Commit | Line | Data |
---|---|---|
c6ae4c04 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
b411b363 PR |
2 | /* |
3 | drbd_worker.c | |
4 | ||
5 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
6 | ||
7 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
8 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
9 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
10 | ||
b411b363 | 11 | |
84b8c06b | 12 | */ |
b411b363 | 13 | |
b411b363 | 14 | #include <linux/module.h> |
b411b363 | 15 | #include <linux/drbd.h> |
174cd4b1 | 16 | #include <linux/sched/signal.h> |
b411b363 PR |
17 | #include <linux/wait.h> |
18 | #include <linux/mm.h> | |
19 | #include <linux/memcontrol.h> | |
20 | #include <linux/mm_inline.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/random.h> | |
b411b363 PR |
23 | #include <linux/string.h> |
24 | #include <linux/scatterlist.h> | |
c6a564ff | 25 | #include <linux/part_stat.h> |
b411b363 PR |
26 | |
27 | #include "drbd_int.h" | |
a3603a6e | 28 | #include "drbd_protocol.h" |
b411b363 | 29 | #include "drbd_req.h" |
b411b363 | 30 | |
d448a2e1 AG |
31 | static int make_ov_request(struct drbd_device *, int); |
32 | static int make_resync_request(struct drbd_device *, int); | |
b411b363 | 33 | |
c5a91619 | 34 | /* endio handlers: |
ed15b795 | 35 | * drbd_md_endio (defined here) |
fcefa62e AG |
36 | * drbd_request_endio (defined here) |
37 | * drbd_peer_request_endio (defined here) | |
ed15b795 | 38 | * drbd_bm_endio (defined in drbd_bitmap.c) |
c5a91619 | 39 | * |
b411b363 PR |
40 | * For all these callbacks, note the following: |
41 | * The callbacks will be called in irq context by the IDE drivers, | |
42 | * and in Softirqs/Tasklets/BH context by the SCSI drivers. | |
43 | * Try to get the locking right :) | |
44 | * | |
45 | */ | |
46 | ||
b411b363 PR |
47 | /* used for synchronous meta data and bitmap IO |
48 | * submitted by drbd_md_sync_page_io() | |
49 | */ | |
4246a0b6 | 50 | void drbd_md_endio(struct bio *bio) |
b411b363 | 51 | { |
b30ab791 | 52 | struct drbd_device *device; |
b411b363 | 53 | |
e37d2438 | 54 | device = bio->bi_private; |
4e4cbee9 | 55 | device->md_io.error = blk_status_to_errno(bio->bi_status); |
b411b363 | 56 | |
7c752ed3 LE |
57 | /* special case: drbd_md_read() during drbd_adm_attach() */ |
58 | if (device->ldev) | |
59 | put_ldev(device); | |
60 | bio_put(bio); | |
61 | ||
0cfac5dd PR |
62 | /* We grabbed an extra reference in _drbd_md_sync_page_io() to be able |
63 | * to timeout on the lower level device, and eventually detach from it. | |
64 | * If this io completion runs after that timeout expired, this | |
65 | * drbd_md_put_buffer() may allow us to finally try and re-attach. | |
66 | * During normal operation, this only puts that extra reference | |
67 | * down to 1 again. | |
68 | * Make sure we first drop the reference, and only then signal | |
69 | * completion, or we may (in drbd_al_read_log()) cycle so fast into the | |
70 | * next drbd_md_sync_page_io(), that we trigger the | |
b30ab791 | 71 | * ASSERT(atomic_read(&device->md_io_in_use) == 1) there. |
0cfac5dd | 72 | */ |
b30ab791 | 73 | drbd_md_put_buffer(device); |
e37d2438 | 74 | device->md_io.done = 1; |
b30ab791 | 75 | wake_up(&device->misc_wait); |
b411b363 PR |
76 | } |
77 | ||
78 | /* reads on behalf of the partner, | |
79 | * "submitted" by the receiver | |
80 | */ | |
a186e478 | 81 | static void drbd_endio_read_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
b411b363 PR |
82 | { |
83 | unsigned long flags = 0; | |
6780139c AG |
84 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
85 | struct drbd_device *device = peer_device->device; | |
b411b363 | 86 | |
0500813f | 87 | spin_lock_irqsave(&device->resource->req_lock, flags); |
b30ab791 | 88 | device->read_cnt += peer_req->i.size >> 9; |
a8cd15ba | 89 | list_del(&peer_req->w.list); |
b30ab791 AG |
90 | if (list_empty(&device->read_ee)) |
91 | wake_up(&device->ee_wait); | |
db830c46 | 92 | if (test_bit(__EE_WAS_ERROR, &peer_req->flags)) |
b30ab791 | 93 | __drbd_chk_io_error(device, DRBD_READ_ERROR); |
0500813f | 94 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
b411b363 | 95 | |
6780139c | 96 | drbd_queue_work(&peer_device->connection->sender_work, &peer_req->w); |
b30ab791 | 97 | put_ldev(device); |
b411b363 PR |
98 | } |
99 | ||
100 | /* writes on behalf of the partner, or resync writes, | |
45bb912b | 101 | * "submitted" by the receiver, final stage. */ |
a0fb3c47 | 102 | void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
b411b363 PR |
103 | { |
104 | unsigned long flags = 0; | |
6780139c AG |
105 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
106 | struct drbd_device *device = peer_device->device; | |
668700b4 | 107 | struct drbd_connection *connection = peer_device->connection; |
181286ad | 108 | struct drbd_interval i; |
b411b363 | 109 | int do_wake; |
579b57ed | 110 | u64 block_id; |
b411b363 | 111 | int do_al_complete_io; |
b411b363 | 112 | |
db830c46 | 113 | /* after we moved peer_req to done_ee, |
b411b363 PR |
114 | * we may no longer access it, |
115 | * it may be freed/reused already! | |
116 | * (as soon as we release the req_lock) */ | |
181286ad | 117 | i = peer_req->i; |
db830c46 AG |
118 | do_al_complete_io = peer_req->flags & EE_CALL_AL_COMPLETE_IO; |
119 | block_id = peer_req->block_id; | |
21ae5d7f | 120 | peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; |
b411b363 | 121 | |
e1fbc4ca LE |
122 | if (peer_req->flags & EE_WAS_ERROR) { |
123 | /* In protocol != C, we usually do not send write acks. | |
124 | * In case of a write error, send the neg ack anyways. */ | |
125 | if (!__test_and_set_bit(__EE_SEND_WRITE_ACK, &peer_req->flags)) | |
126 | inc_unacked(device); | |
127 | drbd_set_out_of_sync(device, peer_req->i.sector, peer_req->i.size); | |
128 | } | |
129 | ||
0500813f | 130 | spin_lock_irqsave(&device->resource->req_lock, flags); |
b30ab791 | 131 | device->writ_cnt += peer_req->i.size >> 9; |
a8cd15ba | 132 | list_move_tail(&peer_req->w.list, &device->done_ee); |
b411b363 | 133 | |
bb3bfe96 | 134 | /* |
5e472264 | 135 | * Do not remove from the write_requests tree here: we did not send the |
bb3bfe96 AG |
136 | * Ack yet and did not wake possibly waiting conflicting requests. |
137 | * Removed from the tree from "drbd_process_done_ee" within the | |
84b8c06b | 138 | * appropriate dw.cb (e_end_block/e_end_resync_block) or from |
bb3bfe96 AG |
139 | * _drbd_clear_done_ee. |
140 | */ | |
b411b363 | 141 | |
b30ab791 | 142 | do_wake = list_empty(block_id == ID_SYNCER ? &device->sync_ee : &device->active_ee); |
b411b363 | 143 | |
9305455a | 144 | /* FIXME do we want to detach for failed REQ_OP_DISCARD? |
f31e583a | 145 | * ((peer_req->flags & (EE_WAS_ERROR|EE_TRIM)) == EE_WAS_ERROR) */ |
a0fb3c47 | 146 | if (peer_req->flags & EE_WAS_ERROR) |
b30ab791 | 147 | __drbd_chk_io_error(device, DRBD_WRITE_ERROR); |
668700b4 PR |
148 | |
149 | if (connection->cstate >= C_WF_REPORT_PARAMS) { | |
150 | kref_get(&device->kref); /* put is in drbd_send_acks_wf() */ | |
151 | if (!queue_work(connection->ack_sender, &peer_device->send_acks_work)) | |
152 | kref_put(&device->kref, drbd_destroy_device); | |
153 | } | |
0500813f | 154 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
b411b363 | 155 | |
579b57ed | 156 | if (block_id == ID_SYNCER) |
b30ab791 | 157 | drbd_rs_complete_io(device, i.sector); |
b411b363 PR |
158 | |
159 | if (do_wake) | |
b30ab791 | 160 | wake_up(&device->ee_wait); |
b411b363 PR |
161 | |
162 | if (do_al_complete_io) | |
b30ab791 | 163 | drbd_al_complete_io(device, &i); |
b411b363 | 164 | |
b30ab791 | 165 | put_ldev(device); |
45bb912b | 166 | } |
b411b363 | 167 | |
45bb912b LE |
168 | /* writes on behalf of the partner, or resync writes, |
169 | * "submitted" by the receiver. | |
170 | */ | |
4246a0b6 | 171 | void drbd_peer_request_endio(struct bio *bio) |
45bb912b | 172 | { |
db830c46 | 173 | struct drbd_peer_request *peer_req = bio->bi_private; |
a8cd15ba | 174 | struct drbd_device *device = peer_req->peer_device->device; |
7e5fec31 | 175 | bool is_write = bio_data_dir(bio) == WRITE; |
45c21793 CH |
176 | bool is_discard = bio_op(bio) == REQ_OP_WRITE_ZEROES || |
177 | bio_op(bio) == REQ_OP_DISCARD; | |
45bb912b | 178 | |
4e4cbee9 | 179 | if (bio->bi_status && __ratelimit(&drbd_ratelimit_state)) |
d0180171 | 180 | drbd_warn(device, "%s: error=%d s=%llus\n", |
a0fb3c47 | 181 | is_write ? (is_discard ? "discard" : "write") |
4e4cbee9 | 182 | : "read", bio->bi_status, |
db830c46 | 183 | (unsigned long long)peer_req->i.sector); |
45bb912b | 184 | |
4e4cbee9 | 185 | if (bio->bi_status) |
db830c46 | 186 | set_bit(__EE_WAS_ERROR, &peer_req->flags); |
45bb912b LE |
187 | |
188 | bio_put(bio); /* no need for the bio anymore */ | |
db830c46 | 189 | if (atomic_dec_and_test(&peer_req->pending_bios)) { |
45bb912b | 190 | if (is_write) |
db830c46 | 191 | drbd_endio_write_sec_final(peer_req); |
45bb912b | 192 | else |
db830c46 | 193 | drbd_endio_read_sec_final(peer_req); |
45bb912b | 194 | } |
b411b363 PR |
195 | } |
196 | ||
1ffa7bfa BX |
197 | static void |
198 | drbd_panic_after_delayed_completion_of_aborted_request(struct drbd_device *device) | |
142207f7 LE |
199 | { |
200 | panic("drbd%u %s/%u potential random memory corruption caused by delayed completion of aborted local request\n", | |
201 | device->minor, device->resource->name, device->vnr); | |
202 | } | |
203 | ||
b411b363 PR |
204 | /* read, readA or write requests on R_PRIMARY coming from drbd_make_request |
205 | */ | |
4246a0b6 | 206 | void drbd_request_endio(struct bio *bio) |
b411b363 | 207 | { |
a115413d | 208 | unsigned long flags; |
b411b363 | 209 | struct drbd_request *req = bio->bi_private; |
84b8c06b | 210 | struct drbd_device *device = req->device; |
a115413d | 211 | struct bio_and_error m; |
b411b363 | 212 | enum drbd_req_event what; |
1b6dd252 PR |
213 | |
214 | /* If this request was aborted locally before, | |
215 | * but now was completed "successfully", | |
216 | * chances are that this caused arbitrary data corruption. | |
217 | * | |
218 | * "aborting" requests, or force-detaching the disk, is intended for | |
219 | * completely blocked/hung local backing devices which do no longer | |
220 | * complete requests at all, not even do error completions. In this | |
221 | * situation, usually a hard-reset and failover is the only way out. | |
222 | * | |
223 | * By "aborting", basically faking a local error-completion, | |
224 | * we allow for a more graceful swichover by cleanly migrating services. | |
225 | * Still the affected node has to be rebooted "soon". | |
226 | * | |
227 | * By completing these requests, we allow the upper layers to re-use | |
228 | * the associated data pages. | |
229 | * | |
230 | * If later the local backing device "recovers", and now DMAs some data | |
231 | * from disk into the original request pages, in the best case it will | |
232 | * just put random data into unused pages; but typically it will corrupt | |
233 | * meanwhile completely unrelated data, causing all sorts of damage. | |
234 | * | |
235 | * Which means delayed successful completion, | |
236 | * especially for READ requests, | |
237 | * is a reason to panic(). | |
238 | * | |
239 | * We assume that a delayed *error* completion is OK, | |
240 | * though we still will complain noisily about it. | |
241 | */ | |
242 | if (unlikely(req->rq_state & RQ_LOCAL_ABORTED)) { | |
243 | if (__ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 244 | drbd_emerg(device, "delayed completion of aborted local request; disk-timeout may be too aggressive\n"); |
1b6dd252 | 245 | |
4e4cbee9 | 246 | if (!bio->bi_status) |
142207f7 | 247 | drbd_panic_after_delayed_completion_of_aborted_request(device); |
1b6dd252 PR |
248 | } |
249 | ||
b411b363 | 250 | /* to avoid recursion in __req_mod */ |
4e4cbee9 | 251 | if (unlikely(bio->bi_status)) { |
70246286 | 252 | switch (bio_op(bio)) { |
45c21793 | 253 | case REQ_OP_WRITE_ZEROES: |
70246286 | 254 | case REQ_OP_DISCARD: |
4e4cbee9 | 255 | if (bio->bi_status == BLK_STS_NOTSUPP) |
