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/smp_lock.h> 40b411b363SPhilipp Reisner #include <linux/pkt_sched.h> 41b411b363SPhilipp Reisner #define __KERNEL_SYSCALLS__ 42b411b363SPhilipp Reisner #include <linux/unistd.h> 43b411b363SPhilipp Reisner #include <linux/vmalloc.h> 44b411b363SPhilipp Reisner #include <linux/random.h> 45b411b363SPhilipp Reisner #include <linux/string.h> 46b411b363SPhilipp Reisner #include <linux/scatterlist.h> 47b411b363SPhilipp Reisner #include "drbd_int.h" 48b411b363SPhilipp Reisner #include "drbd_req.h" 49b411b363SPhilipp Reisner 50b411b363SPhilipp Reisner #include "drbd_vli.h" 51b411b363SPhilipp Reisner 52b411b363SPhilipp Reisner struct flush_work { 53b411b363SPhilipp Reisner struct drbd_work w; 54b411b363SPhilipp Reisner struct drbd_epoch *epoch; 55b411b363SPhilipp Reisner }; 56b411b363SPhilipp Reisner 57b411b363SPhilipp Reisner enum finish_epoch { 58b411b363SPhilipp Reisner FE_STILL_LIVE, 59b411b363SPhilipp Reisner FE_DESTROYED, 60b411b363SPhilipp Reisner FE_RECYCLED, 61b411b363SPhilipp Reisner }; 62b411b363SPhilipp Reisner 63b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev); 64b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev); 65b411b363SPhilipp Reisner 66b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); 67b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *, struct drbd_work *, int); 68b411b363SPhilipp Reisner 69b411b363SPhilipp Reisner static struct drbd_epoch *previous_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch) 70b411b363SPhilipp Reisner { 71b411b363SPhilipp Reisner struct drbd_epoch *prev; 72b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 73b411b363SPhilipp Reisner prev = list_entry(epoch->list.prev, struct drbd_epoch, list); 74b411b363SPhilipp Reisner if (prev == epoch || prev == mdev->current_epoch) 75b411b363SPhilipp Reisner prev = NULL; 76b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 77b411b363SPhilipp Reisner return prev; 78b411b363SPhilipp Reisner } 79b411b363SPhilipp Reisner 80b411b363SPhilipp Reisner #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) 81b411b363SPhilipp Reisner 8245bb912bSLars Ellenberg /* 8345bb912bSLars Ellenberg * some helper functions to deal with single linked page lists, 8445bb912bSLars Ellenberg * page->private being our "next" pointer. 8545bb912bSLars Ellenberg */ 8645bb912bSLars Ellenberg 8745bb912bSLars Ellenberg /* If at least n pages are linked at head, get n pages off. 8845bb912bSLars Ellenberg * Otherwise, don't modify head, and return NULL. 8945bb912bSLars Ellenberg * Locking is the responsibility of the caller. 9045bb912bSLars Ellenberg */ 9145bb912bSLars Ellenberg static struct page *page_chain_del(struct page **head, int n) 9245bb912bSLars Ellenberg { 9345bb912bSLars Ellenberg struct page *page; 9445bb912bSLars Ellenberg struct page *tmp; 9545bb912bSLars Ellenberg 9645bb912bSLars Ellenberg BUG_ON(!n); 9745bb912bSLars Ellenberg BUG_ON(!head); 9845bb912bSLars Ellenberg 9945bb912bSLars Ellenberg page = *head; 10023ce4227SPhilipp Reisner 10123ce4227SPhilipp Reisner if (!page) 10223ce4227SPhilipp Reisner return NULL; 10323ce4227SPhilipp Reisner 10445bb912bSLars Ellenberg while (page) { 10545bb912bSLars Ellenberg tmp = page_chain_next(page); 10645bb912bSLars Ellenberg if (--n == 0) 10745bb912bSLars Ellenberg break; /* found sufficient pages */ 10845bb912bSLars Ellenberg if (tmp == NULL) 10945bb912bSLars Ellenberg /* insufficient pages, don't use any of them. */ 11045bb912bSLars Ellenberg return NULL; 11145bb912bSLars Ellenberg page = tmp; 11245bb912bSLars Ellenberg } 11345bb912bSLars Ellenberg 11445bb912bSLars Ellenberg /* add end of list marker for the returned list */ 11545bb912bSLars Ellenberg set_page_private(page, 0); 11645bb912bSLars Ellenberg /* actual return value, and adjustment of head */ 11745bb912bSLars Ellenberg page = *head; 11845bb912bSLars Ellenberg *head = tmp; 11945bb912bSLars Ellenberg return page; 12045bb912bSLars Ellenberg } 12145bb912bSLars Ellenberg 12245bb912bSLars Ellenberg /* may be used outside of locks to find the tail of a (usually short) 12345bb912bSLars Ellenberg * "private" page chain, before adding it back to a global chain head 12445bb912bSLars Ellenberg * with page_chain_add() under a spinlock. */ 12545bb912bSLars Ellenberg static struct page *page_chain_tail(struct page *page, int *len) 12645bb912bSLars Ellenberg { 12745bb912bSLars Ellenberg struct page *tmp; 12845bb912bSLars Ellenberg int i = 1; 12945bb912bSLars Ellenberg while ((tmp = page_chain_next(page))) 13045bb912bSLars Ellenberg ++i, page = tmp; 13145bb912bSLars Ellenberg if (len) 13245bb912bSLars Ellenberg *len = i; 13345bb912bSLars Ellenberg return page; 13445bb912bSLars Ellenberg } 13545bb912bSLars Ellenberg 13645bb912bSLars Ellenberg static int page_chain_free(struct page *page) 13745bb912bSLars Ellenberg { 13845bb912bSLars Ellenberg struct page *tmp; 13945bb912bSLars Ellenberg int i = 0; 14045bb912bSLars Ellenberg page_chain_for_each_safe(page, tmp) { 14145bb912bSLars Ellenberg put_page(page); 14245bb912bSLars Ellenberg ++i; 14345bb912bSLars Ellenberg } 14445bb912bSLars Ellenberg return i; 14545bb912bSLars Ellenberg } 14645bb912bSLars Ellenberg 14745bb912bSLars Ellenberg static void page_chain_add(struct page **head, 14845bb912bSLars Ellenberg struct page *chain_first, struct page *chain_last) 14945bb912bSLars Ellenberg { 15045bb912bSLars Ellenberg #if 1 15145bb912bSLars Ellenberg struct page *tmp; 15245bb912bSLars Ellenberg tmp = page_chain_tail(chain_first, NULL); 15345bb912bSLars Ellenberg BUG_ON(tmp != chain_last); 15445bb912bSLars Ellenberg #endif 15545bb912bSLars Ellenberg 15645bb912bSLars Ellenberg /* add chain to head */ 15745bb912bSLars Ellenberg set_page_private(chain_last, (unsigned long)*head); 15845bb912bSLars Ellenberg *head = chain_first; 15945bb912bSLars Ellenberg } 16045bb912bSLars Ellenberg 16145bb912bSLars Ellenberg static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number) 162b411b363SPhilipp Reisner { 163b411b363SPhilipp Reisner struct page *page = NULL; 16445bb912bSLars Ellenberg struct page *tmp = NULL; 16545bb912bSLars Ellenberg int i = 0; 166b411b363SPhilipp Reisner 167b411b363SPhilipp Reisner /* Yes, testing drbd_pp_vacant outside the lock is racy. 168b411b363SPhilipp Reisner * So what. It saves a spin_lock. */ 16945bb912bSLars Ellenberg if (drbd_pp_vacant >= number) { 170b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 17145bb912bSLars Ellenberg page = page_chain_del(&drbd_pp_pool, number); 17245bb912bSLars Ellenberg if (page) 17345bb912bSLars Ellenberg drbd_pp_vacant -= number; 174b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 17545bb912bSLars Ellenberg if (page) 17645bb912bSLars Ellenberg return page; 177b411b363SPhilipp Reisner } 17845bb912bSLars Ellenberg 179b411b363SPhilipp Reisner /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD 180b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 181b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 18245bb912bSLars Ellenberg for (i = 0; i < number; i++) { 18345bb912bSLars Ellenberg tmp = alloc_page(GFP_TRY); 18445bb912bSLars Ellenberg if (!tmp) 18545bb912bSLars Ellenberg break; 18645bb912bSLars Ellenberg set_page_private(tmp, (unsigned long)page); 18745bb912bSLars Ellenberg page = tmp; 18845bb912bSLars Ellenberg } 18945bb912bSLars Ellenberg 19045bb912bSLars Ellenberg if (i == number) 191b411b363SPhilipp Reisner return page; 19245bb912bSLars Ellenberg 19345bb912bSLars Ellenberg /* Not enough pages immediately available this time. 19445bb912bSLars Ellenberg * No need to jump around here, drbd_pp_alloc will retry this 19545bb912bSLars Ellenberg * function "soon". */ 19645bb912bSLars Ellenberg if (page) { 19745bb912bSLars Ellenberg tmp = page_chain_tail(page, NULL); 19845bb912bSLars Ellenberg spin_lock(&drbd_pp_lock); 19945bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 20045bb912bSLars Ellenberg drbd_pp_vacant += i; 20145bb912bSLars Ellenberg spin_unlock(&drbd_pp_lock); 20245bb912bSLars Ellenberg } 20345bb912bSLars Ellenberg return NULL; 204b411b363SPhilipp Reisner } 205b411b363SPhilipp Reisner 206b411b363SPhilipp Reisner /* kick lower level device, if we have more than (arbitrary number) 207b411b363SPhilipp Reisner * reference counts on it, which typically are locally submitted io 208b411b363SPhilipp Reisner * requests. don't use unacked_cnt, so we speed up proto A and B, too. */ 209b411b363SPhilipp Reisner static void maybe_kick_lo(struct drbd_conf *mdev) 210b411b363SPhilipp Reisner { 211b411b363SPhilipp Reisner if (atomic_read(&mdev->local_cnt) >= mdev->net_conf->unplug_watermark) 212b411b363SPhilipp Reisner drbd_kick_lo(mdev); 213b411b363SPhilipp Reisner } 214b411b363SPhilipp Reisner 215b411b363SPhilipp Reisner static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed) 216b411b363SPhilipp Reisner { 217b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 218b411b363SPhilipp Reisner struct list_head *le, *tle; 219b411b363SPhilipp Reisner 220b411b363SPhilipp Reisner /* The EEs are always appended to the end of the list. Since 221b411b363SPhilipp Reisner they are sent in order over the wire, they have to finish 222b411b363SPhilipp Reisner in order. As soon as we see the first not finished we can 223b411b363SPhilipp Reisner stop to examine the list... */ 224b411b363SPhilipp Reisner 225b411b363SPhilipp Reisner list_for_each_safe(le, tle, &mdev->net_ee) { 226b411b363SPhilipp Reisner e = list_entry(le, struct drbd_epoch_entry, w.list); 22745bb912bSLars Ellenberg if (drbd_ee_has_active_page(e)) 228b411b363SPhilipp Reisner break; 229b411b363SPhilipp Reisner list_move(le, to_be_freed); 230b411b363SPhilipp Reisner } 231b411b363SPhilipp Reisner } 232b411b363SPhilipp Reisner 233b411b363SPhilipp Reisner static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) 234b411b363SPhilipp Reisner { 235b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 236b411b363SPhilipp Reisner struct drbd_epoch_entry *e, *t; 237b411b363SPhilipp Reisner 238b411b363SPhilipp Reisner maybe_kick_lo(mdev); 239b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 240b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 241b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 242b411b363SPhilipp Reisner 243b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &reclaimed, w.list) 244b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 245b411b363SPhilipp Reisner } 246b411b363SPhilipp Reisner 247b411b363SPhilipp Reisner /** 24845bb912bSLars Ellenberg * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled) 249b411b363SPhilipp Reisner * @mdev: DRBD device. 25045bb912bSLars Ellenberg * @number: number of pages requested 25145bb912bSLars Ellenberg * @retry: whether to retry, if not enough pages are available right now 252b411b363SPhilipp Reisner * 25345bb912bSLars Ellenberg * Tries to allocate number pages, first from our own page pool, then from 25445bb912bSLars Ellenberg * the kernel, unless this allocation would exceed the max_buffers setting. 25545bb912bSLars Ellenberg * Possibly retry until DRBD frees sufficient pages somewhere else. 25645bb912bSLars Ellenberg * 25745bb912bSLars Ellenberg * Returns a page chain linked via page->private. 258b411b363SPhilipp Reisner */ 25945bb912bSLars Ellenberg static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry) 260b411b363SPhilipp Reisner { 261b411b363SPhilipp Reisner struct page *page = NULL; 262b411b363SPhilipp Reisner DEFINE_WAIT(wait); 263b411b363SPhilipp Reisner 26445bb912bSLars Ellenberg /* Yes, we may run up to @number over max_buffers. If we 26545bb912bSLars Ellenberg * follow it strictly, the admin will get it wrong anyways. */ 26645bb912bSLars Ellenberg if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) 26745bb912bSLars Ellenberg page = drbd_pp_first_pages_or_try_alloc(mdev, number); 268b411b363SPhilipp Reisner 26945bb912bSLars Ellenberg while (page == NULL) { 270b411b363SPhilipp Reisner prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); 271b411b363SPhilipp Reisner 272b411b363SPhilipp Reisner drbd_kick_lo_and_reclaim_net(mdev); 273b411b363SPhilipp Reisner 274b411b363SPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) { 27545bb912bSLars Ellenberg page = drbd_pp_first_pages_or_try_alloc(mdev, number); 276b411b363SPhilipp Reisner if (page) 277b411b363SPhilipp Reisner break; 278b411b363SPhilipp Reisner } 279b411b363SPhilipp Reisner 280b411b363SPhilipp Reisner if (!retry) 281b411b363SPhilipp Reisner break; 282b411b363SPhilipp Reisner 283b411b363SPhilipp Reisner if (signal_pending(current)) { 284b411b363SPhilipp Reisner dev_warn(DEV, "drbd_pp_alloc interrupted!\n"); 285b411b363SPhilipp Reisner break; 286b411b363SPhilipp Reisner } 287b411b363SPhilipp Reisner 288b411b363SPhilipp Reisner schedule(); 289b411b363SPhilipp Reisner } 290b411b363SPhilipp Reisner finish_wait(&drbd_pp_wait, &wait); 291b411b363SPhilipp Reisner 29245bb912bSLars Ellenberg if (page) 29345bb912bSLars Ellenberg atomic_add(number, &mdev->pp_in_use); 294b411b363SPhilipp Reisner return page; 295b411b363SPhilipp Reisner } 296b411b363SPhilipp Reisner 297b411b363SPhilipp Reisner /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc. 29845bb912bSLars Ellenberg * Is also used from inside an other spin_lock_irq(&mdev->req_lock); 29945bb912bSLars Ellenberg * Either links the page chain back to the global pool, 30045bb912bSLars Ellenberg * or returns all pages to the system. */ 301b411b363SPhilipp Reisner static void drbd_pp_free(struct drbd_conf *mdev, struct page *page) 302b411b363SPhilipp Reisner { 303b411b363SPhilipp Reisner int i; 30445bb912bSLars Ellenberg if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count) 30545bb912bSLars Ellenberg i = page_chain_free(page); 30645bb912bSLars Ellenberg else { 30745bb912bSLars Ellenberg struct page *tmp; 30845bb912bSLars Ellenberg tmp = page_chain_tail(page, &i); 309b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 31045bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 31145bb912bSLars Ellenberg drbd_pp_vacant += i; 312b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 313b411b363SPhilipp Reisner } 31445bb912bSLars Ellenberg atomic_sub(i, &mdev->pp_in_use); 31545bb912bSLars Ellenberg i = atomic_read(&mdev->pp_in_use); 31645bb912bSLars Ellenberg if (i < 0) 31745bb912bSLars Ellenberg dev_warn(DEV, "ASSERTION FAILED: pp_in_use: %d < 0\n", i); 318b411b363SPhilipp Reisner wake_up(&drbd_pp_wait); 319b411b363SPhilipp Reisner } 320b411b363SPhilipp Reisner 321b411b363SPhilipp Reisner /* 322b411b363SPhilipp Reisner You need to hold the req_lock: 323b411b363SPhilipp Reisner _drbd_wait_ee_list_empty() 324b411b363SPhilipp Reisner 325b411b363SPhilipp Reisner You must not have the req_lock: 326b411b363SPhilipp Reisner drbd_free_ee() 327b411b363SPhilipp Reisner drbd_alloc_ee() 328b411b363SPhilipp Reisner drbd_init_ee() 329b411b363SPhilipp Reisner drbd_release_ee() 330b411b363SPhilipp Reisner drbd_ee_fix_bhs() 331b411b363SPhilipp Reisner drbd_process_done_ee() 332b411b363SPhilipp Reisner drbd_clear_done_ee() 333b411b363SPhilipp Reisner drbd_wait_ee_list_empty() 334b411b363SPhilipp Reisner */ 335b411b363SPhilipp Reisner 336b411b363SPhilipp Reisner struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev, 337b411b363SPhilipp Reisner u64 id, 338b411b363SPhilipp Reisner sector_t sector, 339b411b363SPhilipp Reisner unsigned int data_size, 340b411b363SPhilipp Reisner gfp_t gfp_mask) __must_hold(local) 341b411b363SPhilipp Reisner { 342b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 343b411b363SPhilipp Reisner struct page *page; 34445bb912bSLars Ellenberg unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; 345b411b363SPhilipp Reisner 346b411b363SPhilipp Reisner if (FAULT_ACTIVE(mdev, DRBD_FAULT_AL_EE)) 347b411b363SPhilipp Reisner return NULL; 348b411b363SPhilipp Reisner 349b411b363SPhilipp Reisner e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); 350b411b363SPhilipp Reisner if (!e) { 351b411b363SPhilipp Reisner if (!(gfp_mask & __GFP_NOWARN)) 352b411b363SPhilipp Reisner dev_err(DEV, "alloc_ee: Allocation of an EE failed\n"); 353b411b363SPhilipp Reisner return NULL; 354b411b363SPhilipp Reisner } 355b411b363SPhilipp Reisner 35645bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); 35745bb912bSLars Ellenberg if (!page) 35845bb912bSLars Ellenberg goto fail; 359b411b363SPhilipp Reisner 360b411b363SPhilipp Reisner INIT_HLIST_NODE(&e->colision); 361b411b363SPhilipp Reisner e->epoch = NULL; 36245bb912bSLars Ellenberg e->mdev = mdev; 36345bb912bSLars Ellenberg e->pages = page; 36445bb912bSLars Ellenberg atomic_set(&e->pending_bios, 0); 36545bb912bSLars Ellenberg e->size = data_size; 366b411b363SPhilipp Reisner e->flags = 0; 36745bb912bSLars Ellenberg e->sector = sector; 36845bb912bSLars Ellenberg e->sector = sector; 36945bb912bSLars Ellenberg e->block_id = id; 370b411b363SPhilipp Reisner 371b411b363SPhilipp Reisner return e; 372b411b363SPhilipp Reisner 37345bb912bSLars Ellenberg fail: 374b411b363SPhilipp Reisner mempool_free(e, drbd_ee_mempool); 375b411b363SPhilipp Reisner return NULL; 376b411b363SPhilipp Reisner } 377b411b363SPhilipp Reisner 378b411b363SPhilipp Reisner void drbd_free_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e) 379b411b363SPhilipp Reisner { 38045bb912bSLars Ellenberg drbd_pp_free(mdev, e->pages); 38145bb912bSLars Ellenberg D_ASSERT(atomic_read(&e->pending_bios) == 0); 382b411b363SPhilipp Reisner D_ASSERT(hlist_unhashed(&e->colision)); 383b411b363SPhilipp Reisner mempool_free(e, drbd_ee_mempool); 384b411b363SPhilipp Reisner } 385b411b363SPhilipp Reisner 386b411b363SPhilipp Reisner int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list) 387b411b363SPhilipp Reisner { 388b411b363SPhilipp Reisner LIST_HEAD(work_list); 389b411b363SPhilipp Reisner struct drbd_epoch_entry *e, *t; 390b411b363SPhilipp Reisner int count = 0; 391b411b363SPhilipp Reisner 392b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 393b411b363SPhilipp Reisner list_splice_init(list, &work_list); 394b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 395b411b363SPhilipp Reisner 396b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &work_list, w.list) { 397b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 398b411b363SPhilipp Reisner count++; 399b411b363SPhilipp Reisner } 400b411b363SPhilipp Reisner return count; 401b411b363SPhilipp Reisner } 402b411b363SPhilipp Reisner 403b411b363SPhilipp Reisner 404b411b363SPhilipp Reisner /* 405b411b363SPhilipp Reisner * This function is called from _asender only_ 406b411b363SPhilipp Reisner * but see also comments in _req_mod(,barrier_acked) 407b411b363SPhilipp Reisner * and receive_Barrier. 408b411b363SPhilipp Reisner * 409b411b363SPhilipp Reisner * Move entries from net_ee to done_ee, if ready. 410b411b363SPhilipp Reisner * Grab done_ee, call all callbacks, free the entries. 411b411b363SPhilipp Reisner * The callbacks typically send out ACKs. 412b411b363SPhilipp Reisner */ 413b411b363SPhilipp Reisner static int drbd_process_done_ee(struct drbd_conf *mdev) 414b411b363SPhilipp Reisner { 415b411b363SPhilipp Reisner LIST_HEAD(work_list); 416b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 417b411b363SPhilipp Reisner struct drbd_epoch_entry *e, *t; 418b411b363SPhilipp Reisner int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS); 419b411b363SPhilipp Reisner 420b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 421b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 422b411b363SPhilipp Reisner list_splice_init(&mdev->done_ee, &work_list); 423b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 424b411b363SPhilipp Reisner 425b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &reclaimed, w.list) 426b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 427b411b363SPhilipp Reisner 428b411b363SPhilipp Reisner /* possible callbacks here: 429b411b363SPhilipp Reisner * e_end_block, and e_end_resync_block, e_send_discard_ack. 430b411b363SPhilipp Reisner * all ignore the last argument. 431b411b363SPhilipp Reisner */ 432b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &work_list, w.list) { 433b411b363SPhilipp Reisner /* list_del not necessary, next/prev members not touched */ 434b411b363SPhilipp Reisner ok = e->w.cb(mdev, &e->w, !ok) && ok; 435b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 436b411b363SPhilipp Reisner } 437b411b363SPhilipp Reisner wake_up(&mdev->ee_wait); 438b411b363SPhilipp Reisner 439b411b363SPhilipp Reisner return ok; 440b411b363SPhilipp Reisner } 441b411b363SPhilipp Reisner 442b411b363SPhilipp Reisner void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 443b411b363SPhilipp Reisner { 444b411b363SPhilipp Reisner DEFINE_WAIT(wait); 445b411b363SPhilipp Reisner 446b411b363SPhilipp Reisner /* avoids spin_lock/unlock 447b411b363SPhilipp Reisner * and calling prepare_to_wait in the fast path */ 448b411b363SPhilipp Reisner while (!list_empty(head)) { 449b411b363SPhilipp Reisner prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); 450b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 451b411b363SPhilipp Reisner drbd_kick_lo(mdev); 452b411b363SPhilipp Reisner schedule(); 453b411b363SPhilipp Reisner finish_wait(&mdev->ee_wait, &wait); 454b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 455b411b363SPhilipp Reisner } 456b411b363SPhilipp Reisner } 457b411b363SPhilipp Reisner 458b411b363SPhilipp Reisner void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 459b411b363SPhilipp Reisner { 460b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 461b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, head); 462b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 463b411b363SPhilipp Reisner } 464b411b363SPhilipp Reisner 465b411b363SPhilipp Reisner /* see also kernel_accept; which is only present since 2.6.18. 466b411b363SPhilipp Reisner * also we want to log which part of it failed, exactly */ 467b411b363SPhilipp Reisner static int drbd_accept(struct drbd_conf *mdev, const char **what, 468b411b363SPhilipp Reisner struct socket *sock, struct socket **newsock) 469b411b363SPhilipp Reisner { 470b411b363SPhilipp Reisner struct sock *sk = sock->sk; 471b411b363SPhilipp Reisner int err = 0; 472b411b363SPhilipp Reisner 473b411b363SPhilipp Reisner *what = "listen"; 474b411b363SPhilipp Reisner err = sock->ops->listen(sock, 5); 475b411b363SPhilipp Reisner if (err < 0) 476b411b363SPhilipp Reisner goto out; 477b411b363SPhilipp Reisner 478b411b363SPhilipp Reisner *what = "sock_create_lite"; 479b411b363SPhilipp Reisner err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 480b411b363SPhilipp Reisner newsock); 481b411b363SPhilipp Reisner if (err < 0) 482b411b363SPhilipp Reisner goto out; 483b411b363SPhilipp Reisner 484b411b363SPhilipp Reisner *what = "accept"; 485b411b363SPhilipp Reisner err = sock->ops->accept(sock, *newsock, 0); 486b411b363SPhilipp Reisner if (err < 0) { 487b411b363SPhilipp Reisner sock_release(*newsock); 488b411b363SPhilipp Reisner *newsock = NULL; 489b411b363SPhilipp Reisner goto out; 490b411b363SPhilipp Reisner } 491b411b363SPhilipp Reisner (*newsock)->ops = sock->ops; 492b411b363SPhilipp Reisner 493b411b363SPhilipp Reisner out: 494b411b363SPhilipp Reisner return err; 495b411b363SPhilipp Reisner } 496b411b363SPhilipp Reisner 497b411b363SPhilipp Reisner static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock, 498b411b363SPhilipp Reisner void *buf, size_t size, int flags) 499b411b363SPhilipp Reisner { 500b411b363SPhilipp Reisner mm_segment_t oldfs; 501b411b363SPhilipp Reisner struct kvec iov = { 502b411b363SPhilipp Reisner .iov_base = buf, 503b411b363SPhilipp Reisner .iov_len = size, 504b411b363SPhilipp Reisner }; 505b411b363SPhilipp Reisner struct msghdr msg = { 506b411b363SPhilipp Reisner .msg_iovlen = 1, 507b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 508b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 509b411b363SPhilipp Reisner }; 510b411b363SPhilipp Reisner int rv; 511b411b363SPhilipp Reisner 512b411b363SPhilipp Reisner oldfs = get_fs(); 513b411b363SPhilipp Reisner set_fs(KERNEL_DS); 514b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 515b411b363SPhilipp Reisner set_fs(oldfs); 516b411b363SPhilipp Reisner 517b411b363SPhilipp Reisner return rv; 518b411b363SPhilipp Reisner } 519b411b363SPhilipp Reisner 520b411b363SPhilipp Reisner static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size) 521b411b363SPhilipp Reisner { 522b411b363SPhilipp Reisner mm_segment_t oldfs; 523b411b363SPhilipp Reisner struct kvec iov = { 524b411b363SPhilipp Reisner .iov_base = buf, 525b411b363SPhilipp Reisner .iov_len = size, 526b411b363SPhilipp Reisner }; 527b411b363SPhilipp Reisner struct msghdr msg = { 528b411b363SPhilipp Reisner .msg_iovlen = 1, 529b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 530b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 531b411b363SPhilipp Reisner }; 532b411b363SPhilipp Reisner int rv; 533b411b363SPhilipp Reisner 534b411b363SPhilipp Reisner oldfs = get_fs(); 535b411b363SPhilipp Reisner set_fs(KERNEL_DS); 536b411b363SPhilipp Reisner 537b411b363SPhilipp Reisner for (;;) { 538b411b363SPhilipp Reisner rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags); 539b411b363SPhilipp Reisner if (rv == size) 540b411b363SPhilipp Reisner break; 541b411b363SPhilipp Reisner 542b411b363SPhilipp Reisner /* Note: 543b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 544b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 545b411b363SPhilipp Reisner */ 546b411b363SPhilipp Reisner 547b411b363SPhilipp Reisner if (rv < 0) { 548b411b363SPhilipp Reisner if (rv == -ECONNRESET) 549b411b363SPhilipp Reisner dev_info(DEV, "sock was reset by peer\n"); 550b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 551b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 552b411b363SPhilipp Reisner break; 553b411b363SPhilipp Reisner } else if (rv == 0) { 554b411b363SPhilipp Reisner dev_info(DEV, "sock was shut down by peer\n"); 555b411b363SPhilipp Reisner break; 556b411b363SPhilipp Reisner } else { 557b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 558b411b363SPhilipp Reisner * after we read a partial message 559b411b363SPhilipp Reisner */ 560b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 561b411b363SPhilipp Reisner break; 562b411b363SPhilipp Reisner } 563b411b363SPhilipp Reisner }; 564b411b363SPhilipp Reisner 565b411b363SPhilipp Reisner set_fs(oldfs); 566b411b363SPhilipp Reisner 567b411b363SPhilipp Reisner if (rv != size) 568b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); 569b411b363SPhilipp Reisner 570b411b363SPhilipp Reisner return rv; 571b411b363SPhilipp Reisner } 572b411b363SPhilipp Reisner 5735dbf1673SLars Ellenberg /* quoting tcp(7): 5745dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5755dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5765dbf1673SLars Ellenberg * This is our wrapper to do so. 5775dbf1673SLars Ellenberg */ 5785dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 5795dbf1673SLars Ellenberg unsigned int rcv) 5805dbf1673SLars Ellenberg { 5815dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 5825dbf1673SLars Ellenberg if (snd) { 5835dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 5845dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 5855dbf1673SLars Ellenberg } 5865dbf1673SLars Ellenberg if (rcv) { 5875dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 5885dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 5895dbf1673SLars Ellenberg } 5905dbf1673SLars Ellenberg } 5915dbf1673SLars Ellenberg 592b411b363SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_conf *mdev) 593b411b363SPhilipp Reisner { 594b411b363SPhilipp Reisner const char *what; 595b411b363SPhilipp Reisner struct socket *sock; 596b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 597b411b363SPhilipp Reisner int err; 598b411b363SPhilipp Reisner int disconnect_on_error = 1; 599b411b363SPhilipp Reisner 600b411b363SPhilipp Reisner if (!get_net_conf(mdev)) 601b411b363SPhilipp Reisner return NULL; 602b411b363SPhilipp Reisner 603b411b363SPhilipp Reisner what = "sock_create_kern"; 604b411b363SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, 605b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 606b411b363SPhilipp Reisner if (err < 0) { 607b411b363SPhilipp Reisner sock = NULL; 608b411b363SPhilipp Reisner goto out; 609b411b363SPhilipp Reisner } 610b411b363SPhilipp Reisner 611b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 612b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ; 6135dbf1673SLars Ellenberg drbd_setbufsize(sock, mdev->net_conf->sndbuf_size, 6145dbf1673SLars Ellenberg mdev->net_conf->rcvbuf_size); 615b411b363SPhilipp Reisner 616b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 617b411b363SPhilipp Reisner * for the outgoing connections. 618b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 619b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 620b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 621b411b363SPhilipp Reisner * a free one dynamically. 