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; |
6f1c3605 | 583 | struct btrfs_fs_info *fs_info; |
0ef8e451 JS |
584 | u64 end = offset + PAGE_SIZE - 1; |
585 | struct btrfs_root *local_root; | |
6f1c3605 | 586 | int srcu_index; |
0ef8e451 JS |
587 | |
588 | key.objectid = root; | |
589 | key.type = BTRFS_ROOT_ITEM_KEY; | |
590 | key.offset = (u64)-1; | |
6f1c3605 LB |
591 | |
592 | fs_info = fixup->root->fs_info; | |
593 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
594 | ||
595 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
596 | if (IS_ERR(local_root)) { | |
597 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 | 598 | return PTR_ERR(local_root); |
6f1c3605 | 599 | } |
0ef8e451 JS |
600 | |
601 | key.type = BTRFS_INODE_ITEM_KEY; | |
602 | key.objectid = inum; | |
603 | key.offset = 0; | |
6f1c3605 LB |
604 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); |
605 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
0ef8e451 JS |
606 | if (IS_ERR(inode)) |
607 | return PTR_ERR(inode); | |
608 | ||
0ef8e451 JS |
609 | index = offset >> PAGE_CACHE_SHIFT; |
610 | ||
611 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
5da6fcbc JS |
612 | if (!page) { |
613 | ret = -ENOMEM; | |
614 | goto out; | |
615 | } | |
616 | ||
617 | if (PageUptodate(page)) { | |
5da6fcbc JS |
618 | if (PageDirty(page)) { |
619 | /* | |
620 | * we need to write the data to the defect sector. the | |
621 | * data that was in that sector is not in memory, | |
622 | * because the page was modified. we must not write the | |
623 | * modified page to that sector. | |
624 | * | |
625 | * TODO: what could be done here: wait for the delalloc | |
626 | * runner to write out that page (might involve | |
627 | * COW) and see whether the sector is still | |
628 | * referenced afterwards. | |
629 | * | |
630 | * For the meantime, we'll treat this error | |
631 | * incorrectable, although there is a chance that a | |
632 | * later scrub will find the bad sector again and that | |
633 | * there's no dirty page in memory, then. | |
634 | */ | |
635 | ret = -EIO; | |
636 | goto out; | |
637 | } | |
3ec706c8 SB |
638 | fs_info = BTRFS_I(inode)->root->fs_info; |
639 | ret = repair_io_failure(fs_info, offset, PAGE_SIZE, | |
5da6fcbc JS |
640 | fixup->logical, page, |
641 | fixup->mirror_num); | |
642 | unlock_page(page); | |
643 | corrected = !ret; | |
644 | } else { | |
645 | /* | |
646 | * we need to get good data first. the general readpage path | |
647 | * will call repair_io_failure for us, we just have to make | |
648 | * sure we read the bad mirror. | |
649 | */ | |
650 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
651 | EXTENT_DAMAGED, GFP_NOFS); | |
652 | if (ret) { | |
653 | /* set_extent_bits should give proper error */ | |
654 | WARN_ON(ret > 0); | |
655 | if (ret > 0) | |
656 | ret = -EFAULT; | |
657 | goto out; | |
658 | } | |
659 | ||
660 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, | |
661 | btrfs_get_extent, | |
662 | fixup->mirror_num); | |
663 | wait_on_page_locked(page); | |
664 | ||
665 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, | |
666 | end, EXTENT_DAMAGED, 0, NULL); | |
667 | if (!corrected) | |
668 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, | |
669 | EXTENT_DAMAGED, GFP_NOFS); | |
670 | } | |
671 | ||
672 | out: | |
673 | if (page) | |
674 | put_page(page); | |
675 | if (inode) | |
676 | iput(inode); | |
0ef8e451 JS |
677 | |
678 | if (ret < 0) | |
679 | return ret; | |
680 | ||
681 | if (ret == 0 && corrected) { | |
682 | /* | |
683 | * we only need to call readpage for one of the inodes belonging | |
684 | * to this extent. so make iterate_extent_inodes stop | |
685 | */ | |
686 | return 1; | |
687 | } | |
688 | ||
689 | return -EIO; | |
690 | } | |
691 | ||
692 | static void scrub_fixup_nodatasum(struct btrfs_work *work) | |
693 | { | |
694 | int ret; | |
695 | struct scrub_fixup_nodatasum *fixup; | |
d9d181c1 | 696 | struct scrub_ctx *sctx; |
0ef8e451 JS |
697 | struct btrfs_trans_handle *trans = NULL; |
698 | struct btrfs_fs_info *fs_info; | |
699 | struct btrfs_path *path; | |
700 | int uncorrectable = 0; | |
701 | ||
702 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); | |
d9d181c1 | 703 | sctx = fixup->sctx; |
0ef8e451 JS |
704 | fs_info = fixup->root->fs_info; |
705 | ||
706 | path = btrfs_alloc_path(); | |
707 | if (!path) { | |
d9d181c1 SB |
708 | spin_lock(&sctx->stat_lock); |
709 | ++sctx->stat.malloc_errors; | |
710 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
711 | uncorrectable = 1; |
712 | goto out; | |
713 | } | |
714 | ||
715 | trans = btrfs_join_transaction(fixup->root); | |
716 | if (IS_ERR(trans)) { | |
717 | uncorrectable = 1; | |
718 | goto out; | |
719 | } | |
720 | ||
721 | /* | |
722 | * the idea is to trigger a regular read through the standard path. we | |
723 | * read a page from the (failed) logical address by specifying the | |
724 | * corresponding copynum of the failed sector. thus, that readpage is | |
725 | * expected to fail. | |
726 | * that is the point where on-the-fly error correction will kick in | |
727 | * (once it's finished) and rewrite the failed sector if a good copy | |
728 | * can be found. | |
729 | */ | |
730 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, | |
731 | path, scrub_fixup_readpage, | |
732 | fixup); | |
733 | if (ret < 0) { | |
734 | uncorrectable = 1; | |
735 | goto out; | |
736 | } | |
737 | WARN_ON(ret != 1); | |
738 | ||
d9d181c1 SB |
739 | spin_lock(&sctx->stat_lock); |
740 | ++sctx->stat.corrected_errors; | |
741 | spin_unlock(&sctx->stat_lock); | |
0ef8e451 JS |
742 | |
743 | out: | |
744 | if (trans && !IS_ERR(trans)) | |
745 | btrfs_end_transaction(trans, fixup->root); | |
746 | if (uncorrectable) { | |
d9d181c1 SB |
747 | spin_lock(&sctx->stat_lock); |
748 | ++sctx->stat.uncorrectable_errors; | |
749 | spin_unlock(&sctx->stat_lock); | |
ff023aac SB |
750 | btrfs_dev_replace_stats_inc( |
751 | &sctx->dev_root->fs_info->dev_replace. | |
752 | num_uncorrectable_read_errors); | |
606686ee | 753 | printk_ratelimited_in_rcu(KERN_ERR |
b5d67f64 | 754 | "btrfs: unable to fixup (nodatasum) error at logical %llu on dev %s\n", |
606686ee | 755 | (unsigned long long)fixup->logical, |
a36cf8b8 | 756 | rcu_str_deref(fixup->dev->name)); |
0ef8e451 JS |
757 | } |
758 | ||
759 | btrfs_free_path(path); | |
760 | kfree(fixup); | |
761 | ||
b6bfebc1 | 762 | scrub_pending_trans_workers_dec(sctx); |
0ef8e451 JS |
763 | } |
764 | ||
a2de733c | 765 | /* |
b5d67f64 SB |
766 | * scrub_handle_errored_block gets called when either verification of the |
767 | * pages failed or the bio failed to read, e.g. with EIO. In the latter | |
768 | * case, this function handles all pages in the bio, even though only one | |
769 | * may be bad. | |
770 | * The goal of this function is to repair the errored block by using the | |
771 | * contents of one of the mirrors. | |
a2de733c | 772 | */ |
b5d67f64 | 773 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
a2de733c | 774 | { |
d9d181c1 | 775 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
a36cf8b8 | 776 | struct btrfs_device *dev; |
b5d67f64 SB |
777 | struct btrfs_fs_info *fs_info; |
778 | u64 length; | |
779 | u64 logical; | |
780 | u64 generation; | |
781 | unsigned int failed_mirror_index; | |
782 | unsigned int is_metadata; | |
783 | unsigned int have_csum; | |
784 | u8 *csum; | |
785 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ | |
786 | struct scrub_block *sblock_bad; | |
787 | int ret; | |
788 | int mirror_index; | |
789 | int page_num; | |
790 | int success; | |
558540c1 | 791 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
b5d67f64 SB |
792 | DEFAULT_RATELIMIT_BURST); |
793 | ||
794 | BUG_ON(sblock_to_check->page_count < 1); | |
a36cf8b8 | 795 | fs_info = sctx->dev_root->fs_info; |
4ded4f63 SB |
796 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
797 | /* | |
798 | * if we find an error in a super block, we just report it. | |
799 | * They will get written with the next transaction commit | |
800 | * anyway | |
801 | */ | |
802 | spin_lock(&sctx->stat_lock); | |
803 | ++sctx->stat.super_errors; | |
804 | spin_unlock(&sctx->stat_lock); | |
805 | return 0; | |
806 | } | |
b5d67f64 | 807 | length = sblock_to_check->page_count * PAGE_SIZE; |
7a9e9987 SB |
808 | logical = sblock_to_check->pagev[0]->logical; |
809 | generation = sblock_to_check->pagev[0]->generation; | |
810 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); | |
811 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; | |
812 | is_metadata = !(sblock_to_check->pagev[0]->flags & | |
b5d67f64 | 813 | BTRFS_EXTENT_FLAG_DATA); |
7a9e9987 SB |
814 | have_csum = sblock_to_check->pagev[0]->have_csum; |
815 | csum = sblock_to_check->pagev[0]->csum; | |
816 | dev = sblock_to_check->pagev[0]->dev; | |
13db62b7 | 817 | |
ff023aac SB |
818 | if (sctx->is_dev_replace && !is_metadata && !have_csum) { |
819 | sblocks_for_recheck = NULL; | |
820 | goto nodatasum_case; | |
821 | } | |
822 | ||
b5d67f64 SB |
823 | /* |
824 | * read all mirrors one after the other. This includes to | |
825 | * re-read the extent or metadata block that failed (that was | |
826 | * the cause that this fixup code is called) another time, | |
827 | * page by page this time in order to know which pages | |
828 | * caused I/O errors and which ones are good (for all mirrors). | |
829 | * It is the goal to handle the situation when more than one | |
830 | * mirror contains I/O errors, but the errors do not | |
831 | * overlap, i.e. the data can be repaired by selecting the | |
832 | * pages from those mirrors without I/O error on the | |
833 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) | |
834 | * would be that mirror #1 has an I/O error on the first page, | |
835 | * the second page is good, and mirror #2 has an I/O error on | |
836 | * the second page, but the first page is good. | |
837 | * Then the first page of the first mirror can be repaired by | |
838 | * taking the first page of the second mirror, and the | |
839 | * second page of the second mirror can be repaired by | |
840 | * copying the contents of the 2nd page of the 1st mirror. | |
841 | * One more note: if the pages of one mirror contain I/O | |
842 | * errors, the checksum cannot be verified. In order to get | |
843 | * the best data for repairing, the first attempt is to find | |
844 | * a mirror without I/O errors and with a validated checksum. | |
845 | * Only if this is not possible, the pages are picked from | |
846 | * mirrors with I/O errors without considering the checksum. | |
847 | * If the latter is the case, at the end, the checksum of the | |
848 | * repaired area is verified in order to correctly maintain | |
849 | * the statistics. | |
850 | */ | |
851 | ||
852 | sblocks_for_recheck = kzalloc(BTRFS_MAX_MIRRORS * | |
853 | sizeof(*sblocks_for_recheck), | |
854 | GFP_NOFS); | |
855 | if (!sblocks_for_recheck) { | |
d9d181c1 SB |
856 | spin_lock(&sctx->stat_lock); |
857 | sctx->stat.malloc_errors++; | |
858 | sctx->stat.read_errors++; | |
859 | sctx->stat.uncorrectable_errors++; | |
860 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 861 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 862 | goto out; |
a2de733c AJ |
863 | } |
864 | ||
b5d67f64 | 865 | /* setup the context, map the logical blocks and alloc the pages */ |
ff023aac | 866 | ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length, |
b5d67f64 SB |
867 | logical, sblocks_for_recheck); |
868 | if (ret) { | |
d9d181c1 SB |
869 | spin_lock(&sctx->stat_lock); |
870 | sctx->stat.read_errors++; | |
871 | sctx->stat.uncorrectable_errors++; | |
872 | spin_unlock(&sctx->stat_lock); | |
a36cf8b8 | 873 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 SB |
874 | goto out; |
875 | } | |
876 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); | |
877 | sblock_bad = sblocks_for_recheck + failed_mirror_index; | |
13db62b7 | 878 | |
b5d67f64 | 879 | /* build and submit the bios for the failed mirror, check checksums */ |
34f5c8e9 SB |
880 | scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum, |
881 | csum, generation, sctx->csum_size); | |
a2de733c | 882 | |
b5d67f64 SB |
883 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
884 | sblock_bad->no_io_error_seen) { | |
885 | /* | |
886 | * the error disappeared after reading page by page, or | |
887 | * the area was part of a huge bio and other parts of the | |
888 | * bio caused I/O errors, or the block layer merged several | |
889 | * read requests into one and the error is caused by a | |
890 | * different bio (usually one of the two latter cases is | |
891 | * the cause) | |
892 | */ | |
d9d181c1 SB |
893 | spin_lock(&sctx->stat_lock); |
894 | sctx->stat.unverified_errors++; | |
895 | spin_unlock(&sctx->stat_lock); | |
a2de733c | 896 | |
ff023aac SB |
897 | if (sctx->is_dev_replace) |
898 | scrub_write_block_to_dev_replace(sblock_bad); | |
b5d67f64 | 899 | goto out; |
a2de733c | 900 | } |
a2de733c | 901 | |
b5d67f64 | 902 | if (!sblock_bad->no_io_error_seen) { |
d9d181c1 SB |
903 | spin_lock(&sctx->stat_lock); |
