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; | |
1d4c08e0 | 523 | struct btrfs_key key; |
558540c1 JS |
524 | |
525 | root_key.objectid = root; | |
526 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
527 | root_key.offset = (u64)-1; | |
528 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
529 | if (IS_ERR(local_root)) { | |
530 | ret = PTR_ERR(local_root); | |
531 | goto err; | |
532 | } | |
533 | ||
14692cc1 DS |
534 | /* |
535 | * this makes the path point to (inum INODE_ITEM ioff) | |
536 | */ | |
1d4c08e0 DS |
537 | key.objectid = inum; |
538 | key.type = BTRFS_INODE_ITEM_KEY; | |
539 | key.offset = 0; | |
540 | ||
541 | ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0); | |
558540c1 JS |
542 | if (ret) { |
543 | btrfs_release_path(swarn->path); | |
544 | goto err; | |
545 | } | |
546 | ||
547 | eb = swarn->path->nodes[0]; | |
548 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], | |
549 | struct btrfs_inode_item); | |
550 | isize = btrfs_inode_size(eb, inode_item); | |
551 | nlink = btrfs_inode_nlink(eb, inode_item); | |
552 | btrfs_release_path(swarn->path); | |
553 | ||
554 | ipath = init_ipath(4096, local_root, swarn->path); | |
26bdef54 DC |
555 | if (IS_ERR(ipath)) { |
556 | ret = PTR_ERR(ipath); | |
557 | ipath = NULL; | |
558 | goto err; | |
559 | } | |
558540c1 JS |
560 | ret = paths_from_inode(inum, ipath); |
561 | ||
562 | if (ret < 0) | |
563 | goto err; | |
564 | ||
565 | /* | |
566 | * we deliberately ignore the bit ipath might have been too small to | |
567 | * hold all of the paths here | |
568 | */ | |
569 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) | |
efe120a0 | 570 | printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev " |
558540c1 JS |
571 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " |
572 | "length %llu, links %u (path: %s)\n", swarn->errstr, | |
606686ee | 573 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
574 | (unsigned long long)swarn->sector, root, inum, offset, |
575 | min(isize - offset, (u64)PAGE_SIZE), nlink, | |
745c4d8e | 576 | (char *)(unsigned long)ipath->fspath->val[i]); |
558540c1 JS |
577 | |
578 | free_ipath(ipath); | |
579 | return 0; | |
580 | ||
581 | err: | |
efe120a0 | 582 | printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev " |
558540c1 JS |
583 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " |
584 | "resolving failed with ret=%d\n", swarn->errstr, | |
606686ee | 585 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
586 | (unsigned long long)swarn->sector, root, inum, offset, ret); |
587 | ||
588 | free_ipath(ipath); | |
589 | return 0; | |
590 | } | |
591 | ||
b5d67f64 | 592 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
558540c1 | 593 | { |
a36cf8b8 SB |
594 | struct btrfs_device *dev; |
595 | struct btrfs_fs_info *fs_info; | |
558540c1 JS |
596 | struct btrfs_path *path; |
597 | struct btrfs_key found_key; | |
598 | struct extent_buffer *eb; | |
599 | struct btrfs_extent_item *ei; | |
600 | struct scrub_warning swarn; | |
69917e43 LB |
601 | unsigned long ptr = 0; |
602 | u64 extent_item_pos; | |
603 | u64 flags = 0; | |
558540c1 | 604 | u64 ref_root; |
69917e43 | 605 | u32 item_size; |
558540c1 | 606 | u8 ref_level; |
69917e43 | 607 | int ret; |
558540c1 | 608 | |
a36cf8b8 | 609 | WARN_ON(sblock->page_count < 1); |
7a9e9987 | 610 | dev = sblock->pagev[0]->dev; |
a36cf8b8 SB |
611 | fs_info = sblock->sctx->dev_root->fs_info; |
612 | ||
558540c1 | 613 | path = btrfs_alloc_path(); |
8b9456da DS |
614 | if (!path) |
615 | return; | |
558540c1 | 616 | |
7a9e9987 SB |
617 | swarn.sector = (sblock->pagev[0]->physical) >> 9; |
618 | swarn.logical = sblock->pagev[0]->logical; | |
558540c1 | 619 | swarn.errstr = errstr; |
a36cf8b8 | 620 | swarn.dev = NULL; |
558540c1 | 621 | |
69917e43 LB |
622 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, |
623 | &flags); | |
558540c1 JS |
624 | if (ret < 0) |
625 | goto out; | |
626 | ||
4692cf58 | 627 | extent_item_pos = swarn.logical - found_key.objectid; |
558540c1 JS |
628 | swarn.extent_item_size = found_key.offset; |
629 | ||
630 | eb = path->nodes[0]; | |
631 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); | |
632 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
633 | ||
69917e43 | 634 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
558540c1 | 635 | do { |
6eda71d0 LB |
636 | ret = tree_backref_for_extent(&ptr, eb, &found_key, ei, |
637 | item_size, &ref_root, | |
638 | &ref_level); | |
606686ee | 639 | printk_in_rcu(KERN_WARNING |
efe120a0 | 640 | "BTRFS: %s at logical %llu on dev %s, " |
558540c1 | 641 | "sector %llu: metadata %s (level %d) in tree " |
606686ee JB |
642 | "%llu\n", errstr, swarn.logical, |
643 | rcu_str_deref(dev->name), | |
558540c1 JS |
644 | (unsigned long long)swarn.sector, |
645 | ref_level ? "node" : "leaf", | |
646 | ret < 0 ? -1 : ref_level, | |
647 | ret < 0 ? -1 : ref_root); | |
648 | } while (ret != 1); | |
d8fe29e9 | 649 | btrfs_release_path(path); |
558540c1 | 650 | } else { |
d8fe29e9 | 651 | btrfs_release_path(path); |
558540c1 | 652 | swarn.path = path; |
a36cf8b8 | 653 | swarn.dev = dev; |
7a3ae2f8 JS |
654 | iterate_extent_inodes(fs_info, found_key.objectid, |
655 | extent_item_pos, 1, | |
558540c1 JS |
656 | scrub_print_warning_inode, &swarn); |
657 | } | |
658 | ||
659 | out: | |
660 | btrfs_free_path(path); | |
558540c1 JS |
661 | } |
662 | ||
ff023aac | 663 | static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx) |
0ef8e451 | 664 | { |
5da6fcbc | 665 | struct page *page = NULL; |
0ef8e451 | 666 | unsigned long index; |
ff023aac | 667 | struct scrub_fixup_nodatasum *fixup = fixup_ctx; |
0ef8e451 | 668 | int ret; |
5da6fcbc | 669 | int corrected = 0; |
0ef8e451 | 670 | struct btrfs_key key; |
5da6fcbc | 671 | struct inode *inode = NULL; |
6f1c3605 | 672 | struct btrfs_fs_info *fs_info; |
0ef8e451 JS |
673 | u64 end = offset + PAGE_SIZE - 1; |
674 | struct btrfs_root *local_root; | |
6f1c3605 | 675 | int srcu_index; |
0ef8e451 JS |
676 | |
677 | key.objectid = root; | |
678 | key.type = BTRFS_ROOT_ITEM_KEY; | |
679 | key.offset = (u64)-1; | |
6f1c3605 LB |
680 | |
681 | fs_info = fixup->root->fs_info; | |
682 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
683 | ||
684 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
685 | if (IS_ERR(local_root)) { | |
686 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 | 687 | return PTR_ERR(local_root); |
6f1c3605 | 688 | } |
0ef8e451 JS |
689 | |
690 | key.type = BTRFS_INODE_ITEM_KEY; | |
691 | key.objectid = inum; | |
692 | key.offset = 0; | |
6f1c3605 LB |
693 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); |
694 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 JS |
695 | if (IS_ERR(inode)) |
696 | return PTR_ERR(inode); | |
697 | ||
0ef8e451 JS |
698 | index = offset >> PAGE_CACHE_SHIFT; |
699 | ||
700 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
5da6fcbc JS |
701 | if (!page) { |
702 | ret = -ENOMEM; | |
703 | goto out; | |
704 | } | |
705 | ||
706 | if (PageUptodate(page)) { | |
5da6fcbc JS |
707 | if (PageDirty(page)) { |
708 | /* | |
709 | * we need to write the data to the defect sector. the | |
710 | * data that was in that sector is not in memory, | |
711 | * because the page was modified. we must not write the | |
712 | * modified page to that sector. | |
713 | * | |
714 | * TODO: what could be done here: wait for the delalloc | |
715 | * runner to write out that page (might involve | |
716 | * COW) and see whether the sector is still | |
717 | * referenced afterwards. | |
718 | * | |
719 | * For the meantime, we'll treat this error | |
720 | * incorrectable, although there is a chance that a | |
721 | * later scrub will find the bad sector again and that | |
722 | * there's no dirty page in memory, then. | |
723 | */ | |
724 | ret = -EIO; | |
725 | goto out; | |
726 | } | |
1203b681 | 727 | ret = repair_io_failure(inode, offset, PAGE_SIZE, |
5da6fcbc | 728 | fixup->logical, page, |
ffdd2018 | 729 | offset - page_offset(page), |
5da6fcbc JS |
730 | fixup->mirror_num); |
731 | unlock_page(page); | |
732 | corrected = !ret; | |
733 | } else { | |
734 | /* | |
735 | * we need to get good data first. the general readpage path | |
736 | * will call repair_io_failure for us, we just have to make | |
737 | * sure we read the bad mirror. | |
738 | */ | |
739 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
740 | EXTENT_DAMAGED, GFP_NOFS); | |
741 | if (ret) { | |
742 | /* set_extent_bits should give proper error */ | |
743 | WARN_ON(ret > 0); | |
744 | if (ret > 0) | |
745 | ret = -EFAULT; | |
746 | goto out; | |
747 | } | |
748 | ||
749 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, | |
750 | btrfs_get_extent, | |
751 | fixup->mirror_num); | |
752 | wait_on_page_locked(page); | |
753 | ||
754 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, | |
755 | end, EXTENT_DAMAGED, 0, NULL); | |
756 | if (!corrected) | |
757 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
758 | EXTENT_DAMAGED, GFP_NOFS); | |
759 | } | |
760 | ||
761 | out: | |
762 | if (page) | |
763 | put_page(page); | |
7fb18a06 TK |
764 | |
765 | iput(inode); | |
0ef8e451 JS |
766 | |
767 | if (ret < 0) | |
768 | return ret; | |
769 | ||
770 | if (ret == 0 && corrected) { | |
771 | /* | |
772 | * we only need to call readpage for one of the inodes belonging | |
773 | * to this extent. so make iterate_extent_inodes stop | |
774 | */ | |
775 | return 1; | |
776 | } | |
777 | ||
778 | return -EIO; | |
779 | } | |
780 | ||
781 | static void scrub_fixup_nodatasum(struct btrfs_work *work) | |
782 | { | |
783 | int ret; | |
784 | struct scrub_fixup_nodatasum *fixup; | |
d9d181c1 | 785 | struct scrub_ctx *sctx; |
0ef8e451 | 786 | struct btrfs_trans_handle *trans = NULL; |
0ef8e451 JS |
787 | struct btrfs_path *path; |
788 | int uncorrectable = 0; | |
789 | ||
790 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); | |
d9d181c1 | 791 | sctx = fixup->sctx; |
0ef8e451 JS |
792 | |
793 | path = btrfs_alloc_path(); | |
794 | if (!path) { | |
d9d181c1 SB |
795 | spin_lock(&sctx->stat_lock); |
796 | ++sctx->stat.malloc_errors; | |
797 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
798 | uncorrectable = 1; |
799 | goto out; | |
800 | } | |
801 | ||
802 | trans = btrfs_join_transaction(fixup->root); | |
803 | if (IS_ERR(trans)) { | |
804 | uncorrectable = 1; | |
805 | goto out; | |
806 | } | |
807 | ||
808 | /* | |
809 | * the idea is to trigger a regular read through the standard path. we | |
810 | * read a page from the (failed) logical address by specifying the | |
811 | * corresponding copynum of the failed sector. thus, that readpage is | |
812 | * expected to fail. | |
813 | * that is the point where on-the-fly error correction will kick in | |
814 | * (once it's finished) and rewrite the failed sector if a good copy | |
815 | * can be found. | |
816 | */ | |
817 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, | |
818 | path, scrub_fixup_readpage, | |
819 | fixup); | |
820 | if (ret < 0) { | |
821 | uncorrectable = 1; | |
822 | goto out; | |
823 | } | |
824 | WARN_ON(ret != 1); | |
825 | ||
d9d181c1 SB |
826 | spin_lock(&sctx->stat_lock); |
827 | ++sctx->stat.corrected_errors; | |
828 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
829 | |
830 | out: | |
831 | if (trans && !IS_ERR(trans)) | |
832 | btrfs_end_transaction(trans, fixup->root); | |
833 | if (uncorrectable) { | |
d9d181c1 SB |
834 | spin_lock(&sctx->stat_lock); |
835 | ++sctx->stat.uncorrectable_errors; | |
836 | spin_unlock(&sctx->stat_lock); | |
ff023aac SB |
837 | btrfs_dev_replace_stats_inc( |
838 | &sctx->dev_root->fs_info->dev_replace. | |
839 | num_uncorrectable_read_errors); | |
efe120a0 FH |
840 | printk_ratelimited_in_rcu(KERN_ERR "BTRFS: " |
841 | "unable to fixup (nodatasum) error at logical %llu on dev %s\n", | |
c1c9ff7c | 842 | fixup->logical, rcu_str_deref(fixup->dev->name)); |
0ef8e451 JS |
843 | } |
844 | ||
845 | btrfs_free_path(path); | |
846 | kfree(fixup); | |
847 | ||
b6bfebc1 | 848 | scrub_pending_trans_workers_dec(sctx); |
0ef8e451 JS |
849 | } |
850 | ||
af8e2d1d MX |
851 | static inline void scrub_get_recover(struct scrub_recover *recover) |
852 | { | |
853 | atomic_inc(&recover->refs); | |
854 | } | |
855 | ||
856 | static inline void scrub_put_recover(struct scrub_recover *recover) | |
857 | { | |
858 | if (atomic_dec_and_test(&recover->refs)) { | |
859 | kfree(recover->bbio); | |
860 | kfree(recover->raid_map); | |
861 | kfree(recover); | |
862 | } | |
863 | } | |
864 | ||
a2de733c | 865 | /* |
b5d67f64 SB |
866 | * scrub_handle_errored_block gets called when either verification of the |
867 | * pages failed or the bio failed to read, e.g. with EIO. In the latter | |
868 | * case, this function handles all pages in the bio, even though only one | |
869 | * may be bad. | |
870 | * The goal of this function is to repair the errored block by using the | |
871 | * contents of one of the mirrors. | |
a2de733c | 872 | */ |
b5d67f64 | 873 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
a2de733c | 874 | { |
d9d181c1 | 875 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
a36cf8b8 | 876 | struct btrfs_device *dev; |
b5d67f64 SB |
877 | struct btrfs_fs_info *fs_info; |
878 | u64 length; | |
879 | u64 logical; | |
880 | u64 generation; | |
881 | unsigned int failed_mirror_index; | |
882 | unsigned int is_metadata; | |
883 | unsigned int have_csum; | |
884 | u8 *csum; | |
885 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ | |
886 | struct scrub_block *sblock_bad; | |
887 | int ret; | |
888 | int mirror_index; | |
889 | int page_num; | |
890 | int success; | |
558540c1 | 891 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
b5d67f64 SB |
892 | DEFAULT_RATELIMIT_BURST); |
893 | ||
894 | BUG_ON(sblock_to_check->page_count < 1); | |
a36cf8b8 | 895 | fs_info = sctx->dev_root->fs_info; |
4ded4f63 SB |
896 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
897 | /* | |
898 | * if we find an error in a super block, we just report it. | |
899 | * They will get written with the next transaction commit | |
900 | * anyway | |
901 | */ | |
902 | spin_lock(&sctx->stat_lock); | |
903 | ++sctx->stat.super_errors; | |
904 | spin_unlock(&sctx->stat_lock); | |
905 | return 0; | |
906 | } | |
b5d67f64 | 907 | length = sblock_to_check->page_count * PAGE_SIZE; |
7a9e9987 SB |
908 | logical = sblock_to_check->pagev[0]->logical; |
909 | generation = sblock_to_check->pagev[0]->generation; | |
910 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); | |
911 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; | |
912 | is_metadata = !(sblock_to_check->pagev[0]->flags & | |
b5d67f64 | 913 | BTRFS_EXTENT_FLAG_DATA); |
7a9e9987 SB |
914 | have_csum = sblock_to_check->pagev[0]->have_csum; |
915 | csum = sblock_to_check->pagev[0]->csum; | |
916 | dev = sblock_to_check->pagev[0]->dev; | |
13db62b7 | 917 | |
ff023aac SB |
918 | if (sctx->is_dev_replace && !is_metadata && !have_csum) { |
919 | sblocks_for_recheck = NULL; | |
920 | goto nodatasum_case; | |
921 | } | |
922 | ||
b5d67f64 SB |
923 | /* |
924 | * read all mirrors one after the other. This includes to | |
925 | * re-read the extent or metadata block that failed (that was | |
926 | * the cause that this fixup code is called) another time, | |
927 | * page by page this time in order to know which pages | |
928 | * caused I/O errors and which ones are good (for all mirrors). | |
929 | * It is the goal to handle the situation when more than one | |
930 | * mirror contains I/O errors, but the errors do not | |
931 | * overlap, i.e. the data can be repaired by selecting the | |
932 | * pages from those mirrors without I/O error on the | |
933 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) | |
934 | * would be that mirror #1 has an I/O error on the first page, | |
935 | * the second page is good, and mirror #2 has an I/O error on | |
936 | * the second page, but the first page is good. | |
937 | * Then the first page of the first mirror can be repaired by | |
938 | * taking the first page of the second mirror, and the | |
939 | * second page of the second mirror can be repaired by | |
940 | * copying the contents of the 2nd page of the 1st mirror. | |
941 | * One more note: if the pages of one mirror contain I/O | |
942 | * errors, the checksum cannot be verified. In order to get | |
943 | * the best data for repairing, the first attempt is to find | |
944 | * a mirror without I/O errors and with a validated checksum. | |
945 | * Only if this is not possible, the pages are picked from | |
946 | * mirrors with I/O errors without considering the checksum. | |
947 | * If the latter is the case, at the end, the checksum of the | |
948 | * repaired area is verified in order to correctly maintain | |
949 | * the statistics. | |
950 | */ | |
951 | ||
952 | sblocks_for_recheck = kzalloc(BTRFS_MAX_MIRRORS * | |
953 | sizeof(*sblocks_for_recheck), | |
954 | GFP_NOFS); | |
955 | if (!sblocks_for_recheck) { | |
d9d181c1 SB |
956 | spin_lock(&sctx->stat_lock); |
957 | sctx->stat.malloc_errors++; | |
958 | sctx->stat.read_errors++; | |
959 | sctx->stat.uncorrectable_errors++; | |
960 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 961 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 962 | goto out; |
a2de733c AJ |
963 | } |
964 | ||
b5d67f64 | 965 | /* setup the context, map the logical blocks and alloc the pages */ |
ff023aac | 966 | ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length, |
b5d67f64 SB |
967 | logical, sblocks_for_recheck); |
968 | if (ret) { | |
d9d181c1 SB |
