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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" |
a2de733c AJ |
31 | |
32 | /* | |
33 | * This is only the first step towards a full-features scrub. It reads all | |
34 | * extent and super block and verifies the checksums. In case a bad checksum | |
35 | * is found or the extent cannot be read, good data will be written back if | |
36 | * any can be found. | |
37 | * | |
38 | * Future enhancements: | |
a2de733c AJ |
39 | * - In case an unrepairable extent is encountered, track which files are |
40 | * affected and report them | |
a2de733c | 41 | * - track and record media errors, throw out bad devices |
a2de733c | 42 | * - add a mode to also read unallocated space |
a2de733c AJ |
43 | */ |
44 | ||
b5d67f64 | 45 | struct scrub_block; |
d9d181c1 | 46 | struct scrub_ctx; |
a2de733c | 47 | |
ff023aac SB |
48 | /* |
49 | * the following three values only influence the performance. | |
50 | * The last one configures the number of parallel and outstanding I/O | |
51 | * operations. The first two values configure an upper limit for the number | |
52 | * of (dynamically allocated) pages that are added to a bio. | |
53 | */ | |
54 | #define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */ | |
55 | #define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */ | |
56 | #define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */ | |
7a9e9987 SB |
57 | |
58 | /* | |
59 | * the following value times PAGE_SIZE needs to be large enough to match the | |
60 | * largest node/leaf/sector size that shall be supported. | |
61 | * Values larger than BTRFS_STRIPE_LEN are not supported. | |
62 | */ | |
b5d67f64 | 63 | #define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */ |
a2de733c AJ |
64 | |
65 | struct scrub_page { | |
b5d67f64 SB |
66 | struct scrub_block *sblock; |
67 | struct page *page; | |
442a4f63 | 68 | struct btrfs_device *dev; |
a2de733c AJ |
69 | u64 flags; /* extent flags */ |
70 | u64 generation; | |
b5d67f64 SB |
71 | u64 logical; |
72 | u64 physical; | |
ff023aac | 73 | u64 physical_for_dev_replace; |
7a9e9987 | 74 | atomic_t ref_count; |
b5d67f64 SB |
75 | struct { |
76 | unsigned int mirror_num:8; | |
77 | unsigned int have_csum:1; | |
78 | unsigned int io_error:1; | |
79 | }; | |
a2de733c AJ |
80 | u8 csum[BTRFS_CSUM_SIZE]; |
81 | }; | |
82 | ||
83 | struct scrub_bio { | |
84 | int index; | |
d9d181c1 | 85 | struct scrub_ctx *sctx; |
a36cf8b8 | 86 | struct btrfs_device *dev; |
a2de733c AJ |
87 | struct bio *bio; |
88 | int err; | |
89 | u64 logical; | |
90 | u64 physical; | |
ff023aac SB |
91 | #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO |
92 | struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO]; | |
93 | #else | |
94 | struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO]; | |
95 | #endif | |
b5d67f64 | 96 | int page_count; |
a2de733c AJ |
97 | int next_free; |
98 | struct btrfs_work work; | |
99 | }; | |
100 | ||
b5d67f64 | 101 | struct scrub_block { |
7a9e9987 | 102 | struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK]; |
b5d67f64 SB |
103 | int page_count; |
104 | atomic_t outstanding_pages; | |
105 | atomic_t ref_count; /* free mem on transition to zero */ | |
d9d181c1 | 106 | struct scrub_ctx *sctx; |
b5d67f64 SB |
107 | struct { |
108 | unsigned int header_error:1; | |
109 | unsigned int checksum_error:1; | |
110 | unsigned int no_io_error_seen:1; | |
442a4f63 | 111 | unsigned int generation_error:1; /* also sets header_error */ |
b5d67f64 SB |
112 | }; |
113 | }; | |
114 | ||
ff023aac SB |
115 | struct scrub_wr_ctx { |
116 | struct scrub_bio *wr_curr_bio; | |
117 | struct btrfs_device *tgtdev; | |
118 | int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */ | |
119 | atomic_t flush_all_writes; | |
120 | struct mutex wr_lock; | |
121 | }; | |
122 | ||
d9d181c1 | 123 | struct scrub_ctx { |
ff023aac | 124 | struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX]; |
a36cf8b8 | 125 | struct btrfs_root *dev_root; |
a2de733c AJ |
126 | int first_free; |
127 | int curr; | |
b6bfebc1 SB |
128 | atomic_t bios_in_flight; |
129 | atomic_t workers_pending; | |
a2de733c AJ |
130 | spinlock_t list_lock; |
131 | wait_queue_head_t list_wait; | |
132 | u16 csum_size; | |
133 | struct list_head csum_list; | |
134 | atomic_t cancel_req; | |
8628764e | 135 | int readonly; |
ff023aac | 136 | int pages_per_rd_bio; |
b5d67f64 SB |
137 | u32 sectorsize; |
138 | u32 nodesize; | |
139 | u32 leafsize; | |
63a212ab SB |
140 | |
141 | int is_dev_replace; | |
ff023aac | 142 | struct scrub_wr_ctx wr_ctx; |
63a212ab | 143 | |
a2de733c AJ |
144 | /* |
145 | * statistics | |
146 | */ | |
147 | struct btrfs_scrub_progress stat; | |
148 | spinlock_t stat_lock; | |
149 | }; | |
150 | ||
0ef8e451 | 151 | struct scrub_fixup_nodatasum { |
d9d181c1 | 152 | struct scrub_ctx *sctx; |
a36cf8b8 | 153 | struct btrfs_device *dev; |
0ef8e451 JS |
154 | u64 logical; |
155 | struct btrfs_root *root; | |
156 | struct btrfs_work work; | |
157 | int mirror_num; | |
158 | }; | |
159 | ||
ff023aac SB |
160 | struct scrub_copy_nocow_ctx { |
161 | struct scrub_ctx *sctx; | |
162 | u64 logical; | |
163 | u64 len; | |
164 | int mirror_num; | |
165 | u64 physical_for_dev_replace; | |
166 | struct btrfs_work work; | |
167 | }; | |
168 | ||
558540c1 JS |
169 | struct scrub_warning { |
170 | struct btrfs_path *path; | |
171 | u64 extent_item_size; | |
172 | char *scratch_buf; | |
173 | char *msg_buf; | |
174 | const char *errstr; | |
175 | sector_t sector; | |
176 | u64 logical; | |
177 | struct btrfs_device *dev; | |
178 | int msg_bufsize; | |
179 | int scratch_bufsize; | |
180 | }; | |
181 | ||
b5d67f64 | 182 | |
b6bfebc1 SB |
183 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx); |
184 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx); | |
185 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx); | |
186 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx); | |
b5d67f64 | 187 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check); |
d9d181c1 | 188 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
3ec706c8 | 189 | struct btrfs_fs_info *fs_info, |
ff023aac | 190 | struct scrub_block *original_sblock, |
b5d67f64 | 191 | u64 length, u64 logical, |
ff023aac | 192 | struct scrub_block *sblocks_for_recheck); |
34f5c8e9 SB |
193 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
194 | struct scrub_block *sblock, int is_metadata, | |
195 | int have_csum, u8 *csum, u64 generation, | |
196 | u16 csum_size); | |
b5d67f64 SB |
197 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
198 | struct scrub_block *sblock, | |
199 | int is_metadata, int have_csum, | |
200 | const u8 *csum, u64 generation, | |
201 | u16 csum_size); | |
202 | static void scrub_complete_bio_end_io(struct bio *bio, int err); | |
203 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, | |
204 | struct scrub_block *sblock_good, | |
205 | int force_write); | |
206 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
207 | struct scrub_block *sblock_good, | |
208 | int page_num, int force_write); | |
ff023aac SB |
209 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock); |
210 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
211 | int page_num); | |
b5d67f64 SB |
212 | static int scrub_checksum_data(struct scrub_block *sblock); |
213 | static int scrub_checksum_tree_block(struct scrub_block *sblock); | |
214 | static int scrub_checksum_super(struct scrub_block *sblock); | |
215 | static void scrub_block_get(struct scrub_block *sblock); | |
216 | static void scrub_block_put(struct scrub_block *sblock); | |
7a9e9987 SB |
217 | static void scrub_page_get(struct scrub_page *spage); |
218 | static void scrub_page_put(struct scrub_page *spage); | |
ff023aac SB |
219 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
220 | struct scrub_page *spage); | |
d9d181c1 | 221 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 222 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
223 | u64 gen, int mirror_num, u8 *csum, int force, |
224 | u64 physical_for_dev_replace); | |
1623edeb | 225 | static void scrub_bio_end_io(struct bio *bio, int err); |
b5d67f64 SB |
226 | static void scrub_bio_end_io_worker(struct btrfs_work *work); |
227 | static void scrub_block_complete(struct scrub_block *sblock); | |
ff023aac SB |
228 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, |
229 | u64 extent_logical, u64 extent_len, | |
230 | u64 *extent_physical, | |
231 | struct btrfs_device **extent_dev, | |
232 | int *extent_mirror_num); | |
233 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
234 | struct scrub_wr_ctx *wr_ctx, | |
235 | struct btrfs_fs_info *fs_info, | |
236 | struct btrfs_device *dev, | |
237 | int is_dev_replace); | |
238 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx); | |
239 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
240 | struct scrub_page *spage); | |
241 | static void scrub_wr_submit(struct scrub_ctx *sctx); | |
242 | static void scrub_wr_bio_end_io(struct bio *bio, int err); | |
243 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work); | |
244 | static int write_page_nocow(struct scrub_ctx *sctx, | |
245 | u64 physical_for_dev_replace, struct page *page); | |
246 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, | |
247 | void *ctx); | |
248 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, | |
249 | int mirror_num, u64 physical_for_dev_replace); | |
250 | static void copy_nocow_pages_worker(struct btrfs_work *work); | |
1623edeb SB |
251 | |
252 | ||
b6bfebc1 SB |
253 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx) |
254 | { | |
255 | atomic_inc(&sctx->bios_in_flight); | |
256 | } | |
257 | ||
258 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx) | |
259 | { | |
260 | atomic_dec(&sctx->bios_in_flight); | |
261 | wake_up(&sctx->list_wait); | |
262 | } | |
263 | ||
264 | /* | |
265 | * used for workers that require transaction commits (i.e., for the | |
266 | * NOCOW case) | |
267 | */ | |
268 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx) | |
269 | { | |
270 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
271 | ||
272 | /* | |
273 | * increment scrubs_running to prevent cancel requests from | |
274 | * completing as long as a worker is running. we must also | |
275 | * increment scrubs_paused to prevent deadlocking on pause | |
276 | * requests used for transactions commits (as the worker uses a | |
277 | * transaction context). it is safe to regard the worker | |
278 | * as paused for all matters practical. effectively, we only | |
279 | * avoid cancellation requests from completing. | |
280 | */ | |
281 | mutex_lock(&fs_info->scrub_lock); | |
282 | atomic_inc(&fs_info->scrubs_running); | |
283 | atomic_inc(&fs_info->scrubs_paused); | |
284 | mutex_unlock(&fs_info->scrub_lock); | |
285 | atomic_inc(&sctx->workers_pending); | |
286 | } | |
287 | ||
288 | /* used for workers that require transaction commits */ | |
289 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx) | |
290 | { | |
291 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
292 | ||
293 | /* | |
294 | * see scrub_pending_trans_workers_inc() why we're pretending | |
295 | * to be paused in the scrub counters | |
296 | */ | |
297 | mutex_lock(&fs_info->scrub_lock); | |
298 | atomic_dec(&fs_info->scrubs_running); | |
299 | atomic_dec(&fs_info->scrubs_paused); | |
300 | mutex_unlock(&fs_info->scrub_lock); | |
301 | atomic_dec(&sctx->workers_pending); | |
302 | wake_up(&fs_info->scrub_pause_wait); | |
303 | wake_up(&sctx->list_wait); | |
304 | } | |
305 | ||
d9d181c1 | 306 | static void scrub_free_csums(struct scrub_ctx *sctx) |
a2de733c | 307 | { |
d9d181c1 | 308 | while (!list_empty(&sctx->csum_list)) { |
a2de733c | 309 | struct btrfs_ordered_sum *sum; |
d9d181c1 | 310 | sum = list_first_entry(&sctx->csum_list, |
a2de733c AJ |
311 | struct btrfs_ordered_sum, list); |
312 | list_del(&sum->list); | |
313 | kfree(sum); | |
314 | } | |
315 | } | |
316 | ||
d9d181c1 | 317 | static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) |
a2de733c AJ |
318 | { |
319 | int i; | |
a2de733c | 320 | |
d9d181c1 | 321 | if (!sctx) |
a2de733c AJ |
322 | return; |
323 | ||
ff023aac SB |
324 | scrub_free_wr_ctx(&sctx->wr_ctx); |
325 | ||
b5d67f64 | 326 | /* this can happen when scrub is cancelled */ |
d9d181c1 SB |
327 | if (sctx->curr != -1) { |
328 | struct scrub_bio *sbio = sctx->bios[sctx->curr]; | |
b5d67f64 SB |
329 | |
330 | for (i = 0; i < sbio->page_count; i++) { | |
ff023aac | 331 | WARN_ON(!sbio->pagev[i]->page); |
b5d67f64 SB |
332 | scrub_block_put(sbio->pagev[i]->sblock); |
333 | } | |
334 | bio_put(sbio->bio); | |
335 | } | |
336 | ||
ff023aac | 337 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
d9d181c1 | 338 | struct scrub_bio *sbio = sctx->bios[i]; |
a2de733c AJ |
339 | |
340 | if (!sbio) | |
341 | break; | |
a2de733c AJ |
342 | kfree(sbio); |
343 | } | |
344 | ||
d9d181c1 SB |
345 | scrub_free_csums(sctx); |
346 | kfree(sctx); | |
a2de733c AJ |
347 | } |
348 | ||
349 | static noinline_for_stack | |
63a212ab | 350 | struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace) |
a2de733c | 351 | { |
d9d181c1 | 352 | struct scrub_ctx *sctx; |
a2de733c | 353 | int i; |
a2de733c | 354 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
ff023aac SB |
355 | int pages_per_rd_bio; |
356 | int ret; | |
a2de733c | 357 | |
ff023aac SB |
358 | /* |
359 | * the setting of pages_per_rd_bio is correct for scrub but might | |
360 | * be wrong for the dev_replace code where we might read from | |
361 | * different devices in the initial huge bios. However, that | |
362 | * code is able to correctly handle the case when adding a page | |
363 | * to a bio fails. | |
364 | */ | |
365 | if (dev->bdev) | |
366 | pages_per_rd_bio = min_t(int, SCRUB_PAGES_PER_RD_BIO, | |
367 | bio_get_nr_vecs(dev->bdev)); | |
368 | else | |
369 | pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; | |
d9d181c1 SB |
370 | sctx = kzalloc(sizeof(*sctx), GFP_NOFS); |
371 | if (!sctx) | |
a2de733c | 372 | goto nomem; |
63a212ab | 373 | sctx->is_dev_replace = is_dev_replace; |
ff023aac | 374 | sctx->pages_per_rd_bio = pages_per_rd_bio; |
d9d181c1 | 375 | sctx->curr = -1; |
a36cf8b8 | 376 | sctx->dev_root = dev->dev_root; |
ff023aac | 377 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
a2de733c AJ |
378 | struct scrub_bio *sbio; |
379 | ||
380 | sbio = kzalloc(sizeof(*sbio), GFP_NOFS); | |
381 | if (!sbio) | |
382 | goto nomem; | |
d9d181c1 | 383 | sctx->bios[i] = sbio; |
a2de733c | 384 | |
a2de733c | 385 | sbio->index = i; |
d9d181c1 | 386 | sbio->sctx = sctx; |
b5d67f64 SB |
387 | sbio->page_count = 0; |
388 | sbio->work.func = scrub_bio_end_io_worker; | |
a2de733c | 389 | |
ff023aac | 390 | if (i != SCRUB_BIOS_PER_SCTX - 1) |
d9d181c1 | 391 | sctx->bios[i]->next_free = i + 1; |
0ef8e451 | 392 | else |
d9d181c1 SB |
393 | sctx->bios[i]->next_free = -1; |
394 | } | |
395 | sctx->first_free = 0; | |
396 | sctx->nodesize = dev->dev_root->nodesize; | |
397 | sctx->leafsize = dev->dev_root->leafsize; | |
398 | sctx->sectorsize = dev->dev_root->sectorsize; | |
b6bfebc1 SB |
399 | atomic_set(&sctx->bios_in_flight, 0); |
400 | atomic_set(&sctx->workers_pending, 0); | |
d9d181c1 SB |
401 | atomic_set(&sctx->cancel_req, 0); |
402 | sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
403 | INIT_LIST_HEAD(&sctx->csum_list); | |
404 | ||
405 | spin_lock_init(&sctx->list_lock); | |
406 | spin_lock_init(&sctx->stat_lock); | |
407 | init_waitqueue_head(&sctx->list_wait); | |
ff023aac SB |
408 | |
409 | ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info, | |
410 | fs_info->dev_replace.tgtdev, is_dev_replace); | |
411 | if (ret) { | |
412 | scrub_free_ctx(sctx); | |
413 | return ERR_PTR(ret); | |
414 | } | |
