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1 | // SPDX-License-Identifier: GPL-2.0 | |
2 | /* | |
3 | * Copyright (C) 2011, 2012 STRATO. All rights reserved. | |
4 | */ | |
5 | ||
6 | #include <linux/blkdev.h> | |
7 | #include <linux/ratelimit.h> | |
8 | #include <linux/sched/mm.h> | |
9 | #include <crypto/hash.h> | |
10 | #include "ctree.h" | |
11 | #include "discard.h" | |
12 | #include "volumes.h" | |
13 | #include "disk-io.h" | |
14 | #include "ordered-data.h" | |
15 | #include "transaction.h" | |
16 | #include "backref.h" | |
17 | #include "extent_io.h" | |
18 | #include "dev-replace.h" | |
19 | #include "check-integrity.h" | |
20 | #include "rcu-string.h" | |
21 | #include "raid56.h" | |
22 | #include "block-group.h" | |
23 | #include "zoned.h" | |
24 | ||
25 | /* | |
26 | * This is only the first step towards a full-features scrub. It reads all | |
27 | * extent and super block and verifies the checksums. In case a bad checksum | |
28 | * is found or the extent cannot be read, good data will be written back if | |
29 | * any can be found. | |
30 | * | |
31 | * Future enhancements: | |
32 | * - In case an unrepairable extent is encountered, track which files are | |
33 | * affected and report them | |
34 | * - track and record media errors, throw out bad devices | |
35 | * - add a mode to also read unallocated space | |
36 | */ | |
37 | ||
38 | struct scrub_block; | |
39 | struct scrub_ctx; | |
40 | ||
41 | /* | |
42 | * the following three values only influence the performance. | |
43 | * The last one configures the number of parallel and outstanding I/O | |
44 | * operations. The first two values configure an upper limit for the number | |
45 | * of (dynamically allocated) pages that are added to a bio. | |
46 | */ | |
47 | #define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */ | |
48 | #define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */ | |
49 | #define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */ | |
50 | ||
51 | /* | |
52 | * the following value times PAGE_SIZE needs to be large enough to match the | |
53 | * largest node/leaf/sector size that shall be supported. | |
54 | * Values larger than BTRFS_STRIPE_LEN are not supported. | |
55 | */ | |
56 | #define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */ | |
57 | ||
58 | struct scrub_recover { | |
59 | refcount_t refs; | |
60 | struct btrfs_bio *bbio; | |
61 | u64 map_length; | |
62 | }; | |
63 | ||
64 | struct scrub_page { | |
65 | struct scrub_block *sblock; | |
66 | struct page *page; | |
67 | struct btrfs_device *dev; | |
68 | struct list_head list; | |
69 | u64 flags; /* extent flags */ | |
70 | u64 generation; | |
71 | u64 logical; | |
72 | u64 physical; | |
73 | u64 physical_for_dev_replace; | |
74 | atomic_t refs; | |
75 | u8 mirror_num; | |
76 | unsigned int have_csum:1; | |
77 | unsigned int io_error:1; | |
78 | u8 csum[BTRFS_CSUM_SIZE]; | |
79 | ||
80 | struct scrub_recover *recover; | |
81 | }; | |
82 | ||
83 | struct scrub_bio { | |
84 | int index; | |
85 | struct scrub_ctx *sctx; | |
86 | struct btrfs_device *dev; | |
87 | struct bio *bio; | |
88 | blk_status_t status; | |
89 | u64 logical; | |
90 | u64 physical; | |
91 | #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO | |
92 | struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO]; | |
93 | #else | |
94 | struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO]; | |
95 | #endif | |
96 | int page_count; | |
97 | int next_free; | |
98 | struct btrfs_work work; | |
99 | }; | |
100 | ||
101 | struct scrub_block { | |
102 | struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK]; | |
103 | int page_count; | |
104 | atomic_t outstanding_pages; | |
105 | refcount_t refs; /* free mem on transition to zero */ | |
106 | struct scrub_ctx *sctx; | |
107 | struct scrub_parity *sparity; | |
108 | struct { | |
109 | unsigned int header_error:1; | |
110 | unsigned int checksum_error:1; | |
111 | unsigned int no_io_error_seen:1; | |
112 | unsigned int generation_error:1; /* also sets header_error */ | |
113 | ||
114 | /* The following is for the data used to check parity */ | |
115 | /* It is for the data with checksum */ | |
116 | unsigned int data_corrected:1; | |
117 | }; | |
118 | struct btrfs_work work; | |
119 | }; | |
120 | ||
121 | /* Used for the chunks with parity stripe such RAID5/6 */ | |
122 | struct scrub_parity { | |
123 | struct scrub_ctx *sctx; | |
124 | ||
125 | struct btrfs_device *scrub_dev; | |
126 | ||
127 | u64 logic_start; | |
128 | ||
129 | u64 logic_end; | |
130 | ||
131 | int nsectors; | |
132 | ||
133 | u32 stripe_len; | |
134 | ||
135 | refcount_t refs; | |
136 | ||
137 | struct list_head spages; | |
138 | ||
139 | /* Work of parity check and repair */ | |
140 | struct btrfs_work work; | |
141 | ||
142 | /* Mark the parity blocks which have data */ | |
143 | unsigned long *dbitmap; | |
144 | ||
145 | /* | |
146 | * Mark the parity blocks which have data, but errors happen when | |
147 | * read data or check data | |
148 | */ | |
149 | unsigned long *ebitmap; | |
150 | ||
151 | unsigned long bitmap[]; | |
152 | }; | |
153 | ||
154 | struct scrub_ctx { | |
155 | struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX]; | |
156 | struct btrfs_fs_info *fs_info; | |
157 | int first_free; | |
158 | int curr; | |
159 | atomic_t bios_in_flight; | |
160 | atomic_t workers_pending; | |
161 | spinlock_t list_lock; | |
162 | wait_queue_head_t list_wait; | |
163 | struct list_head csum_list; | |
164 | atomic_t cancel_req; | |
165 | int readonly; | |
166 | int pages_per_rd_bio; | |
167 | ||
168 | /* State of IO submission throttling affecting the associated device */ | |
169 | ktime_t throttle_deadline; | |
170 | u64 throttle_sent; | |
171 | ||
172 | int is_dev_replace; | |
173 | u64 write_pointer; | |
174 | ||
175 | struct scrub_bio *wr_curr_bio; | |
176 | struct mutex wr_lock; | |
177 | int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */ | |
178 | struct btrfs_device *wr_tgtdev; | |
179 | bool flush_all_writes; | |
180 | ||
181 | /* | |
182 | * statistics | |
183 | */ | |
184 | struct btrfs_scrub_progress stat; | |
185 | spinlock_t stat_lock; | |
186 | ||
187 | /* | |
188 | * Use a ref counter to avoid use-after-free issues. Scrub workers | |
189 | * decrement bios_in_flight and workers_pending and then do a wakeup | |
190 | * on the list_wait wait queue. We must ensure the main scrub task | |
191 | * doesn't free the scrub context before or while the workers are | |
192 | * doing the wakeup() call. | |
193 | */ | |
194 | refcount_t refs; | |
195 | }; | |
196 | ||
197 | struct scrub_warning { | |
198 | struct btrfs_path *path; | |
199 | u64 extent_item_size; | |
200 | const char *errstr; | |
201 | u64 physical; | |
202 | u64 logical; | |
203 | struct btrfs_device *dev; | |
204 | }; | |
205 | ||
206 | struct full_stripe_lock { | |
207 | struct rb_node node; | |
208 | u64 logical; | |
209 | u64 refs; | |
210 | struct mutex mutex; | |
211 | }; | |
212 | ||
213 | static int scrub_setup_recheck_block(struct scrub_block *original_sblock, | |
214 | struct scrub_block *sblocks_for_recheck); | |
215 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, | |
216 | struct scrub_block *sblock, | |
217 | int retry_failed_mirror); | |
218 | static void scrub_recheck_block_checksum(struct scrub_block *sblock); | |
219 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, | |
220 | struct scrub_block *sblock_good); | |
221 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
222 | struct scrub_block *sblock_good, | |
223 | int page_num, int force_write); | |
224 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock); | |
225 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
226 | int page_num); | |
227 | static int scrub_checksum_data(struct scrub_block *sblock); | |
228 | static int scrub_checksum_tree_block(struct scrub_block *sblock); | |
229 | static int scrub_checksum_super(struct scrub_block *sblock); | |
230 | static void scrub_block_put(struct scrub_block *sblock); | |
231 | static void scrub_page_get(struct scrub_page *spage); | |
232 | static void scrub_page_put(struct scrub_page *spage); | |
233 | static void scrub_parity_get(struct scrub_parity *sparity); | |
234 | static void scrub_parity_put(struct scrub_parity *sparity); | |
235 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u32 len, | |
236 | u64 physical, struct btrfs_device *dev, u64 flags, | |
237 | u64 gen, int mirror_num, u8 *csum, | |
238 | u64 physical_for_dev_replace); | |
239 | static void scrub_bio_end_io(struct bio *bio); | |
240 | static void scrub_bio_end_io_worker(struct btrfs_work *work); | |
241 | static void scrub_block_complete(struct scrub_block *sblock); | |
242 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
243 | u64 extent_logical, u32 extent_len, | |
244 | u64 *extent_physical, | |
245 | struct btrfs_device **extent_dev, | |
246 | int *extent_mirror_num); | |
247 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
248 | struct scrub_page *spage); | |
249 | static void scrub_wr_submit(struct scrub_ctx *sctx); | |
250 | static void scrub_wr_bio_end_io(struct bio *bio); | |
251 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work); | |
252 | static void scrub_put_ctx(struct scrub_ctx *sctx); | |
253 | ||
254 | static inline int scrub_is_page_on_raid56(struct scrub_page *spage) | |
255 | { | |
256 | return spage->recover && | |
257 | (spage->recover->bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK); | |
258 | } | |
259 | ||
260 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx) | |
261 | { | |
262 | refcount_inc(&sctx->refs); | |
263 | atomic_inc(&sctx->bios_in_flight); | |
264 | } | |
265 | ||
266 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx) | |
267 | { | |
268 | atomic_dec(&sctx->bios_in_flight); | |
269 | wake_up(&sctx->list_wait); | |
270 | scrub_put_ctx(sctx); | |
271 | } | |
272 | ||
273 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) | |
274 | { | |
275 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
276 | mutex_unlock(&fs_info->scrub_lock); | |
277 | wait_event(fs_info->scrub_pause_wait, | |
278 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
279 | mutex_lock(&fs_info->scrub_lock); | |
280 | } | |
281 | } | |
282 | ||
283 | static void scrub_pause_on(struct btrfs_fs_info *fs_info) | |
284 | { | |
285 | atomic_inc(&fs_info->scrubs_paused); | |
286 | wake_up(&fs_info->scrub_pause_wait); | |
287 | } | |
288 | ||
289 | static void scrub_pause_off(struct btrfs_fs_info *fs_info) | |
290 | { | |
291 | mutex_lock(&fs_info->scrub_lock); | |
292 | __scrub_blocked_if_needed(fs_info); | |
293 | atomic_dec(&fs_info->scrubs_paused); | |
294 | mutex_unlock(&fs_info->scrub_lock); | |
295 | ||
296 | wake_up(&fs_info->scrub_pause_wait); | |
297 | } | |
298 | ||
299 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) | |
300 | { | |
301 | scrub_pause_on(fs_info); | |
302 | scrub_pause_off(fs_info); | |
303 | } | |
304 | ||
305 | /* | |
306 | * Insert new full stripe lock into full stripe locks tree | |
307 | * | |
308 | * Return pointer to existing or newly inserted full_stripe_lock structure if | |
309 | * everything works well. | |
310 | * Return ERR_PTR(-ENOMEM) if we failed to allocate memory | |
311 | * | |
312 | * NOTE: caller must hold full_stripe_locks_root->lock before calling this | |
313 | * function | |
314 | */ | |
315 | static struct full_stripe_lock *insert_full_stripe_lock( | |
316 | struct btrfs_full_stripe_locks_tree *locks_root, | |
317 | u64 fstripe_logical) | |
318 | { | |
319 | struct rb_node **p; | |
320 | struct rb_node *parent = NULL; | |
321 | struct full_stripe_lock *entry; | |
322 | struct full_stripe_lock *ret; | |
323 | ||
324 | lockdep_assert_held(&locks_root->lock); | |
325 | ||
326 | p = &locks_root->root.rb_node; | |
327 | while (*p) { | |
328 | parent = *p; | |
329 | entry = rb_entry(parent, struct full_stripe_lock, node); | |
330 | if (fstripe_logical < entry->logical) { | |
331 | p = &(*p)->rb_left; | |
332 | } else if (fstripe_logical > entry->logical) { | |
333 | p = &(*p)->rb_right; | |
334 | } else { | |
335 | entry->refs++; | |
336 | return entry; | |
337 | } | |
338 | } | |
339 | ||
340 | /* | |
341 | * Insert new lock. | |
342 | */ | |
343 | ret = kmalloc(sizeof(*ret), GFP_KERNEL); | |
344 | if (!ret) | |
345 | return ERR_PTR(-ENOMEM); | |
346 | ret->logical = fstripe_logical; | |
347 | ret->refs = 1; | |
348 | mutex_init(&ret->mutex); | |
349 | ||
350 | rb_link_node(&ret->node, parent, p); | |
351 | rb_insert_color(&ret->node, &locks_root->root); | |
352 | return ret; | |
353 | } | |
354 | ||
355 | /* | |
356 | * Search for a full stripe lock of a block group | |
357 | * | |
358 | * Return pointer to existing full stripe lock if found | |
359 | * Return NULL if not found | |
360 | */ | |
361 | static struct full_stripe_lock *search_full_stripe_lock( | |
362 | struct btrfs_full_stripe_locks_tree *locks_root, | |
363 | u64 fstripe_logical) | |
364 | { | |
365 | struct rb_node *node; | |
366 | struct full_stripe_lock *entry; | |
367 | ||
368 | lockdep_assert_held(&locks_root->lock); | |
369 | ||
370 | node = locks_root->root.rb_node; | |
371 | while (node) { | |
372 | entry = rb_entry(node, struct full_stripe_lock, node); | |
373 | if (fstripe_logical < entry->logical) | |
374 | node = node->rb_left; | |
375 | else if (fstripe_logical > entry->logical) | |
376 | node = node->rb_right; | |
377 | else | |
378 | return entry; | |
379 | } | |
380 | return NULL; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Helper to get full stripe logical from a normal bytenr. | |
385 | * | |
386 | * Caller must ensure @cache is a RAID56 block group. | |
387 | */ | |
388 | static u64 get_full_stripe_logical(struct btrfs_block_group *cache, u64 bytenr) | |
389 | { | |
390 | u64 ret; | |
391 | ||
392 | /* | |
393 | * Due to chunk item size limit, full stripe length should not be | |
394 | * larger than U32_MAX. Just a sanity check here. | |
395 | */ | |
396 | WARN_ON_ONCE(cache->full_stripe_len >= U32_MAX); | |
397 | ||
398 | /* | |
399 | * round_down() can only handle power of 2, while RAID56 full | |
400 | * stripe length can be 64KiB * n, so we need to manually round down. | |
401 | */ | |
402 | ret = div64_u64(bytenr - cache->start, cache->full_stripe_len) * | |
403 | cache->full_stripe_len + cache->start; | |
404 | return ret; | |
405 | } | |
406 | ||
407 | /* | |
408 | * Lock a full stripe to avoid concurrency of recovery and read | |
409 | * | |
410 | * It's only used for profiles with parities (RAID5/6), for other profiles it | |
411 | * does nothing. | |
412 | * | |
413 | * Return 0 if we locked full stripe covering @bytenr, with a mutex held. | |
414 | * So caller must call unlock_full_stripe() at the same context. | |
415 | * | |
416 | * Return <0 if encounters error. | |
417 | */ | |
418 | static int lock_full_stripe(struct btrfs_fs_info *fs_info, u64 bytenr, | |
419 | bool *locked_ret) | |
420 | { | |
421 | struct btrfs_block_group *bg_cache; | |
422 | struct btrfs_full_stripe_locks_tree *locks_root; | |
423 | struct full_stripe_lock *existing; | |
424 | u64 fstripe_start; | |
425 | int ret = 0; | |
426 | ||
427 | *locked_ret = false; | |
428 | bg_cache = btrfs_lookup_block_group(fs_info, bytenr); | |
429 | if (!bg_cache) { | |
430 | ASSERT(0); | |
431 | return -ENOENT; | |
432 | } | |
433 | ||
434 | /* Profiles not based on parity don't need full stripe lock */ | |
435 | if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_RAID56_MASK)) | |
436 | goto out; | |
437 | locks_root = &bg_cache->full_stripe_locks_root; | |
438 | ||
439 | fstripe_start = get_full_stripe_logical(bg_cache, bytenr); | |
440 | ||
441 | /* Now insert the full stripe lock */ | |
442 | mutex_lock(&locks_root->lock); | |
443 | existing = insert_full_stripe_lock(locks_root, fstripe_start); | |
444 | mutex_unlock(&locks_root->lock); | |
445 | if (IS_ERR(existing)) { | |
446 | ret = PTR_ERR(existing); | |
447 | goto out; | |
448 | } | |
449 | mutex_lock(&existing->mutex); | |
450 | *locked_ret = true; | |
451 | out: | |
452 | btrfs_put_block_group(bg_cache); | |
453 | return ret; | |
454 | } | |
455 | ||
456 | /* | |
457 | * Unlock a full stripe. | |
458 | * | |
459 | * NOTE: Caller must ensure it's the same context calling corresponding | |
460 | * lock_full_stripe(). | |
461 | * | |
462 | * Return 0 if we unlock full stripe without problem. | |
463 | * Return <0 for error | |
464 | */ | |
465 | static int unlock_full_stripe(struct btrfs_fs_info *fs_info, u64 bytenr, | |
466 | bool locked) | |
467 | { | |
468 | struct btrfs_block_group *bg_cache; | |
469 | struct btrfs_full_stripe_locks_tree *locks_root; | |
470 | struct full_stripe_lock *fstripe_lock; | |
471 | u64 fstripe_start; | |
472 | bool freeit = false; | |
473 | int ret = 0; | |
474 | ||
475 | /* If we didn't acquire full stripe lock, no need to continue */ | |
476 | if (!locked) | |
477 | return 0; | |
478 | ||
479 | bg_cache = btrfs_lookup_block_group(fs_info, bytenr); | |
480 | if (!bg_cache) { | |
481 | ASSERT(0); | |
482 | return -ENOENT; | |
483 | } | |
484 | if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_RAID56_MASK)) | |
485 | goto out; | |
486 | ||
487 | locks_root = &bg_cache->full_stripe_locks_root; | |
488 | fstripe_start = get_full_stripe_logical(bg_cache, bytenr); | |
489 | ||
490 | mutex_lock(&locks_root->lock); | |
491 | fstripe_lock = search_full_stripe_lock(locks_root, fstripe_start); | |
492 | /* Unpaired unlock_full_stripe() detected */ | |
493 | if (!fstripe_lock) { | |
494 | WARN_ON(1); | |
495 | ret = -ENOENT; | |
496 | mutex_unlock(&locks_root->lock); | |
497 | goto out; | |
498 | } | |
499 | ||
500 | if (fstripe_lock->refs == 0) { | |
501 | WARN_ON(1); | |
502 | btrfs_warn(fs_info, "full stripe lock at %llu refcount underflow", | |
503 | fstripe_lock->logical); | |
504 | } else { | |
505 | fstripe_lock->refs--; | |
506 | } | |
507 | ||
508 | if (fstripe_lock->refs == 0) { | |
509 | rb_erase(&fstripe_lock->node, &locks_root->root); | |
510 | freeit = true; | |
511 | } | |
512 | mutex_unlock(&locks_root->lock); | |
513 | ||
514 | mutex_unlock(&fstripe_lock->mutex); | |
515 | if (freeit) | |
516 | kfree(fstripe_lock); | |
517 | out: | |
518 | btrfs_put_block_group(bg_cache); | |
519 | return ret; | |
520 | } | |
521 | ||
522 | static void scrub_free_csums(struct scrub_ctx *sctx) | |
523 | { | |
524 | while (!list_empty(&sctx->csum_list)) { | |
525 | struct btrfs_ordered_sum *sum; | |
526 | sum = list_first_entry(&sctx->csum_list, | |
527 | struct btrfs_ordered_sum, list); | |
528 | list_del(&sum->list); | |
529 | kfree(sum); | |
530 | } | |
531 | } | |
532 | ||
533 | static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) | |
534 | { | |
535 | int i; | |
536 | ||
537 | if (!sctx) | |
538 | return; | |
539 | ||
540 | /* this can happen when scrub is cancelled */ | |
541 | if (sctx->curr != -1) { | |
542 | struct scrub_bio *sbio = sctx->bios[sctx->curr]; | |
543 | ||
544 | for (i = 0; i < sbio->page_count; i++) { | |
545 | WARN_ON(!sbio->pagev[i]->page); | |
546 | scrub_block_put(sbio->pagev[i]->sblock); | |
547 | } | |
548 | bio_put(sbio->bio); | |
549 | } | |