70246286 CH |
256 | what = DISCARD_COMPLETED_NOTSUPP; |
257 | else | |
258 | what = DISCARD_COMPLETED_WITH_ERROR; | |
259 | break; | |
260 | case REQ_OP_READ: | |
1eff9d32 | 261 | if (bio->bi_opf & REQ_RAHEAD) |
70246286 CH |
262 | what = READ_AHEAD_COMPLETED_WITH_ERROR; |
263 | else | |
264 | what = READ_COMPLETED_WITH_ERROR; | |
265 | break; | |
266 | default: | |
267 | what = WRITE_COMPLETED_WITH_ERROR; | |
268 | break; | |
269 | } | |
270 | } else { | |
8554df1c | 271 | what = COMPLETED_OK; |
70246286 | 272 | } |
b411b363 | 273 | |
4e4cbee9 | 274 | req->private_bio = ERR_PTR(blk_status_to_errno(bio->bi_status)); |
64dafbc9 | 275 | bio_put(bio); |
b411b363 | 276 | |
a115413d | 277 | /* not req_mod(), we need irqsave here! */ |
0500813f | 278 | spin_lock_irqsave(&device->resource->req_lock, flags); |
a115413d | 279 | __req_mod(req, what, &m); |
0500813f | 280 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
b30ab791 | 281 | put_ldev(device); |
a115413d LE |
282 | |
283 | if (m.bio) | |
b30ab791 | 284 | complete_master_bio(device, &m); |
b411b363 PR |
285 | } |
286 | ||
3d0e6375 | 287 | void drbd_csum_ee(struct crypto_shash *tfm, struct drbd_peer_request *peer_req, void *digest) |
45bb912b | 288 | { |
3d0e6375 | 289 | SHASH_DESC_ON_STACK(desc, tfm); |
db830c46 | 290 | struct page *page = peer_req->pages; |
45bb912b LE |
291 | struct page *tmp; |
292 | unsigned len; | |
3d0e6375 | 293 | void *src; |
45bb912b | 294 | |
3d0e6375 | 295 | desc->tfm = tfm; |
45bb912b | 296 | |
3d0e6375 | 297 | crypto_shash_init(desc); |
45bb912b | 298 | |
3d0e6375 | 299 | src = kmap_atomic(page); |
45bb912b LE |
300 | while ((tmp = page_chain_next(page))) { |
301 | /* all but the last page will be fully used */ | |
3d0e6375 KC |
302 | crypto_shash_update(desc, src, PAGE_SIZE); |
303 | kunmap_atomic(src); | |
45bb912b | 304 | page = tmp; |
3d0e6375 | 305 | src = kmap_atomic(page); |
45bb912b LE |
306 | } |
307 | /* and now the last, possibly only partially used page */ | |
db830c46 | 308 | len = peer_req->i.size & (PAGE_SIZE - 1); |
3d0e6375 KC |
309 | crypto_shash_update(desc, src, len ?: PAGE_SIZE); |
310 | kunmap_atomic(src); | |
311 | ||
312 | crypto_shash_final(desc, digest); | |
313 | shash_desc_zero(desc); | |
45bb912b LE |
314 | } |
315 | ||
3d0e6375 | 316 | void drbd_csum_bio(struct crypto_shash *tfm, struct bio *bio, void *digest) |
b411b363 | 317 | { |
3d0e6375 | 318 | SHASH_DESC_ON_STACK(desc, tfm); |
7988613b KO |
319 | struct bio_vec bvec; |
320 | struct bvec_iter iter; | |
b411b363 | 321 | |
3d0e6375 | 322 | desc->tfm = tfm; |
b411b363 | 323 | |
3d0e6375 | 324 | crypto_shash_init(desc); |
b411b363 | 325 | |
7988613b | 326 | bio_for_each_segment(bvec, bio, iter) { |
3d0e6375 KC |
327 | u8 *src; |
328 | ||
47227850 CH |
329 | src = bvec_kmap_local(&bvec); |
330 | crypto_shash_update(desc, src, bvec.bv_len); | |
331 | kunmap_local(src); | |
b411b363 | 332 | } |
3d0e6375 KC |
333 | crypto_shash_final(desc, digest); |
334 | shash_desc_zero(desc); | |
b411b363 PR |
335 | } |
336 | ||
9676c760 | 337 | /* MAYBE merge common code with w_e_end_ov_req */ |
99920dc5 | 338 | static int w_e_send_csum(struct drbd_work *w, int cancel) |
b411b363 | 339 | { |
a8cd15ba | 340 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
341 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
342 | struct drbd_device *device = peer_device->device; | |
b411b363 PR |
343 | int digest_size; |
344 | void *digest; | |
99920dc5 | 345 | int err = 0; |
b411b363 | 346 | |
53ea4331 LE |
347 | if (unlikely(cancel)) |
348 | goto out; | |
b411b363 | 349 | |
9676c760 | 350 | if (unlikely((peer_req->flags & EE_WAS_ERROR) != 0)) |
53ea4331 | 351 | goto out; |
b411b363 | 352 | |
3d0e6375 | 353 | digest_size = crypto_shash_digestsize(peer_device->connection->csums_tfm); |
53ea4331 LE |
354 | digest = kmalloc(digest_size, GFP_NOIO); |
355 | if (digest) { | |
db830c46 AG |
356 | sector_t sector = peer_req->i.sector; |
357 | unsigned int size = peer_req->i.size; | |
6780139c | 358 | drbd_csum_ee(peer_device->connection->csums_tfm, peer_req, digest); |
9676c760 | 359 | /* Free peer_req and pages before send. |
53ea4331 LE |
360 | * In case we block on congestion, we could otherwise run into |
361 | * some distributed deadlock, if the other side blocks on | |
362 | * congestion as well, because our receiver blocks in | |
c37c8ecf | 363 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
b30ab791 | 364 | drbd_free_peer_req(device, peer_req); |
db830c46 | 365 | peer_req = NULL; |
b30ab791 | 366 | inc_rs_pending(device); |
6780139c | 367 | err = drbd_send_drequest_csum(peer_device, sector, size, |
db1b0b72 AG |
368 | digest, digest_size, |
369 | P_CSUM_RS_REQUEST); | |
53ea4331 LE |
370 | kfree(digest); |
371 | } else { | |
d0180171 | 372 | drbd_err(device, "kmalloc() of digest failed.\n"); |
99920dc5 | 373 | err = -ENOMEM; |
53ea4331 | 374 | } |
b411b363 | 375 | |
53ea4331 | 376 | out: |
db830c46 | 377 | if (peer_req) |
b30ab791 | 378 | drbd_free_peer_req(device, peer_req); |
b411b363 | 379 | |
99920dc5 | 380 | if (unlikely(err)) |
d0180171 | 381 | drbd_err(device, "drbd_send_drequest(..., csum) failed\n"); |
99920dc5 | 382 | return err; |
b411b363 PR |
383 | } |
384 | ||
385 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
386 | ||
69a22773 | 387 | static int read_for_csum(struct drbd_peer_device *peer_device, sector_t sector, int size) |
b411b363 | 388 | { |
69a22773 | 389 | struct drbd_device *device = peer_device->device; |
db830c46 | 390 | struct drbd_peer_request *peer_req; |
b411b363 | 391 | |
b30ab791 | 392 | if (!get_ldev(device)) |
80a40e43 | 393 | return -EIO; |
b411b363 PR |
394 | |
395 | /* GFP_TRY, because if there is no memory available right now, this may | |
396 | * be rescheduled for later. It is "only" background resync, after all. */ | |
69a22773 | 397 | peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER /* unused */, sector, |
9104d31a | 398 | size, size, GFP_TRY); |
db830c46 | 399 | if (!peer_req) |
80a40e43 | 400 | goto defer; |
b411b363 | 401 | |
a8cd15ba | 402 | peer_req->w.cb = w_e_send_csum; |
0500813f | 403 | spin_lock_irq(&device->resource->req_lock); |
b9ed7080 | 404 | list_add_tail(&peer_req->w.list, &device->read_ee); |
0500813f | 405 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 406 | |
b30ab791 | 407 | atomic_add(size >> 9, &device->rs_sect_ev); |
bb3cc85e MC |
408 | if (drbd_submit_peer_request(device, peer_req, REQ_OP_READ, 0, |
409 | DRBD_FAULT_RS_RD) == 0) | |
80a40e43 | 410 | return 0; |
b411b363 | 411 | |
10f6d992 LE |
412 | /* If it failed because of ENOMEM, retry should help. If it failed |
413 | * because bio_add_page failed (probably broken lower level driver), | |
414 | * retry may or may not help. | |
415 | * If it does not, you may need to force disconnect. */ | |
0500813f | 416 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 417 | list_del(&peer_req->w.list); |
0500813f | 418 | spin_unlock_irq(&device->resource->req_lock); |
22cc37a9 | 419 | |
b30ab791 | 420 | drbd_free_peer_req(device, peer_req); |
80a40e43 | 421 | defer: |
b30ab791 | 422 | put_ldev(device); |
80a40e43 | 423 | return -EAGAIN; |
b411b363 PR |
424 | } |
425 | ||
99920dc5 | 426 | int w_resync_timer(struct drbd_work *w, int cancel) |
b411b363 | 427 | { |
84b8c06b AG |
428 | struct drbd_device *device = |
429 | container_of(w, struct drbd_device, resync_work); | |
430 | ||
b30ab791 | 431 | switch (device->state.conn) { |
63106d3c | 432 | case C_VERIFY_S: |
d448a2e1 | 433 | make_ov_request(device, cancel); |
63106d3c PR |
434 | break; |
435 | case C_SYNC_TARGET: | |
d448a2e1 | 436 | make_resync_request(device, cancel); |
63106d3c | 437 | break; |
b411b363 PR |
438 | } |
439 | ||
99920dc5 | 440 | return 0; |
794abb75 PR |
441 | } |
442 | ||
2bccef39 | 443 | void resync_timer_fn(struct timer_list *t) |
794abb75 | 444 | { |
2bccef39 | 445 | struct drbd_device *device = from_timer(device, t, resync_timer); |
794abb75 | 446 | |
15e26f6a LE |
447 | drbd_queue_work_if_unqueued( |
448 | &first_peer_device(device)->connection->sender_work, | |
449 | &device->resync_work); | |
b411b363 PR |
450 | } |
451 | ||
778f271d PR |
452 | static void fifo_set(struct fifo_buffer *fb, int value) |
453 | { | |
454 | int i; | |
455 | ||
456 | for (i = 0; i < fb->size; i++) | |
f10f2623 | 457 | fb->values[i] = value; |
778f271d PR |
458 | } |
459 | ||
460 | static int fifo_push(struct fifo_buffer *fb, int value) | |
461 | { | |
462 | int ov; | |
463 | ||
464 | ov = fb->values[fb->head_index]; | |
465 | fb->values[fb->head_index++] = value; | |
466 | ||
467 | if (fb->head_index >= fb->size) | |
468 | fb->head_index = 0; | |
469 | ||
470 | return ov; | |
471 | } | |
472 | ||
473 | static void fifo_add_val(struct fifo_buffer *fb, int value) | |
474 | { | |
475 | int i; | |
476 | ||
477 | for (i = 0; i < fb->size; i++) | |
478 | fb->values[i] += value; | |
479 | } | |
480 | ||
6a365874 | 481 | struct fifo_buffer *fifo_alloc(unsigned int fifo_size) |
9958c857 PR |
482 | { |
483 | struct fifo_buffer *fb; | |
484 | ||
6a365874 | 485 | fb = kzalloc(struct_size(fb, values, fifo_size), GFP_NOIO); |
9958c857 PR |
486 | if (!fb) |
487 | return NULL; | |
488 | ||
489 | fb->head_index = 0; | |
490 | fb->size = fifo_size; | |
491 | fb->total = 0; | |
492 | ||
493 | return fb; | |
494 | } | |
495 | ||
0e49d7b0 | 496 | static int drbd_rs_controller(struct drbd_device *device, unsigned int sect_in) |
778f271d | 497 | { |
daeda1cc | 498 | struct disk_conf *dc; |
7f34f614 | 499 | unsigned int want; /* The number of sectors we want in-flight */ |
778f271d | 500 | int req_sect; /* Number of sectors to request in this turn */ |
7f34f614 | 501 | int correction; /* Number of sectors more we need in-flight */ |
778f271d PR |
502 | int cps; /* correction per invocation of drbd_rs_controller() */ |
503 | int steps; /* Number of time steps to plan ahead */ | |
504 | int curr_corr; | |
505 | int max_sect; | |
813472ce | 506 | struct fifo_buffer *plan; |
778f271d | 507 | |
b30ab791 AG |
508 | dc = rcu_dereference(device->ldev->disk_conf); |
509 | plan = rcu_dereference(device->rs_plan_s); | |
778f271d | 510 | |
813472ce | 511 | steps = plan->size; /* (dc->c_plan_ahead * 10 * SLEEP_TIME) / HZ; */ |
778f271d | 512 | |
b30ab791 | 513 | if (device->rs_in_flight + sect_in == 0) { /* At start of resync */ |
daeda1cc | 514 | want = ((dc->resync_rate * 2 * SLEEP_TIME) / HZ) * steps; |
778f271d | 515 | } else { /* normal path */ |
daeda1cc PR |
516 | want = dc->c_fill_target ? dc->c_fill_target : |
517 | sect_in * dc->c_delay_target * HZ / (SLEEP_TIME * 10); | |
778f271d PR |
518 | } |
519 | ||
b30ab791 | 520 | correction = want - device->rs_in_flight - plan->total; |
778f271d PR |
521 | |
522 | /* Plan ahead */ | |
523 | cps = correction / steps; | |
813472ce PR |
524 | fifo_add_val(plan, cps); |
525 | plan->total += cps * steps; | |
778f271d PR |
526 | |
527 | /* What we do in this step */ | |
813472ce PR |
528 | curr_corr = fifo_push(plan, 0); |
529 | plan->total -= curr_corr; | |
778f271d PR |
530 | |
531 | req_sect = sect_in + curr_corr; | |
532 | if (req_sect < 0) | |
533 | req_sect = 0; | |
534 | ||
daeda1cc | 535 | max_sect = (dc->c_max_rate * 2 * SLEEP_TIME) / HZ; |
778f271d PR |
536 | if (req_sect > max_sect) |
537 | req_sect = max_sect; | |
538 | ||
539 | /* | |
d0180171 | 540 | drbd_warn(device, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n", |
b30ab791 AG |
541 | sect_in, device->rs_in_flight, want, correction, |
542 | steps, cps, device->rs_planed, curr_corr, req_sect); | |
778f271d PR |
543 | */ |
544 | ||
545 | return req_sect; | |
546 | } | |
547 | ||
b30ab791 | 548 | static int drbd_rs_number_requests(struct drbd_device *device) |
e65f440d | 549 | { |
0e49d7b0 LE |
550 | unsigned int sect_in; /* Number of sectors that came in since the last turn */ |
551 | int number, mxb; | |
552 | ||
553 | sect_in = atomic_xchg(&device->rs_sect_in, 0); | |
554 | device->rs_in_flight -= sect_in; | |
813472ce PR |
555 | |
556 | rcu_read_lock(); | |
