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Commit | Line | Data |
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a2de733c | 1 | /* |
b6bfebc1 | 2 | * Copyright (C) 2011, 2012 STRATO. All rights reserved. |
a2de733c AJ |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
a2de733c | 19 | #include <linux/blkdev.h> |
558540c1 | 20 | #include <linux/ratelimit.h> |
a2de733c AJ |
21 | #include "ctree.h" |
22 | #include "volumes.h" | |
23 | #include "disk-io.h" | |
24 | #include "ordered-data.h" | |
0ef8e451 | 25 | #include "transaction.h" |
558540c1 | 26 | #include "backref.h" |
5da6fcbc | 27 | #include "extent_io.h" |
ff023aac | 28 | #include "dev-replace.h" |
21adbd5c | 29 | #include "check-integrity.h" |
606686ee | 30 | #include "rcu-string.h" |
53b381b3 | 31 | #include "raid56.h" |
a2de733c AJ |
32 | |
33 | /* | |
34 | * This is only the first step towards a full-features scrub. It reads all | |
35 | * extent and super block and verifies the checksums. In case a bad checksum | |
36 | * is found or the extent cannot be read, good data will be written back if | |
37 | * any can be found. | |
38 | * | |
39 | * Future enhancements: | |
a2de733c AJ |
40 | * - In case an unrepairable extent is encountered, track which files are |
41 | * affected and report them | |
a2de733c | 42 | * - track and record media errors, throw out bad devices |
a2de733c | 43 | * - add a mode to also read unallocated space |
a2de733c AJ |
44 | */ |
45 | ||
b5d67f64 | 46 | struct scrub_block; |
d9d181c1 | 47 | struct scrub_ctx; |
a2de733c | 48 | |
ff023aac SB |
49 | /* |
50 | * the following three values only influence the performance. | |
51 | * The last one configures the number of parallel and outstanding I/O | |
52 | * operations. The first two values configure an upper limit for the number | |
53 | * of (dynamically allocated) pages that are added to a bio. | |
54 | */ | |
55 | #define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */ | |
56 | #define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */ | |
57 | #define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */ | |
7a9e9987 SB |
58 | |
59 | /* | |
60 | * the following value times PAGE_SIZE needs to be large enough to match the | |
61 | * largest node/leaf/sector size that shall be supported. | |
62 | * Values larger than BTRFS_STRIPE_LEN are not supported. | |
63 | */ | |
b5d67f64 | 64 | #define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */ |
a2de733c | 65 | |
af8e2d1d MX |
66 | struct scrub_recover { |
67 | atomic_t refs; | |
68 | struct btrfs_bio *bbio; | |
af8e2d1d MX |
69 | u64 map_length; |
70 | }; | |
71 | ||
a2de733c | 72 | struct scrub_page { |
b5d67f64 SB |
73 | struct scrub_block *sblock; |
74 | struct page *page; | |
442a4f63 | 75 | struct btrfs_device *dev; |
5a6ac9ea | 76 | struct list_head list; |
a2de733c AJ |
77 | u64 flags; /* extent flags */ |
78 | u64 generation; | |
b5d67f64 SB |
79 | u64 logical; |
80 | u64 physical; | |
ff023aac | 81 | u64 physical_for_dev_replace; |
57019345 | 82 | atomic_t refs; |
b5d67f64 SB |
83 | struct { |
84 | unsigned int mirror_num:8; | |
85 | unsigned int have_csum:1; | |
86 | unsigned int io_error:1; | |
87 | }; | |
a2de733c | 88 | u8 csum[BTRFS_CSUM_SIZE]; |
af8e2d1d MX |
89 | |
90 | struct scrub_recover *recover; | |
a2de733c AJ |
91 | }; |
92 | ||
93 | struct scrub_bio { | |
94 | int index; | |
d9d181c1 | 95 | struct scrub_ctx *sctx; |
a36cf8b8 | 96 | struct btrfs_device *dev; |
a2de733c AJ |
97 | struct bio *bio; |
98 | int err; | |
99 | u64 logical; | |
100 | u64 physical; | |
ff023aac SB |
101 | #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO |
102 | struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO]; | |
103 | #else | |
104 | struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO]; | |
105 | #endif | |
b5d67f64 | 106 | int page_count; |
a2de733c AJ |
107 | int next_free; |
108 | struct btrfs_work work; | |
109 | }; | |
110 | ||
b5d67f64 | 111 | struct scrub_block { |
7a9e9987 | 112 | struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK]; |
b5d67f64 SB |
113 | int page_count; |
114 | atomic_t outstanding_pages; | |
57019345 | 115 | atomic_t refs; /* free mem on transition to zero */ |
d9d181c1 | 116 | struct scrub_ctx *sctx; |
5a6ac9ea | 117 | struct scrub_parity *sparity; |
b5d67f64 SB |
118 | struct { |
119 | unsigned int header_error:1; | |
120 | unsigned int checksum_error:1; | |
121 | unsigned int no_io_error_seen:1; | |
442a4f63 | 122 | unsigned int generation_error:1; /* also sets header_error */ |
5a6ac9ea MX |
123 | |
124 | /* The following is for the data used to check parity */ | |
125 | /* It is for the data with checksum */ | |
126 | unsigned int data_corrected:1; | |
b5d67f64 | 127 | }; |
73ff61db | 128 | struct btrfs_work work; |
b5d67f64 SB |
129 | }; |
130 | ||
5a6ac9ea MX |
131 | /* Used for the chunks with parity stripe such RAID5/6 */ |
132 | struct scrub_parity { | |
133 | struct scrub_ctx *sctx; | |
134 | ||
135 | struct btrfs_device *scrub_dev; | |
136 | ||
137 | u64 logic_start; | |
138 | ||
139 | u64 logic_end; | |
140 | ||
141 | int nsectors; | |
142 | ||
143 | int stripe_len; | |
144 | ||
57019345 | 145 | atomic_t refs; |
5a6ac9ea MX |
146 | |
147 | struct list_head spages; | |
148 | ||
149 | /* Work of parity check and repair */ | |
150 | struct btrfs_work work; | |
151 | ||
152 | /* Mark the parity blocks which have data */ | |
153 | unsigned long *dbitmap; | |
154 | ||
155 | /* | |
156 | * Mark the parity blocks which have data, but errors happen when | |
157 | * read data or check data | |
158 | */ | |
159 | unsigned long *ebitmap; | |
160 | ||
161 | unsigned long bitmap[0]; | |
162 | }; | |
163 | ||
ff023aac SB |
164 | struct scrub_wr_ctx { |
165 | struct scrub_bio *wr_curr_bio; | |
166 | struct btrfs_device *tgtdev; | |
167 | int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */ | |
168 | atomic_t flush_all_writes; | |
169 | struct mutex wr_lock; | |
170 | }; | |
171 | ||
d9d181c1 | 172 | struct scrub_ctx { |
ff023aac | 173 | struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX]; |
a36cf8b8 | 174 | struct btrfs_root *dev_root; |
a2de733c AJ |
175 | int first_free; |
176 | int curr; | |
b6bfebc1 SB |
177 | atomic_t bios_in_flight; |
178 | atomic_t workers_pending; | |
a2de733c AJ |
179 | spinlock_t list_lock; |
180 | wait_queue_head_t list_wait; | |
181 | u16 csum_size; | |
182 | struct list_head csum_list; | |
183 | atomic_t cancel_req; | |
8628764e | 184 | int readonly; |
ff023aac | 185 | int pages_per_rd_bio; |
b5d67f64 SB |
186 | u32 sectorsize; |
187 | u32 nodesize; | |
63a212ab SB |
188 | |
189 | int is_dev_replace; | |
ff023aac | 190 | struct scrub_wr_ctx wr_ctx; |
63a212ab | 191 | |
a2de733c AJ |
192 | /* |
193 | * statistics | |
194 | */ | |
195 | struct btrfs_scrub_progress stat; | |
196 | spinlock_t stat_lock; | |
f55985f4 FM |
197 | |
198 | /* | |
199 | * Use a ref counter to avoid use-after-free issues. Scrub workers | |
200 | * decrement bios_in_flight and workers_pending and then do a wakeup | |
201 | * on the list_wait wait queue. We must ensure the main scrub task | |
202 | * doesn't free the scrub context before or while the workers are | |
203 | * doing the wakeup() call. | |
204 | */ | |
205 | atomic_t refs; | |
a2de733c AJ |
206 | }; |
207 | ||
0ef8e451 | 208 | struct scrub_fixup_nodatasum { |
d9d181c1 | 209 | struct scrub_ctx *sctx; |
a36cf8b8 | 210 | struct btrfs_device *dev; |
0ef8e451 JS |
211 | u64 logical; |
212 | struct btrfs_root *root; | |
213 | struct btrfs_work work; | |
214 | int mirror_num; | |
215 | }; | |
216 | ||
652f25a2 JB |
217 | struct scrub_nocow_inode { |
218 | u64 inum; | |
219 | u64 offset; | |
220 | u64 root; | |
221 | struct list_head list; | |
222 | }; | |
223 | ||
ff023aac SB |
224 | struct scrub_copy_nocow_ctx { |
225 | struct scrub_ctx *sctx; | |
226 | u64 logical; | |
227 | u64 len; | |
228 | int mirror_num; | |
229 | u64 physical_for_dev_replace; | |
652f25a2 | 230 | struct list_head inodes; |
ff023aac SB |
231 | struct btrfs_work work; |
232 | }; | |
233 | ||
558540c1 JS |
234 | struct scrub_warning { |
235 | struct btrfs_path *path; | |
236 | u64 extent_item_size; | |
558540c1 JS |
237 | const char *errstr; |
238 | sector_t sector; | |
239 | u64 logical; | |
240 | struct btrfs_device *dev; | |
558540c1 JS |
241 | }; |
242 | ||
b6bfebc1 SB |
243 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx); |
244 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx); | |
245 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx); | |
246 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx); | |
b5d67f64 | 247 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check); |
be50a8dd | 248 | static int scrub_setup_recheck_block(struct scrub_block *original_sblock, |
ff023aac | 249 | struct scrub_block *sblocks_for_recheck); |
34f5c8e9 SB |
250 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
251 | struct scrub_block *sblock, int is_metadata, | |
252 | int have_csum, u8 *csum, u64 generation, | |
af8e2d1d | 253 | u16 csum_size, int retry_failed_mirror); |
b5d67f64 SB |
254 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
255 | struct scrub_block *sblock, | |
256 | int is_metadata, int have_csum, | |
257 | const u8 *csum, u64 generation, | |
258 | u16 csum_size); | |
b5d67f64 | 259 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
114ab50d | 260 | struct scrub_block *sblock_good); |
b5d67f64 SB |
261 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, |
262 | struct scrub_block *sblock_good, | |
263 | int page_num, int force_write); | |
ff023aac SB |
264 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock); |
265 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
266 | int page_num); | |
b5d67f64 SB |
267 | static int scrub_checksum_data(struct scrub_block *sblock); |
268 | static int scrub_checksum_tree_block(struct scrub_block *sblock); | |
269 | static int scrub_checksum_super(struct scrub_block *sblock); | |
270 | static void scrub_block_get(struct scrub_block *sblock); | |
271 | static void scrub_block_put(struct scrub_block *sblock); | |
7a9e9987 SB |
272 | static void scrub_page_get(struct scrub_page *spage); |
273 | static void scrub_page_put(struct scrub_page *spage); | |
5a6ac9ea MX |
274 | static void scrub_parity_get(struct scrub_parity *sparity); |
275 | static void scrub_parity_put(struct scrub_parity *sparity); | |
ff023aac SB |
276 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
277 | struct scrub_page *spage); | |
d9d181c1 | 278 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 279 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
280 | u64 gen, int mirror_num, u8 *csum, int force, |
281 | u64 physical_for_dev_replace); | |
4246a0b6 | 282 | static void scrub_bio_end_io(struct bio *bio); |
b5d67f64 SB |
283 | static void scrub_bio_end_io_worker(struct btrfs_work *work); |
284 | static void scrub_block_complete(struct scrub_block *sblock); | |
ff023aac SB |
285 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, |
286 | u64 extent_logical, u64 extent_len, | |
287 | u64 *extent_physical, | |
288 | struct btrfs_device **extent_dev, | |
289 | int *extent_mirror_num); | |
290 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
291 | struct scrub_wr_ctx *wr_ctx, | |
292 | struct btrfs_fs_info *fs_info, | |
293 | struct btrfs_device *dev, | |
294 | int is_dev_replace); | |
295 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx); | |
296 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
297 | struct scrub_page *spage); | |
298 | static void scrub_wr_submit(struct scrub_ctx *sctx); | |
4246a0b6 | 299 | static void scrub_wr_bio_end_io(struct bio *bio); |
ff023aac SB |
300 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work); |
301 | static int write_page_nocow(struct scrub_ctx *sctx, | |
302 | u64 physical_for_dev_replace, struct page *page); | |
303 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, | |
652f25a2 | 304 | struct scrub_copy_nocow_ctx *ctx); |
ff023aac SB |
305 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
306 | int mirror_num, u64 physical_for_dev_replace); | |
307 | static void copy_nocow_pages_worker(struct btrfs_work *work); | |
cb7ab021 | 308 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
3cb0929a | 309 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
f55985f4 | 310 | static void scrub_put_ctx(struct scrub_ctx *sctx); |
1623edeb SB |
311 | |
312 | ||
b6bfebc1 SB |
313 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx) |
314 | { | |
f55985f4 | 315 | atomic_inc(&sctx->refs); |
b6bfebc1 SB |
316 | atomic_inc(&sctx->bios_in_flight); |
317 | } | |
318 | ||
319 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx) | |
320 | { | |
321 | atomic_dec(&sctx->bios_in_flight); | |
322 | wake_up(&sctx->list_wait); | |
f55985f4 | 323 | scrub_put_ctx(sctx); |
b6bfebc1 SB |
324 | } |
325 | ||
cb7ab021 | 326 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
3cb0929a WS |
327 | { |
328 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
329 | mutex_unlock(&fs_info->scrub_lock); | |
330 | wait_event(fs_info->scrub_pause_wait, | |
331 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
332 | mutex_lock(&fs_info->scrub_lock); | |
333 | } | |
334 | } | |
335 | ||
0e22be89 | 336 | static void scrub_pause_on(struct btrfs_fs_info *fs_info) |
cb7ab021 WS |
337 | { |
338 | atomic_inc(&fs_info->scrubs_paused); | |
339 | wake_up(&fs_info->scrub_pause_wait); | |
0e22be89 | 340 | } |
cb7ab021 | 341 | |
0e22be89 Z |
342 | static void scrub_pause_off(struct btrfs_fs_info *fs_info) |
343 | { | |
cb7ab021 WS |
344 | mutex_lock(&fs_info->scrub_lock); |
345 | __scrub_blocked_if_needed(fs_info); | |
346 | atomic_dec(&fs_info->scrubs_paused); | |
347 | mutex_unlock(&fs_info->scrub_lock); | |
348 | ||
349 | wake_up(&fs_info->scrub_pause_wait); | |
350 | } | |
351 | ||
0e22be89 Z |
352 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
353 | { | |
354 | scrub_pause_on(fs_info); | |
355 | scrub_pause_off(fs_info); | |
356 | } | |
357 | ||
b6bfebc1 SB |
358 | /* |
359 | * used for workers that require transaction commits (i.e., for the | |
360 | * NOCOW case) | |
361 | */ | |
362 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx) | |
363 | { | |
364 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
365 | ||
f55985f4 | 366 | atomic_inc(&sctx->refs); |
b6bfebc1 SB |
367 | /* |
368 | * increment scrubs_running to prevent cancel requests from | |
369 | * completing as long as a worker is running. we must also | |
370 | * increment scrubs_paused to prevent deadlocking on pause | |
371 | * requests used for transactions commits (as the worker uses a | |
372 | * transaction context). it is safe to regard the worker | |
373 | * as paused for all matters practical. effectively, we only | |
374 | * avoid cancellation requests from completing. | |
375 | */ | |
376 | mutex_lock(&fs_info->scrub_lock); | |
377 | atomic_inc(&fs_info->scrubs_running); | |
378 | atomic_inc(&fs_info->scrubs_paused); | |
379 | mutex_unlock(&fs_info->scrub_lock); | |
32a44789 WS |
380 | |
381 | /* | |
382 | * check if @scrubs_running=@scrubs_paused condition | |
383 | * inside wait_event() is not an atomic operation. | |
384 | * which means we may inc/dec @scrub_running/paused | |
385 | * at any time. Let's wake up @scrub_pause_wait as | |
386 | * much as we can to let commit transaction blocked less. | |
387 | */ | |
388 | wake_up(&fs_info->scrub_pause_wait); | |
389 | ||
b6bfebc1 SB |
390 | atomic_inc(&sctx->workers_pending); |
391 | } | |
392 | ||
393 | /* used for workers that require transaction commits */ | |
394 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx) | |
395 | { | |
396 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
397 | ||
398 | /* | |
399 | * see scrub_pending_trans_workers_inc() why we're pretending | |
400 | * to be paused in the scrub counters | |
401 | */ | |
402 | mutex_lock(&fs_info->scrub_lock); | |
403 | atomic_dec(&fs_info->scrubs_running); | |
404 | atomic_dec(&fs_info->scrubs_paused); | |
405 | mutex_unlock(&fs_info->scrub_lock); | |
406 | atomic_dec(&sctx->workers_pending); | |
407 | wake_up(&fs_info->scrub_pause_wait); | |
408 | wake_up(&sctx->list_wait); | |
f55985f4 | 409 | scrub_put_ctx(sctx); |
b6bfebc1 SB |
410 | } |
411 | ||
d9d181c1 | 412 | static void scrub_free_csums(struct scrub_ctx *sctx) |
a2de733c | 413 | { |
d9d181c1 | 414 | while (!list_empty(&sctx->csum_list)) { |
a2de733c | 415 | struct btrfs_ordered_sum *sum; |
d9d181c1 | 416 | sum = list_first_entry(&sctx->csum_list, |
a2de733c AJ |
417 | struct btrfs_ordered_sum, list); |
418 | list_del(&sum->list); | |
419 | kfree(sum); | |
420 | } | |
421 | } | |
422 | ||
d9d181c1 | 423 | static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) |
a2de733c AJ |
424 | { |
425 | int i; | |
a2de733c | 426 | |
d9d181c1 | 427 | if (!sctx) |
a2de733c AJ |
428 | return; |
429 | ||
ff023aac SB |
430 | scrub_free_wr_ctx(&sctx->wr_ctx); |
431 | ||
b5d67f64 | 432 | /* this can happen when scrub is cancelled */ |
d9d181c1 SB |
433 | if (sctx->curr != -1) { |
434 | struct scrub_bio *sbio = sctx->bios[sctx->curr]; | |
b5d67f64 SB |
435 | |
436 | for (i = 0; i < sbio->page_count; i++) { | |
ff023aac | 437 | WARN_ON(!sbio->pagev[i]->page); |
b5d67f64 SB |
438 | scrub_block_put(sbio->pagev[i]->sblock); |
439 | } | |
440 | bio_put(sbio->bio); | |
441 | } | |
442 | ||
ff023aac | 443 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
d9d181c1 | 444 | struct scrub_bio *sbio = sctx->bios[i]; |
a2de733c AJ |
445 | |
446 | if (!sbio) | |
447 | break; | |
a2de733c AJ |
448 | kfree(sbio); |
449 | } | |
450 | ||
d9d181c1 SB |
451 | scrub_free_csums(sctx); |
452 | kfree(sctx); | |
a2de733c AJ |
453 | } |
454 | ||
f55985f4 FM |
455 | static void scrub_put_ctx(struct scrub_ctx *sctx) |
456 | { | |
457 | if (atomic_dec_and_test(&sctx->refs)) | |
458 | scrub_free_ctx(sctx); | |
459 | } | |
460 | ||
a2de733c | 461 | static noinline_for_stack |
63a212ab | 462 | struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace) |
a2de733c | 463 | { |
d9d181c1 | 464 | struct scrub_ctx *sctx; |
a2de733c | 465 | int i; |
a2de733c | 466 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
ff023aac | 467 | int ret; |
a2de733c | 468 | |
d9d181c1 SB |
469 | sctx = kzalloc(sizeof(*sctx), GFP_NOFS); |
470 | if (!sctx) | |
a2de733c | 471 | goto nomem; |
f55985f4 | 472 | atomic_set(&sctx->refs, 1); |
63a212ab | 473 | sctx->is_dev_replace = is_dev_replace; |
b54ffb73 | 474 | sctx->pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; |
d9d181c1 | 475 | sctx->curr = -1; |
a36cf8b8 | 476 | sctx->dev_root = dev->dev_root; |
ff023aac | 477 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
a2de733c AJ |
478 | struct scrub_bio *sbio; |
479 | ||
480 | sbio = kzalloc(sizeof(*sbio), GFP_NOFS); | |
481 | if (!sbio) | |
482 | goto nomem; | |
d9d181c1 | 483 | sctx->bios[i] = sbio; |
a2de733c | 484 | |
a2de733c | 485 | sbio->index = i; |
d9d181c1 | 486 | sbio->sctx = sctx; |
b5d67f64 | 487 | sbio->page_count = 0; |
9e0af237 LB |
488 | btrfs_init_work(&sbio->work, btrfs_scrub_helper, |
489 | scrub_bio_end_io_worker, NULL, NULL); | |
a2de733c | 490 | |
ff023aac | 491 | if (i != SCRUB_BIOS_PER_SCTX - 1) |
d9d181c1 | 492 | sctx->bios[i]->next_free = i + 1; |
0ef8e451 | 493 | else |
d9d181c1 SB |
494 | sctx->bios[i]->next_free = -1; |
495 | } | |
496 | sctx->first_free = 0; | |
497 | sctx->nodesize = dev->dev_root->nodesize; | |
d9d181c1 | 498 | sctx->sectorsize = dev->dev_root->sectorsize; |
b6bfebc1 SB |
499 | atomic_set(&sctx->bios_in_flight, 0); |
500 | atomic_set(&sctx->workers_pending, 0); | |
d9d181c1 SB |
501 | atomic_set(&sctx->cancel_req, 0); |
502 | sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
503 | INIT_LIST_HEAD(&sctx->csum_list); | |
504 | ||
505 | spin_lock_init(&sctx->list_lock); | |
506 | spin_lock_init(&sctx->stat_lock); | |
507 | init_waitqueue_head(&sctx->list_wait); | |
ff023aac SB |
508 | |
509 | ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info, | |
510 | fs_info->dev_replace.tgtdev, is_dev_replace); | |
511 | if (ret) { | |
512 | scrub_free_ctx(sctx); | |
513 | return ERR_PTR(ret); | |
514 | } | |
d9d181c1 | 515 | return sctx; |
a2de733c AJ |
516 | |
517 | nomem: | |
d9d181c1 | 518 | scrub_free_ctx(sctx); |
a2de733c AJ |
519 | return ERR_PTR(-ENOMEM); |
520 | } | |
521 | ||
ff023aac SB |
522 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, |
523 | void *warn_ctx) | |
558540c1 JS |
524 | { |
525 | u64 isize; | |
526 | u32 nlink; | |
527 | int ret; | |
528 | int i; | |
529 | struct extent_buffer *eb; | |
530 | struct btrfs_inode_item *inode_item; | |
ff023aac | 531 | struct scrub_warning *swarn = warn_ctx; |
558540c1 JS |
532 | struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; |
533 | struct inode_fs_paths *ipath = NULL; | |
534 | struct btrfs_root *local_root; | |
535 | struct btrfs_key root_key; | |
1d4c08e0 | 536 | struct btrfs_key key; |
