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Commit | Line | Data |
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a2de733c | 1 | /* |
b6bfebc1 | 2 | * Copyright (C) 2011, 2012 STRATO. All rights reserved. |
a2de733c AJ |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
a2de733c | 19 | #include <linux/blkdev.h> |
558540c1 | 20 | #include <linux/ratelimit.h> |
a2de733c AJ |
21 | #include "ctree.h" |
22 | #include "volumes.h" | |
23 | #include "disk-io.h" | |
24 | #include "ordered-data.h" | |
0ef8e451 | 25 | #include "transaction.h" |
558540c1 | 26 | #include "backref.h" |
5da6fcbc | 27 | #include "extent_io.h" |
ff023aac | 28 | #include "dev-replace.h" |
21adbd5c | 29 | #include "check-integrity.h" |
606686ee | 30 | #include "rcu-string.h" |
53b381b3 | 31 | #include "raid56.h" |
a2de733c AJ |
32 | |
33 | /* | |
34 | * This is only the first step towards a full-features scrub. It reads all | |
35 | * extent and super block and verifies the checksums. In case a bad checksum | |
36 | * is found or the extent cannot be read, good data will be written back if | |
37 | * any can be found. | |
38 | * | |
39 | * Future enhancements: | |
a2de733c AJ |
40 | * - In case an unrepairable extent is encountered, track which files are |
41 | * affected and report them | |
a2de733c | 42 | * - track and record media errors, throw out bad devices |
a2de733c | 43 | * - add a mode to also read unallocated space |
a2de733c AJ |
44 | */ |
45 | ||
b5d67f64 | 46 | struct scrub_block; |
d9d181c1 | 47 | struct scrub_ctx; |
a2de733c | 48 | |
ff023aac SB |
49 | /* |
50 | * the following three values only influence the performance. | |
51 | * The last one configures the number of parallel and outstanding I/O | |
52 | * operations. The first two values configure an upper limit for the number | |
53 | * of (dynamically allocated) pages that are added to a bio. | |
54 | */ | |
55 | #define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */ | |
56 | #define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */ | |
57 | #define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */ | |
7a9e9987 SB |
58 | |
59 | /* | |
60 | * the following value times PAGE_SIZE needs to be large enough to match the | |
61 | * largest node/leaf/sector size that shall be supported. | |
62 | * Values larger than BTRFS_STRIPE_LEN are not supported. | |
63 | */ | |
b5d67f64 | 64 | #define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */ |
a2de733c 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 | 98 | int next_free; |
d458b054 | 99 | struct btrfs_work work; |
a2de733c AJ |
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; | |
140 | u32 leafsize; | |
63a212ab SB |
141 | |
142 | int is_dev_replace; | |
ff023aac | 143 | struct scrub_wr_ctx wr_ctx; |
63a212ab | 144 | |
a2de733c AJ |
145 | /* |
146 | * statistics | |
147 | */ | |
148 | struct btrfs_scrub_progress stat; | |
149 | spinlock_t stat_lock; | |
150 | }; | |
151 | ||
0ef8e451 | 152 | struct scrub_fixup_nodatasum { |
d9d181c1 | 153 | struct scrub_ctx *sctx; |
a36cf8b8 | 154 | struct btrfs_device *dev; |
0ef8e451 JS |
155 | u64 logical; |
156 | struct btrfs_root *root; | |
d458b054 | 157 | struct btrfs_work work; |
0ef8e451 JS |
158 | int mirror_num; |
159 | }; | |
160 | ||
652f25a2 JB |
161 | struct scrub_nocow_inode { |
162 | u64 inum; | |
163 | u64 offset; | |
164 | u64 root; | |
165 | struct list_head list; | |
166 | }; | |
167 | ||
ff023aac SB |
168 | struct scrub_copy_nocow_ctx { |
169 | struct scrub_ctx *sctx; | |
170 | u64 logical; | |
171 | u64 len; | |
172 | int mirror_num; | |
173 | u64 physical_for_dev_replace; | |
652f25a2 | 174 | struct list_head inodes; |
d458b054 | 175 | struct btrfs_work work; |
ff023aac SB |
176 | }; |
177 | ||
558540c1 JS |
178 | struct scrub_warning { |
179 | struct btrfs_path *path; | |
180 | u64 extent_item_size; | |
181 | char *scratch_buf; | |
182 | char *msg_buf; | |
183 | const char *errstr; | |
184 | sector_t sector; | |
185 | u64 logical; | |
186 | struct btrfs_device *dev; | |
187 | int msg_bufsize; | |
188 | int scratch_bufsize; | |
189 | }; | |
190 | ||
b5d67f64 | 191 | |
b6bfebc1 SB |
192 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx); |
193 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx); | |
194 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx); | |
195 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx); | |
b5d67f64 | 196 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check); |
d9d181c1 | 197 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
3ec706c8 | 198 | struct btrfs_fs_info *fs_info, |
ff023aac | 199 | struct scrub_block *original_sblock, |
b5d67f64 | 200 | u64 length, u64 logical, |
ff023aac | 201 | struct scrub_block *sblocks_for_recheck); |
34f5c8e9 SB |
202 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
203 | struct scrub_block *sblock, int is_metadata, | |
204 | int have_csum, u8 *csum, u64 generation, | |
205 | u16 csum_size); | |
b5d67f64 SB |
206 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
207 | struct scrub_block *sblock, | |
208 | int is_metadata, int have_csum, | |
209 | const u8 *csum, u64 generation, | |
210 | u16 csum_size); | |
b5d67f64 SB |
211 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
212 | struct scrub_block *sblock_good, | |
213 | int force_write); | |
214 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
215 | struct scrub_block *sblock_good, | |
216 | int page_num, int force_write); | |
ff023aac SB |
217 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock); |
218 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
219 | int page_num); | |
b5d67f64 SB |
220 | static int scrub_checksum_data(struct scrub_block *sblock); |
221 | static int scrub_checksum_tree_block(struct scrub_block *sblock); | |
222 | static int scrub_checksum_super(struct scrub_block *sblock); | |
223 | static void scrub_block_get(struct scrub_block *sblock); | |
224 | static void scrub_block_put(struct scrub_block *sblock); | |
7a9e9987 SB |
225 | static void scrub_page_get(struct scrub_page *spage); |
226 | static void scrub_page_put(struct scrub_page *spage); | |
ff023aac SB |
227 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
228 | struct scrub_page *spage); | |
d9d181c1 | 229 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 230 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
231 | u64 gen, int mirror_num, u8 *csum, int force, |
232 | u64 physical_for_dev_replace); | |
1623edeb | 233 | static void scrub_bio_end_io(struct bio *bio, int err); |
d458b054 | 234 | static void scrub_bio_end_io_worker(struct btrfs_work *work); |
b5d67f64 | 235 | static void scrub_block_complete(struct scrub_block *sblock); |
ff023aac SB |
236 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, |
237 | u64 extent_logical, u64 extent_len, | |
238 | u64 *extent_physical, | |
239 | struct btrfs_device **extent_dev, | |
240 | int *extent_mirror_num); | |
241 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
242 | struct scrub_wr_ctx *wr_ctx, | |
243 | struct btrfs_fs_info *fs_info, | |
244 | struct btrfs_device *dev, | |
245 | int is_dev_replace); | |
246 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx); | |
247 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
248 | struct scrub_page *spage); | |
249 | static void scrub_wr_submit(struct scrub_ctx *sctx); | |
250 | static void scrub_wr_bio_end_io(struct bio *bio, int err); | |
d458b054 | 251 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work); |
ff023aac SB |
252 | static int write_page_nocow(struct scrub_ctx *sctx, |
253 | u64 physical_for_dev_replace, struct page *page); | |
254 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, | |
652f25a2 | 255 | struct scrub_copy_nocow_ctx *ctx); |
ff023aac SB |
256 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
257 | int mirror_num, u64 physical_for_dev_replace); | |
d458b054 | 258 | static void copy_nocow_pages_worker(struct btrfs_work *work); |
cb7ab021 | 259 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
3cb0929a | 260 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
1623edeb SB |
261 | |
262 | ||
b6bfebc1 SB |
263 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx) |
264 | { | |
265 | atomic_inc(&sctx->bios_in_flight); | |
266 | } | |
267 | ||
268 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx) | |
269 | { | |
270 | atomic_dec(&sctx->bios_in_flight); | |
271 | wake_up(&sctx->list_wait); | |
272 | } | |
273 | ||
cb7ab021 | 274 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
3cb0929a WS |
275 | { |
276 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
277 | mutex_unlock(&fs_info->scrub_lock); | |
278 | wait_event(fs_info->scrub_pause_wait, | |
279 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
280 | mutex_lock(&fs_info->scrub_lock); | |
281 | } | |
282 | } | |
283 | ||
cb7ab021 WS |
284 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
285 | { | |
286 | atomic_inc(&fs_info->scrubs_paused); | |
287 | wake_up(&fs_info->scrub_pause_wait); | |
288 | ||
289 | mutex_lock(&fs_info->scrub_lock); | |
290 | __scrub_blocked_if_needed(fs_info); | |
291 | atomic_dec(&fs_info->scrubs_paused); | |
292 | mutex_unlock(&fs_info->scrub_lock); | |
293 | ||
294 | wake_up(&fs_info->scrub_pause_wait); | |
295 | } | |
296 | ||
b6bfebc1 SB |
297 | /* |
298 | * used for workers that require transaction commits (i.e., for the | |
299 | * NOCOW case) | |
300 | */ | |
301 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx) | |
302 | { | |
303 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
304 | ||
305 | /* | |
306 | * increment scrubs_running to prevent cancel requests from | |
307 | * completing as long as a worker is running. we must also | |
308 | * increment scrubs_paused to prevent deadlocking on pause | |
309 | * requests used for transactions commits (as the worker uses a | |
310 | * transaction context). it is safe to regard the worker | |
311 | * as paused for all matters practical. effectively, we only | |
312 | * avoid cancellation requests from completing. | |
313 | */ | |
314 | mutex_lock(&fs_info->scrub_lock); | |
315 | atomic_inc(&fs_info->scrubs_running); | |
316 | atomic_inc(&fs_info->scrubs_paused); | |
317 | mutex_unlock(&fs_info->scrub_lock); | |
32a44789 WS |
318 | |
319 | /* | |
320 | * check if @scrubs_running=@scrubs_paused condition | |
321 | * inside wait_event() is not an atomic operation. | |
322 | * which means we may inc/dec @scrub_running/paused | |
323 | * at any time. Let's wake up @scrub_pause_wait as | |
324 | * much as we can to let commit transaction blocked less. | |
325 | */ | |
326 | wake_up(&fs_info->scrub_pause_wait); | |
327 | ||
b6bfebc1 SB |
328 | atomic_inc(&sctx->workers_pending); |
329 | } | |
330 | ||
331 | /* used for workers that require transaction commits */ | |
332 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx) | |
333 | { | |
334 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
335 | ||
336 | /* | |
337 | * see scrub_pending_trans_workers_inc() why we're pretending | |
338 | * to be paused in the scrub counters | |
339 | */ | |
340 | mutex_lock(&fs_info->scrub_lock); | |
341 | atomic_dec(&fs_info->scrubs_running); | |
342 | atomic_dec(&fs_info->scrubs_paused); | |
343 | mutex_unlock(&fs_info->scrub_lock); | |
344 | atomic_dec(&sctx->workers_pending); | |
345 | wake_up(&fs_info->scrub_pause_wait); | |
346 | wake_up(&sctx->list_wait); | |
347 | } | |
348 | ||
d9d181c1 | 349 | static void scrub_free_csums(struct scrub_ctx *sctx) |
a2de733c | 350 | { |
d9d181c1 | 351 | while (!list_empty(&sctx->csum_list)) { |
a2de733c | 352 | struct btrfs_ordered_sum *sum; |
d9d181c1 | 353 | sum = list_first_entry(&sctx->csum_list, |
a2de733c AJ |
354 | struct btrfs_ordered_sum, list); |
355 | list_del(&sum->list); | |
356 | kfree(sum); | |
357 | } | |
358 | } | |
359 | ||
d9d181c1 | 360 | static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) |
a2de733c AJ |
361 | { |
362 | int i; | |
a2de733c | 363 | |
d9d181c1 | 364 | if (!sctx) |
a2de733c AJ |
365 | return; |
366 | ||
ff023aac SB |
367 | scrub_free_wr_ctx(&sctx->wr_ctx); |
368 | ||
b5d67f64 | 369 | /* this can happen when scrub is cancelled */ |
d9d181c1 SB |
370 | if (sctx->curr != -1) { |
371 | struct scrub_bio *sbio = sctx->bios[sctx->curr]; | |
b5d67f64 SB |
372 | |
373 | for (i = 0; i < sbio->page_count; i++) { | |
ff023aac | 374 | WARN_ON(!sbio->pagev[i]->page); |
b5d67f64 SB |
375 | scrub_block_put(sbio->pagev[i]->sblock); |
376 | } | |
377 | bio_put(sbio->bio); | |
378 | } | |
379 | ||
ff023aac | 380 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
d9d181c1 | 381 | struct scrub_bio *sbio = sctx->bios[i]; |
a2de733c AJ |
382 | |
383 | if (!sbio) | |
384 | break; | |
a2de733c AJ |
385 | kfree(sbio); |
386 | } | |
387 | ||
d9d181c1 SB |
388 | scrub_free_csums(sctx); |
389 | kfree(sctx); | |
a2de733c AJ |
390 | } |
391 | ||
392 | static noinline_for_stack | |
63a212ab | 393 | struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace) |
a2de733c | 394 | { |
d9d181c1 | 395 | struct scrub_ctx *sctx; |
a2de733c | 396 | int i; |
a2de733c | 397 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
ff023aac SB |
398 | int pages_per_rd_bio; |
399 | int ret; | |
a2de733c | 400 | |
ff023aac SB |
401 | /* |
402 | * the setting of pages_per_rd_bio is correct for scrub but might | |
403 | * be wrong for the dev_replace code where we might read from | |
404 | * different devices in the initial huge bios. However, that | |
405 | * code is able to correctly handle the case when adding a page | |
406 | * to a bio fails. | |
407 | */ | |
408 | if (dev->bdev) | |
409 | pages_per_rd_bio = min_t(int, SCRUB_PAGES_PER_RD_BIO, | |
410 | bio_get_nr_vecs(dev->bdev)); | |
411 | else | |
412 | pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; | |
d9d181c1 SB |
413 | sctx = kzalloc(sizeof(*sctx), GFP_NOFS); |
414 | if (!sctx) | |
a2de733c | 415 | goto nomem; |
63a212ab | 416 | sctx->is_dev_replace = is_dev_replace; |
ff023aac | 417 | sctx->pages_per_rd_bio = pages_per_rd_bio; |
d9d181c1 | 418 | sctx->curr = -1; |
a36cf8b8 | 419 | sctx->dev_root = dev->dev_root; |
ff023aac | 420 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
a2de733c AJ |
421 | struct scrub_bio *sbio; |
422 | ||
423 | sbio = kzalloc(sizeof(*sbio), GFP_NOFS); | |
424 | if (!sbio) | |
425 | goto nomem; | |
d9d181c1 | 426 | sctx->bios[i] = sbio; |
a2de733c | 427 | |
a2de733c | 428 | sbio->index = i; |
d9d181c1 | 429 | sbio->sctx = sctx; |
b5d67f64 | 430 | sbio->page_count = 0; |
0339ef2f QW |
431 | btrfs_init_work(&sbio->work, scrub_bio_end_io_worker, |
432 | NULL, NULL); | |
a2de733c | 433 | |
ff023aac | 434 | if (i != SCRUB_BIOS_PER_SCTX - 1) |
d9d181c1 | 435 | sctx->bios[i]->next_free = i + 1; |
0ef8e451 | 436 | else |
d9d181c1 SB |
437 | sctx->bios[i]->next_free = -1; |
438 | } | |
439 | sctx->first_free = 0; | |
440 | sctx->nodesize = dev->dev_root->nodesize; | |
441 | sctx->leafsize = dev->dev_root->leafsize; | |
442 | sctx->sectorsize = dev->dev_root->sectorsize; | |
b6bfebc1 SB |
443 | atomic_set(&sctx->bios_in_flight, 0); |
444 | atomic_set(&sctx->workers_pending, 0); | |
d9d181c1 SB |
445 | atomic_set(&sctx->cancel_req, 0); |
446 | sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
447 | INIT_LIST_HEAD(&sctx->csum_list); | |
448 | ||
449 | spin_lock_init(&sctx->list_lock); | |
450 | spin_lock_init(&sctx->stat_lock); | |
451 | init_waitqueue_head(&sctx->list_wait); | |
ff023aac SB |
452 | |
453 | ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info, | |
454 | fs_info->dev_replace.tgtdev, is_dev_replace); | |
455 | if (ret) { | |
456 | scrub_free_ctx(sctx); | |
457 | return ERR_PTR(ret); | |
458 | } | |
d9d181c1 | 459 | return sctx; |
a2de733c AJ |
460 | |
461 | nomem: | |
d9d181c1 | 462 | scrub_free_ctx(sctx); |
a2de733c AJ |
463 | return ERR_PTR(-ENOMEM); |
464 | } | |
465 | ||
ff023aac SB |
466 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, |
467 | void *warn_ctx) | |
558540c1 JS |
468 | { |
469 | u64 isize; | |
470 | u32 nlink; | |
471 | int ret; | |
472 | int i; | |
473 | struct extent_buffer *eb; | |
474 | struct btrfs_inode_item *inode_item; | |
ff023aac | 475 | struct scrub_warning *swarn = warn_ctx; |
558540c1 JS |
