diff options
author | Chris Mason <chris.mason@oracle.com> | 2011-05-23 06:30:52 -0400 |
---|---|---|
committer | Chris Mason <chris.mason@oracle.com> | 2011-05-23 06:30:52 -0400 |
commit | 712673339a0d085358fd1cd3a6477cc7979bb69f (patch) | |
tree | b2e268685e3cbba19a4adb2a47d853e4e461fcfc /fs/btrfs/scrub.c | |
parent | aa2dfb372a2a647beedac163ce6f8b0fcbefac29 (diff) | |
parent | 8628764e1a5e1998a42b9713e9edea7753653d01 (diff) |
Merge branch 'for-chris' of git://git.kernel.org/pub/scm/linux/kernel/git/arne/btrfs-unstable-arne into inode_numbers
Conflicts:
fs/btrfs/Makefile
fs/btrfs/ctree.h
fs/btrfs/volumes.h
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/scrub.c')
-rw-r--r-- | fs/btrfs/scrub.c | 1368 |
1 files changed, 1368 insertions, 0 deletions
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c new file mode 100644 index 000000000000..87a2f1273136 --- /dev/null +++ b/fs/btrfs/scrub.c | |||
@@ -0,0 +1,1368 @@ | |||
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 | ||
45 | * - add a mode to also read unallocated space | ||
46 | * - make the prefetch cancellable | ||
47 | */ | ||
48 | |||
49 | struct scrub_bio; | ||
50 | struct scrub_page; | ||
51 | struct scrub_dev; | ||
52 | static void scrub_bio_end_io(struct bio *bio, int err); | ||
53 | static void scrub_checksum(struct btrfs_work *work); | ||
54 | static int scrub_checksum_data(struct scrub_dev *sdev, | ||
55 | struct scrub_page *spag, void *buffer); | ||
56 | static int scrub_checksum_tree_block(struct scrub_dev *sdev, | ||
57 | struct scrub_page *spag, u64 logical, | ||
58 | void *buffer); | ||
59 | static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer); | ||
60 | static int scrub_fixup_check(struct scrub_bio *sbio, int ix); | ||
61 | static void scrub_fixup_end_io(struct bio *bio, int err); | ||
62 | static int scrub_fixup_io(int rw, struct block_device *bdev, sector_t sector, | ||
63 | struct page *page); | ||
64 | static void scrub_fixup(struct scrub_bio *sbio, int ix); | ||
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 | |||
69 | struct 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 | |||
77 | struct 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 | |||
90 | struct 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; | ||
101 | int readonly; | ||
102 | /* | ||
103 | * statistics | ||
104 | */ | ||
105 | struct btrfs_scrub_progress stat; | ||
106 | spinlock_t stat_lock; | ||
107 | }; | ||
108 | |||
109 | static 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 | |||
120 | static noinline_for_stack void scrub_free_dev(struct scrub_dev *sdev) | ||
121 | { | ||
122 | int i; | ||
123 | int j; | ||
124 | struct page *last_page; | ||
125 | |||
126 | if (!sdev) | ||
127 | return; | ||
128 | |||
129 | for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) { | ||
130 | struct scrub_bio *sbio = sdev->bios[i]; | ||
131 | struct bio *bio; | ||
132 | |||
133 | if (!sbio) | ||
134 | break; | ||
135 | |||
136 | bio = sbio->bio; | ||
137 | if (bio) { | ||
138 | last_page = NULL; | ||
139 | for (j = 0; j < bio->bi_vcnt; ++j) { | ||
140 | if (bio->bi_io_vec[j].bv_page == last_page) | ||
141 | continue; | ||
142 | last_page = bio->bi_io_vec[j].bv_page; | ||
143 | __free_page(last_page); | ||
144 | } | ||
145 | bio_put(bio); | ||
146 | } | ||
147 | kfree(sbio); | ||
148 | } | ||
149 | |||
150 | scrub_free_csums(sdev); | ||
151 | kfree(sdev); | ||
152 | } | ||
153 | |||
154 | static noinline_for_stack | ||
155 | struct scrub_dev *scrub_setup_dev(struct btrfs_device *dev) | ||
156 | { | ||
157 | struct scrub_dev *sdev; | ||
158 | int i; | ||
159 | int j; | ||
160 | int ret; | ||
161 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; | ||
162 | |||
163 | sdev = kzalloc(sizeof(*sdev), GFP_NOFS); | ||
164 | if (!sdev) | ||
165 | goto nomem; | ||
166 | sdev->dev = dev; | ||
167 | for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) { | ||
168 | struct bio *bio; | ||
169 | struct scrub_bio *sbio; | ||
170 | |||
171 | sbio = kzalloc(sizeof(*sbio), GFP_NOFS); | ||
172 | if (!sbio) | ||
173 | goto nomem; | ||
174 | sdev->bios[i] = sbio; | ||
175 | |||
176 | bio = bio_kmalloc(GFP_NOFS, SCRUB_PAGES_PER_BIO); | ||
177 | if (!bio) | ||
178 | goto nomem; | ||
179 | |||
180 | sbio->index = i; | ||
181 | sbio->sdev = sdev; | ||
182 | sbio->bio = bio; | ||
183 | sbio->count = 0; | ||
184 | sbio->work.func = scrub_checksum; | ||
185 | bio->bi_private = sdev->bios[i]; | ||
186 | bio->bi_end_io = scrub_bio_end_io; | ||
187 | bio->bi_sector = 0; | ||
188 | bio->bi_bdev = dev->bdev; | ||
189 | bio->bi_size = 0; | ||
190 | |||
191 | for (j = 0; j < SCRUB_PAGES_PER_BIO; ++j) { | ||
192 | struct page *page; | ||
193 | page = alloc_page(GFP_NOFS); | ||
194 | if (!page) | ||
195 | goto nomem; | ||
196 | |||
197 | ret = bio_add_page(bio, page, PAGE_SIZE, 0); | ||
198 | if (!ret) | ||
199 | goto nomem; | ||
200 | } | ||
201 | WARN_ON(bio->bi_vcnt != SCRUB_PAGES_PER_BIO); | ||
202 | |||
203 | if (i != SCRUB_BIOS_PER_DEV-1) | ||
204 | sdev->bios[i]->next_free = i + 1; | ||
205 | else | ||
206 | sdev->bios[i]->next_free = -1; | ||
207 | } | ||
208 | sdev->first_free = 0; | ||
209 | sdev->curr = -1; | ||
210 | atomic_set(&sdev->in_flight, 0); | ||
211 | atomic_set(&sdev->cancel_req, 0); | ||
212 | sdev->csum_size = btrfs_super_csum_size(&fs_info->super_copy); | ||
213 | INIT_LIST_HEAD(&sdev->csum_list); | ||
214 | |||
215 | spin_lock_init(&sdev->list_lock); | ||
216 | spin_lock_init(&sdev->stat_lock); | ||
217 | init_waitqueue_head(&sdev->list_wait); | ||
