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1da177e4 LT |
1 | /* |
2 | * raid1.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat | |
5 | * | |
6 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
7 | * | |
8 | * RAID-1 management functions. | |
9 | * | |
10 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 | |
11 | * | |
96de0e25 | 12 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
1da177e4 LT |
13 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
14 | * | |
191ea9b2 N |
15 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
16 | * bitmapped intelligence in resync: | |
17 | * | |
18 | * - bitmap marked during normal i/o | |
19 | * - bitmap used to skip nondirty blocks during sync | |
20 | * | |
21 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: | |
22 | * - persistent bitmap code | |
23 | * | |
1da177e4 LT |
24 | * This program is free software; you can redistribute it and/or modify |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2, or (at your option) | |
27 | * any later version. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
31 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
25570727 | 35 | #include <linux/delay.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
056075c7 | 37 | #include <linux/module.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
8bda470e | 39 | #include <linux/ratelimit.h> |
3f07c014 IM |
40 | #include <linux/sched/signal.h> |
41 | ||
109e3765 | 42 | #include <trace/events/block.h> |
3f07c014 | 43 | |
43b2e5d8 | 44 | #include "md.h" |
ef740c37 CH |
45 | #include "raid1.h" |
46 | #include "bitmap.h" | |
191ea9b2 | 47 | |
394ed8e4 SL |
48 | #define UNSUPPORTED_MDDEV_FLAGS \ |
49 | ((1L << MD_HAS_JOURNAL) | \ | |
ea0213e0 AP |
50 | (1L << MD_JOURNAL_CLEAN) | \ |
51 | (1L << MD_HAS_PPL)) | |
394ed8e4 | 52 | |
1da177e4 LT |
53 | /* |
54 | * Number of guaranteed r1bios in case of extreme VM load: | |
55 | */ | |
56 | #define NR_RAID1_BIOS 256 | |
57 | ||
473e87ce JB |
58 | /* when we get a read error on a read-only array, we redirect to another |
59 | * device without failing the first device, or trying to over-write to | |
60 | * correct the read error. To keep track of bad blocks on a per-bio | |
61 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer | |
62 | */ | |
63 | #define IO_BLOCKED ((struct bio *)1) | |
64 | /* When we successfully write to a known bad-block, we need to remove the | |
65 | * bad-block marking which must be done from process context. So we record | |
66 | * the success by setting devs[n].bio to IO_MADE_GOOD | |
67 | */ | |
68 | #define IO_MADE_GOOD ((struct bio *)2) | |
69 | ||
70 | #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) | |
71 | ||
34db0cd6 N |
72 | /* When there are this many requests queue to be written by |
73 | * the raid1 thread, we become 'congested' to provide back-pressure | |
74 | * for writeback. | |
75 | */ | |
76 | static int max_queued_requests = 1024; | |
1da177e4 | 77 | |
fd76863e | 78 | static void allow_barrier(struct r1conf *conf, sector_t sector_nr); |
79 | static void lower_barrier(struct r1conf *conf, sector_t sector_nr); | |
1da177e4 | 80 | |
578b54ad N |
81 | #define raid1_log(md, fmt, args...) \ |
82 | do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0) | |
83 | ||
dd0fc66f | 84 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
85 | { |
86 | struct pool_info *pi = data; | |
9f2c9d12 | 87 | int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
1da177e4 LT |
88 | |
89 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 90 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
91 | } |
92 | ||
93 | static void r1bio_pool_free(void *r1_bio, void *data) | |
94 | { | |
95 | kfree(r1_bio); | |
96 | } | |
97 | ||
8e005f7c | 98 | #define RESYNC_DEPTH 32 |
1da177e4 | 99 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) |
8e005f7c | 100 | #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) |
101 | #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) | |
c40f341f GR |
102 | #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) |
103 | #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) | |
1da177e4 | 104 | |
dd0fc66f | 105 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
106 | { |
107 | struct pool_info *pi = data; | |
9f2c9d12 | 108 | struct r1bio *r1_bio; |
1da177e4 | 109 | struct bio *bio; |
da1aab3d | 110 | int need_pages; |
1da177e4 LT |
111 | int i, j; |
112 | ||
113 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 114 | if (!r1_bio) |
1da177e4 | 115 | return NULL; |
1da177e4 LT |
116 | |
117 | /* | |
118 | * Allocate bios : 1 for reading, n-1 for writing | |
119 | */ | |
120 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 121 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
122 | if (!bio) |
123 | goto out_free_bio; | |
124 | r1_bio->bios[j] = bio; | |
125 | } | |
126 | /* | |
127 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
128 | * the first bio. |
129 | * If this is a user-requested check/repair, allocate | |
130 | * RESYNC_PAGES for each bio. | |
1da177e4 | 131 | */ |
d11c171e | 132 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
da1aab3d | 133 | need_pages = pi->raid_disks; |
d11c171e | 134 | else |
da1aab3d N |
135 | need_pages = 1; |
136 | for (j = 0; j < need_pages; j++) { | |
d11c171e | 137 | bio = r1_bio->bios[j]; |
a0787606 | 138 | bio->bi_vcnt = RESYNC_PAGES; |
d11c171e | 139 | |
a0787606 | 140 | if (bio_alloc_pages(bio, gfp_flags)) |
da1aab3d | 141 | goto out_free_pages; |
d11c171e N |
142 | } |
143 | /* If not user-requests, copy the page pointers to all bios */ | |
144 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
145 | for (i=0; i<RESYNC_PAGES ; i++) | |
146 | for (j=1; j<pi->raid_disks; j++) | |
147 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
148 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
149 | } |
150 | ||
151 | r1_bio->master_bio = NULL; | |
152 | ||
153 | return r1_bio; | |
154 | ||
da1aab3d | 155 | out_free_pages: |
491221f8 GJ |
156 | while (--j >= 0) |
157 | bio_free_pages(r1_bio->bios[j]); | |
da1aab3d | 158 | |
1da177e4 | 159 | out_free_bio: |
8f19ccb2 | 160 | while (++j < pi->raid_disks) |
1da177e4 LT |
161 | bio_put(r1_bio->bios[j]); |
162 | r1bio_pool_free(r1_bio, data); | |
163 | return NULL; | |
164 | } | |
165 | ||
166 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
167 | { | |
168 | struct pool_info *pi = data; | |
d11c171e | 169 | int i,j; |
9f2c9d12 | 170 | struct r1bio *r1bio = __r1_bio; |
1da177e4 | 171 | |
d11c171e N |
172 | for (i = 0; i < RESYNC_PAGES; i++) |
173 | for (j = pi->raid_disks; j-- ;) { | |
174 | if (j == 0 || | |
175 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
176 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 177 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 178 | } |
1da177e4 LT |
179 | for (i=0 ; i < pi->raid_disks; i++) |
180 | bio_put(r1bio->bios[i]); | |
181 | ||
182 | r1bio_pool_free(r1bio, data); | |
183 | } | |
184 | ||
e8096360 | 185 | static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
1da177e4 LT |
186 | { |
187 | int i; | |
188 | ||
8f19ccb2 | 189 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 | 190 | struct bio **bio = r1_bio->bios + i; |
4367af55 | 191 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
192 | bio_put(*bio); |
193 | *bio = NULL; | |
194 | } | |
195 | } | |
196 | ||
9f2c9d12 | 197 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 198 | { |
e8096360 | 199 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 200 | |
1da177e4 LT |
201 | put_all_bios(conf, r1_bio); |
202 | mempool_free(r1_bio, conf->r1bio_pool); | |
203 | } | |
204 | ||
9f2c9d12 | 205 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 206 | { |
e8096360 | 207 | struct r1conf *conf = r1_bio->mddev->private; |
af5f42a7 | 208 | sector_t sect = r1_bio->sector; |
3e198f78 N |
209 | int i; |
210 | ||
8f19ccb2 | 211 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3e198f78 N |
212 | struct bio *bio = r1_bio->bios[i]; |
213 | if (bio->bi_end_io) | |
214 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
215 | } | |
1da177e4 LT |
216 | |
217 | mempool_free(r1_bio, conf->r1buf_pool); | |
218 | ||
af5f42a7 | 219 | lower_barrier(conf, sect); |
1da177e4 LT |
220 | } |
221 | ||
9f2c9d12 | 222 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
223 | { |
224 | unsigned long flags; | |
fd01b88c | 225 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 226 | struct r1conf *conf = mddev->private; |
fd76863e | 227 | int idx; |
1da177e4 | 228 | |
fd76863e | 229 | idx = sector_to_idx(r1_bio->sector); |
1da177e4 LT |
230 | spin_lock_irqsave(&conf->device_lock, flags); |
231 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