904 | sctx->stat.read_errors++; | |
905 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
906 | if (__ratelimit(&_rs)) |
907 | scrub_print_warning("i/o error", sblock_to_check); | |
a36cf8b8 | 908 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
b5d67f64 | 909 | } else if (sblock_bad->checksum_error) { |
d9d181c1 SB |
910 | spin_lock(&sctx->stat_lock); |
911 | sctx->stat.csum_errors++; | |
912 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
913 | if (__ratelimit(&_rs)) |
914 | scrub_print_warning("checksum error", sblock_to_check); | |
a36cf8b8 | 915 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 916 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 917 | } else if (sblock_bad->header_error) { |
d9d181c1 SB |
918 | spin_lock(&sctx->stat_lock); |
919 | sctx->stat.verify_errors++; | |
920 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 SB |
921 | if (__ratelimit(&_rs)) |
922 | scrub_print_warning("checksum/header error", | |
923 | sblock_to_check); | |
442a4f63 | 924 | if (sblock_bad->generation_error) |
a36cf8b8 | 925 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 SB |
926 | BTRFS_DEV_STAT_GENERATION_ERRS); |
927 | else | |
a36cf8b8 | 928 | btrfs_dev_stat_inc_and_print(dev, |
442a4f63 | 929 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
b5d67f64 | 930 | } |
a2de733c | 931 | |
ff023aac | 932 | if (sctx->readonly && !sctx->is_dev_replace) |
b5d67f64 | 933 | goto did_not_correct_error; |
a2de733c | 934 | |
b5d67f64 SB |
935 | if (!is_metadata && !have_csum) { |
936 | struct scrub_fixup_nodatasum *fixup_nodatasum; | |
a2de733c | 937 | |
ff023aac SB |
938 | nodatasum_case: |
939 | WARN_ON(sctx->is_dev_replace); | |
940 | ||
b5d67f64 SB |
941 | /* |
942 | * !is_metadata and !have_csum, this means that the data | |
943 | * might not be COW'ed, that it might be modified | |
944 | * concurrently. The general strategy to work on the | |
945 | * commit root does not help in the case when COW is not | |
946 | * used. | |
947 | */ | |
948 | fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS); | |
949 | if (!fixup_nodatasum) | |
950 | goto did_not_correct_error; | |
d9d181c1 | 951 | fixup_nodatasum->sctx = sctx; |
a36cf8b8 | 952 | fixup_nodatasum->dev = dev; |
b5d67f64 SB |
953 | fixup_nodatasum->logical = logical; |
954 | fixup_nodatasum->root = fs_info->extent_root; | |
955 | fixup_nodatasum->mirror_num = failed_mirror_index + 1; | |
b6bfebc1 | 956 | scrub_pending_trans_workers_inc(sctx); |
b5d67f64 SB |
957 | fixup_nodatasum->work.func = scrub_fixup_nodatasum; |
958 | btrfs_queue_worker(&fs_info->scrub_workers, | |
959 | &fixup_nodatasum->work); | |
960 | goto out; | |
a2de733c AJ |
961 | } |
962 | ||
b5d67f64 SB |
963 | /* |
964 | * now build and submit the bios for the other mirrors, check | |
cb2ced73 SB |
965 | * checksums. |
966 | * First try to pick the mirror which is completely without I/O | |
b5d67f64 SB |
967 | * errors and also does not have a checksum error. |
968 | * If one is found, and if a checksum is present, the full block | |
969 | * that is known to contain an error is rewritten. Afterwards | |
970 | * the block is known to be corrected. | |
971 | * If a mirror is found which is completely correct, and no | |
972 | * checksum is present, only those pages are rewritten that had | |
973 | * an I/O error in the block to be repaired, since it cannot be | |
974 | * determined, which copy of the other pages is better (and it | |
975 | * could happen otherwise that a correct page would be | |
976 | * overwritten by a bad one). | |
977 | */ | |
978 | for (mirror_index = 0; | |
979 | mirror_index < BTRFS_MAX_MIRRORS && | |
980 | sblocks_for_recheck[mirror_index].page_count > 0; | |
981 | mirror_index++) { | |
cb2ced73 | 982 | struct scrub_block *sblock_other; |
b5d67f64 | 983 | |
cb2ced73 SB |
984 | if (mirror_index == failed_mirror_index) |
985 | continue; | |
986 | sblock_other = sblocks_for_recheck + mirror_index; | |
987 | ||
988 | /* build and submit the bios, check checksums */ | |
34f5c8e9 SB |
989 | scrub_recheck_block(fs_info, sblock_other, is_metadata, |
990 | have_csum, csum, generation, | |
991 | sctx->csum_size); | |
992 | ||
993 | if (!sblock_other->header_error && | |
b5d67f64 SB |
994 | !sblock_other->checksum_error && |
995 | sblock_other->no_io_error_seen) { | |
ff023aac SB |
996 | if (sctx->is_dev_replace) { |
997 | scrub_write_block_to_dev_replace(sblock_other); | |
998 | } else { | |
999 | int force_write = is_metadata || have_csum; | |
1000 | ||
1001 | ret = scrub_repair_block_from_good_copy( | |
1002 | sblock_bad, sblock_other, | |
1003 | force_write); | |
1004 | } | |
b5d67f64 SB |
1005 | if (0 == ret) |
1006 | goto corrected_error; | |
1007 | } | |
1008 | } | |
a2de733c AJ |
1009 | |
1010 | /* | |
ff023aac SB |
1011 | * for dev_replace, pick good pages and write to the target device. |
1012 | */ | |
1013 | if (sctx->is_dev_replace) { | |
1014 | success = 1; | |
1015 | for (page_num = 0; page_num < sblock_bad->page_count; | |
1016 | page_num++) { | |
1017 | int sub_success; | |
1018 | ||
1019 | sub_success = 0; | |
1020 | for (mirror_index = 0; | |
1021 | mirror_index < BTRFS_MAX_MIRRORS && | |
1022 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1023 | mirror_index++) { | |
1024 | struct scrub_block *sblock_other = | |
1025 | sblocks_for_recheck + mirror_index; | |
1026 | struct scrub_page *page_other = | |
1027 | sblock_other->pagev[page_num]; | |
1028 | ||
1029 | if (!page_other->io_error) { | |
1030 | ret = scrub_write_page_to_dev_replace( | |
1031 | sblock_other, page_num); | |
1032 | if (ret == 0) { | |
1033 | /* succeeded for this page */ | |
1034 | sub_success = 1; | |
1035 | break; | |
1036 | } else { | |
1037 | btrfs_dev_replace_stats_inc( | |
1038 | &sctx->dev_root-> | |
1039 | fs_info->dev_replace. | |
1040 | num_write_errors); | |
1041 | } | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | if (!sub_success) { | |
1046 | /* | |
1047 | * did not find a mirror to fetch the page | |
1048 | * from. scrub_write_page_to_dev_replace() | |
1049 | * handles this case (page->io_error), by | |
1050 | * filling the block with zeros before | |
1051 | * submitting the write request | |
1052 | */ | |
1053 | success = 0; | |
1054 | ret = scrub_write_page_to_dev_replace( | |
1055 | sblock_bad, page_num); | |
1056 | if (ret) | |
1057 | btrfs_dev_replace_stats_inc( | |
1058 | &sctx->dev_root->fs_info-> | |
1059 | dev_replace.num_write_errors); | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | goto out; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * for regular scrub, repair those pages that are errored. | |
1068 | * In case of I/O errors in the area that is supposed to be | |
b5d67f64 SB |
1069 | * repaired, continue by picking good copies of those pages. |
1070 | * Select the good pages from mirrors to rewrite bad pages from | |
1071 | * the area to fix. Afterwards verify the checksum of the block | |
1072 | * that is supposed to be repaired. This verification step is | |
1073 | * only done for the purpose of statistic counting and for the | |
1074 | * final scrub report, whether errors remain. | |
1075 | * A perfect algorithm could make use of the checksum and try | |
1076 | * all possible combinations of pages from the different mirrors | |
1077 | * until the checksum verification succeeds. For example, when | |
1078 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page | |
1079 | * of mirror #2 is readable but the final checksum test fails, | |
1080 | * then the 2nd page of mirror #3 could be tried, whether now | |
1081 | * the final checksum succeedes. But this would be a rare | |
1082 | * exception and is therefore not implemented. At least it is | |
1083 | * avoided that the good copy is overwritten. | |
1084 | * A more useful improvement would be to pick the sectors | |
1085 | * without I/O error based on sector sizes (512 bytes on legacy | |
1086 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one | |
1087 | * mirror could be repaired by taking 512 byte of a different | |
1088 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE | |
1089 | * area are unreadable. | |
a2de733c | 1090 | */ |
a2de733c | 1091 | |
b5d67f64 SB |
1092 | /* can only fix I/O errors from here on */ |
1093 | if (sblock_bad->no_io_error_seen) | |
1094 | goto did_not_correct_error; | |
1095 | ||
1096 | success = 1; | |
1097 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { | |
7a9e9987 | 1098 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
b5d67f64 SB |
1099 | |
1100 | if (!page_bad->io_error) | |
a2de733c | 1101 | continue; |
b5d67f64 SB |
1102 | |
1103 | for (mirror_index = 0; | |
1104 | mirror_index < BTRFS_MAX_MIRRORS && | |
1105 | sblocks_for_recheck[mirror_index].page_count > 0; | |
1106 | mirror_index++) { | |
1107 | struct scrub_block *sblock_other = sblocks_for_recheck + | |
1108 | mirror_index; | |
7a9e9987 SB |
1109 | struct scrub_page *page_other = sblock_other->pagev[ |
1110 | page_num]; | |
b5d67f64 SB |
1111 | |
1112 | if (!page_other->io_error) { | |
1113 | ret = scrub_repair_page_from_good_copy( | |
1114 | sblock_bad, sblock_other, page_num, 0); | |
1115 | if (0 == ret) { | |
1116 | page_bad->io_error = 0; | |
1117 | break; /* succeeded for this page */ | |
1118 | } | |
1119 | } | |
96e36920 | 1120 | } |
a2de733c | 1121 | |
b5d67f64 SB |
1122 | if (page_bad->io_error) { |
1123 | /* did not find a mirror to copy the page from */ | |
1124 | success = 0; | |
1125 | } | |
a2de733c | 1126 | } |
a2de733c | 1127 | |
b5d67f64 SB |
1128 | if (success) { |
1129 | if (is_metadata || have_csum) { | |
1130 | /* | |
1131 | * need to verify the checksum now that all | |
1132 | * sectors on disk are repaired (the write | |
1133 | * request for data to be repaired is on its way). | |
1134 | * Just be lazy and use scrub_recheck_block() | |
1135 | * which re-reads the data before the checksum | |
1136 | * is verified, but most likely the data comes out | |
1137 | * of the page cache. | |
1138 | */ | |
34f5c8e9 SB |
1139 | scrub_recheck_block(fs_info, sblock_bad, |
1140 | is_metadata, have_csum, csum, | |
1141 | generation, sctx->csum_size); | |
1142 | if (!sblock_bad->header_error && | |
b5d67f64 SB |
1143 | !sblock_bad->checksum_error && |
1144 | sblock_bad->no_io_error_seen) | |
1145 | goto corrected_error; | |
1146 | else | |
1147 | goto did_not_correct_error; | |
1148 | } else { | |
1149 | corrected_error: | |
d9d181c1 SB |
1150 | spin_lock(&sctx->stat_lock); |
1151 | sctx->stat.corrected_errors++; | |
1152 | spin_unlock(&sctx->stat_lock); | |
606686ee | 1153 | printk_ratelimited_in_rcu(KERN_ERR |
b5d67f64 | 1154 | "btrfs: fixed up error at logical %llu on dev %s\n", |
606686ee | 1155 | (unsigned long long)logical, |
a36cf8b8 | 1156 | rcu_str_deref(dev->name)); |
8628764e | 1157 | } |
b5d67f64 SB |
1158 | } else { |
1159 | did_not_correct_error: | |
d9d181c1 SB |
1160 | spin_lock(&sctx->stat_lock); |
1161 | sctx->stat.uncorrectable_errors++; | |
1162 | spin_unlock(&sctx->stat_lock); | |
606686ee | 1163 | printk_ratelimited_in_rcu(KERN_ERR |
b5d67f64 | 1164 | "btrfs: unable to fixup (regular) error at logical %llu on dev %s\n", |
606686ee | 1165 | (unsigned long long)logical, |
a36cf8b8 | 1166 | rcu_str_deref(dev->name)); |
96e36920 | 1167 | } |
a2de733c | 1168 | |
b5d67f64 SB |
1169 | out: |
1170 | if (sblocks_for_recheck) { | |
1171 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; | |
1172 | mirror_index++) { | |
1173 | struct scrub_block *sblock = sblocks_for_recheck + | |
1174 | mirror_index; | |
1175 | int page_index; | |
1176 | ||
7a9e9987 SB |
1177 | for (page_index = 0; page_index < sblock->page_count; |
1178 | page_index++) { | |
1179 | sblock->pagev[page_index]->sblock = NULL; | |
1180 | scrub_page_put(sblock->pagev[page_index]); | |
1181 | } | |
b5d67f64 SB |
1182 | } |
1183 | kfree(sblocks_for_recheck); | |
1184 | } | |
a2de733c | 1185 | |
b5d67f64 SB |
1186 | return 0; |
1187 | } | |
a2de733c | 1188 | |
d9d181c1 | 1189 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
3ec706c8 | 1190 | struct btrfs_fs_info *fs_info, |
ff023aac | 1191 | struct scrub_block *original_sblock, |
b5d67f64 SB |
1192 | u64 length, u64 logical, |
1193 | struct scrub_block *sblocks_for_recheck) | |
1194 | { | |
1195 | int page_index; | |
1196 | int mirror_index; | |
1197 | int ret; | |
1198 | ||
1199 | /* | |
7a9e9987 | 1200 | * note: the two members ref_count and outstanding_pages |
b5d67f64 SB |
1201 | * are not used (and not set) in the blocks that are used for |
1202 | * the recheck procedure | |
1203 | */ | |
1204 | ||
1205 | page_index = 0; | |
1206 | while (length > 0) { | |
1207 | u64 sublen = min_t(u64, length, PAGE_SIZE); | |
1208 | u64 mapped_length = sublen; | |
1209 | struct btrfs_bio *bbio = NULL; | |
a2de733c | 1210 | |
b5d67f64 SB |
1211 | /* |
1212 | * with a length of PAGE_SIZE, each returned stripe | |
1213 | * represents one mirror | |
1214 | */ | |
29a8d9a0 SB |
1215 | ret = btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS, logical, |
1216 | &mapped_length, &bbio, 0); | |
b5d67f64 SB |
1217 | if (ret || !bbio || mapped_length < sublen) { |
1218 | kfree(bbio); | |
