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 336b411b363SPhilipp Reisner INIT_HLIST_NODE(&e->colision); 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); 359b411b363SPhilipp Reisner D_ASSERT(hlist_unhashed(&e->colision)); 360b411b363SPhilipp Reisner mempool_free(e, drbd_ee_mempool); 361b411b363SPhilipp Reisner } 362b411b363SPhilipp Reisner 363b411b363SPhilipp Reisner int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list) 364b411b363SPhilipp Reisner { 365b411b363SPhilipp Reisner LIST_HEAD(work_list); 366b411b363SPhilipp Reisner struct drbd_epoch_entry *e, *t; 367b411b363SPhilipp Reisner int count = 0; 368435f0740SLars Ellenberg int is_net = list == &mdev->net_ee; 369b411b363SPhilipp Reisner 370b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 371b411b363SPhilipp Reisner list_splice_init(list, &work_list); 372b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 373b411b363SPhilipp Reisner 374b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &work_list, w.list) { 375435f0740SLars Ellenberg drbd_free_some_ee(mdev, e, is_net); 376b411b363SPhilipp Reisner count++; 377b411b363SPhilipp Reisner } 378b411b363SPhilipp Reisner return count; 379b411b363SPhilipp Reisner } 380b411b363SPhilipp Reisner 381b411b363SPhilipp Reisner 382b411b363SPhilipp Reisner /* 383b411b363SPhilipp Reisner * This function is called from _asender only_ 384b411b363SPhilipp Reisner * but see also comments in _req_mod(,barrier_acked) 385b411b363SPhilipp Reisner * and receive_Barrier. 386b411b363SPhilipp Reisner * 387b411b363SPhilipp Reisner * Move entries from net_ee to done_ee, if ready. 388b411b363SPhilipp Reisner * Grab done_ee, call all callbacks, free the entries. 389b411b363SPhilipp Reisner * The callbacks typically send out ACKs. 390b411b363SPhilipp Reisner */ 391b411b363SPhilipp Reisner static int drbd_process_done_ee(struct drbd_conf *mdev) 392b411b363SPhilipp Reisner { 393b411b363SPhilipp Reisner LIST_HEAD(work_list); 394b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 395b411b363SPhilipp Reisner struct drbd_epoch_entry *e, *t; 396b411b363SPhilipp Reisner int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS); 397b411b363SPhilipp Reisner 398b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 399b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 400b411b363SPhilipp Reisner list_splice_init(&mdev->done_ee, &work_list); 401b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 402b411b363SPhilipp Reisner 403b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &reclaimed, w.list) 404435f0740SLars Ellenberg drbd_free_net_ee(mdev, e); 405b411b363SPhilipp Reisner 406b411b363SPhilipp Reisner /* possible callbacks here: 407b411b363SPhilipp Reisner * e_end_block, and e_end_resync_block, e_send_discard_ack. 408b411b363SPhilipp Reisner * all ignore the last argument. 409b411b363SPhilipp Reisner */ 410b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &work_list, w.list) { 411b411b363SPhilipp Reisner /* list_del not necessary, next/prev members not touched */ 412b411b363SPhilipp Reisner ok = e->w.cb(mdev, &e->w, !ok) && ok; 413b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 414b411b363SPhilipp Reisner } 415b411b363SPhilipp Reisner wake_up(&mdev->ee_wait); 416b411b363SPhilipp Reisner 417b411b363SPhilipp Reisner return ok; 418b411b363SPhilipp Reisner } 419b411b363SPhilipp Reisner 420b411b363SPhilipp Reisner void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 421b411b363SPhilipp Reisner { 422b411b363SPhilipp Reisner DEFINE_WAIT(wait); 423b411b363SPhilipp Reisner 424b411b363SPhilipp Reisner /* avoids spin_lock/unlock 425b411b363SPhilipp Reisner * and calling prepare_to_wait in the fast path */ 426b411b363SPhilipp Reisner while (!list_empty(head)) { 427b411b363SPhilipp Reisner prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); 428b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4297eaceaccSJens Axboe io_schedule(); 430b411b363SPhilipp Reisner finish_wait(&mdev->ee_wait, &wait); 431b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 432b411b363SPhilipp Reisner } 433b411b363SPhilipp Reisner } 434b411b363SPhilipp Reisner 435b411b363SPhilipp Reisner void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 436b411b363SPhilipp Reisner { 437b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 438b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, head); 439b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 440b411b363SPhilipp Reisner } 441b411b363SPhilipp Reisner 442b411b363SPhilipp Reisner /* see also kernel_accept; which is only present since 2.6.18. 443b411b363SPhilipp Reisner * also we want to log which part of it failed, exactly */ 444b411b363SPhilipp Reisner static int drbd_accept(struct drbd_conf *mdev, const char **what, 445b411b363SPhilipp Reisner struct socket *sock, struct socket **newsock) 446b411b363SPhilipp Reisner { 447b411b363SPhilipp Reisner struct sock *sk = sock->sk; 448b411b363SPhilipp Reisner int err = 0; 449b411b363SPhilipp Reisner 450b411b363SPhilipp Reisner *what = "listen"; 451b411b363SPhilipp Reisner err = sock->ops->listen(sock, 5); 452b411b363SPhilipp Reisner if (err < 0) 453b411b363SPhilipp Reisner goto out; 454b411b363SPhilipp Reisner 455b411b363SPhilipp Reisner *what = "sock_create_lite"; 456b411b363SPhilipp Reisner err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 457b411b363SPhilipp Reisner newsock); 458b411b363SPhilipp Reisner if (err < 0) 459b411b363SPhilipp Reisner goto out; 460b411b363SPhilipp Reisner 461b411b363SPhilipp Reisner *what = "accept"; 462b411b363SPhilipp Reisner err = sock->ops->accept(sock, *newsock, 0); 463b411b363SPhilipp Reisner if (err < 0) { 464b411b363SPhilipp Reisner sock_release(*newsock); 465b411b363SPhilipp Reisner *newsock = NULL; 466b411b363SPhilipp Reisner goto out; 467b411b363SPhilipp Reisner } 468b411b363SPhilipp Reisner (*newsock)->ops = sock->ops; 469b411b363SPhilipp Reisner 470b411b363SPhilipp Reisner out: 471b411b363SPhilipp Reisner return err; 472b411b363SPhilipp Reisner } 473b411b363SPhilipp Reisner 474b411b363SPhilipp Reisner static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock, 475b411b363SPhilipp Reisner void *buf, size_t size, int flags) 476b411b363SPhilipp Reisner { 477b411b363SPhilipp Reisner mm_segment_t oldfs; 478b411b363SPhilipp Reisner struct kvec iov = { 479b411b363SPhilipp Reisner .iov_base = buf, 480b411b363SPhilipp Reisner .iov_len = size, 481b411b363SPhilipp Reisner }; 482b411b363SPhilipp Reisner struct msghdr msg = { 483b411b363SPhilipp Reisner .msg_iovlen = 1, 484b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 485b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 486b411b363SPhilipp Reisner }; 487b411b363SPhilipp Reisner int rv; 488b411b363SPhilipp Reisner 489b411b363SPhilipp Reisner oldfs = get_fs(); 490b411b363SPhilipp Reisner set_fs(KERNEL_DS); 491b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 492b411b363SPhilipp Reisner set_fs(oldfs); 493b411b363SPhilipp Reisner 494b411b363SPhilipp Reisner return rv; 495b411b363SPhilipp Reisner } 496b411b363SPhilipp Reisner 497b411b363SPhilipp Reisner static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size) 498b411b363SPhilipp Reisner { 499b411b363SPhilipp Reisner mm_segment_t oldfs; 500b411b363SPhilipp Reisner struct kvec iov = { 501b411b363SPhilipp Reisner .iov_base = buf, 502b411b363SPhilipp Reisner .iov_len = size, 503b411b363SPhilipp Reisner }; 504b411b363SPhilipp Reisner struct msghdr msg = { 505b411b363SPhilipp Reisner .msg_iovlen = 1, 506b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 507b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 508b411b363SPhilipp Reisner }; 509b411b363SPhilipp Reisner int rv; 510b411b363SPhilipp Reisner 511b411b363SPhilipp Reisner oldfs = get_fs(); 512b411b363SPhilipp Reisner set_fs(KERNEL_DS); 513b411b363SPhilipp Reisner 514b411b363SPhilipp Reisner for (;;) { 515b411b363SPhilipp Reisner rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags); 516b411b363SPhilipp Reisner if (rv == size) 517b411b363SPhilipp Reisner break; 518b411b363SPhilipp Reisner 519b411b363SPhilipp Reisner /* Note: 520b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 521b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 522b411b363SPhilipp Reisner */ 523b411b363SPhilipp Reisner 524b411b363SPhilipp Reisner if (rv < 0) { 525b411b363SPhilipp Reisner if (rv == -ECONNRESET) 526b411b363SPhilipp Reisner dev_info(DEV, "sock was reset by peer\n"); 527b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 528b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 529b411b363SPhilipp Reisner break; 530b411b363SPhilipp Reisner } else if (rv == 0) { 531b411b363SPhilipp Reisner dev_info(DEV, "sock was shut down by peer\n"); 532b411b363SPhilipp Reisner break; 533b411b363SPhilipp Reisner } else { 534b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 535b411b363SPhilipp Reisner * after we read a partial message 536b411b363SPhilipp Reisner */ 537b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 538b411b363SPhilipp Reisner break; 539b411b363SPhilipp Reisner } 540b411b363SPhilipp Reisner }; 541b411b363SPhilipp Reisner 542b411b363SPhilipp Reisner set_fs(oldfs); 543b411b363SPhilipp Reisner 544b411b363SPhilipp Reisner if (rv != size) 545b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); 546b411b363SPhilipp Reisner 547b411b363SPhilipp Reisner return rv; 548b411b363SPhilipp Reisner } 549b411b363SPhilipp Reisner 5505dbf1673SLars Ellenberg /* quoting tcp(7): 5515dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5525dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5535dbf1673SLars Ellenberg * This is our wrapper to do so. 5545dbf1673SLars Ellenberg */ 5555dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 5565dbf1673SLars Ellenberg unsigned int rcv) 5575dbf1673SLars Ellenberg { 5585dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 5595dbf1673SLars Ellenberg if (snd) { 5605dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 5615dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 5625dbf1673SLars Ellenberg } 5635dbf1673SLars Ellenberg if (rcv) { 5645dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 5655dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 5665dbf1673SLars Ellenberg } 5675dbf1673SLars Ellenberg } 5685dbf1673SLars Ellenberg 569b411b363SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_conf *mdev) 570b411b363SPhilipp Reisner { 571b411b363SPhilipp Reisner const char *what; 572b411b363SPhilipp Reisner struct socket *sock; 573b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 574b411b363SPhilipp Reisner int err; 575b411b363SPhilipp Reisner int disconnect_on_error = 1; 576b411b363SPhilipp Reisner 577b411b363SPhilipp Reisner if (!get_net_conf(mdev)) 578b411b363SPhilipp Reisner return NULL; 579b411b363SPhilipp Reisner 580b411b363SPhilipp Reisner what = "sock_create_kern"; 581b411b363SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, 582b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 583b411b363SPhilipp Reisner if (err < 0) { 584b411b363SPhilipp Reisner sock = NULL; 585b411b363SPhilipp Reisner goto out; 586b411b363SPhilipp Reisner } 587b411b363SPhilipp Reisner 588b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 589b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ; 5905dbf1673SLars Ellenberg drbd_setbufsize(sock, mdev->net_conf->sndbuf_size, 5915dbf1673SLars Ellenberg mdev->net_conf->rcvbuf_size); 592b411b363SPhilipp Reisner 593b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 594b411b363SPhilipp Reisner * for the outgoing connections. 595b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 596b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 597b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 598b411b363SPhilipp Reisner * a free one dynamically. 599b411b363SPhilipp Reisner */ 600b411b363SPhilipp Reisner memcpy(&src_in6, mdev->net_conf->my_addr, 601b411b363SPhilipp Reisner min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6))); 602b411b363SPhilipp Reisner if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6) 603b411b363SPhilipp Reisner src_in6.sin6_port = 0; 604b411b363SPhilipp Reisner else 605b411b363SPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 606b411b363SPhilipp Reisner 607b411b363SPhilipp Reisner what = "bind before connect"; 608b411b363SPhilipp Reisner err = sock->ops->bind(sock, 609b411b363SPhilipp Reisner (struct sockaddr *) &src_in6, 610b411b363SPhilipp Reisner mdev->net_conf->my_addr_len); 611b411b363SPhilipp Reisner if (err < 0) 612b411b363SPhilipp Reisner goto out; 613b411b363SPhilipp Reisner 614b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 615b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 616b411b363SPhilipp Reisner disconnect_on_error = 0; 617b411b363SPhilipp Reisner what = "connect"; 618b411b363SPhilipp Reisner err = sock->ops->connect(sock, 619b411b363SPhilipp Reisner (struct sockaddr *)mdev->net_conf->peer_addr, 620b411b363SPhilipp Reisner mdev->net_conf->peer_addr_len, 0); 621b411b363SPhilipp Reisner 622b411b363SPhilipp Reisner out: 623b411b363SPhilipp Reisner if (err < 0) { 624b411b363SPhilipp Reisner if (sock) { 625b411b363SPhilipp Reisner sock_release(sock); 626b411b363SPhilipp Reisner sock = NULL; 627b411b363SPhilipp Reisner } 628b411b363SPhilipp Reisner switch (-err) { 629b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 630b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 631b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 632b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 633b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 634b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 635b411b363SPhilipp Reisner disconnect_on_error = 0; 636b411b363SPhilipp Reisner break; 637b411b363SPhilipp Reisner default: 638b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 639b411b363SPhilipp Reisner } 640b411b363SPhilipp Reisner if (disconnect_on_error) 641b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 642b411b363SPhilipp Reisner } 643b411b363SPhilipp Reisner put_net_conf(mdev); 644b411b363SPhilipp Reisner return sock; 645b411b363SPhilipp Reisner } 646b411b363SPhilipp Reisner 647b411b363SPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev) 648b411b363SPhilipp Reisner { 649b411b363SPhilipp Reisner int timeo, err; 650b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 651b411b363SPhilipp Reisner const char *what; 652b411b363SPhilipp Reisner 653b411b363SPhilipp Reisner if (!get_net_conf(mdev)) 654b411b363SPhilipp Reisner return NULL; 655b411b363SPhilipp Reisner 656b411b363SPhilipp Reisner what = "sock_create_kern"; 657b411b363SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, 658b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 659b411b363SPhilipp Reisner if (err) { 660b411b363SPhilipp Reisner s_listen = NULL; 661b411b363SPhilipp Reisner goto out; 662b411b363SPhilipp Reisner } 663b411b363SPhilipp Reisner 664b411b363SPhilipp Reisner timeo = mdev->net_conf->try_connect_int * HZ; 665b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 666b411b363SPhilipp Reisner 667b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 668b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 669b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 6705dbf1673SLars Ellenberg drbd_setbufsize(s_listen, mdev->net_conf->sndbuf_size, 6715dbf1673SLars Ellenberg mdev->net_conf->rcvbuf_size); 672b411b363SPhilipp Reisner 673b411b363SPhilipp Reisner what = "bind before listen"; 674b411b363SPhilipp Reisner err = s_listen->ops->bind(s_listen, 675b411b363SPhilipp Reisner (struct sockaddr *) mdev->net_conf->my_addr, 676b411b363SPhilipp Reisner mdev->net_conf->my_addr_len); 677b411b363SPhilipp Reisner if (err < 0) 678b411b363SPhilipp Reisner goto out; 679b411b363SPhilipp Reisner 680b411b363SPhilipp Reisner err = drbd_accept(mdev, &what, s_listen, &s_estab); 681b411b363SPhilipp Reisner 682b411b363SPhilipp Reisner out: 683b411b363SPhilipp Reisner if (s_listen) 684b411b363SPhilipp Reisner sock_release(s_listen); 685b411b363SPhilipp Reisner if (err < 0) { 686b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 687b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 688b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 689b411b363SPhilipp Reisner } 690b411b363SPhilipp Reisner } 691b411b363SPhilipp Reisner put_net_conf(mdev); 692b411b363SPhilipp Reisner 693b411b363SPhilipp Reisner return s_estab; 694b411b363SPhilipp Reisner } 695b411b363SPhilipp Reisner 696b411b363SPhilipp Reisner static int drbd_send_fp(struct drbd_conf *mdev, 697b411b363SPhilipp Reisner struct socket *sock, enum drbd_packets cmd) 698b411b363SPhilipp Reisner { 69902918be2SPhilipp Reisner struct p_header80 *h = &mdev->data.sbuf.header.h80; 700b411b363SPhilipp Reisner 701b411b363SPhilipp Reisner return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0); 702b411b363SPhilipp Reisner } 703b411b363SPhilipp Reisner 704b411b363SPhilipp Reisner static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock) 705b411b363SPhilipp Reisner { 70602918be2SPhilipp Reisner struct p_header80 *h = &mdev->data.rbuf.header.h80; 707b411b363SPhilipp Reisner int rr; 708b411b363SPhilipp Reisner 709b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0); 710b411b363SPhilipp Reisner 711b411b363SPhilipp Reisner if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC) 712b411b363SPhilipp Reisner return be16_to_cpu(h->command); 713b411b363SPhilipp Reisner 714b411b363SPhilipp Reisner return 0xffff; 715b411b363SPhilipp Reisner } 716b411b363SPhilipp Reisner 717b411b363SPhilipp Reisner /** 718b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 719b411b363SPhilipp Reisner * @mdev: DRBD device. 720b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 721b411b363SPhilipp Reisner */ 722b411b363SPhilipp Reisner static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock) 723b411b363SPhilipp Reisner { 724b411b363SPhilipp Reisner int rr; 725b411b363SPhilipp Reisner char tb[4]; 726b411b363SPhilipp Reisner 727b411b363SPhilipp Reisner if (!*sock) 72881e84650SAndreas Gruenbacher return false; 729b411b363SPhilipp Reisner 730b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 731b411b363SPhilipp Reisner 732b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 73381e84650SAndreas Gruenbacher return true; 734b411b363SPhilipp Reisner } else { 735b411b363SPhilipp Reisner sock_release(*sock); 736b411b363SPhilipp Reisner *sock = NULL; 73781e84650SAndreas Gruenbacher return false; 738b411b363SPhilipp Reisner } 739b411b363SPhilipp Reisner } 740b411b363SPhilipp Reisner 741b411b363SPhilipp Reisner /* 742b411b363SPhilipp Reisner * return values: 743b411b363SPhilipp Reisner * 1 yes, we have a valid connection 744b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 745b411b363SPhilipp Reisner * -1 peer talks different language, 746b411b363SPhilipp Reisner * no point in trying again, please go standalone. 747b411b363SPhilipp Reisner * -2 We do not have a network config... 748b411b363SPhilipp Reisner */ 749b411b363SPhilipp Reisner static int drbd_connect(struct drbd_conf *mdev) 750b411b363SPhilipp Reisner { 751b411b363SPhilipp Reisner struct socket *s, *sock, *msock; 752b411b363SPhilipp Reisner int try, h, ok; 753b411b363SPhilipp Reisner 754b411b363SPhilipp Reisner D_ASSERT(!mdev->data.socket); 755b411b363SPhilipp Reisner 756b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS) 757b411b363SPhilipp Reisner return -2; 758b411b363SPhilipp Reisner 759b411b363SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &mdev->flags); 760b411b363SPhilipp Reisner 761b411b363SPhilipp Reisner sock = NULL; 762b411b363SPhilipp Reisner msock = NULL; 763b411b363SPhilipp Reisner 764b411b363SPhilipp Reisner do { 765b411b363SPhilipp Reisner for (try = 0;;) { 766b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 767b411b363SPhilipp Reisner s = drbd_try_connect(mdev); 768b411b363SPhilipp Reisner if (s || ++try >= 3) 769b411b363SPhilipp Reisner break; 770b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 77120ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 772b411b363SPhilipp Reisner } 773b411b363SPhilipp Reisner 774b411b363SPhilipp Reisner if (s) { 775b411b363SPhilipp Reisner if (!sock) { 776b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_S); 777b411b363SPhilipp Reisner sock = s; 778b411b363SPhilipp Reisner s = NULL; 779b411b363SPhilipp Reisner } else if (!msock) { 780b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_M); 781b411b363SPhilipp Reisner msock = s; 782b411b363SPhilipp Reisner s = NULL; 783b411b363SPhilipp Reisner } else { 784b411b363SPhilipp Reisner dev_err(DEV, "Logic error in drbd_connect()\n"); 785b411b363SPhilipp Reisner goto out_release_sockets; 786b411b363SPhilipp Reisner } 787b411b363SPhilipp Reisner } 788b411b363SPhilipp Reisner 789b411b363SPhilipp Reisner if (sock && msock) { 79020ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 791b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 792b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 793b411b363SPhilipp Reisner if (ok) 794b411b363SPhilipp Reisner break; 795b411b363SPhilipp Reisner } 796b411b363SPhilipp Reisner 797b411b363SPhilipp Reisner retry: 798b411b363SPhilipp Reisner s = drbd_wait_for_connect(mdev); 799b411b363SPhilipp Reisner if (s) { 800b411b363SPhilipp Reisner try = drbd_recv_fp(mdev, s); 801b411b363SPhilipp Reisner drbd_socket_okay(mdev, &sock); 802b411b363SPhilipp Reisner drbd_socket_okay(mdev, &msock); 803b411b363SPhilipp Reisner switch (try) { 804b411b363SPhilipp Reisner case P_HAND_SHAKE_S: 805b411b363SPhilipp Reisner if (sock) { 806b411b363SPhilipp Reisner dev_warn(DEV, "initial packet S crossed\n"); 807b411b363SPhilipp Reisner sock_release(sock); 808b411b363SPhilipp Reisner } 809b411b363SPhilipp Reisner sock = s; 810b411b363SPhilipp Reisner break; 811b411b363SPhilipp Reisner case P_HAND_SHAKE_M: 812b411b363SPhilipp Reisner if (msock) { 813b411b363SPhilipp Reisner dev_warn(DEV, "initial packet M crossed\n"); 814b411b363SPhilipp Reisner sock_release(msock); 815b411b363SPhilipp Reisner } 816b411b363SPhilipp Reisner msock = s; 817b411b363SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &mdev->flags); 818b411b363SPhilipp Reisner break; 819b411b363SPhilipp Reisner default: 820b411b363SPhilipp Reisner dev_warn(DEV, "Error receiving initial packet\n"); 821b411b363SPhilipp Reisner sock_release(s); 822b411b363SPhilipp Reisner if (random32() & 1) 823b411b363SPhilipp Reisner goto retry; 824b411b363SPhilipp Reisner } 825b411b363SPhilipp Reisner } 826b411b363SPhilipp Reisner 827b411b363SPhilipp Reisner if (mdev->state.conn <= C_DISCONNECTING) 828b411b363SPhilipp Reisner goto out_release_sockets; 829b411b363SPhilipp Reisner if (signal_pending(current)) { 830b411b363SPhilipp Reisner flush_signals(current); 831b411b363SPhilipp Reisner smp_rmb(); 832b411b363SPhilipp Reisner if (get_t_state(&mdev->receiver) == Exiting) 833b411b363SPhilipp Reisner goto out_release_sockets; 834b411b363SPhilipp Reisner } 835b411b363SPhilipp Reisner 836b411b363SPhilipp Reisner if (sock && msock) { 837b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 838b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 839b411b363SPhilipp Reisner if (ok) 840b411b363SPhilipp Reisner break; 841b411b363SPhilipp Reisner } 842b411b363SPhilipp Reisner } while (1); 843b411b363SPhilipp Reisner 844b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 845b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 846b411b363SPhilipp Reisner 847b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 848b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 849b411b363SPhilipp Reisner 850b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 851b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 852b411b363SPhilipp Reisner 853b411b363SPhilipp Reisner /* NOT YET ... 854b411b363SPhilipp Reisner * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 855b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 856b411b363SPhilipp Reisner * first set it to the P_HAND_SHAKE timeout, 857b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 858b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = 859b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10; 860b411b363SPhilipp Reisner 861b411b363SPhilipp Reisner msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 862b411b363SPhilipp Reisner msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 863b411b363SPhilipp Reisner 864b411b363SPhilipp Reisner /* we don't want delays. 865b411b363SPhilipp Reisner * we use TCP_CORK where apropriate, though */ 866b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 867b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 868b411b363SPhilipp Reisner 869b411b363SPhilipp Reisner mdev->data.socket = sock; 870b411b363SPhilipp Reisner mdev->meta.socket = msock; 871b411b363SPhilipp Reisner mdev->last_received = jiffies; 872b411b363SPhilipp Reisner 873b411b363SPhilipp Reisner D_ASSERT(mdev->asender.task == NULL); 874b411b363SPhilipp Reisner 875b411b363SPhilipp Reisner h = drbd_do_handshake(mdev); 876b411b363SPhilipp Reisner if (h <= 0) 877b411b363SPhilipp Reisner return h; 878b411b363SPhilipp Reisner 879b411b363SPhilipp Reisner if (mdev->cram_hmac_tfm) { 880b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 881b10d96cbSJohannes Thoma switch (drbd_do_auth(mdev)) { 882b10d96cbSJohannes Thoma case -1: 883b411b363SPhilipp Reisner dev_err(DEV, "Authentication of peer failed\n"); 884b411b363SPhilipp Reisner return -1; 885b10d96cbSJohannes Thoma case 0: 886b10d96cbSJohannes Thoma dev_err(DEV, "Authentication of peer failed, trying again.