0e49d7b0 | 557 | mxb = drbd_get_max_buffers(device) / 2; |
b30ab791 | 558 | if (rcu_dereference(device->rs_plan_s)->size) { |
0e49d7b0 | 559 | number = drbd_rs_controller(device, sect_in) >> (BM_BLOCK_SHIFT - 9); |
b30ab791 | 560 | device->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME; |
e65f440d | 561 | } else { |
b30ab791 AG |
562 | device->c_sync_rate = rcu_dereference(device->ldev->disk_conf)->resync_rate; |
563 | number = SLEEP_TIME * device->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ); | |
e65f440d | 564 | } |
813472ce | 565 | rcu_read_unlock(); |
e65f440d | 566 | |
0e49d7b0 LE |
567 | /* Don't have more than "max-buffers"/2 in-flight. |
568 | * Otherwise we may cause the remote site to stall on drbd_alloc_pages(), | |
569 | * potentially causing a distributed deadlock on congestion during | |
570 | * online-verify or (checksum-based) resync, if max-buffers, | |
571 | * socket buffer sizes and resync rate settings are mis-configured. */ | |
7f34f614 LE |
572 | |
573 | /* note that "number" is in units of "BM_BLOCK_SIZE" (which is 4k), | |
574 | * mxb (as used here, and in drbd_alloc_pages on the peer) is | |
575 | * "number of pages" (typically also 4k), | |
576 | * but "rs_in_flight" is in "sectors" (512 Byte). */ | |
577 | if (mxb - device->rs_in_flight/8 < number) | |
578 | number = mxb - device->rs_in_flight/8; | |
0e49d7b0 | 579 | |
e65f440d LE |
580 | return number; |
581 | } | |
582 | ||
44a4d551 | 583 | static int make_resync_request(struct drbd_device *const device, int cancel) |
b411b363 | 584 | { |
44a4d551 LE |
585 | struct drbd_peer_device *const peer_device = first_peer_device(device); |
586 | struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL; | |
b411b363 PR |
587 | unsigned long bit; |
588 | sector_t sector; | |
155bd9d1 | 589 | const sector_t capacity = get_capacity(device->vdisk); |
1816a2b4 | 590 | int max_bio_size; |
e65f440d | 591 | int number, rollback_i, size; |
506afb62 | 592 | int align, requeue = 0; |
0f0601f4 | 593 | int i = 0; |
92d94ae6 | 594 | int discard_granularity = 0; |
b411b363 PR |
595 | |
596 | if (unlikely(cancel)) | |
99920dc5 | 597 | return 0; |
b411b363 | 598 | |
b30ab791 | 599 | if (device->rs_total == 0) { |
af85e8e8 | 600 | /* empty resync? */ |
b30ab791 | 601 | drbd_resync_finished(device); |
99920dc5 | 602 | return 0; |
af85e8e8 LE |
603 | } |
604 | ||
b30ab791 AG |
605 | if (!get_ldev(device)) { |
606 | /* Since we only need to access device->rsync a | |
607 | get_ldev_if_state(device,D_FAILED) would be sufficient, but | |
b411b363 PR |
608 | to continue resync with a broken disk makes no sense at |
609 | all */ | |
d0180171 | 610 | drbd_err(device, "Disk broke down during resync!\n"); |
99920dc5 | 611 | return 0; |
b411b363 PR |
612 | } |
613 | ||
9104d31a | 614 | if (connection->agreed_features & DRBD_FF_THIN_RESYNC) { |
92d94ae6 PR |
615 | rcu_read_lock(); |
616 | discard_granularity = rcu_dereference(device->ldev->disk_conf)->rs_discard_granularity; | |
617 | rcu_read_unlock(); | |
618 | } | |
619 | ||
b30ab791 AG |
620 | max_bio_size = queue_max_hw_sectors(device->rq_queue) << 9; |
621 | number = drbd_rs_number_requests(device); | |
0e49d7b0 | 622 | if (number <= 0) |
0f0601f4 | 623 | goto requeue; |
b411b363 | 624 | |
b411b363 | 625 | for (i = 0; i < number; i++) { |
506afb62 LE |
626 | /* Stop generating RS requests when half of the send buffer is filled, |
627 | * but notify TCP that we'd like to have more space. */ | |
44a4d551 LE |
628 | mutex_lock(&connection->data.mutex); |
629 | if (connection->data.socket) { | |
506afb62 LE |
630 | struct sock *sk = connection->data.socket->sk; |
631 | int queued = sk->sk_wmem_queued; | |
632 | int sndbuf = sk->sk_sndbuf; | |
633 | if (queued > sndbuf / 2) { | |
634 | requeue = 1; | |
635 | if (sk->sk_socket) | |
636 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
637 | } | |
638 | } else | |
639 | requeue = 1; | |
44a4d551 | 640 | mutex_unlock(&connection->data.mutex); |
506afb62 | 641 | if (requeue) |
b411b363 PR |
642 | goto requeue; |
643 | ||
644 | next_sector: | |
645 | size = BM_BLOCK_SIZE; | |
b30ab791 | 646 | bit = drbd_bm_find_next(device, device->bm_resync_fo); |
b411b363 | 647 | |
4b0715f0 | 648 | if (bit == DRBD_END_OF_BITMAP) { |
b30ab791 AG |
649 | device->bm_resync_fo = drbd_bm_bits(device); |
650 | put_ldev(device); | |
99920dc5 | 651 | return 0; |
b411b363 PR |
652 | } |
653 | ||
654 | sector = BM_BIT_TO_SECT(bit); | |
655 | ||
ad3fee79 | 656 | if (drbd_try_rs_begin_io(device, sector)) { |
b30ab791 | 657 | device->bm_resync_fo = bit; |
b411b363 PR |
658 | goto requeue; |
659 | } | |
b30ab791 | 660 | device->bm_resync_fo = bit + 1; |
b411b363 | 661 | |
b30ab791 AG |
662 | if (unlikely(drbd_bm_test_bit(device, bit) == 0)) { |
663 | drbd_rs_complete_io(device, sector); | |
b411b363 PR |
664 | goto next_sector; |
665 | } | |
666 | ||
1816a2b4 | 667 | #if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE |
b411b363 PR |
668 | /* try to find some adjacent bits. |
669 | * we stop if we have already the maximum req size. | |
670 | * | |
671 | * Additionally always align bigger requests, in order to | |
672 | * be prepared for all stripe sizes of software RAIDs. | |
b411b363 PR |
673 | */ |
674 | align = 1; | |
d207450c | 675 | rollback_i = i; |
6377b923 | 676 | while (i < number) { |
1816a2b4 | 677 | if (size + BM_BLOCK_SIZE > max_bio_size) |
b411b363 PR |
678 | break; |
679 | ||
680 | /* Be always aligned */ | |
681 | if (sector & ((1<<(align+3))-1)) | |
682 | break; | |
683 | ||
92d94ae6 PR |
684 | if (discard_granularity && size == discard_granularity) |
685 | break; | |
686 | ||
b411b363 PR |
687 | /* do not cross extent boundaries */ |
688 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) | |
689 | break; | |
690 | /* now, is it actually dirty, after all? | |
691 | * caution, drbd_bm_test_bit is tri-state for some | |
692 | * obscure reason; ( b == 0 ) would get the out-of-band | |
693 | * only accidentally right because of the "oddly sized" | |
694 | * adjustment below */ | |
b30ab791 | 695 | if (drbd_bm_test_bit(device, bit+1) != 1) |
b411b363 PR |
696 | break; |
697 | bit++; | |
698 | size += BM_BLOCK_SIZE; | |
699 | if ((BM_BLOCK_SIZE << align) <= size) | |
700 | align++; | |
701 | i++; | |
702 | } | |
703 | /* if we merged some, | |
704 | * reset the offset to start the next drbd_bm_find_next from */ | |
705 | if (size > BM_BLOCK_SIZE) | |
b30ab791 | 706 | device->bm_resync_fo = bit + 1; |
b411b363 PR |
707 | #endif |
708 | ||
709 | /* adjust very last sectors, in case we are oddly sized */ | |
710 | if (sector + (size>>9) > capacity) | |
711 | size = (capacity-sector)<<9; | |
aaaba345 LE |
712 | |
713 | if (device->use_csums) { | |
44a4d551 | 714 | switch (read_for_csum(peer_device, sector, size)) { |
80a40e43 | 715 | case -EIO: /* Disk failure */ |
b30ab791 | 716 | put_ldev(device); |
99920dc5 | 717 | return -EIO; |
80a40e43 | 718 | case -EAGAIN: /* allocation failed, or ldev busy */ |
b30ab791 AG |
719 | drbd_rs_complete_io(device, sector); |
720 | device->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
d207450c | 721 | i = rollback_i; |
b411b363 | 722 | goto requeue; |
80a40e43 LE |
723 | case 0: |
724 | /* everything ok */ | |
725 | break; | |
726 | default: | |
727 | BUG(); | |
b411b363 PR |
728 | } |
729 | } else { | |
99920dc5 AG |
730 | int err; |
731 | ||
b30ab791 | 732 | inc_rs_pending(device); |
92d94ae6 PR |
733 | err = drbd_send_drequest(peer_device, |
734 | size == discard_granularity ? P_RS_THIN_REQ : P_RS_DATA_REQUEST, | |
99920dc5 AG |
735 | sector, size, ID_SYNCER); |
736 | if (err) { | |
d0180171 | 737 | drbd_err(device, "drbd_send_drequest() failed, aborting...\n"); |
b30ab791 AG |
738 | dec_rs_pending(device); |
739 | put_ldev(device); | |
99920dc5 | 740 | return err; |
b411b363 PR |
741 | } |
742 | } | |
743 | } | |
744 | ||
b30ab791 | 745 | if (device->bm_resync_fo >= drbd_bm_bits(device)) { |
b411b363 PR |
746 | /* last syncer _request_ was sent, |
747 | * but the P_RS_DATA_REPLY not yet received. sync will end (and | |
748 | * next sync group will resume), as soon as we receive the last | |
749 | * resync data block, and the last bit is cleared. | |
750 | * until then resync "work" is "inactive" ... | |
751 | */ | |
b30ab791 | 752 | put_ldev(device); |
99920dc5 | 753 | return 0; |
b411b363 PR |
754 | } |
755 | ||
756 | requeue: | |
b30ab791 AG |
757 | device->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
758 | mod_timer(&device->resync_timer, jiffies + SLEEP_TIME); | |
759 | put_ldev(device); | |
99920dc5 | 760 | return 0; |
b411b363 PR |
761 | } |
762 | ||
d448a2e1 | 763 | static int make_ov_request(struct drbd_device *device, int cancel) |
b411b363 PR |
764 | { |
765 | int number, i, size; | |
766 | sector_t sector; | |
155bd9d1 | 767 | const sector_t capacity = get_capacity(device->vdisk); |
58ffa580 | 768 | bool stop_sector_reached = false; |
b411b363 PR |
769 | |
770 | if (unlikely(cancel)) | |
771 | return 1; | |
772 | ||
b30ab791 | 773 | number = drbd_rs_number_requests(device); |
b411b363 | 774 | |
b30ab791 | 775 | sector = device->ov_position; |
b411b363 | 776 | for (i = 0; i < number; i++) { |
58ffa580 | 777 | if (sector >= capacity) |
b411b363 | 778 | return 1; |
58ffa580 LE |
779 | |
780 | /* We check for "finished" only in the reply path: | |
781 | * w_e_end_ov_reply(). | |
782 | * We need to send at least one request out. */ | |
783 | stop_sector_reached = i > 0 | |
b30ab791 AG |
784 | && verify_can_do_stop_sector(device) |
785 | && sector >= device->ov_stop_sector; | |
58ffa580 LE |
786 | if (stop_sector_reached) |
787 | break; | |
b411b363 PR |
788 | |
789 | size = BM_BLOCK_SIZE; | |
790 | ||
ad3fee79 | 791 | if (drbd_try_rs_begin_io(device, sector)) { |
b30ab791 | 792 | device->ov_position = sector; |
b411b363 PR |
793 | goto requeue; |
794 | } | |
795 | ||
796 | if (sector + (size>>9) > capacity) | |
797 | size = (capacity-sector)<<9; | |
798 | ||
b30ab791 | 799 | inc_rs_pending(device); |
69a22773 | 800 | if (drbd_send_ov_request(first_peer_device(device), sector, size)) { |
b30ab791 | 801 | dec_rs_pending(device); |
b411b363 PR |
802 | return 0; |
803 | } | |
804 | sector += BM_SECT_PER_BIT; | |
805 | } | |
b30ab791 | 806 | device->ov_position = sector; |
b411b363 PR |
807 | |
808 | requeue: | |
b30ab791 | 809 | device->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
58ffa580 | 810 | if (i == 0 || !stop_sector_reached) |
b30ab791 | 811 | mod_timer(&device->resync_timer, jiffies + SLEEP_TIME); |
b411b363 PR |
812 | return 1; |
813 | } | |
814 | ||
99920dc5 | 815 | int w_ov_finished(struct drbd_work *w, int cancel) |
b411b363 | 816 | { |
84b8c06b AG |
817 | struct drbd_device_work *dw = |
818 | container_of(w, struct drbd_device_work, w); | |
819 | struct drbd_device *device = dw->device; | |
820 | kfree(dw); | |
b30ab791 AG |
821 | ov_out_of_sync_print(device); |
822 | drbd_resync_finished(device); | |
b411b363 | 823 | |
99920dc5 | 824 | return 0; |
b411b363 PR |
825 | } |
826 | ||
99920dc5 | 827 | static int w_resync_finished(struct drbd_work *w, int cancel) |
b411b363 | 828 | { |
84b8c06b AG |
829 | struct drbd_device_work *dw = |
830 | container_of(w, struct drbd_device_work, w); | |
831 | struct drbd_device *device = dw->device; | |
832 | kfree(dw); | |
b411b363 | 833 | |
b30ab791 | 834 | drbd_resync_finished(device); |
b411b363 | 835 | |
99920dc5 | 836 | return 0; |
b411b363 PR |
837 | } |
838 | ||
b30ab791 | 839 | static void ping_peer(struct drbd_device *device) |
af85e8e8 | 840 | { |
a6b32bc3 | 841 | struct drbd_connection *connection = first_peer_device(device)->connection; |
2a67d8b9 | 842 | |
bde89a9e AG |
843 | clear_bit(GOT_PING_ACK, &connection->flags); |
844 | request_ping(connection); | |
845 | wait_event(connection->ping_wait, | |
846 | test_bit(GOT_PING_ACK, &connection->flags) || device->state.conn < C_CONNECTED); | |
af85e8e8 LE |
847 | } |
848 | ||
b30ab791 | 849 | int drbd_resync_finished(struct drbd_device *device) |
b411b363 | 850 | { |
26a96110 | 851 | struct drbd_connection *connection = first_peer_device(device)->connection; |