622b411b363SPhilipp Reisner */ 623b411b363SPhilipp Reisner memcpy(&src_in6, mdev->net_conf->my_addr, 624b411b363SPhilipp Reisner min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6))); 625b411b363SPhilipp Reisner if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6) 626b411b363SPhilipp Reisner src_in6.sin6_port = 0; 627b411b363SPhilipp Reisner else 628b411b363SPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 629b411b363SPhilipp Reisner 630b411b363SPhilipp Reisner what = "bind before connect"; 631b411b363SPhilipp Reisner err = sock->ops->bind(sock, 632b411b363SPhilipp Reisner (struct sockaddr *) &src_in6, 633b411b363SPhilipp Reisner mdev->net_conf->my_addr_len); 634b411b363SPhilipp Reisner if (err < 0) 635b411b363SPhilipp Reisner goto out; 636b411b363SPhilipp Reisner 637b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 638b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 639b411b363SPhilipp Reisner disconnect_on_error = 0; 640b411b363SPhilipp Reisner what = "connect"; 641b411b363SPhilipp Reisner err = sock->ops->connect(sock, 642b411b363SPhilipp Reisner (struct sockaddr *)mdev->net_conf->peer_addr, 643b411b363SPhilipp Reisner mdev->net_conf->peer_addr_len, 0); 644b411b363SPhilipp Reisner 645b411b363SPhilipp Reisner out: 646b411b363SPhilipp Reisner if (err < 0) { 647b411b363SPhilipp Reisner if (sock) { 648b411b363SPhilipp Reisner sock_release(sock); 649b411b363SPhilipp Reisner sock = NULL; 650b411b363SPhilipp Reisner } 651b411b363SPhilipp Reisner switch (-err) { 652b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 653b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 654b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 655b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 656b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 657b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 658b411b363SPhilipp Reisner disconnect_on_error = 0; 659b411b363SPhilipp Reisner break; 660b411b363SPhilipp Reisner default: 661b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 662b411b363SPhilipp Reisner } 663b411b363SPhilipp Reisner if (disconnect_on_error) 664b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 665b411b363SPhilipp Reisner } 666b411b363SPhilipp Reisner put_net_conf(mdev); 667b411b363SPhilipp Reisner return sock; 668b411b363SPhilipp Reisner } 669b411b363SPhilipp Reisner 670b411b363SPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev) 671b411b363SPhilipp Reisner { 672b411b363SPhilipp Reisner int timeo, err; 673b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 674b411b363SPhilipp Reisner const char *what; 675b411b363SPhilipp Reisner 676b411b363SPhilipp Reisner if (!get_net_conf(mdev)) 677b411b363SPhilipp Reisner return NULL; 678b411b363SPhilipp Reisner 679b411b363SPhilipp Reisner what = "sock_create_kern"; 680b411b363SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, 681b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 682b411b363SPhilipp Reisner if (err) { 683b411b363SPhilipp Reisner s_listen = NULL; 684b411b363SPhilipp Reisner goto out; 685b411b363SPhilipp Reisner } 686b411b363SPhilipp Reisner 687b411b363SPhilipp Reisner timeo = mdev->net_conf->try_connect_int * HZ; 688b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 689b411b363SPhilipp Reisner 690b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 691b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 692b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 6935dbf1673SLars Ellenberg drbd_setbufsize(s_listen, mdev->net_conf->sndbuf_size, 6945dbf1673SLars Ellenberg mdev->net_conf->rcvbuf_size); 695b411b363SPhilipp Reisner 696b411b363SPhilipp Reisner what = "bind before listen"; 697b411b363SPhilipp Reisner err = s_listen->ops->bind(s_listen, 698b411b363SPhilipp Reisner (struct sockaddr *) mdev->net_conf->my_addr, 699b411b363SPhilipp Reisner mdev->net_conf->my_addr_len); 700b411b363SPhilipp Reisner if (err < 0) 701b411b363SPhilipp Reisner goto out; 702b411b363SPhilipp Reisner 703b411b363SPhilipp Reisner err = drbd_accept(mdev, &what, s_listen, &s_estab); 704b411b363SPhilipp Reisner 705b411b363SPhilipp Reisner out: 706b411b363SPhilipp Reisner if (s_listen) 707b411b363SPhilipp Reisner sock_release(s_listen); 708b411b363SPhilipp Reisner if (err < 0) { 709b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 710b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 711b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 712b411b363SPhilipp Reisner } 713b411b363SPhilipp Reisner } 714b411b363SPhilipp Reisner put_net_conf(mdev); 715b411b363SPhilipp Reisner 716b411b363SPhilipp Reisner return s_estab; 717b411b363SPhilipp Reisner } 718b411b363SPhilipp Reisner 719b411b363SPhilipp Reisner static int drbd_send_fp(struct drbd_conf *mdev, 720b411b363SPhilipp Reisner struct socket *sock, enum drbd_packets cmd) 721b411b363SPhilipp Reisner { 722b411b363SPhilipp Reisner struct p_header *h = (struct p_header *) &mdev->data.sbuf.header; 723b411b363SPhilipp Reisner 724b411b363SPhilipp Reisner return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0); 725b411b363SPhilipp Reisner } 726b411b363SPhilipp Reisner 727b411b363SPhilipp Reisner static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock) 728b411b363SPhilipp Reisner { 729b411b363SPhilipp Reisner struct p_header *h = (struct p_header *) &mdev->data.sbuf.header; 730b411b363SPhilipp Reisner int rr; 731b411b363SPhilipp Reisner 732b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0); 733b411b363SPhilipp Reisner 734b411b363SPhilipp Reisner if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC) 735b411b363SPhilipp Reisner return be16_to_cpu(h->command); 736b411b363SPhilipp Reisner 737b411b363SPhilipp Reisner return 0xffff; 738b411b363SPhilipp Reisner } 739b411b363SPhilipp Reisner 740b411b363SPhilipp Reisner /** 741b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 742b411b363SPhilipp Reisner * @mdev: DRBD device. 743b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 744b411b363SPhilipp Reisner */ 745b411b363SPhilipp Reisner static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock) 746b411b363SPhilipp Reisner { 747b411b363SPhilipp Reisner int rr; 748b411b363SPhilipp Reisner char tb[4]; 749b411b363SPhilipp Reisner 750b411b363SPhilipp Reisner if (!*sock) 751b411b363SPhilipp Reisner return FALSE; 752b411b363SPhilipp Reisner 753b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 754b411b363SPhilipp Reisner 755b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 756b411b363SPhilipp Reisner return TRUE; 757b411b363SPhilipp Reisner } else { 758b411b363SPhilipp Reisner sock_release(*sock); 759b411b363SPhilipp Reisner *sock = NULL; 760b411b363SPhilipp Reisner return FALSE; 761b411b363SPhilipp Reisner } 762b411b363SPhilipp Reisner } 763b411b363SPhilipp Reisner 764b411b363SPhilipp Reisner /* 765b411b363SPhilipp Reisner * return values: 766b411b363SPhilipp Reisner * 1 yes, we have a valid connection 767b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 768b411b363SPhilipp Reisner * -1 peer talks different language, 769b411b363SPhilipp Reisner * no point in trying again, please go standalone. 770b411b363SPhilipp Reisner * -2 We do not have a network config... 771b411b363SPhilipp Reisner */ 772b411b363SPhilipp Reisner static int drbd_connect(struct drbd_conf *mdev) 773b411b363SPhilipp Reisner { 774b411b363SPhilipp Reisner struct socket *s, *sock, *msock; 775b411b363SPhilipp Reisner int try, h, ok; 776b411b363SPhilipp Reisner 777b411b363SPhilipp Reisner D_ASSERT(!mdev->data.socket); 778b411b363SPhilipp Reisner 779b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS) 780b411b363SPhilipp Reisner return -2; 781b411b363SPhilipp Reisner 782b411b363SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &mdev->flags); 783b411b363SPhilipp Reisner 784b411b363SPhilipp Reisner sock = NULL; 785b411b363SPhilipp Reisner msock = NULL; 786b411b363SPhilipp Reisner 787b411b363SPhilipp Reisner do { 788b411b363SPhilipp Reisner for (try = 0;;) { 789b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 790b411b363SPhilipp Reisner s = drbd_try_connect(mdev); 791b411b363SPhilipp Reisner if (s || ++try >= 3) 792b411b363SPhilipp Reisner break; 793b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 794b411b363SPhilipp Reisner __set_current_state(TASK_INTERRUPTIBLE); 795b411b363SPhilipp Reisner schedule_timeout(HZ / 10); 796b411b363SPhilipp Reisner } 797b411b363SPhilipp Reisner 798b411b363SPhilipp Reisner if (s) { 799b411b363SPhilipp Reisner if (!sock) { 800b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_S); 801b411b363SPhilipp Reisner sock = s; 802b411b363SPhilipp Reisner s = NULL; 803b411b363SPhilipp Reisner } else if (!msock) { 804b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_M); 805b411b363SPhilipp Reisner msock = s; 806b411b363SPhilipp Reisner s = NULL; 807b411b363SPhilipp Reisner } else { 808b411b363SPhilipp Reisner dev_err(DEV, "Logic error in drbd_connect()\n"); 809b411b363SPhilipp Reisner goto out_release_sockets; 810b411b363SPhilipp Reisner } 811b411b363SPhilipp Reisner } 812b411b363SPhilipp Reisner 813b411b363SPhilipp Reisner if (sock && msock) { 814b411b363SPhilipp Reisner __set_current_state(TASK_INTERRUPTIBLE); 815b411b363SPhilipp Reisner schedule_timeout(HZ / 10); 816b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 817b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 818b411b363SPhilipp Reisner if (ok) 819b411b363SPhilipp Reisner break; 820b411b363SPhilipp Reisner } 821b411b363SPhilipp Reisner 822b411b363SPhilipp Reisner retry: 823b411b363SPhilipp Reisner s = drbd_wait_for_connect(mdev); 824b411b363SPhilipp Reisner if (s) { 825b411b363SPhilipp Reisner try = drbd_recv_fp(mdev, s); 826b411b363SPhilipp Reisner drbd_socket_okay(mdev, &sock); 827b411b363SPhilipp Reisner drbd_socket_okay(mdev, &msock); 828b411b363SPhilipp Reisner switch (try) { 829b411b363SPhilipp Reisner case P_HAND_SHAKE_S: 830b411b363SPhilipp Reisner if (sock) { 831b411b363SPhilipp Reisner dev_warn(DEV, "initial packet S crossed\n"); 832b411b363SPhilipp Reisner sock_release(sock); 833b411b363SPhilipp Reisner } 834b411b363SPhilipp Reisner sock = s; 835b411b363SPhilipp Reisner break; 836b411b363SPhilipp Reisner case P_HAND_SHAKE_M: 837b411b363SPhilipp Reisner if (msock) { 838b411b363SPhilipp Reisner dev_warn(DEV, "initial packet M crossed\n"); 839b411b363SPhilipp Reisner sock_release(msock); 840b411b363SPhilipp Reisner } 841b411b363SPhilipp Reisner msock = s; 842b411b363SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &mdev->flags); 843b411b363SPhilipp Reisner break; 844b411b363SPhilipp Reisner default: 845b411b363SPhilipp Reisner dev_warn(DEV, "Error receiving initial packet\n"); 846b411b363SPhilipp Reisner sock_release(s); 847b411b363SPhilipp Reisner if (random32() & 1) 848b411b363SPhilipp Reisner goto retry; 849b411b363SPhilipp Reisner } 850b411b363SPhilipp Reisner } 851b411b363SPhilipp Reisner 852b411b363SPhilipp Reisner if (mdev->state.conn <= C_DISCONNECTING) 853b411b363SPhilipp Reisner goto out_release_sockets; 854b411b363SPhilipp Reisner if (signal_pending(current)) { 855b411b363SPhilipp Reisner flush_signals(current); 856b411b363SPhilipp Reisner smp_rmb(); 857b411b363SPhilipp Reisner if (get_t_state(&mdev->receiver) == Exiting) 858b411b363SPhilipp Reisner goto out_release_sockets; 859b411b363SPhilipp Reisner } 860b411b363SPhilipp Reisner 861b411b363SPhilipp Reisner if (sock && msock) { 862b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 863b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 864b411b363SPhilipp Reisner if (ok) 865b411b363SPhilipp Reisner break; 866b411b363SPhilipp Reisner } 867b411b363SPhilipp Reisner } while (1); 868b411b363SPhilipp Reisner 869b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 870b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 871b411b363SPhilipp Reisner 872b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 873b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 874b411b363SPhilipp Reisner 875b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 876b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 877b411b363SPhilipp Reisner 878b411b363SPhilipp Reisner /* NOT YET ... 879b411b363SPhilipp Reisner * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 880b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 881b411b363SPhilipp Reisner * first set it to the P_HAND_SHAKE timeout, 882b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 883b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = 884b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10; 885b411b363SPhilipp Reisner 886b411b363SPhilipp Reisner msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 887b411b363SPhilipp Reisner msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 888b411b363SPhilipp Reisner 889b411b363SPhilipp Reisner /* we don't want delays. 890b411b363SPhilipp Reisner * we use TCP_CORK where apropriate, though */ 891b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 892b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 893b411b363SPhilipp Reisner 894b411b363SPhilipp Reisner mdev->data.socket = sock; 895b411b363SPhilipp Reisner mdev->meta.socket = msock; 896b411b363SPhilipp Reisner mdev->last_received = jiffies; 897b411b363SPhilipp Reisner 898b411b363SPhilipp Reisner D_ASSERT(mdev->asender.task == NULL); 899b411b363SPhilipp Reisner 900b411b363SPhilipp Reisner h = drbd_do_handshake(mdev); 901b411b363SPhilipp Reisner if (h <= 0) 902b411b363SPhilipp Reisner return h; 903b411b363SPhilipp Reisner 904b411b363SPhilipp Reisner if (mdev->cram_hmac_tfm) { 905b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 906b10d96cbSJohannes Thoma switch (drbd_do_auth(mdev)) { 907b10d96cbSJohannes Thoma case -1: 908b411b363SPhilipp Reisner dev_err(DEV, "Authentication of peer failed\n"); 909b411b363SPhilipp Reisner return -1; 910b10d96cbSJohannes Thoma case 0: 911b10d96cbSJohannes Thoma dev_err(DEV, "Authentication of peer failed, trying again.\n"); 912b10d96cbSJohannes Thoma return 0; 913b411b363SPhilipp Reisner } 914b411b363SPhilipp Reisner } 915b411b363SPhilipp Reisner 916b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS) 917b411b363SPhilipp Reisner return 0; 918b411b363SPhilipp Reisner 919b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 920b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 921b411b363SPhilipp Reisner 922b411b363SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 923b411b363SPhilipp Reisner mdev->peer_seq = 0; 924b411b363SPhilipp Reisner 925b411b363SPhilipp Reisner drbd_thread_start(&mdev->asender); 926b411b363SPhilipp Reisner 9277e2455c1SPhilipp Reisner if (!drbd_send_protocol(mdev)) 9287e2455c1SPhilipp Reisner return -1; 929b411b363SPhilipp Reisner drbd_send_sync_param(mdev, &mdev->sync_conf); 930e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, 0); 931b411b363SPhilipp Reisner drbd_send_uuids(mdev); 932b411b363SPhilipp Reisner drbd_send_state(mdev); 933b411b363SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 934b411b363SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 935b411b363SPhilipp Reisner 936b411b363SPhilipp Reisner return 1; 937b411b363SPhilipp Reisner 938b411b363SPhilipp Reisner out_release_sockets: 939b411b363SPhilipp Reisner if (sock) 940b411b363SPhilipp Reisner sock_release(sock); 941b411b363SPhilipp Reisner if (msock) 942b411b363SPhilipp Reisner sock_release(msock); 943b411b363SPhilipp Reisner return -1; 944b411b363SPhilipp Reisner } 945b411b363SPhilipp Reisner 946b411b363SPhilipp Reisner static int drbd_recv_header(struct drbd_conf *mdev, struct p_header *h) 947b411b363SPhilipp Reisner { 948b411b363SPhilipp Reisner int r; 949b411b363SPhilipp Reisner 950b411b363SPhilipp Reisner r = drbd_recv(mdev, h, sizeof(*h)); 951b411b363SPhilipp Reisner 952b411b363SPhilipp Reisner if (unlikely(r != sizeof(*h))) { 953b411b363SPhilipp Reisner dev_err(DEV, "short read expecting header on sock: r=%d\n", r); 954b411b363SPhilipp Reisner return FALSE; 955b411b363SPhilipp Reisner }; 956b411b363SPhilipp Reisner h->command = be16_to_cpu(h->command); 957b411b363SPhilipp Reisner h->length = be16_to_cpu(h->length); 958b411b363SPhilipp Reisner if (unlikely(h->magic != BE_DRBD_MAGIC)) { 959b411b363SPhilipp Reisner dev_err(DEV, "magic?? on data m: 0x%lx c: %d l: %d\n", 960b411b363SPhilipp Reisner (long)be32_to_cpu(h->magic), 961b411b363SPhilipp Reisner h->command, h->length); 962b411b363SPhilipp Reisner return FALSE; 963b411b363SPhilipp Reisner } 964b411b363SPhilipp Reisner mdev->last_received = jiffies; 965b411b363SPhilipp Reisner 966b411b363SPhilipp Reisner return TRUE; 967b411b363SPhilipp Reisner } 968b411b363SPhilipp Reisner 969b411b363SPhilipp Reisner static enum finish_epoch drbd_flush_after_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch) 970b411b363SPhilipp Reisner { 971b411b363SPhilipp Reisner int rv; 972b411b363SPhilipp Reisner 973b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 974fbd9b09aSDmitry Monakhov rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, 975fbd9b09aSDmitry Monakhov NULL, BLKDEV_IFL_WAIT); 976b411b363SPhilipp Reisner if (rv) { 977b411b363SPhilipp Reisner dev_err(DEV, "local disk flush failed with status %d\n", rv); 978b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 979b411b363SPhilipp Reisner * don't try again for ANY return value != 0 980b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 981b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 982b411b363SPhilipp Reisner } 983b411b363SPhilipp Reisner put_ldev(mdev); 984b411b363SPhilipp Reisner } 985b411b363SPhilipp Reisner 986b411b363SPhilipp Reisner return drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE); 987b411b363SPhilipp Reisner } 988b411b363SPhilipp Reisner 989b411b363SPhilipp Reisner static int w_flush(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 990b411b363SPhilipp Reisner { 991b411b363SPhilipp Reisner struct flush_work *fw = (struct flush_work *)w; 992b411b363SPhilipp Reisner struct drbd_epoch *epoch = fw->epoch; 993b411b363SPhilipp Reisner 994b411b363SPhilipp Reisner kfree(w); 995b411b363SPhilipp Reisner 996b411b363SPhilipp Reisner if (!test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags)) 997b411b363SPhilipp Reisner drbd_flush_after_epoch(mdev, epoch); 998b411b363SPhilipp Reisner 999b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, epoch, EV_PUT | 1000b411b363SPhilipp Reisner (mdev->state.conn < C_CONNECTED ? EV_CLEANUP : 0)); 1001b411b363SPhilipp Reisner 1002b411b363SPhilipp Reisner return 1; 1003b411b363SPhilipp Reisner } 1004b411b363SPhilipp Reisner 1005b411b363SPhilipp Reisner /** 1006b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 1007b411b363SPhilipp Reisner * @mdev: DRBD device. 1008b411b363SPhilipp Reisner * @epoch: Epoch object. 1009b411b363SPhilipp Reisner * @ev: Epoch event. 1010b411b363SPhilipp Reisner */ 1011b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 1012b411b363SPhilipp Reisner struct drbd_epoch *epoch, 1013b411b363SPhilipp Reisner enum epoch_event ev) 1014b411b363SPhilipp Reisner { 1015b411b363SPhilipp Reisner int finish, epoch_size; 1016b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 1017b411b363SPhilipp Reisner int schedule_flush = 0; 1018b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 1019b411b363SPhilipp Reisner 1020b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1021b411b363SPhilipp Reisner do { 1022b411b363SPhilipp Reisner next_epoch = NULL; 1023b411b363SPhilipp Reisner finish = 0; 1024b411b363SPhilipp Reisner 1025b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 1026b411b363SPhilipp Reisner 1027b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 1028b411b363SPhilipp Reisner case EV_PUT: 1029b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1030b411b363SPhilipp Reisner break; 1031b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1032b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1033b411b363SPhilipp Reisner 1034b411b363SPhilipp Reisner /* Special case: If we just switched from WO_bio_barrier to 1035b411b363SPhilipp Reisner WO_bdev_flush we should not finish the current epoch */ 1036b411b363SPhilipp Reisner if (test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags) && epoch_size == 1 && 1037b411b363SPhilipp Reisner mdev->write_ordering != WO_bio_barrier && 1038b411b363SPhilipp Reisner epoch == mdev->current_epoch) 1039b411b363SPhilipp Reisner clear_bit(DE_CONTAINS_A_BARRIER, &epoch->flags); 1040b411b363SPhilipp Reisner break; 1041b411b363SPhilipp Reisner case EV_BARRIER_DONE: 1042b411b363SPhilipp Reisner set_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags); 1043b411b363SPhilipp Reisner break; 1044b411b363SPhilipp Reisner case EV_BECAME_LAST: 1045b411b363SPhilipp Reisner /* nothing to do*/ 1046b411b363SPhilipp Reisner break; 1047b411b363SPhilipp Reisner } 1048b411b363SPhilipp Reisner 1049b411b363SPhilipp Reisner if (epoch_size != 0 && 1050b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 1051b411b363SPhilipp Reisner test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) && 1052b411b363SPhilipp Reisner epoch->list.prev == &mdev->current_epoch->list && 1053b411b363SPhilipp Reisner !test_bit(DE_IS_FINISHING, &epoch->flags)) { 1054b411b363SPhilipp Reisner /* Nearly all conditions are met to finish that epoch... */ 1055b411b363SPhilipp Reisner if (test_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags) || 1056b411b363SPhilipp Reisner mdev->write_ordering == WO_none || 1057b411b363SPhilipp Reisner (epoch_size == 1 && test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) || 1058b411b363SPhilipp Reisner ev & EV_CLEANUP) { 1059b411b363SPhilipp Reisner finish = 1; 1060b411b363SPhilipp Reisner set_bit(DE_IS_FINISHING, &epoch->flags); 1061b411b363SPhilipp Reisner } else if (!test_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags) && 1062b411b363SPhilipp Reisner mdev->write_ordering == WO_bio_barrier) { 1063b411b363SPhilipp Reisner atomic_inc(&epoch->active); 1064b411b363SPhilipp Reisner schedule_flush = 1; 1065b411b363SPhilipp Reisner } 1066b411b363SPhilipp Reisner } 1067b411b363SPhilipp Reisner if (finish) { 1068b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1069b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1070b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1071b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1072b411b363SPhilipp Reisner } 1073b411b363SPhilipp Reisner dec_unacked(mdev); 1074b411b363SPhilipp Reisner 1075b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1076b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1077b411b363SPhilipp Reisner list_del(&epoch->list); 1078b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1079b411b363SPhilipp Reisner mdev->epochs--; 1080b411b363SPhilipp Reisner kfree(epoch); 1081b411b363SPhilipp Reisner 1082b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1083b411b363SPhilipp Reisner rv = FE_DESTROYED; 1084b411b363SPhilipp Reisner } else { 1085b411b363SPhilipp Reisner epoch->flags = 0; 1086b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1087698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1088b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1089b411b363SPhilipp Reisner rv = FE_RECYCLED; 1090b411b363SPhilipp Reisner } 1091b411b363SPhilipp Reisner } 1092b411b363SPhilipp Reisner 1093b411b363SPhilipp Reisner if (!next_epoch) 1094b411b363SPhilipp Reisner break; 1095b411b363SPhilipp Reisner 1096b411b363SPhilipp Reisner epoch = next_epoch; 1097b411b363SPhilipp Reisner } while (1); 1098b411b363SPhilipp Reisner 1099b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1100b411b363SPhilipp Reisner 1101b411b363SPhilipp Reisner if (schedule_flush) { 1102b411b363SPhilipp Reisner struct flush_work *fw; 1103b411b363SPhilipp Reisner fw = kmalloc(sizeof(*fw), GFP_ATOMIC); 1104b411b363SPhilipp Reisner if (fw) { 1105b411b363SPhilipp Reisner fw->w.cb = w_flush; 1106b411b363SPhilipp Reisner fw->epoch = epoch; 1107b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, &fw->w); 1108b411b363SPhilipp Reisner } else { 1109b411b363SPhilipp Reisner dev_warn(DEV, "Could not kmalloc a flush_work obj\n"); 1110b411b363SPhilipp Reisner set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags); 1111b411b363SPhilipp Reisner /* That is not a recursion, only one level */ 1112b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE); 1113b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, epoch, EV_PUT); 1114b411b363SPhilipp Reisner } 1115b411b363SPhilipp Reisner } 1116b411b363SPhilipp Reisner 1117b411b363SPhilipp Reisner return rv; 1118b411b363SPhilipp Reisner } 1119b411b363SPhilipp Reisner 1120b411b363SPhilipp Reisner /** 1121b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1122b411b363SPhilipp Reisner * @mdev: DRBD device. 1123b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1124b411b363SPhilipp Reisner */ 1125b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1126b411b363SPhilipp Reisner { 1127b411b363SPhilipp Reisner enum write_ordering_e pwo; 1128b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1129b411b363SPhilipp Reisner [WO_none] = "none", 1130b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1131b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1132b411b363SPhilipp Reisner [WO_bio_barrier] = "barrier", 1133b411b363SPhilipp Reisner }; 1134b411b363SPhilipp Reisner 1135b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1136b411b363SPhilipp Reisner wo = min(pwo, wo); 1137b411b363SPhilipp Reisner if (wo == WO_bio_barrier && mdev->ldev->dc.no_disk_barrier) 1138b411b363SPhilipp Reisner wo = WO_bdev_flush; 1139b411b363SPhilipp Reisner if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) 1140b411b363SPhilipp Reisner wo = WO_drain_io; 1141b411b363SPhilipp Reisner if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) 1142b411b363SPhilipp Reisner wo = WO_none; 1143b411b363SPhilipp Reisner mdev->write_ordering = wo; 1144b411b363SPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bio_barrier) 1145b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1146b411b363SPhilipp Reisner } 1147b411b363SPhilipp Reisner 1148b411b363SPhilipp Reisner /** 114945bb912bSLars Ellenberg * drbd_submit_ee() 115045bb912bSLars Ellenberg * @mdev: DRBD device. 115145bb912bSLars Ellenberg * @e: epoch entry 115245bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 115345bb912bSLars Ellenberg */ 115445bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 115545bb912bSLars Ellenberg int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, 115645bb912bSLars Ellenberg const unsigned rw, const int fault_type) 115745bb912bSLars Ellenberg { 115845bb912bSLars Ellenberg struct bio *bios = NULL; 115945bb912bSLars Ellenberg struct bio *bio; 116045bb912bSLars Ellenberg struct page *page = e->pages; 116145bb912bSLars Ellenberg sector_t sector = e->sector; 116245bb912bSLars Ellenberg unsigned ds = e->size; 116345bb912bSLars Ellenberg unsigned n_bios = 0; 116445bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 116545bb912bSLars Ellenberg 116645bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 116745bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 116845bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 116945bb912bSLars Ellenberg * request in more than one bio. */ 117045bb912bSLars Ellenberg next_bio: 117145bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 117245bb912bSLars Ellenberg if (!bio) { 117345bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 117445bb912bSLars Ellenberg goto fail; 117545bb912bSLars Ellenberg } 117645bb912bSLars Ellenberg /* > e->sector, unless this is the first bio */ 117745bb912bSLars Ellenberg bio->bi_sector = sector; 117845bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 117945bb912bSLars Ellenberg /* we special case some flags in the multi-bio case, see below 11807b6d91daSChristoph Hellwig * (REQ_UNPLUG, REQ_HARDBARRIER) */ 118145bb912bSLars Ellenberg bio->bi_rw = rw; 118245bb912bSLars Ellenberg bio->bi_private = e; 118345bb912bSLars Ellenberg bio->bi_end_io = drbd_endio_sec; 118445bb912bSLars Ellenberg 118545bb912bSLars Ellenberg bio->bi_next = bios; 118645bb912bSLars Ellenberg bios = bio; 118745bb912bSLars Ellenberg ++n_bios; 118845bb912bSLars Ellenberg 118945bb912bSLars Ellenberg page_chain_for_each(page) { 119045bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 119145bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 119245bb912bSLars Ellenberg /* a single page must always be possible! */ 119345bb912bSLars Ellenberg BUG_ON(bio->bi_vcnt == 0); 119445bb912bSLars Ellenberg goto next_bio; 119545bb912bSLars Ellenberg } 119645bb912bSLars Ellenberg ds -= len; 119745bb912bSLars Ellenberg sector += len >> 9; 119845bb912bSLars Ellenberg --nr_pages; 119945bb912bSLars Ellenberg } 120045bb912bSLars Ellenberg D_ASSERT(page == NULL); 120145bb912bSLars Ellenberg D_ASSERT(ds == 0); 120245bb912bSLars Ellenberg 120345bb912bSLars Ellenberg atomic_set(&e->pending_bios, n_bios); 120445bb912bSLars Ellenberg do { 120545bb912bSLars Ellenberg bio = bios; 120645bb912bSLars Ellenberg bios = bios->bi_next; 120745bb912bSLars Ellenberg bio->bi_next = NULL; 120845bb912bSLars Ellenberg 12097b6d91daSChristoph Hellwig /* strip off REQ_UNPLUG unless it is the last bio */ 121045bb912bSLars Ellenberg if (bios) 12117b6d91daSChristoph Hellwig bio->bi_rw &= ~REQ_UNPLUG; 121245bb912bSLars Ellenberg 121345bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 121445bb912bSLars Ellenberg 12157b6d91daSChristoph Hellwig /* strip off REQ_HARDBARRIER, 121645bb912bSLars Ellenberg * unless it is the first or last bio */ 121745bb912bSLars Ellenberg if (bios && bios->bi_next) 12187b6d91daSChristoph Hellwig bios->bi_rw &= ~REQ_HARDBARRIER; 121945bb912bSLars Ellenberg } while (bios); 122045bb912bSLars Ellenberg maybe_kick_lo(mdev); 122145bb912bSLars Ellenberg return 0; 122245bb912bSLars Ellenberg 122345bb912bSLars Ellenberg fail: 122445bb912bSLars Ellenberg while (bios) { 122545bb912bSLars Ellenberg bio = bios; 122645bb912bSLars Ellenberg bios = bios->bi_next; 122745bb912bSLars Ellenberg bio_put(bio); 122845bb912bSLars Ellenberg } 122945bb912bSLars Ellenberg return -ENOMEM; 123045bb912bSLars Ellenberg } 123145bb912bSLars Ellenberg 123245bb912bSLars Ellenberg /** 12337b6d91daSChristoph Hellwig * w_e_reissue() - Worker callback; Resubmit a bio, without REQ_HARDBARRIER set 1234b411b363SPhilipp Reisner * @mdev: DRBD device. 