\n"); 887b10d96cbSJohannes Thoma return 0; 888b411b363SPhilipp Reisner } 889b411b363SPhilipp Reisner } 890b411b363SPhilipp Reisner 891b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS) 892b411b363SPhilipp Reisner return 0; 893b411b363SPhilipp Reisner 894b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 895b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 896b411b363SPhilipp Reisner 897b411b363SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 898b411b363SPhilipp Reisner mdev->peer_seq = 0; 899b411b363SPhilipp Reisner 900b411b363SPhilipp Reisner drbd_thread_start(&mdev->asender); 901b411b363SPhilipp Reisner 902d5373389SPhilipp Reisner if (mdev->agreed_pro_version < 95 && get_ldev(mdev)) { 903d5373389SPhilipp Reisner drbd_setup_queue_param(mdev, DRBD_MAX_SIZE_H80_PACKET); 904d5373389SPhilipp Reisner put_ldev(mdev); 905d5373389SPhilipp Reisner } 906d5373389SPhilipp Reisner 907148efa16SPhilipp Reisner if (drbd_send_protocol(mdev) == -1) 9087e2455c1SPhilipp Reisner return -1; 909b411b363SPhilipp Reisner drbd_send_sync_param(mdev, &mdev->sync_conf); 910e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, 0); 911b411b363SPhilipp Reisner drbd_send_uuids(mdev); 912b411b363SPhilipp Reisner drbd_send_state(mdev); 913b411b363SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 914b411b363SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 915b411b363SPhilipp Reisner 916b411b363SPhilipp Reisner return 1; 917b411b363SPhilipp Reisner 918b411b363SPhilipp Reisner out_release_sockets: 919b411b363SPhilipp Reisner if (sock) 920b411b363SPhilipp Reisner sock_release(sock); 921b411b363SPhilipp Reisner if (msock) 922b411b363SPhilipp Reisner sock_release(msock); 923b411b363SPhilipp Reisner return -1; 924b411b363SPhilipp Reisner } 925b411b363SPhilipp Reisner 92602918be2SPhilipp Reisner static int drbd_recv_header(struct drbd_conf *mdev, enum drbd_packets *cmd, unsigned int *packet_size) 927b411b363SPhilipp Reisner { 92802918be2SPhilipp Reisner union p_header *h = &mdev->data.rbuf.header; 929b411b363SPhilipp Reisner int r; 930b411b363SPhilipp Reisner 931b411b363SPhilipp Reisner r = drbd_recv(mdev, h, sizeof(*h)); 932b411b363SPhilipp Reisner if (unlikely(r != sizeof(*h))) { 933b411b363SPhilipp Reisner dev_err(DEV, "short read expecting header on sock: r=%d\n", r); 93481e84650SAndreas Gruenbacher return false; 93502918be2SPhilipp Reisner } 93602918be2SPhilipp Reisner 93702918be2SPhilipp Reisner if (likely(h->h80.magic == BE_DRBD_MAGIC)) { 93802918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h80.command); 93902918be2SPhilipp Reisner *packet_size = be16_to_cpu(h->h80.length); 94002918be2SPhilipp Reisner } else if (h->h95.magic == BE_DRBD_MAGIC_BIG) { 94102918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h95.command); 94202918be2SPhilipp Reisner *packet_size = be32_to_cpu(h->h95.length); 94302918be2SPhilipp Reisner } else { 944004352faSLars Ellenberg dev_err(DEV, "magic?? on data m: 0x%08x c: %d l: %d\n", 945004352faSLars Ellenberg be32_to_cpu(h->h80.magic), 946004352faSLars Ellenberg be16_to_cpu(h->h80.command), 947004352faSLars Ellenberg be16_to_cpu(h->h80.length)); 94881e84650SAndreas Gruenbacher return false; 949b411b363SPhilipp Reisner } 950b411b363SPhilipp Reisner mdev->last_received = jiffies; 951b411b363SPhilipp Reisner 95281e84650SAndreas Gruenbacher return true; 953b411b363SPhilipp Reisner } 954b411b363SPhilipp Reisner 9552451fc3bSPhilipp Reisner static void drbd_flush(struct drbd_conf *mdev) 956b411b363SPhilipp Reisner { 957b411b363SPhilipp Reisner int rv; 958b411b363SPhilipp Reisner 959b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 960fbd9b09aSDmitry Monakhov rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, 961dd3932edSChristoph Hellwig NULL); 962b411b363SPhilipp Reisner if (rv) { 963b411b363SPhilipp Reisner dev_err(DEV, "local disk flush failed with status %d\n", rv); 964b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 965b411b363SPhilipp Reisner * don't try again for ANY return value != 0 966b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 967b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 968b411b363SPhilipp Reisner } 969b411b363SPhilipp Reisner put_ldev(mdev); 970b411b363SPhilipp Reisner } 971b411b363SPhilipp Reisner } 972b411b363SPhilipp Reisner 973b411b363SPhilipp Reisner /** 974b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 975b411b363SPhilipp Reisner * @mdev: DRBD device. 976b411b363SPhilipp Reisner * @epoch: Epoch object. 977b411b363SPhilipp Reisner * @ev: Epoch event. 978b411b363SPhilipp Reisner */ 979b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 980b411b363SPhilipp Reisner struct drbd_epoch *epoch, 981b411b363SPhilipp Reisner enum epoch_event ev) 982b411b363SPhilipp Reisner { 9832451fc3bSPhilipp Reisner int epoch_size; 984b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 985b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 986b411b363SPhilipp Reisner 987b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 988b411b363SPhilipp Reisner do { 989b411b363SPhilipp Reisner next_epoch = NULL; 990b411b363SPhilipp Reisner 991b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 992b411b363SPhilipp Reisner 993b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 994b411b363SPhilipp Reisner case EV_PUT: 995b411b363SPhilipp Reisner atomic_dec(&epoch->active); 996b411b363SPhilipp Reisner break; 997b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 998b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 999b411b363SPhilipp Reisner break; 1000b411b363SPhilipp Reisner case EV_BECAME_LAST: 1001b411b363SPhilipp Reisner /* nothing to do*/ 1002b411b363SPhilipp Reisner break; 1003b411b363SPhilipp Reisner } 1004b411b363SPhilipp Reisner 1005b411b363SPhilipp Reisner if (epoch_size != 0 && 1006b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 10072451fc3bSPhilipp Reisner test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) { 1008b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1009b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1010b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1011b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1012b411b363SPhilipp Reisner } 1013b411b363SPhilipp Reisner dec_unacked(mdev); 1014b411b363SPhilipp Reisner 1015b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1016b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1017b411b363SPhilipp Reisner list_del(&epoch->list); 1018b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1019b411b363SPhilipp Reisner mdev->epochs--; 1020b411b363SPhilipp Reisner kfree(epoch); 1021b411b363SPhilipp Reisner 1022b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1023b411b363SPhilipp Reisner rv = FE_DESTROYED; 1024b411b363SPhilipp Reisner } else { 1025b411b363SPhilipp Reisner epoch->flags = 0; 1026b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1027698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1028b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1029b411b363SPhilipp Reisner rv = FE_RECYCLED; 10302451fc3bSPhilipp Reisner wake_up(&mdev->ee_wait); 1031b411b363SPhilipp Reisner } 1032b411b363SPhilipp Reisner } 1033b411b363SPhilipp Reisner 1034b411b363SPhilipp Reisner if (!next_epoch) 1035b411b363SPhilipp Reisner break; 1036b411b363SPhilipp Reisner 1037b411b363SPhilipp Reisner epoch = next_epoch; 1038b411b363SPhilipp Reisner } while (1); 1039b411b363SPhilipp Reisner 1040b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1041b411b363SPhilipp Reisner 1042b411b363SPhilipp Reisner return rv; 1043b411b363SPhilipp Reisner } 1044b411b363SPhilipp Reisner 1045b411b363SPhilipp Reisner /** 1046b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1047b411b363SPhilipp Reisner * @mdev: DRBD device. 1048b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1049b411b363SPhilipp Reisner */ 1050b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1051b411b363SPhilipp Reisner { 1052b411b363SPhilipp Reisner enum write_ordering_e pwo; 1053b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1054b411b363SPhilipp Reisner [WO_none] = "none", 1055b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1056b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1057b411b363SPhilipp Reisner }; 1058b411b363SPhilipp Reisner 1059b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1060b411b363SPhilipp Reisner wo = min(pwo, wo); 1061b411b363SPhilipp Reisner if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) 1062b411b363SPhilipp Reisner wo = WO_drain_io; 1063b411b363SPhilipp Reisner if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) 1064b411b363SPhilipp Reisner wo = WO_none; 1065b411b363SPhilipp Reisner mdev->write_ordering = wo; 10662451fc3bSPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bdev_flush) 1067b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1068b411b363SPhilipp Reisner } 1069b411b363SPhilipp Reisner 1070b411b363SPhilipp Reisner /** 107145bb912bSLars Ellenberg * drbd_submit_ee() 107245bb912bSLars Ellenberg * @mdev: DRBD device. 107345bb912bSLars Ellenberg * @e: epoch entry 107445bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 107545bb912bSLars Ellenberg */ 107645bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 107745bb912bSLars Ellenberg int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, 107845bb912bSLars Ellenberg const unsigned rw, const int fault_type) 107945bb912bSLars Ellenberg { 108045bb912bSLars Ellenberg struct bio *bios = NULL; 108145bb912bSLars Ellenberg struct bio *bio; 108245bb912bSLars Ellenberg struct page *page = e->pages; 108345bb912bSLars Ellenberg sector_t sector = e->sector; 108445bb912bSLars Ellenberg unsigned ds = e->size; 108545bb912bSLars Ellenberg unsigned n_bios = 0; 108645bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 108745bb912bSLars Ellenberg 108845bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 108945bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 109045bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 109145bb912bSLars Ellenberg * request in more than one bio. */ 109245bb912bSLars Ellenberg next_bio: 109345bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 109445bb912bSLars Ellenberg if (!bio) { 109545bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 109645bb912bSLars Ellenberg goto fail; 109745bb912bSLars Ellenberg } 109845bb912bSLars Ellenberg /* > e->sector, unless this is the first bio */ 109945bb912bSLars Ellenberg bio->bi_sector = sector; 110045bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 110145bb912bSLars Ellenberg bio->bi_rw = rw; 110245bb912bSLars Ellenberg bio->bi_private = e; 110345bb912bSLars Ellenberg bio->bi_end_io = drbd_endio_sec; 110445bb912bSLars Ellenberg 110545bb912bSLars Ellenberg bio->bi_next = bios; 110645bb912bSLars Ellenberg bios = bio; 110745bb912bSLars Ellenberg ++n_bios; 110845bb912bSLars Ellenberg 110945bb912bSLars Ellenberg page_chain_for_each(page) { 111045bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 111145bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 111245bb912bSLars Ellenberg /* a single page must always be possible! */ 111345bb912bSLars Ellenberg BUG_ON(bio->bi_vcnt == 0); 111445bb912bSLars Ellenberg goto next_bio; 111545bb912bSLars Ellenberg } 111645bb912bSLars Ellenberg ds -= len; 111745bb912bSLars Ellenberg sector += len >> 9; 111845bb912bSLars Ellenberg --nr_pages; 111945bb912bSLars Ellenberg } 112045bb912bSLars Ellenberg D_ASSERT(page == NULL); 112145bb912bSLars Ellenberg D_ASSERT(ds == 0); 112245bb912bSLars Ellenberg 112345bb912bSLars Ellenberg atomic_set(&e->pending_bios, n_bios); 112445bb912bSLars Ellenberg do { 112545bb912bSLars Ellenberg bio = bios; 112645bb912bSLars Ellenberg bios = bios->bi_next; 112745bb912bSLars Ellenberg bio->bi_next = NULL; 112845bb912bSLars Ellenberg 112945bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 113045bb912bSLars Ellenberg } while (bios); 113145bb912bSLars Ellenberg return 0; 113245bb912bSLars Ellenberg 113345bb912bSLars Ellenberg fail: 113445bb912bSLars Ellenberg while (bios) { 113545bb912bSLars Ellenberg bio = bios; 113645bb912bSLars Ellenberg bios = bios->bi_next; 113745bb912bSLars Ellenberg bio_put(bio); 113845bb912bSLars Ellenberg } 113945bb912bSLars Ellenberg return -ENOMEM; 114045bb912bSLars Ellenberg } 114145bb912bSLars Ellenberg 114202918be2SPhilipp Reisner static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1143b411b363SPhilipp Reisner { 11442451fc3bSPhilipp Reisner int rv; 114502918be2SPhilipp Reisner struct p_barrier *p = &mdev->data.rbuf.barrier; 1146b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1147b411b363SPhilipp Reisner 1148b411b363SPhilipp Reisner inc_unacked(mdev); 1149b411b363SPhilipp Reisner 1150b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1151b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1152b411b363SPhilipp Reisner 1153b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1154b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1155b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1156b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1157b411b363SPhilipp Reisner * completed. */ 1158b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1159b411b363SPhilipp Reisner case WO_none: 1160b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 116181e84650SAndreas Gruenbacher return true; 1162b411b363SPhilipp Reisner 1163b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1164b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1165b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 11662451fc3bSPhilipp Reisner if (epoch) 11672451fc3bSPhilipp Reisner break; 11682451fc3bSPhilipp Reisner else 1169b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 11702451fc3bSPhilipp Reisner /* Fall through */ 11712451fc3bSPhilipp Reisner 11722451fc3bSPhilipp Reisner case WO_bdev_flush: 11732451fc3bSPhilipp Reisner case WO_drain_io: 1174b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 11752451fc3bSPhilipp Reisner drbd_flush(mdev); 11762451fc3bSPhilipp Reisner 11772451fc3bSPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 11782451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 11792451fc3bSPhilipp Reisner if (epoch) 11802451fc3bSPhilipp Reisner break; 1181b411b363SPhilipp Reisner } 1182b411b363SPhilipp Reisner 11832451fc3bSPhilipp Reisner epoch = mdev->current_epoch; 11842451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 11852451fc3bSPhilipp Reisner 11862451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 11872451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1188b411b363SPhilipp Reisner 118981e84650SAndreas Gruenbacher return true; 11902451fc3bSPhilipp Reisner default: 11912451fc3bSPhilipp Reisner dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); 119281e84650SAndreas Gruenbacher return false; 1193b411b363SPhilipp Reisner } 1194b411b363SPhilipp Reisner 1195b411b363SPhilipp Reisner epoch->flags = 0; 1196b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1197b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1198b411b363SPhilipp Reisner 1199b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1200b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1201b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1202b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1203b411b363SPhilipp Reisner mdev->epochs++; 1204b411b363SPhilipp Reisner } else { 1205b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1206b411b363SPhilipp Reisner kfree(epoch); 1207b411b363SPhilipp Reisner } 1208b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1209b411b363SPhilipp Reisner 121081e84650SAndreas Gruenbacher return true; 1211b411b363SPhilipp Reisner } 1212b411b363SPhilipp Reisner 1213b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1214b411b363SPhilipp Reisner * and from receive_Data */ 1215b411b363SPhilipp Reisner static struct drbd_epoch_entry * 1216b411b363SPhilipp Reisner read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local) 1217b411b363SPhilipp Reisner { 12186666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1219b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1220b411b363SPhilipp Reisner struct page *page; 122145bb912bSLars Ellenberg int dgs, ds, rr; 1222b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1223b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 12246b4388acSPhilipp Reisner unsigned long *data; 1225b411b363SPhilipp Reisner 1226b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1227b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1228b411b363SPhilipp Reisner 1229b411b363SPhilipp Reisner if (dgs) { 1230b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1231b411b363SPhilipp Reisner if (rr != dgs) { 1232b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data digest: read %d expected %d\n", 1233b411b363SPhilipp Reisner rr, dgs); 1234b411b363SPhilipp Reisner return NULL; 1235b411b363SPhilipp Reisner } 1236b411b363SPhilipp Reisner } 1237b411b363SPhilipp Reisner 1238b411b363SPhilipp Reisner data_size -= dgs; 1239b411b363SPhilipp Reisner 1240d07c9c10SPhilipp Reisner ERR_IF(data_size == 0) return NULL; 1241b411b363SPhilipp Reisner ERR_IF(data_size & 0x1ff) return NULL; 12421816a2b4SLars Ellenberg ERR_IF(data_size > DRBD_MAX_BIO_SIZE) return NULL; 1243b411b363SPhilipp Reisner 12446666032aSLars Ellenberg /* even though we trust out peer, 12456666032aSLars Ellenberg * we sometimes have to double check. */ 12466666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 12476666032aSLars Ellenberg dev_err(DEV, "capacity: %llus < sector: %llus + size: %u\n", 12486666032aSLars Ellenberg (unsigned long long)capacity, 12496666032aSLars Ellenberg (unsigned long long)sector, data_size); 12506666032aSLars Ellenberg return NULL; 12516666032aSLars Ellenberg } 12526666032aSLars Ellenberg 1253b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1254b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1255b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1256b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); 1257b411b363SPhilipp Reisner if (!e) 1258b411b363SPhilipp Reisner return NULL; 125945bb912bSLars Ellenberg 1260b411b363SPhilipp Reisner ds = data_size; 126145bb912bSLars Ellenberg page = e->pages; 126245bb912bSLars Ellenberg page_chain_for_each(page) { 126345bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 12646b4388acSPhilipp Reisner data = kmap(page); 126545bb912bSLars Ellenberg rr = drbd_recv(mdev, data, len); 12660cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 12676b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 12686b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 12696b4388acSPhilipp Reisner } 1270b411b363SPhilipp Reisner kunmap(page); 127145bb912bSLars Ellenberg if (rr != len) { 1272b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1273b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 127445bb912bSLars Ellenberg rr, len); 1275b411b363SPhilipp Reisner return NULL; 1276b411b363SPhilipp Reisner } 1277b411b363SPhilipp Reisner ds -= rr; 1278b411b363SPhilipp Reisner } 1279b411b363SPhilipp Reisner 1280b411b363SPhilipp Reisner if (dgs) { 128145bb912bSLars Ellenberg drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv); 1282b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1283470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1284470be44aSLars Ellenberg (unsigned long long)sector, data_size); 1285b411b363SPhilipp Reisner drbd_bcast_ee(mdev, "digest failed", 1286b411b363SPhilipp Reisner dgs, dig_in, dig_vv, e); 1287b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1288b411b363SPhilipp Reisner return NULL; 1289b411b363SPhilipp Reisner } 1290b411b363SPhilipp Reisner } 1291b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1292b411b363SPhilipp Reisner return e; 1293b411b363SPhilipp Reisner } 1294b411b363SPhilipp Reisner 1295b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1296b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1297b411b363SPhilipp Reisner */ 1298b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1299b411b363SPhilipp Reisner { 1300b411b363SPhilipp Reisner struct page *page; 1301b411b363SPhilipp Reisner int rr, rv = 1; 1302b411b363SPhilipp Reisner void *data; 1303b411b363SPhilipp Reisner 1304c3470cdeSLars Ellenberg if (!data_size) 130581e84650SAndreas Gruenbacher return true; 1306c3470cdeSLars Ellenberg 130745bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, 1, 1); 1308b411b363SPhilipp Reisner 1309b411b363SPhilipp Reisner data = kmap(page); 1310b411b363SPhilipp Reisner while (data_size) { 1311b411b363SPhilipp Reisner rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); 1312b411b363SPhilipp Reisner if (rr != min_t(int, data_size, PAGE_SIZE)) { 1313b411b363SPhilipp Reisner rv = 0; 1314b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 1315b411b363SPhilipp Reisner rr, min_t(int, data_size, PAGE_SIZE)); 1316b411b363SPhilipp Reisner break; 1317b411b363SPhilipp Reisner } 1318b411b363SPhilipp Reisner data_size -= rr; 1319b411b363SPhilipp Reisner } 1320b411b363SPhilipp Reisner kunmap(page); 1321435f0740SLars Ellenberg drbd_pp_free(mdev, page, 0); 1322b411b363SPhilipp Reisner return rv; 1323b411b363SPhilipp Reisner } 1324b411b363SPhilipp Reisner 1325b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1326b411b363SPhilipp Reisner sector_t sector, int data_size) 1327b411b363SPhilipp Reisner { 1328b411b363SPhilipp Reisner struct bio_vec *bvec; 1329b411b363SPhilipp Reisner struct bio *bio; 1330b411b363SPhilipp Reisner int dgs, rr, i, expect; 1331b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1332b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 1333b411b363SPhilipp Reisner 1334b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1335b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1336b411b363SPhilipp Reisner 1337b411b363SPhilipp Reisner if (dgs) { 1338b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1339b411b363SPhilipp Reisner if (rr != dgs) { 1340b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n", 1341b411b363SPhilipp Reisner rr, dgs); 1342b411b363SPhilipp Reisner return 0; 1343b411b363SPhilipp Reisner } 1344b411b363SPhilipp Reisner } 1345b411b363SPhilipp Reisner 1346b411b363SPhilipp Reisner data_size -= dgs; 1347b411b363SPhilipp Reisner 1348b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1349b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1350b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1351b411b363SPhilipp Reisner 1352b411b363SPhilipp Reisner bio = req->master_bio; 1353b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1354b411b363SPhilipp Reisner 1355b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1356b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1357b411b363SPhilipp Reisner rr = drbd_recv(mdev, 1358b411b363SPhilipp Reisner kmap(bvec->bv_page)+bvec->bv_offset, 1359b411b363SPhilipp Reisner expect); 1360b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1361b411b363SPhilipp Reisner if (rr != expect) { 1362b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply: " 1363b411b363SPhilipp Reisner "read %d expected %d\n", 1364b411b363SPhilipp Reisner rr, expect); 1365b411b363SPhilipp Reisner return 0; 1366b411b363SPhilipp Reisner } 1367b411b363SPhilipp Reisner data_size -= rr; 1368b411b363SPhilipp Reisner } 1369b411b363SPhilipp Reisner 1370b411b363SPhilipp Reisner if (dgs) { 137145bb912bSLars Ellenberg drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv); 1372b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1373b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 1374b411b363SPhilipp Reisner return 0; 1375b411b363SPhilipp Reisner } 1376b411b363SPhilipp Reisner } 1377b411b363SPhilipp Reisner 1378b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 1379b411b363SPhilipp Reisner return 1; 1380b411b363SPhilipp Reisner } 1381b411b363SPhilipp Reisner 1382b411b363SPhilipp Reisner /* e_end_resync_block() is called via 1383b411b363SPhilipp Reisner * drbd_process_done_ee() by asender only */ 1384b411b363SPhilipp Reisner static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1385b411b363SPhilipp Reisner { 1386b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1387b411b363SPhilipp Reisner sector_t sector = e->sector; 1388b411b363SPhilipp Reisner int ok; 1389b411b363SPhilipp Reisner 1390b411b363SPhilipp Reisner D_ASSERT(hlist_unhashed(&e->colision)); 1391b411b363SPhilipp Reisner 139245bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1393b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1394b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e); 1395b411b363SPhilipp Reisner } else { 1396b411b363SPhilipp Reisner /* Record failure to sync */ 1397b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, e->size); 1398b411b363SPhilipp Reisner 1399b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1400b411b363SPhilipp Reisner } 1401b411b363SPhilipp Reisner dec_unacked(mdev); 1402b411b363SPhilipp Reisner 1403b411b363SPhilipp Reisner return ok; 1404b411b363SPhilipp Reisner } 1405b411b363SPhilipp Reisner 1406b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1407b411b363SPhilipp Reisner { 1408b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1409b411b363SPhilipp Reisner 1410b411b363SPhilipp Reisner e = read_in_block(mdev, ID_SYNCER, sector, data_size); 141145bb912bSLars Ellenberg if (!e) 141245bb912bSLars Ellenberg goto fail; 1413b411b363SPhilipp Reisner 1414b411b363SPhilipp Reisner dec_rs_pending(mdev); 1415b411b363SPhilipp Reisner 1416b411b363SPhilipp Reisner inc_unacked(mdev); 1417b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1418b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1419b411b363SPhilipp Reisner 142045bb912bSLars Ellenberg e->w.cb = e_end_resync_block; 142145bb912bSLars Ellenberg 1422b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1423b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->sync_ee); 1424b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1425b411b363SPhilipp Reisner 14260f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 142745bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0) 142881e84650SAndreas Gruenbacher return true; 142945bb912bSLars Ellenberg 143022cc37a9SLars Ellenberg /* drbd_submit_ee currently fails for one reason only: 143122cc37a9SLars Ellenberg * not being able to allocate enough bios. 143222cc37a9SLars Ellenberg * Is dropping the connection going to help? */ 143322cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 143422cc37a9SLars Ellenberg list_del(&e->w.list); 143522cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 143622cc37a9SLars Ellenberg 143745bb912bSLars Ellenberg drbd_free_ee(mdev, e); 143845bb912bSLars Ellenberg fail: 143945bb912bSLars Ellenberg put_ldev(mdev); 144081e84650SAndreas Gruenbacher return false; 1441b411b363SPhilipp Reisner } 1442b411b363SPhilipp Reisner 144302918be2SPhilipp Reisner static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1444b411b363SPhilipp Reisner { 1445b411b363SPhilipp Reisner struct drbd_request *req; 1446b411b363SPhilipp Reisner sector_t sector; 1447b411b363SPhilipp Reisner int ok; 144802918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1449b411b363SPhilipp Reisner 1450b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1451b411b363SPhilipp Reisner 1452b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1453b411b363SPhilipp Reisner req = _ar_id_to_req(mdev, p->block_id, sector); 1454b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1455b411b363SPhilipp Reisner if (unlikely(!req)) { 1456b411b363SPhilipp Reisner dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n"); 145781e84650SAndreas Gruenbacher return false; 1458b411b363SPhilipp Reisner } 1459b411b363SPhilipp Reisner 1460b411b363SPhilipp Reisner /* hlist_del(&req->colision) is done in _req_may_be_done, to avoid 1461b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1462b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1463b411b363SPhilipp Reisner ok = recv_dless_read(mdev, req, sector, data_size); 1464b411b363SPhilipp Reisner 1465b411b363SPhilipp Reisner if (ok) 1466b411b363SPhilipp Reisner req_mod(req, data_received); 1467b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1468b411b363SPhilipp Reisner * I don't think we may complete this just yet 1469b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1470b411b363SPhilipp Reisner 1471b411b363SPhilipp Reisner return ok; 1472b411b363SPhilipp Reisner } 1473b411b363SPhilipp Reisner 147402918be2SPhilipp Reisner static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1475b411b363SPhilipp Reisner { 1476b411b363SPhilipp Reisner sector_t sector; 1477b411b363SPhilipp Reisner int ok; 147802918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1479b411b363SPhilipp Reisner 1480b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1481b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1482b411b363SPhilipp Reisner 1483b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1484b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1485b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1486b411b363SPhilipp Reisner * or in drbd_endio_write_sec. */ 1487b411b363SPhilipp Reisner ok = recv_resync_read(mdev, sector, data_size); 1488b411b363SPhilipp Reisner } else { 1489b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1490b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1491b411b363SPhilipp Reisner 1492b411b363SPhilipp Reisner ok = drbd_drain_block(mdev, data_size); 1493b411b363SPhilipp Reisner 14942b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1495b411b363SPhilipp Reisner } 1496b411b363SPhilipp Reisner 1497778f271dSPhilipp Reisner atomic_add(data_size >> 9, &mdev->rs_sect_in); 1498778f271dSPhilipp Reisner 1499b411b363SPhilipp Reisner return ok; 1500b411b363SPhilipp Reisner } 1501b411b363SPhilipp Reisner 1502b411b363SPhilipp Reisner /* e_end_block() is called via drbd_process_done_ee(). 