218 | return sdev; | ||
219 | |||
220 | nomem: | ||
221 | scrub_free_dev(sdev); | ||
222 | return ERR_PTR(-ENOMEM); | ||
223 | } | ||
224 | |||
225 | /* | ||
226 | * scrub_recheck_error gets called when either verification of the page | ||
227 | * failed or the bio failed to read, e.g. with EIO. In the latter case, | ||
228 | * recheck_error gets called for every page in the bio, even though only | ||
229 | * one may be bad | ||
230 | */ | ||
231 | static void scrub_recheck_error(struct scrub_bio *sbio, int ix) | ||
232 | { | ||
233 | if (sbio->err) { | ||
234 | if (scrub_fixup_io(READ, sbio->sdev->dev->bdev, | ||
235 | (sbio->physical + ix * PAGE_SIZE) >> 9, | ||
236 | sbio->bio->bi_io_vec[ix].bv_page) == 0) { | ||
237 | if (scrub_fixup_check(sbio, ix) == 0) | ||
238 | return; | ||
239 | } | ||
240 | } | ||
241 | |||
242 | scrub_fixup(sbio, ix); | ||
243 | } | ||
244 | |||
245 | static int scrub_fixup_check(struct scrub_bio *sbio, int ix) | ||
246 | { | ||
247 | int ret = 1; | ||
248 | struct page *page; | ||
249 | void *buffer; | ||
250 | u64 flags = sbio->spag[ix].flags; | ||
251 | |||
252 | page = sbio->bio->bi_io_vec[ix].bv_page; | ||
253 | buffer = kmap_atomic(page, KM_USER0); | ||
254 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | ||
255 | ret = scrub_checksum_data(sbio->sdev, | ||
256 | sbio->spag + ix, buffer); | ||
257 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | ||
258 | ret = scrub_checksum_tree_block(sbio->sdev, | ||
259 | sbio->spag + ix, | ||
260 | sbio->logical + ix * PAGE_SIZE, | ||
261 | buffer); | ||
262 | } else { | ||
263 | WARN_ON(1); | ||
264 | } | ||
265 | kunmap_atomic(buffer, KM_USER0); | ||
266 | |||
267 | return ret; | ||
268 | } | ||
269 | |||
270 | static void scrub_fixup_end_io(struct bio *bio, int err) | ||
271 | { | ||
272 | complete((struct completion *)bio->bi_private); | ||
273 | } | ||
274 | |||
275 | static void scrub_fixup(struct scrub_bio *sbio, int ix) | ||
276 | { | ||
277 | struct scrub_dev *sdev = sbio->sdev; | ||
278 | struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info; | ||
279 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; | ||
280 | struct btrfs_multi_bio *multi = NULL; | ||
281 | u64 logical = sbio->logical + ix * PAGE_SIZE; | ||
282 | u64 length; | ||
283 | int i; | ||
284 | int ret; | ||
285 | DECLARE_COMPLETION_ONSTACK(complete); | ||
286 | |||
287 | if ((sbio->spag[ix].flags & BTRFS_EXTENT_FLAG_DATA) && | ||
288 | (sbio->spag[ix].have_csum == 0)) { | ||
289 | /* | ||
290 | * nodatasum, don't try to fix anything | ||
291 | * FIXME: we can do better, open the inode and trigger a | ||
292 | * writeback | ||
293 | */ | ||
294 | goto uncorrectable; | ||
295 | } | ||
296 | |||
297 | length = PAGE_SIZE; | ||
298 | ret = btrfs_map_block(map_tree, REQ_WRITE, logical, &length, | ||
299 | &multi, 0); | ||
300 | if (ret || !multi || length < PAGE_SIZE) { | ||
301 | printk(KERN_ERR | ||
302 | "scrub_fixup: btrfs_map_block failed us for %llu\n", | ||
303 | (unsigned long long)logical); | ||
304 | WARN_ON(1); | ||
305 | return; | ||
306 | } | ||
307 | |||
308 | if (multi->num_stripes == 1) | ||
309 | /* there aren't any replicas */ | ||
310 | goto uncorrectable; | ||
311 | |||
312 | /* | ||
313 | * first find a good copy | ||
314 | */ | ||
315 | for (i = 0; i < multi->num_stripes; ++i) { | ||
316 | if (i == sbio->spag[ix].mirror_num) | ||
317 | continue; | ||
318 | |||
319 | if (scrub_fixup_io(READ, multi->stripes[i].dev->bdev, | ||
320 | multi->stripes[i].physical >> 9, | ||
321 | sbio->bio->bi_io_vec[ix].bv_page)) { | ||
322 | /* I/O-error, this is not a good copy */ | ||
323 | continue; | ||
324 | } | ||
325 | |||
326 | if (scrub_fixup_check(sbio, ix) == 0) | ||
327 | break; | ||
328 | } | ||
329 | if (i == multi->num_stripes) | ||
330 | goto uncorrectable; | ||
331 | |||
332 | if (!sdev->readonly) { | ||
333 | /* | ||
334 | * bi_io_vec[ix].bv_page now contains good data, write it back | ||
335 | */ | ||
336 | if (scrub_fixup_io(WRITE, sdev->dev->bdev, | ||
337 | (sbio->physical + ix * PAGE_SIZE) >> 9, | ||
338 | sbio->bio->bi_io_vec[ix].bv_page)) { | ||
339 | /* I/O-error, writeback failed, give up */ | ||
340 | goto uncorrectable; | ||
341 | } | ||
342 | } | ||
343 | |||
344 | kfree(multi); | ||
345 | spin_lock(&sdev->stat_lock); | ||
346 | ++sdev->stat.corrected_errors; | ||
347 | spin_unlock(&sdev->stat_lock); | ||
348 | |||
349 | if (printk_ratelimit()) | ||
350 | printk(KERN_ERR "btrfs: fixed up at %llu\n", | ||
351 | (unsigned long long)logical); | ||
352 | return; | ||
353 | |||
354 | uncorrectable: | ||
355 | kfree(multi); | ||
356 | spin_lock(&sdev->stat_lock); | ||
357 | ++sdev->stat.uncorrectable_errors; | ||
358 | spin_unlock(&sdev->stat_lock); | ||
359 | |||
360 | if (printk_ratelimit()) | ||
361 | printk(KERN_ERR "btrfs: unable to fixup at %llu\n", | ||
362 | (unsigned long long)logical); | ||
363 | } | ||
364 | |||
365 | static int scrub_fixup_io(int rw, struct block_device *bdev, sector_t sector, | ||
366 | struct page *page) | ||
367 | { | ||
368 | struct bio *bio = NULL; | ||
369 | int ret; | ||
370 | DECLARE_COMPLETION_ONSTACK(complete); | ||
371 | |||
372 | /* we are going to wait on this IO */ | ||
373 | rw |= REQ_SYNC; | ||
374 | |||
375 | bio = bio_alloc(GFP_NOFS, 1); | ||
376 | bio->bi_bdev = bdev; | ||
377 | bio->bi_sector = sector; | ||
378 | bio_add_page(bio, page, PAGE_SIZE, 0); | ||
379 | bio->bi_end_io = scrub_fixup_end_io; | ||
380 | bio->bi_private = &complete; | ||
381 | submit_bio(rw, bio); | ||
382 | |||
383 | wait_for_completion(&complete); | ||
