Commit | Line | Data |
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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a2de733c | 2 | /* |
b6bfebc1 | 3 | * Copyright (C) 2011, 2012 STRATO. All rights reserved. |
a2de733c AJ |
4 | */ |
5 | ||
a2de733c | 6 | #include <linux/blkdev.h> |
558540c1 | 7 | #include <linux/ratelimit.h> |
de2491fd | 8 | #include <linux/sched/mm.h> |
d5178578 | 9 | #include <crypto/hash.h> |
a2de733c AJ |
10 | #include "ctree.h" |
11 | #include "volumes.h" | |
12 | #include "disk-io.h" | |
13 | #include "ordered-data.h" | |
0ef8e451 | 14 | #include "transaction.h" |
558540c1 | 15 | #include "backref.h" |
5da6fcbc | 16 | #include "extent_io.h" |
ff023aac | 17 | #include "dev-replace.h" |
21adbd5c | 18 | #include "check-integrity.h" |
606686ee | 19 | #include "rcu-string.h" |
53b381b3 | 20 | #include "raid56.h" |
a2de733c AJ |
21 | |
22 | /* | |
23 | * This is only the first step towards a full-features scrub. It reads all | |
24 | * extent and super block and verifies the checksums. In case a bad checksum | |
25 | * is found or the extent cannot be read, good data will be written back if | |
26 | * any can be found. | |
27 | * | |
28 | * Future enhancements: | |
a2de733c AJ |
29 | * - In case an unrepairable extent is encountered, track which files are |
30 | * affected and report them | |
a2de733c | 31 | * - track and record media errors, throw out bad devices |
a2de733c | 32 | * - add a mode to also read unallocated space |
a2de733c AJ |
33 | */ |
34 | ||
b5d67f64 | 35 | struct scrub_block; |
d9d181c1 | 36 | struct scrub_ctx; |
a2de733c | 37 | |
ff023aac SB |
38 | /* |
39 | * the following three values only influence the performance. | |
40 | * The last one configures the number of parallel and outstanding I/O | |
41 | * operations. The first two values configure an upper limit for the number | |
42 | * of (dynamically allocated) pages that are added to a bio. | |
43 | */ | |
44 | #define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */ | |
45 | #define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */ | |
46 | #define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */ | |
7a9e9987 SB |
47 | |
48 | /* | |
49 | * the following value times PAGE_SIZE needs to be large enough to match the | |
50 | * largest node/leaf/sector size that shall be supported. | |
51 | * Values larger than BTRFS_STRIPE_LEN are not supported. | |
52 | */ | |
b5d67f64 | 53 | #define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */ |
a2de733c | 54 | |
af8e2d1d | 55 | struct scrub_recover { |
6f615018 | 56 | refcount_t refs; |
af8e2d1d | 57 | struct btrfs_bio *bbio; |
af8e2d1d MX |
58 | u64 map_length; |
59 | }; | |
60 | ||
a2de733c | 61 | struct scrub_page { |
b5d67f64 SB |
62 | struct scrub_block *sblock; |
63 | struct page *page; | |
442a4f63 | 64 | struct btrfs_device *dev; |
5a6ac9ea | 65 | struct list_head list; |
a2de733c AJ |
66 | u64 flags; /* extent flags */ |
67 | u64 generation; | |
b5d67f64 SB |
68 | u64 logical; |
69 | u64 physical; | |
ff023aac | 70 | u64 physical_for_dev_replace; |
57019345 | 71 | atomic_t refs; |
b5d67f64 SB |
72 | struct { |
73 | unsigned int mirror_num:8; | |
74 | unsigned int have_csum:1; | |
75 | unsigned int io_error:1; | |
76 | }; | |
a2de733c | 77 | u8 csum[BTRFS_CSUM_SIZE]; |
af8e2d1d MX |
78 | |
79 | struct scrub_recover *recover; | |
a2de733c AJ |
80 | }; |
81 | ||
82 | struct scrub_bio { | |
83 | int index; | |
d9d181c1 | 84 | struct scrub_ctx *sctx; |
a36cf8b8 | 85 | struct btrfs_device *dev; |
a2de733c | 86 | struct bio *bio; |
4e4cbee9 | 87 | blk_status_t status; |
a2de733c AJ |
88 | u64 logical; |
89 | u64 physical; | |
ff023aac SB |
90 | #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO |
91 | struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO]; | |
92 | #else | |
93 | struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO]; | |
94 | #endif | |
b5d67f64 | 95 | int page_count; |
a2de733c AJ |
96 | int next_free; |
97 | struct btrfs_work work; | |
98 | }; | |
99 | ||
b5d67f64 | 100 | struct scrub_block { |
7a9e9987 | 101 | struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK]; |
b5d67f64 SB |
102 | int page_count; |
103 | atomic_t outstanding_pages; | |
186debd6 | 104 | refcount_t refs; /* free mem on transition to zero */ |
d9d181c1 | 105 | struct scrub_ctx *sctx; |
5a6ac9ea | 106 | struct scrub_parity *sparity; |
b5d67f64 SB |
107 | struct { |
108 | unsigned int header_error:1; | |
109 | unsigned int checksum_error:1; | |
110 | unsigned int no_io_error_seen:1; | |
442a4f63 | 111 | unsigned int generation_error:1; /* also sets header_error */ |
5a6ac9ea MX |
112 | |
113 | /* The following is for the data used to check parity */ | |
114 | /* It is for the data with checksum */ | |
115 | unsigned int data_corrected:1; | |
b5d67f64 | 116 | }; |
73ff61db | 117 | struct btrfs_work work; |
b5d67f64 SB |
118 | }; |
119 | ||
5a6ac9ea MX |
120 | /* Used for the chunks with parity stripe such RAID5/6 */ |
121 | struct scrub_parity { | |
122 | struct scrub_ctx *sctx; | |
123 | ||
124 | struct btrfs_device *scrub_dev; | |
125 | ||
126 | u64 logic_start; | |
127 | ||
128 | u64 logic_end; | |
129 | ||
130 | int nsectors; | |
131 | ||
972d7219 | 132 | u64 stripe_len; |
5a6ac9ea | 133 | |
78a76450 | 134 | refcount_t refs; |
5a6ac9ea MX |
135 | |
136 | struct list_head spages; | |
137 | ||
138 | /* Work of parity check and repair */ | |
139 | struct btrfs_work work; | |
140 | ||
141 | /* Mark the parity blocks which have data */ | |
142 | unsigned long *dbitmap; | |
143 | ||
144 | /* | |
145 | * Mark the parity blocks which have data, but errors happen when | |
146 | * read data or check data | |
147 | */ | |
148 | unsigned long *ebitmap; | |
149 | ||
150 | unsigned long bitmap[0]; | |
151 | }; | |
152 | ||
d9d181c1 | 153 | struct scrub_ctx { |
ff023aac | 154 | struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX]; |
fb456252 | 155 | struct btrfs_fs_info *fs_info; |
a2de733c AJ |
156 | int first_free; |
157 | int curr; | |
b6bfebc1 SB |
158 | atomic_t bios_in_flight; |
159 | atomic_t workers_pending; | |
a2de733c AJ |
160 | spinlock_t list_lock; |
161 | wait_queue_head_t list_wait; | |
162 | u16 csum_size; | |
163 | struct list_head csum_list; | |
164 | atomic_t cancel_req; | |
8628764e | 165 | int readonly; |
ff023aac | 166 | int pages_per_rd_bio; |
63a212ab SB |
167 | |
168 | int is_dev_replace; | |
3fb99303 DS |
169 | |
170 | struct scrub_bio *wr_curr_bio; | |
171 | struct mutex wr_lock; | |
172 | int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */ | |
3fb99303 | 173 | struct btrfs_device *wr_tgtdev; |
2073c4c2 | 174 | bool flush_all_writes; |
63a212ab | 175 | |
a2de733c AJ |
176 | /* |
177 | * statistics | |
178 | */ | |
179 | struct btrfs_scrub_progress stat; | |
180 | spinlock_t stat_lock; | |
f55985f4 FM |
181 | |
182 | /* | |
183 | * Use a ref counter to avoid use-after-free issues. Scrub workers | |
184 | * decrement bios_in_flight and workers_pending and then do a wakeup | |
185 | * on the list_wait wait queue. We must ensure the main scrub task | |
186 | * doesn't free the scrub context before or while the workers are | |
187 | * doing the wakeup() call. | |
188 | */ | |
99f4cdb1 | 189 | refcount_t refs; |
a2de733c AJ |
190 | }; |
191 | ||
558540c1 JS |
192 | struct scrub_warning { |
193 | struct btrfs_path *path; | |
194 | u64 extent_item_size; | |
558540c1 | 195 | const char *errstr; |
6aa21263 | 196 | u64 physical; |
558540c1 JS |
197 | u64 logical; |
198 | struct btrfs_device *dev; | |
558540c1 JS |
199 | }; |
200 | ||
0966a7b1 QW |
201 | struct full_stripe_lock { |
202 | struct rb_node node; | |
203 | u64 logical; | |
204 | u64 refs; | |
205 | struct mutex mutex; | |
206 | }; | |
207 | ||
b6bfebc1 SB |
208 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx); |
209 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx); | |
b5d67f64 | 210 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check); |
be50a8dd | 211 | static int scrub_setup_recheck_block(struct scrub_block *original_sblock, |
ff023aac | 212 | struct scrub_block *sblocks_for_recheck); |
34f5c8e9 | 213 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
affe4a5a ZL |
214 | struct scrub_block *sblock, |
215 | int retry_failed_mirror); | |
ba7cf988 | 216 | static void scrub_recheck_block_checksum(struct scrub_block *sblock); |
b5d67f64 | 217 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
114ab50d | 218 | struct scrub_block *sblock_good); |
b5d67f64 SB |
219 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, |
220 | struct scrub_block *sblock_good, | |
221 | int page_num, int force_write); | |
ff023aac SB |
222 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock); |
223 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
224 | int page_num); | |
b5d67f64 SB |
225 | static int scrub_checksum_data(struct scrub_block *sblock); |
226 | static int scrub_checksum_tree_block(struct scrub_block *sblock); | |
227 | static int scrub_checksum_super(struct scrub_block *sblock); | |
228 | static void scrub_block_get(struct scrub_block *sblock); | |
229 | static void scrub_block_put(struct scrub_block *sblock); | |
7a9e9987 SB |
230 | static void scrub_page_get(struct scrub_page *spage); |
231 | static void scrub_page_put(struct scrub_page *spage); | |
5a6ac9ea MX |
232 | static void scrub_parity_get(struct scrub_parity *sparity); |
233 | static void scrub_parity_put(struct scrub_parity *sparity); | |
ff023aac SB |
234 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
235 | struct scrub_page *spage); | |
d9d181c1 | 236 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 237 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
238 | u64 gen, int mirror_num, u8 *csum, int force, |
239 | u64 physical_for_dev_replace); | |
4246a0b6 | 240 | static void scrub_bio_end_io(struct bio *bio); |
b5d67f64 SB |
241 | static void scrub_bio_end_io_worker(struct btrfs_work *work); |
242 | static void scrub_block_complete(struct scrub_block *sblock); | |
ff023aac SB |
243 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, |
244 | u64 extent_logical, u64 extent_len, | |
245 | u64 *extent_physical, | |
246 | struct btrfs_device **extent_dev, | |
247 | int *extent_mirror_num); | |
ff023aac SB |
248 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, |
249 | struct scrub_page *spage); | |
250 | static void scrub_wr_submit(struct scrub_ctx *sctx); | |
4246a0b6 | 251 | static void scrub_wr_bio_end_io(struct bio *bio); |
ff023aac | 252 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work); |
cb7ab021 | 253 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
3cb0929a | 254 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
f55985f4 | 255 | static void scrub_put_ctx(struct scrub_ctx *sctx); |
1623edeb | 256 | |
762221f0 LB |
257 | static inline int scrub_is_page_on_raid56(struct scrub_page *page) |
258 | { | |
259 | return page->recover && | |
260 | (page->recover->bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK); | |
261 | } | |
1623edeb | 262 | |
b6bfebc1 SB |
263 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx) |
264 | { | |
99f4cdb1 | 265 | refcount_inc(&sctx->refs); |
b6bfebc1 SB |
266 | atomic_inc(&sctx->bios_in_flight); |
267 | } | |
268 | ||
269 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx) | |
270 | { | |
271 | atomic_dec(&sctx->bios_in_flight); | |
272 | wake_up(&sctx->list_wait); | |
f55985f4 | 273 | scrub_put_ctx(sctx); |
b6bfebc1 SB |
274 | } |
275 | ||
cb7ab021 | 276 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
3cb0929a WS |
277 | { |
278 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
279 | mutex_unlock(&fs_info->scrub_lock); | |
280 | wait_event(fs_info->scrub_pause_wait, | |
281 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
282 | mutex_lock(&fs_info->scrub_lock); | |
283 | } | |
284 | } | |
285 | ||
0e22be89 | 286 | static void scrub_pause_on(struct btrfs_fs_info *fs_info) |
cb7ab021 WS |
287 | { |
288 | atomic_inc(&fs_info->scrubs_paused); | |
289 | wake_up(&fs_info->scrub_pause_wait); | |
0e22be89 | 290 | } |
cb7ab021 | 291 | |
0e22be89 Z |
292 | static void scrub_pause_off(struct btrfs_fs_info *fs_info) |
293 | { | |
cb7ab021 WS |
294 | mutex_lock(&fs_info->scrub_lock); |
295 | __scrub_blocked_if_needed(fs_info); | |
296 | atomic_dec(&fs_info->scrubs_paused); | |
297 | mutex_unlock(&fs_info->scrub_lock); | |
298 | ||
299 | wake_up(&fs_info->scrub_pause_wait); | |
300 | } | |
301 | ||
0e22be89 Z |
302 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
303 | { | |
304 | scrub_pause_on(fs_info); | |
305 | scrub_pause_off(fs_info); | |
306 | } | |
307 | ||
0966a7b1 QW |
308 | /* |
309 | * Insert new full stripe lock into full stripe locks tree | |
310 | * | |
311 | * Return pointer to existing or newly inserted full_stripe_lock structure if | |
312 | * everything works well. | |
313 | * Return ERR_PTR(-ENOMEM) if we failed to allocate memory | |
314 | * | |
315 | * NOTE: caller must hold full_stripe_locks_root->lock before calling this | |
316 | * function | |
317 | */ | |
318 | static struct full_stripe_lock *insert_full_stripe_lock( | |
319 | struct btrfs_full_stripe_locks_tree *locks_root, | |
320 | u64 fstripe_logical) | |
321 | { | |
322 | struct rb_node **p; | |
323 | struct rb_node *parent = NULL; | |
324 | struct full_stripe_lock *entry; | |
325 | struct full_stripe_lock *ret; | |
326 | ||
a32bf9a3 | 327 | lockdep_assert_held(&locks_root->lock); |
0966a7b1 QW |
328 | |
329 | p = &locks_root->root.rb_node; | |
330 | while (*p) { | |
331 | parent = *p; | |
332 | entry = rb_entry(parent, struct full_stripe_lock, node); | |
333 | if (fstripe_logical < entry->logical) { | |
334 | p = &(*p)->rb_left; | |
335 | } else if (fstripe_logical > entry->logical) { | |
336 | p = &(*p)->rb_right; | |
337 | } else { | |
338 | entry->refs++; | |
339 | return entry; | |
340 | } | |
341 | } | |
342 | ||
a5fb1142 FM |
343 | /* |
344 | * Insert new lock. | |
a5fb1142 | 345 | */ |
0966a7b1 QW |
346 | ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
347 | if (!ret) | |
348 | return ERR_PTR(-ENOMEM); | |
349 | ret->logical = fstripe_logical; | |
350 | ret->refs = 1; | |
351 | mutex_init(&ret->mutex); | |
352 | ||
353 | rb_link_node(&ret->node, parent, p); | |
354 | rb_insert_color(&ret->node, &locks_root->root); | |
355 | return ret; | |
356 | } | |
357 | ||
358 | /* | |
359 | * Search for a full stripe lock of a block group | |
360 | * | |
361 | * Return pointer to existing full stripe lock if found | |
362 | * Return NULL if not found | |
363 | */ | |
364 | static struct full_stripe_lock *search_full_stripe_lock( | |
365 | struct btrfs_full_stripe_locks_tree *locks_root, | |
366 | u64 fstripe_logical) | |
367 | { | |
368 | struct rb_node *node; | |
369 | struct full_stripe_lock *entry; | |
370 | ||
a32bf9a3 | 371 | lockdep_assert_held(&locks_root->lock); |
0966a7b1 QW |
372 | |
373 | node = locks_root->root.rb_node; | |
374 | while (node) { | |
375 | entry = rb_entry(node, struct full_stripe_lock, node); | |
376 | if (fstripe_logical < entry->logical) | |
377 | node = node->rb_left; | |
378 | else if (fstripe_logical > entry->logical) | |
379 | node = node->rb_right; | |
380 | else | |
381 | return entry; | |
382 | } | |
383 | return NULL; | |
384 | } | |
385 | ||
386 | /* | |
387 | * Helper to get full stripe logical from a normal bytenr. | |
388 | * | |
389 | * Caller must ensure @cache is a RAID56 block group. | |
390 | */ | |
391 | static u64 get_full_stripe_logical(struct btrfs_block_group_cache *cache, | |
392 | u64 bytenr) | |
393 | { | |
394 | u64 ret; | |
395 | ||
396 | /* | |
397 | * Due to chunk item size limit, full stripe length should not be | |
398 | * larger than U32_MAX. Just a sanity check here. | |
399 | */ | |
400 | WARN_ON_ONCE(cache->full_stripe_len >= U32_MAX); | |
401 | ||
402 | /* | |
403 | * round_down() can only handle power of 2, while RAID56 full | |
404 | * stripe length can be 64KiB * n, so we need to manually round down. | |
405 | */ | |
406 | ret = div64_u64(bytenr - cache->key.objectid, cache->full_stripe_len) * | |
407 | cache->full_stripe_len + cache->key.objectid; | |
408 | return ret; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Lock a full stripe to avoid concurrency of recovery and read | |
413 | * | |
414 | * It's only used for profiles with parities (RAID5/6), for other profiles it | |
415 | * does nothing. | |
416 | * | |
417 | * Return 0 if we locked full stripe covering @bytenr, with a mutex held. | |
418 | * So caller must call unlock_full_stripe() at the same context. | |
419 | * | |
420 | * Return <0 if encounters error. | |
421 | */ | |
422 | static int lock_full_stripe(struct btrfs_fs_info *fs_info, u64 bytenr, | |
423 | bool *locked_ret) | |
424 | { | |
425 | struct btrfs_block_group_cache *bg_cache; | |
426 | struct btrfs_full_stripe_locks_tree *locks_root; | |
427 | struct full_stripe_lock *existing; | |
428 | u64 fstripe_start; | |
429 | int ret = 0; | |
430 | ||
431 | *locked_ret = false; | |
432 | bg_cache = btrfs_lookup_block_group(fs_info, bytenr); | |
433 | if (!bg_cache) { | |
434 | ASSERT(0); | |
435 | return -ENOENT; | |
436 | } | |
437 | ||
438 | /* Profiles not based on parity don't need full stripe lock */ | |
439 | if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_RAID56_MASK)) | |
440 | goto out; | |
441 | locks_root = &bg_cache->full_stripe_locks_root; | |
442 | ||
443 | fstripe_start = get_full_stripe_logical(bg_cache, bytenr); | |
444 | ||
445 | /* Now insert the full stripe lock */ | |
446 | mutex_lock(&locks_root->lock); | |
447 | existing = insert_full_stripe_lock(locks_root, fstripe_start); | |
448 | mutex_unlock(&locks_root->lock); | |
449 | if (IS_ERR(existing)) { | |
450 | ret = PTR_ERR(existing); | |
451 | goto out; | |
452 | } | |
453 | mutex_lock(&existing->mutex); | |
454 | *locked_ret = true; | |
455 | out: | |
456 | btrfs_put_block_group(bg_cache); | |
457 | return ret; | |
458 | } | |
459 | ||
460 | /* | |
461 | * Unlock a full stripe. | |
462 | * | |
463 | * NOTE: Caller must ensure it's the same context calling corresponding | |
464 | * lock_full_stripe(). | |
465 | * | |
466 | * Return 0 if we unlock full stripe without problem. | |
467 | * Return <0 for error | |
468 | */ | |
469 | static int unlock_full_stripe(struct btrfs_fs_info *fs_info, u64 bytenr, | |
470 | bool locked) | |
471 | { | |
472 | struct btrfs_block_group_cache *bg_cache; | |
473 | struct btrfs_full_stripe_locks_tree *locks_root; | |
474 | struct full_stripe_lock *fstripe_lock; | |
475 | u64 fstripe_start; | |
476 | bool freeit = false; | |
477 | int ret = 0; | |
478 | ||
479 | /* If we didn't acquire full stripe lock, no need to continue */ | |
480 | if (!locked) | |
481 | return 0; | |
482 | ||
483 | bg_cache = btrfs_lookup_block_group(fs_info, bytenr); | |
484 | if (!bg_cache) { | |
485 | ASSERT(0); | |
486 | return -ENOENT; | |
487 | } | |
488 | if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_RAID56_MASK)) | |
489 | goto out; | |
490 | ||
491 | locks_root = &bg_cache->full_stripe_locks_root; | |
492 | fstripe_start = get_full_stripe_logical(bg_cache, bytenr); | |
493 | ||
494 | mutex_lock(&locks_root->lock); | |
495 | fstripe_lock = search_full_stripe_lock(locks_root, fstripe_start); | |
496 | /* Unpaired unlock_full_stripe() detected */ | |
497 | if (!fstripe_lock) { | |
498 | WARN_ON(1); | |
499 | ret = -ENOENT; | |
500 | mutex_unlock(&locks_root->lock); | |
501 | goto out; | |
502 | } | |
503 | ||
504 | if (fstripe_lock->refs == 0) { | |
505 | WARN_ON(1); | |
506 | btrfs_warn(fs_info, "full stripe lock at %llu refcount underflow", | |
507 | fstripe_lock->logical); | |
508 | } else { | |
509 | fstripe_lock->refs--; | |
510 | } | |
511 | ||
512 | if (fstripe_lock->refs == 0) { | |
513 | rb_erase(&fstripe_lock->node, &locks_root->root); | |
514 | freeit = true; | |
515 | } | |
516 | mutex_unlock(&locks_root->lock); | |
517 | ||
518 | mutex_unlock(&fstripe_lock->mutex); | |
519 | if (freeit) | |
520 | kfree(fstripe_lock); | |
521 | out: | |
