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Commit | Line | Data |
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b411b363 PR |
1 | /* |
2 | drbd_worker.c | |
3 | ||
4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
5 | ||
6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
9 | ||
10 | drbd is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2, or (at your option) | |
13 | any later version. | |
14 | ||
15 | drbd is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with drbd; see the file COPYING. If not, write to | |
22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | ||
84b8c06b | 24 | */ |
b411b363 | 25 | |
b411b363 | 26 | #include <linux/module.h> |
b411b363 PR |
27 | #include <linux/drbd.h> |
28 | #include <linux/sched.h> | |
b411b363 PR |
29 | #include <linux/wait.h> |
30 | #include <linux/mm.h> | |
31 | #include <linux/memcontrol.h> | |
32 | #include <linux/mm_inline.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/random.h> | |
b411b363 PR |
35 | #include <linux/string.h> |
36 | #include <linux/scatterlist.h> | |
37 | ||
38 | #include "drbd_int.h" | |
a3603a6e | 39 | #include "drbd_protocol.h" |
b411b363 | 40 | #include "drbd_req.h" |
b411b363 | 41 | |
d448a2e1 AG |
42 | static int make_ov_request(struct drbd_device *, int); |
43 | static int make_resync_request(struct drbd_device *, int); | |
b411b363 | 44 | |
c5a91619 AG |
45 | /* endio handlers: |
46 | * drbd_md_io_complete (defined here) | |
fcefa62e AG |
47 | * drbd_request_endio (defined here) |
48 | * drbd_peer_request_endio (defined here) | |
c5a91619 AG |
49 | * bm_async_io_complete (defined in drbd_bitmap.c) |
50 | * | |
b411b363 PR |
51 | * For all these callbacks, note the following: |
52 | * The callbacks will be called in irq context by the IDE drivers, | |
53 | * and in Softirqs/Tasklets/BH context by the SCSI drivers. | |
54 | * Try to get the locking right :) | |
55 | * | |
56 | */ | |
57 | ||
58 | ||
59 | /* About the global_state_lock | |
60 | Each state transition on an device holds a read lock. In case we have | |
95f8efd0 | 61 | to evaluate the resync after dependencies, we grab a write lock, because |
b411b363 PR |
62 | we need stable states on all devices for that. */ |
63 | rwlock_t global_state_lock; | |
64 | ||
65 | /* used for synchronous meta data and bitmap IO | |
66 | * submitted by drbd_md_sync_page_io() | |
67 | */ | |
68 | void drbd_md_io_complete(struct bio *bio, int error) | |
69 | { | |
b30ab791 | 70 | struct drbd_device *device; |
b411b363 | 71 | |
e37d2438 LE |
72 | device = bio->bi_private; |
73 | device->md_io.error = error; | |
b411b363 | 74 | |
0cfac5dd PR |
75 | /* We grabbed an extra reference in _drbd_md_sync_page_io() to be able |
76 | * to timeout on the lower level device, and eventually detach from it. | |
77 | * If this io completion runs after that timeout expired, this | |
78 | * drbd_md_put_buffer() may allow us to finally try and re-attach. | |
79 | * During normal operation, this only puts that extra reference | |
80 | * down to 1 again. | |
81 | * Make sure we first drop the reference, and only then signal | |
82 | * completion, or we may (in drbd_al_read_log()) cycle so fast into the | |
83 | * next drbd_md_sync_page_io(), that we trigger the | |
b30ab791 | 84 | * ASSERT(atomic_read(&device->md_io_in_use) == 1) there. |
0cfac5dd | 85 | */ |
b30ab791 | 86 | drbd_md_put_buffer(device); |
e37d2438 | 87 | device->md_io.done = 1; |
b30ab791 | 88 | wake_up(&device->misc_wait); |
cdfda633 | 89 | bio_put(bio); |
b30ab791 AG |
90 | if (device->ldev) /* special case: drbd_md_read() during drbd_adm_attach() */ |
91 | put_ldev(device); | |
b411b363 PR |
92 | } |
93 | ||
94 | /* reads on behalf of the partner, | |
95 | * "submitted" by the receiver | |
96 | */ | |
a186e478 | 97 | static void drbd_endio_read_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
b411b363 PR |
98 | { |
99 | unsigned long flags = 0; | |
6780139c AG |
100 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
101 | struct drbd_device *device = peer_device->device; | |
b411b363 | 102 | |
0500813f | 103 | spin_lock_irqsave(&device->resource->req_lock, flags); |
b30ab791 | 104 | device->read_cnt += peer_req->i.size >> 9; |
a8cd15ba | 105 | list_del(&peer_req->w.list); |
b30ab791 AG |
106 | if (list_empty(&device->read_ee)) |
107 | wake_up(&device->ee_wait); | |
db830c46 | 108 | if (test_bit(__EE_WAS_ERROR, &peer_req->flags)) |
b30ab791 | 109 | __drbd_chk_io_error(device, DRBD_READ_ERROR); |
0500813f | 110 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
b411b363 | 111 | |
6780139c | 112 | drbd_queue_work(&peer_device->connection->sender_work, &peer_req->w); |
b30ab791 | 113 | put_ldev(device); |
b411b363 PR |
114 | } |
115 | ||
116 | /* writes on behalf of the partner, or resync writes, | |
45bb912b | 117 | * "submitted" by the receiver, final stage. */ |
a0fb3c47 | 118 | void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
b411b363 PR |
119 | { |
120 | unsigned long flags = 0; | |
6780139c AG |
121 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
122 | struct drbd_device *device = peer_device->device; | |
181286ad | 123 | struct drbd_interval i; |
b411b363 | 124 | int do_wake; |
579b57ed | 125 | u64 block_id; |
b411b363 | 126 | int do_al_complete_io; |
b411b363 | 127 | |
db830c46 | 128 | /* after we moved peer_req to done_ee, |
b411b363 PR |
129 | * we may no longer access it, |
130 | * it may be freed/reused already! | |
131 | * (as soon as we release the req_lock) */ | |
181286ad | 132 | i = peer_req->i; |
db830c46 AG |
133 | do_al_complete_io = peer_req->flags & EE_CALL_AL_COMPLETE_IO; |
134 | block_id = peer_req->block_id; | |
b411b363 | 135 | |
0500813f | 136 | spin_lock_irqsave(&device->resource->req_lock, flags); |
b30ab791 | 137 | device->writ_cnt += peer_req->i.size >> 9; |
a8cd15ba | 138 | list_move_tail(&peer_req->w.list, &device->done_ee); |
b411b363 | 139 | |
bb3bfe96 | 140 | /* |
5e472264 | 141 | * Do not remove from the write_requests tree here: we did not send the |
bb3bfe96 AG |
142 | * Ack yet and did not wake possibly waiting conflicting requests. |
143 | * Removed from the tree from "drbd_process_done_ee" within the | |
84b8c06b | 144 | * appropriate dw.cb (e_end_block/e_end_resync_block) or from |
bb3bfe96 AG |
145 | * _drbd_clear_done_ee. |
146 | */ | |
b411b363 | 147 | |
b30ab791 | 148 | do_wake = list_empty(block_id == ID_SYNCER ? &device->sync_ee : &device->active_ee); |
b411b363 | 149 | |
a0fb3c47 LE |
150 | /* FIXME do we want to detach for failed REQ_DISCARD? |
151 | * ((peer_req->flags & (EE_WAS_ERROR|EE_IS_TRIM)) == EE_WAS_ERROR) */ | |
152 | if (peer_req->flags & EE_WAS_ERROR) | |
b30ab791 | 153 | __drbd_chk_io_error(device, DRBD_WRITE_ERROR); |
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 | |
6780139c | 165 | wake_asender(peer_device->connection); |
b30ab791 | 166 | put_ldev(device); |
45bb912b | 167 | } |
b411b363 | 168 | |
45bb912b LE |
169 | /* writes on behalf of the partner, or resync writes, |
170 | * "submitted" by the receiver. | |
171 | */ | |
fcefa62e | 172 | void drbd_peer_request_endio(struct bio *bio, int error) |
45bb912b | 173 | { |
db830c46 | 174 | struct drbd_peer_request *peer_req = bio->bi_private; |
a8cd15ba | 175 | struct drbd_device *device = peer_req->peer_device->device; |
45bb912b LE |
176 | int uptodate = bio_flagged(bio, BIO_UPTODATE); |
177 | int is_write = bio_data_dir(bio) == WRITE; | |
a0fb3c47 | 178 | int is_discard = !!(bio->bi_rw & REQ_DISCARD); |
45bb912b | 179 | |
07194272 | 180 | if (error && __ratelimit(&drbd_ratelimit_state)) |
d0180171 | 181 | drbd_warn(device, "%s: error=%d s=%llus\n", |
a0fb3c47 LE |
182 | is_write ? (is_discard ? "discard" : "write") |
183 | : "read", error, | |
db830c46 | 184 | (unsigned long long)peer_req->i.sector); |
45bb912b | 185 | if (!error && !uptodate) { |
07194272 | 186 | if (__ratelimit(&drbd_ratelimit_state)) |
d0180171 | 187 | drbd_warn(device, "%s: setting error to -EIO s=%llus\n", |
07194272 | 188 | is_write ? "write" : "read", |
db830c46 | 189 | (unsigned long long)peer_req->i.sector); |
45bb912b LE |
190 | /* strange behavior of some lower level drivers... |
191 | * fail the request by clearing the uptodate flag, | |
192 | * but do not return any error?! */ | |
193 | error = -EIO; | |
194 | } | |
195 | ||
196 | if (error) | |
db830c46 | 197 | set_bit(__EE_WAS_ERROR, &peer_req->flags); |
45bb912b LE |
198 | |
199 | bio_put(bio); /* no need for the bio anymore */ | |
db830c46 | 200 | if (atomic_dec_and_test(&peer_req->pending_bios)) { |
45bb912b | 201 | if (is_write) |
db830c46 | 202 | drbd_endio_write_sec_final(peer_req); |
45bb912b | 203 | else |
db830c46 | 204 | drbd_endio_read_sec_final(peer_req); |
45bb912b | 205 | } |
b411b363 PR |
206 | } |
207 | ||
208 | /* read, readA or write requests on R_PRIMARY coming from drbd_make_request | |
209 | */ | |
fcefa62e | 210 | void drbd_request_endio(struct bio *bio, int error) |
b411b363 | 211 | { |
a115413d | 212 | unsigned long flags; |
b411b363 | 213 | struct drbd_request *req = bio->bi_private; |
84b8c06b | 214 | struct drbd_device *device = req->device; |
a115413d | 215 | struct bio_and_error m; |
b411b363 PR |
216 | enum drbd_req_event what; |
217 | int uptodate = bio_flagged(bio, BIO_UPTODATE); | |
218 | ||
b411b363 | 219 | if (!error && !uptodate) { |
d0180171 | 220 | drbd_warn(device, "p %s: setting error to -EIO\n", |
b411b363 PR |
221 | bio_data_dir(bio) == WRITE ? "write" : "read"); |
222 | /* strange behavior of some lower level drivers... | |
223 | * fail the request by clearing the uptodate flag, | |
224 | * but do not return any error?! */ | |
225 | error = -EIO; | |
226 | } | |
227 | ||
1b6dd252 PR |
228 | |
229 | /* If this request was aborted locally before, | |
230 | * but now was completed "successfully", | |
231 | * chances are that this caused arbitrary data corruption. | |
232 | * | |
233 | * "aborting" requests, or force-detaching the disk, is intended for | |
234 | * completely blocked/hung local backing devices which do no longer | |
235 | * complete requests at all, not even do error completions. In this | |
236 | * situation, usually a hard-reset and failover is the only way out. | |
237 | * | |
238 | * By "aborting", basically faking a local error-completion, | |
239 | * we allow for a more graceful swichover by cleanly migrating services. | |
240 | * Still the affected node has to be rebooted "soon". | |
241 | * | |
242 | * By completing these requests, we allow the upper layers to re-use | |
243 | * the associated data pages. | |
244 | * | |
245 | * If later the local backing device "recovers", and now DMAs some data | |
246 | * from disk into the original request pages, in the best case it will | |
247 | * just put random data into unused pages; but typically it will corrupt | |
248 | * meanwhile completely unrelated data, causing all sorts of damage. | |
249 | * | |
250 | * Which means delayed successful completion, | |
251 | * especially for READ requests, | |
252 | * is a reason to panic(). | |
253 | * | |
254 | * We assume that a delayed *error* completion is OK, | |
255 | * though we still will complain noisily about it. | |
256 | */ | |
257 | if (unlikely(req->rq_state & RQ_LOCAL_ABORTED)) { | |
258 | if (__ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 259 | drbd_emerg(device, "delayed completion of aborted local request; disk-timeout may be too aggressive\n"); |
1b6dd252 PR |