384 | |||
385 | ret = !test_bit(BIO_UPTODATE, &bio->bi_flags); | ||
386 | bio_put(bio); | ||
387 | return ret; | ||
388 | } | ||
389 | |||
390 | static void scrub_bio_end_io(struct bio *bio, int err) | ||
391 | { | ||
392 | struct scrub_bio *sbio = bio->bi_private; | ||
393 | struct scrub_dev *sdev = sbio->sdev; | ||
394 | struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info; | ||
395 | |||
396 | sbio->err = err; | ||
397 | |||
398 | btrfs_queue_worker(&fs_info->scrub_workers, &sbio->work); | ||
399 | } | ||
400 | |||
401 | static void scrub_checksum(struct btrfs_work *work) | ||
402 | { | ||
403 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | ||
404 | struct scrub_dev *sdev = sbio->sdev; | ||
405 | struct page *page; | ||
406 | void *buffer; | ||
407 | int i; | ||
408 | u64 flags; | ||
409 | u64 logical; | ||
410 | int ret; | ||
411 | |||
412 | if (sbio->err) { | ||
413 | for (i = 0; i < sbio->count; ++i) | ||
414 | scrub_recheck_error(sbio, i); | ||
415 | |||
416 | sbio->bio->bi_flags &= ~(BIO_POOL_MASK - 1); | ||
417 | sbio->bio->bi_flags |= 1 << BIO_UPTODATE; | ||
418 | sbio->bio->bi_phys_segments = 0; | ||
419 | sbio->bio->bi_idx = 0; | ||
420 | |||
421 | for (i = 0; i < sbio->count; i++) { | ||
422 | struct bio_vec *bi; | ||
423 | bi = &sbio->bio->bi_io_vec[i]; | ||
424 | bi->bv_offset = 0; | ||
425 | bi->bv_len = PAGE_SIZE; | ||
426 | } | ||
427 | |||
428 | spin_lock(&sdev->stat_lock); | ||
429 | ++sdev->stat.read_errors; | ||
430 | spin_unlock(&sdev->stat_lock); | ||
431 | goto out; | ||
432 | } | ||
433 | for (i = 0; i < sbio->count; ++i) { | ||
434 | page = sbio->bio->bi_io_vec[i].bv_page; | ||
435 | buffer = kmap_atomic(page, KM_USER0); | ||
436 | flags = sbio->spag[i].flags; | ||
437 | logical = sbio->logical + i * PAGE_SIZE; | ||
438 | ret = 0; | ||
439 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | ||
440 | ret = scrub_checksum_data(sdev, sbio->spag + i, buffer); | ||
441 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | ||
442 | ret = scrub_checksum_tree_block(sdev, sbio->spag + i, | ||
443 | logical, buffer); | ||
444 | } else if (flags & BTRFS_EXTENT_FLAG_SUPER) { | ||
445 | BUG_ON(i); | ||
446 | (void)scrub_checksum_super(sbio, buffer); | ||
447 | } else { | ||
448 | WARN_ON(1); | ||
449 | } | ||
450 | kunmap_atomic(buffer, KM_USER0); | ||
451 | if (ret) | ||
452 | scrub_recheck_error(sbio, i); | ||
453 | } | ||
454 | |||
455 | out: | ||
456 | spin_lock(&sdev->list_lock); | ||
457 | sbio->next_free = sdev->first_free; | ||
458 | sdev->first_free = sbio->index; | ||
459 | spin_unlock(&sdev->list_lock); | ||
460 | atomic_dec(&sdev->in_flight); | ||
461 | wake_up(&sdev->list_wait); | ||
462 | } | ||
463 | |||
464 | static int scrub_checksum_data(struct scrub_dev *sdev, | ||
465 | struct scrub_page *spag, void *buffer) | ||
466 | { | ||
467 | u8 csum[BTRFS_CSUM_SIZE]; | ||
468 | u32 crc = ~(u32)0; | ||
469 | int fail = 0; | ||
470 | struct btrfs_root *root = sdev->dev->dev_root; | ||
471 | |||
472 | if (!spag->have_csum) | ||
473 | return 0; | ||
474 | |||
475 | crc = btrfs_csum_data(root, buffer, crc, PAGE_SIZE); | ||
476 | btrfs_csum_final(crc, csum); | ||
477 | if (memcmp(csum, spag->csum, sdev->csum_size)) | ||
478 | fail = 1; | ||
479 | |||
480 | spin_lock(&sdev->stat_lock); | ||
481 | ++sdev->stat.data_extents_scrubbed; | ||
482 | sdev->stat.data_bytes_scrubbed += PAGE_SIZE; | ||
483 | if (fail) | ||
484 | ++sdev->stat.csum_errors; | ||
485 | spin_unlock(&sdev->stat_lock); | ||
486 | |||
487 | return fail; | ||
488 | } | ||
489 | |||
490 | static int scrub_checksum_tree_block(struct scrub_dev *sdev, | ||
491 | struct scrub_page *spag, u64 logical, | ||
492 | void *buffer) | ||
493 | { | ||
494 | struct btrfs_header *h; | ||
495 | struct btrfs_root *root = sdev->dev->dev_root; | ||
496 | struct btrfs_fs_info *fs_info = root->fs_info; | ||
497 | u8 csum[BTRFS_CSUM_SIZE]; | ||
498 | u32 crc = ~(u32)0; | ||
499 | int fail = 0; | ||
500 | int crc_fail = 0; | ||
501 | |||
502 | /* | ||
503 | * we don't use the getter functions here, as we | ||
504 | * a) don't have an extent buffer and | ||
505 | * b) the page is already kmapped | ||
506 | */ | ||
507 | h = (struct btrfs_header *)buffer; | ||
508 | |||
509 | if (logical != le64_to_cpu(h->bytenr)) | ||
510 | ++fail; | ||
511 | |||
512 | if (spag->generation != le64_to_cpu(h->generation)) | ||
513 | ++fail; | ||
514 | |||
515 | if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) | ||
516 | ++fail; | ||
517 | |||
518 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | ||
519 | BTRFS_UUID_SIZE)) | ||
520 | ++fail; | ||
521 | |||
522 | crc = btrfs_csum_data(root, buffer + BTRFS_CSUM_SIZE, crc, | ||
523 | PAGE_SIZE - BTRFS_CSUM_SIZE); | ||
524 | btrfs_csum_final(crc, csum); | ||
525 | if (memcmp(csum, h->csum, sdev->csum_size)) | ||
526 | ++crc_fail; | ||
527 | |||
528 | spin_lock(&sdev->stat_lock); | ||
529 | ++sdev->stat.tree_extents_scrubbed; | ||
530 | sdev->stat.tree_bytes_scrubbed += PAGE_SIZE; | ||
531 | if (crc_fail) | ||
532 | ++sdev->stat.csum_errors; | ||
533 | if (fail) | ||
534 | ++sdev->stat.verify_errors; | ||
535 | spin_unlock(&sdev->stat_lock); | ||
536 | |||
537 | return fail || crc_fail; | ||
538 | } | ||
539 | |||
540 | static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer) | ||
541 | { | ||
542 | struct btrfs_super_block *s; | ||
543 | u64 logical; | ||
544 | struct scrub_dev *sdev = sbio->sdev; | ||
545 | struct btrfs_root *root = sdev->dev->dev_root; | ||
546 | struct btrfs_fs_info *fs_info = root->fs_info; | ||
