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/version.h> 32b411b363SPhilipp Reisner #include <linux/drbd.h> 33b411b363SPhilipp Reisner #include <linux/fs.h> 34b411b363SPhilipp Reisner #include <linux/file.h> 35b411b363SPhilipp Reisner #include <linux/in.h> 36b411b363SPhilipp Reisner #include <linux/mm.h> 37b411b363SPhilipp Reisner #include <linux/memcontrol.h> 38b411b363SPhilipp Reisner #include <linux/mm_inline.h> 39b411b363SPhilipp Reisner #include <linux/slab.h> 40b411b363SPhilipp Reisner #include <linux/smp_lock.h> 41b411b363SPhilipp Reisner #include <linux/pkt_sched.h> 42b411b363SPhilipp Reisner #define __KERNEL_SYSCALLS__ 43b411b363SPhilipp Reisner #include <linux/unistd.h> 44b411b363SPhilipp Reisner #include <linux/vmalloc.h> 45b411b363SPhilipp Reisner #include <linux/random.h> 46b411b363SPhilipp Reisner #include <linux/mm.h> 47b411b363SPhilipp Reisner #include <linux/string.h> 48b411b363SPhilipp Reisner #include <linux/scatterlist.h> 49b411b363SPhilipp Reisner #include "drbd_int.h" 50b411b363SPhilipp Reisner #include "drbd_req.h" 51b411b363SPhilipp Reisner 52b411b363SPhilipp Reisner #include "drbd_vli.h" 53b411b363SPhilipp Reisner 54b411b363SPhilipp Reisner struct flush_work { 55b411b363SPhilipp Reisner struct drbd_work w; 56b411b363SPhilipp Reisner struct drbd_epoch *epoch; 57b411b363SPhilipp Reisner }; 58b411b363SPhilipp Reisner 59b411b363SPhilipp Reisner enum finish_epoch { 60b411b363SPhilipp Reisner FE_STILL_LIVE, 61b411b363SPhilipp Reisner FE_DESTROYED, 62b411b363SPhilipp Reisner FE_RECYCLED, 63b411b363SPhilipp Reisner }; 64b411b363SPhilipp Reisner 65b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev); 66b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev); 67b411b363SPhilipp Reisner 68b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); 69b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *, struct drbd_work *, int); 70b411b363SPhilipp Reisner 71b411b363SPhilipp Reisner static struct drbd_epoch *previous_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch) 72b411b363SPhilipp Reisner { 73b411b363SPhilipp Reisner struct drbd_epoch *prev; 74b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 75b411b363SPhilipp Reisner prev = list_entry(epoch->list.prev, struct drbd_epoch, list); 76b411b363SPhilipp Reisner if (prev == epoch || prev == mdev->current_epoch) 77b411b363SPhilipp Reisner prev = NULL; 78b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 79b411b363SPhilipp Reisner return prev; 80b411b363SPhilipp Reisner } 81b411b363SPhilipp Reisner 82b411b363SPhilipp Reisner #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) 83b411b363SPhilipp Reisner 84b411b363SPhilipp Reisner static struct page *drbd_pp_first_page_or_try_alloc(struct drbd_conf *mdev) 85b411b363SPhilipp Reisner { 86b411b363SPhilipp Reisner struct page *page = NULL; 87b411b363SPhilipp Reisner 88b411b363SPhilipp Reisner /* Yes, testing drbd_pp_vacant outside the lock is racy. 89b411b363SPhilipp Reisner * So what. It saves a spin_lock. */ 90b411b363SPhilipp Reisner if (drbd_pp_vacant > 0) { 91b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 92b411b363SPhilipp Reisner page = drbd_pp_pool; 93b411b363SPhilipp Reisner if (page) { 94b411b363SPhilipp Reisner drbd_pp_pool = (struct page *)page_private(page); 95b411b363SPhilipp Reisner set_page_private(page, 0); /* just to be polite */ 96b411b363SPhilipp Reisner drbd_pp_vacant--; 97b411b363SPhilipp Reisner } 98b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 99b411b363SPhilipp Reisner } 100b411b363SPhilipp Reisner /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD 101b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 102b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 103b411b363SPhilipp Reisner if (!page) 104b411b363SPhilipp Reisner page = alloc_page(GFP_TRY); 105b411b363SPhilipp Reisner if (page) 106b411b363SPhilipp Reisner atomic_inc(&mdev->pp_in_use); 107b411b363SPhilipp Reisner return page; 108b411b363SPhilipp Reisner } 109b411b363SPhilipp Reisner 110b411b363SPhilipp Reisner /* kick lower level device, if we have more than (arbitrary number) 111b411b363SPhilipp Reisner * reference counts on it, which typically are locally submitted io 112b411b363SPhilipp Reisner * requests. don't use unacked_cnt, so we speed up proto A and B, too. */ 113b411b363SPhilipp Reisner static void maybe_kick_lo(struct drbd_conf *mdev) 114b411b363SPhilipp Reisner { 115b411b363SPhilipp Reisner if (atomic_read(&mdev->local_cnt) >= mdev->net_conf->unplug_watermark) 116b411b363SPhilipp Reisner drbd_kick_lo(mdev); 117b411b363SPhilipp Reisner } 118b411b363SPhilipp Reisner 119b411b363SPhilipp Reisner static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed) 120b411b363SPhilipp Reisner { 121b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 122b411b363SPhilipp Reisner struct list_head *le, *tle; 123b411b363SPhilipp Reisner 124b411b363SPhilipp Reisner /* The EEs are always appended to the end of the list. Since 125b411b363SPhilipp Reisner they are sent in order over the wire, they have to finish 126b411b363SPhilipp Reisner in order. As soon as we see the first not finished we can 127b411b363SPhilipp Reisner stop to examine the list... */ 128b411b363SPhilipp Reisner 129b411b363SPhilipp Reisner list_for_each_safe(le, tle, &mdev->net_ee) { 130b411b363SPhilipp Reisner e = list_entry(le, struct drbd_epoch_entry, w.list); 131b411b363SPhilipp Reisner if (drbd_bio_has_active_page(e->private_bio)) 132b411b363SPhilipp Reisner break; 133b411b363SPhilipp Reisner list_move(le, to_be_freed); 134b411b363SPhilipp Reisner } 135b411b363SPhilipp Reisner } 136b411b363SPhilipp Reisner 137b411b363SPhilipp Reisner static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) 138b411b363SPhilipp Reisner { 139b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 140b411b363SPhilipp Reisner struct drbd_epoch_entry *e, *t; 141b411b363SPhilipp Reisner 142b411b363SPhilipp Reisner maybe_kick_lo(mdev); 143b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 144b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 145b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 146b411b363SPhilipp Reisner 147b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &reclaimed, w.list) 148b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 149b411b363SPhilipp Reisner } 150b411b363SPhilipp Reisner 151b411b363SPhilipp Reisner /** 152b411b363SPhilipp Reisner * drbd_pp_alloc() - Returns a page, fails only if a signal comes in 153b411b363SPhilipp Reisner * @mdev: DRBD device. 154b411b363SPhilipp Reisner * @retry: whether or not to retry allocation forever (or until signalled) 155b411b363SPhilipp Reisner * 156b411b363SPhilipp Reisner * Tries to allocate a page, first from our own page pool, then from the 157b411b363SPhilipp Reisner * kernel, unless this allocation would exceed the max_buffers setting. 158b411b363SPhilipp Reisner * If @retry is non-zero, retry until DRBD frees a page somewhere else. 159b411b363SPhilipp Reisner */ 160b411b363SPhilipp Reisner static struct page *drbd_pp_alloc(struct drbd_conf *mdev, int retry) 161b411b363SPhilipp Reisner { 162b411b363SPhilipp Reisner struct page *page = NULL; 163b411b363SPhilipp Reisner DEFINE_WAIT(wait); 164b411b363SPhilipp Reisner 165b411b363SPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) { 166b411b363SPhilipp Reisner page = drbd_pp_first_page_or_try_alloc(mdev); 167b411b363SPhilipp Reisner if (page) 168b411b363SPhilipp Reisner return page; 169b411b363SPhilipp Reisner } 170b411b363SPhilipp Reisner 171b411b363SPhilipp Reisner for (;;) { 172b411b363SPhilipp Reisner prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); 173b411b363SPhilipp Reisner 174b411b363SPhilipp Reisner drbd_kick_lo_and_reclaim_net(mdev); 175b411b363SPhilipp Reisner 176b411b363SPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) { 177b411b363SPhilipp Reisner page = drbd_pp_first_page_or_try_alloc(mdev); 178b411b363SPhilipp Reisner if (page) 179b411b363SPhilipp Reisner break; 180b411b363SPhilipp Reisner } 181b411b363SPhilipp Reisner 182b411b363SPhilipp Reisner if (!retry) 183b411b363SPhilipp Reisner break; 184b411b363SPhilipp Reisner 185b411b363SPhilipp Reisner if (signal_pending(current)) { 186b411b363SPhilipp Reisner dev_warn(DEV, "drbd_pp_alloc interrupted!\n"); 187b411b363SPhilipp Reisner break; 188b411b363SPhilipp Reisner } 189b411b363SPhilipp Reisner 190b411b363SPhilipp Reisner schedule(); 191b411b363SPhilipp Reisner } 192b411b363SPhilipp Reisner finish_wait(&drbd_pp_wait, &wait); 193b411b363SPhilipp Reisner 194b411b363SPhilipp Reisner return page; 195b411b363SPhilipp Reisner } 196b411b363SPhilipp Reisner 197b411b363SPhilipp Reisner /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc. 198b411b363SPhilipp Reisner * Is also used from inside an other spin_lock_irq(&mdev->req_lock) */ 199b411b363SPhilipp Reisner static void drbd_pp_free(struct drbd_conf *mdev, struct page *page) 200b411b363SPhilipp Reisner { 201b411b363SPhilipp Reisner int free_it; 202b411b363SPhilipp Reisner 203b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 204b411b363SPhilipp Reisner if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count) { 205b411b363SPhilipp Reisner free_it = 1; 206b411b363SPhilipp Reisner } else { 207b411b363SPhilipp Reisner set_page_private(page, (unsigned long)drbd_pp_pool); 208b411b363SPhilipp Reisner drbd_pp_pool = page; 209b411b363SPhilipp Reisner drbd_pp_vacant++; 210b411b363SPhilipp Reisner free_it = 0; 211b411b363SPhilipp Reisner } 212b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 213b411b363SPhilipp Reisner 214b411b363SPhilipp Reisner atomic_dec(&mdev->pp_in_use); 215b411b363SPhilipp Reisner 216b411b363SPhilipp Reisner if (free_it) 217b411b363SPhilipp Reisner __free_page(page); 218b411b363SPhilipp Reisner 219b411b363SPhilipp Reisner wake_up(&drbd_pp_wait); 220b411b363SPhilipp Reisner } 221b411b363SPhilipp Reisner 222b411b363SPhilipp Reisner static void drbd_pp_free_bio_pages(struct drbd_conf *mdev, struct bio *bio) 223b411b363SPhilipp Reisner { 224b411b363SPhilipp Reisner struct page *p_to_be_freed = NULL; 225b411b363SPhilipp Reisner struct page *page; 226b411b363SPhilipp Reisner struct bio_vec *bvec; 227b411b363SPhilipp Reisner int i; 228b411b363SPhilipp Reisner 229b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 230b411b363SPhilipp Reisner __bio_for_each_segment(bvec, bio, i, 0) { 231b411b363SPhilipp Reisner if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count) { 232b411b363SPhilipp Reisner set_page_private(bvec->bv_page, (unsigned long)p_to_be_freed); 233b411b363SPhilipp Reisner p_to_be_freed = bvec->bv_page; 234b411b363SPhilipp Reisner } else { 235b411b363SPhilipp Reisner set_page_private(bvec->bv_page, (unsigned long)drbd_pp_pool); 236b411b363SPhilipp Reisner drbd_pp_pool = bvec->bv_page; 237b411b363SPhilipp Reisner drbd_pp_vacant++; 238b411b363SPhilipp Reisner } 239b411b363SPhilipp Reisner } 240b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 241b411b363SPhilipp Reisner atomic_sub(bio->bi_vcnt, &mdev->pp_in_use); 242b411b363SPhilipp Reisner 243b411b363SPhilipp Reisner while (p_to_be_freed) { 244b411b363SPhilipp Reisner page = p_to_be_freed; 245b411b363SPhilipp Reisner p_to_be_freed = (struct page *)page_private(page); 246b411b363SPhilipp Reisner set_page_private(page, 0); /* just to be polite */ 247b411b363SPhilipp Reisner put_page(page); 248b411b363SPhilipp Reisner } 249b411b363SPhilipp Reisner 250b411b363SPhilipp Reisner wake_up(&drbd_pp_wait); 251b411b363SPhilipp Reisner } 252b411b363SPhilipp Reisner 253b411b363SPhilipp Reisner /* 254b411b363SPhilipp Reisner You need to hold the req_lock: 255b411b363SPhilipp Reisner _drbd_wait_ee_list_empty() 256b411b363SPhilipp Reisner 257b411b363SPhilipp Reisner You must not have the req_lock: 258b411b363SPhilipp Reisner drbd_free_ee() 259b411b363SPhilipp Reisner drbd_alloc_ee() 260b411b363SPhilipp Reisner drbd_init_ee() 261b411b363SPhilipp Reisner drbd_release_ee() 262b411b363SPhilipp Reisner drbd_ee_fix_bhs() 263b411b363SPhilipp Reisner drbd_process_done_ee() 264b411b363SPhilipp Reisner drbd_clear_done_ee() 265b411b363SPhilipp Reisner drbd_wait_ee_list_empty() 266b411b363SPhilipp Reisner */ 267b411b363SPhilipp Reisner 268b411b363SPhilipp Reisner struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev, 269b411b363SPhilipp Reisner u64 id, 270b411b363SPhilipp Reisner sector_t sector, 271b411b363SPhilipp Reisner unsigned int data_size, 272b411b363SPhilipp Reisner gfp_t gfp_mask) __must_hold(local) 273b411b363SPhilipp Reisner { 274b411b363SPhilipp Reisner struct request_queue *q; 275b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 276b411b363SPhilipp Reisner struct page *page; 277b411b363SPhilipp Reisner struct bio *bio; 278b411b363SPhilipp Reisner unsigned int ds; 279b411b363SPhilipp Reisner 280b411b363SPhilipp Reisner if (FAULT_ACTIVE(mdev, DRBD_FAULT_AL_EE)) 281b411b363SPhilipp Reisner return NULL; 282b411b363SPhilipp Reisner 283b411b363SPhilipp Reisner e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); 284b411b363SPhilipp Reisner if (!e) { 285b411b363SPhilipp Reisner if (!(gfp_mask & __GFP_NOWARN)) 286b411b363SPhilipp Reisner dev_err(DEV, "alloc_ee: Allocation of an EE failed\n"); 287b411b363SPhilipp Reisner return NULL; 288b411b363SPhilipp Reisner } 289b411b363SPhilipp Reisner 290b411b363SPhilipp Reisner bio = bio_alloc(gfp_mask & ~__GFP_HIGHMEM, div_ceil(data_size, PAGE_SIZE)); 291b411b363SPhilipp Reisner if (!bio) { 292b411b363SPhilipp Reisner if (!(gfp_mask & __GFP_NOWARN)) 293b411b363SPhilipp Reisner dev_err(DEV, "alloc_ee: Allocation of a bio failed\n"); 294b411b363SPhilipp Reisner goto fail1; 295b411b363SPhilipp Reisner } 296b411b363SPhilipp Reisner 297b411b363SPhilipp Reisner bio->bi_bdev = mdev->ldev->backing_bdev; 298b411b363SPhilipp Reisner bio->bi_sector = sector; 299b411b363SPhilipp Reisner 300b411b363SPhilipp Reisner ds = data_size; 301b411b363SPhilipp Reisner while (ds) { 302b411b363SPhilipp Reisner page = drbd_pp_alloc(mdev, (gfp_mask & __GFP_WAIT)); 303b411b363SPhilipp Reisner if (!page) { 304b411b363SPhilipp Reisner if (!(gfp_mask & __GFP_NOWARN)) 305b411b363SPhilipp Reisner dev_err(DEV, "alloc_ee: Allocation of a page failed\n"); 306b411b363SPhilipp Reisner goto fail2; 307b411b363SPhilipp Reisner } 308b411b363SPhilipp Reisner if (!bio_add_page(bio, page, min_t(int, ds, PAGE_SIZE), 0)) { 309b411b363SPhilipp Reisner drbd_pp_free(mdev, page); 310b411b363SPhilipp Reisner dev_err(DEV, "alloc_ee: bio_add_page(s=%llu," 311b411b363SPhilipp Reisner "data_size=%u,ds=%u) failed\n", 312b411b363SPhilipp Reisner (unsigned long long)sector, data_size, ds); 313b411b363SPhilipp Reisner 314b411b363SPhilipp Reisner q = bdev_get_queue(bio->bi_bdev); 315b411b363SPhilipp Reisner if (q->merge_bvec_fn) { 316b411b363SPhilipp Reisner struct bvec_merge_data bvm = { 317b411b363SPhilipp Reisner .bi_bdev = bio->bi_bdev, 318b411b363SPhilipp Reisner .bi_sector = bio->bi_sector, 319b411b363SPhilipp Reisner .bi_size = bio->bi_size, 320b411b363SPhilipp Reisner .bi_rw = bio->bi_rw, 321b411b363SPhilipp Reisner }; 322b411b363SPhilipp Reisner int l = q->merge_bvec_fn(q, &bvm, 323b411b363SPhilipp Reisner &bio->bi_io_vec[bio->bi_vcnt]); 324b411b363SPhilipp Reisner dev_err(DEV, "merge_bvec_fn() = %d\n", l); 325b411b363SPhilipp Reisner } 326b411b363SPhilipp Reisner 327b411b363SPhilipp Reisner /* dump more of the bio. */ 328b411b363SPhilipp Reisner dev_err(DEV, "bio->bi_max_vecs = %d\n", bio->bi_max_vecs); 329b411b363SPhilipp Reisner dev_err(DEV, "bio->bi_vcnt = %d\n", bio->bi_vcnt); 330b411b363SPhilipp Reisner dev_err(DEV, "bio->bi_size = %d\n", bio->bi_size); 331b411b363SPhilipp Reisner dev_err(DEV, "bio->bi_phys_segments = %d\n", bio->bi_phys_segments); 332b411b363SPhilipp Reisner 333b411b363SPhilipp Reisner goto fail2; 334b411b363SPhilipp Reisner break; 335b411b363SPhilipp Reisner } 336b411b363SPhilipp Reisner ds -= min_t(int, ds, PAGE_SIZE); 337b411b363SPhilipp Reisner } 338b411b363SPhilipp Reisner 339b411b363SPhilipp Reisner D_ASSERT(data_size == bio->bi_size); 340b411b363SPhilipp Reisner 341b411b363SPhilipp Reisner bio->bi_private = e; 342b411b363SPhilipp Reisner e->mdev = mdev; 343b411b363SPhilipp Reisner e->sector = sector; 344b411b363SPhilipp Reisner e->size = bio->bi_size; 345b411b363SPhilipp Reisner 346b411b363SPhilipp Reisner e->private_bio = bio; 347b411b363SPhilipp Reisner e->block_id = id; 348b411b363SPhilipp Reisner INIT_HLIST_NODE(&e->colision); 349b411b363SPhilipp Reisner e->epoch = NULL; 350b411b363SPhilipp Reisner e->flags = 0; 351b411b363SPhilipp Reisner 352b411b363SPhilipp Reisner return e; 353b411b363SPhilipp Reisner 354b411b363SPhilipp Reisner fail2: 355b411b363SPhilipp Reisner drbd_pp_free_bio_pages(mdev, bio); 356b411b363SPhilipp Reisner bio_put(bio); 357b411b363SPhilipp Reisner fail1: 358b411b363SPhilipp Reisner mempool_free(e, drbd_ee_mempool); 359b411b363SPhilipp Reisner 360b411b363SPhilipp Reisner return NULL; 361b411b363SPhilipp Reisner } 362b411b363SPhilipp Reisner 363b411b363SPhilipp Reisner void drbd_free_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e) 364b411b363SPhilipp Reisner { 365b411b363SPhilipp Reisner struct bio *bio = e->private_bio; 366b411b363SPhilipp Reisner drbd_pp_free_bio_pages(mdev, bio); 367b411b363SPhilipp Reisner bio_put(bio); 368b411b363SPhilipp Reisner D_ASSERT(hlist_unhashed(&e->colision)); 369b411b363SPhilipp Reisner mempool_free(e, drbd_ee_mempool); 370b411b363SPhilipp Reisner } 371b411b363SPhilipp Reisner 372b411b363SPhilipp Reisner int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list) 373b411b363SPhilipp Reisner { 374b411b363SPhilipp Reisner LIST_HEAD(work_list); 375b411b363SPhilipp Reisner struct drbd_epoch_entry *e, *t; 376b411b363SPhilipp Reisner int count = 0; 377b411b363SPhilipp Reisner 378b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 379b411b363SPhilipp Reisner list_splice_init(list, &work_list); 380b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 381b411b363SPhilipp Reisner 382b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &work_list, w.list) { 383b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 384b411b363SPhilipp Reisner count++; 385b411b363SPhilipp Reisner } 386b411b363SPhilipp Reisner return count; 387b411b363SPhilipp Reisner } 388b411b363SPhilipp Reisner 389b411b363SPhilipp Reisner 390b411b363SPhilipp Reisner /* 391b411b363SPhilipp Reisner * This function is called from _asender only_ 392b411b363SPhilipp Reisner * but see also comments in _req_mod(,barrier_acked) 393b411b363SPhilipp Reisner * and receive_Barrier. 394b411b363SPhilipp Reisner * 395b411b363SPhilipp Reisner * Move entries from net_ee to done_ee, if ready. 396b411b363SPhilipp Reisner * Grab done_ee, call all callbacks, free the entries. 397b411b363SPhilipp Reisner * The callbacks typically send out ACKs. 398b411b363SPhilipp Reisner */ 399b411b363SPhilipp Reisner static int drbd_process_done_ee(struct drbd_conf *mdev) 400b411b363SPhilipp Reisner { 401b411b363SPhilipp Reisner LIST_HEAD(work_list); 402b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 403b411b363SPhilipp Reisner struct drbd_epoch_entry *e, *t; 404b411b363SPhilipp Reisner int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS); 405b411b363SPhilipp Reisner 406b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 407b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 408b411b363SPhilipp Reisner list_splice_init(&mdev->done_ee, &work_list); 409b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 410b411b363SPhilipp Reisner 411b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &reclaimed, w.list) 412b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 413b411b363SPhilipp Reisner 414b411b363SPhilipp Reisner /* possible callbacks here: 415b411b363SPhilipp Reisner * e_end_block, and e_end_resync_block, e_send_discard_ack. 416b411b363SPhilipp Reisner * all ignore the last argument. 417b411b363SPhilipp Reisner */ 418b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &work_list, w.list) { 419b411b363SPhilipp Reisner /* list_del not necessary, next/prev members not touched */ 420b411b363SPhilipp Reisner ok = e->w.cb(mdev, &e->w, !ok) && ok; 421b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 422b411b363SPhilipp Reisner } 423b411b363SPhilipp Reisner wake_up(&mdev->ee_wait); 424b411b363SPhilipp Reisner 425b411b363SPhilipp Reisner return ok; 426b411b363SPhilipp Reisner } 427b411b363SPhilipp Reisner 428b411b363SPhilipp Reisner void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 429b411b363SPhilipp Reisner { 430b411b363SPhilipp Reisner DEFINE_WAIT(wait); 431b411b363SPhilipp Reisner 432b411b363SPhilipp Reisner /* avoids spin_lock/unlock 433b411b363SPhilipp Reisner * and calling prepare_to_wait in the fast path */ 434b411b363SPhilipp Reisner while (!list_empty(head)) { 435b411b363SPhilipp Reisner prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); 436b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 437b411b363SPhilipp Reisner drbd_kick_lo(mdev); 438b411b363SPhilipp Reisner schedule(); 439b411b363SPhilipp Reisner finish_wait(&mdev->ee_wait, &wait); 440b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 441b411b363SPhilipp Reisner } 442b411b363SPhilipp Reisner } 443b411b363SPhilipp Reisner 444b411b363SPhilipp Reisner void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 445b411b363SPhilipp Reisner { 446b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 447b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, head); 448b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 449b411b363SPhilipp Reisner } 450b411b363SPhilipp Reisner 451b411b363SPhilipp Reisner /* see also kernel_accept; which is only present since 2.6.18. 452b411b363SPhilipp Reisner * also we want to log which part of it failed, exactly */ 453b411b363SPhilipp Reisner static int drbd_accept(struct drbd_conf *mdev, const char **what, 454b411b363SPhilipp Reisner struct socket *sock, struct socket **newsock) 455b411b363SPhilipp Reisner { 456b411b363SPhilipp Reisner struct sock *sk = sock->sk; 457b411b363SPhilipp Reisner int err = 0; 458b411b363SPhilipp Reisner 459b411b363SPhilipp Reisner *what = "listen"; 460b411b363SPhilipp Reisner err = sock->ops->listen(sock, 5); 461b411b363SPhilipp Reisner if (err < 0) 462b411b363SPhilipp Reisner goto out; 463b411b363SPhilipp Reisner 464b411b363SPhilipp Reisner *what = "sock_create_lite"; 465b411b363SPhilipp Reisner err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 466b411b363SPhilipp Reisner newsock); 467b411b363SPhilipp Reisner if (err < 0) 468b411b363SPhilipp Reisner goto out; 469b411b363SPhilipp Reisner 470b411b363SPhilipp Reisner *what = "accept"; 471b411b363SPhilipp Reisner err = sock->ops->accept(sock, *newsock, 0); 472b411b363SPhilipp Reisner if (err < 0) { 473b411b363SPhilipp Reisner sock_release(*newsock); 474b411b363SPhilipp Reisner *newsock = NULL; 475b411b363SPhilipp Reisner goto out; 476b411b363SPhilipp Reisner } 477b411b363SPhilipp Reisner (*newsock)->ops = sock->ops; 478b411b363SPhilipp Reisner 479b411b363SPhilipp Reisner out: 480b411b363SPhilipp Reisner return err; 481b411b363SPhilipp Reisner } 482b411b363SPhilipp Reisner 483b411b363SPhilipp Reisner static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock, 484b411b363SPhilipp Reisner void *buf, size_t size, int flags) 485b411b363SPhilipp Reisner { 486b411b363SPhilipp Reisner mm_segment_t oldfs; 487b411b363SPhilipp Reisner struct kvec iov = { 488b411b363SPhilipp Reisner .iov_base = buf, 489b411b363SPhilipp Reisner .iov_len = size, 490b411b363SPhilipp Reisner }; 491b411b363SPhilipp Reisner struct msghdr msg = { 492b411b363SPhilipp Reisner .msg_iovlen = 1, 493b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 494b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 495b411b363SPhilipp Reisner }; 496b411b363SPhilipp Reisner int rv; 497b411b363SPhilipp Reisner 498b411b363SPhilipp Reisner oldfs = get_fs(); 499b411b363SPhilipp Reisner set_fs(KERNEL_DS); 500b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 501b411b363SPhilipp Reisner set_fs(oldfs); 502b411b363SPhilipp Reisner 503b411b363SPhilipp Reisner return rv; 504b411b363SPhilipp Reisner } 505b411b363SPhilipp Reisner 506b411b363SPhilipp Reisner static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size) 507b411b363SPhilipp Reisner { 508b411b363SPhilipp Reisner mm_segment_t oldfs; 509b411b363SPhilipp Reisner struct kvec iov = { 510b411b363SPhilipp Reisner .iov_base = buf, 511b411b363SPhilipp Reisner .iov_len = size, 512b411b363SPhilipp Reisner }; 513b411b363SPhilipp Reisner struct msghdr msg = { 514b411b363SPhilipp Reisner .msg_iovlen = 1, 515b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 516b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 517b411b363SPhilipp Reisner }; 518b411b363SPhilipp Reisner int rv; 519b411b363SPhilipp Reisner 520b411b363SPhilipp Reisner oldfs = get_fs(); 521b411b363SPhilipp Reisner set_fs(KERNEL_DS); 522b411b363SPhilipp Reisner 523b411b363SPhilipp Reisner for (;;) { 524b411b363SPhilipp Reisner rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags); 525b411b363SPhilipp Reisner if (rv == size) 526b411b363SPhilipp Reisner break; 527b411b363SPhilipp Reisner 528b411b363SPhilipp Reisner /* Note: 529b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 530b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 531b411b363SPhilipp Reisner */ 532b411b363SPhilipp Reisner 533b411b363SPhilipp Reisner if (rv < 0) { 534b411b363SPhilipp Reisner if (rv == -ECONNRESET) 535b411b363SPhilipp Reisner dev_info(DEV, "sock was reset by peer\n"); 536b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 537b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 538b411b363SPhilipp Reisner break; 539b411b363SPhilipp Reisner } else if (rv == 0) { 540b411b363SPhilipp Reisner dev_info(DEV, "sock was shut down by peer\n"); 541b411b363SPhilipp Reisner break; 542b411b363SPhilipp Reisner } else { 543b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 544b411b363SPhilipp Reisner * after we read a partial message 545b411b363SPhilipp Reisner */ 546b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 547b411b363SPhilipp Reisner break; 548b411b363SPhilipp Reisner } 549b411b363SPhilipp Reisner }; 550b411b363SPhilipp Reisner 551b411b363SPhilipp Reisner set_fs(oldfs); 552b411b363SPhilipp Reisner 553b411b363SPhilipp Reisner if (rv != size) 554b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); 555b411b363SPhilipp Reisner 556b411b363SPhilipp Reisner return rv; 557b411b363SPhilipp Reisner } 558b411b363SPhilipp Reisner 559b411b363SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_conf *mdev) 560b411b363SPhilipp Reisner { 561b411b363SPhilipp Reisner const char *what; 562b411b363SPhilipp Reisner struct socket *sock; 563b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 564b411b363SPhilipp Reisner int err; 565b411b363SPhilipp Reisner int disconnect_on_error = 1; 566b411b363SPhilipp Reisner 567b411b363SPhilipp Reisner if (!get_net_conf(mdev)) 568b411b363SPhilipp Reisner return NULL; 569b411b363SPhilipp Reisner 570b411b363SPhilipp Reisner what = "sock_create_kern"; 571b411b363SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, 572b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 573b411b363SPhilipp Reisner if (err < 0) { 574b411b363SPhilipp Reisner sock = NULL; 575b411b363SPhilipp Reisner goto out; 576b411b363SPhilipp Reisner } 577b411b363SPhilipp Reisner 578b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 579b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ; 580b411b363SPhilipp Reisner 581b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 582b411b363SPhilipp Reisner * for the outgoing connections. 583b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 584b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 585b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 586b411b363SPhilipp Reisner * a free one dynamically. 