550 | ||
551 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { | |
552 | struct scrub_bio *sbio = sctx->bios[i]; | |
553 | ||
554 | if (!sbio) | |
555 | break; | |
556 | kfree(sbio); | |
557 | } | |
558 | ||
559 | kfree(sctx->wr_curr_bio); | |
560 | scrub_free_csums(sctx); | |
561 | kfree(sctx); | |
562 | } | |
563 | ||
564 | static void scrub_put_ctx(struct scrub_ctx *sctx) | |
565 | { | |
566 | if (refcount_dec_and_test(&sctx->refs)) | |
567 | scrub_free_ctx(sctx); | |
568 | } | |
569 | ||
570 | static noinline_for_stack struct scrub_ctx *scrub_setup_ctx( | |
571 | struct btrfs_fs_info *fs_info, int is_dev_replace) | |
572 | { | |
573 | struct scrub_ctx *sctx; | |
574 | int i; | |
575 | ||
576 | sctx = kzalloc(sizeof(*sctx), GFP_KERNEL); | |
577 | if (!sctx) | |
578 | goto nomem; | |
579 | refcount_set(&sctx->refs, 1); | |
580 | sctx->is_dev_replace = is_dev_replace; | |
581 | sctx->pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; | |
582 | sctx->curr = -1; | |
583 | sctx->fs_info = fs_info; | |
584 | INIT_LIST_HEAD(&sctx->csum_list); | |
585 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { | |
586 | struct scrub_bio *sbio; | |
587 | ||
588 | sbio = kzalloc(sizeof(*sbio), GFP_KERNEL); | |
589 | if (!sbio) | |
590 | goto nomem; | |
591 | sctx->bios[i] = sbio; | |
592 | ||
593 | sbio->index = i; | |
594 | sbio->sctx = sctx; | |
595 | sbio->page_count = 0; | |
596 | btrfs_init_work(&sbio->work, scrub_bio_end_io_worker, NULL, | |
597 | NULL); | |
598 | ||
599 | if (i != SCRUB_BIOS_PER_SCTX - 1) | |
600 | sctx->bios[i]->next_free = i + 1; | |
601 | else | |
602 | sctx->bios[i]->next_free = -1; | |
603 | } | |
604 | sctx->first_free = 0; | |
605 | atomic_set(&sctx->bios_in_flight, 0); | |
606 | atomic_set(&sctx->workers_pending, 0); | |
607 | atomic_set(&sctx->cancel_req, 0); | |
608 | ||
609 | spin_lock_init(&sctx->list_lock); | |
610 | spin_lock_init(&sctx->stat_lock); | |
611 | init_waitqueue_head(&sctx->list_wait); | |
612 | sctx->throttle_deadline = 0; | |
613 | ||
614 | WARN_ON(sctx->wr_curr_bio != NULL); | |
615 | mutex_init(&sctx->wr_lock); | |
616 | sctx->wr_curr_bio = NULL; | |
617 | if (is_dev_replace) { | |
618 | WARN_ON(!fs_info->dev_replace.tgtdev); | |
619 | sctx->pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO; | |
620 | sctx->wr_tgtdev = fs_info->dev_replace.tgtdev; | |
621 | sctx->flush_all_writes = false; | |
622 | } | |
623 | ||
624 | return sctx; | |
625 | ||
626 | nomem: | |
627 | scrub_free_ctx(sctx); | |
628 | return ERR_PTR(-ENOMEM); | |
629 | } | |
630 | ||
631 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, | |
632 | void *warn_ctx) | |
633 | { | |
634 | u32 nlink; | |
635 | int ret; | |
636 | int i; | |
637 | unsigned nofs_flag; | |
638 | struct extent_buffer *eb; | |
639 | struct btrfs_inode_item *inode_item; | |
640 | struct scrub_warning *swarn = warn_ctx; | |
641 | struct btrfs_fs_info *fs_info = swarn->dev->fs_info; | |
642 | struct inode_fs_paths *ipath = NULL; | |
643 | struct btrfs_root *local_root; | |
644 | struct btrfs_key key; | |
645 | ||
646 | local_root = btrfs_get_fs_root(fs_info, root, true); | |
647 | if (IS_ERR(local_root)) { | |
648 | ret = PTR_ERR(local_root); | |
649 | goto err; | |
650 | } | |
651 | ||
652 | /* | |
653 | * this makes the path point to (inum INODE_ITEM ioff) | |
654 | */ | |
655 | key.objectid = inum; | |
656 | key.type = BTRFS_INODE_ITEM_KEY; | |
657 | key.offset = 0; | |
658 | ||
659 | ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0); | |
660 | if (ret) { | |
661 | btrfs_put_root(local_root); | |
662 | btrfs_release_path(swarn->path); | |
663 | goto err; | |
664 | } | |
665 | ||
666 | eb = swarn->path->nodes[0]; | |
667 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], | |
668 | struct btrfs_inode_item); | |
669 | nlink = btrfs_inode_nlink(eb, inode_item); | |
670 | btrfs_release_path(swarn->path); | |
671 | ||
672 | /* | |
673 | * init_path might indirectly call vmalloc, or use GFP_KERNEL. Scrub | |
674 | * uses GFP_NOFS in this context, so we keep it consistent but it does | |
675 | * not seem to be strictly necessary. | |
676 | */ | |
677 | nofs_flag = memalloc_nofs_save(); | |
678 | ipath = init_ipath(4096, local_root, swarn->path); | |
679 | memalloc_nofs_restore(nofs_flag); | |
680 | if (IS_ERR(ipath)) { | |
681 | btrfs_put_root(local_root); | |
682 | ret = PTR_ERR(ipath); | |
683 | ipath = NULL; | |
684 | goto err; | |
685 | } | |
686 | ret = paths_from_inode(inum, ipath); | |
687 | ||
688 | if (ret < 0) | |
689 | goto err; | |
690 | ||
691 | /* | |
692 | * we deliberately ignore the bit ipath might have been too small to | |
693 | * hold all of the paths here | |
694 | */ | |
695 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) | |
696 | btrfs_warn_in_rcu(fs_info, | |
697 | "%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu, length %u, links %u (path: %s)", | |
698 | swarn->errstr, swarn->logical, | |
699 | rcu_str_deref(swarn->dev->name), | |
700 | swarn->physical, | |
701 | root, inum, offset, | |
702 | fs_info->sectorsize, nlink, | |
703 | (char *)(unsigned long)ipath->fspath->val[i]); | |
704 | ||
705 | btrfs_put_root(local_root); | |
706 | free_ipath(ipath); | |
707 | return 0; | |
708 | ||
709 | err: | |
710 | btrfs_warn_in_rcu(fs_info, | |
711 | "%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu: path resolving failed with ret=%d", | |
712 | swarn->errstr, swarn->logical, | |
713 | rcu_str_deref(swarn->dev->name), | |
714 | swarn->physical, | |
715 | root, inum, offset, ret); | |
716 | ||
717 | free_ipath(ipath); | |
718 | return 0; | |
719 | } | |
720 | ||
721 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) | |
722 | { | |
723 | struct btrfs_device *dev; | |
724 | struct btrfs_fs_info *fs_info; | |
725 | struct btrfs_path *path; | |
726 | struct btrfs_key found_key; | |
727 | struct extent_buffer *eb; | |
728 | struct btrfs_extent_item *ei; | |
729 | struct scrub_warning swarn; | |
730 | unsigned long ptr = 0; | |
731 | u64 extent_item_pos; | |
732 | u64 flags = 0; | |
733 | u64 ref_root; | |
734 | u32 item_size; | |
735 | u8 ref_level = 0; | |
736 | int ret; | |
737 | ||
738 | WARN_ON(sblock->page_count < 1); | |
739 | dev = sblock->pagev[0]->dev; | |
740 | fs_info = sblock->sctx->fs_info; | |
741 | ||
742 | path = btrfs_alloc_path(); | |
743 | if (!path) | |
744 | return; | |
745 | ||
746 | swarn.physical = sblock->pagev[0]->physical; | |
747 | swarn.logical = sblock->pagev[0]->logical; | |
748 | swarn.errstr = errstr; | |
749 | swarn.dev = NULL; | |
750 | ||
751 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, | |
752 | &flags); | |
753 | if (ret < 0) | |
754 | goto out; | |
755 | ||
756 | extent_item_pos = swarn.logical - found_key.objectid; | |
757 | swarn.extent_item_size = found_key.offset; | |
758 | ||
759 | eb = path->nodes[0]; | |
760 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); | |
761 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
762 | ||
763 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
764 | do { | |
765 | ret = tree_backref_for_extent(&ptr, eb, &found_key, ei, | |
766 | item_size, &ref_root, | |
767 | &ref_level); | |
768 | btrfs_warn_in_rcu(fs_info, | |
769 | "%s at logical %llu on dev %s, physical %llu: metadata %s (level %d) in tree %llu", | |
770 | errstr, swarn.logical, | |
771 | rcu_str_deref(dev->name), | |
772 | swarn.physical, | |
773 | ref_level ? "node" : "leaf", | |
774 | ret < 0 ? -1 : ref_level, | |
775 | ret < 0 ? -1 : ref_root); | |
776 | } while (ret != 1); | |
777 | btrfs_release_path(path); | |
778 | } else { | |
779 | btrfs_release_path(path); | |
780 | swarn.path = path; | |
781 | swarn.dev = dev; | |
782 | iterate_extent_inodes(fs_info, found_key.objectid, | |
783 | extent_item_pos, 1, | |
784 | scrub_print_warning_inode, &swarn, false); | |
785 | } | |
786 | ||
787 | out: | |
788 | btrfs_free_path(path); | |
789 | } | |
790 | ||
791 | static inline void scrub_get_recover(struct scrub_recover *recover) | |
792 | { | |
793 | refcount_inc(&recover->refs); | |
794 | } | |
795 | ||
796 | static inline void scrub_put_recover(struct btrfs_fs_info *fs_info, | |
797 | struct scrub_recover *recover) | |
798 | { | |
799 | if (refcount_dec_and_test(&recover->refs)) { | |
800 | btrfs_bio_counter_dec(fs_info); | |
801 | btrfs_put_bbio(recover->bbio); | |
802 | kfree(recover); | |
803 | } | |
804 | } | |
805 | ||
806 | /* | |
807 | * scrub_handle_errored_block gets called when either verification of the | |
808 | * pages failed or the bio failed to read, e.g. with EIO. In the latter | |
809 | * case, this function handles all pages in the bio, even though only one | |
810 | * may be bad. | |
811 | * The goal of this function is to repair the errored block by using the | |
812 | * contents of one of the mirrors. | |
813 | */ | |
814 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) | |
815 | { | |
816 | struct scrub_ctx *sctx = sblock_to_check->sctx; | |
817 | struct btrfs_device *dev; | |
818 | struct btrfs_fs_info *fs_info; | |
819 | u64 logical; | |
820 | unsigned int failed_mirror_index; | |
821 | unsigned int is_metadata; | |
822 | unsigned int have_csum; | |
823 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ | |
824 | struct scrub_block *sblock_bad; | |
825 | int ret; | |
826 | int mirror_index; | |
827 | int page_num; | |
828 | int success; | |
829 | bool full_stripe_locked; | |
830 | unsigned int nofs_flag; | |
831 | static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, | |
832 | DEFAULT_RATELIMIT_BURST); | |
833 | ||
834 | BUG_ON(sblock_to_check->page_count < 1); | |
835 | fs_info = sctx->fs_info; | |
836 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { | |
837 | /* | |
838 | * if we find an error in a super block, we just report it. | |
839 | * They will get written with the next transaction commit | |
840 | * anyway | |
841 | */ | |
842 | spin_lock(&sctx->stat_lock); | |
843 | ++sctx->stat.super_errors; | |
844 | spin_unlock(&sctx->stat_lock); | |
845 | return 0; | |
846 | } | |
847 | logical = sblock_to_check->pagev[0]->logical; | |
848 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); | |
849 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; | |
850 | is_metadata = !(sblock_to_check->pagev[0]->flags & | |
851 | BTRFS_EXTENT_FLAG_DATA); | |
852 | have_csum = sblock_to_check->pagev[0]->have_csum; | |
853 | dev = sblock_to_check->pagev[0]->dev; | |
854 | ||
855 | if (btrfs_is_zoned(fs_info) && !sctx->is_dev_replace) | |
856 | return btrfs_repair_one_zone(fs_info, logical); | |
857 | ||
858 | /* | |
859 | * We must use GFP_NOFS because the scrub task might be waiting for a | |
860 | * worker task executing this function and in turn a transaction commit | |
861 | * might be waiting the scrub task to pause (which needs to wait for all | |
862 | * the worker tasks to complete before pausing). | |
863 | * We do allocations in the workers through insert_full_stripe_lock() | |
864 | * and scrub_add_page_to_wr_bio(), which happens down the call chain of | |
865 | * this function. | |
866 | */ | |
867 | nofs_flag = memalloc_nofs_save(); | |
868 | /* | |
869 | * For RAID5/6, race can happen for a different device scrub thread. | |
870 | * For data corruption, Parity and Data threads will both try | |
871 | * to recovery the data. | |
872 | * Race can lead to doubly added csum error, or even unrecoverable | |
873 | * error. | |
874 | */ | |
875 | ret = lock_full_stripe(fs_info, logical, &full_stripe_locked); | |
876 | if (ret < 0) { | |
877 | memalloc_nofs_restore(nofs_flag); | |
878 | spin_lock(&sctx->stat_lock); | |
879 | if (ret == -ENOMEM) | |
880 | sctx->stat.malloc_errors++; | |
881 | sctx->stat.read_errors++; | |
882 | sctx->stat.uncorrectable_errors++; | |
883 | spin_unlock(&sctx->stat_lock); | |
884 | return ret; | |
885 | } | |
886 | ||
887 | /* | |
888 | * read all mirrors one after the other. This includes to | |
889 | * re-read the extent or metadata block that failed (that was | |
890 | * the cause that this fixup code is called) another time, | |
891 | * sector by sector this time in order to know which sectors | |
892 | * caused I/O errors and which ones are good (for all mirrors). | |
893 | * It is the goal to handle the situation when more than one | |
894 | * mirror contains I/O errors, but the errors do not | |
895 | * overlap, i.e. the data can be repaired by selecting the | |
896 | * sectors from those mirrors without I/O error on the | |
897 | * particular sectors. One example (with blocks >= 2 * sectorsize) | |
898 | * would be that mirror #1 has an I/O error on the first sector, | |
899 | * the second sector is good, and mirror #2 has an I/O error on | |
900 | * the second sector, but the first sector is good. | |
901 | * Then the first sector of the first mirror can be repaired by | |
902 | * taking the first sector of the second mirror, and the | |
903 | * second sector of the second mirror can be repaired by | |
904 | * copying the contents of the 2nd sector of the 1st mirror. | |
905 | * One more note: if the sectors of one mirror contain I/O | |
906 | * errors, the checksum cannot be verified. In order to get | |
907 | * the best data for repairing, the first attempt is to find | |
908 | * a mirror without I/O errors and with a validated checksum. | |
909 | * Only if this is not possible, the sectors are picked from | |
910 | * mirrors with I/O errors without considering the checksum. | |
911 | * If the latter is the case, at the end, the checksum of the | |
912 | * repaired area is verified in order to correctly maintain | |
913 | * the statistics. | |
914 | */ | |
915 | ||
916 | sblocks_for_recheck = kcalloc(BTRFS_MAX_MIRRORS, | |
917 | sizeof(*sblocks_for_recheck), GFP_KERNEL); | |
918 | if (!sblocks_for_recheck) { | |
919 | spin_lock(&sctx->stat_lock); | |
920 | sctx->stat.malloc_errors++; | |
921 | sctx->stat.read_errors++; | |
922 | sctx->stat.uncorrectable_errors++; | |
923 | spin_unlock(&sctx->stat_lock); | |
924 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); | |
925 | goto out; | |
926 | } | |
927 | ||
928 | /* setup the context, map the logical blocks and alloc the pages */ | |
929 | ret = scrub_setup_recheck_block(sblock_to_check, sblocks_for_recheck); | |
930 | if (ret) { | |
931 | spin_lock(&sctx->stat_lock); | |
932 | sctx->stat.read_errors++; | |
933 | sctx->stat.uncorrectable_errors++; | |
934 | spin_unlock(&sctx->stat_lock); | |
935 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); | |
936 | goto out; | |
937 | } | |
938 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); | |
939 | sblock_bad = sblocks_for_recheck + failed_mirror_index; | |
940 | ||
941 | /* build and submit the bios for the failed mirror, check checksums */ | |
942 | scrub_recheck_block(fs_info, sblock_bad, 1); | |
943 | ||
944 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && | |
945 | sblock_bad->no_io_error_seen) { | |
946 | /* | |
947 | * the error disappeared after reading page by page, or | |
948 | * the area was part of a huge bio and other parts of the | |
949 | * bio caused I/O errors, or the block layer merged several | |
950 | * read requests into one and the error is caused by a | |
951 | * different bio (usually one of the two latter cases is | |
952 | * the cause) | |
953 | */ | |
954 | spin_lock(&sctx->stat_lock); | |
955 | sctx->stat.unverified_errors++; | |
956 | sblock_to_check->data_corrected = 1; | |
957 | spin_unlock(&sctx->stat_lock); | |
958 | ||
959 | if (sctx->is_dev_replace) | |
960 | scrub_write_block_to_dev_replace(sblock_bad); | |
961 | goto out; | |
962 | } | |
963 | ||
964 | if (!sblock_bad->no_io_error_seen) { | |
965 | spin_lock(&sctx->stat_lock); | |
966 | sctx->stat.read_errors++; | |
967 | spin_unlock(&sctx->stat_lock); | |
968 | if (__ratelimit(&rs)) | |
969 | scrub_print_warning("i/o error", sblock_to_check); | |
970 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); | |
971 | } else if (sblock_bad->checksum_error) { | |
972 | spin_lock(&sctx->stat_lock); | |
973 | sctx->stat.csum_errors++; | |
974 | spin_unlock(&sctx->stat_lock); | |
975 | if (__ratelimit(&rs)) | |
976 | scrub_print_warning("checksum error", sblock_to_check); | |
977 | btrfs_dev_stat_inc_and_print(dev, | |
978 | BTRFS_DEV_STAT_CORRUPTION_ERRS); | |
979 | } else if (sblock_bad->header_error) { | |
980 | spin_lock(&sctx->stat_lock); | |
981 | sctx->stat.verify_errors++; | |
982 | spin_unlock(&sctx->stat_lock); | |
983 | if (__ratelimit(&rs)) | |
984 | scrub_print_warning("checksum/header error", | |
985 | sblock_to_check); | |
986 | if (sblock_bad->generation_error) | |
987 | btrfs_dev_stat_inc_and_print(dev, | |
988 | BTRFS_DEV_STAT_GENERATION_ERRS); | |
989 | else | |
990 | btrfs_dev_stat_inc_and_print(dev, | |
991 | BTRFS_DEV_STAT_CORRUPTION_ERRS); | |
992 | } | |
993 | ||
994 | if (sctx->readonly) { | |
995 | ASSERT(!sctx->is_dev_replace); | |
996 | goto out; | |
997 | } | |
998 | ||
999 | /* | |
1000 | * now build and submit the bios for the other mirrors, check | |
1001 | * checksums. | |
1002 | * First try to pick the mirror which is completely without I/O | |
1003 | * errors and also does not have a checksum error. | |
1004 | * If one is found, and if a checksum is present, the full block | |
1005 | * that is known to contain an error is rewritten. Afterwards | |
1006 | * the block is known to be corrected. | |
1007 | * If a mirror is found which is completely correct, and no | |
1008 | * checksum is present, only those pages are rewritten that had | |
1009 | * an I/O error in the block to be repaired, since it cannot be | |
1010 | * determined, which copy of the other pages is better (and it | |
1011 | * could happen otherwise that a correct page would be | |
1012 | * overwritten by a bad one). | |
1013 | */ | |
1014 | for (mirror_index = 0; ;mirror_index++) { | |
1015 | struct scrub_block *sblock_other; | |
1016 | ||
1017 | if (mirror_index == failed_mirror_index) | |
1018 | continue; | |
1019 | ||
1020 | /* raid56's mirror can be more than BTRFS_MAX_MIRRORS */ | |
1021 | if (!scrub_is_page_on_raid56(sblock_bad->pagev[0])) { | |
1022 | if (mirror_index >= BTRFS_MAX_MIRRORS) | |
1023 | break; | |
1024 | if (!sblocks_for_recheck[mirror_index].page_count) | |
1025 | break; | |
1026 | ||
1027 | sblock_other = sblocks_for_recheck + mirror_index; | |
1028 | } else { | |
1029 | struct scrub_recover *r = sblock_bad->pagev[0]->recover; | |
1030 | int max_allowed = r->bbio->num_stripes - | |
1031 | r->bbio->num_tgtdevs; | |
1032 | ||
1033 | if (mirror_index >= max_allowed) | |
1034 | break; | |
1035 | if (!sblocks_for_recheck[1].page_count) | |
1036 | break; | |
1037 | ||
1038 | ASSERT(failed_mirror_index == 0); | |
1039 | sblock_other = sblocks_for_recheck + 1; | |
1040 | sblock_other->pagev[0]->mirror_num = 1 + mirror_index; | |
1041 | } | |
1042 | ||
1043 | /* build and submit the bios, check checksums */ | |
1044 | scrub_recheck_block(fs_info, sblock_other, 0); | |
1045 | ||
1046 | if (!sblock_other->header_error && | |
1047 | !sblock_other->checksum_error && | |
1048 | sblock_other->no_io_error_seen) { | |
1049 | if (sctx->is_dev_replace) { | |
1050 | scrub_write_block_to_dev_replace(sblock_other); | |
