Commit | Line | Data |
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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 | ||
a2de733c | 19 | #include <linux/blkdev.h> |
558540c1 | 20 | #include <linux/ratelimit.h> |
a2de733c AJ |
21 | #include "ctree.h" |
22 | #include "volumes.h" | |
23 | #include "disk-io.h" | |
24 | #include "ordered-data.h" | |
0ef8e451 | 25 | #include "transaction.h" |
558540c1 | 26 | #include "backref.h" |
a2de733c AJ |
27 | |
28 | /* | |
29 | * This is only the first step towards a full-features scrub. It reads all | |
30 | * extent and super block and verifies the checksums. In case a bad checksum | |
31 | * is found or the extent cannot be read, good data will be written back if | |
32 | * any can be found. | |
33 | * | |
34 | * Future enhancements: | |
35 | * - To enhance the performance, better read-ahead strategies for the | |
36 | * extent-tree can be employed. | |
37 | * - In case an unrepairable extent is encountered, track which files are | |
38 | * affected and report them | |
39 | * - In case of a read error on files with nodatasum, map the file and read | |
40 | * the extent to trigger a writeback of the good copy | |
41 | * - track and record media errors, throw out bad devices | |
a2de733c AJ |
42 | * - add a mode to also read unallocated space |
43 | * - make the prefetch cancellable | |
44 | */ | |
45 | ||
46 | struct scrub_bio; | |
47 | struct scrub_page; | |
48 | struct scrub_dev; | |
a2de733c AJ |
49 | static void scrub_bio_end_io(struct bio *bio, int err); |
50 | static void scrub_checksum(struct btrfs_work *work); | |
51 | static int scrub_checksum_data(struct scrub_dev *sdev, | |
52 | struct scrub_page *spag, void *buffer); | |
53 | static int scrub_checksum_tree_block(struct scrub_dev *sdev, | |
54 | struct scrub_page *spag, u64 logical, | |
55 | void *buffer); | |
56 | static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer); | |
96e36920 ID |
57 | static int scrub_fixup_check(struct scrub_bio *sbio, int ix); |
58 | static void scrub_fixup_end_io(struct bio *bio, int err); | |
59 | static int scrub_fixup_io(int rw, struct block_device *bdev, sector_t sector, | |
60 | struct page *page); | |
61 | static void scrub_fixup(struct scrub_bio *sbio, int ix); | |
a2de733c AJ |
62 | |
63 | #define SCRUB_PAGES_PER_BIO 16 /* 64k per bio */ | |
64 | #define SCRUB_BIOS_PER_DEV 16 /* 1 MB per device in flight */ | |
65 | ||
66 | struct scrub_page { | |
67 | u64 flags; /* extent flags */ | |
68 | u64 generation; | |
e12fa9cd | 69 | int mirror_num; |
a2de733c AJ |
70 | int have_csum; |
71 | u8 csum[BTRFS_CSUM_SIZE]; | |
72 | }; | |
73 | ||
74 | struct scrub_bio { | |
75 | int index; | |
76 | struct scrub_dev *sdev; | |
77 | struct bio *bio; | |
78 | int err; | |
79 | u64 logical; | |
80 | u64 physical; | |
81 | struct scrub_page spag[SCRUB_PAGES_PER_BIO]; | |
82 | u64 count; | |
83 | int next_free; | |
84 | struct btrfs_work work; | |
85 | }; | |
86 | ||
87 | struct scrub_dev { | |
88 | struct scrub_bio *bios[SCRUB_BIOS_PER_DEV]; | |
89 | struct btrfs_device *dev; | |
90 | int first_free; | |
91 | int curr; | |
92 | atomic_t in_flight; | |
0ef8e451 | 93 | atomic_t fixup_cnt; |
a2de733c AJ |
94 | spinlock_t list_lock; |
95 | wait_queue_head_t list_wait; | |
96 | u16 csum_size; | |
97 | struct list_head csum_list; | |
98 | atomic_t cancel_req; | |
8628764e | 99 | int readonly; |
a2de733c AJ |
100 | /* |
101 | * statistics | |
102 | */ | |
103 | struct btrfs_scrub_progress stat; | |
104 | spinlock_t stat_lock; | |
105 | }; | |
106 | ||
0ef8e451 JS |
107 | struct scrub_fixup_nodatasum { |
108 | struct scrub_dev *sdev; | |
109 | u64 logical; | |
110 | struct btrfs_root *root; | |
111 | struct btrfs_work work; | |
112 | int mirror_num; | |
113 | }; | |
114 | ||
558540c1 JS |
115 | struct scrub_warning { |
116 | struct btrfs_path *path; | |
117 | u64 extent_item_size; | |
118 | char *scratch_buf; | |
119 | char *msg_buf; | |
120 | const char *errstr; | |
121 | sector_t sector; | |
122 | u64 logical; | |
123 | struct btrfs_device *dev; | |
124 | int msg_bufsize; | |
125 | int scratch_bufsize; | |
126 | }; | |
127 | ||
a2de733c AJ |
128 | static void scrub_free_csums(struct scrub_dev *sdev) |
129 | { | |
130 | while (!list_empty(&sdev->csum_list)) { | |
131 | struct btrfs_ordered_sum *sum; | |
132 | sum = list_first_entry(&sdev->csum_list, | |
133 | struct btrfs_ordered_sum, list); | |
134 | list_del(&sum->list); | |
135 | kfree(sum); | |
136 | } | |
137 | } | |
138 | ||
1bc87793 AJ |
139 | static void scrub_free_bio(struct bio *bio) |
140 | { | |
141 | int i; | |
142 | struct page *last_page = NULL; | |
143 | ||
144 | if (!bio) | |
145 | return; | |
146 | ||
147 | for (i = 0; i < bio->bi_vcnt; ++i) { | |
148 | if (bio->bi_io_vec[i].bv_page == last_page) | |
149 | continue; | |
150 | last_page = bio->bi_io_vec[i].bv_page; | |
151 | __free_page(last_page); | |
152 | } | |
153 | bio_put(bio); | |
154 | } | |
155 | ||
a2de733c AJ |
156 | static noinline_for_stack void scrub_free_dev(struct scrub_dev *sdev) |
157 | { | |
158 | int i; | |
a2de733c AJ |
159 | |
160 | if (!sdev) | |
161 | return; | |
162 | ||
163 | for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) { | |
164 | struct scrub_bio *sbio = sdev->bios[i]; | |
a2de733c AJ |
165 | |
166 | if (!sbio) | |
167 | break; | |
168 | ||
1bc87793 | 169 | scrub_free_bio(sbio->bio); |
a2de733c AJ |
170 | kfree(sbio); |
171 | } | |
172 | ||
173 | scrub_free_csums(sdev); | |
174 | kfree(sdev); | |
175 | } | |
176 | ||
177 | static noinline_for_stack | |
178 | struct scrub_dev *scrub_setup_dev(struct btrfs_device *dev) | |
179 | { | |
180 | struct scrub_dev *sdev; | |
181 | int i; | |
a2de733c AJ |
182 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
183 | ||
184 | sdev = kzalloc(sizeof(*sdev), GFP_NOFS); | |
185 | if (!sdev) | |
186 | goto nomem; | |
187 | sdev->dev = dev; | |
188 | for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) { | |
a2de733c AJ |
189 | struct scrub_bio *sbio; |
190 | ||
191 | sbio = kzalloc(sizeof(*sbio), GFP_NOFS); | |
192 | if (!sbio) | |
193 | goto nomem; | |
194 | sdev->bios[i] = sbio; | |
195 | ||
a2de733c AJ |
196 | sbio->index = i; |
197 | sbio->sdev = sdev; | |
a2de733c AJ |
198 | sbio->count = 0; |
199 | sbio->work.func = scrub_checksum; | |
a2de733c AJ |
200 | |
201 | if (i != SCRUB_BIOS_PER_DEV-1) | |
202 | sdev->bios[i]->next_free = i + 1; | |
0ef8e451 | 203 | else |
a2de733c AJ |
204 | sdev->bios[i]->next_free = -1; |
205 | } | |
206 | sdev->first_free = 0; | |
207 | sdev->curr = -1; | |
208 | atomic_set(&sdev->in_flight, 0); | |
0ef8e451 | 209 | atomic_set(&sdev->fixup_cnt, 0); |
a2de733c AJ |
210 | atomic_set(&sdev->cancel_req, 0); |
211 | sdev->csum_size = btrfs_super_csum_size(&fs_info->super_copy); | |
212 | INIT_LIST_HEAD(&sdev->csum_list); | |
213 | ||
214 | spin_lock_init(&sdev->list_lock); | |
215 | spin_lock_init(&sdev->stat_lock); | |
216 | init_waitqueue_head(&sdev->list_wait); | |
217 | return sdev; | |
218 | ||
219 | nomem: | |
220 | scrub_free_dev(sdev); | |
221 | return ERR_PTR(-ENOMEM); | |
222 | } | |
223 | ||
558540c1 JS |
224 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, void *ctx) |
225 | { | |
226 | u64 isize; | |
227 | u32 nlink; | |
228 | int ret; | |
229 | int i; | |
230 | struct extent_buffer *eb; | |
231 | struct btrfs_inode_item *inode_item; | |
232 | struct scrub_warning *swarn = ctx; | |
233 | struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; | |
