Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | drbd_worker.c |
| 3 | |
| 4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
| 5 | |
| 6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. |
| 7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. |
| 8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. |
| 9 | |
| 10 | drbd is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2, or (at your option) |
| 13 | any later version. |
| 14 | |
| 15 | drbd is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with drbd; see the file COPYING. If not, write to |
| 22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 | |
| 24 | */ |
| 25 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 26 | #include <linux/module.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 27 | #include <linux/drbd.h> |
| 28 | #include <linux/sched.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 29 | #include <linux/wait.h> |
| 30 | #include <linux/mm.h> |
| 31 | #include <linux/memcontrol.h> |
| 32 | #include <linux/mm_inline.h> |
| 33 | #include <linux/slab.h> |
| 34 | #include <linux/random.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 35 | #include <linux/string.h> |
| 36 | #include <linux/scatterlist.h> |
| 37 | |
| 38 | #include "drbd_int.h" |
| 39 | #include "drbd_req.h" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 40 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 41 | static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel); |
| 42 | |
| 43 | |
| 44 | |
| 45 | /* defined here: |
| 46 | drbd_md_io_complete |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 47 | drbd_endio_sec |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 48 | drbd_endio_pri |
| 49 | |
| 50 | * more endio handlers: |
| 51 | atodb_endio in drbd_actlog.c |
| 52 | drbd_bm_async_io_complete in drbd_bitmap.c |
| 53 | |
| 54 | * For all these callbacks, note the following: |
| 55 | * The callbacks will be called in irq context by the IDE drivers, |
| 56 | * and in Softirqs/Tasklets/BH context by the SCSI drivers. |
| 57 | * Try to get the locking right :) |
| 58 | * |
| 59 | */ |
| 60 | |
| 61 | |
| 62 | /* About the global_state_lock |
| 63 | Each state transition on an device holds a read lock. In case we have |
| 64 | to evaluate the sync after dependencies, we grab a write lock, because |
| 65 | we need stable states on all devices for that. */ |
| 66 | rwlock_t global_state_lock; |
| 67 | |
| 68 | /* used for synchronous meta data and bitmap IO |
| 69 | * submitted by drbd_md_sync_page_io() |
| 70 | */ |
| 71 | void drbd_md_io_complete(struct bio *bio, int error) |
| 72 | { |
| 73 | struct drbd_md_io *md_io; |
| 74 | |
| 75 | md_io = (struct drbd_md_io *)bio->bi_private; |
| 76 | md_io->error = error; |
| 77 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 78 | complete(&md_io->event); |
| 79 | } |
| 80 | |
| 81 | /* reads on behalf of the partner, |
| 82 | * "submitted" by the receiver |
| 83 | */ |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 84 | void drbd_endio_read_sec_final(struct drbd_epoch_entry *e) __releases(local) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 85 | { |
| 86 | unsigned long flags = 0; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 87 | struct drbd_conf *mdev = e->mdev; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 88 | |
| 89 | D_ASSERT(e->block_id != ID_VACANT); |
| 90 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 91 | spin_lock_irqsave(&mdev->req_lock, flags); |
| 92 | mdev->read_cnt += e->size >> 9; |
| 93 | list_del(&e->w.list); |
| 94 | if (list_empty(&mdev->read_ee)) |
| 95 | wake_up(&mdev->ee_wait); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 96 | if (test_bit(__EE_WAS_ERROR, &e->flags)) |
| 97 | __drbd_chk_io_error(mdev, FALSE); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 98 | spin_unlock_irqrestore(&mdev->req_lock, flags); |
| 99 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 100 | drbd_queue_work(&mdev->data.work, &e->w); |
| 101 | put_ldev(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | /* writes on behalf of the partner, or resync writes, |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 105 | * "submitted" by the receiver, final stage. */ |
| 106 | static void drbd_endio_write_sec_final(struct drbd_epoch_entry *e) __releases(local) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 107 | { |
| 108 | unsigned long flags = 0; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 109 | struct drbd_conf *mdev = e->mdev; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 110 | sector_t e_sector; |
| 111 | int do_wake; |
| 112 | int is_syncer_req; |
| 113 | int do_al_complete_io; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 114 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 115 | D_ASSERT(e->block_id != ID_VACANT); |
| 116 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 117 | /* after we moved e to done_ee, |
| 118 | * we may no longer access it, |
| 119 | * it may be freed/reused already! |
| 120 | * (as soon as we release the req_lock) */ |
| 121 | e_sector = e->sector; |
| 122 | do_al_complete_io = e->flags & EE_CALL_AL_COMPLETE_IO; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 123 | is_syncer_req = is_syncer_block_id(e->block_id); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 124 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 125 | spin_lock_irqsave(&mdev->req_lock, flags); |
| 126 | mdev->writ_cnt += e->size >> 9; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 127 | list_del(&e->w.list); /* has been on active_ee or sync_ee */ |
| 128 | list_add_tail(&e->w.list, &mdev->done_ee); |
| 129 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 130 | /* No hlist_del_init(&e->colision) here, we did not send the Ack yet, |
| 131 | * neither did we wake possibly waiting conflicting requests. |
| 132 | * done from "drbd_process_done_ee" within the appropriate w.cb |
| 133 | * (e_end_block/e_end_resync_block) or from _drbd_clear_done_ee */ |
| 134 | |
| 135 | do_wake = is_syncer_req |
| 136 | ? list_empty(&mdev->sync_ee) |
| 137 | : list_empty(&mdev->active_ee); |
| 138 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 139 | if (test_bit(__EE_WAS_ERROR, &e->flags)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 140 | __drbd_chk_io_error(mdev, FALSE); |
| 141 | spin_unlock_irqrestore(&mdev->req_lock, flags); |
| 142 | |
| 143 | if (is_syncer_req) |
| 144 | drbd_rs_complete_io(mdev, e_sector); |
| 145 | |
| 146 | if (do_wake) |
| 147 | wake_up(&mdev->ee_wait); |
| 148 | |
| 149 | if (do_al_complete_io) |
| 150 | drbd_al_complete_io(mdev, e_sector); |
| 151 | |
| 152 | wake_asender(mdev); |
| 153 | put_ldev(mdev); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 154 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 155 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 156 | /* writes on behalf of the partner, or resync writes, |
| 157 | * "submitted" by the receiver. |
| 158 | */ |
| 159 | void drbd_endio_sec(struct bio *bio, int error) |
| 160 | { |
| 161 | struct drbd_epoch_entry *e = bio->bi_private; |
| 162 | struct drbd_conf *mdev = e->mdev; |
| 163 | int uptodate = bio_flagged(bio, BIO_UPTODATE); |
| 164 | int is_write = bio_data_dir(bio) == WRITE; |
| 165 | |
| 166 | if (error) |
| 167 | dev_warn(DEV, "%s: error=%d s=%llus\n", |
| 168 | is_write ? "write" : "read", error, |
| 169 | (unsigned long long)e->sector); |
| 170 | if (!error && !uptodate) { |
| 171 | dev_warn(DEV, "%s: setting error to -EIO s=%llus\n", |
| 172 | is_write ? "write" : "read", |
| 173 | (unsigned long long)e->sector); |
| 174 | /* strange behavior of some lower level drivers... |
| 175 | * fail the request by clearing the uptodate flag, |
| 176 | * but do not return any error?! */ |
| 177 | error = -EIO; |
| 178 | } |
| 179 | |
| 180 | if (error) |
| 181 | set_bit(__EE_WAS_ERROR, &e->flags); |
| 182 | |
| 183 | bio_put(bio); /* no need for the bio anymore */ |
| 184 | if (atomic_dec_and_test(&e->pending_bios)) { |
| 185 | if (is_write) |
| 186 | drbd_endio_write_sec_final(e); |
| 187 | else |
| 188 | drbd_endio_read_sec_final(e); |
| 189 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | /* read, readA or write requests on R_PRIMARY coming from drbd_make_request |
| 193 | */ |
| 194 | void drbd_endio_pri(struct bio *bio, int error) |
| 195 | { |