1051 | goto corrected_error; | |
1052 | } else { | |
1053 | ret = scrub_repair_block_from_good_copy( | |
1054 | sblock_bad, sblock_other); | |
1055 | if (!ret) | |
1056 | goto corrected_error; | |
1057 | } | |
1058 | } | |
1059 | } | |
1060 | ||
1061 | if (sblock_bad->no_io_error_seen && !sctx->is_dev_replace) | |
1062 | goto did_not_correct_error; | |
1063 | ||
1064 | /* | |
1065 | * In case of I/O errors in the area that is supposed to be | |
1066 | * repaired, continue by picking good copies of those sectors. | |
1067 | * Select the good sectors from mirrors to rewrite bad sectors from | |
1068 | * the area to fix. Afterwards verify the checksum of the block | |
1069 | * that is supposed to be repaired. This verification step is | |
1070 | * only done for the purpose of statistic counting and for the | |
1071 | * final scrub report, whether errors remain. | |
1072 | * A perfect algorithm could make use of the checksum and try | |
1073 | * all possible combinations of sectors from the different mirrors | |
1074 | * until the checksum verification succeeds. For example, when | |
1075 | * the 2nd sector of mirror #1 faces I/O errors, and the 2nd sector | |
1076 | * of mirror #2 is readable but the final checksum test fails, | |
1077 | * then the 2nd sector of mirror #3 could be tried, whether now | |
1078 | * the final checksum succeeds. But this would be a rare | |
1079 | * exception and is therefore not implemented. At least it is | |
1080 | * avoided that the good copy is overwritten. | |
1081 | * A more useful improvement would be to pick the sectors | |
1082 | * without I/O error based on sector sizes (512 bytes on legacy | |
1083 | * disks) instead of on sectorsize. Then maybe 512 byte of one | |
1084 | * mirror could be repaired by taking 512 byte of a different | |
1085 | * mirror, even if other 512 byte sectors in the same sectorsize | |
1086 | * area are unreadable. | |
1087 | */ | |
1088 | success = 1; | |
1089 | for (page_num = 0; page_num < sblock_bad->page_count; | |
1090 | page_num++) { | |
1091 | struct scrub_page *spage_bad = sblock_bad->pagev[page_num]; | |
1092 | struct scrub_block *sblock_other = NULL; | |
1093 | ||
1094 | /* skip no-io-error page in scrub */ | |
1095 | if (!spage_bad->io_error && !sctx->is_dev_replace) | |
1096 | continue; | |
1097 | ||
1098 | if (scrub_is_page_on_raid56(sblock_bad->pagev[0])) { | |
1099 | /* | |
1100 | * In case of dev replace, if raid56 rebuild process | |
1101 | * didn't work out correct data, then copy the content | |
1102 | * in sblock_bad to make sure target device is identical | |
1103 | * to source device, instead of writing garbage data in | |
1104 | * sblock_for_recheck array to target device. | |
1105 | */ | |
1106 | sblock_other = NULL; | |
1107 | } else if (spage_bad->io_error) { | |
1108 | /* try to find no-io-error page in mirrors */ | |
1109 | for (mirror_index = 0; | |
1110 | mirror_index < BTRFS_MAX_MIRRORS && | |
1111 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1112 | mirror_index++) { | |
1113 | if (!sblocks_for_recheck[mirror_index]. | |
1114 | pagev[page_num]->io_error) { | |
1115 | sblock_other = sblocks_for_recheck + | |
1116 | mirror_index; | |
1117 | break; | |
1118 | } | |
1119 | } | |
1120 | if (!sblock_other) | |
1121 | success = 0; | |
1122 | } | |
1123 | ||
1124 | if (sctx->is_dev_replace) { | |
1125 | /* | |
1126 | * did not find a mirror to fetch the page | |
1127 | * from. scrub_write_page_to_dev_replace() | |
1128 | * handles this case (page->io_error), by | |
1129 | * filling the block with zeros before | |
1130 | * submitting the write request | |
1131 | */ | |
1132 | if (!sblock_other) | |
1133 | sblock_other = sblock_bad; | |
1134 | ||
1135 | if (scrub_write_page_to_dev_replace(sblock_other, | |
1136 | page_num) != 0) { | |
1137 | atomic64_inc( | |
1138 | &fs_info->dev_replace.num_write_errors); | |
1139 | success = 0; | |
1140 | } | |
1141 | } else if (sblock_other) { | |
1142 | ret = scrub_repair_page_from_good_copy(sblock_bad, | |
1143 | sblock_other, | |
1144 | page_num, 0); | |
1145 | if (0 == ret) | |
1146 | spage_bad->io_error = 0; | |
1147 | else | |
1148 | success = 0; | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | if (success && !sctx->is_dev_replace) { | |
1153 | if (is_metadata || have_csum) { | |
1154 | /* | |
1155 | * need to verify the checksum now that all | |
1156 | * sectors on disk are repaired (the write | |
1157 | * request for data to be repaired is on its way). | |
1158 | * Just be lazy and use scrub_recheck_block() | |
1159 | * which re-reads the data before the checksum | |
1160 | * is verified, but most likely the data comes out | |
1161 | * of the page cache. | |
1162 | */ | |
1163 | scrub_recheck_block(fs_info, sblock_bad, 1); | |
1164 | if (!sblock_bad->header_error && | |
1165 | !sblock_bad->checksum_error && | |
1166 | sblock_bad->no_io_error_seen) | |
1167 | goto corrected_error; | |
1168 | else | |
1169 | goto did_not_correct_error; | |
1170 | } else { | |
1171 | corrected_error: | |
1172 | spin_lock(&sctx->stat_lock); | |
1173 | sctx->stat.corrected_errors++; | |
1174 | sblock_to_check->data_corrected = 1; | |
1175 | spin_unlock(&sctx->stat_lock); | |
1176 | btrfs_err_rl_in_rcu(fs_info, | |
1177 | "fixed up error at logical %llu on dev %s", | |
1178 | logical, rcu_str_deref(dev->name)); | |
1179 | } | |
1180 | } else { | |
1181 | did_not_correct_error: | |
1182 | spin_lock(&sctx->stat_lock); | |
1183 | sctx->stat.uncorrectable_errors++; | |
1184 | spin_unlock(&sctx->stat_lock); | |
1185 | btrfs_err_rl_in_rcu(fs_info, | |
1186 | "unable to fixup (regular) error at logical %llu on dev %s", | |
1187 | logical, rcu_str_deref(dev->name)); | |
1188 | } | |
1189 | ||
1190 | out: | |
1191 | if (sblocks_for_recheck) { | |
1192 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; | |
1193 | mirror_index++) { | |
1194 | struct scrub_block *sblock = sblocks_for_recheck + | |
1195 | mirror_index; | |
1196 | struct scrub_recover *recover; | |
1197 | int page_index; | |
1198 | ||
1199 | for (page_index = 0; page_index < sblock->page_count; | |
1200 | page_index++) { | |
1201 | sblock->pagev[page_index]->sblock = NULL; | |
1202 | recover = sblock->pagev[page_index]->recover; | |
1203 | if (recover) { | |
1204 | scrub_put_recover(fs_info, recover); | |
1205 | sblock->pagev[page_index]->recover = | |
1206 | NULL; | |
1207 | } | |
1208 | scrub_page_put(sblock->pagev[page_index]); | |
1209 | } | |
1210 | } | |
1211 | kfree(sblocks_for_recheck); | |
1212 | } | |
1213 | ||
1214 | ret = unlock_full_stripe(fs_info, logical, full_stripe_locked); | |
1215 | memalloc_nofs_restore(nofs_flag); | |
1216 | if (ret < 0) | |
1217 | return ret; | |
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio) | |
1222 | { | |
1223 | if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5) | |
1224 | return 2; | |
1225 | else if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID6) | |
1226 | return 3; | |
1227 | else | |
1228 | return (int)bbio->num_stripes; | |
1229 | } | |
1230 | ||
1231 | static inline void scrub_stripe_index_and_offset(u64 logical, u64 map_type, | |
1232 | u64 *raid_map, | |
1233 | u64 mapped_length, | |
1234 | int nstripes, int mirror, | |
1235 | int *stripe_index, | |
1236 | u64 *stripe_offset) | |
1237 | { | |
1238 | int i; | |
1239 | ||
1240 | if (map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) { | |
1241 | /* RAID5/6 */ | |
1242 | for (i = 0; i < nstripes; i++) { | |
1243 | if (raid_map[i] == RAID6_Q_STRIPE || | |
1244 | raid_map[i] == RAID5_P_STRIPE) | |
1245 | continue; | |
1246 | ||
1247 | if (logical >= raid_map[i] && | |
1248 | logical < raid_map[i] + mapped_length) | |
1249 | break; | |
1250 | } | |
1251 | ||
1252 | *stripe_index = i; | |
1253 | *stripe_offset = logical - raid_map[i]; | |
1254 | } else { | |
1255 | /* The other RAID type */ | |
1256 | *stripe_index = mirror; | |
1257 | *stripe_offset = 0; | |
1258 | } | |
1259 | } | |
1260 | ||
1261 | static int scrub_setup_recheck_block(struct scrub_block *original_sblock, | |
1262 | struct scrub_block *sblocks_for_recheck) | |
1263 | { | |
1264 | struct scrub_ctx *sctx = original_sblock->sctx; | |
1265 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
1266 | u64 length = original_sblock->page_count * fs_info->sectorsize; | |
1267 | u64 logical = original_sblock->pagev[0]->logical; | |
1268 | u64 generation = original_sblock->pagev[0]->generation; | |
1269 | u64 flags = original_sblock->pagev[0]->flags; | |
1270 | u64 have_csum = original_sblock->pagev[0]->have_csum; | |
1271 | struct scrub_recover *recover; | |
1272 | struct btrfs_bio *bbio; | |
1273 | u64 sublen; | |
1274 | u64 mapped_length; | |
1275 | u64 stripe_offset; | |
1276 | int stripe_index; | |
1277 | int page_index = 0; | |
1278 | int mirror_index; | |
1279 | int nmirrors; | |
1280 | int ret; | |
1281 | ||
1282 | /* | |
1283 | * note: the two members refs and outstanding_pages | |
1284 | * are not used (and not set) in the blocks that are used for | |
1285 | * the recheck procedure | |
1286 | */ | |
1287 | ||
1288 | while (length > 0) { | |
1289 | sublen = min_t(u64, length, fs_info->sectorsize); | |
1290 | mapped_length = sublen; | |
1291 | bbio = NULL; | |
1292 | ||
1293 | /* | |
1294 | * With a length of sectorsize, each returned stripe represents | |
1295 | * one mirror | |
1296 | */ | |
1297 | btrfs_bio_counter_inc_blocked(fs_info); | |
1298 | ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, | |
1299 | logical, &mapped_length, &bbio); | |
1300 | if (ret || !bbio || mapped_length < sublen) { | |
1301 | btrfs_put_bbio(bbio); | |
1302 | btrfs_bio_counter_dec(fs_info); | |
1303 | return -EIO; | |
1304 | } | |
1305 | ||
1306 | recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS); | |
1307 | if (!recover) { | |
1308 | btrfs_put_bbio(bbio); | |
1309 | btrfs_bio_counter_dec(fs_info); | |
1310 | return -ENOMEM; | |
1311 | } | |
1312 | ||
1313 | refcount_set(&recover->refs, 1); | |
1314 | recover->bbio = bbio; | |
1315 | recover->map_length = mapped_length; | |
1316 | ||
1317 | BUG_ON(page_index >= SCRUB_MAX_PAGES_PER_BLOCK); | |
1318 | ||
1319 | nmirrors = min(scrub_nr_raid_mirrors(bbio), BTRFS_MAX_MIRRORS); | |
1320 | ||
1321 | for (mirror_index = 0; mirror_index < nmirrors; | |
1322 | mirror_index++) { | |
1323 | struct scrub_block *sblock; | |
1324 | struct scrub_page *spage; | |
1325 | ||
1326 | sblock = sblocks_for_recheck + mirror_index; | |
1327 | sblock->sctx = sctx; | |
1328 | ||
1329 | spage = kzalloc(sizeof(*spage), GFP_NOFS); | |
1330 | if (!spage) { | |
1331 | leave_nomem: | |
1332 | spin_lock(&sctx->stat_lock); | |
1333 | sctx->stat.malloc_errors++; | |
1334 | spin_unlock(&sctx->stat_lock); | |
1335 | scrub_put_recover(fs_info, recover); | |
1336 | return -ENOMEM; | |
1337 | } | |
1338 | scrub_page_get(spage); | |
1339 | sblock->pagev[page_index] = spage; | |
1340 | spage->sblock = sblock; | |
1341 | spage->flags = flags; | |
1342 | spage->generation = generation; | |
1343 | spage->logical = logical; | |
1344 | spage->have_csum = have_csum; | |
1345 | if (have_csum) | |
1346 | memcpy(spage->csum, | |
1347 | original_sblock->pagev[0]->csum, | |
1348 | sctx->fs_info->csum_size); | |
1349 | ||
1350 | scrub_stripe_index_and_offset(logical, | |
1351 | bbio->map_type, | |
1352 | bbio->raid_map, | |
1353 | mapped_length, | |
1354 | bbio->num_stripes - | |
1355 | bbio->num_tgtdevs, | |
1356 | mirror_index, | |
1357 | &stripe_index, | |
1358 | &stripe_offset); | |
1359 | spage->physical = bbio->stripes[stripe_index].physical + | |
1360 | stripe_offset; | |
1361 | spage->dev = bbio->stripes[stripe_index].dev; | |
1362 | ||
1363 | BUG_ON(page_index >= original_sblock->page_count); | |
1364 | spage->physical_for_dev_replace = | |
1365 | original_sblock->pagev[page_index]-> | |
1366 | physical_for_dev_replace; | |
1367 | /* for missing devices, dev->bdev is NULL */ | |
1368 | spage->mirror_num = mirror_index + 1; | |
1369 | sblock->page_count++; | |
1370 | spage->page = alloc_page(GFP_NOFS); | |
1371 | if (!spage->page) | |
1372 | goto leave_nomem; | |
1373 | ||
1374 | scrub_get_recover(recover); | |
1375 | spage->recover = recover; | |
1376 | } | |
1377 | scrub_put_recover(fs_info, recover); | |
1378 | length -= sublen; | |
1379 | logical += sublen; | |
1380 | page_index++; | |
1381 | } | |
1382 | ||
1383 | return 0; | |
1384 | } | |
1385 | ||
1386 | static void scrub_bio_wait_endio(struct bio *bio) | |
1387 | { | |
1388 | complete(bio->bi_private); | |
1389 | } | |
1390 | ||
1391 | static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info, | |
1392 | struct bio *bio, | |
1393 | struct scrub_page *spage) | |
1394 | { | |
1395 | DECLARE_COMPLETION_ONSTACK(done); | |
1396 | int ret; | |
1397 | int mirror_num; | |
1398 | ||
1399 | bio->bi_iter.bi_sector = spage->logical >> 9; | |
1400 | bio->bi_private = &done; | |
1401 | bio->bi_end_io = scrub_bio_wait_endio; | |
1402 | ||
1403 | mirror_num = spage->sblock->pagev[0]->mirror_num; | |
1404 | ret = raid56_parity_recover(fs_info, bio, spage->recover->bbio, | |
1405 | spage->recover->map_length, | |
1406 | mirror_num, 0); | |
1407 | if (ret) | |
1408 | return ret; | |
1409 | ||
1410 | wait_for_completion_io(&done); | |
1411 | return blk_status_to_errno(bio->bi_status); | |
1412 | } | |
1413 | ||
1414 | static void scrub_recheck_block_on_raid56(struct btrfs_fs_info *fs_info, | |
1415 | struct scrub_block *sblock) | |
1416 | { | |
1417 | struct scrub_page *first_page = sblock->pagev[0]; | |
1418 | struct bio *bio; | |
1419 | int page_num; | |
1420 | ||
1421 | /* All pages in sblock belong to the same stripe on the same device. */ | |
1422 | ASSERT(first_page->dev); | |
1423 | if (!first_page->dev->bdev) | |
1424 | goto out; | |
1425 | ||
1426 | bio = btrfs_io_bio_alloc(BIO_MAX_VECS); | |
1427 | bio_set_dev(bio, first_page->dev->bdev); | |
1428 | ||
1429 | for (page_num = 0; page_num < sblock->page_count; page_num++) { | |
1430 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1431 | ||
1432 | WARN_ON(!spage->page); | |
1433 | bio_add_page(bio, spage->page, PAGE_SIZE, 0); | |
1434 | } | |
1435 | ||
1436 | if (scrub_submit_raid56_bio_wait(fs_info, bio, first_page)) { | |
1437 | bio_put(bio); | |
1438 | goto out; | |
1439 | } | |
1440 | ||
1441 | bio_put(bio); | |
1442 | ||
1443 | scrub_recheck_block_checksum(sblock); | |
1444 | ||
1445 | return; | |
1446 | out: | |
1447 | for (page_num = 0; page_num < sblock->page_count; page_num++) | |
1448 | sblock->pagev[page_num]->io_error = 1; | |
1449 | ||
1450 | sblock->no_io_error_seen = 0; | |
1451 | } | |
1452 | ||
1453 | /* | |
1454 | * this function will check the on disk data for checksum errors, header | |
1455 | * errors and read I/O errors. If any I/O errors happen, the exact pages | |
1456 | * which are errored are marked as being bad. The goal is to enable scrub | |
1457 | * to take those pages that are not errored from all the mirrors so that | |
1458 | * the pages that are errored in the just handled mirror can be repaired. | |
1459 | */ | |
1460 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, | |
1461 | struct scrub_block *sblock, | |
1462 | int retry_failed_mirror) | |
1463 | { | |
1464 | int page_num; | |
1465 | ||
1466 | sblock->no_io_error_seen = 1; | |
1467 | ||
1468 | /* short cut for raid56 */ | |
1469 | if (!retry_failed_mirror && scrub_is_page_on_raid56(sblock->pagev[0])) | |
1470 | return scrub_recheck_block_on_raid56(fs_info, sblock); | |
1471 | ||
1472 | for (page_num = 0; page_num < sblock->page_count; page_num++) { | |
1473 | struct bio *bio; | |
1474 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1475 | ||
1476 | if (spage->dev->bdev == NULL) { | |
1477 | spage->io_error = 1; | |
1478 | sblock->no_io_error_seen = 0; | |
1479 | continue; | |
1480 | } | |
1481 | ||
1482 | WARN_ON(!spage->page); | |
1483 | bio = btrfs_io_bio_alloc(1); | |
1484 | bio_set_dev(bio, spage->dev->bdev); | |
1485 | ||
1486 | bio_add_page(bio, spage->page, fs_info->sectorsize, 0); | |
1487 | bio->bi_iter.bi_sector = spage->physical >> 9; | |
1488 | bio->bi_opf = REQ_OP_READ; | |
1489 | ||
1490 | if (btrfsic_submit_bio_wait(bio)) { | |
1491 | spage->io_error = 1; | |
1492 | sblock->no_io_error_seen = 0; | |
1493 | } | |
1494 | ||
1495 | bio_put(bio); | |
1496 | } | |
1497 | ||
1498 | if (sblock->no_io_error_seen) | |
1499 | scrub_recheck_block_checksum(sblock); | |
1500 | } | |
1501 | ||
1502 | static inline int scrub_check_fsid(u8 fsid[], | |
1503 | struct scrub_page *spage) | |
1504 | { | |
1505 | struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices; | |
1506 | int ret; | |
1507 | ||
1508 | ret = memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1509 | return !ret; | |
1510 | } | |
1511 | ||
1512 | static void scrub_recheck_block_checksum(struct scrub_block *sblock) | |
1513 | { | |
1514 | sblock->header_error = 0; | |
1515 | sblock->checksum_error = 0; | |
1516 | sblock->generation_error = 0; | |
1517 | ||
1518 | if (sblock->pagev[0]->flags & BTRFS_EXTENT_FLAG_DATA) | |
1519 | scrub_checksum_data(sblock); | |
1520 | else | |
1521 | scrub_checksum_tree_block(sblock); | |
1522 | } | |
1523 | ||
1524 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, | |
1525 | struct scrub_block *sblock_good) | |
1526 | { | |
1527 | int page_num; | |
1528 | int ret = 0; | |
1529 | ||
1530 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { | |
1531 | int ret_sub; | |
1532 | ||
1533 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, | |
1534 | sblock_good, | |
1535 | page_num, 1); | |
1536 | if (ret_sub) | |
1537 | ret = ret_sub; | |
1538 | } | |
1539 | ||
1540 | return ret; | |
1541 | } | |
1542 | ||
1543 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
1544 | struct scrub_block *sblock_good, | |
1545 | int page_num, int force_write) | |
1546 | { | |
1547 | struct scrub_page *spage_bad = sblock_bad->pagev[page_num]; | |
1548 | struct scrub_page *spage_good = sblock_good->pagev[page_num]; | |
1549 | struct btrfs_fs_info *fs_info = sblock_bad->sctx->fs_info; | |
1550 | const u32 sectorsize = fs_info->sectorsize; | |
1551 | ||
1552 | BUG_ON(spage_bad->page == NULL); | |
1553 | BUG_ON(spage_good->page == NULL); | |
1554 | if (force_write || sblock_bad->header_error || | |
1555 | sblock_bad->checksum_error || spage_bad->io_error) { | |
1556 | struct bio *bio; | |
1557 | int ret; | |
1558 | ||
1559 | if (!spage_bad->dev->bdev) { | |
1560 | btrfs_warn_rl(fs_info, | |
1561 | "scrub_repair_page_from_good_copy(bdev == NULL) is unexpected"); | |
1562 | return -EIO; | |
1563 | } | |
1564 | ||
1565 | bio = btrfs_io_bio_alloc(1); | |
1566 | bio_set_dev(bio, spage_bad->dev->bdev); | |
1567 | bio->bi_iter.bi_sector = spage_bad->physical >> 9; | |
1568 | bio->bi_opf = REQ_OP_WRITE; | |
1569 | ||
1570 | ret = bio_add_page(bio, spage_good->page, sectorsize, 0); | |
1571 | if (ret != sectorsize) { | |
1572 | bio_put(bio); | |
1573 | return -EIO; | |
1574 | } | |
1575 | ||
1576 | if (btrfsic_submit_bio_wait(bio)) { | |
1577 | btrfs_dev_stat_inc_and_print(spage_bad->dev, | |
1578 | BTRFS_DEV_STAT_WRITE_ERRS); | |
1579 | atomic64_inc(&fs_info->dev_replace.num_write_errors); | |
1580 | bio_put(bio); | |
1581 | return -EIO; | |