234 | struct inode_fs_paths *ipath = NULL; | |
235 | struct btrfs_root *local_root; | |
236 | struct btrfs_key root_key; | |
237 | ||
238 | root_key.objectid = root; | |
239 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
240 | root_key.offset = (u64)-1; | |
241 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
242 | if (IS_ERR(local_root)) { | |
243 | ret = PTR_ERR(local_root); | |
244 | goto err; | |
245 | } | |
246 | ||
247 | ret = inode_item_info(inum, 0, local_root, swarn->path); | |
248 | if (ret) { | |
249 | btrfs_release_path(swarn->path); | |
250 | goto err; | |
251 | } | |
252 | ||
253 | eb = swarn->path->nodes[0]; | |
254 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], | |
255 | struct btrfs_inode_item); | |
256 | isize = btrfs_inode_size(eb, inode_item); | |
257 | nlink = btrfs_inode_nlink(eb, inode_item); | |
258 | btrfs_release_path(swarn->path); | |
259 | ||
260 | ipath = init_ipath(4096, local_root, swarn->path); | |
261 | ret = paths_from_inode(inum, ipath); | |
262 | ||
263 | if (ret < 0) | |
264 | goto err; | |
265 | ||
266 | /* | |
267 | * we deliberately ignore the bit ipath might have been too small to | |
268 | * hold all of the paths here | |
269 | */ | |
270 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) | |
271 | printk(KERN_WARNING "btrfs: %s at logical %llu on dev " | |
272 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " | |
273 | "length %llu, links %u (path: %s)\n", swarn->errstr, | |
274 | swarn->logical, swarn->dev->name, | |
275 | (unsigned long long)swarn->sector, root, inum, offset, | |
276 | min(isize - offset, (u64)PAGE_SIZE), nlink, | |
277 | ipath->fspath->str[i]); | |
278 | ||
279 | free_ipath(ipath); | |
280 | return 0; | |
281 | ||
282 | err: | |
283 | printk(KERN_WARNING "btrfs: %s at logical %llu on dev " | |
284 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " | |
285 | "resolving failed with ret=%d\n", swarn->errstr, | |
286 | swarn->logical, swarn->dev->name, | |
287 | (unsigned long long)swarn->sector, root, inum, offset, ret); | |
288 | ||
289 | free_ipath(ipath); | |
290 | return 0; | |
291 | } | |
292 | ||
293 | static void scrub_print_warning(const char *errstr, struct scrub_bio *sbio, | |
294 | int ix) | |
295 | { | |
296 | struct btrfs_device *dev = sbio->sdev->dev; | |
297 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; | |
298 | struct btrfs_path *path; | |
299 | struct btrfs_key found_key; | |
300 | struct extent_buffer *eb; | |
301 | struct btrfs_extent_item *ei; | |
302 | struct scrub_warning swarn; | |
303 | u32 item_size; | |
304 | int ret; | |
305 | u64 ref_root; | |
306 | u8 ref_level; | |
307 | unsigned long ptr = 0; | |
308 | const int bufsize = 4096; | |
309 | u64 extent_offset; | |
310 | ||
311 | path = btrfs_alloc_path(); | |
312 | ||
313 | swarn.scratch_buf = kmalloc(bufsize, GFP_NOFS); | |
314 | swarn.msg_buf = kmalloc(bufsize, GFP_NOFS); | |
315 | swarn.sector = (sbio->physical + ix * PAGE_SIZE) >> 9; | |
316 | swarn.logical = sbio->logical + ix * PAGE_SIZE; | |
317 | swarn.errstr = errstr; | |
318 | swarn.dev = dev; | |
319 | swarn.msg_bufsize = bufsize; | |
320 | swarn.scratch_bufsize = bufsize; | |
321 | ||
322 | if (!path || !swarn.scratch_buf || !swarn.msg_buf) | |
323 | goto out; | |
324 | ||
325 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key); | |
326 | if (ret < 0) | |
327 | goto out; | |
328 | ||
329 | extent_offset = swarn.logical - found_key.objectid; | |
330 | swarn.extent_item_size = found_key.offset; | |
331 | ||
332 | eb = path->nodes[0]; | |
333 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); | |
334 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
335 | ||
336 | if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
337 | do { | |
338 | ret = tree_backref_for_extent(&ptr, eb, ei, item_size, | |
339 | &ref_root, &ref_level); | |
340 | printk(KERN_WARNING "%s at logical %llu on dev %s, " | |
341 | "sector %llu: metadata %s (level %d) in tree " | |
342 | "%llu\n", errstr, swarn.logical, dev->name, | |
343 | (unsigned long long)swarn.sector, | |
344 | ref_level ? "node" : "leaf", | |
345 | ret < 0 ? -1 : ref_level, | |
346 | ret < 0 ? -1 : ref_root); | |
347 | } while (ret != 1); | |
348 | } else { | |
349 | swarn.path = path; | |
350 | iterate_extent_inodes(fs_info, path, found_key.objectid, | |
351 | extent_offset, | |
352 | scrub_print_warning_inode, &swarn); | |
353 | } | |
354 | ||
355 | out: | |
356 | btrfs_free_path(path); | |
357 | kfree(swarn.scratch_buf); | |
358 | kfree(swarn.msg_buf); | |
359 | } | |
360 | ||
0ef8e451 JS |
361 | static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *ctx) |
362 | { | |
363 | struct page *page; | |
364 | unsigned long index; | |
365 | struct scrub_fixup_nodatasum *fixup = ctx; | |
366 | int ret; | |
367 | int corrected; | |
368 | struct btrfs_key key; | |
369 | struct inode *inode; | |
370 | u64 end = offset + PAGE_SIZE - 1; | |
371 | struct btrfs_root *local_root; | |
372 | ||
373 | key.objectid = root; | |
374 | key.type = BTRFS_ROOT_ITEM_KEY; | |
375 | key.offset = (u64)-1; | |
376 | local_root = btrfs_read_fs_root_no_name(fixup->root->fs_info, &key); | |
377 | if (IS_ERR(local_root)) | |
378 | return PTR_ERR(local_root); | |
379 | ||
380 | key.type = BTRFS_INODE_ITEM_KEY; | |
381 | key.objectid = inum; | |
382 | key.offset = 0; | |
383 | inode = btrfs_iget(fixup->root->fs_info->sb, &key, local_root, NULL); | |
384 | if (IS_ERR(inode)) | |
385 | return PTR_ERR(inode); | |
386 | ||
387 | ret = set_extent_bit(&BTRFS_I(inode)->io_tree, offset, end, | |
388 | EXTENT_DAMAGED, 0, NULL, NULL, GFP_NOFS); | |
389 | ||
390 | /* set_extent_bit should either succeed or give proper error */ | |
391 | WARN_ON(ret > 0); | |
392 | if (ret) | |
393 | return ret < 0 ? ret : -EFAULT; | |
394 | ||
395 | index = offset >> PAGE_CACHE_SHIFT; | |
396 | ||
397 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
398 | if (!page) | |
399 | return -ENOMEM; | |
400 | ||
401 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, | |
402 | btrfs_get_extent, fixup->mirror_num); | |
403 | wait_on_page_locked(page); | |
404 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, end, | |
405 | EXTENT_DAMAGED, 0, NULL); | |
406 | ||
407 | if (corrected) | |
408 | WARN_ON(!PageUptodate(page)); | |
409 | else | |
410 | clear_extent_bit(&BTRFS_I(inode)->io_tree, offset, end, | |
411 | EXTENT_DAMAGED, 0, 0, NULL, GFP_NOFS); | |
412 | ||
413 | put_page(page); | |
414 | iput(inode); | |
415 | ||
416 | if (ret < 0) | |
417 | return ret; | |
418 | ||
419 | if (ret == 0 && corrected) { | |
420 | /* | |
421 | * we only need to call readpage for one of the inodes belonging | |
422 | * to this extent. so make iterate_extent_inodes stop | |
423 | */ | |
424 | return 1; | |
425 | } | |
426 | ||
427 | return -EIO; | |
428 | } | |
429 | ||
430 | static void scrub_fixup_nodatasum(struct btrfs_work *work) | |
431 | { | |
432 | int ret; | |
433 | struct scrub_fixup_nodatasum *fixup; | |
434 | struct scrub_dev *sdev; | |
435 | struct btrfs_trans_handle *trans = NULL; | |
436 | struct btrfs_fs_info *fs_info; | |
437 | struct btrfs_path *path; | |
438 | int uncorrectable = 0; | |
439 | ||
440 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); | |
441 | sdev = fixup->sdev; | |
442 | fs_info = fixup->root->fs_info; | |
443 | ||
444 | path = btrfs_alloc_path(); | |
445 | if (!path) { | |
446 | spin_lock(&sdev->stat_lock); | |
447 | ++sdev->stat.malloc_errors; | |