260 | |
261 | if (!error) | |
262 | panic("possible random memory corruption caused by delayed completion of aborted local request\n"); | |
263 | } | |
264 | ||
b411b363 PR |
265 | /* to avoid recursion in __req_mod */ |
266 | if (unlikely(error)) { | |
2f632aeb LE |
267 | if (bio->bi_rw & REQ_DISCARD) |
268 | what = (error == -EOPNOTSUPP) | |
269 | ? DISCARD_COMPLETED_NOTSUPP | |
270 | : DISCARD_COMPLETED_WITH_ERROR; | |
271 | else | |
272 | what = (bio_data_dir(bio) == WRITE) | |
8554df1c | 273 | ? WRITE_COMPLETED_WITH_ERROR |
5c3c7e64 | 274 | : (bio_rw(bio) == READ) |
8554df1c AG |
275 | ? READ_COMPLETED_WITH_ERROR |
276 | : READ_AHEAD_COMPLETED_WITH_ERROR; | |
b411b363 | 277 | } else |
8554df1c | 278 | what = COMPLETED_OK; |
b411b363 PR |
279 | |
280 | bio_put(req->private_bio); | |
281 | req->private_bio = ERR_PTR(error); | |
282 | ||
a115413d | 283 | /* not req_mod(), we need irqsave here! */ |
0500813f | 284 | spin_lock_irqsave(&device->resource->req_lock, flags); |
a115413d | 285 | __req_mod(req, what, &m); |
0500813f | 286 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
b30ab791 | 287 | put_ldev(device); |
a115413d LE |
288 | |
289 | if (m.bio) | |
b30ab791 | 290 | complete_master_bio(device, &m); |
b411b363 PR |
291 | } |
292 | ||
79a3c8d3 | 293 | void drbd_csum_ee(struct crypto_hash *tfm, struct drbd_peer_request *peer_req, void *digest) |
45bb912b LE |
294 | { |
295 | struct hash_desc desc; | |
296 | struct scatterlist sg; | |
db830c46 | 297 | struct page *page = peer_req->pages; |
45bb912b LE |
298 | struct page *tmp; |
299 | unsigned len; | |
300 | ||
301 | desc.tfm = tfm; | |
302 | desc.flags = 0; | |
303 | ||
304 | sg_init_table(&sg, 1); | |
305 | crypto_hash_init(&desc); | |
306 | ||
307 | while ((tmp = page_chain_next(page))) { | |
308 | /* all but the last page will be fully used */ | |
309 | sg_set_page(&sg, page, PAGE_SIZE, 0); | |
310 | crypto_hash_update(&desc, &sg, sg.length); | |
311 | page = tmp; | |
312 | } | |
313 | /* and now the last, possibly only partially used page */ | |
db830c46 | 314 | len = peer_req->i.size & (PAGE_SIZE - 1); |
45bb912b LE |
315 | sg_set_page(&sg, page, len ?: PAGE_SIZE, 0); |
316 | crypto_hash_update(&desc, &sg, sg.length); | |
317 | crypto_hash_final(&desc, digest); | |
318 | } | |
319 | ||
79a3c8d3 | 320 | void drbd_csum_bio(struct crypto_hash *tfm, struct bio *bio, void *digest) |
b411b363 PR |
321 | { |
322 | struct hash_desc desc; | |
323 | struct scatterlist sg; | |
7988613b KO |
324 | struct bio_vec bvec; |
325 | struct bvec_iter iter; | |
b411b363 PR |
326 | |
327 | desc.tfm = tfm; | |
328 | desc.flags = 0; | |
329 | ||
330 | sg_init_table(&sg, 1); | |
331 | crypto_hash_init(&desc); | |
332 | ||
7988613b KO |
333 | bio_for_each_segment(bvec, bio, iter) { |
334 | sg_set_page(&sg, bvec.bv_page, bvec.bv_len, bvec.bv_offset); | |
b411b363 PR |
335 | crypto_hash_update(&desc, &sg, sg.length); |
336 | } | |
337 | crypto_hash_final(&desc, digest); | |
338 | } | |
339 | ||
9676c760 | 340 | /* MAYBE merge common code with w_e_end_ov_req */ |
99920dc5 | 341 | static int w_e_send_csum(struct drbd_work *w, int cancel) |
b411b363 | 342 | { |
a8cd15ba | 343 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
344 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
345 | struct drbd_device *device = peer_device->device; | |
b411b363 PR |
346 | int digest_size; |
347 | void *digest; | |
99920dc5 | 348 | int err = 0; |
b411b363 | 349 | |
53ea4331 LE |
350 | if (unlikely(cancel)) |
351 | goto out; | |
b411b363 | 352 | |
9676c760 | 353 | if (unlikely((peer_req->flags & EE_WAS_ERROR) != 0)) |
53ea4331 | 354 | goto out; |
b411b363 | 355 | |
6780139c | 356 | digest_size = crypto_hash_digestsize(peer_device->connection->csums_tfm); |
53ea4331 LE |
357 | digest = kmalloc(digest_size, GFP_NOIO); |
358 | if (digest) { | |
db830c46 AG |
359 | sector_t sector = peer_req->i.sector; |
360 | unsigned int size = peer_req->i.size; | |
6780139c | 361 | drbd_csum_ee(peer_device->connection->csums_tfm, peer_req, digest); |
9676c760 | 362 | /* Free peer_req and pages before send. |
53ea4331 LE |
363 | * In case we block on congestion, we could otherwise run into |
364 | * some distributed deadlock, if the other side blocks on | |
365 | * congestion as well, because our receiver blocks in | |
c37c8ecf | 366 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
b30ab791 | 367 | drbd_free_peer_req(device, peer_req); |
db830c46 | 368 | peer_req = NULL; |
b30ab791 | 369 | inc_rs_pending(device); |
6780139c | 370 | err = drbd_send_drequest_csum(peer_device, sector, size, |
db1b0b72 AG |
371 | digest, digest_size, |
372 | P_CSUM_RS_REQUEST); | |
53ea4331 LE |
373 | kfree(digest); |
374 | } else { | |
d0180171 | 375 | drbd_err(device, "kmalloc() of digest failed.\n"); |
99920dc5 | 376 | err = -ENOMEM; |
53ea4331 | 377 | } |
b411b363 | 378 | |
53ea4331 | 379 | out: |
db830c46 | 380 | if (peer_req) |
b30ab791 | 381 | drbd_free_peer_req(device, peer_req); |
b411b363 | 382 | |
99920dc5 | 383 | if (unlikely(err)) |
d0180171 | 384 | drbd_err(device, "drbd_send_drequest(..., csum) failed\n"); |
99920dc5 | 385 | return err; |
b411b363 PR |
386 | } |
387 | ||
388 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
389 | ||
69a22773 | 390 | static int read_for_csum(struct drbd_peer_device *peer_device, sector_t sector, int size) |
b411b363 | 391 | { |
69a22773 | 392 | struct drbd_device *device = peer_device->device; |
db830c46 | 393 | struct drbd_peer_request *peer_req; |
b411b363 | 394 | |
b30ab791 | 395 | if (!get_ldev(device)) |
80a40e43 | 396 | return -EIO; |
b411b363 PR |
397 | |
398 | /* GFP_TRY, because if there is no memory available right now, this may | |
399 | * be rescheduled for later. It is "only" background resync, after all. */ | |
69a22773 | 400 | peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER /* unused */, sector, |
a0fb3c47 | 401 | size, true /* has real payload */, GFP_TRY); |
db830c46 | 402 | if (!peer_req) |
80a40e43 | 403 | goto defer; |
b411b363 | 404 | |
a8cd15ba | 405 | peer_req->w.cb = w_e_send_csum; |
0500813f | 406 | spin_lock_irq(&device->resource->req_lock); |
b9ed7080 | 407 | list_add_tail(&peer_req->w.list, &device->read_ee); |
0500813f | 408 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 409 | |
b30ab791 AG |
410 | atomic_add(size >> 9, &device->rs_sect_ev); |
411 | if (drbd_submit_peer_request(device, peer_req, READ, DRBD_FAULT_RS_RD) == 0) | |
80a40e43 | 412 | return 0; |
b411b363 | 413 | |
10f6d992 LE |
414 | /* If it failed because of ENOMEM, retry should help. If it failed |
415 | * because bio_add_page failed (probably broken lower level driver), | |
416 | * retry may or may not help. | |
417 | * If it does not, you may need to force disconnect. */ | |
0500813f | 418 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 419 | list_del(&peer_req->w.list); |
0500813f | 420 | spin_unlock_irq(&device->resource->req_lock); |
22cc37a9 | 421 | |
b30ab791 | 422 | drbd_free_peer_req(device, peer_req); |
80a40e43 | 423 | defer: |
b30ab791 | 424 | put_ldev(device); |
80a40e43 | 425 | return -EAGAIN; |
b411b363 PR |
426 | } |
427 | ||
99920dc5 | 428 | int w_resync_timer(struct drbd_work *w, int cancel) |
b411b363 | 429 | { |
84b8c06b AG |
430 | struct drbd_device *device = |
431 | container_of(w, struct drbd_device, resync_work); | |
432 | ||
b30ab791 | 433 | switch (device->state.conn) { |
63106d3c | 434 | case C_VERIFY_S: |
d448a2e1 | 435 | make_ov_request(device, cancel); |
63106d3c PR |
436 | break; |
437 | case C_SYNC_TARGET: | |
d448a2e1 | 438 | make_resync_request(device, cancel); |
63106d3c | 439 | break; |
b411b363 PR |
440 | } |
441 | ||
99920dc5 | 442 | return 0; |
794abb75 PR |
443 | } |
444 | ||
445 | void resync_timer_fn(unsigned long data) | |
446 | { | |
b30ab791 | 447 | struct drbd_device *device = (struct drbd_device *) data; |
794abb75 | 448 | |
15e26f6a LE |
449 | drbd_queue_work_if_unqueued( |
450 | &first_peer_device(device)->connection->sender_work, | |
451 | &device->resync_work); | |
b411b363 PR |
452 | } |
453 | ||
778f271d PR |
454 | static void fifo_set(struct fifo_buffer *fb, int value) |
455 | { | |
456 | int i; | |
457 | ||
458 | for (i = 0; i < fb->size; i++) | |
f10f2623 | 459 | fb->values[i] = value; |
778f271d PR |
460 | } |
461 | ||
462 | static int fifo_push(struct fifo_buffer *fb, int value) | |
463 | { | |
464 | int ov; | |
465 | ||
466 | ov = fb->values[fb->head_index]; | |
467 | fb->values[fb->head_index++] = value; | |
468 | ||
469 | if (fb->head_index >= fb->size) | |
470 | fb->head_index = 0; | |
471 | ||
472 | return ov; | |
473 | } | |
474 | ||
475 | static void fifo_add_val(struct fifo_buffer *fb, int value) | |
476 | { | |
477 | int i; | |
478 | ||
479 | for (i = 0; i < fb->size; i++) | |
480 | fb->values[i] += value; | |
481 | } | |
482 | ||
9958c857 PR |
483 | struct fifo_buffer *fifo_alloc(int fifo_size) |
484 | { | |
485 | struct fifo_buffer *fb; | |
486 | ||
8747d30a | 487 | fb = kzalloc(sizeof(struct fifo_buffer) + sizeof(int) * fifo_size, GFP_NOIO); |
9958c857 PR |
488 | if (!fb) |
489 | return NULL; | |
490 | ||
491 | fb->head_index = 0; | |
492 | fb->size = fifo_size; | |
493 | fb->total = 0; | |
494 | ||
495 | return fb; | |
496 | } | |
497 | ||
0e49d7b0 | 498 | static int drbd_rs_controller(struct drbd_device *device, unsigned int sect_in) |
778f271d | 499 | { |
daeda1cc | 500 | struct disk_conf *dc; |
7f34f614 | 501 | unsigned int want; /* The number of sectors we want in-flight */ |
778f271d | 502 | int req_sect; /* Number of sectors to request in this turn */ |
7f34f614 | 503 | int correction; /* Number of sectors more we need in-flight */ |
778f271d PR |
504 | int cps; /* correction per invocation of drbd_rs_controller() */ |
505 | int steps; /* Number of time steps to plan ahead */ | |
506 | int curr_corr; | |
507 | int max_sect; | |
813472ce | 508 | struct fifo_buffer *plan; |
778f271d | 509 | |
b30ab791 AG |
510 | dc = rcu_dereference(device->ldev->disk_conf); |
511 | plan = rcu_dereference(device->rs_plan_s); | |
778f271d | 512 | |
813472ce | 513 | steps = plan->size; /* (dc->c_plan_ahead * 10 * SLEEP_TIME) / HZ; */ |
778f271d | 514 | |
b30ab791 | 515 | if (device->rs_in_flight + sect_in == 0) { /* At start of resync */ |
daeda1cc | 516 | want = ((dc->resync_rate * 2 * SLEEP_TIME) / HZ) * steps; |
778f271d | 517 | } else { /* normal path */ |
daeda1cc PR |
518 | want = dc->c_fill_target ? dc->c_fill_target : |
519 | sect_in * dc->c_delay_target * HZ / (SLEEP_TIME * 10); | |
778f271d PR |
520 | } |
521 | ||
b30ab791 | 522 | correction = want - device->rs_in_flight - plan->total; |
778f271d PR |
523 | |
524 | /* Plan ahead */ | |
525 | cps = correction / steps; | |
813472ce PR |
526 | fifo_add_val(plan, cps); |
527 | plan->total += cps * steps; | |
778f271d PR |
528 | |
529 | /* What we do in this step */ | |
813472ce PR |
530 | curr_corr = fifo_push(plan, 0); |
531 | plan->total -= curr_corr; | |
778f271d PR |
532 | |
533 | req_sect = sect_in + curr_corr; | |
534 | if (req_sect < 0) | |
535 | req_sect = 0; | |
536 | ||
daeda1cc | 537 | max_sect = (dc->c_max_rate * 2 * SLEEP_TIME) / HZ; |
778f271d PR |
538 | if (req_sect > max_sect) |
539 | req_sect = max_sect; | |
540 | ||
541 | /* | |
d0180171 | 542 | drbd_warn(device, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n", |
b30ab791 AG |
543 | sect_in, device->rs_in_flight, want, correction, |