824e47da | 232 | atomic_inc(&conf->nr_queued[idx]); |
1da177e4 LT |
233 | spin_unlock_irqrestore(&conf->device_lock, flags); |
234 | ||
17999be4 | 235 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
236 | md_wakeup_thread(mddev->thread); |
237 | } | |
238 | ||
239 | /* | |
240 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
241 | * operation and are ready to return a success/failure code to the buffer | |
242 | * cache layer. | |
243 | */ | |
9f2c9d12 | 244 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
245 | { |
246 | struct bio *bio = r1_bio->master_bio; | |
e8096360 | 247 | struct r1conf *conf = r1_bio->mddev->private; |
d2eb35ac N |
248 | |
249 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
4246a0b6 CH |
250 | bio->bi_error = -EIO; |
251 | ||
37011e3a N |
252 | bio_endio(bio); |
253 | /* | |
254 | * Wake up any possible resync thread that waits for the device | |
255 | * to go idle. | |
256 | */ | |
257 | allow_barrier(conf, r1_bio->sector); | |
d2eb35ac N |
258 | } |
259 | ||
9f2c9d12 | 260 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
261 | { |
262 | struct bio *bio = r1_bio->master_bio; | |
263 | ||
4b6d287f N |
264 | /* if nobody has done the final endio yet, do it now */ |
265 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
266 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
267 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
4f024f37 KO |
268 | (unsigned long long) bio->bi_iter.bi_sector, |
269 | (unsigned long long) bio_end_sector(bio) - 1); | |
4b6d287f | 270 | |
d2eb35ac | 271 | call_bio_endio(r1_bio); |
4b6d287f | 272 | } |
1da177e4 LT |
273 | free_r1bio(r1_bio); |
274 | } | |
275 | ||
276 | /* | |
277 | * Update disk head position estimator based on IRQ completion info. | |
278 | */ | |
9f2c9d12 | 279 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 280 | { |
e8096360 | 281 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
282 | |
283 | conf->mirrors[disk].head_position = | |
284 | r1_bio->sector + (r1_bio->sectors); | |
285 | } | |
286 | ||
ba3ae3be NK |
287 | /* |
288 | * Find the disk number which triggered given bio | |
289 | */ | |
9f2c9d12 | 290 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
291 | { |
292 | int mirror; | |
30194636 N |
293 | struct r1conf *conf = r1_bio->mddev->private; |
294 | int raid_disks = conf->raid_disks; | |
ba3ae3be | 295 | |
8f19ccb2 | 296 | for (mirror = 0; mirror < raid_disks * 2; mirror++) |
ba3ae3be NK |
297 | if (r1_bio->bios[mirror] == bio) |
298 | break; | |
299 | ||
8f19ccb2 | 300 | BUG_ON(mirror == raid_disks * 2); |
ba3ae3be NK |
301 | update_head_pos(mirror, r1_bio); |
302 | ||
303 | return mirror; | |
304 | } | |
305 | ||
4246a0b6 | 306 | static void raid1_end_read_request(struct bio *bio) |
1da177e4 | 307 | { |
4246a0b6 | 308 | int uptodate = !bio->bi_error; |
9f2c9d12 | 309 | struct r1bio *r1_bio = bio->bi_private; |
e8096360 | 310 | struct r1conf *conf = r1_bio->mddev->private; |
e5872d58 | 311 | struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; |
1da177e4 | 312 | |
1da177e4 LT |
313 | /* |
314 | * this branch is our 'one mirror IO has finished' event handler: | |
315 | */ | |
e5872d58 | 316 | update_head_pos(r1_bio->read_disk, r1_bio); |
ddaf22ab | 317 | |
dd00a99e N |
318 | if (uptodate) |
319 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
2e52d449 N |
320 | else if (test_bit(FailFast, &rdev->flags) && |
321 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
322 | /* This was a fail-fast read so we definitely | |
323 | * want to retry */ | |
324 | ; | |
dd00a99e N |
325 | else { |
326 | /* If all other devices have failed, we want to return | |
327 | * the error upwards rather than fail the last device. | |
328 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 329 | */ |
dd00a99e N |
330 | unsigned long flags; |
331 | spin_lock_irqsave(&conf->device_lock, flags); | |
332 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
333 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
e5872d58 | 334 | test_bit(In_sync, &rdev->flags))) |
dd00a99e N |
335 | uptodate = 1; |
336 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
337 | } | |
1da177e4 | 338 | |
7ad4d4a6 | 339 | if (uptodate) { |
1da177e4 | 340 | raid_end_bio_io(r1_bio); |
e5872d58 | 341 | rdev_dec_pending(rdev, conf->mddev); |
7ad4d4a6 | 342 | } else { |
1da177e4 LT |
343 | /* |
344 | * oops, read error: | |
345 | */ | |
346 | char b[BDEVNAME_SIZE]; | |
1d41c216 N |
347 | pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", |
348 | mdname(conf->mddev), | |
349 | bdevname(rdev->bdev, b), | |
350 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 351 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 | 352 | reschedule_retry(r1_bio); |
7ad4d4a6 | 353 | /* don't drop the reference on read_disk yet */ |
1da177e4 | 354 | } |
1da177e4 LT |
355 | } |
356 | ||
9f2c9d12 | 357 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
358 | { |
359 | /* it really is the end of this request */ | |
360 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
361 | /* free extra copy of the data pages */ | |
362 | int i = r1_bio->behind_page_count; | |
363 | while (i--) | |
364 | safe_put_page(r1_bio->behind_bvecs[i].bv_page); | |
365 | kfree(r1_bio->behind_bvecs); | |
366 | r1_bio->behind_bvecs = NULL; | |
367 | } | |
368 | /* clear the bitmap if all writes complete successfully */ | |
369 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
370 | r1_bio->sectors, | |
371 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
372 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
373 | md_write_end(r1_bio->mddev); | |
374 | } | |
375 | ||
9f2c9d12 | 376 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 377 | { |
cd5ff9a1 N |
378 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
379 | return; | |
380 | ||
381 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
382 | reschedule_retry(r1_bio); | |
383 | else { | |
384 | close_write(r1_bio); | |
4367af55 N |
385 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
386 | reschedule_retry(r1_bio); | |
387 | else | |
388 | raid_end_bio_io(r1_bio); | |
4e78064f N |
389 | } |
390 | } | |
391 | ||
4246a0b6 | 392 | static void raid1_end_write_request(struct bio *bio) |
1da177e4 | 393 | { |
9f2c9d12 | 394 | struct r1bio *r1_bio = bio->bi_private; |
e5872d58 | 395 | int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 396 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 397 | struct bio *to_put = NULL; |
e5872d58 N |
398 | int mirror = find_bio_disk(r1_bio, bio); |
399 | struct md_rdev *rdev = conf->mirrors[mirror].rdev; | |
e3f948cd SL |
400 | bool discard_error; |
401 | ||
402 | discard_error = bio->bi_error && bio_op(bio) == REQ_OP_DISCARD; | |
1da177e4 | 403 | |
e9c7469b TH |
404 | /* |
405 | * 'one mirror IO has finished' event handler: | |
406 | */ | |
e3f948cd | 407 | if (bio->bi_error && !discard_error) { |
e5872d58 N |
408 | set_bit(WriteErrorSeen, &rdev->flags); |
409 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
410 | set_bit(MD_RECOVERY_NEEDED, & |
411 | conf->mddev->recovery); | |
412 | ||
212e7eb7 N |
413 | if (test_bit(FailFast, &rdev->flags) && |
414 | (bio->bi_opf & MD_FAILFAST) && | |
415 | /* We never try FailFast to WriteMostly devices */ | |
416 | !test_bit(WriteMostly, &rdev->flags)) { | |
417 | md_error(r1_bio->mddev, rdev); | |
418 | if (!test_bit(Faulty, &rdev->flags)) | |
419 | /* This is the only remaining device, | |
420 | * We need to retry the write without | |
421 | * FailFast | |
422 | */ | |
423 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
424 | else { | |
425 | /* Finished with this branch */ | |
426 | r1_bio->bios[mirror] = NULL; | |
427 | to_put = bio; | |
428 | } | |
429 | } else | |
430 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 | 431 | } else { |
1da177e4 | 432 | /* |
e9c7469b TH |
433 | * Set R1BIO_Uptodate in our master bio, so that we |
434 | * will return a good error code for to the higher | |
435 | * levels even if IO on some other mirrored buffer | |
436 | * fails. | |
437 | * | |
438 | * The 'master' represents the composite IO operation | |
439 | * to user-side. So if something waits for IO, then it | |
440 | * will wait for the 'master' bio. | |
1da177e4 | 441 | */ |
4367af55 N |
442 | sector_t first_bad; |
443 | int bad_sectors; | |
444 | ||
cd5ff9a1 N |
445 | r1_bio->bios[mirror] = NULL; |
446 | to_put = bio; | |
3056e3ae AL |
447 | /* |
448 | * Do not set R1BIO_Uptodate if the current device is | |
449 | * rebuilding or Faulty. This is because we cannot use | |
450 | * such device for properly reading the data back (we could | |
451 | * potentially use it, if the current write would have felt | |