448 | spin_unlock(&sdev->stat_lock); | |
449 | uncorrectable = 1; | |
450 | goto out; | |
451 | } | |
452 | ||
453 | trans = btrfs_join_transaction(fixup->root); | |
454 | if (IS_ERR(trans)) { | |
455 | uncorrectable = 1; | |
456 | goto out; | |
457 | } | |
458 | ||
459 | /* | |
460 | * the idea is to trigger a regular read through the standard path. we | |
461 | * read a page from the (failed) logical address by specifying the | |
462 | * corresponding copynum of the failed sector. thus, that readpage is | |
463 | * expected to fail. | |
464 | * that is the point where on-the-fly error correction will kick in | |
465 | * (once it's finished) and rewrite the failed sector if a good copy | |
466 | * can be found. | |
467 | */ | |
468 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, | |
469 | path, scrub_fixup_readpage, | |
470 | fixup); | |
471 | if (ret < 0) { | |
472 | uncorrectable = 1; | |
473 | goto out; | |
474 | } | |
475 | WARN_ON(ret != 1); | |
476 | ||
477 | spin_lock(&sdev->stat_lock); | |
478 | ++sdev->stat.corrected_errors; | |
479 | spin_unlock(&sdev->stat_lock); | |
480 | ||
481 | out: | |
482 | if (trans && !IS_ERR(trans)) | |
483 | btrfs_end_transaction(trans, fixup->root); | |
484 | if (uncorrectable) { | |
485 | spin_lock(&sdev->stat_lock); | |
486 | ++sdev->stat.uncorrectable_errors; | |
487 | spin_unlock(&sdev->stat_lock); | |
488 | printk_ratelimited(KERN_ERR "btrfs: unable to fixup " | |
489 | "(nodatasum) error at logical %llu\n", | |
490 | fixup->logical); | |
491 | } | |
492 | ||
493 | btrfs_free_path(path); | |
494 | kfree(fixup); | |
495 | ||
496 | /* see caller why we're pretending to be paused in the scrub counters */ | |
497 | mutex_lock(&fs_info->scrub_lock); | |
498 | atomic_dec(&fs_info->scrubs_running); | |
499 | atomic_dec(&fs_info->scrubs_paused); | |
500 | mutex_unlock(&fs_info->scrub_lock); | |
501 | atomic_dec(&sdev->fixup_cnt); | |
502 | wake_up(&fs_info->scrub_pause_wait); | |
503 | wake_up(&sdev->list_wait); | |
504 | } | |
505 | ||
a2de733c AJ |
506 | /* |
507 | * scrub_recheck_error gets called when either verification of the page | |
508 | * failed or the bio failed to read, e.g. with EIO. In the latter case, | |
509 | * recheck_error gets called for every page in the bio, even though only | |
510 | * one may be bad | |
511 | */ | |
13db62b7 | 512 | static int scrub_recheck_error(struct scrub_bio *sbio, int ix) |
a2de733c | 513 | { |
13db62b7 JS |
514 | struct scrub_dev *sdev = sbio->sdev; |
515 | u64 sector = (sbio->physical + ix * PAGE_SIZE) >> 9; | |
558540c1 JS |
516 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
517 | DEFAULT_RATELIMIT_BURST); | |
13db62b7 | 518 | |
96e36920 | 519 | if (sbio->err) { |
13db62b7 | 520 | if (scrub_fixup_io(READ, sbio->sdev->dev->bdev, sector, |
96e36920 ID |
521 | sbio->bio->bi_io_vec[ix].bv_page) == 0) { |
522 | if (scrub_fixup_check(sbio, ix) == 0) | |
13db62b7 | 523 | return 0; |
96e36920 | 524 | } |
558540c1 JS |
525 | if (__ratelimit(&_rs)) |
526 | scrub_print_warning("i/o error", sbio, ix); | |
527 | } else { | |
528 | if (__ratelimit(&_rs)) | |
529 | scrub_print_warning("checksum error", sbio, ix); | |
a2de733c AJ |
530 | } |
531 | ||
13db62b7 JS |
532 | spin_lock(&sdev->stat_lock); |
533 | ++sdev->stat.read_errors; | |
534 | spin_unlock(&sdev->stat_lock); | |
535 | ||
96e36920 | 536 | scrub_fixup(sbio, ix); |
13db62b7 | 537 | return 1; |
a2de733c AJ |
538 | } |
539 | ||
96e36920 | 540 | static int scrub_fixup_check(struct scrub_bio *sbio, int ix) |
a2de733c AJ |
541 | { |
542 | int ret = 1; | |
543 | struct page *page; | |
544 | void *buffer; | |
96e36920 | 545 | u64 flags = sbio->spag[ix].flags; |
a2de733c | 546 | |
96e36920 | 547 | page = sbio->bio->bi_io_vec[ix].bv_page; |
a2de733c AJ |
548 | buffer = kmap_atomic(page, KM_USER0); |
549 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
96e36920 ID |
550 | ret = scrub_checksum_data(sbio->sdev, |
551 | sbio->spag + ix, buffer); | |
a2de733c | 552 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
96e36920 ID |
553 | ret = scrub_checksum_tree_block(sbio->sdev, |
554 | sbio->spag + ix, | |
555 | sbio->logical + ix * PAGE_SIZE, | |
a2de733c AJ |
556 | buffer); |
557 | } else { | |
558 | WARN_ON(1); | |
559 | } | |
560 | kunmap_atomic(buffer, KM_USER0); | |
561 | ||
562 | return ret; | |
563 | } | |
564 | ||
a2de733c AJ |
565 | static void scrub_fixup_end_io(struct bio *bio, int err) |
566 | { | |
567 | complete((struct completion *)bio->bi_private); | |
568 | } | |
569 | ||
96e36920 | 570 | static void scrub_fixup(struct scrub_bio *sbio, int ix) |
a2de733c | 571 | { |
96e36920 | 572 | struct scrub_dev *sdev = sbio->sdev; |
a2de733c AJ |
573 | struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info; |
574 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; | |
a1d3c478 | 575 | struct btrfs_bio *bbio = NULL; |
0ef8e451 | 576 | struct scrub_fixup_nodatasum *fixup; |
96e36920 | 577 | u64 logical = sbio->logical + ix * PAGE_SIZE; |
a2de733c AJ |
578 | u64 length; |
579 | int i; | |
580 | int ret; | |
581 | DECLARE_COMPLETION_ONSTACK(complete); | |
582 | ||
96e36920 ID |
583 | if ((sbio->spag[ix].flags & BTRFS_EXTENT_FLAG_DATA) && |
584 | (sbio->spag[ix].have_csum == 0)) { | |
0ef8e451 JS |
585 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); |
586 | if (!fixup) | |
587 | goto uncorrectable; | |
588 | fixup->sdev = sdev; | |
589 | fixup->logical = logical; | |
590 | fixup->root = fs_info->extent_root; | |
591 | fixup->mirror_num = sbio->spag[ix].mirror_num; | |
a2de733c | 592 | /* |
0ef8e451 JS |
593 | * increment scrubs_running to prevent cancel requests from |
594 | * completing as long as a fixup worker is running. we must also | |
595 | * increment scrubs_paused to prevent deadlocking on pause | |
596 | * requests used for transactions commits (as the worker uses a | |
597 | * transaction context). it is safe to regard the fixup worker | |
598 | * as paused for all matters practical. effectively, we only | |
599 | * avoid cancellation requests from completing. | |
a2de733c | 600 | */ |
0ef8e451 JS |
601 | mutex_lock(&fs_info->scrub_lock); |
602 | atomic_inc(&fs_info->scrubs_running); | |
603 | atomic_inc(&fs_info->scrubs_paused); | |
604 | mutex_unlock(&fs_info->scrub_lock); | |
605 | atomic_inc(&sdev->fixup_cnt); | |
606 | fixup->work.func = scrub_fixup_nodatasum; | |
607 | btrfs_queue_worker(&fs_info->scrub_workers, &fixup->work); | |
608 | return; | |
a2de733c AJ |
609 | } |
610 | ||
611 | length = PAGE_SIZE; | |
96e36920 | 612 | ret = btrfs_map_block(map_tree, REQ_WRITE, logical, &length, |
a1d3c478 JS |
613 | &bbio, 0); |
614 | if (ret || !bbio || length < PAGE_SIZE) { | |
a2de733c AJ |
615 | printk(KERN_ERR |
616 | "scrub_fixup: btrfs_map_block failed us for %llu\n", | |
96e36920 | 617 | (unsigned long long)logical); |
a2de733c AJ |
618 | WARN_ON(1); |
619 | return; | |
620 | } | |
621 | ||
a1d3c478 | 622 | if (bbio->num_stripes == 1) |
a2de733c AJ |
623 | /* there aren't any replicas */ |
624 | goto uncorrectable; | |
a2de733c AJ |
625 | |
626 | /* | |
627 | * first find a good copy | |
628 | */ | |
a1d3c478 | 629 | for (i = 0; i < bbio->num_stripes; ++i) { |
193ea74b | 630 | if (i + 1 == sbio->spag[ix].mirror_num) |
a2de733c AJ |
631 | continue; |
632 | ||
a1d3c478 JS |
633 | if (scrub_fixup_io(READ, bbio->stripes[i].dev->bdev, |
634 | bbio->stripes[i].physical >> 9, | |
96e36920 | 635 | sbio->bio->bi_io_vec[ix].bv_page)) { |
a2de733c AJ |
636 | /* I/O-error, this is not a good copy */ |