Lars Ellenberg | a115413 | 2010-11-13 20:42:29 +0100 | [diff] [blame] | 196 | unsigned long flags; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 197 | struct drbd_request *req = bio->bi_private; |
| 198 | struct drbd_conf *mdev = req->mdev; |
Lars Ellenberg | a115413 | 2010-11-13 20:42:29 +0100 | [diff] [blame] | 199 | struct bio_and_error m; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 200 | enum drbd_req_event what; |
| 201 | int uptodate = bio_flagged(bio, BIO_UPTODATE); |
| 202 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 203 | if (!error && !uptodate) { |
| 204 | dev_warn(DEV, "p %s: setting error to -EIO\n", |
| 205 | bio_data_dir(bio) == WRITE ? "write" : "read"); |
| 206 | /* strange behavior of some lower level drivers... |
| 207 | * fail the request by clearing the uptodate flag, |
| 208 | * but do not return any error?! */ |
| 209 | error = -EIO; |
| 210 | } |
| 211 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 212 | /* to avoid recursion in __req_mod */ |
| 213 | if (unlikely(error)) { |
| 214 | what = (bio_data_dir(bio) == WRITE) |
| 215 | ? write_completed_with_error |
Lars Ellenberg | 5c3c7e6 | 2010-04-10 02:10:09 +0200 | [diff] [blame] | 216 | : (bio_rw(bio) == READ) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 217 | ? read_completed_with_error |
| 218 | : read_ahead_completed_with_error; |
| 219 | } else |
| 220 | what = completed_ok; |
| 221 | |
| 222 | bio_put(req->private_bio); |
| 223 | req->private_bio = ERR_PTR(error); |
| 224 | |
Lars Ellenberg | a115413 | 2010-11-13 20:42:29 +0100 | [diff] [blame] | 225 | /* not req_mod(), we need irqsave here! */ |
| 226 | spin_lock_irqsave(&mdev->req_lock, flags); |
| 227 | __req_mod(req, what, &m); |
| 228 | spin_unlock_irqrestore(&mdev->req_lock, flags); |
| 229 | |
| 230 | if (m.bio) |
| 231 | complete_master_bio(mdev, &m); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 232 | } |
| 233 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 234 | int w_read_retry_remote(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 235 | { |
| 236 | struct drbd_request *req = container_of(w, struct drbd_request, w); |
| 237 | |
| 238 | /* We should not detach for read io-error, |
| 239 | * but try to WRITE the P_DATA_REPLY to the failed location, |
| 240 | * to give the disk the chance to relocate that block */ |
| 241 | |
| 242 | spin_lock_irq(&mdev->req_lock); |
Lars Ellenberg | d255e5f | 2010-05-27 09:45:45 +0200 | [diff] [blame] | 243 | if (cancel || mdev->state.pdsk != D_UP_TO_DATE) { |
| 244 | _req_mod(req, read_retry_remote_canceled); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 245 | spin_unlock_irq(&mdev->req_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 246 | return 1; |
| 247 | } |
| 248 | spin_unlock_irq(&mdev->req_lock); |
| 249 | |
| 250 | return w_send_read_req(mdev, w, 0); |
| 251 | } |
| 252 | |
| 253 | int w_resync_inactive(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 254 | { |
| 255 | ERR_IF(cancel) return 1; |
| 256 | dev_err(DEV, "resync inactive, but callback triggered??\n"); |
| 257 | return 1; /* Simply ignore this! */ |
| 258 | } |
| 259 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 260 | void drbd_csum_ee(struct drbd_conf *mdev, struct crypto_hash *tfm, struct drbd_epoch_entry *e, void *digest) |
| 261 | { |
| 262 | struct hash_desc desc; |
| 263 | struct scatterlist sg; |
| 264 | struct page *page = e->pages; |
| 265 | struct page *tmp; |
| 266 | unsigned len; |
| 267 | |
| 268 | desc.tfm = tfm; |
| 269 | desc.flags = 0; |
| 270 | |
| 271 | sg_init_table(&sg, 1); |
| 272 | crypto_hash_init(&desc); |
| 273 | |
| 274 | while ((tmp = page_chain_next(page))) { |
| 275 | /* all but the last page will be fully used */ |
| 276 | sg_set_page(&sg, page, PAGE_SIZE, 0); |
| 277 | crypto_hash_update(&desc, &sg, sg.length); |
| 278 | page = tmp; |
| 279 | } |
| 280 | /* and now the last, possibly only partially used page */ |
| 281 | len = e->size & (PAGE_SIZE - 1); |
| 282 | sg_set_page(&sg, page, len ?: PAGE_SIZE, 0); |
| 283 | crypto_hash_update(&desc, &sg, sg.length); |
| 284 | crypto_hash_final(&desc, digest); |
| 285 | } |
| 286 | |
| 287 | void drbd_csum_bio(struct drbd_conf *mdev, struct crypto_hash *tfm, struct bio *bio, void *digest) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 288 | { |
| 289 | struct hash_desc desc; |
| 290 | struct scatterlist sg; |
| 291 | struct bio_vec *bvec; |
| 292 | int i; |
| 293 | |
| 294 | desc.tfm = tfm; |
| 295 | desc.flags = 0; |
| 296 | |
| 297 | sg_init_table(&sg, 1); |
| 298 | crypto_hash_init(&desc); |
| 299 | |
| 300 | __bio_for_each_segment(bvec, bio, i, 0) { |
| 301 | sg_set_page(&sg, bvec->bv_page, bvec->bv_len, bvec->bv_offset); |
| 302 | crypto_hash_update(&desc, &sg, sg.length); |
| 303 | } |
| 304 | crypto_hash_final(&desc, digest); |
| 305 | } |
| 306 | |
| 307 | static int w_e_send_csum(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 308 | { |
| 309 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); |
| 310 | int digest_size; |
| 311 | void *digest; |
| 312 | int ok; |
| 313 | |
| 314 | D_ASSERT(e->block_id == DRBD_MAGIC + 0xbeef); |
| 315 | |
| 316 | if (unlikely(cancel)) { |
| 317 | drbd_free_ee(mdev, e); |
| 318 | return 1; |
| 319 | } |
| 320 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 321 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 322 | digest_size = crypto_hash_digestsize(mdev->csums_tfm); |
| 323 | digest = kmalloc(digest_size, GFP_NOIO); |
| 324 | if (digest) { |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 325 | drbd_csum_ee(mdev, mdev->csums_tfm, e, digest); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 326 | |
| 327 | inc_rs_pending(mdev); |
| 328 | ok = drbd_send_drequest_csum(mdev, |
| 329 | e->sector, |
| 330 | e->size, |
| 331 | digest, |
| 332 | digest_size, |
| 333 | P_CSUM_RS_REQUEST); |
| 334 | kfree(digest); |
| 335 | } else { |
| 336 | dev_err(DEV, "kmalloc() of digest failed.\n"); |
| 337 | ok = 0; |
| 338 | } |
| 339 | } else |
| 340 | ok = 1; |
| 341 | |
| 342 | drbd_free_ee(mdev, e); |
| 343 | |
| 344 | if (unlikely(!ok)) |
| 345 | dev_err(DEV, "drbd_send_drequest(..., csum) failed\n"); |
| 346 | return ok; |
| 347 | } |
| 348 | |
| 349 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) |
| 350 | |
| 351 | static int read_for_csum(struct drbd_conf *mdev, sector_t sector, int size) |
| 352 | { |
| 353 | struct drbd_epoch_entry *e; |
| 354 | |
| 355 | if (!get_ldev(mdev)) |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 356 | return -EIO; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 357 | |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 358 | if (drbd_rs_should_slow_down(mdev)) |
| 359 | goto defer; |
| 360 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 361 | /* GFP_TRY, because if there is no memory available right now, this may |
| 362 | * be rescheduled for later. It is "only" background resync, after all. */ |
| 363 | e = drbd_alloc_ee(mdev, DRBD_MAGIC+0xbeef, sector, size, GFP_TRY); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 364 | if (!e) |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 365 | goto defer; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 366 | |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 367 | e->w.cb = w_e_send_csum; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 368 | spin_lock_irq(&mdev->req_lock); |
| 369 | list_add(&e->w.list, &mdev->read_ee); |
| 370 | spin_unlock_irq(&mdev->req_lock); |
| 371 | |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 372 | atomic_add(size >> 9, &mdev->rs_sect_ev); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 373 | if (drbd_submit_ee(mdev, e, READ, DRBD_FAULT_RS_RD) == 0) |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 374 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 375 | |
Lars Ellenberg | 22cc37a | 2010-09-14 20:40:41 +0200 | [diff] [blame] | 376 | /* drbd_submit_ee currently fails for one reason only: |
| 377 | * not being able to allocate enough bios. |
| 378 | * Is dropping the connection going to help? */ |
| 379 | spin_lock_irq(&mdev->req_lock); |
| 380 | list_del(&e->w.list); |
| 381 | spin_unlock_irq(&mdev->req_lock); |
| 382 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 383 | drbd_free_ee(mdev, e); |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 384 | defer: |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 385 | put_ldev(mdev); |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 386 | return -EAGAIN; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | void resync_timer_fn(unsigned long data) |
