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 322b411b363SPhilipp Reisner if (FAULT_ACTIVE(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) 728b411b363SPhilipp Reisner 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) { 733b411b363SPhilipp Reisner return TRUE; 734b411b363SPhilipp Reisner } else { 735b411b363SPhilipp Reisner sock_release(*sock); 736b411b363SPhilipp Reisner *sock = NULL; 737b411b363SPhilipp Reisner 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() */ 771b411b363SPhilipp Reisner __set_current_state(TASK_INTERRUPTIBLE); 772b411b363SPhilipp Reisner schedule_timeout(HZ / 10); 773b411b363SPhilipp Reisner } 774b411b363SPhilipp Reisner 775b411b363SPhilipp Reisner if (s) { 776b411b363SPhilipp Reisner if (!sock) { 777b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_S); 778b411b363SPhilipp Reisner sock = s; 779b411b363SPhilipp Reisner s = NULL; 780b411b363SPhilipp Reisner } else if (!msock) { 781b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_M); 782b411b363SPhilipp Reisner msock = s; 783b411b363SPhilipp Reisner s = NULL; 784b411b363SPhilipp Reisner } else { 785b411b363SPhilipp Reisner dev_err(DEV, "Logic error in drbd_connect()\n"); 786b411b363SPhilipp Reisner goto out_release_sockets; 787b411b363SPhilipp Reisner } 788b411b363SPhilipp Reisner } 789b411b363SPhilipp Reisner 790b411b363SPhilipp Reisner if (sock && msock) { 791b411b363SPhilipp Reisner __set_current_state(TASK_INTERRUPTIBLE); 792b411b363SPhilipp Reisner schedule_timeout(HZ / 10); 793b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 794b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 795b411b363SPhilipp Reisner if (ok) 796b411b363SPhilipp Reisner break; 797b411b363SPhilipp Reisner } 798b411b363SPhilipp Reisner 799b411b363SPhilipp Reisner retry: 800b411b363SPhilipp Reisner s = drbd_wait_for_connect(mdev); 801b411b363SPhilipp Reisner if (s) { 802b411b363SPhilipp Reisner try = drbd_recv_fp(mdev, s); 803b411b363SPhilipp Reisner drbd_socket_okay(mdev, &sock); 804b411b363SPhilipp Reisner drbd_socket_okay(mdev, &msock); 805b411b363SPhilipp Reisner switch (try) { 806b411b363SPhilipp Reisner case P_HAND_SHAKE_S: 807b411b363SPhilipp Reisner if (sock) { 808b411b363SPhilipp Reisner dev_warn(DEV, "initial packet S crossed\n"); 809b411b363SPhilipp Reisner sock_release(sock); 810b411b363SPhilipp Reisner } 811b411b363SPhilipp Reisner sock = s; 812b411b363SPhilipp Reisner break; 813b411b363SPhilipp Reisner case P_HAND_SHAKE_M: 814b411b363SPhilipp Reisner if (msock) { 815b411b363SPhilipp Reisner dev_warn(DEV, "initial packet M crossed\n"); 816b411b363SPhilipp Reisner sock_release(msock); 817b411b363SPhilipp Reisner } 818b411b363SPhilipp Reisner msock = s; 819b411b363SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &mdev->flags); 820b411b363SPhilipp Reisner break; 821b411b363SPhilipp Reisner default: 822b411b363SPhilipp Reisner dev_warn(DEV, "Error receiving initial packet\n"); 823b411b363SPhilipp Reisner sock_release(s); 824b411b363SPhilipp Reisner if (random32() & 1) 825b411b363SPhilipp Reisner goto retry; 826b411b363SPhilipp Reisner } 827b411b363SPhilipp Reisner } 828b411b363SPhilipp Reisner 829b411b363SPhilipp Reisner if (mdev->state.conn <= C_DISCONNECTING) 830b411b363SPhilipp Reisner goto out_release_sockets; 831b411b363SPhilipp Reisner if (signal_pending(current)) { 832b411b363SPhilipp Reisner flush_signals(current); 833b411b363SPhilipp Reisner smp_rmb(); 834b411b363SPhilipp Reisner if (get_t_state(&mdev->receiver) == Exiting) 835b411b363SPhilipp Reisner goto out_release_sockets; 836b411b363SPhilipp Reisner } 837b411b363SPhilipp Reisner 838b411b363SPhilipp Reisner if (sock && msock) { 839b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 840b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 841b411b363SPhilipp Reisner if (ok) 842b411b363SPhilipp Reisner break; 843b411b363SPhilipp Reisner } 844b411b363SPhilipp Reisner } while (1); 845b411b363SPhilipp Reisner 846b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 847b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 848b411b363SPhilipp Reisner 849b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 850b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 851b411b363SPhilipp Reisner 852b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 853b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 854b411b363SPhilipp Reisner 855b411b363SPhilipp Reisner /* NOT YET ... 856b411b363SPhilipp Reisner * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 857b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 858b411b363SPhilipp Reisner * first set it to the P_HAND_SHAKE timeout, 859b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 860b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = 861b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10; 862b411b363SPhilipp Reisner 863b411b363SPhilipp Reisner msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 864b411b363SPhilipp Reisner msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 865b411b363SPhilipp Reisner 866b411b363SPhilipp Reisner /* we don't want delays. 867b411b363SPhilipp Reisner * we use TCP_CORK where apropriate, though */ 868b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 869b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 870b411b363SPhilipp Reisner 871b411b363SPhilipp Reisner mdev->data.socket = sock; 872b411b363SPhilipp Reisner mdev->meta.socket = msock; 873b411b363SPhilipp Reisner mdev->last_received = jiffies; 874b411b363SPhilipp Reisner 875b411b363SPhilipp Reisner D_ASSERT(mdev->asender.task == NULL); 876b411b363SPhilipp Reisner 877b411b363SPhilipp Reisner h = drbd_do_handshake(mdev); 878b411b363SPhilipp Reisner if (h <= 0) 879b411b363SPhilipp Reisner return h; 880b411b363SPhilipp Reisner 881b411b363SPhilipp Reisner if (mdev->cram_hmac_tfm) { 882b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 883b10d96cbSJohannes Thoma switch (drbd_do_auth(mdev)) { 884b10d96cbSJohannes Thoma case -1: 885b411b363SPhilipp Reisner dev_err(DEV, "Authentication of peer failed\n"); 886b411b363SPhilipp Reisner return -1; 887b10d96cbSJohannes Thoma case 0: 888b10d96cbSJohannes Thoma dev_err(DEV, "Authentication of peer failed, trying again.\n"); 889b10d96cbSJohannes Thoma return 0; 890b411b363SPhilipp Reisner } 891b411b363SPhilipp Reisner } 892b411b363SPhilipp Reisner 893b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS) 894b411b363SPhilipp Reisner return 0; 895b411b363SPhilipp Reisner 896b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 897b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 898b411b363SPhilipp Reisner 899b411b363SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 900b411b363SPhilipp Reisner mdev->peer_seq = 0; 901b411b363SPhilipp Reisner 902b411b363SPhilipp Reisner drbd_thread_start(&mdev->asender); 903b411b363SPhilipp Reisner 904d5373389SPhilipp Reisner if (mdev->agreed_pro_version < 95 && get_ldev(mdev)) { 905d5373389SPhilipp Reisner drbd_setup_queue_param(mdev, DRBD_MAX_SIZE_H80_PACKET); 906d5373389SPhilipp Reisner put_ldev(mdev); 907d5373389SPhilipp Reisner } 908d5373389SPhilipp Reisner 9097e2455c1SPhilipp Reisner if (!drbd_send_protocol(mdev)) 9107e2455c1SPhilipp Reisner return -1; 911b411b363SPhilipp Reisner drbd_send_sync_param(mdev, &mdev->sync_conf); 912e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, 0); 913b411b363SPhilipp Reisner drbd_send_uuids(mdev); 914b411b363SPhilipp Reisner drbd_send_state(mdev); 915b411b363SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 916b411b363SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 917b411b363SPhilipp Reisner 918b411b363SPhilipp Reisner return 1; 919b411b363SPhilipp Reisner 920b411b363SPhilipp Reisner out_release_sockets: 921b411b363SPhilipp Reisner if (sock) 922b411b363SPhilipp Reisner sock_release(sock); 923b411b363SPhilipp Reisner if (msock) 924b411b363SPhilipp Reisner sock_release(msock); 925b411b363SPhilipp Reisner return -1; 926b411b363SPhilipp Reisner } 927b411b363SPhilipp Reisner 92802918be2SPhilipp Reisner static int drbd_recv_header(struct drbd_conf *mdev, enum drbd_packets *cmd, unsigned int *packet_size) 929b411b363SPhilipp Reisner { 93002918be2SPhilipp Reisner union p_header *h = &mdev->data.rbuf.header; 931b411b363SPhilipp Reisner int r; 932b411b363SPhilipp Reisner 933b411b363SPhilipp Reisner r = drbd_recv(mdev, h, sizeof(*h)); 934b411b363SPhilipp Reisner if (unlikely(r != sizeof(*h))) { 935b411b363SPhilipp Reisner dev_err(DEV, "short read expecting header on sock: r=%d\n", r); 936b411b363SPhilipp Reisner return FALSE; 93702918be2SPhilipp Reisner } 93802918be2SPhilipp Reisner 93902918be2SPhilipp Reisner if (likely(h->h80.magic == BE_DRBD_MAGIC)) { 94002918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h80.command); 94102918be2SPhilipp Reisner *packet_size = be16_to_cpu(h->h80.length); 94202918be2SPhilipp Reisner } else if (h->h95.magic == BE_DRBD_MAGIC_BIG) { 94302918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h95.command); 94402918be2SPhilipp Reisner *packet_size = be32_to_cpu(h->h95.length); 94502918be2SPhilipp Reisner } else { 946004352faSLars Ellenberg dev_err(DEV, "magic?? on data m: 0x%08x c: %d l: %d\n", 947004352faSLars Ellenberg be32_to_cpu(h->h80.magic), 948004352faSLars Ellenberg be16_to_cpu(h->h80.command), 949004352faSLars Ellenberg be16_to_cpu(h->h80.length)); 950b411b363SPhilipp Reisner return FALSE; 951b411b363SPhilipp Reisner } 952b411b363SPhilipp Reisner mdev->last_received = jiffies; 953b411b363SPhilipp Reisner 954b411b363SPhilipp Reisner return TRUE; 955b411b363SPhilipp Reisner } 956b411b363SPhilipp Reisner 9572451fc3bSPhilipp Reisner static void drbd_flush(struct drbd_conf *mdev) 958b411b363SPhilipp Reisner { 959b411b363SPhilipp Reisner int rv; 960b411b363SPhilipp Reisner 961b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 962fbd9b09aSDmitry Monakhov rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, 963dd3932edSChristoph Hellwig NULL); 964b411b363SPhilipp Reisner if (rv) { 965b411b363SPhilipp Reisner dev_err(DEV, "local disk flush failed with status %d\n", rv); 966b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 967b411b363SPhilipp Reisner * don't try again for ANY return value != 0 968b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 969b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 970b411b363SPhilipp Reisner } 971b411b363SPhilipp Reisner put_ldev(mdev); 972b411b363SPhilipp Reisner } 973b411b363SPhilipp Reisner } 974b411b363SPhilipp Reisner 975b411b363SPhilipp Reisner /** 976b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 977b411b363SPhilipp Reisner * @mdev: DRBD device. 978b411b363SPhilipp Reisner * @epoch: Epoch object. 979b411b363SPhilipp Reisner * @ev: Epoch event. 980b411b363SPhilipp Reisner */ 981b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 982b411b363SPhilipp Reisner struct drbd_epoch *epoch, 983b411b363SPhilipp Reisner enum epoch_event ev) 984b411b363SPhilipp Reisner { 9852451fc3bSPhilipp Reisner int epoch_size; 986b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 987b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 988b411b363SPhilipp Reisner 989b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 990b411b363SPhilipp Reisner do { 991b411b363SPhilipp Reisner next_epoch = NULL; 992b411b363SPhilipp Reisner 993b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 994b411b363SPhilipp Reisner 995b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 996b411b363SPhilipp Reisner case EV_PUT: 997b411b363SPhilipp Reisner atomic_dec(&epoch->active); 998b411b363SPhilipp Reisner break; 999b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1000b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1001b411b363SPhilipp Reisner break; 1002b411b363SPhilipp Reisner case EV_BECAME_LAST: 1003b411b363SPhilipp Reisner /* nothing to do*/ 1004b411b363SPhilipp Reisner break; 1005b411b363SPhilipp Reisner } 1006b411b363SPhilipp Reisner 1007b411b363SPhilipp Reisner if (epoch_size != 0 && 1008b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 10092451fc3bSPhilipp Reisner test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) { 1010b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1011b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1012b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1013b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1014b411b363SPhilipp Reisner } 1015b411b363SPhilipp Reisner dec_unacked(mdev); 1016b411b363SPhilipp Reisner 1017b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1018b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1019b411b363SPhilipp Reisner list_del(&epoch->list); 1020b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1021b411b363SPhilipp Reisner mdev->epochs--; 1022b411b363SPhilipp Reisner kfree(epoch); 1023b411b363SPhilipp Reisner 1024b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1025b411b363SPhilipp Reisner rv = FE_DESTROYED; 1026b411b363SPhilipp Reisner } else { 1027b411b363SPhilipp Reisner epoch->flags = 0; 1028b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1029698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1030b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1031b411b363SPhilipp Reisner rv = FE_RECYCLED; 10322451fc3bSPhilipp Reisner wake_up(&mdev->ee_wait); 1033b411b363SPhilipp Reisner } 1034b411b363SPhilipp Reisner } 1035b411b363SPhilipp Reisner 1036b411b363SPhilipp Reisner if (!next_epoch) 1037b411b363SPhilipp Reisner break; 1038b411b363SPhilipp Reisner 1039b411b363SPhilipp Reisner epoch = next_epoch; 1040b411b363SPhilipp Reisner } while (1); 1041b411b363SPhilipp Reisner 1042b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1043b411b363SPhilipp Reisner 1044b411b363SPhilipp Reisner return rv; 1045b411b363SPhilipp Reisner } 1046b411b363SPhilipp Reisner 1047b411b363SPhilipp Reisner /** 1048b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1049b411b363SPhilipp Reisner * @mdev: DRBD device. 1050b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1051b411b363SPhilipp Reisner */ 1052b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1053b411b363SPhilipp Reisner { 1054b411b363SPhilipp Reisner enum write_ordering_e pwo; 1055b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1056b411b363SPhilipp Reisner [WO_none] = "none", 1057b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1058b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1059b411b363SPhilipp Reisner }; 1060b411b363SPhilipp Reisner 1061b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1062b411b363SPhilipp Reisner wo = min(pwo, wo); 1063b411b363SPhilipp Reisner if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) 1064b411b363SPhilipp Reisner wo = WO_drain_io; 1065b411b363SPhilipp Reisner if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) 1066b411b363SPhilipp Reisner wo = WO_none; 1067b411b363SPhilipp Reisner mdev->write_ordering = wo; 10682451fc3bSPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bdev_flush) 1069b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1070b411b363SPhilipp Reisner } 1071b411b363SPhilipp Reisner 1072b411b363SPhilipp Reisner /** 107345bb912bSLars Ellenberg * drbd_submit_ee() 107445bb912bSLars Ellenberg * @mdev: DRBD device. 107545bb912bSLars Ellenberg * @e: epoch entry 107645bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 107745bb912bSLars Ellenberg */ 107845bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 107945bb912bSLars Ellenberg int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, 108045bb912bSLars Ellenberg const unsigned rw, const int fault_type) 108145bb912bSLars Ellenberg { 108245bb912bSLars Ellenberg struct bio *bios = NULL; 108345bb912bSLars Ellenberg struct bio *bio; 108445bb912bSLars Ellenberg struct page *page = e->pages; 108545bb912bSLars Ellenberg sector_t sector = e->sector; 108645bb912bSLars Ellenberg unsigned ds = e->size; 108745bb912bSLars Ellenberg unsigned n_bios = 0; 108845bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 108945bb912bSLars Ellenberg 109045bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 109145bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 109245bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 109345bb912bSLars Ellenberg * request in more than one bio. */ 109445bb912bSLars Ellenberg next_bio: 109545bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 109645bb912bSLars Ellenberg if (!bio) { 109745bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 109845bb912bSLars Ellenberg goto fail; 109945bb912bSLars Ellenberg } 110045bb912bSLars Ellenberg /* > e->sector, unless this is the first bio */ 110145bb912bSLars Ellenberg bio->bi_sector = sector; 110245bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 110345bb912bSLars Ellenberg bio->bi_rw = rw; 110445bb912bSLars Ellenberg bio->bi_private = e; 110545bb912bSLars Ellenberg bio->bi_end_io = drbd_endio_sec; 110645bb912bSLars Ellenberg 110745bb912bSLars Ellenberg bio->bi_next = bios; 110845bb912bSLars Ellenberg bios = bio; 110945bb912bSLars Ellenberg ++n_bios; 111045bb912bSLars Ellenberg 111145bb912bSLars Ellenberg page_chain_for_each(page) { 111245bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 111345bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 111445bb912bSLars Ellenberg /* a single page must always be possible! */ 111545bb912bSLars Ellenberg BUG_ON(bio->bi_vcnt == 0); 111645bb912bSLars Ellenberg goto next_bio; 111745bb912bSLars Ellenberg } 111845bb912bSLars Ellenberg ds -= len; 111945bb912bSLars Ellenberg sector += len >> 9; 112045bb912bSLars Ellenberg --nr_pages; 112145bb912bSLars Ellenberg } 112245bb912bSLars Ellenberg D_ASSERT(page == NULL); 112345bb912bSLars Ellenberg D_ASSERT(ds == 0); 112445bb912bSLars Ellenberg 112545bb912bSLars Ellenberg atomic_set(&e->pending_bios, n_bios); 112645bb912bSLars Ellenberg do { 112745bb912bSLars Ellenberg bio = bios; 112845bb912bSLars Ellenberg bios = bios->bi_next; 112945bb912bSLars Ellenberg bio->bi_next = NULL; 113045bb912bSLars Ellenberg 113145bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 113245bb912bSLars Ellenberg } while (bios); 113345bb912bSLars Ellenberg return 0; 113445bb912bSLars Ellenberg 113545bb912bSLars Ellenberg fail: 113645bb912bSLars Ellenberg while (bios) { 113745bb912bSLars Ellenberg bio = bios; 113845bb912bSLars Ellenberg bios = bios->bi_next; 113945bb912bSLars Ellenberg bio_put(bio); 114045bb912bSLars Ellenberg } 114145bb912bSLars Ellenberg return -ENOMEM; 114245bb912bSLars Ellenberg } 114345bb912bSLars Ellenberg 114402918be2SPhilipp Reisner static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1145b411b363SPhilipp Reisner { 11462451fc3bSPhilipp Reisner int rv; 114702918be2SPhilipp Reisner struct p_barrier *p = &mdev->data.rbuf.barrier; 1148b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1149b411b363SPhilipp Reisner 1150b411b363SPhilipp Reisner inc_unacked(mdev); 1151b411b363SPhilipp Reisner 1152b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1153b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1154b411b363SPhilipp Reisner 1155b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1156b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1157b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1158b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1159b411b363SPhilipp Reisner * completed. */ 1160b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1161b411b363SPhilipp Reisner case WO_none: 1162b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 1163b411b363SPhilipp Reisner return TRUE; 1164b411b363SPhilipp Reisner 1165b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1166b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1167b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 11682451fc3bSPhilipp Reisner if (epoch) 11692451fc3bSPhilipp Reisner break; 11702451fc3bSPhilipp Reisner else 1171b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 11722451fc3bSPhilipp Reisner /* Fall through */ 11732451fc3bSPhilipp Reisner 11742451fc3bSPhilipp Reisner case WO_bdev_flush: 11752451fc3bSPhilipp Reisner case WO_drain_io: 1176b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 11772451fc3bSPhilipp Reisner drbd_flush(mdev); 11782451fc3bSPhilipp Reisner 11792451fc3bSPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 11802451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 11812451fc3bSPhilipp Reisner if (epoch) 11822451fc3bSPhilipp Reisner break; 1183b411b363SPhilipp Reisner } 1184b411b363SPhilipp Reisner 11852451fc3bSPhilipp Reisner epoch = mdev->current_epoch; 11862451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 11872451fc3bSPhilipp Reisner 11882451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 11892451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1190b411b363SPhilipp Reisner 1191b411b363SPhilipp Reisner return TRUE; 11922451fc3bSPhilipp Reisner default: 11932451fc3bSPhilipp Reisner dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); 11942451fc3bSPhilipp Reisner return FALSE; 1195b411b363SPhilipp Reisner } 1196b411b363SPhilipp Reisner 1197b411b363SPhilipp Reisner epoch->flags = 0; 1198b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1199b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1200b411b363SPhilipp Reisner 1201b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1202b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1203b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1204b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1205b411b363SPhilipp Reisner mdev->epochs++; 1206b411b363SPhilipp Reisner } else { 1207b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1208b411b363SPhilipp Reisner kfree(epoch); 1209b411b363SPhilipp Reisner } 1210b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1211b411b363SPhilipp Reisner 1212b411b363SPhilipp Reisner return TRUE; 1213b411b363SPhilipp Reisner } 1214b411b363SPhilipp Reisner 1215b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1216b411b363SPhilipp Reisner * and from receive_Data */ 1217b411b363SPhilipp Reisner static struct drbd_epoch_entry * 1218b411b363SPhilipp Reisner read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local) 1219b411b363SPhilipp Reisner { 12206666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1221b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1222b411b363SPhilipp Reisner struct page *page; 122345bb912bSLars Ellenberg int dgs, ds, rr; 1224b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1225b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 12266b4388acSPhilipp Reisner unsigned long *data; 1227b411b363SPhilipp Reisner 1228b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1229b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1230b411b363SPhilipp Reisner 1231b411b363SPhilipp Reisner if (dgs) { 1232b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1233b411b363SPhilipp Reisner if (rr != dgs) { 1234b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data digest: read %d expected %d\n", 1235b411b363SPhilipp Reisner rr, dgs); 1236b411b363SPhilipp Reisner return NULL; 1237b411b363SPhilipp Reisner } 1238b411b363SPhilipp Reisner } 1239b411b363SPhilipp Reisner 1240b411b363SPhilipp Reisner data_size -= dgs; 1241b411b363SPhilipp Reisner 1242b411b363SPhilipp Reisner ERR_IF(data_size & 0x1ff) return NULL; 12431816a2b4SLars Ellenberg ERR_IF(data_size > DRBD_MAX_BIO_SIZE) return NULL; 1244b411b363SPhilipp Reisner 12456666032aSLars Ellenberg /* even though we trust out peer, 12466666032aSLars Ellenberg * we sometimes have to double check. */ 12476666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 12486666032aSLars Ellenberg dev_err(DEV, "capacity: %llus < sector: %llus + size: %u\n", 12496666032aSLars Ellenberg (unsigned long long)capacity, 12506666032aSLars Ellenberg (unsigned long long)sector, data_size); 12516666032aSLars Ellenberg return NULL; 12526666032aSLars Ellenberg } 12536666032aSLars Ellenberg 1254b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1255b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1256b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1257b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); 1258b411b363SPhilipp Reisner if (!e) 1259b411b363SPhilipp