522 | btrfs_put_block_group(bg_cache); | |
523 | return ret; | |
524 | } | |
525 | ||
d9d181c1 | 526 | static void scrub_free_csums(struct scrub_ctx *sctx) |
a2de733c | 527 | { |
d9d181c1 | 528 | while (!list_empty(&sctx->csum_list)) { |
a2de733c | 529 | struct btrfs_ordered_sum *sum; |
d9d181c1 | 530 | sum = list_first_entry(&sctx->csum_list, |
a2de733c AJ |
531 | struct btrfs_ordered_sum, list); |
532 | list_del(&sum->list); | |
533 | kfree(sum); | |
534 | } | |
535 | } | |
536 | ||
d9d181c1 | 537 | static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) |
a2de733c AJ |
538 | { |
539 | int i; | |
a2de733c | 540 | |
d9d181c1 | 541 | if (!sctx) |
a2de733c AJ |
542 | return; |
543 | ||
b5d67f64 | 544 | /* this can happen when scrub is cancelled */ |
d9d181c1 SB |
545 | if (sctx->curr != -1) { |
546 | struct scrub_bio *sbio = sctx->bios[sctx->curr]; | |
b5d67f64 SB |
547 | |
548 | for (i = 0; i < sbio->page_count; i++) { | |
ff023aac | 549 | WARN_ON(!sbio->pagev[i]->page); |
b5d67f64 SB |
550 | scrub_block_put(sbio->pagev[i]->sblock); |
551 | } | |
552 | bio_put(sbio->bio); | |
553 | } | |
554 | ||
ff023aac | 555 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
d9d181c1 | 556 | struct scrub_bio *sbio = sctx->bios[i]; |
a2de733c AJ |
557 | |
558 | if (!sbio) | |
559 | break; | |
a2de733c AJ |
560 | kfree(sbio); |
561 | } | |
562 | ||
3fb99303 | 563 | kfree(sctx->wr_curr_bio); |
d9d181c1 SB |
564 | scrub_free_csums(sctx); |
565 | kfree(sctx); | |
a2de733c AJ |
566 | } |
567 | ||
f55985f4 FM |
568 | static void scrub_put_ctx(struct scrub_ctx *sctx) |
569 | { | |
99f4cdb1 | 570 | if (refcount_dec_and_test(&sctx->refs)) |
f55985f4 FM |
571 | scrub_free_ctx(sctx); |
572 | } | |
573 | ||
92f7ba43 DS |
574 | static noinline_for_stack struct scrub_ctx *scrub_setup_ctx( |
575 | struct btrfs_fs_info *fs_info, int is_dev_replace) | |
a2de733c | 576 | { |
d9d181c1 | 577 | struct scrub_ctx *sctx; |
a2de733c | 578 | int i; |
a2de733c | 579 | |
58c4e173 | 580 | sctx = kzalloc(sizeof(*sctx), GFP_KERNEL); |
d9d181c1 | 581 | if (!sctx) |
a2de733c | 582 | goto nomem; |
99f4cdb1 | 583 | refcount_set(&sctx->refs, 1); |
63a212ab | 584 | sctx->is_dev_replace = is_dev_replace; |
b54ffb73 | 585 | sctx->pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; |
d9d181c1 | 586 | sctx->curr = -1; |
92f7ba43 | 587 | sctx->fs_info = fs_info; |
e49be14b | 588 | INIT_LIST_HEAD(&sctx->csum_list); |
ff023aac | 589 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
a2de733c AJ |
590 | struct scrub_bio *sbio; |
591 | ||
58c4e173 | 592 | sbio = kzalloc(sizeof(*sbio), GFP_KERNEL); |
a2de733c AJ |
593 | if (!sbio) |
594 | goto nomem; | |
d9d181c1 | 595 | sctx->bios[i] = sbio; |
a2de733c | 596 | |
a2de733c | 597 | sbio->index = i; |
d9d181c1 | 598 | sbio->sctx = sctx; |
b5d67f64 | 599 | sbio->page_count = 0; |
9e0af237 LB |
600 | btrfs_init_work(&sbio->work, btrfs_scrub_helper, |
601 | scrub_bio_end_io_worker, NULL, NULL); | |
a2de733c | 602 | |
ff023aac | 603 | if (i != SCRUB_BIOS_PER_SCTX - 1) |
d9d181c1 | 604 | sctx->bios[i]->next_free = i + 1; |
0ef8e451 | 605 | else |
d9d181c1 SB |
606 | sctx->bios[i]->next_free = -1; |
607 | } | |
608 | sctx->first_free = 0; | |
b6bfebc1 SB |
609 | atomic_set(&sctx->bios_in_flight, 0); |
610 | atomic_set(&sctx->workers_pending, 0); | |
d9d181c1 SB |
611 | atomic_set(&sctx->cancel_req, 0); |
612 | sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
d9d181c1 SB |
613 | |
614 | spin_lock_init(&sctx->list_lock); | |
615 | spin_lock_init(&sctx->stat_lock); | |
616 | init_waitqueue_head(&sctx->list_wait); | |
ff023aac | 617 | |
3fb99303 DS |
618 | WARN_ON(sctx->wr_curr_bio != NULL); |
619 | mutex_init(&sctx->wr_lock); | |
620 | sctx->wr_curr_bio = NULL; | |
8fcdac3f | 621 | if (is_dev_replace) { |
ded56184 | 622 | WARN_ON(!fs_info->dev_replace.tgtdev); |
3fb99303 | 623 | sctx->pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO; |
ded56184 | 624 | sctx->wr_tgtdev = fs_info->dev_replace.tgtdev; |
2073c4c2 | 625 | sctx->flush_all_writes = false; |
ff023aac | 626 | } |
8fcdac3f | 627 | |
d9d181c1 | 628 | return sctx; |
a2de733c AJ |
629 | |
630 | nomem: | |
d9d181c1 | 631 | scrub_free_ctx(sctx); |
a2de733c AJ |
632 | return ERR_PTR(-ENOMEM); |
633 | } | |
634 | ||
ff023aac SB |
635 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, |
636 | void *warn_ctx) | |
558540c1 JS |
637 | { |
638 | u64 isize; | |
639 | u32 nlink; | |
640 | int ret; | |
641 | int i; | |
de2491fd | 642 | unsigned nofs_flag; |
558540c1 JS |
643 | struct extent_buffer *eb; |
644 | struct btrfs_inode_item *inode_item; | |
ff023aac | 645 | struct scrub_warning *swarn = warn_ctx; |
fb456252 | 646 | struct btrfs_fs_info *fs_info = swarn->dev->fs_info; |
558540c1 JS |
647 | struct inode_fs_paths *ipath = NULL; |
648 | struct btrfs_root *local_root; | |
649 | struct btrfs_key root_key; | |
1d4c08e0 | 650 | struct btrfs_key key; |
558540c1 JS |
651 | |
652 | root_key.objectid = root; | |
653 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
654 | root_key.offset = (u64)-1; | |
655 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
656 | if (IS_ERR(local_root)) { | |
657 | ret = PTR_ERR(local_root); | |
658 | goto err; | |
659 | } | |
660 | ||
14692cc1 DS |
661 | /* |
662 | * this makes the path point to (inum INODE_ITEM ioff) | |
663 | */ | |
1d4c08e0 DS |
664 | key.objectid = inum; |
665 | key.type = BTRFS_INODE_ITEM_KEY; | |
666 | key.offset = 0; | |
667 | ||
668 | ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0); | |
558540c1 JS |
669 | if (ret) { |
670 | btrfs_release_path(swarn->path); | |
671 | goto err; | |
672 | } | |
673 | ||
674 | eb = swarn->path->nodes[0]; | |
675 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], | |
676 | struct btrfs_inode_item); | |
677 | isize = btrfs_inode_size(eb, inode_item); | |
678 | nlink = btrfs_inode_nlink(eb, inode_item); | |
679 | btrfs_release_path(swarn->path); | |
680 | ||
de2491fd DS |
681 | /* |
682 | * init_path might indirectly call vmalloc, or use GFP_KERNEL. Scrub | |
683 | * uses GFP_NOFS in this context, so we keep it consistent but it does | |
684 | * not seem to be strictly necessary. | |
685 | */ | |
686 | nofs_flag = memalloc_nofs_save(); | |
558540c1 | 687 | ipath = init_ipath(4096, local_root, swarn->path); |
de2491fd | 688 | memalloc_nofs_restore(nofs_flag); |
26bdef54 DC |
689 | if (IS_ERR(ipath)) { |
690 | ret = PTR_ERR(ipath); | |
691 | ipath = NULL; | |
692 | goto err; | |
693 | } | |
558540c1 JS |
694 | ret = paths_from_inode(inum, ipath); |
695 | ||
696 | if (ret < 0) | |
697 | goto err; | |
698 | ||
699 | /* | |
700 | * we deliberately ignore the bit ipath might have been too small to | |
701 | * hold all of the paths here | |
702 | */ | |
703 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) | |
5d163e0e | 704 | btrfs_warn_in_rcu(fs_info, |
6aa21263 | 705 | "%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu, length %llu, links %u (path: %s)", |
5d163e0e JM |
706 | swarn->errstr, swarn->logical, |
707 | rcu_str_deref(swarn->dev->name), | |
6aa21263 | 708 | swarn->physical, |
5d163e0e JM |
709 | root, inum, offset, |
710 | min(isize - offset, (u64)PAGE_SIZE), nlink, | |
711 | (char *)(unsigned long)ipath->fspath->val[i]); | |
558540c1 JS |
712 | |
713 | free_ipath(ipath); | |
714 | return 0; | |
715 | ||
716 | err: | |
5d163e0e | 717 | btrfs_warn_in_rcu(fs_info, |
6aa21263 | 718 | "%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu: path resolving failed with ret=%d", |
5d163e0e JM |
719 | swarn->errstr, swarn->logical, |
720 | rcu_str_deref(swarn->dev->name), | |
6aa21263 | 721 | swarn->physical, |
5d163e0e | 722 | root, inum, offset, ret); |
558540c1 JS |
723 | |
724 | free_ipath(ipath); | |
725 | return 0; | |
726 | } | |
727 | ||
b5d67f64 | 728 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
558540c1 | 729 | { |
a36cf8b8 SB |
730 | struct btrfs_device *dev; |
731 | struct btrfs_fs_info *fs_info; | |
558540c1 JS |
732 | struct btrfs_path *path; |
733 | struct btrfs_key found_key; | |
734 | struct extent_buffer *eb; | |
735 | struct btrfs_extent_item *ei; | |
736 | struct scrub_warning swarn; | |
69917e43 LB |
737 | unsigned long ptr = 0; |
738 | u64 extent_item_pos; | |
739 | u64 flags = 0; | |
558540c1 | 740 | u64 ref_root; |
69917e43 | 741 | u32 item_size; |
07c9a8e0 | 742 | u8 ref_level = 0; |
69917e43 | 743 | int ret; |
558540c1 | 744 | |
a36cf8b8 | 745 | WARN_ON(sblock->page_count < 1); |
7a9e9987 | 746 | dev = sblock->pagev[0]->dev; |
fb456252 | 747 | fs_info = sblock->sctx->fs_info; |
a36cf8b8 | 748 | |
558540c1 | 749 | path = btrfs_alloc_path(); |
8b9456da DS |
750 | if (!path) |
751 | return; | |
558540c1 | 752 | |
6aa21263 | 753 | swarn.physical = sblock->pagev[0]->physical; |
7a9e9987 | 754 | swarn.logical = sblock->pagev[0]->logical; |
558540c1 | 755 | swarn.errstr = errstr; |
a36cf8b8 | 756 | swarn.dev = NULL; |
558540c1 | 757 | |
69917e43 LB |
758 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, |
759 | &flags); | |
558540c1 JS |
760 | if (ret < 0) |
761 | goto out; | |
762 | ||
4692cf58 | 763 | extent_item_pos = swarn.logical - found_key.objectid; |
558540c1 JS |
764 | swarn.extent_item_size = found_key.offset; |
765 | ||
766 | eb = path->nodes[0]; | |
767 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); | |
768 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
769 | ||
69917e43 | 770 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
558540c1 | 771 | do { |
6eda71d0 LB |
772 | ret = tree_backref_for_extent(&ptr, eb, &found_key, ei, |
773 | item_size, &ref_root, | |
774 | &ref_level); | |
ecaeb14b | 775 | btrfs_warn_in_rcu(fs_info, |
6aa21263 | 776 | "%s at logical %llu on dev %s, physical %llu: metadata %s (level %d) in tree %llu", |
5d163e0e | 777 | errstr, swarn.logical, |
606686ee | 778 | rcu_str_deref(dev->name), |
6aa21263 | 779 | swarn.physical, |
558540c1 JS |
780 | ref_level ? "node" : "leaf", |
781 | ret < 0 ? -1 : ref_level, | |
782 | ret < 0 ? -1 : ref_root); | |
783 | } while (ret != 1); | |
d8fe29e9 | 784 | btrfs_release_path(path); |
558540c1 | 785 | } else { |
d8fe29e9 | 786 | btrfs_release_path(path); |
558540c1 | 787 | swarn.path = path; |
a36cf8b8 | 788 | swarn.dev = dev; |
7a3ae2f8 JS |
789 | iterate_extent_inodes(fs_info, found_key.objectid, |
790 | extent_item_pos, 1, | |
c995ab3c | 791 | scrub_print_warning_inode, &swarn, false); |
558540c1 JS |
792 | } |
793 | ||
794 | out: | |
795 | btrfs_free_path(path); | |
558540c1 JS |
796 | } |
797 | ||
af8e2d1d MX |
798 | static inline void scrub_get_recover(struct scrub_recover *recover) |
799 | { | |
6f615018 | 800 | refcount_inc(&recover->refs); |
af8e2d1d MX |
801 | } |
802 | ||
e501bfe3 QW |
803 | static inline void scrub_put_recover(struct btrfs_fs_info *fs_info, |
804 | struct scrub_recover *recover) | |
af8e2d1d | 805 | { |
6f615018 | 806 | if (refcount_dec_and_test(&recover->refs)) { |
e501bfe3 | 807 | btrfs_bio_counter_dec(fs_info); |
6e9606d2 | 808 | btrfs_put_bbio(recover->bbio); |
af8e2d1d MX |
809 | kfree(recover); |
810 | } | |
811 | } | |
812 | ||
a2de733c | 813 | /* |
b5d67f64 SB |
814 | * scrub_handle_errored_block gets called when either verification of the |
815 | * pages failed or the bio failed to read, e.g. with EIO. In the latter | |
816 | * case, this function handles all pages in the bio, even though only one | |
817 | * may be bad. | |
818 | * The goal of this function is to repair the errored block by using the | |
819 | * contents of one of the mirrors. | |
a2de733c | 820 | */ |
b5d67f64 | 821 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
a2de733c | 822 | { |
d9d181c1 | 823 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
a36cf8b8 | 824 | struct btrfs_device *dev; |
b5d67f64 | 825 | struct btrfs_fs_info *fs_info; |
b5d67f64 | 826 | u64 logical; |
b5d67f64 SB |
827 | unsigned int failed_mirror_index; |
828 | unsigned int is_metadata; | |
829 | unsigned int have_csum; | |
b5d67f64 SB |
830 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ |
831 | struct scrub_block *sblock_bad; | |
832 | int ret; | |
833 | int mirror_index; | |
834 | int page_num; | |
835 | int success; | |
28d70e23 | 836 | bool full_stripe_locked; |
7c3c7cb9 | 837 | unsigned int nofs_flag; |
558540c1 | 838 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
b5d67f64 SB |
839 | DEFAULT_RATELIMIT_BURST); |
840 | ||
841 | BUG_ON(sblock_to_check->page_count < 1); | |
fb456252 | 842 | fs_info = sctx->fs_info; |
4ded4f63 SB |
843 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
844 | /* | |
845 | * if we find an error in a super block, we just report it. | |
846 | * They will get written with the next transaction commit | |
847 | * anyway | |
848 | */ | |
849 | spin_lock(&sctx->stat_lock); | |
850 | ++sctx->stat.super_errors; | |
851 | spin_unlock(&sctx->stat_lock); | |
852 | return 0; | |
853 | } | |
7a9e9987 | 854 | logical = sblock_to_check->pagev[0]->logical; |
7a9e9987 SB |
855 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); |
856 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; | |
857 | is_metadata = !(sblock_to_check->pagev[0]->flags & | |
b5d67f64 | 858 | BTRFS_EXTENT_FLAG_DATA); |
7a9e9987 | 859 | have_csum = sblock_to_check->pagev[0]->have_csum; |
7a9e9987 | 860 | dev = sblock_to_check->pagev[0]->dev; |
13db62b7 | 861 | |
7c3c7cb9 FM |
862 | /* |
863 | * We must use GFP_NOFS because the scrub task might be waiting for a | |
864 | * worker task executing this function and in turn a transaction commit | |
865 | * might be waiting the scrub task to pause (which needs to wait for all | |
866 | * the worker tasks to complete before pausing). | |
867 | * We do allocations in the workers through insert_full_stripe_lock() | |
868 | * and scrub_add_page_to_wr_bio(), which happens down the call chain of | |
869 | * this function. | |
870 | */ | |
871 | nofs_flag = memalloc_nofs_save(); | |
28d70e23 QW |
872 | /* |
873 | * For RAID5/6, race can happen for a different device scrub thread. | |
874 | * For data corruption, Parity and Data threads will both try | |
875 | * to recovery the data. | |
876 | * Race can lead to doubly added csum error, or even unrecoverable | |
877 | * error. | |
878 | */ | |
879 | ret = lock_full_stripe(fs_info, logical, &full_stripe_locked); | |
880 | if (ret < 0) { | |
7c3c7cb9 | 881 | memalloc_nofs_restore(nofs_flag); |
28d70e23 QW |
882 | spin_lock(&sctx->stat_lock); |
883 | if (ret == -ENOMEM) | |
884 | sctx->stat.malloc_errors++; | |
885 | sctx->stat.read_errors++; | |
886 | sctx->stat.uncorrectable_errors++; | |
887 | spin_unlock(&sctx->stat_lock); | |
888 | return ret; | |
889 | } | |
890 | ||
b5d67f64 SB |
891 | /* |
892 | * read all mirrors one after the other. This includes to | |
893 | * re-read the extent or metadata block that failed (that was | |
894 | * the cause that this fixup code is called) another time, | |
895 | * page by page this time in order to know which pages | |
896 | * caused I/O errors and which ones are good (for all mirrors). | |
897 | * It is the goal to handle the situation when more than one | |
898 | * mirror contains I/O errors, but the errors do not | |
899 | * overlap, i.e. the data can be repaired by selecting the | |
900 | * pages from those mirrors without I/O error on the | |
901 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) | |
902 | * would be that mirror #1 has an I/O error on the first page, | |
903 | * the second page is good, and mirror #2 has an I/O error on | |
904 | * the second page, but the first page is good. | |
905 | * Then the first page of the first mirror can be repaired by | |
906 | * taking the first page of the second mirror, and the | |
907 | * second page of the second mirror can be repaired by | |
908 | * copying the contents of the 2nd page of the 1st mirror. | |
909 | * One more note: if the pages of one mirror contain I/O | |
910 | * errors, the checksum cannot be verified. In order to get | |
911 | * the best data for repairing, the first attempt is to find | |
912 | * a mirror without I/O errors and with a validated checksum. | |
913 | * Only if this is not possible, the pages are picked from | |
914 | * mirrors with I/O errors without considering the checksum. | |
915 | * If the latter is the case, at the end, the checksum of the | |
916 | * repaired area is verified in order to correctly maintain | |
917 | * the statistics. | |
918 | */ | |
919 | ||
31e818fe | 920 | sblocks_for_recheck = kcalloc(BTRFS_MAX_MIRRORS, |
7c3c7cb9 | 921 | sizeof(*sblocks_for_recheck), GFP_KERNEL); |
b5d67f64 | 922 | if (!sblocks_for_recheck) { |
d9d181c1 SB |
923 | spin_lock(&sctx->stat_lock); |
924 | sctx->stat.malloc_errors++; | |
925 | sctx->stat.read_errors++; | |
926 | sctx->stat.uncorrectable_errors++; | |
927 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 928 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 929 | goto out; |
a2de733c AJ |
930 | } |
931 | ||
b5d67f64 | 932 | /* setup the context, map the logical blocks and alloc the pages */ |
be50a8dd | 933 | ret = scrub_setup_recheck_block(sblock_to_check, sblocks_for_recheck); |
b5d67f64 | 934 | if (ret) { |
d9d181c1 SB |
935 | spin_lock(&sctx->stat_lock); |
936 | sctx->stat.read_errors++; | |
937 | sctx->stat.uncorrectable_errors++; | |
938 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 939 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 SB |
940 | goto out; |
941 | } | |
942 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); | |
943 | sblock_bad = sblocks_for_recheck + failed_mirror_index; | |
13db62b7 | 944 | |
b5d67f64 | 945 | /* build and submit the bios for the failed mirror, check checksums */ |
affe4a5a | 946 | scrub_recheck_block(fs_info, sblock_bad, 1); |
a2de733c | 947 | |
b5d67f64 SB |
948 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
949 | sblock_bad->no_io_error_seen) { | |
950 | /* | |
951 | * the error disappeared after reading page by page, or | |
952 | * the area was part of a huge bio and other parts of the | |
953 | * bio caused I/O errors, or the block layer merged several | |
954 | * read requests into one and the error is caused by a | |
955 | * different bio (usually one of the two latter cases is | |
956 | * the cause) | |
957 | */ | |
d9d181c1 SB |
958 | spin_lock(&sctx->stat_lock); |
959 | sctx->stat.unverified_errors++; | |
5a6ac9ea | 960 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 961 | spin_unlock(&sctx->stat_lock); |
a2de733c | 962 | |
ff023aac SB |
963 | if (sctx->is_dev_replace) |
964 | scrub_write_block_to_dev_replace(sblock_bad); | |
b5d67f64 | 965 | goto out; |
a2de733c | 966 | } |
a2de733c | 967 | |
b5d67f64 | 968 | if (!sblock_bad->no_io_error_seen) { |
d9d181c1 SB |
969 | spin_lock(&sctx->stat_lock); |
970 | sctx->stat.read_errors++; | |
971 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
972 | if (__ratelimit(&_rs)) |
973 | scrub_print_warning("i/o error", sblock_to_check); | |
a36cf8b8 | 974 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 975 | } else if (sblock_bad->checksum_error) { |
d9d181c1 SB |
976 | spin_lock(&sctx->stat_lock); |
977 | sctx->stat.csum_errors++; | |
978 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
979 | if (__ratelimit(&_rs)) |
980 | scrub_print_warning("checksum error", sblock_to_check); | |
a36cf8b8 | 981 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 982 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 983 | } else if (sblock_bad->header_error) { |
d9d181c1 SB |
984 | spin_lock(&sctx->stat_lock); |
985 | sctx->stat.verify_errors++; | |
986 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
987 | if (__ratelimit(&_rs)) |
988 | scrub_print_warning("checksum/header error", | |
989 | sblock_to_check); | |
442a4f63 | 990 | if (sblock_bad->generation_error) |
a36cf8b8 | 991 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 SB |
992 | BTRFS_DEV_STAT_GENERATION_ERRS); |
993 | else | |
a36cf8b8 | 994 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 995 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 996 | } |
a2de733c | 997 | |
33ef30ad ID |
