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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 | 250 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
affe4a5a ZL |
251 | struct scrub_block *sblock, |
252 | int retry_failed_mirror); | |
ba7cf988 | 253 | static void scrub_recheck_block_checksum(struct scrub_block *sblock); |
b5d67f64 | 254 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
114ab50d | 255 | struct scrub_block *sblock_good); |
b5d67f64 SB |
256 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, |
257 | struct scrub_block *sblock_good, | |
258 | int page_num, int force_write); | |
ff023aac SB |
259 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock); |
260 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
261 | int page_num); | |
b5d67f64 SB |
262 | static int scrub_checksum_data(struct scrub_block *sblock); |
263 | static int scrub_checksum_tree_block(struct scrub_block *sblock); | |
264 | static int scrub_checksum_super(struct scrub_block *sblock); | |
265 | static void scrub_block_get(struct scrub_block *sblock); | |
266 | static void scrub_block_put(struct scrub_block *sblock); | |
7a9e9987 SB |
267 | static void scrub_page_get(struct scrub_page *spage); |
268 | static void scrub_page_put(struct scrub_page *spage); | |
5a6ac9ea MX |
269 | static void scrub_parity_get(struct scrub_parity *sparity); |
270 | static void scrub_parity_put(struct scrub_parity *sparity); | |
ff023aac SB |
271 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
272 | struct scrub_page *spage); | |
d9d181c1 | 273 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 274 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
275 | u64 gen, int mirror_num, u8 *csum, int force, |
276 | u64 physical_for_dev_replace); | |
4246a0b6 | 277 | static void scrub_bio_end_io(struct bio *bio); |
b5d67f64 SB |
278 | static void scrub_bio_end_io_worker(struct btrfs_work *work); |
279 | static void scrub_block_complete(struct scrub_block *sblock); | |
ff023aac SB |
280 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, |
281 | u64 extent_logical, u64 extent_len, | |
282 | u64 *extent_physical, | |
283 | struct btrfs_device **extent_dev, | |
284 | int *extent_mirror_num); | |
285 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
286 | struct scrub_wr_ctx *wr_ctx, | |
287 | struct btrfs_fs_info *fs_info, | |
288 | struct btrfs_device *dev, | |
289 | int is_dev_replace); | |
290 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx); | |
291 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
292 | struct scrub_page *spage); | |
293 | static void scrub_wr_submit(struct scrub_ctx *sctx); | |
4246a0b6 | 294 | static void scrub_wr_bio_end_io(struct bio *bio); |
ff023aac SB |
295 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work); |
296 | static int write_page_nocow(struct scrub_ctx *sctx, | |
297 | u64 physical_for_dev_replace, struct page *page); | |
298 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, | |
652f25a2 | 299 | struct scrub_copy_nocow_ctx *ctx); |
ff023aac SB |
300 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
301 | int mirror_num, u64 physical_for_dev_replace); | |
302 | static void copy_nocow_pages_worker(struct btrfs_work *work); | |
cb7ab021 | 303 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
3cb0929a | 304 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
f55985f4 | 305 | static void scrub_put_ctx(struct scrub_ctx *sctx); |
1623edeb SB |
306 | |
307 | ||
b6bfebc1 SB |
308 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx) |
309 | { | |
f55985f4 | 310 | atomic_inc(&sctx->refs); |
b6bfebc1 SB |
311 | atomic_inc(&sctx->bios_in_flight); |
312 | } | |
313 | ||
314 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx) | |
315 | { | |
316 | atomic_dec(&sctx->bios_in_flight); | |
317 | wake_up(&sctx->list_wait); | |
f55985f4 | 318 | scrub_put_ctx(sctx); |
b6bfebc1 SB |
319 | } |
320 | ||
cb7ab021 | 321 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
3cb0929a WS |
322 | { |
323 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
324 | mutex_unlock(&fs_info->scrub_lock); | |
325 | wait_event(fs_info->scrub_pause_wait, | |
326 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
327 | mutex_lock(&fs_info->scrub_lock); | |
328 | } | |
329 | } | |
330 | ||
0e22be89 | 331 | static void scrub_pause_on(struct btrfs_fs_info *fs_info) |
cb7ab021 WS |
332 | { |
333 | atomic_inc(&fs_info->scrubs_paused); | |
334 | wake_up(&fs_info->scrub_pause_wait); | |
0e22be89 | 335 | } |
cb7ab021 | 336 | |
0e22be89 Z |
337 | static void scrub_pause_off(struct btrfs_fs_info *fs_info) |
338 | { | |
cb7ab021 WS |
339 | mutex_lock(&fs_info->scrub_lock); |
340 | __scrub_blocked_if_needed(fs_info); | |
341 | atomic_dec(&fs_info->scrubs_paused); | |
342 | mutex_unlock(&fs_info->scrub_lock); | |
343 | ||
344 | wake_up(&fs_info->scrub_pause_wait); | |
345 | } | |
346 | ||
0e22be89 Z |
347 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
348 | { | |
349 | scrub_pause_on(fs_info); | |
350 | scrub_pause_off(fs_info); | |
351 | } | |
352 | ||
b6bfebc1 SB |
353 | /* |
354 | * used for workers that require transaction commits (i.e., for the | |
355 | * NOCOW case) | |
356 | */ | |
357 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx) | |
358 | { | |
359 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
360 | ||
f55985f4 | 361 | atomic_inc(&sctx->refs); |
b6bfebc1 SB |
362 | /* |
363 | * increment scrubs_running to prevent cancel requests from | |
364 | * completing as long as a worker is running. we must also | |
365 | * increment scrubs_paused to prevent deadlocking on pause | |
366 | * requests used for transactions commits (as the worker uses a | |
367 | * transaction context). it is safe to regard the worker | |
368 | * as paused for all matters practical. effectively, we only | |
369 | * avoid cancellation requests from completing. | |
370 | */ | |
371 | mutex_lock(&fs_info->scrub_lock); | |
372 | atomic_inc(&fs_info->scrubs_running); | |
373 | atomic_inc(&fs_info->scrubs_paused); | |
374 | mutex_unlock(&fs_info->scrub_lock); | |
32a44789 WS |
375 | |
376 | /* | |
377 | * check if @scrubs_running=@scrubs_paused condition | |
378 | * inside wait_event() is not an atomic operation. | |
379 | * which means we may inc/dec @scrub_running/paused | |
380 | * at any time. Let's wake up @scrub_pause_wait as | |
381 | * much as we can to let commit transaction blocked less. | |
382 | */ | |
383 | wake_up(&fs_info->scrub_pause_wait); | |
384 | ||
b6bfebc1 SB |
385 | atomic_inc(&sctx->workers_pending); |
386 | } | |
387 | ||
388 | /* used for workers that require transaction commits */ | |
389 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx) | |
390 | { | |
391 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
392 | ||
393 | /* | |
394 | * see scrub_pending_trans_workers_inc() why we're pretending | |
395 | * to be paused in the scrub counters | |
396 | */ | |
397 | mutex_lock(&fs_info->scrub_lock); | |
398 | atomic_dec(&fs_info->scrubs_running); | |
399 | atomic_dec(&fs_info->scrubs_paused); | |
400 | mutex_unlock(&fs_info->scrub_lock); | |
401 | atomic_dec(&sctx->workers_pending); | |
402 | wake_up(&fs_info->scrub_pause_wait); | |
403 | wake_up(&sctx->list_wait); | |
f55985f4 | 404 | scrub_put_ctx(sctx); |
b6bfebc1 SB |
405 | } |
406 | ||
d9d181c1 | 407 | static void scrub_free_csums(struct scrub_ctx *sctx) |
a2de733c | 408 | { |
d9d181c1 | 409 | while (!list_empty(&sctx->csum_list)) { |
a2de733c | 410 | struct btrfs_ordered_sum *sum; |
d9d181c1 | 411 | sum = list_first_entry(&sctx->csum_list, |
a2de733c AJ |
412 | struct btrfs_ordered_sum, list); |
413 | list_del(&sum->list); | |
414 | kfree(sum); | |
415 | } | |
416 | } | |
417 | ||
d9d181c1 | 418 | static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) |
a2de733c AJ |
419 | { |
420 | int i; | |
a2de733c | 421 | |
d9d181c1 | 422 | if (!sctx) |
a2de733c AJ |
423 | return; |
424 | ||
ff023aac SB |
425 | scrub_free_wr_ctx(&sctx->wr_ctx); |
426 | ||
b5d67f64 | 427 | /* this can happen when scrub is cancelled */ |
d9d181c1 SB |
428 | if (sctx->curr != -1) { |
429 | struct scrub_bio *sbio = sctx->bios[sctx->curr]; | |
b5d67f64 SB |
430 | |
431 | for (i = 0; i < sbio->page_count; i++) { | |
ff023aac | 432 | WARN_ON(!sbio->pagev[i]->page); |
b5d67f64 SB |
433 | scrub_block_put(sbio->pagev[i]->sblock); |
434 | } | |
435 | bio_put(sbio->bio); | |
436 | } | |
437 | ||
ff023aac | 438 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
d9d181c1 | 439 | struct scrub_bio *sbio = sctx->bios[i]; |
a2de733c AJ |
440 | |
441 | if (!sbio) | |
442 | break; | |
a2de733c AJ |
443 | kfree(sbio); |
444 | } | |
445 | ||
d9d181c1 SB |
446 | scrub_free_csums(sctx); |
447 | kfree(sctx); | |
a2de733c AJ |
448 | } |
449 | ||
f55985f4 FM |
450 | static void scrub_put_ctx(struct scrub_ctx *sctx) |
451 | { | |
452 | if (atomic_dec_and_test(&sctx->refs)) | |
453 | scrub_free_ctx(sctx); | |
454 | } | |
455 | ||
a2de733c | 456 | static noinline_for_stack |
63a212ab | 457 | struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace) |
a2de733c | 458 | { |
d9d181c1 | 459 | struct scrub_ctx *sctx; |
a2de733c | 460 | int i; |
a2de733c | 461 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
ff023aac | 462 | int ret; |
a2de733c | 463 | |
d9d181c1 SB |
464 | sctx = kzalloc(sizeof(*sctx), GFP_NOFS); |
465 | if (!sctx) | |
a2de733c | 466 | goto nomem; |
f55985f4 | 467 | atomic_set(&sctx->refs, 1); |
63a212ab | 468 | sctx->is_dev_replace = is_dev_replace; |
b54ffb73 | 469 | sctx->pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; |
d9d181c1 | 470 | sctx->curr = -1; |
a36cf8b8 | 471 | sctx->dev_root = dev->dev_root; |
ff023aac | 472 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
a2de733c AJ |
473 | struct scrub_bio *sbio; |
474 | ||
475 | sbio = kzalloc(sizeof(*sbio), GFP_NOFS); | |
476 | if (!sbio) | |
477 | goto nomem; | |
d9d181c1 | 478 | sctx->bios[i] = sbio; |
a2de733c | 479 | |
a2de733c | 480 | sbio->index = i; |
d9d181c1 | 481 | sbio->sctx = sctx; |
b5d67f64 | 482 | sbio->page_count = 0; |
9e0af237 LB |
483 | btrfs_init_work(&sbio->work, btrfs_scrub_helper, |
484 | scrub_bio_end_io_worker, NULL, NULL); | |
a2de733c | 485 | |
ff023aac | 486 | if (i != SCRUB_BIOS_PER_SCTX - 1) |
d9d181c1 | 487 | sctx->bios[i]->next_free = i + 1; |
0ef8e451 | 488 | else |
d9d181c1 SB |
489 | sctx->bios[i]->next_free = -1; |
490 | } | |
491 | sctx->first_free = 0; | |
492 | sctx->nodesize = dev->dev_root->nodesize; | |
d9d181c1 | 493 | sctx->sectorsize = dev->dev_root->sectorsize; |
b6bfebc1 SB |
494 | atomic_set(&sctx->bios_in_flight, 0); |
495 | atomic_set(&sctx->workers_pending, 0); | |
d9d181c1 SB |
496 | atomic_set(&sctx->cancel_req, 0); |
497 | sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
498 | INIT_LIST_HEAD(&sctx->csum_list); | |
499 | ||
500 | spin_lock_init(&sctx->list_lock); | |
501 | spin_lock_init(&sctx->stat_lock); | |
502 | init_waitqueue_head(&sctx->list_wait); | |
ff023aac SB |
503 | |
504 | ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info, | |
505 | fs_info->dev_replace.tgtdev, is_dev_replace); | |
506 | if (ret) { | |
507 | scrub_free_ctx(sctx); | |
508 | return ERR_PTR(ret); | |
509 | } | |
d9d181c1 | 510 | return sctx; |
a2de733c AJ |
511 | |
512 | nomem: | |
d9d181c1 | 513 | scrub_free_ctx(sctx); |
a2de733c AJ |
514 | return ERR_PTR(-ENOMEM); |
515 | } | |
516 | ||
ff023aac SB |
517 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, |
518 | void *warn_ctx) | |
558540c1 JS |
519 | { |
520 | u64 isize; | |
521 | u32 nlink; | |
522 | int ret; | |
523 | int i; | |
524 | struct extent_buffer *eb; | |
525 | struct btrfs_inode_item *inode_item; | |
ff023aac | 526 | struct scrub_warning *swarn = warn_ctx; |
558540c1 JS |
527 | struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; |
528 | struct inode_fs_paths *ipath = NULL; | |
529 | struct btrfs_root *local_root; | |
530 | struct btrfs_key root_key; | |
1d4c08e0 | 531 | struct btrfs_key key; |
558540c1 JS |
532 | |
533 | root_key.objectid = root; | |
534 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
535 | root_key.offset = (u64)-1; | |
536 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
537 | if (IS_ERR(local_root)) { | |
538 | ret = PTR_ERR(local_root); | |
539 | goto err; | |
540 | } | |
541 | ||
14692cc1 DS |
542 | /* |
543 | * this makes the path point to (inum INODE_ITEM ioff) | |
544 | */ | |
1d4c08e0 DS |
545 | key.objectid = inum; |
546 | key.type = BTRFS_INODE_ITEM_KEY; | |
547 | key.offset = 0; | |
548 | ||
549 | ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0); | |
558540c1 JS |
550 | if (ret) { |
551 | btrfs_release_path(swarn->path); | |
552 | goto err; | |
553 | } | |
554 | ||
555 | eb = swarn->path->nodes[0]; | |
556 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], | |
557 | struct btrfs_inode_item); | |
558 | isize = btrfs_inode_size(eb, inode_item); | |
559 | nlink = btrfs_inode_nlink(eb, inode_item); | |
560 | btrfs_release_path(swarn->path); | |
561 | ||
562 | ipath = init_ipath(4096, local_root, swarn->path); | |
26bdef54 DC |
563 | if (IS_ERR(ipath)) { |
564 | ret = PTR_ERR(ipath); | |
565 | ipath = NULL; | |
566 | goto err; | |
567 | } | |
558540c1 JS |
568 | ret = paths_from_inode(inum, ipath); |
569 | ||
570 | if (ret < 0) | |
571 | goto err; | |
572 | ||
573 | /* | |
574 | * we deliberately ignore the bit ipath might have been too small to | |
575 | * hold all of the paths here | |
576 | */ | |
577 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) | |
ecaeb14b | 578 | btrfs_warn_in_rcu(fs_info, "%s at logical %llu on dev " |
558540c1 | 579 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " |
ecaeb14b | 580 | "length %llu, links %u (path: %s)", swarn->errstr, |
606686ee | 581 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
582 | (unsigned long long)swarn->sector, root, inum, offset, |
583 | min(isize - offset, (u64)PAGE_SIZE), nlink, | |
745c4d8e | 584 | (char *)(unsigned long)ipath->fspath->val[i]); |
558540c1 JS |
585 | |
586 | free_ipath(ipath); | |
587 | return 0; | |
588 | ||
589 | err: | |
ecaeb14b | 590 | btrfs_warn_in_rcu(fs_info, "%s at logical %llu on dev " |
558540c1 | 591 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " |
ecaeb14b | 592 | "resolving failed with ret=%d", swarn->errstr, |
606686ee | 593 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
594 | (unsigned long long)swarn->sector, root, inum, offset, ret); |
595 | ||
596 | free_ipath(ipath); | |
597 | return 0; | |
598 | } | |
599 | ||
b5d67f64 | 600 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
558540c1 | 601 | { |
a36cf8b8 SB |
602 | struct btrfs_device *dev; |
603 | struct btrfs_fs_info *fs_info; | |
558540c1 JS |
604 | struct btrfs_path *path; |
605 | struct btrfs_key found_key; | |
606 | struct extent_buffer *eb; | |
607 | struct btrfs_extent_item *ei; | |
608 | struct scrub_warning swarn; | |
69917e43 LB |
609 | unsigned long ptr = 0; |
610 | u64 extent_item_pos; | |
611 | u64 flags = 0; | |
558540c1 | 612 | u64 ref_root; |
69917e43 | 613 | u32 item_size; |
558540c1 | 614 | u8 ref_level; |
69917e43 | 615 | int ret; |
558540c1 | 616 | |
a36cf8b8 | 617 | WARN_ON(sblock->page_count < 1); |
7a9e9987 | 618 | dev = sblock->pagev[0]->dev; |
a36cf8b8 SB |
619 | fs_info = sblock->sctx->dev_root->fs_info; |
620 | ||
558540c1 | 621 | path = btrfs_alloc_path(); |
8b9456da DS |
622 | if (!path) |
623 | return; | |
558540c1 | 624 | |
7a9e9987 SB |
625 | swarn.sector = (sblock->pagev[0]->physical) >> 9; |
626 | swarn.logical = sblock->pagev[0]->logical; | |
558540c1 | 627 | swarn.errstr = errstr; |
a36cf8b8 | 628 | swarn.dev = NULL; |
558540c1 | 629 | |
69917e43 LB |
630 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, |
631 | &flags); | |
558540c1 JS |
632 | if (ret < 0) |
633 | goto out; | |
634 | ||
4692cf58 | 635 | extent_item_pos = swarn.logical - found_key.objectid; |
558540c1 JS |
636 | swarn.extent_item_size = found_key.offset; |
637 | ||
638 | eb = path->nodes[0]; | |
639 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); | |
640 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
641 | ||
69917e43 | 642 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
558540c1 | 643 | do { |
6eda71d0 LB |
644 | ret = tree_backref_for_extent(&ptr, eb, &found_key, ei, |
645 | item_size, &ref_root, | |
646 | &ref_level); | |
ecaeb14b DS |
647 | btrfs_warn_in_rcu(fs_info, |
648 | "%s at logical %llu on dev %s, " | |
558540c1 | 649 | "sector %llu: metadata %s (level %d) in tree " |
ecaeb14b | 650 | "%llu", errstr, swarn.logical, |
606686ee | 651 | rcu_str_deref(dev->name), |
558540c1 JS |
652 | (unsigned long long)swarn.sector, |
653 | ref_level ? "node" : "leaf", | |
654 | ret < 0 ? -1 : ref_level, | |
655 | ret < 0 ? -1 : ref_root); | |
656 | } while (ret != 1); | |
d8fe29e9 | 657 | btrfs_release_path(path); |
558540c1 | 658 | } else { |
d8fe29e9 | 659 | btrfs_release_path(path); |
558540c1 | 660 | swarn.path = path; |
a36cf8b8 | 661 | swarn.dev = dev; |
7a3ae2f8 JS |
662 | iterate_extent_inodes(fs_info, found_key.objectid, |
663 | extent_item_pos, 1, | |
558540c1 JS |
664 | scrub_print_warning_inode, &swarn); |
665 | } | |
666 | ||
667 | out: | |
668 | btrfs_free_path(path); | |
558540c1 JS |
669 | } |
670 | ||
ff023aac | 671 | static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx) |
0ef8e451 | 672 | { |
5da6fcbc | 673 | struct page *page = NULL; |
0ef8e451 | 674 | unsigned long index; |
ff023aac | 675 | struct scrub_fixup_nodatasum *fixup = fixup_ctx; |
0ef8e451 | 676 | int ret; |
5da6fcbc | 677 | int corrected = 0; |
0ef8e451 | 678 | struct btrfs_key key; |
5da6fcbc | 679 | struct inode *inode = NULL; |
6f1c3605 | 680 | struct btrfs_fs_info *fs_info; |
0ef8e451 JS |
681 | u64 end = offset + PAGE_SIZE - 1; |
682 | struct btrfs_root *local_root; | |
6f1c3605 | 683 | int srcu_index; |
0ef8e451 JS |
684 | |
685 | key.objectid = root; | |
686 | key.type = BTRFS_ROOT_ITEM_KEY; | |
687 | key.offset = (u64)-1; | |
6f1c3605 LB |
688 | |
689 | fs_info = fixup->root->fs_info; | |
690 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
691 | ||
692 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
693 | if (IS_ERR(local_root)) { | |
694 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 | 695 | return PTR_ERR(local_root); |
6f1c3605 | 696 | } |
0ef8e451 JS |
697 | |
698 | key.type = BTRFS_INODE_ITEM_KEY; | |
699 | key.objectid = inum; | |
700 | key.offset = 0; | |
6f1c3605 LB |
701 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); |
702 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 JS |
703 | if (IS_ERR(inode)) |
704 | return PTR_ERR(inode); | |
705 | ||
0ef8e451 JS |
706 | index = offset >> PAGE_CACHE_SHIFT; |
707 | ||
708 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
5da6fcbc JS |
709 | if (!page) { |
710 | ret = -ENOMEM; | |
711 | goto out; | |
712 | } | |
713 | ||
714 | if (PageUptodate(page)) { | |
5da6fcbc JS |
715 | if (PageDirty(page)) { |
716 | /* | |
717 | * we need to write the data to the defect sector. the | |
718 | * data that was in that sector is not in memory, | |
719 | * because the page was modified. we must not write the | |
720 | * modified page to that sector. | |
721 | * | |
722 | * TODO: what could be done here: wait for the delalloc | |
723 | * runner to write out that page (might involve | |
724 | * COW) and see whether the sector is still | |
725 | * referenced afterwards. | |
726 | * | |
727 | * For the meantime, we'll treat this error | |
728 | * incorrectable, although there is a chance that a | |
729 | * later scrub will find the bad sector again and that | |
730 | * there's no dirty page in memory, then. | |
731 | */ | |
732 | ret = -EIO; | |
733 | goto out; | |
734 | } | |
1203b681 | 735 | ret = repair_io_failure(inode, offset, PAGE_SIZE, |
5da6fcbc | 736 | fixup->logical, page, |
ffdd2018 | 737 | offset - page_offset(page), |
5da6fcbc JS |
738 | fixup->mirror_num); |
739 | unlock_page(page); | |