1503b411b363SPhilipp Reisner * this means this function only runs in the asender thread 1504b411b363SPhilipp Reisner */ 1505b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1506b411b363SPhilipp Reisner { 1507b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1508b411b363SPhilipp Reisner sector_t sector = e->sector; 1509b411b363SPhilipp Reisner int ok = 1, pcmd; 1510b411b363SPhilipp Reisner 1511b411b363SPhilipp Reisner if (mdev->net_conf->wire_protocol == DRBD_PROT_C) { 151245bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1513b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1514b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1515b411b363SPhilipp Reisner e->flags & EE_MAY_SET_IN_SYNC) ? 1516b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 1517b411b363SPhilipp Reisner ok &= drbd_send_ack(mdev, pcmd, e); 1518b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1519b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1520b411b363SPhilipp Reisner } else { 1521b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1522b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1523b411b363SPhilipp Reisner * maybe assert this? */ 1524b411b363SPhilipp Reisner } 1525b411b363SPhilipp Reisner dec_unacked(mdev); 1526b411b363SPhilipp Reisner } 1527b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1528b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 1529b411b363SPhilipp Reisner if (mdev->net_conf->two_primaries) { 1530b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1531b411b363SPhilipp Reisner D_ASSERT(!hlist_unhashed(&e->colision)); 1532b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1533b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1534b411b363SPhilipp Reisner } else { 1535b411b363SPhilipp Reisner D_ASSERT(hlist_unhashed(&e->colision)); 1536b411b363SPhilipp Reisner } 1537b411b363SPhilipp Reisner 1538b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1539b411b363SPhilipp Reisner 1540b411b363SPhilipp Reisner return ok; 1541b411b363SPhilipp Reisner } 1542b411b363SPhilipp Reisner 1543b411b363SPhilipp Reisner static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1544b411b363SPhilipp Reisner { 1545b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1546b411b363SPhilipp Reisner int ok = 1; 1547b411b363SPhilipp Reisner 1548b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1549b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_DISCARD_ACK, e); 1550b411b363SPhilipp Reisner 1551b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1552b411b363SPhilipp Reisner D_ASSERT(!hlist_unhashed(&e->colision)); 1553b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1554b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1555b411b363SPhilipp Reisner 1556b411b363SPhilipp Reisner dec_unacked(mdev); 1557b411b363SPhilipp Reisner 1558b411b363SPhilipp Reisner return ok; 1559b411b363SPhilipp Reisner } 1560b411b363SPhilipp Reisner 1561b411b363SPhilipp Reisner /* Called from receive_Data. 1562b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1563b411b363SPhilipp Reisner * 1564b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1565b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1566b411b363SPhilipp Reisner * been sent. 1567b411b363SPhilipp Reisner * 1568b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1569b411b363SPhilipp Reisner * 1570b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1571b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1572b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1573b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1574b411b363SPhilipp Reisner * 1575b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1576b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1577b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1578b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1579b411b363SPhilipp Reisner * 1580b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1581b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 1582b411b363SPhilipp Reisner static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) 1583b411b363SPhilipp Reisner { 1584b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1585b411b363SPhilipp Reisner unsigned int p_seq; 1586b411b363SPhilipp Reisner long timeout; 1587b411b363SPhilipp Reisner int ret = 0; 1588b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1589b411b363SPhilipp Reisner for (;;) { 1590b411b363SPhilipp Reisner prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1591b411b363SPhilipp Reisner if (seq_le(packet_seq, mdev->peer_seq+1)) 1592b411b363SPhilipp Reisner break; 1593b411b363SPhilipp Reisner if (signal_pending(current)) { 1594b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1595b411b363SPhilipp Reisner break; 1596b411b363SPhilipp Reisner } 1597b411b363SPhilipp Reisner p_seq = mdev->peer_seq; 1598b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1599b411b363SPhilipp Reisner timeout = schedule_timeout(30*HZ); 1600b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1601b411b363SPhilipp Reisner if (timeout == 0 && p_seq == mdev->peer_seq) { 1602b411b363SPhilipp Reisner ret = -ETIMEDOUT; 1603b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); 1604b411b363SPhilipp Reisner break; 1605b411b363SPhilipp Reisner } 1606b411b363SPhilipp Reisner } 1607b411b363SPhilipp Reisner finish_wait(&mdev->seq_wait, &wait); 1608b411b363SPhilipp Reisner if (mdev->peer_seq+1 == packet_seq) 1609b411b363SPhilipp Reisner mdev->peer_seq++; 1610b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1611b411b363SPhilipp Reisner return ret; 1612b411b363SPhilipp Reisner } 1613b411b363SPhilipp Reisner 1614688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1615688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1616688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1617688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 161876d2e7ecSPhilipp Reisner { 161976d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 162076d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1621688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 162276d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 162376d2e7ecSPhilipp Reisner } 162476d2e7ecSPhilipp Reisner 1625b411b363SPhilipp Reisner /* mirrored write */ 162602918be2SPhilipp Reisner static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1627b411b363SPhilipp Reisner { 1628b411b363SPhilipp Reisner sector_t sector; 1629b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 163002918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1631b411b363SPhilipp Reisner int rw = WRITE; 1632b411b363SPhilipp Reisner u32 dp_flags; 1633b411b363SPhilipp Reisner 1634b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 1635b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1636b411b363SPhilipp Reisner if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) 1637b411b363SPhilipp Reisner mdev->peer_seq++; 1638b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1639b411b363SPhilipp Reisner 16402b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1641b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 1642b411b363SPhilipp Reisner return drbd_drain_block(mdev, data_size); 1643b411b363SPhilipp Reisner } 1644b411b363SPhilipp Reisner 1645b411b363SPhilipp Reisner /* get_ldev(mdev) successful. 1646b411b363SPhilipp Reisner * Corresponding put_ldev done either below (on various errors), 1647b411b363SPhilipp Reisner * or in drbd_endio_write_sec, if we successfully submit the data at 1648b411b363SPhilipp Reisner * the end of this function. */ 1649b411b363SPhilipp Reisner 1650b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1651b411b363SPhilipp Reisner e = read_in_block(mdev, p->block_id, sector, data_size); 1652b411b363SPhilipp Reisner if (!e) { 1653b411b363SPhilipp Reisner put_ldev(mdev); 165481e84650SAndreas Gruenbacher return false; 1655b411b363SPhilipp Reisner } 1656b411b363SPhilipp Reisner 1657b411b363SPhilipp Reisner e->w.cb = e_end_block; 1658b411b363SPhilipp Reisner 1659688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 1660688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 1661688593c5SLars Ellenberg 1662688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 1663688593c5SLars Ellenberg e->flags |= EE_MAY_SET_IN_SYNC; 1664688593c5SLars Ellenberg 1665b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1666b411b363SPhilipp Reisner e->epoch = mdev->current_epoch; 1667b411b363SPhilipp Reisner atomic_inc(&e->epoch->epoch_size); 1668b411b363SPhilipp Reisner atomic_inc(&e->epoch->active); 1669b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1670b411b363SPhilipp Reisner 1671b411b363SPhilipp Reisner /* I'm the receiver, I do hold a net_cnt reference. */ 1672b411b363SPhilipp Reisner if (!mdev->net_conf->two_primaries) { 1673b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1674b411b363SPhilipp Reisner } else { 1675b411b363SPhilipp Reisner /* don't get the req_lock yet, 1676b411b363SPhilipp Reisner * we may sleep in drbd_wait_peer_seq */ 1677b411b363SPhilipp Reisner const int size = e->size; 1678b411b363SPhilipp Reisner const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1679b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1680b411b363SPhilipp Reisner struct drbd_request *i; 1681b411b363SPhilipp Reisner struct hlist_node *n; 1682b411b363SPhilipp Reisner struct hlist_head *slot; 1683b411b363SPhilipp Reisner int first; 1684b411b363SPhilipp Reisner 1685b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1686b411b363SPhilipp Reisner BUG_ON(mdev->ee_hash == NULL); 1687b411b363SPhilipp Reisner BUG_ON(mdev->tl_hash == NULL); 1688b411b363SPhilipp Reisner 1689b411b363SPhilipp Reisner /* conflict detection and handling: 1690b411b363SPhilipp Reisner * 1. wait on the sequence number, 1691b411b363SPhilipp Reisner * in case this data packet overtook ACK packets. 1692b411b363SPhilipp Reisner * 2. check our hash tables for conflicting requests. 1693b411b363SPhilipp Reisner * we only need to walk the tl_hash, since an ee can not 1694b411b363SPhilipp Reisner * have a conflict with an other ee: on the submitting 1695b411b363SPhilipp Reisner * node, the corresponding req had already been conflicting, 1696b411b363SPhilipp Reisner * and a conflicting req is never sent. 1697b411b363SPhilipp Reisner * 1698b411b363SPhilipp Reisner * Note: for two_primaries, we are protocol C, 1699b411b363SPhilipp Reisner * so there cannot be any request that is DONE 1700b411b363SPhilipp Reisner * but still on the transfer log. 1701b411b363SPhilipp Reisner * 1702b411b363SPhilipp Reisner * unconditionally add to the ee_hash. 1703b411b363SPhilipp Reisner * 1704b411b363SPhilipp Reisner * if no conflicting request is found: 1705b411b363SPhilipp Reisner * submit. 1706b411b363SPhilipp Reisner * 1707b411b363SPhilipp Reisner * if any conflicting request is found 1708b411b363SPhilipp Reisner * that has not yet been acked, 1709b411b363SPhilipp Reisner * AND I have the "discard concurrent writes" flag: 1710b411b363SPhilipp Reisner * queue (via done_ee) the P_DISCARD_ACK; OUT. 1711b411b363SPhilipp Reisner * 1712b411b363SPhilipp Reisner * if any conflicting request is found: 1713b411b363SPhilipp Reisner * block the receiver, waiting on misc_wait 1714b411b363SPhilipp Reisner * until no more conflicting requests are there, 1715b411b363SPhilipp Reisner * or we get interrupted (disconnect). 1716b411b363SPhilipp Reisner * 1717b411b363SPhilipp Reisner * we do not just write after local io completion of those 1718b411b363SPhilipp Reisner * requests, but only after req is done completely, i.e. 1719b411b363SPhilipp Reisner * we wait for the P_DISCARD_ACK to arrive! 1720b411b363SPhilipp Reisner * 1721b411b363SPhilipp Reisner * then proceed normally, i.e. submit. 1722b411b363SPhilipp Reisner */ 1723b411b363SPhilipp Reisner if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) 1724b411b363SPhilipp Reisner goto out_interrupted; 1725b411b363SPhilipp Reisner 1726b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1727b411b363SPhilipp Reisner 1728b411b363SPhilipp Reisner hlist_add_head(&e->colision, ee_hash_slot(mdev, sector)); 1729b411b363SPhilipp Reisner 1730b411b363SPhilipp Reisner #define OVERLAPS overlaps(i->sector, i->size, sector, size) 1731b411b363SPhilipp Reisner slot = tl_hash_slot(mdev, sector); 1732b411b363SPhilipp Reisner first = 1; 1733b411b363SPhilipp Reisner for (;;) { 1734b411b363SPhilipp Reisner int have_unacked = 0; 1735b411b363SPhilipp Reisner int have_conflict = 0; 1736b411b363SPhilipp Reisner prepare_to_wait(&mdev->misc_wait, &wait, 1737b411b363SPhilipp Reisner TASK_INTERRUPTIBLE); 1738b411b363SPhilipp Reisner hlist_for_each_entry(i, n, slot, colision) { 1739b411b363SPhilipp Reisner if (OVERLAPS) { 1740b411b363SPhilipp Reisner /* only ALERT on first iteration, 1741b411b363SPhilipp Reisner * we may be woken up early... */ 1742b411b363SPhilipp Reisner if (first) 1743b411b363SPhilipp Reisner dev_alert(DEV, "%s[%u] Concurrent local write detected!" 1744b411b363SPhilipp Reisner " new: %llus +%u; pending: %llus +%u\n", 1745b411b363SPhilipp Reisner current->comm, current->pid, 1746b411b363SPhilipp Reisner (unsigned long long)sector, size, 1747b411b363SPhilipp Reisner (unsigned long long)i->sector, i->size); 1748b411b363SPhilipp Reisner if (i->rq_state & RQ_NET_PENDING) 1749b411b363SPhilipp Reisner ++have_unacked; 1750b411b363SPhilipp Reisner ++have_conflict; 1751b411b363SPhilipp Reisner } 1752b411b363SPhilipp Reisner } 1753b411b363SPhilipp Reisner #undef OVERLAPS 1754b411b363SPhilipp Reisner if (!have_conflict) 1755b411b363SPhilipp Reisner break; 1756b411b363SPhilipp Reisner 1757b411b363SPhilipp Reisner /* Discard Ack only for the _first_ iteration */ 1758b411b363SPhilipp Reisner if (first && discard && have_unacked) { 1759b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", 1760b411b363SPhilipp Reisner (unsigned long long)sector); 1761b411b363SPhilipp Reisner inc_unacked(mdev); 1762b411b363SPhilipp Reisner e->w.cb = e_send_discard_ack; 1763b411b363SPhilipp Reisner list_add_tail(&e->w.list, &mdev->done_ee); 1764b411b363SPhilipp Reisner 1765b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1766b411b363SPhilipp Reisner 1767b411b363SPhilipp Reisner /* we could probably send that P_DISCARD_ACK ourselves, 1768b411b363SPhilipp Reisner * but I don't like the receiver using the msock */ 1769b411b363SPhilipp Reisner 1770b411b363SPhilipp Reisner put_ldev(mdev); 1771b411b363SPhilipp Reisner wake_asender(mdev); 1772b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 177381e84650SAndreas Gruenbacher return true; 1774b411b363SPhilipp Reisner } 1775b411b363SPhilipp Reisner 1776b411b363SPhilipp Reisner if (signal_pending(current)) { 1777b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1778b411b363SPhilipp Reisner 1779b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1780b411b363SPhilipp Reisner 1781b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1782b411b363SPhilipp Reisner goto out_interrupted; 1783b411b363SPhilipp Reisner } 1784b411b363SPhilipp Reisner 1785b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1786b411b363SPhilipp Reisner if (first) { 1787b411b363SPhilipp Reisner first = 0; 1788b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " 1789b411b363SPhilipp Reisner "sec=%llus\n", (unsigned long long)sector); 1790b411b363SPhilipp Reisner } else if (discard) { 1791b411b363SPhilipp Reisner /* we had none on the first iteration. 1792b411b363SPhilipp Reisner * there must be none now. */ 1793b411b363SPhilipp Reisner D_ASSERT(have_unacked == 0); 1794b411b363SPhilipp Reisner } 1795b411b363SPhilipp Reisner schedule(); 1796b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1797b411b363SPhilipp Reisner } 1798b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1799b411b363SPhilipp Reisner } 1800b411b363SPhilipp Reisner 1801b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->active_ee); 1802b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1803b411b363SPhilipp Reisner 1804b411b363SPhilipp Reisner switch (mdev->net_conf->wire_protocol) { 1805b411b363SPhilipp Reisner case DRBD_PROT_C: 1806b411b363SPhilipp Reisner inc_unacked(mdev); 1807b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 1808b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1809b411b363SPhilipp Reisner break; 1810b411b363SPhilipp Reisner case DRBD_PROT_B: 1811b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 1812b411b363SPhilipp Reisner * sends on the msock, but anyways */ 1813b411b363SPhilipp Reisner drbd_send_ack(mdev, P_RECV_ACK, e); 1814b411b363SPhilipp Reisner break; 1815b411b363SPhilipp Reisner case DRBD_PROT_A: 1816b411b363SPhilipp Reisner /* nothing to do */ 1817b411b363SPhilipp Reisner break; 1818b411b363SPhilipp Reisner } 1819b411b363SPhilipp Reisner 18206719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 1821b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 1822b411b363SPhilipp Reisner drbd_set_out_of_sync(mdev, e->sector, e->size); 1823b411b363SPhilipp Reisner e->flags |= EE_CALL_AL_COMPLETE_IO; 18246719fb03SLars Ellenberg e->flags &= ~EE_MAY_SET_IN_SYNC; 1825b411b363SPhilipp Reisner drbd_al_begin_io(mdev, e->sector); 1826b411b363SPhilipp Reisner } 1827b411b363SPhilipp Reisner 182845bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0) 182981e84650SAndreas Gruenbacher return true; 1830b411b363SPhilipp Reisner 183122cc37a9SLars Ellenberg /* drbd_submit_ee currently fails for one reason only: 183222cc37a9SLars Ellenberg * not being able to allocate enough bios. 183322cc37a9SLars Ellenberg * Is dropping the connection going to help? */ 183422cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 183522cc37a9SLars Ellenberg list_del(&e->w.list); 183622cc37a9SLars Ellenberg hlist_del_init(&e->colision); 183722cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 183822cc37a9SLars Ellenberg if (e->flags & EE_CALL_AL_COMPLETE_IO) 183922cc37a9SLars Ellenberg drbd_al_complete_io(mdev, e->sector); 184022cc37a9SLars Ellenberg 1841b411b363SPhilipp Reisner out_interrupted: 1842b411b363SPhilipp Reisner /* yes, the epoch_size now is imbalanced. 1843b411b363SPhilipp Reisner * but we drop the connection anyways, so we don't have a chance to 1844b411b363SPhilipp Reisner * receive a barrier... atomic_inc(&mdev->epoch_size); */ 1845b411b363SPhilipp Reisner put_ldev(mdev); 1846b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 184781e84650SAndreas Gruenbacher return false; 1848b411b363SPhilipp Reisner } 1849b411b363SPhilipp Reisner 18500f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 18510f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 18520f0601f4SLars Ellenberg * 18530f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 18540f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 18550f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 18560f0601f4SLars Ellenberg * activity, it obviously is "busy". 18570f0601f4SLars Ellenberg * 18580f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 18590f0601f4SLars Ellenberg * to have a short time average so we can react faster. 18600f0601f4SLars Ellenberg */ 1861e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 18620f0601f4SLars Ellenberg { 18630f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 18640f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 1865e3555d85SPhilipp Reisner struct lc_element *tmp; 18660f0601f4SLars Ellenberg int curr_events; 18670f0601f4SLars Ellenberg int throttle = 0; 18680f0601f4SLars Ellenberg 18690f0601f4SLars Ellenberg /* feature disabled? */ 18700f0601f4SLars Ellenberg if (mdev->sync_conf.c_min_rate == 0) 18710f0601f4SLars Ellenberg return 0; 18720f0601f4SLars Ellenberg 1873e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 1874e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 1875e3555d85SPhilipp Reisner if (tmp) { 1876e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 1877e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 1878e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1879e3555d85SPhilipp Reisner return 0; 1880e3555d85SPhilipp Reisner } 1881e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 1882e3555d85SPhilipp Reisner } 1883e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1884e3555d85SPhilipp Reisner 18850f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 18860f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 18870f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 1888e3555d85SPhilipp Reisner 18890f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 18900f0601f4SLars Ellenberg unsigned long rs_left; 18910f0601f4SLars Ellenberg int i; 18920f0601f4SLars Ellenberg 18930f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 18940f0601f4SLars Ellenberg 18950f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 18960f0601f4SLars Ellenberg * approx. */ 18972649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 18982649f080SLars Ellenberg 18992649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 19002649f080SLars Ellenberg rs_left = mdev->ov_left; 19012649f080SLars Ellenberg else 19020f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 19030f0601f4SLars Ellenberg 19040f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 19050f0601f4SLars Ellenberg if (!dt) 19060f0601f4SLars Ellenberg dt++; 19070f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 19080f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 19090f0601f4SLars Ellenberg 19100f0601f4SLars Ellenberg if (dbdt > mdev->sync_conf.c_min_rate) 19110f0601f4SLars Ellenberg throttle = 1; 19120f0601f4SLars Ellenberg } 19130f0601f4SLars Ellenberg return throttle; 19140f0601f4SLars Ellenberg } 19150f0601f4SLars Ellenberg 19160f0601f4SLars Ellenberg 191702918be2SPhilipp Reisner static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int digest_size) 1918b411b363SPhilipp Reisner { 1919b411b363SPhilipp Reisner sector_t sector; 1920b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1921b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1922b411b363SPhilipp Reisner struct digest_info *di = NULL; 1923b18b37beSPhilipp Reisner int size, verb; 1924b411b363SPhilipp Reisner unsigned int fault_type; 192502918be2SPhilipp Reisner struct p_block_req *p = &mdev->data.rbuf.block_req; 1926b411b363SPhilipp Reisner 1927b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1928b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 1929b411b363SPhilipp Reisner 19301816a2b4SLars Ellenberg if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) { 1931b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 1932b411b363SPhilipp Reisner (unsigned long long)sector, size); 193381e84650SAndreas Gruenbacher return false; 1934b411b363SPhilipp Reisner } 1935b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 1936b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 1937b411b363SPhilipp Reisner (unsigned long long)sector, size); 193881e84650SAndreas Gruenbacher return false; 1939b411b363SPhilipp Reisner } 1940b411b363SPhilipp Reisner 1941b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 1942b18b37beSPhilipp Reisner verb = 1; 1943b18b37beSPhilipp Reisner switch (cmd) { 1944b18b37beSPhilipp Reisner case P_DATA_REQUEST: 1945b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 1946b18b37beSPhilipp Reisner break; 1947b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 1948b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 1949b18b37beSPhilipp Reisner case P_OV_REQUEST: 1950b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 1951b18b37beSPhilipp Reisner break; 1952b18b37beSPhilipp Reisner case P_OV_REPLY: 1953b18b37beSPhilipp Reisner verb = 0; 1954b18b37beSPhilipp Reisner dec_rs_pending(mdev); 1955b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 1956b18b37beSPhilipp Reisner break; 1957b18b37beSPhilipp Reisner default: 1958b18b37beSPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 1959b18b37beSPhilipp Reisner cmdname(cmd)); 1960b18b37beSPhilipp Reisner } 1961b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 1962b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 1963b411b363SPhilipp Reisner "no local data.