projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
drbd: use rolling marks for resync speed calculation
[deliverable/linux.git] / drivers / block / drbd / drbd_actlog.c
CommitLineData
b411b363
PR		 1/*
2 drbd_actlog.c
3
4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
5
6 Copyright (C) 2003-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 2003-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2003-2008, 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
26#include <linux/slab.h>
27#include <linux/drbd.h>
28#include "drbd_int.h"
b411b363
PR		 29#include "drbd_wrappers.h"
30
31/* We maintain a trivial check sum in our on disk activity log.
32 * With that we can ensure correct operation even when the storage
33 * device might do a partial (last) sector write while loosing power.
34 */
35struct __packed al_transaction {
36 u32 magic;
37 u32 tr_number;
38 struct __packed {
39 u32 pos;
40 u32 extent; } updates[1 + AL_EXTENTS_PT];
41 u32 xor_sum;
42};
43
44struct update_odbm_work {
45 struct drbd_work w;
46 unsigned int enr;
47};
48
49struct update_al_work {
50 struct drbd_work w;
51 struct lc_element *al_ext;
52 struct completion event;
53 unsigned int enr;
54 /* if old_enr != LC_FREE, write corresponding bitmap sector, too */
55 unsigned int old_enr;
56};
57
58struct drbd_atodb_wait {
59 atomic_t count;
60 struct completion io_done;
61 struct drbd_conf *mdev;
62 int error;
63};
64
65
66int w_al_write_transaction(struct drbd_conf *, struct drbd_work *, int);
67
b411b363
PR		 68static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
69 struct drbd_backing_dev *bdev,
70 struct page *page, sector_t sector,
71 int rw, int size)
72{
73 struct bio *bio;
74 struct drbd_md_io md_io;
75 int ok;
76
77 md_io.mdev = mdev;
78 init_completion(&md_io.event);
79 md_io.error = 0;
80
81 if ((rw & WRITE) && !test_bit(MD_NO_BARRIER, &mdev->flags))
7b6d91da
CH		 82 rw |= REQ_HARDBARRIER;
83 rw |= REQ_UNPLUG | REQ_SYNC;
b411b363
PR		 84
85 retry:
86 bio = bio_alloc(GFP_NOIO, 1);
87 bio->bi_bdev = bdev->md_bdev;
88 bio->bi_sector = sector;
89 ok = (bio_add_page(bio, page, size, 0) == size);
90 if (!ok)
91 goto out;
92 bio->bi_private = &md_io;
93 bio->bi_end_io = drbd_md_io_complete;
94 bio->bi_rw = rw;
95
b411b363
PR		 96 if (FAULT_ACTIVE(mdev, (rw & WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD))
97 bio_endio(bio, -EIO);
98 else
99 submit_bio(rw, bio);
100 wait_for_completion(&md_io.event);
101 ok = bio_flagged(bio, BIO_UPTODATE) && md_io.error == 0;
102
103 /* check for unsupported barrier op.
104 * would rather check on EOPNOTSUPP, but that is not reliable.
105 * don't try again for ANY return value != 0 */
7b6d91da 106 if (unlikely((bio->bi_rw & REQ_HARDBARRIER) && !ok)) {
b411b363
PR		 107 /* Try again with no barrier */
108 dev_warn(DEV, "Barriers not supported on meta data device - disabling\n");
109 set_bit(MD_NO_BARRIER, &mdev->flags);
7b6d91da 110 rw &= ~REQ_HARDBARRIER;
b411b363
PR		 111 bio_put(bio);
112 goto retry;
113 }
114 out:
115 bio_put(bio);
116 return ok;
117}
118
119int drbd_md_sync_page_io(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
120 sector_t sector, int rw)
121{
122 int logical_block_size, mask, ok;
123 int offset = 0;
124 struct page *iop = mdev->md_io_page;
125
126 D_ASSERT(mutex_is_locked(&mdev->md_io_mutex));
127
128 BUG_ON(!bdev->md_bdev);
129
130 logical_block_size = bdev_logical_block_size(bdev->md_bdev);
131 if (logical_block_size == 0)
132 logical_block_size = MD_SECTOR_SIZE;
133
134 /* in case logical_block_size != 512 [ s390 only? ] */
135 if (logical_block_size != MD_SECTOR_SIZE) {
136 mask = (logical_block_size / MD_SECTOR_SIZE) - 1;
137 D_ASSERT(mask == 1 || mask == 3 || mask == 7);
138 D_ASSERT(logical_block_size == (mask+1) * MD_SECTOR_SIZE);
139 offset = sector & mask;
140 sector = sector & ~mask;
141 iop = mdev->md_io_tmpp;
142
143 if (rw & WRITE) {
144 /* these are GFP_KERNEL pages, pre-allocated
145 * on device initialization */
146 void *p = page_address(mdev->md_io_page);
147 void *hp = page_address(mdev->md_io_tmpp);
148
149 ok = _drbd_md_sync_page_io(mdev, bdev, iop, sector,
150 READ, logical_block_size);
151
152 if (unlikely(!ok)) {
153 dev_err(DEV, "drbd_md_sync_page_io(,%llus,"
154 "READ [logical_block_size!=512]) failed!\n",
155 (unsigned long long)sector);
156 return 0;
157 }
158
159 memcpy(hp + offset*MD_SECTOR_SIZE, p, MD_SECTOR_SIZE);
160 }
161 }
162
163 if (sector < drbd_md_first_sector(bdev) ||
164 sector > drbd_md_last_sector(bdev))
165 dev_alert(DEV, "%s [%d]:%s(,%llus,%s) out of range md access!\n",
166 current->comm, current->pid, __func__,
167 (unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ");
168
169 ok = _drbd_md_sync_page_io(mdev, bdev, iop, sector, rw, logical_block_size);
170 if (unlikely(!ok)) {
171 dev_err(DEV, "drbd_md_sync_page_io(,%llus,%s) failed!\n",
172 (unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ");
173 return 0;
174 }
175
176 if (logical_block_size != MD_SECTOR_SIZE && !(rw & WRITE)) {
177 void *p = page_address(mdev->md_io_page);
178 void *hp = page_address(mdev->md_io_tmpp);
179
180 memcpy(p, hp + offset*MD_SECTOR_SIZE, MD_SECTOR_SIZE);
181 }
182
183 return ok;
184}
185
186static struct lc_element *_al_get(struct drbd_conf *mdev, unsigned int enr)
187{
188 struct lc_element *al_ext;
189 struct lc_element *tmp;
190 unsigned long al_flags = 0;
191
192 spin_lock_irq(&mdev->al_lock);
193 tmp = lc_find(mdev->resync, enr/AL_EXT_PER_BM_SECT);
194 if (unlikely(tmp != NULL)) {
195 struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce);
196 if (test_bit(BME_NO_WRITES, &bm_ext->flags)) {
197 spin_unlock_irq(&mdev->al_lock);
198 return NULL;
199 }
200 }
201 al_ext = lc_get(mdev->act_log, enr);
202 al_flags = mdev->act_log->flags;
203 spin_unlock_irq(&mdev->al_lock);
204
205 /*
206 if (!al_ext) {
207 if (al_flags & LC_STARVING)
208 dev_warn(DEV, "Have to wait for LRU element (AL too small?)\n");
209 if (al_flags & LC_DIRTY)
210 dev_warn(DEV, "Ongoing AL update (AL device too slow?)\n");
211 }
212 */
213
214 return al_ext;
215}
216
217void drbd_al_begin_io(struct drbd_conf *mdev, sector_t sector)
218{
219 unsigned int enr = (sector >> (AL_EXTENT_SHIFT-9));
220 struct lc_element *al_ext;
221 struct update_al_work al_work;
222
223 D_ASSERT(atomic_read(&mdev->local_cnt) > 0);
224
b411b363
PR		 225 wait_event(mdev->al_wait, (al_ext = _al_get(mdev, enr)));
226
227 if (al_ext->lc_number != enr) {
228 /* drbd_al_write_transaction(mdev,al_ext,enr);
229 * recurses into generic_make_request(), which
230 * disallows recursion, bios being serialized on the
231 * current->bio_tail list now.