Reisner return NULL; 126045bb912bSLars Ellenberg 1261b411b363SPhilipp Reisner ds = data_size; 126245bb912bSLars Ellenberg page = e->pages; 126345bb912bSLars Ellenberg page_chain_for_each(page) { 126445bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 12656b4388acSPhilipp Reisner data = kmap(page); 126645bb912bSLars Ellenberg rr = drbd_recv(mdev, data, len); 12676b4388acSPhilipp Reisner if (FAULT_ACTIVE(mdev, DRBD_FAULT_RECEIVE)) { 12686b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 12696b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 12706b4388acSPhilipp Reisner } 1271b411b363SPhilipp Reisner kunmap(page); 127245bb912bSLars Ellenberg if (rr != len) { 1273b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1274b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 127545bb912bSLars Ellenberg rr, len); 1276b411b363SPhilipp Reisner return NULL; 1277b411b363SPhilipp Reisner } 1278b411b363SPhilipp Reisner ds -= rr; 1279b411b363SPhilipp Reisner } 1280b411b363SPhilipp Reisner 1281b411b363SPhilipp Reisner if (dgs) { 128245bb912bSLars Ellenberg drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv); 1283b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1284470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1285470be44aSLars Ellenberg (unsigned long long)sector, data_size); 1286b411b363SPhilipp Reisner drbd_bcast_ee(mdev, "digest failed", 1287b411b363SPhilipp Reisner dgs, dig_in, dig_vv, e); 1288b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1289b411b363SPhilipp Reisner return NULL; 1290b411b363SPhilipp Reisner } 1291b411b363SPhilipp Reisner } 1292b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1293b411b363SPhilipp Reisner return e; 1294b411b363SPhilipp Reisner } 1295b411b363SPhilipp Reisner 1296b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1297b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1298b411b363SPhilipp Reisner */ 1299b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1300b411b363SPhilipp Reisner { 1301b411b363SPhilipp Reisner struct page *page; 1302b411b363SPhilipp Reisner int rr, rv = 1; 1303b411b363SPhilipp Reisner void *data; 1304b411b363SPhilipp Reisner 1305c3470cdeSLars Ellenberg if (!data_size) 1306c3470cdeSLars Ellenberg return TRUE; 1307c3470cdeSLars Ellenberg 130845bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, 1, 1); 1309b411b363SPhilipp Reisner 1310b411b363SPhilipp Reisner data = kmap(page); 1311b411b363SPhilipp Reisner while (data_size) { 1312b411b363SPhilipp Reisner rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); 1313b411b363SPhilipp Reisner if (rr != min_t(int, data_size, PAGE_SIZE)) { 1314b411b363SPhilipp Reisner rv = 0; 1315b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 1316b411b363SPhilipp Reisner rr, min_t(int, data_size, PAGE_SIZE)); 1317b411b363SPhilipp Reisner break; 1318b411b363SPhilipp Reisner } 1319b411b363SPhilipp Reisner data_size -= rr; 1320b411b363SPhilipp Reisner } 1321b411b363SPhilipp Reisner kunmap(page); 1322435f0740SLars Ellenberg drbd_pp_free(mdev, page, 0); 1323b411b363SPhilipp Reisner return rv; 1324b411b363SPhilipp Reisner } 1325b411b363SPhilipp Reisner 1326b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1327b411b363SPhilipp Reisner sector_t sector, int data_size) 1328b411b363SPhilipp Reisner { 1329b411b363SPhilipp Reisner struct bio_vec *bvec; 1330b411b363SPhilipp Reisner struct bio *bio; 1331b411b363SPhilipp Reisner int dgs, rr, i, expect; 1332b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1333b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 1334b411b363SPhilipp Reisner 1335b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1336b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1337b411b363SPhilipp Reisner 1338b411b363SPhilipp Reisner if (dgs) { 1339b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1340b411b363SPhilipp Reisner if (rr != dgs) { 1341b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n", 1342b411b363SPhilipp Reisner rr, dgs); 1343b411b363SPhilipp Reisner return 0; 1344b411b363SPhilipp Reisner } 1345b411b363SPhilipp Reisner } 1346b411b363SPhilipp Reisner 1347b411b363SPhilipp Reisner data_size -= dgs; 1348b411b363SPhilipp Reisner 1349b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1350b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1351b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1352b411b363SPhilipp Reisner 1353b411b363SPhilipp Reisner bio = req->master_bio; 1354b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1355b411b363SPhilipp Reisner 1356b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1357b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1358b411b363SPhilipp Reisner rr = drbd_recv(mdev, 1359b411b363SPhilipp Reisner kmap(bvec->bv_page)+bvec->bv_offset, 1360b411b363SPhilipp Reisner expect); 1361b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1362b411b363SPhilipp Reisner if (rr != expect) { 1363b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply: " 1364b411b363SPhilipp Reisner "read %d expected %d\n", 1365b411b363SPhilipp Reisner rr, expect); 1366b411b363SPhilipp Reisner return 0; 1367b411b363SPhilipp Reisner } 1368b411b363SPhilipp Reisner data_size -= rr; 1369b411b363SPhilipp Reisner } 1370b411b363SPhilipp Reisner 1371b411b363SPhilipp Reisner if (dgs) { 137245bb912bSLars Ellenberg drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv); 1373b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1374b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 1375b411b363SPhilipp Reisner return 0; 1376b411b363SPhilipp Reisner } 1377b411b363SPhilipp Reisner } 1378b411b363SPhilipp Reisner 1379b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 1380b411b363SPhilipp Reisner return 1; 1381b411b363SPhilipp Reisner } 1382b411b363SPhilipp Reisner 1383b411b363SPhilipp Reisner /* e_end_resync_block() is called via 1384b411b363SPhilipp Reisner * drbd_process_done_ee() by asender only */ 1385b411b363SPhilipp Reisner static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1386b411b363SPhilipp Reisner { 1387b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1388b411b363SPhilipp Reisner sector_t sector = e->sector; 1389b411b363SPhilipp Reisner int ok; 1390b411b363SPhilipp Reisner 1391b411b363SPhilipp Reisner D_ASSERT(hlist_unhashed(&e->colision)); 1392b411b363SPhilipp Reisner 139345bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1394b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1395b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e); 1396b411b363SPhilipp Reisner } else { 1397b411b363SPhilipp Reisner /* Record failure to sync */ 1398b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, e->size); 1399b411b363SPhilipp Reisner 1400b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1401b411b363SPhilipp Reisner } 1402b411b363SPhilipp Reisner dec_unacked(mdev); 1403b411b363SPhilipp Reisner 1404b411b363SPhilipp Reisner return ok; 1405b411b363SPhilipp Reisner } 1406b411b363SPhilipp Reisner 1407b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1408b411b363SPhilipp Reisner { 1409b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1410b411b363SPhilipp Reisner 1411b411b363SPhilipp Reisner e = read_in_block(mdev, ID_SYNCER, sector, data_size); 141245bb912bSLars Ellenberg if (!e) 141345bb912bSLars Ellenberg goto fail; 1414b411b363SPhilipp Reisner 1415b411b363SPhilipp Reisner dec_rs_pending(mdev); 1416b411b363SPhilipp Reisner 1417b411b363SPhilipp Reisner inc_unacked(mdev); 1418b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1419b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1420b411b363SPhilipp Reisner 142145bb912bSLars Ellenberg e->w.cb = e_end_resync_block; 142245bb912bSLars Ellenberg 1423b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1424b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->sync_ee); 1425b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1426b411b363SPhilipp Reisner 14270f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 142845bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0) 1429b411b363SPhilipp Reisner return TRUE; 143045bb912bSLars Ellenberg 143122cc37a9SLars Ellenberg /* drbd_submit_ee currently fails for one reason only: 143222cc37a9SLars Ellenberg * not being able to allocate enough bios. 143322cc37a9SLars Ellenberg * Is dropping the connection going to help? */ 143422cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 143522cc37a9SLars Ellenberg list_del(&e->w.list); 143622cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 143722cc37a9SLars Ellenberg 143845bb912bSLars Ellenberg drbd_free_ee(mdev, e); 143945bb912bSLars Ellenberg fail: 144045bb912bSLars Ellenberg put_ldev(mdev); 144145bb912bSLars Ellenberg return FALSE; 1442b411b363SPhilipp Reisner } 1443b411b363SPhilipp Reisner 144402918be2SPhilipp Reisner static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1445b411b363SPhilipp Reisner { 1446b411b363SPhilipp Reisner struct drbd_request *req; 1447b411b363SPhilipp Reisner sector_t sector; 1448b411b363SPhilipp Reisner int ok; 144902918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1450b411b363SPhilipp Reisner 1451b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1452b411b363SPhilipp Reisner 1453b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1454b411b363SPhilipp Reisner req = _ar_id_to_req(mdev, p->block_id, sector); 1455b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1456b411b363SPhilipp Reisner if (unlikely(!req)) { 1457b411b363SPhilipp Reisner dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n"); 1458b411b363SPhilipp Reisner return FALSE; 1459b411b363SPhilipp Reisner } 1460b411b363SPhilipp Reisner 1461b411b363SPhilipp Reisner /* hlist_del(&req->colision) is done in _req_may_be_done, to avoid 1462b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1463b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1464b411b363SPhilipp Reisner ok = recv_dless_read(mdev, req, sector, data_size); 1465b411b363SPhilipp Reisner 1466b411b363SPhilipp Reisner if (ok) 1467b411b363SPhilipp Reisner req_mod(req, data_received); 1468b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1469b411b363SPhilipp Reisner * I don't think we may complete this just yet 1470b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1471b411b363SPhilipp Reisner 1472b411b363SPhilipp Reisner return ok; 1473b411b363SPhilipp Reisner } 1474b411b363SPhilipp Reisner 147502918be2SPhilipp Reisner static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1476b411b363SPhilipp Reisner { 1477b411b363SPhilipp Reisner sector_t sector; 1478b411b363SPhilipp Reisner int ok; 147902918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1480b411b363SPhilipp Reisner 1481b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1482b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1483b411b363SPhilipp Reisner 1484b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1485b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1486b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1487b411b363SPhilipp Reisner * or in drbd_endio_write_sec. */ 1488b411b363SPhilipp Reisner ok = recv_resync_read(mdev, sector, data_size); 1489b411b363SPhilipp Reisner } else { 1490b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1491b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1492b411b363SPhilipp Reisner 1493b411b363SPhilipp Reisner ok = drbd_drain_block(mdev, data_size); 1494b411b363SPhilipp Reisner 14952b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1496b411b363SPhilipp Reisner } 1497b411b363SPhilipp Reisner 1498778f271dSPhilipp Reisner atomic_add(data_size >> 9, &mdev->rs_sect_in); 1499778f271dSPhilipp Reisner 1500b411b363SPhilipp Reisner return ok; 1501b411b363SPhilipp Reisner } 1502b411b363SPhilipp Reisner 1503b411b363SPhilipp Reisner /* e_end_block() is called via drbd_process_done_ee(). 1504b411b363SPhilipp Reisner * this means this function only runs in the asender thread 1505b411b363SPhilipp Reisner */ 1506b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1507b411b363SPhilipp Reisner { 1508b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1509b411b363SPhilipp Reisner sector_t sector = e->sector; 1510b411b363SPhilipp Reisner int ok = 1, pcmd; 1511b411b363SPhilipp Reisner 1512b411b363SPhilipp Reisner if (mdev->net_conf->wire_protocol == DRBD_PROT_C) { 151345bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1514b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1515b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1516b411b363SPhilipp Reisner e->flags & EE_MAY_SET_IN_SYNC) ? 1517b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 1518b411b363SPhilipp Reisner ok &= drbd_send_ack(mdev, pcmd, e); 1519b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1520b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1521b411b363SPhilipp Reisner } else { 1522b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1523b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1524b411b363SPhilipp Reisner * maybe assert this? */ 1525b411b363SPhilipp Reisner } 1526b411b363SPhilipp Reisner dec_unacked(mdev); 1527b411b363SPhilipp Reisner } 1528b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1529b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 1530b411b363SPhilipp Reisner if (mdev->net_conf->two_primaries) { 1531b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1532b411b363SPhilipp Reisner D_ASSERT(!hlist_unhashed(&e->colision)); 1533b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1534b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1535b411b363SPhilipp Reisner } else { 1536b411b363SPhilipp Reisner D_ASSERT(hlist_unhashed(&e->colision)); 1537b411b363SPhilipp Reisner } 1538b411b363SPhilipp Reisner 1539b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1540b411b363SPhilipp Reisner 1541b411b363SPhilipp Reisner return ok; 1542b411b363SPhilipp Reisner } 1543b411b363SPhilipp Reisner 1544b411b363SPhilipp Reisner static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1545b411b363SPhilipp Reisner { 1546b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1547b411b363SPhilipp Reisner int ok = 1; 1548b411b363SPhilipp Reisner 1549b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1550b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_DISCARD_ACK, e); 1551b411b363SPhilipp Reisner 1552b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1553b411b363SPhilipp Reisner D_ASSERT(!hlist_unhashed(&e->colision)); 1554b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1555b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1556b411b363SPhilipp Reisner 1557b411b363SPhilipp Reisner dec_unacked(mdev); 1558b411b363SPhilipp Reisner 1559b411b363SPhilipp Reisner return ok; 1560b411b363SPhilipp Reisner } 1561b411b363SPhilipp Reisner 1562b411b363SPhilipp Reisner /* Called from receive_Data. 1563b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1564b411b363SPhilipp Reisner * 1565b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1566b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1567b411b363SPhilipp Reisner * been sent. 1568b411b363SPhilipp Reisner * 1569b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1570b411b363SPhilipp Reisner * 1571b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1572b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1573b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1574b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1575b411b363SPhilipp Reisner * 1576b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1577b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1578b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1579b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1580b411b363SPhilipp Reisner * 1581b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1582b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 1583b411b363SPhilipp Reisner static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) 1584b411b363SPhilipp Reisner { 1585b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1586b411b363SPhilipp Reisner unsigned int p_seq; 1587b411b363SPhilipp Reisner long timeout; 1588b411b363SPhilipp Reisner int ret = 0; 1589b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1590b411b363SPhilipp Reisner for (;;) { 1591b411b363SPhilipp Reisner prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1592b411b363SPhilipp Reisner if (seq_le(packet_seq, mdev->peer_seq+1)) 1593b411b363SPhilipp Reisner break; 1594b411b363SPhilipp Reisner if (signal_pending(current)) { 1595b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1596b411b363SPhilipp Reisner break; 1597b411b363SPhilipp Reisner } 1598b411b363SPhilipp Reisner p_seq = mdev->peer_seq; 1599b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1600b411b363SPhilipp Reisner timeout = schedule_timeout(30*HZ); 1601b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1602b411b363SPhilipp Reisner if (timeout == 0 && p_seq == mdev->peer_seq) { 1603b411b363SPhilipp Reisner ret = -ETIMEDOUT; 1604b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); 1605b411b363SPhilipp Reisner break; 1606b411b363SPhilipp Reisner } 1607b411b363SPhilipp Reisner } 1608b411b363SPhilipp Reisner finish_wait(&mdev->seq_wait, &wait); 1609b411b363SPhilipp Reisner if (mdev->peer_seq+1 == packet_seq) 1610b411b363SPhilipp Reisner mdev->peer_seq++; 1611b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1612b411b363SPhilipp Reisner return ret; 1613b411b363SPhilipp Reisner } 1614b411b363SPhilipp Reisner 1615688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1616688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1617688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1618688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 161976d2e7ecSPhilipp Reisner { 162076d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 162176d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1622688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 162376d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 162476d2e7ecSPhilipp Reisner } 162576d2e7ecSPhilipp Reisner 1626b411b363SPhilipp Reisner /* mirrored write */ 162702918be2SPhilipp Reisner static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 1628b411b363SPhilipp Reisner { 1629b411b363SPhilipp Reisner sector_t sector; 1630b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 163102918be2SPhilipp Reisner struct p_data *p = &mdev->data.rbuf.data; 1632b411b363SPhilipp Reisner int rw = WRITE; 1633b411b363SPhilipp Reisner u32 dp_flags; 1634b411b363SPhilipp Reisner 1635b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 1636b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1637b411b363SPhilipp Reisner dev_err(DEV, "Can not write mirrored data block " 1638b411b363SPhilipp Reisner "to local disk.\n"); 1639b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1640b411b363SPhilipp Reisner if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) 1641b411b363SPhilipp Reisner mdev->peer_seq++; 1642b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1643b411b363SPhilipp Reisner 16442b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1645b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 1646b411b363SPhilipp Reisner return drbd_drain_block(mdev, data_size); 1647b411b363SPhilipp Reisner } 1648b411b363SPhilipp Reisner 1649b411b363SPhilipp Reisner /* get_ldev(mdev) successful. 1650b411b363SPhilipp Reisner * Corresponding put_ldev done either below (on various errors), 1651b411b363SPhilipp Reisner * or in drbd_endio_write_sec, if we successfully submit the data at 1652b411b363SPhilipp Reisner * the end of this function. */ 1653b411b363SPhilipp Reisner 1654b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1655b411b363SPhilipp Reisner e = read_in_block(mdev, p->block_id, sector, data_size); 1656b411b363SPhilipp Reisner if (!e) { 1657b411b363SPhilipp Reisner put_ldev(mdev); 1658b411b363SPhilipp Reisner return FALSE; 1659b411b363SPhilipp Reisner } 1660b411b363SPhilipp Reisner 1661b411b363SPhilipp Reisner e->w.cb = e_end_block; 1662b411b363SPhilipp Reisner 1663688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 1664688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 1665688593c5SLars Ellenberg 1666688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 1667688593c5SLars Ellenberg e->flags |= EE_MAY_SET_IN_SYNC; 1668688593c5SLars Ellenberg 1669b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1670b411b363SPhilipp Reisner e->epoch = mdev->current_epoch; 1671b411b363SPhilipp Reisner atomic_inc(&e->epoch->epoch_size); 1672b411b363SPhilipp Reisner atomic_inc(&e->epoch->active); 1673b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1674b411b363SPhilipp Reisner 1675b411b363SPhilipp Reisner /* I'm the receiver, I do hold a net_cnt reference. */ 1676b411b363SPhilipp Reisner if (!mdev->net_conf->two_primaries) { 1677b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1678b411b363SPhilipp Reisner } else { 1679b411b363SPhilipp Reisner /* don't get the req_lock yet, 1680b411b363SPhilipp Reisner * we may sleep in drbd_wait_peer_seq */ 1681b411b363SPhilipp Reisner const int size = e->size; 1682b411b363SPhilipp Reisner const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1683b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1684b411b363SPhilipp Reisner struct drbd_request *i; 1685b411b363SPhilipp Reisner struct hlist_node *n; 1686b411b363SPhilipp Reisner struct hlist_head *slot; 1687b411b363SPhilipp Reisner int first; 1688b411b363SPhilipp Reisner 1689b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1690b411b363SPhilipp Reisner BUG_ON(mdev->ee_hash == NULL); 1691b411b363SPhilipp Reisner BUG_ON(mdev->tl_hash == NULL); 1692b411b363SPhilipp Reisner 1693b411b363SPhilipp Reisner /* conflict detection and handling: 1694b411b363SPhilipp Reisner * 1. wait on the sequence number, 1695b411b363SPhilipp Reisner * in case this data packet overtook ACK packets. 1696b411b363SPhilipp Reisner * 2. check our hash tables for conflicting requests. 1697b411b363SPhilipp Reisner * we only need to walk the tl_hash, since an ee can not 1698b411b363SPhilipp Reisner * have a conflict with an other ee: on the submitting 1699b411b363SPhilipp Reisner * node, the corresponding req had already been conflicting, 1700b411b363SPhilipp Reisner * and a conflicting req is never sent. 1701b411b363SPhilipp Reisner * 1702b411b363SPhilipp Reisner * Note: for two_primaries, we are protocol C, 1703b411b363SPhilipp Reisner * so there cannot be any request that is DONE 1704b411b363SPhilipp Reisner * but still on the transfer log. 1705b411b363SPhilipp Reisner * 1706b411b363SPhilipp Reisner * unconditionally add to the ee_hash. 1707b411b363SPhilipp Reisner * 1708b411b363SPhilipp Reisner * if no conflicting request is found: 1709b411b363SPhilipp Reisner * submit. 1710b411b363SPhilipp Reisner * 1711b411b363SPhilipp Reisner * if any conflicting request is found 1712b411b363SPhilipp Reisner * that has not yet been acked, 1713b411b363SPhilipp Reisner * AND I have the "discard concurrent writes" flag: 1714b411b363SPhilipp Reisner * queue (via done_ee) the P_DISCARD_ACK; OUT. 1715b411b363SPhilipp Reisner * 1716b411b363SPhilipp Reisner * if any conflicting request is found: 1717b411b363SPhilipp Reisner * block the receiver, waiting on misc_wait 1718b411b363SPhilipp Reisner * until no more conflicting requests are there, 1719b411b363SPhilipp Reisner * or we get interrupted (disconnect). 1720b411b363SPhilipp Reisner * 1721b411b363SPhilipp Reisner * we do not just write after local io completion of those 1722b411b363SPhilipp Reisner * requests, but only after req is done completely, i.e. 1723b411b363SPhilipp Reisner * we wait for the P_DISCARD_ACK to arrive! 1724b411b363SPhilipp Reisner * 1725b411b363SPhilipp Reisner * then proceed normally, i.e. submit. 