587b411b363SPhilipp Reisner */ 588b411b363SPhilipp Reisner memcpy(&src_in6, mdev->net_conf->my_addr, 589b411b363SPhilipp Reisner min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6))); 590b411b363SPhilipp Reisner if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6) 591b411b363SPhilipp Reisner src_in6.sin6_port = 0; 592b411b363SPhilipp Reisner else 593b411b363SPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 594b411b363SPhilipp Reisner 595b411b363SPhilipp Reisner what = "bind before connect"; 596b411b363SPhilipp Reisner err = sock->ops->bind(sock, 597b411b363SPhilipp Reisner (struct sockaddr *) &src_in6, 598b411b363SPhilipp Reisner mdev->net_conf->my_addr_len); 599b411b363SPhilipp Reisner if (err < 0) 600b411b363SPhilipp Reisner goto out; 601b411b363SPhilipp Reisner 602b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 603b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 604b411b363SPhilipp Reisner disconnect_on_error = 0; 605b411b363SPhilipp Reisner what = "connect"; 606b411b363SPhilipp Reisner err = sock->ops->connect(sock, 607b411b363SPhilipp Reisner (struct sockaddr *)mdev->net_conf->peer_addr, 608b411b363SPhilipp Reisner mdev->net_conf->peer_addr_len, 0); 609b411b363SPhilipp Reisner 610b411b363SPhilipp Reisner out: 611b411b363SPhilipp Reisner if (err < 0) { 612b411b363SPhilipp Reisner if (sock) { 613b411b363SPhilipp Reisner sock_release(sock); 614b411b363SPhilipp Reisner sock = NULL; 615b411b363SPhilipp Reisner } 616b411b363SPhilipp Reisner switch (-err) { 617b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 618b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 619b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 620b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 621b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 622b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 623b411b363SPhilipp Reisner disconnect_on_error = 0; 624b411b363SPhilipp Reisner break; 625b411b363SPhilipp Reisner default: 626b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 627b411b363SPhilipp Reisner } 628b411b363SPhilipp Reisner if (disconnect_on_error) 629b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 630b411b363SPhilipp Reisner } 631b411b363SPhilipp Reisner put_net_conf(mdev); 632b411b363SPhilipp Reisner return sock; 633b411b363SPhilipp Reisner } 634b411b363SPhilipp Reisner 635b411b363SPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev) 636b411b363SPhilipp Reisner { 637b411b363SPhilipp Reisner int timeo, err; 638b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 639b411b363SPhilipp Reisner const char *what; 640b411b363SPhilipp Reisner 641b411b363SPhilipp Reisner if (!get_net_conf(mdev)) 642b411b363SPhilipp Reisner return NULL; 643b411b363SPhilipp Reisner 644b411b363SPhilipp Reisner what = "sock_create_kern"; 645b411b363SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, 646b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 647b411b363SPhilipp Reisner if (err) { 648b411b363SPhilipp Reisner s_listen = NULL; 649b411b363SPhilipp Reisner goto out; 650b411b363SPhilipp Reisner } 651b411b363SPhilipp Reisner 652b411b363SPhilipp Reisner timeo = mdev->net_conf->try_connect_int * HZ; 653b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 654b411b363SPhilipp Reisner 655b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 656b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 657b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 658b411b363SPhilipp Reisner 659b411b363SPhilipp Reisner what = "bind before listen"; 660b411b363SPhilipp Reisner err = s_listen->ops->bind(s_listen, 661b411b363SPhilipp Reisner (struct sockaddr *) mdev->net_conf->my_addr, 662b411b363SPhilipp Reisner mdev->net_conf->my_addr_len); 663b411b363SPhilipp Reisner if (err < 0) 664b411b363SPhilipp Reisner goto out; 665b411b363SPhilipp Reisner 666b411b363SPhilipp Reisner err = drbd_accept(mdev, &what, s_listen, &s_estab); 667b411b363SPhilipp Reisner 668b411b363SPhilipp Reisner out: 669b411b363SPhilipp Reisner if (s_listen) 670b411b363SPhilipp Reisner sock_release(s_listen); 671b411b363SPhilipp Reisner if (err < 0) { 672b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 673b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 674b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 675b411b363SPhilipp Reisner } 676b411b363SPhilipp Reisner } 677b411b363SPhilipp Reisner put_net_conf(mdev); 678b411b363SPhilipp Reisner 679b411b363SPhilipp Reisner return s_estab; 680b411b363SPhilipp Reisner } 681b411b363SPhilipp Reisner 682b411b363SPhilipp Reisner static int drbd_send_fp(struct drbd_conf *mdev, 683b411b363SPhilipp Reisner struct socket *sock, enum drbd_packets cmd) 684b411b363SPhilipp Reisner { 685b411b363SPhilipp Reisner struct p_header *h = (struct p_header *) &mdev->data.sbuf.header; 686b411b363SPhilipp Reisner 687b411b363SPhilipp Reisner return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0); 688b411b363SPhilipp Reisner } 689b411b363SPhilipp Reisner 690b411b363SPhilipp Reisner static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock) 691b411b363SPhilipp Reisner { 692b411b363SPhilipp Reisner struct p_header *h = (struct p_header *) &mdev->data.sbuf.header; 693b411b363SPhilipp Reisner int rr; 694b411b363SPhilipp Reisner 695b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0); 696b411b363SPhilipp Reisner 697b411b363SPhilipp Reisner if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC) 698b411b363SPhilipp Reisner return be16_to_cpu(h->command); 699b411b363SPhilipp Reisner 700b411b363SPhilipp Reisner return 0xffff; 701b411b363SPhilipp Reisner } 702b411b363SPhilipp Reisner 703b411b363SPhilipp Reisner /** 704b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 705b411b363SPhilipp Reisner * @mdev: DRBD device. 706b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 707b411b363SPhilipp Reisner */ 708b411b363SPhilipp Reisner static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock) 709b411b363SPhilipp Reisner { 710b411b363SPhilipp Reisner int rr; 711b411b363SPhilipp Reisner char tb[4]; 712b411b363SPhilipp Reisner 713b411b363SPhilipp Reisner if (!*sock) 714b411b363SPhilipp Reisner return FALSE; 715b411b363SPhilipp Reisner 716b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 717b411b363SPhilipp Reisner 718b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 719b411b363SPhilipp Reisner return TRUE; 720b411b363SPhilipp Reisner } else { 721b411b363SPhilipp Reisner sock_release(*sock); 722b411b363SPhilipp Reisner *sock = NULL; 723b411b363SPhilipp Reisner return FALSE; 724b411b363SPhilipp Reisner } 725b411b363SPhilipp Reisner } 726b411b363SPhilipp Reisner 727b411b363SPhilipp Reisner /* 728b411b363SPhilipp Reisner * return values: 729b411b363SPhilipp Reisner * 1 yes, we have a valid connection 730b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 731b411b363SPhilipp Reisner * -1 peer talks different language, 732b411b363SPhilipp Reisner * no point in trying again, please go standalone. 733b411b363SPhilipp Reisner * -2 We do not have a network config... 734b411b363SPhilipp Reisner */ 735b411b363SPhilipp Reisner static int drbd_connect(struct drbd_conf *mdev) 736b411b363SPhilipp Reisner { 737b411b363SPhilipp Reisner struct socket *s, *sock, *msock; 738b411b363SPhilipp Reisner int try, h, ok; 739b411b363SPhilipp Reisner 740b411b363SPhilipp Reisner D_ASSERT(!mdev->data.socket); 741b411b363SPhilipp Reisner 742b411b363SPhilipp Reisner if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) 743b411b363SPhilipp Reisner dev_err(DEV, "CREATE_BARRIER flag was set in drbd_connect - now cleared!\n"); 744b411b363SPhilipp Reisner 745b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS) 746b411b363SPhilipp Reisner return -2; 747b411b363SPhilipp Reisner 748b411b363SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &mdev->flags); 749b411b363SPhilipp Reisner 750b411b363SPhilipp Reisner sock = NULL; 751b411b363SPhilipp Reisner msock = NULL; 752b411b363SPhilipp Reisner 753b411b363SPhilipp Reisner do { 754b411b363SPhilipp Reisner for (try = 0;;) { 755b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 756b411b363SPhilipp Reisner s = drbd_try_connect(mdev); 757b411b363SPhilipp Reisner if (s || ++try >= 3) 758b411b363SPhilipp Reisner break; 759b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 760b411b363SPhilipp Reisner __set_current_state(TASK_INTERRUPTIBLE); 761b411b363SPhilipp Reisner schedule_timeout(HZ / 10); 762b411b363SPhilipp Reisner } 763b411b363SPhilipp Reisner 764b411b363SPhilipp Reisner if (s) { 765b411b363SPhilipp Reisner if (!sock) { 766b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_S); 767b411b363SPhilipp Reisner sock = s; 768b411b363SPhilipp Reisner s = NULL; 769b411b363SPhilipp Reisner } else if (!msock) { 770b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_M); 771b411b363SPhilipp Reisner msock = s; 772b411b363SPhilipp Reisner s = NULL; 773b411b363SPhilipp Reisner } else { 774b411b363SPhilipp Reisner dev_err(DEV, "Logic error in drbd_connect()\n"); 775b411b363SPhilipp Reisner goto out_release_sockets; 776b411b363SPhilipp Reisner } 777b411b363SPhilipp Reisner } 778b411b363SPhilipp Reisner 779b411b363SPhilipp Reisner if (sock && msock) { 780b411b363SPhilipp Reisner __set_current_state(TASK_INTERRUPTIBLE); 781b411b363SPhilipp Reisner schedule_timeout(HZ / 10); 782b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 783b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 784b411b363SPhilipp Reisner if (ok) 785b411b363SPhilipp Reisner break; 786b411b363SPhilipp Reisner } 787b411b363SPhilipp Reisner 788b411b363SPhilipp Reisner retry: 789b411b363SPhilipp Reisner s = drbd_wait_for_connect(mdev); 790b411b363SPhilipp Reisner if (s) { 791b411b363SPhilipp Reisner try = drbd_recv_fp(mdev, s); 792b411b363SPhilipp Reisner drbd_socket_okay(mdev, &sock); 793b411b363SPhilipp Reisner drbd_socket_okay(mdev, &msock); 794b411b363SPhilipp Reisner switch (try) { 795b411b363SPhilipp Reisner case P_HAND_SHAKE_S: 796b411b363SPhilipp Reisner if (sock) { 797b411b363SPhilipp Reisner dev_warn(DEV, "initial packet S crossed\n"); 798b411b363SPhilipp Reisner sock_release(sock); 799b411b363SPhilipp Reisner } 800b411b363SPhilipp Reisner sock = s; 801b411b363SPhilipp Reisner break; 802b411b363SPhilipp Reisner case P_HAND_SHAKE_M: 803b411b363SPhilipp Reisner if (msock) { 804b411b363SPhilipp Reisner dev_warn(DEV, "initial packet M crossed\n"); 805b411b363SPhilipp Reisner sock_release(msock); 806b411b363SPhilipp Reisner } 807b411b363SPhilipp Reisner msock = s; 808b411b363SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &mdev->flags); 809b411b363SPhilipp Reisner break; 810b411b363SPhilipp Reisner default: 811b411b363SPhilipp Reisner dev_warn(DEV, "Error receiving initial packet\n"); 812b411b363SPhilipp Reisner sock_release(s); 813b411b363SPhilipp Reisner if (random32() & 1) 814b411b363SPhilipp Reisner goto retry; 815b411b363SPhilipp Reisner } 816b411b363SPhilipp Reisner } 817b411b363SPhilipp Reisner 818b411b363SPhilipp Reisner if (mdev->state.conn <= C_DISCONNECTING) 819b411b363SPhilipp Reisner goto out_release_sockets; 820b411b363SPhilipp Reisner if (signal_pending(current)) { 821b411b363SPhilipp Reisner flush_signals(current); 822b411b363SPhilipp Reisner smp_rmb(); 823b411b363SPhilipp Reisner if (get_t_state(&mdev->receiver) == Exiting) 824b411b363SPhilipp Reisner goto out_release_sockets; 825b411b363SPhilipp Reisner } 826b411b363SPhilipp Reisner 827b411b363SPhilipp Reisner if (sock && msock) { 828b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 829b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 830b411b363SPhilipp Reisner if (ok) 831b411b363SPhilipp Reisner break; 832b411b363SPhilipp Reisner } 833b411b363SPhilipp Reisner } while (1); 834b411b363SPhilipp Reisner 835b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 836b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 837b411b363SPhilipp Reisner 838b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 839b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 840b411b363SPhilipp Reisner 841b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 842b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 843b411b363SPhilipp Reisner 844b411b363SPhilipp Reisner if (mdev->net_conf->sndbuf_size) { 845b411b363SPhilipp Reisner sock->sk->sk_sndbuf = mdev->net_conf->sndbuf_size; 846b411b363SPhilipp Reisner sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 847b411b363SPhilipp Reisner } 848b411b363SPhilipp Reisner 849b411b363SPhilipp Reisner if (mdev->net_conf->rcvbuf_size) { 850b411b363SPhilipp Reisner sock->sk->sk_rcvbuf = mdev->net_conf->rcvbuf_size; 851b411b363SPhilipp Reisner sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 852b411b363SPhilipp Reisner } 853b411b363SPhilipp Reisner 854b411b363SPhilipp Reisner /* NOT YET ... 855b411b363SPhilipp Reisner * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 856b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 857b411b363SPhilipp Reisner * first set it to the P_HAND_SHAKE timeout, 858b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 859b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = 860b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10; 861b411b363SPhilipp Reisner 862b411b363SPhilipp Reisner msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 863b411b363SPhilipp Reisner msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 864b411b363SPhilipp Reisner 865b411b363SPhilipp Reisner /* we don't want delays. 866b411b363SPhilipp Reisner * we use TCP_CORK where apropriate, though */ 867b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 868b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 869b411b363SPhilipp Reisner 870b411b363SPhilipp Reisner mdev->data.socket = sock; 871b411b363SPhilipp Reisner mdev->meta.socket = msock; 872b411b363SPhilipp Reisner mdev->last_received = jiffies; 873b411b363SPhilipp Reisner 874b411b363SPhilipp Reisner D_ASSERT(mdev->asender.task == NULL); 875b411b363SPhilipp Reisner 876b411b363SPhilipp Reisner h = drbd_do_handshake(mdev); 877b411b363SPhilipp Reisner if (h <= 0) 878b411b363SPhilipp Reisner return h; 879b411b363SPhilipp Reisner 880b411b363SPhilipp Reisner if (mdev->cram_hmac_tfm) { 881b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 882b411b363SPhilipp Reisner if (!drbd_do_auth(mdev)) { 883b411b363SPhilipp Reisner dev_err(DEV, "Authentication of peer failed\n"); 884b411b363SPhilipp Reisner return -1; 885b411b363SPhilipp Reisner } 886b411b363SPhilipp Reisner } 887b411b363SPhilipp Reisner 888b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS) 889b411b363SPhilipp Reisner return 0; 890b411b363SPhilipp Reisner 891b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; 892b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 893b411b363SPhilipp Reisner 894b411b363SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 895b411b363SPhilipp Reisner mdev->peer_seq = 0; 896b411b363SPhilipp Reisner 897b411b363SPhilipp Reisner drbd_thread_start(&mdev->asender); 898b411b363SPhilipp Reisner 899b411b363SPhilipp Reisner drbd_send_protocol(mdev); 900b411b363SPhilipp Reisner drbd_send_sync_param(mdev, &mdev->sync_conf); 901b411b363SPhilipp Reisner drbd_send_sizes(mdev, 0); 902b411b363SPhilipp Reisner drbd_send_uuids(mdev); 903b411b363SPhilipp Reisner drbd_send_state(mdev); 904b411b363SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 905b411b363SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 906b411b363SPhilipp Reisner 907b411b363SPhilipp Reisner return 1; 908b411b363SPhilipp Reisner 909b411b363SPhilipp Reisner out_release_sockets: 910b411b363SPhilipp Reisner if (sock) 911b411b363SPhilipp Reisner sock_release(sock); 912b411b363SPhilipp Reisner if (msock) 913b411b363SPhilipp Reisner sock_release(msock); 914b411b363SPhilipp Reisner return -1; 915b411b363SPhilipp Reisner } 916b411b363SPhilipp Reisner 917b411b363SPhilipp Reisner static int drbd_recv_header(struct drbd_conf *mdev, struct p_header *h) 918b411b363SPhilipp Reisner { 919b411b363SPhilipp Reisner int r; 920b411b363SPhilipp Reisner 921b411b363SPhilipp Reisner r = drbd_recv(mdev, h, sizeof(*h)); 922b411b363SPhilipp Reisner 923b411b363SPhilipp Reisner if (unlikely(r != sizeof(*h))) { 924b411b363SPhilipp Reisner dev_err(DEV, "short read expecting header on sock: r=%d\n", r); 925b411b363SPhilipp Reisner return FALSE; 926b411b363SPhilipp Reisner }; 927b411b363SPhilipp Reisner h->command = be16_to_cpu(h->command); 928b411b363SPhilipp Reisner h->length = be16_to_cpu(h->length); 929b411b363SPhilipp Reisner if (unlikely(h->magic != BE_DRBD_MAGIC)) { 930b411b363SPhilipp Reisner dev_err(DEV, "magic?? on data m: 0x%lx c: %d l: %d\n", 931b411b363SPhilipp Reisner (long)be32_to_cpu(h->magic), 932b411b363SPhilipp Reisner h->command, h->length); 933b411b363SPhilipp Reisner return FALSE; 934b411b363SPhilipp Reisner } 935b411b363SPhilipp Reisner mdev->last_received = jiffies; 936b411b363SPhilipp Reisner 937b411b363SPhilipp Reisner return TRUE; 938b411b363SPhilipp Reisner } 939b411b363SPhilipp Reisner 940b411b363SPhilipp Reisner static enum finish_epoch drbd_flush_after_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch) 941b411b363SPhilipp Reisner { 942b411b363SPhilipp Reisner int rv; 943b411b363SPhilipp Reisner 944b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 945b411b363SPhilipp Reisner rv = blkdev_issue_flush(mdev->ldev->backing_bdev, NULL); 946b411b363SPhilipp Reisner if (rv) { 947b411b363SPhilipp Reisner dev_err(DEV, "local disk flush failed with status %d\n", rv); 948b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 949b411b363SPhilipp Reisner * don't try again for ANY return value != 0 950b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 951b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 952b411b363SPhilipp Reisner } 953b411b363SPhilipp Reisner put_ldev(mdev); 954b411b363SPhilipp Reisner } 955b411b363SPhilipp Reisner 956b411b363SPhilipp Reisner return drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE); 957b411b363SPhilipp Reisner } 958b411b363SPhilipp Reisner 959b411b363SPhilipp Reisner static int w_flush(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 960b411b363SPhilipp Reisner { 961b411b363SPhilipp Reisner struct flush_work *fw = (struct flush_work *)w; 962b411b363SPhilipp Reisner struct drbd_epoch *epoch = fw->epoch; 963b411b363SPhilipp Reisner 964b411b363SPhilipp Reisner kfree(w); 965b411b363SPhilipp Reisner 966b411b363SPhilipp Reisner if (!test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags)) 967b411b363SPhilipp Reisner drbd_flush_after_epoch(mdev, epoch); 968b411b363SPhilipp Reisner 969b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, epoch, EV_PUT | 970b411b363SPhilipp Reisner (mdev->state.conn < C_CONNECTED ? EV_CLEANUP : 0)); 971b411b363SPhilipp Reisner 972b411b363SPhilipp Reisner return 1; 973b411b363SPhilipp Reisner } 974b411b363SPhilipp Reisner 975b411b363SPhilipp Reisner /** 976b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 977b411b363SPhilipp Reisner * @mdev: DRBD device. 978b411b363SPhilipp Reisner * @epoch: Epoch object. 979b411b363SPhilipp Reisner * @ev: Epoch event. 980b411b363SPhilipp Reisner */ 981b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 982b411b363SPhilipp Reisner struct drbd_epoch *epoch, 983b411b363SPhilipp Reisner enum epoch_event ev) 984b411b363SPhilipp Reisner { 985b411b363SPhilipp Reisner int finish, epoch_size; 986b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 987b411b363SPhilipp Reisner int schedule_flush = 0; 988b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 989b411b363SPhilipp Reisner 990b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 991b411b363SPhilipp Reisner do { 992b411b363SPhilipp Reisner next_epoch = NULL; 993b411b363SPhilipp Reisner finish = 0; 994b411b363SPhilipp Reisner 995b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 996b411b363SPhilipp Reisner 997b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 998b411b363SPhilipp Reisner case EV_PUT: 999b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1000b411b363SPhilipp Reisner break; 1001b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1002b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1003b411b363SPhilipp Reisner 1004b411b363SPhilipp Reisner /* Special case: If we just switched from WO_bio_barrier to 1005b411b363SPhilipp Reisner WO_bdev_flush we should not finish the current epoch */ 1006b411b363SPhilipp Reisner if (test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags) && epoch_size == 1 && 1007b411b363SPhilipp Reisner mdev->write_ordering != WO_bio_barrier && 1008b411b363SPhilipp Reisner epoch == mdev->current_epoch) 1009b411b363SPhilipp Reisner clear_bit(DE_CONTAINS_A_BARRIER, &epoch->flags); 1010b411b363SPhilipp Reisner break; 1011b411b363SPhilipp Reisner case EV_BARRIER_DONE: 1012b411b363SPhilipp Reisner set_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags); 1013b411b363SPhilipp Reisner break; 1014b411b363SPhilipp Reisner case EV_BECAME_LAST: 1015b411b363SPhilipp Reisner /* nothing to do*/ 1016b411b363SPhilipp Reisner break; 1017b411b363SPhilipp Reisner } 1018b411b363SPhilipp Reisner 1019b411b363SPhilipp Reisner if (epoch_size != 0 && 1020b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 1021b411b363SPhilipp Reisner test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) && 1022b411b363SPhilipp Reisner epoch->list.prev == &mdev->current_epoch->list && 1023b411b363SPhilipp Reisner !test_bit(DE_IS_FINISHING, &epoch->flags)) { 1024b411b363SPhilipp Reisner /* Nearly all conditions are met to finish that epoch... */ 1025b411b363SPhilipp Reisner if (test_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags) || 1026b411b363SPhilipp Reisner mdev->write_ordering == WO_none || 1027b411b363SPhilipp Reisner (epoch_size == 1 && test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) || 1028b411b363SPhilipp Reisner ev & EV_CLEANUP) { 1029b411b363SPhilipp Reisner finish = 1; 1030b411b363SPhilipp Reisner set_bit(DE_IS_FINISHING, &epoch->flags); 1031b411b363SPhilipp Reisner } else if (!test_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags) && 1032b411b363SPhilipp Reisner mdev->write_ordering == WO_bio_barrier) { 1033b411b363SPhilipp Reisner atomic_inc(&epoch->active); 1034b411b363SPhilipp Reisner schedule_flush = 1; 1035b411b363SPhilipp Reisner } 1036b411b363SPhilipp Reisner } 1037b411b363SPhilipp Reisner if (finish) { 1038b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1039b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1040b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1041b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1042b411b363SPhilipp Reisner } 1043b411b363SPhilipp Reisner dec_unacked(mdev); 1044b411b363SPhilipp Reisner 1045b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1046b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1047b411b363SPhilipp Reisner list_del(&epoch->list); 1048b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1049b411b363SPhilipp Reisner mdev->epochs--; 1050b411b363SPhilipp Reisner kfree(epoch); 1051b411b363SPhilipp Reisner 1052b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1053b411b363SPhilipp Reisner rv = FE_DESTROYED; 1054b411b363SPhilipp Reisner } else { 1055b411b363SPhilipp Reisner epoch->flags = 0; 1056b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1057b411b363SPhilipp Reisner /* atomic_set(&epoch->active, 0); is alrady zero */ 1058b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1059b411b363SPhilipp Reisner rv = FE_RECYCLED; 1060b411b363SPhilipp Reisner } 1061b411b363SPhilipp Reisner } 1062b411b363SPhilipp Reisner 1063b411b363SPhilipp Reisner if (!next_epoch) 1064b411b363SPhilipp Reisner break; 1065b411b363SPhilipp Reisner 1066b411b363SPhilipp Reisner epoch = next_epoch; 1067b411b363SPhilipp Reisner } while (1); 1068b411b363SPhilipp Reisner 1069b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1070b411b363SPhilipp Reisner 1071b411b363SPhilipp Reisner if (schedule_flush) { 1072b411b363SPhilipp Reisner struct flush_work *fw; 1073b411b363SPhilipp Reisner fw = kmalloc(sizeof(*fw), GFP_ATOMIC); 1074b411b363SPhilipp Reisner if (fw) { 1075b411b363SPhilipp Reisner fw->w.cb = w_flush; 1076b411b363SPhilipp Reisner fw->epoch = epoch; 1077b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, &fw->w); 1078b411b363SPhilipp Reisner } else { 1079b411b363SPhilipp Reisner dev_warn(DEV, "Could not kmalloc a flush_work obj\n"); 1080b411b363SPhilipp Reisner set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags); 1081b411b363SPhilipp Reisner /* That is not a recursion, only one level */ 1082b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE); 1083b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, epoch, EV_PUT); 1084b411b363SPhilipp Reisner } 1085b411b363SPhilipp Reisner } 1086b411b363SPhilipp Reisner 1087b411b363SPhilipp Reisner return rv; 1088b411b363SPhilipp Reisner } 1089b411b363SPhilipp Reisner 1090b411b363SPhilipp Reisner /** 1091b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1092b411b363SPhilipp Reisner * @mdev: DRBD device. 1093b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1094b411b363SPhilipp Reisner */ 1095b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1096b411b363SPhilipp Reisner { 1097b411b363SPhilipp Reisner enum write_ordering_e pwo; 1098b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1099b411b363SPhilipp Reisner [WO_none] = "none", 1100b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1101b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1102b411b363SPhilipp Reisner [WO_bio_barrier] = "barrier", 1103b411b363SPhilipp Reisner }; 1104b411b363SPhilipp Reisner 1105b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1106b411b363SPhilipp Reisner wo = min(pwo, wo); 1107b411b363SPhilipp Reisner if (wo == WO_bio_barrier && mdev->ldev->dc.no_disk_barrier) 1108b411b363SPhilipp Reisner wo = WO_bdev_flush; 1109b411b363SPhilipp Reisner if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) 1110b411b363SPhilipp Reisner wo = WO_drain_io; 1111b411b363SPhilipp Reisner if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) 1112b411b363SPhilipp Reisner wo = WO_none; 1113b411b363SPhilipp Reisner mdev->write_ordering = wo; 1114b411b363SPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bio_barrier) 1115b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1116b411b363SPhilipp Reisner } 1117b411b363SPhilipp Reisner 1118b411b363SPhilipp Reisner /** 1119b411b363SPhilipp Reisner * w_e_reissue() - Worker callback; Resubmit a bio, without BIO_RW_BARRIER set 1120b411b363SPhilipp Reisner * @mdev: DRBD device. 1121b411b363SPhilipp Reisner * @w: work object. 1122b411b363SPhilipp Reisner * @cancel: The connection will be closed anyways (unused in this callback) 1123b411b363SPhilipp Reisner */ 1124b411b363SPhilipp Reisner int w_e_reissue(struct drbd_conf *mdev, struct drbd_work *w, int cancel) __releases(local) 1125b411b363SPhilipp Reisner { 1126b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1127b411b363SPhilipp Reisner struct bio *bio = e->private_bio; 1128b411b363SPhilipp Reisner 1129b411b363SPhilipp Reisner /* We leave DE_CONTAINS_A_BARRIER and EE_IS_BARRIER in place, 1130b411b363SPhilipp Reisner (and DE_BARRIER_IN_NEXT_EPOCH_ISSUED in the previous Epoch) 1131b411b363SPhilipp Reisner so that we can finish that epoch in drbd_may_finish_epoch(). 