| 390 | { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 391 | struct drbd_conf *mdev = (struct drbd_conf *) data; |
| 392 | int queue; |
| 393 | |
Philipp Reisner | 63106d3 | 2010-09-01 15:47:15 +0200 | [diff] [blame] | 394 | queue = 1; |
| 395 | switch (mdev->state.conn) { |
| 396 | case C_VERIFY_S: |
| 397 | mdev->resync_work.cb = w_make_ov_request; |
| 398 | break; |
| 399 | case C_SYNC_TARGET: |
| 400 | mdev->resync_work.cb = w_make_resync_request; |
| 401 | break; |
| 402 | default: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 403 | queue = 0; |
| 404 | mdev->resync_work.cb = w_resync_inactive; |
| 405 | } |
| 406 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 407 | /* harmless race: list_empty outside data.work.q_lock */ |
| 408 | if (list_empty(&mdev->resync_work.list) && queue) |
| 409 | drbd_queue_work(&mdev->data.work, &mdev->resync_work); |
| 410 | } |
| 411 | |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 412 | static void fifo_set(struct fifo_buffer *fb, int value) |
| 413 | { |
| 414 | int i; |
| 415 | |
| 416 | for (i = 0; i < fb->size; i++) |
Philipp Reisner | f10f262 | 2010-10-05 16:50:17 +0200 | [diff] [blame] | 417 | fb->values[i] = value; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 418 | } |
| 419 | |
| 420 | static int fifo_push(struct fifo_buffer *fb, int value) |
| 421 | { |
| 422 | int ov; |
| 423 | |
| 424 | ov = fb->values[fb->head_index]; |
| 425 | fb->values[fb->head_index++] = value; |
| 426 | |
| 427 | if (fb->head_index >= fb->size) |
| 428 | fb->head_index = 0; |
| 429 | |
| 430 | return ov; |
| 431 | } |
| 432 | |
| 433 | static void fifo_add_val(struct fifo_buffer *fb, int value) |
| 434 | { |
| 435 | int i; |
| 436 | |
| 437 | for (i = 0; i < fb->size; i++) |
| 438 | fb->values[i] += value; |
| 439 | } |
| 440 | |
| 441 | int drbd_rs_controller(struct drbd_conf *mdev) |
| 442 | { |
| 443 | unsigned int sect_in; /* Number of sectors that came in since the last turn */ |
| 444 | unsigned int want; /* The number of sectors we want in the proxy */ |
| 445 | int req_sect; /* Number of sectors to request in this turn */ |
| 446 | int correction; /* Number of sectors more we need in the proxy*/ |
| 447 | int cps; /* correction per invocation of drbd_rs_controller() */ |
| 448 | int steps; /* Number of time steps to plan ahead */ |
| 449 | int curr_corr; |
| 450 | int max_sect; |
| 451 | |
| 452 | sect_in = atomic_xchg(&mdev->rs_sect_in, 0); /* Number of sectors that came in */ |
| 453 | mdev->rs_in_flight -= sect_in; |
| 454 | |
| 455 | spin_lock(&mdev->peer_seq_lock); /* get an atomic view on mdev->rs_plan_s */ |
| 456 | |
| 457 | steps = mdev->rs_plan_s.size; /* (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; */ |
| 458 | |
| 459 | if (mdev->rs_in_flight + sect_in == 0) { /* At start of resync */ |
| 460 | want = ((mdev->sync_conf.rate * 2 * SLEEP_TIME) / HZ) * steps; |
| 461 | } else { /* normal path */ |
| 462 | want = mdev->sync_conf.c_fill_target ? mdev->sync_conf.c_fill_target : |
| 463 | sect_in * mdev->sync_conf.c_delay_target * HZ / (SLEEP_TIME * 10); |
| 464 | } |
| 465 | |
| 466 | correction = want - mdev->rs_in_flight - mdev->rs_planed; |
| 467 | |
| 468 | /* Plan ahead */ |
| 469 | cps = correction / steps; |
| 470 | fifo_add_val(&mdev->rs_plan_s, cps); |
| 471 | mdev->rs_planed += cps * steps; |
| 472 | |
| 473 | /* What we do in this step */ |
| 474 | curr_corr = fifo_push(&mdev->rs_plan_s, 0); |
| 475 | spin_unlock(&mdev->peer_seq_lock); |
| 476 | mdev->rs_planed -= curr_corr; |
| 477 | |
| 478 | req_sect = sect_in + curr_corr; |
| 479 | if (req_sect < 0) |
| 480 | req_sect = 0; |
| 481 | |
| 482 | max_sect = (mdev->sync_conf.c_max_rate * 2 * SLEEP_TIME) / HZ; |
| 483 | if (req_sect > max_sect) |
| 484 | req_sect = max_sect; |
| 485 | |
| 486 | /* |
| 487 | dev_warn(DEV, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n", |
| 488 | sect_in, mdev->rs_in_flight, want, correction, |
| 489 | steps, cps, mdev->rs_planed, curr_corr, req_sect); |
| 490 | */ |
| 491 | |
| 492 | return req_sect; |
| 493 | } |
| 494 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 495 | int w_make_resync_request(struct drbd_conf *mdev, |
| 496 | struct drbd_work *w, int cancel) |
| 497 | { |
| 498 | unsigned long bit; |
| 499 | sector_t sector; |
| 500 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); |
Lars Ellenberg | bb3d000 | 2010-05-14 19:08:55 +0200 | [diff] [blame] | 501 | int max_segment_size; |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 502 | int number, rollback_i, size, pe, mx; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 503 | int align, queued, sndbuf; |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 504 | int i = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 505 | |
| 506 | if (unlikely(cancel)) |
| 507 | return 1; |
| 508 | |
| 509 | if (unlikely(mdev->state.conn < C_CONNECTED)) { |
| 510 | dev_err(DEV, "Confused in w_make_resync_request()! cstate < Connected"); |
| 511 | return 0; |
| 512 | } |
| 513 | |
| 514 | if (mdev->state.conn != C_SYNC_TARGET) |
| 515 | dev_err(DEV, "%s in w_make_resync_request\n", |
| 516 | drbd_conn_str(mdev->state.conn)); |
| 517 | |
Lars Ellenberg | af85e8e | 2010-10-07 16:07:55 +0200 | [diff] [blame] | 518 | if (mdev->rs_total == 0) { |
| 519 | /* empty resync? */ |
| 520 | drbd_resync_finished(mdev); |
| 521 | return 1; |
| 522 | } |
| 523 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 524 | if (!get_ldev(mdev)) { |
| 525 | /* Since we only need to access mdev->rsync a |
| 526 | get_ldev_if_state(mdev,D_FAILED) would be sufficient, but |
| 527 | to continue resync with a broken disk makes no sense at |
| 528 | all */ |
| 529 | dev_err(DEV, "Disk broke down during resync!\n"); |
| 530 | mdev->resync_work.cb = w_resync_inactive; |
| 531 | return 1; |
| 532 | } |
| 533 | |
Lars Ellenberg | bb3d000 | 2010-05-14 19:08:55 +0200 | [diff] [blame] | 534 | /* starting with drbd 8.3.8, we can handle multi-bio EEs, |
| 535 | * if it should be necessary */ |
Philipp Reisner | 5a75cc7 | 2010-09-09 14:22:21 +0200 | [diff] [blame] | 536 | max_segment_size = |
| 537 | mdev->agreed_pro_version < 94 ? queue_max_segment_size(mdev->rq_queue) : |
| 538 | mdev->agreed_pro_version < 95 ? DRBD_MAX_SIZE_H80_PACKET : DRBD_MAX_SEGMENT_SIZE; |
Lars Ellenberg | bb3d000 | 2010-05-14 19:08:55 +0200 | [diff] [blame] | 539 | |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 540 | if (mdev->rs_plan_s.size) { /* mdev->sync_conf.c_plan_ahead */ |
| 541 | number = drbd_rs_controller(mdev) >> (BM_BLOCK_SHIFT - 9); |
| 542 | mdev->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME; |
| 543 | } else { |
| 544 | mdev->c_sync_rate = mdev->sync_conf.rate; |
| 545 | number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ); |
| 546 | } |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 547 | |
| 548 | /* Throttle resync on lower level disk activity, which may also be |
| 549 | * caused by application IO on Primary/SyncTarget. |
| 550 | * Keep this after the call to drbd_rs_controller, as that assumes |
| 551 | * to be called as precisely as possible every SLEEP_TIME, |
| 552 | * and would be confused otherwise. */ |
| 553 | if (drbd_rs_should_slow_down(mdev)) |
| 554 | goto requeue; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 555 | |
| 556 | mutex_lock(&mdev->data.mutex); |
| 557 | if (mdev->data.socket) |
| 558 | mx = mdev->data.socket->sk->sk_rcvbuf / sizeof(struct p_block_req); |
| 559 | else |
| 560 | mx = 1; |
| 561 | mutex_unlock(&mdev->data.mutex); |
| 562 | |
| 563 | /* For resync rates >160MB/sec, allow more pending RS requests */ |
| 564 | if (number > mx) |
| 565 | mx = number; |
| 566 | |
| 567 | /* Limit the number of pending RS requests to no more than the peer's receive buffer */ |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 568 | pe = atomic_read(&mdev->rs_pending_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 569 | if ((pe + number) > mx) { |
| 570 | number = mx - pe; |
| 571 | } |
| 572 | |
| 573 | for (i = 0; i < number; i++) { |
| 574 | /* Stop generating RS requests, when half of the send buffer is filled */ |
| 575 | mutex_lock(&mdev->data.mutex); |
| 576 | if (mdev->data.socket) { |
| 577 | queued = mdev->data.socket->sk->sk_wmem_queued; |
| 578 | sndbuf = mdev->data.socket->sk->sk_sndbuf; |
| 579 | } else { |
| 580 | queued = 1; |
| 581 | sndbuf = 0; |