637 | continue; | |
96e36920 | 638 | } |
a2de733c | 639 | |
96e36920 | 640 | if (scrub_fixup_check(sbio, ix) == 0) |
a2de733c AJ |
641 | break; |
642 | } | |
a1d3c478 | 643 | if (i == bbio->num_stripes) |
a2de733c AJ |
644 | goto uncorrectable; |
645 | ||
8628764e AJ |
646 | if (!sdev->readonly) { |
647 | /* | |
648 | * bi_io_vec[ix].bv_page now contains good data, write it back | |
649 | */ | |
650 | if (scrub_fixup_io(WRITE, sdev->dev->bdev, | |
651 | (sbio->physical + ix * PAGE_SIZE) >> 9, | |
652 | sbio->bio->bi_io_vec[ix].bv_page)) { | |
653 | /* I/O-error, writeback failed, give up */ | |
654 | goto uncorrectable; | |
655 | } | |
96e36920 | 656 | } |
a2de733c | 657 | |
a1d3c478 | 658 | kfree(bbio); |
a2de733c AJ |
659 | spin_lock(&sdev->stat_lock); |
660 | ++sdev->stat.corrected_errors; | |
661 | spin_unlock(&sdev->stat_lock); | |
662 | ||
558540c1 JS |
663 | printk_ratelimited(KERN_ERR "btrfs: fixed up error at logical %llu\n", |
664 | (unsigned long long)logical); | |
a2de733c AJ |
665 | return; |
666 | ||
667 | uncorrectable: | |
a1d3c478 | 668 | kfree(bbio); |
a2de733c AJ |
669 | spin_lock(&sdev->stat_lock); |
670 | ++sdev->stat.uncorrectable_errors; | |
671 | spin_unlock(&sdev->stat_lock); | |
672 | ||
558540c1 JS |
673 | printk_ratelimited(KERN_ERR "btrfs: unable to fixup (regular) error at " |
674 | "logical %llu\n", (unsigned long long)logical); | |
96e36920 ID |
675 | } |
676 | ||
677 | static int scrub_fixup_io(int rw, struct block_device *bdev, sector_t sector, | |
678 | struct page *page) | |
679 | { | |
680 | struct bio *bio = NULL; | |
681 | int ret; | |
682 | DECLARE_COMPLETION_ONSTACK(complete); | |
683 | ||
96e36920 ID |
684 | bio = bio_alloc(GFP_NOFS, 1); |
685 | bio->bi_bdev = bdev; | |
686 | bio->bi_sector = sector; | |
687 | bio_add_page(bio, page, PAGE_SIZE, 0); | |
688 | bio->bi_end_io = scrub_fixup_end_io; | |
689 | bio->bi_private = &complete; | |
690 | submit_bio(rw, bio); | |
691 | ||
e7786c3a | 692 | /* this will also unplug the queue */ |
96e36920 ID |
693 | wait_for_completion(&complete); |
694 | ||
695 | ret = !test_bit(BIO_UPTODATE, &bio->bi_flags); | |
696 | bio_put(bio); | |
697 | return ret; | |
a2de733c AJ |
698 | } |
699 | ||
700 | static void scrub_bio_end_io(struct bio *bio, int err) | |
701 | { | |
702 | struct scrub_bio *sbio = bio->bi_private; | |
703 | struct scrub_dev *sdev = sbio->sdev; | |
704 | struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info; | |
705 | ||
706 | sbio->err = err; | |
1bc87793 | 707 | sbio->bio = bio; |
a2de733c AJ |
708 | |
709 | btrfs_queue_worker(&fs_info->scrub_workers, &sbio->work); | |
710 | } | |
711 | ||
712 | static void scrub_checksum(struct btrfs_work *work) | |
713 | { | |
714 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
715 | struct scrub_dev *sdev = sbio->sdev; | |
716 | struct page *page; | |
717 | void *buffer; | |
718 | int i; | |
719 | u64 flags; | |
720 | u64 logical; | |
721 | int ret; | |
722 | ||
723 | if (sbio->err) { | |
13db62b7 | 724 | ret = 0; |
a2de733c | 725 | for (i = 0; i < sbio->count; ++i) |
13db62b7 JS |
726 | ret |= scrub_recheck_error(sbio, i); |
727 | if (!ret) { | |
728 | spin_lock(&sdev->stat_lock); | |
729 | ++sdev->stat.unverified_errors; | |
730 | spin_unlock(&sdev->stat_lock); | |
731 | } | |
96e36920 ID |
732 | |
733 | sbio->bio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
734 | sbio->bio->bi_flags |= 1 << BIO_UPTODATE; | |
735 | sbio->bio->bi_phys_segments = 0; | |
736 | sbio->bio->bi_idx = 0; | |
737 | ||
738 | for (i = 0; i < sbio->count; i++) { | |
739 | struct bio_vec *bi; | |
740 | bi = &sbio->bio->bi_io_vec[i]; | |
741 | bi->bv_offset = 0; | |
742 | bi->bv_len = PAGE_SIZE; | |
743 | } | |
a2de733c AJ |
744 | goto out; |
745 | } | |
746 | for (i = 0; i < sbio->count; ++i) { | |
747 | page = sbio->bio->bi_io_vec[i].bv_page; | |
748 | buffer = kmap_atomic(page, KM_USER0); | |
749 | flags = sbio->spag[i].flags; | |
750 | logical = sbio->logical + i * PAGE_SIZE; | |
751 | ret = 0; | |
752 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
753 | ret = scrub_checksum_data(sdev, sbio->spag + i, buffer); | |
754 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
755 | ret = scrub_checksum_tree_block(sdev, sbio->spag + i, | |
756 | logical, buffer); | |
757 | } else if (flags & BTRFS_EXTENT_FLAG_SUPER) { | |
758 | BUG_ON(i); | |
759 | (void)scrub_checksum_super(sbio, buffer); | |
760 | } else { | |
761 | WARN_ON(1); | |
762 | } | |
763 | kunmap_atomic(buffer, KM_USER0); | |
13db62b7 JS |
764 | if (ret) { |
765 | ret = scrub_recheck_error(sbio, i); | |
766 | if (!ret) { | |
767 | spin_lock(&sdev->stat_lock); | |
768 | ++sdev->stat.unverified_errors; | |
769 | spin_unlock(&sdev->stat_lock); | |
770 | } | |
771 | } | |
a2de733c AJ |
772 | } |
773 | ||
774 | out: | |
1bc87793 AJ |
775 | scrub_free_bio(sbio->bio); |
776 | sbio->bio = NULL; | |
a2de733c AJ |
777 | spin_lock(&sdev->list_lock); |
778 | sbio->next_free = sdev->first_free; | |
779 | sdev->first_free = sbio->index; | |
780 | spin_unlock(&sdev->list_lock); | |
a2de733c AJ |
781 | atomic_dec(&sdev->in_flight); |
782 | wake_up(&sdev->list_wait); | |
783 | } | |
784 | ||
785 | static int scrub_checksum_data(struct scrub_dev *sdev, | |
786 | struct scrub_page *spag, void *buffer) | |
787 | { | |
788 | u8 csum[BTRFS_CSUM_SIZE]; | |
789 | u32 crc = ~(u32)0; | |
790 | int fail = 0; | |
791 | struct btrfs_root *root = sdev->dev->dev_root; | |
792 | ||
793 | if (!spag->have_csum) | |
794 | return 0; | |
795 | ||
796 | crc = btrfs_csum_data(root, buffer, crc, PAGE_SIZE); | |
797 | btrfs_csum_final(crc, csum); | |
798 | if (memcmp(csum, spag->csum, sdev->csum_size)) | |
799 | fail = 1; | |
800 | ||
801 | spin_lock(&sdev->stat_lock); | |
802 | ++sdev->stat.data_extents_scrubbed; | |
803 | sdev->stat.data_bytes_scrubbed += PAGE_SIZE; | |
804 | if (fail) | |
805 | ++sdev->stat.csum_errors; | |
806 | spin_unlock(&sdev->stat_lock); | |
807 | ||
808 | return fail; | |
809 | } | |
810 | ||
811 | static int scrub_checksum_tree_block(struct scrub_dev *sdev, | |
812 | struct scrub_page *spag, u64 logical, | |
813 | void *buffer) | |
814 | { | |
815 | struct btrfs_header *h; | |
816 | struct btrfs_root *root = sdev->dev->dev_root; | |
817 | struct btrfs_fs_info *fs_info = root->fs_info; | |
818 | u8 csum[BTRFS_CSUM_SIZE]; | |
819 | u32 crc = ~(u32)0; | |
820 | int fail = 0; | |
821 | int crc_fail = 0; | |
822 | ||
823 | /* | |
824 | * we don't use the getter functions here, as we | |
825 | * a) don't have an extent buffer and | |
826 | * b) the page is already kmapped | |
827 | */ | |
828 | h = (struct btrfs_header *)buffer; | |
829 | ||
830 | if (logical != le64_to_cpu(h->bytenr)) | |
831 | ++fail; | |
832 | ||
833 | if (spag->generation != le64_to_cpu(h->generation)) | |
834 | ++fail; | |
835 | ||
836 | if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) | |
837 | ++fail; | |
838 | ||
839 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
840 | BTRFS_UUID_SIZE)) | |
841 | ++fail; | |
842 | ||
843 | crc = btrfs_csum_data(root, buffer + BTRFS_CSUM_SIZE, crc, | |
844 | PAGE_SIZE - BTRFS_CSUM_SIZE); | |
845 | btrfs_csum_final(crc, csum); | |
846 | if (memcmp(csum, h->csum, sdev->csum_size)) | |
847 | ++crc_fail; | |
848 | ||
849 | spin_lock(&sdev->stat_lock); | |
850 | ++sdev->stat.tree_extents_scrubbed; | |
851 | sdev->stat.tree_bytes_scrubbed += PAGE_SIZE; | |
852 | if (crc_fail) | |
853 | ++sdev->stat.csum_errors; | |
