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> |
a2de733c AJ |
9 | #include "ctree.h" |
10 | #include "volumes.h" | |
11 | #include "disk-io.h" | |
12 | #include "ordered-data.h" | |
0ef8e451 | 13 | #include "transaction.h" |
558540c1 | 14 | #include "backref.h" |
5da6fcbc | 15 | #include "extent_io.h" |
ff023aac | 16 | #include "dev-replace.h" |
21adbd5c | 17 | #include "check-integrity.h" |
606686ee | 18 | #include "rcu-string.h" |
53b381b3 | 19 | #include "raid56.h" |
a2de733c AJ |
20 | |
21 | /* | |
22 | * This is only the first step towards a full-features scrub. It reads all | |
23 | * extent and super block and verifies the checksums. In case a bad checksum | |
24 | * is found or the extent cannot be read, good data will be written back if | |
25 | * any can be found. | |
26 | * | |
27 | * Future enhancements: | |
a2de733c AJ |
28 | * - In case an unrepairable extent is encountered, track which files are |
29 | * affected and report them | |
a2de733c | 30 | * - track and record media errors, throw out bad devices |
a2de733c | 31 | * - add a mode to also read unallocated space |
a2de733c AJ |
32 | */ |
33 | ||
b5d67f64 | 34 | struct scrub_block; |
d9d181c1 | 35 | struct scrub_ctx; |
a2de733c | 36 | |
ff023aac SB |
37 | /* |
38 | * the following three values only influence the performance. | |
39 | * The last one configures the number of parallel and outstanding I/O | |
40 | * operations. The first two values configure an upper limit for the number | |
41 | * of (dynamically allocated) pages that are added to a bio. | |
42 | */ | |
43 | #define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */ | |
44 | #define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */ | |
45 | #define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */ | |
7a9e9987 SB |
46 | |
47 | /* | |
48 | * the following value times PAGE_SIZE needs to be large enough to match the | |
49 | * largest node/leaf/sector size that shall be supported. | |
50 | * Values larger than BTRFS_STRIPE_LEN are not supported. | |
51 | */ | |
b5d67f64 | 52 | #define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */ |
a2de733c | 53 | |
af8e2d1d | 54 | struct scrub_recover { |
6f615018 | 55 | refcount_t refs; |
af8e2d1d | 56 | struct btrfs_bio *bbio; |
af8e2d1d MX |
57 | u64 map_length; |
58 | }; | |
59 | ||
a2de733c | 60 | struct scrub_page { |
b5d67f64 SB |
61 | struct scrub_block *sblock; |
62 | struct page *page; | |
442a4f63 | 63 | struct btrfs_device *dev; |
5a6ac9ea | 64 | struct list_head list; |
a2de733c AJ |
65 | u64 flags; /* extent flags */ |
66 | u64 generation; | |
b5d67f64 SB |
67 | u64 logical; |
68 | u64 physical; | |
ff023aac | 69 | u64 physical_for_dev_replace; |
57019345 | 70 | atomic_t refs; |
b5d67f64 SB |
71 | struct { |
72 | unsigned int mirror_num:8; | |
73 | unsigned int have_csum:1; | |
74 | unsigned int io_error:1; | |
75 | }; | |
a2de733c | 76 | u8 csum[BTRFS_CSUM_SIZE]; |
af8e2d1d MX |
77 | |
78 | struct scrub_recover *recover; | |
a2de733c AJ |
79 | }; |
80 | ||
81 | struct scrub_bio { | |
82 | int index; | |
d9d181c1 | 83 | struct scrub_ctx *sctx; |
a36cf8b8 | 84 | struct btrfs_device *dev; |
a2de733c | 85 | struct bio *bio; |
4e4cbee9 | 86 | blk_status_t status; |
a2de733c AJ |
87 | u64 logical; |
88 | u64 physical; | |
ff023aac SB |
89 | #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO |
90 | struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO]; | |
91 | #else | |
92 | struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO]; | |
93 | #endif | |
b5d67f64 | 94 | int page_count; |
a2de733c AJ |
95 | int next_free; |
96 | struct btrfs_work work; | |
97 | }; | |
98 | ||
b5d67f64 | 99 | struct scrub_block { |
7a9e9987 | 100 | struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK]; |
b5d67f64 SB |
101 | int page_count; |
102 | atomic_t outstanding_pages; | |
186debd6 | 103 | refcount_t refs; /* free mem on transition to zero */ |
d9d181c1 | 104 | struct scrub_ctx *sctx; |
5a6ac9ea | 105 | struct scrub_parity *sparity; |
b5d67f64 SB |
106 | struct { |
107 | unsigned int header_error:1; | |
108 | unsigned int checksum_error:1; | |
109 | unsigned int no_io_error_seen:1; | |
442a4f63 | 110 | unsigned int generation_error:1; /* also sets header_error */ |
5a6ac9ea MX |
111 | |
112 | /* The following is for the data used to check parity */ | |
113 | /* It is for the data with checksum */ | |
114 | unsigned int data_corrected:1; | |
b5d67f64 | 115 | }; |
73ff61db | 116 | struct btrfs_work work; |
b5d67f64 SB |
117 | }; |
118 | ||
5a6ac9ea MX |
119 | /* Used for the chunks with parity stripe such RAID5/6 */ |
120 | struct scrub_parity { | |
121 | struct scrub_ctx *sctx; | |
122 | ||
123 | struct btrfs_device *scrub_dev; | |
124 | ||
125 | u64 logic_start; | |
126 | ||
127 | u64 logic_end; | |
128 | ||
129 | int nsectors; | |
130 | ||
972d7219 | 131 | u64 stripe_len; |
5a6ac9ea | 132 | |
78a76450 | 133 | refcount_t refs; |
5a6ac9ea MX |
134 | |
135 | struct list_head spages; | |
136 | ||
137 | /* Work of parity check and repair */ | |
138 | struct btrfs_work work; | |
139 | ||
140 | /* Mark the parity blocks which have data */ | |
141 | unsigned long *dbitmap; | |
142 | ||
143 | /* | |
144 | * Mark the parity blocks which have data, but errors happen when | |
145 | * read data or check data | |
146 | */ | |
147 | unsigned long *ebitmap; | |
148 | ||
149 | unsigned long bitmap[0]; | |
150 | }; | |
151 | ||
d9d181c1 | 152 | struct scrub_ctx { |
ff023aac | 153 | struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX]; |
fb456252 | 154 | struct btrfs_fs_info *fs_info; |
a2de733c AJ |
155 | int first_free; |
156 | int curr; | |
b6bfebc1 SB |
157 | atomic_t bios_in_flight; |
158 | atomic_t workers_pending; | |
a2de733c AJ |
159 | spinlock_t list_lock; |
160 | wait_queue_head_t list_wait; | |
161 | u16 csum_size; | |
162 | struct list_head csum_list; | |
163 | atomic_t cancel_req; | |
8628764e | 164 | int readonly; |
ff023aac | 165 | int pages_per_rd_bio; |
63a212ab SB |
166 | |
167 | int is_dev_replace; | |
3fb99303 DS |
168 | |
169 | struct scrub_bio *wr_curr_bio; | |
170 | struct mutex wr_lock; | |
171 | int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */ | |
3fb99303 | 172 | struct btrfs_device *wr_tgtdev; |
2073c4c2 | 173 | bool flush_all_writes; |
63a212ab | 174 | |
a2de733c AJ |
175 | /* |
176 | * statistics | |
177 | */ | |
178 | struct btrfs_scrub_progress stat; | |
179 | spinlock_t stat_lock; | |
f55985f4 FM |
180 | |
181 | /* | |
182 | * Use a ref counter to avoid use-after-free issues. Scrub workers | |
183 | * decrement bios_in_flight and workers_pending and then do a wakeup | |
184 | * on the list_wait wait queue. We must ensure the main scrub task | |
185 | * doesn't free the scrub context before or while the workers are | |
186 | * doing the wakeup() call. | |
187 | */ | |
99f4cdb1 | 188 | refcount_t refs; |
a2de733c AJ |
189 | }; |
190 | ||
558540c1 JS |
191 | struct scrub_warning { |
192 | struct btrfs_path *path; | |
193 | u64 extent_item_size; | |
558540c1 | 194 | const char *errstr; |
6aa21263 | 195 | u64 physical; |
558540c1 JS |
196 | u64 logical; |
197 | struct btrfs_device *dev; | |
558540c1 JS |
198 | }; |
199 | ||
0966a7b1 QW |
200 | struct full_stripe_lock { |
201 | struct rb_node node; | |
202 | u64 logical; | |
203 | u64 refs; | |
204 | struct mutex mutex; | |
205 | }; | |
206 | ||
b6bfebc1 SB |
207 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx); |
208 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx); | |
b5d67f64 | 209 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check); |
be50a8dd | 210 | static int scrub_setup_recheck_block(struct scrub_block *original_sblock, |
ff023aac | 211 | struct scrub_block *sblocks_for_recheck); |
34f5c8e9 | 212 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
affe4a5a ZL |
213 | struct scrub_block *sblock, |
214 | int retry_failed_mirror); | |
ba7cf988 | 215 | static void scrub_recheck_block_checksum(struct scrub_block *sblock); |
b5d67f64 | 216 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
114ab50d | 217 | struct scrub_block *sblock_good); |
b5d67f64 SB |
218 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, |
219 | struct scrub_block *sblock_good, | |
220 | int page_num, int force_write); | |
ff023aac SB |
221 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock); |
222 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
223 | int page_num); | |
b5d67f64 SB |
224 | static int scrub_checksum_data(struct scrub_block *sblock); |
225 | static int scrub_checksum_tree_block(struct scrub_block *sblock); | |
226 | static int scrub_checksum_super(struct scrub_block *sblock); | |
227 | static void scrub_block_get(struct scrub_block *sblock); | |
228 | static void scrub_block_put(struct scrub_block *sblock); | |
7a9e9987 SB |
229 | static void scrub_page_get(struct scrub_page *spage); |
230 | static void scrub_page_put(struct scrub_page *spage); | |
5a6ac9ea MX |
231 | static void scrub_parity_get(struct scrub_parity *sparity); |
232 | static void scrub_parity_put(struct scrub_parity *sparity); | |
ff023aac SB |
233 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
234 | struct scrub_page *spage); | |
d9d181c1 | 235 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 236 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
237 | u64 gen, int mirror_num, u8 *csum, int force, |
238 | u64 physical_for_dev_replace); | |
4246a0b6 | 239 | static void scrub_bio_end_io(struct bio *bio); |
b5d67f64 SB |
240 | static void scrub_bio_end_io_worker(struct btrfs_work *work); |
241 | static void scrub_block_complete(struct scrub_block *sblock); | |
ff023aac SB |
242 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, |
243 | u64 extent_logical, u64 extent_len, | |
244 | u64 *extent_physical, | |
245 | struct btrfs_device **extent_dev, | |
246 | int *extent_mirror_num); | |
ff023aac SB |
247 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, |
248 | struct scrub_page *spage); | |
249 | static void scrub_wr_submit(struct scrub_ctx *sctx); | |
4246a0b6 | 250 | static void scrub_wr_bio_end_io(struct bio *bio); |
ff023aac | 251 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work); |
cb7ab021 | 252 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
3cb0929a | 253 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
f55985f4 | 254 | static void scrub_put_ctx(struct scrub_ctx *sctx); |
1623edeb | 255 | |
762221f0 LB |
256 | static inline int scrub_is_page_on_raid56(struct scrub_page *page) |
257 | { | |
258 | return page->recover && | |
259 | (page->recover->bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK); | |
260 | } | |
1623edeb | 261 | |
b6bfebc1 SB |
262 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx) |
263 | { | |
99f4cdb1 | 264 | refcount_inc(&sctx->refs); |
b6bfebc1 SB |
265 | atomic_inc(&sctx->bios_in_flight); |
266 | } | |
267 | ||
268 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx) | |
269 | { | |
270 | atomic_dec(&sctx->bios_in_flight); | |
271 | wake_up(&sctx->list_wait); | |
f55985f4 | 272 | scrub_put_ctx(sctx); |
b6bfebc1 SB |
273 | } |
274 | ||
cb7ab021 | 275 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
3cb0929a WS |
276 | { |
277 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
278 | mutex_unlock(&fs_info->scrub_lock); | |
279 | wait_event(fs_info->scrub_pause_wait, | |
280 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
281 | mutex_lock(&fs_info->scrub_lock); | |
282 | } | |
283 | } | |
284 | ||
0e22be89 | 285 | static void scrub_pause_on(struct btrfs_fs_info *fs_info) |
cb7ab021 WS |
286 | { |
287 | atomic_inc(&fs_info->scrubs_paused); | |
288 | wake_up(&fs_info->scrub_pause_wait); | |
0e22be89 | 289 | } |
cb7ab021 | 290 | |
0e22be89 Z |
291 | static void scrub_pause_off(struct btrfs_fs_info *fs_info) |
292 | { | |
cb7ab021 WS |
293 | mutex_lock(&fs_info->scrub_lock); |
294 | __scrub_blocked_if_needed(fs_info); | |
295 | atomic_dec(&fs_info->scrubs_paused); | |
296 | mutex_unlock(&fs_info->scrub_lock); | |
297 | ||
298 | wake_up(&fs_info->scrub_pause_wait); | |
299 | } | |
300 | ||
0e22be89 Z |
301 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
302 | { | |
303 | scrub_pause_on(fs_info); | |
304 | scrub_pause_off(fs_info); | |
305 | } | |
306 | ||
0966a7b1 QW |
307 | /* |
308 | * Insert new full stripe lock into full stripe locks tree | |
309 | * | |
310 | * Return pointer to existing or newly inserted full_stripe_lock structure if | |
311 | * everything works well. | |
312 | * Return ERR_PTR(-ENOMEM) if we failed to allocate memory | |
313 | * | |
314 | * NOTE: caller must hold full_stripe_locks_root->lock before calling this | |
315 | * function | |
316 | */ | |
317 | static struct full_stripe_lock *insert_full_stripe_lock( | |
318 | struct btrfs_full_stripe_locks_tree *locks_root, | |
319 | u64 fstripe_logical) | |
320 | { | |
321 | struct rb_node **p; | |
322 | struct rb_node *parent = NULL; | |
323 | struct full_stripe_lock *entry; | |
324 | struct full_stripe_lock *ret; | |
325 | ||
a32bf9a3 | 326 | lockdep_assert_held(&locks_root->lock); |
0966a7b1 QW |
327 | |
328 | p = &locks_root->root.rb_node; | |
329 | while (*p) { | |
330 | parent = *p; | |
331 | entry = rb_entry(parent, struct full_stripe_lock, node); | |
332 | if (fstripe_logical < entry->logical) { | |
333 | p = &(*p)->rb_left; | |
334 | } else if (fstripe_logical > entry->logical) { | |
335 | p = &(*p)->rb_right; | |
336 | } else { | |
337 | entry->refs++; | |
338 | return entry; | |
339 | } | |
340 | } | |
341 | ||
a5fb1142 FM |
342 | /* |
343 | * Insert new lock. | |
a5fb1142 | 344 | */ |
0966a7b1 QW |
345 | ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
346 | if (!ret) | |
347 | return ERR_PTR(-ENOMEM); | |
348 | ret->logical = fstripe_logical; | |
349 | ret->refs = 1; | |
350 | mutex_init(&ret->mutex); | |
351 | ||
352 | rb_link_node(&ret->node, parent, p); | |
353 | rb_insert_color(&ret->node, &locks_root->root); | |
354 | return ret; | |
355 | } | |
356 | ||
357 | /* | |
358 | * Search for a full stripe lock of a block group | |
359 | * | |
360 | * Return pointer to existing full stripe lock if found | |
361 | * Return NULL if not found | |
362 | */ | |
363 | static struct full_stripe_lock *search_full_stripe_lock( | |
364 | struct btrfs_full_stripe_locks_tree *locks_root, | |
365 | u64 fstripe_logical) | |
366 | { | |
367 | struct rb_node *node; | |
368 | struct full_stripe_lock *entry; | |
369 | ||
a32bf9a3 | 370 | lockdep_assert_held(&locks_root->lock); |
0966a7b1 QW |
371 | |
372 | node = locks_root->root.rb_node; | |
373 | while (node) { | |
374 | entry = rb_entry(node, struct full_stripe_lock, node); | |
375 | if (fstripe_logical < entry->logical) | |
376 | node = node->rb_left; | |
377 | else if (fstripe_logical > entry->logical) | |
378 | node = node->rb_right; | |
379 | else | |
380 | return entry; | |
381 | } | |
382 | return NULL; | |
383 | } | |
384 | ||
385 | /* | |
386 | * Helper to get full stripe logical from a normal bytenr. | |
387 | * | |
388 | * Caller must ensure @cache is a RAID56 block group. | |
389 | */ | |
390 | static u64 get_full_stripe_logical(struct btrfs_block_group_cache *cache, | |
391 | u64 bytenr) | |
392 | { | |
393 | u64 ret; | |
394 | ||
395 | /* | |
396 | * Due to chunk item size limit, full stripe length should not be | |
397 | * larger than U32_MAX. Just a sanity check here. | |
398 | */ | |
399 | WARN_ON_ONCE(cache->full_stripe_len >= U32_MAX); | |
400 | ||
401 | /* | |
402 | * round_down() can only handle power of 2, while RAID56 full | |
403 | * stripe length can be 64KiB * n, so we need to manually round down. | |
404 | */ | |
405 | ret = div64_u64(bytenr - cache->key.objectid, cache->full_stripe_len) * | |
406 | cache->full_stripe_len + cache->key.objectid; | |
407 | return ret; | |
408 | } | |
409 | ||
410 | /* | |
411 | * Lock a full stripe to avoid concurrency of recovery and read | |
412 | * | |
413 | * It's only used for profiles with parities (RAID5/6), for other profiles it | |
414 | * does nothing. | |
415 | * | |
416 | * Return 0 if we locked full stripe covering @bytenr, with a mutex held. | |
417 | * So caller must call unlock_full_stripe() at the same context. | |
418 | * | |
419 | * Return <0 if encounters error. | |
420 | */ | |
421 | static int lock_full_stripe(struct btrfs_fs_info *fs_info, u64 bytenr, | |
422 | bool *locked_ret) | |
423 | { | |
424 | struct btrfs_block_group_cache *bg_cache; | |
425 | struct btrfs_full_stripe_locks_tree *locks_root; | |
426 | struct full_stripe_lock *existing; | |
427 | u64 fstripe_start; | |
428 | int ret = 0; | |
429 | ||
430 | *locked_ret = false; | |
431 | bg_cache = btrfs_lookup_block_group(fs_info, bytenr); | |
432 | if (!bg_cache) { | |
433 | ASSERT(0); | |
434 | return -ENOENT; | |
435 | } | |
436 | ||
437 | /* Profiles not based on parity don't need full stripe lock */ | |
438 | if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_RAID56_MASK)) | |
439 | goto out; | |
440 | locks_root = &bg_cache->full_stripe_locks_root; | |
441 | ||
442 | fstripe_start = get_full_stripe_logical(bg_cache, bytenr); | |
443 | ||
444 | /* Now insert the full stripe lock */ | |
445 | mutex_lock(&locks_root->lock); | |
446 | existing = insert_full_stripe_lock(locks_root, fstripe_start); | |
447 | mutex_unlock(&locks_root->lock); | |
448 | if (IS_ERR(existing)) { | |
449 | ret = PTR_ERR(existing); | |
450 | goto out; | |
451 | } | |
452 | mutex_lock(&existing->mutex); | |
453 | *locked_ret = true; | |
454 | out: | |
455 | btrfs_put_block_group(bg_cache); | |
456 | return ret; | |
457 | } | |
458 | ||
459 | /* | |
460 | * Unlock a full stripe. | |
461 | * | |
462 | * NOTE: Caller must ensure it's the same context calling corresponding | |
463 | * lock_full_stripe(). | |
464 | * | |
465 | * Return 0 if we unlock full stripe without problem. | |
466 | * Return <0 for error | |
467 | */ | |
468 | static int unlock_full_stripe(struct btrfs_fs_info *fs_info, u64 bytenr, | |
469 | bool locked) | |
470 | { | |
471 | struct btrfs_block_group_cache *bg_cache; | |
472 | struct btrfs_full_stripe_locks_tree *locks_root; | |
473 | struct full_stripe_lock *fstripe_lock; | |
474 | u64 fstripe_start; | |
475 | bool freeit = false; | |
476 | int ret = 0; | |
477 | ||
478 | /* If we didn't acquire full stripe lock, no need to continue */ | |
479 | if (!locked) | |
480 | return 0; | |
481 | ||
482 | bg_cache = btrfs_lookup_block_group(fs_info, bytenr); | |
483 | if (!bg_cache) { | |
484 | ASSERT(0); | |
485 | return -ENOENT; | |
486 | } | |
487 | if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_RAID56_MASK)) | |
488 | goto out; | |
489 | ||
490 | locks_root = &bg_cache->full_stripe_locks_root; | |
491 | fstripe_start = get_full_stripe_logical(bg_cache, bytenr); | |
492 | ||
493 | mutex_lock(&locks_root->lock); | |
494 | fstripe_lock = search_full_stripe_lock(locks_root, fstripe_start); | |
495 | /* Unpaired unlock_full_stripe() detected */ | |
496 | if (!fstripe_lock) { | |
497 | WARN_ON(1); | |
498 | ret = -ENOENT; | |
499 | mutex_unlock(&locks_root->lock); | |
500 | goto out; | |
501 | } | |
502 | ||
503 | if (fstripe_lock->refs == 0) { | |
504 | WARN_ON(1); | |
505 | btrfs_warn(fs_info, "full stripe lock at %llu refcount underflow", | |
506 | fstripe_lock->logical); | |
507 | } else { | |
508 | fstripe_lock->refs--; | |
509 | } | |
510 | ||
511 | if (fstripe_lock->refs == 0) { | |
512 | rb_erase(&fstripe_lock->node, &locks_root->root); | |
513 | freeit = true; | |
514 | } | |
515 | mutex_unlock(&locks_root->lock); | |
516 | ||
517 | mutex_unlock(&fstripe_lock->mutex); | |
518 | if (freeit) | |
519 | kfree(fstripe_lock); | |
520 | out: | |
521 | btrfs_put_block_group(bg_cache); | |
522 | return ret; | |
523 | } | |
524 | ||
d9d181c1 | 525 | static void scrub_free_csums(struct scrub_ctx *sctx) |
a2de733c | 526 | { |
