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 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 | ||
cdd67a74 PR |
417 | static int calc_resync_rate(struct drbd_conf *mdev) |
418 | { | |
419 | int d = mdev->data_delay / 1000; /* us -> ms */ | |
420 | int td = mdev->sync_conf.throttle_th * 100; /* 0.1s -> ms */ | |
421 | int hd = mdev->sync_conf.hold_off_th * 100; /* 0.1s -> ms */ | |
422 | int cr = mdev->sync_conf.rate; | |
423 | ||
424 | return d <= td ? cr : | |
425 | d >= hd ? 0 : | |
426 | cr + (cr * (td - d) / (hd - td)); | |
427 | } | |
428 | ||
b411b363 PR |
429 | int w_make_resync_request(struct drbd_conf *mdev, |
430 | struct drbd_work *w, int cancel) | |
431 | { | |
432 | unsigned long bit; | |
433 | sector_t sector; | |
434 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
435 | int max_segment_size = queue_max_segment_size(mdev->rq_queue); | |
436 | int number, i, size, pe, mx; | |
437 | int align, queued, sndbuf; | |
438 | ||
439 | if (unlikely(cancel)) | |
440 | return 1; | |
441 | ||
442 | if (unlikely(mdev->state.conn < C_CONNECTED)) { | |
443 | dev_err(DEV, "Confused in w_make_resync_request()! cstate < Connected"); | |
444 | return 0; | |
445 | } | |
446 | ||
447 | if (mdev->state.conn != C_SYNC_TARGET) | |
448 | dev_err(DEV, "%s in w_make_resync_request\n", | |
449 | drbd_conn_str(mdev->state.conn)); | |
450 | ||
451 | if (!get_ldev(mdev)) { | |
452 | /* Since we only need to access mdev->rsync a | |
453 | get_ldev_if_state(mdev,D_FAILED) would be sufficient, but | |
454 | to continue resync with a broken disk makes no sense at | |
455 | all */ | |
456 | dev_err(DEV, "Disk broke down during resync!\n"); | |
457 | mdev->resync_work.cb = w_resync_inactive; | |
458 | return 1; | |
459 | } | |
460 | ||
cdd67a74 PR |
461 | mdev->c_sync_rate = calc_resync_rate(mdev); |
462 | number = SLEEP_TIME * mdev->c_sync_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. | |
525 | * | |
526 | * we _do_ care about the agreed-upon q->max_segment_size | |
527 | * here, as splitting up the requests on the other side is more | |
528 | * difficult. the consequence is, that on lvm and md and other | |
529 | * "indirect" devices, this is dead code, since | |
530 | * q->max_segment_size will be PAGE_SIZE. | |
531 | */ | |
532 | align = 1; | |
533 | for (;;) { | |
534 | if (size + BM_BLOCK_SIZE > max_segment_size) | |
535 | break; | |
536 | ||
537 | /* Be always aligned */ | |
538 | if (sector & ((1<<(align+3))-1)) | |
539 | break; | |
540 | ||
541 | /* do not cross extent boundaries */ | |
542 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) | |
543 | break; | |
544 | /* now, is it actually dirty, after all? | |
545 | * caution, drbd_bm_test_bit is tri-state for some | |
546 | * obscure reason; ( b == 0 ) would get the out-of-band | |
547 | * only accidentally right because of the "oddly sized" | |
548 | * adjustment below */ | |
549 | if (drbd_bm_test_bit(mdev, bit+1) != 1) | |
550 | break; | |
551 | bit++; | |
552 | size += BM_BLOCK_SIZE; | |
553 | if ((BM_BLOCK_SIZE << align) <= size) | |
554 | align++; | |
555 | i++; | |
556 | } | |
557 | /* if we merged some, | |
558 | * reset the offset to start the next drbd_bm_find_next from */ | |
559 | if (size > BM_BLOCK_SIZE) | |
560 | mdev->bm_resync_fo = bit + 1; | |
561 | #endif | |
562 | ||
563 | /* adjust very last sectors, in case we are oddly sized */ | |
564 | if (sector + (size>>9) > capacity) | |
565 | size = (capacity-sector)<<9; | |
566 | if (mdev->agreed_pro_version >= 89 && mdev->csums_tfm) { | |
567 | switch (read_for_csum(mdev, sector, size)) { | |
568 | case 0: /* Disk failure*/ | |
569 | put_ldev(mdev); | |
570 | return 0; | |
571 | case 2: /* Allocation failed */ | |
572 | drbd_rs_complete_io(mdev, sector); | |
573 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
574 | goto requeue; | |
575 | /* case 1: everything ok */ | |
576 | } | |
577 | } else { | |
578 | inc_rs_pending(mdev); | |
579 | if (!drbd_send_drequest(mdev, P_RS_DATA_REQUEST, | |
580 | sector, size, ID_SYNCER)) { | |
581 | dev_err(DEV, "drbd_send_drequest() failed, aborting...\n"); | |
582 | dec_rs_pending(mdev); | |
583 | put_ldev(mdev); | |
584 | return 0; | |
585 | } | |
586 | } | |
587 | } | |
588 | ||
589 | if (mdev->bm_resync_fo >= drbd_bm_bits(mdev)) { | |
590 | /* last syncer _request_ was sent, | |
591 | * but the P_RS_DATA_REPLY not yet received. sync will end (and | |
592 | * next sync group will resume), as soon as we receive the last | |
593 | * resync data block, and the last bit is cleared. | |
594 | * until then resync "work" is "inactive" ... | |