232 * we have to delegate updates to the activity log
233 * to the worker thread. */
234 init_completion(&al_work.event);
235 al_work.al_ext = al_ext;
236 al_work.enr = enr;
237 al_work.old_enr = al_ext->lc_number;
238 al_work.w.cb = w_al_write_transaction;
239 drbd_queue_work_front(&mdev->data.work, &al_work.w);
240 wait_for_completion(&al_work.event);
241
242 mdev->al_writ_cnt++;
243
244 spin_lock_irq(&mdev->al_lock);
245 lc_changed(mdev->act_log, al_ext);
246 spin_unlock_irq(&mdev->al_lock);
247 wake_up(&mdev->al_wait);
248 }
249}
250
251void drbd_al_complete_io(struct drbd_conf *mdev, sector_t sector)
252{
253 unsigned int enr = (sector >> (AL_EXTENT_SHIFT-9));
254 struct lc_element *extent;
255 unsigned long flags;
256
b411b363
PR		 257 spin_lock_irqsave(&mdev->al_lock, flags);
258
259 extent = lc_find(mdev->act_log, enr);
260
261 if (!extent) {
262 spin_unlock_irqrestore(&mdev->al_lock, flags);
263 dev_err(DEV, "al_complete_io() called on inactive extent %u\n", enr);
264 return;
265 }
266
267 if (lc_put(mdev->act_log, extent) == 0)
268 wake_up(&mdev->al_wait);
269
270 spin_unlock_irqrestore(&mdev->al_lock, flags);
271}
272
273int
274w_al_write_transaction(struct drbd_conf *mdev, struct drbd_work *w, int unused)
275{
276 struct update_al_work *aw = container_of(w, struct update_al_work, w);
277 struct lc_element *updated = aw->al_ext;
278 const unsigned int new_enr = aw->enr;
279 const unsigned int evicted = aw->old_enr;
280 struct al_transaction *buffer;
281 sector_t sector;
282 int i, n, mx;
283 unsigned int extent_nr;
284 u32 xor_sum = 0;
285
286 if (!get_ldev(mdev)) {
287 dev_err(DEV, "get_ldev() failed in w_al_write_transaction\n");
288 complete(&((struct update_al_work *)w)->event);
289 return 1;
290 }
291 /* do we have to do a bitmap write, first?
292 * TODO reduce maximum latency:
293 * submit both bios, then wait for both,
294 * instead of doing two synchronous sector writes. */
295 if (mdev->state.conn < C_CONNECTED && evicted != LC_FREE)
296 drbd_bm_write_sect(mdev, evicted/AL_EXT_PER_BM_SECT);
297
298 mutex_lock(&mdev->md_io_mutex); /* protects md_io_page, al_tr_cycle, ... */
299 buffer = (struct al_transaction *)page_address(mdev->md_io_page);
300
301 buffer->magic = __constant_cpu_to_be32(DRBD_MAGIC);
302 buffer->tr_number = cpu_to_be32(mdev->al_tr_number);
303
304 n = lc_index_of(mdev->act_log, updated);
305
306 buffer->updates[0].pos = cpu_to_be32(n);
307 buffer->updates[0].extent = cpu_to_be32(new_enr);
308
309 xor_sum ^= new_enr;
310
311 mx = min_t(int, AL_EXTENTS_PT,
312 mdev->act_log->nr_elements - mdev->al_tr_cycle);
313 for (i = 0; i < mx; i++) {
314 unsigned idx = mdev->al_tr_cycle + i;
315 extent_nr = lc_element_by_index(mdev->act_log, idx)->lc_number;
316 buffer->updates[i+1].pos = cpu_to_be32(idx);
317 buffer->updates[i+1].extent = cpu_to_be32(extent_nr);
318 xor_sum ^= extent_nr;
319 }
320 for (; i < AL_EXTENTS_PT; i++) {
321 buffer->updates[i+1].pos = __constant_cpu_to_be32(-1);
322 buffer->updates[i+1].extent = __constant_cpu_to_be32(LC_FREE);
323 xor_sum ^= LC_FREE;
324 }
325 mdev->al_tr_cycle += AL_EXTENTS_PT;
326 if (mdev->al_tr_cycle >= mdev->act_log->nr_elements)
327 mdev->al_tr_cycle = 0;
328
329 buffer->xor_sum = cpu_to_be32(xor_sum);
330
331 sector = mdev->ldev->md.md_offset
332 + mdev->ldev->md.al_offset + mdev->al_tr_pos;
333
334 if (!drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE))
335 drbd_chk_io_error(mdev, 1, TRUE);
336
337 if (++mdev->al_tr_pos >
338 div_ceil(mdev->act_log->nr_elements, AL_EXTENTS_PT))
339 mdev->al_tr_pos = 0;
340
341 D_ASSERT(mdev->al_tr_pos < MD_AL_MAX_SIZE);
342 mdev->al_tr_number++;
343
344 mutex_unlock(&mdev->md_io_mutex);
345
346 complete(&((struct update_al_work *)w)->event);
347 put_ldev(mdev);
348
349 return 1;
350}
351
352/**
353 * drbd_al_read_tr() - Read a single transaction from the on disk activity log
354 * @mdev: DRBD device.
355 * @bdev: Block device to read form.
356 * @b: pointer to an al_transaction.
357 * @index: On disk slot of the transaction to read.
358 *
359 * Returns -1 on IO error, 0 on checksum error and 1 upon success.
