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; 46947a4f1c1SLars Ellenberg __module_get((*newsock)->ops->owner); 470b411b363SPhilipp Reisner 471b411b363SPhilipp Reisner out: 472b411b363SPhilipp Reisner return err; 473b411b363SPhilipp Reisner } 474b411b363SPhilipp Reisner 475b411b363SPhilipp Reisner static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock, 476b411b363SPhilipp Reisner void *buf, size_t size, int flags) 477b411b363SPhilipp Reisner { 478b411b363SPhilipp Reisner mm_segment_t oldfs; 479b411b363SPhilipp Reisner struct kvec iov = { 480b411b363SPhilipp Reisner .iov_base = buf, 481b411b363SPhilipp Reisner .iov_len = size, 482b411b363SPhilipp Reisner }; 483b411b363SPhilipp Reisner struct msghdr msg = { 484b411b363SPhilipp Reisner .msg_iovlen = 1, 485b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 486b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 487b411b363SPhilipp Reisner }; 488b411b363SPhilipp Reisner int rv; 489b411b363SPhilipp Reisner 490b411b363SPhilipp Reisner oldfs = get_fs(); 491b411b363SPhilipp Reisner set_fs(KERNEL_DS); 492b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 493b411b363SPhilipp Reisner set_fs(oldfs); 494b411b363SPhilipp Reisner 495b411b363SPhilipp Reisner return rv; 496b411b363SPhilipp Reisner } 497b411b363SPhilipp Reisner 498b411b363SPhilipp Reisner static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size) 499b411b363SPhilipp Reisner { 500b411b363SPhilipp Reisner mm_segment_t oldfs; 501b411b363SPhilipp Reisner struct kvec iov = { 502b411b363SPhilipp Reisner .iov_base = buf, 503b411b363SPhilipp Reisner .iov_len = size, 504b411b363SPhilipp Reisner }; 505b411b363SPhilipp Reisner struct msghdr msg = { 506b411b363SPhilipp Reisner .msg_iovlen = 1, 507b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 508b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 509b411b363SPhilipp Reisner }; 510b411b363SPhilipp Reisner int rv; 511b411b363SPhilipp Reisner 512b411b363SPhilipp Reisner oldfs = get_fs(); 513b411b363SPhilipp Reisner set_fs(KERNEL_DS); 514b411b363SPhilipp Reisner 515b411b363SPhilipp Reisner for (;;) { 516b411b363SPhilipp Reisner rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags); 517b411b363SPhilipp Reisner if (rv == size) 518b411b363SPhilipp Reisner break; 519b411b363SPhilipp Reisner 520b411b363SPhilipp Reisner /* Note: 521b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 522b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 523b411b363SPhilipp Reisner */ 524b411b363SPhilipp Reisner 525b411b363SPhilipp Reisner if (rv < 0) { 526b411b363SPhilipp Reisner if (rv == -ECONNRESET) 527b411b363SPhilipp Reisner dev_info(DEV, "sock was reset by peer\n"); 528b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 529b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 530b411b363SPhilipp Reisner break; 531b411b363SPhilipp Reisner } else if (rv == 0) { 532b411b363SPhilipp Reisner dev_info(DEV, "sock was shut down by peer\n"); 533b411b363SPhilipp Reisner break; 534b411b363SPhilipp Reisner } else { 535b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 536b411b363SPhilipp Reisner * after we read a partial message 537b411b363SPhilipp Reisner */ 538b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 539b411b363SPhilipp Reisner break; 540b411b363SPhilipp Reisner } 541b411b363SPhilipp Reisner }; 542b411b363SPhilipp Reisner 543b411b363SPhilipp Reisner set_fs(oldfs); 544b411b363SPhilipp Reisner 545b411b363SPhilipp Reisner if (rv != size) 546b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); 547b411b363SPhilipp Reisner 548b411b363SPhilipp Reisner return rv; 549b411b363SPhilipp Reisner } 550b411b363SPhilipp Reisner 5515dbf1673SLars Ellenberg /* quoting tcp(7): 5525dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5535dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5545dbf1673SLars Ellenberg * This is our wrapper to do so. 5555dbf1673SLars Ellenberg */ 5565dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 5575dbf1673SLars Ellenberg unsigned int rcv) 5585dbf1673SLars Ellenberg { 5595dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 5605dbf1673SLars Ellenberg if (snd) { 5615dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 5625dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 5635dbf1673SLars Ellenberg } 5645dbf1673SLars Ellenberg if (rcv) { 5655dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 5665dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 5675dbf1673SLars Ellenberg } 5685dbf1673SLars Ellenberg } 5695dbf1673SLars Ellenberg 570b411b363SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_conf *mdev) 571b411b363SPhilipp Reisner { 572b411b363SPhilipp Reisner const char *what; 573b411b363SPhilipp Reisner struct socket *sock; 574b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 575b411b363SPhilipp Reisner int err; 576b411b363SPhilipp Reisner int disconnect_on_error = 1; 577b411b363SPhilipp Reisner 578b411b363SPhilipp Reisner if (!get_net_conf(mdev)) 579b411b363SPhilipp Reisner return NULL; 580b411b363SPhilipp Reisner 581b411b363SPhilipp Reisner what = "sock_create_kern"; 582b411b363SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, 583b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 584b411b363SPhilipp Reisner if (err < 0) { 585b411b363SPhilipp Reisner sock = NULL; 586b411b363SPhilipp Reisner goto out; 587b411b363SPhilipp Reisner } 588b411b363SPhilipp Reisner 589b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 590b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ; 5915dbf1673SLars Ellenberg drbd_setbufsize(sock, mdev->net_conf->sndbuf_size, 5925dbf1673SLars Ellenberg mdev->net_conf->rcvbuf_size); 593b411b363SPhilipp Reisner 594b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 595b411b363SPhilipp Reisner * for the outgoing connections. 596b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 597b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 598b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 599b411b363SPhilipp Reisner * a free one dynamically. 600b411b363SPhilipp Reisner */ 601b411b363SPhilipp Reisner memcpy(&src_in6, mdev->net_conf->my_addr, 602b411b363SPhilipp Reisner min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6))); 603b411b363SPhilipp Reisner if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6) 604b411b363SPhilipp Reisner src_in6.sin6_port = 0; 605b411b363SPhilipp Reisner else 606b411b363SPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 607b411b363SPhilipp Reisner 608b411b363SPhilipp Reisner what = "bind before connect"; 609b411b363SPhilipp Reisner err = sock->ops->bind(sock, 610b411b363SPhilipp Reisner (struct sockaddr *) &src_in6, 611b411b363SPhilipp Reisner mdev->net_conf->my_addr_len); 612b411b363SPhilipp Reisner if (err < 0) 613b411b363SPhilipp Reisner goto out; 614b411b363SPhilipp Reisner 615b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 616b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 617b411b363SPhilipp Reisner disconnect_on_error = 0; 618b411b363SPhilipp Reisner what = "connect"; 619b411b363SPhilipp Reisner err = sock->ops->connect(sock, 620b411b363SPhilipp Reisner (struct sockaddr *)mdev->net_conf->peer_addr, 621b411b363SPhilipp Reisner mdev->net_conf->peer_addr_len, 0); 622b411b363SPhilipp Reisner 623b411b363SPhilipp Reisner out: 624b411b363SPhilipp Reisner if (err < 0) { 625b411b363SPhilipp Reisner if (sock) { 626b411b363SPhilipp Reisner sock_release(sock); 627b411b363SPhilipp Reisner sock = NULL; 628b411b363SPhilipp Reisner } 629b411b363SPhilipp Reisner switch (-err) { 630b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 631b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 632b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 633b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 634b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 635b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 636b411b363SPhilipp Reisner disconnect_on_error = 0; 637b411b363SPhilipp Reisner break; 638b411b363SPhilipp Reisner default: 639b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 640b411b363SPhilipp Reisner } 641b411b363SPhilipp Reisner if (disconnect_on_error) 642b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 643b411b363SPhilipp Reisner } 644b411b363SPhilipp Reisner put_net_conf(mdev); 645b411b363SPhilipp Reisner return sock; 646b411b363SPhilipp Reisner } 647b411b363SPhilipp Reisner 648b411b363SPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev) 649b411b363SPhilipp Reisner { 650b411b363SPhilipp Reisner int timeo, err; 651b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 652b411b363SPhilipp Reisner const char *what; 653b411b363SPhilipp Reisner 654b411b363SPhilipp Reisner if (!get_net_conf(mdev)) 655b411b363SPhilipp Reisner return NULL; 656b411b363SPhilipp Reisner 657b411b363SPhilipp Reisner what = "sock_create_kern"; 658b411b363SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, 659b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 660b411b363SPhilipp Reisner if (err) { 661b411b363SPhilipp Reisner s_listen = NULL; 662b411b363SPhilipp Reisner goto out; 663b411b363SPhilipp Reisner } 664b411b363SPhilipp Reisner 665b411b363SPhilipp Reisner timeo = mdev->net_conf->try_connect_int * HZ; 666b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 667b411b363SPhilipp Reisner 668b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 669b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 670b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 6715dbf1673SLars Ellenberg drbd_setbufsize(s_listen, mdev->net_conf->sndbuf_size, 6725dbf1673SLars Ellenberg mdev->net_conf->rcvbuf_size); 673b411b363SPhilipp Reisner 674b411b363SPhilipp Reisner what = "bind before listen"; 675b411b363SPhilipp Reisner err = s_listen->ops->bind(s_listen, 676b411b363SPhilipp Reisner (struct sockaddr *) mdev->net_conf->my_addr, 677b411b363SPhilipp Reisner mdev->net_conf->my_addr_len); 678b411b363SPhilipp Reisner if (err < 0) 679b411b363SPhilipp Reisner goto out; 680b411b363SPhilipp Reisner 681b411b363SPhilipp Reisner err = drbd_accept(mdev, &what, s_listen, &s_estab); 682b411b363SPhilipp Reisner 683b411b363SPhilipp Reisner out: 684b411b363SPhilipp Reisner if (s_listen) 685b411b363SPhilipp Reisner sock_release(s_listen); 686b411b363SPhilipp Reisner if (err < 0) { 687b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 688b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 689b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 690b411b363SPhilipp Reisner } 691b411b363SPhilipp Reisner } 692b411b363SPhilipp Reisner put_net_conf(mdev); 693b411b363SPhilipp Reisner 694b411b363SPhilipp Reisner return s_estab; 695b411b363SPhilipp Reisner } 696b411b363SPhilipp Reisner 697b411b363SPhilipp Reisner static int drbd_send_fp(struct drbd_conf *mdev, 698b411b363SPhilipp Reisner struct socket *sock, enum drbd_packets cmd) 699b411b363SPhilipp Reisner { 70002918be2SPhilipp Reisner struct p_header80 *h = &mdev->data.sbuf.header.h80; 701b411b363SPhilipp Reisner 702b411b363SPhilipp Reisner return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0); 703b411b363SPhilipp Reisner } 704b411b363SPhilipp Reisner 705b411b363SPhilipp Reisner static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock) 706b411b363SPhilipp Reisner { 70702918be2SPhilipp Reisner struct p_header80 *h = &mdev->data.rbuf.header.h80; 708b411b363SPhilipp Reisner int rr; 709b411b363SPhilipp Reisner 710b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0); 711b411b363SPhilipp Reisner 712b411b363SPhilipp Reisner if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC) 713b411b363SPhilipp Reisner return be16_to_cpu(h->command); 714b411b363SPhilipp Reisner 715b411b363SPhilipp Reisner return 0xffff; 716b411b363SPhilipp Reisner } 717b411b363SPhilipp Reisner 718b411b363SPhilipp Reisner /** 719b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 720b411b363SPhilipp Reisner * @mdev: DRBD device. 721b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 722b411b363SPhilipp Reisner */ 723b411b363SPhilipp Reisner static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock) 724b411b363SPhilipp Reisner { 725b411b363SPhilipp Reisner int rr; 726b411b363SPhilipp Reisner char tb[4]; 727b411b363SPhilipp Reisner 728b411b363SPhilipp Reisner if (!*sock) 72981e84650SAndreas Gruenbacher return false; 730b411b363SPhilipp Reisner 731b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 732b411b363SPhilipp Reisner 733b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 73481e84650SAndreas Gruenbacher return true; 735b411b363SPhilipp Reisner } else { 736b411b363SPhilipp Reisner sock_release(*sock); 737b411b363SPhilipp Reisner *sock = NULL; 73881e84650SAndreas Gruenbacher return false; 739b411b363SPhilipp Reisner } 740b411b363SPhilipp Reisner } 741b411b363SPhilipp Reisner 742b411b363SPhilipp Reisner /* 743b411b363SPhilipp Reisner * return values: 744b411b363SPhilipp Reisner * 1 yes, we have a valid connection 745b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 746b411b363SPhilipp Reisner * -1 peer talks different language, 747b411b363SPhilipp Reisner * no point in trying again, please go standalone. 748b411b363SPhilipp Reisner * -2 We do not have a network config... 749b411b363SPhilipp Reisner */ 750b411b363SPhilipp Reisner static int drbd_connect(struct drbd_conf *mdev) 751b411b363SPhilipp Reisner { 752b411b363SPhilipp Reisner struct socket *s, *sock, *msock; 753b411b363SPhilipp Reisner int try, h, ok; 754197296ffSPhilipp Reisner enum drbd_state_rv rv; 755b411b363SPhilipp Reisner 756b411b363SPhilipp Reisner D_ASSERT(!mdev->data.socket); 757b411b363SPhilipp Reisner 758b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS) 759b411b363SPhilipp Reisner return -2; 760b411b363SPhilipp Reisner 761b411b363SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &mdev->flags); 762b411b363SPhilipp Reisner 763b411b363SPhilipp Reisner sock = NULL; 764b411b363SPhilipp Reisner msock = NULL; 765b411b363SPhilipp Reisner 766b411b363SPhilipp Reisner do { 767b411b363SPhilipp Reisner for (try = 0;;) { 768b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 769b411b363SPhilipp Reisner s = drbd_try_connect(mdev); 770b411b363SPhilipp Reisner if (s || ++try >= 3) 771b411b363SPhilipp Reisner break; 772b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 77320ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 774b411b363SPhilipp Reisner } 775b411b363SPhilipp Reisner 776b411b363SPhilipp Reisner if (s) { 777b411b363SPhilipp Reisner if (!sock) { 778b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_S); 779b411b363SPhilipp Reisner sock = s; 780b411b363SPhilipp Reisner s = NULL; 781b411b363SPhilipp Reisner } else if (!msock) { 782b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_M); 783b411b363SPhilipp Reisner msock = s; 784b411b363SPhilipp Reisner s = NULL; 785b411b363SPhilipp Reisner } else { 786b411b363SPhilipp Reisner dev_err(DEV, "Logic error in drbd_connect()\n"); 787b411b363SPhilipp Reisner goto out_release_sockets; 788b411b363SPhilipp Reisner } 789b411b363SPhilipp Reisner } 790b411b363SPhilipp Reisner 791b411b363SPhilipp Reisner if (sock && msock) { 792a8e40792SPhilipp Reisner schedule_timeout_interruptible(mdev->net_conf->ping_timeo*HZ/10); 793b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 794b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 795b411b363SPhilipp Reisner if (ok) 796b411b363SPhilipp Reisner break; 797b411b363SPhilipp Reisner } 798b411b363SPhilipp Reisner 799b411b363SPhilipp Reisner retry: 800b411b363SPhilipp Reisner s = drbd_wait_for_connect(mdev); 801b411b363SPhilipp Reisner if (s) { 802b411b363SPhilipp Reisner try = drbd_recv_fp(mdev, s); 803b411b363SPhilipp Reisner drbd_socket_okay(mdev, &sock); 804b411b363SPhilipp Reisner drbd_socket_okay(mdev, &msock); 805b411b363SPhilipp Reisner switch (try) { 806b411b363SPhilipp Reisner case P_HAND_SHAKE_S: 807b411b363SPhilipp Reisner if (sock) { 808b411b363SPhilipp Reisner dev_warn(DEV, "initial packet S crossed\n"); 809b411b363SPhilipp Reisner sock_release(sock); 810b411b363SPhilipp Reisner } 811b411b363SPhilipp Reisner sock = s; 812b411b363SPhilipp Reisner break; 813b411b363SPhilipp Reisner case P_HAND_SHAKE_M: 814b411b363SPhilipp Reisner if (msock) { 815b411b363SPhilipp Reisner dev_warn(DEV, "initial packet M crossed\n"); 816b411b363SPhilipp Reisner sock_release(msock); 817b411b363SPhilipp Reisner } 818b411b363SPhilipp Reisner msock = s; 819b411b363SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &mdev->flags); 820b411b363SPhilipp Reisner break; 821b411b363SPhilipp Reisner default: 822b411b363SPhilipp Reisner dev_warn(DEV, "Error receiving initial packet\n"); 823b411b363SPhilipp Reisner sock_release(s); 824b411b363SPhilipp Reisner if (random32() & 1) 825b411b363SPhilipp Reisner goto retry; 826b411b363SPhilipp Reisner } 827b411b363SPhilipp Reisner } 828b411b363SPhilipp Reisner 829b411b363SPhilipp Reisner if (mdev->state.conn <= C_DISCONNECTING) 830b411b363SPhilipp Reisner goto out_release_sockets; 831b411b363SPhilipp Reisner if (signal_pending(current)) { 832b411b363SPhilipp Reisner flush_signals(current); 833b411b363SPhilipp Reisner smp_rmb(); 834b411b363SPhilipp Reisner if (get_t_state(&mdev->receiver) == Exiting) 835b411b363SPhilipp Reisner goto out_release_sockets; 836b411b363SPhilipp Reisner } 837b411b363SPhilipp Reisner 838b411b363SPhilipp Reisner if (sock && msock) { 839b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 840b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 841b411b363SPhilipp Reisner if (ok) 842b411b363SPhilipp Reisner break; 843b411b363SPhilipp Reisner } 844b411b363SPhilipp Reisner } while (1); 845b411b363SPhilipp Reisner 846b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 847b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 848b411b363SPhilipp Reisner 849b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 850b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 851b411b363SPhilipp Reisner 852b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 853b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 854b411b363SPhilipp Reisner 855b411b363SPhilipp Reisner /* NOT YET ... 856b411b363SPhilipp Reisner * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 857b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 858b411b363SPhilipp Reisner * first set it to the P_HAND_SHAKE timeout, 859b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 860b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = 861b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10; 862b411b363SPhilipp Reisner 863b411b363SPhilipp Reisner msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 864b411b363SPhilipp Reisner msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 865b411b363SPhilipp Reisner 866b411b363SPhilipp Reisner /* we don't want delays. 86725985edcSLucas De Marchi * we use TCP_CORK where appropriate, though */ 868b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 869b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 870b411b363SPhilipp Reisner 871b411b363SPhilipp Reisner mdev->data.socket = sock; 872b411b363SPhilipp Reisner mdev->meta.socket = msock; 873b411b363SPhilipp Reisner mdev->last_received = jiffies; 874b411b363SPhilipp Reisner 875b411b363SPhilipp Reisner D_ASSERT(mdev->asender.task == NULL); 876b411b363SPhilipp Reisner 877b411b363SPhilipp Reisner h = drbd_do_handshake(mdev); 878b411b363SPhilipp Reisner if (h <= 0) 879b411b363SPhilipp Reisner return h; 880b411b363SPhilipp Reisner 881b411b363SPhilipp Reisner if (mdev->cram_hmac_tfm) { 882b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 883b10d96cbSJohannes Thoma switch (drbd_do_auth(mdev)) { 884b10d96cbSJohannes Thoma case -1: 885b411b363SPhilipp Reisner dev_err(DEV, "Authentication of peer failed\n"); 886b411b363SPhilipp Reisner return -1; 887b10d96cbSJohannes Thoma case 0: 888b10d96cbSJohannes Thoma dev_err(DEV, "Authentication of peer failed, trying again.\n"); 889b10d96cbSJohannes Thoma return 0; 890b411b363SPhilipp Reisner } 891b411b363SPhilipp Reisner } 892b411b363SPhilipp Reisner 893b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 894b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 895b411b363SPhilipp Reisner 896b411b363SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 897b411b363SPhilipp Reisner mdev->peer_seq = 0; 898b411b363SPhilipp Reisner 899148efa16SPhilipp Reisner if (drbd_send_protocol(mdev) == -1) 9007e2455c1SPhilipp Reisner return -1; 901197296ffSPhilipp Reisner set_bit(STATE_SENT, &mdev->flags); 902b411b363SPhilipp Reisner drbd_send_sync_param(mdev, &mdev->sync_conf); 903e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, 0); 904b411b363SPhilipp Reisner drbd_send_uuids(mdev); 905f479ea06SLars Ellenberg drbd_send_current_state(mdev); 906b411b363SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 907b411b363SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 9081e86ac48SPhilipp Reisner 909197296ffSPhilipp Reisner spin_lock_irq(&mdev->req_lock); 910197296ffSPhilipp Reisner rv = _drbd_set_state(_NS(mdev, conn, C_WF_REPORT_PARAMS), CS_VERBOSE, NULL); 911197296ffSPhilipp Reisner if (mdev->state.conn != C_WF_REPORT_PARAMS) 912197296ffSPhilipp Reisner clear_bit(STATE_SENT, &mdev->flags); 913197296ffSPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 914197296ffSPhilipp Reisner 915197296ffSPhilipp Reisner if (rv < SS_SUCCESS) 9161e86ac48SPhilipp Reisner return 0; 9171e86ac48SPhilipp Reisner 9181e86ac48SPhilipp Reisner drbd_thread_start(&mdev->asender); 9197fde2be9SPhilipp Reisner mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ 920b411b363SPhilipp Reisner 921b411b363SPhilipp Reisner return 1; 922b411b363SPhilipp Reisner 923b411b363SPhilipp Reisner out_release_sockets: 924b411b363SPhilipp Reisner if (sock) 925b411b363SPhilipp Reisner sock_release(sock); 926b411b363SPhilipp Reisner if (msock) 927b411b363SPhilipp Reisner sock_release(msock); 928b411b363SPhilipp Reisner return -1; 929b411b363SPhilipp Reisner } 930b411b363SPhilipp Reisner 93102918be2SPhilipp Reisner static int drbd_recv_header(struct drbd_conf *mdev, enum drbd_packets *cmd, unsigned int *packet_size) 932b411b363SPhilipp Reisner { 93302918be2SPhilipp Reisner union p_header *h = &mdev->data.rbuf.header; 934b411b363SPhilipp Reisner int r; 935b411b363SPhilipp Reisner 936b411b363SPhilipp Reisner r = drbd_recv(mdev, h, sizeof(*h)); 937b411b363SPhilipp Reisner if (unlikely(r != sizeof(*h))) { 9380ddc5549SLars Ellenberg if (!signal_pending(current)) 9390ddc5549SLars Ellenberg dev_warn(DEV, "short read expecting header on sock: r=%d\n", r); 94081e84650SAndreas Gruenbacher return false; 94102918be2SPhilipp Reisner } 94202918be2SPhilipp Reisner 94302918be2SPhilipp Reisner if (likely(h->h80.magic == BE_DRBD_MAGIC)) { 94402918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h80.command); 94502918be2SPhilipp Reisner *packet_size = be16_to_cpu(h->h80.length); 94602918be2SPhilipp Reisner } else if (h->h95.magic == BE_DRBD_MAGIC_BIG) { 94702918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h95.command); 94802918be2SPhilipp Reisner *packet_size = be32_to_cpu(h->h95.length); 94902918be2SPhilipp Reisner } else { 950004352faSLars Ellenberg dev_err(DEV, "magic?? on data m: 0x%08x c: %d l: %d\n", 951004352faSLars Ellenberg be32_to_cpu(h->h80.magic), 952004352faSLars Ellenberg be16_to_cpu(h->h80.command), 953004352faSLars Ellenberg be16_to_cpu(h->h80.length)); 95481e84650SAndreas Gruenbacher return false; 955b411b363SPhilipp Reisner } 956b411b363SPhilipp Reisner mdev->last_received = jiffies; 957b411b363SPhilipp Reisner 95881e84650SAndreas Gruenbacher return true; 959b411b363SPhilipp Reisner } 960b411b363SPhilipp Reisner 9612451fc3bSPhilipp Reisner static void drbd_flush(struct drbd_conf *mdev) 962b411b363SPhilipp Reisner { 963b411b363SPhilipp Reisner int rv; 964b411b363SPhilipp Reisner 965b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 966fbd9b09aSDmitry Monakhov rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, 967dd3932edSChristoph Hellwig NULL); 968b411b363SPhilipp Reisner if (rv) { 969ebd2b0cdSPhilipp Reisner dev_info(DEV, "local disk flush failed with status %d\n", rv); 970b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 971b411b363SPhilipp Reisner * don't try again for ANY return value != 0 972b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 973b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 974b411b363SPhilipp Reisner } 975b411b363SPhilipp Reisner put_ldev(mdev); 976b411b363SPhilipp Reisner } 977b411b363SPhilipp Reisner } 978b411b363SPhilipp Reisner 979b411b363SPhilipp Reisner /** 980b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 981b411b363SPhilipp Reisner * @mdev: DRBD device. 982b411b363SPhilipp Reisner * @epoch: Epoch object. 983b411b363SPhilipp Reisner * @ev: Epoch event. 984b411b363SPhilipp Reisner */ 985b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 986b411b363SPhilipp Reisner struct drbd_epoch *epoch, 987b411b363SPhilipp Reisner enum epoch_event ev) 988b411b363SPhilipp Reisner { 9892451fc3bSPhilipp Reisner int epoch_size; 990b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 991b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 992b411b363SPhilipp Reisner 993b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 994b411b363SPhilipp Reisner do { 995b411b363SPhilipp Reisner next_epoch = NULL; 996b411b363SPhilipp Reisner 997b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 998b411b363SPhilipp Reisner 999b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 1000b411b363SPhilipp Reisner case EV_PUT: 1001b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1002b411b363SPhilipp Reisner break; 1003b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1004b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1005b411b363SPhilipp Reisner break; 1006b411b363SPhilipp Reisner case EV_BECAME_LAST: 1007b411b363SPhilipp Reisner /* nothing to do*/ 1008b411b363SPhilipp Reisner break; 1009b411b363SPhilipp Reisner } 1010b411b363SPhilipp Reisner 1011b411b363SPhilipp Reisner if (epoch_size != 0 && 1012b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 101380f9fd55SPhilipp Reisner (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { 1014b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1015b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1016b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1017b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1018b411b363SPhilipp Reisner } 101980f9fd55SPhilipp Reisner if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) 1020b411b363SPhilipp Reisner dec_unacked(mdev); 1021b411b363SPhilipp Reisner 1022b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1023b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1024b411b363SPhilipp Reisner list_del(&epoch->list); 1025b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1026b411b363SPhilipp Reisner mdev->epochs--; 1027b411b363SPhilipp Reisner kfree(epoch); 1028b411b363SPhilipp Reisner 1029b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1030b411b363SPhilipp Reisner rv = FE_DESTROYED; 1031b411b363SPhilipp Reisner } else { 1032b411b363SPhilipp Reisner epoch->flags = 0; 1033b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1034698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1035b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1036b411b363SPhilipp Reisner rv = FE_RECYCLED; 10372451fc3bSPhilipp Reisner wake_up(&mdev->ee_wait); 1038b411b363SPhilipp Reisner } 1039b411b363SPhilipp Reisner } 1040b411b363SPhilipp Reisner 1041b411b363SPhilipp Reisner if (!next_epoch) 1042b411b363SPhilipp Reisner break; 1043b411b363SPhilipp Reisner 1044b411b363SPhilipp Reisner epoch = next_epoch; 1045b411b363SPhilipp Reisner } while (1); 1046b411b363SPhilipp Reisner 1047b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1048b411b363SPhilipp Reisner 1049b411b363SPhilipp Reisner return rv; 1050b411b363SPhilipp Reisner } 1051b411b363SPhilipp Reisner 1052b411b363SPhilipp Reisner /** 1053b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1054b411b363SPhilipp Reisner * @mdev: DRBD device. 