1582 | } | |
1583 | bio_put(bio); | |
1584 | } | |
1585 | ||
1586 | return 0; | |
1587 | } | |
1588 | ||
1589 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) | |
1590 | { | |
1591 | struct btrfs_fs_info *fs_info = sblock->sctx->fs_info; | |
1592 | int page_num; | |
1593 | ||
1594 | /* | |
1595 | * This block is used for the check of the parity on the source device, | |
1596 | * so the data needn't be written into the destination device. | |
1597 | */ | |
1598 | if (sblock->sparity) | |
1599 | return; | |
1600 | ||
1601 | for (page_num = 0; page_num < sblock->page_count; page_num++) { | |
1602 | int ret; | |
1603 | ||
1604 | ret = scrub_write_page_to_dev_replace(sblock, page_num); | |
1605 | if (ret) | |
1606 | atomic64_inc(&fs_info->dev_replace.num_write_errors); | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
1611 | int page_num) | |
1612 | { | |
1613 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1614 | ||
1615 | BUG_ON(spage->page == NULL); | |
1616 | if (spage->io_error) | |
1617 | clear_page(page_address(spage->page)); | |
1618 | ||
1619 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); | |
1620 | } | |
1621 | ||
1622 | static int fill_writer_pointer_gap(struct scrub_ctx *sctx, u64 physical) | |
1623 | { | |
1624 | int ret = 0; | |
1625 | u64 length; | |
1626 | ||
1627 | if (!btrfs_is_zoned(sctx->fs_info)) | |
1628 | return 0; | |
1629 | ||
1630 | if (!btrfs_dev_is_sequential(sctx->wr_tgtdev, physical)) | |
1631 | return 0; | |
1632 | ||
1633 | if (sctx->write_pointer < physical) { | |
1634 | length = physical - sctx->write_pointer; | |
1635 | ||
1636 | ret = btrfs_zoned_issue_zeroout(sctx->wr_tgtdev, | |
1637 | sctx->write_pointer, length); | |
1638 | if (!ret) | |
1639 | sctx->write_pointer = physical; | |
1640 | } | |
1641 | return ret; | |
1642 | } | |
1643 | ||
1644 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
1645 | struct scrub_page *spage) | |
1646 | { | |
1647 | struct scrub_bio *sbio; | |
1648 | int ret; | |
1649 | const u32 sectorsize = sctx->fs_info->sectorsize; | |
1650 | ||
1651 | mutex_lock(&sctx->wr_lock); | |
1652 | again: | |
1653 | if (!sctx->wr_curr_bio) { | |
1654 | sctx->wr_curr_bio = kzalloc(sizeof(*sctx->wr_curr_bio), | |
1655 | GFP_KERNEL); | |
1656 | if (!sctx->wr_curr_bio) { | |
1657 | mutex_unlock(&sctx->wr_lock); | |
1658 | return -ENOMEM; | |
1659 | } | |
1660 | sctx->wr_curr_bio->sctx = sctx; | |
1661 | sctx->wr_curr_bio->page_count = 0; | |
1662 | } | |
1663 | sbio = sctx->wr_curr_bio; | |
1664 | if (sbio->page_count == 0) { | |
1665 | struct bio *bio; | |
1666 | ||
1667 | ret = fill_writer_pointer_gap(sctx, | |
1668 | spage->physical_for_dev_replace); | |
1669 | if (ret) { | |
1670 | mutex_unlock(&sctx->wr_lock); | |
1671 | return ret; | |
1672 | } | |
1673 | ||
1674 | sbio->physical = spage->physical_for_dev_replace; | |
1675 | sbio->logical = spage->logical; | |
1676 | sbio->dev = sctx->wr_tgtdev; | |
1677 | bio = sbio->bio; | |
1678 | if (!bio) { | |
1679 | bio = btrfs_io_bio_alloc(sctx->pages_per_wr_bio); | |
1680 | sbio->bio = bio; | |
1681 | } | |
1682 | ||
1683 | bio->bi_private = sbio; | |
1684 | bio->bi_end_io = scrub_wr_bio_end_io; | |
1685 | bio_set_dev(bio, sbio->dev->bdev); | |
1686 | bio->bi_iter.bi_sector = sbio->physical >> 9; | |
1687 | bio->bi_opf = REQ_OP_WRITE; | |
1688 | sbio->status = 0; | |
1689 | } else if (sbio->physical + sbio->page_count * sectorsize != | |
1690 | spage->physical_for_dev_replace || | |
1691 | sbio->logical + sbio->page_count * sectorsize != | |
1692 | spage->logical) { | |
1693 | scrub_wr_submit(sctx); | |
1694 | goto again; | |
1695 | } | |
1696 | ||
1697 | ret = bio_add_page(sbio->bio, spage->page, sectorsize, 0); | |
1698 | if (ret != sectorsize) { | |
1699 | if (sbio->page_count < 1) { | |
1700 | bio_put(sbio->bio); | |
1701 | sbio->bio = NULL; | |
1702 | mutex_unlock(&sctx->wr_lock); | |
1703 | return -EIO; | |
1704 | } | |
1705 | scrub_wr_submit(sctx); | |
1706 | goto again; | |
1707 | } | |
1708 | ||
1709 | sbio->pagev[sbio->page_count] = spage; | |
1710 | scrub_page_get(spage); | |
1711 | sbio->page_count++; | |
1712 | if (sbio->page_count == sctx->pages_per_wr_bio) | |
1713 | scrub_wr_submit(sctx); | |
1714 | mutex_unlock(&sctx->wr_lock); | |
1715 | ||
1716 | return 0; | |
1717 | } | |
1718 | ||
1719 | static void scrub_wr_submit(struct scrub_ctx *sctx) | |
1720 | { | |
1721 | struct scrub_bio *sbio; | |
1722 | ||
1723 | if (!sctx->wr_curr_bio) | |
1724 | return; | |
1725 | ||
1726 | sbio = sctx->wr_curr_bio; | |
1727 | sctx->wr_curr_bio = NULL; | |
1728 | WARN_ON(!sbio->bio->bi_bdev); | |
1729 | scrub_pending_bio_inc(sctx); | |
1730 | /* process all writes in a single worker thread. Then the block layer | |
1731 | * orders the requests before sending them to the driver which | |
1732 | * doubled the write performance on spinning disks when measured | |
1733 | * with Linux 3.5 */ | |
1734 | btrfsic_submit_bio(sbio->bio); | |
1735 | ||
1736 | if (btrfs_is_zoned(sctx->fs_info)) | |
1737 | sctx->write_pointer = sbio->physical + sbio->page_count * | |
1738 | sctx->fs_info->sectorsize; | |
1739 | } | |
1740 | ||
1741 | static void scrub_wr_bio_end_io(struct bio *bio) | |
1742 | { | |
1743 | struct scrub_bio *sbio = bio->bi_private; | |
1744 | struct btrfs_fs_info *fs_info = sbio->dev->fs_info; | |
1745 | ||
1746 | sbio->status = bio->bi_status; | |
1747 | sbio->bio = bio; | |
1748 | ||
1749 | btrfs_init_work(&sbio->work, scrub_wr_bio_end_io_worker, NULL, NULL); | |
1750 | btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work); | |
1751 | } | |
1752 | ||
1753 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) | |
1754 | { | |
1755 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
1756 | struct scrub_ctx *sctx = sbio->sctx; | |
1757 | int i; | |
1758 | ||
1759 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); | |
1760 | if (sbio->status) { | |
1761 | struct btrfs_dev_replace *dev_replace = | |
1762 | &sbio->sctx->fs_info->dev_replace; | |
1763 | ||
1764 | for (i = 0; i < sbio->page_count; i++) { | |
1765 | struct scrub_page *spage = sbio->pagev[i]; | |
1766 | ||
1767 | spage->io_error = 1; | |
1768 | atomic64_inc(&dev_replace->num_write_errors); | |
1769 | } | |
1770 | } | |
1771 | ||
1772 | for (i = 0; i < sbio->page_count; i++) | |
1773 | scrub_page_put(sbio->pagev[i]); | |
1774 | ||
1775 | bio_put(sbio->bio); | |
1776 | kfree(sbio); | |
1777 | scrub_pending_bio_dec(sctx); | |
1778 | } | |
1779 | ||
1780 | static int scrub_checksum(struct scrub_block *sblock) | |
1781 | { | |
1782 | u64 flags; | |
1783 | int ret; | |
1784 | ||
1785 | /* | |
1786 | * No need to initialize these stats currently, | |
1787 | * because this function only use return value | |
1788 | * instead of these stats value. | |
1789 | * | |
1790 | * Todo: | |
1791 | * always use stats | |
1792 | */ | |
1793 | sblock->header_error = 0; | |
1794 | sblock->generation_error = 0; | |
1795 | sblock->checksum_error = 0; | |
1796 | ||
1797 | WARN_ON(sblock->page_count < 1); | |
1798 | flags = sblock->pagev[0]->flags; | |
1799 | ret = 0; | |
1800 | if (flags & BTRFS_EXTENT_FLAG_DATA) | |
1801 | ret = scrub_checksum_data(sblock); | |
1802 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) | |
1803 | ret = scrub_checksum_tree_block(sblock); | |
1804 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
1805 | (void)scrub_checksum_super(sblock); | |
1806 | else | |
1807 | WARN_ON(1); | |
1808 | if (ret) | |
1809 | scrub_handle_errored_block(sblock); | |
1810 | ||
1811 | return ret; | |
1812 | } | |
1813 | ||
1814 | static int scrub_checksum_data(struct scrub_block *sblock) | |
1815 | { | |
1816 | struct scrub_ctx *sctx = sblock->sctx; | |
1817 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
1818 | SHASH_DESC_ON_STACK(shash, fs_info->csum_shash); | |
1819 | u8 csum[BTRFS_CSUM_SIZE]; | |
1820 | struct scrub_page *spage; | |
1821 | char *kaddr; | |
1822 | ||
1823 | BUG_ON(sblock->page_count < 1); | |
1824 | spage = sblock->pagev[0]; | |
1825 | if (!spage->have_csum) | |
1826 | return 0; | |
1827 | ||
1828 | kaddr = page_address(spage->page); | |
1829 | ||
1830 | shash->tfm = fs_info->csum_shash; | |
1831 | crypto_shash_init(shash); | |
1832 | ||
1833 | /* | |
1834 | * In scrub_pages() and scrub_pages_for_parity() we ensure each spage | |
1835 | * only contains one sector of data. | |
1836 | */ | |
1837 | crypto_shash_digest(shash, kaddr, fs_info->sectorsize, csum); | |
1838 | ||
1839 | if (memcmp(csum, spage->csum, fs_info->csum_size)) | |
1840 | sblock->checksum_error = 1; | |
1841 | return sblock->checksum_error; | |
1842 | } | |
1843 | ||
1844 | static int scrub_checksum_tree_block(struct scrub_block *sblock) | |
1845 | { | |
1846 | struct scrub_ctx *sctx = sblock->sctx; | |
1847 | struct btrfs_header *h; | |
1848 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
1849 | SHASH_DESC_ON_STACK(shash, fs_info->csum_shash); | |
1850 | u8 calculated_csum[BTRFS_CSUM_SIZE]; | |
1851 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1852 | /* | |
1853 | * This is done in sectorsize steps even for metadata as there's a | |
1854 | * constraint for nodesize to be aligned to sectorsize. This will need | |
1855 | * to change so we don't misuse data and metadata units like that. | |
1856 | */ | |
1857 | const u32 sectorsize = sctx->fs_info->sectorsize; | |
1858 | const int num_sectors = fs_info->nodesize >> fs_info->sectorsize_bits; | |
1859 | int i; | |
1860 | struct scrub_page *spage; | |
1861 | char *kaddr; | |
1862 | ||
1863 | BUG_ON(sblock->page_count < 1); | |
1864 | ||
1865 | /* Each member in pagev is just one block, not a full page */ | |
1866 | ASSERT(sblock->page_count == num_sectors); | |
1867 | ||
1868 | spage = sblock->pagev[0]; | |
1869 | kaddr = page_address(spage->page); | |
1870 | h = (struct btrfs_header *)kaddr; | |
1871 | memcpy(on_disk_csum, h->csum, sctx->fs_info->csum_size); | |
1872 | ||
1873 | /* | |
1874 | * we don't use the getter functions here, as we | |
1875 | * a) don't have an extent buffer and | |
1876 | * b) the page is already kmapped | |
1877 | */ | |
1878 | if (spage->logical != btrfs_stack_header_bytenr(h)) | |
1879 | sblock->header_error = 1; | |
1880 | ||
1881 | if (spage->generation != btrfs_stack_header_generation(h)) { | |
1882 | sblock->header_error = 1; | |
1883 | sblock->generation_error = 1; | |
1884 | } | |
1885 | ||
1886 | if (!scrub_check_fsid(h->fsid, spage)) | |
1887 | sblock->header_error = 1; | |
1888 | ||
1889 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
1890 | BTRFS_UUID_SIZE)) | |
1891 | sblock->header_error = 1; | |
1892 | ||
1893 | shash->tfm = fs_info->csum_shash; | |
1894 | crypto_shash_init(shash); | |
1895 | crypto_shash_update(shash, kaddr + BTRFS_CSUM_SIZE, | |
1896 | sectorsize - BTRFS_CSUM_SIZE); | |
1897 | ||
1898 | for (i = 1; i < num_sectors; i++) { | |
1899 | kaddr = page_address(sblock->pagev[i]->page); | |
1900 | crypto_shash_update(shash, kaddr, sectorsize); | |
1901 | } | |
1902 | ||
1903 | crypto_shash_final(shash, calculated_csum); | |
1904 | if (memcmp(calculated_csum, on_disk_csum, sctx->fs_info->csum_size)) | |
1905 | sblock->checksum_error = 1; | |
1906 | ||
1907 | return sblock->header_error || sblock->checksum_error; | |
1908 | } | |
1909 | ||
1910 | static int scrub_checksum_super(struct scrub_block *sblock) | |
1911 | { | |
1912 | struct btrfs_super_block *s; | |
1913 | struct scrub_ctx *sctx = sblock->sctx; | |
1914 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
1915 | SHASH_DESC_ON_STACK(shash, fs_info->csum_shash); | |
1916 | u8 calculated_csum[BTRFS_CSUM_SIZE]; | |
1917 | struct scrub_page *spage; | |
1918 | char *kaddr; | |
1919 | int fail_gen = 0; | |
1920 | int fail_cor = 0; | |
1921 | ||
1922 | BUG_ON(sblock->page_count < 1); | |
1923 | spage = sblock->pagev[0]; | |
1924 | kaddr = page_address(spage->page); | |
1925 | s = (struct btrfs_super_block *)kaddr; | |
1926 | ||
1927 | if (spage->logical != btrfs_super_bytenr(s)) | |
1928 | ++fail_cor; | |
1929 | ||
1930 | if (spage->generation != btrfs_super_generation(s)) | |
1931 | ++fail_gen; | |
1932 | ||
1933 | if (!scrub_check_fsid(s->fsid, spage)) | |
1934 | ++fail_cor; | |
1935 | ||
1936 | shash->tfm = fs_info->csum_shash; | |
1937 | crypto_shash_init(shash); | |
1938 | crypto_shash_digest(shash, kaddr + BTRFS_CSUM_SIZE, | |
1939 | BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, calculated_csum); | |
1940 | ||
1941 | if (memcmp(calculated_csum, s->csum, sctx->fs_info->csum_size)) | |
1942 | ++fail_cor; | |
1943 | ||
1944 | if (fail_cor + fail_gen) { | |
1945 | /* | |
1946 | * if we find an error in a super block, we just report it. | |
1947 | * They will get written with the next transaction commit | |
1948 | * anyway | |
1949 | */ | |
1950 | spin_lock(&sctx->stat_lock); | |
1951 | ++sctx->stat.super_errors; | |
1952 | spin_unlock(&sctx->stat_lock); | |
1953 | if (fail_cor) | |
1954 | btrfs_dev_stat_inc_and_print(spage->dev, | |
1955 | BTRFS_DEV_STAT_CORRUPTION_ERRS); | |
1956 | else | |
1957 | btrfs_dev_stat_inc_and_print(spage->dev, | |
1958 | BTRFS_DEV_STAT_GENERATION_ERRS); | |
1959 | } | |
1960 | ||
1961 | return fail_cor + fail_gen; | |
1962 | } | |
1963 | ||
1964 | static void scrub_block_get(struct scrub_block *sblock) | |
1965 | { | |
1966 | refcount_inc(&sblock->refs); | |
1967 | } | |
1968 | ||
1969 | static void scrub_block_put(struct scrub_block *sblock) | |
1970 | { | |
1971 | if (refcount_dec_and_test(&sblock->refs)) { | |
1972 | int i; | |
1973 | ||
1974 | if (sblock->sparity) | |
1975 | scrub_parity_put(sblock->sparity); | |
1976 | ||
1977 | for (i = 0; i < sblock->page_count; i++) | |
1978 | scrub_page_put(sblock->pagev[i]); | |
1979 | kfree(sblock); | |
1980 | } | |
1981 | } | |
1982 | ||
1983 | static void scrub_page_get(struct scrub_page *spage) | |
1984 | { | |
1985 | atomic_inc(&spage->refs); | |
1986 | } | |
1987 | ||
1988 | static void scrub_page_put(struct scrub_page *spage) | |
1989 | { | |
1990 | if (atomic_dec_and_test(&spage->refs)) { | |
1991 | if (spage->page) | |
1992 | __free_page(spage->page); | |
1993 | kfree(spage); | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | /* | |
1998 | * Throttling of IO submission, bandwidth-limit based, the timeslice is 1 | |
1999 | * second. Limit can be set via /sys/fs/UUID/devinfo/devid/scrub_speed_max. | |
2000 | */ | |
2001 | static void scrub_throttle(struct scrub_ctx *sctx) | |
2002 | { | |
2003 | const int time_slice = 1000; | |
2004 | struct scrub_bio *sbio; | |
2005 | struct btrfs_device *device; | |
2006 | s64 delta; | |
2007 | ktime_t now; | |
2008 | u32 div; | |
2009 | u64 bwlimit; | |
2010 | ||
2011 | sbio = sctx->bios[sctx->curr]; | |
2012 | device = sbio->dev; | |
2013 | bwlimit = READ_ONCE(device->scrub_speed_max); | |
2014 | if (bwlimit == 0) | |
2015 | return; | |
2016 | ||
2017 | /* | |
2018 | * Slice is divided into intervals when the IO is submitted, adjust by | |
2019 | * bwlimit and maximum of 64 intervals. | |
2020 | */ | |
2021 | div = max_t(u32, 1, (u32)(bwlimit / (16 * 1024 * 1024))); | |
2022 | div = min_t(u32, 64, div); | |
2023 | ||
2024 | /* Start new epoch, set deadline */ | |
2025 | now = ktime_get(); | |
2026 | if (sctx->throttle_deadline == 0) { | |
2027 | sctx->throttle_deadline = ktime_add_ms(now, time_slice / div); | |
2028 | sctx->throttle_sent = 0; | |
2029 | } | |
2030 | ||
2031 | /* Still in the time to send? */ | |
2032 | if (ktime_before(now, sctx->throttle_deadline)) { | |
2033 | /* If current bio is within the limit, send it */ | |
2034 | sctx->throttle_sent += sbio->bio->bi_iter.bi_size; | |
2035 | if (sctx->throttle_sent <= div_u64(bwlimit, div)) | |
2036 | return; | |
2037 | ||
2038 | /* We're over the limit, sleep until the rest of the slice */ | |
2039 | delta = ktime_ms_delta(sctx->throttle_deadline, now); | |
2040 | } else { | |
2041 | /* New request after deadline, start new epoch */ | |
2042 | delta = 0; | |
2043 | } | |
2044 | ||
2045 | if (delta) { | |
2046 | long timeout; | |
2047 | ||
2048 | timeout = div_u64(delta * HZ, 1000); | |
2049 | schedule_timeout_interruptible(timeout); | |
2050 | } | |
2051 | ||
2052 | /* Next call will start the deadline period */ | |
2053 | sctx->throttle_deadline = 0; | |
2054 | } | |
2055 | ||
2056 | static void scrub_submit(struct scrub_ctx *sctx) | |
2057 | { | |
2058 | struct scrub_bio *sbio; | |
2059 | ||
2060 | if (sctx->curr == -1) | |
2061 | return; | |
2062 | ||
2063 | scrub_throttle(sctx); | |
2064 | ||
2065 | sbio = sctx->bios[sctx->curr]; | |
2066 | sctx->curr = -1; | |
2067 | scrub_pending_bio_inc(sctx); | |
2068 | btrfsic_submit_bio(sbio->bio); | |
2069 | } | |
2070 | ||
2071 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, | |
2072 | struct scrub_page *spage) | |
2073 | { | |
2074 | struct scrub_block *sblock = spage->sblock; | |
2075 | struct scrub_bio *sbio; | |
2076 | const u32 sectorsize = sctx->fs_info->sectorsize; | |
2077 | int ret; | |
2078 | ||
2079 | again: | |
2080 | /* | |
2081 | * grab a fresh bio or wait for one to become available | |
2082 | */ | |
2083 | while (sctx->curr == -1) { | |
2084 | spin_lock(&sctx->list_lock); | |
2085 | sctx->curr = sctx->first_free; | |
2086 | if (sctx->curr != -1) { | |
2087 | sctx->first_free = sctx->bios[sctx->curr]->next_free; | |
2088 | sctx->bios[sctx->curr]->next_free = -1; | |
2089 | sctx->bios[sctx->curr]->page_count = 0; | |
2090 | spin_unlock(&sctx->list_lock); | |
2091 | } else { | |
2092 | spin_unlock(&sctx->list_lock); | |
2093 | wait_event(sctx->list_wait, sctx->first_free != -1); | |
2094 | } | |
2095 | } | |
2096 | sbio = sctx->bios[sctx->curr]; | |
2097 | if (sbio->page_count == 0) { | |
2098 | struct bio *bio; | |
2099 | ||
2100 | sbio->physical = spage->physical; | |
2101 | sbio->logical = spage->logical; | |
2102 | sbio->dev = spage->dev; | |
2103 | bio = sbio->bio; | |
2104 | if (!bio) { | |
2105 | bio = btrfs_io_bio_alloc(sctx->pages_per_rd_bio); | |
2106 | sbio->bio = bio; | |
2107 | } | |
2108 | ||
2109 | bio->bi_private = sbio; | |
2110 | bio->bi_end_io = scrub_bio_end_io; | |
2111 | bio_set_dev(bio, sbio->dev->bdev); | |
2112 | bio->bi_iter.bi_sector = sbio->physical >> 9; | |
2113 | bio->bi_opf = REQ_OP_READ; | |
2114 | sbio->status = 0; | |
2115 | } else if (sbio->physical + sbio->page_count * sectorsize != | |
2116 | spage->physical || | |
2117 | sbio->logical + sbio->page_count * sectorsize != | |
2118 | spage->logical || | |
2119 | sbio->dev != spage->dev) { | |
2120 | scrub_submit(sctx); | |
2121 | goto again; | |
2122 | } | |
2123 | ||
2124 | sbio->pagev[sbio->page_count] = spage; | |
2125 | ret = bio_add_page(sbio->bio, spage->page, sectorsize, 0); | |
2126 | if (ret != sectorsize) { | |
2127 | if (sbio->page_count < 1) { | |
2128 | bio_put(sbio->bio); | |
2129 | sbio->bio = NULL; | |
2130 | return -EIO; | |
2131 | } | |
2132 | scrub_submit(sctx); | |
2133 | goto again; | |
2134 | } | |
2135 | ||
2136 | scrub_block_get(sblock); /* one for the page added to the bio */ | |
2137 | atomic_inc(&sblock->outstanding_pages); | |
2138 | sbio->page_count++; | |
2139 | if (sbio->page_count == sctx->pages_per_rd_bio) | |
2140 | scrub_submit(sctx); | |
2141 | ||
2142 | return 0; | |