740 | corrected = !ret; | |
741 | } else { | |
742 | /* | |
743 | * we need to get good data first. the general readpage path | |
744 | * will call repair_io_failure for us, we just have to make | |
745 | * sure we read the bad mirror. | |
746 | */ | |
747 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
748 | EXTENT_DAMAGED, GFP_NOFS); | |
749 | if (ret) { | |
750 | /* set_extent_bits should give proper error */ | |
751 | WARN_ON(ret > 0); | |
752 | if (ret > 0) | |
753 | ret = -EFAULT; | |
754 | goto out; | |
755 | } | |
756 | ||
757 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, | |
758 | btrfs_get_extent, | |
759 | fixup->mirror_num); | |
760 | wait_on_page_locked(page); | |
761 | ||
762 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, | |
763 | end, EXTENT_DAMAGED, 0, NULL); | |
764 | if (!corrected) | |
765 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
766 | EXTENT_DAMAGED, GFP_NOFS); | |
767 | } | |
768 | ||
769 | out: | |
770 | if (page) | |
771 | put_page(page); | |
7fb18a06 TK |
772 | |
773 | iput(inode); | |
0ef8e451 JS |
774 | |
775 | if (ret < 0) | |
776 | return ret; | |
777 | ||
778 | if (ret == 0 && corrected) { | |
779 | /* | |
780 | * we only need to call readpage for one of the inodes belonging | |
781 | * to this extent. so make iterate_extent_inodes stop | |
782 | */ | |
783 | return 1; | |
784 | } | |
785 | ||
786 | return -EIO; | |
787 | } | |
788 | ||
789 | static void scrub_fixup_nodatasum(struct btrfs_work *work) | |
790 | { | |
791 | int ret; | |
792 | struct scrub_fixup_nodatasum *fixup; | |
d9d181c1 | 793 | struct scrub_ctx *sctx; |
0ef8e451 | 794 | struct btrfs_trans_handle *trans = NULL; |
0ef8e451 JS |
795 | struct btrfs_path *path; |
796 | int uncorrectable = 0; | |
797 | ||
798 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); | |
d9d181c1 | 799 | sctx = fixup->sctx; |
0ef8e451 JS |
800 | |
801 | path = btrfs_alloc_path(); | |
802 | if (!path) { | |
d9d181c1 SB |
803 | spin_lock(&sctx->stat_lock); |
804 | ++sctx->stat.malloc_errors; | |
805 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
806 | uncorrectable = 1; |
807 | goto out; | |
808 | } | |
809 | ||
810 | trans = btrfs_join_transaction(fixup->root); | |
811 | if (IS_ERR(trans)) { | |
812 | uncorrectable = 1; | |
813 | goto out; | |
814 | } | |
815 | ||
816 | /* | |
817 | * the idea is to trigger a regular read through the standard path. we | |
818 | * read a page from the (failed) logical address by specifying the | |
819 | * corresponding copynum of the failed sector. thus, that readpage is | |
820 | * expected to fail. | |
821 | * that is the point where on-the-fly error correction will kick in | |
822 | * (once it's finished) and rewrite the failed sector if a good copy | |
823 | * can be found. | |
824 | */ | |
825 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, | |
826 | path, scrub_fixup_readpage, | |
827 | fixup); | |
828 | if (ret < 0) { | |
829 | uncorrectable = 1; | |
830 | goto out; | |
831 | } | |
832 | WARN_ON(ret != 1); | |
833 | ||
d9d181c1 SB |
834 | spin_lock(&sctx->stat_lock); |
835 | ++sctx->stat.corrected_errors; | |
836 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
837 | |
838 | out: | |
839 | if (trans && !IS_ERR(trans)) | |
840 | btrfs_end_transaction(trans, fixup->root); | |
841 | if (uncorrectable) { | |
d9d181c1 SB |
842 | spin_lock(&sctx->stat_lock); |
843 | ++sctx->stat.uncorrectable_errors; | |
844 | spin_unlock(&sctx->stat_lock); | |
ff023aac SB |
845 | btrfs_dev_replace_stats_inc( |
846 | &sctx->dev_root->fs_info->dev_replace. | |
847 | num_uncorrectable_read_errors); | |
b14af3b4 DS |
848 | btrfs_err_rl_in_rcu(sctx->dev_root->fs_info, |
849 | "unable to fixup (nodatasum) error at logical %llu on dev %s", | |
c1c9ff7c | 850 | fixup->logical, rcu_str_deref(fixup->dev->name)); |
0ef8e451 JS |
851 | } |
852 | ||
853 | btrfs_free_path(path); | |
854 | kfree(fixup); | |
855 | ||
b6bfebc1 | 856 | scrub_pending_trans_workers_dec(sctx); |
0ef8e451 JS |
857 | } |
858 | ||
af8e2d1d MX |
859 | static inline void scrub_get_recover(struct scrub_recover *recover) |
860 | { | |
861 | atomic_inc(&recover->refs); | |
862 | } | |
863 | ||
864 | static inline void scrub_put_recover(struct scrub_recover *recover) | |
865 | { | |
866 | if (atomic_dec_and_test(&recover->refs)) { | |
6e9606d2 | 867 | btrfs_put_bbio(recover->bbio); |
af8e2d1d MX |
868 | kfree(recover); |
869 | } | |
870 | } | |
871 | ||
a2de733c | 872 | /* |
b5d67f64 SB |
873 | * scrub_handle_errored_block gets called when either verification of the |
874 | * pages failed or the bio failed to read, e.g. with EIO. In the latter | |
875 | * case, this function handles all pages in the bio, even though only one | |
876 | * may be bad. | |
877 | * The goal of this function is to repair the errored block by using the | |
878 | * contents of one of the mirrors. | |
a2de733c | 879 | */ |
b5d67f64 | 880 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
a2de733c | 881 | { |
d9d181c1 | 882 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
a36cf8b8 | 883 | struct btrfs_device *dev; |
b5d67f64 SB |
884 | struct btrfs_fs_info *fs_info; |
885 | u64 length; | |
886 | u64 logical; | |
b5d67f64 SB |
887 | unsigned int failed_mirror_index; |
888 | unsigned int is_metadata; | |
889 | unsigned int have_csum; | |
b5d67f64 SB |
890 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ |
891 | struct scrub_block *sblock_bad; | |
892 | int ret; | |
893 | int mirror_index; | |
894 | int page_num; | |
895 | int success; | |
558540c1 | 896 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
b5d67f64 SB |
897 | DEFAULT_RATELIMIT_BURST); |
898 | ||
899 | BUG_ON(sblock_to_check->page_count < 1); | |
a36cf8b8 | 900 | fs_info = sctx->dev_root->fs_info; |
4ded4f63 SB |
901 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
902 | /* | |
903 | * if we find an error in a super block, we just report it. | |
904 | * They will get written with the next transaction commit | |
905 | * anyway | |
906 | */ | |
907 | spin_lock(&sctx->stat_lock); | |
908 | ++sctx->stat.super_errors; | |
909 | spin_unlock(&sctx->stat_lock); | |
910 | return 0; | |
911 | } | |
b5d67f64 | 912 | length = sblock_to_check->page_count * PAGE_SIZE; |
7a9e9987 | 913 | logical = sblock_to_check->pagev[0]->logical; |
7a9e9987 SB |
914 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); |
915 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; | |
916 | is_metadata = !(sblock_to_check->pagev[0]->flags & | |
b5d67f64 | 917 | BTRFS_EXTENT_FLAG_DATA); |
7a9e9987 | 918 | have_csum = sblock_to_check->pagev[0]->have_csum; |
7a9e9987 | 919 | dev = sblock_to_check->pagev[0]->dev; |
13db62b7 | 920 | |
ff023aac SB |
921 | if (sctx->is_dev_replace && !is_metadata && !have_csum) { |
922 | sblocks_for_recheck = NULL; | |
923 | goto nodatasum_case; | |
924 | } | |
925 | ||
b5d67f64 SB |
926 | /* |
927 | * read all mirrors one after the other. This includes to | |
928 | * re-read the extent or metadata block that failed (that was | |
929 | * the cause that this fixup code is called) another time, | |
930 | * page by page this time in order to know which pages | |
931 | * caused I/O errors and which ones are good (for all mirrors). | |
932 | * It is the goal to handle the situation when more than one | |
933 | * mirror contains I/O errors, but the errors do not | |
934 | * overlap, i.e. the data can be repaired by selecting the | |
935 | * pages from those mirrors without I/O error on the | |
936 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) | |
937 | * would be that mirror #1 has an I/O error on the first page, | |
938 | * the second page is good, and mirror #2 has an I/O error on | |
939 | * the second page, but the first page is good. | |
940 | * Then the first page of the first mirror can be repaired by | |
941 | * taking the first page of the second mirror, and the | |
942 | * second page of the second mirror can be repaired by | |
943 | * copying the contents of the 2nd page of the 1st mirror. | |
944 | * One more note: if the pages of one mirror contain I/O | |
945 | * errors, the checksum cannot be verified. In order to get | |
946 | * the best data for repairing, the first attempt is to find | |
947 | * a mirror without I/O errors and with a validated checksum. | |
948 | * Only if this is not possible, the pages are picked from | |
949 | * mirrors with I/O errors without considering the checksum. | |
950 | * If the latter is the case, at the end, the checksum of the | |
951 | * repaired area is verified in order to correctly maintain | |
952 | * the statistics. | |
953 | */ | |
954 | ||
31e818fe DS |
955 | sblocks_for_recheck = kcalloc(BTRFS_MAX_MIRRORS, |
956 | sizeof(*sblocks_for_recheck), GFP_NOFS); | |
b5d67f64 | 957 | if (!sblocks_for_recheck) { |
d9d181c1 SB |
958 | spin_lock(&sctx->stat_lock); |
959 | sctx->stat.malloc_errors++; | |
960 | sctx->stat.read_errors++; | |
961 | sctx->stat.uncorrectable_errors++; | |
962 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 963 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 964 | goto out; |
a2de733c AJ |
965 | } |
966 | ||
b5d67f64 | 967 | /* setup the context, map the logical blocks and alloc the pages */ |
be50a8dd | 968 | ret = scrub_setup_recheck_block(sblock_to_check, sblocks_for_recheck); |
b5d67f64 | 969 | if (ret) { |
d9d181c1 SB |
970 | spin_lock(&sctx->stat_lock); |
971 | sctx->stat.read_errors++; | |
972 | sctx->stat.uncorrectable_errors++; | |
973 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 974 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 SB |
975 | goto out; |
976 | } | |
977 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); | |
978 | sblock_bad = sblocks_for_recheck + failed_mirror_index; | |
13db62b7 | 979 | |
b5d67f64 | 980 | /* build and submit the bios for the failed mirror, check checksums */ |
affe4a5a | 981 | scrub_recheck_block(fs_info, sblock_bad, 1); |
a2de733c | 982 | |
b5d67f64 SB |
983 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
984 | sblock_bad->no_io_error_seen) { | |
985 | /* | |
986 | * the error disappeared after reading page by page, or | |
987 | * the area was part of a huge bio and other parts of the | |
988 | * bio caused I/O errors, or the block layer merged several | |
989 | * read requests into one and the error is caused by a | |
990 | * different bio (usually one of the two latter cases is | |
991 | * the cause) | |
992 | */ | |
d9d181c1 SB |
993 | spin_lock(&sctx->stat_lock); |
994 | sctx->stat.unverified_errors++; | |
5a6ac9ea | 995 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 996 | spin_unlock(&sctx->stat_lock); |
a2de733c | 997 | |
ff023aac SB |
998 | if (sctx->is_dev_replace) |
999 | scrub_write_block_to_dev_replace(sblock_bad); | |
b5d67f64 | 1000 | goto out; |
a2de733c | 1001 | } |
a2de733c | 1002 | |
b5d67f64 | 1003 | if (!sblock_bad->no_io_error_seen) { |
d9d181c1 SB |
1004 | spin_lock(&sctx->stat_lock); |
1005 | sctx->stat.read_errors++; | |
1006 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
1007 | if (__ratelimit(&_rs)) |
1008 | scrub_print_warning("i/o error", sblock_to_check); | |
a36cf8b8 | 1009 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 1010 | } else if (sblock_bad->checksum_error) { |
d9d181c1 SB |
1011 | spin_lock(&sctx->stat_lock); |
1012 | sctx->stat.csum_errors++; | |
1013 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
1014 | if (__ratelimit(&_rs)) |
1015 | scrub_print_warning("checksum error", sblock_to_check); | |
a36cf8b8 | 1016 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 1017 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 1018 | } else if (sblock_bad->header_error) { |
d9d181c1 SB |
1019 | spin_lock(&sctx->stat_lock); |
1020 | sctx->stat.verify_errors++; | |
1021 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
1022 | if (__ratelimit(&_rs)) |
1023 | scrub_print_warning("checksum/header error", | |
1024 | sblock_to_check); | |
442a4f63 | 1025 | if (sblock_bad->generation_error) |
a36cf8b8 | 1026 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 SB |
1027 | BTRFS_DEV_STAT_GENERATION_ERRS); |
1028 | else | |
a36cf8b8 | 1029 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 1030 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 1031 | } |
a2de733c | 1032 | |
33ef30ad ID |
1033 | if (sctx->readonly) { |
1034 | ASSERT(!sctx->is_dev_replace); | |
1035 | goto out; | |
1036 | } | |
a2de733c | 1037 | |
b5d67f64 SB |
1038 | if (!is_metadata && !have_csum) { |
1039 | struct scrub_fixup_nodatasum *fixup_nodatasum; | |
a2de733c | 1040 | |
ff023aac SB |
1041 | WARN_ON(sctx->is_dev_replace); |
1042 | ||
b25c94c5 ZL |
1043 | nodatasum_case: |
1044 | ||
b5d67f64 SB |
1045 | /* |
1046 | * !is_metadata and !have_csum, this means that the data | |
1047 | * might not be COW'ed, that it might be modified | |
1048 | * concurrently. The general strategy to work on the | |
1049 | * commit root does not help in the case when COW is not | |
1050 | * used. | |
1051 | */ | |
1052 | fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS); | |
1053 | if (!fixup_nodatasum) | |
1054 | goto did_not_correct_error; | |
d9d181c1 | 1055 | fixup_nodatasum->sctx = sctx; |
a36cf8b8 | 1056 | fixup_nodatasum->dev = dev; |
b5d67f64 SB |
1057 | fixup_nodatasum->logical = logical; |
1058 | fixup_nodatasum->root = fs_info->extent_root; | |
1059 | fixup_nodatasum->mirror_num = failed_mirror_index + 1; | |
b6bfebc1 | 1060 | scrub_pending_trans_workers_inc(sctx); |
9e0af237 LB |
1061 | btrfs_init_work(&fixup_nodatasum->work, btrfs_scrub_helper, |
1062 | scrub_fixup_nodatasum, NULL, NULL); | |
0339ef2f QW |
1063 | btrfs_queue_work(fs_info->scrub_workers, |
1064 | &fixup_nodatasum->work); | |
b5d67f64 | 1065 | goto out; |
a2de733c AJ |
1066 | } |
1067 | ||
b5d67f64 SB |
1068 | /* |
1069 | * now build and submit the bios for the other mirrors, check | |
cb2ced73 SB |
1070 | * checksums. |
1071 | * First try to pick the mirror which is completely without I/O | |
b5d67f64 SB |
1072 | * errors and also does not have a checksum error. |
1073 | * If one is found, and if a checksum is present, the full block | |
1074 | * that is known to contain an error is rewritten. Afterwards | |
1075 | * the block is known to be corrected. | |
1076 | * If a mirror is found which is completely correct, and no | |
1077 | * checksum is present, only those pages are rewritten that had | |
1078 | * an I/O error in the block to be repaired, since it cannot be | |
1079 | * determined, which copy of the other pages is better (and it | |
1080 | * could happen otherwise that a correct page would be | |
1081 | * overwritten by a bad one). | |
1082 | */ | |
1083 | for (mirror_index = 0; | |
1084 | mirror_index < BTRFS_MAX_MIRRORS && | |
1085 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1086 | mirror_index++) { | |
cb2ced73 | 1087 | struct scrub_block *sblock_other; |
b5d67f64 | 1088 | |
cb2ced73 SB |
1089 | if (mirror_index == failed_mirror_index) |
1090 | continue; | |
1091 | sblock_other = sblocks_for_recheck + mirror_index; | |
1092 | ||
1093 | /* build and submit the bios, check checksums */ | |
affe4a5a | 1094 | scrub_recheck_block(fs_info, sblock_other, 0); |
34f5c8e9 SB |
1095 | |
1096 | if (!sblock_other->header_error && | |
b5d67f64 SB |
1097 | !sblock_other->checksum_error && |
1098 | sblock_other->no_io_error_seen) { | |
ff023aac SB |
1099 | if (sctx->is_dev_replace) { |
1100 | scrub_write_block_to_dev_replace(sblock_other); | |
114ab50d | 1101 | goto corrected_error; |
ff023aac | 1102 | } else { |
ff023aac | 1103 | ret = scrub_repair_block_from_good_copy( |
114ab50d ZL |
1104 | sblock_bad, sblock_other); |
1105 | if (!ret) | |
1106 | goto corrected_error; | |
ff023aac | 1107 | } |
b5d67f64 SB |
1108 | } |
1109 | } | |
a2de733c | 1110 | |
b968fed1 ZL |
1111 | if (sblock_bad->no_io_error_seen && !sctx->is_dev_replace) |
1112 | goto did_not_correct_error; | |
ff023aac SB |
1113 | |
1114 | /* | |
ff023aac | 1115 | * In case of I/O errors in the area that is supposed to be |
b5d67f64 SB |
1116 | * repaired, continue by picking good copies of those pages. |
1117 | * Select the good pages from mirrors to rewrite bad pages from | |
1118 | * the area to fix. Afterwards verify the checksum of the block | |
1119 | * that is supposed to be repaired. This verification step is | |
1120 | * only done for the purpose of statistic counting and for the | |
1121 | * final scrub report, whether errors remain. | |
1122 | * A perfect algorithm could make use of the checksum and try | |
1123 | * all possible combinations of pages from the different mirrors | |
1124 | * until the checksum verification succeeds. For example, when | |
1125 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page | |
1126 | * of mirror #2 is readable but the final checksum test fails, | |
1127 | * then the 2nd page of mirror #3 could be tried, whether now | |
1128 | * the final checksum succeedes. But this would be a rare | |
1129 | * exception and is therefore not implemented. At least it is | |
1130 | * avoided that the good copy is overwritten. | |
1131 | * A more useful improvement would be to pick the sectors | |
1132 | * without I/O error based on sector sizes (512 bytes on legacy | |
1133 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one | |
1134 | * mirror could be repaired by taking 512 byte of a different | |
1135 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE | |
1136 | * area are unreadable. | |
a2de733c | 1137 | */ |
b5d67f64 | 1138 | success = 1; |
b968fed1 ZL |
1139 | for (page_num = 0; page_num < sblock_bad->page_count; |
1140 | page_num++) { | |
7a9e9987 | 1141 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
b968fed1 | 1142 | struct scrub_block *sblock_other = NULL; |
b5d67f64 | 1143 | |
b968fed1 ZL |
1144 | /* skip no-io-error page in scrub */ |
1145 | if (!page_bad->io_error && !sctx->is_dev_replace) | |
a2de733c | 1146 | continue; |
b5d67f64 | 1147 | |
b968fed1 ZL |
1148 | /* try to find no-io-error page in mirrors */ |
1149 | if (page_bad->io_error) { | |
1150 | for (mirror_index = 0; | |
1151 | mirror_index < BTRFS_MAX_MIRRORS && | |
1152 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1153 | mirror_index++) { | |
1154 | if (!sblocks_for_recheck[mirror_index]. | |
1155 | pagev[page_num]->io_error) { | |
1156 | sblock_other = sblocks_for_recheck + | |
1157 | mirror_index; | |
1158 | break; | |
b5d67f64 SB |
1159 | } |
1160 | } | |
b968fed1 ZL |
1161 | if (!sblock_other) |
1162 | success = 0; | |
96e36920 | 1163 | } |
a2de733c | 1164 | |
b968fed1 ZL |
1165 | if (sctx->is_dev_replace) { |
1166 | /* | |
1167 | * did not find a mirror to fetch the page | |
1168 | * from. scrub_write_page_to_dev_replace() | |
1169 | * handles this case (page->io_error), by | |
1170 | * filling the block with zeros before | |
1171 | * submitting the write request | |
1172 | */ | |
1173 | if (!sblock_other) | |
1174 | sblock_other = sblock_bad; | |
1175 | ||
1176 | if (scrub_write_page_to_dev_replace(sblock_other, | |
1177 | page_num) != 0) { | |
1178 | btrfs_dev_replace_stats_inc( | |
1179 | &sctx->dev_root-> | |
1180 | fs_info->dev_replace. | |
1181 | num_write_errors); | |
1182 | success = 0; | |
1183 | } | |
1184 | } else if (sblock_other) { | |
1185 | ret = scrub_repair_page_from_good_copy(sblock_bad, | |
1186 | sblock_other, | |
1187 | page_num, 0); | |
1188 | if (0 == ret) | |
1189 | page_bad->io_error = 0; | |
1190 | else | |
1191 | success = 0; | |
b5d67f64 | 1192 | } |
a2de733c | 1193 | } |
a2de733c | 1194 | |
b968fed1 | 1195 | if (success && !sctx->is_dev_replace) { |
b5d67f64 SB |
1196 | if (is_metadata || have_csum) { |
1197 | /* | |
1198 | * need to verify the checksum now that all | |
1199 | * sectors on disk are repaired (the write | |
1200 | * request for data to be repaired is on its way). | |
1201 | * Just be lazy and use scrub_recheck_block() | |
1202 | * which re-reads the data before the checksum | |