d9d181c1 | 527 | while (!list_empty(&sctx->csum_list)) { |
a2de733c | 528 | struct btrfs_ordered_sum *sum; |
d9d181c1 | 529 | sum = list_first_entry(&sctx->csum_list, |
a2de733c AJ |
530 | struct btrfs_ordered_sum, list); |
531 | list_del(&sum->list); | |
532 | kfree(sum); | |
533 | } | |
534 | } | |
535 | ||
d9d181c1 | 536 | static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) |
a2de733c AJ |
537 | { |
538 | int i; | |
a2de733c | 539 | |
d9d181c1 | 540 | if (!sctx) |
a2de733c AJ |
541 | return; |
542 | ||
b5d67f64 | 543 | /* this can happen when scrub is cancelled */ |
d9d181c1 SB |
544 | if (sctx->curr != -1) { |
545 | struct scrub_bio *sbio = sctx->bios[sctx->curr]; | |
b5d67f64 SB |
546 | |
547 | for (i = 0; i < sbio->page_count; i++) { | |
ff023aac | 548 | WARN_ON(!sbio->pagev[i]->page); |
b5d67f64 SB |
549 | scrub_block_put(sbio->pagev[i]->sblock); |
550 | } | |
551 | bio_put(sbio->bio); | |
552 | } | |
553 | ||
ff023aac | 554 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
d9d181c1 | 555 | struct scrub_bio *sbio = sctx->bios[i]; |
a2de733c AJ |
556 | |
557 | if (!sbio) | |
558 | break; | |
a2de733c AJ |
559 | kfree(sbio); |
560 | } | |
561 | ||
3fb99303 | 562 | kfree(sctx->wr_curr_bio); |
d9d181c1 SB |
563 | scrub_free_csums(sctx); |
564 | kfree(sctx); | |
a2de733c AJ |
565 | } |
566 | ||
f55985f4 FM |
567 | static void scrub_put_ctx(struct scrub_ctx *sctx) |
568 | { | |
99f4cdb1 | 569 | if (refcount_dec_and_test(&sctx->refs)) |
f55985f4 FM |
570 | scrub_free_ctx(sctx); |
571 | } | |
572 | ||
92f7ba43 DS |
573 | static noinline_for_stack struct scrub_ctx *scrub_setup_ctx( |
574 | struct btrfs_fs_info *fs_info, int is_dev_replace) | |
a2de733c | 575 | { |
d9d181c1 | 576 | struct scrub_ctx *sctx; |
a2de733c | 577 | int i; |
a2de733c | 578 | |
58c4e173 | 579 | sctx = kzalloc(sizeof(*sctx), GFP_KERNEL); |
d9d181c1 | 580 | if (!sctx) |
a2de733c | 581 | goto nomem; |
99f4cdb1 | 582 | refcount_set(&sctx->refs, 1); |
63a212ab | 583 | sctx->is_dev_replace = is_dev_replace; |
b54ffb73 | 584 | sctx->pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; |
d9d181c1 | 585 | sctx->curr = -1; |
92f7ba43 | 586 | sctx->fs_info = fs_info; |
ff023aac | 587 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
a2de733c AJ |
588 | struct scrub_bio *sbio; |
589 | ||
58c4e173 | 590 | sbio = kzalloc(sizeof(*sbio), GFP_KERNEL); |
a2de733c AJ |
591 | if (!sbio) |
592 | goto nomem; | |
d9d181c1 | 593 | sctx->bios[i] = sbio; |
a2de733c | 594 | |
a2de733c | 595 | sbio->index = i; |
d9d181c1 | 596 | sbio->sctx = sctx; |
b5d67f64 | 597 | sbio->page_count = 0; |
9e0af237 LB |
598 | btrfs_init_work(&sbio->work, btrfs_scrub_helper, |
599 | scrub_bio_end_io_worker, NULL, NULL); | |
a2de733c | 600 | |
ff023aac | 601 | if (i != SCRUB_BIOS_PER_SCTX - 1) |
d9d181c1 | 602 | sctx->bios[i]->next_free = i + 1; |
0ef8e451 | 603 | else |
d9d181c1 SB |
604 | sctx->bios[i]->next_free = -1; |
605 | } | |
606 | sctx->first_free = 0; | |
b6bfebc1 SB |
607 | atomic_set(&sctx->bios_in_flight, 0); |
608 | atomic_set(&sctx->workers_pending, 0); | |
d9d181c1 SB |
609 | atomic_set(&sctx->cancel_req, 0); |
610 | sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
611 | INIT_LIST_HEAD(&sctx->csum_list); | |
612 | ||
613 | spin_lock_init(&sctx->list_lock); | |
614 | spin_lock_init(&sctx->stat_lock); | |
615 | init_waitqueue_head(&sctx->list_wait); | |
ff023aac | 616 | |
3fb99303 DS |
617 | WARN_ON(sctx->wr_curr_bio != NULL); |
618 | mutex_init(&sctx->wr_lock); | |
619 | sctx->wr_curr_bio = NULL; | |
8fcdac3f | 620 | if (is_dev_replace) { |
ded56184 | 621 | WARN_ON(!fs_info->dev_replace.tgtdev); |
3fb99303 | 622 | sctx->pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO; |
ded56184 | 623 | sctx->wr_tgtdev = fs_info->dev_replace.tgtdev; |
2073c4c2 | 624 | sctx->flush_all_writes = false; |
ff023aac | 625 | } |
8fcdac3f | 626 | |
d9d181c1 | 627 | return sctx; |
a2de733c AJ |
628 | |
629 | nomem: | |
d9d181c1 | 630 | scrub_free_ctx(sctx); |
a2de733c AJ |
631 | return ERR_PTR(-ENOMEM); |
632 | } | |
633 | ||
ff023aac SB |
634 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, |
635 | void *warn_ctx) | |
558540c1 JS |
636 | { |
637 | u64 isize; | |
638 | u32 nlink; | |
639 | int ret; | |
640 | int i; | |
de2491fd | 641 | unsigned nofs_flag; |
558540c1 JS |
642 | struct extent_buffer *eb; |
643 | struct btrfs_inode_item *inode_item; | |
ff023aac | 644 | struct scrub_warning *swarn = warn_ctx; |
fb456252 | 645 | struct btrfs_fs_info *fs_info = swarn->dev->fs_info; |
558540c1 JS |
646 | struct inode_fs_paths *ipath = NULL; |
647 | struct btrfs_root *local_root; | |
648 | struct btrfs_key root_key; | |
1d4c08e0 | 649 | struct btrfs_key key; |
558540c1 JS |
650 | |
651 | root_key.objectid = root; | |
652 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
653 | root_key.offset = (u64)-1; | |
654 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
655 | if (IS_ERR(local_root)) { | |
656 | ret = PTR_ERR(local_root); | |
657 | goto err; | |
658 | } | |
659 | ||
14692cc1 DS |
660 | /* |
661 | * this makes the path point to (inum INODE_ITEM ioff) | |
662 | */ | |
1d4c08e0 DS |
663 | key.objectid = inum; |
664 | key.type = BTRFS_INODE_ITEM_KEY; | |
665 | key.offset = 0; | |
666 | ||
667 | ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0); | |
558540c1 JS |
668 | if (ret) { |
669 | btrfs_release_path(swarn->path); | |
670 | goto err; | |
671 | } | |
672 | ||
673 | eb = swarn->path->nodes[0]; | |
674 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], | |
675 | struct btrfs_inode_item); | |
676 | isize = btrfs_inode_size(eb, inode_item); | |
677 | nlink = btrfs_inode_nlink(eb, inode_item); | |
678 | btrfs_release_path(swarn->path); | |
679 | ||
de2491fd DS |
680 | /* |
681 | * init_path might indirectly call vmalloc, or use GFP_KERNEL. Scrub | |
682 | * uses GFP_NOFS in this context, so we keep it consistent but it does | |
683 | * not seem to be strictly necessary. | |
684 | */ | |
685 | nofs_flag = memalloc_nofs_save(); | |
558540c1 | 686 | ipath = init_ipath(4096, local_root, swarn->path); |
de2491fd | 687 | memalloc_nofs_restore(nofs_flag); |
26bdef54 DC |
688 | if (IS_ERR(ipath)) { |
689 | ret = PTR_ERR(ipath); | |
690 | ipath = NULL; | |
691 | goto err; | |
692 | } | |
558540c1 JS |
693 | ret = paths_from_inode(inum, ipath); |
694 | ||
695 | if (ret < 0) | |
696 | goto err; | |
697 | ||
698 | /* | |
699 | * we deliberately ignore the bit ipath might have been too small to | |
700 | * hold all of the paths here | |
701 | */ | |
702 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) | |
5d163e0e | 703 | btrfs_warn_in_rcu(fs_info, |
6aa21263 | 704 | "%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu, length %llu, links %u (path: %s)", |
5d163e0e JM |
705 | swarn->errstr, swarn->logical, |
706 | rcu_str_deref(swarn->dev->name), | |
6aa21263 | 707 | swarn->physical, |
5d163e0e JM |
708 | root, inum, offset, |
709 | min(isize - offset, (u64)PAGE_SIZE), nlink, | |
710 | (char *)(unsigned long)ipath->fspath->val[i]); | |
558540c1 JS |
711 | |
712 | free_ipath(ipath); | |
713 | return 0; | |
714 | ||
715 | err: | |
5d163e0e | 716 | btrfs_warn_in_rcu(fs_info, |
6aa21263 | 717 | "%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu: path resolving failed with ret=%d", |
5d163e0e JM |
718 | swarn->errstr, swarn->logical, |
719 | rcu_str_deref(swarn->dev->name), | |
6aa21263 | 720 | swarn->physical, |
5d163e0e | 721 | root, inum, offset, ret); |
558540c1 JS |
722 | |
723 | free_ipath(ipath); | |
724 | return 0; | |
725 | } | |
726 | ||
b5d67f64 | 727 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
558540c1 | 728 | { |
a36cf8b8 SB |
729 | struct btrfs_device *dev; |
730 | struct btrfs_fs_info *fs_info; | |
558540c1 JS |
731 | struct btrfs_path *path; |
732 | struct btrfs_key found_key; | |
733 | struct extent_buffer *eb; | |
734 | struct btrfs_extent_item *ei; | |
735 | struct scrub_warning swarn; | |
69917e43 LB |
736 | unsigned long ptr = 0; |
737 | u64 extent_item_pos; | |
738 | u64 flags = 0; | |
558540c1 | 739 | u64 ref_root; |
69917e43 | 740 | u32 item_size; |
07c9a8e0 | 741 | u8 ref_level = 0; |
69917e43 | 742 | int ret; |
558540c1 | 743 | |
a36cf8b8 | 744 | WARN_ON(sblock->page_count < 1); |
7a9e9987 | 745 | dev = sblock->pagev[0]->dev; |
fb456252 | 746 | fs_info = sblock->sctx->fs_info; |
a36cf8b8 | 747 | |
558540c1 | 748 | path = btrfs_alloc_path(); |
8b9456da DS |
749 | if (!path) |
750 | return; | |
558540c1 | 751 | |
6aa21263 | 752 | swarn.physical = sblock->pagev[0]->physical; |
7a9e9987 | 753 | swarn.logical = sblock->pagev[0]->logical; |
558540c1 | 754 | swarn.errstr = errstr; |
a36cf8b8 | 755 | swarn.dev = NULL; |
558540c1 | 756 | |
69917e43 LB |
757 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, |
758 | &flags); | |
558540c1 JS |
759 | if (ret < 0) |
760 | goto out; | |
761 | ||
4692cf58 | 762 | extent_item_pos = swarn.logical - found_key.objectid; |
558540c1 JS |
763 | swarn.extent_item_size = found_key.offset; |
764 | ||
765 | eb = path->nodes[0]; | |
766 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); | |
767 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
768 | ||
69917e43 | 769 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
558540c1 | 770 | do { |
6eda71d0 LB |
771 | ret = tree_backref_for_extent(&ptr, eb, &found_key, ei, |
772 | item_size, &ref_root, | |
773 | &ref_level); | |
ecaeb14b | 774 | btrfs_warn_in_rcu(fs_info, |
6aa21263 | 775 | "%s at logical %llu on dev %s, physical %llu: metadata %s (level %d) in tree %llu", |
5d163e0e | 776 | errstr, swarn.logical, |
606686ee | 777 | rcu_str_deref(dev->name), |
6aa21263 | 778 | swarn.physical, |
558540c1 JS |
779 | ref_level ? "node" : "leaf", |
780 | ret < 0 ? -1 : ref_level, | |
781 | ret < 0 ? -1 : ref_root); | |
782 | } while (ret != 1); | |
d8fe29e9 | 783 | btrfs_release_path(path); |
558540c1 | 784 | } else { |
d8fe29e9 | 785 | btrfs_release_path(path); |
558540c1 | 786 | swarn.path = path; |
a36cf8b8 | 787 | swarn.dev = dev; |
7a3ae2f8 JS |
788 | iterate_extent_inodes(fs_info, found_key.objectid, |
789 | extent_item_pos, 1, | |
c995ab3c | 790 | scrub_print_warning_inode, &swarn, false); |
558540c1 JS |
791 | } |
792 | ||
793 | out: | |
794 | btrfs_free_path(path); | |
558540c1 JS |
795 | } |
796 | ||
af8e2d1d MX |
797 | static inline void scrub_get_recover(struct scrub_recover *recover) |
798 | { | |
6f615018 | 799 | refcount_inc(&recover->refs); |
af8e2d1d MX |
800 | } |
801 | ||
e501bfe3 QW |
802 | static inline void scrub_put_recover(struct btrfs_fs_info *fs_info, |
803 | struct scrub_recover *recover) | |
af8e2d1d | 804 | { |
6f615018 | 805 | if (refcount_dec_and_test(&recover->refs)) { |
e501bfe3 | 806 | btrfs_bio_counter_dec(fs_info); |
6e9606d2 | 807 | btrfs_put_bbio(recover->bbio); |
af8e2d1d MX |
808 | kfree(recover); |
809 | } | |
810 | } | |
811 | ||
a2de733c | 812 | /* |
b5d67f64 SB |
813 | * scrub_handle_errored_block gets called when either verification of the |
814 | * pages failed or the bio failed to read, e.g. with EIO. In the latter | |
815 | * case, this function handles all pages in the bio, even though only one | |
816 | * may be bad. | |
817 | * The goal of this function is to repair the errored block by using the | |
818 | * contents of one of the mirrors. | |
a2de733c | 819 | */ |
b5d67f64 | 820 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
a2de733c | 821 | { |
d9d181c1 | 822 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
a36cf8b8 | 823 | struct btrfs_device *dev; |
b5d67f64 | 824 | struct btrfs_fs_info *fs_info; |
b5d67f64 | 825 | u64 logical; |
b5d67f64 SB |
826 | unsigned int failed_mirror_index; |
827 | unsigned int is_metadata; | |
828 | unsigned int have_csum; | |
b5d67f64 SB |
829 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ |
830 | struct scrub_block *sblock_bad; | |
831 | int ret; | |
832 | int mirror_index; | |
833 | int page_num; | |
834 | int success; | |
28d70e23 | 835 | bool full_stripe_locked; |
7c3c7cb9 | 836 | unsigned int nofs_flag; |
558540c1 | 837 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
b5d67f64 SB |
838 | DEFAULT_RATELIMIT_BURST); |
839 | ||
840 | BUG_ON(sblock_to_check->page_count < 1); | |
fb456252 | 841 | fs_info = sctx->fs_info; |
4ded4f63 SB |
842 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
843 | /* | |
844 | * if we find an error in a super block, we just report it. | |
845 | * They will get written with the next transaction commit | |
846 | * anyway | |
847 | */ | |
848 | spin_lock(&sctx->stat_lock); | |
849 | ++sctx->stat.super_errors; | |
850 | spin_unlock(&sctx->stat_lock); | |
851 | return 0; | |
852 | } | |
7a9e9987 | 853 | logical = sblock_to_check->pagev[0]->logical; |
7a9e9987 SB |
854 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); |
855 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; | |
856 | is_metadata = !(sblock_to_check->pagev[0]->flags & | |
b5d67f64 | 857 | BTRFS_EXTENT_FLAG_DATA); |
7a9e9987 | 858 | have_csum = sblock_to_check->pagev[0]->have_csum; |
7a9e9987 | 859 | dev = sblock_to_check->pagev[0]->dev; |
13db62b7 | 860 | |
7c3c7cb9 FM |
861 | /* |
862 | * We must use GFP_NOFS because the scrub task might be waiting for a | |
863 | * worker task executing this function and in turn a transaction commit | |
864 | * might be waiting the scrub task to pause (which needs to wait for all | |
865 | * the worker tasks to complete before pausing). | |
866 | * We do allocations in the workers through insert_full_stripe_lock() | |
867 | * and scrub_add_page_to_wr_bio(), which happens down the call chain of | |
868 | * this function. | |
869 | */ | |
870 | nofs_flag = memalloc_nofs_save(); | |
28d70e23 QW |
871 | /* |
872 | * For RAID5/6, race can happen for a different device scrub thread. | |
873 | * For data corruption, Parity and Data threads will both try | |
874 | * to recovery the data. | |
875 | * Race can lead to doubly added csum error, or even unrecoverable | |
876 | * error. | |
877 | */ | |
878 | ret = lock_full_stripe(fs_info, logical, &full_stripe_locked); | |
879 | if (ret < 0) { | |
7c3c7cb9 | 880 | memalloc_nofs_restore(nofs_flag); |
28d70e23 QW |
881 | spin_lock(&sctx->stat_lock); |
882 | if (ret == -ENOMEM) | |
883 | sctx->stat.malloc_errors++; | |
884 | sctx->stat.read_errors++; | |
885 | sctx->stat.uncorrectable_errors++; | |
886 | spin_unlock(&sctx->stat_lock); | |
887 | return ret; | |
888 | } | |
889 | ||
b5d67f64 SB |
890 | /* |
891 | * read all mirrors one after the other. This includes to | |
892 | * re-read the extent or metadata block that failed (that was | |
893 | * the cause that this fixup code is called) another time, | |
894 | * page by page this time in order to know which pages | |
895 | * caused I/O errors and which ones are good (for all mirrors). | |
896 | * It is the goal to handle the situation when more than one | |
897 | * mirror contains I/O errors, but the errors do not | |
898 | * overlap, i.e. the data can be repaired by selecting the | |
899 | * pages from those mirrors without I/O error on the | |
900 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) | |
901 | * would be that mirror #1 has an I/O error on the first page, | |
902 | * the second page is good, and mirror #2 has an I/O error on | |
903 | * the second page, but the first page is good. | |
904 | * Then the first page of the first mirror can be repaired by | |
905 | * taking the first page of the second mirror, and the | |
906 | * second page of the second mirror can be repaired by | |
907 | * copying the contents of the 2nd page of the 1st mirror. | |
908 | * One more note: if the pages of one mirror contain I/O | |
909 | * errors, the checksum cannot be verified. In order to get | |
910 | * the best data for repairing, the first attempt is to find | |
911 | * a mirror without I/O errors and with a validated checksum. | |
912 | * Only if this is not possible, the pages are picked from | |
913 | * mirrors with I/O errors without considering the checksum. | |
914 | * If the latter is the case, at the end, the checksum of the | |
915 | * repaired area is verified in order to correctly maintain | |
916 | * the statistics. | |
917 | */ | |
918 | ||
31e818fe | 919 | sblocks_for_recheck = kcalloc(BTRFS_MAX_MIRRORS, |
7c3c7cb9 | 920 | sizeof(*sblocks_for_recheck), GFP_KERNEL); |
b5d67f64 | 921 | if (!sblocks_for_recheck) { |
d9d181c1 SB |
922 | spin_lock(&sctx->stat_lock); |
923 | sctx->stat.malloc_errors++; | |
924 | sctx->stat.read_errors++; | |
925 | sctx->stat.uncorrectable_errors++; | |
926 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 927 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 928 | goto out; |
a2de733c AJ |
929 | } |
930 | ||
b5d67f64 | 931 | /* setup the context, map the logical blocks and alloc the pages */ |
be50a8dd | 932 | ret = scrub_setup_recheck_block(sblock_to_check, sblocks_for_recheck); |
b5d67f64 | 933 | if (ret) { |
d9d181c1 SB |
934 | spin_lock(&sctx->stat_lock); |
935 | sctx->stat.read_errors++; | |
936 | sctx->stat.uncorrectable_errors++; | |
937 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 938 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 SB |
939 | goto out; |
940 | } | |
941 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); | |
942 | sblock_bad = sblocks_for_recheck + failed_mirror_index; | |
13db62b7 | 943 | |
b5d67f64 | 944 | /* build and submit the bios for the failed mirror, check checksums */ |
affe4a5a | 945 | scrub_recheck_block(fs_info, sblock_bad, 1); |
a2de733c | 946 | |
b5d67f64 SB |
947 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
948 | sblock_bad->no_io_error_seen) { | |
949 | /* | |
950 | * the error disappeared after reading page by page, or | |
951 | * the area was part of a huge bio and other parts of the | |
952 | * bio caused I/O errors, or the block layer merged several | |
953 | * read requests into one and the error is caused by a | |
954 | * different bio (usually one of the two latter cases is | |
955 | * the cause) | |
956 | */ | |
d9d181c1 SB |
957 | spin_lock(&sctx->stat_lock); |
958 | sctx->stat.unverified_errors++; | |
5a6ac9ea | 959 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 960 | spin_unlock(&sctx->stat_lock); |
a2de733c | 961 | |
ff023aac SB |
962 | if (sctx->is_dev_replace) |
963 | scrub_write_block_to_dev_replace(sblock_bad); | |
b5d67f64 | 964 | goto out; |
a2de733c | 965 | } |
a2de733c | 966 | |
b5d67f64 | 967 | if (!sblock_bad->no_io_error_seen) { |
d9d181c1 SB |
968 | spin_lock(&sctx->stat_lock); |
969 | sctx->stat.read_errors++; | |
970 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
971 | if (__ratelimit(&_rs)) |
972 | scrub_print_warning("i/o error", sblock_to_check); | |
a36cf8b8 | 973 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 974 | } else if (sblock_bad->checksum_error) { |
d9d181c1 SB |
975 | spin_lock(&sctx->stat_lock); |
976 | sctx->stat.csum_errors++; | |
977 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
978 | if (__ratelimit(&_rs)) |
979 | scrub_print_warning("checksum error", sblock_to_check); | |
a36cf8b8 | 980 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 981 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 982 | } else if (sblock_bad->header_error) { |
d9d181c1 SB |
983 | spin_lock(&sctx->stat_lock); |
984 | sctx->stat.verify_errors++; | |
985 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
986 | if (__ratelimit(&_rs)) |
987 | scrub_print_warning("checksum/header error", | |
988 | sblock_to_check); | |
442a4f63 | 989 | if (sblock_bad->generation_error) |
a36cf8b8 | 990 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 SB |
991 | BTRFS_DEV_STAT_GENERATION_ERRS); |
992 | else | |
a36cf8b8 | 993 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 994 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 995 | } |
a2de733c | 996 | |