452 | * before rdev->recovery_offset, but for simplicity we don't | |
453 | * check this here. | |
454 | */ | |
e5872d58 N |
455 | if (test_bit(In_sync, &rdev->flags) && |
456 | !test_bit(Faulty, &rdev->flags)) | |
3056e3ae | 457 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
e9c7469b | 458 | |
4367af55 | 459 | /* Maybe we can clear some bad blocks. */ |
e5872d58 | 460 | if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
e3f948cd | 461 | &first_bad, &bad_sectors) && !discard_error) { |
4367af55 N |
462 | r1_bio->bios[mirror] = IO_MADE_GOOD; |
463 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
464 | } | |
465 | } | |
466 | ||
e9c7469b | 467 | if (behind) { |
e5872d58 | 468 | if (test_bit(WriteMostly, &rdev->flags)) |
e9c7469b TH |
469 | atomic_dec(&r1_bio->behind_remaining); |
470 | ||
471 | /* | |
472 | * In behind mode, we ACK the master bio once the I/O | |
473 | * has safely reached all non-writemostly | |
474 | * disks. Setting the Returned bit ensures that this | |
475 | * gets done only once -- we don't ever want to return | |
476 | * -EIO here, instead we'll wait | |
477 | */ | |
478 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
479 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
480 | /* Maybe we can return now */ | |
481 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
482 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
483 | pr_debug("raid1: behind end write sectors" |
484 | " %llu-%llu\n", | |
4f024f37 KO |
485 | (unsigned long long) mbio->bi_iter.bi_sector, |
486 | (unsigned long long) bio_end_sector(mbio) - 1); | |
d2eb35ac | 487 | call_bio_endio(r1_bio); |
4b6d287f N |
488 | } |
489 | } | |
490 | } | |
4367af55 | 491 | if (r1_bio->bios[mirror] == NULL) |
e5872d58 | 492 | rdev_dec_pending(rdev, conf->mddev); |
e9c7469b | 493 | |
1da177e4 | 494 | /* |
1da177e4 LT |
495 | * Let's see if all mirrored write operations have finished |
496 | * already. | |
497 | */ | |
af6d7b76 | 498 | r1_bio_write_done(r1_bio); |
c70810b3 | 499 | |
04b857f7 N |
500 | if (to_put) |
501 | bio_put(to_put); | |
1da177e4 LT |
502 | } |
503 | ||
fd76863e | 504 | static sector_t align_to_barrier_unit_end(sector_t start_sector, |
505 | sector_t sectors) | |
506 | { | |
507 | sector_t len; | |
508 | ||
509 | WARN_ON(sectors == 0); | |
510 | /* | |
511 | * len is the number of sectors from start_sector to end of the | |
512 | * barrier unit which start_sector belongs to. | |
513 | */ | |
514 | len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - | |
515 | start_sector; | |
516 | ||
517 | if (len > sectors) | |
518 | len = sectors; | |
519 | ||
520 | return len; | |
521 | } | |
522 | ||
1da177e4 LT |
523 | /* |
524 | * This routine returns the disk from which the requested read should | |
525 | * be done. There is a per-array 'next expected sequential IO' sector | |
526 | * number - if this matches on the next IO then we use the last disk. | |
527 | * There is also a per-disk 'last know head position' sector that is | |
528 | * maintained from IRQ contexts, both the normal and the resync IO | |
529 | * completion handlers update this position correctly. If there is no | |
530 | * perfect sequential match then we pick the disk whose head is closest. | |
531 | * | |
532 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
533 | * because position is mirror, not device based. | |
534 | * | |
535 | * The rdev for the device selected will have nr_pending incremented. | |
536 | */ | |
e8096360 | 537 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 538 | { |
af3a2cd6 | 539 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
540 | int sectors; |
541 | int best_good_sectors; | |
9dedf603 SL |
542 | int best_disk, best_dist_disk, best_pending_disk; |
543 | int has_nonrot_disk; | |
be4d3280 | 544 | int disk; |
76073054 | 545 | sector_t best_dist; |
9dedf603 | 546 | unsigned int min_pending; |
3cb03002 | 547 | struct md_rdev *rdev; |
f3ac8bf7 | 548 | int choose_first; |
12cee5a8 | 549 | int choose_next_idle; |
1da177e4 LT |
550 | |
551 | rcu_read_lock(); | |
552 | /* | |
8ddf9efe | 553 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
554 | * device if no resync is going on, or below the resync window. |
555 | * We take the first readable disk when above the resync window. | |
556 | */ | |
557 | retry: | |
d2eb35ac | 558 | sectors = r1_bio->sectors; |
76073054 | 559 | best_disk = -1; |
9dedf603 | 560 | best_dist_disk = -1; |
76073054 | 561 | best_dist = MaxSector; |
9dedf603 SL |
562 | best_pending_disk = -1; |
563 | min_pending = UINT_MAX; | |
d2eb35ac | 564 | best_good_sectors = 0; |
9dedf603 | 565 | has_nonrot_disk = 0; |
12cee5a8 | 566 | choose_next_idle = 0; |
2e52d449 | 567 | clear_bit(R1BIO_FailFast, &r1_bio->state); |
d2eb35ac | 568 | |
7d49ffcf GR |
569 | if ((conf->mddev->recovery_cp < this_sector + sectors) || |
570 | (mddev_is_clustered(conf->mddev) && | |
90382ed9 | 571 | md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, |
7d49ffcf GR |
572 | this_sector + sectors))) |
573 | choose_first = 1; | |
574 | else | |
575 | choose_first = 0; | |
1da177e4 | 576 | |
be4d3280 | 577 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 578 | sector_t dist; |
d2eb35ac N |
579 | sector_t first_bad; |
580 | int bad_sectors; | |
9dedf603 | 581 | unsigned int pending; |
12cee5a8 | 582 | bool nonrot; |
d2eb35ac | 583 | |
f3ac8bf7 N |
584 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
585 | if (r1_bio->bios[disk] == IO_BLOCKED | |
586 | || rdev == NULL | |
76073054 | 587 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 588 | continue; |
76073054 N |
589 | if (!test_bit(In_sync, &rdev->flags) && |
590 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 591 | continue; |
76073054 N |
592 | if (test_bit(WriteMostly, &rdev->flags)) { |
593 | /* Don't balance among write-mostly, just | |
594 | * use the first as a last resort */ | |
d1901ef0 | 595 | if (best_dist_disk < 0) { |
307729c8 N |
596 | if (is_badblock(rdev, this_sector, sectors, |
597 | &first_bad, &bad_sectors)) { | |
816b0acf | 598 | if (first_bad <= this_sector) |
307729c8 N |
599 | /* Cannot use this */ |
600 | continue; | |
601 | best_good_sectors = first_bad - this_sector; | |
602 | } else | |
603 | best_good_sectors = sectors; | |
d1901ef0 TH |
604 | best_dist_disk = disk; |
605 | best_pending_disk = disk; | |
307729c8 | 606 | } |
76073054 N |
607 | continue; |
608 | } | |
609 | /* This is a reasonable device to use. It might | |
610 | * even be best. | |
611 | */ | |
d2eb35ac N |
612 | if (is_badblock(rdev, this_sector, sectors, |
613 | &first_bad, &bad_sectors)) { | |
614 | if (best_dist < MaxSector) | |
615 | /* already have a better device */ | |
616 | continue; | |
617 | if (first_bad <= this_sector) { | |
618 | /* cannot read here. If this is the 'primary' | |
619 | * device, then we must not read beyond | |
620 | * bad_sectors from another device.. | |
621 | */ | |
622 | bad_sectors -= (this_sector - first_bad); | |
623 | if (choose_first && sectors > bad_sectors) | |
624 | sectors = bad_sectors; | |
625 | if (best_good_sectors > sectors) | |
626 | best_good_sectors = sectors; | |
627 | ||
628 | } else { | |
629 | sector_t good_sectors = first_bad - this_sector; | |
630 | if (good_sectors > best_good_sectors) { | |
631 | best_good_sectors = good_sectors; | |
632 | best_disk = disk; | |
633 | } | |
634 | if (choose_first) | |
635 | break; | |
636 | } | |
637 | continue; | |
638 | } else | |
639 | best_good_sectors = sectors; | |
640 | ||
2e52d449 N |
641 | if (best_disk >= 0) |
642 | /* At least two disks to choose from so failfast is OK */ | |
643 | set_bit(R1BIO_FailFast, &r1_bio->state); | |
644 | ||
12cee5a8 SL |
645 | nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
646 | has_nonrot_disk |= nonrot; | |
9dedf603 | 647 | pending = atomic_read(&rdev->nr_pending); |
76073054 | 648 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
12cee5a8 | 649 | if (choose_first) { |
76073054 | 650 | best_disk = disk; |
1da177e4 LT |
651 | break; |
652 | } | |
12cee5a8 SL |
653 | /* Don't change to another disk for sequential reads */ |
654 | if (conf->mirrors[disk].next_seq_sect == this_sector | |
655 | || dist == 0) { | |
656 | int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; | |
657 | struct raid1_info *mirror = &conf->mirrors[disk]; | |
658 | ||
659 | best_disk = disk; | |
660 | /* | |
661 | * If buffered sequential IO size exceeds optimal | |
662 | * iosize, check if there is idle disk. If yes, choose | |
663 | * the idle disk. read_balance could already choose an | |
664 | * idle disk before noticing it's a sequential IO in | |
665 | * this disk. This doesn't matter because this disk | |
666 | * will idle, next time it will be utilized after the | |