854 | if (fail) | |
855 | ++sdev->stat.verify_errors; | |
856 | spin_unlock(&sdev->stat_lock); | |
857 | ||
858 | return fail || crc_fail; | |
859 | } | |
860 | ||
861 | static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer) | |
862 | { | |
863 | struct btrfs_super_block *s; | |
864 | u64 logical; | |
865 | struct scrub_dev *sdev = sbio->sdev; | |
866 | struct btrfs_root *root = sdev->dev->dev_root; | |
867 | struct btrfs_fs_info *fs_info = root->fs_info; | |
868 | u8 csum[BTRFS_CSUM_SIZE]; | |
869 | u32 crc = ~(u32)0; | |
870 | int fail = 0; | |
871 | ||
872 | s = (struct btrfs_super_block *)buffer; | |
873 | logical = sbio->logical; | |
874 | ||
875 | if (logical != le64_to_cpu(s->bytenr)) | |
876 | ++fail; | |
877 | ||
878 | if (sbio->spag[0].generation != le64_to_cpu(s->generation)) | |
879 | ++fail; | |
880 | ||
881 | if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) | |
882 | ++fail; | |
883 | ||
884 | crc = btrfs_csum_data(root, buffer + BTRFS_CSUM_SIZE, crc, | |
885 | PAGE_SIZE - BTRFS_CSUM_SIZE); | |
886 | btrfs_csum_final(crc, csum); | |
887 | if (memcmp(csum, s->csum, sbio->sdev->csum_size)) | |
888 | ++fail; | |
889 | ||
890 | if (fail) { | |
891 | /* | |
892 | * if we find an error in a super block, we just report it. | |
893 | * They will get written with the next transaction commit | |
894 | * anyway | |
895 | */ | |
896 | spin_lock(&sdev->stat_lock); | |
897 | ++sdev->stat.super_errors; | |
898 | spin_unlock(&sdev->stat_lock); | |
899 | } | |
900 | ||
901 | return fail; | |
902 | } | |
903 | ||
904 | static int scrub_submit(struct scrub_dev *sdev) | |
905 | { | |
906 | struct scrub_bio *sbio; | |
1bc87793 AJ |
907 | struct bio *bio; |
908 | int i; | |
a2de733c AJ |
909 | |
910 | if (sdev->curr == -1) | |
911 | return 0; | |
912 | ||
913 | sbio = sdev->bios[sdev->curr]; | |
914 | ||
1bc87793 AJ |
915 | bio = bio_alloc(GFP_NOFS, sbio->count); |
916 | if (!bio) | |
917 | goto nomem; | |
918 | ||
919 | bio->bi_private = sbio; | |
920 | bio->bi_end_io = scrub_bio_end_io; | |
921 | bio->bi_bdev = sdev->dev->bdev; | |
922 | bio->bi_sector = sbio->physical >> 9; | |
923 | ||
924 | for (i = 0; i < sbio->count; ++i) { | |
925 | struct page *page; | |
926 | int ret; | |
927 | ||
928 | page = alloc_page(GFP_NOFS); | |
929 | if (!page) | |
930 | goto nomem; | |
931 | ||
932 | ret = bio_add_page(bio, page, PAGE_SIZE, 0); | |
933 | if (!ret) { | |
934 | __free_page(page); | |
935 | goto nomem; | |
936 | } | |
937 | } | |
938 | ||
a2de733c AJ |
939 | sbio->err = 0; |
940 | sdev->curr = -1; | |
941 | atomic_inc(&sdev->in_flight); | |
942 | ||
1bc87793 | 943 | submit_bio(READ, bio); |
a2de733c AJ |
944 | |
945 | return 0; | |
1bc87793 AJ |
946 | |
947 | nomem: | |
948 | scrub_free_bio(bio); | |
949 | ||
950 | return -ENOMEM; | |
a2de733c AJ |
951 | } |
952 | ||
953 | static int scrub_page(struct scrub_dev *sdev, u64 logical, u64 len, | |
e12fa9cd | 954 | u64 physical, u64 flags, u64 gen, int mirror_num, |
a2de733c AJ |
955 | u8 *csum, int force) |
956 | { | |
957 | struct scrub_bio *sbio; | |
958 | ||
959 | again: | |
960 | /* | |
961 | * grab a fresh bio or wait for one to become available | |
962 | */ | |
963 | while (sdev->curr == -1) { | |
964 | spin_lock(&sdev->list_lock); | |
965 | sdev->curr = sdev->first_free; | |
966 | if (sdev->curr != -1) { | |
967 | sdev->first_free = sdev->bios[sdev->curr]->next_free; | |
968 | sdev->bios[sdev->curr]->next_free = -1; | |
969 | sdev->bios[sdev->curr]->count = 0; | |
970 | spin_unlock(&sdev->list_lock); | |
971 | } else { | |
972 | spin_unlock(&sdev->list_lock); | |
973 | wait_event(sdev->list_wait, sdev->first_free != -1); | |
974 | } | |
975 | } | |
976 | sbio = sdev->bios[sdev->curr]; | |
977 | if (sbio->count == 0) { | |
978 | sbio->physical = physical; | |
979 | sbio->logical = logical; | |
00d01bc1 AJ |
980 | } else if (sbio->physical + sbio->count * PAGE_SIZE != physical || |
981 | sbio->logical + sbio->count * PAGE_SIZE != logical) { | |
1bc87793 AJ |
982 | int ret; |
983 | ||
984 | ret = scrub_submit(sdev); | |
985 | if (ret) | |
986 | return ret; | |
a2de733c AJ |
987 | goto again; |
988 | } | |
989 | sbio->spag[sbio->count].flags = flags; | |
990 | sbio->spag[sbio->count].generation = gen; | |
991 | sbio->spag[sbio->count].have_csum = 0; | |
992 | sbio->spag[sbio->count].mirror_num = mirror_num; | |
993 | if (csum) { | |
994 | sbio->spag[sbio->count].have_csum = 1; | |
995 | memcpy(sbio->spag[sbio->count].csum, csum, sdev->csum_size); | |
996 | } | |
997 | ++sbio->count; | |
1bc87793 AJ |
998 | if (sbio->count == SCRUB_PAGES_PER_BIO || force) { |
999 | int ret; | |
1000 | ||
1001 | ret = scrub_submit(sdev); | |
1002 | if (ret) | |
1003 | return ret; | |
1004 | } | |
a2de733c AJ |
1005 | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | static int scrub_find_csum(struct scrub_dev *sdev, u64 logical, u64 len, | |
1010 | u8 *csum) | |
1011 | { | |
1012 | struct btrfs_ordered_sum *sum = NULL; | |
1013 | int ret = 0; | |
1014 | unsigned long i; | |
1015 | unsigned long num_sectors; | |
1016 | u32 sectorsize = sdev->dev->dev_root->sectorsize; | |
1017 | ||
1018 | while (!list_empty(&sdev->csum_list)) { | |
1019 | sum = list_first_entry(&sdev->csum_list, | |
1020 | struct btrfs_ordered_sum, list); | |
1021 | if (sum->bytenr > logical) | |
1022 | return 0; | |
1023 | if (sum->bytenr + sum->len > logical) | |
1024 | break; | |
1025 | ||
1026 | ++sdev->stat.csum_discards; | |
1027 | list_del(&sum->list); | |
1028 | kfree(sum); | |
1029 | sum = NULL; | |
1030 | } | |
1031 | if (!sum) | |
1032 | return 0; | |
1033 | ||
1034 | num_sectors = sum->len / sectorsize; | |
1035 | for (i = 0; i < num_sectors; ++i) { | |
1036 | if (sum->sums[i].bytenr == logical) { | |
1037 | memcpy(csum, &sum->sums[i].sum, sdev->csum_size); | |
1038 | ret = 1; | |
1039 | break; | |
1040 | } | |
1041 | } | |
1042 | if (ret && i == num_sectors - 1) { | |
1043 | list_del(&sum->list); | |
1044 | kfree(sum); | |
1045 | } | |
1046 | return ret; | |
1047 | } | |
1048 | ||
1049 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
1050 | static int scrub_extent(struct scrub_dev *sdev, u64 logical, u64 len, | |
e12fa9cd | 1051 | u64 physical, u64 flags, u64 gen, int mirror_num) |
a2de733c AJ |
1052 | { |
1053 | int ret; | |
1054 | u8 csum[BTRFS_CSUM_SIZE]; | |
1055 | ||
1056 | while (len) { | |
1057 | u64 l = min_t(u64, len, PAGE_SIZE); | |
1058 | int have_csum = 0; | |
1059 | ||
1060 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
1061 | /* push csums to sbio */ | |
1062 | have_csum = scrub_find_csum(sdev, logical, l, csum); | |
1063 | if (have_csum == 0) | |
1064 | ++sdev->stat.no_csum; | |
1065 | } | |
1066 | ret = scrub_page(sdev, logical, l, physical, flags, gen, | |
1067 | mirror_num, have_csum ? csum : NULL, 0); | |
1068 | if (ret) | |
1069 | return ret; | |
1070 | len -= l; | |
1071 | logical += l; | |
1072 | physical += l; | |
1073 | } | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | static noinline_for_stack int scrub_stripe(struct scrub_dev *sdev, | |
1078 | struct map_lookup *map, int num, u64 base, u64 length) | |
1079 | { | |
1080 | struct btrfs_path *path; | |
1081 | struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info; | |
1082 | struct btrfs_root *root = fs_info->extent_root; | |
1083 | struct btrfs_root *csum_root = fs_info->csum_root; | |
1084 | struct btrfs_extent_item *extent; | |
e7786c3a | 1085 | struct blk_plug plug; |
a2de733c AJ |
1086 | u64 flags; |
1087 | int ret; | |
