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53b381b3 DW |
1 | /* |
2 | * Copyright (C) 2012 Fusion-io All rights reserved. | |
3 | * Copyright (C) 2012 Intel Corp. All rights reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public | |
7 | * License v2 as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public | |
15 | * License along with this program; if not, write to the | |
16 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | * Boston, MA 021110-1307, USA. | |
18 | */ | |
19 | #include <linux/sched.h> | |
20 | #include <linux/wait.h> | |
21 | #include <linux/bio.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/buffer_head.h> | |
24 | #include <linux/blkdev.h> | |
25 | #include <linux/random.h> | |
26 | #include <linux/iocontext.h> | |
27 | #include <linux/capability.h> | |
28 | #include <linux/ratelimit.h> | |
29 | #include <linux/kthread.h> | |
30 | #include <linux/raid/pq.h> | |
31 | #include <linux/hash.h> | |
32 | #include <linux/list_sort.h> | |
33 | #include <linux/raid/xor.h> | |
d7011f5b | 34 | #include <linux/vmalloc.h> |
53b381b3 | 35 | #include <asm/div64.h> |
53b381b3 DW |
36 | #include "ctree.h" |
37 | #include "extent_map.h" | |
38 | #include "disk-io.h" | |
39 | #include "transaction.h" | |
40 | #include "print-tree.h" | |
41 | #include "volumes.h" | |
42 | #include "raid56.h" | |
43 | #include "async-thread.h" | |
44 | #include "check-integrity.h" | |
45 | #include "rcu-string.h" | |
46 | ||
47 | /* set when additional merges to this rbio are not allowed */ | |
48 | #define RBIO_RMW_LOCKED_BIT 1 | |
49 | ||
4ae10b3a CM |
50 | /* |
51 | * set when this rbio is sitting in the hash, but it is just a cache | |
52 | * of past RMW | |
53 | */ | |
54 | #define RBIO_CACHE_BIT 2 | |
55 | ||
56 | /* | |
57 | * set when it is safe to trust the stripe_pages for caching | |
58 | */ | |
59 | #define RBIO_CACHE_READY_BIT 3 | |
60 | ||
4ae10b3a CM |
61 | #define RBIO_CACHE_SIZE 1024 |
62 | ||
1b94b556 | 63 | enum btrfs_rbio_ops { |
b4ee1782 OS |
64 | BTRFS_RBIO_WRITE, |
65 | BTRFS_RBIO_READ_REBUILD, | |
66 | BTRFS_RBIO_PARITY_SCRUB, | |
67 | BTRFS_RBIO_REBUILD_MISSING, | |
1b94b556 MX |
68 | }; |
69 | ||
53b381b3 DW |
70 | struct btrfs_raid_bio { |
71 | struct btrfs_fs_info *fs_info; | |
72 | struct btrfs_bio *bbio; | |
73 | ||
53b381b3 DW |
74 | /* while we're doing rmw on a stripe |
75 | * we put it into a hash table so we can | |
76 | * lock the stripe and merge more rbios | |
77 | * into it. | |
78 | */ | |
79 | struct list_head hash_list; | |
80 | ||
4ae10b3a CM |
81 | /* |
82 | * LRU list for the stripe cache | |
83 | */ | |
84 | struct list_head stripe_cache; | |
85 | ||
53b381b3 DW |
86 | /* |
87 | * for scheduling work in the helper threads | |
88 | */ | |
89 | struct btrfs_work work; | |
90 | ||
91 | /* | |
92 | * bio list and bio_list_lock are used | |
93 | * to add more bios into the stripe | |
94 | * in hopes of avoiding the full rmw | |
95 | */ | |
96 | struct bio_list bio_list; | |
97 | spinlock_t bio_list_lock; | |
98 | ||
6ac0f488 CM |
99 | /* also protected by the bio_list_lock, the |
100 | * plug list is used by the plugging code | |
101 | * to collect partial bios while plugged. The | |
102 | * stripe locking code also uses it to hand off | |
53b381b3 DW |
103 | * the stripe lock to the next pending IO |
104 | */ | |
105 | struct list_head plug_list; | |
106 | ||
107 | /* | |
108 | * flags that tell us if it is safe to | |
109 | * merge with this bio | |
110 | */ | |
111 | unsigned long flags; | |
112 | ||
113 | /* size of each individual stripe on disk */ | |
114 | int stripe_len; | |
115 | ||
116 | /* number of data stripes (no p/q) */ | |
117 | int nr_data; | |
118 | ||
2c8cdd6e MX |
119 | int real_stripes; |
120 | ||
5a6ac9ea | 121 | int stripe_npages; |
53b381b3 DW |
122 | /* |
123 | * set if we're doing a parity rebuild | |
124 | * for a read from higher up, which is handled | |
125 | * differently from a parity rebuild as part of | |
126 | * rmw | |
127 | */ | |
1b94b556 | 128 | enum btrfs_rbio_ops operation; |
53b381b3 DW |
129 | |
130 | /* first bad stripe */ | |
131 | int faila; | |
132 | ||
133 | /* second bad stripe (for raid6 use) */ | |
134 | int failb; | |
135 | ||
5a6ac9ea | 136 | int scrubp; |
53b381b3 DW |
137 | /* |
138 | * number of pages needed to represent the full | |
139 | * stripe | |
140 | */ | |
141 | int nr_pages; | |
142 | ||
143 | /* | |
144 | * size of all the bios in the bio_list. This | |
145 | * helps us decide if the rbio maps to a full | |
146 | * stripe or not | |
147 | */ | |
148 | int bio_list_bytes; | |
149 | ||
4245215d MX |
150 | int generic_bio_cnt; |
151 | ||
53b381b3 DW |
152 | atomic_t refs; |
153 | ||
b89e1b01 MX |
154 | atomic_t stripes_pending; |
155 | ||
156 | atomic_t error; | |
53b381b3 DW |
157 | /* |
158 | * these are two arrays of pointers. We allocate the | |
159 | * rbio big enough to hold them both and setup their | |
160 | * locations when the rbio is allocated | |
161 | */ | |
162 | ||
163 | /* pointers to pages that we allocated for | |
164 | * reading/writing stripes directly from the disk (including P/Q) | |
165 | */ | |
166 | struct page **stripe_pages; | |
167 | ||
168 | /* | |
169 | * pointers to the pages in the bio_list. Stored | |
170 | * here for faster lookup | |
171 | */ | |
172 | struct page **bio_pages; | |
5a6ac9ea MX |
173 | |
174 | /* | |
175 | * bitmap to record which horizontal stripe has data | |
176 | */ | |
177 | unsigned long *dbitmap; | |
53b381b3 DW |
178 | }; |
179 | ||
180 | static int __raid56_parity_recover(struct btrfs_raid_bio *rbio); | |
181 | static noinline void finish_rmw(struct btrfs_raid_bio *rbio); | |
182 | static void rmw_work(struct btrfs_work *work); | |
183 | static void read_rebuild_work(struct btrfs_work *work); | |
184 | static void async_rmw_stripe(struct btrfs_raid_bio *rbio); | |
185 | static void async_read_rebuild(struct btrfs_raid_bio *rbio); | |
186 | static int fail_bio_stripe(struct btrfs_raid_bio *rbio, struct bio *bio); | |
187 | static int fail_rbio_index(struct btrfs_raid_bio *rbio, int failed); | |
188 | static void __free_raid_bio(struct btrfs_raid_bio *rbio); | |
189 | static void index_rbio_pages(struct btrfs_raid_bio *rbio); | |
190 | static int alloc_rbio_pages(struct btrfs_raid_bio *rbio); | |
191 | ||
5a6ac9ea MX |
192 | static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio, |
193 | int need_check); | |
194 | static void async_scrub_parity(struct btrfs_raid_bio *rbio); | |
195 | ||
53b381b3 DW |
196 | /* |
197 | * the stripe hash table is used for locking, and to collect | |
198 | * bios in hopes of making a full stripe | |
199 | */ | |
200 | int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info) | |
201 | { | |
202 | struct btrfs_stripe_hash_table *table; | |
203 | struct btrfs_stripe_hash_table *x; | |
204 | struct btrfs_stripe_hash *cur; | |
205 | struct btrfs_stripe_hash *h; | |
206 | int num_entries = 1 << BTRFS_STRIPE_HASH_TABLE_BITS; | |
207 | int i; | |
83c8266a | 208 | int table_size; |
53b381b3 DW |
209 | |
210 | if (info->stripe_hash_table) | |
211 | return 0; | |
212 | ||
83c8266a DS |
213 | /* |
214 | * The table is large, starting with order 4 and can go as high as | |
215 | * order 7 in case lock debugging is turned on. | |
216 | * | |
217 | * Try harder to allocate and fallback to vmalloc to lower the chance | |
218 | * of a failing mount. | |
219 | */ | |
220 | table_size = sizeof(*table) + sizeof(*h) * num_entries; | |
221 | table = kzalloc(table_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); | |
222 | if (!table) { | |
223 | table = vzalloc(table_size); | |
224 | if (!table) | |
225 | return -ENOMEM; | |
226 | } | |
53b381b3 | 227 | |
4ae10b3a CM |
228 | spin_lock_init(&table->cache_lock); |
229 | INIT_LIST_HEAD(&table->stripe_cache); | |
230 | ||
53b381b3 DW |
231 | h = table->table; |
232 | ||
233 | for (i = 0; i < num_entries; i++) { | |
234 | cur = h + i; | |
235 | INIT_LIST_HEAD(&cur->hash_list); | |
236 | spin_lock_init(&cur->lock); | |
237 | init_waitqueue_head(&cur->wait); | |
238 | } | |
239 | ||
240 | x = cmpxchg(&info->stripe_hash_table, NULL, table); | |
f749303b WS |
241 | if (x) |
242 | kvfree(x); | |
53b381b3 DW |
243 | return 0; |
244 | } | |
245 | ||
4ae10b3a CM |
246 | /* |
247 | * caching an rbio means to copy anything from the | |
248 | * bio_pages array into the stripe_pages array. We | |
249 | * use the page uptodate bit in the stripe cache array | |
250 | * to indicate if it has valid data | |
251 | * | |
252 | * once the caching is done, we set the cache ready | |
253 | * bit. | |
254 | */ | |
255 | static void cache_rbio_pages(struct btrfs_raid_bio *rbio) | |
256 | { | |
257 | int i; | |
258 | char *s; | |
259 | char *d; | |
260 | int ret; | |
261 | ||
262 | ret = alloc_rbio_pages(rbio); | |
263 | if (ret) | |
264 | return; | |
265 | ||
266 | for (i = 0; i < rbio->nr_pages; i++) { | |
267 | if (!rbio->bio_pages[i]) | |
268 | continue; | |
269 | ||
270 | s = kmap(rbio->bio_pages[i]); | |
271 | d = kmap(rbio->stripe_pages[i]); | |
272 | ||
09cbfeaf | 273 | memcpy(d, s, PAGE_SIZE); |
4ae10b3a CM |
274 | |
275 | kunmap(rbio->bio_pages[i]); | |
276 | kunmap(rbio->stripe_pages[i]); | |
277 | SetPageUptodate(rbio->stripe_pages[i]); | |
278 | } | |
279 | set_bit(RBIO_CACHE_READY_BIT, &rbio->flags); | |
280 | } | |
281 | ||
53b381b3 DW |
282 | /* |
283 | * we hash on the first logical address of the stripe | |
284 | */ | |
285 | static int rbio_bucket(struct btrfs_raid_bio *rbio) | |
286 | { | |
8e5cfb55 | 287 | u64 num = rbio->bbio->raid_map[0]; |
53b381b3 DW |
288 | |
289 | /* | |
290 | * we shift down quite a bit. We're using byte | |
291 | * addressing, and most of the lower bits are zeros. | |
292 | * This tends to upset hash_64, and it consistently | |
293 | * returns just one or two different values. | |
294 | * | |
295 | * shifting off the lower bits fixes things. | |
296 | */ | |
297 | return hash_64(num >> 16, BTRFS_STRIPE_HASH_TABLE_BITS); | |
298 | } | |
299 | ||
4ae10b3a CM |
300 | /* |
301 | * stealing an rbio means taking all the uptodate pages from the stripe | |
302 | * array in the source rbio and putting them into the destination rbio | |
303 | */ | |
304 | static void steal_rbio(struct btrfs_raid_bio *src, struct btrfs_raid_bio *dest) | |
305 | { | |
306 | int i; | |
307 | struct page *s; | |
308 | struct page *d; | |
309 | ||
310 | if (!test_bit(RBIO_CACHE_READY_BIT, &src->flags)) | |
311 | return; | |
312 | ||
313 | for (i = 0; i < dest->nr_pages; i++) { | |
314 | s = src->stripe_pages[i]; | |
315 | if (!s || !PageUptodate(s)) { | |
316 | continue; | |
317 | } | |
318 | ||
319 | d = dest->stripe_pages[i]; | |
320 | if (d) | |
321 | __free_page(d); | |
322 | ||
323 | dest->stripe_pages[i] = s; | |
324 | src->stripe_pages[i] = NULL; | |
325 | } | |
326 | } | |
327 | ||
53b381b3 DW |
328 | /* |
329 | * merging means we take the bio_list from the victim and | |
330 | * splice it into the destination. The victim should | |
331 | * be discarded afterwards. | |
332 | * | |
333 | * must be called with dest->rbio_list_lock held | |
334 | */ | |
335 | static void merge_rbio(struct btrfs_raid_bio *dest, | |
336 | struct btrfs_raid_bio *victim) | |
337 | { | |
338 | bio_list_merge(&dest->bio_list, &victim->bio_list); | |
339 | dest->bio_list_bytes += victim->bio_list_bytes; | |
4245215d | 340 | dest->generic_bio_cnt += victim->generic_bio_cnt; |
53b381b3 DW |
341 | bio_list_init(&victim->bio_list); |
342 | } | |
343 | ||
344 | /* | |
4ae10b3a CM |
345 | * used to prune items that are in the cache. The caller |
346 | * must hold the hash table lock. | |
347 | */ | |
348 | static void __remove_rbio_from_cache(struct btrfs_raid_bio *rbio) | |
349 | { | |
350 | int bucket = rbio_bucket(rbio); | |
351 | struct btrfs_stripe_hash_table *table; | |
352 | struct btrfs_stripe_hash *h; | |
353 | int freeit = 0; | |
354 | ||
355 | /* | |
356 | * check the bit again under the hash table lock. | |
357 | */ | |
358 | if (!test_bit(RBIO_CACHE_BIT, &rbio->flags)) | |