1219 | return -EIO; | |
1220 | } | |
a2de733c | 1221 | |
ff023aac | 1222 | BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
1223 | for (mirror_index = 0; mirror_index < (int)bbio->num_stripes; |
1224 | mirror_index++) { | |
1225 | struct scrub_block *sblock; | |
1226 | struct scrub_page *page; | |
1227 | ||
1228 | if (mirror_index >= BTRFS_MAX_MIRRORS) | |
1229 | continue; | |
1230 | ||
1231 | sblock = sblocks_for_recheck + mirror_index; | |
7a9e9987 SB |
1232 | sblock->sctx = sctx; |
1233 | page = kzalloc(sizeof(*page), GFP_NOFS); | |
1234 | if (!page) { | |
1235 | leave_nomem: | |
d9d181c1 SB |
1236 | spin_lock(&sctx->stat_lock); |
1237 | sctx->stat.malloc_errors++; | |
1238 | spin_unlock(&sctx->stat_lock); | |
cf93dcce | 1239 | kfree(bbio); |
b5d67f64 SB |
1240 | return -ENOMEM; |
1241 | } | |
7a9e9987 SB |
1242 | scrub_page_get(page); |
1243 | sblock->pagev[page_index] = page; | |
1244 | page->logical = logical; | |
1245 | page->physical = bbio->stripes[mirror_index].physical; | |
ff023aac SB |
1246 | BUG_ON(page_index >= original_sblock->page_count); |
1247 | page->physical_for_dev_replace = | |
1248 | original_sblock->pagev[page_index]-> | |
1249 | physical_for_dev_replace; | |
7a9e9987 SB |
1250 | /* for missing devices, dev->bdev is NULL */ |
1251 | page->dev = bbio->stripes[mirror_index].dev; | |
1252 | page->mirror_num = mirror_index + 1; | |
b5d67f64 | 1253 | sblock->page_count++; |
7a9e9987 SB |
1254 | page->page = alloc_page(GFP_NOFS); |
1255 | if (!page->page) | |
1256 | goto leave_nomem; | |
b5d67f64 SB |
1257 | } |
1258 | kfree(bbio); | |
1259 | length -= sublen; | |
1260 | logical += sublen; | |
1261 | page_index++; | |
1262 | } | |
1263 | ||
1264 | return 0; | |
96e36920 ID |
1265 | } |
1266 | ||
b5d67f64 SB |
1267 | /* |
1268 | * this function will check the on disk data for checksum errors, header | |
1269 | * errors and read I/O errors. If any I/O errors happen, the exact pages | |
1270 | * which are errored are marked as being bad. The goal is to enable scrub | |
1271 | * to take those pages that are not errored from all the mirrors so that | |
1272 | * the pages that are errored in the just handled mirror can be repaired. | |
1273 | */ | |
34f5c8e9 SB |
1274 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
1275 | struct scrub_block *sblock, int is_metadata, | |
1276 | int have_csum, u8 *csum, u64 generation, | |
1277 | u16 csum_size) | |
96e36920 | 1278 | { |
b5d67f64 | 1279 | int page_num; |
96e36920 | 1280 | |
b5d67f64 SB |
1281 | sblock->no_io_error_seen = 1; |
1282 | sblock->header_error = 0; | |
1283 | sblock->checksum_error = 0; | |
96e36920 | 1284 | |
b5d67f64 SB |
1285 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
1286 | struct bio *bio; | |
7a9e9987 | 1287 | struct scrub_page *page = sblock->pagev[page_num]; |
b5d67f64 SB |
1288 | DECLARE_COMPLETION_ONSTACK(complete); |
1289 | ||
442a4f63 | 1290 | if (page->dev->bdev == NULL) { |
ea9947b4 SB |
1291 | page->io_error = 1; |
1292 | sblock->no_io_error_seen = 0; | |
1293 | continue; | |
1294 | } | |
1295 | ||
7a9e9987 | 1296 | WARN_ON(!page->page); |
b5d67f64 | 1297 | bio = bio_alloc(GFP_NOFS, 1); |
34f5c8e9 SB |
1298 | if (!bio) { |
1299 | page->io_error = 1; | |
1300 | sblock->no_io_error_seen = 0; | |
1301 | continue; | |
1302 | } | |
442a4f63 | 1303 | bio->bi_bdev = page->dev->bdev; |
b5d67f64 SB |
1304 | bio->bi_sector = page->physical >> 9; |
1305 | bio->bi_end_io = scrub_complete_bio_end_io; | |
1306 | bio->bi_private = &complete; | |
1307 | ||
34f5c8e9 | 1308 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
b5d67f64 | 1309 | btrfsic_submit_bio(READ, bio); |
96e36920 | 1310 | |
b5d67f64 SB |
1311 | /* this will also unplug the queue */ |
1312 | wait_for_completion(&complete); | |
96e36920 | 1313 | |
b5d67f64 SB |
1314 | page->io_error = !test_bit(BIO_UPTODATE, &bio->bi_flags); |
1315 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
1316 | sblock->no_io_error_seen = 0; | |
1317 | bio_put(bio); | |
1318 | } | |
96e36920 | 1319 | |
b5d67f64 SB |
1320 | if (sblock->no_io_error_seen) |
1321 | scrub_recheck_block_checksum(fs_info, sblock, is_metadata, | |
1322 | have_csum, csum, generation, | |
1323 | csum_size); | |
1324 | ||
34f5c8e9 | 1325 | return; |
a2de733c AJ |
1326 | } |
1327 | ||
b5d67f64 SB |
1328 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
1329 | struct scrub_block *sblock, | |
1330 | int is_metadata, int have_csum, | |
1331 | const u8 *csum, u64 generation, | |
1332 | u16 csum_size) | |
a2de733c | 1333 | { |
b5d67f64 SB |
1334 | int page_num; |
1335 | u8 calculated_csum[BTRFS_CSUM_SIZE]; | |
1336 | u32 crc = ~(u32)0; | |
1337 | struct btrfs_root *root = fs_info->extent_root; | |
1338 | void *mapped_buffer; | |
1339 | ||
7a9e9987 | 1340 | WARN_ON(!sblock->pagev[0]->page); |
b5d67f64 SB |
1341 | if (is_metadata) { |
1342 | struct btrfs_header *h; | |
1343 | ||
7a9e9987 | 1344 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 SB |
1345 | h = (struct btrfs_header *)mapped_buffer; |
1346 | ||
7a9e9987 | 1347 | if (sblock->pagev[0]->logical != le64_to_cpu(h->bytenr) || |
b5d67f64 SB |
1348 | memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE) || |
1349 | memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
442a4f63 | 1350 | BTRFS_UUID_SIZE)) { |
b5d67f64 | 1351 | sblock->header_error = 1; |
442a4f63 SB |
1352 | } else if (generation != le64_to_cpu(h->generation)) { |
1353 | sblock->header_error = 1; | |
1354 | sblock->generation_error = 1; | |
1355 | } | |
b5d67f64 SB |
1356 | csum = h->csum; |
1357 | } else { | |
1358 | if (!have_csum) | |
1359 | return; | |
a2de733c | 1360 | |
7a9e9987 | 1361 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
b5d67f64 | 1362 | } |
a2de733c | 1363 | |
b5d67f64 SB |
1364 | for (page_num = 0;;) { |
1365 | if (page_num == 0 && is_metadata) | |
1366 | crc = btrfs_csum_data(root, | |
1367 | ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE, | |
1368 | crc, PAGE_SIZE - BTRFS_CSUM_SIZE); | |
1369 | else | |
1370 | crc = btrfs_csum_data(root, mapped_buffer, crc, | |
1371 | PAGE_SIZE); | |
1372 | ||
9613bebb | 1373 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1374 | page_num++; |
1375 | if (page_num >= sblock->page_count) | |
1376 | break; | |
7a9e9987 | 1377 | WARN_ON(!sblock->pagev[page_num]->page); |
b5d67f64 | 1378 | |
7a9e9987 | 1379 | mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page); |
b5d67f64 SB |
1380 | } |
1381 | ||
1382 | btrfs_csum_final(crc, calculated_csum); | |
1383 | if (memcmp(calculated_csum, csum, csum_size)) | |
1384 | sblock->checksum_error = 1; | |
a2de733c AJ |
1385 | } |
1386 | ||
b5d67f64 | 1387 | static void scrub_complete_bio_end_io(struct bio *bio, int err) |
a2de733c | 1388 | { |
b5d67f64 SB |
1389 | complete((struct completion *)bio->bi_private); |
1390 | } | |
a2de733c | 1391 | |
b5d67f64 SB |
1392 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
1393 | struct scrub_block *sblock_good, | |
1394 | int force_write) | |
1395 | { | |
1396 | int page_num; | |
1397 | int ret = 0; | |
96e36920 | 1398 | |
b5d67f64 SB |
1399 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
1400 | int ret_sub; | |
96e36920 | 1401 | |
b5d67f64 SB |
1402 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
1403 | sblock_good, | |
1404 | page_num, | |
1405 | force_write); | |
1406 | if (ret_sub) | |
1407 | ret = ret_sub; | |
a2de733c | 1408 | } |
b5d67f64 SB |
1409 | |
1410 | return ret; | |
1411 | } | |
1412 | ||
1413 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, | |
1414 | struct scrub_block *sblock_good, | |
1415 | int page_num, int force_write) | |
1416 | { | |
7a9e9987 SB |
1417 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
1418 | struct scrub_page *page_good = sblock_good->pagev[page_num]; | |
b5d67f64 | 1419 | |
7a9e9987 SB |
1420 | BUG_ON(page_bad->page == NULL); |
1421 | BUG_ON(page_good->page == NULL); | |
b5d67f64 SB |
1422 | if (force_write || sblock_bad->header_error || |
1423 | sblock_bad->checksum_error || page_bad->io_error) { | |
1424 | struct bio *bio; | |
1425 | int ret; | |
1426 | DECLARE_COMPLETION_ONSTACK(complete); | |
1427 | ||
ff023aac SB |
1428 | if (!page_bad->dev->bdev) { |
1429 | printk_ratelimited(KERN_WARNING | |
1430 | "btrfs: scrub_repair_page_from_good_copy(bdev == NULL) is unexpected!\n"); | |
1431 | return -EIO; | |
1432 | } | |
1433 | ||
b5d67f64 | 1434 | bio = bio_alloc(GFP_NOFS, 1); |
e627ee7b TI |
1435 | if (!bio) |
1436 | return -EIO; | |
442a4f63 | 1437 | bio->bi_bdev = page_bad->dev->bdev; |
b5d67f64 SB |
1438 | bio->bi_sector = page_bad->physical >> 9; |
1439 | bio->bi_end_io = scrub_complete_bio_end_io; | |
1440 | bio->bi_private = &complete; | |
1441 | ||
1442 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); | |
1443 | if (PAGE_SIZE != ret) { | |
1444 | bio_put(bio); | |
1445 | return -EIO; | |
13db62b7 | 1446 | } |
b5d67f64 SB |
1447 | btrfsic_submit_bio(WRITE, bio); |
1448 | ||
1449 | /* this will also unplug the queue */ | |
1450 | wait_for_completion(&complete); | |
442a4f63 SB |
1451 | if (!bio_flagged(bio, BIO_UPTODATE)) { |
1452 | btrfs_dev_stat_inc_and_print(page_bad->dev, | |
1453 | BTRFS_DEV_STAT_WRITE_ERRS); | |
ff023aac SB |
1454 | btrfs_dev_replace_stats_inc( |
1455 | &sblock_bad->sctx->dev_root->fs_info-> | |
1456 | dev_replace.num_write_errors); | |
442a4f63 SB |
1457 | bio_put(bio); |
1458 | return -EIO; | |
1459 | } | |
b5d67f64 | 1460 | bio_put(bio); |
a2de733c AJ |
1461 | } |
1462 | ||
b5d67f64 SB |
1463 | return 0; |
1464 | } | |
1465 | ||
ff023aac SB |
1466 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
1467 | { | |
1468 | int page_num; | |
1469 | ||
1470 | for (page_num = 0; page_num < sblock->page_count; page_num++) { | |
1471 | int ret; | |
1472 | ||
1473 | ret = scrub_write_page_to_dev_replace(sblock, page_num); | |
1474 | if (ret) | |
1475 | btrfs_dev_replace_stats_inc( | |
1476 | &sblock->sctx->dev_root->fs_info->dev_replace. | |
1477 | num_write_errors); | |
1478 | } | |
1479 | } | |
1480 | ||
1481 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, | |
1482 | int page_num) | |
1483 | { | |
1484 | struct scrub_page *spage = sblock->pagev[page_num]; | |
1485 | ||
1486 | BUG_ON(spage->page == NULL); | |
1487 | if (spage->io_error) { | |
1488 | void *mapped_buffer = kmap_atomic(spage->page); | |
1489 | ||
1490 | memset(mapped_buffer, 0, PAGE_CACHE_SIZE); | |
1491 | flush_dcache_page(spage->page); | |
1492 | kunmap_atomic(mapped_buffer); | |
1493 | } | |
1494 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); | |
1495 | } | |
1496 | ||
1497 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, | |
1498 | struct scrub_page *spage) | |
1499 | { | |
1500 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1501 | struct scrub_bio *sbio; | |
1502 | int ret; | |
1503 | ||
1504 | mutex_lock(&wr_ctx->wr_lock); | |
1505 | again: | |
1506 | if (!wr_ctx->wr_curr_bio) { | |
1507 | wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio), | |
1508 | GFP_NOFS); | |
1509 | if (!wr_ctx->wr_curr_bio) { | |
1510 | mutex_unlock(&wr_ctx->wr_lock); | |
1511 | return -ENOMEM; | |
1512 | } | |
1513 | wr_ctx->wr_curr_bio->sctx = sctx; | |
1514 | wr_ctx->wr_curr_bio->page_count = 0; | |
1515 | } | |
1516 | sbio = wr_ctx->wr_curr_bio; | |
1517 | if (sbio->page_count == 0) { | |
1518 | struct bio *bio; | |
1519 | ||
1520 | sbio->physical = spage->physical_for_dev_replace; | |
1521 | sbio->logical = spage->logical; | |
1522 | sbio->dev = wr_ctx->tgtdev; | |
1523 | bio = sbio->bio; | |
1524 | if (!bio) { | |
1525 | bio = bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio); | |
1526 | if (!bio) { | |
1527 | mutex_unlock(&wr_ctx->wr_lock); | |
1528 | return -ENOMEM; | |
1529 | } | |
1530 | sbio->bio = bio; | |
1531 | } | |
1532 | ||
1533 | bio->bi_private = sbio; | |
1534 | bio->bi_end_io = scrub_wr_bio_end_io; | |
1535 | bio->bi_bdev = sbio->dev->bdev; | |
1536 | bio->bi_sector = sbio->physical >> 9; | |
1537 | sbio->err = 0; | |
1538 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != | |
1539 | spage->physical_for_dev_replace || | |
1540 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
1541 | spage->logical) { | |
1542 | scrub_wr_submit(sctx); | |
1543 | goto again; | |
1544 | } | |
1545 | ||
1546 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1547 | if (ret != PAGE_SIZE) { | |
1548 | if (sbio->page_count < 1) { | |
1549 | bio_put(sbio->bio); | |
1550 | sbio->bio = NULL; | |
1551 | mutex_unlock(&wr_ctx->wr_lock); | |
1552 | return -EIO; | |
1553 | } | |
1554 | scrub_wr_submit(sctx); | |
1555 | goto again; | |
1556 | } | |
1557 | ||
1558 | sbio->pagev[sbio->page_count] = spage; | |
1559 | scrub_page_get(spage); | |
1560 | sbio->page_count++; | |
1561 | if (sbio->page_count == wr_ctx->pages_per_wr_bio) | |
1562 | scrub_wr_submit(sctx); | |
1563 | mutex_unlock(&wr_ctx->wr_lock); | |
1564 | ||
1565 | return 0; | |
1566 | } | |
1567 | ||
1568 | static void scrub_wr_submit(struct scrub_ctx *sctx) | |
1569 | { | |
1570 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; | |
1571 | struct scrub_bio *sbio; | |
1572 | ||
1573 | if (!wr_ctx->wr_curr_bio) | |
1574 | return; | |
1575 | ||