476 | struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; |
477 | struct inode_fs_paths *ipath = NULL; | |
478 | struct btrfs_root *local_root; | |
479 | struct btrfs_key root_key; | |
480 | ||
481 | root_key.objectid = root; | |
482 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
483 | root_key.offset = (u64)-1; | |
484 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
485 | if (IS_ERR(local_root)) { | |
486 | ret = PTR_ERR(local_root); | |
487 | goto err; | |
488 | } | |
489 | ||
490 | ret = inode_item_info(inum, 0, local_root, swarn->path); | |
491 | if (ret) { | |
492 | btrfs_release_path(swarn->path); | |
493 | goto err; | |
494 | } | |
495 | ||
496 | eb = swarn->path->nodes[0]; | |
497 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], | |
498 | struct btrfs_inode_item); | |
499 | isize = btrfs_inode_size(eb, inode_item); | |
500 | nlink = btrfs_inode_nlink(eb, inode_item); | |
501 | btrfs_release_path(swarn->path); | |
502 | ||
503 | ipath = init_ipath(4096, local_root, swarn->path); | |
26bdef54 DC |
504 | if (IS_ERR(ipath)) { |
505 | ret = PTR_ERR(ipath); | |
506 | ipath = NULL; | |
507 | goto err; | |
508 | } | |
558540c1 JS |
509 | ret = paths_from_inode(inum, ipath); |
510 | ||
511 | if (ret < 0) | |
512 | goto err; | |
513 | ||
514 | /* | |
515 | * we deliberately ignore the bit ipath might have been too small to | |
516 | * hold all of the paths here | |
517 | */ | |
518 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) | |
efe120a0 | 519 | printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev " |
558540c1 JS |
520 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " |
521 | "length %llu, links %u (path: %s)\n", swarn->errstr, | |
606686ee | 522 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
523 | (unsigned long long)swarn->sector, root, inum, offset, |
524 | min(isize - offset, (u64)PAGE_SIZE), nlink, | |
745c4d8e | 525 | (char *)(unsigned long)ipath->fspath->val[i]); |
558540c1 JS |
526 | |
527 | free_ipath(ipath); | |
528 | return 0; | |
529 | ||
530 | err: | |
efe120a0 | 531 | printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev " |
558540c1 JS |
532 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " |
533 | "resolving failed with ret=%d\n", swarn->errstr, | |
606686ee | 534 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
535 | (unsigned long long)swarn->sector, root, inum, offset, ret); |
536 | ||
537 | free_ipath(ipath); | |
538 | return 0; | |
539 | } | |
540 | ||
b5d67f64 | 541 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
558540c1 | 542 | { |
a36cf8b8 SB |
543 | struct btrfs_device *dev; |
544 | struct btrfs_fs_info *fs_info; | |
558540c1 JS |
545 | struct btrfs_path *path; |
546 | struct btrfs_key found_key; | |
547 | struct extent_buffer *eb; | |
548 | struct btrfs_extent_item *ei; | |
549 | struct scrub_warning swarn; | |
69917e43 LB |
550 | unsigned long ptr = 0; |
551 | u64 extent_item_pos; | |
552 | u64 flags = 0; | |
558540c1 | 553 | u64 ref_root; |
69917e43 | 554 | u32 item_size; |
558540c1 | 555 | u8 ref_level; |
558540c1 | 556 | const int bufsize = 4096; |
69917e43 | 557 | int ret; |
558540c1 | 558 | |
a36cf8b8 | 559 | WARN_ON(sblock->page_count < 1); |
7a9e9987 | 560 | dev = sblock->pagev[0]->dev; |
a36cf8b8 SB |
561 | fs_info = sblock->sctx->dev_root->fs_info; |
562 | ||
558540c1 JS |
563 | path = btrfs_alloc_path(); |
564 | ||
565 | swarn.scratch_buf = kmalloc(bufsize, GFP_NOFS); | |
566 | swarn.msg_buf = kmalloc(bufsize, GFP_NOFS); | |
7a9e9987 SB |
567 | swarn.sector = (sblock->pagev[0]->physical) >> 9; |
568 | swarn.logical = sblock->pagev[0]->logical; | |
558540c1 | 569 | swarn.errstr = errstr; |
a36cf8b8 | 570 | swarn.dev = NULL; |
558540c1 JS |
571 | swarn.msg_bufsize = bufsize; |
572 | swarn.scratch_bufsize = bufsize; | |
573 | ||
574 | if (!path || !swarn.scratch_buf || !swarn.msg_buf) | |
575 | goto out; | |
576 | ||
69917e43 LB |
577 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, |
578 | &flags); | |
558540c1 JS |
579 | if (ret < 0) |
580 | goto out; | |
581 | ||
4692cf58 | 582 | extent_item_pos = swarn.logical - found_key.objectid; |
558540c1 JS |
583 | swarn.extent_item_size = found_key.offset; |
584 | ||
585 | eb = path->nodes[0]; | |
586 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); | |
587 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
588 | ||
69917e43 | 589 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
558540c1 JS |
590 | do { |
591 | ret = tree_backref_for_extent(&ptr, eb, ei, item_size, | |
592 | &ref_root, &ref_level); | |
606686ee | 593 | printk_in_rcu(KERN_WARNING |
efe120a0 | 594 | "BTRFS: %s at logical %llu on dev %s, " |
558540c1 | 595 | "sector %llu: metadata %s (level %d) in tree " |
606686ee JB |
596 | "%llu\n", errstr, swarn.logical, |
597 | rcu_str_deref(dev->name), | |
558540c1 JS |
598 | (unsigned long long)swarn.sector, |
599 | ref_level ? "node" : "leaf", | |
600 | ret < 0 ? -1 : ref_level, | |
601 | ret < 0 ? -1 : ref_root); | |
602 | } while (ret != 1); | |
d8fe29e9 | 603 | btrfs_release_path(path); |
558540c1 | 604 | } else { |
d8fe29e9 | 605 | btrfs_release_path(path); |
558540c1 | 606 | swarn.path = path; |
a36cf8b8 | 607 | swarn.dev = dev; |
7a3ae2f8 JS |
608 | iterate_extent_inodes(fs_info, found_key.objectid, |
609 | extent_item_pos, 1, | |
558540c1 JS |
610 | scrub_print_warning_inode, &swarn); |
611 | } | |
612 | ||
613 | out: | |
614 | btrfs_free_path(path); | |
615 | kfree(swarn.scratch_buf); | |
616 | kfree(swarn.msg_buf); | |
617 | } | |
618 | ||
ff023aac | 619 | static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx) |
0ef8e451 | 620 | { |
5da6fcbc | 621 | struct page *page = NULL; |
0ef8e451 | 622 | unsigned long index; |
ff023aac | 623 | struct scrub_fixup_nodatasum *fixup = fixup_ctx; |
0ef8e451 | 624 | int ret; |
5da6fcbc | 625 | int corrected = 0; |
0ef8e451 | 626 | struct btrfs_key key; |
5da6fcbc | 627 | struct inode *inode = NULL; |
6f1c3605 | 628 | struct btrfs_fs_info *fs_info; |
0ef8e451 JS |
629 | u64 end = offset + PAGE_SIZE - 1; |
630 | struct btrfs_root *local_root; | |
6f1c3605 | 631 | int srcu_index; |
0ef8e451 JS |
632 | |
633 | key.objectid = root; | |
634 | key.type = BTRFS_ROOT_ITEM_KEY; | |
635 | key.offset = (u64)-1; | |
6f1c3605 LB |
636 | |
637 | fs_info = fixup->root->fs_info; | |
638 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
639 | ||
640 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
641 | if (IS_ERR(local_root)) { | |
642 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 | 643 | return PTR_ERR(local_root); |
6f1c3605 | 644 | } |
0ef8e451 JS |
645 | |
646 | key.type = BTRFS_INODE_ITEM_KEY; | |
647 | key.objectid = inum; | |
648 | key.offset = 0; | |
6f1c3605 LB |
649 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); |
650 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 JS |
651 | if (IS_ERR(inode)) |
652 | return PTR_ERR(inode); | |
653 | ||
0ef8e451 JS |
654 | index = offset >> PAGE_CACHE_SHIFT; |
655 | ||
656 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
5da6fcbc JS |
657 | if (!page) { |
658 | ret = -ENOMEM; | |
659 | goto out; | |
660 | } | |
661 | ||
662 | if (PageUptodate(page)) { | |
5da6fcbc JS |
663 | if (PageDirty(page)) { |
664 | /* | |
665 | * we need to write the data to the defect sector. the | |
666 | * data that was in that sector is not in memory, | |
667 | * because the page was modified. we must not write the | |
668 | * modified page to that sector. | |
669 | * | |
670 | * TODO: what could be done here: wait for the delalloc | |
671 | * runner to write out that page (might involve | |
672 | * COW) and see whether the sector is still | |
673 | * referenced afterwards. | |
674 | * | |
675 | * For the meantime, we'll treat this error | |
676 | * incorrectable, although there is a chance that a | |
677 | * later scrub will find the bad sector again and that | |
678 | * there's no dirty page in memory, then. | |
679 | */ | |
680 | ret = -EIO; | |
681 | goto out; | |
682 | } | |
3ec706c8 SB |
683 | fs_info = BTRFS_I(inode)->root->fs_info; |
684 | ret = repair_io_failure(fs_info, offset, PAGE_SIZE, | |
5da6fcbc JS |
685 | fixup->logical, page, |
686 | fixup->mirror_num); | |
687 | unlock_page(page); | |
688 | corrected = !ret; | |
689 | } else { | |
690 | /* | |
691 | * we need to get good data first. the general readpage path | |
692 | * will call repair_io_failure for us, we just have to make | |
693 | * sure we read the bad mirror. | |
694 | */ | |
695 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
696 | EXTENT_DAMAGED, GFP_NOFS); | |
697 | if (ret) { | |
698 | /* set_extent_bits should give proper error */ | |
699 | WARN_ON(ret > 0); | |
700 | if (ret > 0) | |
701 | ret = -EFAULT; | |
702 | goto out; | |
703 | } | |
704 | ||
705 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, | |
706 | btrfs_get_extent, | |
707 | fixup->mirror_num); | |
708 | wait_on_page_locked(page); | |
709 | ||
710 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, | |
711 | end, EXTENT_DAMAGED, 0, NULL); | |
712 | if (!corrected) | |
713 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
714 | EXTENT_DAMAGED, GFP_NOFS); | |
715 | } | |
716 | ||
717 | out: | |
718 | if (page) | |
719 | put_page(page); | |
720 | if (inode) | |
721 | iput(inode); | |
0ef8e451 JS |
722 | |
723 | if (ret < 0) | |
724 | return ret; | |
725 | ||
726 | if (ret == 0 && corrected) { | |
727 | /* | |
728 | * we only need to call readpage for one of the inodes belonging | |
729 | * to this extent. so make iterate_extent_inodes stop | |
730 | */ | |
731 | return 1; | |
732 | } | |
733 | ||
734 | return -EIO; | |
735 | } | |
736 | ||
d458b054 | 737 | static void scrub_fixup_nodatasum(struct btrfs_work *work) |
0ef8e451 JS |
738 | { |
739 | int ret; | |
740 | struct scrub_fixup_nodatasum *fixup; | |
d9d181c1 | 741 | struct scrub_ctx *sctx; |
0ef8e451 | 742 | struct btrfs_trans_handle *trans = NULL; |
0ef8e451 JS |
743 | struct btrfs_path *path; |
744 | int uncorrectable = 0; | |
745 | ||
746 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); | |
d9d181c1 | 747 | sctx = fixup->sctx; |
0ef8e451 JS |
748 | |
749 | path = btrfs_alloc_path(); | |
750 | if (!path) { | |
d9d181c1 SB |
751 | spin_lock(&sctx->stat_lock); |
752 | ++sctx->stat.malloc_errors; | |
753 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
754 | uncorrectable = 1; |
755 | goto out; | |
756 | } | |
757 | ||
758 | trans = btrfs_join_transaction(fixup->root); | |
759 | if (IS_ERR(trans)) { | |
760 | uncorrectable = 1; | |
761 | goto out; | |
762 | } | |
763 | ||
764 | /* | |
765 | * the idea is to trigger a regular read through the standard path. we | |
766 | * read a page from the (failed) logical address by specifying the | |
767 | * corresponding copynum of the failed sector. thus, that readpage is | |
768 | * expected to fail. | |
769 | * that is the point where on-the-fly error correction will kick in | |
770 | * (once it's finished) and rewrite the failed sector if a good copy | |
771 | * can be found. | |
772 | */ | |
773 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, | |
774 | path, scrub_fixup_readpage, | |
775 | fixup); | |
776 | if (ret < 0) { | |
777 | uncorrectable = 1; | |
778 | goto out; | |
779 | } | |
780 | WARN_ON(ret != 1); | |
781 | ||
d9d181c1 SB |
782 | spin_lock(&sctx->stat_lock); |
783 | ++sctx->stat.corrected_errors; | |
784 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
785 | |
786 | out: | |
787 | if (trans && !IS_ERR(trans)) | |
788 | btrfs_end_transaction(trans, fixup->root); | |
789 | if (uncorrectable) { | |
d9d181c1 SB |
790 | spin_lock(&sctx->stat_lock); |
791 | ++sctx->stat.uncorrectable_errors; | |
792 | spin_unlock(&sctx->stat_lock); | |
ff023aac SB |
793 | btrfs_dev_replace_stats_inc( |
794 | &sctx->dev_root->fs_info->dev_replace. | |
795 | num_uncorrectable_read_errors); | |
efe120a0 FH |
796 | printk_ratelimited_in_rcu(KERN_ERR "BTRFS: " |
797 | "unable to fixup (nodatasum) error at logical %llu on dev %s\n", | |
c1c9ff7c | 798 | fixup->logical, rcu_str_deref(fixup->dev->name)); |
0ef8e451 JS |
799 | } |
800 | ||
801 | btrfs_free_path(path); | |
802 | kfree(fixup); | |
803 | ||
b6bfebc1 | 804 | scrub_pending_trans_workers_dec(sctx); |
0ef8e451 JS |
805 | } |
806 | ||
a2de733c | 807 | /* |
b5d67f64 SB |
808 | * scrub_handle_errored_block gets called when either verification of the |
809 | * pages failed or the bio failed to read, e.g. with EIO. In the latter | |
810 | * case, this function handles all pages in the bio, even though only one | |
811 | * may be bad. | |
812 | * The goal of this function is to repair the errored block by using the | |
813 | * contents of one of the mirrors. | |
a2de733c | 814 | */ |
b5d67f64 | 815 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
a2de733c | 816 | { |
d9d181c1 | 817 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
a36cf8b8 | 818 | struct btrfs_device *dev; |
b5d67f64 SB |
819 | struct btrfs_fs_info *fs_info; |
820 | u64 length; | |
821 | u64 logical; | |
822 | u64 generation; | |
823 | unsigned int failed_mirror_index; | |
824 | unsigned int is_metadata; | |
825 | unsigned int have_csum; | |
826 | u8 *csum; | |
827 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ | |
828 | struct scrub_block *sblock_bad; | |
829 | int ret; | |
830 | int mirror_index; | |
831 | int page_num; | |
832 | int success; | |
558540c1 | 833 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
b5d67f64 SB |
834 | DEFAULT_RATELIMIT_BURST); |
835 | ||
836 | BUG_ON(sblock_to_check->page_count < 1); | |
a36cf8b8 | 837 | fs_info = sctx->dev_root->fs_info; |
4ded4f63 SB |
838 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
839 | /* | |
840 | * if we find an error in a super block, we just report it. | |
841 | * They will get written with the next transaction commit | |
842 | * anyway | |
843 | */ | |
844 | spin_lock(&sctx->stat_lock); | |
845 | ++sctx->stat.super_errors; | |
846 | spin_unlock(&sctx->stat_lock); | |
847 | return 0; | |
848 | } | |
b5d67f64 | 849 | length = sblock_to_check->page_count * PAGE_SIZE; |
7a9e9987 SB |
850 | logical = sblock_to_check->pagev[0]->logical; |
851 | generation = sblock_to_check->pagev[0]->generation; | |
852 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); | |
853 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; | |
854 | is_metadata = !(sblock_to_check->pagev[0]->flags & | |
b5d67f64 | 855 | BTRFS_EXTENT_FLAG_DATA); |
7a9e9987 SB |
856 | have_csum = sblock_to_check->pagev[0]->have_csum; |
857 | csum = sblock_to_check->pagev[0]->csum; | |
858 | dev = sblock_to_check->pagev[0]->dev; | |
13db62b7 | 859 | |
ff023aac SB |
860 | if (sctx->is_dev_replace && !is_metadata && !have_csum) { |
861 | sblocks_for_recheck = NULL; | |
862 | goto nodatasum_case; | |
863 | } | |
864 | ||
b5d67f64 SB |
865 | /* |
866 | * read all mirrors one after the other. This includes to | |
867 | * re-read the extent or metadata block that failed (that was | |
868 | * the cause that this fixup code is called) another time, | |
869 | * page by page this time in order to know which pages | |
870 | * caused I/O errors and which ones are good (for all mirrors). | |
871 | * It is the goal to handle the situation when more than one | |
872 | * mirror contains I/O errors, but the errors do not | |
873 | * overlap, i.e. the data can be repaired by selecting the | |
874 | * pages from those mirrors without I/O error on the | |
875 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) | |
876 | * would be that mirror #1 has an I/O error on the first page, | |
877 | * the second page is good, and mirror #2 has an I/O error on | |
878 | * the second page, but the first page is good. | |
879 | * Then the first page of the first mirror can be repaired by | |
880 | * taking the first page of the second mirror, and the | |
881 | * second page of the second mirror can be repaired by | |
882 | * copying the contents of the 2nd page of the 1st mirror. | |
883 | * One more note: if the pages of one mirror contain I/O | |
884 | * errors, the checksum cannot be verified. In order to get | |
885 | * the best data for repairing, the first attempt is to find | |
886 | * a mirror without I/O errors and with a validated checksum. | |
