b363SPhilipp Reisner if (abs(hg) < 100) { 2559b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2560b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2561b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2562b411b363SPhilipp Reisner if (forced) { 2563b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2564b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2565b411b363SPhilipp Reisner hg = hg*2; 2566b411b363SPhilipp Reisner } 2567b411b363SPhilipp Reisner } 2568b411b363SPhilipp Reisner } 2569b411b363SPhilipp Reisner 2570b411b363SPhilipp Reisner if (hg == -100) { 2571b411b363SPhilipp Reisner if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2572b411b363SPhilipp Reisner hg = -1; 2573b411b363SPhilipp Reisner if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2574b411b363SPhilipp Reisner hg = 1; 2575b411b363SPhilipp Reisner 2576b411b363SPhilipp Reisner if (abs(hg) < 100) 2577b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2578b411b363SPhilipp Reisner "Sync from %s node\n", 2579b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2580b411b363SPhilipp Reisner } 2581b411b363SPhilipp Reisner 2582b411b363SPhilipp Reisner if (hg == -100) { 2583580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2584580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2585580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2586580b9767SLars Ellenberg * to that disk, in a way... */ 25873a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2588b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2589b411b363SPhilipp Reisner return C_MASK; 2590b411b363SPhilipp Reisner } 2591b411b363SPhilipp Reisner 2592b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2593b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2594b411b363SPhilipp Reisner return C_MASK; 2595b411b363SPhilipp Reisner } 2596b411b363SPhilipp Reisner 2597b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2598b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 2599b411b363SPhilipp Reisner switch (mdev->net_conf->rr_conflict) { 2600b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2601b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2602b411b363SPhilipp Reisner /* fall through */ 2603b411b363SPhilipp Reisner case ASB_DISCONNECT: 2604b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2605b411b363SPhilipp Reisner return C_MASK; 2606b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2607b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2608b411b363SPhilipp Reisner "assumption\n"); 2609b411b363SPhilipp Reisner } 2610b411b363SPhilipp Reisner } 2611b411b363SPhilipp Reisner 2612cf14c2e9SPhilipp Reisner if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { 2613cf14c2e9SPhilipp Reisner if (hg == 0) 2614cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2615cf14c2e9SPhilipp Reisner else 2616cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2617cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2618cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2619cf14c2e9SPhilipp Reisner return C_MASK; 2620cf14c2e9SPhilipp Reisner } 2621cf14c2e9SPhilipp Reisner 2622b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2623b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 262420ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 262520ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 2626b411b363SPhilipp Reisner return C_MASK; 2627b411b363SPhilipp Reisner } 2628b411b363SPhilipp Reisner 2629b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2630b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2631b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2632b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2633b411b363SPhilipp Reisner } else { 2634b411b363SPhilipp Reisner rv = C_CONNECTED; 2635b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2636b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2637b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2638b411b363SPhilipp Reisner } 2639b411b363SPhilipp Reisner } 2640b411b363SPhilipp Reisner 2641b411b363SPhilipp Reisner return rv; 2642b411b363SPhilipp Reisner } 2643b411b363SPhilipp Reisner 2644b411b363SPhilipp Reisner /* returns 1 if invalid */ 2645b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2646b411b363SPhilipp Reisner { 2647b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2648b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2649b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2650b411b363SPhilipp Reisner return 0; 2651b411b363SPhilipp Reisner 2652b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2653b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2654b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2655b411b363SPhilipp Reisner return 1; 2656b411b363SPhilipp Reisner 2657b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2658b411b363SPhilipp Reisner if (peer == self) 2659b411b363SPhilipp Reisner return 0; 2660b411b363SPhilipp Reisner 2661b411b363SPhilipp Reisner /* everything es is invalid. */ 2662b411b363SPhilipp Reisner return 1; 2663b411b363SPhilipp Reisner } 2664b411b363SPhilipp Reisner 266502918be2SPhilipp Reisner static int receive_protocol(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 2666b411b363SPhilipp Reisner { 266702918be2SPhilipp Reisner struct p_protocol *p = &mdev->data.rbuf.protocol; 2668b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2669cf14c2e9SPhilipp Reisner int p_want_lose, p_two_primaries, cf; 2670b411b363SPhilipp Reisner char p_integrity_alg[SHARED_SECRET_MAX] = ""; 2671b411b363SPhilipp Reisner 2672b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2673b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 2674b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 2675b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 2676b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 2677cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 2678cf14c2e9SPhilipp Reisner p_want_lose = cf & CF_WANT_LOSE; 2679cf14c2e9SPhilipp Reisner 2680cf14c2e9SPhilipp Reisner clear_bit(CONN_DRY_RUN, &mdev->flags); 2681cf14c2e9SPhilipp Reisner 2682cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 2683cf14c2e9SPhilipp Reisner set_bit(CONN_DRY_RUN, &mdev->flags); 2684b411b363SPhilipp Reisner 2685b411b363SPhilipp Reisner if (p_proto != mdev->net_conf->wire_protocol) { 2686b411b363SPhilipp Reisner dev_err(DEV, "incompatible communication protocols\n"); 2687b411b363SPhilipp Reisner goto disconnect; 2688b411b363SPhilipp Reisner } 2689b411b363SPhilipp Reisner 2690b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) { 2691b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-0pri settings\n"); 2692b411b363SPhilipp Reisner goto disconnect; 2693b411b363SPhilipp Reisner } 2694b411b363SPhilipp Reisner 2695b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) { 2696b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-1pri settings\n"); 2697b411b363SPhilipp Reisner goto disconnect; 2698b411b363SPhilipp Reisner } 2699b411b363SPhilipp Reisner 2700b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) { 2701b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-2pri settings\n"); 2702b411b363SPhilipp Reisner goto disconnect; 2703b411b363SPhilipp Reisner } 2704b411b363SPhilipp Reisner 2705b411b363SPhilipp Reisner if (p_want_lose && mdev->net_conf->want_lose) { 2706b411b363SPhilipp Reisner dev_err(DEV, "both sides have the 'want_lose' flag set\n"); 2707b411b363SPhilipp Reisner goto disconnect; 2708b411b363SPhilipp Reisner } 2709b411b363SPhilipp Reisner 2710b411b363SPhilipp Reisner if (p_two_primaries != mdev->net_conf->two_primaries) { 2711b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the two-primaries options\n"); 2712b411b363SPhilipp Reisner goto disconnect; 2713b411b363SPhilipp Reisner } 2714b411b363SPhilipp Reisner 2715b411b363SPhilipp Reisner if (mdev->agreed_pro_version >= 87) { 2716b411b363SPhilipp Reisner unsigned char *my_alg = mdev->net_conf->integrity_alg; 2717b411b363SPhilipp Reisner 2718b411b363SPhilipp Reisner if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) 271981e84650SAndreas Gruenbacher return false; 2720b411b363SPhilipp Reisner 2721b411b363SPhilipp Reisner p_integrity_alg[SHARED_SECRET_MAX-1] = 0; 2722b411b363SPhilipp Reisner if (strcmp(p_integrity_alg, my_alg)) { 2723b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); 2724b411b363SPhilipp Reisner goto disconnect; 2725b411b363SPhilipp Reisner } 2726b411b363SPhilipp Reisner dev_info(DEV, "data-integrity-alg: %s\n", 2727b411b363SPhilipp Reisner my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); 2728b411b363SPhilipp Reisner } 2729b411b363SPhilipp Reisner 273081e84650SAndreas Gruenbacher return true; 2731b411b363SPhilipp Reisner 2732b411b363SPhilipp Reisner disconnect: 2733b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 273481e84650SAndreas Gruenbacher return false; 2735b411b363SPhilipp Reisner } 2736b411b363SPhilipp Reisner 2737b411b363SPhilipp Reisner /* helper function 2738b411b363SPhilipp Reisner * input: alg name, feature name 2739b411b363SPhilipp Reisner * return: NULL (alg name was "") 2740b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 2741b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 2742b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 2743b411b363SPhilipp Reisner const char *alg, const char *name) 2744b411b363SPhilipp Reisner { 2745b411b363SPhilipp Reisner struct crypto_hash *tfm; 2746b411b363SPhilipp Reisner 2747b411b363SPhilipp Reisner if (!alg[0]) 2748b411b363SPhilipp Reisner return NULL; 2749b411b363SPhilipp Reisner 2750b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 2751b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 2752b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 2753b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 2754b411b363SPhilipp Reisner return tfm; 2755b411b363SPhilipp Reisner } 2756b411b363SPhilipp Reisner if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 2757b411b363SPhilipp Reisner crypto_free_hash(tfm); 2758b411b363SPhilipp Reisner dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); 2759b411b363SPhilipp Reisner return ERR_PTR(-EINVAL); 2760b411b363SPhilipp Reisner } 2761b411b363SPhilipp Reisner return tfm; 2762b411b363SPhilipp Reisner } 2763b411b363SPhilipp Reisner 276402918be2SPhilipp Reisner static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int packet_size) 2765b411b363SPhilipp Reisner { 276681e84650SAndreas Gruenbacher int ok = true; 276702918be2SPhilipp Reisner struct p_rs_param_95 *p = &mdev->data.rbuf.rs_param_95; 2768b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 2769b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 2770b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 2771b411b363SPhilipp Reisner const int apv = mdev->agreed_pro_version; 2772778f271dSPhilipp Reisner int *rs_plan_s = NULL; 2773778f271dSPhilipp Reisner int fifo_size = 0; 2774b411b363SPhilipp Reisner 2775b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 2776b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 2777b411b363SPhilipp Reisner + SHARED_SECRET_MAX 27788e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 27798e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 2780b411b363SPhilipp Reisner 278102918be2SPhilipp Reisner if (packet_size > exp_max_sz) { 2782b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 278302918be2SPhilipp Reisner packet_size, exp_max_sz); 278481e84650SAndreas Gruenbacher return false; 2785b411b363SPhilipp Reisner } 2786b411b363SPhilipp Reisner 2787b411b363SPhilipp Reisner if (apv <= 88) { 278802918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param) - sizeof(struct p_header80); 278902918be2SPhilipp Reisner data_size = packet_size - header_size; 27908e26f9ccSPhilipp Reisner } else if (apv <= 94) { 279102918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header80); 279202918be2SPhilipp Reisner data_size = packet_size - header_size; 2793b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 27948e26f9ccSPhilipp Reisner } else { 279502918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header80); 279602918be2SPhilipp Reisner data_size = packet_size - header_size; 2797b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 2798b411b363SPhilipp Reisner } 2799b411b363SPhilipp Reisner 2800b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 2801b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 2802b411b363SPhilipp Reisner 280302918be2SPhilipp Reisner if (drbd_recv(mdev, &p->head.payload, header_size) != header_size) 280481e84650SAndreas Gruenbacher return false; 2805b411b363SPhilipp Reisner 2806b411b363SPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 2807b411b363SPhilipp Reisner 2808b411b363SPhilipp Reisner if (apv >= 88) { 2809b411b363SPhilipp Reisner if (apv == 88) { 2810b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 2811b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 2812b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 2813b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 281481e84650SAndreas Gruenbacher return false; 2815b411b363SPhilipp Reisner } 2816b411b363SPhilipp Reisner 2817b411b363SPhilipp Reisner if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) 281881e84650SAndreas Gruenbacher return false; 2819b411b363SPhilipp Reisner 2820b411b363SPhilipp Reisner /* we expect NUL terminated string */ 2821b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2822b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 2823b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 2824b411b363SPhilipp Reisner 2825b411b363SPhilipp