547 | u8 csum[BTRFS_CSUM_SIZE]; | ||
548 | u32 crc = ~(u32)0; | ||
549 | int fail = 0; | ||
550 | |||
551 | s = (struct btrfs_super_block *)buffer; | ||
552 | logical = sbio->logical; | ||
553 | |||
554 | if (logical != le64_to_cpu(s->bytenr)) | ||
555 | ++fail; | ||
556 | |||
557 | if (sbio->spag[0].generation != le64_to_cpu(s->generation)) | ||
558 | ++fail; | ||
559 | |||
560 | if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) | ||
561 | ++fail; | ||
562 | |||
563 | crc = btrfs_csum_data(root, buffer + BTRFS_CSUM_SIZE, crc, | ||
564 | PAGE_SIZE - BTRFS_CSUM_SIZE); | ||
565 | btrfs_csum_final(crc, csum); | ||
566 | if (memcmp(csum, s->csum, sbio->sdev->csum_size)) | ||
567 | ++fail; | ||
568 | |||
569 | if (fail) { | ||
570 | /* | ||
571 | * if we find an error in a super block, we just report it. | ||
572 | * They will get written with the next transaction commit | ||
573 | * anyway | ||
574 | */ | ||
575 | spin_lock(&sdev->stat_lock); | ||
576 | ++sdev->stat.super_errors; | ||
577 | spin_unlock(&sdev->stat_lock); | ||
578 | } | ||
579 | |||
580 | return fail; | ||
581 | } | ||
582 | |||
583 | static int scrub_submit(struct scrub_dev *sdev) | ||
584 | { | ||
585 | struct scrub_bio *sbio; | ||
586 | |||
587 | if (sdev->curr == -1) | ||
588 | return 0; | ||
589 | |||
590 | sbio = sdev->bios[sdev->curr]; | ||
591 | |||
592 | sbio->bio->bi_sector = sbio->physical >> 9; | ||
593 | sbio->bio->bi_size = sbio->count * PAGE_SIZE; | ||
594 | sbio->bio->bi_next = NULL; | ||
595 | sbio->bio->bi_flags |= 1 << BIO_UPTODATE; | ||
596 | sbio->bio->bi_comp_cpu = -1; | ||
597 | sbio->bio->bi_bdev = sdev->dev->bdev; | ||
598 | sbio->err = 0; | ||
599 | sdev->curr = -1; | ||
600 | atomic_inc(&sdev->in_flight); | ||
601 | |||
602 | submit_bio(0, sbio->bio); | ||
603 | |||
604 | return 0; | ||
605 | } | ||
606 | |||
607 | static int scrub_page(struct scrub_dev *sdev, u64 logical, u64 len, | ||
608 | u64 physical, u64 flags, u64 gen, u64 mirror_num, | ||
609 | u8 *csum, int force) | ||
610 | { | ||
611 | struct scrub_bio *sbio; | ||
612 | |||
613 | again: | ||
614 | /* | ||
615 | * grab a fresh bio or wait for one to become available | ||
616 | */ | ||
617 | while (sdev->curr == -1) { | ||
618 | spin_lock(&sdev->list_lock); | ||
619 | sdev->curr = sdev->first_free; | ||
620 | if (sdev->curr != -1) { | ||
621 | sdev->first_free = sdev->bios[sdev->curr]->next_free; | ||
622 | sdev->bios[sdev->curr]->next_free = -1; | ||
623 | sdev->bios[sdev->curr]->count = 0; | ||
624 | spin_unlock(&sdev->list_lock); | ||
625 | } else { | ||
626 | spin_unlock(&sdev->list_lock); | ||
627 | wait_event(sdev->list_wait, sdev->first_free != -1); | ||
628 | } | ||
629 | } | ||
630 | sbio = sdev->bios[sdev->curr]; | ||
631 | if (sbio->count == 0) { | ||
632 | sbio->physical = physical; | ||
633 | sbio->logical = logical; | ||
634 | } else if (sbio->physical + sbio->count * PAGE_SIZE != physical) { | ||
635 | scrub_submit(sdev); | ||
636 | goto again; | ||
637 | } | ||
638 | sbio->spag[sbio->count].flags = flags; | ||
639 | sbio->spag[sbio->count].generation = gen; | ||
640 | sbio->spag[sbio->count].have_csum = 0; | ||
641 | sbio->spag[sbio->count].mirror_num = mirror_num; | ||
642 | if (csum) { | ||
643 | sbio->spag[sbio->count].have_csum = 1; | ||
644 | memcpy(sbio->spag[sbio->count].csum, csum, sdev->csum_size); | ||
645 | } | ||
646 | ++sbio->count; | ||
647 | if (sbio->count == SCRUB_PAGES_PER_BIO || force) | ||
648 | scrub_submit(sdev); | ||
649 | |||
650 | return 0; | ||
651 | } | ||
652 | |||
653 | static int scrub_find_csum(struct scrub_dev *sdev, u64 logical, u64 len, | ||
654 | u8 *csum) | ||
655 | { | ||
656 | struct btrfs_ordered_sum *sum = NULL; | ||
657 | int ret = 0; | ||
658 | unsigned long i; | ||
659 | unsigned long num_sectors; | ||
660 | u32 sectorsize = sdev->dev->dev_root->sectorsize; | ||
661 | |||
662 | while (!list_empty(&sdev->csum_list)) { | ||
663 | sum = list_first_entry(&sdev->csum_list, | ||
664 | struct btrfs_ordered_sum, list); | ||
665 | if (sum->bytenr > logical) | ||
666 | return 0; | ||
667 | if (sum->bytenr + sum->len > logical) | ||
668 | break; | ||
669 | |||
670 | ++sdev->stat.csum_discards; | ||
671 | list_del(&sum->list); | ||
672 | kfree(sum); | ||
673 | sum = NULL; | ||
674 | } | ||
675 | if (!sum) | ||
676 | return 0; | ||
677 | |||
678 | num_sectors = sum->len / sectorsize; | ||
679 | for (i = 0; i < num_sectors; ++i) { | ||
680 | if (sum->sums[i].bytenr == logical) { | ||
681 | memcpy(csum, &sum->sums[i].sum, sdev->csum_size); | ||
682 | ret = 1; | ||
683 | break; | ||
684 | } | ||
685 | } | ||
686 | if (ret && i == num_sectors - 1) { | ||
687 | list_del(&sum->list); | ||
688 | kfree(sum); | ||
689 | } | ||
690 | return ret; | ||
691 | } | ||
692 | |||
693 | /* scrub extent tries to collect up to 64 kB for each bio */ | ||
694 | static int scrub_extent(struct scrub_dev *sdev, u64 logical, u64 len, | ||
695 | u64 physical, u64 flags, u64 gen, u64 mirror_num) | ||
696 | { | ||
697 | int ret; | ||
698 | u8 csum[BTRFS_CSUM_SIZE]; | ||
699 | |||
700 | while (len) { | ||
701 | u64 l = min_t(u64, len, PAGE_SIZE); | ||
702 | int have_csum = 0; | ||
703 | |||
704 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | ||
705 | /* push csums to sbio */ | ||
706 | have_csum = scrub_find_csum(sdev, logical, l, csum); | ||
707 | if (have_csum == 0) | ||
708 | ++sdev->stat.no_csum; | ||
709 | } | ||
710 | ret = scrub_page(sdev, logical, l, physical, flags, gen, | ||
711 | mirror_num, have_csum ? csum : NULL, 0); | ||
712 | if (ret) | ||