558540c1 JS |
537 | |
538 | root_key.objectid = root; | |
539 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
540 | root_key.offset = (u64)-1; | |
541 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
542 | if (IS_ERR(local_root)) { | |
543 | ret = PTR_ERR(local_root); | |
544 | goto err; | |
545 | } | |
546 | ||
14692cc1 DS |
547 | /* |
548 | * this makes the path point to (inum INODE_ITEM ioff) | |
549 | */ | |
1d4c08e0 DS |
550 | key.objectid = inum; |
551 | key.type = BTRFS_INODE_ITEM_KEY; | |
552 | key.offset = 0; | |
553 | ||
554 | ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0); | |
558540c1 JS |
555 | if (ret) { |
556 | btrfs_release_path(swarn->path); | |
557 | goto err; | |
558 | } | |
559 | ||
560 | eb = swarn->path->nodes[0]; | |
561 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], | |
562 | struct btrfs_inode_item); | |
563 | isize = btrfs_inode_size(eb, inode_item); | |
564 | nlink = btrfs_inode_nlink(eb, inode_item); | |
565 | btrfs_release_path(swarn->path); | |
566 | ||
567 | ipath = init_ipath(4096, local_root, swarn->path); | |
26bdef54 DC |
568 | if (IS_ERR(ipath)) { |
569 | ret = PTR_ERR(ipath); | |
570 | ipath = NULL; | |
571 | goto err; | |
572 | } | |
558540c1 JS |
573 | ret = paths_from_inode(inum, ipath); |
574 | ||
575 | if (ret < 0) | |
576 | goto err; | |
577 | ||
578 | /* | |
579 | * we deliberately ignore the bit ipath might have been too small to | |
580 | * hold all of the paths here | |
581 | */ | |
582 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) | |
efe120a0 | 583 | printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev " |
558540c1 JS |
584 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " |
585 | "length %llu, links %u (path: %s)\n", swarn->errstr, | |
606686ee | 586 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
587 | (unsigned long long)swarn->sector, root, inum, offset, |
588 | min(isize - offset, (u64)PAGE_SIZE), nlink, | |
745c4d8e | 589 | (char *)(unsigned long)ipath->fspath->val[i]); |
558540c1 JS |
590 | |
591 | free_ipath(ipath); | |
592 | return 0; | |
593 | ||
594 | err: | |
efe120a0 | 595 | printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev " |
558540c1 JS |
596 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " |
597 | "resolving failed with ret=%d\n", swarn->errstr, | |
606686ee | 598 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
599 | (unsigned long long)swarn->sector, root, inum, offset, ret); |
600 | ||
601 | free_ipath(ipath); | |
602 | return 0; | |
603 | } | |
604 | ||
b5d67f64 | 605 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
558540c1 | 606 | { |
a36cf8b8 SB |
607 | struct btrfs_device *dev; |
608 | struct btrfs_fs_info *fs_info; | |
558540c1 JS |
609 | struct btrfs_path *path; |
610 | struct btrfs_key found_key; | |
611 | struct extent_buffer *eb; | |
612 | struct btrfs_extent_item *ei; | |
613 | struct scrub_warning swarn; | |
69917e43 LB |
614 | unsigned long ptr = 0; |
615 | u64 extent_item_pos; | |
616 | u64 flags = 0; | |
558540c1 | 617 | u64 ref_root; |
69917e43 | 618 | u32 item_size; |
558540c1 | 619 | u8 ref_level; |
69917e43 | 620 | int ret; |
558540c1 | 621 | |
a36cf8b8 | 622 | WARN_ON(sblock->page_count < 1); |
7a9e9987 | 623 | dev = sblock->pagev[0]->dev; |
a36cf8b8 SB |
624 | fs_info = sblock->sctx->dev_root->fs_info; |
625 | ||
558540c1 | 626 | path = btrfs_alloc_path(); |
8b9456da DS |
627 | if (!path) |
628 | return; | |
558540c1 | 629 | |
7a9e9987 SB |
630 | swarn.sector = (sblock->pagev[0]->physical) >> 9; |
631 | swarn.logical = sblock->pagev[0]->logical; | |
558540c1 | 632 | swarn.errstr = errstr; |
a36cf8b8 | 633 | swarn.dev = NULL; |
558540c1 | 634 | |
69917e43 LB |
635 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, |
636 | &flags); | |
558540c1 JS |
637 | if (ret < 0) |
638 | goto out; | |
639 | ||
4692cf58 | 640 | extent_item_pos = swarn.logical - found_key.objectid; |
558540c1 JS |
641 | swarn.extent_item_size = found_key.offset; |
642 | ||
643 | eb = path->nodes[0]; | |
644 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); | |
645 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
646 | ||
69917e43 | 647 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
558540c1 | 648 | do { |
6eda71d0 LB |
649 | ret = tree_backref_for_extent(&ptr, eb, &found_key, ei, |
650 | item_size, &ref_root, | |
651 | &ref_level); | |
606686ee | 652 | printk_in_rcu(KERN_WARNING |
efe120a0 | 653 | "BTRFS: %s at logical %llu on dev %s, " |
558540c1 | 654 | "sector %llu: metadata %s (level %d) in tree " |
606686ee JB |
655 | "%llu\n", errstr, swarn.logical, |
656 | rcu_str_deref(dev->name), | |
558540c1 JS |
657 | (unsigned long long)swarn.sector, |
658 | ref_level ? "node" : "leaf", | |
659 | ret < 0 ? -1 : ref_level, | |
660 | ret < 0 ? -1 : ref_root); | |
661 | } while (ret != 1); | |
d8fe29e9 | 662 | btrfs_release_path(path); |
558540c1 | 663 | } else { |
d8fe29e9 | 664 | btrfs_release_path(path); |
558540c1 | 665 | swarn.path = path; |
a36cf8b8 | 666 | swarn.dev = dev; |
7a3ae2f8 JS |
667 | iterate_extent_inodes(fs_info, found_key.objectid, |
668 | extent_item_pos, 1, | |
558540c1 JS |
669 | scrub_print_warning_inode, &swarn); |
670 | } | |
671 | ||
672 | out: | |
673 | btrfs_free_path(path); | |
558540c1 JS |
674 | } |
675 | ||
ff023aac | 676 | static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx) |
0ef8e451 | 677 | { |
5da6fcbc | 678 | struct page *page = NULL; |
0ef8e451 | 679 | unsigned long index; |
ff023aac | 680 | struct scrub_fixup_nodatasum *fixup = fixup_ctx; |
0ef8e451 | 681 | int ret; |
5da6fcbc | 682 | int corrected = 0; |
0ef8e451 | 683 | struct btrfs_key key; |
5da6fcbc | 684 | struct inode *inode = NULL; |
6f1c3605 | 685 | struct btrfs_fs_info *fs_info; |
0ef8e451 JS |
686 | u64 end = offset + PAGE_SIZE - 1; |
687 | struct btrfs_root *local_root; | |
6f1c3605 | 688 | int srcu_index; |
0ef8e451 JS |
689 | |
690 | key.objectid = root; | |
691 | key.type = BTRFS_ROOT_ITEM_KEY; | |
692 | key.offset = (u64)-1; | |
6f1c3605 LB |
693 | |
694 | fs_info = fixup->root->fs_info; | |
695 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
696 | ||
697 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
698 | if (IS_ERR(local_root)) { | |
699 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 | 700 | return PTR_ERR(local_root); |
6f1c3605 | 701 | } |
0ef8e451 JS |
702 | |
703 | key.type = BTRFS_INODE_ITEM_KEY; | |
704 | key.objectid = inum; | |
705 | key.offset = 0; | |
6f1c3605 LB |
706 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); |
707 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 JS |
708 | if (IS_ERR(inode)) |
709 | return PTR_ERR(inode); | |
710 | ||
0ef8e451 JS |
711 | index = offset >> PAGE_CACHE_SHIFT; |
712 | ||
713 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
5da6fcbc JS |
714 | if (!page) { |
715 | ret = -ENOMEM; | |
716 | goto out; | |
717 | } | |
718 | ||
719 | if (PageUptodate(page)) { | |
5da6fcbc JS |
720 | if (PageDirty(page)) { |
721 | /* | |
722 | * we need to write the data to the defect sector. the | |
723 | * data that was in that sector is not in memory, | |
724 | * because the page was modified. we must not write the | |
725 | * modified page to that sector. | |
726 | * | |
727 | * TODO: what could be done here: wait for the delalloc | |
728 | * runner to write out that page (might involve | |
729 | * COW) and see whether the sector is still | |
730 | * referenced afterwards. | |
731 | * | |
732 | * For the meantime, we'll treat this error | |
733 | * incorrectable, although there is a chance that a | |
734 | * later scrub will find the bad sector again and that | |
735 | * there's no dirty page in memory, then. | |
736 | */ | |
737 | ret = -EIO; | |
738 | goto out; | |
739 | } | |
1203b681 | 740 | ret = repair_io_failure(inode, offset, PAGE_SIZE, |
5da6fcbc | 741 | fixup->logical, page, |
ffdd2018 | 742 | offset - page_offset(page), |
5da6fcbc JS |
743 | fixup->mirror_num); |
744 | unlock_page(page); | |
745 | corrected = !ret; | |
746 | } else { | |
747 | /* | |
748 | * we need to get good data first. the general readpage path | |
749 | * will call repair_io_failure for us, we just have to make | |
750 | * sure we read the bad mirror. | |
751 | */ | |
752 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
753 | EXTENT_DAMAGED, GFP_NOFS); | |
754 | if (ret) { | |
755 | /* set_extent_bits should give proper error */ | |
756 | WARN_ON(ret > 0); | |
757 | if (ret > 0) | |
758 | ret = -EFAULT; | |
759 | goto out; | |
760 | } | |
761 | ||
762 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, | |
763 | btrfs_get_extent, | |
764 | fixup->mirror_num); | |
765 | wait_on_page_locked(page); | |
766 | ||
767 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, | |
768 | end, EXTENT_DAMAGED, 0, NULL); | |
769 | if (!corrected) | |
770 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
771 | EXTENT_DAMAGED, GFP_NOFS); | |
772 | } | |
773 | ||
774 | out: | |
775 | if (page) | |
776 | put_page(page); | |
7fb18a06 TK |
777 | |
778 | iput(inode); | |
0ef8e451 JS |
779 | |
780 | if (ret < 0) | |
781 | return ret; | |
782 | ||
783 | if (ret == 0 && corrected) { | |
784 | /* | |
785 | * we only need to call readpage for one of the inodes belonging | |
786 | * to this extent. so make iterate_extent_inodes stop | |
787 | */ | |
788 | return 1; | |
789 | } | |
790 | ||
791 | return -EIO; | |
792 | } | |
793 | ||
794 | static void scrub_fixup_nodatasum(struct btrfs_work *work) | |
795 | { | |
796 | int ret; | |
797 | struct scrub_fixup_nodatasum *fixup; | |
d9d181c1 | 798 | struct scrub_ctx *sctx; |
0ef8e451 | 799 | struct btrfs_trans_handle *trans = NULL; |
0ef8e451 JS |
800 | struct btrfs_path *path; |
801 | int uncorrectable = 0; | |
802 | ||
803 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); | |
d9d181c1 | 804 | sctx = fixup->sctx; |
0ef8e451 JS |
805 | |
806 | path = btrfs_alloc_path(); | |
807 | if (!path) { | |
d9d181c1 SB |
808 | spin_lock(&sctx->stat_lock); |
809 | ++sctx->stat.malloc_errors; | |
810 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
811 | uncorrectable = 1; |
812 | goto out; | |
813 | } | |
814 | ||
815 | trans = btrfs_join_transaction(fixup->root); | |
816 | if (IS_ERR(trans)) { | |
817 | uncorrectable = 1; | |
818 | goto out; | |
819 | } | |
820 | ||
821 | /* | |
822 | * the idea is to trigger a regular read through the standard path. we | |
823 | * read a page from the (failed) logical address by specifying the | |
824 | * corresponding copynum of the failed sector. thus, that readpage is | |
825 | * expected to fail. | |
826 | * that is the point where on-the-fly error correction will kick in | |
827 | * (once it's finished) and rewrite the failed sector if a good copy | |
828 | * can be found. | |
829 | */ | |
830 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, | |
831 | path, scrub_fixup_readpage, | |
832 | fixup); | |
833 | if (ret < 0) { | |
834 | uncorrectable = 1; | |
835 | goto out; | |
836 | } | |
837 | WARN_ON(ret != 1); | |
838 | ||
d9d181c1 SB |
839 | spin_lock(&sctx->stat_lock); |
840 | ++sctx->stat.corrected_errors; | |
841 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
842 | |
843 | out: | |
844 | if (trans && !IS_ERR(trans)) | |
845 | btrfs_end_transaction(trans, fixup->root); | |
846 | if (uncorrectable) { | |
d9d181c1 SB |
847 | spin_lock(&sctx->stat_lock); |
848 | ++sctx->stat.uncorrectable_errors; | |
849 | spin_unlock(&sctx->stat_lock); | |
ff023aac SB |
850 | btrfs_dev_replace_stats_inc( |
851 | &sctx->dev_root->fs_info->dev_replace. | |
852 | num_uncorrectable_read_errors); | |
efe120a0 FH |
853 | printk_ratelimited_in_rcu(KERN_ERR "BTRFS: " |
854 | "unable to fixup (nodatasum) error at logical %llu on dev %s\n", | |
c1c9ff7c | 855 | fixup->logical, rcu_str_deref(fixup->dev->name)); |
0ef8e451 JS |
856 | } |
857 | ||
858 | btrfs_free_path(path); | |
859 | kfree(fixup); | |
860 | ||
b6bfebc1 | 861 | scrub_pending_trans_workers_dec(sctx); |
0ef8e451 JS |
862 | } |
863 | ||
af8e2d1d MX |
864 | static inline void scrub_get_recover(struct scrub_recover *recover) |
865 | { | |
866 | atomic_inc(&recover->refs); | |
867 | } | |
868 | ||
869 | static inline void scrub_put_recover(struct scrub_recover *recover) | |
870 | { | |
871 | if (atomic_dec_and_test(&recover->refs)) { | |
6e9606d2 | 872 | btrfs_put_bbio(recover->bbio); |
af8e2d1d MX |
873 | kfree(recover); |
874 | } | |
875 | } | |
876 | ||
a2de733c | 877 | /* |
b5d67f64 SB |
878 | * scrub_handle_errored_block gets called when either verification of the |
879 | * pages failed or the bio failed to read, e.g. with EIO. In the latter | |
880 | * case, this function handles all pages in the bio, even though only one | |
881 | * may be bad. | |
882 | * The goal of this function is to repair the errored block by using the | |
883 | * contents of one of the mirrors. | |
a2de733c | 884 | */ |
b5d67f64 | 885 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
a2de733c | 886 | { |
d9d181c1 | 887 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
a36cf8b8 | 888 | struct btrfs_device *dev; |
b5d67f64 SB |
889 | struct btrfs_fs_info *fs_info; |
890 | u64 length; | |
891 | u64 logical; | |
892 | u64 generation; | |
893 | unsigned int failed_mirror_index; | |
894 | unsigned int is_metadata; | |
895 | unsigned int have_csum; | |
896 | u8 *csum; | |
897 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ | |
898 | struct scrub_block *sblock_bad; | |
899 | int ret; | |
900 | int mirror_index; | |
901 | int page_num; | |
902 | int success; | |
558540c1 | 903 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
b5d67f64 SB |
904 | DEFAULT_RATELIMIT_BURST); |
905 | ||
906 | BUG_ON(sblock_to_check->page_count < 1); | |
a36cf8b8 | 907 | fs_info = sctx->dev_root->fs_info; |
4ded4f63 SB |
908 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
909 | /* | |
910 | * if we find an error in a super block, we just report it. | |
911 | * They will get written with the next transaction commit | |
912 | * anyway | |
913 | */ | |
914 | spin_lock(&sctx->stat_lock); | |
915 | ++sctx->stat.super_errors; | |
916 | spin_unlock(&sctx->stat_lock); | |
917 | return 0; | |
918 | } | |
b5d67f64 | 919 | length = sblock_to_check->page_count * PAGE_SIZE; |
7a9e9987 SB |
920 | logical = sblock_to_check->pagev[0]->logical; |
921 | generation = sblock_to_check->pagev[0]->generation; | |
922 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); | |
923 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; | |
924 | is_metadata = !(sblock_to_check->pagev[0]->flags & | |
b5d67f64 | 925 | BTRFS_EXTENT_FLAG_DATA); |
7a9e9987 SB |
926 | have_csum = sblock_to_check->pagev[0]->have_csum; |
927 | csum = sblock_to_check->pagev[0]->csum; | |
928 | dev = sblock_to_check->pagev[0]->dev; | |
13db62b7 | 929 | |
ff023aac SB |
930 | if (sctx->is_dev_replace && !is_metadata && !have_csum) { |
931 | sblocks_for_recheck = NULL; | |
932 | goto nodatasum_case; | |
933 | } | |
934 | ||
b5d67f64 SB |
935 | /* |
936 | * read all mirrors one after the other. This includes to | |
937 | * re-read the extent or metadata block that failed (that was | |
938 | * the cause that this fixup code is called) another time, | |
939 | * page by page this time in order to know which pages | |
940 | * caused I/O errors and which ones are good (for all mirrors). | |
941 | * It is the goal to handle the situation when more than one | |
942 | * mirror contains I/O errors, but the errors do not | |
943 | * overlap, i.e. the data can be repaired by selecting the | |
944 | * pages from those mirrors without I/O error on the | |
945 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) | |
946 | * would be that mirror #1 has an I/O error on the first page, | |
947 | * the second page is good, and mirror #2 has an I/O error on | |
948 | * the second page, but the first page is good. | |
949 | * Then the first page of the first mirror can be repaired by | |
950 | * taking the first page of the second mirror, and the | |
951 | * second page of the second mirror can be repaired by | |
952 | * copying the contents of the 2nd page of the 1st mirror. | |
953 | * One more note: if the pages of one mirror contain I/O | |
954 | * errors, the checksum cannot be verified. In order to get | |
955 | * the best data for repairing, the first attempt is to find | |
956 | * a mirror without I/O errors and with a validated checksum. | |
957 | * Only if this is not possible, the pages are picked from | |
958 | * mirrors with I/O errors without considering the checksum. | |
959 | * If the latter is the case, at the end, the checksum of the | |
960 | * repaired area is verified in order to correctly maintain | |
961 | * the statistics. | |
962 | */ | |
963 | ||
31e818fe DS |
964 | sblocks_for_recheck = kcalloc(BTRFS_MAX_MIRRORS, |
965 | sizeof(*sblocks_for_recheck), GFP_NOFS); | |
b5d67f64 | 966 | if (!sblocks_for_recheck) { |
d9d181c1 SB |
967 | spin_lock(&sctx->stat_lock); |
968 | sctx->stat.malloc_errors++; | |
969 | sctx->stat.read_errors++; | |
970 | sctx->stat.uncorrectable_errors++; | |
971 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 972 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 973 | goto out; |
a2de733c AJ |
974 | } |
975 | ||
b5d67f64 | 976 | /* setup the context, map the logical blocks and alloc the pages */ |
be50a8dd | 977 | ret = scrub_setup_recheck_block(sblock_to_check, sblocks_for_recheck); |
b5d67f64 | 978 | if (ret) { |
d9d181c1 SB |
979 | spin_lock(&sctx->stat_lock); |
980 | sctx->stat.read_errors++; | |
981 | sctx->stat.uncorrectable_errors++; | |
982 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 983 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 SB |
984 | goto out; |
985 | } | |
986 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); | |
987 | sblock_bad = sblocks_for_recheck + failed_mirror_index; | |
13db62b7 | 988 | |
b5d67f64 | 989 | /* build and submit the bios for the failed mirror, check checksums */ |
34f5c8e9 | 990 | scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum, |
af8e2d1d | 991 | csum, generation, sctx->csum_size, 1); |
a2de733c | 992 | |
b5d67f64 SB |
993 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
994 | sblock_bad->no_io_error_seen) { | |
995 | /* | |
996 | * the error disappeared after reading page by page, or | |
997 | * the area was part of a huge bio and other parts of the | |
998 | * bio caused I/O errors, or the block layer merged several | |
999 | * read requests into one and the error is caused by a | |
1000 | * different bio (usually one of the two latter cases is | |
1001 | * the cause) | |
1002 | */ | |
d9d181c1 SB |
1003 | spin_lock(&sctx->stat_lock); |
1004 | sctx->stat.unverified_errors++; | |
5a6ac9ea | 1005 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 1006 | spin_unlock(&sctx->stat_lock); |
a2de733c | 1007 | |
ff023aac SB |
1008 | if (sctx->is_dev_replace) |
1009 | scrub_write_block_to_dev_replace(sblock_bad); | |
b5d67f64 | 1010 | goto out; |
a2de733c | 1011 | } |
a2de733c | 1012 | |
b5d67f64 | 1013 | if (!sblock_bad->no_io_error_seen) { |
d9d181c1 SB |
1014 | spin_lock(&sctx->stat_lock); |
1015 | sctx->stat.read_errors++; | |
1016 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
1017 | if (__ratelimit(&_rs)) |
1018 | scrub_print_warning("i/o error", sblock_to_check); | |
a36cf8b8 | 1019 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 1020 | } else if (sblock_bad->checksum_error) { |
d9d181c1 SB |
1021 | spin_lock(&sctx->stat_lock); |
1022 | sctx->stat.csum_errors++; | |
1023 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
1024 | if (__ratelimit(&_rs)) |
1025 | scrub_print_warning("checksum error", sblock_to_check); | |
a36cf8b8 | 1026 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 1027 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 1028 | } else if (sblock_bad->header_error) { |
d9d181c1 SB |
1029 | spin_lock(&sctx->stat_lock); |
1030 | sctx->stat.verify_errors++; | |
1031 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
1032 | if (__ratelimit(&_rs)) |
1033 | scrub_print_warning("checksum/header error", | |
1034 | sblock_to_check); | |
442a4f63 | 1035 | if (sblock_bad->generation_error) |
a36cf8b8 | 1036 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 SB |
1037 | BTRFS_DEV_STAT_GENERATION_ERRS); |
1038 | else | |
a36cf8b8 | 1039 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 1040 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 1041 | } |
a2de733c | 1042 | |
33ef30ad ID |
1043 | if (sctx->readonly) { |
1044 | ASSERT(!sctx->is_dev_replace); | |
1045 | goto out; | |
1046 | } | |
a2de733c | 1047 | |
b5d67f64 SB |
1048 | if (!is_metadata && !have_csum) { |
1049 | struct scrub_fixup_nodatasum *fixup_nodatasum; | |
a2de733c | 1050 | |
ff023aac SB |
1051 | WARN_ON(sctx->is_dev_replace); |
1052 | ||
b25c94c5 ZL |
1053 | nodatasum_case: |
1054 | ||
b5d67f64 SB |
1055 | /* |
1056 | * !is_metadata and !have_csum, this means that the data | |
