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 AJ |
65 | |
66 | struct scrub_page { | |
b5d67f64 SB |
67 | struct scrub_block *sblock; |
68 | struct page *page; | |
442a4f63 | 69 | struct btrfs_device *dev; |
a2de733c AJ |
70 | u64 flags; /* extent flags */ |
71 | u64 generation; | |
b5d67f64 SB |
72 | u64 logical; |
73 | u64 physical; | |
ff023aac | 74 | u64 physical_for_dev_replace; |
7a9e9987 | 75 | atomic_t ref_count; |
b5d67f64 SB |
76 | struct { |
77 | unsigned int mirror_num:8; | |
78 | unsigned int have_csum:1; | |
79 | unsigned int io_error:1; | |
80 | }; | |
a2de733c AJ |
81 | u8 csum[BTRFS_CSUM_SIZE]; |
82 | }; | |
83 | ||
84 | struct scrub_bio { | |
85 | int index; | |
d9d181c1 | 86 | struct scrub_ctx *sctx; |
a36cf8b8 | 87 | struct btrfs_device *dev; |
a2de733c AJ |
88 | struct bio *bio; |
89 | int err; | |
90 | u64 logical; | |
91 | u64 physical; | |
ff023aac SB |
92 | #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO |
93 | struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO]; | |
94 | #else | |
95 | struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO]; | |
96 | #endif | |
b5d67f64 | 97 | int page_count; |
a2de733c AJ |
98 | int next_free; |
99 | struct btrfs_work work; | |
100 | }; | |
101 | ||
b5d67f64 | 102 | struct scrub_block { |
7a9e9987 | 103 | struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK]; |
b5d67f64 SB |
104 | int page_count; |
105 | atomic_t outstanding_pages; | |
106 | atomic_t ref_count; /* free mem on transition to zero */ | |
d9d181c1 | 107 | struct scrub_ctx *sctx; |
b5d67f64 SB |
108 | struct { |
109 | unsigned int header_error:1; | |
110 | unsigned int checksum_error:1; | |
111 | unsigned int no_io_error_seen:1; | |
442a4f63 | 112 | unsigned int generation_error:1; /* also sets header_error */ |
b5d67f64 SB |
113 | }; |
114 | }; | |
115 | ||
ff023aac SB |
116 | struct scrub_wr_ctx { |
117 | struct scrub_bio *wr_curr_bio; | |
118 | struct btrfs_device *tgtdev; | |
119 | int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */ | |
120 | atomic_t flush_all_writes; | |
121 | struct mutex wr_lock; | |
122 | }; | |
123 | ||
d9d181c1 | 124 | struct scrub_ctx { |
ff023aac | 125 | struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX]; |
a36cf8b8 | 126 | struct btrfs_root *dev_root; |
a2de733c AJ |
127 | int first_free; |
128 | int curr; | |
b6bfebc1 SB |
129 | atomic_t bios_in_flight; |
130 | atomic_t workers_pending; | |
a2de733c AJ |
131 | spinlock_t list_lock; |
132 | wait_queue_head_t list_wait; | |
133 | u16 csum_size; | |
134 | struct list_head csum_list; | |
135 | atomic_t cancel_req; | |
8628764e | 136 | int readonly; |
ff023aac | 137 | int pages_per_rd_bio; |
b5d67f64 SB |
138 | u32 sectorsize; |
139 | u32 nodesize; | |
63a212ab SB |
140 | |
141 | int is_dev_replace; | |
ff023aac | 142 | struct scrub_wr_ctx wr_ctx; |
63a212ab | 143 | |
a2de733c AJ |
144 | /* |
145 | * statistics | |
146 | */ | |
147 | struct btrfs_scrub_progress stat; | |
148 | spinlock_t stat_lock; | |
149 | }; | |
150 | ||
0ef8e451 | 151 | struct scrub_fixup_nodatasum { |
d9d181c1 | 152 | struct scrub_ctx *sctx; |
a36cf8b8 | 153 | struct btrfs_device *dev; |
0ef8e451 JS |
154 | u64 logical; |
155 | struct btrfs_root *root; | |
156 | struct btrfs_work work; | |
157 | int mirror_num; | |
158 | }; | |
159 | ||
652f25a2 JB |
160 | struct scrub_nocow_inode { |
161 | u64 inum; | |
162 | u64 offset; | |
163 | u64 root; | |
164 | struct list_head list; | |
165 | }; | |
166 | ||
ff023aac SB |
167 | struct scrub_copy_nocow_ctx { |
168 | struct scrub_ctx *sctx; | |
169 | u64 logical; | |
170 | u64 len; | |
171 | int mirror_num; | |
172 | u64 physical_for_dev_replace; | |
652f25a2 | 173 | struct list_head inodes; |
ff023aac SB |
174 | struct btrfs_work work; |
175 | }; | |
176 | ||
558540c1 JS |
177 | struct scrub_warning { |
178 | struct btrfs_path *path; | |
179 | u64 extent_item_size; | |
180 | char *scratch_buf; | |
181 | char *msg_buf; | |
182 | const char *errstr; | |
183 | sector_t sector; | |
184 | u64 logical; | |
185 | struct btrfs_device *dev; | |
186 | int msg_bufsize; | |
187 | int scratch_bufsize; | |
188 | }; | |
189 | ||
b5d67f64 | 190 | |
b6bfebc1 SB |
191 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx); |
192 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx); | |
193 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx); | |
194 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx); | |
b5d67f64 | 195 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check); |
d9d181c1 | 196 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
3ec706c8 | 197 | struct btrfs_fs_info *fs_info, |
ff023aac | 198 | struct scrub_block *original_sblock, |
b5d67f64 | 199 | u64 length, u64 logical, |
ff023aac | 200 | struct scrub_block *sblocks_for_recheck); |
34f5c8e9 SB |
201 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
202 | struct scrub_block *sblock, int is_metadata, | |
203 | int have_csum, u8 *csum, u64 generation, | |
204 | u16 csum_size); | |
b5d67f64 SB |
205 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
206 | struct scrub_block *sblock, | |
207 | int is_metadata, int have_csum, | |
208 | const u8 *csum, u64 generation, | |
209 | u16 csum_size); | |
b5d67f64 SB |
210 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
211 | struct scrub_block *sblock_good, | |
212 | int force_write); | |
213 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
214 | struct scrub_block *sblock_good, | |
215 | int page_num, int force_write); | |
ff023aac SB |
216 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock); |
217 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
218 | int page_num); | |
b5d67f64 SB |
219 | static int scrub_checksum_data(struct scrub_block *sblock); |
220 | static int scrub_checksum_tree_block(struct scrub_block *sblock); | |
221 | static int scrub_checksum_super(struct scrub_block *sblock); | |
222 | static void scrub_block_get(struct scrub_block *sblock); | |
223 | static void scrub_block_put(struct scrub_block *sblock); | |
7a9e9987 SB |
224 | static void scrub_page_get(struct scrub_page *spage); |
225 | static void scrub_page_put(struct scrub_page *spage); | |
ff023aac SB |
226 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
227 | struct scrub_page *spage); | |
d9d181c1 | 228 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 229 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
230 | u64 gen, int mirror_num, u8 *csum, int force, |
231 | u64 physical_for_dev_replace); | |
1623edeb | 232 | static void scrub_bio_end_io(struct bio *bio, int err); |
b5d67f64 SB |
233 | static void scrub_bio_end_io_worker(struct btrfs_work *work); |
234 | static void scrub_block_complete(struct scrub_block *sblock); | |
ff023aac SB |
235 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, |
236 | u64 extent_logical, u64 extent_len, | |
237 | u64 *extent_physical, | |
238 | struct btrfs_device **extent_dev, | |
239 | int *extent_mirror_num); | |
240 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
241 | struct scrub_wr_ctx *wr_ctx, | |
242 | struct btrfs_fs_info *fs_info, | |
243 | struct btrfs_device *dev, | |
244 | int is_dev_replace); | |
245 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx); | |
246 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
247 | struct scrub_page *spage); | |
248 | static void scrub_wr_submit(struct scrub_ctx *sctx); | |
249 | static void scrub_wr_bio_end_io(struct bio *bio, int err); | |
250 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work); | |
251 | static int write_page_nocow(struct scrub_ctx *sctx, | |
252 | u64 physical_for_dev_replace, struct page *page); | |
253 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, | |
652f25a2 | 254 | struct scrub_copy_nocow_ctx *ctx); |
ff023aac SB |
255 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
256 | int mirror_num, u64 physical_for_dev_replace); | |
257 | static void copy_nocow_pages_worker(struct btrfs_work *work); | |
cb7ab021 | 258 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
3cb0929a | 259 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
1623edeb SB |
260 | |
261 | ||
b6bfebc1 SB |
262 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx) |
263 | { | |
264 | atomic_inc(&sctx->bios_in_flight); | |
265 | } | |
266 | ||
267 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx) | |
268 | { | |
269 | atomic_dec(&sctx->bios_in_flight); | |
270 | wake_up(&sctx->list_wait); | |
271 | } | |
272 | ||
cb7ab021 | 273 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
3cb0929a WS |
274 | { |
275 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
276 | mutex_unlock(&fs_info->scrub_lock); | |
277 | wait_event(fs_info->scrub_pause_wait, | |
278 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
279 | mutex_lock(&fs_info->scrub_lock); | |
280 | } | |
281 | } | |
282 | ||
cb7ab021 WS |
283 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
284 | { | |
285 | atomic_inc(&fs_info->scrubs_paused); | |
286 | wake_up(&fs_info->scrub_pause_wait); | |
287 | ||
288 | mutex_lock(&fs_info->scrub_lock); | |
289 | __scrub_blocked_if_needed(fs_info); | |
290 | atomic_dec(&fs_info->scrubs_paused); | |
291 | mutex_unlock(&fs_info->scrub_lock); | |
292 | ||
293 | wake_up(&fs_info->scrub_pause_wait); | |
294 | } | |
295 | ||
b6bfebc1 SB |
296 | /* |
297 | * used for workers that require transaction commits (i.e., for the | |
298 | * NOCOW case) | |
299 | */ | |
300 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx) | |
301 | { | |
302 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
303 | ||
304 | /* | |
305 | * increment scrubs_running to prevent cancel requests from | |
306 | * completing as long as a worker is running. we must also | |
307 | * increment scrubs_paused to prevent deadlocking on pause | |
308 | * requests used for transactions commits (as the worker uses a | |
309 | * transaction context). it is safe to regard the worker | |
310 | * as paused for all matters practical. effectively, we only | |
311 | * avoid cancellation requests from completing. | |
312 | */ | |
313 | mutex_lock(&fs_info->scrub_lock); | |
314 | atomic_inc(&fs_info->scrubs_running); | |
315 | atomic_inc(&fs_info->scrubs_paused); | |
316 | mutex_unlock(&fs_info->scrub_lock); | |
32a44789 WS |
317 | |
318 | /* | |
319 | * check if @scrubs_running=@scrubs_paused condition | |
320 | * inside wait_event() is not an atomic operation. | |
321 | * which means we may inc/dec @scrub_running/paused | |
322 | * at any time. Let's wake up @scrub_pause_wait as | |
323 | * much as we can to let commit transaction blocked less. | |
324 | */ | |
325 | wake_up(&fs_info->scrub_pause_wait); | |
326 | ||
b6bfebc1 SB |
327 | atomic_inc(&sctx->workers_pending); |
328 | } | |
329 | ||
330 | /* used for workers that require transaction commits */ | |
331 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx) | |
332 | { | |
333 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
334 | ||
335 | /* | |
336 | * see scrub_pending_trans_workers_inc() why we're pretending | |
337 | * to be paused in the scrub counters | |
338 | */ | |
339 | mutex_lock(&fs_info->scrub_lock); | |
340 | atomic_dec(&fs_info->scrubs_running); | |
341 | atomic_dec(&fs_info->scrubs_paused); | |
342 | mutex_unlock(&fs_info->scrub_lock); | |
343 | atomic_dec(&sctx->workers_pending); | |
344 | wake_up(&fs_info->scrub_pause_wait); | |
345 | wake_up(&sctx->list_wait); | |
346 | } | |
347 | ||
d9d181c1 | 348 | static void scrub_free_csums(struct scrub_ctx *sctx) |
a2de733c | 349 | { |
d9d181c1 | 350 | while (!list_empty(&sctx->csum_list)) { |
a2de733c | 351 | struct btrfs_ordered_sum *sum; |
d9d181c1 | 352 | sum = list_first_entry(&sctx->csum_list, |
a2de733c AJ |
353 | struct btrfs_ordered_sum, list); |
354 | list_del(&sum->list); | |
355 | kfree(sum); | |
356 | } | |
357 | } | |
358 | ||
d9d181c1 | 359 | static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) |
a2de733c AJ |
360 | { |
361 | int i; | |
a2de733c | 362 | |
d9d181c1 | 363 | if (!sctx) |
a2de733c AJ |
364 | return; |
365 | ||
ff023aac SB |
366 | scrub_free_wr_ctx(&sctx->wr_ctx); |
367 | ||
b5d67f64 | 368 | /* this can happen when scrub is cancelled */ |
d9d181c1 SB |
369 | if (sctx->curr != -1) { |
370 | struct scrub_bio *sbio = sctx->bios[sctx->curr]; | |
b5d67f64 SB |
371 | |
372 | for (i = 0; i < sbio->page_count; i++) { | |
ff023aac | 373 | WARN_ON(!sbio->pagev[i]->page); |
b5d67f64 SB |
374 | scrub_block_put(sbio->pagev[i]->sblock); |
375 | } | |
376 | bio_put(sbio->bio); | |
377 | } | |
378 | ||
ff023aac | 379 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
d9d181c1 | 380 | struct scrub_bio *sbio = sctx->bios[i]; |
a2de733c AJ |
381 | |
382 | if (!sbio) | |
383 | break; | |
a2de733c AJ |
384 | kfree(sbio); |
385 | } | |
386 | ||
d9d181c1 SB |
387 | scrub_free_csums(sctx); |
388 | kfree(sctx); | |
a2de733c AJ |
389 | } |
390 | ||
391 | static noinline_for_stack | |
63a212ab | 392 | struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace) |
a2de733c | 393 | { |
d9d181c1 | 394 | struct scrub_ctx *sctx; |
a2de733c | 395 | int i; |
a2de733c | 396 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
ff023aac SB |
397 | int pages_per_rd_bio; |
398 | int ret; | |
a2de733c | 399 | |
ff023aac SB |
400 | /* |
401 | * the setting of pages_per_rd_bio is correct for scrub but might | |
402 | * be wrong for the dev_replace code where we might read from | |
403 | * different devices in the initial huge bios. However, that | |
404 | * code is able to correctly handle the case when adding a page | |
405 | * to a bio fails. | |
406 | */ | |
407 | if (dev->bdev) | |
408 | pages_per_rd_bio = min_t(int, SCRUB_PAGES_PER_RD_BIO, | |
409 | bio_get_nr_vecs(dev->bdev)); | |
410 | else | |
411 | pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; | |
d9d181c1 SB |
412 | sctx = kzalloc(sizeof(*sctx), GFP_NOFS); |
413 | if (!sctx) | |
a2de733c | 414 | goto nomem; |
63a212ab | 415 | sctx->is_dev_replace = is_dev_replace; |
ff023aac | 416 | sctx->pages_per_rd_bio = pages_per_rd_bio; |
d9d181c1 | 417 | sctx->curr = -1; |
a36cf8b8 | 418 | sctx->dev_root = dev->dev_root; |
ff023aac | 419 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
a2de733c AJ |
420 | struct scrub_bio *sbio; |
421 | ||
422 | sbio = kzalloc(sizeof(*sbio), GFP_NOFS); | |
423 | if (!sbio) | |
424 | goto nomem; | |
d9d181c1 | 425 | sctx->bios[i] = sbio; |
a2de733c | 426 | |
a2de733c | 427 | sbio->index = i; |
d9d181c1 | 428 | sbio->sctx = sctx; |
b5d67f64 | 429 | sbio->page_count = 0; |
9e0af237 LB |
430 | btrfs_init_work(&sbio->work, btrfs_scrub_helper, |
431 | scrub_bio_end_io_worker, NULL, NULL); | |
a2de733c | 432 | |
ff023aac | 433 | if (i != SCRUB_BIOS_PER_SCTX - 1) |
d9d181c1 | 434 | sctx->bios[i]->next_free = i + 1; |
0ef8e451 | 435 | else |
d9d181c1 SB |
436 | sctx->bios[i]->next_free = -1; |
437 | } | |
438 | sctx->first_free = 0; | |
439 | sctx->nodesize = dev->dev_root->nodesize; | |
d9d181c1 | 440 | sctx->sectorsize = dev->dev_root->sectorsize; |
b6bfebc1 SB |
441 | atomic_set(&sctx->bios_in_flight, 0); |
442 | atomic_set(&sctx->workers_pending, 0); | |
d9d181c1 SB |
443 | atomic_set(&sctx->cancel_req, 0); |
444 | sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
445 | INIT_LIST_HEAD(&sctx->csum_list); | |
446 | ||
447 | spin_lock_init(&sctx->list_lock); | |
448 | spin_lock_init(&sctx->stat_lock); | |
449 | init_waitqueue_head(&sctx->list_wait); | |
ff023aac SB |
450 | |
451 | ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info, | |
452 | fs_info->dev_replace.tgtdev, is_dev_replace); | |
453 | if (ret) { | |
454 | scrub_free_ctx(sctx); | |
455 | return ERR_PTR(ret); | |
456 | } | |
d9d181c1 | 457 | return sctx; |
a2de733c AJ |
458 | |
459 | nomem: | |
d9d181c1 | 460 | scrub_free_ctx(sctx); |
a2de733c AJ |
461 | return ERR_PTR(-ENOMEM); |
462 | } | |
463 | ||
ff023aac SB |
464 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, |
465 | void *warn_ctx) | |
558540c1 JS |
466 | { |
467 | u64 isize; | |
468 | u32 nlink; | |
469 | int ret; | |
470 | int i; | |
471 | struct extent_buffer *eb; | |
472 | struct btrfs_inode_item *inode_item; | |
ff023aac | 473 | struct scrub_warning *swarn = warn_ctx; |
558540c1 JS |
474 | struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; |
475 | struct inode_fs_paths *ipath = NULL; | |
476 | struct btrfs_root *local_root; | |
477 | struct btrfs_key root_key; | |
478 | ||
479 | root_key.objectid = root; | |
480 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
481 | root_key.offset = (u64)-1; | |
482 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
483 | if (IS_ERR(local_root)) { | |