d9d181c1 | 415 | return sctx; |
a2de733c AJ |
416 | |
417 | nomem: | |
d9d181c1 | 418 | scrub_free_ctx(sctx); |
a2de733c AJ |
419 | return ERR_PTR(-ENOMEM); |
420 | } | |
421 | ||
ff023aac SB |
422 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, |
423 | void *warn_ctx) | |
558540c1 JS |
424 | { |
425 | u64 isize; | |
426 | u32 nlink; | |
427 | int ret; | |
428 | int i; | |
429 | struct extent_buffer *eb; | |
430 | struct btrfs_inode_item *inode_item; | |
ff023aac | 431 | struct scrub_warning *swarn = warn_ctx; |
558540c1 JS |
432 | struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; |
433 | struct inode_fs_paths *ipath = NULL; | |
434 | struct btrfs_root *local_root; | |
435 | struct btrfs_key root_key; | |
436 | ||
437 | root_key.objectid = root; | |
438 | root_key.type = BTRFS_ROOT_ITEM_KEY; | |
439 | root_key.offset = (u64)-1; | |
440 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); | |
441 | if (IS_ERR(local_root)) { | |
442 | ret = PTR_ERR(local_root); | |
443 | goto err; | |
444 | } | |
445 | ||
446 | ret = inode_item_info(inum, 0, local_root, swarn->path); | |
447 | if (ret) { | |
448 | btrfs_release_path(swarn->path); | |
449 | goto err; | |
450 | } | |
451 | ||
452 | eb = swarn->path->nodes[0]; | |
453 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], | |
454 | struct btrfs_inode_item); | |
455 | isize = btrfs_inode_size(eb, inode_item); | |
456 | nlink = btrfs_inode_nlink(eb, inode_item); | |
457 | btrfs_release_path(swarn->path); | |
458 | ||
459 | ipath = init_ipath(4096, local_root, swarn->path); | |
26bdef54 DC |
460 | if (IS_ERR(ipath)) { |
461 | ret = PTR_ERR(ipath); | |
462 | ipath = NULL; | |
463 | goto err; | |
464 | } | |
558540c1 JS |
465 | ret = paths_from_inode(inum, ipath); |
466 | ||
467 | if (ret < 0) | |
468 | goto err; | |
469 | ||
470 | /* | |
471 | * we deliberately ignore the bit ipath might have been too small to | |
472 | * hold all of the paths here | |
473 | */ | |
474 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) | |
606686ee | 475 | printk_in_rcu(KERN_WARNING "btrfs: %s at logical %llu on dev " |
558540c1 JS |
476 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " |
477 | "length %llu, links %u (path: %s)\n", swarn->errstr, | |
606686ee | 478 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
479 | (unsigned long long)swarn->sector, root, inum, offset, |
480 | min(isize - offset, (u64)PAGE_SIZE), nlink, | |
745c4d8e | 481 | (char *)(unsigned long)ipath->fspath->val[i]); |
558540c1 JS |
482 | |
483 | free_ipath(ipath); | |
484 | return 0; | |
485 | ||
486 | err: | |
606686ee | 487 | printk_in_rcu(KERN_WARNING "btrfs: %s at logical %llu on dev " |
558540c1 JS |
488 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " |
489 | "resolving failed with ret=%d\n", swarn->errstr, | |
606686ee | 490 | swarn->logical, rcu_str_deref(swarn->dev->name), |
558540c1 JS |
491 | (unsigned long long)swarn->sector, root, inum, offset, ret); |
492 | ||
493 | free_ipath(ipath); | |
494 | return 0; | |
495 | } | |
496 | ||
b5d67f64 | 497 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
558540c1 | 498 | { |
a36cf8b8 SB |
499 | struct btrfs_device *dev; |
500 | struct btrfs_fs_info *fs_info; | |
558540c1 JS |
501 | struct btrfs_path *path; |
502 | struct btrfs_key found_key; | |
503 | struct extent_buffer *eb; | |
504 | struct btrfs_extent_item *ei; | |
505 | struct scrub_warning swarn; | |
69917e43 LB |
506 | unsigned long ptr = 0; |
507 | u64 extent_item_pos; | |
508 | u64 flags = 0; | |
558540c1 | 509 | u64 ref_root; |
69917e43 | 510 | u32 item_size; |
558540c1 | 511 | u8 ref_level; |
558540c1 | 512 | const int bufsize = 4096; |
69917e43 | 513 | int ret; |
558540c1 | 514 | |
a36cf8b8 | 515 | WARN_ON(sblock->page_count < 1); |
7a9e9987 | 516 | dev = sblock->pagev[0]->dev; |
a36cf8b8 SB |
517 | fs_info = sblock->sctx->dev_root->fs_info; |
518 | ||
558540c1 JS |
519 | path = btrfs_alloc_path(); |
520 | ||
521 | swarn.scratch_buf = kmalloc(bufsize, GFP_NOFS); | |
522 | swarn.msg_buf = kmalloc(bufsize, GFP_NOFS); | |
7a9e9987 SB |
523 | swarn.sector = (sblock->pagev[0]->physical) >> 9; |
524 | swarn.logical = sblock->pagev[0]->logical; | |
558540c1 | 525 | swarn.errstr = errstr; |
a36cf8b8 | 526 | swarn.dev = NULL; |
558540c1 JS |
527 | swarn.msg_bufsize = bufsize; |
528 | swarn.scratch_bufsize = bufsize; | |
529 | ||
530 | if (!path || !swarn.scratch_buf || !swarn.msg_buf) | |
531 | goto out; | |
532 | ||
69917e43 LB |
533 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, |
534 | &flags); | |
558540c1 JS |
535 | if (ret < 0) |
536 | goto out; | |
537 | ||
4692cf58 | 538 | extent_item_pos = swarn.logical - found_key.objectid; |
558540c1 JS |
539 | swarn.extent_item_size = found_key.offset; |
540 | ||
541 | eb = path->nodes[0]; | |
542 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); | |
543 | item_size = btrfs_item_size_nr(eb, path->slots[0]); | |
4692cf58 | 544 | btrfs_release_path(path); |
558540c1 | 545 | |
69917e43 | 546 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
558540c1 JS |
547 | do { |
548 | ret = tree_backref_for_extent(&ptr, eb, ei, item_size, | |
549 | &ref_root, &ref_level); | |
606686ee | 550 | printk_in_rcu(KERN_WARNING |
1623edeb | 551 | "btrfs: %s at logical %llu on dev %s, " |
558540c1 | 552 | "sector %llu: metadata %s (level %d) in tree " |
606686ee JB |
553 | "%llu\n", errstr, swarn.logical, |
554 | rcu_str_deref(dev->name), | |
558540c1 JS |
555 | (unsigned long long)swarn.sector, |
556 | ref_level ? "node" : "leaf", | |
557 | ret < 0 ? -1 : ref_level, | |
558 | ret < 0 ? -1 : ref_root); | |
559 | } while (ret != 1); | |
560 | } else { | |
561 | swarn.path = path; | |
a36cf8b8 | 562 | swarn.dev = dev; |
7a3ae2f8 JS |
563 | iterate_extent_inodes(fs_info, found_key.objectid, |
564 | extent_item_pos, 1, | |
558540c1 JS |
565 | scrub_print_warning_inode, &swarn); |
566 | } | |
567 | ||
568 | out: | |
569 | btrfs_free_path(path); | |
570 | kfree(swarn.scratch_buf); | |
571 | kfree(swarn.msg_buf); | |
572 | } | |
573 | ||
ff023aac | 574 | static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx) |
0ef8e451 | 575 | { |
5da6fcbc | 576 | struct page *page = NULL; |
0ef8e451 | 577 | unsigned long index; |
ff023aac | 578 | struct scrub_fixup_nodatasum *fixup = fixup_ctx; |
0ef8e451 | 579 | int ret; |
5da6fcbc | 580 | int corrected = 0; |
0ef8e451 | 581 | struct btrfs_key key; |
5da6fcbc | 582 | struct inode *inode = NULL; |
0ef8e451 JS |
583 | u64 end = offset + PAGE_SIZE - 1; |
584 | struct btrfs_root *local_root; | |
585 | ||
586 | key.objectid = root; | |
587 | key.type = BTRFS_ROOT_ITEM_KEY; | |
588 | key.offset = (u64)-1; | |
589 | local_root = btrfs_read_fs_root_no_name(fixup->root->fs_info, &key); | |
590 | if (IS_ERR(local_root)) | |
591 | return PTR_ERR(local_root); | |
592 | ||
593 | key.type = BTRFS_INODE_ITEM_KEY; | |
594 | key.objectid = inum; | |
595 | key.offset = 0; | |
596 | inode = btrfs_iget(fixup->root->fs_info->sb, &key, local_root, NULL); | |
597 | if (IS_ERR(inode)) | |
598 | return PTR_ERR(inode); | |
599 | ||
0ef8e451 JS |
600 | index = offset >> PAGE_CACHE_SHIFT; |
601 | ||
602 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
5da6fcbc JS |
603 | if (!page) { |
604 | ret = -ENOMEM; | |
605 | goto out; | |
606 | } | |
607 | ||
608 | if (PageUptodate(page)) { | |
3ec706c8 | 609 | struct btrfs_fs_info *fs_info; |
5da6fcbc JS |
610 | if (PageDirty(page)) { |
611 | /* | |
612 | * we need to write the data to the defect sector. the | |
613 | * data that was in that sector is not in memory, | |
614 | * because the page was modified. we must not write the | |
615 | * modified page to that sector. | |
616 | * | |
617 | * TODO: what could be done here: wait for the delalloc | |
618 | * runner to write out that page (might involve | |
619 | * COW) and see whether the sector is still | |
620 | * referenced afterwards. | |
621 | * | |
622 | * For the meantime, we'll treat this error | |
623 | * incorrectable, although there is a chance that a | |
624 | * later scrub will find the bad sector again and that | |
625 | * there's no dirty page in memory, then. | |
626 | */ | |
627 | ret = -EIO; | |
628 | goto out; | |
629 | } | |
3ec706c8 SB |
630 | fs_info = BTRFS_I(inode)->root->fs_info; |
631 | ret = repair_io_failure(fs_info, offset, PAGE_SIZE, | |
5da6fcbc JS |
632 | fixup->logical, page, |
633 | fixup->mirror_num); | |
634 | unlock_page(page); | |
635 | corrected = !ret; | |
636 | } else { | |
637 | /* | |
638 | * we need to get good data first. the general readpage path | |
639 | * will call repair_io_failure for us, we just have to make | |
640 | * sure we read the bad mirror. | |
641 | */ | |
642 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
643 | EXTENT_DAMAGED, GFP_NOFS); | |
644 | if (ret) { | |
645 | /* set_extent_bits should give proper error */ | |
646 | WARN_ON(ret > 0); | |
647 | if (ret > 0) | |
648 | ret = -EFAULT; | |
649 | goto out; | |
650 | } | |
651 | ||
652 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, | |
653 | btrfs_get_extent, | |
654 | fixup->mirror_num); | |
655 | wait_on_page_locked(page); | |
656 | ||
657 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, | |
658 | end, EXTENT_DAMAGED, 0, NULL); | |
659 | if (!corrected) | |
660 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
661 | EXTENT_DAMAGED, GFP_NOFS); | |
662 | } | |
663 | ||
664 | out: | |
665 | if (page) | |
666 | put_page(page); | |
667 | if (inode) | |
668 | iput(inode); | |
0ef8e451 JS |
669 | |
670 | if (ret < 0) | |
671 | return ret; | |
672 | ||
673 | if (ret == 0 && corrected) { | |
674 | /* | |
675 | * we only need to call readpage for one of the inodes belonging | |
676 | * to this extent. so make iterate_extent_inodes stop | |
677 | */ | |
678 | return 1; | |
679 | } | |
680 | ||
681 | return -EIO; | |
682 | } | |
683 | ||
684 | static void scrub_fixup_nodatasum(struct btrfs_work *work) | |
685 | { | |
686 | int ret; | |
687 | struct scrub_fixup_nodatasum *fixup; | |
d9d181c1 | 688 | struct scrub_ctx *sctx; |
0ef8e451 JS |
689 | struct btrfs_trans_handle *trans = NULL; |
690 | struct btrfs_fs_info *fs_info; | |
691 | struct btrfs_path *path; | |
692 | int uncorrectable = 0; | |
693 | ||
694 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); | |
d9d181c1 | 695 | sctx = fixup->sctx; |
0ef8e451 JS |
696 | fs_info = fixup->root->fs_info; |
697 | ||
698 | path = btrfs_alloc_path(); | |
699 | if (!path) { | |
d9d181c1 SB |
700 | spin_lock(&sctx->stat_lock); |
701 | ++sctx->stat.malloc_errors; | |
702 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
703 | uncorrectable = 1; |
704 | goto out; | |
705 | } | |
706 | ||
707 | trans = btrfs_join_transaction(fixup->root); | |
708 | if (IS_ERR(trans)) { | |
709 | uncorrectable = 1; | |
710 | goto out; | |
711 | } | |
712 | ||
713 | /* | |
714 | * the idea is to trigger a regular read through the standard path. we | |
715 | * read a page from the (failed) logical address by specifying the | |
716 | * corresponding copynum of the failed sector. thus, that readpage is | |
717 | * expected to fail. | |
718 | * that is the point where on-the-fly error correction will kick in | |
719 | * (once it's finished) and rewrite the failed sector if a good copy | |
720 | * can be found. | |
721 | */ | |
722 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, | |
723 | path, scrub_fixup_readpage, | |
724 | fixup); | |
725 | if (ret < 0) { | |
726 | uncorrectable = 1; | |
727 | goto out; | |
728 | } | |
729 | WARN_ON(ret != 1); | |
730 | ||
d9d181c1 SB |
731 | spin_lock(&sctx->stat_lock); |
732 | ++sctx->stat.corrected_errors; | |
733 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
734 | |
735 | out: | |
736 | if (trans && !IS_ERR(trans)) | |
737 | btrfs_end_transaction(trans, fixup->root); | |
738 | if (uncorrectable) { | |
d9d181c1 SB |
739 | spin_lock(&sctx->stat_lock); |
740 | ++sctx->stat.uncorrectable_errors; | |
741 | spin_unlock(&sctx->stat_lock); | |
ff023aac SB |
742 | btrfs_dev_replace_stats_inc( |
743 | &sctx->dev_root->fs_info->dev_replace. | |
744 | num_uncorrectable_read_errors); | |
606686ee | 745 | printk_ratelimited_in_rcu(KERN_ERR |
b5d67f64 | 746 | "btrfs: unable to fixup (nodatasum) error at logical %llu on dev %s\n", |
606686ee | 747 | (unsigned long long)fixup->logical, |
a36cf8b8 | 748 | rcu_str_deref(fixup->dev->name)); |
0ef8e451 JS |
749 | } |
750 | ||
751 | btrfs_free_path(path); | |
752 | kfree(fixup); | |
753 | ||
b6bfebc1 | 754 | scrub_pending_trans_workers_dec(sctx); |
0ef8e451 JS |
755 | } |
756 | ||
a2de733c | 757 | /* |
b5d67f64 SB |
758 | * scrub_handle_errored_block gets called when either verification of the |
759 | * pages failed or the bio failed to read, e.g. with EIO. In the latter | |
760 | * case, this function handles all pages in the bio, even though only one | |
761 | * may be bad. | |
762 | * The goal of this function is to repair the errored block by using the | |
763 | * contents of one of the mirrors. | |
a2de733c | 764 | */ |
b5d67f64 | 765 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
a2de733c | 766 | { |
d9d181c1 | 767 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
a36cf8b8 | 768 | struct btrfs_device *dev; |
b5d67f64 SB |
769 | struct btrfs_fs_info *fs_info; |
770 | u64 length; | |
771 | u64 logical; | |
772 | u64 generation; | |
773 | unsigned int failed_mirror_index; | |
774 | unsigned int is_metadata; | |
775 | unsigned int have_csum; | |
776 | u8 *csum; | |
777 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ | |
778 | struct scrub_block *sblock_bad; | |
779 | int ret; | |
780 | int mirror_index; | |
781 | int page_num; | |
782 | int success; | |
558540c1 | 783 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
b5d67f64 SB |
784 | DEFAULT_RATELIMIT_BURST); |
785 | ||
786 | BUG_ON(sblock_to_check->page_count < 1); | |
a36cf8b8 | 787 | fs_info = sctx->dev_root->fs_info; |
4ded4f63 SB |
788 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
789 | /* | |
790 | * if we find an error in a super block, we just report it. | |
791 | * They will get written with the next transaction commit | |
792 | * anyway | |
793 | */ | |
794 | spin_lock(&sctx->stat_lock); | |
795 | ++sctx->stat.super_errors; | |
796 | spin_unlock(&sctx->stat_lock); | |
797 | return 0; | |
798 | } | |
b5d67f64 | 799 | length = sblock_to_check->page_count * PAGE_SIZE; |
7a9e9987 SB |
800 | logical = sblock_to_check->pagev[0]->logical; |
801 | generation = sblock_to_check->pagev[0]->generation; | |
802 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); | |
803 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; | |
804 | is_metadata = !(sblock_to_check->pagev[0]->flags & | |
b5d67f64 | 805 | BTRFS_EXTENT_FLAG_DATA); |
7a9e9987 SB |
806 | have_csum = sblock_to_check->pagev[0]->have_csum; |
807 | csum = sblock_to_check->pagev[0]->csum; | |
808 | dev = sblock_to_check->pagev[0]->dev; | |
13db62b7 | 809 | |
ff023aac SB |
810 | if (sctx->is_dev_replace && !is_metadata && !have_csum) { |
811 | sblocks_for_recheck = NULL; | |
812 | goto nodatasum_case; | |
813 | } | |
814 | ||
b5d67f64 SB |
815 | /* |
816 | * read all mirrors one after the other. This includes to | |
817 | * re-read the extent or metadata block that failed (that was | |
818 | * the cause that this fixup code is called) another time, | |
819 | * page by page this time in order to know which pages | |
820 | * caused I/O errors and which ones are good (for all mirrors). | |
821 | * It is the goal to handle the situation when more than one | |
822 | * mirror contains I/O errors, but the errors do not | |
823 | * overlap, i.e. the data can be repaired by selecting the | |
824 | * pages from those mirrors without I/O error on the | |
825 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) | |
826 | * would be that mirror #1 has an I/O error on the first page, | |