1088 | int slot; | |
1089 | int i; | |
1090 | u64 nstripes; | |
1091 | int start_stripe; | |
1092 | struct extent_buffer *l; | |
1093 | struct btrfs_key key; | |
1094 | u64 physical; | |
1095 | u64 logical; | |
1096 | u64 generation; | |
e12fa9cd | 1097 | int mirror_num; |
a2de733c AJ |
1098 | |
1099 | u64 increment = map->stripe_len; | |
1100 | u64 offset; | |
1101 | ||
1102 | nstripes = length; | |
1103 | offset = 0; | |
1104 | do_div(nstripes, map->stripe_len); | |
1105 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
1106 | offset = map->stripe_len * num; | |
1107 | increment = map->stripe_len * map->num_stripes; | |
193ea74b | 1108 | mirror_num = 1; |
a2de733c AJ |
1109 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
1110 | int factor = map->num_stripes / map->sub_stripes; | |
1111 | offset = map->stripe_len * (num / map->sub_stripes); | |
1112 | increment = map->stripe_len * factor; | |
193ea74b | 1113 | mirror_num = num % map->sub_stripes + 1; |
a2de733c AJ |
1114 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
1115 | increment = map->stripe_len; | |
193ea74b | 1116 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
1117 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
1118 | increment = map->stripe_len; | |
193ea74b | 1119 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
1120 | } else { |
1121 | increment = map->stripe_len; | |
193ea74b | 1122 | mirror_num = 1; |
a2de733c AJ |
1123 | } |
1124 | ||
1125 | path = btrfs_alloc_path(); | |
1126 | if (!path) | |
1127 | return -ENOMEM; | |
1128 | ||
1129 | path->reada = 2; | |
1130 | path->search_commit_root = 1; | |
1131 | path->skip_locking = 1; | |
1132 | ||
1133 | /* | |
1134 | * find all extents for each stripe and just read them to get | |
1135 | * them into the page cache | |
1136 | * FIXME: we can do better. build a more intelligent prefetching | |
1137 | */ | |
1138 | logical = base + offset; | |
1139 | physical = map->stripes[num].physical; | |
1140 | ret = 0; | |
1141 | for (i = 0; i < nstripes; ++i) { | |
1142 | key.objectid = logical; | |
1143 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1144 | key.offset = (u64)0; | |
1145 | ||
1146 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1147 | if (ret < 0) | |
8c51032f | 1148 | goto out_noplug; |
a2de733c | 1149 | |
8c51032f AJ |
1150 | /* |
1151 | * we might miss half an extent here, but that doesn't matter, | |
1152 | * as it's only the prefetch | |
1153 | */ | |
a2de733c AJ |
1154 | while (1) { |
1155 | l = path->nodes[0]; | |
1156 | slot = path->slots[0]; | |
1157 | if (slot >= btrfs_header_nritems(l)) { | |
1158 | ret = btrfs_next_leaf(root, path); | |
1159 | if (ret == 0) | |
1160 | continue; | |
1161 | if (ret < 0) | |
8c51032f | 1162 | goto out_noplug; |
a2de733c AJ |
1163 | |
1164 | break; | |
1165 | } | |
1166 | btrfs_item_key_to_cpu(l, &key, slot); | |
1167 | ||
1168 | if (key.objectid >= logical + map->stripe_len) | |
1169 | break; | |
1170 | ||
1171 | path->slots[0]++; | |
1172 | } | |
71267333 | 1173 | btrfs_release_path(path); |
a2de733c AJ |
1174 | logical += increment; |
1175 | physical += map->stripe_len; | |
1176 | cond_resched(); | |
1177 | } | |
1178 | ||
1179 | /* | |
1180 | * collect all data csums for the stripe to avoid seeking during | |
1181 | * the scrub. This might currently (crc32) end up to be about 1MB | |
1182 | */ | |
1183 | start_stripe = 0; | |
e7786c3a | 1184 | blk_start_plug(&plug); |
a2de733c AJ |
1185 | again: |
1186 | logical = base + offset + start_stripe * increment; | |
1187 | for (i = start_stripe; i < nstripes; ++i) { | |
1188 | ret = btrfs_lookup_csums_range(csum_root, logical, | |
1189 | logical + map->stripe_len - 1, | |
1190 | &sdev->csum_list, 1); | |
1191 | if (ret) | |
1192 | goto out; | |
1193 | ||
1194 | logical += increment; | |
1195 | cond_resched(); | |
1196 | } | |
1197 | /* | |
1198 | * now find all extents for each stripe and scrub them | |
1199 | */ | |
1200 | logical = base + offset + start_stripe * increment; | |
1201 | physical = map->stripes[num].physical + start_stripe * map->stripe_len; | |
1202 | ret = 0; | |
1203 | for (i = start_stripe; i < nstripes; ++i) { | |
1204 | /* | |
1205 | * canceled? | |
1206 | */ | |
1207 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
1208 | atomic_read(&sdev->cancel_req)) { | |
1209 | ret = -ECANCELED; | |
1210 | goto out; | |
1211 | } | |
1212 | /* | |
1213 | * check to see if we have to pause | |
1214 | */ | |
1215 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
1216 | /* push queued extents */ | |
1217 | scrub_submit(sdev); | |
1218 | wait_event(sdev->list_wait, | |
1219 | atomic_read(&sdev->in_flight) == 0); | |
1220 | atomic_inc(&fs_info->scrubs_paused); | |
1221 | wake_up(&fs_info->scrub_pause_wait); | |
1222 | mutex_lock(&fs_info->scrub_lock); | |
1223 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
1224 | mutex_unlock(&fs_info->scrub_lock); | |
1225 | wait_event(fs_info->scrub_pause_wait, | |
1226 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
1227 | mutex_lock(&fs_info->scrub_lock); | |
1228 | } | |
1229 | atomic_dec(&fs_info->scrubs_paused); | |
1230 | mutex_unlock(&fs_info->scrub_lock); | |
1231 | wake_up(&fs_info->scrub_pause_wait); | |
1232 | scrub_free_csums(sdev); | |
1233 | start_stripe = i; | |
1234 | goto again; | |
1235 | } | |
1236 | ||
1237 | key.objectid = logical; | |
1238 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
1239 | key.offset = (u64)0; | |
1240 | ||
1241 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1242 | if (ret < 0) | |
1243 | goto out; | |
8c51032f | 1244 | if (ret > 0) { |
a2de733c AJ |
1245 | ret = btrfs_previous_item(root, path, 0, |
1246 | BTRFS_EXTENT_ITEM_KEY); | |
1247 | if (ret < 0) | |
1248 | goto out; | |
8c51032f AJ |
1249 | if (ret > 0) { |
1250 | /* there's no smaller item, so stick with the | |
1251 | * larger one */ | |
1252 | btrfs_release_path(path); | |
1253 | ret = btrfs_search_slot(NULL, root, &key, | |
1254 | path, 0, 0); | |
1255 | if (ret < 0) | |
1256 | goto out; | |
1257 | } | |
a2de733c AJ |
1258 | } |
1259 | ||
1260 | while (1) { | |
1261 | l = path->nodes[0]; | |
1262 | slot = path->slots[0]; | |
1263 | if (slot >= btrfs_header_nritems(l)) { | |
1264 | ret = btrfs_next_leaf(root, path); | |
1265 | if (ret == 0) | |
1266 | continue; | |
1267 | if (ret < 0) | |
1268 | goto out; | |
1269 | ||
1270 | break; | |
1271 | } | |
1272 | btrfs_item_key_to_cpu(l, &key, slot); | |
1273 | ||
1274 | if (key.objectid + key.offset <= logical) | |
1275 | goto next; | |
1276 | ||
1277 | if (key.objectid >= logical + map->stripe_len) | |
1278 | break; | |
1279 | ||
1280 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) | |
1281 | goto next; | |
1282 | ||
1283 | extent = btrfs_item_ptr(l, slot, | |
1284 | struct btrfs_extent_item); | |
1285 | flags = btrfs_extent_flags(l, extent); | |
1286 | generation = btrfs_extent_generation(l, extent); | |
1287 | ||
1288 | if (key.objectid < logical && | |
1289 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { | |
1290 | printk(KERN_ERR | |
1291 | "btrfs scrub: tree block %llu spanning " | |
1292 | "stripes, ignored. logical=%llu\n", | |
1293 | (unsigned long long)key.objectid, | |
1294 | (unsigned long long)logical); | |
1295 | goto next; | |
1296 | } | |
1297 | ||
1298 | /* | |
1299 | * trim extent to this stripe | |
1300 | */ | |
1301 | if (key.objectid < logical) { | |
1302 | key.offset -= logical - key.objectid; | |
1303 | key.objectid = logical; | |