b411b363 PR |
852 | unsigned long db, dt, dbdt; |
853 | unsigned long n_oos; | |
854 | union drbd_state os, ns; | |
84b8c06b | 855 | struct drbd_device_work *dw; |
b411b363 | 856 | char *khelper_cmd = NULL; |
26525618 | 857 | int verify_done = 0; |
b411b363 PR |
858 | |
859 | /* Remove all elements from the resync LRU. Since future actions | |
860 | * might set bits in the (main) bitmap, then the entries in the | |
861 | * resync LRU would be wrong. */ | |
b30ab791 | 862 | if (drbd_rs_del_all(device)) { |
b411b363 PR |
863 | /* In case this is not possible now, most probably because |
864 | * there are P_RS_DATA_REPLY Packets lingering on the worker's | |
865 | * queue (or even the read operations for those packets | |
866 | * is not finished by now). Retry in 100ms. */ | |
867 | ||
20ee6390 | 868 | schedule_timeout_interruptible(HZ / 10); |
84b8c06b AG |
869 | dw = kmalloc(sizeof(struct drbd_device_work), GFP_ATOMIC); |
870 | if (dw) { | |
871 | dw->w.cb = w_resync_finished; | |
872 | dw->device = device; | |
26a96110 | 873 | drbd_queue_work(&connection->sender_work, &dw->w); |
b411b363 PR |
874 | return 1; |
875 | } | |
84b8c06b | 876 | drbd_err(device, "Warn failed to drbd_rs_del_all() and to kmalloc(dw).\n"); |
b411b363 PR |
877 | } |
878 | ||
b30ab791 | 879 | dt = (jiffies - device->rs_start - device->rs_paused) / HZ; |
b411b363 PR |
880 | if (dt <= 0) |
881 | dt = 1; | |
84b8c06b | 882 | |
b30ab791 | 883 | db = device->rs_total; |
58ffa580 | 884 | /* adjust for verify start and stop sectors, respective reached position */ |
b30ab791 AG |
885 | if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) |
886 | db -= device->ov_left; | |
58ffa580 | 887 | |
b411b363 | 888 | dbdt = Bit2KB(db/dt); |
b30ab791 | 889 | device->rs_paused /= HZ; |
b411b363 | 890 | |
b30ab791 | 891 | if (!get_ldev(device)) |
b411b363 PR |
892 | goto out; |
893 | ||
b30ab791 | 894 | ping_peer(device); |
af85e8e8 | 895 | |
0500813f | 896 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 897 | os = drbd_read_state(device); |
b411b363 | 898 | |
26525618 LE |
899 | verify_done = (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T); |
900 | ||
b411b363 PR |
901 | /* This protects us against multiple calls (that can happen in the presence |
902 | of application IO), and against connectivity loss just before we arrive here. */ | |
903 | if (os.conn <= C_CONNECTED) | |
904 | goto out_unlock; | |
905 | ||
906 | ns = os; | |
907 | ns.conn = C_CONNECTED; | |
908 | ||
d0180171 | 909 | drbd_info(device, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", |
58ffa580 | 910 | verify_done ? "Online verify" : "Resync", |
b30ab791 | 911 | dt + device->rs_paused, device->rs_paused, dbdt); |
b411b363 | 912 | |
b30ab791 | 913 | n_oos = drbd_bm_total_weight(device); |
b411b363 PR |
914 | |
915 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { | |
916 | if (n_oos) { | |
d0180171 | 917 | drbd_alert(device, "Online verify found %lu %dk block out of sync!\n", |
b411b363 PR |
918 | n_oos, Bit2KB(1)); |
919 | khelper_cmd = "out-of-sync"; | |
920 | } | |
921 | } else { | |
0b0ba1ef | 922 | D_ASSERT(device, (n_oos - device->rs_failed) == 0); |
b411b363 PR |
923 | |
924 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) | |
925 | khelper_cmd = "after-resync-target"; | |
926 | ||
aaaba345 | 927 | if (device->use_csums && device->rs_total) { |
b30ab791 AG |
928 | const unsigned long s = device->rs_same_csum; |
929 | const unsigned long t = device->rs_total; | |
b411b363 PR |
930 | const int ratio = |
931 | (t == 0) ? 0 : | |
932 | (t < 100000) ? ((s*100)/t) : (s/(t/100)); | |
d0180171 | 933 | drbd_info(device, "%u %% had equal checksums, eliminated: %luK; " |
b411b363 PR |
934 | "transferred %luK total %luK\n", |
935 | ratio, | |
b30ab791 AG |
936 | Bit2KB(device->rs_same_csum), |
937 | Bit2KB(device->rs_total - device->rs_same_csum), | |
938 | Bit2KB(device->rs_total)); | |
b411b363 PR |
939 | } |
940 | } | |
941 | ||
b30ab791 | 942 | if (device->rs_failed) { |
d0180171 | 943 | drbd_info(device, " %lu failed blocks\n", device->rs_failed); |
b411b363 PR |
944 | |
945 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
946 | ns.disk = D_INCONSISTENT; | |
947 | ns.pdsk = D_UP_TO_DATE; | |
948 | } else { | |
949 | ns.disk = D_UP_TO_DATE; | |
950 | ns.pdsk = D_INCONSISTENT; | |
951 | } | |
952 | } else { | |
953 | ns.disk = D_UP_TO_DATE; | |
954 | ns.pdsk = D_UP_TO_DATE; | |
955 | ||
956 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
b30ab791 | 957 | if (device->p_uuid) { |
b411b363 PR |
958 | int i; |
959 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) | |
b30ab791 AG |
960 | _drbd_uuid_set(device, i, device->p_uuid[i]); |
961 | drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_CURRENT]); | |
962 | _drbd_uuid_set(device, UI_CURRENT, device->p_uuid[UI_CURRENT]); | |
b411b363 | 963 | } else { |
d0180171 | 964 | drbd_err(device, "device->p_uuid is NULL! BUG\n"); |
b411b363 PR |
965 | } |
966 | } | |
967 | ||
62b0da3a LE |
968 | if (!(os.conn == C_VERIFY_S || os.conn == C_VERIFY_T)) { |
969 | /* for verify runs, we don't update uuids here, | |
970 | * so there would be nothing to report. */ | |
b30ab791 AG |
971 | drbd_uuid_set_bm(device, 0UL); |
972 | drbd_print_uuids(device, "updated UUIDs"); | |
973 | if (device->p_uuid) { | |
62b0da3a LE |
974 | /* Now the two UUID sets are equal, update what we |
975 | * know of the peer. */ | |
976 | int i; | |
977 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) | |
b30ab791 | 978 | device->p_uuid[i] = device->ldev->md.uuid[i]; |
62b0da3a | 979 | } |
b411b363 PR |
980 | } |
981 | } | |
982 | ||
b30ab791 | 983 | _drbd_set_state(device, ns, CS_VERBOSE, NULL); |
b411b363 | 984 | out_unlock: |
0500813f | 985 | spin_unlock_irq(&device->resource->req_lock); |
26a96110 LE |
986 | |
987 | /* If we have been sync source, and have an effective fencing-policy, | |
988 | * once *all* volumes are back in sync, call "unfence". */ | |
989 | if (os.conn == C_SYNC_SOURCE) { | |
990 | enum drbd_disk_state disk_state = D_MASK; | |
991 | enum drbd_disk_state pdsk_state = D_MASK; | |
992 | enum drbd_fencing_p fp = FP_DONT_CARE; | |
993 | ||
994 | rcu_read_lock(); | |
995 | fp = rcu_dereference(device->ldev->disk_conf)->fencing; | |
996 | if (fp != FP_DONT_CARE) { | |
997 | struct drbd_peer_device *peer_device; | |
998 | int vnr; | |
999 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { | |
1000 | struct drbd_device *device = peer_device->device; | |
1001 | disk_state = min_t(enum drbd_disk_state, disk_state, device->state.disk); | |
1002 | pdsk_state = min_t(enum drbd_disk_state, pdsk_state, device->state.pdsk); | |
1003 | } | |
1004 | } | |
1005 | rcu_read_unlock(); | |
1006 | if (disk_state == D_UP_TO_DATE && pdsk_state == D_UP_TO_DATE) | |
1007 | conn_khelper(connection, "unfence-peer"); | |
1008 | } | |
1009 | ||
b30ab791 | 1010 | put_ldev(device); |
b411b363 | 1011 | out: |
b30ab791 AG |
1012 | device->rs_total = 0; |
1013 | device->rs_failed = 0; | |
1014 | device->rs_paused = 0; | |
58ffa580 LE |
1015 | |
1016 | /* reset start sector, if we reached end of device */ | |
b30ab791 AG |
1017 | if (verify_done && device->ov_left == 0) |
1018 | device->ov_start_sector = 0; | |
b411b363 | 1019 | |
b30ab791 | 1020 | drbd_md_sync(device); |
13d42685 | 1021 | |
b411b363 | 1022 | if (khelper_cmd) |
b30ab791 | 1023 | drbd_khelper(device, khelper_cmd); |
b411b363 PR |
1024 | |
1025 | return 1; | |
1026 | } | |
1027 | ||
1028 | /* helper */ | |
b30ab791 | 1029 | static void move_to_net_ee_or_free(struct drbd_device *device, struct drbd_peer_request *peer_req) |
b411b363 | 1030 | { |
045417f7 | 1031 | if (drbd_peer_req_has_active_page(peer_req)) { |
b411b363 | 1032 | /* This might happen if sendpage() has not finished */ |
ba6bee98 | 1033 | int i = PFN_UP(peer_req->i.size); |
b30ab791 AG |
1034 | atomic_add(i, &device->pp_in_use_by_net); |
1035 | atomic_sub(i, &device->pp_in_use); | |
0500813f | 1036 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 1037 | list_add_tail(&peer_req->w.list, &device->net_ee); |
0500813f | 1038 | spin_unlock_irq(&device->resource->req_lock); |
435f0740 | 1039 | wake_up(&drbd_pp_wait); |
b411b363 | 1040 | } else |
b30ab791 | 1041 | drbd_free_peer_req(device, peer_req); |
b411b363 PR |
1042 | } |
1043 | ||
1044 | /** | |
1045 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST | |
b411b363 PR |
1046 | * @w: work object. |
1047 | * @cancel: The connection will be closed anyways | |
1048 | */ | |
99920dc5 | 1049 | int w_e_end_data_req(struct drbd_work *w, int cancel) |
b411b363 | 1050 | { |
a8cd15ba | 1051 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
1052 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
1053 | struct drbd_device *device = peer_device->device; | |
99920dc5 | 1054 | int err; |
b411b363 PR |
1055 | |
1056 | if (unlikely(cancel)) { | |
b30ab791 AG |
1057 | drbd_free_peer_req(device, peer_req); |
1058 | dec_unacked(device); | |
99920dc5 | 1059 | return 0; |
b411b363 PR |
1060 | } |
1061 | ||
db830c46 | 1062 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
6780139c | 1063 | err = drbd_send_block(peer_device, P_DATA_REPLY, peer_req); |
b411b363 PR |
1064 | } else { |
1065 | if (__ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 1066 | drbd_err(device, "Sending NegDReply. sector=%llus.\n", |
db830c46 | 1067 | (unsigned long long)peer_req->i.sector); |
b411b363 | 1068 | |
6780139c | 1069 | err = drbd_send_ack(peer_device, P_NEG_DREPLY, peer_req); |
b411b363 PR |
1070 | } |
1071 | ||
b30ab791 | 1072 | dec_unacked(device); |
b411b363 | 1073 | |
b30ab791 | 1074 | move_to_net_ee_or_free(device, peer_req); |
b411b363 | 1075 | |
99920dc5 | 1076 | if (unlikely(err)) |
d0180171 | 1077 | drbd_err(device, "drbd_send_block() failed\n"); |
99920dc5 | 1078 | return err; |
b411b363 PR |
1079 | } |
1080 | ||
700ca8c0 PR |
1081 | static bool all_zero(struct drbd_peer_request *peer_req) |
1082 | { | |
1083 | struct page *page = peer_req->pages; | |
1084 | unsigned int len = peer_req->i.size; | |
1085 | ||
1086 | page_chain_for_each(page) { | |
1087 | unsigned int l = min_t(unsigned int, len, PAGE_SIZE); | |
1088 | unsigned int i, words = l / sizeof(long); | |
1089 | unsigned long *d; | |
1090 | ||
1091 | d = kmap_atomic(page); | |
1092 | for (i = 0; i < words; i++) { | |
1093 | if (d[i]) { | |
1094 | kunmap_atomic(d); | |
1095 | return false; | |
1096 | } | |
1097 | } | |
1098 | kunmap_atomic(d); | |
1099 | len -= l; | |
1100 | } | |
1101 | ||
1102 | return true; | |
1103 | } | |
1104 | ||
b411b363 | 1105 | /** |
a209b4ae | 1106 | * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUEST |
b411b363 PR |
1107 | * @w: work object. |
1108 | * @cancel: The connection will be closed anyways | |
1109 | */ | |
99920dc5 | 1110 | int w_e_end_rsdata_req(struct drbd_work *w, int cancel) |
b411b363 | 1111 | { |
a8cd15ba | 1112 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
1113 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
1114 | struct drbd_device *device = peer_device->device; | |
99920dc5 | 1115 | int err; |
b411b363 PR |
1116 | |
1117 | if (unlikely(cancel)) { | |
b30ab791 AG |
1118 | drbd_free_peer_req(device, peer_req); |
1119 | dec_unacked(device); | |
99920dc5 | 1120 | return 0; |
b411b363 PR |
1121 | } |
1122 | ||
b30ab791 AG |
1123 | if (get_ldev_if_state(device, D_FAILED)) { |
1124 | drbd_rs_complete_io(device, peer_req->i.sector); | |
1125 | put_ldev(device); | |
b411b363 PR |
1126 | } |
1127 | ||
b30ab791 | 1128 | if (device->state.conn == C_AHEAD) { |
6780139c | 1129 | err = drbd_send_ack(peer_device, P_RS_CANCEL, peer_req); |
db830c46 | 1130 | } else if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b30ab791 AG |
1131 | if (likely(device->state.pdsk >= D_INCONSISTENT)) { |
1132 | inc_rs_pending(device); | |
700ca8c0 PR |
1133 | if (peer_req->flags & EE_RS_THIN_REQ && all_zero(peer_req)) |
1134 | err = drbd_send_rs_deallocated(peer_device, peer_req); | |
1135 | else | |
