Commit | Line | Data |
---|---|---|
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 | ||
24 | */ | |
25 | ||
b411b363 | 26 | #include <linux/module.h> |
b411b363 PR |
27 | #include <linux/drbd.h> |
28 | #include <linux/sched.h> | |
29 | #include <linux/smp_lock.h> | |
30 | #include <linux/wait.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/memcontrol.h> | |
33 | #include <linux/mm_inline.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/random.h> | |
b411b363 PR |
36 | #include <linux/string.h> |
37 | #include <linux/scatterlist.h> | |
38 | ||
39 | #include "drbd_int.h" | |
40 | #include "drbd_req.h" | |
b411b363 | 41 | |
b411b363 PR |
42 | static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel); |
43 | ||
44 | ||
45 | ||
46 | /* defined here: | |
47 | drbd_md_io_complete | |
45bb912b | 48 | drbd_endio_sec |
b411b363 PR |
49 | drbd_endio_pri |
50 | ||
51 | * more endio handlers: | |
52 | atodb_endio in drbd_actlog.c | |
53 | drbd_bm_async_io_complete in drbd_bitmap.c | |
54 | ||
55 | * For all these callbacks, note the following: | |
56 | * The callbacks will be called in irq context by the IDE drivers, | |
57 | * and in Softirqs/Tasklets/BH context by the SCSI drivers. | |
58 | * Try to get the locking right :) | |
59 | * | |
60 | */ | |
61 | ||
62 | ||
63 | /* About the global_state_lock | |
64 | Each state transition on an device holds a read lock. In case we have | |
65 | to evaluate the sync after dependencies, we grab a write lock, because | |
66 | we need stable states on all devices for that. */ | |
67 | rwlock_t global_state_lock; | |
68 | ||
69 | /* used for synchronous meta data and bitmap IO | |
70 | * submitted by drbd_md_sync_page_io() | |
71 | */ | |
72 | void drbd_md_io_complete(struct bio *bio, int error) | |
73 | { | |
74 | struct drbd_md_io *md_io; | |
75 | ||
76 | md_io = (struct drbd_md_io *)bio->bi_private; | |
77 | md_io->error = error; | |
78 | ||
b411b363 PR |
79 | complete(&md_io->event); |
80 | } | |
81 | ||
82 | /* reads on behalf of the partner, | |
83 | * "submitted" by the receiver | |
84 | */ | |
45bb912b | 85 | void drbd_endio_read_sec_final(struct drbd_epoch_entry *e) __releases(local) |
b411b363 PR |
86 | { |
87 | unsigned long flags = 0; | |
45bb912b | 88 | struct drbd_conf *mdev = e->mdev; |
b411b363 PR |
89 | |
90 | D_ASSERT(e->block_id != ID_VACANT); | |
91 | ||
b411b363 PR |
92 | spin_lock_irqsave(&mdev->req_lock, flags); |
93 | mdev->read_cnt += e->size >> 9; | |
94 | list_del(&e->w.list); | |
95 | if (list_empty(&mdev->read_ee)) | |
96 | wake_up(&mdev->ee_wait); | |
45bb912b LE |
97 | if (test_bit(__EE_WAS_ERROR, &e->flags)) |
98 | __drbd_chk_io_error(mdev, FALSE); | |
b411b363 PR |
99 | spin_unlock_irqrestore(&mdev->req_lock, flags); |
100 | ||
b411b363 PR |
101 | drbd_queue_work(&mdev->data.work, &e->w); |
102 | put_ldev(mdev); | |
b411b363 PR |
103 | } |
104 | ||
45bb912b LE |
105 | static int is_failed_barrier(int ee_flags) |
106 | { | |
107 | return (ee_flags & (EE_IS_BARRIER|EE_WAS_ERROR|EE_RESUBMITTED)) | |
108 | == (EE_IS_BARRIER|EE_WAS_ERROR); | |
109 | } | |
110 | ||
b411b363 | 111 | /* writes on behalf of the partner, or resync writes, |
45bb912b LE |
112 | * "submitted" by the receiver, final stage. */ |
113 | static void drbd_endio_write_sec_final(struct drbd_epoch_entry *e) __releases(local) | |
b411b363 PR |
114 | { |
115 | unsigned long flags = 0; | |
45bb912b | 116 | struct drbd_conf *mdev = e->mdev; |
b411b363 PR |
117 | sector_t e_sector; |
118 | int do_wake; | |
119 | int is_syncer_req; | |
120 | int do_al_complete_io; | |
b411b363 | 121 | |
45bb912b LE |
122 | /* if this is a failed barrier request, disable use of barriers, |
123 | * and schedule for resubmission */ | |
124 | if (is_failed_barrier(e->flags)) { | |
b411b363 PR |
125 | drbd_bump_write_ordering(mdev, WO_bdev_flush); |
126 | spin_lock_irqsave(&mdev->req_lock, flags); | |
127 | list_del(&e->w.list); | |
fc8ce194 | 128 | e->flags = (e->flags & ~EE_WAS_ERROR) | EE_RESUBMITTED; |
b411b363 PR |
129 | e->w.cb = w_e_reissue; |
130 | /* put_ldev actually happens below, once we come here again. */ | |
131 | __release(local); | |
132 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
133 | drbd_queue_work(&mdev->data.work, &e->w); | |
134 | return; | |
135 | } | |
136 | ||
137 | D_ASSERT(e->block_id != ID_VACANT); | |
138 | ||
b411b363 PR |
139 | /* after we moved e to done_ee, |
140 | * we may no longer access it, | |
141 | * it may be freed/reused already! | |
142 | * (as soon as we release the req_lock) */ | |
143 | e_sector = e->sector; | |
144 | do_al_complete_io = e->flags & EE_CALL_AL_COMPLETE_IO; | |
45bb912b | 145 | is_syncer_req = is_syncer_block_id(e->block_id); |
b411b363 | 146 | |
45bb912b LE |
147 | spin_lock_irqsave(&mdev->req_lock, flags); |
148 | mdev->writ_cnt += e->size >> 9; | |
b411b363 PR |
149 | list_del(&e->w.list); /* has been on active_ee or sync_ee */ |
150 | list_add_tail(&e->w.list, &mdev->done_ee); | |
151 | ||
b411b363 PR |
152 | /* No hlist_del_init(&e->colision) here, we did not send the Ack yet, |
153 | * neither did we wake possibly waiting conflicting requests. | |
154 | * done from "drbd_process_done_ee" within the appropriate w.cb | |
155 | * (e_end_block/e_end_resync_block) or from _drbd_clear_done_ee */ | |
156 | ||
157 | do_wake = is_syncer_req | |
158 | ? list_empty(&mdev->sync_ee) | |
159 | : list_empty(&mdev->active_ee); | |
160 | ||
45bb912b | 161 | if (test_bit(__EE_WAS_ERROR, &e->flags)) |
b411b363 PR |
162 | __drbd_chk_io_error(mdev, FALSE); |
163 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
164 | ||
165 | if (is_syncer_req) | |
166 | drbd_rs_complete_io(mdev, e_sector); | |
167 | ||
168 | if (do_wake) | |
169 | wake_up(&mdev->ee_wait); | |
170 | ||
171 | if (do_al_complete_io) | |
172 | drbd_al_complete_io(mdev, e_sector); | |
173 | ||
174 | wake_asender(mdev); | |
175 | put_ldev(mdev); | |
45bb912b | 176 | } |
b411b363 | 177 | |
45bb912b LE |
178 | /* writes on behalf of the partner, or resync writes, |
179 | * "submitted" by the receiver. | |
180 | */ | |
181 | void drbd_endio_sec(struct bio *bio, int error) | |
182 | { | |
183 | struct drbd_epoch_entry *e = bio->bi_private; | |
184 | struct drbd_conf *mdev = e->mdev; | |
185 | int uptodate = bio_flagged(bio, BIO_UPTODATE); | |
186 | int is_write = bio_data_dir(bio) == WRITE; | |
187 | ||
188 | if (error) | |
189 | dev_warn(DEV, "%s: error=%d s=%llus\n", | |
190 | is_write ? "write" : "read", error, | |
191 | (unsigned long long)e->sector); | |
192 | if (!error && !uptodate) { | |
193 | dev_warn(DEV, "%s: setting error to -EIO s=%llus\n", | |
194 | is_write ? "write" : "read", | |
195 | (unsigned long long)e->sector); | |