1304 | } | |
1305 | if (key.objectid + key.offset > | |
1306 | logical + map->stripe_len) { | |
1307 | key.offset = logical + map->stripe_len - | |
1308 | key.objectid; | |
1309 | } | |
1310 | ||
1311 | ret = scrub_extent(sdev, key.objectid, key.offset, | |
1312 | key.objectid - logical + physical, | |
1313 | flags, generation, mirror_num); | |
1314 | if (ret) | |
1315 | goto out; | |
1316 | ||
1317 | next: | |
1318 | path->slots[0]++; | |
1319 | } | |
71267333 | 1320 | btrfs_release_path(path); |
a2de733c AJ |
1321 | logical += increment; |
1322 | physical += map->stripe_len; | |
1323 | spin_lock(&sdev->stat_lock); | |
1324 | sdev->stat.last_physical = physical; | |
1325 | spin_unlock(&sdev->stat_lock); | |
1326 | } | |
1327 | /* push queued extents */ | |
1328 | scrub_submit(sdev); | |
1329 | ||
1330 | out: | |
e7786c3a | 1331 | blk_finish_plug(&plug); |
8c51032f | 1332 | out_noplug: |
a2de733c AJ |
1333 | btrfs_free_path(path); |
1334 | return ret < 0 ? ret : 0; | |
1335 | } | |
1336 | ||
1337 | static noinline_for_stack int scrub_chunk(struct scrub_dev *sdev, | |
1338 | u64 chunk_tree, u64 chunk_objectid, u64 chunk_offset, u64 length) | |
1339 | { | |
1340 | struct btrfs_mapping_tree *map_tree = | |
1341 | &sdev->dev->dev_root->fs_info->mapping_tree; | |
1342 | struct map_lookup *map; | |
1343 | struct extent_map *em; | |
1344 | int i; | |
1345 | int ret = -EINVAL; | |
1346 | ||
1347 | read_lock(&map_tree->map_tree.lock); | |
1348 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | |
1349 | read_unlock(&map_tree->map_tree.lock); | |
1350 | ||
1351 | if (!em) | |
1352 | return -EINVAL; | |
1353 | ||
1354 | map = (struct map_lookup *)em->bdev; | |
1355 | if (em->start != chunk_offset) | |
1356 | goto out; | |
1357 | ||
1358 | if (em->len < length) | |
1359 | goto out; | |
1360 | ||
1361 | for (i = 0; i < map->num_stripes; ++i) { | |
1362 | if (map->stripes[i].dev == sdev->dev) { | |
1363 | ret = scrub_stripe(sdev, map, i, chunk_offset, length); | |
1364 | if (ret) | |
1365 | goto out; | |
1366 | } | |
1367 | } | |
1368 | out: | |
1369 | free_extent_map(em); | |
1370 | ||
1371 | return ret; | |
1372 | } | |
1373 | ||
1374 | static noinline_for_stack | |
1375 | int scrub_enumerate_chunks(struct scrub_dev *sdev, u64 start, u64 end) | |
1376 | { | |
1377 | struct btrfs_dev_extent *dev_extent = NULL; | |
1378 | struct btrfs_path *path; | |
1379 | struct btrfs_root *root = sdev->dev->dev_root; | |
1380 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1381 | u64 length; | |
1382 | u64 chunk_tree; | |
1383 | u64 chunk_objectid; | |
1384 | u64 chunk_offset; | |
1385 | int ret; | |
1386 | int slot; | |
1387 | struct extent_buffer *l; | |
1388 | struct btrfs_key key; | |
1389 | struct btrfs_key found_key; | |
1390 | struct btrfs_block_group_cache *cache; | |
1391 | ||
1392 | path = btrfs_alloc_path(); | |
1393 | if (!path) | |
1394 | return -ENOMEM; | |
1395 | ||
1396 | path->reada = 2; | |
1397 | path->search_commit_root = 1; | |
1398 | path->skip_locking = 1; | |
1399 | ||
1400 | key.objectid = sdev->dev->devid; | |
1401 | key.offset = 0ull; | |
1402 | key.type = BTRFS_DEV_EXTENT_KEY; | |
1403 | ||
1404 | ||
1405 | while (1) { | |
1406 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1407 | if (ret < 0) | |
8c51032f AJ |
1408 | break; |
1409 | if (ret > 0) { | |
1410 | if (path->slots[0] >= | |
1411 | btrfs_header_nritems(path->nodes[0])) { | |
1412 | ret = btrfs_next_leaf(root, path); | |
1413 | if (ret) | |
1414 | break; | |
1415 | } | |
1416 | } | |
a2de733c AJ |
1417 | |
1418 | l = path->nodes[0]; | |
1419 | slot = path->slots[0]; | |
1420 | ||
1421 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
1422 | ||
1423 | if (found_key.objectid != sdev->dev->devid) | |
1424 | break; | |
1425 | ||
8c51032f | 1426 | if (btrfs_key_type(&found_key) != BTRFS_DEV_EXTENT_KEY) |
a2de733c AJ |
1427 | break; |
1428 | ||
1429 | if (found_key.offset >= end) | |
1430 | break; | |
1431 | ||
1432 | if (found_key.offset < key.offset) | |
1433 | break; | |
1434 | ||
1435 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
1436 | length = btrfs_dev_extent_length(l, dev_extent); | |
1437 | ||
1438 | if (found_key.offset + length <= start) { | |
1439 | key.offset = found_key.offset + length; | |
71267333 | 1440 | btrfs_release_path(path); |
a2de733c AJ |
1441 | continue; |
1442 | } | |
1443 | ||
1444 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
1445 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
1446 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
1447 | ||
1448 | /* | |
1449 | * get a reference on the corresponding block group to prevent | |
1450 | * the chunk from going away while we scrub it | |
1451 | */ | |
1452 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
1453 | if (!cache) { | |
1454 | ret = -ENOENT; | |
8c51032f | 1455 | break; |
a2de733c AJ |
1456 | } |
1457 | ret = scrub_chunk(sdev, chunk_tree, chunk_objectid, | |
1458 | chunk_offset, length); | |
1459 | btrfs_put_block_group(cache); | |
1460 | if (ret) | |
1461 | break; | |
1462 | ||
1463 | key.offset = found_key.offset + length; | |
71267333 | 1464 | btrfs_release_path(path); |
a2de733c AJ |
1465 | } |
1466 | ||
a2de733c | 1467 | btrfs_free_path(path); |
8c51032f AJ |
1468 | |
1469 | /* | |
1470 | * ret can still be 1 from search_slot or next_leaf, | |
1471 | * that's not an error | |
1472 | */ | |
1473 | return ret < 0 ? ret : 0; | |
a2de733c AJ |
1474 | } |
1475 | ||
1476 | static noinline_for_stack int scrub_supers(struct scrub_dev *sdev) | |
1477 | { | |
1478 | int i; | |
1479 | u64 bytenr; | |
1480 | u64 gen; | |
1481 | int ret; | |
1482 | struct btrfs_device *device = sdev->dev; | |
1483 | struct btrfs_root *root = device->dev_root; | |
1484 | ||
1485 | gen = root->fs_info->last_trans_committed; | |
1486 | ||
1487 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
1488 | bytenr = btrfs_sb_offset(i); | |
1489 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) | |
1490 | break; | |
1491 | ||
1492 | ret = scrub_page(sdev, bytenr, PAGE_SIZE, bytenr, | |
1493 | BTRFS_EXTENT_FLAG_SUPER, gen, i, NULL, 1); | |
1494 | if (ret) | |
1495 | return ret; | |
1496 | } | |
1497 | wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0); | |
1498 | ||
1499 | return 0; | |
1500 | } | |
1501 | ||
1502 | /* | |
1503 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
1504 | */ | |
1505 | static noinline_for_stack int scrub_workers_get(struct btrfs_root *root) | |
1506 | { | |
1507 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1508 | ||
1509 | mutex_lock(&fs_info->scrub_lock); | |
632dd772 AJ |
1510 | if (fs_info->scrub_workers_refcnt == 0) { |
1511 | btrfs_init_workers(&fs_info->scrub_workers, "scrub", | |
1512 | fs_info->thread_pool_size, &fs_info->generic_worker); | |
1513 | fs_info->scrub_workers.idle_thresh = 4; | |
a2de733c | 1514 | btrfs_start_workers(&fs_info->scrub_workers, 1); |
632dd772 | 1515 | } |
a2de733c AJ |
1516 | ++fs_info->scrub_workers_refcnt; |
1517 | mutex_unlock(&fs_info->scrub_lock); | |
1518 | ||
1519 | return 0; | |
1520 | } | |
1521 | ||
1522 | static noinline_for_stack void scrub_workers_put(struct btrfs_root *root) | |
1523 | { | |
1524 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1525 | ||
1526 | mutex_lock(&fs_info->scrub_lock); | |
1527 | if (--fs_info->scrub_workers_refcnt == 0) | |
1528 | btrfs_stop_workers(&fs_info->scrub_workers); | |
1529 | WARN_ON(fs_info->scrub_workers_refcnt < 0); | |