595 | */ | |
596 | mdev->resync_work.cb = w_resync_inactive; | |
597 | put_ldev(mdev); | |
598 | return 1; | |
599 | } | |
600 | ||
601 | requeue: | |
602 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); | |
603 | put_ldev(mdev); | |
604 | return 1; | |
605 | } | |
606 | ||
607 | static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
608 | { | |
609 | int number, i, size; | |
610 | sector_t sector; | |
611 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
612 | ||
613 | if (unlikely(cancel)) | |
614 | return 1; | |
615 | ||
616 | if (unlikely(mdev->state.conn < C_CONNECTED)) { | |
617 | dev_err(DEV, "Confused in w_make_ov_request()! cstate < Connected"); | |
618 | return 0; | |
619 | } | |
620 | ||
621 | number = SLEEP_TIME*mdev->sync_conf.rate / ((BM_BLOCK_SIZE/1024)*HZ); | |
622 | if (atomic_read(&mdev->rs_pending_cnt) > number) | |
623 | goto requeue; | |
624 | ||
625 | number -= atomic_read(&mdev->rs_pending_cnt); | |
626 | ||
627 | sector = mdev->ov_position; | |
628 | for (i = 0; i < number; i++) { | |
629 | if (sector >= capacity) { | |
630 | mdev->resync_work.cb = w_resync_inactive; | |
631 | return 1; | |
632 | } | |
633 | ||
634 | size = BM_BLOCK_SIZE; | |
635 | ||
636 | if (drbd_try_rs_begin_io(mdev, sector)) { | |
637 | mdev->ov_position = sector; | |
638 | goto requeue; | |
639 | } | |
640 | ||
641 | if (sector + (size>>9) > capacity) | |
642 | size = (capacity-sector)<<9; | |
643 | ||
644 | inc_rs_pending(mdev); | |
645 | if (!drbd_send_ov_request(mdev, sector, size)) { | |
646 | dec_rs_pending(mdev); | |
647 | return 0; | |
648 | } | |
649 | sector += BM_SECT_PER_BIT; | |
650 | } | |
651 | mdev->ov_position = sector; | |
652 | ||
653 | requeue: | |
654 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); | |
655 | return 1; | |
656 | } | |
657 | ||
658 | ||
659 | int w_ov_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
660 | { | |
661 | kfree(w); | |
662 | ov_oos_print(mdev); | |
663 | drbd_resync_finished(mdev); | |
664 | ||
665 | return 1; | |
666 | } | |
667 | ||
668 | static int w_resync_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
669 | { | |
670 | kfree(w); | |
671 | ||
672 | drbd_resync_finished(mdev); | |
673 | ||
674 | return 1; | |
675 | } | |
676 | ||
677 | int drbd_resync_finished(struct drbd_conf *mdev) | |
678 | { | |
679 | unsigned long db, dt, dbdt; | |
680 | unsigned long n_oos; | |
681 | union drbd_state os, ns; | |
682 | struct drbd_work *w; | |
683 | char *khelper_cmd = NULL; | |
684 | ||
685 | /* Remove all elements from the resync LRU. Since future actions | |
686 | * might set bits in the (main) bitmap, then the entries in the | |
687 | * resync LRU would be wrong. */ | |
688 | if (drbd_rs_del_all(mdev)) { | |
689 | /* In case this is not possible now, most probably because | |
690 | * there are P_RS_DATA_REPLY Packets lingering on the worker's | |
691 | * queue (or even the read operations for those packets | |
692 | * is not finished by now). Retry in 100ms. */ | |
693 | ||
694 | drbd_kick_lo(mdev); | |
695 | __set_current_state(TASK_INTERRUPTIBLE); | |
696 | schedule_timeout(HZ / 10); | |
697 | w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC); | |
698 | if (w) { | |
699 | w->cb = w_resync_finished; | |
700 | drbd_queue_work(&mdev->data.work, w); | |
701 | return 1; | |
702 | } | |
703 | dev_err(DEV, "Warn failed to drbd_rs_del_all() and to kmalloc(w).\n"); | |
704 | } | |
705 | ||
706 | dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ; | |
707 | if (dt <= 0) | |
708 | dt = 1; | |
709 | db = mdev->rs_total; | |
710 | dbdt = Bit2KB(db/dt); | |
711 | mdev->rs_paused /= HZ; | |
712 | ||
713 | if (!get_ldev(mdev)) | |
714 | goto out; | |
715 | ||
716 | spin_lock_irq(&mdev->req_lock); | |
717 | os = mdev->state; | |
718 | ||
719 | /* This protects us against multiple calls (that can happen in the presence | |
720 | of application IO), and against connectivity loss just before we arrive here. */ | |
721 | if (os.conn <= C_CONNECTED) | |
722 | goto out_unlock; | |
723 | ||
724 | ns = os; | |
725 | ns.conn = C_CONNECTED; | |
726 | ||
727 | dev_info(DEV, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", | |
728 | (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) ? | |
729 | "Online verify " : "Resync", | |
730 | dt + mdev->rs_paused, mdev->rs_paused, dbdt); | |
731 | ||
732 | n_oos = drbd_bm_total_weight(mdev); | |
733 | ||
734 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { | |
735 | if (n_oos) { | |
736 | dev_alert(DEV, "Online verify found %lu %dk block out of sync!\n", | |