1235b411b363SPhilipp Reisner * @w: work object. 1236b411b363SPhilipp Reisner * @cancel: The connection will be closed anyways (unused in this callback) 1237b411b363SPhilipp Reisner */ 1238b411b363SPhilipp Reisner int w_e_reissue(struct drbd_conf *mdev, struct drbd_work *w, int cancel) __releases(local) 1239b411b363SPhilipp Reisner { 1240b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1241b411b363SPhilipp Reisner /* We leave DE_CONTAINS_A_BARRIER and EE_IS_BARRIER in place, 1242b411b363SPhilipp Reisner (and DE_BARRIER_IN_NEXT_EPOCH_ISSUED in the previous Epoch) 1243b411b363SPhilipp Reisner so that we can finish that epoch in drbd_may_finish_epoch(). 1244b411b363SPhilipp Reisner That is necessary if we already have a long chain of Epochs, before 12457b6d91daSChristoph Hellwig we realize that REQ_HARDBARRIER is actually not supported */ 1246b411b363SPhilipp Reisner 1247b411b363SPhilipp Reisner /* As long as the -ENOTSUPP on the barrier is reported immediately 1248b411b363SPhilipp Reisner that will never trigger. If it is reported late, we will just 1249b411b363SPhilipp Reisner print that warning and continue correctly for all future requests 1250b411b363SPhilipp Reisner with WO_bdev_flush */ 1251b411b363SPhilipp Reisner if (previous_epoch(mdev, e->epoch)) 1252b411b363SPhilipp Reisner dev_warn(DEV, "Write ordering was not enforced (one time event)\n"); 1253b411b363SPhilipp Reisner 1254b411b363SPhilipp Reisner /* we still have a local reference, 1255b411b363SPhilipp Reisner * get_ldev was done in receive_Data. */ 1256b411b363SPhilipp Reisner 1257b411b363SPhilipp Reisner e->w.cb = e_end_block; 125845bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_DT_WR) != 0) { 125945bb912bSLars Ellenberg /* drbd_submit_ee fails for one reason only: 126045bb912bSLars Ellenberg * if was not able to allocate sufficient bios. 126145bb912bSLars Ellenberg * requeue, try again later. */ 126245bb912bSLars Ellenberg e->w.cb = w_e_reissue; 126345bb912bSLars Ellenberg drbd_queue_work(&mdev->data.work, &e->w); 126445bb912bSLars Ellenberg } 1265b411b363SPhilipp Reisner return 1; 1266b411b363SPhilipp Reisner } 1267b411b363SPhilipp Reisner 1268b411b363SPhilipp Reisner static int receive_Barrier(struct drbd_conf *mdev, struct p_header *h) 1269b411b363SPhilipp Reisner { 1270b411b363SPhilipp Reisner int rv, issue_flush; 1271b411b363SPhilipp Reisner struct p_barrier *p = (struct p_barrier *)h; 1272b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1273b411b363SPhilipp Reisner 1274b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; 1275b411b363SPhilipp Reisner 1276b411b363SPhilipp Reisner rv = drbd_recv(mdev, h->payload, h->length); 1277b411b363SPhilipp Reisner ERR_IF(rv != h->length) return FALSE; 1278b411b363SPhilipp Reisner 1279b411b363SPhilipp Reisner inc_unacked(mdev); 1280b411b363SPhilipp Reisner 1281b411b363SPhilipp Reisner if (mdev->net_conf->wire_protocol != DRBD_PROT_C) 1282b411b363SPhilipp Reisner drbd_kick_lo(mdev); 1283b411b363SPhilipp Reisner 1284b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1285b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1286b411b363SPhilipp Reisner 1287b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1288b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1289b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1290b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1291b411b363SPhilipp Reisner * completed. */ 1292b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1293b411b363SPhilipp Reisner case WO_bio_barrier: 1294b411b363SPhilipp Reisner case WO_none: 1295b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 1296b411b363SPhilipp Reisner return TRUE; 1297b411b363SPhilipp Reisner break; 1298b411b363SPhilipp Reisner 1299b411b363SPhilipp Reisner case WO_bdev_flush: 1300b411b363SPhilipp Reisner case WO_drain_io: 1301367a8d73SPhilipp Reisner if (rv == FE_STILL_LIVE) { 1302b411b363SPhilipp Reisner set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags); 1303b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 1304b411b363SPhilipp Reisner rv = drbd_flush_after_epoch(mdev, mdev->current_epoch); 1305367a8d73SPhilipp Reisner } 1306b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 1307b411b363SPhilipp Reisner return TRUE; 1308b411b363SPhilipp Reisner 1309b411b363SPhilipp Reisner /* The asender will send all the ACKs and barrier ACKs out, since 1310b411b363SPhilipp Reisner all EEs moved from the active_ee to the done_ee. We need to 1311b411b363SPhilipp Reisner provide a new epoch object for the EEs that come in soon */ 1312b411b363SPhilipp Reisner break; 1313b411b363SPhilipp Reisner } 1314b411b363SPhilipp Reisner 1315b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1316b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1317b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 1318b411b363SPhilipp Reisner if (!epoch) { 1319b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 1320d3db7b48SDan Carpenter issue_flush = !test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags); 1321b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 1322b411b363SPhilipp Reisner if (issue_flush) { 1323b411b363SPhilipp Reisner rv = drbd_flush_after_epoch(mdev, mdev->current_epoch); 1324b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 1325b411b363SPhilipp Reisner return TRUE; 1326b411b363SPhilipp Reisner } 1327b411b363SPhilipp Reisner 1328b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->done_ee); 1329b411b363SPhilipp Reisner 1330b411b363SPhilipp Reisner return TRUE; 1331b411b363SPhilipp Reisner } 1332b411b363SPhilipp Reisner 1333b411b363SPhilipp Reisner epoch->flags = 0; 1334b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1335b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1336b411b363SPhilipp Reisner 1337b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1338b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1339b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1340b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1341b411b363SPhilipp Reisner mdev->epochs++; 1342b411b363SPhilipp Reisner } else { 1343b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1344b411b363SPhilipp Reisner kfree(epoch); 1345b411b363SPhilipp Reisner } 1346b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1347b411b363SPhilipp Reisner 1348b411b363SPhilipp Reisner return TRUE; 1349b411b363SPhilipp Reisner } 1350b411b363SPhilipp Reisner 1351b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1352b411b363SPhilipp Reisner * and from receive_Data */ 1353b411b363SPhilipp Reisner static struct drbd_epoch_entry * 1354b411b363SPhilipp Reisner read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local) 1355b411b363SPhilipp Reisner { 13566666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1357b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1358b411b363SPhilipp Reisner struct page *page; 135945bb912bSLars Ellenberg int dgs, ds, rr; 1360b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1361b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 13626b4388acSPhilipp Reisner unsigned long *data; 1363b411b363SPhilipp Reisner 1364b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1365b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1366b411b363SPhilipp Reisner 1367b411b363SPhilipp Reisner if (dgs) { 1368b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1369b411b363SPhilipp Reisner if (rr != dgs) { 1370b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data digest: read %d expected %d\n", 1371b411b363SPhilipp Reisner rr, dgs); 1372b411b363SPhilipp Reisner return NULL; 1373b411b363SPhilipp Reisner } 1374b411b363SPhilipp Reisner } 1375b411b363SPhilipp Reisner 1376b411b363SPhilipp Reisner data_size -= dgs; 1377b411b363SPhilipp Reisner 1378b411b363SPhilipp Reisner ERR_IF(data_size & 0x1ff) return NULL; 1379b411b363SPhilipp Reisner ERR_IF(data_size > DRBD_MAX_SEGMENT_SIZE) return NULL; 1380b411b363SPhilipp Reisner 13816666032aSLars Ellenberg /* even though we trust out peer, 13826666032aSLars Ellenberg * we sometimes have to double check. */ 13836666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 13846666032aSLars Ellenberg dev_err(DEV, "capacity: %llus < sector: %llus + size: %u\n", 13856666032aSLars Ellenberg (unsigned long long)capacity, 13866666032aSLars Ellenberg (unsigned long long)sector, data_size); 13876666032aSLars Ellenberg return NULL; 13886666032aSLars Ellenberg } 13896666032aSLars Ellenberg 1390b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1391b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1392b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1393b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); 1394b411b363SPhilipp Reisner if (!e) 1395b411b363SPhilipp Reisner return NULL; 139645bb912bSLars Ellenberg 1397b411b363SPhilipp Reisner ds = data_size; 139845bb912bSLars Ellenberg page = e->pages; 139945bb912bSLars Ellenberg page_chain_for_each(page) { 140045bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 14016b4388acSPhilipp Reisner data = kmap(page); 140245bb912bSLars Ellenberg rr = drbd_recv(mdev, data, len); 14036b4388acSPhilipp Reisner if (FAULT_ACTIVE(mdev, DRBD_FAULT_RECEIVE)) { 14046b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 14056b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 14066b4388acSPhilipp Reisner } 1407b411b363SPhilipp Reisner kunmap(page); 140845bb912bSLars Ellenberg if (rr != len) { 1409b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1410b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 141145bb912bSLars Ellenberg rr, len); 1412b411b363SPhilipp Reisner return NULL; 1413b411b363SPhilipp Reisner } 1414b411b363SPhilipp Reisner ds -= rr; 1415b411b363SPhilipp Reisner } 1416b411b363SPhilipp Reisner 1417b411b363SPhilipp Reisner if (dgs) { 141845bb912bSLars Ellenberg drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv); 1419b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1420b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED.\n"); 1421b411b363SPhilipp Reisner drbd_bcast_ee(mdev, "digest failed", 1422b411b363SPhilipp Reisner dgs, dig_in, dig_vv, e); 1423b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1424b411b363SPhilipp Reisner return NULL; 1425b411b363SPhilipp Reisner } 1426b411b363SPhilipp Reisner } 1427b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1428b411b363SPhilipp Reisner return e; 1429b411b363SPhilipp Reisner } 1430b411b363SPhilipp Reisner 1431b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1432b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1433b411b363SPhilipp Reisner */ 1434b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1435b411b363SPhilipp Reisner { 1436b411b363SPhilipp Reisner struct page *page; 1437b411b363SPhilipp Reisner int rr, rv = 1; 1438b411b363SPhilipp Reisner void *data; 1439b411b363SPhilipp Reisner 1440c3470cdeSLars Ellenberg if (!data_size) 1441c3470cdeSLars Ellenberg return TRUE; 1442c3470cdeSLars Ellenberg 144345bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, 1, 1); 1444b411b363SPhilipp Reisner 1445b411b363SPhilipp Reisner data = kmap(page); 1446b411b363SPhilipp Reisner while (data_size) { 1447b411b363SPhilipp Reisner rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); 1448b411b363SPhilipp Reisner if (rr != min_t(int, data_size, PAGE_SIZE)) { 1449b411b363SPhilipp Reisner rv = 0; 1450b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 1451b411b363SPhilipp Reisner rr, min_t(int, data_size, PAGE_SIZE)); 1452b411b363SPhilipp Reisner break; 1453b411b363SPhilipp Reisner } 1454b411b363SPhilipp Reisner data_size -= rr; 1455b411b363SPhilipp Reisner } 1456b411b363SPhilipp Reisner kunmap(page); 1457b411b363SPhilipp Reisner drbd_pp_free(mdev, page); 1458b411b363SPhilipp Reisner return rv; 1459b411b363SPhilipp Reisner } 1460b411b363SPhilipp Reisner 1461b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1462b411b363SPhilipp Reisner sector_t sector, int data_size) 1463b411b363SPhilipp Reisner { 1464b411b363SPhilipp Reisner struct bio_vec *bvec; 1465b411b363SPhilipp Reisner struct bio *bio; 1466b411b363SPhilipp Reisner int dgs, rr, i, expect; 1467b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1468b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 1469b411b363SPhilipp Reisner 1470b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1471b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1472b411b363SPhilipp Reisner 1473b411b363SPhilipp Reisner if (dgs) { 1474b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1475b411b363SPhilipp Reisner if (rr != dgs) { 1476b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n", 1477b411b363SPhilipp Reisner rr, dgs); 1478b411b363SPhilipp Reisner return 0; 1479b411b363SPhilipp Reisner } 1480b411b363SPhilipp Reisner } 1481b411b363SPhilipp Reisner 1482b411b363SPhilipp Reisner data_size -= dgs; 1483b411b363SPhilipp Reisner 1484b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1485b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1486b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1487b411b363SPhilipp Reisner 1488b411b363SPhilipp Reisner bio = req->master_bio; 1489b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1490b411b363SPhilipp Reisner 1491b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1492b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1493b411b363SPhilipp Reisner rr = drbd_recv(mdev, 1494b411b363SPhilipp Reisner kmap(bvec->bv_page)+bvec->bv_offset, 1495b411b363SPhilipp Reisner expect); 1496b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1497b411b363SPhilipp Reisner if (rr != expect) { 1498b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply: " 1499b411b363SPhilipp Reisner "read %d expected %d\n", 1500b411b363SPhilipp Reisner rr, expect); 1501b411b363SPhilipp Reisner return 0; 1502b411b363SPhilipp Reisner } 1503b411b363SPhilipp Reisner data_size -= rr; 1504b411b363SPhilipp Reisner } 1505b411b363SPhilipp Reisner 1506b411b363SPhilipp Reisner if (dgs) { 150745bb912bSLars Ellenberg drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv); 1508b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1509b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 1510b411b363SPhilipp Reisner return 0; 1511b411b363SPhilipp Reisner } 1512b411b363SPhilipp Reisner } 1513b411b363SPhilipp Reisner 1514b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 1515b411b363SPhilipp Reisner return 1; 1516b411b363SPhilipp Reisner } 1517b411b363SPhilipp Reisner 1518b411b363SPhilipp Reisner /* e_end_resync_block() is called via 1519b411b363SPhilipp Reisner * drbd_process_done_ee() by asender only */ 1520b411b363SPhilipp Reisner static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1521b411b363SPhilipp Reisner { 1522b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1523b411b363SPhilipp Reisner sector_t sector = e->sector; 1524b411b363SPhilipp Reisner int ok; 1525b411b363SPhilipp Reisner 1526b411b363SPhilipp Reisner D_ASSERT(hlist_unhashed(&e->colision)); 1527b411b363SPhilipp Reisner 152845bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1529b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1530b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e); 1531b411b363SPhilipp Reisner } else { 1532b411b363SPhilipp Reisner /* Record failure to sync */ 1533b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, e->size); 1534b411b363SPhilipp Reisner 1535b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1536b411b363SPhilipp Reisner } 1537b411b363SPhilipp Reisner dec_unacked(mdev); 1538b411b363SPhilipp Reisner 1539b411b363SPhilipp Reisner return ok; 1540b411b363SPhilipp Reisner } 1541b411b363SPhilipp Reisner 1542b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1543b411b363SPhilipp Reisner { 1544b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1545b411b363SPhilipp Reisner 1546b411b363SPhilipp Reisner e = read_in_block(mdev, ID_SYNCER, sector, data_size); 154745bb912bSLars Ellenberg if (!e) 154845bb912bSLars Ellenberg goto fail; 1549b411b363SPhilipp Reisner 1550b411b363SPhilipp Reisner dec_rs_pending(mdev); 1551b411b363SPhilipp Reisner 1552b411b363SPhilipp Reisner inc_unacked(mdev); 1553b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1554b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1555b411b363SPhilipp Reisner 155645bb912bSLars Ellenberg e->w.cb = e_end_resync_block; 155745bb912bSLars Ellenberg 1558b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1559b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->sync_ee); 1560b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1561b411b363SPhilipp Reisner 156245bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0) 1563b411b363SPhilipp Reisner return TRUE; 156445bb912bSLars Ellenberg 156545bb912bSLars Ellenberg drbd_free_ee(mdev, e); 156645bb912bSLars Ellenberg fail: 156745bb912bSLars Ellenberg put_ldev(mdev); 156845bb912bSLars Ellenberg return FALSE; 1569b411b363SPhilipp Reisner } 1570b411b363SPhilipp Reisner 1571b411b363SPhilipp Reisner static int receive_DataReply(struct drbd_conf *mdev, struct p_header *h) 1572b411b363SPhilipp Reisner { 1573b411b363SPhilipp Reisner struct drbd_request *req; 1574b411b363SPhilipp Reisner sector_t sector; 1575b411b363SPhilipp Reisner unsigned int header_size, data_size; 1576b411b363SPhilipp Reisner int ok; 1577b411b363SPhilipp Reisner struct p_data *p = (struct p_data *)h; 1578b411b363SPhilipp Reisner 1579b411b363SPhilipp Reisner header_size = sizeof(*p) - sizeof(*h); 1580b411b363SPhilipp Reisner data_size = h->length - header_size; 1581b411b363SPhilipp Reisner 1582b411b363SPhilipp Reisner ERR_IF(data_size == 0) return FALSE; 1583b411b363SPhilipp Reisner 1584b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, header_size) != header_size) 1585b411b363SPhilipp Reisner return FALSE; 1586b411b363SPhilipp Reisner 1587b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1588b411b363SPhilipp Reisner 1589b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1590b411b363SPhilipp Reisner req = _ar_id_to_req(mdev, p->block_id, sector); 1591b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1592b411b363SPhilipp Reisner if (unlikely(!req)) { 1593b411b363SPhilipp Reisner dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n"); 1594b411b363SPhilipp Reisner return FALSE; 1595b411b363SPhilipp Reisner } 1596b411b363SPhilipp Reisner 1597b411b363SPhilipp Reisner /* hlist_del(&req->colision) is done in _req_may_be_done, to avoid 1598b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1599b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1600b411b363SPhilipp Reisner ok = recv_dless_read(mdev, req, sector, data_size); 1601b411b363SPhilipp Reisner 1602b411b363SPhilipp Reisner if (ok) 1603b411b363SPhilipp Reisner req_mod(req, data_received); 1604b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1605b411b363SPhilipp Reisner * I don't think we may complete this just yet 1606b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1607b411b363SPhilipp Reisner 1608b411b363SPhilipp Reisner return ok; 1609b411b363SPhilipp Reisner } 1610b411b363SPhilipp Reisner 1611b411b363SPhilipp Reisner static int receive_RSDataReply(struct drbd_conf *mdev, struct p_header *h) 1612b411b363SPhilipp Reisner { 1613b411b363SPhilipp Reisner sector_t sector; 1614b411b363SPhilipp Reisner unsigned int header_size, data_size; 1615b411b363SPhilipp Reisner int ok; 1616b411b363SPhilipp Reisner struct p_data *p = (struct p_data *)h; 1617b411b363SPhilipp Reisner 1618b411b363SPhilipp Reisner header_size = sizeof(*p) - sizeof(*h); 1619b411b363SPhilipp Reisner data_size = h->length - header_size; 1620b411b363SPhilipp Reisner 1621b411b363SPhilipp Reisner ERR_IF(data_size == 0) return FALSE; 1622b411b363SPhilipp Reisner 1623b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, header_size) != header_size) 1624b411b363SPhilipp Reisner return FALSE; 1625b411b363SPhilipp Reisner 1626b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1627b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1628b411b363SPhilipp Reisner 1629b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1630b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1631b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1632b411b363SPhilipp Reisner * or in drbd_endio_write_sec. */ 1633b411b363SPhilipp Reisner ok = recv_resync_read(mdev, sector, data_size); 1634b411b363SPhilipp Reisner } else { 1635b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1636b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1637b411b363SPhilipp Reisner 1638b411b363SPhilipp Reisner ok = drbd_drain_block(mdev, data_size); 1639b411b363SPhilipp Reisner 1640b411b363SPhilipp Reisner drbd_send_ack_dp(mdev, P_NEG_ACK, p); 1641b411b363SPhilipp Reisner } 1642b411b363SPhilipp Reisner 1643778f271dSPhilipp Reisner atomic_add(data_size >> 9, &mdev->rs_sect_in); 1644778f271dSPhilipp Reisner 1645b411b363SPhilipp Reisner return ok; 1646b411b363SPhilipp Reisner } 1647b411b363SPhilipp Reisner 1648b411b363SPhilipp Reisner /* e_end_block() is called via drbd_process_done_ee(). 1649b411b363SPhilipp Reisner * this means this function only runs in the asender thread 1650b411b363SPhilipp Reisner */ 1651b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1652b411b363SPhilipp Reisner { 1653b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1654b411b363SPhilipp Reisner sector_t sector = e->sector; 1655b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1656b411b363SPhilipp Reisner int ok = 1, pcmd; 1657b411b363SPhilipp Reisner 1658b411b363SPhilipp Reisner if (e->flags & EE_IS_BARRIER) { 1659b411b363SPhilipp Reisner epoch = previous_epoch(mdev, e->epoch); 1660b411b363SPhilipp Reisner if (epoch) 1661b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE + (cancel ? EV_CLEANUP : 0)); 1662b411b363SPhilipp Reisner } 1663b411b363SPhilipp Reisner 1664b411b363SPhilipp Reisner if (mdev->net_conf->wire_protocol == DRBD_PROT_C) { 166545bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1666b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1667b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1668b411b363SPhilipp Reisner e->flags & EE_MAY_SET_IN_SYNC) ? 1669b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 1670b411b363SPhilipp Reisner ok &= drbd_send_ack(mdev, pcmd, e); 1671b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1672b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1673b411b363SPhilipp Reisner } else { 1674b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1675b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1676b411b363SPhilipp Reisner * maybe assert this? */ 1677b411b363SPhilipp Reisner } 1678b411b363SPhilipp Reisner dec_unacked(mdev); 1679b411b363SPhilipp Reisner } 1680b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1681b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 1682b411b363SPhilipp Reisner if (mdev->net_conf->two_primaries) { 1683b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1684b411b363SPhilipp Reisner D_ASSERT(!hlist_unhashed(&e->colision)); 1685b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1686b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1687b411b363SPhilipp Reisner } else { 1688b411b363SPhilipp Reisner D_ASSERT(hlist_unhashed(&e->colision)); 1689b411b363SPhilipp Reisner } 1690b411b363SPhilipp Reisner 1691b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1692b411b363SPhilipp Reisner 1693b411b363SPhilipp Reisner return ok; 1694b411b363SPhilipp Reisner } 1695b411b363SPhilipp Reisner 1696b411b363SPhilipp Reisner static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1697b411b363SPhilipp Reisner { 1698b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1699b411b363SPhilipp Reisner int ok = 1; 1700b411b363SPhilipp Reisner 1701b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1702b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_DISCARD_ACK, e); 1703b411b363SPhilipp Reisner 1704b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1705b411b363SPhilipp Reisner D_ASSERT(!hlist_unhashed(&e->colision)); 1706b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1707b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1708b411b363SPhilipp Reisner 1709b411b363SPhilipp Reisner dec_unacked(mdev); 1710b411b363SPhilipp Reisner 1711b411b363SPhilipp Reisner return ok; 1712b411b363SPhilipp Reisner } 1713b411b363SPhilipp Reisner 1714b411b363SPhilipp Reisner /* Called from receive_Data. 1715b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1716b411b363SPhilipp Reisner * 1717b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1718b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1719b411b363SPhilipp Reisner * been sent. 1720b411b363SPhilipp Reisner * 1721b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1722b411b363SPhilipp Reisner * 1723b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1724b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1725b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1726b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1727b411b363SPhilipp Reisner * 1728b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1729b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1730b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1731b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1732b411b363SPhilipp Reisner * 1733b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1734b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 1735b411b363SPhilipp Reisner static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) 1736b411b363SPhilipp Reisner { 1737b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1738b411b363SPhilipp Reisner unsigned int p_seq; 1739b411b363SPhilipp Reisner long timeout; 1740b411b363SPhilipp Reisner int ret = 0; 1741b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1742b411b363SPhilipp Reisner for (;;) { 1743b411b363SPhilipp Reisner prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1744b411b363SPhilipp Reisner if (seq_le(packet_seq, mdev->peer_seq+1)) 1745b411b363SPhilipp Reisner break; 1746b411b363SPhilipp Reisner if (signal_pending(current)) { 1747b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1748b411b363SPhilipp Reisner break; 1749b411b363SPhilipp Reisner } 1750b411b363SPhilipp Reisner p_seq = mdev->peer_seq; 1751b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1752b411b363SPhilipp Reisner timeout = schedule_timeout(30*HZ); 1753b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1754b411b363SPhilipp Reisner if (timeout == 0 && p_seq == mdev->peer_seq) { 1755b411b363SPhilipp Reisner ret = -ETIMEDOUT; 1756b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); 1757b411b363SPhilipp Reisner break; 1758b411b363SPhilipp Reisner } 1759b411b363SPhilipp Reisner } 1760b411b363SPhilipp Reisner finish_wait(&mdev->seq_wait, &wait); 1761b411b363SPhilipp Reisner if (mdev->peer_seq+1 == packet_seq) 1762b411b363SPhilipp Reisner mdev->peer_seq++; 1763b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1764b411b363SPhilipp Reisner return ret; 1765b411b363SPhilipp Reisner } 1766b411b363SPhilipp Reisner 1767b411b363SPhilipp Reisner /* mirrored write */ 1768b411b363SPhilipp Reisner static int receive_Data(struct drbd_conf *mdev, struct p_header *h) 1769b411b363SPhilipp Reisner { 1770b411b363SPhilipp Reisner sector_t sector; 1771b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1772b411b363SPhilipp Reisner struct p_data *p = (struct p_data *)h; 1773b411b363SPhilipp Reisner int header_size, data_size; 1774b411b363SPhilipp Reisner int rw = WRITE; 1775b411b363SPhilipp Reisner u32 dp_flags; 1776b411b363SPhilipp Reisner 1777b411b363SPhilipp Reisner header_size = sizeof(*p) - sizeof(*h); 1778b411b363SPhilipp Reisner data_size = h->length - header_size; 1779b411b363SPhilipp Reisner 1780b411b363SPhilipp Reisner ERR_IF(data_size == 0) return FALSE; 1781b411b363SPhilipp Reisner 1782b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, header_size) != header_size) 1783b411b363SPhilipp Reisner return FALSE; 1784b411b363SPhilipp Reisner 1785b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 1786b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1787b411b363SPhilipp Reisner dev_err(DEV, "Can not write mirrored data block " 1788b411b363SPhilipp Reisner "to local disk.