359 | return; | |
360 | ||
361 | table = rbio->fs_info->stripe_hash_table; | |
362 | h = table->table + bucket; | |
363 | ||
364 | /* hold the lock for the bucket because we may be | |
365 | * removing it from the hash table | |
366 | */ | |
367 | spin_lock(&h->lock); | |
368 | ||
369 | /* | |
370 | * hold the lock for the bio list because we need | |
371 | * to make sure the bio list is empty | |
372 | */ | |
373 | spin_lock(&rbio->bio_list_lock); | |
374 | ||
375 | if (test_and_clear_bit(RBIO_CACHE_BIT, &rbio->flags)) { | |
376 | list_del_init(&rbio->stripe_cache); | |
377 | table->cache_size -= 1; | |
378 | freeit = 1; | |
379 | ||
380 | /* if the bio list isn't empty, this rbio is | |
381 | * still involved in an IO. We take it out | |
382 | * of the cache list, and drop the ref that | |
383 | * was held for the list. | |
384 | * | |
385 | * If the bio_list was empty, we also remove | |
386 | * the rbio from the hash_table, and drop | |
387 | * the corresponding ref | |
388 | */ | |
389 | if (bio_list_empty(&rbio->bio_list)) { | |
390 | if (!list_empty(&rbio->hash_list)) { | |
391 | list_del_init(&rbio->hash_list); | |
392 | atomic_dec(&rbio->refs); | |
393 | BUG_ON(!list_empty(&rbio->plug_list)); | |
394 | } | |
395 | } | |
396 | } | |
397 | ||
398 | spin_unlock(&rbio->bio_list_lock); | |
399 | spin_unlock(&h->lock); | |
400 | ||
401 | if (freeit) | |
402 | __free_raid_bio(rbio); | |
403 | } | |
404 | ||
405 | /* | |
406 | * prune a given rbio from the cache | |
407 | */ | |
408 | static void remove_rbio_from_cache(struct btrfs_raid_bio *rbio) | |
409 | { | |
410 | struct btrfs_stripe_hash_table *table; | |
411 | unsigned long flags; | |
412 | ||
413 | if (!test_bit(RBIO_CACHE_BIT, &rbio->flags)) | |
414 | return; | |
415 | ||
416 | table = rbio->fs_info->stripe_hash_table; | |
417 | ||
418 | spin_lock_irqsave(&table->cache_lock, flags); | |
419 | __remove_rbio_from_cache(rbio); | |
420 | spin_unlock_irqrestore(&table->cache_lock, flags); | |
421 | } | |
422 | ||
423 | /* | |
424 | * remove everything in the cache | |
425 | */ | |
48a3b636 | 426 | static void btrfs_clear_rbio_cache(struct btrfs_fs_info *info) |
4ae10b3a CM |
427 | { |
428 | struct btrfs_stripe_hash_table *table; | |
429 | unsigned long flags; | |
430 | struct btrfs_raid_bio *rbio; | |
431 | ||
432 | table = info->stripe_hash_table; | |
433 | ||
434 | spin_lock_irqsave(&table->cache_lock, flags); | |
435 | while (!list_empty(&table->stripe_cache)) { | |
436 | rbio = list_entry(table->stripe_cache.next, | |
437 | struct btrfs_raid_bio, | |
438 | stripe_cache); | |
439 | __remove_rbio_from_cache(rbio); | |
440 | } | |
441 | spin_unlock_irqrestore(&table->cache_lock, flags); | |
442 | } | |
443 | ||
444 | /* | |
445 | * remove all cached entries and free the hash table | |
446 | * used by unmount | |
53b381b3 DW |
447 | */ |
448 | void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info) | |
449 | { | |
450 | if (!info->stripe_hash_table) | |
451 | return; | |
4ae10b3a | 452 | btrfs_clear_rbio_cache(info); |
f749303b | 453 | kvfree(info->stripe_hash_table); |
53b381b3 DW |
454 | info->stripe_hash_table = NULL; |
455 | } | |
456 | ||
4ae10b3a CM |
457 | /* |
458 | * insert an rbio into the stripe cache. It | |
459 | * must have already been prepared by calling | |
460 | * cache_rbio_pages | |
461 | * | |
462 | * If this rbio was already cached, it gets | |
463 | * moved to the front of the lru. | |
464 | * | |
465 | * If the size of the rbio cache is too big, we | |
466 | * prune an item. | |
467 | */ | |
468 | static void cache_rbio(struct btrfs_raid_bio *rbio) | |
469 | { | |
470 | struct btrfs_stripe_hash_table *table; | |
471 | unsigned long flags; | |
472 | ||
473 | if (!test_bit(RBIO_CACHE_READY_BIT, &rbio->flags)) | |
474 | return; | |
475 | ||
476 | table = rbio->fs_info->stripe_hash_table; | |
477 | ||
478 | spin_lock_irqsave(&table->cache_lock, flags); | |
479 | spin_lock(&rbio->bio_list_lock); | |
480 | ||
481 | /* bump our ref if we were not in the list before */ | |
482 | if (!test_and_set_bit(RBIO_CACHE_BIT, &rbio->flags)) | |
483 | atomic_inc(&rbio->refs); | |
484 | ||
485 | if (!list_empty(&rbio->stripe_cache)){ | |
486 | list_move(&rbio->stripe_cache, &table->stripe_cache); | |
487 | } else { | |
488 | list_add(&rbio->stripe_cache, &table->stripe_cache); | |
489 | table->cache_size += 1; | |
490 | } | |
491 | ||
492 | spin_unlock(&rbio->bio_list_lock); | |
493 | ||
494 | if (table->cache_size > RBIO_CACHE_SIZE) { | |
495 | struct btrfs_raid_bio *found; | |
496 | ||
497 | found = list_entry(table->stripe_cache.prev, | |
498 | struct btrfs_raid_bio, | |
499 | stripe_cache); | |
500 | ||
501 | if (found != rbio) | |
502 | __remove_rbio_from_cache(found); | |
503 | } | |
504 | ||
505 | spin_unlock_irqrestore(&table->cache_lock, flags); | |
4ae10b3a CM |
506 | } |
507 | ||
53b381b3 DW |
508 | /* |
509 | * helper function to run the xor_blocks api. It is only | |
510 | * able to do MAX_XOR_BLOCKS at a time, so we need to | |
511 | * loop through. | |
512 | */ | |
513 | static void run_xor(void **pages, int src_cnt, ssize_t len) | |
514 | { | |
515 | int src_off = 0; | |
516 | int xor_src_cnt = 0; | |
517 | void *dest = pages[src_cnt]; | |
518 | ||
519 | while(src_cnt > 0) { | |
520 | xor_src_cnt = min(src_cnt, MAX_XOR_BLOCKS); | |
521 | xor_blocks(xor_src_cnt, len, dest, pages + src_off); | |
522 | ||
523 | src_cnt -= xor_src_cnt; | |
524 | src_off += xor_src_cnt; | |
525 | } | |
526 | } | |
527 | ||
528 | /* | |
529 | * returns true if the bio list inside this rbio | |
530 | * covers an entire stripe (no rmw required). | |
531 | * Must be called with the bio list lock held, or | |
532 | * at a time when you know it is impossible to add | |
533 | * new bios into the list | |
534 | */ | |
535 | static int __rbio_is_full(struct btrfs_raid_bio *rbio) | |
536 | { | |
537 | unsigned long size = rbio->bio_list_bytes; | |
538 | int ret = 1; | |
539 | ||
540 | if (size != rbio->nr_data * rbio->stripe_len) | |
541 | ret = 0; | |
542 | ||
543 | BUG_ON(size > rbio->nr_data * rbio->stripe_len); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | static int rbio_is_full(struct btrfs_raid_bio *rbio) | |
548 | { | |
549 | unsigned long flags; | |
550 | int ret; | |
551 | ||
552 | spin_lock_irqsave(&rbio->bio_list_lock, flags); | |
553 | ret = __rbio_is_full(rbio); | |
554 | spin_unlock_irqrestore(&rbio->bio_list_lock, flags); | |
555 | return ret; | |
556 | } | |
557 | ||
558 | /* | |
559 | * returns 1 if it is safe to merge two rbios together. | |
560 | * The merging is safe if the two rbios correspond to | |
561 | * the same stripe and if they are both going in the same | |
562 | * direction (read vs write), and if neither one is | |
563 | * locked for final IO | |
564 | * | |
565 | * The caller is responsible for locking such that | |
566 | * rmw_locked is safe to test | |
567 | */ | |
568 | static int rbio_can_merge(struct btrfs_raid_bio *last, | |
569 | struct btrfs_raid_bio *cur) | |
570 | { | |
571 | if (test_bit(RBIO_RMW_LOCKED_BIT, &last->flags) || | |
572 | test_bit(RBIO_RMW_LOCKED_BIT, &cur->flags)) | |
573 | return 0; | |
574 | ||
4ae10b3a CM |
575 | /* |
576 | * we can't merge with cached rbios, since the | |
577 | * idea is that when we merge the destination | |
578 | * rbio is going to run our IO for us. We can | |
01327610 | 579 | * steal from cached rbios though, other functions |
4ae10b3a CM |
580 | * handle that. |
581 | */ | |
582 | if (test_bit(RBIO_CACHE_BIT, &last->flags) || | |
583 | test_bit(RBIO_CACHE_BIT, &cur->flags)) | |
584 | return 0; | |
585 | ||
8e5cfb55 ZL |
586 | if (last->bbio->raid_map[0] != |
587 | cur->bbio->raid_map[0]) | |
53b381b3 DW |
588 | return 0; |
589 | ||
5a6ac9ea MX |
590 | /* we can't merge with different operations */ |
591 | if (last->operation != cur->operation) | |
592 | return 0; | |
593 | /* | |
594 | * We've need read the full stripe from the drive. | |
595 | * check and repair the parity and write the new results. | |
596 | * | |
597 | * We're not allowed to add any new bios to the | |
598 | * bio list here, anyone else that wants to | |
599 | * change this stripe needs to do their own rmw. | |
600 | */ | |
601 | if (last->operation == BTRFS_RBIO_PARITY_SCRUB || | |
602 | cur->operation == BTRFS_RBIO_PARITY_SCRUB) | |
53b381b3 | 603 | return 0; |
53b381b3 | 604 | |
b4ee1782 OS |
605 | if (last->operation == BTRFS_RBIO_REBUILD_MISSING || |
606 | cur->operation == BTRFS_RBIO_REBUILD_MISSING) | |
607 | return 0; | |
608 | ||
53b381b3 DW |
609 | return 1; |
610 | } | |
611 | ||
b7178a5f ZL |
612 | static int rbio_stripe_page_index(struct btrfs_raid_bio *rbio, int stripe, |
613 | int index) | |
614 | { | |
615 | return stripe * rbio->stripe_npages + index; | |
616 | } | |
617 | ||
618 | /* | |
619 | * these are just the pages from the rbio array, not from anything | |
620 | * the FS sent down to us | |
621 | */ | |
622 | static struct page *rbio_stripe_page(struct btrfs_raid_bio *rbio, int stripe, | |
623 | int index) | |
624 | { | |
625 | return rbio->stripe_pages[rbio_stripe_page_index(rbio, stripe, index)]; | |
626 | } | |
627 | ||
53b381b3 DW |
628 | /* |
629 | * helper to index into the pstripe | |
630 | */ | |
631 | static struct page *rbio_pstripe_page(struct btrfs_raid_bio *rbio, int index) | |
632 | { | |
b7178a5f | 633 | return rbio_stripe_page(rbio, rbio->nr_data, index); |
53b381b3 DW |
634 | } |
635 | ||
636 | /* | |
637 | * helper to index into the qstripe, returns null | |
638 | * if there is no qstripe | |
639 | */ | |
640 | static struct page *rbio_qstripe_page(struct btrfs_raid_bio *rbio, int index) | |
641 | { | |
2c8cdd6e | 642 | if (rbio->nr_data + 1 == rbio->real_stripes) |
53b381b3 | 643 | return NULL; |
b7178a5f | 644 | return rbio_stripe_page(rbio, rbio->nr_data + 1, index); |
53b381b3 DW |
645 | } |
646 | ||
647 | /* | |
648 | * The first stripe in the table for a logical address | |
649 | * has the lock. rbios are added in one of three ways: | |
650 | * | |
651 | * 1) Nobody has the stripe locked yet. The rbio is given | |
652 | * the lock and 0 is returned. The caller must start the IO | |
653 | * themselves. | |
654 | * | |
655 | * 2) Someone has the stripe locked, but we're able to merge | |
656 | * with the lock owner. The rbio is freed and the IO will | |
657 | * start automatically along with the existing rbio. 1 is returned. | |
658 | * | |
659 | * 3) Someone has the stripe locked, but we're not able to merge. | |
660 | * The rbio is added to the lock owner's plug list, or merged into | |
661 | * an rbio already on the plug list. When the lock owner unlocks, | |
662 | * the next rbio on the list is run and the IO is started automatically. | |
663 | * 1 is returned | |
664 | * | |
665 | * If we return 0, the caller still owns the rbio and must continue with | |
666 | * IO submission. If we return 1, the caller must assume the rbio has | |
667 | * already been freed. | |
668 | */ | |
669 | static noinline int lock_stripe_add(struct btrfs_raid_bio *rbio) | |
670 | { | |
671 | int bucket = rbio_bucket(rbio); | |
672 | struct btrfs_stripe_hash *h = rbio->fs_info->stripe_hash_table->table + bucket; | |
673 | struct btrfs_raid_bio *cur; | |
674 | struct btrfs_raid_bio *pending; | |
675 | unsigned long flags; | |
676 | DEFINE_WAIT(wait); | |
677 | struct btrfs_raid_bio *freeit = NULL; | |
4ae10b3a | 678 | struct btrfs_raid_bio *cache_drop = NULL; |
53b381b3 | 679 | int ret = 0; |
53b381b3 DW |
680 | |
681 | spin_lock_irqsave(&h->lock, flags); | |
682 | list_for_each_entry(cur, &h->hash_list, hash_list) { | |
8e5cfb55 | 683 | if (cur->bbio->raid_map[0] == rbio->bbio->raid_map[0]) { |
53b381b3 DW |
684 | spin_lock(&cur->bio_list_lock); |
685 | ||
4ae10b3a CM |
686 | /* can we steal this cached rbio's pages? */ |
687 | if (bio_list_empty(&cur->bio_list) && | |
688 | list_empty(&cur->plug_list) && | |
689 | test_bit(RBIO_CACHE_BIT, &cur->flags) && | |
690 | !test_bit(RBIO_RMW_LOCKED_BIT, &cur->flags)) { | |
691 | list_del_init(&cur->hash_list); | |
