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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; | |
69 | u64 *raid_map; | |
70 | u64 map_length; | |
71 | }; | |
72 | ||
a2de733c | 73 | struct scrub_page { |
b5d67f64 SB |
74 | struct scrub_block *sblock; |
75 | struct page *page; | |
442a4f63 | 76 | struct btrfs_device *dev; |
5a6ac9ea | 77 | struct list_head list; |
a2de733c AJ |
78 | u64 flags; /* extent flags */ |
79 | u64 generation; | |
b5d67f64 SB |
80 | u64 logical; |
81 | u64 physical; | |
ff023aac | 82 | u64 physical_for_dev_replace; |
7a9e9987 | 83 | atomic_t ref_count; |
b5d67f64 SB |
84 | struct { |
85 | unsigned int mirror_num:8; | |
86 | unsigned int have_csum:1; | |
87 | unsigned int io_error:1; | |
88 | }; | |
a2de733c | 89 | u8 csum[BTRFS_CSUM_SIZE]; |
af8e2d1d MX |
90 | |
91 | struct scrub_recover *recover; | |
a2de733c AJ |
92 | }; |
93 | ||
94 | struct scrub_bio { | |
95 | int index; | |
d9d181c1 | 96 | struct scrub_ctx *sctx; |
a36cf8b8 | 97 | struct btrfs_device *dev; |
a2de733c AJ |
98 | struct bio *bio; |
99 | int err; | |
100 | u64 logical; | |
101 | u64 physical; | |
ff023aac SB |
102 | #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO |
103 | struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO]; | |
104 | #else | |
105 | struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO]; | |
106 | #endif | |
b5d67f64 | 107 | int page_count; |
a2de733c AJ |
108 | int next_free; |
109 | struct btrfs_work work; | |
110 | }; | |
111 | ||
b5d67f64 | 112 | struct scrub_block { |
7a9e9987 | 113 | struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK]; |
b5d67f64 SB |
114 | int page_count; |
115 | atomic_t outstanding_pages; | |
116 | atomic_t ref_count; /* free mem on transition to zero */ | |
d9d181c1 | 117 | struct scrub_ctx *sctx; |
5a6ac9ea | 118 | struct scrub_parity *sparity; |
b5d67f64 SB |
119 | struct { |
120 | unsigned int header_error:1; | |
121 | unsigned int checksum_error:1; | |
122 | unsigned int no_io_error_seen:1; | |
442a4f63 | 123 | unsigned int generation_error:1; /* also sets header_error */ |
5a6ac9ea MX |
124 | |
125 | /* The following is for the data used to check parity */ | |
126 | /* It is for the data with checksum */ | |
127 | unsigned int data_corrected:1; | |
b5d67f64 SB |
128 | }; |
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 | ||
145 | atomic_t ref_count; | |
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; | |
197 | }; | |
198 | ||
0ef8e451 | 199 | struct scrub_fixup_nodatasum { |
d9d181c1 | 200 | struct scrub_ctx *sctx; |
a36cf8b8 | 201 | struct btrfs_device *dev; |
0ef8e451 JS |
202 | u64 logical; |
203 | struct btrfs_root *root; | |
204 | struct btrfs_work work; | |
205 | int mirror_num; | |
206 | }; | |
207 | ||
652f25a2 JB |
208 | struct scrub_nocow_inode { |
209 | u64 inum; | |
210 | u64 offset; | |
211 | u64 root; | |
212 | struct list_head list; | |
213 | }; | |
214 | ||
ff023aac SB |
215 | struct scrub_copy_nocow_ctx { |
216 | struct scrub_ctx *sctx; | |
217 | u64 logical; | |
218 | u64 len; | |
219 | int mirror_num; | |
220 | u64 physical_for_dev_replace; | |
652f25a2 | 221 | struct list_head inodes; |
ff023aac SB |
222 | struct btrfs_work work; |
223 | }; | |
224 | ||
558540c1 JS |
225 | struct scrub_warning { |
226 | struct btrfs_path *path; | |
227 | u64 extent_item_size; | |
558540c1 JS |
228 | const char *errstr; |
229 | sector_t sector; | |
230 | u64 logical; | |
231 | struct btrfs_device *dev; | |
558540c1 JS |
232 | }; |
233 | ||
b6bfebc1 SB |
234 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx); |
235 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx); | |
236 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx); | |
237 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx); | |
b5d67f64 | 238 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check); |
d9d181c1 | 239 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
3ec706c8 | 240 | struct btrfs_fs_info *fs_info, |
ff023aac | 241 | struct scrub_block *original_sblock, |
b5d67f64 | 242 | u64 length, u64 logical, |
ff023aac | 243 | struct scrub_block *sblocks_for_recheck); |
34f5c8e9 SB |
244 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
245 | struct scrub_block *sblock, int is_metadata, | |
246 | int have_csum, u8 *csum, u64 generation, | |
af8e2d1d | 247 | u16 csum_size, int retry_failed_mirror); |
b5d67f64 SB |
248 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
249 | struct scrub_block *sblock, | |
250 | int is_metadata, int have_csum, | |
251 | const u8 *csum, u64 generation, | |
252 | u16 csum_size); | |
b5d67f64 SB |
253 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
254 | struct scrub_block *sblock_good, | |
255 | int force_write); | |
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); | |
1623edeb | 277 | static void scrub_bio_end_io(struct bio *bio, int err); |
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); | |
294 | static void scrub_wr_bio_end_io(struct bio *bio, int err); | |
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); |
1623edeb SB |
305 | |
306 | ||
b6bfebc1 SB |
307 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx) |
308 | { | |
309 | atomic_inc(&sctx->bios_in_flight); | |
310 | } | |
311 | ||
312 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx) | |
313 | { | |
314 | atomic_dec(&sctx->bios_in_flight); | |
315 | wake_up(&sctx->list_wait); | |
316 | } | |
317 | ||
cb7ab021 | 318 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
3cb0929a WS |
319 | { |
320 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
321 | mutex_unlock(&fs_info->scrub_lock); | |
322 | wait_event(fs_info->scrub_pause_wait, | |
323 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
324 | mutex_lock(&fs_info->scrub_lock); | |
325 | } | |
326 | } | |
327 | ||
cb7ab021 WS |
328 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
329 | { | |
330 | atomic_inc(&fs_info->scrubs_paused); | |
331 | wake_up(&fs_info->scrub_pause_wait); | |
332 | ||
333 | mutex_lock(&fs_info->scrub_lock); | |
334 | __scrub_blocked_if_needed(fs_info); | |
335 | atomic_dec(&fs_info->scrubs_paused); | |
336 | mutex_unlock(&fs_info->scrub_lock); | |
337 | ||
338 | wake_up(&fs_info->scrub_pause_wait); | |
339 | } | |
340 | ||
b6bfebc1 SB |
341 | /* |
342 | * used for workers that require transaction commits (i.e., for the | |
343 | * NOCOW case) | |
344 | */ | |
345 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx) | |
346 | { | |
347 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
348 | ||
349 | /* | |
350 | * increment scrubs_running to prevent cancel requests from | |
351 | * completing as long as a worker is running. we must also | |
352 | * increment scrubs_paused to prevent deadlocking on pause | |
353 | * requests used for transactions commits (as the worker uses a | |
354 | * transaction context). it is safe to regard the worker | |
355 | * as paused for all matters practical. effectively, we only | |
356 | * avoid cancellation requests from completing. | |
357 | */ | |
358 | mutex_lock(&fs_info->scrub_lock); | |
359 | atomic_inc(&fs_info->scrubs_running); | |
360 | atomic_inc(&fs_info->scrubs_paused); | |
361 | mutex_unlock(&fs_info->scrub_lock); | |
32a44789 WS |
362 | |
363 | /* | |
364 | * check if @scrubs_running=@scrubs_paused condition | |
365 | * inside wait_event() is not an atomic operation. | |
366 | * which means we may inc/dec @scrub_running/paused | |
367 | * at any time. Let's wake up @scrub_pause_wait as | |
368 | * much as we can to let commit transaction blocked less. | |
369 | */ | |
370 | wake_up(&fs_info->scrub_pause_wait); | |
371 | ||
b6bfebc1 SB |
372 | atomic_inc(&sctx->workers_pending); |
373 | } | |
374 | ||
375 | /* used for workers that require transaction commits */ | |
376 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx) | |
377 | { | |
378 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
379 | ||
380 | /* | |
381 | * see scrub_pending_trans_workers_inc() why we're pretending | |
382 | * to be paused in the scrub counters | |
383 | */ | |
384 | mutex_lock(&fs_info->scrub_lock); | |
385 | atomic_dec(&fs_info->scrubs_running); | |
386 | atomic_dec(&fs_info->scrubs_paused); | |
387 | mutex_unlock(&fs_info->scrub_lock); | |
388 | atomic_dec(&sctx->workers_pending); | |
389 | wake_up(&fs_info->scrub_pause_wait); | |
390 | wake_up(&sctx->list_wait); | |
391 | } | |
392 | ||
d9d181c1 | 393 | static void scrub_free_csums(struct scrub_ctx *sctx) |
a2de733c | 394 | { |
d9d181c1 | 395 | while (!list_empty(&sctx->csum_list)) { |
a2de733c | 396 | struct btrfs_ordered_sum *sum; |
d9d181c1 | 397 | sum = list_first_entry(&sctx->csum_list, |
a2de733c AJ |
398 | struct btrfs_ordered_sum, list); |
399 | list_del(&sum->list); | |
400 | kfree(sum); | |
401 | } | |
402 | } | |
403 | ||
d9d181c1 | 404 | static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) |
a2de733c AJ |
405 | { |
406 | int i; | |
a2de733c | 407 | |
d9d181c1 | 408 | if (!sctx) |
a2de733c AJ |
409 | return; |
410 | ||
ff023aac SB |
411 | scrub_free_wr_ctx(&sctx->wr_ctx); |
412 | ||
b5d67f64 | 413 | /* this can happen when scrub is cancelled */ |
d9d181c1 SB |
414 | if (sctx->curr != -1) { |
415 | struct scrub_bio *sbio = sctx->bios[sctx->curr]; | |
b5d67f64 SB |
416 | |
417 | for (i = 0; i < sbio->page_count; i++) { | |
ff023aac | 418 | WARN_ON(!sbio->pagev[i]->page); |
b5d67f64 SB |
419 | scrub_block_put(sbio->pagev[i]->sblock); |
420 | } | |
421 | bio_put(sbio->bio); | |
422 | } | |
423 | ||
ff023aac | 424 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
d9d181c1 | 425 | struct scrub_bio *sbio = sctx->bios[i]; |
a2de733c AJ |
426 | |
427 | if (!sbio) | |
428 | break; | |
a2de733c AJ |
429 | kfree(sbio); |
430 | } | |
431 | ||
d9d181c1 SB |
432 | scrub_free_csums(sctx); |
433 | kfree(sctx); | |
a2de733c AJ |
434 | } |
435 | ||
436 | static noinline_for_stack | |
63a212ab | 437 | struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace) |
a2de733c | 438 | { |
d9d181c1 | 439 | struct scrub_ctx *sctx; |
a2de733c | 440 | int i; |
a2de733c | 441 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
ff023aac SB |
442 | int pages_per_rd_bio; |
443 | int ret; | |
a2de733c | 444 | |
ff023aac SB |
445 | /* |
446 | * the setting of pages_per_rd_bio is correct for scrub but might | |
447 | * be wrong for the dev_replace code where we might read from | |
448 | * different devices in the initial huge bios. However, that | |
449 | * code is able to correctly handle the case when adding a page | |
450 | * to a bio fails. | |
451 | */ | |
452 | if (dev->bdev) | |
453 | pages_per_rd_bio = min_t(int, SCRUB_PAGES_PER_RD_BIO, | |
454 | bio_get_nr_vecs(dev->bdev)); | |
455 | else | |
456 | pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; | |
d9d181c1 SB |
457 | sctx = kzalloc(sizeof(*sctx), GFP_NOFS); |
458 | if (!sctx) | |
a2de733c | 459 | goto nomem; |
63a212ab | 460 | sctx->is_dev_replace = is_dev_replace; |
ff023aac | 461 | sctx->pages_per_rd_bio = pages_per_rd_bio; |
d9d181c1 | 462 | sctx->curr = -1; |
a36cf8b8 | 463 | sctx->dev_root = dev->dev_root; |
ff023aac | 464 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
a2de733c AJ |
465 | struct scrub_bio *sbio; |
466 | ||
467 | sbio = kzalloc(sizeof(*sbio), GFP_NOFS); | |
468 | if (!sbio) | |
469 | goto nomem; | |
d9d181c1 | 470 | sctx->bios[i] = sbio; |
a2de733c | 471 | |
a2de733c | 472 | sbio->index = i; |
d9d181c1 | 473 | sbio->sctx = sctx; |
b5d67f64 | 474 | sbio->page_count = 0; |
9e0af237 LB |
475 | btrfs_init_work(&sbio->work, btrfs_scrub_helper, |
476 | scrub_bio_end_io_worker, NULL, NULL); | |
a2de733c | 477 | |
ff023aac | 478 | if (i != SCRUB_BIOS_PER_SCTX - 1) |
d9d181c1 | 479 | sctx->bios[i]->next_free = i + 1; |
0ef8e451 | 480 | else |
d9d181c1 SB |
481 | sctx->bios[i]->next_free = -1; |
482 | } | |
483 | sctx->first_free = 0; | |
484 | sctx->nodesize = dev->dev_root->nodesize; | |
d9d181c1 | 485 | sctx->sectorsize = dev->dev_root->sectorsize; |
b6bfebc1 SB |
486 | atomic_set(&sctx->bios_in_flight, 0); |
487 | atomic_set(&sctx->workers_pending, 0); | |
d9d181c1 SB |
488 | atomic_set(&sctx->cancel_req, 0); |
489 | sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
490 | INIT_LIST_HEAD(&sctx->csum_list); | |
491 | ||
492 | spin_lock_init(&sctx->list_lock); | |
493 | spin_lock_init(&sctx->stat_lock); | |
494 | init_waitqueue_head(&sctx->list_wait); | |
ff023aac SB |
495 | |
496 | ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info, | |
497 | fs_info->dev_replace.tgtdev, is_dev_replace); | |
498 | if (ret) { | |
499 | scrub_free_ctx(sctx); | |
500 | return ERR_PTR(ret); | |
501 | } | |
d9d181c1 | 502 | return sctx; |
a2de733c AJ |
503 | |
504 | nomem: | |
d9d181c1 | 505 | scrub_free_ctx(sctx); |
a2de733c AJ |
506 | return ERR_PTR(-ENOMEM); |
507 | } | |
508 | ||
ff023aac SB |
509 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, |
510 | void *warn_ctx) | |
558540c1 JS |
511 | { |
512 | u64 isize; | |
513 | u32 nlink; | |
514 | int ret; | |
515 | int i; | |
516 | struct extent_buffer *eb; | |
517 | struct btrfs_inode_item *inode_item; | |
ff023aac | 518 | struct scrub_warning *swarn = warn_ctx; |
558540c1 JS |
519 | struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; |
520 | struct inode_fs_paths *ipath = NULL; | |
521 | struct btrfs_root *local_root; | |
522 | struct btrfs_key root_key; | |
523 | ||
524 | root_key.objectid = root; | |
525 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
526 | root_key.offset = (u64)-1; | |
527 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
528 | if (IS_ERR(local_root)) { | |
529 | ret = PTR_ERR(local_root); | |
530 | goto err; | |
531 | } | |
532 | ||
533 | ret = inode_item_info(inum, 0, local_root, swarn->path); | |
534 | if (ret) { | |
535 | btrfs_release_path(swarn->path); | |
536 | goto err; | |
537 | } | |
538 | ||
539 | eb = swarn->path->nodes[0]; | |
540 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], | |
541 | struct btrfs_inode_item); | |
542 | isize = btrfs_inode_size(eb, inode_item); | |
543 | nlink = btrfs_inode_nlink(eb, inode_item); | |
544 | btrfs_release_path(swarn->path); | |
545 | ||
546 | ipath = init_ipath(4096, local_root, swarn->path); | |
26bdef54 DC |
547 | if (IS_ERR(ipath)) { |
548 | ret = PTR_ERR(ipath); | |
549 | ipath = NULL; | |
550 | goto err; | |
551 | } | |
558540c1 JS |
552 | ret = paths_from_inode(inum, ipath); |
553 | ||
554 | if (ret < 0) | |
555 | goto err; | |
556 | ||
557 | /* | |
558 | * we deliberately ignore the bit ipath might have been too small to | |
559 | * hold all of the paths here | |
560 | */ | |
561 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) | |
efe120a0 | 562 | printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev " |
558540c1 JS |
563 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " |
564 | "length %llu, links %u (path: %s)\n", swarn->errstr, | |
606686ee | 565 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
566 | (unsigned long long)swarn->sector, root, inum, offset, |
567 | min(isize - offset, (u64)PAGE_SIZE), nlink, | |
745c4d8e | 568 | (char *)(unsigned long)ipath->fspath->val[i]); |
558540c1 JS |
569 | |
570 | free_ipath(ipath); | |
571 | return 0; | |
572 | ||
573 | err: | |
efe120a0 | 574 | printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev " |
558540c1 JS |
575 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " |
576 | "resolving failed with ret=%d\n", swarn->errstr, | |
606686ee | 577 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
578 | (unsigned long long)swarn->sector, root, inum, offset, ret); |
579 | ||
580 | free_ipath(ipath); | |
581 | return 0; | |
582 | } | |
583 | ||
b5d67f64 | 584 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
558540c1 | 585 | { |
a36cf8b8 SB |
586 | struct btrfs_device *dev; |
587 | struct btrfs_fs_info *fs_info; | |
558540c1 JS |
588 | struct btrfs_path *path; |
589 | struct btrfs_key found_key; | |
590 | struct extent_buffer *eb; | |
591 | struct btrfs_extent_item *ei; | |
592 | struct scrub_warning swarn; | |
69917e43 LB |
593 | unsigned long ptr = 0; |
594 | u64 extent_item_pos; | |
595 | u64 flags = 0; | |
558540c1 | 596 | u64 ref_root; |
69917e43 | 597 | u32 item_size; |
558540c1 | 598 | u8 ref_level; |
69917e43 | 599 | int ret; |
558540c1 | 600 | |
a36cf8b8 | 601 | WARN_ON(sblock->page_count < 1); |
7a9e9987 | 602 | dev = sblock->pagev[0]->dev; |
a36cf8b8 SB |
603 | fs_info = sblock->sctx->dev_root->fs_info; |
604 | ||
558540c1 | 605 | path = btrfs_alloc_path(); |
8b9456da DS |
606 | if (!path) |
607 | return; | |
558540c1 | 608 | |
7a9e9987 SB |
609 | swarn.sector = (sblock->pagev[0]->physical) >> 9; |
610 | swarn.logical = sblock->pagev[0]->logical; | |
558540c1 | 611 | swarn.errstr = errstr; |
a36cf8b8 | 612 | swarn.dev = NULL; |
558540c1 | 613 | |
69917e43 LB |
614 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, |
615 | &flags); | |
558540c1 JS |
616 | if (ret < 0) |
617 | goto out; | |
618 | ||
4692cf58 | 619 | extent_item_pos = swarn.logical - found_key.objectid; |
558540c1 JS |
620 | swarn.extent_item_size = found_key.offset; |
621 | ||
622 | eb = path->nodes[0]; | |
623 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); | |
624 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
625 | ||
69917e43 | 626 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
558540c1 | 627 | do { |
6eda71d0 LB |
628 | ret = tree_backref_for_extent(&ptr, eb, &found_key, ei, |
629 | item_size, &ref_root, | |
630 | &ref_level); | |
606686ee | 631 | printk_in_rcu(KERN_WARNING |
efe120a0 | 632 | "BTRFS: %s at logical %llu on dev %s, " |
558540c1 | 633 | "sector %llu: metadata %s (level %d) in tree " |
606686ee JB |
634 | "%llu\n", errstr, swarn.logical, |
635 | rcu_str_deref(dev->name), | |
558540c1 JS |
636 | (unsigned long long)swarn.sector, |
637 | ref_level ? "node" : "leaf", | |
638 | ret < 0 ? -1 : ref_level, | |
639 | ret < 0 ? -1 : ref_root); | |
640 | } while (ret != 1); | |
d8fe29e9 | 641 | btrfs_release_path(path); |
558540c1 | 642 | } else { |
d8fe29e9 | 643 | btrfs_release_path(path); |
558540c1 | 644 | swarn.path = path; |
a36cf8b8 | 645 | swarn.dev = dev; |
7a3ae2f8 JS |
646 | iterate_extent_inodes(fs_info, found_key.objectid, |
647 | extent_item_pos, 1, | |
558540c1 JS |
648 | scrub_print_warning_inode, &swarn); |
649 | } | |
650 | ||
651 | out: | |
652 | btrfs_free_path(path); | |
558540c1 JS |
653 | } |
654 | ||
ff023aac | 655 | static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx) |
0ef8e451 | 656 | { |
5da6fcbc | 657 | struct page *page = NULL; |
0ef8e451 | 658 | unsigned long index; |
ff023aac | 659 | struct scrub_fixup_nodatasum *fixup = fixup_ctx; |
0ef8e451 | 660 | int ret; |
5da6fcbc | 661 | int corrected = 0; |
0ef8e451 | 662 | struct btrfs_key key; |
5da6fcbc | 663 | struct inode *inode = NULL; |
6f1c3605 | 664 | struct btrfs_fs_info *fs_info; |
0ef8e451 JS |
665 | u64 end = offset + PAGE_SIZE - 1; |
666 | struct btrfs_root *local_root; | |
6f1c3605 | 667 | int srcu_index; |
0ef8e451 JS |
668 | |
669 | key.objectid = root; | |
670 | key.type = BTRFS_ROOT_ITEM_KEY; | |
