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