\n"); 1789b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1790b411b363SPhilipp Reisner if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) 1791b411b363SPhilipp Reisner mdev->peer_seq++; 1792b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1793b411b363SPhilipp Reisner 1794b411b363SPhilipp Reisner drbd_send_ack_dp(mdev, P_NEG_ACK, p); 1795b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 1796b411b363SPhilipp Reisner return drbd_drain_block(mdev, data_size); 1797b411b363SPhilipp Reisner } 1798b411b363SPhilipp Reisner 1799b411b363SPhilipp Reisner /* get_ldev(mdev) successful. 1800b411b363SPhilipp Reisner * Corresponding put_ldev done either below (on various errors), 1801b411b363SPhilipp Reisner * or in drbd_endio_write_sec, if we successfully submit the data at 1802b411b363SPhilipp Reisner * the end of this function. */ 1803b411b363SPhilipp Reisner 1804b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1805b411b363SPhilipp Reisner e = read_in_block(mdev, p->block_id, sector, data_size); 1806b411b363SPhilipp Reisner if (!e) { 1807b411b363SPhilipp Reisner put_ldev(mdev); 1808b411b363SPhilipp Reisner return FALSE; 1809b411b363SPhilipp Reisner } 1810b411b363SPhilipp Reisner 1811b411b363SPhilipp Reisner e->w.cb = e_end_block; 1812b411b363SPhilipp Reisner 1813b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1814b411b363SPhilipp Reisner e->epoch = mdev->current_epoch; 1815b411b363SPhilipp Reisner atomic_inc(&e->epoch->epoch_size); 1816b411b363SPhilipp Reisner atomic_inc(&e->epoch->active); 1817b411b363SPhilipp Reisner 1818b411b363SPhilipp Reisner if (mdev->write_ordering == WO_bio_barrier && atomic_read(&e->epoch->epoch_size) == 1) { 1819b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1820b411b363SPhilipp Reisner /* Issue a barrier if we start a new epoch, and the previous epoch 1821b411b363SPhilipp Reisner was not a epoch containing a single request which already was 1822b411b363SPhilipp Reisner a Barrier. */ 1823b411b363SPhilipp Reisner epoch = list_entry(e->epoch->list.prev, struct drbd_epoch, list); 1824b411b363SPhilipp Reisner if (epoch == e->epoch) { 1825b411b363SPhilipp Reisner set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags); 18267b6d91daSChristoph Hellwig rw |= REQ_HARDBARRIER; 1827b411b363SPhilipp Reisner e->flags |= EE_IS_BARRIER; 1828b411b363SPhilipp Reisner } else { 1829b411b363SPhilipp Reisner if (atomic_read(&epoch->epoch_size) > 1 || 1830b411b363SPhilipp Reisner !test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) { 1831b411b363SPhilipp Reisner set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags); 1832b411b363SPhilipp Reisner set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags); 18337b6d91daSChristoph Hellwig rw |= REQ_HARDBARRIER; 1834b411b363SPhilipp Reisner e->flags |= EE_IS_BARRIER; 1835b411b363SPhilipp Reisner } 1836b411b363SPhilipp Reisner } 1837b411b363SPhilipp Reisner } 1838b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1839b411b363SPhilipp Reisner 1840b411b363SPhilipp Reisner dp_flags = be32_to_cpu(p->dp_flags); 1841b411b363SPhilipp Reisner if (dp_flags & DP_HARDBARRIER) { 1842b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED would have submitted barrier request\n"); 18437b6d91daSChristoph Hellwig /* rw |= REQ_HARDBARRIER; */ 1844b411b363SPhilipp Reisner } 1845b411b363SPhilipp Reisner if (dp_flags & DP_RW_SYNC) 18467b6d91daSChristoph Hellwig rw |= REQ_SYNC | REQ_UNPLUG; 1847b411b363SPhilipp Reisner if (dp_flags & DP_MAY_SET_IN_SYNC) 1848b411b363SPhilipp Reisner e->flags |= EE_MAY_SET_IN_SYNC; 1849b411b363SPhilipp Reisner 1850b411b363SPhilipp Reisner /* I'm the receiver, I do hold a net_cnt reference. */ 1851b411b363SPhilipp Reisner if (!mdev->net_conf->two_primaries) { 1852b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1853b411b363SPhilipp Reisner } else { 1854b411b363SPhilipp Reisner /* don't get the req_lock yet, 1855b411b363SPhilipp Reisner * we may sleep in drbd_wait_peer_seq */ 1856b411b363SPhilipp Reisner const int size = e->size; 1857b411b363SPhilipp Reisner const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1858b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1859b411b363SPhilipp Reisner struct drbd_request *i; 1860b411b363SPhilipp Reisner struct hlist_node *n; 1861b411b363SPhilipp Reisner struct hlist_head *slot; 1862b411b363SPhilipp Reisner int first; 1863b411b363SPhilipp Reisner 1864b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1865b411b363SPhilipp Reisner BUG_ON(mdev->ee_hash == NULL); 1866b411b363SPhilipp Reisner BUG_ON(mdev->tl_hash == NULL); 1867b411b363SPhilipp Reisner 1868b411b363SPhilipp Reisner /* conflict detection and handling: 1869b411b363SPhilipp Reisner * 1. wait on the sequence number, 1870b411b363SPhilipp Reisner * in case this data packet overtook ACK packets. 1871b411b363SPhilipp Reisner * 2. check our hash tables for conflicting requests. 1872b411b363SPhilipp Reisner * we only need to walk the tl_hash, since an ee can not 1873b411b363SPhilipp Reisner * have a conflict with an other ee: on the submitting 1874b411b363SPhilipp Reisner * node, the corresponding req had already been conflicting, 1875b411b363SPhilipp Reisner * and a conflicting req is never sent. 1876b411b363SPhilipp Reisner * 1877b411b363SPhilipp Reisner * Note: for two_primaries, we are protocol C, 1878b411b363SPhilipp Reisner * so there cannot be any request that is DONE 1879b411b363SPhilipp Reisner * but still on the transfer log. 1880b411b363SPhilipp Reisner * 1881b411b363SPhilipp Reisner * unconditionally add to the ee_hash. 1882b411b363SPhilipp Reisner * 1883b411b363SPhilipp Reisner * if no conflicting request is found: 1884b411b363SPhilipp Reisner * submit. 1885b411b363SPhilipp Reisner * 1886b411b363SPhilipp Reisner * if any conflicting request is found 1887b411b363SPhilipp Reisner * that has not yet been acked, 1888b411b363SPhilipp Reisner * AND I have the "discard concurrent writes" flag: 1889b411b363SPhilipp Reisner * queue (via done_ee) the P_DISCARD_ACK; OUT. 1890b411b363SPhilipp Reisner * 1891b411b363SPhilipp Reisner * if any conflicting request is found: 1892b411b363SPhilipp Reisner * block the receiver, waiting on misc_wait 1893b411b363SPhilipp Reisner * until no more conflicting requests are there, 1894b411b363SPhilipp Reisner * or we get interrupted (disconnect). 1895b411b363SPhilipp Reisner * 1896b411b363SPhilipp Reisner * we do not just write after local io completion of those 1897b411b363SPhilipp Reisner * requests, but only after req is done completely, i.e. 1898b411b363SPhilipp Reisner * we wait for the P_DISCARD_ACK to arrive! 1899b411b363SPhilipp Reisner * 1900b411b363SPhilipp Reisner * then proceed normally, i.e. submit. 1901b411b363SPhilipp Reisner */ 1902b411b363SPhilipp Reisner if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) 1903b411b363SPhilipp Reisner goto out_interrupted; 1904b411b363SPhilipp Reisner 1905b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1906b411b363SPhilipp Reisner 1907b411b363SPhilipp Reisner hlist_add_head(&e->colision, ee_hash_slot(mdev, sector)); 1908b411b363SPhilipp Reisner 1909b411b363SPhilipp Reisner #define OVERLAPS overlaps(i->sector, i->size, sector, size) 1910b411b363SPhilipp Reisner slot = tl_hash_slot(mdev, sector); 1911b411b363SPhilipp Reisner first = 1; 1912b411b363SPhilipp Reisner for (;;) { 1913b411b363SPhilipp Reisner int have_unacked = 0; 1914b411b363SPhilipp Reisner int have_conflict = 0; 1915b411b363SPhilipp Reisner prepare_to_wait(&mdev->misc_wait, &wait, 1916b411b363SPhilipp Reisner TASK_INTERRUPTIBLE); 1917b411b363SPhilipp Reisner hlist_for_each_entry(i, n, slot, colision) { 1918b411b363SPhilipp Reisner if (OVERLAPS) { 1919b411b363SPhilipp Reisner /* only ALERT on first iteration, 1920b411b363SPhilipp Reisner * we may be woken up early... */ 1921b411b363SPhilipp Reisner if (first) 1922b411b363SPhilipp Reisner dev_alert(DEV, "%s[%u] Concurrent local write detected!" 1923b411b363SPhilipp Reisner " new: %llus +%u; pending: %llus +%u\n", 1924b411b363SPhilipp Reisner current->comm, current->pid, 1925b411b363SPhilipp Reisner (unsigned long long)sector, size, 1926b411b363SPhilipp Reisner (unsigned long long)i->sector, i->size); 1927b411b363SPhilipp Reisner if (i->rq_state & RQ_NET_PENDING) 1928b411b363SPhilipp Reisner ++have_unacked; 1929b411b363SPhilipp Reisner ++have_conflict; 1930b411b363SPhilipp Reisner } 1931b411b363SPhilipp Reisner } 1932b411b363SPhilipp Reisner #undef OVERLAPS 1933b411b363SPhilipp Reisner if (!have_conflict) 1934b411b363SPhilipp Reisner break; 1935b411b363SPhilipp Reisner 1936b411b363SPhilipp Reisner /* Discard Ack only for the _first_ iteration */ 1937b411b363SPhilipp Reisner if (first && discard && have_unacked) { 1938b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", 1939b411b363SPhilipp Reisner (unsigned long long)sector); 1940b411b363SPhilipp Reisner inc_unacked(mdev); 1941b411b363SPhilipp Reisner e->w.cb = e_send_discard_ack; 1942b411b363SPhilipp Reisner list_add_tail(&e->w.list, &mdev->done_ee); 1943b411b363SPhilipp Reisner 1944b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1945b411b363SPhilipp Reisner 1946b411b363SPhilipp Reisner /* we could probably send that P_DISCARD_ACK ourselves, 1947b411b363SPhilipp Reisner * but I don't like the receiver using the msock */ 1948b411b363SPhilipp Reisner 1949b411b363SPhilipp Reisner put_ldev(mdev); 1950b411b363SPhilipp Reisner wake_asender(mdev); 1951b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1952b411b363SPhilipp Reisner return TRUE; 1953b411b363SPhilipp Reisner } 1954b411b363SPhilipp Reisner 1955b411b363SPhilipp Reisner if (signal_pending(current)) { 1956b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1957b411b363SPhilipp Reisner 1958b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1959b411b363SPhilipp Reisner 1960b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1961b411b363SPhilipp Reisner goto out_interrupted; 1962b411b363SPhilipp Reisner } 1963b411b363SPhilipp Reisner 1964b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1965b411b363SPhilipp Reisner if (first) { 1966b411b363SPhilipp Reisner first = 0; 1967b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " 1968b411b363SPhilipp Reisner "sec=%llus\n", (unsigned long long)sector); 1969b411b363SPhilipp Reisner } else if (discard) { 1970b411b363SPhilipp Reisner /* we had none on the first iteration. 1971b411b363SPhilipp Reisner * there must be none now. */ 1972b411b363SPhilipp Reisner D_ASSERT(have_unacked == 0); 1973b411b363SPhilipp Reisner } 1974b411b363SPhilipp Reisner schedule(); 1975b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1976b411b363SPhilipp Reisner } 1977b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1978b411b363SPhilipp Reisner } 1979b411b363SPhilipp Reisner 1980b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->active_ee); 1981b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1982b411b363SPhilipp Reisner 1983b411b363SPhilipp Reisner switch (mdev->net_conf->wire_protocol) { 1984b411b363SPhilipp Reisner case DRBD_PROT_C: 1985b411b363SPhilipp Reisner inc_unacked(mdev); 1986b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 1987b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1988b411b363SPhilipp Reisner break; 1989b411b363SPhilipp Reisner case DRBD_PROT_B: 1990b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 1991b411b363SPhilipp Reisner * sends on the msock, but anyways */ 1992b411b363SPhilipp Reisner drbd_send_ack(mdev, P_RECV_ACK, e); 1993b411b363SPhilipp Reisner break; 1994b411b363SPhilipp Reisner case DRBD_PROT_A: 1995b411b363SPhilipp Reisner /* nothing to do */ 1996b411b363SPhilipp Reisner break; 1997b411b363SPhilipp Reisner } 1998b411b363SPhilipp Reisner 1999b411b363SPhilipp Reisner if (mdev->state.pdsk == D_DISKLESS) { 2000b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 2001b411b363SPhilipp Reisner drbd_set_out_of_sync(mdev, e->sector, e->size); 2002b411b363SPhilipp Reisner e->flags |= EE_CALL_AL_COMPLETE_IO; 2003b411b363SPhilipp Reisner drbd_al_begin_io(mdev, e->sector); 2004b411b363SPhilipp Reisner } 2005b411b363SPhilipp Reisner 200645bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0) 2007b411b363SPhilipp Reisner return TRUE; 2008b411b363SPhilipp Reisner 2009b411b363SPhilipp Reisner out_interrupted: 2010b411b363SPhilipp Reisner /* yes, the epoch_size now is imbalanced. 2011b411b363SPhilipp Reisner * but we drop the connection anyways, so we don't have a chance to 2012b411b363SPhilipp Reisner * receive a barrier... atomic_inc(&mdev->epoch_size); */ 2013b411b363SPhilipp Reisner put_ldev(mdev); 2014b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 2015b411b363SPhilipp Reisner return FALSE; 2016b411b363SPhilipp Reisner } 2017b411b363SPhilipp Reisner 2018b411b363SPhilipp Reisner static int receive_DataRequest(struct drbd_conf *mdev, struct p_header *h) 2019b411b363SPhilipp Reisner { 2020b411b363SPhilipp Reisner sector_t sector; 2021b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 2022b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 2023b411b363SPhilipp Reisner struct digest_info *di = NULL; 2024b411b363SPhilipp Reisner int size, digest_size; 2025b411b363SPhilipp Reisner unsigned int fault_type; 2026b411b363SPhilipp Reisner struct p_block_req *p = 2027b411b363SPhilipp Reisner (struct p_block_req *)h; 2028b411b363SPhilipp Reisner const int brps = sizeof(*p)-sizeof(*h); 2029b411b363SPhilipp Reisner 2030b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, brps) != brps) 2031b411b363SPhilipp Reisner return FALSE; 2032b411b363SPhilipp Reisner 2033b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2034b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2035b411b363SPhilipp Reisner 2036b411b363SPhilipp Reisner if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) { 2037b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2038b411b363SPhilipp Reisner (unsigned long long)sector, size); 2039b411b363SPhilipp Reisner return FALSE; 2040b411b363SPhilipp Reisner } 2041b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 2042b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2043b411b363SPhilipp Reisner (unsigned long long)sector, size); 2044b411b363SPhilipp Reisner return FALSE; 2045b411b363SPhilipp Reisner } 2046b411b363SPhilipp Reisner 2047b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 2048b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 2049b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2050b411b363SPhilipp Reisner "no local data.\n"); 2051b411b363SPhilipp Reisner drbd_send_ack_rp(mdev, h->command == P_DATA_REQUEST ? P_NEG_DREPLY : 2052b411b363SPhilipp Reisner P_NEG_RS_DREPLY , p); 2053c3470cdeSLars Ellenberg return drbd_drain_block(mdev, h->length - brps); 2054b411b363SPhilipp Reisner } 2055b411b363SPhilipp Reisner 2056b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2057b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2058b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 2059b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); 2060b411b363SPhilipp Reisner if (!e) { 2061b411b363SPhilipp Reisner put_ldev(mdev); 2062b411b363SPhilipp Reisner return FALSE; 2063b411b363SPhilipp Reisner } 2064b411b363SPhilipp Reisner 2065b411b363SPhilipp Reisner switch (h->command) { 2066b411b363SPhilipp Reisner case P_DATA_REQUEST: 2067b411b363SPhilipp Reisner e->w.cb = w_e_end_data_req; 2068b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 2069b411b363SPhilipp Reisner break; 2070b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2071b411b363SPhilipp Reisner e->w.cb = w_e_end_rsdata_req; 2072b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2073b411b363SPhilipp Reisner /* Eventually this should become asynchronously. Currently it 2074b411b363SPhilipp Reisner * blocks the whole receiver just to delay the reading of a 2075b411b363SPhilipp Reisner * resync data block. 2076b411b363SPhilipp Reisner * the drbd_work_queue mechanism is made for this... 2077b411b363SPhilipp Reisner */ 2078b411b363SPhilipp Reisner if (!drbd_rs_begin_io(mdev, sector)) { 2079b411b363SPhilipp Reisner /* we have been interrupted, 2080b411b363SPhilipp Reisner * probably connection lost! */ 2081b411b363SPhilipp Reisner D_ASSERT(signal_pending(current)); 2082b411b363SPhilipp Reisner goto out_free_e; 2083b411b363SPhilipp Reisner } 2084b411b363SPhilipp Reisner break; 2085b411b363SPhilipp Reisner 2086b411b363SPhilipp Reisner case P_OV_REPLY: 2087b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2088b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2089b411b363SPhilipp Reisner digest_size = h->length - brps ; 2090b411b363SPhilipp Reisner di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); 2091b411b363SPhilipp Reisner if (!di) 2092b411b363SPhilipp Reisner goto out_free_e; 2093b411b363SPhilipp Reisner 2094b411b363SPhilipp Reisner di->digest_size = digest_size; 2095b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2096b411b363SPhilipp Reisner 2097b411b363SPhilipp Reisner if (drbd_recv(mdev, di->digest, digest_size) != digest_size) 2098b411b363SPhilipp Reisner goto out_free_e; 2099b411b363SPhilipp Reisner 2100b411b363SPhilipp Reisner e->block_id = (u64)(unsigned long)di; 2101b411b363SPhilipp Reisner if (h->command == P_CSUM_RS_REQUEST) { 2102b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 2103b411b363SPhilipp Reisner e->w.cb = w_e_end_csum_rs_req; 2104b411b363SPhilipp Reisner } else if (h->command == P_OV_REPLY) { 2105b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_reply; 2106b411b363SPhilipp Reisner dec_rs_pending(mdev); 2107b411b363SPhilipp Reisner break; 2108b411b363SPhilipp Reisner } 2109b411b363SPhilipp Reisner 2110b411b363SPhilipp Reisner if (!drbd_rs_begin_io(mdev, sector)) { 2111b411b363SPhilipp Reisner /* we have been interrupted, probably connection lost! */ 2112b411b363SPhilipp Reisner D_ASSERT(signal_pending(current)); 2113b411b363SPhilipp Reisner goto out_free_e; 2114b411b363SPhilipp Reisner } 2115b411b363SPhilipp Reisner break; 2116b411b363SPhilipp Reisner 2117b411b363SPhilipp Reisner case P_OV_REQUEST: 2118b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && 2119b411b363SPhilipp Reisner mdev->state.conn != C_VERIFY_T) 2120b411b363SPhilipp Reisner dev_warn(DEV, "ASSERT FAILED: got P_OV_REQUEST while being %s\n", 2121b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 2122b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 2123b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90) { 2124b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2125b411b363SPhilipp Reisner mdev->ov_position = sector; 2126b411b363SPhilipp Reisner mdev->ov_left = mdev->rs_total - BM_SECT_TO_BIT(sector); 2127b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2128b411b363SPhilipp Reisner (unsigned long long)sector); 2129b411b363SPhilipp Reisner } 2130b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_req; 2131b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2132b411b363SPhilipp Reisner /* Eventually this should become asynchronous. Currently it 2133b411b363SPhilipp Reisner * blocks the whole receiver just to delay the reading of a 2134b411b363SPhilipp Reisner * resync data block. 2135b411b363SPhilipp Reisner * the drbd_work_queue mechanism is made for this... 2136b411b363SPhilipp Reisner */ 2137b411b363SPhilipp Reisner if (!drbd_rs_begin_io(mdev, sector)) { 2138b411b363SPhilipp Reisner /* we have been interrupted, 2139b411b363SPhilipp Reisner * probably connection lost! */ 2140b411b363SPhilipp Reisner D_ASSERT(signal_pending(current)); 2141b411b363SPhilipp Reisner goto out_free_e; 2142b411b363SPhilipp Reisner } 2143b411b363SPhilipp Reisner break; 2144b411b363SPhilipp Reisner 2145b411b363SPhilipp Reisner 2146b411b363SPhilipp Reisner default: 2147b411b363SPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 2148b411b363SPhilipp Reisner cmdname(h->command)); 2149b411b363SPhilipp Reisner fault_type = DRBD_FAULT_MAX; 2150b411b363SPhilipp Reisner } 2151b411b363SPhilipp Reisner 2152b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 2153b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->read_ee); 2154b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 2155b411b363SPhilipp Reisner 2156b411b363SPhilipp Reisner inc_unacked(mdev); 2157b411b363SPhilipp Reisner 215845bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, READ, fault_type) == 0) 2159b411b363SPhilipp Reisner return TRUE; 2160b411b363SPhilipp Reisner 2161b411b363SPhilipp Reisner out_free_e: 2162b411b363SPhilipp Reisner kfree(di); 2163b411b363SPhilipp Reisner put_ldev(mdev); 2164b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 2165b411b363SPhilipp Reisner return FALSE; 2166b411b363SPhilipp Reisner } 2167b411b363SPhilipp Reisner 2168b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2169b411b363SPhilipp Reisner { 2170b411b363SPhilipp Reisner int self, peer, rv = -100; 2171b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 2172b411b363SPhilipp Reisner 2173b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2174b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2175b411b363SPhilipp Reisner 2176b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2177b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2178b411b363SPhilipp Reisner 2179b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_0p) { 2180b411b363SPhilipp Reisner case ASB_CONSENSUS: 2181b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2182b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2183b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2184b411b363SPhilipp Reisner break; 2185b411b363SPhilipp Reisner case ASB_DISCONNECT: 2186b411b363SPhilipp Reisner break; 2187b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2188b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2189b411b363SPhilipp Reisner rv = -1; 2190b411b363SPhilipp Reisner break; 2191b411b363SPhilipp Reisner } 2192b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2193b411b363SPhilipp Reisner rv = 1; 2194b411b363SPhilipp Reisner break; 2195b411b363SPhilipp Reisner } 2196b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2197b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2198b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2199b411b363SPhilipp Reisner rv = 1; 2200b411b363SPhilipp Reisner break; 2201b411b363SPhilipp Reisner } 2202b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2203b411b363SPhilipp Reisner rv = -1; 2204b411b363SPhilipp Reisner break; 2205b411b363SPhilipp Reisner } 2206b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2207ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2208b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2209b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2210b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 2211b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2212b411b363SPhilipp Reisner ? -1 : 1; 2213b411b363SPhilipp Reisner break; 2214b411b363SPhilipp Reisner } else { 2215b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2216b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2217b411b363SPhilipp Reisner } 2218b411b363SPhilipp Reisner if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) 2219b411b363SPhilipp Reisner break; 2220b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2221b411b363SPhilipp Reisner if (ch_self < ch_peer) 2222b411b363SPhilipp Reisner rv = -1; 2223b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2224b411b363SPhilipp Reisner rv = 1; 2225b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2226b411b363SPhilipp Reisner /* Well, then use something else. */ 2227b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2228b411b363SPhilipp Reisner ? -1 : 1; 2229b411b363SPhilipp Reisner break; 2230b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2231b411b363SPhilipp Reisner rv = -1; 2232b411b363SPhilipp Reisner break; 2233b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2234b411b363SPhilipp Reisner rv = 1; 2235b411b363SPhilipp Reisner } 2236b411b363SPhilipp Reisner 2237b411b363SPhilipp Reisner return rv; 2238b411b363SPhilipp Reisner } 2239b411b363SPhilipp Reisner 2240b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2241b411b363SPhilipp Reisner { 2242b411b363SPhilipp Reisner int self, peer, hg, rv = -100; 2243b411b363SPhilipp Reisner 2244b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2245b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2246b411b363SPhilipp Reisner 2247b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_1p) { 2248b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2249b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2250b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2251b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2252b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2253b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2254b411b363SPhilipp Reisner break; 2255b411b363SPhilipp Reisner case ASB_DISCONNECT: 2256b411b363SPhilipp Reisner break; 2257b411b363SPhilipp Reisner case ASB_CONSENSUS: 2258b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2259b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2260b411b363SPhilipp Reisner rv = hg; 2261b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2262b411b363SPhilipp Reisner rv = hg; 2263b411b363SPhilipp Reisner break; 2264b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2265b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2266b411b363SPhilipp Reisner break; 2267b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2268b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2269b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2270b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2271b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2272b411b363SPhilipp Reisner self = drbd_set_role(mdev, R_SECONDARY, 0); 2273b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2274b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2275b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2276b411b363SPhilipp Reisner self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2277b411b363SPhilipp Reisner if (self != SS_SUCCESS) { 2278b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2279b411b363SPhilipp Reisner } else { 2280b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2281b411b363SPhilipp Reisner rv = hg; 2282b411b363SPhilipp Reisner } 2283b411b363SPhilipp Reisner } else 2284b411b363SPhilipp Reisner rv = hg; 2285b411b363SPhilipp Reisner } 2286b411b363SPhilipp Reisner 2287b411b363SPhilipp Reisner return rv; 2288b411b363SPhilipp Reisner } 2289b411b363SPhilipp Reisner 2290b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2291b411b363SPhilipp Reisner { 2292b411b363SPhilipp Reisner int self, peer, hg, rv = -100; 2293b411b363SPhilipp Reisner 2294b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2295b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2296b411b363SPhilipp Reisner 2297b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_2p) { 2298b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2299b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2300b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2301b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2302b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2303b411b363SPhilipp Reisner case ASB_CONSENSUS: 2304b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2305b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2306b411b363SPhilipp Reisner break; 2307b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2308b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2309b411b363SPhilipp Reisner break; 2310b411b363SPhilipp Reisner case ASB_DISCONNECT: 2311b411b363SPhilipp Reisner break; 2312b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2313b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2314b411b363SPhilipp Reisner if (hg == -1) { 2315b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2316b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2317b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2318b411b363SPhilipp