1726b411b363SPhilipp Reisner */ 1727b411b363SPhilipp Reisner if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) 1728b411b363SPhilipp Reisner goto out_interrupted; 1729b411b363SPhilipp Reisner 1730b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1731b411b363SPhilipp Reisner 1732b411b363SPhilipp Reisner hlist_add_head(&e->colision, ee_hash_slot(mdev, sector)); 1733b411b363SPhilipp Reisner 1734b411b363SPhilipp Reisner #define OVERLAPS overlaps(i->sector, i->size, sector, size) 1735b411b363SPhilipp Reisner slot = tl_hash_slot(mdev, sector); 1736b411b363SPhilipp Reisner first = 1; 1737b411b363SPhilipp Reisner for (;;) { 1738b411b363SPhilipp Reisner int have_unacked = 0; 1739b411b363SPhilipp Reisner int have_conflict = 0; 1740b411b363SPhilipp Reisner prepare_to_wait(&mdev->misc_wait, &wait, 1741b411b363SPhilipp Reisner TASK_INTERRUPTIBLE); 1742b411b363SPhilipp Reisner hlist_for_each_entry(i, n, slot, colision) { 1743b411b363SPhilipp Reisner if (OVERLAPS) { 1744b411b363SPhilipp Reisner /* only ALERT on first iteration, 1745b411b363SPhilipp Reisner * we may be woken up early... */ 1746b411b363SPhilipp Reisner if (first) 1747b411b363SPhilipp Reisner dev_alert(DEV, "%s[%u] Concurrent local write detected!" 1748b411b363SPhilipp Reisner " new: %llus +%u; pending: %llus +%u\n", 1749b411b363SPhilipp Reisner current->comm, current->pid, 1750b411b363SPhilipp Reisner (unsigned long long)sector, size, 1751b411b363SPhilipp Reisner (unsigned long long)i->sector, i->size); 1752b411b363SPhilipp Reisner if (i->rq_state & RQ_NET_PENDING) 1753b411b363SPhilipp Reisner ++have_unacked; 1754b411b363SPhilipp Reisner ++have_conflict; 1755b411b363SPhilipp Reisner } 1756b411b363SPhilipp Reisner } 1757b411b363SPhilipp Reisner #undef OVERLAPS 1758b411b363SPhilipp Reisner if (!have_conflict) 1759b411b363SPhilipp Reisner break; 1760b411b363SPhilipp Reisner 1761b411b363SPhilipp Reisner /* Discard Ack only for the _first_ iteration */ 1762b411b363SPhilipp Reisner if (first && discard && have_unacked) { 1763b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", 1764b411b363SPhilipp Reisner (unsigned long long)sector); 1765b411b363SPhilipp Reisner inc_unacked(mdev); 1766b411b363SPhilipp Reisner e->w.cb = e_send_discard_ack; 1767b411b363SPhilipp Reisner list_add_tail(&e->w.list, &mdev->done_ee); 1768b411b363SPhilipp Reisner 1769b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1770b411b363SPhilipp Reisner 1771b411b363SPhilipp Reisner /* we could probably send that P_DISCARD_ACK ourselves, 1772b411b363SPhilipp Reisner * but I don't like the receiver using the msock */ 1773b411b363SPhilipp Reisner 1774b411b363SPhilipp Reisner put_ldev(mdev); 1775b411b363SPhilipp Reisner wake_asender(mdev); 1776b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1777b411b363SPhilipp Reisner return TRUE; 1778b411b363SPhilipp Reisner } 1779b411b363SPhilipp Reisner 1780b411b363SPhilipp Reisner if (signal_pending(current)) { 1781b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1782b411b363SPhilipp Reisner 1783b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1784b411b363SPhilipp Reisner 1785b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1786b411b363SPhilipp Reisner goto out_interrupted; 1787b411b363SPhilipp Reisner } 1788b411b363SPhilipp Reisner 1789b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1790b411b363SPhilipp Reisner if (first) { 1791b411b363SPhilipp Reisner first = 0; 1792b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " 1793b411b363SPhilipp Reisner "sec=%llus\n", (unsigned long long)sector); 1794b411b363SPhilipp Reisner } else if (discard) { 1795b411b363SPhilipp Reisner /* we had none on the first iteration. 1796b411b363SPhilipp Reisner * there must be none now. */ 1797b411b363SPhilipp Reisner D_ASSERT(have_unacked == 0); 1798b411b363SPhilipp Reisner } 1799b411b363SPhilipp Reisner schedule(); 1800b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1801b411b363SPhilipp Reisner } 1802b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1803b411b363SPhilipp Reisner } 1804b411b363SPhilipp Reisner 1805b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->active_ee); 1806b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1807b411b363SPhilipp Reisner 1808b411b363SPhilipp Reisner switch (mdev->net_conf->wire_protocol) { 1809b411b363SPhilipp Reisner case DRBD_PROT_C: 1810b411b363SPhilipp Reisner inc_unacked(mdev); 1811b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 1812b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1813b411b363SPhilipp Reisner break; 1814b411b363SPhilipp Reisner case DRBD_PROT_B: 1815b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 1816b411b363SPhilipp Reisner * sends on the msock, but anyways */ 1817b411b363SPhilipp Reisner drbd_send_ack(mdev, P_RECV_ACK, e); 1818b411b363SPhilipp Reisner break; 1819b411b363SPhilipp Reisner case DRBD_PROT_A: 1820b411b363SPhilipp Reisner /* nothing to do */ 1821b411b363SPhilipp Reisner break; 1822b411b363SPhilipp Reisner } 1823b411b363SPhilipp Reisner 18246719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 1825b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 1826b411b363SPhilipp Reisner drbd_set_out_of_sync(mdev, e->sector, e->size); 1827b411b363SPhilipp Reisner e->flags |= EE_CALL_AL_COMPLETE_IO; 18286719fb03SLars Ellenberg e->flags &= ~EE_MAY_SET_IN_SYNC; 1829b411b363SPhilipp Reisner drbd_al_begin_io(mdev, e->sector); 1830b411b363SPhilipp Reisner } 1831b411b363SPhilipp Reisner 183245bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0) 1833b411b363SPhilipp Reisner return TRUE; 1834b411b363SPhilipp Reisner 183522cc37a9SLars Ellenberg /* drbd_submit_ee currently fails for one reason only: 183622cc37a9SLars Ellenberg * not being able to allocate enough bios. 183722cc37a9SLars Ellenberg * Is dropping the connection going to help? */ 183822cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 183922cc37a9SLars Ellenberg list_del(&e->w.list); 184022cc37a9SLars Ellenberg hlist_del_init(&e->colision); 184122cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 184222cc37a9SLars Ellenberg if (e->flags & EE_CALL_AL_COMPLETE_IO) 184322cc37a9SLars Ellenberg drbd_al_complete_io(mdev, e->sector); 184422cc37a9SLars Ellenberg 1845b411b363SPhilipp Reisner out_interrupted: 1846b411b363SPhilipp Reisner /* yes, the epoch_size now is imbalanced. 1847b411b363SPhilipp Reisner * but we drop the connection anyways, so we don't have a chance to 1848b411b363SPhilipp Reisner * receive a barrier... atomic_inc(&mdev->epoch_size); */ 1849b411b363SPhilipp Reisner put_ldev(mdev); 1850b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1851b411b363SPhilipp Reisner return FALSE; 1852b411b363SPhilipp Reisner } 1853b411b363SPhilipp Reisner 18540f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 18550f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 18560f0601f4SLars Ellenberg * 18570f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 18580f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 18590f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 18600f0601f4SLars Ellenberg * activity, it obviously is "busy". 18610f0601f4SLars Ellenberg * 18620f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 18630f0601f4SLars Ellenberg * to have a short time average so we can react faster. 18640f0601f4SLars Ellenberg */ 1865e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 18660f0601f4SLars Ellenberg { 18670f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 18680f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 1869e3555d85SPhilipp Reisner struct lc_element *tmp; 18700f0601f4SLars Ellenberg int curr_events; 18710f0601f4SLars Ellenberg int throttle = 0; 18720f0601f4SLars Ellenberg 18730f0601f4SLars Ellenberg /* feature disabled? */ 18740f0601f4SLars Ellenberg if (mdev->sync_conf.c_min_rate == 0) 18750f0601f4SLars Ellenberg return 0; 18760f0601f4SLars Ellenberg 1877e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 1878e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 1879e3555d85SPhilipp Reisner if (tmp) { 1880e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 1881e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 1882e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1883e3555d85SPhilipp Reisner return 0; 1884e3555d85SPhilipp Reisner } 1885e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 1886e3555d85SPhilipp Reisner } 1887e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1888e3555d85SPhilipp Reisner 18890f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 18900f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 18910f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 1892e3555d85SPhilipp Reisner 18930f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 18940f0601f4SLars Ellenberg unsigned long rs_left; 18950f0601f4SLars Ellenberg int i; 18960f0601f4SLars Ellenberg 18970f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 18980f0601f4SLars Ellenberg 18990f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 19000f0601f4SLars Ellenberg * approx. */ 19012649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 19022649f080SLars Ellenberg 19032649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 19042649f080SLars Ellenberg rs_left = mdev->ov_left; 19052649f080SLars Ellenberg else 19060f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 19070f0601f4SLars Ellenberg 19080f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 19090f0601f4SLars Ellenberg if (!dt) 19100f0601f4SLars Ellenberg dt++; 19110f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 19120f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 19130f0601f4SLars Ellenberg 19140f0601f4SLars Ellenberg if (dbdt > mdev->sync_conf.c_min_rate) 19150f0601f4SLars Ellenberg throttle = 1; 19160f0601f4SLars Ellenberg } 19170f0601f4SLars Ellenberg return throttle; 19180f0601f4SLars Ellenberg } 19190f0601f4SLars Ellenberg 19200f0601f4SLars Ellenberg 192102918be2SPhilipp Reisner static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int digest_size) 1922b411b363SPhilipp Reisner { 1923b411b363SPhilipp Reisner sector_t sector; 1924b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1925b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1926b411b363SPhilipp Reisner struct digest_info *di = NULL; 1927b18b37beSPhilipp Reisner int size, verb; 1928b411b363SPhilipp Reisner unsigned int fault_type; 192902918be2SPhilipp Reisner struct p_block_req *p = &mdev->data.rbuf.block_req; 1930b411b363SPhilipp Reisner 1931b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1932b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 1933b411b363SPhilipp Reisner 19341816a2b4SLars Ellenberg if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) { 1935b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 1936b411b363SPhilipp Reisner (unsigned long long)sector, size); 1937b411b363SPhilipp Reisner return FALSE; 1938b411b363SPhilipp Reisner } 1939b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 1940b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 1941b411b363SPhilipp Reisner (unsigned long long)sector, size); 1942b411b363SPhilipp Reisner return FALSE; 1943b411b363SPhilipp Reisner } 1944b411b363SPhilipp Reisner 1945b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 1946b18b37beSPhilipp Reisner verb = 1; 1947b18b37beSPhilipp Reisner switch (cmd) { 1948b18b37beSPhilipp Reisner case P_DATA_REQUEST: 1949b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 1950b18b37beSPhilipp Reisner break; 1951b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 1952b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 1953b18b37beSPhilipp Reisner case P_OV_REQUEST: 1954b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 1955b18b37beSPhilipp Reisner break; 1956b18b37beSPhilipp Reisner case P_OV_REPLY: 1957b18b37beSPhilipp Reisner verb = 0; 1958b18b37beSPhilipp Reisner dec_rs_pending(mdev); 1959b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 1960b18b37beSPhilipp Reisner break; 1961b18b37beSPhilipp Reisner default: 1962b18b37beSPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 1963b18b37beSPhilipp Reisner cmdname(cmd)); 1964b18b37beSPhilipp Reisner } 1965b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 1966b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 1967b411b363SPhilipp Reisner "no local data.\n"); 1968b18b37beSPhilipp Reisner 1969a821cc4aSLars Ellenberg /* drain possibly payload */ 1970a821cc4aSLars Ellenberg return drbd_drain_block(mdev, digest_size); 1971b411b363SPhilipp Reisner } 1972b411b363SPhilipp Reisner 1973b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1974b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1975b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1976b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); 1977b411b363SPhilipp Reisner if (!e) { 1978b411b363SPhilipp Reisner put_ldev(mdev); 1979b411b363SPhilipp Reisner return FALSE; 1980b411b363SPhilipp Reisner } 1981b411b363SPhilipp Reisner 198202918be2SPhilipp Reisner switch (cmd) { 1983b411b363SPhilipp Reisner case P_DATA_REQUEST: 1984b411b363SPhilipp Reisner e->w.cb = w_e_end_data_req; 1985b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 198680a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 198780a40e43SLars Ellenberg goto submit; 198880a40e43SLars Ellenberg 1989b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 1990b411b363SPhilipp Reisner e->w.cb = w_e_end_rsdata_req; 1991b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 19925f9915bbSLars Ellenberg /* used in the sector offset progress display */ 19935f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 1994b411b363SPhilipp Reisner break; 1995b411b363SPhilipp Reisner 1996b411b363SPhilipp Reisner case P_OV_REPLY: 1997b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 1998b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 1999b411b363SPhilipp Reisner di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); 2000b411b363SPhilipp Reisner if (!di) 2001b411b363SPhilipp Reisner goto out_free_e; 2002b411b363SPhilipp Reisner 2003b411b363SPhilipp Reisner di->digest_size = digest_size; 2004b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2005b411b363SPhilipp Reisner 2006c36c3cedSLars Ellenberg e->digest = di; 2007c36c3cedSLars Ellenberg e->flags |= EE_HAS_DIGEST; 2008c36c3cedSLars Ellenberg 2009b411b363SPhilipp Reisner if (drbd_recv(mdev, di->digest, digest_size) != digest_size) 2010b411b363SPhilipp Reisner goto out_free_e; 2011b411b363SPhilipp Reisner 201202918be2SPhilipp Reisner if (cmd == P_CSUM_RS_REQUEST) { 2013b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 2014b411b363SPhilipp Reisner e->w.cb = w_e_end_csum_rs_req; 20155f9915bbSLars Ellenberg /* used in the sector offset progress display */ 20165f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 201702918be2SPhilipp Reisner } else if (cmd == P_OV_REPLY) { 20182649f080SLars Ellenberg /* track progress, we may need to throttle */ 20192649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2020b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_reply; 2021b411b363SPhilipp Reisner dec_rs_pending(mdev); 20220f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 20230f0601f4SLars Ellenberg * but accounting still needs to be done. */ 20240f0601f4SLars Ellenberg goto submit_for_resync; 2025b411b363SPhilipp Reisner } 2026b411b363SPhilipp Reisner break; 2027b411b363SPhilipp Reisner 2028b411b363SPhilipp Reisner case P_OV_REQUEST: 2029b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 2030b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90) { 2031de228bbaSLars Ellenberg unsigned long now = jiffies; 2032de228bbaSLars Ellenberg int i; 2033b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2034b411b363SPhilipp Reisner mdev->ov_position = sector; 203530b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 203630b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2037de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2038de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2039de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2040de228bbaSLars Ellenberg } 2041b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2042b411b363SPhilipp Reisner (unsigned long long)sector); 2043b411b363SPhilipp Reisner } 2044b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_req; 2045b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2046b411b363SPhilipp Reisner break; 2047b411b363SPhilipp Reisner 2048b411b363SPhilipp Reisner default: 2049b411b363SPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 205002918be2SPhilipp Reisner cmdname(cmd)); 2051b411b363SPhilipp Reisner fault_type = DRBD_FAULT_MAX; 205280a40e43SLars Ellenberg goto out_free_e; 2053b411b363SPhilipp Reisner } 2054b411b363SPhilipp Reisner 20550f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 20560f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 20570f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 20580f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 20590f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 20600f0601f4SLars Ellenberg * 20610f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 20620f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 20630f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 20640f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 20650f0601f4SLars Ellenberg * a while, anyways. 20660f0601f4SLars Ellenberg */ 2067b411b363SPhilipp Reisner 20680f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 20690f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 20700f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 20710f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 20720f0601f4SLars Ellenberg * 20730f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 20740f0601f4SLars Ellenberg * we would also throttle its application reads. 20750f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 20760f0601f4SLars Ellenberg */ 2077e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2078e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2079e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 208080a40e43SLars Ellenberg goto out_free_e; 2081b411b363SPhilipp Reisner 20820f0601f4SLars Ellenberg submit_for_resync: 20830f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 20840f0601f4SLars Ellenberg 208580a40e43SLars Ellenberg submit: 2086b411b363SPhilipp Reisner inc_unacked(mdev); 208780a40e43SLars Ellenberg spin_lock_irq(&mdev->req_lock); 208880a40e43SLars Ellenberg list_add_tail(&e->w.list, &mdev->read_ee); 208980a40e43SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 2090b411b363SPhilipp Reisner 209145bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, READ, fault_type) == 0) 2092b411b363SPhilipp Reisner return TRUE; 2093b411b363SPhilipp Reisner 209422cc37a9SLars Ellenberg /* drbd_submit_ee currently fails for one reason only: 209522cc37a9SLars Ellenberg * not being able to allocate enough bios. 209622cc37a9SLars Ellenberg * Is dropping the connection going to help? */ 209722cc37a9SLars Ellenberg spin_lock_irq(&mdev->req_lock); 209822cc37a9SLars Ellenberg list_del(&e->w.list); 209922cc37a9SLars Ellenberg spin_unlock_irq(&mdev->req_lock); 210022cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 210122cc37a9SLars Ellenberg 2102b411b363SPhilipp Reisner out_free_e: 2103b411b363SPhilipp Reisner put_ldev(mdev); 2104b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 2105b411b363SPhilipp Reisner return FALSE; 2106b411b363SPhilipp Reisner } 2107b411b363SPhilipp Reisner 2108b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2109b411b363SPhilipp Reisner { 2110b411b363SPhilipp Reisner int self, peer, rv = -100; 2111b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 2112b411b363SPhilipp Reisner 2113b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2114b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2115b411b363SPhilipp Reisner 2116b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2117b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2118b411b363SPhilipp Reisner 2119b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_0p) { 2120b411b363SPhilipp Reisner case ASB_CONSENSUS: 2121b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2122b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2123b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2124b411b363SPhilipp Reisner break; 2125b411b363SPhilipp Reisner case ASB_DISCONNECT: 2126b411b363SPhilipp Reisner break; 2127b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2128b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2129b411b363SPhilipp Reisner rv = -1; 2130b411b363SPhilipp Reisner break; 2131b411b363SPhilipp Reisner } 2132b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2133b411b363SPhilipp Reisner rv = 1; 2134b411b363SPhilipp Reisner break; 2135b411b363SPhilipp Reisner } 2136b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2137b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2138b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2139b411b363SPhilipp Reisner rv = 1; 2140b411b363SPhilipp Reisner break; 2141b411b363SPhilipp Reisner } 2142b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2143b411b363SPhilipp Reisner rv = -1; 2144b411b363SPhilipp Reisner break; 2145b411b363SPhilipp Reisner } 2146b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2147ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2148b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2149b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2150b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 2151b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2152b411b363SPhilipp Reisner ? -1 : 1; 2153b411b363SPhilipp Reisner break; 2154b411b363SPhilipp Reisner } else { 2155b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2156b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2157b411b363SPhilipp Reisner } 2158b411b363SPhilipp Reisner if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) 2159b411b363SPhilipp Reisner break; 2160b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2161b411b363SPhilipp Reisner if (ch_self < ch_peer) 2162b411b363SPhilipp Reisner rv = -1; 2163b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2164b411b363SPhilipp Reisner rv = 1; 2165b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2166b411b363SPhilipp Reisner /* Well, then use something else. */ 2167b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2168b411b363SPhilipp Reisner ? -1 : 1; 2169b411b363SPhilipp Reisner break; 2170b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2171b411b363SPhilipp Reisner rv = -1; 2172b411b363SPhilipp Reisner break; 2173b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2174b411b363SPhilipp Reisner rv = 1; 2175b411b363SPhilipp Reisner } 2176b411b363SPhilipp Reisner 2177b411b363SPhilipp Reisner return rv; 2178b411b363SPhilipp Reisner } 2179b411b363SPhilipp Reisner 2180b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2181b411b363SPhilipp Reisner { 2182b411b363SPhilipp Reisner int self, peer, hg, rv = -100; 2183b411b363SPhilipp Reisner 2184b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2185b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2186b411b363SPhilipp Reisner 2187b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_1p) { 2188b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2189b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2190b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2191b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2192b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2193b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2194b411b363SPhilipp Reisner break; 2195b411b363SPhilipp Reisner case ASB_DISCONNECT: 2196b411b363SPhilipp Reisner break; 2197b411b363SPhilipp Reisner case ASB_CONSENSUS: 2198b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2199b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2200b411b363SPhilipp Reisner rv = hg; 2201b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2202b411b363SPhilipp Reisner rv = hg; 2203b411b363SPhilipp Reisner break; 2204b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2205b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2206b411b363SPhilipp Reisner break; 2207b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2208b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2209b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2210b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2211b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2212b411b363SPhilipp Reisner self = drbd_set_role(mdev, R_SECONDARY, 0); 2213b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2214b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2215b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2216b411b363SPhilipp Reisner self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2217b411b363SPhilipp Reisner if (self != SS_SUCCESS) { 2218b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2219b411b363SPhilipp Reisner } else { 2220b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2221b411b363SPhilipp Reisner rv = hg; 2222b411b363SPhilipp Reisner } 2223b411b363SPhilipp Reisner } else 2224b411b363SPhilipp Reisner rv = hg; 2225b411b363SPhilipp Reisner } 2226b411b363SPhilipp Reisner 2227b411b363SPhilipp Reisner return rv; 2228b411b363SPhilipp Reisner } 2229b411b363SPhilipp Reisner 2230b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2231b411b363SPhilipp Reisner { 2232b411b363SPhilipp Reisner int self, peer, hg, rv = -100; 2233b411b363SPhilipp Reisner 2234b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2235b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2236b411b363SPhilipp Reisner 2237b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_2p) { 2238b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2239b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2240b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2241b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2242b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2243b411b363SPhilipp Reisner case ASB_CONSENSUS: 2244b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2245b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2246b411b363SPhilipp Reisner break; 2247b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2248b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2249b411b363SPhilipp Reisner break; 2250b411b363SPhilipp Reisner case ASB_DISCONNECT: 2251b411b363SPhilipp Reisner break; 2252b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2253b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2254b411b363SPhilipp Reisner if (hg == -1) { 2255b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2256b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2257b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2258b411b363SPhilipp Reisner self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2259b411b363SPhilipp Reisner if (self != SS_SUCCESS) { 2260b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2261b411b363SPhilipp Reisner } else { 2262b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2263b411b363SPhilipp Reisner rv = hg; 2264b411b363SPhilipp Reisner } 2265b411b363SPhilipp Reisner } else 2266b411b363SPhilipp Reisner rv = hg; 2267b411b363SPhilipp Reisner } 2268b411b363SPhilipp Reisner 2269b411b363SPhilipp Reisner return rv; 2270b411b363SPhilipp Reisner } 2271b411b363SPhilipp Reisner 2272b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2273b411b363SPhilipp Reisner u64 bits, u64 flags) 2274b411b363SPhilipp Reisner { 2275b411b363SPhilipp Reisner if (!uuid) { 2276b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2277b411b363SPhilipp Reisner return; 2278b411b363SPhilipp Reisner } 2279b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2280b411b363SPhilipp Reisner text, 2281b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2282b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2283b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2284b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2285b411b363SPhilipp Reisner (unsigned long long)bits, 2286b411b363SPhilipp Reisner (unsigned long long)flags); 2287b411b363SPhilipp Reisner } 2288b411b363SPhilipp Reisner 2289b411b363SPhilipp Reisner /* 2290b411b363SPhilipp Reisner 100 after split brain try auto recover 2291b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2292b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2293b411b363SPhilipp Reisner 0 no Sync 2294b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2295b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2296b411b363SPhilipp Reisner -100 after split brain, disconnect 2297b411b363SPhilipp Reisner -1000 unrelated data 2298b411b363SPhilipp Reisner */ 2299b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2300b411b363SPhilipp Reisner { 2301b411b363SPhilipp Reisner u64 self, peer; 2302b411b363SPhilipp Reisner int i, j; 2303b411b363SPhilipp Reisner 2304b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2305b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2306b411b363SPhilipp Reisner 2307b411b363SPhilipp Reisner *rule_nr = 10; 2308b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2309b411b363SPhilipp Reisner return 0; 2310b411b363SPhilipp Reisner 2311b411b363SPhilipp Reisner *rule_nr = 20; 2312b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2313b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2314b411b363SPhilipp Reisner return -2; 2315b411b363SPhilipp Reisner 2316b411b363SPhilipp Reisner *rule_nr = 30; 2317b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2318b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2319b411b363SPhilipp Reisner return 2; 2320b411b363SPhilipp Reisner 2321b411b363SPhilipp Reisner if (self == peer) { 2322b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2323b411b363SPhilipp Reisner 2324b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2325b411b363SPhilipp Reisner 2326b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2327b411b363SPhilipp Reisner return -1001; 2328b411b363SPhilipp Reisner 2329b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2330b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2331b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2332b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2333b411b363SPhilipp Reisner 2334b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2335b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2336b411b363SPhilipp Reisner *rule_nr = 34; 2337b411b363SPhilipp Reisner } else { 2338b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2339b411b363SPhilipp Reisner *rule_nr = 36; 2340b411b363SPhilipp Reisner } 2341b411b363SPhilipp Reisner 2342b411b363SPhilipp Reisner return 1; 2343b411b363SPhilipp Reisner } 2344b411b363SPhilipp Reisner 2345b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2346b411b363SPhilipp Reisner 2347b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2348b411b363SPhilipp Reisner return -1001; 2349b411b363SPhilipp Reisner 2350b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2351b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2352b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2353b411b363SPhilipp Reisner 2354b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2355b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2356b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2357b411b363SPhilipp Reisner 2358b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2359b411b363SPhilipp Reisner *rule_nr = 35; 2360b411b363SPhilipp Reisner } else { 2361b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2362b411b363SPhilipp Reisner *rule_nr = 37; 2363b411b363SPhilipp Reisner } 2364b411b363SPhilipp Reisner 2365b411b363SPhilipp Reisner return -1; 2366b411b363SPhilipp Reisner } 2367b411b363SPhilipp Reisner 2368b411b363SPhilipp Reisner /* Common power [off|failure] */ 2369b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2370b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2371b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2372b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2373b411b363SPhilipp Reisner *rule_nr = 40; 2374b411b363SPhilipp Reisner 2375b411b363SPhilipp Reisner switch (rct) { 2376b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2377b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2378b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2379b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 2380b411b363SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->flags); 2381b411b363SPhilipp Reisner return dc ? -1 : 1; 2382b411b363SPhilipp Reisner } 2383b411b363SPhilipp Reisner } 2384b411b363SPhilipp Reisner 2385b411b363SPhilipp Reisner *rule_nr = 50; 2386b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2387b411b363SPhilipp Reisner if (self == peer) 2388b411b363SPhilipp Reisner return -1; 2389b411b363SPhilipp Reisner 2390b411b363SPhilipp Reisner *rule_nr = 51; 2391b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2392b411b363SPhilipp Reisner if (self == peer) { 2393b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2394b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1); 2395b411b363SPhilipp Reisner if (self == peer) { 2396b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2397b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2398b411b363SPhilipp Reisner 2399b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2400b411b363SPhilipp Reisner return -1001; 2401b411b363SPhilipp Reisner 2402b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2403b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 2404b411b363SPhilipp Reisner return -1; 2405b411b363SPhilipp Reisner } 2406b411b363SPhilipp Reisner } 2407b411b363SPhilipp Reisner 2408b411b363SPhilipp Reisner *rule_nr = 60; 2409b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2410b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2411b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2412b411b363SPhilipp Reisner if (self == peer) 2413b411b363SPhilipp Reisner return -2; 2414b411b363SPhilipp Reisner } 2415b411b363SPhilipp Reisner 2416b411b363SPhilipp Reisner *rule_nr = 70; 2417b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2418b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2419b411b363SPhilipp Reisner if (self == peer) 2420b411b363SPhilipp Reisner return 1; 2421b411b363SPhilipp Reisner 2422b411b363SPhilipp Reisner *rule_nr = 71; 2423b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2424b411b363SPhilipp Reisner if (self == peer) { 2425b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1); 2426b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2427b411b363SPhilipp Reisner if (self == peer) { 2428b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2429b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2430b411b363SPhilipp Reisner 2431b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2432b411b363SPhilipp Reisner return -1001; 2433b411b363SPhilipp Reisner 2434b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2435b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2436b411b363SPhilipp Reisner 2437b411b363SPhilipp Reisner dev_info(DEV, "Undid last start of resync:\n"); 2438b411b363SPhilipp Reisner 2439b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2440b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2441b411b363SPhilipp Reisner 2442b411b363SPhilipp Reisner return 1; 2443b411b363SPhilipp Reisner } 2444b411b363SPhilipp Reisner } 2445b411b363SPhilipp Reisner 2446b411b363SPhilipp Reisner 2447b411b363SPhilipp Reisner *rule_nr = 80; 2448d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2449b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2450b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2451b411b363SPhilipp Reisner if (self == peer) 2452b411b363SPhilipp Reisner return 2; 2453b411b363SPhilipp Reisner } 2454b411b363SPhilipp Reisner 2455b411b363SPhilipp Reisner *rule_nr = 90; 2456b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2457b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2458b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2459b411b363SPhilipp Reisner return 100; 2460b411b363SPhilipp Reisner 2461b411b363SPhilipp Reisner *rule_nr = 100; 2462b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2463b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2464b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2465b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2466b411b363SPhilipp Reisner if (self == peer) 2467b411b363SPhilipp Reisner return -100; 2468b411b363SPhilipp Reisner } 2469b411b363SPhilipp Reisner } 2470b411b363SPhilipp Reisner 2471b411b363SPhilipp Reisner return -1000; 2472b411b363SPhilipp Reisner } 2473b411b363SPhilipp Reisner 2474b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2475b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2476b411b363SPhilipp Reisner */ 2477b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2478b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2479b411b363SPhilipp Reisner { 2480b411b363SPhilipp Reisner int hg, rule_nr; 2481b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2482b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 2483b411b363SPhilipp Reisner 2484b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2485b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2486b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2487b411b363SPhilipp Reisner 2488b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2489b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2490b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2491b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2492b411b363SPhilipp Reisner 2493b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2494b411b363SPhilipp Reisner 2495b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2496b411b363SPhilipp Reisner 2497b411b363SPhilipp Reisner if (hg == -1000) { 2498b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2499b411b363SPhilipp Reisner return C_MASK; 2500b411b363SPhilipp Reisner } 2501b411b363SPhilipp Reisner if (hg == -1001) { 2502b411b363SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol\n"); 2503b411b363SPhilipp Reisner return C_MASK; 2504b411b363SPhilipp Reisner } 2505b411b363SPhilipp Reisner 2506b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2507b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2508b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2509b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2510b411b363SPhilipp Reisner if (f) 2511b411b363SPhilipp Reisner hg = hg*2; 2512b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2513b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2514b411b363SPhilipp Reisner } 2515b411b363SPhilipp Reisner 25163a11a487SAdam Gandelman if (abs(hg) == 100) 25173a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 25183a11a487SAdam Gandelman 2519b411b363SPhilipp Reisner if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) { 2520b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2521b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2522b411b363SPhilipp Reisner int forced = (hg == -100); 2523b411b363SPhilipp Reisner 2524b411b363SPhilipp Reisner switch (pcount) { 2525b411b363SPhilipp Reisner case 0: 2526b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2527b411b363SPhilipp Reisner break; 2528b411b363SPhilipp Reisner case 1: 2529b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2530b411b363SPhilipp Reisner break; 2531b411b363SPhilipp Reisner case 2: 2532b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2533b411b363SPhilipp Reisner break; 2534b411b363SPhilipp Reisner } 2535b411b363SPhilipp Reisner if (abs(hg) < 100) { 2536b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2537b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2538b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2539b411b363SPhilipp Reisner if (forced) { 2540b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2541b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2542b411b363SPhilipp Reisner hg = hg*2; 2543b411b363SPhilipp Reisner } 2544b411b363SPhilipp Reisner } 2545b411b363SPhilipp Reisner } 2546b411b363SPhilipp Reisner 2547b411b363SPhilipp Reisner if (hg == -100) { 2548b411b363SPhilipp Reisner if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2549b411b363SPhilipp Reisner hg = -1; 2550b411b363SPhilipp Reisner if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2551b411b363SPhilipp Reisner hg = 1; 2552b411b363SPhilipp Reisner 2553b411b363SPhilipp Reisner if (abs(hg) < 100) 2554b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2555b411b363SPhilipp Reisner "Sync from %s node\n", 2556b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2557b411b363SPhilipp Reisner } 2558b411b363SPhilipp Reisner 2559b411b363SPhilipp Reisner if (hg == -100) { 2560580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2561580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2562580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2563580b9767SLars Ellenberg * to that disk, in a way... */ 25643a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2565b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2566b411b363SPhilipp Reisner return C_MASK; 2567b411b363SPhilipp Reisner } 2568b411b363SPhilipp Reisner 2569b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2570b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2571b411b363SPhilipp Reisner return C_MASK; 2572b411b363SPhilipp Reisner } 2573b411b363SPhilipp Reisner 2574b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2575b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 2576b411b363SPhilipp Reisner switch (mdev->net_conf->rr_conflict) { 2577b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2578b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2579b411b363SPhilipp Reisner /* fall through */ 2580b411b363SPhilipp Reisner case ASB_DISCONNECT: 2581b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2582b411b363SPhilipp Reisner return C_MASK; 2583b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2584b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2585b411b363SPhilipp Reisner "assumption\n"); 2586b411b363SPhilipp Reisner } 2587b411b363SPhilipp Reisner } 2588b411b363SPhilipp Reisner 2589cf14c2e9SPhilipp Reisner if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { 2590cf14c2e9SPhilipp Reisner if (hg == 0) 2591cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2592cf14c2e9SPhilipp Reisner else 2593cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2594cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2595cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2596cf14c2e9SPhilipp Reisner return C_MASK; 2597cf14c2e9SPhilipp Reisner } 2598cf14c2e9SPhilipp Reisner 2599b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2600b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 2601b411b363SPhilipp Reisner if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake")) 2602b411b363SPhilipp Reisner return C_MASK; 2603b411b363SPhilipp Reisner } 2604b411b363SPhilipp Reisner 2605b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2606b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2607b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2608b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2609b411b363SPhilipp Reisner } else { 2610b411b363SPhilipp Reisner rv = C_CONNECTED; 2611b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2612b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2613b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2614b411b363SPhilipp Reisner } 2615b411b363SPhilipp Reisner } 2616b411b363SPhilipp Reisner 2617b411b363SPhilipp Reisner return rv; 2618b411b363SPhilipp Reisner } 2619b411b363SPhilipp Reisner 2620b411b363SPhilipp Reisner /* returns 1 if invalid */ 2621b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2622b411b363SPhilipp Reisner { 2623b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2624b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2625b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2626b411b363SPhilipp Reisner return 0; 2627b411b363SPhilipp Reisner 2628b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2629b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2630b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2631b411b363SPhilipp Reisner return 1; 2632b411b363SPhilipp Reisner 2633b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2634b411b363SPhilipp Reisner if (peer == self) 2635b411b363SPhilipp Reisner return 0; 2636b411b363SPhilipp Reisner 2637b411b363SPhilipp Reisner /* everything es is invalid. */ 2638b411b363SPhilipp Reisner return 1; 2639b411b363SPhilipp Reisner } 2640b411b363SPhilipp Reisner 264102918be2SPhilipp Reisner static int receive_protocol(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 2642b411b363SPhilipp Reisner { 264302918be2SPhilipp Reisner struct p_protocol *p = &mdev->data.rbuf.protocol; 2644b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2645cf14c2e9SPhilipp Reisner int p_want_lose, p_two_primaries, cf; 2646b411b363SPhilipp Reisner char p_integrity_alg[SHARED_SECRET_MAX] = ""; 2647b411b363SPhilipp Reisner 2648b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2649b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 2650b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 2651b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 2652b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 2653cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 2654cf14c2e9SPhilipp Reisner p_want_lose = cf & CF_WANT_LOSE; 2655cf14c2e9SPhilipp Reisner 2656cf14c2e9SPhilipp Reisner clear_bit(CONN_DRY_RUN, &mdev->flags); 2657cf14c2e9SPhilipp Reisner 2658cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 2659cf14c2e9SPhilipp Reisner set_bit(CONN_DRY_RUN, &mdev->flags); 2660b411b363SPhilipp Reisner 2661b411b363SPhilipp Reisner if (p_proto != mdev->net_conf->wire_protocol) { 2662b411b363SPhilipp Reisner dev_err(DEV, "incompatible communication protocols\n"); 2663b411b363SPhilipp Reisner goto disconnect; 2664b411b363SPhilipp Reisner } 2665b411b363SPhilipp Reisner 2666b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) { 2667b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-0pri settings\n"); 2668b411b363SPhilipp Reisner goto disconnect; 2669b411b363SPhilipp Reisner } 2670b411b363SPhilipp Reisner 2671b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) { 2672b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-1pri settings\n"); 2673b411b363SPhilipp Reisner goto disconnect; 2674b411b363SPhilipp Reisner } 2675b411b363SPhilipp Reisner 2676b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) { 2677b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-2pri settings\n"); 2678b411b363SPhilipp Reisner goto disconnect; 2679b411b363SPhilipp Reisner } 2680b411b363SPhilipp Reisner 2681b411b363SPhilipp Reisner if (p_want_lose && mdev->net_conf->want_lose) { 2682b411b363SPhilipp Reisner dev_err(DEV, "both sides have the 'want_lose' flag set\n"); 2683b411b363SPhilipp Reisner goto disconnect; 2684b411b363SPhilipp Reisner } 2685b411b363SPhilipp Reisner 2686b411b363SPhilipp Reisner if (p_two_primaries != mdev->net_conf->two_primaries) { 2687b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the two-primaries options\n"); 2688b411b363SPhilipp Reisner goto disconnect; 2689b411b363SPhilipp Reisner } 2690b411b363SPhilipp Reisner 2691b411b363SPhilipp Reisner if (mdev->agreed_pro_version >= 87) { 2692b411b363SPhilipp Reisner unsigned char *my_alg = mdev->net_conf->integrity_alg; 2693b411b363SPhilipp Reisner 2694b411b363SPhilipp Reisner if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) 2695b411b363SPhilipp Reisner return FALSE; 2696b411b363SPhilipp Reisner 2697b411b363SPhilipp Reisner p_integrity_alg[SHARED_SECRET_MAX-1] = 0; 2698b411b363SPhilipp Reisner if (strcmp(p_integrity_alg, my_alg)) { 2699b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); 2700b411b363SPhilipp Reisner goto disconnect; 2701b411b363SPhilipp Reisner } 2702b411b363SPhilipp Reisner dev_info(DEV, "data-integrity-alg: %s\n", 2703b411b363SPhilipp Reisner my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); 2704b411b363SPhilipp Reisner } 2705b411b363SPhilipp Reisner 2706b411b363SPhilipp Reisner return TRUE; 2707b411b363SPhilipp Reisner 2708b411b363SPhilipp Reisner disconnect: 2709b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2710b411b363SPhilipp Reisner return FALSE; 2711b411b363SPhilipp Reisner } 2712b411b363SPhilipp Reisner 2713b411b363SPhilipp Reisner /* helper function 2714b411b363SPhilipp Reisner * input: alg name, feature name 2715b411b363SPhilipp Reisner * return: NULL (alg name was "") 2716b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 2717b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 2718b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 2719b411b363SPhilipp Reisner const char *alg, const char *name) 2720b411b363SPhilipp Reisner { 2721b411b363SPhilipp Reisner struct crypto_hash *tfm; 2722b411b363SPhilipp Reisner 2723b411b363SPhilipp Reisner if (!alg[0]) 2724b411b363SPhilipp Reisner return NULL; 2725b411b363SPhilipp Reisner 2726b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 2727b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 2728b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 2729b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 2730b411b363SPhilipp Reisner return tfm; 2731b411b363SPhilipp Reisner } 2732b411b363SPhilipp Reisner if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 2733b411b363SPhilipp Reisner crypto_free_hash(tfm); 2734b411b363SPhilipp Reisner dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); 2735b411b363SPhilipp Reisner return ERR_PTR(-EINVAL); 2736b411b363SPhilipp Reisner } 2737b411b363SPhilipp Reisner return tfm; 2738b411b363SPhilipp Reisner } 2739b411b363SPhilipp Reisner 274002918be2SPhilipp Reisner static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int packet_size) 2741b411b363SPhilipp Reisner { 2742b411b363SPhilipp Reisner int ok = TRUE; 274302918be2SPhilipp Reisner struct p_rs_param_95 *p = &mdev->data.rbuf.rs_param_95; 2744b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 2745b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 2746b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 2747b411b363SPhilipp Reisner const int apv = mdev->agreed_pro_version; 2748778f271dSPhilipp Reisner int *rs_plan_s = NULL; 2749778f271dSPhilipp Reisner int fifo_size = 0; 2750b411b363SPhilipp Reisner 2751b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 2752b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 2753b411b363SPhilipp Reisner + SHARED_SECRET_MAX 27548e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 27558e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 2756b411b363SPhilipp Reisner 275702918be2SPhilipp Reisner if (packet_size > exp_max_sz) { 2758b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 275902918be2SPhilipp Reisner packet_size, exp_max_sz); 2760b411b363SPhilipp Reisner return FALSE; 2761b411b363SPhilipp Reisner } 2762b411b363SPhilipp Reisner 2763b411b363SPhilipp Reisner if (apv <= 88) { 276402918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param) - sizeof(struct p_header80); 276502918be2SPhilipp Reisner data_size = packet_size - header_size; 27668e26f9ccSPhilipp Reisner } else if (apv <= 94) { 276702918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header80); 276802918be2SPhilipp Reisner data_size = packet_size - header_size; 2769b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 27708e26f9ccSPhilipp Reisner } else { 277102918be2SPhilipp Reisner header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header80); 277202918be2SPhilipp Reisner data_size = packet_size - header_size; 2773b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 2774b411b363SPhilipp Reisner } 2775b411b363SPhilipp Reisner 2776b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 2777b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 2778b411b363SPhilipp Reisner 277902918be2SPhilipp Reisner if (drbd_recv(mdev, &p->head.payload, header_size) != header_size) 2780b411b363SPhilipp Reisner return FALSE; 2781b411b363SPhilipp Reisner 2782b411b363SPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 2783b411b363SPhilipp Reisner 2784b411b363SPhilipp Reisner if (apv >= 88) { 2785b411b363SPhilipp Reisner if (apv == 88) { 2786b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 2787b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 2788b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 2789b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 2790b411b363SPhilipp Reisner return FALSE; 2791b411b363SPhilipp Reisner } 2792b411b363SPhilipp Reisner 2793b411b363SPhilipp Reisner if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) 2794b411b363SPhilipp Reisner return FALSE; 2795b411b363SPhilipp Reisner 2796b411b363SPhilipp Reisner /* we expect NUL terminated string */ 2797b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2798b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 2799b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 2800b411b363SPhilipp Reisner 2801b411b363SPhilipp Reisner } else /* apv >= 89 */ { 2802b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 2803b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2804b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 2805b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 2806b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 2807b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 2808b411b363SPhilipp Reisner } 2809b411b363SPhilipp Reisner 2810b411b363SPhilipp Reisner if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { 2811b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2812b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 2813b411b363SPhilipp Reisner mdev->sync_conf.verify_alg, p->verify_alg); 2814b411b363SPhilipp Reisner goto disconnect; 2815b411b363SPhilipp Reisner } 2816b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 2817b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 2818b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 2819b411b363SPhilipp Reisner verify_tfm = NULL; 2820b411b363SPhilipp Reisner goto disconnect; 2821b411b363SPhilipp Reisner } 2822b411b363SPhilipp Reisner } 2823b411b363SPhilipp Reisner 2824b411b363SPhilipp Reisner if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { 2825b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2826b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 2827b411b363SPhilipp Reisner mdev->sync_conf.csums_alg, p->csums_alg); 2828b411b363SPhilipp Reisner goto disconnect; 2829b411b363SPhilipp Reisner } 2830b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 2831b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 2832b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 2833b411b363SPhilipp Reisner csums_tfm = NULL; 2834b411b363SPhilipp Reisner goto disconnect; 2835b411b363SPhilipp Reisner } 2836b411b363SPhilipp Reisner } 2837b411b363SPhilipp Reisner 28388e26f9ccSPhilipp Reisner if (apv > 94) { 28398e26f9ccSPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 28408e26f9ccSPhilipp Reisner mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 28418e26f9ccSPhilipp Reisner mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target); 28428e26f9ccSPhilipp Reisner mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target); 28438e26f9ccSPhilipp Reisner mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate); 2844778f271dSPhilipp Reisner 2845778f271dSPhilipp Reisner fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 2846778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 2847778f271dSPhilipp Reisner rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 2848778f271dSPhilipp Reisner if (!rs_plan_s) { 2849778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 2850778f271dSPhilipp Reisner goto disconnect; 2851778f271dSPhilipp Reisner } 2852778f271dSPhilipp Reisner } 28538e26f9ccSPhilipp Reisner } 2854b411b363SPhilipp Reisner 2855b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 2856b411b363SPhilipp Reisner /* lock against drbd_nl_syncer_conf() */ 2857b411b363SPhilipp Reisner if (verify_tfm) { 2858b411b363SPhilipp Reisner strcpy(mdev->sync_conf.verify_alg, p->verify_alg); 2859b411b363SPhilipp Reisner mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; 2860b411b363SPhilipp Reisner crypto_free_hash(mdev->verify_tfm); 2861b411b363SPhilipp Reisner mdev->verify_tfm = verify_tfm; 2862b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 2863b411b363SPhilipp Reisner } 2864b411b363SPhilipp Reisner if (csums_tfm) { 2865b411b363SPhilipp Reisner strcpy(mdev->sync_conf.csums_alg, p->csums_alg); 2866b411b363SPhilipp Reisner mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; 2867b411b363SPhilipp Reisner crypto_free_hash(mdev->csums_tfm); 2868b411b363SPhilipp Reisner mdev->csums_tfm = csums_tfm; 2869b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 2870b411b363SPhilipp Reisner } 2871778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size) { 2872778f271dSPhilipp Reisner kfree(mdev->rs_plan_s.values); 2873778f271dSPhilipp Reisner mdev->rs_plan_s.values = rs_plan_s; 2874778f271dSPhilipp Reisner mdev->rs_plan_s.size = fifo_size; 2875778f271dSPhilipp Reisner mdev->rs_planed = 0; 2876778f271dSPhilipp Reisner } 2877b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 2878b411b363SPhilipp Reisner } 2879b411b363SPhilipp Reisner 2880b411b363SPhilipp Reisner return ok; 2881b411b363SPhilipp Reisner disconnect: 2882b411b363SPhilipp Reisner /* just for completeness: actually not needed, 2883b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 2884b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 2885b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 2886b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 2887b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2888b411b363SPhilipp Reisner return FALSE; 2889b411b363SPhilipp Reisner } 2890b411b363SPhilipp Reisner 2891b411b363SPhilipp Reisner static void drbd_setup_order_type(struct drbd_conf *mdev, int peer) 2892b411b363SPhilipp Reisner { 2893b411b363SPhilipp Reisner /* sorry, we currently have no working implementation 2894b411b363SPhilipp Reisner * of distributed TCQ */ 2895b411b363SPhilipp Reisner } 2896b411b363SPhilipp Reisner 2897b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 2898b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 2899b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 2900b411b363SPhilipp Reisner { 2901b411b363SPhilipp Reisner sector_t d; 2902b411b363SPhilipp Reisner if (a == 0 || b == 0) 2903b411b363SPhilipp Reisner return; 2904b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 2905b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 2906b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 2907b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 2908b411b363SPhilipp Reisner } 2909b411b363SPhilipp Reisner 291002918be2SPhilipp Reisner static int receive_sizes(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 2911b411b363SPhilipp Reisner { 291202918be2SPhilipp Reisner struct p_sizes *p = &mdev->data.rbuf.sizes; 2913b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 29141816a2b4SLars Ellenberg unsigned int max_bio_size; 2915b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 2916b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 2917e89b591cSPhilipp Reisner enum dds_flags ddsf; 2918b411b363SPhilipp Reisner 2919b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 2920b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 2921b411b363SPhilipp Reisner 2922b411b363SPhilipp Reisner if (p_size == 0 && mdev->state.disk == D_DISKLESS) { 2923b411b363SPhilipp Reisner dev_err(DEV, "some backing storage is needed\n"); 2924b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2925b411b363SPhilipp Reisner return FALSE; 2926b411b363SPhilipp Reisner } 2927b411b363SPhilipp Reisner 2928b411b363SPhilipp Reisner /* just store the peer's disk size for now. 2929b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 2930b411b363SPhilipp Reisner mdev->p_size = p_size; 2931b411b363SPhilipp Reisner 2932b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2933b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 2934b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 2935b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 2936b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 2937b411b363SPhilipp Reisner 2938b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 2939b411b363SPhilipp Reisner * param exchange, choose the minimum */ 2940b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 2941b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 2942b411b363SPhilipp Reisner p_usize); 2943b411b363SPhilipp Reisner 2944b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 2945b411b363SPhilipp Reisner 2946b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 2947b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 2948b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 2949b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 2950b411b363SPhilipp Reisner } 2951b411b363SPhilipp Reisner 2952b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 2953b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 2954a393db6fSPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, 0) < 2955b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 2956b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 2957b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 2958b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 2959b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2960b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 2961b411b363SPhilipp Reisner put_ldev(mdev); 2962b411b363SPhilipp Reisner return FALSE; 2963b411b363SPhilipp Reisner } 2964b411b363SPhilipp Reisner put_ldev(mdev); 2965b411b363SPhilipp Reisner } 2966b411b363SPhilipp Reisner #undef min_not_zero 2967b411b363SPhilipp Reisner 2968e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 2969b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2970e89b591cSPhilipp Reisner dd = drbd_determin_dev_size(mdev, ddsf); 2971b411b363SPhilipp Reisner put_ldev(mdev); 2972b411b363SPhilipp Reisner if (dd == dev_size_error) 2973b411b363SPhilipp Reisner return FALSE; 2974b411b363SPhilipp Reisner drbd_md_sync(mdev); 2975b411b363SPhilipp Reisner } else { 2976b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 2977b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 2978b411b363SPhilipp Reisner } 2979b411b363SPhilipp Reisner 2980b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2981b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 2982b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 2983b411b363SPhilipp Reisner ldsc = 1; 2984b411b363SPhilipp Reisner } 2985b411b363SPhilipp Reisner 2986a1c88d0dSLars Ellenberg if (mdev->agreed_pro_version < 94) 29871816a2b4SLars Ellenberg max_bio_size = be32_to_cpu(p->max_bio_size); 29888979d9c9SLars Ellenberg else if (mdev->agreed_pro_version == 94) 29891816a2b4SLars Ellenberg max_bio_size = DRBD_MAX_SIZE_H80_PACKET; 2990a1c88d0dSLars Ellenberg else /* drbd 8.3.8 onwards */ 29911816a2b4SLars Ellenberg max_bio_size = DRBD_MAX_BIO_SIZE; 2992a1c88d0dSLars Ellenberg 29931816a2b4SLars Ellenberg if (max_bio_size != queue_max_hw_sectors(mdev->rq_queue) << 9) 29941816a2b4SLars Ellenberg drbd_setup_queue_param(mdev, max_bio_size); 2995b411b363SPhilipp Reisner 2996e89b591cSPhilipp Reisner drbd_setup_order_type(mdev, be16_to_cpu(p->queue_order_type)); 2997b411b363SPhilipp Reisner put_ldev(mdev); 2998b411b363SPhilipp Reisner } 2999b411b363SPhilipp Reisner 3000b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3001b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3002b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3003b411b363SPhilipp Reisner /* we have different sizes, probably peer 3004b411b363SPhilipp Reisner * needs to know my new size... */ 3005e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3006b411b363SPhilipp Reisner } 3007b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3008b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3009b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3010e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3011e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3012e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3013b411b363SPhilipp Reisner else 3014e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3015e89b591cSPhilipp Reisner } else 3016b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3017b411b363SPhilipp Reisner } 3018b411b363SPhilipp Reisner } 3019b411b363SPhilipp Reisner 3020b411b363SPhilipp Reisner return TRUE; 3021b411b363SPhilipp Reisner } 3022b411b363SPhilipp Reisner 302302918be2SPhilipp Reisner static int receive_uuids(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3024b411b363SPhilipp Reisner { 302502918be2SPhilipp Reisner struct p_uuids *p = &mdev->data.rbuf.uuids; 3026b411b363SPhilipp Reisner u64 *p_uuid; 3027b411b363SPhilipp Reisner int i; 3028b411b363SPhilipp Reisner 3029b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3030b411b363SPhilipp Reisner 3031b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3032b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3033b411b363SPhilipp Reisner 3034b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3035b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3036b411b363SPhilipp Reisner 3037b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3038b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3039b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3040b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3041b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3042b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 3043b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3044b411b363SPhilipp Reisner return FALSE; 3045b411b363SPhilipp Reisner } 3046b411b363SPhilipp Reisner 3047b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3048b411b363SPhilipp Reisner int skip_initial_sync = 3049b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 3050b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90 && 3051b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3052b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3053b411b363SPhilipp Reisner if (skip_initial_sync) { 3054b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3055b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 3056b411b363SPhilipp Reisner "clear_n_write from receive_uuids"); 3057b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3058b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3059b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3060b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3061b411b363SPhilipp Reisner drbd_md_sync(mdev); 3062b411b363SPhilipp Reisner } 3063b411b363SPhilipp Reisner put_ldev(mdev); 306418a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 306518a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 306618a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 306718a50fa2SPhilipp Reisner for me. */ 306818a50fa2SPhilipp Reisner drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3069b411b363SPhilipp Reisner } 3070b411b363SPhilipp Reisner 3071b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3072b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3073b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3074b411b363SPhilipp Reisner new disk state... */ 3075b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); 3076b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 3077b411b363SPhilipp Reisner drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3078b411b363SPhilipp Reisner 3079b411b363SPhilipp Reisner return TRUE; 3080b411b363SPhilipp Reisner } 3081b411b363SPhilipp Reisner 3082b411b363SPhilipp Reisner /** 3083b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3084b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3085b411b363SPhilipp Reisner */ 3086b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3087b411b363SPhilipp Reisner { 3088b411b363SPhilipp Reisner union drbd_state ms; 3089b411b363SPhilipp Reisner 3090b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3091b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3092b411b363SPhilipp Reisner 3093b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3094b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3095b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3096b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3097b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3098b411b363SPhilipp Reisner }; 3099b411b363SPhilipp Reisner 3100b411b363SPhilipp Reisner ms.i = ps.i; 3101b411b363SPhilipp Reisner 3102b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3103b411b363SPhilipp Reisner ms.peer = ps.role; 3104b411b363SPhilipp Reisner ms.role = ps.peer; 3105b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3106b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3107b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3108b411b363SPhilipp Reisner 3109b411b363SPhilipp Reisner return ms; 3110b411b363SPhilipp Reisner } 3111b411b363SPhilipp Reisner 311202918be2SPhilipp Reisner static int receive_req_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3113b411b363SPhilipp Reisner { 311402918be2SPhilipp Reisner struct p_req_state *p = &mdev->data.rbuf.req_state; 3115b411b363SPhilipp Reisner union drbd_state mask, val; 3116b411b363SPhilipp Reisner int rv; 3117b411b363SPhilipp Reisner 3118b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3119b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3120b411b363SPhilipp Reisner 3121b411b363SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->flags) && 3122b411b363SPhilipp Reisner test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { 3123b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 3124b411b363SPhilipp Reisner return TRUE; 3125b411b363SPhilipp Reisner } 3126b411b363SPhilipp Reisner 3127b411b363SPhilipp Reisner mask = convert_state(mask); 3128b411b363SPhilipp Reisner val = convert_state(val); 3129b411b363SPhilipp Reisner 3130b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3131b411b363SPhilipp Reisner 3132b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3133b411b363SPhilipp Reisner drbd_md_sync(mdev); 3134b411b363SPhilipp Reisner 3135b411b363SPhilipp Reisner return TRUE; 3136b411b363SPhilipp Reisner } 3137b411b363SPhilipp Reisner 313802918be2SPhilipp Reisner static int receive_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3139b411b363SPhilipp Reisner { 314002918be2SPhilipp Reisner struct p_state *p = &mdev->data.rbuf.state; 31414ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3142b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 314365d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3144b411b363SPhilipp Reisner int rv; 3145b411b363SPhilipp Reisner 3146b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3147b411b363SPhilipp Reisner 3148b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3149b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3150b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3151b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3152b411b363SPhilipp Reisner } 3153b411b363SPhilipp Reisner 3154b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3155b411b363SPhilipp Reisner retry: 31564ac4aadaSLars Ellenberg os = ns = mdev->state; 3157b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3158b411b363SPhilipp Reisner 3159e9ef7bb6SLars Ellenberg /* peer says his disk is uptodate, while we think it is inconsistent, 3160e9ef7bb6SLars Ellenberg * and this happens while we think we have a sync going on. */ 3161e9ef7bb6SLars Ellenberg if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && 3162e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3163e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3164e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3165e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3166e9ef7bb6SLars Ellenberg * syncing states. 