969 | spin_lock(&sctx->stat_lock); |
970 | sctx->stat.read_errors++; | |
971 | sctx->stat.uncorrectable_errors++; | |
972 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 973 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 SB |
974 | goto out; |
975 | } | |
976 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); | |
977 | sblock_bad = sblocks_for_recheck + failed_mirror_index; | |
13db62b7 | 978 | |
b5d67f64 | 979 | /* build and submit the bios for the failed mirror, check checksums */ |
34f5c8e9 | 980 | scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum, |
af8e2d1d | 981 | csum, generation, sctx->csum_size, 1); |
a2de733c | 982 | |
b5d67f64 SB |
983 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
984 | sblock_bad->no_io_error_seen) { | |
985 | /* | |
986 | * the error disappeared after reading page by page, or | |
987 | * the area was part of a huge bio and other parts of the | |
988 | * bio caused I/O errors, or the block layer merged several | |
989 | * read requests into one and the error is caused by a | |
990 | * different bio (usually one of the two latter cases is | |
991 | * the cause) | |
992 | */ | |
d9d181c1 SB |
993 | spin_lock(&sctx->stat_lock); |
994 | sctx->stat.unverified_errors++; | |
5a6ac9ea | 995 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 996 | spin_unlock(&sctx->stat_lock); |
a2de733c | 997 | |
ff023aac SB |
998 | if (sctx->is_dev_replace) |
999 | scrub_write_block_to_dev_replace(sblock_bad); | |
b5d67f64 | 1000 | goto out; |
a2de733c | 1001 | } |
a2de733c | 1002 | |
b5d67f64 | 1003 | if (!sblock_bad->no_io_error_seen) { |
d9d181c1 SB |
1004 | spin_lock(&sctx->stat_lock); |
1005 | sctx->stat.read_errors++; | |
1006 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
1007 | if (__ratelimit(&_rs)) |
1008 | scrub_print_warning("i/o error", sblock_to_check); | |
a36cf8b8 | 1009 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 1010 | } else if (sblock_bad->checksum_error) { |
d9d181c1 SB |
1011 | spin_lock(&sctx->stat_lock); |
1012 | sctx->stat.csum_errors++; | |
1013 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
1014 | if (__ratelimit(&_rs)) |
1015 | scrub_print_warning("checksum error", sblock_to_check); | |
a36cf8b8 | 1016 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 1017 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 1018 | } else if (sblock_bad->header_error) { |
d9d181c1 SB |
1019 | spin_lock(&sctx->stat_lock); |
1020 | sctx->stat.verify_errors++; | |
1021 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
1022 | if (__ratelimit(&_rs)) |
1023 | scrub_print_warning("checksum/header error", | |
1024 | sblock_to_check); | |
442a4f63 | 1025 | if (sblock_bad->generation_error) |
a36cf8b8 | 1026 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 SB |
1027 | BTRFS_DEV_STAT_GENERATION_ERRS); |
1028 | else | |
a36cf8b8 | 1029 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 1030 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 1031 | } |
a2de733c | 1032 | |
33ef30ad ID |
1033 | if (sctx->readonly) { |
1034 | ASSERT(!sctx->is_dev_replace); | |
1035 | goto out; | |
1036 | } | |
a2de733c | 1037 | |
b5d67f64 SB |
1038 | if (!is_metadata && !have_csum) { |
1039 | struct scrub_fixup_nodatasum *fixup_nodatasum; | |
a2de733c | 1040 | |
ff023aac SB |
1041 | nodatasum_case: |
1042 | WARN_ON(sctx->is_dev_replace); | |
1043 | ||
b5d67f64 SB |
1044 | /* |
1045 | * !is_metadata and !have_csum, this means that the data | |
1046 | * might not be COW'ed, that it might be modified | |
1047 | * concurrently. The general strategy to work on the | |
1048 | * commit root does not help in the case when COW is not | |
1049 | * used. | |
1050 | */ | |
1051 | fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS); | |
1052 | if (!fixup_nodatasum) | |
1053 | goto did_not_correct_error; | |
d9d181c1 | 1054 | fixup_nodatasum->sctx = sctx; |
a36cf8b8 | 1055 | fixup_nodatasum->dev = dev; |
b5d67f64 SB |
1056 | fixup_nodatasum->logical = logical; |
1057 | fixup_nodatasum->root = fs_info->extent_root; | |
1058 | fixup_nodatasum->mirror_num = failed_mirror_index + 1; | |
b6bfebc1 | 1059 | scrub_pending_trans_workers_inc(sctx); |
9e0af237 LB |
1060 | btrfs_init_work(&fixup_nodatasum->work, btrfs_scrub_helper, |
1061 | scrub_fixup_nodatasum, NULL, NULL); | |
0339ef2f QW |
1062 | btrfs_queue_work(fs_info->scrub_workers, |
1063 | &fixup_nodatasum->work); | |
b5d67f64 | 1064 | goto out; |
a2de733c AJ |
1065 | } |
1066 | ||
b5d67f64 SB |
1067 | /* |
1068 | * now build and submit the bios for the other mirrors, check | |
cb2ced73 SB |
1069 | * checksums. |
1070 | * First try to pick the mirror which is completely without I/O | |
b5d67f64 SB |
1071 | * errors and also does not have a checksum error. |
1072 | * If one is found, and if a checksum is present, the full block | |
1073 | * that is known to contain an error is rewritten. Afterwards | |
1074 | * the block is known to be corrected. | |
1075 | * If a mirror is found which is completely correct, and no | |
1076 | * checksum is present, only those pages are rewritten that had | |
1077 | * an I/O error in the block to be repaired, since it cannot be | |
1078 | * determined, which copy of the other pages is better (and it | |
1079 | * could happen otherwise that a correct page would be | |
1080 | * overwritten by a bad one). | |
1081 | */ | |
1082 | for (mirror_index = 0; | |
1083 | mirror_index < BTRFS_MAX_MIRRORS && | |
1084 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1085 | mirror_index++) { | |
cb2ced73 | 1086 | struct scrub_block *sblock_other; |
b5d67f64 | 1087 | |
cb2ced73 SB |
1088 | if (mirror_index == failed_mirror_index) |
1089 | continue; | |
1090 | sblock_other = sblocks_for_recheck + mirror_index; | |
1091 | ||
1092 | /* build and submit the bios, check checksums */ | |
34f5c8e9 SB |
1093 | scrub_recheck_block(fs_info, sblock_other, is_metadata, |
1094 | have_csum, csum, generation, | |
af8e2d1d | 1095 | sctx->csum_size, 0); |
34f5c8e9 SB |
1096 | |
1097 | if (!sblock_other->header_error && | |
b5d67f64 SB |
1098 | !sblock_other->checksum_error && |
1099 | sblock_other->no_io_error_seen) { | |
ff023aac SB |
1100 | if (sctx->is_dev_replace) { |
1101 | scrub_write_block_to_dev_replace(sblock_other); | |
1102 | } else { | |
1103 | int force_write = is_metadata || have_csum; | |
1104 | ||
1105 | ret = scrub_repair_block_from_good_copy( | |
1106 | sblock_bad, sblock_other, | |
1107 | force_write); | |
1108 | } | |
b5d67f64 SB |
1109 | if (0 == ret) |
1110 | goto corrected_error; | |
1111 | } | |
1112 | } | |
a2de733c AJ |
1113 | |
1114 | /* | |
ff023aac SB |
1115 | * for dev_replace, pick good pages and write to the target device. |
1116 | */ | |
1117 | if (sctx->is_dev_replace) { | |
1118 | success = 1; | |
1119 | for (page_num = 0; page_num < sblock_bad->page_count; | |
1120 | page_num++) { | |
1121 | int sub_success; | |
1122 | ||
1123 | sub_success = 0; | |
1124 | for (mirror_index = 0; | |
1125 | mirror_index < BTRFS_MAX_MIRRORS && | |
1126 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1127 | mirror_index++) { | |
1128 | struct scrub_block *sblock_other = | |
1129 | sblocks_for_recheck + mirror_index; | |
1130 | struct scrub_page *page_other = | |
1131 | sblock_other->pagev[page_num]; | |
1132 | ||
1133 | if (!page_other->io_error) { | |
1134 | ret = scrub_write_page_to_dev_replace( | |
1135 | sblock_other, page_num); | |
1136 | if (ret == 0) { | |
1137 | /* succeeded for this page */ | |
1138 | sub_success = 1; | |
1139 | break; | |
1140 | } else { | |
1141 | btrfs_dev_replace_stats_inc( | |
1142 | &sctx->dev_root-> | |
1143 | fs_info->dev_replace. | |
1144 | num_write_errors); | |
1145 | } | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | if (!sub_success) { | |
1150 | /* | |
1151 | * did not find a mirror to fetch the page | |
1152 | * from. scrub_write_page_to_dev_replace() | |
1153 | * handles this case (page->io_error), by | |
1154 | * filling the block with zeros before | |
1155 | * submitting the write request | |
1156 | */ | |
1157 | success = 0; | |
1158 | ret = scrub_write_page_to_dev_replace( | |
1159 | sblock_bad, page_num); | |
1160 | if (ret) | |
1161 | btrfs_dev_replace_stats_inc( | |
1162 | &sctx->dev_root->fs_info-> | |
1163 | dev_replace.num_write_errors); | |
1164 | } | |
1165 | } | |
1166 | ||
1167 | goto out; | |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | * for regular scrub, repair those pages that are errored. | |
1172 | * In case of I/O errors in the area that is supposed to be | |
b5d67f64 SB |
1173 | * repaired, continue by picking good copies of those pages. |
1174 | * Select the good pages from mirrors to rewrite bad pages from | |
1175 | * the area to fix. Afterwards verify the checksum of the block | |
1176 | * that is supposed to be repaired. This verification step is | |
1177 | * only done for the purpose of statistic counting and for the | |
1178 | * final scrub report, whether errors remain. | |
1179 | * A perfect algorithm could make use of the checksum and try | |
1180 | * all possible combinations of pages from the different mirrors | |
1181 | * until the checksum verification succeeds. For example, when | |
1182 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page | |
1183 | * of mirror #2 is readable but the final checksum test fails, | |
1184 | * then the 2nd page of mirror #3 could be tried, whether now | |
1185 | * the final checksum succeedes. But this would be a rare | |
1186 | * exception and is therefore not implemented. At least it is | |
1187 | * avoided that the good copy is overwritten. | |
1188 | * A more useful improvement would be to pick the sectors | |
1189 | * without I/O error based on sector sizes (512 bytes on legacy | |
1190 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one | |
1191 | * mirror could be repaired by taking 512 byte of a different | |
1192 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE | |
1193 | * area are unreadable. | |
a2de733c | 1194 | */ |
a2de733c | 1195 | |
b5d67f64 SB |
1196 | /* can only fix I/O errors from here on */ |
1197 | if (sblock_bad->no_io_error_seen) | |
1198 | goto did_not_correct_error; | |
1199 | ||
1200 | success = 1; | |
1201 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { | |
7a9e9987 | 1202 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
b5d67f64 SB |
1203 | |
1204 | if (!page_bad->io_error) | |
a2de733c | 1205 | continue; |
b5d67f64 SB |
1206 | |
1207 | for (mirror_index = 0; | |
1208 | mirror_index < BTRFS_MAX_MIRRORS && | |
1209 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1210 | mirror_index++) { | |
1211 | struct scrub_block *sblock_other = sblocks_for_recheck + | |
1212 | mirror_index; | |
7a9e9987 SB |
1213 | struct scrub_page *page_other = sblock_other->pagev[ |
1214 | page_num]; | |
b5d67f64 SB |
1215 | |
1216 | if (!page_other->io_error) { | |
1217 | ret = scrub_repair_page_from_good_copy( | |
1218 | sblock_bad, sblock_other, page_num, 0); | |
1219 | if (0 == ret) { | |
1220 | page_bad->io_error = 0; | |
1221 | break; /* succeeded for this page */ | |
1222 | } | |
1223 | } | |
96e36920 | 1224 | } |
a2de733c | 1225 | |
b5d67f64 SB |
1226 | if (page_bad->io_error) { |
1227 | /* did not find a mirror to copy the page from */ | |
1228 | success = 0; | |
1229 | } | |
a2de733c | 1230 | } |
a2de733c | 1231 | |
b5d67f64 SB |
1232 | if (success) { |
1233 | if (is_metadata || have_csum) { | |
1234 | /* | |
1235 | * need to verify the checksum now that all | |
1236 | * sectors on disk are repaired (the write | |
1237 | * request for data to be repaired is on its way). | |
1238 | * Just be lazy and use scrub_recheck_block() | |
1239 | * which re-reads the data before the checksum | |
1240 | * is verified, but most likely the data comes out | |
1241 | * of the page cache. | |
1242 | */ | |
34f5c8e9 SB |
1243 | scrub_recheck_block(fs_info, sblock_bad, |
1244 | is_metadata, have_csum, csum, | |
af8e2d1d | 1245 | generation, sctx->csum_size, 1); |
34f5c8e9 | 1246 | if (!sblock_bad->header_error && |
b5d67f64 SB |
1247 | !sblock_bad->checksum_error && |
1248 | sblock_bad->no_io_error_seen) | |
1249 | goto corrected_error; | |
1250 | else | |
1251 | goto did_not_correct_error; | |
1252 | } else { | |
1253 | corrected_error: | |
d9d181c1 SB |
1254 | spin_lock(&sctx->stat_lock); |
1255 | sctx->stat.corrected_errors++; | |
5a6ac9ea | 1256 | sblock_to_check->data_corrected = 1; |
d9d181c1 | 1257 | spin_unlock(&sctx->stat_lock); |
606686ee | 1258 | printk_ratelimited_in_rcu(KERN_ERR |
efe120a0 | 1259 | "BTRFS: fixed up error at logical %llu on dev %s\n", |
c1c9ff7c | 1260 | logical, rcu_str_deref(dev->name)); |
8628764e | 1261 | } |
b5d67f64 SB |
1262 | } else { |
1263 | did_not_correct_error: | |
d9d181c1 SB |
1264 | spin_lock(&sctx->stat_lock); |
1265 | sctx->stat.uncorrectable_errors++; | |
1266 | spin_unlock(&sctx->stat_lock); | |
606686ee | 1267 | printk_ratelimited_in_rcu(KERN_ERR |
efe120a0 | 1268 | "BTRFS: unable to fixup (regular) error at logical %llu on dev %s\n", |
c1c9ff7c | 1269 | logical, rcu_str_deref(dev->name)); |
96e36920 | 1270 | } |
a2de733c | 1271 | |
b5d67f64 SB |
1272 | out: |
1273 | if (sblocks_for_recheck) { | |
1274 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; | |
1275 | mirror_index++) { | |
1276 | struct scrub_block *sblock = sblocks_for_recheck + | |
1277 | mirror_index; | |
af8e2d1d | 1278 | struct scrub_recover *recover; |
b5d67f64 SB |
1279 | int page_index; |
1280 | ||
7a9e9987 SB |
1281 | for (page_index = 0; page_index < sblock->page_count; |
1282 | page_index++) { | |
1283 | sblock->pagev[page_index]->sblock = NULL; | |
af8e2d1d MX |
1284 | recover = sblock->pagev[page_index]->recover; |
1285 | if (recover) { | |
1286 | scrub_put_recover(recover); | |
1287 | sblock->pagev[page_index]->recover = | |
1288 | NULL; | |
1289 | } | |
7a9e9987 SB |
1290 | scrub_page_put(sblock->pagev[page_index]); |
1291 | } | |
b5d67f64 SB |
1292 | } |
1293 | kfree(sblocks_for_recheck); | |
1294 | } | |
a2de733c | 1295 | |
b5d67f64 SB |
1296 | return 0; |
1297 | } | |
a2de733c | 1298 | |
af8e2d1d MX |
1299 | static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio, u64 *raid_map) |
1300 | { | |
1301 | if (raid_map) { | |
e34c330d ZL |
1302 | int real_stripes = bbio->num_stripes - bbio->num_tgtdevs; |
1303 | ||
1304 | if (raid_map[real_stripes - 1] == RAID6_Q_STRIPE) | |
af8e2d1d MX |
1305 | return 3; |
1306 | else | |
1307 | return 2; | |
1308 | } else { | |
1309 | return (int)bbio->num_stripes; | |
1310 | } | |
1311 | } | |
1312 | ||
1313 | static inline void scrub_stripe_index_and_offset(u64 logical, u64 *raid_map, | |
1314 | u64 mapped_length, | |
1315 | int nstripes, int mirror, | |
1316 | int *stripe_index, | |
1317 | u64 *stripe_offset) | |
1318 | { | |
1319 | int i; | |
1320 | ||
1321 | if (raid_map) { | |
1322 | /* RAID5/6 */ | |
1323 | for (i = 0; i < nstripes; i++) { | |
1324 | if (raid_map[i] == RAID6_Q_STRIPE || | |
1325 | raid_map[i] == RAID5_P_STRIPE) | |
1326 | continue; | |
1327 | ||
1328 | if (logical >= raid_map[i] && | |
1329 | logical < raid_map[i] + mapped_length) | |
1330 | break; | |
1331 | } | |
1332 | ||
1333 | *stripe_index = i; | |
1334 | *stripe_offset = logical - raid_map[i]; | |
1335 | } else { | |
1336 | /* The other RAID type */ | |
1337 | *stripe_index = mirror; | |
1338 | *stripe_offset = 0; | |
1339 | } | |
1340 | } | |
1341 | ||
d9d181c1 | 1342 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
3ec706c8 | 1343 | struct btrfs_fs_info *fs_info, |
ff023aac | 1344 | struct scrub_block *original_sblock, |
b5d67f64 SB |
1345 | u64 length, u64 logical, |
1346 | struct scrub_block *sblocks_for_recheck) | |
1347 | { | |
af8e2d1d MX |
1348 | struct scrub_recover *recover; |
1349 | struct btrfs_bio *bbio; | |
1350 | u64 *raid_map; | |
1351 | u64 sublen; | |
1352 | u64 mapped_length; | |
1353 | u64 stripe_offset; | |
1354 | int stripe_index; | |
b5d67f64 SB |
1355 | int page_index; |
1356 | int mirror_index; | |
af8e2d1d | 1357 | int nmirrors; |
b5d67f64 SB |
1358 | int ret; |
1359 | ||
1360 | /* | |
7a9e9987 | 1361 | * note: the two members ref_count and outstanding_pages |
b5d67f64 SB |
1362 | * are not used (and not set) in the blocks that are used for |
1363 | * the recheck procedure | |
1364 | */ | |
1365 | ||
1366 | page_index = 0; | |
1367 | while (length > 0) { | |
af8e2d1d MX |
1368 | sublen = min_t(u64, length, PAGE_SIZE); |
1369 | mapped_length = sublen; | |
1370 | bbio = NULL; | |
1371 | raid_map = NULL; | |
a2de733c | 1372 | |
b5d67f64 SB |
1373 | /* |
1374 | * with a length of PAGE_SIZE, each returned stripe | |
1375 | * represents one mirror | |
1376 | */ | |
af8e2d1d MX |
1377 | ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical, |
1378 | &mapped_length, &bbio, 0, &raid_map); | |
b5d67f64 SB |
1379 | if (ret || !bbio || mapped_length < sublen) { |
1380 | kfree(bbio); | |
af8e2d1d | 1381 | kfree(raid_map); |
b5d67f64 SB |
1382 | return -EIO; |
1383 | } | |
a2de733c | 1384 | |
af8e2d1d MX |
1385 | recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS); |
1386 | if (!recover) { | |
1387 | kfree(bbio); | |
1388 | kfree(raid_map); | |
1389 | return -ENOMEM; | |
1390 | } | |
1391 | ||
1392 | atomic_set(&recover->refs, 1); | |
1393 | recover->bbio = bbio; | |
1394 | recover->raid_map = raid_map; | |
1395 | recover->map_length = mapped_length; | |
1396 | ||
ff023aac | 1397 | BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO); |
af8e2d1d MX |
1398 | |
1399 | nmirrors = scrub_nr_raid_mirrors(bbio, raid_map); | |
1400 | for (mirror_index = 0; mirror_index < nmirrors; | |
b5d67f64 SB |