33ef30ad ID |
997 | if (sctx->readonly) { |
998 | ASSERT(!sctx->is_dev_replace); | |
999 | goto out; | |
1000 | } | |
a2de733c | 1001 | |
b5d67f64 SB |
1002 | /* |
1003 | * now build and submit the bios for the other mirrors, check | |
cb2ced73 SB |
1004 | * checksums. |
1005 | * First try to pick the mirror which is completely without I/O | |
b5d67f64 SB |
1006 | * errors and also does not have a checksum error. |
1007 | * If one is found, and if a checksum is present, the full block | |
1008 | * that is known to contain an error is rewritten. Afterwards | |
1009 | * the block is known to be corrected. | |
1010 | * If a mirror is found which is completely correct, and no | |
1011 | * checksum is present, only those pages are rewritten that had | |
1012 | * an I/O error in the block to be repaired, since it cannot be | |
1013 | * determined, which copy of the other pages is better (and it | |
1014 | * could happen otherwise that a correct page would be | |
1015 | * overwritten by a bad one). | |
1016 | */ | |
762221f0 | 1017 | for (mirror_index = 0; ;mirror_index++) { |
cb2ced73 | 1018 | struct scrub_block *sblock_other; |
b5d67f64 | 1019 | |
cb2ced73 SB |
1020 | if (mirror_index == failed_mirror_index) |
1021 | continue; | |
762221f0 LB |
1022 | |
1023 | /* raid56's mirror can be more than BTRFS_MAX_MIRRORS */ | |
1024 | if (!scrub_is_page_on_raid56(sblock_bad->pagev[0])) { | |
1025 | if (mirror_index >= BTRFS_MAX_MIRRORS) | |
1026 | break; | |
1027 | if (!sblocks_for_recheck[mirror_index].page_count) | |
1028 | break; | |
1029 | ||
1030 | sblock_other = sblocks_for_recheck + mirror_index; | |
1031 | } else { | |
1032 | struct scrub_recover *r = sblock_bad->pagev[0]->recover; | |
1033 | int max_allowed = r->bbio->num_stripes - | |
1034 | r->bbio->num_tgtdevs; | |
1035 | ||
1036 | if (mirror_index >= max_allowed) | |
1037 | break; | |
1038 | if (!sblocks_for_recheck[1].page_count) | |
1039 | break; | |
1040 | ||
1041 | ASSERT(failed_mirror_index == 0); | |
1042 | sblock_other = sblocks_for_recheck + 1; | |
1043 | sblock_other->pagev[0]->mirror_num = 1 + mirror_index; | |
1044 | } | |
cb2ced73 SB |
1045 | |
1046 | /* build and submit the bios, check checksums */ | |
affe4a5a | 1047 | scrub_recheck_block(fs_info, sblock_other, 0); |
34f5c8e9 SB |
1048 | |
1049 | if (!sblock_other->header_error && | |
b5d67f64 SB |
1050 | !sblock_other->checksum_error && |
1051 | sblock_other->no_io_error_seen) { | |
ff023aac SB |
1052 | if (sctx->is_dev_replace) { |
1053 | scrub_write_block_to_dev_replace(sblock_other); | |
114ab50d | 1054 | goto corrected_error; |
ff023aac | 1055 | } else { |
ff023aac | 1056 | ret = scrub_repair_block_from_good_copy( |
114ab50d ZL |
1057 | sblock_bad, sblock_other); |
1058 | if (!ret) | |
1059 | goto corrected_error; | |
ff023aac | 1060 | } |
b5d67f64 SB |
1061 | } |
1062 | } | |
a2de733c | 1063 | |
b968fed1 ZL |
1064 | if (sblock_bad->no_io_error_seen && !sctx->is_dev_replace) |
1065 | goto did_not_correct_error; | |
ff023aac SB |
1066 | |
1067 | /* | |
ff023aac | 1068 | * In case of I/O errors in the area that is supposed to be |
b5d67f64 SB |
1069 | * repaired, continue by picking good copies of those pages. |
1070 | * Select the good pages from mirrors to rewrite bad pages from | |
1071 | * the area to fix. Afterwards verify the checksum of the block | |
1072 | * that is supposed to be repaired. This verification step is | |
1073 | * only done for the purpose of statistic counting and for the | |
1074 | * final scrub report, whether errors remain. | |
1075 | * A perfect algorithm could make use of the checksum and try | |
1076 | * all possible combinations of pages from the different mirrors | |
1077 | * until the checksum verification succeeds. For example, when | |
1078 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page | |
1079 | * of mirror #2 is readable but the final checksum test fails, | |
1080 | * then the 2nd page of mirror #3 could be tried, whether now | |
01327610 | 1081 | * the final checksum succeeds. But this would be a rare |
b5d67f64 SB |
1082 | * exception and is therefore not implemented. At least it is |
1083 | * avoided that the good copy is overwritten. | |
1084 | * A more useful improvement would be to pick the sectors | |
1085 | * without I/O error based on sector sizes (512 bytes on legacy | |
1086 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one | |
1087 | * mirror could be repaired by taking 512 byte of a different | |
1088 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE | |
1089 | * area are unreadable. | |
a2de733c | 1090 | */ |
b5d67f64 | 1091 | success = 1; |
b968fed1 ZL |
1092 | for (page_num = 0; page_num < sblock_bad->page_count; |
1093 | page_num++) { | |
7a9e9987 | 1094 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
b968fed1 | 1095 | struct scrub_block *sblock_other = NULL; |
b5d67f64 | 1096 | |
b968fed1 ZL |
1097 | /* skip no-io-error page in scrub */ |
1098 | if (!page_bad->io_error && !sctx->is_dev_replace) | |
a2de733c | 1099 | continue; |
b5d67f64 | 1100 | |
4759700a LB |
1101 | if (scrub_is_page_on_raid56(sblock_bad->pagev[0])) { |
1102 | /* | |
1103 | * In case of dev replace, if raid56 rebuild process | |
1104 | * didn't work out correct data, then copy the content | |
1105 | * in sblock_bad to make sure target device is identical | |
1106 | * to source device, instead of writing garbage data in | |
1107 | * sblock_for_recheck array to target device. | |
1108 | */ | |
1109 | sblock_other = NULL; | |
1110 | } else if (page_bad->io_error) { | |
1111 | /* try to find no-io-error page in mirrors */ | |
b968fed1 ZL |
1112 | for (mirror_index = 0; |
1113 | mirror_index < BTRFS_MAX_MIRRORS && | |
1114 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1115 | mirror_index++) { | |
1116 | if (!sblocks_for_recheck[mirror_index]. | |
1117 | pagev[page_num]->io_error) { | |
1118 | sblock_other = sblocks_for_recheck + | |
1119 | mirror_index; | |
1120 | break; | |
b5d67f64 SB |
1121 | } |
1122 | } | |
b968fed1 ZL |
1123 | if (!sblock_other) |
1124 | success = 0; | |
96e36920 | 1125 | } |
a2de733c | 1126 | |
b968fed1 ZL |
1127 | if (sctx->is_dev_replace) { |
1128 | /* | |
1129 | * did not find a mirror to fetch the page | |
1130 | * from. scrub_write_page_to_dev_replace() | |
1131 | * handles this case (page->io_error), by | |
1132 | * filling the block with zeros before | |
1133 | * submitting the write request | |
1134 | */ | |
1135 | if (!sblock_other) | |
1136 | sblock_other = sblock_bad; | |
1137 | ||
1138 | if (scrub_write_page_to_dev_replace(sblock_other, | |
1139 | page_num) != 0) { | |
e37abe97 | 1140 | atomic64_inc( |
0b246afa | 1141 | &fs_info->dev_replace.num_write_errors); |
b968fed1 ZL |
1142 | success = 0; |
1143 | } | |
1144 | } else if (sblock_other) { | |
1145 | ret = scrub_repair_page_from_good_copy(sblock_bad, | |
1146 | sblock_other, | |
1147 | page_num, 0); | |
1148 | if (0 == ret) | |
1149 | page_bad->io_error = 0; | |
1150 | else | |
1151 | success = 0; | |
b5d67f64 | 1152 | } |
a2de733c | 1153 | } |
a2de733c | 1154 | |
b968fed1 | 1155 | if (success && !sctx->is_dev_replace) { |
b5d67f64 SB |
1156 | if (is_metadata || have_csum) { |
1157 | /* | |
1158 | * need to verify the checksum now that all | |
1159 | * sectors on disk are repaired (the write | |
1160 | * request for data to be repaired is on its way). | |
1161 | * Just be lazy and use scrub_recheck_block() | |
1162 | * which re-reads the data before the checksum | |
1163 | * is verified, but most likely the data comes out | |
1164 | * of the page cache. | |
1165 | */ | |
affe4a5a | 1166 | scrub_recheck_block(fs_info, sblock_bad, 1); |
34f5c8e9 | 1167 | if (!sblock_bad->header_error && |
b5d67f64 SB |
1168 | !sblock_bad->checksum_error && |
1169 | sblock_bad->no_io_error_seen) | |
1170 | goto corrected_error; | |
1171 | else | |
1172 | goto did_not_correct_error; | |
1173 | } else { | |
1174 | corrected_error: | |
d9d181c1 SB |
1175 | spin_lock(&sctx->stat_lock); |
1176 | sctx->stat.corrected_errors++; | |
5a6ac9ea | 1177 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 1178 | spin_unlock(&sctx->stat_lock); |
b14af3b4 DS |
1179 | btrfs_err_rl_in_rcu(fs_info, |
1180 | "fixed up error at logical %llu on dev %s", | |
c1c9ff7c | 1181 | logical, rcu_str_deref(dev->name)); |
8628764e | 1182 | } |
b5d67f64 SB |
1183 | } else { |
1184 | did_not_correct_error: | |
d9d181c1 SB |
1185 | spin_lock(&sctx->stat_lock); |
1186 | sctx->stat.uncorrectable_errors++; | |
1187 | spin_unlock(&sctx->stat_lock); | |
b14af3b4 DS |
1188 | btrfs_err_rl_in_rcu(fs_info, |
1189 | "unable to fixup (regular) error at logical %llu on dev %s", | |
c1c9ff7c | 1190 | logical, rcu_str_deref(dev->name)); |
96e36920 | 1191 | } |
a2de733c | 1192 | |
b5d67f64 SB |
1193 | out: |
1194 | if (sblocks_for_recheck) { | |
1195 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; | |
1196 | mirror_index++) { | |
1197 | struct scrub_block *sblock = sblocks_for_recheck + | |
1198 | mirror_index; | |
af8e2d1d | 1199 | struct scrub_recover *recover; |
b5d67f64 SB |
1200 | int page_index; |
1201 | ||
7a9e9987 SB |
1202 | for (page_index = 0; page_index < sblock->page_count; |
1203 | page_index++) { | |
1204 | sblock->pagev[page_index]->sblock = NULL; | |
af8e2d1d MX |
1205 | recover = sblock->pagev[page_index]->recover; |
1206 | if (recover) { | |
e501bfe3 | 1207 | scrub_put_recover(fs_info, recover); |
af8e2d1d MX |
1208 | sblock->pagev[page_index]->recover = |
1209 | NULL; | |
1210 | } | |
7a9e9987 SB |
1211 | scrub_page_put(sblock->pagev[page_index]); |
1212 | } | |
b5d67f64 SB |
1213 | } |
1214 | kfree(sblocks_for_recheck); | |
1215 | } | |
a2de733c | 1216 | |
28d70e23 | 1217 | ret = unlock_full_stripe(fs_info, logical, full_stripe_locked); |
7c3c7cb9 | 1218 | memalloc_nofs_restore(nofs_flag); |
28d70e23 QW |
1219 | if (ret < 0) |
1220 | return ret; | |
b5d67f64 SB |
1221 | return 0; |
1222 | } | |
a2de733c | 1223 | |
8e5cfb55 | 1224 | static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio) |
af8e2d1d | 1225 | { |
10f11900 ZL |
1226 | if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5) |
1227 | return 2; | |
1228 | else if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID6) | |
1229 | return 3; | |
1230 | else | |
af8e2d1d | 1231 | return (int)bbio->num_stripes; |
af8e2d1d MX |
1232 | } |
1233 | ||
10f11900 ZL |
1234 | static inline void scrub_stripe_index_and_offset(u64 logical, u64 map_type, |
1235 | u64 *raid_map, | |
af8e2d1d MX |
1236 | u64 mapped_length, |
1237 | int nstripes, int mirror, | |
1238 | int *stripe_index, | |
1239 | u64 *stripe_offset) | |
1240 | { | |
1241 | int i; | |
1242 | ||
ffe2d203 | 1243 | if (map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
af8e2d1d MX |
1244 | /* RAID5/6 */ |
1245 | for (i = 0; i < nstripes; i++) { | |
1246 | if (raid_map[i] == RAID6_Q_STRIPE || | |
1247 | raid_map[i] == RAID5_P_STRIPE) | |
1248 | continue; | |
1249 | ||
1250 | if (logical >= raid_map[i] && | |
1251 | logical < raid_map[i] + mapped_length) | |
1252 | break; | |
1253 | } | |
1254 | ||
1255 | *stripe_index = i; | |
1256 | *stripe_offset = logical - raid_map[i]; | |
1257 | } else { | |
1258 | /* The other RAID type */ | |
1259 | *stripe_index = mirror; | |
1260 | *stripe_offset = 0; | |
1261 | } | |
1262 | } | |
1263 | ||
be50a8dd | 1264 | static int scrub_setup_recheck_block(struct scrub_block *original_sblock, |
b5d67f64 SB |
1265 | struct scrub_block *sblocks_for_recheck) |
1266 | { | |
be50a8dd | 1267 | struct scrub_ctx *sctx = original_sblock->sctx; |
fb456252 | 1268 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
be50a8dd ZL |
1269 | u64 length = original_sblock->page_count * PAGE_SIZE; |
1270 | u64 logical = original_sblock->pagev[0]->logical; | |
4734b7ed ZL |
1271 | u64 generation = original_sblock->pagev[0]->generation; |
1272 | u64 flags = original_sblock->pagev[0]->flags; | |
1273 | u64 have_csum = original_sblock->pagev[0]->have_csum; | |
af8e2d1d MX |
1274 | struct scrub_recover *recover; |
1275 | struct btrfs_bio *bbio; | |
af8e2d1d MX |
1276 | u64 sublen; |
1277 | u64 mapped_length; | |
1278 | u64 stripe_offset; | |
1279 | int stripe_index; | |
be50a8dd | 1280 | int page_index = 0; |
b5d67f64 | 1281 | int mirror_index; |
af8e2d1d | 1282 | int nmirrors; |
b5d67f64 SB |
1283 | int ret; |
1284 | ||
1285 | /* | |
57019345 | 1286 | * note: the two members refs and outstanding_pages |
b5d67f64 SB |
1287 | * are not used (and not set) in the blocks that are used for |
1288 | * the recheck procedure | |
1289 | */ | |
1290 | ||
b5d67f64 | 1291 | while (length > 0) { |
af8e2d1d MX |
1292 | sublen = min_t(u64, length, PAGE_SIZE); |
1293 | mapped_length = sublen; | |
1294 | bbio = NULL; | |
a2de733c | 1295 | |
b5d67f64 SB |
1296 | /* |
1297 | * with a length of PAGE_SIZE, each returned stripe | |
1298 | * represents one mirror | |
1299 | */ | |
e501bfe3 | 1300 | btrfs_bio_counter_inc_blocked(fs_info); |
cf8cddd3 | 1301 | ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, |
825ad4c9 | 1302 | logical, &mapped_length, &bbio); |
b5d67f64 | 1303 | if (ret || !bbio || mapped_length < sublen) { |
6e9606d2 | 1304 | btrfs_put_bbio(bbio); |
e501bfe3 | 1305 | btrfs_bio_counter_dec(fs_info); |
b5d67f64 SB |
1306 | return -EIO; |
1307 | } | |
a2de733c | 1308 | |
af8e2d1d MX |
1309 | recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS); |
1310 | if (!recover) { | |
6e9606d2 | 1311 | btrfs_put_bbio(bbio); |
e501bfe3 | 1312 | btrfs_bio_counter_dec(fs_info); |
af8e2d1d MX |
1313 | return -ENOMEM; |
1314 | } | |
1315 | ||
6f615018 | 1316 | refcount_set(&recover->refs, 1); |
af8e2d1d | 1317 | recover->bbio = bbio; |
af8e2d1d MX |
1318 | recover->map_length = mapped_length; |
1319 | ||
24731149 | 1320 | BUG_ON(page_index >= SCRUB_MAX_PAGES_PER_BLOCK); |
af8e2d1d | 1321 | |
be50a8dd | 1322 | nmirrors = min(scrub_nr_raid_mirrors(bbio), BTRFS_MAX_MIRRORS); |
10f11900 | 1323 | |
af8e2d1d | 1324 | for (mirror_index = 0; mirror_index < nmirrors; |
b5d67f64 SB |
1325 | mirror_index++) { |
1326 | struct scrub_block *sblock; | |
1327 | struct scrub_page *page; | |
1328 | ||
b5d67f64 | 1329 | sblock = sblocks_for_recheck + mirror_index; |
7a9e9987 | 1330 | sblock->sctx = sctx; |
4734b7ed | 1331 | |
7a9e9987 SB |
1332 | page = kzalloc(sizeof(*page), GFP_NOFS); |
1333 | if (!page) { | |
1334 | leave_nomem: | |
d9d181c1 SB |
1335 | spin_lock(&sctx->stat_lock); |
1336 | sctx->stat.malloc_errors++; | |
1337 | spin_unlock(&sctx->stat_lock); | |
e501bfe3 | 1338 | scrub_put_recover(fs_info, recover); |
b5d67f64 SB |
1339 | return -ENOMEM; |
1340 | } | |
7a9e9987 SB |
1341 | scrub_page_get(page); |
1342 | sblock->pagev[page_index] = page; | |
4734b7ed ZL |
1343 | page->sblock = sblock; |
1344 | page->flags = flags; | |
1345 | page->generation = generation; | |
7a9e9987 | 1346 | page->logical = logical; |
4734b7ed ZL |
1347 | page->have_csum = have_csum; |
1348 | if (have_csum) | |
1349 | memcpy(page->csum, | |
1350 | original_sblock->pagev[0]->csum, | |
1351 | sctx->csum_size); | |
af8e2d1d | 1352 | |
10f11900 ZL |
1353 | scrub_stripe_index_and_offset(logical, |
1354 | bbio->map_type, | |
1355 | bbio->raid_map, | |
af8e2d1d | 1356 | mapped_length, |
e34c330d ZL |
1357 | bbio->num_stripes - |
1358 | bbio->num_tgtdevs, | |
af8e2d1d MX |
1359 | mirror_index, |
1360 | &stripe_index, | |
1361 | &stripe_offset); | |
1362 | page->physical = bbio->stripes[stripe_index].physical + | |
1363 | stripe_offset; | |
1364 | page->dev = bbio->stripes[stripe_index].dev; | |
1365 | ||
ff023aac SB |
1366 | BUG_ON(page_index >= original_sblock->page_count); |
1367 | page->physical_for_dev_replace = | |
1368 | original_sblock->pagev[page_index]-> | |
1369 | physical_for_dev_replace; | |
7a9e9987 | 1370 | /* for missing devices, dev->bdev is NULL */ |
7a9e9987 | 1371 | page->mirror_num = mirror_index + 1; |
b5d67f64 | 1372 | sblock->page_count++; |
7a9e9987 SB |
1373 | page->page = alloc_page(GFP_NOFS); |
1374 | if (!page->page) | |
1375 | goto leave_nomem; | |
af8e2d1d MX |
1376 | |
1377 | scrub_get_recover(recover); | |
1378 | page->recover = recover; | |
b5d67f64 | 1379 | } |
e501bfe3 | 1380 | scrub_put_recover(fs_info, recover); |
b5d67f64 SB |
1381 | length -= sublen; |
1382 | logical += sublen; | |
1383 | page_index++; | |
1384 | } | |
1385 | ||
1386 | return 0; | |
96e36920 ID |
1387 | } |
1388 | ||
4246a0b6 | 1389 | static void scrub_bio_wait_endio(struct bio *bio) |
af8e2d1d | 1390 | { |
b4ff5ad7 | 1391 | complete(bio->bi_private); |
af8e2d1d MX |
1392 | } |
1393 | ||
af8e2d1d MX |
1394 | static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info, |
1395 | struct bio *bio, | |
1396 | struct scrub_page *page) | |
1397 | { | |
b4ff5ad7 | 1398 | DECLARE_COMPLETION_ONSTACK(done); |
af8e2d1d | 1399 | int ret; |
762221f0 | 1400 | int mirror_num; |
af8e2d1d | 1401 | |
af8e2d1d MX |
1402 | bio->bi_iter.bi_sector = page->logical >> 9; |
1403 | bio->bi_private = &done; | |
1404 | bio->bi_end_io = scrub_bio_wait_endio; | |
1405 | ||
762221f0 | 1406 | mirror_num = page->sblock->pagev[0]->mirror_num; |
2ff7e61e | 1407 | ret = raid56_parity_recover(fs_info, bio, page->recover->bbio, |
af8e2d1d | 1408 | page->recover->map_length, |
762221f0 | 1409 | mirror_num, 0); |
af8e2d1d MX |
1410 | if (ret) |
1411 | return ret; | |
1412 | ||
b4ff5ad7 LB |
1413 | wait_for_completion_io(&done); |
1414 | return blk_status_to_errno(bio->bi_status); | |
af8e2d1d MX |
1415 | } |
1416 | ||
6ca1765b LB |
1417 | static void scrub_recheck_block_on_raid56(struct btrfs_fs_info *fs_info, |
1418 | struct scrub_block *sblock) | |
1419 | { | |
1420 | struct scrub_page *first_page = sblock->pagev[0]; | |
1421 | struct bio *bio; | |
1422 | int page_num; | |
1423 | ||
1424 | /* All pages in sblock belong to the same stripe on the same device. */ | |
1425 | ASSERT(first_page->dev); | |
1426 | if (!first_page->dev->bdev) | |
1427 | goto out; | |
1428 | ||
1429 | bio = btrfs_io_bio_alloc(BIO_MAX_PAGES); | |
1430 | bio_set_dev(bio, first_page->dev->bdev); | |
1431 | ||
1432 | for (page_num = 0; page_num < sblock->page_count; page_num++) { | |
1433 | struct scrub_page *page = sblock->pagev[page_num]; | |
1434 | ||
1435 | WARN_ON(!page->page); | |
1436 | bio_add_page(bio, page->page, PAGE_SIZE, 0); | |
1437 | } | |
1438 | ||
1439 | if (scrub_submit_raid56_bio_wait(fs_info, bio, first_page)) { | |
1440 | bio_put(bio); | |
1441 | goto out; | |
1442 | } | |
1443 | ||
1444 | bio_put(bio); | |
1445 | ||
1446 | scrub_recheck_block_checksum(sblock); | |
1447 | ||
1448 | return; | |
1449 | out: | |
1450 | for (page_num = 0; page_num < sblock->page_count; page_num++) | |
1451 | sblock->pagev[page_num]->io_error = 1; | |
1452 | ||
1453 | sblock->no_io_error_seen = 0; | |
1454 | } | |
1455 | ||
b5d67f64 SB |
1456 | /* |
1457 | * this function will check the on disk data for checksum errors, header | |
1458 | * errors and read I/O errors. If any I/O errors happen, the exact pages | |
1459 | * which are errored are marked as being bad. The goal is to enable scrub | |
1460 | * to take those pages that are not errored from all the mirrors so that | |
1461 | * the pages that are errored in the just handled mirror can be repaired. | |
1462 | */ | |
34f5c8e9 | 1463 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
affe4a5a ZL |
1464 | struct scrub_block *sblock, |
1465 | int retry_failed_mirror) | |
96e36920 | 1466 | { |
b5d67f64 | 1467 | int page_num; |
96e36920 | 1468 | |
b5d67f64 | 1469 | sblock->no_io_error_seen = 1; |
96e36920 | 1470 | |
6ca1765b LB |
1471 | /* short cut for raid56 */ |
1472 | if (!retry_failed_mirror && scrub_is_page_on_raid56(sblock->pagev[0])) | |
1473 | return scrub_recheck_block_on_raid56(fs_info, sblock); | |
1474 | ||
b5d67f64 SB |
1475 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1476 | struct bio *bio; | |