692 | atomic_dec(&cur->refs); | |
693 | ||
694 | steal_rbio(cur, rbio); | |
695 | cache_drop = cur; | |
696 | spin_unlock(&cur->bio_list_lock); | |
697 | ||
698 | goto lockit; | |
699 | } | |
700 | ||
53b381b3 DW |
701 | /* can we merge into the lock owner? */ |
702 | if (rbio_can_merge(cur, rbio)) { | |
703 | merge_rbio(cur, rbio); | |
704 | spin_unlock(&cur->bio_list_lock); | |
705 | freeit = rbio; | |
706 | ret = 1; | |
707 | goto out; | |
708 | } | |
709 | ||
4ae10b3a | 710 | |
53b381b3 DW |
711 | /* |
712 | * we couldn't merge with the running | |
713 | * rbio, see if we can merge with the | |
714 | * pending ones. We don't have to | |
715 | * check for rmw_locked because there | |
716 | * is no way they are inside finish_rmw | |
717 | * right now | |
718 | */ | |
719 | list_for_each_entry(pending, &cur->plug_list, | |
720 | plug_list) { | |
721 | if (rbio_can_merge(pending, rbio)) { | |
722 | merge_rbio(pending, rbio); | |
723 | spin_unlock(&cur->bio_list_lock); | |
724 | freeit = rbio; | |
725 | ret = 1; | |
726 | goto out; | |
727 | } | |
728 | } | |
729 | ||
730 | /* no merging, put us on the tail of the plug list, | |
731 | * our rbio will be started with the currently | |
732 | * running rbio unlocks | |
733 | */ | |
734 | list_add_tail(&rbio->plug_list, &cur->plug_list); | |
735 | spin_unlock(&cur->bio_list_lock); | |
736 | ret = 1; | |
737 | goto out; | |
738 | } | |
739 | } | |
4ae10b3a | 740 | lockit: |
53b381b3 DW |
741 | atomic_inc(&rbio->refs); |
742 | list_add(&rbio->hash_list, &h->hash_list); | |
743 | out: | |
744 | spin_unlock_irqrestore(&h->lock, flags); | |
4ae10b3a CM |
745 | if (cache_drop) |
746 | remove_rbio_from_cache(cache_drop); | |
53b381b3 DW |
747 | if (freeit) |
748 | __free_raid_bio(freeit); | |
749 | return ret; | |
750 | } | |
751 | ||
752 | /* | |
753 | * called as rmw or parity rebuild is completed. If the plug list has more | |
754 | * rbios waiting for this stripe, the next one on the list will be started | |
755 | */ | |
756 | static noinline void unlock_stripe(struct btrfs_raid_bio *rbio) | |
757 | { | |
758 | int bucket; | |
759 | struct btrfs_stripe_hash *h; | |
760 | unsigned long flags; | |
4ae10b3a | 761 | int keep_cache = 0; |
53b381b3 DW |
762 | |
763 | bucket = rbio_bucket(rbio); | |
764 | h = rbio->fs_info->stripe_hash_table->table + bucket; | |
765 | ||
4ae10b3a CM |
766 | if (list_empty(&rbio->plug_list)) |
767 | cache_rbio(rbio); | |
768 | ||
53b381b3 DW |
769 | spin_lock_irqsave(&h->lock, flags); |
770 | spin_lock(&rbio->bio_list_lock); | |
771 | ||
772 | if (!list_empty(&rbio->hash_list)) { | |
4ae10b3a CM |
773 | /* |
774 | * if we're still cached and there is no other IO | |
775 | * to perform, just leave this rbio here for others | |
776 | * to steal from later | |
777 | */ | |
778 | if (list_empty(&rbio->plug_list) && | |
779 | test_bit(RBIO_CACHE_BIT, &rbio->flags)) { | |
780 | keep_cache = 1; | |
781 | clear_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags); | |
782 | BUG_ON(!bio_list_empty(&rbio->bio_list)); | |
783 | goto done; | |
784 | } | |
53b381b3 DW |
785 | |
786 | list_del_init(&rbio->hash_list); | |
787 | atomic_dec(&rbio->refs); | |
788 | ||
789 | /* | |
790 | * we use the plug list to hold all the rbios | |
791 | * waiting for the chance to lock this stripe. | |
792 | * hand the lock over to one of them. | |
793 | */ | |
794 | if (!list_empty(&rbio->plug_list)) { | |
795 | struct btrfs_raid_bio *next; | |
796 | struct list_head *head = rbio->plug_list.next; | |
797 | ||
798 | next = list_entry(head, struct btrfs_raid_bio, | |
799 | plug_list); | |
800 | ||
801 | list_del_init(&rbio->plug_list); | |
802 | ||
803 | list_add(&next->hash_list, &h->hash_list); | |
804 | atomic_inc(&next->refs); | |
805 | spin_unlock(&rbio->bio_list_lock); | |
806 | spin_unlock_irqrestore(&h->lock, flags); | |
807 | ||
1b94b556 | 808 | if (next->operation == BTRFS_RBIO_READ_REBUILD) |
53b381b3 | 809 | async_read_rebuild(next); |
b4ee1782 OS |
810 | else if (next->operation == BTRFS_RBIO_REBUILD_MISSING) { |
811 | steal_rbio(rbio, next); | |
812 | async_read_rebuild(next); | |
813 | } else if (next->operation == BTRFS_RBIO_WRITE) { | |
4ae10b3a | 814 | steal_rbio(rbio, next); |
53b381b3 | 815 | async_rmw_stripe(next); |
5a6ac9ea MX |
816 | } else if (next->operation == BTRFS_RBIO_PARITY_SCRUB) { |
817 | steal_rbio(rbio, next); | |
818 | async_scrub_parity(next); | |
4ae10b3a | 819 | } |
53b381b3 DW |
820 | |
821 | goto done_nolock; | |
33a9eca7 DS |
822 | /* |
823 | * The barrier for this waitqueue_active is not needed, | |
824 | * we're protected by h->lock and can't miss a wakeup. | |
825 | */ | |
826 | } else if (waitqueue_active(&h->wait)) { | |
53b381b3 DW |
827 | spin_unlock(&rbio->bio_list_lock); |
828 | spin_unlock_irqrestore(&h->lock, flags); | |
829 | wake_up(&h->wait); | |
830 | goto done_nolock; | |
831 | } | |
832 | } | |
4ae10b3a | 833 | done: |
53b381b3 DW |
834 | spin_unlock(&rbio->bio_list_lock); |
835 | spin_unlock_irqrestore(&h->lock, flags); | |
836 | ||
837 | done_nolock: | |
4ae10b3a CM |
838 | if (!keep_cache) |
839 | remove_rbio_from_cache(rbio); | |
53b381b3 DW |
840 | } |
841 | ||
842 | static void __free_raid_bio(struct btrfs_raid_bio *rbio) | |
843 | { | |
844 | int i; | |
845 | ||
846 | WARN_ON(atomic_read(&rbio->refs) < 0); | |
847 | if (!atomic_dec_and_test(&rbio->refs)) | |
848 | return; | |
849 | ||
4ae10b3a | 850 | WARN_ON(!list_empty(&rbio->stripe_cache)); |
53b381b3 DW |
851 | WARN_ON(!list_empty(&rbio->hash_list)); |
852 | WARN_ON(!bio_list_empty(&rbio->bio_list)); | |
853 | ||
854 | for (i = 0; i < rbio->nr_pages; i++) { | |
855 | if (rbio->stripe_pages[i]) { | |
856 | __free_page(rbio->stripe_pages[i]); | |
857 | rbio->stripe_pages[i] = NULL; | |
858 | } | |
859 | } | |
af8e2d1d | 860 | |
6e9606d2 | 861 | btrfs_put_bbio(rbio->bbio); |
53b381b3 DW |
862 | kfree(rbio); |
863 | } | |
864 | ||
865 | static void free_raid_bio(struct btrfs_raid_bio *rbio) | |
866 | { | |
867 | unlock_stripe(rbio); | |
868 | __free_raid_bio(rbio); | |
869 | } | |
870 | ||
871 | /* | |
872 | * this frees the rbio and runs through all the bios in the | |
873 | * bio_list and calls end_io on them | |
874 | */ | |
4246a0b6 | 875 | static void rbio_orig_end_io(struct btrfs_raid_bio *rbio, int err) |
53b381b3 DW |
876 | { |
877 | struct bio *cur = bio_list_get(&rbio->bio_list); | |
878 | struct bio *next; | |
4245215d MX |
879 | |
880 | if (rbio->generic_bio_cnt) | |
881 | btrfs_bio_counter_sub(rbio->fs_info, rbio->generic_bio_cnt); | |
882 | ||
53b381b3 DW |
883 | free_raid_bio(rbio); |
884 | ||
885 | while (cur) { | |
886 | next = cur->bi_next; | |
887 | cur->bi_next = NULL; | |
4246a0b6 CH |
888 | cur->bi_error = err; |
889 | bio_endio(cur); | |
53b381b3 DW |
890 | cur = next; |
891 | } | |
892 | } | |
893 | ||
894 | /* | |
895 | * end io function used by finish_rmw. When we finally | |
896 | * get here, we've written a full stripe | |
897 | */ | |
4246a0b6 | 898 | static void raid_write_end_io(struct bio *bio) |
53b381b3 DW |
899 | { |
900 | struct btrfs_raid_bio *rbio = bio->bi_private; | |
4246a0b6 | 901 | int err = bio->bi_error; |
a6111d11 | 902 | int max_errors; |
53b381b3 DW |
903 | |
904 | if (err) | |
905 | fail_bio_stripe(rbio, bio); | |
906 | ||
907 | bio_put(bio); | |
908 | ||
b89e1b01 | 909 | if (!atomic_dec_and_test(&rbio->stripes_pending)) |
53b381b3 DW |
910 | return; |
911 | ||
912 | err = 0; | |
913 | ||
914 | /* OK, we have read all the stripes we need to. */ | |
a6111d11 ZL |
915 | max_errors = (rbio->operation == BTRFS_RBIO_PARITY_SCRUB) ? |
916 | 0 : rbio->bbio->max_errors; | |
917 | if (atomic_read(&rbio->error) > max_errors) | |
53b381b3 DW |
918 | err = -EIO; |
919 | ||
4246a0b6 | 920 | rbio_orig_end_io(rbio, err); |
53b381b3 DW |
921 | } |
922 | ||
923 | /* | |
924 | * the read/modify/write code wants to use the original bio for | |
925 | * any pages it included, and then use the rbio for everything | |
926 | * else. This function decides if a given index (stripe number) | |
927 | * and page number in that stripe fall inside the original bio | |
928 | * or the rbio. | |
929 | * | |
930 | * if you set bio_list_only, you'll get a NULL back for any ranges | |
931 | * that are outside the bio_list | |
932 | * | |
933 | * This doesn't take any refs on anything, you get a bare page pointer | |
934 | * and the caller must bump refs as required. | |
935 | * | |
936 | * You must call index_rbio_pages once before you can trust | |
937 | * the answers from this function. | |
938 | */ | |
939 | static struct page *page_in_rbio(struct btrfs_raid_bio *rbio, | |
940 | int index, int pagenr, int bio_list_only) | |
941 | { | |
942 | int chunk_page; | |
943 | struct page *p = NULL; | |
944 | ||
945 | chunk_page = index * (rbio->stripe_len >> PAGE_SHIFT) + pagenr; | |
946 | ||
947 | spin_lock_irq(&rbio->bio_list_lock); | |
948 | p = rbio->bio_pages[chunk_page]; | |
949 | spin_unlock_irq(&rbio->bio_list_lock); | |
950 | ||
951 | if (p || bio_list_only) | |
952 | return p; | |
953 | ||
954 | return rbio->stripe_pages[chunk_page]; | |
955 | } | |
956 | ||
957 | /* | |
958 | * number of pages we need for the entire stripe across all the | |
959 | * drives | |
960 | */ | |
961 | static unsigned long rbio_nr_pages(unsigned long stripe_len, int nr_stripes) | |
962 | { | |
09cbfeaf | 963 | return DIV_ROUND_UP(stripe_len, PAGE_SIZE) * nr_stripes; |
53b381b3 DW |
964 | } |
965 | ||
966 | /* | |
967 | * allocation and initial setup for the btrfs_raid_bio. Not | |
968 | * this does not allocate any pages for rbio->pages. | |
969 | */ | |
2ff7e61e JM |
970 | static struct btrfs_raid_bio *alloc_rbio(struct btrfs_fs_info *fs_info, |
971 | struct btrfs_bio *bbio, | |
972 | u64 stripe_len) | |
53b381b3 DW |
973 | { |
974 | struct btrfs_raid_bio *rbio; | |
975 | int nr_data = 0; | |
2c8cdd6e MX |
976 | int real_stripes = bbio->num_stripes - bbio->num_tgtdevs; |
977 | int num_pages = rbio_nr_pages(stripe_len, real_stripes); | |
5a6ac9ea | 978 | int stripe_npages = DIV_ROUND_UP(stripe_len, PAGE_SIZE); |
53b381b3 DW |
979 | void *p; |
980 | ||
5a6ac9ea | 981 | rbio = kzalloc(sizeof(*rbio) + num_pages * sizeof(struct page *) * 2 + |
bfca9a6d ZL |
982 | DIV_ROUND_UP(stripe_npages, BITS_PER_LONG) * |
983 | sizeof(long), GFP_NOFS); | |
af8e2d1d | 984 | if (!rbio) |
53b381b3 | 985 | return ERR_PTR(-ENOMEM); |
53b381b3 DW |
986 | |
987 | bio_list_init(&rbio->bio_list); | |
988 | INIT_LIST_HEAD(&rbio->plug_list); | |
989 | spin_lock_init(&rbio->bio_list_lock); | |
4ae10b3a | 990 | INIT_LIST_HEAD(&rbio->stripe_cache); |
53b381b3 DW |
991 | INIT_LIST_HEAD(&rbio->hash_list); |
992 | rbio->bbio = bbio; | |
2ff7e61e | 993 | rbio->fs_info = fs_info; |
53b381b3 DW |
994 | rbio->stripe_len = stripe_len; |
995 | rbio->nr_pages = num_pages; | |
2c8cdd6e | 996 | rbio->real_stripes = real_stripes; |
5a6ac9ea | 997 | rbio->stripe_npages = stripe_npages; |
53b381b3 DW |
998 | rbio->faila = -1; |
999 | rbio->failb = -1; | |
1000 | atomic_set(&rbio->refs, 1); | |
b89e1b01 MX |
1001 | atomic_set(&rbio->error, 0); |
1002 | atomic_set(&rbio->stripes_pending, 0); | |
53b381b3 DW |
1003 | |
1004 | /* | |
1005 | * the stripe_pages and bio_pages array point to the extra | |
1006 | * memory we allocated past the end of the rbio | |
1007 | */ | |
1008 | p = rbio + 1; | |
1009 | rbio->stripe_pages = p; | |
1010 | rbio->bio_pages = p + sizeof(struct page *) * num_pages; | |
5a6ac9ea | 1011 | rbio->dbitmap = p + sizeof(struct page *) * num_pages * 2; |
53b381b3 | 1012 | |
10f11900 ZL |
1013 | if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5) |
1014 | nr_data = real_stripes - 1; | |
1015 | else if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID6) | |
2c8cdd6e | 1016 | nr_data = real_stripes - 2; |
53b381b3 | 1017 | else |
10f11900 | 1018 | BUG(); |
53b381b3 DW |
1019 | |
1020 | rbio->nr_data = nr_data; | |
1021 | return rbio; | |
1022 | } | |
1023 | ||
1024 | /* allocate pages for all the stripes in the bio, including parity */ | |
1025 | static int alloc_rbio_pages(struct btrfs_raid_bio *rbio) | |