887 | * Only if this is not possible, the pages are picked from | |
888 | * mirrors with I/O errors without considering the checksum. | |
889 | * If the latter is the case, at the end, the checksum of the | |
890 | * repaired area is verified in order to correctly maintain | |
891 | * the statistics. | |
892 | */ | |
893 | ||
894 | sblocks_for_recheck = kzalloc(BTRFS_MAX_MIRRORS * | |
895 | sizeof(*sblocks_for_recheck), | |
896 | GFP_NOFS); | |
897 | if (!sblocks_for_recheck) { | |
d9d181c1 SB |
898 | spin_lock(&sctx->stat_lock); |
899 | sctx->stat.malloc_errors++; | |
900 | sctx->stat.read_errors++; | |
901 | sctx->stat.uncorrectable_errors++; | |
902 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 903 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 904 | goto out; |
a2de733c AJ |
905 | } |
906 | ||
b5d67f64 | 907 | /* setup the context, map the logical blocks and alloc the pages */ |
ff023aac | 908 | ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length, |
b5d67f64 SB |
909 | logical, sblocks_for_recheck); |
910 | if (ret) { | |
d9d181c1 SB |
911 | spin_lock(&sctx->stat_lock); |
912 | sctx->stat.read_errors++; | |
913 | sctx->stat.uncorrectable_errors++; | |
914 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 915 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 SB |
916 | goto out; |
917 | } | |
918 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); | |
919 | sblock_bad = sblocks_for_recheck + failed_mirror_index; | |
13db62b7 | 920 | |
b5d67f64 | 921 | /* build and submit the bios for the failed mirror, check checksums */ |
34f5c8e9 SB |
922 | scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum, |
923 | csum, generation, sctx->csum_size); | |
a2de733c | 924 | |
b5d67f64 SB |
925 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
926 | sblock_bad->no_io_error_seen) { | |
927 | /* | |
928 | * the error disappeared after reading page by page, or | |
929 | * the area was part of a huge bio and other parts of the | |
930 | * bio caused I/O errors, or the block layer merged several | |
931 | * read requests into one and the error is caused by a | |
932 | * different bio (usually one of the two latter cases is | |
933 | * the cause) | |
934 | */ | |
d9d181c1 SB |
935 | spin_lock(&sctx->stat_lock); |
936 | sctx->stat.unverified_errors++; | |
937 | spin_unlock(&sctx->stat_lock); | |
a2de733c | 938 | |
ff023aac SB |
939 | if (sctx->is_dev_replace) |
940 | scrub_write_block_to_dev_replace(sblock_bad); | |
b5d67f64 | 941 | goto out; |
a2de733c | 942 | } |
a2de733c | 943 | |
b5d67f64 | 944 | if (!sblock_bad->no_io_error_seen) { |
d9d181c1 SB |
945 | spin_lock(&sctx->stat_lock); |
946 | sctx->stat.read_errors++; | |
947 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
948 | if (__ratelimit(&_rs)) |
949 | scrub_print_warning("i/o error", sblock_to_check); | |
a36cf8b8 | 950 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 951 | } else if (sblock_bad->checksum_error) { |
d9d181c1 SB |
952 | spin_lock(&sctx->stat_lock); |
953 | sctx->stat.csum_errors++; | |
954 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
955 | if (__ratelimit(&_rs)) |
956 | scrub_print_warning("checksum error", sblock_to_check); | |
a36cf8b8 | 957 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 958 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 959 | } else if (sblock_bad->header_error) { |
d9d181c1 SB |
960 | spin_lock(&sctx->stat_lock); |
961 | sctx->stat.verify_errors++; | |
962 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
963 | if (__ratelimit(&_rs)) |
964 | scrub_print_warning("checksum/header error", | |
965 | sblock_to_check); | |
442a4f63 | 966 | if (sblock_bad->generation_error) |
a36cf8b8 | 967 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 SB |
968 | BTRFS_DEV_STAT_GENERATION_ERRS); |
969 | else | |
a36cf8b8 | 970 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 971 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 972 | } |
a2de733c | 973 | |
33ef30ad ID |
974 | if (sctx->readonly) { |
975 | ASSERT(!sctx->is_dev_replace); | |
976 | goto out; | |
977 | } | |
a2de733c | 978 | |
b5d67f64 SB |
979 | if (!is_metadata && !have_csum) { |
980 | struct scrub_fixup_nodatasum *fixup_nodatasum; | |
a2de733c | 981 | |
ff023aac SB |
982 | nodatasum_case: |
983 | WARN_ON(sctx->is_dev_replace); | |
984 | ||
b5d67f64 SB |
985 | /* |
986 | * !is_metadata and !have_csum, this means that the data | |
987 | * might not be COW'ed, that it might be modified | |
988 | * concurrently. The general strategy to work on the | |
989 | * commit root does not help in the case when COW is not | |
990 | * used. | |
991 | */ | |
992 | fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS); | |
993 | if (!fixup_nodatasum) | |
994 | goto did_not_correct_error; | |
d9d181c1 | 995 | fixup_nodatasum->sctx = sctx; |
a36cf8b8 | 996 | fixup_nodatasum->dev = dev; |
b5d67f64 SB |
997 | fixup_nodatasum->logical = logical; |
998 | fixup_nodatasum->root = fs_info->extent_root; | |
999 | fixup_nodatasum->mirror_num = failed_mirror_index + 1; | |
b6bfebc1 | 1000 | scrub_pending_trans_workers_inc(sctx); |
0339ef2f QW |
1001 | btrfs_init_work(&fixup_nodatasum->work, scrub_fixup_nodatasum, |
1002 | NULL, NULL); | |
1003 | btrfs_queue_work(fs_info->scrub_workers, | |
1004 | &fixup_nodatasum->work); | |
b5d67f64 | 1005 | goto out; |
a2de733c AJ |
1006 | } |
1007 | ||
b5d67f64 SB |
1008 | /* |
1009 | * now build and submit the bios for the other mirrors, check | |
cb2ced73 SB |
1010 | * checksums. |
1011 | * First try to pick the mirror which is completely without I/O | |
b5d67f64 SB |
1012 | * errors and also does not have a checksum error. |
1013 | * If one is found, and if a checksum is present, the full block | |
1014 | * that is known to contain an error is rewritten. Afterwards | |
1015 | * the block is known to be corrected. | |
1016 | * If a mirror is found which is completely correct, and no | |
1017 | * checksum is present, only those pages are rewritten that had | |
1018 | * an I/O error in the block to be repaired, since it cannot be | |
1019 | * determined, which copy of the other pages is better (and it | |
1020 | * could happen otherwise that a correct page would be | |
1021 | * overwritten by a bad one). | |
1022 | */ | |
1023 | for (mirror_index = 0; | |
1024 | mirror_index < BTRFS_MAX_MIRRORS && | |
1025 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1026 | mirror_index++) { | |
cb2ced73 | 1027 | struct scrub_block *sblock_other; |
b5d67f64 | 1028 | |
cb2ced73 SB |
1029 | if (mirror_index == failed_mirror_index) |
1030 | continue; | |
1031 | sblock_other = sblocks_for_recheck + mirror_index; | |
1032 | ||
1033 | /* build and submit the bios, check checksums */ | |
34f5c8e9 SB |
1034 | scrub_recheck_block(fs_info, sblock_other, is_metadata, |
1035 | have_csum, csum, generation, | |
1036 | sctx->csum_size); | |
1037 | ||
1038 | if (!sblock_other->header_error && | |
b5d67f64 SB |
1039 | !sblock_other->checksum_error && |
1040 | sblock_other->no_io_error_seen) { | |
ff023aac SB |
1041 | if (sctx->is_dev_replace) { |
1042 | scrub_write_block_to_dev_replace(sblock_other); | |
1043 | } else { | |
1044 | int force_write = is_metadata || have_csum; | |
1045 | ||
1046 | ret = scrub_repair_block_from_good_copy( | |
1047 | sblock_bad, sblock_other, | |
1048 | force_write); | |
1049 | } | |
b5d67f64 SB |
1050 | if (0 == ret) |
1051 | goto corrected_error; | |
1052 | } | |
1053 | } | |
a2de733c AJ |
1054 | |
1055 | /* | |
ff023aac SB |
1056 | * for dev_replace, pick good pages and write to the target device. |
1057 | */ | |
1058 | if (sctx->is_dev_replace) { | |
1059 | success = 1; | |
1060 | for (page_num = 0; page_num < sblock_bad->page_count; | |
1061 | page_num++) { | |
1062 | int sub_success; | |
1063 | ||
1064 | sub_success = 0; | |
1065 | for (mirror_index = 0; | |
1066 | mirror_index < BTRFS_MAX_MIRRORS && | |
1067 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1068 | mirror_index++) { | |
1069 | struct scrub_block *sblock_other = | |
1070 | sblocks_for_recheck + mirror_index; | |
1071 | struct scrub_page *page_other = | |
1072 | sblock_other->pagev[page_num]; | |
1073 | ||
1074 | if (!page_other->io_error) { | |
1075 | ret = scrub_write_page_to_dev_replace( | |
1076 | sblock_other, page_num); | |
1077 | if (ret == 0) { | |
1078 | /* succeeded for this page */ | |
1079 | sub_success = 1; | |
1080 | break; | |
1081 | } else { | |
1082 | btrfs_dev_replace_stats_inc( | |
1083 | &sctx->dev_root-> | |
1084 | fs_info->dev_replace. | |
1085 | num_write_errors); | |
1086 | } | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | if (!sub_success) { | |
1091 | /* | |
1092 | * did not find a mirror to fetch the page | |
1093 | * from. scrub_write_page_to_dev_replace() | |
1094 | * handles this case (page->io_error), by | |
1095 | * filling the block with zeros before | |
1096 | * submitting the write request | |
1097 | */ | |
1098 | success = 0; | |
1099 | ret = scrub_write_page_to_dev_replace( | |
1100 | sblock_bad, page_num); | |
1101 | if (ret) | |
1102 | btrfs_dev_replace_stats_inc( | |
1103 | &sctx->dev_root->fs_info-> | |
1104 | dev_replace.num_write_errors); | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | goto out; | |
1109 | } | |
1110 | ||
1111 | /* | |
1112 | * for regular scrub, repair those pages that are errored. | |
1113 | * In case of I/O errors in the area that is supposed to be | |
b5d67f64 SB |
1114 | * repaired, continue by picking good copies of those pages. |
1115 | * Select the good pages from mirrors to rewrite bad pages from | |
1116 | * the area to fix. Afterwards verify the checksum of the block | |
1117 | * that is supposed to be repaired. This verification step is | |
1118 | * only done for the purpose of statistic counting and for the | |
1119 | * final scrub report, whether errors remain. | |
1120 | * A perfect algorithm could make use of the checksum and try | |
1121 | * all possible combinations of pages from the different mirrors | |
1122 | * until the checksum verification succeeds. For example, when | |
1123 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page | |
1124 | * of mirror #2 is readable but the final checksum test fails, | |
1125 | * then the 2nd page of mirror #3 could be tried, whether now | |
1126 | * the final checksum succeedes. But this would be a rare | |
1127 | * exception and is therefore not implemented. At least it is | |
1128 | * avoided that the good copy is overwritten. | |
1129 | * A more useful improvement would be to pick the sectors | |
1130 | * without I/O error based on sector sizes (512 bytes on legacy | |
1131 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one | |
1132 | * mirror could be repaired by taking 512 byte of a different | |
1133 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE | |
1134 | * area are unreadable. | |
a2de733c | 1135 | */ |
a2de733c | 1136 | |
b5d67f64 SB |
1137 | /* can only fix I/O errors from here on */ |
1138 | if (sblock_bad->no_io_error_seen) | |
1139 | goto did_not_correct_error; | |
1140 | ||
1141 | success = 1; | |
1142 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { | |
7a9e9987 | 1143 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
b5d67f64 SB |
1144 | |
1145 | if (!page_bad->io_error) | |
a2de733c | 1146 | continue; |
b5d67f64 SB |
1147 | |
1148 | for (mirror_index = 0; | |
1149 | mirror_index < BTRFS_MAX_MIRRORS && | |
1150 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1151 | mirror_index++) { | |
1152 | struct scrub_block *sblock_other = sblocks_for_recheck + | |
1153 | mirror_index; | |
7a9e9987 SB |
1154 | struct scrub_page *page_other = sblock_other->pagev[ |
1155 | page_num]; | |
b5d67f64 SB |
1156 | |
1157 | if (!page_other->io_error) { | |
1158 | ret = scrub_repair_page_from_good_copy( | |
1159 | sblock_bad, sblock_other, page_num, 0); | |
1160 | if (0 == ret) { | |
1161 | page_bad->io_error = 0; | |
1162 | break; /* succeeded for this page */ | |
1163 | } | |
1164 | } | |
96e36920 | 1165 | } |
a2de733c | 1166 | |
b5d67f64 SB |
1167 | if (page_bad->io_error) { |
1168 | /* did not find a mirror to copy the page from */ | |
1169 | success = 0; | |
1170 | } | |
a2de733c | 1171 | } |
a2de733c | 1172 | |
b5d67f64 SB |
1173 | if (success) { |
1174 | if (is_metadata || have_csum) { | |
1175 | /* | |
1176 | * need to verify the checksum now that all | |
1177 | * sectors on disk are repaired (the write | |
1178 | * request for data to be repaired is on its way). | |
1179 | * Just be lazy and use scrub_recheck_block() | |
1180 | * which re-reads the data before the checksum | |
1181 | * is verified, but most likely the data comes out | |
1182 | * of the page cache. | |
1183 | */ | |
34f5c8e9 SB |
1184 | scrub_recheck_block(fs_info, sblock_bad, |
1185 | is_metadata, have_csum, csum, | |
1186 | generation, sctx->csum_size); | |
1187 | if (!sblock_bad->header_error && | |
b5d67f64 SB |
1188 | !sblock_bad->checksum_error && |
1189 | sblock_bad->no_io_error_seen) | |
1190 | goto corrected_error; | |
1191 | else | |
1192 | goto did_not_correct_error; | |
1193 | } else { | |
1194 | corrected_error: | |
d9d181c1 SB |
1195 | spin_lock(&sctx->stat_lock); |
1196 | sctx->stat.corrected_errors++; | |
1197 | spin_unlock(&sctx->stat_lock); | |
606686ee | 1198 | printk_ratelimited_in_rcu(KERN_ERR |
efe120a0 | 1199 | "BTRFS: fixed up error at logical %llu on dev %s\n", |
c1c9ff7c | 1200 | logical, rcu_str_deref(dev->name)); |
8628764e | 1201 | } |
b5d67f64 SB |
1202 | } else { |
1203 | did_not_correct_error: | |
d9d181c1 SB |
1204 | spin_lock(&sctx->stat_lock); |
1205 | sctx->stat.uncorrectable_errors++; | |
1206 | spin_unlock(&sctx->stat_lock); | |
606686ee | 1207 | printk_ratelimited_in_rcu(KERN_ERR |
efe120a0 | 1208 | "BTRFS: unable to fixup (regular) error at logical %llu on dev %s\n", |
c1c9ff7c | 1209 | logical, rcu_str_deref(dev->name)); |
96e36920 | 1210 | } |
a2de733c | 1211 | |
b5d67f64 SB |
1212 | out: |
1213 | if (sblocks_for_recheck) { | |
1214 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; | |
1215 | mirror_index++) { | |
1216 | struct scrub_block *sblock = sblocks_for_recheck + | |
1217 | mirror_index; | |
1218 | int page_index; | |
1219 | ||
7a9e9987 SB |
1220 | for (page_index = 0; page_index < sblock->page_count; |
1221 | page_index++) { | |
1222 | sblock->pagev[page_index]->sblock = NULL; | |
1223 | scrub_page_put(sblock->pagev[page_index]); | |
1224 | } | |
b5d67f64 SB |
1225 | } |
1226 | kfree(sblocks_for_recheck); | |
1227 | } | |
a2de733c | 1228 | |
b5d67f64 SB |
1229 | return 0; |
1230 | } | |
a2de733c | 1231 | |
d9d181c1 | 1232 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
3ec706c8 | 1233 | struct btrfs_fs_info *fs_info, |
ff023aac | 1234 | struct scrub_block *original_sblock, |
b5d67f64 SB |
1235 | u64 length, u64 logical, |
1236 | struct scrub_block *sblocks_for_recheck) | |
1237 | { | |
1238 | int page_index; | |
1239 | int mirror_index; | |
1240 | int ret; | |
1241 | ||
1242 | /* | |
7a9e9987 | 1243 | * note: the two members ref_count and outstanding_pages |
b5d67f64 SB |
1244 | * are not used (and not set) in the blocks that are used for |
1245 | * the recheck procedure | |
1246 | */ | |
1247 | ||
1248 | page_index = 0; | |
1249 | while (length > 0) { | |
1250 | u64 sublen = min_t(u64, length, PAGE_SIZE); | |
1251 | u64 mapped_length = sublen; | |
1252 | struct btrfs_bio *bbio = NULL; | |
a2de733c | 1253 | |
b5d67f64 SB |
1254 | /* |
1255 | * with a length of PAGE_SIZE, each returned stripe | |
1256 | * represents one mirror | |
1257 | */ | |
29a8d9a0 SB |
1258 | ret = btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS, logical, |
1259 | &mapped_length, &bbio, 0); | |
b5d67f64 SB |
1260 | if (ret || !bbio || mapped_length < sublen) { |
1261 | kfree(bbio); | |
1262 | return -EIO; | |
1263 | } | |
a2de733c | 1264 | |
ff023aac | 1265 | BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
1266 | for (mirror_index = 0; mirror_index < (int)bbio->num_stripes; |
1267 | mirror_index++) { | |
1268 | struct scrub_block *sblock; | |
1269 | struct scrub_page *page; | |
1270 | ||
1271 | if (mirror_index >= BTRFS_MAX_MIRRORS) | |
1272 | continue; | |
1273 | ||
1274 | sblock = sblocks_for_recheck + mirror_index; | |
