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btrfs: scrub: errors in tree enumeration
[linux-block.git] / fs / btrfs / scrub.c
CommitLineData
a2de733c
AJ		 1/*
2 * Copyright (C) 2011 STRATO. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#include <linux/sched.h>
20#include <linux/pagemap.h>
21#include <linux/writeback.h>
22#include <linux/blkdev.h>
23#include <linux/rbtree.h>
24#include <linux/slab.h>
25#include <linux/workqueue.h>
26#include "ctree.h"
27#include "volumes.h"
28#include "disk-io.h"
29#include "ordered-data.h"
30
31/*
32 * This is only the first step towards a full-features scrub. It reads all
33 * extent and super block and verifies the checksums. In case a bad checksum
34 * is found or the extent cannot be read, good data will be written back if
35 * any can be found.
36 *
37 * Future enhancements:
38 * - To enhance the performance, better read-ahead strategies for the
39 * extent-tree can be employed.
40 * - In case an unrepairable extent is encountered, track which files are
41 * affected and report them
42 * - In case of a read error on files with nodatasum, map the file and read
43 * the extent to trigger a writeback of the good copy
44 * - track and record media errors, throw out bad devices
a2de733c
AJ		 45 * - add a mode to also read unallocated space
46 * - make the prefetch cancellable
47 */
48
49struct scrub_bio;
50struct scrub_page;
51struct scrub_dev;
a2de733c
AJ		 52static void scrub_bio_end_io(struct bio *bio, int err);
53static void scrub_checksum(struct btrfs_work *work);
54static int scrub_checksum_data(struct scrub_dev *sdev,
55 struct scrub_page *spag, void *buffer);
56static int scrub_checksum_tree_block(struct scrub_dev *sdev,
57 struct scrub_page *spag, u64 logical,
58 void *buffer);
59static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer);
96e36920
ID		 60static int scrub_fixup_check(struct scrub_bio *sbio, int ix);
61static void scrub_fixup_end_io(struct bio *bio, int err);
62static int scrub_fixup_io(int rw, struct block_device *bdev, sector_t sector,
63 struct page *page);
64static void scrub_fixup(struct scrub_bio *sbio, int ix);
a2de733c
AJ		 65
66#define SCRUB_PAGES_PER_BIO 16 /* 64k per bio */
67#define SCRUB_BIOS_PER_DEV 16 /* 1 MB per device in flight */
68
69struct scrub_page {
70 u64 flags; /* extent flags */
71 u64 generation;
72 u64 mirror_num;
73 int have_csum;
74 u8 csum[BTRFS_CSUM_SIZE];
75};
76
77struct scrub_bio {
78 int index;
79 struct scrub_dev *sdev;
80 struct bio *bio;
81 int err;
82 u64 logical;
83 u64 physical;
84 struct scrub_page spag[SCRUB_PAGES_PER_BIO];
85 u64 count;
86 int next_free;
87 struct btrfs_work work;
88};
89
90struct scrub_dev {
91 struct scrub_bio *bios[SCRUB_BIOS_PER_DEV];
92 struct btrfs_device *dev;
93 int first_free;
94 int curr;
95 atomic_t in_flight;
96 spinlock_t list_lock;
97 wait_queue_head_t list_wait;
98 u16 csum_size;
99 struct list_head csum_list;
100 atomic_t cancel_req;
8628764e 101 int readonly;
a2de733c
AJ		 102 /*
103 * statistics
104 */
105 struct btrfs_scrub_progress stat;
106 spinlock_t stat_lock;
107};
108
a2de733c
AJ		 109static void scrub_free_csums(struct scrub_dev *sdev)
110{
111 while (!list_empty(&sdev->csum_list)) {
112 struct btrfs_ordered_sum *sum;
113 sum = list_first_entry(&sdev->csum_list,
114 struct btrfs_ordered_sum, list);
115 list_del(&sum->list);
116 kfree(sum);
117 }
118}
119
1bc87793
AJ		 120static void scrub_free_bio(struct bio *bio)
121{
122 int i;
123 struct page *last_page = NULL;
124
125 if (!bio)
126 return;
127
128 for (i = 0; i < bio->bi_vcnt; ++i) {
129 if (bio->bi_io_vec[i].bv_page == last_page)
130 continue;
131 last_page = bio->bi_io_vec[i].bv_page;
132 __free_page(last_page);
133 }
134 bio_put(bio);
135}
136
a2de733c
AJ		 137static noinline_for_stack void scrub_free_dev(struct scrub_dev *sdev)
138{
139 int i;
a2de733c
AJ		 140
141 if (!sdev)
142 return;
143
144 for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) {
145 struct scrub_bio *sbio = sdev->bios[i];
a2de733c
AJ		 146
147 if (!sbio)
148 break;
149
1bc87793 150 scrub_free_bio(sbio->bio);
a2de733c
AJ		 151 kfree(sbio);
152 }
153
154 scrub_free_csums(sdev);
155 kfree(sdev);
156}
157
158static noinline_for_stack
159struct scrub_dev *scrub_setup_dev(struct btrfs_device *dev)
160{
161 struct scrub_dev *sdev;
162 int i;
a2de733c
AJ		 163 struct btrfs_fs_info *fs_info = dev->dev_root->fs_info;
164
165 sdev = kzalloc(sizeof(*sdev), GFP_NOFS);
166 if (!sdev)
167 goto nomem;
168 sdev->dev = dev;
169 for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) {
a2de733c
AJ		 170 struct scrub_bio *sbio;
171
172 sbio = kzalloc(sizeof(*sbio), GFP_NOFS);
173 if (!sbio)
174 goto nomem;
175 sdev->bios[i] = sbio;
176
a2de733c
AJ		 177 sbio->index = i;
178 sbio->sdev = sdev;