671 | key.offset = (u64)-1; | |
6f1c3605 LB |
672 | |
673 | fs_info = fixup->root->fs_info; | |
674 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
675 | ||
676 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
677 | if (IS_ERR(local_root)) { | |
678 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 | 679 | return PTR_ERR(local_root); |
6f1c3605 | 680 | } |
0ef8e451 JS |
681 | |
682 | key.type = BTRFS_INODE_ITEM_KEY; | |
683 | key.objectid = inum; | |
684 | key.offset = 0; | |
6f1c3605 LB |
685 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); |
686 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 JS |
687 | if (IS_ERR(inode)) |
688 | return PTR_ERR(inode); | |
689 | ||
0ef8e451 JS |
690 | index = offset >> PAGE_CACHE_SHIFT; |
691 | ||
692 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
5da6fcbc JS |
693 | if (!page) { |
694 | ret = -ENOMEM; | |
695 | goto out; | |
696 | } | |
697 | ||
698 | if (PageUptodate(page)) { | |
5da6fcbc JS |
699 | if (PageDirty(page)) { |
700 | /* | |
701 | * we need to write the data to the defect sector. the | |
702 | * data that was in that sector is not in memory, | |
703 | * because the page was modified. we must not write the | |
704 | * modified page to that sector. | |
705 | * | |
706 | * TODO: what could be done here: wait for the delalloc | |
707 | * runner to write out that page (might involve | |
708 | * COW) and see whether the sector is still | |
709 | * referenced afterwards. | |
710 | * | |
711 | * For the meantime, we'll treat this error | |
712 | * incorrectable, although there is a chance that a | |
713 | * later scrub will find the bad sector again and that | |
714 | * there's no dirty page in memory, then. | |
715 | */ | |
716 | ret = -EIO; | |
717 | goto out; | |
718 | } | |
1203b681 | 719 | ret = repair_io_failure(inode, offset, PAGE_SIZE, |
5da6fcbc | 720 | fixup->logical, page, |
ffdd2018 | 721 | offset - page_offset(page), |
5da6fcbc JS |
722 | fixup->mirror_num); |
723 | unlock_page(page); | |
724 | corrected = !ret; | |
725 | } else { | |
726 | /* | |
727 | * we need to get good data first. the general readpage path | |
728 | * will call repair_io_failure for us, we just have to make | |
729 | * sure we read the bad mirror. | |
730 | */ | |
731 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
732 | EXTENT_DAMAGED, GFP_NOFS); | |
733 | if (ret) { | |
734 | /* set_extent_bits should give proper error */ | |
735 | WARN_ON(ret > 0); | |
736 | if (ret > 0) | |
737 | ret = -EFAULT; | |
738 | goto out; | |
739 | } | |
740 | ||
741 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, | |
742 | btrfs_get_extent, | |
743 | fixup->mirror_num); | |
744 | wait_on_page_locked(page); | |
745 | ||
746 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, | |
747 | end, EXTENT_DAMAGED, 0, NULL); | |
748 | if (!corrected) | |
749 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
750 | EXTENT_DAMAGED, GFP_NOFS); | |
751 | } | |
752 | ||
753 | out: | |
754 | if (page) | |
755 | put_page(page); | |
7fb18a06 TK |
756 | |
757 | iput(inode); | |
0ef8e451 JS |
758 | |
759 | if (ret < 0) | |
760 | return ret; | |
761 | ||
762 | if (ret == 0 && corrected) { | |
763 | /* | |
764 | * we only need to call readpage for one of the inodes belonging | |
765 | * to this extent. so make iterate_extent_inodes stop | |
766 | */ | |
767 | return 1; | |
768 | } | |
769 | ||
770 | return -EIO; | |
771 | } | |
772 | ||
773 | static void scrub_fixup_nodatasum(struct btrfs_work *work) | |
774 | { | |
775 | int ret; | |
776 | struct scrub_fixup_nodatasum *fixup; | |
d9d181c1 | 777 | struct scrub_ctx *sctx; |
0ef8e451 | 778 | struct btrfs_trans_handle *trans = NULL; |
0ef8e451 JS |
779 | struct btrfs_path *path; |
780 | int uncorrectable = 0; | |
781 | ||
782 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); | |
d9d181c1 | 783 | sctx = fixup->sctx; |
0ef8e451 JS |
784 | |
785 | path = btrfs_alloc_path(); | |
786 | if (!path) { | |
d9d181c1 SB |
787 | spin_lock(&sctx->stat_lock); |
788 | ++sctx->stat.malloc_errors; | |
789 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
790 | uncorrectable = 1; |
791 | goto out; | |
792 | } | |
793 | ||
794 | trans = btrfs_join_transaction(fixup->root); | |
795 | if (IS_ERR(trans)) { | |
796 | uncorrectable = 1; | |
797 | goto out; | |
798 | } | |
799 | ||
800 | /* | |
801 | * the idea is to trigger a regular read through the standard path. we | |
802 | * read a page from the (failed) logical address by specifying the | |
803 | * corresponding copynum of the failed sector. thus, that readpage is | |
804 | * expected to fail. | |
805 | * that is the point where on-the-fly error correction will kick in | |
806 | * (once it's finished) and rewrite the failed sector if a good copy | |
807 | * can be found. | |
808 | */ | |
809 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, | |
810 | path, scrub_fixup_readpage, | |
811 | fixup); | |
812 | if (ret < 0) { | |
813 | uncorrectable = 1; | |
814 | goto out; | |
815 | } | |
816 | WARN_ON(ret != 1); | |
817 | ||
d9d181c1 SB |
818 | spin_lock(&sctx->stat_lock); |
819 | ++sctx->stat.corrected_errors; | |
820 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
821 | |
822 | out: | |
823 | if (trans && !IS_ERR(trans)) | |
824 | btrfs_end_transaction(trans, fixup->root); | |
825 | if (uncorrectable) { | |
d9d181c1 SB |
826 | spin_lock(&sctx->stat_lock); |
827 | ++sctx->stat.uncorrectable_errors; | |
828 | spin_unlock(&sctx->stat_lock); | |
ff023aac SB |
829 | btrfs_dev_replace_stats_inc( |
830 | &sctx->dev_root->fs_info->dev_replace. | |
831 | num_uncorrectable_read_errors); | |
efe120a0 FH |
832 | printk_ratelimited_in_rcu(KERN_ERR "BTRFS: " |
833 | "unable to fixup (nodatasum) error at logical %llu on dev %s\n", | |
c1c9ff7c | 834 | fixup->logical, rcu_str_deref(fixup->dev->name)); |
0ef8e451 JS |
835 | } |
836 | ||
837 | btrfs_free_path(path); | |
838 | kfree(fixup); | |
839 | ||
b6bfebc1 | 840 | scrub_pending_trans_workers_dec(sctx); |
0ef8e451 JS |
841 | } |
842 | ||
af8e2d1d MX |
843 | static inline void scrub_get_recover(struct scrub_recover *recover) |
844 | { | |
845 | atomic_inc(&recover->refs); | |
846 | } | |
847 | ||
848 | static inline void scrub_put_recover(struct scrub_recover *recover) | |
849 | { | |
850 | if (atomic_dec_and_test(&recover->refs)) { | |
851 | kfree(recover->bbio); | |
852 | kfree(recover->raid_map); | |
853 | kfree(recover); | |
854 | } | |
855 | } | |
856 | ||
a2de733c | 857 | /* |
b5d67f64 SB |
858 | * scrub_handle_errored_block gets called when either verification of the |
859 | * pages failed or the bio failed to read, e.g. with EIO. In the latter | |
860 | * case, this function handles all pages in the bio, even though only one | |
861 | * may be bad. | |
862 | * The goal of this function is to repair the errored block by using the | |
863 | * contents of one of the mirrors. | |
a2de733c | 864 | */ |
b5d67f64 | 865 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
a2de733c | 866 | { |
d9d181c1 | 867 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
a36cf8b8 | 868 | struct btrfs_device *dev; |
b5d67f64 SB |
869 | struct btrfs_fs_info *fs_info; |
870 | u64 length; | |
871 | u64 logical; | |
872 | u64 generation; | |
873 | unsigned int failed_mirror_index; | |
874 | unsigned int is_metadata; | |
875 | unsigned int have_csum; | |
876 | u8 *csum; | |
877 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ | |
878 | struct scrub_block *sblock_bad; | |
879 | int ret; | |
880 | int mirror_index; | |
881 | int page_num; | |
882 | int success; | |
558540c1 | 883 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
b5d67f64 SB |
884 | DEFAULT_RATELIMIT_BURST); |
885 | ||
886 | BUG_ON(sblock_to_check->page_count < 1); | |
a36cf8b8 | 887 | fs_info = sctx->dev_root->fs_info; |
4ded4f63 SB |
888 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
889 | /* | |
890 | * if we find an error in a super block, we just report it. | |
891 | * They will get written with the next transaction commit | |
892 | * anyway | |
893 | */ | |
894 | spin_lock(&sctx->stat_lock); | |
895 | ++sctx->stat.super_errors; | |
896 | spin_unlock(&sctx->stat_lock); | |
897 | return 0; | |
898 | } | |
b5d67f64 | 899 | length = sblock_to_check->page_count * PAGE_SIZE; |
7a9e9987 SB |
900 | logical = sblock_to_check->pagev[0]->logical; |
901 | generation = sblock_to_check->pagev[0]->generation; | |
902 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); | |
903 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; | |
904 | is_metadata = !(sblock_to_check->pagev[0]->flags & | |
b5d67f64 | 905 | BTRFS_EXTENT_FLAG_DATA); |
7a9e9987 SB |
906 | have_csum = sblock_to_check->pagev[0]->have_csum; |
907 | csum = sblock_to_check->pagev[0]->csum; | |
908 | dev = sblock_to_check->pagev[0]->dev; | |
13db62b7 | 909 | |
ff023aac SB |
910 | if (sctx->is_dev_replace && !is_metadata && !have_csum) { |
911 | sblocks_for_recheck = NULL; | |
912 | goto nodatasum_case; | |
913 | } | |
914 | ||
b5d67f64 SB |
915 | /* |
916 | * read all mirrors one after the other. This includes to | |
917 | * re-read the extent or metadata block that failed (that was | |
918 | * the cause that this fixup code is called) another time, | |
919 | * page by page this time in order to know which pages | |
920 | * caused I/O errors and which ones are good (for all mirrors). | |
921 | * It is the goal to handle the situation when more than one | |
922 | * mirror contains I/O errors, but the errors do not | |
923 | * overlap, i.e. the data can be repaired by selecting the | |
924 | * pages from those mirrors without I/O error on the | |
925 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) | |
926 | * would be that mirror #1 has an I/O error on the first page, | |
927 | * the second page is good, and mirror #2 has an I/O error on | |
928 | * the second page, but the first page is good. | |
929 | * Then the first page of the first mirror can be repaired by | |
930 | * taking the first page of the second mirror, and the | |
931 | * second page of the second mirror can be repaired by | |
932 | * copying the contents of the 2nd page of the 1st mirror. | |
933 | * One more note: if the pages of one mirror contain I/O | |
934 | * errors, the checksum cannot be verified. In order to get | |
935 | * the best data for repairing, the first attempt is to find | |
936 | * a mirror without I/O errors and with a validated checksum. | |
937 | * Only if this is not possible, the pages are picked from | |
938 | * mirrors with I/O errors without considering the checksum. | |
939 | * If the latter is the case, at the end, the checksum of the | |
940 | * repaired area is verified in order to correctly maintain | |
941 | * the statistics. | |
942 | */ | |
943 | ||
944 | sblocks_for_recheck = kzalloc(BTRFS_MAX_MIRRORS * | |
945 | sizeof(*sblocks_for_recheck), | |
946 | GFP_NOFS); | |
947 | if (!sblocks_for_recheck) { | |
d9d181c1 SB |
948 | spin_lock(&sctx->stat_lock); |
949 | sctx->stat.malloc_errors++; | |
950 | sctx->stat.read_errors++; | |
951 | sctx->stat.uncorrectable_errors++; | |
952 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 953 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 954 | goto out; |
a2de733c AJ |
955 | } |
956 | ||
b5d67f64 | 957 | /* setup the context, map the logical blocks and alloc the pages */ |
ff023aac | 958 | ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length, |
b5d67f64 SB |
959 | logical, sblocks_for_recheck); |
960 | if (ret) { | |
d9d181c1 SB |
961 | spin_lock(&sctx->stat_lock); |
962 | sctx->stat.read_errors++; | |
963 | sctx->stat.uncorrectable_errors++; | |
964 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 965 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 SB |
966 | goto out; |
967 | } | |
968 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); | |
969 | sblock_bad = sblocks_for_recheck + failed_mirror_index; | |
13db62b7 | 970 | |
b5d67f64 | 971 | /* build and submit the bios for the failed mirror, check checksums */ |
34f5c8e9 | 972 | scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum, |
af8e2d1d | 973 | csum, generation, sctx->csum_size, 1); |
a2de733c | 974 | |
b5d67f64 SB |
975 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
976 | sblock_bad->no_io_error_seen) { | |
977 | /* | |
978 | * the error disappeared after reading page by page, or | |
979 | * the area was part of a huge bio and other parts of the | |
980 | * bio caused I/O errors, or the block layer merged several | |
981 | * read requests into one and the error is caused by a | |
982 | * different bio (usually one of the two latter cases is | |
983 | * the cause) | |
984 | */ | |
d9d181c1 SB |
985 | spin_lock(&sctx->stat_lock); |
986 | sctx->stat.unverified_errors++; | |
5a6ac9ea | 987 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 988 | spin_unlock(&sctx->stat_lock); |
a2de733c | 989 | |
ff023aac SB |
990 | if (sctx->is_dev_replace) |
991 | scrub_write_block_to_dev_replace(sblock_bad); | |
b5d67f64 | 992 | goto out; |
a2de733c | 993 | } |
a2de733c | 994 | |
b5d67f64 | 995 | if (!sblock_bad->no_io_error_seen) { |
d9d181c1 SB |
996 | spin_lock(&sctx->stat_lock); |
997 | sctx->stat.read_errors++; | |
998 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
999 | if (__ratelimit(&_rs)) |
1000 | scrub_print_warning("i/o error", sblock_to_check); | |
a36cf8b8 | 1001 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 1002 | } else if (sblock_bad->checksum_error) { |
d9d181c1 SB |
1003 | spin_lock(&sctx->stat_lock); |
1004 | sctx->stat.csum_errors++; | |
1005 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
1006 | if (__ratelimit(&_rs)) |
1007 | scrub_print_warning("checksum error", sblock_to_check); | |
a36cf8b8 | 1008 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 1009 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 1010 | } else if (sblock_bad->header_error) { |
d9d181c1 SB |
1011 | spin_lock(&sctx->stat_lock); |
1012 | sctx->stat.verify_errors++; | |
1013 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
1014 | if (__ratelimit(&_rs)) |
1015 | scrub_print_warning("checksum/header error", | |
1016 | sblock_to_check); | |
442a4f63 | 1017 | if (sblock_bad->generation_error) |
a36cf8b8 | 1018 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 SB |
1019 | BTRFS_DEV_STAT_GENERATION_ERRS); |
1020 | else | |
a36cf8b8 | 1021 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 1022 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 1023 | } |
a2de733c | 1024 | |
33ef30ad ID |
1025 | if (sctx->readonly) { |
1026 | ASSERT(!sctx->is_dev_replace); | |
1027 | goto out; | |
1028 | } | |
a2de733c | 1029 | |
b5d67f64 SB |
1030 | if (!is_metadata && !have_csum) { |
1031 | struct scrub_fixup_nodatasum *fixup_nodatasum; | |
a2de733c | 1032 | |
ff023aac SB |
1033 | nodatasum_case: |
1034 | WARN_ON(sctx->is_dev_replace); | |
1035 | ||
b5d67f64 SB |
1036 | /* |
1037 | * !is_metadata and !have_csum, this means that the data | |
1038 | * might not be COW'ed, that it might be modified | |
1039 | * concurrently. The general strategy to work on the | |
1040 | * commit root does not help in the case when COW is not | |
1041 | * used. | |
1042 | */ | |
1043 | fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS); | |
1044 | if (!fixup_nodatasum) | |
1045 | goto did_not_correct_error; | |
d9d181c1 | 1046 | fixup_nodatasum->sctx = sctx; |
a36cf8b8 | 1047 | fixup_nodatasum->dev = dev; |
b5d67f64 SB |
1048 | fixup_nodatasum->logical = logical; |
1049 | fixup_nodatasum->root = fs_info->extent_root; | |
1050 | fixup_nodatasum->mirror_num = failed_mirror_index + 1; | |
b6bfebc1 | 1051 | scrub_pending_trans_workers_inc(sctx); |
9e0af237 LB |
1052 | btrfs_init_work(&fixup_nodatasum->work, btrfs_scrub_helper, |
1053 | scrub_fixup_nodatasum, NULL, NULL); | |
0339ef2f QW |
1054 | btrfs_queue_work(fs_info->scrub_workers, |
1055 | &fixup_nodatasum->work); | |
b5d67f64 | 1056 | goto out; |
a2de733c AJ |
1057 | } |
1058 | ||
b5d67f64 SB |
1059 | /* |
1060 | * now build and submit the bios for the other mirrors, check | |
cb2ced73 SB |
1061 | * checksums. |
1062 | * First try to pick the mirror which is completely without I/O | |
b5d67f64 SB |
1063 | * errors and also does not have a checksum error. |
1064 | * If one is found, and if a checksum is present, the full block | |
1065 | * that is known to contain an error is rewritten. Afterwards | |
1066 | * the block is known to be corrected. | |
1067 | * If a mirror is found which is completely correct, and no | |
1068 | * checksum is present, only those pages are rewritten that had | |
1069 | * an I/O error in the block to be repaired, since it cannot be | |
1070 | * determined, which copy of the other pages is better (and it | |
1071 | * could happen otherwise that a correct page would be | |
1072 | * overwritten by a bad one). | |
1073 | */ | |
1074 | for (mirror_index = 0; | |
1075 | mirror_index < BTRFS_MAX_MIRRORS && | |
1076 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1077 | mirror_index++) { | |
cb2ced73 | 1078 | struct scrub_block *sblock_other; |
b5d67f64 | 1079 | |
cb2ced73 SB |
1080 | if (mirror_index == failed_mirror_index) |
1081 | continue; | |
1082 | sblock_other = sblocks_for_recheck + mirror_index; | |
1083 | ||
1084 | /* build and submit the bios, check checksums */ | |
34f5c8e9 SB |
1085 | scrub_recheck_block(fs_info, sblock_other, is_metadata, |
1086 | have_csum, csum, generation, | |
af8e2d1d | 1087 | sctx->csum_size, 0); |
34f5c8e9 SB |
1088 | |
1089 | if (!sblock_other->header_error && | |
b5d67f64 SB |
1090 | !sblock_other->checksum_error && |
1091 | sblock_other->no_io_error_seen) { | |
ff023aac SB |
1092 | if (sctx->is_dev_replace) { |
1093 | scrub_write_block_to_dev_replace(sblock_other); | |
1094 | } else { | |
1095 | int force_write = is_metadata || have_csum; | |
1096 | ||
1097 | ret = scrub_repair_block_from_good_copy( | |
1098 | sblock_bad, sblock_other, | |
1099 | force_write); | |
1100 | } | |
b5d67f64 SB |
1101 | if (0 == ret) |
1102 | goto corrected_error; | |
1103 | } | |
1104 | } | |
a2de733c AJ |
1105 | |
1106 | /* | |
ff023aac SB |
1107 | * for dev_replace, pick good pages and write to the target device. |
1108 | */ | |
1109 | if (sctx->is_dev_replace) { | |
1110 | success = 1; | |
1111 | for (page_num = 0; page_num < sblock_bad->page_count; | |
1112 | page_num++) { | |
1113 | int sub_success; | |
1114 | ||
1115 | sub_success = 0; | |
1116 | for (mirror_index = 0; | |
1117 | mirror_index < BTRFS_MAX_MIRRORS && | |
1118 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1119 | mirror_index++) { | |
1120 | struct scrub_block *sblock_other = | |
1121 | sblocks_for_recheck + mirror_index; | |
1122 | struct scrub_page *page_other = | |
1123 | sblock_other->pagev[page_num]; | |
1124 | ||
1125 | if (!page_other->io_error) { | |
1126 | ret = scrub_write_page_to_dev_replace( | |
1127 | sblock_other, page_num); | |
1128 | if (ret == 0) { | |
1129 | /* succeeded for this page */ | |
1130 | sub_success = 1; | |
1131 | break; | |
1132 | } else { | |
1133 | btrfs_dev_replace_stats_inc( | |