7a9e9987 SB |
1275 | sblock->sctx = sctx; |
1276 | page = kzalloc(sizeof(*page), GFP_NOFS); | |
1277 | if (!page) { | |
1278 | leave_nomem: | |
d9d181c1 SB |
1279 | spin_lock(&sctx->stat_lock); |
1280 | sctx->stat.malloc_errors++; | |
1281 | spin_unlock(&sctx->stat_lock); | |
cf93dcce | 1282 | kfree(bbio); |
b5d67f64 SB |
1283 | return -ENOMEM; |
1284 | } | |
7a9e9987 SB |
1285 | scrub_page_get(page); |
1286 | sblock->pagev[page_index] = page; | |
1287 | page->logical = logical; | |
1288 | page->physical = bbio->stripes[mirror_index].physical; | |
ff023aac SB |
1289 | BUG_ON(page_index >= original_sblock->page_count); |
1290 | page->physical_for_dev_replace = | |
1291 | original_sblock->pagev[page_index]-> | |
1292 | physical_for_dev_replace; | |
7a9e9987 SB |
1293 | /* for missing devices, dev->bdev is NULL */ |
1294 | page->dev = bbio->stripes[mirror_index].dev; | |
1295 | page->mirror_num = mirror_index + 1; | |
b5d67f64 | 1296 | sblock->page_count++; |
7a9e9987 SB |
1297 | page->page = alloc_page(GFP_NOFS); |
1298 | if (!page->page) | |
1299 | goto leave_nomem; | |
b5d67f64 SB |
1300 | } |
1301 | kfree(bbio); | |
1302 | length -= sublen; | |
1303 | logical += sublen; | |
1304 | page_index++; | |
1305 | } | |
1306 | ||
1307 | return 0; | |
96e36920 ID |
1308 | } |
1309 | ||
b5d67f64 SB |
1310 | /* |
1311 | * this function will check the on disk data for checksum errors, header | |
1312 | * errors and read I/O errors. If any I/O errors happen, the exact pages | |
1313 | * which are errored are marked as being bad. The goal is to enable scrub | |
1314 | * to take those pages that are not errored from all the mirrors so that | |
1315 | * the pages that are errored in the just handled mirror can be repaired. | |
1316 | */ | |
34f5c8e9 SB |
1317 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
1318 | struct scrub_block *sblock, int is_metadata, | |
1319 | int have_csum, u8 *csum, u64 generation, | |
1320 | u16 csum_size) | |
96e36920 | 1321 | { |
b5d67f64 | 1322 | int page_num; |
96e36920 | 1323 | |
b5d67f64 SB |
1324 | sblock->no_io_error_seen = 1; |
1325 | sblock->header_error = 0; | |
1326 | sblock->checksum_error = 0; | |
96e36920 | 1327 | |
b5d67f64 SB |
1328 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1329 | struct bio *bio; | |
7a9e9987 | 1330 | struct scrub_page *page = sblock->pagev[page_num]; |
b5d67f64 | 1331 | |
442a4f63 | 1332 | if (page->dev->bdev == NULL) { |
ea9947b4 SB |
1333 | page->io_error = 1; |
1334 | sblock->no_io_error_seen = 0; | |
1335 | continue; | |
1336 | } | |
1337 | ||
7a9e9987 | 1338 | WARN_ON(!page->page); |
9be3395b | 1339 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
34f5c8e9 SB |
1340 | if (!bio) { |
1341 | page->io_error = 1; | |
1342 | sblock->no_io_error_seen = 0; | |
1343 | continue; | |
1344 | } | |
442a4f63 | 1345 | bio->bi_bdev = page->dev->bdev; |
b5d67f64 | 1346 | bio->bi_sector = page->physical >> 9; |
b5d67f64 | 1347 | |
34f5c8e9 | 1348 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
c170bbb4 | 1349 | if (btrfsic_submit_bio_wait(READ, bio)) |
b5d67f64 | 1350 | sblock->no_io_error_seen = 0; |
c170bbb4 | 1351 | |
b5d67f64 SB |
1352 | bio_put(bio); |
1353 | } | |
96e36920 | 1354 | |
b5d67f64 SB |
1355 | if (sblock->no_io_error_seen) |
1356 | scrub_recheck_block_checksum(fs_info, sblock, is_metadata, | |
1357 | have_csum, csum, generation, | |
1358 | csum_size); | |
1359 | ||
34f5c8e9 | 1360 | return; |
a2de733c AJ |
1361 | } |
1362 | ||
b5d67f64 SB |
1363 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
1364 | struct scrub_block *sblock, | |
1365 | int is_metadata, int have_csum, | |
1366 | const u8 *csum, u64 generation, | |
1367 | u16 csum_size) | |
a2de733c | 1368 | { |
b5d67f64 SB |
1369 | int page_num; |
1370 | u8 calculated_csum[BTRFS_CSUM_SIZE]; | |
1371 | u32 crc = ~(u32)0; | |
b5d67f64 SB |
1372 | void *mapped_buffer; |
1373 | ||
7a9e9987 | 1374 | WARN_ON(!sblock->pagev[0]->page); |
b5d67f64 SB |
1375 | if (is_metadata) { |
1376 | struct btrfs_header *h; | |
1377 | ||
7a9e9987 | 1378 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 SB |
1379 | h = (struct btrfs_header *)mapped_buffer; |
1380 | ||
3cae210f | 1381 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h) || |
b5d67f64 SB |
1382 | memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE) || |
1383 | memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
442a4f63 | 1384 | BTRFS_UUID_SIZE)) { |
b5d67f64 | 1385 | sblock->header_error = 1; |
3cae210f | 1386 | } else if (generation != btrfs_stack_header_generation(h)) { |
442a4f63 SB |
1387 | sblock->header_error = 1; |
1388 | sblock->generation_error = 1; | |
1389 | } | |
b5d67f64 SB |
1390 | csum = h->csum; |
1391 | } else { | |
1392 | if (!have_csum) | |
1393 | return; | |
a2de733c | 1394 | |
7a9e9987 | 1395 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 | 1396 | } |
a2de733c | 1397 | |
b5d67f64 SB |
1398 | for (page_num = 0;;) { |
1399 | if (page_num == 0 && is_metadata) | |
b0496686 | 1400 | crc = btrfs_csum_data( |
b5d67f64 SB |
1401 | ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE, |
1402 | crc, PAGE_SIZE - BTRFS_CSUM_SIZE); | |
1403 | else | |
b0496686 | 1404 | crc = btrfs_csum_data(mapped_buffer, crc, PAGE_SIZE); |
b5d67f64 | 1405 | |
9613bebb | 1406 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1407 | page_num++; |
1408 | if (page_num >= sblock->page_count) | |
1409 | break; | |
7a9e9987 | 1410 | WARN_ON(!sblock->pagev[page_num]->page); |
b5d67f64 | 1411 | |
7a9e9987 | 1412 | mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page); |
b5d67f64 SB |
1413 | } |
1414 | ||
1415 | btrfs_csum_final(crc, calculated_csum); | |
1416 | if (memcmp(calculated_csum, csum, csum_size)) | |
1417 | sblock->checksum_error = 1; | |
a2de733c AJ |
1418 | } |
1419 | ||
b5d67f64 SB |
1420 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
1421 | struct scrub_block *sblock_good, | |
1422 | int force_write) | |
1423 | { | |
1424 | int page_num; | |
1425 | int ret = 0; | |
96e36920 | 1426 | |
b5d67f64 SB |
1427 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
1428 | int ret_sub; | |
96e36920 | 1429 | |
b5d67f64 SB |
1430 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
1431 | sblock_good, | |
1432 | page_num, | |
1433 | force_write); | |
1434 | if (ret_sub) | |
1435 | ret = ret_sub; | |
a2de733c | 1436 | } |
b5d67f64 SB |
1437 | |
1438 | return ret; | |
1439 | } | |
1440 | ||
1441 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
1442 | struct scrub_block *sblock_good, | |
1443 | int page_num, int force_write) | |
1444 | { | |
7a9e9987 SB |
1445 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
1446 | struct scrub_page *page_good = sblock_good->pagev[page_num]; | |
b5d67f64 | 1447 | |
7a9e9987 SB |
1448 | BUG_ON(page_bad->page == NULL); |
1449 | BUG_ON(page_good->page == NULL); | |
b5d67f64 SB |
1450 | if (force_write || sblock_bad->header_error || |
1451 | sblock_bad->checksum_error || page_bad->io_error) { | |
1452 | struct bio *bio; | |
1453 | int ret; | |
b5d67f64 | 1454 | |
ff023aac | 1455 | if (!page_bad->dev->bdev) { |
efe120a0 FH |
1456 | printk_ratelimited(KERN_WARNING "BTRFS: " |
1457 | "scrub_repair_page_from_good_copy(bdev == NULL) " | |
1458 | "is unexpected!\n"); | |
ff023aac SB |
1459 | return -EIO; |
1460 | } | |
1461 | ||
9be3395b | 1462 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
e627ee7b TI |
1463 | if (!bio) |
1464 | return -EIO; | |
442a4f63 | 1465 | bio->bi_bdev = page_bad->dev->bdev; |
b5d67f64 | 1466 | bio->bi_sector = page_bad->physical >> 9; |
b5d67f64 SB |
1467 | |
1468 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); | |
1469 | if (PAGE_SIZE != ret) { | |
1470 | bio_put(bio); | |
1471 | return -EIO; | |
13db62b7 | 1472 | } |
b5d67f64 | 1473 | |
c170bbb4 | 1474 | if (btrfsic_submit_bio_wait(WRITE, bio)) { |
442a4f63 SB |
1475 | btrfs_dev_stat_inc_and_print(page_bad->dev, |
1476 | BTRFS_DEV_STAT_WRITE_ERRS); | |
ff023aac SB |
1477 | btrfs_dev_replace_stats_inc( |
1478 | &sblock_bad->sctx->dev_root->fs_info-> | |
1479 | dev_replace.num_write_errors); | |
442a4f63 SB |
1480 | bio_put(bio); |
1481 | return -EIO; | |
1482 | } | |
b5d67f64 | 1483 | bio_put(bio); |
a2de733c AJ |
1484 | } |
1485 | ||
b5d67f64 SB |
1486 | return 0; |
1487 | } | |
1488 | ||
ff023aac SB |
1489 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
1490 | { | |
1491 | int page_num; | |
1492 | ||
1493 | for (page_num = 0; page_num < sblock->page_count; page_num++) { | |
1494 | int ret; | |
1495 | ||
1496 | ret = scrub_write_page_to_dev_replace(sblock, page_num); | |
1497 | if (ret) | |
1498 | btrfs_dev_replace_stats_inc( | |
1499 | &sblock->sctx->dev_root->fs_info->dev_replace. | |
1500 | num_write_errors); | |
1501 | } | |
1502 | } | |
1503 | ||
1504 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
1505 | int page_num) | |
1506 | { | |
1507 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1508 | ||
1509 | BUG_ON(spage->page == NULL); | |
1510 | if (spage->io_error) { | |
1511 | void *mapped_buffer = kmap_atomic(spage->page); | |
1512 | ||
1513 | memset(mapped_buffer, 0, PAGE_CACHE_SIZE); | |
1514 | flush_dcache_page(spage->page); | |
1515 | kunmap_atomic(mapped_buffer); | |
1516 | } | |
1517 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); | |
1518 | } | |
1519 | ||
1520 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
1521 | struct scrub_page *spage) | |
1522 | { | |
1523 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1524 | struct scrub_bio *sbio; | |
1525 | int ret; | |
1526 | ||
1527 | mutex_lock(&wr_ctx->wr_lock); | |
1528 | again: | |
1529 | if (!wr_ctx->wr_curr_bio) { | |
1530 | wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio), | |
1531 | GFP_NOFS); | |
1532 | if (!wr_ctx->wr_curr_bio) { | |
1533 | mutex_unlock(&wr_ctx->wr_lock); | |
1534 | return -ENOMEM; | |
1535 | } | |
1536 | wr_ctx->wr_curr_bio->sctx = sctx; | |
1537 | wr_ctx->wr_curr_bio->page_count = 0; | |
1538 | } | |
1539 | sbio = wr_ctx->wr_curr_bio; | |
1540 | if (sbio->page_count == 0) { | |
1541 | struct bio *bio; | |
1542 | ||
1543 | sbio->physical = spage->physical_for_dev_replace; | |
1544 | sbio->logical = spage->logical; | |
1545 | sbio->dev = wr_ctx->tgtdev; | |
1546 | bio = sbio->bio; | |
1547 | if (!bio) { | |
9be3395b | 1548 | bio = btrfs_io_bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio); |
ff023aac SB |
1549 | if (!bio) { |
1550 | mutex_unlock(&wr_ctx->wr_lock); | |
1551 | return -ENOMEM; | |
1552 | } | |
1553 | sbio->bio = bio; | |
1554 | } | |
1555 | ||
1556 | bio->bi_private = sbio; | |
1557 | bio->bi_end_io = scrub_wr_bio_end_io; | |
1558 | bio->bi_bdev = sbio->dev->bdev; | |
1559 | bio->bi_sector = sbio->physical >> 9; | |
1560 | sbio->err = 0; | |
1561 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != | |
1562 | spage->physical_for_dev_replace || | |
1563 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
1564 | spage->logical) { | |
1565 | scrub_wr_submit(sctx); | |
1566 | goto again; | |
1567 | } | |
1568 | ||
1569 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1570 | if (ret != PAGE_SIZE) { | |
1571 | if (sbio->page_count < 1) { | |
1572 | bio_put(sbio->bio); | |
1573 | sbio->bio = NULL; | |
1574 | mutex_unlock(&wr_ctx->wr_lock); | |
1575 | return -EIO; | |
1576 | } | |
1577 | scrub_wr_submit(sctx); | |
1578 | goto again; | |
1579 | } | |
1580 | ||
1581 | sbio->pagev[sbio->page_count] = spage; | |
1582 | scrub_page_get(spage); | |
1583 | sbio->page_count++; | |
1584 | if (sbio->page_count == wr_ctx->pages_per_wr_bio) | |
1585 | scrub_wr_submit(sctx); | |
1586 | mutex_unlock(&wr_ctx->wr_lock); | |
1587 | ||
1588 | return 0; | |
1589 | } | |
1590 | ||
1591 | static void scrub_wr_submit(struct scrub_ctx *sctx) | |
1592 | { | |
1593 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1594 | struct scrub_bio *sbio; | |
1595 | ||
1596 | if (!wr_ctx->wr_curr_bio) | |
1597 | return; | |
1598 | ||
1599 | sbio = wr_ctx->wr_curr_bio; | |
1600 | wr_ctx->wr_curr_bio = NULL; | |
1601 | WARN_ON(!sbio->bio->bi_bdev); | |
1602 | scrub_pending_bio_inc(sctx); | |
1603 | /* process all writes in a single worker thread. Then the block layer | |
1604 | * orders the requests before sending them to the driver which | |
1605 | * doubled the write performance on spinning disks when measured | |
1606 | * with Linux 3.5 */ | |
1607 | btrfsic_submit_bio(WRITE, sbio->bio); | |
1608 | } | |
1609 | ||
1610 | static void scrub_wr_bio_end_io(struct bio *bio, int err) | |
1611 | { | |
1612 | struct scrub_bio *sbio = bio->bi_private; | |
1613 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; | |
1614 | ||
1615 | sbio->err = err; | |
1616 | sbio->bio = bio; | |
1617 | ||
0339ef2f QW |
1618 | btrfs_init_work(&sbio->work, scrub_wr_bio_end_io_worker, NULL, NULL); |
1619 | btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work); | |
ff023aac SB |
1620 | } |
1621 | ||
d458b054 | 1622 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) |
ff023aac SB |
1623 | { |
1624 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
1625 | struct scrub_ctx *sctx = sbio->sctx; | |
1626 | int i; | |
1627 | ||
1628 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); | |
1629 | if (sbio->err) { | |
1630 | struct btrfs_dev_replace *dev_replace = | |
1631 | &sbio->sctx->dev_root->fs_info->dev_replace; | |
1632 | ||
1633 | for (i = 0; i < sbio->page_count; i++) { | |
1634 | struct scrub_page *spage = sbio->pagev[i]; | |
1635 | ||
1636 | spage->io_error = 1; | |
1637 | btrfs_dev_replace_stats_inc(&dev_replace-> | |
1638 | num_write_errors); | |
1639 | } | |
1640 | } | |
1641 | ||
1642 | for (i = 0; i < sbio->page_count; i++) | |
1643 | scrub_page_put(sbio->pagev[i]); | |
1644 | ||
1645 | bio_put(sbio->bio); | |
1646 | kfree(sbio); | |
1647 | scrub_pending_bio_dec(sctx); | |
1648 | } | |
1649 | ||
1650 | static int scrub_checksum(struct scrub_block *sblock) | |
b5d67f64 SB |
1651 | { |
1652 | u64 flags; | |
1653 | int ret; | |
1654 | ||
7a9e9987 SB |
1655 | WARN_ON(sblock->page_count < 1); |
1656 | flags = sblock->pagev[0]->flags; | |
b5d67f64 SB |
1657 | ret = 0; |
1658 | if (flags & BTRFS_EXTENT_FLAG_DATA) | |
1659 | ret = scrub_checksum_data(sblock); | |
1660 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) | |
1661 | ret = scrub_checksum_tree_block(sblock); | |
1662 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
1663 | (void)scrub_checksum_super(sblock); | |
1664 | else | |
1665 | WARN_ON(1); | |
1666 | if (ret) | |
1667 | scrub_handle_errored_block(sblock); | |
ff023aac SB |
1668 | |
1669 | return ret; | |
a2de733c AJ |
1670 | } |
1671 | ||
b5d67f64 | 1672 | static int scrub_checksum_data(struct scrub_block *sblock) |
a2de733c | 1673 | { |
d9d181c1 | 1674 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1675 | u8 csum[BTRFS_CSUM_SIZE]; |
b5d67f64 SB |
1676 | u8 *on_disk_csum; |
1677 | struct page *page; | |
1678 | void *buffer; | |
a2de733c AJ |
1679 | u32 crc = ~(u32)0; |
1680 | int fail = 0; | |
b5d67f64 SB |
1681 | u64 len; |
1682 | int index; | |
a2de733c | 1683 | |
b5d67f64 | 1684 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1685 | if (!sblock->pagev[0]->have_csum) |
a2de733c AJ |
1686 | return 0; |
1687 | ||
7a9e9987 SB |
1688 | on_disk_csum = sblock->pagev[0]->csum; |
1689 | page = sblock->pagev[0]->page; | |
9613bebb | 1690 | buffer = kmap_atomic(page); |
b5d67f64 | 1691 | |
d9d181c1 | 1692 | len = sctx->sectorsize; |
b5d67f64 SB |
1693 | index = 0; |
1694 | for (;;) { | |
1695 | u64 l = min_t(u64, len, PAGE_SIZE); | |
1696 | ||
b0496686 | 1697 | crc = btrfs_csum_data(buffer, crc, l); |
9613bebb | 1698 | kunmap_atomic(buffer); |
b5d67f64 SB |
1699 | len -= l; |
1700 | if (len == 0) | |
1701 | break; | |
1702 | index++; | |
1703 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1704 | BUG_ON(!sblock->pagev[index]->page); |
1705 | page = sblock->pagev[index]->page; | |
9613bebb | 1706 | buffer = kmap_atomic(page); |
b5d67f64 SB |
1707 | } |
1708 | ||
a2de733c | 1709 | btrfs_csum_final(crc, csum); |
d9d181c1 | 1710 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1711 | fail = 1; |
1712 | ||
a2de733c AJ |
1713 | return fail; |
1714 | } | |
1715 | ||
b5d67f64 | 1716 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