998 | if (sctx->readonly) { |
999 | ASSERT(!sctx->is_dev_replace); | |
1000 | goto out; | |
1001 | } | |
a2de733c | 1002 | |
b5d67f64 SB |
1003 | /* |
1004 | * now build and submit the bios for the other mirrors, check | |
cb2ced73 SB |
1005 | * checksums. |
1006 | * First try to pick the mirror which is completely without I/O | |
b5d67f64 SB |
1007 | * errors and also does not have a checksum error. |
1008 | * If one is found, and if a checksum is present, the full block | |
1009 | * that is known to contain an error is rewritten. Afterwards | |
1010 | * the block is known to be corrected. | |
1011 | * If a mirror is found which is completely correct, and no | |
1012 | * checksum is present, only those pages are rewritten that had | |
1013 | * an I/O error in the block to be repaired, since it cannot be | |
1014 | * determined, which copy of the other pages is better (and it | |
1015 | * could happen otherwise that a correct page would be | |
1016 | * overwritten by a bad one). | |
1017 | */ | |
762221f0 | 1018 | for (mirror_index = 0; ;mirror_index++) { |
cb2ced73 | 1019 | struct scrub_block *sblock_other; |
b5d67f64 | 1020 | |
cb2ced73 SB |
1021 | if (mirror_index == failed_mirror_index) |
1022 | continue; | |
762221f0 LB |
1023 | |
1024 | /* raid56's mirror can be more than BTRFS_MAX_MIRRORS */ | |
1025 | if (!scrub_is_page_on_raid56(sblock_bad->pagev[0])) { | |
1026 | if (mirror_index >= BTRFS_MAX_MIRRORS) | |
1027 | break; | |
1028 | if (!sblocks_for_recheck[mirror_index].page_count) | |
1029 | break; | |
1030 | ||
1031 | sblock_other = sblocks_for_recheck + mirror_index; | |
1032 | } else { | |
1033 | struct scrub_recover *r = sblock_bad->pagev[0]->recover; | |
1034 | int max_allowed = r->bbio->num_stripes - | |
1035 | r->bbio->num_tgtdevs; | |
1036 | ||
1037 | if (mirror_index >= max_allowed) | |
1038 | break; | |
1039 | if (!sblocks_for_recheck[1].page_count) | |
1040 | break; | |
1041 | ||
1042 | ASSERT(failed_mirror_index == 0); | |
1043 | sblock_other = sblocks_for_recheck + 1; | |
1044 | sblock_other->pagev[0]->mirror_num = 1 + mirror_index; | |
1045 | } | |
cb2ced73 SB |
1046 | |
1047 | /* build and submit the bios, check checksums */ | |
affe4a5a | 1048 | scrub_recheck_block(fs_info, sblock_other, 0); |
34f5c8e9 SB |
1049 | |
1050 | if (!sblock_other->header_error && | |
b5d67f64 SB |
1051 | !sblock_other->checksum_error && |
1052 | sblock_other->no_io_error_seen) { | |
ff023aac SB |
1053 | if (sctx->is_dev_replace) { |
1054 | scrub_write_block_to_dev_replace(sblock_other); | |
114ab50d | 1055 | goto corrected_error; |
ff023aac | 1056 | } else { |
ff023aac | 1057 | ret = scrub_repair_block_from_good_copy( |
114ab50d ZL |
1058 | sblock_bad, sblock_other); |
1059 | if (!ret) | |
1060 | goto corrected_error; | |
ff023aac | 1061 | } |
b5d67f64 SB |
1062 | } |
1063 | } | |
a2de733c | 1064 | |
b968fed1 ZL |
1065 | if (sblock_bad->no_io_error_seen && !sctx->is_dev_replace) |
1066 | goto did_not_correct_error; | |
ff023aac SB |
1067 | |
1068 | /* | |
ff023aac | 1069 | * In case of I/O errors in the area that is supposed to be |
b5d67f64 SB |
1070 | * repaired, continue by picking good copies of those pages. |
1071 | * Select the good pages from mirrors to rewrite bad pages from | |
1072 | * the area to fix. Afterwards verify the checksum of the block | |
1073 | * that is supposed to be repaired. This verification step is | |
1074 | * only done for the purpose of statistic counting and for the | |
1075 | * final scrub report, whether errors remain. | |
1076 | * A perfect algorithm could make use of the checksum and try | |
1077 | * all possible combinations of pages from the different mirrors | |
1078 | * until the checksum verification succeeds. For example, when | |
1079 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page | |
1080 | * of mirror #2 is readable but the final checksum test fails, | |
1081 | * then the 2nd page of mirror #3 could be tried, whether now | |
01327610 | 1082 | * the final checksum succeeds. But this would be a rare |
b5d67f64 SB |
1083 | * exception and is therefore not implemented. At least it is |
1084 | * avoided that the good copy is overwritten. | |
1085 | * A more useful improvement would be to pick the sectors | |
1086 | * without I/O error based on sector sizes (512 bytes on legacy | |
1087 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one | |
1088 | * mirror could be repaired by taking 512 byte of a different | |
1089 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE | |
1090 | * area are unreadable. | |
a2de733c | 1091 | */ |
b5d67f64 | 1092 | success = 1; |
b968fed1 ZL |
1093 | for (page_num = 0; page_num < sblock_bad->page_count; |
1094 | page_num++) { | |
7a9e9987 | 1095 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
b968fed1 | 1096 | struct scrub_block *sblock_other = NULL; |
b5d67f64 | 1097 | |
b968fed1 ZL |
1098 | /* skip no-io-error page in scrub */ |
1099 | if (!page_bad->io_error && !sctx->is_dev_replace) | |
a2de733c | 1100 | continue; |
b5d67f64 | 1101 | |
4759700a LB |
1102 | if (scrub_is_page_on_raid56(sblock_bad->pagev[0])) { |
1103 | /* | |
1104 | * In case of dev replace, if raid56 rebuild process | |
1105 | * didn't work out correct data, then copy the content | |
1106 | * in sblock_bad to make sure target device is identical | |
1107 | * to source device, instead of writing garbage data in | |
1108 | * sblock_for_recheck array to target device. | |
1109 | */ | |
1110 | sblock_other = NULL; | |
1111 | } else if (page_bad->io_error) { | |
1112 | /* try to find no-io-error page in mirrors */ | |
b968fed1 ZL |
1113 | for (mirror_index = 0; |
1114 | mirror_index < BTRFS_MAX_MIRRORS && | |
1115 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1116 | mirror_index++) { | |
1117 | if (!sblocks_for_recheck[mirror_index]. | |
1118 | pagev[page_num]->io_error) { | |
1119 | sblock_other = sblocks_for_recheck + | |
1120 | mirror_index; | |
1121 | break; | |
b5d67f64 SB |
1122 | } |
1123 | } | |
b968fed1 ZL |
1124 | if (!sblock_other) |
1125 | success = 0; | |
96e36920 | 1126 | } |
a2de733c | 1127 | |
b968fed1 ZL |
1128 | if (sctx->is_dev_replace) { |
1129 | /* | |
1130 | * did not find a mirror to fetch the page | |
1131 | * from. scrub_write_page_to_dev_replace() | |
1132 | * handles this case (page->io_error), by | |
1133 | * filling the block with zeros before | |
1134 | * submitting the write request | |
1135 | */ | |
1136 | if (!sblock_other) | |
1137 | sblock_other = sblock_bad; | |
1138 | ||
1139 | if (scrub_write_page_to_dev_replace(sblock_other, | |
1140 | page_num) != 0) { | |
e37abe97 | 1141 | atomic64_inc( |
0b246afa | 1142 | &fs_info->dev_replace.num_write_errors); |
b968fed1 ZL |
1143 | success = 0; |
1144 | } | |
1145 | } else if (sblock_other) { | |
1146 | ret = scrub_repair_page_from_good_copy(sblock_bad, | |
1147 | sblock_other, | |
1148 | page_num, 0); | |
1149 | if (0 == ret) | |
1150 | page_bad->io_error = 0; | |
1151 | else | |
1152 | success = 0; | |
b5d67f64 | 1153 | } |
a2de733c | 1154 | } |
a2de733c | 1155 | |
b968fed1 | 1156 | if (success && !sctx->is_dev_replace) { |
b5d67f64 SB |
1157 | if (is_metadata || have_csum) { |
1158 | /* | |
1159 | * need to verify the checksum now that all | |
1160 | * sectors on disk are repaired (the write | |
1161 | * request for data to be repaired is on its way). | |
1162 | * Just be lazy and use scrub_recheck_block() | |
1163 | * which re-reads the data before the checksum | |
1164 | * is verified, but most likely the data comes out | |
1165 | * of the page cache. | |
1166 | */ | |
affe4a5a | 1167 | scrub_recheck_block(fs_info, sblock_bad, 1); |
34f5c8e9 | 1168 | if (!sblock_bad->header_error && |
b5d67f64 SB |
1169 | !sblock_bad->checksum_error && |
1170 | sblock_bad->no_io_error_seen) | |
1171 | goto corrected_error; | |
1172 | else | |
1173 | goto did_not_correct_error; | |
1174 | } else { | |
1175 | corrected_error: | |
d9d181c1 SB |
1176 | spin_lock(&sctx->stat_lock); |
1177 | sctx->stat.corrected_errors++; | |
5a6ac9ea | 1178 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 1179 | spin_unlock(&sctx->stat_lock); |
b14af3b4 DS |
1180 | btrfs_err_rl_in_rcu(fs_info, |
1181 | "fixed up error at logical %llu on dev %s", | |
c1c9ff7c | 1182 | logical, rcu_str_deref(dev->name)); |
8628764e | 1183 | } |
b5d67f64 SB |
1184 | } else { |
1185 | did_not_correct_error: | |
d9d181c1 SB |
1186 | spin_lock(&sctx->stat_lock); |
1187 | sctx->stat.uncorrectable_errors++; | |
1188 | spin_unlock(&sctx->stat_lock); | |
b14af3b4 DS |
1189 | btrfs_err_rl_in_rcu(fs_info, |
1190 | "unable to fixup (regular) error at logical %llu on dev %s", | |
c1c9ff7c | 1191 | logical, rcu_str_deref(dev->name)); |
96e36920 | 1192 | } |
a2de733c | 1193 | |
b5d67f64 SB |
1194 | out: |
1195 | if (sblocks_for_recheck) { | |
1196 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; | |
1197 | mirror_index++) { | |
1198 | struct scrub_block *sblock = sblocks_for_recheck + | |
1199 | mirror_index; | |
af8e2d1d | 1200 | struct scrub_recover *recover; |
b5d67f64 SB |
1201 | int page_index; |
1202 | ||
7a9e9987 SB |
1203 | for (page_index = 0; page_index < sblock->page_count; |
1204 | page_index++) { | |
1205 | sblock->pagev[page_index]->sblock = NULL; | |
af8e2d1d MX |
1206 | recover = sblock->pagev[page_index]->recover; |
1207 | if (recover) { | |
e501bfe3 | 1208 | scrub_put_recover(fs_info, recover); |
af8e2d1d MX |
1209 | sblock->pagev[page_index]->recover = |
1210 | NULL; | |
1211 | } | |
7a9e9987 SB |
1212 | scrub_page_put(sblock->pagev[page_index]); |
1213 | } | |
b5d67f64 SB |
1214 | } |
1215 | kfree(sblocks_for_recheck); | |
1216 | } | |
a2de733c | 1217 | |
28d70e23 | 1218 | ret = unlock_full_stripe(fs_info, logical, full_stripe_locked); |
7c3c7cb9 | 1219 | memalloc_nofs_restore(nofs_flag); |
28d70e23 QW |
1220 | if (ret < 0) |
1221 | return ret; | |
b5d67f64 SB |
1222 | return 0; |
1223 | } | |
a2de733c | 1224 | |
8e5cfb55 | 1225 | static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio) |
af8e2d1d | 1226 | { |
10f11900 ZL |
1227 | if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5) |
1228 | return 2; | |
1229 | else if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID6) | |
1230 | return 3; | |
1231 | else | |
af8e2d1d | 1232 | return (int)bbio->num_stripes; |
af8e2d1d MX |
1233 | } |
1234 | ||
10f11900 ZL |
1235 | static inline void scrub_stripe_index_and_offset(u64 logical, u64 map_type, |
1236 | u64 *raid_map, | |
af8e2d1d MX |
1237 | u64 mapped_length, |
1238 | int nstripes, int mirror, | |
1239 | int *stripe_index, | |
1240 | u64 *stripe_offset) | |
1241 | { | |
1242 | int i; | |
1243 | ||
ffe2d203 | 1244 | if (map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
af8e2d1d MX |
1245 | /* RAID5/6 */ |
1246 | for (i = 0; i < nstripes; i++) { | |
1247 | if (raid_map[i] == RAID6_Q_STRIPE || | |
1248 | raid_map[i] == RAID5_P_STRIPE) | |
1249 | continue; | |
1250 | ||
1251 | if (logical >= raid_map[i] && | |
1252 | logical < raid_map[i] + mapped_length) | |
1253 | break; | |
1254 | } | |
1255 | ||
1256 | *stripe_index = i; | |
1257 | *stripe_offset = logical - raid_map[i]; | |
1258 | } else { | |
1259 | /* The other RAID type */ | |
1260 | *stripe_index = mirror; | |
1261 | *stripe_offset = 0; | |
1262 | } | |
1263 | } | |
1264 | ||
be50a8dd | 1265 | static int scrub_setup_recheck_block(struct scrub_block *original_sblock, |
b5d67f64 SB |
1266 | struct scrub_block *sblocks_for_recheck) |
1267 | { | |
be50a8dd | 1268 | struct scrub_ctx *sctx = original_sblock->sctx; |
fb456252 | 1269 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
be50a8dd ZL |
1270 | u64 length = original_sblock->page_count * PAGE_SIZE; |
1271 | u64 logical = original_sblock->pagev[0]->logical; | |
4734b7ed ZL |
1272 | u64 generation = original_sblock->pagev[0]->generation; |
1273 | u64 flags = original_sblock->pagev[0]->flags; | |
1274 | u64 have_csum = original_sblock->pagev[0]->have_csum; | |
af8e2d1d MX |
1275 | struct scrub_recover *recover; |
1276 | struct btrfs_bio *bbio; | |
af8e2d1d MX |
1277 | u64 sublen; |
1278 | u64 mapped_length; | |
1279 | u64 stripe_offset; | |
1280 | int stripe_index; | |
be50a8dd | 1281 | int page_index = 0; |
b5d67f64 | 1282 | int mirror_index; |
af8e2d1d | 1283 | int nmirrors; |
b5d67f64 SB |
1284 | int ret; |
1285 | ||
1286 | /* | |
57019345 | 1287 | * note: the two members refs and outstanding_pages |
b5d67f64 SB |
1288 | * are not used (and not set) in the blocks that are used for |
1289 | * the recheck procedure | |
1290 | */ | |
1291 | ||
b5d67f64 | 1292 | while (length > 0) { |
af8e2d1d MX |
1293 | sublen = min_t(u64, length, PAGE_SIZE); |
1294 | mapped_length = sublen; | |
1295 | bbio = NULL; | |
a2de733c | 1296 | |
b5d67f64 SB |
1297 | /* |
1298 | * with a length of PAGE_SIZE, each returned stripe | |
1299 | * represents one mirror | |
1300 | */ | |
e501bfe3 | 1301 | btrfs_bio_counter_inc_blocked(fs_info); |
cf8cddd3 | 1302 | ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, |
825ad4c9 | 1303 | logical, &mapped_length, &bbio); |
b5d67f64 | 1304 | if (ret || !bbio || mapped_length < sublen) { |
6e9606d2 | 1305 | btrfs_put_bbio(bbio); |
e501bfe3 | 1306 | btrfs_bio_counter_dec(fs_info); |
b5d67f64 SB |
1307 | return -EIO; |
1308 | } | |
a2de733c | 1309 | |
af8e2d1d MX |
1310 | recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS); |
1311 | if (!recover) { | |
6e9606d2 | 1312 | btrfs_put_bbio(bbio); |
e501bfe3 | 1313 | btrfs_bio_counter_dec(fs_info); |
af8e2d1d MX |
1314 | return -ENOMEM; |
1315 | } | |
1316 | ||
6f615018 | 1317 | refcount_set(&recover->refs, 1); |
af8e2d1d | 1318 | recover->bbio = bbio; |
af8e2d1d MX |
1319 | recover->map_length = mapped_length; |
1320 | ||
24731149 | 1321 | BUG_ON(page_index >= SCRUB_MAX_PAGES_PER_BLOCK); |
af8e2d1d | 1322 | |
be50a8dd | 1323 | nmirrors = min(scrub_nr_raid_mirrors(bbio), BTRFS_MAX_MIRRORS); |
10f11900 | 1324 | |
af8e2d1d | 1325 | for (mirror_index = 0; mirror_index < nmirrors; |
b5d67f64 SB |
1326 | mirror_index++) { |
1327 | struct scrub_block *sblock; | |
1328 | struct scrub_page *page; | |
1329 | ||
b5d67f64 | 1330 | sblock = sblocks_for_recheck + mirror_index; |
7a9e9987 | 1331 | sblock->sctx = sctx; |
4734b7ed | 1332 | |
7a9e9987 SB |
1333 | page = kzalloc(sizeof(*page), GFP_NOFS); |
1334 | if (!page) { | |
1335 | leave_nomem: | |
d9d181c1 SB |
1336 | spin_lock(&sctx->stat_lock); |
1337 | sctx->stat.malloc_errors++; | |
1338 | spin_unlock(&sctx->stat_lock); | |
e501bfe3 | 1339 | scrub_put_recover(fs_info, recover); |
b5d67f64 SB |
1340 | return -ENOMEM; |
1341 | } | |
7a9e9987 SB |
1342 | scrub_page_get(page); |
1343 | sblock->pagev[page_index] = page; | |
4734b7ed ZL |
1344 | page->sblock = sblock; |
1345 | page->flags = flags; | |
1346 | page->generation = generation; | |
7a9e9987 | 1347 | page->logical = logical; |
4734b7ed ZL |
1348 | page->have_csum = have_csum; |
1349 | if (have_csum) | |
1350 | memcpy(page->csum, | |
1351 | original_sblock->pagev[0]->csum, | |
1352 | sctx->csum_size); | |
af8e2d1d | 1353 | |
10f11900 ZL |
1354 | scrub_stripe_index_and_offset(logical, |
1355 | bbio->map_type, | |
1356 | bbio->raid_map, | |
af8e2d1d | 1357 | mapped_length, |
e34c330d ZL |
1358 | bbio->num_stripes - |
1359 | bbio->num_tgtdevs, | |
af8e2d1d MX |
1360 | mirror_index, |
1361 | &stripe_index, | |
1362 | &stripe_offset); | |
1363 | page->physical = bbio->stripes[stripe_index].physical + | |
1364 | stripe_offset; | |
1365 | page->dev = bbio->stripes[stripe_index].dev; | |
1366 | ||
ff023aac SB |
1367 | BUG_ON(page_index >= original_sblock->page_count); |
1368 | page->physical_for_dev_replace = | |
1369 | original_sblock->pagev[page_index]-> | |
1370 | physical_for_dev_replace; | |
7a9e9987 | 1371 | /* for missing devices, dev->bdev is NULL */ |
7a9e9987 | 1372 | page->mirror_num = mirror_index + 1; |
b5d67f64 | 1373 | sblock->page_count++; |
7a9e9987 SB |
1374 | page->page = alloc_page(GFP_NOFS); |
1375 | if (!page->page) | |
1376 | goto leave_nomem; | |
af8e2d1d MX |
1377 | |
1378 | scrub_get_recover(recover); | |
1379 | page->recover = recover; | |
b5d67f64 | 1380 | } |
e501bfe3 | 1381 | scrub_put_recover(fs_info, recover); |
b5d67f64 SB |
1382 | length -= sublen; |
1383 | logical += sublen; | |
1384 | page_index++; | |
1385 | } | |
1386 | ||
1387 | return 0; | |
96e36920 ID |
1388 | } |
1389 | ||
4246a0b6 | 1390 | static void scrub_bio_wait_endio(struct bio *bio) |
af8e2d1d | 1391 | { |
b4ff5ad7 | 1392 | complete(bio->bi_private); |
af8e2d1d MX |
1393 | } |
1394 | ||
af8e2d1d MX |
1395 | static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info, |
1396 | struct bio *bio, | |
1397 | struct scrub_page *page) | |
1398 | { | |
b4ff5ad7 | 1399 | DECLARE_COMPLETION_ONSTACK(done); |
af8e2d1d | 1400 | int ret; |
762221f0 | 1401 | int mirror_num; |
af8e2d1d | 1402 | |
af8e2d1d MX |
1403 | bio->bi_iter.bi_sector = page->logical >> 9; |
1404 | bio->bi_private = &done; | |
1405 | bio->bi_end_io = scrub_bio_wait_endio; | |
1406 | ||
762221f0 | 1407 | mirror_num = page->sblock->pagev[0]->mirror_num; |
2ff7e61e | 1408 | ret = raid56_parity_recover(fs_info, bio, page->recover->bbio, |
af8e2d1d | 1409 | page->recover->map_length, |
762221f0 | 1410 | mirror_num, 0); |
af8e2d1d MX |
1411 | if (ret) |
1412 | return ret; | |
1413 | ||
b4ff5ad7 LB |
1414 | wait_for_completion_io(&done); |
1415 | return blk_status_to_errno(bio->bi_status); | |
af8e2d1d MX |
1416 | } |
1417 | ||
6ca1765b LB |
1418 | static void scrub_recheck_block_on_raid56(struct btrfs_fs_info *fs_info, |
1419 | struct scrub_block *sblock) | |
1420 | { | |
1421 | struct scrub_page *first_page = sblock->pagev[0]; | |
1422 | struct bio *bio; | |
1423 | int page_num; | |
1424 | ||
1425 | /* All pages in sblock belong to the same stripe on the same device. */ | |
1426 | ASSERT(first_page->dev); | |
1427 | if (!first_page->dev->bdev) | |
1428 | goto out; | |
1429 | ||
1430 | bio = btrfs_io_bio_alloc(BIO_MAX_PAGES); | |
1431 | bio_set_dev(bio, first_page->dev->bdev); | |
1432 | ||
1433 | for (page_num = 0; page_num < sblock->page_count; page_num++) { | |
1434 | struct scrub_page *page = sblock->pagev[page_num]; | |
1435 | ||
1436 | WARN_ON(!page->page); | |
1437 | bio_add_page(bio, page->page, PAGE_SIZE, 0); | |
1438 | } | |
1439 | ||
1440 | if (scrub_submit_raid56_bio_wait(fs_info, bio, first_page)) { | |
1441 | bio_put(bio); | |
1442 | goto out; | |
1443 | } | |
1444 | ||
1445 | bio_put(bio); | |
1446 | ||
1447 | scrub_recheck_block_checksum(sblock); | |
1448 | ||
1449 | return; | |
1450 | out: | |
1451 | for (page_num = 0; page_num < sblock->page_count; page_num++) | |
1452 | sblock->pagev[page_num]->io_error = 1; | |
1453 | ||
1454 | sblock->no_io_error_seen = 0; | |
1455 | } | |
1456 | ||
b5d67f64 SB |
1457 | /* |
1458 | * this function will check the on disk data for checksum errors, header | |
1459 | * errors and read I/O errors. If any I/O errors happen, the exact pages | |
1460 | * which are errored are marked as being bad. The goal is to enable scrub | |
1461 | * to take those pages that are not errored from all the mirrors so that | |
1462 | * the pages that are errored in the just handled mirror can be repaired. | |
1463 | */ | |
34f5c8e9 | 1464 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
affe4a5a ZL |
1465 | struct scrub_block *sblock, |
1466 | int retry_failed_mirror) | |
96e36920 | 1467 | { |
b5d67f64 | 1468 | int page_num; |
96e36920 | 1469 | |
b5d67f64 | 1470 | sblock->no_io_error_seen = 1; |
96e36920 | 1471 | |
6ca1765b LB |
1472 | /* short cut for raid56 */ |
1473 | if (!retry_failed_mirror && scrub_is_page_on_raid56(sblock->pagev[0])) | |
1474 | return scrub_recheck_block_on_raid56(fs_info, sblock); | |
1475 | ||
b5d67f64 SB |
1476 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1477 | struct bio *bio; | |
7a9e9987 | 1478 | struct scrub_page *page = sblock->pagev[page_num]; |
b5d67f64 | 1479 | |
442a4f63 | 1480 | if (page->dev->bdev == NULL) { |
ea9947b4 SB |
1481 | page->io_error = 1; |
1482 | sblock->no_io_error_seen = 0; | |
1483 | continue; | |
1484 | } | |
1485 | ||