484 | ret = PTR_ERR(local_root); | |
485 | goto err; | |
486 | } | |
487 | ||
488 | ret = inode_item_info(inum, 0, local_root, swarn->path); | |
489 | if (ret) { | |
490 | btrfs_release_path(swarn->path); | |
491 | goto err; | |
492 | } | |
493 | ||
494 | eb = swarn->path->nodes[0]; | |
495 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], | |
496 | struct btrfs_inode_item); | |
497 | isize = btrfs_inode_size(eb, inode_item); | |
498 | nlink = btrfs_inode_nlink(eb, inode_item); | |
499 | btrfs_release_path(swarn->path); | |
500 | ||
501 | ipath = init_ipath(4096, local_root, swarn->path); | |
26bdef54 DC |
502 | if (IS_ERR(ipath)) { |
503 | ret = PTR_ERR(ipath); | |
504 | ipath = NULL; | |
505 | goto err; | |
506 | } | |
558540c1 JS |
507 | ret = paths_from_inode(inum, ipath); |
508 | ||
509 | if (ret < 0) | |
510 | goto err; | |
511 | ||
512 | /* | |
513 | * we deliberately ignore the bit ipath might have been too small to | |
514 | * hold all of the paths here | |
515 | */ | |
516 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) | |
efe120a0 | 517 | printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev " |
558540c1 JS |
518 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " |
519 | "length %llu, links %u (path: %s)\n", swarn->errstr, | |
606686ee | 520 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
521 | (unsigned long long)swarn->sector, root, inum, offset, |
522 | min(isize - offset, (u64)PAGE_SIZE), nlink, | |
745c4d8e | 523 | (char *)(unsigned long)ipath->fspath->val[i]); |
558540c1 JS |
524 | |
525 | free_ipath(ipath); | |
526 | return 0; | |
527 | ||
528 | err: | |
efe120a0 | 529 | printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev " |
558540c1 JS |
530 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " |
531 | "resolving failed with ret=%d\n", swarn->errstr, | |
606686ee | 532 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
533 | (unsigned long long)swarn->sector, root, inum, offset, ret); |
534 | ||
535 | free_ipath(ipath); | |
536 | return 0; | |
537 | } | |
538 | ||
b5d67f64 | 539 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
558540c1 | 540 | { |
a36cf8b8 SB |
541 | struct btrfs_device *dev; |
542 | struct btrfs_fs_info *fs_info; | |
558540c1 JS |
543 | struct btrfs_path *path; |
544 | struct btrfs_key found_key; | |
545 | struct extent_buffer *eb; | |
546 | struct btrfs_extent_item *ei; | |
547 | struct scrub_warning swarn; | |
69917e43 LB |
548 | unsigned long ptr = 0; |
549 | u64 extent_item_pos; | |
550 | u64 flags = 0; | |
558540c1 | 551 | u64 ref_root; |
69917e43 | 552 | u32 item_size; |
558540c1 | 553 | u8 ref_level; |
558540c1 | 554 | const int bufsize = 4096; |
69917e43 | 555 | int ret; |
558540c1 | 556 | |
a36cf8b8 | 557 | WARN_ON(sblock->page_count < 1); |
7a9e9987 | 558 | dev = sblock->pagev[0]->dev; |
a36cf8b8 SB |
559 | fs_info = sblock->sctx->dev_root->fs_info; |
560 | ||
558540c1 JS |
561 | path = btrfs_alloc_path(); |
562 | ||
563 | swarn.scratch_buf = kmalloc(bufsize, GFP_NOFS); | |
564 | swarn.msg_buf = kmalloc(bufsize, GFP_NOFS); | |
7a9e9987 SB |
565 | swarn.sector = (sblock->pagev[0]->physical) >> 9; |
566 | swarn.logical = sblock->pagev[0]->logical; | |
558540c1 | 567 | swarn.errstr = errstr; |
a36cf8b8 | 568 | swarn.dev = NULL; |
558540c1 JS |
569 | swarn.msg_bufsize = bufsize; |
570 | swarn.scratch_bufsize = bufsize; | |
571 | ||
572 | if (!path || !swarn.scratch_buf || !swarn.msg_buf) | |
573 | goto out; | |
574 | ||
69917e43 LB |
575 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, |
576 | &flags); | |
558540c1 JS |
577 | if (ret < 0) |
578 | goto out; | |
579 | ||
4692cf58 | 580 | extent_item_pos = swarn.logical - found_key.objectid; |
558540c1 JS |
581 | swarn.extent_item_size = found_key.offset; |
582 | ||
583 | eb = path->nodes[0]; | |
584 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); | |
585 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
586 | ||
69917e43 | 587 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
558540c1 | 588 | do { |
6eda71d0 LB |
589 | ret = tree_backref_for_extent(&ptr, eb, &found_key, ei, |
590 | item_size, &ref_root, | |
591 | &ref_level); | |
606686ee | 592 | printk_in_rcu(KERN_WARNING |
efe120a0 | 593 | "BTRFS: %s at logical %llu on dev %s, " |
558540c1 | 594 | "sector %llu: metadata %s (level %d) in tree " |
606686ee JB |
595 | "%llu\n", errstr, swarn.logical, |
596 | rcu_str_deref(dev->name), | |
558540c1 JS |
597 | (unsigned long long)swarn.sector, |
598 | ref_level ? "node" : "leaf", | |
599 | ret < 0 ? -1 : ref_level, | |
600 | ret < 0 ? -1 : ref_root); | |
601 | } while (ret != 1); | |
d8fe29e9 | 602 | btrfs_release_path(path); |
558540c1 | 603 | } else { |
d8fe29e9 | 604 | btrfs_release_path(path); |
558540c1 | 605 | swarn.path = path; |
a36cf8b8 | 606 | swarn.dev = dev; |
7a3ae2f8 JS |
607 | iterate_extent_inodes(fs_info, found_key.objectid, |
608 | extent_item_pos, 1, | |
558540c1 JS |
609 | scrub_print_warning_inode, &swarn); |
610 | } | |
611 | ||
612 | out: | |
613 | btrfs_free_path(path); | |
614 | kfree(swarn.scratch_buf); | |
615 | kfree(swarn.msg_buf); | |
616 | } | |
617 | ||
ff023aac | 618 | static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx) |
0ef8e451 | 619 | { |
5da6fcbc | 620 | struct page *page = NULL; |
0ef8e451 | 621 | unsigned long index; |
ff023aac | 622 | struct scrub_fixup_nodatasum *fixup = fixup_ctx; |
0ef8e451 | 623 | int ret; |
5da6fcbc | 624 | int corrected = 0; |
0ef8e451 | 625 | struct btrfs_key key; |
5da6fcbc | 626 | struct inode *inode = NULL; |
6f1c3605 | 627 | struct btrfs_fs_info *fs_info; |
0ef8e451 JS |
628 | u64 end = offset + PAGE_SIZE - 1; |
629 | struct btrfs_root *local_root; | |
6f1c3605 | 630 | int srcu_index; |
0ef8e451 JS |
631 | |
632 | key.objectid = root; | |
633 | key.type = BTRFS_ROOT_ITEM_KEY; | |
634 | key.offset = (u64)-1; | |
6f1c3605 LB |
635 | |
636 | fs_info = fixup->root->fs_info; | |
637 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
638 | ||
639 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
640 | if (IS_ERR(local_root)) { | |
641 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 | 642 | return PTR_ERR(local_root); |
6f1c3605 | 643 | } |
0ef8e451 JS |
644 | |
645 | key.type = BTRFS_INODE_ITEM_KEY; | |
646 | key.objectid = inum; | |
647 | key.offset = 0; | |
6f1c3605 LB |
648 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); |
649 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 JS |
650 | if (IS_ERR(inode)) |
651 | return PTR_ERR(inode); | |
652 | ||
0ef8e451 JS |
653 | index = offset >> PAGE_CACHE_SHIFT; |
654 | ||
655 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
5da6fcbc JS |
656 | if (!page) { |
657 | ret = -ENOMEM; | |
658 | goto out; | |
659 | } | |
660 | ||
661 | if (PageUptodate(page)) { | |
5da6fcbc JS |
662 | if (PageDirty(page)) { |
663 | /* | |
664 | * we need to write the data to the defect sector. the | |
665 | * data that was in that sector is not in memory, | |
666 | * because the page was modified. we must not write the | |
667 | * modified page to that sector. | |
668 | * | |
669 | * TODO: what could be done here: wait for the delalloc | |
670 | * runner to write out that page (might involve | |
671 | * COW) and see whether the sector is still | |
672 | * referenced afterwards. | |
673 | * | |
674 | * For the meantime, we'll treat this error | |
675 | * incorrectable, although there is a chance that a | |
676 | * later scrub will find the bad sector again and that | |
677 | * there's no dirty page in memory, then. | |
678 | */ | |
679 | ret = -EIO; | |
680 | goto out; | |
681 | } | |
1203b681 | 682 | ret = repair_io_failure(inode, offset, PAGE_SIZE, |
5da6fcbc | 683 | fixup->logical, page, |
ffdd2018 | 684 | offset - page_offset(page), |
5da6fcbc JS |
685 | fixup->mirror_num); |
686 | unlock_page(page); | |
687 | corrected = !ret; | |
688 | } else { | |
689 | /* | |
690 | * we need to get good data first. the general readpage path | |
691 | * will call repair_io_failure for us, we just have to make | |
692 | * sure we read the bad mirror. | |
693 | */ | |
694 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
695 | EXTENT_DAMAGED, GFP_NOFS); | |
696 | if (ret) { | |
697 | /* set_extent_bits should give proper error */ | |
698 | WARN_ON(ret > 0); | |
699 | if (ret > 0) | |
700 | ret = -EFAULT; | |
701 | goto out; | |
702 | } | |
703 | ||
704 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, | |
705 | btrfs_get_extent, | |
706 | fixup->mirror_num); | |
707 | wait_on_page_locked(page); | |
708 | ||
709 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, | |
710 | end, EXTENT_DAMAGED, 0, NULL); | |
711 | if (!corrected) | |
712 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
713 | EXTENT_DAMAGED, GFP_NOFS); | |
714 | } | |
715 | ||
716 | out: | |
717 | if (page) | |
718 | put_page(page); | |
7fb18a06 TK |
719 | |
720 | iput(inode); | |
0ef8e451 JS |
721 | |
722 | if (ret < 0) | |
723 | return ret; | |
724 | ||
725 | if (ret == 0 && corrected) { | |
726 | /* | |
727 | * we only need to call readpage for one of the inodes belonging | |
728 | * to this extent. so make iterate_extent_inodes stop | |
729 | */ | |
730 | return 1; | |
731 | } | |
732 | ||
733 | return -EIO; | |
734 | } | |
735 | ||
736 | static void scrub_fixup_nodatasum(struct btrfs_work *work) | |
737 | { | |
738 | int ret; | |
739 | struct scrub_fixup_nodatasum *fixup; | |
d9d181c1 | 740 | struct scrub_ctx *sctx; |
0ef8e451 | 741 | struct btrfs_trans_handle *trans = NULL; |
0ef8e451 JS |
742 | struct btrfs_path *path; |
743 | int uncorrectable = 0; | |
744 | ||
745 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); | |
d9d181c1 | 746 | sctx = fixup->sctx; |
0ef8e451 JS |
747 | |
748 | path = btrfs_alloc_path(); | |
749 | if (!path) { | |
d9d181c1 SB |
750 | spin_lock(&sctx->stat_lock); |
751 | ++sctx->stat.malloc_errors; | |
752 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
753 | uncorrectable = 1; |
754 | goto out; | |
755 | } | |
756 | ||
757 | trans = btrfs_join_transaction(fixup->root); | |
758 | if (IS_ERR(trans)) { | |
759 | uncorrectable = 1; | |
760 | goto out; | |
761 | } | |
762 | ||
763 | /* | |
764 | * the idea is to trigger a regular read through the standard path. we | |
765 | * read a page from the (failed) logical address by specifying the | |
766 | * corresponding copynum of the failed sector. thus, that readpage is | |
767 | * expected to fail. | |
768 | * that is the point where on-the-fly error correction will kick in | |
769 | * (once it's finished) and rewrite the failed sector if a good copy | |
770 | * can be found. | |
771 | */ | |
772 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, | |
773 | path, scrub_fixup_readpage, | |
774 | fixup); | |
775 | if (ret < 0) { | |
776 | uncorrectable = 1; | |
777 | goto out; | |
778 | } | |
779 | WARN_ON(ret != 1); | |
780 | ||
d9d181c1 SB |
781 | spin_lock(&sctx->stat_lock); |
782 | ++sctx->stat.corrected_errors; | |
783 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
784 | |
785 | out: | |
786 | if (trans && !IS_ERR(trans)) | |
787 | btrfs_end_transaction(trans, fixup->root); | |
788 | if (uncorrectable) { | |
d9d181c1 SB |
789 | spin_lock(&sctx->stat_lock); |
790 | ++sctx->stat.uncorrectable_errors; | |
791 | spin_unlock(&sctx->stat_lock); | |
ff023aac SB |
792 | btrfs_dev_replace_stats_inc( |
793 | &sctx->dev_root->fs_info->dev_replace. | |
794 | num_uncorrectable_read_errors); | |
efe120a0 FH |
795 | printk_ratelimited_in_rcu(KERN_ERR "BTRFS: " |
796 | "unable to fixup (nodatasum) error at logical %llu on dev %s\n", | |
c1c9ff7c | 797 | fixup->logical, rcu_str_deref(fixup->dev->name)); |
0ef8e451 JS |
798 | } |
799 | ||
800 | btrfs_free_path(path); | |
801 | kfree(fixup); | |
802 | ||
b6bfebc1 | 803 | scrub_pending_trans_workers_dec(sctx); |
0ef8e451 JS |
804 | } |
805 | ||
a2de733c | 806 | /* |
b5d67f64 SB |
807 | * scrub_handle_errored_block gets called when either verification of the |
808 | * pages failed or the bio failed to read, e.g. with EIO. In the latter | |
809 | * case, this function handles all pages in the bio, even though only one | |
810 | * may be bad. | |
811 | * The goal of this function is to repair the errored block by using the | |
812 | * contents of one of the mirrors. | |
a2de733c | 813 | */ |
b5d67f64 | 814 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
a2de733c | 815 | { |
d9d181c1 | 816 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
a36cf8b8 | 817 | struct btrfs_device *dev; |
b5d67f64 SB |
818 | struct btrfs_fs_info *fs_info; |
819 | u64 length; | |
820 | u64 logical; | |
821 | u64 generation; | |
822 | unsigned int failed_mirror_index; | |
823 | unsigned int is_metadata; | |
824 | unsigned int have_csum; | |
825 | u8 *csum; | |
826 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ | |
827 | struct scrub_block *sblock_bad; | |
828 | int ret; | |
829 | int mirror_index; | |
830 | int page_num; | |
831 | int success; | |
558540c1 | 832 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
b5d67f64 SB |
833 | DEFAULT_RATELIMIT_BURST); |
834 | ||
835 | BUG_ON(sblock_to_check->page_count < 1); | |
a36cf8b8 | 836 | fs_info = sctx->dev_root->fs_info; |
4ded4f63 SB |
837 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
838 | /* | |
839 | * if we find an error in a super block, we just report it. | |
840 | * They will get written with the next transaction commit | |
841 | * anyway | |
842 | */ | |
843 | spin_lock(&sctx->stat_lock); | |
844 | ++sctx->stat.super_errors; | |
845 | spin_unlock(&sctx->stat_lock); | |
846 | return 0; | |
847 | } | |
b5d67f64 | 848 | length = sblock_to_check->page_count * PAGE_SIZE; |
7a9e9987 SB |
849 | logical = sblock_to_check->pagev[0]->logical; |
850 | generation = sblock_to_check->pagev[0]->generation; | |
851 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); | |
852 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; | |
853 | is_metadata = !(sblock_to_check->pagev[0]->flags & | |
b5d67f64 | 854 | BTRFS_EXTENT_FLAG_DATA); |
7a9e9987 SB |
855 | have_csum = sblock_to_check->pagev[0]->have_csum; |
856 | csum = sblock_to_check->pagev[0]->csum; | |
857 | dev = sblock_to_check->pagev[0]->dev; | |
13db62b7 | 858 | |
ff023aac SB |
859 | if (sctx->is_dev_replace && !is_metadata && !have_csum) { |
860 | sblocks_for_recheck = NULL; | |
861 | goto nodatasum_case; | |
862 | } | |
863 | ||
b5d67f64 SB |
864 | /* |
865 | * read all mirrors one after the other. This includes to | |
866 | * re-read the extent or metadata block that failed (that was | |
867 | * the cause that this fixup code is called) another time, | |
868 | * page by page this time in order to know which pages | |
869 | * caused I/O errors and which ones are good (for all mirrors). | |
870 | * It is the goal to handle the situation when more than one | |
871 | * mirror contains I/O errors, but the errors do not | |
872 | * overlap, i.e. the data can be repaired by selecting the | |
873 | * pages from those mirrors without I/O error on the | |
874 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) | |
875 | * would be that mirror #1 has an I/O error on the first page, | |
876 | * the second page is good, and mirror #2 has an I/O error on | |
877 | * the second page, but the first page is good. | |
878 | * Then the first page of the first mirror can be repaired by | |
879 | * taking the first page of the second mirror, and the | |
880 | * second page of the second mirror can be repaired by | |
881 | * copying the contents of the 2nd page of the 1st mirror. | |
882 | * One more note: if the pages of one mirror contain I/O | |
883 | * errors, the checksum cannot be verified. In order to get | |
884 | * the best data for repairing, the first attempt is to find | |
885 | * a mirror without I/O errors and with a validated checksum. | |
886 | * Only if this is not possible, the pages are picked from | |
887 | * mirrors with I/O errors without considering the checksum. | |
888 | * If the latter is the case, at the end, the checksum of the | |
889 | * repaired area is verified in order to correctly maintain | |
890 | * the statistics. | |
891 | */ | |
892 | ||
893 | sblocks_for_recheck = kzalloc(BTRFS_MAX_MIRRORS * | |
894 | sizeof(*sblocks_for_recheck), | |
895 | GFP_NOFS); | |
896 | if (!sblocks_for_recheck) { | |
d9d181c1 SB |
897 | spin_lock(&sctx->stat_lock); |
898 | sctx->stat.malloc_errors++; | |
899 | sctx->stat.read_errors++; | |
900 | sctx->stat.uncorrectable_errors++; | |
901 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 902 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 903 | goto out; |