1134 | &sctx->dev_root-> | |
1135 | fs_info->dev_replace. | |
1136 | num_write_errors); | |
1137 | } | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | if (!sub_success) { | |
1142 | /* | |
1143 | * did not find a mirror to fetch the page | |
1144 | * from. scrub_write_page_to_dev_replace() | |
1145 | * handles this case (page->io_error), by | |
1146 | * filling the block with zeros before | |
1147 | * submitting the write request | |
1148 | */ | |
1149 | success = 0; | |
1150 | ret = scrub_write_page_to_dev_replace( | |
1151 | sblock_bad, page_num); | |
1152 | if (ret) | |
1153 | btrfs_dev_replace_stats_inc( | |
1154 | &sctx->dev_root->fs_info-> | |
1155 | dev_replace.num_write_errors); | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | goto out; | |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * for regular scrub, repair those pages that are errored. | |
1164 | * In case of I/O errors in the area that is supposed to be | |
b5d67f64 SB |
1165 | * repaired, continue by picking good copies of those pages. |
1166 | * Select the good pages from mirrors to rewrite bad pages from | |
1167 | * the area to fix. Afterwards verify the checksum of the block | |
1168 | * that is supposed to be repaired. This verification step is | |
1169 | * only done for the purpose of statistic counting and for the | |
1170 | * final scrub report, whether errors remain. | |
1171 | * A perfect algorithm could make use of the checksum and try | |
1172 | * all possible combinations of pages from the different mirrors | |
1173 | * until the checksum verification succeeds. For example, when | |
1174 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page | |
1175 | * of mirror #2 is readable but the final checksum test fails, | |
1176 | * then the 2nd page of mirror #3 could be tried, whether now | |
1177 | * the final checksum succeedes. But this would be a rare | |
1178 | * exception and is therefore not implemented. At least it is | |
1179 | * avoided that the good copy is overwritten. | |
1180 | * A more useful improvement would be to pick the sectors | |
1181 | * without I/O error based on sector sizes (512 bytes on legacy | |
1182 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one | |
1183 | * mirror could be repaired by taking 512 byte of a different | |
1184 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE | |
1185 | * area are unreadable. | |
a2de733c | 1186 | */ |
a2de733c | 1187 | |
b5d67f64 SB |
1188 | /* can only fix I/O errors from here on */ |
1189 | if (sblock_bad->no_io_error_seen) | |
1190 | goto did_not_correct_error; | |
1191 | ||
1192 | success = 1; | |
1193 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { | |
7a9e9987 | 1194 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
b5d67f64 SB |
1195 | |
1196 | if (!page_bad->io_error) | |
a2de733c | 1197 | continue; |
b5d67f64 SB |
1198 | |
1199 | for (mirror_index = 0; | |
1200 | mirror_index < BTRFS_MAX_MIRRORS && | |
1201 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1202 | mirror_index++) { | |
1203 | struct scrub_block *sblock_other = sblocks_for_recheck + | |
1204 | mirror_index; | |
7a9e9987 SB |
1205 | struct scrub_page *page_other = sblock_other->pagev[ |
1206 | page_num]; | |
b5d67f64 SB |
1207 | |
1208 | if (!page_other->io_error) { | |
1209 | ret = scrub_repair_page_from_good_copy( | |
1210 | sblock_bad, sblock_other, page_num, 0); | |
1211 | if (0 == ret) { | |
1212 | page_bad->io_error = 0; | |
1213 | break; /* succeeded for this page */ | |
1214 | } | |
1215 | } | |
96e36920 | 1216 | } |
a2de733c | 1217 | |
b5d67f64 SB |
1218 | if (page_bad->io_error) { |
1219 | /* did not find a mirror to copy the page from */ | |
1220 | success = 0; | |
1221 | } | |
a2de733c | 1222 | } |
a2de733c | 1223 | |
b5d67f64 SB |
1224 | if (success) { |
1225 | if (is_metadata || have_csum) { | |
1226 | /* | |
1227 | * need to verify the checksum now that all | |
1228 | * sectors on disk are repaired (the write | |
1229 | * request for data to be repaired is on its way). | |
1230 | * Just be lazy and use scrub_recheck_block() | |
1231 | * which re-reads the data before the checksum | |
1232 | * is verified, but most likely the data comes out | |
1233 | * of the page cache. | |
1234 | */ | |
34f5c8e9 SB |
1235 | scrub_recheck_block(fs_info, sblock_bad, |
1236 | is_metadata, have_csum, csum, | |
af8e2d1d | 1237 | generation, sctx->csum_size, 1); |
34f5c8e9 | 1238 | if (!sblock_bad->header_error && |
b5d67f64 SB |
1239 | !sblock_bad->checksum_error && |
1240 | sblock_bad->no_io_error_seen) | |
1241 | goto corrected_error; | |
1242 | else | |
1243 | goto did_not_correct_error; | |
1244 | } else { | |
1245 | corrected_error: | |
d9d181c1 SB |
1246 | spin_lock(&sctx->stat_lock); |
1247 | sctx->stat.corrected_errors++; | |
5a6ac9ea | 1248 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 1249 | spin_unlock(&sctx->stat_lock); |
606686ee | 1250 | printk_ratelimited_in_rcu(KERN_ERR |
efe120a0 | 1251 | "BTRFS: fixed up error at logical %llu on dev %s\n", |
c1c9ff7c | 1252 | logical, rcu_str_deref(dev->name)); |
8628764e | 1253 | } |
b5d67f64 SB |
1254 | } else { |
1255 | did_not_correct_error: | |
d9d181c1 SB |
1256 | spin_lock(&sctx->stat_lock); |
1257 | sctx->stat.uncorrectable_errors++; | |
1258 | spin_unlock(&sctx->stat_lock); | |
606686ee | 1259 | printk_ratelimited_in_rcu(KERN_ERR |
efe120a0 | 1260 | "BTRFS: unable to fixup (regular) error at logical %llu on dev %s\n", |
c1c9ff7c | 1261 | logical, rcu_str_deref(dev->name)); |
96e36920 | 1262 | } |
a2de733c | 1263 | |
b5d67f64 SB |
1264 | out: |
1265 | if (sblocks_for_recheck) { | |
1266 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; | |
1267 | mirror_index++) { | |
1268 | struct scrub_block *sblock = sblocks_for_recheck + | |
1269 | mirror_index; | |
af8e2d1d | 1270 | struct scrub_recover *recover; |
b5d67f64 SB |
1271 | int page_index; |
1272 | ||
7a9e9987 SB |
1273 | for (page_index = 0; page_index < sblock->page_count; |
1274 | page_index++) { | |
1275 | sblock->pagev[page_index]->sblock = NULL; | |
af8e2d1d MX |
1276 | recover = sblock->pagev[page_index]->recover; |
1277 | if (recover) { | |
1278 | scrub_put_recover(recover); | |
1279 | sblock->pagev[page_index]->recover = | |
1280 | NULL; | |
1281 | } | |
7a9e9987 SB |
1282 | scrub_page_put(sblock->pagev[page_index]); |
1283 | } | |
b5d67f64 SB |
1284 | } |
1285 | kfree(sblocks_for_recheck); | |
1286 | } | |
a2de733c | 1287 | |
b5d67f64 SB |
1288 | return 0; |
1289 | } | |
a2de733c | 1290 | |
af8e2d1d MX |
1291 | static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio, u64 *raid_map) |
1292 | { | |
1293 | if (raid_map) { | |
1294 | if (raid_map[bbio->num_stripes - 1] == RAID6_Q_STRIPE) | |
1295 | return 3; | |
1296 | else | |
1297 | return 2; | |
1298 | } else { | |
1299 | return (int)bbio->num_stripes; | |
1300 | } | |
1301 | } | |
1302 | ||
1303 | static inline void scrub_stripe_index_and_offset(u64 logical, u64 *raid_map, | |
1304 | u64 mapped_length, | |
1305 | int nstripes, int mirror, | |
1306 | int *stripe_index, | |
1307 | u64 *stripe_offset) | |
1308 | { | |
1309 | int i; | |
1310 | ||
1311 | if (raid_map) { | |
1312 | /* RAID5/6 */ | |
1313 | for (i = 0; i < nstripes; i++) { | |
1314 | if (raid_map[i] == RAID6_Q_STRIPE || | |
1315 | raid_map[i] == RAID5_P_STRIPE) | |
1316 | continue; | |
1317 | ||
1318 | if (logical >= raid_map[i] && | |
1319 | logical < raid_map[i] + mapped_length) | |
1320 | break; | |
1321 | } | |
1322 | ||
1323 | *stripe_index = i; | |
1324 | *stripe_offset = logical - raid_map[i]; | |
1325 | } else { | |
1326 | /* The other RAID type */ | |
1327 | *stripe_index = mirror; | |
1328 | *stripe_offset = 0; | |
1329 | } | |
1330 | } | |
1331 | ||
d9d181c1 | 1332 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
3ec706c8 | 1333 | struct btrfs_fs_info *fs_info, |
ff023aac | 1334 | struct scrub_block *original_sblock, |
b5d67f64 SB |
1335 | u64 length, u64 logical, |
1336 | struct scrub_block *sblocks_for_recheck) | |
1337 | { | |
af8e2d1d MX |
1338 | struct scrub_recover *recover; |
1339 | struct btrfs_bio *bbio; | |
1340 | u64 *raid_map; | |
1341 | u64 sublen; | |
1342 | u64 mapped_length; | |
1343 | u64 stripe_offset; | |
1344 | int stripe_index; | |
b5d67f64 SB |
1345 | int page_index; |
1346 | int mirror_index; | |
af8e2d1d | 1347 | int nmirrors; |
b5d67f64 SB |
1348 | int ret; |
1349 | ||
1350 | /* | |
7a9e9987 | 1351 | * note: the two members ref_count and outstanding_pages |
b5d67f64 SB |
1352 | * are not used (and not set) in the blocks that are used for |
1353 | * the recheck procedure | |
1354 | */ | |
1355 | ||
1356 | page_index = 0; | |
1357 | while (length > 0) { | |
af8e2d1d MX |
1358 | sublen = min_t(u64, length, PAGE_SIZE); |
1359 | mapped_length = sublen; | |
1360 | bbio = NULL; | |
1361 | raid_map = NULL; | |
a2de733c | 1362 | |
b5d67f64 SB |
1363 | /* |
1364 | * with a length of PAGE_SIZE, each returned stripe | |
1365 | * represents one mirror | |
1366 | */ | |
af8e2d1d MX |
1367 | ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical, |
1368 | &mapped_length, &bbio, 0, &raid_map); | |
b5d67f64 SB |
1369 | if (ret || !bbio || mapped_length < sublen) { |
1370 | kfree(bbio); | |
af8e2d1d | 1371 | kfree(raid_map); |
b5d67f64 SB |
1372 | return -EIO; |
1373 | } | |
a2de733c | 1374 | |
af8e2d1d MX |
1375 | recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS); |
1376 | if (!recover) { | |
1377 | kfree(bbio); | |
1378 | kfree(raid_map); | |
1379 | return -ENOMEM; | |
1380 | } | |
1381 | ||
1382 | atomic_set(&recover->refs, 1); | |
1383 | recover->bbio = bbio; | |
1384 | recover->raid_map = raid_map; | |
1385 | recover->map_length = mapped_length; | |
1386 | ||
ff023aac | 1387 | BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO); |
af8e2d1d MX |
1388 | |
1389 | nmirrors = scrub_nr_raid_mirrors(bbio, raid_map); | |
1390 | for (mirror_index = 0; mirror_index < nmirrors; | |
b5d67f64 SB |
1391 | mirror_index++) { |
1392 | struct scrub_block *sblock; | |
1393 | struct scrub_page *page; | |
1394 | ||
1395 | if (mirror_index >= BTRFS_MAX_MIRRORS) | |
1396 | continue; | |
1397 | ||
1398 | sblock = sblocks_for_recheck + mirror_index; | |
7a9e9987 SB |
1399 | sblock->sctx = sctx; |
1400 | page = kzalloc(sizeof(*page), GFP_NOFS); | |
1401 | if (!page) { | |
1402 | leave_nomem: | |
d9d181c1 SB |
1403 | spin_lock(&sctx->stat_lock); |
1404 | sctx->stat.malloc_errors++; | |
1405 | spin_unlock(&sctx->stat_lock); | |
af8e2d1d | 1406 | scrub_put_recover(recover); |
b5d67f64 SB |
1407 | return -ENOMEM; |
1408 | } | |
7a9e9987 SB |
1409 | scrub_page_get(page); |
1410 | sblock->pagev[page_index] = page; | |
1411 | page->logical = logical; | |
af8e2d1d MX |
1412 | |
1413 | scrub_stripe_index_and_offset(logical, raid_map, | |
1414 | mapped_length, | |
1415 | bbio->num_stripes, | |
1416 | mirror_index, | |
1417 | &stripe_index, | |
1418 | &stripe_offset); | |
1419 | page->physical = bbio->stripes[stripe_index].physical + | |
1420 | stripe_offset; | |
1421 | page->dev = bbio->stripes[stripe_index].dev; | |
1422 | ||
ff023aac SB |
1423 | BUG_ON(page_index >= original_sblock->page_count); |
1424 | page->physical_for_dev_replace = | |
1425 | original_sblock->pagev[page_index]-> | |
1426 | physical_for_dev_replace; | |
7a9e9987 | 1427 | /* for missing devices, dev->bdev is NULL */ |
7a9e9987 | 1428 | page->mirror_num = mirror_index + 1; |
b5d67f64 | 1429 | sblock->page_count++; |
7a9e9987 SB |
1430 | page->page = alloc_page(GFP_NOFS); |
1431 | if (!page->page) | |
1432 | goto leave_nomem; | |
af8e2d1d MX |
1433 | |
1434 | scrub_get_recover(recover); | |
1435 | page->recover = recover; | |
b5d67f64 | 1436 | } |
af8e2d1d | 1437 | scrub_put_recover(recover); |
b5d67f64 SB |
1438 | length -= sublen; |
1439 | logical += sublen; | |
1440 | page_index++; | |
1441 | } | |
1442 | ||
1443 | return 0; | |
96e36920 ID |
1444 | } |
1445 | ||
af8e2d1d MX |
1446 | struct scrub_bio_ret { |
1447 | struct completion event; | |
1448 | int error; | |
1449 | }; | |
1450 | ||
1451 | static void scrub_bio_wait_endio(struct bio *bio, int error) | |
1452 | { | |
1453 | struct scrub_bio_ret *ret = bio->bi_private; | |
1454 | ||
1455 | ret->error = error; | |
1456 | complete(&ret->event); | |
1457 | } | |
1458 | ||
1459 | static inline int scrub_is_page_on_raid56(struct scrub_page *page) | |
1460 | { | |
1461 | return page->recover && page->recover->raid_map; | |
1462 | } | |
1463 | ||
1464 | static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info, | |
1465 | struct bio *bio, | |
1466 | struct scrub_page *page) | |
1467 | { | |
1468 | struct scrub_bio_ret done; | |
1469 | int ret; | |
1470 | ||
1471 | init_completion(&done.event); | |
1472 | done.error = 0; | |
1473 | bio->bi_iter.bi_sector = page->logical >> 9; | |
1474 | bio->bi_private = &done; | |
1475 | bio->bi_end_io = scrub_bio_wait_endio; | |
1476 | ||
1477 | ret = raid56_parity_recover(fs_info->fs_root, bio, page->recover->bbio, | |
1478 | page->recover->raid_map, | |
1479 | page->recover->map_length, | |
1480 | page->mirror_num, 1); | |
1481 | if (ret) | |
1482 | return ret; | |
1483 | ||
1484 | wait_for_completion(&done.event); | |
1485 | if (done.error) | |
1486 | return -EIO; | |
1487 | ||
1488 | return 0; | |
1489 | } | |
1490 | ||
b5d67f64 SB |
1491 | /* |
1492 | * this function will check the on disk data for checksum errors, header | |
1493 | * errors and read I/O errors. If any I/O errors happen, the exact pages | |
1494 | * which are errored are marked as being bad. The goal is to enable scrub | |
1495 | * to take those pages that are not errored from all the mirrors so that | |
1496 | * the pages that are errored in the just handled mirror can be repaired. | |
1497 | */ | |
34f5c8e9 SB |
1498 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
1499 | struct scrub_block *sblock, int is_metadata, | |
1500 | int have_csum, u8 *csum, u64 generation, | |
af8e2d1d | 1501 | u16 csum_size, int retry_failed_mirror) |
96e36920 | 1502 | { |
b5d67f64 | 1503 | int page_num; |
96e36920 | 1504 | |
b5d67f64 SB |
1505 | sblock->no_io_error_seen = 1; |
1506 | sblock->header_error = 0; | |
1507 | sblock->checksum_error = 0; | |
96e36920 | 1508 | |
b5d67f64 SB |
1509 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1510 | struct bio *bio; | |
7a9e9987 | 1511 | struct scrub_page *page = sblock->pagev[page_num]; |
b5d67f64 | 1512 | |
442a4f63 | 1513 | if (page->dev->bdev == NULL) { |
ea9947b4 SB |
1514 | page->io_error = 1; |
1515 | sblock->no_io_error_seen = 0; | |
1516 | continue; | |
1517 | } | |
1518 | ||
7a9e9987 | 1519 | WARN_ON(!page->page); |
9be3395b | 1520 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
34f5c8e9 SB |
1521 | if (!bio) { |
1522 | page->io_error = 1; | |
1523 | sblock->no_io_error_seen = 0; | |
1524 | continue; | |
1525 | } | |
442a4f63 | 1526 | bio->bi_bdev = page->dev->bdev; |
b5d67f64 | 1527 | |
34f5c8e9 | 1528 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
af8e2d1d MX |
1529 | if (!retry_failed_mirror && scrub_is_page_on_raid56(page)) { |
1530 | if (scrub_submit_raid56_bio_wait(fs_info, bio, page)) | |
1531 | sblock->no_io_error_seen = 0; | |
1532 | } else { | |
1533 | bio->bi_iter.bi_sector = page->physical >> 9; | |
1534 | ||
1535 | if (btrfsic_submit_bio_wait(READ, bio)) | |
1536 | sblock->no_io_error_seen = 0; | |
1537 | } | |
33879d45 | 1538 | |
b5d67f64 SB |
1539 | bio_put(bio); |
1540 | } | |
96e36920 | 1541 | |
b5d67f64 SB |
1542 | if (sblock->no_io_error_seen) |
1543 | scrub_recheck_block_checksum(fs_info, sblock, is_metadata, | |
1544 | have_csum, csum, generation, | |
1545 | csum_size); | |
1546 | ||
34f5c8e9 | 1547 | return; |
a2de733c AJ |
1548 | } |
1549 | ||
17a9be2f MX |
1550 | static inline int scrub_check_fsid(u8 fsid[], |
1551 | struct scrub_page *spage) | |
1552 | { | |
1553 | struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices; | |
1554 | int ret; | |
1555 | ||
1556 | ret = memcmp(fsid, fs_devices->fsid, BTRFS_UUID_SIZE); | |
1557 | return !ret; | |
1558 | } | |
1559 | ||
b5d67f64 SB |
1560 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
1561 | struct scrub_block *sblock, | |
1562 | int is_metadata, int have_csum, | |
1563 | const u8 *csum, u64 generation, | |
1564 | u16 csum_size) | |
a2de733c | 1565 | { |
b5d67f64 SB |
1566 | int page_num; |
1567 | u8 calculated_csum[BTRFS_CSUM_SIZE]; | |
1568 | u32 crc = ~(u32)0; | |
b5d67f64 SB |
1569 | void *mapped_buffer; |
1570 | ||
7a9e9987 | 1571 | WARN_ON(!sblock->pagev[0]->page); |
b5d67f64 SB |
1572 | if (is_metadata) { |
1573 | struct btrfs_header *h; | |
1574 | ||
7a9e9987 | 1575 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 SB |
1576 | h = (struct btrfs_header *)mapped_buffer; |
1577 | ||
3cae210f | 1578 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h) || |
17a9be2f | 1579 | !scrub_check_fsid(h->fsid, sblock->pagev[0]) || |
b5d67f64 | 1580 | memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, |
442a4f63 | 1581 | BTRFS_UUID_SIZE)) { |
b5d67f64 | 1582 | sblock->header_error = 1; |
3cae210f | 1583 | } else if (generation != btrfs_stack_header_generation(h)) { |
442a4f63 SB |
1584 | sblock->header_error = 1; |
1585 | sblock->generation_error = 1; | |
1586 | } | |
b5d67f64 SB |
1587 | csum = h->csum; |
1588 | } else { | |
1589 | if (!have_csum) | |
1590 | return; | |
a2de733c | 1591 | |
7a9e9987 | 1592 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 | 1593 | } |
a2de733c | 1594 | |
b5d67f64 SB |
1595 | for (page_num = 0;;) { |
1596 | if (page_num == 0 && is_metadata) | |
b0496686 | 1597 | crc = btrfs_csum_data( |
b5d67f64 SB |
1598 | ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE, |
1599 | crc, PAGE_SIZE - BTRFS_CSUM_SIZE); | |
1600 | else | |
b0496686 | 1601 | crc = btrfs_csum_data(mapped_buffer, crc, PAGE_SIZE); |
b5d67f64 | 1602 | |
9613bebb | 1603 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1604 | page_num++; |
1605 | if (page_num >= sblock->page_count) | |
1606 | break; | |
7a9e9987 | 1607 | WARN_ON(!sblock->pagev[page_num]->page); |
b5d67f64 | 1608 | |
7a9e9987 | 1609 | mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page); |
b5d67f64 SB |
1610 | } |
1611 | ||
1612 | btrfs_csum_final(crc, calculated_csum); | |
1613 | if (memcmp(calculated_csum, csum, csum_size)) | |
1614 | sblock->checksum_error = 1; | |
a2de733c AJ |
1615 | } |
1616 | ||
b5d67f64 SB |
1617 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
1618 | struct scrub_block *sblock_good, | |
1619 | int force_write) | |
1620 | { | |
1621 | int page_num; | |
1622 | int ret = 0; | |
96e36920 | 1623 | |
b5d67f64 SB |
1624 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
1625 | int ret_sub; | |
96e36920 | 1626 | |
b5d67f64 SB |
1627 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
1628 | sblock_good, | |
1629 | page_num, | |
1630 | force_write); | |
1631 | if (ret_sub) | |
1632 | ret = ret_sub; | |
a2de733c | 1633 | } |
b5d67f64 SB |
1634 | |
1635 | return ret; | |
1636 | } | |
1637 | ||
1638 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
1639 | struct scrub_block *sblock_good, | |