1026 | { | |
1027 | int i; | |
1028 | struct page *page; | |
1029 | ||
1030 | for (i = 0; i < rbio->nr_pages; i++) { | |
1031 | if (rbio->stripe_pages[i]) | |
1032 | continue; | |
1033 | page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
1034 | if (!page) | |
1035 | return -ENOMEM; | |
1036 | rbio->stripe_pages[i] = page; | |
53b381b3 DW |
1037 | } |
1038 | return 0; | |
1039 | } | |
1040 | ||
b7178a5f | 1041 | /* only allocate pages for p/q stripes */ |
53b381b3 DW |
1042 | static int alloc_rbio_parity_pages(struct btrfs_raid_bio *rbio) |
1043 | { | |
1044 | int i; | |
1045 | struct page *page; | |
1046 | ||
b7178a5f | 1047 | i = rbio_stripe_page_index(rbio, rbio->nr_data, 0); |
53b381b3 DW |
1048 | |
1049 | for (; i < rbio->nr_pages; i++) { | |
1050 | if (rbio->stripe_pages[i]) | |
1051 | continue; | |
1052 | page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
1053 | if (!page) | |
1054 | return -ENOMEM; | |
1055 | rbio->stripe_pages[i] = page; | |
1056 | } | |
1057 | return 0; | |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * add a single page from a specific stripe into our list of bios for IO | |
1062 | * this will try to merge into existing bios if possible, and returns | |
1063 | * zero if all went well. | |
1064 | */ | |
48a3b636 ES |
1065 | static int rbio_add_io_page(struct btrfs_raid_bio *rbio, |
1066 | struct bio_list *bio_list, | |
1067 | struct page *page, | |
1068 | int stripe_nr, | |
1069 | unsigned long page_index, | |
1070 | unsigned long bio_max_len) | |
53b381b3 DW |
1071 | { |
1072 | struct bio *last = bio_list->tail; | |
1073 | u64 last_end = 0; | |
1074 | int ret; | |
1075 | struct bio *bio; | |
1076 | struct btrfs_bio_stripe *stripe; | |
1077 | u64 disk_start; | |
1078 | ||
1079 | stripe = &rbio->bbio->stripes[stripe_nr]; | |
09cbfeaf | 1080 | disk_start = stripe->physical + (page_index << PAGE_SHIFT); |
53b381b3 DW |
1081 | |
1082 | /* if the device is missing, just fail this stripe */ | |
1083 | if (!stripe->dev->bdev) | |
1084 | return fail_rbio_index(rbio, stripe_nr); | |
1085 | ||
1086 | /* see if we can add this page onto our existing bio */ | |
1087 | if (last) { | |
4f024f37 KO |
1088 | last_end = (u64)last->bi_iter.bi_sector << 9; |
1089 | last_end += last->bi_iter.bi_size; | |
53b381b3 DW |
1090 | |
1091 | /* | |
1092 | * we can't merge these if they are from different | |
1093 | * devices or if they are not contiguous | |
1094 | */ | |
1095 | if (last_end == disk_start && stripe->dev->bdev && | |
4246a0b6 | 1096 | !last->bi_error && |
53b381b3 | 1097 | last->bi_bdev == stripe->dev->bdev) { |
09cbfeaf KS |
1098 | ret = bio_add_page(last, page, PAGE_SIZE, 0); |
1099 | if (ret == PAGE_SIZE) | |
53b381b3 DW |
1100 | return 0; |
1101 | } | |
1102 | } | |
1103 | ||
1104 | /* put a new bio on the list */ | |
9be3395b | 1105 | bio = btrfs_io_bio_alloc(GFP_NOFS, bio_max_len >> PAGE_SHIFT?:1); |
53b381b3 DW |
1106 | if (!bio) |
1107 | return -ENOMEM; | |
1108 | ||
4f024f37 | 1109 | bio->bi_iter.bi_size = 0; |
53b381b3 | 1110 | bio->bi_bdev = stripe->dev->bdev; |
4f024f37 | 1111 | bio->bi_iter.bi_sector = disk_start >> 9; |
53b381b3 | 1112 | |
09cbfeaf | 1113 | bio_add_page(bio, page, PAGE_SIZE, 0); |
53b381b3 DW |
1114 | bio_list_add(bio_list, bio); |
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * while we're doing the read/modify/write cycle, we could | |
1120 | * have errors in reading pages off the disk. This checks | |
1121 | * for errors and if we're not able to read the page it'll | |
1122 | * trigger parity reconstruction. The rmw will be finished | |
1123 | * after we've reconstructed the failed stripes | |
1124 | */ | |
1125 | static void validate_rbio_for_rmw(struct btrfs_raid_bio *rbio) | |
1126 | { | |
1127 | if (rbio->faila >= 0 || rbio->failb >= 0) { | |
2c8cdd6e | 1128 | BUG_ON(rbio->faila == rbio->real_stripes - 1); |
53b381b3 DW |
1129 | __raid56_parity_recover(rbio); |
1130 | } else { | |
1131 | finish_rmw(rbio); | |
1132 | } | |
1133 | } | |
1134 | ||
53b381b3 DW |
1135 | /* |
1136 | * helper function to walk our bio list and populate the bio_pages array with | |
1137 | * the result. This seems expensive, but it is faster than constantly | |
1138 | * searching through the bio list as we setup the IO in finish_rmw or stripe | |
1139 | * reconstruction. | |
1140 | * | |
1141 | * This must be called before you trust the answers from page_in_rbio | |
1142 | */ | |
1143 | static void index_rbio_pages(struct btrfs_raid_bio *rbio) | |
1144 | { | |
1145 | struct bio *bio; | |
80ace3e4 | 1146 | struct bio_vec *bvec; |
53b381b3 DW |
1147 | u64 start; |
1148 | unsigned long stripe_offset; | |
1149 | unsigned long page_index; | |
53b381b3 DW |
1150 | int i; |
1151 | ||
1152 | spin_lock_irq(&rbio->bio_list_lock); | |
1153 | bio_list_for_each(bio, &rbio->bio_list) { | |
4f024f37 | 1154 | start = (u64)bio->bi_iter.bi_sector << 9; |
8e5cfb55 | 1155 | stripe_offset = start - rbio->bbio->raid_map[0]; |
09cbfeaf | 1156 | page_index = stripe_offset >> PAGE_SHIFT; |
53b381b3 | 1157 | |
80ace3e4 CH |
1158 | bio_for_each_segment_all(bvec, bio, i) |
1159 | rbio->bio_pages[page_index + i] = bvec->bv_page; | |
53b381b3 DW |
1160 | } |
1161 | spin_unlock_irq(&rbio->bio_list_lock); | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * this is called from one of two situations. We either | |
1166 | * have a full stripe from the higher layers, or we've read all | |
1167 | * the missing bits off disk. | |
1168 | * | |
1169 | * This will calculate the parity and then send down any | |
1170 | * changed blocks. | |
1171 | */ | |
1172 | static noinline void finish_rmw(struct btrfs_raid_bio *rbio) | |
1173 | { | |
1174 | struct btrfs_bio *bbio = rbio->bbio; | |
2c8cdd6e | 1175 | void *pointers[rbio->real_stripes]; |
53b381b3 DW |
1176 | int nr_data = rbio->nr_data; |
1177 | int stripe; | |
1178 | int pagenr; | |
1179 | int p_stripe = -1; | |
1180 | int q_stripe = -1; | |
1181 | struct bio_list bio_list; | |
1182 | struct bio *bio; | |
53b381b3 DW |
1183 | int ret; |
1184 | ||
1185 | bio_list_init(&bio_list); | |
1186 | ||
2c8cdd6e MX |
1187 | if (rbio->real_stripes - rbio->nr_data == 1) { |
1188 | p_stripe = rbio->real_stripes - 1; | |
1189 | } else if (rbio->real_stripes - rbio->nr_data == 2) { | |
1190 | p_stripe = rbio->real_stripes - 2; | |
1191 | q_stripe = rbio->real_stripes - 1; | |
53b381b3 DW |
1192 | } else { |
1193 | BUG(); | |
1194 | } | |
1195 | ||
1196 | /* at this point we either have a full stripe, | |
1197 | * or we've read the full stripe from the drive. | |
1198 | * recalculate the parity and write the new results. | |
1199 | * | |
1200 | * We're not allowed to add any new bios to the | |
1201 | * bio list here, anyone else that wants to | |
1202 | * change this stripe needs to do their own rmw. | |
1203 | */ | |
1204 | spin_lock_irq(&rbio->bio_list_lock); | |
1205 | set_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags); | |
1206 | spin_unlock_irq(&rbio->bio_list_lock); | |
1207 | ||
b89e1b01 | 1208 | atomic_set(&rbio->error, 0); |
53b381b3 DW |
1209 | |
1210 | /* | |
1211 | * now that we've set rmw_locked, run through the | |
1212 | * bio list one last time and map the page pointers | |
4ae10b3a CM |
1213 | * |
1214 | * We don't cache full rbios because we're assuming | |
1215 | * the higher layers are unlikely to use this area of | |
1216 | * the disk again soon. If they do use it again, | |
1217 | * hopefully they will send another full bio. | |
53b381b3 DW |
1218 | */ |
1219 | index_rbio_pages(rbio); | |
4ae10b3a CM |
1220 | if (!rbio_is_full(rbio)) |
1221 | cache_rbio_pages(rbio); | |
1222 | else | |
1223 | clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags); | |
53b381b3 | 1224 | |
915e2290 | 1225 | for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) { |
53b381b3 DW |
1226 | struct page *p; |
1227 | /* first collect one page from each data stripe */ | |
1228 | for (stripe = 0; stripe < nr_data; stripe++) { | |
1229 | p = page_in_rbio(rbio, stripe, pagenr, 0); | |
1230 | pointers[stripe] = kmap(p); | |
1231 | } | |
1232 | ||
1233 | /* then add the parity stripe */ | |
1234 | p = rbio_pstripe_page(rbio, pagenr); | |
1235 | SetPageUptodate(p); | |
1236 | pointers[stripe++] = kmap(p); | |
1237 | ||
1238 | if (q_stripe != -1) { | |
1239 | ||
1240 | /* | |
1241 | * raid6, add the qstripe and call the | |
1242 | * library function to fill in our p/q | |
1243 | */ | |
1244 | p = rbio_qstripe_page(rbio, pagenr); | |
1245 | SetPageUptodate(p); | |
1246 | pointers[stripe++] = kmap(p); | |
1247 | ||
2c8cdd6e | 1248 | raid6_call.gen_syndrome(rbio->real_stripes, PAGE_SIZE, |
53b381b3 DW |
1249 | pointers); |
1250 | } else { | |
1251 | /* raid5 */ | |
1252 | memcpy(pointers[nr_data], pointers[0], PAGE_SIZE); | |
09cbfeaf | 1253 | run_xor(pointers + 1, nr_data - 1, PAGE_SIZE); |
53b381b3 DW |
1254 | } |
1255 | ||
1256 | ||
2c8cdd6e | 1257 | for (stripe = 0; stripe < rbio->real_stripes; stripe++) |
53b381b3 DW |
1258 | kunmap(page_in_rbio(rbio, stripe, pagenr, 0)); |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * time to start writing. Make bios for everything from the | |
1263 | * higher layers (the bio_list in our rbio) and our p/q. Ignore | |
1264 | * everything else. | |
1265 | */ | |
2c8cdd6e | 1266 | for (stripe = 0; stripe < rbio->real_stripes; stripe++) { |
915e2290 | 1267 | for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) { |
53b381b3 DW |
1268 | struct page *page; |
1269 | if (stripe < rbio->nr_data) { | |
1270 | page = page_in_rbio(rbio, stripe, pagenr, 1); | |
1271 | if (!page) | |
1272 | continue; | |
1273 | } else { | |
1274 | page = rbio_stripe_page(rbio, stripe, pagenr); | |
1275 | } | |
1276 | ||
1277 | ret = rbio_add_io_page(rbio, &bio_list, | |
1278 | page, stripe, pagenr, rbio->stripe_len); | |
1279 | if (ret) | |
1280 | goto cleanup; | |
1281 | } | |
1282 | } | |
1283 | ||
2c8cdd6e MX |
1284 | if (likely(!bbio->num_tgtdevs)) |
1285 | goto write_data; | |
1286 | ||
1287 | for (stripe = 0; stripe < rbio->real_stripes; stripe++) { | |
1288 | if (!bbio->tgtdev_map[stripe]) | |
1289 | continue; | |
1290 | ||
915e2290 | 1291 | for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) { |
2c8cdd6e MX |
1292 | struct page *page; |
1293 | if (stripe < rbio->nr_data) { | |
1294 | page = page_in_rbio(rbio, stripe, pagenr, 1); | |
1295 | if (!page) | |
1296 | continue; | |
1297 | } else { | |
1298 | page = rbio_stripe_page(rbio, stripe, pagenr); | |
1299 | } | |
1300 | ||
1301 | ret = rbio_add_io_page(rbio, &bio_list, page, | |
1302 | rbio->bbio->tgtdev_map[stripe], | |
1303 | pagenr, rbio->stripe_len); | |
1304 | if (ret) | |
1305 | goto cleanup; | |
1306 | } | |
1307 | } | |
1308 | ||
1309 | write_data: | |
b89e1b01 MX |
1310 | atomic_set(&rbio->stripes_pending, bio_list_size(&bio_list)); |
1311 | BUG_ON(atomic_read(&rbio->stripes_pending) == 0); | |
53b381b3 DW |
1312 | |
1313 | while (1) { | |
1314 | bio = bio_list_pop(&bio_list); | |
1315 | if (!bio) | |
1316 | break; | |
1317 | ||
1318 | bio->bi_private = rbio; | |
1319 | bio->bi_end_io = raid_write_end_io; | |
37226b21 | 1320 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
4e49ea4a MC |
1321 | |
1322 | submit_bio(bio); | |
53b381b3 DW |
1323 | } |
1324 | return; | |
1325 | ||
1326 | cleanup: | |
4246a0b6 | 1327 | rbio_orig_end_io(rbio, -EIO); |
53b381b3 DW |
1328 | } |
1329 | ||
1330 | /* | |
1331 | * helper to find the stripe number for a given bio. Used to figure out which | |
1332 | * stripe has failed. This expects the bio to correspond to a physical disk, | |
1333 | * so it looks up based on physical sector numbers. | |
1334 | */ | |
1335 | static int find_bio_stripe(struct btrfs_raid_bio *rbio, | |
1336 | struct bio *bio) | |
1337 | { | |
4f024f37 | 1338 | u64 physical = bio->bi_iter.bi_sector; |
53b381b3 DW |
1339 | u64 stripe_start; |
1340 | int i; | |
1341 | struct btrfs_bio_stripe *stripe; | |
1342 | ||
1343 | physical <<= 9; | |
1344 | ||
1345 | for (i = 0; i < rbio->bbio->num_stripes; i++) { | |