a2de733c | 1717 | { |
d9d181c1 | 1718 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1719 | struct btrfs_header *h; |
a36cf8b8 | 1720 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 1721 | struct btrfs_fs_info *fs_info = root->fs_info; |
b5d67f64 SB |
1722 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1723 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1724 | struct page *page; | |
1725 | void *mapped_buffer; | |
1726 | u64 mapped_size; | |
1727 | void *p; | |
a2de733c AJ |
1728 | u32 crc = ~(u32)0; |
1729 | int fail = 0; | |
1730 | int crc_fail = 0; | |
b5d67f64 SB |
1731 | u64 len; |
1732 | int index; | |
1733 | ||
1734 | BUG_ON(sblock->page_count < 1); | |
7a9e9987 | 1735 | page = sblock->pagev[0]->page; |
9613bebb | 1736 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1737 | h = (struct btrfs_header *)mapped_buffer; |
d9d181c1 | 1738 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
a2de733c AJ |
1739 | |
1740 | /* | |
1741 | * we don't use the getter functions here, as we | |
1742 | * a) don't have an extent buffer and | |
1743 | * b) the page is already kmapped | |
1744 | */ | |
a2de733c | 1745 | |
3cae210f | 1746 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h)) |
a2de733c AJ |
1747 | ++fail; |
1748 | ||
3cae210f | 1749 | if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h)) |
a2de733c AJ |
1750 | ++fail; |
1751 | ||
1752 | if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) | |
1753 | ++fail; | |
1754 | ||
1755 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
1756 | BTRFS_UUID_SIZE)) | |
1757 | ++fail; | |
1758 | ||
ff023aac | 1759 | WARN_ON(sctx->nodesize != sctx->leafsize); |
d9d181c1 | 1760 | len = sctx->nodesize - BTRFS_CSUM_SIZE; |
b5d67f64 SB |
1761 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
1762 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1763 | index = 0; | |
1764 | for (;;) { | |
1765 | u64 l = min_t(u64, len, mapped_size); | |
1766 | ||
b0496686 | 1767 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 1768 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1769 | len -= l; |
1770 | if (len == 0) | |
1771 | break; | |
1772 | index++; | |
1773 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1774 | BUG_ON(!sblock->pagev[index]->page); |
1775 | page = sblock->pagev[index]->page; | |
9613bebb | 1776 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1777 | mapped_size = PAGE_SIZE; |
1778 | p = mapped_buffer; | |
1779 | } | |
1780 | ||
1781 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1782 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1783 | ++crc_fail; |
1784 | ||
a2de733c AJ |
1785 | return fail || crc_fail; |
1786 | } | |
1787 | ||
b5d67f64 | 1788 | static int scrub_checksum_super(struct scrub_block *sblock) |
a2de733c AJ |
1789 | { |
1790 | struct btrfs_super_block *s; | |
d9d181c1 | 1791 | struct scrub_ctx *sctx = sblock->sctx; |
a36cf8b8 | 1792 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 1793 | struct btrfs_fs_info *fs_info = root->fs_info; |
b5d67f64 SB |
1794 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1795 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1796 | struct page *page; | |
1797 | void *mapped_buffer; | |
1798 | u64 mapped_size; | |
1799 | void *p; | |
a2de733c | 1800 | u32 crc = ~(u32)0; |
442a4f63 SB |
1801 | int fail_gen = 0; |
1802 | int fail_cor = 0; | |
b5d67f64 SB |
1803 | u64 len; |
1804 | int index; | |
a2de733c | 1805 | |
b5d67f64 | 1806 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1807 | page = sblock->pagev[0]->page; |
9613bebb | 1808 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1809 | s = (struct btrfs_super_block *)mapped_buffer; |
d9d181c1 | 1810 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
a2de733c | 1811 | |
3cae210f | 1812 | if (sblock->pagev[0]->logical != btrfs_super_bytenr(s)) |
442a4f63 | 1813 | ++fail_cor; |
a2de733c | 1814 | |
3cae210f | 1815 | if (sblock->pagev[0]->generation != btrfs_super_generation(s)) |
442a4f63 | 1816 | ++fail_gen; |
a2de733c AJ |
1817 | |
1818 | if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) | |
442a4f63 | 1819 | ++fail_cor; |
a2de733c | 1820 | |
b5d67f64 SB |
1821 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
1822 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; | |
1823 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1824 | index = 0; | |
1825 | for (;;) { | |
1826 | u64 l = min_t(u64, len, mapped_size); | |
1827 | ||
b0496686 | 1828 | crc = btrfs_csum_data(p, crc, l); |
9613bebb | 1829 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1830 | len -= l; |
1831 | if (len == 0) | |
1832 | break; | |
1833 | index++; | |
1834 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1835 | BUG_ON(!sblock->pagev[index]->page); |
1836 | page = sblock->pagev[index]->page; | |
9613bebb | 1837 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1838 | mapped_size = PAGE_SIZE; |
1839 | p = mapped_buffer; | |
1840 | } | |
1841 | ||
1842 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1843 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
442a4f63 | 1844 | ++fail_cor; |
a2de733c | 1845 | |
442a4f63 | 1846 | if (fail_cor + fail_gen) { |
a2de733c AJ |
1847 | /* |
1848 | * if we find an error in a super block, we just report it. | |
1849 | * They will get written with the next transaction commit | |
1850 | * anyway | |
1851 | */ | |
d9d181c1 SB |
1852 | spin_lock(&sctx->stat_lock); |
1853 | ++sctx->stat.super_errors; | |
1854 | spin_unlock(&sctx->stat_lock); | |
442a4f63 | 1855 | if (fail_cor) |
7a9e9987 | 1856 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 SB |
1857 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
1858 | else | |
7a9e9987 | 1859 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 | 1860 | BTRFS_DEV_STAT_GENERATION_ERRS); |
a2de733c AJ |
1861 | } |
1862 | ||
442a4f63 | 1863 | return fail_cor + fail_gen; |
a2de733c AJ |
1864 | } |
1865 | ||
b5d67f64 SB |
1866 | static void scrub_block_get(struct scrub_block *sblock) |
1867 | { | |
1868 | atomic_inc(&sblock->ref_count); | |
1869 | } | |
1870 | ||
1871 | static void scrub_block_put(struct scrub_block *sblock) | |
1872 | { | |
1873 | if (atomic_dec_and_test(&sblock->ref_count)) { | |
1874 | int i; | |
1875 | ||
1876 | for (i = 0; i < sblock->page_count; i++) | |
7a9e9987 | 1877 | scrub_page_put(sblock->pagev[i]); |
b5d67f64 SB |
1878 | kfree(sblock); |
1879 | } | |
1880 | } | |
1881 | ||
7a9e9987 SB |
1882 | static void scrub_page_get(struct scrub_page *spage) |
1883 | { | |
1884 | atomic_inc(&spage->ref_count); | |
1885 | } | |
1886 | ||
1887 | static void scrub_page_put(struct scrub_page *spage) | |
1888 | { | |
1889 | if (atomic_dec_and_test(&spage->ref_count)) { | |
1890 | if (spage->page) | |
1891 | __free_page(spage->page); | |
1892 | kfree(spage); | |
1893 | } | |
1894 | } | |
1895 | ||
d9d181c1 | 1896 | static void scrub_submit(struct scrub_ctx *sctx) |
a2de733c AJ |
1897 | { |
1898 | struct scrub_bio *sbio; | |
1899 | ||
d9d181c1 | 1900 | if (sctx->curr == -1) |
1623edeb | 1901 | return; |
a2de733c | 1902 | |
d9d181c1 SB |
1903 | sbio = sctx->bios[sctx->curr]; |
1904 | sctx->curr = -1; | |
b6bfebc1 | 1905 | scrub_pending_bio_inc(sctx); |
a2de733c | 1906 | |
ff023aac SB |
1907 | if (!sbio->bio->bi_bdev) { |
1908 | /* | |
1909 | * this case should not happen. If btrfs_map_block() is | |
1910 | * wrong, it could happen for dev-replace operations on | |
1911 | * missing devices when no mirrors are available, but in | |
1912 | * this case it should already fail the mount. | |
1913 | * This case is handled correctly (but _very_ slowly). | |
1914 | */ | |
1915 | printk_ratelimited(KERN_WARNING | |
efe120a0 | 1916 | "BTRFS: scrub_submit(bio bdev == NULL) is unexpected!\n"); |
ff023aac SB |
1917 | bio_endio(sbio->bio, -EIO); |
1918 | } else { | |
1919 | btrfsic_submit_bio(READ, sbio->bio); | |
1920 | } | |
a2de733c AJ |
1921 | } |
1922 | ||
ff023aac SB |
1923 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
1924 | struct scrub_page *spage) | |
a2de733c | 1925 | { |
b5d67f64 | 1926 | struct scrub_block *sblock = spage->sblock; |
a2de733c | 1927 | struct scrub_bio *sbio; |
69f4cb52 | 1928 | int ret; |
a2de733c AJ |
1929 | |
1930 | again: | |
1931 | /* | |
1932 | * grab a fresh bio or wait for one to become available | |
1933 | */ | |
d9d181c1 SB |
1934 | while (sctx->curr == -1) { |
1935 | spin_lock(&sctx->list_lock); | |
1936 | sctx->curr = sctx->first_free; | |
1937 | if (sctx->curr != -1) { | |
1938 | sctx->first_free = sctx->bios[sctx->curr]->next_free; | |
1939 | sctx->bios[sctx->curr]->next_free = -1; | |
1940 | sctx->bios[sctx->curr]->page_count = 0; | |
1941 | spin_unlock(&sctx->list_lock); | |
a2de733c | 1942 | } else { |
d9d181c1 SB |
1943 | spin_unlock(&sctx->list_lock); |
1944 | wait_event(sctx->list_wait, sctx->first_free != -1); | |
a2de733c AJ |
1945 | } |
1946 | } | |
d9d181c1 | 1947 | sbio = sctx->bios[sctx->curr]; |
b5d67f64 | 1948 | if (sbio->page_count == 0) { |
69f4cb52 AJ |
1949 | struct bio *bio; |
1950 | ||
b5d67f64 SB |
1951 | sbio->physical = spage->physical; |
1952 | sbio->logical = spage->logical; | |
a36cf8b8 | 1953 | sbio->dev = spage->dev; |
b5d67f64 SB |
1954 | bio = sbio->bio; |
1955 | if (!bio) { | |
9be3395b | 1956 | bio = btrfs_io_bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio); |
b5d67f64 SB |
1957 | if (!bio) |
1958 | return -ENOMEM; | |
1959 | sbio->bio = bio; | |
1960 | } | |
69f4cb52 AJ |
1961 | |
1962 | bio->bi_private = sbio; | |
1963 | bio->bi_end_io = scrub_bio_end_io; | |
a36cf8b8 SB |
1964 | bio->bi_bdev = sbio->dev->bdev; |
1965 | bio->bi_sector = sbio->physical >> 9; | |
69f4cb52 | 1966 | sbio->err = 0; |
b5d67f64 SB |
1967 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
1968 | spage->physical || | |
1969 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
a36cf8b8 SB |
1970 | spage->logical || |
1971 | sbio->dev != spage->dev) { | |
d9d181c1 | 1972 | scrub_submit(sctx); |
a2de733c AJ |
1973 | goto again; |
1974 | } | |
69f4cb52 | 1975 | |
b5d67f64 SB |
1976 | sbio->pagev[sbio->page_count] = spage; |
1977 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1978 | if (ret != PAGE_SIZE) { | |
1979 | if (sbio->page_count < 1) { | |
1980 | bio_put(sbio->bio); | |
1981 | sbio->bio = NULL; | |
1982 | return -EIO; | |
1983 | } | |
d9d181c1 | 1984 | scrub_submit(sctx); |
69f4cb52 AJ |
1985 | goto again; |
1986 | } | |
1987 | ||
ff023aac | 1988 | scrub_block_get(sblock); /* one for the page added to the bio */ |
b5d67f64 SB |
1989 | atomic_inc(&sblock->outstanding_pages); |
1990 | sbio->page_count++; | |
ff023aac | 1991 | if (sbio->page_count == sctx->pages_per_rd_bio) |
d9d181c1 | 1992 | scrub_submit(sctx); |
b5d67f64 SB |
1993 | |
1994 | return 0; | |
1995 | } | |
1996 | ||
d9d181c1 | 1997 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 1998 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
1999 | u64 gen, int mirror_num, u8 *csum, int force, |
2000 | u64 physical_for_dev_replace) | |
b5d67f64 SB |
2001 | { |
2002 | struct scrub_block *sblock; | |
2003 | int index; | |
2004 | ||
2005 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
2006 | if (!sblock) { | |
d9d181c1 SB |
2007 | spin_lock(&sctx->stat_lock); |
2008 | sctx->stat.malloc_errors++; | |
2009 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2010 | return -ENOMEM; |
a2de733c | 2011 | } |
b5d67f64 | 2012 | |
7a9e9987 SB |
2013 | /* one ref inside this function, plus one for each page added to |
2014 | * a bio later on */ | |
b5d67f64 | 2015 | atomic_set(&sblock->ref_count, 1); |
d9d181c1 | 2016 | sblock->sctx = sctx; |
b5d67f64 SB |
2017 | sblock->no_io_error_seen = 1; |
2018 | ||
2019 | for (index = 0; len > 0; index++) { | |
7a9e9987 | 2020 | struct scrub_page *spage; |
b5d67f64 SB |
2021 | u64 l = min_t(u64, len, PAGE_SIZE); |
2022 | ||
7a9e9987 SB |
2023 | spage = kzalloc(sizeof(*spage), GFP_NOFS); |
2024 | if (!spage) { | |
2025 | leave_nomem: | |
d9d181c1 SB |
2026 | spin_lock(&sctx->stat_lock); |
2027 | sctx->stat.malloc_errors++; | |
2028 | spin_unlock(&sctx->stat_lock); | |
7a9e9987 | 2029 | scrub_block_put(sblock); |
b5d67f64 SB |
2030 | return -ENOMEM; |
2031 | } | |
7a9e9987 SB |
2032 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
2033 | scrub_page_get(spage); | |
2034 | sblock->pagev[index] = spage; | |
b5d67f64 | 2035 | spage->sblock = sblock; |
a36cf8b8 | 2036 | spage->dev = dev; |
b5d67f64 SB |
2037 | spage->flags = flags; |
2038 | spage->generation = gen; | |
2039 | spage->logical = logical; | |
2040 | spage->physical = physical; | |
ff023aac | 2041 | spage->physical_for_dev_replace = physical_for_dev_replace; |
b5d67f64 SB |
2042 | spage->mirror_num = mirror_num; |
2043 | if (csum) { | |
2044 | spage->have_csum = 1; | |
d9d181c1 | 2045 | memcpy(spage->csum, csum, sctx->csum_size); |
b5d67f64 SB |
2046 | } else { |
2047 | spage->have_csum = 0; | |
2048 | } | |
2049 | sblock->page_count++; | |
7a9e9987 SB |
2050 | spage->page = alloc_page(GFP_NOFS); |
2051 | if (!spage->page) | |
2052 | goto leave_nomem; | |
b5d67f64 SB |
2053 | len -= l; |
2054 | logical += l; | |
2055 | physical += l; | |
ff023aac | 2056 | physical_for_dev_replace += l; |
b5d67f64 SB |
2057 | } |
2058 | ||
7a9e9987 | 2059 | WARN_ON(sblock->page_count == 0); |
b5d67f64 | 2060 | for (index = 0; index < sblock->page_count; index++) { |
7a9e9987 | 2061 | struct scrub_page *spage = sblock->pagev[index]; |
1bc87793 AJ |
2062 | int ret; |
2063 | ||
ff023aac | 2064 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
b5d67f64 SB |
2065 | if (ret) { |
2066 | scrub_block_put(sblock); | |
1bc87793 | 2067 | return ret; |
b5d67f64 | 2068 | } |
1bc87793 | 2069 | } |
a2de733c | 2070 | |
b5d67f64 | 2071 | if (force) |
d9d181c1 | 2072 | scrub_submit(sctx); |
a2de733c | 2073 | |
b5d67f64 SB |
2074 | /* last one frees, either here or in bio completion for last page */ |
2075 | scrub_block_put(sblock); | |
a2de733c AJ |
2076 | return 0; |
2077 | } | |
2078 | ||
b5d67f64 SB |
2079 | static void scrub_bio_end_io(struct bio *bio, int err) |
2080 | { | |
2081 | struct scrub_bio *sbio = bio->bi_private; | |
a36cf8b8 | 2082 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
b5d67f64 SB |
2083 | |
2084 | sbio->err = err; | |
2085 | sbio->bio = bio; | |
2086 | ||
0339ef2f | 2087 | btrfs_queue_work(fs_info->scrub_workers, &sbio->work); |
b5d67f64 SB |
2088 | } |
2089 | ||
d458b054 | 2090 | static void scrub_bio_end_io_worker(struct btrfs_work *work) |
b5d67f64 SB |
2091 | { |
2092 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
d9d181c1 | 2093 | struct scrub_ctx *sctx = sbio->sctx; |
b5d67f64 SB |
2094 | int i; |
2095 | ||
ff023aac | 2096 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
2097 | if (sbio->err) { |
2098 | for (i = 0; i < sbio->page_count; i++) { | |
2099 | struct scrub_page *spage = sbio->pagev[i]; | |
2100 | ||
2101 | spage->io_error = 1; | |
2102 | spage->sblock->no_io_error_seen = 0; | |
2103 | } | |
2104 | } | |
2105 | ||
2106 | /* now complete the scrub_block items that have all pages completed */ | |
2107 | for (i = 0; i < sbio->page_count; i++) { | |
2108 | struct scrub_page *spage = sbio->pagev[i]; | |
2109 | struct scrub_block *sblock = spage->sblock; | |
2110 | ||
2111 | if (atomic_dec_and_test(&sblock->outstanding_pages)) | |
2112 | scrub_block_complete(sblock); | |
2113 | scrub_block_put(sblock); | |
2114 | } | |
2115 | ||
b5d67f64 SB |
2116 | bio_put(sbio->bio); |
2117 | sbio->bio = NULL; | |
d9d181c1 SB |
2118 | spin_lock(&sctx->list_lock); |
2119 | sbio->next_free = sctx->first_free; | |
2120 | sctx->first_free = sbio->index; | |
2121 | spin_unlock(&sctx->list_lock); | |
ff023aac SB |
2122 | |
2123 | if (sctx->is_dev_replace && | |
2124 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { | |
2125 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2126 | scrub_wr_submit(sctx); | |
2127 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2128 | } | |
2129 | ||
b6bfebc1 | 2130 | scrub_pending_bio_dec(sctx); |
b5d67f64 SB |
2131 | } |
2132 | ||
2133 | static void scrub_block_complete(struct scrub_block *sblock) | |
2134 | { | |
ff023aac | 2135 | if (!sblock->no_io_error_seen) { |
b5d67f64 | 2136 | scrub_handle_errored_block(sblock); |