1203 | * is verified, but most likely the data comes out | |
1204 | * of the page cache. | |
1205 | */ | |
affe4a5a | 1206 | scrub_recheck_block(fs_info, sblock_bad, 1); |
34f5c8e9 | 1207 | if (!sblock_bad->header_error && |
b5d67f64 SB |
1208 | !sblock_bad->checksum_error && |
1209 | sblock_bad->no_io_error_seen) | |
1210 | goto corrected_error; | |
1211 | else | |
1212 | goto did_not_correct_error; | |
1213 | } else { | |
1214 | corrected_error: | |
d9d181c1 SB |
1215 | spin_lock(&sctx->stat_lock); |
1216 | sctx->stat.corrected_errors++; | |
5a6ac9ea | 1217 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 1218 | spin_unlock(&sctx->stat_lock); |
b14af3b4 DS |
1219 | btrfs_err_rl_in_rcu(fs_info, |
1220 | "fixed up error at logical %llu on dev %s", | |
c1c9ff7c | 1221 | logical, rcu_str_deref(dev->name)); |
8628764e | 1222 | } |
b5d67f64 SB |
1223 | } else { |
1224 | did_not_correct_error: | |
d9d181c1 SB |
1225 | spin_lock(&sctx->stat_lock); |
1226 | sctx->stat.uncorrectable_errors++; | |
1227 | spin_unlock(&sctx->stat_lock); | |
b14af3b4 DS |
1228 | btrfs_err_rl_in_rcu(fs_info, |
1229 | "unable to fixup (regular) error at logical %llu on dev %s", | |
c1c9ff7c | 1230 | logical, rcu_str_deref(dev->name)); |
96e36920 | 1231 | } |
a2de733c | 1232 | |
b5d67f64 SB |
1233 | out: |
1234 | if (sblocks_for_recheck) { | |
1235 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; | |
1236 | mirror_index++) { | |
1237 | struct scrub_block *sblock = sblocks_for_recheck + | |
1238 | mirror_index; | |
af8e2d1d | 1239 | struct scrub_recover *recover; |
b5d67f64 SB |
1240 | int page_index; |
1241 | ||
7a9e9987 SB |
1242 | for (page_index = 0; page_index < sblock->page_count; |
1243 | page_index++) { | |
1244 | sblock->pagev[page_index]->sblock = NULL; | |
af8e2d1d MX |
1245 | recover = sblock->pagev[page_index]->recover; |
1246 | if (recover) { | |
1247 | scrub_put_recover(recover); | |
1248 | sblock->pagev[page_index]->recover = | |
1249 | NULL; | |
1250 | } | |
7a9e9987 SB |
1251 | scrub_page_put(sblock->pagev[page_index]); |
1252 | } | |
b5d67f64 SB |
1253 | } |
1254 | kfree(sblocks_for_recheck); | |
1255 | } | |
a2de733c | 1256 | |
b5d67f64 SB |
1257 | return 0; |
1258 | } | |
a2de733c | 1259 | |
8e5cfb55 | 1260 | static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio) |
af8e2d1d | 1261 | { |
10f11900 ZL |
1262 | if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5) |
1263 | return 2; | |
1264 | else if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID6) | |
1265 | return 3; | |
1266 | else | |
af8e2d1d | 1267 | return (int)bbio->num_stripes; |
af8e2d1d MX |
1268 | } |
1269 | ||
10f11900 ZL |
1270 | static inline void scrub_stripe_index_and_offset(u64 logical, u64 map_type, |
1271 | u64 *raid_map, | |
af8e2d1d MX |
1272 | u64 mapped_length, |
1273 | int nstripes, int mirror, | |
1274 | int *stripe_index, | |
1275 | u64 *stripe_offset) | |
1276 | { | |
1277 | int i; | |
1278 | ||
ffe2d203 | 1279 | if (map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
af8e2d1d MX |
1280 | /* RAID5/6 */ |
1281 | for (i = 0; i < nstripes; i++) { | |
1282 | if (raid_map[i] == RAID6_Q_STRIPE || | |
1283 | raid_map[i] == RAID5_P_STRIPE) | |
1284 | continue; | |
1285 | ||
1286 | if (logical >= raid_map[i] && | |
1287 | logical < raid_map[i] + mapped_length) | |
1288 | break; | |
1289 | } | |
1290 | ||
1291 | *stripe_index = i; | |
1292 | *stripe_offset = logical - raid_map[i]; | |
1293 | } else { | |
1294 | /* The other RAID type */ | |
1295 | *stripe_index = mirror; | |
1296 | *stripe_offset = 0; | |
1297 | } | |
1298 | } | |
1299 | ||
be50a8dd | 1300 | static int scrub_setup_recheck_block(struct scrub_block *original_sblock, |
b5d67f64 SB |
1301 | struct scrub_block *sblocks_for_recheck) |
1302 | { | |
be50a8dd ZL |
1303 | struct scrub_ctx *sctx = original_sblock->sctx; |
1304 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
1305 | u64 length = original_sblock->page_count * PAGE_SIZE; | |
1306 | u64 logical = original_sblock->pagev[0]->logical; | |
4734b7ed ZL |
1307 | u64 generation = original_sblock->pagev[0]->generation; |
1308 | u64 flags = original_sblock->pagev[0]->flags; | |
1309 | u64 have_csum = original_sblock->pagev[0]->have_csum; | |
af8e2d1d MX |
1310 | struct scrub_recover *recover; |
1311 | struct btrfs_bio *bbio; | |
af8e2d1d MX |
1312 | u64 sublen; |
1313 | u64 mapped_length; | |
1314 | u64 stripe_offset; | |
1315 | int stripe_index; | |
be50a8dd | 1316 | int page_index = 0; |
b5d67f64 | 1317 | int mirror_index; |
af8e2d1d | 1318 | int nmirrors; |
b5d67f64 SB |
1319 | int ret; |
1320 | ||
1321 | /* | |
57019345 | 1322 | * note: the two members refs and outstanding_pages |
b5d67f64 SB |
1323 | * are not used (and not set) in the blocks that are used for |
1324 | * the recheck procedure | |
1325 | */ | |
1326 | ||
b5d67f64 | 1327 | while (length > 0) { |
af8e2d1d MX |
1328 | sublen = min_t(u64, length, PAGE_SIZE); |
1329 | mapped_length = sublen; | |
1330 | bbio = NULL; | |
a2de733c | 1331 | |
b5d67f64 SB |
1332 | /* |
1333 | * with a length of PAGE_SIZE, each returned stripe | |
1334 | * represents one mirror | |
1335 | */ | |
af8e2d1d | 1336 | ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical, |
8e5cfb55 | 1337 | &mapped_length, &bbio, 0, 1); |
b5d67f64 | 1338 | if (ret || !bbio || mapped_length < sublen) { |
6e9606d2 | 1339 | btrfs_put_bbio(bbio); |
b5d67f64 SB |
1340 | return -EIO; |
1341 | } | |
a2de733c | 1342 | |
af8e2d1d MX |
1343 | recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS); |
1344 | if (!recover) { | |
6e9606d2 | 1345 | btrfs_put_bbio(bbio); |
af8e2d1d MX |
1346 | return -ENOMEM; |
1347 | } | |
1348 | ||
1349 | atomic_set(&recover->refs, 1); | |
1350 | recover->bbio = bbio; | |
af8e2d1d MX |
1351 | recover->map_length = mapped_length; |
1352 | ||
ff023aac | 1353 | BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO); |
af8e2d1d | 1354 | |
be50a8dd | 1355 | nmirrors = min(scrub_nr_raid_mirrors(bbio), BTRFS_MAX_MIRRORS); |
10f11900 | 1356 | |
af8e2d1d | 1357 | for (mirror_index = 0; mirror_index < nmirrors; |
b5d67f64 SB |
1358 | mirror_index++) { |
1359 | struct scrub_block *sblock; | |
1360 | struct scrub_page *page; | |
1361 | ||
b5d67f64 | 1362 | sblock = sblocks_for_recheck + mirror_index; |
7a9e9987 | 1363 | sblock->sctx = sctx; |
4734b7ed | 1364 | |
7a9e9987 SB |
1365 | page = kzalloc(sizeof(*page), GFP_NOFS); |
1366 | if (!page) { | |
1367 | leave_nomem: | |
d9d181c1 SB |
1368 | spin_lock(&sctx->stat_lock); |
1369 | sctx->stat.malloc_errors++; | |
1370 | spin_unlock(&sctx->stat_lock); | |
af8e2d1d | 1371 | scrub_put_recover(recover); |
b5d67f64 SB |
1372 | return -ENOMEM; |
1373 | } | |
7a9e9987 SB |
1374 | scrub_page_get(page); |
1375 | sblock->pagev[page_index] = page; | |
4734b7ed ZL |
1376 | page->sblock = sblock; |
1377 | page->flags = flags; | |
1378 | page->generation = generation; | |
7a9e9987 | 1379 | page->logical = logical; |
4734b7ed ZL |
1380 | page->have_csum = have_csum; |
1381 | if (have_csum) | |
1382 | memcpy(page->csum, | |
1383 | original_sblock->pagev[0]->csum, | |
1384 | sctx->csum_size); | |
af8e2d1d | 1385 | |
10f11900 ZL |
1386 | scrub_stripe_index_and_offset(logical, |
1387 | bbio->map_type, | |
1388 | bbio->raid_map, | |
af8e2d1d | 1389 | mapped_length, |
e34c330d ZL |
1390 | bbio->num_stripes - |
1391 | bbio->num_tgtdevs, | |
af8e2d1d MX |
1392 | mirror_index, |
1393 | &stripe_index, | |
1394 | &stripe_offset); | |
1395 | page->physical = bbio->stripes[stripe_index].physical + | |
1396 | stripe_offset; | |
1397 | page->dev = bbio->stripes[stripe_index].dev; | |
1398 | ||
ff023aac SB |
1399 | BUG_ON(page_index >= original_sblock->page_count); |
1400 | page->physical_for_dev_replace = | |
1401 | original_sblock->pagev[page_index]-> | |
1402 | physical_for_dev_replace; | |
7a9e9987 | 1403 | /* for missing devices, dev->bdev is NULL */ |
7a9e9987 | 1404 | page->mirror_num = mirror_index + 1; |
b5d67f64 | 1405 | sblock->page_count++; |
7a9e9987 SB |
1406 | page->page = alloc_page(GFP_NOFS); |
1407 | if (!page->page) | |
1408 | goto leave_nomem; | |
af8e2d1d MX |
1409 | |
1410 | scrub_get_recover(recover); | |
1411 | page->recover = recover; | |
b5d67f64 | 1412 | } |
af8e2d1d | 1413 | scrub_put_recover(recover); |
b5d67f64 SB |
1414 | length -= sublen; |
1415 | logical += sublen; | |
1416 | page_index++; | |
1417 | } | |
1418 | ||
1419 | return 0; | |
96e36920 ID |
1420 | } |
1421 | ||
af8e2d1d MX |
1422 | struct scrub_bio_ret { |
1423 | struct completion event; | |
1424 | int error; | |
1425 | }; | |
1426 | ||
4246a0b6 | 1427 | static void scrub_bio_wait_endio(struct bio *bio) |
af8e2d1d MX |
1428 | { |
1429 | struct scrub_bio_ret *ret = bio->bi_private; | |
1430 | ||
4246a0b6 | 1431 | ret->error = bio->bi_error; |
af8e2d1d MX |
1432 | complete(&ret->event); |
1433 | } | |
1434 | ||
1435 | static inline int scrub_is_page_on_raid56(struct scrub_page *page) | |
1436 | { | |
10f11900 | 1437 | return page->recover && |
ffe2d203 | 1438 | (page->recover->bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK); |
af8e2d1d MX |
1439 | } |
1440 | ||
1441 | static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info, | |
1442 | struct bio *bio, | |
1443 | struct scrub_page *page) | |
1444 | { | |
1445 | struct scrub_bio_ret done; | |
1446 | int ret; | |
1447 | ||
1448 | init_completion(&done.event); | |
1449 | done.error = 0; | |
1450 | bio->bi_iter.bi_sector = page->logical >> 9; | |
1451 | bio->bi_private = &done; | |
1452 | bio->bi_end_io = scrub_bio_wait_endio; | |
1453 | ||
1454 | ret = raid56_parity_recover(fs_info->fs_root, bio, page->recover->bbio, | |
af8e2d1d | 1455 | page->recover->map_length, |
4245215d | 1456 | page->mirror_num, 0); |
af8e2d1d MX |
1457 | if (ret) |
1458 | return ret; | |
1459 | ||
1460 | wait_for_completion(&done.event); | |
1461 | if (done.error) | |
1462 | return -EIO; | |
1463 | ||
1464 | return 0; | |
1465 | } | |
1466 | ||
b5d67f64 SB |
1467 | /* |
1468 | * this function will check the on disk data for checksum errors, header | |
1469 | * errors and read I/O errors. If any I/O errors happen, the exact pages | |
1470 | * which are errored are marked as being bad. The goal is to enable scrub | |
1471 | * to take those pages that are not errored from all the mirrors so that | |
1472 | * the pages that are errored in the just handled mirror can be repaired. | |
1473 | */ | |
34f5c8e9 | 1474 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
affe4a5a ZL |
1475 | struct scrub_block *sblock, |
1476 | int retry_failed_mirror) | |
96e36920 | 1477 | { |
b5d67f64 | 1478 | int page_num; |
96e36920 | 1479 | |
b5d67f64 | 1480 | sblock->no_io_error_seen = 1; |
96e36920 | 1481 | |
b5d67f64 SB |
1482 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1483 | struct bio *bio; | |
7a9e9987 | 1484 | struct scrub_page *page = sblock->pagev[page_num]; |
b5d67f64 | 1485 | |
442a4f63 | 1486 | if (page->dev->bdev == NULL) { |
ea9947b4 SB |
1487 | page->io_error = 1; |
1488 | sblock->no_io_error_seen = 0; | |
1489 | continue; | |
1490 | } | |
1491 | ||
7a9e9987 | 1492 | WARN_ON(!page->page); |
9be3395b | 1493 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
34f5c8e9 SB |
1494 | if (!bio) { |
1495 | page->io_error = 1; | |
1496 | sblock->no_io_error_seen = 0; | |
1497 | continue; | |
1498 | } | |
442a4f63 | 1499 | bio->bi_bdev = page->dev->bdev; |
b5d67f64 | 1500 | |
34f5c8e9 | 1501 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
af8e2d1d MX |
1502 | if (!retry_failed_mirror && scrub_is_page_on_raid56(page)) { |
1503 | if (scrub_submit_raid56_bio_wait(fs_info, bio, page)) | |
1504 | sblock->no_io_error_seen = 0; | |
1505 | } else { | |
1506 | bio->bi_iter.bi_sector = page->physical >> 9; | |
1507 | ||
1508 | if (btrfsic_submit_bio_wait(READ, bio)) | |
1509 | sblock->no_io_error_seen = 0; | |
1510 | } | |
33879d45 | 1511 | |
b5d67f64 SB |
1512 | bio_put(bio); |
1513 | } | |
96e36920 | 1514 | |
b5d67f64 | 1515 | if (sblock->no_io_error_seen) |
ba7cf988 | 1516 | scrub_recheck_block_checksum(sblock); |
b5d67f64 | 1517 | |
34f5c8e9 | 1518 | return; |
a2de733c AJ |
1519 | } |
1520 | ||
17a9be2f MX |
1521 | static inline int scrub_check_fsid(u8 fsid[], |
1522 | struct scrub_page *spage) | |
1523 | { | |
1524 | struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices; | |
1525 | int ret; | |
1526 | ||
1527 | ret = memcmp(fsid, fs_devices->fsid, BTRFS_UUID_SIZE); | |
1528 | return !ret; | |
1529 | } | |
1530 | ||
ba7cf988 | 1531 | static void scrub_recheck_block_checksum(struct scrub_block *sblock) |
a2de733c | 1532 | { |
ba7cf988 ZL |
1533 | sblock->header_error = 0; |
1534 | sblock->checksum_error = 0; | |
1535 | sblock->generation_error = 0; | |
b5d67f64 | 1536 | |
ba7cf988 ZL |
1537 | if (sblock->pagev[0]->flags & BTRFS_EXTENT_FLAG_DATA) |
1538 | scrub_checksum_data(sblock); | |
1539 | else | |
1540 | scrub_checksum_tree_block(sblock); | |
a2de733c AJ |
1541 | } |
1542 | ||
b5d67f64 | 1543 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
114ab50d | 1544 | struct scrub_block *sblock_good) |
b5d67f64 SB |
1545 | { |
1546 | int page_num; | |
1547 | int ret = 0; | |
96e36920 | 1548 | |
b5d67f64 SB |
1549 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
1550 | int ret_sub; | |
96e36920 | 1551 | |
b5d67f64 SB |
1552 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
1553 | sblock_good, | |
114ab50d | 1554 | page_num, 1); |
b5d67f64 SB |
1555 | if (ret_sub) |
1556 | ret = ret_sub; | |
a2de733c | 1557 | } |
b5d67f64 SB |
1558 | |
1559 | return ret; | |
1560 | } | |
1561 | ||
1562 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
1563 | struct scrub_block *sblock_good, | |
1564 | int page_num, int force_write) | |
1565 | { | |
7a9e9987 SB |
1566 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
1567 | struct scrub_page *page_good = sblock_good->pagev[page_num]; | |
b5d67f64 | 1568 | |
7a9e9987 SB |
1569 | BUG_ON(page_bad->page == NULL); |
1570 | BUG_ON(page_good->page == NULL); | |
b5d67f64 SB |
1571 | if (force_write || sblock_bad->header_error || |
1572 | sblock_bad->checksum_error || page_bad->io_error) { | |
1573 | struct bio *bio; | |
1574 | int ret; | |
b5d67f64 | 1575 | |
ff023aac | 1576 | if (!page_bad->dev->bdev) { |
94647322 | 1577 | btrfs_warn_rl(sblock_bad->sctx->dev_root->fs_info, |
efe120a0 | 1578 | "scrub_repair_page_from_good_copy(bdev == NULL) " |
94647322 | 1579 | "is unexpected"); |
ff023aac SB |
1580 | return -EIO; |
1581 | } | |
1582 | ||
9be3395b | 1583 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
e627ee7b TI |
1584 | if (!bio) |
1585 | return -EIO; | |
442a4f63 | 1586 | bio->bi_bdev = page_bad->dev->bdev; |
4f024f37 | 1587 | bio->bi_iter.bi_sector = page_bad->physical >> 9; |
b5d67f64 SB |
1588 | |
1589 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); | |
1590 | if (PAGE_SIZE != ret) { | |
1591 | bio_put(bio); | |
1592 | return -EIO; | |
13db62b7 | 1593 | } |
b5d67f64 | 1594 | |
33879d45 | 1595 | if (btrfsic_submit_bio_wait(WRITE, bio)) { |
442a4f63 SB |
1596 | btrfs_dev_stat_inc_and_print(page_bad->dev, |
1597 | BTRFS_DEV_STAT_WRITE_ERRS); | |
ff023aac SB |
1598 | btrfs_dev_replace_stats_inc( |
1599 | &sblock_bad->sctx->dev_root->fs_info-> | |
1600 | dev_replace.num_write_errors); | |
442a4f63 SB |
1601 | bio_put(bio); |
1602 | return -EIO; | |
1603 | } | |
b5d67f64 | 1604 | bio_put(bio); |
a2de733c AJ |
1605 | } |
1606 | ||
b5d67f64 SB |
1607 | return 0; |
1608 | } | |
1609 | ||
ff023aac SB |
1610 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
1611 | { | |
1612 | int page_num; | |
1613 | ||
5a6ac9ea MX |
1614 | /* |
1615 | * This block is used for the check of the parity on the source device, | |
1616 | * so the data needn't be written into the destination device. | |
1617 | */ | |
1618 | if (sblock->sparity) | |
1619 | return; | |
1620 | ||
ff023aac SB |
1621 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1622 | int ret; | |
1623 | ||
1624 | ret = scrub_write_page_to_dev_replace(sblock, page_num); | |
1625 | if (ret) | |
1626 | btrfs_dev_replace_stats_inc( | |
1627 | &sblock->sctx->dev_root->fs_info->dev_replace. | |
1628 | num_write_errors); | |
1629 | } | |
1630 | } | |
1631 | ||
1632 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
1633 | int page_num) | |
1634 | { | |
1635 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1636 | ||
1637 | BUG_ON(spage->page == NULL); | |
1638 | if (spage->io_error) { | |
1639 | void *mapped_buffer = kmap_atomic(spage->page); | |
1640 | ||
1641 | memset(mapped_buffer, 0, PAGE_CACHE_SIZE); | |
1642 | flush_dcache_page(spage->page); | |
1643 | kunmap_atomic(mapped_buffer); | |
1644 | } | |
1645 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); | |
1646 | } | |
1647 | ||
1648 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
1649 | struct scrub_page *spage) | |
1650 | { | |
1651 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1652 | struct scrub_bio *sbio; | |
1653 | int ret; | |
1654 | ||
1655 | mutex_lock(&wr_ctx->wr_lock); | |
1656 | again: | |
1657 | if (!wr_ctx->wr_curr_bio) { | |
1658 | wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio), | |
1659 | GFP_NOFS); | |
1660 | if (!wr_ctx->wr_curr_bio) { | |
1661 | mutex_unlock(&wr_ctx->wr_lock); | |
1662 | return -ENOMEM; | |
1663 | } | |
1664 | wr_ctx->wr_curr_bio->sctx = sctx; | |
1665 | wr_ctx->wr_curr_bio->page_count = 0; | |
1666 | } | |
1667 | sbio = wr_ctx->wr_curr_bio; | |
1668 | if (sbio->page_count == 0) { | |
1669 | struct bio *bio; | |
1670 | ||
1671 | sbio->physical = spage->physical_for_dev_replace; | |
1672 | sbio->logical = spage->logical; | |
1673 | sbio->dev = wr_ctx->tgtdev; | |
1674 | bio = sbio->bio; | |
1675 | if (!bio) { | |
9be3395b | 1676 | bio = btrfs_io_bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio); |
ff023aac SB |
1677 | if (!bio) { |
1678 | mutex_unlock(&wr_ctx->wr_lock); | |
1679 | return -ENOMEM; | |
1680 | } | |
1681 | sbio->bio = bio; | |
1682 | } | |
1683 | ||
1684 | bio->bi_private = sbio; | |
1685 | bio->bi_end_io = scrub_wr_bio_end_io; | |
1686 | bio->bi_bdev = sbio->dev->bdev; | |
4f024f37 | 1687 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
ff023aac SB |
1688 | sbio->err = 0; |
1689 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != | |
1690 | spage->physical_for_dev_replace || | |
1691 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
1692 | spage->logical) { | |
1693 | scrub_wr_submit(sctx); | |
1694 | goto again; | |
1695 | } | |
1696 | ||
1697 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1698 | if (ret != PAGE_SIZE) { | |
1699 | if (sbio->page_count < 1) { | |
1700 | bio_put(sbio->bio); | |
1701 | sbio->bio = NULL; | |
1702 | mutex_unlock(&wr_ctx->wr_lock); | |
1703 | return -EIO; | |
1704 | } | |
1705 | scrub_wr_submit(sctx); | |
1706 | goto again; | |
1707 | } | |
1708 | ||
1709 | sbio->pagev[sbio->page_count] = spage; | |
1710 | scrub_page_get(spage); | |
1711 | sbio->page_count++; | |
1712 | if (sbio->page_count == wr_ctx->pages_per_wr_bio) | |
1713 | scrub_wr_submit(sctx); | |
1714 | mutex_unlock(&wr_ctx->wr_lock); | |
1715 | ||
1716 | return 0; | |
1717 | } | |
1718 | ||
1719 | static void scrub_wr_submit(struct scrub_ctx *sctx) | |
1720 | { | |
1721 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1722 | struct scrub_bio *sbio; | |
1723 | ||
1724 | if (!wr_ctx->wr_curr_bio) | |
1725 | return; | |
1726 | ||
1727 | sbio = wr_ctx->wr_curr_bio; | |
1728 | wr_ctx->wr_curr_bio = NULL; | |
1729 | WARN_ON(!sbio->bio->bi_bdev); | |
1730 | scrub_pending_bio_inc(sctx); | |
1731 | /* process all writes in a single worker thread. Then the block layer | |
1732 | * orders the requests before sending them to the driver which | |
1733 | * doubled the write performance on spinning disks when measured | |
1734 | * with Linux 3.5 */ | |
1735 | btrfsic_submit_bio(WRITE, sbio->bio); | |
1736 | } | |
1737 | ||
4246a0b6 | 1738 | static void scrub_wr_bio_end_io(struct bio *bio) |
ff023aac SB |
1739 | { |
1740 | struct scrub_bio *sbio = bio->bi_private; | |