7a9e9987 | 1486 | WARN_ON(!page->page); |
c5e4c3d7 | 1487 | bio = btrfs_io_bio_alloc(1); |
74d46992 | 1488 | bio_set_dev(bio, page->dev->bdev); |
b5d67f64 | 1489 | |
34f5c8e9 | 1490 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
6ca1765b LB |
1491 | bio->bi_iter.bi_sector = page->physical >> 9; |
1492 | bio->bi_opf = REQ_OP_READ; | |
af8e2d1d | 1493 | |
6ca1765b LB |
1494 | if (btrfsic_submit_bio_wait(bio)) { |
1495 | page->io_error = 1; | |
1496 | sblock->no_io_error_seen = 0; | |
af8e2d1d | 1497 | } |
33879d45 | 1498 | |
b5d67f64 SB |
1499 | bio_put(bio); |
1500 | } | |
96e36920 | 1501 | |
b5d67f64 | 1502 | if (sblock->no_io_error_seen) |
ba7cf988 | 1503 | scrub_recheck_block_checksum(sblock); |
a2de733c AJ |
1504 | } |
1505 | ||
17a9be2f MX |
1506 | static inline int scrub_check_fsid(u8 fsid[], |
1507 | struct scrub_page *spage) | |
1508 | { | |
1509 | struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices; | |
1510 | int ret; | |
1511 | ||
44880fdc | 1512 | ret = memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE); |
17a9be2f MX |
1513 | return !ret; |
1514 | } | |
1515 | ||
ba7cf988 | 1516 | static void scrub_recheck_block_checksum(struct scrub_block *sblock) |
a2de733c | 1517 | { |
ba7cf988 ZL |
1518 | sblock->header_error = 0; |
1519 | sblock->checksum_error = 0; | |
1520 | sblock->generation_error = 0; | |
b5d67f64 | 1521 | |
ba7cf988 ZL |
1522 | if (sblock->pagev[0]->flags & BTRFS_EXTENT_FLAG_DATA) |
1523 | scrub_checksum_data(sblock); | |
1524 | else | |
1525 | scrub_checksum_tree_block(sblock); | |
a2de733c AJ |
1526 | } |
1527 | ||
b5d67f64 | 1528 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
114ab50d | 1529 | struct scrub_block *sblock_good) |
b5d67f64 SB |
1530 | { |
1531 | int page_num; | |
1532 | int ret = 0; | |
96e36920 | 1533 | |
b5d67f64 SB |
1534 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
1535 | int ret_sub; | |
96e36920 | 1536 | |
b5d67f64 SB |
1537 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
1538 | sblock_good, | |
114ab50d | 1539 | page_num, 1); |
b5d67f64 SB |
1540 | if (ret_sub) |
1541 | ret = ret_sub; | |
a2de733c | 1542 | } |
b5d67f64 SB |
1543 | |
1544 | return ret; | |
1545 | } | |
1546 | ||
1547 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
1548 | struct scrub_block *sblock_good, | |
1549 | int page_num, int force_write) | |
1550 | { | |
7a9e9987 SB |
1551 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
1552 | struct scrub_page *page_good = sblock_good->pagev[page_num]; | |
0b246afa | 1553 | struct btrfs_fs_info *fs_info = sblock_bad->sctx->fs_info; |
b5d67f64 | 1554 | |
7a9e9987 SB |
1555 | BUG_ON(page_bad->page == NULL); |
1556 | BUG_ON(page_good->page == NULL); | |
b5d67f64 SB |
1557 | if (force_write || sblock_bad->header_error || |
1558 | sblock_bad->checksum_error || page_bad->io_error) { | |
1559 | struct bio *bio; | |
1560 | int ret; | |
b5d67f64 | 1561 | |
ff023aac | 1562 | if (!page_bad->dev->bdev) { |
0b246afa | 1563 | btrfs_warn_rl(fs_info, |
5d163e0e | 1564 | "scrub_repair_page_from_good_copy(bdev == NULL) is unexpected"); |
ff023aac SB |
1565 | return -EIO; |
1566 | } | |
1567 | ||
c5e4c3d7 | 1568 | bio = btrfs_io_bio_alloc(1); |
74d46992 | 1569 | bio_set_dev(bio, page_bad->dev->bdev); |
4f024f37 | 1570 | bio->bi_iter.bi_sector = page_bad->physical >> 9; |
ebcc3263 | 1571 | bio->bi_opf = REQ_OP_WRITE; |
b5d67f64 SB |
1572 | |
1573 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); | |
1574 | if (PAGE_SIZE != ret) { | |
1575 | bio_put(bio); | |
1576 | return -EIO; | |
13db62b7 | 1577 | } |
b5d67f64 | 1578 | |
4e49ea4a | 1579 | if (btrfsic_submit_bio_wait(bio)) { |
442a4f63 SB |
1580 | btrfs_dev_stat_inc_and_print(page_bad->dev, |
1581 | BTRFS_DEV_STAT_WRITE_ERRS); | |
e37abe97 | 1582 | atomic64_inc(&fs_info->dev_replace.num_write_errors); |
442a4f63 SB |
1583 | bio_put(bio); |
1584 | return -EIO; | |
1585 | } | |
b5d67f64 | 1586 | bio_put(bio); |
a2de733c AJ |
1587 | } |
1588 | ||
b5d67f64 SB |
1589 | return 0; |
1590 | } | |
1591 | ||
ff023aac SB |
1592 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
1593 | { | |
0b246afa | 1594 | struct btrfs_fs_info *fs_info = sblock->sctx->fs_info; |
ff023aac SB |
1595 | int page_num; |
1596 | ||
5a6ac9ea MX |
1597 | /* |
1598 | * This block is used for the check of the parity on the source device, | |
1599 | * so the data needn't be written into the destination device. | |
1600 | */ | |
1601 | if (sblock->sparity) | |
1602 | return; | |
1603 | ||
ff023aac SB |
1604 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1605 | int ret; | |
1606 | ||
1607 | ret = scrub_write_page_to_dev_replace(sblock, page_num); | |
1608 | if (ret) | |
e37abe97 | 1609 | atomic64_inc(&fs_info->dev_replace.num_write_errors); |
ff023aac SB |
1610 | } |
1611 | } | |
1612 | ||
1613 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
1614 | int page_num) | |
1615 | { | |
1616 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1617 | ||
1618 | BUG_ON(spage->page == NULL); | |
1619 | if (spage->io_error) { | |
1620 | void *mapped_buffer = kmap_atomic(spage->page); | |
1621 | ||
619a9742 | 1622 | clear_page(mapped_buffer); |
ff023aac SB |
1623 | flush_dcache_page(spage->page); |
1624 | kunmap_atomic(mapped_buffer); | |
1625 | } | |
1626 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); | |
1627 | } | |
1628 | ||
1629 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
1630 | struct scrub_page *spage) | |
1631 | { | |
ff023aac SB |
1632 | struct scrub_bio *sbio; |
1633 | int ret; | |
1634 | ||
3fb99303 | 1635 | mutex_lock(&sctx->wr_lock); |
ff023aac | 1636 | again: |
3fb99303 DS |
1637 | if (!sctx->wr_curr_bio) { |
1638 | sctx->wr_curr_bio = kzalloc(sizeof(*sctx->wr_curr_bio), | |
58c4e173 | 1639 | GFP_KERNEL); |
3fb99303 DS |
1640 | if (!sctx->wr_curr_bio) { |
1641 | mutex_unlock(&sctx->wr_lock); | |
ff023aac SB |
1642 | return -ENOMEM; |
1643 | } | |
3fb99303 DS |
1644 | sctx->wr_curr_bio->sctx = sctx; |
1645 | sctx->wr_curr_bio->page_count = 0; | |
ff023aac | 1646 | } |
3fb99303 | 1647 | sbio = sctx->wr_curr_bio; |
ff023aac SB |
1648 | if (sbio->page_count == 0) { |
1649 | struct bio *bio; | |
1650 | ||
1651 | sbio->physical = spage->physical_for_dev_replace; | |
1652 | sbio->logical = spage->logical; | |
3fb99303 | 1653 | sbio->dev = sctx->wr_tgtdev; |
ff023aac SB |
1654 | bio = sbio->bio; |
1655 | if (!bio) { | |
c5e4c3d7 | 1656 | bio = btrfs_io_bio_alloc(sctx->pages_per_wr_bio); |
ff023aac SB |
1657 | sbio->bio = bio; |
1658 | } | |
1659 | ||
1660 | bio->bi_private = sbio; | |
1661 | bio->bi_end_io = scrub_wr_bio_end_io; | |
74d46992 | 1662 | bio_set_dev(bio, sbio->dev->bdev); |
4f024f37 | 1663 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
ebcc3263 | 1664 | bio->bi_opf = REQ_OP_WRITE; |
4e4cbee9 | 1665 | sbio->status = 0; |
ff023aac SB |
1666 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
1667 | spage->physical_for_dev_replace || | |
1668 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
1669 | spage->logical) { | |
1670 | scrub_wr_submit(sctx); | |
1671 | goto again; | |
1672 | } | |
1673 | ||
1674 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1675 | if (ret != PAGE_SIZE) { | |
1676 | if (sbio->page_count < 1) { | |
1677 | bio_put(sbio->bio); | |
1678 | sbio->bio = NULL; | |
3fb99303 | 1679 | mutex_unlock(&sctx->wr_lock); |
ff023aac SB |
1680 | return -EIO; |
1681 | } | |
1682 | scrub_wr_submit(sctx); | |
1683 | goto again; | |
1684 | } | |
1685 | ||
1686 | sbio->pagev[sbio->page_count] = spage; | |
1687 | scrub_page_get(spage); | |
1688 | sbio->page_count++; | |
3fb99303 | 1689 | if (sbio->page_count == sctx->pages_per_wr_bio) |
ff023aac | 1690 | scrub_wr_submit(sctx); |
3fb99303 | 1691 | mutex_unlock(&sctx->wr_lock); |
ff023aac SB |
1692 | |
1693 | return 0; | |
1694 | } | |
1695 | ||
1696 | static void scrub_wr_submit(struct scrub_ctx *sctx) | |
1697 | { | |
ff023aac SB |
1698 | struct scrub_bio *sbio; |
1699 | ||
3fb99303 | 1700 | if (!sctx->wr_curr_bio) |
ff023aac SB |
1701 | return; |
1702 | ||
3fb99303 DS |
1703 | sbio = sctx->wr_curr_bio; |
1704 | sctx->wr_curr_bio = NULL; | |
74d46992 | 1705 | WARN_ON(!sbio->bio->bi_disk); |
ff023aac SB |
1706 | scrub_pending_bio_inc(sctx); |
1707 | /* process all writes in a single worker thread. Then the block layer | |
1708 | * orders the requests before sending them to the driver which | |
1709 | * doubled the write performance on spinning disks when measured | |
1710 | * with Linux 3.5 */ | |
4e49ea4a | 1711 | btrfsic_submit_bio(sbio->bio); |
ff023aac SB |
1712 | } |
1713 | ||
4246a0b6 | 1714 | static void scrub_wr_bio_end_io(struct bio *bio) |
ff023aac SB |
1715 | { |
1716 | struct scrub_bio *sbio = bio->bi_private; | |
fb456252 | 1717 | struct btrfs_fs_info *fs_info = sbio->dev->fs_info; |
ff023aac | 1718 | |
4e4cbee9 | 1719 | sbio->status = bio->bi_status; |
ff023aac SB |
1720 | sbio->bio = bio; |
1721 | ||
9e0af237 LB |
1722 | btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper, |
1723 | scrub_wr_bio_end_io_worker, NULL, NULL); | |
0339ef2f | 1724 | btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work); |
ff023aac SB |
1725 | } |
1726 | ||
1727 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) | |
1728 | { | |
1729 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
1730 | struct scrub_ctx *sctx = sbio->sctx; | |
1731 | int i; | |
1732 | ||
1733 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); | |
4e4cbee9 | 1734 | if (sbio->status) { |
ff023aac | 1735 | struct btrfs_dev_replace *dev_replace = |
fb456252 | 1736 | &sbio->sctx->fs_info->dev_replace; |
ff023aac SB |
1737 | |
1738 | for (i = 0; i < sbio->page_count; i++) { | |
1739 | struct scrub_page *spage = sbio->pagev[i]; | |
1740 | ||
1741 | spage->io_error = 1; | |
e37abe97 | 1742 | atomic64_inc(&dev_replace->num_write_errors); |
ff023aac SB |
1743 | } |
1744 | } | |
1745 | ||
1746 | for (i = 0; i < sbio->page_count; i++) | |
1747 | scrub_page_put(sbio->pagev[i]); | |
1748 | ||
1749 | bio_put(sbio->bio); | |
1750 | kfree(sbio); | |
1751 | scrub_pending_bio_dec(sctx); | |
1752 | } | |
1753 | ||
1754 | static int scrub_checksum(struct scrub_block *sblock) | |
b5d67f64 SB |
1755 | { |
1756 | u64 flags; | |
1757 | int ret; | |
1758 | ||
ba7cf988 ZL |
1759 | /* |
1760 | * No need to initialize these stats currently, | |
1761 | * because this function only use return value | |
1762 | * instead of these stats value. | |
1763 | * | |
1764 | * Todo: | |
1765 | * always use stats | |
1766 | */ | |
1767 | sblock->header_error = 0; | |
1768 | sblock->generation_error = 0; | |
1769 | sblock->checksum_error = 0; | |
1770 | ||
7a9e9987 SB |
1771 | WARN_ON(sblock->page_count < 1); |
1772 | flags = sblock->pagev[0]->flags; | |
b5d67f64 SB |
1773 | ret = 0; |
1774 | if (flags & BTRFS_EXTENT_FLAG_DATA) | |
1775 | ret = scrub_checksum_data(sblock); | |
1776 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) | |
1777 | ret = scrub_checksum_tree_block(sblock); | |
1778 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
1779 | (void)scrub_checksum_super(sblock); | |
1780 | else | |
1781 | WARN_ON(1); | |
1782 | if (ret) | |
1783 | scrub_handle_errored_block(sblock); | |
ff023aac SB |
1784 | |
1785 | return ret; | |
a2de733c AJ |
1786 | } |
1787 | ||
b5d67f64 | 1788 | static int scrub_checksum_data(struct scrub_block *sblock) |
a2de733c | 1789 | { |
d9d181c1 | 1790 | struct scrub_ctx *sctx = sblock->sctx; |
d5178578 JT |
1791 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
1792 | SHASH_DESC_ON_STACK(shash, fs_info->csum_shash); | |
a2de733c | 1793 | u8 csum[BTRFS_CSUM_SIZE]; |
b5d67f64 SB |
1794 | u8 *on_disk_csum; |
1795 | struct page *page; | |
1796 | void *buffer; | |
b5d67f64 SB |
1797 | u64 len; |
1798 | int index; | |
a2de733c | 1799 | |
b5d67f64 | 1800 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1801 | if (!sblock->pagev[0]->have_csum) |
a2de733c AJ |
1802 | return 0; |
1803 | ||
d5178578 JT |
1804 | shash->tfm = fs_info->csum_shash; |
1805 | crypto_shash_init(shash); | |
1806 | ||
7a9e9987 SB |
1807 | on_disk_csum = sblock->pagev[0]->csum; |
1808 | page = sblock->pagev[0]->page; | |
9613bebb | 1809 | buffer = kmap_atomic(page); |
b5d67f64 | 1810 | |
25cc1226 | 1811 | len = sctx->fs_info->sectorsize; |
b5d67f64 SB |
1812 | index = 0; |
1813 | for (;;) { | |
1814 | u64 l = min_t(u64, len, PAGE_SIZE); | |
1815 | ||
d5178578 | 1816 | crypto_shash_update(shash, buffer, l); |
9613bebb | 1817 | kunmap_atomic(buffer); |
b5d67f64 SB |
1818 | len -= l; |
1819 | if (len == 0) | |
1820 | break; | |
1821 | index++; | |
1822 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1823 | BUG_ON(!sblock->pagev[index]->page); |
1824 | page = sblock->pagev[index]->page; | |
9613bebb | 1825 | buffer = kmap_atomic(page); |
b5d67f64 SB |
1826 | } |
1827 | ||
d5178578 | 1828 | crypto_shash_final(shash, csum); |
d9d181c1 | 1829 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
ba7cf988 | 1830 | sblock->checksum_error = 1; |
a2de733c | 1831 | |
ba7cf988 | 1832 | return sblock->checksum_error; |
a2de733c AJ |
1833 | } |
1834 | ||
b5d67f64 | 1835 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
a2de733c | 1836 | { |
d9d181c1 | 1837 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1838 | struct btrfs_header *h; |
0b246afa | 1839 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
d5178578 | 1840 | SHASH_DESC_ON_STACK(shash, fs_info->csum_shash); |
b5d67f64 SB |
1841 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1842 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1843 | struct page *page; | |
1844 | void *mapped_buffer; | |
1845 | u64 mapped_size; | |
1846 | void *p; | |
b5d67f64 SB |
1847 | u64 len; |
1848 | int index; | |
1849 | ||
d5178578 JT |
1850 | shash->tfm = fs_info->csum_shash; |
1851 | crypto_shash_init(shash); | |
1852 | ||
b5d67f64 | 1853 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1854 | page = sblock->pagev[0]->page; |
9613bebb | 1855 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1856 | h = (struct btrfs_header *)mapped_buffer; |
d9d181c1 | 1857 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
a2de733c AJ |
1858 | |
1859 | /* | |
1860 | * we don't use the getter functions here, as we | |
1861 | * a) don't have an extent buffer and | |
1862 | * b) the page is already kmapped | |
1863 | */ | |
3cae210f | 1864 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h)) |
ba7cf988 | 1865 | sblock->header_error = 1; |
a2de733c | 1866 | |
ba7cf988 ZL |
1867 | if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h)) { |
1868 | sblock->header_error = 1; | |
1869 | sblock->generation_error = 1; | |
1870 | } | |
a2de733c | 1871 | |
17a9be2f | 1872 | if (!scrub_check_fsid(h->fsid, sblock->pagev[0])) |
ba7cf988 | 1873 | sblock->header_error = 1; |
a2de733c AJ |
1874 | |
1875 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
1876 | BTRFS_UUID_SIZE)) | |
ba7cf988 | 1877 | sblock->header_error = 1; |
a2de733c | 1878 | |
25cc1226 | 1879 | len = sctx->fs_info->nodesize - BTRFS_CSUM_SIZE; |
b5d67f64 SB |
1880 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
1881 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1882 | index = 0; | |
1883 | for (;;) { | |
1884 | u64 l = min_t(u64, len, mapped_size); | |
1885 | ||
d5178578 | 1886 | crypto_shash_update(shash, p, l); |
9613bebb | 1887 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1888 | len -= l; |
1889 | if (len == 0) | |
1890 | break; | |
1891 | index++; | |
1892 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1893 | BUG_ON(!sblock->pagev[index]->page); |
1894 | page = sblock->pagev[index]->page; | |
9613bebb | 1895 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1896 | mapped_size = PAGE_SIZE; |
1897 | p = mapped_buffer; | |
1898 | } | |
1899 | ||
d5178578 | 1900 | crypto_shash_final(shash, calculated_csum); |
d9d181c1 | 1901 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
ba7cf988 | 1902 | sblock->checksum_error = 1; |
a2de733c | 1903 | |
ba7cf988 | 1904 | return sblock->header_error || sblock->checksum_error; |
a2de733c AJ |
1905 | } |
1906 | ||
b5d67f64 | 1907 | static int scrub_checksum_super(struct scrub_block *sblock) |
a2de733c AJ |
1908 | { |
1909 | struct btrfs_super_block *s; | |
d9d181c1 | 1910 | struct scrub_ctx *sctx = sblock->sctx; |
d5178578 JT |
1911 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
1912 | SHASH_DESC_ON_STACK(shash, fs_info->csum_shash); | |
b5d67f64 SB |
1913 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1914 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1915 | struct page *page; | |
1916 | void *mapped_buffer; | |
1917 | u64 mapped_size; | |
1918 | void *p; | |
442a4f63 SB |
1919 | int fail_gen = 0; |
1920 | int fail_cor = 0; | |
b5d67f64 SB |
1921 | u64 len; |
1922 | int index; | |
a2de733c | 1923 | |
d5178578 JT |
1924 | shash->tfm = fs_info->csum_shash; |
1925 | crypto_shash_init(shash); | |
1926 | ||
b5d67f64 | 1927 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1928 | page = sblock->pagev[0]->page; |
9613bebb | 1929 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1930 | s = (struct btrfs_super_block *)mapped_buffer; |
d9d181c1 | 1931 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
a2de733c | 1932 | |
3cae210f | 1933 | if (sblock->pagev[0]->logical != btrfs_super_bytenr(s)) |
442a4f63 | 1934 | ++fail_cor; |
a2de733c | 1935 | |
3cae210f | 1936 | if (sblock->pagev[0]->generation != btrfs_super_generation(s)) |
442a4f63 | 1937 | ++fail_gen; |
a2de733c | 1938 | |
17a9be2f | 1939 | if (!scrub_check_fsid(s->fsid, sblock->pagev[0])) |
442a4f63 | 1940 | ++fail_cor; |
a2de733c | 1941 | |
b5d67f64 SB |
1942 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
1943 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; | |
1944 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1945 | index = 0; | |
1946 | for (;;) { | |
1947 | u64 l = min_t(u64, len, mapped_size); | |
1948 | ||
d5178578 | 1949 | crypto_shash_update(shash, p, l); |
9613bebb | 1950 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1951 | len -= l; |
1952 | if (len == 0) | |
1953 | break; | |
1954 | index++; | |
1955 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1956 | BUG_ON(!sblock->pagev[index]->page); |
1957 | page = sblock->pagev[index]->page; | |
9613bebb | 1958 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1959 | mapped_size = PAGE_SIZE; |
1960 | p = mapped_buffer; | |
1961 | } | |
1962 | ||
d5178578 | 1963 | crypto_shash_final(shash, calculated_csum); |
d9d181c1 | 1964 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
442a4f63 | 1965 | ++fail_cor; |
a2de733c | 1966 | |
442a4f63 | 1967 | if (fail_cor + fail_gen) { |
a2de733c AJ |
1968 | /* |
1969 | * if we find an error in a super block, we just report it. | |
1970 | * They will get written with the next transaction commit | |
1971 | * anyway | |
1972 | */ | |
d9d181c1 SB |
1973 | spin_lock(&sctx->stat_lock); |
1974 | ++sctx->stat.super_errors; | |
1975 | spin_unlock(&sctx->stat_lock); | |
442a4f63 | 1976 | if (fail_cor) |
7a9e9987 | 1977 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 SB |
1978 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
1979 | else | |
7a9e9987 | 1980 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 | 1981 | BTRFS_DEV_STAT_GENERATION_ERRS); |
a2de733c AJ |
1982 | } |
1983 | ||
442a4f63 | 1984 | return fail_cor + fail_gen; |
a2de733c AJ |
1985 | } |
1986 | ||
b5d67f64 SB |
1987 | static void scrub_block_get(struct scrub_block *sblock) |
1988 | { | |
186debd6 | 1989 | refcount_inc(&sblock->refs); |
b5d67f64 SB |
1990 | } |
1991 | ||
1992 | static void scrub_block_put(struct scrub_block *sblock) | |
1993 | { | |
186debd6 | 1994 | if (refcount_dec_and_test(&sblock->refs)) { |
b5d67f64 SB |
1995 | int i; |
1996 | ||
5a6ac9ea MX |
1997 | if (sblock->sparity) |
1998 | scrub_parity_put(sblock->sparity); | |
1999 | ||
b5d67f64 | 2000 | for (i = 0; i < sblock->page_count; i++) |
7a9e9987 | 2001 | scrub_page_put(sblock->pagev[i]); |
b5d67f64 SB |
2002 | kfree(sblock); |
2003 | } | |
2004 | } | |
2005 | ||
7a9e9987 SB |