667 | * first disk has IO size exceeds optimal iosize. In | |
668 | * this way, iosize of the first disk will be optimal | |
669 | * iosize at least. iosize of the second disk might be | |
670 | * small, but not a big deal since when the second disk | |
671 | * starts IO, the first disk is likely still busy. | |
672 | */ | |
673 | if (nonrot && opt_iosize > 0 && | |
674 | mirror->seq_start != MaxSector && | |
675 | mirror->next_seq_sect > opt_iosize && | |
676 | mirror->next_seq_sect - opt_iosize >= | |
677 | mirror->seq_start) { | |
678 | choose_next_idle = 1; | |
679 | continue; | |
680 | } | |
681 | break; | |
682 | } | |
12cee5a8 SL |
683 | |
684 | if (choose_next_idle) | |
685 | continue; | |
9dedf603 SL |
686 | |
687 | if (min_pending > pending) { | |
688 | min_pending = pending; | |
689 | best_pending_disk = disk; | |
690 | } | |
691 | ||
76073054 N |
692 | if (dist < best_dist) { |
693 | best_dist = dist; | |
9dedf603 | 694 | best_dist_disk = disk; |
1da177e4 | 695 | } |
f3ac8bf7 | 696 | } |
1da177e4 | 697 | |
9dedf603 SL |
698 | /* |
699 | * If all disks are rotational, choose the closest disk. If any disk is | |
700 | * non-rotational, choose the disk with less pending request even the | |
701 | * disk is rotational, which might/might not be optimal for raids with | |
702 | * mixed ratation/non-rotational disks depending on workload. | |
703 | */ | |
704 | if (best_disk == -1) { | |
2e52d449 | 705 | if (has_nonrot_disk || min_pending == 0) |
9dedf603 SL |
706 | best_disk = best_pending_disk; |
707 | else | |
708 | best_disk = best_dist_disk; | |
709 | } | |
710 | ||
76073054 N |
711 | if (best_disk >= 0) { |
712 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
713 | if (!rdev) |
714 | goto retry; | |
715 | atomic_inc(&rdev->nr_pending); | |
d2eb35ac | 716 | sectors = best_good_sectors; |
12cee5a8 SL |
717 | |
718 | if (conf->mirrors[best_disk].next_seq_sect != this_sector) | |
719 | conf->mirrors[best_disk].seq_start = this_sector; | |
720 | ||
be4d3280 | 721 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 LT |
722 | } |
723 | rcu_read_unlock(); | |
d2eb35ac | 724 | *max_sectors = sectors; |
1da177e4 | 725 | |
76073054 | 726 | return best_disk; |
1da177e4 LT |
727 | } |
728 | ||
5c675f83 | 729 | static int raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 730 | { |
e8096360 | 731 | struct r1conf *conf = mddev->private; |
0d129228 N |
732 | int i, ret = 0; |
733 | ||
4452226e | 734 | if ((bits & (1 << WB_async_congested)) && |
34db0cd6 N |
735 | conf->pending_count >= max_queued_requests) |
736 | return 1; | |
737 | ||
0d129228 | 738 | rcu_read_lock(); |
f53e29fc | 739 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 740 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 741 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 742 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 743 | |
1ed7242e JB |
744 | BUG_ON(!q); |
745 | ||
0d129228 N |
746 | /* Note the '|| 1' - when read_balance prefers |
747 | * non-congested targets, it can be removed | |
748 | */ | |
4452226e | 749 | if ((bits & (1 << WB_async_congested)) || 1) |
dc3b17cc | 750 | ret |= bdi_congested(q->backing_dev_info, bits); |
0d129228 | 751 | else |
dc3b17cc | 752 | ret &= bdi_congested(q->backing_dev_info, bits); |
0d129228 N |
753 | } |
754 | } | |
755 | rcu_read_unlock(); | |
756 | return ret; | |
757 | } | |
0d129228 | 758 | |
e8096360 | 759 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
760 | { |
761 | /* Any writes that have been queued but are awaiting | |
762 | * bitmap updates get flushed here. | |
a35e63ef | 763 | */ |
a35e63ef N |
764 | spin_lock_irq(&conf->device_lock); |
765 | ||
766 | if (conf->pending_bio_list.head) { | |
767 | struct bio *bio; | |
768 | bio = bio_list_get(&conf->pending_bio_list); | |
34db0cd6 | 769 | conf->pending_count = 0; |
a35e63ef N |
770 | spin_unlock_irq(&conf->device_lock); |
771 | /* flush any pending bitmap writes to | |
772 | * disk before proceeding w/ I/O */ | |
773 | bitmap_unplug(conf->mddev->bitmap); | |
34db0cd6 | 774 | wake_up(&conf->wait_barrier); |
a35e63ef N |
775 | |
776 | while (bio) { /* submit pending writes */ | |
777 | struct bio *next = bio->bi_next; | |
5e2c7a36 | 778 | struct md_rdev *rdev = (void*)bio->bi_bdev; |
a35e63ef | 779 | bio->bi_next = NULL; |
5e2c7a36 N |
780 | bio->bi_bdev = rdev->bdev; |
781 | if (test_bit(Faulty, &rdev->flags)) { | |
782 | bio->bi_error = -EIO; | |
783 | bio_endio(bio); | |
784 | } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && | |
785 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) | |
2ff8cc2c | 786 | /* Just ignore it */ |
4246a0b6 | 787 | bio_endio(bio); |
2ff8cc2c SL |
788 | else |
789 | generic_make_request(bio); | |
a35e63ef N |
790 | bio = next; |
791 | } | |
a35e63ef N |
792 | } else |
793 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
794 | } |
795 | ||
17999be4 N |
796 | /* Barriers.... |
797 | * Sometimes we need to suspend IO while we do something else, | |
798 | * either some resync/recovery, or reconfigure the array. | |
799 | * To do this we raise a 'barrier'. | |
800 | * The 'barrier' is a counter that can be raised multiple times | |
801 | * to count how many activities are happening which preclude | |
802 | * normal IO. | |
803 | * We can only raise the barrier if there is no pending IO. | |
804 | * i.e. if nr_pending == 0. | |
805 | * We choose only to raise the barrier if no-one is waiting for the | |
806 | * barrier to go down. This means that as soon as an IO request | |
807 | * is ready, no other operations which require a barrier will start | |
808 | * until the IO request has had a chance. | |
809 | * | |
810 | * So: regular IO calls 'wait_barrier'. When that returns there | |
811 | * is no backgroup IO happening, It must arrange to call | |
812 | * allow_barrier when it has finished its IO. | |
813 | * backgroup IO calls must call raise_barrier. Once that returns | |
814 | * there is no normal IO happeing. It must arrange to call | |
815 | * lower_barrier when the particular background IO completes. | |
1da177e4 | 816 | */ |
c2fd4c94 | 817 | static void raise_barrier(struct r1conf *conf, sector_t sector_nr) |
1da177e4 | 818 | { |
fd76863e | 819 | int idx = sector_to_idx(sector_nr); |
820 | ||
1da177e4 | 821 | spin_lock_irq(&conf->resync_lock); |
17999be4 N |
822 | |
823 | /* Wait until no block IO is waiting */ | |
824e47da | 824 | wait_event_lock_irq(conf->wait_barrier, |
825 | !atomic_read(&conf->nr_waiting[idx]), | |
eed8c02e | 826 | conf->resync_lock); |
17999be4 N |
827 | |
828 | /* block any new IO from starting */ | |
824e47da | 829 | atomic_inc(&conf->barrier[idx]); |
830 | /* | |
831 | * In raise_barrier() we firstly increase conf->barrier[idx] then | |
832 | * check conf->nr_pending[idx]. In _wait_barrier() we firstly | |
833 | * increase conf->nr_pending[idx] then check conf->barrier[idx]. | |
834 | * A memory barrier here to make sure conf->nr_pending[idx] won't | |
835 | * be fetched before conf->barrier[idx] is increased. Otherwise | |
836 | * there will be a race between raise_barrier() and _wait_barrier(). | |
837 | */ | |
838 | smp_mb__after_atomic(); | |
17999be4 | 839 | |
79ef3a8a | 840 | /* For these conditions we must wait: |
841 | * A: while the array is in frozen state | |
fd76863e | 842 | * B: while conf->nr_pending[idx] is not 0, meaning regular I/O |
843 | * existing in corresponding I/O barrier bucket. | |
844 | * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches | |
845 | * max resync count which allowed on current I/O barrier bucket. | |
79ef3a8a | 846 | */ |
17999be4 | 847 | wait_event_lock_irq(conf->wait_barrier, |
b364e3d0 | 848 | !conf->array_frozen && |
824e47da | 849 | !atomic_read(&conf->nr_pending[idx]) && |
850 | atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH, | |
eed8c02e | 851 | conf->resync_lock); |
17999be4 | 852 | |
824e47da | 853 | atomic_inc(&conf->nr_pending[idx]); |
17999be4 N |
854 | spin_unlock_irq(&conf->resync_lock); |
855 | } | |
856 | ||
fd76863e | 857 | static void lower_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 858 | { |
fd76863e | 859 | int idx = sector_to_idx(sector_nr); |
860 | ||
824e47da | 861 | BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); |
fd76863e | 862 | |
824e47da | 863 | atomic_dec(&conf->barrier[idx]); |
864 | atomic_dec(&conf->nr_pending[idx]); | |
17999be4 N |
865 | wake_up(&conf->wait_barrier); |
866 | } | |
867 | ||
fd76863e | 868 | static void _wait_barrier(struct r1conf *conf, int idx) |
17999be4 | 869 | { |
824e47da | 870 | /* |
871 | * We need to increase conf->nr_pending[idx] very early here, | |
872 | * then raise_barrier() can be blocked when it waits for | |