1136 | err = drbd_send_block(peer_device, P_RS_DATA_REPLY, peer_req); | |
b411b363 PR |
1137 | } else { |
1138 | if (__ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 1139 | drbd_err(device, "Not sending RSDataReply, " |
b411b363 | 1140 | "partner DISKLESS!\n"); |
99920dc5 | 1141 | err = 0; |
b411b363 PR |
1142 | } |
1143 | } else { | |
1144 | if (__ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 1145 | drbd_err(device, "Sending NegRSDReply. sector %llus.\n", |
db830c46 | 1146 | (unsigned long long)peer_req->i.sector); |
b411b363 | 1147 | |
6780139c | 1148 | err = drbd_send_ack(peer_device, P_NEG_RS_DREPLY, peer_req); |
b411b363 PR |
1149 | |
1150 | /* update resync data with failure */ | |
b30ab791 | 1151 | drbd_rs_failed_io(device, peer_req->i.sector, peer_req->i.size); |
b411b363 PR |
1152 | } |
1153 | ||
b30ab791 | 1154 | dec_unacked(device); |
b411b363 | 1155 | |
b30ab791 | 1156 | move_to_net_ee_or_free(device, peer_req); |
b411b363 | 1157 | |
99920dc5 | 1158 | if (unlikely(err)) |
d0180171 | 1159 | drbd_err(device, "drbd_send_block() failed\n"); |
99920dc5 | 1160 | return err; |
b411b363 PR |
1161 | } |
1162 | ||
99920dc5 | 1163 | int w_e_end_csum_rs_req(struct drbd_work *w, int cancel) |
b411b363 | 1164 | { |
a8cd15ba | 1165 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
1166 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
1167 | struct drbd_device *device = peer_device->device; | |
b411b363 PR |
1168 | struct digest_info *di; |
1169 | int digest_size; | |
1170 | void *digest = NULL; | |
99920dc5 | 1171 | int err, eq = 0; |
b411b363 PR |
1172 | |
1173 | if (unlikely(cancel)) { | |
b30ab791 AG |
1174 | drbd_free_peer_req(device, peer_req); |
1175 | dec_unacked(device); | |
99920dc5 | 1176 | return 0; |
b411b363 PR |
1177 | } |
1178 | ||
b30ab791 AG |
1179 | if (get_ldev(device)) { |
1180 | drbd_rs_complete_io(device, peer_req->i.sector); | |
1181 | put_ldev(device); | |
1d53f09e | 1182 | } |
b411b363 | 1183 | |
db830c46 | 1184 | di = peer_req->digest; |
b411b363 | 1185 | |
db830c46 | 1186 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1187 | /* quick hack to try to avoid a race against reconfiguration. |
1188 | * a real fix would be much more involved, | |
1189 | * introducing more locking mechanisms */ | |
6780139c | 1190 | if (peer_device->connection->csums_tfm) { |
3d0e6375 | 1191 | digest_size = crypto_shash_digestsize(peer_device->connection->csums_tfm); |
0b0ba1ef | 1192 | D_ASSERT(device, digest_size == di->digest_size); |
b411b363 PR |
1193 | digest = kmalloc(digest_size, GFP_NOIO); |
1194 | } | |
1195 | if (digest) { | |
6780139c | 1196 | drbd_csum_ee(peer_device->connection->csums_tfm, peer_req, digest); |
b411b363 PR |
1197 | eq = !memcmp(digest, di->digest, digest_size); |
1198 | kfree(digest); | |
1199 | } | |
1200 | ||
1201 | if (eq) { | |
b30ab791 | 1202 | drbd_set_in_sync(device, peer_req->i.sector, peer_req->i.size); |
676396d5 | 1203 | /* rs_same_csums unit is BM_BLOCK_SIZE */ |
b30ab791 | 1204 | device->rs_same_csum += peer_req->i.size >> BM_BLOCK_SHIFT; |
6780139c | 1205 | err = drbd_send_ack(peer_device, P_RS_IS_IN_SYNC, peer_req); |
b411b363 | 1206 | } else { |
b30ab791 | 1207 | inc_rs_pending(device); |
db830c46 AG |
1208 | peer_req->block_id = ID_SYNCER; /* By setting block_id, digest pointer becomes invalid! */ |
1209 | peer_req->flags &= ~EE_HAS_DIGEST; /* This peer request no longer has a digest pointer */ | |
204bba99 | 1210 | kfree(di); |
6780139c | 1211 | err = drbd_send_block(peer_device, P_RS_DATA_REPLY, peer_req); |
b411b363 PR |
1212 | } |
1213 | } else { | |
6780139c | 1214 | err = drbd_send_ack(peer_device, P_NEG_RS_DREPLY, peer_req); |
b411b363 | 1215 | if (__ratelimit(&drbd_ratelimit_state)) |
d0180171 | 1216 | drbd_err(device, "Sending NegDReply. I guess it gets messy.\n"); |
b411b363 PR |
1217 | } |
1218 | ||
b30ab791 AG |
1219 | dec_unacked(device); |
1220 | move_to_net_ee_or_free(device, peer_req); | |
b411b363 | 1221 | |
99920dc5 | 1222 | if (unlikely(err)) |
d0180171 | 1223 | drbd_err(device, "drbd_send_block/ack() failed\n"); |
99920dc5 | 1224 | return err; |
b411b363 PR |
1225 | } |
1226 | ||
99920dc5 | 1227 | int w_e_end_ov_req(struct drbd_work *w, int cancel) |
b411b363 | 1228 | { |
a8cd15ba | 1229 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
1230 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
1231 | struct drbd_device *device = peer_device->device; | |
db830c46 AG |
1232 | sector_t sector = peer_req->i.sector; |
1233 | unsigned int size = peer_req->i.size; | |
b411b363 PR |
1234 | int digest_size; |
1235 | void *digest; | |
99920dc5 | 1236 | int err = 0; |
b411b363 PR |
1237 | |
1238 | if (unlikely(cancel)) | |
1239 | goto out; | |
1240 | ||
3d0e6375 | 1241 | digest_size = crypto_shash_digestsize(peer_device->connection->verify_tfm); |
b411b363 | 1242 | digest = kmalloc(digest_size, GFP_NOIO); |
8f21420e | 1243 | if (!digest) { |
99920dc5 | 1244 | err = 1; /* terminate the connection in case the allocation failed */ |
8f21420e | 1245 | goto out; |
b411b363 PR |
1246 | } |
1247 | ||
db830c46 | 1248 | if (likely(!(peer_req->flags & EE_WAS_ERROR))) |
6780139c | 1249 | drbd_csum_ee(peer_device->connection->verify_tfm, peer_req, digest); |
8f21420e PR |
1250 | else |
1251 | memset(digest, 0, digest_size); | |
1252 | ||
53ea4331 LE |
1253 | /* Free e and pages before send. |
1254 | * In case we block on congestion, we could otherwise run into | |
1255 | * some distributed deadlock, if the other side blocks on | |
1256 | * congestion as well, because our receiver blocks in | |
c37c8ecf | 1257 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
b30ab791 | 1258 | drbd_free_peer_req(device, peer_req); |
db830c46 | 1259 | peer_req = NULL; |
b30ab791 | 1260 | inc_rs_pending(device); |
6780139c | 1261 | err = drbd_send_drequest_csum(peer_device, sector, size, digest, digest_size, P_OV_REPLY); |
99920dc5 | 1262 | if (err) |
b30ab791 | 1263 | dec_rs_pending(device); |
8f21420e PR |
1264 | kfree(digest); |
1265 | ||
b411b363 | 1266 | out: |
db830c46 | 1267 | if (peer_req) |
b30ab791 AG |
1268 | drbd_free_peer_req(device, peer_req); |
1269 | dec_unacked(device); | |
99920dc5 | 1270 | return err; |
b411b363 PR |
1271 | } |
1272 | ||
b30ab791 | 1273 | void drbd_ov_out_of_sync_found(struct drbd_device *device, sector_t sector, int size) |
b411b363 | 1274 | { |
b30ab791 AG |
1275 | if (device->ov_last_oos_start + device->ov_last_oos_size == sector) { |
1276 | device->ov_last_oos_size += size>>9; | |
b411b363 | 1277 | } else { |
b30ab791 AG |
1278 | device->ov_last_oos_start = sector; |
1279 | device->ov_last_oos_size = size>>9; | |
b411b363 | 1280 | } |
b30ab791 | 1281 | drbd_set_out_of_sync(device, sector, size); |
b411b363 PR |
1282 | } |
1283 | ||
99920dc5 | 1284 | int w_e_end_ov_reply(struct drbd_work *w, int cancel) |
b411b363 | 1285 | { |
a8cd15ba | 1286 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
1287 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
1288 | struct drbd_device *device = peer_device->device; | |
b411b363 | 1289 | struct digest_info *di; |
b411b363 | 1290 | void *digest; |
db830c46 AG |
1291 | sector_t sector = peer_req->i.sector; |
1292 | unsigned int size = peer_req->i.size; | |
53ea4331 | 1293 | int digest_size; |
99920dc5 | 1294 | int err, eq = 0; |
58ffa580 | 1295 | bool stop_sector_reached = false; |
b411b363 PR |
1296 | |
1297 | if (unlikely(cancel)) { | |
b30ab791 AG |
1298 | drbd_free_peer_req(device, peer_req); |
1299 | dec_unacked(device); | |
99920dc5 | 1300 | return 0; |
b411b363 PR |
1301 | } |
1302 | ||
1303 | /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all | |
1304 | * the resync lru has been cleaned up already */ | |
b30ab791 AG |
1305 | if (get_ldev(device)) { |
1306 | drbd_rs_complete_io(device, peer_req->i.sector); | |
1307 | put_ldev(device); | |
1d53f09e | 1308 | } |
b411b363 | 1309 | |
db830c46 | 1310 | di = peer_req->digest; |
b411b363 | 1311 | |
db830c46 | 1312 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
3d0e6375 | 1313 | digest_size = crypto_shash_digestsize(peer_device->connection->verify_tfm); |
b411b363 PR |
1314 | digest = kmalloc(digest_size, GFP_NOIO); |
1315 | if (digest) { | |
6780139c | 1316 | drbd_csum_ee(peer_device->connection->verify_tfm, peer_req, digest); |
b411b363 | 1317 | |
0b0ba1ef | 1318 | D_ASSERT(device, digest_size == di->digest_size); |
b411b363 PR |
1319 | eq = !memcmp(digest, di->digest, digest_size); |
1320 | kfree(digest); | |
1321 | } | |
b411b363 PR |
1322 | } |
1323 | ||
9676c760 LE |
1324 | /* Free peer_req and pages before send. |
1325 | * In case we block on congestion, we could otherwise run into | |
1326 | * some distributed deadlock, if the other side blocks on | |
1327 | * congestion as well, because our receiver blocks in | |
c37c8ecf | 1328 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
b30ab791 | 1329 | drbd_free_peer_req(device, peer_req); |
b411b363 | 1330 | if (!eq) |
b30ab791 | 1331 | drbd_ov_out_of_sync_found(device, sector, size); |
b411b363 | 1332 | else |
b30ab791 | 1333 | ov_out_of_sync_print(device); |
b411b363 | 1334 | |
6780139c | 1335 | err = drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, size, |
fa79abd8 | 1336 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); |
b411b363 | 1337 | |
b30ab791 | 1338 | dec_unacked(device); |
b411b363 | 1339 | |
b30ab791 | 1340 | --device->ov_left; |
ea5442af LE |
1341 | |
1342 | /* let's advance progress step marks only for every other megabyte */ | |
b30ab791 AG |
1343 | if ((device->ov_left & 0x200) == 0x200) |
1344 | drbd_advance_rs_marks(device, device->ov_left); | |
ea5442af | 1345 | |
b30ab791 AG |
1346 | stop_sector_reached = verify_can_do_stop_sector(device) && |
1347 | (sector + (size>>9)) >= device->ov_stop_sector; | |
58ffa580 | 1348 | |
b30ab791 AG |
1349 | if (device->ov_left == 0 || stop_sector_reached) { |
1350 | ov_out_of_sync_print(device); | |
1351 | drbd_resync_finished(device); | |
b411b363 PR |
1352 | } |
1353 | ||
99920dc5 | 1354 | return err; |
b411b363 PR |
1355 | } |
1356 | ||
b6dd1a89 LE |
1357 | /* FIXME |
1358 | * We need to track the number of pending barrier acks, | |
1359 | * and to be able to wait for them. | |
1360 | * See also comment in drbd_adm_attach before drbd_suspend_io. | |
1361 | */ | |
bde89a9e | 1362 | static int drbd_send_barrier(struct drbd_connection *connection) |
b411b363 | 1363 | { |
9f5bdc33 | 1364 | struct p_barrier *p; |
b6dd1a89 | 1365 | struct drbd_socket *sock; |
b411b363 | 1366 | |
bde89a9e AG |
1367 | sock = &connection->data; |
1368 | p = conn_prepare_command(connection, sock); | |
9f5bdc33 AG |
1369 | if (!p) |
1370 | return -EIO; | |
bde89a9e | 1371 | p->barrier = connection->send.current_epoch_nr; |
b6dd1a89 | 1372 | p->pad = 0; |
bde89a9e | 1373 | connection->send.current_epoch_writes = 0; |
84d34f2f | 1374 | connection->send.last_sent_barrier_jif = jiffies; |
b6dd1a89 | 1375 | |
bde89a9e | 1376 | return conn_send_command(connection, sock, P_BARRIER, sizeof(*p), NULL, 0); |
b411b363 PR |
1377 | } |
1378 | ||
c51a0ef3 LE |
1379 | static int pd_send_unplug_remote(struct drbd_peer_device *pd) |
1380 | { | |
1381 | struct drbd_socket *sock = &pd->connection->data; | |
1382 | if (!drbd_prepare_command(pd, sock)) | |
1383 | return -EIO; | |
1384 | return drbd_send_command(pd, sock, P_UNPLUG_REMOTE, 0, NULL, 0); | |
1385 | } | |
1386 | ||
99920dc5 | 1387 | int w_send_write_hint(struct drbd_work *w, int cancel) |
b411b363 | 1388 | { |
84b8c06b AG |
1389 | struct drbd_device *device = |
1390 | container_of(w, struct drbd_device, unplug_work); | |
9f5bdc33 | 1391 | |
b411b363 | 1392 | if (cancel) |
99920dc5 | 1393 | return 0; |
c51a0ef3 | 1394 | return pd_send_unplug_remote(first_peer_device(device)); |
b411b363 PR |
1395 | } |
1396 | ||
bde89a9e | 1397 | static void re_init_if_first_write(struct drbd_connection *connection, unsigned int epoch) |
4eb9b3cb | 1398 | { |
bde89a9e AG |
1399 | if (!connection->send.seen_any_write_yet) { |
1400 | connection->send.seen_any_write_yet = true; | |
1401 | connection->send.current_epoch_nr = epoch; | |