1132b411b363SPhilipp Reisner That is necessary if we already have a long chain of Epochs, before 1133b411b363SPhilipp Reisner we realize that BIO_RW_BARRIER is actually not supported */ 1134b411b363SPhilipp Reisner 1135b411b363SPhilipp Reisner /* As long as the -ENOTSUPP on the barrier is reported immediately 1136b411b363SPhilipp Reisner that will never trigger. If it is reported late, we will just 1137b411b363SPhilipp Reisner print that warning and continue correctly for all future requests 1138b411b363SPhilipp Reisner with WO_bdev_flush */ 1139b411b363SPhilipp Reisner if (previous_epoch(mdev, e->epoch)) 1140b411b363SPhilipp Reisner dev_warn(DEV, "Write ordering was not enforced (one time event)\n"); 1141b411b363SPhilipp Reisner 1142b411b363SPhilipp Reisner /* prepare bio for re-submit, 1143b411b363SPhilipp Reisner * re-init volatile members */ 1144b411b363SPhilipp Reisner /* we still have a local reference, 1145b411b363SPhilipp Reisner * get_ldev was done in receive_Data. */ 1146b411b363SPhilipp Reisner bio->bi_bdev = mdev->ldev->backing_bdev; 1147b411b363SPhilipp Reisner bio->bi_sector = e->sector; 1148b411b363SPhilipp Reisner bio->bi_size = e->size; 1149b411b363SPhilipp Reisner bio->bi_idx = 0; 1150b411b363SPhilipp Reisner 1151b411b363SPhilipp Reisner bio->bi_flags &= ~(BIO_POOL_MASK - 1); 1152b411b363SPhilipp Reisner bio->bi_flags |= 1 << BIO_UPTODATE; 1153b411b363SPhilipp Reisner 1154b411b363SPhilipp Reisner /* don't know whether this is necessary: */ 1155b411b363SPhilipp Reisner bio->bi_phys_segments = 0; 1156b411b363SPhilipp Reisner bio->bi_next = NULL; 1157b411b363SPhilipp Reisner 1158b411b363SPhilipp Reisner /* these should be unchanged: */ 1159b411b363SPhilipp Reisner /* bio->bi_end_io = drbd_endio_write_sec; */ 1160b411b363SPhilipp Reisner /* bio->bi_vcnt = whatever; */ 1161b411b363SPhilipp Reisner 1162b411b363SPhilipp Reisner e->w.cb = e_end_block; 1163b411b363SPhilipp Reisner 1164b411b363SPhilipp Reisner /* This is no longer a barrier request. */ 1165b411b363SPhilipp Reisner bio->bi_rw &= ~(1UL << BIO_RW_BARRIER); 1166b411b363SPhilipp Reisner 1167b411b363SPhilipp Reisner drbd_generic_make_request(mdev, DRBD_FAULT_DT_WR, bio); 1168b411b363SPhilipp Reisner 1169b411b363SPhilipp Reisner return 1; 1170b411b363SPhilipp Reisner } 1171b411b363SPhilipp Reisner 1172b411b363SPhilipp Reisner static int receive_Barrier(struct drbd_conf *mdev, struct p_header *h) 1173b411b363SPhilipp Reisner { 1174b411b363SPhilipp Reisner int rv, issue_flush; 1175b411b363SPhilipp Reisner struct p_barrier *p = (struct p_barrier *)h; 1176b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1177b411b363SPhilipp Reisner 1178b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; 1179b411b363SPhilipp Reisner 1180b411b363SPhilipp Reisner rv = drbd_recv(mdev, h->payload, h->length); 1181b411b363SPhilipp Reisner ERR_IF(rv != h->length) return FALSE; 1182b411b363SPhilipp Reisner 1183b411b363SPhilipp Reisner inc_unacked(mdev); 1184b411b363SPhilipp Reisner 1185b411b363SPhilipp Reisner if (mdev->net_conf->wire_protocol != DRBD_PROT_C) 1186b411b363SPhilipp Reisner drbd_kick_lo(mdev); 1187b411b363SPhilipp Reisner 1188b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1189b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1190b411b363SPhilipp Reisner 1191b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1192b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1193b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1194b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1195b411b363SPhilipp Reisner * completed. */ 1196b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1197b411b363SPhilipp Reisner case WO_bio_barrier: 1198b411b363SPhilipp Reisner case WO_none: 1199b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 1200b411b363SPhilipp Reisner return TRUE; 1201b411b363SPhilipp Reisner break; 1202b411b363SPhilipp Reisner 1203b411b363SPhilipp Reisner case WO_bdev_flush: 1204b411b363SPhilipp Reisner case WO_drain_io: 1205b411b363SPhilipp Reisner D_ASSERT(rv == FE_STILL_LIVE); 1206b411b363SPhilipp Reisner set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags); 1207b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 1208b411b363SPhilipp Reisner rv = drbd_flush_after_epoch(mdev, mdev->current_epoch); 1209b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 1210b411b363SPhilipp Reisner return TRUE; 1211b411b363SPhilipp Reisner 1212b411b363SPhilipp Reisner /* The asender will send all the ACKs and barrier ACKs out, since 1213b411b363SPhilipp Reisner all EEs moved from the active_ee to the done_ee. We need to 1214b411b363SPhilipp Reisner provide a new epoch object for the EEs that come in soon */ 1215b411b363SPhilipp Reisner break; 1216b411b363SPhilipp Reisner } 1217b411b363SPhilipp Reisner 1218b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1219b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1220b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 1221b411b363SPhilipp Reisner if (!epoch) { 1222b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 1223b411b363SPhilipp Reisner issue_flush = !test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags); 1224b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 1225b411b363SPhilipp Reisner if (issue_flush) { 1226b411b363SPhilipp Reisner rv = drbd_flush_after_epoch(mdev, mdev->current_epoch); 1227b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 1228b411b363SPhilipp Reisner return TRUE; 1229b411b363SPhilipp Reisner } 1230b411b363SPhilipp Reisner 1231b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->done_ee); 1232b411b363SPhilipp Reisner 1233b411b363SPhilipp Reisner return TRUE; 1234b411b363SPhilipp Reisner } 1235b411b363SPhilipp Reisner 1236b411b363SPhilipp Reisner epoch->flags = 0; 1237b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1238b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1239b411b363SPhilipp Reisner 1240b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1241b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1242b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1243b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1244b411b363SPhilipp Reisner mdev->epochs++; 1245b411b363SPhilipp Reisner } else { 1246b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1247b411b363SPhilipp Reisner kfree(epoch); 1248b411b363SPhilipp Reisner } 1249b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1250b411b363SPhilipp Reisner 1251b411b363SPhilipp Reisner return TRUE; 1252b411b363SPhilipp Reisner } 1253b411b363SPhilipp Reisner 1254b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1255b411b363SPhilipp Reisner * and from receive_Data */ 1256b411b363SPhilipp Reisner static struct drbd_epoch_entry * 1257b411b363SPhilipp Reisner read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local) 1258b411b363SPhilipp Reisner { 1259b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1260b411b363SPhilipp Reisner struct bio_vec *bvec; 1261b411b363SPhilipp Reisner struct page *page; 1262b411b363SPhilipp Reisner struct bio *bio; 1263b411b363SPhilipp Reisner int dgs, ds, i, rr; 1264b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1265b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 1266b411b363SPhilipp Reisner 1267b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1268b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1269b411b363SPhilipp Reisner 1270b411b363SPhilipp Reisner if (dgs) { 1271b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1272b411b363SPhilipp Reisner if (rr != dgs) { 1273b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data digest: read %d expected %d\n", 1274b411b363SPhilipp Reisner rr, dgs); 1275b411b363SPhilipp Reisner return NULL; 1276b411b363SPhilipp Reisner } 1277b411b363SPhilipp Reisner } 1278b411b363SPhilipp Reisner 1279b411b363SPhilipp Reisner data_size -= dgs; 1280b411b363SPhilipp Reisner 1281b411b363SPhilipp Reisner ERR_IF(data_size & 0x1ff) return NULL; 1282b411b363SPhilipp Reisner ERR_IF(data_size > DRBD_MAX_SEGMENT_SIZE) return NULL; 1283b411b363SPhilipp Reisner 1284b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1285b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1286b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1287b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); 1288b411b363SPhilipp Reisner if (!e) 1289b411b363SPhilipp Reisner return NULL; 1290b411b363SPhilipp Reisner bio = e->private_bio; 1291b411b363SPhilipp Reisner ds = data_size; 1292b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1293b411b363SPhilipp Reisner page = bvec->bv_page; 1294b411b363SPhilipp Reisner rr = drbd_recv(mdev, kmap(page), min_t(int, ds, PAGE_SIZE)); 1295b411b363SPhilipp Reisner kunmap(page); 1296b411b363SPhilipp Reisner if (rr != min_t(int, ds, PAGE_SIZE)) { 1297b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1298b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 1299b411b363SPhilipp Reisner rr, min_t(int, ds, PAGE_SIZE)); 1300b411b363SPhilipp Reisner return NULL; 1301b411b363SPhilipp Reisner } 1302b411b363SPhilipp Reisner ds -= rr; 1303b411b363SPhilipp Reisner } 1304b411b363SPhilipp Reisner 1305b411b363SPhilipp Reisner if (dgs) { 1306b411b363SPhilipp Reisner drbd_csum(mdev, mdev->integrity_r_tfm, bio, dig_vv); 1307b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1308b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED.\n"); 1309b411b363SPhilipp Reisner drbd_bcast_ee(mdev, "digest failed", 1310b411b363SPhilipp Reisner dgs, dig_in, dig_vv, e); 1311b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1312b411b363SPhilipp Reisner return NULL; 1313b411b363SPhilipp Reisner } 1314b411b363SPhilipp Reisner } 1315b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1316b411b363SPhilipp Reisner return e; 1317b411b363SPhilipp Reisner } 1318b411b363SPhilipp Reisner 1319b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1320b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1321b411b363SPhilipp Reisner */ 1322b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1323b411b363SPhilipp Reisner { 1324b411b363SPhilipp Reisner struct page *page; 1325b411b363SPhilipp Reisner int rr, rv = 1; 1326b411b363SPhilipp Reisner void *data; 1327b411b363SPhilipp Reisner 1328b411b363SPhilipp Reisner page = drbd_pp_alloc(mdev, 1); 1329b411b363SPhilipp Reisner 1330b411b363SPhilipp Reisner data = kmap(page); 1331b411b363SPhilipp Reisner while (data_size) { 1332b411b363SPhilipp Reisner rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); 1333b411b363SPhilipp Reisner if (rr != min_t(int, data_size, PAGE_SIZE)) { 1334b411b363SPhilipp Reisner rv = 0; 1335b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 1336b411b363SPhilipp Reisner rr, min_t(int, data_size, PAGE_SIZE)); 1337b411b363SPhilipp Reisner break; 1338b411b363SPhilipp Reisner } 1339b411b363SPhilipp Reisner data_size -= rr; 1340b411b363SPhilipp Reisner } 1341b411b363SPhilipp Reisner kunmap(page); 1342b411b363SPhilipp Reisner drbd_pp_free(mdev, page); 1343b411b363SPhilipp Reisner return rv; 1344b411b363SPhilipp Reisner } 1345b411b363SPhilipp Reisner 1346b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1347b411b363SPhilipp Reisner sector_t sector, int data_size) 1348b411b363SPhilipp Reisner { 1349b411b363SPhilipp Reisner struct bio_vec *bvec; 1350b411b363SPhilipp Reisner struct bio *bio; 1351b411b363SPhilipp Reisner int dgs, rr, i, expect; 1352b411b363SPhilipp Reisner void *dig_in = mdev->int_dig_in; 1353b411b363SPhilipp Reisner void *dig_vv = mdev->int_dig_vv; 1354b411b363SPhilipp Reisner 1355b411b363SPhilipp Reisner dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? 1356b411b363SPhilipp Reisner crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; 1357b411b363SPhilipp Reisner 1358b411b363SPhilipp Reisner if (dgs) { 1359b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1360b411b363SPhilipp Reisner if (rr != dgs) { 1361b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n", 1362b411b363SPhilipp Reisner rr, dgs); 1363b411b363SPhilipp Reisner return 0; 1364b411b363SPhilipp Reisner } 1365b411b363SPhilipp Reisner } 1366b411b363SPhilipp Reisner 1367b411b363SPhilipp Reisner data_size -= dgs; 1368b411b363SPhilipp Reisner 1369b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1370b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1371b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1372b411b363SPhilipp Reisner 1373b411b363SPhilipp Reisner bio = req->master_bio; 1374b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1375b411b363SPhilipp Reisner 1376b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1377b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1378b411b363SPhilipp Reisner rr = drbd_recv(mdev, 1379b411b363SPhilipp Reisner kmap(bvec->bv_page)+bvec->bv_offset, 1380b411b363SPhilipp Reisner expect); 1381b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1382b411b363SPhilipp Reisner if (rr != expect) { 1383b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply: " 1384b411b363SPhilipp Reisner "read %d expected %d\n", 1385b411b363SPhilipp Reisner rr, expect); 1386b411b363SPhilipp Reisner return 0; 1387b411b363SPhilipp Reisner } 1388b411b363SPhilipp Reisner data_size -= rr; 1389b411b363SPhilipp Reisner } 1390b411b363SPhilipp Reisner 1391b411b363SPhilipp Reisner if (dgs) { 1392b411b363SPhilipp Reisner drbd_csum(mdev, mdev->integrity_r_tfm, bio, dig_vv); 1393b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1394b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 1395b411b363SPhilipp Reisner return 0; 1396b411b363SPhilipp Reisner } 1397b411b363SPhilipp Reisner } 1398b411b363SPhilipp Reisner 1399b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 1400b411b363SPhilipp Reisner return 1; 1401b411b363SPhilipp Reisner } 1402b411b363SPhilipp Reisner 1403b411b363SPhilipp Reisner /* e_end_resync_block() is called via 1404b411b363SPhilipp Reisner * drbd_process_done_ee() by asender only */ 1405b411b363SPhilipp Reisner static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1406b411b363SPhilipp Reisner { 1407b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1408b411b363SPhilipp Reisner sector_t sector = e->sector; 1409b411b363SPhilipp Reisner int ok; 1410b411b363SPhilipp Reisner 1411b411b363SPhilipp Reisner D_ASSERT(hlist_unhashed(&e->colision)); 1412b411b363SPhilipp Reisner 1413b411b363SPhilipp Reisner if (likely(drbd_bio_uptodate(e->private_bio))) { 1414b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1415b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e); 1416b411b363SPhilipp Reisner } else { 1417b411b363SPhilipp Reisner /* Record failure to sync */ 1418b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, e->size); 1419b411b363SPhilipp Reisner 1420b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1421b411b363SPhilipp Reisner } 1422b411b363SPhilipp Reisner dec_unacked(mdev); 1423b411b363SPhilipp Reisner 1424b411b363SPhilipp Reisner return ok; 1425b411b363SPhilipp Reisner } 1426b411b363SPhilipp Reisner 1427b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1428b411b363SPhilipp Reisner { 1429b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1430b411b363SPhilipp Reisner 1431b411b363SPhilipp Reisner e = read_in_block(mdev, ID_SYNCER, sector, data_size); 1432b411b363SPhilipp Reisner if (!e) { 1433b411b363SPhilipp Reisner put_ldev(mdev); 1434b411b363SPhilipp Reisner return FALSE; 1435b411b363SPhilipp Reisner } 1436b411b363SPhilipp Reisner 1437b411b363SPhilipp Reisner dec_rs_pending(mdev); 1438b411b363SPhilipp Reisner 1439b411b363SPhilipp Reisner e->private_bio->bi_end_io = drbd_endio_write_sec; 1440b411b363SPhilipp Reisner e->private_bio->bi_rw = WRITE; 1441b411b363SPhilipp Reisner e->w.cb = e_end_resync_block; 1442b411b363SPhilipp Reisner 1443b411b363SPhilipp Reisner inc_unacked(mdev); 1444b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1445b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1446b411b363SPhilipp Reisner 1447b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1448b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->sync_ee); 1449b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1450b411b363SPhilipp Reisner 1451b411b363SPhilipp Reisner drbd_generic_make_request(mdev, DRBD_FAULT_RS_WR, e->private_bio); 1452b411b363SPhilipp Reisner /* accounting done in endio */ 1453b411b363SPhilipp Reisner 1454b411b363SPhilipp Reisner maybe_kick_lo(mdev); 1455b411b363SPhilipp Reisner return TRUE; 1456b411b363SPhilipp Reisner } 1457b411b363SPhilipp Reisner 1458b411b363SPhilipp Reisner static int receive_DataReply(struct drbd_conf *mdev, struct p_header *h) 1459b411b363SPhilipp Reisner { 1460b411b363SPhilipp Reisner struct drbd_request *req; 1461b411b363SPhilipp Reisner sector_t sector; 1462b411b363SPhilipp Reisner unsigned int header_size, data_size; 1463b411b363SPhilipp Reisner int ok; 1464b411b363SPhilipp Reisner struct p_data *p = (struct p_data *)h; 1465b411b363SPhilipp Reisner 1466b411b363SPhilipp Reisner header_size = sizeof(*p) - sizeof(*h); 1467b411b363SPhilipp Reisner data_size = h->length - header_size; 1468b411b363SPhilipp Reisner 1469b411b363SPhilipp Reisner ERR_IF(data_size == 0) return FALSE; 1470b411b363SPhilipp Reisner 1471b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, header_size) != header_size) 1472b411b363SPhilipp Reisner return FALSE; 1473b411b363SPhilipp Reisner 1474b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1475b411b363SPhilipp Reisner 1476b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1477b411b363SPhilipp Reisner req = _ar_id_to_req(mdev, p->block_id, sector); 1478b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1479b411b363SPhilipp Reisner if (unlikely(!req)) { 1480b411b363SPhilipp Reisner dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n"); 1481b411b363SPhilipp Reisner return FALSE; 1482b411b363SPhilipp Reisner } 1483b411b363SPhilipp Reisner 1484b411b363SPhilipp Reisner /* hlist_del(&req->colision) is done in _req_may_be_done, to avoid 1485b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1486b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1487b411b363SPhilipp Reisner ok = recv_dless_read(mdev, req, sector, data_size); 1488b411b363SPhilipp Reisner 1489b411b363SPhilipp Reisner if (ok) 1490b411b363SPhilipp Reisner req_mod(req, data_received); 1491b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1492b411b363SPhilipp Reisner * I don't think we may complete this just yet 1493b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1494b411b363SPhilipp Reisner 1495b411b363SPhilipp Reisner return ok; 1496b411b363SPhilipp Reisner } 1497b411b363SPhilipp Reisner 1498b411b363SPhilipp Reisner static int receive_RSDataReply(struct drbd_conf *mdev, struct p_header *h) 1499b411b363SPhilipp Reisner { 1500b411b363SPhilipp Reisner sector_t sector; 1501b411b363SPhilipp Reisner unsigned int header_size, data_size; 1502b411b363SPhilipp Reisner int ok; 1503b411b363SPhilipp Reisner struct p_data *p = (struct p_data *)h; 1504b411b363SPhilipp Reisner 1505b411b363SPhilipp Reisner header_size = sizeof(*p) - sizeof(*h); 1506b411b363SPhilipp Reisner data_size = h->length - header_size; 1507b411b363SPhilipp Reisner 1508b411b363SPhilipp Reisner ERR_IF(data_size == 0) return FALSE; 1509b411b363SPhilipp Reisner 1510b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, header_size) != header_size) 1511b411b363SPhilipp Reisner return FALSE; 1512b411b363SPhilipp Reisner 1513b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1514b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1515b411b363SPhilipp Reisner 1516b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1517b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1518b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1519b411b363SPhilipp Reisner * or in drbd_endio_write_sec. */ 1520b411b363SPhilipp Reisner ok = recv_resync_read(mdev, sector, data_size); 1521b411b363SPhilipp Reisner } else { 1522b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1523b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1524b411b363SPhilipp Reisner 1525b411b363SPhilipp Reisner ok = drbd_drain_block(mdev, data_size); 1526b411b363SPhilipp Reisner 1527b411b363SPhilipp Reisner drbd_send_ack_dp(mdev, P_NEG_ACK, p); 1528b411b363SPhilipp Reisner } 1529b411b363SPhilipp Reisner 1530b411b363SPhilipp Reisner return ok; 1531b411b363SPhilipp Reisner } 1532b411b363SPhilipp Reisner 1533b411b363SPhilipp Reisner /* e_end_block() is called via drbd_process_done_ee(). 1534b411b363SPhilipp Reisner * this means this function only runs in the asender thread 1535b411b363SPhilipp Reisner */ 1536b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1537b411b363SPhilipp Reisner { 1538b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1539b411b363SPhilipp Reisner sector_t sector = e->sector; 1540b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1541b411b363SPhilipp Reisner int ok = 1, pcmd; 1542b411b363SPhilipp Reisner 1543b411b363SPhilipp Reisner if (e->flags & EE_IS_BARRIER) { 1544b411b363SPhilipp Reisner epoch = previous_epoch(mdev, e->epoch); 1545b411b363SPhilipp Reisner if (epoch) 1546b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE + (cancel ? EV_CLEANUP : 0)); 1547b411b363SPhilipp Reisner } 1548b411b363SPhilipp Reisner 1549b411b363SPhilipp Reisner if (mdev->net_conf->wire_protocol == DRBD_PROT_C) { 1550b411b363SPhilipp Reisner if (likely(drbd_bio_uptodate(e->private_bio))) { 1551b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1552b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1553b411b363SPhilipp Reisner e->flags & EE_MAY_SET_IN_SYNC) ? 1554b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 1555b411b363SPhilipp Reisner ok &= drbd_send_ack(mdev, pcmd, e); 1556b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1557b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, e->size); 1558b411b363SPhilipp Reisner } else { 1559b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1560b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1561b411b363SPhilipp Reisner * maybe assert this? */ 1562b411b363SPhilipp Reisner } 1563b411b363SPhilipp Reisner dec_unacked(mdev); 1564b411b363SPhilipp Reisner } 1565b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1566b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 1567b411b363SPhilipp Reisner if (mdev->net_conf->two_primaries) { 1568b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1569b411b363SPhilipp Reisner D_ASSERT(!hlist_unhashed(&e->colision)); 1570b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1571b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1572b411b363SPhilipp Reisner } else { 1573b411b363SPhilipp Reisner D_ASSERT(hlist_unhashed(&e->colision)); 1574b411b363SPhilipp Reisner } 1575b411b363SPhilipp Reisner 1576b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1577b411b363SPhilipp Reisner 1578b411b363SPhilipp Reisner return ok; 1579b411b363SPhilipp Reisner } 1580b411b363SPhilipp Reisner 1581b411b363SPhilipp Reisner static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1582b411b363SPhilipp Reisner { 1583b411b363SPhilipp Reisner struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; 1584b411b363SPhilipp Reisner int ok = 1; 1585b411b363SPhilipp Reisner 1586b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1587b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_DISCARD_ACK, e); 1588b411b363SPhilipp Reisner 1589b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1590b411b363SPhilipp Reisner D_ASSERT(!hlist_unhashed(&e->colision)); 1591b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1592b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1593b411b363SPhilipp Reisner 1594b411b363SPhilipp Reisner dec_unacked(mdev); 1595b411b363SPhilipp Reisner 1596b411b363SPhilipp Reisner return ok; 1597b411b363SPhilipp Reisner } 1598b411b363SPhilipp Reisner 1599b411b363SPhilipp Reisner /* Called from receive_Data. 1600b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1601b411b363SPhilipp Reisner * 1602b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1603b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1604b411b363SPhilipp Reisner * been sent. 1605b411b363SPhilipp Reisner * 1606b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1607b411b363SPhilipp Reisner * 1608b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1609b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1610b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1611b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1612b411b363SPhilipp Reisner * 1613b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1614b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1615b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1616b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1617b411b363SPhilipp Reisner * 1618b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1619b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 1620b411b363SPhilipp Reisner static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) 1621b411b363SPhilipp Reisner { 1622b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1623b411b363SPhilipp Reisner unsigned int p_seq; 1624b411b363SPhilipp Reisner long timeout; 1625b411b363SPhilipp Reisner int ret = 0; 1626b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1627b411b363SPhilipp Reisner for (;;) { 1628b411b363SPhilipp Reisner prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1629b411b363SPhilipp Reisner if (seq_le(packet_seq, mdev->peer_seq+1)) 1630b411b363SPhilipp Reisner break; 1631b411b363SPhilipp Reisner if (signal_pending(current)) { 1632b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1633b411b363SPhilipp Reisner break; 1634b411b363SPhilipp Reisner } 1635b411b363SPhilipp Reisner p_seq = mdev->peer_seq; 1636b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1637b411b363SPhilipp Reisner timeout = schedule_timeout(30*HZ); 1638b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1639b411b363SPhilipp Reisner if (timeout == 0 && p_seq == mdev->peer_seq) { 1640b411b363SPhilipp Reisner ret = -ETIMEDOUT; 1641b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); 1642b411b363SPhilipp Reisner break; 1643b411b363SPhilipp Reisner } 1644b411b363SPhilipp Reisner } 1645b411b363SPhilipp Reisner finish_wait(&mdev->seq_wait, &wait); 1646b411b363SPhilipp Reisner if (mdev->peer_seq+1 == packet_seq) 1647b411b363SPhilipp Reisner mdev->peer_seq++; 1648b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1649b411b363SPhilipp Reisner return ret; 1650b411b363SPhilipp Reisner } 1651b411b363SPhilipp Reisner 1652b411b363SPhilipp Reisner /* mirrored write */ 1653b411b363SPhilipp Reisner static int receive_Data(struct drbd_conf *mdev, struct p_header *h) 1654b411b363SPhilipp Reisner { 1655b411b363SPhilipp Reisner sector_t sector; 1656b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1657b411b363SPhilipp Reisner struct p_data *p = (struct p_data *)h; 1658b411b363SPhilipp Reisner int header_size, data_size; 1659b411b363SPhilipp Reisner int rw = WRITE; 1660b411b363SPhilipp Reisner u32 dp_flags; 1661b411b363SPhilipp Reisner 1662b411b363SPhilipp Reisner header_size = sizeof(*p) - sizeof(*h); 1663b411b363SPhilipp Reisner data_size = h->length - header_size; 1664b411b363SPhilipp Reisner 1665b411b363SPhilipp Reisner ERR_IF(data_size == 0) return FALSE; 1666b411b363SPhilipp Reisner 1667b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, header_size) != header_size) 1668b411b363SPhilipp Reisner return FALSE; 1669b411b363SPhilipp Reisner 1670b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 1671b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1672b411b363SPhilipp Reisner dev_err(DEV, "Can not write mirrored data block " 1673b411b363SPhilipp Reisner "to local disk.\n"); 1674b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1675b411b363SPhilipp Reisner if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) 1676b411b363SPhilipp Reisner mdev->peer_seq++; 1677b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1678b411b363SPhilipp Reisner 1679b411b363SPhilipp Reisner drbd_send_ack_dp(mdev, P_NEG_ACK, p); 1680b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 1681b411b363SPhilipp Reisner return drbd_drain_block(mdev, data_size); 1682b411b363SPhilipp Reisner } 1683b411b363SPhilipp Reisner 1684b411b363SPhilipp Reisner /* get_ldev(mdev) successful. 