1055b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1056b411b363SPhilipp Reisner */ 1057b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1058b411b363SPhilipp Reisner { 1059b411b363SPhilipp Reisner enum write_ordering_e pwo; 1060b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1061b411b363SPhilipp Reisner [WO_none] = "none", 1062b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1063b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1064b411b363SPhilipp Reisner }; 1065b411b363SPhilipp Reisner 1066b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1067b411b363SPhilipp Reisner wo = min(pwo, wo); 1068b411b363SPhilipp Reisner if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) 1069b411b363SPhilipp Reisner wo = WO_drain_io; 1070b411b363SPhilipp Reisner if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) 1071b411b363SPhilipp Reisner wo = WO_none; 1072b411b363SPhilipp Reisner mdev->write_ordering = wo; 10732451fc3bSPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bdev_flush) 1074b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1075b411b363SPhilipp Reisner } 1076b411b363SPhilipp Reisner 1077b411b363SPhilipp Reisner /** 107845bb912bSLars Ellenberg * drbd_submit_ee() 107945bb912bSLars Ellenberg * @mdev: DRBD device. 108045bb912bSLars Ellenberg * @e: epoch entry 108145bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 108210f6d992SLars Ellenberg * 108310f6d992SLars Ellenberg * May spread the pages to multiple bios, 108410f6d992SLars Ellenberg * depending on bio_add_page restrictions. 108510f6d992SLars Ellenberg * 108610f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 108710f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 108810f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 108910f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 109010f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 109110f6d992SLars Ellenberg * on certain Xen deployments. 109245bb912bSLars Ellenberg */ 109345bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 109445bb912bSLars Ellenberg int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, 109545bb912bSLars Ellenberg const unsigned rw, const int fault_type) 109645bb912bSLars Ellenberg { 109745bb912bSLars Ellenberg struct bio *bios = NULL; 109845bb912bSLars Ellenberg struct bio *bio; 109945bb912bSLars Ellenberg struct page *page = e->pages; 110045bb912bSLars Ellenberg sector_t sector = e->sector; 110145bb912bSLars Ellenberg unsigned ds = e->size; 110245bb912bSLars Ellenberg unsigned n_bios = 0; 110345bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 110410f6d992SLars Ellenberg int err = -ENOMEM; 110545bb912bSLars Ellenberg 110645bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 110745bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 110845bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 11099476f39dSLars Ellenberg * request in more than one bio. 11109476f39dSLars Ellenberg * 11119476f39dSLars Ellenberg * Plain bio_alloc is good enough here, this is no DRBD internally 11129476f39dSLars Ellenberg * generated bio, but a bio allocated on behalf of the peer. 11139476f39dSLars Ellenberg */ 111445bb912bSLars Ellenberg next_bio: 111545bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 111645bb912bSLars Ellenberg if (!bio) { 111745bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 111845bb912bSLars Ellenberg goto fail; 111945bb912bSLars Ellenberg } 112045bb912bSLars Ellenberg /* > e->sector, unless this is the first bio */ 112145bb912bSLars Ellenberg bio->bi_sector = sector; 112245bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 112345bb912bSLars Ellenberg bio->bi_rw = rw; 112445bb912bSLars Ellenberg bio->bi_private = e; 112545bb912bSLars Ellenberg bio->bi_end_io = drbd_endio_sec; 112645bb912bSLars Ellenberg 112745bb912bSLars Ellenberg bio->bi_next = bios; 112845bb912bSLars Ellenberg bios = bio; 112945bb912bSLars Ellenberg ++n_bios; 113045bb912bSLars Ellenberg 113145bb912bSLars Ellenberg page_chain_for_each(page) { 113245bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 113345bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 113410f6d992SLars Ellenberg /* A single page must always be possible! 113510f6d992SLars Ellenberg * But in case it fails anyways, 113610f6d992SLars Ellenberg * we deal with it, and complain (below). */ 113710f6d992SLars Ellenberg if (bio->bi_vcnt == 0) { 113810f6d992SLars Ellenberg dev_err(DEV, 113910f6d992SLars Ellenberg "bio_add_page failed for len=%u, " 114010f6d992SLars Ellenberg "bi_vcnt=0 (bi_sector=%llu)\n", 114110f6d992SLars Ellenberg len, (unsigned long long)bio->bi_sector); 114210f6d992SLars Ellenberg err = -ENOSPC; 114310f6d992SLars Ellenberg goto fail; 114410f6d992SLars Ellenberg } 114545bb912bSLars Ellenberg goto next_bio; 114645bb912bSLars Ellenberg } 114745bb912bSLars Ellenberg ds -= len; 114845bb912bSLars Ellenberg sector += len >> 9; 114945bb912bSLars Ellenberg --nr_pages; 115045bb912bSLars Ellenberg } 115145bb912bSLars Ellenberg D_ASSERT(page == NULL); 115245bb912bSLars Ellenberg D_ASSERT(ds == 0); 115345bb912bSLars Ellenberg 115445bb912bSLars Ellenberg atomic_set(&e->pending_bios, n_bios); 115545bb912bSLars Ellenberg do { 115645bb912bSLars Ellenberg bio = bios; 115745bb912bSLars Ellenberg bios = bios->bi_next; 115845bb912bSLars Ellenberg bio->bi_next = NULL; 115945bb912bSLars Ellenberg 116045bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 116145bb912bSLars Ellenberg } while (bios); 116245bb912bSLars Ellenberg return 0; 116345bb912bSLars Ellenberg 116445bb912bSLars Ellenberg fail: 116545bb912bSLars Ellenberg while (bios) { 116645bb912bSLars Ellenberg bio = bios; 116745bb912bSLars Ellenberg bios = bios->bi_next; 116845bb912bSLars Ellenberg bio_put(bio); 116945bb912bSLars Ellenberg } 117010f6d992SLars Ellenberg return err; 117145bb912bSLars Ellenberg } 117245bb912bSLars Ellenberg 117302918be2SPhilipp Reisner static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1174b411b363SPhilipp Reisner { 11752451fc3bSPhilipp Reisner int rv; 117602918be2SPhilipp Reisner struct p_barrier *p = &mdev->data.rbuf.barrier; 1177b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1178b411b363SPhilipp Reisner 1179b411b363SPhilipp Reisner inc_unacked(mdev); 1180b411b363SPhilipp Reisner 1181b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1182b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1183b411b363SPhilipp Reisner 1184b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1185b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1186b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1187b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1188b411b363SPhilipp Reisner * completed. */ 1189b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1190b411b363SPhilipp Reisner case WO_none: 1191b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 119281e84650SAndreas Gruenbacher return true; 1193b411b363SPhilipp Reisner 1194b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1195b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1196b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 11972451fc3bSPhilipp Reisner if (epoch) 11982451fc3bSPhilipp Reisner break; 11992451fc3bSPhilipp Reisner else 1200b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 12012451fc3bSPhilipp Reisner /* Fall through */ 12022451fc3bSPhilipp Reisner 12032451fc3bSPhilipp Reisner case WO_bdev_flush: 12042451fc3bSPhilipp Reisner case WO_drain_io: 1205b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 12062451fc3bSPhilipp Reisner drbd_flush(mdev); 12072451fc3bSPhilipp Reisner 12082451fc3bSPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 12092451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 12102451fc3bSPhilipp Reisner if (epoch) 12112451fc3bSPhilipp Reisner break; 1212b411b363SPhilipp Reisner } 1213b411b363SPhilipp Reisner 12142451fc3bSPhilipp Reisner epoch = mdev->current_epoch; 12152451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 12162451fc3bSPhilipp Reisner 12172451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 12182451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1219b411b363SPhilipp Reisner 122081e84650SAndreas Gruenbacher return true; 12212451fc3bSPhilipp Reisner default: 12222451fc3bSPhilipp Reisner dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); 122381e84650SAndreas Gruenbacher return false; 1224b411b363SPhilipp Reisner } 1225b411b363SPhilipp Reisner 1226b411b363SPhilipp Reisner epoch->flags = 0; 1227b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1228b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1229b411b363SPhilipp Reisner 1230b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1231b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1232b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1233b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1234b411b363SPhilipp Reisner mdev->epochs++; 1235b411b363SPhilipp Reisner } else { 1236b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1237b411b363SPhilipp Reisner kfree(epoch); 1238b411b363SPhilipp Reisner } 1239b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1240b411b363SPhilipp Reisner 124181e84650SAndreas Gruenbacher return true; 1242b411b363SPhilipp Reisner } 1243b411b363SPhilipp Reisner 1244b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1245b411b363SPhilipp Reisner * and from receive_Data */ 1246b411b363SPhilipp Reisner static struct drbd_epoch_entry * 1247b411b363SPhilipp Reisner read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local) 1248b411b363SPhilipp Reisner { 12496666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1250b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1251b411b363SPhilipp Reisner struct page *page; 125245bb912bSLars Ellenberg int dgs, ds, rr; 1253b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1254b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 12556b4388acSPhilipp Reisner unsigned long *data; 1256b411b363SPhilipp Reisner 1257b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1258b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1259b411b363SPhilipp Reisner 1260b411b363SPhilipp Reisner if (dgs) { 1261b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1262b411b363SPhilipp Reisner if (rr != dgs) { 12630ddc5549SLars Ellenberg if (!signal_pending(current)) 12640ddc5549SLars Ellenberg dev_warn(DEV, 12650ddc5549SLars Ellenberg "short read receiving data digest: read %d expected %d\n", 1266b411b363SPhilipp Reisner rr, dgs); 1267b411b363SPhilipp Reisner return NULL; 1268b411b363SPhilipp Reisner } 1269b411b363SPhilipp Reisner } 1270b411b363SPhilipp Reisner 1271b411b363SPhilipp Reisner data_size -= dgs; 1272b411b363SPhilipp Reisner 1273d07c9c10SPhilipp Reisner ERR_IF(data_size == 0) return NULL; 1274b411b363SPhilipp Reisner ERR_IF(data_size & 0x1ff) return NULL; 12751816a2b4SLars Ellenberg ERR_IF(data_size > DRBD_MAX_BIO_SIZE) return NULL; 1276b411b363SPhilipp Reisner 12776666032aSLars Ellenberg /* even though we trust out peer, 12786666032aSLars Ellenberg * we sometimes have to double check. */ 12796666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1280fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1281fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 12826666032aSLars Ellenberg (unsigned long long)capacity, 12836666032aSLars Ellenberg (unsigned long long)sector, data_size); 12846666032aSLars Ellenberg return NULL; 12856666032aSLars Ellenberg } 12866666032aSLars Ellenberg 1287b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1288b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1289b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1290b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); 1291b411b363SPhilipp Reisner if (!e) 1292b411b363SPhilipp Reisner return NULL; 129345bb912bSLars Ellenberg 1294b411b363SPhilipp Reisner ds = data_size; 129545bb912bSLars Ellenberg page = e->pages; 129645bb912bSLars Ellenberg page_chain_for_each(page) { 129745bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 12986b4388acSPhilipp Reisner data = kmap(page); 129945bb912bSLars Ellenberg rr = drbd_recv(mdev, data, len); 13000cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 13016b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 13026b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 13036b4388acSPhilipp Reisner } 1304b411b363SPhilipp Reisner kunmap(page); 130545bb912bSLars Ellenberg if (rr != len) { 1306b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 13070ddc5549SLars Ellenberg if (!signal_pending(current)) 1308b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 130945bb912bSLars Ellenberg rr, len); 1310b411b363SPhilipp Reisner return NULL; 1311b411b363SPhilipp Reisner } 1312b411b363SPhilipp Reisner ds -= rr; 1313b411b363SPhilipp Reisner } 1314b411b363SPhilipp Reisner 1315b411b363SPhilipp Reisner if (dgs) { 131645bb912bSLars Ellenberg drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv); 1317b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1318470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1319470be44aSLars Ellenberg (unsigned long long)sector, data_size); 1320b411b363SPhilipp Reisner drbd_bcast_ee(mdev, "digest failed", 1321b411b363SPhilipp Reisner dgs, dig_in, dig_vv, e); 1322b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1323b411b363SPhilipp Reisner return NULL; 1324b411b363SPhilipp Reisner } 1325b411b363SPhilipp Reisner } 1326b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1327b411b363SPhilipp Reisner return e; 1328b411b363SPhilipp Reisner } 1329b411b363SPhilipp Reisner 1330b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1331b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1332b411b363SPhilipp Reisner */ 1333b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1334b411b363SPhilipp Reisner { 1335b411b363SPhilipp Reisner struct page *page; 1336b411b363SPhilipp Reisner int rr, rv = 1; 1337b411b363SPhilipp Reisner void *data; 1338b411b363SPhilipp Reisner 1339c3470cdeSLars Ellenberg if (!data_size) 134081e84650SAndreas Gruenbacher return true; 1341c3470cdeSLars Ellenberg 134245bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, 1, 1); 1343b411b363SPhilipp Reisner 1344b411b363SPhilipp Reisner data = kmap(page); 1345b411b363SPhilipp Reisner while (data_size) { 1346b411b363SPhilipp Reisner rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); 1347b411b363SPhilipp Reisner if (rr != min_t(int, data_size, PAGE_SIZE)) { 1348b411b363SPhilipp Reisner rv = 0; 13490ddc5549SLars Ellenberg if (!signal_pending(current)) 13500ddc5549SLars Ellenberg dev_warn(DEV, 13510ddc5549SLars Ellenberg "short read receiving data: read %d expected %d\n", 1352b411b363SPhilipp Reisner rr, min_t(int, data_size, PAGE_SIZE)); 1353b411b363SPhilipp Reisner break; 1354b411b363SPhilipp Reisner } 1355b411b363SPhilipp Reisner data_size -= rr; 1356b411b363SPhilipp Reisner } 1357b411b363SPhilipp Reisner kunmap(page); 1358435f0740SLars Ellenberg drbd_pp_free(mdev, page, 0); 1359b411b363SPhilipp Reisner return rv; 1360b411b363SPhilipp Reisner } 1361b411b363SPhilipp Reisner 1362b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1363b411b363SPhilipp Reisner sector_t sector, int data_size) 1364b411b363SPhilipp Reisner { 1365b411b363SPhilipp Reisner struct bio_vec *bvec; 1366b411b363SPhilipp Reisner struct bio *bio; 1367b411b363SPhilipp Reisner int dgs, rr, i, expect; 1368b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1369b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 1370b411b363SPhilipp Reisner 1371b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1372b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1373b411b363SPhilipp Reisner 1374b411b363SPhilipp Reisner if (dgs) { 1375b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1376b411b363SPhilipp Reisner if (rr != dgs) { 13770ddc5549SLars Ellenberg if (!signal_pending(current)) 13780ddc5549SLars Ellenberg dev_warn(DEV, 13790ddc5549SLars Ellenberg "short read receiving data reply digest: read %d expected %d\n", 1380b411b363SPhilipp Reisner rr, dgs); 1381b411b363SPhilipp Reisner return 0; 1382b411b363SPhilipp Reisner } 1383b411b363SPhilipp Reisner } 1384b411b363SPhilipp Reisner 1385b411b363SPhilipp Reisner data_size -= dgs; 1386b411b363SPhilipp Reisner 1387b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1388b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1389b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1390b411b363SPhilipp Reisner 1391b411b363SPhilipp Reisner bio = req->master_bio; 1392b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1393b411b363SPhilipp Reisner 1394b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1395b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1396b411b363SPhilipp Reisner rr = drbd_recv(mdev, 1397b411b363SPhilipp Reisner kmap(bvec->bv_page)+bvec->bv_offset, 1398b411b363SPhilipp Reisner expect); 1399b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1400b411b363SPhilipp Reisner if (rr != expect) { 14010ddc5549SLars Ellenberg if (!signal_pending(current)) 1402b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply: " 1403b411b363SPhilipp Reisner "read %d expected %d\n", 1404b411b363SPhilipp Reisner rr, expect); 1405b411b363SPhilipp Reisner return 0; 1406b411b363SPhilipp Reisner } 1407b411b363SPhilipp Reisner data_size -= rr; 1408b411b363SPhilipp Reisner } 1409b411b363SPhilipp Reisner 1410b411b363SPhilipp Reisner if (dgs) { 141145bb912bSLars Ellenberg drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv); 1412b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1413b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 1414b411b363SPhilipp Reisner return 0; 1415b411b363SPhilipp Reisner } 1416b411b363SPhilipp Reisner } 1417b411b363SPhilipp Reisner 1418b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 1419b411b363SPhilipp Reisner return 1; 1420b411b363SPhilipp Reisner } 1421b411b363SPhilipp Reisner 1422b411b363SPhilipp Reisner /* e_end_resync_block() is called via 1423b411b363SPhilipp Reisner * drbd_process_done_ee() by asender only */ 1424b411b363SPhilipp Reisner static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1425b411b363SPhilipp Reisner { 1426b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1427b411b363SPhilipp Reisner sector_t sector = e->sector; 1428b411b363SPhilipp Reisner int ok; 1429b411b363SPhilipp Reisner 143024c4830cSBart Van Assche D_ASSERT(hlist_unhashed(&e->collision)); 1431b411b363SPhilipp Reisner 143245bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1433b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1434b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e); 1435b411b363SPhilipp Reisner } else { 1436b411b363SPhilipp Reisner /* Record failure to sync */ 1437b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, e->size); 1438b411b363SPhilipp Reisner 1439b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1440b411b363SPhilipp Reisner } 1441b411b363SPhilipp Reisner dec_unacked(mdev); 1442b411b363SPhilipp Reisner 1443b411b363SPhilipp Reisner return ok; 1444b411b363SPhilipp Reisner } 1445b411b363SPhilipp Reisner 1446b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1447b411b363SPhilipp Reisner { 1448b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1449b411b363SPhilipp Reisner 1450b411b363SPhilipp Reisner e = read_in_block(mdev, ID_SYNCER, sector, data_size); 145145bb912bSLars Ellenberg if (!e) 145245bb912bSLars Ellenberg goto fail; 1453b411b363SPhilipp Reisner 1454b411b363SPhilipp Reisner dec_rs_pending(mdev); 1455b411b363SPhilipp Reisner 1456b411b363SPhilipp Reisner inc_unacked(mdev); 1457b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1458b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1459b411b363SPhilipp Reisner 146045bb912bSLars Ellenberg e->w.cb = e_end_resync_block; 146145bb912bSLars Ellenberg 1462b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1463b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->sync_ee); 1464b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1465b411b363SPhilipp Reisner 14660f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 146745bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0) 146881e84650SAndreas Gruenbacher return true; 146945bb912bSLars Ellenberg 147010f6d992SLars Ellenberg /* don't care for the reason here */ 147110f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 147222cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 147322cc37a9SLars Ellenberg list_del(&e->w.list); 147422cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 147522cc37a9SLars Ellenberg 147645bb912bSLars Ellenberg drbd_free_ee(mdev, e); 147745bb912bSLars Ellenberg fail: 147845bb912bSLars Ellenberg put_ldev(mdev); 147981e84650SAndreas Gruenbacher return false; 1480b411b363SPhilipp Reisner } 1481b411b363SPhilipp Reisner 148202918be2SPhilipp Reisner static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1483b411b363SPhilipp Reisner { 1484b411b363SPhilipp Reisner struct drbd_request *req; 1485b411b363SPhilipp Reisner sector_t sector; 1486b411b363SPhilipp Reisner int ok; 148702918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1488b411b363SPhilipp Reisner 1489b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1490b411b363SPhilipp Reisner 1491b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1492b411b363SPhilipp Reisner req = _ar_id_to_req(mdev, p->block_id, sector); 1493b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1494b411b363SPhilipp Reisner if (unlikely(!req)) { 1495b411b363SPhilipp Reisner dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n"); 149681e84650SAndreas Gruenbacher return false; 1497b411b363SPhilipp Reisner } 1498b411b363SPhilipp Reisner 149924c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1500b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1501b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1502b411b363SPhilipp Reisner ok = recv_dless_read(mdev, req, sector, data_size); 1503b411b363SPhilipp Reisner 1504b411b363SPhilipp Reisner if (ok) 1505b411b363SPhilipp Reisner req_mod(req, data_received); 1506b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1507b411b363SPhilipp Reisner * I don't think we may complete this just yet 1508b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1509b411b363SPhilipp Reisner 1510b411b363SPhilipp Reisner return ok; 1511b411b363SPhilipp Reisner } 1512b411b363SPhilipp Reisner 151302918be2SPhilipp Reisner static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1514b411b363SPhilipp Reisner { 1515b411b363SPhilipp Reisner sector_t sector; 1516b411b363SPhilipp Reisner int ok; 151702918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1518b411b363SPhilipp Reisner 1519b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1520b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1521b411b363SPhilipp Reisner 1522b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1523b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1524b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1525b411b363SPhilipp Reisner * or in drbd_endio_write_sec. */ 1526b411b363SPhilipp Reisner ok = recv_resync_read(mdev, sector, data_size); 1527b411b363SPhilipp Reisner } else { 1528b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1529b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1530b411b363SPhilipp Reisner 1531b411b363SPhilipp Reisner ok = drbd_drain_block(mdev, data_size); 1532b411b363SPhilipp Reisner 15332b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1534b411b363SPhilipp Reisner } 1535b411b363SPhilipp Reisner 1536778f271dSPhilipp Reisner atomic_add(data_size >> 9, &mdev->rs_sect_in); 1537778f271dSPhilipp Reisner 1538b411b363SPhilipp Reisner return ok; 1539b411b363SPhilipp Reisner } 1540b411b363SPhilipp Reisner 1541b411b363SPhilipp Reisner /* e_end_block() is called via drbd_process_done_ee(). 1542b411b363SPhilipp Reisner * this means this function only runs in the asender thread 1543b411b363SPhilipp Reisner */ 1544b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1545b411b363SPhilipp Reisner { 1546b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1547b411b363SPhilipp Reisner sector_t sector = e->sector; 1548b411b363SPhilipp Reisner int ok = 1, pcmd; 1549b411b363SPhilipp Reisner 1550b411b363SPhilipp Reisner if (mdev->net_conf->wire_protocol == DRBD_PROT_C) { 155145bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1552b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1553b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1554b411b363SPhilipp Reisner e->flags & EE_MAY_SET_IN_SYNC) ? 