a2de733c
AJ		 179 sbio->count = 0;
180 sbio->work.func = scrub_checksum;
a2de733c
AJ		 181
182 if (i != SCRUB_BIOS_PER_DEV-1)
183 sdev->bios[i]->next_free = i + 1;
184 else
185 sdev->bios[i]->next_free = -1;
186 }
187 sdev->first_free = 0;
188 sdev->curr = -1;
189 atomic_set(&sdev->in_flight, 0);
190 atomic_set(&sdev->cancel_req, 0);
191 sdev->csum_size = btrfs_super_csum_size(&fs_info->super_copy);
192 INIT_LIST_HEAD(&sdev->csum_list);
193
194 spin_lock_init(&sdev->list_lock);
195 spin_lock_init(&sdev->stat_lock);
196 init_waitqueue_head(&sdev->list_wait);
197 return sdev;
198
199nomem:
200 scrub_free_dev(sdev);
201 return ERR_PTR(-ENOMEM);
202}
203
204/*
205 * scrub_recheck_error gets called when either verification of the page
206 * failed or the bio failed to read, e.g. with EIO. In the latter case,
207 * recheck_error gets called for every page in the bio, even though only
208 * one may be bad
209 */
210static void scrub_recheck_error(struct scrub_bio *sbio, int ix)
211{
96e36920
ID		 212 if (sbio->err) {
213 if (scrub_fixup_io(READ, sbio->sdev->dev->bdev,
214 (sbio->physical + ix * PAGE_SIZE) >> 9,
215 sbio->bio->bi_io_vec[ix].bv_page) == 0) {
216 if (scrub_fixup_check(sbio, ix) == 0)
217 return;
218 }
a2de733c
AJ		 219 }
220
96e36920 221 scrub_fixup(sbio, ix);
a2de733c
AJ		 222}
223
96e36920 224static int scrub_fixup_check(struct scrub_bio *sbio, int ix)
a2de733c
AJ		 225{
226 int ret = 1;
227 struct page *page;
228 void *buffer;
96e36920 229 u64 flags = sbio->spag[ix].flags;
a2de733c 230
96e36920 231 page = sbio->bio->bi_io_vec[ix].bv_page;
a2de733c
AJ		 232 buffer = kmap_atomic(page, KM_USER0);
233 if (flags & BTRFS_EXTENT_FLAG_DATA) {
96e36920
ID		 234 ret = scrub_checksum_data(sbio->sdev,
235 sbio->spag + ix, buffer);
a2de733c 236 } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
96e36920
ID		 237 ret = scrub_checksum_tree_block(sbio->sdev,
238 sbio->spag + ix,
239 sbio->logical + ix * PAGE_SIZE,
a2de733c
AJ		 240 buffer);
241 } else {
242 WARN_ON(1);
243 }
244 kunmap_atomic(buffer, KM_USER0);
245
246 return ret;
247}
248
a2de733c
AJ		 249static void scrub_fixup_end_io(struct bio *bio, int err)
250{
251 complete((struct completion *)bio->bi_private);
252}
253
96e36920 254static void scrub_fixup(struct scrub_bio *sbio, int ix)
a2de733c 255{
96e36920 256 struct scrub_dev *sdev = sbio->sdev;
a2de733c
AJ		 257 struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info;
258 struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
259 struct btrfs_multi_bio *multi = NULL;
96e36920 260 u64 logical = sbio->logical + ix * PAGE_SIZE;
a2de733c
AJ		 261 u64 length;
262 int i;
263 int ret;
264 DECLARE_COMPLETION_ONSTACK(complete);
265
96e36920
ID		 266 if ((sbio->spag[ix].flags & BTRFS_EXTENT_FLAG_DATA) &&
267 (sbio->spag[ix].have_csum == 0)) {
a2de733c
AJ		 268 /*
269 * nodatasum, don't try to fix anything
270 * FIXME: we can do better, open the inode and trigger a
271 * writeback
272 */
273 goto uncorrectable;
274 }
275
276 length = PAGE_SIZE;
96e36920 277 ret = btrfs_map_block(map_tree, REQ_WRITE, logical, &length,
a2de733c
AJ		 278 &multi, 0);
279 if (ret || !multi || length < PAGE_SIZE) {
280 printk(KERN_ERR
281 "scrub_fixup: btrfs_map_block failed us for %llu\n",
96e36920 282 (unsigned long long)logical);
a2de733c
AJ		 283 WARN_ON(1);
284 return;
285 }
286
96e36920 287 if (multi->num_stripes == 1)
a2de733c
AJ		 288 /* there aren't any replicas */
289 goto uncorrectable;
a2de733c
AJ		 290
291 /*
292 * first find a good copy
293 */
294 for (i = 0; i < multi->num_stripes; ++i) {
96e36920 295 if (i == sbio->spag[ix].mirror_num)
a2de733c
AJ		 296 continue;
297
96e36920
ID		 298 if (scrub_fixup_io(READ, multi->stripes[i].dev->bdev,
299 multi->stripes[i].physical >> 9,
300 sbio->bio->bi_io_vec[ix].bv_page)) {
a2de733c
AJ		 301 /* I/O-error, this is not a good copy */
302 continue;
96e36920 303 }
a2de733c 304
96e36920 305 if (scrub_fixup_check(sbio, ix) == 0)
a2de733c
AJ		 306 break;
307 }
308 if (i == multi->num_stripes)
309 goto uncorrectable;
310
8628764e
AJ		 311 if (!sdev->readonly) {
312 /*
313 * bi_io_vec[ix].bv_page now contains good data, write it back
314 */
315 if (scrub_fixup_io(WRITE, sdev->dev->bdev,
316 (sbio->physical + ix * PAGE_SIZE) >> 9,
317 sbio->bio->bi_io_vec[ix].bv_page)) {
318 /* I/O-error, writeback failed, give up */
319 goto uncorrectable;
320 }
96e36920 321 }
a2de733c
AJ		 322
323 kfree(multi);
324 spin_lock(&sdev->stat_lock);
325 ++sdev->stat.corrected_errors;
326 spin_unlock(&sdev->stat_lock);
327
328 if (printk_ratelimit())
329 printk(KERN_ERR "btrfs: fixed up at %llu\n",
96e36920 330 (unsigned long long)logical);
a2de733c
AJ		 331 return;
332
333uncorrectable:
334 kfree(multi);
335 spin_lock(&sdev->stat_lock);