2143 | } | |
2144 | ||
2145 | static void scrub_missing_raid56_end_io(struct bio *bio) | |
2146 | { | |
2147 | struct scrub_block *sblock = bio->bi_private; | |
2148 | struct btrfs_fs_info *fs_info = sblock->sctx->fs_info; | |
2149 | ||
2150 | if (bio->bi_status) | |
2151 | sblock->no_io_error_seen = 0; | |
2152 | ||
2153 | bio_put(bio); | |
2154 | ||
2155 | btrfs_queue_work(fs_info->scrub_workers, &sblock->work); | |
2156 | } | |
2157 | ||
2158 | static void scrub_missing_raid56_worker(struct btrfs_work *work) | |
2159 | { | |
2160 | struct scrub_block *sblock = container_of(work, struct scrub_block, work); | |
2161 | struct scrub_ctx *sctx = sblock->sctx; | |
2162 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
2163 | u64 logical; | |
2164 | struct btrfs_device *dev; | |
2165 | ||
2166 | logical = sblock->pagev[0]->logical; | |
2167 | dev = sblock->pagev[0]->dev; | |
2168 | ||
2169 | if (sblock->no_io_error_seen) | |
2170 | scrub_recheck_block_checksum(sblock); | |
2171 | ||
2172 | if (!sblock->no_io_error_seen) { | |
2173 | spin_lock(&sctx->stat_lock); | |
2174 | sctx->stat.read_errors++; | |
2175 | spin_unlock(&sctx->stat_lock); | |
2176 | btrfs_err_rl_in_rcu(fs_info, | |
2177 | "IO error rebuilding logical %llu for dev %s", | |
2178 | logical, rcu_str_deref(dev->name)); | |
2179 | } else if (sblock->header_error || sblock->checksum_error) { | |
2180 | spin_lock(&sctx->stat_lock); | |
2181 | sctx->stat.uncorrectable_errors++; | |
2182 | spin_unlock(&sctx->stat_lock); | |
2183 | btrfs_err_rl_in_rcu(fs_info, | |
2184 | "failed to rebuild valid logical %llu for dev %s", | |
2185 | logical, rcu_str_deref(dev->name)); | |
2186 | } else { | |
2187 | scrub_write_block_to_dev_replace(sblock); | |
2188 | } | |
2189 | ||
2190 | if (sctx->is_dev_replace && sctx->flush_all_writes) { | |
2191 | mutex_lock(&sctx->wr_lock); | |
2192 | scrub_wr_submit(sctx); | |
2193 | mutex_unlock(&sctx->wr_lock); | |
2194 | } | |
2195 | ||
2196 | scrub_block_put(sblock); | |
2197 | scrub_pending_bio_dec(sctx); | |
2198 | } | |
2199 | ||
2200 | static void scrub_missing_raid56_pages(struct scrub_block *sblock) | |
2201 | { | |
2202 | struct scrub_ctx *sctx = sblock->sctx; | |
2203 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
2204 | u64 length = sblock->page_count * PAGE_SIZE; | |
2205 | u64 logical = sblock->pagev[0]->logical; | |
2206 | struct btrfs_bio *bbio = NULL; | |
2207 | struct bio *bio; | |
2208 | struct btrfs_raid_bio *rbio; | |
2209 | int ret; | |
2210 | int i; | |
2211 | ||
2212 | btrfs_bio_counter_inc_blocked(fs_info); | |
2213 | ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical, | |
2214 | &length, &bbio); | |
2215 | if (ret || !bbio || !bbio->raid_map) | |
2216 | goto bbio_out; | |
2217 | ||
2218 | if (WARN_ON(!sctx->is_dev_replace || | |
2219 | !(bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK))) { | |
2220 | /* | |
2221 | * We shouldn't be scrubbing a missing device. Even for dev | |
2222 | * replace, we should only get here for RAID 5/6. We either | |
2223 | * managed to mount something with no mirrors remaining or | |
2224 | * there's a bug in scrub_remap_extent()/btrfs_map_block(). | |
2225 | */ | |
2226 | goto bbio_out; | |
2227 | } | |
2228 | ||
2229 | bio = btrfs_io_bio_alloc(0); | |
2230 | bio->bi_iter.bi_sector = logical >> 9; | |
2231 | bio->bi_private = sblock; | |
2232 | bio->bi_end_io = scrub_missing_raid56_end_io; | |
2233 | ||
2234 | rbio = raid56_alloc_missing_rbio(fs_info, bio, bbio, length); | |
2235 | if (!rbio) | |
2236 | goto rbio_out; | |
2237 | ||
2238 | for (i = 0; i < sblock->page_count; i++) { | |
2239 | struct scrub_page *spage = sblock->pagev[i]; | |
2240 | ||
2241 | raid56_add_scrub_pages(rbio, spage->page, spage->logical); | |
2242 | } | |
2243 | ||
2244 | btrfs_init_work(&sblock->work, scrub_missing_raid56_worker, NULL, NULL); | |
2245 | scrub_block_get(sblock); | |
2246 | scrub_pending_bio_inc(sctx); | |
2247 | raid56_submit_missing_rbio(rbio); | |
2248 | return; | |
2249 | ||
2250 | rbio_out: | |
2251 | bio_put(bio); | |
2252 | bbio_out: | |
2253 | btrfs_bio_counter_dec(fs_info); | |
2254 | btrfs_put_bbio(bbio); | |
2255 | spin_lock(&sctx->stat_lock); | |
2256 | sctx->stat.malloc_errors++; | |
2257 | spin_unlock(&sctx->stat_lock); | |
2258 | } | |
2259 | ||
2260 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u32 len, | |
2261 | u64 physical, struct btrfs_device *dev, u64 flags, | |
2262 | u64 gen, int mirror_num, u8 *csum, | |
2263 | u64 physical_for_dev_replace) | |
2264 | { | |
2265 | struct scrub_block *sblock; | |
2266 | const u32 sectorsize = sctx->fs_info->sectorsize; | |
2267 | int index; | |
2268 | ||
2269 | sblock = kzalloc(sizeof(*sblock), GFP_KERNEL); | |
2270 | if (!sblock) { | |
2271 | spin_lock(&sctx->stat_lock); | |
2272 | sctx->stat.malloc_errors++; | |
2273 | spin_unlock(&sctx->stat_lock); | |
2274 | return -ENOMEM; | |
2275 | } | |
2276 | ||
2277 | /* one ref inside this function, plus one for each page added to | |
2278 | * a bio later on */ | |
2279 | refcount_set(&sblock->refs, 1); | |
2280 | sblock->sctx = sctx; | |
2281 | sblock->no_io_error_seen = 1; | |
2282 | ||
2283 | for (index = 0; len > 0; index++) { | |
2284 | struct scrub_page *spage; | |
2285 | /* | |
2286 | * Here we will allocate one page for one sector to scrub. | |
2287 | * This is fine if PAGE_SIZE == sectorsize, but will cost | |
2288 | * more memory for PAGE_SIZE > sectorsize case. | |
2289 | */ | |
2290 | u32 l = min(sectorsize, len); | |
2291 | ||
2292 | spage = kzalloc(sizeof(*spage), GFP_KERNEL); | |
2293 | if (!spage) { | |
2294 | leave_nomem: | |
2295 | spin_lock(&sctx->stat_lock); | |
2296 | sctx->stat.malloc_errors++; | |
2297 | spin_unlock(&sctx->stat_lock); | |
2298 | scrub_block_put(sblock); | |
2299 | return -ENOMEM; | |
2300 | } | |
2301 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); | |
2302 | scrub_page_get(spage); | |
2303 | sblock->pagev[index] = spage; | |
2304 | spage->sblock = sblock; | |
2305 | spage->dev = dev; | |
2306 | spage->flags = flags; | |
2307 | spage->generation = gen; | |
2308 | spage->logical = logical; | |
2309 | spage->physical = physical; | |
2310 | spage->physical_for_dev_replace = physical_for_dev_replace; | |
2311 | spage->mirror_num = mirror_num; | |
2312 | if (csum) { | |
2313 | spage->have_csum = 1; | |
2314 | memcpy(spage->csum, csum, sctx->fs_info->csum_size); | |
2315 | } else { | |
2316 | spage->have_csum = 0; | |
2317 | } | |
2318 | sblock->page_count++; | |
2319 | spage->page = alloc_page(GFP_KERNEL); | |
2320 | if (!spage->page) | |
2321 | goto leave_nomem; | |
2322 | len -= l; | |
2323 | logical += l; | |
2324 | physical += l; | |
2325 | physical_for_dev_replace += l; | |
2326 | } | |
2327 | ||
2328 | WARN_ON(sblock->page_count == 0); | |
2329 | if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) { | |
2330 | /* | |
2331 | * This case should only be hit for RAID 5/6 device replace. See | |
2332 | * the comment in scrub_missing_raid56_pages() for details. | |
2333 | */ | |
2334 | scrub_missing_raid56_pages(sblock); | |
2335 | } else { | |
2336 | for (index = 0; index < sblock->page_count; index++) { | |
2337 | struct scrub_page *spage = sblock->pagev[index]; | |
2338 | int ret; | |
2339 | ||
2340 | ret = scrub_add_page_to_rd_bio(sctx, spage); | |
2341 | if (ret) { | |
2342 | scrub_block_put(sblock); | |
2343 | return ret; | |
2344 | } | |
2345 | } | |
2346 | ||
2347 | if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
2348 | scrub_submit(sctx); | |
2349 | } | |
2350 | ||
2351 | /* last one frees, either here or in bio completion for last page */ | |
2352 | scrub_block_put(sblock); | |
2353 | return 0; | |
2354 | } | |
2355 | ||
2356 | static void scrub_bio_end_io(struct bio *bio) | |
2357 | { | |
2358 | struct scrub_bio *sbio = bio->bi_private; | |
2359 | struct btrfs_fs_info *fs_info = sbio->dev->fs_info; | |
2360 | ||
2361 | sbio->status = bio->bi_status; | |
2362 | sbio->bio = bio; | |
2363 | ||
2364 | btrfs_queue_work(fs_info->scrub_workers, &sbio->work); | |
2365 | } | |
2366 | ||
2367 | static void scrub_bio_end_io_worker(struct btrfs_work *work) | |
2368 | { | |
2369 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
2370 | struct scrub_ctx *sctx = sbio->sctx; | |
2371 | int i; | |
2372 | ||
2373 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); | |
2374 | if (sbio->status) { | |
2375 | for (i = 0; i < sbio->page_count; i++) { | |
2376 | struct scrub_page *spage = sbio->pagev[i]; | |
2377 | ||
2378 | spage->io_error = 1; | |
2379 | spage->sblock->no_io_error_seen = 0; | |
2380 | } | |
2381 | } | |
2382 | ||
2383 | /* now complete the scrub_block items that have all pages completed */ | |
2384 | for (i = 0; i < sbio->page_count; i++) { | |
2385 | struct scrub_page *spage = sbio->pagev[i]; | |
2386 | struct scrub_block *sblock = spage->sblock; | |
2387 | ||
2388 | if (atomic_dec_and_test(&sblock->outstanding_pages)) | |
2389 | scrub_block_complete(sblock); | |
2390 | scrub_block_put(sblock); | |
2391 | } | |
2392 | ||
2393 | bio_put(sbio->bio); | |
2394 | sbio->bio = NULL; | |
2395 | spin_lock(&sctx->list_lock); | |
2396 | sbio->next_free = sctx->first_free; | |
2397 | sctx->first_free = sbio->index; | |
2398 | spin_unlock(&sctx->list_lock); | |
2399 | ||
2400 | if (sctx->is_dev_replace && sctx->flush_all_writes) { | |
2401 | mutex_lock(&sctx->wr_lock); | |
2402 | scrub_wr_submit(sctx); | |
2403 | mutex_unlock(&sctx->wr_lock); | |
2404 | } | |
2405 | ||
2406 | scrub_pending_bio_dec(sctx); | |
2407 | } | |
2408 | ||
2409 | static inline void __scrub_mark_bitmap(struct scrub_parity *sparity, | |
2410 | unsigned long *bitmap, | |
2411 | u64 start, u32 len) | |
2412 | { | |
2413 | u64 offset; | |
2414 | u32 nsectors; | |
2415 | u32 sectorsize_bits = sparity->sctx->fs_info->sectorsize_bits; | |
2416 | ||
2417 | if (len >= sparity->stripe_len) { | |
2418 | bitmap_set(bitmap, 0, sparity->nsectors); | |
2419 | return; | |
2420 | } | |
2421 | ||
2422 | start -= sparity->logic_start; | |
2423 | start = div64_u64_rem(start, sparity->stripe_len, &offset); | |
2424 | offset = offset >> sectorsize_bits; | |
2425 | nsectors = len >> sectorsize_bits; | |
2426 | ||
2427 | if (offset + nsectors <= sparity->nsectors) { | |
2428 | bitmap_set(bitmap, offset, nsectors); | |
2429 | return; | |
2430 | } | |
2431 | ||
2432 | bitmap_set(bitmap, offset, sparity->nsectors - offset); | |
2433 | bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset)); | |
2434 | } | |
2435 | ||
2436 | static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity, | |
2437 | u64 start, u32 len) | |
2438 | { | |
2439 | __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len); | |
2440 | } | |
2441 | ||
2442 | static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity, | |
2443 | u64 start, u32 len) | |
2444 | { | |
2445 | __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len); | |
2446 | } | |
2447 | ||
2448 | static void scrub_block_complete(struct scrub_block *sblock) | |
2449 | { | |
2450 | int corrupted = 0; | |
2451 | ||
2452 | if (!sblock->no_io_error_seen) { | |
2453 | corrupted = 1; | |
2454 | scrub_handle_errored_block(sblock); | |
2455 | } else { | |
2456 | /* | |
2457 | * if has checksum error, write via repair mechanism in | |
2458 | * dev replace case, otherwise write here in dev replace | |
2459 | * case. | |
2460 | */ | |
2461 | corrupted = scrub_checksum(sblock); | |
2462 | if (!corrupted && sblock->sctx->is_dev_replace) | |
2463 | scrub_write_block_to_dev_replace(sblock); | |
2464 | } | |
2465 | ||
2466 | if (sblock->sparity && corrupted && !sblock->data_corrected) { | |
2467 | u64 start = sblock->pagev[0]->logical; | |
2468 | u64 end = sblock->pagev[sblock->page_count - 1]->logical + | |
2469 | sblock->sctx->fs_info->sectorsize; | |
2470 | ||
2471 | ASSERT(end - start <= U32_MAX); | |
2472 | scrub_parity_mark_sectors_error(sblock->sparity, | |
2473 | start, end - start); | |
2474 | } | |
2475 | } | |
2476 | ||
2477 | static void drop_csum_range(struct scrub_ctx *sctx, struct btrfs_ordered_sum *sum) | |
2478 | { | |
2479 | sctx->stat.csum_discards += sum->len >> sctx->fs_info->sectorsize_bits; | |
2480 | list_del(&sum->list); | |
2481 | kfree(sum); | |
2482 | } | |
2483 | ||
2484 | /* | |
2485 | * Find the desired csum for range [logical, logical + sectorsize), and store | |
2486 | * the csum into @csum. | |
2487 | * | |
2488 | * The search source is sctx->csum_list, which is a pre-populated list | |
2489 | * storing bytenr ordered csum ranges. We're responsible to cleanup any range | |
2490 | * that is before @logical. | |
2491 | * | |
2492 | * Return 0 if there is no csum for the range. | |
2493 | * Return 1 if there is csum for the range and copied to @csum. | |
2494 | */ | |
2495 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u8 *csum) | |
2496 | { | |
2497 | bool found = false; | |
2498 | ||
2499 | while (!list_empty(&sctx->csum_list)) { | |
2500 | struct btrfs_ordered_sum *sum = NULL; | |
2501 | unsigned long index; | |
2502 | unsigned long num_sectors; | |
2503 | ||
2504 | sum = list_first_entry(&sctx->csum_list, | |
2505 | struct btrfs_ordered_sum, list); | |
2506 | /* The current csum range is beyond our range, no csum found */ | |
2507 | if (sum->bytenr > logical) | |
2508 | break; | |
2509 | ||
2510 | /* | |
2511 | * The current sum is before our bytenr, since scrub is always | |
2512 | * done in bytenr order, the csum will never be used anymore, | |
2513 | * clean it up so that later calls won't bother with the range, | |
2514 | * and continue search the next range. | |
2515 | */ | |
2516 | if (sum->bytenr + sum->len <= logical) { | |
2517 | drop_csum_range(sctx, sum); | |
2518 | continue; | |
2519 | } | |
2520 | ||
2521 | /* Now the csum range covers our bytenr, copy the csum */ | |
2522 | found = true; | |
2523 | index = (logical - sum->bytenr) >> sctx->fs_info->sectorsize_bits; | |
2524 | num_sectors = sum->len >> sctx->fs_info->sectorsize_bits; | |
2525 | ||
2526 | memcpy(csum, sum->sums + index * sctx->fs_info->csum_size, | |
2527 | sctx->fs_info->csum_size); | |
2528 | ||
2529 | /* Cleanup the range if we're at the end of the csum range */ | |
2530 | if (index == num_sectors - 1) | |
2531 | drop_csum_range(sctx, sum); | |
2532 | break; | |
2533 | } | |
2534 | if (!found) | |
2535 | return 0; | |
2536 | return 1; | |
2537 | } | |
2538 | ||
2539 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
2540 | static int scrub_extent(struct scrub_ctx *sctx, struct map_lookup *map, | |
2541 | u64 logical, u32 len, | |
2542 | u64 physical, struct btrfs_device *dev, u64 flags, | |
2543 | u64 gen, int mirror_num, u64 physical_for_dev_replace) | |
2544 | { | |
2545 | int ret; | |
2546 | u8 csum[BTRFS_CSUM_SIZE]; | |
2547 | u32 blocksize; | |
2548 | ||
2549 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2550 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) | |
2551 | blocksize = map->stripe_len; | |
2552 | else | |
2553 | blocksize = sctx->fs_info->sectorsize; | |
2554 | spin_lock(&sctx->stat_lock); | |
2555 | sctx->stat.data_extents_scrubbed++; | |
2556 | sctx->stat.data_bytes_scrubbed += len; | |
2557 | spin_unlock(&sctx->stat_lock); | |
2558 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
2559 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) | |
2560 | blocksize = map->stripe_len; | |
2561 | else | |
2562 | blocksize = sctx->fs_info->nodesize; | |
2563 | spin_lock(&sctx->stat_lock); | |
2564 | sctx->stat.tree_extents_scrubbed++; | |
2565 | sctx->stat.tree_bytes_scrubbed += len; | |
2566 | spin_unlock(&sctx->stat_lock); | |
2567 | } else { | |
2568 | blocksize = sctx->fs_info->sectorsize; | |
2569 | WARN_ON(1); | |
2570 | } | |
2571 | ||
2572 | while (len) { | |
2573 | u32 l = min(len, blocksize); | |
2574 | int have_csum = 0; | |
2575 | ||
2576 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2577 | /* push csums to sbio */ | |
2578 | have_csum = scrub_find_csum(sctx, logical, csum); | |
2579 | if (have_csum == 0) | |
2580 | ++sctx->stat.no_csum; | |
2581 | } | |
2582 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, | |
2583 | mirror_num, have_csum ? csum : NULL, | |
2584 | physical_for_dev_replace); | |
2585 | if (ret) | |
2586 | return ret; | |
2587 | len -= l; | |
2588 | logical += l; | |
2589 | physical += l; | |
2590 | physical_for_dev_replace += l; | |
2591 | } | |
2592 | return 0; | |
2593 | } | |
2594 | ||
2595 | static int scrub_pages_for_parity(struct scrub_parity *sparity, | |
2596 | u64 logical, u32 len, | |
2597 | u64 physical, struct btrfs_device *dev, | |
2598 | u64 flags, u64 gen, int mirror_num, u8 *csum) | |
2599 | { | |
2600 | struct scrub_ctx *sctx = sparity->sctx; | |
2601 | struct scrub_block *sblock; | |
2602 | const u32 sectorsize = sctx->fs_info->sectorsize; | |
2603 | int index; | |
2604 | ||
2605 | ASSERT(IS_ALIGNED(len, sectorsize)); | |
2606 | ||
2607 | sblock = kzalloc(sizeof(*sblock), GFP_KERNEL); | |
2608 | if (!sblock) { | |
2609 | spin_lock(&sctx->stat_lock); | |
2610 | sctx->stat.malloc_errors++; | |
2611 | spin_unlock(&sctx->stat_lock); | |
2612 | return -ENOMEM; | |
2613 | } | |
2614 | ||
2615 | /* one ref inside this function, plus one for each page added to | |
2616 | * a bio later on */ | |
2617 | refcount_set(&sblock->refs, 1); | |
2618 | sblock->sctx = sctx; | |
2619 | sblock->no_io_error_seen = 1; | |
2620 | sblock->sparity = sparity; | |
2621 | scrub_parity_get(sparity); | |
2622 | ||
2623 | for (index = 0; len > 0; index++) { | |
2624 | struct scrub_page *spage; | |
2625 | ||
2626 | spage = kzalloc(sizeof(*spage), GFP_KERNEL); | |
2627 | if (!spage) { | |
2628 | leave_nomem: | |
2629 | spin_lock(&sctx->stat_lock); | |
2630 | sctx->stat.malloc_errors++; | |
2631 | spin_unlock(&sctx->stat_lock); | |
2632 | scrub_block_put(sblock); | |
2633 | return -ENOMEM; | |
2634 | } | |
2635 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); | |
2636 | /* For scrub block */ | |
2637 | scrub_page_get(spage); | |
2638 | sblock->pagev[index] = spage; | |
2639 | /* For scrub parity */ | |
2640 | scrub_page_get(spage); | |
2641 | list_add_tail(&spage->list, &sparity->spages); | |
2642 | spage->sblock = sblock; | |
2643 | spage->dev = dev; | |
2644 | spage->flags = flags; | |
2645 | spage->generation = gen; | |
2646 | spage->logical = logical; | |
2647 | spage->physical = physical; | |
2648 | spage->mirror_num = mirror_num; | |
2649 | if (csum) { | |
2650 | spage->have_csum = 1; | |
2651 | memcpy(spage->csum, csum, sctx->fs_info->csum_size); | |
2652 | } else { | |
2653 | spage->have_csum = 0; | |
2654 | } | |
2655 | sblock->page_count++; | |
2656 | spage->page = alloc_page(GFP_KERNEL); | |
2657 | if (!spage->page) | |
2658 | goto leave_nomem; | |
2659 | ||
2660 | ||
2661 | /* Iterate over the stripe range in sectorsize steps */ | |
2662 | len -= sectorsize; | |
2663 | logical += sectorsize; | |
2664 | physical += sectorsize; | |
2665 | } | |
2666 | ||
2667 | WARN_ON(sblock->page_count == 0); | |
2668 | for (index = 0; index < sblock->page_count; index++) { | |
2669 | struct scrub_page *spage = sblock->pagev[index]; | |
2670 | int ret; | |
2671 | ||
2672 | ret = scrub_add_page_to_rd_bio(sctx, spage); | |