1555b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 1556b411b363SPhilipp Reisner ok &= drbd_send_ack(mdev, pcmd, e); 1557b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1558b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1559b411b363SPhilipp Reisner } else { 1560b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1561b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1562b411b363SPhilipp Reisner * maybe assert this? */ 1563b411b363SPhilipp Reisner } 1564b411b363SPhilipp Reisner dec_unacked(mdev); 1565b411b363SPhilipp Reisner } 1566b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1567b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 1568b411b363SPhilipp Reisner if (mdev->net_conf->two_primaries) { 1569b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 157024c4830cSBart Van Assche D_ASSERT(!hlist_unhashed(&e->collision)); 157124c4830cSBart Van Assche hlist_del_init(&e->collision); 1572b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1573b411b363SPhilipp Reisner } else { 157424c4830cSBart Van Assche D_ASSERT(hlist_unhashed(&e->collision)); 1575b411b363SPhilipp Reisner } 1576b411b363SPhilipp Reisner 1577b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1578b411b363SPhilipp Reisner 1579b411b363SPhilipp Reisner return ok; 1580b411b363SPhilipp Reisner } 1581b411b363SPhilipp Reisner 1582b411b363SPhilipp Reisner static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1583b411b363SPhilipp Reisner { 1584b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1585b411b363SPhilipp Reisner int ok = 1; 1586b411b363SPhilipp Reisner 1587b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1588b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_DISCARD_ACK, e); 1589b411b363SPhilipp Reisner 1590b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 159124c4830cSBart Van Assche D_ASSERT(!hlist_unhashed(&e->collision)); 159224c4830cSBart Van Assche hlist_del_init(&e->collision); 1593b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1594b411b363SPhilipp Reisner 1595b411b363SPhilipp Reisner dec_unacked(mdev); 1596b411b363SPhilipp Reisner 1597b411b363SPhilipp Reisner return ok; 1598b411b363SPhilipp Reisner } 1599b411b363SPhilipp Reisner 1600b6a370baSPhilipp Reisner static bool overlapping_resync_write(struct drbd_conf *mdev, struct drbd_epoch_entry *data_e) 1601b6a370baSPhilipp Reisner { 1602b6a370baSPhilipp Reisner 1603b6a370baSPhilipp Reisner struct drbd_epoch_entry *rs_e; 1604b6a370baSPhilipp Reisner bool rv = 0; 1605b6a370baSPhilipp Reisner 1606b6a370baSPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1607b6a370baSPhilipp Reisner list_for_each_entry(rs_e, &mdev->sync_ee, w.list) { 1608b6a370baSPhilipp Reisner if (overlaps(data_e->sector, data_e->size, rs_e->sector, rs_e->size)) { 1609b6a370baSPhilipp Reisner rv = 1; 1610b6a370baSPhilipp Reisner break; 1611b6a370baSPhilipp Reisner } 1612b6a370baSPhilipp Reisner } 1613b6a370baSPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1614b6a370baSPhilipp Reisner 1615b6a370baSPhilipp Reisner return rv; 1616b6a370baSPhilipp Reisner } 1617b6a370baSPhilipp Reisner 1618b411b363SPhilipp Reisner /* Called from receive_Data. 1619b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1620b411b363SPhilipp Reisner * 1621b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1622b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1623b411b363SPhilipp Reisner * been sent. 1624b411b363SPhilipp Reisner * 1625b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1626b411b363SPhilipp Reisner * 1627b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1628b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1629b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1630b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1631b411b363SPhilipp Reisner * 1632b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1633b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1634b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1635b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1636b411b363SPhilipp Reisner * 1637b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1638b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 1639b411b363SPhilipp Reisner static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) 1640b411b363SPhilipp Reisner { 1641b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1642b411b363SPhilipp Reisner unsigned int p_seq; 1643b411b363SPhilipp Reisner long timeout; 1644b411b363SPhilipp Reisner int ret = 0; 1645b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1646b411b363SPhilipp Reisner for (;;) { 1647b411b363SPhilipp Reisner prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1648b411b363SPhilipp Reisner if (seq_le(packet_seq, mdev->peer_seq+1)) 1649b411b363SPhilipp Reisner break; 1650b411b363SPhilipp Reisner if (signal_pending(current)) { 1651b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1652b411b363SPhilipp Reisner break; 1653b411b363SPhilipp Reisner } 1654b411b363SPhilipp Reisner p_seq = mdev->peer_seq; 1655b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1656b411b363SPhilipp Reisner timeout = schedule_timeout(30*HZ); 1657b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1658b411b363SPhilipp Reisner if (timeout == 0 && p_seq == mdev->peer_seq) { 1659b411b363SPhilipp Reisner ret = -ETIMEDOUT; 1660b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); 1661b411b363SPhilipp Reisner break; 1662b411b363SPhilipp Reisner } 1663b411b363SPhilipp Reisner } 1664b411b363SPhilipp Reisner finish_wait(&mdev->seq_wait, &wait); 1665b411b363SPhilipp Reisner if (mdev->peer_seq+1 == packet_seq) 1666b411b363SPhilipp Reisner mdev->peer_seq++; 1667b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1668b411b363SPhilipp Reisner return ret; 1669b411b363SPhilipp Reisner } 1670b411b363SPhilipp Reisner 1671688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1672688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1673688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1674688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 167576d2e7ecSPhilipp Reisner { 167676d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 167776d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1678688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 167976d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 168076d2e7ecSPhilipp Reisner } 168176d2e7ecSPhilipp Reisner 1682b411b363SPhilipp Reisner /* mirrored write */ 168302918be2SPhilipp Reisner static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1684b411b363SPhilipp Reisner { 1685b411b363SPhilipp Reisner sector_t sector; 1686b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 168702918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1688b411b363SPhilipp Reisner int rw = WRITE; 1689b411b363SPhilipp Reisner u32 dp_flags; 1690b411b363SPhilipp Reisner 1691b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 1692b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1693b411b363SPhilipp Reisner if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) 1694b411b363SPhilipp Reisner mdev->peer_seq++; 1695b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1696b411b363SPhilipp Reisner 16972b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1698b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 1699b411b363SPhilipp Reisner return drbd_drain_block(mdev, data_size); 1700b411b363SPhilipp Reisner } 1701b411b363SPhilipp Reisner 1702b411b363SPhilipp Reisner /* get_ldev(mdev) successful. 1703b411b363SPhilipp Reisner * Corresponding put_ldev done either below (on various errors), 1704b411b363SPhilipp Reisner * or in drbd_endio_write_sec, if we successfully submit the data at 1705b411b363SPhilipp Reisner * the end of this function. */ 1706b411b363SPhilipp Reisner 1707b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1708b411b363SPhilipp Reisner e = read_in_block(mdev, p->block_id, sector, data_size); 1709b411b363SPhilipp Reisner if (!e) { 1710b411b363SPhilipp Reisner put_ldev(mdev); 171181e84650SAndreas Gruenbacher return false; 1712b411b363SPhilipp Reisner } 1713b411b363SPhilipp Reisner 1714b411b363SPhilipp Reisner e->w.cb = e_end_block; 1715b411b363SPhilipp Reisner 1716688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 1717688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 1718688593c5SLars Ellenberg 1719688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 1720688593c5SLars Ellenberg e->flags |= EE_MAY_SET_IN_SYNC; 1721688593c5SLars Ellenberg 1722b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1723b411b363SPhilipp Reisner e->epoch = mdev->current_epoch; 1724b411b363SPhilipp Reisner atomic_inc(&e->epoch->epoch_size); 1725b411b363SPhilipp Reisner atomic_inc(&e->epoch->active); 1726b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1727b411b363SPhilipp Reisner 1728b411b363SPhilipp Reisner /* I'm the receiver, I do hold a net_cnt reference. */ 1729b411b363SPhilipp Reisner if (!mdev->net_conf->two_primaries) { 1730b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1731b411b363SPhilipp Reisner } else { 1732b411b363SPhilipp Reisner /* don't get the req_lock yet, 1733b411b363SPhilipp Reisner * we may sleep in drbd_wait_peer_seq */ 1734b411b363SPhilipp Reisner const int size = e->size; 1735b411b363SPhilipp Reisner const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1736b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1737b411b363SPhilipp Reisner struct drbd_request *i; 1738b411b363SPhilipp Reisner struct hlist_node *n; 1739b411b363SPhilipp Reisner struct hlist_head *slot; 1740b411b363SPhilipp Reisner int first; 1741b411b363SPhilipp Reisner 1742b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1743b411b363SPhilipp Reisner BUG_ON(mdev->ee_hash == NULL); 1744b411b363SPhilipp Reisner BUG_ON(mdev->tl_hash == NULL); 1745b411b363SPhilipp Reisner 1746b411b363SPhilipp Reisner /* conflict detection and handling: 1747b411b363SPhilipp Reisner * 1. wait on the sequence number, 1748b411b363SPhilipp Reisner * in case this data packet overtook ACK packets. 1749b411b363SPhilipp Reisner * 2. check our hash tables for conflicting requests. 1750b411b363SPhilipp Reisner * we only need to walk the tl_hash, since an ee can not 1751b411b363SPhilipp Reisner * have a conflict with an other ee: on the submitting 1752b411b363SPhilipp Reisner * node, the corresponding req had already been conflicting, 1753b411b363SPhilipp Reisner * and a conflicting req is never sent. 1754b411b363SPhilipp Reisner * 1755b411b363SPhilipp Reisner * Note: for two_primaries, we are protocol C, 1756b411b363SPhilipp Reisner * so there cannot be any request that is DONE 1757b411b363SPhilipp Reisner * but still on the transfer log. 1758b411b363SPhilipp Reisner * 1759b411b363SPhilipp Reisner * unconditionally add to the ee_hash. 1760b411b363SPhilipp Reisner * 1761b411b363SPhilipp Reisner * if no conflicting request is found: 1762b411b363SPhilipp Reisner * submit. 1763b411b363SPhilipp Reisner * 1764b411b363SPhilipp Reisner * if any conflicting request is found 1765b411b363SPhilipp Reisner * that has not yet been acked, 1766b411b363SPhilipp Reisner * AND I have the "discard concurrent writes" flag: 1767b411b363SPhilipp Reisner * queue (via done_ee) the P_DISCARD_ACK; OUT. 1768b411b363SPhilipp Reisner * 1769b411b363SPhilipp Reisner * if any conflicting request is found: 1770b411b363SPhilipp Reisner * block the receiver, waiting on misc_wait 1771b411b363SPhilipp Reisner * until no more conflicting requests are there, 1772b411b363SPhilipp Reisner * or we get interrupted (disconnect). 1773b411b363SPhilipp Reisner * 1774b411b363SPhilipp Reisner * we do not just write after local io completion of those 1775b411b363SPhilipp Reisner * requests, but only after req is done completely, i.e. 1776b411b363SPhilipp Reisner * we wait for the P_DISCARD_ACK to arrive! 1777b411b363SPhilipp Reisner * 1778b411b363SPhilipp Reisner * then proceed normally, i.e. submit. 1779b411b363SPhilipp Reisner */ 1780b411b363SPhilipp Reisner if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) 1781b411b363SPhilipp Reisner goto out_interrupted; 1782b411b363SPhilipp Reisner 1783b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1784b411b363SPhilipp Reisner 178524c4830cSBart Van Assche hlist_add_head(&e->collision, ee_hash_slot(mdev, sector)); 1786b411b363SPhilipp Reisner 1787b411b363SPhilipp Reisner #define OVERLAPS overlaps(i->sector, i->size, sector, size) 1788b411b363SPhilipp Reisner slot = tl_hash_slot(mdev, sector); 1789b411b363SPhilipp Reisner first = 1; 1790b411b363SPhilipp Reisner for (;;) { 1791b411b363SPhilipp Reisner int have_unacked = 0; 1792b411b363SPhilipp Reisner int have_conflict = 0; 1793b411b363SPhilipp Reisner prepare_to_wait(&mdev->misc_wait, &wait, 1794b411b363SPhilipp Reisner TASK_INTERRUPTIBLE); 179524c4830cSBart Van Assche hlist_for_each_entry(i, n, slot, collision) { 1796b411b363SPhilipp Reisner if (OVERLAPS) { 1797b411b363SPhilipp Reisner /* only ALERT on first iteration, 1798b411b363SPhilipp Reisner * we may be woken up early... */ 1799b411b363SPhilipp Reisner if (first) 1800b411b363SPhilipp Reisner dev_alert(DEV, "%s[%u] Concurrent local write detected!" 1801b411b363SPhilipp Reisner " new: %llus +%u; pending: %llus +%u\n", 1802b411b363SPhilipp Reisner current->comm, current->pid, 1803b411b363SPhilipp Reisner (unsigned long long)sector, size, 1804b411b363SPhilipp Reisner (unsigned long long)i->sector, i->size); 1805b411b363SPhilipp Reisner if (i->rq_state & RQ_NET_PENDING) 1806b411b363SPhilipp Reisner ++have_unacked; 1807b411b363SPhilipp Reisner ++have_conflict; 1808b411b363SPhilipp Reisner } 1809b411b363SPhilipp Reisner } 1810b411b363SPhilipp Reisner #undef OVERLAPS 1811b411b363SPhilipp Reisner if (!have_conflict) 1812b411b363SPhilipp Reisner break; 1813b411b363SPhilipp Reisner 1814b411b363SPhilipp Reisner /* Discard Ack only for the _first_ iteration */ 1815b411b363SPhilipp Reisner if (first && discard && have_unacked) { 1816b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", 1817b411b363SPhilipp Reisner (unsigned long long)sector); 1818b411b363SPhilipp Reisner inc_unacked(mdev); 1819b411b363SPhilipp Reisner e->w.cb = e_send_discard_ack; 1820b411b363SPhilipp Reisner list_add_tail(&e->w.list, &mdev->done_ee); 1821b411b363SPhilipp Reisner 1822b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1823b411b363SPhilipp Reisner 1824b411b363SPhilipp Reisner /* we could probably send that P_DISCARD_ACK ourselves, 1825b411b363SPhilipp Reisner * but I don't like the receiver using the msock */ 1826b411b363SPhilipp Reisner 1827b411b363SPhilipp Reisner put_ldev(mdev); 1828b411b363SPhilipp Reisner wake_asender(mdev); 1829b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 183081e84650SAndreas Gruenbacher return true; 1831b411b363SPhilipp Reisner } 1832b411b363SPhilipp Reisner 1833b411b363SPhilipp Reisner if (signal_pending(current)) { 183424c4830cSBart Van Assche hlist_del_init(&e->collision); 1835b411b363SPhilipp Reisner 1836b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1837b411b363SPhilipp Reisner 1838b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1839b411b363SPhilipp Reisner goto out_interrupted; 1840b411b363SPhilipp Reisner } 1841b411b363SPhilipp Reisner 1842b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1843b411b363SPhilipp Reisner if (first) { 1844b411b363SPhilipp Reisner first = 0; 1845b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " 1846b411b363SPhilipp Reisner "sec=%llus\n", (unsigned long long)sector); 1847b411b363SPhilipp Reisner } else if (discard) { 1848b411b363SPhilipp Reisner /* we had none on the first iteration. 1849b411b363SPhilipp Reisner * there must be none now. */ 1850b411b363SPhilipp Reisner D_ASSERT(have_unacked == 0); 1851b411b363SPhilipp Reisner } 1852b411b363SPhilipp Reisner schedule(); 1853b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1854b411b363SPhilipp Reisner } 1855b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1856b411b363SPhilipp Reisner } 1857b411b363SPhilipp Reisner 1858b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->active_ee); 1859b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1860b411b363SPhilipp Reisner 1861b6a370baSPhilipp Reisner if (mdev->state.conn == C_SYNC_TARGET) 1862b6a370baSPhilipp Reisner wait_event(mdev->ee_wait, !overlapping_resync_write(mdev, e)); 1863b6a370baSPhilipp Reisner 1864b411b363SPhilipp Reisner switch (mdev->net_conf->wire_protocol) { 1865b411b363SPhilipp Reisner case DRBD_PROT_C: 1866b411b363SPhilipp Reisner inc_unacked(mdev); 1867b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 1868b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1869b411b363SPhilipp Reisner break; 1870b411b363SPhilipp Reisner case DRBD_PROT_B: 1871b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 1872b411b363SPhilipp Reisner * sends on the msock, but anyways */ 1873b411b363SPhilipp Reisner drbd_send_ack(mdev, P_RECV_ACK, e); 1874b411b363SPhilipp Reisner break; 1875b411b363SPhilipp Reisner case DRBD_PROT_A: 1876b411b363SPhilipp Reisner /* nothing to do */ 1877b411b363SPhilipp Reisner break; 1878b411b363SPhilipp Reisner } 1879b411b363SPhilipp Reisner 18806719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 1881b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 1882b411b363SPhilipp Reisner drbd_set_out_of_sync(mdev, e->sector, e->size); 1883b411b363SPhilipp Reisner e->flags |= EE_CALL_AL_COMPLETE_IO; 18846719fb03SLars Ellenberg e->flags &= ~EE_MAY_SET_IN_SYNC; 1885b411b363SPhilipp Reisner drbd_al_begin_io(mdev, e->sector); 1886b411b363SPhilipp Reisner } 1887b411b363SPhilipp Reisner 188845bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0) 188981e84650SAndreas Gruenbacher return true; 1890b411b363SPhilipp Reisner 189110f6d992SLars Ellenberg /* don't care for the reason here */ 189210f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 189322cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 189422cc37a9SLars Ellenberg list_del(&e->w.list); 189524c4830cSBart Van Assche hlist_del_init(&e->collision); 189622cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 189722cc37a9SLars Ellenberg if (e->flags & EE_CALL_AL_COMPLETE_IO) 189822cc37a9SLars Ellenberg drbd_al_complete_io(mdev, e->sector); 189922cc37a9SLars Ellenberg 1900b411b363SPhilipp Reisner out_interrupted: 190110f6d992SLars Ellenberg drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + EV_CLEANUP); 1902b411b363SPhilipp Reisner put_ldev(mdev); 1903b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 190481e84650SAndreas Gruenbacher return false; 1905b411b363SPhilipp Reisner } 1906b411b363SPhilipp Reisner 19070f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 19080f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 19090f0601f4SLars Ellenberg * 19100f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 19110f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 19120f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 19130f0601f4SLars Ellenberg * activity, it obviously is "busy". 19140f0601f4SLars Ellenberg * 19150f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 19160f0601f4SLars Ellenberg * to have a short time average so we can react faster. 19170f0601f4SLars Ellenberg */ 1918e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 19190f0601f4SLars Ellenberg { 19200f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 19210f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 1922e3555d85SPhilipp Reisner struct lc_element *tmp; 19230f0601f4SLars Ellenberg int curr_events; 19240f0601f4SLars Ellenberg int throttle = 0; 19250f0601f4SLars Ellenberg 19260f0601f4SLars Ellenberg /* feature disabled? */ 19270f0601f4SLars Ellenberg if (mdev->sync_conf.c_min_rate == 0) 19280f0601f4SLars Ellenberg return 0; 19290f0601f4SLars Ellenberg 1930e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 1931e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 1932e3555d85SPhilipp Reisner if (tmp) { 1933e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 1934e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 1935e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1936e3555d85SPhilipp Reisner return 0; 1937e3555d85SPhilipp Reisner } 1938e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 1939e3555d85SPhilipp Reisner } 1940e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1941e3555d85SPhilipp Reisner 19420f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 19430f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 19440f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 1945e3555d85SPhilipp Reisner 19460f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 19470f0601f4SLars Ellenberg unsigned long rs_left; 19480f0601f4SLars Ellenberg int i; 19490f0601f4SLars Ellenberg 19500f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 19510f0601f4SLars Ellenberg 19520f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 19530f0601f4SLars Ellenberg * approx. */ 19542649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 19552649f080SLars Ellenberg 19562649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 19572649f080SLars Ellenberg rs_left = mdev->ov_left; 19582649f080SLars Ellenberg else 19590f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 19600f0601f4SLars Ellenberg 19610f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 19620f0601f4SLars Ellenberg if (!dt) 19630f0601f4SLars Ellenberg dt++; 19640f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 19650f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 19660f0601f4SLars Ellenberg 19670f0601f4SLars Ellenberg if (dbdt > mdev->sync_conf.c_min_rate) 19680f0601f4SLars Ellenberg throttle = 1; 19690f0601f4SLars Ellenberg } 19700f0601f4SLars Ellenberg return throttle; 19710f0601f4SLars Ellenberg } 19720f0601f4SLars Ellenberg 19730f0601f4SLars Ellenberg 197402918be2SPhilipp Reisner static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int digest_size) 1975b411b363SPhilipp Reisner { 1976b411b363SPhilipp Reisner sector_t sector; 1977b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1978b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1979b411b363SPhilipp Reisner struct digest_info *di = NULL; 1980b18b37beSPhilipp Reisner int size, verb; 1981b411b363SPhilipp Reisner unsigned int fault_type; 198202918be2SPhilipp Reisner struct p_block_req *p = &mdev->data.rbuf.block_req; 1983b411b363SPhilipp Reisner 1984b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1985b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 1986b411b363SPhilipp Reisner 19871816a2b4SLars Ellenberg if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) { 1988b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 1989b411b363SPhilipp Reisner (unsigned long long)sector, size); 199081e84650SAndreas Gruenbacher return false; 1991b411b363SPhilipp Reisner } 1992b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 1993b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 1994b411b363SPhilipp Reisner (unsigned long long)sector, size); 199581e84650SAndreas Gruenbacher return false; 1996b411b363SPhilipp Reisner } 1997b411b363SPhilipp Reisner 1998b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 1999b18b37beSPhilipp Reisner verb = 1; 2000b18b37beSPhilipp Reisner switch (cmd) { 2001b18b37beSPhilipp Reisner case P_DATA_REQUEST: 2002b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 2003b18b37beSPhilipp Reisner break; 2004b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2005b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2006b18b37beSPhilipp Reisner case P_OV_REQUEST: 2007b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 2008b18b37beSPhilipp Reisner break; 2009b18b37beSPhilipp Reisner case P_OV_REPLY: 2010b18b37beSPhilipp Reisner verb = 0; 2011b18b37beSPhilipp Reisner dec_rs_pending(mdev); 2012b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 2013b18b37beSPhilipp Reisner break; 2014b18b37beSPhilipp Reisner default: 2015b18b37beSPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 2016b18b37beSPhilipp Reisner cmdname(cmd)); 2017b18b37beSPhilipp Reisner } 2018b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2019b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2020b411b363SPhilipp Reisner "no local data.\n"); 2021b18b37beSPhilipp Reisner 2022a821cc4aSLars Ellenberg /* drain possibly payload */ 2023a821cc4aSLars Ellenberg return drbd_drain_block(mdev, digest_size); 2024b411b363SPhilipp Reisner } 2025b411b363SPhilipp Reisner 2026b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2027b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2028b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 2029b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); 2030b411b363SPhilipp Reisner if (!e) { 2031b411b363SPhilipp Reisner put_ldev(mdev); 203281e84650SAndreas Gruenbacher return false; 2033b411b363SPhilipp Reisner } 2034b411b363SPhilipp Reisner 203502918be2SPhilipp Reisner switch (cmd) { 2036b411b363SPhilipp Reisner case P_DATA_REQUEST: 2037b411b363SPhilipp Reisner e->w.cb = w_e_end_data_req; 2038b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 203980a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 204080a40e43SLars Ellenberg goto submit; 204180a40e43SLars Ellenberg 2042b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2043b411b363SPhilipp Reisner e->w.cb = w_e_end_rsdata_req; 2044b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 20455f9915bbSLars Ellenberg /* used in the sector offset progress display */ 20465f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2047b411b363SPhilipp Reisner break; 2048b411b363SPhilipp Reisner 2049b411b363SPhilipp Reisner case P_OV_REPLY: 2050b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2051b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2052b411b363SPhilipp Reisner di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); 2053b411b363SPhilipp Reisner if (!di) 2054b411b363SPhilipp Reisner goto out_free_e; 2055b411b363SPhilipp Reisner 2056b411b363SPhilipp Reisner di->digest_size = digest_size; 2057b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2058b411b363SPhilipp Reisner 2059c36c3cedSLars Ellenberg e->digest = di; 2060c36c3cedSLars Ellenberg e->flags |= EE_HAS_DIGEST; 2061c36c3cedSLars Ellenberg 2062b411b363SPhilipp Reisner if (drbd_recv(mdev, di->digest, digest_size) != digest_size) 2063b411b363SPhilipp Reisner goto out_free_e; 2064b411b363SPhilipp Reisner 206502918be2SPhilipp Reisner if (cmd == P_CSUM_RS_REQUEST) { 2066b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 2067b411b363SPhilipp Reisner e->w.cb = w_e_end_csum_rs_req; 20685f9915bbSLars Ellenberg /* used in the sector offset progress display */ 20695f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 207002918be2SPhilipp Reisner } else if (cmd == P_OV_REPLY) { 20712649f080SLars Ellenberg /* track progress, we may need to throttle */ 20722649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2073b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_reply; 2074b411b363SPhilipp Reisner dec_rs_pending(mdev); 20750f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 20760f0601f4SLars Ellenberg * but accounting still needs to be done. */ 20770f0601f4SLars Ellenberg goto submit_for_resync; 2078b411b363SPhilipp Reisner } 2079b411b363SPhilipp Reisner break; 2080b411b363SPhilipp Reisner 2081b411b363SPhilipp Reisner case P_OV_REQUEST: 2082b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 2083b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90) { 2084de228bbaSLars Ellenberg unsigned long now = jiffies; 2085de228bbaSLars Ellenberg int i; 2086b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2087b411b363SPhilipp Reisner mdev->ov_position = sector; 208830b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 208930b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2090de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2091de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2092de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2093de228bbaSLars Ellenberg } 2094b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2095b411b363SPhilipp Reisner (unsigned long long)sector); 2096b411b363SPhilipp Reisner } 2097b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_req; 2098b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2099b411b363SPhilipp Reisner break; 2100b411b363SPhilipp Reisner 2101b411b363SPhilipp Reisner default: 2102b411b363SPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 210302918be2SPhilipp Reisner cmdname(cmd)); 2104b411b363SPhilipp Reisner fault_type = DRBD_FAULT_MAX; 210580a40e43SLars Ellenberg goto out_free_e; 2106b411b363SPhilipp Reisner } 2107b411b363SPhilipp Reisner 21080f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 21090f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 21100f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 21110f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 21120f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 21130f0601f4SLars Ellenberg * 21140f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 21150f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 21160f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 21170f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 21180f0601f4SLars Ellenberg * a while, anyways. 