1685b411b363SPhilipp Reisner * Corresponding put_ldev done either below (on various errors), 1686b411b363SPhilipp Reisner * or in drbd_endio_write_sec, if we successfully submit the data at 1687b411b363SPhilipp Reisner * the end of this function. */ 1688b411b363SPhilipp Reisner 1689b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1690b411b363SPhilipp Reisner e = read_in_block(mdev, p->block_id, sector, data_size); 1691b411b363SPhilipp Reisner if (!e) { 1692b411b363SPhilipp Reisner put_ldev(mdev); 1693b411b363SPhilipp Reisner return FALSE; 1694b411b363SPhilipp Reisner } 1695b411b363SPhilipp Reisner 1696b411b363SPhilipp Reisner e->private_bio->bi_end_io = drbd_endio_write_sec; 1697b411b363SPhilipp Reisner e->w.cb = e_end_block; 1698b411b363SPhilipp Reisner 1699b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1700b411b363SPhilipp Reisner e->epoch = mdev->current_epoch; 1701b411b363SPhilipp Reisner atomic_inc(&e->epoch->epoch_size); 1702b411b363SPhilipp Reisner atomic_inc(&e->epoch->active); 1703b411b363SPhilipp Reisner 1704b411b363SPhilipp Reisner if (mdev->write_ordering == WO_bio_barrier && atomic_read(&e->epoch->epoch_size) == 1) { 1705b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1706b411b363SPhilipp Reisner /* Issue a barrier if we start a new epoch, and the previous epoch 1707b411b363SPhilipp Reisner was not a epoch containing a single request which already was 1708b411b363SPhilipp Reisner a Barrier. */ 1709b411b363SPhilipp Reisner epoch = list_entry(e->epoch->list.prev, struct drbd_epoch, list); 1710b411b363SPhilipp Reisner if (epoch == e->epoch) { 1711b411b363SPhilipp Reisner set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags); 1712b411b363SPhilipp Reisner rw |= (1<<BIO_RW_BARRIER); 1713b411b363SPhilipp Reisner e->flags |= EE_IS_BARRIER; 1714b411b363SPhilipp Reisner } else { 1715b411b363SPhilipp Reisner if (atomic_read(&epoch->epoch_size) > 1 || 1716b411b363SPhilipp Reisner !test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) { 1717b411b363SPhilipp Reisner set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags); 1718b411b363SPhilipp Reisner set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags); 1719b411b363SPhilipp Reisner rw |= (1<<BIO_RW_BARRIER); 1720b411b363SPhilipp Reisner e->flags |= EE_IS_BARRIER; 1721b411b363SPhilipp Reisner } 1722b411b363SPhilipp Reisner } 1723b411b363SPhilipp Reisner } 1724b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1725b411b363SPhilipp Reisner 1726b411b363SPhilipp Reisner dp_flags = be32_to_cpu(p->dp_flags); 1727b411b363SPhilipp Reisner if (dp_flags & DP_HARDBARRIER) { 1728b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED would have submitted barrier request\n"); 1729b411b363SPhilipp Reisner /* rw |= (1<<BIO_RW_BARRIER); */ 1730b411b363SPhilipp Reisner } 1731b411b363SPhilipp Reisner if (dp_flags & DP_RW_SYNC) 1732b411b363SPhilipp Reisner rw |= (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); 1733b411b363SPhilipp Reisner if (dp_flags & DP_MAY_SET_IN_SYNC) 1734b411b363SPhilipp Reisner e->flags |= EE_MAY_SET_IN_SYNC; 1735b411b363SPhilipp Reisner 1736b411b363SPhilipp Reisner /* I'm the receiver, I do hold a net_cnt reference. */ 1737b411b363SPhilipp Reisner if (!mdev->net_conf->two_primaries) { 1738b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1739b411b363SPhilipp Reisner } else { 1740b411b363SPhilipp Reisner /* don't get the req_lock yet, 1741b411b363SPhilipp Reisner * we may sleep in drbd_wait_peer_seq */ 1742b411b363SPhilipp Reisner const int size = e->size; 1743b411b363SPhilipp Reisner const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1744b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1745b411b363SPhilipp Reisner struct drbd_request *i; 1746b411b363SPhilipp Reisner struct hlist_node *n; 1747b411b363SPhilipp Reisner struct hlist_head *slot; 1748b411b363SPhilipp Reisner int first; 1749b411b363SPhilipp Reisner 1750b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 1751b411b363SPhilipp Reisner BUG_ON(mdev->ee_hash == NULL); 1752b411b363SPhilipp Reisner BUG_ON(mdev->tl_hash == NULL); 1753b411b363SPhilipp Reisner 1754b411b363SPhilipp Reisner /* conflict detection and handling: 1755b411b363SPhilipp Reisner * 1. wait on the sequence number, 1756b411b363SPhilipp Reisner * in case this data packet overtook ACK packets. 1757b411b363SPhilipp Reisner * 2. check our hash tables for conflicting requests. 1758b411b363SPhilipp Reisner * we only need to walk the tl_hash, since an ee can not 1759b411b363SPhilipp Reisner * have a conflict with an other ee: on the submitting 1760b411b363SPhilipp Reisner * node, the corresponding req had already been conflicting, 1761b411b363SPhilipp Reisner * and a conflicting req is never sent. 1762b411b363SPhilipp Reisner * 1763b411b363SPhilipp Reisner * Note: for two_primaries, we are protocol C, 1764b411b363SPhilipp Reisner * so there cannot be any request that is DONE 1765b411b363SPhilipp Reisner * but still on the transfer log. 1766b411b363SPhilipp Reisner * 1767b411b363SPhilipp Reisner * unconditionally add to the ee_hash. 1768b411b363SPhilipp Reisner * 1769b411b363SPhilipp Reisner * if no conflicting request is found: 1770b411b363SPhilipp Reisner * submit. 1771b411b363SPhilipp Reisner * 1772b411b363SPhilipp Reisner * if any conflicting request is found 1773b411b363SPhilipp Reisner * that has not yet been acked, 1774b411b363SPhilipp Reisner * AND I have the "discard concurrent writes" flag: 1775b411b363SPhilipp Reisner * queue (via done_ee) the P_DISCARD_ACK; OUT. 1776b411b363SPhilipp Reisner * 1777b411b363SPhilipp Reisner * if any conflicting request is found: 1778b411b363SPhilipp Reisner * block the receiver, waiting on misc_wait 1779b411b363SPhilipp Reisner * until no more conflicting requests are there, 1780b411b363SPhilipp Reisner * or we get interrupted (disconnect). 1781b411b363SPhilipp Reisner * 1782b411b363SPhilipp Reisner * we do not just write after local io completion of those 1783b411b363SPhilipp Reisner * requests, but only after req is done completely, i.e. 1784b411b363SPhilipp Reisner * we wait for the P_DISCARD_ACK to arrive! 1785b411b363SPhilipp Reisner * 1786b411b363SPhilipp Reisner * then proceed normally, i.e. submit. 1787b411b363SPhilipp Reisner */ 1788b411b363SPhilipp Reisner if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) 1789b411b363SPhilipp Reisner goto out_interrupted; 1790b411b363SPhilipp Reisner 1791b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1792b411b363SPhilipp Reisner 1793b411b363SPhilipp Reisner hlist_add_head(&e->colision, ee_hash_slot(mdev, sector)); 1794b411b363SPhilipp Reisner 1795b411b363SPhilipp Reisner #define OVERLAPS overlaps(i->sector, i->size, sector, size) 1796b411b363SPhilipp Reisner slot = tl_hash_slot(mdev, sector); 1797b411b363SPhilipp Reisner first = 1; 1798b411b363SPhilipp Reisner for (;;) { 1799b411b363SPhilipp Reisner int have_unacked = 0; 1800b411b363SPhilipp Reisner int have_conflict = 0; 1801b411b363SPhilipp Reisner prepare_to_wait(&mdev->misc_wait, &wait, 1802b411b363SPhilipp Reisner TASK_INTERRUPTIBLE); 1803b411b363SPhilipp Reisner hlist_for_each_entry(i, n, slot, colision) { 1804b411b363SPhilipp Reisner if (OVERLAPS) { 1805b411b363SPhilipp Reisner /* only ALERT on first iteration, 1806b411b363SPhilipp Reisner * we may be woken up early... */ 1807b411b363SPhilipp Reisner if (first) 1808b411b363SPhilipp Reisner dev_alert(DEV, "%s[%u] Concurrent local write detected!" 1809b411b363SPhilipp Reisner " new: %llus +%u; pending: %llus +%u\n", 1810b411b363SPhilipp Reisner current->comm, current->pid, 1811b411b363SPhilipp Reisner (unsigned long long)sector, size, 1812b411b363SPhilipp Reisner (unsigned long long)i->sector, i->size); 1813b411b363SPhilipp Reisner if (i->rq_state & RQ_NET_PENDING) 1814b411b363SPhilipp Reisner ++have_unacked; 1815b411b363SPhilipp Reisner ++have_conflict; 1816b411b363SPhilipp Reisner } 1817b411b363SPhilipp Reisner } 1818b411b363SPhilipp Reisner #undef OVERLAPS 1819b411b363SPhilipp Reisner if (!have_conflict) 1820b411b363SPhilipp Reisner break; 1821b411b363SPhilipp Reisner 1822b411b363SPhilipp Reisner /* Discard Ack only for the _first_ iteration */ 1823b411b363SPhilipp Reisner if (first && discard && have_unacked) { 1824b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", 1825b411b363SPhilipp Reisner (unsigned long long)sector); 1826b411b363SPhilipp Reisner inc_unacked(mdev); 1827b411b363SPhilipp Reisner e->w.cb = e_send_discard_ack; 1828b411b363SPhilipp Reisner list_add_tail(&e->w.list, &mdev->done_ee); 1829b411b363SPhilipp Reisner 1830b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1831b411b363SPhilipp Reisner 1832b411b363SPhilipp Reisner /* we could probably send that P_DISCARD_ACK ourselves, 1833b411b363SPhilipp Reisner * but I don't like the receiver using the msock */ 1834b411b363SPhilipp Reisner 1835b411b363SPhilipp Reisner put_ldev(mdev); 1836b411b363SPhilipp Reisner wake_asender(mdev); 1837b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1838b411b363SPhilipp Reisner return TRUE; 1839b411b363SPhilipp Reisner } 1840b411b363SPhilipp Reisner 1841b411b363SPhilipp Reisner if (signal_pending(current)) { 1842b411b363SPhilipp Reisner hlist_del_init(&e->colision); 1843b411b363SPhilipp Reisner 1844b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1845b411b363SPhilipp Reisner 1846b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1847b411b363SPhilipp Reisner goto out_interrupted; 1848b411b363SPhilipp Reisner } 1849b411b363SPhilipp Reisner 1850b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1851b411b363SPhilipp Reisner if (first) { 1852b411b363SPhilipp Reisner first = 0; 1853b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " 1854b411b363SPhilipp Reisner "sec=%llus\n", (unsigned long long)sector); 1855b411b363SPhilipp Reisner } else if (discard) { 1856b411b363SPhilipp Reisner /* we had none on the first iteration. 1857b411b363SPhilipp Reisner * there must be none now. */ 1858b411b363SPhilipp Reisner D_ASSERT(have_unacked == 0); 1859b411b363SPhilipp Reisner } 1860b411b363SPhilipp Reisner schedule(); 1861b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1862b411b363SPhilipp Reisner } 1863b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1864b411b363SPhilipp Reisner } 1865b411b363SPhilipp Reisner 1866b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->active_ee); 1867b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1868b411b363SPhilipp Reisner 1869b411b363SPhilipp Reisner switch (mdev->net_conf->wire_protocol) { 1870b411b363SPhilipp Reisner case DRBD_PROT_C: 1871b411b363SPhilipp Reisner inc_unacked(mdev); 1872b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 1873b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1874b411b363SPhilipp Reisner break; 1875b411b363SPhilipp Reisner case DRBD_PROT_B: 1876b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 1877b411b363SPhilipp Reisner * sends on the msock, but anyways */ 1878b411b363SPhilipp Reisner drbd_send_ack(mdev, P_RECV_ACK, e); 1879b411b363SPhilipp Reisner break; 1880b411b363SPhilipp Reisner case DRBD_PROT_A: 1881b411b363SPhilipp Reisner /* nothing to do */ 1882b411b363SPhilipp Reisner break; 1883b411b363SPhilipp Reisner } 1884b411b363SPhilipp Reisner 1885b411b363SPhilipp Reisner if (mdev->state.pdsk == D_DISKLESS) { 1886b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 1887b411b363SPhilipp Reisner drbd_set_out_of_sync(mdev, e->sector, e->size); 1888b411b363SPhilipp Reisner e->flags |= EE_CALL_AL_COMPLETE_IO; 1889b411b363SPhilipp Reisner drbd_al_begin_io(mdev, e->sector); 1890b411b363SPhilipp Reisner } 1891b411b363SPhilipp Reisner 1892b411b363SPhilipp Reisner e->private_bio->bi_rw = rw; 1893b411b363SPhilipp Reisner drbd_generic_make_request(mdev, DRBD_FAULT_DT_WR, e->private_bio); 1894b411b363SPhilipp Reisner /* accounting done in endio */ 1895b411b363SPhilipp Reisner 1896b411b363SPhilipp Reisner maybe_kick_lo(mdev); 1897b411b363SPhilipp Reisner return TRUE; 1898b411b363SPhilipp Reisner 1899b411b363SPhilipp Reisner out_interrupted: 1900b411b363SPhilipp Reisner /* yes, the epoch_size now is imbalanced. 1901b411b363SPhilipp Reisner * but we drop the connection anyways, so we don't have a chance to 1902b411b363SPhilipp Reisner * receive a barrier... atomic_inc(&mdev->epoch_size); */ 1903b411b363SPhilipp Reisner put_ldev(mdev); 1904b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1905b411b363SPhilipp Reisner return FALSE; 1906b411b363SPhilipp Reisner } 1907b411b363SPhilipp Reisner 1908b411b363SPhilipp Reisner static int receive_DataRequest(struct drbd_conf *mdev, struct p_header *h) 1909b411b363SPhilipp Reisner { 1910b411b363SPhilipp Reisner sector_t sector; 1911b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1912b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 1913b411b363SPhilipp Reisner struct digest_info *di = NULL; 1914b411b363SPhilipp Reisner int size, digest_size; 1915b411b363SPhilipp Reisner unsigned int fault_type; 1916b411b363SPhilipp Reisner struct p_block_req *p = 1917b411b363SPhilipp Reisner (struct p_block_req *)h; 1918b411b363SPhilipp Reisner const int brps = sizeof(*p)-sizeof(*h); 1919b411b363SPhilipp Reisner 1920b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, brps) != brps) 1921b411b363SPhilipp Reisner return FALSE; 1922b411b363SPhilipp Reisner 1923b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1924b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 1925b411b363SPhilipp Reisner 1926b411b363SPhilipp Reisner if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) { 1927b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 1928b411b363SPhilipp Reisner (unsigned long long)sector, size); 1929b411b363SPhilipp Reisner return FALSE; 1930b411b363SPhilipp Reisner } 1931b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 1932b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 1933b411b363SPhilipp Reisner (unsigned long long)sector, size); 1934b411b363SPhilipp Reisner return FALSE; 1935b411b363SPhilipp Reisner } 1936b411b363SPhilipp Reisner 1937b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 1938b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1939b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 1940b411b363SPhilipp Reisner "no local data.\n"); 1941b411b363SPhilipp Reisner drbd_send_ack_rp(mdev, h->command == P_DATA_REQUEST ? P_NEG_DREPLY : 1942b411b363SPhilipp Reisner P_NEG_RS_DREPLY , p); 1943b411b363SPhilipp Reisner return TRUE; 1944b411b363SPhilipp Reisner } 1945b411b363SPhilipp Reisner 1946b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1947b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1948b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1949b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); 1950b411b363SPhilipp Reisner if (!e) { 1951b411b363SPhilipp Reisner put_ldev(mdev); 1952b411b363SPhilipp Reisner return FALSE; 1953b411b363SPhilipp Reisner } 1954b411b363SPhilipp Reisner 1955b411b363SPhilipp Reisner e->private_bio->bi_rw = READ; 1956b411b363SPhilipp Reisner e->private_bio->bi_end_io = drbd_endio_read_sec; 1957b411b363SPhilipp Reisner 1958b411b363SPhilipp Reisner switch (h->command) { 1959b411b363SPhilipp Reisner case P_DATA_REQUEST: 1960b411b363SPhilipp Reisner e->w.cb = w_e_end_data_req; 1961b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 1962b411b363SPhilipp Reisner break; 1963b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 1964b411b363SPhilipp Reisner e->w.cb = w_e_end_rsdata_req; 1965b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 1966b411b363SPhilipp Reisner /* Eventually this should become asynchronously. Currently it 1967b411b363SPhilipp Reisner * blocks the whole receiver just to delay the reading of a 1968b411b363SPhilipp Reisner * resync data block. 1969b411b363SPhilipp Reisner * the drbd_work_queue mechanism is made for this... 1970b411b363SPhilipp Reisner */ 1971b411b363SPhilipp Reisner if (!drbd_rs_begin_io(mdev, sector)) { 1972b411b363SPhilipp Reisner /* we have been interrupted, 1973b411b363SPhilipp Reisner * probably connection lost! */ 1974b411b363SPhilipp Reisner D_ASSERT(signal_pending(current)); 1975b411b363SPhilipp Reisner goto out_free_e; 1976b411b363SPhilipp Reisner } 1977b411b363SPhilipp Reisner break; 1978b411b363SPhilipp Reisner 1979b411b363SPhilipp Reisner case P_OV_REPLY: 1980b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 1981b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 1982b411b363SPhilipp Reisner digest_size = h->length - brps ; 1983b411b363SPhilipp Reisner di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); 1984b411b363SPhilipp Reisner if (!di) 1985b411b363SPhilipp Reisner goto out_free_e; 1986b411b363SPhilipp Reisner 1987b411b363SPhilipp Reisner di->digest_size = digest_size; 1988b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 1989b411b363SPhilipp Reisner 1990b411b363SPhilipp Reisner if (drbd_recv(mdev, di->digest, digest_size) != digest_size) 1991b411b363SPhilipp Reisner goto out_free_e; 1992b411b363SPhilipp Reisner 1993b411b363SPhilipp Reisner e->block_id = (u64)(unsigned long)di; 1994b411b363SPhilipp Reisner if (h->command == P_CSUM_RS_REQUEST) { 1995b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 1996b411b363SPhilipp Reisner e->w.cb = w_e_end_csum_rs_req; 1997b411b363SPhilipp Reisner } else if (h->command == P_OV_REPLY) { 1998b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_reply; 1999b411b363SPhilipp Reisner dec_rs_pending(mdev); 2000b411b363SPhilipp Reisner break; 2001b411b363SPhilipp Reisner } 2002b411b363SPhilipp Reisner 2003b411b363SPhilipp Reisner if (!drbd_rs_begin_io(mdev, sector)) { 2004b411b363SPhilipp Reisner /* we have been interrupted, probably connection lost! */ 2005b411b363SPhilipp Reisner D_ASSERT(signal_pending(current)); 2006b411b363SPhilipp Reisner goto out_free_e; 2007b411b363SPhilipp Reisner } 2008b411b363SPhilipp Reisner break; 2009b411b363SPhilipp Reisner 2010b411b363SPhilipp Reisner case P_OV_REQUEST: 2011b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && 2012b411b363SPhilipp Reisner mdev->state.conn != C_VERIFY_T) 2013b411b363SPhilipp Reisner dev_warn(DEV, "ASSERT FAILED: got P_OV_REQUEST while being %s\n", 2014b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 2015b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 2016b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90) { 2017b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2018b411b363SPhilipp Reisner mdev->ov_position = sector; 2019b411b363SPhilipp Reisner mdev->ov_left = mdev->rs_total - BM_SECT_TO_BIT(sector); 2020b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2021b411b363SPhilipp Reisner (unsigned long long)sector); 2022b411b363SPhilipp Reisner } 2023b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_req; 2024b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2025b411b363SPhilipp Reisner /* Eventually this should become asynchronous. Currently it 2026b411b363SPhilipp Reisner * blocks the whole receiver just to delay the reading of a 2027b411b363SPhilipp Reisner * resync data block. 2028b411b363SPhilipp Reisner * the drbd_work_queue mechanism is made for this... 2029b411b363SPhilipp Reisner */ 2030b411b363SPhilipp Reisner if (!drbd_rs_begin_io(mdev, sector)) { 2031b411b363SPhilipp Reisner /* we have been interrupted, 2032b411b363SPhilipp Reisner * probably connection lost! */ 2033b411b363SPhilipp Reisner D_ASSERT(signal_pending(current)); 2034b411b363SPhilipp Reisner goto out_free_e; 2035b411b363SPhilipp Reisner } 2036b411b363SPhilipp Reisner break; 2037b411b363SPhilipp Reisner 2038b411b363SPhilipp Reisner 2039b411b363SPhilipp Reisner default: 2040b411b363SPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 2041b411b363SPhilipp Reisner cmdname(h->command)); 2042b411b363SPhilipp Reisner fault_type = DRBD_FAULT_MAX; 2043b411b363SPhilipp Reisner } 2044b411b363SPhilipp Reisner 2045b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 2046b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->read_ee); 2047b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 2048b411b363SPhilipp Reisner 2049b411b363SPhilipp Reisner inc_unacked(mdev); 2050b411b363SPhilipp Reisner 2051b411b363SPhilipp Reisner drbd_generic_make_request(mdev, fault_type, e->private_bio); 2052b411b363SPhilipp Reisner maybe_kick_lo(mdev); 2053b411b363SPhilipp Reisner 2054b411b363SPhilipp Reisner return TRUE; 2055b411b363SPhilipp Reisner 2056b411b363SPhilipp Reisner out_free_e: 2057b411b363SPhilipp Reisner kfree(di); 2058b411b363SPhilipp Reisner put_ldev(mdev); 2059b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 2060b411b363SPhilipp Reisner return FALSE; 2061b411b363SPhilipp Reisner } 2062b411b363SPhilipp Reisner 2063b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2064b411b363SPhilipp Reisner { 2065b411b363SPhilipp Reisner int self, peer, rv = -100; 2066b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 2067b411b363SPhilipp Reisner 2068b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2069b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2070b411b363SPhilipp Reisner 2071b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2072b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2073b411b363SPhilipp Reisner 2074b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_0p) { 2075b411b363SPhilipp Reisner case ASB_CONSENSUS: 2076b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2077b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2078b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2079b411b363SPhilipp Reisner break; 2080b411b363SPhilipp Reisner case ASB_DISCONNECT: 2081b411b363SPhilipp Reisner break; 2082b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2083b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2084b411b363SPhilipp Reisner rv = -1; 2085b411b363SPhilipp Reisner break; 2086b411b363SPhilipp Reisner } 2087b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2088b411b363SPhilipp Reisner rv = 1; 2089b411b363SPhilipp Reisner break; 2090b411b363SPhilipp Reisner } 2091b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2092b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2093b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2094b411b363SPhilipp Reisner rv = 1; 2095b411b363SPhilipp Reisner break; 2096b411b363SPhilipp Reisner } 2097b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2098b411b363SPhilipp Reisner rv = -1; 2099b411b363SPhilipp Reisner break; 2100b411b363SPhilipp Reisner } 2101b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2102ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2103b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2104b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2105b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 2106b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2107b411b363SPhilipp Reisner ? -1 : 1; 2108b411b363SPhilipp Reisner break; 2109b411b363SPhilipp Reisner } else { 2110b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2111b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2112b411b363SPhilipp Reisner } 2113b411b363SPhilipp Reisner if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) 2114b411b363SPhilipp Reisner break; 2115b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2116b411b363SPhilipp Reisner if (ch_self < ch_peer) 2117b411b363SPhilipp Reisner rv = -1; 2118b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2119b411b363SPhilipp Reisner rv = 1; 2120b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2121b411b363SPhilipp Reisner /* Well, then use something else. */ 2122b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2123b411b363SPhilipp Reisner ? -1 : 1; 2124b411b363SPhilipp Reisner break; 2125b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2126b411b363SPhilipp Reisner rv = -1; 2127b411b363SPhilipp Reisner break; 2128b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2129b411b363SPhilipp Reisner rv = 1; 2130b411b363SPhilipp Reisner } 2131b411b363SPhilipp Reisner 2132b411b363SPhilipp Reisner return rv; 2133b411b363SPhilipp Reisner } 2134b411b363SPhilipp Reisner 2135b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2136b411b363SPhilipp Reisner { 2137b411b363SPhilipp Reisner int self, peer, hg, rv = -100; 2138b411b363SPhilipp Reisner 2139b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2140b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2141b411b363SPhilipp Reisner 2142b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_1p) { 2143b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2144b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2145b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2146b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2147b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2148b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2149b411b363SPhilipp Reisner break; 2150b411b363SPhilipp Reisner case ASB_DISCONNECT: 2151b411b363SPhilipp Reisner break; 2152b411b363SPhilipp Reisner case ASB_CONSENSUS: 2153b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2154b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2155b411b363SPhilipp Reisner rv = hg; 2156b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2157b411b363SPhilipp Reisner rv = hg; 2158b411b363SPhilipp Reisner break; 2159b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2160b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2161b411b363SPhilipp Reisner break; 2162b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2163b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2164b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2165b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2166b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2167b411b363SPhilipp Reisner self = drbd_set_role(mdev, R_SECONDARY, 0); 2168b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2169b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2170b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2171b411b363SPhilipp Reisner self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2172b411b363SPhilipp Reisner if (self != SS_SUCCESS) { 2173b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2174b411b363SPhilipp Reisner } else { 2175b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2176b411b363SPhilipp Reisner rv = hg; 2177b411b363SPhilipp Reisner } 2178b411b363SPhilipp Reisner } else 2179b411b363SPhilipp Reisner rv = hg; 2180b411b363SPhilipp Reisner } 2181b411b363SPhilipp Reisner 2182b411b363SPhilipp Reisner return rv; 2183b411b363SPhilipp Reisner } 2184b411b363SPhilipp Reisner 2185b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2186b411b363SPhilipp Reisner { 2187b411b363SPhilipp Reisner int self, peer, hg, rv = -100; 2188b411b363SPhilipp Reisner 2189b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2190b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2191b411b363SPhilipp Reisner 2192b411b363SPhilipp Reisner switch (mdev->net_conf->after_sb_2p) { 2193b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2194b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2195b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2196b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2197b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2198b411b363SPhilipp Reisner case ASB_CONSENSUS: 2199b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2200b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2201b411b363SPhilipp Reisner break; 2202b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2203b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2204b411b363SPhilipp Reisner break; 2205b411b363SPhilipp Reisner case ASB_DISCONNECT: 2206b411b363SPhilipp Reisner break; 2207b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2208b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2209b411b363SPhilipp Reisner if (hg == -1) { 2210b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2211b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2212b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2213b411b363SPhilipp Reisner self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2214b411b363SPhilipp Reisner if (self != SS_SUCCESS) { 2215b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2216b411b363SPhilipp Reisner } else { 2217b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2218b411b363SPhilipp