2006 | static void scrub_page_get(struct scrub_page *spage) |
2007 | { | |
57019345 | 2008 | atomic_inc(&spage->refs); |
7a9e9987 SB |
2009 | } |
2010 | ||
2011 | static void scrub_page_put(struct scrub_page *spage) | |
2012 | { | |
57019345 | 2013 | if (atomic_dec_and_test(&spage->refs)) { |
7a9e9987 SB |
2014 | if (spage->page) |
2015 | __free_page(spage->page); | |
2016 | kfree(spage); | |
2017 | } | |
2018 | } | |
2019 | ||
d9d181c1 | 2020 | static void scrub_submit(struct scrub_ctx *sctx) |
a2de733c AJ |
2021 | { |
2022 | struct scrub_bio *sbio; | |
2023 | ||
d9d181c1 | 2024 | if (sctx->curr == -1) |
1623edeb | 2025 | return; |
a2de733c | 2026 | |
d9d181c1 SB |
2027 | sbio = sctx->bios[sctx->curr]; |
2028 | sctx->curr = -1; | |
b6bfebc1 | 2029 | scrub_pending_bio_inc(sctx); |
4e49ea4a | 2030 | btrfsic_submit_bio(sbio->bio); |
a2de733c AJ |
2031 | } |
2032 | ||
ff023aac SB |
2033 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
2034 | struct scrub_page *spage) | |
a2de733c | 2035 | { |
b5d67f64 | 2036 | struct scrub_block *sblock = spage->sblock; |
a2de733c | 2037 | struct scrub_bio *sbio; |
69f4cb52 | 2038 | int ret; |
a2de733c AJ |
2039 | |
2040 | again: | |
2041 | /* | |
2042 | * grab a fresh bio or wait for one to become available | |
2043 | */ | |
d9d181c1 SB |
2044 | while (sctx->curr == -1) { |
2045 | spin_lock(&sctx->list_lock); | |
2046 | sctx->curr = sctx->first_free; | |
2047 | if (sctx->curr != -1) { | |
2048 | sctx->first_free = sctx->bios[sctx->curr]->next_free; | |
2049 | sctx->bios[sctx->curr]->next_free = -1; | |
2050 | sctx->bios[sctx->curr]->page_count = 0; | |
2051 | spin_unlock(&sctx->list_lock); | |
a2de733c | 2052 | } else { |
d9d181c1 SB |
2053 | spin_unlock(&sctx->list_lock); |
2054 | wait_event(sctx->list_wait, sctx->first_free != -1); | |
a2de733c AJ |
2055 | } |
2056 | } | |
d9d181c1 | 2057 | sbio = sctx->bios[sctx->curr]; |
b5d67f64 | 2058 | if (sbio->page_count == 0) { |
69f4cb52 AJ |
2059 | struct bio *bio; |
2060 | ||
b5d67f64 SB |
2061 | sbio->physical = spage->physical; |
2062 | sbio->logical = spage->logical; | |
a36cf8b8 | 2063 | sbio->dev = spage->dev; |
b5d67f64 SB |
2064 | bio = sbio->bio; |
2065 | if (!bio) { | |
c5e4c3d7 | 2066 | bio = btrfs_io_bio_alloc(sctx->pages_per_rd_bio); |
b5d67f64 SB |
2067 | sbio->bio = bio; |
2068 | } | |
69f4cb52 AJ |
2069 | |
2070 | bio->bi_private = sbio; | |
2071 | bio->bi_end_io = scrub_bio_end_io; | |
74d46992 | 2072 | bio_set_dev(bio, sbio->dev->bdev); |
4f024f37 | 2073 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
ebcc3263 | 2074 | bio->bi_opf = REQ_OP_READ; |
4e4cbee9 | 2075 | sbio->status = 0; |
b5d67f64 SB |
2076 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
2077 | spage->physical || | |
2078 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
a36cf8b8 SB |
2079 | spage->logical || |
2080 | sbio->dev != spage->dev) { | |
d9d181c1 | 2081 | scrub_submit(sctx); |
a2de733c AJ |
2082 | goto again; |
2083 | } | |
69f4cb52 | 2084 | |
b5d67f64 SB |
2085 | sbio->pagev[sbio->page_count] = spage; |
2086 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
2087 | if (ret != PAGE_SIZE) { | |
2088 | if (sbio->page_count < 1) { | |
2089 | bio_put(sbio->bio); | |
2090 | sbio->bio = NULL; | |
2091 | return -EIO; | |
2092 | } | |
d9d181c1 | 2093 | scrub_submit(sctx); |
69f4cb52 AJ |
2094 | goto again; |
2095 | } | |
2096 | ||
ff023aac | 2097 | scrub_block_get(sblock); /* one for the page added to the bio */ |
b5d67f64 SB |
2098 | atomic_inc(&sblock->outstanding_pages); |
2099 | sbio->page_count++; | |
ff023aac | 2100 | if (sbio->page_count == sctx->pages_per_rd_bio) |
d9d181c1 | 2101 | scrub_submit(sctx); |
b5d67f64 SB |
2102 | |
2103 | return 0; | |
2104 | } | |
2105 | ||
22365979 | 2106 | static void scrub_missing_raid56_end_io(struct bio *bio) |
73ff61db OS |
2107 | { |
2108 | struct scrub_block *sblock = bio->bi_private; | |
fb456252 | 2109 | struct btrfs_fs_info *fs_info = sblock->sctx->fs_info; |
73ff61db | 2110 | |
4e4cbee9 | 2111 | if (bio->bi_status) |
73ff61db OS |
2112 | sblock->no_io_error_seen = 0; |
2113 | ||
4673272f ST |
2114 | bio_put(bio); |
2115 | ||
73ff61db OS |
2116 | btrfs_queue_work(fs_info->scrub_workers, &sblock->work); |
2117 | } | |
2118 | ||
2119 | static void scrub_missing_raid56_worker(struct btrfs_work *work) | |
2120 | { | |
2121 | struct scrub_block *sblock = container_of(work, struct scrub_block, work); | |
2122 | struct scrub_ctx *sctx = sblock->sctx; | |
0b246afa | 2123 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
73ff61db OS |
2124 | u64 logical; |
2125 | struct btrfs_device *dev; | |
2126 | ||
73ff61db OS |
2127 | logical = sblock->pagev[0]->logical; |
2128 | dev = sblock->pagev[0]->dev; | |
2129 | ||
affe4a5a | 2130 | if (sblock->no_io_error_seen) |
ba7cf988 | 2131 | scrub_recheck_block_checksum(sblock); |
73ff61db OS |
2132 | |
2133 | if (!sblock->no_io_error_seen) { | |
2134 | spin_lock(&sctx->stat_lock); | |
2135 | sctx->stat.read_errors++; | |
2136 | spin_unlock(&sctx->stat_lock); | |
0b246afa | 2137 | btrfs_err_rl_in_rcu(fs_info, |
b14af3b4 | 2138 | "IO error rebuilding logical %llu for dev %s", |
73ff61db OS |
2139 | logical, rcu_str_deref(dev->name)); |
2140 | } else if (sblock->header_error || sblock->checksum_error) { | |
2141 | spin_lock(&sctx->stat_lock); | |
2142 | sctx->stat.uncorrectable_errors++; | |
2143 | spin_unlock(&sctx->stat_lock); | |
0b246afa | 2144 | btrfs_err_rl_in_rcu(fs_info, |
b14af3b4 | 2145 | "failed to rebuild valid logical %llu for dev %s", |
73ff61db OS |
2146 | logical, rcu_str_deref(dev->name)); |
2147 | } else { | |
2148 | scrub_write_block_to_dev_replace(sblock); | |
2149 | } | |
2150 | ||
2151 | scrub_block_put(sblock); | |
2152 | ||
2073c4c2 | 2153 | if (sctx->is_dev_replace && sctx->flush_all_writes) { |
3fb99303 | 2154 | mutex_lock(&sctx->wr_lock); |
73ff61db | 2155 | scrub_wr_submit(sctx); |
3fb99303 | 2156 | mutex_unlock(&sctx->wr_lock); |
73ff61db OS |
2157 | } |
2158 | ||
2159 | scrub_pending_bio_dec(sctx); | |
2160 | } | |
2161 | ||
2162 | static void scrub_missing_raid56_pages(struct scrub_block *sblock) | |
2163 | { | |
2164 | struct scrub_ctx *sctx = sblock->sctx; | |
fb456252 | 2165 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
73ff61db OS |
2166 | u64 length = sblock->page_count * PAGE_SIZE; |
2167 | u64 logical = sblock->pagev[0]->logical; | |
f1fee653 | 2168 | struct btrfs_bio *bbio = NULL; |
73ff61db OS |
2169 | struct bio *bio; |
2170 | struct btrfs_raid_bio *rbio; | |
2171 | int ret; | |
2172 | int i; | |
2173 | ||
ae6529c3 | 2174 | btrfs_bio_counter_inc_blocked(fs_info); |
cf8cddd3 | 2175 | ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical, |
825ad4c9 | 2176 | &length, &bbio); |
73ff61db OS |
2177 | if (ret || !bbio || !bbio->raid_map) |
2178 | goto bbio_out; | |
2179 | ||
2180 | if (WARN_ON(!sctx->is_dev_replace || | |
2181 | !(bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK))) { | |
2182 | /* | |
2183 | * We shouldn't be scrubbing a missing device. Even for dev | |
2184 | * replace, we should only get here for RAID 5/6. We either | |
2185 | * managed to mount something with no mirrors remaining or | |
2186 | * there's a bug in scrub_remap_extent()/btrfs_map_block(). | |
2187 | */ | |
2188 | goto bbio_out; | |
2189 | } | |
2190 | ||
c5e4c3d7 | 2191 | bio = btrfs_io_bio_alloc(0); |
73ff61db OS |
2192 | bio->bi_iter.bi_sector = logical >> 9; |
2193 | bio->bi_private = sblock; | |
2194 | bio->bi_end_io = scrub_missing_raid56_end_io; | |
2195 | ||
2ff7e61e | 2196 | rbio = raid56_alloc_missing_rbio(fs_info, bio, bbio, length); |
73ff61db OS |
2197 | if (!rbio) |
2198 | goto rbio_out; | |
2199 | ||
2200 | for (i = 0; i < sblock->page_count; i++) { | |
2201 | struct scrub_page *spage = sblock->pagev[i]; | |
2202 | ||
2203 | raid56_add_scrub_pages(rbio, spage->page, spage->logical); | |
2204 | } | |
2205 | ||
2206 | btrfs_init_work(&sblock->work, btrfs_scrub_helper, | |
2207 | scrub_missing_raid56_worker, NULL, NULL); | |
2208 | scrub_block_get(sblock); | |
2209 | scrub_pending_bio_inc(sctx); | |
2210 | raid56_submit_missing_rbio(rbio); | |
2211 | return; | |
2212 | ||
2213 | rbio_out: | |
2214 | bio_put(bio); | |
2215 | bbio_out: | |
ae6529c3 | 2216 | btrfs_bio_counter_dec(fs_info); |
73ff61db OS |
2217 | btrfs_put_bbio(bbio); |
2218 | spin_lock(&sctx->stat_lock); | |
2219 | sctx->stat.malloc_errors++; | |
2220 | spin_unlock(&sctx->stat_lock); | |
2221 | } | |
2222 | ||
d9d181c1 | 2223 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2224 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
2225 | u64 gen, int mirror_num, u8 *csum, int force, |
2226 | u64 physical_for_dev_replace) | |
b5d67f64 SB |
2227 | { |
2228 | struct scrub_block *sblock; | |
2229 | int index; | |
2230 | ||
58c4e173 | 2231 | sblock = kzalloc(sizeof(*sblock), GFP_KERNEL); |
b5d67f64 | 2232 | if (!sblock) { |
d9d181c1 SB |
2233 | spin_lock(&sctx->stat_lock); |
2234 | sctx->stat.malloc_errors++; | |
2235 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2236 | return -ENOMEM; |
a2de733c | 2237 | } |
b5d67f64 | 2238 | |
7a9e9987 SB |
2239 | /* one ref inside this function, plus one for each page added to |
2240 | * a bio later on */ | |
186debd6 | 2241 | refcount_set(&sblock->refs, 1); |
d9d181c1 | 2242 | sblock->sctx = sctx; |
b5d67f64 SB |
2243 | sblock->no_io_error_seen = 1; |
2244 | ||
2245 | for (index = 0; len > 0; index++) { | |
7a9e9987 | 2246 | struct scrub_page *spage; |
b5d67f64 SB |
2247 | u64 l = min_t(u64, len, PAGE_SIZE); |
2248 | ||
58c4e173 | 2249 | spage = kzalloc(sizeof(*spage), GFP_KERNEL); |
7a9e9987 SB |
2250 | if (!spage) { |
2251 | leave_nomem: | |
d9d181c1 SB |
2252 | spin_lock(&sctx->stat_lock); |
2253 | sctx->stat.malloc_errors++; | |
2254 | spin_unlock(&sctx->stat_lock); | |
7a9e9987 | 2255 | scrub_block_put(sblock); |
b5d67f64 SB |
2256 | return -ENOMEM; |
2257 | } | |
7a9e9987 SB |
2258 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
2259 | scrub_page_get(spage); | |
2260 | sblock->pagev[index] = spage; | |
b5d67f64 | 2261 | spage->sblock = sblock; |
a36cf8b8 | 2262 | spage->dev = dev; |
b5d67f64 SB |
2263 | spage->flags = flags; |
2264 | spage->generation = gen; | |
2265 | spage->logical = logical; | |
2266 | spage->physical = physical; | |
ff023aac | 2267 | spage->physical_for_dev_replace = physical_for_dev_replace; |
b5d67f64 SB |
2268 | spage->mirror_num = mirror_num; |
2269 | if (csum) { | |
2270 | spage->have_csum = 1; | |
d9d181c1 | 2271 | memcpy(spage->csum, csum, sctx->csum_size); |
b5d67f64 SB |
2272 | } else { |
2273 | spage->have_csum = 0; | |
2274 | } | |
2275 | sblock->page_count++; | |
58c4e173 | 2276 | spage->page = alloc_page(GFP_KERNEL); |
7a9e9987 SB |
2277 | if (!spage->page) |
2278 | goto leave_nomem; | |
b5d67f64 SB |
2279 | len -= l; |
2280 | logical += l; | |
2281 | physical += l; | |
ff023aac | 2282 | physical_for_dev_replace += l; |
b5d67f64 SB |
2283 | } |
2284 | ||
7a9e9987 | 2285 | WARN_ON(sblock->page_count == 0); |
e6e674bd | 2286 | if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) { |
73ff61db OS |
2287 | /* |
2288 | * This case should only be hit for RAID 5/6 device replace. See | |
2289 | * the comment in scrub_missing_raid56_pages() for details. | |
2290 | */ | |
2291 | scrub_missing_raid56_pages(sblock); | |
2292 | } else { | |
2293 | for (index = 0; index < sblock->page_count; index++) { | |
2294 | struct scrub_page *spage = sblock->pagev[index]; | |
2295 | int ret; | |
1bc87793 | 2296 | |
73ff61db OS |
2297 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
2298 | if (ret) { | |
2299 | scrub_block_put(sblock); | |
2300 | return ret; | |
2301 | } | |
b5d67f64 | 2302 | } |
a2de733c | 2303 | |
73ff61db OS |
2304 | if (force) |
2305 | scrub_submit(sctx); | |
2306 | } | |
a2de733c | 2307 | |
b5d67f64 SB |
2308 | /* last one frees, either here or in bio completion for last page */ |
2309 | scrub_block_put(sblock); | |
a2de733c AJ |
2310 | return 0; |
2311 | } | |
2312 | ||
4246a0b6 | 2313 | static void scrub_bio_end_io(struct bio *bio) |
b5d67f64 SB |
2314 | { |
2315 | struct scrub_bio *sbio = bio->bi_private; | |
fb456252 | 2316 | struct btrfs_fs_info *fs_info = sbio->dev->fs_info; |
b5d67f64 | 2317 | |
4e4cbee9 | 2318 | sbio->status = bio->bi_status; |
b5d67f64 SB |
2319 | sbio->bio = bio; |
2320 | ||
0339ef2f | 2321 | btrfs_queue_work(fs_info->scrub_workers, &sbio->work); |
b5d67f64 SB |
2322 | } |
2323 | ||
2324 | static void scrub_bio_end_io_worker(struct btrfs_work *work) | |
2325 | { | |
2326 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
d9d181c1 | 2327 | struct scrub_ctx *sctx = sbio->sctx; |
b5d67f64 SB |
2328 | int i; |
2329 | ||
ff023aac | 2330 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
4e4cbee9 | 2331 | if (sbio->status) { |
b5d67f64 SB |
2332 | for (i = 0; i < sbio->page_count; i++) { |
2333 | struct scrub_page *spage = sbio->pagev[i]; | |
2334 | ||
2335 | spage->io_error = 1; | |
2336 | spage->sblock->no_io_error_seen = 0; | |
2337 | } | |
2338 | } | |
2339 | ||
2340 | /* now complete the scrub_block items that have all pages completed */ | |
2341 | for (i = 0; i < sbio->page_count; i++) { | |
2342 | struct scrub_page *spage = sbio->pagev[i]; | |
2343 | struct scrub_block *sblock = spage->sblock; | |
2344 | ||
2345 | if (atomic_dec_and_test(&sblock->outstanding_pages)) | |
2346 | scrub_block_complete(sblock); | |
2347 | scrub_block_put(sblock); | |
2348 | } | |
2349 | ||
b5d67f64 SB |
2350 | bio_put(sbio->bio); |
2351 | sbio->bio = NULL; | |
d9d181c1 SB |
2352 | spin_lock(&sctx->list_lock); |
2353 | sbio->next_free = sctx->first_free; | |
2354 | sctx->first_free = sbio->index; | |
2355 | spin_unlock(&sctx->list_lock); | |
ff023aac | 2356 | |
2073c4c2 | 2357 | if (sctx->is_dev_replace && sctx->flush_all_writes) { |
3fb99303 | 2358 | mutex_lock(&sctx->wr_lock); |
ff023aac | 2359 | scrub_wr_submit(sctx); |
3fb99303 | 2360 | mutex_unlock(&sctx->wr_lock); |
ff023aac SB |
2361 | } |
2362 | ||
b6bfebc1 | 2363 | scrub_pending_bio_dec(sctx); |
b5d67f64 SB |
2364 | } |
2365 | ||
5a6ac9ea MX |
2366 | static inline void __scrub_mark_bitmap(struct scrub_parity *sparity, |
2367 | unsigned long *bitmap, | |
2368 | u64 start, u64 len) | |
2369 | { | |
972d7219 | 2370 | u64 offset; |
7736b0a4 DS |
2371 | u64 nsectors64; |
2372 | u32 nsectors; | |
da17066c | 2373 | int sectorsize = sparity->sctx->fs_info->sectorsize; |
5a6ac9ea MX |
2374 | |
2375 | if (len >= sparity->stripe_len) { | |
2376 | bitmap_set(bitmap, 0, sparity->nsectors); | |
2377 | return; | |
2378 | } | |
2379 | ||
2380 | start -= sparity->logic_start; | |
972d7219 LB |
2381 | start = div64_u64_rem(start, sparity->stripe_len, &offset); |
2382 | offset = div_u64(offset, sectorsize); | |
7736b0a4 DS |
2383 | nsectors64 = div_u64(len, sectorsize); |
2384 | ||
2385 | ASSERT(nsectors64 < UINT_MAX); | |
2386 | nsectors = (u32)nsectors64; | |
5a6ac9ea MX |
2387 | |
2388 | if (offset + nsectors <= sparity->nsectors) { | |
2389 | bitmap_set(bitmap, offset, nsectors); | |
2390 | return; | |
2391 | } | |
2392 | ||
2393 | bitmap_set(bitmap, offset, sparity->nsectors - offset); | |
2394 | bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset)); | |
2395 | } | |
2396 | ||
2397 | static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity, | |
2398 | u64 start, u64 len) | |
2399 | { | |
2400 | __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len); | |
2401 | } | |
2402 | ||
2403 | static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity, | |
2404 | u64 start, u64 len) | |
2405 | { | |
2406 | __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len); | |
2407 | } | |
2408 | ||
b5d67f64 SB |
2409 | static void scrub_block_complete(struct scrub_block *sblock) |
2410 | { | |
5a6ac9ea MX |
2411 | int corrupted = 0; |
2412 | ||
ff023aac | 2413 | if (!sblock->no_io_error_seen) { |
5a6ac9ea | 2414 | corrupted = 1; |
b5d67f64 | 2415 | scrub_handle_errored_block(sblock); |
ff023aac SB |
2416 | } else { |
2417 | /* | |
2418 | * if has checksum error, write via repair mechanism in | |
2419 | * dev replace case, otherwise write here in dev replace | |
2420 | * case. | |
2421 | */ | |
5a6ac9ea MX |
2422 | corrupted = scrub_checksum(sblock); |
2423 | if (!corrupted && sblock->sctx->is_dev_replace) | |
ff023aac SB |
2424 | scrub_write_block_to_dev_replace(sblock); |
2425 | } | |
5a6ac9ea MX |
2426 | |
2427 | if (sblock->sparity && corrupted && !sblock->data_corrected) { | |
2428 | u64 start = sblock->pagev[0]->logical; | |
2429 | u64 end = sblock->pagev[sblock->page_count - 1]->logical + | |
2430 | PAGE_SIZE; | |
2431 | ||
2432 | scrub_parity_mark_sectors_error(sblock->sparity, | |
2433 | start, end - start); | |
2434 | } | |
b5d67f64 SB |
2435 | } |
2436 | ||
3b5753ec | 2437 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u8 *csum) |
a2de733c AJ |
2438 | { |
2439 | struct btrfs_ordered_sum *sum = NULL; | |
f51a4a18 | 2440 | unsigned long index; |
a2de733c | 2441 | unsigned long num_sectors; |
a2de733c | 2442 | |
d9d181c1 SB |
2443 | while (!list_empty(&sctx->csum_list)) { |
2444 | sum = list_first_entry(&sctx->csum_list, | |
a2de733c AJ |
2445 | struct btrfs_ordered_sum, list); |
2446 | if (sum->bytenr > logical) | |
2447 | return 0; | |
2448 | if (sum->bytenr + sum->len > logical) | |
2449 | break; | |
2450 | ||
d9d181c1 | 2451 | ++sctx->stat.csum_discards; |
a2de733c AJ |
2452 | list_del(&sum->list); |
2453 | kfree(sum); | |
2454 | sum = NULL; | |
2455 | } | |
2456 | if (!sum) | |
2457 | return 0; | |
2458 | ||
1d1bf92d DS |
2459 | index = div_u64(logical - sum->bytenr, sctx->fs_info->sectorsize); |
2460 | ASSERT(index < UINT_MAX); | |
2461 | ||
25cc1226 | 2462 | num_sectors = sum->len / sctx->fs_info->sectorsize; |
1e25a2e3 | 2463 | memcpy(csum, sum->sums + index * sctx->csum_size, sctx->csum_size); |
f51a4a18 | 2464 | if (index == num_sectors - 1) { |
a2de733c AJ |
2465 | list_del(&sum->list); |
2466 | kfree(sum); | |
2467 | } | |
f51a4a18 | 2468 | return 1; |
a2de733c AJ |
2469 | } |
2470 | ||
2471 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
6ca1765b LB |
2472 | static int scrub_extent(struct scrub_ctx *sctx, struct map_lookup *map, |
2473 | u64 logical, u64 len, | |
a36cf8b8 | 2474 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac | 2475 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
a2de733c AJ |
2476 | { |
2477 | int ret; | |
2478 | u8 csum[BTRFS_CSUM_SIZE]; | |
b5d67f64 SB |
2479 | u32 blocksize; |
2480 | ||
2481 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
6ca1765b LB |
2482 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) |
2483 | blocksize = map->stripe_len; | |
2484 | else | |
2485 | blocksize = sctx->fs_info->sectorsize; | |
d9d181c1 SB |
2486 | spin_lock(&sctx->stat_lock); |
2487 | sctx->stat.data_extents_scrubbed++; | |
2488 | sctx->stat.data_bytes_scrubbed += len; | |
2489 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2490 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
6ca1765b LB |
2491 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) |
2492 | blocksize = map->stripe_len; | |
2493 | else | |
2494 | blocksize = sctx->fs_info->nodesize; | |
d9d181c1 SB |
2495 | spin_lock(&sctx->stat_lock); |
2496 | sctx->stat.tree_extents_scrubbed++; | |
2497 | sctx->stat.tree_bytes_scrubbed += len; | |
2498 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2499 | } else { |
25cc1226 | 2500 | blocksize = sctx->fs_info->sectorsize; |
ff023aac | 2501 | WARN_ON(1); |
b5d67f64 | 2502 | } |
a2de733c AJ |
2503 | |
2504 | while (len) { | |
b5d67f64 | 2505 | u64 l = min_t(u64, len, blocksize); |
a2de733c AJ |
2506 | int have_csum = 0; |
2507 | ||
2508 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2509 | /* push csums to sbio */ | |
3b5753ec | 2510 | have_csum = scrub_find_csum(sctx, logical, csum); |
a2de733c | 2511 | if (have_csum == 0) |
d9d181c1 | 2512 | ++sctx->stat.no_csum; |
a2de733c | 2513 | } |
a36cf8b8 | 2514 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
ff023aac SB |
2515 | mirror_num, have_csum ? csum : NULL, 0, |
2516 | physical_for_dev_replace); | |