336 ++sdev->stat.uncorrectable_errors;
337 spin_unlock(&sdev->stat_lock);
338
339 if (printk_ratelimit())
340 printk(KERN_ERR "btrfs: unable to fixup at %llu\n",
96e36920
ID		 341 (unsigned long long)logical);
342}
343
344static int scrub_fixup_io(int rw, struct block_device *bdev, sector_t sector,
345 struct page *page)
346{
347 struct bio *bio = NULL;
348 int ret;
349 DECLARE_COMPLETION_ONSTACK(complete);
350
96e36920
ID		 351 bio = bio_alloc(GFP_NOFS, 1);
352 bio->bi_bdev = bdev;
353 bio->bi_sector = sector;
354 bio_add_page(bio, page, PAGE_SIZE, 0);
355 bio->bi_end_io = scrub_fixup_end_io;
356 bio->bi_private = &complete;
357 submit_bio(rw, bio);
358
e7786c3a 359 /* this will also unplug the queue */
96e36920
ID		 360 wait_for_completion(&complete);
361
362 ret = !test_bit(BIO_UPTODATE, &bio->bi_flags);
363 bio_put(bio);
364 return ret;
a2de733c
AJ		 365}
366
367static void scrub_bio_end_io(struct bio *bio, int err)
368{
369 struct scrub_bio *sbio = bio->bi_private;
370 struct scrub_dev *sdev = sbio->sdev;
371 struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info;
372
373 sbio->err = err;
1bc87793 374 sbio->bio = bio;
a2de733c
AJ		 375
376 btrfs_queue_worker(&fs_info->scrub_workers, &sbio->work);
377}
378
379static void scrub_checksum(struct btrfs_work *work)
380{
381 struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
382 struct scrub_dev *sdev = sbio->sdev;
383 struct page *page;
384 void *buffer;
385 int i;
386 u64 flags;
387 u64 logical;
388 int ret;
389
390 if (sbio->err) {
a2de733c
AJ		 391 for (i = 0; i < sbio->count; ++i)
392 scrub_recheck_error(sbio, i);
96e36920
ID		 393
394 sbio->bio->bi_flags &= ~(BIO_POOL_MASK - 1);
395 sbio->bio->bi_flags |= 1 << BIO_UPTODATE;
396 sbio->bio->bi_phys_segments = 0;
397 sbio->bio->bi_idx = 0;
398
399 for (i = 0; i < sbio->count; i++) {
400 struct bio_vec *bi;
401 bi = &sbio->bio->bi_io_vec[i];
402 bi->bv_offset = 0;
403 bi->bv_len = PAGE_SIZE;
404 }
405
a2de733c
AJ		 406 spin_lock(&sdev->stat_lock);
407 ++sdev->stat.read_errors;
408 spin_unlock(&sdev->stat_lock);
a2de733c
AJ		 409 goto out;
410 }
411 for (i = 0; i < sbio->count; ++i) {
412 page = sbio->bio->bi_io_vec[i].bv_page;
413 buffer = kmap_atomic(page, KM_USER0);
414 flags = sbio->spag[i].flags;
415 logical = sbio->logical + i * PAGE_SIZE;
416 ret = 0;
417 if (flags & BTRFS_EXTENT_FLAG_DATA) {
418 ret = scrub_checksum_data(sdev, sbio->spag + i, buffer);
419 } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
420 ret = scrub_checksum_tree_block(sdev, sbio->spag + i,
421 logical, buffer);
422 } else if (flags & BTRFS_EXTENT_FLAG_SUPER) {
423 BUG_ON(i);
424 (void)scrub_checksum_super(sbio, buffer);
425 } else {
426 WARN_ON(1);
427 }
428 kunmap_atomic(buffer, KM_USER0);
429 if (ret)
430 scrub_recheck_error(sbio, i);
431 }
432
433out:
1bc87793
AJ		 434 scrub_free_bio(sbio->bio);
435 sbio->bio = NULL;
a2de733c
AJ		 436 spin_lock(&sdev->list_lock);
437 sbio->next_free = sdev->first_free;
438 sdev->first_free = sbio->index;
439 spin_unlock(&sdev->list_lock);
a2de733c
AJ		 440 atomic_dec(&sdev->in_flight);
441 wake_up(&sdev->list_wait);
442}
443
444static int scrub_checksum_data(struct scrub_dev *sdev,
445 struct scrub_page *spag, void *buffer)
446{
447 u8 csum[BTRFS_CSUM_SIZE];
448 u32 crc = ~(u32)0;
449 int fail = 0;
450 struct btrfs_root *root = sdev->dev->dev_root;
451
452 if (!spag->have_csum)
453 return 0;
454
455 crc = btrfs_csum_data(root, buffer, crc, PAGE_SIZE);
456 btrfs_csum_final(crc, csum);
457 if (memcmp(csum, spag->csum, sdev->csum_size))
458 fail = 1;
459
460 spin_lock(&sdev->stat_lock);
461 ++sdev->stat.data_extents_scrubbed;
462 sdev->stat.data_bytes_scrubbed += PAGE_SIZE;
463 if (fail)
464 ++sdev->stat.csum_errors;
465 spin_unlock(&sdev->stat_lock);
466
467 return fail;
468}
469
470static int scrub_checksum_tree_block(struct scrub_dev *sdev,
471 struct scrub_page *spag, u64 logical,
472 void *buffer)
473{
474 struct btrfs_header *h;
475 struct btrfs_root *root = sdev->dev->dev_root;
476 struct btrfs_fs_info *fs_info = root->fs_info;
477 u8 csum[BTRFS_CSUM_SIZE];
478 u32 crc = ~(u32)0;
479 int fail = 0;
480 int crc_fail = 0;
481
482 /*
483 * we don't use the getter functions here, as we
484 * a) don't have an extent buffer and
485 * b) the page is already kmapped
486 */
487 h = (struct btrfs_header *)buffer;
488
489 if (logical != le64_to_cpu(h->bytenr))
490 ++fail;
491
492 if (spag->generation != le64_to_cpu(h->generation))
493 ++fail;
494
495 if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
496 ++fail;
497
498 if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
499 BTRFS_UUID_SIZE))
500 ++fail;
501
502 crc = btrfs_csum_data(root, buffer + BTRFS_CSUM_SIZE, crc,
503 PAGE_SIZE - BTRFS_CSUM_SIZE);
504 btrfs_csum_final(crc, csum);