Reisner } else /* apv >= 89 */ { 2826b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 2827b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2828b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 2829b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 2830b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 2831b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 2832b411b363SPhilipp Reisner } 2833b411b363SPhilipp Reisner 2834b411b363SPhilipp Reisner if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { 2835b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2836b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 2837b411b363SPhilipp Reisner mdev->sync_conf.verify_alg, p->verify_alg); 2838b411b363SPhilipp Reisner goto disconnect; 2839b411b363SPhilipp Reisner } 2840b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 2841b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 2842b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 2843b411b363SPhilipp Reisner verify_tfm = NULL; 2844b411b363SPhilipp Reisner goto disconnect; 2845b411b363SPhilipp Reisner } 2846b411b363SPhilipp Reisner } 2847b411b363SPhilipp Reisner 2848b411b363SPhilipp Reisner if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { 2849b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2850b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 2851b411b363SPhilipp Reisner mdev->sync_conf.csums_alg, p->csums_alg); 2852b411b363SPhilipp Reisner goto disconnect; 2853b411b363SPhilipp Reisner } 2854b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 2855b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 2856b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 2857b411b363SPhilipp Reisner csums_tfm = NULL; 2858b411b363SPhilipp Reisner goto disconnect; 2859b411b363SPhilipp Reisner } 2860b411b363SPhilipp Reisner } 2861b411b363SPhilipp Reisner 28628e26f9ccSPhilipp Reisner if (apv > 94) { 28638e26f9ccSPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 28648e26f9ccSPhilipp Reisner mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 28658e26f9ccSPhilipp Reisner mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target); 28668e26f9ccSPhilipp Reisner mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target); 28678e26f9ccSPhilipp Reisner mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate); 2868778f271dSPhilipp Reisner 2869778f271dSPhilipp Reisner fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 2870778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 2871778f271dSPhilipp Reisner rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 2872778f271dSPhilipp Reisner if (!rs_plan_s) { 2873778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 2874778f271dSPhilipp Reisner goto disconnect; 2875778f271dSPhilipp Reisner } 2876778f271dSPhilipp Reisner } 28778e26f9ccSPhilipp Reisner } 2878b411b363SPhilipp Reisner 2879b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 2880b411b363SPhilipp Reisner /* lock against drbd_nl_syncer_conf() */ 2881b411b363SPhilipp Reisner if (verify_tfm) { 2882b411b363SPhilipp Reisner strcpy(mdev->sync_conf.verify_alg, p->verify_alg); 2883b411b363SPhilipp Reisner mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; 2884b411b363SPhilipp Reisner crypto_free_hash(mdev->verify_tfm); 2885b411b363SPhilipp Reisner mdev->verify_tfm = verify_tfm; 2886b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 2887b411b363SPhilipp Reisner } 2888b411b363SPhilipp Reisner if (csums_tfm) { 2889b411b363SPhilipp Reisner strcpy(mdev->sync_conf.csums_alg, p->csums_alg); 2890b411b363SPhilipp Reisner mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; 2891b411b363SPhilipp Reisner crypto_free_hash(mdev->csums_tfm); 2892b411b363SPhilipp Reisner mdev->csums_tfm = csums_tfm; 2893b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 2894b411b363SPhilipp Reisner } 2895778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size) { 2896778f271dSPhilipp Reisner kfree(mdev->rs_plan_s.values); 2897778f271dSPhilipp Reisner mdev->rs_plan_s.values = rs_plan_s; 2898778f271dSPhilipp Reisner mdev->rs_plan_s.size = fifo_size; 2899778f271dSPhilipp Reisner mdev->rs_planed = 0; 2900778f271dSPhilipp Reisner } 2901b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 2902b411b363SPhilipp Reisner } 2903b411b363SPhilipp Reisner 2904b411b363SPhilipp Reisner return ok; 2905b411b363SPhilipp Reisner disconnect: 2906b411b363SPhilipp Reisner /* just for completeness: actually not needed, 2907b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 2908b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 2909b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 2910b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 2911b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 291281e84650SAndreas Gruenbacher return false; 2913b411b363SPhilipp Reisner } 2914b411b363SPhilipp Reisner 2915b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 2916b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 2917b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 2918b411b363SPhilipp Reisner { 2919b411b363SPhilipp Reisner sector_t d; 2920b411b363SPhilipp Reisner if (a == 0 || b == 0) 2921b411b363SPhilipp Reisner return; 2922b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 2923b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 2924b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 2925b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 2926b411b363SPhilipp Reisner } 2927b411b363SPhilipp Reisner 292802918be2SPhilipp Reisner static int receive_sizes(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 2929b411b363SPhilipp Reisner { 293002918be2SPhilipp Reisner struct p_sizes *p = &mdev->data.rbuf.sizes; 2931b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 2932b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 2933b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 2934e89b591cSPhilipp Reisner enum dds_flags ddsf; 2935b411b363SPhilipp Reisner 2936b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 2937b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 2938b411b363SPhilipp Reisner 2939b411b363SPhilipp Reisner if (p_size == 0 && mdev->state.disk == D_DISKLESS) { 2940b411b363SPhilipp Reisner dev_err(DEV, "some backing storage is needed\n"); 2941b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 294281e84650SAndreas Gruenbacher return false; 2943b411b363SPhilipp Reisner } 2944b411b363SPhilipp Reisner 2945b411b363SPhilipp Reisner /* just store the peer's disk size for now. 2946b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 2947b411b363SPhilipp Reisner mdev->p_size = p_size; 2948b411b363SPhilipp Reisner 2949b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2950b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 2951b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 2952b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 2953b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 2954b411b363SPhilipp Reisner 2955b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 2956b411b363SPhilipp Reisner * param exchange, choose the minimum */ 2957b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 2958b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 2959b411b363SPhilipp Reisner p_usize); 2960b411b363SPhilipp Reisner 2961b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 2962b411b363SPhilipp Reisner 2963b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 2964b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 2965b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 2966b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 2967b411b363SPhilipp Reisner } 2968b411b363SPhilipp Reisner 2969b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 2970b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 2971a393db6fSPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, 0) < 2972b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 2973b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 2974b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 2975b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 2976b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2977b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 2978b411b363SPhilipp Reisner put_ldev(mdev); 297981e84650SAndreas Gruenbacher return false; 2980b411b363SPhilipp Reisner } 2981b411b363SPhilipp Reisner put_ldev(mdev); 2982b411b363SPhilipp Reisner } 2983b411b363SPhilipp Reisner 2984e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 2985b411b363SPhilipp Reisner if (get_ldev(mdev)) { 298624c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 2987b411b363SPhilipp Reisner put_ldev(mdev); 2988b411b363SPhilipp Reisner if (dd == dev_size_error) 298981e84650SAndreas Gruenbacher return false; 2990b411b363SPhilipp Reisner drbd_md_sync(mdev); 2991b411b363SPhilipp Reisner } else { 2992b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 2993b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 2994b411b363SPhilipp Reisner } 2995b411b363SPhilipp Reisner 299699432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 299799432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 299899432fccSPhilipp Reisner 2999b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3000b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3001b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3002b411b363SPhilipp Reisner ldsc = 1; 3003b411b363SPhilipp Reisner } 3004b411b363SPhilipp Reisner 3005b411b363SPhilipp Reisner put_ldev(mdev); 3006b411b363SPhilipp Reisner } 3007b411b363SPhilipp Reisner 3008b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3009b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3010b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3011b411b363SPhilipp Reisner /* we have different sizes, probably peer 3012b411b363SPhilipp Reisner * needs to know my new size... */ 3013e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3014b411b363SPhilipp Reisner } 3015b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3016b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3017b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3018e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3019e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3020e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3021b411b363SPhilipp Reisner else 3022e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3023e89b591cSPhilipp Reisner } else 3024b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3025b411b363SPhilipp Reisner } 3026b411b363SPhilipp Reisner } 3027b411b363SPhilipp Reisner 302881e84650SAndreas Gruenbacher return true; 3029b411b363SPhilipp Reisner } 3030b411b363SPhilipp Reisner 303102918be2SPhilipp Reisner static int receive_uuids(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3032b411b363SPhilipp Reisner { 303302918be2SPhilipp Reisner struct p_uuids *p = &mdev->data.rbuf.uuids; 3034b411b363SPhilipp Reisner u64 *p_uuid; 303562b0da3aSLars Ellenberg int i, updated_uuids = 0; 3036b411b363SPhilipp Reisner 3037b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3038b411b363SPhilipp Reisner 3039b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3040b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3041b411b363SPhilipp Reisner 3042b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3043b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3044b411b363SPhilipp Reisner 3045b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3046b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3047b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3048b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3049b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3050b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 3051b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 305281e84650SAndreas Gruenbacher return false; 3053b411b363SPhilipp Reisner } 3054b411b363SPhilipp Reisner 3055b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3056b411b363SPhilipp Reisner int skip_initial_sync = 3057b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 3058b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90 && 3059b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3060b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3061b411b363SPhilipp Reisner if (skip_initial_sync) { 3062b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3063b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 306420ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 306520ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3066b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3067b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3068b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3069b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3070b411b363SPhilipp Reisner drbd_md_sync(mdev); 307162b0da3aSLars Ellenberg updated_uuids = 1; 3072b411b363SPhilipp Reisner } 3073b411b363SPhilipp Reisner put_ldev(mdev); 307418a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 307518a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 307618a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 307718a50fa2SPhilipp Reisner for me. */ 307862b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3079b411b363SPhilipp Reisner } 3080b411b363SPhilipp Reisner 3081b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3082b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3083b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3084b411b363SPhilipp Reisner new disk state... */ 3085b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); 