1401 | mirror_index++) { |
1402 | struct scrub_block *sblock; | |
1403 | struct scrub_page *page; | |
1404 | ||
1405 | if (mirror_index >= BTRFS_MAX_MIRRORS) | |
1406 | continue; | |
1407 | ||
1408 | sblock = sblocks_for_recheck + mirror_index; | |
7a9e9987 SB |
1409 | sblock->sctx = sctx; |
1410 | page = kzalloc(sizeof(*page), GFP_NOFS); | |
1411 | if (!page) { | |
1412 | leave_nomem: | |
d9d181c1 SB |
1413 | spin_lock(&sctx->stat_lock); |
1414 | sctx->stat.malloc_errors++; | |
1415 | spin_unlock(&sctx->stat_lock); | |
af8e2d1d | 1416 | scrub_put_recover(recover); |
b5d67f64 SB |
1417 | return -ENOMEM; |
1418 | } | |
7a9e9987 SB |
1419 | scrub_page_get(page); |
1420 | sblock->pagev[page_index] = page; | |
1421 | page->logical = logical; | |
af8e2d1d MX |
1422 | |
1423 | scrub_stripe_index_and_offset(logical, raid_map, | |
1424 | mapped_length, | |
e34c330d ZL |
1425 | bbio->num_stripes - |
1426 | bbio->num_tgtdevs, | |
af8e2d1d MX |
1427 | mirror_index, |
1428 | &stripe_index, | |
1429 | &stripe_offset); | |
1430 | page->physical = bbio->stripes[stripe_index].physical + | |
1431 | stripe_offset; | |
1432 | page->dev = bbio->stripes[stripe_index].dev; | |
1433 | ||
ff023aac SB |
1434 | BUG_ON(page_index >= original_sblock->page_count); |
1435 | page->physical_for_dev_replace = | |
1436 | original_sblock->pagev[page_index]-> | |
1437 | physical_for_dev_replace; | |
7a9e9987 | 1438 | /* for missing devices, dev->bdev is NULL */ |
7a9e9987 | 1439 | page->mirror_num = mirror_index + 1; |
b5d67f64 | 1440 | sblock->page_count++; |
7a9e9987 SB |
1441 | page->page = alloc_page(GFP_NOFS); |
1442 | if (!page->page) | |
1443 | goto leave_nomem; | |
af8e2d1d MX |
1444 | |
1445 | scrub_get_recover(recover); | |
1446 | page->recover = recover; | |
b5d67f64 | 1447 | } |
af8e2d1d | 1448 | scrub_put_recover(recover); |
b5d67f64 SB |
1449 | length -= sublen; |
1450 | logical += sublen; | |
1451 | page_index++; | |
1452 | } | |
1453 | ||
1454 | return 0; | |
96e36920 ID |
1455 | } |
1456 | ||
af8e2d1d MX |
1457 | struct scrub_bio_ret { |
1458 | struct completion event; | |
1459 | int error; | |
1460 | }; | |
1461 | ||
1462 | static void scrub_bio_wait_endio(struct bio *bio, int error) | |
1463 | { | |
1464 | struct scrub_bio_ret *ret = bio->bi_private; | |
1465 | ||
1466 | ret->error = error; | |
1467 | complete(&ret->event); | |
1468 | } | |
1469 | ||
1470 | static inline int scrub_is_page_on_raid56(struct scrub_page *page) | |
1471 | { | |
1472 | return page->recover && page->recover->raid_map; | |
1473 | } | |
1474 | ||
1475 | static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info, | |
1476 | struct bio *bio, | |
1477 | struct scrub_page *page) | |
1478 | { | |
1479 | struct scrub_bio_ret done; | |
1480 | int ret; | |
1481 | ||
1482 | init_completion(&done.event); | |
1483 | done.error = 0; | |
1484 | bio->bi_iter.bi_sector = page->logical >> 9; | |
1485 | bio->bi_private = &done; | |
1486 | bio->bi_end_io = scrub_bio_wait_endio; | |
1487 | ||
1488 | ret = raid56_parity_recover(fs_info->fs_root, bio, page->recover->bbio, | |
1489 | page->recover->raid_map, | |
1490 | page->recover->map_length, | |
4245215d | 1491 | page->mirror_num, 0); |
af8e2d1d MX |
1492 | if (ret) |
1493 | return ret; | |
1494 | ||
1495 | wait_for_completion(&done.event); | |
1496 | if (done.error) | |
1497 | return -EIO; | |
1498 | ||
1499 | return 0; | |
1500 | } | |
1501 | ||
b5d67f64 SB |
1502 | /* |
1503 | * this function will check the on disk data for checksum errors, header | |
1504 | * errors and read I/O errors. If any I/O errors happen, the exact pages | |
1505 | * which are errored are marked as being bad. The goal is to enable scrub | |
1506 | * to take those pages that are not errored from all the mirrors so that | |
1507 | * the pages that are errored in the just handled mirror can be repaired. | |
1508 | */ | |
34f5c8e9 SB |
1509 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
1510 | struct scrub_block *sblock, int is_metadata, | |
1511 | int have_csum, u8 *csum, u64 generation, | |
af8e2d1d | 1512 | u16 csum_size, int retry_failed_mirror) |
96e36920 | 1513 | { |
b5d67f64 | 1514 | int page_num; |
96e36920 | 1515 | |
b5d67f64 SB |
1516 | sblock->no_io_error_seen = 1; |
1517 | sblock->header_error = 0; | |
1518 | sblock->checksum_error = 0; | |
96e36920 | 1519 | |
b5d67f64 SB |
1520 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1521 | struct bio *bio; | |
7a9e9987 | 1522 | struct scrub_page *page = sblock->pagev[page_num]; |
b5d67f64 | 1523 | |
442a4f63 | 1524 | if (page->dev->bdev == NULL) { |
ea9947b4 SB |
1525 | page->io_error = 1; |
1526 | sblock->no_io_error_seen = 0; | |
1527 | continue; | |
1528 | } | |
1529 | ||
7a9e9987 | 1530 | WARN_ON(!page->page); |
9be3395b | 1531 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
34f5c8e9 SB |
1532 | if (!bio) { |
1533 | page->io_error = 1; | |
1534 | sblock->no_io_error_seen = 0; | |
1535 | continue; | |
1536 | } | |
442a4f63 | 1537 | bio->bi_bdev = page->dev->bdev; |
b5d67f64 | 1538 | |
34f5c8e9 | 1539 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
af8e2d1d MX |
1540 | if (!retry_failed_mirror && scrub_is_page_on_raid56(page)) { |
1541 | if (scrub_submit_raid56_bio_wait(fs_info, bio, page)) | |
1542 | sblock->no_io_error_seen = 0; | |
1543 | } else { | |
1544 | bio->bi_iter.bi_sector = page->physical >> 9; | |
1545 | ||
1546 | if (btrfsic_submit_bio_wait(READ, bio)) | |
1547 | sblock->no_io_error_seen = 0; | |
1548 | } | |
33879d45 | 1549 | |
b5d67f64 SB |
1550 | bio_put(bio); |
1551 | } | |
96e36920 | 1552 | |
b5d67f64 SB |
1553 | if (sblock->no_io_error_seen) |
1554 | scrub_recheck_block_checksum(fs_info, sblock, is_metadata, | |
1555 | have_csum, csum, generation, | |
1556 | csum_size); | |
1557 | ||
34f5c8e9 | 1558 | return; |
a2de733c AJ |
1559 | } |
1560 | ||
17a9be2f MX |
1561 | static inline int scrub_check_fsid(u8 fsid[], |
1562 | struct scrub_page *spage) | |
1563 | { | |
1564 | struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices; | |
1565 | int ret; | |
1566 | ||
1567 | ret = memcmp(fsid, fs_devices->fsid, BTRFS_UUID_SIZE); | |
1568 | return !ret; | |
1569 | } | |
1570 | ||
b5d67f64 SB |
1571 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
1572 | struct scrub_block *sblock, | |
1573 | int is_metadata, int have_csum, | |
1574 | const u8 *csum, u64 generation, | |
1575 | u16 csum_size) | |
a2de733c | 1576 | { |
b5d67f64 SB |
1577 | int page_num; |
1578 | u8 calculated_csum[BTRFS_CSUM_SIZE]; | |
1579 | u32 crc = ~(u32)0; | |
b5d67f64 SB |
1580 | void *mapped_buffer; |
1581 | ||
7a9e9987 | 1582 | WARN_ON(!sblock->pagev[0]->page); |
b5d67f64 SB |
1583 | if (is_metadata) { |
1584 | struct btrfs_header *h; | |
1585 | ||
7a9e9987 | 1586 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 SB |
1587 | h = (struct btrfs_header *)mapped_buffer; |
1588 | ||
3cae210f | 1589 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h) || |
17a9be2f | 1590 | !scrub_check_fsid(h->fsid, sblock->pagev[0]) || |
b5d67f64 | 1591 | memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, |
442a4f63 | 1592 | BTRFS_UUID_SIZE)) { |
b5d67f64 | 1593 | sblock->header_error = 1; |
3cae210f | 1594 | } else if (generation != btrfs_stack_header_generation(h)) { |
442a4f63 SB |
1595 | sblock->header_error = 1; |
1596 | sblock->generation_error = 1; | |
1597 | } | |
b5d67f64 SB |
1598 | csum = h->csum; |
1599 | } else { | |
1600 | if (!have_csum) | |
1601 | return; | |
a2de733c | 1602 | |
7a9e9987 | 1603 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 | 1604 | } |
a2de733c | 1605 | |
b5d67f64 SB |
1606 | for (page_num = 0;;) { |
1607 | if (page_num == 0 && is_metadata) | |
b0496686 | 1608 | crc = btrfs_csum_data( |
b5d67f64 SB |
1609 | ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE, |
1610 | crc, PAGE_SIZE - BTRFS_CSUM_SIZE); | |
1611 | else | |
b0496686 | 1612 | crc = btrfs_csum_data(mapped_buffer, crc, PAGE_SIZE); |
b5d67f64 | 1613 | |
9613bebb | 1614 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1615 | page_num++; |
1616 | if (page_num >= sblock->page_count) | |
1617 | break; | |
7a9e9987 | 1618 | WARN_ON(!sblock->pagev[page_num]->page); |
b5d67f64 | 1619 | |
7a9e9987 | 1620 | mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page); |
b5d67f64 SB |
1621 | } |
1622 | ||
1623 | btrfs_csum_final(crc, calculated_csum); | |
1624 | if (memcmp(calculated_csum, csum, csum_size)) | |
1625 | sblock->checksum_error = 1; | |
a2de733c AJ |
1626 | } |
1627 | ||
b5d67f64 SB |
1628 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
1629 | struct scrub_block *sblock_good, | |
1630 | int force_write) | |
1631 | { | |
1632 | int page_num; | |
1633 | int ret = 0; | |
96e36920 | 1634 | |
b5d67f64 SB |
1635 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
1636 | int ret_sub; | |
96e36920 | 1637 | |
b5d67f64 SB |
1638 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
1639 | sblock_good, | |
1640 | page_num, | |
1641 | force_write); | |
1642 | if (ret_sub) | |
1643 | ret = ret_sub; | |
a2de733c | 1644 | } |
b5d67f64 SB |
1645 | |
1646 | return ret; | |
1647 | } | |
1648 | ||
1649 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
1650 | struct scrub_block *sblock_good, | |
1651 | int page_num, int force_write) | |
1652 | { | |
7a9e9987 SB |
1653 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
1654 | struct scrub_page *page_good = sblock_good->pagev[page_num]; | |
b5d67f64 | 1655 | |
7a9e9987 SB |
1656 | BUG_ON(page_bad->page == NULL); |
1657 | BUG_ON(page_good->page == NULL); | |
b5d67f64 SB |
1658 | if (force_write || sblock_bad->header_error || |
1659 | sblock_bad->checksum_error || page_bad->io_error) { | |
1660 | struct bio *bio; | |
1661 | int ret; | |
b5d67f64 | 1662 | |
ff023aac | 1663 | if (!page_bad->dev->bdev) { |
efe120a0 FH |
1664 | printk_ratelimited(KERN_WARNING "BTRFS: " |
1665 | "scrub_repair_page_from_good_copy(bdev == NULL) " | |
1666 | "is unexpected!\n"); | |
ff023aac SB |
1667 | return -EIO; |
1668 | } | |
1669 | ||
9be3395b | 1670 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
e627ee7b TI |
1671 | if (!bio) |
1672 | return -EIO; | |
442a4f63 | 1673 | bio->bi_bdev = page_bad->dev->bdev; |
4f024f37 | 1674 | bio->bi_iter.bi_sector = page_bad->physical >> 9; |
b5d67f64 SB |
1675 | |
1676 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); | |
1677 | if (PAGE_SIZE != ret) { | |
1678 | bio_put(bio); | |
1679 | return -EIO; | |
13db62b7 | 1680 | } |
b5d67f64 | 1681 | |
33879d45 | 1682 | if (btrfsic_submit_bio_wait(WRITE, bio)) { |
442a4f63 SB |
1683 | btrfs_dev_stat_inc_and_print(page_bad->dev, |
1684 | BTRFS_DEV_STAT_WRITE_ERRS); | |
ff023aac SB |
1685 | btrfs_dev_replace_stats_inc( |
1686 | &sblock_bad->sctx->dev_root->fs_info-> | |
1687 | dev_replace.num_write_errors); | |
442a4f63 SB |
1688 | bio_put(bio); |
1689 | return -EIO; | |
1690 | } | |
b5d67f64 | 1691 | bio_put(bio); |
a2de733c AJ |
1692 | } |
1693 | ||
b5d67f64 SB |
1694 | return 0; |
1695 | } | |
1696 | ||
ff023aac SB |
1697 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
1698 | { | |
1699 | int page_num; | |
1700 | ||
5a6ac9ea MX |
1701 | /* |
1702 | * This block is used for the check of the parity on the source device, | |
1703 | * so the data needn't be written into the destination device. | |
1704 | */ | |
1705 | if (sblock->sparity) | |
1706 | return; | |
1707 | ||
ff023aac SB |
1708 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1709 | int ret; | |
1710 | ||
1711 | ret = scrub_write_page_to_dev_replace(sblock, page_num); | |
1712 | if (ret) | |
1713 | btrfs_dev_replace_stats_inc( | |
1714 | &sblock->sctx->dev_root->fs_info->dev_replace. | |
1715 | num_write_errors); | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
1720 | int page_num) | |
1721 | { | |
1722 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1723 | ||
1724 | BUG_ON(spage->page == NULL); | |
1725 | if (spage->io_error) { | |
1726 | void *mapped_buffer = kmap_atomic(spage->page); | |
1727 | ||
1728 | memset(mapped_buffer, 0, PAGE_CACHE_SIZE); | |
1729 | flush_dcache_page(spage->page); | |
1730 | kunmap_atomic(mapped_buffer); | |
1731 | } | |
1732 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); | |
1733 | } | |
1734 | ||
1735 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
1736 | struct scrub_page *spage) | |
1737 | { | |
1738 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1739 | struct scrub_bio *sbio; | |
1740 | int ret; | |
1741 | ||
1742 | mutex_lock(&wr_ctx->wr_lock); | |
1743 | again: | |
1744 | if (!wr_ctx->wr_curr_bio) { | |
1745 | wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio), | |
1746 | GFP_NOFS); | |
1747 | if (!wr_ctx->wr_curr_bio) { | |
1748 | mutex_unlock(&wr_ctx->wr_lock); | |
1749 | return -ENOMEM; | |
1750 | } | |
1751 | wr_ctx->wr_curr_bio->sctx = sctx; | |
1752 | wr_ctx->wr_curr_bio->page_count = 0; | |
1753 | } | |
1754 | sbio = wr_ctx->wr_curr_bio; | |
1755 | if (sbio->page_count == 0) { | |
1756 | struct bio *bio; | |
1757 | ||
1758 | sbio->physical = spage->physical_for_dev_replace; | |
1759 | sbio->logical = spage->logical; | |
1760 | sbio->dev = wr_ctx->tgtdev; | |
1761 | bio = sbio->bio; | |
1762 | if (!bio) { | |
9be3395b | 1763 | bio = btrfs_io_bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio); |
ff023aac SB |
1764 | if (!bio) { |
1765 | mutex_unlock(&wr_ctx->wr_lock); | |
1766 | return -ENOMEM; | |
1767 | } | |
1768 | sbio->bio = bio; | |
1769 | } | |
1770 | ||
1771 | bio->bi_private = sbio; | |
1772 | bio->bi_end_io = scrub_wr_bio_end_io; | |
1773 | bio->bi_bdev = sbio->dev->bdev; | |
4f024f37 | 1774 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
ff023aac SB |
1775 | sbio->err = 0; |
1776 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != | |
1777 | spage->physical_for_dev_replace || | |
1778 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
1779 | spage->logical) { | |
1780 | scrub_wr_submit(sctx); | |
1781 | goto again; | |
1782 | } | |
1783 | ||
1784 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1785 | if (ret != PAGE_SIZE) { | |
1786 | if (sbio->page_count < 1) { | |
1787 | bio_put(sbio->bio); | |
1788 | sbio->bio = NULL; | |
1789 | mutex_unlock(&wr_ctx->wr_lock); | |
1790 | return -EIO; | |
1791 | } | |
1792 | scrub_wr_submit(sctx); | |
1793 | goto again; | |
1794 | } | |
1795 | ||
1796 | sbio->pagev[sbio->page_count] = spage; | |
1797 | scrub_page_get(spage); | |
1798 | sbio->page_count++; | |
1799 | if (sbio->page_count == wr_ctx->pages_per_wr_bio) | |
1800 | scrub_wr_submit(sctx); | |
1801 | mutex_unlock(&wr_ctx->wr_lock); | |
1802 | ||
1803 | return 0; | |
1804 | } | |
1805 | ||
1806 | static void scrub_wr_submit(struct scrub_ctx *sctx) | |
1807 | { | |
1808 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1809 | struct scrub_bio *sbio; | |
1810 | ||
1811 | if (!wr_ctx->wr_curr_bio) | |
1812 | return; | |
1813 | ||
1814 | sbio = wr_ctx->wr_curr_bio; | |
1815 | wr_ctx->wr_curr_bio = NULL; | |
1816 | WARN_ON(!sbio->bio->bi_bdev); | |
1817 | scrub_pending_bio_inc(sctx); | |
1818 | /* process all writes in a single worker thread. Then the block layer | |
1819 | * orders the requests before sending them to the driver which | |
1820 | * doubled the write performance on spinning disks when measured | |
1821 | * with Linux 3.5 */ | |
1822 | btrfsic_submit_bio(WRITE, sbio->bio); | |
1823 | } | |
1824 | ||
1825 | static void scrub_wr_bio_end_io(struct bio *bio, int err) | |
1826 | { | |
1827 | struct scrub_bio *sbio = bio->bi_private; | |
1828 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; | |
1829 | ||
1830 | sbio->err = err; | |
1831 | sbio->bio = bio; | |
1832 | ||
9e0af237 LB |
1833 | btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper, |
1834 | scrub_wr_bio_end_io_worker, NULL, NULL); | |
0339ef2f | 1835 | btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work); |
ff023aac SB |
1836 | } |
1837 | ||
1838 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) | |
1839 | { | |
1840 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
1841 | struct scrub_ctx *sctx = sbio->sctx; | |
1842 | int i; | |
1843 | ||
1844 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); | |
1845 | if (sbio->err) { | |
1846 | struct btrfs_dev_replace *dev_replace = | |
1847 | &sbio->sctx->dev_root->fs_info->dev_replace; | |
1848 | ||
1849 | for (i = 0; i < sbio->page_count; i++) { | |
1850 | struct scrub_page *spage = sbio->pagev[i]; | |
1851 | ||
1852 | spage->io_error = 1; | |
1853 | btrfs_dev_replace_stats_inc(&dev_replace-> | |
1854 | num_write_errors); | |
1855 | } | |
1856 | } | |
1857 | ||
1858 | for (i = 0; i < sbio->page_count; i++) | |
1859 | scrub_page_put(sbio->pagev[i]); | |
1860 | ||
1861 | bio_put(sbio->bio); | |
1862 | kfree(sbio); | |
1863 | scrub_pending_bio_dec(sctx); | |
1864 | } | |
1865 | ||
1866 | static int scrub_checksum(struct scrub_block *sblock) | |
b5d67f64 SB |
1867 | { |
1868 | u64 flags; | |
1869 | int ret; | |
1870 | ||
7a9e9987 SB |
1871 | WARN_ON(sblock->page_count < 1); |
1872 | flags = sblock->pagev[0]->flags; | |
b5d67f64 SB |
1873 | ret = 0; |
1874 | if (flags & BTRFS_EXTENT_FLAG_DATA) | |
1875 | ret = scrub_checksum_data(sblock); | |
1876 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) | |
1877 | ret = scrub_checksum_tree_block(sblock); | |
1878 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
1879 | (void)scrub_checksum_super(sblock); | |
1880 | else | |
1881 | WARN_ON(1); | |
1882 | if (ret) | |
1883 | scrub_handle_errored_block(sblock); | |
ff023aac SB |
1884 | |
1885 | return ret; | |
a2de733c AJ |
1886 | } |
1887 | ||