ff023aac SB |
2137 | } else { |
2138 | /* | |
2139 | * if has checksum error, write via repair mechanism in | |
2140 | * dev replace case, otherwise write here in dev replace | |
2141 | * case. | |
2142 | */ | |
2143 | if (!scrub_checksum(sblock) && sblock->sctx->is_dev_replace) | |
2144 | scrub_write_block_to_dev_replace(sblock); | |
2145 | } | |
b5d67f64 SB |
2146 | } |
2147 | ||
d9d181c1 | 2148 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len, |
a2de733c AJ |
2149 | u8 *csum) |
2150 | { | |
2151 | struct btrfs_ordered_sum *sum = NULL; | |
f51a4a18 | 2152 | unsigned long index; |
a2de733c | 2153 | unsigned long num_sectors; |
a2de733c | 2154 | |
d9d181c1 SB |
2155 | while (!list_empty(&sctx->csum_list)) { |
2156 | sum = list_first_entry(&sctx->csum_list, | |
a2de733c AJ |
2157 | struct btrfs_ordered_sum, list); |
2158 | if (sum->bytenr > logical) | |
2159 | return 0; | |
2160 | if (sum->bytenr + sum->len > logical) | |
2161 | break; | |
2162 | ||
d9d181c1 | 2163 | ++sctx->stat.csum_discards; |
a2de733c AJ |
2164 | list_del(&sum->list); |
2165 | kfree(sum); | |
2166 | sum = NULL; | |
2167 | } | |
2168 | if (!sum) | |
2169 | return 0; | |
2170 | ||
f51a4a18 | 2171 | index = ((u32)(logical - sum->bytenr)) / sctx->sectorsize; |
d9d181c1 | 2172 | num_sectors = sum->len / sctx->sectorsize; |
f51a4a18 MX |
2173 | memcpy(csum, sum->sums + index, sctx->csum_size); |
2174 | if (index == num_sectors - 1) { | |
a2de733c AJ |
2175 | list_del(&sum->list); |
2176 | kfree(sum); | |
2177 | } | |
f51a4a18 | 2178 | return 1; |
a2de733c AJ |
2179 | } |
2180 | ||
2181 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
d9d181c1 | 2182 | static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2183 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac | 2184 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
a2de733c AJ |
2185 | { |
2186 | int ret; | |
2187 | u8 csum[BTRFS_CSUM_SIZE]; | |
b5d67f64 SB |
2188 | u32 blocksize; |
2189 | ||
2190 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
d9d181c1 SB |
2191 | blocksize = sctx->sectorsize; |
2192 | spin_lock(&sctx->stat_lock); | |
2193 | sctx->stat.data_extents_scrubbed++; | |
2194 | sctx->stat.data_bytes_scrubbed += len; | |
2195 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2196 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
ff023aac | 2197 | WARN_ON(sctx->nodesize != sctx->leafsize); |
d9d181c1 SB |
2198 | blocksize = sctx->nodesize; |
2199 | spin_lock(&sctx->stat_lock); | |
2200 | sctx->stat.tree_extents_scrubbed++; | |
2201 | sctx->stat.tree_bytes_scrubbed += len; | |
2202 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2203 | } else { |
d9d181c1 | 2204 | blocksize = sctx->sectorsize; |
ff023aac | 2205 | WARN_ON(1); |
b5d67f64 | 2206 | } |
a2de733c AJ |
2207 | |
2208 | while (len) { | |
b5d67f64 | 2209 | u64 l = min_t(u64, len, blocksize); |
a2de733c AJ |
2210 | int have_csum = 0; |
2211 | ||
2212 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2213 | /* push csums to sbio */ | |
d9d181c1 | 2214 | have_csum = scrub_find_csum(sctx, logical, l, csum); |
a2de733c | 2215 | if (have_csum == 0) |
d9d181c1 | 2216 | ++sctx->stat.no_csum; |
ff023aac SB |
2217 | if (sctx->is_dev_replace && !have_csum) { |
2218 | ret = copy_nocow_pages(sctx, logical, l, | |
2219 | mirror_num, | |
2220 | physical_for_dev_replace); | |
2221 | goto behind_scrub_pages; | |
2222 | } | |
a2de733c | 2223 | } |
a36cf8b8 | 2224 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
ff023aac SB |
2225 | mirror_num, have_csum ? csum : NULL, 0, |
2226 | physical_for_dev_replace); | |
2227 | behind_scrub_pages: | |
a2de733c AJ |
2228 | if (ret) |
2229 | return ret; | |
2230 | len -= l; | |
2231 | logical += l; | |
2232 | physical += l; | |
ff023aac | 2233 | physical_for_dev_replace += l; |
a2de733c AJ |
2234 | } |
2235 | return 0; | |
2236 | } | |
2237 | ||
d9d181c1 | 2238 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
a36cf8b8 SB |
2239 | struct map_lookup *map, |
2240 | struct btrfs_device *scrub_dev, | |
ff023aac SB |
2241 | int num, u64 base, u64 length, |
2242 | int is_dev_replace) | |
a2de733c AJ |
2243 | { |
2244 | struct btrfs_path *path; | |
a36cf8b8 | 2245 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
a2de733c AJ |
2246 | struct btrfs_root *root = fs_info->extent_root; |
2247 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2248 | struct btrfs_extent_item *extent; | |
e7786c3a | 2249 | struct blk_plug plug; |
a2de733c AJ |
2250 | u64 flags; |
2251 | int ret; | |
2252 | int slot; | |
a2de733c | 2253 | u64 nstripes; |
a2de733c AJ |
2254 | struct extent_buffer *l; |
2255 | struct btrfs_key key; | |
2256 | u64 physical; | |
2257 | u64 logical; | |
625f1c8d | 2258 | u64 logic_end; |
a2de733c | 2259 | u64 generation; |
e12fa9cd | 2260 | int mirror_num; |
7a26285e AJ |
2261 | struct reada_control *reada1; |
2262 | struct reada_control *reada2; | |
2263 | struct btrfs_key key_start; | |
2264 | struct btrfs_key key_end; | |
a2de733c AJ |
2265 | u64 increment = map->stripe_len; |
2266 | u64 offset; | |
ff023aac SB |
2267 | u64 extent_logical; |
2268 | u64 extent_physical; | |
2269 | u64 extent_len; | |
2270 | struct btrfs_device *extent_dev; | |
2271 | int extent_mirror_num; | |
625f1c8d | 2272 | int stop_loop; |
a2de733c | 2273 | |
53b381b3 DW |
2274 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | |
2275 | BTRFS_BLOCK_GROUP_RAID6)) { | |
2276 | if (num >= nr_data_stripes(map)) { | |
2277 | return 0; | |
2278 | } | |
2279 | } | |
2280 | ||
a2de733c AJ |
2281 | nstripes = length; |
2282 | offset = 0; | |
2283 | do_div(nstripes, map->stripe_len); | |
2284 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
2285 | offset = map->stripe_len * num; | |
2286 | increment = map->stripe_len * map->num_stripes; | |
193ea74b | 2287 | mirror_num = 1; |
a2de733c AJ |
2288 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
2289 | int factor = map->num_stripes / map->sub_stripes; | |
2290 | offset = map->stripe_len * (num / map->sub_stripes); | |
2291 | increment = map->stripe_len * factor; | |
193ea74b | 2292 | mirror_num = num % map->sub_stripes + 1; |
a2de733c AJ |
2293 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
2294 | increment = map->stripe_len; | |
193ea74b | 2295 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
2296 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
2297 | increment = map->stripe_len; | |
193ea74b | 2298 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
2299 | } else { |
2300 | increment = map->stripe_len; | |
193ea74b | 2301 | mirror_num = 1; |
a2de733c AJ |
2302 | } |
2303 | ||
2304 | path = btrfs_alloc_path(); | |
2305 | if (!path) | |
2306 | return -ENOMEM; | |
2307 | ||
b5d67f64 SB |
2308 | /* |
2309 | * work on commit root. The related disk blocks are static as | |
2310 | * long as COW is applied. This means, it is save to rewrite | |
2311 | * them to repair disk errors without any race conditions | |
2312 | */ | |
a2de733c AJ |
2313 | path->search_commit_root = 1; |
2314 | path->skip_locking = 1; | |
2315 | ||
2316 | /* | |
7a26285e AJ |
2317 | * trigger the readahead for extent tree csum tree and wait for |
2318 | * completion. During readahead, the scrub is officially paused | |
2319 | * to not hold off transaction commits | |
a2de733c AJ |
2320 | */ |
2321 | logical = base + offset; | |
a2de733c | 2322 | |
d9d181c1 | 2323 | wait_event(sctx->list_wait, |
b6bfebc1 | 2324 | atomic_read(&sctx->bios_in_flight) == 0); |
cb7ab021 | 2325 | scrub_blocked_if_needed(fs_info); |
7a26285e AJ |
2326 | |
2327 | /* FIXME it might be better to start readahead at commit root */ | |
2328 | key_start.objectid = logical; | |
2329 | key_start.type = BTRFS_EXTENT_ITEM_KEY; | |
2330 | key_start.offset = (u64)0; | |
2331 | key_end.objectid = base + offset + nstripes * increment; | |
3173a18f JB |
2332 | key_end.type = BTRFS_METADATA_ITEM_KEY; |
2333 | key_end.offset = (u64)-1; | |
7a26285e AJ |
2334 | reada1 = btrfs_reada_add(root, &key_start, &key_end); |
2335 | ||
2336 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
2337 | key_start.type = BTRFS_EXTENT_CSUM_KEY; | |
2338 | key_start.offset = logical; | |
2339 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
2340 | key_end.type = BTRFS_EXTENT_CSUM_KEY; | |
2341 | key_end.offset = base + offset + nstripes * increment; | |
2342 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); | |
2343 | ||
2344 | if (!IS_ERR(reada1)) | |
2345 | btrfs_reada_wait(reada1); | |
2346 | if (!IS_ERR(reada2)) | |
2347 | btrfs_reada_wait(reada2); | |
2348 | ||
a2de733c AJ |
2349 | |
2350 | /* | |
2351 | * collect all data csums for the stripe to avoid seeking during | |
2352 | * the scrub. This might currently (crc32) end up to be about 1MB | |
2353 | */ | |
e7786c3a | 2354 | blk_start_plug(&plug); |
a2de733c | 2355 | |
a2de733c AJ |
2356 | /* |
2357 | * now find all extents for each stripe and scrub them | |
2358 | */ | |
7a26285e AJ |
2359 | logical = base + offset; |
2360 | physical = map->stripes[num].physical; | |
625f1c8d | 2361 | logic_end = logical + increment * nstripes; |
a2de733c | 2362 | ret = 0; |
625f1c8d | 2363 | while (logical < logic_end) { |
a2de733c AJ |
2364 | /* |
2365 | * canceled? | |
2366 | */ | |
2367 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
d9d181c1 | 2368 | atomic_read(&sctx->cancel_req)) { |
a2de733c AJ |
2369 | ret = -ECANCELED; |
2370 | goto out; | |
2371 | } | |
2372 | /* | |
2373 | * check to see if we have to pause | |
2374 | */ | |
2375 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
2376 | /* push queued extents */ | |
ff023aac | 2377 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
d9d181c1 | 2378 | scrub_submit(sctx); |
ff023aac SB |
2379 | mutex_lock(&sctx->wr_ctx.wr_lock); |
2380 | scrub_wr_submit(sctx); | |
2381 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
d9d181c1 | 2382 | wait_event(sctx->list_wait, |
b6bfebc1 | 2383 | atomic_read(&sctx->bios_in_flight) == 0); |
ff023aac | 2384 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
3cb0929a | 2385 | scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
2386 | } |
2387 | ||
7c76edb7 WS |
2388 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
2389 | key.type = BTRFS_METADATA_ITEM_KEY; | |
2390 | else | |
2391 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
a2de733c | 2392 | key.objectid = logical; |
625f1c8d | 2393 | key.offset = (u64)-1; |
a2de733c AJ |
2394 | |
2395 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2396 | if (ret < 0) | |
2397 | goto out; | |
3173a18f | 2398 | |
8c51032f | 2399 | if (ret > 0) { |
ade2e0b3 | 2400 | ret = btrfs_previous_extent_item(root, path, 0); |
a2de733c AJ |
2401 | if (ret < 0) |
2402 | goto out; | |
8c51032f AJ |
2403 | if (ret > 0) { |
2404 | /* there's no smaller item, so stick with the | |
2405 | * larger one */ | |
2406 | btrfs_release_path(path); | |
2407 | ret = btrfs_search_slot(NULL, root, &key, | |
2408 | path, 0, 0); | |
2409 | if (ret < 0) | |
2410 | goto out; | |
2411 | } | |
a2de733c AJ |
2412 | } |
2413 | ||
625f1c8d | 2414 | stop_loop = 0; |
a2de733c | 2415 | while (1) { |
3173a18f JB |
2416 | u64 bytes; |
2417 | ||
a2de733c AJ |
2418 | l = path->nodes[0]; |
2419 | slot = path->slots[0]; | |
2420 | if (slot >= btrfs_header_nritems(l)) { | |
2421 | ret = btrfs_next_leaf(root, path); | |
2422 | if (ret == 0) | |
2423 | continue; | |
2424 | if (ret < 0) | |
2425 | goto out; | |
2426 | ||
625f1c8d | 2427 | stop_loop = 1; |
a2de733c AJ |
2428 | break; |
2429 | } | |
2430 | btrfs_item_key_to_cpu(l, &key, slot); | |
2431 | ||
3173a18f JB |
2432 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
2433 | bytes = root->leafsize; | |
2434 | else | |
2435 | bytes = key.offset; | |
2436 | ||
2437 | if (key.objectid + bytes <= logical) | |
a2de733c AJ |
2438 | goto next; |
2439 | ||
625f1c8d LB |
2440 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
2441 | key.type != BTRFS_METADATA_ITEM_KEY) | |
2442 | goto next; | |
a2de733c | 2443 | |
625f1c8d LB |
2444 | if (key.objectid >= logical + map->stripe_len) { |
2445 | /* out of this device extent */ | |
2446 | if (key.objectid >= logic_end) | |
2447 | stop_loop = 1; | |
2448 | break; | |
2449 | } | |
a2de733c AJ |
2450 | |
2451 | extent = btrfs_item_ptr(l, slot, | |
2452 | struct btrfs_extent_item); | |
2453 | flags = btrfs_extent_flags(l, extent); | |
2454 | generation = btrfs_extent_generation(l, extent); | |
2455 | ||
2456 | if (key.objectid < logical && | |
2457 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { | |
efe120a0 FH |
2458 | btrfs_err(fs_info, |
2459 | "scrub: tree block %llu spanning " | |
2460 | "stripes, ignored. logical=%llu", | |
c1c9ff7c | 2461 | key.objectid, logical); |
a2de733c AJ |
2462 | goto next; |
2463 | } | |
2464 | ||
625f1c8d LB |
2465 | again: |
2466 | extent_logical = key.objectid; | |
2467 | extent_len = bytes; | |
2468 | ||
a2de733c AJ |
2469 | /* |
2470 | * trim extent to this stripe | |
2471 | */ | |
625f1c8d LB |
2472 | if (extent_logical < logical) { |
2473 | extent_len -= logical - extent_logical; | |
2474 | extent_logical = logical; | |
a2de733c | 2475 | } |
625f1c8d | 2476 | if (extent_logical + extent_len > |
a2de733c | 2477 | logical + map->stripe_len) { |
625f1c8d LB |
2478 | extent_len = logical + map->stripe_len - |
2479 | extent_logical; | |
a2de733c AJ |
2480 | } |
2481 | ||
625f1c8d | 2482 | extent_physical = extent_logical - logical + physical; |
ff023aac SB |
2483 | extent_dev = scrub_dev; |
2484 | extent_mirror_num = mirror_num; | |
2485 | if (is_dev_replace) | |
2486 | scrub_remap_extent(fs_info, extent_logical, | |
2487 | extent_len, &extent_physical, | |
2488 | &extent_dev, | |
2489 | &extent_mirror_num); | |
625f1c8d LB |
2490 | |
2491 | ret = btrfs_lookup_csums_range(csum_root, logical, | |
2492 | logical + map->stripe_len - 1, | |
2493 | &sctx->csum_list, 1); | |
2494 | if (ret) | |
2495 | goto out; | |
2496 | ||
ff023aac SB |
2497 | ret = scrub_extent(sctx, extent_logical, extent_len, |
2498 | extent_physical, extent_dev, flags, | |
2499 | generation, extent_mirror_num, | |
115930cb | 2500 | extent_logical - logical + physical); |
a2de733c AJ |
2501 | if (ret) |
2502 | goto out; | |
2503 | ||
d88d46c6 | 2504 | scrub_free_csums(sctx); |
625f1c8d LB |
2505 | if (extent_logical + extent_len < |
2506 | key.objectid + bytes) { | |
2507 | logical += increment; | |
2508 | physical += map->stripe_len; | |
2509 | ||
2510 | if (logical < key.objectid + bytes) { | |
2511 | cond_resched(); | |
2512 | goto again; | |
2513 | } | |
2514 | ||
2515 | if (logical >= logic_end) { | |
2516 | stop_loop = 1; | |
2517 | break; | |
2518 | } | |
2519 | } | |
a2de733c AJ |
2520 | next: |
2521 | path->slots[0]++; | |
2522 | } | |
71267333 | 2523 | btrfs_release_path(path); |
a2de733c AJ |
2524 | logical += increment; |
2525 | physical += map->stripe_len; | |
d9d181c1 | 2526 | spin_lock(&sctx->stat_lock); |
625f1c8d LB |
2527 | if (stop_loop) |
2528 | sctx->stat.last_physical = map->stripes[num].physical + | |
2529 | length; | |
2530 | else | |
2531 | sctx->stat.last_physical = physical; | |
d9d181c1 | 2532 | spin_unlock(&sctx->stat_lock); |
625f1c8d LB |
2533 | if (stop_loop) |
2534 | break; | |
a2de733c | 2535 | } |
ff023aac | 2536 | out: |
a2de733c | 2537 | /* push queued extents */ |
d9d181c1 | 2538 | scrub_submit(sctx); |
ff023aac SB |
2539 | mutex_lock(&sctx->wr_ctx.wr_lock); |
2540 | scrub_wr_submit(sctx); | |
2541 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
a2de733c | 2542 | |
e7786c3a | 2543 | blk_finish_plug(&plug); |
a2de733c AJ |
2544 | btrfs_free_path(path); |
2545 | return ret < 0 ? ret : 0; | |
2546 | } | |
2547 | ||
d9d181c1 | 2548 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
a36cf8b8 SB |
2549 | struct btrfs_device *scrub_dev, |
2550 | u64 chunk_tree, u64 chunk_objectid, | |
2551 | u64 chunk_offset, u64 length, | |
ff023aac | 2552 | u64 dev_offset, int is_dev_replace) |
a2de733c AJ |
2553 | { |
2554 | struct btrfs_mapping_tree *map_tree = | |
a36cf8b8 | 2555 | &sctx->dev_root->fs_info->mapping_tree; |
a2de733c AJ |
2556 | struct map_lookup *map; |
2557 | struct extent_map *em; | |
2558 | int i; | |
ff023aac | 2559 | int ret = 0; |
a2de733c AJ |
2560 | |
2561 | read_lock(&map_tree->map_tree.lock); | |