7a9e9987 | 1477 | struct scrub_page *page = sblock->pagev[page_num]; |
b5d67f64 | 1478 | |
442a4f63 | 1479 | if (page->dev->bdev == NULL) { |
ea9947b4 SB |
1480 | page->io_error = 1; |
1481 | sblock->no_io_error_seen = 0; | |
1482 | continue; | |
1483 | } | |
1484 | ||
7a9e9987 | 1485 | WARN_ON(!page->page); |
c5e4c3d7 | 1486 | bio = btrfs_io_bio_alloc(1); |
74d46992 | 1487 | bio_set_dev(bio, page->dev->bdev); |
b5d67f64 | 1488 | |
34f5c8e9 | 1489 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
6ca1765b LB |
1490 | bio->bi_iter.bi_sector = page->physical >> 9; |
1491 | bio->bi_opf = REQ_OP_READ; | |
af8e2d1d | 1492 | |
6ca1765b LB |
1493 | if (btrfsic_submit_bio_wait(bio)) { |
1494 | page->io_error = 1; | |
1495 | sblock->no_io_error_seen = 0; | |
af8e2d1d | 1496 | } |
33879d45 | 1497 | |
b5d67f64 SB |
1498 | bio_put(bio); |
1499 | } | |
96e36920 | 1500 | |
b5d67f64 | 1501 | if (sblock->no_io_error_seen) |
ba7cf988 | 1502 | scrub_recheck_block_checksum(sblock); |
a2de733c AJ |
1503 | } |
1504 | ||
17a9be2f MX |
1505 | static inline int scrub_check_fsid(u8 fsid[], |
1506 | struct scrub_page *spage) | |
1507 | { | |
1508 | struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices; | |
1509 | int ret; | |
1510 | ||
44880fdc | 1511 | ret = memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE); |
17a9be2f MX |
1512 | return !ret; |
1513 | } | |
1514 | ||
ba7cf988 | 1515 | static void scrub_recheck_block_checksum(struct scrub_block *sblock) |
a2de733c | 1516 | { |
ba7cf988 ZL |
1517 | sblock->header_error = 0; |
1518 | sblock->checksum_error = 0; | |
1519 | sblock->generation_error = 0; | |
b5d67f64 | 1520 | |
ba7cf988 ZL |
1521 | if (sblock->pagev[0]->flags & BTRFS_EXTENT_FLAG_DATA) |
1522 | scrub_checksum_data(sblock); | |
1523 | else | |
1524 | scrub_checksum_tree_block(sblock); | |
a2de733c AJ |
1525 | } |
1526 | ||
b5d67f64 | 1527 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
114ab50d | 1528 | struct scrub_block *sblock_good) |
b5d67f64 SB |
1529 | { |
1530 | int page_num; | |
1531 | int ret = 0; | |
96e36920 | 1532 | |
b5d67f64 SB |
1533 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
1534 | int ret_sub; | |
96e36920 | 1535 | |
b5d67f64 SB |
1536 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
1537 | sblock_good, | |
114ab50d | 1538 | page_num, 1); |
b5d67f64 SB |
1539 | if (ret_sub) |
1540 | ret = ret_sub; | |
a2de733c | 1541 | } |
b5d67f64 SB |
1542 | |
1543 | return ret; | |
1544 | } | |
1545 | ||
1546 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
1547 | struct scrub_block *sblock_good, | |
1548 | int page_num, int force_write) | |
1549 | { | |
7a9e9987 SB |
1550 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
1551 | struct scrub_page *page_good = sblock_good->pagev[page_num]; | |
0b246afa | 1552 | struct btrfs_fs_info *fs_info = sblock_bad->sctx->fs_info; |
b5d67f64 | 1553 | |
7a9e9987 SB |
1554 | BUG_ON(page_bad->page == NULL); |
1555 | BUG_ON(page_good->page == NULL); | |
b5d67f64 SB |
1556 | if (force_write || sblock_bad->header_error || |
1557 | sblock_bad->checksum_error || page_bad->io_error) { | |
1558 | struct bio *bio; | |
1559 | int ret; | |
b5d67f64 | 1560 | |
ff023aac | 1561 | if (!page_bad->dev->bdev) { |
0b246afa | 1562 | btrfs_warn_rl(fs_info, |
5d163e0e | 1563 | "scrub_repair_page_from_good_copy(bdev == NULL) is unexpected"); |
ff023aac SB |
1564 | return -EIO; |
1565 | } | |
1566 | ||
c5e4c3d7 | 1567 | bio = btrfs_io_bio_alloc(1); |
74d46992 | 1568 | bio_set_dev(bio, page_bad->dev->bdev); |
4f024f37 | 1569 | bio->bi_iter.bi_sector = page_bad->physical >> 9; |
ebcc3263 | 1570 | bio->bi_opf = REQ_OP_WRITE; |
b5d67f64 SB |
1571 | |
1572 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); | |
1573 | if (PAGE_SIZE != ret) { | |
1574 | bio_put(bio); | |
1575 | return -EIO; | |
13db62b7 | 1576 | } |
b5d67f64 | 1577 | |
4e49ea4a | 1578 | if (btrfsic_submit_bio_wait(bio)) { |
442a4f63 SB |
1579 | btrfs_dev_stat_inc_and_print(page_bad->dev, |
1580 | BTRFS_DEV_STAT_WRITE_ERRS); | |
e37abe97 | 1581 | atomic64_inc(&fs_info->dev_replace.num_write_errors); |
442a4f63 SB |
1582 | bio_put(bio); |
1583 | return -EIO; | |
1584 | } | |
b5d67f64 | 1585 | bio_put(bio); |
a2de733c AJ |
1586 | } |
1587 | ||
b5d67f64 SB |
1588 | return 0; |
1589 | } | |
1590 | ||
ff023aac SB |
1591 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
1592 | { | |
0b246afa | 1593 | struct btrfs_fs_info *fs_info = sblock->sctx->fs_info; |
ff023aac SB |
1594 | int page_num; |
1595 | ||
5a6ac9ea MX |
1596 | /* |
1597 | * This block is used for the check of the parity on the source device, | |
1598 | * so the data needn't be written into the destination device. | |
1599 | */ | |
1600 | if (sblock->sparity) | |
1601 | return; | |
1602 | ||
ff023aac SB |
1603 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1604 | int ret; | |
1605 | ||
1606 | ret = scrub_write_page_to_dev_replace(sblock, page_num); | |
1607 | if (ret) | |
e37abe97 | 1608 | atomic64_inc(&fs_info->dev_replace.num_write_errors); |
ff023aac SB |
1609 | } |
1610 | } | |
1611 | ||
1612 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
1613 | int page_num) | |
1614 | { | |
1615 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1616 | ||
1617 | BUG_ON(spage->page == NULL); | |
1618 | if (spage->io_error) { | |
1619 | void *mapped_buffer = kmap_atomic(spage->page); | |
1620 | ||
619a9742 | 1621 | clear_page(mapped_buffer); |
ff023aac SB |
1622 | flush_dcache_page(spage->page); |
1623 | kunmap_atomic(mapped_buffer); | |
1624 | } | |
1625 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); | |
1626 | } | |
1627 | ||
1628 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
1629 | struct scrub_page *spage) | |
1630 | { | |
ff023aac SB |
1631 | struct scrub_bio *sbio; |
1632 | int ret; | |
1633 | ||
3fb99303 | 1634 | mutex_lock(&sctx->wr_lock); |
ff023aac | 1635 | again: |
3fb99303 DS |
1636 | if (!sctx->wr_curr_bio) { |
1637 | sctx->wr_curr_bio = kzalloc(sizeof(*sctx->wr_curr_bio), | |
58c4e173 | 1638 | GFP_KERNEL); |
3fb99303 DS |
1639 | if (!sctx->wr_curr_bio) { |
1640 | mutex_unlock(&sctx->wr_lock); | |
ff023aac SB |
1641 | return -ENOMEM; |
1642 | } | |
3fb99303 DS |
1643 | sctx->wr_curr_bio->sctx = sctx; |
1644 | sctx->wr_curr_bio->page_count = 0; | |
ff023aac | 1645 | } |
3fb99303 | 1646 | sbio = sctx->wr_curr_bio; |
ff023aac SB |
1647 | if (sbio->page_count == 0) { |
1648 | struct bio *bio; | |
1649 | ||
1650 | sbio->physical = spage->physical_for_dev_replace; | |
1651 | sbio->logical = spage->logical; | |
3fb99303 | 1652 | sbio->dev = sctx->wr_tgtdev; |
ff023aac SB |
1653 | bio = sbio->bio; |
1654 | if (!bio) { | |
c5e4c3d7 | 1655 | bio = btrfs_io_bio_alloc(sctx->pages_per_wr_bio); |
ff023aac SB |
1656 | sbio->bio = bio; |
1657 | } | |
1658 | ||
1659 | bio->bi_private = sbio; | |
1660 | bio->bi_end_io = scrub_wr_bio_end_io; | |
74d46992 | 1661 | bio_set_dev(bio, sbio->dev->bdev); |
4f024f37 | 1662 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
ebcc3263 | 1663 | bio->bi_opf = REQ_OP_WRITE; |
4e4cbee9 | 1664 | sbio->status = 0; |
ff023aac SB |
1665 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
1666 | spage->physical_for_dev_replace || | |
1667 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
1668 | spage->logical) { | |
1669 | scrub_wr_submit(sctx); | |
1670 | goto again; | |
1671 | } | |
1672 | ||
1673 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1674 | if (ret != PAGE_SIZE) { | |
1675 | if (sbio->page_count < 1) { | |
1676 | bio_put(sbio->bio); | |
1677 | sbio->bio = NULL; | |
3fb99303 | 1678 | mutex_unlock(&sctx->wr_lock); |
ff023aac SB |
1679 | return -EIO; |
1680 | } | |
1681 | scrub_wr_submit(sctx); | |
1682 | goto again; | |
1683 | } | |
1684 | ||
1685 | sbio->pagev[sbio->page_count] = spage; | |
1686 | scrub_page_get(spage); | |
1687 | sbio->page_count++; | |
3fb99303 | 1688 | if (sbio->page_count == sctx->pages_per_wr_bio) |
ff023aac | 1689 | scrub_wr_submit(sctx); |
3fb99303 | 1690 | mutex_unlock(&sctx->wr_lock); |
ff023aac SB |
1691 | |
1692 | return 0; | |
1693 | } | |
1694 | ||
1695 | static void scrub_wr_submit(struct scrub_ctx *sctx) | |
1696 | { | |
ff023aac SB |
1697 | struct scrub_bio *sbio; |
1698 | ||
3fb99303 | 1699 | if (!sctx->wr_curr_bio) |
ff023aac SB |
1700 | return; |
1701 | ||
3fb99303 DS |
1702 | sbio = sctx->wr_curr_bio; |
1703 | sctx->wr_curr_bio = NULL; | |
74d46992 | 1704 | WARN_ON(!sbio->bio->bi_disk); |
ff023aac SB |
1705 | scrub_pending_bio_inc(sctx); |
1706 | /* process all writes in a single worker thread. Then the block layer | |
1707 | * orders the requests before sending them to the driver which | |
1708 | * doubled the write performance on spinning disks when measured | |
1709 | * with Linux 3.5 */ | |
4e49ea4a | 1710 | btrfsic_submit_bio(sbio->bio); |
ff023aac SB |
1711 | } |
1712 | ||
4246a0b6 | 1713 | static void scrub_wr_bio_end_io(struct bio *bio) |
ff023aac SB |
1714 | { |
1715 | struct scrub_bio *sbio = bio->bi_private; | |
fb456252 | 1716 | struct btrfs_fs_info *fs_info = sbio->dev->fs_info; |
ff023aac | 1717 | |
4e4cbee9 | 1718 | sbio->status = bio->bi_status; |
ff023aac SB |
1719 | sbio->bio = bio; |
1720 | ||
9e0af237 LB |
1721 | btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper, |
1722 | scrub_wr_bio_end_io_worker, NULL, NULL); | |
0339ef2f | 1723 | btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work); |
ff023aac SB |
1724 | } |
1725 | ||
1726 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) | |
1727 | { | |
1728 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
1729 | struct scrub_ctx *sctx = sbio->sctx; | |
1730 | int i; | |
1731 | ||
1732 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); | |
4e4cbee9 | 1733 | if (sbio->status) { |
ff023aac | 1734 | struct btrfs_dev_replace *dev_replace = |
fb456252 | 1735 | &sbio->sctx->fs_info->dev_replace; |
ff023aac SB |
1736 | |
1737 | for (i = 0; i < sbio->page_count; i++) { | |
1738 | struct scrub_page *spage = sbio->pagev[i]; | |
1739 | ||
1740 | spage->io_error = 1; | |
e37abe97 | 1741 | atomic64_inc(&dev_replace->num_write_errors); |
ff023aac SB |
1742 | } |
1743 | } | |
1744 | ||
1745 | for (i = 0; i < sbio->page_count; i++) | |
1746 | scrub_page_put(sbio->pagev[i]); | |
1747 | ||
1748 | bio_put(sbio->bio); | |
1749 | kfree(sbio); | |
1750 | scrub_pending_bio_dec(sctx); | |
1751 | } | |
1752 | ||
1753 | static int scrub_checksum(struct scrub_block *sblock) | |
b5d67f64 SB |
1754 | { |
1755 | u64 flags; | |
1756 | int ret; | |
1757 | ||
ba7cf988 ZL |
1758 | /* |
1759 | * No need to initialize these stats currently, | |
1760 | * because this function only use return value | |
1761 | * instead of these stats value. | |
1762 | * | |
1763 | * Todo: | |
1764 | * always use stats | |
1765 | */ | |
1766 | sblock->header_error = 0; | |
1767 | sblock->generation_error = 0; | |
1768 | sblock->checksum_error = 0; | |
1769 | ||
7a9e9987 SB |
1770 | WARN_ON(sblock->page_count < 1); |
1771 | flags = sblock->pagev[0]->flags; | |
b5d67f64 SB |
1772 | ret = 0; |
1773 | if (flags & BTRFS_EXTENT_FLAG_DATA) | |
1774 | ret = scrub_checksum_data(sblock); | |
1775 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) | |
1776 | ret = scrub_checksum_tree_block(sblock); | |
1777 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
1778 | (void)scrub_checksum_super(sblock); | |
1779 | else | |
1780 | WARN_ON(1); | |
1781 | if (ret) | |
1782 | scrub_handle_errored_block(sblock); | |
ff023aac SB |
1783 | |
1784 | return ret; | |
a2de733c AJ |
1785 | } |
1786 | ||
b5d67f64 | 1787 | static int scrub_checksum_data(struct scrub_block *sblock) |
a2de733c | 1788 | { |
d9d181c1 | 1789 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1790 | u8 csum[BTRFS_CSUM_SIZE]; |
b5d67f64 SB |
1791 | u8 *on_disk_csum; |
1792 | struct page *page; | |
1793 | void *buffer; | |
a2de733c | 1794 | u32 crc = ~(u32)0; |
b5d67f64 SB |
1795 | u64 len; |
1796 | int index; | |
a2de733c | 1797 | |
b5d67f64 | 1798 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1799 | if (!sblock->pagev[0]->have_csum) |
a2de733c AJ |
1800 | return 0; |
1801 | ||
7a9e9987 SB |
1802 | on_disk_csum = sblock->pagev[0]->csum; |
1803 | page = sblock->pagev[0]->page; | |
9613bebb | 1804 | buffer = kmap_atomic(page); |
b5d67f64 | 1805 | |
25cc1226 | 1806 | len = sctx->fs_info->sectorsize; |
b5d67f64 SB |
1807 | index = 0; |
1808 | for (;;) { | |
1809 | u64 l = min_t(u64, len, PAGE_SIZE); | |
1810 | ||
b0496686 | 1811 | crc = btrfs_csum_data(buffer, crc, l); |
9613bebb | 1812 | kunmap_atomic(buffer); |
b5d67f64 SB |
1813 | len -= l; |
1814 | if (len == 0) | |
1815 | break; | |
1816 | index++; | |
1817 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1818 | BUG_ON(!sblock->pagev[index]->page); |
1819 | page = sblock->pagev[index]->page; | |
9613bebb | 1820 | buffer = kmap_atomic(page); |
b5d67f64 SB |
1821 | } |
1822 | ||
a2de733c | 1823 | btrfs_csum_final(crc, csum); |
d9d181c1 | 1824 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
ba7cf988 | 1825 | sblock->checksum_error = 1; |
a2de733c | 1826 | |
ba7cf988 | 1827 | return sblock->checksum_error; |
a2de733c AJ |
1828 | } |
1829 | ||
b5d67f64 | 1830 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
a2de733c | 1831 | { |
d9d181c1 | 1832 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1833 | struct btrfs_header *h; |
0b246afa | 1834 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
b5d67f64 SB |
1835 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1836 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1837 | struct page *page; | |
1838 | void *mapped_buffer; | |
1839 | u64 mapped_size; | |
1840 | void *p; | |
a2de733c | 1841 | u32 crc = ~(u32)0; |
b5d67f64 SB |
1842 | u64 len; |
1843 | int index; | |
1844 | ||
1845 | BUG_ON(sblock->page_count < 1); | |
7a9e9987 | 1846 | page = sblock->pagev[0]->page; |
9613bebb | 1847 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1848 | h = (struct btrfs_header *)mapped_buffer; |
d9d181c1 | 1849 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
a2de733c AJ |
1850 | |
1851 | /* | |
1852 | * we don't use the getter functions here, as we | |
1853 | * a) don't have an extent buffer and | |
1854 | * b) the page is already kmapped | |
1855 | */ | |
3cae210f | 1856 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h)) |
ba7cf988 | 1857 | sblock->header_error = 1; |
a2de733c | 1858 | |
ba7cf988 ZL |
1859 | if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h)) { |
1860 | sblock->header_error = 1; | |
1861 | sblock->generation_error = 1; | |
1862 | } | |
a2de733c | 1863 | |
17a9be2f | 1864 | if (!scrub_check_fsid(h->fsid, sblock->pagev[0])) |
ba7cf988 | 1865 | sblock->header_error = 1; |
a2de733c AJ |
1866 | |
1867 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
1868 | BTRFS_UUID_SIZE)) | |
ba7cf988 | 1869 | sblock->header_error = 1; |
a2de733c | 1870 | |
25cc1226 | 1871 | len = sctx->fs_info->nodesize - BTRFS_CSUM_SIZE; |
b5d67f64 SB |
1872 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
1873 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1874 | index = 0; | |
1875 | for (;;) { | |
1876 | u64 l = min_t(u64, len, mapped_size); | |
1877 | ||
b0496686 | 1878 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 1879 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1880 | len -= l; |
1881 | if (len == 0) | |
1882 | break; | |
1883 | index++; | |
1884 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1885 | BUG_ON(!sblock->pagev[index]->page); |
1886 | page = sblock->pagev[index]->page; | |
9613bebb | 1887 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1888 | mapped_size = PAGE_SIZE; |
1889 | p = mapped_buffer; | |
1890 | } | |
1891 | ||
1892 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1893 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
ba7cf988 | 1894 | sblock->checksum_error = 1; |
a2de733c | 1895 | |
ba7cf988 | 1896 | return sblock->header_error || sblock->checksum_error; |
a2de733c AJ |
1897 | } |
1898 | ||
b5d67f64 | 1899 | static int scrub_checksum_super(struct scrub_block *sblock) |
a2de733c AJ |
1900 | { |
1901 | struct btrfs_super_block *s; | |
d9d181c1 | 1902 | struct scrub_ctx *sctx = sblock->sctx; |
b5d67f64 SB |
1903 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1904 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1905 | struct page *page; | |
1906 | void *mapped_buffer; | |
1907 | u64 mapped_size; | |
1908 | void *p; | |
a2de733c | 1909 | u32 crc = ~(u32)0; |
442a4f63 SB |
1910 | int fail_gen = 0; |
1911 | int fail_cor = 0; | |
b5d67f64 SB |
1912 | u64 len; |
1913 | int index; | |
a2de733c | 1914 | |
b5d67f64 | 1915 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1916 | page = sblock->pagev[0]->page; |
9613bebb | 1917 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1918 | s = (struct btrfs_super_block *)mapped_buffer; |
d9d181c1 | 1919 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
a2de733c | 1920 | |
3cae210f | 1921 | if (sblock->pagev[0]->logical != btrfs_super_bytenr(s)) |
442a4f63 | 1922 | ++fail_cor; |
a2de733c | 1923 | |
3cae210f | 1924 | if (sblock->pagev[0]->generation != btrfs_super_generation(s)) |
442a4f63 | 1925 | ++fail_gen; |
a2de733c | 1926 | |
17a9be2f | 1927 | if (!scrub_check_fsid(s->fsid, sblock->pagev[0])) |
442a4f63 | 1928 | ++fail_cor; |
a2de733c | 1929 | |
b5d67f64 SB |
1930 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
1931 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; | |
1932 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1933 | index = 0; | |
1934 | for (;;) { | |
1935 | u64 l = min_t(u64, len, mapped_size); | |
1936 | ||
b0496686 | 1937 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 1938 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1939 | len -= l; |
1940 | if (len == 0) | |
1941 | break; | |
1942 | index++; | |
1943 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1944 | BUG_ON(!sblock->pagev[index]->page); |
1945 | page = sblock->pagev[index]->page; | |
9613bebb | 1946 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1947 | mapped_size = PAGE_SIZE; |
1948 | p = mapped_buffer; | |
1949 | } | |
1950 | ||
1951 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1952 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
442a4f63 | 1953 | ++fail_cor; |
a2de733c | 1954 | |
442a4f63 | 1955 | if (fail_cor + fail_gen) { |
a2de733c AJ |
1956 | /* |
1957 | * if we find an error in a super block, we just report it. | |
1958 | * They will get written with the next transaction commit | |
1959 | * anyway | |
1960 | */ | |
d9d181c1 SB |
1961 | spin_lock(&sctx->stat_lock); |
1962 | ++sctx->stat.super_errors; | |
1963 | spin_unlock(&sctx->stat_lock); | |
442a4f63 | 1964 | if (fail_cor) |
7a9e9987 | 1965 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 SB |
1966 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
1967 | else | |
7a9e9987 | 1968 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 | 1969 | BTRFS_DEV_STAT_GENERATION_ERRS); |
a2de733c AJ |
1970 | } |
1971 | ||
442a4f63 | 1972 | return fail_cor + fail_gen; |
a2de733c AJ |
1973 | } |
1974 | ||
b5d67f64 SB |
1975 | static void scrub_block_get(struct scrub_block *sblock) |
1976 | { | |
186debd6 | 1977 | refcount_inc(&sblock->refs); |
b5d67f64 SB |
1978 | } |
1979 | ||
1980 | static void scrub_block_put(struct scrub_block *sblock) | |
1981 | { | |
186debd6 | 1982 | if (refcount_dec_and_test(&sblock->refs)) { |
b5d67f64 SB |
1983 | int i; |
1984 | ||
5a6ac9ea MX |
1985 | if (sblock->sparity) |
1986 | scrub_parity_put(sblock->sparity); | |
1987 | ||
b5d67f64 | 1988 | for (i = 0; i < sblock->page_count; i++) |
7a9e9987 | 1989 | scrub_page_put(sblock->pagev[i]); |
b5d67f64 SB |
1990 | kfree(sblock); |
1991 | } | |
1992 | } | |
1993 | ||
7a9e9987 SB |
1994 | static void scrub_page_get(struct scrub_page *spage) |
1995 | { | |
57019345 | 1996 | atomic_inc(&spage->refs); |