1057 | * might not be COW'ed, that it might be modified | |
1058 | * concurrently. The general strategy to work on the | |
1059 | * commit root does not help in the case when COW is not | |
1060 | * used. | |
1061 | */ | |
1062 | fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS); | |
1063 | if (!fixup_nodatasum) | |
1064 | goto did_not_correct_error; | |
d9d181c1 | 1065 | fixup_nodatasum->sctx = sctx; |
a36cf8b8 | 1066 | fixup_nodatasum->dev = dev; |
b5d67f64 SB |
1067 | fixup_nodatasum->logical = logical; |
1068 | fixup_nodatasum->root = fs_info->extent_root; | |
1069 | fixup_nodatasum->mirror_num = failed_mirror_index + 1; | |
b6bfebc1 | 1070 | scrub_pending_trans_workers_inc(sctx); |
9e0af237 LB |
1071 | btrfs_init_work(&fixup_nodatasum->work, btrfs_scrub_helper, |
1072 | scrub_fixup_nodatasum, NULL, NULL); | |
0339ef2f QW |
1073 | btrfs_queue_work(fs_info->scrub_workers, |
1074 | &fixup_nodatasum->work); | |
b5d67f64 | 1075 | goto out; |
a2de733c AJ |
1076 | } |
1077 | ||
b5d67f64 SB |
1078 | /* |
1079 | * now build and submit the bios for the other mirrors, check | |
cb2ced73 SB |
1080 | * checksums. |
1081 | * First try to pick the mirror which is completely without I/O | |
b5d67f64 SB |
1082 | * errors and also does not have a checksum error. |
1083 | * If one is found, and if a checksum is present, the full block | |
1084 | * that is known to contain an error is rewritten. Afterwards | |
1085 | * the block is known to be corrected. | |
1086 | * If a mirror is found which is completely correct, and no | |
1087 | * checksum is present, only those pages are rewritten that had | |
1088 | * an I/O error in the block to be repaired, since it cannot be | |
1089 | * determined, which copy of the other pages is better (and it | |
1090 | * could happen otherwise that a correct page would be | |
1091 | * overwritten by a bad one). | |
1092 | */ | |
1093 | for (mirror_index = 0; | |
1094 | mirror_index < BTRFS_MAX_MIRRORS && | |
1095 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1096 | mirror_index++) { | |
cb2ced73 | 1097 | struct scrub_block *sblock_other; |
b5d67f64 | 1098 | |
cb2ced73 SB |
1099 | if (mirror_index == failed_mirror_index) |
1100 | continue; | |
1101 | sblock_other = sblocks_for_recheck + mirror_index; | |
1102 | ||
1103 | /* build and submit the bios, check checksums */ | |
34f5c8e9 SB |
1104 | scrub_recheck_block(fs_info, sblock_other, is_metadata, |
1105 | have_csum, csum, generation, | |
af8e2d1d | 1106 | sctx->csum_size, 0); |
34f5c8e9 SB |
1107 | |
1108 | if (!sblock_other->header_error && | |
b5d67f64 SB |
1109 | !sblock_other->checksum_error && |
1110 | sblock_other->no_io_error_seen) { | |
ff023aac SB |
1111 | if (sctx->is_dev_replace) { |
1112 | scrub_write_block_to_dev_replace(sblock_other); | |
114ab50d | 1113 | goto corrected_error; |
ff023aac | 1114 | } else { |
ff023aac | 1115 | ret = scrub_repair_block_from_good_copy( |
114ab50d ZL |
1116 | sblock_bad, sblock_other); |
1117 | if (!ret) | |
1118 | goto corrected_error; | |
ff023aac | 1119 | } |
b5d67f64 SB |
1120 | } |
1121 | } | |
a2de733c | 1122 | |
b968fed1 ZL |
1123 | if (sblock_bad->no_io_error_seen && !sctx->is_dev_replace) |
1124 | goto did_not_correct_error; | |
ff023aac SB |
1125 | |
1126 | /* | |
ff023aac | 1127 | * In case of I/O errors in the area that is supposed to be |
b5d67f64 SB |
1128 | * repaired, continue by picking good copies of those pages. |
1129 | * Select the good pages from mirrors to rewrite bad pages from | |
1130 | * the area to fix. Afterwards verify the checksum of the block | |
1131 | * that is supposed to be repaired. This verification step is | |
1132 | * only done for the purpose of statistic counting and for the | |
1133 | * final scrub report, whether errors remain. | |
1134 | * A perfect algorithm could make use of the checksum and try | |
1135 | * all possible combinations of pages from the different mirrors | |
1136 | * until the checksum verification succeeds. For example, when | |
1137 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page | |
1138 | * of mirror #2 is readable but the final checksum test fails, | |
1139 | * then the 2nd page of mirror #3 could be tried, whether now | |
1140 | * the final checksum succeedes. But this would be a rare | |
1141 | * exception and is therefore not implemented. At least it is | |
1142 | * avoided that the good copy is overwritten. | |
1143 | * A more useful improvement would be to pick the sectors | |
1144 | * without I/O error based on sector sizes (512 bytes on legacy | |
1145 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one | |
1146 | * mirror could be repaired by taking 512 byte of a different | |
1147 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE | |
1148 | * area are unreadable. | |
a2de733c | 1149 | */ |
b5d67f64 | 1150 | success = 1; |
b968fed1 ZL |
1151 | for (page_num = 0; page_num < sblock_bad->page_count; |
1152 | page_num++) { | |
7a9e9987 | 1153 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
b968fed1 | 1154 | struct scrub_block *sblock_other = NULL; |
b5d67f64 | 1155 | |
b968fed1 ZL |
1156 | /* skip no-io-error page in scrub */ |
1157 | if (!page_bad->io_error && !sctx->is_dev_replace) | |
a2de733c | 1158 | continue; |
b5d67f64 | 1159 | |
b968fed1 ZL |
1160 | /* try to find no-io-error page in mirrors */ |
1161 | if (page_bad->io_error) { | |
1162 | for (mirror_index = 0; | |
1163 | mirror_index < BTRFS_MAX_MIRRORS && | |
1164 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1165 | mirror_index++) { | |
1166 | if (!sblocks_for_recheck[mirror_index]. | |
1167 | pagev[page_num]->io_error) { | |
1168 | sblock_other = sblocks_for_recheck + | |
1169 | mirror_index; | |
1170 | break; | |
b5d67f64 SB |
1171 | } |
1172 | } | |
b968fed1 ZL |
1173 | if (!sblock_other) |
1174 | success = 0; | |
96e36920 | 1175 | } |
a2de733c | 1176 | |
b968fed1 ZL |
1177 | if (sctx->is_dev_replace) { |
1178 | /* | |
1179 | * did not find a mirror to fetch the page | |
1180 | * from. scrub_write_page_to_dev_replace() | |
1181 | * handles this case (page->io_error), by | |
1182 | * filling the block with zeros before | |
1183 | * submitting the write request | |
1184 | */ | |
1185 | if (!sblock_other) | |
1186 | sblock_other = sblock_bad; | |
1187 | ||
1188 | if (scrub_write_page_to_dev_replace(sblock_other, | |
1189 | page_num) != 0) { | |
1190 | btrfs_dev_replace_stats_inc( | |
1191 | &sctx->dev_root-> | |
1192 | fs_info->dev_replace. | |
1193 | num_write_errors); | |
1194 | success = 0; | |
1195 | } | |
1196 | } else if (sblock_other) { | |
1197 | ret = scrub_repair_page_from_good_copy(sblock_bad, | |
1198 | sblock_other, | |
1199 | page_num, 0); | |
1200 | if (0 == ret) | |
1201 | page_bad->io_error = 0; | |
1202 | else | |
1203 | success = 0; | |
b5d67f64 | 1204 | } |
a2de733c | 1205 | } |
a2de733c | 1206 | |
b968fed1 | 1207 | if (success && !sctx->is_dev_replace) { |
b5d67f64 SB |
1208 | if (is_metadata || have_csum) { |
1209 | /* | |
1210 | * need to verify the checksum now that all | |
1211 | * sectors on disk are repaired (the write | |
1212 | * request for data to be repaired is on its way). | |
1213 | * Just be lazy and use scrub_recheck_block() | |
1214 | * which re-reads the data before the checksum | |
1215 | * is verified, but most likely the data comes out | |
1216 | * of the page cache. | |
1217 | */ | |
34f5c8e9 SB |
1218 | scrub_recheck_block(fs_info, sblock_bad, |
1219 | is_metadata, have_csum, csum, | |
af8e2d1d | 1220 | generation, sctx->csum_size, 1); |
34f5c8e9 | 1221 | if (!sblock_bad->header_error && |
b5d67f64 SB |
1222 | !sblock_bad->checksum_error && |
1223 | sblock_bad->no_io_error_seen) | |
1224 | goto corrected_error; | |
1225 | else | |
1226 | goto did_not_correct_error; | |
1227 | } else { | |
1228 | corrected_error: | |
d9d181c1 SB |
1229 | spin_lock(&sctx->stat_lock); |
1230 | sctx->stat.corrected_errors++; | |
5a6ac9ea | 1231 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 1232 | spin_unlock(&sctx->stat_lock); |
606686ee | 1233 | printk_ratelimited_in_rcu(KERN_ERR |
efe120a0 | 1234 | "BTRFS: fixed up error at logical %llu on dev %s\n", |
c1c9ff7c | 1235 | logical, rcu_str_deref(dev->name)); |
8628764e | 1236 | } |
b5d67f64 SB |
1237 | } else { |
1238 | did_not_correct_error: | |
d9d181c1 SB |
1239 | spin_lock(&sctx->stat_lock); |
1240 | sctx->stat.uncorrectable_errors++; | |
1241 | spin_unlock(&sctx->stat_lock); | |
606686ee | 1242 | printk_ratelimited_in_rcu(KERN_ERR |
efe120a0 | 1243 | "BTRFS: unable to fixup (regular) error at logical %llu on dev %s\n", |
c1c9ff7c | 1244 | logical, rcu_str_deref(dev->name)); |
96e36920 | 1245 | } |
a2de733c | 1246 | |
b5d67f64 SB |
1247 | out: |
1248 | if (sblocks_for_recheck) { | |
1249 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; | |
1250 | mirror_index++) { | |
1251 | struct scrub_block *sblock = sblocks_for_recheck + | |
1252 | mirror_index; | |
af8e2d1d | 1253 | struct scrub_recover *recover; |
b5d67f64 SB |
1254 | int page_index; |
1255 | ||
7a9e9987 SB |
1256 | for (page_index = 0; page_index < sblock->page_count; |
1257 | page_index++) { | |
1258 | sblock->pagev[page_index]->sblock = NULL; | |
af8e2d1d MX |
1259 | recover = sblock->pagev[page_index]->recover; |
1260 | if (recover) { | |
1261 | scrub_put_recover(recover); | |
1262 | sblock->pagev[page_index]->recover = | |
1263 | NULL; | |
1264 | } | |
7a9e9987 SB |
1265 | scrub_page_put(sblock->pagev[page_index]); |
1266 | } | |
b5d67f64 SB |
1267 | } |
1268 | kfree(sblocks_for_recheck); | |
1269 | } | |
a2de733c | 1270 | |
b5d67f64 SB |
1271 | return 0; |
1272 | } | |
a2de733c | 1273 | |
8e5cfb55 | 1274 | static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio) |
af8e2d1d | 1275 | { |
10f11900 ZL |
1276 | if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5) |
1277 | return 2; | |
1278 | else if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID6) | |
1279 | return 3; | |
1280 | else | |
af8e2d1d | 1281 | return (int)bbio->num_stripes; |
af8e2d1d MX |
1282 | } |
1283 | ||
10f11900 ZL |
1284 | static inline void scrub_stripe_index_and_offset(u64 logical, u64 map_type, |
1285 | u64 *raid_map, | |
af8e2d1d MX |
1286 | u64 mapped_length, |
1287 | int nstripes, int mirror, | |
1288 | int *stripe_index, | |
1289 | u64 *stripe_offset) | |
1290 | { | |
1291 | int i; | |
1292 | ||
ffe2d203 | 1293 | if (map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
af8e2d1d MX |
1294 | /* RAID5/6 */ |
1295 | for (i = 0; i < nstripes; i++) { | |
1296 | if (raid_map[i] == RAID6_Q_STRIPE || | |
1297 | raid_map[i] == RAID5_P_STRIPE) | |
1298 | continue; | |
1299 | ||
1300 | if (logical >= raid_map[i] && | |
1301 | logical < raid_map[i] + mapped_length) | |
1302 | break; | |
1303 | } | |
1304 | ||
1305 | *stripe_index = i; | |
1306 | *stripe_offset = logical - raid_map[i]; | |
1307 | } else { | |
1308 | /* The other RAID type */ | |
1309 | *stripe_index = mirror; | |
1310 | *stripe_offset = 0; | |
1311 | } | |
1312 | } | |
1313 | ||
be50a8dd | 1314 | static int scrub_setup_recheck_block(struct scrub_block *original_sblock, |
b5d67f64 SB |
1315 | struct scrub_block *sblocks_for_recheck) |
1316 | { | |
be50a8dd ZL |
1317 | struct scrub_ctx *sctx = original_sblock->sctx; |
1318 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
1319 | u64 length = original_sblock->page_count * PAGE_SIZE; | |
1320 | u64 logical = original_sblock->pagev[0]->logical; | |
af8e2d1d MX |
1321 | struct scrub_recover *recover; |
1322 | struct btrfs_bio *bbio; | |
af8e2d1d MX |
1323 | u64 sublen; |
1324 | u64 mapped_length; | |
1325 | u64 stripe_offset; | |
1326 | int stripe_index; | |
be50a8dd | 1327 | int page_index = 0; |
b5d67f64 | 1328 | int mirror_index; |
af8e2d1d | 1329 | int nmirrors; |
b5d67f64 SB |
1330 | int ret; |
1331 | ||
1332 | /* | |
57019345 | 1333 | * note: the two members refs and outstanding_pages |
b5d67f64 SB |
1334 | * are not used (and not set) in the blocks that are used for |
1335 | * the recheck procedure | |
1336 | */ | |
1337 | ||
b5d67f64 | 1338 | while (length > 0) { |
af8e2d1d MX |
1339 | sublen = min_t(u64, length, PAGE_SIZE); |
1340 | mapped_length = sublen; | |
1341 | bbio = NULL; | |
a2de733c | 1342 | |
b5d67f64 SB |
1343 | /* |
1344 | * with a length of PAGE_SIZE, each returned stripe | |
1345 | * represents one mirror | |
1346 | */ | |
af8e2d1d | 1347 | ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical, |
8e5cfb55 | 1348 | &mapped_length, &bbio, 0, 1); |
b5d67f64 | 1349 | if (ret || !bbio || mapped_length < sublen) { |
6e9606d2 | 1350 | btrfs_put_bbio(bbio); |
b5d67f64 SB |
1351 | return -EIO; |
1352 | } | |
a2de733c | 1353 | |
af8e2d1d MX |
1354 | recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS); |
1355 | if (!recover) { | |
6e9606d2 | 1356 | btrfs_put_bbio(bbio); |
af8e2d1d MX |
1357 | return -ENOMEM; |
1358 | } | |
1359 | ||
1360 | atomic_set(&recover->refs, 1); | |
1361 | recover->bbio = bbio; | |
af8e2d1d MX |
1362 | recover->map_length = mapped_length; |
1363 | ||
ff023aac | 1364 | BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO); |
af8e2d1d | 1365 | |
be50a8dd | 1366 | nmirrors = min(scrub_nr_raid_mirrors(bbio), BTRFS_MAX_MIRRORS); |
10f11900 | 1367 | |
af8e2d1d | 1368 | for (mirror_index = 0; mirror_index < nmirrors; |
b5d67f64 SB |
1369 | mirror_index++) { |
1370 | struct scrub_block *sblock; | |
1371 | struct scrub_page *page; | |
1372 | ||
b5d67f64 | 1373 | sblock = sblocks_for_recheck + mirror_index; |
7a9e9987 SB |
1374 | sblock->sctx = sctx; |
1375 | page = kzalloc(sizeof(*page), GFP_NOFS); | |
1376 | if (!page) { | |
1377 | leave_nomem: | |
d9d181c1 SB |
1378 | spin_lock(&sctx->stat_lock); |
1379 | sctx->stat.malloc_errors++; | |
1380 | spin_unlock(&sctx->stat_lock); | |
af8e2d1d | 1381 | scrub_put_recover(recover); |
b5d67f64 SB |
1382 | return -ENOMEM; |
1383 | } | |
7a9e9987 SB |
1384 | scrub_page_get(page); |
1385 | sblock->pagev[page_index] = page; | |
1386 | page->logical = logical; | |
af8e2d1d | 1387 | |
10f11900 ZL |
1388 | scrub_stripe_index_and_offset(logical, |
1389 | bbio->map_type, | |
1390 | bbio->raid_map, | |
af8e2d1d | 1391 | mapped_length, |
e34c330d ZL |
1392 | bbio->num_stripes - |
1393 | bbio->num_tgtdevs, | |
af8e2d1d MX |
1394 | mirror_index, |
1395 | &stripe_index, | |
1396 | &stripe_offset); | |
1397 | page->physical = bbio->stripes[stripe_index].physical + | |
1398 | stripe_offset; | |
1399 | page->dev = bbio->stripes[stripe_index].dev; | |
1400 | ||
ff023aac SB |
1401 | BUG_ON(page_index >= original_sblock->page_count); |
1402 | page->physical_for_dev_replace = | |
1403 | original_sblock->pagev[page_index]-> | |
1404 | physical_for_dev_replace; | |
7a9e9987 | 1405 | /* for missing devices, dev->bdev is NULL */ |
7a9e9987 | 1406 | page->mirror_num = mirror_index + 1; |
b5d67f64 | 1407 | sblock->page_count++; |
7a9e9987 SB |
1408 | page->page = alloc_page(GFP_NOFS); |
1409 | if (!page->page) | |
1410 | goto leave_nomem; | |
af8e2d1d MX |
1411 | |
1412 | scrub_get_recover(recover); | |
1413 | page->recover = recover; | |
b5d67f64 | 1414 | } |
af8e2d1d | 1415 | scrub_put_recover(recover); |
b5d67f64 SB |
1416 | length -= sublen; |
1417 | logical += sublen; | |
1418 | page_index++; | |
1419 | } | |
1420 | ||
1421 | return 0; | |
96e36920 ID |
1422 | } |
1423 | ||
af8e2d1d MX |
1424 | struct scrub_bio_ret { |
1425 | struct completion event; | |
1426 | int error; | |
1427 | }; | |
1428 | ||
4246a0b6 | 1429 | static void scrub_bio_wait_endio(struct bio *bio) |
af8e2d1d MX |
1430 | { |
1431 | struct scrub_bio_ret *ret = bio->bi_private; | |
1432 | ||
4246a0b6 | 1433 | ret->error = bio->bi_error; |
af8e2d1d MX |
1434 | complete(&ret->event); |
1435 | } | |
1436 | ||
1437 | static inline int scrub_is_page_on_raid56(struct scrub_page *page) | |
1438 | { | |
10f11900 | 1439 | return page->recover && |
ffe2d203 | 1440 | (page->recover->bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK); |
af8e2d1d MX |
1441 | } |
1442 | ||
1443 | static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info, | |
1444 | struct bio *bio, | |
1445 | struct scrub_page *page) | |
1446 | { | |
1447 | struct scrub_bio_ret done; | |
1448 | int ret; | |
1449 | ||
1450 | init_completion(&done.event); | |
1451 | done.error = 0; | |
1452 | bio->bi_iter.bi_sector = page->logical >> 9; | |
1453 | bio->bi_private = &done; | |
1454 | bio->bi_end_io = scrub_bio_wait_endio; | |
1455 | ||
1456 | ret = raid56_parity_recover(fs_info->fs_root, bio, page->recover->bbio, | |
af8e2d1d | 1457 | page->recover->map_length, |
4245215d | 1458 | page->mirror_num, 0); |
af8e2d1d MX |
1459 | if (ret) |
1460 | return ret; | |
1461 | ||
1462 | wait_for_completion(&done.event); | |
1463 | if (done.error) | |
1464 | return -EIO; | |
1465 | ||
1466 | return 0; | |
1467 | } | |
1468 | ||
b5d67f64 SB |
1469 | /* |
1470 | * this function will check the on disk data for checksum errors, header | |
1471 | * errors and read I/O errors. If any I/O errors happen, the exact pages | |
1472 | * which are errored are marked as being bad. The goal is to enable scrub | |
1473 | * to take those pages that are not errored from all the mirrors so that | |
1474 | * the pages that are errored in the just handled mirror can be repaired. | |
1475 | */ | |
34f5c8e9 SB |
1476 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
1477 | struct scrub_block *sblock, int is_metadata, | |
1478 | int have_csum, u8 *csum, u64 generation, | |
af8e2d1d | 1479 | u16 csum_size, int retry_failed_mirror) |
96e36920 | 1480 | { |
b5d67f64 | 1481 | int page_num; |
96e36920 | 1482 | |
b5d67f64 SB |
1483 | sblock->no_io_error_seen = 1; |
1484 | sblock->header_error = 0; | |
1485 | sblock->checksum_error = 0; | |
96e36920 | 1486 | |
b5d67f64 SB |
1487 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1488 | struct bio *bio; | |
7a9e9987 | 1489 | struct scrub_page *page = sblock->pagev[page_num]; |
b5d67f64 | 1490 | |
442a4f63 | 1491 | if (page->dev->bdev == NULL) { |
ea9947b4 SB |
1492 | page->io_error = 1; |
1493 | sblock->no_io_error_seen = 0; | |
1494 | continue; | |
1495 | } | |
1496 | ||
7a9e9987 | 1497 | WARN_ON(!page->page); |
9be3395b | 1498 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
34f5c8e9 SB |
1499 | if (!bio) { |
1500 | page->io_error = 1; | |
1501 | sblock->no_io_error_seen = 0; | |
1502 | continue; | |
1503 | } | |
442a4f63 | 1504 | bio->bi_bdev = page->dev->bdev; |
b5d67f64 | 1505 | |
34f5c8e9 | 1506 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
af8e2d1d MX |
1507 | if (!retry_failed_mirror && scrub_is_page_on_raid56(page)) { |
1508 | if (scrub_submit_raid56_bio_wait(fs_info, bio, page)) | |
1509 | sblock->no_io_error_seen = 0; | |
1510 | } else { | |
1511 | bio->bi_iter.bi_sector = page->physical >> 9; | |
1512 | ||
1513 | if (btrfsic_submit_bio_wait(READ, bio)) | |
1514 | sblock->no_io_error_seen = 0; | |
1515 | } | |
33879d45 | 1516 | |
b5d67f64 SB |
1517 | bio_put(bio); |
1518 | } | |
96e36920 | 1519 | |
b5d67f64 SB |
1520 | if (sblock->no_io_error_seen) |
1521 | scrub_recheck_block_checksum(fs_info, sblock, is_metadata, | |
1522 | have_csum, csum, generation, | |
1523 | csum_size); | |
1524 | ||
34f5c8e9 | 1525 | return; |
a2de733c AJ |
1526 | } |
1527 | ||
17a9be2f MX |
1528 | static inline int scrub_check_fsid(u8 fsid[], |
1529 | struct scrub_page *spage) | |
1530 | { | |
1531 | struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices; | |
1532 | int ret; | |
1533 | ||
1534 | ret = memcmp(fsid, fs_devices->fsid, BTRFS_UUID_SIZE); | |
1535 | return !ret; | |
1536 | } | |
1537 | ||
b5d67f64 SB |
1538 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
1539 | struct scrub_block *sblock, | |
1540 | int is_metadata, int have_csum, | |
1541 | const u8 *csum, u64 generation, | |
1542 | u16 csum_size) | |
a2de733c | 1543 | { |
b5d67f64 SB |
1544 | int page_num; |
1545 | u8 calculated_csum[BTRFS_CSUM_SIZE]; | |
1546 | u32 crc = ~(u32)0; | |
b5d67f64 SB |
1547 | void *mapped_buffer; |
1548 | ||
7a9e9987 | 1549 | WARN_ON(!sblock->pagev[0]->page); |
b5d67f64 SB |
1550 | if (is_metadata) { |
1551 | struct btrfs_header *h; | |
1552 | ||
7a9e9987 | 1553 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 SB |
1554 | h = (struct btrfs_header *)mapped_buffer; |
1555 | ||
3cae210f | 1556 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h) || |
17a9be2f | 1557 | !scrub_check_fsid(h->fsid, sblock->pagev[0]) || |
b5d67f64 | 1558 | memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, |
442a4f63 | 1559 | BTRFS_UUID_SIZE)) { |
b5d67f64 | 1560 | sblock->header_error = 1; |
3cae210f | 1561 | } else if (generation != btrfs_stack_header_generation(h)) { |
442a4f63 SB |
1562 | sblock->header_error = 1; |
1563 | sblock->generation_error = 1; | |
1564 | } | |
b5d67f64 SB |
1565 | csum = h->csum; |
1566 | } else { | |
1567 | if (!have_csum) | |
1568 | return; | |
a2de733c | 1569 | |
7a9e9987 | 1570 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 | 1571 | } |