b5d67f64 | 1888 | static int scrub_checksum_data(struct scrub_block *sblock) |
a2de733c | 1889 | { |
d9d181c1 | 1890 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1891 | u8 csum[BTRFS_CSUM_SIZE]; |
b5d67f64 SB |
1892 | u8 *on_disk_csum; |
1893 | struct page *page; | |
1894 | void *buffer; | |
a2de733c AJ |
1895 | u32 crc = ~(u32)0; |
1896 | int fail = 0; | |
b5d67f64 SB |
1897 | u64 len; |
1898 | int index; | |
a2de733c | 1899 | |
b5d67f64 | 1900 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1901 | if (!sblock->pagev[0]->have_csum) |
a2de733c AJ |
1902 | return 0; |
1903 | ||
7a9e9987 SB |
1904 | on_disk_csum = sblock->pagev[0]->csum; |
1905 | page = sblock->pagev[0]->page; | |
9613bebb | 1906 | buffer = kmap_atomic(page); |
b5d67f64 | 1907 | |
d9d181c1 | 1908 | len = sctx->sectorsize; |
b5d67f64 SB |
1909 | index = 0; |
1910 | for (;;) { | |
1911 | u64 l = min_t(u64, len, PAGE_SIZE); | |
1912 | ||
b0496686 | 1913 | crc = btrfs_csum_data(buffer, crc, l); |
9613bebb | 1914 | kunmap_atomic(buffer); |
b5d67f64 SB |
1915 | len -= l; |
1916 | if (len == 0) | |
1917 | break; | |
1918 | index++; | |
1919 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1920 | BUG_ON(!sblock->pagev[index]->page); |
1921 | page = sblock->pagev[index]->page; | |
9613bebb | 1922 | buffer = kmap_atomic(page); |
b5d67f64 SB |
1923 | } |
1924 | ||
a2de733c | 1925 | btrfs_csum_final(crc, csum); |
d9d181c1 | 1926 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1927 | fail = 1; |
1928 | ||
a2de733c AJ |
1929 | return fail; |
1930 | } | |
1931 | ||
b5d67f64 | 1932 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
a2de733c | 1933 | { |
d9d181c1 | 1934 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1935 | struct btrfs_header *h; |
a36cf8b8 | 1936 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 1937 | struct btrfs_fs_info *fs_info = root->fs_info; |
b5d67f64 SB |
1938 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1939 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1940 | struct page *page; | |
1941 | void *mapped_buffer; | |
1942 | u64 mapped_size; | |
1943 | void *p; | |
a2de733c AJ |
1944 | u32 crc = ~(u32)0; |
1945 | int fail = 0; | |
1946 | int crc_fail = 0; | |
b5d67f64 SB |
1947 | u64 len; |
1948 | int index; | |
1949 | ||
1950 | BUG_ON(sblock->page_count < 1); | |
7a9e9987 | 1951 | page = sblock->pagev[0]->page; |
9613bebb | 1952 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1953 | h = (struct btrfs_header *)mapped_buffer; |
d9d181c1 | 1954 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
a2de733c AJ |
1955 | |
1956 | /* | |
1957 | * we don't use the getter functions here, as we | |
1958 | * a) don't have an extent buffer and | |
1959 | * b) the page is already kmapped | |
1960 | */ | |
a2de733c | 1961 | |
3cae210f | 1962 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h)) |
a2de733c AJ |
1963 | ++fail; |
1964 | ||
3cae210f | 1965 | if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h)) |
a2de733c AJ |
1966 | ++fail; |
1967 | ||
17a9be2f | 1968 | if (!scrub_check_fsid(h->fsid, sblock->pagev[0])) |
a2de733c AJ |
1969 | ++fail; |
1970 | ||
1971 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
1972 | BTRFS_UUID_SIZE)) | |
1973 | ++fail; | |
1974 | ||
d9d181c1 | 1975 | len = sctx->nodesize - BTRFS_CSUM_SIZE; |
b5d67f64 SB |
1976 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
1977 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1978 | index = 0; | |
1979 | for (;;) { | |
1980 | u64 l = min_t(u64, len, mapped_size); | |
1981 | ||
b0496686 | 1982 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 1983 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1984 | len -= l; |
1985 | if (len == 0) | |
1986 | break; | |
1987 | index++; | |
1988 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1989 | BUG_ON(!sblock->pagev[index]->page); |
1990 | page = sblock->pagev[index]->page; | |
9613bebb | 1991 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1992 | mapped_size = PAGE_SIZE; |
1993 | p = mapped_buffer; | |
1994 | } | |
1995 | ||
1996 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1997 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1998 | ++crc_fail; |
1999 | ||
a2de733c AJ |
2000 | return fail || crc_fail; |
2001 | } | |
2002 | ||
b5d67f64 | 2003 | static int scrub_checksum_super(struct scrub_block *sblock) |
a2de733c AJ |
2004 | { |
2005 | struct btrfs_super_block *s; | |
d9d181c1 | 2006 | struct scrub_ctx *sctx = sblock->sctx; |
b5d67f64 SB |
2007 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
2008 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
2009 | struct page *page; | |
2010 | void *mapped_buffer; | |
2011 | u64 mapped_size; | |
2012 | void *p; | |
a2de733c | 2013 | u32 crc = ~(u32)0; |
442a4f63 SB |
2014 | int fail_gen = 0; |
2015 | int fail_cor = 0; | |
b5d67f64 SB |
2016 | u64 len; |
2017 | int index; | |
a2de733c | 2018 | |
b5d67f64 | 2019 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 2020 | page = sblock->pagev[0]->page; |
9613bebb | 2021 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 2022 | s = (struct btrfs_super_block *)mapped_buffer; |
d9d181c1 | 2023 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
a2de733c | 2024 | |
3cae210f | 2025 | if (sblock->pagev[0]->logical != btrfs_super_bytenr(s)) |
442a4f63 | 2026 | ++fail_cor; |
a2de733c | 2027 | |
3cae210f | 2028 | if (sblock->pagev[0]->generation != btrfs_super_generation(s)) |
442a4f63 | 2029 | ++fail_gen; |
a2de733c | 2030 | |
17a9be2f | 2031 | if (!scrub_check_fsid(s->fsid, sblock->pagev[0])) |
442a4f63 | 2032 | ++fail_cor; |
a2de733c | 2033 | |
b5d67f64 SB |
2034 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
2035 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; | |
2036 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
2037 | index = 0; | |
2038 | for (;;) { | |
2039 | u64 l = min_t(u64, len, mapped_size); | |
2040 | ||
b0496686 | 2041 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 2042 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
2043 | len -= l; |
2044 | if (len == 0) | |
2045 | break; | |
2046 | index++; | |
2047 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
2048 | BUG_ON(!sblock->pagev[index]->page); |
2049 | page = sblock->pagev[index]->page; | |
9613bebb | 2050 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
2051 | mapped_size = PAGE_SIZE; |
2052 | p = mapped_buffer; | |
2053 | } | |
2054 | ||
2055 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 2056 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
442a4f63 | 2057 | ++fail_cor; |
a2de733c | 2058 | |
442a4f63 | 2059 | if (fail_cor + fail_gen) { |
a2de733c AJ |
2060 | /* |
2061 | * if we find an error in a super block, we just report it. | |
2062 | * They will get written with the next transaction commit | |
2063 | * anyway | |
2064 | */ | |
d9d181c1 SB |
2065 | spin_lock(&sctx->stat_lock); |
2066 | ++sctx->stat.super_errors; | |
2067 | spin_unlock(&sctx->stat_lock); | |
442a4f63 | 2068 | if (fail_cor) |
7a9e9987 | 2069 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 SB |
2070 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
2071 | else | |
7a9e9987 | 2072 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 | 2073 | BTRFS_DEV_STAT_GENERATION_ERRS); |
a2de733c AJ |
2074 | } |
2075 | ||
442a4f63 | 2076 | return fail_cor + fail_gen; |
a2de733c AJ |
2077 | } |
2078 | ||
b5d67f64 SB |
2079 | static void scrub_block_get(struct scrub_block *sblock) |
2080 | { | |
2081 | atomic_inc(&sblock->ref_count); | |
2082 | } | |
2083 | ||
2084 | static void scrub_block_put(struct scrub_block *sblock) | |
2085 | { | |
2086 | if (atomic_dec_and_test(&sblock->ref_count)) { | |
2087 | int i; | |
2088 | ||
5a6ac9ea MX |
2089 | if (sblock->sparity) |
2090 | scrub_parity_put(sblock->sparity); | |
2091 | ||
b5d67f64 | 2092 | for (i = 0; i < sblock->page_count; i++) |
7a9e9987 | 2093 | scrub_page_put(sblock->pagev[i]); |
b5d67f64 SB |
2094 | kfree(sblock); |
2095 | } | |
2096 | } | |
2097 | ||
7a9e9987 SB |
2098 | static void scrub_page_get(struct scrub_page *spage) |
2099 | { | |
2100 | atomic_inc(&spage->ref_count); | |
2101 | } | |
2102 | ||
2103 | static void scrub_page_put(struct scrub_page *spage) | |
2104 | { | |
2105 | if (atomic_dec_and_test(&spage->ref_count)) { | |
2106 | if (spage->page) | |
2107 | __free_page(spage->page); | |
2108 | kfree(spage); | |
2109 | } | |
2110 | } | |
2111 | ||
d9d181c1 | 2112 | static void scrub_submit(struct scrub_ctx *sctx) |
a2de733c AJ |
2113 | { |
2114 | struct scrub_bio *sbio; | |
2115 | ||
d9d181c1 | 2116 | if (sctx->curr == -1) |
1623edeb | 2117 | return; |
a2de733c | 2118 | |
d9d181c1 SB |
2119 | sbio = sctx->bios[sctx->curr]; |
2120 | sctx->curr = -1; | |
b6bfebc1 | 2121 | scrub_pending_bio_inc(sctx); |
a2de733c | 2122 | |
ff023aac SB |
2123 | if (!sbio->bio->bi_bdev) { |
2124 | /* | |
2125 | * this case should not happen. If btrfs_map_block() is | |
2126 | * wrong, it could happen for dev-replace operations on | |
2127 | * missing devices when no mirrors are available, but in | |
2128 | * this case it should already fail the mount. | |
2129 | * This case is handled correctly (but _very_ slowly). | |
2130 | */ | |
2131 | printk_ratelimited(KERN_WARNING | |
efe120a0 | 2132 | "BTRFS: scrub_submit(bio bdev == NULL) is unexpected!\n"); |
ff023aac SB |
2133 | bio_endio(sbio->bio, -EIO); |
2134 | } else { | |
2135 | btrfsic_submit_bio(READ, sbio->bio); | |
2136 | } | |
a2de733c AJ |
2137 | } |
2138 | ||
ff023aac SB |
2139 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
2140 | struct scrub_page *spage) | |
a2de733c | 2141 | { |
b5d67f64 | 2142 | struct scrub_block *sblock = spage->sblock; |
a2de733c | 2143 | struct scrub_bio *sbio; |
69f4cb52 | 2144 | int ret; |
a2de733c AJ |
2145 | |
2146 | again: | |
2147 | /* | |
2148 | * grab a fresh bio or wait for one to become available | |
2149 | */ | |
d9d181c1 SB |
2150 | while (sctx->curr == -1) { |
2151 | spin_lock(&sctx->list_lock); | |
2152 | sctx->curr = sctx->first_free; | |
2153 | if (sctx->curr != -1) { | |
2154 | sctx->first_free = sctx->bios[sctx->curr]->next_free; | |
2155 | sctx->bios[sctx->curr]->next_free = -1; | |
2156 | sctx->bios[sctx->curr]->page_count = 0; | |
2157 | spin_unlock(&sctx->list_lock); | |
a2de733c | 2158 | } else { |
d9d181c1 SB |
2159 | spin_unlock(&sctx->list_lock); |
2160 | wait_event(sctx->list_wait, sctx->first_free != -1); | |
a2de733c AJ |
2161 | } |
2162 | } | |
d9d181c1 | 2163 | sbio = sctx->bios[sctx->curr]; |
b5d67f64 | 2164 | if (sbio->page_count == 0) { |
69f4cb52 AJ |
2165 | struct bio *bio; |
2166 | ||
b5d67f64 SB |
2167 | sbio->physical = spage->physical; |
2168 | sbio->logical = spage->logical; | |
a36cf8b8 | 2169 | sbio->dev = spage->dev; |
b5d67f64 SB |
2170 | bio = sbio->bio; |
2171 | if (!bio) { | |
9be3395b | 2172 | bio = btrfs_io_bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio); |
b5d67f64 SB |
2173 | if (!bio) |
2174 | return -ENOMEM; | |
2175 | sbio->bio = bio; | |
2176 | } | |
69f4cb52 AJ |
2177 | |
2178 | bio->bi_private = sbio; | |
2179 | bio->bi_end_io = scrub_bio_end_io; | |
a36cf8b8 | 2180 | bio->bi_bdev = sbio->dev->bdev; |
4f024f37 | 2181 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
69f4cb52 | 2182 | sbio->err = 0; |
b5d67f64 SB |
2183 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
2184 | spage->physical || | |
2185 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
a36cf8b8 SB |
2186 | spage->logical || |
2187 | sbio->dev != spage->dev) { | |
d9d181c1 | 2188 | scrub_submit(sctx); |
a2de733c AJ |
2189 | goto again; |
2190 | } | |
69f4cb52 | 2191 | |
b5d67f64 SB |
2192 | sbio->pagev[sbio->page_count] = spage; |
2193 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
2194 | if (ret != PAGE_SIZE) { | |
2195 | if (sbio->page_count < 1) { | |
2196 | bio_put(sbio->bio); | |
2197 | sbio->bio = NULL; | |
2198 | return -EIO; | |
2199 | } | |
d9d181c1 | 2200 | scrub_submit(sctx); |
69f4cb52 AJ |
2201 | goto again; |
2202 | } | |
2203 | ||
ff023aac | 2204 | scrub_block_get(sblock); /* one for the page added to the bio */ |
b5d67f64 SB |
2205 | atomic_inc(&sblock->outstanding_pages); |
2206 | sbio->page_count++; | |
ff023aac | 2207 | if (sbio->page_count == sctx->pages_per_rd_bio) |
d9d181c1 | 2208 | scrub_submit(sctx); |
b5d67f64 SB |
2209 | |
2210 | return 0; | |
2211 | } | |
2212 | ||
d9d181c1 | 2213 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2214 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
2215 | u64 gen, int mirror_num, u8 *csum, int force, |
2216 | u64 physical_for_dev_replace) | |
b5d67f64 SB |
2217 | { |
2218 | struct scrub_block *sblock; | |
2219 | int index; | |
2220 | ||
2221 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
2222 | if (!sblock) { | |
d9d181c1 SB |
2223 | spin_lock(&sctx->stat_lock); |
2224 | sctx->stat.malloc_errors++; | |
2225 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2226 | return -ENOMEM; |
a2de733c | 2227 | } |
b5d67f64 | 2228 | |
7a9e9987 SB |
2229 | /* one ref inside this function, plus one for each page added to |
2230 | * a bio later on */ | |
b5d67f64 | 2231 | atomic_set(&sblock->ref_count, 1); |
d9d181c1 | 2232 | sblock->sctx = sctx; |
b5d67f64 SB |
2233 | sblock->no_io_error_seen = 1; |
2234 | ||
2235 | for (index = 0; len > 0; index++) { | |
7a9e9987 | 2236 | struct scrub_page *spage; |
b5d67f64 SB |
2237 | u64 l = min_t(u64, len, PAGE_SIZE); |
2238 | ||
7a9e9987 SB |
2239 | spage = kzalloc(sizeof(*spage), GFP_NOFS); |
2240 | if (!spage) { | |
2241 | leave_nomem: | |
d9d181c1 SB |
2242 | spin_lock(&sctx->stat_lock); |
2243 | sctx->stat.malloc_errors++; | |
2244 | spin_unlock(&sctx->stat_lock); | |
7a9e9987 | 2245 | scrub_block_put(sblock); |
b5d67f64 SB |
2246 | return -ENOMEM; |
2247 | } | |
7a9e9987 SB |
2248 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
2249 | scrub_page_get(spage); | |
2250 | sblock->pagev[index] = spage; | |
b5d67f64 | 2251 | spage->sblock = sblock; |
a36cf8b8 | 2252 | spage->dev = dev; |
b5d67f64 SB |
2253 | spage->flags = flags; |
2254 | spage->generation = gen; | |
2255 | spage->logical = logical; | |
2256 | spage->physical = physical; | |
ff023aac | 2257 | spage->physical_for_dev_replace = physical_for_dev_replace; |
b5d67f64 SB |
2258 | spage->mirror_num = mirror_num; |
2259 | if (csum) { | |
2260 | spage->have_csum = 1; | |
d9d181c1 | 2261 | memcpy(spage->csum, csum, sctx->csum_size); |
b5d67f64 SB |
2262 | } else { |
2263 | spage->have_csum = 0; | |
2264 | } | |
2265 | sblock->page_count++; | |
7a9e9987 SB |
2266 | spage->page = alloc_page(GFP_NOFS); |
2267 | if (!spage->page) | |
2268 | goto leave_nomem; | |
b5d67f64 SB |
2269 | len -= l; |
2270 | logical += l; | |
2271 | physical += l; | |
ff023aac | 2272 | physical_for_dev_replace += l; |
b5d67f64 SB |
2273 | } |
2274 | ||
7a9e9987 | 2275 | WARN_ON(sblock->page_count == 0); |
b5d67f64 | 2276 | for (index = 0; index < sblock->page_count; index++) { |
7a9e9987 | 2277 | struct scrub_page *spage = sblock->pagev[index]; |
1bc87793 AJ |
2278 | int ret; |
2279 | ||
ff023aac | 2280 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
b5d67f64 SB |
2281 | if (ret) { |
2282 | scrub_block_put(sblock); | |
1bc87793 | 2283 | return ret; |
b5d67f64 | 2284 | } |
1bc87793 | 2285 | } |
a2de733c | 2286 | |
b5d67f64 | 2287 | if (force) |
d9d181c1 | 2288 | scrub_submit(sctx); |
a2de733c | 2289 | |
b5d67f64 SB |
2290 | /* last one frees, either here or in bio completion for last page */ |
2291 | scrub_block_put(sblock); | |
a2de733c AJ |
2292 | return 0; |
2293 | } | |
2294 | ||
b5d67f64 SB |
2295 | static void scrub_bio_end_io(struct bio *bio, int err) |
2296 | { | |
2297 | struct scrub_bio *sbio = bio->bi_private; | |
a36cf8b8 | 2298 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
b5d67f64 SB |
2299 | |
2300 | sbio->err = err; | |
2301 | sbio->bio = bio; | |
2302 | ||
0339ef2f | 2303 | btrfs_queue_work(fs_info->scrub_workers, &sbio->work); |
b5d67f64 SB |
2304 | } |
2305 | ||
2306 | static void scrub_bio_end_io_worker(struct btrfs_work *work) | |
2307 | { | |
2308 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
d9d181c1 | 2309 | struct scrub_ctx *sctx = sbio->sctx; |
b5d67f64 SB |
2310 | int i; |
2311 | ||
ff023aac | 2312 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
2313 | if (sbio->err) { |
2314 | for (i = 0; i < sbio->page_count; i++) { | |
2315 | struct scrub_page *spage = sbio->pagev[i]; | |
2316 | ||
2317 | spage->io_error = 1; | |
2318 | spage->sblock->no_io_error_seen = 0; | |
2319 | } | |
2320 | } | |
2321 | ||
2322 | /* now complete the scrub_block items that have all pages completed */ | |
2323 | for (i = 0; i < sbio->page_count; i++) { | |
2324 | struct scrub_page *spage = sbio->pagev[i]; | |
2325 | struct scrub_block *sblock = spage->sblock; | |
2326 | ||
2327 | if (atomic_dec_and_test(&sblock->outstanding_pages)) | |
2328 | scrub_block_complete(sblock); | |
2329 | scrub_block_put(sblock); | |
2330 | } | |
2331 | ||
b5d67f64 SB |
2332 | bio_put(sbio->bio); |
2333 | sbio->bio = NULL; | |
d9d181c1 SB |
2334 | spin_lock(&sctx->list_lock); |
2335 | sbio->next_free = sctx->first_free; | |
2336 | sctx->first_free = sbio->index; | |
2337 | spin_unlock(&sctx->list_lock); | |
ff023aac SB |
2338 | |
2339 | if (sctx->is_dev_replace && | |
2340 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { | |
2341 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2342 | scrub_wr_submit(sctx); | |
2343 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2344 | } | |
2345 | ||
b6bfebc1 | 2346 | scrub_pending_bio_dec(sctx); |
b5d67f64 SB |
2347 | } |
2348 | ||