2673 | if (ret) { | |
2674 | scrub_block_put(sblock); | |
2675 | return ret; | |
2676 | } | |
2677 | } | |
2678 | ||
2679 | /* last one frees, either here or in bio completion for last page */ | |
2680 | scrub_block_put(sblock); | |
2681 | return 0; | |
2682 | } | |
2683 | ||
2684 | static int scrub_extent_for_parity(struct scrub_parity *sparity, | |
2685 | u64 logical, u32 len, | |
2686 | u64 physical, struct btrfs_device *dev, | |
2687 | u64 flags, u64 gen, int mirror_num) | |
2688 | { | |
2689 | struct scrub_ctx *sctx = sparity->sctx; | |
2690 | int ret; | |
2691 | u8 csum[BTRFS_CSUM_SIZE]; | |
2692 | u32 blocksize; | |
2693 | ||
2694 | if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) { | |
2695 | scrub_parity_mark_sectors_error(sparity, logical, len); | |
2696 | return 0; | |
2697 | } | |
2698 | ||
2699 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2700 | blocksize = sparity->stripe_len; | |
2701 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
2702 | blocksize = sparity->stripe_len; | |
2703 | } else { | |
2704 | blocksize = sctx->fs_info->sectorsize; | |
2705 | WARN_ON(1); | |
2706 | } | |
2707 | ||
2708 | while (len) { | |
2709 | u32 l = min(len, blocksize); | |
2710 | int have_csum = 0; | |
2711 | ||
2712 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2713 | /* push csums to sbio */ | |
2714 | have_csum = scrub_find_csum(sctx, logical, csum); | |
2715 | if (have_csum == 0) | |
2716 | goto skip; | |
2717 | } | |
2718 | ret = scrub_pages_for_parity(sparity, logical, l, physical, dev, | |
2719 | flags, gen, mirror_num, | |
2720 | have_csum ? csum : NULL); | |
2721 | if (ret) | |
2722 | return ret; | |
2723 | skip: | |
2724 | len -= l; | |
2725 | logical += l; | |
2726 | physical += l; | |
2727 | } | |
2728 | return 0; | |
2729 | } | |
2730 | ||
2731 | /* | |
2732 | * Given a physical address, this will calculate it's | |
2733 | * logical offset. if this is a parity stripe, it will return | |
2734 | * the most left data stripe's logical offset. | |
2735 | * | |
2736 | * return 0 if it is a data stripe, 1 means parity stripe. | |
2737 | */ | |
2738 | static int get_raid56_logic_offset(u64 physical, int num, | |
2739 | struct map_lookup *map, u64 *offset, | |
2740 | u64 *stripe_start) | |
2741 | { | |
2742 | int i; | |
2743 | int j = 0; | |
2744 | u64 stripe_nr; | |
2745 | u64 last_offset; | |
2746 | u32 stripe_index; | |
2747 | u32 rot; | |
2748 | const int data_stripes = nr_data_stripes(map); | |
2749 | ||
2750 | last_offset = (physical - map->stripes[num].physical) * data_stripes; | |
2751 | if (stripe_start) | |
2752 | *stripe_start = last_offset; | |
2753 | ||
2754 | *offset = last_offset; | |
2755 | for (i = 0; i < data_stripes; i++) { | |
2756 | *offset = last_offset + i * map->stripe_len; | |
2757 | ||
2758 | stripe_nr = div64_u64(*offset, map->stripe_len); | |
2759 | stripe_nr = div_u64(stripe_nr, data_stripes); | |
2760 | ||
2761 | /* Work out the disk rotation on this stripe-set */ | |
2762 | stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot); | |
2763 | /* calculate which stripe this data locates */ | |
2764 | rot += i; | |
2765 | stripe_index = rot % map->num_stripes; | |
2766 | if (stripe_index == num) | |
2767 | return 0; | |
2768 | if (stripe_index < num) | |
2769 | j++; | |
2770 | } | |
2771 | *offset = last_offset + j * map->stripe_len; | |
2772 | return 1; | |
2773 | } | |
2774 | ||
2775 | static void scrub_free_parity(struct scrub_parity *sparity) | |
2776 | { | |
2777 | struct scrub_ctx *sctx = sparity->sctx; | |
2778 | struct scrub_page *curr, *next; | |
2779 | int nbits; | |
2780 | ||
2781 | nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors); | |
2782 | if (nbits) { | |
2783 | spin_lock(&sctx->stat_lock); | |
2784 | sctx->stat.read_errors += nbits; | |
2785 | sctx->stat.uncorrectable_errors += nbits; | |
2786 | spin_unlock(&sctx->stat_lock); | |
2787 | } | |
2788 | ||
2789 | list_for_each_entry_safe(curr, next, &sparity->spages, list) { | |
2790 | list_del_init(&curr->list); | |
2791 | scrub_page_put(curr); | |
2792 | } | |
2793 | ||
2794 | kfree(sparity); | |
2795 | } | |
2796 | ||
2797 | static void scrub_parity_bio_endio_worker(struct btrfs_work *work) | |
2798 | { | |
2799 | struct scrub_parity *sparity = container_of(work, struct scrub_parity, | |
2800 | work); | |
2801 | struct scrub_ctx *sctx = sparity->sctx; | |
2802 | ||
2803 | scrub_free_parity(sparity); | |
2804 | scrub_pending_bio_dec(sctx); | |
2805 | } | |
2806 | ||
2807 | static void scrub_parity_bio_endio(struct bio *bio) | |
2808 | { | |
2809 | struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private; | |
2810 | struct btrfs_fs_info *fs_info = sparity->sctx->fs_info; | |
2811 | ||
2812 | if (bio->bi_status) | |
2813 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, | |
2814 | sparity->nsectors); | |
2815 | ||
2816 | bio_put(bio); | |
2817 | ||
2818 | btrfs_init_work(&sparity->work, scrub_parity_bio_endio_worker, NULL, | |
2819 | NULL); | |
2820 | btrfs_queue_work(fs_info->scrub_parity_workers, &sparity->work); | |
2821 | } | |
2822 | ||
2823 | static void scrub_parity_check_and_repair(struct scrub_parity *sparity) | |
2824 | { | |
2825 | struct scrub_ctx *sctx = sparity->sctx; | |
2826 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
2827 | struct bio *bio; | |
2828 | struct btrfs_raid_bio *rbio; | |
2829 | struct btrfs_bio *bbio = NULL; | |
2830 | u64 length; | |
2831 | int ret; | |
2832 | ||
2833 | if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap, | |
2834 | sparity->nsectors)) | |
2835 | goto out; | |
2836 | ||
2837 | length = sparity->logic_end - sparity->logic_start; | |
2838 | ||
2839 | btrfs_bio_counter_inc_blocked(fs_info); | |
2840 | ret = btrfs_map_sblock(fs_info, BTRFS_MAP_WRITE, sparity->logic_start, | |
2841 | &length, &bbio); | |
2842 | if (ret || !bbio || !bbio->raid_map) | |
2843 | goto bbio_out; | |
2844 | ||
2845 | bio = btrfs_io_bio_alloc(0); | |
2846 | bio->bi_iter.bi_sector = sparity->logic_start >> 9; | |
2847 | bio->bi_private = sparity; | |
2848 | bio->bi_end_io = scrub_parity_bio_endio; | |
2849 | ||
2850 | rbio = raid56_parity_alloc_scrub_rbio(fs_info, bio, bbio, | |
2851 | length, sparity->scrub_dev, | |
2852 | sparity->dbitmap, | |
2853 | sparity->nsectors); | |
2854 | if (!rbio) | |
2855 | goto rbio_out; | |
2856 | ||
2857 | scrub_pending_bio_inc(sctx); | |
2858 | raid56_parity_submit_scrub_rbio(rbio); | |
2859 | return; | |
2860 | ||
2861 | rbio_out: | |
2862 | bio_put(bio); | |
2863 | bbio_out: | |
2864 | btrfs_bio_counter_dec(fs_info); | |
2865 | btrfs_put_bbio(bbio); | |
2866 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, | |
2867 | sparity->nsectors); | |
2868 | spin_lock(&sctx->stat_lock); | |
2869 | sctx->stat.malloc_errors++; | |
2870 | spin_unlock(&sctx->stat_lock); | |
2871 | out: | |
2872 | scrub_free_parity(sparity); | |
2873 | } | |
2874 | ||
2875 | static inline int scrub_calc_parity_bitmap_len(int nsectors) | |
2876 | { | |
2877 | return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * sizeof(long); | |
2878 | } | |
2879 | ||
2880 | static void scrub_parity_get(struct scrub_parity *sparity) | |
2881 | { | |
2882 | refcount_inc(&sparity->refs); | |
2883 | } | |
2884 | ||
2885 | static void scrub_parity_put(struct scrub_parity *sparity) | |
2886 | { | |
2887 | if (!refcount_dec_and_test(&sparity->refs)) | |
2888 | return; | |
2889 | ||
2890 | scrub_parity_check_and_repair(sparity); | |
2891 | } | |
2892 | ||
2893 | static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, | |
2894 | struct map_lookup *map, | |
2895 | struct btrfs_device *sdev, | |
2896 | struct btrfs_path *path, | |
2897 | u64 logic_start, | |
2898 | u64 logic_end) | |
2899 | { | |
2900 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
2901 | struct btrfs_root *root = fs_info->extent_root; | |
2902 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2903 | struct btrfs_extent_item *extent; | |
2904 | struct btrfs_bio *bbio = NULL; | |
2905 | u64 flags; | |
2906 | int ret; | |
2907 | int slot; | |
2908 | struct extent_buffer *l; | |
2909 | struct btrfs_key key; | |
2910 | u64 generation; | |
2911 | u64 extent_logical; | |
2912 | u64 extent_physical; | |
2913 | /* Check the comment in scrub_stripe() for why u32 is enough here */ | |
2914 | u32 extent_len; | |
2915 | u64 mapped_length; | |
2916 | struct btrfs_device *extent_dev; | |
2917 | struct scrub_parity *sparity; | |
2918 | int nsectors; | |
2919 | int bitmap_len; | |
2920 | int extent_mirror_num; | |
2921 | int stop_loop = 0; | |
2922 | ||
2923 | ASSERT(map->stripe_len <= U32_MAX); | |
2924 | nsectors = map->stripe_len >> fs_info->sectorsize_bits; | |
2925 | bitmap_len = scrub_calc_parity_bitmap_len(nsectors); | |
2926 | sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len, | |
2927 | GFP_NOFS); | |
2928 | if (!sparity) { | |
2929 | spin_lock(&sctx->stat_lock); | |
2930 | sctx->stat.malloc_errors++; | |
2931 | spin_unlock(&sctx->stat_lock); | |
2932 | return -ENOMEM; | |
2933 | } | |
2934 | ||
2935 | ASSERT(map->stripe_len <= U32_MAX); | |
2936 | sparity->stripe_len = map->stripe_len; | |
2937 | sparity->nsectors = nsectors; | |
2938 | sparity->sctx = sctx; | |
2939 | sparity->scrub_dev = sdev; | |
2940 | sparity->logic_start = logic_start; | |
2941 | sparity->logic_end = logic_end; | |
2942 | refcount_set(&sparity->refs, 1); | |
2943 | INIT_LIST_HEAD(&sparity->spages); | |
2944 | sparity->dbitmap = sparity->bitmap; | |
2945 | sparity->ebitmap = (void *)sparity->bitmap + bitmap_len; | |
2946 | ||
2947 | ret = 0; | |
2948 | while (logic_start < logic_end) { | |
2949 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) | |
2950 | key.type = BTRFS_METADATA_ITEM_KEY; | |
2951 | else | |
2952 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2953 | key.objectid = logic_start; | |
2954 | key.offset = (u64)-1; | |
2955 | ||
2956 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2957 | if (ret < 0) | |
2958 | goto out; | |
2959 | ||
2960 | if (ret > 0) { | |
2961 | ret = btrfs_previous_extent_item(root, path, 0); | |
2962 | if (ret < 0) | |
2963 | goto out; | |
2964 | if (ret > 0) { | |
2965 | btrfs_release_path(path); | |
2966 | ret = btrfs_search_slot(NULL, root, &key, | |
2967 | path, 0, 0); | |
2968 | if (ret < 0) | |
2969 | goto out; | |
2970 | } | |
2971 | } | |
2972 | ||
2973 | stop_loop = 0; | |
2974 | while (1) { | |
2975 | u64 bytes; | |
2976 | ||
2977 | l = path->nodes[0]; | |
2978 | slot = path->slots[0]; | |
2979 | if (slot >= btrfs_header_nritems(l)) { | |
2980 | ret = btrfs_next_leaf(root, path); | |
2981 | if (ret == 0) | |
2982 | continue; | |
2983 | if (ret < 0) | |
2984 | goto out; | |
2985 | ||
2986 | stop_loop = 1; | |
2987 | break; | |
2988 | } | |
2989 | btrfs_item_key_to_cpu(l, &key, slot); | |
2990 | ||
2991 | if (key.type != BTRFS_EXTENT_ITEM_KEY && | |
2992 | key.type != BTRFS_METADATA_ITEM_KEY) | |
2993 | goto next; | |
2994 | ||
2995 | if (key.type == BTRFS_METADATA_ITEM_KEY) | |
2996 | bytes = fs_info->nodesize; | |
2997 | else | |
2998 | bytes = key.offset; | |
2999 | ||
3000 | if (key.objectid + bytes <= logic_start) | |
3001 | goto next; | |
3002 | ||
3003 | if (key.objectid >= logic_end) { | |
3004 | stop_loop = 1; | |
3005 | break; | |
3006 | } | |
3007 | ||
3008 | while (key.objectid >= logic_start + map->stripe_len) | |
3009 | logic_start += map->stripe_len; | |
3010 | ||
3011 | extent = btrfs_item_ptr(l, slot, | |
3012 | struct btrfs_extent_item); | |
3013 | flags = btrfs_extent_flags(l, extent); | |
3014 | generation = btrfs_extent_generation(l, extent); | |
3015 | ||
3016 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && | |
3017 | (key.objectid < logic_start || | |
3018 | key.objectid + bytes > | |
3019 | logic_start + map->stripe_len)) { | |
3020 | btrfs_err(fs_info, | |
3021 | "scrub: tree block %llu spanning stripes, ignored. logical=%llu", | |
3022 | key.objectid, logic_start); | |
3023 | spin_lock(&sctx->stat_lock); | |
3024 | sctx->stat.uncorrectable_errors++; | |
3025 | spin_unlock(&sctx->stat_lock); | |
3026 | goto next; | |
3027 | } | |
3028 | again: | |
3029 | extent_logical = key.objectid; | |
3030 | ASSERT(bytes <= U32_MAX); | |
3031 | extent_len = bytes; | |
3032 | ||
3033 | if (extent_logical < logic_start) { | |
3034 | extent_len -= logic_start - extent_logical; | |
3035 | extent_logical = logic_start; | |
3036 | } | |
3037 | ||
3038 | if (extent_logical + extent_len > | |
3039 | logic_start + map->stripe_len) | |
3040 | extent_len = logic_start + map->stripe_len - | |
3041 | extent_logical; | |
3042 | ||
3043 | scrub_parity_mark_sectors_data(sparity, extent_logical, | |
3044 | extent_len); | |
3045 | ||
3046 | mapped_length = extent_len; | |
3047 | bbio = NULL; | |
3048 | ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, | |
3049 | extent_logical, &mapped_length, &bbio, | |
3050 | 0); | |
3051 | if (!ret) { | |
3052 | if (!bbio || mapped_length < extent_len) | |
3053 | ret = -EIO; | |
3054 | } | |
3055 | if (ret) { | |
3056 | btrfs_put_bbio(bbio); | |
3057 | goto out; | |
3058 | } | |
3059 | extent_physical = bbio->stripes[0].physical; | |
3060 | extent_mirror_num = bbio->mirror_num; | |
3061 | extent_dev = bbio->stripes[0].dev; | |
3062 | btrfs_put_bbio(bbio); | |
3063 | ||
3064 | ret = btrfs_lookup_csums_range(csum_root, | |
3065 | extent_logical, | |
3066 | extent_logical + extent_len - 1, | |
3067 | &sctx->csum_list, 1); | |
3068 | if (ret) | |
3069 | goto out; | |
3070 | ||
3071 | ret = scrub_extent_for_parity(sparity, extent_logical, | |
3072 | extent_len, | |
3073 | extent_physical, | |
3074 | extent_dev, flags, | |
3075 | generation, | |
3076 | extent_mirror_num); | |
3077 | ||
3078 | scrub_free_csums(sctx); | |
3079 | ||
3080 | if (ret) | |
3081 | goto out; | |
3082 | ||
3083 | if (extent_logical + extent_len < | |
3084 | key.objectid + bytes) { | |
3085 | logic_start += map->stripe_len; | |
3086 | ||
3087 | if (logic_start >= logic_end) { | |
3088 | stop_loop = 1; | |
3089 | break; | |
3090 | } | |
3091 | ||
3092 | if (logic_start < key.objectid + bytes) { | |
3093 | cond_resched(); | |
3094 | goto again; | |
3095 | } | |
3096 | } | |
3097 | next: | |
3098 | path->slots[0]++; | |
3099 | } | |
3100 | ||
3101 | btrfs_release_path(path); | |
3102 | ||
3103 | if (stop_loop) | |
3104 | break; | |
3105 | ||
3106 | logic_start += map->stripe_len; | |
3107 | } | |
3108 | out: | |
3109 | if (ret < 0) { | |
3110 | ASSERT(logic_end - logic_start <= U32_MAX); | |
3111 | scrub_parity_mark_sectors_error(sparity, logic_start, | |
3112 | logic_end - logic_start); | |
3113 | } | |
3114 | scrub_parity_put(sparity); | |
3115 | scrub_submit(sctx); | |
3116 | mutex_lock(&sctx->wr_lock); | |
3117 | scrub_wr_submit(sctx); | |
3118 | mutex_unlock(&sctx->wr_lock); | |
3119 | ||
3120 | btrfs_release_path(path); | |
3121 | return ret < 0 ? ret : 0; | |
3122 | } | |
3123 | ||
3124 | static void sync_replace_for_zoned(struct scrub_ctx *sctx) | |
3125 | { | |
3126 | if (!btrfs_is_zoned(sctx->fs_info)) | |
3127 | return; | |
3128 | ||
3129 | sctx->flush_all_writes = true; | |
3130 | scrub_submit(sctx); | |
3131 | mutex_lock(&sctx->wr_lock); | |
3132 | scrub_wr_submit(sctx); | |
3133 | mutex_unlock(&sctx->wr_lock); | |
3134 | ||
3135 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); | |
3136 | } | |
3137 | ||
3138 | static int sync_write_pointer_for_zoned(struct scrub_ctx *sctx, u64 logical, | |
3139 | u64 physical, u64 physical_end) | |
3140 | { | |
3141 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
3142 | int ret = 0; | |
3143 | ||
3144 | if (!btrfs_is_zoned(fs_info)) | |
3145 | return 0; | |
3146 | ||
3147 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); | |
3148 | ||
3149 | mutex_lock(&sctx->wr_lock); | |
3150 | if (sctx->write_pointer < physical_end) { | |
3151 | ret = btrfs_sync_zone_write_pointer(sctx->wr_tgtdev, logical, | |
3152 | physical, | |
3153 | sctx->write_pointer); | |
3154 | if (ret) | |
3155 | btrfs_err(fs_info, | |
3156 | "zoned: failed to recover write pointer"); | |
3157 | } | |
3158 | mutex_unlock(&sctx->wr_lock); | |
3159 | btrfs_dev_clear_zone_empty(sctx->wr_tgtdev, physical); | |
3160 | ||
3161 | return ret; | |
3162 | } | |
3163 | ||
3164 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, | |
3165 | struct map_lookup *map, | |
3166 | struct btrfs_device *scrub_dev, | |
3167 | int num, u64 base, u64 length, | |
3168 | struct btrfs_block_group *cache) | |
3169 | { | |
3170 | struct btrfs_path *path, *ppath; | |
3171 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
3172 | struct btrfs_root *root = fs_info->extent_root; | |
3173 | struct btrfs_root *csum_root = fs_info->csum_root; | |
3174 | struct btrfs_extent_item *extent; | |
3175 | struct blk_plug plug; | |
3176 | u64 flags; | |
3177 | int ret; | |
3178 | int slot; | |
3179 | u64 nstripes; | |
3180 | struct extent_buffer *l; | |
3181 | u64 physical; | |
3182 | u64 logical; | |
3183 | u64 logic_end; | |
3184 | u64 physical_end; | |
3185 | u64 generation; | |
3186 | int mirror_num; | |
3187 | struct reada_control *reada1; | |
3188 | struct reada_control *reada2; | |
3189 | struct btrfs_key key; | |
3190 | struct btrfs_key key_end; | |
3191 | u64 increment = map->stripe_len; | |
3192 | u64 offset; | |
3193 | u64 extent_logical; | |
3194 | u64 extent_physical; | |
3195 | /* | |
3196 | * Unlike chunk length, extent length should never go beyond | |
3197 | * BTRFS_MAX_EXTENT_SIZE, thus u32 is enough here. | |
3198 | */ | |
3199 | u32 extent_len; | |
3200 | u64 stripe_logical; | |
3201 | u64 stripe_end; | |
3202 | struct btrfs_device *extent_dev; | |
3203 | int extent_mirror_num; | |
3204 | int stop_loop = 0; | |
3205 | ||
3206 | physical = map->stripes[num].physical; | |
3207 | offset = 0; | |
3208 | nstripes = div64_u64(length, map->stripe_len); | |
3209 | mirror_num = 1; | |
3210 | increment = map->stripe_len; | |
3211 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3212 | offset = map->stripe_len * num; | |
3213 | increment = map->stripe_len * map->num_stripes; | |
3214 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
3215 | int factor = map->num_stripes / map->sub_stripes; | |
3216 | offset = map->stripe_len * (num / map->sub_stripes); | |
3217 | increment = map->stripe_len * factor; | |
3218 | mirror_num = num % map->sub_stripes + 1; | |
3219 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1_MASK) { | |
3220 | mirror_num = num % map->num_stripes + 1; | |
3221 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { | |
3222 | mirror_num = num % map->num_stripes + 1; | |
3223 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { | |
3224 | get_raid56_logic_offset(physical, num, map, &offset, NULL); | |
3225 | increment = map->stripe_len * nr_data_stripes(map); | |
3226 | } | |
3227 | ||
3228 | path = btrfs_alloc_path(); | |
3229 | if (!path) | |
3230 | return -ENOMEM; | |
3231 | ||
3232 | ppath = btrfs_alloc_path(); | |
3233 | if (!ppath) { | |
3234 | btrfs_free_path(path); | |
3235 | return -ENOMEM; | |
3236 | } | |
3237 | ||
3238 | /* | |
3239 | * work on commit root. The related disk blocks are static as | |
3240 | * long as COW is applied. This means, it is save to rewrite | |