360 */
361static int drbd_al_read_tr(struct drbd_conf *mdev,
362 struct drbd_backing_dev *bdev,
363 struct al_transaction *b,
364 int index)
365{
366 sector_t sector;
367 int rv, i;
368 u32 xor_sum = 0;
369
370 sector = bdev->md.md_offset + bdev->md.al_offset + index;
371
372 /* Dont process error normally,
373 * as this is done before disk is attached! */
374 if (!drbd_md_sync_page_io(mdev, bdev, sector, READ))
375 return -1;
376
377 rv = (be32_to_cpu(b->magic) == DRBD_MAGIC);
378
379 for (i = 0; i < AL_EXTENTS_PT + 1; i++)
380 xor_sum ^= be32_to_cpu(b->updates[i].extent);
381 rv &= (xor_sum == be32_to_cpu(b->xor_sum));
382
383 return rv;
384}
385
386/**
387 * drbd_al_read_log() - Restores the activity log from its on disk representation.
388 * @mdev: DRBD device.
389 * @bdev: Block device to read form.
390 *
391 * Returns 1 on success, returns 0 when reading the log failed due to IO errors.
392 */
393int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
394{
395 struct al_transaction *buffer;
396 int i;
397 int rv;
398 int mx;
399 int active_extents = 0;
400 int transactions = 0;
401 int found_valid = 0;
402 int from = 0;
403 int to = 0;
404 u32 from_tnr = 0;
405 u32 to_tnr = 0;
406 u32 cnr;
407
408 mx = div_ceil(mdev->act_log->nr_elements, AL_EXTENTS_PT);
409
410 /* lock out all other meta data io for now,
411 * and make sure the page is mapped.
412 */
413 mutex_lock(&mdev->md_io_mutex);
414 buffer = page_address(mdev->md_io_page);
415
416 /* Find the valid transaction in the log */
417 for (i = 0; i <= mx; i++) {
418 rv = drbd_al_read_tr(mdev, bdev, buffer, i);
419 if (rv == 0)
420 continue;
421 if (rv == -1) {
422 mutex_unlock(&mdev->md_io_mutex);
423 return 0;
424 }
425 cnr = be32_to_cpu(buffer->tr_number);
426
427 if (++found_valid == 1) {
428 from = i;
429 to = i;
430 from_tnr = cnr;
431 to_tnr = cnr;
432 continue;
433 }
434 if ((int)cnr - (int)from_tnr < 0) {
435 D_ASSERT(from_tnr - cnr + i - from == mx+1);
436 from = i;
437 from_tnr = cnr;
438 }
439 if ((int)cnr - (int)to_tnr > 0) {
440 D_ASSERT(cnr - to_tnr == i - to);
441 to = i;
442 to_tnr = cnr;
443 }
444 }
445
446 if (!found_valid) {
447 dev_warn(DEV, "No usable activity log found.\n");
448 mutex_unlock(&mdev->md_io_mutex);
449 return 1;
450 }
451
452 /* Read the valid transactions.
453 * dev_info(DEV, "Reading from %d to %d.\n",from,to); */
454 i = from;
455 while (1) {
456 int j, pos;
457 unsigned int extent_nr;
458 unsigned int trn;
459
460 rv = drbd_al_read_tr(mdev, bdev, buffer, i);
461 ERR_IF(rv == 0) goto cancel;
462 if (rv == -1) {
463 mutex_unlock(&mdev->md_io_mutex);
464 return 0;
465 }
466
467 trn = be32_to_cpu(buffer->tr_number);
468
469 spin_lock_irq(&mdev->al_lock);
470
471 /* This loop runs backwards because in the cyclic
472 elements there might be an old version of the
473 updated element (in slot 0). So the element in slot 0
474 can overwrite old versions. */
475 for (j = AL_EXTENTS_PT; j >= 0; j--) {
476 pos = be32_to_cpu(buffer->updates[j].pos);
477 extent_nr = be32_to_cpu(buffer->updates[j].extent);
478
479 if (extent_nr == LC_FREE)
480 continue;
481
482 lc_set(mdev->act_log, extent_nr, pos);
483 active_extents++;
484 }
485 spin_unlock_irq(&mdev->al_lock);
486
487 transactions++;
488
489cancel:
490 if (i == to)
491 break;
492 i++;
493 if (i > mx)
494 i = 0;
495 }
496
497 mdev->al_tr_number = to_tnr+1;
498 mdev->al_tr_pos = to;
499 if (++mdev->al_tr_pos >
500 div_ceil(mdev->act_log->nr_elements, AL_EXTENTS_PT))
501 mdev->al_tr_pos = 0;
502
503 /* ok, we are done with it */
504 mutex_unlock(&mdev->md_io_mutex);
505
506 dev_info(DEV, "Found %d transactions (%d active extents) in activity log.\n",
507 transactions, active_extents);
508
509 return 1;
510}
511
512static void atodb_endio(struct bio *bio, int error)
513{
514 struct drbd_atodb_wait *wc = bio->bi_private;
515 struct drbd_conf *mdev = wc->mdev;
516 struct page *page;
517 int uptodate = bio_flagged(bio, BIO_UPTODATE);
518
519 /* strange behavior of some lower level drivers...
520 * fail the request by clearing the uptodate flag,
521 * but do not return any error?! */
522 if (!error && !uptodate)
523 error = -EIO;
524
525 drbd_chk_io_error(mdev, error, TRUE);
526 if (error && wc->error == 0)
527 wc->error = error;
528
529 if (atomic_dec_and_test(&wc->count))
530 complete(&wc->io_done);
531
532 page = bio->bi_io_vec[0].bv_page;
533 put_page(page);
534 bio_put(bio);
535 mdev->bm_writ_cnt++;
536 put_ldev(mdev);
537}
538
39ad2bbb 539/* sector to word */
b411b363 540#define S2W(s) ((s)<<(BM_EXT_SHIFT-BM_BLOCK_SHIFT-LN2_BPL))
39ad2bbb 541
b411b363
PR		 542/* activity log to on disk bitmap -- prepare bio unless that sector
543 * is already covered by previously prepared bios */
544static int atodb_prepare_unless_covered(struct drbd_conf *mdev,
545 struct bio **bios,
546 unsigned int enr,
547 struct drbd_atodb_wait *wc) __must_hold(local)
548{
549 struct bio *bio;
550 struct page *page;
39ad2bbb 551 sector_t on_disk_sector;
b411b363
PR		 552 unsigned int page_offset = PAGE_SIZE;
553 int offset;
554 int i = 0;
555 int err = -ENOMEM;
556
39ad2bbb
LE		 557 /* We always write aligned, full 4k blocks,
558 * so we can ignore the logical_block_size (for now) */
559 enr &= ~7U;
560 on_disk_sector = enr + mdev->ldev->md.md_offset
561 + mdev->ldev->md.bm_offset;
562
563 D_ASSERT(!(on_disk_sector & 7U));
564
b411b363
PR		 565 /* Check if that enr is already covered by an already created bio.
566 * Caution, bios[] is not NULL terminated,
567 * but only initialized to all NULL.
568 * For completely scattered activity log,
569 * the last invocation iterates over all bios,
570 * and finds the last NULL entry.