Reisner self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2319b411b363SPhilipp Reisner if (self != SS_SUCCESS) { 2320b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2321b411b363SPhilipp Reisner } else { 2322b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2323b411b363SPhilipp Reisner rv = hg; 2324b411b363SPhilipp Reisner } 2325b411b363SPhilipp Reisner } else 2326b411b363SPhilipp Reisner rv = hg; 2327b411b363SPhilipp Reisner } 2328b411b363SPhilipp Reisner 2329b411b363SPhilipp Reisner return rv; 2330b411b363SPhilipp Reisner } 2331b411b363SPhilipp Reisner 2332b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2333b411b363SPhilipp Reisner u64 bits, u64 flags) 2334b411b363SPhilipp Reisner { 2335b411b363SPhilipp Reisner if (!uuid) { 2336b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2337b411b363SPhilipp Reisner return; 2338b411b363SPhilipp Reisner } 2339b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2340b411b363SPhilipp Reisner text, 2341b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2342b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2343b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2344b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2345b411b363SPhilipp Reisner (unsigned long long)bits, 2346b411b363SPhilipp Reisner (unsigned long long)flags); 2347b411b363SPhilipp Reisner } 2348b411b363SPhilipp Reisner 2349b411b363SPhilipp Reisner /* 2350b411b363SPhilipp Reisner 100 after split brain try auto recover 2351b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2352b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2353b411b363SPhilipp Reisner 0 no Sync 2354b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2355b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2356b411b363SPhilipp Reisner -100 after split brain, disconnect 2357b411b363SPhilipp Reisner -1000 unrelated data 2358b411b363SPhilipp Reisner */ 2359b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2360b411b363SPhilipp Reisner { 2361b411b363SPhilipp Reisner u64 self, peer; 2362b411b363SPhilipp Reisner int i, j; 2363b411b363SPhilipp Reisner 2364b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2365b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2366b411b363SPhilipp Reisner 2367b411b363SPhilipp Reisner *rule_nr = 10; 2368b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2369b411b363SPhilipp Reisner return 0; 2370b411b363SPhilipp Reisner 2371b411b363SPhilipp Reisner *rule_nr = 20; 2372b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2373b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2374b411b363SPhilipp Reisner return -2; 2375b411b363SPhilipp Reisner 2376b411b363SPhilipp Reisner *rule_nr = 30; 2377b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2378b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2379b411b363SPhilipp Reisner return 2; 2380b411b363SPhilipp Reisner 2381b411b363SPhilipp Reisner if (self == peer) { 2382b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2383b411b363SPhilipp Reisner 2384b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2385b411b363SPhilipp Reisner 2386b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2387b411b363SPhilipp Reisner return -1001; 2388b411b363SPhilipp Reisner 2389b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2390b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2391b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2392b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2393b411b363SPhilipp Reisner 2394b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2395b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2396b411b363SPhilipp Reisner *rule_nr = 34; 2397b411b363SPhilipp Reisner } else { 2398b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2399b411b363SPhilipp Reisner *rule_nr = 36; 2400b411b363SPhilipp Reisner } 2401b411b363SPhilipp Reisner 2402b411b363SPhilipp Reisner return 1; 2403b411b363SPhilipp Reisner } 2404b411b363SPhilipp Reisner 2405b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2406b411b363SPhilipp Reisner 2407b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2408b411b363SPhilipp Reisner return -1001; 2409b411b363SPhilipp Reisner 2410b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2411b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2412b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2413b411b363SPhilipp Reisner 2414b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2415b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2416b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2417b411b363SPhilipp Reisner 2418b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2419b411b363SPhilipp Reisner *rule_nr = 35; 2420b411b363SPhilipp Reisner } else { 2421b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2422b411b363SPhilipp Reisner *rule_nr = 37; 2423b411b363SPhilipp Reisner } 2424b411b363SPhilipp Reisner 2425b411b363SPhilipp Reisner return -1; 2426b411b363SPhilipp Reisner } 2427b411b363SPhilipp Reisner 2428b411b363SPhilipp Reisner /* Common power [off|failure] */ 2429b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2430b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2431b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2432b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2433b411b363SPhilipp Reisner *rule_nr = 40; 2434b411b363SPhilipp Reisner 2435b411b363SPhilipp Reisner switch (rct) { 2436b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2437b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2438b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2439b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 2440b411b363SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->flags); 2441b411b363SPhilipp Reisner return dc ? -1 : 1; 2442b411b363SPhilipp Reisner } 2443b411b363SPhilipp Reisner } 2444b411b363SPhilipp Reisner 2445b411b363SPhilipp Reisner *rule_nr = 50; 2446b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2447b411b363SPhilipp Reisner if (self == peer) 2448b411b363SPhilipp Reisner return -1; 2449b411b363SPhilipp Reisner 2450b411b363SPhilipp Reisner *rule_nr = 51; 2451b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2452b411b363SPhilipp Reisner if (self == peer) { 2453b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2454b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1); 2455b411b363SPhilipp Reisner if (self == peer) { 2456b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2457b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2458b411b363SPhilipp Reisner 2459b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2460b411b363SPhilipp Reisner return -1001; 2461b411b363SPhilipp Reisner 2462b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2463b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 2464b411b363SPhilipp Reisner return -1; 2465b411b363SPhilipp Reisner } 2466b411b363SPhilipp Reisner } 2467b411b363SPhilipp Reisner 2468b411b363SPhilipp Reisner *rule_nr = 60; 2469b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2470b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2471b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2472b411b363SPhilipp Reisner if (self == peer) 2473b411b363SPhilipp Reisner return -2; 2474b411b363SPhilipp Reisner } 2475b411b363SPhilipp Reisner 2476b411b363SPhilipp Reisner *rule_nr = 70; 2477b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2478b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2479b411b363SPhilipp Reisner if (self == peer) 2480b411b363SPhilipp Reisner return 1; 2481b411b363SPhilipp Reisner 2482b411b363SPhilipp Reisner *rule_nr = 71; 2483b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2484b411b363SPhilipp Reisner if (self == peer) { 2485b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1); 2486b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2487b411b363SPhilipp Reisner if (self == peer) { 2488b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2489b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2490b411b363SPhilipp Reisner 2491b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2492b411b363SPhilipp Reisner return -1001; 2493b411b363SPhilipp Reisner 2494b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2495b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2496b411b363SPhilipp Reisner 2497b411b363SPhilipp Reisner dev_info(DEV, "Undid last start of resync:\n"); 2498b411b363SPhilipp Reisner 2499b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2500b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2501b411b363SPhilipp Reisner 2502b411b363SPhilipp Reisner return 1; 2503b411b363SPhilipp Reisner } 2504b411b363SPhilipp Reisner } 2505b411b363SPhilipp Reisner 2506b411b363SPhilipp Reisner 2507b411b363SPhilipp Reisner *rule_nr = 80; 2508d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2509b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2510b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2511b411b363SPhilipp Reisner if (self == peer) 2512b411b363SPhilipp Reisner return 2; 2513b411b363SPhilipp Reisner } 2514b411b363SPhilipp Reisner 2515b411b363SPhilipp Reisner *rule_nr = 90; 2516b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2517b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2518b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2519b411b363SPhilipp Reisner return 100; 2520b411b363SPhilipp Reisner 2521b411b363SPhilipp Reisner *rule_nr = 100; 2522b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2523b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2524b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2525b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2526b411b363SPhilipp Reisner if (self == peer) 2527b411b363SPhilipp Reisner return -100; 2528b411b363SPhilipp Reisner } 2529b411b363SPhilipp Reisner } 2530b411b363SPhilipp Reisner 2531b411b363SPhilipp Reisner return -1000; 2532b411b363SPhilipp Reisner } 2533b411b363SPhilipp Reisner 2534b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2535b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2536b411b363SPhilipp Reisner */ 2537b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2538b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2539b411b363SPhilipp Reisner { 2540b411b363SPhilipp Reisner int hg, rule_nr; 2541b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2542b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 2543b411b363SPhilipp Reisner 2544b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2545b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2546b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2547b411b363SPhilipp Reisner 2548b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2549b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2550b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2551b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2552b411b363SPhilipp Reisner 2553b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2554b411b363SPhilipp Reisner 2555b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2556b411b363SPhilipp Reisner 2557b411b363SPhilipp Reisner if (hg == -1000) { 2558b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2559b411b363SPhilipp Reisner return C_MASK; 2560b411b363SPhilipp Reisner } 2561b411b363SPhilipp Reisner if (hg == -1001) { 2562b411b363SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol\n"); 2563b411b363SPhilipp Reisner return C_MASK; 2564b411b363SPhilipp Reisner } 2565b411b363SPhilipp Reisner 2566b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2567b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2568b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2569b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2570b411b363SPhilipp Reisner if (f) 2571b411b363SPhilipp Reisner hg = hg*2; 2572b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2573b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2574b411b363SPhilipp Reisner } 2575b411b363SPhilipp Reisner 25763a11a487SAdam Gandelman if (abs(hg) == 100) 25773a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 25783a11a487SAdam Gandelman 2579b411b363SPhilipp Reisner if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) { 2580b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2581b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2582b411b363SPhilipp Reisner int forced = (hg == -100); 2583b411b363SPhilipp Reisner 2584b411b363SPhilipp Reisner switch (pcount) { 2585b411b363SPhilipp Reisner case 0: 2586b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2587b411b363SPhilipp Reisner break; 2588b411b363SPhilipp Reisner case 1: 2589b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2590b411b363SPhilipp Reisner break; 2591b411b363SPhilipp Reisner case 2: 2592b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2593b411b363SPhilipp Reisner break; 2594b411b363SPhilipp Reisner } 2595b411b363SPhilipp Reisner if (abs(hg) < 100) { 2596b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2597b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2598b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2599b411b363SPhilipp Reisner if (forced) { 2600b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2601b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2602b411b363SPhilipp Reisner hg = hg*2; 2603b411b363SPhilipp Reisner } 2604b411b363SPhilipp Reisner } 2605b411b363SPhilipp Reisner } 2606b411b363SPhilipp Reisner 2607b411b363SPhilipp Reisner if (hg == -100) { 2608b411b363SPhilipp Reisner if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2609b411b363SPhilipp Reisner hg = -1; 2610b411b363SPhilipp Reisner if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2611b411b363SPhilipp Reisner hg = 1; 2612b411b363SPhilipp Reisner 2613b411b363SPhilipp Reisner if (abs(hg) < 100) 2614b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2615b411b363SPhilipp Reisner "Sync from %s node\n", 2616b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2617b411b363SPhilipp Reisner } 2618b411b363SPhilipp Reisner 2619b411b363SPhilipp Reisner if (hg == -100) { 2620580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2621580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2622580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2623580b9767SLars Ellenberg * to that disk, in a way... */ 26243a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2625b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2626b411b363SPhilipp Reisner return C_MASK; 2627b411b363SPhilipp Reisner } 2628b411b363SPhilipp Reisner 2629b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2630b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2631b411b363SPhilipp Reisner return C_MASK; 2632b411b363SPhilipp Reisner } 2633b411b363SPhilipp Reisner 2634b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2635b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 2636b411b363SPhilipp Reisner switch (mdev->net_conf->rr_conflict) { 2637b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2638b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2639b411b363SPhilipp Reisner /* fall through */ 2640b411b363SPhilipp Reisner case ASB_DISCONNECT: 2641b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2642b411b363SPhilipp Reisner return C_MASK; 2643b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2644b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2645b411b363SPhilipp Reisner "assumption\n"); 2646b411b363SPhilipp Reisner } 2647b411b363SPhilipp Reisner } 2648b411b363SPhilipp Reisner 2649cf14c2e9SPhilipp Reisner if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { 2650cf14c2e9SPhilipp Reisner if (hg == 0) 2651cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2652cf14c2e9SPhilipp Reisner else 2653cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2654cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2655cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2656cf14c2e9SPhilipp Reisner return C_MASK; 2657cf14c2e9SPhilipp Reisner } 2658cf14c2e9SPhilipp Reisner 2659b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2660b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 2661b411b363SPhilipp Reisner if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake")) 2662b411b363SPhilipp Reisner return C_MASK; 2663b411b363SPhilipp Reisner } 2664b411b363SPhilipp Reisner 2665b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2666b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2667b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2668b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2669b411b363SPhilipp Reisner } else { 2670b411b363SPhilipp Reisner rv = C_CONNECTED; 2671b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2672b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2673b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2674b411b363SPhilipp Reisner } 2675b411b363SPhilipp Reisner } 2676b411b363SPhilipp Reisner 2677b411b363SPhilipp Reisner return rv; 2678b411b363SPhilipp Reisner } 2679b411b363SPhilipp Reisner 2680b411b363SPhilipp Reisner /* returns 1 if invalid */ 2681b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2682b411b363SPhilipp Reisner { 2683b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2684b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2685b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2686b411b363SPhilipp Reisner return 0; 2687b411b363SPhilipp Reisner 2688b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2689b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2690b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2691b411b363SPhilipp Reisner return 1; 2692b411b363SPhilipp Reisner 2693b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2694b411b363SPhilipp Reisner if (peer == self) 2695b411b363SPhilipp Reisner return 0; 2696b411b363SPhilipp Reisner 2697b411b363SPhilipp Reisner /* everything es is invalid. */ 2698b411b363SPhilipp Reisner return 1; 2699b411b363SPhilipp Reisner } 2700b411b363SPhilipp Reisner 2701b411b363SPhilipp Reisner static int receive_protocol(struct drbd_conf *mdev, struct p_header *h) 2702b411b363SPhilipp Reisner { 2703b411b363SPhilipp Reisner struct p_protocol *p = (struct p_protocol *)h; 2704b411b363SPhilipp Reisner int header_size, data_size; 2705b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2706cf14c2e9SPhilipp Reisner int p_want_lose, p_two_primaries, cf; 2707b411b363SPhilipp Reisner char p_integrity_alg[SHARED_SECRET_MAX] = ""; 2708b411b363SPhilipp Reisner 2709b411b363SPhilipp Reisner header_size = sizeof(*p) - sizeof(*h); 2710b411b363SPhilipp Reisner data_size = h->length - header_size; 2711b411b363SPhilipp Reisner 2712b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, header_size) != header_size) 2713b411b363SPhilipp Reisner return FALSE; 2714b411b363SPhilipp Reisner 2715b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2716b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 2717b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 2718b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 2719b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 2720cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 2721cf14c2e9SPhilipp Reisner p_want_lose = cf & CF_WANT_LOSE; 2722cf14c2e9SPhilipp Reisner 2723cf14c2e9SPhilipp Reisner clear_bit(CONN_DRY_RUN, &mdev->flags); 2724cf14c2e9SPhilipp Reisner 2725cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 2726cf14c2e9SPhilipp Reisner set_bit(CONN_DRY_RUN, &mdev->flags); 2727b411b363SPhilipp Reisner 2728b411b363SPhilipp Reisner if (p_proto != mdev->net_conf->wire_protocol) { 2729b411b363SPhilipp Reisner dev_err(DEV, "incompatible communication protocols\n"); 2730b411b363SPhilipp Reisner goto disconnect; 2731b411b363SPhilipp Reisner } 2732b411b363SPhilipp Reisner 2733b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) { 2734b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-0pri settings\n"); 2735b411b363SPhilipp Reisner goto disconnect; 2736b411b363SPhilipp Reisner } 2737b411b363SPhilipp Reisner 2738b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) { 2739b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-1pri settings\n"); 2740b411b363SPhilipp Reisner goto disconnect; 2741b411b363SPhilipp Reisner } 2742b411b363SPhilipp Reisner 2743b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) { 2744b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-2pri settings\n"); 2745b411b363SPhilipp Reisner goto disconnect; 2746b411b363SPhilipp Reisner } 2747b411b363SPhilipp Reisner 2748b411b363SPhilipp Reisner if (p_want_lose && mdev->net_conf->want_lose) { 2749b411b363SPhilipp Reisner dev_err(DEV, "both sides have the 'want_lose' flag set\n"); 2750b411b363SPhilipp Reisner goto disconnect; 2751b411b363SPhilipp Reisner } 2752b411b363SPhilipp Reisner 2753b411b363SPhilipp Reisner if (p_two_primaries != mdev->net_conf->two_primaries) { 2754b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the two-primaries options\n"); 2755b411b363SPhilipp Reisner goto disconnect; 2756b411b363SPhilipp Reisner } 2757b411b363SPhilipp Reisner 2758b411b363SPhilipp Reisner if (mdev->agreed_pro_version >= 87) { 2759b411b363SPhilipp Reisner unsigned char *my_alg = mdev->net_conf->integrity_alg; 2760b411b363SPhilipp Reisner 2761b411b363SPhilipp Reisner if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) 2762b411b363SPhilipp Reisner return FALSE; 2763b411b363SPhilipp Reisner 2764b411b363SPhilipp Reisner p_integrity_alg[SHARED_SECRET_MAX-1] = 0; 2765b411b363SPhilipp Reisner if (strcmp(p_integrity_alg, my_alg)) { 2766b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); 2767b411b363SPhilipp Reisner goto disconnect; 2768b411b363SPhilipp Reisner } 2769b411b363SPhilipp Reisner dev_info(DEV, "data-integrity-alg: %s\n", 2770b411b363SPhilipp Reisner my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); 2771b411b363SPhilipp Reisner } 2772b411b363SPhilipp Reisner 2773b411b363SPhilipp Reisner return TRUE; 2774b411b363SPhilipp Reisner 2775b411b363SPhilipp Reisner disconnect: 2776b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2777b411b363SPhilipp Reisner return FALSE; 2778b411b363SPhilipp Reisner } 2779b411b363SPhilipp Reisner 2780b411b363SPhilipp Reisner /* helper function 2781b411b363SPhilipp Reisner * input: alg name, feature name 2782b411b363SPhilipp Reisner * return: NULL (alg name was "") 2783b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 2784b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 2785b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 2786b411b363SPhilipp Reisner const char *alg, const char *name) 2787b411b363SPhilipp Reisner { 2788b411b363SPhilipp Reisner struct crypto_hash *tfm; 2789b411b363SPhilipp Reisner 2790b411b363SPhilipp Reisner if (!alg[0]) 2791b411b363SPhilipp Reisner return NULL; 2792b411b363SPhilipp Reisner 2793b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 2794b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 2795b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 2796b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 2797b411b363SPhilipp Reisner return tfm; 2798b411b363SPhilipp Reisner } 2799b411b363SPhilipp Reisner if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 2800b411b363SPhilipp Reisner crypto_free_hash(tfm); 2801b411b363SPhilipp Reisner dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); 2802b411b363SPhilipp Reisner return ERR_PTR(-EINVAL); 2803b411b363SPhilipp Reisner } 2804b411b363SPhilipp Reisner return tfm; 2805b411b363SPhilipp Reisner } 2806b411b363SPhilipp Reisner 2807b411b363SPhilipp Reisner static int receive_SyncParam(struct drbd_conf *mdev, struct p_header *h) 2808b411b363SPhilipp Reisner { 2809b411b363SPhilipp Reisner int ok = TRUE; 28108e26f9ccSPhilipp Reisner struct p_rs_param_95 *p = (struct p_rs_param_95 *)h; 2811b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 2812b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 2813b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 2814b411b363SPhilipp Reisner const int apv = mdev->agreed_pro_version; 2815778f271dSPhilipp Reisner int *rs_plan_s = NULL; 2816778f271dSPhilipp Reisner int fifo_size = 0; 2817b411b363SPhilipp Reisner 2818b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 2819b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 2820b411b363SPhilipp Reisner + SHARED_SECRET_MAX 28218e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 28228e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 2823b411b363SPhilipp Reisner 2824b411b363SPhilipp Reisner if (h->length > exp_max_sz) { 2825b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 2826b411b363SPhilipp Reisner h->length, exp_max_sz); 2827b411b363SPhilipp Reisner return FALSE; 2828b411b363SPhilipp Reisner } 2829b411b363SPhilipp Reisner 2830b411b363SPhilipp Reisner if (apv <= 88) { 2831b411b363SPhilipp Reisner header_size = sizeof(struct p_rs_param) - sizeof(*h); 2832b411b363SPhilipp Reisner data_size = h->length - header_size; 28338e26f9ccSPhilipp Reisner } else if (apv <= 94) { 2834b411b363SPhilipp Reisner header_size = sizeof(struct p_rs_param_89) - sizeof(*h); 2835b411b363SPhilipp Reisner data_size = h->length - header_size; 2836b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 28378e26f9ccSPhilipp Reisner } else { 28388e26f9ccSPhilipp Reisner header_size = sizeof(struct p_rs_param_95) - sizeof(*h); 28398e26f9ccSPhilipp Reisner data_size = h->length - header_size; 28408e26f9ccSPhilipp Reisner D_ASSERT(data_size == 0); 2841b411b363SPhilipp Reisner } 2842b411b363SPhilipp Reisner 2843b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 2844b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 2845b411b363SPhilipp Reisner 2846b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, header_size) != header_size) 2847b411b363SPhilipp Reisner return FALSE; 2848b411b363SPhilipp Reisner 2849b411b363SPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 2850b411b363SPhilipp Reisner 2851b411b363SPhilipp Reisner if (apv >= 88) { 2852b411b363SPhilipp Reisner if (apv == 88) { 2853b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 2854b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 2855b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 2856b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 2857b411b363SPhilipp Reisner return FALSE; 2858b411b363SPhilipp Reisner } 2859b411b363SPhilipp Reisner 2860b411b363SPhilipp Reisner if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) 2861b411b363SPhilipp Reisner return FALSE; 2862b411b363SPhilipp Reisner 2863b411b363SPhilipp Reisner /* we expect NUL terminated string */ 2864b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2865b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 2866b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 2867b411b363SPhilipp Reisner 2868b411b363SPhilipp Reisner } else /* apv >= 89 */ { 2869b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 2870b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2871b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 2872b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 2873b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 2874b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 2875b411b363SPhilipp Reisner } 2876b411b363SPhilipp Reisner 2877b411b363SPhilipp Reisner if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { 2878b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2879b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 2880b411b363SPhilipp Reisner mdev->sync_conf.verify_alg, p->verify_alg); 2881b411b363SPhilipp Reisner goto disconnect; 2882b411b363SPhilipp Reisner } 2883b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 2884b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 2885b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 2886b411b363SPhilipp Reisner verify_tfm = NULL; 2887b411b363SPhilipp Reisner goto disconnect; 2888b411b363SPhilipp Reisner } 2889b411b363SPhilipp Reisner } 2890b411b363SPhilipp Reisner 2891b411b363SPhilipp Reisner if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { 2892b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2893b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 2894b411b363SPhilipp Reisner mdev->sync_conf.csums_alg, p->csums_alg); 2895b411b363SPhilipp Reisner goto disconnect; 2896b411b363SPhilipp Reisner } 2897b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 2898b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 2899b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 2900b411b363SPhilipp Reisner csums_tfm = NULL; 2901b411b363SPhilipp Reisner goto disconnect; 2902b411b363SPhilipp Reisner } 2903b411b363SPhilipp Reisner } 2904b411b363SPhilipp Reisner 29058e26f9ccSPhilipp Reisner if (apv > 94) { 29068e26f9ccSPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 29078e26f9ccSPhilipp Reisner mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 29088e26f9ccSPhilipp Reisner mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target); 29098e26f9ccSPhilipp Reisner mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target); 29108e26f9ccSPhilipp Reisner mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate); 2911778f271dSPhilipp Reisner 2912778f271dSPhilipp Reisner fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 2913778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 2914778f271dSPhilipp Reisner rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 2915778f271dSPhilipp Reisner if (!rs_plan_s) { 2916778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 2917778f271dSPhilipp Reisner goto disconnect; 2918778f271dSPhilipp Reisner } 2919778f271dSPhilipp Reisner } 29208e26f9ccSPhilipp Reisner } 2921b411b363SPhilipp Reisner 2922b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 2923b411b363SPhilipp Reisner /* lock against drbd_nl_syncer_conf() */ 2924b411b363SPhilipp Reisner if (verify_tfm) { 2925b411b363SPhilipp Reisner strcpy(mdev->sync_conf.verify_alg, p->verify_alg); 2926b411b363SPhilipp Reisner mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; 2927b411b363SPhilipp Reisner crypto_free_hash(mdev->verify_tfm); 2928b411b363SPhilipp Reisner mdev->verify_tfm = verify_tfm; 2929b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 2930b411b363SPhilipp Reisner } 2931b411b363SPhilipp Reisner if (csums_tfm) { 2932b411b363SPhilipp Reisner strcpy(mdev->sync_conf.csums_alg, p->csums_alg); 2933b411b363SPhilipp Reisner mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; 2934b411b363SPhilipp Reisner crypto_free_hash(mdev->csums_tfm); 2935b411b363SPhilipp Reisner mdev->csums_tfm = csums_tfm; 2936b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 2937b411b363SPhilipp Reisner } 2938778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size) { 2939778f271dSPhilipp Reisner kfree(mdev->rs_plan_s.values); 2940778f271dSPhilipp Reisner mdev->rs_plan_s.values = rs_plan_s; 2941778f271dSPhilipp Reisner mdev->rs_plan_s.size = fifo_size; 2942778f271dSPhilipp Reisner mdev->rs_planed = 0; 2943778f271dSPhilipp Reisner } 2944b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 2945b411b363SPhilipp Reisner } 2946b411b363SPhilipp Reisner 2947b411b363SPhilipp Reisner return ok; 2948b411b363SPhilipp Reisner disconnect: 2949b411b363SPhilipp Reisner /* just for completeness: actually not needed, 2950b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 2951b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 2952b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 2953b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 2954b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2955b411b363SPhilipp Reisner return FALSE; 2956b411b363SPhilipp Reisner } 2957b411b363SPhilipp Reisner 2958b411b363SPhilipp Reisner static void drbd_setup_order_type(struct drbd_conf *mdev, int peer) 2959b411b363SPhilipp Reisner { 2960b411b363SPhilipp Reisner /* sorry, we currently have no working implementation 2961b411b363SPhilipp Reisner * of distributed TCQ */ 2962b411b363SPhilipp Reisner } 2963b411b363SPhilipp Reisner 2964b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 2965b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 2966b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 2967b411b363SPhilipp Reisner { 2968b411b363SPhilipp Reisner sector_t d; 2969b411b363SPhilipp Reisner if (a == 0 || b == 0) 2970b411b363SPhilipp Reisner return; 2971b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 2972b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 2973b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 2974b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 2975b411b363SPhilipp Reisner } 2976b411b363SPhilipp Reisner 2977b411b363SPhilipp Reisner static int receive_sizes(struct drbd_conf *mdev, struct p_header *h) 2978b411b363SPhilipp Reisner { 2979b411b363SPhilipp Reisner struct p_sizes *p = (struct p_sizes *)h; 2980b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 2981b411b363SPhilipp Reisner unsigned int max_seg_s; 2982b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 2983b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 2984e89b591cSPhilipp Reisner enum dds_flags ddsf; 2985b411b363SPhilipp Reisner 2986b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; 2987b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, h->length) != h->length) 2988b411b363SPhilipp Reisner return FALSE; 2989b411b363SPhilipp Reisner 2990b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 2991b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 2992b411b363SPhilipp Reisner 2993b411b363SPhilipp Reisner if (p_size == 0 && mdev->state.disk == D_DISKLESS) { 2994b411b363SPhilipp Reisner dev_err(DEV, "some backing storage is needed\n"); 2995b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2996b411b363SPhilipp Reisner return FALSE; 2997b411b363SPhilipp Reisner } 2998b411b363SPhilipp Reisner 2999b411b363SPhilipp Reisner /* just store the peer's disk size for now. 3000b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 3001b411b363SPhilipp Reisner mdev->p_size = p_size; 3002b411b363SPhilipp Reisner 3003b411b363SPhilipp Reisner #define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r)) 3004b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3005b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 3006b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 3007b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 3008b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 3009b411b363SPhilipp Reisner 3010b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 3011b411b363SPhilipp Reisner * param exchange, choose the minimum */ 3012b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 3013b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 3014b411b363SPhilipp Reisner p_usize); 3015b411b363SPhilipp Reisner 3016b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 3017b411b363SPhilipp Reisner 3018b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 3019b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 3020b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3021b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 3022b411b363SPhilipp Reisner } 3023b411b363SPhilipp Reisner 3024b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3025b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3026a393db6fSPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, 0) < 3027b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3028b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3029b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3030b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 3031b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3032b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 3033b411b363SPhilipp Reisner put_ldev(mdev); 3034b411b363SPhilipp Reisner return FALSE; 3035b411b363SPhilipp Reisner } 3036b411b363SPhilipp Reisner put_ldev(mdev); 3037b411b363SPhilipp Reisner } 3038b411b363SPhilipp Reisner #undef min_not_zero 3039b411b363SPhilipp Reisner 3040e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3041b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3042e89b591cSPhilipp Reisner dd = drbd_determin_dev_size(mdev, ddsf); 3043b411b363SPhilipp Reisner put_ldev(mdev); 3044b411b363SPhilipp Reisner if (dd == dev_size_error) 3045b411b363SPhilipp Reisner return FALSE; 3046b411b363SPhilipp Reisner drbd_md_sync(mdev); 3047b411b363SPhilipp Reisner } else { 3048b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3049b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3050b411b363SPhilipp Reisner } 3051b411b363SPhilipp Reisner 3052b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3053b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3054b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3055b411b363SPhilipp Reisner ldsc = 1; 3056b411b363SPhilipp Reisner } 3057b411b363SPhilipp Reisner 3058a1c88d0dSLars Ellenberg if (mdev->agreed_pro_version < 94) 3059b411b363SPhilipp Reisner max_seg_s = be32_to_cpu(p->max_segment_size); 3060a1c88d0dSLars Ellenberg else /* drbd 8.3.8 onwards */ 3061a1c88d0dSLars Ellenberg max_seg_s = DRBD_MAX_SEGMENT_SIZE; 3062a1c88d0dSLars Ellenberg 3063b411b363SPhilipp Reisner if (max_seg_s != queue_max_segment_size(mdev->rq_queue)) 3064b411b363SPhilipp Reisner drbd_setup_queue_param(mdev, max_seg_s); 3065b411b363SPhilipp Reisner 3066e89b591cSPhilipp Reisner drbd_setup_order_type(mdev, be16_to_cpu(p->queue_order_type)); 3067b411b363SPhilipp Reisner put_ldev(mdev); 3068b411b363SPhilipp Reisner } 3069b411b363SPhilipp Reisner 3070b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3071b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3072b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3073b411b363SPhilipp Reisner /* we have different sizes, probably peer 3074b411b363SPhilipp Reisner * needs to know my new size... */ 3075e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3076b411b363SPhilipp Reisner } 3077b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3078b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3079b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3080e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3081e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3082e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3083b411b363SPhilipp Reisner else 3084e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3085e89b591cSPhilipp Reisner } else 3086b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3087b411b363SPhilipp Reisner } 3088b411b363SPhilipp Reisner } 3089b411b363SPhilipp Reisner 3090b411b363SPhilipp Reisner return TRUE; 3091b411b363SPhilipp Reisner } 3092b411b363SPhilipp Reisner 3093b411b363SPhilipp Reisner static int receive_uuids(struct drbd_conf *mdev, struct p_header *h) 3094b411b363SPhilipp Reisner { 3095b411b363SPhilipp Reisner struct p_uuids *p = (struct p_uuids *)h; 3096b411b363SPhilipp Reisner u64 *p_uuid; 3097b411b363SPhilipp Reisner int i; 3098b411b363SPhilipp Reisner 3099b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; 3100b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, h->length) != h->length) 3101b411b363SPhilipp Reisner return FALSE; 3102b411b363SPhilipp Reisner 3103b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3104b411b363SPhilipp Reisner 3105b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3106b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3107b411b363SPhilipp Reisner 3108b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3109b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3110b411b363SPhilipp Reisner 3111b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3112b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3113b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3114b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3115b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3116b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 3117b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3118b411b363SPhilipp Reisner return FALSE; 3119b411b363SPhilipp Reisner } 3120b411b363SPhilipp Reisner 3121b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3122b411b363SPhilipp Reisner int skip_initial_sync = 3123b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 3124b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90 && 3125b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3126b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3127b411b363SPhilipp Reisner if (skip_initial_sync) { 3128b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3129b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 3130b411b363SPhilipp Reisner "clear_n_write from receive_uuids"); 3131b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3132b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3133b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3134b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3135b411b363SPhilipp Reisner drbd_md_sync(mdev); 3136b411b363SPhilipp Reisner } 3137b411b363SPhilipp Reisner put_ldev(mdev); 313818a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 313918a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 314018a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 314118a50fa2SPhilipp Reisner for me. */ 314218a50fa2SPhilipp Reisner drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3143b411b363SPhilipp Reisner } 3144b411b363SPhilipp Reisner 3145b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3146b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3147b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3148b411b363SPhilipp Reisner new disk state... */ 3149b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); 3150b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 3151b411b363SPhilipp Reisner drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3152b411b363SPhilipp Reisner 3153b411b363SPhilipp Reisner return TRUE; 3154b411b363SPhilipp Reisner } 3155b411b363SPhilipp Reisner 3156b411b363SPhilipp Reisner /** 3157b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3158b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3159b411b363SPhilipp Reisner */ 3160b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3161b411b363SPhilipp Reisner { 3162b411b363SPhilipp Reisner union drbd_state ms; 3163b411b363SPhilipp Reisner 3164b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3165b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3166b411b363SPhilipp Reisner 3167b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3168b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3169b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3170b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3171b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3172b411b363SPhilipp Reisner }; 3173b411b363SPhilipp Reisner 3174b411b363SPhilipp Reisner ms.i = ps.i; 3175b411b363SPhilipp Reisner 3176b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3177b411b363SPhilipp Reisner ms.peer = ps.role; 3178b411b363SPhilipp Reisner ms.role = ps.peer; 3179b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3180b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3181b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3182b411b363SPhilipp Reisner 3183b411b363SPhilipp Reisner return ms; 3184b411b363SPhilipp Reisner } 3185b411b363SPhilipp Reisner 3186b411b363SPhilipp Reisner static int receive_req_state(struct drbd_conf *mdev, struct p_header *h) 3187b411b363SPhilipp Reisner { 3188b411b363SPhilipp Reisner struct p_req_state *p = (struct p_req_state *)h; 3189b411b363SPhilipp Reisner union drbd_state mask, val; 3190b411b363SPhilipp Reisner int rv; 3191b411b363SPhilipp Reisner 3192b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; 3193b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, h->length) != h->length) 3194b411b363SPhilipp Reisner return FALSE; 3195b411b363SPhilipp Reisner 3196b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3197b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3198b411b363SPhilipp Reisner 3199b411b363SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->flags) && 3200b411b363SPhilipp Reisner test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { 3201b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 3202b411b363SPhilipp Reisner return TRUE; 3203b411b363SPhilipp Reisner } 3204b411b363SPhilipp Reisner 3205b411b363SPhilipp Reisner mask = convert_state(mask); 3206b411b363SPhilipp Reisner val = convert_state(val); 3207b411b363SPhilipp Reisner 3208b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3209b411b363SPhilipp Reisner 3210b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3211b411b363SPhilipp Reisner drbd_md_sync(mdev); 3212b411b363SPhilipp Reisner 3213b411b363SPhilipp Reisner return TRUE; 3214b411b363SPhilipp Reisner } 3215b411b363SPhilipp Reisner 3216b411b363SPhilipp Reisner static int receive_state(struct drbd_conf *mdev, struct p_header *h) 3217b411b363SPhilipp Reisner { 3218b411b363SPhilipp Reisner struct p_state *p = (struct p_state *)h; 3219b411b363SPhilipp Reisner enum drbd_conns nconn, oconn; 3220b411b363SPhilipp Reisner union drbd_state ns, peer_state; 3221b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 322265d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3223b411b363SPhilipp Reisner int rv; 3224b411b363SPhilipp Reisner 3225b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) 3226b411b363SPhilipp Reisner return FALSE; 3227b411b363SPhilipp Reisner 3228b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, h->length) != h->length) 3229b411b363SPhilipp Reisner return FALSE; 3230b411b363SPhilipp Reisner 3231b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3232b411b363SPhilipp Reisner 3233b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3234b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3235b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3236b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3237b411b363SPhilipp Reisner } 3238b411b363SPhilipp Reisner 3239b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3240b411b363SPhilipp Reisner retry: 3241b411b363SPhilipp Reisner oconn = nconn = mdev->state.conn; 3242b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3243b411b363SPhilipp Reisner 3244b411b363SPhilipp Reisner if (nconn == C_WF_REPORT_PARAMS) 3245b411b363SPhilipp Reisner nconn = C_CONNECTED; 3246b411b363SPhilipp Reisner 3247b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3248b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3249b411b363SPhilipp Reisner int cr; /* consider resync */ 3250b411b363SPhilipp Reisner 3251b411b363SPhilipp Reisner /* if we established a new connection */ 3252b411b363SPhilipp Reisner cr = (oconn < C_CONNECTED); 3253b411b363SPhilipp Reisner /* if we had an established connection 3254b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 3255b411b363SPhilipp Reisner cr |= (oconn == C_CONNECTED && 3256b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 3257b411b363SPhilipp Reisner mdev->state.disk == D_NEGOTIATING)); 3258b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3259b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3260b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3261b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3262b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 3263b411b363SPhilipp Reisner cr |= (oconn == C_CONNECTED && 3264b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3265b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3266b411b363SPhilipp Reisner 3267b411b363SPhilipp Reisner if (cr) 3268b411b363SPhilipp Reisner nconn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3269b411b363SPhilipp Reisner 3270b411b363SPhilipp Reisner put_ldev(mdev); 3271b411b363SPhilipp Reisner if (nconn == C_MASK) { 3272580b9767SLars Ellenberg nconn = C_CONNECTED; 3273b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 3274b411b363SPhilipp Reisner drbd_force_state(mdev, NS(disk, D_DISKLESS)); 3275b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3276b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3277b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3278580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3279b411b363SPhilipp Reisner } else { 3280cf14c2e9SPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) 3281cf14c2e9SPhilipp Reisner return FALSE; 3282b411b363SPhilipp Reisner D_ASSERT(oconn == C_WF_REPORT_PARAMS); 3283b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3284b411b363SPhilipp Reisner return FALSE; 3285b411b363SPhilipp Reisner } 3286b411b363SPhilipp Reisner } 3287b411b363SPhilipp Reisner } 3288b411b363SPhilipp Reisner 3289b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3290b411b363SPhilipp Reisner if (mdev->state.conn != oconn) 3291b411b363SPhilipp Reisner goto retry; 3292b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3293b411b363SPhilipp Reisner ns.i = mdev->state.i; 3294b411b363SPhilipp Reisner ns.conn = nconn; 3295b411b363SPhilipp Reisner ns.peer = peer_state.role; 3296b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3297b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 3298b411b363SPhilipp Reisner if ((nconn == C_CONNECTED || nconn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3299b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 330065d922c3SPhilipp Reisner cs_flags = CS_VERBOSE + (oconn < C_CONNECTED && nconn >= C_CONNECTED ? 0 : CS_HARD); 3301481c6f50SPhilipp Reisner if (ns.pdsk == D_CONSISTENT && ns.susp && nconn == C_CONNECTED && oconn < C_CONNECTED && 3302481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 3303481c6f50SPhilipp Reisner /* Do not allow tl_restart(resend) for a rebooted peer. We can only allow this 3304481c6f50SPhilipp Reisner for temporal network outages! */ 3305481c6f50SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3306481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 3307481c6f50SPhilipp Reisner tl_clear(mdev); 3308481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3309481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 3310481c6f50SPhilipp Reisner drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0)); 3311481c6f50SPhilipp Reisner return FALSE; 3312481c6f50SPhilipp Reisner } 331365d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 3314b411b363SPhilipp Reisner ns = mdev->state; 3315b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3316b411b363SPhilipp Reisner 3317b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 3318b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3319b411b363SPhilipp Reisner return FALSE; 3320b411b363SPhilipp Reisner } 3321b411b363SPhilipp Reisner 3322b411b363SPhilipp Reisner if (oconn > C_WF_REPORT_PARAMS) { 3323b411b363SPhilipp Reisner if (nconn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3324b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3325b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3326b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3327b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3328b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3329b411b363SPhilipp Reisner drbd_send_state(mdev); 3330b411b363SPhilipp Reisner } 3331b411b363SPhilipp Reisner } 3332b411b363SPhilipp Reisner 3333b411b363SPhilipp Reisner mdev->net_conf->want_lose = 0; 3334b411b363SPhilipp Reisner 3335b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3336b411b363SPhilipp Reisner 3337b411b363SPhilipp Reisner return TRUE; 3338b411b363SPhilipp Reisner } 3339b411b363SPhilipp Reisner 3340b411b363SPhilipp Reisner static int receive_sync_uuid(struct drbd_conf *mdev, struct p_header *h) 3341b411b363SPhilipp Reisner { 3342b411b363SPhilipp Reisner struct p_rs_uuid *p = (struct p_rs_uuid *)h; 3343b411b363SPhilipp Reisner 3344b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3345b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3346b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3347b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3348b411b363SPhilipp Reisner 3349b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3350b411b363SPhilipp Reisner 3351b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; 3352b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, h->length) != h->length) 3353b411b363SPhilipp Reisner return FALSE; 3354b411b363SPhilipp Reisner 3355b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3356b411b363SPhilipp Reisner _not_ be rotated into the history */ 3357b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3358b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3359b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3360b411b363SPhilipp Reisner 3361b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3362b411b363SPhilipp Reisner 3363b411b363SPhilipp Reisner put_ldev(mdev); 3364b411b363SPhilipp Reisner } else 3365b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3366b411b363SPhilipp Reisner 3367b411b363SPhilipp Reisner return TRUE; 3368b411b363SPhilipp Reisner } 3369b411b363SPhilipp Reisner 3370b411b363SPhilipp Reisner enum receive_bitmap_ret { OK, DONE, FAILED }; 3371b411b363SPhilipp Reisner 3372b411b363SPhilipp Reisner static enum receive_bitmap_ret 3373b411b363SPhilipp Reisner receive_bitmap_plain(struct drbd_conf *mdev, struct p_header *h, 3374b411b363SPhilipp Reisner unsigned long *buffer, struct bm_xfer_ctx *c) 3375b411b363SPhilipp Reisner { 3376b411b363SPhilipp Reisner unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); 3377b411b363SPhilipp Reisner unsigned want = num_words * sizeof(long); 3378b411b363SPhilipp Reisner 3379b411b363SPhilipp Reisner if (want != h->length) { 3380b411b363SPhilipp Reisner dev_err(DEV, "%s:want (%u) != h->length (%u)\n", __func__, want, h->length); 3381b411b363SPhilipp Reisner return FAILED; 3382b411b363SPhilipp Reisner } 3383b411b363SPhilipp Reisner if (want == 0) 3384b411b363SPhilipp Reisner return DONE; 3385b411b363SPhilipp Reisner if (drbd_recv(mdev, buffer, want) != want) 3386b411b363SPhilipp Reisner return FAILED; 3387b411b363SPhilipp Reisner 3388b411b363SPhilipp Reisner drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); 3389b411b363SPhilipp Reisner 3390b411b363SPhilipp Reisner c->word_offset += num_words; 3391b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3392b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3393b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3394b411b363SPhilipp Reisner 3395b411b363SPhilipp Reisner return OK; 3396b411b363SPhilipp Reisner } 3397b411b363SPhilipp Reisner 3398b411b363SPhilipp Reisner static enum receive_bitmap_ret 3399b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3400b411b363SPhilipp Reisner struct p_compressed_bm *p, 3401b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3402b411b363SPhilipp Reisner { 3403b411b363SPhilipp Reisner struct bitstream bs; 3404b411b363SPhilipp Reisner u64 look_ahead; 3405b411b363SPhilipp Reisner u64 rl; 3406b411b363SPhilipp Reisner u64 tmp; 3407b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3408b411b363SPhilipp Reisner unsigned long e; 3409b411b363SPhilipp Reisner int len = p->head.length - (sizeof(*p) - sizeof(p->head)); 3410b411b363SPhilipp Reisner int toggle = DCBP_get_start(p); 3411b411b363SPhilipp Reisner int have; 3412b411b363SPhilipp Reisner int bits; 3413b411b363SPhilipp Reisner 3414b411b363SPhilipp Reisner bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); 3415b411b363SPhilipp Reisner 3416b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3417b411b363SPhilipp Reisner if (bits < 0) 3418b411b363SPhilipp Reisner return FAILED; 3419b411b363SPhilipp Reisner 3420b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3421b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3422b411b363SPhilipp Reisner if (bits <= 0) 3423b411b363SPhilipp Reisner return FAILED; 3424b411b363SPhilipp Reisner 3425b411b363SPhilipp Reisner if (toggle) { 3426b411b363SPhilipp Reisner e = s + rl -1; 3427b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3428b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 3429b411b363SPhilipp Reisner return FAILED; 3430b411b363SPhilipp Reisner } 3431b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3432b411b363SPhilipp Reisner } 3433b411b363SPhilipp Reisner 3434b411b363SPhilipp Reisner if (have < bits) { 3435b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3436b411b363SPhilipp Reisner have, bits, look_ahead, 3437b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3438b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 3439b411b363SPhilipp Reisner return FAILED; 3440b411b363SPhilipp Reisner } 3441b411b363SPhilipp Reisner look_ahead >>= bits; 3442b411b363SPhilipp Reisner have -= bits; 3443b411b363SPhilipp Reisner 3444b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3445b411b363SPhilipp Reisner if (bits < 0) 3446b411b363SPhilipp Reisner return FAILED; 3447b411b363SPhilipp Reisner look_ahead |= tmp << have; 3448b411b363SPhilipp Reisner have += bits; 3449b411b363SPhilipp Reisner } 3450b411b363SPhilipp Reisner 3451b411b363SPhilipp Reisner c->bit_offset = s; 3452b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3453b411b363SPhilipp Reisner 3454b411b363SPhilipp Reisner return (s == c->bm_bits) ? DONE : OK; 3455b411b363SPhilipp Reisner } 3456b411b363SPhilipp Reisner 3457b411b363SPhilipp Reisner static enum receive_bitmap_ret 3458b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3459b411b363SPhilipp Reisner struct p_compressed_bm *p, 3460b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3461b411b363SPhilipp Reisner { 3462b411b363SPhilipp Reisner if (DCBP_get_code(p) == RLE_VLI_Bits) 3463b411b363SPhilipp Reisner return recv_bm_rle_bits(mdev, p, c); 3464b411b363SPhilipp Reisner 3465b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3466b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3467b411b363SPhilipp Reisner * during all our tests. */ 