3086b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 308762b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 308862b0da3aSLars Ellenberg 308962b0da3aSLars Ellenberg if (updated_uuids) 309062b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3091b411b363SPhilipp Reisner 309281e84650SAndreas Gruenbacher return true; 3093b411b363SPhilipp Reisner } 3094b411b363SPhilipp Reisner 3095b411b363SPhilipp Reisner /** 3096b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3097b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3098b411b363SPhilipp Reisner */ 3099b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3100b411b363SPhilipp Reisner { 3101b411b363SPhilipp Reisner union drbd_state ms; 3102b411b363SPhilipp Reisner 3103b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3104b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3105b411b363SPhilipp Reisner 3106b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3107b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3108b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3109b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3110b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3111b411b363SPhilipp Reisner }; 3112b411b363SPhilipp Reisner 3113b411b363SPhilipp Reisner ms.i = ps.i; 3114b411b363SPhilipp Reisner 3115b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3116b411b363SPhilipp Reisner ms.peer = ps.role; 3117b411b363SPhilipp Reisner ms.role = ps.peer; 3118b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3119b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3120b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3121b411b363SPhilipp Reisner 3122b411b363SPhilipp Reisner return ms; 3123b411b363SPhilipp Reisner } 3124b411b363SPhilipp Reisner 312502918be2SPhilipp Reisner static int receive_req_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3126b411b363SPhilipp Reisner { 312702918be2SPhilipp Reisner struct p_req_state *p = &mdev->data.rbuf.req_state; 3128b411b363SPhilipp Reisner union drbd_state mask, val; 3129bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3130b411b363SPhilipp Reisner 3131b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3132b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3133b411b363SPhilipp Reisner 3134b411b363SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->flags) && 3135b411b363SPhilipp Reisner test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { 3136b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 313781e84650SAndreas Gruenbacher return true; 3138b411b363SPhilipp Reisner } 3139b411b363SPhilipp Reisner 3140b411b363SPhilipp Reisner mask = convert_state(mask); 3141b411b363SPhilipp Reisner val = convert_state(val); 3142b411b363SPhilipp Reisner 3143b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3144b411b363SPhilipp Reisner 3145b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3146b411b363SPhilipp Reisner drbd_md_sync(mdev); 3147b411b363SPhilipp Reisner 314881e84650SAndreas Gruenbacher return true; 3149b411b363SPhilipp Reisner } 3150b411b363SPhilipp Reisner 315102918be2SPhilipp Reisner static int receive_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3152b411b363SPhilipp Reisner { 315302918be2SPhilipp Reisner struct p_state *p = &mdev->data.rbuf.state; 31544ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3155b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 315665d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3157b411b363SPhilipp Reisner int rv; 3158b411b363SPhilipp Reisner 3159b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3160b411b363SPhilipp Reisner 3161b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3162b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3163b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3164b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3165b411b363SPhilipp Reisner } 3166b411b363SPhilipp Reisner 3167b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3168b411b363SPhilipp Reisner retry: 31694ac4aadaSLars Ellenberg os = ns = mdev->state; 3170b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3171b411b363SPhilipp Reisner 3172e9ef7bb6SLars Ellenberg /* peer says his disk is uptodate, while we think it is inconsistent, 3173e9ef7bb6SLars Ellenberg * and this happens while we think we have a sync going on. */ 3174e9ef7bb6SLars Ellenberg if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && 3175e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3176e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3177e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3178e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3179e9ef7bb6SLars Ellenberg * syncing states. 3180e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3181e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3182e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3183e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3184e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3185e9ef7bb6SLars Ellenberg 3186e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3187e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3188e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3189e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3190e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3191e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3192e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 319381e84650SAndreas Gruenbacher return true; 3194e9ef7bb6SLars Ellenberg } 3195e9ef7bb6SLars Ellenberg } 3196e9ef7bb6SLars Ellenberg 3197e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3198e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3199e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3200e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3201e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3202e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3203e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3204e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3205e9ef7bb6SLars Ellenberg 32064ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 32074ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3208b411b363SPhilipp Reisner 320967531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 321067531718SPhilipp Reisner ns.conn = C_BEHIND; 321167531718SPhilipp Reisner 3212b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3213b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3214b411b363SPhilipp Reisner int cr; /* consider resync */ 3215b411b363SPhilipp Reisner 3216b411b363SPhilipp Reisner /* if we established a new connection */ 32174ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3218b411b363SPhilipp Reisner /* if we had an established connection 3219b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 32204ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3221b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 32224ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3223b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3224b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3225b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3226b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3227b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 32284ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3229b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3230b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3231b411b363SPhilipp Reisner 3232b411b363SPhilipp Reisner if (cr) 32334ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3234b411b363SPhilipp Reisner 3235b411b363SPhilipp Reisner put_ldev(mdev); 32364ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 32374ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3238b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 323982f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3240b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3241b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3242b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3243580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3244b411b363SPhilipp Reisner } else { 3245cf14c2e9SPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) 324681e84650SAndreas Gruenbacher return false; 32474ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 3248b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 324981e84650SAndreas Gruenbacher return false; 3250b411b363SPhilipp Reisner } 3251b411b363SPhilipp Reisner } 3252b411b363SPhilipp Reisner } 3253b411b363SPhilipp Reisner 3254b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 32554ac4aadaSLars Ellenberg if (mdev->state.i != os.i) 3256b411b363SPhilipp Reisner goto retry; 3257b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3258b411b363SPhilipp Reisner ns.peer = peer_state.role; 3259b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3260b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 32614ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3262b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 32634ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 32644ac4aadaSLars Ellenberg if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3265481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 3266481c6f50SPhilipp Reisner /* Do not allow tl_restart(resend) for a rebooted peer. We can only allow this 3267481c6f50SPhilipp Reisner for temporal network outages! */ 3268481c6f50SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3269481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 3270481c6f50SPhilipp Reisner tl_clear(mdev); 3271481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3272481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 3273481c6f50SPhilipp Reisner drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0)); 327481e84650SAndreas Gruenbacher return false; 3275481c6f50SPhilipp Reisner } 327665d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 3277b411b363SPhilipp Reisner ns = mdev->state; 3278b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3279b411b363SPhilipp Reisner 3280b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 3281b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 328281e84650SAndreas Gruenbacher return false; 3283b411b363SPhilipp Reisner } 3284b411b363SPhilipp Reisner 32854ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 32864ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3287b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3288b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3289b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3290b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3291b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3292b411b363SPhilipp Reisner drbd_send_state(mdev); 3293b411b363SPhilipp Reisner } 3294b411b363SPhilipp Reisner } 3295b411b363SPhilipp Reisner 3296b411b363SPhilipp Reisner mdev->net_conf->want_lose = 0; 3297b411b363SPhilipp Reisner 3298b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3299b411b363SPhilipp Reisner 330081e84650SAndreas Gruenbacher return true; 3301b411b363SPhilipp Reisner } 3302b411b363SPhilipp Reisner 330302918be2SPhilipp Reisner static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3304b411b363SPhilipp Reisner { 330502918be2SPhilipp Reisner struct p_rs_uuid *p = &mdev->data.rbuf.rs_uuid; 3306b411b363SPhilipp Reisner 3307b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3308b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3309c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3310b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3311b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3312b411b363SPhilipp Reisner 3313b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3314b411b363SPhilipp Reisner 3315b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3316b411b363SPhilipp Reisner _not_ be rotated into the history */ 3317b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3318b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3319b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3320b411b363SPhilipp Reisner 332162b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3322b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3323b411b363SPhilipp Reisner 3324b411b363SPhilipp Reisner put_ldev(mdev); 3325b411b363SPhilipp Reisner } else 3326b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3327b411b363SPhilipp Reisner 332881e84650SAndreas Gruenbacher return true; 3329b411b363SPhilipp Reisner } 3330b411b363SPhilipp Reisner 33312c46407dSAndreas Gruenbacher /** 33322c46407dSAndreas Gruenbacher * receive_bitmap_plain 33332c46407dSAndreas Gruenbacher * 33342c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 33352c46407dSAndreas Gruenbacher * code upon failure. 