571 */
572 while ((bio = bios[i])) {
573 if (bio->bi_sector == on_disk_sector)
574 return 0;
575 i++;
576 }
577 /* bios[i] == NULL, the next not yet used slot */
578
579 /* GFP_KERNEL, we are not in the write-out path */
580 bio = bio_alloc(GFP_KERNEL, 1);
581 if (bio == NULL)
582 return -ENOMEM;
583
584 if (i > 0) {
585 const struct bio_vec *prev_bv = bios[i-1]->bi_io_vec;
586 page_offset = prev_bv->bv_offset + prev_bv->bv_len;
587 page = prev_bv->bv_page;
588 }
589 if (page_offset == PAGE_SIZE) {
590 page = alloc_page(__GFP_HIGHMEM);
591 if (page == NULL)
592 goto out_bio_put;
593 page_offset = 0;
594 } else {
595 get_page(page);
596 }
597
598 offset = S2W(enr);
599 drbd_bm_get_lel(mdev, offset,
39ad2bbb 600 min_t(size_t, S2W(8), drbd_bm_words(mdev) - offset),
b411b363
PR		 601 kmap(page) + page_offset);
602 kunmap(page);
603
604 bio->bi_private = wc;
605 bio->bi_end_io = atodb_endio;
606 bio->bi_bdev = mdev->ldev->md_bdev;
607 bio->bi_sector = on_disk_sector;
608
39ad2bbb 609 if (bio_add_page(bio, page, 4096, page_offset) != 4096)
b411b363
PR		 610 goto out_put_page;
611
612 atomic_inc(&wc->count);
613 /* we already know that we may do this...
614 * get_ldev_if_state(mdev,D_ATTACHING);
615 * just get the extra reference, so that the local_cnt reflects
616 * the number of pending IO requests DRBD at its backing device.
617 */
618 atomic_inc(&mdev->local_cnt);
619
620 bios[i] = bio;
621
622 return 0;
623
624out_put_page:
625 err = -EINVAL;
626 put_page(page);
627out_bio_put:
628 bio_put(bio);
629 return err;
630}
631
632/**
633 * drbd_al_to_on_disk_bm() - * Writes bitmap parts covered by active AL extents
634 * @mdev: DRBD device.
635 *
636 * Called when we detach (unconfigure) local storage,
637 * or when we go from R_PRIMARY to R_SECONDARY role.
638 */
639void drbd_al_to_on_disk_bm(struct drbd_conf *mdev)
640{
641 int i, nr_elements;
642 unsigned int enr;
643 struct bio **bios;
644 struct drbd_atodb_wait wc;
645
646 ERR_IF (!get_ldev_if_state(mdev, D_ATTACHING))
647 return; /* sorry, I don't have any act_log etc... */
648
649 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
650
651 nr_elements = mdev->act_log->nr_elements;
652
653 /* GFP_KERNEL, we are not in anyone's write-out path */
654 bios = kzalloc(sizeof(struct bio *) * nr_elements, GFP_KERNEL);
655 if (!bios)
656 goto submit_one_by_one;
657
658 atomic_set(&wc.count, 0);
659 init_completion(&wc.io_done);
660 wc.mdev = mdev;
661 wc.error = 0;
662
663 for (i = 0; i < nr_elements; i++) {
664 enr = lc_element_by_index(mdev->act_log, i)->lc_number;
665 if (enr == LC_FREE)
666 continue;
667 /* next statement also does atomic_inc wc.count and local_cnt */
668 if (atodb_prepare_unless_covered(mdev, bios,
669 enr/AL_EXT_PER_BM_SECT,
670 &wc))
671 goto free_bios_submit_one_by_one;
672 }
673
674 /* unnecessary optimization? */
675 lc_unlock(mdev->act_log);
676 wake_up(&mdev->al_wait);
677
678 /* all prepared, submit them */
679 for (i = 0; i < nr_elements; i++) {
680 if (bios[i] == NULL)
681 break;
682 if (FAULT_ACTIVE(mdev, DRBD_FAULT_MD_WR)) {
683 bios[i]->bi_rw = WRITE;
684 bio_endio(bios[i], -EIO);
685 } else {
686 submit_bio(WRITE, bios[i]);
687 }
688 }
689
690 drbd_blk_run_queue(bdev_get_queue(mdev->ldev->md_bdev));
691
692 /* always (try to) flush bitmap to stable storage */
693 drbd_md_flush(mdev);
694
695 /* In case we did not submit a single IO do not wait for
696 * them to complete. ( Because we would wait forever here. )
697 *
698 * In case we had IOs and they are already complete, there
699 * is not point in waiting anyways.
700 * Therefore this if () ... */
701 if (atomic_read(&wc.count))
702 wait_for_completion(&wc.io_done);
703
704 put_ldev(mdev);
705
706 kfree(bios);
707 return;
708
709 free_bios_submit_one_by_one:
710 /* free everything by calling the endio callback directly. */
711 for (i = 0; i < nr_elements && bios[i]; i++)
712 bio_endio(bios[i], 0);
713
714 kfree(bios);
715
716 submit_one_by_one:
717 dev_warn(DEV, "Using the slow drbd_al_to_on_disk_bm()\n");
718
719 for (i = 0; i < mdev->act_log->nr_elements; i++) {
720 enr = lc_element_by_index(mdev->act_log, i)->lc_number;
721 if (enr == LC_FREE)
722 continue;
723 /* Really slow: if we have al-extents 16..19 active,
724 * sector 4 will be written four times! Synchronous! */
725 drbd_bm_write_sect(mdev, enr/AL_EXT_PER_BM_SECT);
726 }
727
728 lc_unlock(mdev->act_log);
729 wake_up(&mdev->al_wait);
730 put_ldev(mdev);
731}
732
733/**
734 * drbd_al_apply_to_bm() - Sets the bitmap to diry(1) where covered ba active AL extents
735 * @mdev: DRBD device.
736 */
737void drbd_al_apply_to_bm(struct drbd_conf *mdev)
738{
739 unsigned int enr;
740 unsigned long add = 0;
741 char ppb[10];
742 int i;
743
744 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
745
746 for (i = 0; i < mdev->act_log->nr_elements; i++) {
747 enr = lc_element_by_index(mdev->act_log, i)->lc_number;
748 if (enr == LC_FREE)
749 continue;
750 add += drbd_bm_ALe_set_all(mdev, enr);
751 }
752
753 lc_unlock(mdev->act_log);
754 wake_up(&mdev->al_wait);
755
756 dev_info(DEV, "Marked additional %s as out-of-sync based on AL.\n",
757 ppsize(ppb, Bit2KB(add)));
758}
759
760static int _try_lc_del(struct drbd_conf *mdev, struct lc_element *al_ext)
761{
762 int rv;
763
764 spin_lock_irq(&mdev->al_lock);
765 rv = (al_ext->refcnt == 0);
766 if (likely(rv))
767 lc_del(mdev->act_log, al_ext);
768 spin_unlock_irq(&mdev->al_lock);
769
770 return rv;
771}
772
773/**
774 * drbd_al_shrink() - Removes all active extents form the activity log
775 * @mdev: DRBD device.