21190f0601f4SLars Ellenberg */ 2120b411b363SPhilipp Reisner 21210f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 21220f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 21230f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 21240f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 21250f0601f4SLars Ellenberg * 21260f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 21270f0601f4SLars Ellenberg * we would also throttle its application reads. 21280f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 21290f0601f4SLars Ellenberg */ 2130e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2131e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2132e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 213380a40e43SLars Ellenberg goto out_free_e; 2134b411b363SPhilipp Reisner 21350f0601f4SLars Ellenberg submit_for_resync: 21360f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 21370f0601f4SLars Ellenberg 213880a40e43SLars Ellenberg submit: 2139b411b363SPhilipp Reisner inc_unacked(mdev); 214080a40e43SLars Ellenberg spin_lock_irq(&mdev->req_lock); 214180a40e43SLars Ellenberg list_add_tail(&e->w.list, &mdev->read_ee); 214280a40e43SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 2143b411b363SPhilipp Reisner 214445bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, READ, fault_type) == 0) 214581e84650SAndreas Gruenbacher return true; 2146b411b363SPhilipp Reisner 214710f6d992SLars Ellenberg /* don't care for the reason here */ 214810f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 214922cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 215022cc37a9SLars Ellenberg list_del(&e->w.list); 215122cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 215222cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 215322cc37a9SLars Ellenberg 2154b411b363SPhilipp Reisner out_free_e: 2155b411b363SPhilipp Reisner put_ldev(mdev); 2156b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 215781e84650SAndreas Gruenbacher return false; 2158b411b363SPhilipp Reisner } 2159b411b363SPhilipp Reisner 2160b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2161b411b363SPhilipp Reisner { 2162b411b363SPhilipp Reisner int self, peer, rv = -100; 2163b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 2164b411b363SPhilipp Reisner 2165b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2166b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2167b411b363SPhilipp Reisner 2168b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2169b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2170b411b363SPhilipp Reisner 2171b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_0p) { 2172b411b363SPhilipp Reisner case ASB_CONSENSUS: 2173b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2174b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2175b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2176b411b363SPhilipp Reisner break; 2177b411b363SPhilipp Reisner case ASB_DISCONNECT: 2178b411b363SPhilipp Reisner break; 2179b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2180b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2181b411b363SPhilipp Reisner rv = -1; 2182b411b363SPhilipp Reisner break; 2183b411b363SPhilipp Reisner } 2184b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2185b411b363SPhilipp Reisner rv = 1; 2186b411b363SPhilipp Reisner break; 2187b411b363SPhilipp Reisner } 2188b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2189b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2190b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2191b411b363SPhilipp Reisner rv = 1; 2192b411b363SPhilipp Reisner break; 2193b411b363SPhilipp Reisner } 2194b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2195b411b363SPhilipp Reisner rv = -1; 2196b411b363SPhilipp Reisner break; 2197b411b363SPhilipp Reisner } 2198b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2199ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2200b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2201b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2202b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 2203b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2204b411b363SPhilipp Reisner ? -1 : 1; 2205b411b363SPhilipp Reisner break; 2206b411b363SPhilipp Reisner } else { 2207b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2208b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2209b411b363SPhilipp Reisner } 2210b411b363SPhilipp Reisner if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) 2211b411b363SPhilipp Reisner break; 2212b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2213b411b363SPhilipp Reisner if (ch_self < ch_peer) 2214b411b363SPhilipp Reisner rv = -1; 2215b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2216b411b363SPhilipp Reisner rv = 1; 2217b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2218b411b363SPhilipp Reisner /* Well, then use something else. */ 2219b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2220b411b363SPhilipp Reisner ? -1 : 1; 2221b411b363SPhilipp Reisner break; 2222b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2223b411b363SPhilipp Reisner rv = -1; 2224b411b363SPhilipp Reisner break; 2225b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2226b411b363SPhilipp Reisner rv = 1; 2227b411b363SPhilipp Reisner } 2228b411b363SPhilipp Reisner 2229b411b363SPhilipp Reisner return rv; 2230b411b363SPhilipp Reisner } 2231b411b363SPhilipp Reisner 2232b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2233b411b363SPhilipp Reisner { 22346184ea21SAndreas Gruenbacher int hg, rv = -100; 2235b411b363SPhilipp Reisner 2236b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_1p) { 2237b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2238b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2239b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2240b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2241b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2242b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2243b411b363SPhilipp Reisner break; 2244b411b363SPhilipp Reisner case ASB_DISCONNECT: 2245b411b363SPhilipp Reisner break; 2246b411b363SPhilipp Reisner case ASB_CONSENSUS: 2247b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2248b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2249b411b363SPhilipp Reisner rv = hg; 2250b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2251b411b363SPhilipp Reisner rv = hg; 2252b411b363SPhilipp Reisner break; 2253b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2254b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2255b411b363SPhilipp Reisner break; 2256b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2257b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2258b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2259b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2260b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2261bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2262bb437946SAndreas Gruenbacher 2263bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2264b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2265b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2266b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2267bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2268bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2269b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2270b411b363SPhilipp Reisner } else { 2271b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2272b411b363SPhilipp Reisner rv = hg; 2273b411b363SPhilipp Reisner } 2274b411b363SPhilipp Reisner } else 2275b411b363SPhilipp Reisner rv = hg; 2276b411b363SPhilipp Reisner } 2277b411b363SPhilipp Reisner 2278b411b363SPhilipp Reisner return rv; 2279b411b363SPhilipp Reisner } 2280b411b363SPhilipp Reisner 2281b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2282b411b363SPhilipp Reisner { 22836184ea21SAndreas Gruenbacher int hg, rv = -100; 2284b411b363SPhilipp Reisner 2285b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_2p) { 2286b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2287b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2288b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2289b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2290b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2291b411b363SPhilipp Reisner case ASB_CONSENSUS: 2292b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2293b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2294b411b363SPhilipp Reisner break; 2295b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2296b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2297b411b363SPhilipp Reisner break; 2298b411b363SPhilipp Reisner case ASB_DISCONNECT: 2299b411b363SPhilipp Reisner break; 2300b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2301b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2302b411b363SPhilipp Reisner if (hg == -1) { 2303bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2304bb437946SAndreas Gruenbacher 2305b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2306b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2307b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2308bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2309bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2310b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2311b411b363SPhilipp Reisner } else { 2312b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2313b411b363SPhilipp Reisner rv = hg; 2314b411b363SPhilipp Reisner } 2315b411b363SPhilipp Reisner } else 2316b411b363SPhilipp Reisner rv = hg; 2317b411b363SPhilipp Reisner } 2318b411b363SPhilipp Reisner 2319b411b363SPhilipp Reisner return rv; 2320b411b363SPhilipp Reisner } 2321b411b363SPhilipp Reisner 2322b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2323b411b363SPhilipp Reisner u64 bits, u64 flags) 2324b411b363SPhilipp Reisner { 2325b411b363SPhilipp Reisner if (!uuid) { 2326b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2327b411b363SPhilipp Reisner return; 2328b411b363SPhilipp Reisner } 2329b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2330b411b363SPhilipp Reisner text, 2331b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2332b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2333b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2334b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2335b411b363SPhilipp Reisner (unsigned long long)bits, 2336b411b363SPhilipp Reisner (unsigned long long)flags); 2337b411b363SPhilipp Reisner } 2338b411b363SPhilipp Reisner 2339b411b363SPhilipp Reisner /* 2340b411b363SPhilipp Reisner 100 after split brain try auto recover 2341b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2342b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2343b411b363SPhilipp Reisner 0 no Sync 2344b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2345b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2346b411b363SPhilipp Reisner -100 after split brain, disconnect 2347b411b363SPhilipp Reisner -1000 unrelated data 23484a23f264SPhilipp Reisner -1091 requires proto 91 23494a23f264SPhilipp Reisner -1096 requires proto 96 2350b411b363SPhilipp Reisner */ 2351b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2352b411b363SPhilipp Reisner { 2353b411b363SPhilipp Reisner u64 self, peer; 2354b411b363SPhilipp Reisner int i, j; 2355b411b363SPhilipp Reisner 2356b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2357b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2358b411b363SPhilipp Reisner 2359b411b363SPhilipp Reisner *rule_nr = 10; 2360b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2361b411b363SPhilipp Reisner return 0; 2362b411b363SPhilipp Reisner 2363b411b363SPhilipp Reisner *rule_nr = 20; 2364b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2365b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2366b411b363SPhilipp Reisner return -2; 2367b411b363SPhilipp Reisner 2368b411b363SPhilipp Reisner *rule_nr = 30; 2369b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2370b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2371b411b363SPhilipp Reisner return 2; 2372b411b363SPhilipp Reisner 2373b411b363SPhilipp Reisner if (self == peer) { 2374b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2375b411b363SPhilipp Reisner 2376b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2377b411b363SPhilipp Reisner 2378b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 23794a23f264SPhilipp Reisner return -1091; 2380b411b363SPhilipp Reisner 2381b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2382b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2383b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2384b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2385b411b363SPhilipp Reisner 2386b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2387b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2388b411b363SPhilipp Reisner *rule_nr = 34; 2389b411b363SPhilipp Reisner } else { 2390b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2391b411b363SPhilipp Reisner *rule_nr = 36; 2392b411b363SPhilipp Reisner } 2393b411b363SPhilipp Reisner 2394b411b363SPhilipp Reisner return 1; 2395b411b363SPhilipp Reisner } 2396b411b363SPhilipp Reisner 2397b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2398b411b363SPhilipp Reisner 2399b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 24004a23f264SPhilipp Reisner return -1091; 2401b411b363SPhilipp Reisner 2402b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2403b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2404b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2405b411b363SPhilipp Reisner 2406b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2407b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2408b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2409b411b363SPhilipp Reisner 2410b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2411b411b363SPhilipp Reisner *rule_nr = 35; 2412b411b363SPhilipp Reisner } else { 2413b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2414b411b363SPhilipp Reisner *rule_nr = 37; 2415b411b363SPhilipp Reisner } 2416b411b363SPhilipp Reisner 2417b411b363SPhilipp Reisner return -1; 2418b411b363SPhilipp Reisner } 2419b411b363SPhilipp Reisner 2420b411b363SPhilipp Reisner /* Common power [off|failure] */ 2421b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2422b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2423b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2424b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2425b411b363SPhilipp Reisner *rule_nr = 40; 2426b411b363SPhilipp Reisner 2427b411b363SPhilipp Reisner switch (rct) { 2428b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2429b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2430b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2431b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 2432b411b363SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->flags); 2433b411b363SPhilipp Reisner return dc ? -1 : 1; 2434b411b363SPhilipp Reisner } 2435b411b363SPhilipp Reisner } 2436b411b363SPhilipp Reisner 2437b411b363SPhilipp Reisner *rule_nr = 50; 2438b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2439b411b363SPhilipp Reisner if (self == peer) 2440b411b363SPhilipp Reisner return -1; 2441b411b363SPhilipp Reisner 2442b411b363SPhilipp Reisner *rule_nr = 51; 2443b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2444b411b363SPhilipp Reisner if (self == peer) { 24454a23f264SPhilipp Reisner if (mdev->agreed_pro_version < 96 ? 24464a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 24474a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 24484a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2449b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2450b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2451b411b363SPhilipp Reisner 2452b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 24534a23f264SPhilipp Reisner return -1091; 2454b411b363SPhilipp Reisner 2455b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2456b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 24574a23f264SPhilipp Reisner 24584a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 24594a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 24604a23f264SPhilipp Reisner 2461b411b363SPhilipp Reisner return -1; 2462b411b363SPhilipp Reisner } 2463b411b363SPhilipp Reisner } 2464b411b363SPhilipp Reisner 2465b411b363SPhilipp Reisner *rule_nr = 60; 2466b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2467b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2468b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2469b411b363SPhilipp Reisner if (self == peer) 2470b411b363SPhilipp Reisner return -2; 2471b411b363SPhilipp Reisner } 2472b411b363SPhilipp Reisner 2473b411b363SPhilipp Reisner *rule_nr = 70; 2474b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2475b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2476b411b363SPhilipp Reisner if (self == peer) 2477b411b363SPhilipp Reisner return 1; 2478b411b363SPhilipp Reisner 2479b411b363SPhilipp Reisner *rule_nr = 71; 2480b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2481b411b363SPhilipp Reisner if (self == peer) { 24824a23f264SPhilipp Reisner if (mdev->agreed_pro_version < 96 ? 24834a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 24844a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 24854a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2486b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2487b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2488b411b363SPhilipp Reisner 2489b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 24904a23f264SPhilipp Reisner return -1091; 2491b411b363SPhilipp Reisner 2492b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2493b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2494b411b363SPhilipp Reisner 24954a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2496b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2497b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2498b411b363SPhilipp Reisner 2499b411b363SPhilipp Reisner return 1; 2500b411b363SPhilipp Reisner } 2501b411b363SPhilipp Reisner } 2502b411b363SPhilipp Reisner 2503b411b363SPhilipp Reisner 2504b411b363SPhilipp Reisner *rule_nr = 80; 2505d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2506b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2507b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2508b411b363SPhilipp Reisner if (self == peer) 2509b411b363SPhilipp Reisner return 2; 2510b411b363SPhilipp Reisner } 2511b411b363SPhilipp Reisner 2512b411b363SPhilipp Reisner *rule_nr = 90; 2513b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2514b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2515b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2516b411b363SPhilipp Reisner return 100; 2517b411b363SPhilipp Reisner 2518b411b363SPhilipp Reisner *rule_nr = 100; 2519b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2520b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2521b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2522b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2523b411b363SPhilipp Reisner if (self == peer) 2524b411b363SPhilipp Reisner return -100; 2525b411b363SPhilipp Reisner } 2526b411b363SPhilipp Reisner } 2527b411b363SPhilipp Reisner 2528b411b363SPhilipp Reisner return -1000; 2529b411b363SPhilipp Reisner } 2530b411b363SPhilipp Reisner 2531b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2532b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2533b411b363SPhilipp Reisner */ 2534b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2535b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2536b411b363SPhilipp Reisner { 2537b411b363SPhilipp Reisner int hg, rule_nr; 2538b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2539b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 2540b411b363SPhilipp Reisner 2541b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2542b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2543b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2544b411b363SPhilipp Reisner 2545b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2546b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2547b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2548b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2549b411b363SPhilipp Reisner 2550b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2551b411b363SPhilipp Reisner 2552b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2553b411b363SPhilipp Reisner 2554b411b363SPhilipp Reisner if (hg == -1000) { 2555b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2556b411b363SPhilipp Reisner return C_MASK; 2557b411b363SPhilipp Reisner } 25584a23f264SPhilipp Reisner if (hg < -1000) { 25594a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2560b411b363SPhilipp Reisner return C_MASK; 2561b411b363SPhilipp Reisner } 2562b411b363SPhilipp Reisner 2563b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2564b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2565b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2566b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2567b411b363SPhilipp Reisner if (f) 2568b411b363SPhilipp Reisner hg = hg*2; 2569b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2570b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2571b411b363SPhilipp Reisner } 2572b411b363SPhilipp Reisner 25733a11a487SAdam Gandelman if (abs(hg) == 100) 25743a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 25753a11a487SAdam Gandelman 2576b411b363SPhilipp Reisner if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) { 2577b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2578b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2579b411b363SPhilipp Reisner int forced = (hg == -100); 2580b411b363SPhilipp Reisner 2581b411b363SPhilipp Reisner switch (pcount) { 2582b411b363SPhilipp Reisner case 0: 2583b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2584b411b363SPhilipp Reisner break; 2585b411b363SPhilipp Reisner case 1: 2586b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2587b411b363SPhilipp Reisner break; 2588b411b363SPhilipp Reisner case 2: 2589b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2590b411b363SPhilipp Reisner break; 2591b411b363SPhilipp Reisner } 2592b411b363SPhilipp Reisner if (abs(hg) < 100) { 2593b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2594b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2595b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2596b411b363SPhilipp Reisner if (forced) { 2597b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2598b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2599b411b363SPhilipp Reisner hg = hg*2; 2600b411b363SPhilipp Reisner } 2601b411b363SPhilipp Reisner } 2602b411b363SPhilipp Reisner } 2603b411b363SPhilipp Reisner 2604b411b363SPhilipp Reisner if (hg == -100) { 2605b411b363SPhilipp Reisner if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2606b411b363SPhilipp Reisner hg = -1; 2607b411b363SPhilipp Reisner if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2608b411b363SPhilipp Reisner hg = 1; 2609b411b363SPhilipp Reisner 2610b411b363SPhilipp Reisner if (abs(hg) < 100) 2611b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2612b411b363SPhilipp Reisner "Sync from %s node\n", 2613b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2614b411b363SPhilipp Reisner } 2615b411b363SPhilipp Reisner 2616b411b363SPhilipp Reisner if (hg == -100) { 2617580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2618580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2619580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2620580b9767SLars Ellenberg * to that disk, in a way... */ 26213a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2622b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2623b411b363SPhilipp Reisner return C_MASK; 2624b411b363SPhilipp Reisner } 2625b411b363SPhilipp Reisner 2626b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2627b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2628b411b363SPhilipp Reisner return C_MASK; 2629b411b363SPhilipp Reisner } 2630b411b363SPhilipp Reisner 2631b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2632b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 2633b411b363SPhilipp Reisner switch (mdev->net_conf->rr_conflict) { 2634b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2635b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2636b411b363SPhilipp Reisner /* fall through */ 2637b411b363SPhilipp Reisner case ASB_DISCONNECT: 2638b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2639b411b363SPhilipp Reisner return C_MASK; 2640b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2641b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2642b411b363SPhilipp Reisner "assumption\n"); 2643b411b363SPhilipp Reisner } 2644b411b363SPhilipp Reisner } 2645b411b363SPhilipp Reisner 2646cf14c2e9SPhilipp Reisner if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { 2647cf14c2e9SPhilipp Reisner if (hg == 0) 2648cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2649cf14c2e9SPhilipp Reisner else 