3468b411b363SPhilipp Reisner 3469b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 3470b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3471b411b363SPhilipp Reisner return FAILED; 3472b411b363SPhilipp Reisner } 3473b411b363SPhilipp Reisner 3474b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3475b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3476b411b363SPhilipp Reisner { 3477b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 3478b411b363SPhilipp Reisner unsigned plain = sizeof(struct p_header) * 3479b411b363SPhilipp Reisner ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) 3480b411b363SPhilipp Reisner + c->bm_words * sizeof(long); 3481b411b363SPhilipp Reisner unsigned total = c->bytes[0] + c->bytes[1]; 3482b411b363SPhilipp Reisner unsigned r; 3483b411b363SPhilipp Reisner 3484b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3485b411b363SPhilipp Reisner if (total == 0) 3486b411b363SPhilipp Reisner return; 3487b411b363SPhilipp Reisner 3488b411b363SPhilipp Reisner /* don't report if not compressed */ 3489b411b363SPhilipp Reisner if (total >= plain) 3490b411b363SPhilipp Reisner return; 3491b411b363SPhilipp Reisner 3492b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3493b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3494b411b363SPhilipp Reisner : (1000 * total / plain); 3495b411b363SPhilipp Reisner 3496b411b363SPhilipp Reisner if (r > 1000) 3497b411b363SPhilipp Reisner r = 1000; 3498b411b363SPhilipp Reisner 3499b411b363SPhilipp Reisner r = 1000 - r; 3500b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3501b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3502b411b363SPhilipp Reisner direction, 3503b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3504b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3505b411b363SPhilipp Reisner total, r/10, r % 10); 3506b411b363SPhilipp Reisner } 3507b411b363SPhilipp Reisner 3508b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3509b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3510b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3511b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3512b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3513b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3514b411b363SPhilipp Reisner 3515b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 3516b411b363SPhilipp Reisner static int receive_bitmap(struct drbd_conf *mdev, struct p_header *h) 3517b411b363SPhilipp Reisner { 3518b411b363SPhilipp Reisner struct bm_xfer_ctx c; 3519b411b363SPhilipp Reisner void *buffer; 3520b411b363SPhilipp Reisner enum receive_bitmap_ret ret; 3521b411b363SPhilipp Reisner int ok = FALSE; 3522b411b363SPhilipp Reisner 3523b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); 3524b411b363SPhilipp Reisner 3525b411b363SPhilipp Reisner drbd_bm_lock(mdev, "receive bitmap"); 3526b411b363SPhilipp Reisner 3527b411b363SPhilipp Reisner /* maybe we should use some per thread scratch page, 3528b411b363SPhilipp Reisner * and allocate that during initial device creation? */ 3529b411b363SPhilipp Reisner buffer = (unsigned long *) __get_free_page(GFP_NOIO); 3530b411b363SPhilipp Reisner if (!buffer) { 3531b411b363SPhilipp Reisner dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); 3532b411b363SPhilipp Reisner goto out; 3533b411b363SPhilipp Reisner } 3534b411b363SPhilipp Reisner 3535b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3536b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3537b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3538b411b363SPhilipp Reisner }; 3539b411b363SPhilipp Reisner 3540b411b363SPhilipp Reisner do { 3541b411b363SPhilipp Reisner if (h->command == P_BITMAP) { 3542b411b363SPhilipp Reisner ret = receive_bitmap_plain(mdev, h, buffer, &c); 3543b411b363SPhilipp Reisner } else if (h->command == P_COMPRESSED_BITMAP) { 3544b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3545b411b363SPhilipp Reisner * and the feature is enabled! */ 3546b411b363SPhilipp Reisner struct p_compressed_bm *p; 3547b411b363SPhilipp Reisner 3548b411b363SPhilipp Reisner if (h->length > BM_PACKET_PAYLOAD_BYTES) { 3549b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 3550b411b363SPhilipp Reisner goto out; 3551b411b363SPhilipp Reisner } 3552b411b363SPhilipp Reisner /* use the page buff */ 3553b411b363SPhilipp Reisner p = buffer; 3554b411b363SPhilipp Reisner memcpy(p, h, sizeof(*h)); 3555b411b363SPhilipp Reisner if (drbd_recv(mdev, p->head.payload, h->length) != h->length) 3556b411b363SPhilipp Reisner goto out; 3557b411b363SPhilipp Reisner if (p->head.length <= (sizeof(*p) - sizeof(p->head))) { 3558b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", p->head.length); 3559b411b363SPhilipp Reisner return FAILED; 3560b411b363SPhilipp Reisner } 3561b411b363SPhilipp Reisner ret = decode_bitmap_c(mdev, p, &c); 3562b411b363SPhilipp Reisner } else { 3563b411b363SPhilipp Reisner dev_warn(DEV, "receive_bitmap: h->command neither ReportBitMap nor ReportCBitMap (is 0x%x)", h->command); 3564b411b363SPhilipp Reisner goto out; 3565b411b363SPhilipp Reisner } 3566b411b363SPhilipp Reisner 3567b411b363SPhilipp Reisner c.packets[h->command == P_BITMAP]++; 3568b411b363SPhilipp Reisner c.bytes[h->command == P_BITMAP] += sizeof(struct p_header) + h->length; 3569b411b363SPhilipp Reisner 3570b411b363SPhilipp Reisner if (ret != OK) 3571b411b363SPhilipp Reisner break; 3572b411b363SPhilipp Reisner 3573b411b363SPhilipp Reisner if (!drbd_recv_header(mdev, h)) 3574b411b363SPhilipp Reisner goto out; 3575b411b363SPhilipp Reisner } while (ret == OK); 3576b411b363SPhilipp Reisner if (ret == FAILED) 3577b411b363SPhilipp Reisner goto out; 3578b411b363SPhilipp Reisner 3579b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 3580b411b363SPhilipp Reisner 3581b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 3582b411b363SPhilipp Reisner ok = !drbd_send_bitmap(mdev); 3583b411b363SPhilipp Reisner if (!ok) 3584b411b363SPhilipp Reisner goto out; 3585b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 3586b411b363SPhilipp Reisner ok = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 3587b411b363SPhilipp Reisner D_ASSERT(ok == SS_SUCCESS); 3588b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 3589b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 3590b411b363SPhilipp Reisner * other threads may have noticed network errors */ 3591b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 3592b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3593b411b363SPhilipp Reisner } 3594b411b363SPhilipp Reisner 3595b411b363SPhilipp Reisner ok = TRUE; 3596b411b363SPhilipp Reisner out: 3597b411b363SPhilipp Reisner drbd_bm_unlock(mdev); 3598b411b363SPhilipp Reisner if (ok && mdev->state.conn == C_WF_BITMAP_S) 3599b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 3600b411b363SPhilipp Reisner free_page((unsigned long) buffer); 3601b411b363SPhilipp Reisner return ok; 3602b411b363SPhilipp Reisner } 3603b411b363SPhilipp Reisner 3604e7f52dfbSLars Ellenberg static int receive_skip_(struct drbd_conf *mdev, struct p_header *h, int silent) 3605b411b363SPhilipp Reisner { 3606b411b363SPhilipp Reisner /* TODO zero copy sink :) */ 3607b411b363SPhilipp Reisner static char sink[128]; 3608b411b363SPhilipp Reisner int size, want, r; 3609b411b363SPhilipp Reisner 3610e7f52dfbSLars Ellenberg if (!silent) 3611b411b363SPhilipp Reisner dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", 3612b411b363SPhilipp Reisner h->command, h->length); 3613b411b363SPhilipp Reisner 3614b411b363SPhilipp Reisner size = h->length; 3615b411b363SPhilipp Reisner while (size > 0) { 3616b411b363SPhilipp Reisner want = min_t(int, size, sizeof(sink)); 3617b411b363SPhilipp Reisner r = drbd_recv(mdev, sink, want); 3618b411b363SPhilipp Reisner ERR_IF(r <= 0) break; 3619b411b363SPhilipp Reisner size -= r; 3620b411b363SPhilipp Reisner } 3621b411b363SPhilipp Reisner return size == 0; 3622b411b363SPhilipp Reisner } 3623b411b363SPhilipp Reisner 3624e7f52dfbSLars Ellenberg static int receive_skip(struct drbd_conf *mdev, struct p_header *h) 3625e7f52dfbSLars Ellenberg { 3626e7f52dfbSLars Ellenberg return receive_skip_(mdev, h, 0); 3627e7f52dfbSLars Ellenberg } 3628e7f52dfbSLars Ellenberg 3629e7f52dfbSLars Ellenberg static int receive_skip_silent(struct drbd_conf *mdev, struct p_header *h) 3630e7f52dfbSLars Ellenberg { 3631e7f52dfbSLars Ellenberg return receive_skip_(mdev, h, 1); 3632e7f52dfbSLars Ellenberg } 3633e7f52dfbSLars Ellenberg 3634b411b363SPhilipp Reisner static int receive_UnplugRemote(struct drbd_conf *mdev, struct p_header *h) 3635b411b363SPhilipp Reisner { 3636b411b363SPhilipp Reisner if (mdev->state.disk >= D_INCONSISTENT) 3637b411b363SPhilipp Reisner drbd_kick_lo(mdev); 3638b411b363SPhilipp Reisner 3639b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 3640b411b363SPhilipp Reisner * with the data requests being unplugged */ 3641b411b363SPhilipp Reisner drbd_tcp_quickack(mdev->data.socket); 3642b411b363SPhilipp Reisner 3643b411b363SPhilipp Reisner return TRUE; 3644b411b363SPhilipp Reisner } 3645b411b363SPhilipp Reisner 3646b411b363SPhilipp Reisner typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, struct p_header *); 3647b411b363SPhilipp Reisner 3648b411b363SPhilipp Reisner static drbd_cmd_handler_f drbd_default_handler[] = { 3649b411b363SPhilipp Reisner [P_DATA] = receive_Data, 3650b411b363SPhilipp Reisner [P_DATA_REPLY] = receive_DataReply, 3651b411b363SPhilipp Reisner [P_RS_DATA_REPLY] = receive_RSDataReply, 3652b411b363SPhilipp Reisner [P_BARRIER] = receive_Barrier, 3653b411b363SPhilipp Reisner [P_BITMAP] = receive_bitmap, 3654b411b363SPhilipp Reisner [P_COMPRESSED_BITMAP] = receive_bitmap, 3655b411b363SPhilipp Reisner [P_UNPLUG_REMOTE] = receive_UnplugRemote, 3656b411b363SPhilipp Reisner [P_DATA_REQUEST] = receive_DataRequest, 3657b411b363SPhilipp Reisner [P_RS_DATA_REQUEST] = receive_DataRequest, 3658b411b363SPhilipp Reisner [P_SYNC_PARAM] = receive_SyncParam, 3659b411b363SPhilipp Reisner [P_SYNC_PARAM89] = receive_SyncParam, 3660b411b363SPhilipp Reisner [P_PROTOCOL] = receive_protocol, 3661b411b363SPhilipp Reisner [P_UUIDS] = receive_uuids, 3662b411b363SPhilipp Reisner [P_SIZES] = receive_sizes, 3663b411b363SPhilipp Reisner [P_STATE] = receive_state, 3664b411b363SPhilipp Reisner [P_STATE_CHG_REQ] = receive_req_state, 3665b411b363SPhilipp Reisner [P_SYNC_UUID] = receive_sync_uuid, 3666b411b363SPhilipp Reisner [P_OV_REQUEST] = receive_DataRequest, 3667b411b363SPhilipp Reisner [P_OV_REPLY] = receive_DataRequest, 3668b411b363SPhilipp Reisner [P_CSUM_RS_REQUEST] = receive_DataRequest, 3669e7f52dfbSLars Ellenberg [P_DELAY_PROBE] = receive_skip_silent, 3670b411b363SPhilipp Reisner /* anything missing from this table is in 3671b411b363SPhilipp Reisner * the asender_tbl, see get_asender_cmd */ 3672b411b363SPhilipp Reisner [P_MAX_CMD] = NULL, 3673b411b363SPhilipp Reisner }; 3674b411b363SPhilipp Reisner 3675b411b363SPhilipp Reisner static drbd_cmd_handler_f *drbd_cmd_handler = drbd_default_handler; 3676b411b363SPhilipp Reisner static drbd_cmd_handler_f *drbd_opt_cmd_handler; 3677b411b363SPhilipp Reisner 3678b411b363SPhilipp Reisner static void drbdd(struct drbd_conf *mdev) 3679b411b363SPhilipp Reisner { 3680b411b363SPhilipp Reisner drbd_cmd_handler_f handler; 3681b411b363SPhilipp Reisner struct p_header *header = &mdev->data.rbuf.header; 3682b411b363SPhilipp Reisner 3683b411b363SPhilipp Reisner while (get_t_state(&mdev->receiver) == Running) { 3684b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 36850b33a916SLars Ellenberg if (!drbd_recv_header(mdev, header)) { 36860b33a916SLars Ellenberg drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3687b411b363SPhilipp Reisner break; 36880b33a916SLars Ellenberg } 3689b411b363SPhilipp Reisner 3690b411b363SPhilipp Reisner if (header->command < P_MAX_CMD) 3691b411b363SPhilipp Reisner handler = drbd_cmd_handler[header->command]; 3692b411b363SPhilipp Reisner else if (P_MAY_IGNORE < header->command 3693b411b363SPhilipp Reisner && header->command < P_MAX_OPT_CMD) 3694b411b363SPhilipp Reisner handler = drbd_opt_cmd_handler[header->command-P_MAY_IGNORE]; 3695b411b363SPhilipp Reisner else if (header->command > P_MAX_OPT_CMD) 3696b411b363SPhilipp Reisner handler = receive_skip; 3697b411b363SPhilipp Reisner else 3698b411b363SPhilipp Reisner handler = NULL; 3699b411b363SPhilipp Reisner 3700b411b363SPhilipp Reisner if (unlikely(!handler)) { 3701b411b363SPhilipp Reisner dev_err(DEV, "unknown packet type %d, l: %d!\n", 3702b411b363SPhilipp Reisner header->command, header->length); 3703b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3704b411b363SPhilipp Reisner break; 3705b411b363SPhilipp Reisner } 3706b411b363SPhilipp Reisner if (unlikely(!handler(mdev, header))) { 3707b411b363SPhilipp Reisner dev_err(DEV, "error receiving %s, l: %d!\n", 3708b411b363SPhilipp Reisner cmdname(header->command), header->length); 3709b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3710b411b363SPhilipp Reisner break; 3711b411b363SPhilipp Reisner } 3712b411b363SPhilipp Reisner } 3713b411b363SPhilipp Reisner } 3714b411b363SPhilipp Reisner 3715b411b363SPhilipp Reisner void drbd_flush_workqueue(struct drbd_conf *mdev) 3716b411b363SPhilipp Reisner { 3717b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 3718b411b363SPhilipp Reisner 3719b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 3720b411b363SPhilipp Reisner init_completion(&barr.done); 3721b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, &barr.w); 3722b411b363SPhilipp Reisner wait_for_completion(&barr.done); 3723b411b363SPhilipp Reisner } 3724b411b363SPhilipp Reisner 3725f70b3511SPhilipp Reisner void drbd_free_tl_hash(struct drbd_conf *mdev) 3726f70b3511SPhilipp Reisner { 3727f70b3511SPhilipp Reisner struct hlist_head *h; 3728f70b3511SPhilipp Reisner 3729f70b3511SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3730f70b3511SPhilipp Reisner 3731f70b3511SPhilipp Reisner if (!mdev->tl_hash || mdev->state.conn != C_STANDALONE) { 3732f70b3511SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3733f70b3511SPhilipp Reisner return; 3734f70b3511SPhilipp Reisner } 3735f70b3511SPhilipp Reisner /* paranoia code */ 3736f70b3511SPhilipp Reisner for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++) 3737f70b3511SPhilipp Reisner if (h->first) 3738f70b3511SPhilipp Reisner dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n", 3739f70b3511SPhilipp Reisner (int)(h - mdev->ee_hash), h->first); 3740f70b3511SPhilipp Reisner kfree(mdev->ee_hash); 3741f70b3511SPhilipp Reisner mdev->ee_hash = NULL; 3742f70b3511SPhilipp Reisner mdev->ee_hash_s = 0; 3743f70b3511SPhilipp Reisner 3744f70b3511SPhilipp Reisner /* paranoia code */ 3745f70b3511SPhilipp Reisner for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++) 3746f70b3511SPhilipp Reisner if (h->first) 3747f70b3511SPhilipp Reisner dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n", 3748f70b3511SPhilipp Reisner (int)(h - mdev->tl_hash), h->first); 3749f70b3511SPhilipp Reisner kfree(mdev->tl_hash); 3750f70b3511SPhilipp Reisner mdev->tl_hash = NULL; 3751f70b3511SPhilipp Reisner mdev->tl_hash_s = 0; 3752f70b3511SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3753f70b3511SPhilipp Reisner } 3754f70b3511SPhilipp Reisner 3755b411b363SPhilipp Reisner static void drbd_disconnect(struct drbd_conf *mdev) 3756b411b363SPhilipp Reisner { 3757b411b363SPhilipp Reisner enum drbd_fencing_p fp; 3758b411b363SPhilipp Reisner union drbd_state os, ns; 3759b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 3760b411b363SPhilipp Reisner unsigned int i; 3761b411b363SPhilipp Reisner 3762b411b363SPhilipp Reisner if (mdev->state.conn == C_STANDALONE) 3763b411b363SPhilipp Reisner return; 3764b411b363SPhilipp Reisner if (mdev->state.conn >= C_WF_CONNECTION) 3765b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED cstate = %s, expected < WFConnection\n", 3766b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3767b411b363SPhilipp Reisner 3768b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 3769b411b363SPhilipp Reisner drbd_thread_stop(&mdev->asender); 3770b411b363SPhilipp Reisner drbd_free_sock(mdev); 3771b411b363SPhilipp Reisner 3772b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3773b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 3774b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 3775b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 3776b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3777b411b363SPhilipp Reisner 3778b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 3779b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 3780b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 3781b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 3782b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 3783b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 3784b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 3785b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 3786b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 3787b411b363SPhilipp Reisner * on the fly. */ 3788b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 3789b411b363SPhilipp Reisner mdev->rs_total = 0; 3790b411b363SPhilipp Reisner mdev->rs_failed = 0; 3791b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 3792b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 3793b411b363SPhilipp Reisner 3794b411b363SPhilipp Reisner /* make sure syncer is stopped and w_resume_next_sg queued */ 3795b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 3796b411b363SPhilipp Reisner set_bit(STOP_SYNC_TIMER, &mdev->flags); 3797b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 3798b411b363SPhilipp Reisner 3799b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 3800b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 3801b411b363SPhilipp Reisner * to be "canceled" */ 3802b411b363SPhilipp Reisner drbd_flush_workqueue(mdev); 3803b411b363SPhilipp Reisner 3804b411b363SPhilipp Reisner /* This also does reclaim_net_ee(). If we do this too early, we might 3805b411b363SPhilipp Reisner * miss some resync ee and pages.*/ 3806b411b363SPhilipp Reisner drbd_process_done_ee(mdev); 3807b411b363SPhilipp Reisner 3808b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3809b411b363SPhilipp Reisner mdev->p_uuid = NULL; 3810b411b363SPhilipp Reisner 3811b411b363SPhilipp Reisner if (!mdev->state.susp) 3812b411b363SPhilipp Reisner tl_clear(mdev); 3813b411b363SPhilipp Reisner 3814b411b363SPhilipp Reisner dev_info(DEV, "Connection closed\n"); 3815b411b363SPhilipp Reisner 3816b411b363SPhilipp Reisner drbd_md_sync(mdev); 3817b411b363SPhilipp Reisner 3818b411b363SPhilipp Reisner fp = FP_DONT_CARE; 3819b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3820b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 3821b411b363SPhilipp Reisner put_ldev(mdev); 3822b411b363SPhilipp Reisner } 3823b411b363SPhilipp Reisner 382487f7be4cSPhilipp Reisner if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) 382587f7be4cSPhilipp Reisner drbd_try_outdate_peer_async(mdev); 3826b411b363SPhilipp Reisner 3827b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3828b411b363SPhilipp Reisner os = mdev->state; 3829b411b363SPhilipp Reisner if (os.conn >= C_UNCONNECTED) { 3830b411b363SPhilipp Reisner /* Do not restart in case we are C_DISCONNECTING */ 3831b411b363SPhilipp Reisner ns = os; 3832b411b363SPhilipp Reisner ns.conn = C_UNCONNECTED; 3833b411b363SPhilipp Reisner rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 3834b411b363SPhilipp Reisner } 3835b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3836b411b363SPhilipp Reisner 3837b411b363SPhilipp Reisner if (os.conn == C_DISCONNECTING) { 383884dfb9f5SPhilipp Reisner wait_event(mdev->net_cnt_wait, atomic_read(&mdev->net_cnt) == 0); 3839b411b363SPhilipp Reisner 3840f70b3511SPhilipp Reisner if (!mdev->state.susp) { 3841b411b363SPhilipp Reisner /* we must not free the tl_hash 3842b411b363SPhilipp Reisner * while application io is still on the fly */ 3843f70b3511SPhilipp Reisner wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); 3844f70b3511SPhilipp Reisner drbd_free_tl_hash(mdev); 3845f70b3511SPhilipp Reisner } 3846b411b363SPhilipp Reisner 3847b411b363SPhilipp Reisner crypto_free_hash(mdev->cram_hmac_tfm); 3848b411b363SPhilipp Reisner mdev->cram_hmac_tfm = NULL; 3849b411b363SPhilipp Reisner 3850b411b363SPhilipp Reisner kfree(mdev->net_conf); 3851b411b363SPhilipp Reisner mdev->net_conf = NULL; 3852b411b363SPhilipp Reisner drbd_request_state(mdev, NS(conn, C_STANDALONE)); 3853b411b363SPhilipp Reisner } 3854b411b363SPhilipp Reisner 3855b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 3856b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 3857b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 3858b411b363SPhilipp Reisner * 3859b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 3860b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 3861b411b363SPhilipp Reisner */ 3862b411b363SPhilipp Reisner i = drbd_release_ee(mdev, &mdev->net_ee); 3863b411b363SPhilipp Reisner if (i) 3864b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 3865b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 3866b411b363SPhilipp Reisner if (i) 386745bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 3868b411b363SPhilipp Reisner 3869b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 3870b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 3871b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 3872b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 3873b411b363SPhilipp Reisner 3874b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 3875b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 3876b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 3877b411b363SPhilipp Reisner } 3878b411b363SPhilipp Reisner 3879b411b363SPhilipp Reisner /* 3880b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 3881b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 3882b411b363SPhilipp Reisner * 3883b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 3884b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 3885b411b363SPhilipp Reisner * 3886b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 3887b411b363SPhilipp Reisner */ 3888b411b363SPhilipp Reisner static int drbd_send_handshake(struct drbd_conf *mdev) 3889b411b363SPhilipp Reisner { 3890b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3891b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.sbuf.handshake; 3892b411b363SPhilipp Reisner int ok; 3893b411b363SPhilipp Reisner 3894b411b363SPhilipp Reisner if (mutex_lock_interruptible(&mdev->data.mutex)) { 3895b411b363SPhilipp Reisner dev_err(DEV, "interrupted during initial handshake\n"); 3896b411b363SPhilipp Reisner return 0; /* interrupted. not ok. */ 3897b411b363SPhilipp Reisner } 3898b411b363SPhilipp Reisner 3899b411b363SPhilipp Reisner if (mdev->data.socket == NULL) { 3900b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3901b411b363SPhilipp Reisner return 0; 3902b411b363SPhilipp Reisner } 3903b411b363SPhilipp Reisner 3904b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 3905b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 3906b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 3907b411b363SPhilipp Reisner ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE, 3908b411b363SPhilipp Reisner (struct p_header *)p, sizeof(*p), 0 ); 3909b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3910b411b363SPhilipp Reisner return ok; 3911b411b363SPhilipp Reisner } 3912b411b363SPhilipp Reisner 3913b411b363SPhilipp Reisner /* 3914b411b363SPhilipp Reisner * return values: 3915b411b363SPhilipp Reisner * 1 yes, we have a valid connection 3916b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 3917b411b363SPhilipp Reisner * -1 peer talks different language, 3918b411b363SPhilipp Reisner * no point in trying again, please go standalone. 3919b411b363SPhilipp Reisner */ 3920b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev) 3921b411b363SPhilipp Reisner { 3922b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3923b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.rbuf.handshake; 3924b411b363SPhilipp Reisner const int expect = sizeof(struct p_handshake) 3925b411b363SPhilipp Reisner -sizeof(struct p_header); 3926b411b363SPhilipp Reisner int rv; 3927b411b363SPhilipp Reisner 3928b411b363SPhilipp Reisner rv = drbd_send_handshake(mdev); 3929b411b363SPhilipp Reisner if (!rv) 3930b411b363SPhilipp Reisner return 0; 3931b411b363SPhilipp Reisner 3932b411b363SPhilipp Reisner rv = drbd_recv_header(mdev, &p->head); 3933b411b363SPhilipp Reisner if (!rv) 3934b411b363SPhilipp Reisner return 0; 3935b411b363SPhilipp Reisner 3936b411b363SPhilipp Reisner if (p->head.command != P_HAND_SHAKE) { 3937b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", 3938b411b363SPhilipp Reisner cmdname(p->head.command), p->head.command); 3939b411b363SPhilipp Reisner return -1; 3940b411b363SPhilipp Reisner } 3941b411b363SPhilipp Reisner 3942b411b363SPhilipp Reisner if (p->head.length != expect) { 3943b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake length: %u, received: %u\n", 3944b411b363SPhilipp Reisner expect, p->head.length); 3945b411b363SPhilipp Reisner return -1; 3946b411b363SPhilipp Reisner } 3947b411b363SPhilipp Reisner 3948b411b363SPhilipp Reisner rv = drbd_recv(mdev, &p->head.payload, expect); 3949b411b363SPhilipp Reisner 3950b411b363SPhilipp Reisner if (rv != expect) { 3951b411b363SPhilipp Reisner dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv); 3952b411b363SPhilipp Reisner return 0; 3953b411b363SPhilipp Reisner } 3954b411b363SPhilipp Reisner 3955b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 3956b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 3957b411b363SPhilipp Reisner if (p->protocol_max == 0) 3958b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 3959b411b363SPhilipp Reisner 3960b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 3961b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 3962b411b363SPhilipp Reisner goto incompat; 3963b411b363SPhilipp Reisner 3964b411b363SPhilipp Reisner mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 3965b411b363SPhilipp Reisner 3966b411b363SPhilipp Reisner dev_info(DEV, "Handshake successful: " 3967b411b363SPhilipp Reisner "Agreed network protocol version %d\n", mdev->agreed_pro_version); 3968b411b363SPhilipp Reisner 3969b411b363SPhilipp Reisner return 1; 3970b411b363SPhilipp Reisner 3971b411b363SPhilipp Reisner incompat: 3972b411b363SPhilipp Reisner dev_err(DEV, "incompatible DRBD dialects: " 3973b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 3974b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 3975b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 3976b411b363SPhilipp Reisner return -1; 3977b411b363SPhilipp Reisner } 3978b411b363SPhilipp Reisner 3979b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 3980b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 3981b411b363SPhilipp Reisner { 3982b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 3983b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 3984b10d96cbSJohannes Thoma return -1; 3985b411b363SPhilipp Reisner } 3986b411b363SPhilipp Reisner #else 3987b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 3988b10d96cbSJohannes Thoma 3989b10d96cbSJohannes Thoma /* Return value: 3990b10d96cbSJohannes Thoma 1 - auth succeeded, 3991b10d96cbSJohannes Thoma 0 - failed, try again (network error), 3992b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 3993b10d96cbSJohannes Thoma */ 3994b10d96cbSJohannes Thoma 3995b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 3996b411b363SPhilipp Reisner { 3997b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 3998b411b363SPhilipp Reisner struct scatterlist sg; 3999b411b363SPhilipp Reisner char *response = NULL; 4000b411b363SPhilipp Reisner char *right_response = NULL; 4001b411b363SPhilipp Reisner char *peers_ch = NULL; 4002b411b363SPhilipp Reisner struct p_header p; 4003b411b363SPhilipp Reisner unsigned int key_len = strlen(mdev->net_conf->shared_secret); 4004b411b363SPhilipp Reisner unsigned int resp_size; 4005b411b363SPhilipp Reisner struct hash_desc desc; 4006b411b363SPhilipp Reisner int rv; 4007b411b363SPhilipp Reisner 4008b411b363SPhilipp Reisner desc.tfm = mdev->cram_hmac_tfm; 4009b411b363SPhilipp Reisner desc.flags = 0; 4010b411b363SPhilipp Reisner 4011b411b363SPhilipp Reisner rv = crypto_hash_setkey(mdev->cram_hmac_tfm, 4012b411b363SPhilipp Reisner (u8 *)mdev->net_conf->shared_secret, key_len); 4013b411b363SPhilipp Reisner if (rv) { 4014b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); 4015b10d96cbSJohannes Thoma rv = -1; 4016b411b363SPhilipp Reisner goto fail; 4017b411b363SPhilipp Reisner } 4018b411b363SPhilipp Reisner 4019b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4020b411b363SPhilipp Reisner 4021b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); 4022b411b363SPhilipp Reisner if (!rv) 4023b411b363SPhilipp Reisner goto fail; 4024b411b363SPhilipp Reisner 4025b411b363SPhilipp Reisner rv = drbd_recv_header(mdev, &p); 4026b411b363SPhilipp Reisner if (!rv) 4027b411b363SPhilipp Reisner goto fail; 4028b411b363SPhilipp Reisner 4029b411b363SPhilipp Reisner if (p.command != P_AUTH_CHALLENGE) { 4030b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", 4031b411b363SPhilipp Reisner cmdname(p.command), p.command); 4032b411b363SPhilipp Reisner rv = 0; 4033b411b363SPhilipp Reisner goto fail; 4034b411b363SPhilipp Reisner } 4035b411b363SPhilipp Reisner 4036b411b363SPhilipp Reisner if (p.length > CHALLENGE_LEN*2) { 4037b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge payload too big.