544 | steps, cps, device->rs_planed, curr_corr, req_sect); | |
778f271d PR |
545 | */ |
546 | ||
547 | return req_sect; | |
548 | } | |
549 | ||
b30ab791 | 550 | static int drbd_rs_number_requests(struct drbd_device *device) |
e65f440d | 551 | { |
0e49d7b0 LE |
552 | unsigned int sect_in; /* Number of sectors that came in since the last turn */ |
553 | int number, mxb; | |
554 | ||
555 | sect_in = atomic_xchg(&device->rs_sect_in, 0); | |
556 | device->rs_in_flight -= sect_in; | |
813472ce PR |
557 | |
558 | rcu_read_lock(); | |
0e49d7b0 | 559 | mxb = drbd_get_max_buffers(device) / 2; |
b30ab791 | 560 | if (rcu_dereference(device->rs_plan_s)->size) { |
0e49d7b0 | 561 | number = drbd_rs_controller(device, sect_in) >> (BM_BLOCK_SHIFT - 9); |
b30ab791 | 562 | device->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME; |
e65f440d | 563 | } else { |
b30ab791 AG |
564 | device->c_sync_rate = rcu_dereference(device->ldev->disk_conf)->resync_rate; |
565 | number = SLEEP_TIME * device->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ); | |
e65f440d | 566 | } |
813472ce | 567 | rcu_read_unlock(); |
e65f440d | 568 | |
0e49d7b0 LE |
569 | /* Don't have more than "max-buffers"/2 in-flight. |
570 | * Otherwise we may cause the remote site to stall on drbd_alloc_pages(), | |
571 | * potentially causing a distributed deadlock on congestion during | |
572 | * online-verify or (checksum-based) resync, if max-buffers, | |
573 | * socket buffer sizes and resync rate settings are mis-configured. */ | |
7f34f614 LE |
574 | |
575 | /* note that "number" is in units of "BM_BLOCK_SIZE" (which is 4k), | |
576 | * mxb (as used here, and in drbd_alloc_pages on the peer) is | |
577 | * "number of pages" (typically also 4k), | |
578 | * but "rs_in_flight" is in "sectors" (512 Byte). */ | |
579 | if (mxb - device->rs_in_flight/8 < number) | |
580 | number = mxb - device->rs_in_flight/8; | |
0e49d7b0 | 581 | |
e65f440d LE |
582 | return number; |
583 | } | |
584 | ||
44a4d551 | 585 | static int make_resync_request(struct drbd_device *const device, int cancel) |
b411b363 | 586 | { |
44a4d551 LE |
587 | struct drbd_peer_device *const peer_device = first_peer_device(device); |
588 | struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL; | |
b411b363 PR |
589 | unsigned long bit; |
590 | sector_t sector; | |
b30ab791 | 591 | const sector_t capacity = drbd_get_capacity(device->this_bdev); |
1816a2b4 | 592 | int max_bio_size; |
e65f440d | 593 | int number, rollback_i, size; |
506afb62 | 594 | int align, requeue = 0; |
0f0601f4 | 595 | int i = 0; |
b411b363 PR |
596 | |
597 | if (unlikely(cancel)) | |
99920dc5 | 598 | return 0; |
b411b363 | 599 | |
b30ab791 | 600 | if (device->rs_total == 0) { |
af85e8e8 | 601 | /* empty resync? */ |
b30ab791 | 602 | drbd_resync_finished(device); |
99920dc5 | 603 | return 0; |
af85e8e8 LE |
604 | } |
605 | ||
b30ab791 AG |
606 | if (!get_ldev(device)) { |
607 | /* Since we only need to access device->rsync a | |
608 | get_ldev_if_state(device,D_FAILED) would be sufficient, but | |
b411b363 PR |
609 | to continue resync with a broken disk makes no sense at |
610 | all */ | |
d0180171 | 611 | drbd_err(device, "Disk broke down during resync!\n"); |
99920dc5 | 612 | return 0; |
b411b363 PR |
613 | } |
614 | ||
b30ab791 AG |
615 | max_bio_size = queue_max_hw_sectors(device->rq_queue) << 9; |
616 | number = drbd_rs_number_requests(device); | |
0e49d7b0 | 617 | if (number <= 0) |
0f0601f4 | 618 | goto requeue; |
b411b363 | 619 | |
b411b363 | 620 | for (i = 0; i < number; i++) { |
506afb62 LE |
621 | /* Stop generating RS requests when half of the send buffer is filled, |
622 | * but notify TCP that we'd like to have more space. */ | |
44a4d551 LE |
623 | mutex_lock(&connection->data.mutex); |
624 | if (connection->data.socket) { | |
506afb62 LE |
625 | struct sock *sk = connection->data.socket->sk; |
626 | int queued = sk->sk_wmem_queued; | |
627 | int sndbuf = sk->sk_sndbuf; | |
628 | if (queued > sndbuf / 2) { | |
629 | requeue = 1; | |
630 | if (sk->sk_socket) | |
631 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
632 | } | |
633 | } else | |
634 | requeue = 1; | |
44a4d551 | 635 | mutex_unlock(&connection->data.mutex); |
506afb62 | 636 | if (requeue) |
b411b363 PR |
637 | goto requeue; |
638 | ||
639 | next_sector: | |
640 | size = BM_BLOCK_SIZE; | |
b30ab791 | 641 | bit = drbd_bm_find_next(device, device->bm_resync_fo); |
b411b363 | 642 | |
4b0715f0 | 643 | if (bit == DRBD_END_OF_BITMAP) { |
b30ab791 AG |
644 | device->bm_resync_fo = drbd_bm_bits(device); |
645 | put_ldev(device); | |
99920dc5 | 646 | return 0; |
b411b363 PR |
647 | } |
648 | ||
649 | sector = BM_BIT_TO_SECT(bit); | |
650 | ||
ad3fee79 | 651 | if (drbd_try_rs_begin_io(device, sector)) { |
b30ab791 | 652 | device->bm_resync_fo = bit; |
b411b363 PR |
653 | goto requeue; |
654 | } | |
b30ab791 | 655 | device->bm_resync_fo = bit + 1; |
b411b363 | 656 | |
b30ab791 AG |
657 | if (unlikely(drbd_bm_test_bit(device, bit) == 0)) { |
658 | drbd_rs_complete_io(device, sector); | |
b411b363 PR |
659 | goto next_sector; |
660 | } | |
661 | ||
1816a2b4 | 662 | #if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE |
b411b363 PR |
663 | /* try to find some adjacent bits. |
664 | * we stop if we have already the maximum req size. | |
665 | * | |
666 | * Additionally always align bigger requests, in order to | |
667 | * be prepared for all stripe sizes of software RAIDs. | |
b411b363 PR |
668 | */ |
669 | align = 1; | |
d207450c | 670 | rollback_i = i; |
6377b923 | 671 | while (i < number) { |
1816a2b4 | 672 | if (size + BM_BLOCK_SIZE > max_bio_size) |
b411b363 PR |
673 | break; |
674 | ||
675 | /* Be always aligned */ | |
676 | if (sector & ((1<<(align+3))-1)) | |
677 | break; | |
678 | ||
679 | /* do not cross extent boundaries */ | |
680 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) | |
681 | break; | |
682 | /* now, is it actually dirty, after all? | |
683 | * caution, drbd_bm_test_bit is tri-state for some | |
684 | * obscure reason; ( b == 0 ) would get the out-of-band | |
685 | * only accidentally right because of the "oddly sized" | |
686 | * adjustment below */ | |
b30ab791 | 687 | if (drbd_bm_test_bit(device, bit+1) != 1) |
b411b363 PR |
688 | break; |
689 | bit++; | |
690 | size += BM_BLOCK_SIZE; | |
691 | if ((BM_BLOCK_SIZE << align) <= size) | |
692 | align++; | |
693 | i++; | |
694 | } | |
695 | /* if we merged some, | |
696 | * reset the offset to start the next drbd_bm_find_next from */ | |
697 | if (size > BM_BLOCK_SIZE) | |
b30ab791 | 698 | device->bm_resync_fo = bit + 1; |
b411b363 PR |
699 | #endif |
700 | ||
701 | /* adjust very last sectors, in case we are oddly sized */ | |
702 | if (sector + (size>>9) > capacity) | |
703 | size = (capacity-sector)<<9; | |
aaaba345 LE |
704 | |
705 | if (device->use_csums) { | |
44a4d551 | 706 | switch (read_for_csum(peer_device, sector, size)) { |
80a40e43 | 707 | case -EIO: /* Disk failure */ |
b30ab791 | 708 | put_ldev(device); |
99920dc5 | 709 | return -EIO; |
80a40e43 | 710 | case -EAGAIN: /* allocation failed, or ldev busy */ |
b30ab791 AG |
711 | drbd_rs_complete_io(device, sector); |
712 | device->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
d207450c | 713 | i = rollback_i; |
b411b363 | 714 | goto requeue; |
80a40e43 LE |
715 | case 0: |
716 | /* everything ok */ | |
717 | break; | |
718 | default: | |
719 | BUG(); | |
b411b363 PR |
720 | } |
721 | } else { | |
99920dc5 AG |
722 | int err; |
723 | ||
b30ab791 | 724 | inc_rs_pending(device); |
44a4d551 | 725 | err = drbd_send_drequest(peer_device, P_RS_DATA_REQUEST, |
99920dc5 AG |
726 | sector, size, ID_SYNCER); |
727 | if (err) { | |
d0180171 | 728 | drbd_err(device, "drbd_send_drequest() failed, aborting...\n"); |
b30ab791 AG |
729 | dec_rs_pending(device); |
730 | put_ldev(device); | |
99920dc5 | 731 | return err; |
b411b363 PR |
732 | } |
733 | } | |
734 | } | |
735 | ||
b30ab791 | 736 | if (device->bm_resync_fo >= drbd_bm_bits(device)) { |
b411b363 PR |
737 | /* last syncer _request_ was sent, |
738 | * but the P_RS_DATA_REPLY not yet received. sync will end (and | |
739 | * next sync group will resume), as soon as we receive the last | |
740 | * resync data block, and the last bit is cleared. | |
741 | * until then resync "work" is "inactive" ... | |
742 | */ | |
b30ab791 | 743 | put_ldev(device); |
99920dc5 | 744 | return 0; |
b411b363 PR |
745 | } |
746 | ||
747 | requeue: | |
b30ab791 AG |
748 | device->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
749 | mod_timer(&device->resync_timer, jiffies + SLEEP_TIME); | |
750 | put_ldev(device); | |
99920dc5 | 751 | return 0; |
b411b363 PR |
752 | } |
753 | ||
d448a2e1 | 754 | static int make_ov_request(struct drbd_device *device, int cancel) |
b411b363 PR |
755 | { |
756 | int number, i, size; | |
757 | sector_t sector; | |
b30ab791 | 758 | const sector_t capacity = drbd_get_capacity(device->this_bdev); |
58ffa580 | 759 | bool stop_sector_reached = false; |
b411b363 PR |
760 | |
761 | if (unlikely(cancel)) | |
762 | return 1; | |
763 | ||
b30ab791 | 764 | number = drbd_rs_number_requests(device); |
b411b363 | 765 | |
b30ab791 | 766 | sector = device->ov_position; |
b411b363 | 767 | for (i = 0; i < number; i++) { |
58ffa580 | 768 | if (sector >= capacity) |
b411b363 | 769 | return 1; |
58ffa580 LE |
770 | |
771 | /* We check for "finished" only in the reply path: | |
772 | * w_e_end_ov_reply(). | |
773 | * We need to send at least one request out. */ | |
774 | stop_sector_reached = i > 0 | |
b30ab791 AG |
775 | && verify_can_do_stop_sector(device) |
776 | && sector >= device->ov_stop_sector; | |
58ffa580 LE |
777 | if (stop_sector_reached) |
778 | break; | |
b411b363 PR |
779 | |
780 | size = BM_BLOCK_SIZE; | |
781 | ||
ad3fee79 | 782 | if (drbd_try_rs_begin_io(device, sector)) { |
b30ab791 | 783 | device->ov_position = sector; |
b411b363 PR |
784 | goto requeue; |
785 | } | |
786 | ||
787 | if (sector + (size>>9) > capacity) | |
788 | size = (capacity-sector)<<9; | |
789 | ||
b30ab791 | 790 | inc_rs_pending(device); |
69a22773 | 791 | if (drbd_send_ov_request(first_peer_device(device), sector, size)) { |
b30ab791 | 792 | dec_rs_pending(device); |
b411b363 PR |
793 | return 0; |
794 | } | |
795 | sector += BM_SECT_PER_BIT; | |
796 | } | |
b30ab791 | 797 | device->ov_position = sector; |
b411b363 PR |
798 | |
799 | requeue: | |
b30ab791 | 800 | device->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
58ffa580 | 801 | if (i == 0 || !stop_sector_reached) |
b30ab791 | 802 | mod_timer(&device->resync_timer, jiffies + SLEEP_TIME); |
b411b363 PR |
803 | return 1; |
804 | } | |
805 | ||
99920dc5 | 806 | int w_ov_finished(struct drbd_work *w, int cancel) |
b411b363 | 807 | { |
84b8c06b AG |
808 | struct drbd_device_work *dw = |
809 | container_of(w, struct drbd_device_work, w); | |
810 | struct drbd_device *device = dw->device; | |
811 | kfree(dw); | |
b30ab791 AG |
812 | ov_out_of_sync_print(device); |
813 | drbd_resync_finished(device); | |
b411b363 | 814 | |
99920dc5 | 815 | return 0; |
b411b363 PR |
816 | } |
817 | ||
99920dc5 | 818 | static int w_resync_finished(struct drbd_work *w, int cancel) |
b411b363 | 819 | { |
84b8c06b AG |
820 | struct drbd_device_work *dw = |
821 | container_of(w, struct drbd_device_work, w); | |
822 | struct drbd_device *device = dw->device; | |
823 | kfree(dw); | |
b411b363 | 824 | |
b30ab791 | 825 | drbd_resync_finished(device); |
b411b363 | 826 | |