873 | * conf->nr_pending[idx] to be 0. Then we can avoid holding | |
874 | * conf->resync_lock when there is no barrier raised in same | |
875 | * barrier unit bucket. Also if the array is frozen, I/O | |
876 | * should be blocked until array is unfrozen. | |
877 | */ | |
878 | atomic_inc(&conf->nr_pending[idx]); | |
879 | /* | |
880 | * In _wait_barrier() we firstly increase conf->nr_pending[idx], then | |
881 | * check conf->barrier[idx]. In raise_barrier() we firstly increase | |
882 | * conf->barrier[idx], then check conf->nr_pending[idx]. A memory | |
883 | * barrier is necessary here to make sure conf->barrier[idx] won't be | |
884 | * fetched before conf->nr_pending[idx] is increased. Otherwise there | |
885 | * will be a race between _wait_barrier() and raise_barrier(). | |
886 | */ | |
887 | smp_mb__after_atomic(); | |
79ef3a8a | 888 | |
824e47da | 889 | /* |
890 | * Don't worry about checking two atomic_t variables at same time | |
891 | * here. If during we check conf->barrier[idx], the array is | |
892 | * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is | |
893 | * 0, it is safe to return and make the I/O continue. Because the | |
894 | * array is frozen, all I/O returned here will eventually complete | |
895 | * or be queued, no race will happen. See code comment in | |
896 | * frozen_array(). | |
897 | */ | |
898 | if (!READ_ONCE(conf->array_frozen) && | |
899 | !atomic_read(&conf->barrier[idx])) | |
900 | return; | |
79ef3a8a | 901 | |
824e47da | 902 | /* |
903 | * After holding conf->resync_lock, conf->nr_pending[idx] | |
904 | * should be decreased before waiting for barrier to drop. | |
905 | * Otherwise, we may encounter a race condition because | |
906 | * raise_barrer() might be waiting for conf->nr_pending[idx] | |
907 | * to be 0 at same time. | |
908 | */ | |
909 | spin_lock_irq(&conf->resync_lock); | |
910 | atomic_inc(&conf->nr_waiting[idx]); | |
911 | atomic_dec(&conf->nr_pending[idx]); | |
912 | /* | |
913 | * In case freeze_array() is waiting for | |
914 | * get_unqueued_pending() == extra | |
915 | */ | |
916 | wake_up(&conf->wait_barrier); | |
917 | /* Wait for the barrier in same barrier unit bucket to drop. */ | |
918 | wait_event_lock_irq(conf->wait_barrier, | |
919 | !conf->array_frozen && | |
920 | !atomic_read(&conf->barrier[idx]), | |
921 | conf->resync_lock); | |
922 | atomic_inc(&conf->nr_pending[idx]); | |
923 | atomic_dec(&conf->nr_waiting[idx]); | |
fd76863e | 924 | spin_unlock_irq(&conf->resync_lock); |
79ef3a8a | 925 | } |
926 | ||
fd76863e | 927 | static void wait_read_barrier(struct r1conf *conf, sector_t sector_nr) |
79ef3a8a | 928 | { |
fd76863e | 929 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 930 | |
824e47da | 931 | /* |
932 | * Very similar to _wait_barrier(). The difference is, for read | |
933 | * I/O we don't need wait for sync I/O, but if the whole array | |
934 | * is frozen, the read I/O still has to wait until the array is | |
935 | * unfrozen. Since there is no ordering requirement with | |
936 | * conf->barrier[idx] here, memory barrier is unnecessary as well. | |
937 | */ | |
938 | atomic_inc(&conf->nr_pending[idx]); | |
79ef3a8a | 939 | |
824e47da | 940 | if (!READ_ONCE(conf->array_frozen)) |
941 | return; | |
942 | ||
943 | spin_lock_irq(&conf->resync_lock); | |
944 | atomic_inc(&conf->nr_waiting[idx]); | |
945 | atomic_dec(&conf->nr_pending[idx]); | |
946 | /* | |
947 | * In case freeze_array() is waiting for | |
948 | * get_unqueued_pending() == extra | |
949 | */ | |
950 | wake_up(&conf->wait_barrier); | |
951 | /* Wait for array to be unfrozen */ | |
952 | wait_event_lock_irq(conf->wait_barrier, | |
953 | !conf->array_frozen, | |
954 | conf->resync_lock); | |
955 | atomic_inc(&conf->nr_pending[idx]); | |
956 | atomic_dec(&conf->nr_waiting[idx]); | |
1da177e4 LT |
957 | spin_unlock_irq(&conf->resync_lock); |
958 | } | |
959 | ||
37011e3a N |
960 | static void inc_pending(struct r1conf *conf, sector_t bi_sector) |
961 | { | |
962 | /* The current request requires multiple r1_bio, so | |
963 | * we need to increment the pending count, and the corresponding | |
964 | * window count. | |
965 | */ | |
966 | int idx = sector_to_idx(bi_sector); | |
967 | atomic_inc(&conf->nr_pending[idx]); | |
968 | } | |
969 | ||
fd76863e | 970 | static void wait_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 971 | { |
fd76863e | 972 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 973 | |
fd76863e | 974 | _wait_barrier(conf, idx); |
975 | } | |
976 | ||
977 | static void wait_all_barriers(struct r1conf *conf) | |
978 | { | |
979 | int idx; | |
980 | ||
981 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) | |
982 | _wait_barrier(conf, idx); | |
983 | } | |
984 | ||
985 | static void _allow_barrier(struct r1conf *conf, int idx) | |
17999be4 | 986 | { |
824e47da | 987 | atomic_dec(&conf->nr_pending[idx]); |
17999be4 N |
988 | wake_up(&conf->wait_barrier); |
989 | } | |
990 | ||
fd76863e | 991 | static void allow_barrier(struct r1conf *conf, sector_t sector_nr) |
992 | { | |
993 | int idx = sector_to_idx(sector_nr); | |
994 | ||
995 | _allow_barrier(conf, idx); | |
996 | } | |
997 | ||
998 | static void allow_all_barriers(struct r1conf *conf) | |
999 | { | |
1000 | int idx; | |
1001 | ||
1002 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) | |
1003 | _allow_barrier(conf, idx); | |
1004 | } | |
1005 | ||
1006 | /* conf->resync_lock should be held */ | |
1007 | static int get_unqueued_pending(struct r1conf *conf) | |
1008 | { | |
1009 | int idx, ret; | |
1010 | ||
1011 | for (ret = 0, idx = 0; idx < BARRIER_BUCKETS_NR; idx++) | |
824e47da | 1012 | ret += atomic_read(&conf->nr_pending[idx]) - |
1013 | atomic_read(&conf->nr_queued[idx]); | |
fd76863e | 1014 | |
1015 | return ret; | |
1016 | } | |
1017 | ||
e2d59925 | 1018 | static void freeze_array(struct r1conf *conf, int extra) |
ddaf22ab | 1019 | { |
fd76863e | 1020 | /* Stop sync I/O and normal I/O and wait for everything to |
11353b9d | 1021 | * go quiet. |
fd76863e | 1022 | * This is called in two situations: |
1023 | * 1) management command handlers (reshape, remove disk, quiesce). | |
1024 | * 2) one normal I/O request failed. | |
1025 | ||
1026 | * After array_frozen is set to 1, new sync IO will be blocked at | |
1027 | * raise_barrier(), and new normal I/O will blocked at _wait_barrier() | |
1028 | * or wait_read_barrier(). The flying I/Os will either complete or be | |
1029 | * queued. When everything goes quite, there are only queued I/Os left. | |
1030 | ||
1031 | * Every flying I/O contributes to a conf->nr_pending[idx], idx is the | |
1032 | * barrier bucket index which this I/O request hits. When all sync and | |
1033 | * normal I/O are queued, sum of all conf->nr_pending[] will match sum | |
1034 | * of all conf->nr_queued[]. But normal I/O failure is an exception, | |
1035 | * in handle_read_error(), we may call freeze_array() before trying to | |
1036 | * fix the read error. In this case, the error read I/O is not queued, | |
1037 | * so get_unqueued_pending() == 1. | |
1038 | * | |
1039 | * Therefore before this function returns, we need to wait until | |
1040 | * get_unqueued_pendings(conf) gets equal to extra. For | |
1041 | * normal I/O context, extra is 1, in rested situations extra is 0. | |
ddaf22ab N |
1042 | */ |
1043 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1044 | conf->array_frozen = 1; |
578b54ad | 1045 | raid1_log(conf->mddev, "wait freeze"); |
fd76863e | 1046 | wait_event_lock_irq_cmd( |
1047 | conf->wait_barrier, | |
1048 | get_unqueued_pending(conf) == extra, | |
1049 | conf->resync_lock, | |
1050 | flush_pending_writes(conf)); | |
ddaf22ab N |
1051 | spin_unlock_irq(&conf->resync_lock); |
1052 | } | |
e8096360 | 1053 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
1054 | { |
1055 | /* reverse the effect of the freeze */ | |
1056 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1057 | conf->array_frozen = 0; |
ddaf22ab | 1058 | spin_unlock_irq(&conf->resync_lock); |
824e47da | 1059 | wake_up(&conf->wait_barrier); |
ddaf22ab N |
1060 | } |
1061 | ||
f72ffdd6 | 1062 | /* duplicate the data pages for behind I/O |
4e78064f | 1063 | */ |
9f2c9d12 | 1064 | static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) |
4b6d287f N |
1065 | { |
1066 | int i; | |
1067 | struct bio_vec *bvec; | |
2ca68f5e | 1068 | struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), |
4b6d287f | 1069 | GFP_NOIO); |
2ca68f5e | 1070 | if (unlikely(!bvecs)) |
af6d7b76 | 1071 | return; |
4b6d287f | 1072 | |
cb34e057 | 1073 | bio_for_each_segment_all(bvec, bio, i) { |
2ca68f5e N |
1074 | bvecs[i] = *bvec; |
1075 | bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
1076 | if (unlikely(!bvecs[i].bv_page)) | |