a2de733c | 1572 | |
b5d67f64 SB |
1573 | for (page_num = 0;;) { |
1574 | if (page_num == 0 && is_metadata) | |
b0496686 | 1575 | crc = btrfs_csum_data( |
b5d67f64 SB |
1576 | ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE, |
1577 | crc, PAGE_SIZE - BTRFS_CSUM_SIZE); | |
1578 | else | |
b0496686 | 1579 | crc = btrfs_csum_data(mapped_buffer, crc, PAGE_SIZE); |
b5d67f64 | 1580 | |
9613bebb | 1581 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1582 | page_num++; |
1583 | if (page_num >= sblock->page_count) | |
1584 | break; | |
7a9e9987 | 1585 | WARN_ON(!sblock->pagev[page_num]->page); |
b5d67f64 | 1586 | |
7a9e9987 | 1587 | mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page); |
b5d67f64 SB |
1588 | } |
1589 | ||
1590 | btrfs_csum_final(crc, calculated_csum); | |
1591 | if (memcmp(calculated_csum, csum, csum_size)) | |
1592 | sblock->checksum_error = 1; | |
a2de733c AJ |
1593 | } |
1594 | ||
b5d67f64 | 1595 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
114ab50d | 1596 | struct scrub_block *sblock_good) |
b5d67f64 SB |
1597 | { |
1598 | int page_num; | |
1599 | int ret = 0; | |
96e36920 | 1600 | |
b5d67f64 SB |
1601 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
1602 | int ret_sub; | |
96e36920 | 1603 | |
b5d67f64 SB |
1604 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
1605 | sblock_good, | |
114ab50d | 1606 | page_num, 1); |
b5d67f64 SB |
1607 | if (ret_sub) |
1608 | ret = ret_sub; | |
a2de733c | 1609 | } |
b5d67f64 SB |
1610 | |
1611 | return ret; | |
1612 | } | |
1613 | ||
1614 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
1615 | struct scrub_block *sblock_good, | |
1616 | int page_num, int force_write) | |
1617 | { | |
7a9e9987 SB |
1618 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
1619 | struct scrub_page *page_good = sblock_good->pagev[page_num]; | |
b5d67f64 | 1620 | |
7a9e9987 SB |
1621 | BUG_ON(page_bad->page == NULL); |
1622 | BUG_ON(page_good->page == NULL); | |
b5d67f64 SB |
1623 | if (force_write || sblock_bad->header_error || |
1624 | sblock_bad->checksum_error || page_bad->io_error) { | |
1625 | struct bio *bio; | |
1626 | int ret; | |
b5d67f64 | 1627 | |
ff023aac | 1628 | if (!page_bad->dev->bdev) { |
efe120a0 FH |
1629 | printk_ratelimited(KERN_WARNING "BTRFS: " |
1630 | "scrub_repair_page_from_good_copy(bdev == NULL) " | |
1631 | "is unexpected!\n"); | |
ff023aac SB |
1632 | return -EIO; |
1633 | } | |
1634 | ||
9be3395b | 1635 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
e627ee7b TI |
1636 | if (!bio) |
1637 | return -EIO; | |
442a4f63 | 1638 | bio->bi_bdev = page_bad->dev->bdev; |
4f024f37 | 1639 | bio->bi_iter.bi_sector = page_bad->physical >> 9; |
b5d67f64 SB |
1640 | |
1641 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); | |
1642 | if (PAGE_SIZE != ret) { | |
1643 | bio_put(bio); | |
1644 | return -EIO; | |
13db62b7 | 1645 | } |
b5d67f64 | 1646 | |
33879d45 | 1647 | if (btrfsic_submit_bio_wait(WRITE, bio)) { |
442a4f63 SB |
1648 | btrfs_dev_stat_inc_and_print(page_bad->dev, |
1649 | BTRFS_DEV_STAT_WRITE_ERRS); | |
ff023aac SB |
1650 | btrfs_dev_replace_stats_inc( |
1651 | &sblock_bad->sctx->dev_root->fs_info-> | |
1652 | dev_replace.num_write_errors); | |
442a4f63 SB |
1653 | bio_put(bio); |
1654 | return -EIO; | |
1655 | } | |
b5d67f64 | 1656 | bio_put(bio); |
a2de733c AJ |
1657 | } |
1658 | ||
b5d67f64 SB |
1659 | return 0; |
1660 | } | |
1661 | ||
ff023aac SB |
1662 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
1663 | { | |
1664 | int page_num; | |
1665 | ||
5a6ac9ea MX |
1666 | /* |
1667 | * This block is used for the check of the parity on the source device, | |
1668 | * so the data needn't be written into the destination device. | |
1669 | */ | |
1670 | if (sblock->sparity) | |
1671 | return; | |
1672 | ||
ff023aac SB |
1673 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1674 | int ret; | |
1675 | ||
1676 | ret = scrub_write_page_to_dev_replace(sblock, page_num); | |
1677 | if (ret) | |
1678 | btrfs_dev_replace_stats_inc( | |
1679 | &sblock->sctx->dev_root->fs_info->dev_replace. | |
1680 | num_write_errors); | |
1681 | } | |
1682 | } | |
1683 | ||
1684 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
1685 | int page_num) | |
1686 | { | |
1687 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1688 | ||
1689 | BUG_ON(spage->page == NULL); | |
1690 | if (spage->io_error) { | |
1691 | void *mapped_buffer = kmap_atomic(spage->page); | |
1692 | ||
1693 | memset(mapped_buffer, 0, PAGE_CACHE_SIZE); | |
1694 | flush_dcache_page(spage->page); | |
1695 | kunmap_atomic(mapped_buffer); | |
1696 | } | |
1697 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); | |
1698 | } | |
1699 | ||
1700 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
1701 | struct scrub_page *spage) | |
1702 | { | |
1703 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1704 | struct scrub_bio *sbio; | |
1705 | int ret; | |
1706 | ||
1707 | mutex_lock(&wr_ctx->wr_lock); | |
1708 | again: | |
1709 | if (!wr_ctx->wr_curr_bio) { | |
1710 | wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio), | |
1711 | GFP_NOFS); | |
1712 | if (!wr_ctx->wr_curr_bio) { | |
1713 | mutex_unlock(&wr_ctx->wr_lock); | |
1714 | return -ENOMEM; | |
1715 | } | |
1716 | wr_ctx->wr_curr_bio->sctx = sctx; | |
1717 | wr_ctx->wr_curr_bio->page_count = 0; | |
1718 | } | |
1719 | sbio = wr_ctx->wr_curr_bio; | |
1720 | if (sbio->page_count == 0) { | |
1721 | struct bio *bio; | |
1722 | ||
1723 | sbio->physical = spage->physical_for_dev_replace; | |
1724 | sbio->logical = spage->logical; | |
1725 | sbio->dev = wr_ctx->tgtdev; | |
1726 | bio = sbio->bio; | |
1727 | if (!bio) { | |
9be3395b | 1728 | bio = btrfs_io_bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio); |
ff023aac SB |
1729 | if (!bio) { |
1730 | mutex_unlock(&wr_ctx->wr_lock); | |
1731 | return -ENOMEM; | |
1732 | } | |
1733 | sbio->bio = bio; | |
1734 | } | |
1735 | ||
1736 | bio->bi_private = sbio; | |
1737 | bio->bi_end_io = scrub_wr_bio_end_io; | |
1738 | bio->bi_bdev = sbio->dev->bdev; | |
4f024f37 | 1739 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
ff023aac SB |
1740 | sbio->err = 0; |
1741 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != | |
1742 | spage->physical_for_dev_replace || | |
1743 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
1744 | spage->logical) { | |
1745 | scrub_wr_submit(sctx); | |
1746 | goto again; | |
1747 | } | |
1748 | ||
1749 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1750 | if (ret != PAGE_SIZE) { | |
1751 | if (sbio->page_count < 1) { | |
1752 | bio_put(sbio->bio); | |
1753 | sbio->bio = NULL; | |
1754 | mutex_unlock(&wr_ctx->wr_lock); | |
1755 | return -EIO; | |
1756 | } | |
1757 | scrub_wr_submit(sctx); | |
1758 | goto again; | |
1759 | } | |
1760 | ||
1761 | sbio->pagev[sbio->page_count] = spage; | |
1762 | scrub_page_get(spage); | |
1763 | sbio->page_count++; | |
1764 | if (sbio->page_count == wr_ctx->pages_per_wr_bio) | |
1765 | scrub_wr_submit(sctx); | |
1766 | mutex_unlock(&wr_ctx->wr_lock); | |
1767 | ||
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | static void scrub_wr_submit(struct scrub_ctx *sctx) | |
1772 | { | |
1773 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1774 | struct scrub_bio *sbio; | |
1775 | ||
1776 | if (!wr_ctx->wr_curr_bio) | |
1777 | return; | |
1778 | ||
1779 | sbio = wr_ctx->wr_curr_bio; | |
1780 | wr_ctx->wr_curr_bio = NULL; | |
1781 | WARN_ON(!sbio->bio->bi_bdev); | |
1782 | scrub_pending_bio_inc(sctx); | |
1783 | /* process all writes in a single worker thread. Then the block layer | |
1784 | * orders the requests before sending them to the driver which | |
1785 | * doubled the write performance on spinning disks when measured | |
1786 | * with Linux 3.5 */ | |
1787 | btrfsic_submit_bio(WRITE, sbio->bio); | |
1788 | } | |
1789 | ||
4246a0b6 | 1790 | static void scrub_wr_bio_end_io(struct bio *bio) |
ff023aac SB |
1791 | { |
1792 | struct scrub_bio *sbio = bio->bi_private; | |
1793 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; | |
1794 | ||
4246a0b6 | 1795 | sbio->err = bio->bi_error; |
ff023aac SB |
1796 | sbio->bio = bio; |
1797 | ||
9e0af237 LB |
1798 | btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper, |
1799 | scrub_wr_bio_end_io_worker, NULL, NULL); | |
0339ef2f | 1800 | btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work); |
ff023aac SB |
1801 | } |
1802 | ||
1803 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) | |
1804 | { | |
1805 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
1806 | struct scrub_ctx *sctx = sbio->sctx; | |
1807 | int i; | |
1808 | ||
1809 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); | |
1810 | if (sbio->err) { | |
1811 | struct btrfs_dev_replace *dev_replace = | |
1812 | &sbio->sctx->dev_root->fs_info->dev_replace; | |
1813 | ||
1814 | for (i = 0; i < sbio->page_count; i++) { | |
1815 | struct scrub_page *spage = sbio->pagev[i]; | |
1816 | ||
1817 | spage->io_error = 1; | |
1818 | btrfs_dev_replace_stats_inc(&dev_replace-> | |
1819 | num_write_errors); | |
1820 | } | |
1821 | } | |
1822 | ||
1823 | for (i = 0; i < sbio->page_count; i++) | |
1824 | scrub_page_put(sbio->pagev[i]); | |
1825 | ||
1826 | bio_put(sbio->bio); | |
1827 | kfree(sbio); | |
1828 | scrub_pending_bio_dec(sctx); | |
1829 | } | |
1830 | ||
1831 | static int scrub_checksum(struct scrub_block *sblock) | |
b5d67f64 SB |
1832 | { |
1833 | u64 flags; | |
1834 | int ret; | |
1835 | ||
7a9e9987 SB |
1836 | WARN_ON(sblock->page_count < 1); |
1837 | flags = sblock->pagev[0]->flags; | |
b5d67f64 SB |
1838 | ret = 0; |
1839 | if (flags & BTRFS_EXTENT_FLAG_DATA) | |
1840 | ret = scrub_checksum_data(sblock); | |
1841 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) | |
1842 | ret = scrub_checksum_tree_block(sblock); | |
1843 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
1844 | (void)scrub_checksum_super(sblock); | |
1845 | else | |
1846 | WARN_ON(1); | |
1847 | if (ret) | |
1848 | scrub_handle_errored_block(sblock); | |
ff023aac SB |
1849 | |
1850 | return ret; | |
a2de733c AJ |
1851 | } |
1852 | ||
b5d67f64 | 1853 | static int scrub_checksum_data(struct scrub_block *sblock) |
a2de733c | 1854 | { |
d9d181c1 | 1855 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1856 | u8 csum[BTRFS_CSUM_SIZE]; |
b5d67f64 SB |
1857 | u8 *on_disk_csum; |
1858 | struct page *page; | |
1859 | void *buffer; | |
a2de733c AJ |
1860 | u32 crc = ~(u32)0; |
1861 | int fail = 0; | |
b5d67f64 SB |
1862 | u64 len; |
1863 | int index; | |
a2de733c | 1864 | |
b5d67f64 | 1865 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1866 | if (!sblock->pagev[0]->have_csum) |
a2de733c AJ |
1867 | return 0; |
1868 | ||
7a9e9987 SB |
1869 | on_disk_csum = sblock->pagev[0]->csum; |
1870 | page = sblock->pagev[0]->page; | |
9613bebb | 1871 | buffer = kmap_atomic(page); |
b5d67f64 | 1872 | |
d9d181c1 | 1873 | len = sctx->sectorsize; |
b5d67f64 SB |
1874 | index = 0; |
1875 | for (;;) { | |
1876 | u64 l = min_t(u64, len, PAGE_SIZE); | |
1877 | ||
b0496686 | 1878 | crc = btrfs_csum_data(buffer, crc, l); |
9613bebb | 1879 | kunmap_atomic(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 | buffer = kmap_atomic(page); |
b5d67f64 SB |
1888 | } |
1889 | ||
a2de733c | 1890 | btrfs_csum_final(crc, csum); |
d9d181c1 | 1891 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1892 | fail = 1; |
1893 | ||
a2de733c AJ |
1894 | return fail; |
1895 | } | |
1896 | ||
b5d67f64 | 1897 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
a2de733c | 1898 | { |
d9d181c1 | 1899 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1900 | struct btrfs_header *h; |
a36cf8b8 | 1901 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 1902 | struct btrfs_fs_info *fs_info = root->fs_info; |
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 AJ |
1909 | u32 crc = ~(u32)0; |
1910 | int fail = 0; | |
1911 | int crc_fail = 0; | |
b5d67f64 SB |
1912 | u64 len; |
1913 | int index; | |
1914 | ||
1915 | BUG_ON(sblock->page_count < 1); | |
7a9e9987 | 1916 | page = sblock->pagev[0]->page; |
9613bebb | 1917 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1918 | h = (struct btrfs_header *)mapped_buffer; |
d9d181c1 | 1919 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
a2de733c AJ |
1920 | |
1921 | /* | |
1922 | * we don't use the getter functions here, as we | |
1923 | * a) don't have an extent buffer and | |
1924 | * b) the page is already kmapped | |
1925 | */ | |
a2de733c | 1926 | |
3cae210f | 1927 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h)) |
a2de733c AJ |
1928 | ++fail; |
1929 | ||
3cae210f | 1930 | if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h)) |
a2de733c AJ |
1931 | ++fail; |
1932 | ||
17a9be2f | 1933 | if (!scrub_check_fsid(h->fsid, sblock->pagev[0])) |
a2de733c AJ |
1934 | ++fail; |
1935 | ||
1936 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
1937 | BTRFS_UUID_SIZE)) | |
1938 | ++fail; | |
1939 | ||
d9d181c1 | 1940 | len = sctx->nodesize - BTRFS_CSUM_SIZE; |
b5d67f64 SB |
1941 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
1942 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1943 | index = 0; | |
1944 | for (;;) { | |
1945 | u64 l = min_t(u64, len, mapped_size); | |
1946 | ||
b0496686 | 1947 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 1948 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1949 | len -= l; |
1950 | if (len == 0) | |
1951 | break; | |
1952 | index++; | |
1953 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1954 | BUG_ON(!sblock->pagev[index]->page); |
1955 | page = sblock->pagev[index]->page; | |
9613bebb | 1956 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1957 | mapped_size = PAGE_SIZE; |
1958 | p = mapped_buffer; | |
1959 | } | |
1960 | ||
1961 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1962 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1963 | ++crc_fail; |
1964 | ||
a2de733c AJ |
1965 | return fail || crc_fail; |
1966 | } | |
1967 | ||
b5d67f64 | 1968 | static int scrub_checksum_super(struct scrub_block *sblock) |
a2de733c AJ |
1969 | { |
1970 | struct btrfs_super_block *s; | |
d9d181c1 | 1971 | struct scrub_ctx *sctx = sblock->sctx; |
b5d67f64 SB |
1972 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1973 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1974 | struct page *page; | |
1975 | void *mapped_buffer; | |
1976 | u64 mapped_size; | |
1977 | void *p; | |
a2de733c | 1978 | u32 crc = ~(u32)0; |
442a4f63 SB |
1979 | int fail_gen = 0; |
1980 | int fail_cor = 0; | |
b5d67f64 SB |
1981 | u64 len; |
1982 | int index; | |
a2de733c | 1983 | |
b5d67f64 | 1984 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1985 | page = sblock->pagev[0]->page; |
9613bebb | 1986 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1987 | s = (struct btrfs_super_block *)mapped_buffer; |
d9d181c1 | 1988 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
a2de733c | 1989 | |
3cae210f | 1990 | if (sblock->pagev[0]->logical != btrfs_super_bytenr(s)) |
442a4f63 | 1991 | ++fail_cor; |
a2de733c | 1992 | |
3cae210f | 1993 | if (sblock->pagev[0]->generation != btrfs_super_generation(s)) |
442a4f63 | 1994 | ++fail_gen; |
a2de733c | 1995 | |
17a9be2f | 1996 | if (!scrub_check_fsid(s->fsid, sblock->pagev[0])) |
442a4f63 | 1997 | ++fail_cor; |
a2de733c | 1998 | |
b5d67f64 SB |
1999 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
2000 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; | |
2001 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
2002 | index = 0; | |
2003 | for (;;) { | |
2004 | u64 l = min_t(u64, len, mapped_size); | |
2005 | ||
b0496686 | 2006 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 2007 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
2008 | len -= l; |
2009 | if (len == 0) | |
2010 | break; | |
2011 | index++; | |
2012 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
2013 | BUG_ON(!sblock->pagev[index]->page); |
2014 | page = sblock->pagev[index]->page; | |
9613bebb | 2015 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
2016 | mapped_size = PAGE_SIZE; |
2017 | p = mapped_buffer; | |
2018 | } | |
2019 | ||
2020 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 2021 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
442a4f63 | 2022 | ++fail_cor; |
a2de733c | 2023 | |
442a4f63 | 2024 | if (fail_cor + fail_gen) { |
a2de733c AJ |
2025 | /* |
2026 | * if we find an error in a super block, we just report it. | |
2027 | * They will get written with the next transaction commit | |
2028 | * anyway | |
2029 | */ | |
d9d181c1 SB |
2030 | spin_lock(&sctx->stat_lock); |
2031 | ++sctx->stat.super_errors; | |
2032 | spin_unlock(&sctx->stat_lock); | |
442a4f63 | 2033 | if (fail_cor) |
7a9e9987 | 2034 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 SB |
2035 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
2036 | else | |
7a9e9987 | 2037 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 | 2038 | BTRFS_DEV_STAT_GENERATION_ERRS); |
a2de733c AJ |
2039 | } |
2040 | ||
442a4f63 | 2041 | return fail_cor + fail_gen; |
a2de733c AJ |
2042 | } |
2043 | ||
b5d67f64 SB |
2044 | static void scrub_block_get(struct scrub_block *sblock) |
2045 | { | |
57019345 | 2046 | atomic_inc(&sblock->refs); |
b5d67f64 SB |
2047 | } |
2048 | ||
2049 | static void scrub_block_put(struct scrub_block *sblock) | |
2050 | { | |
57019345 | 2051 | if (atomic_dec_and_test(&sblock->refs)) { |
b5d67f64 SB |
2052 | int i; |
2053 | ||
5a6ac9ea MX |
2054 | if (sblock->sparity) |
2055 | scrub_parity_put(sblock->sparity); | |
2056 | ||
b5d67f64 | 2057 | for (i = 0; i < sblock->page_count; i++) |
7a9e9987 | 2058 | scrub_page_put(sblock->pagev[i]); |
b5d67f64 SB |
2059 | kfree(sblock); |
2060 | } | |
2061 | } | |
2062 | ||
7a9e9987 SB |
2063 | static void scrub_page_get(struct scrub_page *spage) |
2064 | { | |
57019345 | 2065 | atomic_inc(&spage->refs); |
7a9e9987 SB |
2066 | } |
2067 | ||
2068 | static void scrub_page_put(struct scrub_page *spage) | |
2069 | { | |
57019345 | 2070 | if (atomic_dec_and_test(&spage->refs)) { |
7a9e9987 SB |
2071 | if (spage->page) |
2072 | __free_page(spage->page); | |
2073 | kfree(spage); | |
2074 | } | |
2075 | } | |
2076 | ||
d9d181c1 | 2077 | static void scrub_submit(struct scrub_ctx *sctx) |
a2de733c AJ |
2078 | { |
2079 | struct scrub_bio *sbio; | |
2080 | ||
d9d181c1 | 2081 | if (sctx->curr == -1) |
1623edeb | 2082 | return; |
a2de733c | 2083 | |
d9d181c1 SB |
2084 | sbio = sctx->bios[sctx->curr]; |
2085 | sctx->curr = -1; | |
b6bfebc1 | 2086 | scrub_pending_bio_inc(sctx); |
03679ade | 2087 | btrfsic_submit_bio(READ, sbio->bio); |
a2de733c AJ |
2088 | } |
2089 | ||
ff023aac SB |
2090 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
2091 | struct scrub_page *spage) | |
a2de733c | 2092 | { |
b5d67f64 | 2093 | struct scrub_block *sblock = spage->sblock; |
a2de733c | 2094 | struct scrub_bio *sbio; |
69f4cb52 | 2095 | int ret; |
a2de733c AJ |
2096 | |
2097 | again: | |
2098 | /* | |
2099 | * grab a fresh bio or wait for one to become available | |
2100 | */ | |
d9d181c1 SB |
2101 | while (sctx->curr == -1) { |
2102 | spin_lock(&sctx->list_lock); | |
2103 | sctx->curr = sctx->first_free; | |
2104 | if (sctx->curr != -1) { | |
2105 | sctx->first_free = sctx->bios[sctx->curr]->next_free; | |
2106 | sctx->bios[sctx->curr]->next_free = -1; | |
2107 | sctx->bios[sctx->curr]->page_count = 0; | |
2108 | spin_unlock(&sctx->list_lock); | |
a2de733c | 2109 | } else { |
d9d181c1 SB |
2110 | spin_unlock(&sctx->list_lock); |
2111 | wait_event(sctx->list_wait, sctx->first_free != -1); | |
a2de733c AJ |
2112 | } |
2113 | } | |
d9d181c1 | 2114 | sbio = sctx->bios[sctx->curr]; |
b5d67f64 | 2115 | if (sbio->page_count == 0) { |
69f4cb52 AJ |
2116 | struct bio *bio; |
2117 | ||
b5d67f64 SB |
2118 | sbio->physical = spage->physical; |
2119 | sbio->logical = spage->logical; | |
a36cf8b8 | 2120 | sbio->dev = spage->dev; |
b5d67f64 SB |
2121 | bio = sbio->bio; |
2122 | if (!bio) { | |
9be3395b | 2123 | bio = btrfs_io_bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio); |
b5d67f64 SB |
2124 | if (!bio) |
2125 | return -ENOMEM; | |
2126 | sbio->bio = bio; | |
2127 | } | |
69f4cb52 AJ |
2128 | |
2129 | bio->bi_private = sbio; | |
2130 | bio->bi_end_io = scrub_bio_end_io; | |
a36cf8b8 | 2131 | bio->bi_bdev = sbio->dev->bdev; |
4f024f37 | 2132 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
69f4cb52 | 2133 | sbio->err = 0; |
b5d67f64 SB |
2134 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
2135 | spage->physical || | |
2136 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
a36cf8b8 SB |
2137 | spage->logical || |
2138 | sbio->dev != spage->dev) { | |
d9d181c1 | 2139 | scrub_submit(sctx); |
a2de733c AJ |
2140 | goto again; |
2141 | } | |
69f4cb52 | 2142 | |
b5d67f64 SB |
2143 | sbio->pagev[sbio->page_count] = spage; |
2144 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
2145 | if (ret != PAGE_SIZE) { | |
2146 | if (sbio->page_count < 1) { | |