196 | /* strange behavior of some lower level drivers... | |
197 | * fail the request by clearing the uptodate flag, | |
198 | * but do not return any error?! */ | |
199 | error = -EIO; | |
200 | } | |
201 | ||
202 | if (error) | |
203 | set_bit(__EE_WAS_ERROR, &e->flags); | |
204 | ||
205 | bio_put(bio); /* no need for the bio anymore */ | |
206 | if (atomic_dec_and_test(&e->pending_bios)) { | |
207 | if (is_write) | |
208 | drbd_endio_write_sec_final(e); | |
209 | else | |
210 | drbd_endio_read_sec_final(e); | |
211 | } | |
b411b363 PR |
212 | } |
213 | ||
214 | /* read, readA or write requests on R_PRIMARY coming from drbd_make_request | |
215 | */ | |
216 | void drbd_endio_pri(struct bio *bio, int error) | |
217 | { | |
218 | unsigned long flags; | |
219 | struct drbd_request *req = bio->bi_private; | |
220 | struct drbd_conf *mdev = req->mdev; | |
221 | struct bio_and_error m; | |
222 | enum drbd_req_event what; | |
223 | int uptodate = bio_flagged(bio, BIO_UPTODATE); | |
224 | ||
b411b363 PR |
225 | if (!error && !uptodate) { |
226 | dev_warn(DEV, "p %s: setting error to -EIO\n", | |
227 | bio_data_dir(bio) == WRITE ? "write" : "read"); | |
228 | /* strange behavior of some lower level drivers... | |
229 | * fail the request by clearing the uptodate flag, | |
230 | * but do not return any error?! */ | |
231 | error = -EIO; | |
232 | } | |
233 | ||
b411b363 PR |
234 | /* to avoid recursion in __req_mod */ |
235 | if (unlikely(error)) { | |
236 | what = (bio_data_dir(bio) == WRITE) | |
237 | ? write_completed_with_error | |
5c3c7e64 | 238 | : (bio_rw(bio) == READ) |
b411b363 PR |
239 | ? read_completed_with_error |
240 | : read_ahead_completed_with_error; | |
241 | } else | |
242 | what = completed_ok; | |
243 | ||
244 | bio_put(req->private_bio); | |
245 | req->private_bio = ERR_PTR(error); | |
246 | ||
247 | spin_lock_irqsave(&mdev->req_lock, flags); | |
248 | __req_mod(req, what, &m); | |
249 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
250 | ||
251 | if (m.bio) | |
252 | complete_master_bio(mdev, &m); | |
253 | } | |
254 | ||
b411b363 PR |
255 | int w_read_retry_remote(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
256 | { | |
257 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
258 | ||
259 | /* We should not detach for read io-error, | |
260 | * but try to WRITE the P_DATA_REPLY to the failed location, | |
261 | * to give the disk the chance to relocate that block */ | |
262 | ||
263 | spin_lock_irq(&mdev->req_lock); | |
d255e5ff LE |
264 | if (cancel || mdev->state.pdsk != D_UP_TO_DATE) { |
265 | _req_mod(req, read_retry_remote_canceled); | |
b411b363 | 266 | spin_unlock_irq(&mdev->req_lock); |
b411b363 PR |
267 | return 1; |
268 | } | |
269 | spin_unlock_irq(&mdev->req_lock); | |
270 | ||
271 | return w_send_read_req(mdev, w, 0); | |
272 | } | |
273 | ||
274 | int w_resync_inactive(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
275 | { | |
276 | ERR_IF(cancel) return 1; | |
277 | dev_err(DEV, "resync inactive, but callback triggered??\n"); | |
278 | return 1; /* Simply ignore this! */ | |
279 | } | |
280 | ||
45bb912b LE |
281 | void drbd_csum_ee(struct drbd_conf *mdev, struct crypto_hash *tfm, struct drbd_epoch_entry *e, void *digest) |
282 | { | |
283 | struct hash_desc desc; | |
284 | struct scatterlist sg; | |
285 | struct page *page = e->pages; | |
286 | struct page *tmp; | |
287 | unsigned len; | |
288 | ||
289 | desc.tfm = tfm; | |
290 | desc.flags = 0; | |
291 | ||
292 | sg_init_table(&sg, 1); | |
293 | crypto_hash_init(&desc); | |
294 | ||
295 | while ((tmp = page_chain_next(page))) { | |
296 | /* all but the last page will be fully used */ | |
297 | sg_set_page(&sg, page, PAGE_SIZE, 0); | |
298 | crypto_hash_update(&desc, &sg, sg.length); | |
299 | page = tmp; | |
300 | } | |
301 | /* and now the last, possibly only partially used page */ | |
302 | len = e->size & (PAGE_SIZE - 1); | |
303 | sg_set_page(&sg, page, len ?: PAGE_SIZE, 0); | |
304 | crypto_hash_update(&desc, &sg, sg.length); | |
305 | crypto_hash_final(&desc, digest); | |
306 | } | |
307 | ||
308 | void drbd_csum_bio(struct drbd_conf *mdev, struct crypto_hash *tfm, struct bio *bio, void *digest) | |
b411b363 PR |
309 | { |
310 | struct hash_desc desc; | |
311 | struct scatterlist sg; | |
312 | struct bio_vec *bvec; | |
313 | int i; | |
314 | ||
315 | desc.tfm = tfm; | |
316 | desc.flags = 0; | |
317 | ||
318 | sg_init_table(&sg, 1); | |
319 | crypto_hash_init(&desc); | |
320 | ||
321 | __bio_for_each_segment(bvec, bio, i, 0) { | |
322 | sg_set_page(&sg, bvec->bv_page, bvec->bv_len, bvec->bv_offset); | |
323 | crypto_hash_update(&desc, &sg, sg.length); | |
324 | } | |
325 | crypto_hash_final(&desc, digest); | |
326 | } | |
327 | ||
328 | static int w_e_send_csum(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
329 | { | |
330 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
331 | int digest_size; | |
332 | void *digest; | |
333 | int ok; | |
334 | ||
335 | D_ASSERT(e->block_id == DRBD_MAGIC + 0xbeef); | |
336 | ||
337 | if (unlikely(cancel)) { | |
338 | drbd_free_ee(mdev, e); | |
339 | return 1; | |
340 | } | |
341 | ||
45bb912b | 342 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
343 | digest_size = crypto_hash_digestsize(mdev->csums_tfm); |
344 | digest = kmalloc(digest_size, GFP_NOIO); | |
345 | if (digest) { | |
45bb912b | 346 | drbd_csum_ee(mdev, mdev->csums_tfm, e, digest); |
b411b363 PR |
347 | |
348 | inc_rs_pending(mdev); | |
349 | ok = drbd_send_drequest_csum(mdev, | |
350 | e->sector, | |
351 | e->size, | |
352 | digest, | |
353 | digest_size, | |
354 | P_CSUM_RS_REQUEST); | |
355 | kfree(digest); | |
356 | } else { | |
357 | dev_err(DEV, "kmalloc() of digest failed.\n"); | |
358 | ok = 0; | |
359 | } | |
360 | } else | |
361 | ok = 1; | |
362 | ||
363 | drbd_free_ee(mdev, e); | |
364 | ||
365 | if (unlikely(!ok)) | |
366 | dev_err(DEV, "drbd_send_drequest(..., csum) failed\n"); | |
367 | return ok; | |
368 | } | |
369 | ||
370 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
371 | ||
372 | static int read_for_csum(struct drbd_conf *mdev, sector_t sector, int size) | |
373 | { | |
374 | struct drbd_epoch_entry *e; | |
375 | ||
376 | if (!get_ldev(mdev)) | |
377 | return 0; | |
378 | ||
379 | /* GFP_TRY, because if there is no memory available right now, this may | |
380 | * be rescheduled for later. It is "only" background resync, after all. */ | |
381 | e = drbd_alloc_ee(mdev, DRBD_MAGIC+0xbeef, sector, size, GFP_TRY); | |
45bb912b LE |
382 | if (!e) |
383 | goto fail; | |
b411b363 PR |
384 | |
385 | spin_lock_irq(&mdev->req_lock); | |
386 | list_add(&e->w.list, &mdev->read_ee); | |
387 | spin_unlock_irq(&mdev->req_lock); | |