| 582 | } |
| 583 | mutex_unlock(&mdev->data.mutex); |
| 584 | if (queued > sndbuf / 2) |
| 585 | goto requeue; |
| 586 | |
| 587 | next_sector: |
| 588 | size = BM_BLOCK_SIZE; |
| 589 | bit = drbd_bm_find_next(mdev, mdev->bm_resync_fo); |
| 590 | |
| 591 | if (bit == -1UL) { |
| 592 | mdev->bm_resync_fo = drbd_bm_bits(mdev); |
| 593 | mdev->resync_work.cb = w_resync_inactive; |
| 594 | put_ldev(mdev); |
| 595 | return 1; |
| 596 | } |
| 597 | |
| 598 | sector = BM_BIT_TO_SECT(bit); |
| 599 | |
| 600 | if (drbd_try_rs_begin_io(mdev, sector)) { |
| 601 | mdev->bm_resync_fo = bit; |
| 602 | goto requeue; |
| 603 | } |
| 604 | mdev->bm_resync_fo = bit + 1; |
| 605 | |
| 606 | if (unlikely(drbd_bm_test_bit(mdev, bit) == 0)) { |
| 607 | drbd_rs_complete_io(mdev, sector); |
| 608 | goto next_sector; |
| 609 | } |
| 610 | |
| 611 | #if DRBD_MAX_SEGMENT_SIZE > BM_BLOCK_SIZE |
| 612 | /* try to find some adjacent bits. |
| 613 | * we stop if we have already the maximum req size. |
| 614 | * |
| 615 | * Additionally always align bigger requests, in order to |
| 616 | * be prepared for all stripe sizes of software RAIDs. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 617 | */ |
| 618 | align = 1; |
Philipp Reisner | d207450 | 2010-07-22 15:27:27 +0200 | [diff] [blame] | 619 | rollback_i = i; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 620 | for (;;) { |
| 621 | if (size + BM_BLOCK_SIZE > max_segment_size) |
| 622 | break; |
| 623 | |
| 624 | /* Be always aligned */ |
| 625 | if (sector & ((1<<(align+3))-1)) |
| 626 | break; |
| 627 | |
| 628 | /* do not cross extent boundaries */ |
| 629 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) |
| 630 | break; |
| 631 | /* now, is it actually dirty, after all? |
| 632 | * caution, drbd_bm_test_bit is tri-state for some |
| 633 | * obscure reason; ( b == 0 ) would get the out-of-band |
| 634 | * only accidentally right because of the "oddly sized" |
| 635 | * adjustment below */ |
| 636 | if (drbd_bm_test_bit(mdev, bit+1) != 1) |
| 637 | break; |
| 638 | bit++; |
| 639 | size += BM_BLOCK_SIZE; |
| 640 | if ((BM_BLOCK_SIZE << align) <= size) |
| 641 | align++; |
| 642 | i++; |
| 643 | } |
| 644 | /* if we merged some, |
| 645 | * reset the offset to start the next drbd_bm_find_next from */ |
| 646 | if (size > BM_BLOCK_SIZE) |
| 647 | mdev->bm_resync_fo = bit + 1; |
| 648 | #endif |
| 649 | |
| 650 | /* adjust very last sectors, in case we are oddly sized */ |
| 651 | if (sector + (size>>9) > capacity) |
| 652 | size = (capacity-sector)<<9; |
| 653 | if (mdev->agreed_pro_version >= 89 && mdev->csums_tfm) { |
| 654 | switch (read_for_csum(mdev, sector, size)) { |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 655 | case -EIO: /* Disk failure */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 656 | put_ldev(mdev); |
| 657 | return 0; |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 658 | case -EAGAIN: /* allocation failed, or ldev busy */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 659 | drbd_rs_complete_io(mdev, sector); |
| 660 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); |
Philipp Reisner | d207450 | 2010-07-22 15:27:27 +0200 | [diff] [blame] | 661 | i = rollback_i; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 662 | goto requeue; |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 663 | case 0: |
| 664 | /* everything ok */ |
| 665 | break; |
| 666 | default: |
| 667 | BUG(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 668 | } |
| 669 | } else { |
| 670 | inc_rs_pending(mdev); |
| 671 | if (!drbd_send_drequest(mdev, P_RS_DATA_REQUEST, |
| 672 | sector, size, ID_SYNCER)) { |
| 673 | dev_err(DEV, "drbd_send_drequest() failed, aborting...\n"); |
| 674 | dec_rs_pending(mdev); |
| 675 | put_ldev(mdev); |
| 676 | return 0; |
| 677 | } |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | if (mdev->bm_resync_fo >= drbd_bm_bits(mdev)) { |
| 682 | /* last syncer _request_ was sent, |
| 683 | * but the P_RS_DATA_REPLY not yet received. sync will end (and |
| 684 | * next sync group will resume), as soon as we receive the last |
| 685 | * resync data block, and the last bit is cleared. |
| 686 | * until then resync "work" is "inactive" ... |
| 687 | */ |
| 688 | mdev->resync_work.cb = w_resync_inactive; |
| 689 | put_ldev(mdev); |
| 690 | return 1; |
| 691 | } |
| 692 | |
| 693 | requeue: |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 694 | mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 695 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); |
| 696 | put_ldev(mdev); |
| 697 | return 1; |
| 698 | } |
| 699 | |
| 700 | static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 701 | { |
| 702 | int number, i, size; |
| 703 | sector_t sector; |
| 704 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); |
| 705 | |
| 706 | if (unlikely(cancel)) |
| 707 | return 1; |
| 708 | |
| 709 | if (unlikely(mdev->state.conn < C_CONNECTED)) { |
| 710 | dev_err(DEV, "Confused in w_make_ov_request()! cstate < Connected"); |
| 711 | return 0; |
| 712 | } |
| 713 | |
| 714 | number = SLEEP_TIME*mdev->sync_conf.rate / ((BM_BLOCK_SIZE/1024)*HZ); |
| 715 | if (atomic_read(&mdev->rs_pending_cnt) > number) |
| 716 | goto requeue; |
| 717 | |
| 718 | number -= atomic_read(&mdev->rs_pending_cnt); |
| 719 | |
| 720 | sector = mdev->ov_position; |
| 721 | for (i = 0; i < number; i++) { |
| 722 | if (sector >= capacity) { |
| 723 | mdev->resync_work.cb = w_resync_inactive; |
| 724 | return 1; |
| 725 | } |
| 726 | |
| 727 | size = BM_BLOCK_SIZE; |
| 728 | |
| 729 | if (drbd_try_rs_begin_io(mdev, sector)) { |
| 730 | mdev->ov_position = sector; |
| 731 | goto requeue; |
| 732 | } |
| 733 | |
| 734 | if (sector + (size>>9) > capacity) |
| 735 | size = (capacity-sector)<<9; |
| 736 | |
| 737 | inc_rs_pending(mdev); |
| 738 | if (!drbd_send_ov_request(mdev, sector, size)) { |
| 739 | dec_rs_pending(mdev); |
| 740 | return 0; |
| 741 | } |
| 742 | sector += BM_SECT_PER_BIT; |
| 743 | } |
| 744 | mdev->ov_position = sector; |
| 745 | |
| 746 | requeue: |
| 747 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); |
| 748 | return 1; |
| 749 | } |
| 750 | |
| 751 | |
| 752 | int w_ov_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 753 | { |
| 754 | kfree(w); |
| 755 | ov_oos_print(mdev); |
| 756 | drbd_resync_finished(mdev); |
| 757 | |
| 758 | return 1; |
| 759 | } |
| 760 | |
| 761 | static int w_resync_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 762 | { |
| 763 | kfree(w); |
| 764 | |
| 765 | drbd_resync_finished(mdev); |
| 766 | |
| 767 | return 1; |
| 768 | } |
| 769 | |
Lars Ellenberg | af85e8e | 2010-10-07 16:07:55 +0200 | [diff] [blame] | 770 | static void ping_peer(struct drbd_conf *mdev) |
| 771 | { |
| 772 | clear_bit(GOT_PING_ACK, &mdev->flags); |
| 773 | request_ping(mdev); |
| 774 | wait_event(mdev->misc_wait, |
| 775 | test_bit(GOT_PING_ACK, &mdev->flags) || mdev->state.conn < C_CONNECTED); |
| 776 | } |
| 777 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 778 | int drbd_resync_finished(struct drbd_conf *mdev) |
| 779 | { |
| 780 | unsigned long db, dt, dbdt; |
| 781 | unsigned long n_oos; |
| 782 | union drbd_state os, ns; |
| 783 | struct drbd_work *w; |
| 784 | char *khelper_cmd = NULL; |
| 785 | |
| 786 | /* Remove all elements from the resync LRU. Since future actions |
| 787 | * might set bits in the (main) bitmap, then the entries in the |
| 788 | * resync LRU would be wrong. */ |
| 789 | if (drbd_rs_del_all(mdev)) { |
| 790 | /* In case this is not possible now, most probably because |
| 791 | * there are P_RS_DATA_REPLY Packets lingering on the worker's |
| 792 | * queue (or even the read operations for those packets |
| 793 | * is not finished by now). Retry in 100ms. */ |
| 794 | |
| 795 | drbd_kick_lo(mdev); |
| 796 | __set_current_state(TASK_INTERRUPTIBLE); |
| 797 | schedule_timeout(HZ / 10); |
| 798 | w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC); |
| 799 | if (w) { |
| 800 | w->cb = w_resync_finished; |
| 801 | drbd_queue_work(&mdev->data.work, w); |
| 802 | return 1; |
| 803 | } |
| 804 | dev_err(DEV, "Warn failed to drbd_rs_del_all() and to kmalloc(w).\n"); |
| 805 | } |
| 806 | |
| 807 | dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ; |
| 808 | if (dt <= 0) |
| 809 | dt = 1; |
| 810 | db = mdev->rs_total; |
| 811 | dbdt = Bit2KB(db/dt); |
| 812 | mdev->rs_paused /= HZ; |
| 813 | |
| 814 | if (!get_ldev(mdev)) |
| 815 | goto out; |
| 816 | |