2650cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2651cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2652cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2653cf14c2e9SPhilipp Reisner return C_MASK; 2654cf14c2e9SPhilipp Reisner } 2655cf14c2e9SPhilipp Reisner 2656b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2657b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 265820ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 265920ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 2660b411b363SPhilipp Reisner return C_MASK; 2661b411b363SPhilipp Reisner } 2662b411b363SPhilipp Reisner 2663b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2664b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2665b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2666b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2667b411b363SPhilipp Reisner } else { 2668b411b363SPhilipp Reisner rv = C_CONNECTED; 2669b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2670b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2671b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2672b411b363SPhilipp Reisner } 2673b411b363SPhilipp Reisner } 2674b411b363SPhilipp Reisner 2675b411b363SPhilipp Reisner return rv; 2676b411b363SPhilipp Reisner } 2677b411b363SPhilipp Reisner 2678b411b363SPhilipp Reisner /* returns 1 if invalid */ 2679b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2680b411b363SPhilipp Reisner { 2681b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2682b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2683b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2684b411b363SPhilipp Reisner return 0; 2685b411b363SPhilipp Reisner 2686b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2687b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2688b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2689b411b363SPhilipp Reisner return 1; 2690b411b363SPhilipp Reisner 2691b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2692b411b363SPhilipp Reisner if (peer == self) 2693b411b363SPhilipp Reisner return 0; 2694b411b363SPhilipp Reisner 2695b411b363SPhilipp Reisner /* everything es is invalid. */ 2696b411b363SPhilipp Reisner return 1; 2697b411b363SPhilipp Reisner } 2698b411b363SPhilipp Reisner 269902918be2SPhilipp Reisner static int receive_protocol(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 2700b411b363SPhilipp Reisner { 270102918be2SPhilipp Reisner struct p_protocol *p = &mdev->data.rbuf.protocol; 2702b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2703cf14c2e9SPhilipp Reisner int p_want_lose, p_two_primaries, cf; 2704b411b363SPhilipp Reisner char p_integrity_alg[SHARED_SECRET_MAX] = ""; 2705b411b363SPhilipp Reisner 2706b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2707b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 2708b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 2709b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 2710b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 2711cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 2712cf14c2e9SPhilipp Reisner p_want_lose = cf & CF_WANT_LOSE; 2713cf14c2e9SPhilipp Reisner 2714cf14c2e9SPhilipp Reisner clear_bit(CONN_DRY_RUN, &mdev->flags); 2715cf14c2e9SPhilipp Reisner 2716cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 2717cf14c2e9SPhilipp Reisner set_bit(CONN_DRY_RUN, &mdev->flags); 2718b411b363SPhilipp Reisner 2719b411b363SPhilipp Reisner if (p_proto != mdev->net_conf->wire_protocol) { 2720b411b363SPhilipp Reisner dev_err(DEV, "incompatible communication protocols\n"); 2721b411b363SPhilipp Reisner goto disconnect; 2722b411b363SPhilipp Reisner } 2723b411b363SPhilipp Reisner 2724b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) { 2725b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-0pri settings\n"); 2726b411b363SPhilipp Reisner goto disconnect; 2727b411b363SPhilipp Reisner } 2728b411b363SPhilipp Reisner 2729b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) { 2730b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-1pri settings\n"); 2731b411b363SPhilipp Reisner goto disconnect; 2732b411b363SPhilipp Reisner } 2733b411b363SPhilipp Reisner 2734b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) { 2735b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-2pri settings\n"); 2736b411b363SPhilipp Reisner goto disconnect; 2737b411b363SPhilipp Reisner } 2738b411b363SPhilipp Reisner 2739b411b363SPhilipp Reisner if (p_want_lose && mdev->net_conf->want_lose) { 2740b411b363SPhilipp Reisner dev_err(DEV, "both sides have the 'want_lose' flag set\n"); 2741b411b363SPhilipp Reisner goto disconnect; 2742b411b363SPhilipp Reisner } 2743b411b363SPhilipp Reisner 2744b411b363SPhilipp Reisner if (p_two_primaries != mdev->net_conf->two_primaries) { 2745b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the two-primaries options\n"); 2746b411b363SPhilipp Reisner goto disconnect; 2747b411b363SPhilipp Reisner } 2748b411b363SPhilipp Reisner 2749b411b363SPhilipp Reisner if (mdev->agreed_pro_version >= 87) { 2750b411b363SPhilipp Reisner unsigned char *my_alg = mdev->net_conf->integrity_alg; 2751b411b363SPhilipp Reisner 2752b411b363SPhilipp Reisner if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) 275381e84650SAndreas Gruenbacher return false; 2754b411b363SPhilipp Reisner 2755b411b363SPhilipp Reisner p_integrity_alg[SHARED_SECRET_MAX-1] = 0; 2756b411b363SPhilipp Reisner if (strcmp(p_integrity_alg, my_alg)) { 2757b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); 2758b411b363SPhilipp Reisner goto disconnect; 2759b411b363SPhilipp Reisner } 2760b411b363SPhilipp Reisner dev_info(DEV, "data-integrity-alg: %s\n", 2761b411b363SPhilipp Reisner my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); 2762b411b363SPhilipp Reisner } 2763b411b363SPhilipp Reisner 276481e84650SAndreas Gruenbacher return true; 2765b411b363SPhilipp Reisner 2766b411b363SPhilipp Reisner disconnect: 2767b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 276881e84650SAndreas Gruenbacher return false; 2769b411b363SPhilipp Reisner } 2770b411b363SPhilipp Reisner 2771b411b363SPhilipp Reisner /* helper function 2772b411b363SPhilipp Reisner * input: alg name, feature name 2773b411b363SPhilipp Reisner * return: NULL (alg name was "") 2774b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 2775b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 2776b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 2777b411b363SPhilipp Reisner const char *alg, const char *name) 2778b411b363SPhilipp Reisner { 2779b411b363SPhilipp Reisner struct crypto_hash *tfm; 2780b411b363SPhilipp Reisner 2781b411b363SPhilipp Reisner if (!alg[0]) 2782b411b363SPhilipp Reisner return NULL; 2783b411b363SPhilipp Reisner 2784b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 2785b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 2786b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 2787b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 2788b411b363SPhilipp Reisner return tfm; 2789b411b363SPhilipp Reisner } 2790b411b363SPhilipp Reisner if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 2791b411b363SPhilipp Reisner crypto_free_hash(tfm); 2792b411b363SPhilipp Reisner dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); 2793b411b363SPhilipp Reisner return ERR_PTR(-EINVAL); 2794b411b363SPhilipp Reisner } 2795b411b363SPhilipp Reisner return tfm; 2796b411b363SPhilipp Reisner } 2797b411b363SPhilipp Reisner 279802918be2SPhilipp Reisner static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int packet_size) 2799b411b363SPhilipp Reisner { 280081e84650SAndreas Gruenbacher int ok = true; 280102918be2SPhilipp Reisner struct p_rs_param_95 *p = &mdev->data.rbuf.rs_param_95; 2802b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 2803b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 2804b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 2805b411b363SPhilipp Reisner const int apv = mdev->agreed_pro_version; 2806778f271dSPhilipp Reisner int *rs_plan_s = NULL; 2807778f271dSPhilipp Reisner int fifo_size = 0; 2808b411b363SPhilipp Reisner 2809b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 2810b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 2811b411b363SPhilipp Reisner + SHARED_SECRET_MAX 28128e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 28138e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 2814b411b363SPhilipp Reisner 281502918be2SPhilipp Reisner if (packet_size > exp_max_sz) { 2816b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 281702918be2SPhilipp Reisner packet_size, exp_max_sz); 281881e84650SAndreas Gruenbacher return false; 2819b411b363SPhilipp Reisner } 2820b411b363SPhilipp Reisner 2821b411b363SPhilipp Reisner if (apv <= 88) { 282202918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param) - sizeof(struct p_header80); 282302918be2SPhilipp Reisner data_size = packet_size - header_size; 28248e26f9ccSPhilipp Reisner } else if (apv <= 94) { 282502918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header80); 282602918be2SPhilipp Reisner data_size = packet_size - header_size; 2827b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 28288e26f9ccSPhilipp Reisner } else { 282902918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header80); 283002918be2SPhilipp Reisner data_size = packet_size - header_size; 2831b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 2832b411b363SPhilipp Reisner } 2833b411b363SPhilipp Reisner 2834b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 2835b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 2836b411b363SPhilipp Reisner 283702918be2SPhilipp Reisner if (drbd_recv(mdev, &p->head.payload, header_size) != header_size) 283881e84650SAndreas Gruenbacher return false; 2839b411b363SPhilipp Reisner 2840b411b363SPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 2841b411b363SPhilipp Reisner 2842b411b363SPhilipp Reisner if (apv >= 88) { 2843b411b363SPhilipp Reisner if (apv == 88) { 28445de73827SPhilipp Reisner if (data_size > SHARED_SECRET_MAX || data_size == 0) { 28455de73827SPhilipp Reisner dev_err(DEV, "verify-alg of wrong size, " 28465de73827SPhilipp Reisner "peer wants %u, accepting only up to %u byte\n", 2847b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 284881e84650SAndreas Gruenbacher return false; 2849b411b363SPhilipp Reisner } 2850b411b363SPhilipp Reisner 2851b411b363SPhilipp Reisner if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) 285281e84650SAndreas Gruenbacher return false; 2853b411b363SPhilipp Reisner 2854b411b363SPhilipp Reisner /* we expect NUL terminated string */ 2855b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2856b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 2857b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 2858b411b363SPhilipp Reisner 2859b411b363SPhilipp Reisner } else /* apv >= 89 */ { 2860b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 2861b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2862b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 2863b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 2864b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 2865b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 2866b411b363SPhilipp Reisner } 2867b411b363SPhilipp Reisner 2868b411b363SPhilipp Reisner if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { 2869b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2870b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 2871b411b363SPhilipp Reisner mdev->sync_conf.verify_alg, p->verify_alg); 2872b411b363SPhilipp Reisner goto disconnect; 2873b411b363SPhilipp Reisner } 2874b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 2875b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 2876b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 2877b411b363SPhilipp Reisner verify_tfm = NULL; 2878b411b363SPhilipp Reisner goto disconnect; 2879b411b363SPhilipp Reisner } 2880b411b363SPhilipp Reisner } 2881b411b363SPhilipp Reisner 2882b411b363SPhilipp Reisner if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { 2883b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2884b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 2885b411b363SPhilipp Reisner mdev->sync_conf.csums_alg, p->csums_alg); 2886b411b363SPhilipp Reisner goto disconnect; 2887b411b363SPhilipp Reisner } 2888b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 2889b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 2890b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 2891b411b363SPhilipp Reisner csums_tfm = NULL; 2892b411b363SPhilipp Reisner goto disconnect; 2893b411b363SPhilipp Reisner } 2894b411b363SPhilipp Reisner } 2895b411b363SPhilipp Reisner 28968e26f9ccSPhilipp Reisner if (apv > 94) { 28978e26f9ccSPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 28988e26f9ccSPhilipp Reisner mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 28998e26f9ccSPhilipp Reisner mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target); 29008e26f9ccSPhilipp Reisner mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target); 29018e26f9ccSPhilipp Reisner mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate); 2902778f271dSPhilipp Reisner 2903778f271dSPhilipp Reisner fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 2904778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 2905778f271dSPhilipp Reisner rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 2906778f271dSPhilipp Reisner if (!rs_plan_s) { 2907778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 2908778f271dSPhilipp Reisner goto disconnect; 2909778f271dSPhilipp Reisner } 2910778f271dSPhilipp Reisner } 29118e26f9ccSPhilipp Reisner } 2912b411b363SPhilipp Reisner 2913b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 2914b411b363SPhilipp Reisner /* lock against drbd_nl_syncer_conf() */ 2915b411b363SPhilipp Reisner if (verify_tfm) { 2916b411b363SPhilipp Reisner strcpy(mdev->sync_conf.verify_alg, p->verify_alg); 2917b411b363SPhilipp Reisner mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; 2918b411b363SPhilipp Reisner crypto_free_hash(mdev->verify_tfm); 2919b411b363SPhilipp Reisner mdev->verify_tfm = verify_tfm; 2920b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 2921b411b363SPhilipp Reisner } 2922b411b363SPhilipp Reisner if (csums_tfm) { 2923b411b363SPhilipp Reisner strcpy(mdev->sync_conf.csums_alg, p->csums_alg); 2924b411b363SPhilipp Reisner mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; 2925b411b363SPhilipp Reisner crypto_free_hash(mdev->csums_tfm); 2926b411b363SPhilipp Reisner mdev->csums_tfm = csums_tfm; 2927b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 2928b411b363SPhilipp Reisner } 2929778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size) { 2930778f271dSPhilipp Reisner kfree(mdev->rs_plan_s.values); 2931778f271dSPhilipp Reisner mdev->rs_plan_s.values = rs_plan_s; 2932778f271dSPhilipp Reisner mdev->rs_plan_s.size = fifo_size; 2933778f271dSPhilipp Reisner mdev->rs_planed = 0; 2934778f271dSPhilipp Reisner } 2935b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 2936b411b363SPhilipp Reisner } 2937b411b363SPhilipp Reisner 2938b411b363SPhilipp Reisner return ok; 2939b411b363SPhilipp Reisner disconnect: 2940b411b363SPhilipp Reisner /* just for completeness: actually not needed, 2941b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 2942b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 2943b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 2944b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 2945b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 294681e84650SAndreas Gruenbacher return false; 2947b411b363SPhilipp Reisner } 2948b411b363SPhilipp Reisner 2949b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 2950b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 2951b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 2952b411b363SPhilipp Reisner { 2953b411b363SPhilipp Reisner sector_t d; 2954b411b363SPhilipp Reisner if (a == 0 || b == 0) 2955b411b363SPhilipp Reisner return; 2956b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 2957b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 2958b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 2959b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 2960b411b363SPhilipp Reisner } 2961b411b363SPhilipp Reisner 296202918be2SPhilipp Reisner static int receive_sizes(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 2963b411b363SPhilipp Reisner { 296402918be2SPhilipp Reisner struct p_sizes *p = &mdev->data.rbuf.sizes; 2965b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 2966b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 2967b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 2968e89b591cSPhilipp Reisner enum dds_flags ddsf; 2969b411b363SPhilipp Reisner 2970b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 2971b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 2972b411b363SPhilipp Reisner 2973b411b363SPhilipp Reisner if (p_size == 0 && mdev->state.disk == D_DISKLESS) { 2974b411b363SPhilipp Reisner dev_err(DEV, "some backing storage is needed\n"); 2975b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 297681e84650SAndreas Gruenbacher return false; 2977b411b363SPhilipp Reisner } 2978b411b363SPhilipp Reisner 2979b411b363SPhilipp Reisner /* just store the peer's disk size for now. 2980b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 2981b411b363SPhilipp Reisner mdev->p_size = p_size; 2982b411b363SPhilipp Reisner 2983b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2984b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 2985b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 2986b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 2987b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 2988b411b363SPhilipp Reisner 2989b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 2990b411b363SPhilipp Reisner * param exchange, choose the minimum */ 2991b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 2992b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 2993b411b363SPhilipp Reisner p_usize); 2994b411b363SPhilipp Reisner 2995b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 2996b411b363SPhilipp Reisner 2997b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 2998b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 2999b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3000b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 3001b411b363SPhilipp Reisner } 3002b411b363SPhilipp Reisner 3003b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3004b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3005a393db6fSPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, 0) < 3006b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3007b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3008b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3009b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 3010b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3011b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 3012b411b363SPhilipp Reisner put_ldev(mdev); 301381e84650SAndreas Gruenbacher return false; 3014b411b363SPhilipp Reisner } 3015b411b363SPhilipp Reisner put_ldev(mdev); 3016b411b363SPhilipp Reisner } 3017b411b363SPhilipp Reisner 3018e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3019b411b363SPhilipp Reisner if (get_ldev(mdev)) { 302024c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 3021b411b363SPhilipp Reisner put_ldev(mdev); 3022b411b363SPhilipp Reisner if (dd == dev_size_error) 302381e84650SAndreas Gruenbacher return false; 3024b411b363SPhilipp Reisner drbd_md_sync(mdev); 3025b411b363SPhilipp Reisner } else { 3026b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3027b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3028b411b363SPhilipp Reisner } 3029b411b363SPhilipp Reisner 303099432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 303199432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 303299432fccSPhilipp Reisner 3033b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3034b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3035b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3036b411b363SPhilipp Reisner ldsc = 1; 3037b411b363SPhilipp Reisner } 3038b411b363SPhilipp Reisner 3039b411b363SPhilipp Reisner put_ldev(mdev); 3040b411b363SPhilipp Reisner } 3041b411b363SPhilipp Reisner 3042b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3043b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3044b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3045b411b363SPhilipp Reisner /* we have different sizes, probably peer 3046b411b363SPhilipp Reisner * needs to know my new size... */ 3047e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3048b411b363SPhilipp Reisner } 3049b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3050b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3051b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3052e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3053e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3054e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3055b411b363SPhilipp Reisner else 3056e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3057e89b591cSPhilipp Reisner } else 3058b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3059b411b363SPhilipp Reisner } 3060b411b363SPhilipp Reisner } 3061b411b363SPhilipp Reisner 306281e84650SAndreas Gruenbacher return true; 3063b411b363SPhilipp Reisner } 3064b411b363SPhilipp Reisner 306502918be2SPhilipp Reisner static int receive_uuids(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3066b411b363SPhilipp Reisner { 306702918be2SPhilipp Reisner struct p_uuids *p = &mdev->data.rbuf.uuids; 3068b411b363SPhilipp Reisner u64 *p_uuid; 306962b0da3aSLars Ellenberg int i, updated_uuids = 0; 3070b411b363SPhilipp Reisner 3071b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3072b411b363SPhilipp Reisner 3073b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3074b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3075b411b363SPhilipp Reisner 3076b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3077b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3078b411b363SPhilipp Reisner 3079b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3080b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3081b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3082b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3083b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3084b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 3085b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 308681e84650SAndreas Gruenbacher return false; 3087b411b363SPhilipp Reisner } 3088b411b363SPhilipp Reisner 3089b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3090b411b363SPhilipp Reisner int skip_initial_sync = 3091b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 3092b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90 && 3093b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3094b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3095b411b363SPhilipp Reisner if (skip_initial_sync) { 3096b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3097b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 309820ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 309920ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3100b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3101b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3102b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3103b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3104b411b363SPhilipp Reisner drbd_md_sync(mdev); 310562b0da3aSLars Ellenberg updated_uuids = 1; 3106b411b363SPhilipp Reisner } 3107b411b363SPhilipp Reisner put_ldev(mdev); 310818a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 310918a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 311018a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 311118a50fa2SPhilipp Reisner for me. */ 311262b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3113b411b363SPhilipp Reisner } 3114b411b363SPhilipp Reisner 3115b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3116b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3117b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3118b411b363SPhilipp Reisner new disk state... */ 3119b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); 3120b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 312162b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 312262b0da3aSLars Ellenberg 312362b0da3aSLars Ellenberg if (updated_uuids) 312462b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3125b411b363SPhilipp Reisner 312681e84650SAndreas Gruenbacher return true; 3127b411b363SPhilipp Reisner } 3128b411b363SPhilipp Reisner 3129b411b363SPhilipp Reisner /** 3130b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3131b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3132b411b363SPhilipp Reisner */ 3133b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3134b411b363SPhilipp Reisner { 3135b411b363SPhilipp Reisner union drbd_state ms; 3136b411b363SPhilipp Reisner 3137b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3138b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3139b411b363SPhilipp Reisner 3140b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3141b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3142b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3143b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3144b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3145b411b363SPhilipp Reisner }; 3146b411b363SPhilipp Reisner 3147b411b363SPhilipp Reisner ms.i = ps.i; 3148b411b363SPhilipp Reisner 3149b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3150b411b363SPhilipp Reisner ms.peer = ps.role; 3151b411b363SPhilipp Reisner ms.role = ps.peer; 3152b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3153b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3154b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3155b411b363SPhilipp Reisner 3156b411b363SPhilipp Reisner return ms; 3157b411b363SPhilipp Reisner } 3158b411b363SPhilipp Reisner 315902918be2SPhilipp Reisner static int receive_req_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3160b411b363SPhilipp Reisner { 316102918be2SPhilipp Reisner struct p_req_state *p = &mdev->data.rbuf.req_state; 3162b411b363SPhilipp Reisner union drbd_state mask, val; 3163bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3164b411b363SPhilipp Reisner 3165b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3166b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3167b411b363SPhilipp Reisner 3168b411b363SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->flags) && 3169b411b363SPhilipp Reisner test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { 3170b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 317181e84650SAndreas Gruenbacher return true; 3172b411b363SPhilipp Reisner } 3173b411b363SPhilipp Reisner 3174b411b363SPhilipp Reisner mask = convert_state(mask); 3175b411b363SPhilipp Reisner val = convert_state(val); 3176b411b363SPhilipp Reisner 3177b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3178b411b363SPhilipp Reisner 3179b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3180b411b363SPhilipp Reisner drbd_md_sync(mdev); 3181b411b363SPhilipp Reisner 318281e84650SAndreas Gruenbacher return true; 3183b411b363SPhilipp Reisner } 3184b411b363SPhilipp Reisner 318502918be2SPhilipp Reisner static int receive_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3186b411b363SPhilipp Reisner { 318702918be2SPhilipp Reisner struct p_state *p = &mdev->data.rbuf.state; 31884ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3189b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 319065d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3191b411b363SPhilipp Reisner int rv; 3192b411b363SPhilipp Reisner 3193b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3194b411b363SPhilipp Reisner 3195b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3196b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3197b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3198b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3199b411b363SPhilipp Reisner } 3200b411b363SPhilipp Reisner 3201b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3202b411b363SPhilipp Reisner retry: 32034ac4aadaSLars Ellenberg os = ns = mdev->state; 3204b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3205b411b363SPhilipp Reisner 3206545752d5SLars Ellenberg /* If some other part of the code (asender thread, timeout) 3207545752d5SLars Ellenberg * already decided to close the connection again, 3208545752d5SLars Ellenberg * we must not "re-establish" it here. */ 3209545752d5SLars Ellenberg if (os.conn <= C_TEAR_DOWN) 3210545752d5SLars Ellenberg return false; 3211545752d5SLars Ellenberg 321240424e4aSLars Ellenberg /* If this is the "end of sync" confirmation, usually the peer disk 321340424e4aSLars Ellenberg * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits 321440424e4aSLars Ellenberg * set) resync started in PausedSyncT, or if the timing of pause-/ 321540424e4aSLars Ellenberg * unpause-sync events has been "just right", the peer disk may 321640424e4aSLars Ellenberg * transition from D_CONSISTENT to D_UP_TO_DATE as well. 321740424e4aSLars Ellenberg */ 321840424e4aSLars Ellenberg if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && 321940424e4aSLars Ellenberg real_peer_disk == D_UP_TO_DATE && 3220e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3221e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3222e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3223e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3224e9ef7bb6SLars Ellenberg * syncing states. 