388 | ||
b411b363 | 389 | e->w.cb = w_e_send_csum; |
45bb912b LE |
390 | if (drbd_submit_ee(mdev, e, READ, DRBD_FAULT_RS_RD) == 0) |
391 | return 1; | |
b411b363 | 392 | |
45bb912b LE |
393 | drbd_free_ee(mdev, e); |
394 | fail: | |
395 | put_ldev(mdev); | |
396 | return 2; | |
b411b363 PR |
397 | } |
398 | ||
399 | void resync_timer_fn(unsigned long data) | |
400 | { | |
401 | unsigned long flags; | |
402 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
403 | int queue; | |
404 | ||
405 | spin_lock_irqsave(&mdev->req_lock, flags); | |
406 | ||
407 | if (likely(!test_and_clear_bit(STOP_SYNC_TIMER, &mdev->flags))) { | |
408 | queue = 1; | |
409 | if (mdev->state.conn == C_VERIFY_S) | |
410 | mdev->resync_work.cb = w_make_ov_request; | |
411 | else | |
412 | mdev->resync_work.cb = w_make_resync_request; | |
413 | } else { | |
414 | queue = 0; | |
415 | mdev->resync_work.cb = w_resync_inactive; | |
416 | } | |
417 | ||
418 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
419 | ||
420 | /* harmless race: list_empty outside data.work.q_lock */ | |
421 | if (list_empty(&mdev->resync_work.list) && queue) | |
422 | drbd_queue_work(&mdev->data.work, &mdev->resync_work); | |
423 | } | |
424 | ||
425 | int w_make_resync_request(struct drbd_conf *mdev, | |
426 | struct drbd_work *w, int cancel) | |
427 | { | |
428 | unsigned long bit; | |
429 | sector_t sector; | |
430 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
bb3d000c | 431 | int max_segment_size; |
b411b363 PR |
432 | int number, i, size, pe, mx; |
433 | int align, queued, sndbuf; | |
434 | ||
435 | if (unlikely(cancel)) | |
436 | return 1; | |
437 | ||
438 | if (unlikely(mdev->state.conn < C_CONNECTED)) { | |
439 | dev_err(DEV, "Confused in w_make_resync_request()! cstate < Connected"); | |
440 | return 0; | |
441 | } | |
442 | ||
443 | if (mdev->state.conn != C_SYNC_TARGET) | |
444 | dev_err(DEV, "%s in w_make_resync_request\n", | |
445 | drbd_conn_str(mdev->state.conn)); | |
446 | ||
447 | if (!get_ldev(mdev)) { | |
448 | /* Since we only need to access mdev->rsync a | |
449 | get_ldev_if_state(mdev,D_FAILED) would be sufficient, but | |
450 | to continue resync with a broken disk makes no sense at | |
451 | all */ | |
452 | dev_err(DEV, "Disk broke down during resync!\n"); | |
453 | mdev->resync_work.cb = w_resync_inactive; | |
454 | return 1; | |
455 | } | |
456 | ||
bb3d000c LE |
457 | /* starting with drbd 8.3.8, we can handle multi-bio EEs, |
458 | * if it should be necessary */ | |
459 | max_segment_size = mdev->agreed_pro_version < 94 ? | |
460 | queue_max_segment_size(mdev->rq_queue) : DRBD_MAX_SEGMENT_SIZE; | |
461 | ||
e7f52dfb | 462 | number = SLEEP_TIME * mdev->sync_conf.rate / ((BM_BLOCK_SIZE / 1024) * HZ); |
b411b363 PR |
463 | pe = atomic_read(&mdev->rs_pending_cnt); |
464 | ||
465 | mutex_lock(&mdev->data.mutex); | |
466 | if (mdev->data.socket) | |
467 | mx = mdev->data.socket->sk->sk_rcvbuf / sizeof(struct p_block_req); | |
468 | else | |
469 | mx = 1; | |
470 | mutex_unlock(&mdev->data.mutex); | |
471 | ||
472 | /* For resync rates >160MB/sec, allow more pending RS requests */ | |
473 | if (number > mx) | |
474 | mx = number; | |
475 | ||
476 | /* Limit the number of pending RS requests to no more than the peer's receive buffer */ | |
477 | if ((pe + number) > mx) { | |
478 | number = mx - pe; | |
479 | } | |
480 | ||
481 | for (i = 0; i < number; i++) { | |
482 | /* Stop generating RS requests, when half of the send buffer is filled */ | |
483 | mutex_lock(&mdev->data.mutex); | |
484 | if (mdev->data.socket) { | |
485 | queued = mdev->data.socket->sk->sk_wmem_queued; | |
486 | sndbuf = mdev->data.socket->sk->sk_sndbuf; | |
487 | } else { | |
488 | queued = 1; | |
489 | sndbuf = 0; | |
490 | } | |
491 | mutex_unlock(&mdev->data.mutex); | |
492 | if (queued > sndbuf / 2) | |
493 | goto requeue; | |
494 | ||
495 | next_sector: | |
496 | size = BM_BLOCK_SIZE; | |
497 | bit = drbd_bm_find_next(mdev, mdev->bm_resync_fo); | |
498 | ||
499 | if (bit == -1UL) { | |
500 | mdev->bm_resync_fo = drbd_bm_bits(mdev); | |
501 | mdev->resync_work.cb = w_resync_inactive; | |
502 | put_ldev(mdev); | |
503 | return 1; | |
504 | } | |
505 | ||
506 | sector = BM_BIT_TO_SECT(bit); | |
507 | ||
508 | if (drbd_try_rs_begin_io(mdev, sector)) { | |
509 | mdev->bm_resync_fo = bit; | |
510 | goto requeue; | |
511 | } | |
512 | mdev->bm_resync_fo = bit + 1; | |
513 | ||
514 | if (unlikely(drbd_bm_test_bit(mdev, bit) == 0)) { | |
515 | drbd_rs_complete_io(mdev, sector); | |
516 | goto next_sector; | |
517 | } | |
518 | ||
519 | #if DRBD_MAX_SEGMENT_SIZE > BM_BLOCK_SIZE | |
520 | /* try to find some adjacent bits. | |
521 | * we stop if we have already the maximum req size. | |
522 | * | |
523 | * Additionally always align bigger requests, in order to | |
524 | * be prepared for all stripe sizes of software RAIDs. | |
b411b363 PR |
525 | */ |
526 | align = 1; | |
527 | for (;;) { | |
528 | if (size + BM_BLOCK_SIZE > max_segment_size) | |
529 | break; | |
530 | ||
531 | /* Be always aligned */ | |
532 | if (sector & ((1<<(align+3))-1)) | |
533 | break; | |
534 | ||
535 | /* do not cross extent boundaries */ | |
536 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) | |
537 | break; | |
538 | /* now, is it actually dirty, after all? | |
539 | * caution, drbd_bm_test_bit is tri-state for some | |
540 | * obscure reason; ( b == 0 ) would get the out-of-band | |
541 | * only accidentally right because of the "oddly sized" | |
542 | * adjustment below */ | |
543 | if (drbd_bm_test_bit(mdev, bit+1) != 1) | |
544 | break; | |
545 | bit++; | |
546 | size += BM_BLOCK_SIZE; | |
547 | if ((BM_BLOCK_SIZE << align) <= size) | |
548 | align++; | |
549 | i++; | |
550 | } | |
551 | /* if we merged some, | |
552 | * reset the offset to start the next drbd_bm_find_next from */ | |
553 | if (size > BM_BLOCK_SIZE) | |
554 | mdev->bm_resync_fo = bit + 1; | |
555 | #endif | |
556 | ||
557 | /* adjust very last sectors, in case we are oddly sized */ | |
558 | if (sector + (size>>9) > capacity) | |
559 | size = (capacity-sector)<<9; | |
560 | if (mdev->agreed_pro_version >= 89 && mdev->csums_tfm) { | |
561 | switch (read_for_csum(mdev, sector, size)) { | |
562 | case 0: /* Disk failure*/ | |
563 | put_ldev(mdev); | |
564 | return 0; | |
565 | case 2: /* Allocation failed */ | |
566 | drbd_rs_complete_io(mdev, sector); | |
567 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
568 | goto requeue; | |
569 | /* case 1: everything ok */ | |
570 | } | |
571 | } else { | |
572 | inc_rs_pending(mdev); | |
573 | if (!drbd_send_drequest(mdev, P_RS_DATA_REQUEST, | |
574 | sector, size, ID_SYNCER)) { | |