33362c46407dSAndreas Gruenbacher */ 33372c46407dSAndreas Gruenbacher static int 333802918be2SPhilipp Reisner receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size, 3339b411b363SPhilipp Reisner unsigned long *buffer, struct bm_xfer_ctx *c) 3340b411b363SPhilipp Reisner { 3341b411b363SPhilipp Reisner unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); 3342b411b363SPhilipp Reisner unsigned want = num_words * sizeof(long); 33432c46407dSAndreas Gruenbacher int err; 3344b411b363SPhilipp Reisner 334502918be2SPhilipp Reisner if (want != data_size) { 334602918be2SPhilipp Reisner dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size); 33472c46407dSAndreas Gruenbacher return -EIO; 3348b411b363SPhilipp Reisner } 3349b411b363SPhilipp Reisner if (want == 0) 33502c46407dSAndreas Gruenbacher return 0; 33512c46407dSAndreas Gruenbacher err = drbd_recv(mdev, buffer, want); 33522c46407dSAndreas Gruenbacher if (err != want) { 33532c46407dSAndreas Gruenbacher if (err >= 0) 33542c46407dSAndreas Gruenbacher err = -EIO; 33552c46407dSAndreas Gruenbacher return err; 33562c46407dSAndreas Gruenbacher } 3357b411b363SPhilipp Reisner 3358b411b363SPhilipp Reisner drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); 3359b411b363SPhilipp Reisner 3360b411b363SPhilipp Reisner c->word_offset += num_words; 3361b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3362b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3363b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3364b411b363SPhilipp Reisner 33652c46407dSAndreas Gruenbacher return 1; 3366b411b363SPhilipp Reisner } 3367b411b363SPhilipp Reisner 33682c46407dSAndreas Gruenbacher /** 33692c46407dSAndreas Gruenbacher * recv_bm_rle_bits 33702c46407dSAndreas Gruenbacher * 33712c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 33722c46407dSAndreas Gruenbacher * code upon failure. 33732c46407dSAndreas Gruenbacher */ 33742c46407dSAndreas Gruenbacher static int 3375b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3376b411b363SPhilipp Reisner struct p_compressed_bm *p, 3377b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3378b411b363SPhilipp Reisner { 3379b411b363SPhilipp Reisner struct bitstream bs; 3380b411b363SPhilipp Reisner u64 look_ahead; 3381b411b363SPhilipp Reisner u64 rl; 3382b411b363SPhilipp Reisner u64 tmp; 3383b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3384b411b363SPhilipp Reisner unsigned long e; 3385004352faSLars Ellenberg int len = be16_to_cpu(p->head.length) - (sizeof(*p) - sizeof(p->head)); 3386b411b363SPhilipp Reisner int toggle = DCBP_get_start(p); 3387b411b363SPhilipp Reisner int have; 3388b411b363SPhilipp Reisner int bits; 3389b411b363SPhilipp Reisner 3390b411b363SPhilipp Reisner bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); 3391b411b363SPhilipp Reisner 3392b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3393b411b363SPhilipp Reisner if (bits < 0) 33942c46407dSAndreas Gruenbacher return -EIO; 3395b411b363SPhilipp Reisner 3396b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3397b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3398b411b363SPhilipp Reisner if (bits <= 0) 33992c46407dSAndreas Gruenbacher return -EIO; 3400b411b363SPhilipp Reisner 3401b411b363SPhilipp Reisner if (toggle) { 3402b411b363SPhilipp Reisner e = s + rl -1; 3403b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3404b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 34052c46407dSAndreas Gruenbacher return -EIO; 3406b411b363SPhilipp Reisner } 3407b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3408b411b363SPhilipp Reisner } 3409b411b363SPhilipp Reisner 3410b411b363SPhilipp Reisner if (have < bits) { 3411b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3412b411b363SPhilipp Reisner have, bits, look_ahead, 3413b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3414b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 34152c46407dSAndreas Gruenbacher return -EIO; 3416b411b363SPhilipp Reisner } 3417b411b363SPhilipp Reisner look_ahead >>= bits; 3418b411b363SPhilipp Reisner have -= bits; 3419b411b363SPhilipp Reisner 3420b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3421b411b363SPhilipp Reisner if (bits < 0) 34222c46407dSAndreas Gruenbacher return -EIO; 3423b411b363SPhilipp Reisner look_ahead |= tmp << have; 3424b411b363SPhilipp Reisner have += bits; 3425b411b363SPhilipp Reisner } 3426b411b363SPhilipp Reisner 3427b411b363SPhilipp Reisner c->bit_offset = s; 3428b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3429b411b363SPhilipp Reisner 34302c46407dSAndreas Gruenbacher return (s != c->bm_bits); 3431b411b363SPhilipp Reisner } 3432b411b363SPhilipp Reisner 34332c46407dSAndreas Gruenbacher /** 34342c46407dSAndreas Gruenbacher * decode_bitmap_c 34352c46407dSAndreas Gruenbacher * 34362c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 34372c46407dSAndreas Gruenbacher * code upon failure. 34382c46407dSAndreas Gruenbacher */ 34392c46407dSAndreas Gruenbacher static int 3440b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3441b411b363SPhilipp Reisner struct p_compressed_bm *p, 3442b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3443b411b363SPhilipp Reisner { 3444b411b363SPhilipp Reisner if (DCBP_get_code(p) == RLE_VLI_Bits) 3445b411b363SPhilipp Reisner return recv_bm_rle_bits(mdev, p, c); 3446b411b363SPhilipp Reisner 3447b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3448b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3449b411b363SPhilipp Reisner * during all our tests. */ 3450b411b363SPhilipp Reisner 3451b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 3452b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 34532c46407dSAndreas Gruenbacher return -EIO; 3454b411b363SPhilipp Reisner } 3455b411b363SPhilipp Reisner 3456b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3457b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3458b411b363SPhilipp Reisner { 3459b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 34600b70a13dSPhilipp Reisner unsigned plain = sizeof(struct p_header80) * 3461b411b363SPhilipp Reisner ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) 3462b411b363SPhilipp Reisner + c->bm_words * sizeof(long); 3463b411b363SPhilipp Reisner unsigned total = c->bytes[0] + c->bytes[1]; 3464b411b363SPhilipp Reisner unsigned r; 3465b411b363SPhilipp Reisner 3466b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3467b411b363SPhilipp Reisner if (total == 0) 3468b411b363SPhilipp Reisner return; 3469b411b363SPhilipp Reisner 3470b411b363SPhilipp Reisner /* don't report if not compressed */ 3471b411b363SPhilipp Reisner if (total >= plain) 3472b411b363SPhilipp Reisner return; 3473b411b363SPhilipp Reisner 3474b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3475b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3476b411b363SPhilipp Reisner : (1000 * total / plain); 3477b411b363SPhilipp Reisner 3478b411b363SPhilipp Reisner if (r > 1000) 3479b411b363SPhilipp Reisner r = 1000; 3480b411b363SPhilipp Reisner 3481b411b363SPhilipp Reisner r = 1000 - r; 3482b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3483b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3484b411b363SPhilipp Reisner direction, 3485b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3486b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3487b411b363SPhilipp Reisner total, r/10, r % 10); 3488b411b363SPhilipp Reisner } 3489b411b363SPhilipp Reisner 3490b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3491b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3492b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3493b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3494b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3495b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3496b411b363SPhilipp Reisner 3497b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 349802918be2SPhilipp Reisner static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3499b411b363SPhilipp Reisner { 3500b411b363SPhilipp Reisner struct bm_xfer_ctx c; 3501b411b363SPhilipp Reisner void *buffer; 35022c46407dSAndreas Gruenbacher int err; 350381e84650SAndreas Gruenbacher int ok = false; 350402918be2SPhilipp Reisner struct p_header80 *h = &mdev->data.rbuf.header.h80; 3505b411b363SPhilipp Reisner 350620ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 350720ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 350820ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 3509b411b363SPhilipp Reisner 3510b411b363SPhilipp Reisner /* maybe we should use some per thread scratch page, 3511b411b363SPhilipp Reisner * and allocate that during initial device creation? */ 3512b411b363SPhilipp Reisner buffer = (unsigned long *) __get_free_page(GFP_NOIO); 3513b411b363SPhilipp Reisner if (!buffer) { 3514b411b363SPhilipp Reisner dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); 3515b411b363SPhilipp Reisner goto out; 3516b411b363SPhilipp Reisner } 3517b411b363SPhilipp Reisner 3518b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3519b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3520b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3521b411b363SPhilipp Reisner }; 3522b411b363SPhilipp Reisner 35232c46407dSAndreas Gruenbacher for(;;) { 352402918be2SPhilipp Reisner if (cmd == P_BITMAP) { 35252c46407dSAndreas Gruenbacher err = receive_bitmap_plain(mdev, data_size, buffer, &c); 352602918be2SPhilipp Reisner } else if (cmd == P_COMPRESSED_BITMAP) { 3527b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3528b411b363SPhilipp Reisner * and the feature is enabled! */ 3529b411b363SPhilipp Reisner struct p_compressed_bm *p; 3530b411b363SPhilipp Reisner 353102918be2SPhilipp Reisner if (data_size > BM_PACKET_PAYLOAD_BYTES) { 3532b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 3533b411b363SPhilipp Reisner goto out; 3534b411b363SPhilipp Reisner } 3535b411b363SPhilipp Reisner /* use the page buff */ 3536b411b363SPhilipp Reisner p = buffer; 3537b411b363SPhilipp Reisner memcpy(p, h, sizeof(*h)); 353802918be2SPhilipp Reisner if (drbd_recv(mdev, p->head.payload, data_size) != data_size) 3539b411b363SPhilipp Reisner goto out; 3540004352faSLars Ellenberg if (data_size <= (sizeof(*p) - sizeof(p->head))) { 3541004352faSLars Ellenberg dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size); 354278fcbdaeSAndreas Gruenbacher goto out; 3543b411b363SPhilipp Reisner } 35442c46407dSAndreas Gruenbacher err = decode_bitmap_c(mdev, p, &c); 3545b411b363SPhilipp Reisner } else { 354602918be2SPhilipp Reisner dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd); 3547b411b363SPhilipp Reisner goto out; 3548b411b363SPhilipp Reisner } 3549b411b363SPhilipp Reisner 355002918be2SPhilipp Reisner c.packets[cmd == P_BITMAP]++; 355102918be2SPhilipp Reisner c.bytes[cmd == P_BITMAP] += sizeof(struct p_header80) + data_size; 3552b411b363SPhilipp Reisner 35532c46407dSAndreas Gruenbacher if (err <= 0) { 35542c46407dSAndreas Gruenbacher if (err < 0) 35552c46407dSAndreas Gruenbacher goto out; 3556b411b363SPhilipp Reisner break; 35572c46407dSAndreas Gruenbacher } 355802918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &data_size)) 3559b411b363SPhilipp Reisner goto out; 35602c46407dSAndreas Gruenbacher } 3561b411b363SPhilipp Reisner 3562b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 3563b411b363SPhilipp Reisner 3564b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 3565de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 3566de1f8e4aSAndreas Gruenbacher 3567b411b363SPhilipp Reisner ok = !drbd_send_bitmap(mdev); 3568b411b363SPhilipp Reisner if (!ok) 3569b411b363SPhilipp Reisner goto out; 3570b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 3571de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 3572de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 3573b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 3574b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 3575b411b363SPhilipp Reisner * other threads may have noticed network errors */ 3576b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 3577b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3578b411b363SPhilipp Reisner } 3579b411b363SPhilipp Reisner 358081e84650SAndreas Gruenbacher ok = true; 3581b411b363SPhilipp Reisner out: 358220ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 3583b411b363SPhilipp Reisner if (ok && mdev->state.conn == C_WF_BITMAP_S) 3584b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 3585b411b363SPhilipp Reisner free_page((unsigned long) buffer); 3586b411b363SPhilipp Reisner return ok; 3587b411b363SPhilipp Reisner } 3588b411b363SPhilipp Reisner 358902918be2SPhilipp Reisner static int receive_skip(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3590b411b363SPhilipp Reisner { 3591b411b363SPhilipp Reisner /* TODO zero copy sink :) */ 3592b411b363SPhilipp Reisner static char sink[128]; 3593b411b363SPhilipp Reisner int size, want, r; 3594b411b363SPhilipp Reisner 3595b411b363SPhilipp Reisner dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", 359602918be2SPhilipp Reisner cmd, data_size); 3597b411b363SPhilipp Reisner 359802918be2SPhilipp Reisner size = data_size; 3599b411b363SPhilipp Reisner while (size > 0) { 3600b411b363SPhilipp Reisner want = min_t(int, size, sizeof(sink)); 3601b411b363SPhilipp Reisner r = drbd_recv(mdev, sink, want); 3602b411b363SPhilipp Reisner ERR_IF(r <= 0) break; 3603b411b363SPhilipp Reisner size -= r; 3604b411b363SPhilipp Reisner } 3605b411b363SPhilipp Reisner return size == 0; 3606b411b363SPhilipp Reisner } 3607b411b363SPhilipp Reisner 360802918be2SPhilipp Reisner static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3609b411b363SPhilipp Reisner { 3610b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 3611b411b363SPhilipp Reisner * with the data requests being unplugged */ 3612b411b363SPhilipp Reisner drbd_tcp_quickack(mdev->data.socket); 3613b411b363SPhilipp Reisner 361481e84650SAndreas Gruenbacher return true; 3615b411b363SPhilipp Reisner } 3616b411b363SPhilipp Reisner 361773a01a18SPhilipp Reisner static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 361873a01a18SPhilipp Reisner { 361973a01a18SPhilipp Reisner struct p_block_desc *p = &mdev->data.rbuf.block_desc; 362073a01a18SPhilipp Reisner 3621f735e363SLars Ellenberg switch (mdev->state.conn) { 3622f735e363SLars Ellenberg case C_WF_SYNC_UUID: 3623f735e363SLars Ellenberg case C_WF_BITMAP_T: 3624f735e363SLars Ellenberg case