737 | n_oos, Bit2KB(1)); | |
738 | khelper_cmd = "out-of-sync"; | |
739 | } | |
740 | } else { | |
741 | D_ASSERT((n_oos - mdev->rs_failed) == 0); | |
742 | ||
743 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) | |
744 | khelper_cmd = "after-resync-target"; | |
745 | ||
746 | if (mdev->csums_tfm && mdev->rs_total) { | |
747 | const unsigned long s = mdev->rs_same_csum; | |
748 | const unsigned long t = mdev->rs_total; | |
749 | const int ratio = | |
750 | (t == 0) ? 0 : | |
751 | (t < 100000) ? ((s*100)/t) : (s/(t/100)); | |
752 | dev_info(DEV, "%u %% had equal check sums, eliminated: %luK; " | |
753 | "transferred %luK total %luK\n", | |
754 | ratio, | |
755 | Bit2KB(mdev->rs_same_csum), | |
756 | Bit2KB(mdev->rs_total - mdev->rs_same_csum), | |
757 | Bit2KB(mdev->rs_total)); | |
758 | } | |
759 | } | |
760 | ||
761 | if (mdev->rs_failed) { | |
762 | dev_info(DEV, " %lu failed blocks\n", mdev->rs_failed); | |
763 | ||
764 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
765 | ns.disk = D_INCONSISTENT; | |
766 | ns.pdsk = D_UP_TO_DATE; | |
767 | } else { | |
768 | ns.disk = D_UP_TO_DATE; | |
769 | ns.pdsk = D_INCONSISTENT; | |
770 | } | |
771 | } else { | |
772 | ns.disk = D_UP_TO_DATE; | |
773 | ns.pdsk = D_UP_TO_DATE; | |
774 | ||
775 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
776 | if (mdev->p_uuid) { | |
777 | int i; | |
778 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) | |
779 | _drbd_uuid_set(mdev, i, mdev->p_uuid[i]); | |
780 | drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_CURRENT]); | |
781 | _drbd_uuid_set(mdev, UI_CURRENT, mdev->p_uuid[UI_CURRENT]); | |
782 | } else { | |
783 | dev_err(DEV, "mdev->p_uuid is NULL! BUG\n"); | |
784 | } | |
785 | } | |
786 | ||
787 | drbd_uuid_set_bm(mdev, 0UL); | |
788 | ||
789 | if (mdev->p_uuid) { | |
790 | /* Now the two UUID sets are equal, update what we | |
791 | * know of the peer. */ | |
792 | int i; | |
793 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) | |
794 | mdev->p_uuid[i] = mdev->ldev->md.uuid[i]; | |
795 | } | |
796 | } | |
797 | ||
798 | _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
799 | out_unlock: | |
800 | spin_unlock_irq(&mdev->req_lock); | |
801 | put_ldev(mdev); | |
802 | out: | |
803 | mdev->rs_total = 0; | |
804 | mdev->rs_failed = 0; | |
805 | mdev->rs_paused = 0; | |
806 | mdev->ov_start_sector = 0; | |
807 | ||
808 | if (test_and_clear_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags)) { | |
809 | dev_warn(DEV, "Writing the whole bitmap, due to failed kmalloc\n"); | |
810 | drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, "write from resync_finished"); | |
811 | } | |
812 | ||
813 | if (khelper_cmd) | |
814 | drbd_khelper(mdev, khelper_cmd); | |
815 | ||
816 | return 1; | |
817 | } | |
818 | ||
819 | /* helper */ | |
820 | static void move_to_net_ee_or_free(struct drbd_conf *mdev, struct drbd_epoch_entry *e) | |
821 | { | |
822 | if (drbd_bio_has_active_page(e->private_bio)) { | |
823 | /* This might happen if sendpage() has not finished */ | |
824 | spin_lock_irq(&mdev->req_lock); | |
825 | list_add_tail(&e->w.list, &mdev->net_ee); | |
826 | spin_unlock_irq(&mdev->req_lock); | |
827 | } else | |
828 | drbd_free_ee(mdev, e); | |
829 | } | |
830 | ||
831 | /** | |
832 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST | |
833 | * @mdev: DRBD device. | |
834 | * @w: work object. | |
835 | * @cancel: The connection will be closed anyways | |
836 | */ | |
837 | int w_e_end_data_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
838 | { | |
839 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
840 | int ok; | |
841 | ||
842 | if (unlikely(cancel)) { | |
843 | drbd_free_ee(mdev, e); | |
844 | dec_unacked(mdev); | |
845 | return 1; | |
846 | } | |
847 | ||
848 | if (likely(drbd_bio_uptodate(e->private_bio))) { | |
849 | ok = drbd_send_block(mdev, P_DATA_REPLY, e); | |
850 | } else { | |
851 | if (__ratelimit(&drbd_ratelimit_state)) | |
852 | dev_err(DEV, "Sending NegDReply. sector=%llus.\n", | |
853 | (unsigned long long)e->sector); | |
854 | ||
855 | ok = drbd_send_ack(mdev, P_NEG_DREPLY, e); | |
856 | } | |
857 | ||
858 | dec_unacked(mdev); | |
859 | ||
860 | move_to_net_ee_or_free(mdev, e); | |
861 | ||
862 | if (unlikely(!ok)) | |
863 | dev_err(DEV, "drbd_send_block() failed\n"); | |
864 | return ok; | |
865 | } | |
866 | ||
867 | /** | |
868 | * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUESTRS | |
869 | * @mdev: DRBD device. | |
870 | * @w: work object. | |
871 | * @cancel: The connection will be closed anyways | |