1530 | mutex_unlock(&fs_info->scrub_lock); | |
1531 | } | |
1532 | ||
1533 | ||
1534 | int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end, | |
8628764e | 1535 | struct btrfs_scrub_progress *progress, int readonly) |
a2de733c AJ |
1536 | { |
1537 | struct scrub_dev *sdev; | |
1538 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1539 | int ret; | |
1540 | struct btrfs_device *dev; | |
1541 | ||
7841cb28 | 1542 | if (btrfs_fs_closing(root->fs_info)) |
a2de733c AJ |
1543 | return -EINVAL; |
1544 | ||
1545 | /* | |
1546 | * check some assumptions | |
1547 | */ | |
1548 | if (root->sectorsize != PAGE_SIZE || | |
1549 | root->sectorsize != root->leafsize || | |
1550 | root->sectorsize != root->nodesize) { | |
1551 | printk(KERN_ERR "btrfs_scrub: size assumptions fail\n"); | |
1552 | return -EINVAL; | |
1553 | } | |
1554 | ||
1555 | ret = scrub_workers_get(root); | |
1556 | if (ret) | |
1557 | return ret; | |
1558 | ||
1559 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1560 | dev = btrfs_find_device(root, devid, NULL, NULL); | |
1561 | if (!dev || dev->missing) { | |
1562 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
1563 | scrub_workers_put(root); | |
1564 | return -ENODEV; | |
1565 | } | |
1566 | mutex_lock(&fs_info->scrub_lock); | |
1567 | ||
1568 | if (!dev->in_fs_metadata) { | |
1569 | mutex_unlock(&fs_info->scrub_lock); | |
1570 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
1571 | scrub_workers_put(root); | |
1572 | return -ENODEV; | |
1573 | } | |
1574 | ||
1575 | if (dev->scrub_device) { | |
1576 | mutex_unlock(&fs_info->scrub_lock); | |
1577 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
1578 | scrub_workers_put(root); | |
1579 | return -EINPROGRESS; | |
1580 | } | |
1581 | sdev = scrub_setup_dev(dev); | |
1582 | if (IS_ERR(sdev)) { | |
1583 | mutex_unlock(&fs_info->scrub_lock); | |
1584 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
1585 | scrub_workers_put(root); | |
1586 | return PTR_ERR(sdev); | |
1587 | } | |
8628764e | 1588 | sdev->readonly = readonly; |
a2de733c AJ |
1589 | dev->scrub_device = sdev; |
1590 | ||
1591 | atomic_inc(&fs_info->scrubs_running); | |
1592 | mutex_unlock(&fs_info->scrub_lock); | |
1593 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
1594 | ||
1595 | down_read(&fs_info->scrub_super_lock); | |
1596 | ret = scrub_supers(sdev); | |
1597 | up_read(&fs_info->scrub_super_lock); | |
1598 | ||
1599 | if (!ret) | |
1600 | ret = scrub_enumerate_chunks(sdev, start, end); | |
1601 | ||
1602 | wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0); | |
a2de733c AJ |
1603 | atomic_dec(&fs_info->scrubs_running); |
1604 | wake_up(&fs_info->scrub_pause_wait); | |
1605 | ||
0ef8e451 JS |
1606 | wait_event(sdev->list_wait, atomic_read(&sdev->fixup_cnt) == 0); |
1607 | ||
a2de733c AJ |
1608 | if (progress) |
1609 | memcpy(progress, &sdev->stat, sizeof(*progress)); | |
1610 | ||
1611 | mutex_lock(&fs_info->scrub_lock); | |
1612 | dev->scrub_device = NULL; | |
1613 | mutex_unlock(&fs_info->scrub_lock); | |
1614 | ||
1615 | scrub_free_dev(sdev); | |
1616 | scrub_workers_put(root); | |
1617 | ||
1618 | return ret; | |
1619 | } | |
1620 | ||
1621 | int btrfs_scrub_pause(struct btrfs_root *root) | |
1622 | { | |
1623 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1624 | ||
1625 | mutex_lock(&fs_info->scrub_lock); | |
1626 | atomic_inc(&fs_info->scrub_pause_req); | |
1627 | while (atomic_read(&fs_info->scrubs_paused) != | |
1628 | atomic_read(&fs_info->scrubs_running)) { | |
1629 | mutex_unlock(&fs_info->scrub_lock); | |
1630 | wait_event(fs_info->scrub_pause_wait, | |
1631 | atomic_read(&fs_info->scrubs_paused) == | |
1632 | atomic_read(&fs_info->scrubs_running)); | |
1633 | mutex_lock(&fs_info->scrub_lock); | |
1634 | } | |
1635 | mutex_unlock(&fs_info->scrub_lock); | |
1636 | ||
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | int btrfs_scrub_continue(struct btrfs_root *root) | |
1641 | { | |
1642 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1643 | ||
1644 | atomic_dec(&fs_info->scrub_pause_req); | |
1645 | wake_up(&fs_info->scrub_pause_wait); | |
1646 | return 0; | |
1647 | } | |
1648 | ||
1649 | int btrfs_scrub_pause_super(struct btrfs_root *root) | |
1650 | { | |
1651 | down_write(&root->fs_info->scrub_super_lock); | |
1652 | return 0; | |
1653 | } | |
1654 | ||
1655 | int btrfs_scrub_continue_super(struct btrfs_root *root) | |
1656 | { | |
1657 | up_write(&root->fs_info->scrub_super_lock); | |
1658 | return 0; | |
1659 | } | |
1660 | ||
1661 | int btrfs_scrub_cancel(struct btrfs_root *root) | |
1662 | { | |
1663 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1664 | ||
1665 | mutex_lock(&fs_info->scrub_lock); | |
1666 | if (!atomic_read(&fs_info->scrubs_running)) { | |
1667 | mutex_unlock(&fs_info->scrub_lock); | |
1668 | return -ENOTCONN; | |
1669 | } | |
1670 | ||
1671 | atomic_inc(&fs_info->scrub_cancel_req); | |
1672 | while (atomic_read(&fs_info->scrubs_running)) { | |
1673 | mutex_unlock(&fs_info->scrub_lock); | |
1674 | wait_event(fs_info->scrub_pause_wait, | |
1675 | atomic_read(&fs_info->scrubs_running) == 0); | |
1676 | mutex_lock(&fs_info->scrub_lock); | |
1677 | } | |
1678 | atomic_dec(&fs_info->scrub_cancel_req); | |
1679 | mutex_unlock(&fs_info->scrub_lock); | |
1680 | ||
1681 | return 0; | |
1682 | } | |
1683 | ||
1684 | int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev) | |
1685 | { | |
1686 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1687 | struct scrub_dev *sdev; | |
1688 | ||
1689 | mutex_lock(&fs_info->scrub_lock); | |
1690 | sdev = dev->scrub_device; | |
1691 | if (!sdev) { | |
1692 | mutex_unlock(&fs_info->scrub_lock); | |
1693 | return -ENOTCONN; | |
1694 | } | |
1695 | atomic_inc(&sdev->cancel_req); | |
1696 | while (dev->scrub_device) { | |
1697 | mutex_unlock(&fs_info->scrub_lock); | |
1698 | wait_event(fs_info->scrub_pause_wait, | |
1699 | dev->scrub_device == NULL); | |
1700 | mutex_lock(&fs_info->scrub_lock); | |
1701 | } | |
1702 | mutex_unlock(&fs_info->scrub_lock); | |
1703 | ||
1704 | return 0; | |
1705 | } | |
1706 | int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid) | |
1707 | { | |
1708 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1709 | struct btrfs_device *dev; | |
1710 | int ret; | |
1711 | ||
1712 | /* | |
1713 | * we have to hold the device_list_mutex here so the device | |
1714 | * does not go away in cancel_dev. FIXME: find a better solution | |
1715 | */ | |
1716 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
1717 | dev = btrfs_find_device(root, devid, NULL, NULL); | |
1718 | if (!dev) { | |
1719 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
1720 | return -ENODEV; | |
1721 | } | |
1722 | ret = btrfs_scrub_cancel_dev(root, dev); | |
1723 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
1724 | ||
1725 | return ret; | |
1726 | } | |
1727 | ||
1728 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, | |
1729 | struct btrfs_scrub_progress *progress) | |
1730 | { | |
1731 | struct btrfs_device *dev; | |
1732 | struct scrub_dev *sdev = NULL; | |
1733 | ||
1734 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1735 | dev = btrfs_find_device(root, devid, NULL, NULL); | |
1736 | if (dev) | |
1737 | sdev = dev->scrub_device; | |
1738 | if (sdev) | |
1739 | memcpy(progress, &sdev->stat, sizeof(*progress)); | |
1740 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
1741 | ||
1742 | return dev ? (sdev ? 0 : -ENOTCONN) : -ENODEV; | |
1743 | } |