C_BEHIND: 3625f735e363SLars Ellenberg break; 3626f735e363SLars Ellenberg default: 3627f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 3628f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 3629f735e363SLars Ellenberg } 3630f735e363SLars Ellenberg 363173a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 363273a01a18SPhilipp Reisner 363381e84650SAndreas Gruenbacher return true; 363473a01a18SPhilipp Reisner } 363573a01a18SPhilipp Reisner 363602918be2SPhilipp Reisner typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, enum drbd_packets cmd, unsigned int to_receive); 3637b411b363SPhilipp Reisner 363802918be2SPhilipp Reisner struct data_cmd { 363902918be2SPhilipp Reisner int expect_payload; 364002918be2SPhilipp Reisner size_t pkt_size; 364102918be2SPhilipp Reisner drbd_cmd_handler_f function; 3642b411b363SPhilipp Reisner }; 3643b411b363SPhilipp Reisner 364402918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 364502918be2SPhilipp Reisner [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 364602918be2SPhilipp Reisner [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 364702918be2SPhilipp Reisner [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 364802918be2SPhilipp Reisner [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 364902918be2SPhilipp Reisner [P_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } , 365002918be2SPhilipp Reisner [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } , 365102918be2SPhilipp Reisner [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header80), receive_UnplugRemote }, 365202918be2SPhilipp Reisner [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 365302918be2SPhilipp Reisner [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 365402918be2SPhilipp Reisner [P_SYNC_PARAM] = { 1, sizeof(struct p_header80), receive_SyncParam }, 365502918be2SPhilipp Reisner [P_SYNC_PARAM89] = { 1, sizeof(struct p_header80), receive_SyncParam }, 365602918be2SPhilipp Reisner [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 365702918be2SPhilipp Reisner [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 365802918be2SPhilipp Reisner [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 365902918be2SPhilipp Reisner [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 366002918be2SPhilipp Reisner [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 366102918be2SPhilipp Reisner [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 366202918be2SPhilipp Reisner [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 366302918be2SPhilipp Reisner [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 366402918be2SPhilipp Reisner [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 366502918be2SPhilipp Reisner [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 366673a01a18SPhilipp Reisner [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 366702918be2SPhilipp Reisner /* anything missing from this table is in 366802918be2SPhilipp Reisner * the asender_tbl, see get_asender_cmd */ 366902918be2SPhilipp Reisner [P_MAX_CMD] = { 0, 0, NULL }, 367002918be2SPhilipp Reisner }; 367102918be2SPhilipp Reisner 367202918be2SPhilipp Reisner /* All handler functions that expect a sub-header get that sub-heder in 367302918be2SPhilipp Reisner mdev->data.rbuf.header.head.payload. 367402918be2SPhilipp Reisner 367502918be2SPhilipp Reisner Usually in mdev->data.rbuf.header.head the callback can find the usual 367602918be2SPhilipp Reisner p_header, but they may not rely on that. Since there is also p_header95 ! 367702918be2SPhilipp Reisner */ 3678b411b363SPhilipp Reisner 3679b411b363SPhilipp Reisner static void drbdd(struct drbd_conf *mdev) 3680b411b363SPhilipp Reisner { 368102918be2SPhilipp Reisner union p_header *header = &mdev->data.rbuf.header; 368202918be2SPhilipp Reisner unsigned int packet_size; 368302918be2SPhilipp Reisner enum drbd_packets cmd; 368402918be2SPhilipp Reisner size_t shs; /* sub header size */ 368502918be2SPhilipp Reisner int rv; 3686b411b363SPhilipp Reisner 3687b411b363SPhilipp Reisner while (get_t_state(&mdev->receiver) == Running) { 3688b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 368902918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &packet_size)) 369002918be2SPhilipp Reisner goto err_out; 369102918be2SPhilipp Reisner 369202918be2SPhilipp Reisner if (unlikely(cmd >= P_MAX_CMD || !drbd_cmd_handler[cmd].function)) { 369302918be2SPhilipp Reisner dev_err(DEV, "unknown packet type %d, l: %d!\n", cmd, packet_size); 369402918be2SPhilipp Reisner goto err_out; 36950b33a916SLars Ellenberg } 3696b411b363SPhilipp Reisner 369702918be2SPhilipp Reisner shs = drbd_cmd_handler[cmd].pkt_size - sizeof(union p_header); 3698c13f7e1aSLars Ellenberg if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) { 3699c13f7e1aSLars Ellenberg dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size); 3700c13f7e1aSLars Ellenberg goto err_out; 3701c13f7e1aSLars Ellenberg } 3702c13f7e1aSLars Ellenberg 3703c13f7e1aSLars Ellenberg if (shs) { 370402918be2SPhilipp Reisner rv = drbd_recv(mdev, &header->h80.payload, shs); 370502918be2SPhilipp Reisner if (unlikely(rv != shs)) { 37060ddc5549SLars Ellenberg if (!signal_pending(current)) 37070ddc5549SLars Ellenberg dev_warn(DEV, "short read while reading sub header: rv=%d\n", rv); 370802918be2SPhilipp Reisner goto err_out; 3709b411b363SPhilipp Reisner } 371002918be2SPhilipp Reisner } 371102918be2SPhilipp Reisner 371202918be2SPhilipp Reisner rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs); 371302918be2SPhilipp Reisner 371402918be2SPhilipp Reisner if (unlikely(!rv)) { 3715b411b363SPhilipp Reisner dev_err(DEV, "error receiving %s, l: %d!\n", 371602918be2SPhilipp Reisner cmdname(cmd), packet_size); 371702918be2SPhilipp Reisner goto err_out; 3718b411b363SPhilipp Reisner } 3719b411b363SPhilipp Reisner } 372002918be2SPhilipp Reisner 372102918be2SPhilipp Reisner if (0) { 372202918be2SPhilipp Reisner err_out: 3723b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3724b411b363SPhilipp Reisner } 3725856c50c7SLars Ellenberg /* If we leave here, we probably want to update at least the 3726856c50c7SLars Ellenberg * "Connected" indicator on stable storage. Do so explicitly here. */ 3727856c50c7SLars Ellenberg drbd_md_sync(mdev); 3728b411b363SPhilipp Reisner } 3729b411b363SPhilipp Reisner 3730b411b363SPhilipp Reisner void drbd_flush_workqueue(struct drbd_conf *mdev) 3731b411b363SPhilipp Reisner { 3732b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 3733b411b363SPhilipp Reisner 3734b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 3735b411b363SPhilipp Reisner init_completion(&barr.done); 3736b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, &barr.w); 3737b411b363SPhilipp Reisner wait_for_completion(&barr.done); 3738b411b363SPhilipp Reisner } 3739b411b363SPhilipp Reisner 3740f70b3511SPhilipp Reisner void drbd_free_tl_hash(struct drbd_conf *mdev) 3741f70b3511SPhilipp Reisner { 3742f70b3511SPhilipp Reisner struct hlist_head *h; 3743f70b3511SPhilipp Reisner 3744f70b3511SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3745f70b3511SPhilipp Reisner 3746f70b3511SPhilipp Reisner if (!mdev->tl_hash || mdev->state.conn != C_STANDALONE) { 3747f70b3511SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3748f70b3511SPhilipp Reisner return; 3749f70b3511SPhilipp Reisner } 3750f70b3511SPhilipp Reisner /* paranoia code */ 3751f70b3511SPhilipp Reisner for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++) 3752f70b3511SPhilipp Reisner if (h->first) 3753f70b3511SPhilipp Reisner dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n", 3754f70b3511SPhilipp Reisner (int)(h - mdev->ee_hash), h->first); 3755f70b3511SPhilipp Reisner kfree(mdev->ee_hash); 3756f70b3511SPhilipp Reisner mdev->ee_hash = NULL; 3757f70b3511SPhilipp Reisner mdev->ee_hash_s = 0; 3758f70b3511SPhilipp Reisner 3759f70b3511SPhilipp Reisner /* paranoia code */ 3760f70b3511SPhilipp Reisner for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++) 3761f70b3511SPhilipp Reisner if (h->first) 3762f70b3511SPhilipp Reisner dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n", 3763f70b3511SPhilipp Reisner (int)(h - mdev->tl_hash), h->first); 3764f70b3511SPhilipp Reisner kfree(mdev->tl_hash); 3765f70b3511SPhilipp Reisner mdev->tl_hash = NULL; 3766f70b3511SPhilipp Reisner mdev->tl_hash_s = 0; 3767f70b3511SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3768f70b3511SPhilipp Reisner } 3769f70b3511SPhilipp Reisner 3770b411b363SPhilipp Reisner static void drbd_disconnect(struct drbd_conf *mdev) 3771b411b363SPhilipp Reisner { 3772b411b363SPhilipp Reisner enum drbd_fencing_p fp; 3773b411b363SPhilipp Reisner union drbd_state os, ns; 3774b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 3775b411b363SPhilipp Reisner unsigned int i; 3776b411b363SPhilipp Reisner 3777b411b363SPhilipp Reisner if (mdev->state.conn == C_STANDALONE) 3778b411b363SPhilipp Reisner return; 3779b411b363SPhilipp Reisner 3780b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 3781b411b363SPhilipp Reisner drbd_thread_stop(&mdev->asender); 3782b411b363SPhilipp Reisner drbd_free_sock(mdev); 3783b411b363SPhilipp Reisner 378485719573SPhilipp Reisner /* wait for current activity to cease. */ 3785b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3786b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 3787b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 3788b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 3789b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3790b411b363SPhilipp Reisner 3791b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 3792b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 3793b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 3794b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 3795b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 3796b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 3797b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 3798b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 3799b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 3800b411b363SPhilipp Reisner * on the fly. */ 3801b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 3802b411b363SPhilipp Reisner mdev->rs_total = 0; 3803b411b363SPhilipp Reisner mdev->rs_failed = 0; 3804b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 3805b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 3806b411b363SPhilipp Reisner 3807b411b363SPhilipp Reisner /* make sure syncer is stopped and w_resume_next_sg queued */ 3808b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 3809b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 3810b411b363SPhilipp Reisner 3811b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 3812b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 3813b411b363SPhilipp Reisner * to be "canceled" */ 3814b411b363SPhilipp Reisner drbd_flush_workqueue(mdev); 3815b411b363SPhilipp Reisner 3816b411b363SPhilipp Reisner /* This also does reclaim_net_ee(). If we do this too early, we might 3817b411b363SPhilipp Reisner * miss some resync ee and pages.*/ 3818b411b363SPhilipp Reisner drbd_process_done_ee(mdev); 3819b411b363SPhilipp Reisner 3820b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3821b411b363SPhilipp Reisner mdev->p_uuid = NULL; 3822b411b363SPhilipp Reisner 3823fb22c402SPhilipp Reisner if (!is_susp(mdev->state)) 3824b411b363SPhilipp Reisner tl_clear(mdev); 3825b411b363SPhilipp Reisner 3826b411b363SPhilipp Reisner dev_info(DEV, "Connection closed\n"); 3827b411b363SPhilipp Reisner 3828b411b363SPhilipp Reisner drbd_md_sync(mdev); 3829b411b363SPhilipp Reisner 3830b411b363SPhilipp Reisner fp = FP_DONT_CARE; 3831b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3832b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 3833b411b363SPhilipp Reisner put_ldev(mdev); 3834b411b363SPhilipp Reisner } 3835b411b363SPhilipp Reisner 383687f7be4cSPhilipp Reisner if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) 383787f7be4cSPhilipp Reisner drbd_try_outdate_peer_async(mdev); 3838b411b363SPhilipp Reisner 3839b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3840b411b363SPhilipp Reisner os = mdev->state; 3841b411b363SPhilipp Reisner if (os.conn >= C_UNCONNECTED) { 3842b411b363SPhilipp Reisner /* Do not restart in case we are C_DISCONNECTING */ 3843b411b363SPhilipp Reisner ns = os; 3844b411b363SPhilipp Reisner ns.conn = C_UNCONNECTED; 3845b411b363SPhilipp Reisner rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 3846b411b363SPhilipp Reisner } 3847b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3848b411b363SPhilipp Reisner 3849b411b363SPhilipp Reisner if (os.conn == C_DISCONNECTING) { 385084dfb9f5SPhilipp Reisner wait_event(mdev->net_cnt_wait, atomic_read(&mdev->net_cnt) == 0); 3851b411b363SPhilipp Reisner 3852b411b363SPhilipp Reisner crypto_free_hash(mdev->cram_hmac_tfm); 3853b411b363SPhilipp Reisner mdev->cram_hmac_tfm = NULL; 3854b411b363SPhilipp Reisner 3855b411b363SPhilipp Reisner kfree(mdev->net_conf); 3856b411b363SPhilipp Reisner mdev->net_conf = NULL; 3857b411b363SPhilipp Reisner drbd_request_state(mdev, NS(conn, C_STANDALONE)); 3858b411b363SPhilipp Reisner } 3859b411b363SPhilipp Reisner 386020ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 386120ceb2b2SLars Ellenberg * if any. */ 386220ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 386320ceb2b2SLars Ellenberg 3864b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 3865b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 3866b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 3867b411b363SPhilipp Reisner * 