4b6d287f | 1077 | goto do_sync_io; |
2ca68f5e N |
1078 | memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, |
1079 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
1080 | kunmap(bvecs[i].bv_page); | |
4b6d287f N |
1081 | kunmap(bvec->bv_page); |
1082 | } | |
2ca68f5e | 1083 | r1_bio->behind_bvecs = bvecs; |
af6d7b76 N |
1084 | r1_bio->behind_page_count = bio->bi_vcnt; |
1085 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
1086 | return; | |
4b6d287f N |
1087 | |
1088 | do_sync_io: | |
af6d7b76 | 1089 | for (i = 0; i < bio->bi_vcnt; i++) |
2ca68f5e N |
1090 | if (bvecs[i].bv_page) |
1091 | put_page(bvecs[i].bv_page); | |
1092 | kfree(bvecs); | |
4f024f37 KO |
1093 | pr_debug("%dB behind alloc failed, doing sync I/O\n", |
1094 | bio->bi_iter.bi_size); | |
4b6d287f N |
1095 | } |
1096 | ||
f54a9d0e N |
1097 | struct raid1_plug_cb { |
1098 | struct blk_plug_cb cb; | |
1099 | struct bio_list pending; | |
1100 | int pending_cnt; | |
1101 | }; | |
1102 | ||
1103 | static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
1104 | { | |
1105 | struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, | |
1106 | cb); | |
1107 | struct mddev *mddev = plug->cb.data; | |
1108 | struct r1conf *conf = mddev->private; | |
1109 | struct bio *bio; | |
1110 | ||
874807a8 | 1111 | if (from_schedule || current->bio_list) { |
f54a9d0e N |
1112 | spin_lock_irq(&conf->device_lock); |
1113 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
1114 | conf->pending_count += plug->pending_cnt; | |
1115 | spin_unlock_irq(&conf->device_lock); | |
ee0b0244 | 1116 | wake_up(&conf->wait_barrier); |
f54a9d0e N |
1117 | md_wakeup_thread(mddev->thread); |
1118 | kfree(plug); | |
1119 | return; | |
1120 | } | |
1121 | ||
1122 | /* we aren't scheduling, so we can do the write-out directly. */ | |
1123 | bio = bio_list_get(&plug->pending); | |
1124 | bitmap_unplug(mddev->bitmap); | |
1125 | wake_up(&conf->wait_barrier); | |
1126 | ||
1127 | while (bio) { /* submit pending writes */ | |
1128 | struct bio *next = bio->bi_next; | |
5e2c7a36 | 1129 | struct md_rdev *rdev = (void*)bio->bi_bdev; |
f54a9d0e | 1130 | bio->bi_next = NULL; |
5e2c7a36 N |
1131 | bio->bi_bdev = rdev->bdev; |
1132 | if (test_bit(Faulty, &rdev->flags)) { | |
1133 | bio->bi_error = -EIO; | |
1134 | bio_endio(bio); | |
1135 | } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && | |
1136 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) | |
32f9f570 | 1137 | /* Just ignore it */ |
4246a0b6 | 1138 | bio_endio(bio); |
32f9f570 SL |
1139 | else |
1140 | generic_make_request(bio); | |
f54a9d0e N |
1141 | bio = next; |
1142 | } | |
1143 | kfree(plug); | |
1144 | } | |
1145 | ||
fd76863e | 1146 | static inline struct r1bio * |
1147 | alloc_r1bio(struct mddev *mddev, struct bio *bio, sector_t sectors_handled) | |
1148 | { | |
1149 | struct r1conf *conf = mddev->private; | |
1150 | struct r1bio *r1_bio; | |
1151 | ||
1152 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1153 | ||
1154 | r1_bio->master_bio = bio; | |
1155 | r1_bio->sectors = bio_sectors(bio) - sectors_handled; | |
1156 | r1_bio->state = 0; | |
1157 | r1_bio->mddev = mddev; | |
1158 | r1_bio->sector = bio->bi_iter.bi_sector + sectors_handled; | |
1159 | ||
1160 | return r1_bio; | |
1161 | } | |
1162 | ||
1163 | static void raid1_read_request(struct mddev *mddev, struct bio *bio) | |
1da177e4 | 1164 | { |
e8096360 | 1165 | struct r1conf *conf = mddev->private; |
0eaf822c | 1166 | struct raid1_info *mirror; |
fd76863e | 1167 | struct r1bio *r1_bio; |
1da177e4 | 1168 | struct bio *read_bio; |
3b046a97 RL |
1169 | struct bitmap *bitmap = mddev->bitmap; |
1170 | const int op = bio_op(bio); | |
1171 | const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); | |
1172 | int sectors_handled; | |
1173 | int max_sectors; | |
1174 | int rdisk; | |
1175 | ||
fd76863e | 1176 | /* |
1177 | * Still need barrier for READ in case that whole | |
1178 | * array is frozen. | |
1179 | */ | |
1180 | wait_read_barrier(conf, bio->bi_iter.bi_sector); | |
1181 | ||
1182 | r1_bio = alloc_r1bio(mddev, bio, 0); | |
3b046a97 | 1183 | |
fd76863e | 1184 | /* |
1185 | * make_request() can abort the operation when read-ahead is being | |
1186 | * used and no empty request is available. | |
1187 | */ | |
3b046a97 RL |
1188 | read_again: |
1189 | rdisk = read_balance(conf, r1_bio, &max_sectors); | |
1190 | ||
1191 | if (rdisk < 0) { | |
1192 | /* couldn't find anywhere to read from */ | |
1193 | raid_end_bio_io(r1_bio); | |
1194 | return; | |
1195 | } | |
1196 | mirror = conf->mirrors + rdisk; | |
1197 | ||
1198 | if (test_bit(WriteMostly, &mirror->rdev->flags) && | |
1199 | bitmap) { | |
1200 | /* | |
1201 | * Reading from a write-mostly device must take care not to | |
1202 | * over-take any writes that are 'behind' | |
1203 | */ | |
1204 | raid1_log(mddev, "wait behind writes"); | |
1205 | wait_event(bitmap->behind_wait, | |
1206 | atomic_read(&bitmap->behind_writes) == 0); | |
1207 | } | |
1208 | r1_bio->read_disk = rdisk; | |
3b046a97 | 1209 | |
d7a10308 | 1210 | read_bio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set); |
3b046a97 RL |
1211 | bio_trim(read_bio, r1_bio->sector - bio->bi_iter.bi_sector, |
1212 | max_sectors); | |
1213 | ||
1214 | r1_bio->bios[rdisk] = read_bio; | |
1215 | ||
1216 | read_bio->bi_iter.bi_sector = r1_bio->sector + | |
1217 | mirror->rdev->data_offset; | |
1218 | read_bio->bi_bdev = mirror->rdev->bdev; | |
1219 | read_bio->bi_end_io = raid1_end_read_request; | |
1220 | bio_set_op_attrs(read_bio, op, do_sync); | |
1221 | if (test_bit(FailFast, &mirror->rdev->flags) && | |
1222 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
1223 | read_bio->bi_opf |= MD_FAILFAST; | |
1224 | read_bio->bi_private = r1_bio; | |
1225 | ||
1226 | if (mddev->gendisk) | |
1227 | trace_block_bio_remap(bdev_get_queue(read_bio->bi_bdev), | |
1228 | read_bio, disk_devt(mddev->gendisk), | |
1229 | r1_bio->sector); | |
1230 | ||
1231 | if (max_sectors < r1_bio->sectors) { | |
1232 | /* | |
1233 | * could not read all from this device, so we will need another | |
1234 | * r1_bio. | |
1235 | */ | |
1236 | sectors_handled = (r1_bio->sector + max_sectors | |
1237 | - bio->bi_iter.bi_sector); | |
1238 | r1_bio->sectors = max_sectors; | |
37011e3a | 1239 | bio_inc_remaining(bio); |
3b046a97 RL |
1240 | |
1241 | /* | |
1242 | * Cannot call generic_make_request directly as that will be | |
1243 | * queued in __make_request and subsequent mempool_alloc might | |
1244 | * block waiting for it. So hand bio over to raid1d. | |
1245 | */ | |
1246 | reschedule_retry(r1_bio); | |
1247 | ||
fd76863e | 1248 | r1_bio = alloc_r1bio(mddev, bio, sectors_handled); |
3b046a97 RL |
1249 | goto read_again; |
1250 | } else | |
1251 | generic_make_request(read_bio); | |
1252 | } | |
1253 | ||
fd76863e | 1254 | static void raid1_write_request(struct mddev *mddev, struct bio *bio) |
3b046a97 RL |
1255 | { |
1256 | struct r1conf *conf = mddev->private; | |
fd76863e | 1257 | struct r1bio *r1_bio; |
1f68f0c4 | 1258 | int i, disks; |
3b046a97 | 1259 | struct bitmap *bitmap = mddev->bitmap; |
191ea9b2 | 1260 | unsigned long flags; |
3cb03002 | 1261 | struct md_rdev *blocked_rdev; |
f54a9d0e N |
1262 | struct blk_plug_cb *cb; |
1263 | struct raid1_plug_cb *plug = NULL; | |
1f68f0c4 N |
1264 | int first_clone; |
1265 | int sectors_handled; | |
1266 | int max_sectors; | |
191ea9b2 | 1267 | |
1da177e4 LT |
1268 | /* |
1269 | * Register the new request and wait if the reconstruction | |
1270 | * thread has put up a bar for new requests. | |
1271 | * Continue immediately if no resync is active currently. | |
1272 | */ | |
62de608d | 1273 | |
3d310eb7 N |
1274 | md_write_start(mddev, bio); /* wait on superblock update early */ |
1275 | ||
3b046a97 | 1276 | if ((bio_end_sector(bio) > mddev->suspend_lo && |
589a1c49 GR |
1277 | bio->bi_iter.bi_sector < mddev->suspend_hi) || |
1278 | (mddev_is_clustered(mddev) && | |
90382ed9 | 1279 | md_cluster_ops->area_resyncing(mddev, WRITE, |
3b046a97 RL |
1280 | bio->bi_iter.bi_sector, bio_end_sector(bio)))) { |
1281 | ||
1282 | /* | |
1283 | * As the suspend_* range is controlled by userspace, we want | |
1284 | * an interruptible wait. | |
6eef4b21 N |
1285 | */ |
1286 | DEFINE_WAIT(w); | |
1287 | for (;;) { | |
1288 | flush_signals(current); | |
1289 | prepare_to_wait(&conf->wait_barrier, | |
1290 | &w, TASK_INTERRUPTIBLE); | |
f73a1c7d | 1291 | if (bio_end_sector(bio) <= mddev->suspend_lo || |
589a1c49 GR |
1292 | bio->bi_iter.bi_sector >= mddev->suspend_hi || |
1293 | (mddev_is_clustered(mddev) && | |
90382ed9 | 1294 | !md_cluster_ops->area_resyncing(mddev, WRITE, |
3b046a97 RL |
1295 | bio->bi_iter.bi_sector, |
1296 | bio_end_sector(bio)))) | |
6eef4b21 N |