872 | */ | |
873 | int w_e_end_rsdata_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
874 | { | |
875 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
876 | int ok; | |
877 | ||
878 | if (unlikely(cancel)) { | |
879 | drbd_free_ee(mdev, e); | |
880 | dec_unacked(mdev); | |
881 | return 1; | |
882 | } | |
883 | ||
884 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
885 | drbd_rs_complete_io(mdev, e->sector); | |
886 | put_ldev(mdev); | |
887 | } | |
888 | ||
889 | if (likely(drbd_bio_uptodate(e->private_bio))) { | |
890 | if (likely(mdev->state.pdsk >= D_INCONSISTENT)) { | |
891 | inc_rs_pending(mdev); | |
892 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); | |
893 | } else { | |
894 | if (__ratelimit(&drbd_ratelimit_state)) | |
895 | dev_err(DEV, "Not sending RSDataReply, " | |
896 | "partner DISKLESS!\n"); | |
897 | ok = 1; | |
898 | } | |
899 | } else { | |
900 | if (__ratelimit(&drbd_ratelimit_state)) | |
901 | dev_err(DEV, "Sending NegRSDReply. sector %llus.\n", | |
902 | (unsigned long long)e->sector); | |
903 | ||
904 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); | |
905 | ||
906 | /* update resync data with failure */ | |
907 | drbd_rs_failed_io(mdev, e->sector, e->size); | |
908 | } | |
909 | ||
910 | dec_unacked(mdev); | |
911 | ||
912 | move_to_net_ee_or_free(mdev, e); | |
913 | ||
914 | if (unlikely(!ok)) | |
915 | dev_err(DEV, "drbd_send_block() failed\n"); | |
916 | return ok; | |
917 | } | |
918 | ||
919 | int w_e_end_csum_rs_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
920 | { | |
921 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
922 | struct digest_info *di; | |
923 | int digest_size; | |
924 | void *digest = NULL; | |
925 | int ok, eq = 0; | |
926 | ||
927 | if (unlikely(cancel)) { | |
928 | drbd_free_ee(mdev, e); | |
929 | dec_unacked(mdev); | |
930 | return 1; | |
931 | } | |
932 | ||
933 | drbd_rs_complete_io(mdev, e->sector); | |
934 | ||
935 | di = (struct digest_info *)(unsigned long)e->block_id; | |
936 | ||
937 | if (likely(drbd_bio_uptodate(e->private_bio))) { | |
938 | /* quick hack to try to avoid a race against reconfiguration. | |
939 | * a real fix would be much more involved, | |
940 | * introducing more locking mechanisms */ | |
941 | if (mdev->csums_tfm) { | |
942 | digest_size = crypto_hash_digestsize(mdev->csums_tfm); | |
943 | D_ASSERT(digest_size == di->digest_size); | |
944 | digest = kmalloc(digest_size, GFP_NOIO); | |
945 | } | |
946 | if (digest) { | |
947 | drbd_csum(mdev, mdev->csums_tfm, e->private_bio, digest); | |
948 | eq = !memcmp(digest, di->digest, digest_size); | |
949 | kfree(digest); | |
950 | } | |
951 | ||
952 | if (eq) { | |
953 | drbd_set_in_sync(mdev, e->sector, e->size); | |
676396d5 LE |
954 | /* rs_same_csums unit is BM_BLOCK_SIZE */ |
955 | mdev->rs_same_csum += e->size >> BM_BLOCK_SHIFT; | |
b411b363 PR |
956 | ok = drbd_send_ack(mdev, P_RS_IS_IN_SYNC, e); |
957 | } else { | |
958 | inc_rs_pending(mdev); | |
959 | e->block_id = ID_SYNCER; | |
960 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); | |
961 | } | |
962 | } else { | |
963 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); | |
964 | if (__ratelimit(&drbd_ratelimit_state)) | |
965 | dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); | |
966 | } | |
967 | ||
968 | dec_unacked(mdev); | |
969 | ||
970 | kfree(di); | |
971 | ||
972 | move_to_net_ee_or_free(mdev, e); | |
973 | ||
974 | if (unlikely(!ok)) | |
975 | dev_err(DEV, "drbd_send_block/ack() failed\n"); | |
976 | return ok; | |
977 | } | |
978 | ||
979 | int w_e_end_ov_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
980 | { | |
981 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
982 | int digest_size; | |
983 | void *digest; | |
984 | int ok = 1; | |
985 | ||
986 | if (unlikely(cancel)) | |
987 | goto out; | |
988 | ||
989 | if (unlikely(!drbd_bio_uptodate(e->private_bio))) | |
990 | goto out; | |
991 | ||
992 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); | |
993 | /* FIXME if this allocation fails, online verify will not terminate! */ | |
994 | digest = kmalloc(digest_size, GFP_NOIO); | |
995 | if (digest) { | |
996 | drbd_csum(mdev, mdev->verify_tfm, e->private_bio, digest); | |
997 | inc_rs_pending(mdev); | |
998 | ok = drbd_send_drequest_csum(mdev, e->sector, e->size, | |
999 | digest, digest_size, P_OV_REPLY); | |
1000 | if (!ok) | |
1001 | dec_rs_pending(mdev); | |
1002 | kfree(digest); | |
1003 | } | |
1004 | ||
1005 | out: | |
1006 | drbd_free_ee(mdev, e); | |
1007 | ||
1008 | dec_unacked(mdev); | |
1009 | ||