505 if (memcmp(csum, h->csum, sdev->csum_size))
506 ++crc_fail;
507
508 spin_lock(&sdev->stat_lock);
509 ++sdev->stat.tree_extents_scrubbed;
510 sdev->stat.tree_bytes_scrubbed += PAGE_SIZE;
511 if (crc_fail)
512 ++sdev->stat.csum_errors;
513 if (fail)
514 ++sdev->stat.verify_errors;
515 spin_unlock(&sdev->stat_lock);
516
517 return fail || crc_fail;
518}
519
520static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer)
521{
522 struct btrfs_super_block *s;
523 u64 logical;
524 struct scrub_dev *sdev = sbio->sdev;
525 struct btrfs_root *root = sdev->dev->dev_root;
526 struct btrfs_fs_info *fs_info = root->fs_info;
527 u8 csum[BTRFS_CSUM_SIZE];
528 u32 crc = ~(u32)0;
529 int fail = 0;
530
531 s = (struct btrfs_super_block *)buffer;
532 logical = sbio->logical;
533
534 if (logical != le64_to_cpu(s->bytenr))
535 ++fail;
536
537 if (sbio->spag[0].generation != le64_to_cpu(s->generation))
538 ++fail;
539
540 if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
541 ++fail;
542
543 crc = btrfs_csum_data(root, buffer + BTRFS_CSUM_SIZE, crc,
544 PAGE_SIZE - BTRFS_CSUM_SIZE);
545 btrfs_csum_final(crc, csum);
546 if (memcmp(csum, s->csum, sbio->sdev->csum_size))
547 ++fail;
548
549 if (fail) {
550 /*
551 * if we find an error in a super block, we just report it.
552 * They will get written with the next transaction commit
553 * anyway
554 */
555 spin_lock(&sdev->stat_lock);
556 ++sdev->stat.super_errors;
557 spin_unlock(&sdev->stat_lock);
558 }
559
560 return fail;
561}
562
563static int scrub_submit(struct scrub_dev *sdev)
564{
565 struct scrub_bio *sbio;
1bc87793
AJ		 566 struct bio *bio;
567 int i;
a2de733c
AJ		 568
569 if (sdev->curr == -1)
570 return 0;
571
572 sbio = sdev->bios[sdev->curr];
573
1bc87793
AJ		 574 bio = bio_alloc(GFP_NOFS, sbio->count);
575 if (!bio)
576 goto nomem;
577
578 bio->bi_private = sbio;
579 bio->bi_end_io = scrub_bio_end_io;
580 bio->bi_bdev = sdev->dev->bdev;
581 bio->bi_sector = sbio->physical >> 9;
582
583 for (i = 0; i < sbio->count; ++i) {
584 struct page *page;
585 int ret;
586
587 page = alloc_page(GFP_NOFS);
588 if (!page)
589 goto nomem;
590
591 ret = bio_add_page(bio, page, PAGE_SIZE, 0);
592 if (!ret) {
593 __free_page(page);
594 goto nomem;
595 }
596 }
597
a2de733c
AJ		 598 sbio->err = 0;
599 sdev->curr = -1;
600 atomic_inc(&sdev->in_flight);
601
1bc87793 602 submit_bio(READ, bio);
a2de733c
AJ		 603
604 return 0;
1bc87793
AJ		 605
606nomem:
607 scrub_free_bio(bio);
608
609 return -ENOMEM;
a2de733c
AJ		 610}
611
612static int scrub_page(struct scrub_dev *sdev, u64 logical, u64 len,
613 u64 physical, u64 flags, u64 gen, u64 mirror_num,
614 u8 *csum, int force)
615{
616 struct scrub_bio *sbio;
617
618again:
619 /*
620 * grab a fresh bio or wait for one to become available
621 */
622 while (sdev->curr == -1) {
623 spin_lock(&sdev->list_lock);
624 sdev->curr = sdev->first_free;
625 if (sdev->curr != -1) {
626 sdev->first_free = sdev->bios[sdev->curr]->next_free;
627 sdev->bios[sdev->curr]->next_free = -1;
628 sdev->bios[sdev->curr]->count = 0;
629 spin_unlock(&sdev->list_lock);
630 } else {
631 spin_unlock(&sdev->list_lock);
632 wait_event(sdev->list_wait, sdev->first_free != -1);
633 }
634 }
635 sbio = sdev->bios[sdev->curr];
636 if (sbio->count == 0) {
637 sbio->physical = physical;
638 sbio->logical = logical;
00d01bc1
AJ		 639 } else if (sbio->physical + sbio->count * PAGE_SIZE != physical ||
640 sbio->logical + sbio->count * PAGE_SIZE != logical) {
1bc87793
AJ		 641 int ret;
642
643 ret = scrub_submit(sdev);
644 if (ret)
645 return ret;
a2de733c
AJ		 646 goto again;
647 }
648 sbio->spag[sbio->count].flags = flags;
649 sbio->spag[sbio->count].generation = gen;
650 sbio->spag[sbio->count].have_csum = 0;
651 sbio->spag[sbio->count].mirror_num = mirror_num;
652 if (csum) {
653 sbio->spag[sbio->count].have_csum = 1;
654 memcpy(sbio->spag[sbio->count].csum, csum, sdev->csum_size);
655 }
656 ++sbio->count;
1bc87793
AJ		 657 if (sbio->count == SCRUB_PAGES_PER_BIO || force) {
658 int ret;
659
660 ret = scrub_submit(sdev);
661 if (ret)
662 return ret;
663 }
a2de733c
AJ		 664
665 return 0;
666}
667
668static int scrub_find_csum(struct scrub_dev *sdev, u64 logical, u64 len,
669 u8 *csum)
670{
671 struct btrfs_ordered_sum *sum = NULL;
672 int ret = 0;
673 unsigned long i;
674 unsigned long num_sectors;
675 u32 sectorsize = sdev->dev->dev_root->sectorsize;
676
677 while (!list_empty(&sdev->csum_list)) {
678 sum = list_first_entry(&sdev->csum_list,
679 struct btrfs_ordered_sum, list);
680 if (sum->bytenr > logical)
681 return 0;
682 if (sum->bytenr + sum->len > logical)
683 break;
684
685 ++sdev->stat.csum_discards;
686 list_del(&sum->list);
687 kfree(sum);
688 sum = NULL;
689 }
690 if (!sum)
691 return 0;
692
693 num_sectors = sum->len / sectorsize;