1346 | stripe = &rbio->bbio->stripes[i]; | |
1347 | stripe_start = stripe->physical; | |
1348 | if (physical >= stripe_start && | |
2c8cdd6e MX |
1349 | physical < stripe_start + rbio->stripe_len && |
1350 | bio->bi_bdev == stripe->dev->bdev) { | |
53b381b3 DW |
1351 | return i; |
1352 | } | |
1353 | } | |
1354 | return -1; | |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * helper to find the stripe number for a given | |
1359 | * bio (before mapping). Used to figure out which stripe has | |
1360 | * failed. This looks up based on logical block numbers. | |
1361 | */ | |
1362 | static int find_logical_bio_stripe(struct btrfs_raid_bio *rbio, | |
1363 | struct bio *bio) | |
1364 | { | |
4f024f37 | 1365 | u64 logical = bio->bi_iter.bi_sector; |
53b381b3 DW |
1366 | u64 stripe_start; |
1367 | int i; | |
1368 | ||
1369 | logical <<= 9; | |
1370 | ||
1371 | for (i = 0; i < rbio->nr_data; i++) { | |
8e5cfb55 | 1372 | stripe_start = rbio->bbio->raid_map[i]; |
53b381b3 DW |
1373 | if (logical >= stripe_start && |
1374 | logical < stripe_start + rbio->stripe_len) { | |
1375 | return i; | |
1376 | } | |
1377 | } | |
1378 | return -1; | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | * returns -EIO if we had too many failures | |
1383 | */ | |
1384 | static int fail_rbio_index(struct btrfs_raid_bio *rbio, int failed) | |
1385 | { | |
1386 | unsigned long flags; | |
1387 | int ret = 0; | |
1388 | ||
1389 | spin_lock_irqsave(&rbio->bio_list_lock, flags); | |
1390 | ||
1391 | /* we already know this stripe is bad, move on */ | |
1392 | if (rbio->faila == failed || rbio->failb == failed) | |
1393 | goto out; | |
1394 | ||
1395 | if (rbio->faila == -1) { | |
1396 | /* first failure on this rbio */ | |
1397 | rbio->faila = failed; | |
b89e1b01 | 1398 | atomic_inc(&rbio->error); |
53b381b3 DW |
1399 | } else if (rbio->failb == -1) { |
1400 | /* second failure on this rbio */ | |
1401 | rbio->failb = failed; | |
b89e1b01 | 1402 | atomic_inc(&rbio->error); |
53b381b3 DW |
1403 | } else { |
1404 | ret = -EIO; | |
1405 | } | |
1406 | out: | |
1407 | spin_unlock_irqrestore(&rbio->bio_list_lock, flags); | |
1408 | ||
1409 | return ret; | |
1410 | } | |
1411 | ||
1412 | /* | |
1413 | * helper to fail a stripe based on a physical disk | |
1414 | * bio. | |
1415 | */ | |
1416 | static int fail_bio_stripe(struct btrfs_raid_bio *rbio, | |
1417 | struct bio *bio) | |
1418 | { | |
1419 | int failed = find_bio_stripe(rbio, bio); | |
1420 | ||
1421 | if (failed < 0) | |
1422 | return -EIO; | |
1423 | ||
1424 | return fail_rbio_index(rbio, failed); | |
1425 | } | |
1426 | ||
1427 | /* | |
1428 | * this sets each page in the bio uptodate. It should only be used on private | |
1429 | * rbio pages, nothing that comes in from the higher layers | |
1430 | */ | |
1431 | static void set_bio_pages_uptodate(struct bio *bio) | |
1432 | { | |
80ace3e4 | 1433 | struct bio_vec *bvec; |
53b381b3 | 1434 | int i; |
53b381b3 | 1435 | |
80ace3e4 CH |
1436 | bio_for_each_segment_all(bvec, bio, i) |
1437 | SetPageUptodate(bvec->bv_page); | |
53b381b3 DW |
1438 | } |
1439 | ||
1440 | /* | |
1441 | * end io for the read phase of the rmw cycle. All the bios here are physical | |
1442 | * stripe bios we've read from the disk so we can recalculate the parity of the | |
1443 | * stripe. | |
1444 | * | |
1445 | * This will usually kick off finish_rmw once all the bios are read in, but it | |
1446 | * may trigger parity reconstruction if we had any errors along the way | |
1447 | */ | |
4246a0b6 | 1448 | static void raid_rmw_end_io(struct bio *bio) |
53b381b3 DW |
1449 | { |
1450 | struct btrfs_raid_bio *rbio = bio->bi_private; | |
1451 | ||
4246a0b6 | 1452 | if (bio->bi_error) |
53b381b3 DW |
1453 | fail_bio_stripe(rbio, bio); |
1454 | else | |
1455 | set_bio_pages_uptodate(bio); | |
1456 | ||
1457 | bio_put(bio); | |
1458 | ||
b89e1b01 | 1459 | if (!atomic_dec_and_test(&rbio->stripes_pending)) |
53b381b3 DW |
1460 | return; |
1461 | ||
b89e1b01 | 1462 | if (atomic_read(&rbio->error) > rbio->bbio->max_errors) |
53b381b3 DW |
1463 | goto cleanup; |
1464 | ||
1465 | /* | |
1466 | * this will normally call finish_rmw to start our write | |
1467 | * but if there are any failed stripes we'll reconstruct | |
1468 | * from parity first | |
1469 | */ | |
1470 | validate_rbio_for_rmw(rbio); | |
1471 | return; | |
1472 | ||
1473 | cleanup: | |
1474 | ||
4246a0b6 | 1475 | rbio_orig_end_io(rbio, -EIO); |
53b381b3 DW |
1476 | } |
1477 | ||
1478 | static void async_rmw_stripe(struct btrfs_raid_bio *rbio) | |
1479 | { | |
0b246afa JM |
1480 | btrfs_init_work(&rbio->work, btrfs_rmw_helper, rmw_work, NULL, NULL); |
1481 | btrfs_queue_work(rbio->fs_info->rmw_workers, &rbio->work); | |
53b381b3 DW |
1482 | } |
1483 | ||
1484 | static void async_read_rebuild(struct btrfs_raid_bio *rbio) | |
1485 | { | |
9e0af237 LB |
1486 | btrfs_init_work(&rbio->work, btrfs_rmw_helper, |
1487 | read_rebuild_work, NULL, NULL); | |
53b381b3 | 1488 | |
0b246afa | 1489 | btrfs_queue_work(rbio->fs_info->rmw_workers, &rbio->work); |
53b381b3 DW |
1490 | } |
1491 | ||
1492 | /* | |
1493 | * the stripe must be locked by the caller. It will | |
1494 | * unlock after all the writes are done | |
1495 | */ | |
1496 | static int raid56_rmw_stripe(struct btrfs_raid_bio *rbio) | |
1497 | { | |
1498 | int bios_to_read = 0; | |
53b381b3 DW |
1499 | struct bio_list bio_list; |
1500 | int ret; | |
53b381b3 DW |
1501 | int pagenr; |
1502 | int stripe; | |
1503 | struct bio *bio; | |
1504 | ||
1505 | bio_list_init(&bio_list); | |
1506 | ||
1507 | ret = alloc_rbio_pages(rbio); | |
1508 | if (ret) | |
1509 | goto cleanup; | |
1510 | ||
1511 | index_rbio_pages(rbio); | |
1512 | ||
b89e1b01 | 1513 | atomic_set(&rbio->error, 0); |
53b381b3 DW |
1514 | /* |
1515 | * build a list of bios to read all the missing parts of this | |
1516 | * stripe | |
1517 | */ | |
1518 | for (stripe = 0; stripe < rbio->nr_data; stripe++) { | |
915e2290 | 1519 | for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) { |
53b381b3 DW |
1520 | struct page *page; |
1521 | /* | |
1522 | * we want to find all the pages missing from | |
1523 | * the rbio and read them from the disk. If | |
1524 | * page_in_rbio finds a page in the bio list | |
1525 | * we don't need to read it off the stripe. | |
1526 | */ | |
1527 | page = page_in_rbio(rbio, stripe, pagenr, 1); | |
1528 | if (page) | |
1529 | continue; | |
1530 | ||
1531 | page = rbio_stripe_page(rbio, stripe, pagenr); | |
4ae10b3a CM |
1532 | /* |
1533 | * the bio cache may have handed us an uptodate | |
1534 | * page. If so, be happy and use it | |
1535 | */ | |
1536 | if (PageUptodate(page)) | |
1537 | continue; | |
1538 | ||
53b381b3 DW |
1539 | ret = rbio_add_io_page(rbio, &bio_list, page, |
1540 | stripe, pagenr, rbio->stripe_len); | |
1541 | if (ret) | |
1542 | goto cleanup; | |
1543 | } | |
1544 | } | |
1545 | ||
1546 | bios_to_read = bio_list_size(&bio_list); | |
1547 | if (!bios_to_read) { | |
1548 | /* | |
1549 | * this can happen if others have merged with | |
1550 | * us, it means there is nothing left to read. | |
1551 | * But if there are missing devices it may not be | |
1552 | * safe to do the full stripe write yet. | |
1553 | */ | |
1554 | goto finish; | |
1555 | } | |
1556 | ||
1557 | /* | |
1558 | * the bbio may be freed once we submit the last bio. Make sure | |
1559 | * not to touch it after that | |
1560 | */ | |
b89e1b01 | 1561 | atomic_set(&rbio->stripes_pending, bios_to_read); |
53b381b3 DW |
1562 | while (1) { |
1563 | bio = bio_list_pop(&bio_list); | |
1564 | if (!bio) | |
1565 | break; | |
1566 | ||
1567 | bio->bi_private = rbio; | |
1568 | bio->bi_end_io = raid_rmw_end_io; | |
37226b21 | 1569 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
53b381b3 | 1570 | |
0b246afa | 1571 | btrfs_bio_wq_end_io(rbio->fs_info, bio, BTRFS_WQ_ENDIO_RAID56); |
53b381b3 | 1572 | |
4e49ea4a | 1573 | submit_bio(bio); |
53b381b3 DW |
1574 | } |
1575 | /* the actual write will happen once the reads are done */ | |
1576 | return 0; | |
1577 | ||
1578 | cleanup: | |
4246a0b6 | 1579 | rbio_orig_end_io(rbio, -EIO); |
53b381b3 DW |
1580 | return -EIO; |
1581 | ||
1582 | finish: | |
1583 | validate_rbio_for_rmw(rbio); | |
1584 | return 0; | |
1585 | } | |
1586 | ||
1587 | /* | |
1588 | * if the upper layers pass in a full stripe, we thank them by only allocating | |
1589 | * enough pages to hold the parity, and sending it all down quickly. | |
1590 | */ | |
1591 | static int full_stripe_write(struct btrfs_raid_bio *rbio) | |
1592 | { | |
1593 | int ret; | |
1594 | ||
1595 | ret = alloc_rbio_parity_pages(rbio); | |
3cd846d1 MX |
1596 | if (ret) { |
1597 | __free_raid_bio(rbio); | |
53b381b3 | 1598 | return ret; |
3cd846d1 | 1599 | } |
53b381b3 DW |
1600 | |
1601 | ret = lock_stripe_add(rbio); | |
1602 | if (ret == 0) | |
1603 | finish_rmw(rbio); | |
1604 | return 0; | |
1605 | } | |
1606 | ||
1607 | /* | |
1608 | * partial stripe writes get handed over to async helpers. | |
1609 | * We're really hoping to merge a few more writes into this | |
1610 | * rbio before calculating new parity | |
1611 | */ | |
1612 | static int partial_stripe_write(struct btrfs_raid_bio *rbio) | |
1613 | { | |
1614 | int ret; | |
1615 | ||
1616 | ret = lock_stripe_add(rbio); | |
1617 | if (ret == 0) | |
1618 | async_rmw_stripe(rbio); | |
1619 | return 0; | |
1620 | } | |
1621 | ||
1622 | /* | |
1623 | * sometimes while we were reading from the drive to | |
1624 | * recalculate parity, enough new bios come into create | |
1625 | * a full stripe. So we do a check here to see if we can | |
1626 | * go directly to finish_rmw | |
1627 | */ | |
1628 | static int __raid56_parity_write(struct btrfs_raid_bio *rbio) | |
1629 | { | |
1630 | /* head off into rmw land if we don't have a full stripe */ | |
1631 | if (!rbio_is_full(rbio)) | |
1632 | return partial_stripe_write(rbio); | |
1633 | return full_stripe_write(rbio); | |
1634 | } | |
1635 | ||
6ac0f488 CM |
1636 | /* |
1637 | * We use plugging call backs to collect full stripes. | |
1638 | * Any time we get a partial stripe write while plugged | |
1639 | * we collect it into a list. When the unplug comes down, | |
1640 | * we sort the list by logical block number and merge | |
1641 | * everything we can into the same rbios | |
1642 | */ | |
1643 | struct btrfs_plug_cb { | |
1644 | struct blk_plug_cb cb; | |
1645 | struct btrfs_fs_info *info; | |
1646 | struct list_head rbio_list; | |
1647 | struct btrfs_work work; | |
1648 | }; | |
1649 | ||
1650 | /* | |
1651 | * rbios on the plug list are sorted for easier merging. | |
1652 | */ | |
1653 | static int plug_cmp(void *priv, struct list_head *a, struct list_head *b) | |
1654 | { | |
1655 | struct btrfs_raid_bio *ra = container_of(a, struct btrfs_raid_bio, | |
1656 | plug_list); | |
1657 | struct btrfs_raid_bio *rb = container_of(b, struct btrfs_raid_bio, | |
1658 | plug_list); | |
4f024f37 KO |
1659 | u64 a_sector = ra->bio_list.head->bi_iter.bi_sector; |
1660 | u64 b_sector = rb->bio_list.head->bi_iter.bi_sector; | |
6ac0f488 CM |
1661 | |
1662 | if (a_sector < b_sector) | |
1663 | return -1; | |
1664 | if (a_sector > b_sector) | |
1665 | return 1; | |
1666 | return 0; | |
1667 | } | |
1668 | ||
1669 | static void run_plug(struct btrfs_plug_cb *plug) | |
1670 | { | |
1671 | struct btrfs_raid_bio *cur; | |
1672 | struct btrfs_raid_bio *last = NULL; | |
1673 | ||
1674 | /* | |
1675 | * sort our plug list then try to merge | |
1676 | * everything we can in hopes of creating full | |
1677 | * stripes. | |
1678 | */ | |
1679 | list_sort(NULL, &plug->rbio_list, plug_cmp); | |
1680 | while (!list_empty(&plug->rbio_list)) { | |
1681 | cur = list_entry(plug->rbio_list.next, | |
1682 | struct btrfs_raid_bio, plug_list); | |
1683 | list_del_init(&cur->plug_list); | |
1684 | ||
1685 | if (rbio_is_full(cur)) { | |
1686 | /* we have a full stripe, send it down */ | |
1687 | full_stripe_write(cur); | |
1688 | continue; | |
1689 | } | |
1690 | if (last) { | |
1691 | if (rbio_can_merge(last, cur)) { | |
1692 | merge_rbio(last, cur); | |