713 | return ret; | ||
714 | len -= l; | ||
715 | logical += l; | ||
716 | physical += l; | ||
717 | } | ||
718 | return 0; | ||
719 | } | ||
720 | |||
721 | static noinline_for_stack int scrub_stripe(struct scrub_dev *sdev, | ||
722 | struct map_lookup *map, int num, u64 base, u64 length) | ||
723 | { | ||
724 | struct btrfs_path *path; | ||
725 | struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info; | ||
726 | struct btrfs_root *root = fs_info->extent_root; | ||
727 | struct btrfs_root *csum_root = fs_info->csum_root; | ||
728 | struct btrfs_extent_item *extent; | ||
729 | u64 flags; | ||
730 | int ret; | ||
731 | int slot; | ||
732 | int i; | ||
733 | u64 nstripes; | ||
734 | int start_stripe; | ||
735 | struct extent_buffer *l; | ||
736 | struct btrfs_key key; | ||
737 | u64 physical; | ||
738 | u64 logical; | ||
739 | u64 generation; | ||
740 | u64 mirror_num; | ||
741 | |||
742 | u64 increment = map->stripe_len; | ||
743 | u64 offset; | ||
744 | |||
745 | nstripes = length; | ||
746 | offset = 0; | ||
747 | do_div(nstripes, map->stripe_len); | ||
748 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | ||
749 | offset = map->stripe_len * num; | ||
750 | increment = map->stripe_len * map->num_stripes; | ||
751 | mirror_num = 0; | ||
752 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | ||
753 | int factor = map->num_stripes / map->sub_stripes; | ||
754 | offset = map->stripe_len * (num / map->sub_stripes); | ||
755 | increment = map->stripe_len * factor; | ||
756 | mirror_num = num % map->sub_stripes; | ||
757 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { | ||
758 | increment = map->stripe_len; | ||
759 | mirror_num = num % map->num_stripes; | ||
760 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { | ||
761 | increment = map->stripe_len; | ||
762 | mirror_num = num % map->num_stripes; | ||
763 | } else { | ||
764 | increment = map->stripe_len; | ||
765 | mirror_num = 0; | ||
766 | } | ||
767 | |||
768 | path = btrfs_alloc_path(); | ||
769 | if (!path) | ||
770 | return -ENOMEM; | ||
771 | |||
772 | path->reada = 2; | ||
773 | path->search_commit_root = 1; | ||
774 | path->skip_locking = 1; | ||
775 | |||
776 | /* | ||
777 | * find all extents for each stripe and just read them to get | ||
778 | * them into the page cache | ||
779 | * FIXME: we can do better. build a more intelligent prefetching | ||
780 | */ | ||
781 | logical = base + offset; | ||
782 | physical = map->stripes[num].physical; | ||
783 | ret = 0; | ||
784 | for (i = 0; i < nstripes; ++i) { | ||
785 | key.objectid = logical; | ||
786 | key.type = BTRFS_EXTENT_ITEM_KEY; | ||
787 | key.offset = (u64)0; | ||
788 | |||
789 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | ||
790 | if (ret < 0) | ||
791 | goto out; | ||
792 | |||
793 | l = path->nodes[0]; | ||
794 | slot = path->slots[0]; | ||
795 | btrfs_item_key_to_cpu(l, &key, slot); | ||
796 | if (key.objectid != logical) { | ||
797 | ret = btrfs_previous_item(root, path, 0, | ||
798 | BTRFS_EXTENT_ITEM_KEY); | ||
799 | if (ret < 0) | ||
800 | goto out; | ||
801 | } | ||
802 | |||
803 | while (1) { | ||
804 | l = path->nodes[0]; | ||
805 | slot = path->slots[0]; | ||
806 | if (slot >= btrfs_header_nritems(l)) { | ||
807 | ret = btrfs_next_leaf(root, path); | ||
808 | if (ret == 0) | ||
809 | continue; | ||
810 | if (ret < 0) | ||
811 | goto out; | ||
812 | |||
813 | break; | ||
814 | } | ||
815 | btrfs_item_key_to_cpu(l, &key, slot); | ||
816 | |||
817 | if (key.objectid >= logical + map->stripe_len) | ||
818 | break; | ||
819 | |||
820 | path->slots[0]++; | ||
821 | } | ||
822 | btrfs_release_path(path); | ||
823 | logical += increment; | ||
824 | physical += map->stripe_len; | ||
825 | cond_resched(); | ||
826 | } | ||
827 | |||
828 | /* | ||
829 | * collect all data csums for the stripe to avoid seeking during | ||
830 | * the scrub. This might currently (crc32) end up to be about 1MB | ||
831 | */ | ||
832 | start_stripe = 0; | ||
833 | again: | ||
834 | logical = base + offset + start_stripe * increment; | ||
835 | for (i = start_stripe; i < nstripes; ++i) { | ||
836 | ret = btrfs_lookup_csums_range(csum_root, logical, | ||
837 | logical + map->stripe_len - 1, | ||
838 | &sdev->csum_list, 1); | ||
839 | if (ret) | ||
840 | goto out; | ||
841 | |||
842 | logical += increment; | ||
843 | cond_resched(); | ||
844 | } | ||
845 | /* | ||
846 | * now find all extents for each stripe and scrub them | ||
847 | */ | ||
848 | logical = base + offset + start_stripe * increment; | ||
849 | physical = map->stripes[num].physical + start_stripe * map->stripe_len; | ||
850 | ret = 0; | ||
851 | for (i = start_stripe; i < nstripes; ++i) { | ||
852 | /* | ||
853 | * canceled? | ||
854 | */ | ||
855 | if (atomic_read(&fs_info->scrub_cancel_req) || | ||
856 | atomic_read(&sdev->cancel_req)) { | ||
857 | ret = -ECANCELED; | ||
858 | goto out; | ||
859 | } | ||
860 | /* | ||
861 | * check to see if we have to pause | ||
862 | */ | ||
863 | if (atomic_read(&fs_info->scrub_pause_req)) { | ||
864 | /* push queued extents */ | ||
865 | scrub_submit(sdev); | ||
866 | wait_event(sdev->list_wait, | ||
867 | atomic_read(&sdev->in_flight) == 0); | ||
868 | atomic_inc(&fs_info->scrubs_paused); | ||
869 | wake_up(&fs_info->scrub_pause_wait); | ||
870 | mutex_lock(&fs_info->scrub_lock); | ||
871 | while (atomic_read(&fs_info->scrub_pause_req)) { | ||
872 | mutex_unlock(&fs_info->scrub_lock); | ||
873 | wait_event(fs_info->scrub_pause_wait, | ||
874 | atomic_read(&fs_info->scrub_pause_req) == 0); | ||