Reisner rv = hg; 2219b411b363SPhilipp Reisner } 2220b411b363SPhilipp Reisner } else 2221b411b363SPhilipp Reisner rv = hg; 2222b411b363SPhilipp Reisner } 2223b411b363SPhilipp Reisner 2224b411b363SPhilipp Reisner return rv; 2225b411b363SPhilipp Reisner } 2226b411b363SPhilipp Reisner 2227b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2228b411b363SPhilipp Reisner u64 bits, u64 flags) 2229b411b363SPhilipp Reisner { 2230b411b363SPhilipp Reisner if (!uuid) { 2231b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2232b411b363SPhilipp Reisner return; 2233b411b363SPhilipp Reisner } 2234b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2235b411b363SPhilipp Reisner text, 2236b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2237b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2238b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2239b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2240b411b363SPhilipp Reisner (unsigned long long)bits, 2241b411b363SPhilipp Reisner (unsigned long long)flags); 2242b411b363SPhilipp Reisner } 2243b411b363SPhilipp Reisner 2244b411b363SPhilipp Reisner /* 2245b411b363SPhilipp Reisner 100 after split brain try auto recover 2246b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2247b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2248b411b363SPhilipp Reisner 0 no Sync 2249b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2250b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2251b411b363SPhilipp Reisner -100 after split brain, disconnect 2252b411b363SPhilipp Reisner -1000 unrelated data 2253b411b363SPhilipp Reisner */ 2254b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2255b411b363SPhilipp Reisner { 2256b411b363SPhilipp Reisner u64 self, peer; 2257b411b363SPhilipp Reisner int i, j; 2258b411b363SPhilipp Reisner 2259b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2260b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2261b411b363SPhilipp Reisner 2262b411b363SPhilipp Reisner *rule_nr = 10; 2263b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2264b411b363SPhilipp Reisner return 0; 2265b411b363SPhilipp Reisner 2266b411b363SPhilipp Reisner *rule_nr = 20; 2267b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2268b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2269b411b363SPhilipp Reisner return -2; 2270b411b363SPhilipp Reisner 2271b411b363SPhilipp Reisner *rule_nr = 30; 2272b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2273b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2274b411b363SPhilipp Reisner return 2; 2275b411b363SPhilipp Reisner 2276b411b363SPhilipp Reisner if (self == peer) { 2277b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2278b411b363SPhilipp Reisner 2279b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2280b411b363SPhilipp Reisner 2281b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2282b411b363SPhilipp Reisner return -1001; 2283b411b363SPhilipp Reisner 2284b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2285b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2286b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2287b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2288b411b363SPhilipp Reisner 2289b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2290b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2291b411b363SPhilipp Reisner *rule_nr = 34; 2292b411b363SPhilipp Reisner } else { 2293b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2294b411b363SPhilipp Reisner *rule_nr = 36; 2295b411b363SPhilipp Reisner } 2296b411b363SPhilipp Reisner 2297b411b363SPhilipp Reisner return 1; 2298b411b363SPhilipp Reisner } 2299b411b363SPhilipp Reisner 2300b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2301b411b363SPhilipp Reisner 2302b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2303b411b363SPhilipp Reisner return -1001; 2304b411b363SPhilipp Reisner 2305b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2306b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2307b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2308b411b363SPhilipp Reisner 2309b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2310b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2311b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2312b411b363SPhilipp Reisner 2313b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2314b411b363SPhilipp Reisner *rule_nr = 35; 2315b411b363SPhilipp Reisner } else { 2316b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2317b411b363SPhilipp Reisner *rule_nr = 37; 2318b411b363SPhilipp Reisner } 2319b411b363SPhilipp Reisner 2320b411b363SPhilipp Reisner return -1; 2321b411b363SPhilipp Reisner } 2322b411b363SPhilipp Reisner 2323b411b363SPhilipp Reisner /* Common power [off|failure] */ 2324b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2325b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2326b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2327b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2328b411b363SPhilipp Reisner *rule_nr = 40; 2329b411b363SPhilipp Reisner 2330b411b363SPhilipp Reisner switch (rct) { 2331b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2332b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2333b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2334b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 2335b411b363SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->flags); 2336b411b363SPhilipp Reisner return dc ? -1 : 1; 2337b411b363SPhilipp Reisner } 2338b411b363SPhilipp Reisner } 2339b411b363SPhilipp Reisner 2340b411b363SPhilipp Reisner *rule_nr = 50; 2341b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2342b411b363SPhilipp Reisner if (self == peer) 2343b411b363SPhilipp Reisner return -1; 2344b411b363SPhilipp Reisner 2345b411b363SPhilipp Reisner *rule_nr = 51; 2346b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2347b411b363SPhilipp Reisner if (self == peer) { 2348b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2349b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1); 2350b411b363SPhilipp Reisner if (self == peer) { 2351b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2352b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2353b411b363SPhilipp Reisner 2354b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2355b411b363SPhilipp Reisner return -1001; 2356b411b363SPhilipp Reisner 2357b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2358b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 2359b411b363SPhilipp Reisner return -1; 2360b411b363SPhilipp Reisner } 2361b411b363SPhilipp Reisner } 2362b411b363SPhilipp Reisner 2363b411b363SPhilipp Reisner *rule_nr = 60; 2364b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2365b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2366b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2367b411b363SPhilipp Reisner if (self == peer) 2368b411b363SPhilipp Reisner return -2; 2369b411b363SPhilipp Reisner } 2370b411b363SPhilipp Reisner 2371b411b363SPhilipp Reisner *rule_nr = 70; 2372b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2373b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2374b411b363SPhilipp Reisner if (self == peer) 2375b411b363SPhilipp Reisner return 1; 2376b411b363SPhilipp Reisner 2377b411b363SPhilipp Reisner *rule_nr = 71; 2378b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2379b411b363SPhilipp Reisner if (self == peer) { 2380b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1); 2381b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2382b411b363SPhilipp Reisner if (self == peer) { 2383b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2384b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2385b411b363SPhilipp Reisner 2386b411b363SPhilipp Reisner if (mdev->agreed_pro_version < 91) 2387b411b363SPhilipp Reisner return -1001; 2388b411b363SPhilipp Reisner 2389b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2390b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2391b411b363SPhilipp Reisner 2392b411b363SPhilipp Reisner dev_info(DEV, "Undid last start of resync:\n"); 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 2397b411b363SPhilipp Reisner return 1; 2398b411b363SPhilipp Reisner } 2399b411b363SPhilipp Reisner } 2400b411b363SPhilipp Reisner 2401b411b363SPhilipp Reisner 2402b411b363SPhilipp Reisner *rule_nr = 80; 2403b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2404b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2405b411b363SPhilipp Reisner if (self == peer) 2406b411b363SPhilipp Reisner return 2; 2407b411b363SPhilipp Reisner } 2408b411b363SPhilipp Reisner 2409b411b363SPhilipp Reisner *rule_nr = 90; 2410b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2411b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2412b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2413b411b363SPhilipp Reisner return 100; 2414b411b363SPhilipp Reisner 2415b411b363SPhilipp Reisner *rule_nr = 100; 2416b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2417b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2418b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2419b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2420b411b363SPhilipp Reisner if (self == peer) 2421b411b363SPhilipp Reisner return -100; 2422b411b363SPhilipp Reisner } 2423b411b363SPhilipp Reisner } 2424b411b363SPhilipp Reisner 2425b411b363SPhilipp Reisner return -1000; 2426b411b363SPhilipp Reisner } 2427b411b363SPhilipp Reisner 2428b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2429b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2430b411b363SPhilipp Reisner */ 2431b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2432b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2433b411b363SPhilipp Reisner { 2434b411b363SPhilipp Reisner int hg, rule_nr; 2435b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2436b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 2437b411b363SPhilipp Reisner 2438b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2439b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2440b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2441b411b363SPhilipp Reisner 2442b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2443b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2444b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2445b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2446b411b363SPhilipp Reisner 2447b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2448b411b363SPhilipp Reisner 2449b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2450b411b363SPhilipp Reisner 2451b411b363SPhilipp Reisner if (hg == -1000) { 2452b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2453b411b363SPhilipp Reisner return C_MASK; 2454b411b363SPhilipp Reisner } 2455b411b363SPhilipp Reisner if (hg == -1001) { 2456b411b363SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol\n"); 2457b411b363SPhilipp Reisner return C_MASK; 2458b411b363SPhilipp Reisner } 2459b411b363SPhilipp Reisner 2460b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2461b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2462b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2463b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2464b411b363SPhilipp Reisner if (f) 2465b411b363SPhilipp Reisner hg = hg*2; 2466b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2467b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2468b411b363SPhilipp Reisner } 2469b411b363SPhilipp Reisner 2470b411b363SPhilipp Reisner if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) { 2471b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2472b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2473b411b363SPhilipp Reisner int forced = (hg == -100); 2474b411b363SPhilipp Reisner 2475b411b363SPhilipp Reisner switch (pcount) { 2476b411b363SPhilipp Reisner case 0: 2477b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2478b411b363SPhilipp Reisner break; 2479b411b363SPhilipp Reisner case 1: 2480b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2481b411b363SPhilipp Reisner break; 2482b411b363SPhilipp Reisner case 2: 2483b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2484b411b363SPhilipp Reisner break; 2485b411b363SPhilipp Reisner } 2486b411b363SPhilipp Reisner if (abs(hg) < 100) { 2487b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2488b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2489b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2490b411b363SPhilipp Reisner if (forced) { 2491b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2492b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2493b411b363SPhilipp Reisner hg = hg*2; 2494b411b363SPhilipp Reisner } 2495b411b363SPhilipp Reisner } 2496b411b363SPhilipp Reisner } 2497b411b363SPhilipp Reisner 2498b411b363SPhilipp Reisner if (hg == -100) { 2499b411b363SPhilipp Reisner if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2500b411b363SPhilipp Reisner hg = -1; 2501b411b363SPhilipp Reisner if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2502b411b363SPhilipp Reisner hg = 1; 2503b411b363SPhilipp Reisner 2504b411b363SPhilipp Reisner if (abs(hg) < 100) 2505b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2506b411b363SPhilipp Reisner "Sync from %s node\n", 2507b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2508b411b363SPhilipp Reisner } 2509b411b363SPhilipp Reisner 2510b411b363SPhilipp Reisner if (hg == -100) { 2511b411b363SPhilipp Reisner dev_alert(DEV, "Split-Brain detected, dropping connection!\n"); 2512b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2513b411b363SPhilipp Reisner return C_MASK; 2514b411b363SPhilipp Reisner } 2515b411b363SPhilipp Reisner 2516b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2517b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2518b411b363SPhilipp Reisner return C_MASK; 2519b411b363SPhilipp Reisner } 2520b411b363SPhilipp Reisner 2521b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2522b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 2523b411b363SPhilipp Reisner switch (mdev->net_conf->rr_conflict) { 2524b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2525b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2526b411b363SPhilipp Reisner /* fall through */ 2527b411b363SPhilipp Reisner case ASB_DISCONNECT: 2528b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2529b411b363SPhilipp Reisner return C_MASK; 2530b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2531b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2532b411b363SPhilipp Reisner "assumption\n"); 2533b411b363SPhilipp Reisner } 2534b411b363SPhilipp Reisner } 2535b411b363SPhilipp Reisner 2536b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2537b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 2538b411b363SPhilipp Reisner if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake")) 2539b411b363SPhilipp Reisner return C_MASK; 2540b411b363SPhilipp Reisner } 2541b411b363SPhilipp Reisner 2542b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2543b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2544b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2545b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2546b411b363SPhilipp Reisner } else { 2547b411b363SPhilipp Reisner rv = C_CONNECTED; 2548b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2549b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2550b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2551b411b363SPhilipp Reisner } 2552b411b363SPhilipp Reisner } 2553b411b363SPhilipp Reisner 2554b411b363SPhilipp Reisner return rv; 2555b411b363SPhilipp Reisner } 2556b411b363SPhilipp Reisner 2557b411b363SPhilipp Reisner /* returns 1 if invalid */ 2558b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2559b411b363SPhilipp Reisner { 2560b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2561b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2562b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2563b411b363SPhilipp Reisner return 0; 2564b411b363SPhilipp Reisner 2565b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2566b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2567b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2568b411b363SPhilipp Reisner return 1; 2569b411b363SPhilipp Reisner 2570b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2571b411b363SPhilipp Reisner if (peer == self) 2572b411b363SPhilipp Reisner return 0; 2573b411b363SPhilipp Reisner 2574b411b363SPhilipp Reisner /* everything es is invalid. */ 2575b411b363SPhilipp Reisner return 1; 2576b411b363SPhilipp Reisner } 2577b411b363SPhilipp Reisner 2578b411b363SPhilipp Reisner static int receive_protocol(struct drbd_conf *mdev, struct p_header *h) 2579b411b363SPhilipp Reisner { 2580b411b363SPhilipp Reisner struct p_protocol *p = (struct p_protocol *)h; 2581b411b363SPhilipp Reisner int header_size, data_size; 2582b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2583b411b363SPhilipp Reisner int p_want_lose, p_two_primaries; 2584b411b363SPhilipp Reisner char p_integrity_alg[SHARED_SECRET_MAX] = ""; 2585b411b363SPhilipp Reisner 2586b411b363SPhilipp Reisner header_size = sizeof(*p) - sizeof(*h); 2587b411b363SPhilipp Reisner data_size = h->length - header_size; 2588b411b363SPhilipp Reisner 2589b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, header_size) != header_size) 2590b411b363SPhilipp Reisner return FALSE; 2591b411b363SPhilipp Reisner 2592b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2593b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 2594b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 2595b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 2596b411b363SPhilipp Reisner p_want_lose = be32_to_cpu(p->want_lose); 2597b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 2598b411b363SPhilipp Reisner 2599b411b363SPhilipp Reisner if (p_proto != mdev->net_conf->wire_protocol) { 2600b411b363SPhilipp Reisner dev_err(DEV, "incompatible communication protocols\n"); 2601b411b363SPhilipp Reisner goto disconnect; 2602b411b363SPhilipp Reisner } 2603b411b363SPhilipp Reisner 2604b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) { 2605b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-0pri settings\n"); 2606b411b363SPhilipp Reisner goto disconnect; 2607b411b363SPhilipp Reisner } 2608b411b363SPhilipp Reisner 2609b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) { 2610b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-1pri settings\n"); 2611b411b363SPhilipp Reisner goto disconnect; 2612b411b363SPhilipp Reisner } 2613b411b363SPhilipp Reisner 2614b411b363SPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) { 2615b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-2pri settings\n"); 2616b411b363SPhilipp Reisner goto disconnect; 2617b411b363SPhilipp Reisner } 2618b411b363SPhilipp Reisner 2619b411b363SPhilipp Reisner if (p_want_lose && mdev->net_conf->want_lose) { 2620b411b363SPhilipp Reisner dev_err(DEV, "both sides have the 'want_lose' flag set\n"); 2621b411b363SPhilipp Reisner goto disconnect; 2622b411b363SPhilipp Reisner } 2623b411b363SPhilipp Reisner 2624b411b363SPhilipp Reisner if (p_two_primaries != mdev->net_conf->two_primaries) { 2625b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the two-primaries options\n"); 2626b411b363SPhilipp Reisner goto disconnect; 2627b411b363SPhilipp Reisner } 2628b411b363SPhilipp Reisner 2629b411b363SPhilipp Reisner if (mdev->agreed_pro_version >= 87) { 2630b411b363SPhilipp Reisner unsigned char *my_alg = mdev->net_conf->integrity_alg; 2631b411b363SPhilipp Reisner 2632b411b363SPhilipp Reisner if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) 2633b411b363SPhilipp Reisner return FALSE; 2634b411b363SPhilipp Reisner 2635b411b363SPhilipp Reisner p_integrity_alg[SHARED_SECRET_MAX-1] = 0; 2636b411b363SPhilipp Reisner if (strcmp(p_integrity_alg, my_alg)) { 2637b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); 2638b411b363SPhilipp Reisner goto disconnect; 2639b411b363SPhilipp Reisner } 2640b411b363SPhilipp Reisner dev_info(DEV, "data-integrity-alg: %s\n", 2641b411b363SPhilipp Reisner my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); 2642b411b363SPhilipp Reisner } 2643b411b363SPhilipp Reisner 2644b411b363SPhilipp Reisner return TRUE; 2645b411b363SPhilipp Reisner 2646b411b363SPhilipp Reisner disconnect: 2647b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2648b411b363SPhilipp Reisner return FALSE; 2649b411b363SPhilipp Reisner } 2650b411b363SPhilipp Reisner 2651b411b363SPhilipp Reisner /* helper function 2652b411b363SPhilipp Reisner * input: alg name, feature name 2653b411b363SPhilipp Reisner * return: NULL (alg name was "") 2654b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 2655b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 2656b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 2657b411b363SPhilipp Reisner const char *alg, const char *name) 2658b411b363SPhilipp Reisner { 2659b411b363SPhilipp Reisner struct crypto_hash *tfm; 2660b411b363SPhilipp Reisner 2661b411b363SPhilipp Reisner if (!alg[0]) 2662b411b363SPhilipp Reisner return NULL; 2663b411b363SPhilipp Reisner 2664b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 2665b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 2666b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 2667b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 2668b411b363SPhilipp Reisner return tfm; 2669b411b363SPhilipp Reisner } 2670b411b363SPhilipp Reisner if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 2671b411b363SPhilipp Reisner crypto_free_hash(tfm); 2672b411b363SPhilipp Reisner dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); 2673b411b363SPhilipp Reisner return ERR_PTR(-EINVAL); 2674b411b363SPhilipp Reisner } 2675b411b363SPhilipp Reisner return tfm; 2676b411b363SPhilipp Reisner } 2677b411b363SPhilipp Reisner 2678b411b363SPhilipp Reisner static int receive_SyncParam(struct drbd_conf *mdev, struct p_header *h) 2679b411b363SPhilipp Reisner { 2680b411b363SPhilipp Reisner int ok = TRUE; 2681b411b363SPhilipp Reisner struct p_rs_param_89 *p = (struct p_rs_param_89 *)h; 2682b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 2683b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 2684b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 2685b411b363SPhilipp Reisner const int apv = mdev->agreed_pro_version; 2686b411b363SPhilipp Reisner 2687b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 2688b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 2689b411b363SPhilipp Reisner + SHARED_SECRET_MAX 2690b411b363SPhilipp Reisner : /* 89 */ sizeof(struct p_rs_param_89); 2691b411b363SPhilipp Reisner 2692b411b363SPhilipp Reisner if (h->length > exp_max_sz) { 2693b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 2694b411b363SPhilipp Reisner h->length, exp_max_sz); 2695b411b363SPhilipp Reisner return FALSE; 2696b411b363SPhilipp Reisner } 2697b411b363SPhilipp Reisner 2698b411b363SPhilipp Reisner if (apv <= 88) { 2699b411b363SPhilipp Reisner header_size = sizeof(struct p_rs_param) - sizeof(*h); 2700b411b363SPhilipp Reisner data_size = h->length - header_size; 2701b411b363SPhilipp Reisner } else /* apv >= 89 */ { 2702b411b363SPhilipp Reisner header_size = sizeof(struct p_rs_param_89) - sizeof(*h); 2703b411b363SPhilipp Reisner data_size = h->length - header_size; 2704b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 2705b411b363SPhilipp Reisner } 2706b411b363SPhilipp Reisner 2707b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 2708b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 2709b411b363SPhilipp Reisner 2710b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, header_size) != header_size) 2711b411b363SPhilipp Reisner return FALSE; 2712b411b363SPhilipp Reisner 2713b411b363SPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 2714b411b363SPhilipp Reisner 2715b411b363SPhilipp Reisner if (apv >= 88) { 2716b411b363SPhilipp Reisner if (apv == 88) { 2717b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 2718b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 2719b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 2720b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 2721b411b363SPhilipp Reisner return FALSE; 2722b411b363SPhilipp Reisner } 2723b411b363SPhilipp Reisner 2724b411b363SPhilipp Reisner if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) 2725b411b363SPhilipp Reisner return FALSE; 2726b411b363SPhilipp Reisner 2727b411b363SPhilipp Reisner /* we expect NUL terminated string */ 2728b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2729b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 2730b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 2731b411b363SPhilipp Reisner 2732b411b363SPhilipp Reisner } else /* apv >= 89 */ { 2733b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 2734b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2735b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 2736b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 2737b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 2738b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 2739b411b363SPhilipp Reisner } 2740b411b363SPhilipp Reisner 2741b411b363SPhilipp Reisner if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { 2742b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2743b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 2744b411b363SPhilipp Reisner mdev->sync_conf.verify_alg, p->verify_alg); 2745b411b363SPhilipp Reisner goto disconnect; 2746b411b363SPhilipp Reisner } 2747b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 2748b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 2749b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 2750b411b363SPhilipp Reisner verify_tfm = NULL; 2751b411b363SPhilipp Reisner goto disconnect; 2752b411b363SPhilipp Reisner } 2753b411b363SPhilipp Reisner } 2754b411b363SPhilipp Reisner 2755b411b363SPhilipp Reisner if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { 2756b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2757b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 2758b411b363SPhilipp Reisner mdev->sync_conf.csums_alg, p->csums_alg); 2759b411b363SPhilipp Reisner goto disconnect; 2760b411b363SPhilipp Reisner } 2761b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 2762b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 2763b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 2764b411b363SPhilipp Reisner csums_tfm = NULL; 2765b411b363SPhilipp Reisner goto disconnect; 2766b411b363SPhilipp Reisner } 2767b411b363SPhilipp Reisner } 2768b411b363SPhilipp Reisner 2769b411b363SPhilipp Reisner 2770b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 2771b411b363SPhilipp Reisner /* lock against drbd_nl_syncer_conf() */ 2772b411b363SPhilipp Reisner if (verify_tfm) { 2773b411b363SPhilipp Reisner strcpy(mdev->sync_conf.verify_alg, p->verify_alg); 2774b411b363SPhilipp Reisner mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; 2775b411b363SPhilipp Reisner crypto_free_hash(mdev->verify_tfm); 2776b411b363SPhilipp Reisner mdev->verify_tfm = verify_tfm; 2777b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 2778b411b363SPhilipp Reisner } 2779b411b363SPhilipp Reisner if (csums_tfm) { 2780b411b363SPhilipp Reisner strcpy(mdev->sync_conf.csums_alg, p->csums_alg); 2781b411b363SPhilipp Reisner mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; 2782b411b363SPhilipp Reisner crypto_free_hash(mdev->csums_tfm); 2783b411b363SPhilipp Reisner mdev->csums_tfm = csums_tfm; 2784b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 2785b411b363SPhilipp Reisner } 2786b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 2787b411b363SPhilipp Reisner } 2788b411b363SPhilipp Reisner 2789b411b363SPhilipp Reisner return ok; 2790b411b363SPhilipp Reisner disconnect: 2791b411b363SPhilipp Reisner /* just for completeness: actually not needed, 2792b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 