1010 | return ok; | |
1011 | } | |
1012 | ||
1013 | void drbd_ov_oos_found(struct drbd_conf *mdev, sector_t sector, int size) | |
1014 | { | |
1015 | if (mdev->ov_last_oos_start + mdev->ov_last_oos_size == sector) { | |
1016 | mdev->ov_last_oos_size += size>>9; | |
1017 | } else { | |
1018 | mdev->ov_last_oos_start = sector; | |
1019 | mdev->ov_last_oos_size = size>>9; | |
1020 | } | |
1021 | drbd_set_out_of_sync(mdev, sector, size); | |
1022 | set_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags); | |
1023 | } | |
1024 | ||
1025 | int w_e_end_ov_reply(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1026 | { | |
1027 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
1028 | struct digest_info *di; | |
1029 | int digest_size; | |
1030 | void *digest; | |
1031 | int ok, eq = 0; | |
1032 | ||
1033 | if (unlikely(cancel)) { | |
1034 | drbd_free_ee(mdev, e); | |
1035 | dec_unacked(mdev); | |
1036 | return 1; | |
1037 | } | |
1038 | ||
1039 | /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all | |
1040 | * the resync lru has been cleaned up already */ | |
1041 | drbd_rs_complete_io(mdev, e->sector); | |
1042 | ||
1043 | di = (struct digest_info *)(unsigned long)e->block_id; | |
1044 | ||
1045 | if (likely(drbd_bio_uptodate(e->private_bio))) { | |
1046 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); | |
1047 | digest = kmalloc(digest_size, GFP_NOIO); | |
1048 | if (digest) { | |
1049 | drbd_csum(mdev, mdev->verify_tfm, e->private_bio, digest); | |
1050 | ||
1051 | D_ASSERT(digest_size == di->digest_size); | |
1052 | eq = !memcmp(digest, di->digest, digest_size); | |
1053 | kfree(digest); | |
1054 | } | |
1055 | } else { | |
1056 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); | |
1057 | if (__ratelimit(&drbd_ratelimit_state)) | |
1058 | dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); | |
1059 | } | |
1060 | ||
1061 | dec_unacked(mdev); | |
1062 | ||
1063 | kfree(di); | |
1064 | ||
1065 | if (!eq) | |
1066 | drbd_ov_oos_found(mdev, e->sector, e->size); | |
1067 | else | |
1068 | ov_oos_print(mdev); | |
1069 | ||
1070 | ok = drbd_send_ack_ex(mdev, P_OV_RESULT, e->sector, e->size, | |
1071 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); | |
1072 | ||
1073 | drbd_free_ee(mdev, e); | |
1074 | ||
1075 | if (--mdev->ov_left == 0) { | |
1076 | ov_oos_print(mdev); | |
1077 | drbd_resync_finished(mdev); | |
1078 | } | |
1079 | ||
1080 | return ok; | |
1081 | } | |
1082 | ||
1083 | int w_prev_work_done(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1084 | { | |
1085 | struct drbd_wq_barrier *b = container_of(w, struct drbd_wq_barrier, w); | |
1086 | complete(&b->done); | |
1087 | return 1; | |
1088 | } | |
1089 | ||
1090 | int w_send_barrier(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1091 | { | |
1092 | struct drbd_tl_epoch *b = container_of(w, struct drbd_tl_epoch, w); | |
1093 | struct p_barrier *p = &mdev->data.sbuf.barrier; | |
1094 | int ok = 1; | |
1095 | ||
1096 | /* really avoid racing with tl_clear. w.cb may have been referenced | |
1097 | * just before it was reassigned and re-queued, so double check that. | |
1098 | * actually, this race was harmless, since we only try to send the | |
1099 | * barrier packet here, and otherwise do nothing with the object. | |
1100 | * but compare with the head of w_clear_epoch */ | |
1101 | spin_lock_irq(&mdev->req_lock); | |
1102 | if (w->cb != w_send_barrier || mdev->state.conn < C_CONNECTED) | |
1103 | cancel = 1; | |
1104 | spin_unlock_irq(&mdev->req_lock); | |
1105 | if (cancel) | |
1106 | return 1; | |
1107 | ||
1108 | if (!drbd_get_data_sock(mdev)) | |
1109 | return 0; | |
1110 | p->barrier = b->br_number; | |
1111 | /* inc_ap_pending was done where this was queued. | |
1112 | * dec_ap_pending will be done in got_BarrierAck | |
1113 | * or (on connection loss) in w_clear_epoch. */ | |
1114 | ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BARRIER, | |
1115 | (struct p_header *)p, sizeof(*p), 0); | |
1116 | drbd_put_data_sock(mdev); | |
1117 | ||
1118 | return ok; | |
1119 | } | |
1120 | ||
1121 | int w_send_write_hint(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1122 | { | |
1123 | if (cancel) | |
1124 | return 1; | |
1125 | return drbd_send_short_cmd(mdev, P_UNPLUG_REMOTE); | |
1126 | } | |
1127 | ||
1128 | /** | |
1129 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request | |
1130 | * @mdev: DRBD device. | |
1131 | * @w: work object. | |
1132 | * @cancel: The connection will be closed anyways | |
1133 | */ | |
1134 | int w_send_dblock(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1135 | { | |