99920dc5 | 827 | return 0; |
b411b363 PR |
828 | } |
829 | ||
b30ab791 | 830 | static void ping_peer(struct drbd_device *device) |
af85e8e8 | 831 | { |
a6b32bc3 | 832 | struct drbd_connection *connection = first_peer_device(device)->connection; |
2a67d8b9 | 833 | |
bde89a9e AG |
834 | clear_bit(GOT_PING_ACK, &connection->flags); |
835 | request_ping(connection); | |
836 | wait_event(connection->ping_wait, | |
837 | test_bit(GOT_PING_ACK, &connection->flags) || device->state.conn < C_CONNECTED); | |
af85e8e8 LE |
838 | } |
839 | ||
b30ab791 | 840 | int drbd_resync_finished(struct drbd_device *device) |
b411b363 PR |
841 | { |
842 | unsigned long db, dt, dbdt; | |
843 | unsigned long n_oos; | |
844 | union drbd_state os, ns; | |
84b8c06b | 845 | struct drbd_device_work *dw; |
b411b363 | 846 | char *khelper_cmd = NULL; |
26525618 | 847 | int verify_done = 0; |
b411b363 PR |
848 | |
849 | /* Remove all elements from the resync LRU. Since future actions | |
850 | * might set bits in the (main) bitmap, then the entries in the | |
851 | * resync LRU would be wrong. */ | |
b30ab791 | 852 | if (drbd_rs_del_all(device)) { |
b411b363 PR |
853 | /* In case this is not possible now, most probably because |
854 | * there are P_RS_DATA_REPLY Packets lingering on the worker's | |
855 | * queue (or even the read operations for those packets | |
856 | * is not finished by now). Retry in 100ms. */ | |
857 | ||
20ee6390 | 858 | schedule_timeout_interruptible(HZ / 10); |
84b8c06b AG |
859 | dw = kmalloc(sizeof(struct drbd_device_work), GFP_ATOMIC); |
860 | if (dw) { | |
861 | dw->w.cb = w_resync_finished; | |
862 | dw->device = device; | |
863 | drbd_queue_work(&first_peer_device(device)->connection->sender_work, | |
864 | &dw->w); | |
b411b363 PR |
865 | return 1; |
866 | } | |
84b8c06b | 867 | drbd_err(device, "Warn failed to drbd_rs_del_all() and to kmalloc(dw).\n"); |
b411b363 PR |
868 | } |
869 | ||
b30ab791 | 870 | dt = (jiffies - device->rs_start - device->rs_paused) / HZ; |
b411b363 PR |
871 | if (dt <= 0) |
872 | dt = 1; | |
84b8c06b | 873 | |
b30ab791 | 874 | db = device->rs_total; |
58ffa580 | 875 | /* adjust for verify start and stop sectors, respective reached position */ |
b30ab791 AG |
876 | if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) |
877 | db -= device->ov_left; | |
58ffa580 | 878 | |
b411b363 | 879 | dbdt = Bit2KB(db/dt); |
b30ab791 | 880 | device->rs_paused /= HZ; |
b411b363 | 881 | |
b30ab791 | 882 | if (!get_ldev(device)) |
b411b363 PR |
883 | goto out; |
884 | ||
b30ab791 | 885 | ping_peer(device); |
af85e8e8 | 886 | |
0500813f | 887 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 888 | os = drbd_read_state(device); |
b411b363 | 889 | |
26525618 LE |
890 | verify_done = (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T); |
891 | ||
b411b363 PR |
892 | /* This protects us against multiple calls (that can happen in the presence |
893 | of application IO), and against connectivity loss just before we arrive here. */ | |
894 | if (os.conn <= C_CONNECTED) | |
895 | goto out_unlock; | |
896 | ||
897 | ns = os; | |
898 | ns.conn = C_CONNECTED; | |
899 | ||
d0180171 | 900 | drbd_info(device, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", |
58ffa580 | 901 | verify_done ? "Online verify" : "Resync", |
b30ab791 | 902 | dt + device->rs_paused, device->rs_paused, dbdt); |
b411b363 | 903 | |
b30ab791 | 904 | n_oos = drbd_bm_total_weight(device); |
b411b363 PR |
905 | |
906 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { | |
907 | if (n_oos) { | |
d0180171 | 908 | drbd_alert(device, "Online verify found %lu %dk block out of sync!\n", |
b411b363 PR |
909 | n_oos, Bit2KB(1)); |
910 | khelper_cmd = "out-of-sync"; | |
911 | } | |
912 | } else { | |
0b0ba1ef | 913 | D_ASSERT(device, (n_oos - device->rs_failed) == 0); |
b411b363 PR |
914 | |
915 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) | |
916 | khelper_cmd = "after-resync-target"; | |
917 | ||
aaaba345 | 918 | if (device->use_csums && device->rs_total) { |
b30ab791 AG |
919 | const unsigned long s = device->rs_same_csum; |
920 | const unsigned long t = device->rs_total; | |
b411b363 PR |
921 | const int ratio = |
922 | (t == 0) ? 0 : | |
923 | (t < 100000) ? ((s*100)/t) : (s/(t/100)); | |
d0180171 | 924 | drbd_info(device, "%u %% had equal checksums, eliminated: %luK; " |
b411b363 PR |
925 | "transferred %luK total %luK\n", |
926 | ratio, | |
b30ab791 AG |
927 | Bit2KB(device->rs_same_csum), |
928 | Bit2KB(device->rs_total - device->rs_same_csum), | |
929 | Bit2KB(device->rs_total)); | |
b411b363 PR |
930 | } |
931 | } | |
932 | ||
b30ab791 | 933 | if (device->rs_failed) { |
d0180171 | 934 | drbd_info(device, " %lu failed blocks\n", device->rs_failed); |
b411b363 PR |
935 | |
936 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
937 | ns.disk = D_INCONSISTENT; | |
938 | ns.pdsk = D_UP_TO_DATE; | |
939 | } else { | |
940 | ns.disk = D_UP_TO_DATE; | |
941 | ns.pdsk = D_INCONSISTENT; | |
942 | } | |
943 | } else { | |
944 | ns.disk = D_UP_TO_DATE; | |
945 | ns.pdsk = D_UP_TO_DATE; | |
946 | ||
947 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
b30ab791 | 948 | if (device->p_uuid) { |
b411b363 PR |
949 | int i; |
950 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) | |
b30ab791 AG |
951 | _drbd_uuid_set(device, i, device->p_uuid[i]); |
952 | drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_CURRENT]); | |
953 | _drbd_uuid_set(device, UI_CURRENT, device->p_uuid[UI_CURRENT]); | |
b411b363 | 954 | } else { |
d0180171 | 955 | drbd_err(device, "device->p_uuid is NULL! BUG\n"); |
b411b363 PR |
956 | } |
957 | } | |
958 | ||
62b0da3a LE |
959 | if (!(os.conn == C_VERIFY_S || os.conn == C_VERIFY_T)) { |
960 | /* for verify runs, we don't update uuids here, | |
961 | * so there would be nothing to report. */ | |
b30ab791 AG |
962 | drbd_uuid_set_bm(device, 0UL); |
963 | drbd_print_uuids(device, "updated UUIDs"); | |
964 | if (device->p_uuid) { | |
62b0da3a LE |
965 | /* Now the two UUID sets are equal, update what we |
966 | * know of the peer. */ | |
967 | int i; | |
968 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) | |
b30ab791 | 969 | device->p_uuid[i] = device->ldev->md.uuid[i]; |
62b0da3a | 970 | } |
b411b363 PR |
971 | } |
972 | } | |
973 | ||
b30ab791 | 974 | _drbd_set_state(device, ns, CS_VERBOSE, NULL); |
b411b363 | 975 | out_unlock: |
0500813f | 976 | spin_unlock_irq(&device->resource->req_lock); |
b30ab791 | 977 | put_ldev(device); |
b411b363 | 978 | out: |
b30ab791 AG |
979 | device->rs_total = 0; |
980 | device->rs_failed = 0; | |
981 | device->rs_paused = 0; | |
58ffa580 LE |
982 | |
983 | /* reset start sector, if we reached end of device */ | |
b30ab791 AG |
984 | if (verify_done && device->ov_left == 0) |
985 | device->ov_start_sector = 0; | |
b411b363 | 986 | |
b30ab791 | 987 | drbd_md_sync(device); |
13d42685 | 988 | |
b411b363 | 989 | if (khelper_cmd) |
b30ab791 | 990 | drbd_khelper(device, khelper_cmd); |
b411b363 PR |
991 | |
992 | return 1; | |
993 | } | |
994 | ||
995 | /* helper */ | |
b30ab791 | 996 | static void move_to_net_ee_or_free(struct drbd_device *device, struct drbd_peer_request *peer_req) |
b411b363 | 997 | { |
045417f7 | 998 | if (drbd_peer_req_has_active_page(peer_req)) { |
b411b363 | 999 | /* This might happen if sendpage() has not finished */ |
db830c46 | 1000 | int i = (peer_req->i.size + PAGE_SIZE -1) >> PAGE_SHIFT; |
b30ab791 AG |
1001 | atomic_add(i, &device->pp_in_use_by_net); |
1002 | atomic_sub(i, &device->pp_in_use); | |
0500813f | 1003 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 1004 | list_add_tail(&peer_req->w.list, &device->net_ee); |
0500813f | 1005 | spin_unlock_irq(&device->resource->req_lock); |
435f0740 | 1006 | wake_up(&drbd_pp_wait); |
b411b363 | 1007 | } else |
b30ab791 | 1008 | drbd_free_peer_req(device, peer_req); |
b411b363 PR |
1009 | } |
1010 | ||
1011 | /** | |
1012 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST | |
b30ab791 | 1013 | * @device: DRBD device. |
b411b363 PR |
1014 | * @w: work object. |
1015 | * @cancel: The connection will be closed anyways | |
1016 | */ | |
99920dc5 | 1017 | int w_e_end_data_req(struct drbd_work *w, int cancel) |
b411b363 | 1018 | { |
a8cd15ba | 1019 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
1020 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
1021 | struct drbd_device *device = peer_device->device; | |
99920dc5 | 1022 | int err; |
b411b363 PR |
1023 | |
1024 | if (unlikely(cancel)) { | |
b30ab791 AG |
1025 | drbd_free_peer_req(device, peer_req); |
1026 | dec_unacked(device); | |
99920dc5 | 1027 | return 0; |
b411b363 PR |
1028 | } |
1029 | ||
db830c46 | 1030 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
6780139c | 1031 | err = drbd_send_block(peer_device, P_DATA_REPLY, peer_req); |
b411b363 PR |
1032 | } else { |
1033 | if (__ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 1034 | drbd_err(device, "Sending NegDReply. sector=%llus.\n", |
db830c46 | 1035 | (unsigned long long)peer_req->i.sector); |
b411b363 | 1036 | |
6780139c | 1037 | err = drbd_send_ack(peer_device, P_NEG_DREPLY, peer_req); |
b411b363 PR |
1038 | } |
1039 | ||
b30ab791 | 1040 | dec_unacked(device); |
b411b363 | 1041 | |
b30ab791 | 1042 | move_to_net_ee_or_free(device, peer_req); |
b411b363 | 1043 | |
99920dc5 | 1044 | if (unlikely(err)) |
d0180171 | 1045 | drbd_err(device, "drbd_send_block() failed\n"); |
99920dc5 | 1046 | return err; |
b411b363 PR |
1047 | } |
1048 | ||
1049 | /** | |
a209b4ae | 1050 | * 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 |
1051 | * @w: work object. |
1052 | * @cancel: The connection will be closed anyways | |
1053 | */ | |
99920dc5 | 1054 | int w_e_end_rsdata_req(struct drbd_work *w, int cancel) |
b411b363 | 1055 | { |
a8cd15ba | 1056 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
1057 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
1058 | struct drbd_device *device = peer_device->device; | |
99920dc5 | 1059 | int err; |
b411b363 PR |
1060 | |
1061 | if (unlikely(cancel)) { | |
b30ab791 AG |
1062 | drbd_free_peer_req(device, peer_req); |
1063 | dec_unacked(device); | |
99920dc5 | 1064 | return 0; |
b411b363 PR |
1065 | } |
1066 | ||
b30ab791 AG |
1067 | if (get_ldev_if_state(device, D_FAILED)) { |
1068 | drbd_rs_complete_io(device, peer_req->i.sector); | |
1069 | put_ldev(device); | |
b411b363 PR |
1070 | } |
1071 | ||
b30ab791 | 1072 | if (device->state.conn == C_AHEAD) { |
6780139c | 1073 | err = drbd_send_ack(peer_device, P_RS_CANCEL, peer_req); |
db830c46 | 1074 | } else if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b30ab791 AG |
1075 | if (likely(device->state.pdsk >= D_INCONSISTENT)) { |
1076 | inc_rs_pending(device); | |
6780139c | 1077 | err = drbd_send_block(peer_device, P_RS_DATA_REPLY, peer_req); |
b411b363 PR |
1078 | } else { |
1079 | if (__ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 1080 | drbd_err(device, "Not sending RSDataReply, " |
b411b363 | 1081 | "partner DISKLESS!\n"); |
99920dc5 | 1082 | err = 0; |
b411b363 PR |
1083 | } |
1084 | } else { | |
1085 | if (__ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 1086 | drbd_err(device, "Sending NegRSDReply. sector %llus.\n", |
db830c46 | 1087 | (unsigned long long)peer_req->i.sector); |
b411b363 | 1088 | |
6780139c | 1089 | err = drbd_send_ack(peer_device, P_NEG_RS_DREPLY, peer_req); |
b411b363 PR |
1090 | |
1091 | /* update resync data with failure */ | |