827 | * the second page is good, and mirror #2 has an I/O error on | |
828 | * the second page, but the first page is good. | |
829 | * Then the first page of the first mirror can be repaired by | |
830 | * taking the first page of the second mirror, and the | |
831 | * second page of the second mirror can be repaired by | |
832 | * copying the contents of the 2nd page of the 1st mirror. | |
833 | * One more note: if the pages of one mirror contain I/O | |
834 | * errors, the checksum cannot be verified. In order to get | |
835 | * the best data for repairing, the first attempt is to find | |
836 | * a mirror without I/O errors and with a validated checksum. | |
837 | * Only if this is not possible, the pages are picked from | |
838 | * mirrors with I/O errors without considering the checksum. | |
839 | * If the latter is the case, at the end, the checksum of the | |
840 | * repaired area is verified in order to correctly maintain | |
841 | * the statistics. | |
842 | */ | |
843 | ||
844 | sblocks_for_recheck = kzalloc(BTRFS_MAX_MIRRORS * | |
845 | sizeof(*sblocks_for_recheck), | |
846 | GFP_NOFS); | |
847 | if (!sblocks_for_recheck) { | |
d9d181c1 SB |
848 | spin_lock(&sctx->stat_lock); |
849 | sctx->stat.malloc_errors++; | |
850 | sctx->stat.read_errors++; | |
851 | sctx->stat.uncorrectable_errors++; | |
852 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 853 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 854 | goto out; |
a2de733c AJ |
855 | } |
856 | ||
b5d67f64 | 857 | /* setup the context, map the logical blocks and alloc the pages */ |
ff023aac | 858 | ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length, |
b5d67f64 SB |
859 | logical, sblocks_for_recheck); |
860 | if (ret) { | |
d9d181c1 SB |
861 | spin_lock(&sctx->stat_lock); |
862 | sctx->stat.read_errors++; | |
863 | sctx->stat.uncorrectable_errors++; | |
864 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 865 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 SB |
866 | goto out; |
867 | } | |
868 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); | |
869 | sblock_bad = sblocks_for_recheck + failed_mirror_index; | |
13db62b7 | 870 | |
b5d67f64 | 871 | /* build and submit the bios for the failed mirror, check checksums */ |
34f5c8e9 SB |
872 | scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum, |
873 | csum, generation, sctx->csum_size); | |
a2de733c | 874 | |
b5d67f64 SB |
875 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
876 | sblock_bad->no_io_error_seen) { | |
877 | /* | |
878 | * the error disappeared after reading page by page, or | |
879 | * the area was part of a huge bio and other parts of the | |
880 | * bio caused I/O errors, or the block layer merged several | |
881 | * read requests into one and the error is caused by a | |
882 | * different bio (usually one of the two latter cases is | |
883 | * the cause) | |
884 | */ | |
d9d181c1 SB |
885 | spin_lock(&sctx->stat_lock); |
886 | sctx->stat.unverified_errors++; | |
887 | spin_unlock(&sctx->stat_lock); | |
a2de733c | 888 | |
ff023aac SB |
889 | if (sctx->is_dev_replace) |
890 | scrub_write_block_to_dev_replace(sblock_bad); | |
b5d67f64 | 891 | goto out; |
a2de733c | 892 | } |
a2de733c | 893 | |
b5d67f64 | 894 | if (!sblock_bad->no_io_error_seen) { |
d9d181c1 SB |
895 | spin_lock(&sctx->stat_lock); |
896 | sctx->stat.read_errors++; | |
897 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
898 | if (__ratelimit(&_rs)) |
899 | scrub_print_warning("i/o error", sblock_to_check); | |
a36cf8b8 | 900 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 901 | } else if (sblock_bad->checksum_error) { |
d9d181c1 SB |
902 | spin_lock(&sctx->stat_lock); |
903 | sctx->stat.csum_errors++; | |
904 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
905 | if (__ratelimit(&_rs)) |
906 | scrub_print_warning("checksum error", sblock_to_check); | |
a36cf8b8 | 907 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 908 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 909 | } else if (sblock_bad->header_error) { |
d9d181c1 SB |
910 | spin_lock(&sctx->stat_lock); |
911 | sctx->stat.verify_errors++; | |
912 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
913 | if (__ratelimit(&_rs)) |
914 | scrub_print_warning("checksum/header error", | |
915 | sblock_to_check); | |
442a4f63 | 916 | if (sblock_bad->generation_error) |
a36cf8b8 | 917 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 SB |
918 | BTRFS_DEV_STAT_GENERATION_ERRS); |
919 | else | |
a36cf8b8 | 920 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 921 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 922 | } |
a2de733c | 923 | |
ff023aac | 924 | if (sctx->readonly && !sctx->is_dev_replace) |
b5d67f64 | 925 | goto did_not_correct_error; |
a2de733c | 926 | |
b5d67f64 SB |
927 | if (!is_metadata && !have_csum) { |
928 | struct scrub_fixup_nodatasum *fixup_nodatasum; | |
a2de733c | 929 | |
ff023aac SB |
930 | nodatasum_case: |
931 | WARN_ON(sctx->is_dev_replace); | |
932 | ||
b5d67f64 SB |
933 | /* |
934 | * !is_metadata and !have_csum, this means that the data | |
935 | * might not be COW'ed, that it might be modified | |
936 | * concurrently. The general strategy to work on the | |
937 | * commit root does not help in the case when COW is not | |
938 | * used. | |
939 | */ | |
940 | fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS); | |
941 | if (!fixup_nodatasum) | |
942 | goto did_not_correct_error; | |
d9d181c1 | 943 | fixup_nodatasum->sctx = sctx; |
a36cf8b8 | 944 | fixup_nodatasum->dev = dev; |
b5d67f64 SB |
945 | fixup_nodatasum->logical = logical; |
946 | fixup_nodatasum->root = fs_info->extent_root; | |
947 | fixup_nodatasum->mirror_num = failed_mirror_index + 1; | |
b6bfebc1 | 948 | scrub_pending_trans_workers_inc(sctx); |
b5d67f64 SB |
949 | fixup_nodatasum->work.func = scrub_fixup_nodatasum; |
950 | btrfs_queue_worker(&fs_info->scrub_workers, | |
951 | &fixup_nodatasum->work); | |
952 | goto out; | |
a2de733c AJ |
953 | } |
954 | ||
b5d67f64 SB |
955 | /* |
956 | * now build and submit the bios for the other mirrors, check | |
cb2ced73 SB |
957 | * checksums. |
958 | * First try to pick the mirror which is completely without I/O | |
b5d67f64 SB |
959 | * errors and also does not have a checksum error. |
960 | * If one is found, and if a checksum is present, the full block | |
961 | * that is known to contain an error is rewritten. Afterwards | |
962 | * the block is known to be corrected. | |
963 | * If a mirror is found which is completely correct, and no | |
964 | * checksum is present, only those pages are rewritten that had | |
965 | * an I/O error in the block to be repaired, since it cannot be | |
966 | * determined, which copy of the other pages is better (and it | |
967 | * could happen otherwise that a correct page would be | |
968 | * overwritten by a bad one). | |
969 | */ | |
970 | for (mirror_index = 0; | |
971 | mirror_index < BTRFS_MAX_MIRRORS && | |
972 | sblocks_for_recheck[mirror_index].page_count > 0; | |
973 | mirror_index++) { | |
cb2ced73 | 974 | struct scrub_block *sblock_other; |
b5d67f64 | 975 | |
cb2ced73 SB |
976 | if (mirror_index == failed_mirror_index) |
977 | continue; | |
978 | sblock_other = sblocks_for_recheck + mirror_index; | |
979 | ||
980 | /* build and submit the bios, check checksums */ | |
34f5c8e9 SB |
981 | scrub_recheck_block(fs_info, sblock_other, is_metadata, |
982 | have_csum, csum, generation, | |
983 | sctx->csum_size); | |
984 | ||
985 | if (!sblock_other->header_error && | |
b5d67f64 SB |
986 | !sblock_other->checksum_error && |
987 | sblock_other->no_io_error_seen) { | |
ff023aac SB |
988 | if (sctx->is_dev_replace) { |
989 | scrub_write_block_to_dev_replace(sblock_other); | |
990 | } else { | |
991 | int force_write = is_metadata || have_csum; | |
992 | ||
993 | ret = scrub_repair_block_from_good_copy( | |
994 | sblock_bad, sblock_other, | |
995 | force_write); | |
996 | } | |
b5d67f64 SB |
997 | if (0 == ret) |
998 | goto corrected_error; | |
999 | } | |
1000 | } | |
a2de733c AJ |
1001 | |
1002 | /* | |
ff023aac SB |
1003 | * for dev_replace, pick good pages and write to the target device. |
1004 | */ | |
1005 | if (sctx->is_dev_replace) { | |
1006 | success = 1; | |
1007 | for (page_num = 0; page_num < sblock_bad->page_count; | |
1008 | page_num++) { | |
1009 | int sub_success; | |
1010 | ||
1011 | sub_success = 0; | |
1012 | for (mirror_index = 0; | |
1013 | mirror_index < BTRFS_MAX_MIRRORS && | |
1014 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1015 | mirror_index++) { | |
1016 | struct scrub_block *sblock_other = | |
1017 | sblocks_for_recheck + mirror_index; | |
1018 | struct scrub_page *page_other = | |
1019 | sblock_other->pagev[page_num]; | |
1020 | ||
1021 | if (!page_other->io_error) { | |
1022 | ret = scrub_write_page_to_dev_replace( | |
1023 | sblock_other, page_num); | |
1024 | if (ret == 0) { | |
1025 | /* succeeded for this page */ | |
1026 | sub_success = 1; | |
1027 | break; | |
1028 | } else { | |
1029 | btrfs_dev_replace_stats_inc( | |
1030 | &sctx->dev_root-> | |
1031 | fs_info->dev_replace. | |
1032 | num_write_errors); | |
1033 | } | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | if (!sub_success) { | |
1038 | /* | |
1039 | * did not find a mirror to fetch the page | |
1040 | * from. scrub_write_page_to_dev_replace() | |
1041 | * handles this case (page->io_error), by | |
1042 | * filling the block with zeros before | |
1043 | * submitting the write request | |
1044 | */ | |
1045 | success = 0; | |
1046 | ret = scrub_write_page_to_dev_replace( | |
1047 | sblock_bad, page_num); | |
1048 | if (ret) | |
1049 | btrfs_dev_replace_stats_inc( | |
1050 | &sctx->dev_root->fs_info-> | |
1051 | dev_replace.num_write_errors); | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | goto out; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * for regular scrub, repair those pages that are errored. | |
1060 | * In case of I/O errors in the area that is supposed to be | |
b5d67f64 SB |
1061 | * repaired, continue by picking good copies of those pages. |
1062 | * Select the good pages from mirrors to rewrite bad pages from | |
1063 | * the area to fix. Afterwards verify the checksum of the block | |
1064 | * that is supposed to be repaired. This verification step is | |
1065 | * only done for the purpose of statistic counting and for the | |
1066 | * final scrub report, whether errors remain. | |
1067 | * A perfect algorithm could make use of the checksum and try | |
1068 | * all possible combinations of pages from the different mirrors | |
1069 | * until the checksum verification succeeds. For example, when | |
1070 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page | |
1071 | * of mirror #2 is readable but the final checksum test fails, | |
1072 | * then the 2nd page of mirror #3 could be tried, whether now | |
1073 | * the final checksum succeedes. But this would be a rare | |
1074 | * exception and is therefore not implemented. At least it is | |
1075 | * avoided that the good copy is overwritten. | |
1076 | * A more useful improvement would be to pick the sectors | |
1077 | * without I/O error based on sector sizes (512 bytes on legacy | |
1078 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one | |
1079 | * mirror could be repaired by taking 512 byte of a different | |
1080 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE | |
1081 | * area are unreadable. | |
a2de733c | 1082 | */ |
a2de733c | 1083 | |
b5d67f64 SB |
1084 | /* can only fix I/O errors from here on */ |
1085 | if (sblock_bad->no_io_error_seen) | |
1086 | goto did_not_correct_error; | |
1087 | ||
1088 | success = 1; | |
1089 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { | |
7a9e9987 | 1090 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
b5d67f64 SB |
1091 | |
1092 | if (!page_bad->io_error) | |
a2de733c | 1093 | continue; |
b5d67f64 SB |
1094 | |
1095 | for (mirror_index = 0; | |
1096 | mirror_index < BTRFS_MAX_MIRRORS && | |
1097 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1098 | mirror_index++) { | |
1099 | struct scrub_block *sblock_other = sblocks_for_recheck + | |
1100 | mirror_index; | |
7a9e9987 SB |
1101 | struct scrub_page *page_other = sblock_other->pagev[ |
1102 | page_num]; | |
b5d67f64 SB |
1103 | |
1104 | if (!page_other->io_error) { | |
1105 | ret = scrub_repair_page_from_good_copy( | |
1106 | sblock_bad, sblock_other, page_num, 0); | |
1107 | if (0 == ret) { | |
1108 | page_bad->io_error = 0; | |
1109 | break; /* succeeded for this page */ | |
1110 | } | |
1111 | } | |
96e36920 | 1112 | } |
a2de733c | 1113 | |
b5d67f64 SB |
1114 | if (page_bad->io_error) { |
1115 | /* did not find a mirror to copy the page from */ | |
1116 | success = 0; | |
1117 | } | |
a2de733c | 1118 | } |
a2de733c | 1119 | |
b5d67f64 SB |
1120 | if (success) { |
1121 | if (is_metadata || have_csum) { | |
1122 | /* | |
1123 | * need to verify the checksum now that all | |
1124 | * sectors on disk are repaired (the write | |
1125 | * request for data to be repaired is on its way). | |
1126 | * Just be lazy and use scrub_recheck_block() | |
1127 | * which re-reads the data before the checksum | |
1128 | * is verified, but most likely the data comes out | |
1129 | * of the page cache. | |
1130 | */ | |
34f5c8e9 SB |
1131 | scrub_recheck_block(fs_info, sblock_bad, |
1132 | is_metadata, have_csum, csum, | |
1133 | generation, sctx->csum_size); | |
1134 | if (!sblock_bad->header_error && | |
b5d67f64 SB |
1135 | !sblock_bad->checksum_error && |
1136 | sblock_bad->no_io_error_seen) | |
1137 | goto corrected_error; | |
1138 | else | |
1139 | goto did_not_correct_error; | |
1140 | } else { | |
1141 | corrected_error: | |
d9d181c1 SB |
1142 | spin_lock(&sctx->stat_lock); |
1143 | sctx->stat.corrected_errors++; | |
1144 | spin_unlock(&sctx->stat_lock); | |
606686ee | 1145 | printk_ratelimited_in_rcu(KERN_ERR |
b5d67f64 | 1146 | "btrfs: fixed up error at logical %llu on dev %s\n", |
606686ee | 1147 | (unsigned long long)logical, |
a36cf8b8 | 1148 | rcu_str_deref(dev->name)); |
8628764e | 1149 | } |
b5d67f64 SB |
1150 | } else { |
1151 | did_not_correct_error: | |
d9d181c1 SB |
1152 | spin_lock(&sctx->stat_lock); |
1153 | sctx->stat.uncorrectable_errors++; | |
1154 | spin_unlock(&sctx->stat_lock); | |
606686ee | 1155 | printk_ratelimited_in_rcu(KERN_ERR |
b5d67f64 | 1156 | "btrfs: unable to fixup (regular) error at logical %llu on dev %s\n", |
606686ee | 1157 | (unsigned long long)logical, |
a36cf8b8 | 1158 | rcu_str_deref(dev->name)); |
96e36920 | 1159 | } |
a2de733c | 1160 | |
b5d67f64 SB |
1161 | out: |
1162 | if (sblocks_for_recheck) { | |
1163 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; | |
1164 | mirror_index++) { | |
1165 | struct scrub_block *sblock = sblocks_for_recheck + | |
1166 | mirror_index; | |
1167 | int page_index; | |
1168 | ||
7a9e9987 SB |
1169 | for (page_index = 0; page_index < sblock->page_count; |
1170 | page_index++) { | |
1171 | sblock->pagev[page_index]->sblock = NULL; | |
1172 | scrub_page_put(sblock->pagev[page_index]); | |
1173 | } | |
b5d67f64 SB |
1174 | } |
1175 | kfree(sblocks_for_recheck); | |
1176 | } | |
a2de733c | 1177 | |
b5d67f64 SB |
1178 | return 0; |
1179 | } | |
a2de733c | 1180 | |
d9d181c1 | 1181 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
3ec706c8 | 1182 | struct btrfs_fs_info *fs_info, |
ff023aac | 1183 | struct scrub_block *original_sblock, |
b5d67f64 SB |
1184 | u64 length, u64 logical, |
1185 | struct scrub_block *sblocks_for_recheck) | |
1186 | { | |
1187 | int page_index; | |
1188 | int mirror_index; | |
1189 | int ret; | |
1190 | ||
1191 | /* | |
7a9e9987 | 1192 | * note: the two members ref_count and outstanding_pages |
b5d67f64 SB |
1193 | * are not used (and not set) in the blocks that are used for |