3167e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3168e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3169e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3170e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3171e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3172e9ef7bb6SLars Ellenberg 3173e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3174e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3175e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3176e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3177e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3178e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3179e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 3180e9ef7bb6SLars Ellenberg return TRUE; 3181e9ef7bb6SLars Ellenberg } 3182e9ef7bb6SLars Ellenberg } 3183e9ef7bb6SLars Ellenberg 3184e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3185e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3186e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3187e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3188e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3189e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3190e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3191e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3192e9ef7bb6SLars Ellenberg 31934ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 31944ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3195b411b363SPhilipp Reisner 319667531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 319767531718SPhilipp Reisner ns.conn = C_BEHIND; 319867531718SPhilipp Reisner 3199b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3200b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3201b411b363SPhilipp Reisner int cr; /* consider resync */ 3202b411b363SPhilipp Reisner 3203b411b363SPhilipp Reisner /* if we established a new connection */ 32044ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3205b411b363SPhilipp Reisner /* if we had an established connection 3206b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 32074ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3208b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 32094ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3210b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3211b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3212b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3213b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3214b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 32154ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3216b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3217b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3218b411b363SPhilipp Reisner 3219b411b363SPhilipp Reisner if (cr) 32204ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3221b411b363SPhilipp Reisner 3222b411b363SPhilipp Reisner put_ldev(mdev); 32234ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 32244ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3225b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 322682f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3227b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3228b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3229b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3230580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3231b411b363SPhilipp Reisner } else { 3232cf14c2e9SPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) 3233cf14c2e9SPhilipp Reisner return FALSE; 32344ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 3235b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3236b411b363SPhilipp Reisner return FALSE; 3237b411b363SPhilipp Reisner } 3238b411b363SPhilipp Reisner } 3239b411b363SPhilipp Reisner } 3240b411b363SPhilipp Reisner 3241b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 32424ac4aadaSLars Ellenberg if (mdev->state.i != os.i) 3243b411b363SPhilipp Reisner goto retry; 3244b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3245b411b363SPhilipp Reisner ns.peer = peer_state.role; 3246b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3247b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 32484ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3249b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 32504ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 32514ac4aadaSLars Ellenberg if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3252481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 3253481c6f50SPhilipp Reisner /* Do not allow tl_restart(resend) for a rebooted peer. We can only allow this 3254481c6f50SPhilipp Reisner for temporal network outages! */ 3255481c6f50SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3256481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 3257481c6f50SPhilipp Reisner tl_clear(mdev); 3258481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3259481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 3260481c6f50SPhilipp Reisner drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0)); 3261481c6f50SPhilipp Reisner return FALSE; 3262481c6f50SPhilipp Reisner } 326365d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 3264b411b363SPhilipp Reisner ns = mdev->state; 3265b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3266b411b363SPhilipp Reisner 3267b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 3268b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3269b411b363SPhilipp Reisner return FALSE; 3270b411b363SPhilipp Reisner } 3271b411b363SPhilipp Reisner 32724ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 32734ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3274b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3275b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3276b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3277b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3278b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3279b411b363SPhilipp Reisner drbd_send_state(mdev); 3280b411b363SPhilipp Reisner } 3281b411b363SPhilipp Reisner } 3282b411b363SPhilipp Reisner 3283b411b363SPhilipp Reisner mdev->net_conf->want_lose = 0; 3284b411b363SPhilipp Reisner 3285b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3286b411b363SPhilipp Reisner 3287b411b363SPhilipp Reisner return TRUE; 3288b411b363SPhilipp Reisner } 3289b411b363SPhilipp Reisner 329002918be2SPhilipp Reisner static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3291b411b363SPhilipp Reisner { 329202918be2SPhilipp Reisner struct p_rs_uuid *p = &mdev->data.rbuf.rs_uuid; 3293b411b363SPhilipp Reisner 3294b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3295b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3296c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3297b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3298b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3299b411b363SPhilipp Reisner 3300b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3301b411b363SPhilipp Reisner 3302b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3303b411b363SPhilipp Reisner _not_ be rotated into the history */ 3304b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3305b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3306b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3307b411b363SPhilipp Reisner 3308b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3309b411b363SPhilipp Reisner 3310b411b363SPhilipp Reisner put_ldev(mdev); 3311b411b363SPhilipp Reisner } else 3312b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3313b411b363SPhilipp Reisner 3314b411b363SPhilipp Reisner return TRUE; 3315b411b363SPhilipp Reisner } 3316b411b363SPhilipp Reisner 3317b411b363SPhilipp Reisner enum receive_bitmap_ret { OK, DONE, FAILED }; 3318b411b363SPhilipp Reisner 3319b411b363SPhilipp Reisner static enum receive_bitmap_ret 332002918be2SPhilipp Reisner receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size, 3321b411b363SPhilipp Reisner unsigned long *buffer, struct bm_xfer_ctx *c) 3322b411b363SPhilipp Reisner { 3323b411b363SPhilipp Reisner unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); 3324b411b363SPhilipp Reisner unsigned want = num_words * sizeof(long); 3325b411b363SPhilipp Reisner 332602918be2SPhilipp Reisner if (want != data_size) { 332702918be2SPhilipp Reisner dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size); 3328b411b363SPhilipp Reisner return FAILED; 3329b411b363SPhilipp Reisner } 3330b411b363SPhilipp Reisner if (want == 0) 3331b411b363SPhilipp Reisner return DONE; 3332b411b363SPhilipp Reisner if (drbd_recv(mdev, buffer, want) != want) 3333b411b363SPhilipp Reisner return FAILED; 3334b411b363SPhilipp Reisner 3335b411b363SPhilipp Reisner drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); 3336b411b363SPhilipp Reisner 3337b411b363SPhilipp Reisner c->word_offset += num_words; 3338b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3339b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3340b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3341b411b363SPhilipp Reisner 3342b411b363SPhilipp Reisner return OK; 3343b411b363SPhilipp Reisner } 3344b411b363SPhilipp Reisner 3345b411b363SPhilipp Reisner static enum receive_bitmap_ret 3346b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3347b411b363SPhilipp Reisner struct p_compressed_bm *p, 3348b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3349b411b363SPhilipp Reisner { 3350b411b363SPhilipp Reisner struct bitstream bs; 3351b411b363SPhilipp Reisner u64 look_ahead; 3352b411b363SPhilipp Reisner u64 rl; 3353b411b363SPhilipp Reisner u64 tmp; 3354b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3355b411b363SPhilipp Reisner unsigned long e; 3356004352faSLars Ellenberg int len = be16_to_cpu(p->head.length) - (sizeof(*p) - sizeof(p->head)); 3357b411b363SPhilipp Reisner int toggle = DCBP_get_start(p); 3358b411b363SPhilipp Reisner int have; 3359b411b363SPhilipp Reisner int bits; 3360b411b363SPhilipp Reisner 3361b411b363SPhilipp Reisner bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); 3362b411b363SPhilipp Reisner 3363b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3364b411b363SPhilipp Reisner if (bits < 0) 3365b411b363SPhilipp Reisner return FAILED; 3366b411b363SPhilipp Reisner 3367b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3368b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3369b411b363SPhilipp Reisner if (bits <= 0) 3370b411b363SPhilipp Reisner return FAILED; 3371b411b363SPhilipp Reisner 3372b411b363SPhilipp Reisner if (toggle) { 3373b411b363SPhilipp Reisner e = s + rl -1; 3374b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3375b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 3376b411b363SPhilipp Reisner return FAILED; 3377b411b363SPhilipp Reisner } 3378b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3379b411b363SPhilipp Reisner } 3380b411b363SPhilipp Reisner 3381b411b363SPhilipp Reisner if (have < bits) { 3382b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3383b411b363SPhilipp Reisner have, bits, look_ahead, 3384b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3385b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 3386b411b363SPhilipp Reisner return FAILED; 3387b411b363SPhilipp Reisner } 3388b411b363SPhilipp Reisner look_ahead >>= bits; 3389b411b363SPhilipp Reisner have -= bits; 3390b411b363SPhilipp Reisner 3391b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3392b411b363SPhilipp Reisner if (bits < 0) 3393b411b363SPhilipp Reisner return FAILED; 3394b411b363SPhilipp Reisner look_ahead |= tmp << have; 3395b411b363SPhilipp Reisner have += bits; 3396b411b363SPhilipp Reisner } 3397b411b363SPhilipp Reisner 3398b411b363SPhilipp Reisner c->bit_offset = s; 3399b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3400b411b363SPhilipp Reisner 3401b411b363SPhilipp Reisner return (s == c->bm_bits) ? DONE : OK; 3402b411b363SPhilipp Reisner } 3403b411b363SPhilipp Reisner 3404b411b363SPhilipp Reisner static enum receive_bitmap_ret 3405b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3406b411b363SPhilipp Reisner struct p_compressed_bm *p, 3407b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3408b411b363SPhilipp Reisner { 3409b411b363SPhilipp Reisner if (DCBP_get_code(p) == RLE_VLI_Bits) 3410b411b363SPhilipp Reisner return recv_bm_rle_bits(mdev, p, c); 3411b411b363SPhilipp Reisner 3412b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3413b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3414b411b363SPhilipp Reisner * during all our tests. */ 3415b411b363SPhilipp Reisner 3416b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 3417b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3418b411b363SPhilipp Reisner return FAILED; 3419b411b363SPhilipp Reisner } 3420b411b363SPhilipp Reisner 3421b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3422b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3423b411b363SPhilipp Reisner { 3424b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 34250b70a13dSPhilipp Reisner unsigned plain = sizeof(struct p_header80) * 3426b411b363SPhilipp Reisner ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) 3427b411b363SPhilipp Reisner + c->bm_words * sizeof(long); 3428b411b363SPhilipp Reisner unsigned total = c->bytes[0] + c->bytes[1]; 3429b411b363SPhilipp Reisner unsigned r; 3430b411b363SPhilipp Reisner 3431b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3432b411b363SPhilipp Reisner if (total == 0) 3433b411b363SPhilipp Reisner return; 3434b411b363SPhilipp Reisner 3435b411b363SPhilipp Reisner /* don't report if not compressed */ 3436b411b363SPhilipp Reisner if (total >= plain) 3437b411b363SPhilipp Reisner return; 3438b411b363SPhilipp Reisner 3439b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3440b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3441b411b363SPhilipp Reisner : (1000 * total / plain); 3442b411b363SPhilipp Reisner 3443b411b363SPhilipp Reisner if (r > 1000) 3444b411b363SPhilipp Reisner r = 1000; 3445b411b363SPhilipp Reisner 3446b411b363SPhilipp Reisner r = 1000 - r; 3447b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3448b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3449b411b363SPhilipp Reisner direction, 3450b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3451b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3452b411b363SPhilipp Reisner total, r/10, r % 10); 3453b411b363SPhilipp Reisner } 3454b411b363SPhilipp Reisner 3455b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3456b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3457b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3458b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3459b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3460b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3461b411b363SPhilipp Reisner 3462b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 346302918be2SPhilipp Reisner static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3464b411b363SPhilipp Reisner { 3465b411b363SPhilipp Reisner struct bm_xfer_ctx c; 3466b411b363SPhilipp Reisner void *buffer; 3467b411b363SPhilipp Reisner enum receive_bitmap_ret ret; 3468b411b363SPhilipp Reisner int ok = FALSE; 346902918be2SPhilipp Reisner struct p_header80 *h = &mdev->data.rbuf.header.h80; 3470b411b363SPhilipp Reisner 3471b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); 3472b411b363SPhilipp Reisner 3473b411b363SPhilipp Reisner drbd_bm_lock(mdev, "receive bitmap"); 3474b411b363SPhilipp Reisner 3475b411b363SPhilipp Reisner /* maybe we should use some per thread scratch page, 3476b411b363SPhilipp Reisner * and allocate that during initial device creation? */ 3477b411b363SPhilipp Reisner buffer = (unsigned long *) __get_free_page(GFP_NOIO); 3478b411b363SPhilipp Reisner if (!buffer) { 3479b411b363SPhilipp Reisner dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); 3480b411b363SPhilipp Reisner goto out; 3481b411b363SPhilipp Reisner } 3482b411b363SPhilipp Reisner 3483b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3484b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3485b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3486b411b363SPhilipp Reisner }; 3487b411b363SPhilipp Reisner 3488b411b363SPhilipp Reisner do { 348902918be2SPhilipp Reisner if (cmd == P_BITMAP) { 349002918be2SPhilipp Reisner ret = receive_bitmap_plain(mdev, data_size, buffer, &c); 349102918be2SPhilipp Reisner } else if (cmd == P_COMPRESSED_BITMAP) { 3492b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3493b411b363SPhilipp Reisner * and the feature is enabled! */ 3494b411b363SPhilipp Reisner struct p_compressed_bm *p; 3495b411b363SPhilipp Reisner 349602918be2SPhilipp Reisner if (data_size > BM_PACKET_PAYLOAD_BYTES) { 3497b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 3498b411b363SPhilipp Reisner goto out; 3499b411b363SPhilipp Reisner } 3500b411b363SPhilipp Reisner /* use the page buff */ 3501b411b363SPhilipp Reisner p = buffer; 3502b411b363SPhilipp Reisner memcpy(p, h, sizeof(*h)); 350302918be2SPhilipp Reisner if (drbd_recv(mdev, p->head.payload, data_size) != data_size) 3504b411b363SPhilipp Reisner goto out; 3505004352faSLars Ellenberg if (data_size <= (sizeof(*p) - sizeof(p->head))) { 3506004352faSLars Ellenberg dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size); 3507b411b363SPhilipp Reisner return FAILED; 3508b411b363SPhilipp Reisner } 3509b411b363SPhilipp Reisner ret = decode_bitmap_c(mdev, p, &c); 3510b411b363SPhilipp Reisner } else { 351102918be2SPhilipp Reisner dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd); 3512b411b363SPhilipp Reisner goto out; 3513b411b363SPhilipp Reisner } 3514b411b363SPhilipp Reisner 351502918be2SPhilipp Reisner c.packets[cmd == P_BITMAP]++; 351602918be2SPhilipp Reisner c.bytes[cmd == P_BITMAP] += sizeof(struct p_header80) + data_size; 3517b411b363SPhilipp Reisner 3518b411b363SPhilipp Reisner if (ret != OK) 3519b411b363SPhilipp Reisner break; 3520b411b363SPhilipp Reisner 352102918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &data_size)) 3522b411b363SPhilipp Reisner goto out; 3523b411b363SPhilipp Reisner } while (ret == OK); 3524b411b363SPhilipp Reisner if (ret == FAILED) 3525b411b363SPhilipp Reisner goto out; 3526b411b363SPhilipp Reisner 3527b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 3528b411b363SPhilipp Reisner 3529b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 3530b411b363SPhilipp Reisner ok = !drbd_send_bitmap(mdev); 3531b411b363SPhilipp Reisner if (!ok) 3532b411b363SPhilipp Reisner goto out; 3533b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 3534b411b363SPhilipp Reisner ok = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 3535b411b363SPhilipp Reisner D_ASSERT(ok == SS_SUCCESS); 3536b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 3537b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 3538b411b363SPhilipp Reisner * other threads may have noticed network errors */ 3539b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 3540b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3541b411b363SPhilipp Reisner } 3542b411b363SPhilipp Reisner 3543b411b363SPhilipp Reisner ok = TRUE; 3544b411b363SPhilipp Reisner out: 3545b411b363SPhilipp Reisner drbd_bm_unlock(mdev); 3546b411b363SPhilipp Reisner if (ok && mdev->state.conn == C_WF_BITMAP_S) 3547b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 3548b411b363SPhilipp Reisner free_page((unsigned long) buffer); 3549b411b363SPhilipp Reisner return ok; 3550b411b363SPhilipp Reisner } 3551b411b363SPhilipp Reisner 355202918be2SPhilipp Reisner static int receive_skip(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3553b411b363SPhilipp Reisner { 3554b411b363SPhilipp Reisner /* TODO zero copy sink :) */ 3555b411b363SPhilipp Reisner static char sink[128]; 3556b411b363SPhilipp Reisner int size, want, r; 3557b411b363SPhilipp Reisner 3558b411b363SPhilipp Reisner dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", 355902918be2SPhilipp Reisner cmd, data_size); 3560b411b363SPhilipp Reisner 356102918be2SPhilipp Reisner size = data_size; 3562b411b363SPhilipp Reisner while (size > 0) { 3563b411b363SPhilipp Reisner want = min_t(int, size, sizeof(sink)); 3564b411b363SPhilipp Reisner r = drbd_recv(mdev, sink, want); 3565b411b363SPhilipp Reisner ERR_IF(r <= 0) break; 3566b411b363SPhilipp Reisner size -= r; 3567b411b363SPhilipp Reisner } 3568b411b363SPhilipp Reisner return size == 0; 3569b411b363SPhilipp Reisner } 3570b411b363SPhilipp Reisner 357102918be2SPhilipp Reisner static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 3572b411b363SPhilipp Reisner { 3573b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 3574b411b363SPhilipp Reisner * with the data requests being unplugged */ 3575b411b363SPhilipp Reisner drbd_tcp_quickack(mdev->data.socket); 3576b411b363SPhilipp Reisner 3577b411b363SPhilipp Reisner return TRUE; 3578b411b363SPhilipp Reisner } 3579b411b363SPhilipp Reisner 358073a01a18SPhilipp Reisner static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) 358173a01a18SPhilipp Reisner { 358273a01a18SPhilipp Reisner struct p_block_desc *p = &mdev->data.rbuf.block_desc; 358373a01a18SPhilipp Reisner 358473a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 358573a01a18SPhilipp Reisner 358673a01a18SPhilipp Reisner return TRUE; 358773a01a18SPhilipp Reisner } 358873a01a18SPhilipp Reisner 358902918be2SPhilipp Reisner typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, enum drbd_packets cmd, unsigned int to_receive); 3590b411b363SPhilipp Reisner 359102918be2SPhilipp Reisner struct data_cmd { 359202918be2SPhilipp Reisner int expect_payload; 359302918be2SPhilipp Reisner size_t pkt_size; 359402918be2SPhilipp Reisner drbd_cmd_handler_f function; 3595b411b363SPhilipp Reisner }; 3596b411b363SPhilipp Reisner 359702918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 359802918be2SPhilipp Reisner [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 359902918be2SPhilipp Reisner [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 360002918be2SPhilipp Reisner [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 360102918be2SPhilipp Reisner [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 360202918be2SPhilipp Reisner [P_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } , 360302918be2SPhilipp Reisner [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } , 360402918be2SPhilipp Reisner [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header80), receive_UnplugRemote }, 360502918be2SPhilipp Reisner [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 360602918be2SPhilipp Reisner [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 360702918be2SPhilipp Reisner [P_SYNC_PARAM] = { 1, sizeof(struct p_header80), receive_SyncParam }, 360802918be2SPhilipp Reisner [P_SYNC_PARAM89] = { 1, sizeof(struct p_header80), receive_SyncParam }, 360902918be2SPhilipp Reisner [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 361002918be2SPhilipp Reisner [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 361102918be2SPhilipp Reisner [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 361202918be2SPhilipp Reisner [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 361302918be2SPhilipp Reisner [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 361402918be2SPhilipp Reisner [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 361502918be2SPhilipp Reisner [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 361602918be2SPhilipp Reisner [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 361702918be2SPhilipp Reisner [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 361802918be2SPhilipp Reisner [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 361973a01a18SPhilipp Reisner [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 362002918be2SPhilipp Reisner /* anything missing from this table is in 362102918be2SPhilipp Reisner * the asender_tbl, see get_asender_cmd */ 362202918be2SPhilipp Reisner [P_MAX_CMD] = { 0, 0, NULL }, 362302918be2SPhilipp Reisner }; 362402918be2SPhilipp Reisner 362502918be2SPhilipp Reisner /* All handler functions that expect a sub-header get that sub-heder in 362602918be2SPhilipp Reisner mdev->data.rbuf.header.head.payload. 362702918be2SPhilipp Reisner 362802918be2SPhilipp Reisner Usually in mdev->data.rbuf.header.head the callback can find the usual 362902918be2SPhilipp Reisner p_header, but they may not rely on that. Since there is also p_header95 ! 