2793b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 2794b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 2795b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 2796b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2797b411b363SPhilipp Reisner return FALSE; 2798b411b363SPhilipp Reisner } 2799b411b363SPhilipp Reisner 2800b411b363SPhilipp Reisner static void drbd_setup_order_type(struct drbd_conf *mdev, int peer) 2801b411b363SPhilipp Reisner { 2802b411b363SPhilipp Reisner /* sorry, we currently have no working implementation 2803b411b363SPhilipp Reisner * of distributed TCQ */ 2804b411b363SPhilipp Reisner } 2805b411b363SPhilipp Reisner 2806b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 2807b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 2808b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 2809b411b363SPhilipp Reisner { 2810b411b363SPhilipp Reisner sector_t d; 2811b411b363SPhilipp Reisner if (a == 0 || b == 0) 2812b411b363SPhilipp Reisner return; 2813b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 2814b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 2815b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 2816b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 2817b411b363SPhilipp Reisner } 2818b411b363SPhilipp Reisner 2819b411b363SPhilipp Reisner static int receive_sizes(struct drbd_conf *mdev, struct p_header *h) 2820b411b363SPhilipp Reisner { 2821b411b363SPhilipp Reisner struct p_sizes *p = (struct p_sizes *)h; 2822b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 2823b411b363SPhilipp Reisner unsigned int max_seg_s; 2824b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 2825b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 2826b411b363SPhilipp Reisner enum drbd_conns nconn; 2827b411b363SPhilipp Reisner 2828b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; 2829b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, h->length) != h->length) 2830b411b363SPhilipp Reisner return FALSE; 2831b411b363SPhilipp Reisner 2832b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 2833b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 2834b411b363SPhilipp Reisner 2835b411b363SPhilipp Reisner if (p_size == 0 && mdev->state.disk == D_DISKLESS) { 2836b411b363SPhilipp Reisner dev_err(DEV, "some backing storage is needed\n"); 2837b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2838b411b363SPhilipp Reisner return FALSE; 2839b411b363SPhilipp Reisner } 2840b411b363SPhilipp Reisner 2841b411b363SPhilipp Reisner /* just store the peer's disk size for now. 2842b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 2843b411b363SPhilipp Reisner mdev->p_size = p_size; 2844b411b363SPhilipp Reisner 2845b411b363SPhilipp Reisner #define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r)) 2846b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2847b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 2848b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 2849b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 2850b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 2851b411b363SPhilipp Reisner 2852b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 2853b411b363SPhilipp Reisner * param exchange, choose the minimum */ 2854b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 2855b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 2856b411b363SPhilipp Reisner p_usize); 2857b411b363SPhilipp Reisner 2858b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 2859b411b363SPhilipp Reisner 2860b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 2861b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 2862b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 2863b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 2864b411b363SPhilipp Reisner } 2865b411b363SPhilipp Reisner 2866b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 2867b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 2868b411b363SPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev) < 2869b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 2870b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 2871b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 2872b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 2873b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2874b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 2875b411b363SPhilipp Reisner put_ldev(mdev); 2876b411b363SPhilipp Reisner return FALSE; 2877b411b363SPhilipp Reisner } 2878b411b363SPhilipp Reisner put_ldev(mdev); 2879b411b363SPhilipp Reisner } 2880b411b363SPhilipp Reisner #undef min_not_zero 2881b411b363SPhilipp Reisner 2882b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2883b411b363SPhilipp Reisner dd = drbd_determin_dev_size(mdev); 2884b411b363SPhilipp Reisner put_ldev(mdev); 2885b411b363SPhilipp Reisner if (dd == dev_size_error) 2886b411b363SPhilipp Reisner return FALSE; 2887b411b363SPhilipp Reisner drbd_md_sync(mdev); 2888b411b363SPhilipp Reisner } else { 2889b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 2890b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 2891b411b363SPhilipp Reisner } 2892b411b363SPhilipp Reisner 2893b411b363SPhilipp Reisner if (mdev->p_uuid && mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) { 2894b411b363SPhilipp Reisner nconn = drbd_sync_handshake(mdev, 2895b411b363SPhilipp Reisner mdev->state.peer, mdev->state.pdsk); 2896b411b363SPhilipp Reisner put_ldev(mdev); 2897b411b363SPhilipp Reisner 2898b411b363SPhilipp Reisner if (nconn == C_MASK) { 2899b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2900b411b363SPhilipp Reisner return FALSE; 2901b411b363SPhilipp Reisner } 2902b411b363SPhilipp Reisner 2903b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, nconn)) < SS_SUCCESS) { 2904b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2905b411b363SPhilipp Reisner return FALSE; 2906b411b363SPhilipp Reisner } 2907b411b363SPhilipp Reisner } 2908b411b363SPhilipp Reisner 2909b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2910b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 2911b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 2912b411b363SPhilipp Reisner ldsc = 1; 2913b411b363SPhilipp Reisner } 2914b411b363SPhilipp Reisner 2915b411b363SPhilipp Reisner max_seg_s = be32_to_cpu(p->max_segment_size); 2916b411b363SPhilipp Reisner if (max_seg_s != queue_max_segment_size(mdev->rq_queue)) 2917b411b363SPhilipp Reisner drbd_setup_queue_param(mdev, max_seg_s); 2918b411b363SPhilipp Reisner 2919b411b363SPhilipp Reisner drbd_setup_order_type(mdev, be32_to_cpu(p->queue_order_type)); 2920b411b363SPhilipp Reisner put_ldev(mdev); 2921b411b363SPhilipp Reisner } 2922b411b363SPhilipp Reisner 2923b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 2924b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 2925b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 2926b411b363SPhilipp Reisner /* we have different sizes, probably peer 2927b411b363SPhilipp Reisner * needs to know my new size... */ 2928b411b363SPhilipp Reisner drbd_send_sizes(mdev, 0); 2929b411b363SPhilipp Reisner } 2930b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 2931b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 2932b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 2933b411b363SPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) 2934b411b363SPhilipp Reisner resync_after_online_grow(mdev); 2935b411b363SPhilipp Reisner else 2936b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 2937b411b363SPhilipp Reisner } 2938b411b363SPhilipp Reisner } 2939b411b363SPhilipp Reisner 2940b411b363SPhilipp Reisner return TRUE; 2941b411b363SPhilipp Reisner } 2942b411b363SPhilipp Reisner 2943b411b363SPhilipp Reisner static int receive_uuids(struct drbd_conf *mdev, struct p_header *h) 2944b411b363SPhilipp Reisner { 2945b411b363SPhilipp Reisner struct p_uuids *p = (struct p_uuids *)h; 2946b411b363SPhilipp Reisner u64 *p_uuid; 2947b411b363SPhilipp Reisner int i; 2948b411b363SPhilipp Reisner 2949b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; 2950b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, h->length) != h->length) 2951b411b363SPhilipp Reisner return FALSE; 2952b411b363SPhilipp Reisner 2953b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 2954b411b363SPhilipp Reisner 2955b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 2956b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 2957b411b363SPhilipp Reisner 2958b411b363SPhilipp Reisner kfree(mdev->p_uuid); 2959b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 2960b411b363SPhilipp Reisner 2961b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 2962b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 2963b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 2964b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 2965b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 2966b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 2967b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 2968b411b363SPhilipp Reisner return FALSE; 2969b411b363SPhilipp Reisner } 2970b411b363SPhilipp Reisner 2971b411b363SPhilipp Reisner if (get_ldev(mdev)) { 2972b411b363SPhilipp Reisner int skip_initial_sync = 2973b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 2974b411b363SPhilipp Reisner mdev->agreed_pro_version >= 90 && 2975b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 2976b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 2977b411b363SPhilipp Reisner if (skip_initial_sync) { 2978b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 2979b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 2980b411b363SPhilipp Reisner "clear_n_write from receive_uuids"); 2981b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 2982b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 2983b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 2984b411b363SPhilipp Reisner CS_VERBOSE, NULL); 2985b411b363SPhilipp Reisner drbd_md_sync(mdev); 2986b411b363SPhilipp Reisner } 2987b411b363SPhilipp Reisner put_ldev(mdev); 2988b411b363SPhilipp Reisner } 2989b411b363SPhilipp Reisner 2990b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 2991b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 2992b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 2993b411b363SPhilipp Reisner new disk state... */ 2994b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); 2995b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 2996b411b363SPhilipp Reisner drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 2997b411b363SPhilipp Reisner 2998b411b363SPhilipp Reisner return TRUE; 2999b411b363SPhilipp Reisner } 3000b411b363SPhilipp Reisner 3001b411b363SPhilipp Reisner /** 3002b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3003b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3004b411b363SPhilipp Reisner */ 3005b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3006b411b363SPhilipp Reisner { 3007b411b363SPhilipp Reisner union drbd_state ms; 3008b411b363SPhilipp Reisner 3009b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3010b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3011b411b363SPhilipp Reisner 3012b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3013b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3014b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3015b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3016b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3017b411b363SPhilipp Reisner }; 3018b411b363SPhilipp Reisner 3019b411b363SPhilipp Reisner ms.i = ps.i; 3020b411b363SPhilipp Reisner 3021b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3022b411b363SPhilipp Reisner ms.peer = ps.role; 3023b411b363SPhilipp Reisner ms.role = ps.peer; 3024b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3025b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3026b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3027b411b363SPhilipp Reisner 3028b411b363SPhilipp Reisner return ms; 3029b411b363SPhilipp Reisner } 3030b411b363SPhilipp Reisner 3031b411b363SPhilipp Reisner static int receive_req_state(struct drbd_conf *mdev, struct p_header *h) 3032b411b363SPhilipp Reisner { 3033b411b363SPhilipp Reisner struct p_req_state *p = (struct p_req_state *)h; 3034b411b363SPhilipp Reisner union drbd_state mask, val; 3035b411b363SPhilipp Reisner int rv; 3036b411b363SPhilipp Reisner 3037b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; 3038b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, h->length) != h->length) 3039b411b363SPhilipp Reisner return FALSE; 3040b411b363SPhilipp Reisner 3041b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3042b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3043b411b363SPhilipp Reisner 3044b411b363SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->flags) && 3045b411b363SPhilipp Reisner test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { 3046b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 3047b411b363SPhilipp Reisner return TRUE; 3048b411b363SPhilipp Reisner } 3049b411b363SPhilipp Reisner 3050b411b363SPhilipp Reisner mask = convert_state(mask); 3051b411b363SPhilipp Reisner val = convert_state(val); 3052b411b363SPhilipp Reisner 3053b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3054b411b363SPhilipp Reisner 3055b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3056b411b363SPhilipp Reisner drbd_md_sync(mdev); 3057b411b363SPhilipp Reisner 3058b411b363SPhilipp Reisner return TRUE; 3059b411b363SPhilipp Reisner } 3060b411b363SPhilipp Reisner 3061b411b363SPhilipp Reisner static int receive_state(struct drbd_conf *mdev, struct p_header *h) 3062b411b363SPhilipp Reisner { 3063b411b363SPhilipp Reisner struct p_state *p = (struct p_state *)h; 3064b411b363SPhilipp Reisner enum drbd_conns nconn, oconn; 3065b411b363SPhilipp Reisner union drbd_state ns, peer_state; 3066b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 3067b411b363SPhilipp Reisner int rv; 3068b411b363SPhilipp Reisner 3069b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) 3070b411b363SPhilipp Reisner return FALSE; 3071b411b363SPhilipp Reisner 3072b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, h->length) != h->length) 3073b411b363SPhilipp Reisner return FALSE; 3074b411b363SPhilipp Reisner 3075b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3076b411b363SPhilipp Reisner 3077b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3078b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3079b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3080b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3081b411b363SPhilipp Reisner } 3082b411b363SPhilipp Reisner 3083b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3084b411b363SPhilipp Reisner retry: 3085b411b363SPhilipp Reisner oconn = nconn = mdev->state.conn; 3086b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3087b411b363SPhilipp Reisner 3088b411b363SPhilipp Reisner if (nconn == C_WF_REPORT_PARAMS) 3089b411b363SPhilipp Reisner nconn = C_CONNECTED; 3090b411b363SPhilipp Reisner 3091b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3092b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3093b411b363SPhilipp Reisner int cr; /* consider resync */ 3094b411b363SPhilipp Reisner 3095b411b363SPhilipp Reisner /* if we established a new connection */ 3096b411b363SPhilipp Reisner cr = (oconn < C_CONNECTED); 3097b411b363SPhilipp Reisner /* if we had an established connection 3098b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 3099b411b363SPhilipp Reisner cr |= (oconn == C_CONNECTED && 3100b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 3101b411b363SPhilipp Reisner mdev->state.disk == D_NEGOTIATING)); 3102b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3103b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3104b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3105b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3106b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 3107b411b363SPhilipp Reisner cr |= (oconn == C_CONNECTED && 3108b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3109b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3110b411b363SPhilipp Reisner 3111b411b363SPhilipp Reisner if (cr) 3112b411b363SPhilipp Reisner nconn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3113b411b363SPhilipp Reisner 3114b411b363SPhilipp Reisner put_ldev(mdev); 3115b411b363SPhilipp Reisner if (nconn == C_MASK) { 3116b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 3117b411b363SPhilipp Reisner drbd_force_state(mdev, NS(disk, D_DISKLESS)); 3118b411b363SPhilipp Reisner nconn = C_CONNECTED; 3119b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3120b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3121b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3122b411b363SPhilipp Reisner } else { 3123b411b363SPhilipp Reisner D_ASSERT(oconn == C_WF_REPORT_PARAMS); 3124b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3125b411b363SPhilipp Reisner return FALSE; 3126b411b363SPhilipp Reisner } 3127b411b363SPhilipp Reisner } 3128b411b363SPhilipp Reisner } 3129b411b363SPhilipp Reisner 3130b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3131b411b363SPhilipp Reisner if (mdev->state.conn != oconn) 3132b411b363SPhilipp Reisner goto retry; 3133b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3134b411b363SPhilipp Reisner ns.i = mdev->state.i; 3135b411b363SPhilipp Reisner ns.conn = nconn; 3136b411b363SPhilipp Reisner ns.peer = peer_state.role; 3137b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3138b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 3139b411b363SPhilipp Reisner if ((nconn == C_CONNECTED || nconn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3140b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 3141b411b363SPhilipp Reisner 3142b411b363SPhilipp Reisner rv = _drbd_set_state(mdev, ns, CS_VERBOSE | CS_HARD, NULL); 3143b411b363SPhilipp Reisner ns = mdev->state; 3144b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3145b411b363SPhilipp Reisner 3146b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 3147b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3148b411b363SPhilipp Reisner return FALSE; 3149b411b363SPhilipp Reisner } 3150b411b363SPhilipp Reisner 3151b411b363SPhilipp Reisner if (oconn > C_WF_REPORT_PARAMS) { 3152b411b363SPhilipp Reisner if (nconn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3153b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3154b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3155b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3156b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3157b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3158b411b363SPhilipp Reisner drbd_send_state(mdev); 3159b411b363SPhilipp Reisner } 3160b411b363SPhilipp Reisner } 3161b411b363SPhilipp Reisner 3162b411b363SPhilipp Reisner mdev->net_conf->want_lose = 0; 3163b411b363SPhilipp Reisner 3164b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3165b411b363SPhilipp Reisner 3166b411b363SPhilipp Reisner return TRUE; 3167b411b363SPhilipp Reisner } 3168b411b363SPhilipp Reisner 3169b411b363SPhilipp Reisner static int receive_sync_uuid(struct drbd_conf *mdev, struct p_header *h) 3170b411b363SPhilipp Reisner { 3171b411b363SPhilipp Reisner struct p_rs_uuid *p = (struct p_rs_uuid *)h; 3172b411b363SPhilipp Reisner 3173b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3174b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3175b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3176b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3177b411b363SPhilipp Reisner 3178b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3179b411b363SPhilipp Reisner 3180b411b363SPhilipp Reisner ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; 3181b411b363SPhilipp Reisner if (drbd_recv(mdev, h->payload, h->length) != h->length) 3182b411b363SPhilipp Reisner return FALSE; 3183b411b363SPhilipp Reisner 3184b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3185b411b363SPhilipp Reisner _not_ be rotated into the history */ 3186b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3187b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3188b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3189b411b363SPhilipp Reisner 3190b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3191b411b363SPhilipp Reisner 3192b411b363SPhilipp Reisner put_ldev(mdev); 3193b411b363SPhilipp Reisner } else 3194b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3195b411b363SPhilipp Reisner 3196b411b363SPhilipp Reisner return TRUE; 3197b411b363SPhilipp Reisner } 3198b411b363SPhilipp Reisner 3199b411b363SPhilipp Reisner enum receive_bitmap_ret { OK, DONE, FAILED }; 3200b411b363SPhilipp Reisner 3201b411b363SPhilipp Reisner static enum receive_bitmap_ret 3202b411b363SPhilipp Reisner receive_bitmap_plain(struct drbd_conf *mdev, struct p_header *h, 3203b411b363SPhilipp Reisner unsigned long *buffer, struct bm_xfer_ctx *c) 3204b411b363SPhilipp Reisner { 3205b411b363SPhilipp Reisner unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); 3206b411b363SPhilipp Reisner unsigned want = num_words * sizeof(long); 3207b411b363SPhilipp Reisner 3208b411b363SPhilipp Reisner if (want != h->length) { 3209b411b363SPhilipp Reisner dev_err(DEV, "%s:want (%u) != h->length (%u)\n", __func__, want, h->length); 3210b411b363SPhilipp Reisner return FAILED; 3211b411b363SPhilipp Reisner } 3212b411b363SPhilipp Reisner if (want == 0) 3213b411b363SPhilipp Reisner return DONE; 3214b411b363SPhilipp Reisner if (drbd_recv(mdev, buffer, want) != want) 3215b411b363SPhilipp Reisner return FAILED; 3216b411b363SPhilipp Reisner 3217b411b363SPhilipp Reisner drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); 3218b411b363SPhilipp Reisner 3219b411b363SPhilipp Reisner c->word_offset += num_words; 3220b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3221b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3222b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3223b411b363SPhilipp Reisner 3224b411b363SPhilipp Reisner return OK; 3225b411b363SPhilipp Reisner } 3226b411b363SPhilipp Reisner 3227b411b363SPhilipp Reisner static enum receive_bitmap_ret 3228b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3229b411b363SPhilipp Reisner struct p_compressed_bm *p, 3230b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3231b411b363SPhilipp Reisner { 3232b411b363SPhilipp Reisner struct bitstream bs; 3233b411b363SPhilipp Reisner u64 look_ahead; 3234b411b363SPhilipp Reisner u64 rl; 3235b411b363SPhilipp Reisner u64 tmp; 3236b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3237b411b363SPhilipp Reisner unsigned long e; 3238b411b363SPhilipp Reisner int len = p->head.length - (sizeof(*p) - sizeof(p->head)); 3239b411b363SPhilipp Reisner int toggle = DCBP_get_start(p); 3240b411b363SPhilipp Reisner int have; 3241b411b363SPhilipp Reisner int bits; 3242b411b363SPhilipp Reisner 3243b411b363SPhilipp Reisner bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); 3244b411b363SPhilipp Reisner 3245b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3246b411b363SPhilipp Reisner if (bits < 0) 3247b411b363SPhilipp Reisner return FAILED; 3248b411b363SPhilipp Reisner 3249b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3250b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3251b411b363SPhilipp Reisner if (bits <= 0) 3252b411b363SPhilipp Reisner return FAILED; 3253b411b363SPhilipp Reisner 3254b411b363SPhilipp Reisner if (toggle) { 3255b411b363SPhilipp Reisner e = s + rl -1; 3256b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3257b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 3258b411b363SPhilipp Reisner return FAILED; 3259b411b363SPhilipp Reisner } 3260b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3261b411b363SPhilipp Reisner } 3262b411b363SPhilipp Reisner 3263b411b363SPhilipp Reisner if (have < bits) { 3264b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3265b411b363SPhilipp Reisner have, bits, look_ahead, 3266b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3267b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 3268b411b363SPhilipp Reisner return FAILED; 3269b411b363SPhilipp Reisner } 3270b411b363SPhilipp Reisner look_ahead >>= bits; 3271b411b363SPhilipp Reisner have -= bits; 3272b411b363SPhilipp Reisner 3273b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3274b411b363SPhilipp Reisner if (bits < 0) 3275b411b363SPhilipp Reisner return FAILED; 3276b411b363SPhilipp Reisner look_ahead |= tmp << have; 3277b411b363SPhilipp Reisner have += bits; 3278b411b363SPhilipp Reisner } 3279b411b363SPhilipp Reisner 3280b411b363SPhilipp Reisner c->bit_offset = s; 3281b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3282b411b363SPhilipp Reisner 3283b411b363SPhilipp Reisner return (s == c->bm_bits) ? DONE : OK; 3284b411b363SPhilipp Reisner } 3285b411b363SPhilipp Reisner 3286b411b363SPhilipp Reisner static enum receive_bitmap_ret 3287b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3288b411b363SPhilipp Reisner struct p_compressed_bm *p, 3289b411b363SPhilipp Reisner struct bm_xfer_ctx *c) 3290b411b363SPhilipp Reisner { 3291b411b363SPhilipp Reisner if (DCBP_get_code(p) == RLE_VLI_Bits) 3292b411b363SPhilipp Reisner return recv_bm_rle_bits(mdev, p, c); 3293b411b363SPhilipp Reisner 3294b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3295b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3296b411b363SPhilipp Reisner * during all our tests. */ 3297b411b363SPhilipp Reisner 3298b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 3299b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3300b411b363SPhilipp Reisner return FAILED; 3301b411b363SPhilipp Reisner } 3302b411b363SPhilipp Reisner 3303b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3304b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3305b411b363SPhilipp Reisner { 3306b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 3307b411b363SPhilipp Reisner unsigned plain = sizeof(struct p_header) * 3308b411b363SPhilipp Reisner ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) 3309b411b363SPhilipp Reisner + c->bm_words * sizeof(long); 3310b411b363SPhilipp Reisner unsigned total = c->bytes[0] + c->bytes[1]; 3311b411b363SPhilipp Reisner unsigned r; 3312b411b363SPhilipp Reisner 3313b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3314b411b363SPhilipp Reisner if (total == 0) 3315b411b363SPhilipp Reisner return; 3316b411b363SPhilipp Reisner 3317b411b363SPhilipp Reisner /* don't report if not compressed */ 3318b411b363SPhilipp Reisner if (total >= plain) 3319b411b363SPhilipp Reisner return; 3320b411b363SPhilipp Reisner 3321b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3322b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3323b411b363SPhilipp Reisner : (1000 * total / plain); 3324b411b363SPhilipp Reisner 3325b411b363SPhilipp Reisner if (r > 1000) 3326b411b363SPhilipp Reisner r = 1000; 3327b411b363SPhilipp Reisner 3328b411b363SPhilipp Reisner r = 1000 - r; 3329b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3330b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3331b411b363SPhilipp Reisner direction, 3332b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3333b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3334b411b363SPhilipp Reisner total, r/10, r % 10); 3335b411b363SPhilipp Reisner } 3336b411b363SPhilipp Reisner 3337b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3338b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3339b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3340b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3341b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3342b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3343b411b363SPhilipp Reisner 3344b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 3345b411b363SPhilipp Reisner static int receive_bitmap(struct drbd_conf *mdev, struct p_header *h) 3346b411b363SPhilipp