1194 | * the recheck procedure | |
1195 | */ | |
1196 | ||
1197 | page_index = 0; | |
1198 | while (length > 0) { | |
1199 | u64 sublen = min_t(u64, length, PAGE_SIZE); | |
1200 | u64 mapped_length = sublen; | |
1201 | struct btrfs_bio *bbio = NULL; | |
a2de733c | 1202 | |
b5d67f64 SB |
1203 | /* |
1204 | * with a length of PAGE_SIZE, each returned stripe | |
1205 | * represents one mirror | |
1206 | */ | |
29a8d9a0 SB |
1207 | ret = btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS, logical, |
1208 | &mapped_length, &bbio, 0); | |
b5d67f64 SB |
1209 | if (ret || !bbio || mapped_length < sublen) { |
1210 | kfree(bbio); | |
1211 | return -EIO; | |
1212 | } | |
a2de733c | 1213 | |
ff023aac | 1214 | BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
1215 | for (mirror_index = 0; mirror_index < (int)bbio->num_stripes; |
1216 | mirror_index++) { | |
1217 | struct scrub_block *sblock; | |
1218 | struct scrub_page *page; | |
1219 | ||
1220 | if (mirror_index >= BTRFS_MAX_MIRRORS) | |
1221 | continue; | |
1222 | ||
1223 | sblock = sblocks_for_recheck + mirror_index; | |
7a9e9987 SB |
1224 | sblock->sctx = sctx; |
1225 | page = kzalloc(sizeof(*page), GFP_NOFS); | |
1226 | if (!page) { | |
1227 | leave_nomem: | |
d9d181c1 SB |
1228 | spin_lock(&sctx->stat_lock); |
1229 | sctx->stat.malloc_errors++; | |
1230 | spin_unlock(&sctx->stat_lock); | |
cf93dcce | 1231 | kfree(bbio); |
b5d67f64 SB |
1232 | return -ENOMEM; |
1233 | } | |
7a9e9987 SB |
1234 | scrub_page_get(page); |
1235 | sblock->pagev[page_index] = page; | |
1236 | page->logical = logical; | |
1237 | page->physical = bbio->stripes[mirror_index].physical; | |
ff023aac SB |
1238 | BUG_ON(page_index >= original_sblock->page_count); |
1239 | page->physical_for_dev_replace = | |
1240 | original_sblock->pagev[page_index]-> | |
1241 | physical_for_dev_replace; | |
7a9e9987 SB |
1242 | /* for missing devices, dev->bdev is NULL */ |
1243 | page->dev = bbio->stripes[mirror_index].dev; | |
1244 | page->mirror_num = mirror_index + 1; | |
b5d67f64 | 1245 | sblock->page_count++; |
7a9e9987 SB |
1246 | page->page = alloc_page(GFP_NOFS); |
1247 | if (!page->page) | |
1248 | goto leave_nomem; | |
b5d67f64 SB |
1249 | } |
1250 | kfree(bbio); | |
1251 | length -= sublen; | |
1252 | logical += sublen; | |
1253 | page_index++; | |
1254 | } | |
1255 | ||
1256 | return 0; | |
96e36920 ID |
1257 | } |
1258 | ||
b5d67f64 SB |
1259 | /* |
1260 | * this function will check the on disk data for checksum errors, header | |
1261 | * errors and read I/O errors. If any I/O errors happen, the exact pages | |
1262 | * which are errored are marked as being bad. The goal is to enable scrub | |
1263 | * to take those pages that are not errored from all the mirrors so that | |
1264 | * the pages that are errored in the just handled mirror can be repaired. | |
1265 | */ | |
34f5c8e9 SB |
1266 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
1267 | struct scrub_block *sblock, int is_metadata, | |
1268 | int have_csum, u8 *csum, u64 generation, | |
1269 | u16 csum_size) | |
96e36920 | 1270 | { |
b5d67f64 | 1271 | int page_num; |
96e36920 | 1272 | |
b5d67f64 SB |
1273 | sblock->no_io_error_seen = 1; |
1274 | sblock->header_error = 0; | |
1275 | sblock->checksum_error = 0; | |
96e36920 | 1276 | |
b5d67f64 SB |
1277 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1278 | struct bio *bio; | |
7a9e9987 | 1279 | struct scrub_page *page = sblock->pagev[page_num]; |
b5d67f64 SB |
1280 | DECLARE_COMPLETION_ONSTACK(complete); |
1281 | ||
442a4f63 | 1282 | if (page->dev->bdev == NULL) { |
ea9947b4 SB |
1283 | page->io_error = 1; |
1284 | sblock->no_io_error_seen = 0; | |
1285 | continue; | |
1286 | } | |
1287 | ||
7a9e9987 | 1288 | WARN_ON(!page->page); |
b5d67f64 | 1289 | bio = bio_alloc(GFP_NOFS, 1); |
34f5c8e9 SB |
1290 | if (!bio) { |
1291 | page->io_error = 1; | |
1292 | sblock->no_io_error_seen = 0; | |
1293 | continue; | |
1294 | } | |
442a4f63 | 1295 | bio->bi_bdev = page->dev->bdev; |
b5d67f64 SB |
1296 | bio->bi_sector = page->physical >> 9; |
1297 | bio->bi_end_io = scrub_complete_bio_end_io; | |
1298 | bio->bi_private = &complete; | |
1299 | ||
34f5c8e9 | 1300 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
b5d67f64 | 1301 | btrfsic_submit_bio(READ, bio); |
96e36920 | 1302 | |
b5d67f64 SB |
1303 | /* this will also unplug the queue */ |
1304 | wait_for_completion(&complete); | |
96e36920 | 1305 | |
b5d67f64 SB |
1306 | page->io_error = !test_bit(BIO_UPTODATE, &bio->bi_flags); |
1307 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
1308 | sblock->no_io_error_seen = 0; | |
1309 | bio_put(bio); | |
1310 | } | |
96e36920 | 1311 | |
b5d67f64 SB |
1312 | if (sblock->no_io_error_seen) |
1313 | scrub_recheck_block_checksum(fs_info, sblock, is_metadata, | |
1314 | have_csum, csum, generation, | |
1315 | csum_size); | |
1316 | ||
34f5c8e9 | 1317 | return; |
a2de733c AJ |
1318 | } |
1319 | ||
b5d67f64 SB |
1320 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
1321 | struct scrub_block *sblock, | |
1322 | int is_metadata, int have_csum, | |
1323 | const u8 *csum, u64 generation, | |
1324 | u16 csum_size) | |
a2de733c | 1325 | { |
b5d67f64 SB |
1326 | int page_num; |
1327 | u8 calculated_csum[BTRFS_CSUM_SIZE]; | |
1328 | u32 crc = ~(u32)0; | |
1329 | struct btrfs_root *root = fs_info->extent_root; | |
1330 | void *mapped_buffer; | |
1331 | ||
7a9e9987 | 1332 | WARN_ON(!sblock->pagev[0]->page); |
b5d67f64 SB |
1333 | if (is_metadata) { |
1334 | struct btrfs_header *h; | |
1335 | ||
7a9e9987 | 1336 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 SB |
1337 | h = (struct btrfs_header *)mapped_buffer; |
1338 | ||
7a9e9987 | 1339 | if (sblock->pagev[0]->logical != le64_to_cpu(h->bytenr) || |
b5d67f64 SB |
1340 | memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE) || |
1341 | memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
442a4f63 | 1342 | BTRFS_UUID_SIZE)) { |
b5d67f64 | 1343 | sblock->header_error = 1; |
442a4f63 SB |
1344 | } else if (generation != le64_to_cpu(h->generation)) { |
1345 | sblock->header_error = 1; | |
1346 | sblock->generation_error = 1; | |
1347 | } | |
b5d67f64 SB |
1348 | csum = h->csum; |
1349 | } else { | |
1350 | if (!have_csum) | |
1351 | return; | |
a2de733c | 1352 | |
7a9e9987 | 1353 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 | 1354 | } |
a2de733c | 1355 | |
b5d67f64 SB |
1356 | for (page_num = 0;;) { |
1357 | if (page_num == 0 && is_metadata) | |
1358 | crc = btrfs_csum_data(root, | |
1359 | ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE, | |
1360 | crc, PAGE_SIZE - BTRFS_CSUM_SIZE); | |
1361 | else | |
1362 | crc = btrfs_csum_data(root, mapped_buffer, crc, | |
1363 | PAGE_SIZE); | |
1364 | ||
9613bebb | 1365 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1366 | page_num++; |
1367 | if (page_num >= sblock->page_count) | |
1368 | break; | |
7a9e9987 | 1369 | WARN_ON(!sblock->pagev[page_num]->page); |
b5d67f64 | 1370 | |
7a9e9987 | 1371 | mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page); |
b5d67f64 SB |
1372 | } |
1373 | ||
1374 | btrfs_csum_final(crc, calculated_csum); | |
1375 | if (memcmp(calculated_csum, csum, csum_size)) | |
1376 | sblock->checksum_error = 1; | |
a2de733c AJ |
1377 | } |
1378 | ||
b5d67f64 | 1379 | static void scrub_complete_bio_end_io(struct bio *bio, int err) |
a2de733c | 1380 | { |
b5d67f64 SB |
1381 | complete((struct completion *)bio->bi_private); |
1382 | } | |
a2de733c | 1383 | |
b5d67f64 SB |
1384 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
1385 | struct scrub_block *sblock_good, | |
1386 | int force_write) | |
1387 | { | |
1388 | int page_num; | |
1389 | int ret = 0; | |
96e36920 | 1390 | |
b5d67f64 SB |
1391 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
1392 | int ret_sub; | |
96e36920 | 1393 | |
b5d67f64 SB |
1394 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
1395 | sblock_good, | |
1396 | page_num, | |
1397 | force_write); | |
1398 | if (ret_sub) | |
1399 | ret = ret_sub; | |
a2de733c | 1400 | } |
b5d67f64 SB |
1401 | |
1402 | return ret; | |
1403 | } | |
1404 | ||
1405 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
1406 | struct scrub_block *sblock_good, | |
1407 | int page_num, int force_write) | |
1408 | { | |
7a9e9987 SB |
1409 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
1410 | struct scrub_page *page_good = sblock_good->pagev[page_num]; | |
b5d67f64 | 1411 | |
7a9e9987 SB |
1412 | BUG_ON(page_bad->page == NULL); |
1413 | BUG_ON(page_good->page == NULL); | |
b5d67f64 SB |
1414 | if (force_write || sblock_bad->header_error || |
1415 | sblock_bad->checksum_error || page_bad->io_error) { | |
1416 | struct bio *bio; | |
1417 | int ret; | |
1418 | DECLARE_COMPLETION_ONSTACK(complete); | |
1419 | ||
ff023aac SB |
1420 | if (!page_bad->dev->bdev) { |
1421 | printk_ratelimited(KERN_WARNING | |
1422 | "btrfs: scrub_repair_page_from_good_copy(bdev == NULL) is unexpected!\n"); | |
1423 | return -EIO; | |
1424 | } | |
1425 | ||
b5d67f64 | 1426 | bio = bio_alloc(GFP_NOFS, 1); |
e627ee7b TI |
1427 | if (!bio) |
1428 | return -EIO; | |
442a4f63 | 1429 | bio->bi_bdev = page_bad->dev->bdev; |
b5d67f64 SB |
1430 | bio->bi_sector = page_bad->physical >> 9; |
1431 | bio->bi_end_io = scrub_complete_bio_end_io; | |
1432 | bio->bi_private = &complete; | |
1433 | ||
1434 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); | |
1435 | if (PAGE_SIZE != ret) { | |
1436 | bio_put(bio); | |
1437 | return -EIO; | |
13db62b7 | 1438 | } |
b5d67f64 SB |
1439 | btrfsic_submit_bio(WRITE, bio); |
1440 | ||
1441 | /* this will also unplug the queue */ | |
1442 | wait_for_completion(&complete); | |
442a4f63 SB |
1443 | if (!bio_flagged(bio, BIO_UPTODATE)) { |
1444 | btrfs_dev_stat_inc_and_print(page_bad->dev, | |
1445 | BTRFS_DEV_STAT_WRITE_ERRS); | |
ff023aac SB |
1446 | btrfs_dev_replace_stats_inc( |
1447 | &sblock_bad->sctx->dev_root->fs_info-> | |
1448 | dev_replace.num_write_errors); | |
442a4f63 SB |
1449 | bio_put(bio); |
1450 | return -EIO; | |
1451 | } | |
b5d67f64 | 1452 | bio_put(bio); |
a2de733c AJ |
1453 | } |
1454 | ||
b5d67f64 SB |
1455 | return 0; |
1456 | } | |
1457 | ||
ff023aac SB |
1458 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
1459 | { | |
1460 | int page_num; | |
1461 | ||
1462 | for (page_num = 0; page_num < sblock->page_count; page_num++) { | |
1463 | int ret; | |
1464 | ||
1465 | ret = scrub_write_page_to_dev_replace(sblock, page_num); | |
1466 | if (ret) | |
1467 | btrfs_dev_replace_stats_inc( | |
1468 | &sblock->sctx->dev_root->fs_info->dev_replace. | |
1469 | num_write_errors); | |
1470 | } | |
1471 | } | |
1472 | ||
1473 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
1474 | int page_num) | |
1475 | { | |
1476 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1477 | ||
1478 | BUG_ON(spage->page == NULL); | |
1479 | if (spage->io_error) { | |
1480 | void *mapped_buffer = kmap_atomic(spage->page); | |
1481 | ||
1482 | memset(mapped_buffer, 0, PAGE_CACHE_SIZE); | |
1483 | flush_dcache_page(spage->page); | |
1484 | kunmap_atomic(mapped_buffer); | |
1485 | } | |
1486 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); | |
1487 | } | |
1488 | ||
1489 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
1490 | struct scrub_page *spage) | |
1491 | { | |
1492 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1493 | struct scrub_bio *sbio; | |
1494 | int ret; | |
1495 | ||
1496 | mutex_lock(&wr_ctx->wr_lock); | |
1497 | again: | |
1498 | if (!wr_ctx->wr_curr_bio) { | |
1499 | wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio), | |
1500 | GFP_NOFS); | |
1501 | if (!wr_ctx->wr_curr_bio) { | |
1502 | mutex_unlock(&wr_ctx->wr_lock); | |
1503 | return -ENOMEM; | |
1504 | } | |
1505 | wr_ctx->wr_curr_bio->sctx = sctx; | |
1506 | wr_ctx->wr_curr_bio->page_count = 0; | |
1507 | } | |
1508 | sbio = wr_ctx->wr_curr_bio; | |
1509 | if (sbio->page_count == 0) { | |
1510 | struct bio *bio; | |
1511 | ||
1512 | sbio->physical = spage->physical_for_dev_replace; | |
1513 | sbio->logical = spage->logical; | |
1514 | sbio->dev = wr_ctx->tgtdev; | |
1515 | bio = sbio->bio; | |
1516 | if (!bio) { | |
1517 | bio = bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio); | |
1518 | if (!bio) { | |
1519 | mutex_unlock(&wr_ctx->wr_lock); | |
1520 | return -ENOMEM; | |
1521 | } | |
1522 | sbio->bio = bio; | |
1523 | } | |
1524 | ||
1525 | bio->bi_private = sbio; | |
1526 | bio->bi_end_io = scrub_wr_bio_end_io; | |
1527 | bio->bi_bdev = sbio->dev->bdev; | |
1528 | bio->bi_sector = sbio->physical >> 9; | |
1529 | sbio->err = 0; | |
1530 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != | |
1531 | spage->physical_for_dev_replace || | |
1532 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
1533 | spage->logical) { | |
1534 | scrub_wr_submit(sctx); | |
1535 | goto again; | |
1536 | } | |
1537 | ||
1538 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1539 | if (ret != PAGE_SIZE) { | |
1540 | if (sbio->page_count < 1) { | |
1541 | bio_put(sbio->bio); | |
1542 | sbio->bio = NULL; | |
1543 | mutex_unlock(&wr_ctx->wr_lock); | |
1544 | return -EIO; | |
1545 | } | |
1546 | scrub_wr_submit(sctx); | |
1547 | goto again; | |
1548 | } | |
1549 | ||
1550 | sbio->pagev[sbio->page_count] = spage; | |
1551 | scrub_page_get(spage); | |
1552 | sbio->page_count++; | |
1553 | if (sbio->page_count == wr_ctx->pages_per_wr_bio) | |
1554 | scrub_wr_submit(sctx); | |
1555 | mutex_unlock(&wr_ctx->wr_lock); | |
1556 | ||
1557 | return 0; | |
1558 | } | |
1559 | ||
1560 | static void scrub_wr_submit(struct scrub_ctx *sctx) | |
1561 | { | |
1562 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1563 | struct scrub_bio *sbio; | |
1564 | ||
1565 | if (!wr_ctx->wr_curr_bio) | |
1566 | return; | |
1567 | ||
1568 | sbio = wr_ctx->wr_curr_bio; | |
1569 | wr_ctx->wr_curr_bio = NULL; | |
1570 | WARN_ON(!sbio->bio->bi_bdev); | |
1571 | scrub_pending_bio_inc(sctx); | |
1572 | /* process all writes in a single worker thread. Then the block layer | |
1573 | * orders the requests before sending them to the driver which | |
1574 | * doubled the write performance on spinning disks when measured | |
1575 | * with Linux 3.5 */ | |
1576 | btrfsic_submit_bio(WRITE, sbio->bio); | |
1577 | } | |
1578 | ||
1579 | static void scrub_wr_bio_end_io(struct bio *bio, int err) | |
1580 | { | |
1581 | struct scrub_bio *sbio = bio->bi_private; | |
1582 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; | |
1583 | ||
1584 | sbio->err = err; | |
1585 | sbio->bio = bio; | |
1586 | ||
1587 | sbio->work.func = scrub_wr_bio_end_io_worker; | |
1588 | btrfs_queue_worker(&fs_info->scrub_wr_completion_workers, &sbio->work); | |
1589 | } | |
1590 | ||
1591 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) | |
1592 | { | |
1593 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
1594 | struct scrub_ctx *sctx = sbio->sctx; | |
1595 | int i; | |
1596 | ||
1597 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); | |
1598 | if (sbio->err) { | |
1599 | struct btrfs_dev_replace *dev_replace = | |
1600 | &sbio->sctx->dev_root->fs_info->dev_replace; | |
1601 | ||
1602 | for (i = 0; i < sbio->page_count; i++) { | |
1603 | struct scrub_page *spage = sbio->pagev[i]; | |
1604 | ||
1605 | spage->io_error = 1; | |
1606 | btrfs_dev_replace_stats_inc(&dev_replace-> | |
1607 | num_write_errors); | |
1608 | } | |
1609 | } | |
1610 | ||
1611 | for (i = 0; i < sbio->page_count; i++) | |
1612 | scrub_page_put(sbio->pagev[i]); | |
1613 | ||
1614 | bio_put(sbio->bio); | |
1615 | kfree(sbio); | |
1616 | scrub_pending_bio_dec(sctx); | |
1617 | } | |
1618 | ||
1619 | static int scrub_checksum(struct scrub_block *sblock) | |
b5d67f64 SB |
1620 | { |
1621 | u64 flags; | |
1622 | int ret; | |
1623 | ||
7a9e9987 SB |
1624 | WARN_ON(sblock->page_count < 1); |