3868b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 3869b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 3870b411b363SPhilipp Reisner */ 3871b411b363SPhilipp Reisner i = drbd_release_ee(mdev, &mdev->net_ee); 3872b411b363SPhilipp Reisner if (i) 3873b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 3874435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 3875435f0740SLars Ellenberg if (i) 3876435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 3877b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 3878b411b363SPhilipp Reisner if (i) 387945bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 3880b411b363SPhilipp Reisner 3881b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 3882b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 3883b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 3884b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 3885b411b363SPhilipp Reisner 3886b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 3887b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 3888b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 3889b411b363SPhilipp Reisner } 3890b411b363SPhilipp Reisner 3891b411b363SPhilipp Reisner /* 3892b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 3893b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 3894b411b363SPhilipp Reisner * 3895b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 3896b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 3897b411b363SPhilipp Reisner * 3898b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 3899b411b363SPhilipp Reisner */ 3900b411b363SPhilipp Reisner static int drbd_send_handshake(struct drbd_conf *mdev) 3901b411b363SPhilipp Reisner { 3902b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3903b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.sbuf.handshake; 3904b411b363SPhilipp Reisner int ok; 3905b411b363SPhilipp Reisner 3906b411b363SPhilipp Reisner if (mutex_lock_interruptible(&mdev->data.mutex)) { 3907b411b363SPhilipp Reisner dev_err(DEV, "interrupted during initial handshake\n"); 3908b411b363SPhilipp Reisner return 0; /* interrupted. not ok. */ 3909b411b363SPhilipp Reisner } 3910b411b363SPhilipp Reisner 3911b411b363SPhilipp Reisner if (mdev->data.socket == NULL) { 3912b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3913b411b363SPhilipp Reisner return 0; 3914b411b363SPhilipp Reisner } 3915b411b363SPhilipp Reisner 3916b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 3917b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 3918b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 3919b411b363SPhilipp Reisner ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE, 39200b70a13dSPhilipp Reisner (struct p_header80 *)p, sizeof(*p), 0 ); 3921b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3922b411b363SPhilipp Reisner return ok; 3923b411b363SPhilipp Reisner } 3924b411b363SPhilipp Reisner 3925b411b363SPhilipp Reisner /* 3926b411b363SPhilipp Reisner * return values: 3927b411b363SPhilipp Reisner * 1 yes, we have a valid connection 3928b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 3929b411b363SPhilipp Reisner * -1 peer talks different language, 3930b411b363SPhilipp Reisner * no point in trying again, please go standalone. 3931b411b363SPhilipp Reisner */ 3932b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev) 3933b411b363SPhilipp Reisner { 3934b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3935b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.rbuf.handshake; 393602918be2SPhilipp Reisner const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80); 393702918be2SPhilipp Reisner unsigned int length; 393802918be2SPhilipp Reisner enum drbd_packets cmd; 3939b411b363SPhilipp Reisner int rv; 3940b411b363SPhilipp Reisner 3941b411b363SPhilipp Reisner rv = drbd_send_handshake(mdev); 3942b411b363SPhilipp Reisner if (!rv) 3943b411b363SPhilipp Reisner return 0; 3944b411b363SPhilipp Reisner 394502918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 3946b411b363SPhilipp Reisner if (!rv) 3947b411b363SPhilipp Reisner return 0; 3948b411b363SPhilipp Reisner 394902918be2SPhilipp Reisner if (cmd != P_HAND_SHAKE) { 3950b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", 395102918be2SPhilipp Reisner cmdname(cmd), cmd); 3952b411b363SPhilipp Reisner return -1; 3953b411b363SPhilipp Reisner } 3954b411b363SPhilipp Reisner 395502918be2SPhilipp Reisner if (length != expect) { 3956b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake length: %u, received: %u\n", 395702918be2SPhilipp Reisner expect, length); 3958b411b363SPhilipp Reisner return -1; 3959b411b363SPhilipp Reisner } 3960b411b363SPhilipp Reisner 3961b411b363SPhilipp Reisner rv = drbd_recv(mdev, &p->head.payload, expect); 3962b411b363SPhilipp Reisner 3963b411b363SPhilipp Reisner if (rv != expect) { 39640ddc5549SLars Ellenberg if (!signal_pending(current)) 39650ddc5549SLars Ellenberg dev_warn(DEV, "short read receiving handshake packet: l=%u\n", rv); 3966b411b363SPhilipp Reisner return 0; 3967b411b363SPhilipp Reisner } 3968b411b363SPhilipp Reisner 3969b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 3970b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 3971b411b363SPhilipp Reisner if (p->protocol_max == 0) 3972b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 3973b411b363SPhilipp Reisner 3974b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 3975b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 3976b411b363SPhilipp Reisner goto incompat; 3977b411b363SPhilipp Reisner 3978b411b363SPhilipp Reisner mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 3979b411b363SPhilipp Reisner 3980b411b363SPhilipp Reisner dev_info(DEV, "Handshake successful: " 3981b411b363SPhilipp Reisner "Agreed network protocol version %d\n", mdev->agreed_pro_version); 3982b411b363SPhilipp Reisner 3983b411b363SPhilipp Reisner return 1; 3984b411b363SPhilipp Reisner 3985b411b363SPhilipp Reisner incompat: 3986b411b363SPhilipp Reisner dev_err(DEV, "incompatible DRBD dialects: " 3987b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 3988b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 3989b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 3990b411b363SPhilipp Reisner return -1; 3991b411b363SPhilipp Reisner } 3992b411b363SPhilipp Reisner 3993b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 3994b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 3995b411b363SPhilipp Reisner { 3996b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 3997b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 3998b10d96cbSJohannes Thoma return -1; 3999b411b363SPhilipp Reisner } 4000b411b363SPhilipp Reisner #else 4001b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4002b10d96cbSJohannes Thoma 4003b10d96cbSJohannes Thoma /* Return value: 4004b10d96cbSJohannes Thoma 1 - auth succeeded, 4005b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4006b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4007b10d96cbSJohannes Thoma */ 4008b10d96cbSJohannes Thoma 4009b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 4010b411b363SPhilipp Reisner { 4011b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4012b411b363SPhilipp Reisner struct scatterlist sg; 4013b411b363SPhilipp Reisner char *response = NULL; 4014b411b363SPhilipp Reisner char *right_response = NULL; 4015b411b363SPhilipp Reisner char *peers_ch = NULL; 4016b411b363SPhilipp Reisner unsigned int key_len = strlen(mdev->net_conf->shared_secret); 4017b411b363SPhilipp Reisner unsigned int resp_size; 4018b411b363SPhilipp Reisner struct hash_desc desc; 401902918be2SPhilipp Reisner enum drbd_packets cmd; 402002918be2SPhilipp Reisner unsigned int length; 4021b411b363SPhilipp Reisner int rv; 4022b411b363SPhilipp Reisner 4023b411b363SPhilipp Reisner desc.tfm = mdev->cram_hmac_tfm; 4024b411b363SPhilipp Reisner desc.flags = 0; 4025b411b363SPhilipp Reisner 4026b411b363SPhilipp Reisner rv = crypto_hash_setkey(mdev->cram_hmac_tfm, 4027b411b363SPhilipp Reisner (u8 *)mdev->net_conf->shared_secret, key_len); 4028b411b363SPhilipp Reisner if (rv) { 4029b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); 4030b10d96cbSJohannes Thoma rv = -1; 4031b411b363SPhilipp Reisner goto fail; 4032b411b363SPhilipp Reisner } 4033b411b363SPhilipp Reisner 4034b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4035b411b363SPhilipp Reisner 4036b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); 4037b411b363SPhilipp Reisner if (!rv) 4038b411b363SPhilipp Reisner goto fail; 4039b411b363SPhilipp Reisner 404002918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4041b411b363SPhilipp Reisner if (!rv) 4042b411b363SPhilipp Reisner goto fail; 4043b411b363SPhilipp Reisner 404402918be2SPhilipp Reisner if (cmd != P_AUTH_CHALLENGE) { 4045b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", 404602918be2SPhilipp Reisner cmdname(cmd), cmd); 4047b411b363SPhilipp Reisner rv = 0; 4048b411b363SPhilipp Reisner goto fail; 4049b411b363SPhilipp Reisner } 4050b411b363SPhilipp Reisner 405102918be2SPhilipp Reisner if (length > CHALLENGE_LEN * 2) { 4052b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge payload too big.\n"); 4053b10d96cbSJohannes Thoma rv = -1; 4054b411b363SPhilipp Reisner goto fail; 4055b411b363SPhilipp Reisner } 4056b411b363SPhilipp Reisner 405702918be2SPhilipp Reisner peers_ch = kmalloc(length, GFP_NOIO); 4058b411b363SPhilipp Reisner if (peers_ch == NULL) { 4059b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of peers_ch failed\n"); 4060b10d96cbSJohannes Thoma rv = -1; 4061b411b363SPhilipp Reisner goto fail; 4062b411b363SPhilipp Reisner } 4063b411b363SPhilipp Reisner 406402918be2SPhilipp Reisner rv = drbd_recv(mdev, peers_ch, length); 4065b411b363SPhilipp Reisner 406602918be2SPhilipp Reisner if (rv != length) { 40670ddc5549SLars Ellenberg if (!signal_pending(current)) 40680ddc5549SLars Ellenberg dev_warn(DEV, "short read AuthChallenge: l=%u\n", rv); 4069b411b363SPhilipp Reisner rv = 0; 4070b411b363SPhilipp Reisner goto fail; 4071b411b363SPhilipp Reisner } 4072b411b363SPhilipp Reisner 4073b411b363SPhilipp Reisner resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm); 4074b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4075b411b363SPhilipp Reisner if (response == NULL) { 4076b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of response failed\n"); 4077b10d96cbSJohannes Thoma rv = -1; 4078b411b363SPhilipp Reisner goto fail; 4079b411b363SPhilipp Reisner } 4080b411b363SPhilipp Reisner 4081b411b363SPhilipp Reisner sg_init_table(&sg, 1); 408202918be2SPhilipp Reisner sg_set_buf(&sg, peers_ch, length); 4083b411b363SPhilipp Reisner 4084b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4085b411b363SPhilipp Reisner if (rv) { 4086b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4087b10d96cbSJohannes Thoma rv = -1; 4088b411b363SPhilipp Reisner goto fail; 4089b411b363SPhilipp Reisner } 4090b411b363SPhilipp Reisner 4091b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); 4092b411b363SPhilipp Reisner if (!rv) 4093b411b363SPhilipp Reisner goto fail; 4094b411b363SPhilipp Reisner 409502918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4096b411b363SPhilipp Reisner if (!rv) 4097b411b363SPhilipp Reisner goto fail; 4098b411b363SPhilipp Reisner 409902918be2SPhilipp Reisner if (cmd != P_AUTH_RESPONSE) { 4100b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", 410102918be2SPhilipp Reisner cmdname(cmd), cmd); 4102b411b363SPhilipp Reisner rv = 0; 4103b411b363SPhilipp Reisner goto fail; 4104b411b363SPhilipp Reisner } 4105b411b363SPhilipp Reisner 410602918be2SPhilipp Reisner if (length != resp_size) { 4107b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse payload of wrong size\n"); 4108b411b363SPhilipp Reisner rv = 0; 4109b411b363SPhilipp Reisner goto fail; 4110b411b363SPhilipp Reisner } 4111b411b363SPhilipp Reisner 4112b411b363SPhilipp Reisner rv = drbd_recv(mdev, response , resp_size); 4113b411b363SPhilipp Reisner 4114b411b363SPhilipp Reisner if (rv != resp_size) { 41150ddc5549SLars Ellenberg if (!signal_pending(current)) 41160ddc5549SLars Ellenberg dev_warn(DEV, "short read receiving AuthResponse: l=%u\n", rv); 4117b411b363SPhilipp Reisner rv = 0; 4118b411b363SPhilipp Reisner goto fail; 4119b411b363SPhilipp Reisner } 4120b411b363SPhilipp Reisner 4121b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 41222d1ee87dSJulia Lawall if (right_response == NULL) { 4123b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of right_response failed\n"); 4124b10d96cbSJohannes Thoma rv = -1; 4125b411b363SPhilipp Reisner goto fail; 4126b411b363SPhilipp Reisner } 4127b411b363SPhilipp Reisner 4128b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4129b411b363SPhilipp Reisner 4130b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4131b411b363SPhilipp Reisner if (rv) { 4132b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4133b10d96cbSJohannes Thoma rv = -1; 4134b411b363SPhilipp Reisner goto fail; 4135b411b363SPhilipp Reisner } 4136b411b363SPhilipp Reisner 4137b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4138b411b363SPhilipp Reisner 4139b411b363SPhilipp Reisner if (rv) 4140b411b363SPhilipp Reisner dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", 4141b411b363SPhilipp Reisner resp_size, mdev->net_conf->cram_hmac_alg); 4142b10d96cbSJohannes Thoma else 4143b10d96cbSJohannes Thoma rv = -1; 4144b411b363SPhilipp Reisner 4145b411b363SPhilipp Reisner fail: 4146b411b363SPhilipp Reisner kfree(peers_ch); 4147b411b363SPhilipp Reisner kfree(response); 4148b411b363SPhilipp Reisner kfree(right_response); 4149b411b363SPhilipp Reisner 4150b411b363SPhilipp Reisner return rv; 4151b411b363SPhilipp Reisner } 4152b411b363SPhilipp Reisner #endif 4153b411b363SPhilipp Reisner 4154b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4155b411b363SPhilipp Reisner { 4156b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 4157b411b363SPhilipp Reisner unsigned int minor = mdev_to_minor(mdev); 4158b411b363SPhilipp Reisner int h; 4159b411b363SPhilipp Reisner 4160b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_receiver", minor); 4161b411b363SPhilipp Reisner 4162b411b363SPhilipp Reisner dev_info(DEV, "receiver (re)started\n"); 4163b411b363SPhilipp Reisner 4164b411b363SPhilipp Reisner do { 4165b411b363SPhilipp Reisner h = drbd_connect(mdev); 4166b411b363SPhilipp Reisner if (h == 0) { 4167b411b363SPhilipp Reisner drbd_disconnect(mdev); 416820ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4169b411b363SPhilipp Reisner } 4170b411b363SPhilipp Reisner if (h == -1) { 4171b411b363SPhilipp Reisner dev_warn(DEV, "Discarding network configuration.