7a9e9987 SB |
1997 | } |
1998 | ||
1999 | static void scrub_page_put(struct scrub_page *spage) | |
2000 | { | |
57019345 | 2001 | if (atomic_dec_and_test(&spage->refs)) { |
7a9e9987 SB |
2002 | if (spage->page) |
2003 | __free_page(spage->page); | |
2004 | kfree(spage); | |
2005 | } | |
2006 | } | |
2007 | ||
d9d181c1 | 2008 | static void scrub_submit(struct scrub_ctx *sctx) |
a2de733c AJ |
2009 | { |
2010 | struct scrub_bio *sbio; | |
2011 | ||
d9d181c1 | 2012 | if (sctx->curr == -1) |
1623edeb | 2013 | return; |
a2de733c | 2014 | |
d9d181c1 SB |
2015 | sbio = sctx->bios[sctx->curr]; |
2016 | sctx->curr = -1; | |
b6bfebc1 | 2017 | scrub_pending_bio_inc(sctx); |
4e49ea4a | 2018 | btrfsic_submit_bio(sbio->bio); |
a2de733c AJ |
2019 | } |
2020 | ||
ff023aac SB |
2021 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
2022 | struct scrub_page *spage) | |
a2de733c | 2023 | { |
b5d67f64 | 2024 | struct scrub_block *sblock = spage->sblock; |
a2de733c | 2025 | struct scrub_bio *sbio; |
69f4cb52 | 2026 | int ret; |
a2de733c AJ |
2027 | |
2028 | again: | |
2029 | /* | |
2030 | * grab a fresh bio or wait for one to become available | |
2031 | */ | |
d9d181c1 SB |
2032 | while (sctx->curr == -1) { |
2033 | spin_lock(&sctx->list_lock); | |
2034 | sctx->curr = sctx->first_free; | |
2035 | if (sctx->curr != -1) { | |
2036 | sctx->first_free = sctx->bios[sctx->curr]->next_free; | |
2037 | sctx->bios[sctx->curr]->next_free = -1; | |
2038 | sctx->bios[sctx->curr]->page_count = 0; | |
2039 | spin_unlock(&sctx->list_lock); | |
a2de733c | 2040 | } else { |
d9d181c1 SB |
2041 | spin_unlock(&sctx->list_lock); |
2042 | wait_event(sctx->list_wait, sctx->first_free != -1); | |
a2de733c AJ |
2043 | } |
2044 | } | |
d9d181c1 | 2045 | sbio = sctx->bios[sctx->curr]; |
b5d67f64 | 2046 | if (sbio->page_count == 0) { |
69f4cb52 AJ |
2047 | struct bio *bio; |
2048 | ||
b5d67f64 SB |
2049 | sbio->physical = spage->physical; |
2050 | sbio->logical = spage->logical; | |
a36cf8b8 | 2051 | sbio->dev = spage->dev; |
b5d67f64 SB |
2052 | bio = sbio->bio; |
2053 | if (!bio) { | |
c5e4c3d7 | 2054 | bio = btrfs_io_bio_alloc(sctx->pages_per_rd_bio); |
b5d67f64 SB |
2055 | sbio->bio = bio; |
2056 | } | |
69f4cb52 AJ |
2057 | |
2058 | bio->bi_private = sbio; | |
2059 | bio->bi_end_io = scrub_bio_end_io; | |
74d46992 | 2060 | bio_set_dev(bio, sbio->dev->bdev); |
4f024f37 | 2061 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
ebcc3263 | 2062 | bio->bi_opf = REQ_OP_READ; |
4e4cbee9 | 2063 | sbio->status = 0; |
b5d67f64 SB |
2064 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
2065 | spage->physical || | |
2066 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
a36cf8b8 SB |
2067 | spage->logical || |
2068 | sbio->dev != spage->dev) { | |
d9d181c1 | 2069 | scrub_submit(sctx); |
a2de733c AJ |
2070 | goto again; |
2071 | } | |
69f4cb52 | 2072 | |
b5d67f64 SB |
2073 | sbio->pagev[sbio->page_count] = spage; |
2074 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
2075 | if (ret != PAGE_SIZE) { | |
2076 | if (sbio->page_count < 1) { | |
2077 | bio_put(sbio->bio); | |
2078 | sbio->bio = NULL; | |
2079 | return -EIO; | |
2080 | } | |
d9d181c1 | 2081 | scrub_submit(sctx); |
69f4cb52 AJ |
2082 | goto again; |
2083 | } | |
2084 | ||
ff023aac | 2085 | scrub_block_get(sblock); /* one for the page added to the bio */ |
b5d67f64 SB |
2086 | atomic_inc(&sblock->outstanding_pages); |
2087 | sbio->page_count++; | |
ff023aac | 2088 | if (sbio->page_count == sctx->pages_per_rd_bio) |
d9d181c1 | 2089 | scrub_submit(sctx); |
b5d67f64 SB |
2090 | |
2091 | return 0; | |
2092 | } | |
2093 | ||
22365979 | 2094 | static void scrub_missing_raid56_end_io(struct bio *bio) |
73ff61db OS |
2095 | { |
2096 | struct scrub_block *sblock = bio->bi_private; | |
fb456252 | 2097 | struct btrfs_fs_info *fs_info = sblock->sctx->fs_info; |
73ff61db | 2098 | |
4e4cbee9 | 2099 | if (bio->bi_status) |
73ff61db OS |
2100 | sblock->no_io_error_seen = 0; |
2101 | ||
4673272f ST |
2102 | bio_put(bio); |
2103 | ||
73ff61db OS |
2104 | btrfs_queue_work(fs_info->scrub_workers, &sblock->work); |
2105 | } | |
2106 | ||
2107 | static void scrub_missing_raid56_worker(struct btrfs_work *work) | |
2108 | { | |
2109 | struct scrub_block *sblock = container_of(work, struct scrub_block, work); | |
2110 | struct scrub_ctx *sctx = sblock->sctx; | |
0b246afa | 2111 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
73ff61db OS |
2112 | u64 logical; |
2113 | struct btrfs_device *dev; | |
2114 | ||
73ff61db OS |
2115 | logical = sblock->pagev[0]->logical; |
2116 | dev = sblock->pagev[0]->dev; | |
2117 | ||
affe4a5a | 2118 | if (sblock->no_io_error_seen) |
ba7cf988 | 2119 | scrub_recheck_block_checksum(sblock); |
73ff61db OS |
2120 | |
2121 | if (!sblock->no_io_error_seen) { | |
2122 | spin_lock(&sctx->stat_lock); | |
2123 | sctx->stat.read_errors++; | |
2124 | spin_unlock(&sctx->stat_lock); | |
0b246afa | 2125 | btrfs_err_rl_in_rcu(fs_info, |
b14af3b4 | 2126 | "IO error rebuilding logical %llu for dev %s", |
73ff61db OS |
2127 | logical, rcu_str_deref(dev->name)); |
2128 | } else if (sblock->header_error || sblock->checksum_error) { | |
2129 | spin_lock(&sctx->stat_lock); | |
2130 | sctx->stat.uncorrectable_errors++; | |
2131 | spin_unlock(&sctx->stat_lock); | |
0b246afa | 2132 | btrfs_err_rl_in_rcu(fs_info, |
b14af3b4 | 2133 | "failed to rebuild valid logical %llu for dev %s", |
73ff61db OS |
2134 | logical, rcu_str_deref(dev->name)); |
2135 | } else { | |
2136 | scrub_write_block_to_dev_replace(sblock); | |
2137 | } | |
2138 | ||
2139 | scrub_block_put(sblock); | |
2140 | ||
2073c4c2 | 2141 | if (sctx->is_dev_replace && sctx->flush_all_writes) { |
3fb99303 | 2142 | mutex_lock(&sctx->wr_lock); |
73ff61db | 2143 | scrub_wr_submit(sctx); |
3fb99303 | 2144 | mutex_unlock(&sctx->wr_lock); |
73ff61db OS |
2145 | } |
2146 | ||
2147 | scrub_pending_bio_dec(sctx); | |
2148 | } | |
2149 | ||
2150 | static void scrub_missing_raid56_pages(struct scrub_block *sblock) | |
2151 | { | |
2152 | struct scrub_ctx *sctx = sblock->sctx; | |
fb456252 | 2153 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
73ff61db OS |
2154 | u64 length = sblock->page_count * PAGE_SIZE; |
2155 | u64 logical = sblock->pagev[0]->logical; | |
f1fee653 | 2156 | struct btrfs_bio *bbio = NULL; |
73ff61db OS |
2157 | struct bio *bio; |
2158 | struct btrfs_raid_bio *rbio; | |
2159 | int ret; | |
2160 | int i; | |
2161 | ||
ae6529c3 | 2162 | btrfs_bio_counter_inc_blocked(fs_info); |
cf8cddd3 | 2163 | ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical, |
825ad4c9 | 2164 | &length, &bbio); |
73ff61db OS |
2165 | if (ret || !bbio || !bbio->raid_map) |
2166 | goto bbio_out; | |
2167 | ||
2168 | if (WARN_ON(!sctx->is_dev_replace || | |
2169 | !(bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK))) { | |
2170 | /* | |
2171 | * We shouldn't be scrubbing a missing device. Even for dev | |
2172 | * replace, we should only get here for RAID 5/6. We either | |
2173 | * managed to mount something with no mirrors remaining or | |
2174 | * there's a bug in scrub_remap_extent()/btrfs_map_block(). | |
2175 | */ | |
2176 | goto bbio_out; | |
2177 | } | |
2178 | ||
c5e4c3d7 | 2179 | bio = btrfs_io_bio_alloc(0); |
73ff61db OS |
2180 | bio->bi_iter.bi_sector = logical >> 9; |
2181 | bio->bi_private = sblock; | |
2182 | bio->bi_end_io = scrub_missing_raid56_end_io; | |
2183 | ||
2ff7e61e | 2184 | rbio = raid56_alloc_missing_rbio(fs_info, bio, bbio, length); |
73ff61db OS |
2185 | if (!rbio) |
2186 | goto rbio_out; | |
2187 | ||
2188 | for (i = 0; i < sblock->page_count; i++) { | |
2189 | struct scrub_page *spage = sblock->pagev[i]; | |
2190 | ||
2191 | raid56_add_scrub_pages(rbio, spage->page, spage->logical); | |
2192 | } | |
2193 | ||
2194 | btrfs_init_work(&sblock->work, btrfs_scrub_helper, | |
2195 | scrub_missing_raid56_worker, NULL, NULL); | |
2196 | scrub_block_get(sblock); | |
2197 | scrub_pending_bio_inc(sctx); | |
2198 | raid56_submit_missing_rbio(rbio); | |
2199 | return; | |
2200 | ||
2201 | rbio_out: | |
2202 | bio_put(bio); | |
2203 | bbio_out: | |
ae6529c3 | 2204 | btrfs_bio_counter_dec(fs_info); |
73ff61db OS |
2205 | btrfs_put_bbio(bbio); |
2206 | spin_lock(&sctx->stat_lock); | |
2207 | sctx->stat.malloc_errors++; | |
2208 | spin_unlock(&sctx->stat_lock); | |
2209 | } | |
2210 | ||
d9d181c1 | 2211 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2212 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
2213 | u64 gen, int mirror_num, u8 *csum, int force, |
2214 | u64 physical_for_dev_replace) | |
b5d67f64 SB |
2215 | { |
2216 | struct scrub_block *sblock; | |
2217 | int index; | |
2218 | ||
58c4e173 | 2219 | sblock = kzalloc(sizeof(*sblock), GFP_KERNEL); |
b5d67f64 | 2220 | if (!sblock) { |
d9d181c1 SB |
2221 | spin_lock(&sctx->stat_lock); |
2222 | sctx->stat.malloc_errors++; | |
2223 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2224 | return -ENOMEM; |
a2de733c | 2225 | } |
b5d67f64 | 2226 | |
7a9e9987 SB |
2227 | /* one ref inside this function, plus one for each page added to |
2228 | * a bio later on */ | |
186debd6 | 2229 | refcount_set(&sblock->refs, 1); |
d9d181c1 | 2230 | sblock->sctx = sctx; |
b5d67f64 SB |
2231 | sblock->no_io_error_seen = 1; |
2232 | ||
2233 | for (index = 0; len > 0; index++) { | |
7a9e9987 | 2234 | struct scrub_page *spage; |
b5d67f64 SB |
2235 | u64 l = min_t(u64, len, PAGE_SIZE); |
2236 | ||
58c4e173 | 2237 | spage = kzalloc(sizeof(*spage), GFP_KERNEL); |
7a9e9987 SB |
2238 | if (!spage) { |
2239 | leave_nomem: | |
d9d181c1 SB |
2240 | spin_lock(&sctx->stat_lock); |
2241 | sctx->stat.malloc_errors++; | |
2242 | spin_unlock(&sctx->stat_lock); | |
7a9e9987 | 2243 | scrub_block_put(sblock); |
b5d67f64 SB |
2244 | return -ENOMEM; |
2245 | } | |
7a9e9987 SB |
2246 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
2247 | scrub_page_get(spage); | |
2248 | sblock->pagev[index] = spage; | |
b5d67f64 | 2249 | spage->sblock = sblock; |
a36cf8b8 | 2250 | spage->dev = dev; |
b5d67f64 SB |
2251 | spage->flags = flags; |
2252 | spage->generation = gen; | |
2253 | spage->logical = logical; | |
2254 | spage->physical = physical; | |
ff023aac | 2255 | spage->physical_for_dev_replace = physical_for_dev_replace; |
b5d67f64 SB |
2256 | spage->mirror_num = mirror_num; |
2257 | if (csum) { | |
2258 | spage->have_csum = 1; | |
d9d181c1 | 2259 | memcpy(spage->csum, csum, sctx->csum_size); |
b5d67f64 SB |
2260 | } else { |
2261 | spage->have_csum = 0; | |
2262 | } | |
2263 | sblock->page_count++; | |
58c4e173 | 2264 | spage->page = alloc_page(GFP_KERNEL); |
7a9e9987 SB |
2265 | if (!spage->page) |
2266 | goto leave_nomem; | |
b5d67f64 SB |
2267 | len -= l; |
2268 | logical += l; | |
2269 | physical += l; | |
ff023aac | 2270 | physical_for_dev_replace += l; |
b5d67f64 SB |
2271 | } |
2272 | ||
7a9e9987 | 2273 | WARN_ON(sblock->page_count == 0); |
e6e674bd | 2274 | if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) { |
73ff61db OS |
2275 | /* |
2276 | * This case should only be hit for RAID 5/6 device replace. See | |
2277 | * the comment in scrub_missing_raid56_pages() for details. | |
2278 | */ | |
2279 | scrub_missing_raid56_pages(sblock); | |
2280 | } else { | |
2281 | for (index = 0; index < sblock->page_count; index++) { | |
2282 | struct scrub_page *spage = sblock->pagev[index]; | |
2283 | int ret; | |
1bc87793 | 2284 | |
73ff61db OS |
2285 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
2286 | if (ret) { | |
2287 | scrub_block_put(sblock); | |
2288 | return ret; | |
2289 | } | |
b5d67f64 | 2290 | } |
a2de733c | 2291 | |
73ff61db OS |
2292 | if (force) |
2293 | scrub_submit(sctx); | |
2294 | } | |
a2de733c | 2295 | |
b5d67f64 SB |
2296 | /* last one frees, either here or in bio completion for last page */ |
2297 | scrub_block_put(sblock); | |
a2de733c AJ |
2298 | return 0; |
2299 | } | |
2300 | ||
4246a0b6 | 2301 | static void scrub_bio_end_io(struct bio *bio) |
b5d67f64 SB |
2302 | { |
2303 | struct scrub_bio *sbio = bio->bi_private; | |
fb456252 | 2304 | struct btrfs_fs_info *fs_info = sbio->dev->fs_info; |
b5d67f64 | 2305 | |
4e4cbee9 | 2306 | sbio->status = bio->bi_status; |
b5d67f64 SB |
2307 | sbio->bio = bio; |
2308 | ||
0339ef2f | 2309 | btrfs_queue_work(fs_info->scrub_workers, &sbio->work); |
b5d67f64 SB |
2310 | } |
2311 | ||
2312 | static void scrub_bio_end_io_worker(struct btrfs_work *work) | |
2313 | { | |
2314 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
d9d181c1 | 2315 | struct scrub_ctx *sctx = sbio->sctx; |
b5d67f64 SB |
2316 | int i; |
2317 | ||
ff023aac | 2318 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
4e4cbee9 | 2319 | if (sbio->status) { |
b5d67f64 SB |
2320 | for (i = 0; i < sbio->page_count; i++) { |
2321 | struct scrub_page *spage = sbio->pagev[i]; | |
2322 | ||
2323 | spage->io_error = 1; | |
2324 | spage->sblock->no_io_error_seen = 0; | |
2325 | } | |
2326 | } | |
2327 | ||
2328 | /* now complete the scrub_block items that have all pages completed */ | |
2329 | for (i = 0; i < sbio->page_count; i++) { | |
2330 | struct scrub_page *spage = sbio->pagev[i]; | |
2331 | struct scrub_block *sblock = spage->sblock; | |
2332 | ||
2333 | if (atomic_dec_and_test(&sblock->outstanding_pages)) | |
2334 | scrub_block_complete(sblock); | |
2335 | scrub_block_put(sblock); | |
2336 | } | |
2337 | ||
b5d67f64 SB |
2338 | bio_put(sbio->bio); |
2339 | sbio->bio = NULL; | |
d9d181c1 SB |
2340 | spin_lock(&sctx->list_lock); |
2341 | sbio->next_free = sctx->first_free; | |
2342 | sctx->first_free = sbio->index; | |
2343 | spin_unlock(&sctx->list_lock); | |
ff023aac | 2344 | |
2073c4c2 | 2345 | if (sctx->is_dev_replace && sctx->flush_all_writes) { |
3fb99303 | 2346 | mutex_lock(&sctx->wr_lock); |
ff023aac | 2347 | scrub_wr_submit(sctx); |
3fb99303 | 2348 | mutex_unlock(&sctx->wr_lock); |
ff023aac SB |
2349 | } |
2350 | ||
b6bfebc1 | 2351 | scrub_pending_bio_dec(sctx); |
b5d67f64 SB |
2352 | } |
2353 | ||
5a6ac9ea MX |
2354 | static inline void __scrub_mark_bitmap(struct scrub_parity *sparity, |
2355 | unsigned long *bitmap, | |
2356 | u64 start, u64 len) | |
2357 | { | |
972d7219 | 2358 | u64 offset; |
7736b0a4 DS |
2359 | u64 nsectors64; |
2360 | u32 nsectors; | |
da17066c | 2361 | int sectorsize = sparity->sctx->fs_info->sectorsize; |
5a6ac9ea MX |
2362 | |
2363 | if (len >= sparity->stripe_len) { | |
2364 | bitmap_set(bitmap, 0, sparity->nsectors); | |
2365 | return; | |
2366 | } | |
2367 | ||
2368 | start -= sparity->logic_start; | |
972d7219 LB |
2369 | start = div64_u64_rem(start, sparity->stripe_len, &offset); |
2370 | offset = div_u64(offset, sectorsize); | |
7736b0a4 DS |
2371 | nsectors64 = div_u64(len, sectorsize); |
2372 | ||
2373 | ASSERT(nsectors64 < UINT_MAX); | |
2374 | nsectors = (u32)nsectors64; | |
5a6ac9ea MX |
2375 | |
2376 | if (offset + nsectors <= sparity->nsectors) { | |
2377 | bitmap_set(bitmap, offset, nsectors); | |
2378 | return; | |
2379 | } | |
2380 | ||
2381 | bitmap_set(bitmap, offset, sparity->nsectors - offset); | |
2382 | bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset)); | |
2383 | } | |
2384 | ||
2385 | static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity, | |
2386 | u64 start, u64 len) | |
2387 | { | |
2388 | __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len); | |
2389 | } | |
2390 | ||
2391 | static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity, | |
2392 | u64 start, u64 len) | |
2393 | { | |
2394 | __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len); | |
2395 | } | |
2396 | ||
b5d67f64 SB |
2397 | static void scrub_block_complete(struct scrub_block *sblock) |
2398 | { | |
5a6ac9ea MX |
2399 | int corrupted = 0; |
2400 | ||
ff023aac | 2401 | if (!sblock->no_io_error_seen) { |
5a6ac9ea | 2402 | corrupted = 1; |
b5d67f64 | 2403 | scrub_handle_errored_block(sblock); |
ff023aac SB |
2404 | } else { |
2405 | /* | |
2406 | * if has checksum error, write via repair mechanism in | |
2407 | * dev replace case, otherwise write here in dev replace | |
2408 | * case. | |
2409 | */ | |
5a6ac9ea MX |
2410 | corrupted = scrub_checksum(sblock); |
2411 | if (!corrupted && sblock->sctx->is_dev_replace) | |
ff023aac SB |
2412 | scrub_write_block_to_dev_replace(sblock); |
2413 | } | |
5a6ac9ea MX |
2414 | |
2415 | if (sblock->sparity && corrupted && !sblock->data_corrected) { | |
2416 | u64 start = sblock->pagev[0]->logical; | |
2417 | u64 end = sblock->pagev[sblock->page_count - 1]->logical + | |
2418 | PAGE_SIZE; | |
2419 | ||
2420 | scrub_parity_mark_sectors_error(sblock->sparity, | |
2421 | start, end - start); | |
2422 | } | |
b5d67f64 SB |
2423 | } |
2424 | ||
3b5753ec | 2425 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u8 *csum) |
a2de733c AJ |
2426 | { |
2427 | struct btrfs_ordered_sum *sum = NULL; | |
f51a4a18 | 2428 | unsigned long index; |
a2de733c | 2429 | unsigned long num_sectors; |
a2de733c | 2430 | |
d9d181c1 SB |
2431 | while (!list_empty(&sctx->csum_list)) { |
2432 | sum = list_first_entry(&sctx->csum_list, | |
a2de733c AJ |
2433 | struct btrfs_ordered_sum, list); |
2434 | if (sum->bytenr > logical) | |
2435 | return 0; | |
2436 | if (sum->bytenr + sum->len > logical) | |
2437 | break; | |
2438 | ||
d9d181c1 | 2439 | ++sctx->stat.csum_discards; |
a2de733c AJ |
2440 | list_del(&sum->list); |
2441 | kfree(sum); | |
2442 | sum = NULL; | |
2443 | } | |
2444 | if (!sum) | |
2445 | return 0; | |
2446 | ||
1d1bf92d DS |
2447 | index = div_u64(logical - sum->bytenr, sctx->fs_info->sectorsize); |
2448 | ASSERT(index < UINT_MAX); | |
2449 | ||
25cc1226 | 2450 | num_sectors = sum->len / sctx->fs_info->sectorsize; |
f51a4a18 MX |
2451 | memcpy(csum, sum->sums + index, sctx->csum_size); |
2452 | if (index == num_sectors - 1) { | |
a2de733c AJ |
2453 | list_del(&sum->list); |
2454 | kfree(sum); | |
2455 | } | |
f51a4a18 | 2456 | return 1; |
a2de733c AJ |
2457 | } |
2458 | ||
2459 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
6ca1765b LB |
2460 | static int scrub_extent(struct scrub_ctx *sctx, struct map_lookup *map, |
2461 | u64 logical, u64 len, | |
a36cf8b8 | 2462 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac | 2463 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
a2de733c AJ |
2464 | { |
2465 | int ret; | |
2466 | u8 csum[BTRFS_CSUM_SIZE]; | |
b5d67f64 SB |
2467 | u32 blocksize; |
2468 | ||
2469 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
6ca1765b LB |
2470 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) |
2471 | blocksize = map->stripe_len; | |
2472 | else | |
2473 | blocksize = sctx->fs_info->sectorsize; | |
d9d181c1 SB |
2474 | spin_lock(&sctx->stat_lock); |
2475 | sctx->stat.data_extents_scrubbed++; | |
2476 | sctx->stat.data_bytes_scrubbed += len; | |
2477 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2478 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
6ca1765b LB |
2479 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) |
2480 | blocksize = map->stripe_len; | |
2481 | else | |
2482 | blocksize = sctx->fs_info->nodesize; | |
d9d181c1 SB |
2483 | spin_lock(&sctx->stat_lock); |
2484 | sctx->stat.tree_extents_scrubbed++; | |
2485 | sctx->stat.tree_bytes_scrubbed += len; | |
2486 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2487 | } else { |
25cc1226 | 2488 | blocksize = sctx->fs_info->sectorsize; |
ff023aac | 2489 | WARN_ON(1); |
b5d67f64 | 2490 | } |
a2de733c AJ |
2491 | |
2492 | while (len) { | |
b5d67f64 | 2493 | u64 l = min_t(u64, len, blocksize); |
a2de733c AJ |
2494 | int have_csum = 0; |
2495 | ||
2496 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2497 | /* push csums to sbio */ | |
3b5753ec | 2498 | have_csum = scrub_find_csum(sctx, logical, csum); |
a2de733c | 2499 | if (have_csum == 0) |
d9d181c1 | 2500 | ++sctx->stat.no_csum; |
a2de733c | 2501 | } |
a36cf8b8 | 2502 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
ff023aac SB |