3225e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3226e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3227e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3228e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3229e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3230e9ef7bb6SLars Ellenberg 3231e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3232e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3233e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3234e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3235e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3236e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3237e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 323881e84650SAndreas Gruenbacher return true; 3239e9ef7bb6SLars Ellenberg } 3240e9ef7bb6SLars Ellenberg } 3241e9ef7bb6SLars Ellenberg 3242e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3243e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3244e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3245e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3246e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3247e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3248e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3249e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3250e9ef7bb6SLars Ellenberg 32514ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 32524ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3253b411b363SPhilipp Reisner 325467531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 325567531718SPhilipp Reisner ns.conn = C_BEHIND; 325667531718SPhilipp Reisner 3257b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3258b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3259b411b363SPhilipp Reisner int cr; /* consider resync */ 3260b411b363SPhilipp Reisner 3261b411b363SPhilipp Reisner /* if we established a new connection */ 32624ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3263b411b363SPhilipp Reisner /* if we had an established connection 3264b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 32654ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3266b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 32674ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3268b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3269b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3270b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3271b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3272b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 32734ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3274b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3275b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3276b411b363SPhilipp Reisner 3277b411b363SPhilipp Reisner if (cr) 32784ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3279b411b363SPhilipp Reisner 3280b411b363SPhilipp Reisner put_ldev(mdev); 32814ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 32824ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3283b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 328482f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3285b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3286b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3287b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3288580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3289b411b363SPhilipp Reisner } else { 3290cf14c2e9SPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) 329181e84650SAndreas Gruenbacher return false; 32924ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 3293b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 329481e84650SAndreas Gruenbacher return false; 3295b411b363SPhilipp Reisner } 3296b411b363SPhilipp Reisner } 3297b411b363SPhilipp Reisner } 3298b411b363SPhilipp Reisner 3299b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 33004ac4aadaSLars Ellenberg if (mdev->state.i != os.i) 3301b411b363SPhilipp Reisner goto retry; 3302b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3303b411b363SPhilipp Reisner ns.peer = peer_state.role; 3304b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3305b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 33064ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3307b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 33084ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 33094ac4aadaSLars Ellenberg if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3310481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 3311481c6f50SPhilipp Reisner /* Do not allow tl_restart(resend) for a rebooted peer. We can only allow this 3312481c6f50SPhilipp Reisner for temporal network outages! */ 3313481c6f50SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3314481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 3315481c6f50SPhilipp Reisner tl_clear(mdev); 3316481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3317481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 3318481c6f50SPhilipp Reisner drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0)); 331981e84650SAndreas Gruenbacher return false; 3320481c6f50SPhilipp Reisner } 332165d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 3322b411b363SPhilipp Reisner ns = mdev->state; 3323b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3324b411b363SPhilipp Reisner 3325b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 3326b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 332781e84650SAndreas Gruenbacher return false; 3328b411b363SPhilipp Reisner } 3329b411b363SPhilipp Reisner 33304ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 33314ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3332b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3333b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3334b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3335b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3336b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3337f479ea06SLars Ellenberg drbd_send_current_state(mdev); 3338b411b363SPhilipp Reisner } 3339b411b363SPhilipp Reisner } 3340b411b363SPhilipp Reisner 3341b411b363SPhilipp Reisner mdev->net_conf->want_lose = 0; 3342b411b363SPhilipp Reisner 3343b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3344b411b363SPhilipp Reisner 334581e84650SAndreas Gruenbacher return true; 3346b411b363SPhilipp Reisner } 3347b411b363SPhilipp Reisner 334802918be2SPhilipp Reisner static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3349b411b363SPhilipp Reisner { 335002918be2SPhilipp Reisner struct p_rs_uuid *p = &mdev->data.rbuf.rs_uuid; 3351b411b363SPhilipp Reisner 3352b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3353b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3354c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3355b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3356b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3357b411b363SPhilipp Reisner 3358b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3359b411b363SPhilipp Reisner 3360b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3361b411b363SPhilipp Reisner _not_ be rotated into the history */ 3362b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3363b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3364b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3365b411b363SPhilipp Reisner 336662b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3367b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3368b411b363SPhilipp Reisner 3369b411b363SPhilipp Reisner put_ldev(mdev); 3370b411b363SPhilipp Reisner } else 3371b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3372b411b363SPhilipp Reisner 337381e84650SAndreas Gruenbacher return true; 3374b411b363SPhilipp Reisner } 3375b411b363SPhilipp Reisner 33762c46407dSAndreas Gruenbacher /** 33772c46407dSAndreas Gruenbacher * receive_bitmap_plain 33782c46407dSAndreas Gruenbacher * 33792c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 33802c46407dSAndreas Gruenbacher * code upon failure. 33812c46407dSAndreas Gruenbacher */ 33822c46407dSAndreas Gruenbacher static int 338302918be2SPhilipp Reisner receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size, 3384b411b363SPhilipp Reisner unsigned long *buffer, struct bm_xfer_ctx *c) 3385b411b363SPhilipp Reisner { 3386b411b363SPhilipp Reisner unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); 3387b411b363SPhilipp Reisner unsigned want = num_words * sizeof(long); 33882c46407dSAndreas Gruenbacher int err; 3389b411b363SPhilipp Reisner 339002918be2SPhilipp Reisner if (want != data_size) { 339102918be2SPhilipp Reisner dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size); 33922c46407dSAndreas Gruenbacher return -EIO; 3393b411b363SPhilipp Reisner } 3394b411b363SPhilipp Reisner if (want == 0) 33952c46407dSAndreas Gruenbacher return 0; 33962c46407dSAndreas Gruenbacher err = drbd_recv(mdev, buffer, want); 33972c46407dSAndreas Gruenbacher if (err != want) { 33982c46407dSAndreas Gruenbacher if (err >= 0) 33992c46407dSAndreas Gruenbacher err = -EIO; 34002c46407dSAndreas Gruenbacher return err; 34012c46407dSAndreas Gruenbacher } 3402b411b363SPhilipp Reisner 3403b411b363SPhilipp Reisner drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); 3404b411b363SPhilipp Reisner 3405b411b363SPhilipp Reisner c->word_offset += num_words; 3406b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3407b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3408b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3409b411b363SPhilipp Reisner 34102c46407dSAndreas Gruenbacher return 1; 3411b411b363SPhilipp Reisner } 3412b411b363SPhilipp Reisner 34132c46407dSAndreas Gruenbacher /** 34142c46407dSAndreas Gruenbacher * recv_bm_rle_bits 34152c46407dSAndreas Gruenbacher * 34162c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 34172c46407dSAndreas Gruenbacher * code upon failure. 34182c46407dSAndreas Gruenbacher */ 34192c46407dSAndreas Gruenbacher static int 3420b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3421b411b363SPhilipp Reisner struct p_compressed_bm *p, 3422b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3423b411b363SPhilipp Reisner { 3424b411b363SPhilipp Reisner struct bitstream bs; 3425b411b363SPhilipp Reisner u64 look_ahead; 3426b411b363SPhilipp Reisner u64 rl; 3427b411b363SPhilipp Reisner u64 tmp; 3428b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3429b411b363SPhilipp Reisner unsigned long e; 3430004352faSLars Ellenberg int len = be16_to_cpu(p->head.length) - (sizeof(*p) - sizeof(p->head)); 3431b411b363SPhilipp Reisner int toggle = DCBP_get_start(p); 3432b411b363SPhilipp Reisner int have; 3433b411b363SPhilipp Reisner int bits; 3434b411b363SPhilipp Reisner 3435b411b363SPhilipp Reisner bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); 3436b411b363SPhilipp Reisner 3437b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3438b411b363SPhilipp Reisner if (bits < 0) 34392c46407dSAndreas Gruenbacher return -EIO; 3440b411b363SPhilipp Reisner 3441b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3442b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3443b411b363SPhilipp Reisner if (bits <= 0) 34442c46407dSAndreas Gruenbacher return -EIO; 3445b411b363SPhilipp Reisner 3446b411b363SPhilipp Reisner if (toggle) { 3447b411b363SPhilipp Reisner e = s + rl -1; 3448b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3449b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 34502c46407dSAndreas Gruenbacher return -EIO; 3451b411b363SPhilipp Reisner } 3452b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3453b411b363SPhilipp Reisner } 3454b411b363SPhilipp Reisner 3455b411b363SPhilipp Reisner if (have < bits) { 3456b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3457b411b363SPhilipp Reisner have, bits, look_ahead, 3458b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3459b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 34602c46407dSAndreas Gruenbacher return -EIO; 3461b411b363SPhilipp Reisner } 3462b411b363SPhilipp Reisner look_ahead >>= bits; 3463b411b363SPhilipp Reisner have -= bits; 3464b411b363SPhilipp Reisner 3465b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3466b411b363SPhilipp Reisner if (bits < 0) 34672c46407dSAndreas Gruenbacher return -EIO; 3468b411b363SPhilipp Reisner look_ahead |= tmp << have; 3469b411b363SPhilipp Reisner have += bits; 3470b411b363SPhilipp Reisner } 3471b411b363SPhilipp Reisner 3472b411b363SPhilipp Reisner c->bit_offset = s; 3473b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3474b411b363SPhilipp Reisner 34752c46407dSAndreas Gruenbacher return (s != c->bm_bits); 3476b411b363SPhilipp Reisner } 3477b411b363SPhilipp Reisner 34782c46407dSAndreas Gruenbacher /** 34792c46407dSAndreas Gruenbacher * decode_bitmap_c 34802c46407dSAndreas Gruenbacher * 34812c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 34822c46407dSAndreas Gruenbacher * code upon failure. 34832c46407dSAndreas Gruenbacher */ 34842c46407dSAndreas Gruenbacher static int 3485b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3486b411b363SPhilipp Reisner struct p_compressed_bm *p, 3487b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3488b411b363SPhilipp Reisner { 3489b411b363SPhilipp Reisner if (DCBP_get_code(p) == RLE_VLI_Bits) 3490b411b363SPhilipp Reisner return recv_bm_rle_bits(mdev, p, c); 3491b411b363SPhilipp Reisner 3492b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3493b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3494b411b363SPhilipp Reisner * during all our tests. */ 3495b411b363SPhilipp Reisner 3496b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 3497b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 34982c46407dSAndreas Gruenbacher return -EIO; 3499b411b363SPhilipp Reisner } 3500b411b363SPhilipp Reisner 3501b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3502b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3503b411b363SPhilipp Reisner { 3504b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 35050b70a13dSPhilipp Reisner unsigned plain = sizeof(struct p_header80) * 3506b411b363SPhilipp Reisner ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) 3507b411b363SPhilipp Reisner + c->bm_words * sizeof(long); 3508b411b363SPhilipp Reisner unsigned total = c->bytes[0] + c->bytes[1]; 3509b411b363SPhilipp Reisner unsigned r; 3510b411b363SPhilipp Reisner 3511b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3512b411b363SPhilipp Reisner if (total == 0) 3513b411b363SPhilipp Reisner return; 3514b411b363SPhilipp Reisner 3515b411b363SPhilipp Reisner /* don't report if not compressed */ 3516b411b363SPhilipp Reisner if (total >= plain) 3517b411b363SPhilipp Reisner return; 3518b411b363SPhilipp Reisner 3519b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3520b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3521b411b363SPhilipp Reisner : (1000 * total / plain); 3522b411b363SPhilipp Reisner 3523b411b363SPhilipp Reisner if (r > 1000) 3524b411b363SPhilipp Reisner r = 1000; 3525b411b363SPhilipp Reisner 3526b411b363SPhilipp Reisner r = 1000 - r; 3527b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3528b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3529b411b363SPhilipp Reisner direction, 3530b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3531b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3532b411b363SPhilipp Reisner total, r/10, r % 10); 3533b411b363SPhilipp Reisner } 3534b411b363SPhilipp Reisner 3535b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3536b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3537b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3538b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3539b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3540b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3541b411b363SPhilipp Reisner 3542b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 354302918be2SPhilipp Reisner static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3544b411b363SPhilipp Reisner { 3545b411b363SPhilipp Reisner struct bm_xfer_ctx c; 3546b411b363SPhilipp Reisner void *buffer; 35472c46407dSAndreas Gruenbacher int err; 354881e84650SAndreas Gruenbacher int ok = false; 354902918be2SPhilipp Reisner struct p_header80 *h = &mdev->data.rbuf.header.h80; 3550b411b363SPhilipp Reisner 355120ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 355220ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 355320ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 3554b411b363SPhilipp Reisner 3555b411b363SPhilipp Reisner /* maybe we should use some per thread scratch page, 3556b411b363SPhilipp Reisner * and allocate that during initial device creation? */ 3557b411b363SPhilipp Reisner buffer = (unsigned long *) __get_free_page(GFP_NOIO); 3558b411b363SPhilipp Reisner if (!buffer) { 3559b411b363SPhilipp Reisner dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); 3560b411b363SPhilipp Reisner goto out; 3561b411b363SPhilipp Reisner } 3562b411b363SPhilipp Reisner 3563b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3564b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3565b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3566b411b363SPhilipp Reisner }; 3567b411b363SPhilipp Reisner 35682c46407dSAndreas Gruenbacher for(;;) { 356902918be2SPhilipp Reisner if (cmd == P_BITMAP) { 35702c46407dSAndreas Gruenbacher err = receive_bitmap_plain(mdev, data_size, buffer, &c); 357102918be2SPhilipp Reisner } else if (cmd == P_COMPRESSED_BITMAP) { 3572b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3573b411b363SPhilipp Reisner * and the feature is enabled! */ 3574b411b363SPhilipp Reisner struct p_compressed_bm *p; 3575b411b363SPhilipp Reisner 357602918be2SPhilipp Reisner if (data_size > BM_PACKET_PAYLOAD_BYTES) { 3577b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 3578b411b363SPhilipp Reisner goto out; 3579b411b363SPhilipp Reisner } 3580b411b363SPhilipp Reisner /* use the page buff */ 3581b411b363SPhilipp Reisner p = buffer; 3582b411b363SPhilipp Reisner memcpy(p, h, sizeof(*h)); 358302918be2SPhilipp Reisner if (drbd_recv(mdev, p->head.payload, data_size) != data_size) 3584b411b363SPhilipp Reisner goto out; 3585004352faSLars Ellenberg if (data_size <= (sizeof(*p) - sizeof(p->head))) { 3586004352faSLars Ellenberg dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size); 358778fcbdaeSAndreas Gruenbacher goto out; 3588b411b363SPhilipp Reisner } 35892c46407dSAndreas Gruenbacher err = decode_bitmap_c(mdev, p, &c); 3590b411b363SPhilipp Reisner } else { 359102918be2SPhilipp Reisner dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd); 3592b411b363SPhilipp Reisner goto out; 3593b411b363SPhilipp Reisner } 3594b411b363SPhilipp Reisner 359502918be2SPhilipp Reisner c.packets[cmd == P_BITMAP]++; 359602918be2SPhilipp Reisner c.bytes[cmd == P_BITMAP] += sizeof(struct p_header80) + data_size; 3597b411b363SPhilipp Reisner 35982c46407dSAndreas Gruenbacher if (err <= 0) { 35992c46407dSAndreas Gruenbacher if (err < 0) 36002c46407dSAndreas Gruenbacher goto out; 3601b411b363SPhilipp Reisner break; 36022c46407dSAndreas Gruenbacher } 360302918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &data_size)) 3604b411b363SPhilipp Reisner goto out; 36052c46407dSAndreas Gruenbacher } 3606b411b363SPhilipp Reisner 3607b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 3608b411b363SPhilipp Reisner 3609b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 3610de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 3611de1f8e4aSAndreas Gruenbacher 3612b411b363SPhilipp Reisner ok = !drbd_send_bitmap(mdev); 3613b411b363SPhilipp Reisner if (!ok) 3614b411b363SPhilipp Reisner goto out; 3615b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 3616de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 3617de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 3618b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 3619b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 3620b411b363SPhilipp Reisner * other threads may have noticed network errors */ 3621b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 3622b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3623b411b363SPhilipp Reisner } 3624b411b363SPhilipp Reisner 362581e84650SAndreas Gruenbacher ok = true; 3626b411b363SPhilipp Reisner out: 362720ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 3628b411b363SPhilipp Reisner if (ok && mdev->state.conn == C_WF_BITMAP_S) 3629b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 3630b411b363SPhilipp Reisner free_page((unsigned long) buffer); 3631b411b363SPhilipp Reisner return ok; 3632b411b363SPhilipp Reisner } 3633b411b363SPhilipp Reisner 363402918be2SPhilipp Reisner static int receive_skip(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3635b411b363SPhilipp Reisner { 3636b411b363SPhilipp Reisner /* TODO zero copy sink :) */ 3637b411b363SPhilipp Reisner static char sink[128]; 3638b411b363SPhilipp Reisner int size, want, r; 3639b411b363SPhilipp Reisner 3640b411b363SPhilipp Reisner dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", 364102918be2SPhilipp Reisner cmd, data_size); 3642b411b363SPhilipp Reisner 364302918be2SPhilipp Reisner size = data_size; 3644b411b363SPhilipp Reisner while (size > 0) { 3645b411b363SPhilipp Reisner want = min_t(int, size, sizeof(sink)); 3646b411b363SPhilipp Reisner r = drbd_recv(mdev, sink, want); 3647b411b363SPhilipp Reisner ERR_IF(r <= 0) break; 3648b411b363SPhilipp Reisner size -= r; 3649b411b363SPhilipp Reisner } 3650b411b363SPhilipp Reisner return size == 0; 3651b411b363SPhilipp Reisner } 3652b411b363SPhilipp Reisner 365302918be2SPhilipp Reisner static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3654b411b363SPhilipp Reisner { 3655b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 3656b411b363SPhilipp Reisner * with the data requests being unplugged */ 3657b411b363SPhilipp Reisner drbd_tcp_quickack(mdev->data.socket); 3658b411b363SPhilipp Reisner 365981e84650SAndreas Gruenbacher return true; 3660b411b363SPhilipp Reisner } 3661b411b363SPhilipp Reisner 366273a01a18SPhilipp Reisner static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 366373a01a18SPhilipp Reisner { 366473a01a18SPhilipp Reisner struct p_block_desc *p = &mdev->data.rbuf.block_desc; 366573a01a18SPhilipp Reisner 3666f735e363SLars Ellenberg switch (mdev->state.conn) { 3667f735e363SLars Ellenberg case C_WF_SYNC_UUID: 3668f735e363SLars Ellenberg case C_WF_BITMAP_T: 3669f735e363SLars Ellenberg case C_BEHIND: 3670f735e363SLars Ellenberg break; 3671f735e363SLars Ellenberg default: 3672f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 3673f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 3674f735e363SLars Ellenberg } 3675f735e363SLars Ellenberg 367673a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 367773a01a18SPhilipp Reisner 367881e84650SAndreas Gruenbacher return true; 367973a01a18SPhilipp Reisner } 368073a01a18SPhilipp Reisner 368102918be2SPhilipp Reisner typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, enum drbd_packets cmd, unsigned int to_receive); 3682b411b363SPhilipp Reisner 368302918be2SPhilipp Reisner struct data_cmd { 368402918be2SPhilipp Reisner int expect_payload; 368502918be2SPhilipp Reisner size_t pkt_size; 368602918be2SPhilipp Reisner drbd_cmd_handler_f function; 3687b411b363SPhilipp Reisner }; 3688b411b363SPhilipp Reisner 368902918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 369002918be2SPhilipp Reisner [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 369102918be2SPhilipp Reisner [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 369202918be2SPhilipp Reisner [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 369302918be2SPhilipp Reisner [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 369402918be2SPhilipp Reisner [P_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } , 369502918be2SPhilipp Reisner [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } , 369602918be2SPhilipp Reisner [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header80), receive_UnplugRemote }, 369702918be2SPhilipp Reisner [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 369802918be2SPhilipp Reisner [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 369902918be2SPhilipp Reisner [P_SYNC_PARAM] = { 1, sizeof(struct p_header80), receive_SyncParam }, 370002918be2SPhilipp Reisner [P_SYNC_PARAM89] = { 1, sizeof(struct p_header80), receive_SyncParam }, 370102918be2SPhilipp Reisner [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 370202918be2SPhilipp Reisner [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 370302918be2SPhilipp Reisner [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 370402918be2SPhilipp Reisner [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 370502918be2SPhilipp Reisner [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 370602918be2SPhilipp Reisner [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 370702918be2SPhilipp Reisner [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 370802918be2SPhilipp Reisner [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 370902918be2SPhilipp Reisner [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 371002918be2SPhilipp Reisner [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 371173a01a18SPhilipp Reisner [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 371202918be2SPhilipp Reisner /* anything missing from this table is in 371302918be2SPhilipp Reisner * the asender_tbl, see get_asender_cmd */ 371402918be2SPhilipp Reisner [P_MAX_CMD] = { 0, 0, NULL }, 371502918be2SPhilipp Reisner }; 371602918be2SPhilipp Reisner 371702918be2SPhilipp Reisner /* All handler functions that expect a sub-header get that sub-heder in 371802918be2SPhilipp Reisner mdev->data.rbuf.header.head.payload. 