1640 | int page_num, int force_write) | |
1641 | { | |
7a9e9987 SB |
1642 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
1643 | struct scrub_page *page_good = sblock_good->pagev[page_num]; | |
b5d67f64 | 1644 | |
7a9e9987 SB |
1645 | BUG_ON(page_bad->page == NULL); |
1646 | BUG_ON(page_good->page == NULL); | |
b5d67f64 SB |
1647 | if (force_write || sblock_bad->header_error || |
1648 | sblock_bad->checksum_error || page_bad->io_error) { | |
1649 | struct bio *bio; | |
1650 | int ret; | |
b5d67f64 | 1651 | |
ff023aac | 1652 | if (!page_bad->dev->bdev) { |
efe120a0 FH |
1653 | printk_ratelimited(KERN_WARNING "BTRFS: " |
1654 | "scrub_repair_page_from_good_copy(bdev == NULL) " | |
1655 | "is unexpected!\n"); | |
ff023aac SB |
1656 | return -EIO; |
1657 | } | |
1658 | ||
9be3395b | 1659 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
e627ee7b TI |
1660 | if (!bio) |
1661 | return -EIO; | |
442a4f63 | 1662 | bio->bi_bdev = page_bad->dev->bdev; |
4f024f37 | 1663 | bio->bi_iter.bi_sector = page_bad->physical >> 9; |
b5d67f64 SB |
1664 | |
1665 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); | |
1666 | if (PAGE_SIZE != ret) { | |
1667 | bio_put(bio); | |
1668 | return -EIO; | |
13db62b7 | 1669 | } |
b5d67f64 | 1670 | |
33879d45 | 1671 | if (btrfsic_submit_bio_wait(WRITE, bio)) { |
442a4f63 SB |
1672 | btrfs_dev_stat_inc_and_print(page_bad->dev, |
1673 | BTRFS_DEV_STAT_WRITE_ERRS); | |
ff023aac SB |
1674 | btrfs_dev_replace_stats_inc( |
1675 | &sblock_bad->sctx->dev_root->fs_info-> | |
1676 | dev_replace.num_write_errors); | |
442a4f63 SB |
1677 | bio_put(bio); |
1678 | return -EIO; | |
1679 | } | |
b5d67f64 | 1680 | bio_put(bio); |
a2de733c AJ |
1681 | } |
1682 | ||
b5d67f64 SB |
1683 | return 0; |
1684 | } | |
1685 | ||
ff023aac SB |
1686 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
1687 | { | |
1688 | int page_num; | |
1689 | ||
5a6ac9ea MX |
1690 | /* |
1691 | * This block is used for the check of the parity on the source device, | |
1692 | * so the data needn't be written into the destination device. | |
1693 | */ | |
1694 | if (sblock->sparity) | |
1695 | return; | |
1696 | ||
ff023aac SB |
1697 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1698 | int ret; | |
1699 | ||
1700 | ret = scrub_write_page_to_dev_replace(sblock, page_num); | |
1701 | if (ret) | |
1702 | btrfs_dev_replace_stats_inc( | |
1703 | &sblock->sctx->dev_root->fs_info->dev_replace. | |
1704 | num_write_errors); | |
1705 | } | |
1706 | } | |
1707 | ||
1708 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
1709 | int page_num) | |
1710 | { | |
1711 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1712 | ||
1713 | BUG_ON(spage->page == NULL); | |
1714 | if (spage->io_error) { | |
1715 | void *mapped_buffer = kmap_atomic(spage->page); | |
1716 | ||
1717 | memset(mapped_buffer, 0, PAGE_CACHE_SIZE); | |
1718 | flush_dcache_page(spage->page); | |
1719 | kunmap_atomic(mapped_buffer); | |
1720 | } | |
1721 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); | |
1722 | } | |
1723 | ||
1724 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
1725 | struct scrub_page *spage) | |
1726 | { | |
1727 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1728 | struct scrub_bio *sbio; | |
1729 | int ret; | |
1730 | ||
1731 | mutex_lock(&wr_ctx->wr_lock); | |
1732 | again: | |
1733 | if (!wr_ctx->wr_curr_bio) { | |
1734 | wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio), | |
1735 | GFP_NOFS); | |
1736 | if (!wr_ctx->wr_curr_bio) { | |
1737 | mutex_unlock(&wr_ctx->wr_lock); | |
1738 | return -ENOMEM; | |
1739 | } | |
1740 | wr_ctx->wr_curr_bio->sctx = sctx; | |
1741 | wr_ctx->wr_curr_bio->page_count = 0; | |
1742 | } | |
1743 | sbio = wr_ctx->wr_curr_bio; | |
1744 | if (sbio->page_count == 0) { | |
1745 | struct bio *bio; | |
1746 | ||
1747 | sbio->physical = spage->physical_for_dev_replace; | |
1748 | sbio->logical = spage->logical; | |
1749 | sbio->dev = wr_ctx->tgtdev; | |
1750 | bio = sbio->bio; | |
1751 | if (!bio) { | |
9be3395b | 1752 | bio = btrfs_io_bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio); |
ff023aac SB |
1753 | if (!bio) { |
1754 | mutex_unlock(&wr_ctx->wr_lock); | |
1755 | return -ENOMEM; | |
1756 | } | |
1757 | sbio->bio = bio; | |
1758 | } | |
1759 | ||
1760 | bio->bi_private = sbio; | |
1761 | bio->bi_end_io = scrub_wr_bio_end_io; | |
1762 | bio->bi_bdev = sbio->dev->bdev; | |
4f024f37 | 1763 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
ff023aac SB |
1764 | sbio->err = 0; |
1765 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != | |
1766 | spage->physical_for_dev_replace || | |
1767 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
1768 | spage->logical) { | |
1769 | scrub_wr_submit(sctx); | |
1770 | goto again; | |
1771 | } | |
1772 | ||
1773 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1774 | if (ret != PAGE_SIZE) { | |
1775 | if (sbio->page_count < 1) { | |
1776 | bio_put(sbio->bio); | |
1777 | sbio->bio = NULL; | |
1778 | mutex_unlock(&wr_ctx->wr_lock); | |
1779 | return -EIO; | |
1780 | } | |
1781 | scrub_wr_submit(sctx); | |
1782 | goto again; | |
1783 | } | |
1784 | ||
1785 | sbio->pagev[sbio->page_count] = spage; | |
1786 | scrub_page_get(spage); | |
1787 | sbio->page_count++; | |
1788 | if (sbio->page_count == wr_ctx->pages_per_wr_bio) | |
1789 | scrub_wr_submit(sctx); | |
1790 | mutex_unlock(&wr_ctx->wr_lock); | |
1791 | ||
1792 | return 0; | |
1793 | } | |
1794 | ||
1795 | static void scrub_wr_submit(struct scrub_ctx *sctx) | |
1796 | { | |
1797 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1798 | struct scrub_bio *sbio; | |
1799 | ||
1800 | if (!wr_ctx->wr_curr_bio) | |
1801 | return; | |
1802 | ||
1803 | sbio = wr_ctx->wr_curr_bio; | |
1804 | wr_ctx->wr_curr_bio = NULL; | |
1805 | WARN_ON(!sbio->bio->bi_bdev); | |
1806 | scrub_pending_bio_inc(sctx); | |
1807 | /* process all writes in a single worker thread. Then the block layer | |
1808 | * orders the requests before sending them to the driver which | |
1809 | * doubled the write performance on spinning disks when measured | |
1810 | * with Linux 3.5 */ | |
1811 | btrfsic_submit_bio(WRITE, sbio->bio); | |
1812 | } | |
1813 | ||
1814 | static void scrub_wr_bio_end_io(struct bio *bio, int err) | |
1815 | { | |
1816 | struct scrub_bio *sbio = bio->bi_private; | |
1817 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; | |
1818 | ||
1819 | sbio->err = err; | |
1820 | sbio->bio = bio; | |
1821 | ||
9e0af237 LB |
1822 | btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper, |
1823 | scrub_wr_bio_end_io_worker, NULL, NULL); | |
0339ef2f | 1824 | btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work); |
ff023aac SB |
1825 | } |
1826 | ||
1827 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) | |
1828 | { | |
1829 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
1830 | struct scrub_ctx *sctx = sbio->sctx; | |
1831 | int i; | |
1832 | ||
1833 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); | |
1834 | if (sbio->err) { | |
1835 | struct btrfs_dev_replace *dev_replace = | |
1836 | &sbio->sctx->dev_root->fs_info->dev_replace; | |
1837 | ||
1838 | for (i = 0; i < sbio->page_count; i++) { | |
1839 | struct scrub_page *spage = sbio->pagev[i]; | |
1840 | ||
1841 | spage->io_error = 1; | |
1842 | btrfs_dev_replace_stats_inc(&dev_replace-> | |
1843 | num_write_errors); | |
1844 | } | |
1845 | } | |
1846 | ||
1847 | for (i = 0; i < sbio->page_count; i++) | |
1848 | scrub_page_put(sbio->pagev[i]); | |
1849 | ||
1850 | bio_put(sbio->bio); | |
1851 | kfree(sbio); | |
1852 | scrub_pending_bio_dec(sctx); | |
1853 | } | |
1854 | ||
1855 | static int scrub_checksum(struct scrub_block *sblock) | |
b5d67f64 SB |
1856 | { |
1857 | u64 flags; | |
1858 | int ret; | |
1859 | ||
7a9e9987 SB |
1860 | WARN_ON(sblock->page_count < 1); |
1861 | flags = sblock->pagev[0]->flags; | |
b5d67f64 SB |
1862 | ret = 0; |
1863 | if (flags & BTRFS_EXTENT_FLAG_DATA) | |
1864 | ret = scrub_checksum_data(sblock); | |
1865 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) | |
1866 | ret = scrub_checksum_tree_block(sblock); | |
1867 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
1868 | (void)scrub_checksum_super(sblock); | |
1869 | else | |
1870 | WARN_ON(1); | |
1871 | if (ret) | |
1872 | scrub_handle_errored_block(sblock); | |
ff023aac SB |
1873 | |
1874 | return ret; | |
a2de733c AJ |
1875 | } |
1876 | ||
b5d67f64 | 1877 | static int scrub_checksum_data(struct scrub_block *sblock) |
a2de733c | 1878 | { |
d9d181c1 | 1879 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1880 | u8 csum[BTRFS_CSUM_SIZE]; |
b5d67f64 SB |
1881 | u8 *on_disk_csum; |
1882 | struct page *page; | |
1883 | void *buffer; | |
a2de733c AJ |
1884 | u32 crc = ~(u32)0; |
1885 | int fail = 0; | |
b5d67f64 SB |
1886 | u64 len; |
1887 | int index; | |
a2de733c | 1888 | |
b5d67f64 | 1889 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1890 | if (!sblock->pagev[0]->have_csum) |
a2de733c AJ |
1891 | return 0; |
1892 | ||
7a9e9987 SB |
1893 | on_disk_csum = sblock->pagev[0]->csum; |
1894 | page = sblock->pagev[0]->page; | |
9613bebb | 1895 | buffer = kmap_atomic(page); |
b5d67f64 | 1896 | |
d9d181c1 | 1897 | len = sctx->sectorsize; |
b5d67f64 SB |
1898 | index = 0; |
1899 | for (;;) { | |
1900 | u64 l = min_t(u64, len, PAGE_SIZE); | |
1901 | ||
b0496686 | 1902 | crc = btrfs_csum_data(buffer, crc, l); |
9613bebb | 1903 | kunmap_atomic(buffer); |
b5d67f64 SB |
1904 | len -= l; |
1905 | if (len == 0) | |
1906 | break; | |
1907 | index++; | |
1908 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1909 | BUG_ON(!sblock->pagev[index]->page); |
1910 | page = sblock->pagev[index]->page; | |
9613bebb | 1911 | buffer = kmap_atomic(page); |
b5d67f64 SB |
1912 | } |
1913 | ||
a2de733c | 1914 | btrfs_csum_final(crc, csum); |
d9d181c1 | 1915 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1916 | fail = 1; |
1917 | ||
a2de733c AJ |
1918 | return fail; |
1919 | } | |
1920 | ||
b5d67f64 | 1921 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
a2de733c | 1922 | { |
d9d181c1 | 1923 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1924 | struct btrfs_header *h; |
a36cf8b8 | 1925 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 1926 | struct btrfs_fs_info *fs_info = root->fs_info; |
b5d67f64 SB |
1927 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1928 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1929 | struct page *page; | |
1930 | void *mapped_buffer; | |
1931 | u64 mapped_size; | |
1932 | void *p; | |
a2de733c AJ |
1933 | u32 crc = ~(u32)0; |
1934 | int fail = 0; | |
1935 | int crc_fail = 0; | |
b5d67f64 SB |
1936 | u64 len; |
1937 | int index; | |
1938 | ||
1939 | BUG_ON(sblock->page_count < 1); | |
7a9e9987 | 1940 | page = sblock->pagev[0]->page; |
9613bebb | 1941 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1942 | h = (struct btrfs_header *)mapped_buffer; |
d9d181c1 | 1943 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
a2de733c AJ |
1944 | |
1945 | /* | |
1946 | * we don't use the getter functions here, as we | |
1947 | * a) don't have an extent buffer and | |
1948 | * b) the page is already kmapped | |
1949 | */ | |
a2de733c | 1950 | |
3cae210f | 1951 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h)) |
a2de733c AJ |
1952 | ++fail; |
1953 | ||
3cae210f | 1954 | if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h)) |
a2de733c AJ |
1955 | ++fail; |
1956 | ||
17a9be2f | 1957 | if (!scrub_check_fsid(h->fsid, sblock->pagev[0])) |
a2de733c AJ |
1958 | ++fail; |
1959 | ||
1960 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
1961 | BTRFS_UUID_SIZE)) | |
1962 | ++fail; | |
1963 | ||
d9d181c1 | 1964 | len = sctx->nodesize - BTRFS_CSUM_SIZE; |
b5d67f64 SB |
1965 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
1966 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1967 | index = 0; | |
1968 | for (;;) { | |
1969 | u64 l = min_t(u64, len, mapped_size); | |
1970 | ||
b0496686 | 1971 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 1972 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1973 | len -= l; |
1974 | if (len == 0) | |
1975 | break; | |
1976 | index++; | |
1977 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1978 | BUG_ON(!sblock->pagev[index]->page); |
1979 | page = sblock->pagev[index]->page; | |
9613bebb | 1980 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1981 | mapped_size = PAGE_SIZE; |
1982 | p = mapped_buffer; | |
1983 | } | |
1984 | ||
1985 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1986 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1987 | ++crc_fail; |
1988 | ||
a2de733c AJ |
1989 | return fail || crc_fail; |
1990 | } | |
1991 | ||
b5d67f64 | 1992 | static int scrub_checksum_super(struct scrub_block *sblock) |
a2de733c AJ |
1993 | { |
1994 | struct btrfs_super_block *s; | |
d9d181c1 | 1995 | struct scrub_ctx *sctx = sblock->sctx; |
b5d67f64 SB |
1996 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1997 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1998 | struct page *page; | |
1999 | void *mapped_buffer; | |
2000 | u64 mapped_size; | |
2001 | void *p; | |
a2de733c | 2002 | u32 crc = ~(u32)0; |
442a4f63 SB |
2003 | int fail_gen = 0; |
2004 | int fail_cor = 0; | |
b5d67f64 SB |
2005 | u64 len; |
2006 | int index; | |
a2de733c | 2007 | |
b5d67f64 | 2008 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 2009 | page = sblock->pagev[0]->page; |
9613bebb | 2010 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 2011 | s = (struct btrfs_super_block *)mapped_buffer; |
d9d181c1 | 2012 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
a2de733c | 2013 | |
3cae210f | 2014 | if (sblock->pagev[0]->logical != btrfs_super_bytenr(s)) |
442a4f63 | 2015 | ++fail_cor; |
a2de733c | 2016 | |
3cae210f | 2017 | if (sblock->pagev[0]->generation != btrfs_super_generation(s)) |
442a4f63 | 2018 | ++fail_gen; |
a2de733c | 2019 | |
17a9be2f | 2020 | if (!scrub_check_fsid(s->fsid, sblock->pagev[0])) |
442a4f63 | 2021 | ++fail_cor; |
a2de733c | 2022 | |
b5d67f64 SB |
2023 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
2024 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; | |
2025 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
2026 | index = 0; | |
2027 | for (;;) { | |
2028 | u64 l = min_t(u64, len, mapped_size); | |
2029 | ||
b0496686 | 2030 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 2031 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
2032 | len -= l; |
2033 | if (len == 0) | |
2034 | break; | |
2035 | index++; | |
2036 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
2037 | BUG_ON(!sblock->pagev[index]->page); |
2038 | page = sblock->pagev[index]->page; | |
9613bebb | 2039 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
2040 | mapped_size = PAGE_SIZE; |
2041 | p = mapped_buffer; | |
2042 | } | |
2043 | ||
2044 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 2045 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
442a4f63 | 2046 | ++fail_cor; |
a2de733c | 2047 | |
442a4f63 | 2048 | if (fail_cor + fail_gen) { |
a2de733c AJ |
2049 | /* |
2050 | * if we find an error in a super block, we just report it. | |
2051 | * They will get written with the next transaction commit | |
2052 | * anyway | |
2053 | */ | |
d9d181c1 SB |
2054 | spin_lock(&sctx->stat_lock); |
2055 | ++sctx->stat.super_errors; | |
2056 | spin_unlock(&sctx->stat_lock); | |
442a4f63 | 2057 | if (fail_cor) |
7a9e9987 | 2058 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 SB |
2059 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
2060 | else | |
7a9e9987 | 2061 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 | 2062 | BTRFS_DEV_STAT_GENERATION_ERRS); |
a2de733c AJ |
2063 | } |
2064 | ||
442a4f63 | 2065 | return fail_cor + fail_gen; |
a2de733c AJ |
2066 | } |
2067 | ||
b5d67f64 SB |
2068 | static void scrub_block_get(struct scrub_block *sblock) |
2069 | { | |
2070 | atomic_inc(&sblock->ref_count); | |
2071 | } | |
2072 | ||
2073 | static void scrub_block_put(struct scrub_block *sblock) | |
2074 | { | |
2075 | if (atomic_dec_and_test(&sblock->ref_count)) { | |
2076 | int i; | |
2077 | ||
5a6ac9ea MX |
2078 | if (sblock->sparity) |
2079 | scrub_parity_put(sblock->sparity); | |
2080 | ||
b5d67f64 | 2081 | for (i = 0; i < sblock->page_count; i++) |
7a9e9987 | 2082 | scrub_page_put(sblock->pagev[i]); |
b5d67f64 SB |
2083 | kfree(sblock); |
2084 | } | |
2085 | } | |
2086 | ||
7a9e9987 SB |
2087 | static void scrub_page_get(struct scrub_page *spage) |
2088 | { | |
2089 | atomic_inc(&spage->ref_count); | |
2090 | } | |
2091 | ||
2092 | static void scrub_page_put(struct scrub_page *spage) | |
2093 | { | |
2094 | if (atomic_dec_and_test(&spage->ref_count)) { | |
2095 | if (spage->page) | |
2096 | __free_page(spage->page); | |
2097 | kfree(spage); | |
2098 | } | |
2099 | } | |
2100 | ||
d9d181c1 | 2101 | static void scrub_submit(struct scrub_ctx *sctx) |
a2de733c AJ |
2102 | { |
2103 | struct scrub_bio *sbio; | |
2104 | ||
d9d181c1 | 2105 | if (sctx->curr == -1) |
1623edeb | 2106 | return; |
a2de733c | 2107 | |
d9d181c1 SB |
2108 | sbio = sctx->bios[sctx->curr]; |
2109 | sctx->curr = -1; | |
b6bfebc1 | 2110 | scrub_pending_bio_inc(sctx); |
a2de733c | 2111 | |
ff023aac SB |
2112 | if (!sbio->bio->bi_bdev) { |
2113 | /* | |
2114 | * this case should not happen. If btrfs_map_block() is | |
2115 | * wrong, it could happen for dev-replace operations on | |
2116 | * missing devices when no mirrors are available, but in | |
2117 | * this case it should already fail the mount. | |
2118 | * This case is handled correctly (but _very_ slowly). | |
2119 | */ | |
2120 | printk_ratelimited(KERN_WARNING | |
efe120a0 | 2121 | "BTRFS: scrub_submit(bio bdev == NULL) is unexpected!\n"); |
ff023aac SB |
2122 | bio_endio(sbio->bio, -EIO); |
2123 | } else { | |
2124 | btrfsic_submit_bio(READ, sbio->bio); | |
2125 | } | |
a2de733c AJ |
2126 | } |
2127 | ||
ff023aac SB |
2128 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
2129 | struct scrub_page *spage) | |
a2de733c | 2130 | { |
b5d67f64 | 2131 | struct scrub_block *sblock = spage->sblock; |
a2de733c | 2132 | struct scrub_bio *sbio; |
69f4cb52 | 2133 | int ret; |
a2de733c AJ |
2134 | |
2135 | again: | |
2136 | /* | |
2137 | * grab a fresh bio or wait for one to become available | |
2138 | */ | |
d9d181c1 SB |
2139 | while (sctx->curr == -1) { |
2140 | spin_lock(&sctx->list_lock); | |
2141 | sctx->curr = sctx->first_free; | |
2142 | if (sctx->curr != -1) { | |
2143 | sctx->first_free = sctx->bios[sctx->curr]->next_free; | |
2144 | sctx->bios[sctx->curr]->next_free = -1; | |
2145 | sctx->bios[sctx->curr]->page_count = 0; | |
2146 | spin_unlock(&sctx->list_lock); | |
a2de733c | 2147 | } else { |
d9d181c1 SB |
2148 | spin_unlock(&sctx->list_lock); |
2149 | wait_event(sctx->list_wait, sctx->first_free != -1); | |
a2de733c AJ |
2150 | } |
2151 | } | |
d9d181c1 | 2152 | sbio = sctx->bios[sctx->curr]; |
b5d67f64 | 2153 | if (sbio->page_count == 0) { |
69f4cb52 AJ |
2154 | struct bio *bio; |
2155 | ||
b5d67f64 SB |
2156 | sbio->physical = spage->physical; |