575 | dev_err(DEV, "drbd_send_drequest() failed, aborting...\n"); | |
576 | dec_rs_pending(mdev); | |
577 | put_ldev(mdev); | |
578 | return 0; | |
579 | } | |
580 | } | |
581 | } | |
582 | ||
583 | if (mdev->bm_resync_fo >= drbd_bm_bits(mdev)) { | |
584 | /* last syncer _request_ was sent, | |
585 | * but the P_RS_DATA_REPLY not yet received. sync will end (and | |
586 | * next sync group will resume), as soon as we receive the last | |
587 | * resync data block, and the last bit is cleared. | |
588 | * until then resync "work" is "inactive" ... | |
589 | */ | |
590 | mdev->resync_work.cb = w_resync_inactive; | |
591 | put_ldev(mdev); | |
592 | return 1; | |
593 | } | |
594 | ||
595 | requeue: | |
596 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); | |
597 | put_ldev(mdev); | |
598 | return 1; | |
599 | } | |
600 | ||
601 | static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
602 | { | |
603 | int number, i, size; | |
604 | sector_t sector; | |
605 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
606 | ||
607 | if (unlikely(cancel)) | |
608 | return 1; | |
609 | ||
610 | if (unlikely(mdev->state.conn < C_CONNECTED)) { | |
611 | dev_err(DEV, "Confused in w_make_ov_request()! cstate < Connected"); | |
612 | return 0; | |
613 | } | |
614 | ||
615 | number = SLEEP_TIME*mdev->sync_conf.rate / ((BM_BLOCK_SIZE/1024)*HZ); | |
616 | if (atomic_read(&mdev->rs_pending_cnt) > number) | |
617 | goto requeue; | |
618 | ||
619 | number -= atomic_read(&mdev->rs_pending_cnt); | |
620 | ||
621 | sector = mdev->ov_position; | |
622 | for (i = 0; i < number; i++) { | |
623 | if (sector >= capacity) { | |
624 | mdev->resync_work.cb = w_resync_inactive; | |
625 | return 1; | |
626 | } | |
627 | ||
628 | size = BM_BLOCK_SIZE; | |
629 | ||
630 | if (drbd_try_rs_begin_io(mdev, sector)) { | |
631 | mdev->ov_position = sector; | |
632 | goto requeue; | |
633 | } | |
634 | ||
635 | if (sector + (size>>9) > capacity) | |
636 | size = (capacity-sector)<<9; | |
637 | ||
638 | inc_rs_pending(mdev); | |
639 | if (!drbd_send_ov_request(mdev, sector, size)) { | |
640 | dec_rs_pending(mdev); | |
641 | return 0; | |
642 | } | |
643 | sector += BM_SECT_PER_BIT; | |
644 | } | |
645 | mdev->ov_position = sector; | |
646 | ||
647 | requeue: | |
648 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); | |
649 | return 1; | |
650 | } | |
651 | ||
652 | ||
653 | int w_ov_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
654 | { | |
655 | kfree(w); | |
656 | ov_oos_print(mdev); | |
657 | drbd_resync_finished(mdev); | |
658 | ||
659 | return 1; | |
660 | } | |
661 | ||
662 | static int w_resync_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
663 | { | |
664 | kfree(w); | |
665 | ||
666 | drbd_resync_finished(mdev); | |
667 | ||
668 | return 1; | |
669 | } | |
670 | ||
671 | int drbd_resync_finished(struct drbd_conf *mdev) | |
672 | { | |
673 | unsigned long db, dt, dbdt; | |
674 | unsigned long n_oos; | |
675 | union drbd_state os, ns; | |
676 | struct drbd_work *w; | |
677 | char *khelper_cmd = NULL; | |
678 | ||
679 | /* Remove all elements from the resync LRU. Since future actions | |
680 | * might set bits in the (main) bitmap, then the entries in the | |
681 | * resync LRU would be wrong. */ | |
682 | if (drbd_rs_del_all(mdev)) { | |
683 | /* In case this is not possible now, most probably because | |
684 | * there are P_RS_DATA_REPLY Packets lingering on the worker's | |
685 | * queue (or even the read operations for those packets | |
686 | * is not finished by now). Retry in 100ms. */ | |
687 | ||
688 | drbd_kick_lo(mdev); | |
689 | __set_current_state(TASK_INTERRUPTIBLE); | |
690 | schedule_timeout(HZ / 10); | |
691 | w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC); | |
692 | if (w) { | |
693 | w->cb = w_resync_finished; | |
694 | drbd_queue_work(&mdev->data.work, w); | |
695 | return 1; | |
696 | } | |
697 | dev_err(DEV, "Warn failed to drbd_rs_del_all() and to kmalloc(w).\n"); | |
698 | } | |
699 | ||
700 | dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ; | |
701 | if (dt <= 0) | |
702 | dt = 1; | |
703 | db = mdev->rs_total; | |
704 | dbdt = Bit2KB(db/dt); | |
705 | mdev->rs_paused /= HZ; | |
706 | ||
707 | if (!get_ldev(mdev)) | |
708 | goto out; | |
709 | ||
710 | spin_lock_irq(&mdev->req_lock); | |
711 | os = mdev->state; | |
712 | ||
713 | /* This protects us against multiple calls (that can happen in the presence | |
714 | of application IO), and against connectivity loss just before we arrive here. */ | |
715 | if (os.conn <= C_CONNECTED) | |
716 | goto out_unlock; | |
717 | ||
718 | ns = os; | |
719 | ns.conn = C_CONNECTED; | |
720 | ||
721 | dev_info(DEV, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", | |
722 | (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) ? | |
723 | "Online verify " : "Resync", | |
724 | dt + mdev->rs_paused, mdev->rs_paused, dbdt); | |
725 | ||
726 | n_oos = drbd_bm_total_weight(mdev); | |
727 | ||
728 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { | |
729 | if (n_oos) { | |
730 | dev_alert(DEV, "Online verify found %lu %dk block out of sync!\n", | |
731 | n_oos, Bit2KB(1)); | |
732 | khelper_cmd = "out-of-sync"; | |
733 | } | |
734 | } else { | |
735 | D_ASSERT((n_oos - mdev->rs_failed) == 0); | |
736 | ||
737 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) | |
738 | khelper_cmd = "after-resync-target"; | |
739 | ||
740 | if (mdev->csums_tfm && mdev->rs_total) { | |
741 | const unsigned long s = mdev->rs_same_csum; | |
742 | const unsigned long t = mdev->rs_total; | |
743 | const int ratio = | |
744 | (t == 0) ? 0 : | |
745 | (t < 100000) ? ((s*100)/t) : (s/(t/100)); | |
746 | dev_info(DEV, "%u %% had equal check sums, eliminated: %luK; " | |
747 | "transferred %luK total %luK\n", | |
748 | ratio, | |
749 | Bit2KB(mdev->rs_same_csum), | |
750 | Bit2KB(mdev->rs_total - mdev->rs_same_csum), | |
751 | Bit2KB(mdev->rs_total)); | |
752 | } | |
753 | } | |
754 | ||
755 | if (mdev->rs_failed) { | |
756 | dev_info(DEV, " %lu failed blocks\n", mdev->rs_failed); | |
757 | ||
758 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
759 | ns.disk = D_INCONSISTENT; | |
760 | ns.pdsk = D_UP_TO_DATE; | |
761 | } else { | |
762 | ns.disk = D_UP_TO_DATE; | |
763 | ns.pdsk = D_INCONSISTENT; | |
764 | } | |
765 | } else { | |
766 | ns.disk = D_UP_TO_DATE; | |
767 | ns.pdsk = D_UP_TO_DATE; | |
768 | ||
769 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
770 | if (mdev->p_uuid) { | |
771 | int i; | |
772 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) | |
773 | _drbd_uuid_set(mdev, i, mdev->p_uuid[i]); | |
774 | drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_CURRENT]); | |