b30ab791 | 1092 | drbd_rs_failed_io(device, peer_req->i.sector, peer_req->i.size); |
b411b363 PR |
1093 | } |
1094 | ||
b30ab791 | 1095 | dec_unacked(device); |
b411b363 | 1096 | |
b30ab791 | 1097 | move_to_net_ee_or_free(device, peer_req); |
b411b363 | 1098 | |
99920dc5 | 1099 | if (unlikely(err)) |
d0180171 | 1100 | drbd_err(device, "drbd_send_block() failed\n"); |
99920dc5 | 1101 | return err; |
b411b363 PR |
1102 | } |
1103 | ||
99920dc5 | 1104 | int w_e_end_csum_rs_req(struct drbd_work *w, int cancel) |
b411b363 | 1105 | { |
a8cd15ba | 1106 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
1107 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
1108 | struct drbd_device *device = peer_device->device; | |
b411b363 PR |
1109 | struct digest_info *di; |
1110 | int digest_size; | |
1111 | void *digest = NULL; | |
99920dc5 | 1112 | int err, eq = 0; |
b411b363 PR |
1113 | |
1114 | if (unlikely(cancel)) { | |
b30ab791 AG |
1115 | drbd_free_peer_req(device, peer_req); |
1116 | dec_unacked(device); | |
99920dc5 | 1117 | return 0; |
b411b363 PR |
1118 | } |
1119 | ||
b30ab791 AG |
1120 | if (get_ldev(device)) { |
1121 | drbd_rs_complete_io(device, peer_req->i.sector); | |
1122 | put_ldev(device); | |
1d53f09e | 1123 | } |
b411b363 | 1124 | |
db830c46 | 1125 | di = peer_req->digest; |
b411b363 | 1126 | |
db830c46 | 1127 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1128 | /* quick hack to try to avoid a race against reconfiguration. |
1129 | * a real fix would be much more involved, | |
1130 | * introducing more locking mechanisms */ | |
6780139c AG |
1131 | if (peer_device->connection->csums_tfm) { |
1132 | digest_size = crypto_hash_digestsize(peer_device->connection->csums_tfm); | |
0b0ba1ef | 1133 | D_ASSERT(device, digest_size == di->digest_size); |
b411b363 PR |
1134 | digest = kmalloc(digest_size, GFP_NOIO); |
1135 | } | |
1136 | if (digest) { | |
6780139c | 1137 | drbd_csum_ee(peer_device->connection->csums_tfm, peer_req, digest); |
b411b363 PR |
1138 | eq = !memcmp(digest, di->digest, digest_size); |
1139 | kfree(digest); | |
1140 | } | |
1141 | ||
1142 | if (eq) { | |
b30ab791 | 1143 | drbd_set_in_sync(device, peer_req->i.sector, peer_req->i.size); |
676396d5 | 1144 | /* rs_same_csums unit is BM_BLOCK_SIZE */ |
b30ab791 | 1145 | device->rs_same_csum += peer_req->i.size >> BM_BLOCK_SHIFT; |
6780139c | 1146 | err = drbd_send_ack(peer_device, P_RS_IS_IN_SYNC, peer_req); |
b411b363 | 1147 | } else { |
b30ab791 | 1148 | inc_rs_pending(device); |
db830c46 AG |
1149 | peer_req->block_id = ID_SYNCER; /* By setting block_id, digest pointer becomes invalid! */ |
1150 | peer_req->flags &= ~EE_HAS_DIGEST; /* This peer request no longer has a digest pointer */ | |
204bba99 | 1151 | kfree(di); |
6780139c | 1152 | err = drbd_send_block(peer_device, P_RS_DATA_REPLY, peer_req); |
b411b363 PR |
1153 | } |
1154 | } else { | |
6780139c | 1155 | err = drbd_send_ack(peer_device, P_NEG_RS_DREPLY, peer_req); |
b411b363 | 1156 | if (__ratelimit(&drbd_ratelimit_state)) |
d0180171 | 1157 | drbd_err(device, "Sending NegDReply. I guess it gets messy.\n"); |
b411b363 PR |
1158 | } |
1159 | ||
b30ab791 AG |
1160 | dec_unacked(device); |
1161 | move_to_net_ee_or_free(device, peer_req); | |
b411b363 | 1162 | |
99920dc5 | 1163 | if (unlikely(err)) |
d0180171 | 1164 | drbd_err(device, "drbd_send_block/ack() failed\n"); |
99920dc5 | 1165 | return err; |
b411b363 PR |
1166 | } |
1167 | ||
99920dc5 | 1168 | int w_e_end_ov_req(struct drbd_work *w, int cancel) |
b411b363 | 1169 | { |
a8cd15ba | 1170 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
1171 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
1172 | struct drbd_device *device = peer_device->device; | |
db830c46 AG |
1173 | sector_t sector = peer_req->i.sector; |
1174 | unsigned int size = peer_req->i.size; | |
b411b363 PR |
1175 | int digest_size; |
1176 | void *digest; | |
99920dc5 | 1177 | int err = 0; |
b411b363 PR |
1178 | |
1179 | if (unlikely(cancel)) | |
1180 | goto out; | |
1181 | ||
6780139c | 1182 | digest_size = crypto_hash_digestsize(peer_device->connection->verify_tfm); |
b411b363 | 1183 | digest = kmalloc(digest_size, GFP_NOIO); |
8f21420e | 1184 | if (!digest) { |
99920dc5 | 1185 | err = 1; /* terminate the connection in case the allocation failed */ |
8f21420e | 1186 | goto out; |
b411b363 PR |
1187 | } |
1188 | ||
db830c46 | 1189 | if (likely(!(peer_req->flags & EE_WAS_ERROR))) |
6780139c | 1190 | drbd_csum_ee(peer_device->connection->verify_tfm, peer_req, digest); |
8f21420e PR |
1191 | else |
1192 | memset(digest, 0, digest_size); | |
1193 | ||
53ea4331 LE |
1194 | /* Free e and pages before send. |
1195 | * In case we block on congestion, we could otherwise run into | |
1196 | * some distributed deadlock, if the other side blocks on | |
1197 | * congestion as well, because our receiver blocks in | |
c37c8ecf | 1198 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
b30ab791 | 1199 | drbd_free_peer_req(device, peer_req); |
db830c46 | 1200 | peer_req = NULL; |
b30ab791 | 1201 | inc_rs_pending(device); |
6780139c | 1202 | err = drbd_send_drequest_csum(peer_device, sector, size, digest, digest_size, P_OV_REPLY); |
99920dc5 | 1203 | if (err) |
b30ab791 | 1204 | dec_rs_pending(device); |
8f21420e PR |
1205 | kfree(digest); |
1206 | ||
b411b363 | 1207 | out: |
db830c46 | 1208 | if (peer_req) |
b30ab791 AG |
1209 | drbd_free_peer_req(device, peer_req); |
1210 | dec_unacked(device); | |
99920dc5 | 1211 | return err; |
b411b363 PR |
1212 | } |
1213 | ||
b30ab791 | 1214 | void drbd_ov_out_of_sync_found(struct drbd_device *device, sector_t sector, int size) |
b411b363 | 1215 | { |
b30ab791 AG |
1216 | if (device->ov_last_oos_start + device->ov_last_oos_size == sector) { |
1217 | device->ov_last_oos_size += size>>9; | |
b411b363 | 1218 | } else { |
b30ab791 AG |
1219 | device->ov_last_oos_start = sector; |
1220 | device->ov_last_oos_size = size>>9; | |
b411b363 | 1221 | } |
b30ab791 | 1222 | drbd_set_out_of_sync(device, sector, size); |
b411b363 PR |
1223 | } |
1224 | ||
99920dc5 | 1225 | int w_e_end_ov_reply(struct drbd_work *w, int cancel) |
b411b363 | 1226 | { |
a8cd15ba | 1227 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
6780139c AG |
1228 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
1229 | struct drbd_device *device = peer_device->device; | |
b411b363 | 1230 | struct digest_info *di; |
b411b363 | 1231 | void *digest; |
db830c46 AG |
1232 | sector_t sector = peer_req->i.sector; |
1233 | unsigned int size = peer_req->i.size; | |
53ea4331 | 1234 | int digest_size; |
99920dc5 | 1235 | int err, eq = 0; |
58ffa580 | 1236 | bool stop_sector_reached = false; |
b411b363 PR |
1237 | |
1238 | if (unlikely(cancel)) { | |
b30ab791 AG |
1239 | drbd_free_peer_req(device, peer_req); |
1240 | dec_unacked(device); | |
99920dc5 | 1241 | return 0; |
b411b363 PR |
1242 | } |
1243 | ||
1244 | /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all | |
1245 | * the resync lru has been cleaned up already */ | |
b30ab791 AG |
1246 | if (get_ldev(device)) { |
1247 | drbd_rs_complete_io(device, peer_req->i.sector); | |
1248 | put_ldev(device); | |
1d53f09e | 1249 | } |
b411b363 | 1250 | |
db830c46 | 1251 | di = peer_req->digest; |
b411b363 | 1252 | |
db830c46 | 1253 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
6780139c | 1254 | digest_size = crypto_hash_digestsize(peer_device->connection->verify_tfm); |
b411b363 PR |
1255 | digest = kmalloc(digest_size, GFP_NOIO); |
1256 | if (digest) { | |
6780139c | 1257 | drbd_csum_ee(peer_device->connection->verify_tfm, peer_req, digest); |
b411b363 | 1258 | |
0b0ba1ef | 1259 | D_ASSERT(device, digest_size == di->digest_size); |
b411b363 PR |
1260 | eq = !memcmp(digest, di->digest, digest_size); |
1261 | kfree(digest); | |
1262 | } | |
b411b363 PR |
1263 | } |
1264 | ||
9676c760 LE |
1265 | /* Free peer_req and pages before send. |
1266 | * In case we block on congestion, we could otherwise run into | |
1267 | * some distributed deadlock, if the other side blocks on | |
1268 | * congestion as well, because our receiver blocks in | |
c37c8ecf | 1269 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
b30ab791 | 1270 | drbd_free_peer_req(device, peer_req); |
b411b363 | 1271 | if (!eq) |
b30ab791 | 1272 | drbd_ov_out_of_sync_found(device, sector, size); |
b411b363 | 1273 | else |
b30ab791 | 1274 | ov_out_of_sync_print(device); |
b411b363 | 1275 | |
6780139c | 1276 | err = drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, size, |
fa79abd8 | 1277 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); |
b411b363 | 1278 | |
b30ab791 | 1279 | dec_unacked(device); |
b411b363 | 1280 | |
b30ab791 | 1281 | --device->ov_left; |
ea5442af LE |
1282 | |
1283 | /* let's advance progress step marks only for every other megabyte */ | |
b30ab791 AG |
1284 | if ((device->ov_left & 0x200) == 0x200) |
1285 | drbd_advance_rs_marks(device, device->ov_left); | |
ea5442af | 1286 | |
b30ab791 AG |
1287 | stop_sector_reached = verify_can_do_stop_sector(device) && |
1288 | (sector + (size>>9)) >= device->ov_stop_sector; | |
58ffa580 | 1289 | |
b30ab791 AG |
1290 | if (device->ov_left == 0 || stop_sector_reached) { |
1291 | ov_out_of_sync_print(device); | |
1292 | drbd_resync_finished(device); | |
b411b363 PR |
1293 | } |
1294 | ||
99920dc5 | 1295 | return err; |
b411b363 PR |
1296 | } |
1297 | ||
b6dd1a89 LE |
1298 | /* FIXME |
1299 | * We need to track the number of pending barrier acks, | |
1300 | * and to be able to wait for them. | |
1301 | * See also comment in drbd_adm_attach before drbd_suspend_io. | |
1302 | */ | |
bde89a9e | 1303 | static int drbd_send_barrier(struct drbd_connection *connection) |
b411b363 | 1304 | { |
9f5bdc33 | 1305 | struct p_barrier *p; |
b6dd1a89 | 1306 | struct drbd_socket *sock; |
b411b363 | 1307 | |
bde89a9e AG |
1308 | sock = &connection->data; |
1309 | p = conn_prepare_command(connection, sock); | |
9f5bdc33 AG |
1310 | if (!p) |
1311 | return -EIO; | |
bde89a9e | 1312 | p->barrier = connection->send.current_epoch_nr; |
b6dd1a89 | 1313 | p->pad = 0; |
bde89a9e | 1314 | connection->send.current_epoch_writes = 0; |
b6dd1a89 | 1315 | |
bde89a9e | 1316 | return conn_send_command(connection, sock, P_BARRIER, sizeof(*p), NULL, 0); |
b411b363 PR |
1317 | } |
1318 | ||
99920dc5 | 1319 | int w_send_write_hint(struct drbd_work *w, int cancel) |
b411b363 | 1320 | { |
84b8c06b AG |
1321 | struct drbd_device *device = |
1322 | container_of(w, struct drbd_device, unplug_work); | |
9f5bdc33 AG |
1323 | struct drbd_socket *sock; |
1324 | ||
b411b363 | 1325 | if (cancel) |
99920dc5 | 1326 | return 0; |
a6b32bc3 | 1327 | sock = &first_peer_device(device)->connection->data; |
69a22773 | 1328 | if (!drbd_prepare_command(first_peer_device(device), sock)) |
9f5bdc33 | 1329 | return -EIO; |
69a22773 | 1330 | return drbd_send_command(first_peer_device(device), sock, P_UNPLUG_REMOTE, 0, NULL, 0); |
b411b363 PR |
1331 | } |
1332 | ||
bde89a9e | 1333 | static void re_init_if_first_write(struct drbd_connection *connection, unsigned int epoch) |
4eb9b3cb | 1334 | { |
bde89a9e AG |
1335 | if (!connection->send.seen_any_write_yet) { |
1336 | connection->send.seen_any_write_yet = true; | |
1337 | connection->send.current_epoch_nr = epoch; | |
1338 | connection->send.current_epoch_writes = 0; | |
4eb9b3cb LE |
1339 | } |
1340 | } | |
1341 | ||
bde89a9e | 1342 | static void maybe_send_barrier(struct drbd_connection *connection, unsigned int epoch) |