Lars Ellenberg | af85e8e | 2010-10-07 16:07:55 +0200 | [diff] [blame] | 817 | ping_peer(mdev); |
| 818 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 819 | spin_lock_irq(&mdev->req_lock); |
| 820 | os = mdev->state; |
| 821 | |
| 822 | /* This protects us against multiple calls (that can happen in the presence |
| 823 | of application IO), and against connectivity loss just before we arrive here. */ |
| 824 | if (os.conn <= C_CONNECTED) |
| 825 | goto out_unlock; |
| 826 | |
| 827 | ns = os; |
| 828 | ns.conn = C_CONNECTED; |
| 829 | |
| 830 | dev_info(DEV, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", |
| 831 | (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) ? |
| 832 | "Online verify " : "Resync", |
| 833 | dt + mdev->rs_paused, mdev->rs_paused, dbdt); |
| 834 | |
| 835 | n_oos = drbd_bm_total_weight(mdev); |
| 836 | |
| 837 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { |
| 838 | if (n_oos) { |
| 839 | dev_alert(DEV, "Online verify found %lu %dk block out of sync!\n", |
| 840 | n_oos, Bit2KB(1)); |
| 841 | khelper_cmd = "out-of-sync"; |
| 842 | } |
| 843 | } else { |
| 844 | D_ASSERT((n_oos - mdev->rs_failed) == 0); |
| 845 | |
| 846 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) |
| 847 | khelper_cmd = "after-resync-target"; |
| 848 | |
| 849 | if (mdev->csums_tfm && mdev->rs_total) { |
| 850 | const unsigned long s = mdev->rs_same_csum; |
| 851 | const unsigned long t = mdev->rs_total; |
| 852 | const int ratio = |
| 853 | (t == 0) ? 0 : |
| 854 | (t < 100000) ? ((s*100)/t) : (s/(t/100)); |
| 855 | dev_info(DEV, "%u %% had equal check sums, eliminated: %luK; " |
| 856 | "transferred %luK total %luK\n", |
| 857 | ratio, |
| 858 | Bit2KB(mdev->rs_same_csum), |
| 859 | Bit2KB(mdev->rs_total - mdev->rs_same_csum), |
| 860 | Bit2KB(mdev->rs_total)); |
| 861 | } |
| 862 | } |
| 863 | |
| 864 | if (mdev->rs_failed) { |
| 865 | dev_info(DEV, " %lu failed blocks\n", mdev->rs_failed); |
| 866 | |
| 867 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { |
| 868 | ns.disk = D_INCONSISTENT; |
| 869 | ns.pdsk = D_UP_TO_DATE; |
| 870 | } else { |
| 871 | ns.disk = D_UP_TO_DATE; |
| 872 | ns.pdsk = D_INCONSISTENT; |
| 873 | } |
| 874 | } else { |
| 875 | ns.disk = D_UP_TO_DATE; |
| 876 | ns.pdsk = D_UP_TO_DATE; |
| 877 | |
| 878 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { |
| 879 | if (mdev->p_uuid) { |
| 880 | int i; |
| 881 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) |
| 882 | _drbd_uuid_set(mdev, i, mdev->p_uuid[i]); |
| 883 | drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_CURRENT]); |
| 884 | _drbd_uuid_set(mdev, UI_CURRENT, mdev->p_uuid[UI_CURRENT]); |
| 885 | } else { |
| 886 | dev_err(DEV, "mdev->p_uuid is NULL! BUG\n"); |
| 887 | } |
| 888 | } |
| 889 | |
| 890 | drbd_uuid_set_bm(mdev, 0UL); |
| 891 | |
| 892 | if (mdev->p_uuid) { |
| 893 | /* Now the two UUID sets are equal, update what we |
| 894 | * know of the peer. */ |
| 895 | int i; |
| 896 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) |
| 897 | mdev->p_uuid[i] = mdev->ldev->md.uuid[i]; |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); |
| 902 | out_unlock: |
| 903 | spin_unlock_irq(&mdev->req_lock); |
| 904 | put_ldev(mdev); |
| 905 | out: |
| 906 | mdev->rs_total = 0; |
| 907 | mdev->rs_failed = 0; |
| 908 | mdev->rs_paused = 0; |
| 909 | mdev->ov_start_sector = 0; |
| 910 | |
Lars Ellenberg | 13d4268 | 2010-10-13 17:37:54 +0200 | [diff] [blame] | 911 | drbd_md_sync(mdev); |
| 912 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 913 | if (test_and_clear_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags)) { |
Lars Ellenberg | bc571b8 | 2010-10-21 18:07:31 +0200 | [diff] [blame] | 914 | dev_info(DEV, "Writing the whole bitmap\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 915 | drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, "write from resync_finished"); |
| 916 | } |
| 917 | |
| 918 | if (khelper_cmd) |
| 919 | drbd_khelper(mdev, khelper_cmd); |
| 920 | |
| 921 | return 1; |
| 922 | } |
| 923 | |
| 924 | /* helper */ |
| 925 | static void move_to_net_ee_or_free(struct drbd_conf *mdev, struct drbd_epoch_entry *e) |
| 926 | { |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 927 | if (drbd_ee_has_active_page(e)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 928 | /* This might happen if sendpage() has not finished */ |
Lars Ellenberg | 78db892 | 2010-09-13 13:27:10 +0200 | [diff] [blame] | 929 | int i = (e->size + PAGE_SIZE -1) >> PAGE_SHIFT; |
Lars Ellenberg | 435f074 | 2010-09-06 12:30:25 +0200 | [diff] [blame] | 930 | atomic_add(i, &mdev->pp_in_use_by_net); |
| 931 | atomic_sub(i, &mdev->pp_in_use); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 932 | spin_lock_irq(&mdev->req_lock); |
| 933 | list_add_tail(&e->w.list, &mdev->net_ee); |
| 934 | spin_unlock_irq(&mdev->req_lock); |
Lars Ellenberg | 435f074 | 2010-09-06 12:30:25 +0200 | [diff] [blame] | 935 | wake_up(&drbd_pp_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 936 | } else |
| 937 | drbd_free_ee(mdev, e); |
| 938 | } |
| 939 | |
| 940 | /** |
| 941 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST |
| 942 | * @mdev: DRBD device. |
| 943 | * @w: work object. |
| 944 | * @cancel: The connection will be closed anyways |
| 945 | */ |
| 946 | int w_e_end_data_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 947 | { |
| 948 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); |
| 949 | int ok; |
| 950 | |
| 951 | if (unlikely(cancel)) { |
| 952 | drbd_free_ee(mdev, e); |
| 953 | dec_unacked(mdev); |
| 954 | return 1; |
| 955 | } |
| 956 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 957 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 958 | ok = drbd_send_block(mdev, P_DATA_REPLY, e); |
| 959 | } else { |
| 960 | if (__ratelimit(&drbd_ratelimit_state)) |
| 961 | dev_err(DEV, "Sending NegDReply. sector=%llus.\n", |
| 962 | (unsigned long long)e->sector); |
| 963 | |
| 964 | ok = drbd_send_ack(mdev, P_NEG_DREPLY, e); |
| 965 | } |
| 966 | |
| 967 | dec_unacked(mdev); |
| 968 | |
| 969 | move_to_net_ee_or_free(mdev, e); |
| 970 | |
| 971 | if (unlikely(!ok)) |
| 972 | dev_err(DEV, "drbd_send_block() failed\n"); |
| 973 | return ok; |
| 974 | } |
| 975 | |
| 976 | /** |
| 977 | * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUESTRS |
| 978 | * @mdev: DRBD device. |
| 979 | * @w: work object. |
| 980 | * @cancel: The connection will be closed anyways |
| 981 | */ |
| 982 | int w_e_end_rsdata_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 983 | { |
| 984 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); |
| 985 | int ok; |
| 986 | |
| 987 | if (unlikely(cancel)) { |
| 988 | drbd_free_ee(mdev, e); |
| 989 | dec_unacked(mdev); |
| 990 | return 1; |
| 991 | } |
| 992 | |
| 993 | if (get_ldev_if_state(mdev, D_FAILED)) { |
| 994 | drbd_rs_complete_io(mdev, e->sector); |
| 995 | put_ldev(mdev); |
| 996 | } |
| 997 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 998 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 999 | if (likely(mdev->state.pdsk >= D_INCONSISTENT)) { |
| 1000 | inc_rs_pending(mdev); |
| 1001 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); |
| 1002 | } else { |
| 1003 | if (__ratelimit(&drbd_ratelimit_state)) |
| 1004 | dev_err(DEV, "Not sending RSDataReply, " |
| 1005 | "partner DISKLESS!\n"); |
| 1006 | ok = 1; |
| 1007 | } |
| 1008 | } else { |
| 1009 | if (__ratelimit(&drbd_ratelimit_state)) |
| 1010 | dev_err(DEV, "Sending NegRSDReply. sector %llus.\n", |
| 1011 | (unsigned long long)e->sector); |
| 1012 | |
| 1013 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); |
| 1014 | |
| 1015 | /* update resync data with failure */ |
| 1016 | drbd_rs_failed_io(mdev, e->sector, e->size); |
| 1017 | } |
| 1018 | |
| 1019 | dec_unacked(mdev); |
| 1020 | |
| 1021 | move_to_net_ee_or_free(mdev, e); |
| 1022 | |
| 1023 | if (unlikely(!ok)) |
| 1024 | dev_err(DEV, "drbd_send_block() failed\n"); |
| 1025 | return ok; |
| 1026 | } |
| 1027 | |
| 1028 | int w_e_end_csum_rs_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 1029 | { |
| 1030 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); |
| 1031 | struct digest_info *di; |
| 1032 | int digest_size; |
| 1033 | void *digest = NULL; |
| 1034 | int ok, eq = 0; |
| 1035 | |
| 1036 | if (unlikely(cancel)) { |
| 1037 | drbd_free_ee(mdev, e); |
| 1038 | dec_unacked(mdev); |
| 1039 | return 1; |
| 1040 | } |
| 1041 | |