1576 | sbio = wr_ctx->wr_curr_bio; | |
1577 | wr_ctx->wr_curr_bio = NULL; | |
1578 | WARN_ON(!sbio->bio->bi_bdev); | |
1579 | scrub_pending_bio_inc(sctx); | |
1580 | /* process all writes in a single worker thread. Then the block layer | |
1581 | * orders the requests before sending them to the driver which | |
1582 | * doubled the write performance on spinning disks when measured | |
1583 | * with Linux 3.5 */ | |
1584 | btrfsic_submit_bio(WRITE, sbio->bio); | |
1585 | } | |
1586 | ||
1587 | static void scrub_wr_bio_end_io(struct bio *bio, int err) | |
1588 | { | |
1589 | struct scrub_bio *sbio = bio->bi_private; | |
1590 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; | |
1591 | ||
1592 | sbio->err = err; | |
1593 | sbio->bio = bio; | |
1594 | ||
1595 | sbio->work.func = scrub_wr_bio_end_io_worker; | |
1596 | btrfs_queue_worker(&fs_info->scrub_wr_completion_workers, &sbio->work); | |
1597 | } | |
1598 | ||
1599 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) | |
1600 | { | |
1601 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
1602 | struct scrub_ctx *sctx = sbio->sctx; | |
1603 | int i; | |
1604 | ||
1605 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); | |
1606 | if (sbio->err) { | |
1607 | struct btrfs_dev_replace *dev_replace = | |
1608 | &sbio->sctx->dev_root->fs_info->dev_replace; | |
1609 | ||
1610 | for (i = 0; i < sbio->page_count; i++) { | |
1611 | struct scrub_page *spage = sbio->pagev[i]; | |
1612 | ||
1613 | spage->io_error = 1; | |
1614 | btrfs_dev_replace_stats_inc(&dev_replace-> | |
1615 | num_write_errors); | |
1616 | } | |
1617 | } | |
1618 | ||
1619 | for (i = 0; i < sbio->page_count; i++) | |
1620 | scrub_page_put(sbio->pagev[i]); | |
1621 | ||
1622 | bio_put(sbio->bio); | |
1623 | kfree(sbio); | |
1624 | scrub_pending_bio_dec(sctx); | |
1625 | } | |
1626 | ||
1627 | static int scrub_checksum(struct scrub_block *sblock) | |
b5d67f64 SB |
1628 | { |
1629 | u64 flags; | |
1630 | int ret; | |
1631 | ||
7a9e9987 SB |
1632 | WARN_ON(sblock->page_count < 1); |
1633 | flags = sblock->pagev[0]->flags; | |
b5d67f64 SB |
1634 | ret = 0; |
1635 | if (flags & BTRFS_EXTENT_FLAG_DATA) | |
1636 | ret = scrub_checksum_data(sblock); | |
1637 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) | |
1638 | ret = scrub_checksum_tree_block(sblock); | |
1639 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) | |
1640 | (void)scrub_checksum_super(sblock); | |
1641 | else | |
1642 | WARN_ON(1); | |
1643 | if (ret) | |
1644 | scrub_handle_errored_block(sblock); | |
ff023aac SB |
1645 | |
1646 | return ret; | |
a2de733c AJ |
1647 | } |
1648 | ||
b5d67f64 | 1649 | static int scrub_checksum_data(struct scrub_block *sblock) |
a2de733c | 1650 | { |
d9d181c1 | 1651 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1652 | u8 csum[BTRFS_CSUM_SIZE]; |
b5d67f64 SB |
1653 | u8 *on_disk_csum; |
1654 | struct page *page; | |
1655 | void *buffer; | |
a2de733c AJ |
1656 | u32 crc = ~(u32)0; |
1657 | int fail = 0; | |
a36cf8b8 | 1658 | struct btrfs_root *root = sctx->dev_root; |
b5d67f64 SB |
1659 | u64 len; |
1660 | int index; | |
a2de733c | 1661 | |
b5d67f64 | 1662 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1663 | if (!sblock->pagev[0]->have_csum) |
a2de733c AJ |
1664 | return 0; |
1665 | ||
7a9e9987 SB |
1666 | on_disk_csum = sblock->pagev[0]->csum; |
1667 | page = sblock->pagev[0]->page; | |
9613bebb | 1668 | buffer = kmap_atomic(page); |
b5d67f64 | 1669 | |
d9d181c1 | 1670 | len = sctx->sectorsize; |
b5d67f64 SB |
1671 | index = 0; |
1672 | for (;;) { | |
1673 | u64 l = min_t(u64, len, PAGE_SIZE); | |
1674 | ||
1675 | crc = btrfs_csum_data(root, buffer, crc, l); | |
9613bebb | 1676 | kunmap_atomic(buffer); |
b5d67f64 SB |
1677 | len -= l; |
1678 | if (len == 0) | |
1679 | break; | |
1680 | index++; | |
1681 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1682 | BUG_ON(!sblock->pagev[index]->page); |
1683 | page = sblock->pagev[index]->page; | |
9613bebb | 1684 | buffer = kmap_atomic(page); |
b5d67f64 SB |
1685 | } |
1686 | ||
a2de733c | 1687 | btrfs_csum_final(crc, csum); |
d9d181c1 | 1688 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1689 | fail = 1; |
1690 | ||
a2de733c AJ |
1691 | return fail; |
1692 | } | |
1693 | ||
b5d67f64 | 1694 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
a2de733c | 1695 | { |
d9d181c1 | 1696 | struct scrub_ctx *sctx = sblock->sctx; |
a2de733c | 1697 | struct btrfs_header *h; |
a36cf8b8 | 1698 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 1699 | struct btrfs_fs_info *fs_info = root->fs_info; |
b5d67f64 SB |
1700 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1701 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1702 | struct page *page; | |
1703 | void *mapped_buffer; | |
1704 | u64 mapped_size; | |
1705 | void *p; | |
a2de733c AJ |
1706 | u32 crc = ~(u32)0; |
1707 | int fail = 0; | |
1708 | int crc_fail = 0; | |
b5d67f64 SB |
1709 | u64 len; |
1710 | int index; | |
1711 | ||
1712 | BUG_ON(sblock->page_count < 1); | |
7a9e9987 | 1713 | page = sblock->pagev[0]->page; |
9613bebb | 1714 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1715 | h = (struct btrfs_header *)mapped_buffer; |
d9d181c1 | 1716 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
a2de733c AJ |
1717 | |
1718 | /* | |
1719 | * we don't use the getter functions here, as we | |
1720 | * a) don't have an extent buffer and | |
1721 | * b) the page is already kmapped | |
1722 | */ | |
a2de733c | 1723 | |
7a9e9987 | 1724 | if (sblock->pagev[0]->logical != le64_to_cpu(h->bytenr)) |
a2de733c AJ |
1725 | ++fail; |
1726 | ||
7a9e9987 | 1727 | if (sblock->pagev[0]->generation != le64_to_cpu(h->generation)) |
a2de733c AJ |
1728 | ++fail; |
1729 | ||
1730 | if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) | |
1731 | ++fail; | |
1732 | ||
1733 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, | |
1734 | BTRFS_UUID_SIZE)) | |
1735 | ++fail; | |
1736 | ||
ff023aac | 1737 | WARN_ON(sctx->nodesize != sctx->leafsize); |
d9d181c1 | 1738 | len = sctx->nodesize - BTRFS_CSUM_SIZE; |
b5d67f64 SB |
1739 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
1740 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1741 | index = 0; | |
1742 | for (;;) { | |
1743 | u64 l = min_t(u64, len, mapped_size); | |
1744 | ||
1745 | crc = btrfs_csum_data(root, p, crc, l); | |
9613bebb | 1746 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1747 | len -= l; |
1748 | if (len == 0) | |
1749 | break; | |
1750 | index++; | |
1751 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1752 | BUG_ON(!sblock->pagev[index]->page); |
1753 | page = sblock->pagev[index]->page; | |
9613bebb | 1754 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1755 | mapped_size = PAGE_SIZE; |
1756 | p = mapped_buffer; | |
1757 | } | |
1758 | ||
1759 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1760 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
a2de733c AJ |
1761 | ++crc_fail; |
1762 | ||
a2de733c AJ |
1763 | return fail || crc_fail; |
1764 | } | |
1765 | ||
b5d67f64 | 1766 | static int scrub_checksum_super(struct scrub_block *sblock) |
a2de733c AJ |
1767 | { |
1768 | struct btrfs_super_block *s; | |
d9d181c1 | 1769 | struct scrub_ctx *sctx = sblock->sctx; |
a36cf8b8 | 1770 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 1771 | struct btrfs_fs_info *fs_info = root->fs_info; |
b5d67f64 SB |
1772 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
1773 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; | |
1774 | struct page *page; | |
1775 | void *mapped_buffer; | |
1776 | u64 mapped_size; | |
1777 | void *p; | |
a2de733c | 1778 | u32 crc = ~(u32)0; |
442a4f63 SB |
1779 | int fail_gen = 0; |
1780 | int fail_cor = 0; | |
b5d67f64 SB |
1781 | u64 len; |
1782 | int index; | |
a2de733c | 1783 | |
b5d67f64 | 1784 | BUG_ON(sblock->page_count < 1); |
7a9e9987 | 1785 | page = sblock->pagev[0]->page; |
9613bebb | 1786 | mapped_buffer = kmap_atomic(page); |
b5d67f64 | 1787 | s = (struct btrfs_super_block *)mapped_buffer; |
d9d181c1 | 1788 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
a2de733c | 1789 | |
7a9e9987 | 1790 | if (sblock->pagev[0]->logical != le64_to_cpu(s->bytenr)) |
442a4f63 | 1791 | ++fail_cor; |
a2de733c | 1792 | |
7a9e9987 | 1793 | if (sblock->pagev[0]->generation != le64_to_cpu(s->generation)) |
442a4f63 | 1794 | ++fail_gen; |
a2de733c AJ |
1795 | |
1796 | if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) | |
442a4f63 | 1797 | ++fail_cor; |
a2de733c | 1798 | |
b5d67f64 SB |
1799 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
1800 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; | |
1801 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; | |
1802 | index = 0; | |
1803 | for (;;) { | |
1804 | u64 l = min_t(u64, len, mapped_size); | |
1805 | ||
1806 | crc = btrfs_csum_data(root, p, crc, l); | |
9613bebb | 1807 | kunmap_atomic(mapped_buffer); |
b5d67f64 SB |
1808 | len -= l; |
1809 | if (len == 0) | |
1810 | break; | |
1811 | index++; | |
1812 | BUG_ON(index >= sblock->page_count); | |
7a9e9987 SB |
1813 | BUG_ON(!sblock->pagev[index]->page); |
1814 | page = sblock->pagev[index]->page; | |
9613bebb | 1815 | mapped_buffer = kmap_atomic(page); |
b5d67f64 SB |
1816 | mapped_size = PAGE_SIZE; |
1817 | p = mapped_buffer; | |
1818 | } | |
1819 | ||
1820 | btrfs_csum_final(crc, calculated_csum); | |
d9d181c1 | 1821 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
442a4f63 | 1822 | ++fail_cor; |
a2de733c | 1823 | |
442a4f63 | 1824 | if (fail_cor + fail_gen) { |
a2de733c AJ |
1825 | /* |
1826 | * if we find an error in a super block, we just report it. | |
1827 | * They will get written with the next transaction commit | |
1828 | * anyway | |
1829 | */ | |
d9d181c1 SB |
1830 | spin_lock(&sctx->stat_lock); |
1831 | ++sctx->stat.super_errors; | |
1832 | spin_unlock(&sctx->stat_lock); | |
442a4f63 | 1833 | if (fail_cor) |
7a9e9987 | 1834 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 SB |
1835 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
1836 | else | |
7a9e9987 | 1837 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
442a4f63 | 1838 | BTRFS_DEV_STAT_GENERATION_ERRS); |
a2de733c AJ |
1839 | } |
1840 | ||
442a4f63 | 1841 | return fail_cor + fail_gen; |
a2de733c AJ |
1842 | } |
1843 | ||
b5d67f64 SB |
1844 | static void scrub_block_get(struct scrub_block *sblock) |
1845 | { | |
1846 | atomic_inc(&sblock->ref_count); | |
1847 | } | |
1848 | ||
1849 | static void scrub_block_put(struct scrub_block *sblock) | |
1850 | { | |
1851 | if (atomic_dec_and_test(&sblock->ref_count)) { | |
1852 | int i; | |
1853 | ||
1854 | for (i = 0; i < sblock->page_count; i++) | |
7a9e9987 | 1855 | scrub_page_put(sblock->pagev[i]); |
b5d67f64 SB |
1856 | kfree(sblock); |
1857 | } | |
1858 | } | |
1859 | ||
7a9e9987 SB |
1860 | static void scrub_page_get(struct scrub_page *spage) |
1861 | { | |
1862 | atomic_inc(&spage->ref_count); | |
1863 | } | |
1864 | ||
1865 | static void scrub_page_put(struct scrub_page *spage) | |
1866 | { | |
1867 | if (atomic_dec_and_test(&spage->ref_count)) { | |
1868 | if (spage->page) | |
1869 | __free_page(spage->page); | |
1870 | kfree(spage); | |
1871 | } | |
1872 | } | |
1873 | ||
d9d181c1 | 1874 | static void scrub_submit(struct scrub_ctx *sctx) |
a2de733c AJ |
1875 | { |
1876 | struct scrub_bio *sbio; | |
1877 | ||
d9d181c1 | 1878 | if (sctx->curr == -1) |
1623edeb | 1879 | return; |
a2de733c | 1880 | |
d9d181c1 SB |
1881 | sbio = sctx->bios[sctx->curr]; |
1882 | sctx->curr = -1; | |
b6bfebc1 | 1883 | scrub_pending_bio_inc(sctx); |
a2de733c | 1884 | |
ff023aac SB |
1885 | if (!sbio->bio->bi_bdev) { |
1886 | /* | |
1887 | * this case should not happen. If btrfs_map_block() is | |
1888 | * wrong, it could happen for dev-replace operations on | |
1889 | * missing devices when no mirrors are available, but in | |
1890 | * this case it should already fail the mount. | |
1891 | * This case is handled correctly (but _very_ slowly). | |
1892 | */ | |
1893 | printk_ratelimited(KERN_WARNING | |
1894 | "btrfs: scrub_submit(bio bdev == NULL) is unexpected!\n"); | |
1895 | bio_endio(sbio->bio, -EIO); | |
1896 | } else { | |
1897 | btrfsic_submit_bio(READ, sbio->bio); | |
1898 | } | |
a2de733c AJ |
1899 | } |
1900 | ||
ff023aac SB |
1901 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
1902 | struct scrub_page *spage) | |
a2de733c | 1903 | { |
b5d67f64 | 1904 | struct scrub_block *sblock = spage->sblock; |
a2de733c | 1905 | struct scrub_bio *sbio; |
69f4cb52 | 1906 | int ret; |
a2de733c AJ |
1907 | |
1908 | again: | |
1909 | /* | |
1910 | * grab a fresh bio or wait for one to become available | |
1911 | */ | |
d9d181c1 SB |
1912 | while (sctx->curr == -1) { |
1913 | spin_lock(&sctx->list_lock); | |
1914 | sctx->curr = sctx->first_free; | |
1915 | if (sctx->curr != -1) { | |
1916 | sctx->first_free = sctx->bios[sctx->curr]->next_free; | |
1917 | sctx->bios[sctx->curr]->next_free = -1; | |
1918 | sctx->bios[sctx->curr]->page_count = 0; | |
1919 | spin_unlock(&sctx->list_lock); | |
a2de733c | 1920 | } else { |
d9d181c1 SB |
1921 | spin_unlock(&sctx->list_lock); |