a2de733c AJ |
2517 | if (ret) |
2518 | return ret; | |
2519 | len -= l; | |
2520 | logical += l; | |
2521 | physical += l; | |
ff023aac | 2522 | physical_for_dev_replace += l; |
a2de733c AJ |
2523 | } |
2524 | return 0; | |
2525 | } | |
2526 | ||
5a6ac9ea MX |
2527 | static int scrub_pages_for_parity(struct scrub_parity *sparity, |
2528 | u64 logical, u64 len, | |
2529 | u64 physical, struct btrfs_device *dev, | |
2530 | u64 flags, u64 gen, int mirror_num, u8 *csum) | |
2531 | { | |
2532 | struct scrub_ctx *sctx = sparity->sctx; | |
2533 | struct scrub_block *sblock; | |
2534 | int index; | |
2535 | ||
58c4e173 | 2536 | sblock = kzalloc(sizeof(*sblock), GFP_KERNEL); |
5a6ac9ea MX |
2537 | if (!sblock) { |
2538 | spin_lock(&sctx->stat_lock); | |
2539 | sctx->stat.malloc_errors++; | |
2540 | spin_unlock(&sctx->stat_lock); | |
2541 | return -ENOMEM; | |
2542 | } | |
2543 | ||
2544 | /* one ref inside this function, plus one for each page added to | |
2545 | * a bio later on */ | |
186debd6 | 2546 | refcount_set(&sblock->refs, 1); |
5a6ac9ea MX |
2547 | sblock->sctx = sctx; |
2548 | sblock->no_io_error_seen = 1; | |
2549 | sblock->sparity = sparity; | |
2550 | scrub_parity_get(sparity); | |
2551 | ||
2552 | for (index = 0; len > 0; index++) { | |
2553 | struct scrub_page *spage; | |
2554 | u64 l = min_t(u64, len, PAGE_SIZE); | |
2555 | ||
58c4e173 | 2556 | spage = kzalloc(sizeof(*spage), GFP_KERNEL); |
5a6ac9ea MX |
2557 | if (!spage) { |
2558 | leave_nomem: | |
2559 | spin_lock(&sctx->stat_lock); | |
2560 | sctx->stat.malloc_errors++; | |
2561 | spin_unlock(&sctx->stat_lock); | |
2562 | scrub_block_put(sblock); | |
2563 | return -ENOMEM; | |
2564 | } | |
2565 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); | |
2566 | /* For scrub block */ | |
2567 | scrub_page_get(spage); | |
2568 | sblock->pagev[index] = spage; | |
2569 | /* For scrub parity */ | |
2570 | scrub_page_get(spage); | |
2571 | list_add_tail(&spage->list, &sparity->spages); | |
2572 | spage->sblock = sblock; | |
2573 | spage->dev = dev; | |
2574 | spage->flags = flags; | |
2575 | spage->generation = gen; | |
2576 | spage->logical = logical; | |
2577 | spage->physical = physical; | |
2578 | spage->mirror_num = mirror_num; | |
2579 | if (csum) { | |
2580 | spage->have_csum = 1; | |
2581 | memcpy(spage->csum, csum, sctx->csum_size); | |
2582 | } else { | |
2583 | spage->have_csum = 0; | |
2584 | } | |
2585 | sblock->page_count++; | |
58c4e173 | 2586 | spage->page = alloc_page(GFP_KERNEL); |
5a6ac9ea MX |
2587 | if (!spage->page) |
2588 | goto leave_nomem; | |
2589 | len -= l; | |
2590 | logical += l; | |
2591 | physical += l; | |
2592 | } | |
2593 | ||
2594 | WARN_ON(sblock->page_count == 0); | |
2595 | for (index = 0; index < sblock->page_count; index++) { | |
2596 | struct scrub_page *spage = sblock->pagev[index]; | |
2597 | int ret; | |
2598 | ||
2599 | ret = scrub_add_page_to_rd_bio(sctx, spage); | |
2600 | if (ret) { | |
2601 | scrub_block_put(sblock); | |
2602 | return ret; | |
2603 | } | |
2604 | } | |
2605 | ||
2606 | /* last one frees, either here or in bio completion for last page */ | |
2607 | scrub_block_put(sblock); | |
2608 | return 0; | |
2609 | } | |
2610 | ||
2611 | static int scrub_extent_for_parity(struct scrub_parity *sparity, | |
2612 | u64 logical, u64 len, | |
2613 | u64 physical, struct btrfs_device *dev, | |
2614 | u64 flags, u64 gen, int mirror_num) | |
2615 | { | |
2616 | struct scrub_ctx *sctx = sparity->sctx; | |
2617 | int ret; | |
2618 | u8 csum[BTRFS_CSUM_SIZE]; | |
2619 | u32 blocksize; | |
2620 | ||
e6e674bd | 2621 | if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) { |
4a770891 OS |
2622 | scrub_parity_mark_sectors_error(sparity, logical, len); |
2623 | return 0; | |
2624 | } | |
2625 | ||
5a6ac9ea | 2626 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
6ca1765b | 2627 | blocksize = sparity->stripe_len; |
5a6ac9ea | 2628 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
6ca1765b | 2629 | blocksize = sparity->stripe_len; |
5a6ac9ea | 2630 | } else { |
25cc1226 | 2631 | blocksize = sctx->fs_info->sectorsize; |
5a6ac9ea MX |
2632 | WARN_ON(1); |
2633 | } | |
2634 | ||
2635 | while (len) { | |
2636 | u64 l = min_t(u64, len, blocksize); | |
2637 | int have_csum = 0; | |
2638 | ||
2639 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2640 | /* push csums to sbio */ | |
3b5753ec | 2641 | have_csum = scrub_find_csum(sctx, logical, csum); |
5a6ac9ea MX |
2642 | if (have_csum == 0) |
2643 | goto skip; | |
2644 | } | |
2645 | ret = scrub_pages_for_parity(sparity, logical, l, physical, dev, | |
2646 | flags, gen, mirror_num, | |
2647 | have_csum ? csum : NULL); | |
5a6ac9ea MX |
2648 | if (ret) |
2649 | return ret; | |
6b6d24b3 | 2650 | skip: |
5a6ac9ea MX |
2651 | len -= l; |
2652 | logical += l; | |
2653 | physical += l; | |
2654 | } | |
2655 | return 0; | |
2656 | } | |
2657 | ||
3b080b25 WS |
2658 | /* |
2659 | * Given a physical address, this will calculate it's | |
2660 | * logical offset. if this is a parity stripe, it will return | |
2661 | * the most left data stripe's logical offset. | |
2662 | * | |
2663 | * return 0 if it is a data stripe, 1 means parity stripe. | |
2664 | */ | |
2665 | static int get_raid56_logic_offset(u64 physical, int num, | |
5a6ac9ea MX |
2666 | struct map_lookup *map, u64 *offset, |
2667 | u64 *stripe_start) | |
3b080b25 WS |
2668 | { |
2669 | int i; | |
2670 | int j = 0; | |
2671 | u64 stripe_nr; | |
2672 | u64 last_offset; | |
9d644a62 DS |
2673 | u32 stripe_index; |
2674 | u32 rot; | |
cff82672 | 2675 | const int data_stripes = nr_data_stripes(map); |
3b080b25 | 2676 | |
cff82672 | 2677 | last_offset = (physical - map->stripes[num].physical) * data_stripes; |
5a6ac9ea MX |
2678 | if (stripe_start) |
2679 | *stripe_start = last_offset; | |
2680 | ||
3b080b25 | 2681 | *offset = last_offset; |
cff82672 | 2682 | for (i = 0; i < data_stripes; i++) { |
3b080b25 WS |
2683 | *offset = last_offset + i * map->stripe_len; |
2684 | ||
42c61ab6 | 2685 | stripe_nr = div64_u64(*offset, map->stripe_len); |
cff82672 | 2686 | stripe_nr = div_u64(stripe_nr, data_stripes); |
3b080b25 WS |
2687 | |
2688 | /* Work out the disk rotation on this stripe-set */ | |
47c5713f | 2689 | stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot); |
3b080b25 WS |
2690 | /* calculate which stripe this data locates */ |
2691 | rot += i; | |
e4fbaee2 | 2692 | stripe_index = rot % map->num_stripes; |
3b080b25 WS |
2693 | if (stripe_index == num) |
2694 | return 0; | |
2695 | if (stripe_index < num) | |
2696 | j++; | |
2697 | } | |
2698 | *offset = last_offset + j * map->stripe_len; | |
2699 | return 1; | |
2700 | } | |
2701 | ||
5a6ac9ea MX |
2702 | static void scrub_free_parity(struct scrub_parity *sparity) |
2703 | { | |
2704 | struct scrub_ctx *sctx = sparity->sctx; | |
2705 | struct scrub_page *curr, *next; | |
2706 | int nbits; | |
2707 | ||
2708 | nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors); | |
2709 | if (nbits) { | |
2710 | spin_lock(&sctx->stat_lock); | |
2711 | sctx->stat.read_errors += nbits; | |
2712 | sctx->stat.uncorrectable_errors += nbits; | |
2713 | spin_unlock(&sctx->stat_lock); | |
2714 | } | |
2715 | ||
2716 | list_for_each_entry_safe(curr, next, &sparity->spages, list) { | |
2717 | list_del_init(&curr->list); | |
2718 | scrub_page_put(curr); | |
2719 | } | |
2720 | ||
2721 | kfree(sparity); | |
2722 | } | |
2723 | ||
20b2e302 ZL |
2724 | static void scrub_parity_bio_endio_worker(struct btrfs_work *work) |
2725 | { | |
2726 | struct scrub_parity *sparity = container_of(work, struct scrub_parity, | |
2727 | work); | |
2728 | struct scrub_ctx *sctx = sparity->sctx; | |
2729 | ||
2730 | scrub_free_parity(sparity); | |
2731 | scrub_pending_bio_dec(sctx); | |
2732 | } | |
2733 | ||
4246a0b6 | 2734 | static void scrub_parity_bio_endio(struct bio *bio) |
5a6ac9ea MX |
2735 | { |
2736 | struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private; | |
0b246afa | 2737 | struct btrfs_fs_info *fs_info = sparity->sctx->fs_info; |
5a6ac9ea | 2738 | |
4e4cbee9 | 2739 | if (bio->bi_status) |
5a6ac9ea MX |
2740 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, |
2741 | sparity->nsectors); | |
2742 | ||
5a6ac9ea | 2743 | bio_put(bio); |
20b2e302 ZL |
2744 | |
2745 | btrfs_init_work(&sparity->work, btrfs_scrubparity_helper, | |
2746 | scrub_parity_bio_endio_worker, NULL, NULL); | |
0b246afa | 2747 | btrfs_queue_work(fs_info->scrub_parity_workers, &sparity->work); |
5a6ac9ea MX |
2748 | } |
2749 | ||
2750 | static void scrub_parity_check_and_repair(struct scrub_parity *sparity) | |
2751 | { | |
2752 | struct scrub_ctx *sctx = sparity->sctx; | |
0b246afa | 2753 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
5a6ac9ea MX |
2754 | struct bio *bio; |
2755 | struct btrfs_raid_bio *rbio; | |
5a6ac9ea | 2756 | struct btrfs_bio *bbio = NULL; |
5a6ac9ea MX |
2757 | u64 length; |
2758 | int ret; | |
2759 | ||
2760 | if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap, | |
2761 | sparity->nsectors)) | |
2762 | goto out; | |
2763 | ||
a0dd59de | 2764 | length = sparity->logic_end - sparity->logic_start; |
ae6529c3 QW |
2765 | |
2766 | btrfs_bio_counter_inc_blocked(fs_info); | |
0b246afa | 2767 | ret = btrfs_map_sblock(fs_info, BTRFS_MAP_WRITE, sparity->logic_start, |
825ad4c9 | 2768 | &length, &bbio); |
8e5cfb55 | 2769 | if (ret || !bbio || !bbio->raid_map) |
5a6ac9ea MX |
2770 | goto bbio_out; |
2771 | ||
c5e4c3d7 | 2772 | bio = btrfs_io_bio_alloc(0); |
5a6ac9ea MX |
2773 | bio->bi_iter.bi_sector = sparity->logic_start >> 9; |
2774 | bio->bi_private = sparity; | |
2775 | bio->bi_end_io = scrub_parity_bio_endio; | |
2776 | ||
2ff7e61e | 2777 | rbio = raid56_parity_alloc_scrub_rbio(fs_info, bio, bbio, |
8e5cfb55 | 2778 | length, sparity->scrub_dev, |
5a6ac9ea MX |
2779 | sparity->dbitmap, |
2780 | sparity->nsectors); | |
2781 | if (!rbio) | |
2782 | goto rbio_out; | |
2783 | ||
5a6ac9ea MX |
2784 | scrub_pending_bio_inc(sctx); |
2785 | raid56_parity_submit_scrub_rbio(rbio); | |
2786 | return; | |
2787 | ||
2788 | rbio_out: | |
2789 | bio_put(bio); | |
2790 | bbio_out: | |
ae6529c3 | 2791 | btrfs_bio_counter_dec(fs_info); |
6e9606d2 | 2792 | btrfs_put_bbio(bbio); |
5a6ac9ea MX |
2793 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, |
2794 | sparity->nsectors); | |
2795 | spin_lock(&sctx->stat_lock); | |
2796 | sctx->stat.malloc_errors++; | |
2797 | spin_unlock(&sctx->stat_lock); | |
2798 | out: | |
2799 | scrub_free_parity(sparity); | |
2800 | } | |
2801 | ||
2802 | static inline int scrub_calc_parity_bitmap_len(int nsectors) | |
2803 | { | |
bfca9a6d | 2804 | return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * sizeof(long); |
5a6ac9ea MX |
2805 | } |
2806 | ||
2807 | static void scrub_parity_get(struct scrub_parity *sparity) | |
2808 | { | |
78a76450 | 2809 | refcount_inc(&sparity->refs); |
5a6ac9ea MX |
2810 | } |
2811 | ||
2812 | static void scrub_parity_put(struct scrub_parity *sparity) | |
2813 | { | |
78a76450 | 2814 | if (!refcount_dec_and_test(&sparity->refs)) |
5a6ac9ea MX |
2815 | return; |
2816 | ||
2817 | scrub_parity_check_and_repair(sparity); | |
2818 | } | |
2819 | ||
2820 | static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, | |
2821 | struct map_lookup *map, | |
2822 | struct btrfs_device *sdev, | |
2823 | struct btrfs_path *path, | |
2824 | u64 logic_start, | |
2825 | u64 logic_end) | |
2826 | { | |
fb456252 | 2827 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
5a6ac9ea MX |
2828 | struct btrfs_root *root = fs_info->extent_root; |
2829 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2830 | struct btrfs_extent_item *extent; | |
4a770891 | 2831 | struct btrfs_bio *bbio = NULL; |
5a6ac9ea MX |
2832 | u64 flags; |
2833 | int ret; | |
2834 | int slot; | |
2835 | struct extent_buffer *l; | |
2836 | struct btrfs_key key; | |
2837 | u64 generation; | |
2838 | u64 extent_logical; | |
2839 | u64 extent_physical; | |
2840 | u64 extent_len; | |
4a770891 | 2841 | u64 mapped_length; |
5a6ac9ea MX |
2842 | struct btrfs_device *extent_dev; |
2843 | struct scrub_parity *sparity; | |
2844 | int nsectors; | |
2845 | int bitmap_len; | |
2846 | int extent_mirror_num; | |
2847 | int stop_loop = 0; | |
2848 | ||
0b246afa | 2849 | nsectors = div_u64(map->stripe_len, fs_info->sectorsize); |
5a6ac9ea MX |
2850 | bitmap_len = scrub_calc_parity_bitmap_len(nsectors); |
2851 | sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len, | |
2852 | GFP_NOFS); | |
2853 | if (!sparity) { | |
2854 | spin_lock(&sctx->stat_lock); | |
2855 | sctx->stat.malloc_errors++; | |
2856 | spin_unlock(&sctx->stat_lock); | |
2857 | return -ENOMEM; | |
2858 | } | |
2859 | ||
2860 | sparity->stripe_len = map->stripe_len; | |
2861 | sparity->nsectors = nsectors; | |
2862 | sparity->sctx = sctx; | |
2863 | sparity->scrub_dev = sdev; | |
2864 | sparity->logic_start = logic_start; | |
2865 | sparity->logic_end = logic_end; | |
78a76450 | 2866 | refcount_set(&sparity->refs, 1); |
5a6ac9ea MX |
2867 | INIT_LIST_HEAD(&sparity->spages); |
2868 | sparity->dbitmap = sparity->bitmap; | |
2869 | sparity->ebitmap = (void *)sparity->bitmap + bitmap_len; | |
2870 | ||
2871 | ret = 0; | |
2872 | while (logic_start < logic_end) { | |
2873 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) | |
2874 | key.type = BTRFS_METADATA_ITEM_KEY; | |
2875 | else | |
2876 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2877 | key.objectid = logic_start; | |
2878 | key.offset = (u64)-1; | |
2879 | ||
2880 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2881 | if (ret < 0) | |
2882 | goto out; | |
2883 | ||
2884 | if (ret > 0) { | |
2885 | ret = btrfs_previous_extent_item(root, path, 0); | |
2886 | if (ret < 0) | |
2887 | goto out; | |
2888 | if (ret > 0) { | |
2889 | btrfs_release_path(path); | |
2890 | ret = btrfs_search_slot(NULL, root, &key, | |
2891 | path, 0, 0); | |
2892 | if (ret < 0) | |
2893 | goto out; | |
2894 | } | |
2895 | } | |
2896 | ||
2897 | stop_loop = 0; | |
2898 | while (1) { | |
2899 | u64 bytes; | |
2900 | ||
2901 | l = path->nodes[0]; | |
2902 | slot = path->slots[0]; | |
2903 | if (slot >= btrfs_header_nritems(l)) { | |
2904 | ret = btrfs_next_leaf(root, path); | |
2905 | if (ret == 0) | |
2906 | continue; | |
2907 | if (ret < 0) | |
2908 | goto out; | |
2909 | ||
2910 | stop_loop = 1; | |
2911 | break; | |
2912 | } | |
2913 | btrfs_item_key_to_cpu(l, &key, slot); | |
2914 | ||
d7cad238 ZL |
2915 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
2916 | key.type != BTRFS_METADATA_ITEM_KEY) | |
2917 | goto next; | |
2918 | ||
5a6ac9ea | 2919 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
0b246afa | 2920 | bytes = fs_info->nodesize; |
5a6ac9ea MX |
2921 | else |
2922 | bytes = key.offset; | |
2923 | ||
2924 | if (key.objectid + bytes <= logic_start) | |
2925 | goto next; | |
2926 | ||
a0dd59de | 2927 | if (key.objectid >= logic_end) { |
5a6ac9ea MX |
2928 | stop_loop = 1; |
2929 | break; | |
2930 | } | |
2931 | ||
2932 | while (key.objectid >= logic_start + map->stripe_len) | |
2933 | logic_start += map->stripe_len; | |
2934 | ||
2935 | extent = btrfs_item_ptr(l, slot, | |
2936 | struct btrfs_extent_item); | |
2937 | flags = btrfs_extent_flags(l, extent); | |
2938 | generation = btrfs_extent_generation(l, extent); | |
2939 | ||
a323e813 ZL |
2940 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && |
2941 | (key.objectid < logic_start || | |
2942 | key.objectid + bytes > | |
2943 | logic_start + map->stripe_len)) { | |
5d163e0e JM |
2944 | btrfs_err(fs_info, |
2945 | "scrub: tree block %llu spanning stripes, ignored. logical=%llu", | |
a323e813 | 2946 | key.objectid, logic_start); |
9799d2c3 ZL |
2947 | spin_lock(&sctx->stat_lock); |
2948 | sctx->stat.uncorrectable_errors++; | |
2949 | spin_unlock(&sctx->stat_lock); | |
5a6ac9ea MX |
2950 | goto next; |
2951 | } | |
2952 | again: | |
2953 | extent_logical = key.objectid; | |
2954 | extent_len = bytes; | |
2955 | ||
2956 | if (extent_logical < logic_start) { | |
2957 | extent_len -= logic_start - extent_logical; | |
2958 | extent_logical = logic_start; | |
2959 | } | |
2960 | ||
2961 | if (extent_logical + extent_len > | |
2962 | logic_start + map->stripe_len) | |
2963 | extent_len = logic_start + map->stripe_len - | |
2964 | extent_logical; | |
2965 | ||
2966 | scrub_parity_mark_sectors_data(sparity, extent_logical, | |
2967 | extent_len); | |
2968 | ||
4a770891 | 2969 | mapped_length = extent_len; |
f1fee653 | 2970 | bbio = NULL; |
cf8cddd3 CH |
2971 | ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, |
2972 | extent_logical, &mapped_length, &bbio, | |
2973 | 0); | |
4a770891 OS |
2974 | if (!ret) { |
2975 | if (!bbio || mapped_length < extent_len) | |
2976 | ret = -EIO; | |
2977 | } | |
2978 | if (ret) { | |
2979 | btrfs_put_bbio(bbio); | |
2980 | goto out; | |
2981 | } | |
2982 | extent_physical = bbio->stripes[0].physical; | |
2983 | extent_mirror_num = bbio->mirror_num; | |
2984 | extent_dev = bbio->stripes[0].dev; | |
2985 | btrfs_put_bbio(bbio); | |
5a6ac9ea MX |
2986 | |
2987 | ret = btrfs_lookup_csums_range(csum_root, | |
2988 | extent_logical, | |
2989 | extent_logical + extent_len - 1, | |
2990 | &sctx->csum_list, 1); | |
2991 | if (ret) | |
2992 | goto out; | |
2993 | ||
2994 | ret = scrub_extent_for_parity(sparity, extent_logical, | |
2995 | extent_len, | |
2996 | extent_physical, | |
2997 | extent_dev, flags, | |
2998 | generation, | |
2999 | extent_mirror_num); | |
6fa96d72 ZL |
3000 | |
3001 | scrub_free_csums(sctx); | |
3002 | ||
5a6ac9ea MX |
3003 | if (ret) |
3004 | goto out; | |
3005 | ||
5a6ac9ea MX |
3006 | if (extent_logical + extent_len < |
3007 | key.objectid + bytes) { | |
3008 | logic_start += map->stripe_len; | |
3009 | ||
3010 | if (logic_start >= logic_end) { | |
3011 | stop_loop = 1; | |
3012 | break; | |
3013 | } | |
3014 | ||
3015 | if (logic_start < key.objectid + bytes) { | |
3016 | cond_resched(); | |
3017 | goto again; | |
3018 | } | |
3019 | } | |
3020 | next: | |
3021 | path->slots[0]++; | |
3022 | } | |
3023 | ||
3024 | btrfs_release_path(path); | |
3025 | ||
3026 | if (stop_loop) | |
3027 | break; | |
3028 | ||
3029 | logic_start += map->stripe_len; | |
3030 | } | |
3031 | out: | |
3032 | if (ret < 0) | |
3033 | scrub_parity_mark_sectors_error(sparity, logic_start, | |
a0dd59de | 3034 | logic_end - logic_start); |
5a6ac9ea MX |
3035 | scrub_parity_put(sparity); |
3036 | scrub_submit(sctx); | |
3fb99303 | 3037 | mutex_lock(&sctx->wr_lock); |
5a6ac9ea | 3038 | scrub_wr_submit(sctx); |
3fb99303 | 3039 | mutex_unlock(&sctx->wr_lock); |
5a6ac9ea MX |
3040 | |
3041 | btrfs_release_path(path); | |
3042 | return ret < 0 ? ret : 0; | |
3043 | } | |
3044 | ||
d9d181c1 | 3045 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
a36cf8b8 SB |
3046 | struct map_lookup *map, |
3047 | struct btrfs_device *scrub_dev, | |
32934280 | 3048 | int num, u64 base, u64 length) |
a2de733c | 3049 | { |
5a6ac9ea | 3050 | struct btrfs_path *path, *ppath; |
fb456252 | 3051 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
a2de733c AJ |
3052 | struct btrfs_root *root = fs_info->extent_root; |
3053 | struct btrfs_root *csum_root = fs_info->csum_root; | |
3054 | struct btrfs_extent_item *extent; | |
e7786c3a | 3055 | struct blk_plug plug; |
a2de733c AJ |
3056 | u64 flags; |
3057 | int ret; | |
3058 | int slot; | |
a2de733c | 3059 | u64 nstripes; |
a2de733c | 3060 | struct extent_buffer *l; |
a2de733c AJ |
3061 | u64 physical; |
3062 | u64 logical; | |
625f1c8d | 3063 | u64 logic_end; |
3b080b25 | 3064 | u64 physical_end; |
a2de733c | 3065 | u64 generation; |
e12fa9cd | 3066 | int mirror_num; |
7a26285e AJ |
3067 | struct reada_control *reada1; |
3068 | struct reada_control *reada2; | |
e6c11f9a | 3069 | struct btrfs_key key; |
7a26285e | 3070 | struct btrfs_key key_end; |
a2de733c AJ |
3071 | u64 increment = map->stripe_len; |
3072 | u64 offset; | |
ff023aac SB |
3073 | u64 extent_logical; |
3074 | u64 extent_physical; | |
3075 | u64 extent_len; | |
5a6ac9ea MX |
3076 | u64 stripe_logical; |
3077 | u64 stripe_end; | |