2503 | mirror_num, have_csum ? csum : NULL, 0, |
2504 | physical_for_dev_replace); | |
a2de733c AJ |
2505 | if (ret) |
2506 | return ret; | |
2507 | len -= l; | |
2508 | logical += l; | |
2509 | physical += l; | |
ff023aac | 2510 | physical_for_dev_replace += l; |
a2de733c AJ |
2511 | } |
2512 | return 0; | |
2513 | } | |
2514 | ||
5a6ac9ea MX |
2515 | static int scrub_pages_for_parity(struct scrub_parity *sparity, |
2516 | u64 logical, u64 len, | |
2517 | u64 physical, struct btrfs_device *dev, | |
2518 | u64 flags, u64 gen, int mirror_num, u8 *csum) | |
2519 | { | |
2520 | struct scrub_ctx *sctx = sparity->sctx; | |
2521 | struct scrub_block *sblock; | |
2522 | int index; | |
2523 | ||
58c4e173 | 2524 | sblock = kzalloc(sizeof(*sblock), GFP_KERNEL); |
5a6ac9ea MX |
2525 | if (!sblock) { |
2526 | spin_lock(&sctx->stat_lock); | |
2527 | sctx->stat.malloc_errors++; | |
2528 | spin_unlock(&sctx->stat_lock); | |
2529 | return -ENOMEM; | |
2530 | } | |
2531 | ||
2532 | /* one ref inside this function, plus one for each page added to | |
2533 | * a bio later on */ | |
186debd6 | 2534 | refcount_set(&sblock->refs, 1); |
5a6ac9ea MX |
2535 | sblock->sctx = sctx; |
2536 | sblock->no_io_error_seen = 1; | |
2537 | sblock->sparity = sparity; | |
2538 | scrub_parity_get(sparity); | |
2539 | ||
2540 | for (index = 0; len > 0; index++) { | |
2541 | struct scrub_page *spage; | |
2542 | u64 l = min_t(u64, len, PAGE_SIZE); | |
2543 | ||
58c4e173 | 2544 | spage = kzalloc(sizeof(*spage), GFP_KERNEL); |
5a6ac9ea MX |
2545 | if (!spage) { |
2546 | leave_nomem: | |
2547 | spin_lock(&sctx->stat_lock); | |
2548 | sctx->stat.malloc_errors++; | |
2549 | spin_unlock(&sctx->stat_lock); | |
2550 | scrub_block_put(sblock); | |
2551 | return -ENOMEM; | |
2552 | } | |
2553 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); | |
2554 | /* For scrub block */ | |
2555 | scrub_page_get(spage); | |
2556 | sblock->pagev[index] = spage; | |
2557 | /* For scrub parity */ | |
2558 | scrub_page_get(spage); | |
2559 | list_add_tail(&spage->list, &sparity->spages); | |
2560 | spage->sblock = sblock; | |
2561 | spage->dev = dev; | |
2562 | spage->flags = flags; | |
2563 | spage->generation = gen; | |
2564 | spage->logical = logical; | |
2565 | spage->physical = physical; | |
2566 | spage->mirror_num = mirror_num; | |
2567 | if (csum) { | |
2568 | spage->have_csum = 1; | |
2569 | memcpy(spage->csum, csum, sctx->csum_size); | |
2570 | } else { | |
2571 | spage->have_csum = 0; | |
2572 | } | |
2573 | sblock->page_count++; | |
58c4e173 | 2574 | spage->page = alloc_page(GFP_KERNEL); |
5a6ac9ea MX |
2575 | if (!spage->page) |
2576 | goto leave_nomem; | |
2577 | len -= l; | |
2578 | logical += l; | |
2579 | physical += l; | |
2580 | } | |
2581 | ||
2582 | WARN_ON(sblock->page_count == 0); | |
2583 | for (index = 0; index < sblock->page_count; index++) { | |
2584 | struct scrub_page *spage = sblock->pagev[index]; | |
2585 | int ret; | |
2586 | ||
2587 | ret = scrub_add_page_to_rd_bio(sctx, spage); | |
2588 | if (ret) { | |
2589 | scrub_block_put(sblock); | |
2590 | return ret; | |
2591 | } | |
2592 | } | |
2593 | ||
2594 | /* last one frees, either here or in bio completion for last page */ | |
2595 | scrub_block_put(sblock); | |
2596 | return 0; | |
2597 | } | |
2598 | ||
2599 | static int scrub_extent_for_parity(struct scrub_parity *sparity, | |
2600 | u64 logical, u64 len, | |
2601 | u64 physical, struct btrfs_device *dev, | |
2602 | u64 flags, u64 gen, int mirror_num) | |
2603 | { | |
2604 | struct scrub_ctx *sctx = sparity->sctx; | |
2605 | int ret; | |
2606 | u8 csum[BTRFS_CSUM_SIZE]; | |
2607 | u32 blocksize; | |
2608 | ||
e6e674bd | 2609 | if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) { |
4a770891 OS |
2610 | scrub_parity_mark_sectors_error(sparity, logical, len); |
2611 | return 0; | |
2612 | } | |
2613 | ||
5a6ac9ea | 2614 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
6ca1765b | 2615 | blocksize = sparity->stripe_len; |
5a6ac9ea | 2616 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
6ca1765b | 2617 | blocksize = sparity->stripe_len; |
5a6ac9ea | 2618 | } else { |
25cc1226 | 2619 | blocksize = sctx->fs_info->sectorsize; |
5a6ac9ea MX |
2620 | WARN_ON(1); |
2621 | } | |
2622 | ||
2623 | while (len) { | |
2624 | u64 l = min_t(u64, len, blocksize); | |
2625 | int have_csum = 0; | |
2626 | ||
2627 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2628 | /* push csums to sbio */ | |
3b5753ec | 2629 | have_csum = scrub_find_csum(sctx, logical, csum); |
5a6ac9ea MX |
2630 | if (have_csum == 0) |
2631 | goto skip; | |
2632 | } | |
2633 | ret = scrub_pages_for_parity(sparity, logical, l, physical, dev, | |
2634 | flags, gen, mirror_num, | |
2635 | have_csum ? csum : NULL); | |
5a6ac9ea MX |
2636 | if (ret) |
2637 | return ret; | |
6b6d24b3 | 2638 | skip: |
5a6ac9ea MX |
2639 | len -= l; |
2640 | logical += l; | |
2641 | physical += l; | |
2642 | } | |
2643 | return 0; | |
2644 | } | |
2645 | ||
3b080b25 WS |
2646 | /* |
2647 | * Given a physical address, this will calculate it's | |
2648 | * logical offset. if this is a parity stripe, it will return | |
2649 | * the most left data stripe's logical offset. | |
2650 | * | |
2651 | * return 0 if it is a data stripe, 1 means parity stripe. | |
2652 | */ | |
2653 | static int get_raid56_logic_offset(u64 physical, int num, | |
5a6ac9ea MX |
2654 | struct map_lookup *map, u64 *offset, |
2655 | u64 *stripe_start) | |
3b080b25 WS |
2656 | { |
2657 | int i; | |
2658 | int j = 0; | |
2659 | u64 stripe_nr; | |
2660 | u64 last_offset; | |
9d644a62 DS |
2661 | u32 stripe_index; |
2662 | u32 rot; | |
3b080b25 WS |
2663 | |
2664 | last_offset = (physical - map->stripes[num].physical) * | |
2665 | nr_data_stripes(map); | |
5a6ac9ea MX |
2666 | if (stripe_start) |
2667 | *stripe_start = last_offset; | |
2668 | ||
3b080b25 WS |
2669 | *offset = last_offset; |
2670 | for (i = 0; i < nr_data_stripes(map); i++) { | |
2671 | *offset = last_offset + i * map->stripe_len; | |
2672 | ||
42c61ab6 | 2673 | stripe_nr = div64_u64(*offset, map->stripe_len); |
b8b93add | 2674 | stripe_nr = div_u64(stripe_nr, nr_data_stripes(map)); |
3b080b25 WS |
2675 | |
2676 | /* Work out the disk rotation on this stripe-set */ | |
47c5713f | 2677 | stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot); |
3b080b25 WS |
2678 | /* calculate which stripe this data locates */ |
2679 | rot += i; | |
e4fbaee2 | 2680 | stripe_index = rot % map->num_stripes; |
3b080b25 WS |
2681 | if (stripe_index == num) |
2682 | return 0; | |
2683 | if (stripe_index < num) | |
2684 | j++; | |
2685 | } | |
2686 | *offset = last_offset + j * map->stripe_len; | |
2687 | return 1; | |
2688 | } | |
2689 | ||
5a6ac9ea MX |
2690 | static void scrub_free_parity(struct scrub_parity *sparity) |
2691 | { | |
2692 | struct scrub_ctx *sctx = sparity->sctx; | |
2693 | struct scrub_page *curr, *next; | |
2694 | int nbits; | |
2695 | ||
2696 | nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors); | |
2697 | if (nbits) { | |
2698 | spin_lock(&sctx->stat_lock); | |
2699 | sctx->stat.read_errors += nbits; | |
2700 | sctx->stat.uncorrectable_errors += nbits; | |
2701 | spin_unlock(&sctx->stat_lock); | |
2702 | } | |
2703 | ||
2704 | list_for_each_entry_safe(curr, next, &sparity->spages, list) { | |
2705 | list_del_init(&curr->list); | |
2706 | scrub_page_put(curr); | |
2707 | } | |
2708 | ||
2709 | kfree(sparity); | |
2710 | } | |
2711 | ||
20b2e302 ZL |
2712 | static void scrub_parity_bio_endio_worker(struct btrfs_work *work) |
2713 | { | |
2714 | struct scrub_parity *sparity = container_of(work, struct scrub_parity, | |
2715 | work); | |
2716 | struct scrub_ctx *sctx = sparity->sctx; | |
2717 | ||
2718 | scrub_free_parity(sparity); | |
2719 | scrub_pending_bio_dec(sctx); | |
2720 | } | |
2721 | ||
4246a0b6 | 2722 | static void scrub_parity_bio_endio(struct bio *bio) |
5a6ac9ea MX |
2723 | { |
2724 | struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private; | |
0b246afa | 2725 | struct btrfs_fs_info *fs_info = sparity->sctx->fs_info; |
5a6ac9ea | 2726 | |
4e4cbee9 | 2727 | if (bio->bi_status) |
5a6ac9ea MX |
2728 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, |
2729 | sparity->nsectors); | |
2730 | ||
5a6ac9ea | 2731 | bio_put(bio); |
20b2e302 ZL |
2732 | |
2733 | btrfs_init_work(&sparity->work, btrfs_scrubparity_helper, | |
2734 | scrub_parity_bio_endio_worker, NULL, NULL); | |
0b246afa | 2735 | btrfs_queue_work(fs_info->scrub_parity_workers, &sparity->work); |
5a6ac9ea MX |
2736 | } |
2737 | ||
2738 | static void scrub_parity_check_and_repair(struct scrub_parity *sparity) | |
2739 | { | |
2740 | struct scrub_ctx *sctx = sparity->sctx; | |
0b246afa | 2741 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
5a6ac9ea MX |
2742 | struct bio *bio; |
2743 | struct btrfs_raid_bio *rbio; | |
5a6ac9ea | 2744 | struct btrfs_bio *bbio = NULL; |
5a6ac9ea MX |
2745 | u64 length; |
2746 | int ret; | |
2747 | ||
2748 | if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap, | |
2749 | sparity->nsectors)) | |
2750 | goto out; | |
2751 | ||
a0dd59de | 2752 | length = sparity->logic_end - sparity->logic_start; |
ae6529c3 QW |
2753 | |
2754 | btrfs_bio_counter_inc_blocked(fs_info); | |
0b246afa | 2755 | ret = btrfs_map_sblock(fs_info, BTRFS_MAP_WRITE, sparity->logic_start, |
825ad4c9 | 2756 | &length, &bbio); |
8e5cfb55 | 2757 | if (ret || !bbio || !bbio->raid_map) |
5a6ac9ea MX |
2758 | goto bbio_out; |
2759 | ||
c5e4c3d7 | 2760 | bio = btrfs_io_bio_alloc(0); |
5a6ac9ea MX |
2761 | bio->bi_iter.bi_sector = sparity->logic_start >> 9; |
2762 | bio->bi_private = sparity; | |
2763 | bio->bi_end_io = scrub_parity_bio_endio; | |
2764 | ||
2ff7e61e | 2765 | rbio = raid56_parity_alloc_scrub_rbio(fs_info, bio, bbio, |
8e5cfb55 | 2766 | length, sparity->scrub_dev, |
5a6ac9ea MX |
2767 | sparity->dbitmap, |
2768 | sparity->nsectors); | |
2769 | if (!rbio) | |
2770 | goto rbio_out; | |
2771 | ||
5a6ac9ea MX |
2772 | scrub_pending_bio_inc(sctx); |
2773 | raid56_parity_submit_scrub_rbio(rbio); | |
2774 | return; | |
2775 | ||
2776 | rbio_out: | |
2777 | bio_put(bio); | |
2778 | bbio_out: | |
ae6529c3 | 2779 | btrfs_bio_counter_dec(fs_info); |
6e9606d2 | 2780 | btrfs_put_bbio(bbio); |
5a6ac9ea MX |
2781 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, |
2782 | sparity->nsectors); | |
2783 | spin_lock(&sctx->stat_lock); | |
2784 | sctx->stat.malloc_errors++; | |
2785 | spin_unlock(&sctx->stat_lock); | |
2786 | out: | |
2787 | scrub_free_parity(sparity); | |
2788 | } | |
2789 | ||
2790 | static inline int scrub_calc_parity_bitmap_len(int nsectors) | |
2791 | { | |
bfca9a6d | 2792 | return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * sizeof(long); |
5a6ac9ea MX |
2793 | } |
2794 | ||
2795 | static void scrub_parity_get(struct scrub_parity *sparity) | |
2796 | { | |
78a76450 | 2797 | refcount_inc(&sparity->refs); |
5a6ac9ea MX |
2798 | } |
2799 | ||
2800 | static void scrub_parity_put(struct scrub_parity *sparity) | |
2801 | { | |
78a76450 | 2802 | if (!refcount_dec_and_test(&sparity->refs)) |
5a6ac9ea MX |
2803 | return; |
2804 | ||
2805 | scrub_parity_check_and_repair(sparity); | |
2806 | } | |
2807 | ||
2808 | static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, | |
2809 | struct map_lookup *map, | |
2810 | struct btrfs_device *sdev, | |
2811 | struct btrfs_path *path, | |
2812 | u64 logic_start, | |
2813 | u64 logic_end) | |
2814 | { | |
fb456252 | 2815 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
5a6ac9ea MX |
2816 | struct btrfs_root *root = fs_info->extent_root; |
2817 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2818 | struct btrfs_extent_item *extent; | |
4a770891 | 2819 | struct btrfs_bio *bbio = NULL; |
5a6ac9ea MX |
2820 | u64 flags; |
2821 | int ret; | |
2822 | int slot; | |
2823 | struct extent_buffer *l; | |
2824 | struct btrfs_key key; | |
2825 | u64 generation; | |
2826 | u64 extent_logical; | |
2827 | u64 extent_physical; | |
2828 | u64 extent_len; | |
4a770891 | 2829 | u64 mapped_length; |
5a6ac9ea MX |
2830 | struct btrfs_device *extent_dev; |
2831 | struct scrub_parity *sparity; | |
2832 | int nsectors; | |
2833 | int bitmap_len; | |
2834 | int extent_mirror_num; | |
2835 | int stop_loop = 0; | |
2836 | ||
0b246afa | 2837 | nsectors = div_u64(map->stripe_len, fs_info->sectorsize); |
5a6ac9ea MX |
2838 | bitmap_len = scrub_calc_parity_bitmap_len(nsectors); |
2839 | sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len, | |
2840 | GFP_NOFS); | |
2841 | if (!sparity) { | |
2842 | spin_lock(&sctx->stat_lock); | |
2843 | sctx->stat.malloc_errors++; | |
2844 | spin_unlock(&sctx->stat_lock); | |
2845 | return -ENOMEM; | |
2846 | } | |
2847 | ||
2848 | sparity->stripe_len = map->stripe_len; | |
2849 | sparity->nsectors = nsectors; | |
2850 | sparity->sctx = sctx; | |
2851 | sparity->scrub_dev = sdev; | |
2852 | sparity->logic_start = logic_start; | |
2853 | sparity->logic_end = logic_end; | |
78a76450 | 2854 | refcount_set(&sparity->refs, 1); |
5a6ac9ea MX |
2855 | INIT_LIST_HEAD(&sparity->spages); |
2856 | sparity->dbitmap = sparity->bitmap; | |
2857 | sparity->ebitmap = (void *)sparity->bitmap + bitmap_len; | |
2858 | ||
2859 | ret = 0; | |
2860 | while (logic_start < logic_end) { | |
2861 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) | |
2862 | key.type = BTRFS_METADATA_ITEM_KEY; | |
2863 | else | |
2864 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2865 | key.objectid = logic_start; | |
2866 | key.offset = (u64)-1; | |
2867 | ||
2868 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2869 | if (ret < 0) | |
2870 | goto out; | |
2871 | ||
2872 | if (ret > 0) { | |
2873 | ret = btrfs_previous_extent_item(root, path, 0); | |
2874 | if (ret < 0) | |
2875 | goto out; | |
2876 | if (ret > 0) { | |
2877 | btrfs_release_path(path); | |
2878 | ret = btrfs_search_slot(NULL, root, &key, | |
2879 | path, 0, 0); | |
2880 | if (ret < 0) | |
2881 | goto out; | |
2882 | } | |
2883 | } | |
2884 | ||
2885 | stop_loop = 0; | |
2886 | while (1) { | |
2887 | u64 bytes; | |
2888 | ||
2889 | l = path->nodes[0]; | |
2890 | slot = path->slots[0]; | |
2891 | if (slot >= btrfs_header_nritems(l)) { | |
2892 | ret = btrfs_next_leaf(root, path); | |
2893 | if (ret == 0) | |
2894 | continue; | |
2895 | if (ret < 0) | |
2896 | goto out; | |
2897 | ||
2898 | stop_loop = 1; | |
2899 | break; | |
2900 | } | |
2901 | btrfs_item_key_to_cpu(l, &key, slot); | |
2902 | ||
d7cad238 ZL |
2903 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
2904 | key.type != BTRFS_METADATA_ITEM_KEY) | |
2905 | goto next; | |
2906 | ||
5a6ac9ea | 2907 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
0b246afa | 2908 | bytes = fs_info->nodesize; |
5a6ac9ea MX |
2909 | else |
2910 | bytes = key.offset; | |
2911 | ||
2912 | if (key.objectid + bytes <= logic_start) | |
2913 | goto next; | |
2914 | ||
a0dd59de | 2915 | if (key.objectid >= logic_end) { |
5a6ac9ea MX |
2916 | stop_loop = 1; |
2917 | break; | |
2918 | } | |
2919 | ||
2920 | while (key.objectid >= logic_start + map->stripe_len) | |
2921 | logic_start += map->stripe_len; | |
2922 | ||
2923 | extent = btrfs_item_ptr(l, slot, | |
2924 | struct btrfs_extent_item); | |
2925 | flags = btrfs_extent_flags(l, extent); | |
2926 | generation = btrfs_extent_generation(l, extent); | |
2927 | ||
a323e813 ZL |
2928 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && |
2929 | (key.objectid < logic_start || | |
2930 | key.objectid + bytes > | |
2931 | logic_start + map->stripe_len)) { | |
5d163e0e JM |
2932 | btrfs_err(fs_info, |
2933 | "scrub: tree block %llu spanning stripes, ignored. logical=%llu", | |
a323e813 | 2934 | key.objectid, logic_start); |
9799d2c3 ZL |
2935 | spin_lock(&sctx->stat_lock); |
2936 | sctx->stat.uncorrectable_errors++; | |
2937 | spin_unlock(&sctx->stat_lock); | |
5a6ac9ea MX |
2938 | goto next; |
2939 | } | |
2940 | again: | |
2941 | extent_logical = key.objectid; | |
2942 | extent_len = bytes; | |
2943 | ||
2944 | if (extent_logical < logic_start) { | |
2945 | extent_len -= logic_start - extent_logical; | |
2946 | extent_logical = logic_start; | |
2947 | } | |
2948 | ||
2949 | if (extent_logical + extent_len > | |
2950 | logic_start + map->stripe_len) | |
2951 | extent_len = logic_start + map->stripe_len - | |
2952 | extent_logical; | |
2953 | ||
2954 | scrub_parity_mark_sectors_data(sparity, extent_logical, | |
2955 | extent_len); | |
2956 | ||
4a770891 | 2957 | mapped_length = extent_len; |
f1fee653 | 2958 | bbio = NULL; |
cf8cddd3 CH |
2959 | ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, |
2960 | extent_logical, &mapped_length, &bbio, | |
2961 | 0); | |
4a770891 OS |
2962 | if (!ret) { |
2963 | if (!bbio || mapped_length < extent_len) | |
2964 | ret = -EIO; | |
2965 | } | |
2966 | if (ret) { | |
2967 | btrfs_put_bbio(bbio); | |
2968 | goto out; | |
2969 | } | |
2970 | extent_physical = bbio->stripes[0].physical; | |
2971 | extent_mirror_num = bbio->mirror_num; | |
2972 | extent_dev = bbio->stripes[0].dev; | |
2973 | btrfs_put_bbio(bbio); | |
5a6ac9ea MX |
2974 | |
2975 | ret = btrfs_lookup_csums_range(csum_root, | |
2976 | extent_logical, | |
2977 | extent_logical + extent_len - 1, | |
2978 | &sctx->csum_list, 1); | |
2979 | if (ret) | |
2980 | goto out; | |
2981 | ||
2982 | ret = scrub_extent_for_parity(sparity, extent_logical, | |
2983 | extent_len, | |
2984 | extent_physical, | |
2985 | extent_dev, flags, | |
2986 | generation, | |
2987 | extent_mirror_num); | |
6fa96d72 ZL |
2988 | |
2989 | scrub_free_csums(sctx); | |
2990 | ||
5a6ac9ea MX |
2991 | if (ret) |
2992 | goto out; | |
2993 | ||
5a6ac9ea MX |
2994 | if (extent_logical + extent_len < |
2995 | key.objectid + bytes) { | |
2996 | logic_start += map->stripe_len; | |
2997 | ||
2998 | if (logic_start >= logic_end) { | |
2999 | stop_loop = 1; | |
3000 | break; | |
3001 | } | |
3002 | ||
3003 | if (logic_start < key.objectid + bytes) { | |
3004 | cond_resched(); | |
3005 | goto again; | |
3006 | } | |
3007 | } | |
3008 | next: | |
3009 | path->slots[0]++; | |
3010 | } | |
3011 | ||
3012 | btrfs_release_path(path); | |
3013 | ||
3014 | if (stop_loop) | |
3015 | break; | |
3016 | ||
3017 | logic_start += map->stripe_len; | |
3018 | } | |
3019 | out: | |
3020 | if (ret < 0) | |
3021 | scrub_parity_mark_sectors_error(sparity, logic_start, | |
a0dd59de | 3022 | logic_end - logic_start); |
5a6ac9ea MX |
3023 | scrub_parity_put(sparity); |
3024 | scrub_submit(sctx); | |
3fb99303 | 3025 | mutex_lock(&sctx->wr_lock); |
5a6ac9ea | 3026 | scrub_wr_submit(sctx); |
3fb99303 | 3027 | mutex_unlock(&sctx->wr_lock); |
5a6ac9ea MX |
3028 | |
3029 | btrfs_release_path(path); | |
3030 | return ret < 0 ? ret : 0; | |
3031 | } | |
3032 | ||
d9d181c1 | 3033 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
a36cf8b8 SB |
3034 | struct map_lookup *map, |
3035 | struct btrfs_device *scrub_dev, | |
32934280 | 3036 | int num, u64 base, u64 length) |
a2de733c | 3037 | { |
5a6ac9ea | 3038 | struct btrfs_path *path, *ppath; |
fb456252 | 3039 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
a2de733c AJ |
3040 | struct btrfs_root *root = fs_info->extent_root; |
3041 | struct btrfs_root *csum_root = fs_info->csum_root; | |
3042 | struct btrfs_extent_item *extent; | |
e7786c3a | 3043 | struct blk_plug plug; |
a2de733c AJ |
3044 | u64 flags; |
3045 | int ret; | |
3046 | int slot; | |
a2de733c | 3047 | u64 nstripes; |
a2de733c | 3048 | struct extent_buffer *l; |
a2de733c AJ |
3049 | u64 physical; |
3050 | u64 logical; | |
625f1c8d | 3051 | u64 logic_end; |
3b080b25 | 3052 | u64 physical_end; |
a2de733c | 3053 | u64 generation; |
e12fa9cd | 3054 | int mirror_num; |
7a26285e AJ |
3055 | struct reada_control *reada1; |
3056 | struct reada_control *reada2; | |
e6c11f9a | 3057 | struct btrfs_key key; |
7a26285e | 3058 | struct btrfs_key key_end; |
a2de733c AJ |