5a6ac9ea MX |
2349 | static inline void __scrub_mark_bitmap(struct scrub_parity *sparity, |
2350 | unsigned long *bitmap, | |
2351 | u64 start, u64 len) | |
2352 | { | |
2353 | int offset; | |
2354 | int nsectors; | |
2355 | int sectorsize = sparity->sctx->dev_root->sectorsize; | |
2356 | ||
2357 | if (len >= sparity->stripe_len) { | |
2358 | bitmap_set(bitmap, 0, sparity->nsectors); | |
2359 | return; | |
2360 | } | |
2361 | ||
2362 | start -= sparity->logic_start; | |
2363 | offset = (int)do_div(start, sparity->stripe_len); | |
2364 | offset /= sectorsize; | |
2365 | nsectors = (int)len / sectorsize; | |
2366 | ||
2367 | if (offset + nsectors <= sparity->nsectors) { | |
2368 | bitmap_set(bitmap, offset, nsectors); | |
2369 | return; | |
2370 | } | |
2371 | ||
2372 | bitmap_set(bitmap, offset, sparity->nsectors - offset); | |
2373 | bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset)); | |
2374 | } | |
2375 | ||
2376 | static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity, | |
2377 | u64 start, u64 len) | |
2378 | { | |
2379 | __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len); | |
2380 | } | |
2381 | ||
2382 | static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity, | |
2383 | u64 start, u64 len) | |
2384 | { | |
2385 | __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len); | |
2386 | } | |
2387 | ||
b5d67f64 SB |
2388 | static void scrub_block_complete(struct scrub_block *sblock) |
2389 | { | |
5a6ac9ea MX |
2390 | int corrupted = 0; |
2391 | ||
ff023aac | 2392 | if (!sblock->no_io_error_seen) { |
5a6ac9ea | 2393 | corrupted = 1; |
b5d67f64 | 2394 | scrub_handle_errored_block(sblock); |
ff023aac SB |
2395 | } else { |
2396 | /* | |
2397 | * if has checksum error, write via repair mechanism in | |
2398 | * dev replace case, otherwise write here in dev replace | |
2399 | * case. | |
2400 | */ | |
5a6ac9ea MX |
2401 | corrupted = scrub_checksum(sblock); |
2402 | if (!corrupted && sblock->sctx->is_dev_replace) | |
ff023aac SB |
2403 | scrub_write_block_to_dev_replace(sblock); |
2404 | } | |
5a6ac9ea MX |
2405 | |
2406 | if (sblock->sparity && corrupted && !sblock->data_corrected) { | |
2407 | u64 start = sblock->pagev[0]->logical; | |
2408 | u64 end = sblock->pagev[sblock->page_count - 1]->logical + | |
2409 | PAGE_SIZE; | |
2410 | ||
2411 | scrub_parity_mark_sectors_error(sblock->sparity, | |
2412 | start, end - start); | |
2413 | } | |
b5d67f64 SB |
2414 | } |
2415 | ||
d9d181c1 | 2416 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len, |
a2de733c AJ |
2417 | u8 *csum) |
2418 | { | |
2419 | struct btrfs_ordered_sum *sum = NULL; | |
f51a4a18 | 2420 | unsigned long index; |
a2de733c | 2421 | unsigned long num_sectors; |
a2de733c | 2422 | |
d9d181c1 SB |
2423 | while (!list_empty(&sctx->csum_list)) { |
2424 | sum = list_first_entry(&sctx->csum_list, | |
a2de733c AJ |
2425 | struct btrfs_ordered_sum, list); |
2426 | if (sum->bytenr > logical) | |
2427 | return 0; | |
2428 | if (sum->bytenr + sum->len > logical) | |
2429 | break; | |
2430 | ||
d9d181c1 | 2431 | ++sctx->stat.csum_discards; |
a2de733c AJ |
2432 | list_del(&sum->list); |
2433 | kfree(sum); | |
2434 | sum = NULL; | |
2435 | } | |
2436 | if (!sum) | |
2437 | return 0; | |
2438 | ||
f51a4a18 | 2439 | index = ((u32)(logical - sum->bytenr)) / sctx->sectorsize; |
d9d181c1 | 2440 | num_sectors = sum->len / sctx->sectorsize; |
f51a4a18 MX |
2441 | memcpy(csum, sum->sums + index, sctx->csum_size); |
2442 | if (index == num_sectors - 1) { | |
a2de733c AJ |
2443 | list_del(&sum->list); |
2444 | kfree(sum); | |
2445 | } | |
f51a4a18 | 2446 | return 1; |
a2de733c AJ |
2447 | } |
2448 | ||
2449 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
d9d181c1 | 2450 | static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2451 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac | 2452 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
a2de733c AJ |
2453 | { |
2454 | int ret; | |
2455 | u8 csum[BTRFS_CSUM_SIZE]; | |
b5d67f64 SB |
2456 | u32 blocksize; |
2457 | ||
2458 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
d9d181c1 SB |
2459 | blocksize = sctx->sectorsize; |
2460 | spin_lock(&sctx->stat_lock); | |
2461 | sctx->stat.data_extents_scrubbed++; | |
2462 | sctx->stat.data_bytes_scrubbed += len; | |
2463 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2464 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
d9d181c1 SB |
2465 | blocksize = sctx->nodesize; |
2466 | spin_lock(&sctx->stat_lock); | |
2467 | sctx->stat.tree_extents_scrubbed++; | |
2468 | sctx->stat.tree_bytes_scrubbed += len; | |
2469 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2470 | } else { |
d9d181c1 | 2471 | blocksize = sctx->sectorsize; |
ff023aac | 2472 | WARN_ON(1); |
b5d67f64 | 2473 | } |
a2de733c AJ |
2474 | |
2475 | while (len) { | |
b5d67f64 | 2476 | u64 l = min_t(u64, len, blocksize); |
a2de733c AJ |
2477 | int have_csum = 0; |
2478 | ||
2479 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2480 | /* push csums to sbio */ | |
d9d181c1 | 2481 | have_csum = scrub_find_csum(sctx, logical, l, csum); |
a2de733c | 2482 | if (have_csum == 0) |
d9d181c1 | 2483 | ++sctx->stat.no_csum; |
ff023aac SB |
2484 | if (sctx->is_dev_replace && !have_csum) { |
2485 | ret = copy_nocow_pages(sctx, logical, l, | |
2486 | mirror_num, | |
2487 | physical_for_dev_replace); | |
2488 | goto behind_scrub_pages; | |
2489 | } | |
a2de733c | 2490 | } |
a36cf8b8 | 2491 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
ff023aac SB |
2492 | mirror_num, have_csum ? csum : NULL, 0, |
2493 | physical_for_dev_replace); | |
2494 | behind_scrub_pages: | |
a2de733c AJ |
2495 | if (ret) |
2496 | return ret; | |
2497 | len -= l; | |
2498 | logical += l; | |
2499 | physical += l; | |
ff023aac | 2500 | physical_for_dev_replace += l; |
a2de733c AJ |
2501 | } |
2502 | return 0; | |
2503 | } | |
2504 | ||
5a6ac9ea MX |
2505 | static int scrub_pages_for_parity(struct scrub_parity *sparity, |
2506 | u64 logical, u64 len, | |
2507 | u64 physical, struct btrfs_device *dev, | |
2508 | u64 flags, u64 gen, int mirror_num, u8 *csum) | |
2509 | { | |
2510 | struct scrub_ctx *sctx = sparity->sctx; | |
2511 | struct scrub_block *sblock; | |
2512 | int index; | |
2513 | ||
2514 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
2515 | if (!sblock) { | |
2516 | spin_lock(&sctx->stat_lock); | |
2517 | sctx->stat.malloc_errors++; | |
2518 | spin_unlock(&sctx->stat_lock); | |
2519 | return -ENOMEM; | |
2520 | } | |
2521 | ||
2522 | /* one ref inside this function, plus one for each page added to | |
2523 | * a bio later on */ | |
2524 | atomic_set(&sblock->ref_count, 1); | |
2525 | sblock->sctx = sctx; | |
2526 | sblock->no_io_error_seen = 1; | |
2527 | sblock->sparity = sparity; | |
2528 | scrub_parity_get(sparity); | |
2529 | ||
2530 | for (index = 0; len > 0; index++) { | |
2531 | struct scrub_page *spage; | |
2532 | u64 l = min_t(u64, len, PAGE_SIZE); | |
2533 | ||
2534 | spage = kzalloc(sizeof(*spage), GFP_NOFS); | |
2535 | if (!spage) { | |
2536 | leave_nomem: | |
2537 | spin_lock(&sctx->stat_lock); | |
2538 | sctx->stat.malloc_errors++; | |
2539 | spin_unlock(&sctx->stat_lock); | |
2540 | scrub_block_put(sblock); | |
2541 | return -ENOMEM; | |
2542 | } | |
2543 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); | |
2544 | /* For scrub block */ | |
2545 | scrub_page_get(spage); | |
2546 | sblock->pagev[index] = spage; | |
2547 | /* For scrub parity */ | |
2548 | scrub_page_get(spage); | |
2549 | list_add_tail(&spage->list, &sparity->spages); | |
2550 | spage->sblock = sblock; | |
2551 | spage->dev = dev; | |
2552 | spage->flags = flags; | |
2553 | spage->generation = gen; | |
2554 | spage->logical = logical; | |
2555 | spage->physical = physical; | |
2556 | spage->mirror_num = mirror_num; | |
2557 | if (csum) { | |
2558 | spage->have_csum = 1; | |
2559 | memcpy(spage->csum, csum, sctx->csum_size); | |
2560 | } else { | |
2561 | spage->have_csum = 0; | |
2562 | } | |
2563 | sblock->page_count++; | |
2564 | spage->page = alloc_page(GFP_NOFS); | |
2565 | if (!spage->page) | |
2566 | goto leave_nomem; | |
2567 | len -= l; | |
2568 | logical += l; | |
2569 | physical += l; | |
2570 | } | |
2571 | ||
2572 | WARN_ON(sblock->page_count == 0); | |
2573 | for (index = 0; index < sblock->page_count; index++) { | |
2574 | struct scrub_page *spage = sblock->pagev[index]; | |
2575 | int ret; | |
2576 | ||
2577 | ret = scrub_add_page_to_rd_bio(sctx, spage); | |
2578 | if (ret) { | |
2579 | scrub_block_put(sblock); | |
2580 | return ret; | |
2581 | } | |
2582 | } | |
2583 | ||
2584 | /* last one frees, either here or in bio completion for last page */ | |
2585 | scrub_block_put(sblock); | |
2586 | return 0; | |
2587 | } | |
2588 | ||
2589 | static int scrub_extent_for_parity(struct scrub_parity *sparity, | |
2590 | u64 logical, u64 len, | |
2591 | u64 physical, struct btrfs_device *dev, | |
2592 | u64 flags, u64 gen, int mirror_num) | |
2593 | { | |
2594 | struct scrub_ctx *sctx = sparity->sctx; | |
2595 | int ret; | |
2596 | u8 csum[BTRFS_CSUM_SIZE]; | |
2597 | u32 blocksize; | |
2598 | ||
2599 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2600 | blocksize = sctx->sectorsize; | |
2601 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
2602 | blocksize = sctx->nodesize; | |
2603 | } else { | |
2604 | blocksize = sctx->sectorsize; | |
2605 | WARN_ON(1); | |
2606 | } | |
2607 | ||
2608 | while (len) { | |
2609 | u64 l = min_t(u64, len, blocksize); | |
2610 | int have_csum = 0; | |
2611 | ||
2612 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2613 | /* push csums to sbio */ | |
2614 | have_csum = scrub_find_csum(sctx, logical, l, csum); | |
2615 | if (have_csum == 0) | |
2616 | goto skip; | |
2617 | } | |
2618 | ret = scrub_pages_for_parity(sparity, logical, l, physical, dev, | |
2619 | flags, gen, mirror_num, | |
2620 | have_csum ? csum : NULL); | |
5a6ac9ea MX |
2621 | if (ret) |
2622 | return ret; | |
6b6d24b3 | 2623 | skip: |
5a6ac9ea MX |
2624 | len -= l; |
2625 | logical += l; | |
2626 | physical += l; | |
2627 | } | |
2628 | return 0; | |
2629 | } | |
2630 | ||
3b080b25 WS |
2631 | /* |
2632 | * Given a physical address, this will calculate it's | |
2633 | * logical offset. if this is a parity stripe, it will return | |
2634 | * the most left data stripe's logical offset. | |
2635 | * | |
2636 | * return 0 if it is a data stripe, 1 means parity stripe. | |
2637 | */ | |
2638 | static int get_raid56_logic_offset(u64 physical, int num, | |
5a6ac9ea MX |
2639 | struct map_lookup *map, u64 *offset, |
2640 | u64 *stripe_start) | |
3b080b25 WS |
2641 | { |
2642 | int i; | |
2643 | int j = 0; | |
2644 | u64 stripe_nr; | |
2645 | u64 last_offset; | |
2646 | int stripe_index; | |
2647 | int rot; | |
2648 | ||
2649 | last_offset = (physical - map->stripes[num].physical) * | |
2650 | nr_data_stripes(map); | |
5a6ac9ea MX |
2651 | if (stripe_start) |
2652 | *stripe_start = last_offset; | |
2653 | ||
3b080b25 WS |
2654 | *offset = last_offset; |
2655 | for (i = 0; i < nr_data_stripes(map); i++) { | |
2656 | *offset = last_offset + i * map->stripe_len; | |
2657 | ||
2658 | stripe_nr = *offset; | |
2659 | do_div(stripe_nr, map->stripe_len); | |
2660 | do_div(stripe_nr, nr_data_stripes(map)); | |
2661 | ||
2662 | /* Work out the disk rotation on this stripe-set */ | |
2663 | rot = do_div(stripe_nr, map->num_stripes); | |
2664 | /* calculate which stripe this data locates */ | |
2665 | rot += i; | |
e4fbaee2 | 2666 | stripe_index = rot % map->num_stripes; |
3b080b25 WS |
2667 | if (stripe_index == num) |
2668 | return 0; | |
2669 | if (stripe_index < num) | |
2670 | j++; | |
2671 | } | |
2672 | *offset = last_offset + j * map->stripe_len; | |
2673 | return 1; | |
2674 | } | |
2675 | ||
5a6ac9ea MX |
2676 | static void scrub_free_parity(struct scrub_parity *sparity) |
2677 | { | |
2678 | struct scrub_ctx *sctx = sparity->sctx; | |
2679 | struct scrub_page *curr, *next; | |
2680 | int nbits; | |
2681 | ||
2682 | nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors); | |
2683 | if (nbits) { | |
2684 | spin_lock(&sctx->stat_lock); | |
2685 | sctx->stat.read_errors += nbits; | |
2686 | sctx->stat.uncorrectable_errors += nbits; | |
2687 | spin_unlock(&sctx->stat_lock); | |
2688 | } | |
2689 | ||
2690 | list_for_each_entry_safe(curr, next, &sparity->spages, list) { | |
2691 | list_del_init(&curr->list); | |
2692 | scrub_page_put(curr); | |
2693 | } | |
2694 | ||
2695 | kfree(sparity); | |
2696 | } | |
2697 | ||
2698 | static void scrub_parity_bio_endio(struct bio *bio, int error) | |
2699 | { | |
2700 | struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private; | |
2701 | struct scrub_ctx *sctx = sparity->sctx; | |
2702 | ||
2703 | if (error) | |
2704 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, | |
2705 | sparity->nsectors); | |
2706 | ||
2707 | scrub_free_parity(sparity); | |
2708 | scrub_pending_bio_dec(sctx); | |
2709 | bio_put(bio); | |
2710 | } | |
2711 | ||
2712 | static void scrub_parity_check_and_repair(struct scrub_parity *sparity) | |
2713 | { | |
2714 | struct scrub_ctx *sctx = sparity->sctx; | |
2715 | struct bio *bio; | |
2716 | struct btrfs_raid_bio *rbio; | |
2717 | struct scrub_page *spage; | |
2718 | struct btrfs_bio *bbio = NULL; | |
2719 | u64 *raid_map = NULL; | |
2720 | u64 length; | |
2721 | int ret; | |
2722 | ||
2723 | if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap, | |
2724 | sparity->nsectors)) | |
2725 | goto out; | |
2726 | ||
2727 | length = sparity->logic_end - sparity->logic_start + 1; | |
76035976 | 2728 | ret = btrfs_map_sblock(sctx->dev_root->fs_info, WRITE, |
5a6ac9ea MX |
2729 | sparity->logic_start, |
2730 | &length, &bbio, 0, &raid_map); | |
2731 | if (ret || !bbio || !raid_map) | |
2732 | goto bbio_out; | |
2733 | ||
2734 | bio = btrfs_io_bio_alloc(GFP_NOFS, 0); | |
2735 | if (!bio) | |
2736 | goto bbio_out; | |
2737 | ||
2738 | bio->bi_iter.bi_sector = sparity->logic_start >> 9; | |
2739 | bio->bi_private = sparity; | |
2740 | bio->bi_end_io = scrub_parity_bio_endio; | |
2741 | ||
2742 | rbio = raid56_parity_alloc_scrub_rbio(sctx->dev_root, bio, bbio, | |
2743 | raid_map, length, | |
2744 | sparity->scrub_dev, | |
2745 | sparity->dbitmap, | |
2746 | sparity->nsectors); | |
2747 | if (!rbio) | |
2748 | goto rbio_out; | |
2749 | ||
2750 | list_for_each_entry(spage, &sparity->spages, list) | |
2751 | raid56_parity_add_scrub_pages(rbio, spage->page, | |
2752 | spage->logical); | |
2753 | ||
2754 | scrub_pending_bio_inc(sctx); | |
2755 | raid56_parity_submit_scrub_rbio(rbio); | |
2756 | return; | |
2757 | ||
2758 | rbio_out: | |
2759 | bio_put(bio); | |
2760 | bbio_out: | |
2761 | kfree(bbio); | |
2762 | kfree(raid_map); | |
2763 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, | |
2764 | sparity->nsectors); | |
2765 | spin_lock(&sctx->stat_lock); | |
2766 | sctx->stat.malloc_errors++; | |
2767 | spin_unlock(&sctx->stat_lock); | |
2768 | out: | |
2769 | scrub_free_parity(sparity); | |
2770 | } | |
2771 | ||
2772 | static inline int scrub_calc_parity_bitmap_len(int nsectors) | |
2773 | { | |
2774 | return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * (BITS_PER_LONG / 8); | |
2775 | } | |
2776 | ||
2777 | static void scrub_parity_get(struct scrub_parity *sparity) | |
2778 | { | |
2779 | atomic_inc(&sparity->ref_count); | |
2780 | } | |
2781 | ||
2782 | static void scrub_parity_put(struct scrub_parity *sparity) | |
2783 | { | |
2784 | if (!atomic_dec_and_test(&sparity->ref_count)) | |
2785 | return; | |
2786 | ||
2787 | scrub_parity_check_and_repair(sparity); | |
2788 | } | |
2789 | ||
2790 | static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, | |
2791 | struct map_lookup *map, | |
2792 | struct btrfs_device *sdev, | |
2793 | struct btrfs_path *path, | |
2794 | u64 logic_start, | |
2795 | u64 logic_end) | |
2796 | { | |
2797 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
2798 | struct btrfs_root *root = fs_info->extent_root; | |
2799 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2800 | struct btrfs_extent_item *extent; | |
2801 | u64 flags; | |
2802 | int ret; | |
2803 | int slot; | |
2804 | struct extent_buffer *l; | |
2805 | struct btrfs_key key; | |
2806 | u64 generation; | |
2807 | u64 extent_logical; | |
2808 | u64 extent_physical; | |
2809 | u64 extent_len; | |
2810 | struct btrfs_device *extent_dev; | |
2811 | struct scrub_parity *sparity; | |
2812 | int nsectors; | |
2813 | int bitmap_len; | |
2814 | int extent_mirror_num; | |
2815 | int stop_loop = 0; | |
2816 | ||
2817 | nsectors = map->stripe_len / root->sectorsize; | |
2818 | bitmap_len = scrub_calc_parity_bitmap_len(nsectors); | |
2819 | sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len, | |
2820 | GFP_NOFS); | |
2821 | if (!sparity) { | |
2822 | spin_lock(&sctx->stat_lock); | |
2823 | sctx->stat.malloc_errors++; | |
2824 | spin_unlock(&sctx->stat_lock); | |
2825 | return -ENOMEM; | |
2826 | } | |
2827 | ||
2828 | sparity->stripe_len = map->stripe_len; | |
2829 | sparity->nsectors = nsectors; | |
2830 | sparity->sctx = sctx; | |
2831 | sparity->scrub_dev = sdev; | |
2832 | sparity->logic_start = logic_start; | |
2833 | sparity->logic_end = logic_end; | |
2834 | atomic_set(&sparity->ref_count, 1); | |
2835 | INIT_LIST_HEAD(&sparity->spages); | |
2836 | sparity->dbitmap = sparity->bitmap; | |
2837 | sparity->ebitmap = (void *)sparity->bitmap + bitmap_len; | |
2838 | ||
2839 | ret = 0; | |
2840 | while (logic_start < logic_end) { | |
2841 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) | |
2842 | key.type = BTRFS_METADATA_ITEM_KEY; | |