776 *
777 * Removes all active extents form the activity log, waiting until
778 * the reference count of each entry dropped to 0 first, of course.
779 *
780 * You need to lock mdev->act_log with lc_try_lock() / lc_unlock()
781 */
782void drbd_al_shrink(struct drbd_conf *mdev)
783{
784 struct lc_element *al_ext;
785 int i;
786
787 D_ASSERT(test_bit(__LC_DIRTY, &mdev->act_log->flags));
788
789 for (i = 0; i < mdev->act_log->nr_elements; i++) {
790 al_ext = lc_element_by_index(mdev->act_log, i);
791 if (al_ext->lc_number == LC_FREE)
792 continue;
793 wait_event(mdev->al_wait, _try_lc_del(mdev, al_ext));
794 }
795
796 wake_up(&mdev->al_wait);
797}
798
799static int w_update_odbm(struct drbd_conf *mdev, struct drbd_work *w, int unused)
800{
801 struct update_odbm_work *udw = container_of(w, struct update_odbm_work, w);
802
803 if (!get_ldev(mdev)) {
804 if (__ratelimit(&drbd_ratelimit_state))
805 dev_warn(DEV, "Can not update on disk bitmap, local IO disabled.\n");
806 kfree(udw);
807 return 1;
808 }
809
810 drbd_bm_write_sect(mdev, udw->enr);
811 put_ldev(mdev);
812
813 kfree(udw);
814
815 if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) {
816 switch (mdev->state.conn) {
817 case C_SYNC_SOURCE: case C_SYNC_TARGET:
818 case C_PAUSED_SYNC_S: case C_PAUSED_SYNC_T:
819 drbd_resync_finished(mdev);
820 default:
821 /* nothing to do */
822 break;
823 }
824 }
825 drbd_bcast_sync_progress(mdev);
826
827 return 1;
828}
829
830
831/* ATTENTION. The AL's extents are 4MB each, while the extents in the
832 * resync LRU-cache are 16MB each.
833 * The caller of this function has to hold an get_ldev() reference.
834 *
835 * TODO will be obsoleted once we have a caching lru of the on disk bitmap
836 */
837static void drbd_try_clear_on_disk_bm(struct drbd_conf *mdev, sector_t sector,
838 int count, int success)
839{
840 struct lc_element *e;
841 struct update_odbm_work *udw;
842
843 unsigned int enr;
844
845 D_ASSERT(atomic_read(&mdev->local_cnt));
846
847 /* I simply assume that a sector/size pair never crosses
848 * a 16 MB extent border. (Currently this is true...) */
849 enr = BM_SECT_TO_EXT(sector);
850
851 e = lc_get(mdev->resync, enr);
852 if (e) {
853 struct bm_extent *ext = lc_entry(e, struct bm_extent, lce);
854 if (ext->lce.lc_number == enr) {
855 if (success)
856 ext->rs_left -= count;
857 else
858 ext->rs_failed += count;
859 if (ext->rs_left < ext->rs_failed) {
860 dev_err(DEV, "BAD! sector=%llus enr=%u rs_left=%d "
861 "rs_failed=%d count=%d\n",
862 (unsigned long long)sector,
863 ext->lce.lc_number, ext->rs_left,
864 ext->rs_failed, count);
865 dump_stack();
866
867 lc_put(mdev->resync, &ext->lce);
868 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
869 return;
870 }
871 } else {
872 /* Normally this element should be in the cache,
873 * since drbd_rs_begin_io() pulled it already in.
874 *
875 * But maybe an application write finished, and we set
876 * something outside the resync lru_cache in sync.
877 */
878 int rs_left = drbd_bm_e_weight(mdev, enr);
879 if (ext->flags != 0) {
880 dev_warn(DEV, "changing resync lce: %d[%u;%02lx]"
881 " -> %d[%u;00]\n",
882 ext->lce.lc_number, ext->rs_left,
883 ext->flags, enr, rs_left);
884 ext->flags = 0;
885 }
886 if (ext->rs_failed) {
887 dev_warn(DEV, "Kicking resync_lru element enr=%u "
888 "out with rs_failed=%d\n",
889 ext->lce.lc_number, ext->rs_failed);
890 set_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags);
891 }
892 ext->rs_left = rs_left;
893 ext->rs_failed = success ? 0 : count;
894 lc_changed(mdev->resync, &ext->lce);
895 }
896 lc_put(mdev->resync, &ext->lce);
897 /* no race, we are within the al_lock! */
898
899 if (ext->rs_left == ext->rs_failed) {
900 ext->rs_failed = 0;
901
902 udw = kmalloc(sizeof(*udw), GFP_ATOMIC);
903 if (udw) {
904 udw->enr = ext->lce.lc_number;
905 udw->w.cb = w_update_odbm;
906 drbd_queue_work_front(&mdev->data.work, &udw->w);
907 } else {
908 dev_warn(DEV, "Could not kmalloc an udw\n");
909 set_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags);
910 }
911 }
912 } else {
913 dev_err(DEV, "lc_get() failed! locked=%d/%d flags=%lu\n",
914 mdev->resync_locked,
915 mdev->resync->nr_elements,
916 mdev->resync->flags);
917 }
918}
919
920/* clear the bit corresponding to the piece of storage in question:
921 * size byte of data starting from sector. Only clear a bits of the affected
922 * one ore more _aligned_ BM_BLOCK_SIZE blocks.
923 *
924 * called by worker on C_SYNC_TARGET and receiver on SyncSource.
925 *
926 */
927void __drbd_set_in_sync(struct drbd_conf *mdev, sector_t sector, int size,
928 const char *file, const unsigned int line)
929{
930 /* Is called from worker and receiver context _only_ */
931 unsigned long sbnr, ebnr, lbnr;
932 unsigned long count = 0;
933 sector_t esector, nr_sectors;
934 int wake_up = 0;
935 unsigned long flags;
936
937 if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) {
938 dev_err(DEV, "drbd_set_in_sync: sector=%llus size=%d nonsense!\n",
939 (unsigned long long)sector, size);
940 return;
941 }
942 nr_sectors = drbd_get_capacity(mdev->this_bdev);
943 esector = sector + (size >> 9) - 1;
944
945 ERR_IF(sector >= nr_sectors) return;
946 ERR_IF(esector >= nr_sectors) esector = (nr_sectors-1);
947
948 lbnr = BM_SECT_TO_BIT(nr_sectors-1);
949
950 /* we clear it (in sync).