\n"); 1964b18b37beSPhilipp Reisner 1965a821cc4aSLars Ellenberg /* drain possibly payload */ 1966a821cc4aSLars Ellenberg return drbd_drain_block(mdev, digest_size); 1967b411b363SPhilipp Reisner } 1968b411b363SPhilipp Reisner 1969b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1970b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1971b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1972b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); 1973b411b363SPhilipp Reisner if (!e) { 1974b411b363SPhilipp Reisner put_ldev(mdev); 197581e84650SAndreas Gruenbacher return false; 1976b411b363SPhilipp Reisner } 1977b411b363SPhilipp Reisner 197802918be2SPhilipp Reisner switch (cmd) { 1979b411b363SPhilipp Reisner case P_DATA_REQUEST: 1980b411b363SPhilipp Reisner e->w.cb = w_e_end_data_req; 1981b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 198280a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 198380a40e43SLars Ellenberg goto submit; 198480a40e43SLars Ellenberg 1985b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 1986b411b363SPhilipp Reisner e->w.cb = w_e_end_rsdata_req; 1987b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 19885f9915bbSLars Ellenberg /* used in the sector offset progress display */ 19895f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 1990b411b363SPhilipp Reisner break; 1991b411b363SPhilipp Reisner 1992b411b363SPhilipp Reisner case P_OV_REPLY: 1993b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 1994b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 1995b411b363SPhilipp Reisner di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); 1996b411b363SPhilipp Reisner if (!di) 1997b411b363SPhilipp Reisner goto out_free_e; 1998b411b363SPhilipp Reisner 1999b411b363SPhilipp Reisner di->digest_size = digest_size; 2000b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2001b411b363SPhilipp Reisner 2002c36c3cedSLars Ellenberg e->digest = di; 2003c36c3cedSLars Ellenberg e->flags |= EE_HAS_DIGEST; 2004c36c3cedSLars Ellenberg 2005b411b363SPhilipp Reisner if (drbd_recv(mdev, di->digest, digest_size) != digest_size) 2006b411b363SPhilipp Reisner goto out_free_e; 2007b411b363SPhilipp Reisner 200802918be2SPhilipp Reisner if (cmd == P_CSUM_RS_REQUEST) { 2009b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 2010b411b363SPhilipp Reisner e->w.cb = w_e_end_csum_rs_req; 20115f9915bbSLars Ellenberg /* used in the sector offset progress display */ 20125f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 201302918be2SPhilipp Reisner } else if (cmd == P_OV_REPLY) { 20142649f080SLars Ellenberg /* track progress, we may need to throttle */ 20152649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2016b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_reply; 2017b411b363SPhilipp Reisner dec_rs_pending(mdev); 20180f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 20190f0601f4SLars Ellenberg * but accounting still needs to be done. */ 20200f0601f4SLars Ellenberg goto submit_for_resync; 2021b411b363SPhilipp Reisner } 2022b411b363SPhilipp Reisner break; 2023b411b363SPhilipp Reisner 2024b411b363SPhilipp Reisner case P_OV_REQUEST: 2025b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 2026b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90) { 2027de228bbaSLars Ellenberg unsigned long now = jiffies; 2028de228bbaSLars Ellenberg int i; 2029b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2030b411b363SPhilipp Reisner mdev->ov_position = sector; 203130b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 203230b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2033de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2034de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2035de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2036de228bbaSLars Ellenberg } 2037b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2038b411b363SPhilipp Reisner (unsigned long long)sector); 2039b411b363SPhilipp Reisner } 2040b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_req; 2041b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2042b411b363SPhilipp Reisner break; 2043b411b363SPhilipp Reisner 2044b411b363SPhilipp Reisner default: 2045b411b363SPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 204602918be2SPhilipp Reisner cmdname(cmd)); 2047b411b363SPhilipp Reisner fault_type = DRBD_FAULT_MAX; 204880a40e43SLars Ellenberg goto out_free_e; 2049b411b363SPhilipp Reisner } 2050b411b363SPhilipp Reisner 20510f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 20520f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 20530f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 20540f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 20550f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 20560f0601f4SLars Ellenberg * 20570f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 20580f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 20590f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 20600f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 20610f0601f4SLars Ellenberg * a while, anyways. 20620f0601f4SLars Ellenberg */ 2063b411b363SPhilipp Reisner 20640f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 20650f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 20660f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 20670f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 20680f0601f4SLars Ellenberg * 20690f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 20700f0601f4SLars Ellenberg * we would also throttle its application reads. 20710f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 20720f0601f4SLars Ellenberg */ 2073e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2074e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2075e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 207680a40e43SLars Ellenberg goto out_free_e; 2077b411b363SPhilipp Reisner 20780f0601f4SLars Ellenberg submit_for_resync: 20790f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 20800f0601f4SLars Ellenberg 208180a40e43SLars Ellenberg submit: 2082b411b363SPhilipp Reisner inc_unacked(mdev); 208380a40e43SLars Ellenberg spin_lock_irq(&mdev->req_lock); 208480a40e43SLars Ellenberg list_add_tail(&e->w.list, &mdev->read_ee); 208580a40e43SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 2086b411b363SPhilipp Reisner 208745bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, READ, fault_type) == 0) 208881e84650SAndreas Gruenbacher return true; 2089b411b363SPhilipp Reisner 209022cc37a9SLars Ellenberg /* drbd_submit_ee currently fails for one reason only: 209122cc37a9SLars Ellenberg * not being able to allocate enough bios. 209222cc37a9SLars Ellenberg * Is dropping the connection going to help? */ 209322cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 209422cc37a9SLars Ellenberg list_del(&e->w.list); 209522cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 209622cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 209722cc37a9SLars Ellenberg 2098b411b363SPhilipp Reisner out_free_e: 2099b411b363SPhilipp Reisner put_ldev(mdev); 2100b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 210181e84650SAndreas Gruenbacher return false; 2102b411b363SPhilipp Reisner } 2103b411b363SPhilipp Reisner 2104b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2105b411b363SPhilipp Reisner { 2106b411b363SPhilipp Reisner int self, peer, rv = -100; 2107b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 2108b411b363SPhilipp Reisner 2109b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2110b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2111b411b363SPhilipp Reisner 2112b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2113b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2114b411b363SPhilipp Reisner 2115b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_0p) { 2116b411b363SPhilipp Reisner case ASB_CONSENSUS: 2117b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2118b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2119b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2120b411b363SPhilipp Reisner break; 2121b411b363SPhilipp Reisner case ASB_DISCONNECT: 2122b411b363SPhilipp Reisner break; 2123b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2124b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2125b411b363SPhilipp Reisner rv = -1; 2126b411b363SPhilipp Reisner break; 2127b411b363SPhilipp Reisner } 2128b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2129b411b363SPhilipp Reisner rv = 1; 2130b411b363SPhilipp Reisner break; 2131b411b363SPhilipp Reisner } 2132b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2133b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2134b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2135b411b363SPhilipp Reisner rv = 1; 2136b411b363SPhilipp Reisner break; 2137b411b363SPhilipp Reisner } 2138b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2139b411b363SPhilipp Reisner rv = -1; 2140b411b363SPhilipp Reisner break; 2141b411b363SPhilipp Reisner } 2142b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2143ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2144b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2145b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2146b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 2147b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2148b411b363SPhilipp Reisner ? -1 : 1; 2149b411b363SPhilipp Reisner break; 2150b411b363SPhilipp Reisner } else { 2151b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2152b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2153b411b363SPhilipp Reisner } 2154b411b363SPhilipp Reisner if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) 2155b411b363SPhilipp Reisner break; 2156b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2157b411b363SPhilipp Reisner if (ch_self < ch_peer) 2158b411b363SPhilipp Reisner rv = -1; 2159b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2160b411b363SPhilipp Reisner rv = 1; 2161b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2162b411b363SPhilipp Reisner /* Well, then use something else. */ 2163b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2164b411b363SPhilipp Reisner ? -1 : 1; 2165b411b363SPhilipp Reisner break; 2166b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2167b411b363SPhilipp Reisner rv = -1; 2168b411b363SPhilipp Reisner break; 2169b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2170b411b363SPhilipp Reisner rv = 1; 2171b411b363SPhilipp Reisner } 2172b411b363SPhilipp Reisner 2173b411b363SPhilipp Reisner return rv; 2174b411b363SPhilipp Reisner } 2175b411b363SPhilipp Reisner 2176b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2177b411b363SPhilipp Reisner { 21786184ea21SAndreas Gruenbacher int hg, rv = -100; 2179b411b363SPhilipp Reisner 2180b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_1p) { 2181b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2182b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2183b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2184b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2185b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2186b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2187b411b363SPhilipp Reisner break; 2188b411b363SPhilipp Reisner case ASB_DISCONNECT: 2189b411b363SPhilipp Reisner break; 2190b411b363SPhilipp Reisner case ASB_CONSENSUS: 2191b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2192b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2193b411b363SPhilipp Reisner rv = hg; 2194b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2195b411b363SPhilipp Reisner rv = hg; 2196b411b363SPhilipp Reisner break; 2197b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2198b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2199b411b363SPhilipp Reisner break; 2200b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2201b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2202b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2203b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2204b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2205bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2206bb437946SAndreas Gruenbacher 2207bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2208b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2209b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2210b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2211bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2212bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2213b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2214b411b363SPhilipp Reisner } else { 2215b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2216b411b363SPhilipp Reisner rv = hg; 2217b411b363SPhilipp Reisner } 2218b411b363SPhilipp Reisner } else 2219b411b363SPhilipp Reisner rv = hg; 2220b411b363SPhilipp Reisner } 2221b411b363SPhilipp Reisner 2222b411b363SPhilipp Reisner return rv; 2223b411b363SPhilipp Reisner } 2224b411b363SPhilipp Reisner 2225b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2226b411b363SPhilipp Reisner { 22276184ea21SAndreas Gruenbacher int hg, rv = -100; 2228b411b363SPhilipp Reisner 2229b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_2p) { 2230b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2231b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2232b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2233b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2234b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2235b411b363SPhilipp Reisner case ASB_CONSENSUS: 2236b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2237b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2238b411b363SPhilipp Reisner break; 2239b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2240b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2241b411b363SPhilipp Reisner break; 2242b411b363SPhilipp Reisner case ASB_DISCONNECT: 2243b411b363SPhilipp Reisner break; 2244b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2245b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2246b411b363SPhilipp Reisner if (hg == -1) { 2247bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2248bb437946SAndreas Gruenbacher 2249b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2250b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2251b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2252bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2253bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2254b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2255b411b363SPhilipp Reisner } else { 2256b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2257b411b363SPhilipp Reisner rv = hg; 2258b411b363SPhilipp Reisner } 2259b411b363SPhilipp Reisner } else 2260b411b363SPhilipp Reisner rv = hg; 2261b411b363SPhilipp Reisner } 2262b411b363SPhilipp Reisner 2263b411b363SPhilipp Reisner return rv; 2264b411b363SPhilipp Reisner } 2265b411b363SPhilipp Reisner 2266b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2267b411b363SPhilipp Reisner u64 bits, u64 flags) 2268b411b363SPhilipp Reisner { 2269b411b363SPhilipp Reisner if (!uuid) { 2270b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2271b411b363SPhilipp Reisner return; 2272b411b363SPhilipp Reisner } 2273b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2274b411b363SPhilipp Reisner text, 2275b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2276b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2277b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2278b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2279b411b363SPhilipp Reisner (unsigned long long)bits, 2280b411b363SPhilipp Reisner (unsigned long long)flags); 2281b411b363SPhilipp Reisner } 2282b411b363SPhilipp Reisner 2283b411b363SPhilipp Reisner /* 2284b411b363SPhilipp Reisner 100 after split brain try auto recover 2285b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2286b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2287b411b363SPhilipp Reisner 0 no Sync 2288b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2289b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2290b411b363SPhilipp Reisner -100 after split brain, disconnect 2291b411b363SPhilipp Reisner -1000 unrelated data 22924a23f264SPhilipp Reisner -1091 requires proto 91 22934a23f264SPhilipp Reisner -1096 requires proto 96 2294b411b363SPhilipp Reisner */ 2295b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2296b411b363SPhilipp Reisner { 2297b411b363SPhilipp Reisner u64 self, peer; 2298b411b363SPhilipp Reisner int i, j; 2299b411b363SPhilipp Reisner 2300b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2301b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2302b411b363SPhilipp Reisner 2303b411b363SPhilipp Reisner *rule_nr = 10; 2304b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2305b411b363SPhilipp Reisner return 0; 2306b411b363SPhilipp Reisner 2307b411b363SPhilipp Reisner *rule_nr = 20; 2308b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2309b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2310b411b363SPhilipp Reisner return -2; 2311b411b363SPhilipp Reisner 2312b411b363SPhilipp Reisner *rule_nr = 30; 2313b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2314b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2315b411b363SPhilipp Reisner return 2; 2316b411b363SPhilipp Reisner 2317b411b363SPhilipp Reisner if (self == peer) { 2318b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2319b411b363SPhilipp Reisner 2320b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2321b411b363SPhilipp Reisner 2322b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 23234a23f264SPhilipp Reisner return -1091; 2324b411b363SPhilipp Reisner 2325b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2326b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2327b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2328b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2329b411b363SPhilipp Reisner 2330b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2331b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2332b411b363SPhilipp Reisner *rule_nr = 34; 2333b411b363SPhilipp Reisner } else { 2334b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2335b411b363SPhilipp Reisner *rule_nr = 36; 2336b411b363SPhilipp Reisner } 2337b411b363SPhilipp Reisner 2338b411b363SPhilipp Reisner return 1; 2339b411b363SPhilipp Reisner } 2340b411b363SPhilipp Reisner 2341b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2342b411b363SPhilipp Reisner 2343b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 23444a23f264SPhilipp Reisner return -1091; 2345b411b363SPhilipp Reisner 2346b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2347b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2348b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2349b411b363SPhilipp Reisner 2350b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2351b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2352b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2353b411b363SPhilipp Reisner 2354b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2355b411b363SPhilipp Reisner *rule_nr = 35; 2356b411b363SPhilipp Reisner } else { 2357b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2358b411b363SPhilipp Reisner *rule_nr = 37; 2359b411b363SPhilipp Reisner } 2360b411b363SPhilipp Reisner 2361b411b363SPhilipp Reisner return -1; 2362b411b363SPhilipp Reisner } 2363b411b363SPhilipp Reisner 2364b411b363SPhilipp Reisner /* Common power [off|failure] */ 2365b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2366b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2367b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2368b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2369b411b363SPhilipp Reisner *rule_nr = 40; 2370b411b363SPhilipp Reisner 2371b411b363SPhilipp Reisner switch (rct) { 2372b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2373b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2374b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2375b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 2376b411b363SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->flags); 2377b411b363SPhilipp Reisner return dc ? -1 : 1; 2378b411b363SPhilipp Reisner } 2379b411b363SPhilipp Reisner } 2380b411b363SPhilipp Reisner 2381b411b363SPhilipp Reisner *rule_nr = 50; 2382b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2383b411b363SPhilipp Reisner if (self == peer) 2384b411b363SPhilipp Reisner return -1; 2385b411b363SPhilipp Reisner 2386b411b363SPhilipp Reisner *rule_nr = 51; 2387b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2388b411b363SPhilipp Reisner if (self == peer) { 23894a23f264SPhilipp Reisner if (mdev->agreed_pro_version < 96 ? 23904a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 23914a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 23924a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2393b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2394b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2395b411b363SPhilipp Reisner 2396b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 23974a23f264SPhilipp Reisner return -1091; 2398b411b363SPhilipp Reisner 2399b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2400b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 24014a23f264SPhilipp Reisner 24024a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 24034a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 24044a23f264SPhilipp Reisner 2405b411b363SPhilipp Reisner return -1; 2406b411b363SPhilipp Reisner } 2407b411b363SPhilipp Reisner } 2408b411b363SPhilipp Reisner 2409b411b363SPhilipp Reisner *rule_nr = 60; 2410b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2411b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2412b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2413b411b363SPhilipp Reisner if (self == peer) 2414b411b363SPhilipp Reisner return -2; 2415b411b363SPhilipp Reisner } 2416b411b363SPhilipp Reisner 2417b411b363SPhilipp Reisner *rule_nr = 70; 2418b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2419b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2420b411b363SPhilipp Reisner if (self == peer) 2421b411b363SPhilipp Reisner return 1; 2422b411b363SPhilipp Reisner 2423b411b363SPhilipp Reisner *rule_nr = 71; 2424b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2425b411b363SPhilipp Reisner if (self == peer) { 24264a23f264SPhilipp Reisner if (mdev->agreed_pro_version < 96 ? 24274a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 24284a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 24294a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2430b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2431b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2432b411b363SPhilipp Reisner 2433b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 24344a23f264SPhilipp Reisner return -1091; 2435b411b363SPhilipp Reisner 2436b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2437b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2438b411b363SPhilipp Reisner 24394a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2440b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2441b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2442b411b363SPhilipp Reisner 2443b411b363SPhilipp Reisner return 1; 2444b411b363SPhilipp Reisner } 2445b411b363SPhilipp Reisner } 2446b411b363SPhilipp Reisner 2447b411b363SPhilipp Reisner 2448b411b363SPhilipp Reisner *rule_nr = 80; 2449d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2450b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2451b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2452b411b363SPhilipp Reisner if (self == peer) 2453b411b363SPhilipp Reisner return 2; 2454b411b363SPhilipp Reisner } 2455b411b363SPhilipp Reisner 2456b411b363SPhilipp Reisner *rule_nr = 90; 2457b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2458b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2459b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2460b411b363SPhilipp Reisner return 100; 2461b411b363SPhilipp Reisner 2462b411b363SPhilipp Reisner *rule_nr = 100; 2463b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2464b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2465b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2466b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2467b411b363SPhilipp Reisner if (self == peer) 2468b411b363SPhilipp Reisner return -100; 2469b411b363SPhilipp Reisner } 2470b411b363SPhilipp Reisner } 2471b411b363SPhilipp Reisner 2472b411b363SPhilipp Reisner return -1000; 2473b411b363SPhilipp Reisner } 2474b411b363SPhilipp Reisner 2475b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2476b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2477b411b363SPhilipp Reisner */ 2478b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2479b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2480b411b363SPhilipp Reisner { 2481b411b363SPhilipp Reisner int hg, rule_nr; 2482b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2483b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 2484b411b363SPhilipp Reisner 2485b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2486b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2487b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2488b411b363SPhilipp Reisner 2489b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2490b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2491b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2492b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2493b411b363SPhilipp Reisner 2494b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2495b411b363SPhilipp Reisner 2496b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2497b411b363SPhilipp Reisner 2498b411b363SPhilipp Reisner if (hg == -1000) { 2499b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2500b411b363SPhilipp Reisner return C_MASK; 2501b411b363SPhilipp Reisner } 25024a23f264SPhilipp Reisner if (hg < -1000) { 25034a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2504b411b363SPhilipp Reisner return C_MASK; 2505b411b363SPhilipp Reisner } 2506b411b363SPhilipp Reisner 2507b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2508b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2509b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2510b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2511b411b363SPhilipp Reisner if (f) 2512b411b363SPhilipp Reisner hg = hg*2; 2513b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2514b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2515b411b363SPhilipp Reisner } 2516b411b363SPhilipp Reisner 25173a11a487SAdam Gandelman if (abs(hg) == 100) 25183a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 25193a11a487SAdam Gandelman 2520b411b363SPhilipp Reisner if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) { 2521b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2522b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2523b411b363SPhilipp Reisner int forced = (hg == -100); 2524b411b363SPhilipp Reisner 2525b411b363SPhilipp Reisner switch (pcount) { 2526b411b363SPhilipp Reisner case 0: 2527b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2528b411b363SPhilipp Reisner break; 2529b411b363SPhilipp Reisner case 1: 2530b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2531b411b363SPhilipp Reisner break; 2532b411b363SPhilipp Reisner case 2: 2533b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2534b411b363SPhilipp Reisner break; 2535b411b363SPhilipp Reisner } 2536b411b363SPhilipp Reisner if (abs(hg) < 100) { 2537b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2538b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2539b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2540b411b363SPhilipp Reisner if (forced) { 2541b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2542b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2543b411b363SPhilipp Reisner hg = hg*2; 2544b411b363SPhilipp Reisner } 2545b411b363SPhilipp Reisner } 2546b411b363SPhilipp Reisner } 2547b411b363SPhilipp Reisner 2548b411b363SPhilipp Reisner if (hg == -100) { 2549b411b363SPhilipp Reisner if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2550b411b363SPhilipp Reisner hg = -1; 2551b411b363SPhilipp Reisner if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2552b411b363SPhilipp Reisner hg = 1; 2553b411b363SPhilipp Reisner 2554b411b363SPhilipp