1922 | wait_event(sctx->list_wait, sctx->first_free != -1); | |
a2de733c AJ |
1923 | } |
1924 | } | |
d9d181c1 | 1925 | sbio = sctx->bios[sctx->curr]; |
b5d67f64 | 1926 | if (sbio->page_count == 0) { |
69f4cb52 AJ |
1927 | struct bio *bio; |
1928 | ||
b5d67f64 SB |
1929 | sbio->physical = spage->physical; |
1930 | sbio->logical = spage->logical; | |
a36cf8b8 | 1931 | sbio->dev = spage->dev; |
b5d67f64 SB |
1932 | bio = sbio->bio; |
1933 | if (!bio) { | |
ff023aac | 1934 | bio = bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio); |
b5d67f64 SB |
1935 | if (!bio) |
1936 | return -ENOMEM; | |
1937 | sbio->bio = bio; | |
1938 | } | |
69f4cb52 AJ |
1939 | |
1940 | bio->bi_private = sbio; | |
1941 | bio->bi_end_io = scrub_bio_end_io; | |
a36cf8b8 SB |
1942 | bio->bi_bdev = sbio->dev->bdev; |
1943 | bio->bi_sector = sbio->physical >> 9; | |
69f4cb52 | 1944 | sbio->err = 0; |
b5d67f64 SB |
1945 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
1946 | spage->physical || | |
1947 | sbio->logical + sbio->page_count * PAGE_SIZE != | |
a36cf8b8 SB |
1948 | spage->logical || |
1949 | sbio->dev != spage->dev) { | |
d9d181c1 | 1950 | scrub_submit(sctx); |
a2de733c AJ |
1951 | goto again; |
1952 | } | |
69f4cb52 | 1953 | |
b5d67f64 SB |
1954 | sbio->pagev[sbio->page_count] = spage; |
1955 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); | |
1956 | if (ret != PAGE_SIZE) { | |
1957 | if (sbio->page_count < 1) { | |
1958 | bio_put(sbio->bio); | |
1959 | sbio->bio = NULL; | |
1960 | return -EIO; | |
1961 | } | |
d9d181c1 | 1962 | scrub_submit(sctx); |
69f4cb52 AJ |
1963 | goto again; |
1964 | } | |
1965 | ||
ff023aac | 1966 | scrub_block_get(sblock); /* one for the page added to the bio */ |
b5d67f64 SB |
1967 | atomic_inc(&sblock->outstanding_pages); |
1968 | sbio->page_count++; | |
ff023aac | 1969 | if (sbio->page_count == sctx->pages_per_rd_bio) |
d9d181c1 | 1970 | scrub_submit(sctx); |
b5d67f64 SB |
1971 | |
1972 | return 0; | |
1973 | } | |
1974 | ||
d9d181c1 | 1975 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 1976 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac SB |
1977 | u64 gen, int mirror_num, u8 *csum, int force, |
1978 | u64 physical_for_dev_replace) | |
b5d67f64 SB |
1979 | { |
1980 | struct scrub_block *sblock; | |
1981 | int index; | |
1982 | ||
1983 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); | |
1984 | if (!sblock) { | |
d9d181c1 SB |
1985 | spin_lock(&sctx->stat_lock); |
1986 | sctx->stat.malloc_errors++; | |
1987 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 1988 | return -ENOMEM; |
a2de733c | 1989 | } |
b5d67f64 | 1990 | |
7a9e9987 SB |
1991 | /* one ref inside this function, plus one for each page added to |
1992 | * a bio later on */ | |
b5d67f64 | 1993 | atomic_set(&sblock->ref_count, 1); |
d9d181c1 | 1994 | sblock->sctx = sctx; |
b5d67f64 SB |
1995 | sblock->no_io_error_seen = 1; |
1996 | ||
1997 | for (index = 0; len > 0; index++) { | |
7a9e9987 | 1998 | struct scrub_page *spage; |
b5d67f64 SB |
1999 | u64 l = min_t(u64, len, PAGE_SIZE); |
2000 | ||
7a9e9987 SB |
2001 | spage = kzalloc(sizeof(*spage), GFP_NOFS); |
2002 | if (!spage) { | |
2003 | leave_nomem: | |
d9d181c1 SB |
2004 | spin_lock(&sctx->stat_lock); |
2005 | sctx->stat.malloc_errors++; | |
2006 | spin_unlock(&sctx->stat_lock); | |
7a9e9987 | 2007 | scrub_block_put(sblock); |
b5d67f64 SB |
2008 | return -ENOMEM; |
2009 | } | |
7a9e9987 SB |
2010 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
2011 | scrub_page_get(spage); | |
2012 | sblock->pagev[index] = spage; | |
b5d67f64 | 2013 | spage->sblock = sblock; |
a36cf8b8 | 2014 | spage->dev = dev; |
b5d67f64 SB |
2015 | spage->flags = flags; |
2016 | spage->generation = gen; | |
2017 | spage->logical = logical; | |
2018 | spage->physical = physical; | |
ff023aac | 2019 | spage->physical_for_dev_replace = physical_for_dev_replace; |
b5d67f64 SB |
2020 | spage->mirror_num = mirror_num; |
2021 | if (csum) { | |
2022 | spage->have_csum = 1; | |
d9d181c1 | 2023 | memcpy(spage->csum, csum, sctx->csum_size); |
b5d67f64 SB |
2024 | } else { |
2025 | spage->have_csum = 0; | |
2026 | } | |
2027 | sblock->page_count++; | |
7a9e9987 SB |
2028 | spage->page = alloc_page(GFP_NOFS); |
2029 | if (!spage->page) | |
2030 | goto leave_nomem; | |
b5d67f64 SB |
2031 | len -= l; |
2032 | logical += l; | |
2033 | physical += l; | |
ff023aac | 2034 | physical_for_dev_replace += l; |
b5d67f64 SB |
2035 | } |
2036 | ||
7a9e9987 | 2037 | WARN_ON(sblock->page_count == 0); |
b5d67f64 | 2038 | for (index = 0; index < sblock->page_count; index++) { |
7a9e9987 | 2039 | struct scrub_page *spage = sblock->pagev[index]; |
1bc87793 AJ |
2040 | int ret; |
2041 | ||
ff023aac | 2042 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
b5d67f64 SB |
2043 | if (ret) { |
2044 | scrub_block_put(sblock); | |
1bc87793 | 2045 | return ret; |
b5d67f64 | 2046 | } |
1bc87793 | 2047 | } |
a2de733c | 2048 | |
b5d67f64 | 2049 | if (force) |
d9d181c1 | 2050 | scrub_submit(sctx); |
a2de733c | 2051 | |
b5d67f64 SB |
2052 | /* last one frees, either here or in bio completion for last page */ |
2053 | scrub_block_put(sblock); | |
a2de733c AJ |
2054 | return 0; |
2055 | } | |
2056 | ||
b5d67f64 SB |
2057 | static void scrub_bio_end_io(struct bio *bio, int err) |
2058 | { | |
2059 | struct scrub_bio *sbio = bio->bi_private; | |
a36cf8b8 | 2060 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
b5d67f64 SB |
2061 | |
2062 | sbio->err = err; | |
2063 | sbio->bio = bio; | |
2064 | ||
2065 | btrfs_queue_worker(&fs_info->scrub_workers, &sbio->work); | |
2066 | } | |
2067 | ||
2068 | static void scrub_bio_end_io_worker(struct btrfs_work *work) | |
2069 | { | |
2070 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); | |
d9d181c1 | 2071 | struct scrub_ctx *sctx = sbio->sctx; |
b5d67f64 SB |
2072 | int i; |
2073 | ||
ff023aac | 2074 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
b5d67f64 SB |
2075 | if (sbio->err) { |
2076 | for (i = 0; i < sbio->page_count; i++) { | |
2077 | struct scrub_page *spage = sbio->pagev[i]; | |
2078 | ||
2079 | spage->io_error = 1; | |
2080 | spage->sblock->no_io_error_seen = 0; | |
2081 | } | |
2082 | } | |
2083 | ||
2084 | /* now complete the scrub_block items that have all pages completed */ | |
2085 | for (i = 0; i < sbio->page_count; i++) { | |
2086 | struct scrub_page *spage = sbio->pagev[i]; | |
2087 | struct scrub_block *sblock = spage->sblock; | |
2088 | ||
2089 | if (atomic_dec_and_test(&sblock->outstanding_pages)) | |
2090 | scrub_block_complete(sblock); | |
2091 | scrub_block_put(sblock); | |
2092 | } | |
2093 | ||
b5d67f64 SB |
2094 | bio_put(sbio->bio); |
2095 | sbio->bio = NULL; | |
d9d181c1 SB |
2096 | spin_lock(&sctx->list_lock); |
2097 | sbio->next_free = sctx->first_free; | |
2098 | sctx->first_free = sbio->index; | |
2099 | spin_unlock(&sctx->list_lock); | |
ff023aac SB |
2100 | |
2101 | if (sctx->is_dev_replace && | |
2102 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { | |
2103 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2104 | scrub_wr_submit(sctx); | |
2105 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2106 | } | |
2107 | ||
b6bfebc1 | 2108 | scrub_pending_bio_dec(sctx); |
b5d67f64 SB |
2109 | } |
2110 | ||
2111 | static void scrub_block_complete(struct scrub_block *sblock) | |
2112 | { | |
ff023aac | 2113 | if (!sblock->no_io_error_seen) { |
b5d67f64 | 2114 | scrub_handle_errored_block(sblock); |
ff023aac SB |
2115 | } else { |
2116 | /* | |
2117 | * if has checksum error, write via repair mechanism in | |
2118 | * dev replace case, otherwise write here in dev replace | |
2119 | * case. | |
2120 | */ | |
2121 | if (!scrub_checksum(sblock) && sblock->sctx->is_dev_replace) | |
2122 | scrub_write_block_to_dev_replace(sblock); | |
2123 | } | |
b5d67f64 SB |
2124 | } |
2125 | ||
d9d181c1 | 2126 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len, |
a2de733c AJ |
2127 | u8 *csum) |
2128 | { | |
2129 | struct btrfs_ordered_sum *sum = NULL; | |
2130 | int ret = 0; | |
2131 | unsigned long i; | |
2132 | unsigned long num_sectors; | |
a2de733c | 2133 | |
d9d181c1 SB |
2134 | while (!list_empty(&sctx->csum_list)) { |
2135 | sum = list_first_entry(&sctx->csum_list, | |
a2de733c AJ |
2136 | struct btrfs_ordered_sum, list); |
2137 | if (sum->bytenr > logical) | |
2138 | return 0; | |
2139 | if (sum->bytenr + sum->len > logical) | |
2140 | break; | |
2141 | ||
d9d181c1 | 2142 | ++sctx->stat.csum_discards; |
a2de733c AJ |
2143 | list_del(&sum->list); |
2144 | kfree(sum); | |
2145 | sum = NULL; | |
2146 | } | |
2147 | if (!sum) | |
2148 | return 0; | |
2149 | ||
d9d181c1 | 2150 | num_sectors = sum->len / sctx->sectorsize; |
a2de733c AJ |
2151 | for (i = 0; i < num_sectors; ++i) { |
2152 | if (sum->sums[i].bytenr == logical) { | |
d9d181c1 | 2153 | memcpy(csum, &sum->sums[i].sum, sctx->csum_size); |
a2de733c AJ |
2154 | ret = 1; |
2155 | break; | |
2156 | } | |
2157 | } | |
2158 | if (ret && i == num_sectors - 1) { | |
2159 | list_del(&sum->list); | |
2160 | kfree(sum); | |
2161 | } | |
2162 | return ret; | |
2163 | } | |
2164 | ||
2165 | /* scrub extent tries to collect up to 64 kB for each bio */ | |
d9d181c1 | 2166 | static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, |
a36cf8b8 | 2167 | u64 physical, struct btrfs_device *dev, u64 flags, |
ff023aac | 2168 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
a2de733c AJ |
2169 | { |
2170 | int ret; | |
2171 | u8 csum[BTRFS_CSUM_SIZE]; | |
b5d67f64 SB |
2172 | u32 blocksize; |
2173 | ||
2174 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
d9d181c1 SB |
2175 | blocksize = sctx->sectorsize; |
2176 | spin_lock(&sctx->stat_lock); | |
2177 | sctx->stat.data_extents_scrubbed++; | |
2178 | sctx->stat.data_bytes_scrubbed += len; | |
2179 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2180 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
ff023aac | 2181 | WARN_ON(sctx->nodesize != sctx->leafsize); |
d9d181c1 SB |
2182 | blocksize = sctx->nodesize; |
2183 | spin_lock(&sctx->stat_lock); | |
2184 | sctx->stat.tree_extents_scrubbed++; | |
2185 | sctx->stat.tree_bytes_scrubbed += len; | |
2186 | spin_unlock(&sctx->stat_lock); | |
b5d67f64 | 2187 | } else { |
d9d181c1 | 2188 | blocksize = sctx->sectorsize; |
ff023aac | 2189 | WARN_ON(1); |
b5d67f64 | 2190 | } |
a2de733c AJ |
2191 | |
2192 | while (len) { | |
b5d67f64 | 2193 | u64 l = min_t(u64, len, blocksize); |
a2de733c AJ |
2194 | int have_csum = 0; |
2195 | ||
2196 | if (flags & BTRFS_EXTENT_FLAG_DATA) { | |
2197 | /* push csums to sbio */ | |
d9d181c1 | 2198 | have_csum = scrub_find_csum(sctx, logical, l, csum); |
a2de733c | 2199 | if (have_csum == 0) |
d9d181c1 | 2200 | ++sctx->stat.no_csum; |
ff023aac SB |
2201 | if (sctx->is_dev_replace && !have_csum) { |
2202 | ret = copy_nocow_pages(sctx, logical, l, | |
2203 | mirror_num, | |
2204 | physical_for_dev_replace); | |
2205 | goto behind_scrub_pages; | |
2206 | } | |
a2de733c | 2207 | } |
a36cf8b8 | 2208 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
ff023aac SB |
2209 | mirror_num, have_csum ? csum : NULL, 0, |
2210 | physical_for_dev_replace); | |
2211 | behind_scrub_pages: | |
a2de733c AJ |
2212 | if (ret) |
2213 | return ret; | |
2214 | len -= l; | |
2215 | logical += l; | |
2216 | physical += l; | |
ff023aac | 2217 | physical_for_dev_replace += l; |
a2de733c AJ |
2218 | } |
2219 | return 0; | |
2220 | } | |
2221 | ||
d9d181c1 | 2222 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
a36cf8b8 SB |
2223 | struct map_lookup *map, |
2224 | struct btrfs_device *scrub_dev, | |
ff023aac SB |
2225 | int num, u64 base, u64 length, |
2226 | int is_dev_replace) | |
a2de733c AJ |
2227 | { |
2228 | struct btrfs_path *path; | |
a36cf8b8 | 2229 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
a2de733c AJ |
2230 | struct btrfs_root *root = fs_info->extent_root; |
2231 | struct btrfs_root *csum_root = fs_info->csum_root; | |
2232 | struct btrfs_extent_item *extent; | |
e7786c3a | 2233 | struct blk_plug plug; |
a2de733c AJ |
2234 | u64 flags; |
2235 | int ret; | |
2236 | int slot; | |
2237 | int i; | |
2238 | u64 nstripes; | |
a2de733c AJ |
2239 | struct extent_buffer *l; |
2240 | struct btrfs_key key; | |
2241 | u64 physical; | |
2242 | u64 logical; | |
2243 | u64 generation; | |
e12fa9cd | 2244 | int mirror_num; |
7a26285e AJ |
2245 | struct reada_control *reada1; |
2246 | struct reada_control *reada2; | |
2247 | struct btrfs_key key_start; | |
2248 | struct btrfs_key key_end; | |
a2de733c AJ |
2249 | u64 increment = map->stripe_len; |
2250 | u64 offset; | |
ff023aac SB |
2251 | u64 extent_logical; |
2252 | u64 extent_physical; | |
2253 | u64 extent_len; | |
2254 | struct btrfs_device *extent_dev; | |
2255 | int extent_mirror_num; | |
a2de733c AJ |
2256 | |
2257 | nstripes = length; | |
2258 | offset = 0; | |
2259 | do_div(nstripes, map->stripe_len); | |
2260 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
2261 | offset = map->stripe_len * num; | |
2262 | increment = map->stripe_len * map->num_stripes; | |
193ea74b | 2263 | mirror_num = 1; |
a2de733c AJ |
2264 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