1136 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1137 | int ok; | |
1138 | ||
1139 | if (unlikely(cancel)) { | |
1140 | req_mod(req, send_canceled); | |
1141 | return 1; | |
1142 | } | |
1143 | ||
1144 | ok = drbd_send_dblock(mdev, req); | |
1145 | req_mod(req, ok ? handed_over_to_network : send_failed); | |
1146 | ||
1147 | return ok; | |
1148 | } | |
1149 | ||
1150 | /** | |
1151 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet | |
1152 | * @mdev: DRBD device. | |
1153 | * @w: work object. | |
1154 | * @cancel: The connection will be closed anyways | |
1155 | */ | |
1156 | int w_send_read_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1157 | { | |
1158 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1159 | int ok; | |
1160 | ||
1161 | if (unlikely(cancel)) { | |
1162 | req_mod(req, send_canceled); | |
1163 | return 1; | |
1164 | } | |
1165 | ||
1166 | ok = drbd_send_drequest(mdev, P_DATA_REQUEST, req->sector, req->size, | |
1167 | (unsigned long)req); | |
1168 | ||
1169 | if (!ok) { | |
1170 | /* ?? we set C_TIMEOUT or C_BROKEN_PIPE in drbd_send(); | |
1171 | * so this is probably redundant */ | |
1172 | if (mdev->state.conn >= C_CONNECTED) | |
1173 | drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); | |
1174 | } | |
1175 | req_mod(req, ok ? handed_over_to_network : send_failed); | |
1176 | ||
1177 | return ok; | |
1178 | } | |
1179 | ||
1180 | static int _drbd_may_sync_now(struct drbd_conf *mdev) | |
1181 | { | |
1182 | struct drbd_conf *odev = mdev; | |
1183 | ||
1184 | while (1) { | |
1185 | if (odev->sync_conf.after == -1) | |
1186 | return 1; | |
1187 | odev = minor_to_mdev(odev->sync_conf.after); | |
1188 | ERR_IF(!odev) return 1; | |
1189 | if ((odev->state.conn >= C_SYNC_SOURCE && | |
1190 | odev->state.conn <= C_PAUSED_SYNC_T) || | |
1191 | odev->state.aftr_isp || odev->state.peer_isp || | |
1192 | odev->state.user_isp) | |
1193 | return 0; | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | /** | |
1198 | * _drbd_pause_after() - Pause resync on all devices that may not resync now | |
1199 | * @mdev: DRBD device. | |
1200 | * | |
1201 | * Called from process context only (admin command and after_state_ch). | |
1202 | */ | |
1203 | static int _drbd_pause_after(struct drbd_conf *mdev) | |
1204 | { | |
1205 | struct drbd_conf *odev; | |
1206 | int i, rv = 0; | |
1207 | ||
1208 | for (i = 0; i < minor_count; i++) { | |
1209 | odev = minor_to_mdev(i); | |
1210 | if (!odev) | |
1211 | continue; | |
1212 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) | |
1213 | continue; | |
1214 | if (!_drbd_may_sync_now(odev)) | |
1215 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL) | |
1216 | != SS_NOTHING_TO_DO); | |
1217 | } | |
1218 | ||
1219 | return rv; | |
1220 | } | |
1221 | ||
1222 | /** | |
1223 | * _drbd_resume_next() - Resume resync on all devices that may resync now | |
1224 | * @mdev: DRBD device. | |
1225 | * | |
1226 | * Called from process context only (admin command and worker). | |
1227 | */ | |
1228 | static int _drbd_resume_next(struct drbd_conf *mdev) | |
1229 | { | |
1230 | struct drbd_conf *odev; | |
1231 | int i, rv = 0; | |
1232 | ||
1233 | for (i = 0; i < minor_count; i++) { | |
1234 | odev = minor_to_mdev(i); | |
1235 | if (!odev) | |
1236 | continue; | |
1237 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) | |
1238 | continue; | |
1239 | if (odev->state.aftr_isp) { | |
1240 | if (_drbd_may_sync_now(odev)) | |
1241 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0), | |
1242 | CS_HARD, NULL) | |
1243 | != SS_NOTHING_TO_DO) ; | |
1244 | } | |
1245 | } | |
1246 | return rv; | |
1247 | } | |
1248 | ||
1249 | void resume_next_sg(struct drbd_conf *mdev) | |
1250 | { | |
1251 | write_lock_irq(&global_state_lock); | |
1252 | _drbd_resume_next(mdev); | |
1253 | write_unlock_irq(&global_state_lock); | |
1254 | } | |
1255 | ||
1256 | void suspend_other_sg(struct drbd_conf *mdev) | |
1257 | { | |
1258 | write_lock_irq(&global_state_lock); | |
1259 | _drbd_pause_after(mdev); | |
1260 | write_unlock_irq(&global_state_lock); | |
1261 | } | |
1262 | ||
1263 | static int sync_after_error(struct drbd_conf *mdev, int o_minor) | |
1264 | { | |
1265 | struct drbd_conf *odev; | |
1266 | ||
1267 | if (o_minor == -1) | |
1268 | return NO_ERROR; | |
1269 | if (o_minor < -1 || minor_to_mdev(o_minor) == NULL) | |
1270 | return ERR_SYNC_AFTER; | |
1271 | ||
1272 | /* check for loops */ | |
1273 | odev = minor_to_mdev(o_minor); | |
1274 | while (1) { | |
1275 | if (odev == mdev) | |
1276 | return ERR_SYNC_AFTER_CYCLE; | |