694 for (i = 0; i < num_sectors; ++i) {
695 if (sum->sums[i].bytenr == logical) {
696 memcpy(csum, &sum->sums[i].sum, sdev->csum_size);
697 ret = 1;
698 break;
699 }
700 }
701 if (ret && i == num_sectors - 1) {
702 list_del(&sum->list);
703 kfree(sum);
704 }
705 return ret;
706}
707
708/* scrub extent tries to collect up to 64 kB for each bio */
709static int scrub_extent(struct scrub_dev *sdev, u64 logical, u64 len,
710 u64 physical, u64 flags, u64 gen, u64 mirror_num)
711{
712 int ret;
713 u8 csum[BTRFS_CSUM_SIZE];
714
715 while (len) {
716 u64 l = min_t(u64, len, PAGE_SIZE);
717 int have_csum = 0;
718
719 if (flags & BTRFS_EXTENT_FLAG_DATA) {
720 /* push csums to sbio */
721 have_csum = scrub_find_csum(sdev, logical, l, csum);
722 if (have_csum == 0)
723 ++sdev->stat.no_csum;
724 }
725 ret = scrub_page(sdev, logical, l, physical, flags, gen,
726 mirror_num, have_csum ? csum : NULL, 0);
727 if (ret)
728 return ret;
729 len -= l;
730 logical += l;
731 physical += l;
732 }
733 return 0;
734}
735
736static noinline_for_stack int scrub_stripe(struct scrub_dev *sdev,
737 struct map_lookup *map, int num, u64 base, u64 length)
738{
739 struct btrfs_path *path;
740 struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info;
741 struct btrfs_root *root = fs_info->extent_root;
742 struct btrfs_root *csum_root = fs_info->csum_root;
743 struct btrfs_extent_item *extent;
e7786c3a 744 struct blk_plug plug;
a2de733c
AJ		 745 u64 flags;
746 int ret;
747 int slot;
748 int i;
749 u64 nstripes;
750 int start_stripe;
751 struct extent_buffer *l;
752 struct btrfs_key key;
753 u64 physical;
754 u64 logical;
755 u64 generation;
756 u64 mirror_num;
757
758 u64 increment = map->stripe_len;
759 u64 offset;
760
761 nstripes = length;
762 offset = 0;
763 do_div(nstripes, map->stripe_len);
764 if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
765 offset = map->stripe_len * num;
766 increment = map->stripe_len * map->num_stripes;
767 mirror_num = 0;
768 } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
769 int factor = map->num_stripes / map->sub_stripes;
770 offset = map->stripe_len * (num / map->sub_stripes);
771 increment = map->stripe_len * factor;
772 mirror_num = num % map->sub_stripes;
773 } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
774 increment = map->stripe_len;
775 mirror_num = num % map->num_stripes;
776 } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
777 increment = map->stripe_len;
778 mirror_num = num % map->num_stripes;
779 } else {
780 increment = map->stripe_len;
781 mirror_num = 0;
782 }
783
784 path = btrfs_alloc_path();
785 if (!path)
786 return -ENOMEM;
787
788 path->reada = 2;
789 path->search_commit_root = 1;
790 path->skip_locking = 1;
791
792 /*
793 * find all extents for each stripe and just read them to get
794 * them into the page cache
795 * FIXME: we can do better. build a more intelligent prefetching
796 */
797 logical = base + offset;
798 physical = map->stripes[num].physical;
799 ret = 0;
800 for (i = 0; i < nstripes; ++i) {
801 key.objectid = logical;
802 key.type = BTRFS_EXTENT_ITEM_KEY;
803 key.offset = (u64)0;
804
805 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
806 if (ret < 0)
8c51032f 807 goto out_noplug;
a2de733c 808
8c51032f
AJ		 809 /*
810 * we might miss half an extent here, but that doesn't matter,
811 * as it's only the prefetch
812 */
a2de733c
AJ		 813 while (1) {
814 l = path->nodes[0];
815 slot = path->slots[0];
816 if (slot >= btrfs_header_nritems(l)) {
817 ret = btrfs_next_leaf(root, path);
818 if (ret == 0)
819 continue;
820 if (ret < 0)
8c51032f 821 goto out_noplug;
a2de733c
AJ		 822
823 break;
824 }
825 btrfs_item_key_to_cpu(l, &key, slot);
826
827 if (key.objectid >= logical + map->stripe_len)
828 break;
829
830 path->slots[0]++;
831 }
71267333 832 btrfs_release_path(path);
a2de733c
AJ		 833 logical += increment;
834 physical += map->stripe_len;
835 cond_resched();
836 }
837
838 /*
839 * collect all data csums for the stripe to avoid seeking during
840 * the scrub. This might currently (crc32) end up to be about 1MB
841 */
842 start_stripe = 0;
e7786c3a 843 blk_start_plug(&plug);
a2de733c
AJ		 844again:
845 logical = base + offset + start_stripe * increment;
846 for (i = start_stripe; i < nstripes; ++i) {
847 ret = btrfs_lookup_csums_range(csum_root, logical,
848 logical + map->stripe_len - 1,
849 &sdev->csum_list, 1);
850 if (ret)
851 goto out;
852
853 logical += increment;
854 cond_resched();
855 }
856 /*
857 * now find all extents for each stripe and scrub them
858 */
859 logical = base + offset + start_stripe * increment;
860 physical = map->stripes[num].physical + start_stripe * map->stripe_len;
861 ret = 0;
862 for (i = start_stripe; i < nstripes; ++i) {
863 /*
864 * canceled?