775 | _drbd_uuid_set(mdev, UI_CURRENT, mdev->p_uuid[UI_CURRENT]); | |
776 | } else { | |
777 | dev_err(DEV, "mdev->p_uuid is NULL! BUG\n"); | |
778 | } | |
779 | } | |
780 | ||
781 | drbd_uuid_set_bm(mdev, 0UL); | |
782 | ||
783 | if (mdev->p_uuid) { | |
784 | /* Now the two UUID sets are equal, update what we | |
785 | * know of the peer. */ | |
786 | int i; | |
787 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) | |
788 | mdev->p_uuid[i] = mdev->ldev->md.uuid[i]; | |
789 | } | |
790 | } | |
791 | ||
792 | _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
793 | out_unlock: | |
794 | spin_unlock_irq(&mdev->req_lock); | |
795 | put_ldev(mdev); | |
796 | out: | |
797 | mdev->rs_total = 0; | |
798 | mdev->rs_failed = 0; | |
799 | mdev->rs_paused = 0; | |
800 | mdev->ov_start_sector = 0; | |
801 | ||
802 | if (test_and_clear_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags)) { | |
803 | dev_warn(DEV, "Writing the whole bitmap, due to failed kmalloc\n"); | |
804 | drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, "write from resync_finished"); | |
805 | } | |
806 | ||
807 | if (khelper_cmd) | |
808 | drbd_khelper(mdev, khelper_cmd); | |
809 | ||
810 | return 1; | |
811 | } | |
812 | ||
813 | /* helper */ | |
814 | static void move_to_net_ee_or_free(struct drbd_conf *mdev, struct drbd_epoch_entry *e) | |
815 | { | |
45bb912b | 816 | if (drbd_ee_has_active_page(e)) { |
b411b363 PR |
817 | /* This might happen if sendpage() has not finished */ |
818 | spin_lock_irq(&mdev->req_lock); | |
819 | list_add_tail(&e->w.list, &mdev->net_ee); | |
820 | spin_unlock_irq(&mdev->req_lock); | |
821 | } else | |
822 | drbd_free_ee(mdev, e); | |
823 | } | |
824 | ||
825 | /** | |
826 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST | |
827 | * @mdev: DRBD device. | |
828 | * @w: work object. | |
829 | * @cancel: The connection will be closed anyways | |
830 | */ | |
831 | int w_e_end_data_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
832 | { | |
833 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
834 | int ok; | |
835 | ||
836 | if (unlikely(cancel)) { | |
837 | drbd_free_ee(mdev, e); | |
838 | dec_unacked(mdev); | |
839 | return 1; | |
840 | } | |
841 | ||
45bb912b | 842 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
843 | ok = drbd_send_block(mdev, P_DATA_REPLY, e); |
844 | } else { | |
845 | if (__ratelimit(&drbd_ratelimit_state)) | |
846 | dev_err(DEV, "Sending NegDReply. sector=%llus.\n", | |
847 | (unsigned long long)e->sector); | |
848 | ||
849 | ok = drbd_send_ack(mdev, P_NEG_DREPLY, e); | |
850 | } | |
851 | ||
852 | dec_unacked(mdev); | |
853 | ||
854 | move_to_net_ee_or_free(mdev, e); | |
855 | ||
856 | if (unlikely(!ok)) | |
857 | dev_err(DEV, "drbd_send_block() failed\n"); | |
858 | return ok; | |
859 | } | |
860 | ||
861 | /** | |
862 | * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUESTRS | |
863 | * @mdev: DRBD device. | |
864 | * @w: work object. | |
865 | * @cancel: The connection will be closed anyways | |
866 | */ | |
867 | int w_e_end_rsdata_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
868 | { | |
869 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
870 | int ok; | |
871 | ||
872 | if (unlikely(cancel)) { | |
873 | drbd_free_ee(mdev, e); | |
874 | dec_unacked(mdev); | |
875 | return 1; | |
876 | } | |
877 | ||
878 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
879 | drbd_rs_complete_io(mdev, e->sector); | |
880 | put_ldev(mdev); | |
881 | } | |
882 | ||
45bb912b | 883 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
884 | if (likely(mdev->state.pdsk >= D_INCONSISTENT)) { |
885 | inc_rs_pending(mdev); | |
886 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); | |
887 | } else { | |
888 | if (__ratelimit(&drbd_ratelimit_state)) | |
889 | dev_err(DEV, "Not sending RSDataReply, " | |
890 | "partner DISKLESS!\n"); | |
891 | ok = 1; | |
892 | } | |
893 | } else { | |
894 | if (__ratelimit(&drbd_ratelimit_state)) | |
895 | dev_err(DEV, "Sending NegRSDReply. sector %llus.\n", | |
896 | (unsigned long long)e->sector); | |
897 | ||
898 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); | |
899 | ||
900 | /* update resync data with failure */ | |
901 | drbd_rs_failed_io(mdev, e->sector, e->size); | |
902 | } | |
903 | ||
904 | dec_unacked(mdev); | |
905 | ||
906 | move_to_net_ee_or_free(mdev, e); | |
907 | ||
908 | if (unlikely(!ok)) | |
909 | dev_err(DEV, "drbd_send_block() failed\n"); | |
910 | return ok; | |
911 | } | |
912 | ||
913 | int w_e_end_csum_rs_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
914 | { | |
915 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
916 | struct digest_info *di; | |
917 | int digest_size; | |
918 | void *digest = NULL; | |
919 | int ok, eq = 0; | |
920 | ||
921 | if (unlikely(cancel)) { | |
922 | drbd_free_ee(mdev, e); | |
923 | dec_unacked(mdev); | |
924 | return 1; | |
925 | } | |
926 | ||
927 | drbd_rs_complete_io(mdev, e->sector); | |
928 | ||
929 | di = (struct digest_info *)(unsigned long)e->block_id; | |
930 | ||
45bb912b | 931 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
932 | /* quick hack to try to avoid a race against reconfiguration. |
933 | * a real fix would be much more involved, | |
934 | * introducing more locking mechanisms */ | |
935 | if (mdev->csums_tfm) { | |
936 | digest_size = crypto_hash_digestsize(mdev->csums_tfm); | |
937 | D_ASSERT(digest_size == di->digest_size); | |
938 | digest = kmalloc(digest_size, GFP_NOIO); | |
939 | } | |
940 | if (digest) { | |
45bb912b | 941 | drbd_csum_ee(mdev, mdev->csums_tfm, e, digest); |
b411b363 PR |
942 | eq = !memcmp(digest, di->digest, digest_size); |
943 | kfree(digest); | |
944 | } | |
945 | ||
946 | if (eq) { | |
947 | drbd_set_in_sync(mdev, e->sector, e->size); | |
676396d5 LE |
948 | /* rs_same_csums unit is BM_BLOCK_SIZE */ |
949 | mdev->rs_same_csum += e->size >> BM_BLOCK_SHIFT; | |
b411b363 PR |
950 | ok = drbd_send_ack(mdev, P_RS_IS_IN_SYNC, e); |
951 | } else { | |
952 | inc_rs_pending(mdev); | |
953 | e->block_id = ID_SYNCER; | |
954 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); | |
955 | } | |
956 | } else { | |
957 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); | |
958 | if (__ratelimit(&drbd_ratelimit_state)) | |
959 | dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); | |
960 | } | |
961 | ||
962 | dec_unacked(mdev); | |
963 | ||
964 | kfree(di); | |
965 | ||
966 | move_to_net_ee_or_free(mdev, e); | |
967 | ||
968 | if (unlikely(!ok)) | |
969 | dev_err(DEV, "drbd_send_block/ack() failed\n"); | |
970 | return ok; | |
971 | } | |
972 | ||
973 | int w_e_end_ov_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
974 | { | |