Reisner if (abs(hg) < 100) 2555b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2556b411b363SPhilipp Reisner "Sync from %s node\n", 2557b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2558b411b363SPhilipp Reisner } 2559b411b363SPhilipp Reisner 2560b411b363SPhilipp Reisner if (hg == -100) { 2561580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2562580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2563580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2564580b9767SLars Ellenberg * to that disk, in a way... */ 25653a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2566b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2567b411b363SPhilipp Reisner return C_MASK; 2568b411b363SPhilipp Reisner } 2569b411b363SPhilipp Reisner 2570b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2571b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2572b411b363SPhilipp Reisner return C_MASK; 2573b411b363SPhilipp Reisner } 2574b411b363SPhilipp Reisner 2575b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2576b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 2577b411b363SPhilipp Reisner switch (mdev->net_conf->rr_conflict) { 2578b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2579b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2580b411b363SPhilipp Reisner /* fall through */ 2581b411b363SPhilipp Reisner case ASB_DISCONNECT: 2582b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2583b411b363SPhilipp Reisner return C_MASK; 2584b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2585b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2586b411b363SPhilipp Reisner "assumption\n"); 2587b411b363SPhilipp Reisner } 2588b411b363SPhilipp Reisner } 2589b411b363SPhilipp Reisner 2590cf14c2e9SPhilipp Reisner if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { 2591cf14c2e9SPhilipp Reisner if (hg == 0) 2592cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2593cf14c2e9SPhilipp Reisner else 2594cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2595cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2596cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2597cf14c2e9SPhilipp Reisner return C_MASK; 2598cf14c2e9SPhilipp Reisner } 2599cf14c2e9SPhilipp Reisner 2600b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2601b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 260220ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 260320ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 2604b411b363SPhilipp Reisner return C_MASK; 2605b411b363SPhilipp Reisner } 2606b411b363SPhilipp Reisner 2607b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2608b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2609b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2610b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2611b411b363SPhilipp Reisner } else { 2612b411b363SPhilipp Reisner rv = C_CONNECTED; 2613b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2614b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2615b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2616b411b363SPhilipp Reisner } 2617b411b363SPhilipp Reisner } 2618b411b363SPhilipp Reisner 2619b411b363SPhilipp Reisner return rv; 2620b411b363SPhilipp Reisner } 2621b411b363SPhilipp Reisner 2622b411b363SPhilipp Reisner /* returns 1 if invalid */ 2623b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2624b411b363SPhilipp Reisner { 2625b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2626b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2627b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2628b411b363SPhilipp Reisner return 0; 2629b411b363SPhilipp Reisner 2630b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2631b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2632b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2633b411b363SPhilipp Reisner return 1; 2634b411b363SPhilipp Reisner 2635b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2636b411b363SPhilipp Reisner if (peer == self) 2637b411b363SPhilipp Reisner return 0; 2638b411b363SPhilipp Reisner 2639b411b363SPhilipp Reisner /* everything es is invalid. */ 2640b411b363SPhilipp Reisner return 1; 2641b411b363SPhilipp Reisner } 2642b411b363SPhilipp Reisner 264302918be2SPhilipp Reisner static int receive_protocol(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 2644b411b363SPhilipp Reisner { 264502918be2SPhilipp Reisner struct p_protocol *p = &mdev->data.rbuf.protocol; 2646b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2647cf14c2e9SPhilipp Reisner int p_want_lose, p_two_primaries, cf; 2648b411b363SPhilipp Reisner char p_integrity_alg[SHARED_SECRET_MAX] = ""; 2649b411b363SPhilipp Reisner 2650b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2651b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 2652b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 2653b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 2654b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 2655cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 2656cf14c2e9SPhilipp Reisner p_want_lose = cf & CF_WANT_LOSE; 2657cf14c2e9SPhilipp Reisner 2658cf14c2e9SPhilipp Reisner clear_bit(CONN_DRY_RUN, &mdev->flags); 2659cf14c2e9SPhilipp Reisner 2660cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 2661cf14c2e9SPhilipp Reisner set_bit(CONN_DRY_RUN, &mdev->flags); 2662b411b363SPhilipp Reisner 2663b411b363SPhilipp Reisner if (p_proto != mdev->net_conf->wire_protocol) { 2664b411b363SPhilipp Reisner dev_err(DEV, "incompatible communication protocols\n"); 2665b411b363SPhilipp Reisner goto disconnect; 2666b411b363SPhilipp Reisner } 2667b411b363SPhilipp Reisner 2668b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) { 2669b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-0pri settings\n"); 2670b411b363SPhilipp Reisner goto disconnect; 2671b411b363SPhilipp Reisner } 2672b411b363SPhilipp Reisner 2673b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) { 2674b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-1pri settings\n"); 2675b411b363SPhilipp Reisner goto disconnect; 2676b411b363SPhilipp Reisner } 2677b411b363SPhilipp Reisner 2678b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) { 2679b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-2pri settings\n"); 2680b411b363SPhilipp Reisner goto disconnect; 2681b411b363SPhilipp Reisner } 2682b411b363SPhilipp Reisner 2683b411b363SPhilipp Reisner if (p_want_lose && mdev->net_conf->want_lose) { 2684b411b363SPhilipp Reisner dev_err(DEV, "both sides have the 'want_lose' flag set\n"); 2685b411b363SPhilipp Reisner goto disconnect; 2686b411b363SPhilipp Reisner } 2687b411b363SPhilipp Reisner 2688b411b363SPhilipp Reisner if (p_two_primaries != mdev->net_conf->two_primaries) { 2689b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the two-primaries options\n"); 2690b411b363SPhilipp Reisner goto disconnect; 2691b411b363SPhilipp Reisner } 2692b411b363SPhilipp Reisner 2693b411b363SPhilipp Reisner if (mdev->agreed_pro_version >= 87) { 2694b411b363SPhilipp Reisner unsigned char *my_alg = mdev->net_conf->integrity_alg; 2695b411b363SPhilipp Reisner 2696b411b363SPhilipp Reisner if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) 269781e84650SAndreas Gruenbacher return false; 2698b411b363SPhilipp Reisner 2699b411b363SPhilipp Reisner p_integrity_alg[SHARED_SECRET_MAX-1] = 0; 2700b411b363SPhilipp Reisner if (strcmp(p_integrity_alg, my_alg)) { 2701b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); 2702b411b363SPhilipp Reisner goto disconnect; 2703b411b363SPhilipp Reisner } 2704b411b363SPhilipp Reisner dev_info(DEV, "data-integrity-alg: %s\n", 2705b411b363SPhilipp Reisner my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); 2706b411b363SPhilipp Reisner } 2707b411b363SPhilipp Reisner 270881e84650SAndreas Gruenbacher return true; 2709b411b363SPhilipp Reisner 2710b411b363SPhilipp Reisner disconnect: 2711b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 271281e84650SAndreas Gruenbacher return false; 2713b411b363SPhilipp Reisner } 2714b411b363SPhilipp Reisner 2715b411b363SPhilipp Reisner /* helper function 2716b411b363SPhilipp Reisner * input: alg name, feature name 2717b411b363SPhilipp Reisner * return: NULL (alg name was "") 2718b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 2719b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 2720b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 2721b411b363SPhilipp Reisner const char *alg, const char *name) 2722b411b363SPhilipp Reisner { 2723b411b363SPhilipp Reisner struct crypto_hash *tfm; 2724b411b363SPhilipp Reisner 2725b411b363SPhilipp Reisner if (!alg[0]) 2726b411b363SPhilipp Reisner return NULL; 2727b411b363SPhilipp Reisner 2728b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 2729b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 2730b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 2731b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 2732b411b363SPhilipp Reisner return tfm; 2733b411b363SPhilipp Reisner } 2734b411b363SPhilipp Reisner if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 2735b411b363SPhilipp Reisner crypto_free_hash(tfm); 2736b411b363SPhilipp Reisner dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); 2737b411b363SPhilipp Reisner return ERR_PTR(-EINVAL); 2738b411b363SPhilipp Reisner } 2739b411b363SPhilipp Reisner return tfm; 2740b411b363SPhilipp Reisner } 2741b411b363SPhilipp Reisner 274202918be2SPhilipp Reisner static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int packet_size) 2743b411b363SPhilipp Reisner { 274481e84650SAndreas Gruenbacher int ok = true; 274502918be2SPhilipp Reisner struct p_rs_param_95 *p = &mdev->data.rbuf.rs_param_95; 2746b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 2747b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 2748b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 2749b411b363SPhilipp Reisner const int apv = mdev->agreed_pro_version; 2750778f271dSPhilipp Reisner int *rs_plan_s = NULL; 2751778f271dSPhilipp Reisner int fifo_size = 0; 2752b411b363SPhilipp Reisner 2753b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 2754b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 2755b411b363SPhilipp Reisner + SHARED_SECRET_MAX 27568e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 27578e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 2758b411b363SPhilipp Reisner 275902918be2SPhilipp Reisner if (packet_size > exp_max_sz) { 2760b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 276102918be2SPhilipp Reisner packet_size, exp_max_sz); 276281e84650SAndreas Gruenbacher return false; 2763b411b363SPhilipp Reisner } 2764b411b363SPhilipp Reisner 2765b411b363SPhilipp Reisner if (apv <= 88) { 276602918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param) - sizeof(struct p_header80); 276702918be2SPhilipp Reisner data_size = packet_size - header_size; 27688e26f9ccSPhilipp Reisner } else if (apv <= 94) { 276902918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header80); 277002918be2SPhilipp Reisner data_size = packet_size - header_size; 2771b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 27728e26f9ccSPhilipp Reisner } else { 277302918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header80); 277402918be2SPhilipp Reisner data_size = packet_size - header_size; 2775b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 2776b411b363SPhilipp Reisner } 2777b411b363SPhilipp Reisner 2778b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 2779b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 2780b411b363SPhilipp Reisner 278102918be2SPhilipp Reisner if (drbd_recv(mdev, &p->head.payload, header_size) != header_size) 278281e84650SAndreas Gruenbacher return false; 2783b411b363SPhilipp Reisner 2784b411b363SPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 2785b411b363SPhilipp Reisner 2786b411b363SPhilipp Reisner if (apv >= 88) { 2787b411b363SPhilipp Reisner if (apv == 88) { 2788b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 2789b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 2790b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 2791b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 279281e84650SAndreas Gruenbacher return false; 2793b411b363SPhilipp Reisner } 2794b411b363SPhilipp Reisner 2795b411b363SPhilipp Reisner if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) 279681e84650SAndreas Gruenbacher return false; 2797b411b363SPhilipp Reisner 2798b411b363SPhilipp Reisner /* we expect NUL terminated string */ 2799b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2800b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 2801b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 2802b411b363SPhilipp Reisner 2803b411b363SPhilipp Reisner } else /* apv >= 89 */ { 2804b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 2805b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2806b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 2807b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 2808b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 2809b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 2810b411b363SPhilipp Reisner } 2811b411b363SPhilipp Reisner 2812b411b363SPhilipp Reisner if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { 2813b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2814b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 2815b411b363SPhilipp Reisner mdev->sync_conf.verify_alg, p->verify_alg); 2816b411b363SPhilipp Reisner goto disconnect; 2817b411b363SPhilipp Reisner } 2818b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 2819b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 2820b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 2821b411b363SPhilipp Reisner verify_tfm = NULL; 2822b411b363SPhilipp Reisner goto disconnect; 2823b411b363SPhilipp Reisner } 2824b411b363SPhilipp Reisner } 2825b411b363SPhilipp Reisner 2826b411b363SPhilipp Reisner if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { 2827b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2828b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 2829b411b363SPhilipp Reisner mdev->sync_conf.csums_alg, p->csums_alg); 2830b411b363SPhilipp Reisner goto disconnect; 2831b411b363SPhilipp Reisner } 2832b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 2833b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 2834b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 2835b411b363SPhilipp Reisner csums_tfm = NULL; 2836b411b363SPhilipp Reisner goto disconnect; 2837b411b363SPhilipp Reisner } 2838b411b363SPhilipp Reisner } 2839b411b363SPhilipp Reisner 28408e26f9ccSPhilipp Reisner if (apv > 94) { 28418e26f9ccSPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 28428e26f9ccSPhilipp Reisner mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 28438e26f9ccSPhilipp Reisner mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target); 28448e26f9ccSPhilipp Reisner mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target); 28458e26f9ccSPhilipp Reisner mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate); 2846778f271dSPhilipp Reisner 2847778f271dSPhilipp Reisner fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 2848778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 2849778f271dSPhilipp Reisner rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 2850778f271dSPhilipp Reisner if (!rs_plan_s) { 2851778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 2852778f271dSPhilipp Reisner goto disconnect; 2853778f271dSPhilipp Reisner } 2854778f271dSPhilipp Reisner } 28558e26f9ccSPhilipp Reisner } 2856b411b363SPhilipp Reisner 2857b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 2858b411b363SPhilipp Reisner /* lock against drbd_nl_syncer_conf() */ 2859b411b363SPhilipp Reisner if (verify_tfm) { 2860b411b363SPhilipp Reisner strcpy(mdev->sync_conf.verify_alg, p->verify_alg); 2861b411b363SPhilipp Reisner mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; 2862b411b363SPhilipp Reisner crypto_free_hash(mdev->verify_tfm); 2863b411b363SPhilipp Reisner mdev->verify_tfm = verify_tfm; 2864b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 2865b411b363SPhilipp Reisner } 2866b411b363SPhilipp Reisner if (csums_tfm) { 2867b411b363SPhilipp Reisner strcpy(mdev->sync_conf.csums_alg, p->csums_alg); 2868b411b363SPhilipp Reisner mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; 2869b411b363SPhilipp Reisner crypto_free_hash(mdev->csums_tfm); 2870b411b363SPhilipp Reisner mdev->csums_tfm = csums_tfm; 2871b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 2872b411b363SPhilipp Reisner } 2873778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size) { 2874778f271dSPhilipp Reisner kfree(mdev->rs_plan_s.values); 2875778f271dSPhilipp Reisner mdev->rs_plan_s.values = rs_plan_s; 2876778f271dSPhilipp Reisner mdev->rs_plan_s.size = fifo_size; 2877778f271dSPhilipp Reisner mdev->rs_planed = 0; 2878778f271dSPhilipp Reisner } 2879b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 2880b411b363SPhilipp Reisner } 2881b411b363SPhilipp Reisner 2882b411b363SPhilipp Reisner return ok; 2883b411b363SPhilipp Reisner disconnect: 2884b411b363SPhilipp Reisner /* just for completeness: actually not needed, 2885b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 2886b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 2887b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 2888b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 2889b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 289081e84650SAndreas Gruenbacher return false; 2891b411b363SPhilipp Reisner } 2892b411b363SPhilipp Reisner 2893b411b363SPhilipp Reisner static void drbd_setup_order_type(struct drbd_conf *mdev, int peer) 2894b411b363SPhilipp Reisner { 2895b411b363SPhilipp Reisner /* sorry, we currently have no working implementation 2896b411b363SPhilipp Reisner * of distributed TCQ */ 2897b411b363SPhilipp Reisner } 2898b411b363SPhilipp Reisner 2899b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 2900b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 2901b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 2902b411b363SPhilipp Reisner { 2903b411b363SPhilipp Reisner sector_t d; 2904b411b363SPhilipp Reisner if (a == 0 || b == 0) 2905b411b363SPhilipp Reisner return; 2906b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 2907b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 2908b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 2909b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 2910b411b363SPhilipp Reisner } 2911b411b363SPhilipp Reisner 291202918be2SPhilipp Reisner static int receive_sizes(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 2913b411b363SPhilipp Reisner { 291402918be2SPhilipp Reisner struct p_sizes *p = &mdev->data.rbuf.sizes; 2915b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 29161816a2b4SLars Ellenberg unsigned int max_bio_size; 2917b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 2918b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 2919e89b591cSPhilipp Reisner enum dds_flags ddsf; 2920b411b363SPhilipp Reisner 2921b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 2922b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 2923b411b363SPhilipp Reisner 2924b411b363SPhilipp Reisner if (p_size == 0 && mdev->state.disk == D_DISKLESS) { 2925b411b363SPhilipp Reisner dev_err(DEV, "some backing storage is needed\n"); 2926b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 292781e84650SAndreas Gruenbacher return false; 2928b411b363SPhilipp Reisner } 2929b411b363SPhilipp Reisner 2930b411b363SPhilipp Reisner /* just store the peer's disk size for now. 2931b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 2932b411b363SPhilipp Reisner mdev->p_size = p_size; 2933b411b363SPhilipp Reisner 2934b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2935b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 2936b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 2937b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 2938b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 2939b411b363SPhilipp Reisner 2940b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 2941b411b363SPhilipp Reisner * param exchange, choose the minimum */ 2942b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 2943b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 2944b411b363SPhilipp Reisner p_usize); 2945b411b363SPhilipp Reisner 2946b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 2947b411b363SPhilipp Reisner 2948b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 2949b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 2950b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 2951b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 2952b411b363SPhilipp Reisner } 2953b411b363SPhilipp Reisner 2954b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 2955b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 2956a393db6fSPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, 0) < 2957b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 2958b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 2959b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 2960b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 2961b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2962b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 2963b411b363SPhilipp Reisner put_ldev(mdev); 296481e84650SAndreas Gruenbacher return false; 2965b411b363SPhilipp Reisner } 2966b411b363SPhilipp Reisner put_ldev(mdev); 2967b411b363SPhilipp Reisner } 2968b411b363SPhilipp Reisner 2969e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 2970b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2971e89b591cSPhilipp Reisner dd = drbd_determin_dev_size(mdev, ddsf); 2972b411b363SPhilipp Reisner put_ldev(mdev); 2973b411b363SPhilipp Reisner if (dd == dev_size_error) 297481e84650SAndreas Gruenbacher return false; 2975b411b363SPhilipp Reisner drbd_md_sync(mdev); 2976b411b363SPhilipp Reisner } else { 2977b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 2978b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 2979b411b363SPhilipp Reisner } 2980b411b363SPhilipp Reisner 2981b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2982b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 2983b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 2984b411b363SPhilipp Reisner ldsc = 1; 2985b411b363SPhilipp Reisner } 2986b411b363SPhilipp Reisner 2987a1c88d0dSLars Ellenberg if (mdev->agreed_pro_version < 94) 29881816a2b4SLars Ellenberg max_bio_size = be32_to_cpu(p->max_bio_size); 29898979d9c9SLars Ellenberg else if (mdev->agreed_pro_version == 94) 29901816a2b4SLars Ellenberg max_bio_size = DRBD_MAX_SIZE_H80_PACKET; 2991a1c88d0dSLars Ellenberg else /* drbd 8.3.8 onwards */ 29921816a2b4SLars Ellenberg max_bio_size = DRBD_MAX_BIO_SIZE; 2993a1c88d0dSLars Ellenberg 29941816a2b4SLars Ellenberg if (max_bio_size != queue_max_hw_sectors(mdev->rq_queue) << 9) 29951816a2b4SLars Ellenberg drbd_setup_queue_param(mdev, max_bio_size); 2996b411b363SPhilipp Reisner 2997e89b591cSPhilipp Reisner drbd_setup_order_type(mdev, be16_to_cpu(p->queue_order_type)); 2998b411b363SPhilipp Reisner put_ldev(mdev); 2999b411b363SPhilipp Reisner } 3000b411b363SPhilipp Reisner 3001b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3002b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3003b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3004b411b363SPhilipp Reisner /* we have different sizes, probably peer 3005b411b363SPhilipp Reisner * needs to know my new size... */ 3006e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3007b411b363SPhilipp Reisner } 3008b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3009b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3010b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3011e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3012e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3013e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3014b411b363SPhilipp Reisner else 3015e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3016e89b591cSPhilipp Reisner } else 3017b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3018b411b363SPhilipp Reisner } 3019b411b363SPhilipp Reisner } 3020b411b363SPhilipp Reisner 302181e84650SAndreas Gruenbacher return true; 3022b411b363SPhilipp Reisner } 3023b411b363SPhilipp Reisner 302402918be2SPhilipp Reisner static int receive_uuids(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3025b411b363SPhilipp Reisner { 302602918be2SPhilipp Reisner struct p_uuids *p = &mdev->data.rbuf.uuids; 3027b411b363SPhilipp Reisner u64 *p_uuid; 302862b0da3aSLars Ellenberg int i, updated_uuids = 0; 3029b411b363SPhilipp Reisner 3030b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3031b411b363SPhilipp Reisner 3032b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3033b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3034b411b363SPhilipp Reisner 3035b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3036b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3037b411b363SPhilipp Reisner 3038b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3039b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3040b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3041b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3042b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3043b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 3044b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 304581e84650SAndreas Gruenbacher return false; 3046b411b363SPhilipp Reisner } 3047b411b363SPhilipp Reisner 3048b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3049b411b363SPhilipp Reisner int skip_initial_sync = 3050b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 3051b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90 && 3052b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3053b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3054b411b363SPhilipp Reisner if (skip_initial_sync) { 3055b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3056b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 305720ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 305820ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3059b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3060b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3061b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3062b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3063b411b363SPhilipp Reisner drbd_md_sync(mdev); 306462b0da3aSLars Ellenberg updated_uuids = 1; 3065b411b363SPhilipp Reisner } 3066b411b363SPhilipp Reisner put_ldev(mdev); 306718a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 306818a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 306918a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 307018a50fa2SPhilipp Reisner for me. */ 307162b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3072b411b363SPhilipp Reisner } 