1625 | flags = sblock->pagev[0]->flags; | |
b5d67f64 SB |
1626 | ret = 0; |
1627 | if (flags & BTRFS_EXTENT_FLAG_DATA) | |
1628 | ret = scrub_checksum_data(sblock); | |
1629 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) | |
1630 | ret = scrub_checksum_tree_block(sblock); | |
1631 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
1632 | (void)scrub_checksum_super(sblock); | |
1633 | else | |
1634 | WARN_ON(1); | |
1635 | if (ret) | |
1636 | scrub_handle_errored_block(sblock); | |
ff023aac SB |
1637 | |
1638 | return ret; | |
a2de733c AJ |
1639 | } |
1640 | ||
b5d67f64 | 1641 | static int scrub_checksum_data(struct scrub_block *sblock) |
a2de733c | 1642 | { |
d9d181c1 | 1643 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1644 | u8 csum[BTRFS_CSUM_SIZE]; |
b5d67f64 SB |
1645 | u8 *on_disk_csum; |
1646 | struct page *page; | |
1647 | void *buffer; | |
a2de733c AJ |
1648 | u32 crc = ~(u32)0; |
1649 | int fail = 0; | |
a36cf8b8 | 1650 | struct btrfs_root *root = sctx->dev_root; |
b5d67f64 SB |
1651 | u64 len; |
1652 | int index; | |
a2de733c | 1653 | |
b5d67f64 | 1654 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1655 | if (!sblock->pagev[0]->have_csum) |
a2de733c AJ |
1656 | return 0; |
1657 | ||
7a9e9987 SB |
1658 | on_disk_csum = sblock->pagev[0]->csum; |
1659 | page = sblock->pagev[0]->page; | |
9613bebb | 1660 | buffer = kmap_atomic(page); |
b5d67f64 | 1661 | |
d9d181c1 | 1662 | len = sctx->sectorsize; |
b5d67f64 SB |
1663 | index = 0; |
1664 | for (;;) { | |
1665 | u64 l = min_t(u64, len, PAGE_SIZE); | |
1666 | ||
1667 | crc = btrfs_csum_data(root, buffer, crc, l); | |
9613bebb | 1668 | kunmap_atomic(buffer); |
b5d67f64 SB |
1669 | len -= l; |
1670 | if (len == 0) | |
1671 | break; | |
1672 | index++; | |
1673 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1674 | BUG_ON(!sblock->pagev[index]->page); |
1675 | page = sblock->pagev[index]->page; | |
9613bebb | 1676 | buffer = kmap_atomic(page); |
b5d67f64 SB |
1677 | } |
1678 | ||
a2de733c | 1679 | btrfs_csum_final(crc, csum); |
d9d181c1 | 1680 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1681 | fail = 1; |
1682 | ||
a2de733c AJ |
1683 | return fail; |
1684 | } | |
1685 | ||
b5d67f64 | 1686 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
a2de733c | 1687 | { |
d9d181c1 | 1688 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1689 | struct btrfs_header *h; |
a36cf8b8 | 1690 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 1691 | struct btrfs_fs_info *fs_info = root->fs_info; |
b5d67f64 SB |
1692 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1693 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1694 | struct page *page; | |
1695 | void *mapped_buffer; | |
1696 | u64 mapped_size; | |
1697 | void *p; | |
a2de733c AJ |
1698 | u32 crc = ~(u32)0; |
1699 | int fail = 0; | |
1700 | int crc_fail = 0; | |
b5d67f64 SB |
1701 | u64 len; |
1702 | int index; | |
1703 | ||
1704 | BUG_ON(sblock->page_count < 1); | |
7a9e9987 | 1705 | page = sblock->pagev[0]->page; |
9613bebb | 1706 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1707 | h = (struct btrfs_header *)mapped_buffer; |
d9d181c1 | 1708 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
a2de733c AJ |
1709 | |
1710 | /* | |
1711 | * we don't use the getter functions here, as we | |
1712 | * a) don't have an extent buffer and | |
1713 | * b) the page is already kmapped | |
1714 | */ | |
a2de733c | 1715 | |
7a9e9987 | 1716 | if (sblock->pagev[0]->logical != le64_to_cpu(h->bytenr)) |
a2de733c AJ |
1717 | ++fail; |
1718 | ||
7a9e9987 | 1719 | if (sblock->pagev[0]->generation != le64_to_cpu(h->generation)) |
a2de733c AJ |
1720 | ++fail; |
1721 | ||
1722 | if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) | |
1723 | ++fail; | |
1724 | ||
1725 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
1726 | BTRFS_UUID_SIZE)) | |
1727 | ++fail; | |
1728 | ||
ff023aac | 1729 | WARN_ON(sctx->nodesize != sctx->leafsize); |
d9d181c1 | 1730 | len = sctx->nodesize - BTRFS_CSUM_SIZE; |
b5d67f64 SB |
1731 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
1732 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1733 | index = 0; | |
1734 | for (;;) { | |
1735 | u64 l = min_t(u64, len, mapped_size); | |
1736 | ||
1737 | crc = btrfs_csum_data(root, p, crc, l); | |
9613bebb | 1738 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1739 | len -= l; |
1740 | if (len == 0) | |
1741 | break; | |
1742 | index++; | |
1743 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1744 | BUG_ON(!sblock->pagev[index]->page); |
1745 | page = sblock->pagev[index]->page; | |
9613bebb | 1746 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1747 | mapped_size = PAGE_SIZE; |
1748 | p = mapped_buffer; | |
1749 | } | |
1750 | ||
1751 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1752 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1753 | ++crc_fail; |
1754 | ||
a2de733c AJ |
1755 | return fail || crc_fail; |
1756 | } | |
1757 | ||
b5d67f64 | 1758 | static int scrub_checksum_super(struct scrub_block *sblock) |
a2de733c AJ |
1759 | { |
1760 | struct btrfs_super_block *s; | |
d9d181c1 | 1761 | struct scrub_ctx *sctx = sblock->sctx; |
a36cf8b8 | 1762 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 1763 | struct btrfs_fs_info *fs_info = root->fs_info; |
b5d67f64 SB |
1764 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1765 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1766 | struct page *page; | |
1767 | void *mapped_buffer; | |
1768 | u64 mapped_size; | |
1769 | void *p; | |
a2de733c | 1770 | u32 crc = ~(u32)0; |
442a4f63 SB |
1771 | int fail_gen = 0; |
1772 | int fail_cor = 0; | |
b5d67f64 SB |
1773 | u64 len; |
1774 | int index; | |
a2de733c | 1775 | |
b5d67f64 | 1776 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1777 | page = sblock->pagev[0]->page; |
9613bebb | 1778 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1779 | s = (struct btrfs_super_block *)mapped_buffer; |
d9d181c1 | 1780 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
a2de733c | 1781 | |
7a9e9987 | 1782 | if (sblock->pagev[0]->logical != le64_to_cpu(s->bytenr)) |
442a4f63 | 1783 | ++fail_cor; |
a2de733c | 1784 | |
7a9e9987 | 1785 | if (sblock->pagev[0]->generation != le64_to_cpu(s->generation)) |
442a4f63 | 1786 | ++fail_gen; |
a2de733c AJ |
1787 | |
1788 | if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) | |
442a4f63 | 1789 | ++fail_cor; |
a2de733c | 1790 | |
b5d67f64 SB |
1791 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
1792 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; | |
1793 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1794 | index = 0; | |
1795 | for (;;) { | |
1796 | u64 l = min_t(u64, len, mapped_size); | |
1797 | ||
1798 | crc = btrfs_csum_data(root, p, crc, l); | |
9613bebb | 1799 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1800 | len -= l; |
1801 | if (len == 0) | |
1802 | break; | |
1803 | index++; | |
1804 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1805 | BUG_ON(!sblock->pagev[index]->page); |
1806 | page = sblock->pagev[index]->page; | |
9613bebb | 1807 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1808 | mapped_size = PAGE_SIZE; |
1809 | p = mapped_buffer; | |
1810 | } | |
1811 | ||
1812 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1813 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
442a4f63 | 1814 | ++fail_cor; |
a2de733c | 1815 | |
442a4f63 | 1816 | if (fail_cor + fail_gen) { |
a2de733c AJ |
1817 | /* |
1818 | * if we find an error in a super block, we just report it. | |
1819 | * They will get written with the next transaction commit | |
1820 | * anyway | |
1821 | */ | |
d9d181c1 SB |
1822 | spin_lock(&sctx->stat_lock); |
1823 | ++sctx->stat.super_errors; | |
1824 | spin_unlock(&sctx->stat_lock); | |
442a4f63 | 1825 | if (fail_cor) |
7a9e9987 | 1826 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 SB |
1827 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
1828 | else | |
7a9e9987 | 1829 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 | 1830 | BTRFS_DEV_STAT_GENERATION_ERRS); |
a2de733c AJ |
1831 | } |
1832 | ||
442a4f63 | 1833 | return fail_cor + fail_gen; |
a2de733c AJ |
1834 | } |
1835 | ||
b5d67f64 SB |
1836 | static void scrub_block_get(struct scrub_block *sblock) |
1837 | { | |
1838 | atomic_inc(&sblock->ref_count); | |
1839 | } | |
1840 | ||
1841 | static void scrub_block_put(struct scrub_block *sblock) | |
1842 | { | |
1843 | if (atomic_dec_and_test(&sblock->ref_count)) { | |
1844 | int i; | |
1845 | ||
1846 | for (i = 0; i < sblock->page_count; i++) | |
7a9e9987 | 1847 | scrub_page_put(sblock->pagev[i]); |
b5d67f64 SB |
1848 | kfree(sblock); |
1849 | } | |
1850 | } | |
1851 | ||
7a9e9987 SB |
1852 | static void scrub_page_get(struct scrub_page *spage) |
1853 | { | |
1854 | atomic_inc(&spage->ref_count); | |
1855 | } | |
1856 | ||
1857 | static void scrub_page_put(struct scrub_page *spage) | |
1858 | { | |
1859 | if (atomic_dec_and_test(&spage->ref_count)) { | |
1860 | if (spage->page) | |
1861 | __free_page(spage->page); | |
1862 | kfree(spage); | |
1863 | } | |
1864 | } | |
1865 | ||
d9d181c1 | 1866 | static void scrub_submit(struct scrub_ctx *sctx) |
a2de733c AJ |
1867 | { |
1868 | struct scrub_bio *sbio; | |
1869 | ||
d9d181c1 | 1870 | if (sctx->curr == -1) |
1623edeb | 1871 | return; |
a2de733c | 1872 | |
d9d181c1 SB |
1873 | sbio = sctx->bios[sctx->curr]; |
1874 | sctx->curr = -1; | |
b6bfebc1 | 1875 | scrub_pending_bio_inc(sctx); |
a2de733c | 1876 | |
ff023aac SB |
1877 | if (!sbio->bio->bi_bdev) { |
1878 | /* | |
1879 | * this case should not happen. If btrfs_map_block() is | |
1880 | * wrong, it could happen for dev-replace operations on | |
1881 | * missing devices when no mirrors are available, but in | |
1882 | * this case it should already fail the mount. | |
1883 | * This case is handled correctly (but _very_ slowly). | |
1884 | */ | |
1885 | printk_ratelimited(KERN_WARNING | |
1886 | "btrfs: scrub_submit(bio bdev == NULL) is unexpected!\n"); | |
1887 | bio_endio(sbio->bio, -EIO); | |
1888 | } else { | |
1889 | btrfsic_submit_bio(READ, sbio->bio); | |
1890 | } | |
a2de733c AJ |
1891 | } |
1892 | ||
ff023aac SB |
1893 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
1894 | struct scrub_page *spage) | |
a2de733c | 1895 | { |
b5d67f64 | 1896 | struct scrub_block *sblock = spage->sblock; |
a2de733c | 1897 | struct scrub_bio *sbio; |
69f4cb52 | 1898 | int ret; |
a2de733c AJ |
1899 | |
1900 | again: | |
1901 | /* | |
1902 | * grab a fresh bio or wait for one to become available | |
1903 | */ | |
d9d181c1 SB |
1904 | while (sctx->curr == -1) { |
1905 | spin_lock(&sctx->list_lock); | |
1906 | sctx->curr = sctx->first_free; | |
1907 | if (sctx->curr != -1) { | |
1908 | sctx->first_free = sctx->bios[sctx->curr]->next_free; | |
1909 | sctx->bios[sctx->curr]->next_free = -1; | |
1910 | sctx->bios[sctx->curr]->page_count = 0; | |
1911 | spin_unlock(&sctx->list_lock); | |
a2de733c | 1912 | } else { |
d9d181c1 SB |
1913 | spin_unlock(&sctx->list_lock); |
1914 | wait_event(sctx->list_wait, sctx->first_free != -1); | |
a2de733c AJ |
1915 | } |
1916 | } | |
d9d181c1 | 1917 | sbio = sctx->bios[sctx->curr]; |
b5d67f64 | 1918 | if (sbio->page_count == 0) { |
69f4cb52 AJ |
1919 | struct bio *bio; |
1920 | ||
b5d67f64 SB |
1921 | sbio->physical = spage->physical; |
1922 | sbio->logical = spage->logical; | |
a36cf8b8 | 1923 | sbio->dev = spage->dev; |
b5d67f64 SB |
1924 | bio = sbio->bio; |
1925 | if (!bio) { | |
ff023aac | 1926 | bio = bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio); |
b5d67f64 SB |
1927 | if (!bio) |
1928 | return -ENOMEM; | |
1929 | sbio->bio = bio; | |
1930 | } | |
69f4cb52 AJ |
1931 | |
1932 | bio->bi_private = sbio; | |
1933 | bio->bi_end_io = scrub_bio_end_io; | |
a36cf8b8 SB |
1934 | bio->bi_bdev = sbio->dev->bdev; |
1935 | bio->bi_sector = sbio->physical >> 9; | |
69f4cb52 | 1936 | sbio->err = 0; |
b5d67f64 SB |
1937 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
1938 | spage->physical || | |
1939 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
a36cf8b8 SB |
1940 | spage->logical || |
1941 | sbio->dev != spage->dev) { | |
d9d181c1 | 1942 | scrub_submit(sctx); |
a2de733c AJ |
1943 | goto again; |
1944 | } | |
69f4cb52 | 1945 | |
b5d67f64 SB |
1946 | sbio->pagev[sbio->page_count] = spage; |
1947 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1948 | if (ret != PAGE_SIZE) { | |
1949 | if (sbio->page_count < 1) { | |
1950 | bio_put(sbio->bio); | |
1951 | sbio->bio = NULL; | |
1952 | return -EIO; | |
1953 | } | |
d9d181c1 | 1954 | scrub_submit(sctx); |
69f4cb52 AJ |
1955 | goto again; |
1956 | } | |
1957 | ||
ff023aac | 1958 | scrub_block_get(sblock); /* one for the page added to the bio */ |
b5d67f64 SB |
1959 | atomic_inc(&sblock->outstanding_pages); |
1960 | sbio->page_count++; | |
ff023aac | 1961 | if (sbio->page_count == sctx->pages_per_rd_bio) |
d9d181c1 | 1962 | scrub_submit(sctx); |
b5d67f64 SB |
1963 | |
1964 | return 0; | |
1965 | } | |
1966 | ||
d9d181c1 | 1967 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 1968 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
1969 | u64 gen, int mirror_num, u8 *csum, int force, |
1970 | u64 physical_for_dev_replace) | |
b5d67f64 SB |
1971 | { |
1972 | struct scrub_block *sblock; | |
1973 | int index; | |
1974 | ||
1975 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
1976 | if (!sblock) { | |
d9d181c1 SB |
1977 | spin_lock(&sctx->stat_lock); |
1978 | sctx->stat.malloc_errors++; | |
1979 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 1980 | return -ENOMEM; |
a2de733c | 1981 | } |
b5d67f64 | 1982 | |
7a9e9987 SB |
1983 | /* one ref inside this function, plus one for each page added to |
1984 | * a bio later on */ | |
b5d67f64 | 1985 | atomic_set(&sblock->ref_count, 1); |
d9d181c1 | 1986 | sblock->sctx = sctx; |
b5d67f64 SB |
1987 | sblock->no_io_error_seen = 1; |
1988 | ||
1989 | for (index = 0; len > 0; index++) { | |
7a9e9987 | 1990 | struct scrub_page *spage; |
b5d67f64 SB |
1991 | u64 l = min_t(u64, len, PAGE_SIZE); |
1992 | ||
7a9e9987 SB |
1993 | spage = kzalloc(sizeof(*spage), GFP_NOFS); |
1994 | if (!spage) { | |
1995 | leave_nomem: | |
d9d181c1 SB |
1996 | spin_lock(&sctx->stat_lock); |
1997 | sctx->stat.malloc_errors++; | |
1998 | spin_unlock(&sctx->stat_lock); | |
7a9e9987 | 1999 | scrub_block_put(sblock); |
b5d67f64 SB |
2000 | return -ENOMEM; |
2001 | } | |
7a9e9987 SB |
2002 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
2003 | scrub_page_get(spage); | |
2004 | sblock->pagev[index] = spage; | |
b5d67f64 | 2005 | spage->sblock = sblock; |
a36cf8b8 | 2006 | spage->dev = dev; |
b5d67f64 SB |
2007 | spage->flags = flags; |
2008 | spage->generation = gen; | |
2009 | spage->logical = logical; | |
2010 | spage->physical = physical; | |
ff023aac | 2011 | spage->physical_for_dev_replace = physical_for_dev_replace; |
b5d67f64 SB |
2012 | spage->mirror_num = mirror_num; |
2013 | if (csum) { | |
2014 | spage->have_csum = 1; | |
d9d181c1 | 2015 | memcpy(spage->csum, csum, sctx->csum_size); |
b5d67f64 SB |
2016 | } else { |
2017 | spage->have_csum = 0; | |
2018 | } | |
2019 | sblock->page_count++; | |
7a9e9987 SB |
2020 | spage->page = alloc_page(GFP_NOFS); |
2021 | if (!spage->page) | |
2022 | goto leave_nomem; | |
b5d67f64 SB |
2023 | len -= l; |
2024 | logical += l; | |
2025 | physical += l; | |
ff023aac | 2026 | physical_for_dev_replace += l; |
b5d67f64 SB |
2027 | } |
2028 | ||
7a9e9987 | 2029 | WARN_ON(sblock->page_count == 0); |
b5d67f64 | 2030 | for (index = 0; index < sblock->page_count; index++) { |
7a9e9987 | 2031 | struct scrub_page *spage = sblock->pagev[index]; |
1bc87793 AJ |
2032 | int ret; |
2033 | ||
ff023aac | 2034 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
b5d67f64 SB |
2035 | if (ret) { |