951 * round up start sector, round down end sector. we make sure we only
952 * clear full, aligned, BM_BLOCK_SIZE (4K) blocks */
953 if (unlikely(esector < BM_SECT_PER_BIT-1))
954 return;
955 if (unlikely(esector == (nr_sectors-1)))
956 ebnr = lbnr;
957 else
958 ebnr = BM_SECT_TO_BIT(esector - (BM_SECT_PER_BIT-1));
959 sbnr = BM_SECT_TO_BIT(sector + BM_SECT_PER_BIT-1);
960
b411b363
PR		 961 if (sbnr > ebnr)
962 return;
963
964 /*
965 * ok, (capacity & 7) != 0 sometimes, but who cares...
966 * we count rs_{total,left} in bits, not sectors.
967 */
b411b363 968 count = drbd_bm_clear_bits(mdev, sbnr, ebnr);
1d7734a0
LE		 969 if (count && get_ldev(mdev)) {
970 unsigned long now = jiffies;
971 unsigned long last = mdev->rs_mark_time[mdev->rs_last_mark];
972 int next = (mdev->rs_last_mark + 1) % DRBD_SYNC_MARKS;
973 if (time_after_eq(now, last + DRBD_SYNC_MARK_STEP)) {
974 unsigned long tw = drbd_bm_total_weight(mdev);
975 if (mdev->rs_mark_left[mdev->rs_last_mark] != tw &&
b411b363
PR		 976 mdev->state.conn != C_PAUSED_SYNC_T &&
977 mdev->state.conn != C_PAUSED_SYNC_S) {
1d7734a0
LE		 978 mdev->rs_mark_time[next] = now;
979 mdev->rs_mark_left[next] = tw;
980 mdev->rs_last_mark = next;
b411b363
PR		 981 }
982 }
1d7734a0
LE		 983 spin_lock_irqsave(&mdev->al_lock, flags);
984 drbd_try_clear_on_disk_bm(mdev, sector, count, TRUE);
985 spin_unlock_irqrestore(&mdev->al_lock, flags);
986
b411b363
PR		 987 /* just wake_up unconditional now, various lc_chaged(),
988 * lc_put() in drbd_try_clear_on_disk_bm(). */
989 wake_up = 1;
1d7734a0 990 put_ldev(mdev);
b411b363 991 }
b411b363
PR		 992 if (wake_up)
993 wake_up(&mdev->al_wait);
994}
995
996/*
997 * this is intended to set one request worth of data out of sync.
998 * affects at least 1 bit,
999 * and at most 1+DRBD_MAX_SEGMENT_SIZE/BM_BLOCK_SIZE bits.
1000 *
1001 * called by tl_clear and drbd_send_dblock (==drbd_make_request).
1002 * so this can be _any_ process.
1003 */
1004void __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector, int size,
1005 const char *file, const unsigned int line)
1006{
1007 unsigned long sbnr, ebnr, lbnr, flags;
1008 sector_t esector, nr_sectors;
1009 unsigned int enr, count;
1010 struct lc_element *e;
1011
1012 if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) {
1013 dev_err(DEV, "sector: %llus, size: %d\n",
1014 (unsigned long long)sector, size);
1015 return;
1016 }
1017
1018 if (!get_ldev(mdev))
1019 return; /* no disk, no metadata, no bitmap to set bits in */
1020
1021 nr_sectors = drbd_get_capacity(mdev->this_bdev);
1022 esector = sector + (size >> 9) - 1;
1023
1024 ERR_IF(sector >= nr_sectors)
1025 goto out;
1026 ERR_IF(esector >= nr_sectors)
1027 esector = (nr_sectors-1);
1028
1029 lbnr = BM_SECT_TO_BIT(nr_sectors-1);
1030
1031 /* we set it out of sync,
1032 * we do not need to round anything here */
1033 sbnr = BM_SECT_TO_BIT(sector);
1034 ebnr = BM_SECT_TO_BIT(esector);
1035
b411b363
PR		 1036 /* ok, (capacity & 7) != 0 sometimes, but who cares...
1037 * we count rs_{total,left} in bits, not sectors. */
1038 spin_lock_irqsave(&mdev->al_lock, flags);
1039 count = drbd_bm_set_bits(mdev, sbnr, ebnr);
1040
1041 enr = BM_SECT_TO_EXT(sector);
1042 e = lc_find(mdev->resync, enr);
1043 if (e)
1044 lc_entry(e, struct bm_extent, lce)->rs_left += count;
1045 spin_unlock_irqrestore(&mdev->al_lock, flags);
1046
1047out:
1048 put_ldev(mdev);
1049}
1050
1051static
1052struct bm_extent *_bme_get(struct drbd_conf *mdev, unsigned int enr)
1053{
1054 struct lc_element *e;
1055 struct bm_extent *bm_ext;
1056 int wakeup = 0;
1057 unsigned long rs_flags;
1058
1059 spin_lock_irq(&mdev->al_lock);
1060 if (mdev->resync_locked > mdev->resync->nr_elements/2) {
1061 spin_unlock_irq(&mdev->al_lock);
1062 return NULL;
1063 }
1064 e = lc_get(mdev->resync, enr);
1065 bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
1066 if (bm_ext) {
1067 if (bm_ext->lce.lc_number != enr) {
1068 bm_ext->rs_left = drbd_bm_e_weight(mdev, enr);
1069 bm_ext->rs_failed = 0;
1070 lc_changed(mdev->resync, &bm_ext->lce);
1071 wakeup = 1;
1072 }
1073 if (bm_ext->lce.refcnt == 1)
1074 mdev->resync_locked++;
1075 set_bit(BME_NO_WRITES, &bm_ext->flags);
1076 }
1077 rs_flags = mdev->resync->flags;
1078 spin_unlock_irq(&mdev->al_lock);
1079 if (wakeup)
1080 wake_up(&mdev->al_wait);
1081
1082 if (!bm_ext) {
1083 if (rs_flags & LC_STARVING)
1084 dev_warn(DEV, "Have to wait for element"
1085 " (resync LRU too small?)\n");
1086 BUG_ON(rs_flags & LC_DIRTY);
1087 }
1088
1089 return bm_ext;
1090}
1091
1092static int _is_in_al(struct drbd_conf *mdev, unsigned int enr)
1093{
1094 struct lc_element *al_ext;
1095 int rv = 0;
1096
1097 spin_lock_irq(&mdev->al_lock);
1098 if (unlikely(enr == mdev->act_log->new_number))
1099 rv = 1;
1100 else {
1101 al_ext = lc_find(mdev->act_log, enr);
1102 if (al_ext) {
1103 if (al_ext->refcnt)
1104 rv = 1;
1105 }
1106 }
1107 spin_unlock_irq(&mdev->al_lock);
1108
1109 /*
1110 if (unlikely(rv)) {
1111 dev_info(DEV, "Delaying sync read until app's write is done\n");
1112 }
1113 */
1114 return rv;
1115}
1116
1117/**
1118 * drbd_rs_begin_io() - Gets an extent in the resync LRU cache and sets it to BME_LOCKED
1119 * @mdev: DRBD device.
1120 * @sector: The sector number.