\n"); 4038b10d96cbSJohannes Thoma rv = -1; 4039b411b363SPhilipp Reisner goto fail; 4040b411b363SPhilipp Reisner } 4041b411b363SPhilipp Reisner 4042b411b363SPhilipp Reisner peers_ch = kmalloc(p.length, GFP_NOIO); 4043b411b363SPhilipp Reisner if (peers_ch == NULL) { 4044b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of peers_ch failed\n"); 4045b10d96cbSJohannes Thoma rv = -1; 4046b411b363SPhilipp Reisner goto fail; 4047b411b363SPhilipp Reisner } 4048b411b363SPhilipp Reisner 4049b411b363SPhilipp Reisner rv = drbd_recv(mdev, peers_ch, p.length); 4050b411b363SPhilipp Reisner 4051b411b363SPhilipp Reisner if (rv != p.length) { 4052b411b363SPhilipp Reisner dev_err(DEV, "short read AuthChallenge: l=%u\n", rv); 4053b411b363SPhilipp Reisner rv = 0; 4054b411b363SPhilipp Reisner goto fail; 4055b411b363SPhilipp Reisner } 4056b411b363SPhilipp Reisner 4057b411b363SPhilipp Reisner resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm); 4058b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4059b411b363SPhilipp Reisner if (response == NULL) { 4060b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of response failed\n"); 4061b10d96cbSJohannes Thoma rv = -1; 4062b411b363SPhilipp Reisner goto fail; 4063b411b363SPhilipp Reisner } 4064b411b363SPhilipp Reisner 4065b411b363SPhilipp Reisner sg_init_table(&sg, 1); 4066b411b363SPhilipp Reisner sg_set_buf(&sg, peers_ch, p.length); 4067b411b363SPhilipp Reisner 4068b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4069b411b363SPhilipp Reisner if (rv) { 4070b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4071b10d96cbSJohannes Thoma rv = -1; 4072b411b363SPhilipp Reisner goto fail; 4073b411b363SPhilipp Reisner } 4074b411b363SPhilipp Reisner 4075b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); 4076b411b363SPhilipp Reisner if (!rv) 4077b411b363SPhilipp Reisner goto fail; 4078b411b363SPhilipp Reisner 4079b411b363SPhilipp Reisner rv = drbd_recv_header(mdev, &p); 4080b411b363SPhilipp Reisner if (!rv) 4081b411b363SPhilipp Reisner goto fail; 4082b411b363SPhilipp Reisner 4083b411b363SPhilipp Reisner if (p.command != P_AUTH_RESPONSE) { 4084b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", 4085b411b363SPhilipp Reisner cmdname(p.command), p.command); 4086b411b363SPhilipp Reisner rv = 0; 4087b411b363SPhilipp Reisner goto fail; 4088b411b363SPhilipp Reisner } 4089b411b363SPhilipp Reisner 4090b411b363SPhilipp Reisner if (p.length != resp_size) { 4091b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse payload of wrong size\n"); 4092b411b363SPhilipp Reisner rv = 0; 4093b411b363SPhilipp Reisner goto fail; 4094b411b363SPhilipp Reisner } 4095b411b363SPhilipp Reisner 4096b411b363SPhilipp Reisner rv = drbd_recv(mdev, response , resp_size); 4097b411b363SPhilipp Reisner 4098b411b363SPhilipp Reisner if (rv != resp_size) { 4099b411b363SPhilipp Reisner dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv); 4100b411b363SPhilipp Reisner rv = 0; 4101b411b363SPhilipp Reisner goto fail; 4102b411b363SPhilipp Reisner } 4103b411b363SPhilipp Reisner 4104b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 41052d1ee87dSJulia Lawall if (right_response == NULL) { 4106b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of right_response failed\n"); 4107b10d96cbSJohannes Thoma rv = -1; 4108b411b363SPhilipp Reisner goto fail; 4109b411b363SPhilipp Reisner } 4110b411b363SPhilipp Reisner 4111b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4112b411b363SPhilipp Reisner 4113b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4114b411b363SPhilipp Reisner if (rv) { 4115b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4116b10d96cbSJohannes Thoma rv = -1; 4117b411b363SPhilipp Reisner goto fail; 4118b411b363SPhilipp Reisner } 4119b411b363SPhilipp Reisner 4120b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4121b411b363SPhilipp Reisner 4122b411b363SPhilipp Reisner if (rv) 4123b411b363SPhilipp Reisner dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", 4124b411b363SPhilipp Reisner resp_size, mdev->net_conf->cram_hmac_alg); 4125b10d96cbSJohannes Thoma else 4126b10d96cbSJohannes Thoma rv = -1; 4127b411b363SPhilipp Reisner 4128b411b363SPhilipp Reisner fail: 4129b411b363SPhilipp Reisner kfree(peers_ch); 4130b411b363SPhilipp Reisner kfree(response); 4131b411b363SPhilipp Reisner kfree(right_response); 4132b411b363SPhilipp Reisner 4133b411b363SPhilipp Reisner return rv; 4134b411b363SPhilipp Reisner } 4135b411b363SPhilipp Reisner #endif 4136b411b363SPhilipp Reisner 4137b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4138b411b363SPhilipp Reisner { 4139b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 4140b411b363SPhilipp Reisner unsigned int minor = mdev_to_minor(mdev); 4141b411b363SPhilipp Reisner int h; 4142b411b363SPhilipp Reisner 4143b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_receiver", minor); 4144b411b363SPhilipp Reisner 4145b411b363SPhilipp Reisner dev_info(DEV, "receiver (re)started\n"); 4146b411b363SPhilipp Reisner 4147b411b363SPhilipp Reisner do { 4148b411b363SPhilipp Reisner h = drbd_connect(mdev); 4149b411b363SPhilipp Reisner if (h == 0) { 4150b411b363SPhilipp Reisner drbd_disconnect(mdev); 4151b411b363SPhilipp Reisner __set_current_state(TASK_INTERRUPTIBLE); 4152b411b363SPhilipp Reisner schedule_timeout(HZ); 4153b411b363SPhilipp Reisner } 4154b411b363SPhilipp Reisner if (h == -1) { 4155b411b363SPhilipp Reisner dev_warn(DEV, "Discarding network configuration.\n"); 4156b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4157b411b363SPhilipp Reisner } 4158b411b363SPhilipp Reisner } while (h == 0); 4159b411b363SPhilipp Reisner 4160b411b363SPhilipp Reisner if (h > 0) { 4161b411b363SPhilipp Reisner if (get_net_conf(mdev)) { 4162b411b363SPhilipp Reisner drbdd(mdev); 4163b411b363SPhilipp Reisner put_net_conf(mdev); 4164b411b363SPhilipp Reisner } 4165b411b363SPhilipp Reisner } 4166b411b363SPhilipp Reisner 4167b411b363SPhilipp Reisner drbd_disconnect(mdev); 4168b411b363SPhilipp Reisner 4169b411b363SPhilipp Reisner dev_info(DEV, "receiver terminated\n"); 4170b411b363SPhilipp Reisner return 0; 4171b411b363SPhilipp Reisner } 4172b411b363SPhilipp Reisner 4173b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4174b411b363SPhilipp Reisner 4175b411b363SPhilipp Reisner static int got_RqSReply(struct drbd_conf *mdev, struct p_header *h) 4176b411b363SPhilipp Reisner { 4177b411b363SPhilipp Reisner struct p_req_state_reply *p = (struct p_req_state_reply *)h; 4178b411b363SPhilipp Reisner 4179b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4180b411b363SPhilipp Reisner 4181b411b363SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4182b411b363SPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4183b411b363SPhilipp Reisner } else { 4184b411b363SPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4185b411b363SPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4186b411b363SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4187b411b363SPhilipp Reisner } 4188b411b363SPhilipp Reisner wake_up(&mdev->state_wait); 4189b411b363SPhilipp Reisner 4190b411b363SPhilipp Reisner return TRUE; 4191b411b363SPhilipp Reisner } 4192b411b363SPhilipp Reisner 4193b411b363SPhilipp Reisner static int got_Ping(struct drbd_conf *mdev, struct p_header *h) 4194b411b363SPhilipp Reisner { 4195b411b363SPhilipp Reisner return drbd_send_ping_ack(mdev); 4196b411b363SPhilipp Reisner 4197b411b363SPhilipp Reisner } 4198b411b363SPhilipp Reisner 4199b411b363SPhilipp Reisner static int got_PingAck(struct drbd_conf *mdev, struct p_header *h) 4200b411b363SPhilipp Reisner { 4201b411b363SPhilipp Reisner /* restore idle timeout */ 4202b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 4203309d1608SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags)) 4204309d1608SPhilipp Reisner wake_up(&mdev->misc_wait); 4205b411b363SPhilipp Reisner 4206b411b363SPhilipp Reisner return TRUE; 4207b411b363SPhilipp Reisner } 4208b411b363SPhilipp Reisner 4209b411b363SPhilipp Reisner static int got_IsInSync(struct drbd_conf *mdev, struct p_header *h) 4210b411b363SPhilipp Reisner { 4211b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4212b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4213b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4214b411b363SPhilipp Reisner 4215b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 4216b411b363SPhilipp Reisner 4217b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4218b411b363SPhilipp Reisner 4219b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4220b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4221b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4222b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 4223b411b363SPhilipp Reisner dec_rs_pending(mdev); 4224778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4225b411b363SPhilipp Reisner 4226b411b363SPhilipp Reisner return TRUE; 4227b411b363SPhilipp Reisner } 4228b411b363SPhilipp Reisner 4229b411b363SPhilipp Reisner /* when we receive the ACK for a write request, 4230b411b363SPhilipp Reisner * verify that we actually know about it */ 4231b411b363SPhilipp Reisner static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev, 4232b411b363SPhilipp Reisner u64 id, sector_t sector) 4233b411b363SPhilipp Reisner { 4234b411b363SPhilipp Reisner struct hlist_head *slot = tl_hash_slot(mdev, sector); 4235b411b363SPhilipp Reisner struct hlist_node *n; 4236b411b363SPhilipp Reisner struct drbd_request *req; 4237b411b363SPhilipp Reisner 4238b411b363SPhilipp Reisner hlist_for_each_entry(req, n, slot, colision) { 4239b411b363SPhilipp Reisner if ((unsigned long)req == (unsigned long)id) { 4240b411b363SPhilipp Reisner if (req->sector != sector) { 4241b411b363SPhilipp Reisner dev_err(DEV, "_ack_id_to_req: found req %p but it has " 4242b411b363SPhilipp Reisner "wrong sector (%llus versus %llus)\n", req, 4243b411b363SPhilipp Reisner (unsigned long long)req->sector, 4244b411b363SPhilipp Reisner (unsigned long long)sector); 4245b411b363SPhilipp Reisner break; 4246b411b363SPhilipp Reisner } 4247b411b363SPhilipp Reisner return req; 4248b411b363SPhilipp Reisner } 4249b411b363SPhilipp Reisner } 4250b411b363SPhilipp Reisner dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n", 4251b411b363SPhilipp Reisner (void *)(unsigned long)id, (unsigned long long)sector); 4252b411b363SPhilipp Reisner return NULL; 4253b411b363SPhilipp Reisner } 4254b411b363SPhilipp Reisner 4255b411b363SPhilipp Reisner typedef struct drbd_request *(req_validator_fn) 4256b411b363SPhilipp Reisner (struct drbd_conf *mdev, u64 id, sector_t sector); 4257b411b363SPhilipp Reisner 4258b411b363SPhilipp Reisner static int validate_req_change_req_state(struct drbd_conf *mdev, 4259b411b363SPhilipp Reisner u64 id, sector_t sector, req_validator_fn validator, 4260b411b363SPhilipp Reisner const char *func, enum drbd_req_event what) 4261b411b363SPhilipp Reisner { 4262b411b363SPhilipp Reisner struct drbd_request *req; 4263b411b363SPhilipp Reisner struct bio_and_error m; 4264b411b363SPhilipp Reisner 4265b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4266b411b363SPhilipp Reisner req = validator(mdev, id, sector); 4267b411b363SPhilipp Reisner if (unlikely(!req)) { 4268b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4269b411b363SPhilipp Reisner dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func); 4270b411b363SPhilipp Reisner return FALSE; 4271b411b363SPhilipp Reisner } 4272b411b363SPhilipp Reisner __req_mod(req, what, &m); 4273b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4274b411b363SPhilipp Reisner 4275b411b363SPhilipp Reisner if (m.bio) 4276b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 4277b411b363SPhilipp Reisner return TRUE; 4278b411b363SPhilipp Reisner } 4279b411b363SPhilipp Reisner 4280b411b363SPhilipp Reisner static int got_BlockAck(struct drbd_conf *mdev, struct p_header *h) 4281b411b363SPhilipp Reisner { 4282b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4283b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4284b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4285b411b363SPhilipp Reisner enum drbd_req_event what; 4286b411b363SPhilipp Reisner 4287b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4288b411b363SPhilipp Reisner 4289b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4290b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4291b411b363SPhilipp Reisner dec_rs_pending(mdev); 4292b411b363SPhilipp Reisner return TRUE; 4293b411b363SPhilipp Reisner } 4294b411b363SPhilipp Reisner switch (be16_to_cpu(h->command)) { 4295b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 4296b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4297b411b363SPhilipp Reisner what = write_acked_by_peer_and_sis; 4298b411b363SPhilipp Reisner break; 4299b411b363SPhilipp Reisner case P_WRITE_ACK: 4300b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4301b411b363SPhilipp Reisner what = write_acked_by_peer; 4302b411b363SPhilipp Reisner break; 4303b411b363SPhilipp Reisner case P_RECV_ACK: 4304b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B); 4305b411b363SPhilipp Reisner what = recv_acked_by_peer; 4306b411b363SPhilipp Reisner break; 4307b411b363SPhilipp Reisner case P_DISCARD_ACK: 4308b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4309b411b363SPhilipp Reisner what = conflict_discarded_by_peer; 4310b411b363SPhilipp Reisner break; 4311b411b363SPhilipp Reisner default: 4312b411b363SPhilipp Reisner D_ASSERT(0); 4313b411b363SPhilipp Reisner return FALSE; 4314b411b363SPhilipp Reisner } 4315b411b363SPhilipp Reisner 4316b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4317b411b363SPhilipp Reisner _ack_id_to_req, __func__ , what); 4318b411b363SPhilipp Reisner } 4319b411b363SPhilipp Reisner 4320b411b363SPhilipp Reisner static int got_NegAck(struct drbd_conf *mdev, struct p_header *h) 4321b411b363SPhilipp Reisner { 4322b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4323b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4324b411b363SPhilipp Reisner 4325b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 4326b411b363SPhilipp Reisner dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n"); 4327b411b363SPhilipp Reisner 4328b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4329b411b363SPhilipp Reisner 4330b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4331b411b363SPhilipp Reisner int size = be32_to_cpu(p->blksize); 4332b411b363SPhilipp Reisner dec_rs_pending(mdev); 4333b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4334b411b363SPhilipp Reisner return TRUE; 4335b411b363SPhilipp Reisner } 4336b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4337b411b363SPhilipp Reisner _ack_id_to_req, __func__ , neg_acked); 4338b411b363SPhilipp Reisner } 4339b411b363SPhilipp Reisner 4340b411b363SPhilipp Reisner static int got_NegDReply(struct drbd_conf *mdev, struct p_header *h) 4341b411b363SPhilipp Reisner { 4342b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4343b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4344b411b363SPhilipp Reisner 4345b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4346b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4347b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4348b411b363SPhilipp Reisner 4349b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4350b411b363SPhilipp Reisner _ar_id_to_req, __func__ , neg_acked); 4351b411b363SPhilipp Reisner } 4352b411b363SPhilipp Reisner 4353b411b363SPhilipp Reisner static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header *h) 4354b411b363SPhilipp Reisner { 4355b411b363SPhilipp Reisner sector_t sector; 4356b411b363SPhilipp Reisner int size; 4357b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4358b411b363SPhilipp Reisner 4359b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4360b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4361b411b363SPhilipp Reisner 4362b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4363b411b363SPhilipp Reisner 4364b411b363SPhilipp Reisner dec_rs_pending(mdev); 4365b411b363SPhilipp Reisner 4366b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4367b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4368b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4369b411b363SPhilipp Reisner put_ldev(mdev); 4370b411b363SPhilipp Reisner } 4371b411b363SPhilipp Reisner 4372b411b363SPhilipp Reisner return TRUE; 4373b411b363SPhilipp Reisner } 4374b411b363SPhilipp Reisner 4375b411b363SPhilipp Reisner static int got_BarrierAck(struct drbd_conf *mdev, struct p_header *h) 4376b411b363SPhilipp Reisner { 4377b411b363SPhilipp Reisner struct p_barrier_ack *p = (struct p_barrier_ack *)h; 4378b411b363SPhilipp Reisner 4379b411b363SPhilipp Reisner tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); 4380b411b363SPhilipp Reisner 4381b411b363SPhilipp Reisner return TRUE; 4382b411b363SPhilipp Reisner } 4383b411b363SPhilipp Reisner 4384b411b363SPhilipp Reisner static int got_OVResult(struct drbd_conf *mdev, struct p_header *h) 4385b411b363SPhilipp Reisner { 4386b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4387b411b363SPhilipp Reisner struct drbd_work *w; 4388b411b363SPhilipp Reisner sector_t sector; 4389b411b363SPhilipp Reisner int size; 4390b411b363SPhilipp Reisner 4391b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4392b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4393b411b363SPhilipp Reisner 4394b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4395b411b363SPhilipp Reisner 4396b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 4397b411b363SPhilipp Reisner drbd_ov_oos_found(mdev, sector, size); 4398b411b363SPhilipp Reisner else 4399b411b363SPhilipp Reisner ov_oos_print(mdev); 4400b411b363SPhilipp Reisner 4401b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4402b411b363SPhilipp Reisner dec_rs_pending(mdev); 4403b411b363SPhilipp Reisner 4404b411b363SPhilipp Reisner if (--mdev->ov_left == 0) { 4405b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4406b411b363SPhilipp Reisner if (w) { 4407b411b363SPhilipp Reisner w->cb = w_ov_finished; 4408b411b363SPhilipp Reisner drbd_queue_work_front(&mdev->data.work, w); 4409b411b363SPhilipp Reisner } else { 4410b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 4411b411b363SPhilipp Reisner ov_oos_print(mdev); 4412b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4413b411b363SPhilipp Reisner } 4414b411b363SPhilipp Reisner } 4415b411b363SPhilipp Reisner return TRUE; 4416b411b363SPhilipp Reisner } 4417b411b363SPhilipp Reisner 4418e7f52dfbSLars Ellenberg static int got_something_to_ignore_m(struct drbd_conf *mdev, struct p_header *h) 44190ced55a3SPhilipp Reisner { 4420e7f52dfbSLars Ellenberg /* IGNORE */ 44210ced55a3SPhilipp Reisner return TRUE; 44220ced55a3SPhilipp Reisner } 44230ced55a3SPhilipp Reisner 4424b411b363SPhilipp Reisner struct asender_cmd { 4425b411b363SPhilipp Reisner size_t pkt_size; 4426b411b363SPhilipp Reisner int (*process)(struct drbd_conf *mdev, struct p_header *h); 4427b411b363SPhilipp Reisner }; 4428b411b363SPhilipp Reisner 4429b411b363SPhilipp Reisner static struct asender_cmd *get_asender_cmd(int cmd) 4430b411b363SPhilipp Reisner { 4431b411b363SPhilipp Reisner static struct asender_cmd asender_tbl[] = { 4432b411b363SPhilipp Reisner /* anything missing from this table is in 4433b411b363SPhilipp Reisner * the drbd_cmd_handler (drbd_default_handler) table, 4434b411b363SPhilipp Reisner * see the beginning of drbdd() */ 4435b411b363SPhilipp Reisner [P_PING] = { sizeof(struct p_header), got_Ping }, 4436b411b363SPhilipp Reisner [P_PING_ACK] = { sizeof(struct p_header), got_PingAck }, 4437b411b363SPhilipp Reisner [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4438b411b363SPhilipp Reisner [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4439b411b363SPhilipp Reisner [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4440b411b363SPhilipp Reisner [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4441b411b363SPhilipp Reisner [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 4442b411b363SPhilipp Reisner [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 4443b411b363SPhilipp Reisner [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4444b411b363SPhilipp Reisner [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 4445b411b363SPhilipp Reisner [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 4446b411b363SPhilipp Reisner [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 4447b411b363SPhilipp Reisner [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 4448e7f52dfbSLars Ellenberg [P_DELAY_PROBE] = { sizeof(struct p_delay_probe), got_something_to_ignore_m }, 4449b411b363SPhilipp Reisner [P_MAX_CMD] = { 0, NULL }, 4450b411b363SPhilipp Reisner }; 4451b411b363SPhilipp Reisner if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) 4452b411b363SPhilipp Reisner return NULL; 4453b411b363SPhilipp Reisner return &asender_tbl[cmd]; 4454b411b363SPhilipp Reisner } 4455b411b363SPhilipp Reisner 4456b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4457b411b363SPhilipp Reisner { 4458b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 4459b411b363SPhilipp Reisner struct p_header *h = &mdev->meta.rbuf.header; 4460b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 4461b411b363SPhilipp Reisner 4462b411b363SPhilipp Reisner int rv, len; 4463b411b363SPhilipp Reisner void *buf = h; 4464b411b363SPhilipp Reisner int received = 0; 4465b411b363SPhilipp Reisner int expect = sizeof(struct p_header); 4466b411b363SPhilipp Reisner int empty; 4467b411b363SPhilipp Reisner 4468b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); 4469b411b363SPhilipp Reisner 4470b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 4471b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 4472b411b363SPhilipp Reisner 4473b411b363SPhilipp Reisner while (get_t_state(thi) == Running) { 4474b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 4475b411b363SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &mdev->flags)) { 4476b411b363SPhilipp Reisner ERR_IF(!drbd_send_ping(mdev)) goto reconnect; 4477b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = 4478b411b363SPhilipp Reisner mdev->net_conf->ping_timeo*HZ/10; 4479b411b363SPhilipp Reisner } 4480b411b363SPhilipp Reisner 4481b411b363SPhilipp Reisner /* conditionally cork; 4482b411b363SPhilipp Reisner * it may hurt latency if we cork without much to send */ 4483b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork && 4484b411b363SPhilipp Reisner 3 < atomic_read(&mdev->unacked_cnt)) 4485b411b363SPhilipp Reisner drbd_tcp_cork(mdev->meta.socket); 4486b411b363SPhilipp Reisner while (1) { 4487b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4488b411b363SPhilipp Reisner flush_signals(current); 4489b411b363SPhilipp Reisner if (!drbd_process_done_ee(mdev)) { 4490b411b363SPhilipp Reisner dev_err(DEV, "process_done_ee() = NOT_OK\n"); 4491b411b363SPhilipp Reisner goto reconnect; 4492b411b363SPhilipp Reisner } 4493b411b363SPhilipp Reisner /* to avoid race with newly queued ACKs */ 4494b411b363SPhilipp Reisner set_bit(SIGNAL_ASENDER, &mdev->flags); 4495b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4496b411b363SPhilipp Reisner empty = list_empty(&mdev->done_ee); 4497b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4498b411b363SPhilipp Reisner /* new ack may have been queued right here, 4499b411b363SPhilipp Reisner * but then there is also a signal pending, 4500b411b363SPhilipp Reisner * and we start over... */ 4501b411b363SPhilipp Reisner if (empty) 4502b411b363SPhilipp Reisner break; 4503b411b363SPhilipp Reisner } 4504b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 4505b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork) 4506b411b363SPhilipp Reisner drbd_tcp_uncork(mdev->meta.socket); 4507b411b363SPhilipp Reisner 4508b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 4509b411b363SPhilipp Reisner if (signal_pending(current)) 4510b411b363SPhilipp Reisner continue; 4511b411b363SPhilipp Reisner 4512b411b363SPhilipp Reisner rv = drbd_recv_short(mdev, mdev->meta.socket, 4513b411b363SPhilipp Reisner buf, expect-received, 0); 4514b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4515b411b363SPhilipp Reisner 4516b411b363SPhilipp Reisner flush_signals(current); 4517b411b363SPhilipp Reisner 4518b411b363SPhilipp Reisner /* Note: 4519b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 4520b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 4521b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 4522b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 4523b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 4524b411b363SPhilipp Reisner * rv == expected: full header or command 4525b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 4526b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 4527b411b363SPhilipp Reisner */ 4528b411b363SPhilipp Reisner if (likely(rv > 0)) { 4529b411b363SPhilipp Reisner received += rv; 4530b411b363SPhilipp Reisner buf += rv; 4531b411b363SPhilipp Reisner } else if (rv == 0) { 4532b411b363SPhilipp Reisner dev_err(DEV, "meta connection shut down by peer.\n"); 4533b411b363SPhilipp Reisner goto reconnect; 4534b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 4535b411b363SPhilipp Reisner if (mdev->meta.socket->sk->sk_rcvtimeo == 4536b411b363SPhilipp Reisner mdev->net_conf->ping_timeo*HZ/10) { 4537b411b363SPhilipp Reisner dev_err(DEV, "PingAck did not arrive in time.\n"); 4538b411b363SPhilipp Reisner goto reconnect; 4539b411b363SPhilipp Reisner } 4540b411b363SPhilipp Reisner set_bit(SEND_PING, &mdev->flags); 4541b411b363SPhilipp Reisner continue; 4542b411b363SPhilipp Reisner } else if (rv == -EINTR) { 4543b411b363SPhilipp Reisner continue; 4544b411b363SPhilipp Reisner } else { 4545b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 4546b411b363SPhilipp Reisner goto reconnect; 4547b411b363SPhilipp Reisner } 4548b411b363SPhilipp Reisner 4549b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 4550b411b363SPhilipp Reisner if (unlikely(h->magic != BE_DRBD_MAGIC)) { 4551b411b363SPhilipp Reisner dev_err(DEV, "magic?? on meta m: 0x%lx c: %d l: %d\n", 4552b411b363SPhilipp Reisner (long)be32_to_cpu(h->magic), 4553b411b363SPhilipp Reisner h->command, h->length); 4554b411b363SPhilipp Reisner goto reconnect; 4555b411b363SPhilipp Reisner } 4556b411b363SPhilipp Reisner cmd = get_asender_cmd(be16_to_cpu(h->command)); 4557b411b363SPhilipp Reisner len = be16_to_cpu(h->length); 4558b411b363SPhilipp Reisner if (unlikely(cmd == NULL)) { 4559b411b363SPhilipp Reisner dev_err(DEV, "unknown command?? on meta m: 0x%lx c: %d l: %d\n", 4560b411b363SPhilipp Reisner (long)be32_to_cpu(h->magic), 4561b411b363SPhilipp Reisner h->command, h->length); 4562b411b363SPhilipp Reisner goto disconnect; 4563b411b363SPhilipp Reisner } 4564b411b363SPhilipp Reisner expect = cmd->pkt_size; 45656a0afdf5SJens Axboe ERR_IF(len != expect-sizeof(struct p_header)) 4566b411b363SPhilipp Reisner goto reconnect; 4567b411b363SPhilipp Reisner } 4568b411b363SPhilipp Reisner if (received == expect) { 4569b411b363SPhilipp Reisner D_ASSERT(cmd != NULL); 4570b411b363SPhilipp Reisner if (!cmd->process(mdev, h)) 4571b411b363SPhilipp Reisner goto reconnect; 4572b411b363SPhilipp Reisner 4573b411b363SPhilipp Reisner buf = h; 4574b411b363SPhilipp Reisner received = 0; 4575b411b363SPhilipp Reisner expect = sizeof(struct p_header); 4576b411b363SPhilipp Reisner cmd = NULL; 4577b411b363SPhilipp Reisner } 4578b411b363SPhilipp Reisner } 4579b411b363SPhilipp Reisner 4580b411b363SPhilipp Reisner if (0) { 4581b411b363SPhilipp Reisner reconnect: 4582b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); 4583b411b363SPhilipp Reisner } 4584b411b363SPhilipp Reisner if (0) { 4585b411b363SPhilipp Reisner disconnect: 4586b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4587b411b363SPhilipp Reisner } 4588b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4589b411b363SPhilipp Reisner 4590b411b363SPhilipp Reisner D_ASSERT(mdev->state.conn < C_CONNECTED); 4591b411b363SPhilipp Reisner dev_info(DEV, "asender terminated\n"); 4592b411b363SPhilipp Reisner 4593b411b363SPhilipp Reisner return 0; 4594b411b363SPhilipp Reisner } 4595