1402 | connection->send.current_epoch_writes = 0; | |
84d34f2f | 1403 | connection->send.last_sent_barrier_jif = jiffies; |
4eb9b3cb LE |
1404 | } |
1405 | } | |
1406 | ||
bde89a9e | 1407 | static void maybe_send_barrier(struct drbd_connection *connection, unsigned int epoch) |
4eb9b3cb LE |
1408 | { |
1409 | /* re-init if first write on this connection */ | |
bde89a9e | 1410 | if (!connection->send.seen_any_write_yet) |
4eb9b3cb | 1411 | return; |
bde89a9e AG |
1412 | if (connection->send.current_epoch_nr != epoch) { |
1413 | if (connection->send.current_epoch_writes) | |
1414 | drbd_send_barrier(connection); | |
1415 | connection->send.current_epoch_nr = epoch; | |
4eb9b3cb LE |
1416 | } |
1417 | } | |
1418 | ||
8f7bed77 | 1419 | int w_send_out_of_sync(struct drbd_work *w, int cancel) |
73a01a18 PR |
1420 | { |
1421 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
84b8c06b | 1422 | struct drbd_device *device = req->device; |
44a4d551 LE |
1423 | struct drbd_peer_device *const peer_device = first_peer_device(device); |
1424 | struct drbd_connection *const connection = peer_device->connection; | |
99920dc5 | 1425 | int err; |
73a01a18 PR |
1426 | |
1427 | if (unlikely(cancel)) { | |
8554df1c | 1428 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1429 | return 0; |
73a01a18 | 1430 | } |
e5f891b2 | 1431 | req->pre_send_jif = jiffies; |
73a01a18 | 1432 | |
bde89a9e | 1433 | /* this time, no connection->send.current_epoch_writes++; |
b6dd1a89 LE |
1434 | * If it was sent, it was the closing barrier for the last |
1435 | * replicated epoch, before we went into AHEAD mode. | |
1436 | * No more barriers will be sent, until we leave AHEAD mode again. */ | |
bde89a9e | 1437 | maybe_send_barrier(connection, req->epoch); |
b6dd1a89 | 1438 | |
44a4d551 | 1439 | err = drbd_send_out_of_sync(peer_device, req); |
8554df1c | 1440 | req_mod(req, OOS_HANDED_TO_NETWORK); |
73a01a18 | 1441 | |
99920dc5 | 1442 | return err; |
73a01a18 PR |
1443 | } |
1444 | ||
b411b363 PR |
1445 | /** |
1446 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request | |
b411b363 PR |
1447 | * @w: work object. |
1448 | * @cancel: The connection will be closed anyways | |
1449 | */ | |
99920dc5 | 1450 | int w_send_dblock(struct drbd_work *w, int cancel) |
b411b363 PR |
1451 | { |
1452 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
84b8c06b | 1453 | struct drbd_device *device = req->device; |
44a4d551 LE |
1454 | struct drbd_peer_device *const peer_device = first_peer_device(device); |
1455 | struct drbd_connection *connection = peer_device->connection; | |
c51a0ef3 | 1456 | bool do_send_unplug = req->rq_state & RQ_UNPLUG; |
99920dc5 | 1457 | int err; |
b411b363 PR |
1458 | |
1459 | if (unlikely(cancel)) { | |
8554df1c | 1460 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1461 | return 0; |
b411b363 | 1462 | } |
e5f891b2 | 1463 | req->pre_send_jif = jiffies; |
b411b363 | 1464 | |
bde89a9e AG |
1465 | re_init_if_first_write(connection, req->epoch); |
1466 | maybe_send_barrier(connection, req->epoch); | |
1467 | connection->send.current_epoch_writes++; | |
b6dd1a89 | 1468 | |
44a4d551 | 1469 | err = drbd_send_dblock(peer_device, req); |
99920dc5 | 1470 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK); |
b411b363 | 1471 | |
c51a0ef3 LE |
1472 | if (do_send_unplug && !err) |
1473 | pd_send_unplug_remote(peer_device); | |
1474 | ||
99920dc5 | 1475 | return err; |
b411b363 PR |
1476 | } |
1477 | ||
1478 | /** | |
1479 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet | |
b411b363 PR |
1480 | * @w: work object. |
1481 | * @cancel: The connection will be closed anyways | |
1482 | */ | |
99920dc5 | 1483 | int w_send_read_req(struct drbd_work *w, int cancel) |
b411b363 PR |
1484 | { |
1485 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
84b8c06b | 1486 | struct drbd_device *device = req->device; |
44a4d551 LE |
1487 | struct drbd_peer_device *const peer_device = first_peer_device(device); |
1488 | struct drbd_connection *connection = peer_device->connection; | |
c51a0ef3 | 1489 | bool do_send_unplug = req->rq_state & RQ_UNPLUG; |
99920dc5 | 1490 | int err; |
b411b363 PR |
1491 | |
1492 | if (unlikely(cancel)) { | |
8554df1c | 1493 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1494 | return 0; |
b411b363 | 1495 | } |
e5f891b2 | 1496 | req->pre_send_jif = jiffies; |
b411b363 | 1497 | |
b6dd1a89 LE |
1498 | /* Even read requests may close a write epoch, |
1499 | * if there was any yet. */ | |
bde89a9e | 1500 | maybe_send_barrier(connection, req->epoch); |
b6dd1a89 | 1501 | |
44a4d551 | 1502 | err = drbd_send_drequest(peer_device, P_DATA_REQUEST, req->i.sector, req->i.size, |
6c1005e7 | 1503 | (unsigned long)req); |
b411b363 | 1504 | |
99920dc5 | 1505 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK); |
b411b363 | 1506 | |
c51a0ef3 LE |
1507 | if (do_send_unplug && !err) |
1508 | pd_send_unplug_remote(peer_device); | |
1509 | ||
99920dc5 | 1510 | return err; |
b411b363 PR |
1511 | } |
1512 | ||
99920dc5 | 1513 | int w_restart_disk_io(struct drbd_work *w, int cancel) |
265be2d0 PR |
1514 | { |
1515 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
84b8c06b | 1516 | struct drbd_device *device = req->device; |
265be2d0 | 1517 | |
0778286a | 1518 | if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG) |
4dd726f0 | 1519 | drbd_al_begin_io(device, &req->i); |
265be2d0 | 1520 | |
abfc426d CH |
1521 | req->private_bio = bio_alloc_clone(device->ldev->backing_bdev, |
1522 | req->master_bio, GFP_NOIO, | |
ae7153f1 | 1523 | &drbd_io_bio_set); |
ae7153f1 CH |
1524 | req->private_bio->bi_private = req; |
1525 | req->private_bio->bi_end_io = drbd_request_endio; | |
ed00aabd | 1526 | submit_bio_noacct(req->private_bio); |
265be2d0 | 1527 | |
99920dc5 | 1528 | return 0; |
265be2d0 PR |
1529 | } |
1530 | ||
b30ab791 | 1531 | static int _drbd_may_sync_now(struct drbd_device *device) |
b411b363 | 1532 | { |
b30ab791 | 1533 | struct drbd_device *odev = device; |
95f8efd0 | 1534 | int resync_after; |
b411b363 PR |
1535 | |
1536 | while (1) { | |
a3f8f7dc | 1537 | if (!odev->ldev || odev->state.disk == D_DISKLESS) |
438c8374 | 1538 | return 1; |
daeda1cc | 1539 | rcu_read_lock(); |
95f8efd0 | 1540 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after; |
daeda1cc | 1541 | rcu_read_unlock(); |
95f8efd0 | 1542 | if (resync_after == -1) |
b411b363 | 1543 | return 1; |
b30ab791 | 1544 | odev = minor_to_device(resync_after); |
a3f8f7dc | 1545 | if (!odev) |
841ce241 | 1546 | return 1; |
b411b363 PR |
1547 | if ((odev->state.conn >= C_SYNC_SOURCE && |
1548 | odev->state.conn <= C_PAUSED_SYNC_T) || | |
1549 | odev->state.aftr_isp || odev->state.peer_isp || | |
1550 | odev->state.user_isp) | |
1551 | return 0; | |
1552 | } | |
1553 | } | |
1554 | ||
1555 | /** | |
28bc3b8c | 1556 | * drbd_pause_after() - Pause resync on all devices that may not resync now |
b30ab791 | 1557 | * @device: DRBD device. |
b411b363 PR |
1558 | * |
1559 | * Called from process context only (admin command and after_state_ch). | |
1560 | */ | |
28bc3b8c | 1561 | static bool drbd_pause_after(struct drbd_device *device) |
b411b363 | 1562 | { |
28bc3b8c | 1563 | bool changed = false; |
54761697 | 1564 | struct drbd_device *odev; |
28bc3b8c | 1565 | int i; |
b411b363 | 1566 | |
695d08fa | 1567 | rcu_read_lock(); |
05a10ec7 | 1568 | idr_for_each_entry(&drbd_devices, odev, i) { |
b411b363 PR |
1569 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
1570 | continue; | |
28bc3b8c AG |
1571 | if (!_drbd_may_sync_now(odev) && |
1572 | _drbd_set_state(_NS(odev, aftr_isp, 1), | |
1573 | CS_HARD, NULL) != SS_NOTHING_TO_DO) | |
1574 | changed = true; | |
b411b363 | 1575 | } |
695d08fa | 1576 | rcu_read_unlock(); |
b411b363 | 1577 | |
28bc3b8c | 1578 | return changed; |
b411b363 PR |
1579 | } |
1580 | ||
1581 | /** | |
28bc3b8c | 1582 | * drbd_resume_next() - Resume resync on all devices that may resync now |
b30ab791 | 1583 | * @device: DRBD device. |
b411b363 PR |
1584 | * |
1585 | * Called from process context only (admin command and worker). | |
1586 | */ | |
28bc3b8c | 1587 | static bool drbd_resume_next(struct drbd_device *device) |
b411b363 | 1588 | { |
28bc3b8c | 1589 | bool changed = false; |
54761697 | 1590 | struct drbd_device *odev; |
28bc3b8c | 1591 | int i; |
b411b363 | 1592 | |
695d08fa | 1593 | rcu_read_lock(); |
05a10ec7 | 1594 | idr_for_each_entry(&drbd_devices, odev, i) { |
b411b363 PR |
1595 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
1596 | continue; | |
1597 | if (odev->state.aftr_isp) { | |
28bc3b8c AG |
1598 | if (_drbd_may_sync_now(odev) && |
1599 | _drbd_set_state(_NS(odev, aftr_isp, 0), | |
1600 | CS_HARD, NULL) != SS_NOTHING_TO_DO) | |
1601 | changed = true; | |
b411b363 PR |
1602 | } |
1603 | } | |
695d08fa | 1604 | rcu_read_unlock(); |
28bc3b8c | 1605 | return changed; |
b411b363 PR |
1606 | } |
1607 | ||
b30ab791 | 1608 | void resume_next_sg(struct drbd_device *device) |
b411b363 | 1609 | { |
28bc3b8c AG |
1610 | lock_all_resources(); |
1611 | drbd_resume_next(device); | |
1612 | unlock_all_resources(); | |
b411b363 PR |
1613 | } |
1614 | ||
b30ab791 | 1615 | void suspend_other_sg(struct drbd_device *device) |
b411b363 | 1616 | { |
28bc3b8c AG |
1617 | lock_all_resources(); |
1618 | drbd_pause_after(device); | |
1619 | unlock_all_resources(); | |
b411b363 PR |
1620 | } |
1621 | ||
28bc3b8c | 1622 | /* caller must lock_all_resources() */ |
b30ab791 | 1623 | enum drbd_ret_code drbd_resync_after_valid(struct drbd_device *device, int o_minor) |
b411b363 | 1624 | { |
54761697 | 1625 | struct drbd_device *odev; |
95f8efd0 | 1626 | int resync_after; |
b411b363 PR |
1627 | |
1628 | if (o_minor == -1) | |
1629 | return NO_ERROR; | |
a3f8f7dc | 1630 | if (o_minor < -1 || o_minor > MINORMASK) |
95f8efd0 | 1631 | return ERR_RESYNC_AFTER; |
b411b363 PR |
1632 | |
1633 | /* check for loops */ | |
b30ab791 | 1634 | odev = minor_to_device(o_minor); |
b411b363 | 1635 | while (1) { |
b30ab791 | 1636 | if (odev == device) |
95f8efd0 | 1637 | return ERR_RESYNC_AFTER_CYCLE; |
b411b363 | 1638 | |
a3f8f7dc LE |
1639 | /* You are free to depend on diskless, non-existing, |
1640 | * or not yet/no longer existing minors. | |
1641 | * We only reject dependency loops. | |
1642 | * We cannot follow the dependency chain beyond a detached or | |
1643 | * missing minor. | |
1644 | */ | |
1645 | if (!odev || !odev->ldev || odev->state.disk == D_DISKLESS) | |
1646 | return NO_ERROR; | |
1647 | ||
daeda1cc | 1648 | rcu_read_lock(); |
95f8efd0 | 1649 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after; |
daeda1cc | 1650 | rcu_read_unlock(); |
b411b363 | 1651 | /* dependency chain ends here, no cycles. */ |
95f8efd0 | 1652 | if (resync_after == -1) |
b411b363 PR |
1653 | return NO_ERROR; |
1654 | ||
1655 | /* follow the dependency chain */ | |
b30ab791 | 1656 | odev = minor_to_device(resync_after); |
b411b363 PR |
1657 | } |
1658 | } | |
1659 | ||
28bc3b8c | 1660 | /* caller must lock_all_resources() */ |
b30ab791 | 1661 | void drbd_resync_after_changed(struct drbd_device *device) |
b411b363 | 1662 | { |
28bc3b8c | 1663 | int changed; |
b411b363 | 1664 | |
dc97b708 | 1665 | do { |
28bc3b8c AG |
1666 | changed = drbd_pause_after(device); |
1667 | changed |= drbd_resume_next(device); | |
1668 | } while (changed); | |
b411b363 PR |
1669 | } |
1670 | ||
b30ab791 | 1671 | void drbd_rs_controller_reset(struct drbd_device *device) |
9bd28d3c | 1672 | { |
8c40c7c4 | 1673 | struct gendisk *disk = device->ldev->backing_bdev->bd_disk; |
813472ce PR |
1674 | struct fifo_buffer *plan; |
1675 | ||
b30ab791 AG |
1676 | atomic_set(&device->rs_sect_in, 0); |
1677 | atomic_set(&device->rs_sect_ev, 0); | |
1678 | device->rs_in_flight = 0; | |
cb8432d6 | 1679 | device->rs_last_events = |
8446fe92 | 1680 | (int)part_stat_read_accum(disk->part0, sectors); |
813472ce PR |
1681 | |
1682 | /* Updating the RCU protected object in place is necessary since | |
1683 | this function gets called from atomic context. | |
1684 | It is valid since all other updates also lead to an completely | |