2036 | scrub_block_put(sblock); | |
1bc87793 | 2037 | return ret; |
b5d67f64 | 2038 | } |
1bc87793 | 2039 | } |
a2de733c | 2040 | |
b5d67f64 | 2041 | if (force) |
d9d181c1 | 2042 | scrub_submit(sctx); |
a2de733c | 2043 | |
b5d67f64 SB |
2044 | /* last one frees, either here or in bio completion for last page */ |
2045 | scrub_block_put(sblock); | |
a2de733c AJ |
2046 | return 0; |
2047 | } | |
2048 | ||
b5d67f64 SB |
2049 | static void scrub_bio_end_io(struct bio *bio, int err) |
2050 | { | |
2051 | struct scrub_bio *sbio = bio->bi_private; | |
a36cf8b8 | 2052 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
b5d67f64 SB |
2053 | |
2054 | sbio->err = err; | |
2055 | sbio->bio = bio; | |
2056 | ||
2057 | btrfs_queue_worker(&fs_info->scrub_workers, &sbio->work); | |
2058 | } | |
2059 | ||
2060 | static void scrub_bio_end_io_worker(struct btrfs_work *work) | |
2061 | { | |
2062 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
d9d181c1 | 2063 | struct scrub_ctx *sctx = sbio->sctx; |
b5d67f64 SB |
2064 | int i; |
2065 | ||
ff023aac | 2066 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
2067 | if (sbio->err) { |
2068 | for (i = 0; i < sbio->page_count; i++) { | |
2069 | struct scrub_page *spage = sbio->pagev[i]; | |
2070 | ||
2071 | spage->io_error = 1; | |
2072 | spage->sblock->no_io_error_seen = 0; | |
2073 | } | |
2074 | } | |
2075 | ||
2076 | /* now complete the scrub_block items that have all pages completed */ | |
2077 | for (i = 0; i < sbio->page_count; i++) { | |
2078 | struct scrub_page *spage = sbio->pagev[i]; | |
2079 | struct scrub_block *sblock = spage->sblock; | |
2080 | ||
2081 | if (atomic_dec_and_test(&sblock->outstanding_pages)) | |
2082 | scrub_block_complete(sblock); | |
2083 | scrub_block_put(sblock); | |
2084 | } | |
2085 | ||
b5d67f64 SB |
2086 | bio_put(sbio->bio); |
2087 | sbio->bio = NULL; | |
d9d181c1 SB |
2088 | spin_lock(&sctx->list_lock); |
2089 | sbio->next_free = sctx->first_free; | |
2090 | sctx->first_free = sbio->index; | |
2091 | spin_unlock(&sctx->list_lock); | |
ff023aac SB |
2092 | |
2093 | if (sctx->is_dev_replace && | |
2094 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { | |
2095 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2096 | scrub_wr_submit(sctx); | |
2097 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2098 | } | |
2099 | ||
b6bfebc1 | 2100 | scrub_pending_bio_dec(sctx); |
b5d67f64 SB |
2101 | } |
2102 | ||
2103 | static void scrub_block_complete(struct scrub_block *sblock) | |
2104 | { | |
ff023aac | 2105 | if (!sblock->no_io_error_seen) { |
b5d67f64 | 2106 | scrub_handle_errored_block(sblock); |
ff023aac SB |
2107 | } else { |
2108 | /* | |
2109 | * if has checksum error, write via repair mechanism in | |
2110 | * dev replace case, otherwise write here in dev replace | |
2111 | * case. | |
2112 | */ | |
2113 | if (!scrub_checksum(sblock) && sblock->sctx->is_dev_replace) | |
2114 | scrub_write_block_to_dev_replace(sblock); | |
2115 | } | |
b5d67f64 SB |
2116 | } |
2117 | ||
d9d181c1 | 2118 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len, |
a2de733c AJ |
2119 | u8 *csum) |
2120 | { | |
2121 | struct btrfs_ordered_sum *sum = NULL; | |
2122 | int ret = 0; | |
2123 | unsigned long i; | |
2124 | unsigned long num_sectors; | |
a2de733c | 2125 | |
d9d181c1 SB |
2126 | while (!list_empty(&sctx->csum_list)) { |
2127 | sum = list_first_entry(&sctx->csum_list, | |
a2de733c AJ |
2128 | struct btrfs_ordered_sum, list); |
2129 | if (sum->bytenr > logical) | |
2130 | return 0; | |
2131 | if (sum->bytenr + sum->len > logical) | |
2132 | break; | |
2133 | ||
d9d181c1 | 2134 | ++sctx->stat.csum_discards; |
a2de733c AJ |
2135 | list_del(&sum->list); |
2136 | kfree(sum); | |
2137 | sum = NULL; | |
2138 | } | |
2139 | if (!sum) | |
2140 | return 0; | |
2141 | ||
d9d181c1 | 2142 | num_sectors = sum->len / sctx->sectorsize; |
a2de733c AJ |
2143 | for (i = 0; i < num_sectors; ++i) { |
2144 | if (sum->sums[i].bytenr == logical) { | |
d9d181c1 | 2145 | memcpy(csum, &sum->sums[i].sum, sctx->csum_size); |
a2de733c AJ |
2146 | ret = 1; |
2147 | break; | |
2148 | } | |
2149 | } | |
2150 | if (ret && i == num_sectors - 1) { | |
2151 | list_del(&sum->list); | |
2152 | kfree(sum); | |
2153 | } | |
2154 | return ret; | |
2155 | } | |
2156 | ||
2157 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
d9d181c1 | 2158 | static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2159 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac | 2160 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
a2de733c AJ |
2161 | { |
2162 | int ret; | |
2163 | u8 csum[BTRFS_CSUM_SIZE]; | |
b5d67f64 SB |
2164 | u32 blocksize; |
2165 | ||
2166 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
d9d181c1 SB |
2167 | blocksize = sctx->sectorsize; |
2168 | spin_lock(&sctx->stat_lock); | |
2169 | sctx->stat.data_extents_scrubbed++; | |
2170 | sctx->stat.data_bytes_scrubbed += len; | |
2171 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2172 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
ff023aac | 2173 | WARN_ON(sctx->nodesize != sctx->leafsize); |
d9d181c1 SB |
2174 | blocksize = sctx->nodesize; |
2175 | spin_lock(&sctx->stat_lock); | |
2176 | sctx->stat.tree_extents_scrubbed++; | |
2177 | sctx->stat.tree_bytes_scrubbed += len; | |
2178 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2179 | } else { |
d9d181c1 | 2180 | blocksize = sctx->sectorsize; |
ff023aac | 2181 | WARN_ON(1); |
b5d67f64 | 2182 | } |
a2de733c AJ |
2183 | |
2184 | while (len) { | |
b5d67f64 | 2185 | u64 l = min_t(u64, len, blocksize); |
a2de733c AJ |
2186 | int have_csum = 0; |
2187 | ||
2188 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2189 | /* push csums to sbio */ | |
d9d181c1 | 2190 | have_csum = scrub_find_csum(sctx, logical, l, csum); |
a2de733c | 2191 | if (have_csum == 0) |
d9d181c1 | 2192 | ++sctx->stat.no_csum; |
ff023aac SB |
2193 | if (sctx->is_dev_replace && !have_csum) { |
2194 | ret = copy_nocow_pages(sctx, logical, l, | |
2195 | mirror_num, | |
2196 | physical_for_dev_replace); | |
2197 | goto behind_scrub_pages; | |
2198 | } | |
a2de733c | 2199 | } |
a36cf8b8 | 2200 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
ff023aac SB |
2201 | mirror_num, have_csum ? csum : NULL, 0, |
2202 | physical_for_dev_replace); | |
2203 | behind_scrub_pages: | |
a2de733c AJ |
2204 | if (ret) |
2205 | return ret; | |
2206 | len -= l; | |
2207 | logical += l; | |
2208 | physical += l; | |
ff023aac | 2209 | physical_for_dev_replace += l; |
a2de733c AJ |
2210 | } |
2211 | return 0; | |
2212 | } | |
2213 | ||
d9d181c1 | 2214 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
a36cf8b8 SB |
2215 | struct map_lookup *map, |
2216 | struct btrfs_device *scrub_dev, | |
ff023aac SB |
2217 | int num, u64 base, u64 length, |
2218 | int is_dev_replace) | |
a2de733c AJ |
2219 | { |
2220 | struct btrfs_path *path; | |
a36cf8b8 | 2221 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
a2de733c AJ |
2222 | struct btrfs_root *root = fs_info->extent_root; |
2223 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2224 | struct btrfs_extent_item *extent; | |
e7786c3a | 2225 | struct blk_plug plug; |
a2de733c AJ |
2226 | u64 flags; |
2227 | int ret; | |
2228 | int slot; | |
2229 | int i; | |
2230 | u64 nstripes; | |
a2de733c AJ |
2231 | struct extent_buffer *l; |
2232 | struct btrfs_key key; | |
2233 | u64 physical; | |
2234 | u64 logical; | |
2235 | u64 generation; | |
e12fa9cd | 2236 | int mirror_num; |
7a26285e AJ |
2237 | struct reada_control *reada1; |
2238 | struct reada_control *reada2; | |
2239 | struct btrfs_key key_start; | |
2240 | struct btrfs_key key_end; | |
a2de733c AJ |
2241 | u64 increment = map->stripe_len; |
2242 | u64 offset; | |
ff023aac SB |
2243 | u64 extent_logical; |
2244 | u64 extent_physical; | |
2245 | u64 extent_len; | |
2246 | struct btrfs_device *extent_dev; | |
2247 | int extent_mirror_num; | |
a2de733c AJ |
2248 | |
2249 | nstripes = length; | |
2250 | offset = 0; | |
2251 | do_div(nstripes, map->stripe_len); | |
2252 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
2253 | offset = map->stripe_len * num; | |
2254 | increment = map->stripe_len * map->num_stripes; | |
193ea74b | 2255 | mirror_num = 1; |
a2de733c AJ |
2256 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
2257 | int factor = map->num_stripes / map->sub_stripes; | |
2258 | offset = map->stripe_len * (num / map->sub_stripes); | |
2259 | increment = map->stripe_len * factor; | |
193ea74b | 2260 | mirror_num = num % map->sub_stripes + 1; |
a2de733c AJ |
2261 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
2262 | increment = map->stripe_len; | |
193ea74b | 2263 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
2264 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
2265 | increment = map->stripe_len; | |
193ea74b | 2266 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
2267 | } else { |
2268 | increment = map->stripe_len; | |
193ea74b | 2269 | mirror_num = 1; |
a2de733c AJ |
2270 | } |
2271 | ||
2272 | path = btrfs_alloc_path(); | |
2273 | if (!path) | |
2274 | return -ENOMEM; | |
2275 | ||
b5d67f64 SB |
2276 | /* |
2277 | * work on commit root. The related disk blocks are static as | |
2278 | * long as COW is applied. This means, it is save to rewrite | |
2279 | * them to repair disk errors without any race conditions | |
2280 | */ | |
a2de733c AJ |
2281 | path->search_commit_root = 1; |
2282 | path->skip_locking = 1; | |
2283 | ||
2284 | /* | |
7a26285e AJ |
2285 | * trigger the readahead for extent tree csum tree and wait for |
2286 | * completion. During readahead, the scrub is officially paused | |
2287 | * to not hold off transaction commits | |
a2de733c AJ |
2288 | */ |
2289 | logical = base + offset; | |
a2de733c | 2290 | |
d9d181c1 | 2291 | wait_event(sctx->list_wait, |
b6bfebc1 | 2292 | atomic_read(&sctx->bios_in_flight) == 0); |
7a26285e AJ |
2293 | atomic_inc(&fs_info->scrubs_paused); |
2294 | wake_up(&fs_info->scrub_pause_wait); | |
2295 | ||
2296 | /* FIXME it might be better to start readahead at commit root */ | |
2297 | key_start.objectid = logical; | |
2298 | key_start.type = BTRFS_EXTENT_ITEM_KEY; | |
2299 | key_start.offset = (u64)0; | |
2300 | key_end.objectid = base + offset + nstripes * increment; | |
2301 | key_end.type = BTRFS_EXTENT_ITEM_KEY; | |
2302 | key_end.offset = (u64)0; | |
2303 | reada1 = btrfs_reada_add(root, &key_start, &key_end); | |
2304 | ||
2305 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
2306 | key_start.type = BTRFS_EXTENT_CSUM_KEY; | |
2307 | key_start.offset = logical; | |
2308 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
2309 | key_end.type = BTRFS_EXTENT_CSUM_KEY; | |
2310 | key_end.offset = base + offset + nstripes * increment; | |
2311 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); | |
2312 | ||
2313 | if (!IS_ERR(reada1)) | |
2314 | btrfs_reada_wait(reada1); | |
2315 | if (!IS_ERR(reada2)) | |
2316 | btrfs_reada_wait(reada2); | |
2317 | ||
2318 | mutex_lock(&fs_info->scrub_lock); | |
2319 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
2320 | mutex_unlock(&fs_info->scrub_lock); | |
2321 | wait_event(fs_info->scrub_pause_wait, | |
2322 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
2323 | mutex_lock(&fs_info->scrub_lock); | |
a2de733c | 2324 | } |
7a26285e AJ |
2325 | atomic_dec(&fs_info->scrubs_paused); |
2326 | mutex_unlock(&fs_info->scrub_lock); | |
2327 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
2328 | |
2329 | /* | |
2330 | * collect all data csums for the stripe to avoid seeking during | |
2331 | * the scrub. This might currently (crc32) end up to be about 1MB | |
2332 | */ | |
e7786c3a | 2333 | blk_start_plug(&plug); |
a2de733c | 2334 | |
a2de733c AJ |
2335 | /* |
2336 | * now find all extents for each stripe and scrub them | |
2337 | */ | |
7a26285e AJ |
2338 | logical = base + offset; |
2339 | physical = map->stripes[num].physical; | |
a2de733c | 2340 | ret = 0; |
7a26285e | 2341 | for (i = 0; i < nstripes; ++i) { |
a2de733c AJ |
2342 | /* |
2343 | * canceled? | |
2344 | */ | |
2345 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
d9d181c1 | 2346 | atomic_read(&sctx->cancel_req)) { |
a2de733c AJ |
2347 | ret = -ECANCELED; |
2348 | goto out; | |
2349 | } | |
2350 | /* | |
2351 | * check to see if we have to pause | |
2352 | */ | |
2353 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
2354 | /* push queued extents */ | |
ff023aac | 2355 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
d9d181c1 | 2356 | scrub_submit(sctx); |
ff023aac SB |
2357 | mutex_lock(&sctx->wr_ctx.wr_lock); |
2358 | scrub_wr_submit(sctx); | |
2359 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
d9d181c1 | 2360 | wait_event(sctx->list_wait, |
b6bfebc1 | 2361 | atomic_read(&sctx->bios_in_flight) == 0); |
ff023aac | 2362 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
a2de733c AJ |
2363 | atomic_inc(&fs_info->scrubs_paused); |
2364 | wake_up(&fs_info->scrub_pause_wait); | |
2365 | mutex_lock(&fs_info->scrub_lock); | |
2366 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
2367 | mutex_unlock(&fs_info->scrub_lock); | |
2368 | wait_event(fs_info->scrub_pause_wait, | |
2369 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
2370 | mutex_lock(&fs_info->scrub_lock); | |
2371 | } | |
2372 | atomic_dec(&fs_info->scrubs_paused); | |
2373 | mutex_unlock(&fs_info->scrub_lock); | |
2374 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
2375 | } |
2376 | ||
7a26285e AJ |
2377 | ret = btrfs_lookup_csums_range(csum_root, logical, |
2378 | logical + map->stripe_len - 1, | |
d9d181c1 | 2379 | &sctx->csum_list, 1); |
7a26285e AJ |
2380 | if (ret) |
2381 | goto out; | |
2382 | ||
a2de733c AJ |
2383 | key.objectid = logical; |
2384 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2385 | key.offset = (u64)0; | |
2386 | ||
2387 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2388 | if (ret < 0) | |
2389 | goto out; | |
8c51032f | 2390 | if (ret > 0) { |
a2de733c AJ |
2391 | ret = btrfs_previous_item(root, path, 0, |
2392 | BTRFS_EXTENT_ITEM_KEY); | |
2393 | if (ret < 0) | |
2394 | goto out; | |
8c51032f AJ |
2395 | if (ret > 0) { |
2396 | /* there's no smaller item, so stick with the | |
2397 | * larger one */ | |
2398 | btrfs_release_path(path); | |
2399 | ret = btrfs_search_slot(NULL, root, &key, | |
2400 | path, 0, 0); | |
2401 | if (ret < 0) | |
2402 | goto out; | |
2403 | } | |
a2de733c AJ |
2404 | } |
2405 | ||
2406 | while (1) { | |
2407 | l = path->nodes[0]; | |
2408 | slot = path->slots[0]; | |
2409 | if (slot >= btrfs_header_nritems(l)) { | |
2410 | ret = btrfs_next_leaf(root, path); | |
2411 | if (ret == 0) | |
2412 | continue; | |
2413 | if (ret < 0) | |
2414 | goto out; | |
2415 | ||
2416 | break; | |
2417 | } | |
2418 | btrfs_item_key_to_cpu(l, &key, slot); | |
2419 | ||
2420 | if (key.objectid + key.offset <= logical) | |
2421 | goto next; | |
2422 | ||
2423 | if (key.objectid >= logical + map->stripe_len) | |
2424 | break; | |
2425 | ||
2426 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) | |
2427 | goto next; | |
2428 | ||
2429 | extent = btrfs_item_ptr(l, slot, | |
2430 | struct btrfs_extent_item); | |
2431 | flags = btrfs_extent_flags(l, extent); | |
2432 | generation = btrfs_extent_generation(l, extent); | |
2433 | ||
2434 | if (key.objectid < logical && | |
2435 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { | |
2436 | printk(KERN_ERR | |
2437 | "btrfs scrub: tree block %llu spanning " | |
2438 | "stripes, ignored. logical=%llu\n", | |
2439 | (unsigned long long)key.objectid, | |
2440 | (unsigned long long)logical); | |
2441 | goto next; | |
2442 | } | |
2443 | ||
2444 | /* | |
2445 | * trim extent to this stripe | |
2446 | */ | |
2447 | if (key.objectid < logical) { | |
2448 | key.offset -= logical - key.objectid; | |