2147 | bio_put(sbio->bio); | |
2148 | sbio->bio = NULL; | |
2149 | return -EIO; | |
2150 | } | |
d9d181c1 | 2151 | scrub_submit(sctx); |
69f4cb52 AJ |
2152 | goto again; |
2153 | } | |
2154 | ||
ff023aac | 2155 | scrub_block_get(sblock); /* one for the page added to the bio */ |
b5d67f64 SB |
2156 | atomic_inc(&sblock->outstanding_pages); |
2157 | sbio->page_count++; | |
ff023aac | 2158 | if (sbio->page_count == sctx->pages_per_rd_bio) |
d9d181c1 | 2159 | scrub_submit(sctx); |
b5d67f64 SB |
2160 | |
2161 | return 0; | |
2162 | } | |
2163 | ||
22365979 | 2164 | static void scrub_missing_raid56_end_io(struct bio *bio) |
73ff61db OS |
2165 | { |
2166 | struct scrub_block *sblock = bio->bi_private; | |
2167 | struct btrfs_fs_info *fs_info = sblock->sctx->dev_root->fs_info; | |
2168 | ||
22365979 | 2169 | if (bio->bi_error) |
73ff61db OS |
2170 | sblock->no_io_error_seen = 0; |
2171 | ||
2172 | btrfs_queue_work(fs_info->scrub_workers, &sblock->work); | |
2173 | } | |
2174 | ||
2175 | static void scrub_missing_raid56_worker(struct btrfs_work *work) | |
2176 | { | |
2177 | struct scrub_block *sblock = container_of(work, struct scrub_block, work); | |
2178 | struct scrub_ctx *sctx = sblock->sctx; | |
2179 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
2180 | unsigned int is_metadata; | |
2181 | unsigned int have_csum; | |
2182 | u8 *csum; | |
2183 | u64 generation; | |
2184 | u64 logical; | |
2185 | struct btrfs_device *dev; | |
2186 | ||
2187 | is_metadata = !(sblock->pagev[0]->flags & BTRFS_EXTENT_FLAG_DATA); | |
2188 | have_csum = sblock->pagev[0]->have_csum; | |
2189 | csum = sblock->pagev[0]->csum; | |
2190 | generation = sblock->pagev[0]->generation; | |
2191 | logical = sblock->pagev[0]->logical; | |
2192 | dev = sblock->pagev[0]->dev; | |
2193 | ||
2194 | if (sblock->no_io_error_seen) { | |
2195 | scrub_recheck_block_checksum(fs_info, sblock, is_metadata, | |
2196 | have_csum, csum, generation, | |
2197 | sctx->csum_size); | |
2198 | } | |
2199 | ||
2200 | if (!sblock->no_io_error_seen) { | |
2201 | spin_lock(&sctx->stat_lock); | |
2202 | sctx->stat.read_errors++; | |
2203 | spin_unlock(&sctx->stat_lock); | |
2204 | printk_ratelimited_in_rcu(KERN_ERR | |
2205 | "BTRFS: I/O error rebulding logical %llu for dev %s\n", | |
2206 | logical, rcu_str_deref(dev->name)); | |
2207 | } else if (sblock->header_error || sblock->checksum_error) { | |
2208 | spin_lock(&sctx->stat_lock); | |
2209 | sctx->stat.uncorrectable_errors++; | |
2210 | spin_unlock(&sctx->stat_lock); | |
2211 | printk_ratelimited_in_rcu(KERN_ERR | |
2212 | "BTRFS: failed to rebuild valid logical %llu for dev %s\n", | |
2213 | logical, rcu_str_deref(dev->name)); | |
2214 | } else { | |
2215 | scrub_write_block_to_dev_replace(sblock); | |
2216 | } | |
2217 | ||
2218 | scrub_block_put(sblock); | |
2219 | ||
2220 | if (sctx->is_dev_replace && | |
2221 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { | |
2222 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2223 | scrub_wr_submit(sctx); | |
2224 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2225 | } | |
2226 | ||
2227 | scrub_pending_bio_dec(sctx); | |
2228 | } | |
2229 | ||
2230 | static void scrub_missing_raid56_pages(struct scrub_block *sblock) | |
2231 | { | |
2232 | struct scrub_ctx *sctx = sblock->sctx; | |
2233 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
2234 | u64 length = sblock->page_count * PAGE_SIZE; | |
2235 | u64 logical = sblock->pagev[0]->logical; | |
2236 | struct btrfs_bio *bbio; | |
2237 | struct bio *bio; | |
2238 | struct btrfs_raid_bio *rbio; | |
2239 | int ret; | |
2240 | int i; | |
2241 | ||
2242 | ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical, &length, | |
2243 | &bbio, 0, 1); | |
2244 | if (ret || !bbio || !bbio->raid_map) | |
2245 | goto bbio_out; | |
2246 | ||
2247 | if (WARN_ON(!sctx->is_dev_replace || | |
2248 | !(bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK))) { | |
2249 | /* | |
2250 | * We shouldn't be scrubbing a missing device. Even for dev | |
2251 | * replace, we should only get here for RAID 5/6. We either | |
2252 | * managed to mount something with no mirrors remaining or | |
2253 | * there's a bug in scrub_remap_extent()/btrfs_map_block(). | |
2254 | */ | |
2255 | goto bbio_out; | |
2256 | } | |
2257 | ||
2258 | bio = btrfs_io_bio_alloc(GFP_NOFS, 0); | |
2259 | if (!bio) | |
2260 | goto bbio_out; | |
2261 | ||
2262 | bio->bi_iter.bi_sector = logical >> 9; | |
2263 | bio->bi_private = sblock; | |
2264 | bio->bi_end_io = scrub_missing_raid56_end_io; | |
2265 | ||
2266 | rbio = raid56_alloc_missing_rbio(sctx->dev_root, bio, bbio, length); | |
2267 | if (!rbio) | |
2268 | goto rbio_out; | |
2269 | ||
2270 | for (i = 0; i < sblock->page_count; i++) { | |
2271 | struct scrub_page *spage = sblock->pagev[i]; | |
2272 | ||
2273 | raid56_add_scrub_pages(rbio, spage->page, spage->logical); | |
2274 | } | |
2275 | ||
2276 | btrfs_init_work(&sblock->work, btrfs_scrub_helper, | |
2277 | scrub_missing_raid56_worker, NULL, NULL); | |
2278 | scrub_block_get(sblock); | |
2279 | scrub_pending_bio_inc(sctx); | |
2280 | raid56_submit_missing_rbio(rbio); | |
2281 | return; | |
2282 | ||
2283 | rbio_out: | |
2284 | bio_put(bio); | |
2285 | bbio_out: | |
2286 | btrfs_put_bbio(bbio); | |
2287 | spin_lock(&sctx->stat_lock); | |
2288 | sctx->stat.malloc_errors++; | |
2289 | spin_unlock(&sctx->stat_lock); | |
2290 | } | |
2291 | ||
d9d181c1 | 2292 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2293 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
2294 | u64 gen, int mirror_num, u8 *csum, int force, |
2295 | u64 physical_for_dev_replace) | |
b5d67f64 SB |
2296 | { |
2297 | struct scrub_block *sblock; | |
2298 | int index; | |
2299 | ||
2300 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
2301 | if (!sblock) { | |
d9d181c1 SB |
2302 | spin_lock(&sctx->stat_lock); |
2303 | sctx->stat.malloc_errors++; | |
2304 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2305 | return -ENOMEM; |
a2de733c | 2306 | } |
b5d67f64 | 2307 | |
7a9e9987 SB |
2308 | /* one ref inside this function, plus one for each page added to |
2309 | * a bio later on */ | |
57019345 | 2310 | atomic_set(&sblock->refs, 1); |
d9d181c1 | 2311 | sblock->sctx = sctx; |
b5d67f64 SB |
2312 | sblock->no_io_error_seen = 1; |
2313 | ||
2314 | for (index = 0; len > 0; index++) { | |
7a9e9987 | 2315 | struct scrub_page *spage; |
b5d67f64 SB |
2316 | u64 l = min_t(u64, len, PAGE_SIZE); |
2317 | ||
7a9e9987 SB |
2318 | spage = kzalloc(sizeof(*spage), GFP_NOFS); |
2319 | if (!spage) { | |
2320 | leave_nomem: | |
d9d181c1 SB |
2321 | spin_lock(&sctx->stat_lock); |
2322 | sctx->stat.malloc_errors++; | |
2323 | spin_unlock(&sctx->stat_lock); | |
7a9e9987 | 2324 | scrub_block_put(sblock); |
b5d67f64 SB |
2325 | return -ENOMEM; |
2326 | } | |
7a9e9987 SB |
2327 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
2328 | scrub_page_get(spage); | |
2329 | sblock->pagev[index] = spage; | |
b5d67f64 | 2330 | spage->sblock = sblock; |
a36cf8b8 | 2331 | spage->dev = dev; |
b5d67f64 SB |
2332 | spage->flags = flags; |
2333 | spage->generation = gen; | |
2334 | spage->logical = logical; | |
2335 | spage->physical = physical; | |
ff023aac | 2336 | spage->physical_for_dev_replace = physical_for_dev_replace; |
b5d67f64 SB |
2337 | spage->mirror_num = mirror_num; |
2338 | if (csum) { | |
2339 | spage->have_csum = 1; | |
d9d181c1 | 2340 | memcpy(spage->csum, csum, sctx->csum_size); |
b5d67f64 SB |
2341 | } else { |
2342 | spage->have_csum = 0; | |
2343 | } | |
2344 | sblock->page_count++; | |
7a9e9987 SB |
2345 | spage->page = alloc_page(GFP_NOFS); |
2346 | if (!spage->page) | |
2347 | goto leave_nomem; | |
b5d67f64 SB |
2348 | len -= l; |
2349 | logical += l; | |
2350 | physical += l; | |
ff023aac | 2351 | physical_for_dev_replace += l; |
b5d67f64 SB |
2352 | } |
2353 | ||
7a9e9987 | 2354 | WARN_ON(sblock->page_count == 0); |
73ff61db OS |
2355 | if (dev->missing) { |
2356 | /* | |
2357 | * This case should only be hit for RAID 5/6 device replace. See | |
2358 | * the comment in scrub_missing_raid56_pages() for details. | |
2359 | */ | |
2360 | scrub_missing_raid56_pages(sblock); | |
2361 | } else { | |
2362 | for (index = 0; index < sblock->page_count; index++) { | |
2363 | struct scrub_page *spage = sblock->pagev[index]; | |
2364 | int ret; | |
1bc87793 | 2365 | |
73ff61db OS |
2366 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
2367 | if (ret) { | |
2368 | scrub_block_put(sblock); | |
2369 | return ret; | |
2370 | } | |
b5d67f64 | 2371 | } |
a2de733c | 2372 | |
73ff61db OS |
2373 | if (force) |
2374 | scrub_submit(sctx); | |
2375 | } | |
a2de733c | 2376 | |
b5d67f64 SB |
2377 | /* last one frees, either here or in bio completion for last page */ |
2378 | scrub_block_put(sblock); | |
a2de733c AJ |
2379 | return 0; |
2380 | } | |
2381 | ||
4246a0b6 | 2382 | static void scrub_bio_end_io(struct bio *bio) |
b5d67f64 SB |
2383 | { |
2384 | struct scrub_bio *sbio = bio->bi_private; | |
a36cf8b8 | 2385 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
b5d67f64 | 2386 | |
4246a0b6 | 2387 | sbio->err = bio->bi_error; |
b5d67f64 SB |
2388 | sbio->bio = bio; |
2389 | ||
0339ef2f | 2390 | btrfs_queue_work(fs_info->scrub_workers, &sbio->work); |
b5d67f64 SB |
2391 | } |
2392 | ||
2393 | static void scrub_bio_end_io_worker(struct btrfs_work *work) | |
2394 | { | |
2395 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
d9d181c1 | 2396 | struct scrub_ctx *sctx = sbio->sctx; |
b5d67f64 SB |
2397 | int i; |
2398 | ||
ff023aac | 2399 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
2400 | if (sbio->err) { |
2401 | for (i = 0; i < sbio->page_count; i++) { | |
2402 | struct scrub_page *spage = sbio->pagev[i]; | |
2403 | ||
2404 | spage->io_error = 1; | |
2405 | spage->sblock->no_io_error_seen = 0; | |
2406 | } | |
2407 | } | |
2408 | ||
2409 | /* now complete the scrub_block items that have all pages completed */ | |
2410 | for (i = 0; i < sbio->page_count; i++) { | |
2411 | struct scrub_page *spage = sbio->pagev[i]; | |
2412 | struct scrub_block *sblock = spage->sblock; | |
2413 | ||
2414 | if (atomic_dec_and_test(&sblock->outstanding_pages)) | |
2415 | scrub_block_complete(sblock); | |
2416 | scrub_block_put(sblock); | |
2417 | } | |
2418 | ||
b5d67f64 SB |
2419 | bio_put(sbio->bio); |
2420 | sbio->bio = NULL; | |
d9d181c1 SB |
2421 | spin_lock(&sctx->list_lock); |
2422 | sbio->next_free = sctx->first_free; | |
2423 | sctx->first_free = sbio->index; | |
2424 | spin_unlock(&sctx->list_lock); | |
ff023aac SB |
2425 | |
2426 | if (sctx->is_dev_replace && | |
2427 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { | |
2428 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2429 | scrub_wr_submit(sctx); | |
2430 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2431 | } | |
2432 | ||
b6bfebc1 | 2433 | scrub_pending_bio_dec(sctx); |
b5d67f64 SB |
2434 | } |
2435 | ||
5a6ac9ea MX |
2436 | static inline void __scrub_mark_bitmap(struct scrub_parity *sparity, |
2437 | unsigned long *bitmap, | |
2438 | u64 start, u64 len) | |
2439 | { | |
9d644a62 | 2440 | u32 offset; |
5a6ac9ea MX |
2441 | int nsectors; |
2442 | int sectorsize = sparity->sctx->dev_root->sectorsize; | |
2443 | ||
2444 | if (len >= sparity->stripe_len) { | |
2445 | bitmap_set(bitmap, 0, sparity->nsectors); | |
2446 | return; | |
2447 | } | |
2448 | ||
2449 | start -= sparity->logic_start; | |
47c5713f | 2450 | start = div_u64_rem(start, sparity->stripe_len, &offset); |
5a6ac9ea MX |
2451 | offset /= sectorsize; |
2452 | nsectors = (int)len / sectorsize; | |
2453 | ||
2454 | if (offset + nsectors <= sparity->nsectors) { | |
2455 | bitmap_set(bitmap, offset, nsectors); | |
2456 | return; | |
2457 | } | |
2458 | ||
2459 | bitmap_set(bitmap, offset, sparity->nsectors - offset); | |
2460 | bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset)); | |
2461 | } | |
2462 | ||
2463 | static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity, | |
2464 | u64 start, u64 len) | |
2465 | { | |
2466 | __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len); | |
2467 | } | |
2468 | ||
2469 | static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity, | |
2470 | u64 start, u64 len) | |
2471 | { | |
2472 | __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len); | |
2473 | } | |
2474 | ||
b5d67f64 SB |
2475 | static void scrub_block_complete(struct scrub_block *sblock) |
2476 | { | |
5a6ac9ea MX |
2477 | int corrupted = 0; |
2478 | ||
ff023aac | 2479 | if (!sblock->no_io_error_seen) { |
5a6ac9ea | 2480 | corrupted = 1; |
b5d67f64 | 2481 | scrub_handle_errored_block(sblock); |
ff023aac SB |
2482 | } else { |
2483 | /* | |
2484 | * if has checksum error, write via repair mechanism in | |
2485 | * dev replace case, otherwise write here in dev replace | |
2486 | * case. | |
2487 | */ | |
5a6ac9ea MX |
2488 | corrupted = scrub_checksum(sblock); |
2489 | if (!corrupted && sblock->sctx->is_dev_replace) | |
ff023aac SB |
2490 | scrub_write_block_to_dev_replace(sblock); |
2491 | } | |
5a6ac9ea MX |
2492 | |
2493 | if (sblock->sparity && corrupted && !sblock->data_corrected) { | |
2494 | u64 start = sblock->pagev[0]->logical; | |
2495 | u64 end = sblock->pagev[sblock->page_count - 1]->logical + | |
2496 | PAGE_SIZE; | |
2497 | ||
2498 | scrub_parity_mark_sectors_error(sblock->sparity, | |
2499 | start, end - start); | |
2500 | } | |
b5d67f64 SB |
2501 | } |
2502 | ||
d9d181c1 | 2503 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len, |
a2de733c AJ |
2504 | u8 *csum) |
2505 | { | |
2506 | struct btrfs_ordered_sum *sum = NULL; | |
f51a4a18 | 2507 | unsigned long index; |
a2de733c | 2508 | unsigned long num_sectors; |
a2de733c | 2509 | |
d9d181c1 SB |
2510 | while (!list_empty(&sctx->csum_list)) { |
2511 | sum = list_first_entry(&sctx->csum_list, | |
a2de733c AJ |
2512 | struct btrfs_ordered_sum, list); |
2513 | if (sum->bytenr > logical) | |
2514 | return 0; | |
2515 | if (sum->bytenr + sum->len > logical) | |
2516 | break; | |
2517 | ||
d9d181c1 | 2518 | ++sctx->stat.csum_discards; |
a2de733c AJ |
2519 | list_del(&sum->list); |
2520 | kfree(sum); | |
2521 | sum = NULL; | |
2522 | } | |
2523 | if (!sum) | |
2524 | return 0; | |
2525 | ||
f51a4a18 | 2526 | index = ((u32)(logical - sum->bytenr)) / sctx->sectorsize; |
d9d181c1 | 2527 | num_sectors = sum->len / sctx->sectorsize; |
f51a4a18 MX |
2528 | memcpy(csum, sum->sums + index, sctx->csum_size); |
2529 | if (index == num_sectors - 1) { | |
a2de733c AJ |
2530 | list_del(&sum->list); |
2531 | kfree(sum); | |
2532 | } | |
f51a4a18 | 2533 | return 1; |
a2de733c AJ |
2534 | } |
2535 | ||
2536 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
d9d181c1 | 2537 | static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2538 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac | 2539 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
a2de733c AJ |
2540 | { |
2541 | int ret; | |
2542 | u8 csum[BTRFS_CSUM_SIZE]; | |
b5d67f64 SB |
2543 | u32 blocksize; |
2544 | ||
2545 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
d9d181c1 SB |
2546 | blocksize = sctx->sectorsize; |
2547 | spin_lock(&sctx->stat_lock); | |
2548 | sctx->stat.data_extents_scrubbed++; | |
2549 | sctx->stat.data_bytes_scrubbed += len; | |
2550 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2551 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
d9d181c1 SB |
2552 | blocksize = sctx->nodesize; |
2553 | spin_lock(&sctx->stat_lock); | |
2554 | sctx->stat.tree_extents_scrubbed++; | |
2555 | sctx->stat.tree_bytes_scrubbed += len; | |
2556 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2557 | } else { |
d9d181c1 | 2558 | blocksize = sctx->sectorsize; |
ff023aac | 2559 | WARN_ON(1); |
b5d67f64 | 2560 | } |
a2de733c AJ |
2561 | |
2562 | while (len) { | |
b5d67f64 | 2563 | u64 l = min_t(u64, len, blocksize); |
a2de733c AJ |
2564 | int have_csum = 0; |
2565 | ||
2566 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2567 | /* push csums to sbio */ | |
d9d181c1 | 2568 | have_csum = scrub_find_csum(sctx, logical, l, csum); |
a2de733c | 2569 | if (have_csum == 0) |
d9d181c1 | 2570 | ++sctx->stat.no_csum; |
ff023aac SB |
2571 | if (sctx->is_dev_replace && !have_csum) { |
2572 | ret = copy_nocow_pages(sctx, logical, l, | |
2573 | mirror_num, | |
2574 | physical_for_dev_replace); | |
2575 | goto behind_scrub_pages; | |
2576 | } | |
a2de733c | 2577 | } |
a36cf8b8 | 2578 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
ff023aac SB |
2579 | mirror_num, have_csum ? csum : NULL, 0, |
2580 | physical_for_dev_replace); | |
2581 | behind_scrub_pages: | |
a2de733c AJ |
2582 | if (ret) |
2583 | return ret; | |
2584 | len -= l; | |
2585 | logical += l; | |
2586 | physical += l; | |
ff023aac | 2587 | physical_for_dev_replace += l; |
a2de733c AJ |
2588 | } |
2589 | return 0; | |
2590 | } | |
2591 | ||
5a6ac9ea MX |
2592 | static int scrub_pages_for_parity(struct scrub_parity *sparity, |
2593 | u64 logical, u64 len, | |
2594 | u64 physical, struct btrfs_device *dev, | |
2595 | u64 flags, u64 gen, int mirror_num, u8 *csum) | |
2596 | { | |
2597 | struct scrub_ctx *sctx = sparity->sctx; | |
2598 | struct scrub_block *sblock; | |
2599 | int index; | |
2600 | ||
2601 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
2602 | if (!sblock) { | |
2603 | spin_lock(&sctx->stat_lock); | |
2604 | sctx->stat.malloc_errors++; | |
2605 | spin_unlock(&sctx->stat_lock); | |
2606 | return -ENOMEM; | |
2607 | } | |
2608 | ||
2609 | /* one ref inside this function, plus one for each page added to | |
2610 | * a bio later on */ | |
57019345 | 2611 | atomic_set(&sblock->refs, 1); |
5a6ac9ea MX |
2612 | sblock->sctx = sctx; |
2613 | sblock->no_io_error_seen = 1; | |
2614 | sblock->sparity = sparity; | |
2615 | scrub_parity_get(sparity); | |
2616 | ||
2617 | for (index = 0; len > 0; index++) { | |
2618 | struct scrub_page *spage; | |
2619 | u64 l = min_t(u64, len, PAGE_SIZE); | |
2620 | ||
2621 | spage = kzalloc(sizeof(*spage), GFP_NOFS); | |
2622 | if (!spage) { | |
2623 | leave_nomem: | |
2624 | spin_lock(&sctx->stat_lock); | |
2625 | sctx->stat.malloc_errors++; | |
2626 | spin_unlock(&sctx->stat_lock); | |
2627 | scrub_block_put(sblock); | |
2628 | return -ENOMEM; | |
2629 | } | |
2630 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); | |
2631 | /* For scrub block */ | |
2632 | scrub_page_get(spage); | |
2633 | sblock->pagev[index] = spage; | |
2634 | /* For scrub parity */ | |
2635 | scrub_page_get(spage); | |
2636 | list_add_tail(&spage->list, &sparity->spages); | |
2637 | spage->sblock = sblock; | |
2638 | spage->dev = dev; | |
2639 | spage->flags = flags; | |
2640 | spage->generation = gen; | |
2641 | spage->logical = logical; | |
2642 | spage->physical = physical; | |
2643 | spage->mirror_num = mirror_num; | |
2644 | if (csum) { | |
2645 | spage->have_csum = 1; | |
2646 | memcpy(spage->csum, csum, sctx->csum_size); | |
2647 | } else { | |
2648 | spage->have_csum = 0; | |
2649 | } | |
2650 | sblock->page_count++; | |
2651 | spage->page = alloc_page(GFP_NOFS); | |
2652 | if (!spage->page) | |
2653 | goto leave_nomem; | |
2654 | len -= l; | |
2655 | logical += l; | |
2656 | physical += l; | |
2657 | } | |
2658 | ||
2659 | WARN_ON(sblock->page_count == 0); | |
2660 | for (index = 0; index < sblock->page_count; index++) { | |
2661 | struct scrub_page *spage = sblock->pagev[index]; | |
2662 | int ret; | |
2663 | ||
2664 | ret = scrub_add_page_to_rd_bio(sctx, spage); | |
2665 | if (ret) { | |
2666 | scrub_block_put(sblock); | |
2667 | return ret; | |
2668 | } | |
2669 | } | |
2670 | ||
2671 | /* last one frees, either here or in bio completion for last page */ | |
2672 | scrub_block_put(sblock); | |
2673 | return 0; | |
2674 | } | |
2675 | ||
2676 | static int scrub_extent_for_parity(struct scrub_parity *sparity, | |
2677 | u64 logical, u64 len, | |
2678 | u64 physical, struct btrfs_device *dev, | |
2679 | u64 flags, u64 gen, int mirror_num) | |
2680 | { | |
2681 | struct scrub_ctx *sctx = sparity->sctx; | |
2682 | int ret; | |
2683 | u8 csum[BTRFS_CSUM_SIZE]; | |
2684 | u32 blocksize; | |
2685 | ||
4a770891 OS |
2686 | if (dev->missing) { |
2687 | scrub_parity_mark_sectors_error(sparity, logical, len); | |
2688 | return 0; | |
2689 | } | |
2690 | ||
5a6ac9ea MX |
2691 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
2692 | blocksize = sctx->sectorsize; | |
2693 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
2694 | blocksize = sctx->nodesize; | |
2695 | } else { | |
2696 | blocksize = sctx->sectorsize; | |
2697 | WARN_ON(1); | |
2698 | } | |
2699 | ||
2700 | while (len) { | |
2701 | u64 l = min_t(u64, len, blocksize); | |
2702 | int have_csum = 0; | |
2703 | ||
2704 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2705 | /* push csums to sbio */ | |
2706 | have_csum = scrub_find_csum(sctx, logical, l, csum); | |
2707 | if (have_csum == 0) | |
2708 | goto skip; | |
2709 | } | |
2710 | ret = scrub_pages_for_parity(sparity, logical, l, physical, dev, | |