Lars Ellenberg | 1d53f09 | 2010-09-05 01:13:24 +0200 | [diff] [blame] | 1042 | if (get_ldev(mdev)) { |
| 1043 | drbd_rs_complete_io(mdev, e->sector); |
| 1044 | put_ldev(mdev); |
| 1045 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1046 | |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 1047 | di = e->digest; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1048 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1049 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1050 | /* quick hack to try to avoid a race against reconfiguration. |
| 1051 | * a real fix would be much more involved, |
| 1052 | * introducing more locking mechanisms */ |
| 1053 | if (mdev->csums_tfm) { |
| 1054 | digest_size = crypto_hash_digestsize(mdev->csums_tfm); |
| 1055 | D_ASSERT(digest_size == di->digest_size); |
| 1056 | digest = kmalloc(digest_size, GFP_NOIO); |
| 1057 | } |
| 1058 | if (digest) { |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1059 | drbd_csum_ee(mdev, mdev->csums_tfm, e, digest); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1060 | eq = !memcmp(digest, di->digest, digest_size); |
| 1061 | kfree(digest); |
| 1062 | } |
| 1063 | |
| 1064 | if (eq) { |
| 1065 | drbd_set_in_sync(mdev, e->sector, e->size); |
Lars Ellenberg | 676396d | 2010-03-03 02:08:22 +0100 | [diff] [blame] | 1066 | /* rs_same_csums unit is BM_BLOCK_SIZE */ |
| 1067 | mdev->rs_same_csum += e->size >> BM_BLOCK_SHIFT; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1068 | ok = drbd_send_ack(mdev, P_RS_IS_IN_SYNC, e); |
| 1069 | } else { |
| 1070 | inc_rs_pending(mdev); |
Philipp Reisner | 204bba9 | 2010-08-23 16:17:13 +0200 | [diff] [blame] | 1071 | e->block_id = ID_SYNCER; /* By setting block_id, digest pointer becomes invalid! */ |
| 1072 | e->flags &= ~EE_HAS_DIGEST; /* This e no longer has a digest pointer */ |
| 1073 | kfree(di); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1074 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); |
| 1075 | } |
| 1076 | } else { |
| 1077 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); |
| 1078 | if (__ratelimit(&drbd_ratelimit_state)) |
| 1079 | dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); |
| 1080 | } |
| 1081 | |
| 1082 | dec_unacked(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1083 | move_to_net_ee_or_free(mdev, e); |
| 1084 | |
| 1085 | if (unlikely(!ok)) |
| 1086 | dev_err(DEV, "drbd_send_block/ack() failed\n"); |
| 1087 | return ok; |
| 1088 | } |
| 1089 | |
| 1090 | int w_e_end_ov_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 1091 | { |
| 1092 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); |
| 1093 | int digest_size; |
| 1094 | void *digest; |
| 1095 | int ok = 1; |
| 1096 | |
| 1097 | if (unlikely(cancel)) |
| 1098 | goto out; |
| 1099 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1100 | if (unlikely((e->flags & EE_WAS_ERROR) != 0)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1101 | goto out; |
| 1102 | |
| 1103 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); |
| 1104 | /* FIXME if this allocation fails, online verify will not terminate! */ |
| 1105 | digest = kmalloc(digest_size, GFP_NOIO); |
| 1106 | if (digest) { |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1107 | drbd_csum_ee(mdev, mdev->verify_tfm, e, digest); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1108 | inc_rs_pending(mdev); |
| 1109 | ok = drbd_send_drequest_csum(mdev, e->sector, e->size, |
| 1110 | digest, digest_size, P_OV_REPLY); |
| 1111 | if (!ok) |
| 1112 | dec_rs_pending(mdev); |
| 1113 | kfree(digest); |
| 1114 | } |
| 1115 | |
| 1116 | out: |
| 1117 | drbd_free_ee(mdev, e); |
| 1118 | |
| 1119 | dec_unacked(mdev); |
| 1120 | |
| 1121 | return ok; |
| 1122 | } |
| 1123 | |
| 1124 | void drbd_ov_oos_found(struct drbd_conf *mdev, sector_t sector, int size) |
| 1125 | { |
| 1126 | if (mdev->ov_last_oos_start + mdev->ov_last_oos_size == sector) { |
| 1127 | mdev->ov_last_oos_size += size>>9; |
| 1128 | } else { |
| 1129 | mdev->ov_last_oos_start = sector; |
| 1130 | mdev->ov_last_oos_size = size>>9; |
| 1131 | } |
| 1132 | drbd_set_out_of_sync(mdev, sector, size); |
| 1133 | set_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags); |
| 1134 | } |
| 1135 | |
| 1136 | int w_e_end_ov_reply(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 1137 | { |
| 1138 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); |
| 1139 | struct digest_info *di; |
| 1140 | int digest_size; |
| 1141 | void *digest; |
| 1142 | int ok, eq = 0; |
| 1143 | |
| 1144 | if (unlikely(cancel)) { |
| 1145 | drbd_free_ee(mdev, e); |
| 1146 | dec_unacked(mdev); |
| 1147 | return 1; |
| 1148 | } |
| 1149 | |
| 1150 | /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all |
| 1151 | * the resync lru has been cleaned up already */ |
Lars Ellenberg | 1d53f09 | 2010-09-05 01:13:24 +0200 | [diff] [blame] | 1152 | if (get_ldev(mdev)) { |
| 1153 | drbd_rs_complete_io(mdev, e->sector); |
| 1154 | put_ldev(mdev); |
| 1155 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1156 | |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 1157 | di = e->digest; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1158 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1159 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1160 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); |
| 1161 | digest = kmalloc(digest_size, GFP_NOIO); |
| 1162 | if (digest) { |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1163 | drbd_csum_ee(mdev, mdev->verify_tfm, e, digest); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1164 | |
| 1165 | D_ASSERT(digest_size == di->digest_size); |
| 1166 | eq = !memcmp(digest, di->digest, digest_size); |
| 1167 | kfree(digest); |
| 1168 | } |
| 1169 | } else { |
| 1170 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); |
| 1171 | if (__ratelimit(&drbd_ratelimit_state)) |
| 1172 | dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); |
| 1173 | } |
| 1174 | |
| 1175 | dec_unacked(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1176 | if (!eq) |
| 1177 | drbd_ov_oos_found(mdev, e->sector, e->size); |
| 1178 | else |
| 1179 | ov_oos_print(mdev); |
| 1180 | |
| 1181 | ok = drbd_send_ack_ex(mdev, P_OV_RESULT, e->sector, e->size, |
| 1182 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); |
| 1183 | |
| 1184 | drbd_free_ee(mdev, e); |
| 1185 | |
| 1186 | if (--mdev->ov_left == 0) { |
| 1187 | ov_oos_print(mdev); |
| 1188 | drbd_resync_finished(mdev); |
| 1189 | } |
| 1190 | |
| 1191 | return ok; |
| 1192 | } |
| 1193 | |
| 1194 | int w_prev_work_done(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 1195 | { |
| 1196 | struct drbd_wq_barrier *b = container_of(w, struct drbd_wq_barrier, w); |
| 1197 | complete(&b->done); |
| 1198 | return 1; |
| 1199 | } |
| 1200 | |
| 1201 | int w_send_barrier(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 1202 | { |
| 1203 | struct drbd_tl_epoch *b = container_of(w, struct drbd_tl_epoch, w); |
| 1204 | struct p_barrier *p = &mdev->data.sbuf.barrier; |
| 1205 | int ok = 1; |
| 1206 | |
| 1207 | /* really avoid racing with tl_clear. w.cb may have been referenced |
| 1208 | * just before it was reassigned and re-queued, so double check that. |
| 1209 | * actually, this race was harmless, since we only try to send the |
| 1210 | * barrier packet here, and otherwise do nothing with the object. |
| 1211 | * but compare with the head of w_clear_epoch */ |
| 1212 | spin_lock_irq(&mdev->req_lock); |
| 1213 | if (w->cb != w_send_barrier || mdev->state.conn < C_CONNECTED) |
| 1214 | cancel = 1; |
| 1215 | spin_unlock_irq(&mdev->req_lock); |
| 1216 | if (cancel) |
| 1217 | return 1; |
| 1218 | |
| 1219 | if (!drbd_get_data_sock(mdev)) |
| 1220 | return 0; |
| 1221 | p->barrier = b->br_number; |
| 1222 | /* inc_ap_pending was done where this was queued. |
| 1223 | * dec_ap_pending will be done in got_BarrierAck |
| 1224 | * or (on connection loss) in w_clear_epoch. */ |
| 1225 | ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BARRIER, |
Philipp Reisner | 0b70a13 | 2010-08-20 13:36:10 +0200 | [diff] [blame] | 1226 | (struct p_header80 *)p, sizeof(*p), 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1227 | drbd_put_data_sock(mdev); |
| 1228 | |
| 1229 | return ok; |
| 1230 | } |
| 1231 | |
| 1232 | int w_send_write_hint(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 1233 | { |
| 1234 | if (cancel) |
| 1235 | return 1; |
| 1236 | return drbd_send_short_cmd(mdev, P_UNPLUG_REMOTE); |