3241 | * them to repair disk errors without any race conditions | |
3242 | */ | |
3243 | path->search_commit_root = 1; | |
3244 | path->skip_locking = 1; | |
3245 | ||
3246 | ppath->search_commit_root = 1; | |
3247 | ppath->skip_locking = 1; | |
3248 | /* | |
3249 | * trigger the readahead for extent tree csum tree and wait for | |
3250 | * completion. During readahead, the scrub is officially paused | |
3251 | * to not hold off transaction commits | |
3252 | */ | |
3253 | logical = base + offset; | |
3254 | physical_end = physical + nstripes * map->stripe_len; | |
3255 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { | |
3256 | get_raid56_logic_offset(physical_end, num, | |
3257 | map, &logic_end, NULL); | |
3258 | logic_end += base; | |
3259 | } else { | |
3260 | logic_end = logical + increment * nstripes; | |
3261 | } | |
3262 | wait_event(sctx->list_wait, | |
3263 | atomic_read(&sctx->bios_in_flight) == 0); | |
3264 | scrub_blocked_if_needed(fs_info); | |
3265 | ||
3266 | /* FIXME it might be better to start readahead at commit root */ | |
3267 | key.objectid = logical; | |
3268 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
3269 | key.offset = (u64)0; | |
3270 | key_end.objectid = logic_end; | |
3271 | key_end.type = BTRFS_METADATA_ITEM_KEY; | |
3272 | key_end.offset = (u64)-1; | |
3273 | reada1 = btrfs_reada_add(root, &key, &key_end); | |
3274 | ||
3275 | if (cache->flags & BTRFS_BLOCK_GROUP_DATA) { | |
3276 | key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
3277 | key.type = BTRFS_EXTENT_CSUM_KEY; | |
3278 | key.offset = logical; | |
3279 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
3280 | key_end.type = BTRFS_EXTENT_CSUM_KEY; | |
3281 | key_end.offset = logic_end; | |
3282 | reada2 = btrfs_reada_add(csum_root, &key, &key_end); | |
3283 | } else { | |
3284 | reada2 = NULL; | |
3285 | } | |
3286 | ||
3287 | if (!IS_ERR(reada1)) | |
3288 | btrfs_reada_wait(reada1); | |
3289 | if (!IS_ERR_OR_NULL(reada2)) | |
3290 | btrfs_reada_wait(reada2); | |
3291 | ||
3292 | ||
3293 | /* | |
3294 | * collect all data csums for the stripe to avoid seeking during | |
3295 | * the scrub. This might currently (crc32) end up to be about 1MB | |
3296 | */ | |
3297 | blk_start_plug(&plug); | |
3298 | ||
3299 | if (sctx->is_dev_replace && | |
3300 | btrfs_dev_is_sequential(sctx->wr_tgtdev, physical)) { | |
3301 | mutex_lock(&sctx->wr_lock); | |
3302 | sctx->write_pointer = physical; | |
3303 | mutex_unlock(&sctx->wr_lock); | |
3304 | sctx->flush_all_writes = true; | |
3305 | } | |
3306 | ||
3307 | /* | |
3308 | * now find all extents for each stripe and scrub them | |
3309 | */ | |
3310 | ret = 0; | |
3311 | while (physical < physical_end) { | |
3312 | /* | |
3313 | * canceled? | |
3314 | */ | |
3315 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
3316 | atomic_read(&sctx->cancel_req)) { | |
3317 | ret = -ECANCELED; | |
3318 | goto out; | |
3319 | } | |
3320 | /* | |
3321 | * check to see if we have to pause | |
3322 | */ | |
3323 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
3324 | /* push queued extents */ | |
3325 | sctx->flush_all_writes = true; | |
3326 | scrub_submit(sctx); | |
3327 | mutex_lock(&sctx->wr_lock); | |
3328 | scrub_wr_submit(sctx); | |
3329 | mutex_unlock(&sctx->wr_lock); | |
3330 | wait_event(sctx->list_wait, | |
3331 | atomic_read(&sctx->bios_in_flight) == 0); | |
3332 | sctx->flush_all_writes = false; | |
3333 | scrub_blocked_if_needed(fs_info); | |
3334 | } | |
3335 | ||
3336 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { | |
3337 | ret = get_raid56_logic_offset(physical, num, map, | |
3338 | &logical, | |
3339 | &stripe_logical); | |
3340 | logical += base; | |
3341 | if (ret) { | |
3342 | /* it is parity strip */ | |
3343 | stripe_logical += base; | |
3344 | stripe_end = stripe_logical + increment; | |
3345 | ret = scrub_raid56_parity(sctx, map, scrub_dev, | |
3346 | ppath, stripe_logical, | |
3347 | stripe_end); | |
3348 | if (ret) | |
3349 | goto out; | |
3350 | goto skip; | |
3351 | } | |
3352 | } | |
3353 | ||
3354 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) | |
3355 | key.type = BTRFS_METADATA_ITEM_KEY; | |
3356 | else | |
3357 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
3358 | key.objectid = logical; | |
3359 | key.offset = (u64)-1; | |
3360 | ||
3361 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3362 | if (ret < 0) | |
3363 | goto out; | |
3364 | ||
3365 | if (ret > 0) { | |
3366 | ret = btrfs_previous_extent_item(root, path, 0); | |
3367 | if (ret < 0) | |
3368 | goto out; | |
3369 | if (ret > 0) { | |
3370 | /* there's no smaller item, so stick with the | |
3371 | * larger one */ | |
3372 | btrfs_release_path(path); | |
3373 | ret = btrfs_search_slot(NULL, root, &key, | |
3374 | path, 0, 0); | |
3375 | if (ret < 0) | |
3376 | goto out; | |
3377 | } | |
3378 | } | |
3379 | ||
3380 | stop_loop = 0; | |
3381 | while (1) { | |
3382 | u64 bytes; | |
3383 | ||
3384 | l = path->nodes[0]; | |
3385 | slot = path->slots[0]; | |
3386 | if (slot >= btrfs_header_nritems(l)) { | |
3387 | ret = btrfs_next_leaf(root, path); | |
3388 | if (ret == 0) | |
3389 | continue; | |
3390 | if (ret < 0) | |
3391 | goto out; | |
3392 | ||
3393 | stop_loop = 1; | |
3394 | break; | |
3395 | } | |
3396 | btrfs_item_key_to_cpu(l, &key, slot); | |
3397 | ||
3398 | if (key.type != BTRFS_EXTENT_ITEM_KEY && | |
3399 | key.type != BTRFS_METADATA_ITEM_KEY) | |
3400 | goto next; | |
3401 | ||
3402 | if (key.type == BTRFS_METADATA_ITEM_KEY) | |
3403 | bytes = fs_info->nodesize; | |
3404 | else | |
3405 | bytes = key.offset; | |
3406 | ||
3407 | if (key.objectid + bytes <= logical) | |
3408 | goto next; | |
3409 | ||
3410 | if (key.objectid >= logical + map->stripe_len) { | |
3411 | /* out of this device extent */ | |
3412 | if (key.objectid >= logic_end) | |
3413 | stop_loop = 1; | |
3414 | break; | |
3415 | } | |
3416 | ||
3417 | /* | |
3418 | * If our block group was removed in the meanwhile, just | |
3419 | * stop scrubbing since there is no point in continuing. | |
3420 | * Continuing would prevent reusing its device extents | |
3421 | * for new block groups for a long time. | |
3422 | */ | |
3423 | spin_lock(&cache->lock); | |
3424 | if (cache->removed) { | |
3425 | spin_unlock(&cache->lock); | |
3426 | ret = 0; | |
3427 | goto out; | |
3428 | } | |
3429 | spin_unlock(&cache->lock); | |
3430 | ||
3431 | extent = btrfs_item_ptr(l, slot, | |
3432 | struct btrfs_extent_item); | |
3433 | flags = btrfs_extent_flags(l, extent); | |
3434 | generation = btrfs_extent_generation(l, extent); | |
3435 | ||
3436 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && | |
3437 | (key.objectid < logical || | |
3438 | key.objectid + bytes > | |
3439 | logical + map->stripe_len)) { | |
3440 | btrfs_err(fs_info, | |
3441 | "scrub: tree block %llu spanning stripes, ignored. logical=%llu", | |
3442 | key.objectid, logical); | |
3443 | spin_lock(&sctx->stat_lock); | |
3444 | sctx->stat.uncorrectable_errors++; | |
3445 | spin_unlock(&sctx->stat_lock); | |
3446 | goto next; | |
3447 | } | |
3448 | ||
3449 | again: | |
3450 | extent_logical = key.objectid; | |
3451 | ASSERT(bytes <= U32_MAX); | |
3452 | extent_len = bytes; | |
3453 | ||
3454 | /* | |
3455 | * trim extent to this stripe | |
3456 | */ | |
3457 | if (extent_logical < logical) { | |
3458 | extent_len -= logical - extent_logical; | |
3459 | extent_logical = logical; | |
3460 | } | |
3461 | if (extent_logical + extent_len > | |
3462 | logical + map->stripe_len) { | |
3463 | extent_len = logical + map->stripe_len - | |
3464 | extent_logical; | |
3465 | } | |
3466 | ||
3467 | extent_physical = extent_logical - logical + physical; | |
3468 | extent_dev = scrub_dev; | |
3469 | extent_mirror_num = mirror_num; | |
3470 | if (sctx->is_dev_replace) | |
3471 | scrub_remap_extent(fs_info, extent_logical, | |
3472 | extent_len, &extent_physical, | |
3473 | &extent_dev, | |
3474 | &extent_mirror_num); | |
3475 | ||
3476 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
3477 | ret = btrfs_lookup_csums_range(csum_root, | |
3478 | extent_logical, | |
3479 | extent_logical + extent_len - 1, | |
3480 | &sctx->csum_list, 1); | |
3481 | if (ret) | |
3482 | goto out; | |
3483 | } | |
3484 | ||
3485 | ret = scrub_extent(sctx, map, extent_logical, extent_len, | |
3486 | extent_physical, extent_dev, flags, | |
3487 | generation, extent_mirror_num, | |
3488 | extent_logical - logical + physical); | |
3489 | ||
3490 | scrub_free_csums(sctx); | |
3491 | ||
3492 | if (ret) | |
3493 | goto out; | |
3494 | ||
3495 | if (sctx->is_dev_replace) | |
3496 | sync_replace_for_zoned(sctx); | |
3497 | ||
3498 | if (extent_logical + extent_len < | |
3499 | key.objectid + bytes) { | |
3500 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { | |
3501 | /* | |
3502 | * loop until we find next data stripe | |
3503 | * or we have finished all stripes. | |
3504 | */ | |
3505 | loop: | |
3506 | physical += map->stripe_len; | |
3507 | ret = get_raid56_logic_offset(physical, | |
3508 | num, map, &logical, | |
3509 | &stripe_logical); | |
3510 | logical += base; | |
3511 | ||
3512 | if (ret && physical < physical_end) { | |
3513 | stripe_logical += base; | |
3514 | stripe_end = stripe_logical + | |
3515 | increment; | |
3516 | ret = scrub_raid56_parity(sctx, | |
3517 | map, scrub_dev, ppath, | |
3518 | stripe_logical, | |
3519 | stripe_end); | |
3520 | if (ret) | |
3521 | goto out; | |
3522 | goto loop; | |
3523 | } | |
3524 | } else { | |
3525 | physical += map->stripe_len; | |
3526 | logical += increment; | |
3527 | } | |
3528 | if (logical < key.objectid + bytes) { | |
3529 | cond_resched(); | |
3530 | goto again; | |
3531 | } | |
3532 | ||
3533 | if (physical >= physical_end) { | |
3534 | stop_loop = 1; | |
3535 | break; | |
3536 | } | |
3537 | } | |
3538 | next: | |
3539 | path->slots[0]++; | |
3540 | } | |
3541 | btrfs_release_path(path); | |
3542 | skip: | |
3543 | logical += increment; | |
3544 | physical += map->stripe_len; | |
3545 | spin_lock(&sctx->stat_lock); | |
3546 | if (stop_loop) | |
3547 | sctx->stat.last_physical = map->stripes[num].physical + | |
3548 | length; | |
3549 | else | |
3550 | sctx->stat.last_physical = physical; | |
3551 | spin_unlock(&sctx->stat_lock); | |
3552 | if (stop_loop) | |
3553 | break; | |
3554 | } | |
3555 | out: | |
3556 | /* push queued extents */ | |
3557 | scrub_submit(sctx); | |
3558 | mutex_lock(&sctx->wr_lock); | |
3559 | scrub_wr_submit(sctx); | |
3560 | mutex_unlock(&sctx->wr_lock); | |
3561 | ||
3562 | blk_finish_plug(&plug); | |
3563 | btrfs_free_path(path); | |
3564 | btrfs_free_path(ppath); | |
3565 | ||
3566 | if (sctx->is_dev_replace && ret >= 0) { | |
3567 | int ret2; | |
3568 | ||
3569 | ret2 = sync_write_pointer_for_zoned(sctx, base + offset, | |
3570 | map->stripes[num].physical, | |
3571 | physical_end); | |
3572 | if (ret2) | |
3573 | ret = ret2; | |
3574 | } | |
3575 | ||
3576 | return ret < 0 ? ret : 0; | |
3577 | } | |
3578 | ||
3579 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, | |
3580 | struct btrfs_device *scrub_dev, | |
3581 | u64 chunk_offset, u64 length, | |
3582 | u64 dev_offset, | |
3583 | struct btrfs_block_group *cache) | |
3584 | { | |
3585 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
3586 | struct extent_map_tree *map_tree = &fs_info->mapping_tree; | |
3587 | struct map_lookup *map; | |
3588 | struct extent_map *em; | |
3589 | int i; | |
3590 | int ret = 0; | |
3591 | ||
3592 | read_lock(&map_tree->lock); | |
3593 | em = lookup_extent_mapping(map_tree, chunk_offset, 1); | |
3594 | read_unlock(&map_tree->lock); | |
3595 | ||
3596 | if (!em) { | |
3597 | /* | |
3598 | * Might have been an unused block group deleted by the cleaner | |
3599 | * kthread or relocation. | |
3600 | */ | |
3601 | spin_lock(&cache->lock); | |
3602 | if (!cache->removed) | |
3603 | ret = -EINVAL; | |
3604 | spin_unlock(&cache->lock); | |
3605 | ||
3606 | return ret; | |
3607 | } | |
3608 | ||
3609 | map = em->map_lookup; | |
3610 | if (em->start != chunk_offset) | |
3611 | goto out; | |
3612 | ||
3613 | if (em->len < length) | |
3614 | goto out; | |
3615 | ||
3616 | for (i = 0; i < map->num_stripes; ++i) { | |
3617 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && | |
3618 | map->stripes[i].physical == dev_offset) { | |
3619 | ret = scrub_stripe(sctx, map, scrub_dev, i, | |
3620 | chunk_offset, length, cache); | |
3621 | if (ret) | |
3622 | goto out; | |
3623 | } | |
3624 | } | |
3625 | out: | |
3626 | free_extent_map(em); | |
3627 | ||
3628 | return ret; | |
3629 | } | |
3630 | ||
3631 | static int finish_extent_writes_for_zoned(struct btrfs_root *root, | |
3632 | struct btrfs_block_group *cache) | |
3633 | { | |
3634 | struct btrfs_fs_info *fs_info = cache->fs_info; | |
3635 | struct btrfs_trans_handle *trans; | |
3636 | ||
3637 | if (!btrfs_is_zoned(fs_info)) | |
3638 | return 0; | |
3639 | ||
3640 | btrfs_wait_block_group_reservations(cache); | |
3641 | btrfs_wait_nocow_writers(cache); | |
3642 | btrfs_wait_ordered_roots(fs_info, U64_MAX, cache->start, cache->length); | |
3643 | ||
3644 | trans = btrfs_join_transaction(root); | |
3645 | if (IS_ERR(trans)) | |
3646 | return PTR_ERR(trans); | |
3647 | return btrfs_commit_transaction(trans); | |
3648 | } | |
3649 | ||
3650 | static noinline_for_stack | |
3651 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, | |
3652 | struct btrfs_device *scrub_dev, u64 start, u64 end) | |
3653 | { | |
3654 | struct btrfs_dev_extent *dev_extent = NULL; | |
3655 | struct btrfs_path *path; | |
3656 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
3657 | struct btrfs_root *root = fs_info->dev_root; | |
3658 | u64 length; | |
3659 | u64 chunk_offset; | |
3660 | int ret = 0; | |
3661 | int ro_set; | |
3662 | int slot; | |
3663 | struct extent_buffer *l; | |
3664 | struct btrfs_key key; | |
3665 | struct btrfs_key found_key; | |
3666 | struct btrfs_block_group *cache; | |
3667 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
3668 | ||
3669 | path = btrfs_alloc_path(); | |
3670 | if (!path) | |
3671 | return -ENOMEM; | |
3672 | ||
3673 | path->reada = READA_FORWARD; | |
3674 | path->search_commit_root = 1; | |
3675 | path->skip_locking = 1; | |
3676 | ||
3677 | key.objectid = scrub_dev->devid; | |
3678 | key.offset = 0ull; | |
3679 | key.type = BTRFS_DEV_EXTENT_KEY; | |
3680 | ||
3681 | while (1) { | |
3682 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3683 | if (ret < 0) | |
3684 | break; | |
3685 | if (ret > 0) { | |
3686 | if (path->slots[0] >= | |
3687 | btrfs_header_nritems(path->nodes[0])) { | |
3688 | ret = btrfs_next_leaf(root, path); | |
3689 | if (ret < 0) | |
3690 | break; | |
3691 | if (ret > 0) { | |
3692 | ret = 0; | |
3693 | break; | |
3694 | } | |
3695 | } else { | |
3696 | ret = 0; | |
3697 | } | |
3698 | } | |
3699 | ||
3700 | l = path->nodes[0]; | |
3701 | slot = path->slots[0]; | |
3702 | ||
3703 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
3704 | ||
3705 | if (found_key.objectid != scrub_dev->devid) | |
3706 | break; | |
3707 | ||
3708 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) | |
3709 | break; | |
3710 | ||
3711 | if (found_key.offset >= end) | |
3712 | break; | |
3713 | ||
3714 | if (found_key.offset < key.offset) | |
3715 | break; | |
3716 | ||
3717 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
3718 | length = btrfs_dev_extent_length(l, dev_extent); | |
3719 | ||
3720 | if (found_key.offset + length <= start) | |
3721 | goto skip; | |
3722 | ||
3723 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
3724 | ||
3725 | /* | |
3726 | * get a reference on the corresponding block group to prevent | |
3727 | * the chunk from going away while we scrub it | |
3728 | */ | |
3729 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
3730 | ||
3731 | /* some chunks are removed but not committed to disk yet, | |
3732 | * continue scrubbing */ | |
3733 | if (!cache) | |
3734 | goto skip; | |
3735 | ||
3736 | if (sctx->is_dev_replace && btrfs_is_zoned(fs_info)) { | |
3737 | spin_lock(&cache->lock); | |
3738 | if (!cache->to_copy) { | |
3739 | spin_unlock(&cache->lock); | |
3740 | btrfs_put_block_group(cache); | |
3741 | goto skip; | |
3742 | } | |
3743 | spin_unlock(&cache->lock); | |
3744 | } | |
3745 | ||
3746 | /* | |
3747 | * Make sure that while we are scrubbing the corresponding block | |
3748 | * group doesn't get its logical address and its device extents | |
3749 | * reused for another block group, which can possibly be of a | |
3750 | * different type and different profile. We do this to prevent | |
3751 | * false error detections and crashes due to bogus attempts to | |
3752 | * repair extents. | |
3753 | */ | |
3754 | spin_lock(&cache->lock); | |
3755 | if (cache->removed) { | |
3756 | spin_unlock(&cache->lock); | |
3757 | btrfs_put_block_group(cache); | |
3758 | goto skip; | |
3759 | } | |
3760 | btrfs_freeze_block_group(cache); | |
3761 | spin_unlock(&cache->lock); | |
3762 | ||
3763 | /* | |
3764 | * we need call btrfs_inc_block_group_ro() with scrubs_paused, | |
3765 | * to avoid deadlock caused by: | |
3766 | * btrfs_inc_block_group_ro() | |
3767 | * -> btrfs_wait_for_commit() | |
3768 | * -> btrfs_commit_transaction() | |
3769 | * -> btrfs_scrub_pause() | |
3770 | */ | |
3771 | scrub_pause_on(fs_info); | |
3772 | ||
3773 | /* | |
3774 | * Don't do chunk preallocation for scrub. | |
3775 | * | |
3776 | * This is especially important for SYSTEM bgs, or we can hit | |
3777 | * -EFBIG from btrfs_finish_chunk_alloc() like: | |
3778 | * 1. The only SYSTEM bg is marked RO. | |
3779 | * Since SYSTEM bg is small, that's pretty common. | |
3780 | * 2. New SYSTEM bg will be allocated | |
3781 | * Due to regular version will allocate new chunk. | |
3782 | * 3. New SYSTEM bg is empty and will get cleaned up | |
3783 | * Before cleanup really happens, it's marked RO again. | |
3784 | * 4. Empty SYSTEM bg get scrubbed | |
3785 | * We go back to 2. | |
3786 | * | |
3787 | * This can easily boost the amount of SYSTEM chunks if cleaner | |
3788 | * thread can't be triggered fast enough, and use up all space | |
3789 | * of btrfs_super_block::sys_chunk_array | |
3790 | * | |
3791 | * While for dev replace, we need to try our best to mark block | |
3792 | * group RO, to prevent race between: | |
3793 | * - Write duplication | |
3794 | * Contains latest data | |
3795 | * - Scrub copy | |
3796 | * Contains data from commit tree | |
3797 | * | |
3798 | * If target block group is not marked RO, nocow writes can | |
3799 | * be overwritten by scrub copy, causing data corruption. | |
3800 | * So for dev-replace, it's not allowed to continue if a block | |
3801 | * group is not RO. | |
3802 | */ | |
3803 | ret = btrfs_inc_block_group_ro(cache, sctx->is_dev_replace); | |
3804 | if (!ret && sctx->is_dev_replace) { | |
3805 | ret = finish_extent_writes_for_zoned(root, cache); | |
3806 | if (ret) { | |
3807 | btrfs_dec_block_group_ro(cache); | |
3808 | scrub_pause_off(fs_info); | |
3809 | btrfs_put_block_group(cache); | |
3810 | break; | |
3811 | } | |
3812 | } | |
3813 | ||
3814 | if (ret == 0) { | |
3815 | ro_set = 1; | |
3816 | } else if (ret == -ENOSPC && !sctx->is_dev_replace) { | |