2157 | sbio->logical = spage->logical; | |
a36cf8b8 | 2158 | sbio->dev = spage->dev; |
b5d67f64 SB |
2159 | bio = sbio->bio; |
2160 | if (!bio) { | |
9be3395b | 2161 | bio = btrfs_io_bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio); |
b5d67f64 SB |
2162 | if (!bio) |
2163 | return -ENOMEM; | |
2164 | sbio->bio = bio; | |
2165 | } | |
69f4cb52 AJ |
2166 | |
2167 | bio->bi_private = sbio; | |
2168 | bio->bi_end_io = scrub_bio_end_io; | |
a36cf8b8 | 2169 | bio->bi_bdev = sbio->dev->bdev; |
4f024f37 | 2170 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
69f4cb52 | 2171 | sbio->err = 0; |
b5d67f64 SB |
2172 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
2173 | spage->physical || | |
2174 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
a36cf8b8 SB |
2175 | spage->logical || |
2176 | sbio->dev != spage->dev) { | |
d9d181c1 | 2177 | scrub_submit(sctx); |
a2de733c AJ |
2178 | goto again; |
2179 | } | |
69f4cb52 | 2180 | |
b5d67f64 SB |
2181 | sbio->pagev[sbio->page_count] = spage; |
2182 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
2183 | if (ret != PAGE_SIZE) { | |
2184 | if (sbio->page_count < 1) { | |
2185 | bio_put(sbio->bio); | |
2186 | sbio->bio = NULL; | |
2187 | return -EIO; | |
2188 | } | |
d9d181c1 | 2189 | scrub_submit(sctx); |
69f4cb52 AJ |
2190 | goto again; |
2191 | } | |
2192 | ||
ff023aac | 2193 | scrub_block_get(sblock); /* one for the page added to the bio */ |
b5d67f64 SB |
2194 | atomic_inc(&sblock->outstanding_pages); |
2195 | sbio->page_count++; | |
ff023aac | 2196 | if (sbio->page_count == sctx->pages_per_rd_bio) |
d9d181c1 | 2197 | scrub_submit(sctx); |
b5d67f64 SB |
2198 | |
2199 | return 0; | |
2200 | } | |
2201 | ||
d9d181c1 | 2202 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2203 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
2204 | u64 gen, int mirror_num, u8 *csum, int force, |
2205 | u64 physical_for_dev_replace) | |
b5d67f64 SB |
2206 | { |
2207 | struct scrub_block *sblock; | |
2208 | int index; | |
2209 | ||
2210 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
2211 | if (!sblock) { | |
d9d181c1 SB |
2212 | spin_lock(&sctx->stat_lock); |
2213 | sctx->stat.malloc_errors++; | |
2214 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2215 | return -ENOMEM; |
a2de733c | 2216 | } |
b5d67f64 | 2217 | |
7a9e9987 SB |
2218 | /* one ref inside this function, plus one for each page added to |
2219 | * a bio later on */ | |
b5d67f64 | 2220 | atomic_set(&sblock->ref_count, 1); |
d9d181c1 | 2221 | sblock->sctx = sctx; |
b5d67f64 SB |
2222 | sblock->no_io_error_seen = 1; |
2223 | ||
2224 | for (index = 0; len > 0; index++) { | |
7a9e9987 | 2225 | struct scrub_page *spage; |
b5d67f64 SB |
2226 | u64 l = min_t(u64, len, PAGE_SIZE); |
2227 | ||
7a9e9987 SB |
2228 | spage = kzalloc(sizeof(*spage), GFP_NOFS); |
2229 | if (!spage) { | |
2230 | leave_nomem: | |
d9d181c1 SB |
2231 | spin_lock(&sctx->stat_lock); |
2232 | sctx->stat.malloc_errors++; | |
2233 | spin_unlock(&sctx->stat_lock); | |
7a9e9987 | 2234 | scrub_block_put(sblock); |
b5d67f64 SB |
2235 | return -ENOMEM; |
2236 | } | |
7a9e9987 SB |
2237 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
2238 | scrub_page_get(spage); | |
2239 | sblock->pagev[index] = spage; | |
b5d67f64 | 2240 | spage->sblock = sblock; |
a36cf8b8 | 2241 | spage->dev = dev; |
b5d67f64 SB |
2242 | spage->flags = flags; |
2243 | spage->generation = gen; | |
2244 | spage->logical = logical; | |
2245 | spage->physical = physical; | |
ff023aac | 2246 | spage->physical_for_dev_replace = physical_for_dev_replace; |
b5d67f64 SB |
2247 | spage->mirror_num = mirror_num; |
2248 | if (csum) { | |
2249 | spage->have_csum = 1; | |
d9d181c1 | 2250 | memcpy(spage->csum, csum, sctx->csum_size); |
b5d67f64 SB |
2251 | } else { |
2252 | spage->have_csum = 0; | |
2253 | } | |
2254 | sblock->page_count++; | |
7a9e9987 SB |
2255 | spage->page = alloc_page(GFP_NOFS); |
2256 | if (!spage->page) | |
2257 | goto leave_nomem; | |
b5d67f64 SB |
2258 | len -= l; |
2259 | logical += l; | |
2260 | physical += l; | |
ff023aac | 2261 | physical_for_dev_replace += l; |
b5d67f64 SB |
2262 | } |
2263 | ||
7a9e9987 | 2264 | WARN_ON(sblock->page_count == 0); |
b5d67f64 | 2265 | for (index = 0; index < sblock->page_count; index++) { |
7a9e9987 | 2266 | struct scrub_page *spage = sblock->pagev[index]; |
1bc87793 AJ |
2267 | int ret; |
2268 | ||
ff023aac | 2269 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
b5d67f64 SB |
2270 | if (ret) { |
2271 | scrub_block_put(sblock); | |
1bc87793 | 2272 | return ret; |
b5d67f64 | 2273 | } |
1bc87793 | 2274 | } |
a2de733c | 2275 | |
b5d67f64 | 2276 | if (force) |
d9d181c1 | 2277 | scrub_submit(sctx); |
a2de733c | 2278 | |
b5d67f64 SB |
2279 | /* last one frees, either here or in bio completion for last page */ |
2280 | scrub_block_put(sblock); | |
a2de733c AJ |
2281 | return 0; |
2282 | } | |
2283 | ||
b5d67f64 SB |
2284 | static void scrub_bio_end_io(struct bio *bio, int err) |
2285 | { | |
2286 | struct scrub_bio *sbio = bio->bi_private; | |
a36cf8b8 | 2287 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
b5d67f64 SB |
2288 | |
2289 | sbio->err = err; | |
2290 | sbio->bio = bio; | |
2291 | ||
0339ef2f | 2292 | btrfs_queue_work(fs_info->scrub_workers, &sbio->work); |
b5d67f64 SB |
2293 | } |
2294 | ||
2295 | static void scrub_bio_end_io_worker(struct btrfs_work *work) | |
2296 | { | |
2297 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
d9d181c1 | 2298 | struct scrub_ctx *sctx = sbio->sctx; |
b5d67f64 SB |
2299 | int i; |
2300 | ||
ff023aac | 2301 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
2302 | if (sbio->err) { |
2303 | for (i = 0; i < sbio->page_count; i++) { | |
2304 | struct scrub_page *spage = sbio->pagev[i]; | |
2305 | ||
2306 | spage->io_error = 1; | |
2307 | spage->sblock->no_io_error_seen = 0; | |
2308 | } | |
2309 | } | |
2310 | ||
2311 | /* now complete the scrub_block items that have all pages completed */ | |
2312 | for (i = 0; i < sbio->page_count; i++) { | |
2313 | struct scrub_page *spage = sbio->pagev[i]; | |
2314 | struct scrub_block *sblock = spage->sblock; | |
2315 | ||
2316 | if (atomic_dec_and_test(&sblock->outstanding_pages)) | |
2317 | scrub_block_complete(sblock); | |
2318 | scrub_block_put(sblock); | |
2319 | } | |
2320 | ||
b5d67f64 SB |
2321 | bio_put(sbio->bio); |
2322 | sbio->bio = NULL; | |
d9d181c1 SB |
2323 | spin_lock(&sctx->list_lock); |
2324 | sbio->next_free = sctx->first_free; | |
2325 | sctx->first_free = sbio->index; | |
2326 | spin_unlock(&sctx->list_lock); | |
ff023aac SB |
2327 | |
2328 | if (sctx->is_dev_replace && | |
2329 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { | |
2330 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2331 | scrub_wr_submit(sctx); | |
2332 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2333 | } | |
2334 | ||
b6bfebc1 | 2335 | scrub_pending_bio_dec(sctx); |
b5d67f64 SB |
2336 | } |
2337 | ||
5a6ac9ea MX |
2338 | static inline void __scrub_mark_bitmap(struct scrub_parity *sparity, |
2339 | unsigned long *bitmap, | |
2340 | u64 start, u64 len) | |
2341 | { | |
2342 | int offset; | |
2343 | int nsectors; | |
2344 | int sectorsize = sparity->sctx->dev_root->sectorsize; | |
2345 | ||
2346 | if (len >= sparity->stripe_len) { | |
2347 | bitmap_set(bitmap, 0, sparity->nsectors); | |
2348 | return; | |
2349 | } | |
2350 | ||
2351 | start -= sparity->logic_start; | |
2352 | offset = (int)do_div(start, sparity->stripe_len); | |
2353 | offset /= sectorsize; | |
2354 | nsectors = (int)len / sectorsize; | |
2355 | ||
2356 | if (offset + nsectors <= sparity->nsectors) { | |
2357 | bitmap_set(bitmap, offset, nsectors); | |
2358 | return; | |
2359 | } | |
2360 | ||
2361 | bitmap_set(bitmap, offset, sparity->nsectors - offset); | |
2362 | bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset)); | |
2363 | } | |
2364 | ||
2365 | static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity, | |
2366 | u64 start, u64 len) | |
2367 | { | |
2368 | __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len); | |
2369 | } | |
2370 | ||
2371 | static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity, | |
2372 | u64 start, u64 len) | |
2373 | { | |
2374 | __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len); | |
2375 | } | |
2376 | ||
b5d67f64 SB |
2377 | static void scrub_block_complete(struct scrub_block *sblock) |
2378 | { | |
5a6ac9ea MX |
2379 | int corrupted = 0; |
2380 | ||
ff023aac | 2381 | if (!sblock->no_io_error_seen) { |
5a6ac9ea | 2382 | corrupted = 1; |
b5d67f64 | 2383 | scrub_handle_errored_block(sblock); |
ff023aac SB |
2384 | } else { |
2385 | /* | |
2386 | * if has checksum error, write via repair mechanism in | |
2387 | * dev replace case, otherwise write here in dev replace | |
2388 | * case. | |
2389 | */ | |
5a6ac9ea MX |
2390 | corrupted = scrub_checksum(sblock); |
2391 | if (!corrupted && sblock->sctx->is_dev_replace) | |
ff023aac SB |
2392 | scrub_write_block_to_dev_replace(sblock); |
2393 | } | |
5a6ac9ea MX |
2394 | |
2395 | if (sblock->sparity && corrupted && !sblock->data_corrected) { | |
2396 | u64 start = sblock->pagev[0]->logical; | |
2397 | u64 end = sblock->pagev[sblock->page_count - 1]->logical + | |
2398 | PAGE_SIZE; | |
2399 | ||
2400 | scrub_parity_mark_sectors_error(sblock->sparity, | |
2401 | start, end - start); | |
2402 | } | |
b5d67f64 SB |
2403 | } |
2404 | ||
d9d181c1 | 2405 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len, |
a2de733c AJ |
2406 | u8 *csum) |
2407 | { | |
2408 | struct btrfs_ordered_sum *sum = NULL; | |
f51a4a18 | 2409 | unsigned long index; |
a2de733c | 2410 | unsigned long num_sectors; |
a2de733c | 2411 | |
d9d181c1 SB |
2412 | while (!list_empty(&sctx->csum_list)) { |
2413 | sum = list_first_entry(&sctx->csum_list, | |
a2de733c AJ |
2414 | struct btrfs_ordered_sum, list); |
2415 | if (sum->bytenr > logical) | |
2416 | return 0; | |
2417 | if (sum->bytenr + sum->len > logical) | |
2418 | break; | |
2419 | ||
d9d181c1 | 2420 | ++sctx->stat.csum_discards; |
a2de733c AJ |
2421 | list_del(&sum->list); |
2422 | kfree(sum); | |
2423 | sum = NULL; | |
2424 | } | |
2425 | if (!sum) | |
2426 | return 0; | |
2427 | ||
f51a4a18 | 2428 | index = ((u32)(logical - sum->bytenr)) / sctx->sectorsize; |
d9d181c1 | 2429 | num_sectors = sum->len / sctx->sectorsize; |
f51a4a18 MX |
2430 | memcpy(csum, sum->sums + index, sctx->csum_size); |
2431 | if (index == num_sectors - 1) { | |
a2de733c AJ |
2432 | list_del(&sum->list); |
2433 | kfree(sum); | |
2434 | } | |
f51a4a18 | 2435 | return 1; |
a2de733c AJ |
2436 | } |
2437 | ||
2438 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
d9d181c1 | 2439 | static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2440 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac | 2441 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
a2de733c AJ |
2442 | { |
2443 | int ret; | |
2444 | u8 csum[BTRFS_CSUM_SIZE]; | |
b5d67f64 SB |
2445 | u32 blocksize; |
2446 | ||
2447 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
d9d181c1 SB |
2448 | blocksize = sctx->sectorsize; |
2449 | spin_lock(&sctx->stat_lock); | |
2450 | sctx->stat.data_extents_scrubbed++; | |
2451 | sctx->stat.data_bytes_scrubbed += len; | |
2452 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2453 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
d9d181c1 SB |
2454 | blocksize = sctx->nodesize; |
2455 | spin_lock(&sctx->stat_lock); | |
2456 | sctx->stat.tree_extents_scrubbed++; | |
2457 | sctx->stat.tree_bytes_scrubbed += len; | |
2458 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2459 | } else { |
d9d181c1 | 2460 | blocksize = sctx->sectorsize; |
ff023aac | 2461 | WARN_ON(1); |
b5d67f64 | 2462 | } |
a2de733c AJ |
2463 | |
2464 | while (len) { | |
b5d67f64 | 2465 | u64 l = min_t(u64, len, blocksize); |
a2de733c AJ |
2466 | int have_csum = 0; |
2467 | ||
2468 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2469 | /* push csums to sbio */ | |
d9d181c1 | 2470 | have_csum = scrub_find_csum(sctx, logical, l, csum); |
a2de733c | 2471 | if (have_csum == 0) |
d9d181c1 | 2472 | ++sctx->stat.no_csum; |
ff023aac SB |
2473 | if (sctx->is_dev_replace && !have_csum) { |
2474 | ret = copy_nocow_pages(sctx, logical, l, | |
2475 | mirror_num, | |
2476 | physical_for_dev_replace); | |
2477 | goto behind_scrub_pages; | |
2478 | } | |
a2de733c | 2479 | } |
a36cf8b8 | 2480 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
ff023aac SB |
2481 | mirror_num, have_csum ? csum : NULL, 0, |
2482 | physical_for_dev_replace); | |
2483 | behind_scrub_pages: | |
a2de733c AJ |
2484 | if (ret) |
2485 | return ret; | |
2486 | len -= l; | |
2487 | logical += l; | |
2488 | physical += l; | |
ff023aac | 2489 | physical_for_dev_replace += l; |
a2de733c AJ |
2490 | } |
2491 | return 0; | |
2492 | } | |
2493 | ||
5a6ac9ea MX |
2494 | static int scrub_pages_for_parity(struct scrub_parity *sparity, |
2495 | u64 logical, u64 len, | |
2496 | u64 physical, struct btrfs_device *dev, | |
2497 | u64 flags, u64 gen, int mirror_num, u8 *csum) | |
2498 | { | |
2499 | struct scrub_ctx *sctx = sparity->sctx; | |
2500 | struct scrub_block *sblock; | |
2501 | int index; | |
2502 | ||
2503 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
2504 | if (!sblock) { | |
2505 | spin_lock(&sctx->stat_lock); | |
2506 | sctx->stat.malloc_errors++; | |
2507 | spin_unlock(&sctx->stat_lock); | |
2508 | return -ENOMEM; | |
2509 | } | |
2510 | ||
2511 | /* one ref inside this function, plus one for each page added to | |
2512 | * a bio later on */ | |
2513 | atomic_set(&sblock->ref_count, 1); | |
2514 | sblock->sctx = sctx; | |
2515 | sblock->no_io_error_seen = 1; | |
2516 | sblock->sparity = sparity; | |
2517 | scrub_parity_get(sparity); | |
2518 | ||
2519 | for (index = 0; len > 0; index++) { | |
2520 | struct scrub_page *spage; | |
2521 | u64 l = min_t(u64, len, PAGE_SIZE); | |
2522 | ||
2523 | spage = kzalloc(sizeof(*spage), GFP_NOFS); | |
2524 | if (!spage) { | |
2525 | leave_nomem: | |
2526 | spin_lock(&sctx->stat_lock); | |
2527 | sctx->stat.malloc_errors++; | |
2528 | spin_unlock(&sctx->stat_lock); | |
2529 | scrub_block_put(sblock); | |
2530 | return -ENOMEM; | |
2531 | } | |
2532 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); | |
2533 | /* For scrub block */ | |
2534 | scrub_page_get(spage); | |
2535 | sblock->pagev[index] = spage; | |
2536 | /* For scrub parity */ | |
2537 | scrub_page_get(spage); | |
2538 | list_add_tail(&spage->list, &sparity->spages); | |
2539 | spage->sblock = sblock; | |
2540 | spage->dev = dev; | |
2541 | spage->flags = flags; | |
2542 | spage->generation = gen; | |
2543 | spage->logical = logical; | |
2544 | spage->physical = physical; | |
2545 | spage->mirror_num = mirror_num; | |
2546 | if (csum) { | |
2547 | spage->have_csum = 1; | |
2548 | memcpy(spage->csum, csum, sctx->csum_size); | |
2549 | } else { | |
2550 | spage->have_csum = 0; | |
2551 | } | |
2552 | sblock->page_count++; | |
2553 | spage->page = alloc_page(GFP_NOFS); | |
2554 | if (!spage->page) | |
2555 | goto leave_nomem; | |
2556 | len -= l; | |
2557 | logical += l; | |
2558 | physical += l; | |
2559 | } | |
2560 | ||
2561 | WARN_ON(sblock->page_count == 0); | |
2562 | for (index = 0; index < sblock->page_count; index++) { | |
2563 | struct scrub_page *spage = sblock->pagev[index]; | |
2564 | int ret; | |
2565 | ||
2566 | ret = scrub_add_page_to_rd_bio(sctx, spage); | |
2567 | if (ret) { | |
2568 | scrub_block_put(sblock); | |
2569 | return ret; | |
2570 | } | |
2571 | } | |
2572 | ||
2573 | /* last one frees, either here or in bio completion for last page */ | |
2574 | scrub_block_put(sblock); | |
2575 | return 0; | |
2576 | } | |
2577 | ||
2578 | static int scrub_extent_for_parity(struct scrub_parity *sparity, | |
2579 | u64 logical, u64 len, | |
2580 | u64 physical, struct btrfs_device *dev, | |
2581 | u64 flags, u64 gen, int mirror_num) | |
2582 | { | |
2583 | struct scrub_ctx *sctx = sparity->sctx; | |
2584 | int ret; | |
2585 | u8 csum[BTRFS_CSUM_SIZE]; | |
2586 | u32 blocksize; | |
2587 | ||
2588 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2589 | blocksize = sctx->sectorsize; | |
2590 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
2591 | blocksize = sctx->nodesize; | |
2592 | } else { | |
2593 | blocksize = sctx->sectorsize; | |
2594 | WARN_ON(1); | |
2595 | } | |
2596 | ||
2597 | while (len) { | |
2598 | u64 l = min_t(u64, len, blocksize); | |
2599 | int have_csum = 0; | |
2600 | ||
2601 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2602 | /* push csums to sbio */ | |
2603 | have_csum = scrub_find_csum(sctx, logical, l, csum); | |
2604 | if (have_csum == 0) | |
2605 | goto skip; | |
2606 | } | |
2607 | ret = scrub_pages_for_parity(sparity, logical, l, physical, dev, | |
2608 | flags, gen, mirror_num, | |
2609 | have_csum ? csum : NULL); | |
2610 | skip: | |
2611 | if (ret) | |
2612 | return ret; | |
2613 | len -= l; | |
2614 | logical += l; | |
2615 | physical += l; | |
2616 | } | |
2617 | return 0; | |
2618 | } | |
2619 | ||
3b080b25 WS |
2620 | /* |
2621 | * Given a physical address, this will calculate it's | |
2622 | * logical offset. if this is a parity stripe, it will return | |
2623 | * the most left data stripe's logical offset. | |
2624 | * | |
2625 | * return 0 if it is a data stripe, 1 means parity stripe. | |
2626 | */ | |
2627 | static int get_raid56_logic_offset(u64 physical, int num, | |
5a6ac9ea MX |
2628 | struct map_lookup *map, u64 *offset, |
2629 | u64 *stripe_start) | |
3b080b25 WS |
2630 | { |
2631 | int i; | |
2632 | int j = 0; | |
2633 | u64 stripe_nr; | |
2634 | u64 last_offset; | |
2635 | int stripe_index; | |
2636 | int rot; | |
2637 | ||
2638 | last_offset = (physical - map->stripes[num].physical) * | |
2639 | nr_data_stripes(map); | |
5a6ac9ea MX |
2640 | if (stripe_start) |
2641 | *stripe_start = last_offset; | |
2642 | ||
3b080b25 WS |
2643 | *offset = last_offset; |
2644 | for (i = 0; i < nr_data_stripes(map); i++) { | |
2645 | *offset = last_offset + i * map->stripe_len; | |
2646 | ||
2647 | stripe_nr = *offset; | |
2648 | do_div(stripe_nr, map->stripe_len); | |
2649 | do_div(stripe_nr, nr_data_stripes(map)); | |
2650 | ||
2651 | /* Work out the disk rotation on this stripe-set */ | |
2652 | rot = do_div(stripe_nr, map->num_stripes); | |
2653 | /* calculate which stripe this data locates */ | |
2654 | rot += i; | |
e4fbaee2 | 2655 | stripe_index = rot % map->num_stripes; |
3b080b25 WS |
2656 | if (stripe_index == num) |
2657 | return 0; | |
2658 | if (stripe_index < num) | |
2659 | j++; | |
2660 | } | |
2661 | *offset = last_offset + j * map->stripe_len; | |
2662 | return 1; | |
2663 | } | |
2664 | ||
5a6ac9ea MX |
2665 | static void scrub_free_parity(struct scrub_parity *sparity) |
2666 | { | |
2667 | struct scrub_ctx *sctx = sparity->sctx; | |
2668 | struct scrub_page *curr, *next; | |
2669 | int nbits; | |
2670 | ||
2671 | nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors); | |
2672 | if (nbits) { | |
2673 | spin_lock(&sctx->stat_lock); | |
2674 | sctx->stat.read_errors += nbits; | |
2675 | sctx->stat.uncorrectable_errors += nbits; | |