Reisner { 3347b411b363SPhilipp Reisner struct bm_xfer_ctx c; 3348b411b363SPhilipp Reisner void *buffer; 3349b411b363SPhilipp Reisner enum receive_bitmap_ret ret; 3350b411b363SPhilipp Reisner int ok = FALSE; 3351b411b363SPhilipp Reisner 3352b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); 3353b411b363SPhilipp Reisner 3354b411b363SPhilipp Reisner drbd_bm_lock(mdev, "receive bitmap"); 3355b411b363SPhilipp Reisner 3356b411b363SPhilipp Reisner /* maybe we should use some per thread scratch page, 3357b411b363SPhilipp Reisner * and allocate that during initial device creation? */ 3358b411b363SPhilipp Reisner buffer = (unsigned long *) __get_free_page(GFP_NOIO); 3359b411b363SPhilipp Reisner if (!buffer) { 3360b411b363SPhilipp Reisner dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); 3361b411b363SPhilipp Reisner goto out; 3362b411b363SPhilipp Reisner } 3363b411b363SPhilipp Reisner 3364b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3365b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3366b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3367b411b363SPhilipp Reisner }; 3368b411b363SPhilipp Reisner 3369b411b363SPhilipp Reisner do { 3370b411b363SPhilipp Reisner if (h->command == P_BITMAP) { 3371b411b363SPhilipp Reisner ret = receive_bitmap_plain(mdev, h, buffer, &c); 3372b411b363SPhilipp Reisner } else if (h->command == P_COMPRESSED_BITMAP) { 3373b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3374b411b363SPhilipp Reisner * and the feature is enabled! */ 3375b411b363SPhilipp Reisner struct p_compressed_bm *p; 3376b411b363SPhilipp Reisner 3377b411b363SPhilipp Reisner if (h->length > BM_PACKET_PAYLOAD_BYTES) { 3378b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 3379b411b363SPhilipp Reisner goto out; 3380b411b363SPhilipp Reisner } 3381b411b363SPhilipp Reisner /* use the page buff */ 3382b411b363SPhilipp Reisner p = buffer; 3383b411b363SPhilipp Reisner memcpy(p, h, sizeof(*h)); 3384b411b363SPhilipp Reisner if (drbd_recv(mdev, p->head.payload, h->length) != h->length) 3385b411b363SPhilipp Reisner goto out; 3386b411b363SPhilipp Reisner if (p->head.length <= (sizeof(*p) - sizeof(p->head))) { 3387b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", p->head.length); 3388b411b363SPhilipp Reisner return FAILED; 3389b411b363SPhilipp Reisner } 3390b411b363SPhilipp Reisner ret = decode_bitmap_c(mdev, p, &c); 3391b411b363SPhilipp Reisner } else { 3392b411b363SPhilipp Reisner dev_warn(DEV, "receive_bitmap: h->command neither ReportBitMap nor ReportCBitMap (is 0x%x)", h->command); 3393b411b363SPhilipp Reisner goto out; 3394b411b363SPhilipp Reisner } 3395b411b363SPhilipp Reisner 3396b411b363SPhilipp Reisner c.packets[h->command == P_BITMAP]++; 3397b411b363SPhilipp Reisner c.bytes[h->command == P_BITMAP] += sizeof(struct p_header) + h->length; 3398b411b363SPhilipp Reisner 3399b411b363SPhilipp Reisner if (ret != OK) 3400b411b363SPhilipp Reisner break; 3401b411b363SPhilipp Reisner 3402b411b363SPhilipp Reisner if (!drbd_recv_header(mdev, h)) 3403b411b363SPhilipp Reisner goto out; 3404b411b363SPhilipp Reisner } while (ret == OK); 3405b411b363SPhilipp Reisner if (ret == FAILED) 3406b411b363SPhilipp Reisner goto out; 3407b411b363SPhilipp Reisner 3408b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 3409b411b363SPhilipp Reisner 3410b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 3411b411b363SPhilipp Reisner ok = !drbd_send_bitmap(mdev); 3412b411b363SPhilipp Reisner if (!ok) 3413b411b363SPhilipp Reisner goto out; 3414b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 3415b411b363SPhilipp Reisner ok = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 3416b411b363SPhilipp Reisner D_ASSERT(ok == SS_SUCCESS); 3417b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 3418b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 3419b411b363SPhilipp Reisner * other threads may have noticed network errors */ 3420b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 3421b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3422b411b363SPhilipp Reisner } 3423b411b363SPhilipp Reisner 3424b411b363SPhilipp Reisner ok = TRUE; 3425b411b363SPhilipp Reisner out: 3426b411b363SPhilipp Reisner drbd_bm_unlock(mdev); 3427b411b363SPhilipp Reisner if (ok && mdev->state.conn == C_WF_BITMAP_S) 3428b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 3429b411b363SPhilipp Reisner free_page((unsigned long) buffer); 3430b411b363SPhilipp Reisner return ok; 3431b411b363SPhilipp Reisner } 3432b411b363SPhilipp Reisner 3433b411b363SPhilipp Reisner static int receive_skip(struct drbd_conf *mdev, struct p_header *h) 3434b411b363SPhilipp Reisner { 3435b411b363SPhilipp Reisner /* TODO zero copy sink :) */ 3436b411b363SPhilipp Reisner static char sink[128]; 3437b411b363SPhilipp Reisner int size, want, r; 3438b411b363SPhilipp Reisner 3439b411b363SPhilipp Reisner dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", 3440b411b363SPhilipp Reisner h->command, h->length); 3441b411b363SPhilipp Reisner 3442b411b363SPhilipp Reisner size = h->length; 3443b411b363SPhilipp Reisner while (size > 0) { 3444b411b363SPhilipp Reisner want = min_t(int, size, sizeof(sink)); 3445b411b363SPhilipp Reisner r = drbd_recv(mdev, sink, want); 3446b411b363SPhilipp Reisner ERR_IF(r <= 0) break; 3447b411b363SPhilipp Reisner size -= r; 3448b411b363SPhilipp Reisner } 3449b411b363SPhilipp Reisner return size == 0; 3450b411b363SPhilipp Reisner } 3451b411b363SPhilipp Reisner 3452b411b363SPhilipp Reisner static int receive_UnplugRemote(struct drbd_conf *mdev, struct p_header *h) 3453b411b363SPhilipp Reisner { 3454b411b363SPhilipp Reisner if (mdev->state.disk >= D_INCONSISTENT) 3455b411b363SPhilipp Reisner drbd_kick_lo(mdev); 3456b411b363SPhilipp Reisner 3457b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 3458b411b363SPhilipp Reisner * with the data requests being unplugged */ 3459b411b363SPhilipp Reisner drbd_tcp_quickack(mdev->data.socket); 3460b411b363SPhilipp Reisner 3461b411b363SPhilipp Reisner return TRUE; 3462b411b363SPhilipp Reisner } 3463b411b363SPhilipp Reisner 3464b411b363SPhilipp Reisner typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, struct p_header *); 3465b411b363SPhilipp Reisner 3466b411b363SPhilipp Reisner static drbd_cmd_handler_f drbd_default_handler[] = { 3467b411b363SPhilipp Reisner [P_DATA] = receive_Data, 3468b411b363SPhilipp Reisner [P_DATA_REPLY] = receive_DataReply, 3469b411b363SPhilipp Reisner [P_RS_DATA_REPLY] = receive_RSDataReply, 3470b411b363SPhilipp Reisner [P_BARRIER] = receive_Barrier, 3471b411b363SPhilipp Reisner [P_BITMAP] = receive_bitmap, 3472b411b363SPhilipp Reisner [P_COMPRESSED_BITMAP] = receive_bitmap, 3473b411b363SPhilipp Reisner [P_UNPLUG_REMOTE] = receive_UnplugRemote, 3474b411b363SPhilipp Reisner [P_DATA_REQUEST] = receive_DataRequest, 3475b411b363SPhilipp Reisner [P_RS_DATA_REQUEST] = receive_DataRequest, 3476b411b363SPhilipp Reisner [P_SYNC_PARAM] = receive_SyncParam, 3477b411b363SPhilipp Reisner [P_SYNC_PARAM89] = receive_SyncParam, 3478b411b363SPhilipp Reisner [P_PROTOCOL] = receive_protocol, 3479b411b363SPhilipp Reisner [P_UUIDS] = receive_uuids, 3480b411b363SPhilipp Reisner [P_SIZES] = receive_sizes, 3481b411b363SPhilipp Reisner [P_STATE] = receive_state, 3482b411b363SPhilipp Reisner [P_STATE_CHG_REQ] = receive_req_state, 3483b411b363SPhilipp Reisner [P_SYNC_UUID] = receive_sync_uuid, 3484b411b363SPhilipp Reisner [P_OV_REQUEST] = receive_DataRequest, 3485b411b363SPhilipp Reisner [P_OV_REPLY] = receive_DataRequest, 3486b411b363SPhilipp Reisner [P_CSUM_RS_REQUEST] = receive_DataRequest, 3487b411b363SPhilipp Reisner /* anything missing from this table is in 3488b411b363SPhilipp Reisner * the asender_tbl, see get_asender_cmd */ 3489b411b363SPhilipp Reisner [P_MAX_CMD] = NULL, 3490b411b363SPhilipp Reisner }; 3491b411b363SPhilipp Reisner 3492b411b363SPhilipp Reisner static drbd_cmd_handler_f *drbd_cmd_handler = drbd_default_handler; 3493b411b363SPhilipp Reisner static drbd_cmd_handler_f *drbd_opt_cmd_handler; 3494b411b363SPhilipp Reisner 3495b411b363SPhilipp Reisner static void drbdd(struct drbd_conf *mdev) 3496b411b363SPhilipp Reisner { 3497b411b363SPhilipp Reisner drbd_cmd_handler_f handler; 3498b411b363SPhilipp Reisner struct p_header *header = &mdev->data.rbuf.header; 3499b411b363SPhilipp Reisner 3500b411b363SPhilipp Reisner while (get_t_state(&mdev->receiver) == Running) { 3501b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 3502b411b363SPhilipp Reisner if (!drbd_recv_header(mdev, header)) 3503b411b363SPhilipp Reisner break; 3504b411b363SPhilipp Reisner 3505b411b363SPhilipp Reisner if (header->command < P_MAX_CMD) 3506b411b363SPhilipp Reisner handler = drbd_cmd_handler[header->command]; 3507b411b363SPhilipp Reisner else if (P_MAY_IGNORE < header->command 3508b411b363SPhilipp Reisner && header->command < P_MAX_OPT_CMD) 3509b411b363SPhilipp Reisner handler = drbd_opt_cmd_handler[header->command-P_MAY_IGNORE]; 3510b411b363SPhilipp Reisner else if (header->command > P_MAX_OPT_CMD) 3511b411b363SPhilipp Reisner handler = receive_skip; 3512b411b363SPhilipp Reisner else 3513b411b363SPhilipp Reisner handler = NULL; 3514b411b363SPhilipp Reisner 3515b411b363SPhilipp Reisner if (unlikely(!handler)) { 3516b411b363SPhilipp Reisner dev_err(DEV, "unknown packet type %d, l: %d!\n", 3517b411b363SPhilipp Reisner header->command, header->length); 3518b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3519b411b363SPhilipp Reisner break; 3520b411b363SPhilipp Reisner } 3521b411b363SPhilipp Reisner if (unlikely(!handler(mdev, header))) { 3522b411b363SPhilipp Reisner dev_err(DEV, "error receiving %s, l: %d!\n", 3523b411b363SPhilipp Reisner cmdname(header->command), header->length); 3524b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3525b411b363SPhilipp Reisner break; 3526b411b363SPhilipp Reisner } 3527b411b363SPhilipp Reisner } 3528b411b363SPhilipp Reisner } 3529b411b363SPhilipp Reisner 3530b411b363SPhilipp Reisner static void drbd_fail_pending_reads(struct drbd_conf *mdev) 3531b411b363SPhilipp Reisner { 3532b411b363SPhilipp Reisner struct hlist_head *slot; 3533b411b363SPhilipp Reisner struct hlist_node *pos; 3534b411b363SPhilipp Reisner struct hlist_node *tmp; 3535b411b363SPhilipp Reisner struct drbd_request *req; 3536b411b363SPhilipp Reisner int i; 3537b411b363SPhilipp Reisner 3538b411b363SPhilipp Reisner /* 3539b411b363SPhilipp Reisner * Application READ requests 3540b411b363SPhilipp Reisner */ 3541b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3542b411b363SPhilipp Reisner for (i = 0; i < APP_R_HSIZE; i++) { 3543b411b363SPhilipp Reisner slot = mdev->app_reads_hash+i; 3544b411b363SPhilipp Reisner hlist_for_each_entry_safe(req, pos, tmp, slot, colision) { 3545b411b363SPhilipp Reisner /* it may (but should not any longer!) 3546b411b363SPhilipp Reisner * be on the work queue; if that assert triggers, 3547b411b363SPhilipp Reisner * we need to also grab the 3548b411b363SPhilipp Reisner * spin_lock_irq(&mdev->data.work.q_lock); 3549b411b363SPhilipp Reisner * and list_del_init here. */ 3550b411b363SPhilipp Reisner D_ASSERT(list_empty(&req->w.list)); 3551b411b363SPhilipp Reisner /* It would be nice to complete outside of spinlock. 3552b411b363SPhilipp Reisner * But this is easier for now. */ 3553b411b363SPhilipp Reisner _req_mod(req, connection_lost_while_pending); 3554b411b363SPhilipp Reisner } 3555b411b363SPhilipp Reisner } 3556b411b363SPhilipp Reisner for (i = 0; i < APP_R_HSIZE; i++) 3557b411b363SPhilipp Reisner if (!hlist_empty(mdev->app_reads_hash+i)) 3558b411b363SPhilipp Reisner dev_warn(DEV, "ASSERT FAILED: app_reads_hash[%d].first: " 3559b411b363SPhilipp Reisner "%p, should be NULL\n", i, mdev->app_reads_hash[i].first); 3560b411b363SPhilipp Reisner 3561b411b363SPhilipp Reisner memset(mdev->app_reads_hash, 0, APP_R_HSIZE*sizeof(void *)); 3562b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3563b411b363SPhilipp Reisner } 3564b411b363SPhilipp Reisner 3565b411b363SPhilipp Reisner void drbd_flush_workqueue(struct drbd_conf *mdev) 3566b411b363SPhilipp Reisner { 3567b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 3568b411b363SPhilipp Reisner 3569b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 3570b411b363SPhilipp Reisner init_completion(&barr.done); 3571b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, &barr.w); 3572b411b363SPhilipp Reisner wait_for_completion(&barr.done); 3573b411b363SPhilipp Reisner } 3574b411b363SPhilipp Reisner 3575b411b363SPhilipp Reisner static void drbd_disconnect(struct drbd_conf *mdev) 3576b411b363SPhilipp Reisner { 3577b411b363SPhilipp Reisner enum drbd_fencing_p fp; 3578b411b363SPhilipp Reisner union drbd_state os, ns; 3579b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 3580b411b363SPhilipp Reisner unsigned int i; 3581b411b363SPhilipp Reisner 3582b411b363SPhilipp Reisner if (mdev->state.conn == C_STANDALONE) 3583b411b363SPhilipp Reisner return; 3584b411b363SPhilipp Reisner if (mdev->state.conn >= C_WF_CONNECTION) 3585b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED cstate = %s, expected < WFConnection\n", 3586b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3587b411b363SPhilipp Reisner 3588b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 3589b411b363SPhilipp Reisner drbd_thread_stop(&mdev->asender); 3590b411b363SPhilipp Reisner 3591b411b363SPhilipp Reisner mutex_lock(&mdev->data.mutex); 3592b411b363SPhilipp Reisner drbd_free_sock(mdev); 3593b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3594b411b363SPhilipp Reisner 3595b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3596b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 3597b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 3598b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 3599b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3600b411b363SPhilipp Reisner 3601b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 3602b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 3603b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 3604b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 3605b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 3606b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 3607b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 3608b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 3609b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 3610b411b363SPhilipp Reisner * on the fly. */ 3611b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 3612b411b363SPhilipp Reisner mdev->rs_total = 0; 3613b411b363SPhilipp Reisner mdev->rs_failed = 0; 3614b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 3615b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 3616b411b363SPhilipp Reisner 3617b411b363SPhilipp Reisner /* make sure syncer is stopped and w_resume_next_sg queued */ 3618b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 3619b411b363SPhilipp Reisner set_bit(STOP_SYNC_TIMER, &mdev->flags); 3620b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 3621b411b363SPhilipp Reisner 3622b411b363SPhilipp Reisner /* so we can be sure that all remote or resync reads 3623b411b363SPhilipp Reisner * made it at least to net_ee */ 3624b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt)); 3625b411b363SPhilipp Reisner 3626b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 3627b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 3628b411b363SPhilipp Reisner * to be "canceled" */ 3629b411b363SPhilipp Reisner drbd_flush_workqueue(mdev); 3630b411b363SPhilipp Reisner 3631b411b363SPhilipp Reisner /* This also does reclaim_net_ee(). If we do this too early, we might 3632b411b363SPhilipp Reisner * miss some resync ee and pages.*/ 3633b411b363SPhilipp Reisner drbd_process_done_ee(mdev); 3634b411b363SPhilipp Reisner 3635b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3636b411b363SPhilipp Reisner mdev->p_uuid = NULL; 3637b411b363SPhilipp Reisner 3638b411b363SPhilipp Reisner if (!mdev->state.susp) 3639b411b363SPhilipp Reisner tl_clear(mdev); 3640b411b363SPhilipp Reisner 3641b411b363SPhilipp Reisner drbd_fail_pending_reads(mdev); 3642b411b363SPhilipp Reisner 3643b411b363SPhilipp Reisner dev_info(DEV, "Connection closed\n"); 3644b411b363SPhilipp Reisner 3645b411b363SPhilipp Reisner drbd_md_sync(mdev); 3646b411b363SPhilipp Reisner 3647b411b363SPhilipp Reisner fp = FP_DONT_CARE; 3648b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3649b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 3650b411b363SPhilipp Reisner put_ldev(mdev); 3651b411b363SPhilipp Reisner } 3652b411b363SPhilipp Reisner 3653b411b363SPhilipp Reisner if (mdev->state.role == R_PRIMARY) { 3654b411b363SPhilipp Reisner if (fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) { 3655b411b363SPhilipp Reisner enum drbd_disk_state nps = drbd_try_outdate_peer(mdev); 3656b411b363SPhilipp Reisner drbd_request_state(mdev, NS(pdsk, nps)); 3657b411b363SPhilipp Reisner } 3658b411b363SPhilipp Reisner } 3659b411b363SPhilipp Reisner 3660b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3661b411b363SPhilipp Reisner os = mdev->state; 3662b411b363SPhilipp Reisner if (os.conn >= C_UNCONNECTED) { 3663b411b363SPhilipp Reisner /* Do not restart in case we are C_DISCONNECTING */ 3664b411b363SPhilipp Reisner ns = os; 3665b411b363SPhilipp Reisner ns.conn = C_UNCONNECTED; 3666b411b363SPhilipp Reisner rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 3667b411b363SPhilipp Reisner } 3668b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3669b411b363SPhilipp Reisner 3670b411b363SPhilipp Reisner if (os.conn == C_DISCONNECTING) { 3671b411b363SPhilipp Reisner struct hlist_head *h; 3672b411b363SPhilipp Reisner wait_event(mdev->misc_wait, atomic_read(&mdev->net_cnt) == 0); 3673b411b363SPhilipp Reisner 3674b411b363SPhilipp Reisner /* we must not free the tl_hash 3675b411b363SPhilipp Reisner * while application io is still on the fly */ 3676b411b363SPhilipp Reisner wait_event(mdev->misc_wait, atomic_read(&mdev->ap_bio_cnt) == 0); 3677b411b363SPhilipp Reisner 3678b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 3679b411b363SPhilipp Reisner /* paranoia code */ 3680b411b363SPhilipp Reisner for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++) 3681b411b363SPhilipp Reisner if (h->first) 3682b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n", 3683b411b363SPhilipp Reisner (int)(h - mdev->ee_hash), h->first); 3684b411b363SPhilipp Reisner kfree(mdev->ee_hash); 3685b411b363SPhilipp Reisner mdev->ee_hash = NULL; 3686b411b363SPhilipp Reisner mdev->ee_hash_s = 0; 3687b411b363SPhilipp Reisner 3688b411b363SPhilipp Reisner /* paranoia code */ 3689b411b363SPhilipp Reisner for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++) 3690b411b363SPhilipp Reisner if (h->first) 3691b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n", 3692b411b363SPhilipp Reisner (int)(h - mdev->tl_hash), h->first); 3693b411b363SPhilipp Reisner kfree(mdev->tl_hash); 3694b411b363SPhilipp Reisner mdev->tl_hash = NULL; 3695b411b363SPhilipp Reisner mdev->tl_hash_s = 0; 3696b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 3697b411b363SPhilipp Reisner 3698b411b363SPhilipp Reisner crypto_free_hash(mdev->cram_hmac_tfm); 3699b411b363SPhilipp Reisner mdev->cram_hmac_tfm = NULL; 3700b411b363SPhilipp Reisner 3701b411b363SPhilipp Reisner kfree(mdev->net_conf); 3702b411b363SPhilipp Reisner mdev->net_conf = NULL; 3703b411b363SPhilipp Reisner drbd_request_state(mdev, NS(conn, C_STANDALONE)); 3704b411b363SPhilipp Reisner } 3705b411b363SPhilipp Reisner 3706b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 3707b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 3708b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 3709b411b363SPhilipp Reisner * 3710b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 3711b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 3712b411b363SPhilipp Reisner */ 3713b411b363SPhilipp Reisner i = drbd_release_ee(mdev, &mdev->net_ee); 3714b411b363SPhilipp Reisner if (i) 3715b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 3716b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 3717b411b363SPhilipp Reisner if (i) 3718b411b363SPhilipp Reisner dev_info(DEV, "pp_in_use = %u, expected 0\n", i); 3719b411b363SPhilipp Reisner 3720b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 3721b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 3722b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 3723b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 3724b411b363SPhilipp Reisner 3725b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 3726b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 3727b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 3728b411b363SPhilipp Reisner } 3729b411b363SPhilipp Reisner 3730b411b363SPhilipp Reisner /* 3731b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 3732b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 3733b411b363SPhilipp Reisner * 3734b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 3735b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 3736b411b363SPhilipp Reisner * 3737b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 3738b411b363SPhilipp Reisner */ 3739b411b363SPhilipp Reisner static int drbd_send_handshake(struct drbd_conf *mdev) 3740b411b363SPhilipp Reisner { 3741b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3742b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.sbuf.handshake; 3743b411b363SPhilipp Reisner int ok; 3744b411b363SPhilipp Reisner 3745b411b363SPhilipp Reisner if (mutex_lock_interruptible(&mdev->data.mutex)) { 3746b411b363SPhilipp Reisner dev_err(DEV, "interrupted during initial handshake\n"); 3747b411b363SPhilipp Reisner return 0; /* interrupted. not ok. */ 3748b411b363SPhilipp Reisner } 3749b411b363SPhilipp Reisner 3750b411b363SPhilipp Reisner if (mdev->data.socket == NULL) { 3751b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3752b411b363SPhilipp Reisner return 0; 3753b411b363SPhilipp Reisner } 3754b411b363SPhilipp Reisner 3755b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 3756b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 3757b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 3758b411b363SPhilipp Reisner ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE, 3759b411b363SPhilipp Reisner (struct p_header *)p, sizeof(*p), 0 ); 3760b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 3761b411b363SPhilipp Reisner return ok; 3762b411b363SPhilipp Reisner } 3763b411b363SPhilipp Reisner 3764b411b363SPhilipp Reisner /* 3765b411b363SPhilipp Reisner * return values: 3766b411b363SPhilipp Reisner * 1 yes, we have a valid connection 3767b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 3768b411b363SPhilipp Reisner * -1 peer talks different language, 3769b411b363SPhilipp Reisner * no point in trying again, please go standalone. 3770b411b363SPhilipp Reisner */ 3771b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev) 3772b411b363SPhilipp Reisner { 3773b411b363SPhilipp Reisner /* ASSERT current == mdev->receiver ... */ 3774b411b363SPhilipp Reisner struct p_handshake *p = &mdev->data.rbuf.handshake; 3775b411b363SPhilipp Reisner const int expect = sizeof(struct p_handshake) 3776b411b363SPhilipp Reisner -sizeof(struct p_header); 3777b411b363SPhilipp Reisner int rv; 3778b411b363SPhilipp Reisner 3779b411b363SPhilipp Reisner rv = drbd_send_handshake(mdev); 3780b411b363SPhilipp Reisner if (!rv) 3781b411b363SPhilipp Reisner return 0; 3782b411b363SPhilipp Reisner 3783b411b363SPhilipp Reisner rv = drbd_recv_header(mdev, &p->head); 3784b411b363SPhilipp Reisner if (!rv) 3785b411b363SPhilipp Reisner return 0; 3786b411b363SPhilipp Reisner 3787b411b363SPhilipp Reisner if (p->head.command != P_HAND_SHAKE) { 3788b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", 3789b411b363SPhilipp Reisner cmdname(p->head.command), p->head.command); 3790b411b363SPhilipp Reisner return -1; 3791b411b363SPhilipp Reisner } 3792b411b363SPhilipp Reisner 3793b411b363SPhilipp Reisner if (p->head.length != expect) { 3794b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake length: %u, received: %u\n", 3795b411b363SPhilipp Reisner expect, p->head.length); 3796b411b363SPhilipp Reisner return -1; 3797b411b363SPhilipp Reisner } 3798b411b363SPhilipp Reisner 3799b411b363SPhilipp Reisner rv = drbd_recv(mdev, &p->head.payload, expect); 3800b411b363SPhilipp Reisner 3801b411b363SPhilipp Reisner if (rv != expect) { 3802b411b363SPhilipp Reisner dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv); 3803b411b363SPhilipp Reisner return 0; 3804b411b363SPhilipp Reisner } 3805b411b363SPhilipp Reisner 3806b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 3807b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 3808b411b363SPhilipp Reisner if (p->protocol_max == 0) 3809b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 3810b411b363SPhilipp Reisner 3811b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 3812b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 3813b411b363SPhilipp Reisner goto incompat; 3814b411b363SPhilipp Reisner 3815b411b363SPhilipp Reisner mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 3816b411b363SPhilipp Reisner 3817b411b363SPhilipp Reisner dev_info(DEV, "Handshake successful: " 3818b411b363SPhilipp Reisner "Agreed network protocol version %d\n", mdev->agreed_pro_version); 3819b411b363SPhilipp Reisner 3820b411b363SPhilipp Reisner return 1; 3821b411b363SPhilipp Reisner 3822b411b363SPhilipp Reisner incompat: 3823b411b363SPhilipp Reisner dev_err(DEV, "incompatible DRBD dialects: " 3824b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 3825b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 3826b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 3827b411b363SPhilipp Reisner return -1; 3828b411b363SPhilipp Reisner } 3829b411b363SPhilipp Reisner 3830b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 3831b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 3832b411b363SPhilipp Reisner { 3833b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 3834b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 3835b411b363SPhilipp Reisner return 0; 3836b411b363SPhilipp Reisner } 3837b411b363SPhilipp Reisner #else 3838b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 3839b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 3840b411b363SPhilipp Reisner { 3841b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 3842b411b363SPhilipp Reisner struct scatterlist sg; 3843b411b363SPhilipp Reisner char *response = NULL; 3844b411b363SPhilipp Reisner char *right_response = NULL; 3845b411b363SPhilipp Reisner char *peers_ch = NULL; 3846b411b363SPhilipp Reisner struct p_header p; 3847b411b363SPhilipp Reisner unsigned int key_len = strlen(mdev->net_conf->shared_secret); 3848b411b363SPhilipp Reisner unsigned int resp_size; 3849b411b363SPhilipp Reisner struct hash_desc desc; 3850b411b363SPhilipp Reisner int rv; 3851b411b363SPhilipp Reisner 3852b411b363SPhilipp Reisner desc.tfm = mdev->cram_hmac_tfm; 3853b411b363SPhilipp Reisner desc.flags = 0; 3854b411b363SPhilipp Reisner 3855b411b363SPhilipp Reisner rv = crypto_hash_setkey(mdev->cram_hmac_tfm, 3856b411b363SPhilipp Reisner (u8 *)mdev->net_conf->shared_secret, key_len); 3857b411b363SPhilipp Reisner if (rv) { 3858b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); 3859b411b363SPhilipp Reisner rv = 0; 3860b411b363SPhilipp Reisner goto fail; 3861b411b363SPhilipp Reisner } 3862b411b363SPhilipp Reisner 3863b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 3864b411b363SPhilipp Reisner 3865b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); 3866b411b363SPhilipp Reisner if (!rv) 3867b411b363SPhilipp Reisner goto fail; 3868b411b363SPhilipp Reisner 3869b411b363SPhilipp Reisner rv = drbd_recv_header(mdev, &p); 3870b411b363SPhilipp Reisner if (!rv) 3871b411b363SPhilipp Reisner goto fail; 3872b411b363SPhilipp Reisner 3873b411b363SPhilipp Reisner if (p.command != P_AUTH_CHALLENGE) { 3874b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", 3875b411b363SPhilipp Reisner cmdname(p.command), p.command); 3876b411b363SPhilipp Reisner rv = 0; 3877b411b363SPhilipp Reisner goto fail; 3878b411b363SPhilipp Reisner } 3879b411b363SPhilipp Reisner 3880b411b363SPhilipp Reisner if (p.length > CHALLENGE_LEN*2) { 3881b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge payload too big.