1297 | break; |
1298 | schedule(); | |
1299 | } | |
1300 | finish_wait(&conf->wait_barrier, &w); | |
1301 | } | |
fd76863e | 1302 | wait_barrier(conf, bio->bi_iter.bi_sector); |
1303 | ||
1304 | r1_bio = alloc_r1bio(mddev, bio, 0); | |
1305 | ||
34db0cd6 N |
1306 | if (conf->pending_count >= max_queued_requests) { |
1307 | md_wakeup_thread(mddev->thread); | |
578b54ad | 1308 | raid1_log(mddev, "wait queued"); |
34db0cd6 N |
1309 | wait_event(conf->wait_barrier, |
1310 | conf->pending_count < max_queued_requests); | |
1311 | } | |
1f68f0c4 | 1312 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1313 | * inc refcount on their rdev. Record them by setting |
1314 | * bios[x] to bio | |
1f68f0c4 N |
1315 | * If there are known/acknowledged bad blocks on any device on |
1316 | * which we have seen a write error, we want to avoid writing those | |
1317 | * blocks. | |
1318 | * This potentially requires several writes to write around | |
1319 | * the bad blocks. Each set of writes gets it's own r1bio | |
1320 | * with a set of bios attached. | |
1da177e4 | 1321 | */ |
c3b328ac | 1322 | |
8f19ccb2 | 1323 | disks = conf->raid_disks * 2; |
6bfe0b49 DW |
1324 | retry_write: |
1325 | blocked_rdev = NULL; | |
1da177e4 | 1326 | rcu_read_lock(); |
1f68f0c4 | 1327 | max_sectors = r1_bio->sectors; |
1da177e4 | 1328 | for (i = 0; i < disks; i++) { |
3cb03002 | 1329 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
1330 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1331 | atomic_inc(&rdev->nr_pending); | |
1332 | blocked_rdev = rdev; | |
1333 | break; | |
1334 | } | |
1f68f0c4 | 1335 | r1_bio->bios[i] = NULL; |
8ae12666 | 1336 | if (!rdev || test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
1337 | if (i < conf->raid_disks) |
1338 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1339 | continue; |
1340 | } | |
1341 | ||
1342 | atomic_inc(&rdev->nr_pending); | |
1343 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1344 | sector_t first_bad; | |
1345 | int bad_sectors; | |
1346 | int is_bad; | |
1347 | ||
3b046a97 | 1348 | is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, |
1f68f0c4 N |
1349 | &first_bad, &bad_sectors); |
1350 | if (is_bad < 0) { | |
1351 | /* mustn't write here until the bad block is | |
1352 | * acknowledged*/ | |
1353 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1354 | blocked_rdev = rdev; | |
1355 | break; | |
1356 | } | |
1357 | if (is_bad && first_bad <= r1_bio->sector) { | |
1358 | /* Cannot write here at all */ | |
1359 | bad_sectors -= (r1_bio->sector - first_bad); | |
1360 | if (bad_sectors < max_sectors) | |
1361 | /* mustn't write more than bad_sectors | |
1362 | * to other devices yet | |
1363 | */ | |
1364 | max_sectors = bad_sectors; | |
03c902e1 | 1365 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1366 | /* We don't set R1BIO_Degraded as that |
1367 | * only applies if the disk is | |
1368 | * missing, so it might be re-added, | |
1369 | * and we want to know to recover this | |
1370 | * chunk. | |
1371 | * In this case the device is here, | |
1372 | * and the fact that this chunk is not | |
1373 | * in-sync is recorded in the bad | |
1374 | * block log | |
1375 | */ | |
1376 | continue; | |
964147d5 | 1377 | } |
1f68f0c4 N |
1378 | if (is_bad) { |
1379 | int good_sectors = first_bad - r1_bio->sector; | |
1380 | if (good_sectors < max_sectors) | |
1381 | max_sectors = good_sectors; | |
1382 | } | |
1383 | } | |
1384 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1385 | } |
1386 | rcu_read_unlock(); | |
1387 | ||
6bfe0b49 DW |
1388 | if (unlikely(blocked_rdev)) { |
1389 | /* Wait for this device to become unblocked */ | |
1390 | int j; | |
1391 | ||
1392 | for (j = 0; j < i; j++) | |
1393 | if (r1_bio->bios[j]) | |
1394 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1395 | r1_bio->state = 0; |
fd76863e | 1396 | allow_barrier(conf, bio->bi_iter.bi_sector); |
578b54ad | 1397 | raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); |
6bfe0b49 | 1398 | md_wait_for_blocked_rdev(blocked_rdev, mddev); |
fd76863e | 1399 | wait_barrier(conf, bio->bi_iter.bi_sector); |
6bfe0b49 DW |
1400 | goto retry_write; |
1401 | } | |
1402 | ||
6b6c8110 | 1403 | if (max_sectors < r1_bio->sectors) |
1f68f0c4 | 1404 | r1_bio->sectors = max_sectors; |
6b6c8110 | 1405 | |
4f024f37 | 1406 | sectors_handled = r1_bio->sector + max_sectors - bio->bi_iter.bi_sector; |
4b6d287f | 1407 | |
4e78064f | 1408 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1409 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1410 | |
1f68f0c4 | 1411 | first_clone = 1; |
1da177e4 | 1412 | for (i = 0; i < disks; i++) { |
8e58e327 ML |
1413 | struct bio *mbio = NULL; |
1414 | sector_t offset; | |
1da177e4 LT |
1415 | if (!r1_bio->bios[i]) |
1416 | continue; | |
1417 | ||
8e58e327 | 1418 | offset = r1_bio->sector - bio->bi_iter.bi_sector; |
1f68f0c4 N |
1419 | |
1420 | if (first_clone) { | |
1421 | /* do behind I/O ? | |
1422 | * Not if there are too many, or cannot | |
1423 | * allocate memory, or a reader on WriteMostly | |
1424 | * is waiting for behind writes to flush */ | |
1425 | if (bitmap && | |
1426 | (atomic_read(&bitmap->behind_writes) | |
1427 | < mddev->bitmap_info.max_write_behind) && | |
8e58e327 ML |
1428 | !waitqueue_active(&bitmap->behind_wait)) { |
1429 | mbio = bio_clone_bioset_partial(bio, GFP_NOIO, | |
1430 | mddev->bio_set, | |
1ec49223 SL |
1431 | offset << 9, |
1432 | max_sectors << 9); | |
1f68f0c4 | 1433 | alloc_behind_pages(mbio, r1_bio); |
8e58e327 | 1434 | } |
1f68f0c4 N |
1435 | |
1436 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1437 | r1_bio->sectors, | |
1438 | test_bit(R1BIO_BehindIO, | |
1439 | &r1_bio->state)); | |
1440 | first_clone = 0; | |
1441 | } | |
8e58e327 ML |
1442 | |
1443 | if (!mbio) { | |
1ec49223 SL |
1444 | if (r1_bio->behind_bvecs) |
1445 | mbio = bio_clone_bioset_partial(bio, GFP_NOIO, | |
1446 | mddev->bio_set, | |
1447 | offset << 9, | |
1448 | max_sectors << 9); | |
1449 | else { | |
1450 | mbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set); | |
1451 | bio_trim(mbio, offset, max_sectors); | |
1452 | } | |
8e58e327 ML |
1453 | } |
1454 | ||
2ca68f5e | 1455 | if (r1_bio->behind_bvecs) { |
4b6d287f N |
1456 | struct bio_vec *bvec; |
1457 | int j; | |
1458 | ||
cb34e057 KO |
1459 | /* |
1460 | * We trimmed the bio, so _all is legit | |
4b6d287f | 1461 | */ |
d74c6d51 | 1462 | bio_for_each_segment_all(bvec, mbio, j) |
2ca68f5e | 1463 | bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; |
4b6d287f N |
1464 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1465 | atomic_inc(&r1_bio->behind_remaining); | |
1466 | } | |
1467 | ||
1f68f0c4 N |
1468 | r1_bio->bios[i] = mbio; |
1469 | ||
4f024f37 | 1470 | mbio->bi_iter.bi_sector = (r1_bio->sector + |
1f68f0c4 | 1471 | conf->mirrors[i].rdev->data_offset); |
109e3765 | 1472 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; |
1f68f0c4 | 1473 | mbio->bi_end_io = raid1_end_write_request; |
a682e003 | 1474 | mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); |
212e7eb7 N |
1475 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && |
1476 | !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && | |
1477 | conf->raid_disks - mddev->degraded > 1) | |
1478 | mbio->bi_opf |= MD_FAILFAST; | |
1f68f0c4 N |
1479 | mbio->bi_private = r1_bio; |
1480 | ||
1da177e4 | 1481 | atomic_inc(&r1_bio->remaining); |
f54a9d0e | 1482 | |
109e3765 N |
1483 | if (mddev->gendisk) |
1484 | trace_block_bio_remap(bdev_get_queue(mbio->bi_bdev), | |
1485 | mbio, disk_devt(mddev->gendisk), | |
1486 | r1_bio->sector); | |
1487 | /* flush_pending_writes() needs access to the rdev so...*/ | |
1488 | mbio->bi_bdev = (void*)conf->mirrors[i].rdev; | |
1489 | ||
f54a9d0e N |
1490 | cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); |
1491 | if (cb) | |
1492 | plug = container_of(cb, struct raid1_plug_cb, cb); | |
1493 | else | |
1494 | plug = NULL; | |
4e78064f | 1495 | spin_lock_irqsave(&conf->device_lock, flags); |
f54a9d0e N |
1496 | if (plug) { |
1497 | bio_list_add(&plug->pending, mbio); | |
1498 | plug->pending_cnt++; | |
1499 | } else { | |
1500 | bio_list_add(&conf->pending_bio_list, mbio); | |
1501 | conf->pending_count++; | |
1502 | } | |
4e78064f | 1503 | spin_unlock_irqrestore(&conf->device_lock, flags); |
f54a9d0e | 1504 | if (!plug) |
b357f04a | 1505 | md_wakeup_thread(mddev->thread); |
1da177e4 | 1506 | } |
079fa166 N |
1507 | /* Mustn't call r1_bio_write_done before this next test, |
1508 | * as it could result in the bio being freed. | |
1509 | */ | |
aa8b57aa | 1510 | if (sectors_handled < bio_sectors(bio)) { |
37011e3a N |
1511 | /* We need another r1_bio, which must be counted */ |