1741 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; | |
1742 | ||
4246a0b6 | 1743 | sbio->err = bio->bi_error; |
ff023aac SB |
1744 | sbio->bio = bio; |
1745 | ||
9e0af237 LB |
1746 | btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper, |
1747 | scrub_wr_bio_end_io_worker, NULL, NULL); | |
0339ef2f | 1748 | btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work); |
ff023aac SB |
1749 | } |
1750 | ||
1751 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) | |
1752 | { | |
1753 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
1754 | struct scrub_ctx *sctx = sbio->sctx; | |
1755 | int i; | |
1756 | ||
1757 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); | |
1758 | if (sbio->err) { | |
1759 | struct btrfs_dev_replace *dev_replace = | |
1760 | &sbio->sctx->dev_root->fs_info->dev_replace; | |
1761 | ||
1762 | for (i = 0; i < sbio->page_count; i++) { | |
1763 | struct scrub_page *spage = sbio->pagev[i]; | |
1764 | ||
1765 | spage->io_error = 1; | |
1766 | btrfs_dev_replace_stats_inc(&dev_replace-> | |
1767 | num_write_errors); | |
1768 | } | |
1769 | } | |
1770 | ||
1771 | for (i = 0; i < sbio->page_count; i++) | |
1772 | scrub_page_put(sbio->pagev[i]); | |
1773 | ||
1774 | bio_put(sbio->bio); | |
1775 | kfree(sbio); | |
1776 | scrub_pending_bio_dec(sctx); | |
1777 | } | |
1778 | ||
1779 | static int scrub_checksum(struct scrub_block *sblock) | |
b5d67f64 SB |
1780 | { |
1781 | u64 flags; | |
1782 | int ret; | |
1783 | ||
ba7cf988 ZL |
1784 | /* |
1785 | * No need to initialize these stats currently, | |
1786 | * because this function only use return value | |
1787 | * instead of these stats value. | |
1788 | * | |
1789 | * Todo: | |
1790 | * always use stats | |
1791 | */ | |
1792 | sblock->header_error = 0; | |
1793 | sblock->generation_error = 0; | |
1794 | sblock->checksum_error = 0; | |
1795 | ||
7a9e9987 SB |
1796 | WARN_ON(sblock->page_count < 1); |
1797 | flags = sblock->pagev[0]->flags; | |
b5d67f64 SB |
1798 | ret = 0; |
1799 | if (flags & BTRFS_EXTENT_FLAG_DATA) | |
1800 | ret = scrub_checksum_data(sblock); | |
1801 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) | |
1802 | ret = scrub_checksum_tree_block(sblock); | |
1803 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
1804 | (void)scrub_checksum_super(sblock); | |
1805 | else | |
1806 | WARN_ON(1); | |
1807 | if (ret) | |
1808 | scrub_handle_errored_block(sblock); | |
ff023aac SB |
1809 | |
1810 | return ret; | |
a2de733c AJ |
1811 | } |
1812 | ||
b5d67f64 | 1813 | static int scrub_checksum_data(struct scrub_block *sblock) |
a2de733c | 1814 | { |
d9d181c1 | 1815 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1816 | u8 csum[BTRFS_CSUM_SIZE]; |
b5d67f64 SB |
1817 | u8 *on_disk_csum; |
1818 | struct page *page; | |
1819 | void *buffer; | |
a2de733c | 1820 | u32 crc = ~(u32)0; |
b5d67f64 SB |
1821 | u64 len; |
1822 | int index; | |
a2de733c | 1823 | |
b5d67f64 | 1824 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1825 | if (!sblock->pagev[0]->have_csum) |
a2de733c AJ |
1826 | return 0; |
1827 | ||
7a9e9987 SB |
1828 | on_disk_csum = sblock->pagev[0]->csum; |
1829 | page = sblock->pagev[0]->page; | |
9613bebb | 1830 | buffer = kmap_atomic(page); |
b5d67f64 | 1831 | |
d9d181c1 | 1832 | len = sctx->sectorsize; |
b5d67f64 SB |
1833 | index = 0; |
1834 | for (;;) { | |
1835 | u64 l = min_t(u64, len, PAGE_SIZE); | |
1836 | ||
b0496686 | 1837 | crc = btrfs_csum_data(buffer, crc, l); |
9613bebb | 1838 | kunmap_atomic(buffer); |
b5d67f64 SB |
1839 | len -= l; |
1840 | if (len == 0) | |
1841 | break; | |
1842 | index++; | |
1843 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1844 | BUG_ON(!sblock->pagev[index]->page); |
1845 | page = sblock->pagev[index]->page; | |
9613bebb | 1846 | buffer = kmap_atomic(page); |
b5d67f64 SB |
1847 | } |
1848 | ||
a2de733c | 1849 | btrfs_csum_final(crc, csum); |
d9d181c1 | 1850 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
ba7cf988 | 1851 | sblock->checksum_error = 1; |
a2de733c | 1852 | |
ba7cf988 | 1853 | return sblock->checksum_error; |
a2de733c AJ |
1854 | } |
1855 | ||
b5d67f64 | 1856 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
a2de733c | 1857 | { |
d9d181c1 | 1858 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1859 | struct btrfs_header *h; |
a36cf8b8 | 1860 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 1861 | struct btrfs_fs_info *fs_info = root->fs_info; |
b5d67f64 SB |
1862 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1863 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1864 | struct page *page; | |
1865 | void *mapped_buffer; | |
1866 | u64 mapped_size; | |
1867 | void *p; | |
a2de733c | 1868 | u32 crc = ~(u32)0; |
b5d67f64 SB |
1869 | u64 len; |
1870 | int index; | |
1871 | ||
1872 | BUG_ON(sblock->page_count < 1); | |
7a9e9987 | 1873 | page = sblock->pagev[0]->page; |
9613bebb | 1874 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1875 | h = (struct btrfs_header *)mapped_buffer; |
d9d181c1 | 1876 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
a2de733c AJ |
1877 | |
1878 | /* | |
1879 | * we don't use the getter functions here, as we | |
1880 | * a) don't have an extent buffer and | |
1881 | * b) the page is already kmapped | |
1882 | */ | |
3cae210f | 1883 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h)) |
ba7cf988 | 1884 | sblock->header_error = 1; |
a2de733c | 1885 | |
ba7cf988 ZL |
1886 | if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h)) { |
1887 | sblock->header_error = 1; | |
1888 | sblock->generation_error = 1; | |
1889 | } | |
a2de733c | 1890 | |
17a9be2f | 1891 | if (!scrub_check_fsid(h->fsid, sblock->pagev[0])) |
ba7cf988 | 1892 | sblock->header_error = 1; |
a2de733c AJ |
1893 | |
1894 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
1895 | BTRFS_UUID_SIZE)) | |
ba7cf988 | 1896 | sblock->header_error = 1; |
a2de733c | 1897 | |
d9d181c1 | 1898 | len = sctx->nodesize - BTRFS_CSUM_SIZE; |
b5d67f64 SB |
1899 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
1900 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1901 | index = 0; | |
1902 | for (;;) { | |
1903 | u64 l = min_t(u64, len, mapped_size); | |
1904 | ||
b0496686 | 1905 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 1906 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1907 | len -= l; |
1908 | if (len == 0) | |
1909 | break; | |
1910 | index++; | |
1911 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1912 | BUG_ON(!sblock->pagev[index]->page); |
1913 | page = sblock->pagev[index]->page; | |
9613bebb | 1914 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1915 | mapped_size = PAGE_SIZE; |
1916 | p = mapped_buffer; | |
1917 | } | |
1918 | ||
1919 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1920 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
ba7cf988 | 1921 | sblock->checksum_error = 1; |
a2de733c | 1922 | |
ba7cf988 | 1923 | return sblock->header_error || sblock->checksum_error; |
a2de733c AJ |
1924 | } |
1925 | ||
b5d67f64 | 1926 | static int scrub_checksum_super(struct scrub_block *sblock) |
a2de733c AJ |
1927 | { |
1928 | struct btrfs_super_block *s; | |
d9d181c1 | 1929 | struct scrub_ctx *sctx = sblock->sctx; |
b5d67f64 SB |
1930 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1931 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1932 | struct page *page; | |
1933 | void *mapped_buffer; | |
1934 | u64 mapped_size; | |
1935 | void *p; | |
a2de733c | 1936 | u32 crc = ~(u32)0; |
442a4f63 SB |
1937 | int fail_gen = 0; |
1938 | int fail_cor = 0; | |
b5d67f64 SB |
1939 | u64 len; |
1940 | int index; | |
a2de733c | 1941 | |
b5d67f64 | 1942 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1943 | page = sblock->pagev[0]->page; |
9613bebb | 1944 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1945 | s = (struct btrfs_super_block *)mapped_buffer; |
d9d181c1 | 1946 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
a2de733c | 1947 | |
3cae210f | 1948 | if (sblock->pagev[0]->logical != btrfs_super_bytenr(s)) |
442a4f63 | 1949 | ++fail_cor; |
a2de733c | 1950 | |
3cae210f | 1951 | if (sblock->pagev[0]->generation != btrfs_super_generation(s)) |
442a4f63 | 1952 | ++fail_gen; |
a2de733c | 1953 | |
17a9be2f | 1954 | if (!scrub_check_fsid(s->fsid, sblock->pagev[0])) |
442a4f63 | 1955 | ++fail_cor; |
a2de733c | 1956 | |
b5d67f64 SB |
1957 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
1958 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; | |
1959 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1960 | index = 0; | |
1961 | for (;;) { | |
1962 | u64 l = min_t(u64, len, mapped_size); | |
1963 | ||
b0496686 | 1964 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 1965 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1966 | len -= l; |
1967 | if (len == 0) | |
1968 | break; | |
1969 | index++; | |
1970 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1971 | BUG_ON(!sblock->pagev[index]->page); |
1972 | page = sblock->pagev[index]->page; | |
9613bebb | 1973 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1974 | mapped_size = PAGE_SIZE; |
1975 | p = mapped_buffer; | |
1976 | } | |
1977 | ||
1978 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1979 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
442a4f63 | 1980 | ++fail_cor; |
a2de733c | 1981 | |
442a4f63 | 1982 | if (fail_cor + fail_gen) { |
a2de733c AJ |
1983 | /* |
1984 | * if we find an error in a super block, we just report it. | |
1985 | * They will get written with the next transaction commit | |
1986 | * anyway | |
1987 | */ | |
d9d181c1 SB |
1988 | spin_lock(&sctx->stat_lock); |
1989 | ++sctx->stat.super_errors; | |
1990 | spin_unlock(&sctx->stat_lock); | |
442a4f63 | 1991 | if (fail_cor) |
7a9e9987 | 1992 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 SB |
1993 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
1994 | else | |
7a9e9987 | 1995 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 | 1996 | BTRFS_DEV_STAT_GENERATION_ERRS); |
a2de733c AJ |
1997 | } |
1998 | ||
442a4f63 | 1999 | return fail_cor + fail_gen; |
a2de733c AJ |
2000 | } |
2001 | ||
b5d67f64 SB |
2002 | static void scrub_block_get(struct scrub_block *sblock) |
2003 | { | |
57019345 | 2004 | atomic_inc(&sblock->refs); |
b5d67f64 SB |
2005 | } |
2006 | ||
2007 | static void scrub_block_put(struct scrub_block *sblock) | |
2008 | { | |
57019345 | 2009 | if (atomic_dec_and_test(&sblock->refs)) { |
b5d67f64 SB |
2010 | int i; |
2011 | ||
5a6ac9ea MX |
2012 | if (sblock->sparity) |
2013 | scrub_parity_put(sblock->sparity); | |
2014 | ||
b5d67f64 | 2015 | for (i = 0; i < sblock->page_count; i++) |
7a9e9987 | 2016 | scrub_page_put(sblock->pagev[i]); |
b5d67f64 SB |
2017 | kfree(sblock); |
2018 | } | |
2019 | } | |
2020 | ||
7a9e9987 SB |
2021 | static void scrub_page_get(struct scrub_page *spage) |
2022 | { | |
57019345 | 2023 | atomic_inc(&spage->refs); |
7a9e9987 SB |
2024 | } |
2025 | ||
2026 | static void scrub_page_put(struct scrub_page *spage) | |
2027 | { | |
57019345 | 2028 | if (atomic_dec_and_test(&spage->refs)) { |
7a9e9987 SB |
2029 | if (spage->page) |
2030 | __free_page(spage->page); | |
2031 | kfree(spage); | |
2032 | } | |
2033 | } | |
2034 | ||
d9d181c1 | 2035 | static void scrub_submit(struct scrub_ctx *sctx) |
a2de733c AJ |
2036 | { |
2037 | struct scrub_bio *sbio; | |
2038 | ||
d9d181c1 | 2039 | if (sctx->curr == -1) |
1623edeb | 2040 | return; |
a2de733c | 2041 | |
d9d181c1 SB |
2042 | sbio = sctx->bios[sctx->curr]; |
2043 | sctx->curr = -1; | |
b6bfebc1 | 2044 | scrub_pending_bio_inc(sctx); |
03679ade | 2045 | btrfsic_submit_bio(READ, sbio->bio); |
a2de733c AJ |
2046 | } |
2047 | ||
ff023aac SB |
2048 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
2049 | struct scrub_page *spage) | |
a2de733c | 2050 | { |
b5d67f64 | 2051 | struct scrub_block *sblock = spage->sblock; |
a2de733c | 2052 | struct scrub_bio *sbio; |
69f4cb52 | 2053 | int ret; |
a2de733c AJ |
2054 | |
2055 | again: | |
2056 | /* | |
2057 | * grab a fresh bio or wait for one to become available | |
2058 | */ | |
d9d181c1 SB |
2059 | while (sctx->curr == -1) { |
2060 | spin_lock(&sctx->list_lock); | |
2061 | sctx->curr = sctx->first_free; | |
2062 | if (sctx->curr != -1) { | |
2063 | sctx->first_free = sctx->bios[sctx->curr]->next_free; | |
2064 | sctx->bios[sctx->curr]->next_free = -1; | |
2065 | sctx->bios[sctx->curr]->page_count = 0; | |
2066 | spin_unlock(&sctx->list_lock); | |
a2de733c | 2067 | } else { |
d9d181c1 SB |
2068 | spin_unlock(&sctx->list_lock); |
2069 | wait_event(sctx->list_wait, sctx->first_free != -1); | |
a2de733c AJ |
2070 | } |
2071 | } | |
d9d181c1 | 2072 | sbio = sctx->bios[sctx->curr]; |
b5d67f64 | 2073 | if (sbio->page_count == 0) { |
69f4cb52 AJ |
2074 | struct bio *bio; |
2075 | ||
b5d67f64 SB |
2076 | sbio->physical = spage->physical; |
2077 | sbio->logical = spage->logical; | |
a36cf8b8 | 2078 | sbio->dev = spage->dev; |
b5d67f64 SB |
2079 | bio = sbio->bio; |
2080 | if (!bio) { | |
9be3395b | 2081 | bio = btrfs_io_bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio); |
b5d67f64 SB |
2082 | if (!bio) |
2083 | return -ENOMEM; | |
2084 | sbio->bio = bio; | |
2085 | } | |
69f4cb52 AJ |
2086 | |
2087 | bio->bi_private = sbio; | |
2088 | bio->bi_end_io = scrub_bio_end_io; | |
a36cf8b8 | 2089 | bio->bi_bdev = sbio->dev->bdev; |
4f024f37 | 2090 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
69f4cb52 | 2091 | sbio->err = 0; |
b5d67f64 SB |
2092 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
2093 | spage->physical || | |
2094 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
a36cf8b8 SB |
2095 | spage->logical || |
2096 | sbio->dev != spage->dev) { | |
d9d181c1 | 2097 | scrub_submit(sctx); |
a2de733c AJ |
2098 | goto again; |
2099 | } | |
69f4cb52 | 2100 | |
b5d67f64 SB |
2101 | sbio->pagev[sbio->page_count] = spage; |
2102 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
2103 | if (ret != PAGE_SIZE) { | |
2104 | if (sbio->page_count < 1) { | |
2105 | bio_put(sbio->bio); | |
2106 | sbio->bio = NULL; | |
2107 | return -EIO; | |
2108 | } | |
d9d181c1 | 2109 | scrub_submit(sctx); |
69f4cb52 AJ |
2110 | goto again; |
2111 | } | |
2112 | ||
ff023aac | 2113 | scrub_block_get(sblock); /* one for the page added to the bio */ |
b5d67f64 SB |
2114 | atomic_inc(&sblock->outstanding_pages); |
2115 | sbio->page_count++; | |
ff023aac | 2116 | if (sbio->page_count == sctx->pages_per_rd_bio) |
d9d181c1 | 2117 | scrub_submit(sctx); |
b5d67f64 SB |
2118 | |
2119 | return 0; | |
2120 | } | |
2121 | ||
22365979 | 2122 | static void scrub_missing_raid56_end_io(struct bio *bio) |
73ff61db OS |
2123 | { |
2124 | struct scrub_block *sblock = bio->bi_private; | |
2125 | struct btrfs_fs_info *fs_info = sblock->sctx->dev_root->fs_info; | |
2126 | ||
22365979 | 2127 | if (bio->bi_error) |
73ff61db OS |
2128 | sblock->no_io_error_seen = 0; |
2129 | ||
2130 | btrfs_queue_work(fs_info->scrub_workers, &sblock->work); | |
2131 | } | |
2132 | ||
2133 | static void scrub_missing_raid56_worker(struct btrfs_work *work) | |
2134 | { | |
2135 | struct scrub_block *sblock = container_of(work, struct scrub_block, work); | |
2136 | struct scrub_ctx *sctx = sblock->sctx; | |
73ff61db OS |
2137 | u64 logical; |
2138 | struct btrfs_device *dev; | |
2139 | ||
73ff61db OS |
2140 | logical = sblock->pagev[0]->logical; |
2141 | dev = sblock->pagev[0]->dev; | |
2142 | ||
affe4a5a | 2143 | if (sblock->no_io_error_seen) |
ba7cf988 | 2144 | scrub_recheck_block_checksum(sblock); |
73ff61db OS |
2145 | |
2146 | if (!sblock->no_io_error_seen) { | |
2147 | spin_lock(&sctx->stat_lock); | |
2148 | sctx->stat.read_errors++; | |
2149 | spin_unlock(&sctx->stat_lock); | |
ba7cf988 | 2150 | btrfs_err_rl_in_rcu(sctx->dev_root->fs_info, |
b14af3b4 | 2151 | "IO error rebuilding logical %llu for dev %s", |
73ff61db OS |
2152 | logical, rcu_str_deref(dev->name)); |
2153 | } else if (sblock->header_error || sblock->checksum_error) { | |
2154 | spin_lock(&sctx->stat_lock); | |
2155 | sctx->stat.uncorrectable_errors++; | |
2156 | spin_unlock(&sctx->stat_lock); | |
ba7cf988 | 2157 | btrfs_err_rl_in_rcu(sctx->dev_root->fs_info, |
b14af3b4 | 2158 | "failed to rebuild valid logical %llu for dev %s", |
73ff61db OS |
2159 | logical, rcu_str_deref(dev->name)); |
2160 | } else { | |
2161 | scrub_write_block_to_dev_replace(sblock); | |
2162 | } | |
2163 | ||
2164 | scrub_block_put(sblock); | |
2165 | ||
2166 | if (sctx->is_dev_replace && | |
2167 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { | |
2168 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2169 | scrub_wr_submit(sctx); | |
2170 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2171 | } | |
2172 | ||
2173 | scrub_pending_bio_dec(sctx); | |
2174 | } | |
2175 | ||
2176 | static void scrub_missing_raid56_pages(struct scrub_block *sblock) | |
2177 | { | |
2178 | struct scrub_ctx *sctx = sblock->sctx; | |
2179 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
2180 | u64 length = sblock->page_count * PAGE_SIZE; | |
2181 | u64 logical = sblock->pagev[0]->logical; | |
2182 | struct btrfs_bio *bbio; | |
2183 | struct bio *bio; | |
2184 | struct btrfs_raid_bio *rbio; | |
2185 | int ret; | |
2186 | int i; | |
2187 | ||
2188 | ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical, &length, | |
2189 | &bbio, 0, 1); | |
2190 | if (ret || !bbio || !bbio->raid_map) | |
2191 | goto bbio_out; | |
2192 | ||
2193 | if (WARN_ON(!sctx->is_dev_replace || | |
2194 | !(bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK))) { | |
2195 | /* | |
2196 | * We shouldn't be scrubbing a missing device. Even for dev | |
2197 | * replace, we should only get here for RAID 5/6. We either | |
2198 | * managed to mount something with no mirrors remaining or | |
2199 | * there's a bug in scrub_remap_extent()/btrfs_map_block(). | |
2200 | */ | |
2201 | goto bbio_out; | |
2202 | } | |
2203 | ||
2204 | bio = btrfs_io_bio_alloc(GFP_NOFS, 0); | |
2205 | if (!bio) | |
2206 | goto bbio_out; | |
2207 | ||
2208 | bio->bi_iter.bi_sector = logical >> 9; | |
2209 | bio->bi_private = sblock; | |
2210 | bio->bi_end_io = scrub_missing_raid56_end_io; | |
2211 | ||
2212 | rbio = raid56_alloc_missing_rbio(sctx->dev_root, bio, bbio, length); | |
2213 | if (!rbio) | |
2214 | goto rbio_out; | |
2215 | ||
2216 | for (i = 0; i < sblock->page_count; i++) { | |
2217 | struct scrub_page *spage = sblock->pagev[i]; | |
2218 | ||
2219 | raid56_add_scrub_pages(rbio, spage->page, spage->logical); | |
2220 | } | |
2221 | ||
2222 | btrfs_init_work(&sblock->work, btrfs_scrub_helper, | |
2223 | scrub_missing_raid56_worker, NULL, NULL); | |
2224 | scrub_block_get(sblock); | |
2225 | scrub_pending_bio_inc(sctx); | |
2226 | raid56_submit_missing_rbio(rbio); | |
2227 | return; | |
2228 | ||
2229 | rbio_out: | |
2230 | bio_put(bio); | |
2231 | bbio_out: | |
2232 | btrfs_put_bbio(bbio); | |
2233 | spin_lock(&sctx->stat_lock); | |
2234 | sctx->stat.malloc_errors++; | |
2235 | spin_unlock(&sctx->stat_lock); | |
2236 | } | |
2237 | ||
d9d181c1 | 2238 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2239 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
2240 | u64 gen, int mirror_num, u8 *csum, int force, |
2241 | u64 physical_for_dev_replace) | |
b5d67f64 SB |
2242 | { |
2243 | struct scrub_block *sblock; | |
2244 | int index; | |
2245 | ||
2246 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
2247 | if (!sblock) { | |
d9d181c1 SB |
2248 | spin_lock(&sctx->stat_lock); |
2249 | sctx->stat.malloc_errors++; | |
2250 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2251 | return -ENOMEM; |
a2de733c | 2252 | } |
b5d67f64 | 2253 | |
7a9e9987 SB |
2254 | /* one ref inside this function, plus one for each page added to |
2255 | * a bio later on */ | |
57019345 | 2256 | atomic_set(&sblock->refs, 1); |
d9d181c1 | 2257 | sblock->sctx = sctx; |
b5d67f64 SB |
2258 | sblock->no_io_error_seen = 1; |
2259 | ||
2260 | for (index = 0; len > 0; index++) { | |
7a9e9987 | 2261 | struct scrub_page *spage; |