2562 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | |
2563 | read_unlock(&map_tree->map_tree.lock); | |
2564 | ||
2565 | if (!em) | |
2566 | return -EINVAL; | |
2567 | ||
2568 | map = (struct map_lookup *)em->bdev; | |
2569 | if (em->start != chunk_offset) | |
2570 | goto out; | |
2571 | ||
2572 | if (em->len < length) | |
2573 | goto out; | |
2574 | ||
2575 | for (i = 0; i < map->num_stripes; ++i) { | |
a36cf8b8 | 2576 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
859acaf1 | 2577 | map->stripes[i].physical == dev_offset) { |
a36cf8b8 | 2578 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
ff023aac SB |
2579 | chunk_offset, length, |
2580 | is_dev_replace); | |
a2de733c AJ |
2581 | if (ret) |
2582 | goto out; | |
2583 | } | |
2584 | } | |
2585 | out: | |
2586 | free_extent_map(em); | |
2587 | ||
2588 | return ret; | |
2589 | } | |
2590 | ||
2591 | static noinline_for_stack | |
a36cf8b8 | 2592 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
ff023aac SB |
2593 | struct btrfs_device *scrub_dev, u64 start, u64 end, |
2594 | int is_dev_replace) | |
a2de733c AJ |
2595 | { |
2596 | struct btrfs_dev_extent *dev_extent = NULL; | |
2597 | struct btrfs_path *path; | |
a36cf8b8 | 2598 | struct btrfs_root *root = sctx->dev_root; |
a2de733c AJ |
2599 | struct btrfs_fs_info *fs_info = root->fs_info; |
2600 | u64 length; | |
2601 | u64 chunk_tree; | |
2602 | u64 chunk_objectid; | |
2603 | u64 chunk_offset; | |
2604 | int ret; | |
2605 | int slot; | |
2606 | struct extent_buffer *l; | |
2607 | struct btrfs_key key; | |
2608 | struct btrfs_key found_key; | |
2609 | struct btrfs_block_group_cache *cache; | |
ff023aac | 2610 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
a2de733c AJ |
2611 | |
2612 | path = btrfs_alloc_path(); | |
2613 | if (!path) | |
2614 | return -ENOMEM; | |
2615 | ||
2616 | path->reada = 2; | |
2617 | path->search_commit_root = 1; | |
2618 | path->skip_locking = 1; | |
2619 | ||
a36cf8b8 | 2620 | key.objectid = scrub_dev->devid; |
a2de733c AJ |
2621 | key.offset = 0ull; |
2622 | key.type = BTRFS_DEV_EXTENT_KEY; | |
2623 | ||
a2de733c AJ |
2624 | while (1) { |
2625 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2626 | if (ret < 0) | |
8c51032f AJ |
2627 | break; |
2628 | if (ret > 0) { | |
2629 | if (path->slots[0] >= | |
2630 | btrfs_header_nritems(path->nodes[0])) { | |
2631 | ret = btrfs_next_leaf(root, path); | |
2632 | if (ret) | |
2633 | break; | |
2634 | } | |
2635 | } | |
a2de733c AJ |
2636 | |
2637 | l = path->nodes[0]; | |
2638 | slot = path->slots[0]; | |
2639 | ||
2640 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
2641 | ||
a36cf8b8 | 2642 | if (found_key.objectid != scrub_dev->devid) |
a2de733c AJ |
2643 | break; |
2644 | ||
8c51032f | 2645 | if (btrfs_key_type(&found_key) != BTRFS_DEV_EXTENT_KEY) |
a2de733c AJ |
2646 | break; |
2647 | ||
2648 | if (found_key.offset >= end) | |
2649 | break; | |
2650 | ||
2651 | if (found_key.offset < key.offset) | |
2652 | break; | |
2653 | ||
2654 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
2655 | length = btrfs_dev_extent_length(l, dev_extent); | |
2656 | ||
2657 | if (found_key.offset + length <= start) { | |
2658 | key.offset = found_key.offset + length; | |
71267333 | 2659 | btrfs_release_path(path); |
a2de733c AJ |
2660 | continue; |
2661 | } | |
2662 | ||
2663 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
2664 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
2665 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
2666 | ||
2667 | /* | |
2668 | * get a reference on the corresponding block group to prevent | |
2669 | * the chunk from going away while we scrub it | |
2670 | */ | |
2671 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
2672 | if (!cache) { | |
2673 | ret = -ENOENT; | |
8c51032f | 2674 | break; |
a2de733c | 2675 | } |
ff023aac SB |
2676 | dev_replace->cursor_right = found_key.offset + length; |
2677 | dev_replace->cursor_left = found_key.offset; | |
2678 | dev_replace->item_needs_writeback = 1; | |
a36cf8b8 | 2679 | ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid, |
ff023aac SB |
2680 | chunk_offset, length, found_key.offset, |
2681 | is_dev_replace); | |
2682 | ||
2683 | /* | |
2684 | * flush, submit all pending read and write bios, afterwards | |
2685 | * wait for them. | |
2686 | * Note that in the dev replace case, a read request causes | |
2687 | * write requests that are submitted in the read completion | |
2688 | * worker. Therefore in the current situation, it is required | |
2689 | * that all write requests are flushed, so that all read and | |
2690 | * write requests are really completed when bios_in_flight | |
2691 | * changes to 0. | |
2692 | */ | |
2693 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); | |
2694 | scrub_submit(sctx); | |
2695 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2696 | scrub_wr_submit(sctx); | |
2697 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2698 | ||
2699 | wait_event(sctx->list_wait, | |
2700 | atomic_read(&sctx->bios_in_flight) == 0); | |
12cf9372 WS |
2701 | atomic_inc(&fs_info->scrubs_paused); |
2702 | wake_up(&fs_info->scrub_pause_wait); | |
2703 | ||
2704 | /* | |
2705 | * must be called before we decrease @scrub_paused. | |
2706 | * make sure we don't block transaction commit while | |
2707 | * we are waiting pending workers finished. | |
2708 | */ | |
ff023aac SB |
2709 | wait_event(sctx->list_wait, |
2710 | atomic_read(&sctx->workers_pending) == 0); | |
12cf9372 WS |
2711 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
2712 | ||
2713 | mutex_lock(&fs_info->scrub_lock); | |
2714 | __scrub_blocked_if_needed(fs_info); | |
2715 | atomic_dec(&fs_info->scrubs_paused); | |
2716 | mutex_unlock(&fs_info->scrub_lock); | |
2717 | wake_up(&fs_info->scrub_pause_wait); | |
ff023aac | 2718 | |
a2de733c AJ |
2719 | btrfs_put_block_group(cache); |
2720 | if (ret) | |
2721 | break; | |
af1be4f8 SB |
2722 | if (is_dev_replace && |
2723 | atomic64_read(&dev_replace->num_write_errors) > 0) { | |
ff023aac SB |
2724 | ret = -EIO; |
2725 | break; | |
2726 | } | |
2727 | if (sctx->stat.malloc_errors > 0) { | |
2728 | ret = -ENOMEM; | |
2729 | break; | |
2730 | } | |
a2de733c | 2731 | |
539f358a ID |
2732 | dev_replace->cursor_left = dev_replace->cursor_right; |
2733 | dev_replace->item_needs_writeback = 1; | |
2734 | ||
a2de733c | 2735 | key.offset = found_key.offset + length; |
71267333 | 2736 | btrfs_release_path(path); |
a2de733c AJ |
2737 | } |
2738 | ||
a2de733c | 2739 | btrfs_free_path(path); |
8c51032f AJ |
2740 | |
2741 | /* | |
2742 | * ret can still be 1 from search_slot or next_leaf, | |
2743 | * that's not an error | |
2744 | */ | |
2745 | return ret < 0 ? ret : 0; | |
a2de733c AJ |
2746 | } |
2747 | ||
a36cf8b8 SB |
2748 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
2749 | struct btrfs_device *scrub_dev) | |
a2de733c AJ |
2750 | { |
2751 | int i; | |
2752 | u64 bytenr; | |
2753 | u64 gen; | |
2754 | int ret; | |
a36cf8b8 | 2755 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 2756 | |
87533c47 | 2757 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
79787eaa JM |
2758 | return -EIO; |
2759 | ||
a2de733c AJ |
2760 | gen = root->fs_info->last_trans_committed; |
2761 | ||
2762 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
2763 | bytenr = btrfs_sb_offset(i); | |
a36cf8b8 | 2764 | if (bytenr + BTRFS_SUPER_INFO_SIZE > scrub_dev->total_bytes) |
a2de733c AJ |
2765 | break; |
2766 | ||
d9d181c1 | 2767 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
a36cf8b8 | 2768 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
ff023aac | 2769 | NULL, 1, bytenr); |
a2de733c AJ |
2770 | if (ret) |
2771 | return ret; | |
2772 | } | |
b6bfebc1 | 2773 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
2774 | |
2775 | return 0; | |
2776 | } | |
2777 | ||
2778 | /* | |
2779 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
2780 | */ | |
ff023aac SB |
2781 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
2782 | int is_dev_replace) | |
a2de733c | 2783 | { |
0dc3b84a | 2784 | int ret = 0; |
0339ef2f QW |
2785 | int flags = WQ_FREEZABLE | WQ_UNBOUND; |
2786 | int max_active = fs_info->thread_pool_size; | |
a2de733c | 2787 | |
632dd772 | 2788 | if (fs_info->scrub_workers_refcnt == 0) { |
ff023aac | 2789 | if (is_dev_replace) |
0339ef2f QW |
2790 | fs_info->scrub_workers = |
2791 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
2792 | 1, 4); | |
ff023aac | 2793 | else |
0339ef2f QW |
2794 | fs_info->scrub_workers = |
2795 | btrfs_alloc_workqueue("btrfs-scrub", flags, | |
2796 | max_active, 4); | |
2797 | if (!fs_info->scrub_workers) { | |
2798 | ret = -ENOMEM; | |
0dc3b84a | 2799 | goto out; |
0339ef2f QW |
2800 | } |
2801 | fs_info->scrub_wr_completion_workers = | |
2802 | btrfs_alloc_workqueue("btrfs-scrubwrc", flags, | |
2803 | max_active, 2); | |
2804 | if (!fs_info->scrub_wr_completion_workers) { | |
2805 | ret = -ENOMEM; | |
ff023aac | 2806 | goto out; |
0339ef2f QW |
2807 | } |
2808 | fs_info->scrub_nocow_workers = | |
2809 | btrfs_alloc_workqueue("btrfs-scrubnc", flags, 1, 0); | |
2810 | if (!fs_info->scrub_nocow_workers) { | |
2811 | ret = -ENOMEM; | |
ff023aac | 2812 | goto out; |
0339ef2f | 2813 | } |
632dd772 | 2814 | } |
a2de733c | 2815 | ++fs_info->scrub_workers_refcnt; |
0dc3b84a | 2816 | out: |
0dc3b84a | 2817 | return ret; |
a2de733c AJ |
2818 | } |
2819 | ||
aa1b8cd4 | 2820 | static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info) |
a2de733c | 2821 | { |
ff023aac | 2822 | if (--fs_info->scrub_workers_refcnt == 0) { |
0339ef2f QW |
2823 | btrfs_destroy_workqueue(fs_info->scrub_workers); |
2824 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); | |
2825 | btrfs_destroy_workqueue(fs_info->scrub_nocow_workers); | |
ff023aac | 2826 | } |
a2de733c | 2827 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
a2de733c AJ |
2828 | } |
2829 | ||
aa1b8cd4 SB |
2830 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
2831 | u64 end, struct btrfs_scrub_progress *progress, | |
63a212ab | 2832 | int readonly, int is_dev_replace) |
a2de733c | 2833 | { |
d9d181c1 | 2834 | struct scrub_ctx *sctx; |
a2de733c AJ |
2835 | int ret; |
2836 | struct btrfs_device *dev; | |
2837 | ||
aa1b8cd4 | 2838 | if (btrfs_fs_closing(fs_info)) |
a2de733c AJ |
2839 | return -EINVAL; |
2840 | ||
2841 | /* | |
2842 | * check some assumptions | |
2843 | */ | |
aa1b8cd4 | 2844 | if (fs_info->chunk_root->nodesize != fs_info->chunk_root->leafsize) { |
efe120a0 FH |
2845 | btrfs_err(fs_info, |
2846 | "scrub: size assumption nodesize == leafsize (%d == %d) fails", | |
aa1b8cd4 SB |
2847 | fs_info->chunk_root->nodesize, |
2848 | fs_info->chunk_root->leafsize); | |
b5d67f64 SB |
2849 | return -EINVAL; |
2850 | } | |
2851 | ||
aa1b8cd4 | 2852 | if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) { |
b5d67f64 SB |
2853 | /* |
2854 | * in this case scrub is unable to calculate the checksum | |
2855 | * the way scrub is implemented. Do not handle this | |
2856 | * situation at all because it won't ever happen. | |
2857 | */ | |
efe120a0 FH |
2858 | btrfs_err(fs_info, |
2859 | "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails", | |
aa1b8cd4 | 2860 | fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN); |
b5d67f64 SB |
2861 | return -EINVAL; |
2862 | } | |
2863 | ||
aa1b8cd4 | 2864 | if (fs_info->chunk_root->sectorsize != PAGE_SIZE) { |
b5d67f64 | 2865 | /* not supported for data w/o checksums */ |
efe120a0 FH |
2866 | btrfs_err(fs_info, |
2867 | "scrub: size assumption sectorsize != PAGE_SIZE " | |
2868 | "(%d != %lu) fails", | |
27f9f023 | 2869 | fs_info->chunk_root->sectorsize, PAGE_SIZE); |
a2de733c AJ |
2870 | return -EINVAL; |
2871 | } | |
2872 | ||
7a9e9987 SB |
2873 | if (fs_info->chunk_root->nodesize > |
2874 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || | |
2875 | fs_info->chunk_root->sectorsize > | |
2876 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { | |
2877 | /* | |
2878 | * would exhaust the array bounds of pagev member in | |
2879 | * struct scrub_block | |
2880 | */ | |
efe120a0 FH |
2881 | btrfs_err(fs_info, "scrub: size assumption nodesize and sectorsize " |
2882 | "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails", | |
7a9e9987 SB |
2883 | fs_info->chunk_root->nodesize, |
2884 | SCRUB_MAX_PAGES_PER_BLOCK, | |
2885 | fs_info->chunk_root->sectorsize, | |
2886 | SCRUB_MAX_PAGES_PER_BLOCK); | |
2887 | return -EINVAL; | |
2888 | } | |
2889 | ||
a2de733c | 2890 | |
aa1b8cd4 SB |
2891 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
2892 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); | |
63a212ab | 2893 | if (!dev || (dev->missing && !is_dev_replace)) { |
aa1b8cd4 | 2894 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
2895 | return -ENODEV; |
2896 | } | |
a2de733c | 2897 | |
3b7a016f | 2898 | mutex_lock(&fs_info->scrub_lock); |
63a212ab | 2899 | if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) { |
a2de733c | 2900 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 2901 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
aa1b8cd4 | 2902 | return -EIO; |
a2de733c AJ |
2903 | } |
2904 | ||
8dabb742 SB |
2905 | btrfs_dev_replace_lock(&fs_info->dev_replace); |
2906 | if (dev->scrub_device || | |
2907 | (!is_dev_replace && | |
2908 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { | |
2909 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
a2de733c | 2910 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 | 2911 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c AJ |
2912 | return -EINPROGRESS; |
2913 | } | |
8dabb742 | 2914 | btrfs_dev_replace_unlock(&fs_info->dev_replace); |
3b7a016f WS |
2915 | |
2916 | ret = scrub_workers_get(fs_info, is_dev_replace); | |
2917 | if (ret) { | |
2918 | mutex_unlock(&fs_info->scrub_lock); | |
2919 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
2920 | return ret; | |
2921 | } | |
2922 | ||
63a212ab | 2923 | sctx = scrub_setup_ctx(dev, is_dev_replace); |
d9d181c1 | 2924 | if (IS_ERR(sctx)) { |
a2de733c | 2925 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 SB |
2926 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
2927 | scrub_workers_put(fs_info); | |
d9d181c1 | 2928 | return PTR_ERR(sctx); |
a2de733c | 2929 | } |
d9d181c1 SB |
2930 | sctx->readonly = readonly; |
2931 | dev->scrub_device = sctx; | |
3cb0929a | 2932 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 2933 | |
3cb0929a WS |
2934 | /* |
2935 | * checking @scrub_pause_req here, we can avoid | |
2936 | * race between committing transaction and scrubbing. | |
2937 | */ | |
cb7ab021 | 2938 | __scrub_blocked_if_needed(fs_info); |
a2de733c AJ |
2939 | atomic_inc(&fs_info->scrubs_running); |
2940 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c | 2941 | |
ff023aac | 2942 | if (!is_dev_replace) { |
9b011adf WS |
2943 | /* |
2944 | * by holding device list mutex, we can | |
2945 | * kick off writing super in log tree sync. | |
2946 | */ | |
3cb0929a | 2947 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 2948 | ret = scrub_supers(sctx, dev); |
3cb0929a | 2949 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
ff023aac | 2950 | } |
a2de733c AJ |
2951 | |
2952 | if (!ret) | |
ff023aac SB |
2953 | ret = scrub_enumerate_chunks(sctx, dev, start, end, |
2954 | is_dev_replace); | |
a2de733c | 2955 | |
b6bfebc1 | 2956 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
2957 | atomic_dec(&fs_info->scrubs_running); |
2958 | wake_up(&fs_info->scrub_pause_wait); | |
2959 | ||
b6bfebc1 | 2960 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
0ef8e451 | 2961 | |
a2de733c | 2962 | if (progress) |
d9d181c1 | 2963 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
a2de733c AJ |
2964 | |
2965 | mutex_lock(&fs_info->scrub_lock); | |
2966 | dev->scrub_device = NULL; | |
3b7a016f | 2967 | scrub_workers_put(fs_info); |
a2de733c AJ |
2968 | mutex_unlock(&fs_info->scrub_lock); |
2969 | ||
d9d181c1 | 2970 | scrub_free_ctx(sctx); |
a2de733c AJ |
2971 | |
2972 | return ret; | |
2973 | } | |
2974 | ||
143bede5 | 2975 | void btrfs_scrub_pause(struct btrfs_root *root) |
a2de733c AJ |
2976 | { |
2977 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2978 | ||