1685 | empty fifo */ | |
1686 | rcu_read_lock(); | |
b30ab791 | 1687 | plan = rcu_dereference(device->rs_plan_s); |
813472ce PR |
1688 | plan->total = 0; |
1689 | fifo_set(plan, 0); | |
1690 | rcu_read_unlock(); | |
9bd28d3c LE |
1691 | } |
1692 | ||
2bccef39 | 1693 | void start_resync_timer_fn(struct timer_list *t) |
1f04af33 | 1694 | { |
2bccef39 | 1695 | struct drbd_device *device = from_timer(device, t, start_resync_timer); |
ac0acb9e | 1696 | drbd_device_post_work(device, RS_START); |
1f04af33 PR |
1697 | } |
1698 | ||
ac0acb9e | 1699 | static void do_start_resync(struct drbd_device *device) |
1f04af33 | 1700 | { |
b30ab791 | 1701 | if (atomic_read(&device->unacked_cnt) || atomic_read(&device->rs_pending_cnt)) { |
ac0acb9e | 1702 | drbd_warn(device, "postponing start_resync ...\n"); |
b30ab791 AG |
1703 | device->start_resync_timer.expires = jiffies + HZ/10; |
1704 | add_timer(&device->start_resync_timer); | |
ac0acb9e | 1705 | return; |
1f04af33 PR |
1706 | } |
1707 | ||
b30ab791 AG |
1708 | drbd_start_resync(device, C_SYNC_SOURCE); |
1709 | clear_bit(AHEAD_TO_SYNC_SOURCE, &device->flags); | |
1f04af33 PR |
1710 | } |
1711 | ||
aaaba345 LE |
1712 | static bool use_checksum_based_resync(struct drbd_connection *connection, struct drbd_device *device) |
1713 | { | |
1714 | bool csums_after_crash_only; | |
1715 | rcu_read_lock(); | |
1716 | csums_after_crash_only = rcu_dereference(connection->net_conf)->csums_after_crash_only; | |
1717 | rcu_read_unlock(); | |
1718 | return connection->agreed_pro_version >= 89 && /* supported? */ | |
1719 | connection->csums_tfm && /* configured? */ | |
7e5fec31 | 1720 | (csums_after_crash_only == false /* use for each resync? */ |
aaaba345 LE |
1721 | || test_bit(CRASHED_PRIMARY, &device->flags)); /* or only after Primary crash? */ |
1722 | } | |
1723 | ||
b411b363 PR |
1724 | /** |
1725 | * drbd_start_resync() - Start the resync process | |
b30ab791 | 1726 | * @device: DRBD device. |
b411b363 PR |
1727 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET |
1728 | * | |
1729 | * This function might bring you directly into one of the | |
1730 | * C_PAUSED_SYNC_* states. | |
1731 | */ | |
b30ab791 | 1732 | void drbd_start_resync(struct drbd_device *device, enum drbd_conns side) |
b411b363 | 1733 | { |
44a4d551 LE |
1734 | struct drbd_peer_device *peer_device = first_peer_device(device); |
1735 | struct drbd_connection *connection = peer_device ? peer_device->connection : NULL; | |
b411b363 PR |
1736 | union drbd_state ns; |
1737 | int r; | |
1738 | ||
b30ab791 | 1739 | if (device->state.conn >= C_SYNC_SOURCE && device->state.conn < C_AHEAD) { |
d0180171 | 1740 | drbd_err(device, "Resync already running!\n"); |
b411b363 PR |
1741 | return; |
1742 | } | |
1743 | ||
d3d2948f RK |
1744 | if (!connection) { |
1745 | drbd_err(device, "No connection to peer, aborting!\n"); | |
1746 | return; | |
1747 | } | |
1748 | ||
b30ab791 | 1749 | if (!test_bit(B_RS_H_DONE, &device->flags)) { |
e64a3294 PR |
1750 | if (side == C_SYNC_TARGET) { |
1751 | /* Since application IO was locked out during C_WF_BITMAP_T and | |
1752 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET | |
1753 | we check that we might make the data inconsistent. */ | |
b30ab791 | 1754 | r = drbd_khelper(device, "before-resync-target"); |
e64a3294 PR |
1755 | r = (r >> 8) & 0xff; |
1756 | if (r > 0) { | |
d0180171 | 1757 | drbd_info(device, "before-resync-target handler returned %d, " |
09b9e797 | 1758 | "dropping connection.\n", r); |
44a4d551 | 1759 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
09b9e797 PR |
1760 | return; |
1761 | } | |
e64a3294 | 1762 | } else /* C_SYNC_SOURCE */ { |
b30ab791 | 1763 | r = drbd_khelper(device, "before-resync-source"); |
e64a3294 PR |
1764 | r = (r >> 8) & 0xff; |
1765 | if (r > 0) { | |
1766 | if (r == 3) { | |
d0180171 | 1767 | drbd_info(device, "before-resync-source handler returned %d, " |
e64a3294 PR |
1768 | "ignoring. Old userland tools?", r); |
1769 | } else { | |
d0180171 | 1770 | drbd_info(device, "before-resync-source handler returned %d, " |
e64a3294 | 1771 | "dropping connection.\n", r); |
44a4d551 | 1772 | conn_request_state(connection, |
a6b32bc3 | 1773 | NS(conn, C_DISCONNECTING), CS_HARD); |
e64a3294 PR |
1774 | return; |
1775 | } | |
1776 | } | |
09b9e797 | 1777 | } |
b411b363 PR |
1778 | } |
1779 | ||
44a4d551 | 1780 | if (current == connection->worker.task) { |
dad20554 | 1781 | /* The worker should not sleep waiting for state_mutex, |
e64a3294 | 1782 | that can take long */ |
b30ab791 AG |
1783 | if (!mutex_trylock(device->state_mutex)) { |
1784 | set_bit(B_RS_H_DONE, &device->flags); | |
1785 | device->start_resync_timer.expires = jiffies + HZ/5; | |
1786 | add_timer(&device->start_resync_timer); | |
e64a3294 PR |
1787 | return; |
1788 | } | |
1789 | } else { | |
b30ab791 | 1790 | mutex_lock(device->state_mutex); |
e64a3294 | 1791 | } |
b411b363 | 1792 | |
28bc3b8c AG |
1793 | lock_all_resources(); |
1794 | clear_bit(B_RS_H_DONE, &device->flags); | |
a700471b | 1795 | /* Did some connection breakage or IO error race with us? */ |
b30ab791 AG |
1796 | if (device->state.conn < C_CONNECTED |
1797 | || !get_ldev_if_state(device, D_NEGOTIATING)) { | |
28bc3b8c AG |
1798 | unlock_all_resources(); |
1799 | goto out; | |
b411b363 PR |
1800 | } |
1801 | ||
b30ab791 | 1802 | ns = drbd_read_state(device); |
b411b363 | 1803 | |
b30ab791 | 1804 | ns.aftr_isp = !_drbd_may_sync_now(device); |
b411b363 PR |
1805 | |
1806 | ns.conn = side; | |
1807 | ||
1808 | if (side == C_SYNC_TARGET) | |
1809 | ns.disk = D_INCONSISTENT; | |
1810 | else /* side == C_SYNC_SOURCE */ | |
1811 | ns.pdsk = D_INCONSISTENT; | |
1812 | ||
28bc3b8c | 1813 | r = _drbd_set_state(device, ns, CS_VERBOSE, NULL); |
b30ab791 | 1814 | ns = drbd_read_state(device); |
b411b363 PR |
1815 | |
1816 | if (ns.conn < C_CONNECTED) | |
1817 | r = SS_UNKNOWN_ERROR; | |
1818 | ||
1819 | if (r == SS_SUCCESS) { | |
b30ab791 | 1820 | unsigned long tw = drbd_bm_total_weight(device); |
1d7734a0 LE |
1821 | unsigned long now = jiffies; |
1822 | int i; | |
1823 | ||
b30ab791 AG |
1824 | device->rs_failed = 0; |
1825 | device->rs_paused = 0; | |
1826 | device->rs_same_csum = 0; | |
b30ab791 AG |
1827 | device->rs_last_sect_ev = 0; |
1828 | device->rs_total = tw; | |
1829 | device->rs_start = now; | |
1d7734a0 | 1830 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
b30ab791 AG |
1831 | device->rs_mark_left[i] = tw; |
1832 | device->rs_mark_time[i] = now; | |
1d7734a0 | 1833 | } |
28bc3b8c | 1834 | drbd_pause_after(device); |
5ab7d2c0 LE |
1835 | /* Forget potentially stale cached per resync extent bit-counts. |
1836 | * Open coded drbd_rs_cancel_all(device), we already have IRQs | |
1837 | * disabled, and know the disk state is ok. */ | |
1838 | spin_lock(&device->al_lock); | |
1839 | lc_reset(device->resync); | |
1840 | device->resync_locked = 0; | |
1841 | device->resync_wenr = LC_FREE; | |
1842 | spin_unlock(&device->al_lock); | |
b411b363 | 1843 | } |
28bc3b8c | 1844 | unlock_all_resources(); |
5a22db89 | 1845 | |
b411b363 | 1846 | if (r == SS_SUCCESS) { |
5ab7d2c0 | 1847 | wake_up(&device->al_wait); /* for lc_reset() above */ |
328e0f12 PR |
1848 | /* reset rs_last_bcast when a resync or verify is started, |
1849 | * to deal with potential jiffies wrap. */ | |
b30ab791 | 1850 | device->rs_last_bcast = jiffies - HZ; |
328e0f12 | 1851 | |
d0180171 | 1852 | drbd_info(device, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", |
b411b363 | 1853 | drbd_conn_str(ns.conn), |
b30ab791 AG |
1854 | (unsigned long) device->rs_total << (BM_BLOCK_SHIFT-10), |
1855 | (unsigned long) device->rs_total); | |
aaaba345 | 1856 | if (side == C_SYNC_TARGET) { |
b30ab791 | 1857 | device->bm_resync_fo = 0; |
aaaba345 LE |
1858 | device->use_csums = use_checksum_based_resync(connection, device); |
1859 | } else { | |
7e5fec31 | 1860 | device->use_csums = false; |
aaaba345 | 1861 | } |
6c922ed5 LE |
1862 | |
1863 | /* Since protocol 96, we must serialize drbd_gen_and_send_sync_uuid | |
1864 | * with w_send_oos, or the sync target will get confused as to | |
1865 | * how much bits to resync. We cannot do that always, because for an | |
1866 | * empty resync and protocol < 95, we need to do it here, as we call | |
1867 | * drbd_resync_finished from here in that case. | |
1868 | * We drbd_gen_and_send_sync_uuid here for protocol < 96, | |
1869 | * and from after_state_ch otherwise. */ | |
44a4d551 LE |
1870 | if (side == C_SYNC_SOURCE && connection->agreed_pro_version < 96) |
1871 | drbd_gen_and_send_sync_uuid(peer_device); | |
b411b363 | 1872 | |
44a4d551 | 1873 | if (connection->agreed_pro_version < 95 && device->rs_total == 0) { |
af85e8e8 LE |
1874 | /* This still has a race (about when exactly the peers |
1875 | * detect connection loss) that can lead to a full sync | |
1876 | * on next handshake. In 8.3.9 we fixed this with explicit | |
1877 | * resync-finished notifications, but the fix | |
1878 | * introduces a protocol change. Sleeping for some | |
1879 | * time longer than the ping interval + timeout on the | |
1880 | * SyncSource, to give the SyncTarget the chance to | |
1881 | * detect connection loss, then waiting for a ping | |
1882 | * response (implicit in drbd_resync_finished) reduces | |
1883 | * the race considerably, but does not solve it. */ | |
44ed167d PR |
1884 | if (side == C_SYNC_SOURCE) { |
1885 | struct net_conf *nc; | |
1886 | int timeo; | |
1887 | ||
1888 | rcu_read_lock(); | |
44a4d551 | 1889 | nc = rcu_dereference(connection->net_conf); |
44ed167d PR |
1890 | timeo = nc->ping_int * HZ + nc->ping_timeo * HZ / 9; |
1891 | rcu_read_unlock(); | |
1892 | schedule_timeout_interruptible(timeo); | |
1893 | } | |
b30ab791 | 1894 | drbd_resync_finished(device); |
b411b363 PR |
1895 | } |
1896 | ||
b30ab791 AG |
1897 | drbd_rs_controller_reset(device); |
1898 | /* ns.conn may already be != device->state.conn, | |
b411b363 PR |
1899 | * we may have been paused in between, or become paused until |
1900 | * the timer triggers. | |
1901 | * No matter, that is handled in resync_timer_fn() */ | |
1902 | if (ns.conn == C_SYNC_TARGET) | |
b30ab791 | 1903 | mod_timer(&device->resync_timer, jiffies); |
b411b363 | 1904 | |
b30ab791 | 1905 | drbd_md_sync(device); |
b411b363 | 1906 | } |
b30ab791 | 1907 | put_ldev(device); |
28bc3b8c | 1908 | out: |
b30ab791 | 1909 | mutex_unlock(device->state_mutex); |
b411b363 PR |
1910 | } |
1911 | ||
e334f550 | 1912 | static void update_on_disk_bitmap(struct drbd_device *device, bool resync_done) |
c7a58db4 LE |
1913 | { |
1914 | struct sib_info sib = { .sib_reason = SIB_SYNC_PROGRESS, }; | |
1915 | device->rs_last_bcast = jiffies; | |
1916 | ||
1917 | if (!get_ldev(device)) | |
1918 | return; | |
1919 | ||
1920 | drbd_bm_write_lazy(device, 0); | |
5ab7d2c0 | 1921 | if (resync_done && is_sync_state(device->state.conn)) |
c7a58db4 | 1922 | drbd_resync_finished(device); |
5ab7d2c0 | 1923 | |
c7a58db4 LE |
1924 | drbd_bcast_event(device, &sib); |
1925 | /* update timestamp, in case it took a while to write out stuff */ | |
1926 | device->rs_last_bcast = jiffies; | |
1927 | put_ldev(device); | |
1928 | } | |
1929 | ||
e334f550 LE |
1930 | static void drbd_ldev_destroy(struct drbd_device *device) |
1931 | { | |
1932 | lc_destroy(device->resync); | |
1933 | device->resync = NULL; | |
1934 | lc_destroy(device->act_log); | |
1935 | device->act_log = NULL; | |
d1b80853 AG |
1936 | |
1937 | __acquire(local); | |
63a7c8ad | 1938 | drbd_backing_dev_free(device, device->ldev); |
d1b80853 AG |
1939 | device->ldev = NULL; |
1940 | __release(local); | |
1941 | ||
e334f550 LE |
1942 | clear_bit(GOING_DISKLESS, &device->flags); |
1943 | wake_up(&device->misc_wait); | |
1944 | } | |
1945 | ||
1946 | static void go_diskless(struct drbd_device *device) | |
1947 | { | |
1948 | D_ASSERT(device, device->state.disk == D_FAILED); | |
1949 | /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will | |
1950 | * inc/dec it frequently. Once we are D_DISKLESS, no one will touch | |