363002918be2SPhilipp Reisner */ 3631b411b363SPhilipp Reisner 3632b411b363SPhilipp Reisner static void drbdd(struct drbd_conf *mdev) 3633b411b363SPhilipp Reisner { 363402918be2SPhilipp Reisner union p_header *header = &mdev->data.rbuf.header; 363502918be2SPhilipp Reisner unsigned int packet_size; 363602918be2SPhilipp Reisner enum drbd_packets cmd; 363702918be2SPhilipp Reisner size_t shs; /* sub header size */ 363802918be2SPhilipp Reisner int rv; 3639b411b363SPhilipp Reisner 3640b411b363SPhilipp Reisner while (get_t_state(&mdev->receiver) == Running) { 3641b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 364202918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &packet_size)) 364302918be2SPhilipp Reisner goto err_out; 364402918be2SPhilipp Reisner 364502918be2SPhilipp Reisner if (unlikely(cmd >= P_MAX_CMD || !drbd_cmd_handler[cmd].function)) { 364602918be2SPhilipp Reisner dev_err(DEV, "unknown packet type %d, l: %d!\n", cmd, packet_size); 364702918be2SPhilipp Reisner goto err_out; 36480b33a916SLars Ellenberg } 3649b411b363SPhilipp Reisner 365002918be2SPhilipp Reisner shs = drbd_cmd_handler[cmd].pkt_size - sizeof(union p_header); 3651c13f7e1aSLars Ellenberg if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) { 3652c13f7e1aSLars Ellenberg dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size); 3653c13f7e1aSLars Ellenberg goto err_out; 3654c13f7e1aSLars Ellenberg } 3655c13f7e1aSLars Ellenberg 3656c13f7e1aSLars Ellenberg if (shs) { 365702918be2SPhilipp Reisner rv = drbd_recv(mdev, &header->h80.payload, shs); 365802918be2SPhilipp Reisner if (unlikely(rv != shs)) { 365902918be2SPhilipp Reisner dev_err(DEV, "short read while reading sub header: rv=%d\n", rv); 366002918be2SPhilipp Reisner goto err_out; 3661b411b363SPhilipp Reisner } 366202918be2SPhilipp Reisner } 366302918be2SPhilipp Reisner 366402918be2SPhilipp Reisner rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs); 366502918be2SPhilipp Reisner 366602918be2SPhilipp Reisner if (unlikely(!rv)) { 3667b411b363SPhilipp Reisner dev_err(DEV, "error receiving %s, l: %d!\n", 366802918be2SPhilipp Reisner cmdname(cmd), packet_size); 366902918be2SPhilipp Reisner goto err_out; 3670b411b363SPhilipp Reisner } 3671b411b363SPhilipp Reisner } 367202918be2SPhilipp Reisner 367302918be2SPhilipp Reisner if (0) { 367402918be2SPhilipp Reisner err_out: 3675b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3676b411b363SPhilipp Reisner } 3677856c50c7SLars Ellenberg /* If we leave here, we probably want to update at least the 3678856c50c7SLars Ellenberg * "Connected" indicator on stable storage. Do so explicitly here. */ 3679856c50c7SLars Ellenberg drbd_md_sync(mdev); 3680b411b363SPhilipp Reisner } 3681b411b363SPhilipp Reisner 3682b411b363SPhilipp Reisner void drbd_flush_workqueue(struct drbd_conf *mdev) 3683b411b363SPhilipp Reisner { 3684b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 3685b411b363SPhilipp Reisner 3686b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 3687b411b363SPhilipp Reisner init_completion(&barr.done); 3688b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, &barr.w); 3689b411b363SPhilipp Reisner wait_for_completion(&barr.done); 3690b411b363SPhilipp Reisner } 3691b411b363SPhilipp Reisner 3692f70b3511SPhilipp Reisner void drbd_free_tl_hash(struct drbd_conf *mdev) 3693f70b3511SPhilipp Reisner { 3694f70b3511SPhilipp Reisner struct hlist_head *h; 3695f70b3511SPhilipp Reisner 3696f70b3511SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3697f70b3511SPhilipp Reisner 3698f70b3511SPhilipp Reisner if (!mdev->tl_hash || mdev->state.conn != C_STANDALONE) { 3699f70b3511SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3700f70b3511SPhilipp Reisner return; 3701f70b3511SPhilipp Reisner } 3702f70b3511SPhilipp Reisner /* paranoia code */ 3703f70b3511SPhilipp Reisner for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++) 3704f70b3511SPhilipp Reisner if (h->first) 3705f70b3511SPhilipp Reisner dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n", 3706f70b3511SPhilipp Reisner (int)(h - mdev->ee_hash), h->first); 3707f70b3511SPhilipp Reisner kfree(mdev->ee_hash); 3708f70b3511SPhilipp Reisner mdev->ee_hash = NULL; 3709f70b3511SPhilipp Reisner mdev->ee_hash_s = 0; 3710f70b3511SPhilipp Reisner 3711f70b3511SPhilipp Reisner /* paranoia code */ 3712f70b3511SPhilipp Reisner for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++) 3713f70b3511SPhilipp Reisner if (h->first) 3714f70b3511SPhilipp Reisner dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n", 3715f70b3511SPhilipp Reisner (int)(h - mdev->tl_hash), h->first); 3716f70b3511SPhilipp Reisner kfree(mdev->tl_hash); 3717f70b3511SPhilipp Reisner mdev->tl_hash = NULL; 3718f70b3511SPhilipp Reisner mdev->tl_hash_s = 0; 3719f70b3511SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3720f70b3511SPhilipp Reisner } 3721f70b3511SPhilipp Reisner 3722b411b363SPhilipp Reisner static void drbd_disconnect(struct drbd_conf *mdev) 3723b411b363SPhilipp Reisner { 3724b411b363SPhilipp Reisner enum drbd_fencing_p fp; 3725b411b363SPhilipp Reisner union drbd_state os, ns; 3726b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 3727b411b363SPhilipp Reisner unsigned int i; 3728b411b363SPhilipp Reisner 3729b411b363SPhilipp Reisner if (mdev->state.conn == C_STANDALONE) 3730b411b363SPhilipp Reisner return; 3731b411b363SPhilipp Reisner if (mdev->state.conn >= C_WF_CONNECTION) 3732b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED cstate = %s, expected < WFConnection\n", 3733b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3734b411b363SPhilipp Reisner 3735b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 3736b411b363SPhilipp Reisner drbd_thread_stop(&mdev->asender); 3737b411b363SPhilipp Reisner drbd_free_sock(mdev); 3738b411b363SPhilipp Reisner 373985719573SPhilipp Reisner /* wait for current activity to cease. */ 3740b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3741b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 3742b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 3743b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 3744b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3745b411b363SPhilipp Reisner 3746b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 3747b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 3748b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 3749b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 3750b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 3751b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 3752b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 3753b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 3754b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 3755b411b363SPhilipp Reisner * on the fly. */ 3756b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 3757b411b363SPhilipp Reisner mdev->rs_total = 0; 3758b411b363SPhilipp Reisner mdev->rs_failed = 0; 3759b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 3760b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 3761b411b363SPhilipp Reisner 3762b411b363SPhilipp Reisner /* make sure syncer is stopped and w_resume_next_sg queued */ 3763b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 3764b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 3765b411b363SPhilipp Reisner 3766b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 3767b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 3768b411b363SPhilipp Reisner * to be "canceled" */ 3769b411b363SPhilipp Reisner drbd_flush_workqueue(mdev); 3770b411b363SPhilipp Reisner 3771b411b363SPhilipp Reisner /* This also does reclaim_net_ee(). If we do this too early, we might 3772b411b363SPhilipp Reisner * miss some resync ee and pages.*/ 3773b411b363SPhilipp Reisner drbd_process_done_ee(mdev); 3774b411b363SPhilipp Reisner 3775b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3776b411b363SPhilipp Reisner mdev->p_uuid = NULL; 3777b411b363SPhilipp Reisner 3778fb22c402SPhilipp Reisner if (!is_susp(mdev->state)) 3779b411b363SPhilipp Reisner tl_clear(mdev); 3780b411b363SPhilipp Reisner 3781b411b363SPhilipp Reisner dev_info(DEV, "Connection closed\n"); 3782b411b363SPhilipp Reisner 3783b411b363SPhilipp Reisner drbd_md_sync(mdev); 3784b411b363SPhilipp Reisner 3785b411b363SPhilipp Reisner fp = FP_DONT_CARE; 3786b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3787b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 3788b411b363SPhilipp Reisner put_ldev(mdev); 3789b411b363SPhilipp Reisner } 3790b411b363SPhilipp Reisner 379187f7be4cSPhilipp Reisner if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) 379287f7be4cSPhilipp Reisner drbd_try_outdate_peer_async(mdev); 3793b411b363SPhilipp Reisner 3794b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3795b411b363SPhilipp Reisner os = mdev->state; 3796b411b363SPhilipp Reisner if (os.conn >= C_UNCONNECTED) { 3797b411b363SPhilipp Reisner /* Do not restart in case we are C_DISCONNECTING */ 3798b411b363SPhilipp Reisner ns = os; 3799b411b363SPhilipp Reisner ns.conn = C_UNCONNECTED; 3800b411b363SPhilipp Reisner rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 3801b411b363SPhilipp Reisner } 3802b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3803b411b363SPhilipp Reisner 3804b411b363SPhilipp Reisner if (os.conn == C_DISCONNECTING) { 380584dfb9f5SPhilipp Reisner wait_event(mdev->net_cnt_wait, atomic_read(&mdev->net_cnt) == 0); 3806b411b363SPhilipp Reisner 3807fb22c402SPhilipp Reisner if (!is_susp(mdev->state)) { 3808b411b363SPhilipp Reisner /* we must not free the tl_hash 3809b411b363SPhilipp Reisner * while application io is still on the fly */ 3810f70b3511SPhilipp Reisner wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); 3811f70b3511SPhilipp Reisner drbd_free_tl_hash(mdev); 3812f70b3511SPhilipp Reisner } 3813b411b363SPhilipp Reisner 3814b411b363SPhilipp Reisner crypto_free_hash(mdev->cram_hmac_tfm); 3815b411b363SPhilipp Reisner mdev->cram_hmac_tfm = NULL; 3816b411b363SPhilipp Reisner 3817b411b363SPhilipp Reisner kfree(mdev->net_conf); 3818b411b363SPhilipp Reisner mdev->net_conf = NULL; 3819b411b363SPhilipp Reisner drbd_request_state(mdev, NS(conn, C_STANDALONE)); 3820b411b363SPhilipp Reisner } 3821b411b363SPhilipp Reisner 3822b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 3823b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 3824b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 3825b411b363SPhilipp Reisner * 3826b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 3827b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 3828b411b363SPhilipp Reisner */ 3829b411b363SPhilipp Reisner i = drbd_release_ee(mdev, &mdev->net_ee); 3830b411b363SPhilipp Reisner if (i) 3831b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 3832435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 3833435f0740SLars Ellenberg if (i) 3834435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 3835b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 3836b411b363SPhilipp Reisner if (i) 383745bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 3838b411b363SPhilipp Reisner 3839b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 3840b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 3841b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 3842b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 3843b411b363SPhilipp Reisner 3844b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 3845b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 3846b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 3847b411b363SPhilipp Reisner } 3848b411b363SPhilipp Reisner 3849b411b363SPhilipp Reisner /* 3850b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 3851b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 3852b411b363SPhilipp Reisner * 3853b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 3854b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 3855b411b363SPhilipp Reisner * 3856b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 3857b411b363SPhilipp Reisner */ 3858b411b363SPhilipp Reisner static int drbd_send_handshake(struct drbd_conf *mdev) 3859b411b363SPhilipp Reisner { 3860b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3861b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.sbuf.handshake; 3862b411b363SPhilipp Reisner int ok; 3863b411b363SPhilipp Reisner 3864b411b363SPhilipp Reisner if (mutex_lock_interruptible(&mdev->data.mutex)) { 3865b411b363SPhilipp Reisner dev_err(DEV, "interrupted during initial handshake\n"); 3866b411b363SPhilipp Reisner return 0; /* interrupted. not ok. */ 3867b411b363SPhilipp Reisner } 3868b411b363SPhilipp Reisner 3869b411b363SPhilipp Reisner if (mdev->data.socket == NULL) { 3870b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3871b411b363SPhilipp Reisner return 0; 3872b411b363SPhilipp Reisner } 3873b411b363SPhilipp Reisner 3874b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 3875b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 3876b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 3877b411b363SPhilipp Reisner ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE, 38780b70a13dSPhilipp Reisner (struct p_header80 *)p, sizeof(*p), 0 ); 3879b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3880b411b363SPhilipp Reisner return ok; 3881b411b363SPhilipp Reisner } 3882b411b363SPhilipp Reisner 3883b411b363SPhilipp Reisner /* 3884b411b363SPhilipp Reisner * return values: 3885b411b363SPhilipp Reisner * 1 yes, we have a valid connection 3886b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 3887b411b363SPhilipp Reisner * -1 peer talks different language, 3888b411b363SPhilipp Reisner * no point in trying again, please go standalone. 3889b411b363SPhilipp Reisner */ 3890b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev) 3891b411b363SPhilipp Reisner { 3892b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3893b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.rbuf.handshake; 389402918be2SPhilipp Reisner const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80); 389502918be2SPhilipp Reisner unsigned int length; 389602918be2SPhilipp Reisner enum drbd_packets cmd; 3897b411b363SPhilipp Reisner int rv; 3898b411b363SPhilipp Reisner 3899b411b363SPhilipp Reisner rv = drbd_send_handshake(mdev); 3900b411b363SPhilipp Reisner if (!rv) 3901b411b363SPhilipp Reisner return 0; 3902b411b363SPhilipp Reisner 390302918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 3904b411b363SPhilipp Reisner if (!rv) 3905b411b363SPhilipp Reisner return 0; 3906b411b363SPhilipp Reisner 390702918be2SPhilipp Reisner if (cmd != P_HAND_SHAKE) { 3908b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", 390902918be2SPhilipp Reisner cmdname(cmd), cmd); 3910b411b363SPhilipp Reisner return -1; 3911b411b363SPhilipp Reisner } 3912b411b363SPhilipp Reisner 391302918be2SPhilipp Reisner if (length != expect) { 3914b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake length: %u, received: %u\n", 391502918be2SPhilipp Reisner expect, length); 3916b411b363SPhilipp Reisner return -1; 3917b411b363SPhilipp Reisner } 3918b411b363SPhilipp Reisner 3919b411b363SPhilipp Reisner rv = drbd_recv(mdev, &p->head.payload, expect); 3920b411b363SPhilipp Reisner 3921b411b363SPhilipp Reisner if (rv != expect) { 3922b411b363SPhilipp Reisner dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv); 3923b411b363SPhilipp Reisner return 0; 3924b411b363SPhilipp Reisner } 3925b411b363SPhilipp Reisner 3926b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 3927b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 3928b411b363SPhilipp Reisner if (p->protocol_max == 0) 3929b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 3930b411b363SPhilipp Reisner 3931b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 3932b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 3933b411b363SPhilipp Reisner goto incompat; 3934b411b363SPhilipp Reisner 3935b411b363SPhilipp Reisner mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 3936b411b363SPhilipp Reisner 3937b411b363SPhilipp Reisner dev_info(DEV, "Handshake successful: " 3938b411b363SPhilipp Reisner "Agreed network protocol version %d\n", mdev->agreed_pro_version); 3939b411b363SPhilipp Reisner 3940b411b363SPhilipp Reisner return 1; 3941b411b363SPhilipp Reisner 3942b411b363SPhilipp Reisner incompat: 3943b411b363SPhilipp Reisner dev_err(DEV, "incompatible DRBD dialects: " 3944b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 3945b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 3946b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 3947b411b363SPhilipp Reisner return -1; 3948b411b363SPhilipp Reisner } 3949b411b363SPhilipp Reisner 3950b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 3951b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 3952b411b363SPhilipp Reisner { 3953b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 3954b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 3955b10d96cbSJohannes Thoma return -1; 3956b411b363SPhilipp Reisner } 3957b411b363SPhilipp Reisner #else 3958b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 3959b10d96cbSJohannes Thoma 3960b10d96cbSJohannes Thoma /* Return value: 3961b10d96cbSJohannes Thoma 1 - auth succeeded, 3962b10d96cbSJohannes Thoma 0 - failed, try again (network error), 3963b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 3964b10d96cbSJohannes Thoma */ 3965b10d96cbSJohannes Thoma 3966b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 3967b411b363SPhilipp Reisner { 3968b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 3969b411b363SPhilipp Reisner struct scatterlist sg; 3970b411b363SPhilipp Reisner char *response = NULL; 3971b411b363SPhilipp Reisner char *right_response = NULL; 3972b411b363SPhilipp Reisner char *peers_ch = NULL; 3973b411b363SPhilipp Reisner unsigned int key_len = strlen(mdev->net_conf->shared_secret); 3974b411b363SPhilipp Reisner unsigned int resp_size; 3975b411b363SPhilipp Reisner struct hash_desc desc; 397602918be2SPhilipp Reisner enum drbd_packets cmd; 397702918be2SPhilipp Reisner unsigned int length; 3978b411b363SPhilipp Reisner int rv; 3979b411b363SPhilipp Reisner 3980b411b363SPhilipp Reisner desc.tfm = mdev->cram_hmac_tfm; 3981b411b363SPhilipp Reisner desc.flags = 0; 3982b411b363SPhilipp Reisner 3983b411b363SPhilipp Reisner rv = crypto_hash_setkey(mdev->cram_hmac_tfm, 3984b411b363SPhilipp Reisner (u8 *)mdev->net_conf->shared_secret, key_len); 3985b411b363SPhilipp Reisner if (rv) { 3986b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); 3987b10d96cbSJohannes Thoma rv = -1; 3988b411b363SPhilipp Reisner goto fail; 3989b411b363SPhilipp Reisner } 3990b411b363SPhilipp Reisner 3991b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 3992b411b363SPhilipp Reisner 3993b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); 3994b411b363SPhilipp Reisner if (!rv) 3995b411b363SPhilipp Reisner goto fail; 3996b411b363SPhilipp Reisner 399702918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 3998b411b363SPhilipp Reisner if (!rv) 3999b411b363SPhilipp Reisner goto fail; 4000b411b363SPhilipp Reisner 400102918be2SPhilipp Reisner if (cmd != P_AUTH_CHALLENGE) { 4002b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", 400302918be2SPhilipp Reisner cmdname(cmd), cmd); 4004b411b363SPhilipp Reisner rv = 0; 4005b411b363SPhilipp Reisner goto fail; 4006b411b363SPhilipp Reisner } 4007b411b363SPhilipp Reisner 400802918be2SPhilipp Reisner if (length > CHALLENGE_LEN * 2) { 4009b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge payload too big.\n"); 4010b10d96cbSJohannes Thoma rv = -1; 4011b411b363SPhilipp Reisner goto fail; 4012b411b363SPhilipp Reisner } 4013b411b363SPhilipp Reisner 401402918be2SPhilipp Reisner peers_ch = kmalloc(length, GFP_NOIO); 4015b411b363SPhilipp Reisner if (peers_ch == NULL) { 4016b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of peers_ch failed\n"); 4017b10d96cbSJohannes Thoma rv = -1; 4018b411b363SPhilipp Reisner goto fail; 4019b411b363SPhilipp Reisner } 4020b411b363SPhilipp Reisner 402102918be2SPhilipp Reisner rv = drbd_recv(mdev, peers_ch, length); 4022b411b363SPhilipp Reisner 402302918be2SPhilipp Reisner if (rv != length) { 4024b411b363SPhilipp Reisner dev_err(DEV, "short read AuthChallenge: l=%u\n", rv); 4025b411b363SPhilipp Reisner rv = 0; 4026b411b363SPhilipp Reisner goto fail; 4027b411b363SPhilipp Reisner } 4028b411b363SPhilipp Reisner 4029b411b363SPhilipp Reisner resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm); 4030b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4031b411b363SPhilipp Reisner if (response == NULL) { 4032b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of response failed\n"); 4033b10d96cbSJohannes Thoma rv = -1; 4034b411b363SPhilipp Reisner goto fail; 4035b411b363SPhilipp Reisner } 4036b411b363SPhilipp Reisner 4037b411b363SPhilipp Reisner sg_init_table(&sg, 1); 403802918be2SPhilipp Reisner sg_set_buf(&sg, peers_ch, length); 4039b411b363SPhilipp Reisner 4040b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4041b411b363SPhilipp Reisner if (rv) { 4042b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4043b10d96cbSJohannes Thoma rv = -1; 4044b411b363SPhilipp Reisner goto fail; 4045b411b363SPhilipp Reisner } 4046b411b363SPhilipp Reisner 4047b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); 4048b411b363SPhilipp Reisner if (!rv) 4049b411b363SPhilipp Reisner goto fail; 4050b411b363SPhilipp Reisner 405102918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4052b411b363SPhilipp Reisner if (!rv) 4053b411b363SPhilipp Reisner goto fail; 4054b411b363SPhilipp Reisner 405502918be2SPhilipp Reisner if (cmd != P_AUTH_RESPONSE) { 4056b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", 405702918be2SPhilipp Reisner cmdname(cmd), cmd); 4058b411b363SPhilipp Reisner rv = 0; 4059b411b363SPhilipp Reisner goto fail; 4060b411b363SPhilipp Reisner } 4061b411b363SPhilipp Reisner 406202918be2SPhilipp Reisner if (length != resp_size) { 4063b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse payload of wrong size\n"); 4064b411b363SPhilipp Reisner rv = 0; 4065b411b363SPhilipp Reisner goto fail; 4066b411b363SPhilipp Reisner } 4067b411b363SPhilipp Reisner 4068b411b363SPhilipp Reisner rv = drbd_recv(mdev, response , resp_size); 4069b411b363SPhilipp Reisner 4070b411b363SPhilipp Reisner if (rv != resp_size) { 4071b411b363SPhilipp Reisner dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv); 4072b411b363SPhilipp Reisner rv = 0; 4073b411b363SPhilipp Reisner goto fail; 4074b411b363SPhilipp Reisner } 4075b411b363SPhilipp Reisner 4076b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 40772d1ee87dSJulia Lawall if (right_response == NULL) { 4078b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of right_response failed\n"); 4079b10d96cbSJohannes Thoma rv = -1; 4080b411b363SPhilipp Reisner goto fail; 4081b411b363SPhilipp Reisner } 4082b411b363SPhilipp Reisner 4083b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4084b411b363SPhilipp Reisner 4085b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4086b411b363SPhilipp Reisner if (rv) { 4087b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4088b10d96cbSJohannes Thoma rv = -1; 4089b411b363SPhilipp Reisner goto fail; 4090b411b363SPhilipp Reisner } 4091b411b363SPhilipp Reisner 4092b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4093b411b363SPhilipp Reisner 4094b411b363SPhilipp Reisner if (rv) 4095b411b363SPhilipp Reisner dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", 4096b411b363SPhilipp Reisner resp_size, mdev->net_conf->cram_hmac_alg); 4097b10d96cbSJohannes Thoma else 4098b10d96cbSJohannes Thoma rv = -1; 4099b411b363SPhilipp Reisner 4100b411b363SPhilipp Reisner fail: 4101b411b363SPhilipp Reisner kfree(peers_ch); 4102b411b363SPhilipp Reisner kfree(response); 4103b411b363SPhilipp Reisner kfree(right_response); 4104b411b363SPhilipp Reisner 4105b411b363SPhilipp Reisner return rv; 4106b411b363SPhilipp Reisner } 4107b411b363SPhilipp Reisner #endif 4108b411b363SPhilipp Reisner 4109b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4110b411b363SPhilipp Reisner { 4111b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 4112b411b363SPhilipp Reisner unsigned int minor = mdev_to_minor(mdev); 4113b411b363SPhilipp Reisner int h; 4114b411b363SPhilipp Reisner 4115b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_receiver", minor); 4116b411b363SPhilipp Reisner 4117b411b363SPhilipp Reisner dev_info(DEV, "receiver (re)started\n"); 4118b411b363SPhilipp Reisner 4119b411b363SPhilipp Reisner do { 4120b411b363SPhilipp Reisner h = drbd_connect(mdev); 4121b411b363SPhilipp Reisner if (h == 0) { 4122b411b363SPhilipp Reisner drbd_disconnect(mdev); 4123b411b363SPhilipp Reisner __set_current_state(TASK_INTERRUPTIBLE); 4124b411b363SPhilipp Reisner schedule_timeout(HZ); 4125b411b363SPhilipp Reisner } 4126b411b363SPhilipp Reisner if (h == -1) { 4127b411b363SPhilipp Reisner dev_warn(DEV, "Discarding network configuration.