865 */
866 if (atomic_read(&fs_info->scrub_cancel_req) ||
867 atomic_read(&sdev->cancel_req)) {
868 ret = -ECANCELED;
869 goto out;
870 }
871 /*
872 * check to see if we have to pause
873 */
874 if (atomic_read(&fs_info->scrub_pause_req)) {
875 /* push queued extents */
876 scrub_submit(sdev);
877 wait_event(sdev->list_wait,
878 atomic_read(&sdev->in_flight) == 0);
879 atomic_inc(&fs_info->scrubs_paused);
880 wake_up(&fs_info->scrub_pause_wait);
881 mutex_lock(&fs_info->scrub_lock);
882 while (atomic_read(&fs_info->scrub_pause_req)) {
883 mutex_unlock(&fs_info->scrub_lock);
884 wait_event(fs_info->scrub_pause_wait,
885 atomic_read(&fs_info->scrub_pause_req) == 0);
886 mutex_lock(&fs_info->scrub_lock);
887 }
888 atomic_dec(&fs_info->scrubs_paused);
889 mutex_unlock(&fs_info->scrub_lock);
890 wake_up(&fs_info->scrub_pause_wait);
891 scrub_free_csums(sdev);
892 start_stripe = i;
893 goto again;
894 }
895
896 key.objectid = logical;
897 key.type = BTRFS_EXTENT_ITEM_KEY;
898 key.offset = (u64)0;
899
900 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
901 if (ret < 0)
902 goto out;
8c51032f 903 if (ret > 0) {
a2de733c
AJ		 904 ret = btrfs_previous_item(root, path, 0,
905 BTRFS_EXTENT_ITEM_KEY);
906 if (ret < 0)
907 goto out;
8c51032f
AJ		 908 if (ret > 0) {
909 /* there's no smaller item, so stick with the
910 * larger one */
911 btrfs_release_path(path);
912 ret = btrfs_search_slot(NULL, root, &key,
913 path, 0, 0);
914 if (ret < 0)
915 goto out;
916 }
a2de733c
AJ		 917 }
918
919 while (1) {
920 l = path->nodes[0];
921 slot = path->slots[0];
922 if (slot >= btrfs_header_nritems(l)) {
923 ret = btrfs_next_leaf(root, path);
924 if (ret == 0)
925 continue;
926 if (ret < 0)
927 goto out;
928
929 break;
930 }
931 btrfs_item_key_to_cpu(l, &key, slot);
932
933 if (key.objectid + key.offset <= logical)
934 goto next;
935
936 if (key.objectid >= logical + map->stripe_len)
937 break;
938
939 if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY)
940 goto next;
941
942 extent = btrfs_item_ptr(l, slot,
943 struct btrfs_extent_item);
944 flags = btrfs_extent_flags(l, extent);
945 generation = btrfs_extent_generation(l, extent);
946
947 if (key.objectid < logical &&
948 (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) {
949 printk(KERN_ERR
950 "btrfs scrub: tree block %llu spanning "
951 "stripes, ignored. logical=%llu\n",
952 (unsigned long long)key.objectid,
953 (unsigned long long)logical);
954 goto next;
955 }
956
957 /*
958 * trim extent to this stripe
959 */
960 if (key.objectid < logical) {
961 key.offset -= logical - key.objectid;
962 key.objectid = logical;
963 }
964 if (key.objectid + key.offset >
965 logical + map->stripe_len) {
966 key.offset = logical + map->stripe_len -
967 key.objectid;
968 }
969
970 ret = scrub_extent(sdev, key.objectid, key.offset,
971 key.objectid - logical + physical,
972 flags, generation, mirror_num);
973 if (ret)
974 goto out;
975
976next:
977 path->slots[0]++;
978 }
71267333 979 btrfs_release_path(path);
a2de733c
AJ		 980 logical += increment;
981 physical += map->stripe_len;
982 spin_lock(&sdev->stat_lock);
983 sdev->stat.last_physical = physical;
984 spin_unlock(&sdev->stat_lock);
985 }
986 /* push queued extents */
987 scrub_submit(sdev);
988
989out:
e7786c3a 990 blk_finish_plug(&plug);
8c51032f 991out_noplug:
a2de733c
AJ		 992 btrfs_free_path(path);
993 return ret < 0 ? ret : 0;
994}
995
996static noinline_for_stack int scrub_chunk(struct scrub_dev *sdev,
997 u64 chunk_tree, u64 chunk_objectid, u64 chunk_offset, u64 length)
998{
999 struct btrfs_mapping_tree *map_tree =
1000 &sdev->dev->dev_root->fs_info->mapping_tree;
1001 struct map_lookup *map;
1002 struct extent_map *em;
1003 int i;
1004 int ret = -EINVAL;
1005
1006 read_lock(&map_tree->map_tree.lock);
1007 em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
1008 read_unlock(&map_tree->map_tree.lock);
1009
1010 if (!em)
1011 return -EINVAL;
1012
1013 map = (struct map_lookup *)em->bdev;
1014 if (em->start != chunk_offset)
1015 goto out;
1016
1017 if (em->len < length)
1018 goto out;
1019
1020 for (i = 0; i < map->num_stripes; ++i) {
1021 if (map->stripes[i].dev == sdev->dev) {
1022 ret = scrub_stripe(sdev, map, i, chunk_offset, length);
1023 if (ret)
1024 goto out;
1025 }
1026 }
1027out:
1028 free_extent_map(em);
1029
1030 return ret;
1031}
1032
1033static noinline_for_stack
1034int scrub_enumerate_chunks(struct scrub_dev *sdev, u64 start, u64 end)
1035{
1036 struct btrfs_dev_extent *dev_extent = NULL;
1037 struct btrfs_path *path;
1038 struct btrfs_root *root = sdev->dev->dev_root;
1039 struct btrfs_fs_info *fs_info = root->fs_info;
1040 u64 length;
1041 u64 chunk_tree;
1042 u64 chunk_objectid;
1043 u64 chunk_offset;
1044 int ret;
1045 int slot;
1046 struct extent_buffer *l;
1047 struct btrfs_key key;
1048 struct btrfs_key found_key;
1049 struct btrfs_block_group_cache *cache;
1050
1051 path = btrfs_alloc_path();
1052 if (!path)