2265 | int factor = map->num_stripes / map->sub_stripes; | |
2266 | offset = map->stripe_len * (num / map->sub_stripes); | |
2267 | increment = map->stripe_len * factor; | |
193ea74b | 2268 | mirror_num = num % map->sub_stripes + 1; |
a2de733c AJ |
2269 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
2270 | increment = map->stripe_len; | |
193ea74b | 2271 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
2272 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
2273 | increment = map->stripe_len; | |
193ea74b | 2274 | mirror_num = num % map->num_stripes + 1; |
a2de733c AJ |
2275 | } else { |
2276 | increment = map->stripe_len; | |
193ea74b | 2277 | mirror_num = 1; |
a2de733c AJ |
2278 | } |
2279 | ||
2280 | path = btrfs_alloc_path(); | |
2281 | if (!path) | |
2282 | return -ENOMEM; | |
2283 | ||
b5d67f64 SB |
2284 | /* |
2285 | * work on commit root. The related disk blocks are static as | |
2286 | * long as COW is applied. This means, it is save to rewrite | |
2287 | * them to repair disk errors without any race conditions | |
2288 | */ | |
a2de733c AJ |
2289 | path->search_commit_root = 1; |
2290 | path->skip_locking = 1; | |
2291 | ||
2292 | /* | |
7a26285e AJ |
2293 | * trigger the readahead for extent tree csum tree and wait for |
2294 | * completion. During readahead, the scrub is officially paused | |
2295 | * to not hold off transaction commits | |
a2de733c AJ |
2296 | */ |
2297 | logical = base + offset; | |
a2de733c | 2298 | |
d9d181c1 | 2299 | wait_event(sctx->list_wait, |
b6bfebc1 | 2300 | atomic_read(&sctx->bios_in_flight) == 0); |
7a26285e AJ |
2301 | atomic_inc(&fs_info->scrubs_paused); |
2302 | wake_up(&fs_info->scrub_pause_wait); | |
2303 | ||
2304 | /* FIXME it might be better to start readahead at commit root */ | |
2305 | key_start.objectid = logical; | |
2306 | key_start.type = BTRFS_EXTENT_ITEM_KEY; | |
2307 | key_start.offset = (u64)0; | |
2308 | key_end.objectid = base + offset + nstripes * increment; | |
2309 | key_end.type = BTRFS_EXTENT_ITEM_KEY; | |
2310 | key_end.offset = (u64)0; | |
2311 | reada1 = btrfs_reada_add(root, &key_start, &key_end); | |
2312 | ||
2313 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
2314 | key_start.type = BTRFS_EXTENT_CSUM_KEY; | |
2315 | key_start.offset = logical; | |
2316 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
2317 | key_end.type = BTRFS_EXTENT_CSUM_KEY; | |
2318 | key_end.offset = base + offset + nstripes * increment; | |
2319 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); | |
2320 | ||
2321 | if (!IS_ERR(reada1)) | |
2322 | btrfs_reada_wait(reada1); | |
2323 | if (!IS_ERR(reada2)) | |
2324 | btrfs_reada_wait(reada2); | |
2325 | ||
2326 | mutex_lock(&fs_info->scrub_lock); | |
2327 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
2328 | mutex_unlock(&fs_info->scrub_lock); | |
2329 | wait_event(fs_info->scrub_pause_wait, | |
2330 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
2331 | mutex_lock(&fs_info->scrub_lock); | |
a2de733c | 2332 | } |
7a26285e AJ |
2333 | atomic_dec(&fs_info->scrubs_paused); |
2334 | mutex_unlock(&fs_info->scrub_lock); | |
2335 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
2336 | |
2337 | /* | |
2338 | * collect all data csums for the stripe to avoid seeking during | |
2339 | * the scrub. This might currently (crc32) end up to be about 1MB | |
2340 | */ | |
e7786c3a | 2341 | blk_start_plug(&plug); |
a2de733c | 2342 | |
a2de733c AJ |
2343 | /* |
2344 | * now find all extents for each stripe and scrub them | |
2345 | */ | |
7a26285e AJ |
2346 | logical = base + offset; |
2347 | physical = map->stripes[num].physical; | |
a2de733c | 2348 | ret = 0; |
7a26285e | 2349 | for (i = 0; i < nstripes; ++i) { |
a2de733c AJ |
2350 | /* |
2351 | * canceled? | |
2352 | */ | |
2353 | if (atomic_read(&fs_info->scrub_cancel_req) || | |
d9d181c1 | 2354 | atomic_read(&sctx->cancel_req)) { |
a2de733c AJ |
2355 | ret = -ECANCELED; |
2356 | goto out; | |
2357 | } | |
2358 | /* | |
2359 | * check to see if we have to pause | |
2360 | */ | |
2361 | if (atomic_read(&fs_info->scrub_pause_req)) { | |
2362 | /* push queued extents */ | |
ff023aac | 2363 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
d9d181c1 | 2364 | scrub_submit(sctx); |
ff023aac SB |
2365 | mutex_lock(&sctx->wr_ctx.wr_lock); |
2366 | scrub_wr_submit(sctx); | |
2367 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
d9d181c1 | 2368 | wait_event(sctx->list_wait, |
b6bfebc1 | 2369 | atomic_read(&sctx->bios_in_flight) == 0); |
ff023aac | 2370 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
a2de733c AJ |
2371 | atomic_inc(&fs_info->scrubs_paused); |
2372 | wake_up(&fs_info->scrub_pause_wait); | |
2373 | mutex_lock(&fs_info->scrub_lock); | |
2374 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
2375 | mutex_unlock(&fs_info->scrub_lock); | |
2376 | wait_event(fs_info->scrub_pause_wait, | |
2377 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
2378 | mutex_lock(&fs_info->scrub_lock); | |
2379 | } | |
2380 | atomic_dec(&fs_info->scrubs_paused); | |
2381 | mutex_unlock(&fs_info->scrub_lock); | |
2382 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
2383 | } |
2384 | ||
7a26285e AJ |
2385 | ret = btrfs_lookup_csums_range(csum_root, logical, |
2386 | logical + map->stripe_len - 1, | |
d9d181c1 | 2387 | &sctx->csum_list, 1); |
7a26285e AJ |
2388 | if (ret) |
2389 | goto out; | |
2390 | ||
a2de733c AJ |
2391 | key.objectid = logical; |
2392 | key.type = BTRFS_EXTENT_ITEM_KEY; | |
2393 | key.offset = (u64)0; | |
2394 | ||
2395 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2396 | if (ret < 0) | |
2397 | goto out; | |
8c51032f | 2398 | if (ret > 0) { |
a2de733c AJ |
2399 | ret = btrfs_previous_item(root, path, 0, |
2400 | BTRFS_EXTENT_ITEM_KEY); | |
2401 | if (ret < 0) | |
2402 | goto out; | |
8c51032f AJ |
2403 | if (ret > 0) { |
2404 | /* there's no smaller item, so stick with the | |
2405 | * larger one */ | |
2406 | btrfs_release_path(path); | |
2407 | ret = btrfs_search_slot(NULL, root, &key, | |
2408 | path, 0, 0); | |
2409 | if (ret < 0) | |
2410 | goto out; | |
2411 | } | |
a2de733c AJ |
2412 | } |
2413 | ||
2414 | while (1) { | |
2415 | l = path->nodes[0]; | |
2416 | slot = path->slots[0]; | |
2417 | if (slot >= btrfs_header_nritems(l)) { | |
2418 | ret = btrfs_next_leaf(root, path); | |
2419 | if (ret == 0) | |
2420 | continue; | |
2421 | if (ret < 0) | |
2422 | goto out; | |
2423 | ||
2424 | break; | |
2425 | } | |
2426 | btrfs_item_key_to_cpu(l, &key, slot); | |
2427 | ||
2428 | if (key.objectid + key.offset <= logical) | |
2429 | goto next; | |
2430 | ||
2431 | if (key.objectid >= logical + map->stripe_len) | |
2432 | break; | |
2433 | ||
2434 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) | |
2435 | goto next; | |
2436 | ||
2437 | extent = btrfs_item_ptr(l, slot, | |
2438 | struct btrfs_extent_item); | |
2439 | flags = btrfs_extent_flags(l, extent); | |
2440 | generation = btrfs_extent_generation(l, extent); | |
2441 | ||
2442 | if (key.objectid < logical && | |
2443 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { | |
2444 | printk(KERN_ERR | |
2445 | "btrfs scrub: tree block %llu spanning " | |
2446 | "stripes, ignored. logical=%llu\n", | |
2447 | (unsigned long long)key.objectid, | |
2448 | (unsigned long long)logical); | |
2449 | goto next; | |
2450 | } | |
2451 | ||
2452 | /* | |
2453 | * trim extent to this stripe | |
2454 | */ | |
2455 | if (key.objectid < logical) { | |
2456 | key.offset -= logical - key.objectid; | |
2457 | key.objectid = logical; | |
2458 | } | |
2459 | if (key.objectid + key.offset > | |
2460 | logical + map->stripe_len) { | |
2461 | key.offset = logical + map->stripe_len - | |
2462 | key.objectid; | |
2463 | } | |
2464 | ||
ff023aac SB |
2465 | extent_logical = key.objectid; |
2466 | extent_physical = key.objectid - logical + physical; | |
2467 | extent_len = key.offset; | |
2468 | extent_dev = scrub_dev; | |
2469 | extent_mirror_num = mirror_num; | |
2470 | if (is_dev_replace) | |
2471 | scrub_remap_extent(fs_info, extent_logical, | |
2472 | extent_len, &extent_physical, | |
2473 | &extent_dev, | |
2474 | &extent_mirror_num); | |
2475 | ret = scrub_extent(sctx, extent_logical, extent_len, | |
2476 | extent_physical, extent_dev, flags, | |
2477 | generation, extent_mirror_num, | |
2478 | key.objectid - logical + physical); | |
a2de733c AJ |
2479 | if (ret) |
2480 | goto out; | |
2481 | ||
2482 | next: | |
2483 | path->slots[0]++; | |
2484 | } | |
71267333 | 2485 | btrfs_release_path(path); |
a2de733c AJ |
2486 | logical += increment; |
2487 | physical += map->stripe_len; | |
d9d181c1 SB |
2488 | spin_lock(&sctx->stat_lock); |
2489 | sctx->stat.last_physical = physical; | |
2490 | spin_unlock(&sctx->stat_lock); | |
a2de733c | 2491 | } |
ff023aac | 2492 | out: |
a2de733c | 2493 | /* push queued extents */ |
d9d181c1 | 2494 | scrub_submit(sctx); |
ff023aac SB |
2495 | mutex_lock(&sctx->wr_ctx.wr_lock); |
2496 | scrub_wr_submit(sctx); | |
2497 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
a2de733c | 2498 | |
e7786c3a | 2499 | blk_finish_plug(&plug); |
a2de733c AJ |
2500 | btrfs_free_path(path); |
2501 | return ret < 0 ? ret : 0; | |
2502 | } | |
2503 | ||
d9d181c1 | 2504 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
a36cf8b8 SB |
2505 | struct btrfs_device *scrub_dev, |
2506 | u64 chunk_tree, u64 chunk_objectid, | |
2507 | u64 chunk_offset, u64 length, | |
ff023aac | 2508 | u64 dev_offset, int is_dev_replace) |
a2de733c AJ |
2509 | { |
2510 | struct btrfs_mapping_tree *map_tree = | |
a36cf8b8 | 2511 | &sctx->dev_root->fs_info->mapping_tree; |
a2de733c AJ |
2512 | struct map_lookup *map; |
2513 | struct extent_map *em; | |
2514 | int i; | |
ff023aac | 2515 | int ret = 0; |
a2de733c AJ |
2516 | |
2517 | read_lock(&map_tree->map_tree.lock); | |
2518 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | |
2519 | read_unlock(&map_tree->map_tree.lock); | |
2520 | ||
2521 | if (!em) | |
2522 | return -EINVAL; | |
2523 | ||
2524 | map = (struct map_lookup *)em->bdev; | |
2525 | if (em->start != chunk_offset) | |
2526 | goto out; | |
2527 | ||
2528 | if (em->len < length) | |
2529 | goto out; | |
2530 | ||
2531 | for (i = 0; i < map->num_stripes; ++i) { | |
a36cf8b8 | 2532 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
859acaf1 | 2533 | map->stripes[i].physical == dev_offset) { |
a36cf8b8 | 2534 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
ff023aac SB |
2535 | chunk_offset, length, |
2536 | is_dev_replace); | |
a2de733c AJ |
2537 | if (ret) |
2538 | goto out; | |
2539 | } | |
2540 | } | |
2541 | out: | |
2542 | free_extent_map(em); | |
2543 | ||
2544 | return ret; | |
2545 | } | |
2546 | ||
2547 | static noinline_for_stack | |
a36cf8b8 | 2548 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
ff023aac SB |
2549 | struct btrfs_device *scrub_dev, u64 start, u64 end, |
2550 | int is_dev_replace) | |
a2de733c AJ |
2551 | { |
2552 | struct btrfs_dev_extent *dev_extent = NULL; | |
2553 | struct btrfs_path *path; | |
a36cf8b8 | 2554 | struct btrfs_root *root = sctx->dev_root; |
a2de733c AJ |
2555 | struct btrfs_fs_info *fs_info = root->fs_info; |
2556 | u64 length; | |
2557 | u64 chunk_tree; | |
2558 | u64 chunk_objectid; | |
2559 | u64 chunk_offset; | |
2560 | int ret; | |
2561 | int slot; | |
2562 | struct extent_buffer *l; | |
2563 | struct btrfs_key key; | |
2564 | struct btrfs_key found_key; | |
2565 | struct btrfs_block_group_cache *cache; | |
ff023aac | 2566 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
a2de733c AJ |
2567 | |
2568 | path = btrfs_alloc_path(); | |
2569 | if (!path) | |
2570 | return -ENOMEM; | |
2571 | ||
2572 | path->reada = 2; | |
2573 | path->search_commit_root = 1; | |
2574 | path->skip_locking = 1; | |
2575 | ||
a36cf8b8 | 2576 | key.objectid = scrub_dev->devid; |
a2de733c AJ |
2577 | key.offset = 0ull; |
2578 | key.type = BTRFS_DEV_EXTENT_KEY; | |
2579 | ||
a2de733c AJ |
2580 | while (1) { |
2581 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2582 | if (ret < 0) | |
8c51032f AJ |
2583 | break; |
2584 | if (ret > 0) { | |
2585 | if (path->slots[0] >= | |
2586 | btrfs_header_nritems(path->nodes[0])) { | |
2587 | ret = btrfs_next_leaf(root, path); | |
2588 | if (ret) | |
2589 | break; | |
2590 | } | |
2591 | } | |
a2de733c AJ |
2592 | |
2593 | l = path->nodes[0]; | |
2594 | slot = path->slots[0]; | |
2595 | ||
2596 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
2597 | ||
a36cf8b8 | 2598 | if (found_key.objectid != scrub_dev->devid) |
a2de733c AJ |
2599 | break; |
2600 | ||
8c51032f | 2601 | if (btrfs_key_type(&found_key) != BTRFS_DEV_EXTENT_KEY) |
a2de733c AJ |
2602 | break; |
2603 | ||
2604 | if (found_key.offset >= end) | |
2605 | break; | |
2606 | ||
2607 | if (found_key.offset < key.offset) | |
2608 | break; | |
2609 | ||
2610 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
2611 | length = btrfs_dev_extent_length(l, dev_extent); | |
2612 | ||
2613 | if (found_key.offset + length <= start) { | |
2614 | key.offset = found_key.offset + length; | |
71267333 | 2615 | btrfs_release_path(path); |
a2de733c AJ |
2616 | continue; |
2617 | } | |
2618 | ||