\n"); 3882b411b363SPhilipp Reisner rv = 0; 3883b411b363SPhilipp Reisner goto fail; 3884b411b363SPhilipp Reisner } 3885b411b363SPhilipp Reisner 3886b411b363SPhilipp Reisner peers_ch = kmalloc(p.length, GFP_NOIO); 3887b411b363SPhilipp Reisner if (peers_ch == NULL) { 3888b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of peers_ch failed\n"); 3889b411b363SPhilipp Reisner rv = 0; 3890b411b363SPhilipp Reisner goto fail; 3891b411b363SPhilipp Reisner } 3892b411b363SPhilipp Reisner 3893b411b363SPhilipp Reisner rv = drbd_recv(mdev, peers_ch, p.length); 3894b411b363SPhilipp Reisner 3895b411b363SPhilipp Reisner if (rv != p.length) { 3896b411b363SPhilipp Reisner dev_err(DEV, "short read AuthChallenge: l=%u\n", rv); 3897b411b363SPhilipp Reisner rv = 0; 3898b411b363SPhilipp Reisner goto fail; 3899b411b363SPhilipp Reisner } 3900b411b363SPhilipp Reisner 3901b411b363SPhilipp Reisner resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm); 3902b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 3903b411b363SPhilipp Reisner if (response == NULL) { 3904b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of response failed\n"); 3905b411b363SPhilipp Reisner rv = 0; 3906b411b363SPhilipp Reisner goto fail; 3907b411b363SPhilipp Reisner } 3908b411b363SPhilipp Reisner 3909b411b363SPhilipp Reisner sg_init_table(&sg, 1); 3910b411b363SPhilipp Reisner sg_set_buf(&sg, peers_ch, p.length); 3911b411b363SPhilipp Reisner 3912b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 3913b411b363SPhilipp Reisner if (rv) { 3914b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 3915b411b363SPhilipp Reisner rv = 0; 3916b411b363SPhilipp Reisner goto fail; 3917b411b363SPhilipp Reisner } 3918b411b363SPhilipp Reisner 3919b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); 3920b411b363SPhilipp Reisner if (!rv) 3921b411b363SPhilipp Reisner goto fail; 3922b411b363SPhilipp Reisner 3923b411b363SPhilipp Reisner rv = drbd_recv_header(mdev, &p); 3924b411b363SPhilipp Reisner if (!rv) 3925b411b363SPhilipp Reisner goto fail; 3926b411b363SPhilipp Reisner 3927b411b363SPhilipp Reisner if (p.command != P_AUTH_RESPONSE) { 3928b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", 3929b411b363SPhilipp Reisner cmdname(p.command), p.command); 3930b411b363SPhilipp Reisner rv = 0; 3931b411b363SPhilipp Reisner goto fail; 3932b411b363SPhilipp Reisner } 3933b411b363SPhilipp Reisner 3934b411b363SPhilipp Reisner if (p.length != resp_size) { 3935b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse payload of wrong size\n"); 3936b411b363SPhilipp Reisner rv = 0; 3937b411b363SPhilipp Reisner goto fail; 3938b411b363SPhilipp Reisner } 3939b411b363SPhilipp Reisner 3940b411b363SPhilipp Reisner rv = drbd_recv(mdev, response , resp_size); 3941b411b363SPhilipp Reisner 3942b411b363SPhilipp Reisner if (rv != resp_size) { 3943b411b363SPhilipp Reisner dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv); 3944b411b363SPhilipp Reisner rv = 0; 3945b411b363SPhilipp Reisner goto fail; 3946b411b363SPhilipp Reisner } 3947b411b363SPhilipp Reisner 3948b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 3949b411b363SPhilipp Reisner if (response == NULL) { 3950b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of right_response failed\n"); 3951b411b363SPhilipp Reisner rv = 0; 3952b411b363SPhilipp Reisner goto fail; 3953b411b363SPhilipp Reisner } 3954b411b363SPhilipp Reisner 3955b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 3956b411b363SPhilipp Reisner 3957b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 3958b411b363SPhilipp Reisner if (rv) { 3959b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 3960b411b363SPhilipp Reisner rv = 0; 3961b411b363SPhilipp Reisner goto fail; 3962b411b363SPhilipp Reisner } 3963b411b363SPhilipp Reisner 3964b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 3965b411b363SPhilipp Reisner 3966b411b363SPhilipp Reisner if (rv) 3967b411b363SPhilipp Reisner dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", 3968b411b363SPhilipp Reisner resp_size, mdev->net_conf->cram_hmac_alg); 3969b411b363SPhilipp Reisner 3970b411b363SPhilipp Reisner fail: 3971b411b363SPhilipp Reisner kfree(peers_ch); 3972b411b363SPhilipp Reisner kfree(response); 3973b411b363SPhilipp Reisner kfree(right_response); 3974b411b363SPhilipp Reisner 3975b411b363SPhilipp Reisner return rv; 3976b411b363SPhilipp Reisner } 3977b411b363SPhilipp Reisner #endif 3978b411b363SPhilipp Reisner 3979b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 3980b411b363SPhilipp Reisner { 3981b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 3982b411b363SPhilipp Reisner unsigned int minor = mdev_to_minor(mdev); 3983b411b363SPhilipp Reisner int h; 3984b411b363SPhilipp Reisner 3985b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_receiver", minor); 3986b411b363SPhilipp Reisner 3987b411b363SPhilipp Reisner dev_info(DEV, "receiver (re)started\n"); 3988b411b363SPhilipp Reisner 3989b411b363SPhilipp Reisner do { 3990b411b363SPhilipp Reisner h = drbd_connect(mdev); 3991b411b363SPhilipp Reisner if (h == 0) { 3992b411b363SPhilipp Reisner drbd_disconnect(mdev); 3993b411b363SPhilipp Reisner __set_current_state(TASK_INTERRUPTIBLE); 3994b411b363SPhilipp Reisner schedule_timeout(HZ); 3995b411b363SPhilipp Reisner } 3996b411b363SPhilipp Reisner if (h == -1) { 3997b411b363SPhilipp Reisner dev_warn(DEV, "Discarding network configuration.\n"); 3998b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3999b411b363SPhilipp Reisner } 4000b411b363SPhilipp Reisner } while (h == 0); 4001b411b363SPhilipp Reisner 4002b411b363SPhilipp Reisner if (h > 0) { 4003b411b363SPhilipp Reisner if (get_net_conf(mdev)) { 4004b411b363SPhilipp Reisner drbdd(mdev); 4005b411b363SPhilipp Reisner put_net_conf(mdev); 4006b411b363SPhilipp Reisner } 4007b411b363SPhilipp Reisner } 4008b411b363SPhilipp Reisner 4009b411b363SPhilipp Reisner drbd_disconnect(mdev); 4010b411b363SPhilipp Reisner 4011b411b363SPhilipp Reisner dev_info(DEV, "receiver terminated\n"); 4012b411b363SPhilipp Reisner return 0; 4013b411b363SPhilipp Reisner } 4014b411b363SPhilipp Reisner 4015b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4016b411b363SPhilipp Reisner 4017b411b363SPhilipp Reisner static int got_RqSReply(struct drbd_conf *mdev, struct p_header *h) 4018b411b363SPhilipp Reisner { 4019b411b363SPhilipp Reisner struct p_req_state_reply *p = (struct p_req_state_reply *)h; 4020b411b363SPhilipp Reisner 4021b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4022b411b363SPhilipp Reisner 4023b411b363SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4024b411b363SPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4025b411b363SPhilipp Reisner } else { 4026b411b363SPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4027b411b363SPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4028b411b363SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4029b411b363SPhilipp Reisner } 4030b411b363SPhilipp Reisner wake_up(&mdev->state_wait); 4031b411b363SPhilipp Reisner 4032b411b363SPhilipp Reisner return TRUE; 4033b411b363SPhilipp Reisner } 4034b411b363SPhilipp Reisner 4035b411b363SPhilipp Reisner static int got_Ping(struct drbd_conf *mdev, struct p_header *h) 4036b411b363SPhilipp Reisner { 4037b411b363SPhilipp Reisner return drbd_send_ping_ack(mdev); 4038b411b363SPhilipp Reisner 4039b411b363SPhilipp Reisner } 4040b411b363SPhilipp Reisner 4041b411b363SPhilipp Reisner static int got_PingAck(struct drbd_conf *mdev, struct p_header *h) 4042b411b363SPhilipp Reisner { 4043b411b363SPhilipp Reisner /* restore idle timeout */ 4044b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; 4045b411b363SPhilipp Reisner 4046b411b363SPhilipp Reisner return TRUE; 4047b411b363SPhilipp Reisner } 4048b411b363SPhilipp Reisner 4049b411b363SPhilipp Reisner static int got_IsInSync(struct drbd_conf *mdev, struct p_header *h) 4050b411b363SPhilipp Reisner { 4051b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4052b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4053b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4054b411b363SPhilipp Reisner 4055b411b363SPhilipp Reisner D_ASSERT(mdev->agreed_pro_version >= 89); 4056b411b363SPhilipp Reisner 4057b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4058b411b363SPhilipp Reisner 4059b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4060b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4061b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4062b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 4063b411b363SPhilipp Reisner dec_rs_pending(mdev); 4064b411b363SPhilipp Reisner 4065b411b363SPhilipp Reisner return TRUE; 4066b411b363SPhilipp Reisner } 4067b411b363SPhilipp Reisner 4068b411b363SPhilipp Reisner /* when we receive the ACK for a write request, 4069b411b363SPhilipp Reisner * verify that we actually know about it */ 4070b411b363SPhilipp Reisner static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev, 4071b411b363SPhilipp Reisner u64 id, sector_t sector) 4072b411b363SPhilipp Reisner { 4073b411b363SPhilipp Reisner struct hlist_head *slot = tl_hash_slot(mdev, sector); 4074b411b363SPhilipp Reisner struct hlist_node *n; 4075b411b363SPhilipp Reisner struct drbd_request *req; 4076b411b363SPhilipp Reisner 4077b411b363SPhilipp Reisner hlist_for_each_entry(req, n, slot, colision) { 4078b411b363SPhilipp Reisner if ((unsigned long)req == (unsigned long)id) { 4079b411b363SPhilipp Reisner if (req->sector != sector) { 4080b411b363SPhilipp Reisner dev_err(DEV, "_ack_id_to_req: found req %p but it has " 4081b411b363SPhilipp Reisner "wrong sector (%llus versus %llus)\n", req, 4082b411b363SPhilipp Reisner (unsigned long long)req->sector, 4083b411b363SPhilipp Reisner (unsigned long long)sector); 4084b411b363SPhilipp Reisner break; 4085b411b363SPhilipp Reisner } 4086b411b363SPhilipp Reisner return req; 4087b411b363SPhilipp Reisner } 4088b411b363SPhilipp Reisner } 4089b411b363SPhilipp Reisner dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n", 4090b411b363SPhilipp Reisner (void *)(unsigned long)id, (unsigned long long)sector); 4091b411b363SPhilipp Reisner return NULL; 4092b411b363SPhilipp Reisner } 4093b411b363SPhilipp Reisner 4094b411b363SPhilipp Reisner typedef struct drbd_request *(req_validator_fn) 4095b411b363SPhilipp Reisner (struct drbd_conf *mdev, u64 id, sector_t sector); 4096b411b363SPhilipp Reisner 4097b411b363SPhilipp Reisner static int validate_req_change_req_state(struct drbd_conf *mdev, 4098b411b363SPhilipp Reisner u64 id, sector_t sector, req_validator_fn validator, 4099b411b363SPhilipp Reisner const char *func, enum drbd_req_event what) 4100b411b363SPhilipp Reisner { 4101b411b363SPhilipp Reisner struct drbd_request *req; 4102b411b363SPhilipp Reisner struct bio_and_error m; 4103b411b363SPhilipp Reisner 4104b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4105b411b363SPhilipp Reisner req = validator(mdev, id, sector); 4106b411b363SPhilipp Reisner if (unlikely(!req)) { 4107b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4108b411b363SPhilipp Reisner dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func); 4109b411b363SPhilipp Reisner return FALSE; 4110b411b363SPhilipp Reisner } 4111b411b363SPhilipp Reisner __req_mod(req, what, &m); 4112b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4113b411b363SPhilipp Reisner 4114b411b363SPhilipp Reisner if (m.bio) 4115b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 4116b411b363SPhilipp Reisner return TRUE; 4117b411b363SPhilipp Reisner } 4118b411b363SPhilipp Reisner 4119b411b363SPhilipp Reisner static int got_BlockAck(struct drbd_conf *mdev, struct p_header *h) 4120b411b363SPhilipp Reisner { 4121b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4122b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4123b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4124b411b363SPhilipp Reisner enum drbd_req_event what; 4125b411b363SPhilipp Reisner 4126b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4127b411b363SPhilipp Reisner 4128b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4129b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4130b411b363SPhilipp Reisner dec_rs_pending(mdev); 4131b411b363SPhilipp Reisner return TRUE; 4132b411b363SPhilipp Reisner } 4133b411b363SPhilipp Reisner switch (be16_to_cpu(h->command)) { 4134b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 4135b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4136b411b363SPhilipp Reisner what = write_acked_by_peer_and_sis; 4137b411b363SPhilipp Reisner break; 4138b411b363SPhilipp Reisner case P_WRITE_ACK: 4139b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4140b411b363SPhilipp Reisner what = write_acked_by_peer; 4141b411b363SPhilipp Reisner break; 4142b411b363SPhilipp Reisner case P_RECV_ACK: 4143b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B); 4144b411b363SPhilipp Reisner what = recv_acked_by_peer; 4145b411b363SPhilipp Reisner break; 4146b411b363SPhilipp Reisner case P_DISCARD_ACK: 4147b411b363SPhilipp Reisner D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); 4148b411b363SPhilipp Reisner what = conflict_discarded_by_peer; 4149b411b363SPhilipp Reisner break; 4150b411b363SPhilipp Reisner default: 4151b411b363SPhilipp Reisner D_ASSERT(0); 4152b411b363SPhilipp Reisner return FALSE; 4153b411b363SPhilipp Reisner } 4154b411b363SPhilipp Reisner 4155b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4156b411b363SPhilipp Reisner _ack_id_to_req, __func__ , what); 4157b411b363SPhilipp Reisner } 4158b411b363SPhilipp Reisner 4159b411b363SPhilipp Reisner static int got_NegAck(struct drbd_conf *mdev, struct p_header *h) 4160b411b363SPhilipp Reisner { 4161b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4162b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4163b411b363SPhilipp Reisner 4164b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 4165b411b363SPhilipp Reisner dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n"); 4166b411b363SPhilipp Reisner 4167b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4168b411b363SPhilipp Reisner 4169b411b363SPhilipp Reisner if (is_syncer_block_id(p->block_id)) { 4170b411b363SPhilipp Reisner int size = be32_to_cpu(p->blksize); 4171b411b363SPhilipp Reisner dec_rs_pending(mdev); 4172b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4173b411b363SPhilipp Reisner return TRUE; 4174b411b363SPhilipp Reisner } 4175b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4176b411b363SPhilipp Reisner _ack_id_to_req, __func__ , neg_acked); 4177b411b363SPhilipp Reisner } 4178b411b363SPhilipp Reisner 4179b411b363SPhilipp Reisner static int got_NegDReply(struct drbd_conf *mdev, struct p_header *h) 4180b411b363SPhilipp Reisner { 4181b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4182b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4183b411b363SPhilipp Reisner 4184b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4185b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4186b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4187b411b363SPhilipp Reisner 4188b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4189b411b363SPhilipp Reisner _ar_id_to_req, __func__ , neg_acked); 4190b411b363SPhilipp Reisner } 4191b411b363SPhilipp Reisner 4192b411b363SPhilipp Reisner static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header *h) 4193b411b363SPhilipp Reisner { 4194b411b363SPhilipp Reisner sector_t sector; 4195b411b363SPhilipp Reisner int size; 4196b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4197b411b363SPhilipp Reisner 4198b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4199b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4200b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 4201b411b363SPhilipp Reisner 4202b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4203b411b363SPhilipp Reisner 4204b411b363SPhilipp Reisner dec_rs_pending(mdev); 4205b411b363SPhilipp Reisner 4206b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4207b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4208b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4209b411b363SPhilipp Reisner put_ldev(mdev); 4210b411b363SPhilipp Reisner } 4211b411b363SPhilipp Reisner 4212b411b363SPhilipp Reisner return TRUE; 4213b411b363SPhilipp Reisner } 4214b411b363SPhilipp Reisner 4215b411b363SPhilipp Reisner static int got_BarrierAck(struct drbd_conf *mdev, struct p_header *h) 4216b411b363SPhilipp Reisner { 4217b411b363SPhilipp Reisner struct p_barrier_ack *p = (struct p_barrier_ack *)h; 4218b411b363SPhilipp Reisner 4219b411b363SPhilipp Reisner tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); 4220b411b363SPhilipp Reisner 4221b411b363SPhilipp Reisner return TRUE; 4222b411b363SPhilipp Reisner } 4223b411b363SPhilipp Reisner 4224b411b363SPhilipp Reisner static int got_OVResult(struct drbd_conf *mdev, struct p_header *h) 4225b411b363SPhilipp Reisner { 4226b411b363SPhilipp Reisner struct p_block_ack *p = (struct p_block_ack *)h; 4227b411b363SPhilipp Reisner struct drbd_work *w; 4228b411b363SPhilipp Reisner sector_t sector; 4229b411b363SPhilipp Reisner int size; 4230b411b363SPhilipp Reisner 4231b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4232b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4233b411b363SPhilipp Reisner 4234b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4235b411b363SPhilipp Reisner 4236b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 4237b411b363SPhilipp Reisner drbd_ov_oos_found(mdev, sector, size); 4238b411b363SPhilipp Reisner else 4239b411b363SPhilipp Reisner ov_oos_print(mdev); 4240b411b363SPhilipp Reisner 4241b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4242b411b363SPhilipp Reisner dec_rs_pending(mdev); 4243b411b363SPhilipp Reisner 4244b411b363SPhilipp Reisner if (--mdev->ov_left == 0) { 4245b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4246b411b363SPhilipp Reisner if (w) { 4247b411b363SPhilipp Reisner w->cb = w_ov_finished; 4248b411b363SPhilipp Reisner drbd_queue_work_front(&mdev->data.work, w); 4249b411b363SPhilipp Reisner } else { 4250b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 4251b411b363SPhilipp Reisner ov_oos_print(mdev); 4252b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4253b411b363SPhilipp Reisner } 4254b411b363SPhilipp Reisner } 4255b411b363SPhilipp Reisner return TRUE; 4256b411b363SPhilipp Reisner } 4257b411b363SPhilipp Reisner 4258b411b363SPhilipp Reisner struct asender_cmd { 4259b411b363SPhilipp Reisner size_t pkt_size; 4260b411b363SPhilipp Reisner int (*process)(struct drbd_conf *mdev, struct p_header *h); 4261b411b363SPhilipp Reisner }; 4262b411b363SPhilipp Reisner 4263b411b363SPhilipp Reisner static struct asender_cmd *get_asender_cmd(int cmd) 4264b411b363SPhilipp Reisner { 4265b411b363SPhilipp Reisner static struct asender_cmd asender_tbl[] = { 4266b411b363SPhilipp Reisner /* anything missing from this table is in 4267b411b363SPhilipp Reisner * the drbd_cmd_handler (drbd_default_handler) table, 4268b411b363SPhilipp Reisner * see the beginning of drbdd() */ 4269b411b363SPhilipp Reisner [P_PING] = { sizeof(struct p_header), got_Ping }, 4270b411b363SPhilipp Reisner [P_PING_ACK] = { sizeof(struct p_header), got_PingAck }, 4271b411b363SPhilipp Reisner [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4272b411b363SPhilipp Reisner [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4273b411b363SPhilipp Reisner [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4274b411b363SPhilipp Reisner [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4275b411b363SPhilipp Reisner [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 4276b411b363SPhilipp Reisner [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 4277b411b363SPhilipp Reisner [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4278b411b363SPhilipp Reisner [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 4279b411b363SPhilipp Reisner [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 4280b411b363SPhilipp Reisner [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 4281b411b363SPhilipp Reisner [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 4282b411b363SPhilipp Reisner [P_MAX_CMD] = { 0, NULL }, 4283b411b363SPhilipp Reisner }; 4284b411b363SPhilipp Reisner if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) 4285b411b363SPhilipp Reisner return NULL; 4286b411b363SPhilipp Reisner return &asender_tbl[cmd]; 4287b411b363SPhilipp Reisner } 4288b411b363SPhilipp Reisner 4289b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4290b411b363SPhilipp Reisner { 4291b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 4292b411b363SPhilipp Reisner struct p_header *h = &mdev->meta.rbuf.header; 4293b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 4294b411b363SPhilipp Reisner 4295b411b363SPhilipp Reisner int rv, len; 4296b411b363SPhilipp Reisner void *buf = h; 4297b411b363SPhilipp Reisner int received = 0; 4298b411b363SPhilipp Reisner int expect = sizeof(struct p_header); 4299b411b363SPhilipp Reisner int empty; 4300b411b363SPhilipp Reisner 4301b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); 4302b411b363SPhilipp Reisner 4303b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 4304b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 4305b411b363SPhilipp Reisner 4306b411b363SPhilipp Reisner while (get_t_state(thi) == Running) { 4307b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 4308b411b363SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &mdev->flags)) { 4309b411b363SPhilipp Reisner ERR_IF(!drbd_send_ping(mdev)) goto reconnect; 4310b411b363SPhilipp Reisner mdev->meta.socket->sk->sk_rcvtimeo = 4311b411b363SPhilipp Reisner mdev->net_conf->ping_timeo*HZ/10; 4312b411b363SPhilipp Reisner } 4313b411b363SPhilipp Reisner 4314b411b363SPhilipp Reisner /* conditionally cork; 4315b411b363SPhilipp Reisner * it may hurt latency if we cork without much to send */ 4316b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork && 4317b411b363SPhilipp Reisner 3 < atomic_read(&mdev->unacked_cnt)) 4318b411b363SPhilipp Reisner drbd_tcp_cork(mdev->meta.socket); 4319b411b363SPhilipp Reisner while (1) { 4320b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4321b411b363SPhilipp Reisner flush_signals(current); 4322b411b363SPhilipp Reisner if (!drbd_process_done_ee(mdev)) { 4323b411b363SPhilipp Reisner dev_err(DEV, "process_done_ee() = NOT_OK\n"); 4324b411b363SPhilipp Reisner goto reconnect; 4325b411b363SPhilipp Reisner } 4326b411b363SPhilipp Reisner /* to avoid race with newly queued ACKs */ 4327b411b363SPhilipp Reisner set_bit(SIGNAL_ASENDER, &mdev->flags); 4328b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 4329b411b363SPhilipp Reisner empty = list_empty(&mdev->done_ee); 4330b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 4331b411b363SPhilipp Reisner /* new ack may have been queued right here, 4332b411b363SPhilipp Reisner * but then there is also a signal pending, 4333b411b363SPhilipp Reisner * and we start over... */ 4334b411b363SPhilipp Reisner if (empty) 4335b411b363SPhilipp Reisner break; 4336b411b363SPhilipp Reisner } 4337b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 4338b411b363SPhilipp Reisner if (!mdev->net_conf->no_cork) 4339b411b363SPhilipp Reisner drbd_tcp_uncork(mdev->meta.socket); 4340b411b363SPhilipp Reisner 4341b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 4342b411b363SPhilipp Reisner if (signal_pending(current)) 4343b411b363SPhilipp Reisner continue; 4344b411b363SPhilipp Reisner 4345b411b363SPhilipp Reisner rv = drbd_recv_short(mdev, mdev->meta.socket, 4346b411b363SPhilipp Reisner buf, expect-received, 0); 4347b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4348b411b363SPhilipp Reisner 4349b411b363SPhilipp Reisner flush_signals(current); 4350b411b363SPhilipp Reisner 4351b411b363SPhilipp Reisner /* Note: 4352b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 4353b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 4354b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 4355b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 4356b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 4357b411b363SPhilipp Reisner * rv == expected: full header or command 4358b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 4359b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 4360b411b363SPhilipp Reisner */ 4361b411b363SPhilipp Reisner if (likely(rv > 0)) { 4362b411b363SPhilipp Reisner received += rv; 4363b411b363SPhilipp Reisner buf += rv; 4364b411b363SPhilipp Reisner } else if (rv == 0) { 4365b411b363SPhilipp Reisner dev_err(DEV, "meta connection shut down by peer.\n"); 4366b411b363SPhilipp Reisner goto reconnect; 4367b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 4368b411b363SPhilipp Reisner if (mdev->meta.socket->sk->sk_rcvtimeo == 4369b411b363SPhilipp Reisner mdev->net_conf->ping_timeo*HZ/10) { 4370b411b363SPhilipp Reisner dev_err(DEV, "PingAck did not arrive in time.\n"); 4371b411b363SPhilipp Reisner goto reconnect; 4372b411b363SPhilipp Reisner } 4373b411b363SPhilipp Reisner set_bit(SEND_PING, &mdev->flags); 4374b411b363SPhilipp Reisner continue; 4375b411b363SPhilipp Reisner } else if (rv == -EINTR) { 4376b411b363SPhilipp Reisner continue; 4377b411b363SPhilipp Reisner } else { 4378b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 4379b411b363SPhilipp Reisner goto reconnect; 4380b411b363SPhilipp Reisner } 4381b411b363SPhilipp Reisner 4382b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 4383b411b363SPhilipp Reisner if (unlikely(h->magic != BE_DRBD_MAGIC)) { 4384b411b363SPhilipp Reisner dev_err(DEV, "magic?? on meta m: 0x%lx c: %d l: %d\n", 4385b411b363SPhilipp Reisner (long)be32_to_cpu(h->magic), 4386b411b363SPhilipp Reisner h->command, h->length); 4387b411b363SPhilipp Reisner goto reconnect; 4388b411b363SPhilipp Reisner } 4389b411b363SPhilipp Reisner cmd = get_asender_cmd(be16_to_cpu(h->command)); 4390b411b363SPhilipp Reisner len = be16_to_cpu(h->length); 4391b411b363SPhilipp Reisner if (unlikely(cmd == NULL)) { 4392b411b363SPhilipp Reisner dev_err(DEV, "unknown command?? on meta m: 0x%lx c: %d l: %d\n", 4393b411b363SPhilipp Reisner (long)be32_to_cpu(h->magic), 4394b411b363SPhilipp Reisner h->command, h->length); 4395b411b363SPhilipp Reisner goto disconnect; 4396b411b363SPhilipp Reisner } 4397b411b363SPhilipp Reisner expect = cmd->pkt_size; 43986a0afdf5SJens Axboe ERR_IF(len != expect-sizeof(struct p_header)) 4399b411b363SPhilipp Reisner goto reconnect; 4400b411b363SPhilipp Reisner } 4401b411b363SPhilipp Reisner if (received == expect) { 4402b411b363SPhilipp Reisner D_ASSERT(cmd != NULL); 4403b411b363SPhilipp Reisner if (!cmd->process(mdev, h)) 4404b411b363SPhilipp Reisner goto reconnect; 4405b411b363SPhilipp Reisner 4406b411b363SPhilipp Reisner buf = h; 4407b411b363SPhilipp Reisner received = 0; 4408b411b363SPhilipp Reisner expect = sizeof(struct p_header); 4409b411b363SPhilipp Reisner cmd = NULL; 4410b411b363SPhilipp Reisner } 4411b411b363SPhilipp Reisner } 4412b411b363SPhilipp Reisner 4413b411b363SPhilipp Reisner if (0) { 4414b411b363SPhilipp Reisner reconnect: 4415b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); 4416b411b363SPhilipp Reisner } 4417b411b363SPhilipp Reisner if (0) { 4418b411b363SPhilipp Reisner disconnect: 4419b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4420b411b363SPhilipp Reisner } 4421b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4422b411b363SPhilipp Reisner 4423b411b363SPhilipp Reisner D_ASSERT(mdev->state.conn < C_CONNECTED); 4424b411b363SPhilipp Reisner dev_info(DEV, "asender terminated\n"); 4425b411b363SPhilipp Reisner 4426b411b363SPhilipp Reisner return 0; 4427b411b363SPhilipp Reisner } 4428