2843 | else | |
2844 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2845 | key.objectid = logic_start; | |
2846 | key.offset = (u64)-1; | |
2847 | ||
2848 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2849 | if (ret < 0) | |
2850 | goto out; | |
2851 | ||
2852 | if (ret > 0) { | |
2853 | ret = btrfs_previous_extent_item(root, path, 0); | |
2854 | if (ret < 0) | |
2855 | goto out; | |
2856 | if (ret > 0) { | |
2857 | btrfs_release_path(path); | |
2858 | ret = btrfs_search_slot(NULL, root, &key, | |
2859 | path, 0, 0); | |
2860 | if (ret < 0) | |
2861 | goto out; | |
2862 | } | |
2863 | } | |
2864 | ||
2865 | stop_loop = 0; | |
2866 | while (1) { | |
2867 | u64 bytes; | |
2868 | ||
2869 | l = path->nodes[0]; | |
2870 | slot = path->slots[0]; | |
2871 | if (slot >= btrfs_header_nritems(l)) { | |
2872 | ret = btrfs_next_leaf(root, path); | |
2873 | if (ret == 0) | |
2874 | continue; | |
2875 | if (ret < 0) | |
2876 | goto out; | |
2877 | ||
2878 | stop_loop = 1; | |
2879 | break; | |
2880 | } | |
2881 | btrfs_item_key_to_cpu(l, &key, slot); | |
2882 | ||
2883 | if (key.type == BTRFS_METADATA_ITEM_KEY) | |
2884 | bytes = root->nodesize; | |
2885 | else | |
2886 | bytes = key.offset; | |
2887 | ||
2888 | if (key.objectid + bytes <= logic_start) | |
2889 | goto next; | |
2890 | ||
2891 | if (key.type != BTRFS_EXTENT_ITEM_KEY && | |
2892 | key.type != BTRFS_METADATA_ITEM_KEY) | |
2893 | goto next; | |
2894 | ||
2895 | if (key.objectid > logic_end) { | |
2896 | stop_loop = 1; | |
2897 | break; | |
2898 | } | |
2899 | ||
2900 | while (key.objectid >= logic_start + map->stripe_len) | |
2901 | logic_start += map->stripe_len; | |
2902 | ||
2903 | extent = btrfs_item_ptr(l, slot, | |
2904 | struct btrfs_extent_item); | |
2905 | flags = btrfs_extent_flags(l, extent); | |
2906 | generation = btrfs_extent_generation(l, extent); | |
2907 | ||
2908 | if (key.objectid < logic_start && | |
2909 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { | |
2910 | btrfs_err(fs_info, | |
2911 | "scrub: tree block %llu spanning stripes, ignored. logical=%llu", | |
2912 | key.objectid, logic_start); | |
2913 | goto next; | |
2914 | } | |
2915 | again: | |
2916 | extent_logical = key.objectid; | |
2917 | extent_len = bytes; | |
2918 | ||
2919 | if (extent_logical < logic_start) { | |
2920 | extent_len -= logic_start - extent_logical; | |
2921 | extent_logical = logic_start; | |
2922 | } | |
2923 | ||
2924 | if (extent_logical + extent_len > | |
2925 | logic_start + map->stripe_len) | |
2926 | extent_len = logic_start + map->stripe_len - | |
2927 | extent_logical; | |
2928 | ||
2929 | scrub_parity_mark_sectors_data(sparity, extent_logical, | |
2930 | extent_len); | |
2931 | ||
2932 | scrub_remap_extent(fs_info, extent_logical, | |
2933 | extent_len, &extent_physical, | |
2934 | &extent_dev, | |
2935 | &extent_mirror_num); | |
2936 | ||
2937 | ret = btrfs_lookup_csums_range(csum_root, | |
2938 | extent_logical, | |
2939 | extent_logical + extent_len - 1, | |
2940 | &sctx->csum_list, 1); | |
2941 | if (ret) | |
2942 | goto out; | |
2943 | ||
2944 | ret = scrub_extent_for_parity(sparity, extent_logical, | |
2945 | extent_len, | |
2946 | extent_physical, | |
2947 | extent_dev, flags, | |
2948 | generation, | |
2949 | extent_mirror_num); | |
2950 | if (ret) | |
2951 | goto out; | |
2952 | ||
2953 | scrub_free_csums(sctx); | |
2954 | if (extent_logical + extent_len < | |
2955 | key.objectid + bytes) { | |
2956 | logic_start += map->stripe_len; | |
2957 | ||
2958 | if (logic_start >= logic_end) { | |
2959 | stop_loop = 1; | |
2960 | break; | |
2961 | } | |
2962 | ||
2963 | if (logic_start < key.objectid + bytes) { | |
2964 | cond_resched(); | |
2965 | goto again; | |
2966 | } | |
2967 | } | |
2968 | next: | |
2969 | path->slots[0]++; | |
2970 | } | |
2971 | ||
2972 | btrfs_release_path(path); | |
2973 | ||
2974 | if (stop_loop) | |
2975 | break; | |
2976 | ||
2977 | logic_start += map->stripe_len; | |
2978 | } | |
2979 | out: | |
2980 | if (ret < 0) | |
2981 | scrub_parity_mark_sectors_error(sparity, logic_start, | |
2982 | logic_end - logic_start + 1); | |
2983 | scrub_parity_put(sparity); | |
2984 | scrub_submit(sctx); | |
2985 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2986 | scrub_wr_submit(sctx); | |
2987 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2988 | ||
2989 | btrfs_release_path(path); | |
2990 | return ret < 0 ? ret : 0; | |
2991 | } | |
2992 | ||
d9d181c1 | 2993 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
a36cf8b8 SB |
2994 | struct map_lookup *map, |
2995 | struct btrfs_device *scrub_dev, | |
ff023aac SB |
2996 | int num, u64 base, u64 length, |
2997 | int is_dev_replace) | |
a2de733c | 2998 | { |
5a6ac9ea | 2999 | struct btrfs_path *path, *ppath; |
a36cf8b8 | 3000 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
a2de733c AJ |
3001 | struct btrfs_root *root = fs_info->extent_root; |
3002 | struct btrfs_root *csum_root = fs_info->csum_root; | |
3003 | struct btrfs_extent_item *extent; | |
e7786c3a | 3004 | struct blk_plug plug; |
a2de733c AJ |
3005 | u64 flags; |
3006 | int ret; | |
3007 | int slot; | |
a2de733c | 3008 | u64 nstripes; |
a2de733c AJ |
3009 | struct extent_buffer *l; |
3010 | struct btrfs_key key; | |
3011 | u64 physical; | |
3012 | u64 logical; | |
625f1c8d | 3013 | u64 logic_end; |
3b080b25 | 3014 | u64 physical_end; |
a2de733c | 3015 | u64 generation; |
e12fa9cd | 3016 | int mirror_num; |
7a26285e AJ |
3017 | struct reada_control *reada1; |
3018 | struct reada_control *reada2; | |
3019 | struct btrfs_key key_start; | |
3020 | struct btrfs_key key_end; | |
a2de733c AJ |
3021 | u64 increment = map->stripe_len; |
3022 | u64 offset; | |
ff023aac SB |
3023 | u64 extent_logical; |
3024 | u64 extent_physical; | |
3025 | u64 extent_len; | |
5a6ac9ea MX |
3026 | u64 stripe_logical; |
3027 | u64 stripe_end; | |
ff023aac SB |
3028 | struct btrfs_device *extent_dev; |
3029 | int extent_mirror_num; | |
3b080b25 | 3030 | int stop_loop = 0; |
53b381b3 | 3031 | |
a2de733c | 3032 | nstripes = length; |
3b080b25 | 3033 | physical = map->stripes[num].physical; |
a2de733c AJ |
3034 | offset = 0; |
3035 | do_div(nstripes, map->stripe_len); | |
3036 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3037 | offset = map->stripe_len * num; | |
3038 | increment = map->stripe_len * map->num_stripes; | |
193ea74b | 3039 | mirror_num = 1; |
a2de733c AJ |
3040 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
3041 | int factor = map->num_stripes / map->sub_stripes; | |
3042 | offset = map->stripe_len * (num / map->sub_stripes); | |
3043 | increment = map->stripe_len * factor; | |
193ea74b | 3044 | mirror_num = num % map->sub_stripes + 1; |
a2de733c AJ |
3045 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
3046 | increment = map->stripe_len; | |
193ea74b | 3047 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
3048 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
3049 | increment = map->stripe_len; | |
193ea74b | 3050 | mirror_num = num % map->num_stripes + 1; |
3b080b25 WS |
3051 | } else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | |
3052 | BTRFS_BLOCK_GROUP_RAID6)) { | |
5a6ac9ea | 3053 | get_raid56_logic_offset(physical, num, map, &offset, NULL); |
3b080b25 WS |
3054 | increment = map->stripe_len * nr_data_stripes(map); |
3055 | mirror_num = 1; | |
a2de733c AJ |
3056 | } else { |
3057 | increment = map->stripe_len; | |
193ea74b | 3058 | mirror_num = 1; |
a2de733c AJ |
3059 | } |
3060 | ||
3061 | path = btrfs_alloc_path(); | |
3062 | if (!path) | |
3063 | return -ENOMEM; | |
3064 | ||
5a6ac9ea MX |
3065 | ppath = btrfs_alloc_path(); |
3066 | if (!ppath) { | |
3067 | btrfs_free_path(ppath); | |
3068 | return -ENOMEM; | |
3069 | } | |
3070 | ||
b5d67f64 SB |
3071 | /* |
3072 | * work on commit root. The related disk blocks are static as | |
3073 | * long as COW is applied. This means, it is save to rewrite | |
3074 | * them to repair disk errors without any race conditions | |
3075 | */ | |
a2de733c AJ |
3076 | path->search_commit_root = 1; |
3077 | path->skip_locking = 1; | |
3078 | ||
3079 | /* | |
7a26285e AJ |
3080 | * trigger the readahead for extent tree csum tree and wait for |
3081 | * completion. During readahead, the scrub is officially paused | |
3082 | * to not hold off transaction commits | |
a2de733c AJ |
3083 | */ |
3084 | logical = base + offset; | |
3b080b25 WS |
3085 | physical_end = physical + nstripes * map->stripe_len; |
3086 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | | |
3087 | BTRFS_BLOCK_GROUP_RAID6)) { | |
3088 | get_raid56_logic_offset(physical_end, num, | |
5a6ac9ea | 3089 | map, &logic_end, NULL); |
3b080b25 WS |
3090 | logic_end += base; |
3091 | } else { | |
3092 | logic_end = logical + increment * nstripes; | |
3093 | } | |
d9d181c1 | 3094 | wait_event(sctx->list_wait, |
b6bfebc1 | 3095 | atomic_read(&sctx->bios_in_flight) == 0); |
cb7ab021 | 3096 | scrub_blocked_if_needed(fs_info); |
7a26285e AJ |
3097 | |
3098 | /* FIXME it might be better to start readahead at commit root */ | |
3099 | key_start.objectid = logical; | |
3100 | key_start.type = BTRFS_EXTENT_ITEM_KEY; | |
3101 | key_start.offset = (u64)0; | |
3b080b25 | 3102 | key_end.objectid = logic_end; |
3173a18f JB |
3103 | key_end.type = BTRFS_METADATA_ITEM_KEY; |
3104 | key_end.offset = (u64)-1; | |
7a26285e AJ |
3105 | reada1 = btrfs_reada_add(root, &key_start, &key_end); |
3106 | ||
3107 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
3108 | key_start.type = BTRFS_EXTENT_CSUM_KEY; | |
3109 | key_start.offset = logical; | |
3110 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
3111 | key_end.type = BTRFS_EXTENT_CSUM_KEY; | |
3b080b25 | 3112 | key_end.offset = logic_end; |
7a26285e AJ |
3113 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); |
3114 | ||
3115 | if (!IS_ERR(reada1)) | |
3116 | btrfs_reada_wait(reada1); | |
3117 | if (!IS_ERR(reada2)) | |
3118 | btrfs_reada_wait(reada2); | |
3119 | ||
a2de733c AJ |
3120 | |
3121 | /* | |
3122 | * collect all data csums for the stripe to avoid seeking during | |
3123 | * the scrub. This might currently (crc32) end up to be about 1MB | |
3124 | */ | |
e7786c3a | 3125 | blk_start_plug(&plug); |
a2de733c | 3126 | |
a2de733c AJ |
3127 | /* |
3128 | * now find all extents for each stripe and scrub them | |
3129 | */ | |
a2de733c | 3130 | ret = 0; |
3b080b25 WS |
3131 | while (physical < physical_end) { |
3132 | /* for raid56, we skip parity stripe */ | |
3133 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | | |
3134 | BTRFS_BLOCK_GROUP_RAID6)) { | |
3135 | ret = get_raid56_logic_offset(physical, num, | |
5a6ac9ea | 3136 | map, &logical, &stripe_logical); |
3b080b25 | 3137 | logical += base; |
5a6ac9ea MX |
3138 | if (ret) { |
3139 | stripe_logical += base; | |
3140 | stripe_end = stripe_logical + increment - 1; | |
3141 | ret = scrub_raid56_parity(sctx, map, scrub_dev, | |
3142 | ppath, stripe_logical, | |
3143 | stripe_end); | |
3144 | if (ret) | |
3145 | goto out; | |
3b080b25 | 3146 | goto skip; |
5a6ac9ea | 3147 | } |
3b080b25 | 3148 | } |
a2de733c AJ |
3149 | /* |
3150 | * canceled? | |
3151 | */ | |
3152 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
d9d181c1 | 3153 | atomic_read(&sctx->cancel_req)) { |
a2de733c AJ |
3154 | ret = -ECANCELED; |
3155 | goto out; | |
3156 | } | |
3157 | /* | |
3158 | * check to see if we have to pause | |
3159 | */ | |
3160 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
3161 | /* push queued extents */ | |
ff023aac | 3162 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
d9d181c1 | 3163 | scrub_submit(sctx); |
ff023aac SB |
3164 | mutex_lock(&sctx->wr_ctx.wr_lock); |
3165 | scrub_wr_submit(sctx); | |
3166 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
d9d181c1 | 3167 | wait_event(sctx->list_wait, |
b6bfebc1 | 3168 | atomic_read(&sctx->bios_in_flight) == 0); |
ff023aac | 3169 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
3cb0929a | 3170 | scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3171 | } |
3172 | ||
7c76edb7 WS |
3173 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
3174 | key.type = BTRFS_METADATA_ITEM_KEY; | |
3175 | else | |
3176 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
a2de733c | 3177 | key.objectid = logical; |
625f1c8d | 3178 | key.offset = (u64)-1; |
a2de733c AJ |
3179 | |
3180 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3181 | if (ret < 0) | |
3182 | goto out; | |
3173a18f | 3183 | |
8c51032f | 3184 | if (ret > 0) { |
ade2e0b3 | 3185 | ret = btrfs_previous_extent_item(root, path, 0); |
a2de733c AJ |
3186 | if (ret < 0) |
3187 | goto out; | |
8c51032f AJ |
3188 | if (ret > 0) { |
3189 | /* there's no smaller item, so stick with the | |
3190 | * larger one */ | |
3191 | btrfs_release_path(path); | |
3192 | ret = btrfs_search_slot(NULL, root, &key, | |
3193 | path, 0, 0); | |
3194 | if (ret < 0) | |
3195 | goto out; | |
3196 | } | |
a2de733c AJ |
3197 | } |
3198 | ||
625f1c8d | 3199 | stop_loop = 0; |
a2de733c | 3200 | while (1) { |
3173a18f JB |
3201 | u64 bytes; |
3202 | ||
a2de733c AJ |
3203 | l = path->nodes[0]; |
3204 | slot = path->slots[0]; | |
3205 | if (slot >= btrfs_header_nritems(l)) { | |
3206 | ret = btrfs_next_leaf(root, path); | |
3207 | if (ret == 0) | |
3208 | continue; | |
3209 | if (ret < 0) | |
3210 | goto out; | |
3211 | ||
625f1c8d | 3212 | stop_loop = 1; |
a2de733c AJ |
3213 | break; |
3214 | } | |
3215 | btrfs_item_key_to_cpu(l, &key, slot); | |
3216 | ||
3173a18f | 3217 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
707e8a07 | 3218 | bytes = root->nodesize; |
3173a18f JB |
3219 | else |
3220 | bytes = key.offset; | |
3221 | ||
3222 | if (key.objectid + bytes <= logical) | |
a2de733c AJ |
3223 | goto next; |
3224 | ||
625f1c8d LB |
3225 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
3226 | key.type != BTRFS_METADATA_ITEM_KEY) | |
3227 | goto next; | |
a2de733c | 3228 | |
625f1c8d LB |
3229 | if (key.objectid >= logical + map->stripe_len) { |
3230 | /* out of this device extent */ | |
3231 | if (key.objectid >= logic_end) | |
3232 | stop_loop = 1; | |
3233 | break; | |
3234 | } | |
a2de733c AJ |
3235 | |
3236 | extent = btrfs_item_ptr(l, slot, | |
3237 | struct btrfs_extent_item); | |
3238 | flags = btrfs_extent_flags(l, extent); | |
3239 | generation = btrfs_extent_generation(l, extent); | |
3240 | ||
3241 | if (key.objectid < logical && | |
3242 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { | |
efe120a0 FH |
3243 | btrfs_err(fs_info, |
3244 | "scrub: tree block %llu spanning " | |
3245 | "stripes, ignored. logical=%llu", | |
c1c9ff7c | 3246 | key.objectid, logical); |
a2de733c AJ |
3247 | goto next; |
3248 | } | |
3249 | ||
625f1c8d LB |
3250 | again: |
3251 | extent_logical = key.objectid; | |
3252 | extent_len = bytes; | |
3253 | ||
a2de733c AJ |
3254 | /* |
3255 | * trim extent to this stripe | |
3256 | */ | |
625f1c8d LB |
3257 | if (extent_logical < logical) { |
3258 | extent_len -= logical - extent_logical; | |
3259 | extent_logical = logical; | |
a2de733c | 3260 | } |
625f1c8d | 3261 | if (extent_logical + extent_len > |
a2de733c | 3262 | logical + map->stripe_len) { |
625f1c8d LB |
3263 | extent_len = logical + map->stripe_len - |
3264 | extent_logical; | |
a2de733c AJ |
3265 | } |
3266 | ||
625f1c8d | 3267 | extent_physical = extent_logical - logical + physical; |
ff023aac SB |
3268 | extent_dev = scrub_dev; |
3269 | extent_mirror_num = mirror_num; | |
3270 | if (is_dev_replace) | |
3271 | scrub_remap_extent(fs_info, extent_logical, | |
3272 | extent_len, &extent_physical, | |
3273 | &extent_dev, | |
3274 | &extent_mirror_num); | |
625f1c8d LB |
3275 | |
3276 | ret = btrfs_lookup_csums_range(csum_root, logical, | |
3277 | logical + map->stripe_len - 1, | |
3278 | &sctx->csum_list, 1); | |
3279 | if (ret) | |
3280 | goto out; | |
3281 | ||
ff023aac SB |
3282 | ret = scrub_extent(sctx, extent_logical, extent_len, |
3283 | extent_physical, extent_dev, flags, | |
3284 | generation, extent_mirror_num, | |
115930cb | 3285 | extent_logical - logical + physical); |
a2de733c AJ |
3286 | if (ret) |
3287 | goto out; | |
3288 | ||
d88d46c6 | 3289 | scrub_free_csums(sctx); |
625f1c8d LB |
3290 | if (extent_logical + extent_len < |
3291 | key.objectid + bytes) { | |
3b080b25 WS |
3292 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | |
3293 | BTRFS_BLOCK_GROUP_RAID6)) { | |
3294 | /* | |
3295 | * loop until we find next data stripe | |
3296 | * or we have finished all stripes. | |
3297 | */ | |
5a6ac9ea MX |
3298 | loop: |
3299 | physical += map->stripe_len; | |
3300 | ret = get_raid56_logic_offset(physical, | |
3301 | num, map, &logical, | |
3302 | &stripe_logical); | |
3303 | logical += base; | |
3304 | ||
3305 | if (ret && physical < physical_end) { | |
3306 | stripe_logical += base; | |
3307 | stripe_end = stripe_logical + | |
3308 | increment - 1; | |
3309 | ret = scrub_raid56_parity(sctx, | |
3310 | map, scrub_dev, ppath, | |
3311 | stripe_logical, | |
3312 | stripe_end); | |
3313 | if (ret) | |
3314 | goto out; | |
3315 | goto loop; | |
3316 | } | |
3b080b25 WS |
3317 | } else { |
3318 | physical += map->stripe_len; | |
3319 | logical += increment; | |
3320 | } | |
625f1c8d LB |
3321 | if (logical < key.objectid + bytes) { |
3322 | cond_resched(); | |
3323 | goto again; | |
3324 | } | |
3325 | ||
3b080b25 | 3326 | if (physical >= physical_end) { |
625f1c8d LB |
3327 | stop_loop = 1; |
3328 | break; | |
3329 | } | |
3330 | } | |
a2de733c AJ |
3331 | next: |
3332 | path->slots[0]++; | |
3333 | } | |
71267333 | 3334 | btrfs_release_path(path); |
3b080b25 | 3335 | skip: |
a2de733c AJ |