2979 | mutex_lock(&fs_info->scrub_lock); | |
2980 | atomic_inc(&fs_info->scrub_pause_req); | |
2981 | while (atomic_read(&fs_info->scrubs_paused) != | |
2982 | atomic_read(&fs_info->scrubs_running)) { | |
2983 | mutex_unlock(&fs_info->scrub_lock); | |
2984 | wait_event(fs_info->scrub_pause_wait, | |
2985 | atomic_read(&fs_info->scrubs_paused) == | |
2986 | atomic_read(&fs_info->scrubs_running)); | |
2987 | mutex_lock(&fs_info->scrub_lock); | |
2988 | } | |
2989 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c AJ |
2990 | } |
2991 | ||
143bede5 | 2992 | void btrfs_scrub_continue(struct btrfs_root *root) |
a2de733c AJ |
2993 | { |
2994 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2995 | ||
2996 | atomic_dec(&fs_info->scrub_pause_req); | |
2997 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
2998 | } |
2999 | ||
aa1b8cd4 | 3000 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
a2de733c | 3001 | { |
a2de733c AJ |
3002 | mutex_lock(&fs_info->scrub_lock); |
3003 | if (!atomic_read(&fs_info->scrubs_running)) { | |
3004 | mutex_unlock(&fs_info->scrub_lock); | |
3005 | return -ENOTCONN; | |
3006 | } | |
3007 | ||
3008 | atomic_inc(&fs_info->scrub_cancel_req); | |
3009 | while (atomic_read(&fs_info->scrubs_running)) { | |
3010 | mutex_unlock(&fs_info->scrub_lock); | |
3011 | wait_event(fs_info->scrub_pause_wait, | |
3012 | atomic_read(&fs_info->scrubs_running) == 0); | |
3013 | mutex_lock(&fs_info->scrub_lock); | |
3014 | } | |
3015 | atomic_dec(&fs_info->scrub_cancel_req); | |
3016 | mutex_unlock(&fs_info->scrub_lock); | |
3017 | ||
3018 | return 0; | |
3019 | } | |
3020 | ||
aa1b8cd4 SB |
3021 | int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info, |
3022 | struct btrfs_device *dev) | |
49b25e05 | 3023 | { |
d9d181c1 | 3024 | struct scrub_ctx *sctx; |
a2de733c AJ |
3025 | |
3026 | mutex_lock(&fs_info->scrub_lock); | |
d9d181c1 SB |
3027 | sctx = dev->scrub_device; |
3028 | if (!sctx) { | |
a2de733c AJ |
3029 | mutex_unlock(&fs_info->scrub_lock); |
3030 | return -ENOTCONN; | |
3031 | } | |
d9d181c1 | 3032 | atomic_inc(&sctx->cancel_req); |
a2de733c AJ |
3033 | while (dev->scrub_device) { |
3034 | mutex_unlock(&fs_info->scrub_lock); | |
3035 | wait_event(fs_info->scrub_pause_wait, | |
3036 | dev->scrub_device == NULL); | |
3037 | mutex_lock(&fs_info->scrub_lock); | |
3038 | } | |
3039 | mutex_unlock(&fs_info->scrub_lock); | |
3040 | ||
3041 | return 0; | |
3042 | } | |
1623edeb | 3043 | |
a2de733c AJ |
3044 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, |
3045 | struct btrfs_scrub_progress *progress) | |
3046 | { | |
3047 | struct btrfs_device *dev; | |
d9d181c1 | 3048 | struct scrub_ctx *sctx = NULL; |
a2de733c AJ |
3049 | |
3050 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
aa1b8cd4 | 3051 | dev = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
a2de733c | 3052 | if (dev) |
d9d181c1 SB |
3053 | sctx = dev->scrub_device; |
3054 | if (sctx) | |
3055 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
a2de733c AJ |
3056 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
3057 | ||
d9d181c1 | 3058 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
a2de733c | 3059 | } |
ff023aac SB |
3060 | |
3061 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
3062 | u64 extent_logical, u64 extent_len, | |
3063 | u64 *extent_physical, | |
3064 | struct btrfs_device **extent_dev, | |
3065 | int *extent_mirror_num) | |
3066 | { | |
3067 | u64 mapped_length; | |
3068 | struct btrfs_bio *bbio = NULL; | |
3069 | int ret; | |
3070 | ||
3071 | mapped_length = extent_len; | |
3072 | ret = btrfs_map_block(fs_info, READ, extent_logical, | |
3073 | &mapped_length, &bbio, 0); | |
3074 | if (ret || !bbio || mapped_length < extent_len || | |
3075 | !bbio->stripes[0].dev->bdev) { | |
3076 | kfree(bbio); | |
3077 | return; | |
3078 | } | |
3079 | ||
3080 | *extent_physical = bbio->stripes[0].physical; | |
3081 | *extent_mirror_num = bbio->mirror_num; | |
3082 | *extent_dev = bbio->stripes[0].dev; | |
3083 | kfree(bbio); | |
3084 | } | |
3085 | ||
3086 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
3087 | struct scrub_wr_ctx *wr_ctx, | |
3088 | struct btrfs_fs_info *fs_info, | |
3089 | struct btrfs_device *dev, | |
3090 | int is_dev_replace) | |
3091 | { | |
3092 | WARN_ON(wr_ctx->wr_curr_bio != NULL); | |
3093 | ||
3094 | mutex_init(&wr_ctx->wr_lock); | |
3095 | wr_ctx->wr_curr_bio = NULL; | |
3096 | if (!is_dev_replace) | |
3097 | return 0; | |
3098 | ||
3099 | WARN_ON(!dev->bdev); | |
3100 | wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO, | |
3101 | bio_get_nr_vecs(dev->bdev)); | |
3102 | wr_ctx->tgtdev = dev; | |
3103 | atomic_set(&wr_ctx->flush_all_writes, 0); | |
3104 | return 0; | |
3105 | } | |
3106 | ||
3107 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx) | |
3108 | { | |
3109 | mutex_lock(&wr_ctx->wr_lock); | |
3110 | kfree(wr_ctx->wr_curr_bio); | |
3111 | wr_ctx->wr_curr_bio = NULL; | |
3112 | mutex_unlock(&wr_ctx->wr_lock); | |
3113 | } | |
3114 | ||
3115 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, | |
3116 | int mirror_num, u64 physical_for_dev_replace) | |
3117 | { | |
3118 | struct scrub_copy_nocow_ctx *nocow_ctx; | |
3119 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
3120 | ||
3121 | nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS); | |
3122 | if (!nocow_ctx) { | |
3123 | spin_lock(&sctx->stat_lock); | |
3124 | sctx->stat.malloc_errors++; | |
3125 | spin_unlock(&sctx->stat_lock); | |
3126 | return -ENOMEM; | |
3127 | } | |
3128 | ||
3129 | scrub_pending_trans_workers_inc(sctx); | |
3130 | ||
3131 | nocow_ctx->sctx = sctx; | |
3132 | nocow_ctx->logical = logical; | |
3133 | nocow_ctx->len = len; | |
3134 | nocow_ctx->mirror_num = mirror_num; | |
3135 | nocow_ctx->physical_for_dev_replace = physical_for_dev_replace; | |
0339ef2f | 3136 | btrfs_init_work(&nocow_ctx->work, copy_nocow_pages_worker, NULL, NULL); |
652f25a2 | 3137 | INIT_LIST_HEAD(&nocow_ctx->inodes); |
0339ef2f QW |
3138 | btrfs_queue_work(fs_info->scrub_nocow_workers, |
3139 | &nocow_ctx->work); | |
ff023aac SB |
3140 | |
3141 | return 0; | |
3142 | } | |
3143 | ||
652f25a2 JB |
3144 | static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx) |
3145 | { | |
3146 | struct scrub_copy_nocow_ctx *nocow_ctx = ctx; | |
3147 | struct scrub_nocow_inode *nocow_inode; | |
3148 | ||
3149 | nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS); | |
3150 | if (!nocow_inode) | |
3151 | return -ENOMEM; | |
3152 | nocow_inode->inum = inum; | |
3153 | nocow_inode->offset = offset; | |
3154 | nocow_inode->root = root; | |
3155 | list_add_tail(&nocow_inode->list, &nocow_ctx->inodes); | |
3156 | return 0; | |
3157 | } | |
3158 | ||
3159 | #define COPY_COMPLETE 1 | |
3160 | ||
d458b054 | 3161 | static void copy_nocow_pages_worker(struct btrfs_work *work) |
ff023aac SB |
3162 | { |
3163 | struct scrub_copy_nocow_ctx *nocow_ctx = | |
3164 | container_of(work, struct scrub_copy_nocow_ctx, work); | |
3165 | struct scrub_ctx *sctx = nocow_ctx->sctx; | |
3166 | u64 logical = nocow_ctx->logical; | |
3167 | u64 len = nocow_ctx->len; | |
3168 | int mirror_num = nocow_ctx->mirror_num; | |
3169 | u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; | |
3170 | int ret; | |
3171 | struct btrfs_trans_handle *trans = NULL; | |
3172 | struct btrfs_fs_info *fs_info; | |
3173 | struct btrfs_path *path; | |
3174 | struct btrfs_root *root; | |
3175 | int not_written = 0; | |
3176 | ||
3177 | fs_info = sctx->dev_root->fs_info; | |
3178 | root = fs_info->extent_root; | |
3179 | ||
3180 | path = btrfs_alloc_path(); | |
3181 | if (!path) { | |
3182 | spin_lock(&sctx->stat_lock); | |
3183 | sctx->stat.malloc_errors++; | |
3184 | spin_unlock(&sctx->stat_lock); | |
3185 | not_written = 1; | |
3186 | goto out; | |
3187 | } | |
3188 | ||
3189 | trans = btrfs_join_transaction(root); | |
3190 | if (IS_ERR(trans)) { | |
3191 | not_written = 1; | |
3192 | goto out; | |
3193 | } | |
3194 | ||
3195 | ret = iterate_inodes_from_logical(logical, fs_info, path, | |
652f25a2 | 3196 | record_inode_for_nocow, nocow_ctx); |
ff023aac | 3197 | if (ret != 0 && ret != -ENOENT) { |
efe120a0 FH |
3198 | btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, " |
3199 | "phys %llu, len %llu, mir %u, ret %d", | |
118a0a25 GU |
3200 | logical, physical_for_dev_replace, len, mirror_num, |
3201 | ret); | |
ff023aac SB |
3202 | not_written = 1; |
3203 | goto out; | |
3204 | } | |
3205 | ||
652f25a2 JB |
3206 | btrfs_end_transaction(trans, root); |
3207 | trans = NULL; | |
3208 | while (!list_empty(&nocow_ctx->inodes)) { | |
3209 | struct scrub_nocow_inode *entry; | |
3210 | entry = list_first_entry(&nocow_ctx->inodes, | |
3211 | struct scrub_nocow_inode, | |
3212 | list); | |
3213 | list_del_init(&entry->list); | |
3214 | ret = copy_nocow_pages_for_inode(entry->inum, entry->offset, | |
3215 | entry->root, nocow_ctx); | |
3216 | kfree(entry); | |
3217 | if (ret == COPY_COMPLETE) { | |
3218 | ret = 0; | |
3219 | break; | |
3220 | } else if (ret) { | |
3221 | break; | |
3222 | } | |
3223 | } | |
ff023aac | 3224 | out: |
652f25a2 JB |
3225 | while (!list_empty(&nocow_ctx->inodes)) { |
3226 | struct scrub_nocow_inode *entry; | |
3227 | entry = list_first_entry(&nocow_ctx->inodes, | |
3228 | struct scrub_nocow_inode, | |
3229 | list); | |
3230 | list_del_init(&entry->list); | |
3231 | kfree(entry); | |
3232 | } | |
ff023aac SB |
3233 | if (trans && !IS_ERR(trans)) |
3234 | btrfs_end_transaction(trans, root); | |
3235 | if (not_written) | |
3236 | btrfs_dev_replace_stats_inc(&fs_info->dev_replace. | |
3237 | num_uncorrectable_read_errors); | |
3238 | ||
3239 | btrfs_free_path(path); | |
3240 | kfree(nocow_ctx); | |
3241 | ||
3242 | scrub_pending_trans_workers_dec(sctx); | |
3243 | } | |
3244 | ||
652f25a2 JB |
3245 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, |
3246 | struct scrub_copy_nocow_ctx *nocow_ctx) | |
ff023aac | 3247 | { |
826aa0a8 | 3248 | struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info; |
ff023aac | 3249 | struct btrfs_key key; |
826aa0a8 MX |
3250 | struct inode *inode; |
3251 | struct page *page; | |
ff023aac | 3252 | struct btrfs_root *local_root; |
652f25a2 JB |
3253 | struct btrfs_ordered_extent *ordered; |
3254 | struct extent_map *em; | |
3255 | struct extent_state *cached_state = NULL; | |
3256 | struct extent_io_tree *io_tree; | |
ff023aac | 3257 | u64 physical_for_dev_replace; |
652f25a2 JB |
3258 | u64 len = nocow_ctx->len; |
3259 | u64 lockstart = offset, lockend = offset + len - 1; | |
826aa0a8 | 3260 | unsigned long index; |
6f1c3605 | 3261 | int srcu_index; |
652f25a2 JB |
3262 | int ret = 0; |
3263 | int err = 0; | |
ff023aac SB |
3264 | |
3265 | key.objectid = root; | |
3266 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3267 | key.offset = (u64)-1; | |
6f1c3605 LB |
3268 | |
3269 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
3270 | ||
ff023aac | 3271 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); |
6f1c3605 LB |
3272 | if (IS_ERR(local_root)) { |
3273 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
ff023aac | 3274 | return PTR_ERR(local_root); |
6f1c3605 | 3275 | } |
ff023aac SB |
3276 | |
3277 | key.type = BTRFS_INODE_ITEM_KEY; | |
3278 | key.objectid = inum; | |
3279 | key.offset = 0; | |
3280 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); | |
6f1c3605 | 3281 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
ff023aac SB |
3282 | if (IS_ERR(inode)) |
3283 | return PTR_ERR(inode); | |
3284 | ||
edd1400b MX |
3285 | /* Avoid truncate/dio/punch hole.. */ |
3286 | mutex_lock(&inode->i_mutex); | |
3287 | inode_dio_wait(inode); | |
3288 | ||
ff023aac | 3289 | physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; |
652f25a2 JB |
3290 | io_tree = &BTRFS_I(inode)->io_tree; |
3291 | ||
3292 | lock_extent_bits(io_tree, lockstart, lockend, 0, &cached_state); | |
3293 | ordered = btrfs_lookup_ordered_range(inode, lockstart, len); | |
3294 | if (ordered) { | |
3295 | btrfs_put_ordered_extent(ordered); | |
3296 | goto out_unlock; | |
3297 | } | |
3298 | ||
3299 | em = btrfs_get_extent(inode, NULL, 0, lockstart, len, 0); | |
3300 | if (IS_ERR(em)) { | |
3301 | ret = PTR_ERR(em); | |
3302 | goto out_unlock; | |
3303 | } | |
3304 | ||
3305 | /* | |
3306 | * This extent does not actually cover the logical extent anymore, | |
3307 | * move on to the next inode. | |
3308 | */ | |
3309 | if (em->block_start > nocow_ctx->logical || | |
3310 | em->block_start + em->block_len < nocow_ctx->logical + len) { | |
3311 | free_extent_map(em); | |
3312 | goto out_unlock; | |
3313 | } | |
3314 | free_extent_map(em); | |
3315 | ||
ff023aac | 3316 | while (len >= PAGE_CACHE_SIZE) { |
ff023aac | 3317 | index = offset >> PAGE_CACHE_SHIFT; |
edd1400b | 3318 | again: |
ff023aac SB |
3319 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
3320 | if (!page) { | |
efe120a0 | 3321 | btrfs_err(fs_info, "find_or_create_page() failed"); |
ff023aac | 3322 | ret = -ENOMEM; |
826aa0a8 | 3323 | goto out; |
ff023aac SB |
3324 | } |
3325 | ||
3326 | if (PageUptodate(page)) { | |
3327 | if (PageDirty(page)) | |
3328 | goto next_page; | |
3329 | } else { | |
3330 | ClearPageError(page); | |
652f25a2 JB |
3331 | err = extent_read_full_page_nolock(io_tree, page, |
3332 | btrfs_get_extent, | |
3333 | nocow_ctx->mirror_num); | |
826aa0a8 MX |
3334 | if (err) { |
3335 | ret = err; | |
ff023aac SB |
3336 | goto next_page; |
3337 | } | |
edd1400b | 3338 | |
26b25891 | 3339 | lock_page(page); |
edd1400b MX |
3340 | /* |
3341 | * If the page has been remove from the page cache, | |
3342 | * the data on it is meaningless, because it may be | |
3343 | * old one, the new data may be written into the new | |
3344 | * page in the page cache. | |
3345 | */ | |
3346 | if (page->mapping != inode->i_mapping) { | |
652f25a2 | 3347 | unlock_page(page); |
edd1400b MX |
3348 | page_cache_release(page); |
3349 | goto again; | |
3350 | } | |
ff023aac SB |
3351 | if (!PageUptodate(page)) { |
3352 | ret = -EIO; | |
3353 | goto next_page; | |
3354 | } | |
3355 | } | |
826aa0a8 MX |
3356 | err = write_page_nocow(nocow_ctx->sctx, |
3357 | physical_for_dev_replace, page); | |
3358 | if (err) | |
3359 | ret = err; | |
ff023aac | 3360 | next_page: |
826aa0a8 MX |
3361 | unlock_page(page); |
3362 | page_cache_release(page); | |
3363 | ||
3364 | if (ret) | |
3365 | break; | |
3366 | ||
ff023aac SB |
3367 | offset += PAGE_CACHE_SIZE; |
3368 | physical_for_dev_replace += PAGE_CACHE_SIZE; | |
3369 | len -= PAGE_CACHE_SIZE; | |
3370 | } | |
652f25a2 JB |
3371 | ret = COPY_COMPLETE; |
3372 | out_unlock: | |
3373 | unlock_extent_cached(io_tree, lockstart, lockend, &cached_state, | |
3374 | GFP_NOFS); | |
826aa0a8 | 3375 | out: |
edd1400b | 3376 | mutex_unlock(&inode->i_mutex); |
826aa0a8 | 3377 | iput(inode); |
ff023aac SB |
3378 | return ret; |
3379 | } | |
3380 | ||
3381 | static int write_page_nocow(struct scrub_ctx *sctx, | |
3382 | u64 physical_for_dev_replace, struct page *page) | |
3383 | { | |
3384 | struct bio *bio; | |
3385 | struct btrfs_device *dev; | |
3386 | int ret; | |
ff023aac SB |
3387 | |
3388 | dev = sctx->wr_ctx.tgtdev; | |
3389 | if (!dev) | |
3390 | return -EIO; | |
3391 | if (!dev->bdev) { | |
3392 | printk_ratelimited(KERN_WARNING | |
efe120a0 | 3393 | "BTRFS: scrub write_page_nocow(bdev == NULL) is unexpected!\n"); |
ff023aac SB |
3394 | return -EIO; |
3395 | } | |
9be3395b | 3396 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
ff023aac SB |
3397 | if (!bio) { |
3398 | spin_lock(&sctx->stat_lock); | |
3399 | sctx->stat.malloc_errors++; | |
3400 | spin_unlock(&sctx->stat_lock); | |
3401 | return -ENOMEM; | |
3402 | } | |
ff023aac SB |
3403 | bio->bi_size = 0; |
3404 | bio->bi_sector = physical_for_dev_replace >> 9; | |
3405 | bio->bi_bdev = dev->bdev; | |
3406 | ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); | |
3407 | if (ret != PAGE_CACHE_SIZE) { | |
3408 | leave_with_eio: | |
3409 | bio_put(bio); | |
3410 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); | |
3411 | return -EIO; | |
3412 | } | |
ff023aac | 3413 | |
c170bbb4 | 3414 | if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) |
ff023aac SB |
3415 | goto leave_with_eio; |
3416 | ||
3417 | bio_put(bio); | |
3418 | return 0; | |
3419 | } |