2676 | spin_unlock(&sctx->stat_lock); | |
2677 | } | |
2678 | ||
2679 | list_for_each_entry_safe(curr, next, &sparity->spages, list) { | |
2680 | list_del_init(&curr->list); | |
2681 | scrub_page_put(curr); | |
2682 | } | |
2683 | ||
2684 | kfree(sparity); | |
2685 | } | |
2686 | ||
2687 | static void scrub_parity_bio_endio(struct bio *bio, int error) | |
2688 | { | |
2689 | struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private; | |
2690 | struct scrub_ctx *sctx = sparity->sctx; | |
2691 | ||
2692 | if (error) | |
2693 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, | |
2694 | sparity->nsectors); | |
2695 | ||
2696 | scrub_free_parity(sparity); | |
2697 | scrub_pending_bio_dec(sctx); | |
2698 | bio_put(bio); | |
2699 | } | |
2700 | ||
2701 | static void scrub_parity_check_and_repair(struct scrub_parity *sparity) | |
2702 | { | |
2703 | struct scrub_ctx *sctx = sparity->sctx; | |
2704 | struct bio *bio; | |
2705 | struct btrfs_raid_bio *rbio; | |
2706 | struct scrub_page *spage; | |
2707 | struct btrfs_bio *bbio = NULL; | |
2708 | u64 *raid_map = NULL; | |
2709 | u64 length; | |
2710 | int ret; | |
2711 | ||
2712 | if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap, | |
2713 | sparity->nsectors)) | |
2714 | goto out; | |
2715 | ||
2716 | length = sparity->logic_end - sparity->logic_start + 1; | |
2717 | ret = btrfs_map_sblock(sctx->dev_root->fs_info, REQ_GET_READ_MIRRORS, | |
2718 | sparity->logic_start, | |
2719 | &length, &bbio, 0, &raid_map); | |
2720 | if (ret || !bbio || !raid_map) | |
2721 | goto bbio_out; | |
2722 | ||
2723 | bio = btrfs_io_bio_alloc(GFP_NOFS, 0); | |
2724 | if (!bio) | |
2725 | goto bbio_out; | |
2726 | ||
2727 | bio->bi_iter.bi_sector = sparity->logic_start >> 9; | |
2728 | bio->bi_private = sparity; | |
2729 | bio->bi_end_io = scrub_parity_bio_endio; | |
2730 | ||
2731 | rbio = raid56_parity_alloc_scrub_rbio(sctx->dev_root, bio, bbio, | |
2732 | raid_map, length, | |
2733 | sparity->scrub_dev, | |
2734 | sparity->dbitmap, | |
2735 | sparity->nsectors); | |
2736 | if (!rbio) | |
2737 | goto rbio_out; | |
2738 | ||
2739 | list_for_each_entry(spage, &sparity->spages, list) | |
2740 | raid56_parity_add_scrub_pages(rbio, spage->page, | |
2741 | spage->logical); | |
2742 | ||
2743 | scrub_pending_bio_inc(sctx); | |
2744 | raid56_parity_submit_scrub_rbio(rbio); | |
2745 | return; | |
2746 | ||
2747 | rbio_out: | |
2748 | bio_put(bio); | |
2749 | bbio_out: | |
2750 | kfree(bbio); | |
2751 | kfree(raid_map); | |
2752 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, | |
2753 | sparity->nsectors); | |
2754 | spin_lock(&sctx->stat_lock); | |
2755 | sctx->stat.malloc_errors++; | |
2756 | spin_unlock(&sctx->stat_lock); | |
2757 | out: | |
2758 | scrub_free_parity(sparity); | |
2759 | } | |
2760 | ||
2761 | static inline int scrub_calc_parity_bitmap_len(int nsectors) | |
2762 | { | |
2763 | return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * (BITS_PER_LONG / 8); | |
2764 | } | |
2765 | ||
2766 | static void scrub_parity_get(struct scrub_parity *sparity) | |
2767 | { | |
2768 | atomic_inc(&sparity->ref_count); | |
2769 | } | |
2770 | ||
2771 | static void scrub_parity_put(struct scrub_parity *sparity) | |
2772 | { | |
2773 | if (!atomic_dec_and_test(&sparity->ref_count)) | |
2774 | return; | |
2775 | ||
2776 | scrub_parity_check_and_repair(sparity); | |
2777 | } | |
2778 | ||
2779 | static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, | |
2780 | struct map_lookup *map, | |
2781 | struct btrfs_device *sdev, | |
2782 | struct btrfs_path *path, | |
2783 | u64 logic_start, | |
2784 | u64 logic_end) | |
2785 | { | |
2786 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
2787 | struct btrfs_root *root = fs_info->extent_root; | |
2788 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2789 | struct btrfs_extent_item *extent; | |
2790 | u64 flags; | |
2791 | int ret; | |
2792 | int slot; | |
2793 | struct extent_buffer *l; | |
2794 | struct btrfs_key key; | |
2795 | u64 generation; | |
2796 | u64 extent_logical; | |
2797 | u64 extent_physical; | |
2798 | u64 extent_len; | |
2799 | struct btrfs_device *extent_dev; | |
2800 | struct scrub_parity *sparity; | |
2801 | int nsectors; | |
2802 | int bitmap_len; | |
2803 | int extent_mirror_num; | |
2804 | int stop_loop = 0; | |
2805 | ||
2806 | nsectors = map->stripe_len / root->sectorsize; | |
2807 | bitmap_len = scrub_calc_parity_bitmap_len(nsectors); | |
2808 | sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len, | |
2809 | GFP_NOFS); | |
2810 | if (!sparity) { | |
2811 | spin_lock(&sctx->stat_lock); | |
2812 | sctx->stat.malloc_errors++; | |
2813 | spin_unlock(&sctx->stat_lock); | |
2814 | return -ENOMEM; | |
2815 | } | |
2816 | ||
2817 | sparity->stripe_len = map->stripe_len; | |
2818 | sparity->nsectors = nsectors; | |
2819 | sparity->sctx = sctx; | |
2820 | sparity->scrub_dev = sdev; | |
2821 | sparity->logic_start = logic_start; | |
2822 | sparity->logic_end = logic_end; | |
2823 | atomic_set(&sparity->ref_count, 1); | |
2824 | INIT_LIST_HEAD(&sparity->spages); | |
2825 | sparity->dbitmap = sparity->bitmap; | |
2826 | sparity->ebitmap = (void *)sparity->bitmap + bitmap_len; | |
2827 | ||
2828 | ret = 0; | |
2829 | while (logic_start < logic_end) { | |
2830 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) | |
2831 | key.type = BTRFS_METADATA_ITEM_KEY; | |
2832 | else | |
2833 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2834 | key.objectid = logic_start; | |
2835 | key.offset = (u64)-1; | |
2836 | ||
2837 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2838 | if (ret < 0) | |
2839 | goto out; | |
2840 | ||
2841 | if (ret > 0) { | |
2842 | ret = btrfs_previous_extent_item(root, path, 0); | |
2843 | if (ret < 0) | |
2844 | goto out; | |
2845 | if (ret > 0) { | |
2846 | btrfs_release_path(path); | |
2847 | ret = btrfs_search_slot(NULL, root, &key, | |
2848 | path, 0, 0); | |
2849 | if (ret < 0) | |
2850 | goto out; | |
2851 | } | |
2852 | } | |
2853 | ||
2854 | stop_loop = 0; | |
2855 | while (1) { | |
2856 | u64 bytes; | |
2857 | ||
2858 | l = path->nodes[0]; | |
2859 | slot = path->slots[0]; | |
2860 | if (slot >= btrfs_header_nritems(l)) { | |
2861 | ret = btrfs_next_leaf(root, path); | |
2862 | if (ret == 0) | |
2863 | continue; | |
2864 | if (ret < 0) | |
2865 | goto out; | |
2866 | ||
2867 | stop_loop = 1; | |
2868 | break; | |
2869 | } | |
2870 | btrfs_item_key_to_cpu(l, &key, slot); | |
2871 | ||
2872 | if (key.type == BTRFS_METADATA_ITEM_KEY) | |
2873 | bytes = root->nodesize; | |
2874 | else | |
2875 | bytes = key.offset; | |
2876 | ||
2877 | if (key.objectid + bytes <= logic_start) | |
2878 | goto next; | |
2879 | ||
2880 | if (key.type != BTRFS_EXTENT_ITEM_KEY && | |
2881 | key.type != BTRFS_METADATA_ITEM_KEY) | |
2882 | goto next; | |
2883 | ||
2884 | if (key.objectid > logic_end) { | |
2885 | stop_loop = 1; | |
2886 | break; | |
2887 | } | |
2888 | ||
2889 | while (key.objectid >= logic_start + map->stripe_len) | |
2890 | logic_start += map->stripe_len; | |
2891 | ||
2892 | extent = btrfs_item_ptr(l, slot, | |
2893 | struct btrfs_extent_item); | |
2894 | flags = btrfs_extent_flags(l, extent); | |
2895 | generation = btrfs_extent_generation(l, extent); | |
2896 | ||
2897 | if (key.objectid < logic_start && | |
2898 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { | |
2899 | btrfs_err(fs_info, | |
2900 | "scrub: tree block %llu spanning stripes, ignored. logical=%llu", | |
2901 | key.objectid, logic_start); | |
2902 | goto next; | |
2903 | } | |
2904 | again: | |
2905 | extent_logical = key.objectid; | |
2906 | extent_len = bytes; | |
2907 | ||
2908 | if (extent_logical < logic_start) { | |
2909 | extent_len -= logic_start - extent_logical; | |
2910 | extent_logical = logic_start; | |
2911 | } | |
2912 | ||
2913 | if (extent_logical + extent_len > | |
2914 | logic_start + map->stripe_len) | |
2915 | extent_len = logic_start + map->stripe_len - | |
2916 | extent_logical; | |
2917 | ||
2918 | scrub_parity_mark_sectors_data(sparity, extent_logical, | |
2919 | extent_len); | |
2920 | ||
2921 | scrub_remap_extent(fs_info, extent_logical, | |
2922 | extent_len, &extent_physical, | |
2923 | &extent_dev, | |
2924 | &extent_mirror_num); | |
2925 | ||
2926 | ret = btrfs_lookup_csums_range(csum_root, | |
2927 | extent_logical, | |
2928 | extent_logical + extent_len - 1, | |
2929 | &sctx->csum_list, 1); | |
2930 | if (ret) | |
2931 | goto out; | |
2932 | ||
2933 | ret = scrub_extent_for_parity(sparity, extent_logical, | |
2934 | extent_len, | |
2935 | extent_physical, | |
2936 | extent_dev, flags, | |
2937 | generation, | |
2938 | extent_mirror_num); | |
2939 | if (ret) | |
2940 | goto out; | |
2941 | ||
2942 | scrub_free_csums(sctx); | |
2943 | if (extent_logical + extent_len < | |
2944 | key.objectid + bytes) { | |
2945 | logic_start += map->stripe_len; | |
2946 | ||
2947 | if (logic_start >= logic_end) { | |
2948 | stop_loop = 1; | |
2949 | break; | |
2950 | } | |
2951 | ||
2952 | if (logic_start < key.objectid + bytes) { | |
2953 | cond_resched(); | |
2954 | goto again; | |
2955 | } | |
2956 | } | |
2957 | next: | |
2958 | path->slots[0]++; | |
2959 | } | |
2960 | ||
2961 | btrfs_release_path(path); | |
2962 | ||
2963 | if (stop_loop) | |
2964 | break; | |
2965 | ||
2966 | logic_start += map->stripe_len; | |
2967 | } | |
2968 | out: | |
2969 | if (ret < 0) | |
2970 | scrub_parity_mark_sectors_error(sparity, logic_start, | |
2971 | logic_end - logic_start + 1); | |
2972 | scrub_parity_put(sparity); | |
2973 | scrub_submit(sctx); | |
2974 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2975 | scrub_wr_submit(sctx); | |
2976 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2977 | ||
2978 | btrfs_release_path(path); | |
2979 | return ret < 0 ? ret : 0; | |
2980 | } | |
2981 | ||
d9d181c1 | 2982 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
a36cf8b8 SB |
2983 | struct map_lookup *map, |
2984 | struct btrfs_device *scrub_dev, | |
ff023aac SB |
2985 | int num, u64 base, u64 length, |
2986 | int is_dev_replace) | |
a2de733c | 2987 | { |
5a6ac9ea | 2988 | struct btrfs_path *path, *ppath; |
a36cf8b8 | 2989 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
a2de733c AJ |
2990 | struct btrfs_root *root = fs_info->extent_root; |
2991 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2992 | struct btrfs_extent_item *extent; | |
e7786c3a | 2993 | struct blk_plug plug; |
a2de733c AJ |
2994 | u64 flags; |
2995 | int ret; | |
2996 | int slot; | |
a2de733c | 2997 | u64 nstripes; |
a2de733c AJ |
2998 | struct extent_buffer *l; |
2999 | struct btrfs_key key; | |
3000 | u64 physical; | |
3001 | u64 logical; | |
625f1c8d | 3002 | u64 logic_end; |
3b080b25 | 3003 | u64 physical_end; |
a2de733c | 3004 | u64 generation; |
e12fa9cd | 3005 | int mirror_num; |
7a26285e AJ |
3006 | struct reada_control *reada1; |
3007 | struct reada_control *reada2; | |
3008 | struct btrfs_key key_start; | |
3009 | struct btrfs_key key_end; | |
a2de733c AJ |
3010 | u64 increment = map->stripe_len; |
3011 | u64 offset; | |
ff023aac SB |
3012 | u64 extent_logical; |
3013 | u64 extent_physical; | |
3014 | u64 extent_len; | |
5a6ac9ea MX |
3015 | u64 stripe_logical; |
3016 | u64 stripe_end; | |
ff023aac SB |
3017 | struct btrfs_device *extent_dev; |
3018 | int extent_mirror_num; | |
3b080b25 | 3019 | int stop_loop = 0; |
53b381b3 | 3020 | |
a2de733c | 3021 | nstripes = length; |
3b080b25 | 3022 | physical = map->stripes[num].physical; |
a2de733c AJ |
3023 | offset = 0; |
3024 | do_div(nstripes, map->stripe_len); | |
3025 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3026 | offset = map->stripe_len * num; | |
3027 | increment = map->stripe_len * map->num_stripes; | |
193ea74b | 3028 | mirror_num = 1; |
a2de733c AJ |
3029 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
3030 | int factor = map->num_stripes / map->sub_stripes; | |
3031 | offset = map->stripe_len * (num / map->sub_stripes); | |
3032 | increment = map->stripe_len * factor; | |
193ea74b | 3033 | mirror_num = num % map->sub_stripes + 1; |
a2de733c AJ |
3034 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
3035 | increment = map->stripe_len; | |
193ea74b | 3036 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
3037 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
3038 | increment = map->stripe_len; | |
193ea74b | 3039 | mirror_num = num % map->num_stripes + 1; |
3b080b25 WS |
3040 | } else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | |
3041 | BTRFS_BLOCK_GROUP_RAID6)) { | |
5a6ac9ea | 3042 | get_raid56_logic_offset(physical, num, map, &offset, NULL); |
3b080b25 WS |
3043 | increment = map->stripe_len * nr_data_stripes(map); |
3044 | mirror_num = 1; | |
a2de733c AJ |
3045 | } else { |
3046 | increment = map->stripe_len; | |
193ea74b | 3047 | mirror_num = 1; |
a2de733c AJ |
3048 | } |
3049 | ||
3050 | path = btrfs_alloc_path(); | |
3051 | if (!path) | |
3052 | return -ENOMEM; | |
3053 | ||
5a6ac9ea MX |
3054 | ppath = btrfs_alloc_path(); |
3055 | if (!ppath) { | |
3056 | btrfs_free_path(ppath); | |
3057 | return -ENOMEM; | |
3058 | } | |
3059 | ||
b5d67f64 SB |
3060 | /* |
3061 | * work on commit root. The related disk blocks are static as | |
3062 | * long as COW is applied. This means, it is save to rewrite | |
3063 | * them to repair disk errors without any race conditions | |
3064 | */ | |
a2de733c AJ |
3065 | path->search_commit_root = 1; |
3066 | path->skip_locking = 1; | |
3067 | ||
3068 | /* | |
7a26285e AJ |
3069 | * trigger the readahead for extent tree csum tree and wait for |
3070 | * completion. During readahead, the scrub is officially paused | |
3071 | * to not hold off transaction commits | |
a2de733c AJ |
3072 | */ |
3073 | logical = base + offset; | |
3b080b25 WS |
3074 | physical_end = physical + nstripes * map->stripe_len; |
3075 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | | |
3076 | BTRFS_BLOCK_GROUP_RAID6)) { | |
3077 | get_raid56_logic_offset(physical_end, num, | |
5a6ac9ea | 3078 | map, &logic_end, NULL); |
3b080b25 WS |
3079 | logic_end += base; |
3080 | } else { | |
3081 | logic_end = logical + increment * nstripes; | |
3082 | } | |
d9d181c1 | 3083 | wait_event(sctx->list_wait, |
b6bfebc1 | 3084 | atomic_read(&sctx->bios_in_flight) == 0); |
cb7ab021 | 3085 | scrub_blocked_if_needed(fs_info); |
7a26285e AJ |
3086 | |
3087 | /* FIXME it might be better to start readahead at commit root */ | |
3088 | key_start.objectid = logical; | |
3089 | key_start.type = BTRFS_EXTENT_ITEM_KEY; | |
3090 | key_start.offset = (u64)0; | |
3b080b25 | 3091 | key_end.objectid = logic_end; |
3173a18f JB |
3092 | key_end.type = BTRFS_METADATA_ITEM_KEY; |
3093 | key_end.offset = (u64)-1; | |
7a26285e AJ |
3094 | reada1 = btrfs_reada_add(root, &key_start, &key_end); |
3095 | ||
3096 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
3097 | key_start.type = BTRFS_EXTENT_CSUM_KEY; | |
3098 | key_start.offset = logical; | |
3099 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
3100 | key_end.type = BTRFS_EXTENT_CSUM_KEY; | |
3b080b25 | 3101 | key_end.offset = logic_end; |
7a26285e AJ |
3102 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); |
3103 | ||
3104 | if (!IS_ERR(reada1)) | |
3105 | btrfs_reada_wait(reada1); | |
3106 | if (!IS_ERR(reada2)) | |
3107 | btrfs_reada_wait(reada2); | |
3108 | ||
a2de733c AJ |
3109 | |
3110 | /* | |
3111 | * collect all data csums for the stripe to avoid seeking during | |
3112 | * the scrub. This might currently (crc32) end up to be about 1MB | |
3113 | */ | |
e7786c3a | 3114 | blk_start_plug(&plug); |
a2de733c | 3115 | |
a2de733c AJ |
3116 | /* |
3117 | * now find all extents for each stripe and scrub them | |
3118 | */ | |
a2de733c | 3119 | ret = 0; |
3b080b25 WS |
3120 | while (physical < physical_end) { |
3121 | /* for raid56, we skip parity stripe */ | |
3122 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | | |
3123 | BTRFS_BLOCK_GROUP_RAID6)) { | |
3124 | ret = get_raid56_logic_offset(physical, num, | |
5a6ac9ea | 3125 | map, &logical, &stripe_logical); |
3b080b25 | 3126 | logical += base; |
5a6ac9ea MX |
3127 | if (ret) { |
3128 | stripe_logical += base; | |
3129 | stripe_end = stripe_logical + increment - 1; | |
3130 | ret = scrub_raid56_parity(sctx, map, scrub_dev, | |
3131 | ppath, stripe_logical, | |
3132 | stripe_end); | |
3133 | if (ret) | |
3134 | goto out; | |
3b080b25 | 3135 | goto skip; |
5a6ac9ea | 3136 | } |
3b080b25 | 3137 | } |
a2de733c AJ |
3138 | /* |
3139 | * canceled? | |
3140 | */ | |
3141 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
d9d181c1 | 3142 | atomic_read(&sctx->cancel_req)) { |
a2de733c AJ |
3143 | ret = -ECANCELED; |
3144 | goto out; | |
3145 | } | |
3146 | /* | |
3147 | * check to see if we have to pause | |
3148 | */ | |
3149 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
3150 | /* push queued extents */ | |
ff023aac | 3151 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
d9d181c1 | 3152 | scrub_submit(sctx); |
ff023aac SB |
3153 | mutex_lock(&sctx->wr_ctx.wr_lock); |
3154 | scrub_wr_submit(sctx); | |
3155 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
d9d181c1 | 3156 | wait_event(sctx->list_wait, |
b6bfebc1 | 3157 | atomic_read(&sctx->bios_in_flight) == 0); |
ff023aac | 3158 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
3cb0929a | 3159 | scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3160 | } |
3161 | ||
7c76edb7 WS |
3162 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
3163 | key.type = BTRFS_METADATA_ITEM_KEY; | |
3164 | else | |
3165 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
a2de733c | 3166 | key.objectid = logical; |
625f1c8d | 3167 | key.offset = (u64)-1; |
a2de733c AJ |
3168 | |
3169 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3170 | if (ret < 0) | |
3171 | goto out; | |
3173a18f | 3172 | |
8c51032f | 3173 | if (ret > 0) { |
ade2e0b3 | 3174 | ret = btrfs_previous_extent_item(root, path, 0); |
a2de733c AJ |
3175 | if (ret < 0) |
3176 | goto out; | |
8c51032f AJ |
3177 | if (ret > 0) { |
3178 | /* there's no smaller item, so stick with the | |
3179 | * larger one */ | |
3180 | btrfs_release_path(path); | |
3181 | ret = btrfs_search_slot(NULL, root, &key, | |
3182 | path, 0, 0); | |
3183 | if (ret < 0) | |
3184 | goto out; | |
3185 | } | |
a2de733c AJ |
3186 | } |
3187 | ||
625f1c8d | 3188 | stop_loop = 0; |
a2de733c | 3189 | while (1) { |
3173a18f JB |
3190 | u64 bytes; |
3191 | ||
a2de733c AJ |
3192 | l = path->nodes[0]; |
3193 | slot = path->slots[0]; | |
3194 | if (slot >= btrfs_header_nritems(l)) { | |
3195 | ret = btrfs_next_leaf(root, path); | |
3196 | if (ret == 0) | |
3197 | continue; | |
3198 | if (ret < 0) | |
3199 | goto out; | |
3200 | ||
625f1c8d | 3201 | stop_loop = 1; |
a2de733c AJ |
3202 | break; |
3203 | } | |
3204 | btrfs_item_key_to_cpu(l, &key, slot); | |
3205 | ||
3173a18f | 3206 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
707e8a07 | 3207 | bytes = root->nodesize; |
3173a18f JB |
3208 | else |
3209 | bytes = key.offset; | |
3210 | ||
3211 | if (key.objectid + bytes <= logical) | |