4eb9b3cb LE |
1343 | { |
1344 | /* re-init if first write on this connection */ | |
bde89a9e | 1345 | if (!connection->send.seen_any_write_yet) |
4eb9b3cb | 1346 | return; |
bde89a9e AG |
1347 | if (connection->send.current_epoch_nr != epoch) { |
1348 | if (connection->send.current_epoch_writes) | |
1349 | drbd_send_barrier(connection); | |
1350 | connection->send.current_epoch_nr = epoch; | |
4eb9b3cb LE |
1351 | } |
1352 | } | |
1353 | ||
8f7bed77 | 1354 | int w_send_out_of_sync(struct drbd_work *w, int cancel) |
73a01a18 PR |
1355 | { |
1356 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
84b8c06b | 1357 | struct drbd_device *device = req->device; |
44a4d551 LE |
1358 | struct drbd_peer_device *const peer_device = first_peer_device(device); |
1359 | struct drbd_connection *const connection = peer_device->connection; | |
99920dc5 | 1360 | int err; |
73a01a18 PR |
1361 | |
1362 | if (unlikely(cancel)) { | |
8554df1c | 1363 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1364 | return 0; |
73a01a18 | 1365 | } |
e5f891b2 | 1366 | req->pre_send_jif = jiffies; |
73a01a18 | 1367 | |
bde89a9e | 1368 | /* this time, no connection->send.current_epoch_writes++; |
b6dd1a89 LE |
1369 | * If it was sent, it was the closing barrier for the last |
1370 | * replicated epoch, before we went into AHEAD mode. | |
1371 | * No more barriers will be sent, until we leave AHEAD mode again. */ | |
bde89a9e | 1372 | maybe_send_barrier(connection, req->epoch); |
b6dd1a89 | 1373 | |
44a4d551 | 1374 | err = drbd_send_out_of_sync(peer_device, req); |
8554df1c | 1375 | req_mod(req, OOS_HANDED_TO_NETWORK); |
73a01a18 | 1376 | |
99920dc5 | 1377 | return err; |
73a01a18 PR |
1378 | } |
1379 | ||
b411b363 PR |
1380 | /** |
1381 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request | |
b411b363 PR |
1382 | * @w: work object. |
1383 | * @cancel: The connection will be closed anyways | |
1384 | */ | |
99920dc5 | 1385 | int w_send_dblock(struct drbd_work *w, int cancel) |
b411b363 PR |
1386 | { |
1387 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
84b8c06b | 1388 | struct drbd_device *device = req->device; |
44a4d551 LE |
1389 | struct drbd_peer_device *const peer_device = first_peer_device(device); |
1390 | struct drbd_connection *connection = peer_device->connection; | |
99920dc5 | 1391 | int err; |
b411b363 PR |
1392 | |
1393 | if (unlikely(cancel)) { | |
8554df1c | 1394 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1395 | return 0; |
b411b363 | 1396 | } |
e5f891b2 | 1397 | req->pre_send_jif = jiffies; |
b411b363 | 1398 | |
bde89a9e AG |
1399 | re_init_if_first_write(connection, req->epoch); |
1400 | maybe_send_barrier(connection, req->epoch); | |
1401 | connection->send.current_epoch_writes++; | |
b6dd1a89 | 1402 | |
44a4d551 | 1403 | err = drbd_send_dblock(peer_device, req); |
99920dc5 | 1404 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK); |
b411b363 | 1405 | |
99920dc5 | 1406 | return err; |
b411b363 PR |
1407 | } |
1408 | ||
1409 | /** | |
1410 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet | |
b411b363 PR |
1411 | * @w: work object. |
1412 | * @cancel: The connection will be closed anyways | |
1413 | */ | |
99920dc5 | 1414 | int w_send_read_req(struct drbd_work *w, int cancel) |
b411b363 PR |
1415 | { |
1416 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
84b8c06b | 1417 | struct drbd_device *device = req->device; |
44a4d551 LE |
1418 | struct drbd_peer_device *const peer_device = first_peer_device(device); |
1419 | struct drbd_connection *connection = peer_device->connection; | |
99920dc5 | 1420 | int err; |
b411b363 PR |
1421 | |
1422 | if (unlikely(cancel)) { | |
8554df1c | 1423 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1424 | return 0; |
b411b363 | 1425 | } |
e5f891b2 | 1426 | req->pre_send_jif = jiffies; |
b411b363 | 1427 | |
b6dd1a89 LE |
1428 | /* Even read requests may close a write epoch, |
1429 | * if there was any yet. */ | |
bde89a9e | 1430 | maybe_send_barrier(connection, req->epoch); |
b6dd1a89 | 1431 | |
44a4d551 | 1432 | err = drbd_send_drequest(peer_device, P_DATA_REQUEST, req->i.sector, req->i.size, |
6c1005e7 | 1433 | (unsigned long)req); |
b411b363 | 1434 | |
99920dc5 | 1435 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK); |
b411b363 | 1436 | |
99920dc5 | 1437 | return err; |
b411b363 PR |
1438 | } |
1439 | ||
99920dc5 | 1440 | int w_restart_disk_io(struct drbd_work *w, int cancel) |
265be2d0 PR |
1441 | { |
1442 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
84b8c06b | 1443 | struct drbd_device *device = req->device; |
265be2d0 | 1444 | |
0778286a | 1445 | if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG) |
4dd726f0 | 1446 | drbd_al_begin_io(device, &req->i); |
265be2d0 PR |
1447 | |
1448 | drbd_req_make_private_bio(req, req->master_bio); | |
b30ab791 | 1449 | req->private_bio->bi_bdev = device->ldev->backing_bdev; |
265be2d0 PR |
1450 | generic_make_request(req->private_bio); |
1451 | ||
99920dc5 | 1452 | return 0; |
265be2d0 PR |
1453 | } |
1454 | ||
b30ab791 | 1455 | static int _drbd_may_sync_now(struct drbd_device *device) |
b411b363 | 1456 | { |
b30ab791 | 1457 | struct drbd_device *odev = device; |
95f8efd0 | 1458 | int resync_after; |
b411b363 PR |
1459 | |
1460 | while (1) { | |
a3f8f7dc | 1461 | if (!odev->ldev || odev->state.disk == D_DISKLESS) |
438c8374 | 1462 | return 1; |
daeda1cc | 1463 | rcu_read_lock(); |
95f8efd0 | 1464 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after; |
daeda1cc | 1465 | rcu_read_unlock(); |
95f8efd0 | 1466 | if (resync_after == -1) |
b411b363 | 1467 | return 1; |
b30ab791 | 1468 | odev = minor_to_device(resync_after); |
a3f8f7dc | 1469 | if (!odev) |
841ce241 | 1470 | return 1; |
b411b363 PR |
1471 | if ((odev->state.conn >= C_SYNC_SOURCE && |
1472 | odev->state.conn <= C_PAUSED_SYNC_T) || | |
1473 | odev->state.aftr_isp || odev->state.peer_isp || | |
1474 | odev->state.user_isp) | |
1475 | return 0; | |
1476 | } | |
1477 | } | |
1478 | ||
1479 | /** | |
1480 | * _drbd_pause_after() - Pause resync on all devices that may not resync now | |
b30ab791 | 1481 | * @device: DRBD device. |
b411b363 PR |
1482 | * |
1483 | * Called from process context only (admin command and after_state_ch). | |
1484 | */ | |
b30ab791 | 1485 | static int _drbd_pause_after(struct drbd_device *device) |
b411b363 | 1486 | { |
54761697 | 1487 | struct drbd_device *odev; |
b411b363 PR |
1488 | int i, rv = 0; |
1489 | ||
695d08fa | 1490 | rcu_read_lock(); |
05a10ec7 | 1491 | idr_for_each_entry(&drbd_devices, odev, i) { |
b411b363 PR |
1492 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
1493 | continue; | |
1494 | if (!_drbd_may_sync_now(odev)) | |
1495 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL) | |
1496 | != SS_NOTHING_TO_DO); | |
1497 | } | |
695d08fa | 1498 | rcu_read_unlock(); |
b411b363 PR |
1499 | |
1500 | return rv; | |
1501 | } | |
1502 | ||
1503 | /** | |
1504 | * _drbd_resume_next() - Resume resync on all devices that may resync now | |
b30ab791 | 1505 | * @device: DRBD device. |
b411b363 PR |
1506 | * |
1507 | * Called from process context only (admin command and worker). | |
1508 | */ | |
b30ab791 | 1509 | static int _drbd_resume_next(struct drbd_device *device) |
b411b363 | 1510 | { |
54761697 | 1511 | struct drbd_device *odev; |
b411b363 PR |
1512 | int i, rv = 0; |
1513 | ||
695d08fa | 1514 | rcu_read_lock(); |
05a10ec7 | 1515 | idr_for_each_entry(&drbd_devices, odev, i) { |
b411b363 PR |
1516 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
1517 | continue; | |
1518 | if (odev->state.aftr_isp) { | |
1519 | if (_drbd_may_sync_now(odev)) | |
1520 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0), | |
1521 | CS_HARD, NULL) | |
1522 | != SS_NOTHING_TO_DO) ; | |
1523 | } | |
1524 | } | |
695d08fa | 1525 | rcu_read_unlock(); |
b411b363 PR |
1526 | return rv; |
1527 | } | |
1528 | ||
b30ab791 | 1529 | void resume_next_sg(struct drbd_device *device) |
b411b363 PR |
1530 | { |
1531 | write_lock_irq(&global_state_lock); | |
b30ab791 | 1532 | _drbd_resume_next(device); |
b411b363 PR |
1533 | write_unlock_irq(&global_state_lock); |
1534 | } | |
1535 | ||
b30ab791 | 1536 | void suspend_other_sg(struct drbd_device *device) |
b411b363 PR |
1537 | { |
1538 | write_lock_irq(&global_state_lock); | |
b30ab791 | 1539 | _drbd_pause_after(device); |
b411b363 PR |
1540 | write_unlock_irq(&global_state_lock); |
1541 | } | |
1542 | ||
dc97b708 | 1543 | /* caller must hold global_state_lock */ |
b30ab791 | 1544 | enum drbd_ret_code drbd_resync_after_valid(struct drbd_device *device, int o_minor) |
b411b363 | 1545 | { |
54761697 | 1546 | struct drbd_device *odev; |
95f8efd0 | 1547 | int resync_after; |
b411b363 PR |
1548 | |
1549 | if (o_minor == -1) | |
1550 | return NO_ERROR; | |
a3f8f7dc | 1551 | if (o_minor < -1 || o_minor > MINORMASK) |
95f8efd0 | 1552 | return ERR_RESYNC_AFTER; |
b411b363 PR |
1553 | |
1554 | /* check for loops */ | |
b30ab791 | 1555 | odev = minor_to_device(o_minor); |
b411b363 | 1556 | while (1) { |
b30ab791 | 1557 | if (odev == device) |
95f8efd0 | 1558 | return ERR_RESYNC_AFTER_CYCLE; |
b411b363 | 1559 | |
a3f8f7dc LE |
1560 | /* You are free to depend on diskless, non-existing, |
1561 | * or not yet/no longer existing minors. | |
1562 | * We only reject dependency loops. | |
1563 | * We cannot follow the dependency chain beyond a detached or | |
1564 | * missing minor. | |
1565 | */ | |
1566 | if (!odev || !odev->ldev || odev->state.disk == D_DISKLESS) | |
1567 | return NO_ERROR; | |
1568 | ||
daeda1cc | 1569 | rcu_read_lock(); |
95f8efd0 | 1570 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after; |
daeda1cc | 1571 | rcu_read_unlock(); |
b411b363 | 1572 | /* dependency chain ends here, no cycles. */ |
95f8efd0 | 1573 | if (resync_after == -1) |
b411b363 PR |
1574 | return NO_ERROR; |
1575 | ||
1576 | /* follow the dependency chain */ | |
b30ab791 | 1577 | odev = minor_to_device(resync_after); |
b411b363 PR |
1578 | } |
1579 | } | |
1580 | ||
dc97b708 | 1581 | /* caller must hold global_state_lock */ |
b30ab791 | 1582 | void drbd_resync_after_changed(struct drbd_device *device) |
b411b363 PR |
1583 | { |
1584 | int changes; | |
b411b363 | 1585 | |
dc97b708 | 1586 | do { |
b30ab791 AG |
1587 | changes = _drbd_pause_after(device); |
1588 | changes |= _drbd_resume_next(device); | |
dc97b708 | 1589 | } while (changes); |
b411b363 PR |
1590 | } |
1591 | ||
b30ab791 | 1592 | void drbd_rs_controller_reset(struct drbd_device *device) |
9bd28d3c | 1593 | { |
813472ce PR |
1594 | struct fifo_buffer *plan; |
1595 | ||
b30ab791 AG |
1596 | atomic_set(&device->rs_sect_in, 0); |
1597 | atomic_set(&device->rs_sect_ev, 0); | |
1598 | device->rs_in_flight = 0; | |
813472ce PR |
1599 | |
1600 | /* Updating the RCU protected object in place is necessary since | |
1601 | this function gets called from atomic context. | |
1602 | It is valid since all other updates also lead to an completely | |
1603 | empty fifo */ | |
1604 | rcu_read_lock(); | |
b30ab791 | 1605 | plan = rcu_dereference(device->rs_plan_s); |
813472ce PR |
1606 | plan->total = 0; |
1607 | fifo_set(plan, 0); | |
1608 | rcu_read_unlock(); | |
9bd28d3c LE |
1609 | } |
1610 | ||
1f04af33 PR |
1611 | void start_resync_timer_fn(unsigned long data) |
1612 | { | |
b30ab791 | 1613 | struct drbd_device *device = (struct drbd_device *) data; |
ac0acb9e | 1614 | drbd_device_post_work(device, RS_START); |