\n"); 4172b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4173b411b363SPhilipp Reisner } 4174b411b363SPhilipp Reisner } while (h == 0); 4175b411b363SPhilipp Reisner 4176b411b363SPhilipp Reisner if (h > 0) { 4177b411b363SPhilipp Reisner if (get_net_conf(mdev)) { 4178b411b363SPhilipp Reisner drbdd(mdev); 4179b411b363SPhilipp Reisner put_net_conf(mdev); 4180b411b363SPhilipp Reisner } 4181b411b363SPhilipp Reisner } 4182b411b363SPhilipp Reisner 4183b411b363SPhilipp Reisner drbd_disconnect(mdev); 4184b411b363SPhilipp Reisner 4185b411b363SPhilipp Reisner dev_info(DEV, "receiver terminated\n"); 4186b411b363SPhilipp Reisner return 0; 4187b411b363SPhilipp Reisner } 4188b411b363SPhilipp Reisner 4189b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4190b411b363SPhilipp Reisner 41910b70a13dSPhilipp Reisner static int got_RqSReply(struct drbd_conf *mdev, struct p_header80 *h) 4192b411b363SPhilipp Reisner { 4193b411b363SPhilipp Reisner struct p_req_state_reply *p = (struct p_req_state_reply *)h; 4194b411b363SPhilipp Reisner 4195b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4196b411b363SPhilipp Reisner 4197b411b363SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4198b411b363SPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4199b411b363SPhilipp Reisner } else { 4200b411b363SPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4201b411b363SPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4202b411b363SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4203b411b363SPhilipp Reisner } 4204b411b363SPhilipp Reisner wake_up(&mdev->state_wait); 4205b411b363SPhilipp Reisner 420681e84650SAndreas Gruenbacher return true; 4207b411b363SPhilipp Reisner } 4208b411b363SPhilipp Reisner 42090b70a13dSPhilipp Reisner static int got_Ping(struct drbd_conf *mdev, struct p_header80 *h) 4210b411b363SPhilipp Reisner { 4211b411b363SPhilipp Reisner return drbd_send_ping_ack(mdev); 4212b411b363SPhilipp Reisner 4213b411b363SPhilipp Reisner } 4214b411b363SPhilipp Reisner 42150b70a13dSPhilipp Reisner static int got_PingAck(struct drbd_conf *mdev, struct p_header80 *h) 4216b411b363SPhilipp Reisner { 4217b411b363SPhilipp Reisner /* restore idle timeout */ 4218b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 4219309d1608SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags)) 4220309d1608SPhilipp Reisner wake_up(&mdev->misc_wait); 4221b411b363SPhilipp Reisner 422281e84650SAndreas Gruenbacher return true; 4223b411b363SPhilipp Reisner } 4224b411b363SPhilipp Reisner 42250b70a13dSPhilipp Reisner static int got_IsInSync(struct drbd_conf *mdev, struct p_header80 *h) 4226b411b363SPhilipp Reisner { 4227b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4228b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4229b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4230b411b363SPhilipp Reisner 4231b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 4232b411b363SPhilipp Reisner 4233b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4234b411b363SPhilipp Reisner 42351d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4236b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4237b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4238b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4239b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 42401d53f09eSLars Ellenberg put_ldev(mdev); 42411d53f09eSLars Ellenberg } 4242b411b363SPhilipp Reisner dec_rs_pending(mdev); 4243778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4244b411b363SPhilipp Reisner 424581e84650SAndreas Gruenbacher return true; 4246b411b363SPhilipp Reisner } 4247b411b363SPhilipp Reisner 4248b411b363SPhilipp Reisner /* when we receive the ACK for a write request, 4249b411b363SPhilipp Reisner * verify that we actually know about it */ 4250b411b363SPhilipp Reisner static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev, 4251b411b363SPhilipp Reisner u64 id, sector_t sector) 4252b411b363SPhilipp Reisner { 4253b411b363SPhilipp Reisner struct hlist_head *slot = tl_hash_slot(mdev, sector); 4254b411b363SPhilipp Reisner struct hlist_node *n; 4255b411b363SPhilipp Reisner struct drbd_request *req; 4256b411b363SPhilipp Reisner 425724c4830cSBart Van Assche hlist_for_each_entry(req, n, slot, collision) { 4258b411b363SPhilipp Reisner if ((unsigned long)req == (unsigned long)id) { 4259b411b363SPhilipp Reisner if (req->sector != sector) { 4260b411b363SPhilipp Reisner dev_err(DEV, "_ack_id_to_req: found req %p but it has " 4261b411b363SPhilipp Reisner "wrong sector (%llus versus %llus)\n", req, 4262b411b363SPhilipp Reisner (unsigned long long)req->sector, 4263b411b363SPhilipp Reisner (unsigned long long)sector); 4264b411b363SPhilipp Reisner break; 4265b411b363SPhilipp Reisner } 4266b411b363SPhilipp Reisner return req; 4267b411b363SPhilipp Reisner } 4268b411b363SPhilipp Reisner } 4269b411b363SPhilipp Reisner return NULL; 4270b411b363SPhilipp Reisner } 4271b411b363SPhilipp Reisner 4272b411b363SPhilipp Reisner typedef struct drbd_request *(req_validator_fn) 4273b411b363SPhilipp Reisner (struct drbd_conf *mdev, u64 id, sector_t sector); 4274b411b363SPhilipp Reisner 4275b411b363SPhilipp Reisner static int validate_req_change_req_state(struct drbd_conf *mdev, 4276b411b363SPhilipp Reisner u64 id, sector_t sector, req_validator_fn validator, 4277b411b363SPhilipp Reisner const char *func, enum drbd_req_event what) 4278b411b363SPhilipp Reisner { 4279b411b363SPhilipp Reisner struct drbd_request *req; 4280b411b363SPhilipp Reisner struct bio_and_error m; 4281b411b363SPhilipp Reisner 4282b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4283b411b363SPhilipp Reisner req = validator(mdev, id, sector); 4284b411b363SPhilipp Reisner if (unlikely(!req)) { 4285b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 42862deb8336SPhilipp Reisner 42872deb8336SPhilipp Reisner dev_err(DEV, "%s: failed to find req %p, sector %llus\n", func, 42882deb8336SPhilipp Reisner (void *)(unsigned long)id, (unsigned long long)sector); 428981e84650SAndreas Gruenbacher return false; 4290b411b363SPhilipp Reisner } 4291b411b363SPhilipp Reisner __req_mod(req, what, &m); 4292b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4293b411b363SPhilipp Reisner 4294b411b363SPhilipp Reisner if (m.bio) 4295b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 429681e84650SAndreas Gruenbacher return true; 4297b411b363SPhilipp Reisner } 4298b411b363SPhilipp Reisner 42990b70a13dSPhilipp Reisner static int got_BlockAck(struct drbd_conf *mdev, struct p_header80 *h) 4300b411b363SPhilipp Reisner { 4301b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4302b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4303b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4304b411b363SPhilipp Reisner enum drbd_req_event what; 4305b411b363SPhilipp Reisner 4306b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4307b411b363SPhilipp Reisner 4308b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4309b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4310b411b363SPhilipp Reisner dec_rs_pending(mdev); 431181e84650SAndreas Gruenbacher return true; 4312b411b363SPhilipp Reisner } 4313b411b363SPhilipp Reisner switch (be16_to_cpu(h->command)) { 4314b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 4315b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4316b411b363SPhilipp Reisner what = write_acked_by_peer_and_sis; 4317b411b363SPhilipp Reisner break; 4318b411b363SPhilipp Reisner case P_WRITE_ACK: 4319b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4320b411b363SPhilipp Reisner what = write_acked_by_peer; 4321b411b363SPhilipp Reisner break; 4322b411b363SPhilipp Reisner case P_RECV_ACK: 4323b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B); 4324b411b363SPhilipp Reisner what = recv_acked_by_peer; 4325b411b363SPhilipp Reisner break; 4326b411b363SPhilipp Reisner case P_DISCARD_ACK: 4327b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4328b411b363SPhilipp Reisner what = conflict_discarded_by_peer; 4329b411b363SPhilipp Reisner break; 4330b411b363SPhilipp Reisner default: 4331b411b363SPhilipp Reisner D_ASSERT(0); 433281e84650SAndreas Gruenbacher return false; 4333b411b363SPhilipp Reisner } 4334b411b363SPhilipp Reisner 4335b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4336b411b363SPhilipp Reisner _ack_id_to_req, __func__ , what); 4337b411b363SPhilipp Reisner } 4338b411b363SPhilipp Reisner 43390b70a13dSPhilipp Reisner static int got_NegAck(struct drbd_conf *mdev, struct p_header80 *h) 4340b411b363SPhilipp Reisner { 4341b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4342b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 43432deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 43442deb8336SPhilipp Reisner struct drbd_request *req; 43452deb8336SPhilipp Reisner struct bio_and_error m; 4346b411b363SPhilipp Reisner 4347b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4348b411b363SPhilipp Reisner 4349b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4350b411b363SPhilipp Reisner dec_rs_pending(mdev); 4351b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 435281e84650SAndreas Gruenbacher return true; 4353b411b363SPhilipp Reisner } 43542deb8336SPhilipp Reisner 43552deb8336SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 43562deb8336SPhilipp Reisner req = _ack_id_to_req(mdev, p->block_id, sector); 43572deb8336SPhilipp Reisner if (!req) { 43582deb8336SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 43592deb8336SPhilipp Reisner if (mdev->net_conf->wire_protocol == DRBD_PROT_A || 43602deb8336SPhilipp Reisner mdev->net_conf->wire_protocol == DRBD_PROT_B) { 43612deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 43622deb8336SPhilipp Reisner The master bio might already be completed, therefore the 43632deb8336SPhilipp Reisner request is no longer in the collision hash. 43642deb8336SPhilipp Reisner => Do not try to validate block_id as request. */ 43652deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 43662deb8336SPhilipp Reisner but then get a P_NEG_ACK after wards. */ 43672deb8336SPhilipp Reisner drbd_set_out_of_sync(mdev, sector, size); 43682deb8336SPhilipp Reisner return true; 43692deb8336SPhilipp Reisner } else { 43702deb8336SPhilipp Reisner dev_err(DEV, "%s: failed to find req %p, sector %llus\n", __func__, 43712deb8336SPhilipp Reisner (void *)(unsigned long)p->block_id, (unsigned long long)sector); 43722deb8336SPhilipp Reisner return false; 43732deb8336SPhilipp Reisner } 43742deb8336SPhilipp Reisner } 43752deb8336SPhilipp Reisner __req_mod(req, neg_acked, &m); 43762deb8336SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 43772deb8336SPhilipp Reisner 43782deb8336SPhilipp Reisner if (m.bio) 43792deb8336SPhilipp Reisner complete_master_bio(mdev, &m); 43802deb8336SPhilipp Reisner return true; 4381b411b363SPhilipp Reisner } 4382b411b363SPhilipp Reisner 43830b70a13dSPhilipp Reisner static int got_NegDReply(struct drbd_conf *mdev, struct p_header80 *h) 4384b411b363SPhilipp Reisner { 4385b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4386b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4387b411b363SPhilipp Reisner 4388b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4389b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4390b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4391b411b363SPhilipp Reisner 4392b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4393b411b363SPhilipp Reisner _ar_id_to_req, __func__ , neg_acked); 4394b411b363SPhilipp Reisner } 4395b411b363SPhilipp Reisner 43960b70a13dSPhilipp Reisner static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header80 *h) 4397b411b363SPhilipp Reisner { 4398b411b363SPhilipp Reisner sector_t sector; 4399b411b363SPhilipp Reisner int size; 4400b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4401b411b363SPhilipp Reisner 4402b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4403b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4404b411b363SPhilipp Reisner 4405b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4406b411b363SPhilipp Reisner 4407b411b363SPhilipp Reisner dec_rs_pending(mdev); 4408b411b363SPhilipp Reisner 4409b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4410b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4411d612d309SPhilipp Reisner switch (be16_to_cpu(h->command)) { 4412d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 4413b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4414d612d309SPhilipp Reisner case P_RS_CANCEL: 4415d612d309SPhilipp Reisner break; 4416d612d309SPhilipp Reisner default: 4417d612d309SPhilipp Reisner D_ASSERT(0); 4418d612d309SPhilipp Reisner put_ldev(mdev); 