\n"); 4128b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4129b411b363SPhilipp Reisner } 4130b411b363SPhilipp Reisner } while (h == 0); 4131b411b363SPhilipp Reisner 4132b411b363SPhilipp Reisner if (h > 0) { 4133b411b363SPhilipp Reisner if (get_net_conf(mdev)) { 4134b411b363SPhilipp Reisner drbdd(mdev); 4135b411b363SPhilipp Reisner put_net_conf(mdev); 4136b411b363SPhilipp Reisner } 4137b411b363SPhilipp Reisner } 4138b411b363SPhilipp Reisner 4139b411b363SPhilipp Reisner drbd_disconnect(mdev); 4140b411b363SPhilipp Reisner 4141b411b363SPhilipp Reisner dev_info(DEV, "receiver terminated\n"); 4142b411b363SPhilipp Reisner return 0; 4143b411b363SPhilipp Reisner } 4144b411b363SPhilipp Reisner 4145b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4146b411b363SPhilipp Reisner 41470b70a13dSPhilipp Reisner static int got_RqSReply(struct drbd_conf *mdev, struct p_header80 *h) 4148b411b363SPhilipp Reisner { 4149b411b363SPhilipp Reisner struct p_req_state_reply *p = (struct p_req_state_reply *)h; 4150b411b363SPhilipp Reisner 4151b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4152b411b363SPhilipp Reisner 4153b411b363SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4154b411b363SPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4155b411b363SPhilipp Reisner } else { 4156b411b363SPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4157b411b363SPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4158b411b363SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4159b411b363SPhilipp Reisner } 4160b411b363SPhilipp Reisner wake_up(&mdev->state_wait); 4161b411b363SPhilipp Reisner 4162b411b363SPhilipp Reisner return TRUE; 4163b411b363SPhilipp Reisner } 4164b411b363SPhilipp Reisner 41650b70a13dSPhilipp Reisner static int got_Ping(struct drbd_conf *mdev, struct p_header80 *h) 4166b411b363SPhilipp Reisner { 4167b411b363SPhilipp Reisner return drbd_send_ping_ack(mdev); 4168b411b363SPhilipp Reisner 4169b411b363SPhilipp Reisner } 4170b411b363SPhilipp Reisner 41710b70a13dSPhilipp Reisner static int got_PingAck(struct drbd_conf *mdev, struct p_header80 *h) 4172b411b363SPhilipp Reisner { 4173b411b363SPhilipp Reisner /* restore idle timeout */ 4174b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 4175309d1608SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags)) 4176309d1608SPhilipp Reisner wake_up(&mdev->misc_wait); 4177b411b363SPhilipp Reisner 4178b411b363SPhilipp Reisner return TRUE; 4179b411b363SPhilipp Reisner } 4180b411b363SPhilipp Reisner 41810b70a13dSPhilipp Reisner static int got_IsInSync(struct drbd_conf *mdev, struct p_header80 *h) 4182b411b363SPhilipp Reisner { 4183b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4184b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4185b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4186b411b363SPhilipp Reisner 4187b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 4188b411b363SPhilipp Reisner 4189b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4190b411b363SPhilipp Reisner 41911d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4192b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4193b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4194b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4195b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 41961d53f09eSLars Ellenberg put_ldev(mdev); 41971d53f09eSLars Ellenberg } 4198b411b363SPhilipp Reisner dec_rs_pending(mdev); 4199778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4200b411b363SPhilipp Reisner 4201b411b363SPhilipp Reisner return TRUE; 4202b411b363SPhilipp Reisner } 4203b411b363SPhilipp Reisner 4204b411b363SPhilipp Reisner /* when we receive the ACK for a write request, 4205b411b363SPhilipp Reisner * verify that we actually know about it */ 4206b411b363SPhilipp Reisner static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev, 4207b411b363SPhilipp Reisner u64 id, sector_t sector) 4208b411b363SPhilipp Reisner { 4209b411b363SPhilipp Reisner struct hlist_head *slot = tl_hash_slot(mdev, sector); 4210b411b363SPhilipp Reisner struct hlist_node *n; 4211b411b363SPhilipp Reisner struct drbd_request *req; 4212b411b363SPhilipp Reisner 4213b411b363SPhilipp Reisner hlist_for_each_entry(req, n, slot, colision) { 4214b411b363SPhilipp Reisner if ((unsigned long)req == (unsigned long)id) { 4215b411b363SPhilipp Reisner if (req->sector != sector) { 4216b411b363SPhilipp Reisner dev_err(DEV, "_ack_id_to_req: found req %p but it has " 4217b411b363SPhilipp Reisner "wrong sector (%llus versus %llus)\n", req, 4218b411b363SPhilipp Reisner (unsigned long long)req->sector, 4219b411b363SPhilipp Reisner (unsigned long long)sector); 4220b411b363SPhilipp Reisner break; 4221b411b363SPhilipp Reisner } 4222b411b363SPhilipp Reisner return req; 4223b411b363SPhilipp Reisner } 4224b411b363SPhilipp Reisner } 4225b411b363SPhilipp Reisner dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n", 4226b411b363SPhilipp Reisner (void *)(unsigned long)id, (unsigned long long)sector); 4227b411b363SPhilipp Reisner return NULL; 4228b411b363SPhilipp Reisner } 4229b411b363SPhilipp Reisner 4230b411b363SPhilipp Reisner typedef struct drbd_request *(req_validator_fn) 4231b411b363SPhilipp Reisner (struct drbd_conf *mdev, u64 id, sector_t sector); 4232b411b363SPhilipp Reisner 4233b411b363SPhilipp Reisner static int validate_req_change_req_state(struct drbd_conf *mdev, 4234b411b363SPhilipp Reisner u64 id, sector_t sector, req_validator_fn validator, 4235b411b363SPhilipp Reisner const char *func, enum drbd_req_event what) 4236b411b363SPhilipp Reisner { 4237b411b363SPhilipp Reisner struct drbd_request *req; 4238b411b363SPhilipp Reisner struct bio_and_error m; 4239b411b363SPhilipp Reisner 4240b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4241b411b363SPhilipp Reisner req = validator(mdev, id, sector); 4242b411b363SPhilipp Reisner if (unlikely(!req)) { 4243b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4244b411b363SPhilipp Reisner dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func); 4245b411b363SPhilipp Reisner return FALSE; 4246b411b363SPhilipp Reisner } 4247b411b363SPhilipp Reisner __req_mod(req, what, &m); 4248b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4249b411b363SPhilipp Reisner 4250b411b363SPhilipp Reisner if (m.bio) 4251b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 4252b411b363SPhilipp Reisner return TRUE; 4253b411b363SPhilipp Reisner } 4254b411b363SPhilipp Reisner 42550b70a13dSPhilipp Reisner static int got_BlockAck(struct drbd_conf *mdev, struct p_header80 *h) 4256b411b363SPhilipp Reisner { 4257b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4258b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4259b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4260b411b363SPhilipp Reisner enum drbd_req_event what; 4261b411b363SPhilipp Reisner 4262b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4263b411b363SPhilipp Reisner 4264b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4265b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4266b411b363SPhilipp Reisner dec_rs_pending(mdev); 4267b411b363SPhilipp Reisner return TRUE; 4268b411b363SPhilipp Reisner } 4269b411b363SPhilipp Reisner switch (be16_to_cpu(h->command)) { 4270b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 4271b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4272b411b363SPhilipp Reisner what = write_acked_by_peer_and_sis; 4273b411b363SPhilipp Reisner break; 4274b411b363SPhilipp Reisner case P_WRITE_ACK: 4275b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4276b411b363SPhilipp Reisner what = write_acked_by_peer; 4277b411b363SPhilipp Reisner break; 4278b411b363SPhilipp Reisner case P_RECV_ACK: 4279b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B); 4280b411b363SPhilipp Reisner what = recv_acked_by_peer; 4281b411b363SPhilipp Reisner break; 4282b411b363SPhilipp Reisner case P_DISCARD_ACK: 4283b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4284b411b363SPhilipp Reisner what = conflict_discarded_by_peer; 4285b411b363SPhilipp Reisner break; 4286b411b363SPhilipp Reisner default: 4287b411b363SPhilipp Reisner D_ASSERT(0); 4288b411b363SPhilipp Reisner return FALSE; 4289b411b363SPhilipp Reisner } 4290b411b363SPhilipp Reisner 4291b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4292b411b363SPhilipp Reisner _ack_id_to_req, __func__ , what); 4293b411b363SPhilipp Reisner } 4294b411b363SPhilipp Reisner 42950b70a13dSPhilipp Reisner static int got_NegAck(struct drbd_conf *mdev, struct p_header80 *h) 4296b411b363SPhilipp Reisner { 4297b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4298b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4299b411b363SPhilipp Reisner 4300b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 4301b411b363SPhilipp Reisner dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n"); 4302b411b363SPhilipp Reisner 4303b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4304b411b363SPhilipp Reisner 4305b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4306b411b363SPhilipp Reisner int size = be32_to_cpu(p->blksize); 4307b411b363SPhilipp Reisner dec_rs_pending(mdev); 4308b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4309b411b363SPhilipp Reisner return TRUE; 4310b411b363SPhilipp Reisner } 4311b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4312b411b363SPhilipp Reisner _ack_id_to_req, __func__ , neg_acked); 4313b411b363SPhilipp Reisner } 4314b411b363SPhilipp Reisner 43150b70a13dSPhilipp Reisner static int got_NegDReply(struct drbd_conf *mdev, struct p_header80 *h) 4316b411b363SPhilipp Reisner { 4317b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4318b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4319b411b363SPhilipp Reisner 4320b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4321b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4322b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4323b411b363SPhilipp Reisner 4324b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4325b411b363SPhilipp Reisner _ar_id_to_req, __func__ , neg_acked); 4326b411b363SPhilipp Reisner } 4327b411b363SPhilipp Reisner 43280b70a13dSPhilipp Reisner static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header80 *h) 4329b411b363SPhilipp Reisner { 4330b411b363SPhilipp Reisner sector_t sector; 4331b411b363SPhilipp Reisner int size; 4332b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4333b411b363SPhilipp Reisner 4334b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4335b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4336b411b363SPhilipp Reisner 4337b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4338b411b363SPhilipp Reisner 4339b411b363SPhilipp Reisner dec_rs_pending(mdev); 4340b411b363SPhilipp Reisner 4341b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4342b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4343b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4344b411b363SPhilipp Reisner put_ldev(mdev); 4345b411b363SPhilipp Reisner } 4346b411b363SPhilipp Reisner 4347b411b363SPhilipp Reisner return TRUE; 4348b411b363SPhilipp Reisner } 4349b411b363SPhilipp Reisner 43500b70a13dSPhilipp Reisner static int got_BarrierAck(struct drbd_conf *mdev, struct p_header80 *h) 4351b411b363SPhilipp Reisner { 4352b411b363SPhilipp Reisner struct p_barrier_ack *p = (struct p_barrier_ack *)h; 4353b411b363SPhilipp Reisner 4354b411b363SPhilipp Reisner tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); 4355b411b363SPhilipp Reisner 4356c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 4357c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 4358c4752ef1SPhilipp Reisner list_empty(&mdev->start_resync_work.list)) { 4359c4752ef1SPhilipp Reisner struct drbd_work *w = &mdev->start_resync_work; 4360c4752ef1SPhilipp Reisner w->cb = w_start_resync; 4361c4752ef1SPhilipp Reisner drbd_queue_work_front(&mdev->data.work, w); 4362c4752ef1SPhilipp Reisner } 4363c4752ef1SPhilipp Reisner 4364b411b363SPhilipp Reisner return TRUE; 4365b411b363SPhilipp Reisner } 4366b411b363SPhilipp Reisner 43670b70a13dSPhilipp Reisner static int got_OVResult(struct drbd_conf *mdev, struct p_header80 *h) 4368b411b363SPhilipp Reisner { 4369b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4370b411b363SPhilipp Reisner struct drbd_work *w; 4371b411b363SPhilipp Reisner sector_t sector; 4372b411b363SPhilipp Reisner int size; 4373b411b363SPhilipp Reisner 4374b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4375b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4376b411b363SPhilipp Reisner 4377b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4378b411b363SPhilipp Reisner 4379b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 4380b411b363SPhilipp Reisner drbd_ov_oos_found(mdev, sector, size); 4381b411b363SPhilipp Reisner else 4382b411b363SPhilipp Reisner ov_oos_print(mdev); 4383b411b363SPhilipp Reisner 43841d53f09eSLars Ellenberg if (!get_ldev(mdev)) 43851d53f09eSLars Ellenberg return TRUE; 43861d53f09eSLars Ellenberg 4387b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4388b411b363SPhilipp Reisner dec_rs_pending(mdev); 4389b411b363SPhilipp Reisner 4390ea5442afSLars Ellenberg --mdev->ov_left; 4391ea5442afSLars Ellenberg 4392ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 4393ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 4394ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 4395ea5442afSLars Ellenberg 4396ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 4397b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4398b411b363SPhilipp Reisner if (w) { 4399b411b363SPhilipp Reisner w->cb = w_ov_finished; 4400b411b363SPhilipp Reisner drbd_queue_work_front(&mdev->data.work, w); 4401b411b363SPhilipp Reisner } else { 4402b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 4403b411b363SPhilipp Reisner ov_oos_print(mdev); 4404b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4405b411b363SPhilipp Reisner } 4406b411b363SPhilipp Reisner } 44071d53f09eSLars Ellenberg put_ldev(mdev); 4408b411b363SPhilipp Reisner return TRUE; 4409b411b363SPhilipp Reisner } 4410b411b363SPhilipp Reisner 441102918be2SPhilipp Reisner static int got_skip(struct drbd_conf *mdev, struct p_header80 *h) 44120ced55a3SPhilipp Reisner { 44130ced55a3SPhilipp Reisner return TRUE; 44140ced55a3SPhilipp Reisner } 44150ced55a3SPhilipp Reisner 4416b411b363SPhilipp Reisner struct asender_cmd { 4417b411b363SPhilipp Reisner size_t pkt_size; 44180b70a13dSPhilipp Reisner int (*process)(struct drbd_conf *mdev, struct p_header80 *h); 4419b411b363SPhilipp Reisner }; 4420b411b363SPhilipp Reisner 4421b411b363SPhilipp Reisner static struct asender_cmd *get_asender_cmd(int cmd) 4422b411b363SPhilipp Reisner { 4423b411b363SPhilipp Reisner static struct asender_cmd asender_tbl[] = { 4424b411b363SPhilipp Reisner /* anything missing from this table is in 4425b411b363SPhilipp Reisner * the drbd_cmd_handler (drbd_default_handler) table, 4426b411b363SPhilipp Reisner * see the beginning of drbdd() */ 44270b70a13dSPhilipp Reisner [P_PING] = { sizeof(struct p_header80), got_Ping }, 44280b70a13dSPhilipp Reisner [P_PING_ACK] = { sizeof(struct p_header80), got_PingAck }, 4429b411b363SPhilipp Reisner [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4430b411b363SPhilipp Reisner [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4431b411b363SPhilipp Reisner [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4432b411b363SPhilipp Reisner [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4433b411b363SPhilipp Reisner [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 4434b411b363SPhilipp Reisner [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 4435b411b363SPhilipp Reisner [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4436b411b363SPhilipp Reisner [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 4437b411b363SPhilipp Reisner [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 4438b411b363SPhilipp Reisner [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 4439b411b363SPhilipp Reisner [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 444002918be2SPhilipp Reisner [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 4441b411b363SPhilipp Reisner [P_MAX_CMD] = { 0, NULL }, 4442b411b363SPhilipp Reisner }; 4443b411b363SPhilipp Reisner if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) 4444b411b363SPhilipp Reisner return NULL; 4445b411b363SPhilipp Reisner return &asender_tbl[cmd]; 4446b411b363SPhilipp Reisner } 4447b411b363SPhilipp Reisner 4448b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4449b411b363SPhilipp Reisner { 4450b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 445102918be2SPhilipp Reisner struct p_header80 *h = &mdev->meta.rbuf.header.h80; 4452b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 4453b411b363SPhilipp Reisner 4454b411b363SPhilipp Reisner int rv, len; 4455b411b363SPhilipp Reisner void *buf = h; 4456b411b363SPhilipp Reisner int received = 0; 44570b70a13dSPhilipp Reisner int expect = sizeof(struct p_header80); 4458b411b363SPhilipp Reisner int empty; 4459b411b363SPhilipp Reisner 4460b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); 4461b411b363SPhilipp Reisner 4462b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 4463b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 4464b411b363SPhilipp Reisner 4465b411b363SPhilipp Reisner while (get_t_state(thi) == Running) { 4466b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 4467b411b363SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &mdev->flags)) { 4468b411b363SPhilipp Reisner ERR_IF(!drbd_send_ping(mdev)) goto reconnect; 4469b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = 4470b411b363SPhilipp Reisner mdev->net_conf->ping_timeo*HZ/10; 4471b411b363SPhilipp Reisner } 4472b411b363SPhilipp Reisner 4473b411b363SPhilipp Reisner /* conditionally cork; 4474b411b363SPhilipp Reisner * it may hurt latency if we cork without much to send */ 4475b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork && 4476b411b363SPhilipp Reisner 3 < atomic_read(&mdev->unacked_cnt)) 4477b411b363SPhilipp Reisner drbd_tcp_cork(mdev->meta.socket); 4478b411b363SPhilipp Reisner while (1) { 4479b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4480b411b363SPhilipp Reisner flush_signals(current); 44810f8488e1SLars Ellenberg if (!drbd_process_done_ee(mdev)) 4482b411b363SPhilipp Reisner goto reconnect; 4483b411b363SPhilipp Reisner /* to avoid race with newly queued ACKs */ 4484b411b363SPhilipp Reisner set_bit(SIGNAL_ASENDER, &mdev->flags); 4485b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4486b411b363SPhilipp Reisner empty = list_empty(&mdev->done_ee); 4487b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4488b411b363SPhilipp Reisner /* new ack may have been queued right here, 4489b411b363SPhilipp Reisner * but then there is also a signal pending, 4490b411b363SPhilipp Reisner * and we start over... */ 4491b411b363SPhilipp Reisner if (empty) 4492b411b363SPhilipp Reisner break; 4493b411b363SPhilipp Reisner } 4494b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 4495b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork) 4496b411b363SPhilipp Reisner drbd_tcp_uncork(mdev->meta.socket); 4497b411b363SPhilipp Reisner 4498b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 4499b411b363SPhilipp Reisner if (signal_pending(current)) 4500b411b363SPhilipp Reisner continue; 4501b411b363SPhilipp Reisner 4502b411b363SPhilipp Reisner rv = drbd_recv_short(mdev, mdev->meta.socket, 4503b411b363SPhilipp Reisner buf, expect-received, 0); 4504b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4505b411b363SPhilipp Reisner 4506b411b363SPhilipp Reisner flush_signals(current); 4507b411b363SPhilipp Reisner 4508b411b363SPhilipp Reisner /* Note: 4509b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 4510b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 4511b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 4512b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 4513b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 4514b411b363SPhilipp Reisner * rv == expected: full header or command 4515b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 4516b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 4517b411b363SPhilipp Reisner */ 4518b411b363SPhilipp Reisner if (likely(rv > 0)) { 4519b411b363SPhilipp Reisner received += rv; 4520b411b363SPhilipp Reisner buf += rv; 4521b411b363SPhilipp Reisner } else if (rv == 0) { 4522b411b363SPhilipp Reisner dev_err(DEV, "meta connection shut down by peer.\n"); 4523b411b363SPhilipp Reisner goto reconnect; 4524b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 4525b411b363SPhilipp Reisner if (mdev->meta.socket->sk->sk_rcvtimeo == 4526b411b363SPhilipp Reisner mdev->net_conf->ping_timeo*HZ/10) { 4527b411b363SPhilipp Reisner dev_err(DEV, "PingAck did not arrive in time.\n"); 4528b411b363SPhilipp Reisner goto reconnect; 4529b411b363SPhilipp Reisner } 4530b411b363SPhilipp Reisner set_bit(SEND_PING, &mdev->flags); 4531b411b363SPhilipp Reisner continue; 4532b411b363SPhilipp Reisner } else if (rv == -EINTR) { 4533b411b363SPhilipp Reisner continue; 4534b411b363SPhilipp Reisner } else { 4535b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 4536b411b363SPhilipp Reisner goto reconnect; 4537b411b363SPhilipp Reisner } 4538b411b363SPhilipp Reisner 4539b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 4540b411b363SPhilipp Reisner if (unlikely(h->magic != BE_DRBD_MAGIC)) { 4541004352faSLars Ellenberg dev_err(DEV, "magic?? on meta m: 0x%08x c: %d l: %d\n", 4542004352faSLars Ellenberg be32_to_cpu(h->magic), 4543004352faSLars Ellenberg be16_to_cpu(h->command), 4544004352faSLars Ellenberg be16_to_cpu(h->length)); 4545b411b363SPhilipp Reisner goto reconnect; 4546b411b363SPhilipp Reisner } 4547b411b363SPhilipp Reisner cmd = get_asender_cmd(be16_to_cpu(h->command)); 4548b411b363SPhilipp Reisner len = be16_to_cpu(h->length); 4549b411b363SPhilipp Reisner if (unlikely(cmd == NULL)) { 4550004352faSLars Ellenberg dev_err(DEV, "unknown command?? on meta m: 0x%08x c: %d l: %d\n", 4551004352faSLars Ellenberg be32_to_cpu(h->magic), 4552004352faSLars Ellenberg be16_to_cpu(h->command), 4553004352faSLars Ellenberg be16_to_cpu(h->length)); 4554b411b363SPhilipp Reisner goto disconnect; 4555b411b363SPhilipp Reisner } 4556b411b363SPhilipp Reisner expect = cmd->pkt_size; 45570b70a13dSPhilipp Reisner ERR_IF(len != expect-sizeof(struct p_header80)) 4558b411b363SPhilipp Reisner goto reconnect; 4559b411b363SPhilipp Reisner } 4560b411b363SPhilipp Reisner if (received == expect) { 4561b411b363SPhilipp Reisner D_ASSERT(cmd != NULL); 4562b411b363SPhilipp Reisner if (!cmd->process(mdev, h)) 4563b411b363SPhilipp Reisner goto reconnect; 4564b411b363SPhilipp Reisner 4565b411b363SPhilipp Reisner buf = h; 4566b411b363SPhilipp Reisner received = 0; 45670b70a13dSPhilipp Reisner expect = sizeof(struct p_header80); 4568b411b363SPhilipp Reisner cmd = NULL; 4569b411b363SPhilipp Reisner } 4570b411b363SPhilipp Reisner } 4571b411b363SPhilipp Reisner 4572b411b363SPhilipp Reisner if (0) { 4573b411b363SPhilipp Reisner reconnect: 4574b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); 4575856c50c7SLars Ellenberg drbd_md_sync(mdev); 4576b411b363SPhilipp Reisner } 4577b411b363SPhilipp Reisner if (0) { 4578b411b363SPhilipp Reisner disconnect: 4579b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4580856c50c7SLars Ellenberg drbd_md_sync(mdev); 4581b411b363SPhilipp Reisner } 4582b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4583b411b363SPhilipp Reisner 4584b411b363SPhilipp Reisner D_ASSERT(mdev->state.conn < C_CONNECTED); 4585b411b363SPhilipp Reisner dev_info(DEV, "asender terminated\n"); 4586b411b363SPhilipp Reisner 4587b411b363SPhilipp Reisner return 0; 4588b411b363SPhilipp Reisner } 4589