975 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
976 | int digest_size; | |
977 | void *digest; | |
978 | int ok = 1; | |
979 | ||
980 | if (unlikely(cancel)) | |
981 | goto out; | |
982 | ||
45bb912b | 983 | if (unlikely((e->flags & EE_WAS_ERROR) != 0)) |
b411b363 PR |
984 | goto out; |
985 | ||
986 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); | |
987 | /* FIXME if this allocation fails, online verify will not terminate! */ | |
988 | digest = kmalloc(digest_size, GFP_NOIO); | |
989 | if (digest) { | |
45bb912b | 990 | drbd_csum_ee(mdev, mdev->verify_tfm, e, digest); |
b411b363 PR |
991 | inc_rs_pending(mdev); |
992 | ok = drbd_send_drequest_csum(mdev, e->sector, e->size, | |
993 | digest, digest_size, P_OV_REPLY); | |
994 | if (!ok) | |
995 | dec_rs_pending(mdev); | |
996 | kfree(digest); | |
997 | } | |
998 | ||
999 | out: | |
1000 | drbd_free_ee(mdev, e); | |
1001 | ||
1002 | dec_unacked(mdev); | |
1003 | ||
1004 | return ok; | |
1005 | } | |
1006 | ||
1007 | void drbd_ov_oos_found(struct drbd_conf *mdev, sector_t sector, int size) | |
1008 | { | |
1009 | if (mdev->ov_last_oos_start + mdev->ov_last_oos_size == sector) { | |
1010 | mdev->ov_last_oos_size += size>>9; | |
1011 | } else { | |
1012 | mdev->ov_last_oos_start = sector; | |
1013 | mdev->ov_last_oos_size = size>>9; | |
1014 | } | |
1015 | drbd_set_out_of_sync(mdev, sector, size); | |
1016 | set_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags); | |
1017 | } | |
1018 | ||
1019 | int w_e_end_ov_reply(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1020 | { | |
1021 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
1022 | struct digest_info *di; | |
1023 | int digest_size; | |
1024 | void *digest; | |
1025 | int ok, eq = 0; | |
1026 | ||
1027 | if (unlikely(cancel)) { | |
1028 | drbd_free_ee(mdev, e); | |
1029 | dec_unacked(mdev); | |
1030 | return 1; | |
1031 | } | |
1032 | ||
1033 | /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all | |
1034 | * the resync lru has been cleaned up already */ | |
1035 | drbd_rs_complete_io(mdev, e->sector); | |
1036 | ||
1037 | di = (struct digest_info *)(unsigned long)e->block_id; | |
1038 | ||
45bb912b | 1039 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1040 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); |
1041 | digest = kmalloc(digest_size, GFP_NOIO); | |
1042 | if (digest) { | |
45bb912b | 1043 | drbd_csum_ee(mdev, mdev->verify_tfm, e, digest); |
b411b363 PR |
1044 | |
1045 | D_ASSERT(digest_size == di->digest_size); | |
1046 | eq = !memcmp(digest, di->digest, digest_size); | |
1047 | kfree(digest); | |
1048 | } | |
1049 | } else { | |
1050 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); | |
1051 | if (__ratelimit(&drbd_ratelimit_state)) | |
1052 | dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); | |
1053 | } | |
1054 | ||
1055 | dec_unacked(mdev); | |
1056 | ||
1057 | kfree(di); | |
1058 | ||
1059 | if (!eq) | |
1060 | drbd_ov_oos_found(mdev, e->sector, e->size); | |
1061 | else | |
1062 | ov_oos_print(mdev); | |
1063 | ||
1064 | ok = drbd_send_ack_ex(mdev, P_OV_RESULT, e->sector, e->size, | |
1065 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); | |
1066 | ||
1067 | drbd_free_ee(mdev, e); | |
1068 | ||
1069 | if (--mdev->ov_left == 0) { | |
1070 | ov_oos_print(mdev); | |
1071 | drbd_resync_finished(mdev); | |
1072 | } | |
1073 | ||
1074 | return ok; | |
1075 | } | |
1076 | ||
1077 | int w_prev_work_done(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1078 | { | |
1079 | struct drbd_wq_barrier *b = container_of(w, struct drbd_wq_barrier, w); | |
1080 | complete(&b->done); | |
1081 | return 1; | |
1082 | } | |
1083 | ||
1084 | int w_send_barrier(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1085 | { | |
1086 | struct drbd_tl_epoch *b = container_of(w, struct drbd_tl_epoch, w); | |
1087 | struct p_barrier *p = &mdev->data.sbuf.barrier; | |
1088 | int ok = 1; | |
1089 | ||
1090 | /* really avoid racing with tl_clear. w.cb may have been referenced | |
1091 | * just before it was reassigned and re-queued, so double check that. | |
1092 | * actually, this race was harmless, since we only try to send the | |
1093 | * barrier packet here, and otherwise do nothing with the object. | |
1094 | * but compare with the head of w_clear_epoch */ | |
1095 | spin_lock_irq(&mdev->req_lock); | |
1096 | if (w->cb != w_send_barrier || mdev->state.conn < C_CONNECTED) | |
1097 | cancel = 1; | |
1098 | spin_unlock_irq(&mdev->req_lock); | |
1099 | if (cancel) | |
1100 | return 1; | |
1101 | ||
1102 | if (!drbd_get_data_sock(mdev)) | |
1103 | return 0; | |
1104 | p->barrier = b->br_number; | |
1105 | /* inc_ap_pending was done where this was queued. | |
1106 | * dec_ap_pending will be done in got_BarrierAck | |
1107 | * or (on connection loss) in w_clear_epoch. */ | |
1108 | ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BARRIER, | |
1109 | (struct p_header *)p, sizeof(*p), 0); | |
1110 | drbd_put_data_sock(mdev); | |
1111 | ||
1112 | return ok; | |
1113 | } | |
1114 | ||
1115 | int w_send_write_hint(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1116 | { | |
1117 | if (cancel) | |
1118 | return 1; | |
1119 | return drbd_send_short_cmd(mdev, P_UNPLUG_REMOTE); | |
1120 | } | |
1121 | ||
1122 | /** | |
1123 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request | |
1124 | * @mdev: DRBD device. | |
1125 | * @w: work object. | |
1126 | * @cancel: The connection will be closed anyways | |
1127 | */ | |
1128 | int w_send_dblock(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1129 | { | |
1130 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1131 | int ok; | |
1132 | ||
1133 | if (unlikely(cancel)) { | |
1134 | req_mod(req, send_canceled); | |
1135 | return 1; | |
1136 | } | |
1137 | ||
1138 | ok = drbd_send_dblock(mdev, req); | |
1139 | req_mod(req, ok ? handed_over_to_network : send_failed); | |
1140 | ||
1141 | return ok; | |
1142 | } | |
1143 | ||
1144 | /** | |
1145 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet | |
1146 | * @mdev: DRBD device. | |
1147 | * @w: work object. | |
1148 | * @cancel: The connection will be closed anyways | |
1149 | */ | |
1150 | int w_send_read_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1151 | { | |
1152 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1153 | int ok; | |
1154 | ||
1155 | if (unlikely(cancel)) { | |
1156 | req_mod(req, send_canceled); | |
1157 | return 1; | |
1158 | } | |
1159 | ||
1160 | ok = drbd_send_drequest(mdev, P_DATA_REQUEST, req->sector, req->size, | |
1161 | (unsigned long)req); | |
1162 | ||
1163 | if (!ok) { | |
1164 | /* ?? we set C_TIMEOUT or C_BROKEN_PIPE in drbd_send(); | |
1165 | * so this is probably redundant */ | |