a2de733c AJ |
904 | } |
905 | ||
b5d67f64 | 906 | /* setup the context, map the logical blocks and alloc the pages */ |
ff023aac | 907 | ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length, |
b5d67f64 SB |
908 | logical, sblocks_for_recheck); |
909 | if (ret) { | |
d9d181c1 SB |
910 | spin_lock(&sctx->stat_lock); |
911 | sctx->stat.read_errors++; | |
912 | sctx->stat.uncorrectable_errors++; | |
913 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 914 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 SB |
915 | goto out; |
916 | } | |
917 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); | |
918 | sblock_bad = sblocks_for_recheck + failed_mirror_index; | |
13db62b7 | 919 | |
b5d67f64 | 920 | /* build and submit the bios for the failed mirror, check checksums */ |
34f5c8e9 SB |
921 | scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum, |
922 | csum, generation, sctx->csum_size); | |
a2de733c | 923 | |
b5d67f64 SB |
924 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
925 | sblock_bad->no_io_error_seen) { | |
926 | /* | |
927 | * the error disappeared after reading page by page, or | |
928 | * the area was part of a huge bio and other parts of the | |
929 | * bio caused I/O errors, or the block layer merged several | |
930 | * read requests into one and the error is caused by a | |
931 | * different bio (usually one of the two latter cases is | |
932 | * the cause) | |
933 | */ | |
d9d181c1 SB |
934 | spin_lock(&sctx->stat_lock); |
935 | sctx->stat.unverified_errors++; | |
936 | spin_unlock(&sctx->stat_lock); | |
a2de733c | 937 | |
ff023aac SB |
938 | if (sctx->is_dev_replace) |
939 | scrub_write_block_to_dev_replace(sblock_bad); | |
b5d67f64 | 940 | goto out; |
a2de733c | 941 | } |
a2de733c | 942 | |
b5d67f64 | 943 | if (!sblock_bad->no_io_error_seen) { |
d9d181c1 SB |
944 | spin_lock(&sctx->stat_lock); |
945 | sctx->stat.read_errors++; | |
946 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
947 | if (__ratelimit(&_rs)) |
948 | scrub_print_warning("i/o error", sblock_to_check); | |
a36cf8b8 | 949 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 950 | } else if (sblock_bad->checksum_error) { |
d9d181c1 SB |
951 | spin_lock(&sctx->stat_lock); |
952 | sctx->stat.csum_errors++; | |
953 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
954 | if (__ratelimit(&_rs)) |
955 | scrub_print_warning("checksum error", sblock_to_check); | |
a36cf8b8 | 956 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 957 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 958 | } else if (sblock_bad->header_error) { |
d9d181c1 SB |
959 | spin_lock(&sctx->stat_lock); |
960 | sctx->stat.verify_errors++; | |
961 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
962 | if (__ratelimit(&_rs)) |
963 | scrub_print_warning("checksum/header error", | |
964 | sblock_to_check); | |
442a4f63 | 965 | if (sblock_bad->generation_error) |
a36cf8b8 | 966 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 SB |
967 | BTRFS_DEV_STAT_GENERATION_ERRS); |
968 | else | |
a36cf8b8 | 969 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 970 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 971 | } |
a2de733c | 972 | |
33ef30ad ID |
973 | if (sctx->readonly) { |
974 | ASSERT(!sctx->is_dev_replace); | |
975 | goto out; | |
976 | } | |
a2de733c | 977 | |
b5d67f64 SB |
978 | if (!is_metadata && !have_csum) { |
979 | struct scrub_fixup_nodatasum *fixup_nodatasum; | |
a2de733c | 980 | |
ff023aac SB |
981 | nodatasum_case: |
982 | WARN_ON(sctx->is_dev_replace); | |
983 | ||
b5d67f64 SB |
984 | /* |
985 | * !is_metadata and !have_csum, this means that the data | |
986 | * might not be COW'ed, that it might be modified | |
987 | * concurrently. The general strategy to work on the | |
988 | * commit root does not help in the case when COW is not | |
989 | * used. | |
990 | */ | |
991 | fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS); | |
992 | if (!fixup_nodatasum) | |
993 | goto did_not_correct_error; | |
d9d181c1 | 994 | fixup_nodatasum->sctx = sctx; |
a36cf8b8 | 995 | fixup_nodatasum->dev = dev; |
b5d67f64 SB |
996 | fixup_nodatasum->logical = logical; |
997 | fixup_nodatasum->root = fs_info->extent_root; | |
998 | fixup_nodatasum->mirror_num = failed_mirror_index + 1; | |
b6bfebc1 | 999 | scrub_pending_trans_workers_inc(sctx); |
9e0af237 LB |
1000 | btrfs_init_work(&fixup_nodatasum->work, btrfs_scrub_helper, |
1001 | scrub_fixup_nodatasum, NULL, NULL); | |
0339ef2f QW |
1002 | btrfs_queue_work(fs_info->scrub_workers, |
1003 | &fixup_nodatasum->work); | |
b5d67f64 | 1004 | goto out; |
a2de733c AJ |
1005 | } |
1006 | ||
b5d67f64 SB |
1007 | /* |
1008 | * now build and submit the bios for the other mirrors, check | |
cb2ced73 SB |
1009 | * checksums. |
1010 | * First try to pick the mirror which is completely without I/O | |
b5d67f64 SB |
1011 | * errors and also does not have a checksum error. |
1012 | * If one is found, and if a checksum is present, the full block | |
1013 | * that is known to contain an error is rewritten. Afterwards | |
1014 | * the block is known to be corrected. | |
1015 | * If a mirror is found which is completely correct, and no | |
1016 | * checksum is present, only those pages are rewritten that had | |
1017 | * an I/O error in the block to be repaired, since it cannot be | |
1018 | * determined, which copy of the other pages is better (and it | |
1019 | * could happen otherwise that a correct page would be | |
1020 | * overwritten by a bad one). | |
1021 | */ | |
1022 | for (mirror_index = 0; | |
1023 | mirror_index < BTRFS_MAX_MIRRORS && | |
1024 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1025 | mirror_index++) { | |
cb2ced73 | 1026 | struct scrub_block *sblock_other; |
b5d67f64 | 1027 | |
cb2ced73 SB |
1028 | if (mirror_index == failed_mirror_index) |
1029 | continue; | |
1030 | sblock_other = sblocks_for_recheck + mirror_index; | |
1031 | ||
1032 | /* build and submit the bios, check checksums */ | |
34f5c8e9 SB |
1033 | scrub_recheck_block(fs_info, sblock_other, is_metadata, |
1034 | have_csum, csum, generation, | |
1035 | sctx->csum_size); | |
1036 | ||
1037 | if (!sblock_other->header_error && | |
b5d67f64 SB |
1038 | !sblock_other->checksum_error && |
1039 | sblock_other->no_io_error_seen) { | |
ff023aac SB |
1040 | if (sctx->is_dev_replace) { |
1041 | scrub_write_block_to_dev_replace(sblock_other); | |
1042 | } else { | |
1043 | int force_write = is_metadata || have_csum; | |
1044 | ||
1045 | ret = scrub_repair_block_from_good_copy( | |
1046 | sblock_bad, sblock_other, | |
1047 | force_write); | |
1048 | } | |
b5d67f64 SB |
1049 | if (0 == ret) |
1050 | goto corrected_error; | |
1051 | } | |
1052 | } | |
a2de733c AJ |
1053 | |
1054 | /* | |
ff023aac SB |
1055 | * for dev_replace, pick good pages and write to the target device. |
1056 | */ | |
1057 | if (sctx->is_dev_replace) { | |
1058 | success = 1; | |
1059 | for (page_num = 0; page_num < sblock_bad->page_count; | |
1060 | page_num++) { | |
1061 | int sub_success; | |
1062 | ||
1063 | sub_success = 0; | |
1064 | for (mirror_index = 0; | |
1065 | mirror_index < BTRFS_MAX_MIRRORS && | |
1066 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1067 | mirror_index++) { | |
1068 | struct scrub_block *sblock_other = | |
1069 | sblocks_for_recheck + mirror_index; | |
1070 | struct scrub_page *page_other = | |
1071 | sblock_other->pagev[page_num]; | |
1072 | ||
1073 | if (!page_other->io_error) { | |
1074 | ret = scrub_write_page_to_dev_replace( | |
1075 | sblock_other, page_num); | |
1076 | if (ret == 0) { | |
1077 | /* succeeded for this page */ | |
1078 | sub_success = 1; | |
1079 | break; | |
1080 | } else { | |
1081 | btrfs_dev_replace_stats_inc( | |
1082 | &sctx->dev_root-> | |
1083 | fs_info->dev_replace. | |
1084 | num_write_errors); | |
1085 | } | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | if (!sub_success) { | |
1090 | /* | |
1091 | * did not find a mirror to fetch the page | |
1092 | * from. scrub_write_page_to_dev_replace() | |
1093 | * handles this case (page->io_error), by | |
1094 | * filling the block with zeros before | |
1095 | * submitting the write request | |
1096 | */ | |
1097 | success = 0; | |
1098 | ret = scrub_write_page_to_dev_replace( | |
1099 | sblock_bad, page_num); | |
1100 | if (ret) | |
1101 | btrfs_dev_replace_stats_inc( | |
1102 | &sctx->dev_root->fs_info-> | |
1103 | dev_replace.num_write_errors); | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | goto out; | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * for regular scrub, repair those pages that are errored. | |
1112 | * In case of I/O errors in the area that is supposed to be | |
b5d67f64 SB |
1113 | * repaired, continue by picking good copies of those pages. |
1114 | * Select the good pages from mirrors to rewrite bad pages from | |
1115 | * the area to fix. Afterwards verify the checksum of the block | |
1116 | * that is supposed to be repaired. This verification step is | |
1117 | * only done for the purpose of statistic counting and for the | |
1118 | * final scrub report, whether errors remain. | |
1119 | * A perfect algorithm could make use of the checksum and try | |
1120 | * all possible combinations of pages from the different mirrors | |
1121 | * until the checksum verification succeeds. For example, when | |
1122 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page | |
1123 | * of mirror #2 is readable but the final checksum test fails, | |
1124 | * then the 2nd page of mirror #3 could be tried, whether now | |
1125 | * the final checksum succeedes. But this would be a rare | |
1126 | * exception and is therefore not implemented. At least it is | |
1127 | * avoided that the good copy is overwritten. | |
1128 | * A more useful improvement would be to pick the sectors | |
1129 | * without I/O error based on sector sizes (512 bytes on legacy | |
1130 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one | |
1131 | * mirror could be repaired by taking 512 byte of a different | |
1132 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE | |
1133 | * area are unreadable. | |
a2de733c | 1134 | */ |
a2de733c | 1135 | |
b5d67f64 SB |
1136 | /* can only fix I/O errors from here on */ |
1137 | if (sblock_bad->no_io_error_seen) | |
1138 | goto did_not_correct_error; | |
1139 | ||
1140 | success = 1; | |
1141 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { | |
7a9e9987 | 1142 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
b5d67f64 SB |
1143 | |
1144 | if (!page_bad->io_error) | |
a2de733c | 1145 | continue; |
b5d67f64 SB |
1146 | |
1147 | for (mirror_index = 0; | |
1148 | mirror_index < BTRFS_MAX_MIRRORS && | |
1149 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1150 | mirror_index++) { | |
1151 | struct scrub_block *sblock_other = sblocks_for_recheck + | |
1152 | mirror_index; | |
7a9e9987 SB |
1153 | struct scrub_page *page_other = sblock_other->pagev[ |
1154 | page_num]; | |
b5d67f64 SB |
1155 | |
1156 | if (!page_other->io_error) { | |
1157 | ret = scrub_repair_page_from_good_copy( | |
1158 | sblock_bad, sblock_other, page_num, 0); | |
1159 | if (0 == ret) { | |
1160 | page_bad->io_error = 0; | |
1161 | break; /* succeeded for this page */ | |
1162 | } | |
1163 | } | |
96e36920 | 1164 | } |
a2de733c | 1165 | |
b5d67f64 SB |
1166 | if (page_bad->io_error) { |
1167 | /* did not find a mirror to copy the page from */ | |
1168 | success = 0; | |
1169 | } | |
a2de733c | 1170 | } |
a2de733c | 1171 | |
b5d67f64 SB |
1172 | if (success) { |
1173 | if (is_metadata || have_csum) { | |
1174 | /* | |
1175 | * need to verify the checksum now that all | |
1176 | * sectors on disk are repaired (the write | |
1177 | * request for data to be repaired is on its way). | |
1178 | * Just be lazy and use scrub_recheck_block() | |
1179 | * which re-reads the data before the checksum | |
1180 | * is verified, but most likely the data comes out | |
1181 | * of the page cache. | |
1182 | */ | |
34f5c8e9 SB |
1183 | scrub_recheck_block(fs_info, sblock_bad, |
1184 | is_metadata, have_csum, csum, | |
1185 | generation, sctx->csum_size); | |
1186 | if (!sblock_bad->header_error && | |
b5d67f64 SB |
1187 | !sblock_bad->checksum_error && |
1188 | sblock_bad->no_io_error_seen) | |
1189 | goto corrected_error; | |
1190 | else | |
1191 | goto did_not_correct_error; | |
1192 | } else { | |
1193 | corrected_error: | |
d9d181c1 SB |
1194 | spin_lock(&sctx->stat_lock); |
1195 | sctx->stat.corrected_errors++; | |
1196 | spin_unlock(&sctx->stat_lock); | |
606686ee | 1197 | printk_ratelimited_in_rcu(KERN_ERR |
efe120a0 | 1198 | "BTRFS: fixed up error at logical %llu on dev %s\n", |
c1c9ff7c | 1199 | logical, rcu_str_deref(dev->name)); |
8628764e | 1200 | } |
b5d67f64 SB |
1201 | } else { |
1202 | did_not_correct_error: | |
d9d181c1 SB |
1203 | spin_lock(&sctx->stat_lock); |
1204 | sctx->stat.uncorrectable_errors++; | |
1205 | spin_unlock(&sctx->stat_lock); | |
606686ee | 1206 | printk_ratelimited_in_rcu(KERN_ERR |
efe120a0 | 1207 | "BTRFS: unable to fixup (regular) error at logical %llu on dev %s\n", |
c1c9ff7c | 1208 | logical, rcu_str_deref(dev->name)); |
96e36920 | 1209 | } |
a2de733c | 1210 | |
b5d67f64 SB |
1211 | out: |
1212 | if (sblocks_for_recheck) { | |
1213 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; | |
1214 | mirror_index++) { | |
1215 | struct scrub_block *sblock = sblocks_for_recheck + | |
1216 | mirror_index; | |
1217 | int page_index; | |
1218 | ||
7a9e9987 SB |
1219 | for (page_index = 0; page_index < sblock->page_count; |
1220 | page_index++) { | |
1221 | sblock->pagev[page_index]->sblock = NULL; | |
1222 | scrub_page_put(sblock->pagev[page_index]); | |
1223 | } | |
b5d67f64 SB |
1224 | } |
1225 | kfree(sblocks_for_recheck); | |
1226 | } | |
a2de733c | 1227 | |
b5d67f64 SB |
1228 | return 0; |
1229 | } | |
a2de733c | 1230 | |
d9d181c1 | 1231 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
3ec706c8 | 1232 | struct btrfs_fs_info *fs_info, |
ff023aac | 1233 | struct scrub_block *original_sblock, |
b5d67f64 SB |
1234 | u64 length, u64 logical, |
1235 | struct scrub_block *sblocks_for_recheck) | |
1236 | { | |
1237 | int page_index; | |
1238 | int mirror_index; | |
1239 | int ret; | |
1240 | ||
1241 | /* | |
7a9e9987 | 1242 | * note: the two members ref_count and outstanding_pages |
b5d67f64 SB |
1243 | * are not used (and not set) in the blocks that are used for |
1244 | * the recheck procedure | |
1245 | */ | |
1246 | ||
1247 | page_index = 0; | |
1248 | while (length > 0) { | |
1249 | u64 sublen = min_t(u64, length, PAGE_SIZE); | |
1250 | u64 mapped_length = sublen; | |
1251 | struct btrfs_bio *bbio = NULL; | |
a2de733c | 1252 | |
b5d67f64 SB |
1253 | /* |
1254 | * with a length of PAGE_SIZE, each returned stripe | |
1255 | * represents one mirror | |
1256 | */ | |
29a8d9a0 SB |
1257 | ret = btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS, logical, |
1258 | &mapped_length, &bbio, 0); | |
b5d67f64 SB |
1259 | if (ret || !bbio || mapped_length < sublen) { |
1260 | kfree(bbio); | |
1261 | return -EIO; | |
1262 | } | |
a2de733c | 1263 | |
ff023aac | 1264 | BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
1265 | for (mirror_index = 0; mirror_index < (int)bbio->num_stripes; |
1266 | mirror_index++) { | |
1267 | struct scrub_block *sblock; | |
1268 | struct scrub_page *page; | |
1269 | ||
1270 | if (mirror_index >= BTRFS_MAX_MIRRORS) | |
1271 | continue; | |
1272 | ||
1273 | sblock = sblocks_for_recheck + mirror_index; | |
7a9e9987 SB |
1274 | sblock->sctx = sctx; |
1275 | page = kzalloc(sizeof(*page), GFP_NOFS); | |
1276 | if (!page) { | |
1277 | leave_nomem: | |
d9d181c1 SB |
1278 | spin_lock(&sctx->stat_lock); |
1279 | sctx->stat.malloc_errors++; | |
1280 | spin_unlock(&sctx->stat_lock); | |
cf93dcce | 1281 | kfree(bbio); |
b5d67f64 SB |
1282 | return -ENOMEM; |
1283 | } | |
7a9e9987 SB |
1284 | scrub_page_get(page); |
1285 | sblock->pagev[page_index] = page; | |
1286 | page->logical = logical; | |
1287 | page->physical = bbio->stripes[mirror_index].physical; | |
ff023aac SB |
1288 | BUG_ON(page_index >= original_sblock->page_count); |
1289 | page->physical_for_dev_replace = | |
1290 | original_sblock->pagev[page_index]-> | |
1291 | physical_for_dev_replace; | |
7a9e9987 SB |
1292 | /* for missing devices, dev->bdev is NULL */ |
1293 | page->dev = bbio->stripes[mirror_index].dev; | |
1294 | page->mirror_num = mirror_index + 1; | |
b5d67f64 | 1295 | sblock->page_count++; |
7a9e9987 SB |
1296 | page->page = alloc_page(GFP_NOFS); |
1297 | if (!page->page) | |
1298 | goto leave_nomem; | |
b5d67f64 SB |
1299 | } |
1300 | kfree(bbio); | |
1301 | length -= sublen; | |