b5d67f64 SB |
2262 | u64 l = min_t(u64, len, PAGE_SIZE); |
2263 | ||
7a9e9987 SB |
2264 | spage = kzalloc(sizeof(*spage), GFP_NOFS); |
2265 | if (!spage) { | |
2266 | leave_nomem: | |
d9d181c1 SB |
2267 | spin_lock(&sctx->stat_lock); |
2268 | sctx->stat.malloc_errors++; | |
2269 | spin_unlock(&sctx->stat_lock); | |
7a9e9987 | 2270 | scrub_block_put(sblock); |
b5d67f64 SB |
2271 | return -ENOMEM; |
2272 | } | |
7a9e9987 SB |
2273 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
2274 | scrub_page_get(spage); | |
2275 | sblock->pagev[index] = spage; | |
b5d67f64 | 2276 | spage->sblock = sblock; |
a36cf8b8 | 2277 | spage->dev = dev; |
b5d67f64 SB |
2278 | spage->flags = flags; |
2279 | spage->generation = gen; | |
2280 | spage->logical = logical; | |
2281 | spage->physical = physical; | |
ff023aac | 2282 | spage->physical_for_dev_replace = physical_for_dev_replace; |
b5d67f64 SB |
2283 | spage->mirror_num = mirror_num; |
2284 | if (csum) { | |
2285 | spage->have_csum = 1; | |
d9d181c1 | 2286 | memcpy(spage->csum, csum, sctx->csum_size); |
b5d67f64 SB |
2287 | } else { |
2288 | spage->have_csum = 0; | |
2289 | } | |
2290 | sblock->page_count++; | |
7a9e9987 SB |
2291 | spage->page = alloc_page(GFP_NOFS); |
2292 | if (!spage->page) | |
2293 | goto leave_nomem; | |
b5d67f64 SB |
2294 | len -= l; |
2295 | logical += l; | |
2296 | physical += l; | |
ff023aac | 2297 | physical_for_dev_replace += l; |
b5d67f64 SB |
2298 | } |
2299 | ||
7a9e9987 | 2300 | WARN_ON(sblock->page_count == 0); |
73ff61db OS |
2301 | if (dev->missing) { |
2302 | /* | |
2303 | * This case should only be hit for RAID 5/6 device replace. See | |
2304 | * the comment in scrub_missing_raid56_pages() for details. | |
2305 | */ | |
2306 | scrub_missing_raid56_pages(sblock); | |
2307 | } else { | |
2308 | for (index = 0; index < sblock->page_count; index++) { | |
2309 | struct scrub_page *spage = sblock->pagev[index]; | |
2310 | int ret; | |
1bc87793 | 2311 | |
73ff61db OS |
2312 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
2313 | if (ret) { | |
2314 | scrub_block_put(sblock); | |
2315 | return ret; | |
2316 | } | |
b5d67f64 | 2317 | } |
a2de733c | 2318 | |
73ff61db OS |
2319 | if (force) |
2320 | scrub_submit(sctx); | |
2321 | } | |
a2de733c | 2322 | |
b5d67f64 SB |
2323 | /* last one frees, either here or in bio completion for last page */ |
2324 | scrub_block_put(sblock); | |
a2de733c AJ |
2325 | return 0; |
2326 | } | |
2327 | ||
4246a0b6 | 2328 | static void scrub_bio_end_io(struct bio *bio) |
b5d67f64 SB |
2329 | { |
2330 | struct scrub_bio *sbio = bio->bi_private; | |
a36cf8b8 | 2331 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
b5d67f64 | 2332 | |
4246a0b6 | 2333 | sbio->err = bio->bi_error; |
b5d67f64 SB |
2334 | sbio->bio = bio; |
2335 | ||
0339ef2f | 2336 | btrfs_queue_work(fs_info->scrub_workers, &sbio->work); |
b5d67f64 SB |
2337 | } |
2338 | ||
2339 | static void scrub_bio_end_io_worker(struct btrfs_work *work) | |
2340 | { | |
2341 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
d9d181c1 | 2342 | struct scrub_ctx *sctx = sbio->sctx; |
b5d67f64 SB |
2343 | int i; |
2344 | ||
ff023aac | 2345 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
2346 | if (sbio->err) { |
2347 | for (i = 0; i < sbio->page_count; i++) { | |
2348 | struct scrub_page *spage = sbio->pagev[i]; | |
2349 | ||
2350 | spage->io_error = 1; | |
2351 | spage->sblock->no_io_error_seen = 0; | |
2352 | } | |
2353 | } | |
2354 | ||
2355 | /* now complete the scrub_block items that have all pages completed */ | |
2356 | for (i = 0; i < sbio->page_count; i++) { | |
2357 | struct scrub_page *spage = sbio->pagev[i]; | |
2358 | struct scrub_block *sblock = spage->sblock; | |
2359 | ||
2360 | if (atomic_dec_and_test(&sblock->outstanding_pages)) | |
2361 | scrub_block_complete(sblock); | |
2362 | scrub_block_put(sblock); | |
2363 | } | |
2364 | ||
b5d67f64 SB |
2365 | bio_put(sbio->bio); |
2366 | sbio->bio = NULL; | |
d9d181c1 SB |
2367 | spin_lock(&sctx->list_lock); |
2368 | sbio->next_free = sctx->first_free; | |
2369 | sctx->first_free = sbio->index; | |
2370 | spin_unlock(&sctx->list_lock); | |
ff023aac SB |
2371 | |
2372 | if (sctx->is_dev_replace && | |
2373 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { | |
2374 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2375 | scrub_wr_submit(sctx); | |
2376 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2377 | } | |
2378 | ||
b6bfebc1 | 2379 | scrub_pending_bio_dec(sctx); |
b5d67f64 SB |
2380 | } |
2381 | ||
5a6ac9ea MX |
2382 | static inline void __scrub_mark_bitmap(struct scrub_parity *sparity, |
2383 | unsigned long *bitmap, | |
2384 | u64 start, u64 len) | |
2385 | { | |
9d644a62 | 2386 | u32 offset; |
5a6ac9ea MX |
2387 | int nsectors; |
2388 | int sectorsize = sparity->sctx->dev_root->sectorsize; | |
2389 | ||
2390 | if (len >= sparity->stripe_len) { | |
2391 | bitmap_set(bitmap, 0, sparity->nsectors); | |
2392 | return; | |
2393 | } | |
2394 | ||
2395 | start -= sparity->logic_start; | |
47c5713f | 2396 | start = div_u64_rem(start, sparity->stripe_len, &offset); |
5a6ac9ea MX |
2397 | offset /= sectorsize; |
2398 | nsectors = (int)len / sectorsize; | |
2399 | ||
2400 | if (offset + nsectors <= sparity->nsectors) { | |
2401 | bitmap_set(bitmap, offset, nsectors); | |
2402 | return; | |
2403 | } | |
2404 | ||
2405 | bitmap_set(bitmap, offset, sparity->nsectors - offset); | |
2406 | bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset)); | |
2407 | } | |
2408 | ||
2409 | static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity, | |
2410 | u64 start, u64 len) | |
2411 | { | |
2412 | __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len); | |
2413 | } | |
2414 | ||
2415 | static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity, | |
2416 | u64 start, u64 len) | |
2417 | { | |
2418 | __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len); | |
2419 | } | |
2420 | ||
b5d67f64 SB |
2421 | static void scrub_block_complete(struct scrub_block *sblock) |
2422 | { | |
5a6ac9ea MX |
2423 | int corrupted = 0; |
2424 | ||
ff023aac | 2425 | if (!sblock->no_io_error_seen) { |
5a6ac9ea | 2426 | corrupted = 1; |
b5d67f64 | 2427 | scrub_handle_errored_block(sblock); |
ff023aac SB |
2428 | } else { |
2429 | /* | |
2430 | * if has checksum error, write via repair mechanism in | |
2431 | * dev replace case, otherwise write here in dev replace | |
2432 | * case. | |
2433 | */ | |
5a6ac9ea MX |
2434 | corrupted = scrub_checksum(sblock); |
2435 | if (!corrupted && sblock->sctx->is_dev_replace) | |
ff023aac SB |
2436 | scrub_write_block_to_dev_replace(sblock); |
2437 | } | |
5a6ac9ea MX |
2438 | |
2439 | if (sblock->sparity && corrupted && !sblock->data_corrected) { | |
2440 | u64 start = sblock->pagev[0]->logical; | |
2441 | u64 end = sblock->pagev[sblock->page_count - 1]->logical + | |
2442 | PAGE_SIZE; | |
2443 | ||
2444 | scrub_parity_mark_sectors_error(sblock->sparity, | |
2445 | start, end - start); | |
2446 | } | |
b5d67f64 SB |
2447 | } |
2448 | ||
3b5753ec | 2449 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u8 *csum) |
a2de733c AJ |
2450 | { |
2451 | struct btrfs_ordered_sum *sum = NULL; | |
f51a4a18 | 2452 | unsigned long index; |
a2de733c | 2453 | unsigned long num_sectors; |
a2de733c | 2454 | |
d9d181c1 SB |
2455 | while (!list_empty(&sctx->csum_list)) { |
2456 | sum = list_first_entry(&sctx->csum_list, | |
a2de733c AJ |
2457 | struct btrfs_ordered_sum, list); |
2458 | if (sum->bytenr > logical) | |
2459 | return 0; | |
2460 | if (sum->bytenr + sum->len > logical) | |
2461 | break; | |
2462 | ||
d9d181c1 | 2463 | ++sctx->stat.csum_discards; |
a2de733c AJ |
2464 | list_del(&sum->list); |
2465 | kfree(sum); | |
2466 | sum = NULL; | |
2467 | } | |
2468 | if (!sum) | |
2469 | return 0; | |
2470 | ||
f51a4a18 | 2471 | index = ((u32)(logical - sum->bytenr)) / sctx->sectorsize; |
d9d181c1 | 2472 | num_sectors = sum->len / sctx->sectorsize; |
f51a4a18 MX |
2473 | memcpy(csum, sum->sums + index, sctx->csum_size); |
2474 | if (index == num_sectors - 1) { | |
a2de733c AJ |
2475 | list_del(&sum->list); |
2476 | kfree(sum); | |
2477 | } | |
f51a4a18 | 2478 | return 1; |
a2de733c AJ |
2479 | } |
2480 | ||
2481 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
d9d181c1 | 2482 | static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2483 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac | 2484 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
a2de733c AJ |
2485 | { |
2486 | int ret; | |
2487 | u8 csum[BTRFS_CSUM_SIZE]; | |
b5d67f64 SB |
2488 | u32 blocksize; |
2489 | ||
2490 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
d9d181c1 SB |
2491 | blocksize = sctx->sectorsize; |
2492 | spin_lock(&sctx->stat_lock); | |
2493 | sctx->stat.data_extents_scrubbed++; | |
2494 | sctx->stat.data_bytes_scrubbed += len; | |
2495 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2496 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
d9d181c1 SB |
2497 | blocksize = sctx->nodesize; |
2498 | spin_lock(&sctx->stat_lock); | |
2499 | sctx->stat.tree_extents_scrubbed++; | |
2500 | sctx->stat.tree_bytes_scrubbed += len; | |
2501 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2502 | } else { |
d9d181c1 | 2503 | blocksize = sctx->sectorsize; |
ff023aac | 2504 | WARN_ON(1); |
b5d67f64 | 2505 | } |
a2de733c AJ |
2506 | |
2507 | while (len) { | |
b5d67f64 | 2508 | u64 l = min_t(u64, len, blocksize); |
a2de733c AJ |
2509 | int have_csum = 0; |
2510 | ||
2511 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2512 | /* push csums to sbio */ | |
3b5753ec | 2513 | have_csum = scrub_find_csum(sctx, logical, csum); |
a2de733c | 2514 | if (have_csum == 0) |
d9d181c1 | 2515 | ++sctx->stat.no_csum; |
ff023aac SB |
2516 | if (sctx->is_dev_replace && !have_csum) { |
2517 | ret = copy_nocow_pages(sctx, logical, l, | |
2518 | mirror_num, | |
2519 | physical_for_dev_replace); | |
2520 | goto behind_scrub_pages; | |
2521 | } | |
a2de733c | 2522 | } |
a36cf8b8 | 2523 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
ff023aac SB |
2524 | mirror_num, have_csum ? csum : NULL, 0, |
2525 | physical_for_dev_replace); | |
2526 | behind_scrub_pages: | |
a2de733c AJ |
2527 | if (ret) |
2528 | return ret; | |
2529 | len -= l; | |
2530 | logical += l; | |
2531 | physical += l; | |
ff023aac | 2532 | physical_for_dev_replace += l; |
a2de733c AJ |
2533 | } |
2534 | return 0; | |
2535 | } | |
2536 | ||
5a6ac9ea MX |
2537 | static int scrub_pages_for_parity(struct scrub_parity *sparity, |
2538 | u64 logical, u64 len, | |
2539 | u64 physical, struct btrfs_device *dev, | |
2540 | u64 flags, u64 gen, int mirror_num, u8 *csum) | |
2541 | { | |
2542 | struct scrub_ctx *sctx = sparity->sctx; | |
2543 | struct scrub_block *sblock; | |
2544 | int index; | |
2545 | ||
2546 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
2547 | if (!sblock) { | |
2548 | spin_lock(&sctx->stat_lock); | |
2549 | sctx->stat.malloc_errors++; | |
2550 | spin_unlock(&sctx->stat_lock); | |
2551 | return -ENOMEM; | |
2552 | } | |
2553 | ||
2554 | /* one ref inside this function, plus one for each page added to | |
2555 | * a bio later on */ | |
57019345 | 2556 | atomic_set(&sblock->refs, 1); |
5a6ac9ea MX |
2557 | sblock->sctx = sctx; |
2558 | sblock->no_io_error_seen = 1; | |
2559 | sblock->sparity = sparity; | |
2560 | scrub_parity_get(sparity); | |
2561 | ||
2562 | for (index = 0; len > 0; index++) { | |
2563 | struct scrub_page *spage; | |
2564 | u64 l = min_t(u64, len, PAGE_SIZE); | |
2565 | ||
2566 | spage = kzalloc(sizeof(*spage), GFP_NOFS); | |
2567 | if (!spage) { | |
2568 | leave_nomem: | |
2569 | spin_lock(&sctx->stat_lock); | |
2570 | sctx->stat.malloc_errors++; | |
2571 | spin_unlock(&sctx->stat_lock); | |
2572 | scrub_block_put(sblock); | |
2573 | return -ENOMEM; | |
2574 | } | |
2575 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); | |
2576 | /* For scrub block */ | |
2577 | scrub_page_get(spage); | |
2578 | sblock->pagev[index] = spage; | |
2579 | /* For scrub parity */ | |
2580 | scrub_page_get(spage); | |
2581 | list_add_tail(&spage->list, &sparity->spages); | |
2582 | spage->sblock = sblock; | |
2583 | spage->dev = dev; | |
2584 | spage->flags = flags; | |
2585 | spage->generation = gen; | |
2586 | spage->logical = logical; | |
2587 | spage->physical = physical; | |
2588 | spage->mirror_num = mirror_num; | |
2589 | if (csum) { | |
2590 | spage->have_csum = 1; | |
2591 | memcpy(spage->csum, csum, sctx->csum_size); | |
2592 | } else { | |
2593 | spage->have_csum = 0; | |
2594 | } | |
2595 | sblock->page_count++; | |
2596 | spage->page = alloc_page(GFP_NOFS); | |
2597 | if (!spage->page) | |
2598 | goto leave_nomem; | |
2599 | len -= l; | |
2600 | logical += l; | |
2601 | physical += l; | |
2602 | } | |
2603 | ||
2604 | WARN_ON(sblock->page_count == 0); | |
2605 | for (index = 0; index < sblock->page_count; index++) { | |
2606 | struct scrub_page *spage = sblock->pagev[index]; | |
2607 | int ret; | |
2608 | ||
2609 | ret = scrub_add_page_to_rd_bio(sctx, spage); | |
2610 | if (ret) { | |
2611 | scrub_block_put(sblock); | |
2612 | return ret; | |
2613 | } | |
2614 | } | |
2615 | ||
2616 | /* last one frees, either here or in bio completion for last page */ | |
2617 | scrub_block_put(sblock); | |
2618 | return 0; | |
2619 | } | |
2620 | ||
2621 | static int scrub_extent_for_parity(struct scrub_parity *sparity, | |
2622 | u64 logical, u64 len, | |
2623 | u64 physical, struct btrfs_device *dev, | |
2624 | u64 flags, u64 gen, int mirror_num) | |
2625 | { | |
2626 | struct scrub_ctx *sctx = sparity->sctx; | |
2627 | int ret; | |
2628 | u8 csum[BTRFS_CSUM_SIZE]; | |
2629 | u32 blocksize; | |
2630 | ||
4a770891 OS |
2631 | if (dev->missing) { |
2632 | scrub_parity_mark_sectors_error(sparity, logical, len); | |
2633 | return 0; | |
2634 | } | |
2635 | ||
5a6ac9ea MX |
2636 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
2637 | blocksize = sctx->sectorsize; | |
2638 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
2639 | blocksize = sctx->nodesize; | |
2640 | } else { | |
2641 | blocksize = sctx->sectorsize; | |
2642 | WARN_ON(1); | |
2643 | } | |
2644 | ||
2645 | while (len) { | |
2646 | u64 l = min_t(u64, len, blocksize); | |
2647 | int have_csum = 0; | |
2648 | ||
2649 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2650 | /* push csums to sbio */ | |
3b5753ec | 2651 | have_csum = scrub_find_csum(sctx, logical, csum); |
5a6ac9ea MX |
2652 | if (have_csum == 0) |
2653 | goto skip; | |
2654 | } | |
2655 | ret = scrub_pages_for_parity(sparity, logical, l, physical, dev, | |
2656 | flags, gen, mirror_num, | |
2657 | have_csum ? csum : NULL); | |
5a6ac9ea MX |
2658 | if (ret) |
2659 | return ret; | |
6b6d24b3 | 2660 | skip: |
5a6ac9ea MX |
2661 | len -= l; |
2662 | logical += l; | |
2663 | physical += l; | |
2664 | } | |
2665 | return 0; | |
2666 | } | |
2667 | ||
3b080b25 WS |
2668 | /* |
2669 | * Given a physical address, this will calculate it's | |
2670 | * logical offset. if this is a parity stripe, it will return | |
2671 | * the most left data stripe's logical offset. | |
2672 | * | |
2673 | * return 0 if it is a data stripe, 1 means parity stripe. | |
2674 | */ | |
2675 | static int get_raid56_logic_offset(u64 physical, int num, | |
5a6ac9ea MX |
2676 | struct map_lookup *map, u64 *offset, |
2677 | u64 *stripe_start) | |
3b080b25 WS |
2678 | { |
2679 | int i; | |
2680 | int j = 0; | |
2681 | u64 stripe_nr; | |
2682 | u64 last_offset; | |
9d644a62 DS |
2683 | u32 stripe_index; |
2684 | u32 rot; | |
3b080b25 WS |
2685 | |
2686 | last_offset = (physical - map->stripes[num].physical) * | |
2687 | nr_data_stripes(map); | |
5a6ac9ea MX |
2688 | if (stripe_start) |
2689 | *stripe_start = last_offset; | |
2690 | ||
3b080b25 WS |
2691 | *offset = last_offset; |
2692 | for (i = 0; i < nr_data_stripes(map); i++) { | |
2693 | *offset = last_offset + i * map->stripe_len; | |
2694 | ||
b8b93add DS |
2695 | stripe_nr = div_u64(*offset, map->stripe_len); |
2696 | stripe_nr = div_u64(stripe_nr, nr_data_stripes(map)); | |
3b080b25 WS |
2697 | |
2698 | /* Work out the disk rotation on this stripe-set */ | |
47c5713f | 2699 | stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot); |
3b080b25 WS |
2700 | /* calculate which stripe this data locates */ |
2701 | rot += i; | |
e4fbaee2 | 2702 | stripe_index = rot % map->num_stripes; |
3b080b25 WS |
2703 | if (stripe_index == num) |
2704 | return 0; | |
2705 | if (stripe_index < num) | |
2706 | j++; | |
2707 | } | |
2708 | *offset = last_offset + j * map->stripe_len; | |
2709 | return 1; | |
2710 | } | |
2711 | ||
5a6ac9ea MX |
2712 | static void scrub_free_parity(struct scrub_parity *sparity) |
2713 | { | |
2714 | struct scrub_ctx *sctx = sparity->sctx; | |
2715 | struct scrub_page *curr, *next; | |
2716 | int nbits; | |
2717 | ||
2718 | nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors); | |
2719 | if (nbits) { | |
2720 | spin_lock(&sctx->stat_lock); | |
2721 | sctx->stat.read_errors += nbits; | |
2722 | sctx->stat.uncorrectable_errors += nbits; | |
2723 | spin_unlock(&sctx->stat_lock); | |
2724 | } | |
2725 | ||
2726 | list_for_each_entry_safe(curr, next, &sparity->spages, list) { | |
2727 | list_del_init(&curr->list); | |
2728 | scrub_page_put(curr); | |
2729 | } | |
2730 | ||
2731 | kfree(sparity); | |
2732 | } | |
2733 | ||
20b2e302 ZL |
2734 | static void scrub_parity_bio_endio_worker(struct btrfs_work *work) |
2735 | { | |
2736 | struct scrub_parity *sparity = container_of(work, struct scrub_parity, | |
2737 | work); | |
2738 | struct scrub_ctx *sctx = sparity->sctx; | |
2739 | ||
2740 | scrub_free_parity(sparity); | |
2741 | scrub_pending_bio_dec(sctx); | |
2742 | } | |
2743 | ||
4246a0b6 | 2744 | static void scrub_parity_bio_endio(struct bio *bio) |
5a6ac9ea MX |
2745 | { |
2746 | struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private; | |
5a6ac9ea | 2747 | |
4246a0b6 | 2748 | if (bio->bi_error) |
5a6ac9ea MX |
2749 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, |
2750 | sparity->nsectors); | |
2751 | ||
5a6ac9ea | 2752 | bio_put(bio); |
20b2e302 ZL |
2753 | |
2754 | btrfs_init_work(&sparity->work, btrfs_scrubparity_helper, | |
2755 | scrub_parity_bio_endio_worker, NULL, NULL); | |
2756 | btrfs_queue_work(sparity->sctx->dev_root->fs_info->scrub_parity_workers, | |
2757 | &sparity->work); | |
5a6ac9ea MX |
2758 | } |
2759 | ||
2760 | static void scrub_parity_check_and_repair(struct scrub_parity *sparity) | |
2761 | { | |
2762 | struct scrub_ctx *sctx = sparity->sctx; | |
2763 | struct bio *bio; | |
2764 | struct btrfs_raid_bio *rbio; | |
2765 | struct scrub_page *spage; | |
2766 | struct btrfs_bio *bbio = NULL; | |
5a6ac9ea MX |
2767 | u64 length; |
2768 | int ret; | |
2769 | ||
2770 | if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap, | |
2771 | sparity->nsectors)) | |
2772 | goto out; | |
2773 | ||
a0dd59de | 2774 | length = sparity->logic_end - sparity->logic_start; |
76035976 | 2775 | ret = btrfs_map_sblock(sctx->dev_root->fs_info, WRITE, |
5a6ac9ea | 2776 | sparity->logic_start, |
8e5cfb55 ZL |
2777 | &length, &bbio, 0, 1); |
2778 | if (ret || !bbio || !bbio->raid_map) | |
5a6ac9ea MX |
2779 | goto bbio_out; |
2780 | ||
2781 | bio = btrfs_io_bio_alloc(GFP_NOFS, 0); | |
2782 | if (!bio) | |
2783 | goto bbio_out; | |
2784 | ||
2785 | bio->bi_iter.bi_sector = sparity->logic_start >> 9; | |
2786 | bio->bi_private = sparity; | |
2787 | bio->bi_end_io = scrub_parity_bio_endio; | |
2788 | ||
2789 | rbio = raid56_parity_alloc_scrub_rbio(sctx->dev_root, bio, bbio, | |
8e5cfb55 | 2790 | length, sparity->scrub_dev, |
5a6ac9ea MX |
2791 | sparity->dbitmap, |
2792 | sparity->nsectors); | |
2793 | if (!rbio) | |
2794 | goto rbio_out; | |
2795 | ||
2796 | list_for_each_entry(spage, &sparity->spages, list) | |
b4ee1782 | 2797 | raid56_add_scrub_pages(rbio, spage->page, spage->logical); |
5a6ac9ea MX |
2798 | |
2799 | scrub_pending_bio_inc(sctx); | |