ff023aac SB |
3078 | struct btrfs_device *extent_dev; |
3079 | int extent_mirror_num; | |
3b080b25 | 3080 | int stop_loop = 0; |
53b381b3 | 3081 | |
3b080b25 | 3082 | physical = map->stripes[num].physical; |
a2de733c | 3083 | offset = 0; |
42c61ab6 | 3084 | nstripes = div64_u64(length, map->stripe_len); |
a2de733c AJ |
3085 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
3086 | offset = map->stripe_len * num; | |
3087 | increment = map->stripe_len * map->num_stripes; | |
193ea74b | 3088 | mirror_num = 1; |
a2de733c AJ |
3089 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
3090 | int factor = map->num_stripes / map->sub_stripes; | |
3091 | offset = map->stripe_len * (num / map->sub_stripes); | |
3092 | increment = map->stripe_len * factor; | |
193ea74b | 3093 | mirror_num = num % map->sub_stripes + 1; |
c7369b3f | 3094 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1_MASK) { |
a2de733c | 3095 | increment = map->stripe_len; |
193ea74b | 3096 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
3097 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
3098 | increment = map->stripe_len; | |
193ea74b | 3099 | mirror_num = num % map->num_stripes + 1; |
ffe2d203 | 3100 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
5a6ac9ea | 3101 | get_raid56_logic_offset(physical, num, map, &offset, NULL); |
3b080b25 WS |
3102 | increment = map->stripe_len * nr_data_stripes(map); |
3103 | mirror_num = 1; | |
a2de733c AJ |
3104 | } else { |
3105 | increment = map->stripe_len; | |
193ea74b | 3106 | mirror_num = 1; |
a2de733c AJ |
3107 | } |
3108 | ||
3109 | path = btrfs_alloc_path(); | |
3110 | if (!path) | |
3111 | return -ENOMEM; | |
3112 | ||
5a6ac9ea MX |
3113 | ppath = btrfs_alloc_path(); |
3114 | if (!ppath) { | |
379d6854 | 3115 | btrfs_free_path(path); |
5a6ac9ea MX |
3116 | return -ENOMEM; |
3117 | } | |
3118 | ||
b5d67f64 SB |
3119 | /* |
3120 | * work on commit root. The related disk blocks are static as | |
3121 | * long as COW is applied. This means, it is save to rewrite | |
3122 | * them to repair disk errors without any race conditions | |
3123 | */ | |
a2de733c AJ |
3124 | path->search_commit_root = 1; |
3125 | path->skip_locking = 1; | |
3126 | ||
063c54dc GH |
3127 | ppath->search_commit_root = 1; |
3128 | ppath->skip_locking = 1; | |
a2de733c | 3129 | /* |
7a26285e AJ |
3130 | * trigger the readahead for extent tree csum tree and wait for |
3131 | * completion. During readahead, the scrub is officially paused | |
3132 | * to not hold off transaction commits | |
a2de733c AJ |
3133 | */ |
3134 | logical = base + offset; | |
3b080b25 | 3135 | physical_end = physical + nstripes * map->stripe_len; |
ffe2d203 | 3136 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3b080b25 | 3137 | get_raid56_logic_offset(physical_end, num, |
5a6ac9ea | 3138 | map, &logic_end, NULL); |
3b080b25 WS |
3139 | logic_end += base; |
3140 | } else { | |
3141 | logic_end = logical + increment * nstripes; | |
3142 | } | |
d9d181c1 | 3143 | wait_event(sctx->list_wait, |
b6bfebc1 | 3144 | atomic_read(&sctx->bios_in_flight) == 0); |
cb7ab021 | 3145 | scrub_blocked_if_needed(fs_info); |
7a26285e AJ |
3146 | |
3147 | /* FIXME it might be better to start readahead at commit root */ | |
e6c11f9a DS |
3148 | key.objectid = logical; |
3149 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
3150 | key.offset = (u64)0; | |
3b080b25 | 3151 | key_end.objectid = logic_end; |
3173a18f JB |
3152 | key_end.type = BTRFS_METADATA_ITEM_KEY; |
3153 | key_end.offset = (u64)-1; | |
e6c11f9a | 3154 | reada1 = btrfs_reada_add(root, &key, &key_end); |
7a26285e | 3155 | |
e6c11f9a DS |
3156 | key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
3157 | key.type = BTRFS_EXTENT_CSUM_KEY; | |
3158 | key.offset = logical; | |
7a26285e AJ |
3159 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
3160 | key_end.type = BTRFS_EXTENT_CSUM_KEY; | |
3b080b25 | 3161 | key_end.offset = logic_end; |
e6c11f9a | 3162 | reada2 = btrfs_reada_add(csum_root, &key, &key_end); |
7a26285e AJ |
3163 | |
3164 | if (!IS_ERR(reada1)) | |
3165 | btrfs_reada_wait(reada1); | |
3166 | if (!IS_ERR(reada2)) | |
3167 | btrfs_reada_wait(reada2); | |
3168 | ||
a2de733c AJ |
3169 | |
3170 | /* | |
3171 | * collect all data csums for the stripe to avoid seeking during | |
3172 | * the scrub. This might currently (crc32) end up to be about 1MB | |
3173 | */ | |
e7786c3a | 3174 | blk_start_plug(&plug); |
a2de733c | 3175 | |
a2de733c AJ |
3176 | /* |
3177 | * now find all extents for each stripe and scrub them | |
3178 | */ | |
a2de733c | 3179 | ret = 0; |
3b080b25 | 3180 | while (physical < physical_end) { |
a2de733c AJ |
3181 | /* |
3182 | * canceled? | |
3183 | */ | |
3184 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
d9d181c1 | 3185 | atomic_read(&sctx->cancel_req)) { |
a2de733c AJ |
3186 | ret = -ECANCELED; |
3187 | goto out; | |
3188 | } | |
3189 | /* | |
3190 | * check to see if we have to pause | |
3191 | */ | |
3192 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
3193 | /* push queued extents */ | |
2073c4c2 | 3194 | sctx->flush_all_writes = true; |
d9d181c1 | 3195 | scrub_submit(sctx); |
3fb99303 | 3196 | mutex_lock(&sctx->wr_lock); |
ff023aac | 3197 | scrub_wr_submit(sctx); |
3fb99303 | 3198 | mutex_unlock(&sctx->wr_lock); |
d9d181c1 | 3199 | wait_event(sctx->list_wait, |
b6bfebc1 | 3200 | atomic_read(&sctx->bios_in_flight) == 0); |
2073c4c2 | 3201 | sctx->flush_all_writes = false; |
3cb0929a | 3202 | scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3203 | } |
3204 | ||
f2f66a2f ZL |
3205 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3206 | ret = get_raid56_logic_offset(physical, num, map, | |
3207 | &logical, | |
3208 | &stripe_logical); | |
3209 | logical += base; | |
3210 | if (ret) { | |
7955323b | 3211 | /* it is parity strip */ |
f2f66a2f | 3212 | stripe_logical += base; |
a0dd59de | 3213 | stripe_end = stripe_logical + increment; |
f2f66a2f ZL |
3214 | ret = scrub_raid56_parity(sctx, map, scrub_dev, |
3215 | ppath, stripe_logical, | |
3216 | stripe_end); | |
3217 | if (ret) | |
3218 | goto out; | |
3219 | goto skip; | |
3220 | } | |
3221 | } | |
3222 | ||
7c76edb7 WS |
3223 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
3224 | key.type = BTRFS_METADATA_ITEM_KEY; | |
3225 | else | |
3226 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
a2de733c | 3227 | key.objectid = logical; |
625f1c8d | 3228 | key.offset = (u64)-1; |
a2de733c AJ |
3229 | |
3230 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3231 | if (ret < 0) | |
3232 | goto out; | |
3173a18f | 3233 | |
8c51032f | 3234 | if (ret > 0) { |
ade2e0b3 | 3235 | ret = btrfs_previous_extent_item(root, path, 0); |
a2de733c AJ |
3236 | if (ret < 0) |
3237 | goto out; | |
8c51032f AJ |
3238 | if (ret > 0) { |
3239 | /* there's no smaller item, so stick with the | |
3240 | * larger one */ | |
3241 | btrfs_release_path(path); | |
3242 | ret = btrfs_search_slot(NULL, root, &key, | |
3243 | path, 0, 0); | |
3244 | if (ret < 0) | |
3245 | goto out; | |
3246 | } | |
a2de733c AJ |
3247 | } |
3248 | ||
625f1c8d | 3249 | stop_loop = 0; |
a2de733c | 3250 | while (1) { |
3173a18f JB |
3251 | u64 bytes; |
3252 | ||
a2de733c AJ |
3253 | l = path->nodes[0]; |
3254 | slot = path->slots[0]; | |
3255 | if (slot >= btrfs_header_nritems(l)) { | |
3256 | ret = btrfs_next_leaf(root, path); | |
3257 | if (ret == 0) | |
3258 | continue; | |
3259 | if (ret < 0) | |
3260 | goto out; | |
3261 | ||
625f1c8d | 3262 | stop_loop = 1; |
a2de733c AJ |
3263 | break; |
3264 | } | |
3265 | btrfs_item_key_to_cpu(l, &key, slot); | |
3266 | ||
d7cad238 ZL |
3267 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
3268 | key.type != BTRFS_METADATA_ITEM_KEY) | |
3269 | goto next; | |
3270 | ||
3173a18f | 3271 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
0b246afa | 3272 | bytes = fs_info->nodesize; |
3173a18f JB |
3273 | else |
3274 | bytes = key.offset; | |
3275 | ||
3276 | if (key.objectid + bytes <= logical) | |
a2de733c AJ |
3277 | goto next; |
3278 | ||
625f1c8d LB |
3279 | if (key.objectid >= logical + map->stripe_len) { |
3280 | /* out of this device extent */ | |
3281 | if (key.objectid >= logic_end) | |
3282 | stop_loop = 1; | |
3283 | break; | |
3284 | } | |
a2de733c AJ |
3285 | |
3286 | extent = btrfs_item_ptr(l, slot, | |
3287 | struct btrfs_extent_item); | |
3288 | flags = btrfs_extent_flags(l, extent); | |
3289 | generation = btrfs_extent_generation(l, extent); | |
3290 | ||
a323e813 ZL |
3291 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && |
3292 | (key.objectid < logical || | |
3293 | key.objectid + bytes > | |
3294 | logical + map->stripe_len)) { | |
efe120a0 | 3295 | btrfs_err(fs_info, |
5d163e0e | 3296 | "scrub: tree block %llu spanning stripes, ignored. logical=%llu", |
c1c9ff7c | 3297 | key.objectid, logical); |
9799d2c3 ZL |
3298 | spin_lock(&sctx->stat_lock); |
3299 | sctx->stat.uncorrectable_errors++; | |
3300 | spin_unlock(&sctx->stat_lock); | |
a2de733c AJ |
3301 | goto next; |
3302 | } | |
3303 | ||
625f1c8d LB |
3304 | again: |
3305 | extent_logical = key.objectid; | |
3306 | extent_len = bytes; | |
3307 | ||
a2de733c AJ |
3308 | /* |
3309 | * trim extent to this stripe | |
3310 | */ | |
625f1c8d LB |
3311 | if (extent_logical < logical) { |
3312 | extent_len -= logical - extent_logical; | |
3313 | extent_logical = logical; | |
a2de733c | 3314 | } |
625f1c8d | 3315 | if (extent_logical + extent_len > |
a2de733c | 3316 | logical + map->stripe_len) { |
625f1c8d LB |
3317 | extent_len = logical + map->stripe_len - |
3318 | extent_logical; | |
a2de733c AJ |
3319 | } |
3320 | ||
625f1c8d | 3321 | extent_physical = extent_logical - logical + physical; |
ff023aac SB |
3322 | extent_dev = scrub_dev; |
3323 | extent_mirror_num = mirror_num; | |
32934280 | 3324 | if (sctx->is_dev_replace) |
ff023aac SB |
3325 | scrub_remap_extent(fs_info, extent_logical, |
3326 | extent_len, &extent_physical, | |
3327 | &extent_dev, | |
3328 | &extent_mirror_num); | |
625f1c8d | 3329 | |
fe8cf654 ZL |
3330 | ret = btrfs_lookup_csums_range(csum_root, |
3331 | extent_logical, | |
3332 | extent_logical + | |
3333 | extent_len - 1, | |
3334 | &sctx->csum_list, 1); | |
625f1c8d LB |
3335 | if (ret) |
3336 | goto out; | |
3337 | ||
6ca1765b | 3338 | ret = scrub_extent(sctx, map, extent_logical, extent_len, |
ff023aac SB |
3339 | extent_physical, extent_dev, flags, |
3340 | generation, extent_mirror_num, | |
115930cb | 3341 | extent_logical - logical + physical); |
6fa96d72 ZL |
3342 | |
3343 | scrub_free_csums(sctx); | |
3344 | ||
a2de733c AJ |
3345 | if (ret) |
3346 | goto out; | |
3347 | ||
625f1c8d LB |
3348 | if (extent_logical + extent_len < |
3349 | key.objectid + bytes) { | |
ffe2d203 | 3350 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3b080b25 WS |
3351 | /* |
3352 | * loop until we find next data stripe | |
3353 | * or we have finished all stripes. | |
3354 | */ | |
5a6ac9ea MX |
3355 | loop: |
3356 | physical += map->stripe_len; | |
3357 | ret = get_raid56_logic_offset(physical, | |
3358 | num, map, &logical, | |
3359 | &stripe_logical); | |
3360 | logical += base; | |
3361 | ||
3362 | if (ret && physical < physical_end) { | |
3363 | stripe_logical += base; | |
3364 | stripe_end = stripe_logical + | |
a0dd59de | 3365 | increment; |
5a6ac9ea MX |
3366 | ret = scrub_raid56_parity(sctx, |
3367 | map, scrub_dev, ppath, | |
3368 | stripe_logical, | |
3369 | stripe_end); | |
3370 | if (ret) | |
3371 | goto out; | |
3372 | goto loop; | |
3373 | } | |
3b080b25 WS |
3374 | } else { |
3375 | physical += map->stripe_len; | |
3376 | logical += increment; | |
3377 | } | |
625f1c8d LB |
3378 | if (logical < key.objectid + bytes) { |
3379 | cond_resched(); | |
3380 | goto again; | |
3381 | } | |
3382 | ||
3b080b25 | 3383 | if (physical >= physical_end) { |
625f1c8d LB |
3384 | stop_loop = 1; |
3385 | break; | |
3386 | } | |
3387 | } | |
a2de733c AJ |
3388 | next: |
3389 | path->slots[0]++; | |
3390 | } | |
71267333 | 3391 | btrfs_release_path(path); |
3b080b25 | 3392 | skip: |
a2de733c AJ |
3393 | logical += increment; |
3394 | physical += map->stripe_len; | |
d9d181c1 | 3395 | spin_lock(&sctx->stat_lock); |
625f1c8d LB |
3396 | if (stop_loop) |
3397 | sctx->stat.last_physical = map->stripes[num].physical + | |
3398 | length; | |
3399 | else | |
3400 | sctx->stat.last_physical = physical; | |
d9d181c1 | 3401 | spin_unlock(&sctx->stat_lock); |
625f1c8d LB |
3402 | if (stop_loop) |
3403 | break; | |
a2de733c | 3404 | } |
ff023aac | 3405 | out: |
a2de733c | 3406 | /* push queued extents */ |
d9d181c1 | 3407 | scrub_submit(sctx); |
3fb99303 | 3408 | mutex_lock(&sctx->wr_lock); |
ff023aac | 3409 | scrub_wr_submit(sctx); |
3fb99303 | 3410 | mutex_unlock(&sctx->wr_lock); |
a2de733c | 3411 | |
e7786c3a | 3412 | blk_finish_plug(&plug); |
a2de733c | 3413 | btrfs_free_path(path); |
5a6ac9ea | 3414 | btrfs_free_path(ppath); |
a2de733c AJ |
3415 | return ret < 0 ? ret : 0; |
3416 | } | |
3417 | ||
d9d181c1 | 3418 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
a36cf8b8 | 3419 | struct btrfs_device *scrub_dev, |
a36cf8b8 | 3420 | u64 chunk_offset, u64 length, |
020d5b73 | 3421 | u64 dev_offset, |
32934280 | 3422 | struct btrfs_block_group_cache *cache) |
a2de733c | 3423 | { |
fb456252 | 3424 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
c8bf1b67 | 3425 | struct extent_map_tree *map_tree = &fs_info->mapping_tree; |
a2de733c AJ |
3426 | struct map_lookup *map; |
3427 | struct extent_map *em; | |
3428 | int i; | |
ff023aac | 3429 | int ret = 0; |
a2de733c | 3430 | |
c8bf1b67 DS |
3431 | read_lock(&map_tree->lock); |
3432 | em = lookup_extent_mapping(map_tree, chunk_offset, 1); | |
3433 | read_unlock(&map_tree->lock); | |
a2de733c | 3434 | |
020d5b73 FM |
3435 | if (!em) { |
3436 | /* | |
3437 | * Might have been an unused block group deleted by the cleaner | |
3438 | * kthread or relocation. | |
3439 | */ | |
3440 | spin_lock(&cache->lock); | |
3441 | if (!cache->removed) | |
3442 | ret = -EINVAL; | |
3443 | spin_unlock(&cache->lock); | |
3444 | ||
3445 | return ret; | |
3446 | } | |
a2de733c | 3447 | |
95617d69 | 3448 | map = em->map_lookup; |
a2de733c AJ |
3449 | if (em->start != chunk_offset) |
3450 | goto out; | |
3451 | ||
3452 | if (em->len < length) | |
3453 | goto out; | |
3454 | ||
3455 | for (i = 0; i < map->num_stripes; ++i) { | |
a36cf8b8 | 3456 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
859acaf1 | 3457 | map->stripes[i].physical == dev_offset) { |
a36cf8b8 | 3458 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
32934280 | 3459 | chunk_offset, length); |
a2de733c AJ |
3460 | if (ret) |
3461 | goto out; | |
3462 | } | |
3463 | } | |
3464 | out: | |
3465 | free_extent_map(em); | |
3466 | ||
3467 | return ret; | |
3468 | } | |
3469 | ||
3470 | static noinline_for_stack | |
a36cf8b8 | 3471 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
32934280 | 3472 | struct btrfs_device *scrub_dev, u64 start, u64 end) |
a2de733c AJ |
3473 | { |
3474 | struct btrfs_dev_extent *dev_extent = NULL; | |
3475 | struct btrfs_path *path; | |
0b246afa JM |
3476 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
3477 | struct btrfs_root *root = fs_info->dev_root; | |
a2de733c | 3478 | u64 length; |
a2de733c | 3479 | u64 chunk_offset; |
55e3a601 | 3480 | int ret = 0; |
76a8efa1 | 3481 | int ro_set; |
a2de733c AJ |
3482 | int slot; |
3483 | struct extent_buffer *l; | |
3484 | struct btrfs_key key; | |
3485 | struct btrfs_key found_key; | |
3486 | struct btrfs_block_group_cache *cache; | |
ff023aac | 3487 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
a2de733c AJ |
3488 | |
3489 | path = btrfs_alloc_path(); | |
3490 | if (!path) | |
3491 | return -ENOMEM; | |
3492 | ||
e4058b54 | 3493 | path->reada = READA_FORWARD; |
a2de733c AJ |
3494 | path->search_commit_root = 1; |
3495 | path->skip_locking = 1; | |
3496 | ||
a36cf8b8 | 3497 | key.objectid = scrub_dev->devid; |
a2de733c AJ |
3498 | key.offset = 0ull; |
3499 | key.type = BTRFS_DEV_EXTENT_KEY; | |
3500 | ||
a2de733c AJ |
3501 | while (1) { |
3502 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3503 | if (ret < 0) | |
8c51032f AJ |
3504 | break; |
3505 | if (ret > 0) { | |
3506 | if (path->slots[0] >= | |
3507 | btrfs_header_nritems(path->nodes[0])) { | |
3508 | ret = btrfs_next_leaf(root, path); | |
55e3a601 Z |
3509 | if (ret < 0) |
3510 | break; | |
3511 | if (ret > 0) { | |
3512 | ret = 0; | |
8c51032f | 3513 | break; |
55e3a601 Z |
3514 | } |
3515 | } else { | |
3516 | ret = 0; | |
8c51032f AJ |
3517 | } |
3518 | } | |
a2de733c AJ |
3519 | |
3520 | l = path->nodes[0]; | |
3521 | slot = path->slots[0]; | |
3522 | ||
3523 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
3524 | ||
a36cf8b8 | 3525 | if (found_key.objectid != scrub_dev->devid) |
a2de733c AJ |
3526 | break; |
3527 | ||
962a298f | 3528 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) |
a2de733c AJ |
3529 | break; |
3530 | ||
3531 | if (found_key.offset >= end) | |
3532 | break; | |
3533 | ||
3534 | if (found_key.offset < key.offset) | |
3535 | break; | |
3536 | ||
3537 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
3538 | length = btrfs_dev_extent_length(l, dev_extent); | |
3539 | ||
ced96edc QW |
3540 | if (found_key.offset + length <= start) |
3541 | goto skip; | |
a2de733c | 3542 | |
a2de733c AJ |
3543 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); |
3544 | ||
3545 | /* | |
3546 | * get a reference on the corresponding block group to prevent | |
3547 | * the chunk from going away while we scrub it | |
3548 | */ | |
3549 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
ced96edc QW |
3550 | |
3551 | /* some chunks are removed but not committed to disk yet, | |
3552 | * continue scrubbing */ | |
3553 | if (!cache) | |
3554 | goto skip; | |
3555 | ||
55e3a601 Z |
3556 | /* |
3557 | * we need call btrfs_inc_block_group_ro() with scrubs_paused, | |
3558 | * to avoid deadlock caused by: | |
3559 | * btrfs_inc_block_group_ro() | |
3560 | * -> btrfs_wait_for_commit() | |
3561 | * -> btrfs_commit_transaction() | |
3562 | * -> btrfs_scrub_pause() | |
3563 | */ | |
3564 | scrub_pause_on(fs_info); | |
c83488af | 3565 | ret = btrfs_inc_block_group_ro(cache); |
32934280 | 3566 | if (!ret && sctx->is_dev_replace) { |
f0e9b7d6 FM |
3567 | /* |
3568 | * If we are doing a device replace wait for any tasks | |
52042d8e | 3569 | * that started delalloc right before we set the block |
f0e9b7d6 FM |
3570 | * group to RO mode, as they might have just allocated |
3571 | * an extent from it or decided they could do a nocow | |
3572 | * write. And if any such tasks did that, wait for their | |
3573 | * ordered extents to complete and then commit the | |
3574 | * current transaction, so that we can later see the new | |
3575 | * extent items in the extent tree - the ordered extents | |
3576 | * create delayed data references (for cow writes) when | |
3577 | * they complete, which will be run and insert the | |
3578 | * corresponding extent items into the extent tree when | |
3579 | * we commit the transaction they used when running | |
3580 | * inode.c:btrfs_finish_ordered_io(). We later use | |
3581 | * the commit root of the extent tree to find extents | |
3582 | * to copy from the srcdev into the tgtdev, and we don't | |
3583 | * want to miss any new extents. | |
3584 | */ | |
3585 | btrfs_wait_block_group_reservations(cache); | |
3586 | btrfs_wait_nocow_writers(cache); | |
6374e57a | 3587 | ret = btrfs_wait_ordered_roots(fs_info, U64_MAX, |
f0e9b7d6 FM |
3588 | cache->key.objectid, |
3589 | cache->key.offset); | |
3590 | if (ret > 0) { | |
3591 | struct btrfs_trans_handle *trans; | |
3592 | ||
3593 | trans = btrfs_join_transaction(root); | |
3594 | if (IS_ERR(trans)) | |
3595 | ret = PTR_ERR(trans); | |
3596 | else | |
3a45bb20 | 3597 | ret = btrfs_commit_transaction(trans); |
f0e9b7d6 FM |
3598 | if (ret) { |
3599 | scrub_pause_off(fs_info); | |
3600 | btrfs_put_block_group(cache); | |
3601 | break; | |
3602 | } | |
3603 | } | |
3604 | } | |
55e3a601 | 3605 | scrub_pause_off(fs_info); |
76a8efa1 Z |