2449 | key.objectid = logical; | |
2450 | } | |
2451 | if (key.objectid + key.offset > | |
2452 | logical + map->stripe_len) { | |
2453 | key.offset = logical + map->stripe_len - | |
2454 | key.objectid; | |
2455 | } | |
2456 | ||
ff023aac SB |
2457 | extent_logical = key.objectid; |
2458 | extent_physical = key.objectid - logical + physical; | |
2459 | extent_len = key.offset; | |
2460 | extent_dev = scrub_dev; | |
2461 | extent_mirror_num = mirror_num; | |
2462 | if (is_dev_replace) | |
2463 | scrub_remap_extent(fs_info, extent_logical, | |
2464 | extent_len, &extent_physical, | |
2465 | &extent_dev, | |
2466 | &extent_mirror_num); | |
2467 | ret = scrub_extent(sctx, extent_logical, extent_len, | |
2468 | extent_physical, extent_dev, flags, | |
2469 | generation, extent_mirror_num, | |
2470 | key.objectid - logical + physical); | |
a2de733c AJ |
2471 | if (ret) |
2472 | goto out; | |
2473 | ||
2474 | next: | |
2475 | path->slots[0]++; | |
2476 | } | |
71267333 | 2477 | btrfs_release_path(path); |
a2de733c AJ |
2478 | logical += increment; |
2479 | physical += map->stripe_len; | |
d9d181c1 SB |
2480 | spin_lock(&sctx->stat_lock); |
2481 | sctx->stat.last_physical = physical; | |
2482 | spin_unlock(&sctx->stat_lock); | |
a2de733c | 2483 | } |
ff023aac | 2484 | out: |
a2de733c | 2485 | /* push queued extents */ |
d9d181c1 | 2486 | scrub_submit(sctx); |
ff023aac SB |
2487 | mutex_lock(&sctx->wr_ctx.wr_lock); |
2488 | scrub_wr_submit(sctx); | |
2489 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
a2de733c | 2490 | |
e7786c3a | 2491 | blk_finish_plug(&plug); |
a2de733c AJ |
2492 | btrfs_free_path(path); |
2493 | return ret < 0 ? ret : 0; | |
2494 | } | |
2495 | ||
d9d181c1 | 2496 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
a36cf8b8 SB |
2497 | struct btrfs_device *scrub_dev, |
2498 | u64 chunk_tree, u64 chunk_objectid, | |
2499 | u64 chunk_offset, u64 length, | |
ff023aac | 2500 | u64 dev_offset, int is_dev_replace) |
a2de733c AJ |
2501 | { |
2502 | struct btrfs_mapping_tree *map_tree = | |
a36cf8b8 | 2503 | &sctx->dev_root->fs_info->mapping_tree; |
a2de733c AJ |
2504 | struct map_lookup *map; |
2505 | struct extent_map *em; | |
2506 | int i; | |
ff023aac | 2507 | int ret = 0; |
a2de733c AJ |
2508 | |
2509 | read_lock(&map_tree->map_tree.lock); | |
2510 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | |
2511 | read_unlock(&map_tree->map_tree.lock); | |
2512 | ||
2513 | if (!em) | |
2514 | return -EINVAL; | |
2515 | ||
2516 | map = (struct map_lookup *)em->bdev; | |
2517 | if (em->start != chunk_offset) | |
2518 | goto out; | |
2519 | ||
2520 | if (em->len < length) | |
2521 | goto out; | |
2522 | ||
2523 | for (i = 0; i < map->num_stripes; ++i) { | |
a36cf8b8 | 2524 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
859acaf1 | 2525 | map->stripes[i].physical == dev_offset) { |
a36cf8b8 | 2526 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
ff023aac SB |
2527 | chunk_offset, length, |
2528 | is_dev_replace); | |
a2de733c AJ |
2529 | if (ret) |
2530 | goto out; | |
2531 | } | |
2532 | } | |
2533 | out: | |
2534 | free_extent_map(em); | |
2535 | ||
2536 | return ret; | |
2537 | } | |
2538 | ||
2539 | static noinline_for_stack | |
a36cf8b8 | 2540 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
ff023aac SB |
2541 | struct btrfs_device *scrub_dev, u64 start, u64 end, |
2542 | int is_dev_replace) | |
a2de733c AJ |
2543 | { |
2544 | struct btrfs_dev_extent *dev_extent = NULL; | |
2545 | struct btrfs_path *path; | |
a36cf8b8 | 2546 | struct btrfs_root *root = sctx->dev_root; |
a2de733c AJ |
2547 | struct btrfs_fs_info *fs_info = root->fs_info; |
2548 | u64 length; | |
2549 | u64 chunk_tree; | |
2550 | u64 chunk_objectid; | |
2551 | u64 chunk_offset; | |
2552 | int ret; | |
2553 | int slot; | |
2554 | struct extent_buffer *l; | |
2555 | struct btrfs_key key; | |
2556 | struct btrfs_key found_key; | |
2557 | struct btrfs_block_group_cache *cache; | |
ff023aac | 2558 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
a2de733c AJ |
2559 | |
2560 | path = btrfs_alloc_path(); | |
2561 | if (!path) | |
2562 | return -ENOMEM; | |
2563 | ||
2564 | path->reada = 2; | |
2565 | path->search_commit_root = 1; | |
2566 | path->skip_locking = 1; | |
2567 | ||
a36cf8b8 | 2568 | key.objectid = scrub_dev->devid; |
a2de733c AJ |
2569 | key.offset = 0ull; |
2570 | key.type = BTRFS_DEV_EXTENT_KEY; | |
2571 | ||
a2de733c AJ |
2572 | while (1) { |
2573 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2574 | if (ret < 0) | |
8c51032f AJ |
2575 | break; |
2576 | if (ret > 0) { | |
2577 | if (path->slots[0] >= | |
2578 | btrfs_header_nritems(path->nodes[0])) { | |
2579 | ret = btrfs_next_leaf(root, path); | |
2580 | if (ret) | |
2581 | break; | |
2582 | } | |
2583 | } | |
a2de733c AJ |
2584 | |
2585 | l = path->nodes[0]; | |
2586 | slot = path->slots[0]; | |
2587 | ||
2588 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
2589 | ||
a36cf8b8 | 2590 | if (found_key.objectid != scrub_dev->devid) |
a2de733c AJ |
2591 | break; |
2592 | ||
8c51032f | 2593 | if (btrfs_key_type(&found_key) != BTRFS_DEV_EXTENT_KEY) |
a2de733c AJ |
2594 | break; |
2595 | ||
2596 | if (found_key.offset >= end) | |
2597 | break; | |
2598 | ||
2599 | if (found_key.offset < key.offset) | |
2600 | break; | |
2601 | ||
2602 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
2603 | length = btrfs_dev_extent_length(l, dev_extent); | |
2604 | ||
2605 | if (found_key.offset + length <= start) { | |
2606 | key.offset = found_key.offset + length; | |
71267333 | 2607 | btrfs_release_path(path); |
a2de733c AJ |
2608 | continue; |
2609 | } | |
2610 | ||
2611 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
2612 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
2613 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
2614 | ||
2615 | /* | |
2616 | * get a reference on the corresponding block group to prevent | |
2617 | * the chunk from going away while we scrub it | |
2618 | */ | |
2619 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
2620 | if (!cache) { | |
2621 | ret = -ENOENT; | |
8c51032f | 2622 | break; |
a2de733c | 2623 | } |
ff023aac SB |
2624 | dev_replace->cursor_right = found_key.offset + length; |
2625 | dev_replace->cursor_left = found_key.offset; | |
2626 | dev_replace->item_needs_writeback = 1; | |
a36cf8b8 | 2627 | ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid, |
ff023aac SB |
2628 | chunk_offset, length, found_key.offset, |
2629 | is_dev_replace); | |
2630 | ||
2631 | /* | |
2632 | * flush, submit all pending read and write bios, afterwards | |
2633 | * wait for them. | |
2634 | * Note that in the dev replace case, a read request causes | |
2635 | * write requests that are submitted in the read completion | |
2636 | * worker. Therefore in the current situation, it is required | |
2637 | * that all write requests are flushed, so that all read and | |
2638 | * write requests are really completed when bios_in_flight | |
2639 | * changes to 0. | |
2640 | */ | |
2641 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); | |
2642 | scrub_submit(sctx); | |
2643 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2644 | scrub_wr_submit(sctx); | |
2645 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2646 | ||
2647 | wait_event(sctx->list_wait, | |
2648 | atomic_read(&sctx->bios_in_flight) == 0); | |
2649 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); | |
2650 | atomic_inc(&fs_info->scrubs_paused); | |
2651 | wake_up(&fs_info->scrub_pause_wait); | |
2652 | wait_event(sctx->list_wait, | |
2653 | atomic_read(&sctx->workers_pending) == 0); | |
2654 | ||
2655 | mutex_lock(&fs_info->scrub_lock); | |
2656 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
2657 | mutex_unlock(&fs_info->scrub_lock); | |
2658 | wait_event(fs_info->scrub_pause_wait, | |
2659 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
2660 | mutex_lock(&fs_info->scrub_lock); | |
2661 | } | |
2662 | atomic_dec(&fs_info->scrubs_paused); | |
2663 | mutex_unlock(&fs_info->scrub_lock); | |
2664 | wake_up(&fs_info->scrub_pause_wait); | |
2665 | ||
2666 | dev_replace->cursor_left = dev_replace->cursor_right; | |
2667 | dev_replace->item_needs_writeback = 1; | |
a2de733c AJ |
2668 | btrfs_put_block_group(cache); |
2669 | if (ret) | |
2670 | break; | |
af1be4f8 SB |
2671 | if (is_dev_replace && |
2672 | atomic64_read(&dev_replace->num_write_errors) > 0) { | |
ff023aac SB |
2673 | ret = -EIO; |
2674 | break; | |
2675 | } | |
2676 | if (sctx->stat.malloc_errors > 0) { | |
2677 | ret = -ENOMEM; | |
2678 | break; | |
2679 | } | |
a2de733c AJ |
2680 | |
2681 | key.offset = found_key.offset + length; | |
71267333 | 2682 | btrfs_release_path(path); |
a2de733c AJ |
2683 | } |
2684 | ||
a2de733c | 2685 | btrfs_free_path(path); |
8c51032f AJ |
2686 | |
2687 | /* | |
2688 | * ret can still be 1 from search_slot or next_leaf, | |
2689 | * that's not an error | |
2690 | */ | |
2691 | return ret < 0 ? ret : 0; | |
a2de733c AJ |
2692 | } |
2693 | ||
a36cf8b8 SB |
2694 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
2695 | struct btrfs_device *scrub_dev) | |
a2de733c AJ |
2696 | { |
2697 | int i; | |
2698 | u64 bytenr; | |
2699 | u64 gen; | |
2700 | int ret; | |
a36cf8b8 | 2701 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 2702 | |
79787eaa JM |
2703 | if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) |
2704 | return -EIO; | |
2705 | ||
a2de733c AJ |
2706 | gen = root->fs_info->last_trans_committed; |
2707 | ||
2708 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
2709 | bytenr = btrfs_sb_offset(i); | |
a36cf8b8 | 2710 | if (bytenr + BTRFS_SUPER_INFO_SIZE > scrub_dev->total_bytes) |
a2de733c AJ |
2711 | break; |
2712 | ||
d9d181c1 | 2713 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
a36cf8b8 | 2714 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
ff023aac | 2715 | NULL, 1, bytenr); |
a2de733c AJ |
2716 | if (ret) |
2717 | return ret; | |
2718 | } | |
b6bfebc1 | 2719 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
2720 | |
2721 | return 0; | |
2722 | } | |
2723 | ||
2724 | /* | |
2725 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
2726 | */ | |
ff023aac SB |
2727 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
2728 | int is_dev_replace) | |
a2de733c | 2729 | { |
0dc3b84a | 2730 | int ret = 0; |
a2de733c AJ |
2731 | |
2732 | mutex_lock(&fs_info->scrub_lock); | |
632dd772 | 2733 | if (fs_info->scrub_workers_refcnt == 0) { |
ff023aac SB |
2734 | if (is_dev_replace) |
2735 | btrfs_init_workers(&fs_info->scrub_workers, "scrub", 1, | |
2736 | &fs_info->generic_worker); | |
2737 | else | |
2738 | btrfs_init_workers(&fs_info->scrub_workers, "scrub", | |
2739 | fs_info->thread_pool_size, | |
2740 | &fs_info->generic_worker); | |
632dd772 | 2741 | fs_info->scrub_workers.idle_thresh = 4; |
0dc3b84a JB |
2742 | ret = btrfs_start_workers(&fs_info->scrub_workers); |
2743 | if (ret) | |
2744 | goto out; | |
ff023aac SB |
2745 | btrfs_init_workers(&fs_info->scrub_wr_completion_workers, |
2746 | "scrubwrc", | |
2747 | fs_info->thread_pool_size, | |
2748 | &fs_info->generic_worker); | |
2749 | fs_info->scrub_wr_completion_workers.idle_thresh = 2; | |
2750 | ret = btrfs_start_workers( | |
2751 | &fs_info->scrub_wr_completion_workers); | |
2752 | if (ret) | |
2753 | goto out; | |
2754 | btrfs_init_workers(&fs_info->scrub_nocow_workers, "scrubnc", 1, | |
2755 | &fs_info->generic_worker); | |
2756 | ret = btrfs_start_workers(&fs_info->scrub_nocow_workers); | |
2757 | if (ret) | |
2758 | goto out; | |
632dd772 | 2759 | } |
a2de733c | 2760 | ++fs_info->scrub_workers_refcnt; |
0dc3b84a | 2761 | out: |
a2de733c AJ |
2762 | mutex_unlock(&fs_info->scrub_lock); |
2763 | ||
0dc3b84a | 2764 | return ret; |
a2de733c AJ |
2765 | } |
2766 | ||
aa1b8cd4 | 2767 | static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info) |
a2de733c | 2768 | { |
a2de733c | 2769 | mutex_lock(&fs_info->scrub_lock); |
ff023aac | 2770 | if (--fs_info->scrub_workers_refcnt == 0) { |
a2de733c | 2771 | btrfs_stop_workers(&fs_info->scrub_workers); |
ff023aac SB |
2772 | btrfs_stop_workers(&fs_info->scrub_wr_completion_workers); |
2773 | btrfs_stop_workers(&fs_info->scrub_nocow_workers); | |
2774 | } | |
a2de733c AJ |
2775 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
2776 | mutex_unlock(&fs_info->scrub_lock); | |
2777 | } | |
2778 | ||
aa1b8cd4 SB |
2779 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
2780 | u64 end, struct btrfs_scrub_progress *progress, | |
63a212ab | 2781 | int readonly, int is_dev_replace) |
a2de733c | 2782 | { |
d9d181c1 | 2783 | struct scrub_ctx *sctx; |
a2de733c AJ |
2784 | int ret; |
2785 | struct btrfs_device *dev; | |
2786 | ||
aa1b8cd4 | 2787 | if (btrfs_fs_closing(fs_info)) |
a2de733c AJ |
2788 | return -EINVAL; |
2789 | ||
2790 | /* | |
2791 | * check some assumptions | |
2792 | */ | |
aa1b8cd4 | 2793 | if (fs_info->chunk_root->nodesize != fs_info->chunk_root->leafsize) { |
b5d67f64 SB |
2794 | printk(KERN_ERR |
2795 | "btrfs_scrub: size assumption nodesize == leafsize (%d == %d) fails\n", | |
aa1b8cd4 SB |
2796 | fs_info->chunk_root->nodesize, |
2797 | fs_info->chunk_root->leafsize); | |
b5d67f64 SB |
2798 | return -EINVAL; |
2799 | } | |
2800 | ||
aa1b8cd4 | 2801 | if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) { |
b5d67f64 SB |
2802 | /* |
2803 | * in this case scrub is unable to calculate the checksum | |
2804 | * the way scrub is implemented. Do not handle this | |
2805 | * situation at all because it won't ever happen. | |
2806 | */ | |
2807 | printk(KERN_ERR | |
2808 | "btrfs_scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails\n", | |
aa1b8cd4 | 2809 | fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN); |
b5d67f64 SB |
2810 | return -EINVAL; |
2811 | } | |
2812 | ||
aa1b8cd4 | 2813 | if (fs_info->chunk_root->sectorsize != PAGE_SIZE) { |
b5d67f64 SB |
2814 | /* not supported for data w/o checksums */ |
2815 | printk(KERN_ERR | |
2816 | "btrfs_scrub: size assumption sectorsize != PAGE_SIZE (%d != %lld) fails\n", | |
aa1b8cd4 SB |
2817 | fs_info->chunk_root->sectorsize, |
2818 | (unsigned long long)PAGE_SIZE); | |
a2de733c AJ |
2819 | return -EINVAL; |
2820 | } | |
2821 | ||
7a9e9987 SB |
2822 | if (fs_info->chunk_root->nodesize > |
2823 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || | |
2824 | fs_info->chunk_root->sectorsize > | |
2825 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { | |
2826 | /* | |
2827 | * would exhaust the array bounds of pagev member in | |
2828 | * struct scrub_block | |
2829 | */ | |
2830 | pr_err("btrfs_scrub: size assumption nodesize and sectorsize <= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails\n", | |
2831 | fs_info->chunk_root->nodesize, | |
2832 | SCRUB_MAX_PAGES_PER_BLOCK, | |
2833 | fs_info->chunk_root->sectorsize, | |
2834 | SCRUB_MAX_PAGES_PER_BLOCK); | |
2835 | return -EINVAL; | |
2836 | } | |
2837 | ||
ff023aac | 2838 | ret = scrub_workers_get(fs_info, is_dev_replace); |
a2de733c AJ |
2839 | if (ret) |
2840 | return ret; | |
2841 | ||
aa1b8cd4 SB |
2842 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
2843 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); | |
63a212ab | 2844 | if (!dev || (dev->missing && !is_dev_replace)) { |
aa1b8cd4 SB |
2845 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
2846 | scrub_workers_put(fs_info); | |
a2de733c AJ |
2847 | return -ENODEV; |
2848 | } | |
2849 | mutex_lock(&fs_info->scrub_lock); | |
2850 | ||
63a212ab | 2851 | if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) { |
a2de733c | 2852 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 SB |
2853 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
2854 | scrub_workers_put(fs_info); | |
2855 | return -EIO; | |
a2de733c AJ |
2856 | } |
2857 | ||
8dabb742 SB |