1277 | ||
1278 | /* dependency chain ends here, no cycles. */ | |
1279 | if (odev->sync_conf.after == -1) | |
1280 | return NO_ERROR; | |
1281 | ||
1282 | /* follow the dependency chain */ | |
1283 | odev = minor_to_mdev(odev->sync_conf.after); | |
1284 | } | |
1285 | } | |
1286 | ||
1287 | int drbd_alter_sa(struct drbd_conf *mdev, int na) | |
1288 | { | |
1289 | int changes; | |
1290 | int retcode; | |
1291 | ||
1292 | write_lock_irq(&global_state_lock); | |
1293 | retcode = sync_after_error(mdev, na); | |
1294 | if (retcode == NO_ERROR) { | |
1295 | mdev->sync_conf.after = na; | |
1296 | do { | |
1297 | changes = _drbd_pause_after(mdev); | |
1298 | changes |= _drbd_resume_next(mdev); | |
1299 | } while (changes); | |
1300 | } | |
1301 | write_unlock_irq(&global_state_lock); | |
1302 | return retcode; | |
1303 | } | |
1304 | ||
309d1608 PR |
1305 | static void ping_peer(struct drbd_conf *mdev) |
1306 | { | |
1307 | clear_bit(GOT_PING_ACK, &mdev->flags); | |
1308 | request_ping(mdev); | |
1309 | wait_event(mdev->misc_wait, | |
1310 | test_bit(GOT_PING_ACK, &mdev->flags) || mdev->state.conn < C_CONNECTED); | |
1311 | } | |
1312 | ||
b411b363 PR |
1313 | /** |
1314 | * drbd_start_resync() - Start the resync process | |
1315 | * @mdev: DRBD device. | |
1316 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET | |
1317 | * | |
1318 | * This function might bring you directly into one of the | |
1319 | * C_PAUSED_SYNC_* states. | |
1320 | */ | |
1321 | void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side) | |
1322 | { | |
1323 | union drbd_state ns; | |
1324 | int r; | |
1325 | ||
1326 | if (mdev->state.conn >= C_SYNC_SOURCE) { | |
1327 | dev_err(DEV, "Resync already running!\n"); | |
1328 | return; | |
1329 | } | |
1330 | ||
b411b363 PR |
1331 | /* In case a previous resync run was aborted by an IO error/detach on the peer. */ |
1332 | drbd_rs_cancel_all(mdev); | |
1333 | ||
1334 | if (side == C_SYNC_TARGET) { | |
1335 | /* Since application IO was locked out during C_WF_BITMAP_T and | |
1336 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET | |
1337 | we check that we might make the data inconsistent. */ | |
1338 | r = drbd_khelper(mdev, "before-resync-target"); | |
1339 | r = (r >> 8) & 0xff; | |
1340 | if (r > 0) { | |
1341 | dev_info(DEV, "before-resync-target handler returned %d, " | |
1342 | "dropping connection.\n", r); | |
1343 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
1344 | return; | |
1345 | } | |
1346 | } | |
1347 | ||
1348 | drbd_state_lock(mdev); | |
1349 | ||
1350 | if (!get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
1351 | drbd_state_unlock(mdev); | |
1352 | return; | |
1353 | } | |
1354 | ||
1355 | if (side == C_SYNC_TARGET) { | |
1356 | mdev->bm_resync_fo = 0; | |
1357 | } else /* side == C_SYNC_SOURCE */ { | |
1358 | u64 uuid; | |
1359 | ||
1360 | get_random_bytes(&uuid, sizeof(u64)); | |
1361 | drbd_uuid_set(mdev, UI_BITMAP, uuid); | |
1362 | drbd_send_sync_uuid(mdev, uuid); | |
1363 | ||
1364 | D_ASSERT(mdev->state.disk == D_UP_TO_DATE); | |
1365 | } | |
1366 | ||
1367 | write_lock_irq(&global_state_lock); | |
1368 | ns = mdev->state; | |
1369 | ||
1370 | ns.aftr_isp = !_drbd_may_sync_now(mdev); | |
1371 | ||
1372 | ns.conn = side; | |
1373 | ||
1374 | if (side == C_SYNC_TARGET) | |
1375 | ns.disk = D_INCONSISTENT; | |
1376 | else /* side == C_SYNC_SOURCE */ | |
1377 | ns.pdsk = D_INCONSISTENT; | |
1378 | ||
1379 | r = __drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
1380 | ns = mdev->state; | |
1381 | ||
1382 | if (ns.conn < C_CONNECTED) | |
1383 | r = SS_UNKNOWN_ERROR; | |
1384 | ||
1385 | if (r == SS_SUCCESS) { | |
1386 | mdev->rs_total = | |
1387 | mdev->rs_mark_left = drbd_bm_total_weight(mdev); | |
1388 | mdev->rs_failed = 0; | |
1389 | mdev->rs_paused = 0; | |
1390 | mdev->rs_start = | |
1391 | mdev->rs_mark_time = jiffies; | |
1392 | mdev->rs_same_csum = 0; | |
1393 | _drbd_pause_after(mdev); | |
1394 | } | |
1395 | write_unlock_irq(&global_state_lock); | |
b411b363 PR |
1396 | put_ldev(mdev); |
1397 | ||
1398 | if (r == SS_SUCCESS) { | |
1399 | dev_info(DEV, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", | |
1400 | drbd_conn_str(ns.conn), | |
1401 | (unsigned long) mdev->rs_total << (BM_BLOCK_SHIFT-10), | |
1402 | (unsigned long) mdev->rs_total); | |
1403 | ||
1404 | if (mdev->rs_total == 0) { | |
1405 | /* Peer still reachable? Beware of failing before-resync-target handlers! */ | |
309d1608 | 1406 | ping_peer(mdev); |
b411b363 | 1407 | drbd_resync_finished(mdev); |
b411b363 PR |
1408 | } |