875 | mutex_lock(&fs_info->scrub_lock); | ||
876 | } | ||
877 | atomic_dec(&fs_info->scrubs_paused); | ||
878 | mutex_unlock(&fs_info->scrub_lock); | ||
879 | wake_up(&fs_info->scrub_pause_wait); | ||
880 | scrub_free_csums(sdev); | ||
881 | start_stripe = i; | ||
882 | goto again; | ||
883 | } | ||
884 | |||
885 | key.objectid = logical; | ||
886 | key.type = BTRFS_EXTENT_ITEM_KEY; | ||
887 | key.offset = (u64)0; | ||
888 | |||
889 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | ||
890 | if (ret < 0) | ||
891 | goto out; | ||
892 | |||
893 | l = path->nodes[0]; | ||
894 | slot = path->slots[0]; | ||
895 | btrfs_item_key_to_cpu(l, &key, slot); | ||
896 | if (key.objectid != logical) { | ||
897 | ret = btrfs_previous_item(root, path, 0, | ||
898 | BTRFS_EXTENT_ITEM_KEY); | ||
899 | if (ret < 0) | ||
900 | goto out; | ||
901 | } | ||
902 | |||
903 | while (1) { | ||
904 | l = path->nodes[0]; | ||
905 | slot = path->slots[0]; | ||
906 | if (slot >= btrfs_header_nritems(l)) { | ||
907 | ret = btrfs_next_leaf(root, path); | ||
908 | if (ret == 0) | ||
909 | continue; | ||
910 | if (ret < 0) | ||
911 | goto out; | ||
912 | |||
913 | break; | ||
914 | } | ||
915 | btrfs_item_key_to_cpu(l, &key, slot); | ||
916 | |||
917 | if (key.objectid + key.offset <= logical) | ||
918 | goto next; | ||
919 | |||
920 | if (key.objectid >= logical + map->stripe_len) | ||
921 | break; | ||
922 | |||
923 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) | ||
924 | goto next; | ||
925 | |||
926 | extent = btrfs_item_ptr(l, slot, | ||
927 | struct btrfs_extent_item); | ||
928 | flags = btrfs_extent_flags(l, extent); | ||
929 | generation = btrfs_extent_generation(l, extent); | ||
930 | |||
931 | if (key.objectid < logical && | ||
932 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { | ||
933 | printk(KERN_ERR | ||
934 | "btrfs scrub: tree block %llu spanning " | ||
935 | "stripes, ignored. logical=%llu\n", | ||
936 | (unsigned long long)key.objectid, | ||
937 | (unsigned long long)logical); | ||
938 | goto next; | ||
939 | } | ||
940 | |||
941 | /* | ||
942 | * trim extent to this stripe | ||
943 | */ | ||
944 | if (key.objectid < logical) { | ||
945 | key.offset -= logical - key.objectid; | ||
946 | key.objectid = logical; | ||
947 | } | ||
948 | if (key.objectid + key.offset > | ||
949 | logical + map->stripe_len) { | ||
950 | key.offset = logical + map->stripe_len - | ||
951 | key.objectid; | ||
952 | } | ||
953 | |||
954 | ret = scrub_extent(sdev, key.objectid, key.offset, | ||
955 | key.objectid - logical + physical, | ||
956 | flags, generation, mirror_num); | ||
957 | if (ret) | ||
958 | goto out; | ||
959 | |||
960 | next: | ||
961 | path->slots[0]++; | ||
962 | } | ||
963 | btrfs_release_path(path); | ||
964 | logical += increment; | ||
965 | physical += map->stripe_len; | ||
966 | spin_lock(&sdev->stat_lock); | ||
967 | sdev->stat.last_physical = physical; | ||
968 | spin_unlock(&sdev->stat_lock); | ||
969 | } | ||
970 | /* push queued extents */ | ||
971 | scrub_submit(sdev); | ||
972 | |||
973 | out: | ||
974 | btrfs_free_path(path); | ||
975 | return ret < 0 ? ret : 0; | ||
976 | } | ||
977 | |||
978 | static noinline_for_stack int scrub_chunk(struct scrub_dev *sdev, | ||
979 | u64 chunk_tree, u64 chunk_objectid, u64 chunk_offset, u64 length) | ||
980 | { | ||
981 | struct btrfs_mapping_tree *map_tree = | ||
982 | &sdev->dev->dev_root->fs_info->mapping_tree; | ||
983 | struct map_lookup *map; | ||
984 | struct extent_map *em; | ||
985 | int i; | ||
986 | int ret = -EINVAL; | ||
987 | |||
988 | read_lock(&map_tree->map_tree.lock); | ||
989 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | ||
990 | read_unlock(&map_tree->map_tree.lock); | ||
991 | |||
992 | if (!em) | ||
993 | return -EINVAL; | ||
994 | |||
995 | map = (struct map_lookup *)em->bdev; | ||
996 | if (em->start != chunk_offset) | ||
997 | goto out; | ||
998 | |||
999 | if (em->len < length) | ||
1000 | goto out; | ||
1001 | |||
1002 | for (i = 0; i < map->num_stripes; ++i) { | ||
1003 | if (map->stripes[i].dev == sdev->dev) { | ||
1004 | ret = scrub_stripe(sdev, map, i, chunk_offset, length); | ||
1005 | if (ret) | ||
1006 | goto out; | ||
1007 | } | ||
1008 | } | ||
1009 | out: | ||
1010 | free_extent_map(em); | ||
1011 | |||
1012 | return ret; | ||
1013 | } | ||
1014 | |||
1015 | static noinline_for_stack | ||
1016 | int scrub_enumerate_chunks(struct scrub_dev *sdev, u64 start, u64 end) | ||
1017 | { | ||
1018 | struct btrfs_dev_extent *dev_extent = NULL; | ||
1019 | struct btrfs_path *path; | ||
1020 | struct btrfs_root *root = sdev->dev->dev_root; | ||
1021 | struct btrfs_fs_info *fs_info = root->fs_info; | ||
1022 | u64 length; | ||
1023 | u64 chunk_tree; | ||
1024 | u64 chunk_objectid; | ||
1025 | u64 chunk_offset; | ||
1026 | int ret; | ||
1027 | int slot; | ||
1028 | struct extent_buffer *l; | ||
1029 | struct btrfs_key key; | ||
1030 | struct btrfs_key found_key; | ||
1031 | struct btrfs_block_group_cache *cache; | ||
1032 | |||
1033 | path = btrfs_alloc_path(); | ||
1034 | if (!path) | ||
1035 | return -ENOMEM; | ||
1036 | |||
1037 | path->reada = 2; | ||
1038 | path->search_commit_root = 1; | ||
1039 | path->skip_locking = 1; | ||
1040 | |||
1041 | key.objectid = sdev->dev->devid; | ||
1042 | key.offset = 0ull; | ||
1043 | key.type = BTRFS_DEV_EXTENT_KEY; | ||
1044 | |||
1045 | |||
1046 | while (1) { | ||
1047 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | ||
1048 | if (ret < 0) | ||
1049 | goto out; | ||
1050 | ret = 0; | ||
1051 | |||
1052 | l = path->nodes[0]; | ||