3817 | /* | |
3818 | * btrfs_inc_block_group_ro return -ENOSPC when it | |
3819 | * failed in creating new chunk for metadata. | |
3820 | * It is not a problem for scrub, because | |
3821 | * metadata are always cowed, and our scrub paused | |
3822 | * commit_transactions. | |
3823 | */ | |
3824 | ro_set = 0; | |
3825 | } else if (ret == -ETXTBSY) { | |
3826 | btrfs_warn(fs_info, | |
3827 | "skipping scrub of block group %llu due to active swapfile", | |
3828 | cache->start); | |
3829 | scrub_pause_off(fs_info); | |
3830 | ret = 0; | |
3831 | goto skip_unfreeze; | |
3832 | } else { | |
3833 | btrfs_warn(fs_info, | |
3834 | "failed setting block group ro: %d", ret); | |
3835 | btrfs_unfreeze_block_group(cache); | |
3836 | btrfs_put_block_group(cache); | |
3837 | scrub_pause_off(fs_info); | |
3838 | break; | |
3839 | } | |
3840 | ||
3841 | /* | |
3842 | * Now the target block is marked RO, wait for nocow writes to | |
3843 | * finish before dev-replace. | |
3844 | * COW is fine, as COW never overwrites extents in commit tree. | |
3845 | */ | |
3846 | if (sctx->is_dev_replace) { | |
3847 | btrfs_wait_nocow_writers(cache); | |
3848 | btrfs_wait_ordered_roots(fs_info, U64_MAX, cache->start, | |
3849 | cache->length); | |
3850 | } | |
3851 | ||
3852 | scrub_pause_off(fs_info); | |
3853 | down_write(&dev_replace->rwsem); | |
3854 | dev_replace->cursor_right = found_key.offset + length; | |
3855 | dev_replace->cursor_left = found_key.offset; | |
3856 | dev_replace->item_needs_writeback = 1; | |
3857 | up_write(&dev_replace->rwsem); | |
3858 | ||
3859 | ret = scrub_chunk(sctx, scrub_dev, chunk_offset, length, | |
3860 | found_key.offset, cache); | |
3861 | ||
3862 | /* | |
3863 | * flush, submit all pending read and write bios, afterwards | |
3864 | * wait for them. | |
3865 | * Note that in the dev replace case, a read request causes | |
3866 | * write requests that are submitted in the read completion | |
3867 | * worker. Therefore in the current situation, it is required | |
3868 | * that all write requests are flushed, so that all read and | |
3869 | * write requests are really completed when bios_in_flight | |
3870 | * changes to 0. | |
3871 | */ | |
3872 | sctx->flush_all_writes = true; | |
3873 | scrub_submit(sctx); | |
3874 | mutex_lock(&sctx->wr_lock); | |
3875 | scrub_wr_submit(sctx); | |
3876 | mutex_unlock(&sctx->wr_lock); | |
3877 | ||
3878 | wait_event(sctx->list_wait, | |
3879 | atomic_read(&sctx->bios_in_flight) == 0); | |
3880 | ||
3881 | scrub_pause_on(fs_info); | |
3882 | ||
3883 | /* | |
3884 | * must be called before we decrease @scrub_paused. | |
3885 | * make sure we don't block transaction commit while | |
3886 | * we are waiting pending workers finished. | |
3887 | */ | |
3888 | wait_event(sctx->list_wait, | |
3889 | atomic_read(&sctx->workers_pending) == 0); | |
3890 | sctx->flush_all_writes = false; | |
3891 | ||
3892 | scrub_pause_off(fs_info); | |
3893 | ||
3894 | if (sctx->is_dev_replace && | |
3895 | !btrfs_finish_block_group_to_copy(dev_replace->srcdev, | |
3896 | cache, found_key.offset)) | |
3897 | ro_set = 0; | |
3898 | ||
3899 | down_write(&dev_replace->rwsem); | |
3900 | dev_replace->cursor_left = dev_replace->cursor_right; | |
3901 | dev_replace->item_needs_writeback = 1; | |
3902 | up_write(&dev_replace->rwsem); | |
3903 | ||
3904 | if (ro_set) | |
3905 | btrfs_dec_block_group_ro(cache); | |
3906 | ||
3907 | /* | |
3908 | * We might have prevented the cleaner kthread from deleting | |
3909 | * this block group if it was already unused because we raced | |
3910 | * and set it to RO mode first. So add it back to the unused | |
3911 | * list, otherwise it might not ever be deleted unless a manual | |
3912 | * balance is triggered or it becomes used and unused again. | |
3913 | */ | |
3914 | spin_lock(&cache->lock); | |
3915 | if (!cache->removed && !cache->ro && cache->reserved == 0 && | |
3916 | cache->used == 0) { | |
3917 | spin_unlock(&cache->lock); | |
3918 | if (btrfs_test_opt(fs_info, DISCARD_ASYNC)) | |
3919 | btrfs_discard_queue_work(&fs_info->discard_ctl, | |
3920 | cache); | |
3921 | else | |
3922 | btrfs_mark_bg_unused(cache); | |
3923 | } else { | |
3924 | spin_unlock(&cache->lock); | |
3925 | } | |
3926 | skip_unfreeze: | |
3927 | btrfs_unfreeze_block_group(cache); | |
3928 | btrfs_put_block_group(cache); | |
3929 | if (ret) | |
3930 | break; | |
3931 | if (sctx->is_dev_replace && | |
3932 | atomic64_read(&dev_replace->num_write_errors) > 0) { | |
3933 | ret = -EIO; | |
3934 | break; | |
3935 | } | |
3936 | if (sctx->stat.malloc_errors > 0) { | |
3937 | ret = -ENOMEM; | |
3938 | break; | |
3939 | } | |
3940 | skip: | |
3941 | key.offset = found_key.offset + length; | |
3942 | btrfs_release_path(path); | |
3943 | } | |
3944 | ||
3945 | btrfs_free_path(path); | |
3946 | ||
3947 | return ret; | |
3948 | } | |
3949 | ||
3950 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, | |
3951 | struct btrfs_device *scrub_dev) | |
3952 | { | |
3953 | int i; | |
3954 | u64 bytenr; | |
3955 | u64 gen; | |
3956 | int ret; | |
3957 | struct btrfs_fs_info *fs_info = sctx->fs_info; | |
3958 | ||
3959 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) | |
3960 | return -EROFS; | |
3961 | ||
3962 | /* Seed devices of a new filesystem has their own generation. */ | |
3963 | if (scrub_dev->fs_devices != fs_info->fs_devices) | |
3964 | gen = scrub_dev->generation; | |
3965 | else | |
3966 | gen = fs_info->last_trans_committed; | |
3967 | ||
3968 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
3969 | bytenr = btrfs_sb_offset(i); | |
3970 | if (bytenr + BTRFS_SUPER_INFO_SIZE > | |
3971 | scrub_dev->commit_total_bytes) | |
3972 | break; | |
3973 | if (!btrfs_check_super_location(scrub_dev, bytenr)) | |
3974 | continue; | |
3975 | ||
3976 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, | |
3977 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, | |
3978 | NULL, bytenr); | |
3979 | if (ret) | |
3980 | return ret; | |
3981 | } | |
3982 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); | |
3983 | ||
3984 | return 0; | |
3985 | } | |
3986 | ||
3987 | static void scrub_workers_put(struct btrfs_fs_info *fs_info) | |
3988 | { | |
3989 | if (refcount_dec_and_mutex_lock(&fs_info->scrub_workers_refcnt, | |
3990 | &fs_info->scrub_lock)) { | |
3991 | struct btrfs_workqueue *scrub_workers = NULL; | |
3992 | struct btrfs_workqueue *scrub_wr_comp = NULL; | |
3993 | struct btrfs_workqueue *scrub_parity = NULL; | |
3994 | ||
3995 | scrub_workers = fs_info->scrub_workers; | |
3996 | scrub_wr_comp = fs_info->scrub_wr_completion_workers; | |
3997 | scrub_parity = fs_info->scrub_parity_workers; | |
3998 | ||
3999 | fs_info->scrub_workers = NULL; | |
4000 | fs_info->scrub_wr_completion_workers = NULL; | |
4001 | fs_info->scrub_parity_workers = NULL; | |
4002 | mutex_unlock(&fs_info->scrub_lock); | |
4003 | ||
4004 | btrfs_destroy_workqueue(scrub_workers); | |
4005 | btrfs_destroy_workqueue(scrub_wr_comp); | |
4006 | btrfs_destroy_workqueue(scrub_parity); | |
4007 | } | |
4008 | } | |
4009 | ||
4010 | /* | |
4011 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
4012 | */ | |
4013 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, | |
4014 | int is_dev_replace) | |
4015 | { | |
4016 | struct btrfs_workqueue *scrub_workers = NULL; | |
4017 | struct btrfs_workqueue *scrub_wr_comp = NULL; | |
4018 | struct btrfs_workqueue *scrub_parity = NULL; | |
4019 | unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND; | |
4020 | int max_active = fs_info->thread_pool_size; | |
4021 | int ret = -ENOMEM; | |
4022 | ||
4023 | if (refcount_inc_not_zero(&fs_info->scrub_workers_refcnt)) | |
4024 | return 0; | |
4025 | ||
4026 | scrub_workers = btrfs_alloc_workqueue(fs_info, "scrub", flags, | |
4027 | is_dev_replace ? 1 : max_active, 4); | |
4028 | if (!scrub_workers) | |
4029 | goto fail_scrub_workers; | |
4030 | ||
4031 | scrub_wr_comp = btrfs_alloc_workqueue(fs_info, "scrubwrc", flags, | |
4032 | max_active, 2); | |
4033 | if (!scrub_wr_comp) | |
4034 | goto fail_scrub_wr_completion_workers; | |
4035 | ||
4036 | scrub_parity = btrfs_alloc_workqueue(fs_info, "scrubparity", flags, | |
4037 | max_active, 2); | |
4038 | if (!scrub_parity) | |
4039 | goto fail_scrub_parity_workers; | |
4040 | ||
4041 | mutex_lock(&fs_info->scrub_lock); | |
4042 | if (refcount_read(&fs_info->scrub_workers_refcnt) == 0) { | |
4043 | ASSERT(fs_info->scrub_workers == NULL && | |
4044 | fs_info->scrub_wr_completion_workers == NULL && | |
4045 | fs_info->scrub_parity_workers == NULL); | |
4046 | fs_info->scrub_workers = scrub_workers; | |
4047 | fs_info->scrub_wr_completion_workers = scrub_wr_comp; | |
4048 | fs_info->scrub_parity_workers = scrub_parity; | |
4049 | refcount_set(&fs_info->scrub_workers_refcnt, 1); | |
4050 | mutex_unlock(&fs_info->scrub_lock); | |
4051 | return 0; | |
4052 | } | |
4053 | /* Other thread raced in and created the workers for us */ | |
4054 | refcount_inc(&fs_info->scrub_workers_refcnt); | |
4055 | mutex_unlock(&fs_info->scrub_lock); | |
4056 | ||
4057 | ret = 0; | |
4058 | btrfs_destroy_workqueue(scrub_parity); | |
4059 | fail_scrub_parity_workers: | |
4060 | btrfs_destroy_workqueue(scrub_wr_comp); | |
4061 | fail_scrub_wr_completion_workers: | |
4062 | btrfs_destroy_workqueue(scrub_workers); | |
4063 | fail_scrub_workers: | |
4064 | return ret; | |
4065 | } | |
4066 | ||
4067 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, | |
4068 | u64 end, struct btrfs_scrub_progress *progress, | |
4069 | int readonly, int is_dev_replace) | |
4070 | { | |
4071 | struct scrub_ctx *sctx; | |
4072 | int ret; | |
4073 | struct btrfs_device *dev; | |
4074 | unsigned int nofs_flag; | |
4075 | ||
4076 | if (btrfs_fs_closing(fs_info)) | |
4077 | return -EAGAIN; | |
4078 | ||
4079 | if (fs_info->nodesize > BTRFS_STRIPE_LEN) { | |
4080 | /* | |
4081 | * in this case scrub is unable to calculate the checksum | |
4082 | * the way scrub is implemented. Do not handle this | |
4083 | * situation at all because it won't ever happen. | |
4084 | */ | |
4085 | btrfs_err(fs_info, | |
4086 | "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails", | |
4087 | fs_info->nodesize, | |
4088 | BTRFS_STRIPE_LEN); | |
4089 | return -EINVAL; | |
4090 | } | |
4091 | ||
4092 | if (fs_info->nodesize > | |
4093 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || | |
4094 | fs_info->sectorsize > PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { | |
4095 | /* | |
4096 | * would exhaust the array bounds of pagev member in | |
4097 | * struct scrub_block | |
4098 | */ | |
4099 | btrfs_err(fs_info, | |
4100 | "scrub: size assumption nodesize and sectorsize <= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails", | |
4101 | fs_info->nodesize, | |
4102 | SCRUB_MAX_PAGES_PER_BLOCK, | |
4103 | fs_info->sectorsize, | |
4104 | SCRUB_MAX_PAGES_PER_BLOCK); | |
4105 | return -EINVAL; | |
4106 | } | |
4107 | ||
4108 | /* Allocate outside of device_list_mutex */ | |
4109 | sctx = scrub_setup_ctx(fs_info, is_dev_replace); | |
4110 | if (IS_ERR(sctx)) | |
4111 | return PTR_ERR(sctx); | |
4112 | ||
4113 | ret = scrub_workers_get(fs_info, is_dev_replace); | |
4114 | if (ret) | |
4115 | goto out_free_ctx; | |
4116 | ||
4117 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
4118 | dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); | |
4119 | if (!dev || (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state) && | |
4120 | !is_dev_replace)) { | |
4121 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
4122 | ret = -ENODEV; | |
4123 | goto out; | |
4124 | } | |
4125 | ||
4126 | if (!is_dev_replace && !readonly && | |
4127 | !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state)) { | |
4128 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
4129 | btrfs_err_in_rcu(fs_info, | |
4130 | "scrub on devid %llu: filesystem on %s is not writable", | |
4131 | devid, rcu_str_deref(dev->name)); | |
4132 | ret = -EROFS; | |
4133 | goto out; | |
4134 | } | |
4135 | ||
4136 | mutex_lock(&fs_info->scrub_lock); | |
4137 | if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) || | |
4138 | test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &dev->dev_state)) { | |
4139 | mutex_unlock(&fs_info->scrub_lock); | |
4140 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
4141 | ret = -EIO; | |
4142 | goto out; | |
4143 | } | |
4144 | ||
4145 | down_read(&fs_info->dev_replace.rwsem); | |
4146 | if (dev->scrub_ctx || | |
4147 | (!is_dev_replace && | |
4148 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { | |
4149 | up_read(&fs_info->dev_replace.rwsem); | |
4150 | mutex_unlock(&fs_info->scrub_lock); | |
4151 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
4152 | ret = -EINPROGRESS; | |
4153 | goto out; | |
4154 | } | |
4155 | up_read(&fs_info->dev_replace.rwsem); | |
4156 | ||
4157 | sctx->readonly = readonly; | |
4158 | dev->scrub_ctx = sctx; | |
4159 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
4160 | ||
4161 | /* | |
4162 | * checking @scrub_pause_req here, we can avoid | |
4163 | * race between committing transaction and scrubbing. | |
4164 | */ | |
4165 | __scrub_blocked_if_needed(fs_info); | |
4166 | atomic_inc(&fs_info->scrubs_running); | |
4167 | mutex_unlock(&fs_info->scrub_lock); | |
4168 | ||
4169 | /* | |
4170 | * In order to avoid deadlock with reclaim when there is a transaction | |
4171 | * trying to pause scrub, make sure we use GFP_NOFS for all the | |
4172 | * allocations done at btrfs_scrub_pages() and scrub_pages_for_parity() | |
4173 | * invoked by our callees. The pausing request is done when the | |
4174 | * transaction commit starts, and it blocks the transaction until scrub | |
4175 | * is paused (done at specific points at scrub_stripe() or right above | |
4176 | * before incrementing fs_info->scrubs_running). | |
4177 | */ | |
4178 | nofs_flag = memalloc_nofs_save(); | |
4179 | if (!is_dev_replace) { | |
4180 | btrfs_info(fs_info, "scrub: started on devid %llu", devid); | |
4181 | /* | |
4182 | * by holding device list mutex, we can | |
4183 | * kick off writing super in log tree sync. | |
4184 | */ | |
4185 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
4186 | ret = scrub_supers(sctx, dev); | |
4187 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
4188 | } | |
4189 | ||
4190 | if (!ret) | |
4191 | ret = scrub_enumerate_chunks(sctx, dev, start, end); | |
4192 | memalloc_nofs_restore(nofs_flag); | |
4193 | ||
4194 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); | |
4195 | atomic_dec(&fs_info->scrubs_running); | |
4196 | wake_up(&fs_info->scrub_pause_wait); | |
4197 | ||
4198 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); | |
4199 | ||
4200 | if (progress) | |
4201 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
4202 | ||
4203 | if (!is_dev_replace) | |
4204 | btrfs_info(fs_info, "scrub: %s on devid %llu with status: %d", | |
4205 | ret ? "not finished" : "finished", devid, ret); | |
4206 | ||
4207 | mutex_lock(&fs_info->scrub_lock); | |
4208 | dev->scrub_ctx = NULL; | |
4209 | mutex_unlock(&fs_info->scrub_lock); | |
4210 | ||
4211 | scrub_workers_put(fs_info); | |
4212 | scrub_put_ctx(sctx); | |
4213 | ||
4214 | return ret; | |
4215 | out: | |
4216 | scrub_workers_put(fs_info); | |
4217 | out_free_ctx: | |
4218 | scrub_free_ctx(sctx); | |
4219 | ||
4220 | return ret; | |
4221 | } | |
4222 | ||
4223 | void btrfs_scrub_pause(struct btrfs_fs_info *fs_info) | |
4224 | { | |
4225 | mutex_lock(&fs_info->scrub_lock); | |
4226 | atomic_inc(&fs_info->scrub_pause_req); | |
4227 | while (atomic_read(&fs_info->scrubs_paused) != | |
4228 | atomic_read(&fs_info->scrubs_running)) { | |
4229 | mutex_unlock(&fs_info->scrub_lock); | |
4230 | wait_event(fs_info->scrub_pause_wait, | |
4231 | atomic_read(&fs_info->scrubs_paused) == | |
4232 | atomic_read(&fs_info->scrubs_running)); | |
4233 | mutex_lock(&fs_info->scrub_lock); | |
4234 | } | |
4235 | mutex_unlock(&fs_info->scrub_lock); | |
4236 | } | |
4237 | ||
4238 | void btrfs_scrub_continue(struct btrfs_fs_info *fs_info) | |
4239 | { | |
4240 | atomic_dec(&fs_info->scrub_pause_req); | |
4241 | wake_up(&fs_info->scrub_pause_wait); | |
4242 | } | |
4243 | ||
4244 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) | |
4245 | { | |
4246 | mutex_lock(&fs_info->scrub_lock); | |
4247 | if (!atomic_read(&fs_info->scrubs_running)) { | |
4248 | mutex_unlock(&fs_info->scrub_lock); | |
4249 | return -ENOTCONN; | |
4250 | } | |
4251 | ||
4252 | atomic_inc(&fs_info->scrub_cancel_req); | |
4253 | while (atomic_read(&fs_info->scrubs_running)) { | |
4254 | mutex_unlock(&fs_info->scrub_lock); | |
4255 | wait_event(fs_info->scrub_pause_wait, | |
4256 | atomic_read(&fs_info->scrubs_running) == 0); | |
4257 | mutex_lock(&fs_info->scrub_lock); | |
4258 | } | |
4259 | atomic_dec(&fs_info->scrub_cancel_req); | |
4260 | mutex_unlock(&fs_info->scrub_lock); | |
4261 | ||
4262 | return 0; | |
4263 | } | |
4264 | ||
4265 | int btrfs_scrub_cancel_dev(struct btrfs_device *dev) | |
4266 | { | |
4267 | struct btrfs_fs_info *fs_info = dev->fs_info; | |
4268 | struct scrub_ctx *sctx; | |
4269 | ||
4270 | mutex_lock(&fs_info->scrub_lock); | |
4271 | sctx = dev->scrub_ctx; | |
4272 | if (!sctx) { | |
4273 | mutex_unlock(&fs_info->scrub_lock); | |
4274 | return -ENOTCONN; | |
4275 | } | |
4276 | atomic_inc(&sctx->cancel_req); | |
4277 | while (dev->scrub_ctx) { | |
4278 | mutex_unlock(&fs_info->scrub_lock); | |
4279 | wait_event(fs_info->scrub_pause_wait, | |
4280 | dev->scrub_ctx == NULL); | |
4281 | mutex_lock(&fs_info->scrub_lock); | |
4282 | } | |
4283 | mutex_unlock(&fs_info->scrub_lock); | |
4284 | ||
4285 | return 0; | |
4286 | } | |
4287 | ||
4288 | int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid, | |
4289 | struct btrfs_scrub_progress *progress) | |
4290 | { | |
4291 | struct btrfs_device *dev; | |
4292 | struct scrub_ctx *sctx = NULL; | |
4293 | ||
4294 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
4295 | dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); | |
4296 | if (dev) | |
4297 | sctx = dev->scrub_ctx; | |
4298 | if (sctx) | |
4299 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
4300 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
4301 | ||
4302 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; | |
4303 | } | |
4304 | ||
4305 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
4306 | u64 extent_logical, u32 extent_len, | |
4307 | u64 *extent_physical, | |
4308 | struct btrfs_device **extent_dev, | |
4309 | int *extent_mirror_num) | |
4310 | { | |
4311 | u64 mapped_length; | |
4312 | struct btrfs_bio *bbio = NULL; | |
4313 | int ret; | |
4314 | ||
4315 | mapped_length = extent_len; | |
4316 | ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, extent_logical, | |
4317 | &mapped_length, &bbio, 0); | |
4318 | if (ret || !bbio || mapped_length < extent_len || | |
4319 | !bbio->stripes[0].dev->bdev) { | |
4320 | btrfs_put_bbio(bbio); | |
4321 | return; | |
4322 | } | |
4323 | ||
4324 | *extent_physical = bbio->stripes[0].physical; | |
4325 | *extent_mirror_num = bbio->mirror_num; | |
4326 | *extent_dev = bbio->stripes[0].dev; | |
4327 | btrfs_put_bbio(bbio); | |
4328 | } |