1302 | logical += sublen; | |
1303 | page_index++; | |
1304 | } | |
1305 | ||
1306 | return 0; | |
96e36920 ID |
1307 | } |
1308 | ||
b5d67f64 SB |
1309 | /* |
1310 | * this function will check the on disk data for checksum errors, header | |
1311 | * errors and read I/O errors. If any I/O errors happen, the exact pages | |
1312 | * which are errored are marked as being bad. The goal is to enable scrub | |
1313 | * to take those pages that are not errored from all the mirrors so that | |
1314 | * the pages that are errored in the just handled mirror can be repaired. | |
1315 | */ | |
34f5c8e9 SB |
1316 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
1317 | struct scrub_block *sblock, int is_metadata, | |
1318 | int have_csum, u8 *csum, u64 generation, | |
1319 | u16 csum_size) | |
96e36920 | 1320 | { |
b5d67f64 | 1321 | int page_num; |
96e36920 | 1322 | |
b5d67f64 SB |
1323 | sblock->no_io_error_seen = 1; |
1324 | sblock->header_error = 0; | |
1325 | sblock->checksum_error = 0; | |
96e36920 | 1326 | |
b5d67f64 SB |
1327 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1328 | struct bio *bio; | |
7a9e9987 | 1329 | struct scrub_page *page = sblock->pagev[page_num]; |
b5d67f64 | 1330 | |
442a4f63 | 1331 | if (page->dev->bdev == NULL) { |
ea9947b4 SB |
1332 | page->io_error = 1; |
1333 | sblock->no_io_error_seen = 0; | |
1334 | continue; | |
1335 | } | |
1336 | ||
7a9e9987 | 1337 | WARN_ON(!page->page); |
9be3395b | 1338 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
34f5c8e9 SB |
1339 | if (!bio) { |
1340 | page->io_error = 1; | |
1341 | sblock->no_io_error_seen = 0; | |
1342 | continue; | |
1343 | } | |
442a4f63 | 1344 | bio->bi_bdev = page->dev->bdev; |
4f024f37 | 1345 | bio->bi_iter.bi_sector = page->physical >> 9; |
b5d67f64 | 1346 | |
34f5c8e9 | 1347 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
33879d45 | 1348 | if (btrfsic_submit_bio_wait(READ, bio)) |
b5d67f64 | 1349 | sblock->no_io_error_seen = 0; |
33879d45 | 1350 | |
b5d67f64 SB |
1351 | bio_put(bio); |
1352 | } | |
96e36920 | 1353 | |
b5d67f64 SB |
1354 | if (sblock->no_io_error_seen) |
1355 | scrub_recheck_block_checksum(fs_info, sblock, is_metadata, | |
1356 | have_csum, csum, generation, | |
1357 | csum_size); | |
1358 | ||
34f5c8e9 | 1359 | return; |
a2de733c AJ |
1360 | } |
1361 | ||
17a9be2f MX |
1362 | static inline int scrub_check_fsid(u8 fsid[], |
1363 | struct scrub_page *spage) | |
1364 | { | |
1365 | struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices; | |
1366 | int ret; | |
1367 | ||
1368 | ret = memcmp(fsid, fs_devices->fsid, BTRFS_UUID_SIZE); | |
1369 | return !ret; | |
1370 | } | |
1371 | ||
b5d67f64 SB |
1372 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
1373 | struct scrub_block *sblock, | |
1374 | int is_metadata, int have_csum, | |
1375 | const u8 *csum, u64 generation, | |
1376 | u16 csum_size) | |
a2de733c | 1377 | { |
b5d67f64 SB |
1378 | int page_num; |
1379 | u8 calculated_csum[BTRFS_CSUM_SIZE]; | |
1380 | u32 crc = ~(u32)0; | |
b5d67f64 SB |
1381 | void *mapped_buffer; |
1382 | ||
7a9e9987 | 1383 | WARN_ON(!sblock->pagev[0]->page); |
b5d67f64 SB |
1384 | if (is_metadata) { |
1385 | struct btrfs_header *h; | |
1386 | ||
7a9e9987 | 1387 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 SB |
1388 | h = (struct btrfs_header *)mapped_buffer; |
1389 | ||
3cae210f | 1390 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h) || |
17a9be2f | 1391 | !scrub_check_fsid(h->fsid, sblock->pagev[0]) || |
b5d67f64 | 1392 | memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, |
442a4f63 | 1393 | BTRFS_UUID_SIZE)) { |
b5d67f64 | 1394 | sblock->header_error = 1; |
3cae210f | 1395 | } else if (generation != btrfs_stack_header_generation(h)) { |
442a4f63 SB |
1396 | sblock->header_error = 1; |
1397 | sblock->generation_error = 1; | |
1398 | } | |
b5d67f64 SB |
1399 | csum = h->csum; |
1400 | } else { | |
1401 | if (!have_csum) | |
1402 | return; | |
a2de733c | 1403 | |
7a9e9987 | 1404 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 | 1405 | } |
a2de733c | 1406 | |
b5d67f64 SB |
1407 | for (page_num = 0;;) { |
1408 | if (page_num == 0 && is_metadata) | |
b0496686 | 1409 | crc = btrfs_csum_data( |
b5d67f64 SB |
1410 | ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE, |
1411 | crc, PAGE_SIZE - BTRFS_CSUM_SIZE); | |
1412 | else | |
b0496686 | 1413 | crc = btrfs_csum_data(mapped_buffer, crc, PAGE_SIZE); |
b5d67f64 | 1414 | |
9613bebb | 1415 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1416 | page_num++; |
1417 | if (page_num >= sblock->page_count) | |
1418 | break; | |
7a9e9987 | 1419 | WARN_ON(!sblock->pagev[page_num]->page); |
b5d67f64 | 1420 | |
7a9e9987 | 1421 | mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page); |
b5d67f64 SB |
1422 | } |
1423 | ||
1424 | btrfs_csum_final(crc, calculated_csum); | |
1425 | if (memcmp(calculated_csum, csum, csum_size)) | |
1426 | sblock->checksum_error = 1; | |
a2de733c AJ |
1427 | } |
1428 | ||
b5d67f64 SB |
1429 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
1430 | struct scrub_block *sblock_good, | |
1431 | int force_write) | |
1432 | { | |
1433 | int page_num; | |
1434 | int ret = 0; | |
96e36920 | 1435 | |
b5d67f64 SB |
1436 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
1437 | int ret_sub; | |
96e36920 | 1438 | |
b5d67f64 SB |
1439 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
1440 | sblock_good, | |
1441 | page_num, | |
1442 | force_write); | |
1443 | if (ret_sub) | |
1444 | ret = ret_sub; | |
a2de733c | 1445 | } |
b5d67f64 SB |
1446 | |
1447 | return ret; | |
1448 | } | |
1449 | ||
1450 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
1451 | struct scrub_block *sblock_good, | |
1452 | int page_num, int force_write) | |
1453 | { | |
7a9e9987 SB |
1454 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
1455 | struct scrub_page *page_good = sblock_good->pagev[page_num]; | |
b5d67f64 | 1456 | |
7a9e9987 SB |
1457 | BUG_ON(page_bad->page == NULL); |
1458 | BUG_ON(page_good->page == NULL); | |
b5d67f64 SB |
1459 | if (force_write || sblock_bad->header_error || |
1460 | sblock_bad->checksum_error || page_bad->io_error) { | |
1461 | struct bio *bio; | |
1462 | int ret; | |
b5d67f64 | 1463 | |
ff023aac | 1464 | if (!page_bad->dev->bdev) { |
efe120a0 FH |
1465 | printk_ratelimited(KERN_WARNING "BTRFS: " |
1466 | "scrub_repair_page_from_good_copy(bdev == NULL) " | |
1467 | "is unexpected!\n"); | |
ff023aac SB |
1468 | return -EIO; |
1469 | } | |
1470 | ||
9be3395b | 1471 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
e627ee7b TI |
1472 | if (!bio) |
1473 | return -EIO; | |
442a4f63 | 1474 | bio->bi_bdev = page_bad->dev->bdev; |
4f024f37 | 1475 | bio->bi_iter.bi_sector = page_bad->physical >> 9; |
b5d67f64 SB |
1476 | |
1477 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); | |
1478 | if (PAGE_SIZE != ret) { | |
1479 | bio_put(bio); | |
1480 | return -EIO; | |
13db62b7 | 1481 | } |
b5d67f64 | 1482 | |
33879d45 | 1483 | if (btrfsic_submit_bio_wait(WRITE, bio)) { |
442a4f63 SB |
1484 | btrfs_dev_stat_inc_and_print(page_bad->dev, |
1485 | BTRFS_DEV_STAT_WRITE_ERRS); | |
ff023aac SB |
1486 | btrfs_dev_replace_stats_inc( |
1487 | &sblock_bad->sctx->dev_root->fs_info-> | |
1488 | dev_replace.num_write_errors); | |
442a4f63 SB |
1489 | bio_put(bio); |
1490 | return -EIO; | |
1491 | } | |
b5d67f64 | 1492 | bio_put(bio); |
a2de733c AJ |
1493 | } |
1494 | ||
b5d67f64 SB |
1495 | return 0; |
1496 | } | |
1497 | ||
ff023aac SB |
1498 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
1499 | { | |
1500 | int page_num; | |
1501 | ||
1502 | for (page_num = 0; page_num < sblock->page_count; page_num++) { | |
1503 | int ret; | |
1504 | ||
1505 | ret = scrub_write_page_to_dev_replace(sblock, page_num); | |
1506 | if (ret) | |
1507 | btrfs_dev_replace_stats_inc( | |
1508 | &sblock->sctx->dev_root->fs_info->dev_replace. | |
1509 | num_write_errors); | |
1510 | } | |
1511 | } | |
1512 | ||
1513 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
1514 | int page_num) | |
1515 | { | |
1516 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1517 | ||
1518 | BUG_ON(spage->page == NULL); | |
1519 | if (spage->io_error) { | |
1520 | void *mapped_buffer = kmap_atomic(spage->page); | |
1521 | ||
1522 | memset(mapped_buffer, 0, PAGE_CACHE_SIZE); | |
1523 | flush_dcache_page(spage->page); | |
1524 | kunmap_atomic(mapped_buffer); | |
1525 | } | |
1526 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); | |
1527 | } | |
1528 | ||
1529 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
1530 | struct scrub_page *spage) | |
1531 | { | |
1532 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1533 | struct scrub_bio *sbio; | |
1534 | int ret; | |
1535 | ||
1536 | mutex_lock(&wr_ctx->wr_lock); | |
1537 | again: | |
1538 | if (!wr_ctx->wr_curr_bio) { | |
1539 | wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio), | |
1540 | GFP_NOFS); | |
1541 | if (!wr_ctx->wr_curr_bio) { | |
1542 | mutex_unlock(&wr_ctx->wr_lock); | |
1543 | return -ENOMEM; | |
1544 | } | |
1545 | wr_ctx->wr_curr_bio->sctx = sctx; | |
1546 | wr_ctx->wr_curr_bio->page_count = 0; | |
1547 | } | |
1548 | sbio = wr_ctx->wr_curr_bio; | |
1549 | if (sbio->page_count == 0) { | |
1550 | struct bio *bio; | |
1551 | ||
1552 | sbio->physical = spage->physical_for_dev_replace; | |
1553 | sbio->logical = spage->logical; | |
1554 | sbio->dev = wr_ctx->tgtdev; | |
1555 | bio = sbio->bio; | |
1556 | if (!bio) { | |
9be3395b | 1557 | bio = btrfs_io_bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio); |
ff023aac SB |
1558 | if (!bio) { |
1559 | mutex_unlock(&wr_ctx->wr_lock); | |
1560 | return -ENOMEM; | |
1561 | } | |
1562 | sbio->bio = bio; | |
1563 | } | |
1564 | ||
1565 | bio->bi_private = sbio; | |
1566 | bio->bi_end_io = scrub_wr_bio_end_io; | |
1567 | bio->bi_bdev = sbio->dev->bdev; | |
4f024f37 | 1568 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
ff023aac SB |
1569 | sbio->err = 0; |
1570 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != | |
1571 | spage->physical_for_dev_replace || | |
1572 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
1573 | spage->logical) { | |
1574 | scrub_wr_submit(sctx); | |
1575 | goto again; | |
1576 | } | |
1577 | ||
1578 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1579 | if (ret != PAGE_SIZE) { | |
1580 | if (sbio->page_count < 1) { | |
1581 | bio_put(sbio->bio); | |
1582 | sbio->bio = NULL; | |
1583 | mutex_unlock(&wr_ctx->wr_lock); | |
1584 | return -EIO; | |
1585 | } | |
1586 | scrub_wr_submit(sctx); | |
1587 | goto again; | |
1588 | } | |
1589 | ||
1590 | sbio->pagev[sbio->page_count] = spage; | |
1591 | scrub_page_get(spage); | |
1592 | sbio->page_count++; | |
1593 | if (sbio->page_count == wr_ctx->pages_per_wr_bio) | |
1594 | scrub_wr_submit(sctx); | |
1595 | mutex_unlock(&wr_ctx->wr_lock); | |
1596 | ||
1597 | return 0; | |
1598 | } | |
1599 | ||
1600 | static void scrub_wr_submit(struct scrub_ctx *sctx) | |
1601 | { | |
1602 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1603 | struct scrub_bio *sbio; | |
1604 | ||
1605 | if (!wr_ctx->wr_curr_bio) | |
1606 | return; | |
1607 | ||
1608 | sbio = wr_ctx->wr_curr_bio; | |
1609 | wr_ctx->wr_curr_bio = NULL; | |
1610 | WARN_ON(!sbio->bio->bi_bdev); | |
1611 | scrub_pending_bio_inc(sctx); | |
1612 | /* process all writes in a single worker thread. Then the block layer | |
1613 | * orders the requests before sending them to the driver which | |
1614 | * doubled the write performance on spinning disks when measured | |
1615 | * with Linux 3.5 */ | |
1616 | btrfsic_submit_bio(WRITE, sbio->bio); | |
1617 | } | |
1618 | ||
1619 | static void scrub_wr_bio_end_io(struct bio *bio, int err) | |
1620 | { | |
1621 | struct scrub_bio *sbio = bio->bi_private; | |
1622 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; | |
1623 | ||
1624 | sbio->err = err; | |
1625 | sbio->bio = bio; | |
1626 | ||
9e0af237 LB |
1627 | btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper, |
1628 | scrub_wr_bio_end_io_worker, NULL, NULL); | |
0339ef2f | 1629 | btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work); |
ff023aac SB |
1630 | } |
1631 | ||
1632 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) | |
1633 | { | |
1634 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
1635 | struct scrub_ctx *sctx = sbio->sctx; | |
1636 | int i; | |
1637 | ||
1638 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); | |
1639 | if (sbio->err) { | |
1640 | struct btrfs_dev_replace *dev_replace = | |
1641 | &sbio->sctx->dev_root->fs_info->dev_replace; | |
1642 | ||
1643 | for (i = 0; i < sbio->page_count; i++) { | |
1644 | struct scrub_page *spage = sbio->pagev[i]; | |
1645 | ||
1646 | spage->io_error = 1; | |
1647 | btrfs_dev_replace_stats_inc(&dev_replace-> | |
1648 | num_write_errors); | |
1649 | } | |
1650 | } | |
1651 | ||
1652 | for (i = 0; i < sbio->page_count; i++) | |
1653 | scrub_page_put(sbio->pagev[i]); | |
1654 | ||
1655 | bio_put(sbio->bio); | |
1656 | kfree(sbio); | |
1657 | scrub_pending_bio_dec(sctx); | |
1658 | } | |
1659 | ||
1660 | static int scrub_checksum(struct scrub_block *sblock) | |
b5d67f64 SB |
1661 | { |
1662 | u64 flags; | |
1663 | int ret; | |
1664 | ||
7a9e9987 SB |
1665 | WARN_ON(sblock->page_count < 1); |
1666 | flags = sblock->pagev[0]->flags; | |
b5d67f64 SB |
1667 | ret = 0; |
1668 | if (flags & BTRFS_EXTENT_FLAG_DATA) | |
1669 | ret = scrub_checksum_data(sblock); | |
1670 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) | |
1671 | ret = scrub_checksum_tree_block(sblock); | |
1672 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
1673 | (void)scrub_checksum_super(sblock); | |
1674 | else | |
1675 | WARN_ON(1); | |
1676 | if (ret) | |
1677 | scrub_handle_errored_block(sblock); | |
ff023aac SB |
1678 | |
1679 | return ret; | |
a2de733c AJ |
1680 | } |
1681 | ||
b5d67f64 | 1682 | static int scrub_checksum_data(struct scrub_block *sblock) |
a2de733c | 1683 | { |
d9d181c1 | 1684 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1685 | u8 csum[BTRFS_CSUM_SIZE]; |
b5d67f64 SB |
1686 | u8 *on_disk_csum; |
1687 | struct page *page; | |
1688 | void *buffer; | |
a2de733c AJ |
1689 | u32 crc = ~(u32)0; |
1690 | int fail = 0; | |
b5d67f64 SB |
1691 | u64 len; |
1692 | int index; | |
a2de733c | 1693 | |
b5d67f64 | 1694 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1695 | if (!sblock->pagev[0]->have_csum) |
a2de733c AJ |
1696 | return 0; |
1697 | ||
7a9e9987 SB |
1698 | on_disk_csum = sblock->pagev[0]->csum; |
1699 | page = sblock->pagev[0]->page; | |
9613bebb | 1700 | buffer = kmap_atomic(page); |
b5d67f64 | 1701 | |
d9d181c1 | 1702 | len = sctx->sectorsize; |
b5d67f64 SB |
1703 | index = 0; |
1704 | for (;;) { | |
1705 | u64 l = min_t(u64, len, PAGE_SIZE); | |
1706 | ||
b0496686 | 1707 | crc = btrfs_csum_data(buffer, crc, l); |
9613bebb | 1708 | kunmap_atomic(buffer); |
b5d67f64 SB |
1709 | len -= l; |
1710 | if (len == 0) | |
1711 | break; | |
1712 | index++; | |
1713 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1714 | BUG_ON(!sblock->pagev[index]->page); |
1715 | page = sblock->pagev[index]->page; | |
9613bebb | 1716 | buffer = kmap_atomic(page); |
b5d67f64 SB |
1717 | } |
1718 | ||
a2de733c | 1719 | btrfs_csum_final(crc, csum); |
d9d181c1 | 1720 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1721 | fail = 1; |
1722 | ||
a2de733c AJ |
1723 | return fail; |
1724 | } | |
1725 | ||
b5d67f64 | 1726 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
a2de733c | 1727 | { |
d9d181c1 | 1728 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1729 | struct btrfs_header *h; |
a36cf8b8 | 1730 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 1731 | struct btrfs_fs_info *fs_info = root->fs_info; |
b5d67f64 SB |
1732 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1733 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1734 | struct page *page; | |
1735 | void *mapped_buffer; | |
1736 | u64 mapped_size; | |
1737 | void *p; | |
a2de733c AJ |
1738 | u32 crc = ~(u32)0; |
1739 | int fail = 0; | |
1740 | int crc_fail = 0; | |
b5d67f64 SB |
1741 | u64 len; |
1742 | int index; | |
1743 | ||
1744 | BUG_ON(sblock->page_count < 1); | |
7a9e9987 | 1745 | page = sblock->pagev[0]->page; |
9613bebb | 1746 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1747 | h = (struct btrfs_header *)mapped_buffer; |
d9d181c1 | 1748 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
a2de733c AJ |
1749 | |
1750 | /* | |
1751 | * we don't use the getter functions here, as we | |
1752 | * a) don't have an extent buffer and | |
1753 | * b) the page is already kmapped | |
1754 | */ | |
a2de733c | 1755 | |