2800 | raid56_parity_submit_scrub_rbio(rbio); | |
2801 | return; | |
2802 | ||
2803 | rbio_out: | |
2804 | bio_put(bio); | |
2805 | bbio_out: | |
6e9606d2 | 2806 | btrfs_put_bbio(bbio); |
5a6ac9ea MX |
2807 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, |
2808 | sparity->nsectors); | |
2809 | spin_lock(&sctx->stat_lock); | |
2810 | sctx->stat.malloc_errors++; | |
2811 | spin_unlock(&sctx->stat_lock); | |
2812 | out: | |
2813 | scrub_free_parity(sparity); | |
2814 | } | |
2815 | ||
2816 | static inline int scrub_calc_parity_bitmap_len(int nsectors) | |
2817 | { | |
2818 | return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * (BITS_PER_LONG / 8); | |
2819 | } | |
2820 | ||
2821 | static void scrub_parity_get(struct scrub_parity *sparity) | |
2822 | { | |
57019345 | 2823 | atomic_inc(&sparity->refs); |
5a6ac9ea MX |
2824 | } |
2825 | ||
2826 | static void scrub_parity_put(struct scrub_parity *sparity) | |
2827 | { | |
57019345 | 2828 | if (!atomic_dec_and_test(&sparity->refs)) |
5a6ac9ea MX |
2829 | return; |
2830 | ||
2831 | scrub_parity_check_and_repair(sparity); | |
2832 | } | |
2833 | ||
2834 | static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, | |
2835 | struct map_lookup *map, | |
2836 | struct btrfs_device *sdev, | |
2837 | struct btrfs_path *path, | |
2838 | u64 logic_start, | |
2839 | u64 logic_end) | |
2840 | { | |
2841 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
2842 | struct btrfs_root *root = fs_info->extent_root; | |
2843 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2844 | struct btrfs_extent_item *extent; | |
4a770891 | 2845 | struct btrfs_bio *bbio = NULL; |
5a6ac9ea MX |
2846 | u64 flags; |
2847 | int ret; | |
2848 | int slot; | |
2849 | struct extent_buffer *l; | |
2850 | struct btrfs_key key; | |
2851 | u64 generation; | |
2852 | u64 extent_logical; | |
2853 | u64 extent_physical; | |
2854 | u64 extent_len; | |
4a770891 | 2855 | u64 mapped_length; |
5a6ac9ea MX |
2856 | struct btrfs_device *extent_dev; |
2857 | struct scrub_parity *sparity; | |
2858 | int nsectors; | |
2859 | int bitmap_len; | |
2860 | int extent_mirror_num; | |
2861 | int stop_loop = 0; | |
2862 | ||
2863 | nsectors = map->stripe_len / root->sectorsize; | |
2864 | bitmap_len = scrub_calc_parity_bitmap_len(nsectors); | |
2865 | sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len, | |
2866 | GFP_NOFS); | |
2867 | if (!sparity) { | |
2868 | spin_lock(&sctx->stat_lock); | |
2869 | sctx->stat.malloc_errors++; | |
2870 | spin_unlock(&sctx->stat_lock); | |
2871 | return -ENOMEM; | |
2872 | } | |
2873 | ||
2874 | sparity->stripe_len = map->stripe_len; | |
2875 | sparity->nsectors = nsectors; | |
2876 | sparity->sctx = sctx; | |
2877 | sparity->scrub_dev = sdev; | |
2878 | sparity->logic_start = logic_start; | |
2879 | sparity->logic_end = logic_end; | |
57019345 | 2880 | atomic_set(&sparity->refs, 1); |
5a6ac9ea MX |
2881 | INIT_LIST_HEAD(&sparity->spages); |
2882 | sparity->dbitmap = sparity->bitmap; | |
2883 | sparity->ebitmap = (void *)sparity->bitmap + bitmap_len; | |
2884 | ||
2885 | ret = 0; | |
2886 | while (logic_start < logic_end) { | |
2887 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) | |
2888 | key.type = BTRFS_METADATA_ITEM_KEY; | |
2889 | else | |
2890 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2891 | key.objectid = logic_start; | |
2892 | key.offset = (u64)-1; | |
2893 | ||
2894 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2895 | if (ret < 0) | |
2896 | goto out; | |
2897 | ||
2898 | if (ret > 0) { | |
2899 | ret = btrfs_previous_extent_item(root, path, 0); | |
2900 | if (ret < 0) | |
2901 | goto out; | |
2902 | if (ret > 0) { | |
2903 | btrfs_release_path(path); | |
2904 | ret = btrfs_search_slot(NULL, root, &key, | |
2905 | path, 0, 0); | |
2906 | if (ret < 0) | |
2907 | goto out; | |
2908 | } | |
2909 | } | |
2910 | ||
2911 | stop_loop = 0; | |
2912 | while (1) { | |
2913 | u64 bytes; | |
2914 | ||
2915 | l = path->nodes[0]; | |
2916 | slot = path->slots[0]; | |
2917 | if (slot >= btrfs_header_nritems(l)) { | |
2918 | ret = btrfs_next_leaf(root, path); | |
2919 | if (ret == 0) | |
2920 | continue; | |
2921 | if (ret < 0) | |
2922 | goto out; | |
2923 | ||
2924 | stop_loop = 1; | |
2925 | break; | |
2926 | } | |
2927 | btrfs_item_key_to_cpu(l, &key, slot); | |
2928 | ||
d7cad238 ZL |
2929 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
2930 | key.type != BTRFS_METADATA_ITEM_KEY) | |
2931 | goto next; | |
2932 | ||
5a6ac9ea MX |
2933 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
2934 | bytes = root->nodesize; | |
2935 | else | |
2936 | bytes = key.offset; | |
2937 | ||
2938 | if (key.objectid + bytes <= logic_start) | |
2939 | goto next; | |
2940 | ||
a0dd59de | 2941 | if (key.objectid >= logic_end) { |
5a6ac9ea MX |
2942 | stop_loop = 1; |
2943 | break; | |
2944 | } | |
2945 | ||
2946 | while (key.objectid >= logic_start + map->stripe_len) | |
2947 | logic_start += map->stripe_len; | |
2948 | ||
2949 | extent = btrfs_item_ptr(l, slot, | |
2950 | struct btrfs_extent_item); | |
2951 | flags = btrfs_extent_flags(l, extent); | |
2952 | generation = btrfs_extent_generation(l, extent); | |
2953 | ||
a323e813 ZL |
2954 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && |
2955 | (key.objectid < logic_start || | |
2956 | key.objectid + bytes > | |
2957 | logic_start + map->stripe_len)) { | |
2958 | btrfs_err(fs_info, "scrub: tree block %llu spanning stripes, ignored. logical=%llu", | |
2959 | key.objectid, logic_start); | |
9799d2c3 ZL |
2960 | spin_lock(&sctx->stat_lock); |
2961 | sctx->stat.uncorrectable_errors++; | |
2962 | spin_unlock(&sctx->stat_lock); | |
5a6ac9ea MX |
2963 | goto next; |
2964 | } | |
2965 | again: | |
2966 | extent_logical = key.objectid; | |
2967 | extent_len = bytes; | |
2968 | ||
2969 | if (extent_logical < logic_start) { | |
2970 | extent_len -= logic_start - extent_logical; | |
2971 | extent_logical = logic_start; | |
2972 | } | |
2973 | ||
2974 | if (extent_logical + extent_len > | |
2975 | logic_start + map->stripe_len) | |
2976 | extent_len = logic_start + map->stripe_len - | |
2977 | extent_logical; | |
2978 | ||
2979 | scrub_parity_mark_sectors_data(sparity, extent_logical, | |
2980 | extent_len); | |
2981 | ||
4a770891 OS |
2982 | mapped_length = extent_len; |
2983 | ret = btrfs_map_block(fs_info, READ, extent_logical, | |
2984 | &mapped_length, &bbio, 0); | |
2985 | if (!ret) { | |
2986 | if (!bbio || mapped_length < extent_len) | |
2987 | ret = -EIO; | |
2988 | } | |
2989 | if (ret) { | |
2990 | btrfs_put_bbio(bbio); | |
2991 | goto out; | |
2992 | } | |
2993 | extent_physical = bbio->stripes[0].physical; | |
2994 | extent_mirror_num = bbio->mirror_num; | |
2995 | extent_dev = bbio->stripes[0].dev; | |
2996 | btrfs_put_bbio(bbio); | |
5a6ac9ea MX |
2997 | |
2998 | ret = btrfs_lookup_csums_range(csum_root, | |
2999 | extent_logical, | |
3000 | extent_logical + extent_len - 1, | |
3001 | &sctx->csum_list, 1); | |
3002 | if (ret) | |
3003 | goto out; | |
3004 | ||
3005 | ret = scrub_extent_for_parity(sparity, extent_logical, | |
3006 | extent_len, | |
3007 | extent_physical, | |
3008 | extent_dev, flags, | |
3009 | generation, | |
3010 | extent_mirror_num); | |
6fa96d72 ZL |
3011 | |
3012 | scrub_free_csums(sctx); | |
3013 | ||
5a6ac9ea MX |
3014 | if (ret) |
3015 | goto out; | |
3016 | ||
5a6ac9ea MX |
3017 | if (extent_logical + extent_len < |
3018 | key.objectid + bytes) { | |
3019 | logic_start += map->stripe_len; | |
3020 | ||
3021 | if (logic_start >= logic_end) { | |
3022 | stop_loop = 1; | |
3023 | break; | |
3024 | } | |
3025 | ||
3026 | if (logic_start < key.objectid + bytes) { | |
3027 | cond_resched(); | |
3028 | goto again; | |
3029 | } | |
3030 | } | |
3031 | next: | |
3032 | path->slots[0]++; | |
3033 | } | |
3034 | ||
3035 | btrfs_release_path(path); | |
3036 | ||
3037 | if (stop_loop) | |
3038 | break; | |
3039 | ||
3040 | logic_start += map->stripe_len; | |
3041 | } | |
3042 | out: | |
3043 | if (ret < 0) | |
3044 | scrub_parity_mark_sectors_error(sparity, logic_start, | |
a0dd59de | 3045 | logic_end - logic_start); |
5a6ac9ea MX |
3046 | scrub_parity_put(sparity); |
3047 | scrub_submit(sctx); | |
3048 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
3049 | scrub_wr_submit(sctx); | |
3050 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
3051 | ||
3052 | btrfs_release_path(path); | |
3053 | return ret < 0 ? ret : 0; | |
3054 | } | |
3055 | ||
d9d181c1 | 3056 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
a36cf8b8 SB |
3057 | struct map_lookup *map, |
3058 | struct btrfs_device *scrub_dev, | |
ff023aac SB |
3059 | int num, u64 base, u64 length, |
3060 | int is_dev_replace) | |
a2de733c | 3061 | { |
5a6ac9ea | 3062 | struct btrfs_path *path, *ppath; |
a36cf8b8 | 3063 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
a2de733c AJ |
3064 | struct btrfs_root *root = fs_info->extent_root; |
3065 | struct btrfs_root *csum_root = fs_info->csum_root; | |
3066 | struct btrfs_extent_item *extent; | |
e7786c3a | 3067 | struct blk_plug plug; |
a2de733c AJ |
3068 | u64 flags; |
3069 | int ret; | |
3070 | int slot; | |
a2de733c | 3071 | u64 nstripes; |
a2de733c AJ |
3072 | struct extent_buffer *l; |
3073 | struct btrfs_key key; | |
3074 | u64 physical; | |
3075 | u64 logical; | |
625f1c8d | 3076 | u64 logic_end; |
3b080b25 | 3077 | u64 physical_end; |
a2de733c | 3078 | u64 generation; |
e12fa9cd | 3079 | int mirror_num; |
7a26285e AJ |
3080 | struct reada_control *reada1; |
3081 | struct reada_control *reada2; | |
3082 | struct btrfs_key key_start; | |
3083 | struct btrfs_key key_end; | |
a2de733c AJ |
3084 | u64 increment = map->stripe_len; |
3085 | u64 offset; | |
ff023aac SB |
3086 | u64 extent_logical; |
3087 | u64 extent_physical; | |
3088 | u64 extent_len; | |
5a6ac9ea MX |
3089 | u64 stripe_logical; |
3090 | u64 stripe_end; | |
ff023aac SB |
3091 | struct btrfs_device *extent_dev; |
3092 | int extent_mirror_num; | |
3b080b25 | 3093 | int stop_loop = 0; |
53b381b3 | 3094 | |
3b080b25 | 3095 | physical = map->stripes[num].physical; |
a2de733c | 3096 | offset = 0; |
b8b93add | 3097 | nstripes = div_u64(length, map->stripe_len); |
a2de733c AJ |
3098 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
3099 | offset = map->stripe_len * num; | |
3100 | increment = map->stripe_len * map->num_stripes; | |
193ea74b | 3101 | mirror_num = 1; |
a2de733c AJ |
3102 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
3103 | int factor = map->num_stripes / map->sub_stripes; | |
3104 | offset = map->stripe_len * (num / map->sub_stripes); | |
3105 | increment = map->stripe_len * factor; | |
193ea74b | 3106 | mirror_num = num % map->sub_stripes + 1; |
a2de733c AJ |
3107 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
3108 | increment = map->stripe_len; | |
193ea74b | 3109 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
3110 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
3111 | increment = map->stripe_len; | |
193ea74b | 3112 | mirror_num = num % map->num_stripes + 1; |
ffe2d203 | 3113 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
5a6ac9ea | 3114 | get_raid56_logic_offset(physical, num, map, &offset, NULL); |
3b080b25 WS |
3115 | increment = map->stripe_len * nr_data_stripes(map); |
3116 | mirror_num = 1; | |
a2de733c AJ |
3117 | } else { |
3118 | increment = map->stripe_len; | |
193ea74b | 3119 | mirror_num = 1; |
a2de733c AJ |
3120 | } |
3121 | ||
3122 | path = btrfs_alloc_path(); | |
3123 | if (!path) | |
3124 | return -ENOMEM; | |
3125 | ||
5a6ac9ea MX |
3126 | ppath = btrfs_alloc_path(); |
3127 | if (!ppath) { | |
379d6854 | 3128 | btrfs_free_path(path); |
5a6ac9ea MX |
3129 | return -ENOMEM; |
3130 | } | |
3131 | ||
b5d67f64 SB |
3132 | /* |
3133 | * work on commit root. The related disk blocks are static as | |
3134 | * long as COW is applied. This means, it is save to rewrite | |
3135 | * them to repair disk errors without any race conditions | |
3136 | */ | |
a2de733c AJ |
3137 | path->search_commit_root = 1; |
3138 | path->skip_locking = 1; | |
3139 | ||
063c54dc GH |
3140 | ppath->search_commit_root = 1; |
3141 | ppath->skip_locking = 1; | |
a2de733c | 3142 | /* |
7a26285e AJ |
3143 | * trigger the readahead for extent tree csum tree and wait for |
3144 | * completion. During readahead, the scrub is officially paused | |
3145 | * to not hold off transaction commits | |
a2de733c AJ |
3146 | */ |
3147 | logical = base + offset; | |
3b080b25 | 3148 | physical_end = physical + nstripes * map->stripe_len; |
ffe2d203 | 3149 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3b080b25 | 3150 | get_raid56_logic_offset(physical_end, num, |
5a6ac9ea | 3151 | map, &logic_end, NULL); |
3b080b25 WS |
3152 | logic_end += base; |
3153 | } else { | |
3154 | logic_end = logical + increment * nstripes; | |
3155 | } | |
d9d181c1 | 3156 | wait_event(sctx->list_wait, |
b6bfebc1 | 3157 | atomic_read(&sctx->bios_in_flight) == 0); |
cb7ab021 | 3158 | scrub_blocked_if_needed(fs_info); |
7a26285e AJ |
3159 | |
3160 | /* FIXME it might be better to start readahead at commit root */ | |
3161 | key_start.objectid = logical; | |
3162 | key_start.type = BTRFS_EXTENT_ITEM_KEY; | |
3163 | key_start.offset = (u64)0; | |
3b080b25 | 3164 | key_end.objectid = logic_end; |
3173a18f JB |
3165 | key_end.type = BTRFS_METADATA_ITEM_KEY; |
3166 | key_end.offset = (u64)-1; | |
7a26285e AJ |
3167 | reada1 = btrfs_reada_add(root, &key_start, &key_end); |
3168 | ||
3169 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
3170 | key_start.type = BTRFS_EXTENT_CSUM_KEY; | |
3171 | key_start.offset = logical; | |
3172 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
3173 | key_end.type = BTRFS_EXTENT_CSUM_KEY; | |
3b080b25 | 3174 | key_end.offset = logic_end; |
7a26285e AJ |
3175 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); |
3176 | ||
3177 | if (!IS_ERR(reada1)) | |
3178 | btrfs_reada_wait(reada1); | |
3179 | if (!IS_ERR(reada2)) | |
3180 | btrfs_reada_wait(reada2); | |
3181 | ||
a2de733c AJ |
3182 | |
3183 | /* | |
3184 | * collect all data csums for the stripe to avoid seeking during | |
3185 | * the scrub. This might currently (crc32) end up to be about 1MB | |
3186 | */ | |
e7786c3a | 3187 | blk_start_plug(&plug); |
a2de733c | 3188 | |
a2de733c AJ |
3189 | /* |
3190 | * now find all extents for each stripe and scrub them | |
3191 | */ | |
a2de733c | 3192 | ret = 0; |
3b080b25 | 3193 | while (physical < physical_end) { |
a2de733c AJ |
3194 | /* |
3195 | * canceled? | |
3196 | */ | |
3197 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
d9d181c1 | 3198 | atomic_read(&sctx->cancel_req)) { |
a2de733c AJ |
3199 | ret = -ECANCELED; |
3200 | goto out; | |
3201 | } | |
3202 | /* | |
3203 | * check to see if we have to pause | |
3204 | */ | |
3205 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
3206 | /* push queued extents */ | |
ff023aac | 3207 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
d9d181c1 | 3208 | scrub_submit(sctx); |
ff023aac SB |
3209 | mutex_lock(&sctx->wr_ctx.wr_lock); |
3210 | scrub_wr_submit(sctx); | |
3211 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
d9d181c1 | 3212 | wait_event(sctx->list_wait, |
b6bfebc1 | 3213 | atomic_read(&sctx->bios_in_flight) == 0); |
ff023aac | 3214 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
3cb0929a | 3215 | scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3216 | } |
3217 | ||
f2f66a2f ZL |
3218 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3219 | ret = get_raid56_logic_offset(physical, num, map, | |
3220 | &logical, | |
3221 | &stripe_logical); | |
3222 | logical += base; | |
3223 | if (ret) { | |
7955323b | 3224 | /* it is parity strip */ |
f2f66a2f | 3225 | stripe_logical += base; |
a0dd59de | 3226 | stripe_end = stripe_logical + increment; |
f2f66a2f ZL |
3227 | ret = scrub_raid56_parity(sctx, map, scrub_dev, |
3228 | ppath, stripe_logical, | |
3229 | stripe_end); | |
3230 | if (ret) | |
3231 | goto out; | |
3232 | goto skip; | |
3233 | } | |
3234 | } | |
3235 | ||
7c76edb7 WS |
3236 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
3237 | key.type = BTRFS_METADATA_ITEM_KEY; | |
3238 | else | |
3239 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
a2de733c | 3240 | key.objectid = logical; |
625f1c8d | 3241 | key.offset = (u64)-1; |
a2de733c AJ |
3242 | |
3243 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3244 | if (ret < 0) | |
3245 | goto out; | |
3173a18f | 3246 | |
8c51032f | 3247 | if (ret > 0) { |
ade2e0b3 | 3248 | ret = btrfs_previous_extent_item(root, path, 0); |
a2de733c AJ |
3249 | if (ret < 0) |
3250 | goto out; | |
8c51032f AJ |
3251 | if (ret > 0) { |
3252 | /* there's no smaller item, so stick with the | |
3253 | * larger one */ | |
3254 | btrfs_release_path(path); | |
3255 | ret = btrfs_search_slot(NULL, root, &key, | |
3256 | path, 0, 0); | |
3257 | if (ret < 0) | |
3258 | goto out; | |
3259 | } | |
a2de733c AJ |
3260 | } |
3261 | ||
625f1c8d | 3262 | stop_loop = 0; |
a2de733c | 3263 | while (1) { |
3173a18f JB |
3264 | u64 bytes; |
3265 | ||
a2de733c AJ |
3266 | l = path->nodes[0]; |
3267 | slot = path->slots[0]; | |
3268 | if (slot >= btrfs_header_nritems(l)) { | |
3269 | ret = btrfs_next_leaf(root, path); | |
3270 | if (ret == 0) | |
3271 | continue; | |
3272 | if (ret < 0) | |
3273 | goto out; | |
3274 | ||
625f1c8d | 3275 | stop_loop = 1; |
a2de733c AJ |
3276 | break; |
3277 | } | |
3278 | btrfs_item_key_to_cpu(l, &key, slot); | |
3279 | ||
d7cad238 ZL |
3280 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
3281 | key.type != BTRFS_METADATA_ITEM_KEY) | |
3282 | goto next; | |
3283 | ||
3173a18f | 3284 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
707e8a07 | 3285 | bytes = root->nodesize; |
3173a18f JB |
3286 | else |
3287 | bytes = key.offset; | |
3288 | ||
3289 | if (key.objectid + bytes <= logical) | |
a2de733c AJ |
3290 | goto next; |
3291 | ||
625f1c8d LB |
3292 | if (key.objectid >= logical + map->stripe_len) { |
3293 | /* out of this device extent */ | |
3294 | if (key.objectid >= logic_end) | |
3295 | stop_loop = 1; | |
3296 | break; | |
3297 | } | |
a2de733c AJ |
3298 | |
3299 | extent = btrfs_item_ptr(l, slot, | |
3300 | struct btrfs_extent_item); | |
3301 | flags = btrfs_extent_flags(l, extent); | |
3302 | generation = btrfs_extent_generation(l, extent); | |
3303 | ||
a323e813 ZL |
3304 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && |
3305 | (key.objectid < logical || | |
3306 | key.objectid + bytes > | |
3307 | logical + map->stripe_len)) { | |
efe120a0 FH |
3308 | btrfs_err(fs_info, |
3309 | "scrub: tree block %llu spanning " | |
3310 | "stripes, ignored. logical=%llu", | |
c1c9ff7c | 3311 | key.objectid, logical); |
9799d2c3 ZL |
3312 | spin_lock(&sctx->stat_lock); |
3313 | sctx->stat.uncorrectable_errors++; | |
3314 | spin_unlock(&sctx->stat_lock); | |
a2de733c AJ |
3315 | goto next; |
3316 | } | |
3317 | ||
625f1c8d LB |
3318 | again: |
3319 | extent_logical = key.objectid; | |
3320 | extent_len = bytes; | |
3321 | ||
a2de733c AJ |
3322 | /* |
3323 | * trim extent to this stripe | |
3324 | */ | |
625f1c8d LB |
3325 | if (extent_logical < logical) { |
3326 | extent_len -= logical - extent_logical; | |
3327 | extent_logical = logical; | |
a2de733c | 3328 | } |
625f1c8d | 3329 | if (extent_logical + extent_len > |
a2de733c | 3330 | logical + map->stripe_len) { |
625f1c8d LB |
3331 | extent_len = logical + map->stripe_len - |
3332 | extent_logical; | |
a2de733c AJ |
3333 | } |
3334 | ||
625f1c8d | 3335 | extent_physical = extent_logical - logical + physical; |
ff023aac SB |
3336 | extent_dev = scrub_dev; |
3337 | extent_mirror_num = mirror_num; | |
3338 | if (is_dev_replace) | |
3339 | scrub_remap_extent(fs_info, extent_logical, | |
3340 | extent_len, &extent_physical, | |
3341 | &extent_dev, | |
3342 | &extent_mirror_num); | |
625f1c8d | 3343 | |
fe8cf654 ZL |
3344 | ret = btrfs_lookup_csums_range(csum_root, |
3345 | extent_logical, | |
3346 | extent_logical + | |
3347 | extent_len - 1, | |