371902918be2SPhilipp Reisner 372002918be2SPhilipp Reisner Usually in mdev->data.rbuf.header.head the callback can find the usual 372102918be2SPhilipp Reisner p_header, but they may not rely on that. Since there is also p_header95 ! 372202918be2SPhilipp Reisner */ 3723b411b363SPhilipp Reisner 3724b411b363SPhilipp Reisner static void drbdd(struct drbd_conf *mdev) 3725b411b363SPhilipp Reisner { 372602918be2SPhilipp Reisner union p_header *header = &mdev->data.rbuf.header; 372702918be2SPhilipp Reisner unsigned int packet_size; 372802918be2SPhilipp Reisner enum drbd_packets cmd; 372902918be2SPhilipp Reisner size_t shs; /* sub header size */ 373002918be2SPhilipp Reisner int rv; 3731b411b363SPhilipp Reisner 3732b411b363SPhilipp Reisner while (get_t_state(&mdev->receiver) == Running) { 3733b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 373402918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &packet_size)) 373502918be2SPhilipp Reisner goto err_out; 373602918be2SPhilipp Reisner 373702918be2SPhilipp Reisner if (unlikely(cmd >= P_MAX_CMD || !drbd_cmd_handler[cmd].function)) { 373802918be2SPhilipp Reisner dev_err(DEV, "unknown packet type %d, l: %d!\n", cmd, packet_size); 373902918be2SPhilipp Reisner goto err_out; 37400b33a916SLars Ellenberg } 3741b411b363SPhilipp Reisner 374202918be2SPhilipp Reisner shs = drbd_cmd_handler[cmd].pkt_size - sizeof(union p_header); 3743c13f7e1aSLars Ellenberg if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) { 3744c13f7e1aSLars Ellenberg dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size); 3745c13f7e1aSLars Ellenberg goto err_out; 3746c13f7e1aSLars Ellenberg } 3747c13f7e1aSLars Ellenberg 3748c13f7e1aSLars Ellenberg if (shs) { 374902918be2SPhilipp Reisner rv = drbd_recv(mdev, &header->h80.payload, shs); 375002918be2SPhilipp Reisner if (unlikely(rv != shs)) { 37510ddc5549SLars Ellenberg if (!signal_pending(current)) 37520ddc5549SLars Ellenberg dev_warn(DEV, "short read while reading sub header: rv=%d\n", rv); 375302918be2SPhilipp Reisner goto err_out; 3754b411b363SPhilipp Reisner } 375502918be2SPhilipp Reisner } 375602918be2SPhilipp Reisner 375702918be2SPhilipp Reisner rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs); 375802918be2SPhilipp Reisner 375902918be2SPhilipp Reisner if (unlikely(!rv)) { 3760b411b363SPhilipp Reisner dev_err(DEV, "error receiving %s, l: %d!\n", 376102918be2SPhilipp Reisner cmdname(cmd), packet_size); 376202918be2SPhilipp Reisner goto err_out; 3763b411b363SPhilipp Reisner } 3764b411b363SPhilipp Reisner } 376502918be2SPhilipp Reisner 376602918be2SPhilipp Reisner if (0) { 376702918be2SPhilipp Reisner err_out: 3768b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3769b411b363SPhilipp Reisner } 3770856c50c7SLars Ellenberg /* If we leave here, we probably want to update at least the 3771856c50c7SLars Ellenberg * "Connected" indicator on stable storage. Do so explicitly here. */ 3772856c50c7SLars Ellenberg drbd_md_sync(mdev); 3773b411b363SPhilipp Reisner } 3774b411b363SPhilipp Reisner 3775b411b363SPhilipp Reisner void drbd_flush_workqueue(struct drbd_conf *mdev) 3776b411b363SPhilipp Reisner { 3777b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 3778b411b363SPhilipp Reisner 3779b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 3780b411b363SPhilipp Reisner init_completion(&barr.done); 3781b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, &barr.w); 3782b411b363SPhilipp Reisner wait_for_completion(&barr.done); 3783b411b363SPhilipp Reisner } 3784b411b363SPhilipp Reisner 3785f70b3511SPhilipp Reisner void drbd_free_tl_hash(struct drbd_conf *mdev) 3786f70b3511SPhilipp Reisner { 3787f70b3511SPhilipp Reisner struct hlist_head *h; 3788f70b3511SPhilipp Reisner 3789f70b3511SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3790f70b3511SPhilipp Reisner 3791f70b3511SPhilipp Reisner if (!mdev->tl_hash || mdev->state.conn != C_STANDALONE) { 3792f70b3511SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3793f70b3511SPhilipp Reisner return; 3794f70b3511SPhilipp Reisner } 3795f70b3511SPhilipp Reisner /* paranoia code */ 3796f70b3511SPhilipp Reisner for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++) 3797f70b3511SPhilipp Reisner if (h->first) 3798f70b3511SPhilipp Reisner dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n", 3799f70b3511SPhilipp Reisner (int)(h - mdev->ee_hash), h->first); 3800f70b3511SPhilipp Reisner kfree(mdev->ee_hash); 3801f70b3511SPhilipp Reisner mdev->ee_hash = NULL; 3802f70b3511SPhilipp Reisner mdev->ee_hash_s = 0; 3803f70b3511SPhilipp Reisner 3804f70b3511SPhilipp Reisner /* paranoia code */ 3805f70b3511SPhilipp Reisner for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++) 3806f70b3511SPhilipp Reisner if (h->first) 3807f70b3511SPhilipp Reisner dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n", 3808f70b3511SPhilipp Reisner (int)(h - mdev->tl_hash), h->first); 3809f70b3511SPhilipp Reisner kfree(mdev->tl_hash); 3810f70b3511SPhilipp Reisner mdev->tl_hash = NULL; 3811f70b3511SPhilipp Reisner mdev->tl_hash_s = 0; 3812f70b3511SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3813f70b3511SPhilipp Reisner } 3814f70b3511SPhilipp Reisner 3815b411b363SPhilipp Reisner static void drbd_disconnect(struct drbd_conf *mdev) 3816b411b363SPhilipp Reisner { 3817b411b363SPhilipp Reisner enum drbd_fencing_p fp; 3818b411b363SPhilipp Reisner union drbd_state os, ns; 3819b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 3820b411b363SPhilipp Reisner unsigned int i; 3821b411b363SPhilipp Reisner 3822b411b363SPhilipp Reisner if (mdev->state.conn == C_STANDALONE) 3823b411b363SPhilipp Reisner return; 3824b411b363SPhilipp Reisner 3825545752d5SLars Ellenberg /* We are about to start the cleanup after connection loss. 3826545752d5SLars Ellenberg * Make sure drbd_make_request knows about that. 3827545752d5SLars Ellenberg * Usually we should be in some network failure state already, 3828545752d5SLars Ellenberg * but just in case we are not, we fix it up here. 3829545752d5SLars Ellenberg */ 3830545752d5SLars Ellenberg drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); 3831545752d5SLars Ellenberg 3832b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 3833b411b363SPhilipp Reisner drbd_thread_stop(&mdev->asender); 3834b411b363SPhilipp Reisner drbd_free_sock(mdev); 3835b411b363SPhilipp Reisner 383685719573SPhilipp Reisner /* wait for current activity to cease. */ 3837b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3838b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 3839b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 3840b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 3841b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3842b411b363SPhilipp Reisner 3843b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 3844b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 3845b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 3846b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 3847b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 3848b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 3849b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 3850b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 3851b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 3852b411b363SPhilipp Reisner * on the fly. */ 3853b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 3854b411b363SPhilipp Reisner mdev->rs_total = 0; 3855b411b363SPhilipp Reisner mdev->rs_failed = 0; 3856b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 3857b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 3858b411b363SPhilipp Reisner 3859b411b363SPhilipp Reisner /* make sure syncer is stopped and w_resume_next_sg queued */ 3860b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 3861b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 3862b411b363SPhilipp Reisner 3863b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 3864b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 3865b411b363SPhilipp Reisner * to be "canceled" */ 3866b411b363SPhilipp Reisner drbd_flush_workqueue(mdev); 3867b411b363SPhilipp Reisner 3868b411b363SPhilipp Reisner /* This also does reclaim_net_ee(). If we do this too early, we might 3869b411b363SPhilipp Reisner * miss some resync ee and pages.*/ 3870b411b363SPhilipp Reisner drbd_process_done_ee(mdev); 3871b411b363SPhilipp Reisner 3872b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3873b411b363SPhilipp Reisner mdev->p_uuid = NULL; 3874b411b363SPhilipp Reisner 3875fb22c402SPhilipp Reisner if (!is_susp(mdev->state)) 3876b411b363SPhilipp Reisner tl_clear(mdev); 3877b411b363SPhilipp Reisner 3878b411b363SPhilipp Reisner dev_info(DEV, "Connection closed\n"); 3879b411b363SPhilipp Reisner 3880b411b363SPhilipp Reisner drbd_md_sync(mdev); 3881b411b363SPhilipp Reisner 3882b411b363SPhilipp Reisner fp = FP_DONT_CARE; 3883b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3884b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 3885b411b363SPhilipp Reisner put_ldev(mdev); 3886b411b363SPhilipp Reisner } 3887b411b363SPhilipp Reisner 388887f7be4cSPhilipp Reisner if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) 388987f7be4cSPhilipp Reisner drbd_try_outdate_peer_async(mdev); 3890b411b363SPhilipp Reisner 3891b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3892b411b363SPhilipp Reisner os = mdev->state; 3893b411b363SPhilipp Reisner if (os.conn >= C_UNCONNECTED) { 3894b411b363SPhilipp Reisner /* Do not restart in case we are C_DISCONNECTING */ 3895b411b363SPhilipp Reisner ns = os; 3896b411b363SPhilipp Reisner ns.conn = C_UNCONNECTED; 3897b411b363SPhilipp Reisner rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 3898b411b363SPhilipp Reisner } 3899b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3900b411b363SPhilipp Reisner 3901b411b363SPhilipp Reisner if (os.conn == C_DISCONNECTING) { 390284dfb9f5SPhilipp Reisner wait_event(mdev->net_cnt_wait, atomic_read(&mdev->net_cnt) == 0); 3903b411b363SPhilipp Reisner 3904b411b363SPhilipp Reisner crypto_free_hash(mdev->cram_hmac_tfm); 3905b411b363SPhilipp Reisner mdev->cram_hmac_tfm = NULL; 3906b411b363SPhilipp Reisner 3907b411b363SPhilipp Reisner kfree(mdev->net_conf); 3908b411b363SPhilipp Reisner mdev->net_conf = NULL; 3909b411b363SPhilipp Reisner drbd_request_state(mdev, NS(conn, C_STANDALONE)); 3910b411b363SPhilipp Reisner } 3911b411b363SPhilipp Reisner 391220ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 391320ceb2b2SLars Ellenberg * if any. */ 391420ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 391520ceb2b2SLars Ellenberg 3916b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 3917b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 3918b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 3919b411b363SPhilipp Reisner * 3920b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 3921b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 3922b411b363SPhilipp Reisner */ 3923b411b363SPhilipp Reisner i = drbd_release_ee(mdev, &mdev->net_ee); 3924b411b363SPhilipp Reisner if (i) 3925b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 3926435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 3927435f0740SLars Ellenberg if (i) 3928435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 3929b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 3930b411b363SPhilipp Reisner if (i) 393145bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 3932b411b363SPhilipp Reisner 3933b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 3934b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 3935b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 3936b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 3937b411b363SPhilipp Reisner 3938b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 3939b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 3940b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 3941b411b363SPhilipp Reisner } 3942b411b363SPhilipp Reisner 3943b411b363SPhilipp Reisner /* 3944b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 3945b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 3946b411b363SPhilipp Reisner * 3947b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 3948b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 3949b411b363SPhilipp Reisner * 3950b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 3951b411b363SPhilipp Reisner */ 3952b411b363SPhilipp Reisner static int drbd_send_handshake(struct drbd_conf *mdev) 3953b411b363SPhilipp Reisner { 3954b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3955b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.sbuf.handshake; 3956b411b363SPhilipp Reisner int ok; 3957b411b363SPhilipp Reisner 3958b411b363SPhilipp Reisner if (mutex_lock_interruptible(&mdev->data.mutex)) { 3959b411b363SPhilipp Reisner dev_err(DEV, "interrupted during initial handshake\n"); 3960b411b363SPhilipp Reisner return 0; /* interrupted. not ok. */ 3961b411b363SPhilipp Reisner } 3962b411b363SPhilipp Reisner 3963b411b363SPhilipp Reisner if (mdev->data.socket == NULL) { 3964b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3965b411b363SPhilipp Reisner return 0; 3966b411b363SPhilipp Reisner } 3967b411b363SPhilipp Reisner 3968b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 3969b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 3970b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 3971b411b363SPhilipp Reisner ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE, 39720b70a13dSPhilipp Reisner (struct p_header80 *)p, sizeof(*p), 0 ); 3973b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3974b411b363SPhilipp Reisner return ok; 3975b411b363SPhilipp Reisner } 3976b411b363SPhilipp Reisner 3977b411b363SPhilipp Reisner /* 3978b411b363SPhilipp Reisner * return values: 3979b411b363SPhilipp Reisner * 1 yes, we have a valid connection 3980b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 3981b411b363SPhilipp Reisner * -1 peer talks different language, 3982b411b363SPhilipp Reisner * no point in trying again, please go standalone. 3983b411b363SPhilipp Reisner */ 3984b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev) 3985b411b363SPhilipp Reisner { 3986b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3987b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.rbuf.handshake; 398802918be2SPhilipp Reisner const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80); 398902918be2SPhilipp Reisner unsigned int length; 399002918be2SPhilipp Reisner enum drbd_packets cmd; 3991b411b363SPhilipp Reisner int rv; 3992b411b363SPhilipp Reisner 3993b411b363SPhilipp Reisner rv = drbd_send_handshake(mdev); 3994b411b363SPhilipp Reisner if (!rv) 3995b411b363SPhilipp Reisner return 0; 3996b411b363SPhilipp Reisner 399702918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 3998b411b363SPhilipp Reisner if (!rv) 3999b411b363SPhilipp Reisner return 0; 4000b411b363SPhilipp Reisner 400102918be2SPhilipp Reisner if (cmd != P_HAND_SHAKE) { 4002b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", 400302918be2SPhilipp Reisner cmdname(cmd), cmd); 4004b411b363SPhilipp Reisner return -1; 4005b411b363SPhilipp Reisner } 4006b411b363SPhilipp Reisner 400702918be2SPhilipp Reisner if (length != expect) { 4008b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake length: %u, received: %u\n", 400902918be2SPhilipp Reisner expect, length); 4010b411b363SPhilipp Reisner return -1; 4011b411b363SPhilipp Reisner } 4012b411b363SPhilipp Reisner 4013b411b363SPhilipp Reisner rv = drbd_recv(mdev, &p->head.payload, expect); 4014b411b363SPhilipp Reisner 4015b411b363SPhilipp Reisner if (rv != expect) { 40160ddc5549SLars Ellenberg if (!signal_pending(current)) 40170ddc5549SLars Ellenberg dev_warn(DEV, "short read receiving handshake packet: l=%u\n", rv); 4018b411b363SPhilipp Reisner return 0; 4019b411b363SPhilipp Reisner } 4020b411b363SPhilipp Reisner 4021b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 4022b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 4023b411b363SPhilipp Reisner if (p->protocol_max == 0) 4024b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 4025b411b363SPhilipp Reisner 4026b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 4027b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 4028b411b363SPhilipp Reisner goto incompat; 4029b411b363SPhilipp Reisner 4030b411b363SPhilipp Reisner mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 4031b411b363SPhilipp Reisner 4032b411b363SPhilipp Reisner dev_info(DEV, "Handshake successful: " 4033b411b363SPhilipp Reisner "Agreed network protocol version %d\n", mdev->agreed_pro_version); 4034b411b363SPhilipp Reisner 4035b411b363SPhilipp Reisner return 1; 4036b411b363SPhilipp Reisner 4037b411b363SPhilipp Reisner incompat: 4038b411b363SPhilipp Reisner dev_err(DEV, "incompatible DRBD dialects: " 4039b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 4040b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 4041b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 4042b411b363SPhilipp Reisner return -1; 4043b411b363SPhilipp Reisner } 4044b411b363SPhilipp Reisner 4045b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 4046b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 4047b411b363SPhilipp Reisner { 4048b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 4049b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 4050b10d96cbSJohannes Thoma return -1; 4051b411b363SPhilipp Reisner } 4052b411b363SPhilipp Reisner #else 4053b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4054b10d96cbSJohannes Thoma 4055b10d96cbSJohannes Thoma /* Return value: 4056b10d96cbSJohannes Thoma 1 - auth succeeded, 4057b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4058b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4059b10d96cbSJohannes Thoma */ 4060b10d96cbSJohannes Thoma 4061b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 4062b411b363SPhilipp Reisner { 4063b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4064b411b363SPhilipp Reisner struct scatterlist sg; 4065b411b363SPhilipp Reisner char *response = NULL; 4066b411b363SPhilipp Reisner char *right_response = NULL; 4067b411b363SPhilipp Reisner char *peers_ch = NULL; 4068b411b363SPhilipp Reisner unsigned int key_len = strlen(mdev->net_conf->shared_secret); 4069b411b363SPhilipp Reisner unsigned int resp_size; 4070b411b363SPhilipp Reisner struct hash_desc desc; 407102918be2SPhilipp Reisner enum drbd_packets cmd; 407202918be2SPhilipp Reisner unsigned int length; 4073b411b363SPhilipp Reisner int rv; 4074b411b363SPhilipp Reisner 4075b411b363SPhilipp Reisner desc.tfm = mdev->cram_hmac_tfm; 4076b411b363SPhilipp Reisner desc.flags = 0; 4077b411b363SPhilipp Reisner 4078b411b363SPhilipp Reisner rv = crypto_hash_setkey(mdev->cram_hmac_tfm, 4079b411b363SPhilipp Reisner (u8 *)mdev->net_conf->shared_secret, key_len); 4080b411b363SPhilipp Reisner if (rv) { 4081b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); 4082b10d96cbSJohannes Thoma rv = -1; 4083b411b363SPhilipp Reisner goto fail; 4084b411b363SPhilipp Reisner } 4085b411b363SPhilipp Reisner 4086b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4087b411b363SPhilipp Reisner 4088b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); 4089b411b363SPhilipp Reisner if (!rv) 4090b411b363SPhilipp Reisner goto fail; 4091b411b363SPhilipp Reisner 409202918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4093b411b363SPhilipp Reisner if (!rv) 4094b411b363SPhilipp Reisner goto fail; 4095b411b363SPhilipp Reisner 409602918be2SPhilipp Reisner if (cmd != P_AUTH_CHALLENGE) { 4097b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", 409802918be2SPhilipp Reisner cmdname(cmd), cmd); 4099b411b363SPhilipp Reisner rv = 0; 4100b411b363SPhilipp Reisner goto fail; 4101b411b363SPhilipp Reisner } 4102b411b363SPhilipp Reisner 410302918be2SPhilipp Reisner if (length > CHALLENGE_LEN * 2) { 4104b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge payload too big.\n"); 4105b10d96cbSJohannes Thoma rv = -1; 4106b411b363SPhilipp Reisner goto fail; 4107b411b363SPhilipp Reisner } 4108b411b363SPhilipp Reisner 410902918be2SPhilipp Reisner peers_ch = kmalloc(length, GFP_NOIO); 4110b411b363SPhilipp Reisner if (peers_ch == NULL) { 4111b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of peers_ch failed\n"); 4112b10d96cbSJohannes Thoma rv = -1; 4113b411b363SPhilipp Reisner goto fail; 4114b411b363SPhilipp Reisner } 4115b411b363SPhilipp Reisner 411602918be2SPhilipp Reisner rv = drbd_recv(mdev, peers_ch, length); 4117b411b363SPhilipp Reisner 411802918be2SPhilipp Reisner if (rv != length) { 41190ddc5549SLars Ellenberg if (!signal_pending(current)) 41200ddc5549SLars Ellenberg dev_warn(DEV, "short read AuthChallenge: l=%u\n", rv); 4121b411b363SPhilipp Reisner rv = 0; 4122b411b363SPhilipp Reisner goto fail; 4123b411b363SPhilipp Reisner } 4124b411b363SPhilipp Reisner 4125b411b363SPhilipp Reisner resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm); 4126b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4127b411b363SPhilipp Reisner if (response == NULL) { 4128b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of response failed\n"); 4129b10d96cbSJohannes Thoma rv = -1; 4130b411b363SPhilipp Reisner goto fail; 4131b411b363SPhilipp Reisner } 4132b411b363SPhilipp Reisner 4133b411b363SPhilipp Reisner sg_init_table(&sg, 1); 413402918be2SPhilipp Reisner sg_set_buf(&sg, peers_ch, length); 4135b411b363SPhilipp Reisner 4136b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4137b411b363SPhilipp Reisner if (rv) { 4138b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4139b10d96cbSJohannes Thoma rv = -1; 4140b411b363SPhilipp Reisner goto fail; 4141b411b363SPhilipp Reisner } 4142b411b363SPhilipp Reisner 4143b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); 4144b411b363SPhilipp Reisner if (!rv) 4145b411b363SPhilipp Reisner goto fail; 4146b411b363SPhilipp Reisner 414702918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4148b411b363SPhilipp Reisner if (!rv) 4149b411b363SPhilipp Reisner goto fail; 4150b411b363SPhilipp Reisner 415102918be2SPhilipp Reisner if (cmd != P_AUTH_RESPONSE) { 4152b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", 415302918be2SPhilipp Reisner cmdname(cmd), cmd); 4154b411b363SPhilipp Reisner rv = 0; 4155b411b363SPhilipp Reisner goto fail; 4156b411b363SPhilipp Reisner } 4157b411b363SPhilipp Reisner 415802918be2SPhilipp Reisner if (length != resp_size) { 4159b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse payload of wrong size\n"); 4160b411b363SPhilipp Reisner rv = 0; 4161b411b363SPhilipp Reisner goto fail; 4162b411b363SPhilipp Reisner } 4163b411b363SPhilipp Reisner 4164b411b363SPhilipp Reisner rv = drbd_recv(mdev, response , resp_size); 4165b411b363SPhilipp Reisner 4166b411b363SPhilipp Reisner if (rv != resp_size) { 41670ddc5549SLars Ellenberg if (!signal_pending(current)) 41680ddc5549SLars Ellenberg dev_warn(DEV, "short read receiving AuthResponse: l=%u\n", rv); 4169b411b363SPhilipp Reisner rv = 0; 4170b411b363SPhilipp Reisner goto fail; 4171b411b363SPhilipp Reisner } 4172b411b363SPhilipp Reisner 4173b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 41742d1ee87dSJulia Lawall if (right_response == NULL) { 4175b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of right_response failed\n"); 4176b10d96cbSJohannes Thoma rv = -1; 4177b411b363SPhilipp Reisner goto fail; 4178b411b363SPhilipp Reisner } 4179b411b363SPhilipp Reisner 4180b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4181b411b363SPhilipp Reisner 4182b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4183b411b363SPhilipp Reisner if (rv) { 4184b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4185b10d96cbSJohannes Thoma rv = -1; 4186b411b363SPhilipp Reisner goto fail; 4187b411b363SPhilipp Reisner } 4188b411b363SPhilipp Reisner 4189b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4190b411b363SPhilipp Reisner 4191b411b363SPhilipp Reisner if (rv) 4192b411b363SPhilipp Reisner dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", 4193b411b363SPhilipp Reisner resp_size, mdev->net_conf->cram_hmac_alg); 4194b10d96cbSJohannes Thoma else 4195b10d96cbSJohannes Thoma rv = -1; 4196b411b363SPhilipp Reisner 4197b411b363SPhilipp Reisner fail: 4198b411b363SPhilipp Reisner kfree(peers_ch); 4199b411b363SPhilipp Reisner kfree(response); 4200b411b363SPhilipp Reisner kfree(right_response); 4201b411b363SPhilipp Reisner 4202b411b363SPhilipp Reisner return rv; 4203b411b363SPhilipp Reisner } 4204b411b363SPhilipp Reisner #endif 4205b411b363SPhilipp Reisner 4206b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4207b411b363SPhilipp Reisner { 4208b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 4209b411b363SPhilipp Reisner unsigned int minor = mdev_to_minor(mdev); 4210b411b363SPhilipp Reisner int h; 4211b411b363SPhilipp Reisner 4212b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_receiver", minor); 4213b411b363SPhilipp Reisner 4214b411b363SPhilipp Reisner dev_info(DEV, "receiver (re)started\n"); 4215b411b363SPhilipp Reisner 4216b411b363SPhilipp Reisner do { 4217b411b363SPhilipp Reisner h = drbd_connect(mdev); 4218b411b363SPhilipp Reisner if (h == 0) { 4219b411b363SPhilipp Reisner drbd_disconnect(mdev); 422020ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4221b411b363SPhilipp Reisner } 4222b411b363SPhilipp Reisner if (h == -1) { 4223b411b363SPhilipp Reisner dev_warn(DEV, "Discarding network configuration.