2711 | flags, gen, mirror_num, | |
2712 | have_csum ? csum : NULL); | |
5a6ac9ea MX |
2713 | if (ret) |
2714 | return ret; | |
6b6d24b3 | 2715 | skip: |
5a6ac9ea MX |
2716 | len -= l; |
2717 | logical += l; | |
2718 | physical += l; | |
2719 | } | |
2720 | return 0; | |
2721 | } | |
2722 | ||
3b080b25 WS |
2723 | /* |
2724 | * Given a physical address, this will calculate it's | |
2725 | * logical offset. if this is a parity stripe, it will return | |
2726 | * the most left data stripe's logical offset. | |
2727 | * | |
2728 | * return 0 if it is a data stripe, 1 means parity stripe. | |
2729 | */ | |
2730 | static int get_raid56_logic_offset(u64 physical, int num, | |
5a6ac9ea MX |
2731 | struct map_lookup *map, u64 *offset, |
2732 | u64 *stripe_start) | |
3b080b25 WS |
2733 | { |
2734 | int i; | |
2735 | int j = 0; | |
2736 | u64 stripe_nr; | |
2737 | u64 last_offset; | |
9d644a62 DS |
2738 | u32 stripe_index; |
2739 | u32 rot; | |
3b080b25 WS |
2740 | |
2741 | last_offset = (physical - map->stripes[num].physical) * | |
2742 | nr_data_stripes(map); | |
5a6ac9ea MX |
2743 | if (stripe_start) |
2744 | *stripe_start = last_offset; | |
2745 | ||
3b080b25 WS |
2746 | *offset = last_offset; |
2747 | for (i = 0; i < nr_data_stripes(map); i++) { | |
2748 | *offset = last_offset + i * map->stripe_len; | |
2749 | ||
b8b93add DS |
2750 | stripe_nr = div_u64(*offset, map->stripe_len); |
2751 | stripe_nr = div_u64(stripe_nr, nr_data_stripes(map)); | |
3b080b25 WS |
2752 | |
2753 | /* Work out the disk rotation on this stripe-set */ | |
47c5713f | 2754 | stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot); |
3b080b25 WS |
2755 | /* calculate which stripe this data locates */ |
2756 | rot += i; | |
e4fbaee2 | 2757 | stripe_index = rot % map->num_stripes; |
3b080b25 WS |
2758 | if (stripe_index == num) |
2759 | return 0; | |
2760 | if (stripe_index < num) | |
2761 | j++; | |
2762 | } | |
2763 | *offset = last_offset + j * map->stripe_len; | |
2764 | return 1; | |
2765 | } | |
2766 | ||
5a6ac9ea MX |
2767 | static void scrub_free_parity(struct scrub_parity *sparity) |
2768 | { | |
2769 | struct scrub_ctx *sctx = sparity->sctx; | |
2770 | struct scrub_page *curr, *next; | |
2771 | int nbits; | |
2772 | ||
2773 | nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors); | |
2774 | if (nbits) { | |
2775 | spin_lock(&sctx->stat_lock); | |
2776 | sctx->stat.read_errors += nbits; | |
2777 | sctx->stat.uncorrectable_errors += nbits; | |
2778 | spin_unlock(&sctx->stat_lock); | |
2779 | } | |
2780 | ||
2781 | list_for_each_entry_safe(curr, next, &sparity->spages, list) { | |
2782 | list_del_init(&curr->list); | |
2783 | scrub_page_put(curr); | |
2784 | } | |
2785 | ||
2786 | kfree(sparity); | |
2787 | } | |
2788 | ||
20b2e302 ZL |
2789 | static void scrub_parity_bio_endio_worker(struct btrfs_work *work) |
2790 | { | |
2791 | struct scrub_parity *sparity = container_of(work, struct scrub_parity, | |
2792 | work); | |
2793 | struct scrub_ctx *sctx = sparity->sctx; | |
2794 | ||
2795 | scrub_free_parity(sparity); | |
2796 | scrub_pending_bio_dec(sctx); | |
2797 | } | |
2798 | ||
4246a0b6 | 2799 | static void scrub_parity_bio_endio(struct bio *bio) |
5a6ac9ea MX |
2800 | { |
2801 | struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private; | |
5a6ac9ea | 2802 | |
4246a0b6 | 2803 | if (bio->bi_error) |
5a6ac9ea MX |
2804 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, |
2805 | sparity->nsectors); | |
2806 | ||
5a6ac9ea | 2807 | bio_put(bio); |
20b2e302 ZL |
2808 | |
2809 | btrfs_init_work(&sparity->work, btrfs_scrubparity_helper, | |
2810 | scrub_parity_bio_endio_worker, NULL, NULL); | |
2811 | btrfs_queue_work(sparity->sctx->dev_root->fs_info->scrub_parity_workers, | |
2812 | &sparity->work); | |
5a6ac9ea MX |
2813 | } |
2814 | ||
2815 | static void scrub_parity_check_and_repair(struct scrub_parity *sparity) | |
2816 | { | |
2817 | struct scrub_ctx *sctx = sparity->sctx; | |
2818 | struct bio *bio; | |
2819 | struct btrfs_raid_bio *rbio; | |
2820 | struct scrub_page *spage; | |
2821 | struct btrfs_bio *bbio = NULL; | |
5a6ac9ea MX |
2822 | u64 length; |
2823 | int ret; | |
2824 | ||
2825 | if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap, | |
2826 | sparity->nsectors)) | |
2827 | goto out; | |
2828 | ||
a0dd59de | 2829 | length = sparity->logic_end - sparity->logic_start; |
76035976 | 2830 | ret = btrfs_map_sblock(sctx->dev_root->fs_info, WRITE, |
5a6ac9ea | 2831 | sparity->logic_start, |
8e5cfb55 ZL |
2832 | &length, &bbio, 0, 1); |
2833 | if (ret || !bbio || !bbio->raid_map) | |
5a6ac9ea MX |
2834 | goto bbio_out; |
2835 | ||
2836 | bio = btrfs_io_bio_alloc(GFP_NOFS, 0); | |
2837 | if (!bio) | |
2838 | goto bbio_out; | |
2839 | ||
2840 | bio->bi_iter.bi_sector = sparity->logic_start >> 9; | |
2841 | bio->bi_private = sparity; | |
2842 | bio->bi_end_io = scrub_parity_bio_endio; | |
2843 | ||
2844 | rbio = raid56_parity_alloc_scrub_rbio(sctx->dev_root, bio, bbio, | |
8e5cfb55 | 2845 | length, sparity->scrub_dev, |
5a6ac9ea MX |
2846 | sparity->dbitmap, |
2847 | sparity->nsectors); | |
2848 | if (!rbio) | |
2849 | goto rbio_out; | |
2850 | ||
2851 | list_for_each_entry(spage, &sparity->spages, list) | |
b4ee1782 | 2852 | raid56_add_scrub_pages(rbio, spage->page, spage->logical); |
5a6ac9ea MX |
2853 | |
2854 | scrub_pending_bio_inc(sctx); | |
2855 | raid56_parity_submit_scrub_rbio(rbio); | |
2856 | return; | |
2857 | ||
2858 | rbio_out: | |
2859 | bio_put(bio); | |
2860 | bbio_out: | |
6e9606d2 | 2861 | btrfs_put_bbio(bbio); |
5a6ac9ea MX |
2862 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, |
2863 | sparity->nsectors); | |
2864 | spin_lock(&sctx->stat_lock); | |
2865 | sctx->stat.malloc_errors++; | |
2866 | spin_unlock(&sctx->stat_lock); | |
2867 | out: | |
2868 | scrub_free_parity(sparity); | |
2869 | } | |
2870 | ||
2871 | static inline int scrub_calc_parity_bitmap_len(int nsectors) | |
2872 | { | |
2873 | return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * (BITS_PER_LONG / 8); | |
2874 | } | |
2875 | ||
2876 | static void scrub_parity_get(struct scrub_parity *sparity) | |
2877 | { | |
57019345 | 2878 | atomic_inc(&sparity->refs); |
5a6ac9ea MX |
2879 | } |
2880 | ||
2881 | static void scrub_parity_put(struct scrub_parity *sparity) | |
2882 | { | |
57019345 | 2883 | if (!atomic_dec_and_test(&sparity->refs)) |
5a6ac9ea MX |
2884 | return; |
2885 | ||
2886 | scrub_parity_check_and_repair(sparity); | |
2887 | } | |
2888 | ||
2889 | static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, | |
2890 | struct map_lookup *map, | |
2891 | struct btrfs_device *sdev, | |
2892 | struct btrfs_path *path, | |
2893 | u64 logic_start, | |
2894 | u64 logic_end) | |
2895 | { | |
2896 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
2897 | struct btrfs_root *root = fs_info->extent_root; | |
2898 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2899 | struct btrfs_extent_item *extent; | |
4a770891 | 2900 | struct btrfs_bio *bbio = NULL; |
5a6ac9ea MX |
2901 | u64 flags; |
2902 | int ret; | |
2903 | int slot; | |
2904 | struct extent_buffer *l; | |
2905 | struct btrfs_key key; | |
2906 | u64 generation; | |
2907 | u64 extent_logical; | |
2908 | u64 extent_physical; | |
2909 | u64 extent_len; | |
4a770891 | 2910 | u64 mapped_length; |
5a6ac9ea MX |
2911 | struct btrfs_device *extent_dev; |
2912 | struct scrub_parity *sparity; | |
2913 | int nsectors; | |
2914 | int bitmap_len; | |
2915 | int extent_mirror_num; | |
2916 | int stop_loop = 0; | |
2917 | ||
2918 | nsectors = map->stripe_len / root->sectorsize; | |
2919 | bitmap_len = scrub_calc_parity_bitmap_len(nsectors); | |
2920 | sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len, | |
2921 | GFP_NOFS); | |
2922 | if (!sparity) { | |
2923 | spin_lock(&sctx->stat_lock); | |
2924 | sctx->stat.malloc_errors++; | |
2925 | spin_unlock(&sctx->stat_lock); | |
2926 | return -ENOMEM; | |
2927 | } | |
2928 | ||
2929 | sparity->stripe_len = map->stripe_len; | |
2930 | sparity->nsectors = nsectors; | |
2931 | sparity->sctx = sctx; | |
2932 | sparity->scrub_dev = sdev; | |
2933 | sparity->logic_start = logic_start; | |
2934 | sparity->logic_end = logic_end; | |
57019345 | 2935 | atomic_set(&sparity->refs, 1); |
5a6ac9ea MX |
2936 | INIT_LIST_HEAD(&sparity->spages); |
2937 | sparity->dbitmap = sparity->bitmap; | |
2938 | sparity->ebitmap = (void *)sparity->bitmap + bitmap_len; | |
2939 | ||
2940 | ret = 0; | |
2941 | while (logic_start < logic_end) { | |
2942 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) | |
2943 | key.type = BTRFS_METADATA_ITEM_KEY; | |
2944 | else | |
2945 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2946 | key.objectid = logic_start; | |
2947 | key.offset = (u64)-1; | |
2948 | ||
2949 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2950 | if (ret < 0) | |
2951 | goto out; | |
2952 | ||
2953 | if (ret > 0) { | |
2954 | ret = btrfs_previous_extent_item(root, path, 0); | |
2955 | if (ret < 0) | |
2956 | goto out; | |
2957 | if (ret > 0) { | |
2958 | btrfs_release_path(path); | |
2959 | ret = btrfs_search_slot(NULL, root, &key, | |
2960 | path, 0, 0); | |
2961 | if (ret < 0) | |
2962 | goto out; | |
2963 | } | |
2964 | } | |
2965 | ||
2966 | stop_loop = 0; | |
2967 | while (1) { | |
2968 | u64 bytes; | |
2969 | ||
2970 | l = path->nodes[0]; | |
2971 | slot = path->slots[0]; | |
2972 | if (slot >= btrfs_header_nritems(l)) { | |
2973 | ret = btrfs_next_leaf(root, path); | |
2974 | if (ret == 0) | |
2975 | continue; | |
2976 | if (ret < 0) | |
2977 | goto out; | |
2978 | ||
2979 | stop_loop = 1; | |
2980 | break; | |
2981 | } | |
2982 | btrfs_item_key_to_cpu(l, &key, slot); | |
2983 | ||
d7cad238 ZL |
2984 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
2985 | key.type != BTRFS_METADATA_ITEM_KEY) | |
2986 | goto next; | |
2987 | ||
5a6ac9ea MX |
2988 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
2989 | bytes = root->nodesize; | |
2990 | else | |
2991 | bytes = key.offset; | |
2992 | ||
2993 | if (key.objectid + bytes <= logic_start) | |
2994 | goto next; | |
2995 | ||
a0dd59de | 2996 | if (key.objectid >= logic_end) { |
5a6ac9ea MX |
2997 | stop_loop = 1; |
2998 | break; | |
2999 | } | |
3000 | ||
3001 | while (key.objectid >= logic_start + map->stripe_len) | |
3002 | logic_start += map->stripe_len; | |
3003 | ||
3004 | extent = btrfs_item_ptr(l, slot, | |
3005 | struct btrfs_extent_item); | |
3006 | flags = btrfs_extent_flags(l, extent); | |
3007 | generation = btrfs_extent_generation(l, extent); | |
3008 | ||
a323e813 ZL |
3009 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && |
3010 | (key.objectid < logic_start || | |
3011 | key.objectid + bytes > | |
3012 | logic_start + map->stripe_len)) { | |
3013 | btrfs_err(fs_info, "scrub: tree block %llu spanning stripes, ignored. logical=%llu", | |
3014 | key.objectid, logic_start); | |
5a6ac9ea MX |
3015 | goto next; |
3016 | } | |
3017 | again: | |
3018 | extent_logical = key.objectid; | |
3019 | extent_len = bytes; | |
3020 | ||
3021 | if (extent_logical < logic_start) { | |
3022 | extent_len -= logic_start - extent_logical; | |
3023 | extent_logical = logic_start; | |
3024 | } | |
3025 | ||
3026 | if (extent_logical + extent_len > | |
3027 | logic_start + map->stripe_len) | |
3028 | extent_len = logic_start + map->stripe_len - | |
3029 | extent_logical; | |
3030 | ||
3031 | scrub_parity_mark_sectors_data(sparity, extent_logical, | |
3032 | extent_len); | |
3033 | ||
4a770891 OS |
3034 | mapped_length = extent_len; |
3035 | ret = btrfs_map_block(fs_info, READ, extent_logical, | |
3036 | &mapped_length, &bbio, 0); | |
3037 | if (!ret) { | |
3038 | if (!bbio || mapped_length < extent_len) | |
3039 | ret = -EIO; | |
3040 | } | |
3041 | if (ret) { | |
3042 | btrfs_put_bbio(bbio); | |
3043 | goto out; | |
3044 | } | |
3045 | extent_physical = bbio->stripes[0].physical; | |
3046 | extent_mirror_num = bbio->mirror_num; | |
3047 | extent_dev = bbio->stripes[0].dev; | |
3048 | btrfs_put_bbio(bbio); | |
5a6ac9ea MX |
3049 | |
3050 | ret = btrfs_lookup_csums_range(csum_root, | |
3051 | extent_logical, | |
3052 | extent_logical + extent_len - 1, | |
3053 | &sctx->csum_list, 1); | |
3054 | if (ret) | |
3055 | goto out; | |
3056 | ||
3057 | ret = scrub_extent_for_parity(sparity, extent_logical, | |
3058 | extent_len, | |
3059 | extent_physical, | |
3060 | extent_dev, flags, | |
3061 | generation, | |
3062 | extent_mirror_num); | |
6fa96d72 ZL |
3063 | |
3064 | scrub_free_csums(sctx); | |
3065 | ||
5a6ac9ea MX |
3066 | if (ret) |
3067 | goto out; | |
3068 | ||
5a6ac9ea MX |
3069 | if (extent_logical + extent_len < |
3070 | key.objectid + bytes) { | |
3071 | logic_start += map->stripe_len; | |
3072 | ||
3073 | if (logic_start >= logic_end) { | |
3074 | stop_loop = 1; | |
3075 | break; | |
3076 | } | |
3077 | ||
3078 | if (logic_start < key.objectid + bytes) { | |
3079 | cond_resched(); | |
3080 | goto again; | |
3081 | } | |
3082 | } | |
3083 | next: | |
3084 | path->slots[0]++; | |
3085 | } | |
3086 | ||
3087 | btrfs_release_path(path); | |
3088 | ||
3089 | if (stop_loop) | |
3090 | break; | |
3091 | ||
3092 | logic_start += map->stripe_len; | |
3093 | } | |
3094 | out: | |
3095 | if (ret < 0) | |
3096 | scrub_parity_mark_sectors_error(sparity, logic_start, | |
a0dd59de | 3097 | logic_end - logic_start); |
5a6ac9ea MX |
3098 | scrub_parity_put(sparity); |
3099 | scrub_submit(sctx); | |
3100 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
3101 | scrub_wr_submit(sctx); | |
3102 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
3103 | ||
3104 | btrfs_release_path(path); | |
3105 | return ret < 0 ? ret : 0; | |
3106 | } | |
3107 | ||
d9d181c1 | 3108 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
a36cf8b8 SB |
3109 | struct map_lookup *map, |
3110 | struct btrfs_device *scrub_dev, | |
ff023aac SB |
3111 | int num, u64 base, u64 length, |
3112 | int is_dev_replace) | |
a2de733c | 3113 | { |
5a6ac9ea | 3114 | struct btrfs_path *path, *ppath; |
a36cf8b8 | 3115 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
a2de733c AJ |
3116 | struct btrfs_root *root = fs_info->extent_root; |
3117 | struct btrfs_root *csum_root = fs_info->csum_root; | |
3118 | struct btrfs_extent_item *extent; | |
e7786c3a | 3119 | struct blk_plug plug; |
a2de733c AJ |
3120 | u64 flags; |
3121 | int ret; | |
3122 | int slot; | |
a2de733c | 3123 | u64 nstripes; |
a2de733c AJ |
3124 | struct extent_buffer *l; |
3125 | struct btrfs_key key; | |
3126 | u64 physical; | |
3127 | u64 logical; | |
625f1c8d | 3128 | u64 logic_end; |
3b080b25 | 3129 | u64 physical_end; |
a2de733c | 3130 | u64 generation; |
e12fa9cd | 3131 | int mirror_num; |
7a26285e AJ |
3132 | struct reada_control *reada1; |
3133 | struct reada_control *reada2; | |
3134 | struct btrfs_key key_start; | |
3135 | struct btrfs_key key_end; | |
a2de733c AJ |
3136 | u64 increment = map->stripe_len; |
3137 | u64 offset; | |
ff023aac SB |
3138 | u64 extent_logical; |
3139 | u64 extent_physical; | |
3140 | u64 extent_len; | |
5a6ac9ea MX |
3141 | u64 stripe_logical; |
3142 | u64 stripe_end; | |
ff023aac SB |
3143 | struct btrfs_device *extent_dev; |
3144 | int extent_mirror_num; | |
3b080b25 | 3145 | int stop_loop = 0; |
53b381b3 | 3146 | |
3b080b25 | 3147 | physical = map->stripes[num].physical; |
a2de733c | 3148 | offset = 0; |
b8b93add | 3149 | nstripes = div_u64(length, map->stripe_len); |
a2de733c AJ |
3150 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
3151 | offset = map->stripe_len * num; | |
3152 | increment = map->stripe_len * map->num_stripes; | |
193ea74b | 3153 | mirror_num = 1; |
a2de733c AJ |
3154 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
3155 | int factor = map->num_stripes / map->sub_stripes; | |
3156 | offset = map->stripe_len * (num / map->sub_stripes); | |
3157 | increment = map->stripe_len * factor; | |
193ea74b | 3158 | mirror_num = num % map->sub_stripes + 1; |
a2de733c AJ |
3159 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
3160 | increment = map->stripe_len; | |
193ea74b | 3161 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
3162 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
3163 | increment = map->stripe_len; | |
193ea74b | 3164 | mirror_num = num % map->num_stripes + 1; |
ffe2d203 | 3165 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
5a6ac9ea | 3166 | get_raid56_logic_offset(physical, num, map, &offset, NULL); |
3b080b25 WS |
3167 | increment = map->stripe_len * nr_data_stripes(map); |
3168 | mirror_num = 1; | |
a2de733c AJ |
3169 | } else { |
3170 | increment = map->stripe_len; | |
193ea74b | 3171 | mirror_num = 1; |
a2de733c AJ |
3172 | } |
3173 | ||
3174 | path = btrfs_alloc_path(); | |
3175 | if (!path) | |
3176 | return -ENOMEM; | |
3177 | ||
5a6ac9ea MX |
3178 | ppath = btrfs_alloc_path(); |
3179 | if (!ppath) { | |
379d6854 | 3180 | btrfs_free_path(path); |
5a6ac9ea MX |
3181 | return -ENOMEM; |
3182 | } | |
3183 | ||
b5d67f64 SB |
3184 | /* |
3185 | * work on commit root. The related disk blocks are static as | |
3186 | * long as COW is applied. This means, it is save to rewrite | |
3187 | * them to repair disk errors without any race conditions | |
3188 | */ | |
a2de733c AJ |
3189 | path->search_commit_root = 1; |
3190 | path->skip_locking = 1; | |
3191 | ||
063c54dc GH |
3192 | ppath->search_commit_root = 1; |
3193 | ppath->skip_locking = 1; | |
a2de733c | 3194 | /* |
7a26285e AJ |
3195 | * trigger the readahead for extent tree csum tree and wait for |
3196 | * completion. During readahead, the scrub is officially paused | |
3197 | * to not hold off transaction commits | |
a2de733c AJ |
3198 | */ |
3199 | logical = base + offset; | |
3b080b25 | 3200 | physical_end = physical + nstripes * map->stripe_len; |
ffe2d203 | 3201 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3b080b25 | 3202 | get_raid56_logic_offset(physical_end, num, |
5a6ac9ea | 3203 | map, &logic_end, NULL); |
3b080b25 WS |
3204 | logic_end += base; |
3205 | } else { | |
3206 | logic_end = logical + increment * nstripes; | |
3207 | } | |
d9d181c1 | 3208 | wait_event(sctx->list_wait, |
b6bfebc1 | 3209 | atomic_read(&sctx->bios_in_flight) == 0); |
cb7ab021 | 3210 | scrub_blocked_if_needed(fs_info); |
7a26285e AJ |
3211 | |
3212 | /* FIXME it might be better to start readahead at commit root */ | |
3213 | key_start.objectid = logical; | |
3214 | key_start.type = BTRFS_EXTENT_ITEM_KEY; | |
3215 | key_start.offset = (u64)0; | |
3b080b25 | 3216 | key_end.objectid = logic_end; |
3173a18f JB |
3217 | key_end.type = BTRFS_METADATA_ITEM_KEY; |
3218 | key_end.offset = (u64)-1; | |
7a26285e AJ |
3219 | reada1 = btrfs_reada_add(root, &key_start, &key_end); |
3220 | ||
3221 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
3222 | key_start.type = BTRFS_EXTENT_CSUM_KEY; | |
3223 | key_start.offset = logical; | |
3224 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
3225 | key_end.type = BTRFS_EXTENT_CSUM_KEY; | |
3b080b25 | 3226 | key_end.offset = logic_end; |
7a26285e AJ |
3227 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); |
3228 | ||
3229 | if (!IS_ERR(reada1)) | |
3230 | btrfs_reada_wait(reada1); | |
3231 | if (!IS_ERR(reada2)) | |
3232 | btrfs_reada_wait(reada2); | |
3233 | ||
a2de733c AJ |
3234 | |
3235 | /* | |
3236 | * collect all data csums for the stripe to avoid seeking during | |
3237 | * the scrub. This might currently (crc32) end up to be about 1MB | |
3238 | */ | |
e7786c3a | 3239 | blk_start_plug(&plug); |
a2de733c | 3240 | |
a2de733c AJ |
3241 | /* |
3242 | * now find all extents for each stripe and scrub them | |
3243 | */ | |
a2de733c | 3244 | ret = 0; |
3b080b25 | 3245 | while (physical < physical_end) { |
a2de733c AJ |
3246 | /* |
3247 | * canceled? | |
3248 | */ | |
3249 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
d9d181c1 | 3250 | atomic_read(&sctx->cancel_req)) { |
a2de733c AJ |
3251 | ret = -ECANCELED; |
3252 | goto out; | |
3253 | } | |
3254 | /* | |
3255 | * check to see if we have to pause | |
3256 | */ | |
3257 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
3258 | /* push queued extents */ | |
ff023aac | 3259 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
d9d181c1 | 3260 | scrub_submit(sctx); |
ff023aac SB |
3261 | mutex_lock(&sctx->wr_ctx.wr_lock); |
3262 | scrub_wr_submit(sctx); | |
3263 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
d9d181c1 | 3264 | wait_event(sctx->list_wait, |
b6bfebc1 | 3265 | atomic_read(&sctx->bios_in_flight) == 0); |
ff023aac | 3266 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
3cb0929a | 3267 | scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3268 | } |
3269 | ||
f2f66a2f ZL |
3270 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3271 | ret = get_raid56_logic_offset(physical, num, map, | |
3272 | &logical, | |
3273 | &stripe_logical); | |
3274 | logical += base; | |
3275 | if (ret) { | |
7955323b | 3276 | /* it is parity strip */ |
f2f66a2f | 3277 | stripe_logical += base; |