3059 | u64 increment = map->stripe_len; |
3060 | u64 offset; | |
ff023aac SB |
3061 | u64 extent_logical; |
3062 | u64 extent_physical; | |
3063 | u64 extent_len; | |
5a6ac9ea MX |
3064 | u64 stripe_logical; |
3065 | u64 stripe_end; | |
ff023aac SB |
3066 | struct btrfs_device *extent_dev; |
3067 | int extent_mirror_num; | |
3b080b25 | 3068 | int stop_loop = 0; |
53b381b3 | 3069 | |
3b080b25 | 3070 | physical = map->stripes[num].physical; |
a2de733c | 3071 | offset = 0; |
42c61ab6 | 3072 | nstripes = div64_u64(length, map->stripe_len); |
a2de733c AJ |
3073 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
3074 | offset = map->stripe_len * num; | |
3075 | increment = map->stripe_len * map->num_stripes; | |
193ea74b | 3076 | mirror_num = 1; |
a2de733c AJ |
3077 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
3078 | int factor = map->num_stripes / map->sub_stripes; | |
3079 | offset = map->stripe_len * (num / map->sub_stripes); | |
3080 | increment = map->stripe_len * factor; | |
193ea74b | 3081 | mirror_num = num % map->sub_stripes + 1; |
a2de733c AJ |
3082 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
3083 | increment = map->stripe_len; | |
193ea74b | 3084 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
3085 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
3086 | increment = map->stripe_len; | |
193ea74b | 3087 | mirror_num = num % map->num_stripes + 1; |
ffe2d203 | 3088 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
5a6ac9ea | 3089 | get_raid56_logic_offset(physical, num, map, &offset, NULL); |
3b080b25 WS |
3090 | increment = map->stripe_len * nr_data_stripes(map); |
3091 | mirror_num = 1; | |
a2de733c AJ |
3092 | } else { |
3093 | increment = map->stripe_len; | |
193ea74b | 3094 | mirror_num = 1; |
a2de733c AJ |
3095 | } |
3096 | ||
3097 | path = btrfs_alloc_path(); | |
3098 | if (!path) | |
3099 | return -ENOMEM; | |
3100 | ||
5a6ac9ea MX |
3101 | ppath = btrfs_alloc_path(); |
3102 | if (!ppath) { | |
379d6854 | 3103 | btrfs_free_path(path); |
5a6ac9ea MX |
3104 | return -ENOMEM; |
3105 | } | |
3106 | ||
b5d67f64 SB |
3107 | /* |
3108 | * work on commit root. The related disk blocks are static as | |
3109 | * long as COW is applied. This means, it is save to rewrite | |
3110 | * them to repair disk errors without any race conditions | |
3111 | */ | |
a2de733c AJ |
3112 | path->search_commit_root = 1; |
3113 | path->skip_locking = 1; | |
3114 | ||
063c54dc GH |
3115 | ppath->search_commit_root = 1; |
3116 | ppath->skip_locking = 1; | |
a2de733c | 3117 | /* |
7a26285e AJ |
3118 | * trigger the readahead for extent tree csum tree and wait for |
3119 | * completion. During readahead, the scrub is officially paused | |
3120 | * to not hold off transaction commits | |
a2de733c AJ |
3121 | */ |
3122 | logical = base + offset; | |
3b080b25 | 3123 | physical_end = physical + nstripes * map->stripe_len; |
ffe2d203 | 3124 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3b080b25 | 3125 | get_raid56_logic_offset(physical_end, num, |
5a6ac9ea | 3126 | map, &logic_end, NULL); |
3b080b25 WS |
3127 | logic_end += base; |
3128 | } else { | |
3129 | logic_end = logical + increment * nstripes; | |
3130 | } | |
d9d181c1 | 3131 | wait_event(sctx->list_wait, |
b6bfebc1 | 3132 | atomic_read(&sctx->bios_in_flight) == 0); |
cb7ab021 | 3133 | scrub_blocked_if_needed(fs_info); |
7a26285e AJ |
3134 | |
3135 | /* FIXME it might be better to start readahead at commit root */ | |
e6c11f9a DS |
3136 | key.objectid = logical; |
3137 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
3138 | key.offset = (u64)0; | |
3b080b25 | 3139 | key_end.objectid = logic_end; |
3173a18f JB |
3140 | key_end.type = BTRFS_METADATA_ITEM_KEY; |
3141 | key_end.offset = (u64)-1; | |
e6c11f9a | 3142 | reada1 = btrfs_reada_add(root, &key, &key_end); |
7a26285e | 3143 | |
e6c11f9a DS |
3144 | key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
3145 | key.type = BTRFS_EXTENT_CSUM_KEY; | |
3146 | key.offset = logical; | |
7a26285e AJ |
3147 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
3148 | key_end.type = BTRFS_EXTENT_CSUM_KEY; | |
3b080b25 | 3149 | key_end.offset = logic_end; |
e6c11f9a | 3150 | reada2 = btrfs_reada_add(csum_root, &key, &key_end); |
7a26285e AJ |
3151 | |
3152 | if (!IS_ERR(reada1)) | |
3153 | btrfs_reada_wait(reada1); | |
3154 | if (!IS_ERR(reada2)) | |
3155 | btrfs_reada_wait(reada2); | |
3156 | ||
a2de733c AJ |
3157 | |
3158 | /* | |
3159 | * collect all data csums for the stripe to avoid seeking during | |
3160 | * the scrub. This might currently (crc32) end up to be about 1MB | |
3161 | */ | |
e7786c3a | 3162 | blk_start_plug(&plug); |
a2de733c | 3163 | |
a2de733c AJ |
3164 | /* |
3165 | * now find all extents for each stripe and scrub them | |
3166 | */ | |
a2de733c | 3167 | ret = 0; |
3b080b25 | 3168 | while (physical < physical_end) { |
a2de733c AJ |
3169 | /* |
3170 | * canceled? | |
3171 | */ | |
3172 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
d9d181c1 | 3173 | atomic_read(&sctx->cancel_req)) { |
a2de733c AJ |
3174 | ret = -ECANCELED; |
3175 | goto out; | |
3176 | } | |
3177 | /* | |
3178 | * check to see if we have to pause | |
3179 | */ | |
3180 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
3181 | /* push queued extents */ | |
2073c4c2 | 3182 | sctx->flush_all_writes = true; |
d9d181c1 | 3183 | scrub_submit(sctx); |
3fb99303 | 3184 | mutex_lock(&sctx->wr_lock); |
ff023aac | 3185 | scrub_wr_submit(sctx); |
3fb99303 | 3186 | mutex_unlock(&sctx->wr_lock); |
d9d181c1 | 3187 | wait_event(sctx->list_wait, |
b6bfebc1 | 3188 | atomic_read(&sctx->bios_in_flight) == 0); |
2073c4c2 | 3189 | sctx->flush_all_writes = false; |
3cb0929a | 3190 | scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3191 | } |
3192 | ||
f2f66a2f ZL |
3193 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3194 | ret = get_raid56_logic_offset(physical, num, map, | |
3195 | &logical, | |
3196 | &stripe_logical); | |
3197 | logical += base; | |
3198 | if (ret) { | |
7955323b | 3199 | /* it is parity strip */ |
f2f66a2f | 3200 | stripe_logical += base; |
a0dd59de | 3201 | stripe_end = stripe_logical + increment; |
f2f66a2f ZL |
3202 | ret = scrub_raid56_parity(sctx, map, scrub_dev, |
3203 | ppath, stripe_logical, | |
3204 | stripe_end); | |
3205 | if (ret) | |
3206 | goto out; | |
3207 | goto skip; | |
3208 | } | |
3209 | } | |
3210 | ||
7c76edb7 WS |
3211 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
3212 | key.type = BTRFS_METADATA_ITEM_KEY; | |
3213 | else | |
3214 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
a2de733c | 3215 | key.objectid = logical; |
625f1c8d | 3216 | key.offset = (u64)-1; |
a2de733c AJ |
3217 | |
3218 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3219 | if (ret < 0) | |
3220 | goto out; | |
3173a18f | 3221 | |
8c51032f | 3222 | if (ret > 0) { |
ade2e0b3 | 3223 | ret = btrfs_previous_extent_item(root, path, 0); |
a2de733c AJ |
3224 | if (ret < 0) |
3225 | goto out; | |
8c51032f AJ |
3226 | if (ret > 0) { |
3227 | /* there's no smaller item, so stick with the | |
3228 | * larger one */ | |
3229 | btrfs_release_path(path); | |
3230 | ret = btrfs_search_slot(NULL, root, &key, | |
3231 | path, 0, 0); | |
3232 | if (ret < 0) | |
3233 | goto out; | |
3234 | } | |
a2de733c AJ |
3235 | } |
3236 | ||
625f1c8d | 3237 | stop_loop = 0; |
a2de733c | 3238 | while (1) { |
3173a18f JB |
3239 | u64 bytes; |
3240 | ||
a2de733c AJ |
3241 | l = path->nodes[0]; |
3242 | slot = path->slots[0]; | |
3243 | if (slot >= btrfs_header_nritems(l)) { | |
3244 | ret = btrfs_next_leaf(root, path); | |
3245 | if (ret == 0) | |
3246 | continue; | |
3247 | if (ret < 0) | |
3248 | goto out; | |
3249 | ||
625f1c8d | 3250 | stop_loop = 1; |
a2de733c AJ |
3251 | break; |
3252 | } | |
3253 | btrfs_item_key_to_cpu(l, &key, slot); | |
3254 | ||
d7cad238 ZL |
3255 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
3256 | key.type != BTRFS_METADATA_ITEM_KEY) | |
3257 | goto next; | |
3258 | ||
3173a18f | 3259 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
0b246afa | 3260 | bytes = fs_info->nodesize; |
3173a18f JB |
3261 | else |
3262 | bytes = key.offset; | |
3263 | ||
3264 | if (key.objectid + bytes <= logical) | |
a2de733c AJ |
3265 | goto next; |
3266 | ||
625f1c8d LB |
3267 | if (key.objectid >= logical + map->stripe_len) { |
3268 | /* out of this device extent */ | |
3269 | if (key.objectid >= logic_end) | |
3270 | stop_loop = 1; | |
3271 | break; | |
3272 | } | |
a2de733c AJ |
3273 | |
3274 | extent = btrfs_item_ptr(l, slot, | |
3275 | struct btrfs_extent_item); | |
3276 | flags = btrfs_extent_flags(l, extent); | |
3277 | generation = btrfs_extent_generation(l, extent); | |
3278 | ||
a323e813 ZL |
3279 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && |
3280 | (key.objectid < logical || | |
3281 | key.objectid + bytes > | |
3282 | logical + map->stripe_len)) { | |
efe120a0 | 3283 | btrfs_err(fs_info, |
5d163e0e | 3284 | "scrub: tree block %llu spanning stripes, ignored. logical=%llu", |
c1c9ff7c | 3285 | key.objectid, logical); |
9799d2c3 ZL |
3286 | spin_lock(&sctx->stat_lock); |
3287 | sctx->stat.uncorrectable_errors++; | |
3288 | spin_unlock(&sctx->stat_lock); | |
a2de733c AJ |
3289 | goto next; |
3290 | } | |
3291 | ||
625f1c8d LB |
3292 | again: |
3293 | extent_logical = key.objectid; | |
3294 | extent_len = bytes; | |
3295 | ||
a2de733c AJ |
3296 | /* |
3297 | * trim extent to this stripe | |
3298 | */ | |
625f1c8d LB |
3299 | if (extent_logical < logical) { |
3300 | extent_len -= logical - extent_logical; | |
3301 | extent_logical = logical; | |
a2de733c | 3302 | } |
625f1c8d | 3303 | if (extent_logical + extent_len > |
a2de733c | 3304 | logical + map->stripe_len) { |
625f1c8d LB |
3305 | extent_len = logical + map->stripe_len - |
3306 | extent_logical; | |
a2de733c AJ |
3307 | } |
3308 | ||
625f1c8d | 3309 | extent_physical = extent_logical - logical + physical; |
ff023aac SB |
3310 | extent_dev = scrub_dev; |
3311 | extent_mirror_num = mirror_num; | |
32934280 | 3312 | if (sctx->is_dev_replace) |
ff023aac SB |
3313 | scrub_remap_extent(fs_info, extent_logical, |
3314 | extent_len, &extent_physical, | |
3315 | &extent_dev, | |
3316 | &extent_mirror_num); | |
625f1c8d | 3317 | |
fe8cf654 ZL |
3318 | ret = btrfs_lookup_csums_range(csum_root, |
3319 | extent_logical, | |
3320 | extent_logical + | |
3321 | extent_len - 1, | |
3322 | &sctx->csum_list, 1); | |
625f1c8d LB |
3323 | if (ret) |
3324 | goto out; | |
3325 | ||
6ca1765b | 3326 | ret = scrub_extent(sctx, map, extent_logical, extent_len, |
ff023aac SB |
3327 | extent_physical, extent_dev, flags, |
3328 | generation, extent_mirror_num, | |
115930cb | 3329 | extent_logical - logical + physical); |
6fa96d72 ZL |
3330 | |
3331 | scrub_free_csums(sctx); | |
3332 | ||
a2de733c AJ |
3333 | if (ret) |
3334 | goto out; | |
3335 | ||
625f1c8d LB |
3336 | if (extent_logical + extent_len < |
3337 | key.objectid + bytes) { | |
ffe2d203 | 3338 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3b080b25 WS |
3339 | /* |
3340 | * loop until we find next data stripe | |
3341 | * or we have finished all stripes. | |
3342 | */ | |
5a6ac9ea MX |
3343 | loop: |
3344 | physical += map->stripe_len; | |
3345 | ret = get_raid56_logic_offset(physical, | |
3346 | num, map, &logical, | |
3347 | &stripe_logical); | |
3348 | logical += base; | |
3349 | ||
3350 | if (ret && physical < physical_end) { | |
3351 | stripe_logical += base; | |
3352 | stripe_end = stripe_logical + | |
a0dd59de | 3353 | increment; |
5a6ac9ea MX |
3354 | ret = scrub_raid56_parity(sctx, |
3355 | map, scrub_dev, ppath, | |
3356 | stripe_logical, | |
3357 | stripe_end); | |
3358 | if (ret) | |
3359 | goto out; | |
3360 | goto loop; | |
3361 | } | |
3b080b25 WS |
3362 | } else { |
3363 | physical += map->stripe_len; | |
3364 | logical += increment; | |
3365 | } | |
625f1c8d LB |
3366 | if (logical < key.objectid + bytes) { |
3367 | cond_resched(); | |
3368 | goto again; | |
3369 | } | |
3370 | ||
3b080b25 | 3371 | if (physical >= physical_end) { |
625f1c8d LB |
3372 | stop_loop = 1; |
3373 | break; | |
3374 | } | |
3375 | } | |
a2de733c AJ |
3376 | next: |
3377 | path->slots[0]++; | |
3378 | } | |
71267333 | 3379 | btrfs_release_path(path); |
3b080b25 | 3380 | skip: |
a2de733c AJ |
3381 | logical += increment; |
3382 | physical += map->stripe_len; | |
d9d181c1 | 3383 | spin_lock(&sctx->stat_lock); |
625f1c8d LB |
3384 | if (stop_loop) |
3385 | sctx->stat.last_physical = map->stripes[num].physical + | |
3386 | length; | |
3387 | else | |
3388 | sctx->stat.last_physical = physical; | |
d9d181c1 | 3389 | spin_unlock(&sctx->stat_lock); |
625f1c8d LB |
3390 | if (stop_loop) |
3391 | break; | |
a2de733c | 3392 | } |
ff023aac | 3393 | out: |
a2de733c | 3394 | /* push queued extents */ |
d9d181c1 | 3395 | scrub_submit(sctx); |
3fb99303 | 3396 | mutex_lock(&sctx->wr_lock); |
ff023aac | 3397 | scrub_wr_submit(sctx); |
3fb99303 | 3398 | mutex_unlock(&sctx->wr_lock); |
a2de733c | 3399 | |
e7786c3a | 3400 | blk_finish_plug(&plug); |
a2de733c | 3401 | btrfs_free_path(path); |
5a6ac9ea | 3402 | btrfs_free_path(ppath); |
a2de733c AJ |
3403 | return ret < 0 ? ret : 0; |
3404 | } | |
3405 | ||
d9d181c1 | 3406 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
a36cf8b8 | 3407 | struct btrfs_device *scrub_dev, |
a36cf8b8 | 3408 | u64 chunk_offset, u64 length, |
020d5b73 | 3409 | u64 dev_offset, |
32934280 | 3410 | struct btrfs_block_group_cache *cache) |
a2de733c | 3411 | { |
fb456252 JM |
3412 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
3413 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; | |
a2de733c AJ |
3414 | struct map_lookup *map; |
3415 | struct extent_map *em; | |
3416 | int i; | |
ff023aac | 3417 | int ret = 0; |
a2de733c AJ |
3418 | |
3419 | read_lock(&map_tree->map_tree.lock); | |
3420 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | |
3421 | read_unlock(&map_tree->map_tree.lock); | |
3422 | ||
020d5b73 FM |
3423 | if (!em) { |
3424 | /* | |
3425 | * Might have been an unused block group deleted by the cleaner | |
3426 | * kthread or relocation. | |
3427 | */ | |
3428 | spin_lock(&cache->lock); | |
3429 | if (!cache->removed) | |
3430 | ret = -EINVAL; | |
3431 | spin_unlock(&cache->lock); | |
3432 | ||
3433 | return ret; | |
3434 | } | |
a2de733c | 3435 | |
95617d69 | 3436 | map = em->map_lookup; |
a2de733c AJ |
3437 | if (em->start != chunk_offset) |
3438 | goto out; | |
3439 | ||
3440 | if (em->len < length) | |
3441 | goto out; | |
3442 | ||
3443 | for (i = 0; i < map->num_stripes; ++i) { | |
a36cf8b8 | 3444 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
859acaf1 | 3445 | map->stripes[i].physical == dev_offset) { |
a36cf8b8 | 3446 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
32934280 | 3447 | chunk_offset, length); |
a2de733c AJ |
3448 | if (ret) |
3449 | goto out; | |
3450 | } | |
3451 | } | |
3452 | out: | |
3453 | free_extent_map(em); | |
3454 | ||
3455 | return ret; | |
3456 | } | |
3457 | ||
3458 | static noinline_for_stack | |
a36cf8b8 | 3459 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
32934280 | 3460 | struct btrfs_device *scrub_dev, u64 start, u64 end) |
a2de733c AJ |
3461 | { |
3462 | struct btrfs_dev_extent *dev_extent = NULL; | |
3463 | struct btrfs_path *path; | |
0b246afa JM |
3464 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
3465 | struct btrfs_root *root = fs_info->dev_root; | |
a2de733c | 3466 | u64 length; |
a2de733c | 3467 | u64 chunk_offset; |
55e3a601 | 3468 | int ret = 0; |
76a8efa1 | 3469 | int ro_set; |
a2de733c AJ |
3470 | int slot; |
3471 | struct extent_buffer *l; | |
3472 | struct btrfs_key key; | |
3473 | struct btrfs_key found_key; | |
3474 | struct btrfs_block_group_cache *cache; | |
ff023aac | 3475 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
a2de733c AJ |
3476 | |
3477 | path = btrfs_alloc_path(); | |
3478 | if (!path) | |
3479 | return -ENOMEM; | |
3480 | ||
e4058b54 | 3481 | path->reada = READA_FORWARD; |
a2de733c AJ |
3482 | path->search_commit_root = 1; |
3483 | path->skip_locking = 1; | |
3484 | ||
a36cf8b8 | 3485 | key.objectid = scrub_dev->devid; |
a2de733c AJ |
3486 | key.offset = 0ull; |
3487 | key.type = BTRFS_DEV_EXTENT_KEY; | |
3488 | ||
a2de733c AJ |
3489 | while (1) { |
3490 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3491 | if (ret < 0) | |
8c51032f AJ |
3492 | break; |
3493 | if (ret > 0) { | |
3494 | if (path->slots[0] >= | |
3495 | btrfs_header_nritems(path->nodes[0])) { | |
3496 | ret = btrfs_next_leaf(root, path); | |
55e3a601 Z |
3497 | if (ret < 0) |
3498 | break; | |
3499 | if (ret > 0) { | |
3500 | ret = 0; | |
8c51032f | 3501 | break; |
55e3a601 Z |
3502 | } |
3503 | } else { | |
3504 | ret = 0; | |
8c51032f AJ |
3505 | } |
3506 | } | |
a2de733c AJ |
3507 | |
3508 | l = path->nodes[0]; | |
3509 | slot = path->slots[0]; | |
3510 | ||
3511 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
3512 | ||
a36cf8b8 | 3513 | if (found_key.objectid != scrub_dev->devid) |
a2de733c AJ |
3514 | break; |
3515 | ||
962a298f | 3516 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) |
a2de733c AJ |
3517 | break; |
3518 | ||
3519 | if (found_key.offset >= end) | |
3520 | break; | |
3521 | ||
3522 | if (found_key.offset < key.offset) | |
3523 | break; | |
3524 | ||
3525 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
3526 | length = btrfs_dev_extent_length(l, dev_extent); | |
3527 | ||
ced96edc QW |
3528 | if (found_key.offset + length <= start) |
3529 | goto skip; | |
a2de733c | 3530 | |
a2de733c AJ |
3531 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); |
3532 | ||
3533 | /* | |
3534 | * get a reference on the corresponding block group to prevent | |
3535 | * the chunk from going away while we scrub it | |
3536 | */ | |
3537 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
ced96edc QW |
3538 | |
3539 | /* some chunks are removed but not committed to disk yet, | |
3540 | * continue scrubbing */ | |
3541 | if (!cache) | |
3542 | goto skip; | |
3543 | ||
55e3a601 Z |
3544 | /* |
3545 | * we need call btrfs_inc_block_group_ro() with scrubs_paused, | |
3546 | * to avoid deadlock caused by: | |
3547 | * btrfs_inc_block_group_ro() | |
3548 | * -> btrfs_wait_for_commit() | |
3549 | * -> btrfs_commit_transaction() | |
3550 | * -> btrfs_scrub_pause() | |
3551 | */ | |
3552 | scrub_pause_on(fs_info); | |
c83488af | 3553 | ret = btrfs_inc_block_group_ro(cache); |
32934280 | 3554 | if (!ret && sctx->is_dev_replace) { |
f0e9b7d6 FM |
3555 | /* |
3556 | * If we are doing a device replace wait for any tasks | |
52042d8e | 3557 | * that started delalloc right before we set the block |
f0e9b7d6 FM |
3558 | * group to RO mode, as they might have just allocated |
3559 | * an extent from it or decided they could do a nocow | |
3560 | * write. And if any such tasks did that, wait for their | |
3561 | * ordered extents to complete and then commit the | |
3562 | * current transaction, so that we can later see the new | |
3563 | * extent items in the extent tree - the ordered extents | |
3564 | * create delayed data references (for cow writes) when | |
3565 | * they complete, which will be run and insert the | |
3566 | * corresponding extent items into the extent tree when | |
3567 | * we commit the transaction they used when running | |
3568 | * inode.c:btrfs_finish_ordered_io(). We later use | |
3569 | * the commit root of the extent tree to find extents | |
3570 | * to copy from the srcdev into the tgtdev, and we don't | |
3571 | * want to miss any new extents. | |
3572 | */ | |
3573 | btrfs_wait_block_group_reservations(cache); | |
3574 | btrfs_wait_nocow_writers(cache); | |
6374e57a | 3575 | ret = btrfs_wait_ordered_roots(fs_info, U64_MAX, |
f0e9b7d6 FM |
3576 | cache->key.objectid, |
3577 | cache->key.offset); | |
3578 | if (ret > 0) { | |
3579 | struct btrfs_trans_handle *trans; | |