1409 | ||
1410 | /* ns.conn may already be != mdev->state.conn, | |
1411 | * we may have been paused in between, or become paused until | |
1412 | * the timer triggers. | |
1413 | * No matter, that is handled in resync_timer_fn() */ | |
1414 | if (ns.conn == C_SYNC_TARGET) | |
1415 | mod_timer(&mdev->resync_timer, jiffies); | |
1416 | ||
1417 | drbd_md_sync(mdev); | |
1418 | } | |
d0c3f60f | 1419 | drbd_state_unlock(mdev); |
b411b363 PR |
1420 | } |
1421 | ||
1422 | int drbd_worker(struct drbd_thread *thi) | |
1423 | { | |
1424 | struct drbd_conf *mdev = thi->mdev; | |
1425 | struct drbd_work *w = NULL; | |
1426 | LIST_HEAD(work_list); | |
1427 | int intr = 0, i; | |
1428 | ||
1429 | sprintf(current->comm, "drbd%d_worker", mdev_to_minor(mdev)); | |
1430 | ||
1431 | while (get_t_state(thi) == Running) { | |
1432 | drbd_thread_current_set_cpu(mdev); | |
1433 | ||
1434 | if (down_trylock(&mdev->data.work.s)) { | |
1435 | mutex_lock(&mdev->data.mutex); | |
1436 | if (mdev->data.socket && !mdev->net_conf->no_cork) | |
1437 | drbd_tcp_uncork(mdev->data.socket); | |
1438 | mutex_unlock(&mdev->data.mutex); | |
1439 | ||
1440 | intr = down_interruptible(&mdev->data.work.s); | |
1441 | ||
1442 | mutex_lock(&mdev->data.mutex); | |
1443 | if (mdev->data.socket && !mdev->net_conf->no_cork) | |
1444 | drbd_tcp_cork(mdev->data.socket); | |
1445 | mutex_unlock(&mdev->data.mutex); | |
1446 | } | |
1447 | ||
1448 | if (intr) { | |
1449 | D_ASSERT(intr == -EINTR); | |
1450 | flush_signals(current); | |
1451 | ERR_IF (get_t_state(thi) == Running) | |
1452 | continue; | |
1453 | break; | |
1454 | } | |
1455 | ||
1456 | if (get_t_state(thi) != Running) | |
1457 | break; | |
1458 | /* With this break, we have done a down() but not consumed | |
1459 | the entry from the list. The cleanup code takes care of | |
1460 | this... */ | |
1461 | ||
1462 | w = NULL; | |
1463 | spin_lock_irq(&mdev->data.work.q_lock); | |
1464 | ERR_IF(list_empty(&mdev->data.work.q)) { | |
1465 | /* something terribly wrong in our logic. | |
1466 | * we were able to down() the semaphore, | |
1467 | * but the list is empty... doh. | |
1468 | * | |
1469 | * what is the best thing to do now? | |
1470 | * try again from scratch, restarting the receiver, | |
1471 | * asender, whatnot? could break even more ugly, | |
1472 | * e.g. when we are primary, but no good local data. | |
1473 | * | |
1474 | * I'll try to get away just starting over this loop. | |
1475 | */ | |
1476 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1477 | continue; | |
1478 | } | |
1479 | w = list_entry(mdev->data.work.q.next, struct drbd_work, list); | |
1480 | list_del_init(&w->list); | |
1481 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1482 | ||
1483 | if (!w->cb(mdev, w, mdev->state.conn < C_CONNECTED)) { | |
1484 | /* dev_warn(DEV, "worker: a callback failed! \n"); */ | |
1485 | if (mdev->state.conn >= C_CONNECTED) | |
1486 | drbd_force_state(mdev, | |
1487 | NS(conn, C_NETWORK_FAILURE)); | |
1488 | } | |
1489 | } | |
1490 | D_ASSERT(test_bit(DEVICE_DYING, &mdev->flags)); | |
1491 | D_ASSERT(test_bit(CONFIG_PENDING, &mdev->flags)); | |
1492 | ||
1493 | spin_lock_irq(&mdev->data.work.q_lock); | |
1494 | i = 0; | |
1495 | while (!list_empty(&mdev->data.work.q)) { | |
1496 | list_splice_init(&mdev->data.work.q, &work_list); | |
1497 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1498 | ||
1499 | while (!list_empty(&work_list)) { | |
1500 | w = list_entry(work_list.next, struct drbd_work, list); | |
1501 | list_del_init(&w->list); | |
1502 | w->cb(mdev, w, 1); | |
1503 | i++; /* dead debugging code */ | |
1504 | } | |
1505 | ||
1506 | spin_lock_irq(&mdev->data.work.q_lock); | |
1507 | } | |
1508 | sema_init(&mdev->data.work.s, 0); | |
1509 | /* DANGEROUS race: if someone did queue his work within the spinlock, | |
1510 | * but up() ed outside the spinlock, we could get an up() on the | |
1511 | * semaphore without corresponding list entry. | |
1512 | * So don't do that. | |
1513 | */ | |
1514 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1515 | ||
1516 | D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE); | |
1517 | /* _drbd_set_state only uses stop_nowait. | |
1518 | * wait here for the Exiting receiver. */ | |
1519 | drbd_thread_stop(&mdev->receiver); | |
1520 | drbd_mdev_cleanup(mdev); | |
1521 | ||
1522 | dev_info(DEV, "worker terminated\n"); | |
1523 | ||
1524 | clear_bit(DEVICE_DYING, &mdev->flags); | |
1525 | clear_bit(CONFIG_PENDING, &mdev->flags); | |
1526 | wake_up(&mdev->state_wait); | |
1527 | ||
1528 | return 0; | |
1529 | } |