3cae210f | 1756 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h)) |
a2de733c AJ |
1757 | ++fail; |
1758 | ||
3cae210f | 1759 | if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h)) |
a2de733c AJ |
1760 | ++fail; |
1761 | ||
17a9be2f | 1762 | if (!scrub_check_fsid(h->fsid, sblock->pagev[0])) |
a2de733c AJ |
1763 | ++fail; |
1764 | ||
1765 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
1766 | BTRFS_UUID_SIZE)) | |
1767 | ++fail; | |
1768 | ||
d9d181c1 | 1769 | len = sctx->nodesize - BTRFS_CSUM_SIZE; |
b5d67f64 SB |
1770 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
1771 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1772 | index = 0; | |
1773 | for (;;) { | |
1774 | u64 l = min_t(u64, len, mapped_size); | |
1775 | ||
b0496686 | 1776 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 1777 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1778 | len -= l; |
1779 | if (len == 0) | |
1780 | break; | |
1781 | index++; | |
1782 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1783 | BUG_ON(!sblock->pagev[index]->page); |
1784 | page = sblock->pagev[index]->page; | |
9613bebb | 1785 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1786 | mapped_size = PAGE_SIZE; |
1787 | p = mapped_buffer; | |
1788 | } | |
1789 | ||
1790 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1791 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1792 | ++crc_fail; |
1793 | ||
a2de733c AJ |
1794 | return fail || crc_fail; |
1795 | } | |
1796 | ||
b5d67f64 | 1797 | static int scrub_checksum_super(struct scrub_block *sblock) |
a2de733c AJ |
1798 | { |
1799 | struct btrfs_super_block *s; | |
d9d181c1 | 1800 | struct scrub_ctx *sctx = sblock->sctx; |
b5d67f64 SB |
1801 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1802 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1803 | struct page *page; | |
1804 | void *mapped_buffer; | |
1805 | u64 mapped_size; | |
1806 | void *p; | |
a2de733c | 1807 | u32 crc = ~(u32)0; |
442a4f63 SB |
1808 | int fail_gen = 0; |
1809 | int fail_cor = 0; | |
b5d67f64 SB |
1810 | u64 len; |
1811 | int index; | |
a2de733c | 1812 | |
b5d67f64 | 1813 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1814 | page = sblock->pagev[0]->page; |
9613bebb | 1815 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1816 | s = (struct btrfs_super_block *)mapped_buffer; |
d9d181c1 | 1817 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
a2de733c | 1818 | |
3cae210f | 1819 | if (sblock->pagev[0]->logical != btrfs_super_bytenr(s)) |
442a4f63 | 1820 | ++fail_cor; |
a2de733c | 1821 | |
3cae210f | 1822 | if (sblock->pagev[0]->generation != btrfs_super_generation(s)) |
442a4f63 | 1823 | ++fail_gen; |
a2de733c | 1824 | |
17a9be2f | 1825 | if (!scrub_check_fsid(s->fsid, sblock->pagev[0])) |
442a4f63 | 1826 | ++fail_cor; |
a2de733c | 1827 | |
b5d67f64 SB |
1828 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
1829 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; | |
1830 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1831 | index = 0; | |
1832 | for (;;) { | |
1833 | u64 l = min_t(u64, len, mapped_size); | |
1834 | ||
b0496686 | 1835 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 1836 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1837 | len -= l; |
1838 | if (len == 0) | |
1839 | break; | |
1840 | index++; | |
1841 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1842 | BUG_ON(!sblock->pagev[index]->page); |
1843 | page = sblock->pagev[index]->page; | |
9613bebb | 1844 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1845 | mapped_size = PAGE_SIZE; |
1846 | p = mapped_buffer; | |
1847 | } | |
1848 | ||
1849 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1850 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
442a4f63 | 1851 | ++fail_cor; |
a2de733c | 1852 | |
442a4f63 | 1853 | if (fail_cor + fail_gen) { |
a2de733c AJ |
1854 | /* |
1855 | * if we find an error in a super block, we just report it. | |
1856 | * They will get written with the next transaction commit | |
1857 | * anyway | |
1858 | */ | |
d9d181c1 SB |
1859 | spin_lock(&sctx->stat_lock); |
1860 | ++sctx->stat.super_errors; | |
1861 | spin_unlock(&sctx->stat_lock); | |
442a4f63 | 1862 | if (fail_cor) |
7a9e9987 | 1863 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 SB |
1864 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
1865 | else | |
7a9e9987 | 1866 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 | 1867 | BTRFS_DEV_STAT_GENERATION_ERRS); |
a2de733c AJ |
1868 | } |
1869 | ||
442a4f63 | 1870 | return fail_cor + fail_gen; |
a2de733c AJ |
1871 | } |
1872 | ||
b5d67f64 SB |
1873 | static void scrub_block_get(struct scrub_block *sblock) |
1874 | { | |
1875 | atomic_inc(&sblock->ref_count); | |
1876 | } | |
1877 | ||
1878 | static void scrub_block_put(struct scrub_block *sblock) | |
1879 | { | |
1880 | if (atomic_dec_and_test(&sblock->ref_count)) { | |
1881 | int i; | |
1882 | ||
1883 | for (i = 0; i < sblock->page_count; i++) | |
7a9e9987 | 1884 | scrub_page_put(sblock->pagev[i]); |
b5d67f64 SB |
1885 | kfree(sblock); |
1886 | } | |
1887 | } | |
1888 | ||
7a9e9987 SB |
1889 | static void scrub_page_get(struct scrub_page *spage) |
1890 | { | |
1891 | atomic_inc(&spage->ref_count); | |
1892 | } | |
1893 | ||
1894 | static void scrub_page_put(struct scrub_page *spage) | |
1895 | { | |
1896 | if (atomic_dec_and_test(&spage->ref_count)) { | |
1897 | if (spage->page) | |
1898 | __free_page(spage->page); | |
1899 | kfree(spage); | |
1900 | } | |
1901 | } | |
1902 | ||
d9d181c1 | 1903 | static void scrub_submit(struct scrub_ctx *sctx) |
a2de733c AJ |
1904 | { |
1905 | struct scrub_bio *sbio; | |
1906 | ||
d9d181c1 | 1907 | if (sctx->curr == -1) |
1623edeb | 1908 | return; |
a2de733c | 1909 | |
d9d181c1 SB |
1910 | sbio = sctx->bios[sctx->curr]; |
1911 | sctx->curr = -1; | |
b6bfebc1 | 1912 | scrub_pending_bio_inc(sctx); |
a2de733c | 1913 | |
ff023aac SB |
1914 | if (!sbio->bio->bi_bdev) { |
1915 | /* | |
1916 | * this case should not happen. If btrfs_map_block() is | |
1917 | * wrong, it could happen for dev-replace operations on | |
1918 | * missing devices when no mirrors are available, but in | |
1919 | * this case it should already fail the mount. | |
1920 | * This case is handled correctly (but _very_ slowly). | |
1921 | */ | |
1922 | printk_ratelimited(KERN_WARNING | |
efe120a0 | 1923 | "BTRFS: scrub_submit(bio bdev == NULL) is unexpected!\n"); |
ff023aac SB |
1924 | bio_endio(sbio->bio, -EIO); |
1925 | } else { | |
1926 | btrfsic_submit_bio(READ, sbio->bio); | |
1927 | } | |
a2de733c AJ |
1928 | } |
1929 | ||
ff023aac SB |
1930 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
1931 | struct scrub_page *spage) | |
a2de733c | 1932 | { |
b5d67f64 | 1933 | struct scrub_block *sblock = spage->sblock; |
a2de733c | 1934 | struct scrub_bio *sbio; |
69f4cb52 | 1935 | int ret; |
a2de733c AJ |
1936 | |
1937 | again: | |
1938 | /* | |
1939 | * grab a fresh bio or wait for one to become available | |
1940 | */ | |
d9d181c1 SB |
1941 | while (sctx->curr == -1) { |
1942 | spin_lock(&sctx->list_lock); | |
1943 | sctx->curr = sctx->first_free; | |
1944 | if (sctx->curr != -1) { | |
1945 | sctx->first_free = sctx->bios[sctx->curr]->next_free; | |
1946 | sctx->bios[sctx->curr]->next_free = -1; | |
1947 | sctx->bios[sctx->curr]->page_count = 0; | |
1948 | spin_unlock(&sctx->list_lock); | |
a2de733c | 1949 | } else { |
d9d181c1 SB |
1950 | spin_unlock(&sctx->list_lock); |
1951 | wait_event(sctx->list_wait, sctx->first_free != -1); | |
a2de733c AJ |
1952 | } |
1953 | } | |
d9d181c1 | 1954 | sbio = sctx->bios[sctx->curr]; |
b5d67f64 | 1955 | if (sbio->page_count == 0) { |
69f4cb52 AJ |
1956 | struct bio *bio; |
1957 | ||
b5d67f64 SB |
1958 | sbio->physical = spage->physical; |
1959 | sbio->logical = spage->logical; | |
a36cf8b8 | 1960 | sbio->dev = spage->dev; |
b5d67f64 SB |
1961 | bio = sbio->bio; |
1962 | if (!bio) { | |
9be3395b | 1963 | bio = btrfs_io_bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio); |
b5d67f64 SB |
1964 | if (!bio) |
1965 | return -ENOMEM; | |
1966 | sbio->bio = bio; | |
1967 | } | |
69f4cb52 AJ |
1968 | |
1969 | bio->bi_private = sbio; | |
1970 | bio->bi_end_io = scrub_bio_end_io; | |
a36cf8b8 | 1971 | bio->bi_bdev = sbio->dev->bdev; |
4f024f37 | 1972 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
69f4cb52 | 1973 | sbio->err = 0; |
b5d67f64 SB |
1974 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
1975 | spage->physical || | |
1976 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
a36cf8b8 SB |
1977 | spage->logical || |
1978 | sbio->dev != spage->dev) { | |
d9d181c1 | 1979 | scrub_submit(sctx); |
a2de733c AJ |
1980 | goto again; |
1981 | } | |
69f4cb52 | 1982 | |
b5d67f64 SB |
1983 | sbio->pagev[sbio->page_count] = spage; |
1984 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1985 | if (ret != PAGE_SIZE) { | |
1986 | if (sbio->page_count < 1) { | |
1987 | bio_put(sbio->bio); | |
1988 | sbio->bio = NULL; | |
1989 | return -EIO; | |
1990 | } | |
d9d181c1 | 1991 | scrub_submit(sctx); |
69f4cb52 AJ |
1992 | goto again; |
1993 | } | |
1994 | ||
ff023aac | 1995 | scrub_block_get(sblock); /* one for the page added to the bio */ |
b5d67f64 SB |
1996 | atomic_inc(&sblock->outstanding_pages); |
1997 | sbio->page_count++; | |
ff023aac | 1998 | if (sbio->page_count == sctx->pages_per_rd_bio) |
d9d181c1 | 1999 | scrub_submit(sctx); |
b5d67f64 SB |
2000 | |
2001 | return 0; | |
2002 | } | |
2003 | ||
d9d181c1 | 2004 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2005 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
2006 | u64 gen, int mirror_num, u8 *csum, int force, |
2007 | u64 physical_for_dev_replace) | |
b5d67f64 SB |
2008 | { |
2009 | struct scrub_block *sblock; | |
2010 | int index; | |
2011 | ||
2012 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
2013 | if (!sblock) { | |
d9d181c1 SB |
2014 | spin_lock(&sctx->stat_lock); |
2015 | sctx->stat.malloc_errors++; | |
2016 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2017 | return -ENOMEM; |
a2de733c | 2018 | } |
b5d67f64 | 2019 | |
7a9e9987 SB |
2020 | /* one ref inside this function, plus one for each page added to |
2021 | * a bio later on */ | |
b5d67f64 | 2022 | atomic_set(&sblock->ref_count, 1); |
d9d181c1 | 2023 | sblock->sctx = sctx; |
b5d67f64 SB |
2024 | sblock->no_io_error_seen = 1; |
2025 | ||
2026 | for (index = 0; len > 0; index++) { | |
7a9e9987 | 2027 | struct scrub_page *spage; |
b5d67f64 SB |
2028 | u64 l = min_t(u64, len, PAGE_SIZE); |
2029 | ||
7a9e9987 SB |
2030 | spage = kzalloc(sizeof(*spage), GFP_NOFS); |
2031 | if (!spage) { | |
2032 | leave_nomem: | |
d9d181c1 SB |
2033 | spin_lock(&sctx->stat_lock); |
2034 | sctx->stat.malloc_errors++; | |
2035 | spin_unlock(&sctx->stat_lock); | |
7a9e9987 | 2036 | scrub_block_put(sblock); |
b5d67f64 SB |
2037 | return -ENOMEM; |
2038 | } | |
7a9e9987 SB |
2039 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
2040 | scrub_page_get(spage); | |
2041 | sblock->pagev[index] = spage; | |
b5d67f64 | 2042 | spage->sblock = sblock; |
a36cf8b8 | 2043 | spage->dev = dev; |
b5d67f64 SB |
2044 | spage->flags = flags; |
2045 | spage->generation = gen; | |
2046 | spage->logical = logical; | |
2047 | spage->physical = physical; | |
ff023aac | 2048 | spage->physical_for_dev_replace = physical_for_dev_replace; |
b5d67f64 SB |
2049 | spage->mirror_num = mirror_num; |
2050 | if (csum) { | |
2051 | spage->have_csum = 1; | |
d9d181c1 | 2052 | memcpy(spage->csum, csum, sctx->csum_size); |
b5d67f64 SB |
2053 | } else { |
2054 | spage->have_csum = 0; | |
2055 | } | |
2056 | sblock->page_count++; | |
7a9e9987 SB |
2057 | spage->page = alloc_page(GFP_NOFS); |
2058 | if (!spage->page) | |
2059 | goto leave_nomem; | |
b5d67f64 SB |
2060 | len -= l; |
2061 | logical += l; | |
2062 | physical += l; | |
ff023aac | 2063 | physical_for_dev_replace += l; |
b5d67f64 SB |
2064 | } |
2065 | ||
7a9e9987 | 2066 | WARN_ON(sblock->page_count == 0); |
b5d67f64 | 2067 | for (index = 0; index < sblock->page_count; index++) { |
7a9e9987 | 2068 | struct scrub_page *spage = sblock->pagev[index]; |
1bc87793 AJ |
2069 | int ret; |
2070 | ||
ff023aac | 2071 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
b5d67f64 SB |
2072 | if (ret) { |
2073 | scrub_block_put(sblock); | |
1bc87793 | 2074 | return ret; |
b5d67f64 | 2075 | } |
1bc87793 | 2076 | } |
a2de733c | 2077 | |
b5d67f64 | 2078 | if (force) |
d9d181c1 | 2079 | scrub_submit(sctx); |
a2de733c | 2080 | |
b5d67f64 SB |
2081 | /* last one frees, either here or in bio completion for last page */ |
2082 | scrub_block_put(sblock); | |
a2de733c AJ |
2083 | return 0; |
2084 | } | |
2085 | ||
b5d67f64 SB |
2086 | static void scrub_bio_end_io(struct bio *bio, int err) |
2087 | { | |
2088 | struct scrub_bio *sbio = bio->bi_private; | |
a36cf8b8 | 2089 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
b5d67f64 SB |
2090 | |
2091 | sbio->err = err; | |
2092 | sbio->bio = bio; | |
2093 | ||
0339ef2f | 2094 | btrfs_queue_work(fs_info->scrub_workers, &sbio->work); |
b5d67f64 SB |
2095 | } |
2096 | ||
2097 | static void scrub_bio_end_io_worker(struct btrfs_work *work) | |
2098 | { | |
2099 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
d9d181c1 | 2100 | struct scrub_ctx *sctx = sbio->sctx; |
b5d67f64 SB |
2101 | int i; |
2102 | ||
ff023aac | 2103 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
2104 | if (sbio->err) { |
2105 | for (i = 0; i < sbio->page_count; i++) { | |
2106 | struct scrub_page *spage = sbio->pagev[i]; | |
2107 | ||
2108 | spage->io_error = 1; | |
2109 | spage->sblock->no_io_error_seen = 0; | |
2110 | } | |
2111 | } | |
2112 | ||
2113 | /* now complete the scrub_block items that have all pages completed */ | |
2114 | for (i = 0; i < sbio->page_count; i++) { | |
2115 | struct scrub_page *spage = sbio->pagev[i]; | |
2116 | struct scrub_block *sblock = spage->sblock; | |
2117 | ||
2118 | if (atomic_dec_and_test(&sblock->outstanding_pages)) | |
2119 | scrub_block_complete(sblock); | |
2120 | scrub_block_put(sblock); | |
2121 | } | |
2122 | ||
b5d67f64 SB |
2123 | bio_put(sbio->bio); |
2124 | sbio->bio = NULL; | |
d9d181c1 SB |
2125 | spin_lock(&sctx->list_lock); |
2126 | sbio->next_free = sctx->first_free; | |
2127 | sctx->first_free = sbio->index; | |
2128 | spin_unlock(&sctx->list_lock); | |
ff023aac SB |
2129 | |
2130 | if (sctx->is_dev_replace && | |
2131 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { | |
2132 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2133 | scrub_wr_submit(sctx); | |
2134 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2135 | } | |
2136 | ||
b6bfebc1 | 2137 | scrub_pending_bio_dec(sctx); |
b5d67f64 SB |
2138 | } |
2139 | ||
2140 | static void scrub_block_complete(struct scrub_block *sblock) | |
2141 | { | |
ff023aac | 2142 | if (!sblock->no_io_error_seen) { |
b5d67f64 | 2143 | scrub_handle_errored_block(sblock); |
ff023aac SB |
2144 | } else { |
2145 | /* | |
2146 | * if has checksum error, write via repair mechanism in | |
2147 | * dev replace case, otherwise write here in dev replace | |
2148 | * case. | |
2149 | */ | |
2150 | if (!scrub_checksum(sblock) && sblock->sctx->is_dev_replace) | |
2151 | scrub_write_block_to_dev_replace(sblock); | |
2152 | } | |
b5d67f64 SB |
2153 | } |
2154 | ||
d9d181c1 | 2155 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len, |
a2de733c AJ |
2156 | u8 *csum) |
2157 | { | |
2158 | struct btrfs_ordered_sum *sum = NULL; | |
f51a4a18 | 2159 | unsigned long index; |
a2de733c | 2160 | unsigned long num_sectors; |
a2de733c | 2161 | |
d9d181c1 SB |
2162 | while (!list_empty(&sctx->csum_list)) { |
2163 | sum = list_first_entry(&sctx->csum_list, | |
a2de733c AJ |
2164 | struct btrfs_ordered_sum, list); |
2165 | if (sum->bytenr > logical) | |
2166 | return 0; | |
2167 | if (sum->bytenr + sum->len > logical) | |
2168 | break; | |
2169 | ||
d9d181c1 | 2170 | ++sctx->stat.csum_discards; |
a2de733c AJ |
2171 | list_del(&sum->list); |
2172 | kfree(sum); | |
2173 | sum = NULL; | |
2174 | } | |
2175 | if (!sum) | |
2176 | return 0; | |
2177 | ||
f51a4a18 | 2178 | index = ((u32)(logical - sum->bytenr)) / sctx->sectorsize; |
d9d181c1 | 2179 | num_sectors = sum->len / sctx->sectorsize; |
f51a4a18 MX |
2180 | memcpy(csum, sum->sums + index, sctx->csum_size); |
2181 | if (index == num_sectors - 1) { | |
a2de733c AJ |
2182 | list_del(&sum->list); |
2183 | kfree(sum); | |
2184 | } | |
f51a4a18 | 2185 | return 1; |
a2de733c AJ |
2186 | } |
2187 | ||
2188 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
d9d181c1 | 2189 | static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2190 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac | 2191 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