2858 | btrfs_dev_replace_lock(&fs_info->dev_replace); |
2859 | if (dev->scrub_device || | |
2860 | (!is_dev_replace && | |
2861 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { | |
2862 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
a2de733c | 2863 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 SB |
2864 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
2865 | scrub_workers_put(fs_info); | |
a2de733c AJ |
2866 | return -EINPROGRESS; |
2867 | } | |
8dabb742 | 2868 | btrfs_dev_replace_unlock(&fs_info->dev_replace); |
63a212ab | 2869 | sctx = scrub_setup_ctx(dev, is_dev_replace); |
d9d181c1 | 2870 | if (IS_ERR(sctx)) { |
a2de733c | 2871 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 SB |
2872 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
2873 | scrub_workers_put(fs_info); | |
d9d181c1 | 2874 | return PTR_ERR(sctx); |
a2de733c | 2875 | } |
d9d181c1 SB |
2876 | sctx->readonly = readonly; |
2877 | dev->scrub_device = sctx; | |
a2de733c AJ |
2878 | |
2879 | atomic_inc(&fs_info->scrubs_running); | |
2880 | mutex_unlock(&fs_info->scrub_lock); | |
aa1b8cd4 | 2881 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 2882 | |
ff023aac SB |
2883 | if (!is_dev_replace) { |
2884 | down_read(&fs_info->scrub_super_lock); | |
2885 | ret = scrub_supers(sctx, dev); | |
2886 | up_read(&fs_info->scrub_super_lock); | |
2887 | } | |
a2de733c AJ |
2888 | |
2889 | if (!ret) | |
ff023aac SB |
2890 | ret = scrub_enumerate_chunks(sctx, dev, start, end, |
2891 | is_dev_replace); | |
a2de733c | 2892 | |
b6bfebc1 | 2893 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
2894 | atomic_dec(&fs_info->scrubs_running); |
2895 | wake_up(&fs_info->scrub_pause_wait); | |
2896 | ||
b6bfebc1 | 2897 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
0ef8e451 | 2898 | |
a2de733c | 2899 | if (progress) |
d9d181c1 | 2900 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
a2de733c AJ |
2901 | |
2902 | mutex_lock(&fs_info->scrub_lock); | |
2903 | dev->scrub_device = NULL; | |
2904 | mutex_unlock(&fs_info->scrub_lock); | |
2905 | ||
d9d181c1 | 2906 | scrub_free_ctx(sctx); |
aa1b8cd4 | 2907 | scrub_workers_put(fs_info); |
a2de733c AJ |
2908 | |
2909 | return ret; | |
2910 | } | |
2911 | ||
143bede5 | 2912 | void btrfs_scrub_pause(struct btrfs_root *root) |
a2de733c AJ |
2913 | { |
2914 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2915 | ||
2916 | mutex_lock(&fs_info->scrub_lock); | |
2917 | atomic_inc(&fs_info->scrub_pause_req); | |
2918 | while (atomic_read(&fs_info->scrubs_paused) != | |
2919 | atomic_read(&fs_info->scrubs_running)) { | |
2920 | mutex_unlock(&fs_info->scrub_lock); | |
2921 | wait_event(fs_info->scrub_pause_wait, | |
2922 | atomic_read(&fs_info->scrubs_paused) == | |
2923 | atomic_read(&fs_info->scrubs_running)); | |
2924 | mutex_lock(&fs_info->scrub_lock); | |
2925 | } | |
2926 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c AJ |
2927 | } |
2928 | ||
143bede5 | 2929 | void btrfs_scrub_continue(struct btrfs_root *root) |
a2de733c AJ |
2930 | { |
2931 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2932 | ||
2933 | atomic_dec(&fs_info->scrub_pause_req); | |
2934 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
2935 | } |
2936 | ||
143bede5 | 2937 | void btrfs_scrub_pause_super(struct btrfs_root *root) |
a2de733c AJ |
2938 | { |
2939 | down_write(&root->fs_info->scrub_super_lock); | |
a2de733c AJ |
2940 | } |
2941 | ||
143bede5 | 2942 | void btrfs_scrub_continue_super(struct btrfs_root *root) |
a2de733c AJ |
2943 | { |
2944 | up_write(&root->fs_info->scrub_super_lock); | |
a2de733c AJ |
2945 | } |
2946 | ||
aa1b8cd4 | 2947 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
a2de733c | 2948 | { |
a2de733c AJ |
2949 | mutex_lock(&fs_info->scrub_lock); |
2950 | if (!atomic_read(&fs_info->scrubs_running)) { | |
2951 | mutex_unlock(&fs_info->scrub_lock); | |
2952 | return -ENOTCONN; | |
2953 | } | |
2954 | ||
2955 | atomic_inc(&fs_info->scrub_cancel_req); | |
2956 | while (atomic_read(&fs_info->scrubs_running)) { | |
2957 | mutex_unlock(&fs_info->scrub_lock); | |
2958 | wait_event(fs_info->scrub_pause_wait, | |
2959 | atomic_read(&fs_info->scrubs_running) == 0); | |
2960 | mutex_lock(&fs_info->scrub_lock); | |
2961 | } | |
2962 | atomic_dec(&fs_info->scrub_cancel_req); | |
2963 | mutex_unlock(&fs_info->scrub_lock); | |
2964 | ||
2965 | return 0; | |
2966 | } | |
2967 | ||
aa1b8cd4 SB |
2968 | int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info, |
2969 | struct btrfs_device *dev) | |
49b25e05 | 2970 | { |
d9d181c1 | 2971 | struct scrub_ctx *sctx; |
a2de733c AJ |
2972 | |
2973 | mutex_lock(&fs_info->scrub_lock); | |
d9d181c1 SB |
2974 | sctx = dev->scrub_device; |
2975 | if (!sctx) { | |
a2de733c AJ |
2976 | mutex_unlock(&fs_info->scrub_lock); |
2977 | return -ENOTCONN; | |
2978 | } | |
d9d181c1 | 2979 | atomic_inc(&sctx->cancel_req); |
a2de733c AJ |
2980 | while (dev->scrub_device) { |
2981 | mutex_unlock(&fs_info->scrub_lock); | |
2982 | wait_event(fs_info->scrub_pause_wait, | |
2983 | dev->scrub_device == NULL); | |
2984 | mutex_lock(&fs_info->scrub_lock); | |
2985 | } | |
2986 | mutex_unlock(&fs_info->scrub_lock); | |
2987 | ||
2988 | return 0; | |
2989 | } | |
1623edeb | 2990 | |
a2de733c AJ |
2991 | int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid) |
2992 | { | |
2993 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2994 | struct btrfs_device *dev; | |
2995 | int ret; | |
2996 | ||
2997 | /* | |
2998 | * we have to hold the device_list_mutex here so the device | |
2999 | * does not go away in cancel_dev. FIXME: find a better solution | |
3000 | */ | |
3001 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
aa1b8cd4 | 3002 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); |
a2de733c AJ |
3003 | if (!dev) { |
3004 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
3005 | return -ENODEV; | |
3006 | } | |
aa1b8cd4 | 3007 | ret = btrfs_scrub_cancel_dev(fs_info, dev); |
a2de733c AJ |
3008 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
3009 | ||
3010 | return ret; | |
3011 | } | |
3012 | ||
3013 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, | |
3014 | struct btrfs_scrub_progress *progress) | |
3015 | { | |
3016 | struct btrfs_device *dev; | |
d9d181c1 | 3017 | struct scrub_ctx *sctx = NULL; |
a2de733c AJ |
3018 | |
3019 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
aa1b8cd4 | 3020 | dev = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
a2de733c | 3021 | if (dev) |
d9d181c1 SB |
3022 | sctx = dev->scrub_device; |
3023 | if (sctx) | |
3024 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
a2de733c AJ |
3025 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
3026 | ||
d9d181c1 | 3027 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
a2de733c | 3028 | } |
ff023aac SB |
3029 | |
3030 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
3031 | u64 extent_logical, u64 extent_len, | |
3032 | u64 *extent_physical, | |
3033 | struct btrfs_device **extent_dev, | |
3034 | int *extent_mirror_num) | |
3035 | { | |
3036 | u64 mapped_length; | |
3037 | struct btrfs_bio *bbio = NULL; | |
3038 | int ret; | |
3039 | ||
3040 | mapped_length = extent_len; | |
3041 | ret = btrfs_map_block(fs_info, READ, extent_logical, | |
3042 | &mapped_length, &bbio, 0); | |
3043 | if (ret || !bbio || mapped_length < extent_len || | |
3044 | !bbio->stripes[0].dev->bdev) { | |
3045 | kfree(bbio); | |
3046 | return; | |
3047 | } | |
3048 | ||
3049 | *extent_physical = bbio->stripes[0].physical; | |
3050 | *extent_mirror_num = bbio->mirror_num; | |
3051 | *extent_dev = bbio->stripes[0].dev; | |
3052 | kfree(bbio); | |
3053 | } | |
3054 | ||
3055 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
3056 | struct scrub_wr_ctx *wr_ctx, | |
3057 | struct btrfs_fs_info *fs_info, | |
3058 | struct btrfs_device *dev, | |
3059 | int is_dev_replace) | |
3060 | { | |
3061 | WARN_ON(wr_ctx->wr_curr_bio != NULL); | |
3062 | ||
3063 | mutex_init(&wr_ctx->wr_lock); | |
3064 | wr_ctx->wr_curr_bio = NULL; | |
3065 | if (!is_dev_replace) | |
3066 | return 0; | |
3067 | ||
3068 | WARN_ON(!dev->bdev); | |
3069 | wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO, | |
3070 | bio_get_nr_vecs(dev->bdev)); | |
3071 | wr_ctx->tgtdev = dev; | |
3072 | atomic_set(&wr_ctx->flush_all_writes, 0); | |
3073 | return 0; | |
3074 | } | |
3075 | ||
3076 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx) | |
3077 | { | |
3078 | mutex_lock(&wr_ctx->wr_lock); | |
3079 | kfree(wr_ctx->wr_curr_bio); | |
3080 | wr_ctx->wr_curr_bio = NULL; | |
3081 | mutex_unlock(&wr_ctx->wr_lock); | |
3082 | } | |
3083 | ||
3084 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, | |
3085 | int mirror_num, u64 physical_for_dev_replace) | |
3086 | { | |
3087 | struct scrub_copy_nocow_ctx *nocow_ctx; | |
3088 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
3089 | ||
3090 | nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS); | |
3091 | if (!nocow_ctx) { | |
3092 | spin_lock(&sctx->stat_lock); | |
3093 | sctx->stat.malloc_errors++; | |
3094 | spin_unlock(&sctx->stat_lock); | |
3095 | return -ENOMEM; | |
3096 | } | |
3097 | ||
3098 | scrub_pending_trans_workers_inc(sctx); | |
3099 | ||
3100 | nocow_ctx->sctx = sctx; | |
3101 | nocow_ctx->logical = logical; | |
3102 | nocow_ctx->len = len; | |
3103 | nocow_ctx->mirror_num = mirror_num; | |
3104 | nocow_ctx->physical_for_dev_replace = physical_for_dev_replace; | |
3105 | nocow_ctx->work.func = copy_nocow_pages_worker; | |
3106 | btrfs_queue_worker(&fs_info->scrub_nocow_workers, | |
3107 | &nocow_ctx->work); | |
3108 | ||
3109 | return 0; | |
3110 | } | |
3111 | ||
3112 | static void copy_nocow_pages_worker(struct btrfs_work *work) | |
3113 | { | |
3114 | struct scrub_copy_nocow_ctx *nocow_ctx = | |
3115 | container_of(work, struct scrub_copy_nocow_ctx, work); | |
3116 | struct scrub_ctx *sctx = nocow_ctx->sctx; | |
3117 | u64 logical = nocow_ctx->logical; | |
3118 | u64 len = nocow_ctx->len; | |
3119 | int mirror_num = nocow_ctx->mirror_num; | |
3120 | u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; | |
3121 | int ret; | |
3122 | struct btrfs_trans_handle *trans = NULL; | |
3123 | struct btrfs_fs_info *fs_info; | |
3124 | struct btrfs_path *path; | |
3125 | struct btrfs_root *root; | |
3126 | int not_written = 0; | |
3127 | ||
3128 | fs_info = sctx->dev_root->fs_info; | |
3129 | root = fs_info->extent_root; | |
3130 | ||
3131 | path = btrfs_alloc_path(); | |
3132 | if (!path) { | |
3133 | spin_lock(&sctx->stat_lock); | |
3134 | sctx->stat.malloc_errors++; | |
3135 | spin_unlock(&sctx->stat_lock); | |
3136 | not_written = 1; | |
3137 | goto out; | |
3138 | } | |
3139 | ||
3140 | trans = btrfs_join_transaction(root); | |
3141 | if (IS_ERR(trans)) { | |
3142 | not_written = 1; | |
3143 | goto out; | |
3144 | } | |
3145 | ||
3146 | ret = iterate_inodes_from_logical(logical, fs_info, path, | |
3147 | copy_nocow_pages_for_inode, | |
3148 | nocow_ctx); | |
3149 | if (ret != 0 && ret != -ENOENT) { | |
3150 | pr_warn("iterate_inodes_from_logical() failed: log %llu, phys %llu, len %llu, mir %llu, ret %d\n", | |
3151 | (unsigned long long)logical, | |
3152 | (unsigned long long)physical_for_dev_replace, | |
3153 | (unsigned long long)len, | |
3154 | (unsigned long long)mirror_num, ret); | |
3155 | not_written = 1; | |
3156 | goto out; | |
3157 | } | |
3158 | ||
3159 | out: | |
3160 | if (trans && !IS_ERR(trans)) | |
3161 | btrfs_end_transaction(trans, root); | |
3162 | if (not_written) | |
3163 | btrfs_dev_replace_stats_inc(&fs_info->dev_replace. | |
3164 | num_uncorrectable_read_errors); | |
3165 | ||
3166 | btrfs_free_path(path); | |
3167 | kfree(nocow_ctx); | |
3168 | ||
3169 | scrub_pending_trans_workers_dec(sctx); | |
3170 | } | |
3171 | ||
3172 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, void *ctx) | |
3173 | { | |
3174 | unsigned long index; | |
3175 | struct scrub_copy_nocow_ctx *nocow_ctx = ctx; | |
3176 | int ret = 0; | |
3177 | struct btrfs_key key; | |
3178 | struct inode *inode = NULL; | |
3179 | struct btrfs_root *local_root; | |
3180 | u64 physical_for_dev_replace; | |
3181 | u64 len; | |
3182 | struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info; | |
3183 | ||
3184 | key.objectid = root; | |
3185 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3186 | key.offset = (u64)-1; | |
3187 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
3188 | if (IS_ERR(local_root)) | |
3189 | return PTR_ERR(local_root); | |
3190 | ||
3191 | key.type = BTRFS_INODE_ITEM_KEY; | |
3192 | key.objectid = inum; | |
3193 | key.offset = 0; | |
3194 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); | |
3195 | if (IS_ERR(inode)) | |
3196 | return PTR_ERR(inode); | |
3197 | ||
3198 | physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; | |
3199 | len = nocow_ctx->len; | |
3200 | while (len >= PAGE_CACHE_SIZE) { | |
3201 | struct page *page = NULL; | |
3202 | int ret_sub; | |
3203 | ||
3204 | index = offset >> PAGE_CACHE_SHIFT; | |
3205 | ||
3206 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
3207 | if (!page) { | |
3208 | pr_err("find_or_create_page() failed\n"); | |
3209 | ret = -ENOMEM; | |
3210 | goto next_page; | |
3211 | } | |
3212 | ||
3213 | if (PageUptodate(page)) { | |
3214 | if (PageDirty(page)) | |
3215 | goto next_page; | |
3216 | } else { | |
3217 | ClearPageError(page); | |
3218 | ret_sub = extent_read_full_page(&BTRFS_I(inode)-> | |
3219 | io_tree, | |
3220 | page, btrfs_get_extent, | |
3221 | nocow_ctx->mirror_num); | |
3222 | if (ret_sub) { | |
3223 | ret = ret_sub; | |
3224 | goto next_page; | |
3225 | } | |
3226 | wait_on_page_locked(page); | |
3227 | if (!PageUptodate(page)) { | |
3228 | ret = -EIO; | |
3229 | goto next_page; | |
3230 | } | |
3231 | } | |
3232 | ret_sub = write_page_nocow(nocow_ctx->sctx, | |
3233 | physical_for_dev_replace, page); | |
3234 | if (ret_sub) { | |
3235 | ret = ret_sub; | |
3236 | goto next_page; | |
3237 | } | |
3238 | ||
3239 | next_page: | |
3240 | if (page) { | |
3241 | unlock_page(page); | |
3242 | put_page(page); | |
3243 | } | |
3244 | offset += PAGE_CACHE_SIZE; | |
3245 | physical_for_dev_replace += PAGE_CACHE_SIZE; | |
3246 | len -= PAGE_CACHE_SIZE; | |
3247 | } | |
3248 | ||
3249 | if (inode) | |
3250 | iput(inode); | |
3251 | return ret; | |
3252 | } | |
3253 | ||
3254 | static int write_page_nocow(struct scrub_ctx *sctx, | |
3255 | u64 physical_for_dev_replace, struct page *page) | |
3256 | { | |
3257 | struct bio *bio; | |
3258 | struct btrfs_device *dev; | |
3259 | int ret; | |
3260 | DECLARE_COMPLETION_ONSTACK(compl); | |
3261 | ||
3262 | dev = sctx->wr_ctx.tgtdev; | |
3263 | if (!dev) | |
3264 | return -EIO; | |
3265 | if (!dev->bdev) { | |
3266 | printk_ratelimited(KERN_WARNING | |
3267 | "btrfs: scrub write_page_nocow(bdev == NULL) is unexpected!\n"); | |
3268 | return -EIO; | |
3269 | } | |
3270 | bio = bio_alloc(GFP_NOFS, 1); | |
3271 | if (!bio) { | |
3272 | spin_lock(&sctx->stat_lock); | |
3273 | sctx->stat.malloc_errors++; | |
3274 | spin_unlock(&sctx->stat_lock); | |
3275 | return -ENOMEM; | |
3276 | } | |
3277 | bio->bi_private = &compl; | |
3278 | bio->bi_end_io = scrub_complete_bio_end_io; | |
3279 | bio->bi_size = 0; | |
3280 | bio->bi_sector = physical_for_dev_replace >> 9; | |
3281 | bio->bi_bdev = dev->bdev; | |
3282 | ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); | |
3283 | if (ret != PAGE_CACHE_SIZE) { | |
3284 | leave_with_eio: | |
3285 | bio_put(bio); | |
3286 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); | |
3287 | return -EIO; | |
3288 | } | |
3289 | btrfsic_submit_bio(WRITE_SYNC, bio); | |
3290 | wait_for_completion(&compl); | |
3291 | ||
3292 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
3293 | goto leave_with_eio; | |
3294 | ||
3295 | bio_put(bio); | |
3296 | return 0; | |
3297 | } |