1121 *
1122 * This functions sleeps on al_wait. Returns 1 on success, 0 if interrupted.
1123 */
1124int drbd_rs_begin_io(struct drbd_conf *mdev, sector_t sector)
1125{
1126 unsigned int enr = BM_SECT_TO_EXT(sector);
1127 struct bm_extent *bm_ext;
1128 int i, sig;
1129
b411b363
PR		 1130 sig = wait_event_interruptible(mdev->al_wait,
1131 (bm_ext = _bme_get(mdev, enr)));
1132 if (sig)
1133 return 0;
1134
1135 if (test_bit(BME_LOCKED, &bm_ext->flags))
1136 return 1;
1137
1138 for (i = 0; i < AL_EXT_PER_BM_SECT; i++) {
1139 sig = wait_event_interruptible(mdev->al_wait,
1140 !_is_in_al(mdev, enr * AL_EXT_PER_BM_SECT + i));
1141 if (sig) {
1142 spin_lock_irq(&mdev->al_lock);
1143 if (lc_put(mdev->resync, &bm_ext->lce) == 0) {
1144 clear_bit(BME_NO_WRITES, &bm_ext->flags);
1145 mdev->resync_locked--;
1146 wake_up(&mdev->al_wait);
1147 }
1148 spin_unlock_irq(&mdev->al_lock);
1149 return 0;
1150 }
1151 }
1152
1153 set_bit(BME_LOCKED, &bm_ext->flags);
1154
1155 return 1;
1156}
1157
1158/**
1159 * drbd_try_rs_begin_io() - Gets an extent in the resync LRU cache, does not sleep
1160 * @mdev: DRBD device.
1161 * @sector: The sector number.
1162 *
1163 * Gets an extent in the resync LRU cache, sets it to BME_NO_WRITES, then
1164 * tries to set it to BME_LOCKED. Returns 0 upon success, and -EAGAIN
1165 * if there is still application IO going on in this area.
1166 */
1167int drbd_try_rs_begin_io(struct drbd_conf *mdev, sector_t sector)
1168{
1169 unsigned int enr = BM_SECT_TO_EXT(sector);
1170 const unsigned int al_enr = enr*AL_EXT_PER_BM_SECT;
1171 struct lc_element *e;
1172 struct bm_extent *bm_ext;
1173 int i;
1174
b411b363
PR		 1175 spin_lock_irq(&mdev->al_lock);
1176 if (mdev->resync_wenr != LC_FREE && mdev->resync_wenr != enr) {
1177 /* in case you have very heavy scattered io, it may
1178 * stall the syncer undefined if we give up the ref count
1179 * when we try again and requeue.
1180 *
1181 * if we don't give up the refcount, but the next time
1182 * we are scheduled this extent has been "synced" by new
1183 * application writes, we'd miss the lc_put on the
1184 * extent we keep the refcount on.
1185 * so we remembered which extent we had to try again, and
1186 * if the next requested one is something else, we do
1187 * the lc_put here...
1188 * we also have to wake_up
1189 */
b411b363
PR		 1190 e = lc_find(mdev->resync, mdev->resync_wenr);
1191 bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
1192 if (bm_ext) {
1193 D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags));
1194 D_ASSERT(test_bit(BME_NO_WRITES, &bm_ext->flags));
1195 clear_bit(BME_NO_WRITES, &bm_ext->flags);
1196 mdev->resync_wenr = LC_FREE;
1197 if (lc_put(mdev->resync, &bm_ext->lce) == 0)
1198 mdev->resync_locked--;
1199 wake_up(&mdev->al_wait);
1200 } else {
1201 dev_alert(DEV, "LOGIC BUG\n");
1202 }
1203 }
1204 /* TRY. */
1205 e = lc_try_get(mdev->resync, enr);
1206 bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
1207 if (bm_ext) {
1208 if (test_bit(BME_LOCKED, &bm_ext->flags))
1209 goto proceed;
1210 if (!test_and_set_bit(BME_NO_WRITES, &bm_ext->flags)) {
1211 mdev->resync_locked++;
1212 } else {
1213 /* we did set the BME_NO_WRITES,
1214 * but then could not set BME_LOCKED,
1215 * so we tried again.
1216 * drop the extra reference. */
b411b363
PR		 1217 bm_ext->lce.refcnt--;
1218 D_ASSERT(bm_ext->lce.refcnt > 0);
1219 }
1220 goto check_al;
1221 } else {
1222 /* do we rather want to try later? */
6a0afdf5 1223 if (mdev->resync_locked > mdev->resync->nr_elements-3)
b411b363 1224 goto try_again;
b411b363
PR		 1225 /* Do or do not. There is no try. -- Yoda */
1226 e = lc_get(mdev->resync, enr);
1227 bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
1228 if (!bm_ext) {
1229 const unsigned long rs_flags = mdev->resync->flags;
1230 if (rs_flags & LC_STARVING)
1231 dev_warn(DEV, "Have to wait for element"
1232 " (resync LRU too small?)\n");
1233 BUG_ON(rs_flags & LC_DIRTY);
1234 goto try_again;
1235 }
1236 if (bm_ext->lce.lc_number != enr) {
1237 bm_ext->rs_left = drbd_bm_e_weight(mdev, enr);
1238 bm_ext->rs_failed = 0;
1239 lc_changed(mdev->resync, &bm_ext->lce);
1240 wake_up(&mdev->al_wait);
1241 D_ASSERT(test_bit(BME_LOCKED, &bm_ext->flags) == 0);
1242 }
1243 set_bit(BME_NO_WRITES, &bm_ext->flags);
1244 D_ASSERT(bm_ext->lce.refcnt == 1);
1245 mdev->resync_locked++;
1246 goto check_al;
1247 }
1248check_al:
b411b363
PR		 1249 for (i = 0; i < AL_EXT_PER_BM_SECT; i++) {
1250 if (unlikely(al_enr+i == mdev->act_log->new_number))
1251 goto try_again;
1252 if (lc_is_used(mdev->act_log, al_enr+i))
1253 goto try_again;
1254 }
1255 set_bit(BME_LOCKED, &bm_ext->flags);
1256proceed:
1257 mdev->resync_wenr = LC_FREE;
1258 spin_unlock_irq(&mdev->al_lock);
1259 return 0;
1260
1261try_again:
b411b363
PR		 1262 if (bm_ext)
1263 mdev->resync_wenr = enr;
1264 spin_unlock_irq(&mdev->al_lock);
1265 return -EAGAIN;
1266}
1267
1268void drbd_rs_complete_io(struct drbd_conf *mdev, sector_t sector)
1269{
1270 unsigned int enr = BM_SECT_TO_EXT(sector);
1271 struct lc_element *e;
1272 struct bm_extent *bm_ext;
1273 unsigned long flags;
1274
b411b363
PR		 1275 spin_lock_irqsave(&mdev->al_lock, flags);
1276 e = lc_find(mdev->resync, enr);
1277 bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
1278 if (!bm_ext) {
1279 spin_unlock_irqrestore(&mdev->al_lock, flags);
1280 if (__ratelimit(&drbd_ratelimit_state))
1281 dev_err(DEV, "drbd_rs_complete_io() called, but extent not found\n");
1282 return;
1283 }
1284
1285 if (bm_ext->lce.refcnt == 0) {
1286 spin_unlock_irqrestore(&mdev->al_lock, flags);
1287 dev_err(DEV, "drbd_rs_complete_io(,%llu [=%u]) called, "
1288 "but refcnt is 0!?\n",
1289 (unsigned long long)sector, enr);
1290 return;
1291 }
1292
1293 if (lc_put(mdev->resync, &bm_ext->lce) == 0) {
1294 clear_bit(BME_LOCKED, &bm_ext->flags);
1295 clear_bit(BME_NO_WRITES, &bm_ext->flags);
1296 mdev->resync_locked--;
1297 wake_up(&mdev->al_wait);
1298 }
1299
1300 spin_unlock_irqrestore(&mdev->al_lock, flags);
1301}
1302
1303/**
1304 * drbd_rs_cancel_all() - Removes all extents from the resync LRU (even BME_LOCKED)
1305 * @mdev: DRBD device.