| 1237 | } |
| 1238 | |
| 1239 | /** |
| 1240 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request |
| 1241 | * @mdev: DRBD device. |
| 1242 | * @w: work object. |
| 1243 | * @cancel: The connection will be closed anyways |
| 1244 | */ |
| 1245 | int w_send_dblock(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 1246 | { |
| 1247 | struct drbd_request *req = container_of(w, struct drbd_request, w); |
| 1248 | int ok; |
| 1249 | |
| 1250 | if (unlikely(cancel)) { |
| 1251 | req_mod(req, send_canceled); |
| 1252 | return 1; |
| 1253 | } |
| 1254 | |
| 1255 | ok = drbd_send_dblock(mdev, req); |
| 1256 | req_mod(req, ok ? handed_over_to_network : send_failed); |
| 1257 | |
| 1258 | return ok; |
| 1259 | } |
| 1260 | |
| 1261 | /** |
| 1262 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet |
| 1263 | * @mdev: DRBD device. |
| 1264 | * @w: work object. |
| 1265 | * @cancel: The connection will be closed anyways |
| 1266 | */ |
| 1267 | int w_send_read_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 1268 | { |
| 1269 | struct drbd_request *req = container_of(w, struct drbd_request, w); |
| 1270 | int ok; |
| 1271 | |
| 1272 | if (unlikely(cancel)) { |
| 1273 | req_mod(req, send_canceled); |
| 1274 | return 1; |
| 1275 | } |
| 1276 | |
| 1277 | ok = drbd_send_drequest(mdev, P_DATA_REQUEST, req->sector, req->size, |
| 1278 | (unsigned long)req); |
| 1279 | |
| 1280 | if (!ok) { |
| 1281 | /* ?? we set C_TIMEOUT or C_BROKEN_PIPE in drbd_send(); |
| 1282 | * so this is probably redundant */ |
| 1283 | if (mdev->state.conn >= C_CONNECTED) |
| 1284 | drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); |
| 1285 | } |
| 1286 | req_mod(req, ok ? handed_over_to_network : send_failed); |
| 1287 | |
| 1288 | return ok; |
| 1289 | } |
| 1290 | |
Philipp Reisner | 265be2d | 2010-05-31 10:14:17 +0200 | [diff] [blame] | 1291 | int w_restart_disk_io(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
| 1292 | { |
| 1293 | struct drbd_request *req = container_of(w, struct drbd_request, w); |
| 1294 | |
Philipp Reisner | 0778286 | 2010-08-31 12:00:50 +0200 | [diff] [blame] | 1295 | if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG) |
Philipp Reisner | 265be2d | 2010-05-31 10:14:17 +0200 | [diff] [blame] | 1296 | drbd_al_begin_io(mdev, req->sector); |
| 1297 | /* Calling drbd_al_begin_io() out of the worker might deadlocks |
| 1298 | theoretically. Practically it can not deadlock, since this is |
| 1299 | only used when unfreezing IOs. All the extents of the requests |
| 1300 | that made it into the TL are already active */ |
| 1301 | |
| 1302 | drbd_req_make_private_bio(req, req->master_bio); |
| 1303 | req->private_bio->bi_bdev = mdev->ldev->backing_bdev; |
| 1304 | generic_make_request(req->private_bio); |
| 1305 | |
| 1306 | return 1; |
| 1307 | } |
| 1308 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1309 | static int _drbd_may_sync_now(struct drbd_conf *mdev) |
| 1310 | { |
| 1311 | struct drbd_conf *odev = mdev; |
| 1312 | |
| 1313 | while (1) { |
| 1314 | if (odev->sync_conf.after == -1) |
| 1315 | return 1; |
| 1316 | odev = minor_to_mdev(odev->sync_conf.after); |
| 1317 | ERR_IF(!odev) return 1; |
| 1318 | if ((odev->state.conn >= C_SYNC_SOURCE && |
| 1319 | odev->state.conn <= C_PAUSED_SYNC_T) || |
| 1320 | odev->state.aftr_isp || odev->state.peer_isp || |
| 1321 | odev->state.user_isp) |
| 1322 | return 0; |
| 1323 | } |
| 1324 | } |
| 1325 | |
| 1326 | /** |
| 1327 | * _drbd_pause_after() - Pause resync on all devices that may not resync now |
| 1328 | * @mdev: DRBD device. |
| 1329 | * |
| 1330 | * Called from process context only (admin command and after_state_ch). |
| 1331 | */ |
| 1332 | static int _drbd_pause_after(struct drbd_conf *mdev) |
| 1333 | { |
| 1334 | struct drbd_conf *odev; |
| 1335 | int i, rv = 0; |
| 1336 | |
| 1337 | for (i = 0; i < minor_count; i++) { |
| 1338 | odev = minor_to_mdev(i); |
| 1339 | if (!odev) |
| 1340 | continue; |
| 1341 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
| 1342 | continue; |
| 1343 | if (!_drbd_may_sync_now(odev)) |
| 1344 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL) |
| 1345 | != SS_NOTHING_TO_DO); |
| 1346 | } |
| 1347 | |
| 1348 | return rv; |
| 1349 | } |
| 1350 | |
| 1351 | /** |
| 1352 | * _drbd_resume_next() - Resume resync on all devices that may resync now |
| 1353 | * @mdev: DRBD device. |
| 1354 | * |
| 1355 | * Called from process context only (admin command and worker). |
| 1356 | */ |
| 1357 | static int _drbd_resume_next(struct drbd_conf *mdev) |
| 1358 | { |
| 1359 | struct drbd_conf *odev; |
| 1360 | int i, rv = 0; |
| 1361 | |
| 1362 | for (i = 0; i < minor_count; i++) { |
| 1363 | odev = minor_to_mdev(i); |
| 1364 | if (!odev) |
| 1365 | continue; |
| 1366 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
| 1367 | continue; |
| 1368 | if (odev->state.aftr_isp) { |
| 1369 | if (_drbd_may_sync_now(odev)) |
| 1370 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0), |
| 1371 | CS_HARD, NULL) |
| 1372 | != SS_NOTHING_TO_DO) ; |
| 1373 | } |
| 1374 | } |
| 1375 | return rv; |
| 1376 | } |
| 1377 | |
| 1378 | void resume_next_sg(struct drbd_conf *mdev) |
| 1379 | { |
| 1380 | write_lock_irq(&global_state_lock); |
| 1381 | _drbd_resume_next(mdev); |
| 1382 | write_unlock_irq(&global_state_lock); |
| 1383 | } |
| 1384 | |
| 1385 | void suspend_other_sg(struct drbd_conf *mdev) |
| 1386 | { |
| 1387 | write_lock_irq(&global_state_lock); |
| 1388 | _drbd_pause_after(mdev); |
| 1389 | write_unlock_irq(&global_state_lock); |
| 1390 | } |
| 1391 | |
| 1392 | static int sync_after_error(struct drbd_conf *mdev, int o_minor) |
| 1393 | { |
| 1394 | struct drbd_conf *odev; |
| 1395 | |
| 1396 | if (o_minor == -1) |
| 1397 | return NO_ERROR; |
| 1398 | if (o_minor < -1 || minor_to_mdev(o_minor) == NULL) |
| 1399 | return ERR_SYNC_AFTER; |
| 1400 | |
| 1401 | /* check for loops */ |
| 1402 | odev = minor_to_mdev(o_minor); |
| 1403 | while (1) { |
| 1404 | if (odev == mdev) |
| 1405 | return ERR_SYNC_AFTER_CYCLE; |
| 1406 | |
| 1407 | /* dependency chain ends here, no cycles. */ |
| 1408 | if (odev->sync_conf.after == -1) |
| 1409 | return NO_ERROR; |
| 1410 | |
| 1411 | /* follow the dependency chain */ |
| 1412 | odev = minor_to_mdev(odev->sync_conf.after); |
| 1413 | } |
| 1414 | } |
| 1415 | |
| 1416 | int drbd_alter_sa(struct drbd_conf *mdev, int na) |
| 1417 | { |
| 1418 | int changes; |
| 1419 | int retcode; |
| 1420 | |
| 1421 | write_lock_irq(&global_state_lock); |
| 1422 | retcode = sync_after_error(mdev, na); |
| 1423 | if (retcode == NO_ERROR) { |
| 1424 | mdev->sync_conf.after = na; |
| 1425 | do { |
| 1426 | changes = _drbd_pause_after(mdev); |
| 1427 | changes |= _drbd_resume_next(mdev); |
| 1428 | } while (changes); |
| 1429 | } |
| 1430 | write_unlock_irq(&global_state_lock); |
| 1431 | return retcode; |
| 1432 | } |
| 1433 | |
| 1434 | /** |
| 1435 | * drbd_start_resync() - Start the resync process |
| 1436 | * @mdev: DRBD device. |
| 1437 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET |
| 1438 | * |
| 1439 | * This function might bring you directly into one of the |
| 1440 | * C_PAUSED_SYNC_* states. |
| 1441 | */ |
| 1442 | void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side) |
| 1443 | { |
| 1444 | union drbd_state ns; |
| 1445 | int r; |
| 1446 | |
| 1447 | if (mdev->state.conn >= C_SYNC_SOURCE) { |
| 1448 | dev_err(DEV, "Resync already running!\n"); |
| 1449 | return; |
| 1450 | } |
| 1451 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1452 | /* In case a previous resync run was aborted by an IO error/detach on the peer. */ |
| 1453 | drbd_rs_cancel_all(mdev); |
| 1454 | |
| 1455 | if (side == C_SYNC_TARGET) { |
| 1456 | /* Since application IO was locked out during C_WF_BITMAP_T and |
| 1457 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET |
| 1458 | we check that we might make the data inconsistent. */ |
| 1459 | r = drbd_khelper(mdev, "before-resync-target"); |
| 1460 | r = (r >> 8) & 0xff; |
| 1461 | if (r > 0) { |
| 1462 | dev_info(DEV, "before-resync-target handler returned %d, " |
| 1463 | "dropping connection.\n", r); |
| 1464 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
| 1465 | return; |
| 1466 | } |
| 1467 | } |
| 1468 | |
| 1469 | drbd_state_lock(mdev); |
| 1470 | |
| 1471 | if (!get_ldev_if_state(mdev, D_NEGOTIATING)) { |
| 1472 | drbd_state_unlock(mdev); |
| 1473 | return; |
| 1474 | } |