1f04af33 PR |
1615 | } |
1616 | ||
ac0acb9e | 1617 | static void do_start_resync(struct drbd_device *device) |
1f04af33 | 1618 | { |
b30ab791 | 1619 | if (atomic_read(&device->unacked_cnt) || atomic_read(&device->rs_pending_cnt)) { |
ac0acb9e | 1620 | drbd_warn(device, "postponing start_resync ...\n"); |
b30ab791 AG |
1621 | device->start_resync_timer.expires = jiffies + HZ/10; |
1622 | add_timer(&device->start_resync_timer); | |
ac0acb9e | 1623 | return; |
1f04af33 PR |
1624 | } |
1625 | ||
b30ab791 AG |
1626 | drbd_start_resync(device, C_SYNC_SOURCE); |
1627 | clear_bit(AHEAD_TO_SYNC_SOURCE, &device->flags); | |
1f04af33 PR |
1628 | } |
1629 | ||
aaaba345 LE |
1630 | static bool use_checksum_based_resync(struct drbd_connection *connection, struct drbd_device *device) |
1631 | { | |
1632 | bool csums_after_crash_only; | |
1633 | rcu_read_lock(); | |
1634 | csums_after_crash_only = rcu_dereference(connection->net_conf)->csums_after_crash_only; | |
1635 | rcu_read_unlock(); | |
1636 | return connection->agreed_pro_version >= 89 && /* supported? */ | |
1637 | connection->csums_tfm && /* configured? */ | |
1638 | (csums_after_crash_only == 0 /* use for each resync? */ | |
1639 | || test_bit(CRASHED_PRIMARY, &device->flags)); /* or only after Primary crash? */ | |
1640 | } | |
1641 | ||
b411b363 PR |
1642 | /** |
1643 | * drbd_start_resync() - Start the resync process | |
b30ab791 | 1644 | * @device: DRBD device. |
b411b363 PR |
1645 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET |
1646 | * | |
1647 | * This function might bring you directly into one of the | |
1648 | * C_PAUSED_SYNC_* states. | |
1649 | */ | |
b30ab791 | 1650 | void drbd_start_resync(struct drbd_device *device, enum drbd_conns side) |
b411b363 | 1651 | { |
44a4d551 LE |
1652 | struct drbd_peer_device *peer_device = first_peer_device(device); |
1653 | struct drbd_connection *connection = peer_device ? peer_device->connection : NULL; | |
b411b363 PR |
1654 | union drbd_state ns; |
1655 | int r; | |
1656 | ||
b30ab791 | 1657 | if (device->state.conn >= C_SYNC_SOURCE && device->state.conn < C_AHEAD) { |
d0180171 | 1658 | drbd_err(device, "Resync already running!\n"); |
b411b363 PR |
1659 | return; |
1660 | } | |
1661 | ||
b30ab791 | 1662 | if (!test_bit(B_RS_H_DONE, &device->flags)) { |
e64a3294 PR |
1663 | if (side == C_SYNC_TARGET) { |
1664 | /* Since application IO was locked out during C_WF_BITMAP_T and | |
1665 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET | |
1666 | we check that we might make the data inconsistent. */ | |
b30ab791 | 1667 | r = drbd_khelper(device, "before-resync-target"); |
e64a3294 PR |
1668 | r = (r >> 8) & 0xff; |
1669 | if (r > 0) { | |
d0180171 | 1670 | drbd_info(device, "before-resync-target handler returned %d, " |
09b9e797 | 1671 | "dropping connection.\n", r); |
44a4d551 | 1672 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
09b9e797 PR |
1673 | return; |
1674 | } | |
e64a3294 | 1675 | } else /* C_SYNC_SOURCE */ { |
b30ab791 | 1676 | r = drbd_khelper(device, "before-resync-source"); |
e64a3294 PR |
1677 | r = (r >> 8) & 0xff; |
1678 | if (r > 0) { | |
1679 | if (r == 3) { | |
d0180171 | 1680 | drbd_info(device, "before-resync-source handler returned %d, " |
e64a3294 PR |
1681 | "ignoring. Old userland tools?", r); |
1682 | } else { | |
d0180171 | 1683 | drbd_info(device, "before-resync-source handler returned %d, " |
e64a3294 | 1684 | "dropping connection.\n", r); |
44a4d551 | 1685 | conn_request_state(connection, |
a6b32bc3 | 1686 | NS(conn, C_DISCONNECTING), CS_HARD); |
e64a3294 PR |
1687 | return; |
1688 | } | |
1689 | } | |
09b9e797 | 1690 | } |
b411b363 PR |
1691 | } |
1692 | ||
44a4d551 | 1693 | if (current == connection->worker.task) { |
dad20554 | 1694 | /* The worker should not sleep waiting for state_mutex, |
e64a3294 | 1695 | that can take long */ |
b30ab791 AG |
1696 | if (!mutex_trylock(device->state_mutex)) { |
1697 | set_bit(B_RS_H_DONE, &device->flags); | |
1698 | device->start_resync_timer.expires = jiffies + HZ/5; | |
1699 | add_timer(&device->start_resync_timer); | |
e64a3294 PR |
1700 | return; |
1701 | } | |
1702 | } else { | |
b30ab791 | 1703 | mutex_lock(device->state_mutex); |
e64a3294 | 1704 | } |
b30ab791 | 1705 | clear_bit(B_RS_H_DONE, &device->flags); |
b411b363 | 1706 | |
074f4afe LE |
1707 | /* req_lock: serialize with drbd_send_and_submit() and others |
1708 | * global_state_lock: for stable sync-after dependencies */ | |
1709 | spin_lock_irq(&device->resource->req_lock); | |
1710 | write_lock(&global_state_lock); | |
a700471b | 1711 | /* Did some connection breakage or IO error race with us? */ |
b30ab791 AG |
1712 | if (device->state.conn < C_CONNECTED |
1713 | || !get_ldev_if_state(device, D_NEGOTIATING)) { | |
074f4afe LE |
1714 | write_unlock(&global_state_lock); |
1715 | spin_unlock_irq(&device->resource->req_lock); | |
b30ab791 | 1716 | mutex_unlock(device->state_mutex); |
b411b363 PR |
1717 | return; |
1718 | } | |
1719 | ||
b30ab791 | 1720 | ns = drbd_read_state(device); |
b411b363 | 1721 | |
b30ab791 | 1722 | ns.aftr_isp = !_drbd_may_sync_now(device); |
b411b363 PR |
1723 | |
1724 | ns.conn = side; | |
1725 | ||
1726 | if (side == C_SYNC_TARGET) | |
1727 | ns.disk = D_INCONSISTENT; | |
1728 | else /* side == C_SYNC_SOURCE */ | |
1729 | ns.pdsk = D_INCONSISTENT; | |
1730 | ||
b30ab791 AG |
1731 | r = __drbd_set_state(device, ns, CS_VERBOSE, NULL); |
1732 | ns = drbd_read_state(device); | |
b411b363 PR |
1733 | |
1734 | if (ns.conn < C_CONNECTED) | |
1735 | r = SS_UNKNOWN_ERROR; | |
1736 | ||
1737 | if (r == SS_SUCCESS) { | |
b30ab791 | 1738 | unsigned long tw = drbd_bm_total_weight(device); |
1d7734a0 LE |
1739 | unsigned long now = jiffies; |
1740 | int i; | |
1741 | ||
b30ab791 AG |
1742 | device->rs_failed = 0; |
1743 | device->rs_paused = 0; | |
1744 | device->rs_same_csum = 0; | |
1745 | device->rs_last_events = 0; | |
1746 | device->rs_last_sect_ev = 0; | |
1747 | device->rs_total = tw; | |
1748 | device->rs_start = now; | |
1d7734a0 | 1749 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
b30ab791 AG |
1750 | device->rs_mark_left[i] = tw; |
1751 | device->rs_mark_time[i] = now; | |
1d7734a0 | 1752 | } |
b30ab791 | 1753 | _drbd_pause_after(device); |
5ab7d2c0 LE |
1754 | /* Forget potentially stale cached per resync extent bit-counts. |
1755 | * Open coded drbd_rs_cancel_all(device), we already have IRQs | |
1756 | * disabled, and know the disk state is ok. */ | |
1757 | spin_lock(&device->al_lock); | |
1758 | lc_reset(device->resync); | |
1759 | device->resync_locked = 0; | |
1760 | device->resync_wenr = LC_FREE; | |
1761 | spin_unlock(&device->al_lock); | |
b411b363 | 1762 | } |
074f4afe LE |
1763 | write_unlock(&global_state_lock); |
1764 | spin_unlock_irq(&device->resource->req_lock); | |
5a22db89 | 1765 | |
b411b363 | 1766 | if (r == SS_SUCCESS) { |
5ab7d2c0 | 1767 | wake_up(&device->al_wait); /* for lc_reset() above */ |
328e0f12 PR |
1768 | /* reset rs_last_bcast when a resync or verify is started, |
1769 | * to deal with potential jiffies wrap. */ | |
b30ab791 | 1770 | device->rs_last_bcast = jiffies - HZ; |
328e0f12 | 1771 | |
d0180171 | 1772 | drbd_info(device, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", |
b411b363 | 1773 | drbd_conn_str(ns.conn), |
b30ab791 AG |
1774 | (unsigned long) device->rs_total << (BM_BLOCK_SHIFT-10), |
1775 | (unsigned long) device->rs_total); | |
aaaba345 | 1776 | if (side == C_SYNC_TARGET) { |
b30ab791 | 1777 | device->bm_resync_fo = 0; |
aaaba345 LE |
1778 | device->use_csums = use_checksum_based_resync(connection, device); |
1779 | } else { | |
1780 | device->use_csums = 0; | |
1781 | } | |
6c922ed5 LE |
1782 | |
1783 | /* Since protocol 96, we must serialize drbd_gen_and_send_sync_uuid | |
1784 | * with w_send_oos, or the sync target will get confused as to | |
1785 | * how much bits to resync. We cannot do that always, because for an | |
1786 | * empty resync and protocol < 95, we need to do it here, as we call | |
1787 | * drbd_resync_finished from here in that case. | |
1788 | * We drbd_gen_and_send_sync_uuid here for protocol < 96, | |
1789 | * and from after_state_ch otherwise. */ | |
44a4d551 LE |
1790 | if (side == C_SYNC_SOURCE && connection->agreed_pro_version < 96) |
1791 | drbd_gen_and_send_sync_uuid(peer_device); | |
b411b363 | 1792 | |
44a4d551 | 1793 | if (connection->agreed_pro_version < 95 && device->rs_total == 0) { |
af85e8e8 LE |
1794 | /* This still has a race (about when exactly the peers |
1795 | * detect connection loss) that can lead to a full sync | |
1796 | * on next handshake. In 8.3.9 we fixed this with explicit | |
1797 | * resync-finished notifications, but the fix | |
1798 | * introduces a protocol change. Sleeping for some | |
1799 | * time longer than the ping interval + timeout on the | |
1800 | * SyncSource, to give the SyncTarget the chance to | |
1801 | * detect connection loss, then waiting for a ping | |
1802 | * response (implicit in drbd_resync_finished) reduces | |
1803 | * the race considerably, but does not solve it. */ | |
44ed167d PR |
1804 | if (side == C_SYNC_SOURCE) { |
1805 | struct net_conf *nc; | |
1806 | int timeo; | |
1807 | ||
1808 | rcu_read_lock(); | |
44a4d551 | 1809 | nc = rcu_dereference(connection->net_conf); |
44ed167d PR |
1810 | timeo = nc->ping_int * HZ + nc->ping_timeo * HZ / 9; |
1811 | rcu_read_unlock(); | |
1812 | schedule_timeout_interruptible(timeo); | |
1813 | } | |
b30ab791 | 1814 | drbd_resync_finished(device); |
b411b363 PR |
1815 | } |
1816 | ||
b30ab791 AG |
1817 | drbd_rs_controller_reset(device); |
1818 | /* ns.conn may already be != device->state.conn, | |
b411b363 PR |
1819 | * we may have been paused in between, or become paused until |
1820 | * the timer triggers. | |
1821 | * No matter, that is handled in resync_timer_fn() */ | |
1822 | if (ns.conn == C_SYNC_TARGET) | |
b30ab791 | 1823 | mod_timer(&device->resync_timer, jiffies); |
b411b363 | 1824 | |
b30ab791 | 1825 | drbd_md_sync(device); |
b411b363 | 1826 | } |
b30ab791 AG |
1827 | put_ldev(device); |
1828 | mutex_unlock(device->state_mutex); | |
b411b363 PR |
1829 | } |
1830 | ||
e334f550 | 1831 | static void update_on_disk_bitmap(struct drbd_device *device, bool resync_done) |
c7a58db4 LE |
1832 | { |
1833 | struct sib_info sib = { .sib_reason = SIB_SYNC_PROGRESS, }; | |
1834 | device->rs_last_bcast = jiffies; | |
1835 | ||
1836 | if (!get_ldev(device)) | |
1837 | return; | |
1838 | ||
1839 | drbd_bm_write_lazy(device, 0); | |
5ab7d2c0 | 1840 | if (resync_done && is_sync_state(device->state.conn)) |
c7a58db4 | 1841 | drbd_resync_finished(device); |
5ab7d2c0 | 1842 | |
c7a58db4 LE |
1843 | drbd_bcast_event(device, &sib); |
1844 | /* update timestamp, in case it took a while to write out stuff */ | |
1845 | device->rs_last_bcast = jiffies; | |
1846 | put_ldev(device); | |
1847 | } | |
1848 | ||
e334f550 LE |
1849 | static void drbd_ldev_destroy(struct drbd_device *device) |
1850 | { | |
1851 | lc_destroy(device->resync); | |
1852 | device->resync = NULL; | |
1853 | lc_destroy(device->act_log); | |
1854 | device->act_log = NULL; | |
1855 | __no_warn(local, | |
1856 | drbd_free_ldev(device->ldev); | |
1857 | device->ldev = NULL;); | |
1858 | clear_bit(GOING_DISKLESS, &device->flags); | |
1859 | wake_up(&device->misc_wait); | |
1860 | } | |
1861 | ||
1862 | static void go_diskless(struct drbd_device *device) | |
1863 | { | |
1864 | D_ASSERT(device, device->state.disk == D_FAILED); | |