2619 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
2620 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
2621 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
2622 | ||
2623 | /* | |
2624 | * get a reference on the corresponding block group to prevent | |
2625 | * the chunk from going away while we scrub it | |
2626 | */ | |
2627 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
2628 | if (!cache) { | |
2629 | ret = -ENOENT; | |
8c51032f | 2630 | break; |
a2de733c | 2631 | } |
ff023aac SB |
2632 | dev_replace->cursor_right = found_key.offset + length; |
2633 | dev_replace->cursor_left = found_key.offset; | |
2634 | dev_replace->item_needs_writeback = 1; | |
a36cf8b8 | 2635 | ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid, |
ff023aac SB |
2636 | chunk_offset, length, found_key.offset, |
2637 | is_dev_replace); | |
2638 | ||
2639 | /* | |
2640 | * flush, submit all pending read and write bios, afterwards | |
2641 | * wait for them. | |
2642 | * Note that in the dev replace case, a read request causes | |
2643 | * write requests that are submitted in the read completion | |
2644 | * worker. Therefore in the current situation, it is required | |
2645 | * that all write requests are flushed, so that all read and | |
2646 | * write requests are really completed when bios_in_flight | |
2647 | * changes to 0. | |
2648 | */ | |
2649 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); | |
2650 | scrub_submit(sctx); | |
2651 | mutex_lock(&sctx->wr_ctx.wr_lock); | |
2652 | scrub_wr_submit(sctx); | |
2653 | mutex_unlock(&sctx->wr_ctx.wr_lock); | |
2654 | ||
2655 | wait_event(sctx->list_wait, | |
2656 | atomic_read(&sctx->bios_in_flight) == 0); | |
2657 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); | |
2658 | atomic_inc(&fs_info->scrubs_paused); | |
2659 | wake_up(&fs_info->scrub_pause_wait); | |
2660 | wait_event(sctx->list_wait, | |
2661 | atomic_read(&sctx->workers_pending) == 0); | |
2662 | ||
2663 | mutex_lock(&fs_info->scrub_lock); | |
2664 | while (atomic_read(&fs_info->scrub_pause_req)) { | |
2665 | mutex_unlock(&fs_info->scrub_lock); | |
2666 | wait_event(fs_info->scrub_pause_wait, | |
2667 | atomic_read(&fs_info->scrub_pause_req) == 0); | |
2668 | mutex_lock(&fs_info->scrub_lock); | |
2669 | } | |
2670 | atomic_dec(&fs_info->scrubs_paused); | |
2671 | mutex_unlock(&fs_info->scrub_lock); | |
2672 | wake_up(&fs_info->scrub_pause_wait); | |
2673 | ||
2674 | dev_replace->cursor_left = dev_replace->cursor_right; | |
2675 | dev_replace->item_needs_writeback = 1; | |
a2de733c AJ |
2676 | btrfs_put_block_group(cache); |
2677 | if (ret) | |
2678 | break; | |
af1be4f8 SB |
2679 | if (is_dev_replace && |
2680 | atomic64_read(&dev_replace->num_write_errors) > 0) { | |
ff023aac SB |
2681 | ret = -EIO; |
2682 | break; | |
2683 | } | |
2684 | if (sctx->stat.malloc_errors > 0) { | |
2685 | ret = -ENOMEM; | |
2686 | break; | |
2687 | } | |
a2de733c AJ |
2688 | |
2689 | key.offset = found_key.offset + length; | |
71267333 | 2690 | btrfs_release_path(path); |
a2de733c AJ |
2691 | } |
2692 | ||
a2de733c | 2693 | btrfs_free_path(path); |
8c51032f AJ |
2694 | |
2695 | /* | |
2696 | * ret can still be 1 from search_slot or next_leaf, | |
2697 | * that's not an error | |
2698 | */ | |
2699 | return ret < 0 ? ret : 0; | |
a2de733c AJ |
2700 | } |
2701 | ||
a36cf8b8 SB |
2702 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
2703 | struct btrfs_device *scrub_dev) | |
a2de733c AJ |
2704 | { |
2705 | int i; | |
2706 | u64 bytenr; | |
2707 | u64 gen; | |
2708 | int ret; | |
a36cf8b8 | 2709 | struct btrfs_root *root = sctx->dev_root; |
a2de733c | 2710 | |
79787eaa JM |
2711 | if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) |
2712 | return -EIO; | |
2713 | ||
a2de733c AJ |
2714 | gen = root->fs_info->last_trans_committed; |
2715 | ||
2716 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
2717 | bytenr = btrfs_sb_offset(i); | |
a36cf8b8 | 2718 | if (bytenr + BTRFS_SUPER_INFO_SIZE > scrub_dev->total_bytes) |
a2de733c AJ |
2719 | break; |
2720 | ||
d9d181c1 | 2721 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
a36cf8b8 | 2722 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
ff023aac | 2723 | NULL, 1, bytenr); |
a2de733c AJ |
2724 | if (ret) |
2725 | return ret; | |
2726 | } | |
b6bfebc1 | 2727 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
2728 | |
2729 | return 0; | |
2730 | } | |
2731 | ||
2732 | /* | |
2733 | * get a reference count on fs_info->scrub_workers. start worker if necessary | |
2734 | */ | |
ff023aac SB |
2735 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
2736 | int is_dev_replace) | |
a2de733c | 2737 | { |
0dc3b84a | 2738 | int ret = 0; |
a2de733c AJ |
2739 | |
2740 | mutex_lock(&fs_info->scrub_lock); | |
632dd772 | 2741 | if (fs_info->scrub_workers_refcnt == 0) { |
ff023aac SB |
2742 | if (is_dev_replace) |
2743 | btrfs_init_workers(&fs_info->scrub_workers, "scrub", 1, | |
2744 | &fs_info->generic_worker); | |
2745 | else | |
2746 | btrfs_init_workers(&fs_info->scrub_workers, "scrub", | |
2747 | fs_info->thread_pool_size, | |
2748 | &fs_info->generic_worker); | |
632dd772 | 2749 | fs_info->scrub_workers.idle_thresh = 4; |
0dc3b84a JB |
2750 | ret = btrfs_start_workers(&fs_info->scrub_workers); |
2751 | if (ret) | |
2752 | goto out; | |
ff023aac SB |
2753 | btrfs_init_workers(&fs_info->scrub_wr_completion_workers, |
2754 | "scrubwrc", | |
2755 | fs_info->thread_pool_size, | |
2756 | &fs_info->generic_worker); | |
2757 | fs_info->scrub_wr_completion_workers.idle_thresh = 2; | |
2758 | ret = btrfs_start_workers( | |
2759 | &fs_info->scrub_wr_completion_workers); | |
2760 | if (ret) | |
2761 | goto out; | |
2762 | btrfs_init_workers(&fs_info->scrub_nocow_workers, "scrubnc", 1, | |
2763 | &fs_info->generic_worker); | |
2764 | ret = btrfs_start_workers(&fs_info->scrub_nocow_workers); | |
2765 | if (ret) | |
2766 | goto out; | |
632dd772 | 2767 | } |
a2de733c | 2768 | ++fs_info->scrub_workers_refcnt; |
0dc3b84a | 2769 | out: |
a2de733c AJ |
2770 | mutex_unlock(&fs_info->scrub_lock); |
2771 | ||
0dc3b84a | 2772 | return ret; |
a2de733c AJ |
2773 | } |
2774 | ||
aa1b8cd4 | 2775 | static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info) |
a2de733c | 2776 | { |
a2de733c | 2777 | mutex_lock(&fs_info->scrub_lock); |
ff023aac | 2778 | if (--fs_info->scrub_workers_refcnt == 0) { |
a2de733c | 2779 | btrfs_stop_workers(&fs_info->scrub_workers); |
ff023aac SB |
2780 | btrfs_stop_workers(&fs_info->scrub_wr_completion_workers); |
2781 | btrfs_stop_workers(&fs_info->scrub_nocow_workers); | |
2782 | } | |
a2de733c AJ |
2783 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
2784 | mutex_unlock(&fs_info->scrub_lock); | |
2785 | } | |
2786 | ||
aa1b8cd4 SB |
2787 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
2788 | u64 end, struct btrfs_scrub_progress *progress, | |
63a212ab | 2789 | int readonly, int is_dev_replace) |
a2de733c | 2790 | { |
d9d181c1 | 2791 | struct scrub_ctx *sctx; |
a2de733c AJ |
2792 | int ret; |
2793 | struct btrfs_device *dev; | |
2794 | ||
aa1b8cd4 | 2795 | if (btrfs_fs_closing(fs_info)) |
a2de733c AJ |
2796 | return -EINVAL; |
2797 | ||
2798 | /* | |
2799 | * check some assumptions | |
2800 | */ | |
aa1b8cd4 | 2801 | if (fs_info->chunk_root->nodesize != fs_info->chunk_root->leafsize) { |
b5d67f64 SB |
2802 | printk(KERN_ERR |
2803 | "btrfs_scrub: size assumption nodesize == leafsize (%d == %d) fails\n", | |
aa1b8cd4 SB |
2804 | fs_info->chunk_root->nodesize, |
2805 | fs_info->chunk_root->leafsize); | |
b5d67f64 SB |
2806 | return -EINVAL; |
2807 | } | |
2808 | ||
aa1b8cd4 | 2809 | if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) { |
b5d67f64 SB |
2810 | /* |
2811 | * in this case scrub is unable to calculate the checksum | |
2812 | * the way scrub is implemented. Do not handle this | |
2813 | * situation at all because it won't ever happen. | |
2814 | */ | |
2815 | printk(KERN_ERR | |
2816 | "btrfs_scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails\n", | |
aa1b8cd4 | 2817 | fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN); |
b5d67f64 SB |
2818 | return -EINVAL; |
2819 | } | |
2820 | ||
aa1b8cd4 | 2821 | if (fs_info->chunk_root->sectorsize != PAGE_SIZE) { |
b5d67f64 SB |
2822 | /* not supported for data w/o checksums */ |
2823 | printk(KERN_ERR | |
2824 | "btrfs_scrub: size assumption sectorsize != PAGE_SIZE (%d != %lld) fails\n", | |
aa1b8cd4 SB |
2825 | fs_info->chunk_root->sectorsize, |
2826 | (unsigned long long)PAGE_SIZE); | |
a2de733c AJ |
2827 | return -EINVAL; |
2828 | } | |
2829 | ||
7a9e9987 SB |
2830 | if (fs_info->chunk_root->nodesize > |
2831 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || | |
2832 | fs_info->chunk_root->sectorsize > | |
2833 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { | |
2834 | /* | |
2835 | * would exhaust the array bounds of pagev member in | |
2836 | * struct scrub_block | |
2837 | */ | |
2838 | pr_err("btrfs_scrub: size assumption nodesize and sectorsize <= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails\n", | |
2839 | fs_info->chunk_root->nodesize, | |
2840 | SCRUB_MAX_PAGES_PER_BLOCK, | |
2841 | fs_info->chunk_root->sectorsize, | |
2842 | SCRUB_MAX_PAGES_PER_BLOCK); | |
2843 | return -EINVAL; | |
2844 | } | |
2845 | ||
ff023aac | 2846 | ret = scrub_workers_get(fs_info, is_dev_replace); |
a2de733c AJ |
2847 | if (ret) |
2848 | return ret; | |
2849 | ||
aa1b8cd4 SB |
2850 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
2851 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); | |
63a212ab | 2852 | if (!dev || (dev->missing && !is_dev_replace)) { |
aa1b8cd4 SB |
2853 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
2854 | scrub_workers_put(fs_info); | |
a2de733c AJ |
2855 | return -ENODEV; |
2856 | } | |
2857 | mutex_lock(&fs_info->scrub_lock); | |
2858 | ||
63a212ab | 2859 | if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) { |
a2de733c | 2860 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 SB |
2861 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
2862 | scrub_workers_put(fs_info); | |
2863 | return -EIO; | |
a2de733c AJ |
2864 | } |
2865 | ||
8dabb742 SB |
2866 | btrfs_dev_replace_lock(&fs_info->dev_replace); |
2867 | if (dev->scrub_device || | |
2868 | (!is_dev_replace && | |
2869 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { | |
2870 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
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); | |
a2de733c AJ |
2874 | return -EINPROGRESS; |
2875 | } | |
8dabb742 | 2876 | btrfs_dev_replace_unlock(&fs_info->dev_replace); |
63a212ab | 2877 | sctx = scrub_setup_ctx(dev, is_dev_replace); |
d9d181c1 | 2878 | if (IS_ERR(sctx)) { |
a2de733c | 2879 | mutex_unlock(&fs_info->scrub_lock); |
aa1b8cd4 SB |
2880 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
2881 | scrub_workers_put(fs_info); | |
d9d181c1 | 2882 | return PTR_ERR(sctx); |
a2de733c | 2883 | } |
d9d181c1 SB |
2884 | sctx->readonly = readonly; |
2885 | dev->scrub_device = sctx; | |
a2de733c AJ |
2886 | |
2887 | atomic_inc(&fs_info->scrubs_running); | |
2888 | mutex_unlock(&fs_info->scrub_lock); | |
aa1b8cd4 | 2889 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
a2de733c | 2890 | |
ff023aac SB |
2891 | if (!is_dev_replace) { |
2892 | down_read(&fs_info->scrub_super_lock); | |
2893 | ret = scrub_supers(sctx, dev); | |
2894 | up_read(&fs_info->scrub_super_lock); | |
2895 | } | |
a2de733c AJ |
2896 | |
2897 | if (!ret) | |
ff023aac SB |
2898 | ret = scrub_enumerate_chunks(sctx, dev, start, end, |
2899 | is_dev_replace); | |
a2de733c | 2900 | |
b6bfebc1 | 2901 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
a2de733c AJ |
2902 | atomic_dec(&fs_info->scrubs_running); |
2903 | wake_up(&fs_info->scrub_pause_wait); | |
2904 | ||
b6bfebc1 | 2905 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
0ef8e451 | 2906 | |
a2de733c | 2907 | if (progress) |
d9d181c1 | 2908 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
a2de733c AJ |
2909 | |
2910 | mutex_lock(&fs_info->scrub_lock); | |
2911 | dev->scrub_device = NULL; | |
2912 | mutex_unlock(&fs_info->scrub_lock); | |
2913 | ||
d9d181c1 | 2914 | scrub_free_ctx(sctx); |
aa1b8cd4 | 2915 | scrub_workers_put(fs_info); |
a2de733c AJ |
2916 | |
2917 | return ret; | |
2918 | } | |
2919 | ||
143bede5 | 2920 | void btrfs_scrub_pause(struct btrfs_root *root) |
a2de733c AJ |
2921 | { |
2922 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2923 | ||
2924 | mutex_lock(&fs_info->scrub_lock); | |
2925 | atomic_inc(&fs_info->scrub_pause_req); | |
2926 | while (atomic_read(&fs_info->scrubs_paused) != | |
2927 | atomic_read(&fs_info->scrubs_running)) { | |
2928 | mutex_unlock(&fs_info->scrub_lock); | |
2929 | wait_event(fs_info->scrub_pause_wait, | |
2930 | atomic_read(&fs_info->scrubs_paused) == | |
2931 | atomic_read(&fs_info->scrubs_running)); | |
2932 | mutex_lock(&fs_info->scrub_lock); | |
2933 | } | |
2934 | mutex_unlock(&fs_info->scrub_lock); | |
a2de733c AJ |
2935 | } |
2936 | ||
143bede5 | 2937 | void btrfs_scrub_continue(struct btrfs_root *root) |
a2de733c AJ |
2938 | { |
2939 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2940 | ||