1053 return -ENOMEM;
1054
1055 path->reada = 2;
1056 path->search_commit_root = 1;
1057 path->skip_locking = 1;
1058
1059 key.objectid = sdev->dev->devid;
1060 key.offset = 0ull;
1061 key.type = BTRFS_DEV_EXTENT_KEY;
1062
1063
1064 while (1) {
1065 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1066 if (ret < 0)
8c51032f
AJ		 1067 break;
1068 if (ret > 0) {
1069 if (path->slots[0] >=
1070 btrfs_header_nritems(path->nodes[0])) {
1071 ret = btrfs_next_leaf(root, path);
1072 if (ret)
1073 break;
1074 }
1075 }
a2de733c
AJ		 1076
1077 l = path->nodes[0];
1078 slot = path->slots[0];
1079
1080 btrfs_item_key_to_cpu(l, &found_key, slot);
1081
1082 if (found_key.objectid != sdev->dev->devid)
1083 break;
1084
8c51032f 1085 if (btrfs_key_type(&found_key) != BTRFS_DEV_EXTENT_KEY)
a2de733c
AJ		 1086 break;
1087
1088 if (found_key.offset >= end)
1089 break;
1090
1091 if (found_key.offset < key.offset)
1092 break;
1093
1094 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
1095 length = btrfs_dev_extent_length(l, dev_extent);
1096
1097 if (found_key.offset + length <= start) {
1098 key.offset = found_key.offset + length;
71267333 1099 btrfs_release_path(path);
a2de733c
AJ		 1100 continue;
1101 }
1102
1103 chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent);
1104 chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent);
1105 chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
1106
1107 /*
1108 * get a reference on the corresponding block group to prevent
1109 * the chunk from going away while we scrub it
1110 */
1111 cache = btrfs_lookup_block_group(fs_info, chunk_offset);
1112 if (!cache) {
1113 ret = -ENOENT;
8c51032f 1114 break;
a2de733c
AJ		 1115 }
1116 ret = scrub_chunk(sdev, chunk_tree, chunk_objectid,
1117 chunk_offset, length);
1118 btrfs_put_block_group(cache);
1119 if (ret)
1120 break;
1121
1122 key.offset = found_key.offset + length;
71267333 1123 btrfs_release_path(path);
a2de733c
AJ		 1124 }
1125
a2de733c 1126 btrfs_free_path(path);
8c51032f
AJ		 1127
1128 /*
1129 * ret can still be 1 from search_slot or next_leaf,
1130 * that's not an error
1131 */
1132 return ret < 0 ? ret : 0;
a2de733c
AJ		 1133}
1134
1135static noinline_for_stack int scrub_supers(struct scrub_dev *sdev)
1136{
1137 int i;
1138 u64 bytenr;
1139 u64 gen;
1140 int ret;
1141 struct btrfs_device *device = sdev->dev;
1142 struct btrfs_root *root = device->dev_root;
1143
1144 gen = root->fs_info->last_trans_committed;
1145
1146 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1147 bytenr = btrfs_sb_offset(i);
1148 if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
1149 break;
1150
1151 ret = scrub_page(sdev, bytenr, PAGE_SIZE, bytenr,
1152 BTRFS_EXTENT_FLAG_SUPER, gen, i, NULL, 1);
1153 if (ret)
1154 return ret;
1155 }
1156 wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0);
1157
1158 return 0;
1159}
1160
1161/*
1162 * get a reference count on fs_info->scrub_workers. start worker if necessary
1163 */
1164static noinline_for_stack int scrub_workers_get(struct btrfs_root *root)
1165{
1166 struct btrfs_fs_info *fs_info = root->fs_info;
1167
1168 mutex_lock(&fs_info->scrub_lock);
1169 if (fs_info->scrub_workers_refcnt == 0)
1170 btrfs_start_workers(&fs_info->scrub_workers, 1);
1171 ++fs_info->scrub_workers_refcnt;
1172 mutex_unlock(&fs_info->scrub_lock);
1173
1174 return 0;
1175}
1176
1177static noinline_for_stack void scrub_workers_put(struct btrfs_root *root)
1178{
1179 struct btrfs_fs_info *fs_info = root->fs_info;
1180
1181 mutex_lock(&fs_info->scrub_lock);
1182 if (--fs_info->scrub_workers_refcnt == 0)
1183 btrfs_stop_workers(&fs_info->scrub_workers);
1184 WARN_ON(fs_info->scrub_workers_refcnt < 0);
1185 mutex_unlock(&fs_info->scrub_lock);
1186}
1187
1188
1189int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
8628764e 1190 struct btrfs_scrub_progress *progress, int readonly)
a2de733c
AJ		 1191{
1192 struct scrub_dev *sdev;
1193 struct btrfs_fs_info *fs_info = root->fs_info;
1194 int ret;
1195 struct btrfs_device *dev;
1196
7841cb28 1197 if (btrfs_fs_closing(root->fs_info))
a2de733c
AJ		 1198 return -EINVAL;
1199
1200 /*
1201 * check some assumptions
1202 */
1203 if (root->sectorsize != PAGE_SIZE ||
1204 root->sectorsize != root->leafsize ||
1205 root->sectorsize != root->nodesize) {
1206 printk(KERN_ERR "btrfs_scrub: size assumptions fail\n");
1207 return -EINVAL;
1208 }
1209
1210 ret = scrub_workers_get(root);
1211 if (ret)
1212 return ret;
1213
1214 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
1215 dev = btrfs_find_device(root, devid, NULL, NULL);
1216 if (!dev || dev->missing) {
1217 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1218 scrub_workers_put(root);
1219 return -ENODEV;
1220 }
1221 mutex_lock(&fs_info->scrub_lock);
1222
1223 if (!dev->in_fs_metadata) {
1224 mutex_unlock(&fs_info->scrub_lock);
1225 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1226 scrub_workers_put(root);
1227 return -ENODEV;
1228 }
1229