a2de733c AJ |
2192 | { |
2193 | int ret; | |
2194 | u8 csum[BTRFS_CSUM_SIZE]; | |
b5d67f64 SB |
2195 | u32 blocksize; |
2196 | ||
2197 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
d9d181c1 SB |
2198 | blocksize = sctx->sectorsize; |
2199 | spin_lock(&sctx->stat_lock); | |
2200 | sctx->stat.data_extents_scrubbed++; | |
2201 | sctx->stat.data_bytes_scrubbed += len; | |
2202 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2203 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
d9d181c1 SB |
2204 | blocksize = sctx->nodesize; |
2205 | spin_lock(&sctx->stat_lock); | |
2206 | sctx->stat.tree_extents_scrubbed++; | |
2207 | sctx->stat.tree_bytes_scrubbed += len; | |
2208 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2209 | } else { |
d9d181c1 | 2210 | blocksize = sctx->sectorsize; |
ff023aac | 2211 | WARN_ON(1); |
b5d67f64 | 2212 | } |
a2de733c AJ |
2213 | |
2214 | while (len) { | |
b5d67f64 | 2215 | u64 l = min_t(u64, len, blocksize); |
a2de733c AJ |
2216 | int have_csum = 0; |
2217 | ||
2218 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2219 | /* push csums to sbio */ | |
d9d181c1 | 2220 | have_csum = scrub_find_csum(sctx, logical, l, csum); |
a2de733c | 2221 | if (have_csum == 0) |
d9d181c1 | 2222 | ++sctx->stat.no_csum; |
ff023aac SB |
2223 | if (sctx->is_dev_replace && !have_csum) { |
2224 | ret = copy_nocow_pages(sctx, logical, l, | |
2225 | mirror_num, | |
2226 | physical_for_dev_replace); | |
2227 | goto behind_scrub_pages; | |
2228 | } | |
a2de733c | 2229 | } |
a36cf8b8 | 2230 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
ff023aac SB |
2231 | mirror_num, have_csum ? csum : NULL, 0, |
2232 | physical_for_dev_replace); | |
2233 | behind_scrub_pages: | |
a2de733c AJ |
2234 | if (ret) |
2235 | return ret; | |
2236 | len -= l; | |
2237 | logical += l; | |
2238 | physical += l; | |
ff023aac | 2239 | physical_for_dev_replace += l; |
a2de733c AJ |
2240 | } |
2241 | return 0; | |
2242 | } | |
2243 | ||
3b080b25 WS |
2244 | /* |
2245 | * Given a physical address, this will calculate it's | |
2246 | * logical offset. if this is a parity stripe, it will return | |
2247 | * the most left data stripe's logical offset. | |
2248 | * | |
2249 | * return 0 if it is a data stripe, 1 means parity stripe. | |
2250 | */ | |
2251 | static int get_raid56_logic_offset(u64 physical, int num, | |
2252 | struct map_lookup *map, u64 *offset) | |
2253 | { | |
2254 | int i; | |
2255 | int j = 0; | |
2256 | u64 stripe_nr; | |
2257 | u64 last_offset; | |
2258 | int stripe_index; | |
2259 | int rot; | |
2260 | ||
2261 | last_offset = (physical - map->stripes[num].physical) * | |
2262 | nr_data_stripes(map); | |
2263 | *offset = last_offset; | |
2264 | for (i = 0; i < nr_data_stripes(map); i++) { | |
2265 | *offset = last_offset + i * map->stripe_len; | |
2266 | ||
2267 | stripe_nr = *offset; | |
2268 | do_div(stripe_nr, map->stripe_len); | |
2269 | do_div(stripe_nr, nr_data_stripes(map)); | |
2270 | ||
2271 | /* Work out the disk rotation on this stripe-set */ | |
2272 | rot = do_div(stripe_nr, map->num_stripes); | |
2273 | /* calculate which stripe this data locates */ | |
2274 | rot += i; | |
e4fbaee2 | 2275 | stripe_index = rot % map->num_stripes; |
3b080b25 WS |
2276 | if (stripe_index == num) |
2277 | return 0; | |
2278 | if (stripe_index < num) | |
2279 | j++; | |
2280 | } | |
2281 | *offset = last_offset + j * map->stripe_len; | |
2282 | return 1; | |
2283 | } | |
2284 | ||
d9d181c1 | 2285 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
a36cf8b8 SB |
2286 | struct map_lookup *map, |
2287 | struct btrfs_device *scrub_dev, | |
ff023aac SB |
2288 | int num, u64 base, u64 length, |
2289 | int is_dev_replace) | |
a2de733c AJ |
2290 | { |
2291 | struct btrfs_path *path; | |
a36cf8b8 | 2292 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
a2de733c AJ |
2293 | struct btrfs_root *root = fs_info->extent_root; |
2294 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2295 | struct btrfs_extent_item *extent; | |
e7786c3a | 2296 | struct blk_plug plug; |
a2de733c AJ |
2297 | u64 flags; |
2298 | int ret; | |
2299 | int slot; | |
a2de733c | 2300 | u64 nstripes; |
a2de733c AJ |
2301 | struct extent_buffer *l; |
2302 | struct btrfs_key key; | |
2303 | u64 physical; | |
2304 | u64 logical; | |
625f1c8d | 2305 | u64 logic_end; |
3b080b25 | 2306 | u64 physical_end; |
a2de733c | 2307 | u64 generation; |
e12fa9cd | 2308 | int mirror_num; |
7a26285e AJ |
2309 | struct reada_control *reada1; |
2310 | struct reada_control *reada2; | |
2311 | struct btrfs_key key_start; | |
2312 | struct btrfs_key key_end; | |
a2de733c AJ |
2313 | u64 increment = map->stripe_len; |
2314 | u64 offset; | |
ff023aac SB |
2315 | u64 extent_logical; |
2316 | u64 extent_physical; | |
2317 | u64 extent_len; | |
2318 | struct btrfs_device *extent_dev; | |
2319 | int extent_mirror_num; | |
3b080b25 | 2320 | int stop_loop = 0; |
53b381b3 | 2321 | |
a2de733c | 2322 | nstripes = length; |
3b080b25 | 2323 | physical = map->stripes[num].physical; |
a2de733c AJ |
2324 | offset = 0; |
2325 | do_div(nstripes, map->stripe_len); | |
2326 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
2327 | offset = map->stripe_len * num; | |
2328 | increment = map->stripe_len * map->num_stripes; | |
193ea74b | 2329 | mirror_num = 1; |
a2de733c AJ |
2330 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
2331 | int factor = map->num_stripes / map->sub_stripes; | |
2332 | offset = map->stripe_len * (num / map->sub_stripes); | |
2333 | increment = map->stripe_len * factor; | |
193ea74b | 2334 | mirror_num = num % map->sub_stripes + 1; |
a2de733c AJ |
2335 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
2336 | increment = map->stripe_len; | |
193ea74b | 2337 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
2338 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
2339 | increment = map->stripe_len; | |
193ea74b | 2340 | mirror_num = num % map->num_stripes + 1; |
3b080b25 WS |
2341 | } else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | |
2342 | BTRFS_BLOCK_GROUP_RAID6)) { | |
2343 | get_raid56_logic_offset(physical, num, map, &offset); | |
2344 | increment = map->stripe_len * nr_data_stripes(map); | |
2345 | mirror_num = 1; | |
a2de733c AJ |
2346 | } else { |
2347 | increment = map->stripe_len; | |
193ea74b | 2348 | mirror_num = 1; |
a2de733c AJ |
2349 | } |
2350 | ||
2351 | path = btrfs_alloc_path(); | |
2352 | if (!path) | |
2353 | return -ENOMEM; | |
2354 | ||
b5d67f64 SB |
2355 | /* |
2356 | * work on commit root. The related disk blocks are static as | |
2357 | * long as COW is applied. This means, it is save to rewrite | |
2358 | * them to repair disk errors without any race conditions | |
2359 | */ | |
a2de733c AJ |
2360 | path->search_commit_root = 1; |
2361 | path->skip_locking = 1; | |
2362 | ||
2363 | /* | |
7a26285e AJ |
2364 | * trigger the readahead for extent tree csum tree and wait for |
2365 | * completion. During readahead, the scrub is officially paused | |
2366 | * to not hold off transaction commits | |
a2de733c AJ |
2367 | */ |
2368 | logical = base + offset; | |
3b080b25 WS |
2369 | physical_end = physical + nstripes * map->stripe_len; |
2370 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | | |
2371 | BTRFS_BLOCK_GROUP_RAID6)) { | |
2372 | get_raid56_logic_offset(physical_end, num, | |
2373 | map, &logic_end); | |
2374 | logic_end += base; | |
2375 | } else { | |
2376 | logic_end = logical + increment * nstripes; | |
2377 | } | |
d9d181c1 | 2378 | wait_event(sctx->list_wait, |
b6bfebc1 | 2379 | atomic_read(&sctx->bios_in_flight) == 0); |
cb7ab021 | 2380 | scrub_blocked_if_needed(fs_info); |
7a26285e AJ |
2381 | |
2382 | /* FIXME it might be better to start readahead at commit root */ | |
2383 | key_start.objectid = logical; | |
2384 | key_start.type = BTRFS_EXTENT_ITEM_KEY; | |
2385 | key_start.offset = (u64)0; | |
3b080b25 | 2386 | key_end.objectid = logic_end; |
3173a18f JB |
2387 | key_end.type = BTRFS_METADATA_ITEM_KEY; |
2388 | key_end.offset = (u64)-1; | |
7a26285e AJ |
2389 | reada1 = btrfs_reada_add(root, &key_start, &key_end); |
2390 | ||
2391 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
2392 | key_start.type = BTRFS_EXTENT_CSUM_KEY; | |
2393 | key_start.offset = logical; | |
2394 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
2395 | key_end.type = BTRFS_EXTENT_CSUM_KEY; | |
3b080b25 | 2396 | key_end.offset = logic_end; |
7a26285e AJ |
2397 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); |
2398 | ||
2399 | if (!IS_ERR(reada1)) | |
2400 | btrfs_reada_wait(reada1); | |
2401 | if (!IS_ERR(reada2)) | |
2402 | btrfs_reada_wait(reada2); | |
2403 | ||
a2de733c AJ |
2404 | |
2405 | /* | |
2406 | * collect all data csums for the stripe to avoid seeking during | |
2407 | * the scrub. This might currently (crc32) end up to be about 1MB | |
2408 | */ | |
e7786c3a | 2409 | blk_start_plug(&plug); |
a2de733c | 2410 | |
a2de733c AJ |
2411 | /* |
2412 | * now find all extents for each stripe and scrub them | |
2413 | */ | |
a2de733c | 2414 | ret = 0; |
3b080b25 WS |
2415 | while (physical < physical_end) { |
2416 | /* for raid56, we skip parity stripe */ | |
2417 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | | |
2418 | BTRFS_BLOCK_GROUP_RAID6)) { | |
2419 | ret = get_raid56_logic_offset(physical, num, | |
2420 | map, &logical); | |
2421 | logical += base; | |
2422 | if (ret) | |
2423 | goto skip; | |
2424 | } | |
a2de733c AJ |
2425 | /* |
2426 | * canceled? | |
2427 | */ | |
2428 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
d9d181c1 | 2429 | atomic_read(&sctx->cancel_req)) { |
a2de733c AJ |
2430 | ret = -ECANCELED; |
2431 | goto out; | |
2432 | } | |
2433 | /* | |
2434 | * check to see if we have to pause | |
2435 | */ | |
2436 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
2437 | /* push queued extents */ | |
ff023aac | 2438 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
d9d181c1 | 2439 | scrub_submit(sctx); |
ff023aac SB |
2440 | mutex_lock(&sctx->wr_ctx.wr_lock); |
2441 | scrub_wr_submit(sctx); | |
2442 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
d9d181c1 | 2443 | wait_event(sctx->list_wait, |
b6bfebc1 | 2444 | atomic_read(&sctx->bios_in_flight) == 0); |
ff023aac | 2445 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
3cb0929a | 2446 | scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
2447 | } |
2448 | ||
7c76edb7 WS |
2449 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
2450 | key.type = BTRFS_METADATA_ITEM_KEY; | |
2451 | else | |
2452 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
a2de733c | 2453 | key.objectid = logical; |
625f1c8d | 2454 | key.offset = (u64)-1; |
a2de733c AJ |
2455 | |
2456 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2457 | if (ret < 0) | |
2458 | goto out; | |
3173a18f | 2459 | |
8c51032f | 2460 | if (ret > 0) { |
ade2e0b3 | 2461 | ret = btrfs_previous_extent_item(root, path, 0); |
a2de733c AJ |
2462 | if (ret < 0) |
2463 | goto out; | |
8c51032f AJ |
2464 | if (ret > 0) { |
2465 | /* there's no smaller item, so stick with the | |
2466 | * larger one */ | |
2467 | btrfs_release_path(path); | |
2468 | ret = btrfs_search_slot(NULL, root, &key, | |
2469 | path, 0, 0); | |
2470 | if (ret < 0) | |
2471 | goto out; | |
2472 | } | |
a2de733c AJ |
2473 | } |
2474 | ||
625f1c8d | 2475 | stop_loop = 0; |
a2de733c | 2476 | while (1) { |
3173a18f JB |
2477 | u64 bytes; |
2478 | ||
a2de733c AJ |
2479 | l = path->nodes[0]; |
2480 | slot = path->slots[0]; | |
2481 | if (slot >= btrfs_header_nritems(l)) { | |
2482 | ret = btrfs_next_leaf(root, path); | |
2483 | if (ret == 0) | |
2484 | continue; | |
2485 | if (ret < 0) | |
2486 | goto out; | |
2487 | ||
625f1c8d | 2488 | stop_loop = 1; |
a2de733c AJ |
2489 | break; |
2490 | } | |
2491 | btrfs_item_key_to_cpu(l, &key, slot); | |
2492 | ||
3173a18f | 2493 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
707e8a07 | 2494 | bytes = root->nodesize; |
3173a18f JB |
2495 | else |
2496 | bytes = key.offset; | |
2497 | ||
2498 | if (key.objectid + bytes <= logical) | |
a2de733c AJ |
2499 | goto next; |
2500 | ||
625f1c8d LB |
2501 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
2502 | key.type != BTRFS_METADATA_ITEM_KEY) | |
2503 | goto next; | |
a2de733c | 2504 | |
625f1c8d LB |
2505 | if (key.objectid >= logical + map->stripe_len) { |
2506 | /* out of this device extent */ | |
2507 | if (key.objectid >= logic_end) | |
2508 | stop_loop = 1; | |
2509 | break; | |
2510 | } | |
a2de733c AJ |
2511 | |
2512 | extent = btrfs_item_ptr(l, slot, | |
2513 | struct btrfs_extent_item); | |
2514 | flags = btrfs_extent_flags(l, extent); | |
2515 | generation = btrfs_extent_generation(l, extent); | |
2516 | ||
2517 | if (key.objectid < logical && | |
2518 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { | |
efe120a0 FH |
2519 | btrfs_err(fs_info, |
2520 | "scrub: tree block %llu spanning " | |
2521 | "stripes, ignored. logical=%llu", | |
c1c9ff7c | 2522 | key.objectid, logical); |
a2de733c AJ |
2523 | goto next; |
2524 | } | |
2525 | ||
625f1c8d LB |
2526 | again: |
2527 | extent_logical = key.objectid; | |
2528 | extent_len = bytes; | |
2529 | ||
a2de733c AJ |
2530 | /* |
2531 | * trim extent to this stripe | |
2532 | */ | |
625f1c8d LB |
2533 | if (extent_logical < logical) { |
2534 | extent_len -= logical - extent_logical; | |
2535 | extent_logical = logical; | |
a2de733c | 2536 | } |
625f1c8d | 2537 | if (extent_logical + extent_len > |
a2de733c | 2538 | logical + map->stripe_len) { |
625f1c8d LB |
2539 | extent_len = logical + map->stripe_len - |
2540 | extent_logical; | |
a2de733c AJ |
2541 | } |
2542 | ||
625f1c8d | 2543 | extent_physical = extent_logical - logical + physical; |
ff023aac SB |
2544 | extent_dev = scrub_dev; |
2545 | extent_mirror_num = mirror_num; | |
2546 | if (is_dev_replace) | |
2547 | scrub_remap_extent(fs_info, extent_logical, | |
2548 | extent_len, &extent_physical, | |
2549 | &extent_dev, | |
2550 | &extent_mirror_num); | |
625f1c8d LB |
2551 | |
2552 | ret = btrfs_lookup_csums_range(csum_root, logical, | |
2553 | logical + map->stripe_len - 1, | |
2554 | &sctx->csum_list, 1); | |
2555 | if (ret) | |
2556 | goto out; | |
2557 | ||
ff023aac SB |
2558 | ret = scrub_extent(sctx, extent_logical, extent_len, |
2559 | extent_physical, extent_dev, flags, | |
2560 | generation, extent_mirror_num, | |
115930cb | 2561 | extent_logical - logical + physical); |
a2de733c AJ |
2562 | if (ret) |
2563 | goto out; | |
2564 | ||
d88d46c6 | 2565 | scrub_free_csums(sctx); |
625f1c8d LB |
2566 | if (extent_logical + extent_len < |
2567 | key.objectid + bytes) { | |
3b080b25 WS |
2568 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | |
2569 | BTRFS_BLOCK_GROUP_RAID6)) { | |
2570 | /* | |
2571 | * loop until we find next data stripe | |
2572 | * or we have finished all stripes. | |
2573 | */ | |
2574 | do { | |
2575 | physical += map->stripe_len; | |
2576 | ret = get_raid56_logic_offset( | |
2577 | physical, num, | |
2578 | map, &logical); | |
2579 | logical += base; | |
2580 | } while (physical < physical_end && ret); | |
2581 | } else { | |
2582 | physical += map->stripe_len; | |
2583 | logical += increment; | |
2584 | } | |
625f1c8d LB |
2585 | if (logical < key.objectid + bytes) { |
2586 | cond_resched(); | |
2587 | goto again; | |
2588 | } | |
2589 | ||
3b080b25 | 2590 | if (physical >= physical_end) { |
625f1c8d LB |
2591 | stop_loop = 1; |
2592 | break; | |
2593 | } | |
2594 | } | |
a2de733c AJ |
2595 | next: |
2596 | path->slots[0]++; | |
2597 | } | |
71267333 | 2598 | btrfs_release_path(path); |
3b080b25 | 2599 | skip: |
a2de733c AJ |
2600 | logical += increment; |
2601 | physical += map->stripe_len; | |
d9d181c1 | 2602 | spin_lock(&sctx->stat_lock); |
625f1c8d LB |
2603 | if (stop_loop) |
2604 | sctx->stat.last_physical = map->stripes[num].physical + | |
2605 | length; | |
2606 | else | |
2607 | sctx->stat.last_physical = physical; | |
d9d181c1 | 2608 | spin_unlock(&sctx->stat_lock); |
625f1c8d LB |
2609 | if (stop_loop) |
2610 | break; | |
a2de733c | 2611 | } |
ff023aac | 2612 | out: |
a2de733c | 2613 | /* push queued extents */ |
d9d181c1 | 2614 | scrub_submit(sctx); |
ff023aac SB |
2615 | mutex_lock(&sctx->wr_ctx.wr_lock); |
2616 | scrub_wr_submit(sctx); | |
2617 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
a2de733c | 2618 | |
e7786c3a | 2619 | blk_finish_plug(&plug); |
a2de733c AJ |
2620 | btrfs_free_path(path); |
2621 | return ret < 0 ? ret : 0; | |
2622 | } | |
2623 | ||
d9d181c1 | 2624 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