3336 | logical += increment; |
3337 | physical += map->stripe_len; | |
d9d181c1 | 3338 | spin_lock(&sctx->stat_lock); |
625f1c8d LB |
3339 | if (stop_loop) |
3340 | sctx->stat.last_physical = map->stripes[num].physical + | |
3341 | length; | |
3342 | else | |
3343 | sctx->stat.last_physical = physical; | |
d9d181c1 | 3344 | spin_unlock(&sctx->stat_lock); |
625f1c8d LB |
3345 | if (stop_loop) |
3346 | break; | |
a2de733c | 3347 | } |
ff023aac | 3348 | out: |
a2de733c | 3349 | /* push queued extents */ |
d9d181c1 | 3350 | scrub_submit(sctx); |
ff023aac SB |
3351 | mutex_lock(&sctx->wr_ctx.wr_lock); |
3352 | scrub_wr_submit(sctx); | |
3353 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
a2de733c | 3354 | |
e7786c3a | 3355 | blk_finish_plug(&plug); |
a2de733c | 3356 | btrfs_free_path(path); |
5a6ac9ea | 3357 | btrfs_free_path(ppath); |
a2de733c AJ |
3358 | return ret < 0 ? ret : 0; |
3359 | } | |
3360 | ||
d9d181c1 | 3361 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
a36cf8b8 SB |
3362 | struct btrfs_device *scrub_dev, |
3363 | u64 chunk_tree, u64 chunk_objectid, | |
3364 | u64 chunk_offset, u64 length, | |
ff023aac | 3365 | u64 dev_offset, int is_dev_replace) |
a2de733c AJ |
3366 | { |
3367 | struct btrfs_mapping_tree *map_tree = | |
a36cf8b8 | 3368 | &sctx->dev_root->fs_info->mapping_tree; |
a2de733c AJ |
3369 | struct map_lookup *map; |
3370 | struct extent_map *em; | |
3371 | int i; | |
ff023aac | 3372 | int ret = 0; |
a2de733c AJ |
3373 | |
3374 | read_lock(&map_tree->map_tree.lock); | |
3375 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | |
3376 | read_unlock(&map_tree->map_tree.lock); | |
3377 | ||
3378 | if (!em) | |
3379 | return -EINVAL; | |
3380 | ||
3381 | map = (struct map_lookup *)em->bdev; | |
3382 | if (em->start != chunk_offset) | |
3383 | goto out; | |
3384 | ||
3385 | if (em->len < length) | |
3386 | goto out; | |
3387 | ||
3388 | for (i = 0; i < map->num_stripes; ++i) { | |
a36cf8b8 | 3389 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
859acaf1 | 3390 | map->stripes[i].physical == dev_offset) { |
a36cf8b8 | 3391 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
ff023aac SB |
3392 | chunk_offset, length, |
3393 | is_dev_replace); | |
a2de733c AJ |
3394 | if (ret) |
3395 | goto out; | |
3396 | } | |
3397 | } | |
3398 | out: | |
3399 | free_extent_map(em); | |
3400 | ||
3401 | return ret; | |
3402 | } | |
3403 | ||
3404 | static noinline_for_stack | |
a36cf8b8 | 3405 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
ff023aac SB |
3406 | struct btrfs_device *scrub_dev, u64 start, u64 end, |
3407 | int is_dev_replace) | |
a2de733c AJ |
3408 | { |
3409 | struct btrfs_dev_extent *dev_extent = NULL; | |
3410 | struct btrfs_path *path; | |
a36cf8b8 | 3411 | struct btrfs_root *root = sctx->dev_root; |
a2de733c AJ |
3412 | struct btrfs_fs_info *fs_info = root->fs_info; |
3413 | u64 length; | |
3414 | u64 chunk_tree; | |
3415 | u64 chunk_objectid; | |
3416 | u64 chunk_offset; | |
3417 | int ret; | |
3418 | int slot; | |
3419 | struct extent_buffer *l; | |
3420 | struct btrfs_key key; | |
3421 | struct btrfs_key found_key; | |
3422 | struct btrfs_block_group_cache *cache; | |
ff023aac | 3423 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
a2de733c AJ |
3424 | |
3425 | path = btrfs_alloc_path(); | |
3426 | if (!path) | |
3427 | return -ENOMEM; | |
3428 | ||
3429 | path->reada = 2; | |
3430 | path->search_commit_root = 1; | |
3431 | path->skip_locking = 1; | |
3432 | ||
a36cf8b8 | 3433 | key.objectid = scrub_dev->devid; |
a2de733c AJ |
3434 | key.offset = 0ull; |
3435 | key.type = BTRFS_DEV_EXTENT_KEY; | |
3436 | ||
a2de733c AJ |
3437 | while (1) { |
3438 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3439 | if (ret < 0) | |
8c51032f AJ |
3440 | break; |
3441 | if (ret > 0) { | |
3442 | if (path->slots[0] >= | |
3443 | btrfs_header_nritems(path->nodes[0])) { | |
3444 | ret = btrfs_next_leaf(root, path); | |
3445 | if (ret) | |
3446 | break; | |
3447 | } | |
3448 | } | |
a2de733c AJ |
3449 | |
3450 | l = path->nodes[0]; | |
3451 | slot = path->slots[0]; | |
3452 | ||
3453 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
3454 | ||
a36cf8b8 | 3455 | if (found_key.objectid != scrub_dev->devid) |
a2de733c AJ |
3456 | break; |
3457 | ||
962a298f | 3458 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) |
a2de733c AJ |
3459 | break; |
3460 | ||
3461 | if (found_key.offset >= end) | |
3462 | break; | |
3463 | ||
3464 | if (found_key.offset < key.offset) | |
3465 | break; | |
3466 | ||
3467 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
3468 | length = btrfs_dev_extent_length(l, dev_extent); | |
3469 | ||
ced96edc QW |
3470 | if (found_key.offset + length <= start) |
3471 | goto skip; | |
a2de733c AJ |
3472 | |
3473 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
3474 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
3475 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
3476 | ||
3477 | /* | |
3478 | * get a reference on the corresponding block group to prevent | |
3479 | * the chunk from going away while we scrub it | |
3480 | */ | |
3481 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
ced96edc QW |
3482 | |
3483 | /* some chunks are removed but not committed to disk yet, | |
3484 | * continue scrubbing */ | |
3485 | if (!cache) | |
3486 | goto skip; | |
3487 | ||
ff023aac SB |
3488 | dev_replace->cursor_right = found_key.offset + length; |
3489 | dev_replace->cursor_left = found_key.offset; | |
3490 | dev_replace->item_needs_writeback = 1; | |
a36cf8b8 | 3491 | ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid, |
ff023aac SB |
3492 | chunk_offset, length, found_key.offset, |
3493 | is_dev_replace); | |
3494 | ||
3495 | /* | |
3496 | * flush, submit all pending read and write bios, afterwards | |
3497 | * wait for them. | |
3498 | * Note that in the dev replace case, a read request causes | |
3499 | * write requests that are submitted in the read completion | |
3500 | * worker. Therefore in the current situation, it is required | |
3501 | * that all write requests are flushed, so that all read and | |
3502 | * write requests are really completed when bios_in_flight | |
3503 | * changes to 0. | |
3504 | */ | |
3505 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); | |
3506 | scrub_submit(sctx); | |
3507 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
3508 | scrub_wr_submit(sctx); | |
3509 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
3510 | ||
3511 | wait_event(sctx->list_wait, | |
3512 | atomic_read(&sctx->bios_in_flight) == 0); | |
12cf9372 WS |
3513 | atomic_inc(&fs_info->scrubs_paused); |
3514 | wake_up(&fs_info->scrub_pause_wait); | |
3515 | ||
3516 | /* | |
3517 | * must be called before we decrease @scrub_paused. | |
3518 | * make sure we don't block transaction commit while | |
3519 | * we are waiting pending workers finished. | |
3520 | */ | |
ff023aac SB |
3521 | wait_event(sctx->list_wait, |
3522 | atomic_read(&sctx->workers_pending) == 0); | |
12cf9372 WS |
3523 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
3524 | ||
3525 | mutex_lock(&fs_info->scrub_lock); | |
3526 | __scrub_blocked_if_needed(fs_info); | |
3527 | atomic_dec(&fs_info->scrubs_paused); | |
3528 | mutex_unlock(&fs_info->scrub_lock); | |
3529 | wake_up(&fs_info->scrub_pause_wait); | |
ff023aac | 3530 | |
a2de733c AJ |
3531 | btrfs_put_block_group(cache); |
3532 | if (ret) | |
3533 | break; | |
af1be4f8 SB |
3534 | if (is_dev_replace && |
3535 | atomic64_read(&dev_replace->num_write_errors) > 0) { | |
ff023aac SB |
3536 | ret = -EIO; |
3537 | break; | |
3538 | } | |
3539 | if (sctx->stat.malloc_errors > 0) { | |
3540 | ret = -ENOMEM; | |
3541 | break; | |
3542 | } | |
a2de733c | 3543 | |
539f358a ID |
3544 | dev_replace->cursor_left = dev_replace->cursor_right; |
3545 | dev_replace->item_needs_writeback = 1; | |
ced96edc | 3546 | skip: |
a2de733c | 3547 | key.offset = found_key.offset + length; |
71267333 | 3548 | btrfs_release_path(path); |
a2de733c AJ |
3549 | } |
3550 | ||
a2de733c | 3551 | btrfs_free_path(path); |
8c51032f AJ |
3552 | |
3553 | /* | |
3554 | * ret can still be 1 from search_slot or next_leaf, | |
3555 | * that's not an error | |
3556 | */ | |
3557 | return ret < 0 ? ret : 0; | |
a2de733c AJ |
3558 | } |
3559 | ||
a36cf8b8 SB |
3560 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
3561 | struct btrfs_device *scrub_dev) | |
a2de733c AJ |
3562 | { |
3563 | int i; | |
3564 | u64 bytenr; | |
3565 | u64 gen; | |
3566 | int ret; | |
a36cf8b8 | 3567 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 3568 | |
87533c47 | 3569 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
79787eaa JM |
3570 | return -EIO; |
3571 | ||
5f546063 MX |
3572 | /* Seed devices of a new filesystem has their own generation. */ |
3573 | if (scrub_dev->fs_devices != root->fs_info->fs_devices) | |
3574 | gen = scrub_dev->generation; | |
3575 | else | |
3576 | gen = root->fs_info->last_trans_committed; | |
a2de733c AJ |
3577 | |
3578 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
3579 | bytenr = btrfs_sb_offset(i); | |
935e5cc9 MX |
3580 | if (bytenr + BTRFS_SUPER_INFO_SIZE > |
3581 | scrub_dev->commit_total_bytes) | |
a2de733c AJ |
3582 | break; |
3583 | ||
d9d181c1 | 3584 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
a36cf8b8 | 3585 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
ff023aac | 3586 | NULL, 1, bytenr); |
a2de733c AJ |
3587 | if (ret) |
3588 | return ret; | |
3589 | } | |
b6bfebc1 | 3590 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3591 | |
3592 | return 0; | |
3593 | } | |
3594 | ||
3595 | /* | |
3596 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
3597 | */ | |
ff023aac SB |
3598 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
3599 | int is_dev_replace) | |
a2de733c | 3600 | { |
0dc3b84a | 3601 | int ret = 0; |
0339ef2f QW |
3602 | int flags = WQ_FREEZABLE | WQ_UNBOUND; |
3603 | int max_active = fs_info->thread_pool_size; | |
a2de733c | 3604 | |
632dd772 | 3605 | if (fs_info->scrub_workers_refcnt == 0) { |
ff023aac | 3606 | if (is_dev_replace) |
0339ef2f QW |
3607 | fs_info->scrub_workers = |
3608 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
3609 | 1, 4); | |
ff023aac | 3610 | else |
0339ef2f QW |
3611 | fs_info->scrub_workers = |
3612 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
3613 | max_active, 4); | |
3614 | if (!fs_info->scrub_workers) { | |
3615 | ret = -ENOMEM; | |
0dc3b84a | 3616 | goto out; |
0339ef2f QW |
3617 | } |
3618 | fs_info->scrub_wr_completion_workers = | |
3619 | btrfs_alloc_workqueue("btrfs-scrubwrc", flags, | |
3620 | max_active, 2); | |
3621 | if (!fs_info->scrub_wr_completion_workers) { | |
3622 | ret = -ENOMEM; | |
ff023aac | 3623 | goto out; |
0339ef2f QW |
3624 | } |
3625 | fs_info->scrub_nocow_workers = | |
3626 | btrfs_alloc_workqueue("btrfs-scrubnc", flags, 1, 0); | |
3627 | if (!fs_info->scrub_nocow_workers) { | |
3628 | ret = -ENOMEM; | |
ff023aac | 3629 | goto out; |
0339ef2f | 3630 | } |
632dd772 | 3631 | } |
a2de733c | 3632 | ++fs_info->scrub_workers_refcnt; |
0dc3b84a | 3633 | out: |
0dc3b84a | 3634 | return ret; |
a2de733c AJ |
3635 | } |
3636 | ||
aa1b8cd4 | 3637 | static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info) |
a2de733c | 3638 | { |
ff023aac | 3639 | if (--fs_info->scrub_workers_refcnt == 0) { |
0339ef2f QW |
3640 | btrfs_destroy_workqueue(fs_info->scrub_workers); |
3641 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); | |
3642 | btrfs_destroy_workqueue(fs_info->scrub_nocow_workers); | |
ff023aac | 3643 | } |
a2de733c | 3644 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
a2de733c AJ |
3645 | } |
3646 | ||
aa1b8cd4 SB |
3647 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
3648 | u64 end, struct btrfs_scrub_progress *progress, | |
63a212ab | 3649 | int readonly, int is_dev_replace) |
a2de733c | 3650 | { |
d9d181c1 | 3651 | struct scrub_ctx *sctx; |
a2de733c AJ |
3652 | int ret; |
3653 | struct btrfs_device *dev; | |
5d68da3b | 3654 | struct rcu_string *name; |
a2de733c | 3655 | |
aa1b8cd4 | 3656 | if (btrfs_fs_closing(fs_info)) |
a2de733c AJ |
3657 | return -EINVAL; |
3658 | ||
aa1b8cd4 | 3659 | if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) { |
b5d67f64 SB |
3660 | /* |
3661 | * in this case scrub is unable to calculate the checksum | |
3662 | * the way scrub is implemented. Do not handle this | |
3663 | * situation at all because it won't ever happen. | |
3664 | */ | |
efe120a0 FH |
3665 | btrfs_err(fs_info, |
3666 | "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails", | |
aa1b8cd4 | 3667 | fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN); |
b5d67f64 SB |
3668 | return -EINVAL; |
3669 | } | |
3670 | ||
aa1b8cd4 | 3671 | if (fs_info->chunk_root->sectorsize != PAGE_SIZE) { |
b5d67f64 | 3672 | /* not supported for data w/o checksums */ |
efe120a0 FH |
3673 | btrfs_err(fs_info, |
3674 | "scrub: size assumption sectorsize != PAGE_SIZE " | |
3675 | "(%d != %lu) fails", | |
27f9f023 | 3676 | fs_info->chunk_root->sectorsize, PAGE_SIZE); |
a2de733c AJ |
3677 | return -EINVAL; |
3678 | } | |
3679 | ||
7a9e9987 SB |
3680 | if (fs_info->chunk_root->nodesize > |
3681 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || | |
3682 | fs_info->chunk_root->sectorsize > | |
3683 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { | |
3684 | /* | |
3685 | * would exhaust the array bounds of pagev member in | |
3686 | * struct scrub_block | |
3687 | */ | |
efe120a0 FH |
3688 | btrfs_err(fs_info, "scrub: size assumption nodesize and sectorsize " |
3689 | "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails", | |
7a9e9987 SB |
3690 | fs_info->chunk_root->nodesize, |
3691 | SCRUB_MAX_PAGES_PER_BLOCK, | |
3692 | fs_info->chunk_root->sectorsize, | |
3693 | SCRUB_MAX_PAGES_PER_BLOCK); | |
3694 | return -EINVAL; | |
3695 | } | |
3696 | ||
a2de733c | 3697 | |
aa1b8cd4 SB |
3698 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
3699 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); | |
63a212ab | 3700 | if (!dev || (dev->missing && !is_dev_replace)) { |
aa1b8cd4 | 3701 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
3702 | return -ENODEV; |
3703 | } | |
a2de733c | 3704 | |
5d68da3b MX |
3705 | if (!is_dev_replace && !readonly && !dev->writeable) { |
3706 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
3707 | rcu_read_lock(); | |
3708 | name = rcu_dereference(dev->name); | |
3709 | btrfs_err(fs_info, "scrub: device %s is not writable", | |
3710 | name->str); | |
3711 | rcu_read_unlock(); | |
3712 | return -EROFS; | |
3713 | } | |
3714 | ||
3b7a016f | 3715 | mutex_lock(&fs_info->scrub_lock); |
63a212ab | 3716 | if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) { |
a2de733c | 3717 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3718 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
aa1b8cd4 | 3719 | return -EIO; |
a2de733c AJ |
3720 | } |
3721 | ||
8dabb742 SB |
3722 | btrfs_dev_replace_lock(&fs_info->dev_replace); |
3723 | if (dev->scrub_device || | |
3724 | (!is_dev_replace && | |
3725 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { | |
3726 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
a2de733c | 3727 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 3728 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
3729 | return -EINPROGRESS; |
3730 | } | |
8dabb742 | 3731 | btrfs_dev_replace_unlock(&fs_info->dev_replace); |
3b7a016f WS |
3732 | |
3733 | ret = scrub_workers_get(fs_info, is_dev_replace); | |
3734 | if (ret) { | |
3735 | mutex_unlock(&fs_info->scrub_lock); | |
3736 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
3737 | return ret; | |
3738 | } | |
3739 | ||
63a212ab | 3740 | sctx = scrub_setup_ctx(dev, is_dev_replace); |
d9d181c1 | 3741 | if (IS_ERR(sctx)) { |
a2de733c | 3742 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 SB |
3743 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
3744 | scrub_workers_put(fs_info); | |
d9d181c1 | 3745 | return PTR_ERR(sctx); |
a2de733c | 3746 | } |
d9d181c1 SB |
3747 | sctx->readonly = readonly; |
3748 | dev->scrub_device = sctx; | |
3cb0929a | 3749 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 3750 | |
3cb0929a WS |
3751 | /* |
3752 | * checking @scrub_pause_req here, we can avoid | |
3753 | * race between committing transaction and scrubbing. | |
3754 | */ | |
cb7ab021 | 3755 | __scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3756 | atomic_inc(&fs_info->scrubs_running); |
3757 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c | 3758 | |
ff023aac | 3759 | if (!is_dev_replace) { |
9b011adf WS |
3760 | /* |
3761 | * by holding device list mutex, we can | |
3762 | * kick off writing super in log tree sync. | |
3763 | */ | |
3cb0929a | 3764 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3765 | ret = scrub_supers(sctx, dev); |
3cb0929a | 3766 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3767 | } |
a2de733c AJ |
3768 | |
3769 | if (!ret) | |
ff023aac SB |
3770 | ret = scrub_enumerate_chunks(sctx, dev, start, end, |
3771 | is_dev_replace); | |
a2de733c | 3772 | |
b6bfebc1 | 3773 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3774 | atomic_dec(&fs_info->scrubs_running); |
3775 | wake_up(&fs_info->scrub_pause_wait); | |
3776 | ||
b6bfebc1 | 3777 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
0ef8e451 | 3778 | |
a2de733c | 3779 | if (progress) |
d9d181c1 | 3780 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
a2de733c AJ |
3781 | |
3782 | mutex_lock(&fs_info->scrub_lock); | |
3783 | dev->scrub_device = NULL; | |
3b7a016f | 3784 | scrub_workers_put(fs_info); |