a2de733c AJ |
3212 | goto next; |
3213 | ||
625f1c8d LB |
3214 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
3215 | key.type != BTRFS_METADATA_ITEM_KEY) | |
3216 | goto next; | |
a2de733c | 3217 | |
625f1c8d LB |
3218 | if (key.objectid >= logical + map->stripe_len) { |
3219 | /* out of this device extent */ | |
3220 | if (key.objectid >= logic_end) | |
3221 | stop_loop = 1; | |
3222 | break; | |
3223 | } | |
a2de733c AJ |
3224 | |
3225 | extent = btrfs_item_ptr(l, slot, | |
3226 | struct btrfs_extent_item); | |
3227 | flags = btrfs_extent_flags(l, extent); | |
3228 | generation = btrfs_extent_generation(l, extent); | |
3229 | ||
3230 | if (key.objectid < logical && | |
3231 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { | |
efe120a0 FH |
3232 | btrfs_err(fs_info, |
3233 | "scrub: tree block %llu spanning " | |
3234 | "stripes, ignored. logical=%llu", | |
c1c9ff7c | 3235 | key.objectid, logical); |
a2de733c AJ |
3236 | goto next; |
3237 | } | |
3238 | ||
625f1c8d LB |
3239 | again: |
3240 | extent_logical = key.objectid; | |
3241 | extent_len = bytes; | |
3242 | ||
a2de733c AJ |
3243 | /* |
3244 | * trim extent to this stripe | |
3245 | */ | |
625f1c8d LB |
3246 | if (extent_logical < logical) { |
3247 | extent_len -= logical - extent_logical; | |
3248 | extent_logical = logical; | |
a2de733c | 3249 | } |
625f1c8d | 3250 | if (extent_logical + extent_len > |
a2de733c | 3251 | logical + map->stripe_len) { |
625f1c8d LB |
3252 | extent_len = logical + map->stripe_len - |
3253 | extent_logical; | |
a2de733c AJ |
3254 | } |
3255 | ||
625f1c8d | 3256 | extent_physical = extent_logical - logical + physical; |
ff023aac SB |
3257 | extent_dev = scrub_dev; |
3258 | extent_mirror_num = mirror_num; | |
3259 | if (is_dev_replace) | |
3260 | scrub_remap_extent(fs_info, extent_logical, | |
3261 | extent_len, &extent_physical, | |
3262 | &extent_dev, | |
3263 | &extent_mirror_num); | |
625f1c8d LB |
3264 | |
3265 | ret = btrfs_lookup_csums_range(csum_root, logical, | |
3266 | logical + map->stripe_len - 1, | |
3267 | &sctx->csum_list, 1); | |
3268 | if (ret) | |
3269 | goto out; | |
3270 | ||
ff023aac SB |
3271 | ret = scrub_extent(sctx, extent_logical, extent_len, |
3272 | extent_physical, extent_dev, flags, | |
3273 | generation, extent_mirror_num, | |
115930cb | 3274 | extent_logical - logical + physical); |
a2de733c AJ |
3275 | if (ret) |
3276 | goto out; | |
3277 | ||
d88d46c6 | 3278 | scrub_free_csums(sctx); |
625f1c8d LB |
3279 | if (extent_logical + extent_len < |
3280 | key.objectid + bytes) { | |
3b080b25 WS |
3281 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | |
3282 | BTRFS_BLOCK_GROUP_RAID6)) { | |
3283 | /* | |
3284 | * loop until we find next data stripe | |
3285 | * or we have finished all stripes. | |
3286 | */ | |
5a6ac9ea MX |
3287 | loop: |
3288 | physical += map->stripe_len; | |
3289 | ret = get_raid56_logic_offset(physical, | |
3290 | num, map, &logical, | |
3291 | &stripe_logical); | |
3292 | logical += base; | |
3293 | ||
3294 | if (ret && physical < physical_end) { | |
3295 | stripe_logical += base; | |
3296 | stripe_end = stripe_logical + | |
3297 | increment - 1; | |
3298 | ret = scrub_raid56_parity(sctx, | |
3299 | map, scrub_dev, ppath, | |
3300 | stripe_logical, | |
3301 | stripe_end); | |
3302 | if (ret) | |
3303 | goto out; | |
3304 | goto loop; | |
3305 | } | |
3b080b25 WS |
3306 | } else { |
3307 | physical += map->stripe_len; | |
3308 | logical += increment; | |
3309 | } | |
625f1c8d LB |
3310 | if (logical < key.objectid + bytes) { |
3311 | cond_resched(); | |
3312 | goto again; | |
3313 | } | |
3314 | ||
3b080b25 | 3315 | if (physical >= physical_end) { |
625f1c8d LB |
3316 | stop_loop = 1; |
3317 | break; | |
3318 | } | |
3319 | } | |
a2de733c AJ |
3320 | next: |
3321 | path->slots[0]++; | |
3322 | } | |
71267333 | 3323 | btrfs_release_path(path); |
3b080b25 | 3324 | skip: |
a2de733c AJ |
3325 | logical += increment; |
3326 | physical += map->stripe_len; | |
d9d181c1 | 3327 | spin_lock(&sctx->stat_lock); |
625f1c8d LB |
3328 | if (stop_loop) |
3329 | sctx->stat.last_physical = map->stripes[num].physical + | |
3330 | length; | |
3331 | else | |
3332 | sctx->stat.last_physical = physical; | |
d9d181c1 | 3333 | spin_unlock(&sctx->stat_lock); |
625f1c8d LB |
3334 | if (stop_loop) |
3335 | break; | |
a2de733c | 3336 | } |
ff023aac | 3337 | out: |
a2de733c | 3338 | /* push queued extents */ |
d9d181c1 | 3339 | scrub_submit(sctx); |
ff023aac SB |
3340 | mutex_lock(&sctx->wr_ctx.wr_lock); |
3341 | scrub_wr_submit(sctx); | |
3342 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
a2de733c | 3343 | |
e7786c3a | 3344 | blk_finish_plug(&plug); |
a2de733c | 3345 | btrfs_free_path(path); |
5a6ac9ea | 3346 | btrfs_free_path(ppath); |
a2de733c AJ |
3347 | return ret < 0 ? ret : 0; |
3348 | } | |
3349 | ||
d9d181c1 | 3350 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
a36cf8b8 SB |
3351 | struct btrfs_device *scrub_dev, |
3352 | u64 chunk_tree, u64 chunk_objectid, | |
3353 | u64 chunk_offset, u64 length, | |
ff023aac | 3354 | u64 dev_offset, int is_dev_replace) |
a2de733c AJ |
3355 | { |
3356 | struct btrfs_mapping_tree *map_tree = | |
a36cf8b8 | 3357 | &sctx->dev_root->fs_info->mapping_tree; |
a2de733c AJ |
3358 | struct map_lookup *map; |
3359 | struct extent_map *em; | |
3360 | int i; | |
ff023aac | 3361 | int ret = 0; |
a2de733c AJ |
3362 | |
3363 | read_lock(&map_tree->map_tree.lock); | |
3364 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | |
3365 | read_unlock(&map_tree->map_tree.lock); | |
3366 | ||
3367 | if (!em) | |
3368 | return -EINVAL; | |
3369 | ||
3370 | map = (struct map_lookup *)em->bdev; | |
3371 | if (em->start != chunk_offset) | |
3372 | goto out; | |
3373 | ||
3374 | if (em->len < length) | |
3375 | goto out; | |
3376 | ||
3377 | for (i = 0; i < map->num_stripes; ++i) { | |
a36cf8b8 | 3378 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
859acaf1 | 3379 | map->stripes[i].physical == dev_offset) { |
a36cf8b8 | 3380 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
ff023aac SB |
3381 | chunk_offset, length, |
3382 | is_dev_replace); | |
a2de733c AJ |
3383 | if (ret) |
3384 | goto out; | |
3385 | } | |
3386 | } | |
3387 | out: | |
3388 | free_extent_map(em); | |
3389 | ||
3390 | return ret; | |
3391 | } | |
3392 | ||
3393 | static noinline_for_stack | |
a36cf8b8 | 3394 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
ff023aac SB |
3395 | struct btrfs_device *scrub_dev, u64 start, u64 end, |
3396 | int is_dev_replace) | |
a2de733c AJ |
3397 | { |
3398 | struct btrfs_dev_extent *dev_extent = NULL; | |
3399 | struct btrfs_path *path; | |
a36cf8b8 | 3400 | struct btrfs_root *root = sctx->dev_root; |
a2de733c AJ |
3401 | struct btrfs_fs_info *fs_info = root->fs_info; |
3402 | u64 length; | |
3403 | u64 chunk_tree; | |
3404 | u64 chunk_objectid; | |
3405 | u64 chunk_offset; | |
3406 | int ret; | |
3407 | int slot; | |
3408 | struct extent_buffer *l; | |
3409 | struct btrfs_key key; | |
3410 | struct btrfs_key found_key; | |
3411 | struct btrfs_block_group_cache *cache; | |
ff023aac | 3412 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
a2de733c AJ |
3413 | |
3414 | path = btrfs_alloc_path(); | |
3415 | if (!path) | |
3416 | return -ENOMEM; | |
3417 | ||
3418 | path->reada = 2; | |
3419 | path->search_commit_root = 1; | |
3420 | path->skip_locking = 1; | |
3421 | ||
a36cf8b8 | 3422 | key.objectid = scrub_dev->devid; |
a2de733c AJ |
3423 | key.offset = 0ull; |
3424 | key.type = BTRFS_DEV_EXTENT_KEY; | |
3425 | ||
a2de733c AJ |
3426 | while (1) { |
3427 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3428 | if (ret < 0) | |
8c51032f AJ |
3429 | break; |
3430 | if (ret > 0) { | |
3431 | if (path->slots[0] >= | |
3432 | btrfs_header_nritems(path->nodes[0])) { | |
3433 | ret = btrfs_next_leaf(root, path); | |
3434 | if (ret) | |
3435 | break; | |
3436 | } | |
3437 | } | |
a2de733c AJ |
3438 | |
3439 | l = path->nodes[0]; | |
3440 | slot = path->slots[0]; | |
3441 | ||
3442 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
3443 | ||
a36cf8b8 | 3444 | if (found_key.objectid != scrub_dev->devid) |
a2de733c AJ |
3445 | break; |
3446 | ||
962a298f | 3447 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) |
a2de733c AJ |
3448 | break; |
3449 | ||
3450 | if (found_key.offset >= end) | |
3451 | break; | |
3452 | ||
3453 | if (found_key.offset < key.offset) | |
3454 | break; | |
3455 | ||
3456 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
3457 | length = btrfs_dev_extent_length(l, dev_extent); | |
3458 | ||
ced96edc QW |
3459 | if (found_key.offset + length <= start) |
3460 | goto skip; | |
a2de733c AJ |
3461 | |
3462 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
3463 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
3464 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
3465 | ||
3466 | /* | |
3467 | * get a reference on the corresponding block group to prevent | |
3468 | * the chunk from going away while we scrub it | |
3469 | */ | |
3470 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
ced96edc QW |
3471 | |
3472 | /* some chunks are removed but not committed to disk yet, | |
3473 | * continue scrubbing */ | |
3474 | if (!cache) | |
3475 | goto skip; | |
3476 | ||
ff023aac SB |
3477 | dev_replace->cursor_right = found_key.offset + length; |
3478 | dev_replace->cursor_left = found_key.offset; | |
3479 | dev_replace->item_needs_writeback = 1; | |
a36cf8b8 | 3480 | ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid, |
ff023aac SB |
3481 | chunk_offset, length, found_key.offset, |
3482 | is_dev_replace); | |
3483 | ||
3484 | /* | |
3485 | * flush, submit all pending read and write bios, afterwards | |
3486 | * wait for them. | |
3487 | * Note that in the dev replace case, a read request causes | |
3488 | * write requests that are submitted in the read completion | |
3489 | * worker. Therefore in the current situation, it is required | |
3490 | * that all write requests are flushed, so that all read and | |
3491 | * write requests are really completed when bios_in_flight | |
3492 | * changes to 0. | |
3493 | */ | |
3494 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); | |
3495 | scrub_submit(sctx); | |
3496 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
3497 | scrub_wr_submit(sctx); | |
3498 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
3499 | ||
3500 | wait_event(sctx->list_wait, | |
3501 | atomic_read(&sctx->bios_in_flight) == 0); | |
12cf9372 WS |
3502 | atomic_inc(&fs_info->scrubs_paused); |
3503 | wake_up(&fs_info->scrub_pause_wait); | |
3504 | ||
3505 | /* | |
3506 | * must be called before we decrease @scrub_paused. | |
3507 | * make sure we don't block transaction commit while | |
3508 | * we are waiting pending workers finished. | |
3509 | */ | |
ff023aac SB |
3510 | wait_event(sctx->list_wait, |
3511 | atomic_read(&sctx->workers_pending) == 0); | |
12cf9372 WS |
3512 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
3513 | ||
3514 | mutex_lock(&fs_info->scrub_lock); | |
3515 | __scrub_blocked_if_needed(fs_info); | |
3516 | atomic_dec(&fs_info->scrubs_paused); | |
3517 | mutex_unlock(&fs_info->scrub_lock); | |
3518 | wake_up(&fs_info->scrub_pause_wait); | |
ff023aac | 3519 | |
a2de733c AJ |
3520 | btrfs_put_block_group(cache); |
3521 | if (ret) | |
3522 | break; | |
af1be4f8 SB |
3523 | if (is_dev_replace && |
3524 | atomic64_read(&dev_replace->num_write_errors) > 0) { | |
ff023aac SB |
3525 | ret = -EIO; |
3526 | break; | |
3527 | } | |
3528 | if (sctx->stat.malloc_errors > 0) { | |
3529 | ret = -ENOMEM; | |
3530 | break; | |
3531 | } | |
a2de733c | 3532 | |
539f358a ID |
3533 | dev_replace->cursor_left = dev_replace->cursor_right; |
3534 | dev_replace->item_needs_writeback = 1; | |
ced96edc | 3535 | skip: |
a2de733c | 3536 | key.offset = found_key.offset + length; |
71267333 | 3537 | btrfs_release_path(path); |
a2de733c AJ |
3538 | } |
3539 | ||
a2de733c | 3540 | btrfs_free_path(path); |
8c51032f AJ |
3541 | |
3542 | /* | |
3543 | * ret can still be 1 from search_slot or next_leaf, | |
3544 | * that's not an error | |
3545 | */ | |
3546 | return ret < 0 ? ret : 0; | |
a2de733c AJ |
3547 | } |
3548 | ||
a36cf8b8 SB |
3549 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
3550 | struct btrfs_device *scrub_dev) | |
a2de733c AJ |
3551 | { |
3552 | int i; | |
3553 | u64 bytenr; | |
3554 | u64 gen; | |
3555 | int ret; | |
a36cf8b8 | 3556 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 3557 | |
87533c47 | 3558 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
79787eaa JM |
3559 | return -EIO; |
3560 | ||
5f546063 MX |
3561 | /* Seed devices of a new filesystem has their own generation. */ |
3562 | if (scrub_dev->fs_devices != root->fs_info->fs_devices) | |
3563 | gen = scrub_dev->generation; | |
3564 | else | |
3565 | gen = root->fs_info->last_trans_committed; | |
a2de733c AJ |
3566 | |
3567 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
3568 | bytenr = btrfs_sb_offset(i); | |
935e5cc9 MX |
3569 | if (bytenr + BTRFS_SUPER_INFO_SIZE > |
3570 | scrub_dev->commit_total_bytes) | |
a2de733c AJ |
3571 | break; |
3572 | ||
d9d181c1 | 3573 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
a36cf8b8 | 3574 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
ff023aac | 3575 | NULL, 1, bytenr); |
a2de733c AJ |
3576 | if (ret) |
3577 | return ret; | |
3578 | } | |
b6bfebc1 | 3579 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3580 | |
3581 | return 0; | |
3582 | } | |
3583 | ||
3584 | /* | |
3585 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
3586 | */ | |
ff023aac SB |
3587 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
3588 | int is_dev_replace) | |
a2de733c | 3589 | { |
0dc3b84a | 3590 | int ret = 0; |
0339ef2f QW |
3591 | int flags = WQ_FREEZABLE | WQ_UNBOUND; |
3592 | int max_active = fs_info->thread_pool_size; | |
a2de733c | 3593 | |
632dd772 | 3594 | if (fs_info->scrub_workers_refcnt == 0) { |
ff023aac | 3595 | if (is_dev_replace) |
0339ef2f QW |
3596 | fs_info->scrub_workers = |
3597 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
3598 | 1, 4); | |
ff023aac | 3599 | else |
0339ef2f QW |
3600 | fs_info->scrub_workers = |
3601 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
3602 | max_active, 4); | |
3603 | if (!fs_info->scrub_workers) { | |
3604 | ret = -ENOMEM; | |
0dc3b84a | 3605 | goto out; |
0339ef2f QW |
3606 | } |
3607 | fs_info->scrub_wr_completion_workers = | |
3608 | btrfs_alloc_workqueue("btrfs-scrubwrc", flags, | |
3609 | max_active, 2); | |
3610 | if (!fs_info->scrub_wr_completion_workers) { | |
3611 | ret = -ENOMEM; | |
ff023aac | 3612 | goto out; |
0339ef2f QW |
3613 | } |
3614 | fs_info->scrub_nocow_workers = | |
3615 | btrfs_alloc_workqueue("btrfs-scrubnc", flags, 1, 0); | |
3616 | if (!fs_info->scrub_nocow_workers) { | |
3617 | ret = -ENOMEM; | |
ff023aac | 3618 | goto out; |
0339ef2f | 3619 | } |
632dd772 | 3620 | } |
a2de733c | 3621 | ++fs_info->scrub_workers_refcnt; |
0dc3b84a | 3622 | out: |
0dc3b84a | 3623 | return ret; |
a2de733c AJ |
3624 | } |
3625 | ||
aa1b8cd4 | 3626 | static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info) |
a2de733c | 3627 | { |
ff023aac | 3628 | if (--fs_info->scrub_workers_refcnt == 0) { |
0339ef2f QW |
3629 | btrfs_destroy_workqueue(fs_info->scrub_workers); |
3630 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); | |
3631 | btrfs_destroy_workqueue(fs_info->scrub_nocow_workers); | |
ff023aac | 3632 | } |
a2de733c | 3633 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
a2de733c AJ |
3634 | } |
3635 | ||
aa1b8cd4 SB |
3636 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
3637 | u64 end, struct btrfs_scrub_progress *progress, | |
63a212ab | 3638 | int readonly, int is_dev_replace) |
a2de733c | 3639 | { |
d9d181c1 | 3640 | struct scrub_ctx *sctx; |
a2de733c AJ |
3641 | int ret; |
3642 | struct btrfs_device *dev; | |
5d68da3b | 3643 | struct rcu_string *name; |
a2de733c | 3644 | |
aa1b8cd4 | 3645 | if (btrfs_fs_closing(fs_info)) |
a2de733c AJ |
3646 | return -EINVAL; |
3647 | ||
aa1b8cd4 | 3648 | if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) { |
b5d67f64 SB |
3649 | /* |
3650 | * in this case scrub is unable to calculate the checksum | |
3651 | * the way scrub is implemented. Do not handle this | |
3652 | * situation at all because it won't ever happen. | |
3653 | */ | |
efe120a0 FH |
3654 | btrfs_err(fs_info, |
3655 | "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails", | |
aa1b8cd4 | 3656 | fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN); |
b5d67f64 SB |
3657 | return -EINVAL; |
3658 | } | |
3659 | ||
aa1b8cd4 | 3660 | if (fs_info->chunk_root->sectorsize != PAGE_SIZE) { |
b5d67f64 | 3661 | /* not supported for data w/o checksums */ |
efe120a0 FH |
3662 | btrfs_err(fs_info, |
3663 | "scrub: size assumption sectorsize != PAGE_SIZE " | |
3664 | "(%d != %lu) fails", | |
27f9f023 | 3665 | fs_info->chunk_root->sectorsize, PAGE_SIZE); |
a2de733c AJ |
3666 | return -EINVAL; |
3667 | } | |
3668 | ||
7a9e9987 SB |
3669 | if (fs_info->chunk_root->nodesize > |
3670 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || | |
3671 | fs_info->chunk_root->sectorsize > | |
3672 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { | |
3673 | /* | |
3674 | * would exhaust the array bounds of pagev member in | |
3675 | * struct scrub_block | |
3676 | */ | |
efe120a0 FH |
3677 | btrfs_err(fs_info, "scrub: size assumption nodesize and sectorsize " |
3678 | "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails", | |
7a9e9987 SB |
3679 | fs_info->chunk_root->nodesize, |
3680 | SCRUB_MAX_PAGES_PER_BLOCK, | |
3681 | fs_info->chunk_root->sectorsize, | |
3682 | SCRUB_MAX_PAGES_PER_BLOCK); | |
3683 | return -EINVAL; | |
3684 | } | |
3685 | ||
a2de733c | 3686 | |
aa1b8cd4 SB |
3687 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
3688 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); | |
63a212ab | 3689 | if (!dev || (dev->missing && !is_dev_replace)) { |
aa1b8cd4 | 3690 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
3691 | return -ENODEV; |
3692 | } | |
a2de733c | 3693 | |
5d68da3b MX |
3694 | if (!is_dev_replace && !readonly && !dev->writeable) { |
3695 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
3696 | rcu_read_lock(); | |
3697 | name = rcu_dereference(dev->name); | |
3698 | btrfs_err(fs_info, "scrub: device %s is not writable", | |
3699 | name->str); | |
3700 | rcu_read_unlock(); | |
3701 | return -EROFS; | |
3702 | } | |
3703 | ||
3b7a016f | 3704 | mutex_lock(&fs_info->scrub_lock); |
63a212ab | 3705 | if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) { |
a2de733c | 3706 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3707 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
aa1b8cd4 | 3708 | return -EIO; |
a2de733c AJ |
3709 | } |
3710 | ||
8dabb742 SB |
3711 | btrfs_dev_replace_lock(&fs_info->dev_replace); |
3712 | if (dev->scrub_device || | |
3713 | (!is_dev_replace && | |
3714 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { | |
3715 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