a36cf8b8 SB |
2625 | struct btrfs_device *scrub_dev, |
2626 | u64 chunk_tree, u64 chunk_objectid, | |
2627 | u64 chunk_offset, u64 length, | |
ff023aac | 2628 | u64 dev_offset, int is_dev_replace) |
a2de733c AJ |
2629 | { |
2630 | struct btrfs_mapping_tree *map_tree = | |
a36cf8b8 | 2631 | &sctx->dev_root->fs_info->mapping_tree; |
a2de733c AJ |
2632 | struct map_lookup *map; |
2633 | struct extent_map *em; | |
2634 | int i; | |
ff023aac | 2635 | int ret = 0; |
a2de733c AJ |
2636 | |
2637 | read_lock(&map_tree->map_tree.lock); | |
2638 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | |
2639 | read_unlock(&map_tree->map_tree.lock); | |
2640 | ||
2641 | if (!em) | |
2642 | return -EINVAL; | |
2643 | ||
2644 | map = (struct map_lookup *)em->bdev; | |
2645 | if (em->start != chunk_offset) | |
2646 | goto out; | |
2647 | ||
2648 | if (em->len < length) | |
2649 | goto out; | |
2650 | ||
2651 | for (i = 0; i < map->num_stripes; ++i) { | |
a36cf8b8 | 2652 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
859acaf1 | 2653 | map->stripes[i].physical == dev_offset) { |
a36cf8b8 | 2654 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
ff023aac SB |
2655 | chunk_offset, length, |
2656 | is_dev_replace); | |
a2de733c AJ |
2657 | if (ret) |
2658 | goto out; | |
2659 | } | |
2660 | } | |
2661 | out: | |
2662 | free_extent_map(em); | |
2663 | ||
2664 | return ret; | |
2665 | } | |
2666 | ||
2667 | static noinline_for_stack | |
a36cf8b8 | 2668 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
ff023aac SB |
2669 | struct btrfs_device *scrub_dev, u64 start, u64 end, |
2670 | int is_dev_replace) | |
a2de733c AJ |
2671 | { |
2672 | struct btrfs_dev_extent *dev_extent = NULL; | |
2673 | struct btrfs_path *path; | |
a36cf8b8 | 2674 | struct btrfs_root *root = sctx->dev_root; |
a2de733c AJ |
2675 | struct btrfs_fs_info *fs_info = root->fs_info; |
2676 | u64 length; | |
2677 | u64 chunk_tree; | |
2678 | u64 chunk_objectid; | |
2679 | u64 chunk_offset; | |
2680 | int ret; | |
2681 | int slot; | |
2682 | struct extent_buffer *l; | |
2683 | struct btrfs_key key; | |
2684 | struct btrfs_key found_key; | |
2685 | struct btrfs_block_group_cache *cache; | |
ff023aac | 2686 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
a2de733c AJ |
2687 | |
2688 | path = btrfs_alloc_path(); | |
2689 | if (!path) | |
2690 | return -ENOMEM; | |
2691 | ||
2692 | path->reada = 2; | |
2693 | path->search_commit_root = 1; | |
2694 | path->skip_locking = 1; | |
2695 | ||
a36cf8b8 | 2696 | key.objectid = scrub_dev->devid; |
a2de733c AJ |
2697 | key.offset = 0ull; |
2698 | key.type = BTRFS_DEV_EXTENT_KEY; | |
2699 | ||
a2de733c AJ |
2700 | while (1) { |
2701 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2702 | if (ret < 0) | |
8c51032f AJ |
2703 | break; |
2704 | if (ret > 0) { | |
2705 | if (path->slots[0] >= | |
2706 | btrfs_header_nritems(path->nodes[0])) { | |
2707 | ret = btrfs_next_leaf(root, path); | |
2708 | if (ret) | |
2709 | break; | |
2710 | } | |
2711 | } | |
a2de733c AJ |
2712 | |
2713 | l = path->nodes[0]; | |
2714 | slot = path->slots[0]; | |
2715 | ||
2716 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
2717 | ||
a36cf8b8 | 2718 | if (found_key.objectid != scrub_dev->devid) |
a2de733c AJ |
2719 | break; |
2720 | ||
962a298f | 2721 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) |
a2de733c AJ |
2722 | break; |
2723 | ||
2724 | if (found_key.offset >= end) | |
2725 | break; | |
2726 | ||
2727 | if (found_key.offset < key.offset) | |
2728 | break; | |
2729 | ||
2730 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
2731 | length = btrfs_dev_extent_length(l, dev_extent); | |
2732 | ||
ced96edc QW |
2733 | if (found_key.offset + length <= start) |
2734 | goto skip; | |
a2de733c AJ |
2735 | |
2736 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
2737 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
2738 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
2739 | ||
2740 | /* | |
2741 | * get a reference on the corresponding block group to prevent | |
2742 | * the chunk from going away while we scrub it | |
2743 | */ | |
2744 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
ced96edc QW |
2745 | |
2746 | /* some chunks are removed but not committed to disk yet, | |
2747 | * continue scrubbing */ | |
2748 | if (!cache) | |
2749 | goto skip; | |
2750 | ||
ff023aac SB |
2751 | dev_replace->cursor_right = found_key.offset + length; |
2752 | dev_replace->cursor_left = found_key.offset; | |
2753 | dev_replace->item_needs_writeback = 1; | |
a36cf8b8 | 2754 | ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid, |
ff023aac SB |
2755 | chunk_offset, length, found_key.offset, |
2756 | is_dev_replace); | |
2757 | ||
2758 | /* | |
2759 | * flush, submit all pending read and write bios, afterwards | |
2760 | * wait for them. | |
2761 | * Note that in the dev replace case, a read request causes | |
2762 | * write requests that are submitted in the read completion | |
2763 | * worker. Therefore in the current situation, it is required | |
2764 | * that all write requests are flushed, so that all read and | |
2765 | * write requests are really completed when bios_in_flight | |
2766 | * changes to 0. | |
2767 | */ | |
2768 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); | |
2769 | scrub_submit(sctx); | |
2770 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2771 | scrub_wr_submit(sctx); | |
2772 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2773 | ||
2774 | wait_event(sctx->list_wait, | |
2775 | atomic_read(&sctx->bios_in_flight) == 0); | |
12cf9372 WS |
2776 | atomic_inc(&fs_info->scrubs_paused); |
2777 | wake_up(&fs_info->scrub_pause_wait); | |
2778 | ||
2779 | /* | |
2780 | * must be called before we decrease @scrub_paused. | |
2781 | * make sure we don't block transaction commit while | |
2782 | * we are waiting pending workers finished. | |
2783 | */ | |
ff023aac SB |
2784 | wait_event(sctx->list_wait, |
2785 | atomic_read(&sctx->workers_pending) == 0); | |
12cf9372 WS |
2786 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
2787 | ||
2788 | mutex_lock(&fs_info->scrub_lock); | |
2789 | __scrub_blocked_if_needed(fs_info); | |
2790 | atomic_dec(&fs_info->scrubs_paused); | |
2791 | mutex_unlock(&fs_info->scrub_lock); | |
2792 | wake_up(&fs_info->scrub_pause_wait); | |
ff023aac | 2793 | |
a2de733c AJ |
2794 | btrfs_put_block_group(cache); |
2795 | if (ret) | |
2796 | break; | |
af1be4f8 SB |
2797 | if (is_dev_replace && |
2798 | atomic64_read(&dev_replace->num_write_errors) > 0) { | |
ff023aac SB |
2799 | ret = -EIO; |
2800 | break; | |
2801 | } | |
2802 | if (sctx->stat.malloc_errors > 0) { | |
2803 | ret = -ENOMEM; | |
2804 | break; | |
2805 | } | |
a2de733c | 2806 | |
539f358a ID |
2807 | dev_replace->cursor_left = dev_replace->cursor_right; |
2808 | dev_replace->item_needs_writeback = 1; | |
ced96edc | 2809 | skip: |
a2de733c | 2810 | key.offset = found_key.offset + length; |
71267333 | 2811 | btrfs_release_path(path); |
a2de733c AJ |
2812 | } |
2813 | ||
a2de733c | 2814 | btrfs_free_path(path); |
8c51032f AJ |
2815 | |
2816 | /* | |
2817 | * ret can still be 1 from search_slot or next_leaf, | |
2818 | * that's not an error | |
2819 | */ | |
2820 | return ret < 0 ? ret : 0; | |
a2de733c AJ |
2821 | } |
2822 | ||
a36cf8b8 SB |
2823 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
2824 | struct btrfs_device *scrub_dev) | |
a2de733c AJ |
2825 | { |
2826 | int i; | |
2827 | u64 bytenr; | |
2828 | u64 gen; | |
2829 | int ret; | |
a36cf8b8 | 2830 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 2831 | |
87533c47 | 2832 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
79787eaa JM |
2833 | return -EIO; |
2834 | ||
5f546063 MX |
2835 | /* Seed devices of a new filesystem has their own generation. */ |
2836 | if (scrub_dev->fs_devices != root->fs_info->fs_devices) | |
2837 | gen = scrub_dev->generation; | |
2838 | else | |
2839 | gen = root->fs_info->last_trans_committed; | |
a2de733c AJ |
2840 | |
2841 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
2842 | bytenr = btrfs_sb_offset(i); | |
935e5cc9 MX |
2843 | if (bytenr + BTRFS_SUPER_INFO_SIZE > |
2844 | scrub_dev->commit_total_bytes) | |
a2de733c AJ |
2845 | break; |
2846 | ||
d9d181c1 | 2847 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
a36cf8b8 | 2848 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
ff023aac | 2849 | NULL, 1, bytenr); |
a2de733c AJ |
2850 | if (ret) |
2851 | return ret; | |
2852 | } | |
b6bfebc1 | 2853 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
2854 | |
2855 | return 0; | |
2856 | } | |
2857 | ||
2858 | /* | |
2859 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
2860 | */ | |
ff023aac SB |
2861 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
2862 | int is_dev_replace) | |
a2de733c | 2863 | { |
0dc3b84a | 2864 | int ret = 0; |
0339ef2f QW |
2865 | int flags = WQ_FREEZABLE | WQ_UNBOUND; |
2866 | int max_active = fs_info->thread_pool_size; | |
a2de733c | 2867 | |
632dd772 | 2868 | if (fs_info->scrub_workers_refcnt == 0) { |
ff023aac | 2869 | if (is_dev_replace) |
0339ef2f QW |
2870 | fs_info->scrub_workers = |
2871 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
2872 | 1, 4); | |
ff023aac | 2873 | else |
0339ef2f QW |
2874 | fs_info->scrub_workers = |
2875 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
2876 | max_active, 4); | |
2877 | if (!fs_info->scrub_workers) { | |
2878 | ret = -ENOMEM; | |
0dc3b84a | 2879 | goto out; |
0339ef2f QW |
2880 | } |
2881 | fs_info->scrub_wr_completion_workers = | |
2882 | btrfs_alloc_workqueue("btrfs-scrubwrc", flags, | |
2883 | max_active, 2); | |
2884 | if (!fs_info->scrub_wr_completion_workers) { | |
2885 | ret = -ENOMEM; | |
ff023aac | 2886 | goto out; |
0339ef2f QW |
2887 | } |
2888 | fs_info->scrub_nocow_workers = | |
2889 | btrfs_alloc_workqueue("btrfs-scrubnc", flags, 1, 0); | |
2890 | if (!fs_info->scrub_nocow_workers) { | |
2891 | ret = -ENOMEM; | |
ff023aac | 2892 | goto out; |
0339ef2f | 2893 | } |
632dd772 | 2894 | } |
a2de733c | 2895 | ++fs_info->scrub_workers_refcnt; |
0dc3b84a | 2896 | out: |
0dc3b84a | 2897 | return ret; |
a2de733c AJ |
2898 | } |
2899 | ||
aa1b8cd4 | 2900 | static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info) |
a2de733c | 2901 | { |
ff023aac | 2902 | if (--fs_info->scrub_workers_refcnt == 0) { |
0339ef2f QW |
2903 | btrfs_destroy_workqueue(fs_info->scrub_workers); |
2904 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); | |
2905 | btrfs_destroy_workqueue(fs_info->scrub_nocow_workers); | |
ff023aac | 2906 | } |
a2de733c | 2907 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
a2de733c AJ |
2908 | } |
2909 | ||
aa1b8cd4 SB |
2910 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
2911 | u64 end, struct btrfs_scrub_progress *progress, | |
63a212ab | 2912 | int readonly, int is_dev_replace) |
a2de733c | 2913 | { |
d9d181c1 | 2914 | struct scrub_ctx *sctx; |
a2de733c AJ |
2915 | int ret; |
2916 | struct btrfs_device *dev; | |
5d68da3b | 2917 | struct rcu_string *name; |
a2de733c | 2918 | |
aa1b8cd4 | 2919 | if (btrfs_fs_closing(fs_info)) |
a2de733c AJ |
2920 | return -EINVAL; |
2921 | ||
aa1b8cd4 | 2922 | if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) { |
b5d67f64 SB |
2923 | /* |
2924 | * in this case scrub is unable to calculate the checksum | |
2925 | * the way scrub is implemented. Do not handle this | |
2926 | * situation at all because it won't ever happen. | |
2927 | */ | |
efe120a0 FH |
2928 | btrfs_err(fs_info, |
2929 | "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails", | |
aa1b8cd4 | 2930 | fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN); |
b5d67f64 SB |
2931 | return -EINVAL; |
2932 | } | |
2933 | ||
aa1b8cd4 | 2934 | if (fs_info->chunk_root->sectorsize != PAGE_SIZE) { |
b5d67f64 | 2935 | /* not supported for data w/o checksums */ |
efe120a0 FH |
2936 | btrfs_err(fs_info, |
2937 | "scrub: size assumption sectorsize != PAGE_SIZE " | |
2938 | "(%d != %lu) fails", | |
27f9f023 | 2939 | fs_info->chunk_root->sectorsize, PAGE_SIZE); |
a2de733c AJ |
2940 | return -EINVAL; |
2941 | } | |
2942 | ||
7a9e9987 SB |
2943 | if (fs_info->chunk_root->nodesize > |
2944 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || | |
2945 | fs_info->chunk_root->sectorsize > | |
2946 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { | |
2947 | /* | |
2948 | * would exhaust the array bounds of pagev member in | |
2949 | * struct scrub_block | |
2950 | */ | |
efe120a0 FH |
2951 | btrfs_err(fs_info, "scrub: size assumption nodesize and sectorsize " |
2952 | "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails", | |
7a9e9987 SB |
2953 | fs_info->chunk_root->nodesize, |
2954 | SCRUB_MAX_PAGES_PER_BLOCK, | |
2955 | fs_info->chunk_root->sectorsize, | |
2956 | SCRUB_MAX_PAGES_PER_BLOCK); | |
2957 | return -EINVAL; | |
2958 | } | |
2959 | ||
a2de733c | 2960 | |
aa1b8cd4 SB |
2961 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
2962 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); | |
63a212ab | 2963 | if (!dev || (dev->missing && !is_dev_replace)) { |
aa1b8cd4 | 2964 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
2965 | return -ENODEV; |
2966 | } | |
a2de733c | 2967 | |
5d68da3b MX |
2968 | if (!is_dev_replace && !readonly && !dev->writeable) { |
2969 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
2970 | rcu_read_lock(); | |
2971 | name = rcu_dereference(dev->name); | |
2972 | btrfs_err(fs_info, "scrub: device %s is not writable", | |
2973 | name->str); | |
2974 | rcu_read_unlock(); | |
2975 | return -EROFS; | |
2976 | } | |
2977 | ||
3b7a016f | 2978 | mutex_lock(&fs_info->scrub_lock); |
63a212ab | 2979 | if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) { |
a2de733c | 2980 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 2981 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
aa1b8cd4 | 2982 | return -EIO; |
a2de733c AJ |
2983 | } |
2984 | ||
8dabb742 SB |
2985 | btrfs_dev_replace_lock(&fs_info->dev_replace); |
2986 | if (dev->scrub_device || | |
2987 | (!is_dev_replace && | |
2988 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { | |
2989 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
a2de733c | 2990 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 2991 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
2992 | return -EINPROGRESS; |
2993 | } | |
8dabb742 | 2994 | btrfs_dev_replace_unlock(&fs_info->dev_replace); |
3b7a016f WS |
2995 | |
2996 | ret = scrub_workers_get(fs_info, is_dev_replace); | |
2997 | if (ret) { | |
2998 | mutex_unlock(&fs_info->scrub_lock); | |
2999 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
3000 | return ret; | |
3001 | } | |
3002 | ||
63a212ab | 3003 | sctx = scrub_setup_ctx(dev, is_dev_replace); |
d9d181c1 | 3004 | if (IS_ERR(sctx)) { |
a2de733c | 3005 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 SB |
3006 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
3007 | scrub_workers_put(fs_info); | |
d9d181c1 | 3008 | return PTR_ERR(sctx); |
a2de733c | 3009 | } |
d9d181c1 SB |
3010 | sctx->readonly = readonly; |
3011 | dev->scrub_device = sctx; | |
3cb0929a | 3012 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 3013 | |
3cb0929a WS |
3014 | /* |
3015 | * checking @scrub_pause_req here, we can avoid | |
3016 | * race between committing transaction and scrubbing. | |
3017 | */ | |
cb7ab021 | 3018 | __scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
3019 | atomic_inc(&fs_info->scrubs_running); |
3020 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c | 3021 | |
ff023aac | 3022 | if (!is_dev_replace) { |
9b011adf WS |
3023 | /* |
3024 | * by holding device list mutex, we can | |
3025 | * kick off writing super in log tree sync. | |
3026 | */ | |
3cb0929a | 3027 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3028 | ret = scrub_supers(sctx, dev); |
3cb0929a | 3029 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 3030 | } |
a2de733c AJ |
3031 | |
3032 | if (!ret) | |
ff023aac SB |
3033 | ret = scrub_enumerate_chunks(sctx, dev, start, end, |
3034 | is_dev_replace); | |
a2de733c | 3035 | |
b6bfebc1 | 3036 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
3037 | atomic_dec(&fs_info->scrubs_running); |
3038 | wake_up(&fs_info->scrub_pause_wait); | |
3039 | ||
b6bfebc1 | 3040 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
0ef8e451 | 3041 | |
a2de733c | 3042 | if (progress) |
d9d181c1 | 3043 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
a2de733c AJ |
3044 | |
3045 | mutex_lock(&fs_info->scrub_lock); | |
3046 | dev->scrub_device = NULL; | |
3b7a016f | 3047 | scrub_workers_put(fs_info); |
a2de733c AJ |