a2de733c AJ |
3785 | mutex_unlock(&fs_info->scrub_lock); |
3786 | ||
d9d181c1 | 3787 | scrub_free_ctx(sctx); |
a2de733c AJ |
3788 | |
3789 | return ret; | |
3790 | } | |
3791 | ||
143bede5 | 3792 | void btrfs_scrub_pause(struct btrfs_root *root) |
a2de733c AJ |
3793 | { |
3794 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3795 | ||
3796 | mutex_lock(&fs_info->scrub_lock); | |
3797 | atomic_inc(&fs_info->scrub_pause_req); | |
3798 | while (atomic_read(&fs_info->scrubs_paused) != | |
3799 | atomic_read(&fs_info->scrubs_running)) { | |
3800 | mutex_unlock(&fs_info->scrub_lock); | |
3801 | wait_event(fs_info->scrub_pause_wait, | |
3802 | atomic_read(&fs_info->scrubs_paused) == | |
3803 | atomic_read(&fs_info->scrubs_running)); | |
3804 | mutex_lock(&fs_info->scrub_lock); | |
3805 | } | |
3806 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c AJ |
3807 | } |
3808 | ||
143bede5 | 3809 | void btrfs_scrub_continue(struct btrfs_root *root) |
a2de733c AJ |
3810 | { |
3811 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3812 | ||
3813 | atomic_dec(&fs_info->scrub_pause_req); | |
3814 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
3815 | } |
3816 | ||
aa1b8cd4 | 3817 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
a2de733c | 3818 | { |
a2de733c AJ |
3819 | mutex_lock(&fs_info->scrub_lock); |
3820 | if (!atomic_read(&fs_info->scrubs_running)) { | |
3821 | mutex_unlock(&fs_info->scrub_lock); | |
3822 | return -ENOTCONN; | |
3823 | } | |
3824 | ||
3825 | atomic_inc(&fs_info->scrub_cancel_req); | |
3826 | while (atomic_read(&fs_info->scrubs_running)) { | |
3827 | mutex_unlock(&fs_info->scrub_lock); | |
3828 | wait_event(fs_info->scrub_pause_wait, | |
3829 | atomic_read(&fs_info->scrubs_running) == 0); | |
3830 | mutex_lock(&fs_info->scrub_lock); | |
3831 | } | |
3832 | atomic_dec(&fs_info->scrub_cancel_req); | |
3833 | mutex_unlock(&fs_info->scrub_lock); | |
3834 | ||
3835 | return 0; | |
3836 | } | |
3837 | ||
aa1b8cd4 SB |
3838 | int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info, |
3839 | struct btrfs_device *dev) | |
49b25e05 | 3840 | { |
d9d181c1 | 3841 | struct scrub_ctx *sctx; |
a2de733c AJ |
3842 | |
3843 | mutex_lock(&fs_info->scrub_lock); | |
d9d181c1 SB |
3844 | sctx = dev->scrub_device; |
3845 | if (!sctx) { | |
a2de733c AJ |
3846 | mutex_unlock(&fs_info->scrub_lock); |
3847 | return -ENOTCONN; | |
3848 | } | |
d9d181c1 | 3849 | atomic_inc(&sctx->cancel_req); |
a2de733c AJ |
3850 | while (dev->scrub_device) { |
3851 | mutex_unlock(&fs_info->scrub_lock); | |
3852 | wait_event(fs_info->scrub_pause_wait, | |
3853 | dev->scrub_device == NULL); | |
3854 | mutex_lock(&fs_info->scrub_lock); | |
3855 | } | |
3856 | mutex_unlock(&fs_info->scrub_lock); | |
3857 | ||
3858 | return 0; | |
3859 | } | |
1623edeb | 3860 | |
a2de733c AJ |
3861 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, |
3862 | struct btrfs_scrub_progress *progress) | |
3863 | { | |
3864 | struct btrfs_device *dev; | |
d9d181c1 | 3865 | struct scrub_ctx *sctx = NULL; |
a2de733c AJ |
3866 | |
3867 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
aa1b8cd4 | 3868 | dev = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
a2de733c | 3869 | if (dev) |
d9d181c1 SB |
3870 | sctx = dev->scrub_device; |
3871 | if (sctx) | |
3872 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
a2de733c AJ |
3873 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
3874 | ||
d9d181c1 | 3875 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
a2de733c | 3876 | } |
ff023aac SB |
3877 | |
3878 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
3879 | u64 extent_logical, u64 extent_len, | |
3880 | u64 *extent_physical, | |
3881 | struct btrfs_device **extent_dev, | |
3882 | int *extent_mirror_num) | |
3883 | { | |
3884 | u64 mapped_length; | |
3885 | struct btrfs_bio *bbio = NULL; | |
3886 | int ret; | |
3887 | ||
3888 | mapped_length = extent_len; | |
3889 | ret = btrfs_map_block(fs_info, READ, extent_logical, | |
3890 | &mapped_length, &bbio, 0); | |
3891 | if (ret || !bbio || mapped_length < extent_len || | |
3892 | !bbio->stripes[0].dev->bdev) { | |
3893 | kfree(bbio); | |
3894 | return; | |
3895 | } | |
3896 | ||
3897 | *extent_physical = bbio->stripes[0].physical; | |
3898 | *extent_mirror_num = bbio->mirror_num; | |
3899 | *extent_dev = bbio->stripes[0].dev; | |
3900 | kfree(bbio); | |
3901 | } | |
3902 | ||
3903 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
3904 | struct scrub_wr_ctx *wr_ctx, | |
3905 | struct btrfs_fs_info *fs_info, | |
3906 | struct btrfs_device *dev, | |
3907 | int is_dev_replace) | |
3908 | { | |
3909 | WARN_ON(wr_ctx->wr_curr_bio != NULL); | |
3910 | ||
3911 | mutex_init(&wr_ctx->wr_lock); | |
3912 | wr_ctx->wr_curr_bio = NULL; | |
3913 | if (!is_dev_replace) | |
3914 | return 0; | |
3915 | ||
3916 | WARN_ON(!dev->bdev); | |
3917 | wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO, | |
3918 | bio_get_nr_vecs(dev->bdev)); | |
3919 | wr_ctx->tgtdev = dev; | |
3920 | atomic_set(&wr_ctx->flush_all_writes, 0); | |
3921 | return 0; | |
3922 | } | |
3923 | ||
3924 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx) | |
3925 | { | |
3926 | mutex_lock(&wr_ctx->wr_lock); | |
3927 | kfree(wr_ctx->wr_curr_bio); | |
3928 | wr_ctx->wr_curr_bio = NULL; | |
3929 | mutex_unlock(&wr_ctx->wr_lock); | |
3930 | } | |
3931 | ||
3932 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, | |
3933 | int mirror_num, u64 physical_for_dev_replace) | |
3934 | { | |
3935 | struct scrub_copy_nocow_ctx *nocow_ctx; | |
3936 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
3937 | ||
3938 | nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS); | |
3939 | if (!nocow_ctx) { | |
3940 | spin_lock(&sctx->stat_lock); | |
3941 | sctx->stat.malloc_errors++; | |
3942 | spin_unlock(&sctx->stat_lock); | |
3943 | return -ENOMEM; | |
3944 | } | |
3945 | ||
3946 | scrub_pending_trans_workers_inc(sctx); | |
3947 | ||
3948 | nocow_ctx->sctx = sctx; | |
3949 | nocow_ctx->logical = logical; | |
3950 | nocow_ctx->len = len; | |
3951 | nocow_ctx->mirror_num = mirror_num; | |
3952 | nocow_ctx->physical_for_dev_replace = physical_for_dev_replace; | |
9e0af237 LB |
3953 | btrfs_init_work(&nocow_ctx->work, btrfs_scrubnc_helper, |
3954 | copy_nocow_pages_worker, NULL, NULL); | |
652f25a2 | 3955 | INIT_LIST_HEAD(&nocow_ctx->inodes); |
0339ef2f QW |
3956 | btrfs_queue_work(fs_info->scrub_nocow_workers, |
3957 | &nocow_ctx->work); | |
ff023aac SB |
3958 | |
3959 | return 0; | |
3960 | } | |
3961 | ||
652f25a2 JB |
3962 | static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx) |
3963 | { | |
3964 | struct scrub_copy_nocow_ctx *nocow_ctx = ctx; | |
3965 | struct scrub_nocow_inode *nocow_inode; | |
3966 | ||
3967 | nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS); | |
3968 | if (!nocow_inode) | |
3969 | return -ENOMEM; | |
3970 | nocow_inode->inum = inum; | |
3971 | nocow_inode->offset = offset; | |
3972 | nocow_inode->root = root; | |
3973 | list_add_tail(&nocow_inode->list, &nocow_ctx->inodes); | |
3974 | return 0; | |
3975 | } | |
3976 | ||
3977 | #define COPY_COMPLETE 1 | |
3978 | ||
ff023aac SB |
3979 | static void copy_nocow_pages_worker(struct btrfs_work *work) |
3980 | { | |
3981 | struct scrub_copy_nocow_ctx *nocow_ctx = | |
3982 | container_of(work, struct scrub_copy_nocow_ctx, work); | |
3983 | struct scrub_ctx *sctx = nocow_ctx->sctx; | |
3984 | u64 logical = nocow_ctx->logical; | |
3985 | u64 len = nocow_ctx->len; | |
3986 | int mirror_num = nocow_ctx->mirror_num; | |
3987 | u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; | |
3988 | int ret; | |
3989 | struct btrfs_trans_handle *trans = NULL; | |
3990 | struct btrfs_fs_info *fs_info; | |
3991 | struct btrfs_path *path; | |
3992 | struct btrfs_root *root; | |
3993 | int not_written = 0; | |
3994 | ||
3995 | fs_info = sctx->dev_root->fs_info; | |
3996 | root = fs_info->extent_root; | |
3997 | ||
3998 | path = btrfs_alloc_path(); | |
3999 | if (!path) { | |
4000 | spin_lock(&sctx->stat_lock); | |
4001 | sctx->stat.malloc_errors++; | |
4002 | spin_unlock(&sctx->stat_lock); | |
4003 | not_written = 1; | |
4004 | goto out; | |
4005 | } | |
4006 | ||
4007 | trans = btrfs_join_transaction(root); | |
4008 | if (IS_ERR(trans)) { | |
4009 | not_written = 1; | |
4010 | goto out; | |
4011 | } | |
4012 | ||
4013 | ret = iterate_inodes_from_logical(logical, fs_info, path, | |
652f25a2 | 4014 | record_inode_for_nocow, nocow_ctx); |
ff023aac | 4015 | if (ret != 0 && ret != -ENOENT) { |
efe120a0 FH |
4016 | btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, " |
4017 | "phys %llu, len %llu, mir %u, ret %d", | |
118a0a25 GU |
4018 | logical, physical_for_dev_replace, len, mirror_num, |
4019 | ret); | |
ff023aac SB |
4020 | not_written = 1; |
4021 | goto out; | |
4022 | } | |
4023 | ||
652f25a2 JB |
4024 | btrfs_end_transaction(trans, root); |
4025 | trans = NULL; | |
4026 | while (!list_empty(&nocow_ctx->inodes)) { | |
4027 | struct scrub_nocow_inode *entry; | |
4028 | entry = list_first_entry(&nocow_ctx->inodes, | |
4029 | struct scrub_nocow_inode, | |
4030 | list); | |
4031 | list_del_init(&entry->list); | |
4032 | ret = copy_nocow_pages_for_inode(entry->inum, entry->offset, | |
4033 | entry->root, nocow_ctx); | |
4034 | kfree(entry); | |
4035 | if (ret == COPY_COMPLETE) { | |
4036 | ret = 0; | |
4037 | break; | |
4038 | } else if (ret) { | |
4039 | break; | |
4040 | } | |
4041 | } | |
ff023aac | 4042 | out: |
652f25a2 JB |
4043 | while (!list_empty(&nocow_ctx->inodes)) { |
4044 | struct scrub_nocow_inode *entry; | |
4045 | entry = list_first_entry(&nocow_ctx->inodes, | |
4046 | struct scrub_nocow_inode, | |
4047 | list); | |
4048 | list_del_init(&entry->list); | |
4049 | kfree(entry); | |
4050 | } | |
ff023aac SB |
4051 | if (trans && !IS_ERR(trans)) |
4052 | btrfs_end_transaction(trans, root); | |
4053 | if (not_written) | |
4054 | btrfs_dev_replace_stats_inc(&fs_info->dev_replace. | |
4055 | num_uncorrectable_read_errors); | |
4056 | ||
4057 | btrfs_free_path(path); | |
4058 | kfree(nocow_ctx); | |
4059 | ||
4060 | scrub_pending_trans_workers_dec(sctx); | |
4061 | } | |
4062 | ||
32159242 GH |
4063 | static int check_extent_to_block(struct inode *inode, u64 start, u64 len, |
4064 | u64 logical) | |
4065 | { | |
4066 | struct extent_state *cached_state = NULL; | |
4067 | struct btrfs_ordered_extent *ordered; | |
4068 | struct extent_io_tree *io_tree; | |
4069 | struct extent_map *em; | |
4070 | u64 lockstart = start, lockend = start + len - 1; | |
4071 | int ret = 0; | |
4072 | ||
4073 | io_tree = &BTRFS_I(inode)->io_tree; | |
4074 | ||
4075 | lock_extent_bits(io_tree, lockstart, lockend, 0, &cached_state); | |
4076 | ordered = btrfs_lookup_ordered_range(inode, lockstart, len); | |
4077 | if (ordered) { | |
4078 | btrfs_put_ordered_extent(ordered); | |
4079 | ret = 1; | |
4080 | goto out_unlock; | |
4081 | } | |
4082 | ||
4083 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
4084 | if (IS_ERR(em)) { | |
4085 | ret = PTR_ERR(em); | |
4086 | goto out_unlock; | |
4087 | } | |
4088 | ||
4089 | /* | |
4090 | * This extent does not actually cover the logical extent anymore, | |
4091 | * move on to the next inode. | |
4092 | */ | |
4093 | if (em->block_start > logical || | |
4094 | em->block_start + em->block_len < logical + len) { | |
4095 | free_extent_map(em); | |
4096 | ret = 1; | |
4097 | goto out_unlock; | |
4098 | } | |
4099 | free_extent_map(em); | |
4100 | ||
4101 | out_unlock: | |
4102 | unlock_extent_cached(io_tree, lockstart, lockend, &cached_state, | |
4103 | GFP_NOFS); | |
4104 | return ret; | |
4105 | } | |
4106 | ||
652f25a2 JB |
4107 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, |
4108 | struct scrub_copy_nocow_ctx *nocow_ctx) | |
ff023aac | 4109 | { |
826aa0a8 | 4110 | struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info; |
ff023aac | 4111 | struct btrfs_key key; |
826aa0a8 MX |
4112 | struct inode *inode; |
4113 | struct page *page; | |
ff023aac | 4114 | struct btrfs_root *local_root; |
652f25a2 | 4115 | struct extent_io_tree *io_tree; |
ff023aac | 4116 | u64 physical_for_dev_replace; |
32159242 | 4117 | u64 nocow_ctx_logical; |
652f25a2 | 4118 | u64 len = nocow_ctx->len; |
826aa0a8 | 4119 | unsigned long index; |
6f1c3605 | 4120 | int srcu_index; |
652f25a2 JB |
4121 | int ret = 0; |
4122 | int err = 0; | |
ff023aac SB |
4123 | |
4124 | key.objectid = root; | |
4125 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4126 | key.offset = (u64)-1; | |
6f1c3605 LB |
4127 | |
4128 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
4129 | ||
ff023aac | 4130 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); |
6f1c3605 LB |
4131 | if (IS_ERR(local_root)) { |
4132 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
ff023aac | 4133 | return PTR_ERR(local_root); |
6f1c3605 | 4134 | } |
ff023aac SB |
4135 | |
4136 | key.type = BTRFS_INODE_ITEM_KEY; | |
4137 | key.objectid = inum; | |
4138 | key.offset = 0; | |
4139 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); | |
6f1c3605 | 4140 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
ff023aac SB |
4141 | if (IS_ERR(inode)) |
4142 | return PTR_ERR(inode); | |
4143 | ||
edd1400b MX |
4144 | /* Avoid truncate/dio/punch hole.. */ |
4145 | mutex_lock(&inode->i_mutex); | |
4146 | inode_dio_wait(inode); | |
4147 | ||
ff023aac | 4148 | physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; |
652f25a2 | 4149 | io_tree = &BTRFS_I(inode)->io_tree; |
32159242 | 4150 | nocow_ctx_logical = nocow_ctx->logical; |
652f25a2 | 4151 | |
32159242 GH |
4152 | ret = check_extent_to_block(inode, offset, len, nocow_ctx_logical); |
4153 | if (ret) { | |
4154 | ret = ret > 0 ? 0 : ret; | |
4155 | goto out; | |
652f25a2 | 4156 | } |
652f25a2 | 4157 | |
ff023aac | 4158 | while (len >= PAGE_CACHE_SIZE) { |
ff023aac | 4159 | index = offset >> PAGE_CACHE_SHIFT; |
edd1400b | 4160 | again: |
ff023aac SB |
4161 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
4162 | if (!page) { | |
efe120a0 | 4163 | btrfs_err(fs_info, "find_or_create_page() failed"); |
ff023aac | 4164 | ret = -ENOMEM; |
826aa0a8 | 4165 | goto out; |
ff023aac SB |
4166 | } |
4167 | ||
4168 | if (PageUptodate(page)) { | |
4169 | if (PageDirty(page)) | |
4170 | goto next_page; | |
4171 | } else { | |
4172 | ClearPageError(page); | |
32159242 | 4173 | err = extent_read_full_page(io_tree, page, |
652f25a2 JB |
4174 | btrfs_get_extent, |
4175 | nocow_ctx->mirror_num); | |
826aa0a8 MX |
4176 | if (err) { |
4177 | ret = err; | |
ff023aac SB |
4178 | goto next_page; |
4179 | } | |
edd1400b | 4180 | |
26b25891 | 4181 | lock_page(page); |
edd1400b MX |
4182 | /* |
4183 | * If the page has been remove from the page cache, | |
4184 | * the data on it is meaningless, because it may be | |
4185 | * old one, the new data may be written into the new | |
4186 | * page in the page cache. | |
4187 | */ | |
4188 | if (page->mapping != inode->i_mapping) { | |
652f25a2 | 4189 | unlock_page(page); |
edd1400b MX |
4190 | page_cache_release(page); |
4191 | goto again; | |
4192 | } | |
ff023aac SB |
4193 | if (!PageUptodate(page)) { |
4194 | ret = -EIO; | |
4195 | goto next_page; | |
4196 | } | |
4197 | } | |
32159242 GH |
4198 | |
4199 | ret = check_extent_to_block(inode, offset, len, | |
4200 | nocow_ctx_logical); | |
4201 | if (ret) { | |
4202 | ret = ret > 0 ? 0 : ret; | |
4203 | goto next_page; | |
4204 | } | |
4205 | ||
826aa0a8 MX |
4206 | err = write_page_nocow(nocow_ctx->sctx, |
4207 | physical_for_dev_replace, page); | |
4208 | if (err) | |
4209 | ret = err; | |
ff023aac | 4210 | next_page: |
826aa0a8 MX |
4211 | unlock_page(page); |
4212 | page_cache_release(page); | |
4213 | ||
4214 | if (ret) | |
4215 | break; | |
4216 | ||
ff023aac SB |
4217 | offset += PAGE_CACHE_SIZE; |
4218 | physical_for_dev_replace += PAGE_CACHE_SIZE; | |
32159242 | 4219 | nocow_ctx_logical += PAGE_CACHE_SIZE; |
ff023aac SB |
4220 | len -= PAGE_CACHE_SIZE; |
4221 | } | |
652f25a2 | 4222 | ret = COPY_COMPLETE; |
826aa0a8 | 4223 | out: |
edd1400b | 4224 | mutex_unlock(&inode->i_mutex); |
826aa0a8 | 4225 | iput(inode); |
ff023aac SB |
4226 | return ret; |
4227 | } | |
4228 | ||
4229 | static int write_page_nocow(struct scrub_ctx *sctx, | |
4230 | u64 physical_for_dev_replace, struct page *page) | |
4231 | { | |
4232 | struct bio *bio; | |
4233 | struct btrfs_device *dev; | |
4234 | int ret; | |
ff023aac SB |
4235 | |
4236 | dev = sctx->wr_ctx.tgtdev; | |
4237 | if (!dev) | |
4238 | return -EIO; | |
4239 | if (!dev->bdev) { | |
4240 | printk_ratelimited(KERN_WARNING | |
efe120a0 | 4241 | "BTRFS: scrub write_page_nocow(bdev == NULL) is unexpected!\n"); |
ff023aac SB |
4242 | return -EIO; |
4243 | } | |
9be3395b | 4244 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
ff023aac SB |
4245 | if (!bio) { |
4246 | spin_lock(&sctx->stat_lock); | |
4247 | sctx->stat.malloc_errors++; | |
4248 | spin_unlock(&sctx->stat_lock); | |
4249 | return -ENOMEM; | |
4250 | } | |
4f024f37 KO |
4251 | bio->bi_iter.bi_size = 0; |
4252 | bio->bi_iter.bi_sector = physical_for_dev_replace >> 9; | |
ff023aac SB |
4253 | bio->bi_bdev = dev->bdev; |
4254 | ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); | |
4255 | if (ret != PAGE_CACHE_SIZE) { | |
4256 | leave_with_eio: | |
4257 | bio_put(bio); | |
4258 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); | |
4259 | return -EIO; | |
4260 | } | |
ff023aac | 4261 | |
33879d45 | 4262 | if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) |
ff023aac SB |
4263 | goto leave_with_eio; |
4264 | ||
4265 | bio_put(bio); | |
4266 | return 0; | |
4267 | } |