1053 | slot = path->slots[0]; | ||
1054 | |||
1055 | btrfs_item_key_to_cpu(l, &found_key, slot); | ||
1056 | |||
1057 | if (found_key.objectid != sdev->dev->devid) | ||
1058 | break; | ||
1059 | |||
1060 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) | ||
1061 | break; | ||
1062 | |||
1063 | if (found_key.offset >= end) | ||
1064 | break; | ||
1065 | |||
1066 | if (found_key.offset < key.offset) | ||
1067 | break; | ||
1068 | |||
1069 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | ||
1070 | length = btrfs_dev_extent_length(l, dev_extent); | ||
1071 | |||
1072 | if (found_key.offset + length <= start) { | ||
1073 | key.offset = found_key.offset + length; | ||
1074 | btrfs_release_path(path); | ||
1075 | continue; | ||
1076 | } | ||
1077 | |||
1078 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | ||
1079 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | ||
1080 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | ||
1081 | |||
1082 | /* | ||
1083 | * get a reference on the corresponding block group to prevent | ||
1084 | * the chunk from going away while we scrub it | ||
1085 | */ | ||
1086 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | ||
1087 | if (!cache) { | ||
1088 | ret = -ENOENT; | ||
1089 | goto out; | ||
1090 | } | ||
1091 | ret = scrub_chunk(sdev, chunk_tree, chunk_objectid, | ||
1092 | chunk_offset, length); | ||
1093 | btrfs_put_block_group(cache); | ||
1094 | if (ret) | ||
1095 | break; | ||
1096 | |||
1097 | key.offset = found_key.offset + length; | ||
1098 | btrfs_release_path(path); | ||
1099 | } | ||
1100 | |||
1101 | out: | ||
1102 | btrfs_free_path(path); | ||
1103 | return ret; | ||
1104 | } | ||
1105 | |||
1106 | static noinline_for_stack int scrub_supers(struct scrub_dev *sdev) | ||
1107 | { | ||
1108 | int i; | ||
1109 | u64 bytenr; | ||
1110 | u64 gen; | ||
1111 | int ret; | ||
1112 | struct btrfs_device *device = sdev->dev; | ||
1113 | struct btrfs_root *root = device->dev_root; | ||
1114 | |||
1115 | gen = root->fs_info->last_trans_committed; | ||
1116 | |||
1117 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | ||
1118 | bytenr = btrfs_sb_offset(i); | ||
1119 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) | ||
1120 | break; | ||
1121 | |||
1122 | ret = scrub_page(sdev, bytenr, PAGE_SIZE, bytenr, | ||
1123 | BTRFS_EXTENT_FLAG_SUPER, gen, i, NULL, 1); | ||
1124 | if (ret) | ||
1125 | return ret; | ||
1126 | } | ||
1127 | wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0); | ||
1128 | |||
1129 | return 0; | ||
1130 | } | ||
1131 | |||
1132 | /* | ||
1133 | * get a reference count on fs_info->scrub_workers. start worker if necessary | ||
1134 | */ | ||
1135 | static noinline_for_stack int scrub_workers_get(struct btrfs_root *root) | ||
1136 | { | ||
1137 | struct btrfs_fs_info *fs_info = root->fs_info; | ||
1138 | |||
1139 | mutex_lock(&fs_info->scrub_lock); | ||
1140 | if (fs_info->scrub_workers_refcnt == 0) | ||
1141 | btrfs_start_workers(&fs_info->scrub_workers, 1); | ||
1142 | ++fs_info->scrub_workers_refcnt; | ||
1143 | mutex_unlock(&fs_info->scrub_lock); | ||
1144 | |||
1145 | return 0; | ||
1146 | } | ||
1147 | |||
1148 | static noinline_for_stack void scrub_workers_put(struct btrfs_root *root) | ||
1149 | { | ||
1150 | struct btrfs_fs_info *fs_info = root->fs_info; | ||
1151 | |||
1152 | mutex_lock(&fs_info->scrub_lock); | ||
1153 | if (--fs_info->scrub_workers_refcnt == 0) | ||
1154 | btrfs_stop_workers(&fs_info->scrub_workers); | ||
1155 | WARN_ON(fs_info->scrub_workers_refcnt < 0); | ||
1156 | mutex_unlock(&fs_info->scrub_lock); | ||
1157 | } | ||
1158 | |||
1159 | |||
1160 | int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end, | ||
1161 | struct btrfs_scrub_progress *progress, int readonly) | ||
1162 | { | ||
1163 | struct scrub_dev *sdev; | ||
1164 | struct btrfs_fs_info *fs_info = root->fs_info; | ||
1165 | int ret; | ||
1166 | struct btrfs_device *dev; | ||
1167 | |||
1168 | if (root->fs_info->closing) | ||
1169 | return -EINVAL; | ||
1170 | |||
1171 | /* | ||
1172 | * check some assumptions | ||
1173 | */ | ||
1174 | if (root->sectorsize != PAGE_SIZE || | ||
1175 | root->sectorsize != root->leafsize || | ||
1176 | root->sectorsize != root->nodesize) { | ||
1177 | printk(KERN_ERR "btrfs_scrub: size assumptions fail\n"); | ||
1178 | return -EINVAL; | ||
1179 | } | ||
1180 | |||
1181 | ret = scrub_workers_get(root); | ||
1182 | if (ret) | ||
1183 | return ret; | ||
1184 | |||
1185 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | ||
1186 | dev = btrfs_find_device(root, devid, NULL, NULL); | ||
1187 | if (!dev || dev->missing) { | ||
1188 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | ||
1189 | scrub_workers_put(root); | ||
1190 | return -ENODEV; | ||
1191 | } | ||
1192 | mutex_lock(&fs_info->scrub_lock); | ||
1193 | |||
1194 | if (!dev->in_fs_metadata) { | ||
1195 | mutex_unlock(&fs_info->scrub_lock); | ||
1196 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | ||
1197 | scrub_workers_put(root); | ||
1198 | return -ENODEV; | ||
1199 | } | ||
1200 | |||
1201 | if (dev->scrub_device) { | ||
1202 | mutex_unlock(&fs_info->scrub_lock); | ||
1203 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | ||
1204 | scrub_workers_put(root); | ||
1205 | return -EINPROGRESS; | ||
1206 | } | ||
1207 | sdev = scrub_setup_dev(dev); | ||
1208 | if (IS_ERR(sdev)) { | ||
1209 | mutex_unlock(&fs_info->scrub_lock); | ||
1210 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | ||
1211 | scrub_workers_put(root); | ||
1212 | return PTR_ERR(sdev); | ||