1865 | /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will | |
1866 | * inc/dec it frequently. Once we are D_DISKLESS, no one will touch | |
1867 | * the protected members anymore, though, so once put_ldev reaches zero | |
1868 | * again, it will be safe to free them. */ | |
1869 | ||
1870 | /* Try to write changed bitmap pages, read errors may have just | |
1871 | * set some bits outside the area covered by the activity log. | |
1872 | * | |
1873 | * If we have an IO error during the bitmap writeout, | |
1874 | * we will want a full sync next time, just in case. | |
1875 | * (Do we want a specific meta data flag for this?) | |
1876 | * | |
1877 | * If that does not make it to stable storage either, | |
1878 | * we cannot do anything about that anymore. | |
1879 | * | |
1880 | * We still need to check if both bitmap and ldev are present, we may | |
1881 | * end up here after a failed attach, before ldev was even assigned. | |
1882 | */ | |
1883 | if (device->bitmap && device->ldev) { | |
1884 | /* An interrupted resync or similar is allowed to recounts bits | |
1885 | * while we detach. | |
1886 | * Any modifications would not be expected anymore, though. | |
1887 | */ | |
1888 | if (drbd_bitmap_io_from_worker(device, drbd_bm_write, | |
1889 | "detach", BM_LOCKED_TEST_ALLOWED)) { | |
1890 | if (test_bit(WAS_READ_ERROR, &device->flags)) { | |
1891 | drbd_md_set_flag(device, MDF_FULL_SYNC); | |
1892 | drbd_md_sync(device); | |
1893 | } | |
1894 | } | |
1895 | } | |
1896 | ||
1897 | drbd_force_state(device, NS(disk, D_DISKLESS)); | |
1898 | } | |
1899 | ||
ac0acb9e LE |
1900 | static int do_md_sync(struct drbd_device *device) |
1901 | { | |
1902 | drbd_warn(device, "md_sync_timer expired! Worker calls drbd_md_sync().\n"); | |
1903 | drbd_md_sync(device); | |
1904 | return 0; | |
1905 | } | |
1906 | ||
e334f550 LE |
1907 | #define WORK_PENDING(work_bit, todo) (todo & (1UL << work_bit)) |
1908 | static void do_device_work(struct drbd_device *device, const unsigned long todo) | |
1909 | { | |
ac0acb9e LE |
1910 | if (WORK_PENDING(MD_SYNC, todo)) |
1911 | do_md_sync(device); | |
e334f550 LE |
1912 | if (WORK_PENDING(RS_DONE, todo) || |
1913 | WORK_PENDING(RS_PROGRESS, todo)) | |
1914 | update_on_disk_bitmap(device, WORK_PENDING(RS_DONE, todo)); | |
1915 | if (WORK_PENDING(GO_DISKLESS, todo)) | |
1916 | go_diskless(device); | |
1917 | if (WORK_PENDING(DESTROY_DISK, todo)) | |
1918 | drbd_ldev_destroy(device); | |
ac0acb9e LE |
1919 | if (WORK_PENDING(RS_START, todo)) |
1920 | do_start_resync(device); | |
e334f550 LE |
1921 | } |
1922 | ||
1923 | #define DRBD_DEVICE_WORK_MASK \ | |
1924 | ((1UL << GO_DISKLESS) \ | |
1925 | |(1UL << DESTROY_DISK) \ | |
ac0acb9e LE |
1926 | |(1UL << MD_SYNC) \ |
1927 | |(1UL << RS_START) \ | |
e334f550 LE |
1928 | |(1UL << RS_PROGRESS) \ |
1929 | |(1UL << RS_DONE) \ | |
1930 | ) | |
1931 | ||
1932 | static unsigned long get_work_bits(unsigned long *flags) | |
1933 | { | |
1934 | unsigned long old, new; | |
1935 | do { | |
1936 | old = *flags; | |
1937 | new = old & ~DRBD_DEVICE_WORK_MASK; | |
1938 | } while (cmpxchg(flags, old, new) != old); | |
1939 | return old & DRBD_DEVICE_WORK_MASK; | |
1940 | } | |
1941 | ||
1942 | static void do_unqueued_work(struct drbd_connection *connection) | |
c7a58db4 LE |
1943 | { |
1944 | struct drbd_peer_device *peer_device; | |
1945 | int vnr; | |
1946 | ||
1947 | rcu_read_lock(); | |
1948 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { | |
1949 | struct drbd_device *device = peer_device->device; | |
e334f550 LE |
1950 | unsigned long todo = get_work_bits(&device->flags); |
1951 | if (!todo) | |
c7a58db4 | 1952 | continue; |
5ab7d2c0 | 1953 | |
c7a58db4 LE |
1954 | kref_get(&device->kref); |
1955 | rcu_read_unlock(); | |
e334f550 | 1956 | do_device_work(device, todo); |
c7a58db4 LE |
1957 | kref_put(&device->kref, drbd_destroy_device); |
1958 | rcu_read_lock(); | |
1959 | } | |
1960 | rcu_read_unlock(); | |
1961 | } | |
1962 | ||
a186e478 | 1963 | static bool dequeue_work_batch(struct drbd_work_queue *queue, struct list_head *work_list) |
8c0785a5 LE |
1964 | { |
1965 | spin_lock_irq(&queue->q_lock); | |
15e26f6a | 1966 | list_splice_tail_init(&queue->q, work_list); |
8c0785a5 LE |
1967 | spin_unlock_irq(&queue->q_lock); |
1968 | return !list_empty(work_list); | |
1969 | } | |
1970 | ||
a186e478 | 1971 | static bool dequeue_work_item(struct drbd_work_queue *queue, struct list_head *work_list) |
8c0785a5 LE |
1972 | { |
1973 | spin_lock_irq(&queue->q_lock); | |
1974 | if (!list_empty(&queue->q)) | |
1975 | list_move(queue->q.next, work_list); | |
1976 | spin_unlock_irq(&queue->q_lock); | |
1977 | return !list_empty(work_list); | |
1978 | } | |
1979 | ||
bde89a9e | 1980 | static void wait_for_work(struct drbd_connection *connection, struct list_head *work_list) |
b6dd1a89 LE |
1981 | { |
1982 | DEFINE_WAIT(wait); | |
1983 | struct net_conf *nc; | |
1984 | int uncork, cork; | |
1985 | ||
1986 | dequeue_work_item(&connection->sender_work, work_list); | |
1987 | if (!list_empty(work_list)) | |
1988 | return; | |
1989 | ||
1990 | /* Still nothing to do? | |
1991 | * Maybe we still need to close the current epoch, | |
1992 | * even if no new requests are queued yet. | |
1993 | * | |
1994 | * Also, poke TCP, just in case. | |
1995 | * Then wait for new work (or signal). */ | |
1996 | rcu_read_lock(); | |
1997 | nc = rcu_dereference(connection->net_conf); | |
1998 | uncork = nc ? nc->tcp_cork : 0; | |
1999 | rcu_read_unlock(); | |
2000 | if (uncork) { | |
2001 | mutex_lock(&connection->data.mutex); | |
2002 | if (connection->data.socket) | |
2003 | drbd_tcp_uncork(connection->data.socket); | |
2004 | mutex_unlock(&connection->data.mutex); | |
2005 | } | |
2006 | ||
2007 | for (;;) { | |
2008 | int send_barrier; | |
2009 | prepare_to_wait(&connection->sender_work.q_wait, &wait, TASK_INTERRUPTIBLE); | |
0500813f | 2010 | spin_lock_irq(&connection->resource->req_lock); |
b6dd1a89 | 2011 | spin_lock(&connection->sender_work.q_lock); /* FIXME get rid of this one? */ |
bc317a9e LE |
2012 | /* dequeue single item only, |
2013 | * we still use drbd_queue_work_front() in some places */ | |
2014 | if (!list_empty(&connection->sender_work.q)) | |
4dd726f0 | 2015 | list_splice_tail_init(&connection->sender_work.q, work_list); |
b6dd1a89 LE |
2016 | spin_unlock(&connection->sender_work.q_lock); /* FIXME get rid of this one? */ |
2017 | if (!list_empty(work_list) || signal_pending(current)) { | |
0500813f | 2018 | spin_unlock_irq(&connection->resource->req_lock); |
b6dd1a89 LE |
2019 | break; |
2020 | } | |
f9c78128 LE |
2021 | |
2022 | /* We found nothing new to do, no to-be-communicated request, | |
2023 | * no other work item. We may still need to close the last | |
2024 | * epoch. Next incoming request epoch will be connection -> | |
2025 | * current transfer log epoch number. If that is different | |
2026 | * from the epoch of the last request we communicated, it is | |
2027 | * safe to send the epoch separating barrier now. | |
2028 | */ | |
2029 | send_barrier = | |
2030 | atomic_read(&connection->current_tle_nr) != | |
2031 | connection->send.current_epoch_nr; | |
0500813f | 2032 | spin_unlock_irq(&connection->resource->req_lock); |
f9c78128 LE |
2033 | |
2034 | if (send_barrier) | |
2035 | maybe_send_barrier(connection, | |
2036 | connection->send.current_epoch_nr + 1); | |
5ab7d2c0 | 2037 | |
e334f550 | 2038 | if (test_bit(DEVICE_WORK_PENDING, &connection->flags)) |
5ab7d2c0 LE |
2039 | break; |
2040 | ||
a80ca1ae LE |
2041 | /* drbd_send() may have called flush_signals() */ |
2042 | if (get_t_state(&connection->worker) != RUNNING) | |
2043 | break; | |
5ab7d2c0 | 2044 | |
b6dd1a89 LE |
2045 | schedule(); |
2046 | /* may be woken up for other things but new work, too, | |
2047 | * e.g. if the current epoch got closed. | |
2048 | * In which case we send the barrier above. */ | |
2049 | } | |
2050 | finish_wait(&connection->sender_work.q_wait, &wait); | |
2051 | ||
2052 | /* someone may have changed the config while we have been waiting above. */ | |
2053 | rcu_read_lock(); | |
2054 | nc = rcu_dereference(connection->net_conf); | |
2055 | cork = nc ? nc->tcp_cork : 0; | |
2056 | rcu_read_unlock(); | |
2057 | mutex_lock(&connection->data.mutex); | |
2058 | if (connection->data.socket) { | |
2059 | if (cork) | |
2060 | drbd_tcp_cork(connection->data.socket); | |
2061 | else if (!uncork) | |
2062 | drbd_tcp_uncork(connection->data.socket); | |
2063 | } | |
2064 | mutex_unlock(&connection->data.mutex); | |
2065 | } | |
2066 | ||
b411b363 PR |
2067 | int drbd_worker(struct drbd_thread *thi) |
2068 | { | |
bde89a9e | 2069 | struct drbd_connection *connection = thi->connection; |
6db7e50a | 2070 | struct drbd_work *w = NULL; |
c06ece6b | 2071 | struct drbd_peer_device *peer_device; |
b411b363 | 2072 | LIST_HEAD(work_list); |
8c0785a5 | 2073 | int vnr; |
b411b363 | 2074 | |
e77a0a5c | 2075 | while (get_t_state(thi) == RUNNING) { |
80822284 | 2076 | drbd_thread_current_set_cpu(thi); |
b411b363 | 2077 | |
8c0785a5 | 2078 | if (list_empty(&work_list)) |
bde89a9e | 2079 | wait_for_work(connection, &work_list); |
b411b363 | 2080 | |
e334f550 LE |
2081 | if (test_and_clear_bit(DEVICE_WORK_PENDING, &connection->flags)) |
2082 | do_unqueued_work(connection); | |
5ab7d2c0 | 2083 | |
8c0785a5 | 2084 | if (signal_pending(current)) { |
b411b363 | 2085 | flush_signals(current); |
19393e10 | 2086 | if (get_t_state(thi) == RUNNING) { |
1ec861eb | 2087 | drbd_warn(connection, "Worker got an unexpected signal\n"); |
b411b363 | 2088 | continue; |
19393e10 | 2089 | } |
b411b363 PR |
2090 | break; |
2091 | } | |
2092 | ||
e77a0a5c | 2093 | if (get_t_state(thi) != RUNNING) |
b411b363 | 2094 | break; |
b411b363 | 2095 | |
8c0785a5 | 2096 | while (!list_empty(&work_list)) { |
6db7e50a AG |
2097 | w = list_first_entry(&work_list, struct drbd_work, list); |
2098 | list_del_init(&w->list); | |
2099 | if (w->cb(w, connection->cstate < C_WF_REPORT_PARAMS) == 0) | |
8c0785a5 | 2100 | continue; |
bde89a9e AG |
2101 | if (connection->cstate >= C_WF_REPORT_PARAMS) |
2102 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); | |
b411b363 PR |
2103 | } |
2104 | } | |
b411b363 | 2105 | |
8c0785a5 | 2106 | do { |
e334f550 LE |
2107 | if (test_and_clear_bit(DEVICE_WORK_PENDING, &connection->flags)) |
2108 | do_unqueued_work(connection); | |
b411b363 | 2109 | while (!list_empty(&work_list)) { |
6db7e50a AG |
2110 | w = list_first_entry(&work_list, struct drbd_work, list); |
2111 | list_del_init(&w->list); | |
2112 | w->cb(w, 1); | |
b411b363 | 2113 | } |
bde89a9e | 2114 | dequeue_work_batch(&connection->sender_work, &work_list); |
e334f550 | 2115 | } while (!list_empty(&work_list) || test_bit(DEVICE_WORK_PENDING, &connection->flags)); |
b411b363 | 2116 | |
c141ebda | 2117 | rcu_read_lock(); |
c06ece6b AG |
2118 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
2119 | struct drbd_device *device = peer_device->device; | |
0b0ba1ef | 2120 | D_ASSERT(device, device->state.disk == D_DISKLESS && device->state.conn == C_STANDALONE); |
b30ab791 | 2121 | kref_get(&device->kref); |
c141ebda | 2122 | rcu_read_unlock(); |
b30ab791 | 2123 | drbd_device_cleanup(device); |
05a10ec7 | 2124 | kref_put(&device->kref, drbd_destroy_device); |
c141ebda | 2125 | rcu_read_lock(); |
0e29d163 | 2126 | } |
c141ebda | 2127 | rcu_read_unlock(); |
b411b363 PR |
2128 | |
2129 | return 0; | |
2130 | } |