| 1475 | |
| 1476 | if (side == C_SYNC_TARGET) { |
| 1477 | mdev->bm_resync_fo = 0; |
| 1478 | } else /* side == C_SYNC_SOURCE */ { |
| 1479 | u64 uuid; |
| 1480 | |
| 1481 | get_random_bytes(&uuid, sizeof(u64)); |
| 1482 | drbd_uuid_set(mdev, UI_BITMAP, uuid); |
| 1483 | drbd_send_sync_uuid(mdev, uuid); |
| 1484 | |
| 1485 | D_ASSERT(mdev->state.disk == D_UP_TO_DATE); |
| 1486 | } |
| 1487 | |
| 1488 | write_lock_irq(&global_state_lock); |
| 1489 | ns = mdev->state; |
| 1490 | |
| 1491 | ns.aftr_isp = !_drbd_may_sync_now(mdev); |
| 1492 | |
| 1493 | ns.conn = side; |
| 1494 | |
| 1495 | if (side == C_SYNC_TARGET) |
| 1496 | ns.disk = D_INCONSISTENT; |
| 1497 | else /* side == C_SYNC_SOURCE */ |
| 1498 | ns.pdsk = D_INCONSISTENT; |
| 1499 | |
| 1500 | r = __drbd_set_state(mdev, ns, CS_VERBOSE, NULL); |
| 1501 | ns = mdev->state; |
| 1502 | |
| 1503 | if (ns.conn < C_CONNECTED) |
| 1504 | r = SS_UNKNOWN_ERROR; |
| 1505 | |
| 1506 | if (r == SS_SUCCESS) { |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 1507 | unsigned long tw = drbd_bm_total_weight(mdev); |
| 1508 | unsigned long now = jiffies; |
| 1509 | int i; |
| 1510 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1511 | mdev->rs_failed = 0; |
| 1512 | mdev->rs_paused = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1513 | mdev->rs_same_csum = 0; |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 1514 | mdev->rs_last_events = 0; |
| 1515 | mdev->rs_last_sect_ev = 0; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 1516 | mdev->rs_total = tw; |
| 1517 | mdev->rs_start = now; |
| 1518 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
| 1519 | mdev->rs_mark_left[i] = tw; |
| 1520 | mdev->rs_mark_time[i] = now; |
| 1521 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1522 | _drbd_pause_after(mdev); |
| 1523 | } |
| 1524 | write_unlock_irq(&global_state_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1525 | put_ldev(mdev); |
| 1526 | |
| 1527 | if (r == SS_SUCCESS) { |
| 1528 | dev_info(DEV, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", |
| 1529 | drbd_conn_str(ns.conn), |
| 1530 | (unsigned long) mdev->rs_total << (BM_BLOCK_SHIFT-10), |
| 1531 | (unsigned long) mdev->rs_total); |
| 1532 | |
Lars Ellenberg | af85e8e | 2010-10-07 16:07:55 +0200 | [diff] [blame] | 1533 | if (mdev->agreed_pro_version < 95 && mdev->rs_total == 0) { |
| 1534 | /* This still has a race (about when exactly the peers |
| 1535 | * detect connection loss) that can lead to a full sync |
| 1536 | * on next handshake. In 8.3.9 we fixed this with explicit |
| 1537 | * resync-finished notifications, but the fix |
| 1538 | * introduces a protocol change. Sleeping for some |
| 1539 | * time longer than the ping interval + timeout on the |
| 1540 | * SyncSource, to give the SyncTarget the chance to |
| 1541 | * detect connection loss, then waiting for a ping |
| 1542 | * response (implicit in drbd_resync_finished) reduces |
| 1543 | * the race considerably, but does not solve it. */ |
| 1544 | if (side == C_SYNC_SOURCE) |
| 1545 | schedule_timeout_interruptible( |
| 1546 | mdev->net_conf->ping_int * HZ + |
| 1547 | mdev->net_conf->ping_timeo*HZ/9); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1548 | drbd_resync_finished(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1549 | } |
| 1550 | |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 1551 | atomic_set(&mdev->rs_sect_in, 0); |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 1552 | atomic_set(&mdev->rs_sect_ev, 0); |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 1553 | mdev->rs_in_flight = 0; |
| 1554 | mdev->rs_planed = 0; |
| 1555 | spin_lock(&mdev->peer_seq_lock); |
| 1556 | fifo_set(&mdev->rs_plan_s, 0); |
| 1557 | spin_unlock(&mdev->peer_seq_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1558 | /* ns.conn may already be != mdev->state.conn, |
| 1559 | * we may have been paused in between, or become paused until |
| 1560 | * the timer triggers. |
| 1561 | * No matter, that is handled in resync_timer_fn() */ |
| 1562 | if (ns.conn == C_SYNC_TARGET) |
| 1563 | mod_timer(&mdev->resync_timer, jiffies); |
| 1564 | |
| 1565 | drbd_md_sync(mdev); |
| 1566 | } |
Philipp Reisner | d0c3f60 | 2010-03-02 15:06:45 +0100 | [diff] [blame] | 1567 | drbd_state_unlock(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1568 | } |
| 1569 | |
| 1570 | int drbd_worker(struct drbd_thread *thi) |
| 1571 | { |
| 1572 | struct drbd_conf *mdev = thi->mdev; |
| 1573 | struct drbd_work *w = NULL; |
| 1574 | LIST_HEAD(work_list); |
| 1575 | int intr = 0, i; |
| 1576 | |
| 1577 | sprintf(current->comm, "drbd%d_worker", mdev_to_minor(mdev)); |
| 1578 | |
| 1579 | while (get_t_state(thi) == Running) { |
| 1580 | drbd_thread_current_set_cpu(mdev); |
| 1581 | |
| 1582 | if (down_trylock(&mdev->data.work.s)) { |
| 1583 | mutex_lock(&mdev->data.mutex); |
| 1584 | if (mdev->data.socket && !mdev->net_conf->no_cork) |
| 1585 | drbd_tcp_uncork(mdev->data.socket); |
| 1586 | mutex_unlock(&mdev->data.mutex); |
| 1587 | |
| 1588 | intr = down_interruptible(&mdev->data.work.s); |
| 1589 | |
| 1590 | mutex_lock(&mdev->data.mutex); |
| 1591 | if (mdev->data.socket && !mdev->net_conf->no_cork) |
| 1592 | drbd_tcp_cork(mdev->data.socket); |
| 1593 | mutex_unlock(&mdev->data.mutex); |
| 1594 | } |
| 1595 | |
| 1596 | if (intr) { |
| 1597 | D_ASSERT(intr == -EINTR); |
| 1598 | flush_signals(current); |
| 1599 | ERR_IF (get_t_state(thi) == Running) |
| 1600 | continue; |
| 1601 | break; |
| 1602 | } |
| 1603 | |
| 1604 | if (get_t_state(thi) != Running) |
| 1605 | break; |
| 1606 | /* With this break, we have done a down() but not consumed |
| 1607 | the entry from the list. The cleanup code takes care of |
| 1608 | this... */ |
| 1609 | |
| 1610 | w = NULL; |
| 1611 | spin_lock_irq(&mdev->data.work.q_lock); |
| 1612 | ERR_IF(list_empty(&mdev->data.work.q)) { |
| 1613 | /* something terribly wrong in our logic. |
| 1614 | * we were able to down() the semaphore, |
| 1615 | * but the list is empty... doh. |
| 1616 | * |
| 1617 | * what is the best thing to do now? |
| 1618 | * try again from scratch, restarting the receiver, |
| 1619 | * asender, whatnot? could break even more ugly, |
| 1620 | * e.g. when we are primary, but no good local data. |
| 1621 | * |
| 1622 | * I'll try to get away just starting over this loop. |
| 1623 | */ |
| 1624 | spin_unlock_irq(&mdev->data.work.q_lock); |
| 1625 | continue; |
| 1626 | } |
| 1627 | w = list_entry(mdev->data.work.q.next, struct drbd_work, list); |
| 1628 | list_del_init(&w->list); |
| 1629 | spin_unlock_irq(&mdev->data.work.q_lock); |
| 1630 | |
| 1631 | if (!w->cb(mdev, w, mdev->state.conn < C_CONNECTED)) { |
| 1632 | /* dev_warn(DEV, "worker: a callback failed! \n"); */ |
| 1633 | if (mdev->state.conn >= C_CONNECTED) |
| 1634 | drbd_force_state(mdev, |
| 1635 | NS(conn, C_NETWORK_FAILURE)); |
| 1636 | } |
| 1637 | } |
| 1638 | D_ASSERT(test_bit(DEVICE_DYING, &mdev->flags)); |
| 1639 | D_ASSERT(test_bit(CONFIG_PENDING, &mdev->flags)); |
| 1640 | |
| 1641 | spin_lock_irq(&mdev->data.work.q_lock); |
| 1642 | i = 0; |
| 1643 | while (!list_empty(&mdev->data.work.q)) { |
| 1644 | list_splice_init(&mdev->data.work.q, &work_list); |
| 1645 | spin_unlock_irq(&mdev->data.work.q_lock); |
| 1646 | |
| 1647 | while (!list_empty(&work_list)) { |
| 1648 | w = list_entry(work_list.next, struct drbd_work, list); |
| 1649 | list_del_init(&w->list); |
| 1650 | w->cb(mdev, w, 1); |
| 1651 | i++; /* dead debugging code */ |
| 1652 | } |
| 1653 | |
| 1654 | spin_lock_irq(&mdev->data.work.q_lock); |
| 1655 | } |
| 1656 | sema_init(&mdev->data.work.s, 0); |
| 1657 | /* DANGEROUS race: if someone did queue his work within the spinlock, |
| 1658 | * but up() ed outside the spinlock, we could get an up() on the |
| 1659 | * semaphore without corresponding list entry. |
| 1660 | * So don't do that. |
| 1661 | */ |
| 1662 | spin_unlock_irq(&mdev->data.work.q_lock); |
| 1663 | |
| 1664 | D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE); |
| 1665 | /* _drbd_set_state only uses stop_nowait. |
| 1666 | * wait here for the Exiting receiver. */ |
| 1667 | drbd_thread_stop(&mdev->receiver); |
| 1668 | drbd_mdev_cleanup(mdev); |
| 1669 | |
| 1670 | dev_info(DEV, "worker terminated\n"); |
| 1671 | |
| 1672 | clear_bit(DEVICE_DYING, &mdev->flags); |
| 1673 | clear_bit(CONFIG_PENDING, &mdev->flags); |
| 1674 | wake_up(&mdev->state_wait); |
| 1675 | |
| 1676 | return 0; |
| 1677 | } |