1951 | * the protected members anymore, though, so once put_ldev reaches zero | |
1952 | * again, it will be safe to free them. */ | |
1953 | ||
1954 | /* Try to write changed bitmap pages, read errors may have just | |
1955 | * set some bits outside the area covered by the activity log. | |
1956 | * | |
1957 | * If we have an IO error during the bitmap writeout, | |
1958 | * we will want a full sync next time, just in case. | |
1959 | * (Do we want a specific meta data flag for this?) | |
1960 | * | |
1961 | * If that does not make it to stable storage either, | |
1962 | * we cannot do anything about that anymore. | |
1963 | * | |
1964 | * We still need to check if both bitmap and ldev are present, we may | |
1965 | * end up here after a failed attach, before ldev was even assigned. | |
1966 | */ | |
1967 | if (device->bitmap && device->ldev) { | |
1968 | /* An interrupted resync or similar is allowed to recounts bits | |
1969 | * while we detach. | |
1970 | * Any modifications would not be expected anymore, though. | |
1971 | */ | |
1972 | if (drbd_bitmap_io_from_worker(device, drbd_bm_write, | |
1973 | "detach", BM_LOCKED_TEST_ALLOWED)) { | |
1974 | if (test_bit(WAS_READ_ERROR, &device->flags)) { | |
1975 | drbd_md_set_flag(device, MDF_FULL_SYNC); | |
1976 | drbd_md_sync(device); | |
1977 | } | |
1978 | } | |
1979 | } | |
1980 | ||
1981 | drbd_force_state(device, NS(disk, D_DISKLESS)); | |
1982 | } | |
1983 | ||
ac0acb9e LE |
1984 | static int do_md_sync(struct drbd_device *device) |
1985 | { | |
1986 | drbd_warn(device, "md_sync_timer expired! Worker calls drbd_md_sync().\n"); | |
1987 | drbd_md_sync(device); | |
1988 | return 0; | |
1989 | } | |
1990 | ||
944410e9 LE |
1991 | /* only called from drbd_worker thread, no locking */ |
1992 | void __update_timing_details( | |
1993 | struct drbd_thread_timing_details *tdp, | |
1994 | unsigned int *cb_nr, | |
1995 | void *cb, | |
1996 | const char *fn, const unsigned int line) | |
1997 | { | |
1998 | unsigned int i = *cb_nr % DRBD_THREAD_DETAILS_HIST; | |
1999 | struct drbd_thread_timing_details *td = tdp + i; | |
2000 | ||
2001 | td->start_jif = jiffies; | |
2002 | td->cb_addr = cb; | |
2003 | td->caller_fn = fn; | |
2004 | td->line = line; | |
2005 | td->cb_nr = *cb_nr; | |
2006 | ||
2007 | i = (i+1) % DRBD_THREAD_DETAILS_HIST; | |
2008 | td = tdp + i; | |
2009 | memset(td, 0, sizeof(*td)); | |
2010 | ||
2011 | ++(*cb_nr); | |
2012 | } | |
2013 | ||
e334f550 LE |
2014 | static void do_device_work(struct drbd_device *device, const unsigned long todo) |
2015 | { | |
b47a06d1 | 2016 | if (test_bit(MD_SYNC, &todo)) |
ac0acb9e | 2017 | do_md_sync(device); |
b47a06d1 AG |
2018 | if (test_bit(RS_DONE, &todo) || |
2019 | test_bit(RS_PROGRESS, &todo)) | |
2020 | update_on_disk_bitmap(device, test_bit(RS_DONE, &todo)); | |
2021 | if (test_bit(GO_DISKLESS, &todo)) | |
e334f550 | 2022 | go_diskless(device); |
b47a06d1 | 2023 | if (test_bit(DESTROY_DISK, &todo)) |
e334f550 | 2024 | drbd_ldev_destroy(device); |
b47a06d1 | 2025 | if (test_bit(RS_START, &todo)) |
ac0acb9e | 2026 | do_start_resync(device); |
e334f550 LE |
2027 | } |
2028 | ||
2029 | #define DRBD_DEVICE_WORK_MASK \ | |
2030 | ((1UL << GO_DISKLESS) \ | |
2031 | |(1UL << DESTROY_DISK) \ | |
ac0acb9e LE |
2032 | |(1UL << MD_SYNC) \ |
2033 | |(1UL << RS_START) \ | |
e334f550 LE |
2034 | |(1UL << RS_PROGRESS) \ |
2035 | |(1UL << RS_DONE) \ | |
2036 | ) | |
2037 | ||
2038 | static unsigned long get_work_bits(unsigned long *flags) | |
2039 | { | |
2040 | unsigned long old, new; | |
2041 | do { | |
2042 | old = *flags; | |
2043 | new = old & ~DRBD_DEVICE_WORK_MASK; | |
2044 | } while (cmpxchg(flags, old, new) != old); | |
2045 | return old & DRBD_DEVICE_WORK_MASK; | |
2046 | } | |
2047 | ||
2048 | static void do_unqueued_work(struct drbd_connection *connection) | |
c7a58db4 LE |
2049 | { |
2050 | struct drbd_peer_device *peer_device; | |
2051 | int vnr; | |
2052 | ||
2053 | rcu_read_lock(); | |
2054 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { | |
2055 | struct drbd_device *device = peer_device->device; | |
e334f550 LE |
2056 | unsigned long todo = get_work_bits(&device->flags); |
2057 | if (!todo) | |
c7a58db4 | 2058 | continue; |
5ab7d2c0 | 2059 | |
c7a58db4 LE |
2060 | kref_get(&device->kref); |
2061 | rcu_read_unlock(); | |
e334f550 | 2062 | do_device_work(device, todo); |
c7a58db4 LE |
2063 | kref_put(&device->kref, drbd_destroy_device); |
2064 | rcu_read_lock(); | |
2065 | } | |
2066 | rcu_read_unlock(); | |
2067 | } | |
2068 | ||
a186e478 | 2069 | static bool dequeue_work_batch(struct drbd_work_queue *queue, struct list_head *work_list) |
8c0785a5 LE |
2070 | { |
2071 | spin_lock_irq(&queue->q_lock); | |
15e26f6a | 2072 | list_splice_tail_init(&queue->q, work_list); |
8c0785a5 LE |
2073 | spin_unlock_irq(&queue->q_lock); |
2074 | return !list_empty(work_list); | |
2075 | } | |
2076 | ||
bde89a9e | 2077 | static void wait_for_work(struct drbd_connection *connection, struct list_head *work_list) |
b6dd1a89 LE |
2078 | { |
2079 | DEFINE_WAIT(wait); | |
2080 | struct net_conf *nc; | |
2081 | int uncork, cork; | |
2082 | ||
abde9cc6 | 2083 | dequeue_work_batch(&connection->sender_work, work_list); |
b6dd1a89 LE |
2084 | if (!list_empty(work_list)) |
2085 | return; | |
2086 | ||
2087 | /* Still nothing to do? | |
2088 | * Maybe we still need to close the current epoch, | |
2089 | * even if no new requests are queued yet. | |
2090 | * | |
2091 | * Also, poke TCP, just in case. | |
2092 | * Then wait for new work (or signal). */ | |
2093 | rcu_read_lock(); | |
2094 | nc = rcu_dereference(connection->net_conf); | |
2095 | uncork = nc ? nc->tcp_cork : 0; | |
2096 | rcu_read_unlock(); | |
2097 | if (uncork) { | |
2098 | mutex_lock(&connection->data.mutex); | |
2099 | if (connection->data.socket) | |
db10538a | 2100 | tcp_sock_set_cork(connection->data.socket->sk, false); |
b6dd1a89 LE |
2101 | mutex_unlock(&connection->data.mutex); |
2102 | } | |
2103 | ||
2104 | for (;;) { | |
2105 | int send_barrier; | |
2106 | prepare_to_wait(&connection->sender_work.q_wait, &wait, TASK_INTERRUPTIBLE); | |
0500813f | 2107 | spin_lock_irq(&connection->resource->req_lock); |
b6dd1a89 | 2108 | spin_lock(&connection->sender_work.q_lock); /* FIXME get rid of this one? */ |
bc317a9e | 2109 | if (!list_empty(&connection->sender_work.q)) |
4dd726f0 | 2110 | list_splice_tail_init(&connection->sender_work.q, work_list); |
b6dd1a89 LE |
2111 | spin_unlock(&connection->sender_work.q_lock); /* FIXME get rid of this one? */ |
2112 | if (!list_empty(work_list) || signal_pending(current)) { | |
0500813f | 2113 | spin_unlock_irq(&connection->resource->req_lock); |
b6dd1a89 LE |
2114 | break; |
2115 | } | |
f9c78128 LE |
2116 | |
2117 | /* We found nothing new to do, no to-be-communicated request, | |
2118 | * no other work item. We may still need to close the last | |
2119 | * epoch. Next incoming request epoch will be connection -> | |
2120 | * current transfer log epoch number. If that is different | |
2121 | * from the epoch of the last request we communicated, it is | |
2122 | * safe to send the epoch separating barrier now. | |
2123 | */ | |
2124 | send_barrier = | |
2125 | atomic_read(&connection->current_tle_nr) != | |
2126 | connection->send.current_epoch_nr; | |
0500813f | 2127 | spin_unlock_irq(&connection->resource->req_lock); |
f9c78128 LE |
2128 | |
2129 | if (send_barrier) | |
2130 | maybe_send_barrier(connection, | |
2131 | connection->send.current_epoch_nr + 1); | |
5ab7d2c0 | 2132 | |
e334f550 | 2133 | if (test_bit(DEVICE_WORK_PENDING, &connection->flags)) |
5ab7d2c0 LE |
2134 | break; |
2135 | ||
a80ca1ae LE |
2136 | /* drbd_send() may have called flush_signals() */ |
2137 | if (get_t_state(&connection->worker) != RUNNING) | |
2138 | break; | |
5ab7d2c0 | 2139 | |
b6dd1a89 LE |
2140 | schedule(); |
2141 | /* may be woken up for other things but new work, too, | |
2142 | * e.g. if the current epoch got closed. | |
2143 | * In which case we send the barrier above. */ | |
2144 | } | |
2145 | finish_wait(&connection->sender_work.q_wait, &wait); | |
2146 | ||
2147 | /* someone may have changed the config while we have been waiting above. */ | |
2148 | rcu_read_lock(); | |
2149 | nc = rcu_dereference(connection->net_conf); | |
2150 | cork = nc ? nc->tcp_cork : 0; | |
2151 | rcu_read_unlock(); | |
2152 | mutex_lock(&connection->data.mutex); | |
2153 | if (connection->data.socket) { | |
2154 | if (cork) | |
db10538a | 2155 | tcp_sock_set_cork(connection->data.socket->sk, true); |
b6dd1a89 | 2156 | else if (!uncork) |
db10538a | 2157 | tcp_sock_set_cork(connection->data.socket->sk, false); |
b6dd1a89 LE |
2158 | } |
2159 | mutex_unlock(&connection->data.mutex); | |
2160 | } | |
2161 | ||
b411b363 PR |
2162 | int drbd_worker(struct drbd_thread *thi) |
2163 | { | |
bde89a9e | 2164 | struct drbd_connection *connection = thi->connection; |
6db7e50a | 2165 | struct drbd_work *w = NULL; |
c06ece6b | 2166 | struct drbd_peer_device *peer_device; |
b411b363 | 2167 | LIST_HEAD(work_list); |
8c0785a5 | 2168 | int vnr; |
b411b363 | 2169 | |
e77a0a5c | 2170 | while (get_t_state(thi) == RUNNING) { |
80822284 | 2171 | drbd_thread_current_set_cpu(thi); |
b411b363 | 2172 | |
944410e9 LE |
2173 | if (list_empty(&work_list)) { |
2174 | update_worker_timing_details(connection, wait_for_work); | |
bde89a9e | 2175 | wait_for_work(connection, &work_list); |
944410e9 | 2176 | } |
b411b363 | 2177 | |
944410e9 LE |
2178 | if (test_and_clear_bit(DEVICE_WORK_PENDING, &connection->flags)) { |
2179 | update_worker_timing_details(connection, do_unqueued_work); | |
e334f550 | 2180 | do_unqueued_work(connection); |
944410e9 | 2181 | } |
5ab7d2c0 | 2182 | |
8c0785a5 | 2183 | if (signal_pending(current)) { |
b411b363 | 2184 | flush_signals(current); |
19393e10 | 2185 | if (get_t_state(thi) == RUNNING) { |
1ec861eb | 2186 | drbd_warn(connection, "Worker got an unexpected signal\n"); |
b411b363 | 2187 | continue; |
19393e10 | 2188 | } |
b411b363 PR |
2189 | break; |
2190 | } | |
2191 | ||
e77a0a5c | 2192 | if (get_t_state(thi) != RUNNING) |
b411b363 | 2193 | break; |
b411b363 | 2194 | |
729e8b87 | 2195 | if (!list_empty(&work_list)) { |
6db7e50a AG |
2196 | w = list_first_entry(&work_list, struct drbd_work, list); |
2197 | list_del_init(&w->list); | |
944410e9 | 2198 | update_worker_timing_details(connection, w->cb); |
6db7e50a | 2199 | if (w->cb(w, connection->cstate < C_WF_REPORT_PARAMS) == 0) |
8c0785a5 | 2200 | continue; |
bde89a9e AG |
2201 | if (connection->cstate >= C_WF_REPORT_PARAMS) |
2202 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); | |
b411b363 PR |
2203 | } |
2204 | } | |
b411b363 | 2205 | |
8c0785a5 | 2206 | do { |
944410e9 LE |
2207 | if (test_and_clear_bit(DEVICE_WORK_PENDING, &connection->flags)) { |
2208 | update_worker_timing_details(connection, do_unqueued_work); | |
e334f550 | 2209 | do_unqueued_work(connection); |
944410e9 | 2210 | } |
729e8b87 | 2211 | if (!list_empty(&work_list)) { |
6db7e50a AG |
2212 | w = list_first_entry(&work_list, struct drbd_work, list); |
2213 | list_del_init(&w->list); | |
944410e9 | 2214 | update_worker_timing_details(connection, w->cb); |
6db7e50a | 2215 | w->cb(w, 1); |
729e8b87 LE |
2216 | } else |
2217 | dequeue_work_batch(&connection->sender_work, &work_list); | |
e334f550 | 2218 | } while (!list_empty(&work_list) || test_bit(DEVICE_WORK_PENDING, &connection->flags)); |
b411b363 | 2219 | |
c141ebda | 2220 | rcu_read_lock(); |
c06ece6b AG |
2221 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
2222 | struct drbd_device *device = peer_device->device; | |
0b0ba1ef | 2223 | D_ASSERT(device, device->state.disk == D_DISKLESS && device->state.conn == C_STANDALONE); |
b30ab791 | 2224 | kref_get(&device->kref); |
c141ebda | 2225 | rcu_read_unlock(); |
b30ab791 | 2226 | drbd_device_cleanup(device); |
05a10ec7 | 2227 | kref_put(&device->kref, drbd_destroy_device); |
c141ebda | 2228 | rcu_read_lock(); |
0e29d163 | 2229 | } |
c141ebda | 2230 | rcu_read_unlock(); |
b411b363 PR |
2231 | |
2232 | return 0; | |
2233 | } |