1166 | if (mdev->state.conn >= C_CONNECTED) | |
1167 | drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); | |
1168 | } | |
1169 | req_mod(req, ok ? handed_over_to_network : send_failed); | |
1170 | ||
1171 | return ok; | |
1172 | } | |
1173 | ||
265be2d0 PR |
1174 | int w_restart_disk_io(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
1175 | { | |
1176 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1177 | ||
1178 | if (bio_data_dir(req->master_bio) == WRITE) | |
1179 | drbd_al_begin_io(mdev, req->sector); | |
1180 | /* Calling drbd_al_begin_io() out of the worker might deadlocks | |
1181 | theoretically. Practically it can not deadlock, since this is | |
1182 | only used when unfreezing IOs. All the extents of the requests | |
1183 | that made it into the TL are already active */ | |
1184 | ||
1185 | drbd_req_make_private_bio(req, req->master_bio); | |
1186 | req->private_bio->bi_bdev = mdev->ldev->backing_bdev; | |
1187 | generic_make_request(req->private_bio); | |
1188 | ||
1189 | return 1; | |
1190 | } | |
1191 | ||
b411b363 PR |
1192 | static int _drbd_may_sync_now(struct drbd_conf *mdev) |
1193 | { | |
1194 | struct drbd_conf *odev = mdev; | |
1195 | ||
1196 | while (1) { | |
1197 | if (odev->sync_conf.after == -1) | |
1198 | return 1; | |
1199 | odev = minor_to_mdev(odev->sync_conf.after); | |
1200 | ERR_IF(!odev) return 1; | |
1201 | if ((odev->state.conn >= C_SYNC_SOURCE && | |
1202 | odev->state.conn <= C_PAUSED_SYNC_T) || | |
1203 | odev->state.aftr_isp || odev->state.peer_isp || | |
1204 | odev->state.user_isp) | |
1205 | return 0; | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | /** | |
1210 | * _drbd_pause_after() - Pause resync on all devices that may not resync now | |
1211 | * @mdev: DRBD device. | |
1212 | * | |
1213 | * Called from process context only (admin command and after_state_ch). | |
1214 | */ | |
1215 | static int _drbd_pause_after(struct drbd_conf *mdev) | |
1216 | { | |
1217 | struct drbd_conf *odev; | |
1218 | int i, rv = 0; | |
1219 | ||
1220 | for (i = 0; i < minor_count; i++) { | |
1221 | odev = minor_to_mdev(i); | |
1222 | if (!odev) | |
1223 | continue; | |
1224 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) | |
1225 | continue; | |
1226 | if (!_drbd_may_sync_now(odev)) | |
1227 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL) | |
1228 | != SS_NOTHING_TO_DO); | |
1229 | } | |
1230 | ||
1231 | return rv; | |
1232 | } | |
1233 | ||
1234 | /** | |
1235 | * _drbd_resume_next() - Resume resync on all devices that may resync now | |
1236 | * @mdev: DRBD device. | |
1237 | * | |
1238 | * Called from process context only (admin command and worker). | |
1239 | */ | |
1240 | static int _drbd_resume_next(struct drbd_conf *mdev) | |
1241 | { | |
1242 | struct drbd_conf *odev; | |
1243 | int i, rv = 0; | |
1244 | ||
1245 | for (i = 0; i < minor_count; i++) { | |
1246 | odev = minor_to_mdev(i); | |
1247 | if (!odev) | |
1248 | continue; | |
1249 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) | |
1250 | continue; | |
1251 | if (odev->state.aftr_isp) { | |
1252 | if (_drbd_may_sync_now(odev)) | |
1253 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0), | |
1254 | CS_HARD, NULL) | |
1255 | != SS_NOTHING_TO_DO) ; | |
1256 | } | |
1257 | } | |
1258 | return rv; | |
1259 | } | |
1260 | ||
1261 | void resume_next_sg(struct drbd_conf *mdev) | |
1262 | { | |
1263 | write_lock_irq(&global_state_lock); | |
1264 | _drbd_resume_next(mdev); | |
1265 | write_unlock_irq(&global_state_lock); | |
1266 | } | |
1267 | ||
1268 | void suspend_other_sg(struct drbd_conf *mdev) | |
1269 | { | |
1270 | write_lock_irq(&global_state_lock); | |
1271 | _drbd_pause_after(mdev); | |
1272 | write_unlock_irq(&global_state_lock); | |
1273 | } | |
1274 | ||
1275 | static int sync_after_error(struct drbd_conf *mdev, int o_minor) | |
1276 | { | |
1277 | struct drbd_conf *odev; | |
1278 | ||
1279 | if (o_minor == -1) | |
1280 | return NO_ERROR; | |
1281 | if (o_minor < -1 || minor_to_mdev(o_minor) == NULL) | |
1282 | return ERR_SYNC_AFTER; | |
1283 | ||
1284 | /* check for loops */ | |
1285 | odev = minor_to_mdev(o_minor); | |
1286 | while (1) { | |
1287 | if (odev == mdev) | |
1288 | return ERR_SYNC_AFTER_CYCLE; | |
1289 | ||
1290 | /* dependency chain ends here, no cycles. */ | |
1291 | if (odev->sync_conf.after == -1) | |
1292 | return NO_ERROR; | |
1293 | ||
1294 | /* follow the dependency chain */ | |
1295 | odev = minor_to_mdev(odev->sync_conf.after); | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | int drbd_alter_sa(struct drbd_conf *mdev, int na) | |
1300 | { | |
1301 | int changes; | |
1302 | int retcode; | |
1303 | ||
1304 | write_lock_irq(&global_state_lock); | |
1305 | retcode = sync_after_error(mdev, na); | |
1306 | if (retcode == NO_ERROR) { | |
1307 | mdev->sync_conf.after = na; | |
1308 | do { | |
1309 | changes = _drbd_pause_after(mdev); | |
1310 | changes |= _drbd_resume_next(mdev); | |
1311 | } while (changes); | |
1312 | } | |
1313 | write_unlock_irq(&global_state_lock); | |
1314 | return retcode; | |
1315 | } | |
1316 | ||
309d1608 PR |
1317 | static void ping_peer(struct drbd_conf *mdev) |
1318 | { | |
1319 | clear_bit(GOT_PING_ACK, &mdev->flags); | |
1320 | request_ping(mdev); | |
1321 | wait_event(mdev->misc_wait, | |
1322 | test_bit(GOT_PING_ACK, &mdev->flags) || mdev->state.conn < C_CONNECTED); | |
1323 | } | |
1324 | ||
b411b363 PR |
1325 | /** |
1326 | * drbd_start_resync() - Start the resync process | |
1327 | * @mdev: DRBD device. | |
1328 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET | |
1329 | * | |
1330 | * This function might bring you directly into one of the | |
1331 | * C_PAUSED_SYNC_* states. | |
1332 | */ | |
1333 | void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side) | |
1334 | { | |
1335 | union drbd_state ns; | |
1336 | int r; | |
1337 | ||
1338 | if (mdev->state.conn >= C_SYNC_SOURCE) { | |
1339 | dev_err(DEV, "Resync already running!\n"); | |
1340 | return; | |
1341 | } | |
1342 | ||
b411b363 PR |
1343 | /* In case a previous resync run was aborted by an IO error/detach on the peer. */ |
1344 | drbd_rs_cancel_all(mdev); | |
1345 | ||
1346 | if (side == C_SYNC_TARGET) { | |
1347 | /* Since application IO was locked out during C_WF_BITMAP_T and | |
1348 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET | |
1349 | we check that we might make the data inconsistent. */ | |
1350 | r = drbd_khelper(mdev, "before-resync-target"); | |
1351 | r = (r >> 8) & 0xff; | |
1352 | if (r > 0) { | |
1353 | dev_info(DEV, "before-resync-target handler returned %d, " | |
1354 | "dropping connection.\n", r); | |
1355 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