1230 if (dev->scrub_device) {
1231 mutex_unlock(&fs_info->scrub_lock);
1232 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1233 scrub_workers_put(root);
1234 return -EINPROGRESS;
1235 }
1236 sdev = scrub_setup_dev(dev);
1237 if (IS_ERR(sdev)) {
1238 mutex_unlock(&fs_info->scrub_lock);
1239 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1240 scrub_workers_put(root);
1241 return PTR_ERR(sdev);
1242 }
8628764e 1243 sdev->readonly = readonly;
a2de733c
AJ		 1244 dev->scrub_device = sdev;
1245
1246 atomic_inc(&fs_info->scrubs_running);
1247 mutex_unlock(&fs_info->scrub_lock);
1248 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1249
1250 down_read(&fs_info->scrub_super_lock);
1251 ret = scrub_supers(sdev);
1252 up_read(&fs_info->scrub_super_lock);
1253
1254 if (!ret)
1255 ret = scrub_enumerate_chunks(sdev, start, end);
1256
1257 wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0);
1258
1259 atomic_dec(&fs_info->scrubs_running);
1260 wake_up(&fs_info->scrub_pause_wait);
1261
1262 if (progress)
1263 memcpy(progress, &sdev->stat, sizeof(*progress));
1264
1265 mutex_lock(&fs_info->scrub_lock);
1266 dev->scrub_device = NULL;
1267 mutex_unlock(&fs_info->scrub_lock);
1268
1269 scrub_free_dev(sdev);
1270 scrub_workers_put(root);
1271
1272 return ret;
1273}
1274
1275int btrfs_scrub_pause(struct btrfs_root *root)
1276{
1277 struct btrfs_fs_info *fs_info = root->fs_info;
1278
1279 mutex_lock(&fs_info->scrub_lock);
1280 atomic_inc(&fs_info->scrub_pause_req);
1281 while (atomic_read(&fs_info->scrubs_paused) !=
1282 atomic_read(&fs_info->scrubs_running)) {
1283 mutex_unlock(&fs_info->scrub_lock);
1284 wait_event(fs_info->scrub_pause_wait,
1285 atomic_read(&fs_info->scrubs_paused) ==
1286 atomic_read(&fs_info->scrubs_running));
1287 mutex_lock(&fs_info->scrub_lock);
1288 }
1289 mutex_unlock(&fs_info->scrub_lock);
1290
1291 return 0;
1292}
1293
1294int btrfs_scrub_continue(struct btrfs_root *root)
1295{
1296 struct btrfs_fs_info *fs_info = root->fs_info;
1297
1298 atomic_dec(&fs_info->scrub_pause_req);
1299 wake_up(&fs_info->scrub_pause_wait);
1300 return 0;
1301}
1302
1303int btrfs_scrub_pause_super(struct btrfs_root *root)
1304{
1305 down_write(&root->fs_info->scrub_super_lock);
1306 return 0;
1307}
1308
1309int btrfs_scrub_continue_super(struct btrfs_root *root)
1310{
1311 up_write(&root->fs_info->scrub_super_lock);
1312 return 0;
1313}
1314
1315int btrfs_scrub_cancel(struct btrfs_root *root)
1316{
1317 struct btrfs_fs_info *fs_info = root->fs_info;
1318
1319 mutex_lock(&fs_info->scrub_lock);
1320 if (!atomic_read(&fs_info->scrubs_running)) {
1321 mutex_unlock(&fs_info->scrub_lock);
1322 return -ENOTCONN;
1323 }
1324
1325 atomic_inc(&fs_info->scrub_cancel_req);
1326 while (atomic_read(&fs_info->scrubs_running)) {
1327 mutex_unlock(&fs_info->scrub_lock);
1328 wait_event(fs_info->scrub_pause_wait,
1329 atomic_read(&fs_info->scrubs_running) == 0);
1330 mutex_lock(&fs_info->scrub_lock);
1331 }
1332 atomic_dec(&fs_info->scrub_cancel_req);
1333 mutex_unlock(&fs_info->scrub_lock);
1334
1335 return 0;
1336}
1337
1338int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev)
1339{
1340 struct btrfs_fs_info *fs_info = root->fs_info;
1341 struct scrub_dev *sdev;
1342
1343 mutex_lock(&fs_info->scrub_lock);
1344 sdev = dev->scrub_device;
1345 if (!sdev) {
1346 mutex_unlock(&fs_info->scrub_lock);
1347 return -ENOTCONN;
1348 }
1349 atomic_inc(&sdev->cancel_req);
1350 while (dev->scrub_device) {
1351 mutex_unlock(&fs_info->scrub_lock);
1352 wait_event(fs_info->scrub_pause_wait,
1353 dev->scrub_device == NULL);
1354 mutex_lock(&fs_info->scrub_lock);
1355 }
1356 mutex_unlock(&fs_info->scrub_lock);
1357
1358 return 0;
1359}
1360int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid)
1361{
1362 struct btrfs_fs_info *fs_info = root->fs_info;
1363 struct btrfs_device *dev;
1364 int ret;
1365
1366 /*
1367 * we have to hold the device_list_mutex here so the device
1368 * does not go away in cancel_dev. FIXME: find a better solution
1369 */
1370 mutex_lock(&fs_info->fs_devices->device_list_mutex);
1371 dev = btrfs_find_device(root, devid, NULL, NULL);
1372 if (!dev) {
1373 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
1374 return -ENODEV;
1375 }
1376 ret = btrfs_scrub_cancel_dev(root, dev);
1377 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
1378
1379 return ret;
1380}
1381
1382int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
1383 struct btrfs_scrub_progress *progress)
1384{
1385 struct btrfs_device *dev;
1386 struct scrub_dev *sdev = NULL;
1387
1388 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
1389 dev = btrfs_find_device(root, devid, NULL, NULL);
1390 if (dev)
1391 sdev = dev->scrub_device;
1392 if (sdev)
1393 memcpy(progress, &sdev->stat, sizeof(*progress));
1394 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
1395
1396 return dev ? (sdev ? 0 : -ENOTCONN) : -ENODEV;
1397}
Linux 6.x block layer and io_uring tree(s)