3073b411b363SPhilipp Reisner 3074b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3075b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3076b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3077b411b363SPhilipp Reisner new disk state... */ 3078b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); 3079b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 308062b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 308162b0da3aSLars Ellenberg 308262b0da3aSLars Ellenberg if (updated_uuids) 308362b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3084b411b363SPhilipp Reisner 308581e84650SAndreas Gruenbacher return true; 3086b411b363SPhilipp Reisner } 3087b411b363SPhilipp Reisner 3088b411b363SPhilipp Reisner /** 3089b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3090b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3091b411b363SPhilipp Reisner */ 3092b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3093b411b363SPhilipp Reisner { 3094b411b363SPhilipp Reisner union drbd_state ms; 3095b411b363SPhilipp Reisner 3096b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3097b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3098b411b363SPhilipp Reisner 3099b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3100b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3101b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3102b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3103b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3104b411b363SPhilipp Reisner }; 3105b411b363SPhilipp Reisner 3106b411b363SPhilipp Reisner ms.i = ps.i; 3107b411b363SPhilipp Reisner 3108b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3109b411b363SPhilipp Reisner ms.peer = ps.role; 3110b411b363SPhilipp Reisner ms.role = ps.peer; 3111b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3112b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3113b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3114b411b363SPhilipp Reisner 3115b411b363SPhilipp Reisner return ms; 3116b411b363SPhilipp Reisner } 3117b411b363SPhilipp Reisner 311802918be2SPhilipp Reisner static int receive_req_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3119b411b363SPhilipp Reisner { 312002918be2SPhilipp Reisner struct p_req_state *p = &mdev->data.rbuf.req_state; 3121b411b363SPhilipp Reisner union drbd_state mask, val; 3122bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3123b411b363SPhilipp Reisner 3124b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3125b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3126b411b363SPhilipp Reisner 3127b411b363SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->flags) && 3128b411b363SPhilipp Reisner test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { 3129b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 313081e84650SAndreas Gruenbacher return true; 3131b411b363SPhilipp Reisner } 3132b411b363SPhilipp Reisner 3133b411b363SPhilipp Reisner mask = convert_state(mask); 3134b411b363SPhilipp Reisner val = convert_state(val); 3135b411b363SPhilipp Reisner 3136b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3137b411b363SPhilipp Reisner 3138b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3139b411b363SPhilipp Reisner drbd_md_sync(mdev); 3140b411b363SPhilipp Reisner 314181e84650SAndreas Gruenbacher return true; 3142b411b363SPhilipp Reisner } 3143b411b363SPhilipp Reisner 314402918be2SPhilipp Reisner static int receive_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3145b411b363SPhilipp Reisner { 314602918be2SPhilipp Reisner struct p_state *p = &mdev->data.rbuf.state; 31474ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3148b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 314965d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3150b411b363SPhilipp Reisner int rv; 3151b411b363SPhilipp Reisner 3152b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3153b411b363SPhilipp Reisner 3154b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3155b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3156b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3157b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3158b411b363SPhilipp Reisner } 3159b411b363SPhilipp Reisner 3160b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3161b411b363SPhilipp Reisner retry: 31624ac4aadaSLars Ellenberg os = ns = mdev->state; 3163b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3164b411b363SPhilipp Reisner 3165e9ef7bb6SLars Ellenberg /* peer says his disk is uptodate, while we think it is inconsistent, 3166e9ef7bb6SLars Ellenberg * and this happens while we think we have a sync going on. */ 3167e9ef7bb6SLars Ellenberg if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && 3168e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3169e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3170e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3171e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3172e9ef7bb6SLars Ellenberg * syncing states. 3173e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3174e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3175e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3176e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3177e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3178e9ef7bb6SLars Ellenberg 3179e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3180e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3181e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3182e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3183e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3184e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3185e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 318681e84650SAndreas Gruenbacher return true; 3187e9ef7bb6SLars Ellenberg } 3188e9ef7bb6SLars Ellenberg } 3189e9ef7bb6SLars Ellenberg 3190e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3191e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3192e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3193e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3194e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3195e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3196e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3197e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3198e9ef7bb6SLars Ellenberg 31994ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 32004ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3201b411b363SPhilipp Reisner 320267531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 320367531718SPhilipp Reisner ns.conn = C_BEHIND; 320467531718SPhilipp Reisner 3205b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3206b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3207b411b363SPhilipp Reisner int cr; /* consider resync */ 3208b411b363SPhilipp Reisner 3209b411b363SPhilipp Reisner /* if we established a new connection */ 32104ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3211b411b363SPhilipp Reisner /* if we had an established connection 3212b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 32134ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3214b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 32154ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3216b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3217b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3218b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3219b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3220b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 32214ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3222b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3223b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3224b411b363SPhilipp Reisner 3225b411b363SPhilipp Reisner if (cr) 32264ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3227b411b363SPhilipp Reisner 3228b411b363SPhilipp Reisner put_ldev(mdev); 32294ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 32304ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3231b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 323282f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3233b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3234b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3235b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3236580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3237b411b363SPhilipp Reisner } else { 3238cf14c2e9SPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) 323981e84650SAndreas Gruenbacher return false; 32404ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 3241b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 324281e84650SAndreas Gruenbacher return false; 3243b411b363SPhilipp Reisner } 3244b411b363SPhilipp Reisner } 3245b411b363SPhilipp Reisner } 3246b411b363SPhilipp Reisner 3247b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 32484ac4aadaSLars Ellenberg if (mdev->state.i != os.i) 3249b411b363SPhilipp Reisner goto retry; 3250b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3251b411b363SPhilipp Reisner ns.peer = peer_state.role; 3252b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3253b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 32544ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3255b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 32564ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 32574ac4aadaSLars Ellenberg if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3258481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 3259481c6f50SPhilipp Reisner /* Do not allow tl_restart(resend) for a rebooted peer. We can only allow this 3260481c6f50SPhilipp Reisner for temporal network outages! */ 3261481c6f50SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3262481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 3263481c6f50SPhilipp Reisner tl_clear(mdev); 3264481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3265481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 3266481c6f50SPhilipp Reisner drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0)); 326781e84650SAndreas Gruenbacher return false; 3268481c6f50SPhilipp Reisner } 326965d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 3270b411b363SPhilipp Reisner ns = mdev->state; 3271b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3272b411b363SPhilipp Reisner 3273b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 3274b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 327581e84650SAndreas Gruenbacher return false; 3276b411b363SPhilipp Reisner } 3277b411b363SPhilipp Reisner 32784ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 32794ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3280b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3281b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3282b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3283b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3284b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3285b411b363SPhilipp Reisner drbd_send_state(mdev); 3286b411b363SPhilipp Reisner } 3287b411b363SPhilipp Reisner } 3288b411b363SPhilipp Reisner 3289b411b363SPhilipp Reisner mdev->net_conf->want_lose = 0; 3290b411b363SPhilipp Reisner 3291b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3292b411b363SPhilipp Reisner 329381e84650SAndreas Gruenbacher return true; 3294b411b363SPhilipp Reisner } 3295b411b363SPhilipp Reisner 329602918be2SPhilipp Reisner static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3297b411b363SPhilipp Reisner { 329802918be2SPhilipp Reisner struct p_rs_uuid *p = &mdev->data.rbuf.rs_uuid; 3299b411b363SPhilipp Reisner 3300b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3301b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3302c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3303b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3304b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3305b411b363SPhilipp Reisner 3306b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3307b411b363SPhilipp Reisner 3308b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3309b411b363SPhilipp Reisner _not_ be rotated into the history */ 3310b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3311b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3312b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3313b411b363SPhilipp Reisner 331462b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3315b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3316b411b363SPhilipp Reisner 3317b411b363SPhilipp Reisner put_ldev(mdev); 3318b411b363SPhilipp Reisner } else 3319b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3320b411b363SPhilipp Reisner 332181e84650SAndreas Gruenbacher return true; 3322b411b363SPhilipp Reisner } 3323b411b363SPhilipp Reisner 33242c46407dSAndreas Gruenbacher /** 33252c46407dSAndreas Gruenbacher * receive_bitmap_plain 33262c46407dSAndreas Gruenbacher * 33272c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 33282c46407dSAndreas Gruenbacher * code upon failure. 33292c46407dSAndreas Gruenbacher */ 33302c46407dSAndreas Gruenbacher static int 333102918be2SPhilipp Reisner receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size, 3332b411b363SPhilipp Reisner unsigned long *buffer, struct bm_xfer_ctx *c) 3333b411b363SPhilipp Reisner { 3334b411b363SPhilipp Reisner unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); 3335b411b363SPhilipp Reisner unsigned want = num_words * sizeof(long); 33362c46407dSAndreas Gruenbacher int err; 3337b411b363SPhilipp Reisner 333802918be2SPhilipp Reisner if (want != data_size) { 333902918be2SPhilipp Reisner dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size); 33402c46407dSAndreas Gruenbacher return -EIO; 3341b411b363SPhilipp Reisner } 3342b411b363SPhilipp Reisner if (want == 0) 33432c46407dSAndreas Gruenbacher return 0; 33442c46407dSAndreas Gruenbacher err = drbd_recv(mdev, buffer, want); 33452c46407dSAndreas Gruenbacher if (err != want) { 33462c46407dSAndreas Gruenbacher if (err >= 0) 33472c46407dSAndreas Gruenbacher err = -EIO; 33482c46407dSAndreas Gruenbacher return err; 33492c46407dSAndreas Gruenbacher } 3350b411b363SPhilipp Reisner 3351b411b363SPhilipp Reisner drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); 3352b411b363SPhilipp Reisner 3353b411b363SPhilipp Reisner c->word_offset += num_words; 3354b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3355b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3356b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3357b411b363SPhilipp Reisner 33582c46407dSAndreas Gruenbacher return 1; 3359b411b363SPhilipp Reisner } 3360b411b363SPhilipp Reisner 33612c46407dSAndreas Gruenbacher /** 33622c46407dSAndreas Gruenbacher * recv_bm_rle_bits 33632c46407dSAndreas Gruenbacher * 33642c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 33652c46407dSAndreas Gruenbacher * code upon failure. 33662c46407dSAndreas Gruenbacher */ 33672c46407dSAndreas Gruenbacher static int 3368b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3369b411b363SPhilipp Reisner struct p_compressed_bm *p, 3370b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3371b411b363SPhilipp Reisner { 3372b411b363SPhilipp Reisner struct bitstream bs; 3373b411b363SPhilipp Reisner u64 look_ahead; 3374b411b363SPhilipp Reisner u64 rl; 3375b411b363SPhilipp Reisner u64 tmp; 3376b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3377b411b363SPhilipp Reisner unsigned long e; 3378004352faSLars Ellenberg int len = be16_to_cpu(p->head.length) - (sizeof(*p) - sizeof(p->head)); 3379b411b363SPhilipp Reisner int toggle = DCBP_get_start(p); 3380b411b363SPhilipp Reisner int have; 3381b411b363SPhilipp Reisner int bits; 3382b411b363SPhilipp Reisner 3383b411b363SPhilipp Reisner bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); 3384b411b363SPhilipp Reisner 3385b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3386b411b363SPhilipp Reisner if (bits < 0) 33872c46407dSAndreas Gruenbacher return -EIO; 3388b411b363SPhilipp Reisner 3389b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3390b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3391b411b363SPhilipp Reisner if (bits <= 0) 33922c46407dSAndreas Gruenbacher return -EIO; 3393b411b363SPhilipp Reisner 3394b411b363SPhilipp Reisner if (toggle) { 3395b411b363SPhilipp Reisner e = s + rl -1; 3396b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3397b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 33982c46407dSAndreas Gruenbacher return -EIO; 3399b411b363SPhilipp Reisner } 3400b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3401b411b363SPhilipp Reisner } 3402b411b363SPhilipp Reisner 3403b411b363SPhilipp Reisner if (have < bits) { 3404b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3405b411b363SPhilipp Reisner have, bits, look_ahead, 3406b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3407b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 34082c46407dSAndreas Gruenbacher return -EIO; 3409b411b363SPhilipp Reisner } 3410b411b363SPhilipp Reisner look_ahead >>= bits; 3411b411b363SPhilipp Reisner have -= bits; 3412b411b363SPhilipp Reisner 3413b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3414b411b363SPhilipp Reisner if (bits < 0) 34152c46407dSAndreas Gruenbacher return -EIO; 3416b411b363SPhilipp Reisner look_ahead |= tmp << have; 3417b411b363SPhilipp Reisner have += bits; 3418b411b363SPhilipp Reisner } 3419b411b363SPhilipp Reisner 3420b411b363SPhilipp Reisner c->bit_offset = s; 3421b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3422b411b363SPhilipp Reisner 34232c46407dSAndreas Gruenbacher return (s != c->bm_bits); 3424b411b363SPhilipp Reisner } 3425b411b363SPhilipp Reisner 34262c46407dSAndreas Gruenbacher /** 34272c46407dSAndreas Gruenbacher * decode_bitmap_c 34282c46407dSAndreas Gruenbacher * 34292c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 34302c46407dSAndreas Gruenbacher * code upon failure. 34312c46407dSAndreas Gruenbacher */ 34322c46407dSAndreas Gruenbacher static int 3433b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3434b411b363SPhilipp Reisner struct p_compressed_bm *p, 3435b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3436b411b363SPhilipp Reisner { 3437b411b363SPhilipp Reisner if (DCBP_get_code(p) == RLE_VLI_Bits) 3438b411b363SPhilipp Reisner return recv_bm_rle_bits(mdev, p, c); 3439b411b363SPhilipp Reisner 3440b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3441b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3442b411b363SPhilipp Reisner * during all our tests. */ 3443b411b363SPhilipp Reisner 3444b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 3445b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 34462c46407dSAndreas Gruenbacher return -EIO; 3447b411b363SPhilipp Reisner } 3448b411b363SPhilipp Reisner 3449b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3450b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3451b411b363SPhilipp Reisner { 3452b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 34530b70a13dSPhilipp Reisner unsigned plain = sizeof(struct p_header80) * 3454b411b363SPhilipp Reisner ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) 3455b411b363SPhilipp Reisner + c->bm_words * sizeof(long); 3456b411b363SPhilipp Reisner unsigned total = c->bytes[0] + c->bytes[1]; 3457b411b363SPhilipp Reisner unsigned r; 3458b411b363SPhilipp Reisner 3459b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3460b411b363SPhilipp Reisner if (total == 0) 3461b411b363SPhilipp Reisner return; 3462b411b363SPhilipp Reisner 3463b411b363SPhilipp Reisner /* don't report if not compressed */ 3464b411b363SPhilipp Reisner if (total >= plain) 3465b411b363SPhilipp Reisner return; 3466b411b363SPhilipp Reisner 3467b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3468b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3469b411b363SPhilipp Reisner : (1000 * total / plain); 3470b411b363SPhilipp Reisner 3471b411b363SPhilipp Reisner if (r > 1000) 3472b411b363SPhilipp Reisner r = 1000; 3473b411b363SPhilipp Reisner 3474b411b363SPhilipp Reisner r = 1000 - r; 3475b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3476b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3477b411b363SPhilipp Reisner direction, 3478b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3479b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3480b411b363SPhilipp Reisner total, r/10, r % 10); 3481b411b363SPhilipp Reisner } 3482b411b363SPhilipp Reisner 3483b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3484b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3485b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3486b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3487b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3488b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3489b411b363SPhilipp Reisner 3490b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 349102918be2SPhilipp Reisner static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3492b411b363SPhilipp Reisner { 3493b411b363SPhilipp Reisner struct bm_xfer_ctx c; 3494b411b363SPhilipp Reisner void *buffer; 34952c46407dSAndreas Gruenbacher int err; 349681e84650SAndreas Gruenbacher int ok = false; 349702918be2SPhilipp Reisner struct p_header80 *h = &mdev->data.rbuf.header.h80; 3498b411b363SPhilipp Reisner 349920ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 350020ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 350120ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 3502b411b363SPhilipp Reisner 3503b411b363SPhilipp Reisner /* maybe we should use some per thread scratch page, 3504b411b363SPhilipp Reisner * and allocate that during initial device creation? */ 3505b411b363SPhilipp Reisner buffer = (unsigned long *) __get_free_page(GFP_NOIO); 3506b411b363SPhilipp Reisner if (!buffer) { 3507b411b363SPhilipp Reisner dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); 3508b411b363SPhilipp Reisner goto out; 3509b411b363SPhilipp Reisner } 3510b411b363SPhilipp Reisner 3511b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3512b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3513b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3514b411b363SPhilipp Reisner }; 3515b411b363SPhilipp Reisner 35162c46407dSAndreas Gruenbacher for(;;) { 351702918be2SPhilipp Reisner if (cmd == P_BITMAP) { 35182c46407dSAndreas Gruenbacher err = receive_bitmap_plain(mdev, data_size, buffer, &c); 351902918be2SPhilipp Reisner } else if (cmd == P_COMPRESSED_BITMAP) { 3520b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3521b411b363SPhilipp Reisner * and the feature is enabled! */ 3522b411b363SPhilipp Reisner struct p_compressed_bm *p; 3523b411b363SPhilipp Reisner 352402918be2SPhilipp Reisner if (data_size > BM_PACKET_PAYLOAD_BYTES) { 3525b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 3526b411b363SPhilipp Reisner goto out; 3527b411b363SPhilipp Reisner } 3528b411b363SPhilipp Reisner /* use the page buff */ 3529b411b363SPhilipp Reisner p = buffer; 3530b411b363SPhilipp Reisner memcpy(p, h, sizeof(*h)); 353102918be2SPhilipp Reisner if (drbd_recv(mdev, p->head.payload, data_size) != data_size) 3532b411b363SPhilipp Reisner goto out; 3533004352faSLars Ellenberg if (data_size <= (sizeof(*p) - sizeof(p->head))) { 3534004352faSLars Ellenberg dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size); 353578fcbdaeSAndreas Gruenbacher goto out; 3536b411b363SPhilipp Reisner } 35372c46407dSAndreas Gruenbacher err = decode_bitmap_c(mdev, p, &c); 3538b411b363SPhilipp Reisner } else { 353902918be2SPhilipp Reisner dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd); 3540b411b363SPhilipp Reisner goto out; 3541b411b363SPhilipp Reisner } 3542b411b363SPhilipp Reisner 354302918be2SPhilipp Reisner c.packets[cmd == P_BITMAP]++; 354402918be2SPhilipp Reisner c.bytes[cmd == P_BITMAP] += sizeof(struct p_header80) + data_size; 3545b411b363SPhilipp Reisner 35462c46407dSAndreas Gruenbacher if (err <= 0) { 35472c46407dSAndreas Gruenbacher if (err < 0) 35482c46407dSAndreas Gruenbacher goto out; 3549b411b363SPhilipp Reisner break; 35502c46407dSAndreas Gruenbacher } 355102918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &data_size)) 3552b411b363SPhilipp Reisner goto out; 35532c46407dSAndreas Gruenbacher } 3554b411b363SPhilipp Reisner 3555b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 3556b411b363SPhilipp Reisner 3557b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 3558de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 3559de1f8e4aSAndreas Gruenbacher 3560b411b363SPhilipp Reisner ok = !drbd_send_bitmap(mdev); 3561b411b363SPhilipp Reisner if (!ok) 3562b411b363SPhilipp Reisner goto out; 3563b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 3564de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 3565de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 3566b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 3567b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 3568b411b363SPhilipp Reisner * other threads may have noticed network errors */ 3569b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 3570b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3571b411b363SPhilipp Reisner } 3572b411b363SPhilipp Reisner 357381e84650SAndreas Gruenbacher ok = true; 3574b411b363SPhilipp Reisner out: 357520ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 3576b411b363SPhilipp Reisner if (ok && mdev->state.conn == C_WF_BITMAP_S) 3577b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 3578b411b363SPhilipp Reisner free_page((unsigned long) buffer); 3579b411b363SPhilipp Reisner return ok; 3580b411b363SPhilipp Reisner } 3581b411b363SPhilipp Reisner 358202918be2SPhilipp Reisner static int receive_skip(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3583b411b363SPhilipp Reisner { 3584b411b363SPhilipp Reisner /* TODO zero copy sink :) */ 3585b411b363SPhilipp Reisner static char sink[128]; 3586b411b363SPhilipp Reisner int size, want, r; 3587b411b363SPhilipp Reisner 3588b411b363SPhilipp Reisner dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", 358902918be2SPhilipp Reisner cmd, data_size); 3590b411b363SPhilipp Reisner 359102918be2SPhilipp Reisner size = data_size; 3592b411b363SPhilipp Reisner while (size > 0) { 3593b411b363SPhilipp Reisner want = min_t(int, size, sizeof(sink)); 3594b411b363SPhilipp Reisner r = drbd_recv(mdev, sink, want); 3595b411b363SPhilipp Reisner ERR_IF(r <= 0) break; 3596b411b363SPhilipp Reisner size -= r; 3597b411b363SPhilipp Reisner } 3598b411b363SPhilipp Reisner return size == 0; 3599b411b363SPhilipp Reisner } 3600b411b363SPhilipp Reisner 360102918be2SPhilipp Reisner static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3602b411b363SPhilipp Reisner { 3603b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 3604b411b363SPhilipp Reisner * with the data requests being unplugged */ 3605b411b363SPhilipp Reisner drbd_tcp_quickack(mdev->data.socket); 3606b411b363SPhilipp Reisner 360781e84650SAndreas Gruenbacher return true; 3608b411b363SPhilipp Reisner } 3609b411b363SPhilipp Reisner 361073a01a18SPhilipp Reisner static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 361173a01a18SPhilipp Reisner { 361273a01a18SPhilipp Reisner struct p_block_desc *p = &mdev->data.rbuf.block_desc; 361373a01a18SPhilipp Reisner 3614f735e363SLars Ellenberg switch (mdev->state.conn) { 3615f735e363SLars Ellenberg case C_WF_SYNC_UUID: 3616f735e363SLars Ellenberg case C_WF_BITMAP_T: 3617f735e363SLars Ellenberg case C_BEHIND: 3618f735e363SLars Ellenberg break; 3619f735e363SLars Ellenberg default: 3620f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 3621f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 3622f735e363SLars Ellenberg } 3623f735e363SLars Ellenberg 362473a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 362573a01a18SPhilipp Reisner 362681e84650SAndreas Gruenbacher return true; 362773a01a18SPhilipp Reisner } 362873a01a18SPhilipp Reisner 362902918be2SPhilipp Reisner typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, enum drbd_packets cmd, unsigned int to_receive); 3630b411b363SPhilipp Reisner 363102918be2SPhilipp Reisner struct data_cmd { 363202918be2SPhilipp Reisner int expect_payload; 363302918be2SPhilipp Reisner size_t pkt_size; 363402918be2SPhilipp Reisner drbd_cmd_handler_f function; 3635b411b363SPhilipp Reisner }; 3636b411b363SPhilipp Reisner 363702918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 363802918be2SPhilipp Reisner [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 363902918be2SPhilipp Reisner [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 364002918be2SPhilipp Reisner [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 364102918be2SPhilipp Reisner [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 364202918be2SPhilipp Reisner [P_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } , 364302918be2SPhilipp Reisner [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } , 364402918be2SPhilipp Reisner [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header80), receive_UnplugRemote }, 364502918be2SPhilipp Reisner [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 364602918be2SPhilipp Reisner [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 364702918be2SPhilipp Reisner [P_SYNC_PARAM] = { 1, sizeof(struct p_header80), receive_SyncParam }, 364802918be2SPhilipp Reisner [P_SYNC_PARAM89] = { 1, sizeof(struct p_header80), receive_SyncParam }, 364902918be2SPhilipp Reisner [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 365002918be2SPhilipp Reisner [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 365102918be2SPhilipp Reisner [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 365202918be2SPhilipp Reisner [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 365302918be2SPhilipp Reisner [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 365402918be2SPhilipp Reisner [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 365502918be2SPhilipp Reisner [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 365602918be2SPhilipp Reisner [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 365702918be2SPhilipp Reisner [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 365802918be2SPhilipp Reisner [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 365973a01a18SPhilipp Reisner [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 366002918be2SPhilipp Reisner /* anything missing from this table is in 366102918be2SPhilipp Reisner * the asender_tbl, see get_asender_cmd */ 366202918be2SPhilipp Reisner [P_MAX_CMD] = { 0, 0, NULL }, 366302918be2SPhilipp Reisner }; 366402918be2SPhilipp Reisner 366502918be2SPhilipp Reisner /* All handler functions that expect a sub-header get that sub-heder in 366602918be2SPhilipp Reisner mdev->data.rbuf.header.head.payload. 