a0dd59de | 3278 | stripe_end = stripe_logical + increment; |
f2f66a2f ZL |
3279 | ret = scrub_raid56_parity(sctx, map, scrub_dev, |
3280 | ppath, stripe_logical, | |
3281 | stripe_end); | |
3282 | if (ret) | |
3283 | goto out; | |
3284 | goto skip; | |
3285 | } | |
3286 | } | |
3287 | ||
7c76edb7 WS |
3288 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
3289 | key.type = BTRFS_METADATA_ITEM_KEY; | |
3290 | else | |
3291 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
a2de733c | 3292 | key.objectid = logical; |
625f1c8d | 3293 | key.offset = (u64)-1; |
a2de733c AJ |
3294 | |
3295 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3296 | if (ret < 0) | |
3297 | goto out; | |
3173a18f | 3298 | |
8c51032f | 3299 | if (ret > 0) { |
ade2e0b3 | 3300 | ret = btrfs_previous_extent_item(root, path, 0); |
a2de733c AJ |
3301 | if (ret < 0) |
3302 | goto out; | |
8c51032f AJ |
3303 | if (ret > 0) { |
3304 | /* there's no smaller item, so stick with the | |
3305 | * larger one */ | |
3306 | btrfs_release_path(path); | |
3307 | ret = btrfs_search_slot(NULL, root, &key, | |
3308 | path, 0, 0); | |
3309 | if (ret < 0) | |
3310 | goto out; | |
3311 | } | |
a2de733c AJ |
3312 | } |
3313 | ||
625f1c8d | 3314 | stop_loop = 0; |
a2de733c | 3315 | while (1) { |
3173a18f JB |
3316 | u64 bytes; |
3317 | ||
a2de733c AJ |
3318 | l = path->nodes[0]; |
3319 | slot = path->slots[0]; | |
3320 | if (slot >= btrfs_header_nritems(l)) { | |
3321 | ret = btrfs_next_leaf(root, path); | |
3322 | if (ret == 0) | |
3323 | continue; | |
3324 | if (ret < 0) | |
3325 | goto out; | |
3326 | ||
625f1c8d | 3327 | stop_loop = 1; |
a2de733c AJ |
3328 | break; |
3329 | } | |
3330 | btrfs_item_key_to_cpu(l, &key, slot); | |
3331 | ||
d7cad238 ZL |
3332 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
3333 | key.type != BTRFS_METADATA_ITEM_KEY) | |
3334 | goto next; | |
3335 | ||
3173a18f | 3336 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
707e8a07 | 3337 | bytes = root->nodesize; |
3173a18f JB |
3338 | else |
3339 | bytes = key.offset; | |
3340 | ||
3341 | if (key.objectid + bytes <= logical) | |
a2de733c AJ |
3342 | goto next; |
3343 | ||
625f1c8d LB |
3344 | if (key.objectid >= logical + map->stripe_len) { |
3345 | /* out of this device extent */ | |
3346 | if (key.objectid >= logic_end) | |
3347 | stop_loop = 1; | |
3348 | break; | |
3349 | } | |
a2de733c AJ |
3350 | |
3351 | extent = btrfs_item_ptr(l, slot, | |
3352 | struct btrfs_extent_item); | |
3353 | flags = btrfs_extent_flags(l, extent); | |
3354 | generation = btrfs_extent_generation(l, extent); | |
3355 | ||
a323e813 ZL |
3356 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && |
3357 | (key.objectid < logical || | |
3358 | key.objectid + bytes > | |
3359 | logical + map->stripe_len)) { | |
efe120a0 FH |
3360 | btrfs_err(fs_info, |
3361 | "scrub: tree block %llu spanning " | |
3362 | "stripes, ignored. logical=%llu", | |
c1c9ff7c | 3363 | key.objectid, logical); |
a2de733c AJ |
3364 | goto next; |
3365 | } | |
3366 | ||
625f1c8d LB |
3367 | again: |
3368 | extent_logical = key.objectid; | |
3369 | extent_len = bytes; | |
3370 | ||
a2de733c AJ |
3371 | /* |
3372 | * trim extent to this stripe | |
3373 | */ | |
625f1c8d LB |
3374 | if (extent_logical < logical) { |
3375 | extent_len -= logical - extent_logical; | |
3376 | extent_logical = logical; | |
a2de733c | 3377 | } |
625f1c8d | 3378 | if (extent_logical + extent_len > |
a2de733c | 3379 | logical + map->stripe_len) { |
625f1c8d LB |
3380 | extent_len = logical + map->stripe_len - |
3381 | extent_logical; | |
a2de733c AJ |
3382 | } |
3383 | ||
625f1c8d | 3384 | extent_physical = extent_logical - logical + physical; |
ff023aac SB |
3385 | extent_dev = scrub_dev; |
3386 | extent_mirror_num = mirror_num; | |
3387 | if (is_dev_replace) | |
3388 | scrub_remap_extent(fs_info, extent_logical, | |
3389 | extent_len, &extent_physical, | |
3390 | &extent_dev, | |
3391 | &extent_mirror_num); | |
625f1c8d | 3392 | |
fe8cf654 ZL |
3393 | ret = btrfs_lookup_csums_range(csum_root, |
3394 | extent_logical, | |
3395 | extent_logical + | |
3396 | extent_len - 1, | |
3397 | &sctx->csum_list, 1); | |
625f1c8d LB |
3398 | if (ret) |
3399 | goto out; | |
3400 | ||
ff023aac SB |
3401 | ret = scrub_extent(sctx, extent_logical, extent_len, |
3402 | extent_physical, extent_dev, flags, | |
3403 | generation, extent_mirror_num, | |
115930cb | 3404 | extent_logical - logical + physical); |
6fa96d72 ZL |
3405 | |
3406 | scrub_free_csums(sctx); | |
3407 | ||
a2de733c AJ |
3408 | if (ret) |
3409 | goto out; | |
3410 | ||
625f1c8d LB |
3411 | if (extent_logical + extent_len < |
3412 | key.objectid + bytes) { | |
ffe2d203 | 3413 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3b080b25 WS |
3414 | /* |
3415 | * loop until we find next data stripe | |
3416 | * or we have finished all stripes. | |
3417 | */ | |
5a6ac9ea MX |
3418 | loop: |
3419 | physical += map->stripe_len; | |
3420 | ret = get_raid56_logic_offset(physical, | |
3421 | num, map, &logical, | |
3422 | &stripe_logical); | |
3423 | logical += base; | |
3424 | ||
3425 | if (ret && physical < physical_end) { | |
3426 | stripe_logical += base; | |
3427 | stripe_end = stripe_logical + | |
a0dd59de | 3428 | increment; |
5a6ac9ea MX |
3429 | ret = scrub_raid56_parity(sctx, |
3430 | map, scrub_dev, ppath, | |
3431 | stripe_logical, | |
3432 | stripe_end); | |
3433 | if (ret) | |
3434 | goto out; | |
3435 | goto loop; | |
3436 | } | |
3b080b25 WS |
3437 | } else { |
3438 | physical += map->stripe_len; | |
3439 | logical += increment; | |
3440 | } | |
625f1c8d LB |
3441 | if (logical < key.objectid + bytes) { |
3442 | cond_resched(); | |
3443 | goto again; | |
3444 | } | |
3445 | ||
3b080b25 | 3446 | if (physical >= physical_end) { |
625f1c8d LB |
3447 | stop_loop = 1; |
3448 | break; | |
3449 | } | |
3450 | } | |
a2de733c AJ |
3451 | next: |
3452 | path->slots[0]++; | |
3453 | } | |
71267333 | 3454 | btrfs_release_path(path); |
3b080b25 | 3455 | skip: |
a2de733c AJ |
3456 | logical += increment; |
3457 | physical += map->stripe_len; | |
d9d181c1 | 3458 | spin_lock(&sctx->stat_lock); |
625f1c8d LB |
3459 | if (stop_loop) |
3460 | sctx->stat.last_physical = map->stripes[num].physical + | |
3461 | length; | |
3462 | else | |
3463 | sctx->stat.last_physical = physical; | |
d9d181c1 | 3464 | spin_unlock(&sctx->stat_lock); |
625f1c8d LB |
3465 | if (stop_loop) |
3466 | break; | |
a2de733c | 3467 | } |
ff023aac | 3468 | out: |
a2de733c | 3469 | /* push queued extents */ |
d9d181c1 | 3470 | scrub_submit(sctx); |
ff023aac SB |
3471 | mutex_lock(&sctx->wr_ctx.wr_lock); |
3472 | scrub_wr_submit(sctx); | |
3473 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
a2de733c | 3474 | |
e7786c3a | 3475 | blk_finish_plug(&plug); |
a2de733c | 3476 | btrfs_free_path(path); |
5a6ac9ea | 3477 | btrfs_free_path(ppath); |
a2de733c AJ |
3478 | return ret < 0 ? ret : 0; |
3479 | } | |
3480 | ||
d9d181c1 | 3481 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
a36cf8b8 | 3482 | struct btrfs_device *scrub_dev, |
a36cf8b8 | 3483 | u64 chunk_offset, u64 length, |
ff023aac | 3484 | u64 dev_offset, int is_dev_replace) |
a2de733c AJ |
3485 | { |
3486 | struct btrfs_mapping_tree *map_tree = | |
a36cf8b8 | 3487 | &sctx->dev_root->fs_info->mapping_tree; |
a2de733c AJ |
3488 | struct map_lookup *map; |
3489 | struct extent_map *em; | |
3490 | int i; | |
ff023aac | 3491 | int ret = 0; |
a2de733c AJ |
3492 | |
3493 | read_lock(&map_tree->map_tree.lock); | |
3494 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | |
3495 | read_unlock(&map_tree->map_tree.lock); | |
3496 | ||
3497 | if (!em) | |
3498 | return -EINVAL; | |
3499 | ||
3500 | map = (struct map_lookup *)em->bdev; | |
3501 | if (em->start != chunk_offset) | |
3502 | goto out; | |
3503 | ||
3504 | if (em->len < length) | |
3505 | goto out; | |
3506 | ||
3507 | for (i = 0; i < map->num_stripes; ++i) { | |
a36cf8b8 | 3508 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
859acaf1 | 3509 | map->stripes[i].physical == dev_offset) { |
a36cf8b8 | 3510 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
ff023aac SB |
3511 | chunk_offset, length, |
3512 | is_dev_replace); | |
a2de733c AJ |
3513 | if (ret) |
3514 | goto out; | |
3515 | } | |
3516 | } | |
3517 | out: | |
3518 | free_extent_map(em); | |
3519 | ||
3520 | return ret; | |
3521 | } | |
3522 | ||
3523 | static noinline_for_stack | |
a36cf8b8 | 3524 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
ff023aac SB |
3525 | struct btrfs_device *scrub_dev, u64 start, u64 end, |
3526 | int is_dev_replace) | |
a2de733c AJ |
3527 | { |
3528 | struct btrfs_dev_extent *dev_extent = NULL; | |
3529 | struct btrfs_path *path; | |
a36cf8b8 | 3530 | struct btrfs_root *root = sctx->dev_root; |
a2de733c AJ |
3531 | struct btrfs_fs_info *fs_info = root->fs_info; |
3532 | u64 length; | |
a2de733c | 3533 | u64 chunk_offset; |
55e3a601 | 3534 | int ret = 0; |
a2de733c AJ |
3535 | int slot; |
3536 | struct extent_buffer *l; | |
3537 | struct btrfs_key key; | |
3538 | struct btrfs_key found_key; | |
3539 | struct btrfs_block_group_cache *cache; | |
ff023aac | 3540 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
a2de733c AJ |
3541 | |
3542 | path = btrfs_alloc_path(); | |
3543 | if (!path) | |
3544 | return -ENOMEM; | |
3545 | ||
3546 | path->reada = 2; | |
3547 | path->search_commit_root = 1; | |
3548 | path->skip_locking = 1; | |
3549 | ||
a36cf8b8 | 3550 | key.objectid = scrub_dev->devid; |
a2de733c AJ |
3551 | key.offset = 0ull; |
3552 | key.type = BTRFS_DEV_EXTENT_KEY; | |
3553 | ||
a2de733c AJ |
3554 | while (1) { |
3555 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3556 | if (ret < 0) | |
8c51032f AJ |
3557 | break; |
3558 | if (ret > 0) { | |
3559 | if (path->slots[0] >= | |
3560 | btrfs_header_nritems(path->nodes[0])) { | |
3561 | ret = btrfs_next_leaf(root, path); | |
55e3a601 Z |
3562 | if (ret < 0) |
3563 | break; | |
3564 | if (ret > 0) { | |
3565 | ret = 0; | |
8c51032f | 3566 | break; |
55e3a601 Z |
3567 | } |
3568 | } else { | |
3569 | ret = 0; | |
8c51032f AJ |
3570 | } |
3571 | } | |
a2de733c AJ |
3572 | |
3573 | l = path->nodes[0]; | |
3574 | slot = path->slots[0]; | |
3575 | ||
3576 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
3577 | ||
a36cf8b8 | 3578 | if (found_key.objectid != scrub_dev->devid) |
a2de733c AJ |
3579 | break; |
3580 | ||
962a298f | 3581 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) |
a2de733c AJ |
3582 | break; |
3583 | ||
3584 | if (found_key.offset >= end) | |
3585 | break; | |
3586 | ||
3587 | if (found_key.offset < key.offset) | |
3588 | break; | |
3589 | ||
3590 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
3591 | length = btrfs_dev_extent_length(l, dev_extent); | |
3592 | ||
ced96edc QW |
3593 | if (found_key.offset + length <= start) |
3594 | goto skip; | |
a2de733c | 3595 | |
a2de733c AJ |
3596 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); |
3597 | ||
3598 | /* | |
3599 | * get a reference on the corresponding block group to prevent | |
3600 | * the chunk from going away while we scrub it | |
3601 | */ | |
3602 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
ced96edc QW |
3603 | |
3604 | /* some chunks are removed but not committed to disk yet, | |
3605 | * continue scrubbing */ | |
3606 | if (!cache) | |
3607 | goto skip; | |
3608 | ||
55e3a601 Z |
3609 | /* |
3610 | * we need call btrfs_inc_block_group_ro() with scrubs_paused, | |
3611 | * to avoid deadlock caused by: | |
3612 | * btrfs_inc_block_group_ro() | |
3613 | * -> btrfs_wait_for_commit() | |
3614 | * -> btrfs_commit_transaction() | |
3615 | * -> btrfs_scrub_pause() | |
3616 | */ | |
3617 | scrub_pause_on(fs_info); | |
3618 | ret = btrfs_inc_block_group_ro(root, cache); | |
3619 | scrub_pause_off(fs_info); | |
3620 | if (ret) { | |
3621 | btrfs_put_block_group(cache); | |
3622 | break; | |
3623 | } | |
3624 | ||
ff023aac SB |
3625 | dev_replace->cursor_right = found_key.offset + length; |
3626 | dev_replace->cursor_left = found_key.offset; | |
3627 | dev_replace->item_needs_writeback = 1; | |
8c204c96 ZL |
3628 | ret = scrub_chunk(sctx, scrub_dev, chunk_offset, length, |
3629 | found_key.offset, is_dev_replace); | |
ff023aac SB |
3630 | |
3631 | /* | |
3632 | * flush, submit all pending read and write bios, afterwards | |
3633 | * wait for them. | |
3634 | * Note that in the dev replace case, a read request causes | |
3635 | * write requests that are submitted in the read completion | |
3636 | * worker. Therefore in the current situation, it is required | |
3637 | * that all write requests are flushed, so that all read and | |
3638 | * write requests are really completed when bios_in_flight | |
3639 | * changes to 0. | |
3640 | */ | |
3641 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); | |
3642 | scrub_submit(sctx); | |
3643 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
3644 | scrub_wr_submit(sctx); | |
3645 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
3646 | ||
3647 | wait_event(sctx->list_wait, | |
3648 | atomic_read(&sctx->bios_in_flight) == 0); | |
b708ce96 Z |
3649 | |
3650 | scrub_pause_on(fs_info); | |
12cf9372 WS |
3651 | |
3652 | /* | |
3653 | * must be called before we decrease @scrub_paused. | |
3654 | * make sure we don't block transaction commit while | |
3655 | * we are waiting pending workers finished. | |
3656 | */ | |
ff023aac SB |
3657 | wait_event(sctx->list_wait, |
3658 | atomic_read(&sctx->workers_pending) == 0); | |
12cf9372 WS |
3659 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
3660 | ||
b708ce96 | 3661 | scrub_pause_off(fs_info); |
ff023aac | 3662 | |
55e3a601 | 3663 | btrfs_dec_block_group_ro(root, cache); |
ff023aac | 3664 | |
a2de733c AJ |
3665 | btrfs_put_block_group(cache); |
3666 | if (ret) | |
3667 | break; | |
af1be4f8 SB |
3668 | if (is_dev_replace && |
3669 | atomic64_read(&dev_replace->num_write_errors) > 0) { | |
ff023aac SB |
3670 | ret = -EIO; |
3671 | break; | |
3672 | } | |
3673 | if (sctx->stat.malloc_errors > 0) { | |
3674 | ret = -ENOMEM; | |
3675 | break; | |
3676 | } | |
a2de733c | 3677 | |
539f358a ID |
3678 | dev_replace->cursor_left = dev_replace->cursor_right; |
3679 | dev_replace->item_needs_writeback = 1; | |
ced96edc | 3680 | skip: |
a2de733c | 3681 | key.offset = found_key.offset + length; |
71267333 | 3682 | btrfs_release_path(path); |
a2de733c AJ |
3683 | } |
3684 | ||
a2de733c | 3685 | btrfs_free_path(path); |
8c51032f | 3686 | |
55e3a601 | 3687 | return ret; |
a2de733c AJ |
3688 | } |
3689 | ||
a36cf8b8 SB |
3690 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
3691 | struct btrfs_device *scrub_dev) | |
a2de733c AJ |
3692 | { |
3693 | int i; | |
3694 | u64 bytenr; | |
3695 | u64 gen; | |
3696 | int ret; | |
a36cf8b8 | 3697 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 3698 | |
87533c47 | 3699 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
79787eaa JM |
3700 | return -EIO; |
3701 | ||
5f546063 MX |
3702 | /* Seed devices of a new filesystem has their own generation. */ |
3703 | if (scrub_dev->fs_devices != root->fs_info->fs_devices) | |
3704 | gen = scrub_dev->generation; | |
3705 | else | |
3706 | gen = root->fs_info->last_trans_committed; | |
a2de733c AJ |
3707 | |
3708 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
3709 | bytenr = btrfs_sb_offset(i); | |
935e5cc9 MX |
3710 | if (bytenr + BTRFS_SUPER_INFO_SIZE > |
3711 | scrub_dev->commit_total_bytes) | |
a2de733c AJ |
3712 | break; |
3713 | ||
d9d181c1 | 3714 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
a36cf8b8 | 3715 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
ff023aac | 3716 | NULL, 1, bytenr); |
a2de733c AJ |
3717 | if (ret) |
3718 | return ret; | |
3719 | } | |
b6bfebc1 | 3720 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3721 | |
3722 | return 0; | |
3723 | } | |
3724 | ||
3725 | /* | |
3726 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
3727 | */ | |
ff023aac SB |
3728 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
3729 | int is_dev_replace) | |
a2de733c | 3730 | { |
6f011058 | 3731 | unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND; |
0339ef2f | 3732 | int max_active = fs_info->thread_pool_size; |
a2de733c | 3733 | |
632dd772 | 3734 | if (fs_info->scrub_workers_refcnt == 0) { |
ff023aac | 3735 | if (is_dev_replace) |
0339ef2f QW |
3736 | fs_info->scrub_workers = |
3737 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
3738 | 1, 4); | |
ff023aac | 3739 | else |
0339ef2f QW |
3740 | fs_info->scrub_workers = |
3741 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
3742 | max_active, 4); | |
e82afc52 ZL |
3743 | if (!fs_info->scrub_workers) |
3744 | goto fail_scrub_workers; | |
3745 | ||
0339ef2f QW |
3746 | fs_info->scrub_wr_completion_workers = |
3747 | btrfs_alloc_workqueue("btrfs-scrubwrc", flags, | |
3748 | max_active, 2); | |
e82afc52 ZL |
3749 | if (!fs_info->scrub_wr_completion_workers) |
3750 | goto fail_scrub_wr_completion_workers; | |
3751 | ||
0339ef2f QW |
3752 | fs_info->scrub_nocow_workers = |
3753 | btrfs_alloc_workqueue("btrfs-scrubnc", flags, 1, 0); | |
e82afc52 ZL |
3754 | if (!fs_info->scrub_nocow_workers) |
3755 | goto fail_scrub_nocow_workers; | |
20b2e302 ZL |
3756 | fs_info->scrub_parity_workers = |
3757 | btrfs_alloc_workqueue("btrfs-scrubparity", flags, | |
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: | |
3766 | btrfs_destroy_workqueue(fs_info->scrub_nocow_workers); | |
3767 | fail_scrub_nocow_workers: | |
3768 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); | |
3769 | fail_scrub_wr_completion_workers: | |
3770 | btrfs_destroy_workqueue(fs_info->scrub_workers); | |
3771 | fail_scrub_workers: | |
3772 | return -ENOMEM; | |
a2de733c AJ |
3773 | } |
3774 | ||
aa1b8cd4 | 3775 | static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info) |
a2de733c | 3776 | { |
ff023aac | 3777 | if (--fs_info->scrub_workers_refcnt == 0) { |
0339ef2f QW |
3778 | btrfs_destroy_workqueue(fs_info->scrub_workers); |
3779 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); | |
3780 | btrfs_destroy_workqueue(fs_info->scrub_nocow_workers); | |
20b2e302 | 3781 | btrfs_destroy_workqueue(fs_info->scrub_parity_workers); |
ff023aac | 3782 | } |
a2de733c | 3783 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
a2de733c AJ |
3784 | } |
3785 | ||
aa1b8cd4 SB |
3786 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
3787 | u64 end, struct btrfs_scrub_progress *progress, | |
63a212ab | 3788 | int readonly, int is_dev_replace) |
a2de733c | 3789 | { |
d9d181c1 | 3790 | struct scrub_ctx *sctx; |
a2de733c AJ |
3791 | int ret; |
3792 | struct btrfs_device *dev; | |
5d68da3b | 3793 | struct rcu_string *name; |
a2de733c | 3794 | |
aa1b8cd4 | 3795 | if (btrfs_fs_closing(fs_info)) |
a2de733c AJ |
3796 | return -EINVAL; |
3797 | ||
aa1b8cd4 | 3798 | if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) { |
b5d67f64 SB |
3799 | /* |
3800 | * in this case scrub is unable to calculate the checksum | |
3801 | * the way scrub is implemented. Do not handle this | |
3802 | * situation at all because it won't ever happen. | |
3803 | */ | |
efe120a0 FH |
3804 | btrfs_err(fs_info, |
3805 | "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails", | |
aa1b8cd4 | 3806 | fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN); |
b5d67f64 SB |
3807 | return -EINVAL; |
3808 | } | |
3809 | ||
aa1b8cd4 | 3810 | if (fs_info->chunk_root->sectorsize != PAGE_SIZE) { |
b5d67f64 | 3811 | /* not supported for data w/o checksums */ |
efe120a0 FH |
3812 | btrfs_err(fs_info, |
3813 | "scrub: size assumption sectorsize != PAGE_SIZE " | |
3814 | "(%d != %lu) fails", | |
27f9f023 | 3815 | fs_info->chunk_root->sectorsize, PAGE_SIZE); |
a2de733c AJ |
3816 | return -EINVAL; |
3817 | } | |
3818 | ||
7a9e9987 SB |
3819 | if (fs_info->chunk_root->nodesize > |
3820 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || | |
3821 | fs_info->chunk_root->sectorsize > | |
3822 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { | |
3823 | /* | |
3824 | * would exhaust the array bounds of pagev member in | |
3825 | * struct scrub_block | |
3826 | */ | |
efe120a0 FH |
3827 | btrfs_err(fs_info, "scrub: size assumption nodesize and sectorsize " |
3828 | "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails", | |
7a9e9987 SB |
3829 | fs_info->chunk_root->nodesize, |
3830 | SCRUB_MAX_PAGES_PER_BLOCK, | |
3831 | fs_info->chunk_root->sectorsize, | |
3832 | SCRUB_MAX_PAGES_PER_BLOCK); | |
3833 | return -EINVAL; | |
3834 | } | |
3835 | ||
a2de733c | 3836 | |
aa1b8cd4 SB |
3837 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
3838 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); | |
63a212ab | 3839 | if (!dev || (dev->missing && !is_dev_replace)) { |
aa1b8cd4 | 3840 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
3841 | return -ENODEV; |
3842 | } | |
a2de733c | 3843 | |
5d68da3b MX |
3844 | if (!is_dev_replace && !readonly && !dev->writeable) { |