a2de733c | 3716 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3717 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
3718 | return -EINPROGRESS; |
3719 | } | |
8dabb742 | 3720 | btrfs_dev_replace_unlock(&fs_info->dev_replace); |
3b7a016f WS |
3721 | |
3722 | ret = scrub_workers_get(fs_info, is_dev_replace); | |
3723 | if (ret) { | |
3724 | mutex_unlock(&fs_info->scrub_lock); | |
3725 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
3726 | return ret; | |
3727 | } | |
3728 | ||
63a212ab | 3729 | sctx = scrub_setup_ctx(dev, is_dev_replace); |
d9d181c1 | 3730 | if (IS_ERR(sctx)) { |
a2de733c | 3731 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 SB |
3732 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
3733 | scrub_workers_put(fs_info); | |
d9d181c1 | 3734 | return PTR_ERR(sctx); |
a2de733c | 3735 | } |
d9d181c1 SB |
3736 | sctx->readonly = readonly; |
3737 | dev->scrub_device = sctx; | |
3cb0929a | 3738 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 3739 | |
3cb0929a WS |
3740 | /* |
3741 | * checking @scrub_pause_req here, we can avoid | |
3742 | * race between committing transaction and scrubbing. | |
3743 | */ | |
cb7ab021 | 3744 | __scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3745 | atomic_inc(&fs_info->scrubs_running); |
3746 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c | 3747 | |
ff023aac | 3748 | if (!is_dev_replace) { |
9b011adf WS |
3749 | /* |
3750 | * by holding device list mutex, we can | |
3751 | * kick off writing super in log tree sync. | |
3752 | */ | |
3cb0929a | 3753 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3754 | ret = scrub_supers(sctx, dev); |
3cb0929a | 3755 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3756 | } |
a2de733c AJ |
3757 | |
3758 | if (!ret) | |
ff023aac SB |
3759 | ret = scrub_enumerate_chunks(sctx, dev, start, end, |
3760 | is_dev_replace); | |
a2de733c | 3761 | |
b6bfebc1 | 3762 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3763 | atomic_dec(&fs_info->scrubs_running); |
3764 | wake_up(&fs_info->scrub_pause_wait); | |
3765 | ||
b6bfebc1 | 3766 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
0ef8e451 | 3767 | |
a2de733c | 3768 | if (progress) |
d9d181c1 | 3769 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
a2de733c AJ |
3770 | |
3771 | mutex_lock(&fs_info->scrub_lock); | |
3772 | dev->scrub_device = NULL; | |
3b7a016f | 3773 | scrub_workers_put(fs_info); |
a2de733c AJ |
3774 | mutex_unlock(&fs_info->scrub_lock); |
3775 | ||
d9d181c1 | 3776 | scrub_free_ctx(sctx); |
a2de733c AJ |
3777 | |
3778 | return ret; | |
3779 | } | |
3780 | ||
143bede5 | 3781 | void btrfs_scrub_pause(struct btrfs_root *root) |
a2de733c AJ |
3782 | { |
3783 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3784 | ||
3785 | mutex_lock(&fs_info->scrub_lock); | |
3786 | atomic_inc(&fs_info->scrub_pause_req); | |
3787 | while (atomic_read(&fs_info->scrubs_paused) != | |
3788 | atomic_read(&fs_info->scrubs_running)) { | |
3789 | mutex_unlock(&fs_info->scrub_lock); | |
3790 | wait_event(fs_info->scrub_pause_wait, | |
3791 | atomic_read(&fs_info->scrubs_paused) == | |
3792 | atomic_read(&fs_info->scrubs_running)); | |
3793 | mutex_lock(&fs_info->scrub_lock); | |
3794 | } | |
3795 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c AJ |
3796 | } |
3797 | ||
143bede5 | 3798 | void btrfs_scrub_continue(struct btrfs_root *root) |
a2de733c AJ |
3799 | { |
3800 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3801 | ||
3802 | atomic_dec(&fs_info->scrub_pause_req); | |
3803 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
3804 | } |
3805 | ||
aa1b8cd4 | 3806 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
a2de733c | 3807 | { |
a2de733c AJ |
3808 | mutex_lock(&fs_info->scrub_lock); |
3809 | if (!atomic_read(&fs_info->scrubs_running)) { | |
3810 | mutex_unlock(&fs_info->scrub_lock); | |
3811 | return -ENOTCONN; | |
3812 | } | |
3813 | ||
3814 | atomic_inc(&fs_info->scrub_cancel_req); | |
3815 | while (atomic_read(&fs_info->scrubs_running)) { | |
3816 | mutex_unlock(&fs_info->scrub_lock); | |
3817 | wait_event(fs_info->scrub_pause_wait, | |
3818 | atomic_read(&fs_info->scrubs_running) == 0); | |
3819 | mutex_lock(&fs_info->scrub_lock); | |
3820 | } | |
3821 | atomic_dec(&fs_info->scrub_cancel_req); | |
3822 | mutex_unlock(&fs_info->scrub_lock); | |
3823 | ||
3824 | return 0; | |
3825 | } | |
3826 | ||
aa1b8cd4 SB |
3827 | int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info, |
3828 | struct btrfs_device *dev) | |
49b25e05 | 3829 | { |
d9d181c1 | 3830 | struct scrub_ctx *sctx; |
a2de733c AJ |
3831 | |
3832 | mutex_lock(&fs_info->scrub_lock); | |
d9d181c1 SB |
3833 | sctx = dev->scrub_device; |
3834 | if (!sctx) { | |
a2de733c AJ |
3835 | mutex_unlock(&fs_info->scrub_lock); |
3836 | return -ENOTCONN; | |
3837 | } | |
d9d181c1 | 3838 | atomic_inc(&sctx->cancel_req); |
a2de733c AJ |
3839 | while (dev->scrub_device) { |
3840 | mutex_unlock(&fs_info->scrub_lock); | |
3841 | wait_event(fs_info->scrub_pause_wait, | |
3842 | dev->scrub_device == NULL); | |
3843 | mutex_lock(&fs_info->scrub_lock); | |
3844 | } | |
3845 | mutex_unlock(&fs_info->scrub_lock); | |
3846 | ||
3847 | return 0; | |
3848 | } | |
1623edeb | 3849 | |
a2de733c AJ |
3850 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, |
3851 | struct btrfs_scrub_progress *progress) | |
3852 | { | |
3853 | struct btrfs_device *dev; | |
d9d181c1 | 3854 | struct scrub_ctx *sctx = NULL; |
a2de733c AJ |
3855 | |
3856 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
aa1b8cd4 | 3857 | dev = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
a2de733c | 3858 | if (dev) |
d9d181c1 SB |
3859 | sctx = dev->scrub_device; |
3860 | if (sctx) | |
3861 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
a2de733c AJ |
3862 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
3863 | ||
d9d181c1 | 3864 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
a2de733c | 3865 | } |
ff023aac SB |
3866 | |
3867 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
3868 | u64 extent_logical, u64 extent_len, | |
3869 | u64 *extent_physical, | |
3870 | struct btrfs_device **extent_dev, | |
3871 | int *extent_mirror_num) | |
3872 | { | |
3873 | u64 mapped_length; | |
3874 | struct btrfs_bio *bbio = NULL; | |
3875 | int ret; | |
3876 | ||
3877 | mapped_length = extent_len; | |
3878 | ret = btrfs_map_block(fs_info, READ, extent_logical, | |
3879 | &mapped_length, &bbio, 0); | |
3880 | if (ret || !bbio || mapped_length < extent_len || | |
3881 | !bbio->stripes[0].dev->bdev) { | |
3882 | kfree(bbio); | |
3883 | return; | |
3884 | } | |
3885 | ||
3886 | *extent_physical = bbio->stripes[0].physical; | |
3887 | *extent_mirror_num = bbio->mirror_num; | |
3888 | *extent_dev = bbio->stripes[0].dev; | |
3889 | kfree(bbio); | |
3890 | } | |
3891 | ||
3892 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
3893 | struct scrub_wr_ctx *wr_ctx, | |
3894 | struct btrfs_fs_info *fs_info, | |
3895 | struct btrfs_device *dev, | |
3896 | int is_dev_replace) | |
3897 | { | |
3898 | WARN_ON(wr_ctx->wr_curr_bio != NULL); | |
3899 | ||
3900 | mutex_init(&wr_ctx->wr_lock); | |
3901 | wr_ctx->wr_curr_bio = NULL; | |
3902 | if (!is_dev_replace) | |
3903 | return 0; | |
3904 | ||
3905 | WARN_ON(!dev->bdev); | |
3906 | wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO, | |
3907 | bio_get_nr_vecs(dev->bdev)); | |
3908 | wr_ctx->tgtdev = dev; | |
3909 | atomic_set(&wr_ctx->flush_all_writes, 0); | |
3910 | return 0; | |
3911 | } | |
3912 | ||
3913 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx) | |
3914 | { | |
3915 | mutex_lock(&wr_ctx->wr_lock); | |
3916 | kfree(wr_ctx->wr_curr_bio); | |
3917 | wr_ctx->wr_curr_bio = NULL; | |
3918 | mutex_unlock(&wr_ctx->wr_lock); | |
3919 | } | |
3920 | ||
3921 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, | |
3922 | int mirror_num, u64 physical_for_dev_replace) | |
3923 | { | |
3924 | struct scrub_copy_nocow_ctx *nocow_ctx; | |
3925 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
3926 | ||
3927 | nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS); | |
3928 | if (!nocow_ctx) { | |
3929 | spin_lock(&sctx->stat_lock); | |
3930 | sctx->stat.malloc_errors++; | |
3931 | spin_unlock(&sctx->stat_lock); | |
3932 | return -ENOMEM; | |
3933 | } | |
3934 | ||
3935 | scrub_pending_trans_workers_inc(sctx); | |
3936 | ||
3937 | nocow_ctx->sctx = sctx; | |
3938 | nocow_ctx->logical = logical; | |
3939 | nocow_ctx->len = len; | |
3940 | nocow_ctx->mirror_num = mirror_num; | |
3941 | nocow_ctx->physical_for_dev_replace = physical_for_dev_replace; | |
9e0af237 LB |
3942 | btrfs_init_work(&nocow_ctx->work, btrfs_scrubnc_helper, |
3943 | copy_nocow_pages_worker, NULL, NULL); | |
652f25a2 | 3944 | INIT_LIST_HEAD(&nocow_ctx->inodes); |
0339ef2f QW |
3945 | btrfs_queue_work(fs_info->scrub_nocow_workers, |
3946 | &nocow_ctx->work); | |
ff023aac SB |
3947 | |
3948 | return 0; | |
3949 | } | |
3950 | ||
652f25a2 JB |
3951 | static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx) |
3952 | { | |
3953 | struct scrub_copy_nocow_ctx *nocow_ctx = ctx; | |
3954 | struct scrub_nocow_inode *nocow_inode; | |
3955 | ||
3956 | nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS); | |
3957 | if (!nocow_inode) | |
3958 | return -ENOMEM; | |
3959 | nocow_inode->inum = inum; | |
3960 | nocow_inode->offset = offset; | |
3961 | nocow_inode->root = root; | |
3962 | list_add_tail(&nocow_inode->list, &nocow_ctx->inodes); | |
3963 | return 0; | |
3964 | } | |
3965 | ||
3966 | #define COPY_COMPLETE 1 | |
3967 | ||
ff023aac SB |
3968 | static void copy_nocow_pages_worker(struct btrfs_work *work) |
3969 | { | |
3970 | struct scrub_copy_nocow_ctx *nocow_ctx = | |
3971 | container_of(work, struct scrub_copy_nocow_ctx, work); | |
3972 | struct scrub_ctx *sctx = nocow_ctx->sctx; | |
3973 | u64 logical = nocow_ctx->logical; | |
3974 | u64 len = nocow_ctx->len; | |
3975 | int mirror_num = nocow_ctx->mirror_num; | |
3976 | u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; | |
3977 | int ret; | |
3978 | struct btrfs_trans_handle *trans = NULL; | |
3979 | struct btrfs_fs_info *fs_info; | |
3980 | struct btrfs_path *path; | |
3981 | struct btrfs_root *root; | |
3982 | int not_written = 0; | |
3983 | ||
3984 | fs_info = sctx->dev_root->fs_info; | |
3985 | root = fs_info->extent_root; | |
3986 | ||
3987 | path = btrfs_alloc_path(); | |
3988 | if (!path) { | |
3989 | spin_lock(&sctx->stat_lock); | |
3990 | sctx->stat.malloc_errors++; | |
3991 | spin_unlock(&sctx->stat_lock); | |
3992 | not_written = 1; | |
3993 | goto out; | |
3994 | } | |
3995 | ||
3996 | trans = btrfs_join_transaction(root); | |
3997 | if (IS_ERR(trans)) { | |
3998 | not_written = 1; | |
3999 | goto out; | |
4000 | } | |
4001 | ||
4002 | ret = iterate_inodes_from_logical(logical, fs_info, path, | |
652f25a2 | 4003 | record_inode_for_nocow, nocow_ctx); |
ff023aac | 4004 | if (ret != 0 && ret != -ENOENT) { |
efe120a0 FH |
4005 | btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, " |
4006 | "phys %llu, len %llu, mir %u, ret %d", | |
118a0a25 GU |
4007 | logical, physical_for_dev_replace, len, mirror_num, |
4008 | ret); | |
ff023aac SB |
4009 | not_written = 1; |
4010 | goto out; | |
4011 | } | |
4012 | ||
652f25a2 JB |
4013 | btrfs_end_transaction(trans, root); |
4014 | trans = NULL; | |
4015 | while (!list_empty(&nocow_ctx->inodes)) { | |
4016 | struct scrub_nocow_inode *entry; | |
4017 | entry = list_first_entry(&nocow_ctx->inodes, | |
4018 | struct scrub_nocow_inode, | |
4019 | list); | |
4020 | list_del_init(&entry->list); | |
4021 | ret = copy_nocow_pages_for_inode(entry->inum, entry->offset, | |
4022 | entry->root, nocow_ctx); | |
4023 | kfree(entry); | |
4024 | if (ret == COPY_COMPLETE) { | |
4025 | ret = 0; | |
4026 | break; | |
4027 | } else if (ret) { | |
4028 | break; | |
4029 | } | |
4030 | } | |
ff023aac | 4031 | out: |
652f25a2 JB |
4032 | while (!list_empty(&nocow_ctx->inodes)) { |
4033 | struct scrub_nocow_inode *entry; | |
4034 | entry = list_first_entry(&nocow_ctx->inodes, | |
4035 | struct scrub_nocow_inode, | |
4036 | list); | |
4037 | list_del_init(&entry->list); | |
4038 | kfree(entry); | |
4039 | } | |
ff023aac SB |
4040 | if (trans && !IS_ERR(trans)) |
4041 | btrfs_end_transaction(trans, root); | |
4042 | if (not_written) | |
4043 | btrfs_dev_replace_stats_inc(&fs_info->dev_replace. | |
4044 | num_uncorrectable_read_errors); | |
4045 | ||
4046 | btrfs_free_path(path); | |
4047 | kfree(nocow_ctx); | |
4048 | ||
4049 | scrub_pending_trans_workers_dec(sctx); | |
4050 | } | |
4051 | ||
652f25a2 JB |
4052 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, |
4053 | struct scrub_copy_nocow_ctx *nocow_ctx) | |
ff023aac | 4054 | { |
826aa0a8 | 4055 | struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info; |
ff023aac | 4056 | struct btrfs_key key; |
826aa0a8 MX |
4057 | struct inode *inode; |
4058 | struct page *page; | |
ff023aac | 4059 | struct btrfs_root *local_root; |
652f25a2 JB |
4060 | struct btrfs_ordered_extent *ordered; |
4061 | struct extent_map *em; | |
4062 | struct extent_state *cached_state = NULL; | |
4063 | struct extent_io_tree *io_tree; | |
ff023aac | 4064 | u64 physical_for_dev_replace; |
652f25a2 JB |
4065 | u64 len = nocow_ctx->len; |
4066 | u64 lockstart = offset, lockend = offset + len - 1; | |
826aa0a8 | 4067 | unsigned long index; |
6f1c3605 | 4068 | int srcu_index; |
652f25a2 JB |
4069 | int ret = 0; |
4070 | int err = 0; | |
ff023aac SB |
4071 | |
4072 | key.objectid = root; | |
4073 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4074 | key.offset = (u64)-1; | |
6f1c3605 LB |
4075 | |
4076 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
4077 | ||
ff023aac | 4078 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); |
6f1c3605 LB |
4079 | if (IS_ERR(local_root)) { |
4080 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
ff023aac | 4081 | return PTR_ERR(local_root); |
6f1c3605 | 4082 | } |
ff023aac SB |
4083 | |
4084 | key.type = BTRFS_INODE_ITEM_KEY; | |
4085 | key.objectid = inum; | |
4086 | key.offset = 0; | |
4087 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); | |
6f1c3605 | 4088 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
ff023aac SB |
4089 | if (IS_ERR(inode)) |
4090 | return PTR_ERR(inode); | |
4091 | ||
edd1400b MX |
4092 | /* Avoid truncate/dio/punch hole.. */ |
4093 | mutex_lock(&inode->i_mutex); | |
4094 | inode_dio_wait(inode); | |
4095 | ||
ff023aac | 4096 | physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; |
652f25a2 JB |
4097 | io_tree = &BTRFS_I(inode)->io_tree; |
4098 | ||
4099 | lock_extent_bits(io_tree, lockstart, lockend, 0, &cached_state); | |
4100 | ordered = btrfs_lookup_ordered_range(inode, lockstart, len); | |
4101 | if (ordered) { | |
4102 | btrfs_put_ordered_extent(ordered); | |
4103 | goto out_unlock; | |
4104 | } | |
4105 | ||
4106 | em = btrfs_get_extent(inode, NULL, 0, lockstart, len, 0); | |
4107 | if (IS_ERR(em)) { | |
4108 | ret = PTR_ERR(em); | |
4109 | goto out_unlock; | |
4110 | } | |
4111 | ||
4112 | /* | |
4113 | * This extent does not actually cover the logical extent anymore, | |
4114 | * move on to the next inode. | |
4115 | */ | |
4116 | if (em->block_start > nocow_ctx->logical || | |
4117 | em->block_start + em->block_len < nocow_ctx->logical + len) { | |
4118 | free_extent_map(em); | |
4119 | goto out_unlock; | |
4120 | } | |
4121 | free_extent_map(em); | |
4122 | ||
ff023aac | 4123 | while (len >= PAGE_CACHE_SIZE) { |
ff023aac | 4124 | index = offset >> PAGE_CACHE_SHIFT; |
edd1400b | 4125 | again: |
ff023aac SB |
4126 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
4127 | if (!page) { | |
efe120a0 | 4128 | btrfs_err(fs_info, "find_or_create_page() failed"); |
ff023aac | 4129 | ret = -ENOMEM; |
826aa0a8 | 4130 | goto out; |
ff023aac SB |
4131 | } |
4132 | ||
4133 | if (PageUptodate(page)) { | |
4134 | if (PageDirty(page)) | |
4135 | goto next_page; | |
4136 | } else { | |
4137 | ClearPageError(page); | |
652f25a2 JB |
4138 | err = extent_read_full_page_nolock(io_tree, page, |
4139 | btrfs_get_extent, | |
4140 | nocow_ctx->mirror_num); | |
826aa0a8 MX |
4141 | if (err) { |
4142 | ret = err; | |
ff023aac SB |
4143 | goto next_page; |
4144 | } | |
edd1400b | 4145 | |
26b25891 | 4146 | lock_page(page); |
edd1400b MX |
4147 | /* |
4148 | * If the page has been remove from the page cache, | |
4149 | * the data on it is meaningless, because it may be | |
4150 | * old one, the new data may be written into the new | |
4151 | * page in the page cache. | |
4152 | */ | |
4153 | if (page->mapping != inode->i_mapping) { | |
652f25a2 | 4154 | unlock_page(page); |
edd1400b MX |
4155 | page_cache_release(page); |
4156 | goto again; | |
4157 | } | |
ff023aac SB |
4158 | if (!PageUptodate(page)) { |
4159 | ret = -EIO; | |
4160 | goto next_page; | |
4161 | } | |
4162 | } | |
826aa0a8 MX |
4163 | err = write_page_nocow(nocow_ctx->sctx, |
4164 | physical_for_dev_replace, page); | |
4165 | if (err) | |
4166 | ret = err; | |
ff023aac | 4167 | next_page: |
826aa0a8 MX |
4168 | unlock_page(page); |
4169 | page_cache_release(page); | |
4170 | ||
4171 | if (ret) | |
4172 | break; | |
4173 | ||
ff023aac SB |
4174 | offset += PAGE_CACHE_SIZE; |
4175 | physical_for_dev_replace += PAGE_CACHE_SIZE; | |
4176 | len -= PAGE_CACHE_SIZE; | |
4177 | } | |
652f25a2 JB |
4178 | ret = COPY_COMPLETE; |
4179 | out_unlock: | |
4180 | unlock_extent_cached(io_tree, lockstart, lockend, &cached_state, | |
4181 | GFP_NOFS); | |
826aa0a8 | 4182 | out: |
edd1400b | 4183 | mutex_unlock(&inode->i_mutex); |
826aa0a8 | 4184 | iput(inode); |
ff023aac SB |
4185 | return ret; |
4186 | } | |
4187 | ||
4188 | static int write_page_nocow(struct scrub_ctx *sctx, | |
4189 | u64 physical_for_dev_replace, struct page *page) | |
4190 | { | |
4191 | struct bio *bio; | |
4192 | struct btrfs_device *dev; | |
4193 | int ret; | |
ff023aac SB |
4194 | |
4195 | dev = sctx->wr_ctx.tgtdev; | |
4196 | if (!dev) | |
4197 | return -EIO; | |
4198 | if (!dev->bdev) { | |
4199 | printk_ratelimited(KERN_WARNING | |
efe120a0 | 4200 | "BTRFS: scrub write_page_nocow(bdev == NULL) is unexpected!\n"); |
ff023aac SB |
4201 | return -EIO; |
4202 | } | |
9be3395b | 4203 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
ff023aac SB |
4204 | if (!bio) { |
4205 | spin_lock(&sctx->stat_lock); | |
4206 | sctx->stat.malloc_errors++; | |
4207 | spin_unlock(&sctx->stat_lock); | |
4208 | return -ENOMEM; | |
4209 | } | |
4f024f37 KO |
4210 | bio->bi_iter.bi_size = 0; |
4211 | bio->bi_iter.bi_sector = physical_for_dev_replace >> 9; | |
ff023aac SB |
4212 | bio->bi_bdev = dev->bdev; |
4213 | ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); | |
4214 | if (ret != PAGE_CACHE_SIZE) { | |
4215 | leave_with_eio: | |
4216 | bio_put(bio); | |
4217 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); | |
4218 | return -EIO; | |
4219 | } | |
ff023aac | 4220 | |
33879d45 | 4221 | if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) |
ff023aac SB |
4222 | goto leave_with_eio; |
4223 | ||
4224 | bio_put(bio); | |
4225 | return 0; | |
4226 | } |