3048 | mutex_unlock(&fs_info->scrub_lock); |
3049 | ||
d9d181c1 | 3050 | scrub_free_ctx(sctx); |
a2de733c AJ |
3051 | |
3052 | return ret; | |
3053 | } | |
3054 | ||
143bede5 | 3055 | void btrfs_scrub_pause(struct btrfs_root *root) |
a2de733c AJ |
3056 | { |
3057 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3058 | ||
3059 | mutex_lock(&fs_info->scrub_lock); | |
3060 | atomic_inc(&fs_info->scrub_pause_req); | |
3061 | while (atomic_read(&fs_info->scrubs_paused) != | |
3062 | atomic_read(&fs_info->scrubs_running)) { | |
3063 | mutex_unlock(&fs_info->scrub_lock); | |
3064 | wait_event(fs_info->scrub_pause_wait, | |
3065 | atomic_read(&fs_info->scrubs_paused) == | |
3066 | atomic_read(&fs_info->scrubs_running)); | |
3067 | mutex_lock(&fs_info->scrub_lock); | |
3068 | } | |
3069 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c AJ |
3070 | } |
3071 | ||
143bede5 | 3072 | void btrfs_scrub_continue(struct btrfs_root *root) |
a2de733c AJ |
3073 | { |
3074 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3075 | ||
3076 | atomic_dec(&fs_info->scrub_pause_req); | |
3077 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
3078 | } |
3079 | ||
aa1b8cd4 | 3080 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
a2de733c | 3081 | { |
a2de733c AJ |
3082 | mutex_lock(&fs_info->scrub_lock); |
3083 | if (!atomic_read(&fs_info->scrubs_running)) { | |
3084 | mutex_unlock(&fs_info->scrub_lock); | |
3085 | return -ENOTCONN; | |
3086 | } | |
3087 | ||
3088 | atomic_inc(&fs_info->scrub_cancel_req); | |
3089 | while (atomic_read(&fs_info->scrubs_running)) { | |
3090 | mutex_unlock(&fs_info->scrub_lock); | |
3091 | wait_event(fs_info->scrub_pause_wait, | |
3092 | atomic_read(&fs_info->scrubs_running) == 0); | |
3093 | mutex_lock(&fs_info->scrub_lock); | |
3094 | } | |
3095 | atomic_dec(&fs_info->scrub_cancel_req); | |
3096 | mutex_unlock(&fs_info->scrub_lock); | |
3097 | ||
3098 | return 0; | |
3099 | } | |
3100 | ||
aa1b8cd4 SB |
3101 | int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info, |
3102 | struct btrfs_device *dev) | |
49b25e05 | 3103 | { |
d9d181c1 | 3104 | struct scrub_ctx *sctx; |
a2de733c AJ |
3105 | |
3106 | mutex_lock(&fs_info->scrub_lock); | |
d9d181c1 SB |
3107 | sctx = dev->scrub_device; |
3108 | if (!sctx) { | |
a2de733c AJ |
3109 | mutex_unlock(&fs_info->scrub_lock); |
3110 | return -ENOTCONN; | |
3111 | } | |
d9d181c1 | 3112 | atomic_inc(&sctx->cancel_req); |
a2de733c AJ |
3113 | while (dev->scrub_device) { |
3114 | mutex_unlock(&fs_info->scrub_lock); | |
3115 | wait_event(fs_info->scrub_pause_wait, | |
3116 | dev->scrub_device == NULL); | |
3117 | mutex_lock(&fs_info->scrub_lock); | |
3118 | } | |
3119 | mutex_unlock(&fs_info->scrub_lock); | |
3120 | ||
3121 | return 0; | |
3122 | } | |
1623edeb | 3123 | |
a2de733c AJ |
3124 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, |
3125 | struct btrfs_scrub_progress *progress) | |
3126 | { | |
3127 | struct btrfs_device *dev; | |
d9d181c1 | 3128 | struct scrub_ctx *sctx = NULL; |
a2de733c AJ |
3129 | |
3130 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
aa1b8cd4 | 3131 | dev = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
a2de733c | 3132 | if (dev) |
d9d181c1 SB |
3133 | sctx = dev->scrub_device; |
3134 | if (sctx) | |
3135 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
a2de733c AJ |
3136 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
3137 | ||
d9d181c1 | 3138 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
a2de733c | 3139 | } |
ff023aac SB |
3140 | |
3141 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
3142 | u64 extent_logical, u64 extent_len, | |
3143 | u64 *extent_physical, | |
3144 | struct btrfs_device **extent_dev, | |
3145 | int *extent_mirror_num) | |
3146 | { | |
3147 | u64 mapped_length; | |
3148 | struct btrfs_bio *bbio = NULL; | |
3149 | int ret; | |
3150 | ||
3151 | mapped_length = extent_len; | |
3152 | ret = btrfs_map_block(fs_info, READ, extent_logical, | |
3153 | &mapped_length, &bbio, 0); | |
3154 | if (ret || !bbio || mapped_length < extent_len || | |
3155 | !bbio->stripes[0].dev->bdev) { | |
3156 | kfree(bbio); | |
3157 | return; | |
3158 | } | |
3159 | ||
3160 | *extent_physical = bbio->stripes[0].physical; | |
3161 | *extent_mirror_num = bbio->mirror_num; | |
3162 | *extent_dev = bbio->stripes[0].dev; | |
3163 | kfree(bbio); | |
3164 | } | |
3165 | ||
3166 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
3167 | struct scrub_wr_ctx *wr_ctx, | |
3168 | struct btrfs_fs_info *fs_info, | |
3169 | struct btrfs_device *dev, | |
3170 | int is_dev_replace) | |
3171 | { | |
3172 | WARN_ON(wr_ctx->wr_curr_bio != NULL); | |
3173 | ||
3174 | mutex_init(&wr_ctx->wr_lock); | |
3175 | wr_ctx->wr_curr_bio = NULL; | |
3176 | if (!is_dev_replace) | |
3177 | return 0; | |
3178 | ||
3179 | WARN_ON(!dev->bdev); | |
3180 | wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO, | |
3181 | bio_get_nr_vecs(dev->bdev)); | |
3182 | wr_ctx->tgtdev = dev; | |
3183 | atomic_set(&wr_ctx->flush_all_writes, 0); | |
3184 | return 0; | |
3185 | } | |
3186 | ||
3187 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx) | |
3188 | { | |
3189 | mutex_lock(&wr_ctx->wr_lock); | |
3190 | kfree(wr_ctx->wr_curr_bio); | |
3191 | wr_ctx->wr_curr_bio = NULL; | |
3192 | mutex_unlock(&wr_ctx->wr_lock); | |
3193 | } | |
3194 | ||
3195 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, | |
3196 | int mirror_num, u64 physical_for_dev_replace) | |
3197 | { | |
3198 | struct scrub_copy_nocow_ctx *nocow_ctx; | |
3199 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
3200 | ||
3201 | nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS); | |
3202 | if (!nocow_ctx) { | |
3203 | spin_lock(&sctx->stat_lock); | |
3204 | sctx->stat.malloc_errors++; | |
3205 | spin_unlock(&sctx->stat_lock); | |
3206 | return -ENOMEM; | |
3207 | } | |
3208 | ||
3209 | scrub_pending_trans_workers_inc(sctx); | |
3210 | ||
3211 | nocow_ctx->sctx = sctx; | |
3212 | nocow_ctx->logical = logical; | |
3213 | nocow_ctx->len = len; | |
3214 | nocow_ctx->mirror_num = mirror_num; | |
3215 | nocow_ctx->physical_for_dev_replace = physical_for_dev_replace; | |
9e0af237 LB |
3216 | btrfs_init_work(&nocow_ctx->work, btrfs_scrubnc_helper, |
3217 | copy_nocow_pages_worker, NULL, NULL); | |
652f25a2 | 3218 | INIT_LIST_HEAD(&nocow_ctx->inodes); |
0339ef2f QW |
3219 | btrfs_queue_work(fs_info->scrub_nocow_workers, |
3220 | &nocow_ctx->work); | |
ff023aac SB |
3221 | |
3222 | return 0; | |
3223 | } | |
3224 | ||
652f25a2 JB |
3225 | static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx) |
3226 | { | |
3227 | struct scrub_copy_nocow_ctx *nocow_ctx = ctx; | |
3228 | struct scrub_nocow_inode *nocow_inode; | |
3229 | ||
3230 | nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS); | |
3231 | if (!nocow_inode) | |
3232 | return -ENOMEM; | |
3233 | nocow_inode->inum = inum; | |
3234 | nocow_inode->offset = offset; | |
3235 | nocow_inode->root = root; | |
3236 | list_add_tail(&nocow_inode->list, &nocow_ctx->inodes); | |
3237 | return 0; | |
3238 | } | |
3239 | ||
3240 | #define COPY_COMPLETE 1 | |
3241 | ||
ff023aac SB |
3242 | static void copy_nocow_pages_worker(struct btrfs_work *work) |
3243 | { | |
3244 | struct scrub_copy_nocow_ctx *nocow_ctx = | |
3245 | container_of(work, struct scrub_copy_nocow_ctx, work); | |
3246 | struct scrub_ctx *sctx = nocow_ctx->sctx; | |
3247 | u64 logical = nocow_ctx->logical; | |
3248 | u64 len = nocow_ctx->len; | |
3249 | int mirror_num = nocow_ctx->mirror_num; | |
3250 | u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; | |
3251 | int ret; | |
3252 | struct btrfs_trans_handle *trans = NULL; | |
3253 | struct btrfs_fs_info *fs_info; | |
3254 | struct btrfs_path *path; | |
3255 | struct btrfs_root *root; | |
3256 | int not_written = 0; | |
3257 | ||
3258 | fs_info = sctx->dev_root->fs_info; | |
3259 | root = fs_info->extent_root; | |
3260 | ||
3261 | path = btrfs_alloc_path(); | |
3262 | if (!path) { | |
3263 | spin_lock(&sctx->stat_lock); | |
3264 | sctx->stat.malloc_errors++; | |
3265 | spin_unlock(&sctx->stat_lock); | |
3266 | not_written = 1; | |
3267 | goto out; | |
3268 | } | |
3269 | ||
3270 | trans = btrfs_join_transaction(root); | |
3271 | if (IS_ERR(trans)) { | |
3272 | not_written = 1; | |
3273 | goto out; | |
3274 | } | |
3275 | ||
3276 | ret = iterate_inodes_from_logical(logical, fs_info, path, | |
652f25a2 | 3277 | record_inode_for_nocow, nocow_ctx); |
ff023aac | 3278 | if (ret != 0 && ret != -ENOENT) { |
efe120a0 FH |
3279 | btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, " |
3280 | "phys %llu, len %llu, mir %u, ret %d", | |
118a0a25 GU |
3281 | logical, physical_for_dev_replace, len, mirror_num, |
3282 | ret); | |
ff023aac SB |
3283 | not_written = 1; |
3284 | goto out; | |
3285 | } | |
3286 | ||
652f25a2 JB |
3287 | btrfs_end_transaction(trans, root); |
3288 | trans = NULL; | |
3289 | while (!list_empty(&nocow_ctx->inodes)) { | |
3290 | struct scrub_nocow_inode *entry; | |
3291 | entry = list_first_entry(&nocow_ctx->inodes, | |
3292 | struct scrub_nocow_inode, | |
3293 | list); | |
3294 | list_del_init(&entry->list); | |
3295 | ret = copy_nocow_pages_for_inode(entry->inum, entry->offset, | |
3296 | entry->root, nocow_ctx); | |
3297 | kfree(entry); | |
3298 | if (ret == COPY_COMPLETE) { | |
3299 | ret = 0; | |
3300 | break; | |
3301 | } else if (ret) { | |
3302 | break; | |
3303 | } | |
3304 | } | |
ff023aac | 3305 | out: |
652f25a2 JB |
3306 | while (!list_empty(&nocow_ctx->inodes)) { |
3307 | struct scrub_nocow_inode *entry; | |
3308 | entry = list_first_entry(&nocow_ctx->inodes, | |
3309 | struct scrub_nocow_inode, | |
3310 | list); | |
3311 | list_del_init(&entry->list); | |
3312 | kfree(entry); | |
3313 | } | |
ff023aac SB |
3314 | if (trans && !IS_ERR(trans)) |
3315 | btrfs_end_transaction(trans, root); | |
3316 | if (not_written) | |
3317 | btrfs_dev_replace_stats_inc(&fs_info->dev_replace. | |
3318 | num_uncorrectable_read_errors); | |
3319 | ||
3320 | btrfs_free_path(path); | |
3321 | kfree(nocow_ctx); | |
3322 | ||
3323 | scrub_pending_trans_workers_dec(sctx); | |
3324 | } | |
3325 | ||
652f25a2 JB |
3326 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, |
3327 | struct scrub_copy_nocow_ctx *nocow_ctx) | |
ff023aac | 3328 | { |
826aa0a8 | 3329 | struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info; |
ff023aac | 3330 | struct btrfs_key key; |
826aa0a8 MX |
3331 | struct inode *inode; |
3332 | struct page *page; | |
ff023aac | 3333 | struct btrfs_root *local_root; |
652f25a2 JB |
3334 | struct btrfs_ordered_extent *ordered; |
3335 | struct extent_map *em; | |
3336 | struct extent_state *cached_state = NULL; | |
3337 | struct extent_io_tree *io_tree; | |
ff023aac | 3338 | u64 physical_for_dev_replace; |
652f25a2 JB |
3339 | u64 len = nocow_ctx->len; |
3340 | u64 lockstart = offset, lockend = offset + len - 1; | |
826aa0a8 | 3341 | unsigned long index; |
6f1c3605 | 3342 | int srcu_index; |
652f25a2 JB |
3343 | int ret = 0; |
3344 | int err = 0; | |
ff023aac SB |
3345 | |
3346 | key.objectid = root; | |
3347 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3348 | key.offset = (u64)-1; | |
6f1c3605 LB |
3349 | |
3350 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
3351 | ||
ff023aac | 3352 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); |
6f1c3605 LB |
3353 | if (IS_ERR(local_root)) { |
3354 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
ff023aac | 3355 | return PTR_ERR(local_root); |
6f1c3605 | 3356 | } |
ff023aac SB |
3357 | |
3358 | key.type = BTRFS_INODE_ITEM_KEY; | |
3359 | key.objectid = inum; | |
3360 | key.offset = 0; | |
3361 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); | |
6f1c3605 | 3362 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
ff023aac SB |
3363 | if (IS_ERR(inode)) |
3364 | return PTR_ERR(inode); | |
3365 | ||
edd1400b MX |
3366 | /* Avoid truncate/dio/punch hole.. */ |
3367 | mutex_lock(&inode->i_mutex); | |
3368 | inode_dio_wait(inode); | |
3369 | ||
ff023aac | 3370 | physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; |
652f25a2 JB |
3371 | io_tree = &BTRFS_I(inode)->io_tree; |
3372 | ||
3373 | lock_extent_bits(io_tree, lockstart, lockend, 0, &cached_state); | |
3374 | ordered = btrfs_lookup_ordered_range(inode, lockstart, len); | |
3375 | if (ordered) { | |
3376 | btrfs_put_ordered_extent(ordered); | |
3377 | goto out_unlock; | |
3378 | } | |
3379 | ||
3380 | em = btrfs_get_extent(inode, NULL, 0, lockstart, len, 0); | |
3381 | if (IS_ERR(em)) { | |
3382 | ret = PTR_ERR(em); | |
3383 | goto out_unlock; | |
3384 | } | |
3385 | ||
3386 | /* | |
3387 | * This extent does not actually cover the logical extent anymore, | |
3388 | * move on to the next inode. | |
3389 | */ | |
3390 | if (em->block_start > nocow_ctx->logical || | |
3391 | em->block_start + em->block_len < nocow_ctx->logical + len) { | |
3392 | free_extent_map(em); | |
3393 | goto out_unlock; | |
3394 | } | |
3395 | free_extent_map(em); | |
3396 | ||
ff023aac | 3397 | while (len >= PAGE_CACHE_SIZE) { |
ff023aac | 3398 | index = offset >> PAGE_CACHE_SHIFT; |
edd1400b | 3399 | again: |
ff023aac SB |
3400 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
3401 | if (!page) { | |
efe120a0 | 3402 | btrfs_err(fs_info, "find_or_create_page() failed"); |
ff023aac | 3403 | ret = -ENOMEM; |
826aa0a8 | 3404 | goto out; |
ff023aac SB |
3405 | } |
3406 | ||
3407 | if (PageUptodate(page)) { | |
3408 | if (PageDirty(page)) | |
3409 | goto next_page; | |
3410 | } else { | |
3411 | ClearPageError(page); | |
652f25a2 JB |
3412 | err = extent_read_full_page_nolock(io_tree, page, |
3413 | btrfs_get_extent, | |
3414 | nocow_ctx->mirror_num); | |
826aa0a8 MX |
3415 | if (err) { |
3416 | ret = err; | |
ff023aac SB |
3417 | goto next_page; |
3418 | } | |
edd1400b | 3419 | |
26b25891 | 3420 | lock_page(page); |
edd1400b MX |
3421 | /* |
3422 | * If the page has been remove from the page cache, | |
3423 | * the data on it is meaningless, because it may be | |
3424 | * old one, the new data may be written into the new | |
3425 | * page in the page cache. | |
3426 | */ | |
3427 | if (page->mapping != inode->i_mapping) { | |
652f25a2 | 3428 | unlock_page(page); |
edd1400b MX |
3429 | page_cache_release(page); |
3430 | goto again; | |
3431 | } | |
ff023aac SB |
3432 | if (!PageUptodate(page)) { |
3433 | ret = -EIO; | |
3434 | goto next_page; | |
3435 | } | |
3436 | } | |
826aa0a8 MX |
3437 | err = write_page_nocow(nocow_ctx->sctx, |
3438 | physical_for_dev_replace, page); | |
3439 | if (err) | |
3440 | ret = err; | |
ff023aac | 3441 | next_page: |
826aa0a8 MX |
3442 | unlock_page(page); |
3443 | page_cache_release(page); | |
3444 | ||
3445 | if (ret) | |
3446 | break; | |
3447 | ||
ff023aac SB |
3448 | offset += PAGE_CACHE_SIZE; |
3449 | physical_for_dev_replace += PAGE_CACHE_SIZE; | |
3450 | len -= PAGE_CACHE_SIZE; | |
3451 | } | |
652f25a2 JB |
3452 | ret = COPY_COMPLETE; |
3453 | out_unlock: | |
3454 | unlock_extent_cached(io_tree, lockstart, lockend, &cached_state, | |
3455 | GFP_NOFS); | |
826aa0a8 | 3456 | out: |
edd1400b | 3457 | mutex_unlock(&inode->i_mutex); |
826aa0a8 | 3458 | iput(inode); |
ff023aac SB |
3459 | return ret; |
3460 | } | |
3461 | ||
3462 | static int write_page_nocow(struct scrub_ctx *sctx, | |
3463 | u64 physical_for_dev_replace, struct page *page) | |
3464 | { | |
3465 | struct bio *bio; | |
3466 | struct btrfs_device *dev; | |
3467 | int ret; | |
ff023aac SB |
3468 | |
3469 | dev = sctx->wr_ctx.tgtdev; | |
3470 | if (!dev) | |
3471 | return -EIO; | |
3472 | if (!dev->bdev) { | |
3473 | printk_ratelimited(KERN_WARNING | |
efe120a0 | 3474 | "BTRFS: scrub write_page_nocow(bdev == NULL) is unexpected!\n"); |
ff023aac SB |
3475 | return -EIO; |
3476 | } | |
9be3395b | 3477 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
ff023aac SB |
3478 | if (!bio) { |
3479 | spin_lock(&sctx->stat_lock); | |
3480 | sctx->stat.malloc_errors++; | |
3481 | spin_unlock(&sctx->stat_lock); | |
3482 | return -ENOMEM; | |
3483 | } | |
4f024f37 KO |
3484 | bio->bi_iter.bi_size = 0; |
3485 | bio->bi_iter.bi_sector = physical_for_dev_replace >> 9; | |
ff023aac SB |
3486 | bio->bi_bdev = dev->bdev; |
3487 | ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); | |
3488 | if (ret != PAGE_CACHE_SIZE) { | |
3489 | leave_with_eio: | |
3490 | bio_put(bio); | |
3491 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); | |
3492 | return -EIO; | |
3493 | } | |
ff023aac | 3494 | |
33879d45 | 3495 | if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) |
ff023aac SB |
3496 | goto leave_with_eio; |
3497 | ||
3498 | bio_put(bio); | |
3499 | return 0; | |
3500 | } |