4419d612d309SPhilipp Reisner return false; 4420d612d309SPhilipp Reisner } 4421b411b363SPhilipp Reisner put_ldev(mdev); 4422b411b363SPhilipp Reisner } 4423b411b363SPhilipp Reisner 442481e84650SAndreas Gruenbacher return true; 4425b411b363SPhilipp Reisner } 4426b411b363SPhilipp Reisner 44270b70a13dSPhilipp Reisner static int got_BarrierAck(struct drbd_conf *mdev, struct p_header80 *h) 4428b411b363SPhilipp Reisner { 4429b411b363SPhilipp Reisner struct p_barrier_ack *p = (struct p_barrier_ack *)h; 4430b411b363SPhilipp Reisner 4431b411b363SPhilipp Reisner tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); 4432b411b363SPhilipp Reisner 4433c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 4434c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 4435370a43e7SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) { 4436370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 4437370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 4438c4752ef1SPhilipp Reisner } 4439c4752ef1SPhilipp Reisner 444081e84650SAndreas Gruenbacher return true; 4441b411b363SPhilipp Reisner } 4442b411b363SPhilipp Reisner 44430b70a13dSPhilipp Reisner static int got_OVResult(struct drbd_conf *mdev, struct p_header80 *h) 4444b411b363SPhilipp Reisner { 4445b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4446b411b363SPhilipp Reisner struct drbd_work *w; 4447b411b363SPhilipp Reisner sector_t sector; 4448b411b363SPhilipp Reisner int size; 4449b411b363SPhilipp Reisner 4450b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4451b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4452b411b363SPhilipp Reisner 4453b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4454b411b363SPhilipp Reisner 4455b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 4456b411b363SPhilipp Reisner drbd_ov_oos_found(mdev, sector, size); 4457b411b363SPhilipp Reisner else 4458b411b363SPhilipp Reisner ov_oos_print(mdev); 4459b411b363SPhilipp Reisner 44601d53f09eSLars Ellenberg if (!get_ldev(mdev)) 446181e84650SAndreas Gruenbacher return true; 44621d53f09eSLars Ellenberg 4463b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4464b411b363SPhilipp Reisner dec_rs_pending(mdev); 4465b411b363SPhilipp Reisner 4466ea5442afSLars Ellenberg --mdev->ov_left; 4467ea5442afSLars Ellenberg 4468ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 4469ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 4470ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 4471ea5442afSLars Ellenberg 4472ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 4473b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4474b411b363SPhilipp Reisner if (w) { 4475b411b363SPhilipp Reisner w->cb = w_ov_finished; 4476b411b363SPhilipp Reisner drbd_queue_work_front(&mdev->data.work, w); 4477b411b363SPhilipp Reisner } else { 4478b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 4479b411b363SPhilipp Reisner ov_oos_print(mdev); 4480b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4481b411b363SPhilipp Reisner } 4482b411b363SPhilipp Reisner } 44831d53f09eSLars Ellenberg put_ldev(mdev); 448481e84650SAndreas Gruenbacher return true; 4485b411b363SPhilipp Reisner } 4486b411b363SPhilipp Reisner 448702918be2SPhilipp Reisner static int got_skip(struct drbd_conf *mdev, struct p_header80 *h) 44880ced55a3SPhilipp Reisner { 448981e84650SAndreas Gruenbacher return true; 44900ced55a3SPhilipp Reisner } 44910ced55a3SPhilipp Reisner 4492b411b363SPhilipp Reisner struct asender_cmd { 4493b411b363SPhilipp Reisner size_t pkt_size; 44940b70a13dSPhilipp Reisner int (*process)(struct drbd_conf *mdev, struct p_header80 *h); 4495b411b363SPhilipp Reisner }; 4496b411b363SPhilipp Reisner 4497b411b363SPhilipp Reisner static struct asender_cmd *get_asender_cmd(int cmd) 4498b411b363SPhilipp Reisner { 4499b411b363SPhilipp Reisner static struct asender_cmd asender_tbl[] = { 4500b411b363SPhilipp Reisner /* anything missing from this table is in 4501b411b363SPhilipp Reisner * the drbd_cmd_handler (drbd_default_handler) table, 4502b411b363SPhilipp Reisner * see the beginning of drbdd() */ 45030b70a13dSPhilipp Reisner [P_PING] = { sizeof(struct p_header80), got_Ping }, 45040b70a13dSPhilipp Reisner [P_PING_ACK] = { sizeof(struct p_header80), got_PingAck }, 4505b411b363SPhilipp Reisner [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4506b411b363SPhilipp Reisner [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4507b411b363SPhilipp Reisner [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4508b411b363SPhilipp Reisner [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4509b411b363SPhilipp Reisner [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 4510b411b363SPhilipp Reisner [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 4511b411b363SPhilipp Reisner [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4512b411b363SPhilipp Reisner [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 4513b411b363SPhilipp Reisner [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 4514b411b363SPhilipp Reisner [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 4515b411b363SPhilipp Reisner [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 451602918be2SPhilipp Reisner [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 4517d612d309SPhilipp Reisner [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4518b411b363SPhilipp Reisner [P_MAX_CMD] = { 0, NULL }, 4519b411b363SPhilipp Reisner }; 4520b411b363SPhilipp Reisner if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) 4521b411b363SPhilipp Reisner return NULL; 4522b411b363SPhilipp Reisner return &asender_tbl[cmd]; 4523b411b363SPhilipp Reisner } 4524b411b363SPhilipp Reisner 4525b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4526b411b363SPhilipp Reisner { 4527b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 452802918be2SPhilipp Reisner struct p_header80 *h = &mdev->meta.rbuf.header.h80; 4529b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 4530b411b363SPhilipp Reisner 4531b411b363SPhilipp Reisner int rv, len; 4532b411b363SPhilipp Reisner void *buf = h; 4533b411b363SPhilipp Reisner int received = 0; 45340b70a13dSPhilipp Reisner int expect = sizeof(struct p_header80); 4535b411b363SPhilipp Reisner int empty; 4536f36af18cSLars Ellenberg int ping_timeout_active = 0; 4537b411b363SPhilipp Reisner 4538b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); 4539b411b363SPhilipp Reisner 4540b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 4541b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 4542b411b363SPhilipp Reisner 4543b411b363SPhilipp Reisner while (get_t_state(thi) == Running) { 4544b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 4545b411b363SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &mdev->flags)) { 4546b411b363SPhilipp Reisner ERR_IF(!drbd_send_ping(mdev)) goto reconnect; 4547b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = 4548b411b363SPhilipp Reisner mdev->net_conf->ping_timeo*HZ/10; 4549f36af18cSLars Ellenberg ping_timeout_active = 1; 4550b411b363SPhilipp Reisner } 4551b411b363SPhilipp Reisner 4552b411b363SPhilipp Reisner /* conditionally cork; 4553b411b363SPhilipp Reisner * it may hurt latency if we cork without much to send */ 4554b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork && 4555b411b363SPhilipp Reisner 3 < atomic_read(&mdev->unacked_cnt)) 4556b411b363SPhilipp Reisner drbd_tcp_cork(mdev->meta.socket); 4557b411b363SPhilipp Reisner while (1) { 4558b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4559b411b363SPhilipp Reisner flush_signals(current); 45600f8488e1SLars Ellenberg if (!drbd_process_done_ee(mdev)) 4561b411b363SPhilipp Reisner goto reconnect; 4562b411b363SPhilipp Reisner /* to avoid race with newly queued ACKs */ 4563b411b363SPhilipp Reisner set_bit(SIGNAL_ASENDER, &mdev->flags); 4564b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4565b411b363SPhilipp Reisner empty = list_empty(&mdev->done_ee); 4566b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4567b411b363SPhilipp Reisner /* new ack may have been queued right here, 4568b411b363SPhilipp Reisner * but then there is also a signal pending, 4569b411b363SPhilipp Reisner * and we start over... */ 4570b411b363SPhilipp Reisner if (empty) 4571b411b363SPhilipp Reisner break; 4572b411b363SPhilipp Reisner } 4573b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 4574b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork) 4575b411b363SPhilipp Reisner drbd_tcp_uncork(mdev->meta.socket); 4576b411b363SPhilipp Reisner 4577b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 4578b411b363SPhilipp Reisner if (signal_pending(current)) 4579b411b363SPhilipp Reisner continue; 4580b411b363SPhilipp Reisner 4581b411b363SPhilipp Reisner rv = drbd_recv_short(mdev, mdev->meta.socket, 4582b411b363SPhilipp Reisner buf, expect-received, 0); 4583b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4584b411b363SPhilipp Reisner 4585b411b363SPhilipp Reisner flush_signals(current); 4586b411b363SPhilipp Reisner 4587b411b363SPhilipp Reisner /* Note: 4588b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 4589b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 4590b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 4591b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 4592b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 4593b411b363SPhilipp Reisner * rv == expected: full header or command 4594b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 4595b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 4596b411b363SPhilipp Reisner */ 4597b411b363SPhilipp Reisner if (likely(rv > 0)) { 4598b411b363SPhilipp Reisner received += rv; 4599b411b363SPhilipp Reisner buf += rv; 4600b411b363SPhilipp Reisner } else if (rv == 0) { 4601b411b363SPhilipp Reisner dev_err(DEV, "meta connection shut down by peer.\n"); 4602b411b363SPhilipp Reisner goto reconnect; 4603b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 4604cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 4605cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 4606cb6518cbSLars Ellenberg if (time_after(mdev->last_received, 4607cb6518cbSLars Ellenberg jiffies - mdev->meta.socket->sk->sk_rcvtimeo)) 4608cb6518cbSLars Ellenberg continue; 4609f36af18cSLars Ellenberg if (ping_timeout_active) { 4610b411b363SPhilipp Reisner dev_err(DEV, "PingAck did not arrive in time.\n"); 4611b411b363SPhilipp Reisner goto reconnect; 4612b411b363SPhilipp Reisner } 4613b411b363SPhilipp Reisner set_bit(SEND_PING, &mdev->flags); 4614b411b363SPhilipp Reisner continue; 4615b411b363SPhilipp Reisner } else if (rv == -EINTR) { 4616b411b363SPhilipp Reisner continue; 4617b411b363SPhilipp Reisner } else { 4618b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 4619b411b363SPhilipp Reisner goto reconnect; 4620b411b363SPhilipp Reisner } 4621b411b363SPhilipp Reisner 4622b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 4623b411b363SPhilipp Reisner if (unlikely(h->magic != BE_DRBD_MAGIC)) { 4624004352faSLars Ellenberg dev_err(DEV, "magic?? on meta m: 0x%08x c: %d l: %d\n", 4625004352faSLars Ellenberg be32_to_cpu(h->magic), 4626004352faSLars Ellenberg be16_to_cpu(h->command), 4627004352faSLars Ellenberg be16_to_cpu(h->length)); 4628b411b363SPhilipp Reisner goto reconnect; 4629b411b363SPhilipp Reisner } 4630b411b363SPhilipp Reisner cmd = get_asender_cmd(be16_to_cpu(h->command)); 4631b411b363SPhilipp Reisner len = be16_to_cpu(h->length); 4632b411b363SPhilipp Reisner if (unlikely(cmd == NULL)) { 4633004352faSLars Ellenberg dev_err(DEV, "unknown command?? on meta m: 0x%08x c: %d l: %d\n", 4634004352faSLars Ellenberg be32_to_cpu(h->magic), 4635004352faSLars Ellenberg be16_to_cpu(h->command), 4636004352faSLars Ellenberg be16_to_cpu(h->length)); 4637b411b363SPhilipp Reisner goto disconnect; 4638b411b363SPhilipp Reisner } 4639b411b363SPhilipp Reisner expect = cmd->pkt_size; 46400b70a13dSPhilipp Reisner ERR_IF(len != expect-sizeof(struct p_header80)) 4641b411b363SPhilipp Reisner goto reconnect; 4642b411b363SPhilipp Reisner } 4643b411b363SPhilipp Reisner if (received == expect) { 4644cb6518cbSLars Ellenberg mdev->last_received = jiffies; 4645b411b363SPhilipp Reisner D_ASSERT(cmd != NULL); 4646b411b363SPhilipp Reisner if (!cmd->process(mdev, h)) 4647b411b363SPhilipp Reisner goto reconnect; 4648b411b363SPhilipp Reisner 4649f36af18cSLars Ellenberg /* the idle_timeout (ping-int) 4650f36af18cSLars Ellenberg * has been restored in got_PingAck() */ 4651f36af18cSLars Ellenberg if (cmd == get_asender_cmd(P_PING_ACK)) 4652f36af18cSLars Ellenberg ping_timeout_active = 0; 4653f36af18cSLars Ellenberg 4654b411b363SPhilipp Reisner buf = h; 4655b411b363SPhilipp Reisner received = 0; 46560b70a13dSPhilipp Reisner expect = sizeof(struct p_header80); 4657b411b363SPhilipp Reisner cmd = NULL; 4658b411b363SPhilipp Reisner } 4659b411b363SPhilipp Reisner } 4660b411b363SPhilipp Reisner 4661b411b363SPhilipp Reisner if (0) { 4662b411b363SPhilipp Reisner reconnect: 4663b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); 4664856c50c7SLars Ellenberg drbd_md_sync(mdev); 4665b411b363SPhilipp Reisner } 4666b411b363SPhilipp Reisner if (0) { 4667b411b363SPhilipp Reisner disconnect: 4668b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4669856c50c7SLars Ellenberg drbd_md_sync(mdev); 4670b411b363SPhilipp Reisner } 4671b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4672b411b363SPhilipp Reisner 4673b411b363SPhilipp Reisner D_ASSERT(mdev->state.conn < C_CONNECTED); 4674b411b363SPhilipp Reisner dev_info(DEV, "asender terminated\n"); 4675b411b363SPhilipp Reisner 4676b411b363SPhilipp Reisner return 0; 4677b411b363SPhilipp Reisner } 4678