3606 | |
3607 | if (ret == 0) { | |
3608 | ro_set = 1; | |
3609 | } else if (ret == -ENOSPC) { | |
3610 | /* | |
3611 | * btrfs_inc_block_group_ro return -ENOSPC when it | |
3612 | * failed in creating new chunk for metadata. | |
3613 | * It is not a problem for scrub/replace, because | |
3614 | * metadata are always cowed, and our scrub paused | |
3615 | * commit_transactions. | |
3616 | */ | |
3617 | ro_set = 0; | |
3618 | } else { | |
5d163e0e | 3619 | btrfs_warn(fs_info, |
913e1535 | 3620 | "failed setting block group ro: %d", ret); |
55e3a601 Z |
3621 | btrfs_put_block_group(cache); |
3622 | break; | |
3623 | } | |
3624 | ||
cb5583dd | 3625 | down_write(&fs_info->dev_replace.rwsem); |
ff023aac SB |
3626 | dev_replace->cursor_right = found_key.offset + length; |
3627 | dev_replace->cursor_left = found_key.offset; | |
3628 | dev_replace->item_needs_writeback = 1; | |
cb5583dd DS |
3629 | up_write(&dev_replace->rwsem); |
3630 | ||
8c204c96 | 3631 | ret = scrub_chunk(sctx, scrub_dev, chunk_offset, length, |
32934280 | 3632 | found_key.offset, cache); |
ff023aac SB |
3633 | |
3634 | /* | |
3635 | * flush, submit all pending read and write bios, afterwards | |
3636 | * wait for them. | |
3637 | * Note that in the dev replace case, a read request causes | |
3638 | * write requests that are submitted in the read completion | |
3639 | * worker. Therefore in the current situation, it is required | |
3640 | * that all write requests are flushed, so that all read and | |
3641 | * write requests are really completed when bios_in_flight | |
3642 | * changes to 0. | |
3643 | */ | |
2073c4c2 | 3644 | sctx->flush_all_writes = true; |
ff023aac | 3645 | scrub_submit(sctx); |
3fb99303 | 3646 | mutex_lock(&sctx->wr_lock); |
ff023aac | 3647 | scrub_wr_submit(sctx); |
3fb99303 | 3648 | mutex_unlock(&sctx->wr_lock); |
ff023aac SB |
3649 | |
3650 | wait_event(sctx->list_wait, | |
3651 | atomic_read(&sctx->bios_in_flight) == 0); | |
b708ce96 Z |
3652 | |
3653 | scrub_pause_on(fs_info); | |
12cf9372 WS |
3654 | |
3655 | /* | |
3656 | * must be called before we decrease @scrub_paused. | |
3657 | * make sure we don't block transaction commit while | |
3658 | * we are waiting pending workers finished. | |
3659 | */ | |
ff023aac SB |
3660 | wait_event(sctx->list_wait, |
3661 | atomic_read(&sctx->workers_pending) == 0); | |
2073c4c2 | 3662 | sctx->flush_all_writes = false; |
12cf9372 | 3663 | |
b708ce96 | 3664 | scrub_pause_off(fs_info); |
ff023aac | 3665 | |
cb5583dd | 3666 | down_write(&fs_info->dev_replace.rwsem); |
1a1a8b73 FM |
3667 | dev_replace->cursor_left = dev_replace->cursor_right; |
3668 | dev_replace->item_needs_writeback = 1; | |
cb5583dd | 3669 | up_write(&fs_info->dev_replace.rwsem); |
1a1a8b73 | 3670 | |
76a8efa1 | 3671 | if (ro_set) |
2ff7e61e | 3672 | btrfs_dec_block_group_ro(cache); |
ff023aac | 3673 | |
758f2dfc FM |
3674 | /* |
3675 | * We might have prevented the cleaner kthread from deleting | |
3676 | * this block group if it was already unused because we raced | |
3677 | * and set it to RO mode first. So add it back to the unused | |
3678 | * list, otherwise it might not ever be deleted unless a manual | |
3679 | * balance is triggered or it becomes used and unused again. | |
3680 | */ | |
3681 | spin_lock(&cache->lock); | |
3682 | if (!cache->removed && !cache->ro && cache->reserved == 0 && | |
3683 | btrfs_block_group_used(&cache->item) == 0) { | |
3684 | spin_unlock(&cache->lock); | |
031f24da | 3685 | btrfs_mark_bg_unused(cache); |
758f2dfc FM |
3686 | } else { |
3687 | spin_unlock(&cache->lock); | |
3688 | } | |
3689 | ||
a2de733c AJ |
3690 | btrfs_put_block_group(cache); |
3691 | if (ret) | |
3692 | break; | |
32934280 | 3693 | if (sctx->is_dev_replace && |
af1be4f8 | 3694 | atomic64_read(&dev_replace->num_write_errors) > 0) { |
ff023aac SB |
3695 | ret = -EIO; |
3696 | break; | |
3697 | } | |
3698 | if (sctx->stat.malloc_errors > 0) { | |
3699 | ret = -ENOMEM; | |
3700 | break; | |
3701 | } | |
ced96edc | 3702 | skip: |
a2de733c | 3703 | key.offset = found_key.offset + length; |
71267333 | 3704 | btrfs_release_path(path); |
a2de733c AJ |
3705 | } |
3706 | ||
a2de733c | 3707 | btrfs_free_path(path); |
8c51032f | 3708 | |
55e3a601 | 3709 | return ret; |
a2de733c AJ |
3710 | } |
3711 | ||
a36cf8b8 SB |
3712 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
3713 | struct btrfs_device *scrub_dev) | |
a2de733c AJ |
3714 | { |
3715 | int i; | |
3716 | u64 bytenr; | |
3717 | u64 gen; | |
3718 | int ret; | |
0b246afa | 3719 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
a2de733c | 3720 | |
0b246afa | 3721 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) |
79787eaa JM |
3722 | return -EIO; |
3723 | ||
5f546063 | 3724 | /* Seed devices of a new filesystem has their own generation. */ |
0b246afa | 3725 | if (scrub_dev->fs_devices != fs_info->fs_devices) |
5f546063 MX |
3726 | gen = scrub_dev->generation; |
3727 | else | |
0b246afa | 3728 | gen = fs_info->last_trans_committed; |
a2de733c AJ |
3729 | |
3730 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
3731 | bytenr = btrfs_sb_offset(i); | |
935e5cc9 MX |
3732 | if (bytenr + BTRFS_SUPER_INFO_SIZE > |
3733 | scrub_dev->commit_total_bytes) | |
a2de733c AJ |
3734 | break; |
3735 | ||
d9d181c1 | 3736 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
a36cf8b8 | 3737 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
ff023aac | 3738 | NULL, 1, bytenr); |
a2de733c AJ |
3739 | if (ret) |
3740 | return ret; | |
3741 | } | |
b6bfebc1 | 3742 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3743 | |
3744 | return 0; | |
3745 | } | |
3746 | ||
3747 | /* | |
3748 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
3749 | */ | |
ff023aac SB |
3750 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
3751 | int is_dev_replace) | |
a2de733c | 3752 | { |
6f011058 | 3753 | unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND; |
0339ef2f | 3754 | int max_active = fs_info->thread_pool_size; |
a2de733c | 3755 | |
eb4318e5 AJ |
3756 | lockdep_assert_held(&fs_info->scrub_lock); |
3757 | ||
ff09c4ca | 3758 | if (refcount_read(&fs_info->scrub_workers_refcnt) == 0) { |
c8352942 | 3759 | ASSERT(fs_info->scrub_workers == NULL); |
af1cbe0a DS |
3760 | fs_info->scrub_workers = btrfs_alloc_workqueue(fs_info, "scrub", |
3761 | flags, is_dev_replace ? 1 : max_active, 4); | |
e82afc52 ZL |
3762 | if (!fs_info->scrub_workers) |
3763 | goto fail_scrub_workers; | |
3764 | ||
c8352942 | 3765 | ASSERT(fs_info->scrub_wr_completion_workers == NULL); |
0339ef2f | 3766 | fs_info->scrub_wr_completion_workers = |
cb001095 | 3767 | btrfs_alloc_workqueue(fs_info, "scrubwrc", flags, |
0339ef2f | 3768 | max_active, 2); |
e82afc52 ZL |
3769 | if (!fs_info->scrub_wr_completion_workers) |
3770 | goto fail_scrub_wr_completion_workers; | |
3771 | ||
c8352942 | 3772 | ASSERT(fs_info->scrub_parity_workers == NULL); |
20b2e302 | 3773 | fs_info->scrub_parity_workers = |
cb001095 | 3774 | btrfs_alloc_workqueue(fs_info, "scrubparity", flags, |
20b2e302 | 3775 | max_active, 2); |
e82afc52 ZL |
3776 | if (!fs_info->scrub_parity_workers) |
3777 | goto fail_scrub_parity_workers; | |
ff09c4ca AJ |
3778 | |
3779 | refcount_set(&fs_info->scrub_workers_refcnt, 1); | |
3780 | } else { | |
3781 | refcount_inc(&fs_info->scrub_workers_refcnt); | |
632dd772 | 3782 | } |
e82afc52 ZL |
3783 | return 0; |
3784 | ||
3785 | fail_scrub_parity_workers: | |
e82afc52 ZL |
3786 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); |
3787 | fail_scrub_wr_completion_workers: | |
3788 | btrfs_destroy_workqueue(fs_info->scrub_workers); | |
3789 | fail_scrub_workers: | |
3790 | return -ENOMEM; | |
a2de733c AJ |
3791 | } |
3792 | ||
aa1b8cd4 SB |
3793 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
3794 | u64 end, struct btrfs_scrub_progress *progress, | |
63a212ab | 3795 | int readonly, int is_dev_replace) |
a2de733c | 3796 | { |
d9d181c1 | 3797 | struct scrub_ctx *sctx; |
a2de733c AJ |
3798 | int ret; |
3799 | struct btrfs_device *dev; | |
a5fb1142 | 3800 | unsigned int nofs_flag; |
1cec3f27 AJ |
3801 | struct btrfs_workqueue *scrub_workers = NULL; |
3802 | struct btrfs_workqueue *scrub_wr_comp = NULL; | |
3803 | struct btrfs_workqueue *scrub_parity = NULL; | |
a2de733c | 3804 | |
aa1b8cd4 | 3805 | if (btrfs_fs_closing(fs_info)) |
6c3abeda | 3806 | return -EAGAIN; |
a2de733c | 3807 | |
da17066c | 3808 | if (fs_info->nodesize > BTRFS_STRIPE_LEN) { |
b5d67f64 SB |
3809 | /* |
3810 | * in this case scrub is unable to calculate the checksum | |
3811 | * the way scrub is implemented. Do not handle this | |
3812 | * situation at all because it won't ever happen. | |
3813 | */ | |
efe120a0 FH |
3814 | btrfs_err(fs_info, |
3815 | "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails", | |
da17066c JM |
3816 | fs_info->nodesize, |
3817 | BTRFS_STRIPE_LEN); | |
b5d67f64 SB |
3818 | return -EINVAL; |
3819 | } | |
3820 | ||
da17066c | 3821 | if (fs_info->sectorsize != PAGE_SIZE) { |
b5d67f64 | 3822 | /* not supported for data w/o checksums */ |
751bebbe | 3823 | btrfs_err_rl(fs_info, |
5d163e0e | 3824 | "scrub: size assumption sectorsize != PAGE_SIZE (%d != %lu) fails", |
da17066c | 3825 | fs_info->sectorsize, PAGE_SIZE); |
a2de733c AJ |
3826 | return -EINVAL; |
3827 | } | |
3828 | ||
da17066c | 3829 | if (fs_info->nodesize > |
7a9e9987 | 3830 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || |
da17066c | 3831 | fs_info->sectorsize > PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { |
7a9e9987 SB |
3832 | /* |
3833 | * would exhaust the array bounds of pagev member in | |
3834 | * struct scrub_block | |
3835 | */ | |
5d163e0e JM |
3836 | btrfs_err(fs_info, |
3837 | "scrub: size assumption nodesize and sectorsize <= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails", | |
da17066c | 3838 | fs_info->nodesize, |
7a9e9987 | 3839 | SCRUB_MAX_PAGES_PER_BLOCK, |
da17066c | 3840 | fs_info->sectorsize, |
7a9e9987 SB |
3841 | SCRUB_MAX_PAGES_PER_BLOCK); |
3842 | return -EINVAL; | |
3843 | } | |
3844 | ||
0e94c4f4 DS |
3845 | /* Allocate outside of device_list_mutex */ |
3846 | sctx = scrub_setup_ctx(fs_info, is_dev_replace); | |
3847 | if (IS_ERR(sctx)) | |
3848 | return PTR_ERR(sctx); | |
a2de733c | 3849 | |
aa1b8cd4 | 3850 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
09ba3bc9 | 3851 | dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true); |
e6e674bd AJ |
3852 | if (!dev || (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state) && |
3853 | !is_dev_replace)) { | |
aa1b8cd4 | 3854 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
0e94c4f4 DS |
3855 | ret = -ENODEV; |
3856 | goto out_free_ctx; | |
a2de733c | 3857 | } |
a2de733c | 3858 | |
ebbede42 AJ |
3859 | if (!is_dev_replace && !readonly && |
3860 | !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state)) { | |
5d68da3b | 3861 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
672d5990 MT |
3862 | btrfs_err_in_rcu(fs_info, "scrub: device %s is not writable", |
3863 | rcu_str_deref(dev->name)); | |
0e94c4f4 DS |
3864 | ret = -EROFS; |
3865 | goto out_free_ctx; | |
5d68da3b MX |
3866 | } |
3867 | ||
3b7a016f | 3868 | mutex_lock(&fs_info->scrub_lock); |
e12c9621 | 3869 | if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) || |
401e29c1 | 3870 | test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &dev->dev_state)) { |
a2de733c | 3871 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3872 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
0e94c4f4 DS |
3873 | ret = -EIO; |
3874 | goto out_free_ctx; | |
a2de733c AJ |
3875 | } |
3876 | ||
cb5583dd | 3877 | down_read(&fs_info->dev_replace.rwsem); |
cadbc0a0 | 3878 | if (dev->scrub_ctx || |
8dabb742 SB |
3879 | (!is_dev_replace && |
3880 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { | |
cb5583dd | 3881 | up_read(&fs_info->dev_replace.rwsem); |
a2de733c | 3882 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3883 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
0e94c4f4 DS |
3884 | ret = -EINPROGRESS; |
3885 | goto out_free_ctx; | |
a2de733c | 3886 | } |
cb5583dd | 3887 | up_read(&fs_info->dev_replace.rwsem); |
3b7a016f WS |
3888 | |
3889 | ret = scrub_workers_get(fs_info, is_dev_replace); | |
3890 | if (ret) { | |
3891 | mutex_unlock(&fs_info->scrub_lock); | |
3892 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
0e94c4f4 | 3893 | goto out_free_ctx; |
3b7a016f WS |
3894 | } |
3895 | ||
d9d181c1 | 3896 | sctx->readonly = readonly; |
cadbc0a0 | 3897 | dev->scrub_ctx = sctx; |
3cb0929a | 3898 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 3899 | |
3cb0929a WS |
3900 | /* |
3901 | * checking @scrub_pause_req here, we can avoid | |
3902 | * race between committing transaction and scrubbing. | |
3903 | */ | |
cb7ab021 | 3904 | __scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3905 | atomic_inc(&fs_info->scrubs_running); |
3906 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c | 3907 | |
a5fb1142 FM |
3908 | /* |
3909 | * In order to avoid deadlock with reclaim when there is a transaction | |
3910 | * trying to pause scrub, make sure we use GFP_NOFS for all the | |
3911 | * allocations done at btrfs_scrub_pages() and scrub_pages_for_parity() | |
3912 | * invoked by our callees. The pausing request is done when the | |
3913 | * transaction commit starts, and it blocks the transaction until scrub | |
3914 | * is paused (done at specific points at scrub_stripe() or right above | |
3915 | * before incrementing fs_info->scrubs_running). | |
3916 | */ | |
3917 | nofs_flag = memalloc_nofs_save(); | |
ff023aac | 3918 | if (!is_dev_replace) { |
d1e14420 | 3919 | btrfs_info(fs_info, "scrub: started on devid %llu", devid); |
9b011adf WS |
3920 | /* |
3921 | * by holding device list mutex, we can | |
3922 | * kick off writing super in log tree sync. | |
3923 | */ | |
3cb0929a | 3924 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3925 | ret = scrub_supers(sctx, dev); |
3cb0929a | 3926 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3927 | } |
a2de733c AJ |
3928 | |
3929 | if (!ret) | |
32934280 | 3930 | ret = scrub_enumerate_chunks(sctx, dev, start, end); |
a5fb1142 | 3931 | memalloc_nofs_restore(nofs_flag); |
a2de733c | 3932 | |
b6bfebc1 | 3933 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3934 | atomic_dec(&fs_info->scrubs_running); |
3935 | wake_up(&fs_info->scrub_pause_wait); | |
3936 | ||
b6bfebc1 | 3937 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
0ef8e451 | 3938 | |
a2de733c | 3939 | if (progress) |
d9d181c1 | 3940 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
a2de733c | 3941 | |
d1e14420 AJ |
3942 | if (!is_dev_replace) |
3943 | btrfs_info(fs_info, "scrub: %s on devid %llu with status: %d", | |
3944 | ret ? "not finished" : "finished", devid, ret); | |
3945 | ||
a2de733c | 3946 | mutex_lock(&fs_info->scrub_lock); |
cadbc0a0 | 3947 | dev->scrub_ctx = NULL; |
ff09c4ca | 3948 | if (refcount_dec_and_test(&fs_info->scrub_workers_refcnt)) { |
1cec3f27 AJ |
3949 | scrub_workers = fs_info->scrub_workers; |
3950 | scrub_wr_comp = fs_info->scrub_wr_completion_workers; | |
3951 | scrub_parity = fs_info->scrub_parity_workers; | |
c8352942 DS |
3952 | |
3953 | fs_info->scrub_workers = NULL; | |
3954 | fs_info->scrub_wr_completion_workers = NULL; | |
3955 | fs_info->scrub_parity_workers = NULL; | |
1cec3f27 | 3956 | } |
a2de733c AJ |
3957 | mutex_unlock(&fs_info->scrub_lock); |
3958 | ||
1cec3f27 AJ |
3959 | btrfs_destroy_workqueue(scrub_workers); |
3960 | btrfs_destroy_workqueue(scrub_wr_comp); | |
3961 | btrfs_destroy_workqueue(scrub_parity); | |
f55985f4 | 3962 | scrub_put_ctx(sctx); |
a2de733c | 3963 | |
0e94c4f4 DS |
3964 | return ret; |
3965 | ||
3966 | out_free_ctx: | |
3967 | scrub_free_ctx(sctx); | |
3968 | ||
a2de733c AJ |
3969 | return ret; |
3970 | } | |
3971 | ||
2ff7e61e | 3972 | void btrfs_scrub_pause(struct btrfs_fs_info *fs_info) |
a2de733c | 3973 | { |
a2de733c AJ |
3974 | mutex_lock(&fs_info->scrub_lock); |
3975 | atomic_inc(&fs_info->scrub_pause_req); | |
3976 | while (atomic_read(&fs_info->scrubs_paused) != | |
3977 | atomic_read(&fs_info->scrubs_running)) { | |
3978 | mutex_unlock(&fs_info->scrub_lock); | |
3979 | wait_event(fs_info->scrub_pause_wait, | |
3980 | atomic_read(&fs_info->scrubs_paused) == | |
3981 | atomic_read(&fs_info->scrubs_running)); | |
3982 | mutex_lock(&fs_info->scrub_lock); | |
3983 | } | |
3984 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c AJ |
3985 | } |
3986 | ||
2ff7e61e | 3987 | void btrfs_scrub_continue(struct btrfs_fs_info *fs_info) |
a2de733c | 3988 | { |
a2de733c AJ |
3989 | atomic_dec(&fs_info->scrub_pause_req); |
3990 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
3991 | } |
3992 | ||
aa1b8cd4 | 3993 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
a2de733c | 3994 | { |
a2de733c AJ |
3995 | mutex_lock(&fs_info->scrub_lock); |
3996 | if (!atomic_read(&fs_info->scrubs_running)) { | |
3997 | mutex_unlock(&fs_info->scrub_lock); | |
3998 | return -ENOTCONN; | |
3999 | } | |
4000 | ||
4001 | atomic_inc(&fs_info->scrub_cancel_req); | |
4002 | while (atomic_read(&fs_info->scrubs_running)) { | |
4003 | mutex_unlock(&fs_info->scrub_lock); | |
4004 | wait_event(fs_info->scrub_pause_wait, | |
4005 | atomic_read(&fs_info->scrubs_running) == 0); | |
4006 | mutex_lock(&fs_info->scrub_lock); | |
4007 | } | |
4008 | atomic_dec(&fs_info->scrub_cancel_req); | |
4009 | mutex_unlock(&fs_info->scrub_lock); | |
4010 | ||
4011 | return 0; | |
4012 | } | |
4013 | ||
163e97ee | 4014 | int btrfs_scrub_cancel_dev(struct btrfs_device *dev) |
49b25e05 | 4015 | { |
163e97ee | 4016 | struct btrfs_fs_info *fs_info = dev->fs_info; |
d9d181c1 | 4017 | struct scrub_ctx *sctx; |
a2de733c AJ |
4018 | |
4019 | mutex_lock(&fs_info->scrub_lock); | |
cadbc0a0 | 4020 | sctx = dev->scrub_ctx; |
d9d181c1 | 4021 | if (!sctx) { |
a2de733c AJ |
4022 | mutex_unlock(&fs_info->scrub_lock); |
4023 | return -ENOTCONN; | |
4024 | } | |
d9d181c1 | 4025 | atomic_inc(&sctx->cancel_req); |
cadbc0a0 | 4026 | while (dev->scrub_ctx) { |
a2de733c AJ |
4027 | mutex_unlock(&fs_info->scrub_lock); |
4028 | wait_event(fs_info->scrub_pause_wait, | |
cadbc0a0 | 4029 | dev->scrub_ctx == NULL); |
a2de733c AJ |
4030 | mutex_lock(&fs_info->scrub_lock); |
4031 | } | |
4032 | mutex_unlock(&fs_info->scrub_lock); | |
4033 | ||
4034 | return 0; | |
4035 | } | |
1623edeb | 4036 | |
2ff7e61e | 4037 | int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid, |
a2de733c AJ |
4038 | struct btrfs_scrub_progress *progress) |
4039 | { | |
4040 | struct btrfs_device *dev; | |
d9d181c1 | 4041 | struct scrub_ctx *sctx = NULL; |
a2de733c | 4042 | |
0b246afa | 4043 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
09ba3bc9 | 4044 | dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true); |
a2de733c | 4045 | if (dev) |
cadbc0a0 | 4046 | sctx = dev->scrub_ctx; |
d9d181c1 SB |
4047 | if (sctx) |
4048 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
0b246afa | 4049 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 4050 | |
d9d181c1 | 4051 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
a2de733c | 4052 | } |
ff023aac SB |
4053 | |
4054 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
4055 | u64 extent_logical, u64 extent_len, | |
4056 | u64 *extent_physical, | |
4057 | struct btrfs_device **extent_dev, | |
4058 | int *extent_mirror_num) | |
4059 | { | |
4060 | u64 mapped_length; | |
4061 | struct btrfs_bio *bbio = NULL; | |
4062 | int ret; | |
4063 | ||
4064 | mapped_length = extent_len; | |
cf8cddd3 | 4065 | ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, extent_logical, |
ff023aac SB |
4066 | &mapped_length, &bbio, 0); |
4067 | if (ret || !bbio || mapped_length < extent_len || | |
4068 | !bbio->stripes[0].dev->bdev) { | |
6e9606d2 | 4069 | btrfs_put_bbio(bbio); |
ff023aac SB |
4070 | return; |
4071 | } | |
4072 | ||
4073 | *extent_physical = bbio->stripes[0].physical; | |
4074 | *extent_mirror_num = bbio->mirror_num; | |
4075 | *extent_dev = bbio->stripes[0].dev; | |
6e9606d2 | 4076 | btrfs_put_bbio(bbio); |
ff023aac | 4077 | } |