3845 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
3846 | rcu_read_lock(); | |
3847 | name = rcu_dereference(dev->name); | |
3848 | btrfs_err(fs_info, "scrub: device %s is not writable", | |
3849 | name->str); | |
3850 | rcu_read_unlock(); | |
3851 | return -EROFS; | |
3852 | } | |
3853 | ||
3b7a016f | 3854 | mutex_lock(&fs_info->scrub_lock); |
63a212ab | 3855 | if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) { |
a2de733c | 3856 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3857 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
aa1b8cd4 | 3858 | return -EIO; |
a2de733c AJ |
3859 | } |
3860 | ||
8dabb742 SB |
3861 | btrfs_dev_replace_lock(&fs_info->dev_replace); |
3862 | if (dev->scrub_device || | |
3863 | (!is_dev_replace && | |
3864 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { | |
3865 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
a2de733c | 3866 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3867 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
3868 | return -EINPROGRESS; |
3869 | } | |
8dabb742 | 3870 | btrfs_dev_replace_unlock(&fs_info->dev_replace); |
3b7a016f WS |
3871 | |
3872 | ret = scrub_workers_get(fs_info, is_dev_replace); | |
3873 | if (ret) { | |
3874 | mutex_unlock(&fs_info->scrub_lock); | |
3875 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
3876 | return ret; | |
3877 | } | |
3878 | ||
63a212ab | 3879 | sctx = scrub_setup_ctx(dev, is_dev_replace); |
d9d181c1 | 3880 | if (IS_ERR(sctx)) { |
a2de733c | 3881 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 SB |
3882 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
3883 | scrub_workers_put(fs_info); | |
d9d181c1 | 3884 | return PTR_ERR(sctx); |
a2de733c | 3885 | } |
d9d181c1 SB |
3886 | sctx->readonly = readonly; |
3887 | dev->scrub_device = sctx; | |
3cb0929a | 3888 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 3889 | |
3cb0929a WS |
3890 | /* |
3891 | * checking @scrub_pause_req here, we can avoid | |
3892 | * race between committing transaction and scrubbing. | |
3893 | */ | |
cb7ab021 | 3894 | __scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3895 | atomic_inc(&fs_info->scrubs_running); |
3896 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c | 3897 | |
ff023aac | 3898 | if (!is_dev_replace) { |
9b011adf WS |
3899 | /* |
3900 | * by holding device list mutex, we can | |
3901 | * kick off writing super in log tree sync. | |
3902 | */ | |
3cb0929a | 3903 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3904 | ret = scrub_supers(sctx, dev); |
3cb0929a | 3905 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3906 | } |
a2de733c AJ |
3907 | |
3908 | if (!ret) | |
ff023aac SB |
3909 | ret = scrub_enumerate_chunks(sctx, dev, start, end, |
3910 | is_dev_replace); | |
a2de733c | 3911 | |
b6bfebc1 | 3912 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3913 | atomic_dec(&fs_info->scrubs_running); |
3914 | wake_up(&fs_info->scrub_pause_wait); | |
3915 | ||
b6bfebc1 | 3916 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
0ef8e451 | 3917 | |
a2de733c | 3918 | if (progress) |
d9d181c1 | 3919 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
a2de733c AJ |
3920 | |
3921 | mutex_lock(&fs_info->scrub_lock); | |
3922 | dev->scrub_device = NULL; | |
3b7a016f | 3923 | scrub_workers_put(fs_info); |
a2de733c AJ |
3924 | mutex_unlock(&fs_info->scrub_lock); |
3925 | ||
f55985f4 | 3926 | scrub_put_ctx(sctx); |
a2de733c AJ |
3927 | |
3928 | return ret; | |
3929 | } | |
3930 | ||
143bede5 | 3931 | void btrfs_scrub_pause(struct btrfs_root *root) |
a2de733c AJ |
3932 | { |
3933 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3934 | ||
3935 | mutex_lock(&fs_info->scrub_lock); | |
3936 | atomic_inc(&fs_info->scrub_pause_req); | |
3937 | while (atomic_read(&fs_info->scrubs_paused) != | |
3938 | atomic_read(&fs_info->scrubs_running)) { | |
3939 | mutex_unlock(&fs_info->scrub_lock); | |
3940 | wait_event(fs_info->scrub_pause_wait, | |
3941 | atomic_read(&fs_info->scrubs_paused) == | |
3942 | atomic_read(&fs_info->scrubs_running)); | |
3943 | mutex_lock(&fs_info->scrub_lock); | |
3944 | } | |
3945 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c AJ |
3946 | } |
3947 | ||
143bede5 | 3948 | void btrfs_scrub_continue(struct btrfs_root *root) |
a2de733c AJ |
3949 | { |
3950 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3951 | ||
3952 | atomic_dec(&fs_info->scrub_pause_req); | |
3953 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
3954 | } |
3955 | ||
aa1b8cd4 | 3956 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
a2de733c | 3957 | { |
a2de733c AJ |
3958 | mutex_lock(&fs_info->scrub_lock); |
3959 | if (!atomic_read(&fs_info->scrubs_running)) { | |
3960 | mutex_unlock(&fs_info->scrub_lock); | |
3961 | return -ENOTCONN; | |
3962 | } | |
3963 | ||
3964 | atomic_inc(&fs_info->scrub_cancel_req); | |
3965 | while (atomic_read(&fs_info->scrubs_running)) { | |
3966 | mutex_unlock(&fs_info->scrub_lock); | |
3967 | wait_event(fs_info->scrub_pause_wait, | |
3968 | atomic_read(&fs_info->scrubs_running) == 0); | |
3969 | mutex_lock(&fs_info->scrub_lock); | |
3970 | } | |
3971 | atomic_dec(&fs_info->scrub_cancel_req); | |
3972 | mutex_unlock(&fs_info->scrub_lock); | |
3973 | ||
3974 | return 0; | |
3975 | } | |
3976 | ||
aa1b8cd4 SB |
3977 | int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info, |
3978 | struct btrfs_device *dev) | |
49b25e05 | 3979 | { |
d9d181c1 | 3980 | struct scrub_ctx *sctx; |
a2de733c AJ |
3981 | |
3982 | mutex_lock(&fs_info->scrub_lock); | |
d9d181c1 SB |
3983 | sctx = dev->scrub_device; |
3984 | if (!sctx) { | |
a2de733c AJ |
3985 | mutex_unlock(&fs_info->scrub_lock); |
3986 | return -ENOTCONN; | |
3987 | } | |
d9d181c1 | 3988 | atomic_inc(&sctx->cancel_req); |
a2de733c AJ |
3989 | while (dev->scrub_device) { |
3990 | mutex_unlock(&fs_info->scrub_lock); | |
3991 | wait_event(fs_info->scrub_pause_wait, | |
3992 | dev->scrub_device == NULL); | |
3993 | mutex_lock(&fs_info->scrub_lock); | |
3994 | } | |
3995 | mutex_unlock(&fs_info->scrub_lock); | |
3996 | ||
3997 | return 0; | |
3998 | } | |
1623edeb | 3999 | |
a2de733c AJ |
4000 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, |
4001 | struct btrfs_scrub_progress *progress) | |
4002 | { | |
4003 | struct btrfs_device *dev; | |
d9d181c1 | 4004 | struct scrub_ctx *sctx = NULL; |
a2de733c AJ |
4005 | |
4006 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
aa1b8cd4 | 4007 | dev = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
a2de733c | 4008 | if (dev) |
d9d181c1 SB |
4009 | sctx = dev->scrub_device; |
4010 | if (sctx) | |
4011 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
a2de733c AJ |
4012 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
4013 | ||
d9d181c1 | 4014 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
a2de733c | 4015 | } |
ff023aac SB |
4016 | |
4017 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
4018 | u64 extent_logical, u64 extent_len, | |
4019 | u64 *extent_physical, | |
4020 | struct btrfs_device **extent_dev, | |
4021 | int *extent_mirror_num) | |
4022 | { | |
4023 | u64 mapped_length; | |
4024 | struct btrfs_bio *bbio = NULL; | |
4025 | int ret; | |
4026 | ||
4027 | mapped_length = extent_len; | |
4028 | ret = btrfs_map_block(fs_info, READ, extent_logical, | |
4029 | &mapped_length, &bbio, 0); | |
4030 | if (ret || !bbio || mapped_length < extent_len || | |
4031 | !bbio->stripes[0].dev->bdev) { | |
6e9606d2 | 4032 | btrfs_put_bbio(bbio); |
ff023aac SB |
4033 | return; |
4034 | } | |
4035 | ||
4036 | *extent_physical = bbio->stripes[0].physical; | |
4037 | *extent_mirror_num = bbio->mirror_num; | |
4038 | *extent_dev = bbio->stripes[0].dev; | |
6e9606d2 | 4039 | btrfs_put_bbio(bbio); |
ff023aac SB |
4040 | } |
4041 | ||
4042 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
4043 | struct scrub_wr_ctx *wr_ctx, | |
4044 | struct btrfs_fs_info *fs_info, | |
4045 | struct btrfs_device *dev, | |
4046 | int is_dev_replace) | |
4047 | { | |
4048 | WARN_ON(wr_ctx->wr_curr_bio != NULL); | |
4049 | ||
4050 | mutex_init(&wr_ctx->wr_lock); | |
4051 | wr_ctx->wr_curr_bio = NULL; | |
4052 | if (!is_dev_replace) | |
4053 | return 0; | |
4054 | ||
4055 | WARN_ON(!dev->bdev); | |
b54ffb73 | 4056 | wr_ctx->pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO; |
ff023aac SB |
4057 | wr_ctx->tgtdev = dev; |
4058 | atomic_set(&wr_ctx->flush_all_writes, 0); | |
4059 | return 0; | |
4060 | } | |
4061 | ||
4062 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx) | |
4063 | { | |
4064 | mutex_lock(&wr_ctx->wr_lock); | |
4065 | kfree(wr_ctx->wr_curr_bio); | |
4066 | wr_ctx->wr_curr_bio = NULL; | |
4067 | mutex_unlock(&wr_ctx->wr_lock); | |
4068 | } | |
4069 | ||
4070 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, | |
4071 | int mirror_num, u64 physical_for_dev_replace) | |
4072 | { | |
4073 | struct scrub_copy_nocow_ctx *nocow_ctx; | |
4074 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
4075 | ||
4076 | nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS); | |
4077 | if (!nocow_ctx) { | |
4078 | spin_lock(&sctx->stat_lock); | |
4079 | sctx->stat.malloc_errors++; | |
4080 | spin_unlock(&sctx->stat_lock); | |
4081 | return -ENOMEM; | |
4082 | } | |
4083 | ||
4084 | scrub_pending_trans_workers_inc(sctx); | |
4085 | ||
4086 | nocow_ctx->sctx = sctx; | |
4087 | nocow_ctx->logical = logical; | |
4088 | nocow_ctx->len = len; | |
4089 | nocow_ctx->mirror_num = mirror_num; | |
4090 | nocow_ctx->physical_for_dev_replace = physical_for_dev_replace; | |
9e0af237 LB |
4091 | btrfs_init_work(&nocow_ctx->work, btrfs_scrubnc_helper, |
4092 | copy_nocow_pages_worker, NULL, NULL); | |
652f25a2 | 4093 | INIT_LIST_HEAD(&nocow_ctx->inodes); |
0339ef2f QW |
4094 | btrfs_queue_work(fs_info->scrub_nocow_workers, |
4095 | &nocow_ctx->work); | |
ff023aac SB |
4096 | |
4097 | return 0; | |
4098 | } | |
4099 | ||
652f25a2 JB |
4100 | static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx) |
4101 | { | |
4102 | struct scrub_copy_nocow_ctx *nocow_ctx = ctx; | |
4103 | struct scrub_nocow_inode *nocow_inode; | |
4104 | ||
4105 | nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS); | |
4106 | if (!nocow_inode) | |
4107 | return -ENOMEM; | |
4108 | nocow_inode->inum = inum; | |
4109 | nocow_inode->offset = offset; | |
4110 | nocow_inode->root = root; | |
4111 | list_add_tail(&nocow_inode->list, &nocow_ctx->inodes); | |
4112 | return 0; | |
4113 | } | |
4114 | ||
4115 | #define COPY_COMPLETE 1 | |
4116 | ||
ff023aac SB |
4117 | static void copy_nocow_pages_worker(struct btrfs_work *work) |
4118 | { | |
4119 | struct scrub_copy_nocow_ctx *nocow_ctx = | |
4120 | container_of(work, struct scrub_copy_nocow_ctx, work); | |
4121 | struct scrub_ctx *sctx = nocow_ctx->sctx; | |
4122 | u64 logical = nocow_ctx->logical; | |
4123 | u64 len = nocow_ctx->len; | |
4124 | int mirror_num = nocow_ctx->mirror_num; | |
4125 | u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; | |
4126 | int ret; | |
4127 | struct btrfs_trans_handle *trans = NULL; | |
4128 | struct btrfs_fs_info *fs_info; | |
4129 | struct btrfs_path *path; | |
4130 | struct btrfs_root *root; | |
4131 | int not_written = 0; | |
4132 | ||
4133 | fs_info = sctx->dev_root->fs_info; | |
4134 | root = fs_info->extent_root; | |
4135 | ||
4136 | path = btrfs_alloc_path(); | |
4137 | if (!path) { | |
4138 | spin_lock(&sctx->stat_lock); | |
4139 | sctx->stat.malloc_errors++; | |
4140 | spin_unlock(&sctx->stat_lock); | |
4141 | not_written = 1; | |
4142 | goto out; | |
4143 | } | |
4144 | ||
4145 | trans = btrfs_join_transaction(root); | |
4146 | if (IS_ERR(trans)) { | |
4147 | not_written = 1; | |
4148 | goto out; | |
4149 | } | |
4150 | ||
4151 | ret = iterate_inodes_from_logical(logical, fs_info, path, | |
652f25a2 | 4152 | record_inode_for_nocow, nocow_ctx); |
ff023aac | 4153 | if (ret != 0 && ret != -ENOENT) { |
efe120a0 FH |
4154 | btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, " |
4155 | "phys %llu, len %llu, mir %u, ret %d", | |
118a0a25 GU |
4156 | logical, physical_for_dev_replace, len, mirror_num, |
4157 | ret); | |
ff023aac SB |
4158 | not_written = 1; |
4159 | goto out; | |
4160 | } | |
4161 | ||
652f25a2 JB |
4162 | btrfs_end_transaction(trans, root); |
4163 | trans = NULL; | |
4164 | while (!list_empty(&nocow_ctx->inodes)) { | |
4165 | struct scrub_nocow_inode *entry; | |
4166 | entry = list_first_entry(&nocow_ctx->inodes, | |
4167 | struct scrub_nocow_inode, | |
4168 | list); | |
4169 | list_del_init(&entry->list); | |
4170 | ret = copy_nocow_pages_for_inode(entry->inum, entry->offset, | |
4171 | entry->root, nocow_ctx); | |
4172 | kfree(entry); | |
4173 | if (ret == COPY_COMPLETE) { | |
4174 | ret = 0; | |
4175 | break; | |
4176 | } else if (ret) { | |
4177 | break; | |
4178 | } | |
4179 | } | |
ff023aac | 4180 | out: |
652f25a2 JB |
4181 | while (!list_empty(&nocow_ctx->inodes)) { |
4182 | struct scrub_nocow_inode *entry; | |
4183 | entry = list_first_entry(&nocow_ctx->inodes, | |
4184 | struct scrub_nocow_inode, | |
4185 | list); | |
4186 | list_del_init(&entry->list); | |
4187 | kfree(entry); | |
4188 | } | |
ff023aac SB |
4189 | if (trans && !IS_ERR(trans)) |
4190 | btrfs_end_transaction(trans, root); | |
4191 | if (not_written) | |
4192 | btrfs_dev_replace_stats_inc(&fs_info->dev_replace. | |
4193 | num_uncorrectable_read_errors); | |
4194 | ||
4195 | btrfs_free_path(path); | |
4196 | kfree(nocow_ctx); | |
4197 | ||
4198 | scrub_pending_trans_workers_dec(sctx); | |
4199 | } | |
4200 | ||
32159242 GH |
4201 | static int check_extent_to_block(struct inode *inode, u64 start, u64 len, |
4202 | u64 logical) | |
4203 | { | |
4204 | struct extent_state *cached_state = NULL; | |
4205 | struct btrfs_ordered_extent *ordered; | |
4206 | struct extent_io_tree *io_tree; | |
4207 | struct extent_map *em; | |
4208 | u64 lockstart = start, lockend = start + len - 1; | |
4209 | int ret = 0; | |
4210 | ||
4211 | io_tree = &BTRFS_I(inode)->io_tree; | |
4212 | ||
4213 | lock_extent_bits(io_tree, lockstart, lockend, 0, &cached_state); | |
4214 | ordered = btrfs_lookup_ordered_range(inode, lockstart, len); | |
4215 | if (ordered) { | |
4216 | btrfs_put_ordered_extent(ordered); | |
4217 | ret = 1; | |
4218 | goto out_unlock; | |
4219 | } | |
4220 | ||
4221 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
4222 | if (IS_ERR(em)) { | |
4223 | ret = PTR_ERR(em); | |
4224 | goto out_unlock; | |
4225 | } | |
4226 | ||
4227 | /* | |
4228 | * This extent does not actually cover the logical extent anymore, | |
4229 | * move on to the next inode. | |
4230 | */ | |
4231 | if (em->block_start > logical || | |
4232 | em->block_start + em->block_len < logical + len) { | |
4233 | free_extent_map(em); | |
4234 | ret = 1; | |
4235 | goto out_unlock; | |
4236 | } | |
4237 | free_extent_map(em); | |
4238 | ||
4239 | out_unlock: | |
4240 | unlock_extent_cached(io_tree, lockstart, lockend, &cached_state, | |
4241 | GFP_NOFS); | |
4242 | return ret; | |
4243 | } | |
4244 | ||
652f25a2 JB |
4245 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, |
4246 | struct scrub_copy_nocow_ctx *nocow_ctx) | |
ff023aac | 4247 | { |
826aa0a8 | 4248 | struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info; |
ff023aac | 4249 | struct btrfs_key key; |
826aa0a8 MX |
4250 | struct inode *inode; |
4251 | struct page *page; | |
ff023aac | 4252 | struct btrfs_root *local_root; |
652f25a2 | 4253 | struct extent_io_tree *io_tree; |
ff023aac | 4254 | u64 physical_for_dev_replace; |
32159242 | 4255 | u64 nocow_ctx_logical; |
652f25a2 | 4256 | u64 len = nocow_ctx->len; |
826aa0a8 | 4257 | unsigned long index; |
6f1c3605 | 4258 | int srcu_index; |
652f25a2 JB |
4259 | int ret = 0; |
4260 | int err = 0; | |
ff023aac SB |
4261 | |
4262 | key.objectid = root; | |
4263 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4264 | key.offset = (u64)-1; | |
6f1c3605 LB |
4265 | |
4266 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
4267 | ||
ff023aac | 4268 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); |
6f1c3605 LB |
4269 | if (IS_ERR(local_root)) { |
4270 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
ff023aac | 4271 | return PTR_ERR(local_root); |
6f1c3605 | 4272 | } |
ff023aac SB |
4273 | |
4274 | key.type = BTRFS_INODE_ITEM_KEY; | |
4275 | key.objectid = inum; | |
4276 | key.offset = 0; | |
4277 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); | |
6f1c3605 | 4278 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
ff023aac SB |
4279 | if (IS_ERR(inode)) |
4280 | return PTR_ERR(inode); | |
4281 | ||
edd1400b MX |
4282 | /* Avoid truncate/dio/punch hole.. */ |
4283 | mutex_lock(&inode->i_mutex); | |
4284 | inode_dio_wait(inode); | |
4285 | ||
ff023aac | 4286 | physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; |
652f25a2 | 4287 | io_tree = &BTRFS_I(inode)->io_tree; |
32159242 | 4288 | nocow_ctx_logical = nocow_ctx->logical; |
652f25a2 | 4289 | |
32159242 GH |
4290 | ret = check_extent_to_block(inode, offset, len, nocow_ctx_logical); |
4291 | if (ret) { | |
4292 | ret = ret > 0 ? 0 : ret; | |
4293 | goto out; | |
652f25a2 | 4294 | } |
652f25a2 | 4295 | |
ff023aac | 4296 | while (len >= PAGE_CACHE_SIZE) { |
ff023aac | 4297 | index = offset >> PAGE_CACHE_SHIFT; |
edd1400b | 4298 | again: |
ff023aac SB |
4299 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
4300 | if (!page) { | |
efe120a0 | 4301 | btrfs_err(fs_info, "find_or_create_page() failed"); |
ff023aac | 4302 | ret = -ENOMEM; |
826aa0a8 | 4303 | goto out; |
ff023aac SB |
4304 | } |
4305 | ||
4306 | if (PageUptodate(page)) { | |
4307 | if (PageDirty(page)) | |
4308 | goto next_page; | |
4309 | } else { | |
4310 | ClearPageError(page); | |
32159242 | 4311 | err = extent_read_full_page(io_tree, page, |
652f25a2 JB |
4312 | btrfs_get_extent, |
4313 | nocow_ctx->mirror_num); | |
826aa0a8 MX |
4314 | if (err) { |
4315 | ret = err; | |
ff023aac SB |
4316 | goto next_page; |
4317 | } | |
edd1400b | 4318 | |
26b25891 | 4319 | lock_page(page); |
edd1400b MX |
4320 | /* |
4321 | * If the page has been remove from the page cache, | |
4322 | * the data on it is meaningless, because it may be | |
4323 | * old one, the new data may be written into the new | |
4324 | * page in the page cache. | |
4325 | */ | |
4326 | if (page->mapping != inode->i_mapping) { | |
652f25a2 | 4327 | unlock_page(page); |
edd1400b MX |
4328 | page_cache_release(page); |
4329 | goto again; | |
4330 | } | |
ff023aac SB |
4331 | if (!PageUptodate(page)) { |
4332 | ret = -EIO; | |
4333 | goto next_page; | |
4334 | } | |
4335 | } | |
32159242 GH |
4336 | |
4337 | ret = check_extent_to_block(inode, offset, len, | |
4338 | nocow_ctx_logical); | |
4339 | if (ret) { | |
4340 | ret = ret > 0 ? 0 : ret; | |
4341 | goto next_page; | |
4342 | } | |
4343 | ||
826aa0a8 MX |
4344 | err = write_page_nocow(nocow_ctx->sctx, |
4345 | physical_for_dev_replace, page); | |
4346 | if (err) | |
4347 | ret = err; | |
ff023aac | 4348 | next_page: |
826aa0a8 MX |
4349 | unlock_page(page); |
4350 | page_cache_release(page); | |
4351 | ||
4352 | if (ret) | |
4353 | break; | |
4354 | ||
ff023aac SB |
4355 | offset += PAGE_CACHE_SIZE; |
4356 | physical_for_dev_replace += PAGE_CACHE_SIZE; | |
32159242 | 4357 | nocow_ctx_logical += PAGE_CACHE_SIZE; |
ff023aac SB |
4358 | len -= PAGE_CACHE_SIZE; |
4359 | } | |
652f25a2 | 4360 | ret = COPY_COMPLETE; |
826aa0a8 | 4361 | out: |
edd1400b | 4362 | mutex_unlock(&inode->i_mutex); |
826aa0a8 | 4363 | iput(inode); |
ff023aac SB |
4364 | return ret; |
4365 | } | |
4366 | ||
4367 | static int write_page_nocow(struct scrub_ctx *sctx, | |
4368 | u64 physical_for_dev_replace, struct page *page) | |
4369 | { | |
4370 | struct bio *bio; | |
4371 | struct btrfs_device *dev; | |
4372 | int ret; | |
ff023aac SB |
4373 | |
4374 | dev = sctx->wr_ctx.tgtdev; | |
4375 | if (!dev) | |
4376 | return -EIO; | |
4377 | if (!dev->bdev) { | |
4378 | printk_ratelimited(KERN_WARNING | |
efe120a0 | 4379 | "BTRFS: scrub write_page_nocow(bdev == NULL) is unexpected!\n"); |
ff023aac SB |
4380 | return -EIO; |
4381 | } | |
9be3395b | 4382 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
ff023aac SB |
4383 | if (!bio) { |
4384 | spin_lock(&sctx->stat_lock); | |
4385 | sctx->stat.malloc_errors++; | |
4386 | spin_unlock(&sctx->stat_lock); | |
4387 | return -ENOMEM; | |
4388 | } | |
4f024f37 KO |
4389 | bio->bi_iter.bi_size = 0; |
4390 | bio->bi_iter.bi_sector = physical_for_dev_replace >> 9; | |
ff023aac SB |
4391 | bio->bi_bdev = dev->bdev; |
4392 | ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); | |
4393 | if (ret != PAGE_CACHE_SIZE) { | |
4394 | leave_with_eio: | |
4395 | bio_put(bio); | |
4396 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); | |
4397 | return -EIO; | |
4398 | } | |
ff023aac | 4399 | |
33879d45 | 4400 | if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) |
ff023aac SB |
4401 | goto leave_with_eio; |
4402 | ||
4403 | bio_put(bio); | |
4404 | return 0; | |
4405 | } |