1693 | __free_raid_bio(cur); | |
1694 | continue; | |
1695 | ||
1696 | } | |
1697 | __raid56_parity_write(last); | |
1698 | } | |
1699 | last = cur; | |
1700 | } | |
1701 | if (last) { | |
1702 | __raid56_parity_write(last); | |
1703 | } | |
1704 | kfree(plug); | |
1705 | } | |
1706 | ||
1707 | /* | |
1708 | * if the unplug comes from schedule, we have to push the | |
1709 | * work off to a helper thread | |
1710 | */ | |
1711 | static void unplug_work(struct btrfs_work *work) | |
1712 | { | |
1713 | struct btrfs_plug_cb *plug; | |
1714 | plug = container_of(work, struct btrfs_plug_cb, work); | |
1715 | run_plug(plug); | |
1716 | } | |
1717 | ||
1718 | static void btrfs_raid_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
1719 | { | |
1720 | struct btrfs_plug_cb *plug; | |
1721 | plug = container_of(cb, struct btrfs_plug_cb, cb); | |
1722 | ||
1723 | if (from_schedule) { | |
9e0af237 LB |
1724 | btrfs_init_work(&plug->work, btrfs_rmw_helper, |
1725 | unplug_work, NULL, NULL); | |
d05a33ac QW |
1726 | btrfs_queue_work(plug->info->rmw_workers, |
1727 | &plug->work); | |
6ac0f488 CM |
1728 | return; |
1729 | } | |
1730 | run_plug(plug); | |
1731 | } | |
1732 | ||
53b381b3 DW |
1733 | /* |
1734 | * our main entry point for writes from the rest of the FS. | |
1735 | */ | |
2ff7e61e | 1736 | int raid56_parity_write(struct btrfs_fs_info *fs_info, struct bio *bio, |
8e5cfb55 | 1737 | struct btrfs_bio *bbio, u64 stripe_len) |
53b381b3 DW |
1738 | { |
1739 | struct btrfs_raid_bio *rbio; | |
6ac0f488 CM |
1740 | struct btrfs_plug_cb *plug = NULL; |
1741 | struct blk_plug_cb *cb; | |
4245215d | 1742 | int ret; |
53b381b3 | 1743 | |
2ff7e61e | 1744 | rbio = alloc_rbio(fs_info, bbio, stripe_len); |
af8e2d1d | 1745 | if (IS_ERR(rbio)) { |
6e9606d2 | 1746 | btrfs_put_bbio(bbio); |
53b381b3 | 1747 | return PTR_ERR(rbio); |
af8e2d1d | 1748 | } |
53b381b3 | 1749 | bio_list_add(&rbio->bio_list, bio); |
4f024f37 | 1750 | rbio->bio_list_bytes = bio->bi_iter.bi_size; |
1b94b556 | 1751 | rbio->operation = BTRFS_RBIO_WRITE; |
6ac0f488 | 1752 | |
0b246afa | 1753 | btrfs_bio_counter_inc_noblocked(fs_info); |
4245215d MX |
1754 | rbio->generic_bio_cnt = 1; |
1755 | ||
6ac0f488 CM |
1756 | /* |
1757 | * don't plug on full rbios, just get them out the door | |
1758 | * as quickly as we can | |
1759 | */ | |
4245215d MX |
1760 | if (rbio_is_full(rbio)) { |
1761 | ret = full_stripe_write(rbio); | |
1762 | if (ret) | |
0b246afa | 1763 | btrfs_bio_counter_dec(fs_info); |
4245215d MX |
1764 | return ret; |
1765 | } | |
6ac0f488 | 1766 | |
0b246afa | 1767 | cb = blk_check_plugged(btrfs_raid_unplug, fs_info, sizeof(*plug)); |
6ac0f488 CM |
1768 | if (cb) { |
1769 | plug = container_of(cb, struct btrfs_plug_cb, cb); | |
1770 | if (!plug->info) { | |
0b246afa | 1771 | plug->info = fs_info; |
6ac0f488 CM |
1772 | INIT_LIST_HEAD(&plug->rbio_list); |
1773 | } | |
1774 | list_add_tail(&rbio->plug_list, &plug->rbio_list); | |
4245215d | 1775 | ret = 0; |
6ac0f488 | 1776 | } else { |
4245215d MX |
1777 | ret = __raid56_parity_write(rbio); |
1778 | if (ret) | |
0b246afa | 1779 | btrfs_bio_counter_dec(fs_info); |
6ac0f488 | 1780 | } |
4245215d | 1781 | return ret; |
53b381b3 DW |
1782 | } |
1783 | ||
1784 | /* | |
1785 | * all parity reconstruction happens here. We've read in everything | |
1786 | * we can find from the drives and this does the heavy lifting of | |
1787 | * sorting the good from the bad. | |
1788 | */ | |
1789 | static void __raid_recover_end_io(struct btrfs_raid_bio *rbio) | |
1790 | { | |
1791 | int pagenr, stripe; | |
1792 | void **pointers; | |
1793 | int faila = -1, failb = -1; | |
53b381b3 DW |
1794 | struct page *page; |
1795 | int err; | |
1796 | int i; | |
1797 | ||
31e818fe | 1798 | pointers = kcalloc(rbio->real_stripes, sizeof(void *), GFP_NOFS); |
53b381b3 DW |
1799 | if (!pointers) { |
1800 | err = -ENOMEM; | |
1801 | goto cleanup_io; | |
1802 | } | |
1803 | ||
1804 | faila = rbio->faila; | |
1805 | failb = rbio->failb; | |
1806 | ||
b4ee1782 OS |
1807 | if (rbio->operation == BTRFS_RBIO_READ_REBUILD || |
1808 | rbio->operation == BTRFS_RBIO_REBUILD_MISSING) { | |
53b381b3 DW |
1809 | spin_lock_irq(&rbio->bio_list_lock); |
1810 | set_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags); | |
1811 | spin_unlock_irq(&rbio->bio_list_lock); | |
1812 | } | |
1813 | ||
1814 | index_rbio_pages(rbio); | |
1815 | ||
915e2290 | 1816 | for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) { |
5a6ac9ea MX |
1817 | /* |
1818 | * Now we just use bitmap to mark the horizontal stripes in | |
1819 | * which we have data when doing parity scrub. | |
1820 | */ | |
1821 | if (rbio->operation == BTRFS_RBIO_PARITY_SCRUB && | |
1822 | !test_bit(pagenr, rbio->dbitmap)) | |
1823 | continue; | |
1824 | ||
53b381b3 DW |
1825 | /* setup our array of pointers with pages |
1826 | * from each stripe | |
1827 | */ | |
2c8cdd6e | 1828 | for (stripe = 0; stripe < rbio->real_stripes; stripe++) { |
53b381b3 DW |
1829 | /* |
1830 | * if we're rebuilding a read, we have to use | |
1831 | * pages from the bio list | |
1832 | */ | |
b4ee1782 OS |
1833 | if ((rbio->operation == BTRFS_RBIO_READ_REBUILD || |
1834 | rbio->operation == BTRFS_RBIO_REBUILD_MISSING) && | |
53b381b3 DW |
1835 | (stripe == faila || stripe == failb)) { |
1836 | page = page_in_rbio(rbio, stripe, pagenr, 0); | |
1837 | } else { | |
1838 | page = rbio_stripe_page(rbio, stripe, pagenr); | |
1839 | } | |
1840 | pointers[stripe] = kmap(page); | |
1841 | } | |
1842 | ||
1843 | /* all raid6 handling here */ | |
10f11900 | 1844 | if (rbio->bbio->map_type & BTRFS_BLOCK_GROUP_RAID6) { |
53b381b3 DW |
1845 | /* |
1846 | * single failure, rebuild from parity raid5 | |
1847 | * style | |
1848 | */ | |
1849 | if (failb < 0) { | |
1850 | if (faila == rbio->nr_data) { | |
1851 | /* | |
1852 | * Just the P stripe has failed, without | |
1853 | * a bad data or Q stripe. | |
1854 | * TODO, we should redo the xor here. | |
1855 | */ | |
1856 | err = -EIO; | |
1857 | goto cleanup; | |
1858 | } | |
1859 | /* | |
1860 | * a single failure in raid6 is rebuilt | |
1861 | * in the pstripe code below | |
1862 | */ | |
1863 | goto pstripe; | |
1864 | } | |
1865 | ||
1866 | /* make sure our ps and qs are in order */ | |
1867 | if (faila > failb) { | |
1868 | int tmp = failb; | |
1869 | failb = faila; | |
1870 | faila = tmp; | |
1871 | } | |
1872 | ||
1873 | /* if the q stripe is failed, do a pstripe reconstruction | |
1874 | * from the xors. | |
1875 | * If both the q stripe and the P stripe are failed, we're | |
1876 | * here due to a crc mismatch and we can't give them the | |
1877 | * data they want | |
1878 | */ | |
8e5cfb55 ZL |
1879 | if (rbio->bbio->raid_map[failb] == RAID6_Q_STRIPE) { |
1880 | if (rbio->bbio->raid_map[faila] == | |
1881 | RAID5_P_STRIPE) { | |
53b381b3 DW |
1882 | err = -EIO; |
1883 | goto cleanup; | |
1884 | } | |
1885 | /* | |
1886 | * otherwise we have one bad data stripe and | |
1887 | * a good P stripe. raid5! | |
1888 | */ | |
1889 | goto pstripe; | |
1890 | } | |
1891 | ||
8e5cfb55 | 1892 | if (rbio->bbio->raid_map[failb] == RAID5_P_STRIPE) { |
2c8cdd6e | 1893 | raid6_datap_recov(rbio->real_stripes, |
53b381b3 DW |
1894 | PAGE_SIZE, faila, pointers); |
1895 | } else { | |
2c8cdd6e | 1896 | raid6_2data_recov(rbio->real_stripes, |
53b381b3 DW |
1897 | PAGE_SIZE, faila, failb, |
1898 | pointers); | |
1899 | } | |
1900 | } else { | |
1901 | void *p; | |
1902 | ||
1903 | /* rebuild from P stripe here (raid5 or raid6) */ | |
1904 | BUG_ON(failb != -1); | |
1905 | pstripe: | |
1906 | /* Copy parity block into failed block to start with */ | |
1907 | memcpy(pointers[faila], | |
1908 | pointers[rbio->nr_data], | |
09cbfeaf | 1909 | PAGE_SIZE); |
53b381b3 DW |
1910 | |
1911 | /* rearrange the pointer array */ | |
1912 | p = pointers[faila]; | |
1913 | for (stripe = faila; stripe < rbio->nr_data - 1; stripe++) | |
1914 | pointers[stripe] = pointers[stripe + 1]; | |
1915 | pointers[rbio->nr_data - 1] = p; | |
1916 | ||
1917 | /* xor in the rest */ | |
09cbfeaf | 1918 | run_xor(pointers, rbio->nr_data - 1, PAGE_SIZE); |
53b381b3 DW |
1919 | } |
1920 | /* if we're doing this rebuild as part of an rmw, go through | |
1921 | * and set all of our private rbio pages in the | |
1922 | * failed stripes as uptodate. This way finish_rmw will | |
1923 | * know they can be trusted. If this was a read reconstruction, | |
1924 | * other endio functions will fiddle the uptodate bits | |
1925 | */ | |
1b94b556 | 1926 | if (rbio->operation == BTRFS_RBIO_WRITE) { |
915e2290 | 1927 | for (i = 0; i < rbio->stripe_npages; i++) { |
53b381b3 DW |
1928 | if (faila != -1) { |
1929 | page = rbio_stripe_page(rbio, faila, i); | |
1930 | SetPageUptodate(page); | |
1931 | } | |
1932 | if (failb != -1) { | |
1933 | page = rbio_stripe_page(rbio, failb, i); | |
1934 | SetPageUptodate(page); | |
1935 | } | |
1936 | } | |
1937 | } | |
2c8cdd6e | 1938 | for (stripe = 0; stripe < rbio->real_stripes; stripe++) { |
53b381b3 DW |
1939 | /* |
1940 | * if we're rebuilding a read, we have to use | |
1941 | * pages from the bio list | |
1942 | */ | |
b4ee1782 OS |
1943 | if ((rbio->operation == BTRFS_RBIO_READ_REBUILD || |
1944 | rbio->operation == BTRFS_RBIO_REBUILD_MISSING) && | |
53b381b3 DW |
1945 | (stripe == faila || stripe == failb)) { |
1946 | page = page_in_rbio(rbio, stripe, pagenr, 0); | |
1947 | } else { | |
1948 | page = rbio_stripe_page(rbio, stripe, pagenr); | |
1949 | } | |
1950 | kunmap(page); | |
1951 | } | |
1952 | } | |
1953 | ||
1954 | err = 0; | |
1955 | cleanup: | |
1956 | kfree(pointers); | |
1957 | ||
1958 | cleanup_io: | |
1b94b556 | 1959 | if (rbio->operation == BTRFS_RBIO_READ_REBUILD) { |
6e9606d2 | 1960 | if (err == 0) |
4ae10b3a CM |
1961 | cache_rbio_pages(rbio); |
1962 | else | |
1963 | clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags); | |
1964 | ||
22365979 | 1965 | rbio_orig_end_io(rbio, err); |
b4ee1782 | 1966 | } else if (rbio->operation == BTRFS_RBIO_REBUILD_MISSING) { |
4246a0b6 | 1967 | rbio_orig_end_io(rbio, err); |
53b381b3 DW |
1968 | } else if (err == 0) { |
1969 | rbio->faila = -1; | |
1970 | rbio->failb = -1; | |
5a6ac9ea MX |
1971 | |
1972 | if (rbio->operation == BTRFS_RBIO_WRITE) | |
1973 | finish_rmw(rbio); | |
1974 | else if (rbio->operation == BTRFS_RBIO_PARITY_SCRUB) | |
1975 | finish_parity_scrub(rbio, 0); | |
1976 | else | |
1977 | BUG(); | |
53b381b3 | 1978 | } else { |
4246a0b6 | 1979 | rbio_orig_end_io(rbio, err); |
53b381b3 DW |
1980 | } |
1981 | } | |
1982 | ||
1983 | /* | |
1984 | * This is called only for stripes we've read from disk to | |
1985 | * reconstruct the parity. | |
1986 | */ | |
4246a0b6 | 1987 | static void raid_recover_end_io(struct bio *bio) |
53b381b3 DW |
1988 | { |
1989 | struct btrfs_raid_bio *rbio = bio->bi_private; | |
1990 | ||
1991 | /* | |
1992 | * we only read stripe pages off the disk, set them | |
1993 | * up to date if there were no errors | |
1994 | */ | |
4246a0b6 | 1995 | if (bio->bi_error) |
53b381b3 DW |
1996 | fail_bio_stripe(rbio, bio); |
1997 | else | |
1998 | set_bio_pages_uptodate(bio); | |
1999 | bio_put(bio); | |
2000 | ||
b89e1b01 | 2001 | if (!atomic_dec_and_test(&rbio->stripes_pending)) |
53b381b3 DW |
2002 | return; |
2003 | ||
b89e1b01 | 2004 | if (atomic_read(&rbio->error) > rbio->bbio->max_errors) |
4246a0b6 | 2005 | rbio_orig_end_io(rbio, -EIO); |
53b381b3 DW |
2006 | else |
2007 | __raid_recover_end_io(rbio); | |
2008 | } | |
2009 | ||
2010 | /* | |
2011 | * reads everything we need off the disk to reconstruct | |
2012 | * the parity. endio handlers trigger final reconstruction | |
2013 | * when the IO is done. | |
2014 | * | |
2015 | * This is used both for reads from the higher layers and for | |
2016 | * parity construction required to finish a rmw cycle. | |
2017 | */ | |
2018 | static int __raid56_parity_recover(struct btrfs_raid_bio *rbio) | |
2019 | { | |
2020 | int bios_to_read = 0; | |
53b381b3 DW |
2021 | struct bio_list bio_list; |
2022 | int ret; | |
53b381b3 DW |