3580 | ||
3581 | trans = btrfs_join_transaction(root); | |
3582 | if (IS_ERR(trans)) | |
3583 | ret = PTR_ERR(trans); | |
3584 | else | |
3a45bb20 | 3585 | ret = btrfs_commit_transaction(trans); |
f0e9b7d6 FM |
3586 | if (ret) { |
3587 | scrub_pause_off(fs_info); | |
3588 | btrfs_put_block_group(cache); | |
3589 | break; | |
3590 | } | |
3591 | } | |
3592 | } | |
55e3a601 | 3593 | scrub_pause_off(fs_info); |
76a8efa1 Z |
3594 | |
3595 | if (ret == 0) { | |
3596 | ro_set = 1; | |
3597 | } else if (ret == -ENOSPC) { | |
3598 | /* | |
3599 | * btrfs_inc_block_group_ro return -ENOSPC when it | |
3600 | * failed in creating new chunk for metadata. | |
3601 | * It is not a problem for scrub/replace, because | |
3602 | * metadata are always cowed, and our scrub paused | |
3603 | * commit_transactions. | |
3604 | */ | |
3605 | ro_set = 0; | |
3606 | } else { | |
5d163e0e | 3607 | btrfs_warn(fs_info, |
913e1535 | 3608 | "failed setting block group ro: %d", ret); |
55e3a601 Z |
3609 | btrfs_put_block_group(cache); |
3610 | break; | |
3611 | } | |
3612 | ||
cb5583dd | 3613 | down_write(&fs_info->dev_replace.rwsem); |
ff023aac SB |
3614 | dev_replace->cursor_right = found_key.offset + length; |
3615 | dev_replace->cursor_left = found_key.offset; | |
3616 | dev_replace->item_needs_writeback = 1; | |
cb5583dd DS |
3617 | up_write(&dev_replace->rwsem); |
3618 | ||
8c204c96 | 3619 | ret = scrub_chunk(sctx, scrub_dev, chunk_offset, length, |
32934280 | 3620 | found_key.offset, cache); |
ff023aac SB |
3621 | |
3622 | /* | |
3623 | * flush, submit all pending read and write bios, afterwards | |
3624 | * wait for them. | |
3625 | * Note that in the dev replace case, a read request causes | |
3626 | * write requests that are submitted in the read completion | |
3627 | * worker. Therefore in the current situation, it is required | |
3628 | * that all write requests are flushed, so that all read and | |
3629 | * write requests are really completed when bios_in_flight | |
3630 | * changes to 0. | |
3631 | */ | |
2073c4c2 | 3632 | sctx->flush_all_writes = true; |
ff023aac | 3633 | scrub_submit(sctx); |
3fb99303 | 3634 | mutex_lock(&sctx->wr_lock); |
ff023aac | 3635 | scrub_wr_submit(sctx); |
3fb99303 | 3636 | mutex_unlock(&sctx->wr_lock); |
ff023aac SB |
3637 | |
3638 | wait_event(sctx->list_wait, | |
3639 | atomic_read(&sctx->bios_in_flight) == 0); | |
b708ce96 Z |
3640 | |
3641 | scrub_pause_on(fs_info); | |
12cf9372 WS |
3642 | |
3643 | /* | |
3644 | * must be called before we decrease @scrub_paused. | |
3645 | * make sure we don't block transaction commit while | |
3646 | * we are waiting pending workers finished. | |
3647 | */ | |
ff023aac SB |
3648 | wait_event(sctx->list_wait, |
3649 | atomic_read(&sctx->workers_pending) == 0); | |
2073c4c2 | 3650 | sctx->flush_all_writes = false; |
12cf9372 | 3651 | |
b708ce96 | 3652 | scrub_pause_off(fs_info); |
ff023aac | 3653 | |
cb5583dd | 3654 | down_write(&fs_info->dev_replace.rwsem); |
1a1a8b73 FM |
3655 | dev_replace->cursor_left = dev_replace->cursor_right; |
3656 | dev_replace->item_needs_writeback = 1; | |
cb5583dd | 3657 | up_write(&fs_info->dev_replace.rwsem); |
1a1a8b73 | 3658 | |
76a8efa1 | 3659 | if (ro_set) |
2ff7e61e | 3660 | btrfs_dec_block_group_ro(cache); |
ff023aac | 3661 | |
758f2dfc FM |
3662 | /* |
3663 | * We might have prevented the cleaner kthread from deleting | |
3664 | * this block group if it was already unused because we raced | |
3665 | * and set it to RO mode first. So add it back to the unused | |
3666 | * list, otherwise it might not ever be deleted unless a manual | |
3667 | * balance is triggered or it becomes used and unused again. | |
3668 | */ | |
3669 | spin_lock(&cache->lock); | |
3670 | if (!cache->removed && !cache->ro && cache->reserved == 0 && | |
3671 | btrfs_block_group_used(&cache->item) == 0) { | |
3672 | spin_unlock(&cache->lock); | |
031f24da | 3673 | btrfs_mark_bg_unused(cache); |
758f2dfc FM |
3674 | } else { |
3675 | spin_unlock(&cache->lock); | |
3676 | } | |
3677 | ||
a2de733c AJ |
3678 | btrfs_put_block_group(cache); |
3679 | if (ret) | |
3680 | break; | |
32934280 | 3681 | if (sctx->is_dev_replace && |
af1be4f8 | 3682 | atomic64_read(&dev_replace->num_write_errors) > 0) { |
ff023aac SB |
3683 | ret = -EIO; |
3684 | break; | |
3685 | } | |
3686 | if (sctx->stat.malloc_errors > 0) { | |
3687 | ret = -ENOMEM; | |
3688 | break; | |
3689 | } | |
ced96edc | 3690 | skip: |
a2de733c | 3691 | key.offset = found_key.offset + length; |
71267333 | 3692 | btrfs_release_path(path); |
a2de733c AJ |
3693 | } |
3694 | ||
a2de733c | 3695 | btrfs_free_path(path); |
8c51032f | 3696 | |
55e3a601 | 3697 | return ret; |
a2de733c AJ |
3698 | } |
3699 | ||
a36cf8b8 SB |
3700 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
3701 | struct btrfs_device *scrub_dev) | |
a2de733c AJ |
3702 | { |
3703 | int i; | |
3704 | u64 bytenr; | |
3705 | u64 gen; | |
3706 | int ret; | |
0b246afa | 3707 | struct btrfs_fs_info *fs_info = sctx->fs_info; |
a2de733c | 3708 | |
0b246afa | 3709 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) |
79787eaa JM |
3710 | return -EIO; |
3711 | ||
5f546063 | 3712 | /* Seed devices of a new filesystem has their own generation. */ |
0b246afa | 3713 | if (scrub_dev->fs_devices != fs_info->fs_devices) |
5f546063 MX |
3714 | gen = scrub_dev->generation; |
3715 | else | |
0b246afa | 3716 | gen = fs_info->last_trans_committed; |
a2de733c AJ |
3717 | |
3718 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
3719 | bytenr = btrfs_sb_offset(i); | |
935e5cc9 MX |
3720 | if (bytenr + BTRFS_SUPER_INFO_SIZE > |
3721 | scrub_dev->commit_total_bytes) | |
a2de733c AJ |
3722 | break; |
3723 | ||
d9d181c1 | 3724 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
a36cf8b8 | 3725 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
ff023aac | 3726 | NULL, 1, bytenr); |
a2de733c AJ |
3727 | if (ret) |
3728 | return ret; | |
3729 | } | |
b6bfebc1 | 3730 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3731 | |
3732 | return 0; | |
3733 | } | |
3734 | ||
3735 | /* | |
3736 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
3737 | */ | |
ff023aac SB |
3738 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
3739 | int is_dev_replace) | |
a2de733c | 3740 | { |
6f011058 | 3741 | unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND; |
0339ef2f | 3742 | int max_active = fs_info->thread_pool_size; |
a2de733c | 3743 | |
632dd772 | 3744 | if (fs_info->scrub_workers_refcnt == 0) { |
af1cbe0a DS |
3745 | fs_info->scrub_workers = btrfs_alloc_workqueue(fs_info, "scrub", |
3746 | flags, is_dev_replace ? 1 : max_active, 4); | |
e82afc52 ZL |
3747 | if (!fs_info->scrub_workers) |
3748 | goto fail_scrub_workers; | |
3749 | ||
0339ef2f | 3750 | fs_info->scrub_wr_completion_workers = |
cb001095 | 3751 | btrfs_alloc_workqueue(fs_info, "scrubwrc", flags, |
0339ef2f | 3752 | max_active, 2); |
e82afc52 ZL |
3753 | if (!fs_info->scrub_wr_completion_workers) |
3754 | goto fail_scrub_wr_completion_workers; | |
3755 | ||
20b2e302 | 3756 | fs_info->scrub_parity_workers = |
cb001095 | 3757 | btrfs_alloc_workqueue(fs_info, "scrubparity", flags, |
20b2e302 | 3758 | max_active, 2); |
e82afc52 ZL |
3759 | if (!fs_info->scrub_parity_workers) |
3760 | goto fail_scrub_parity_workers; | |
632dd772 | 3761 | } |
a2de733c | 3762 | ++fs_info->scrub_workers_refcnt; |
e82afc52 ZL |
3763 | return 0; |
3764 | ||
3765 | fail_scrub_parity_workers: | |
e82afc52 ZL |
3766 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); |
3767 | fail_scrub_wr_completion_workers: | |
3768 | btrfs_destroy_workqueue(fs_info->scrub_workers); | |
3769 | fail_scrub_workers: | |
3770 | return -ENOMEM; | |
a2de733c AJ |
3771 | } |
3772 | ||
aa1b8cd4 SB |
3773 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
3774 | u64 end, struct btrfs_scrub_progress *progress, | |
63a212ab | 3775 | int readonly, int is_dev_replace) |
a2de733c | 3776 | { |
d9d181c1 | 3777 | struct scrub_ctx *sctx; |
a2de733c AJ |
3778 | int ret; |
3779 | struct btrfs_device *dev; | |
a5fb1142 | 3780 | unsigned int nofs_flag; |
1cec3f27 AJ |
3781 | struct btrfs_workqueue *scrub_workers = NULL; |
3782 | struct btrfs_workqueue *scrub_wr_comp = NULL; | |
3783 | struct btrfs_workqueue *scrub_parity = NULL; | |
a2de733c | 3784 | |
aa1b8cd4 | 3785 | if (btrfs_fs_closing(fs_info)) |
a2de733c AJ |
3786 | return -EINVAL; |
3787 | ||
da17066c | 3788 | if (fs_info->nodesize > BTRFS_STRIPE_LEN) { |
b5d67f64 SB |
3789 | /* |
3790 | * in this case scrub is unable to calculate the checksum | |
3791 | * the way scrub is implemented. Do not handle this | |
3792 | * situation at all because it won't ever happen. | |
3793 | */ | |
efe120a0 FH |
3794 | btrfs_err(fs_info, |
3795 | "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails", | |
da17066c JM |
3796 | fs_info->nodesize, |
3797 | BTRFS_STRIPE_LEN); | |
b5d67f64 SB |
3798 | return -EINVAL; |
3799 | } | |
3800 | ||
da17066c | 3801 | if (fs_info->sectorsize != PAGE_SIZE) { |
b5d67f64 | 3802 | /* not supported for data w/o checksums */ |
751bebbe | 3803 | btrfs_err_rl(fs_info, |
5d163e0e | 3804 | "scrub: size assumption sectorsize != PAGE_SIZE (%d != %lu) fails", |
da17066c | 3805 | fs_info->sectorsize, PAGE_SIZE); |
a2de733c AJ |
3806 | return -EINVAL; |
3807 | } | |
3808 | ||
da17066c | 3809 | if (fs_info->nodesize > |
7a9e9987 | 3810 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || |
da17066c | 3811 | fs_info->sectorsize > PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { |
7a9e9987 SB |
3812 | /* |
3813 | * would exhaust the array bounds of pagev member in | |
3814 | * struct scrub_block | |
3815 | */ | |
5d163e0e JM |
3816 | btrfs_err(fs_info, |
3817 | "scrub: size assumption nodesize and sectorsize <= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails", | |
da17066c | 3818 | fs_info->nodesize, |
7a9e9987 | 3819 | SCRUB_MAX_PAGES_PER_BLOCK, |
da17066c | 3820 | fs_info->sectorsize, |
7a9e9987 SB |
3821 | SCRUB_MAX_PAGES_PER_BLOCK); |
3822 | return -EINVAL; | |
3823 | } | |
3824 | ||
0e94c4f4 DS |
3825 | /* Allocate outside of device_list_mutex */ |
3826 | sctx = scrub_setup_ctx(fs_info, is_dev_replace); | |
3827 | if (IS_ERR(sctx)) | |
3828 | return PTR_ERR(sctx); | |
a2de733c | 3829 | |
aa1b8cd4 | 3830 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
09ba3bc9 | 3831 | dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true); |
e6e674bd AJ |
3832 | if (!dev || (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state) && |
3833 | !is_dev_replace)) { | |
aa1b8cd4 | 3834 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
0e94c4f4 DS |
3835 | ret = -ENODEV; |
3836 | goto out_free_ctx; | |
a2de733c | 3837 | } |
a2de733c | 3838 | |
ebbede42 AJ |
3839 | if (!is_dev_replace && !readonly && |
3840 | !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state)) { | |
5d68da3b | 3841 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
672d5990 MT |
3842 | btrfs_err_in_rcu(fs_info, "scrub: device %s is not writable", |
3843 | rcu_str_deref(dev->name)); | |
0e94c4f4 DS |
3844 | ret = -EROFS; |
3845 | goto out_free_ctx; | |
5d68da3b MX |
3846 | } |
3847 | ||
3b7a016f | 3848 | mutex_lock(&fs_info->scrub_lock); |
e12c9621 | 3849 | if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) || |
401e29c1 | 3850 | test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &dev->dev_state)) { |
a2de733c | 3851 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3852 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
0e94c4f4 DS |
3853 | ret = -EIO; |
3854 | goto out_free_ctx; | |
a2de733c AJ |
3855 | } |
3856 | ||
cb5583dd | 3857 | down_read(&fs_info->dev_replace.rwsem); |
cadbc0a0 | 3858 | if (dev->scrub_ctx || |
8dabb742 SB |
3859 | (!is_dev_replace && |
3860 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { | |
cb5583dd | 3861 | up_read(&fs_info->dev_replace.rwsem); |
a2de733c | 3862 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3863 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
0e94c4f4 DS |
3864 | ret = -EINPROGRESS; |
3865 | goto out_free_ctx; | |
a2de733c | 3866 | } |
cb5583dd | 3867 | up_read(&fs_info->dev_replace.rwsem); |
3b7a016f WS |
3868 | |
3869 | ret = scrub_workers_get(fs_info, is_dev_replace); | |
3870 | if (ret) { | |
3871 | mutex_unlock(&fs_info->scrub_lock); | |
3872 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
0e94c4f4 | 3873 | goto out_free_ctx; |
3b7a016f WS |
3874 | } |
3875 | ||
d9d181c1 | 3876 | sctx->readonly = readonly; |
cadbc0a0 | 3877 | dev->scrub_ctx = sctx; |
3cb0929a | 3878 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 3879 | |
3cb0929a WS |
3880 | /* |
3881 | * checking @scrub_pause_req here, we can avoid | |
3882 | * race between committing transaction and scrubbing. | |
3883 | */ | |
cb7ab021 | 3884 | __scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3885 | atomic_inc(&fs_info->scrubs_running); |
3886 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c | 3887 | |
a5fb1142 FM |
3888 | /* |
3889 | * In order to avoid deadlock with reclaim when there is a transaction | |
3890 | * trying to pause scrub, make sure we use GFP_NOFS for all the | |
3891 | * allocations done at btrfs_scrub_pages() and scrub_pages_for_parity() | |
3892 | * invoked by our callees. The pausing request is done when the | |
3893 | * transaction commit starts, and it blocks the transaction until scrub | |
3894 | * is paused (done at specific points at scrub_stripe() or right above | |
3895 | * before incrementing fs_info->scrubs_running). | |
3896 | */ | |
3897 | nofs_flag = memalloc_nofs_save(); | |
ff023aac | 3898 | if (!is_dev_replace) { |
d1e14420 | 3899 | btrfs_info(fs_info, "scrub: started on devid %llu", devid); |
9b011adf WS |
3900 | /* |
3901 | * by holding device list mutex, we can | |
3902 | * kick off writing super in log tree sync. | |
3903 | */ | |
3cb0929a | 3904 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3905 | ret = scrub_supers(sctx, dev); |
3cb0929a | 3906 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3907 | } |
a2de733c AJ |
3908 | |
3909 | if (!ret) | |
32934280 | 3910 | ret = scrub_enumerate_chunks(sctx, dev, start, end); |
a5fb1142 | 3911 | memalloc_nofs_restore(nofs_flag); |
a2de733c | 3912 | |
b6bfebc1 | 3913 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3914 | atomic_dec(&fs_info->scrubs_running); |
3915 | wake_up(&fs_info->scrub_pause_wait); | |
3916 | ||
b6bfebc1 | 3917 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
0ef8e451 | 3918 | |
a2de733c | 3919 | if (progress) |
d9d181c1 | 3920 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
a2de733c | 3921 | |
d1e14420 AJ |
3922 | if (!is_dev_replace) |
3923 | btrfs_info(fs_info, "scrub: %s on devid %llu with status: %d", | |
3924 | ret ? "not finished" : "finished", devid, ret); | |
3925 | ||
a2de733c | 3926 | mutex_lock(&fs_info->scrub_lock); |
cadbc0a0 | 3927 | dev->scrub_ctx = NULL; |
1cec3f27 AJ |
3928 | if (--fs_info->scrub_workers_refcnt == 0) { |
3929 | scrub_workers = fs_info->scrub_workers; | |
3930 | scrub_wr_comp = fs_info->scrub_wr_completion_workers; | |
3931 | scrub_parity = fs_info->scrub_parity_workers; | |
3932 | } | |
a2de733c AJ |
3933 | mutex_unlock(&fs_info->scrub_lock); |
3934 | ||
1cec3f27 AJ |
3935 | btrfs_destroy_workqueue(scrub_workers); |
3936 | btrfs_destroy_workqueue(scrub_wr_comp); | |
3937 | btrfs_destroy_workqueue(scrub_parity); | |
f55985f4 | 3938 | scrub_put_ctx(sctx); |
a2de733c | 3939 | |
0e94c4f4 DS |
3940 | return ret; |
3941 | ||
3942 | out_free_ctx: | |
3943 | scrub_free_ctx(sctx); | |
3944 | ||
a2de733c AJ |
3945 | return ret; |
3946 | } | |
3947 | ||
2ff7e61e | 3948 | void btrfs_scrub_pause(struct btrfs_fs_info *fs_info) |
a2de733c | 3949 | { |
a2de733c AJ |
3950 | mutex_lock(&fs_info->scrub_lock); |
3951 | atomic_inc(&fs_info->scrub_pause_req); | |
3952 | while (atomic_read(&fs_info->scrubs_paused) != | |
3953 | atomic_read(&fs_info->scrubs_running)) { | |
3954 | mutex_unlock(&fs_info->scrub_lock); | |
3955 | wait_event(fs_info->scrub_pause_wait, | |
3956 | atomic_read(&fs_info->scrubs_paused) == | |
3957 | atomic_read(&fs_info->scrubs_running)); | |
3958 | mutex_lock(&fs_info->scrub_lock); | |
3959 | } | |
3960 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c AJ |
3961 | } |
3962 | ||
2ff7e61e | 3963 | void btrfs_scrub_continue(struct btrfs_fs_info *fs_info) |
a2de733c | 3964 | { |
a2de733c AJ |
3965 | atomic_dec(&fs_info->scrub_pause_req); |
3966 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
3967 | } |
3968 | ||
aa1b8cd4 | 3969 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
a2de733c | 3970 | { |
a2de733c AJ |
3971 | mutex_lock(&fs_info->scrub_lock); |
3972 | if (!atomic_read(&fs_info->scrubs_running)) { | |
3973 | mutex_unlock(&fs_info->scrub_lock); | |
3974 | return -ENOTCONN; | |
3975 | } | |
3976 | ||
3977 | atomic_inc(&fs_info->scrub_cancel_req); | |
3978 | while (atomic_read(&fs_info->scrubs_running)) { | |
3979 | mutex_unlock(&fs_info->scrub_lock); | |
3980 | wait_event(fs_info->scrub_pause_wait, | |
3981 | atomic_read(&fs_info->scrubs_running) == 0); | |
3982 | mutex_lock(&fs_info->scrub_lock); | |
3983 | } | |
3984 | atomic_dec(&fs_info->scrub_cancel_req); | |
3985 | mutex_unlock(&fs_info->scrub_lock); | |
3986 | ||
3987 | return 0; | |
3988 | } | |
3989 | ||
aa1b8cd4 SB |
3990 | int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info, |
3991 | struct btrfs_device *dev) | |
49b25e05 | 3992 | { |
d9d181c1 | 3993 | struct scrub_ctx *sctx; |
a2de733c AJ |
3994 | |
3995 | mutex_lock(&fs_info->scrub_lock); | |
cadbc0a0 | 3996 | sctx = dev->scrub_ctx; |
d9d181c1 | 3997 | if (!sctx) { |
a2de733c AJ |
3998 | mutex_unlock(&fs_info->scrub_lock); |
3999 | return -ENOTCONN; | |
4000 | } | |
d9d181c1 | 4001 | atomic_inc(&sctx->cancel_req); |
cadbc0a0 | 4002 | while (dev->scrub_ctx) { |
a2de733c AJ |
4003 | mutex_unlock(&fs_info->scrub_lock); |
4004 | wait_event(fs_info->scrub_pause_wait, | |
cadbc0a0 | 4005 | dev->scrub_ctx == NULL); |
a2de733c AJ |
4006 | mutex_lock(&fs_info->scrub_lock); |
4007 | } | |
4008 | mutex_unlock(&fs_info->scrub_lock); | |
4009 | ||
4010 | return 0; | |
4011 | } | |
1623edeb | 4012 | |
2ff7e61e | 4013 | int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid, |
a2de733c AJ |
4014 | struct btrfs_scrub_progress *progress) |
4015 | { | |
4016 | struct btrfs_device *dev; | |
d9d181c1 | 4017 | struct scrub_ctx *sctx = NULL; |
a2de733c | 4018 | |
0b246afa | 4019 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
09ba3bc9 | 4020 | dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true); |
a2de733c | 4021 | if (dev) |
cadbc0a0 | 4022 | sctx = dev->scrub_ctx; |
d9d181c1 SB |
4023 | if (sctx) |
4024 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
0b246afa | 4025 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 4026 | |
d9d181c1 | 4027 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
a2de733c | 4028 | } |
ff023aac SB |
4029 | |
4030 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
4031 | u64 extent_logical, u64 extent_len, | |
4032 | u64 *extent_physical, | |
4033 | struct btrfs_device **extent_dev, | |
4034 | int *extent_mirror_num) | |
4035 | { | |
4036 | u64 mapped_length; | |
4037 | struct btrfs_bio *bbio = NULL; | |
4038 | int ret; | |
4039 | ||
4040 | mapped_length = extent_len; | |
cf8cddd3 | 4041 | ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, extent_logical, |
ff023aac SB |
4042 | &mapped_length, &bbio, 0); |
4043 | if (ret || !bbio || mapped_length < extent_len || | |
4044 | !bbio->stripes[0].dev->bdev) { | |
6e9606d2 | 4045 | btrfs_put_bbio(bbio); |
ff023aac SB |
4046 | return; |
4047 | } | |
4048 | ||
4049 | *extent_physical = bbio->stripes[0].physical; | |
4050 | *extent_mirror_num = bbio->mirror_num; | |
4051 | *extent_dev = bbio->stripes[0].dev; | |
6e9606d2 | 4052 | btrfs_put_bbio(bbio); |
ff023aac | 4053 | } |