366702918be2SPhilipp Reisner 366802918be2SPhilipp Reisner Usually in mdev->data.rbuf.header.head the callback can find the usual 366902918be2SPhilipp Reisner p_header, but they may not rely on that. Since there is also p_header95 ! 367002918be2SPhilipp Reisner */ 3671b411b363SPhilipp Reisner 3672b411b363SPhilipp Reisner static void drbdd(struct drbd_conf *mdev) 3673b411b363SPhilipp Reisner { 367402918be2SPhilipp Reisner union p_header *header = &mdev->data.rbuf.header; 367502918be2SPhilipp Reisner unsigned int packet_size; 367602918be2SPhilipp Reisner enum drbd_packets cmd; 367702918be2SPhilipp Reisner size_t shs; /* sub header size */ 367802918be2SPhilipp Reisner int rv; 3679b411b363SPhilipp Reisner 3680b411b363SPhilipp Reisner while (get_t_state(&mdev->receiver) == Running) { 3681b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 368202918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &packet_size)) 368302918be2SPhilipp Reisner goto err_out; 368402918be2SPhilipp Reisner 368502918be2SPhilipp Reisner if (unlikely(cmd >= P_MAX_CMD || !drbd_cmd_handler[cmd].function)) { 368602918be2SPhilipp Reisner dev_err(DEV, "unknown packet type %d, l: %d!\n", cmd, packet_size); 368702918be2SPhilipp Reisner goto err_out; 36880b33a916SLars Ellenberg } 3689b411b363SPhilipp Reisner 369002918be2SPhilipp Reisner shs = drbd_cmd_handler[cmd].pkt_size - sizeof(union p_header); 3691c13f7e1aSLars Ellenberg if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) { 3692c13f7e1aSLars Ellenberg dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size); 3693c13f7e1aSLars Ellenberg goto err_out; 3694c13f7e1aSLars Ellenberg } 3695c13f7e1aSLars Ellenberg 3696c13f7e1aSLars Ellenberg if (shs) { 369702918be2SPhilipp Reisner rv = drbd_recv(mdev, &header->h80.payload, shs); 369802918be2SPhilipp Reisner if (unlikely(rv != shs)) { 369902918be2SPhilipp Reisner dev_err(DEV, "short read while reading sub header: rv=%d\n", rv); 370002918be2SPhilipp Reisner goto err_out; 3701b411b363SPhilipp Reisner } 370202918be2SPhilipp Reisner } 370302918be2SPhilipp Reisner 370402918be2SPhilipp Reisner rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs); 370502918be2SPhilipp Reisner 370602918be2SPhilipp Reisner if (unlikely(!rv)) { 3707b411b363SPhilipp Reisner dev_err(DEV, "error receiving %s, l: %d!\n", 370802918be2SPhilipp Reisner cmdname(cmd), packet_size); 370902918be2SPhilipp Reisner goto err_out; 3710b411b363SPhilipp Reisner } 3711b411b363SPhilipp Reisner } 371202918be2SPhilipp Reisner 371302918be2SPhilipp Reisner if (0) { 371402918be2SPhilipp Reisner err_out: 3715b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3716b411b363SPhilipp Reisner } 3717856c50c7SLars Ellenberg /* If we leave here, we probably want to update at least the 3718856c50c7SLars Ellenberg * "Connected" indicator on stable storage. Do so explicitly here. */ 3719856c50c7SLars Ellenberg drbd_md_sync(mdev); 3720b411b363SPhilipp Reisner } 3721b411b363SPhilipp Reisner 3722b411b363SPhilipp Reisner void drbd_flush_workqueue(struct drbd_conf *mdev) 3723b411b363SPhilipp Reisner { 3724b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 3725b411b363SPhilipp Reisner 3726b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 3727b411b363SPhilipp Reisner init_completion(&barr.done); 3728b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, &barr.w); 3729b411b363SPhilipp Reisner wait_for_completion(&barr.done); 3730b411b363SPhilipp Reisner } 3731b411b363SPhilipp Reisner 3732f70b3511SPhilipp Reisner void drbd_free_tl_hash(struct drbd_conf *mdev) 3733f70b3511SPhilipp Reisner { 3734f70b3511SPhilipp Reisner struct hlist_head *h; 3735f70b3511SPhilipp Reisner 3736f70b3511SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3737f70b3511SPhilipp Reisner 3738f70b3511SPhilipp Reisner if (!mdev->tl_hash || mdev->state.conn != C_STANDALONE) { 3739f70b3511SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3740f70b3511SPhilipp Reisner return; 3741f70b3511SPhilipp Reisner } 3742f70b3511SPhilipp Reisner /* paranoia code */ 3743f70b3511SPhilipp Reisner for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++) 3744f70b3511SPhilipp Reisner if (h->first) 3745f70b3511SPhilipp Reisner dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n", 3746f70b3511SPhilipp Reisner (int)(h - mdev->ee_hash), h->first); 3747f70b3511SPhilipp Reisner kfree(mdev->ee_hash); 3748f70b3511SPhilipp Reisner mdev->ee_hash = NULL; 3749f70b3511SPhilipp Reisner mdev->ee_hash_s = 0; 3750f70b3511SPhilipp Reisner 3751f70b3511SPhilipp Reisner /* paranoia code */ 3752f70b3511SPhilipp Reisner for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++) 3753f70b3511SPhilipp Reisner if (h->first) 3754f70b3511SPhilipp Reisner dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n", 3755f70b3511SPhilipp Reisner (int)(h - mdev->tl_hash), h->first); 3756f70b3511SPhilipp Reisner kfree(mdev->tl_hash); 3757f70b3511SPhilipp Reisner mdev->tl_hash = NULL; 3758f70b3511SPhilipp Reisner mdev->tl_hash_s = 0; 3759f70b3511SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3760f70b3511SPhilipp Reisner } 3761f70b3511SPhilipp Reisner 3762b411b363SPhilipp Reisner static void drbd_disconnect(struct drbd_conf *mdev) 3763b411b363SPhilipp Reisner { 3764b411b363SPhilipp Reisner enum drbd_fencing_p fp; 3765b411b363SPhilipp Reisner union drbd_state os, ns; 3766b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 3767b411b363SPhilipp Reisner unsigned int i; 3768b411b363SPhilipp Reisner 3769b411b363SPhilipp Reisner if (mdev->state.conn == C_STANDALONE) 3770b411b363SPhilipp Reisner return; 3771b411b363SPhilipp Reisner 3772b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 3773b411b363SPhilipp Reisner drbd_thread_stop(&mdev->asender); 3774b411b363SPhilipp Reisner drbd_free_sock(mdev); 3775b411b363SPhilipp Reisner 377685719573SPhilipp Reisner /* wait for current activity to cease. */ 3777b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3778b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 3779b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 3780b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 3781b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3782b411b363SPhilipp Reisner 3783b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 3784b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 3785b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 3786b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 3787b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 3788b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 3789b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 3790b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 3791b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 3792b411b363SPhilipp Reisner * on the fly. */ 3793b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 3794b411b363SPhilipp Reisner mdev->rs_total = 0; 3795b411b363SPhilipp Reisner mdev->rs_failed = 0; 3796b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 3797b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 3798b411b363SPhilipp Reisner 3799b411b363SPhilipp Reisner /* make sure syncer is stopped and w_resume_next_sg queued */ 3800b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 3801b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 3802b411b363SPhilipp Reisner 3803b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 3804b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 3805b411b363SPhilipp Reisner * to be "canceled" */ 3806b411b363SPhilipp Reisner drbd_flush_workqueue(mdev); 3807b411b363SPhilipp Reisner 3808b411b363SPhilipp Reisner /* This also does reclaim_net_ee(). If we do this too early, we might 3809b411b363SPhilipp Reisner * miss some resync ee and pages.*/ 3810b411b363SPhilipp Reisner drbd_process_done_ee(mdev); 3811b411b363SPhilipp Reisner 3812b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3813b411b363SPhilipp Reisner mdev->p_uuid = NULL; 3814b411b363SPhilipp Reisner 3815fb22c402SPhilipp Reisner if (!is_susp(mdev->state)) 3816b411b363SPhilipp Reisner tl_clear(mdev); 3817b411b363SPhilipp Reisner 3818b411b363SPhilipp Reisner dev_info(DEV, "Connection closed\n"); 3819b411b363SPhilipp Reisner 3820b411b363SPhilipp Reisner drbd_md_sync(mdev); 3821b411b363SPhilipp Reisner 3822b411b363SPhilipp Reisner fp = FP_DONT_CARE; 3823b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3824b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 3825b411b363SPhilipp Reisner put_ldev(mdev); 3826b411b363SPhilipp Reisner } 3827b411b363SPhilipp Reisner 382887f7be4cSPhilipp Reisner if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) 382987f7be4cSPhilipp Reisner drbd_try_outdate_peer_async(mdev); 3830b411b363SPhilipp Reisner 3831b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3832b411b363SPhilipp Reisner os = mdev->state; 3833b411b363SPhilipp Reisner if (os.conn >= C_UNCONNECTED) { 3834b411b363SPhilipp Reisner /* Do not restart in case we are C_DISCONNECTING */ 3835b411b363SPhilipp Reisner ns = os; 3836b411b363SPhilipp Reisner ns.conn = C_UNCONNECTED; 3837b411b363SPhilipp Reisner rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 3838b411b363SPhilipp Reisner } 3839b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3840b411b363SPhilipp Reisner 3841b411b363SPhilipp Reisner if (os.conn == C_DISCONNECTING) { 384284dfb9f5SPhilipp Reisner wait_event(mdev->net_cnt_wait, atomic_read(&mdev->net_cnt) == 0); 3843b411b363SPhilipp Reisner 3844b411b363SPhilipp Reisner crypto_free_hash(mdev->cram_hmac_tfm); 3845b411b363SPhilipp Reisner mdev->cram_hmac_tfm = NULL; 3846b411b363SPhilipp Reisner 3847b411b363SPhilipp Reisner kfree(mdev->net_conf); 3848b411b363SPhilipp Reisner mdev->net_conf = NULL; 3849b411b363SPhilipp Reisner drbd_request_state(mdev, NS(conn, C_STANDALONE)); 3850b411b363SPhilipp Reisner } 3851b411b363SPhilipp Reisner 385220ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 385320ceb2b2SLars Ellenberg * if any. */ 385420ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 385520ceb2b2SLars Ellenberg 3856b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 3857b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 3858b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 3859b411b363SPhilipp Reisner * 3860b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 3861b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 3862b411b363SPhilipp Reisner */ 3863b411b363SPhilipp Reisner i = drbd_release_ee(mdev, &mdev->net_ee); 3864b411b363SPhilipp Reisner if (i) 3865b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 3866435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 3867435f0740SLars Ellenberg if (i) 3868435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 3869b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 3870b411b363SPhilipp Reisner if (i) 387145bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 3872b411b363SPhilipp Reisner 3873b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 3874b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 3875b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 3876b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 3877b411b363SPhilipp Reisner 3878b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 3879b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 3880b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 3881b411b363SPhilipp Reisner } 3882b411b363SPhilipp Reisner 3883b411b363SPhilipp Reisner /* 3884b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 3885b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 3886b411b363SPhilipp Reisner * 3887b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 3888b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 3889b411b363SPhilipp Reisner * 3890b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 3891b411b363SPhilipp Reisner */ 3892b411b363SPhilipp Reisner static int drbd_send_handshake(struct drbd_conf *mdev) 3893b411b363SPhilipp Reisner { 3894b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3895b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.sbuf.handshake; 3896b411b363SPhilipp Reisner int ok; 3897b411b363SPhilipp Reisner 3898b411b363SPhilipp Reisner if (mutex_lock_interruptible(&mdev->data.mutex)) { 3899b411b363SPhilipp Reisner dev_err(DEV, "interrupted during initial handshake\n"); 3900b411b363SPhilipp Reisner return 0; /* interrupted. not ok. */ 3901b411b363SPhilipp Reisner } 3902b411b363SPhilipp Reisner 3903b411b363SPhilipp Reisner if (mdev->data.socket == NULL) { 3904b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3905b411b363SPhilipp Reisner return 0; 3906b411b363SPhilipp Reisner } 3907b411b363SPhilipp Reisner 3908b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 3909b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 3910b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 3911b411b363SPhilipp Reisner ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE, 39120b70a13dSPhilipp Reisner (struct p_header80 *)p, sizeof(*p), 0 ); 3913b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3914b411b363SPhilipp Reisner return ok; 3915b411b363SPhilipp Reisner } 3916b411b363SPhilipp Reisner 3917b411b363SPhilipp Reisner /* 3918b411b363SPhilipp Reisner * return values: 3919b411b363SPhilipp Reisner * 1 yes, we have a valid connection 3920b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 3921b411b363SPhilipp Reisner * -1 peer talks different language, 3922b411b363SPhilipp Reisner * no point in trying again, please go standalone. 3923b411b363SPhilipp Reisner */ 3924b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev) 3925b411b363SPhilipp Reisner { 3926b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3927b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.rbuf.handshake; 392802918be2SPhilipp Reisner const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80); 392902918be2SPhilipp Reisner unsigned int length; 393002918be2SPhilipp Reisner enum drbd_packets cmd; 3931b411b363SPhilipp Reisner int rv; 3932b411b363SPhilipp Reisner 3933b411b363SPhilipp Reisner rv = drbd_send_handshake(mdev); 3934b411b363SPhilipp Reisner if (!rv) 3935b411b363SPhilipp Reisner return 0; 3936b411b363SPhilipp Reisner 393702918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 3938b411b363SPhilipp Reisner if (!rv) 3939b411b363SPhilipp Reisner return 0; 3940b411b363SPhilipp Reisner 394102918be2SPhilipp Reisner if (cmd != P_HAND_SHAKE) { 3942b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", 394302918be2SPhilipp Reisner cmdname(cmd), cmd); 3944b411b363SPhilipp Reisner return -1; 3945b411b363SPhilipp Reisner } 3946b411b363SPhilipp Reisner 394702918be2SPhilipp Reisner if (length != expect) { 3948b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake length: %u, received: %u\n", 394902918be2SPhilipp Reisner expect, length); 3950b411b363SPhilipp Reisner return -1; 3951b411b363SPhilipp Reisner } 3952b411b363SPhilipp Reisner 3953b411b363SPhilipp Reisner rv = drbd_recv(mdev, &p->head.payload, expect); 3954b411b363SPhilipp Reisner 3955b411b363SPhilipp Reisner if (rv != expect) { 3956b411b363SPhilipp Reisner dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv); 3957b411b363SPhilipp Reisner return 0; 3958b411b363SPhilipp Reisner } 3959b411b363SPhilipp Reisner 3960b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 3961b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 3962b411b363SPhilipp Reisner if (p->protocol_max == 0) 3963b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 3964b411b363SPhilipp Reisner 3965b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 3966b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 3967b411b363SPhilipp Reisner goto incompat; 3968b411b363SPhilipp Reisner 3969b411b363SPhilipp Reisner mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 3970b411b363SPhilipp Reisner 3971b411b363SPhilipp Reisner dev_info(DEV, "Handshake successful: " 3972b411b363SPhilipp Reisner "Agreed network protocol version %d\n", mdev->agreed_pro_version); 3973b411b363SPhilipp Reisner 3974b411b363SPhilipp Reisner return 1; 3975b411b363SPhilipp Reisner 3976b411b363SPhilipp Reisner incompat: 3977b411b363SPhilipp Reisner dev_err(DEV, "incompatible DRBD dialects: " 3978b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 3979b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 3980b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 3981b411b363SPhilipp Reisner return -1; 3982b411b363SPhilipp Reisner } 3983b411b363SPhilipp Reisner 3984b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 3985b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 3986b411b363SPhilipp Reisner { 3987b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 3988b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 3989b10d96cbSJohannes Thoma return -1; 3990b411b363SPhilipp Reisner } 3991b411b363SPhilipp Reisner #else 3992b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 3993b10d96cbSJohannes Thoma 3994b10d96cbSJohannes Thoma /* Return value: 3995b10d96cbSJohannes Thoma 1 - auth succeeded, 3996b10d96cbSJohannes Thoma 0 - failed, try again (network error), 3997b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 3998b10d96cbSJohannes Thoma */ 3999b10d96cbSJohannes Thoma 4000b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 4001b411b363SPhilipp Reisner { 4002b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4003b411b363SPhilipp Reisner struct scatterlist sg; 4004b411b363SPhilipp Reisner char *response = NULL; 4005b411b363SPhilipp Reisner char *right_response = NULL; 4006b411b363SPhilipp Reisner char *peers_ch = NULL; 4007b411b363SPhilipp Reisner unsigned int key_len = strlen(mdev->net_conf->shared_secret); 4008b411b363SPhilipp Reisner unsigned int resp_size; 4009b411b363SPhilipp Reisner struct hash_desc desc; 401002918be2SPhilipp Reisner enum drbd_packets cmd; 401102918be2SPhilipp Reisner unsigned int length; 4012b411b363SPhilipp Reisner int rv; 4013b411b363SPhilipp Reisner 4014b411b363SPhilipp Reisner desc.tfm = mdev->cram_hmac_tfm; 4015b411b363SPhilipp Reisner desc.flags = 0; 4016b411b363SPhilipp Reisner 4017b411b363SPhilipp Reisner rv = crypto_hash_setkey(mdev->cram_hmac_tfm, 4018b411b363SPhilipp Reisner (u8 *)mdev->net_conf->shared_secret, key_len); 4019b411b363SPhilipp Reisner if (rv) { 4020b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); 4021b10d96cbSJohannes Thoma rv = -1; 4022b411b363SPhilipp Reisner goto fail; 4023b411b363SPhilipp Reisner } 4024b411b363SPhilipp Reisner 4025b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4026b411b363SPhilipp Reisner 4027b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); 4028b411b363SPhilipp Reisner if (!rv) 4029b411b363SPhilipp Reisner goto fail; 4030b411b363SPhilipp Reisner 403102918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4032b411b363SPhilipp Reisner if (!rv) 4033b411b363SPhilipp Reisner goto fail; 4034b411b363SPhilipp Reisner 403502918be2SPhilipp Reisner if (cmd != P_AUTH_CHALLENGE) { 4036b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", 403702918be2SPhilipp Reisner cmdname(cmd), cmd); 4038b411b363SPhilipp Reisner rv = 0; 4039b411b363SPhilipp Reisner goto fail; 4040b411b363SPhilipp Reisner } 4041b411b363SPhilipp Reisner 404202918be2SPhilipp Reisner if (length > CHALLENGE_LEN * 2) { 4043b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge payload too big.\n"); 4044b10d96cbSJohannes Thoma rv = -1; 4045b411b363SPhilipp Reisner goto fail; 4046b411b363SPhilipp Reisner } 4047b411b363SPhilipp Reisner 404802918be2SPhilipp Reisner peers_ch = kmalloc(length, GFP_NOIO); 4049b411b363SPhilipp Reisner if (peers_ch == NULL) { 4050b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of peers_ch failed\n"); 4051b10d96cbSJohannes Thoma rv = -1; 4052b411b363SPhilipp Reisner goto fail; 4053b411b363SPhilipp Reisner } 4054b411b363SPhilipp Reisner 405502918be2SPhilipp Reisner rv = drbd_recv(mdev, peers_ch, length); 4056b411b363SPhilipp Reisner 405702918be2SPhilipp Reisner if (rv != length) { 4058b411b363SPhilipp Reisner dev_err(DEV, "short read AuthChallenge: l=%u\n", rv); 4059b411b363SPhilipp Reisner rv = 0; 4060b411b363SPhilipp Reisner goto fail; 4061b411b363SPhilipp Reisner } 4062b411b363SPhilipp Reisner 4063b411b363SPhilipp Reisner resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm); 4064b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4065b411b363SPhilipp Reisner if (response == NULL) { 4066b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of response failed\n"); 4067b10d96cbSJohannes Thoma rv = -1; 4068b411b363SPhilipp Reisner goto fail; 4069b411b363SPhilipp Reisner } 4070b411b363SPhilipp Reisner 4071b411b363SPhilipp Reisner sg_init_table(&sg, 1); 407202918be2SPhilipp Reisner sg_set_buf(&sg, peers_ch, length); 4073b411b363SPhilipp Reisner 4074b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4075b411b363SPhilipp Reisner if (rv) { 4076b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4077b10d96cbSJohannes Thoma rv = -1; 4078b411b363SPhilipp Reisner goto fail; 4079b411b363SPhilipp Reisner } 4080b411b363SPhilipp Reisner 4081b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); 4082b411b363SPhilipp Reisner if (!rv) 4083b411b363SPhilipp Reisner goto fail; 4084b411b363SPhilipp Reisner 408502918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4086b411b363SPhilipp Reisner if (!rv) 4087b411b363SPhilipp Reisner goto fail; 4088b411b363SPhilipp Reisner 408902918be2SPhilipp Reisner if (cmd != P_AUTH_RESPONSE) { 4090b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", 409102918be2SPhilipp Reisner cmdname(cmd), cmd); 4092b411b363SPhilipp Reisner rv = 0; 4093b411b363SPhilipp Reisner goto fail; 4094b411b363SPhilipp Reisner } 4095b411b363SPhilipp Reisner 409602918be2SPhilipp Reisner if (length != resp_size) { 4097b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse payload of wrong size\n"); 4098b411b363SPhilipp Reisner rv = 0; 4099b411b363SPhilipp Reisner goto fail; 4100b411b363SPhilipp Reisner } 4101b411b363SPhilipp Reisner 4102b411b363SPhilipp Reisner rv = drbd_recv(mdev, response , resp_size); 4103b411b363SPhilipp Reisner 4104b411b363SPhilipp Reisner if (rv != resp_size) { 4105b411b363SPhilipp Reisner dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv); 4106b411b363SPhilipp Reisner rv = 0; 4107b411b363SPhilipp Reisner goto fail; 4108b411b363SPhilipp Reisner } 4109b411b363SPhilipp Reisner 4110b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 41112d1ee87dSJulia Lawall if (right_response == NULL) { 4112b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of right_response failed\n"); 4113b10d96cbSJohannes Thoma rv = -1; 4114b411b363SPhilipp Reisner goto fail; 4115b411b363SPhilipp Reisner } 4116b411b363SPhilipp Reisner 4117b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4118b411b363SPhilipp Reisner 4119b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4120b411b363SPhilipp Reisner if (rv) { 4121b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4122b10d96cbSJohannes Thoma rv = -1; 4123b411b363SPhilipp Reisner goto fail; 4124b411b363SPhilipp Reisner } 4125b411b363SPhilipp Reisner 4126b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4127b411b363SPhilipp Reisner 4128b411b363SPhilipp Reisner if (rv) 4129b411b363SPhilipp Reisner dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", 4130b411b363SPhilipp Reisner resp_size, mdev->net_conf->cram_hmac_alg); 4131b10d96cbSJohannes Thoma else 4132b10d96cbSJohannes Thoma rv = -1; 4133b411b363SPhilipp Reisner 4134b411b363SPhilipp Reisner fail: 4135b411b363SPhilipp Reisner kfree(peers_ch); 4136b411b363SPhilipp Reisner kfree(response); 4137b411b363SPhilipp Reisner kfree(right_response); 4138b411b363SPhilipp Reisner 4139b411b363SPhilipp Reisner return rv; 4140b411b363SPhilipp Reisner } 4141b411b363SPhilipp Reisner #endif 4142b411b363SPhilipp Reisner 4143b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4144b411b363SPhilipp Reisner { 4145b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 4146b411b363SPhilipp Reisner unsigned int minor = mdev_to_minor(mdev); 4147b411b363SPhilipp Reisner int h; 4148b411b363SPhilipp Reisner 4149b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_receiver", minor); 4150b411b363SPhilipp Reisner 4151b411b363SPhilipp Reisner dev_info(DEV, "receiver (re)started\n"); 4152b411b363SPhilipp Reisner 4153b411b363SPhilipp Reisner do { 4154b411b363SPhilipp Reisner h = drbd_connect(mdev); 4155b411b363SPhilipp Reisner if (h == 0) { 4156b411b363SPhilipp Reisner drbd_disconnect(mdev); 415720ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4158b411b363SPhilipp Reisner } 4159b411b363SPhilipp Reisner if (h == -1) { 4160b411b363SPhilipp Reisner dev_warn(DEV, "Discarding network configuration.