2023 | int pagenr; |
2024 | int stripe; | |
2025 | struct bio *bio; | |
2026 | ||
2027 | bio_list_init(&bio_list); | |
2028 | ||
2029 | ret = alloc_rbio_pages(rbio); | |
2030 | if (ret) | |
2031 | goto cleanup; | |
2032 | ||
b89e1b01 | 2033 | atomic_set(&rbio->error, 0); |
53b381b3 DW |
2034 | |
2035 | /* | |
4ae10b3a CM |
2036 | * read everything that hasn't failed. Thanks to the |
2037 | * stripe cache, it is possible that some or all of these | |
2038 | * pages are going to be uptodate. | |
53b381b3 | 2039 | */ |
2c8cdd6e | 2040 | for (stripe = 0; stripe < rbio->real_stripes; stripe++) { |
5588383e | 2041 | if (rbio->faila == stripe || rbio->failb == stripe) { |
b89e1b01 | 2042 | atomic_inc(&rbio->error); |
53b381b3 | 2043 | continue; |
5588383e | 2044 | } |
53b381b3 | 2045 | |
915e2290 | 2046 | for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) { |
53b381b3 DW |
2047 | struct page *p; |
2048 | ||
2049 | /* | |
2050 | * the rmw code may have already read this | |
2051 | * page in | |
2052 | */ | |
2053 | p = rbio_stripe_page(rbio, stripe, pagenr); | |
2054 | if (PageUptodate(p)) | |
2055 | continue; | |
2056 | ||
2057 | ret = rbio_add_io_page(rbio, &bio_list, | |
2058 | rbio_stripe_page(rbio, stripe, pagenr), | |
2059 | stripe, pagenr, rbio->stripe_len); | |
2060 | if (ret < 0) | |
2061 | goto cleanup; | |
2062 | } | |
2063 | } | |
2064 | ||
2065 | bios_to_read = bio_list_size(&bio_list); | |
2066 | if (!bios_to_read) { | |
2067 | /* | |
2068 | * we might have no bios to read just because the pages | |
2069 | * were up to date, or we might have no bios to read because | |
2070 | * the devices were gone. | |
2071 | */ | |
b89e1b01 | 2072 | if (atomic_read(&rbio->error) <= rbio->bbio->max_errors) { |
53b381b3 DW |
2073 | __raid_recover_end_io(rbio); |
2074 | goto out; | |
2075 | } else { | |
2076 | goto cleanup; | |
2077 | } | |
2078 | } | |
2079 | ||
2080 | /* | |
2081 | * the bbio may be freed once we submit the last bio. Make sure | |
2082 | * not to touch it after that | |
2083 | */ | |
b89e1b01 | 2084 | atomic_set(&rbio->stripes_pending, bios_to_read); |
53b381b3 DW |
2085 | while (1) { |
2086 | bio = bio_list_pop(&bio_list); | |
2087 | if (!bio) | |
2088 | break; | |
2089 | ||
2090 | bio->bi_private = rbio; | |
2091 | bio->bi_end_io = raid_recover_end_io; | |
37226b21 | 2092 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
53b381b3 | 2093 | |
0b246afa | 2094 | btrfs_bio_wq_end_io(rbio->fs_info, bio, BTRFS_WQ_ENDIO_RAID56); |
53b381b3 | 2095 | |
4e49ea4a | 2096 | submit_bio(bio); |
53b381b3 DW |
2097 | } |
2098 | out: | |
2099 | return 0; | |
2100 | ||
2101 | cleanup: | |
b4ee1782 OS |
2102 | if (rbio->operation == BTRFS_RBIO_READ_REBUILD || |
2103 | rbio->operation == BTRFS_RBIO_REBUILD_MISSING) | |
4246a0b6 | 2104 | rbio_orig_end_io(rbio, -EIO); |
53b381b3 DW |
2105 | return -EIO; |
2106 | } | |
2107 | ||
2108 | /* | |
2109 | * the main entry point for reads from the higher layers. This | |
2110 | * is really only called when the normal read path had a failure, | |
2111 | * so we assume the bio they send down corresponds to a failed part | |
2112 | * of the drive. | |
2113 | */ | |
2ff7e61e | 2114 | int raid56_parity_recover(struct btrfs_fs_info *fs_info, struct bio *bio, |
8e5cfb55 ZL |
2115 | struct btrfs_bio *bbio, u64 stripe_len, |
2116 | int mirror_num, int generic_io) | |
53b381b3 DW |
2117 | { |
2118 | struct btrfs_raid_bio *rbio; | |
2119 | int ret; | |
2120 | ||
2ff7e61e | 2121 | rbio = alloc_rbio(fs_info, bbio, stripe_len); |
af8e2d1d | 2122 | if (IS_ERR(rbio)) { |
6e9606d2 ZL |
2123 | if (generic_io) |
2124 | btrfs_put_bbio(bbio); | |
53b381b3 | 2125 | return PTR_ERR(rbio); |
af8e2d1d | 2126 | } |
53b381b3 | 2127 | |
1b94b556 | 2128 | rbio->operation = BTRFS_RBIO_READ_REBUILD; |
53b381b3 | 2129 | bio_list_add(&rbio->bio_list, bio); |
4f024f37 | 2130 | rbio->bio_list_bytes = bio->bi_iter.bi_size; |
53b381b3 DW |
2131 | |
2132 | rbio->faila = find_logical_bio_stripe(rbio, bio); | |
2133 | if (rbio->faila == -1) { | |
0b246afa | 2134 | btrfs_warn(fs_info, |
e46a28ca LB |
2135 | "%s could not find the bad stripe in raid56 so that we cannot recover any more (bio has logical %llu len %llu, bbio has map_type %llu)", |
2136 | __func__, (u64)bio->bi_iter.bi_sector << 9, | |
2137 | (u64)bio->bi_iter.bi_size, bbio->map_type); | |
6e9606d2 ZL |
2138 | if (generic_io) |
2139 | btrfs_put_bbio(bbio); | |
53b381b3 DW |
2140 | kfree(rbio); |
2141 | return -EIO; | |
2142 | } | |
2143 | ||
4245215d | 2144 | if (generic_io) { |
0b246afa | 2145 | btrfs_bio_counter_inc_noblocked(fs_info); |
4245215d MX |
2146 | rbio->generic_bio_cnt = 1; |
2147 | } else { | |
6e9606d2 | 2148 | btrfs_get_bbio(bbio); |
4245215d MX |
2149 | } |
2150 | ||
53b381b3 DW |
2151 | /* |
2152 | * reconstruct from the q stripe if they are | |
2153 | * asking for mirror 3 | |
2154 | */ | |
2155 | if (mirror_num == 3) | |
2c8cdd6e | 2156 | rbio->failb = rbio->real_stripes - 2; |
53b381b3 DW |
2157 | |
2158 | ret = lock_stripe_add(rbio); | |
2159 | ||
2160 | /* | |
2161 | * __raid56_parity_recover will end the bio with | |
2162 | * any errors it hits. We don't want to return | |
2163 | * its error value up the stack because our caller | |
2164 | * will end up calling bio_endio with any nonzero | |
2165 | * return | |
2166 | */ | |
2167 | if (ret == 0) | |
2168 | __raid56_parity_recover(rbio); | |
2169 | /* | |
2170 | * our rbio has been added to the list of | |
2171 | * rbios that will be handled after the | |
2172 | * currently lock owner is done | |
2173 | */ | |
2174 | return 0; | |
2175 | ||
2176 | } | |
2177 | ||
2178 | static void rmw_work(struct btrfs_work *work) | |
2179 | { | |
2180 | struct btrfs_raid_bio *rbio; | |
2181 | ||
2182 | rbio = container_of(work, struct btrfs_raid_bio, work); | |
2183 | raid56_rmw_stripe(rbio); | |
2184 | } | |
2185 | ||
2186 | static void read_rebuild_work(struct btrfs_work *work) | |
2187 | { | |
2188 | struct btrfs_raid_bio *rbio; | |
2189 | ||
2190 | rbio = container_of(work, struct btrfs_raid_bio, work); | |
2191 | __raid56_parity_recover(rbio); | |
2192 | } | |
5a6ac9ea MX |
2193 | |
2194 | /* | |
2195 | * The following code is used to scrub/replace the parity stripe | |
2196 | * | |
2197 | * Note: We need make sure all the pages that add into the scrub/replace | |
2198 | * raid bio are correct and not be changed during the scrub/replace. That | |
2199 | * is those pages just hold metadata or file data with checksum. | |
2200 | */ | |
2201 | ||
2202 | struct btrfs_raid_bio * | |
2ff7e61e | 2203 | raid56_parity_alloc_scrub_rbio(struct btrfs_fs_info *fs_info, struct bio *bio, |
8e5cfb55 ZL |
2204 | struct btrfs_bio *bbio, u64 stripe_len, |
2205 | struct btrfs_device *scrub_dev, | |
5a6ac9ea MX |
2206 | unsigned long *dbitmap, int stripe_nsectors) |
2207 | { | |
2208 | struct btrfs_raid_bio *rbio; | |
2209 | int i; | |
2210 | ||
2ff7e61e | 2211 | rbio = alloc_rbio(fs_info, bbio, stripe_len); |
5a6ac9ea MX |
2212 | if (IS_ERR(rbio)) |
2213 | return NULL; | |
2214 | bio_list_add(&rbio->bio_list, bio); | |
2215 | /* | |
2216 | * This is a special bio which is used to hold the completion handler | |
2217 | * and make the scrub rbio is similar to the other types | |
2218 | */ | |
2219 | ASSERT(!bio->bi_iter.bi_size); | |
2220 | rbio->operation = BTRFS_RBIO_PARITY_SCRUB; | |
2221 | ||
2c8cdd6e | 2222 | for (i = 0; i < rbio->real_stripes; i++) { |
5a6ac9ea MX |
2223 | if (bbio->stripes[i].dev == scrub_dev) { |
2224 | rbio->scrubp = i; | |
2225 | break; | |
2226 | } | |
2227 | } | |
2228 | ||
2229 | /* Now we just support the sectorsize equals to page size */ | |
0b246afa | 2230 | ASSERT(fs_info->sectorsize == PAGE_SIZE); |
5a6ac9ea MX |
2231 | ASSERT(rbio->stripe_npages == stripe_nsectors); |
2232 | bitmap_copy(rbio->dbitmap, dbitmap, stripe_nsectors); | |
2233 | ||
2234 | return rbio; | |
2235 | } | |
2236 | ||
b4ee1782 OS |
2237 | /* Used for both parity scrub and missing. */ |
2238 | void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page, | |
2239 | u64 logical) | |
5a6ac9ea MX |
2240 | { |
2241 | int stripe_offset; | |
2242 | int index; | |
2243 | ||
8e5cfb55 ZL |
2244 | ASSERT(logical >= rbio->bbio->raid_map[0]); |
2245 | ASSERT(logical + PAGE_SIZE <= rbio->bbio->raid_map[0] + | |
5a6ac9ea | 2246 | rbio->stripe_len * rbio->nr_data); |
8e5cfb55 | 2247 | stripe_offset = (int)(logical - rbio->bbio->raid_map[0]); |
09cbfeaf | 2248 | index = stripe_offset >> PAGE_SHIFT; |
5a6ac9ea MX |
2249 | rbio->bio_pages[index] = page; |
2250 | } | |
2251 | ||
2252 | /* | |
2253 | * We just scrub the parity that we have correct data on the same horizontal, | |
2254 | * so we needn't allocate all pages for all the stripes. | |
2255 | */ | |
2256 | static int alloc_rbio_essential_pages(struct btrfs_raid_bio *rbio) | |
2257 | { | |
2258 | int i; | |
2259 | int bit; | |
2260 | int index; | |
2261 | struct page *page; | |
2262 | ||
2263 | for_each_set_bit(bit, rbio->dbitmap, rbio->stripe_npages) { | |
2c8cdd6e | 2264 | for (i = 0; i < rbio->real_stripes; i++) { |
5a6ac9ea MX |
2265 | index = i * rbio->stripe_npages + bit; |
2266 | if (rbio->stripe_pages[index]) | |
2267 | continue; | |
2268 | ||
2269 | page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
2270 | if (!page) | |
2271 | return -ENOMEM; | |
2272 | rbio->stripe_pages[index] = page; | |
5a6ac9ea MX |
2273 | } |
2274 | } | |
2275 | return 0; | |
2276 | } | |
2277 | ||
5a6ac9ea MX |
2278 | static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio, |
2279 | int need_check) | |
2280 | { | |
76035976 | 2281 | struct btrfs_bio *bbio = rbio->bbio; |
2c8cdd6e | 2282 | void *pointers[rbio->real_stripes]; |
76035976 | 2283 | DECLARE_BITMAP(pbitmap, rbio->stripe_npages); |
5a6ac9ea MX |
2284 | int nr_data = rbio->nr_data; |
2285 | int stripe; | |
2286 | int pagenr; | |
2287 | int p_stripe = -1; | |
2288 | int q_stripe = -1; | |
2289 | struct page *p_page = NULL; | |
2290 | struct page *q_page = NULL; | |
2291 | struct bio_list bio_list; | |
2292 | struct bio *bio; | |
76035976 | 2293 | int is_replace = 0; |
5a6ac9ea MX |
2294 | int ret; |
2295 | ||
2296 | bio_list_init(&bio_list); | |
2297 | ||
2c8cdd6e MX |
2298 | if (rbio->real_stripes - rbio->nr_data == 1) { |
2299 | p_stripe = rbio->real_stripes - 1; | |
2300 | } else if (rbio->real_stripes - rbio->nr_data == 2) { | |
2301 | p_stripe = rbio->real_stripes - 2; | |
2302 | q_stripe = rbio->real_stripes - 1; | |
5a6ac9ea MX |
2303 | } else { |
2304 | BUG(); | |
2305 | } | |
2306 | ||
76035976 MX |
2307 | if (bbio->num_tgtdevs && bbio->tgtdev_map[rbio->scrubp]) { |
2308 | is_replace = 1; | |
2309 | bitmap_copy(pbitmap, rbio->dbitmap, rbio->stripe_npages); | |
2310 | } | |
2311 | ||
5a6ac9ea MX |
2312 | /* |
2313 | * Because the higher layers(scrubber) are unlikely to | |
2314 | * use this area of the disk again soon, so don't cache | |
2315 | * it. | |
2316 | */ | |
2317 | clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags); | |
2318 | ||
2319 | if (!need_check) | |
2320 | goto writeback; | |
2321 | ||
2322 | p_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
2323 | if (!p_page) | |
2324 | goto cleanup; | |
2325 | SetPageUptodate(p_page); | |
2326 | ||
2327 | if (q_stripe != -1) { | |
2328 | q_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
2329 | if (!q_page) { | |
2330 | __free_page(p_page); | |
2331 | goto cleanup; | |
2332 | } | |
2333 | SetPageUptodate(q_page); | |
2334 | } | |
2335 | ||
2336 | atomic_set(&rbio->error, 0); | |
2337 | ||
2338 | for_each_set_bit(pagenr, rbio->dbitmap, rbio->stripe_npages) { | |
2339 | struct page *p; | |
2340 | void *parity; | |
2341 | /* first collect one page from each data stripe */ | |
2342 | for (stripe = 0; stripe < nr_data; stripe++) { | |
2343 | p = page_in_rbio(rbio, stripe, pagenr, 0); | |
2344 | pointers[stripe] = kmap(p); | |
2345 | } | |
2346 | ||
2347 | /* then add the parity stripe */ | |
2348 | pointers[stripe++] = kmap(p_page); | |
2349 | ||
2350 | if (q_stripe != -1) { | |
2351 | ||
2352 | /* | |
2353 | * raid6, add the qstripe and call the | |