\n"); 4224b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4225b411b363SPhilipp Reisner } 4226b411b363SPhilipp Reisner } while (h == 0); 4227b411b363SPhilipp Reisner 4228b411b363SPhilipp Reisner if (h > 0) { 4229b411b363SPhilipp Reisner if (get_net_conf(mdev)) { 4230b411b363SPhilipp Reisner drbdd(mdev); 4231b411b363SPhilipp Reisner put_net_conf(mdev); 4232b411b363SPhilipp Reisner } 4233b411b363SPhilipp Reisner } 4234b411b363SPhilipp Reisner 4235b411b363SPhilipp Reisner drbd_disconnect(mdev); 4236b411b363SPhilipp Reisner 4237b411b363SPhilipp Reisner dev_info(DEV, "receiver terminated\n"); 4238b411b363SPhilipp Reisner return 0; 4239b411b363SPhilipp Reisner } 4240b411b363SPhilipp Reisner 4241b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4242b411b363SPhilipp Reisner 42430b70a13dSPhilipp Reisner static int got_RqSReply(struct drbd_conf *mdev, struct p_header80 *h) 4244b411b363SPhilipp Reisner { 4245b411b363SPhilipp Reisner struct p_req_state_reply *p = (struct p_req_state_reply *)h; 4246b411b363SPhilipp Reisner 4247b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4248b411b363SPhilipp Reisner 4249b411b363SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4250b411b363SPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4251b411b363SPhilipp Reisner } else { 4252b411b363SPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4253b411b363SPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4254b411b363SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4255b411b363SPhilipp Reisner } 4256b411b363SPhilipp Reisner wake_up(&mdev->state_wait); 4257b411b363SPhilipp Reisner 425881e84650SAndreas Gruenbacher return true; 4259b411b363SPhilipp Reisner } 4260b411b363SPhilipp Reisner 42610b70a13dSPhilipp Reisner static int got_Ping(struct drbd_conf *mdev, struct p_header80 *h) 4262b411b363SPhilipp Reisner { 4263b411b363SPhilipp Reisner return drbd_send_ping_ack(mdev); 4264b411b363SPhilipp Reisner 4265b411b363SPhilipp Reisner } 4266b411b363SPhilipp Reisner 42670b70a13dSPhilipp Reisner static int got_PingAck(struct drbd_conf *mdev, struct p_header80 *h) 4268b411b363SPhilipp Reisner { 4269b411b363SPhilipp Reisner /* restore idle timeout */ 4270b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 4271309d1608SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags)) 4272309d1608SPhilipp Reisner wake_up(&mdev->misc_wait); 4273b411b363SPhilipp Reisner 427481e84650SAndreas Gruenbacher return true; 4275b411b363SPhilipp Reisner } 4276b411b363SPhilipp Reisner 42770b70a13dSPhilipp Reisner static int got_IsInSync(struct drbd_conf *mdev, struct p_header80 *h) 4278b411b363SPhilipp Reisner { 4279b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4280b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4281b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4282b411b363SPhilipp Reisner 4283b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 4284b411b363SPhilipp Reisner 4285b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4286b411b363SPhilipp Reisner 42871d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4288b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4289b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4290b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4291b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 42921d53f09eSLars Ellenberg put_ldev(mdev); 42931d53f09eSLars Ellenberg } 4294b411b363SPhilipp Reisner dec_rs_pending(mdev); 4295778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4296b411b363SPhilipp Reisner 429781e84650SAndreas Gruenbacher return true; 4298b411b363SPhilipp Reisner } 4299b411b363SPhilipp Reisner 4300b411b363SPhilipp Reisner /* when we receive the ACK for a write request, 4301b411b363SPhilipp Reisner * verify that we actually know about it */ 4302b411b363SPhilipp Reisner static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev, 4303b411b363SPhilipp Reisner u64 id, sector_t sector) 4304b411b363SPhilipp Reisner { 4305b411b363SPhilipp Reisner struct hlist_head *slot = tl_hash_slot(mdev, sector); 4306b411b363SPhilipp Reisner struct hlist_node *n; 4307b411b363SPhilipp Reisner struct drbd_request *req; 4308b411b363SPhilipp Reisner 430924c4830cSBart Van Assche hlist_for_each_entry(req, n, slot, collision) { 4310b411b363SPhilipp Reisner if ((unsigned long)req == (unsigned long)id) { 4311b411b363SPhilipp Reisner if (req->sector != sector) { 4312b411b363SPhilipp Reisner dev_err(DEV, "_ack_id_to_req: found req %p but it has " 4313b411b363SPhilipp Reisner "wrong sector (%llus versus %llus)\n", req, 4314b411b363SPhilipp Reisner (unsigned long long)req->sector, 4315b411b363SPhilipp Reisner (unsigned long long)sector); 4316b411b363SPhilipp Reisner break; 4317b411b363SPhilipp Reisner } 4318b411b363SPhilipp Reisner return req; 4319b411b363SPhilipp Reisner } 4320b411b363SPhilipp Reisner } 4321b411b363SPhilipp Reisner return NULL; 4322b411b363SPhilipp Reisner } 4323b411b363SPhilipp Reisner 4324b411b363SPhilipp Reisner typedef struct drbd_request *(req_validator_fn) 4325b411b363SPhilipp Reisner (struct drbd_conf *mdev, u64 id, sector_t sector); 4326b411b363SPhilipp Reisner 4327b411b363SPhilipp Reisner static int validate_req_change_req_state(struct drbd_conf *mdev, 4328b411b363SPhilipp Reisner u64 id, sector_t sector, req_validator_fn validator, 4329b411b363SPhilipp Reisner const char *func, enum drbd_req_event what) 4330b411b363SPhilipp Reisner { 4331b411b363SPhilipp Reisner struct drbd_request *req; 4332b411b363SPhilipp Reisner struct bio_and_error m; 4333b411b363SPhilipp Reisner 4334b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4335b411b363SPhilipp Reisner req = validator(mdev, id, sector); 4336b411b363SPhilipp Reisner if (unlikely(!req)) { 4337b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 43382deb8336SPhilipp Reisner 43392deb8336SPhilipp Reisner dev_err(DEV, "%s: failed to find req %p, sector %llus\n", func, 43402deb8336SPhilipp Reisner (void *)(unsigned long)id, (unsigned long long)sector); 434181e84650SAndreas Gruenbacher return false; 4342b411b363SPhilipp Reisner } 4343b411b363SPhilipp Reisner __req_mod(req, what, &m); 4344b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4345b411b363SPhilipp Reisner 4346b411b363SPhilipp Reisner if (m.bio) 4347b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 434881e84650SAndreas Gruenbacher return true; 4349b411b363SPhilipp Reisner } 4350b411b363SPhilipp Reisner 43510b70a13dSPhilipp Reisner static int got_BlockAck(struct drbd_conf *mdev, struct p_header80 *h) 4352b411b363SPhilipp Reisner { 4353b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4354b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4355b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4356b411b363SPhilipp Reisner enum drbd_req_event what; 4357b411b363SPhilipp Reisner 4358b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4359b411b363SPhilipp Reisner 4360b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4361b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4362b411b363SPhilipp Reisner dec_rs_pending(mdev); 436381e84650SAndreas Gruenbacher return true; 4364b411b363SPhilipp Reisner } 4365b411b363SPhilipp Reisner switch (be16_to_cpu(h->command)) { 4366b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 4367b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4368b411b363SPhilipp Reisner what = write_acked_by_peer_and_sis; 4369b411b363SPhilipp Reisner break; 4370b411b363SPhilipp Reisner case P_WRITE_ACK: 4371b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4372b411b363SPhilipp Reisner what = write_acked_by_peer; 4373b411b363SPhilipp Reisner break; 4374b411b363SPhilipp Reisner case P_RECV_ACK: 4375b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B); 4376b411b363SPhilipp Reisner what = recv_acked_by_peer; 4377b411b363SPhilipp Reisner break; 4378b411b363SPhilipp Reisner case P_DISCARD_ACK: 4379b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4380b411b363SPhilipp Reisner what = conflict_discarded_by_peer; 4381b411b363SPhilipp Reisner break; 4382b411b363SPhilipp Reisner default: 4383b411b363SPhilipp Reisner D_ASSERT(0); 438481e84650SAndreas Gruenbacher return false; 4385b411b363SPhilipp Reisner } 4386b411b363SPhilipp Reisner 4387b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4388b411b363SPhilipp Reisner _ack_id_to_req, __func__ , what); 4389b411b363SPhilipp Reisner } 4390b411b363SPhilipp Reisner 43910b70a13dSPhilipp Reisner static int got_NegAck(struct drbd_conf *mdev, struct p_header80 *h) 4392b411b363SPhilipp Reisner { 4393b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4394b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 43952deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 43962deb8336SPhilipp Reisner struct drbd_request *req; 43972deb8336SPhilipp Reisner struct bio_and_error m; 4398b411b363SPhilipp Reisner 4399b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4400b411b363SPhilipp Reisner 4401b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4402b411b363SPhilipp Reisner dec_rs_pending(mdev); 4403b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 440481e84650SAndreas Gruenbacher return true; 4405b411b363SPhilipp Reisner } 44062deb8336SPhilipp Reisner 44072deb8336SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 44082deb8336SPhilipp Reisner req = _ack_id_to_req(mdev, p->block_id, sector); 44092deb8336SPhilipp Reisner if (!req) { 44102deb8336SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 44112deb8336SPhilipp Reisner if (mdev->net_conf->wire_protocol == DRBD_PROT_A || 44122deb8336SPhilipp Reisner mdev->net_conf->wire_protocol == DRBD_PROT_B) { 44132deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 44142deb8336SPhilipp Reisner The master bio might already be completed, therefore the 44152deb8336SPhilipp Reisner request is no longer in the collision hash. 44162deb8336SPhilipp Reisner => Do not try to validate block_id as request. */ 44172deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 44182deb8336SPhilipp Reisner but then get a P_NEG_ACK after wards. */ 44192deb8336SPhilipp Reisner drbd_set_out_of_sync(mdev, sector, size); 44202deb8336SPhilipp Reisner return true; 44212deb8336SPhilipp Reisner } else { 44222deb8336SPhilipp Reisner dev_err(DEV, "%s: failed to find req %p, sector %llus\n", __func__, 44232deb8336SPhilipp Reisner (void *)(unsigned long)p->block_id, (unsigned long long)sector); 44242deb8336SPhilipp Reisner return false; 44252deb8336SPhilipp Reisner } 44262deb8336SPhilipp Reisner } 44272deb8336SPhilipp Reisner __req_mod(req, neg_acked, &m); 44282deb8336SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 44292deb8336SPhilipp Reisner 44302deb8336SPhilipp Reisner if (m.bio) 44312deb8336SPhilipp Reisner complete_master_bio(mdev, &m); 44322deb8336SPhilipp Reisner return true; 4433b411b363SPhilipp Reisner } 4434b411b363SPhilipp Reisner 44350b70a13dSPhilipp Reisner static int got_NegDReply(struct drbd_conf *mdev, struct p_header80 *h) 4436b411b363SPhilipp Reisner { 4437b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4438b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4439b411b363SPhilipp Reisner 4440b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4441b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4442b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4443b411b363SPhilipp Reisner 4444b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4445b411b363SPhilipp Reisner _ar_id_to_req, __func__ , neg_acked); 4446b411b363SPhilipp Reisner } 4447b411b363SPhilipp Reisner 44480b70a13dSPhilipp Reisner static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header80 *h) 4449b411b363SPhilipp Reisner { 4450b411b363SPhilipp Reisner sector_t sector; 4451b411b363SPhilipp Reisner int size; 4452b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4453b411b363SPhilipp Reisner 4454b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4455b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4456b411b363SPhilipp Reisner 4457b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4458b411b363SPhilipp Reisner 4459b411b363SPhilipp Reisner dec_rs_pending(mdev); 4460b411b363SPhilipp Reisner 4461b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4462b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4463d612d309SPhilipp Reisner switch (be16_to_cpu(h->command)) { 4464d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 4465b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4466d612d309SPhilipp Reisner case P_RS_CANCEL: 4467d612d309SPhilipp Reisner break; 4468d612d309SPhilipp Reisner default: 4469d612d309SPhilipp Reisner D_ASSERT(0); 4470d612d309SPhilipp Reisner put_ldev(mdev); 4471d612d309SPhilipp Reisner return false; 4472d612d309SPhilipp Reisner } 4473b411b363SPhilipp Reisner put_ldev(mdev); 4474b411b363SPhilipp Reisner } 4475b411b363SPhilipp Reisner 447681e84650SAndreas Gruenbacher return true; 4477b411b363SPhilipp Reisner } 4478b411b363SPhilipp Reisner 44790b70a13dSPhilipp Reisner static int got_BarrierAck(struct drbd_conf *mdev, struct p_header80 *h) 4480b411b363SPhilipp Reisner { 4481b411b363SPhilipp Reisner struct p_barrier_ack *p = (struct p_barrier_ack *)h; 4482b411b363SPhilipp Reisner 4483b411b363SPhilipp Reisner tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); 4484b411b363SPhilipp Reisner 4485c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 4486c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 4487e89868a0SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->flags)) { 4488370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 4489370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 4490c4752ef1SPhilipp Reisner } 4491c4752ef1SPhilipp Reisner 449281e84650SAndreas Gruenbacher return true; 4493b411b363SPhilipp Reisner } 4494b411b363SPhilipp Reisner 44950b70a13dSPhilipp Reisner static int got_OVResult(struct drbd_conf *mdev, struct p_header80 *h) 4496b411b363SPhilipp Reisner { 4497b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4498b411b363SPhilipp Reisner struct drbd_work *w; 4499b411b363SPhilipp Reisner sector_t sector; 4500b411b363SPhilipp Reisner int size; 4501b411b363SPhilipp Reisner 4502b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4503b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4504b411b363SPhilipp Reisner 4505b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4506b411b363SPhilipp Reisner 4507b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 4508b411b363SPhilipp Reisner drbd_ov_oos_found(mdev, sector, size); 4509b411b363SPhilipp Reisner else 4510b411b363SPhilipp Reisner ov_oos_print(mdev); 4511b411b363SPhilipp Reisner 45121d53f09eSLars Ellenberg if (!get_ldev(mdev)) 451381e84650SAndreas Gruenbacher return true; 45141d53f09eSLars Ellenberg 4515b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4516b411b363SPhilipp Reisner dec_rs_pending(mdev); 4517b411b363SPhilipp Reisner 4518ea5442afSLars Ellenberg --mdev->ov_left; 4519ea5442afSLars Ellenberg 4520ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 4521ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 4522ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 4523ea5442afSLars Ellenberg 4524ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 4525b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4526b411b363SPhilipp Reisner if (w) { 4527b411b363SPhilipp Reisner w->cb = w_ov_finished; 4528b411b363SPhilipp Reisner drbd_queue_work_front(&mdev->data.work, w); 4529b411b363SPhilipp Reisner } else { 4530b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 4531b411b363SPhilipp Reisner ov_oos_print(mdev); 4532b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4533b411b363SPhilipp Reisner } 4534b411b363SPhilipp Reisner } 45351d53f09eSLars Ellenberg put_ldev(mdev); 453681e84650SAndreas Gruenbacher return true; 4537b411b363SPhilipp Reisner } 4538b411b363SPhilipp Reisner 453902918be2SPhilipp Reisner static int got_skip(struct drbd_conf *mdev, struct p_header80 *h) 45400ced55a3SPhilipp Reisner { 454181e84650SAndreas Gruenbacher return true; 45420ced55a3SPhilipp Reisner } 45430ced55a3SPhilipp Reisner 4544b411b363SPhilipp Reisner struct asender_cmd { 4545b411b363SPhilipp Reisner size_t pkt_size; 45460b70a13dSPhilipp Reisner int (*process)(struct drbd_conf *mdev, struct p_header80 *h); 4547b411b363SPhilipp Reisner }; 4548b411b363SPhilipp Reisner 4549b411b363SPhilipp Reisner static struct asender_cmd *get_asender_cmd(int cmd) 4550b411b363SPhilipp Reisner { 4551b411b363SPhilipp Reisner static struct asender_cmd asender_tbl[] = { 4552b411b363SPhilipp Reisner /* anything missing from this table is in 4553b411b363SPhilipp Reisner * the drbd_cmd_handler (drbd_default_handler) table, 4554b411b363SPhilipp Reisner * see the beginning of drbdd() */ 45550b70a13dSPhilipp Reisner [P_PING] = { sizeof(struct p_header80), got_Ping }, 45560b70a13dSPhilipp Reisner [P_PING_ACK] = { sizeof(struct p_header80), got_PingAck }, 4557b411b363SPhilipp Reisner [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4558b411b363SPhilipp Reisner [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4559b411b363SPhilipp Reisner [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4560b411b363SPhilipp Reisner [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4561b411b363SPhilipp Reisner [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 4562b411b363SPhilipp Reisner [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 4563b411b363SPhilipp Reisner [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4564b411b363SPhilipp Reisner [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 4565b411b363SPhilipp Reisner [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 4566b411b363SPhilipp Reisner [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 4567b411b363SPhilipp Reisner [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 456802918be2SPhilipp Reisner [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 4569d612d309SPhilipp Reisner [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4570b411b363SPhilipp Reisner [P_MAX_CMD] = { 0, NULL }, 4571b411b363SPhilipp Reisner }; 4572b411b363SPhilipp Reisner if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) 4573b411b363SPhilipp Reisner return NULL; 4574b411b363SPhilipp Reisner return &asender_tbl[cmd]; 4575b411b363SPhilipp Reisner } 4576b411b363SPhilipp Reisner 4577b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4578b411b363SPhilipp Reisner { 4579b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 458002918be2SPhilipp Reisner struct p_header80 *h = &mdev->meta.rbuf.header.h80; 4581b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 4582b411b363SPhilipp Reisner 4583b411b363SPhilipp Reisner int rv, len; 4584b411b363SPhilipp Reisner void *buf = h; 4585b411b363SPhilipp Reisner int received = 0; 45860b70a13dSPhilipp Reisner int expect = sizeof(struct p_header80); 4587b411b363SPhilipp Reisner int empty; 4588f36af18cSLars Ellenberg int ping_timeout_active = 0; 4589b411b363SPhilipp Reisner 4590b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); 4591b411b363SPhilipp Reisner 4592b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 4593b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 4594b411b363SPhilipp Reisner 4595b411b363SPhilipp Reisner while (get_t_state(thi) == Running) { 4596b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 4597b411b363SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &mdev->flags)) { 4598b411b363SPhilipp Reisner ERR_IF(!drbd_send_ping(mdev)) goto reconnect; 4599b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = 4600b411b363SPhilipp Reisner mdev->net_conf->ping_timeo*HZ/10; 4601f36af18cSLars Ellenberg ping_timeout_active = 1; 4602b411b363SPhilipp Reisner } 4603b411b363SPhilipp Reisner 4604b411b363SPhilipp Reisner /* conditionally cork; 4605b411b363SPhilipp Reisner * it may hurt latency if we cork without much to send */ 4606b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork && 4607b411b363SPhilipp Reisner 3 < atomic_read(&mdev->unacked_cnt)) 4608b411b363SPhilipp Reisner drbd_tcp_cork(mdev->meta.socket); 4609b411b363SPhilipp Reisner while (1) { 4610b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4611b411b363SPhilipp Reisner flush_signals(current); 46120f8488e1SLars Ellenberg if (!drbd_process_done_ee(mdev)) 4613b411b363SPhilipp Reisner goto reconnect; 4614b411b363SPhilipp Reisner /* to avoid race with newly queued ACKs */ 4615b411b363SPhilipp Reisner set_bit(SIGNAL_ASENDER, &mdev->flags); 4616b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4617b411b363SPhilipp Reisner empty = list_empty(&mdev->done_ee); 4618b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4619b411b363SPhilipp Reisner /* new ack may have been queued right here, 4620b411b363SPhilipp Reisner * but then there is also a signal pending, 4621b411b363SPhilipp Reisner * and we start over... */ 4622b411b363SPhilipp Reisner if (empty) 4623b411b363SPhilipp Reisner break; 4624b411b363SPhilipp Reisner } 4625b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 4626b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork) 4627b411b363SPhilipp Reisner drbd_tcp_uncork(mdev->meta.socket); 4628b411b363SPhilipp Reisner 4629b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 4630b411b363SPhilipp Reisner if (signal_pending(current)) 4631b411b363SPhilipp Reisner continue; 4632b411b363SPhilipp Reisner 4633b411b363SPhilipp Reisner rv = drbd_recv_short(mdev, mdev->meta.socket, 4634b411b363SPhilipp Reisner buf, expect-received, 0); 4635b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4636b411b363SPhilipp Reisner 4637b411b363SPhilipp Reisner flush_signals(current); 4638b411b363SPhilipp Reisner 4639b411b363SPhilipp Reisner /* Note: 4640b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 4641b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 4642b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 4643b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 4644b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 4645b411b363SPhilipp Reisner * rv == expected: full header or command 4646b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 4647b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 4648b411b363SPhilipp Reisner */ 4649b411b363SPhilipp Reisner if (likely(rv > 0)) { 4650b411b363SPhilipp Reisner received += rv; 4651b411b363SPhilipp Reisner buf += rv; 4652b411b363SPhilipp Reisner } else if (rv == 0) { 4653b411b363SPhilipp Reisner dev_err(DEV, "meta connection shut down by peer.\n"); 4654b411b363SPhilipp Reisner goto reconnect; 4655b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 4656cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 4657cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 4658cb6518cbSLars Ellenberg if (time_after(mdev->last_received, 4659cb6518cbSLars Ellenberg jiffies - mdev->meta.socket->sk->sk_rcvtimeo)) 4660cb6518cbSLars Ellenberg continue; 4661f36af18cSLars Ellenberg if (ping_timeout_active) { 4662b411b363SPhilipp Reisner dev_err(DEV, "PingAck did not arrive in time.\n"); 4663b411b363SPhilipp Reisner goto reconnect; 4664b411b363SPhilipp Reisner } 4665b411b363SPhilipp Reisner set_bit(SEND_PING, &mdev->flags); 4666b411b363SPhilipp Reisner continue; 4667b411b363SPhilipp Reisner } else if (rv == -EINTR) { 4668b411b363SPhilipp Reisner continue; 4669b411b363SPhilipp Reisner } else { 4670b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 4671b411b363SPhilipp Reisner goto reconnect; 4672b411b363SPhilipp Reisner } 4673b411b363SPhilipp Reisner 4674b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 4675b411b363SPhilipp Reisner if (unlikely(h->magic != BE_DRBD_MAGIC)) { 4676004352faSLars Ellenberg dev_err(DEV, "magic?? on meta m: 0x%08x c: %d l: %d\n", 4677004352faSLars Ellenberg be32_to_cpu(h->magic), 4678004352faSLars Ellenberg be16_to_cpu(h->command), 4679004352faSLars Ellenberg be16_to_cpu(h->length)); 4680b411b363SPhilipp Reisner goto reconnect; 4681b411b363SPhilipp Reisner } 4682b411b363SPhilipp Reisner cmd = get_asender_cmd(be16_to_cpu(h->command)); 4683b411b363SPhilipp Reisner len = be16_to_cpu(h->length); 4684b411b363SPhilipp Reisner if (unlikely(cmd == NULL)) { 4685004352faSLars Ellenberg dev_err(DEV, "unknown command?? on meta m: 0x%08x c: %d l: %d\n", 4686004352faSLars Ellenberg be32_to_cpu(h->magic), 4687004352faSLars Ellenberg be16_to_cpu(h->command), 4688004352faSLars Ellenberg be16_to_cpu(h->length)); 4689b411b363SPhilipp Reisner goto disconnect; 4690b411b363SPhilipp Reisner } 4691b411b363SPhilipp Reisner expect = cmd->pkt_size; 46920b70a13dSPhilipp Reisner ERR_IF(len != expect-sizeof(struct p_header80)) 4693b411b363SPhilipp Reisner goto reconnect; 4694b411b363SPhilipp Reisner } 4695b411b363SPhilipp Reisner if (received == expect) { 4696cb6518cbSLars Ellenberg mdev->last_received = jiffies; 4697b411b363SPhilipp Reisner D_ASSERT(cmd != NULL); 4698b411b363SPhilipp Reisner if (!cmd->process(mdev, h)) 4699b411b363SPhilipp Reisner goto reconnect; 4700b411b363SPhilipp Reisner 4701f36af18cSLars Ellenberg /* the idle_timeout (ping-int) 4702f36af18cSLars Ellenberg * has been restored in got_PingAck() */ 4703f36af18cSLars Ellenberg if (cmd == get_asender_cmd(P_PING_ACK)) 4704f36af18cSLars Ellenberg ping_timeout_active = 0; 4705f36af18cSLars Ellenberg 4706b411b363SPhilipp Reisner buf = h; 4707b411b363SPhilipp Reisner received = 0; 47080b70a13dSPhilipp Reisner expect = sizeof(struct p_header80); 4709b411b363SPhilipp Reisner cmd = NULL; 4710b411b363SPhilipp Reisner } 4711b411b363SPhilipp Reisner } 4712b411b363SPhilipp Reisner 4713b411b363SPhilipp Reisner if (0) { 4714b411b363SPhilipp Reisner reconnect: 4715b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); 4716856c50c7SLars Ellenberg drbd_md_sync(mdev); 4717b411b363SPhilipp Reisner } 4718b411b363SPhilipp Reisner if (0) { 4719b411b363SPhilipp Reisner disconnect: 4720b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4721856c50c7SLars Ellenberg drbd_md_sync(mdev); 4722b411b363SPhilipp Reisner } 4723b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4724b411b363SPhilipp Reisner 4725b411b363SPhilipp Reisner D_ASSERT(mdev->state.conn < C_CONNECTED); 4726b411b363SPhilipp Reisner dev_info(DEV, "asender terminated\n"); 4727b411b363SPhilipp Reisner 4728b411b363SPhilipp Reisner return 0; 4729b411b363SPhilipp Reisner } 4730