1356 | return; | |
1357 | } | |
1358 | } | |
1359 | ||
1360 | drbd_state_lock(mdev); | |
1361 | ||
1362 | if (!get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
1363 | drbd_state_unlock(mdev); | |
1364 | return; | |
1365 | } | |
1366 | ||
1367 | if (side == C_SYNC_TARGET) { | |
1368 | mdev->bm_resync_fo = 0; | |
1369 | } else /* side == C_SYNC_SOURCE */ { | |
1370 | u64 uuid; | |
1371 | ||
1372 | get_random_bytes(&uuid, sizeof(u64)); | |
1373 | drbd_uuid_set(mdev, UI_BITMAP, uuid); | |
1374 | drbd_send_sync_uuid(mdev, uuid); | |
1375 | ||
1376 | D_ASSERT(mdev->state.disk == D_UP_TO_DATE); | |
1377 | } | |
1378 | ||
1379 | write_lock_irq(&global_state_lock); | |
1380 | ns = mdev->state; | |
1381 | ||
1382 | ns.aftr_isp = !_drbd_may_sync_now(mdev); | |
1383 | ||
1384 | ns.conn = side; | |
1385 | ||
1386 | if (side == C_SYNC_TARGET) | |
1387 | ns.disk = D_INCONSISTENT; | |
1388 | else /* side == C_SYNC_SOURCE */ | |
1389 | ns.pdsk = D_INCONSISTENT; | |
1390 | ||
1391 | r = __drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
1392 | ns = mdev->state; | |
1393 | ||
1394 | if (ns.conn < C_CONNECTED) | |
1395 | r = SS_UNKNOWN_ERROR; | |
1396 | ||
1397 | if (r == SS_SUCCESS) { | |
1398 | mdev->rs_total = | |
1399 | mdev->rs_mark_left = drbd_bm_total_weight(mdev); | |
1400 | mdev->rs_failed = 0; | |
1401 | mdev->rs_paused = 0; | |
1402 | mdev->rs_start = | |
1403 | mdev->rs_mark_time = jiffies; | |
1404 | mdev->rs_same_csum = 0; | |
1405 | _drbd_pause_after(mdev); | |
1406 | } | |
1407 | write_unlock_irq(&global_state_lock); | |
b411b363 PR |
1408 | put_ldev(mdev); |
1409 | ||
1410 | if (r == SS_SUCCESS) { | |
1411 | dev_info(DEV, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", | |
1412 | drbd_conn_str(ns.conn), | |
1413 | (unsigned long) mdev->rs_total << (BM_BLOCK_SHIFT-10), | |
1414 | (unsigned long) mdev->rs_total); | |
1415 | ||
1416 | if (mdev->rs_total == 0) { | |
1417 | /* Peer still reachable? Beware of failing before-resync-target handlers! */ | |
309d1608 | 1418 | ping_peer(mdev); |
b411b363 | 1419 | drbd_resync_finished(mdev); |
b411b363 PR |
1420 | } |
1421 | ||
1422 | /* ns.conn may already be != mdev->state.conn, | |
1423 | * we may have been paused in between, or become paused until | |
1424 | * the timer triggers. | |
1425 | * No matter, that is handled in resync_timer_fn() */ | |
1426 | if (ns.conn == C_SYNC_TARGET) | |
1427 | mod_timer(&mdev->resync_timer, jiffies); | |
1428 | ||
1429 | drbd_md_sync(mdev); | |
1430 | } | |
d0c3f60f | 1431 | drbd_state_unlock(mdev); |
b411b363 PR |
1432 | } |
1433 | ||
1434 | int drbd_worker(struct drbd_thread *thi) | |
1435 | { | |
1436 | struct drbd_conf *mdev = thi->mdev; | |
1437 | struct drbd_work *w = NULL; | |
1438 | LIST_HEAD(work_list); | |
1439 | int intr = 0, i; | |
1440 | ||
1441 | sprintf(current->comm, "drbd%d_worker", mdev_to_minor(mdev)); | |
1442 | ||
1443 | while (get_t_state(thi) == Running) { | |
1444 | drbd_thread_current_set_cpu(mdev); | |
1445 | ||
1446 | if (down_trylock(&mdev->data.work.s)) { | |
1447 | mutex_lock(&mdev->data.mutex); | |
1448 | if (mdev->data.socket && !mdev->net_conf->no_cork) | |
1449 | drbd_tcp_uncork(mdev->data.socket); | |
1450 | mutex_unlock(&mdev->data.mutex); | |
1451 | ||
1452 | intr = down_interruptible(&mdev->data.work.s); | |
1453 | ||
1454 | mutex_lock(&mdev->data.mutex); | |
1455 | if (mdev->data.socket && !mdev->net_conf->no_cork) | |
1456 | drbd_tcp_cork(mdev->data.socket); | |
1457 | mutex_unlock(&mdev->data.mutex); | |
1458 | } | |
1459 | ||
1460 | if (intr) { | |
1461 | D_ASSERT(intr == -EINTR); | |
1462 | flush_signals(current); | |
1463 | ERR_IF (get_t_state(thi) == Running) | |
1464 | continue; | |
1465 | break; | |
1466 | } | |
1467 | ||
1468 | if (get_t_state(thi) != Running) | |
1469 | break; | |
1470 | /* With this break, we have done a down() but not consumed | |
1471 | the entry from the list. The cleanup code takes care of | |
1472 | this... */ | |
1473 | ||
1474 | w = NULL; | |
1475 | spin_lock_irq(&mdev->data.work.q_lock); | |
1476 | ERR_IF(list_empty(&mdev->data.work.q)) { | |
1477 | /* something terribly wrong in our logic. | |
1478 | * we were able to down() the semaphore, | |
1479 | * but the list is empty... doh. | |
1480 | * | |
1481 | * what is the best thing to do now? | |
1482 | * try again from scratch, restarting the receiver, | |
1483 | * asender, whatnot? could break even more ugly, | |
1484 | * e.g. when we are primary, but no good local data. | |
1485 | * | |
1486 | * I'll try to get away just starting over this loop. | |
1487 | */ | |
1488 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1489 | continue; | |
1490 | } | |
1491 | w = list_entry(mdev->data.work.q.next, struct drbd_work, list); | |
1492 | list_del_init(&w->list); | |
1493 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1494 | ||
1495 | if (!w->cb(mdev, w, mdev->state.conn < C_CONNECTED)) { | |
1496 | /* dev_warn(DEV, "worker: a callback failed! \n"); */ | |
1497 | if (mdev->state.conn >= C_CONNECTED) | |
1498 | drbd_force_state(mdev, | |
1499 | NS(conn, C_NETWORK_FAILURE)); | |
1500 | } | |
1501 | } | |
1502 | D_ASSERT(test_bit(DEVICE_DYING, &mdev->flags)); | |
1503 | D_ASSERT(test_bit(CONFIG_PENDING, &mdev->flags)); | |
1504 | ||
1505 | spin_lock_irq(&mdev->data.work.q_lock); | |
1506 | i = 0; | |
1507 | while (!list_empty(&mdev->data.work.q)) { | |
1508 | list_splice_init(&mdev->data.work.q, &work_list); | |
1509 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1510 | ||
1511 | while (!list_empty(&work_list)) { | |
1512 | w = list_entry(work_list.next, struct drbd_work, list); | |
1513 | list_del_init(&w->list); | |
1514 | w->cb(mdev, w, 1); | |
1515 | i++; /* dead debugging code */ | |
1516 | } | |
1517 | ||
1518 | spin_lock_irq(&mdev->data.work.q_lock); | |
1519 | } | |
1520 | sema_init(&mdev->data.work.s, 0); | |
1521 | /* DANGEROUS race: if someone did queue his work within the spinlock, | |
1522 | * but up() ed outside the spinlock, we could get an up() on the | |
1523 | * semaphore without corresponding list entry. | |
1524 | * So don't do that. | |
1525 | */ | |
1526 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1527 | ||
1528 | D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE); | |
1529 | /* _drbd_set_state only uses stop_nowait. | |
1530 | * wait here for the Exiting receiver. */ | |
1531 | drbd_thread_stop(&mdev->receiver); | |
1532 | drbd_mdev_cleanup(mdev); | |
1533 | ||
1534 | dev_info(DEV, "worker terminated\n"); | |
1535 | ||
1536 | clear_bit(DEVICE_DYING, &mdev->flags); | |
1537 | clear_bit(CONFIG_PENDING, &mdev->flags); | |
1538 | wake_up(&mdev->state_wait); | |
1539 | ||
1540 | return 0; | |
1541 | } |