\n"); 4161b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4162b411b363SPhilipp Reisner } 4163b411b363SPhilipp Reisner } while (h == 0); 4164b411b363SPhilipp Reisner 4165b411b363SPhilipp Reisner if (h > 0) { 4166b411b363SPhilipp Reisner if (get_net_conf(mdev)) { 4167b411b363SPhilipp Reisner drbdd(mdev); 4168b411b363SPhilipp Reisner put_net_conf(mdev); 4169b411b363SPhilipp Reisner } 4170b411b363SPhilipp Reisner } 4171b411b363SPhilipp Reisner 4172b411b363SPhilipp Reisner drbd_disconnect(mdev); 4173b411b363SPhilipp Reisner 4174b411b363SPhilipp Reisner dev_info(DEV, "receiver terminated\n"); 4175b411b363SPhilipp Reisner return 0; 4176b411b363SPhilipp Reisner } 4177b411b363SPhilipp Reisner 4178b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4179b411b363SPhilipp Reisner 41800b70a13dSPhilipp Reisner static int got_RqSReply(struct drbd_conf *mdev, struct p_header80 *h) 4181b411b363SPhilipp Reisner { 4182b411b363SPhilipp Reisner struct p_req_state_reply *p = (struct p_req_state_reply *)h; 4183b411b363SPhilipp Reisner 4184b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4185b411b363SPhilipp Reisner 4186b411b363SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4187b411b363SPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4188b411b363SPhilipp Reisner } else { 4189b411b363SPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4190b411b363SPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4191b411b363SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4192b411b363SPhilipp Reisner } 4193b411b363SPhilipp Reisner wake_up(&mdev->state_wait); 4194b411b363SPhilipp Reisner 419581e84650SAndreas Gruenbacher return true; 4196b411b363SPhilipp Reisner } 4197b411b363SPhilipp Reisner 41980b70a13dSPhilipp Reisner static int got_Ping(struct drbd_conf *mdev, struct p_header80 *h) 4199b411b363SPhilipp Reisner { 4200b411b363SPhilipp Reisner return drbd_send_ping_ack(mdev); 4201b411b363SPhilipp Reisner 4202b411b363SPhilipp Reisner } 4203b411b363SPhilipp Reisner 42040b70a13dSPhilipp Reisner static int got_PingAck(struct drbd_conf *mdev, struct p_header80 *h) 4205b411b363SPhilipp Reisner { 4206b411b363SPhilipp Reisner /* restore idle timeout */ 4207b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 4208309d1608SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags)) 4209309d1608SPhilipp Reisner wake_up(&mdev->misc_wait); 4210b411b363SPhilipp Reisner 421181e84650SAndreas Gruenbacher return true; 4212b411b363SPhilipp Reisner } 4213b411b363SPhilipp Reisner 42140b70a13dSPhilipp Reisner static int got_IsInSync(struct drbd_conf *mdev, struct p_header80 *h) 4215b411b363SPhilipp Reisner { 4216b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4217b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4218b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4219b411b363SPhilipp Reisner 4220b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 4221b411b363SPhilipp Reisner 4222b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4223b411b363SPhilipp Reisner 42241d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4225b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4226b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4227b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4228b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 42291d53f09eSLars Ellenberg put_ldev(mdev); 42301d53f09eSLars Ellenberg } 4231b411b363SPhilipp Reisner dec_rs_pending(mdev); 4232778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4233b411b363SPhilipp Reisner 423481e84650SAndreas Gruenbacher return true; 4235b411b363SPhilipp Reisner } 4236b411b363SPhilipp Reisner 4237b411b363SPhilipp Reisner /* when we receive the ACK for a write request, 4238b411b363SPhilipp Reisner * verify that we actually know about it */ 4239b411b363SPhilipp Reisner static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev, 4240b411b363SPhilipp Reisner u64 id, sector_t sector) 4241b411b363SPhilipp Reisner { 4242b411b363SPhilipp Reisner struct hlist_head *slot = tl_hash_slot(mdev, sector); 4243b411b363SPhilipp Reisner struct hlist_node *n; 4244b411b363SPhilipp Reisner struct drbd_request *req; 4245b411b363SPhilipp Reisner 4246b411b363SPhilipp Reisner hlist_for_each_entry(req, n, slot, colision) { 4247b411b363SPhilipp Reisner if ((unsigned long)req == (unsigned long)id) { 4248b411b363SPhilipp Reisner if (req->sector != sector) { 4249b411b363SPhilipp Reisner dev_err(DEV, "_ack_id_to_req: found req %p but it has " 4250b411b363SPhilipp Reisner "wrong sector (%llus versus %llus)\n", req, 4251b411b363SPhilipp Reisner (unsigned long long)req->sector, 4252b411b363SPhilipp Reisner (unsigned long long)sector); 4253b411b363SPhilipp Reisner break; 4254b411b363SPhilipp Reisner } 4255b411b363SPhilipp Reisner return req; 4256b411b363SPhilipp Reisner } 4257b411b363SPhilipp Reisner } 4258b411b363SPhilipp Reisner return NULL; 4259b411b363SPhilipp Reisner } 4260b411b363SPhilipp Reisner 4261b411b363SPhilipp Reisner typedef struct drbd_request *(req_validator_fn) 4262b411b363SPhilipp Reisner (struct drbd_conf *mdev, u64 id, sector_t sector); 4263b411b363SPhilipp Reisner 4264b411b363SPhilipp Reisner static int validate_req_change_req_state(struct drbd_conf *mdev, 4265b411b363SPhilipp Reisner u64 id, sector_t sector, req_validator_fn validator, 4266b411b363SPhilipp Reisner const char *func, enum drbd_req_event what) 4267b411b363SPhilipp Reisner { 4268b411b363SPhilipp Reisner struct drbd_request *req; 4269b411b363SPhilipp Reisner struct bio_and_error m; 4270b411b363SPhilipp Reisner 4271b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4272b411b363SPhilipp Reisner req = validator(mdev, id, sector); 4273b411b363SPhilipp Reisner if (unlikely(!req)) { 4274b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 42752deb8336SPhilipp Reisner 42762deb8336SPhilipp Reisner dev_err(DEV, "%s: failed to find req %p, sector %llus\n", func, 42772deb8336SPhilipp Reisner (void *)(unsigned long)id, (unsigned long long)sector); 427881e84650SAndreas Gruenbacher return false; 4279b411b363SPhilipp Reisner } 4280b411b363SPhilipp Reisner __req_mod(req, what, &m); 4281b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4282b411b363SPhilipp Reisner 4283b411b363SPhilipp Reisner if (m.bio) 4284b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 428581e84650SAndreas Gruenbacher return true; 4286b411b363SPhilipp Reisner } 4287b411b363SPhilipp Reisner 42880b70a13dSPhilipp Reisner static int got_BlockAck(struct drbd_conf *mdev, struct p_header80 *h) 4289b411b363SPhilipp Reisner { 4290b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4291b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4292b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4293b411b363SPhilipp Reisner enum drbd_req_event what; 4294b411b363SPhilipp Reisner 4295b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4296b411b363SPhilipp Reisner 4297b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4298b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4299b411b363SPhilipp Reisner dec_rs_pending(mdev); 430081e84650SAndreas Gruenbacher return true; 4301b411b363SPhilipp Reisner } 4302b411b363SPhilipp Reisner switch (be16_to_cpu(h->command)) { 4303b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 4304b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4305b411b363SPhilipp Reisner what = write_acked_by_peer_and_sis; 4306b411b363SPhilipp Reisner break; 4307b411b363SPhilipp Reisner case P_WRITE_ACK: 4308b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4309b411b363SPhilipp Reisner what = write_acked_by_peer; 4310b411b363SPhilipp Reisner break; 4311b411b363SPhilipp Reisner case P_RECV_ACK: 4312b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B); 4313b411b363SPhilipp Reisner what = recv_acked_by_peer; 4314b411b363SPhilipp Reisner break; 4315b411b363SPhilipp Reisner case P_DISCARD_ACK: 4316b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4317b411b363SPhilipp Reisner what = conflict_discarded_by_peer; 4318b411b363SPhilipp Reisner break; 4319b411b363SPhilipp Reisner default: 4320b411b363SPhilipp Reisner D_ASSERT(0); 432181e84650SAndreas Gruenbacher return false; 4322b411b363SPhilipp Reisner } 4323b411b363SPhilipp Reisner 4324b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4325b411b363SPhilipp Reisner _ack_id_to_req, __func__ , what); 4326b411b363SPhilipp Reisner } 4327b411b363SPhilipp Reisner 43280b70a13dSPhilipp Reisner static int got_NegAck(struct drbd_conf *mdev, struct p_header80 *h) 4329b411b363SPhilipp Reisner { 4330b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4331b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 43322deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 43332deb8336SPhilipp Reisner struct drbd_request *req; 43342deb8336SPhilipp Reisner struct bio_and_error m; 4335b411b363SPhilipp Reisner 4336b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4337b411b363SPhilipp Reisner 4338b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4339b411b363SPhilipp Reisner dec_rs_pending(mdev); 4340b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 434181e84650SAndreas Gruenbacher return true; 4342b411b363SPhilipp Reisner } 43432deb8336SPhilipp Reisner 43442deb8336SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 43452deb8336SPhilipp Reisner req = _ack_id_to_req(mdev, p->block_id, sector); 43462deb8336SPhilipp Reisner if (!req) { 43472deb8336SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 43482deb8336SPhilipp Reisner if (mdev->net_conf->wire_protocol == DRBD_PROT_A || 43492deb8336SPhilipp Reisner mdev->net_conf->wire_protocol == DRBD_PROT_B) { 43502deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 43512deb8336SPhilipp Reisner The master bio might already be completed, therefore the 43522deb8336SPhilipp Reisner request is no longer in the collision hash. 43532deb8336SPhilipp Reisner => Do not try to validate block_id as request. */ 43542deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 43552deb8336SPhilipp Reisner but then get a P_NEG_ACK after wards. */ 43562deb8336SPhilipp Reisner drbd_set_out_of_sync(mdev, sector, size); 43572deb8336SPhilipp Reisner return true; 43582deb8336SPhilipp Reisner } else { 43592deb8336SPhilipp Reisner dev_err(DEV, "%s: failed to find req %p, sector %llus\n", __func__, 43602deb8336SPhilipp Reisner (void *)(unsigned long)p->block_id, (unsigned long long)sector); 43612deb8336SPhilipp Reisner return false; 43622deb8336SPhilipp Reisner } 43632deb8336SPhilipp Reisner } 43642deb8336SPhilipp Reisner __req_mod(req, neg_acked, &m); 43652deb8336SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 43662deb8336SPhilipp Reisner 43672deb8336SPhilipp Reisner if (m.bio) 43682deb8336SPhilipp Reisner complete_master_bio(mdev, &m); 43692deb8336SPhilipp Reisner return true; 4370b411b363SPhilipp Reisner } 4371b411b363SPhilipp Reisner 43720b70a13dSPhilipp Reisner static int got_NegDReply(struct drbd_conf *mdev, struct p_header80 *h) 4373b411b363SPhilipp Reisner { 4374b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4375b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4376b411b363SPhilipp Reisner 4377b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4378b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4379b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4380b411b363SPhilipp Reisner 4381b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4382b411b363SPhilipp Reisner _ar_id_to_req, __func__ , neg_acked); 4383b411b363SPhilipp Reisner } 4384b411b363SPhilipp Reisner 43850b70a13dSPhilipp Reisner static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header80 *h) 4386b411b363SPhilipp Reisner { 4387b411b363SPhilipp Reisner sector_t sector; 4388b411b363SPhilipp Reisner int size; 4389b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4390b411b363SPhilipp Reisner 4391b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4392b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4393b411b363SPhilipp Reisner 4394b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4395b411b363SPhilipp Reisner 4396b411b363SPhilipp Reisner dec_rs_pending(mdev); 4397b411b363SPhilipp Reisner 4398b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4399b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4400d612d309SPhilipp Reisner switch (be16_to_cpu(h->command)) { 4401d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 4402b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4403d612d309SPhilipp Reisner case P_RS_CANCEL: 4404d612d309SPhilipp Reisner break; 4405d612d309SPhilipp Reisner default: 4406d612d309SPhilipp Reisner D_ASSERT(0); 4407d612d309SPhilipp Reisner put_ldev(mdev); 4408d612d309SPhilipp Reisner return false; 4409d612d309SPhilipp Reisner } 4410b411b363SPhilipp Reisner put_ldev(mdev); 4411b411b363SPhilipp Reisner } 4412b411b363SPhilipp Reisner 441381e84650SAndreas Gruenbacher return true; 4414b411b363SPhilipp Reisner } 4415b411b363SPhilipp Reisner 44160b70a13dSPhilipp Reisner static int got_BarrierAck(struct drbd_conf *mdev, struct p_header80 *h) 4417b411b363SPhilipp Reisner { 4418b411b363SPhilipp Reisner struct p_barrier_ack *p = (struct p_barrier_ack *)h; 4419b411b363SPhilipp Reisner 4420b411b363SPhilipp Reisner tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); 4421b411b363SPhilipp Reisner 4422c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 4423c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 4424370a43e7SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) { 4425370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 4426370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 4427c4752ef1SPhilipp Reisner } 4428c4752ef1SPhilipp Reisner 442981e84650SAndreas Gruenbacher return true; 4430b411b363SPhilipp Reisner } 4431b411b363SPhilipp Reisner 44320b70a13dSPhilipp Reisner static int got_OVResult(struct drbd_conf *mdev, struct p_header80 *h) 4433b411b363SPhilipp Reisner { 4434b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4435b411b363SPhilipp Reisner struct drbd_work *w; 4436b411b363SPhilipp Reisner sector_t sector; 4437b411b363SPhilipp Reisner int size; 4438b411b363SPhilipp Reisner 4439b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4440b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4441b411b363SPhilipp Reisner 4442b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4443b411b363SPhilipp Reisner 4444b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 4445b411b363SPhilipp Reisner drbd_ov_oos_found(mdev, sector, size); 4446b411b363SPhilipp Reisner else 4447b411b363SPhilipp Reisner ov_oos_print(mdev); 4448b411b363SPhilipp Reisner 44491d53f09eSLars Ellenberg if (!get_ldev(mdev)) 445081e84650SAndreas Gruenbacher return true; 44511d53f09eSLars Ellenberg 4452b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4453b411b363SPhilipp Reisner dec_rs_pending(mdev); 4454b411b363SPhilipp Reisner 4455ea5442afSLars Ellenberg --mdev->ov_left; 4456ea5442afSLars Ellenberg 4457ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 4458ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 4459ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 4460ea5442afSLars Ellenberg 4461ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 4462b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4463b411b363SPhilipp Reisner if (w) { 4464b411b363SPhilipp Reisner w->cb = w_ov_finished; 4465b411b363SPhilipp Reisner drbd_queue_work_front(&mdev->data.work, w); 4466b411b363SPhilipp Reisner } else { 4467b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 4468b411b363SPhilipp Reisner ov_oos_print(mdev); 4469b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4470b411b363SPhilipp Reisner } 4471b411b363SPhilipp Reisner } 44721d53f09eSLars Ellenberg put_ldev(mdev); 447381e84650SAndreas Gruenbacher return true; 4474b411b363SPhilipp Reisner } 4475b411b363SPhilipp Reisner 447602918be2SPhilipp Reisner static int got_skip(struct drbd_conf *mdev, struct p_header80 *h) 44770ced55a3SPhilipp Reisner { 447881e84650SAndreas Gruenbacher return true; 44790ced55a3SPhilipp Reisner } 44800ced55a3SPhilipp Reisner 4481b411b363SPhilipp Reisner struct asender_cmd { 4482b411b363SPhilipp Reisner size_t pkt_size; 44830b70a13dSPhilipp Reisner int (*process)(struct drbd_conf *mdev, struct p_header80 *h); 4484b411b363SPhilipp Reisner }; 4485b411b363SPhilipp Reisner 4486b411b363SPhilipp Reisner static struct asender_cmd *get_asender_cmd(int cmd) 4487b411b363SPhilipp Reisner { 4488b411b363SPhilipp Reisner static struct asender_cmd asender_tbl[] = { 4489b411b363SPhilipp Reisner /* anything missing from this table is in 4490b411b363SPhilipp Reisner * the drbd_cmd_handler (drbd_default_handler) table, 4491b411b363SPhilipp Reisner * see the beginning of drbdd() */ 44920b70a13dSPhilipp Reisner [P_PING] = { sizeof(struct p_header80), got_Ping }, 44930b70a13dSPhilipp Reisner [P_PING_ACK] = { sizeof(struct p_header80), got_PingAck }, 4494b411b363SPhilipp Reisner [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4495b411b363SPhilipp Reisner [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4496b411b363SPhilipp Reisner [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4497b411b363SPhilipp Reisner [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4498b411b363SPhilipp Reisner [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 4499b411b363SPhilipp Reisner [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 4500b411b363SPhilipp Reisner [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4501b411b363SPhilipp Reisner [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 4502b411b363SPhilipp Reisner [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 4503b411b363SPhilipp Reisner [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 4504b411b363SPhilipp Reisner [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 450502918be2SPhilipp Reisner [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 4506d612d309SPhilipp Reisner [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4507b411b363SPhilipp Reisner [P_MAX_CMD] = { 0, NULL }, 4508b411b363SPhilipp Reisner }; 4509b411b363SPhilipp Reisner if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) 4510b411b363SPhilipp Reisner return NULL; 4511b411b363SPhilipp Reisner return &asender_tbl[cmd]; 4512b411b363SPhilipp Reisner } 4513b411b363SPhilipp Reisner 4514b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4515b411b363SPhilipp Reisner { 4516b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 451702918be2SPhilipp Reisner struct p_header80 *h = &mdev->meta.rbuf.header.h80; 4518b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 4519b411b363SPhilipp Reisner 4520b411b363SPhilipp Reisner int rv, len; 4521b411b363SPhilipp Reisner void *buf = h; 4522b411b363SPhilipp Reisner int received = 0; 45230b70a13dSPhilipp Reisner int expect = sizeof(struct p_header80); 4524b411b363SPhilipp Reisner int empty; 4525b411b363SPhilipp Reisner 4526b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); 4527b411b363SPhilipp Reisner 4528b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 4529b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 4530b411b363SPhilipp Reisner 4531b411b363SPhilipp Reisner while (get_t_state(thi) == Running) { 4532b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 4533b411b363SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &mdev->flags)) { 4534b411b363SPhilipp Reisner ERR_IF(!drbd_send_ping(mdev)) goto reconnect; 4535b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = 4536b411b363SPhilipp Reisner mdev->net_conf->ping_timeo*HZ/10; 4537b411b363SPhilipp Reisner } 4538b411b363SPhilipp Reisner 4539b411b363SPhilipp Reisner /* conditionally cork; 4540b411b363SPhilipp Reisner * it may hurt latency if we cork without much to send */ 4541b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork && 4542b411b363SPhilipp Reisner 3 < atomic_read(&mdev->unacked_cnt)) 4543b411b363SPhilipp Reisner drbd_tcp_cork(mdev->meta.socket); 4544b411b363SPhilipp Reisner while (1) { 4545b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4546b411b363SPhilipp Reisner flush_signals(current); 45470f8488e1SLars Ellenberg if (!drbd_process_done_ee(mdev)) 4548b411b363SPhilipp Reisner goto reconnect; 4549b411b363SPhilipp Reisner /* to avoid race with newly queued ACKs */ 4550b411b363SPhilipp Reisner set_bit(SIGNAL_ASENDER, &mdev->flags); 4551b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4552b411b363SPhilipp Reisner empty = list_empty(&mdev->done_ee); 4553b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4554b411b363SPhilipp Reisner /* new ack may have been queued right here, 4555b411b363SPhilipp Reisner * but then there is also a signal pending, 4556b411b363SPhilipp Reisner * and we start over... */ 4557b411b363SPhilipp Reisner if (empty) 4558b411b363SPhilipp Reisner break; 4559b411b363SPhilipp Reisner } 4560b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 4561b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork) 4562b411b363SPhilipp Reisner drbd_tcp_uncork(mdev->meta.socket); 4563b411b363SPhilipp Reisner 4564b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 4565b411b363SPhilipp Reisner if (signal_pending(current)) 4566b411b363SPhilipp Reisner continue; 4567b411b363SPhilipp Reisner 4568b411b363SPhilipp Reisner rv = drbd_recv_short(mdev, mdev->meta.socket, 4569b411b363SPhilipp Reisner buf, expect-received, 0); 4570b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4571b411b363SPhilipp Reisner 4572b411b363SPhilipp Reisner flush_signals(current); 4573b411b363SPhilipp Reisner 4574b411b363SPhilipp Reisner /* Note: 4575b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 4576b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 4577b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 4578b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 4579b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 4580b411b363SPhilipp Reisner * rv == expected: full header or command 4581b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 4582b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 4583b411b363SPhilipp Reisner */ 4584b411b363SPhilipp Reisner if (likely(rv > 0)) { 4585b411b363SPhilipp Reisner received += rv; 4586b411b363SPhilipp Reisner buf += rv; 4587b411b363SPhilipp Reisner } else if (rv == 0) { 4588b411b363SPhilipp Reisner dev_err(DEV, "meta connection shut down by peer.\n"); 4589b411b363SPhilipp Reisner goto reconnect; 4590b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 4591b411b363SPhilipp Reisner if (mdev->meta.socket->sk->sk_rcvtimeo == 4592b411b363SPhilipp Reisner mdev->net_conf->ping_timeo*HZ/10) { 4593b411b363SPhilipp Reisner dev_err(DEV, "PingAck did not arrive in time.\n"); 4594b411b363SPhilipp Reisner goto reconnect; 4595b411b363SPhilipp Reisner } 4596b411b363SPhilipp Reisner set_bit(SEND_PING, &mdev->flags); 4597b411b363SPhilipp Reisner continue; 4598b411b363SPhilipp Reisner } else if (rv == -EINTR) { 4599b411b363SPhilipp Reisner continue; 4600b411b363SPhilipp Reisner } else { 4601b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 4602b411b363SPhilipp Reisner goto reconnect; 4603b411b363SPhilipp Reisner } 4604b411b363SPhilipp Reisner 4605b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 4606b411b363SPhilipp Reisner if (unlikely(h->magic != BE_DRBD_MAGIC)) { 4607004352faSLars Ellenberg dev_err(DEV, "magic?? on meta m: 0x%08x c: %d l: %d\n", 4608004352faSLars Ellenberg be32_to_cpu(h->magic), 4609004352faSLars Ellenberg be16_to_cpu(h->command), 4610004352faSLars Ellenberg be16_to_cpu(h->length)); 4611b411b363SPhilipp Reisner goto reconnect; 4612b411b363SPhilipp Reisner } 4613b411b363SPhilipp Reisner cmd = get_asender_cmd(be16_to_cpu(h->command)); 4614b411b363SPhilipp Reisner len = be16_to_cpu(h->length); 4615b411b363SPhilipp Reisner if (unlikely(cmd == NULL)) { 4616004352faSLars Ellenberg dev_err(DEV, "unknown command?? on meta m: 0x%08x c: %d l: %d\n", 4617004352faSLars Ellenberg be32_to_cpu(h->magic), 4618004352faSLars Ellenberg be16_to_cpu(h->command), 4619004352faSLars Ellenberg be16_to_cpu(h->length)); 4620b411b363SPhilipp Reisner goto disconnect; 4621b411b363SPhilipp Reisner } 4622b411b363SPhilipp Reisner expect = cmd->pkt_size; 46230b70a13dSPhilipp Reisner ERR_IF(len != expect-sizeof(struct p_header80)) 4624b411b363SPhilipp Reisner goto reconnect; 4625b411b363SPhilipp Reisner } 4626b411b363SPhilipp Reisner if (received == expect) { 4627b411b363SPhilipp Reisner D_ASSERT(cmd != NULL); 4628b411b363SPhilipp Reisner if (!cmd->process(mdev, h)) 4629b411b363SPhilipp Reisner goto reconnect; 4630b411b363SPhilipp Reisner 4631b411b363SPhilipp Reisner buf = h; 4632b411b363SPhilipp Reisner received = 0; 46330b70a13dSPhilipp Reisner expect = sizeof(struct p_header80); 4634b411b363SPhilipp Reisner cmd = NULL; 4635b411b363SPhilipp Reisner } 4636b411b363SPhilipp Reisner } 4637b411b363SPhilipp Reisner 4638b411b363SPhilipp Reisner if (0) { 4639b411b363SPhilipp Reisner reconnect: 4640b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); 4641856c50c7SLars Ellenberg drbd_md_sync(mdev); 4642b411b363SPhilipp Reisner } 4643b411b363SPhilipp Reisner if (0) { 4644b411b363SPhilipp Reisner disconnect: 4645b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4646856c50c7SLars Ellenberg drbd_md_sync(mdev); 4647b411b363SPhilipp Reisner } 4648b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4649b411b363SPhilipp Reisner 4650b411b363SPhilipp Reisner D_ASSERT(mdev->state.conn < C_CONNECTED); 4651b411b363SPhilipp Reisner dev_info(DEV, "asender terminated\n"); 4652b411b363SPhilipp Reisner 4653b411b363SPhilipp Reisner return 0; 4654b411b363SPhilipp Reisner } 4655