2354 | * library function to fill in our p/q | |
2355 | */ | |
2356 | pointers[stripe++] = kmap(q_page); | |
2357 | ||
2c8cdd6e | 2358 | raid6_call.gen_syndrome(rbio->real_stripes, PAGE_SIZE, |
5a6ac9ea MX |
2359 | pointers); |
2360 | } else { | |
2361 | /* raid5 */ | |
2362 | memcpy(pointers[nr_data], pointers[0], PAGE_SIZE); | |
09cbfeaf | 2363 | run_xor(pointers + 1, nr_data - 1, PAGE_SIZE); |
5a6ac9ea MX |
2364 | } |
2365 | ||
01327610 | 2366 | /* Check scrubbing parity and repair it */ |
5a6ac9ea MX |
2367 | p = rbio_stripe_page(rbio, rbio->scrubp, pagenr); |
2368 | parity = kmap(p); | |
09cbfeaf KS |
2369 | if (memcmp(parity, pointers[rbio->scrubp], PAGE_SIZE)) |
2370 | memcpy(parity, pointers[rbio->scrubp], PAGE_SIZE); | |
5a6ac9ea MX |
2371 | else |
2372 | /* Parity is right, needn't writeback */ | |
2373 | bitmap_clear(rbio->dbitmap, pagenr, 1); | |
2374 | kunmap(p); | |
2375 | ||
2c8cdd6e | 2376 | for (stripe = 0; stripe < rbio->real_stripes; stripe++) |
5a6ac9ea MX |
2377 | kunmap(page_in_rbio(rbio, stripe, pagenr, 0)); |
2378 | } | |
2379 | ||
2380 | __free_page(p_page); | |
2381 | if (q_page) | |
2382 | __free_page(q_page); | |
2383 | ||
2384 | writeback: | |
2385 | /* | |
2386 | * time to start writing. Make bios for everything from the | |
2387 | * higher layers (the bio_list in our rbio) and our p/q. Ignore | |
2388 | * everything else. | |
2389 | */ | |
2390 | for_each_set_bit(pagenr, rbio->dbitmap, rbio->stripe_npages) { | |
2391 | struct page *page; | |
2392 | ||
2393 | page = rbio_stripe_page(rbio, rbio->scrubp, pagenr); | |
2394 | ret = rbio_add_io_page(rbio, &bio_list, | |
2395 | page, rbio->scrubp, pagenr, rbio->stripe_len); | |
2396 | if (ret) | |
2397 | goto cleanup; | |
2398 | } | |
2399 | ||
76035976 MX |
2400 | if (!is_replace) |
2401 | goto submit_write; | |
2402 | ||
2403 | for_each_set_bit(pagenr, pbitmap, rbio->stripe_npages) { | |
2404 | struct page *page; | |
2405 | ||
2406 | page = rbio_stripe_page(rbio, rbio->scrubp, pagenr); | |
2407 | ret = rbio_add_io_page(rbio, &bio_list, page, | |
2408 | bbio->tgtdev_map[rbio->scrubp], | |
2409 | pagenr, rbio->stripe_len); | |
2410 | if (ret) | |
2411 | goto cleanup; | |
2412 | } | |
2413 | ||
2414 | submit_write: | |
5a6ac9ea MX |
2415 | nr_data = bio_list_size(&bio_list); |
2416 | if (!nr_data) { | |
2417 | /* Every parity is right */ | |
4246a0b6 | 2418 | rbio_orig_end_io(rbio, 0); |
5a6ac9ea MX |
2419 | return; |
2420 | } | |
2421 | ||
2422 | atomic_set(&rbio->stripes_pending, nr_data); | |
2423 | ||
2424 | while (1) { | |
2425 | bio = bio_list_pop(&bio_list); | |
2426 | if (!bio) | |
2427 | break; | |
2428 | ||
2429 | bio->bi_private = rbio; | |
a6111d11 | 2430 | bio->bi_end_io = raid_write_end_io; |
37226b21 | 2431 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
4e49ea4a MC |
2432 | |
2433 | submit_bio(bio); | |
5a6ac9ea MX |
2434 | } |
2435 | return; | |
2436 | ||
2437 | cleanup: | |
4246a0b6 | 2438 | rbio_orig_end_io(rbio, -EIO); |
5a6ac9ea MX |
2439 | } |
2440 | ||
2441 | static inline int is_data_stripe(struct btrfs_raid_bio *rbio, int stripe) | |
2442 | { | |
2443 | if (stripe >= 0 && stripe < rbio->nr_data) | |
2444 | return 1; | |
2445 | return 0; | |
2446 | } | |
2447 | ||
2448 | /* | |
2449 | * While we're doing the parity check and repair, we could have errors | |
2450 | * in reading pages off the disk. This checks for errors and if we're | |
2451 | * not able to read the page it'll trigger parity reconstruction. The | |
2452 | * parity scrub will be finished after we've reconstructed the failed | |
2453 | * stripes | |
2454 | */ | |
2455 | static void validate_rbio_for_parity_scrub(struct btrfs_raid_bio *rbio) | |
2456 | { | |
2457 | if (atomic_read(&rbio->error) > rbio->bbio->max_errors) | |
2458 | goto cleanup; | |
2459 | ||
2460 | if (rbio->faila >= 0 || rbio->failb >= 0) { | |
2461 | int dfail = 0, failp = -1; | |
2462 | ||
2463 | if (is_data_stripe(rbio, rbio->faila)) | |
2464 | dfail++; | |
2465 | else if (is_parity_stripe(rbio->faila)) | |
2466 | failp = rbio->faila; | |
2467 | ||
2468 | if (is_data_stripe(rbio, rbio->failb)) | |
2469 | dfail++; | |
2470 | else if (is_parity_stripe(rbio->failb)) | |
2471 | failp = rbio->failb; | |
2472 | ||
2473 | /* | |
2474 | * Because we can not use a scrubbing parity to repair | |
2475 | * the data, so the capability of the repair is declined. | |
2476 | * (In the case of RAID5, we can not repair anything) | |
2477 | */ | |
2478 | if (dfail > rbio->bbio->max_errors - 1) | |
2479 | goto cleanup; | |
2480 | ||
2481 | /* | |
2482 | * If all data is good, only parity is correctly, just | |
2483 | * repair the parity. | |
2484 | */ | |
2485 | if (dfail == 0) { | |
2486 | finish_parity_scrub(rbio, 0); | |
2487 | return; | |
2488 | } | |
2489 | ||
2490 | /* | |
2491 | * Here means we got one corrupted data stripe and one | |
2492 | * corrupted parity on RAID6, if the corrupted parity | |
01327610 | 2493 | * is scrubbing parity, luckily, use the other one to repair |
5a6ac9ea MX |
2494 | * the data, or we can not repair the data stripe. |
2495 | */ | |
2496 | if (failp != rbio->scrubp) | |
2497 | goto cleanup; | |
2498 | ||
2499 | __raid_recover_end_io(rbio); | |
2500 | } else { | |
2501 | finish_parity_scrub(rbio, 1); | |
2502 | } | |
2503 | return; | |
2504 | ||
2505 | cleanup: | |
4246a0b6 | 2506 | rbio_orig_end_io(rbio, -EIO); |
5a6ac9ea MX |
2507 | } |
2508 | ||
2509 | /* | |
2510 | * end io for the read phase of the rmw cycle. All the bios here are physical | |
2511 | * stripe bios we've read from the disk so we can recalculate the parity of the | |
2512 | * stripe. | |
2513 | * | |
2514 | * This will usually kick off finish_rmw once all the bios are read in, but it | |
2515 | * may trigger parity reconstruction if we had any errors along the way | |
2516 | */ | |
4246a0b6 | 2517 | static void raid56_parity_scrub_end_io(struct bio *bio) |
5a6ac9ea MX |
2518 | { |
2519 | struct btrfs_raid_bio *rbio = bio->bi_private; | |
2520 | ||
4246a0b6 | 2521 | if (bio->bi_error) |
5a6ac9ea MX |
2522 | fail_bio_stripe(rbio, bio); |
2523 | else | |
2524 | set_bio_pages_uptodate(bio); | |
2525 | ||
2526 | bio_put(bio); | |
2527 | ||
2528 | if (!atomic_dec_and_test(&rbio->stripes_pending)) | |
2529 | return; | |
2530 | ||
2531 | /* | |
2532 | * this will normally call finish_rmw to start our write | |
2533 | * but if there are any failed stripes we'll reconstruct | |
2534 | * from parity first | |
2535 | */ | |
2536 | validate_rbio_for_parity_scrub(rbio); | |
2537 | } | |
2538 | ||
2539 | static void raid56_parity_scrub_stripe(struct btrfs_raid_bio *rbio) | |
2540 | { | |
2541 | int bios_to_read = 0; | |
5a6ac9ea MX |
2542 | struct bio_list bio_list; |
2543 | int ret; | |
2544 | int pagenr; | |
2545 | int stripe; | |
2546 | struct bio *bio; | |
2547 | ||
2548 | ret = alloc_rbio_essential_pages(rbio); | |
2549 | if (ret) | |
2550 | goto cleanup; | |
2551 | ||
2552 | bio_list_init(&bio_list); | |
2553 | ||
2554 | atomic_set(&rbio->error, 0); | |
2555 | /* | |
2556 | * build a list of bios to read all the missing parts of this | |
2557 | * stripe | |
2558 | */ | |
2c8cdd6e | 2559 | for (stripe = 0; stripe < rbio->real_stripes; stripe++) { |
5a6ac9ea MX |
2560 | for_each_set_bit(pagenr, rbio->dbitmap, rbio->stripe_npages) { |
2561 | struct page *page; | |
2562 | /* | |
2563 | * we want to find all the pages missing from | |
2564 | * the rbio and read them from the disk. If | |
2565 | * page_in_rbio finds a page in the bio list | |
2566 | * we don't need to read it off the stripe. | |
2567 | */ | |
2568 | page = page_in_rbio(rbio, stripe, pagenr, 1); | |
2569 | if (page) | |
2570 | continue; | |
2571 | ||
2572 | page = rbio_stripe_page(rbio, stripe, pagenr); | |
2573 | /* | |
2574 | * the bio cache may have handed us an uptodate | |
2575 | * page. If so, be happy and use it | |
2576 | */ | |
2577 | if (PageUptodate(page)) | |
2578 | continue; | |
2579 | ||
2580 | ret = rbio_add_io_page(rbio, &bio_list, page, | |
2581 | stripe, pagenr, rbio->stripe_len); | |
2582 | if (ret) | |
2583 | goto cleanup; | |
2584 | } | |
2585 | } | |
2586 | ||
2587 | bios_to_read = bio_list_size(&bio_list); | |
2588 | if (!bios_to_read) { | |
2589 | /* | |
2590 | * this can happen if others have merged with | |
2591 | * us, it means there is nothing left to read. | |
2592 | * But if there are missing devices it may not be | |
2593 | * safe to do the full stripe write yet. | |
2594 | */ | |
2595 | goto finish; | |
2596 | } | |
2597 | ||
2598 | /* | |
2599 | * the bbio may be freed once we submit the last bio. Make sure | |
2600 | * not to touch it after that | |
2601 | */ | |
2602 | atomic_set(&rbio->stripes_pending, bios_to_read); | |
2603 | while (1) { | |
2604 | bio = bio_list_pop(&bio_list); | |
2605 | if (!bio) | |
2606 | break; | |
2607 | ||
2608 | bio->bi_private = rbio; | |
2609 | bio->bi_end_io = raid56_parity_scrub_end_io; | |
37226b21 | 2610 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
5a6ac9ea | 2611 | |
0b246afa | 2612 | btrfs_bio_wq_end_io(rbio->fs_info, bio, BTRFS_WQ_ENDIO_RAID56); |
5a6ac9ea | 2613 | |
4e49ea4a | 2614 | submit_bio(bio); |
5a6ac9ea MX |
2615 | } |
2616 | /* the actual write will happen once the reads are done */ | |
2617 | return; | |
2618 | ||
2619 | cleanup: | |
4246a0b6 | 2620 | rbio_orig_end_io(rbio, -EIO); |
5a6ac9ea MX |
2621 | return; |
2622 | ||
2623 | finish: | |
2624 | validate_rbio_for_parity_scrub(rbio); | |
2625 | } | |
2626 | ||
2627 | static void scrub_parity_work(struct btrfs_work *work) | |
2628 | { | |
2629 | struct btrfs_raid_bio *rbio; | |
2630 | ||
2631 | rbio = container_of(work, struct btrfs_raid_bio, work); | |
2632 | raid56_parity_scrub_stripe(rbio); | |
2633 | } | |
2634 | ||
2635 | static void async_scrub_parity(struct btrfs_raid_bio *rbio) | |
2636 | { | |
2637 | btrfs_init_work(&rbio->work, btrfs_rmw_helper, | |
2638 | scrub_parity_work, NULL, NULL); | |
2639 | ||
0b246afa | 2640 | btrfs_queue_work(rbio->fs_info->rmw_workers, &rbio->work); |
5a6ac9ea MX |
2641 | } |
2642 | ||
2643 | void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio) | |
2644 | { | |
2645 | if (!lock_stripe_add(rbio)) | |
2646 | async_scrub_parity(rbio); | |
2647 | } | |
b4ee1782 OS |
2648 | |
2649 | /* The following code is used for dev replace of a missing RAID 5/6 device. */ | |
2650 | ||
2651 | struct btrfs_raid_bio * | |
2ff7e61e | 2652 | raid56_alloc_missing_rbio(struct btrfs_fs_info *fs_info, struct bio *bio, |
b4ee1782 OS |
2653 | struct btrfs_bio *bbio, u64 length) |
2654 | { | |
2655 | struct btrfs_raid_bio *rbio; | |
2656 | ||
2ff7e61e | 2657 | rbio = alloc_rbio(fs_info, bbio, length); |
b4ee1782 OS |
2658 | if (IS_ERR(rbio)) |
2659 | return NULL; | |
2660 | ||
2661 | rbio->operation = BTRFS_RBIO_REBUILD_MISSING; | |
2662 | bio_list_add(&rbio->bio_list, bio); | |
2663 | /* | |
2664 | * This is a special bio which is used to hold the completion handler | |
2665 | * and make the scrub rbio is similar to the other types | |
2666 | */ | |
2667 | ASSERT(!bio->bi_iter.bi_size); | |
2668 | ||
2669 | rbio->faila = find_logical_bio_stripe(rbio, bio); | |
2670 | if (rbio->faila == -1) { | |
2671 | BUG(); | |
2672 | kfree(rbio); | |
2673 | return NULL; | |
2674 | } | |
2675 | ||
2676 | return rbio; | |
2677 | } | |
2678 | ||
2679 | static void missing_raid56_work(struct btrfs_work *work) | |
2680 | { | |
2681 | struct btrfs_raid_bio *rbio; | |
2682 | ||
2683 | rbio = container_of(work, struct btrfs_raid_bio, work); | |
2684 | __raid56_parity_recover(rbio); | |
2685 | } | |
2686 | ||
2687 | static void async_missing_raid56(struct btrfs_raid_bio *rbio) | |
2688 | { | |
2689 | btrfs_init_work(&rbio->work, btrfs_rmw_helper, | |
2690 | missing_raid56_work, NULL, NULL); | |
2691 | ||
2692 | btrfs_queue_work(rbio->fs_info->rmw_workers, &rbio->work); | |
2693 | } | |
2694 | ||
2695 | void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio) | |
2696 | { | |
2697 | if (!lock_stripe_add(rbio)) | |
2698 | async_missing_raid56(rbio); | |
2699 | } |