3348 | &sctx->csum_list, 1); | |
625f1c8d LB |
3349 | if (ret) |
3350 | goto out; | |
3351 | ||
ff023aac SB |
3352 | ret = scrub_extent(sctx, extent_logical, extent_len, |
3353 | extent_physical, extent_dev, flags, | |
3354 | generation, extent_mirror_num, | |
115930cb | 3355 | extent_logical - logical + physical); |
6fa96d72 ZL |
3356 | |
3357 | scrub_free_csums(sctx); | |
3358 | ||
a2de733c AJ |
3359 | if (ret) |
3360 | goto out; | |
3361 | ||
625f1c8d LB |
3362 | if (extent_logical + extent_len < |
3363 | key.objectid + bytes) { | |
ffe2d203 | 3364 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
3b080b25 WS |
3365 | /* |
3366 | * loop until we find next data stripe | |
3367 | * or we have finished all stripes. | |
3368 | */ | |
5a6ac9ea MX |
3369 | loop: |
3370 | physical += map->stripe_len; | |
3371 | ret = get_raid56_logic_offset(physical, | |
3372 | num, map, &logical, | |
3373 | &stripe_logical); | |
3374 | logical += base; | |
3375 | ||
3376 | if (ret && physical < physical_end) { | |
3377 | stripe_logical += base; | |
3378 | stripe_end = stripe_logical + | |
a0dd59de | 3379 | increment; |
5a6ac9ea MX |
3380 | ret = scrub_raid56_parity(sctx, |
3381 | map, scrub_dev, ppath, | |
3382 | stripe_logical, | |
3383 | stripe_end); | |
3384 | if (ret) | |
3385 | goto out; | |
3386 | goto loop; | |
3387 | } | |
3b080b25 WS |
3388 | } else { |
3389 | physical += map->stripe_len; | |
3390 | logical += increment; | |
3391 | } | |
625f1c8d LB |
3392 | if (logical < key.objectid + bytes) { |
3393 | cond_resched(); | |
3394 | goto again; | |
3395 | } | |
3396 | ||
3b080b25 | 3397 | if (physical >= physical_end) { |
625f1c8d LB |
3398 | stop_loop = 1; |
3399 | break; | |
3400 | } | |
3401 | } | |
a2de733c AJ |
3402 | next: |
3403 | path->slots[0]++; | |
3404 | } | |
71267333 | 3405 | btrfs_release_path(path); |
3b080b25 | 3406 | skip: |
a2de733c AJ |
3407 | logical += increment; |
3408 | physical += map->stripe_len; | |
d9d181c1 | 3409 | spin_lock(&sctx->stat_lock); |
625f1c8d LB |
3410 | if (stop_loop) |
3411 | sctx->stat.last_physical = map->stripes[num].physical + | |
3412 | length; | |
3413 | else | |
3414 | sctx->stat.last_physical = physical; | |
d9d181c1 | 3415 | spin_unlock(&sctx->stat_lock); |
625f1c8d LB |
3416 | if (stop_loop) |
3417 | break; | |
a2de733c | 3418 | } |
ff023aac | 3419 | out: |
a2de733c | 3420 | /* push queued extents */ |
d9d181c1 | 3421 | scrub_submit(sctx); |
ff023aac SB |
3422 | mutex_lock(&sctx->wr_ctx.wr_lock); |
3423 | scrub_wr_submit(sctx); | |
3424 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
a2de733c | 3425 | |
e7786c3a | 3426 | blk_finish_plug(&plug); |
a2de733c | 3427 | btrfs_free_path(path); |
5a6ac9ea | 3428 | btrfs_free_path(ppath); |
a2de733c AJ |
3429 | return ret < 0 ? ret : 0; |
3430 | } | |
3431 | ||
d9d181c1 | 3432 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
a36cf8b8 | 3433 | struct btrfs_device *scrub_dev, |
a36cf8b8 | 3434 | u64 chunk_offset, u64 length, |
020d5b73 FM |
3435 | u64 dev_offset, |
3436 | struct btrfs_block_group_cache *cache, | |
3437 | int is_dev_replace) | |
a2de733c AJ |
3438 | { |
3439 | struct btrfs_mapping_tree *map_tree = | |
a36cf8b8 | 3440 | &sctx->dev_root->fs_info->mapping_tree; |
a2de733c AJ |
3441 | struct map_lookup *map; |
3442 | struct extent_map *em; | |
3443 | int i; | |
ff023aac | 3444 | int ret = 0; |
a2de733c AJ |
3445 | |
3446 | read_lock(&map_tree->map_tree.lock); | |
3447 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | |
3448 | read_unlock(&map_tree->map_tree.lock); | |
3449 | ||
020d5b73 FM |
3450 | if (!em) { |
3451 | /* | |
3452 | * Might have been an unused block group deleted by the cleaner | |
3453 | * kthread or relocation. | |
3454 | */ | |
3455 | spin_lock(&cache->lock); | |
3456 | if (!cache->removed) | |
3457 | ret = -EINVAL; | |
3458 | spin_unlock(&cache->lock); | |
3459 | ||
3460 | return ret; | |
3461 | } | |
a2de733c AJ |
3462 | |
3463 | map = (struct map_lookup *)em->bdev; | |
3464 | if (em->start != chunk_offset) | |
3465 | goto out; | |
3466 | ||
3467 | if (em->len < length) | |
3468 | goto out; | |
3469 | ||
3470 | for (i = 0; i < map->num_stripes; ++i) { | |
a36cf8b8 | 3471 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
859acaf1 | 3472 | map->stripes[i].physical == dev_offset) { |
a36cf8b8 | 3473 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
ff023aac SB |
3474 | chunk_offset, length, |
3475 | is_dev_replace); | |
a2de733c AJ |
3476 | if (ret) |
3477 | goto out; | |
3478 | } | |
3479 | } | |
3480 | out: | |
3481 | free_extent_map(em); | |
3482 | ||
3483 | return ret; | |
3484 | } | |
3485 | ||
3486 | static noinline_for_stack | |
a36cf8b8 | 3487 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
ff023aac SB |
3488 | struct btrfs_device *scrub_dev, u64 start, u64 end, |
3489 | int is_dev_replace) | |
a2de733c AJ |
3490 | { |
3491 | struct btrfs_dev_extent *dev_extent = NULL; | |
3492 | struct btrfs_path *path; | |
a36cf8b8 | 3493 | struct btrfs_root *root = sctx->dev_root; |
a2de733c AJ |
3494 | struct btrfs_fs_info *fs_info = root->fs_info; |
3495 | u64 length; | |
a2de733c | 3496 | u64 chunk_offset; |
55e3a601 | 3497 | int ret = 0; |
76a8efa1 | 3498 | int ro_set; |
a2de733c AJ |
3499 | int slot; |
3500 | struct extent_buffer *l; | |
3501 | struct btrfs_key key; | |
3502 | struct btrfs_key found_key; | |
3503 | struct btrfs_block_group_cache *cache; | |
ff023aac | 3504 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
a2de733c AJ |
3505 | |
3506 | path = btrfs_alloc_path(); | |
3507 | if (!path) | |
3508 | return -ENOMEM; | |
3509 | ||
3510 | path->reada = 2; | |
3511 | path->search_commit_root = 1; | |
3512 | path->skip_locking = 1; | |
3513 | ||
a36cf8b8 | 3514 | key.objectid = scrub_dev->devid; |
a2de733c AJ |
3515 | key.offset = 0ull; |
3516 | key.type = BTRFS_DEV_EXTENT_KEY; | |
3517 | ||
a2de733c AJ |
3518 | while (1) { |
3519 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3520 | if (ret < 0) | |
8c51032f AJ |
3521 | break; |
3522 | if (ret > 0) { | |
3523 | if (path->slots[0] >= | |
3524 | btrfs_header_nritems(path->nodes[0])) { | |
3525 | ret = btrfs_next_leaf(root, path); | |
55e3a601 Z |
3526 | if (ret < 0) |
3527 | break; | |
3528 | if (ret > 0) { | |
3529 | ret = 0; | |
8c51032f | 3530 | break; |
55e3a601 Z |
3531 | } |
3532 | } else { | |
3533 | ret = 0; | |
8c51032f AJ |
3534 | } |
3535 | } | |
a2de733c AJ |
3536 | |
3537 | l = path->nodes[0]; | |
3538 | slot = path->slots[0]; | |
3539 | ||
3540 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
3541 | ||
a36cf8b8 | 3542 | if (found_key.objectid != scrub_dev->devid) |
a2de733c AJ |
3543 | break; |
3544 | ||
962a298f | 3545 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) |
a2de733c AJ |
3546 | break; |
3547 | ||
3548 | if (found_key.offset >= end) | |
3549 | break; | |
3550 | ||
3551 | if (found_key.offset < key.offset) | |
3552 | break; | |
3553 | ||
3554 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
3555 | length = btrfs_dev_extent_length(l, dev_extent); | |
3556 | ||
ced96edc QW |
3557 | if (found_key.offset + length <= start) |
3558 | goto skip; | |
a2de733c | 3559 | |
a2de733c AJ |
3560 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); |
3561 | ||
3562 | /* | |
3563 | * get a reference on the corresponding block group to prevent | |
3564 | * the chunk from going away while we scrub it | |
3565 | */ | |
3566 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
ced96edc QW |
3567 | |
3568 | /* some chunks are removed but not committed to disk yet, | |
3569 | * continue scrubbing */ | |
3570 | if (!cache) | |
3571 | goto skip; | |
3572 | ||
55e3a601 Z |
3573 | /* |
3574 | * we need call btrfs_inc_block_group_ro() with scrubs_paused, | |
3575 | * to avoid deadlock caused by: | |
3576 | * btrfs_inc_block_group_ro() | |
3577 | * -> btrfs_wait_for_commit() | |
3578 | * -> btrfs_commit_transaction() | |
3579 | * -> btrfs_scrub_pause() | |
3580 | */ | |
3581 | scrub_pause_on(fs_info); | |
3582 | ret = btrfs_inc_block_group_ro(root, cache); | |
3583 | scrub_pause_off(fs_info); | |
76a8efa1 Z |
3584 | |
3585 | if (ret == 0) { | |
3586 | ro_set = 1; | |
3587 | } else if (ret == -ENOSPC) { | |
3588 | /* | |
3589 | * btrfs_inc_block_group_ro return -ENOSPC when it | |
3590 | * failed in creating new chunk for metadata. | |
3591 | * It is not a problem for scrub/replace, because | |
3592 | * metadata are always cowed, and our scrub paused | |
3593 | * commit_transactions. | |
3594 | */ | |
3595 | ro_set = 0; | |
3596 | } else { | |
3597 | btrfs_warn(fs_info, "failed setting block group ro, ret=%d\n", | |
3598 | ret); | |
55e3a601 Z |
3599 | btrfs_put_block_group(cache); |
3600 | break; | |
3601 | } | |
3602 | ||
ff023aac SB |
3603 | dev_replace->cursor_right = found_key.offset + length; |
3604 | dev_replace->cursor_left = found_key.offset; | |
3605 | dev_replace->item_needs_writeback = 1; | |
8c204c96 | 3606 | ret = scrub_chunk(sctx, scrub_dev, chunk_offset, length, |
020d5b73 | 3607 | found_key.offset, cache, is_dev_replace); |
ff023aac SB |
3608 | |
3609 | /* | |
3610 | * flush, submit all pending read and write bios, afterwards | |
3611 | * wait for them. | |
3612 | * Note that in the dev replace case, a read request causes | |
3613 | * write requests that are submitted in the read completion | |
3614 | * worker. Therefore in the current situation, it is required | |
3615 | * that all write requests are flushed, so that all read and | |
3616 | * write requests are really completed when bios_in_flight | |
3617 | * changes to 0. | |
3618 | */ | |
3619 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); | |
3620 | scrub_submit(sctx); | |
3621 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
3622 | scrub_wr_submit(sctx); | |
3623 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
3624 | ||
3625 | wait_event(sctx->list_wait, | |
3626 | atomic_read(&sctx->bios_in_flight) == 0); | |
b708ce96 Z |
3627 | |
3628 | scrub_pause_on(fs_info); | |
12cf9372 WS |
3629 | |
3630 | /* | |
3631 | * must be called before we decrease @scrub_paused. | |
3632 | * make sure we don't block transaction commit while | |
3633 | * we are waiting pending workers finished. | |
3634 | */ | |
ff023aac SB |
3635 | wait_event(sctx->list_wait, |
3636 | atomic_read(&sctx->workers_pending) == 0); | |
12cf9372 WS |
3637 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
3638 | ||
b708ce96 | 3639 | scrub_pause_off(fs_info); |
ff023aac | 3640 | |
76a8efa1 Z |
3641 | if (ro_set) |
3642 | btrfs_dec_block_group_ro(root, cache); | |
ff023aac | 3643 | |
758f2dfc FM |
3644 | /* |
3645 | * We might have prevented the cleaner kthread from deleting | |
3646 | * this block group if it was already unused because we raced | |
3647 | * and set it to RO mode first. So add it back to the unused | |
3648 | * list, otherwise it might not ever be deleted unless a manual | |
3649 | * balance is triggered or it becomes used and unused again. | |
3650 | */ | |
3651 | spin_lock(&cache->lock); | |
3652 | if (!cache->removed && !cache->ro && cache->reserved == 0 && | |
3653 | btrfs_block_group_used(&cache->item) == 0) { | |
3654 | spin_unlock(&cache->lock); | |
3655 | spin_lock(&fs_info->unused_bgs_lock); | |
3656 | if (list_empty(&cache->bg_list)) { | |
3657 | btrfs_get_block_group(cache); | |
3658 | list_add_tail(&cache->bg_list, | |
3659 | &fs_info->unused_bgs); | |
3660 | } | |
3661 | spin_unlock(&fs_info->unused_bgs_lock); | |
3662 | } else { | |
3663 | spin_unlock(&cache->lock); | |
3664 | } | |
3665 | ||
a2de733c AJ |
3666 | btrfs_put_block_group(cache); |
3667 | if (ret) | |
3668 | break; | |
af1be4f8 SB |
3669 | if (is_dev_replace && |
3670 | atomic64_read(&dev_replace->num_write_errors) > 0) { | |
ff023aac SB |
3671 | ret = -EIO; |
3672 | break; | |
3673 | } | |
3674 | if (sctx->stat.malloc_errors > 0) { | |
3675 | ret = -ENOMEM; | |
3676 | break; | |
3677 | } | |
a2de733c | 3678 | |
539f358a ID |
3679 | dev_replace->cursor_left = dev_replace->cursor_right; |
3680 | dev_replace->item_needs_writeback = 1; | |
ced96edc | 3681 | skip: |
a2de733c | 3682 | key.offset = found_key.offset + length; |
71267333 | 3683 | btrfs_release_path(path); |
a2de733c AJ |
3684 | } |
3685 | ||
a2de733c | 3686 | btrfs_free_path(path); |
8c51032f | 3687 | |
55e3a601 | 3688 | return ret; |
a2de733c AJ |
3689 | } |
3690 | ||
a36cf8b8 SB |
3691 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
3692 | struct btrfs_device *scrub_dev) | |
a2de733c AJ |
3693 | { |
3694 | int i; | |
3695 | u64 bytenr; | |
3696 | u64 gen; | |
3697 | int ret; | |
a36cf8b8 | 3698 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 3699 | |
87533c47 | 3700 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
79787eaa JM |
3701 | return -EIO; |
3702 | ||
5f546063 MX |
3703 | /* Seed devices of a new filesystem has their own generation. */ |
3704 | if (scrub_dev->fs_devices != root->fs_info->fs_devices) | |
3705 | gen = scrub_dev->generation; | |
3706 | else | |
3707 | gen = root->fs_info->last_trans_committed; | |
a2de733c AJ |
3708 | |
3709 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
3710 | bytenr = btrfs_sb_offset(i); | |
935e5cc9 MX |
3711 | if (bytenr + BTRFS_SUPER_INFO_SIZE > |
3712 | scrub_dev->commit_total_bytes) | |
a2de733c AJ |
3713 | break; |
3714 | ||
d9d181c1 | 3715 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
a36cf8b8 | 3716 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
ff023aac | 3717 | NULL, 1, bytenr); |
a2de733c AJ |
3718 | if (ret) |
3719 | return ret; | |
3720 | } | |
b6bfebc1 | 3721 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3722 | |
3723 | return 0; | |
3724 | } | |
3725 | ||
3726 | /* | |
3727 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
3728 | */ | |
ff023aac SB |
3729 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
3730 | int is_dev_replace) | |
a2de733c | 3731 | { |
6f011058 | 3732 | unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND; |
0339ef2f | 3733 | int max_active = fs_info->thread_pool_size; |
a2de733c | 3734 | |
632dd772 | 3735 | if (fs_info->scrub_workers_refcnt == 0) { |
ff023aac | 3736 | if (is_dev_replace) |
0339ef2f QW |
3737 | fs_info->scrub_workers = |
3738 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
3739 | 1, 4); | |
ff023aac | 3740 | else |
0339ef2f QW |
3741 | fs_info->scrub_workers = |
3742 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
3743 | max_active, 4); | |
e82afc52 ZL |
3744 | if (!fs_info->scrub_workers) |
3745 | goto fail_scrub_workers; | |
3746 | ||
0339ef2f QW |
3747 | fs_info->scrub_wr_completion_workers = |
3748 | btrfs_alloc_workqueue("btrfs-scrubwrc", flags, | |
3749 | max_active, 2); | |
e82afc52 ZL |
3750 | if (!fs_info->scrub_wr_completion_workers) |
3751 | goto fail_scrub_wr_completion_workers; | |
3752 | ||
0339ef2f QW |
3753 | fs_info->scrub_nocow_workers = |
3754 | btrfs_alloc_workqueue("btrfs-scrubnc", flags, 1, 0); | |
e82afc52 ZL |
3755 | if (!fs_info->scrub_nocow_workers) |
3756 | goto fail_scrub_nocow_workers; | |
20b2e302 ZL |
3757 | fs_info->scrub_parity_workers = |
3758 | btrfs_alloc_workqueue("btrfs-scrubparity", flags, | |
3759 | max_active, 2); | |
e82afc52 ZL |
3760 | if (!fs_info->scrub_parity_workers) |
3761 | goto fail_scrub_parity_workers; | |
632dd772 | 3762 | } |
a2de733c | 3763 | ++fs_info->scrub_workers_refcnt; |
e82afc52 ZL |
3764 | return 0; |
3765 | ||
3766 | fail_scrub_parity_workers: | |
3767 | btrfs_destroy_workqueue(fs_info->scrub_nocow_workers); | |
3768 | fail_scrub_nocow_workers: | |
3769 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); | |
3770 | fail_scrub_wr_completion_workers: | |
3771 | btrfs_destroy_workqueue(fs_info->scrub_workers); | |
3772 | fail_scrub_workers: | |
3773 | return -ENOMEM; | |
a2de733c AJ |
3774 | } |
3775 | ||
aa1b8cd4 | 3776 | static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info) |
a2de733c | 3777 | { |
ff023aac | 3778 | if (--fs_info->scrub_workers_refcnt == 0) { |
0339ef2f QW |
3779 | btrfs_destroy_workqueue(fs_info->scrub_workers); |
3780 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); | |
3781 | btrfs_destroy_workqueue(fs_info->scrub_nocow_workers); | |
20b2e302 | 3782 | btrfs_destroy_workqueue(fs_info->scrub_parity_workers); |
ff023aac | 3783 | } |
a2de733c | 3784 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
a2de733c AJ |
3785 | } |
3786 | ||
aa1b8cd4 SB |
3787 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
3788 | u64 end, struct btrfs_scrub_progress *progress, | |
63a212ab | 3789 | int readonly, int is_dev_replace) |
a2de733c | 3790 | { |
d9d181c1 | 3791 | struct scrub_ctx *sctx; |
a2de733c AJ |
3792 | int ret; |
3793 | struct btrfs_device *dev; | |
5d68da3b | 3794 | struct rcu_string *name; |
a2de733c | 3795 | |
aa1b8cd4 | 3796 | if (btrfs_fs_closing(fs_info)) |
a2de733c AJ |
3797 | return -EINVAL; |
3798 | ||
aa1b8cd4 | 3799 | if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) { |
b5d67f64 SB |
3800 | /* |
3801 | * in this case scrub is unable to calculate the checksum | |
3802 | * the way scrub is implemented. Do not handle this | |
3803 | * situation at all because it won't ever happen. | |
3804 | */ | |
efe120a0 FH |
3805 | btrfs_err(fs_info, |
3806 | "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails", | |
aa1b8cd4 | 3807 | fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN); |
b5d67f64 SB |
3808 | return -EINVAL; |
3809 | } | |
3810 | ||
aa1b8cd4 | 3811 | if (fs_info->chunk_root->sectorsize != PAGE_SIZE) { |
b5d67f64 | 3812 | /* not supported for data w/o checksums */ |
efe120a0 FH |
3813 | btrfs_err(fs_info, |
3814 | "scrub: size assumption sectorsize != PAGE_SIZE " | |
3815 | "(%d != %lu) fails", | |
27f9f023 | 3816 | fs_info->chunk_root->sectorsize, PAGE_SIZE); |
a2de733c AJ |
3817 | return -EINVAL; |
3818 | } | |
3819 | ||
7a9e9987 SB |
3820 | if (fs_info->chunk_root->nodesize > |
3821 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || | |
3822 | fs_info->chunk_root->sectorsize > | |
3823 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { | |
3824 | /* | |
3825 | * would exhaust the array bounds of pagev member in | |
3826 | * struct scrub_block | |
3827 | */ | |
efe120a0 FH |
3828 | btrfs_err(fs_info, "scrub: size assumption nodesize and sectorsize " |
3829 | "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails", | |
7a9e9987 SB |
3830 | fs_info->chunk_root->nodesize, |
3831 | SCRUB_MAX_PAGES_PER_BLOCK, | |
3832 | fs_info->chunk_root->sectorsize, | |
3833 | SCRUB_MAX_PAGES_PER_BLOCK); | |
3834 | return -EINVAL; | |
3835 | } | |
3836 | ||
a2de733c | 3837 | |
aa1b8cd4 SB |
3838 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
3839 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); | |
63a212ab | 3840 | if (!dev || (dev->missing && !is_dev_replace)) { |
aa1b8cd4 | 3841 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
3842 | return -ENODEV; |
3843 | } | |
a2de733c | 3844 | |
5d68da3b MX |
3845 | if (!is_dev_replace && !readonly && !dev->writeable) { |
3846 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
3847 | rcu_read_lock(); | |
3848 | name = rcu_dereference(dev->name); | |
3849 | btrfs_err(fs_info, "scrub: device %s is not writable", | |
3850 | name->str); | |
3851 | rcu_read_unlock(); | |
3852 | return -EROFS; | |
3853 | } | |
3854 | ||
3b7a016f | 3855 | mutex_lock(&fs_info->scrub_lock); |
63a212ab | 3856 | if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) { |
a2de733c | 3857 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3858 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
aa1b8cd4 | 3859 | return -EIO; |
a2de733c AJ |
3860 | } |
3861 | ||
8dabb742 SB |
3862 | btrfs_dev_replace_lock(&fs_info->dev_replace); |
3863 | if (dev->scrub_device || | |
3864 | (!is_dev_replace && | |
3865 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { | |
3866 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
a2de733c | 3867 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3868 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