2941 | atomic_dec(&fs_info->scrub_pause_req); | |
2942 | wake_up(&fs_info->scrub_pause_wait); | |
a2de733c AJ |
2943 | } |
2944 | ||
143bede5 | 2945 | void btrfs_scrub_pause_super(struct btrfs_root *root) |
a2de733c AJ |
2946 | { |
2947 | down_write(&root->fs_info->scrub_super_lock); | |
a2de733c AJ |
2948 | } |
2949 | ||
143bede5 | 2950 | void btrfs_scrub_continue_super(struct btrfs_root *root) |
a2de733c AJ |
2951 | { |
2952 | up_write(&root->fs_info->scrub_super_lock); | |
a2de733c AJ |
2953 | } |
2954 | ||
aa1b8cd4 | 2955 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
a2de733c | 2956 | { |
a2de733c AJ |
2957 | mutex_lock(&fs_info->scrub_lock); |
2958 | if (!atomic_read(&fs_info->scrubs_running)) { | |
2959 | mutex_unlock(&fs_info->scrub_lock); | |
2960 | return -ENOTCONN; | |
2961 | } | |
2962 | ||
2963 | atomic_inc(&fs_info->scrub_cancel_req); | |
2964 | while (atomic_read(&fs_info->scrubs_running)) { | |
2965 | mutex_unlock(&fs_info->scrub_lock); | |
2966 | wait_event(fs_info->scrub_pause_wait, | |
2967 | atomic_read(&fs_info->scrubs_running) == 0); | |
2968 | mutex_lock(&fs_info->scrub_lock); | |
2969 | } | |
2970 | atomic_dec(&fs_info->scrub_cancel_req); | |
2971 | mutex_unlock(&fs_info->scrub_lock); | |
2972 | ||
2973 | return 0; | |
2974 | } | |
2975 | ||
aa1b8cd4 SB |
2976 | int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info, |
2977 | struct btrfs_device *dev) | |
49b25e05 | 2978 | { |
d9d181c1 | 2979 | struct scrub_ctx *sctx; |
a2de733c AJ |
2980 | |
2981 | mutex_lock(&fs_info->scrub_lock); | |
d9d181c1 SB |
2982 | sctx = dev->scrub_device; |
2983 | if (!sctx) { | |
a2de733c AJ |
2984 | mutex_unlock(&fs_info->scrub_lock); |
2985 | return -ENOTCONN; | |
2986 | } | |
d9d181c1 | 2987 | atomic_inc(&sctx->cancel_req); |
a2de733c AJ |
2988 | while (dev->scrub_device) { |
2989 | mutex_unlock(&fs_info->scrub_lock); | |
2990 | wait_event(fs_info->scrub_pause_wait, | |
2991 | dev->scrub_device == NULL); | |
2992 | mutex_lock(&fs_info->scrub_lock); | |
2993 | } | |
2994 | mutex_unlock(&fs_info->scrub_lock); | |
2995 | ||
2996 | return 0; | |
2997 | } | |
1623edeb | 2998 | |
a2de733c AJ |
2999 | int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid) |
3000 | { | |
3001 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3002 | struct btrfs_device *dev; | |
3003 | int ret; | |
3004 | ||
3005 | /* | |
3006 | * we have to hold the device_list_mutex here so the device | |
3007 | * does not go away in cancel_dev. FIXME: find a better solution | |
3008 | */ | |
3009 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
aa1b8cd4 | 3010 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); |
a2de733c AJ |
3011 | if (!dev) { |
3012 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
3013 | return -ENODEV; | |
3014 | } | |
aa1b8cd4 | 3015 | ret = btrfs_scrub_cancel_dev(fs_info, dev); |
a2de733c AJ |
3016 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
3017 | ||
3018 | return ret; | |
3019 | } | |
3020 | ||
3021 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, | |
3022 | struct btrfs_scrub_progress *progress) | |
3023 | { | |
3024 | struct btrfs_device *dev; | |
d9d181c1 | 3025 | struct scrub_ctx *sctx = NULL; |
a2de733c AJ |
3026 | |
3027 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
aa1b8cd4 | 3028 | dev = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
a2de733c | 3029 | if (dev) |
d9d181c1 SB |
3030 | sctx = dev->scrub_device; |
3031 | if (sctx) | |
3032 | memcpy(progress, &sctx->stat, sizeof(*progress)); | |
a2de733c AJ |
3033 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
3034 | ||
d9d181c1 | 3035 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
a2de733c | 3036 | } |
ff023aac SB |
3037 | |
3038 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, | |
3039 | u64 extent_logical, u64 extent_len, | |
3040 | u64 *extent_physical, | |
3041 | struct btrfs_device **extent_dev, | |
3042 | int *extent_mirror_num) | |
3043 | { | |
3044 | u64 mapped_length; | |
3045 | struct btrfs_bio *bbio = NULL; | |
3046 | int ret; | |
3047 | ||
3048 | mapped_length = extent_len; | |
3049 | ret = btrfs_map_block(fs_info, READ, extent_logical, | |
3050 | &mapped_length, &bbio, 0); | |
3051 | if (ret || !bbio || mapped_length < extent_len || | |
3052 | !bbio->stripes[0].dev->bdev) { | |
3053 | kfree(bbio); | |
3054 | return; | |
3055 | } | |
3056 | ||
3057 | *extent_physical = bbio->stripes[0].physical; | |
3058 | *extent_mirror_num = bbio->mirror_num; | |
3059 | *extent_dev = bbio->stripes[0].dev; | |
3060 | kfree(bbio); | |
3061 | } | |
3062 | ||
3063 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, | |
3064 | struct scrub_wr_ctx *wr_ctx, | |
3065 | struct btrfs_fs_info *fs_info, | |
3066 | struct btrfs_device *dev, | |
3067 | int is_dev_replace) | |
3068 | { | |
3069 | WARN_ON(wr_ctx->wr_curr_bio != NULL); | |
3070 | ||
3071 | mutex_init(&wr_ctx->wr_lock); | |
3072 | wr_ctx->wr_curr_bio = NULL; | |
3073 | if (!is_dev_replace) | |
3074 | return 0; | |
3075 | ||
3076 | WARN_ON(!dev->bdev); | |
3077 | wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO, | |
3078 | bio_get_nr_vecs(dev->bdev)); | |
3079 | wr_ctx->tgtdev = dev; | |
3080 | atomic_set(&wr_ctx->flush_all_writes, 0); | |
3081 | return 0; | |
3082 | } | |
3083 | ||
3084 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx) | |
3085 | { | |
3086 | mutex_lock(&wr_ctx->wr_lock); | |
3087 | kfree(wr_ctx->wr_curr_bio); | |
3088 | wr_ctx->wr_curr_bio = NULL; | |
3089 | mutex_unlock(&wr_ctx->wr_lock); | |
3090 | } | |
3091 | ||
3092 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, | |
3093 | int mirror_num, u64 physical_for_dev_replace) | |
3094 | { | |
3095 | struct scrub_copy_nocow_ctx *nocow_ctx; | |
3096 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; | |
3097 | ||
3098 | nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS); | |
3099 | if (!nocow_ctx) { | |
3100 | spin_lock(&sctx->stat_lock); | |
3101 | sctx->stat.malloc_errors++; | |
3102 | spin_unlock(&sctx->stat_lock); | |
3103 | return -ENOMEM; | |
3104 | } | |
3105 | ||
3106 | scrub_pending_trans_workers_inc(sctx); | |
3107 | ||
3108 | nocow_ctx->sctx = sctx; | |
3109 | nocow_ctx->logical = logical; | |
3110 | nocow_ctx->len = len; | |
3111 | nocow_ctx->mirror_num = mirror_num; | |
3112 | nocow_ctx->physical_for_dev_replace = physical_for_dev_replace; | |
3113 | nocow_ctx->work.func = copy_nocow_pages_worker; | |
3114 | btrfs_queue_worker(&fs_info->scrub_nocow_workers, | |
3115 | &nocow_ctx->work); | |
3116 | ||
3117 | return 0; | |
3118 | } | |
3119 | ||
3120 | static void copy_nocow_pages_worker(struct btrfs_work *work) | |
3121 | { | |
3122 | struct scrub_copy_nocow_ctx *nocow_ctx = | |
3123 | container_of(work, struct scrub_copy_nocow_ctx, work); | |
3124 | struct scrub_ctx *sctx = nocow_ctx->sctx; | |
3125 | u64 logical = nocow_ctx->logical; | |
3126 | u64 len = nocow_ctx->len; | |
3127 | int mirror_num = nocow_ctx->mirror_num; | |
3128 | u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; | |
3129 | int ret; | |
3130 | struct btrfs_trans_handle *trans = NULL; | |
3131 | struct btrfs_fs_info *fs_info; | |
3132 | struct btrfs_path *path; | |
3133 | struct btrfs_root *root; | |
3134 | int not_written = 0; | |
3135 | ||
3136 | fs_info = sctx->dev_root->fs_info; | |
3137 | root = fs_info->extent_root; | |
3138 | ||
3139 | path = btrfs_alloc_path(); | |
3140 | if (!path) { | |
3141 | spin_lock(&sctx->stat_lock); | |
3142 | sctx->stat.malloc_errors++; | |
3143 | spin_unlock(&sctx->stat_lock); | |
3144 | not_written = 1; | |
3145 | goto out; | |
3146 | } | |
3147 | ||
3148 | trans = btrfs_join_transaction(root); | |
3149 | if (IS_ERR(trans)) { | |
3150 | not_written = 1; | |
3151 | goto out; | |
3152 | } | |
3153 | ||
3154 | ret = iterate_inodes_from_logical(logical, fs_info, path, | |
3155 | copy_nocow_pages_for_inode, | |
3156 | nocow_ctx); | |
3157 | if (ret != 0 && ret != -ENOENT) { | |
3158 | pr_warn("iterate_inodes_from_logical() failed: log %llu, phys %llu, len %llu, mir %llu, ret %d\n", | |
3159 | (unsigned long long)logical, | |
3160 | (unsigned long long)physical_for_dev_replace, | |
3161 | (unsigned long long)len, | |
3162 | (unsigned long long)mirror_num, ret); | |
3163 | not_written = 1; | |
3164 | goto out; | |
3165 | } | |
3166 | ||
3167 | out: | |
3168 | if (trans && !IS_ERR(trans)) | |
3169 | btrfs_end_transaction(trans, root); | |
3170 | if (not_written) | |
3171 | btrfs_dev_replace_stats_inc(&fs_info->dev_replace. | |
3172 | num_uncorrectable_read_errors); | |
3173 | ||
3174 | btrfs_free_path(path); | |
3175 | kfree(nocow_ctx); | |
3176 | ||
3177 | scrub_pending_trans_workers_dec(sctx); | |
3178 | } | |
3179 | ||
3180 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, void *ctx) | |
3181 | { | |
3182 | unsigned long index; | |
3183 | struct scrub_copy_nocow_ctx *nocow_ctx = ctx; | |
3184 | int ret = 0; | |
3185 | struct btrfs_key key; | |
3186 | struct inode *inode = NULL; | |
3187 | struct btrfs_root *local_root; | |
3188 | u64 physical_for_dev_replace; | |
3189 | u64 len; | |
3190 | struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info; | |
6f1c3605 | 3191 | int srcu_index; |
ff023aac SB |
3192 | |
3193 | key.objectid = root; | |
3194 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3195 | key.offset = (u64)-1; | |
6f1c3605 LB |
3196 | |
3197 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); | |
3198 | ||
ff023aac | 3199 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); |
6f1c3605 LB |
3200 | if (IS_ERR(local_root)) { |
3201 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); | |
ff023aac | 3202 | return PTR_ERR(local_root); |
6f1c3605 | 3203 | } |
ff023aac SB |
3204 | |
3205 | key.type = BTRFS_INODE_ITEM_KEY; | |
3206 | key.objectid = inum; | |
3207 | key.offset = 0; | |
3208 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); | |
6f1c3605 | 3209 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
ff023aac SB |
3210 | if (IS_ERR(inode)) |
3211 | return PTR_ERR(inode); | |
3212 | ||
3213 | physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; | |
3214 | len = nocow_ctx->len; | |
3215 | while (len >= PAGE_CACHE_SIZE) { | |
3216 | struct page *page = NULL; | |
3217 | int ret_sub; | |
3218 | ||
3219 | index = offset >> PAGE_CACHE_SHIFT; | |
3220 | ||
3221 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); | |
3222 | if (!page) { | |
3223 | pr_err("find_or_create_page() failed\n"); | |
3224 | ret = -ENOMEM; | |
3225 | goto next_page; | |
3226 | } | |
3227 | ||
3228 | if (PageUptodate(page)) { | |
3229 | if (PageDirty(page)) | |
3230 | goto next_page; | |
3231 | } else { | |
3232 | ClearPageError(page); | |
3233 | ret_sub = extent_read_full_page(&BTRFS_I(inode)-> | |
3234 | io_tree, | |
3235 | page, btrfs_get_extent, | |
3236 | nocow_ctx->mirror_num); | |
3237 | if (ret_sub) { | |
3238 | ret = ret_sub; | |
3239 | goto next_page; | |
3240 | } | |
3241 | wait_on_page_locked(page); | |
3242 | if (!PageUptodate(page)) { | |
3243 | ret = -EIO; | |
3244 | goto next_page; | |
3245 | } | |
3246 | } | |
3247 | ret_sub = write_page_nocow(nocow_ctx->sctx, | |
3248 | physical_for_dev_replace, page); | |
3249 | if (ret_sub) { | |
3250 | ret = ret_sub; | |
3251 | goto next_page; | |
3252 | } | |
3253 | ||
3254 | next_page: | |
3255 | if (page) { | |
3256 | unlock_page(page); | |
3257 | put_page(page); | |
3258 | } | |
3259 | offset += PAGE_CACHE_SIZE; | |
3260 | physical_for_dev_replace += PAGE_CACHE_SIZE; | |
3261 | len -= PAGE_CACHE_SIZE; | |
3262 | } | |
3263 | ||
3264 | if (inode) | |
3265 | iput(inode); | |
3266 | return ret; | |
3267 | } | |
3268 | ||
3269 | static int write_page_nocow(struct scrub_ctx *sctx, | |
3270 | u64 physical_for_dev_replace, struct page *page) | |
3271 | { | |
3272 | struct bio *bio; | |
3273 | struct btrfs_device *dev; | |
3274 | int ret; | |
3275 | DECLARE_COMPLETION_ONSTACK(compl); | |
3276 | ||
3277 | dev = sctx->wr_ctx.tgtdev; | |
3278 | if (!dev) | |
3279 | return -EIO; | |
3280 | if (!dev->bdev) { | |
3281 | printk_ratelimited(KERN_WARNING | |
3282 | "btrfs: scrub write_page_nocow(bdev == NULL) is unexpected!\n"); | |
3283 | return -EIO; | |
3284 | } | |
3285 | bio = bio_alloc(GFP_NOFS, 1); | |
3286 | if (!bio) { | |
3287 | spin_lock(&sctx->stat_lock); | |
3288 | sctx->stat.malloc_errors++; | |
3289 | spin_unlock(&sctx->stat_lock); | |
3290 | return -ENOMEM; | |
3291 | } | |
3292 | bio->bi_private = &compl; | |
3293 | bio->bi_end_io = scrub_complete_bio_end_io; | |
3294 | bio->bi_size = 0; | |
3295 | bio->bi_sector = physical_for_dev_replace >> 9; | |
3296 | bio->bi_bdev = dev->bdev; | |
3297 | ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); | |
3298 | if (ret != PAGE_CACHE_SIZE) { | |
3299 | leave_with_eio: | |
3300 | bio_put(bio); | |
3301 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); | |
3302 | return -EIO; | |
3303 | } | |
3304 | btrfsic_submit_bio(WRITE_SYNC, bio); | |
3305 | wait_for_completion(&compl); | |
3306 | ||
3307 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
3308 | goto leave_with_eio; | |
3309 | ||
3310 | bio_put(bio); | |
3311 | return 0; | |
3312 | } |