1213 | } | ||
1214 | sdev->readonly = readonly; | ||
1215 | dev->scrub_device = sdev; | ||
1216 | |||
1217 | atomic_inc(&fs_info->scrubs_running); | ||
1218 | mutex_unlock(&fs_info->scrub_lock); | ||
1219 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | ||
1220 | |||
1221 | down_read(&fs_info->scrub_super_lock); | ||
1222 | ret = scrub_supers(sdev); | ||
1223 | up_read(&fs_info->scrub_super_lock); | ||
1224 | |||
1225 | if (!ret) | ||
1226 | ret = scrub_enumerate_chunks(sdev, start, end); | ||
1227 | |||
1228 | wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0); | ||
1229 | |||
1230 | atomic_dec(&fs_info->scrubs_running); | ||
1231 | wake_up(&fs_info->scrub_pause_wait); | ||
1232 | |||
1233 | if (progress) | ||
1234 | memcpy(progress, &sdev->stat, sizeof(*progress)); | ||
1235 | |||
1236 | mutex_lock(&fs_info->scrub_lock); | ||
1237 | dev->scrub_device = NULL; | ||
1238 | mutex_unlock(&fs_info->scrub_lock); | ||
1239 | |||
1240 | scrub_free_dev(sdev); | ||
1241 | scrub_workers_put(root); | ||
1242 | |||
1243 | return ret; | ||
1244 | } | ||
1245 | |||
1246 | int btrfs_scrub_pause(struct btrfs_root *root) | ||
1247 | { | ||
1248 | struct btrfs_fs_info *fs_info = root->fs_info; | ||
1249 | |||
1250 | mutex_lock(&fs_info->scrub_lock); | ||
1251 | atomic_inc(&fs_info->scrub_pause_req); | ||
1252 | while (atomic_read(&fs_info->scrubs_paused) != | ||
1253 | atomic_read(&fs_info->scrubs_running)) { | ||
1254 | mutex_unlock(&fs_info->scrub_lock); | ||
1255 | wait_event(fs_info->scrub_pause_wait, | ||
1256 | atomic_read(&fs_info->scrubs_paused) == | ||
1257 | atomic_read(&fs_info->scrubs_running)); | ||
1258 | mutex_lock(&fs_info->scrub_lock); | ||
1259 | } | ||
1260 | mutex_unlock(&fs_info->scrub_lock); | ||
1261 | |||
1262 | return 0; | ||
1263 | } | ||
1264 | |||
1265 | int btrfs_scrub_continue(struct btrfs_root *root) | ||
1266 | { | ||
1267 | struct btrfs_fs_info *fs_info = root->fs_info; | ||
1268 | |||
1269 | atomic_dec(&fs_info->scrub_pause_req); | ||
1270 | wake_up(&fs_info->scrub_pause_wait); | ||
1271 | return 0; | ||
1272 | } | ||
1273 | |||
1274 | int btrfs_scrub_pause_super(struct btrfs_root *root) | ||
1275 | { | ||
1276 | down_write(&root->fs_info->scrub_super_lock); | ||
1277 | return 0; | ||
1278 | } | ||
1279 | |||
1280 | int btrfs_scrub_continue_super(struct btrfs_root *root) | ||
1281 | { | ||
1282 | up_write(&root->fs_info->scrub_super_lock); | ||
1283 | return 0; | ||
1284 | } | ||
1285 | |||
1286 | int btrfs_scrub_cancel(struct btrfs_root *root) | ||
1287 | { | ||
1288 | struct btrfs_fs_info *fs_info = root->fs_info; | ||
1289 | |||
1290 | mutex_lock(&fs_info->scrub_lock); | ||
1291 | if (!atomic_read(&fs_info->scrubs_running)) { | ||
1292 | mutex_unlock(&fs_info->scrub_lock); | ||
1293 | return -ENOTCONN; | ||
1294 | } | ||
1295 | |||
1296 | atomic_inc(&fs_info->scrub_cancel_req); | ||
1297 | while (atomic_read(&fs_info->scrubs_running)) { | ||
1298 | mutex_unlock(&fs_info->scrub_lock); | ||
1299 | wait_event(fs_info->scrub_pause_wait, | ||
1300 | atomic_read(&fs_info->scrubs_running) == 0); | ||
1301 | mutex_lock(&fs_info->scrub_lock); | ||
1302 | } | ||
1303 | atomic_dec(&fs_info->scrub_cancel_req); | ||
1304 | mutex_unlock(&fs_info->scrub_lock); | ||
1305 | |||
1306 | return 0; | ||
1307 | } | ||
1308 | |||
1309 | int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev) | ||
1310 | { | ||
1311 | struct btrfs_fs_info *fs_info = root->fs_info; | ||
1312 | struct scrub_dev *sdev; | ||
1313 | |||
1314 | mutex_lock(&fs_info->scrub_lock); | ||
1315 | sdev = dev->scrub_device; | ||
1316 | if (!sdev) { | ||
1317 | mutex_unlock(&fs_info->scrub_lock); | ||
1318 | return -ENOTCONN; | ||
1319 | } | ||
1320 | atomic_inc(&sdev->cancel_req); | ||
1321 | while (dev->scrub_device) { | ||
1322 | mutex_unlock(&fs_info->scrub_lock); | ||
1323 | wait_event(fs_info->scrub_pause_wait, | ||
1324 | dev->scrub_device == NULL); | ||
1325 | mutex_lock(&fs_info->scrub_lock); | ||
1326 | } | ||
1327 | mutex_unlock(&fs_info->scrub_lock); | ||
1328 | |||
1329 | return 0; | ||
1330 | } | ||
1331 | int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid) | ||
1332 | { | ||
1333 | struct btrfs_fs_info *fs_info = root->fs_info; | ||
1334 | struct btrfs_device *dev; | ||
1335 | int ret; | ||
1336 | |||
1337 | /* | ||
1338 | * we have to hold the device_list_mutex here so the device | ||
1339 | * does not go away in cancel_dev. FIXME: find a better solution | ||
1340 | */ | ||
1341 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | ||
1342 | dev = btrfs_find_device(root, devid, NULL, NULL); | ||
1343 | if (!dev) { | ||
1344 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | ||
1345 | return -ENODEV; | ||
1346 | } | ||
1347 | ret = btrfs_scrub_cancel_dev(root, dev); | ||
1348 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | ||
1349 | |||
1350 | return ret; | ||
1351 | } | ||
1352 | |||
1353 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, | ||
1354 | struct btrfs_scrub_progress *progress) | ||
1355 | { | ||
1356 | struct btrfs_device *dev; | ||
1357 | struct scrub_dev *sdev = NULL; | ||
1358 | |||
1359 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | ||
1360 | dev = btrfs_find_device(root, devid, NULL, NULL); | ||
1361 | if (dev) | ||
1362 | sdev = dev->scrub_device; | ||
1363 | if (sdev) | ||
1364 | memcpy(progress, &sdev->stat, sizeof(*progress)); | ||
1365 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | ||
1366 | |||
1367 | return dev ? (sdev ? 0 : -ENOTCONN) : -ENODEV; | ||
1368 | } | ||