3869 | return -EINPROGRESS; |
3870 | } | |
8dabb742 | 3871 | btrfs_dev_replace_unlock(&fs_info->dev_replace); |
3b7a016f WS |
3872 | |
3873 | ret = scrub_workers_get(fs_info, is_dev_replace); | |
3874 | if (ret) { | |
3875 | mutex_unlock(&fs_info->scrub_lock); | |
3876 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
3877 | return ret; | |
3878 | } | |
3879 | ||
63a212ab | 3880 | sctx = scrub_setup_ctx(dev, is_dev_replace); |
d9d181c1 | 3881 | if (IS_ERR(sctx)) { |
a2de733c | 3882 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 SB |
3883 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
3884 | scrub_workers_put(fs_info); | |
d9d181c1 | 3885 | return PTR_ERR(sctx); |
a2de733c | 3886 | } |
d9d181c1 SB |
3887 | sctx->readonly = readonly; |
3888 | dev->scrub_device = sctx; | |
3cb0929a | 3889 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 3890 | |
3cb0929a WS |
3891 | /* |
3892 | * checking @scrub_pause_req here, we can avoid | |
3893 | * race between committing transaction and scrubbing. | |
3894 | */ | |
cb7ab021 | 3895 | __scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3896 | atomic_inc(&fs_info->scrubs_running); |
3897 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c | 3898 | |
ff023aac | 3899 | if (!is_dev_replace) { |
9b011adf WS |
3900 | /* |
3901 | * by holding device list mutex, we can | |
3902 | * kick off writing super in log tree sync. | |
3903 | */ | |
3cb0929a | 3904 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3905 | ret = scrub_supers(sctx, dev); |
3cb0929a | 3906 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3907 | } |
a2de733c AJ |
3908 | |
3909 | if (!ret) | |
ff023aac SB |
3910 | ret = scrub_enumerate_chunks(sctx, dev, start, end, |
3911 | is_dev_replace); | |
a2de733c | 3912 | |
b6bfebc1 | 3913 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3914 | atomic_dec(&fs_info->scrubs_running); |
3915 | wake_up(&fs_info->scrub_pause_wait); | |
3916 | ||
b6bfebc1 | 3917 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
0ef8e451 | 3918 | |
a2de733c | 3919 | if (progress) |
d9d181c1 | 3920 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
a2de733c AJ |
3921 | |
3922 | mutex_lock(&fs_info->scrub_lock); | |
3923 | dev->scrub_device = NULL; | |
3b7a016f | 3924 | scrub_workers_put(fs_info); |
a2de733c AJ |
3925 | mutex_unlock(&fs_info->scrub_lock); |
3926 | ||
f55985f4 | 3927 | scrub_put_ctx(sctx); |
a2de733c AJ |
3928 | |
3929 | return ret; | |
3930 | } | |
3931 | ||
143bede5 | 3932 | void btrfs_scrub_pause(struct btrfs_root *root) |
a2de733c AJ |
3933 | { |
3934 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3935 | ||
3936 | mutex_lock(&fs_info->scrub_lock); | |
3937 | atomic_inc(&fs_info->scrub_pause_req); | |
3938 | while (atomic_read(&fs_info->scrubs_paused) != | |
3939 | atomic_read(&fs_info->scrubs_running)) { | |
3940 | mutex_unlock(&fs_info->scrub_lock); | |
3941 | wait_event(fs_info->scrub_pause_wait, | |
3942 | atomic_read(&fs_info->scrubs_paused) == | |
3943 | atomic_read(&fs_info->scrubs_running)); | |
3944 | mutex_lock(&fs_info->scrub_lock); | |
3945 | } | |
3946 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c AJ |
3947 | } |
3948 | ||
143bede5 | 3949 | void btrfs_scrub_continue(struct btrfs_root *root) |
a2de733c AJ |
3950 | { |
3951 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3952 | ||
3953 | atomic_dec(&fs_info->scrub_pause_req); | |
3954 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
3955 | } |
3956 | ||
aa1b8cd4 | 3957 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
a2de733c | 3958 | { |
a2de733c AJ |
3959 | mutex_lock(&fs_info->scrub_lock); |
3960 | if (!atomic_read(&fs_info->scrubs_running)) { | |
3961 | mutex_unlock(&fs_info->scrub_lock); | |
3962 | return -ENOTCONN; | |
3963 | } | |
3964 | ||
3965 | atomic_inc(&fs_info->scrub_cancel_req); | |
3966 | while (atomic_read(&fs_info->scrubs_running)) { | |
3967 | mutex_unlock(&fs_info->scrub_lock); | |
3968 | wait_event(fs_info->scrub_pause_wait, | |
3969 | atomic_read(&fs_info->scrubs_running) == 0); | |
3970 | mutex_lock(&fs_info->scrub_lock); | |
3971 | } | |
3972 | atomic_dec(&fs_info->scrub_cancel_req); | |
3973 | mutex_unlock(&fs_info->scrub_lock); | |
3974 | ||
3975 | return 0; | |
3976 | } | |
3977 | ||
aa1b8cd4 SB |
3978 | int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info, |
3979 | struct btrfs_device *dev) | |
49b25e05 | 3980 | { |
d9d181c1 | 3981 | struct scrub_ctx *sctx; |
a2de733c AJ |
3982 | |
3983 | mutex_lock(&fs_info->scrub_lock); | |
d9d181c1 SB |
3984 | sctx = dev->scrub_device; |
3985 | if (!sctx) { | |
a2de733c AJ |
3986 | mutex_unlock(&fs_info->scrub_lock); |
3987 | return -ENOTCONN; | |
3988 | } | |
d9d181c1 | 3989 | atomic_inc(&sctx->cancel_req); |
a2de733c AJ |
3990 | while (dev->scrub_device) { |
3991 | mutex_unlock(&fs_info->scrub_lock); | |
3992 | wait_event(fs_info->scrub_pause_wait, | |
3993 | dev->scrub_device == NULL); | |
3994 | mutex_lock(&fs_info->scrub_lock); | |
3995 | } | |
3996 | mutex_unlock(&fs_info->scrub_lock); | |
3997 | ||
3998 | return 0; | |
3999 | } | |
1623edeb | 4000 | |
a2de733c AJ |
4001 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, |
4002 | struct btrfs_scrub_progress *progress) | |
4003 | { | |
4004 | struct btrfs_device *dev; | |
d9d181c1 | 4005 | struct scrub_ctx *sctx = NULL; |
a2de733c AJ |
4006 | |
4007 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
aa1b8cd4 | 4008 | dev = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
a2de733c | 4009 | if (dev) |
d9d181c1 SB |
4010 | sctx = dev->scrub_device; |
4011 | if (sctx) | |
4012 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
a2de733c AJ |
4013 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
4014 | ||
d9d181c1 | 4015 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
a2de733c | 4016 | } |
ff023aac SB |
4017 | |
4018 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
4019 | u64 extent_logical, u64 extent_len, | |
4020 | u64 *extent_physical, | |
4021 | struct btrfs_device **extent_dev, | |
4022 | int *extent_mirror_num) | |
4023 | { | |
4024 | u64 mapped_length; | |
4025 | struct btrfs_bio *bbio = NULL; | |
4026 | int ret; | |
4027 | ||
4028 | mapped_length = extent_len; | |
4029 | ret = btrfs_map_block(fs_info, READ, extent_logical, | |
4030 | &mapped_length, &bbio, 0); | |
4031 | if (ret || !bbio || mapped_length < extent_len || | |
4032 | !bbio->stripes[0].dev->bdev) { | |
6e9606d2 | 4033 | btrfs_put_bbio(bbio); |
ff023aac SB |
4034 | return; |
4035 | } | |
4036 | ||
4037 | *extent_physical = bbio->stripes[0].physical; | |
4038 | *extent_mirror_num = bbio->mirror_num; | |
4039 | *extent_dev = bbio->stripes[0].dev; | |
6e9606d2 | 4040 | btrfs_put_bbio(bbio); |
ff023aac SB |
4041 | } |
4042 | ||
4043 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
4044 | struct scrub_wr_ctx *wr_ctx, | |
4045 | struct btrfs_fs_info *fs_info, | |
4046 | struct btrfs_device *dev, | |
4047 | int is_dev_replace) | |
4048 | { | |
4049 | WARN_ON(wr_ctx->wr_curr_bio != NULL); | |
4050 | ||
4051 | mutex_init(&wr_ctx->wr_lock); | |
4052 | wr_ctx->wr_curr_bio = NULL; | |
4053 | if (!is_dev_replace) | |
4054 | return 0; | |
4055 | ||
4056 | WARN_ON(!dev->bdev); | |
b54ffb73 | 4057 | wr_ctx->pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO; |
ff023aac SB |
4058 | wr_ctx->tgtdev = dev; |
4059 | atomic_set(&wr_ctx->flush_all_writes, 0); | |
4060 | return 0; | |
4061 | } | |
4062 | ||
4063 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx) | |
4064 | { | |
4065 | mutex_lock(&wr_ctx->wr_lock); | |
4066 | kfree(wr_ctx->wr_curr_bio); | |
4067 | wr_ctx->wr_curr_bio = NULL; | |
4068 | mutex_unlock(&wr_ctx->wr_lock); | |
4069 | } | |
4070 | ||
4071 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, | |
4072 | int mirror_num, u64 physical_for_dev_replace) | |
4073 | { | |
4074 | struct scrub_copy_nocow_ctx *nocow_ctx; | |
4075 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
4076 | ||
4077 | nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS); | |
4078 | if (!nocow_ctx) { | |
4079 | spin_lock(&sctx->stat_lock); | |
4080 | sctx->stat.malloc_errors++; | |
4081 | spin_unlock(&sctx->stat_lock); | |
4082 | return -ENOMEM; | |
4083 | } | |
4084 | ||
4085 | scrub_pending_trans_workers_inc(sctx); | |
4086 | ||
4087 | nocow_ctx->sctx = sctx; | |
4088 | nocow_ctx->logical = logical; | |
4089 | nocow_ctx->len = len; | |
4090 | nocow_ctx->mirror_num = mirror_num; | |
4091 | nocow_ctx->physical_for_dev_replace = physical_for_dev_replace; | |
9e0af237 LB |
4092 | btrfs_init_work(&nocow_ctx->work, btrfs_scrubnc_helper, |
4093 | copy_nocow_pages_worker, NULL, NULL); | |
652f25a2 | 4094 | INIT_LIST_HEAD(&nocow_ctx->inodes); |
0339ef2f QW |
4095 | btrfs_queue_work(fs_info->scrub_nocow_workers, |
4096 | &nocow_ctx->work); | |
ff023aac SB |
4097 | |
4098 | return 0; | |
4099 | } | |
4100 | ||
652f25a2 JB |
4101 | static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx) |
4102 | { | |
4103 | struct scrub_copy_nocow_ctx *nocow_ctx = ctx; | |
4104 | struct scrub_nocow_inode *nocow_inode; | |
4105 | ||
4106 | nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS); | |
4107 | if (!nocow_inode) | |
4108 | return -ENOMEM; | |
4109 | nocow_inode->inum = inum; | |
4110 | nocow_inode->offset = offset; | |
4111 | nocow_inode->root = root; | |
4112 | list_add_tail(&nocow_inode->list, &nocow_ctx->inodes); | |
4113 | return 0; | |
4114 | } | |
4115 | ||
4116 | #define COPY_COMPLETE 1 | |
4117 | ||
ff023aac SB |
4118 | static void copy_nocow_pages_worker(struct btrfs_work *work) |
4119 | { | |
4120 | struct scrub_copy_nocow_ctx *nocow_ctx = | |
4121 | container_of(work, struct scrub_copy_nocow_ctx, work); | |
4122 | struct scrub_ctx *sctx = nocow_ctx->sctx; | |
4123 | u64 logical = nocow_ctx->logical; | |
4124 | u64 len = nocow_ctx->len; | |
4125 | int mirror_num = nocow_ctx->mirror_num; | |
4126 | u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; | |
4127 | int ret; | |
4128 | struct btrfs_trans_handle *trans = NULL; | |
4129 | struct btrfs_fs_info *fs_info; | |
4130 | struct btrfs_path *path; | |
4131 | struct btrfs_root *root; | |
4132 | int not_written = 0; | |
4133 | ||
4134 | fs_info = sctx->dev_root->fs_info; | |
4135 | root = fs_info->extent_root; | |
4136 | ||
4137 | path = btrfs_alloc_path(); | |
4138 | if (!path) { | |
4139 | spin_lock(&sctx->stat_lock); | |
4140 | sctx->stat.malloc_errors++; | |
4141 | spin_unlock(&sctx->stat_lock); | |
4142 | not_written = 1; | |
4143 | goto out; | |
4144 | } | |
4145 | ||
4146 | trans = btrfs_join_transaction(root); | |
4147 | if (IS_ERR(trans)) { | |
4148 | not_written = 1; | |
4149 | goto out; | |
4150 | } | |
4151 | ||
4152 | ret = iterate_inodes_from_logical(logical, fs_info, path, | |
652f25a2 | 4153 | record_inode_for_nocow, nocow_ctx); |
ff023aac | 4154 | if (ret != 0 && ret != -ENOENT) { |
efe120a0 FH |
4155 | btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, " |
4156 | "phys %llu, len %llu, mir %u, ret %d", | |
118a0a25 GU |
4157 | logical, physical_for_dev_replace, len, mirror_num, |
4158 | ret); | |
ff023aac SB |
4159 | not_written = 1; |
4160 | goto out; | |
4161 | } | |
4162 | ||
652f25a2 JB |
4163 | btrfs_end_transaction(trans, root); |
4164 | trans = NULL; | |
4165 | while (!list_empty(&nocow_ctx->inodes)) { | |
4166 | struct scrub_nocow_inode *entry; | |
4167 | entry = list_first_entry(&nocow_ctx->inodes, | |
4168 | struct scrub_nocow_inode, | |
4169 | list); | |
4170 | list_del_init(&entry->list); | |
4171 | ret = copy_nocow_pages_for_inode(entry->inum, entry->offset, | |
4172 | entry->root, nocow_ctx); | |
4173 | kfree(entry); | |
4174 | if (ret == COPY_COMPLETE) { | |
4175 | ret = 0; | |
4176 | break; | |
4177 | } else if (ret) { | |
4178 | break; | |
4179 | } | |
4180 | } | |
ff023aac | 4181 | out: |
652f25a2 JB |
4182 | while (!list_empty(&nocow_ctx->inodes)) { |
4183 | struct scrub_nocow_inode *entry; | |
4184 | entry = list_first_entry(&nocow_ctx->inodes, | |
4185 | struct scrub_nocow_inode, | |
4186 | list); | |
4187 | list_del_init(&entry->list); | |
4188 | kfree(entry); | |
4189 | } | |
ff023aac SB |
4190 | if (trans && !IS_ERR(trans)) |
4191 | btrfs_end_transaction(trans, root); | |
4192 | if (not_written) | |
4193 | btrfs_dev_replace_stats_inc(&fs_info->dev_replace. | |
4194 | num_uncorrectable_read_errors); | |
4195 | ||
4196 | btrfs_free_path(path); | |
4197 | kfree(nocow_ctx); | |
4198 | ||
4199 | scrub_pending_trans_workers_dec(sctx); | |
4200 | } | |
4201 | ||
32159242 GH |
4202 | static int check_extent_to_block(struct inode *inode, u64 start, u64 len, |
4203 | u64 logical) | |
4204 | { | |
4205 | struct extent_state *cached_state = NULL; | |
4206 | struct btrfs_ordered_extent *ordered; | |
4207 | struct extent_io_tree *io_tree; | |
4208 | struct extent_map *em; | |
4209 | u64 lockstart = start, lockend = start + len - 1; | |
4210 | int ret = 0; | |
4211 | ||
4212 | io_tree = &BTRFS_I(inode)->io_tree; | |
4213 | ||
4214 | lock_extent_bits(io_tree, lockstart, lockend, 0, &cached_state); | |
4215 | ordered = btrfs_lookup_ordered_range(inode, lockstart, len); | |
4216 | if (ordered) { | |
4217 | btrfs_put_ordered_extent(ordered); | |
4218 | ret = 1; | |
4219 | goto out_unlock; | |
4220 | } | |
4221 | ||
4222 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
4223 | if (IS_ERR(em)) { | |
4224 | ret = PTR_ERR(em); | |
4225 | goto out_unlock; | |
4226 | } | |
4227 | ||
4228 | /* | |
4229 | * This extent does not actually cover the logical extent anymore, | |
4230 | * move on to the next inode. | |
4231 | */ | |
4232 | if (em->block_start > logical || | |
4233 | em->block_start + em->block_len < logical + len) { | |
4234 | free_extent_map(em); | |
4235 | ret = 1; | |
4236 | goto out_unlock; | |
4237 | } | |
4238 | free_extent_map(em); | |
4239 | ||
4240 | out_unlock: | |
4241 | unlock_extent_cached(io_tree, lockstart, lockend, &cached_state, | |
4242 | GFP_NOFS); | |
4243 | return ret; | |
4244 | } | |
4245 | ||
652f25a2 JB |
4246 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, |
4247 | struct scrub_copy_nocow_ctx *nocow_ctx) | |
ff023aac | 4248 | { |
826aa0a8 | 4249 | struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info; |
ff023aac | 4250 | struct btrfs_key key; |
826aa0a8 MX |
4251 | struct inode *inode; |
4252 | struct page *page; | |
ff023aac | 4253 | struct btrfs_root *local_root; |
652f25a2 | 4254 | struct extent_io_tree *io_tree; |
ff023aac | 4255 | u64 physical_for_dev_replace; |
32159242 | 4256 | u64 nocow_ctx_logical; |
652f25a2 | 4257 | u64 len = nocow_ctx->len; |
826aa0a8 | 4258 | unsigned long index; |
6f1c3605 | 4259 | int srcu_index; |
652f25a2 JB |
4260 | int ret = 0; |
4261 | int err = 0; | |
ff023aac SB |
4262 | |
4263 | key.objectid = root; | |
4264 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4265 | key.offset = (u64)-1; | |
6f1c3605 LB |
4266 | |
4267 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
4268 | ||
ff023aac | 4269 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); |
6f1c3605 LB |
4270 | if (IS_ERR(local_root)) { |
4271 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
ff023aac | 4272 | return PTR_ERR(local_root); |
6f1c3605 | 4273 | } |
ff023aac SB |
4274 | |
4275 | key.type = BTRFS_INODE_ITEM_KEY; | |
4276 | key.objectid = inum; | |
4277 | key.offset = 0; | |
4278 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); | |
6f1c3605 | 4279 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
ff023aac SB |
4280 | if (IS_ERR(inode)) |
4281 | return PTR_ERR(inode); | |
4282 | ||
edd1400b MX |
4283 | /* Avoid truncate/dio/punch hole.. */ |
4284 | mutex_lock(&inode->i_mutex); | |
4285 | inode_dio_wait(inode); | |
4286 | ||
ff023aac | 4287 | physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; |
652f25a2 | 4288 | io_tree = &BTRFS_I(inode)->io_tree; |
32159242 | 4289 | nocow_ctx_logical = nocow_ctx->logical; |
652f25a2 | 4290 | |
32159242 GH |
4291 | ret = check_extent_to_block(inode, offset, len, nocow_ctx_logical); |
4292 | if (ret) { | |
4293 | ret = ret > 0 ? 0 : ret; | |
4294 | goto out; | |
652f25a2 | 4295 | } |
652f25a2 | 4296 | |
ff023aac | 4297 | while (len >= PAGE_CACHE_SIZE) { |
ff023aac | 4298 | index = offset >> PAGE_CACHE_SHIFT; |
edd1400b | 4299 | again: |
ff023aac SB |
4300 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
4301 | if (!page) { | |
efe120a0 | 4302 | btrfs_err(fs_info, "find_or_create_page() failed"); |
ff023aac | 4303 | ret = -ENOMEM; |
826aa0a8 | 4304 | goto out; |
ff023aac SB |
4305 | } |
4306 | ||
4307 | if (PageUptodate(page)) { | |
4308 | if (PageDirty(page)) | |
4309 | goto next_page; | |
4310 | } else { | |
4311 | ClearPageError(page); | |
32159242 | 4312 | err = extent_read_full_page(io_tree, page, |
652f25a2 JB |
4313 | btrfs_get_extent, |
4314 | nocow_ctx->mirror_num); | |
826aa0a8 MX |
4315 | if (err) { |
4316 | ret = err; | |
ff023aac SB |
4317 | goto next_page; |
4318 | } | |
edd1400b | 4319 | |
26b25891 | 4320 | lock_page(page); |
edd1400b MX |
4321 | /* |
4322 | * If the page has been remove from the page cache, | |
4323 | * the data on it is meaningless, because it may be | |
4324 | * old one, the new data may be written into the new | |
4325 | * page in the page cache. | |
4326 | */ | |
4327 | if (page->mapping != inode->i_mapping) { | |
652f25a2 | 4328 | unlock_page(page); |
edd1400b MX |
4329 | page_cache_release(page); |
4330 | goto again; | |
4331 | } | |
ff023aac SB |
4332 | if (!PageUptodate(page)) { |
4333 | ret = -EIO; | |
4334 | goto next_page; | |
4335 | } | |
4336 | } | |
32159242 GH |
4337 | |
4338 | ret = check_extent_to_block(inode, offset, len, | |
4339 | nocow_ctx_logical); | |
4340 | if (ret) { | |
4341 | ret = ret > 0 ? 0 : ret; | |
4342 | goto next_page; | |
4343 | } | |
4344 | ||
826aa0a8 MX |
4345 | err = write_page_nocow(nocow_ctx->sctx, |
4346 | physical_for_dev_replace, page); | |
4347 | if (err) | |
4348 | ret = err; | |
ff023aac | 4349 | next_page: |
826aa0a8 MX |
4350 | unlock_page(page); |
4351 | page_cache_release(page); | |
4352 | ||
4353 | if (ret) | |
4354 | break; | |
4355 | ||
ff023aac SB |
4356 | offset += PAGE_CACHE_SIZE; |
4357 | physical_for_dev_replace += PAGE_CACHE_SIZE; | |
32159242 | 4358 | nocow_ctx_logical += PAGE_CACHE_SIZE; |
ff023aac SB |
4359 | len -= PAGE_CACHE_SIZE; |
4360 | } | |
652f25a2 | 4361 | ret = COPY_COMPLETE; |
826aa0a8 | 4362 | out: |
edd1400b | 4363 | mutex_unlock(&inode->i_mutex); |
826aa0a8 | 4364 | iput(inode); |
ff023aac SB |
4365 | return ret; |
4366 | } | |
4367 | ||
4368 | static int write_page_nocow(struct scrub_ctx *sctx, | |
4369 | u64 physical_for_dev_replace, struct page *page) | |
4370 | { | |
4371 | struct bio *bio; | |
4372 | struct btrfs_device *dev; | |
4373 | int ret; | |
ff023aac SB |
4374 | |
4375 | dev = sctx->wr_ctx.tgtdev; | |
4376 | if (!dev) | |
4377 | return -EIO; | |
4378 | if (!dev->bdev) { | |
94647322 DS |
4379 | btrfs_warn_rl(dev->dev_root->fs_info, |
4380 | "scrub write_page_nocow(bdev == NULL) is unexpected"); | |
ff023aac SB |
4381 | return -EIO; |
4382 | } | |
9be3395b | 4383 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
ff023aac SB |
4384 | if (!bio) { |
4385 | spin_lock(&sctx->stat_lock); | |
4386 | sctx->stat.malloc_errors++; | |
4387 | spin_unlock(&sctx->stat_lock); | |
4388 | return -ENOMEM; | |
4389 | } | |
4f024f37 KO |
4390 | bio->bi_iter.bi_size = 0; |
4391 | bio->bi_iter.bi_sector = physical_for_dev_replace >> 9; | |
ff023aac SB |
4392 | bio->bi_bdev = dev->bdev; |
4393 | ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); | |
4394 | if (ret != PAGE_CACHE_SIZE) { | |
4395 | leave_with_eio: | |
4396 | bio_put(bio); | |
4397 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); | |
4398 | return -EIO; | |
4399 | } | |
ff023aac | 4400 | |
33879d45 | 4401 | if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) |
ff023aac SB |
4402 | goto leave_with_eio; |
4403 | ||
4404 | bio_put(bio); | |
4405 | return 0; | |
4406 | } |