1306 */
1307void drbd_rs_cancel_all(struct drbd_conf *mdev)
1308{
b411b363
PR		 1309 spin_lock_irq(&mdev->al_lock);
1310
1311 if (get_ldev_if_state(mdev, D_FAILED)) { /* Makes sure ->resync is there. */
1312 lc_reset(mdev->resync);
1313 put_ldev(mdev);
1314 }
1315 mdev->resync_locked = 0;
1316 mdev->resync_wenr = LC_FREE;
1317 spin_unlock_irq(&mdev->al_lock);
1318 wake_up(&mdev->al_wait);
1319}
1320
1321/**
1322 * drbd_rs_del_all() - Gracefully remove all extents from the resync LRU
1323 * @mdev: DRBD device.
1324 *
1325 * Returns 0 upon success, -EAGAIN if at least one reference count was
1326 * not zero.
1327 */
1328int drbd_rs_del_all(struct drbd_conf *mdev)
1329{
1330 struct lc_element *e;
1331 struct bm_extent *bm_ext;
1332 int i;
1333
b411b363
PR		 1334 spin_lock_irq(&mdev->al_lock);
1335
1336 if (get_ldev_if_state(mdev, D_FAILED)) {
1337 /* ok, ->resync is there. */
1338 for (i = 0; i < mdev->resync->nr_elements; i++) {
1339 e = lc_element_by_index(mdev->resync, i);
b2b163dd 1340 bm_ext = lc_entry(e, struct bm_extent, lce);
b411b363
PR		 1341 if (bm_ext->lce.lc_number == LC_FREE)
1342 continue;
1343 if (bm_ext->lce.lc_number == mdev->resync_wenr) {
1344 dev_info(DEV, "dropping %u in drbd_rs_del_all, apparently"
1345 " got 'synced' by application io\n",
1346 mdev->resync_wenr);
1347 D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags));
1348 D_ASSERT(test_bit(BME_NO_WRITES, &bm_ext->flags));
1349 clear_bit(BME_NO_WRITES, &bm_ext->flags);
1350 mdev->resync_wenr = LC_FREE;
1351 lc_put(mdev->resync, &bm_ext->lce);
1352 }
1353 if (bm_ext->lce.refcnt != 0) {
1354 dev_info(DEV, "Retrying drbd_rs_del_all() later. "
1355 "refcnt=%d\n", bm_ext->lce.refcnt);
1356 put_ldev(mdev);
1357 spin_unlock_irq(&mdev->al_lock);
1358 return -EAGAIN;
1359 }
1360 D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags));
1361 D_ASSERT(!test_bit(BME_NO_WRITES, &bm_ext->flags));
1362 lc_del(mdev->resync, &bm_ext->lce);
1363 }
1364 D_ASSERT(mdev->resync->used == 0);
1365 put_ldev(mdev);
1366 }
1367 spin_unlock_irq(&mdev->al_lock);
1368
1369 return 0;
1370}
1371
1372/**
1373 * drbd_rs_failed_io() - Record information on a failure to resync the specified blocks
1374 * @mdev: DRBD device.
1375 * @sector: The sector number.
1376 * @size: Size of failed IO operation, in byte.
1377 */
1378void drbd_rs_failed_io(struct drbd_conf *mdev, sector_t sector, int size)
1379{
1380 /* Is called from worker and receiver context _only_ */
1381 unsigned long sbnr, ebnr, lbnr;
1382 unsigned long count;
1383 sector_t esector, nr_sectors;
1384 int wake_up = 0;
1385
b411b363
PR		 1386 if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) {
1387 dev_err(DEV, "drbd_rs_failed_io: sector=%llus size=%d nonsense!\n",
1388 (unsigned long long)sector, size);
1389 return;
1390 }
1391 nr_sectors = drbd_get_capacity(mdev->this_bdev);
1392 esector = sector + (size >> 9) - 1;
1393
1394 ERR_IF(sector >= nr_sectors) return;
1395 ERR_IF(esector >= nr_sectors) esector = (nr_sectors-1);
1396
1397 lbnr = BM_SECT_TO_BIT(nr_sectors-1);
1398
1399 /*
1400 * round up start sector, round down end sector. we make sure we only
1401 * handle full, aligned, BM_BLOCK_SIZE (4K) blocks */
1402 if (unlikely(esector < BM_SECT_PER_BIT-1))
1403 return;
1404 if (unlikely(esector == (nr_sectors-1)))
1405 ebnr = lbnr;
1406 else
1407 ebnr = BM_SECT_TO_BIT(esector - (BM_SECT_PER_BIT-1));
1408 sbnr = BM_SECT_TO_BIT(sector + BM_SECT_PER_BIT-1);
1409
1410 if (sbnr > ebnr)
1411 return;
1412
1413 /*
1414 * ok, (capacity & 7) != 0 sometimes, but who cares...
1415 * we count rs_{total,left} in bits, not sectors.
1416 */
1417 spin_lock_irq(&mdev->al_lock);
1418 count = drbd_bm_count_bits(mdev, sbnr, ebnr);
1419 if (count) {
1420 mdev->rs_failed += count;
1421
1422 if (get_ldev(mdev)) {
1423 drbd_try_clear_on_disk_bm(mdev, sector, count, FALSE);
1424 put_ldev(mdev);
1425 }
1426
1427 /* just wake_up unconditional now, various lc_chaged(),
1428 * lc_put() in drbd_try_clear_on_disk_bm(). */
1429 wake_up = 1;
1430 }
1431 spin_unlock_irq(&mdev->al_lock);
1432 if (wake_up)
1433 wake_up(&mdev->al_wait);
1434}
Linux kernel - Deliverables
This page took 0.127901 seconds and 5 git commands to generate.