1512 | sector_t sect = bio->bi_iter.bi_sector + sectors_handled; | |
6b6c8110 | 1513 | |
37011e3a N |
1514 | inc_pending(conf, sect); |
1515 | bio_inc_remaining(bio); | |
6b6c8110 | 1516 | r1_bio_write_done(r1_bio); |
fd76863e | 1517 | r1_bio = alloc_r1bio(mddev, bio, sectors_handled); |
1f68f0c4 N |
1518 | goto retry_write; |
1519 | } | |
1520 | ||
079fa166 N |
1521 | r1_bio_write_done(r1_bio); |
1522 | ||
1523 | /* In case raid1d snuck in to freeze_array */ | |
1524 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1525 | } |
1526 | ||
3b046a97 RL |
1527 | static void raid1_make_request(struct mddev *mddev, struct bio *bio) |
1528 | { | |
fd76863e | 1529 | struct bio *split; |
1530 | sector_t sectors; | |
3b046a97 | 1531 | |
aff8da09 SL |
1532 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
1533 | md_flush_request(mddev, bio); | |
1534 | return; | |
1535 | } | |
3b046a97 | 1536 | |
fd76863e | 1537 | /* if bio exceeds barrier unit boundary, split it */ |
1538 | do { | |
1539 | sectors = align_to_barrier_unit_end( | |
1540 | bio->bi_iter.bi_sector, bio_sectors(bio)); | |
1541 | if (sectors < bio_sectors(bio)) { | |
1542 | split = bio_split(bio, sectors, GFP_NOIO, fs_bio_set); | |
1543 | bio_chain(split, bio); | |
1544 | } else { | |
1545 | split = bio; | |
1546 | } | |
3b046a97 | 1547 | |
61eb2b43 | 1548 | if (bio_data_dir(split) == READ) { |
fd76863e | 1549 | raid1_read_request(mddev, split); |
61eb2b43 SL |
1550 | |
1551 | /* | |
1552 | * If a bio is splitted, the first part of bio will | |
1553 | * pass barrier but the bio is queued in | |
1554 | * current->bio_list (see generic_make_request). If | |
1555 | * there is a raise_barrier() called here, the second | |
1556 | * part of bio can't pass barrier. But since the first | |
1557 | * part bio isn't dispatched to underlaying disks yet, | |
1558 | * the barrier is never released, hence raise_barrier | |
1559 | * will alays wait. We have a deadlock. | |
1560 | * Note, this only happens in read path. For write | |
1561 | * path, the first part of bio is dispatched in a | |
1562 | * schedule() call (because of blk plug) or offloaded | |
1563 | * to raid10d. | |
1564 | * Quitting from the function immediately can change | |
1565 | * the bio order queued in bio_list and avoid the deadlock. | |
1566 | */ | |
1567 | if (split != bio) { | |
1568 | generic_make_request(bio); | |
1569 | break; | |
1570 | } | |
1571 | } else | |
fd76863e | 1572 | raid1_write_request(mddev, split); |
1573 | } while (split != bio); | |
3b046a97 RL |
1574 | } |
1575 | ||
849674e4 | 1576 | static void raid1_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1577 | { |
e8096360 | 1578 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1579 | int i; |
1580 | ||
1581 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1582 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1583 | rcu_read_lock(); |
1584 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1585 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1586 | seq_printf(seq, "%s", |
ddac7c7e N |
1587 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1588 | } | |
1589 | rcu_read_unlock(); | |
1da177e4 LT |
1590 | seq_printf(seq, "]"); |
1591 | } | |
1592 | ||
849674e4 | 1593 | static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1594 | { |
1595 | char b[BDEVNAME_SIZE]; | |
e8096360 | 1596 | struct r1conf *conf = mddev->private; |
423f04d6 | 1597 | unsigned long flags; |
1da177e4 LT |
1598 | |
1599 | /* | |
1600 | * If it is not operational, then we have already marked it as dead | |
1601 | * else if it is the last working disks, ignore the error, let the | |
1602 | * next level up know. | |
1603 | * else mark the drive as failed | |
1604 | */ | |
2e52d449 | 1605 | spin_lock_irqsave(&conf->device_lock, flags); |
b2d444d7 | 1606 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1607 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1608 | /* |
1609 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1610 | * normal single drive. |
1611 | * However don't try a recovery from this drive as | |
1612 | * it is very likely to fail. | |
1da177e4 | 1613 | */ |
5389042f | 1614 | conf->recovery_disabled = mddev->recovery_disabled; |
2e52d449 | 1615 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 1616 | return; |
4044ba58 | 1617 | } |
de393cde | 1618 | set_bit(Blocked, &rdev->flags); |
c04be0aa | 1619 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1da177e4 | 1620 | mddev->degraded++; |
dd00a99e | 1621 | set_bit(Faulty, &rdev->flags); |
dd00a99e N |
1622 | } else |
1623 | set_bit(Faulty, &rdev->flags); | |
423f04d6 | 1624 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2446dba0 N |
1625 | /* |
1626 | * if recovery is running, make sure it aborts. | |
1627 | */ | |
1628 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2953079c SL |
1629 | set_mask_bits(&mddev->sb_flags, 0, |
1630 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
1d41c216 N |
1631 | pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" |
1632 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
1633 | mdname(mddev), bdevname(rdev->bdev, b), | |
1634 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1635 | } |
1636 | ||
e8096360 | 1637 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1638 | { |
1639 | int i; | |
1da177e4 | 1640 | |
1d41c216 | 1641 | pr_debug("RAID1 conf printout:\n"); |
1da177e4 | 1642 | if (!conf) { |
1d41c216 | 1643 | pr_debug("(!conf)\n"); |
1da177e4 LT |
1644 | return; |
1645 | } | |
1d41c216 N |
1646 | pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1647 | conf->raid_disks); | |
1da177e4 | 1648 | |
ddac7c7e | 1649 | rcu_read_lock(); |
1da177e4 LT |
1650 | for (i = 0; i < conf->raid_disks; i++) { |
1651 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1652 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1653 | if (rdev) |
1d41c216 N |
1654 | pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", |
1655 | i, !test_bit(In_sync, &rdev->flags), | |
1656 | !test_bit(Faulty, &rdev->flags), | |
1657 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1658 | } |
ddac7c7e | 1659 | rcu_read_unlock(); |
1da177e4 LT |
1660 | } |
1661 | ||
e8096360 | 1662 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1663 | { |
fd76863e | 1664 | wait_all_barriers(conf); |
1665 | allow_all_barriers(conf); | |
1da177e4 LT |
1666 | |
1667 | mempool_destroy(conf->r1buf_pool); | |
1668 | conf->r1buf_pool = NULL; | |
1669 | } | |
1670 | ||
fd01b88c | 1671 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1672 | { |
1673 | int i; | |
e8096360 | 1674 | struct r1conf *conf = mddev->private; |
6b965620 N |
1675 | int count = 0; |
1676 | unsigned long flags; | |
1da177e4 LT |
1677 | |
1678 | /* | |
f72ffdd6 | 1679 | * Find all failed disks within the RAID1 configuration |
ddac7c7e N |
1680 | * and mark them readable. |
1681 | * Called under mddev lock, so rcu protection not needed. | |
423f04d6 N |
1682 | * device_lock used to avoid races with raid1_end_read_request |
1683 | * which expects 'In_sync' flags and ->degraded to be consistent. | |
1da177e4 | 1684 | */ |
423f04d6 | 1685 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 1686 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 1687 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1688 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1689 | if (repl | |
1aee41f6 | 1690 | && !test_bit(Candidate, &repl->flags) |
8c7a2c2b N |
1691 | && repl->recovery_offset == MaxSector |
1692 | && !test_bit(Faulty, &repl->flags) | |
1693 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1694 | /* replacement has just become active */ | |
1695 | if (!rdev || | |
1696 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1697 | count++; | |
1698 | if (rdev) { | |
1699 | /* Replaced device not technically | |
1700 | * faulty, but we need to be sure | |
1701 | * it gets removed and never re-added | |
1702 | */ | |
1703 | set_bit(Faulty, &rdev->flags); | |
1704 | sysfs_notify_dirent_safe( | |
1705 | rdev->sysfs_state); | |
1706 | } | |
1707 | } | |
ddac7c7e | 1708 | if (rdev |
61e4947c | 1709 | && rdev->recovery_offset == MaxSector |
ddac7c7e | 1710 | && !test_bit(Faulty, &rdev->flags) |
c04be0aa | 1711 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1712 | count++; |
654e8b5a | 1713 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1714 | } |
1715 | } | |
6b965620 N |
1716 | mddev->degraded -= count; |
1717 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1718 | |
1719 | print_conf(conf); | |
6b965620 | 1720 | return count; |
1da177e4 LT |
1721 | } |
1722 | ||
fd01b88c | 1723 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1724 | { |
e8096360 | 1725 | struct r1conf *conf = mddev->private; |
199050ea | 1726 | int err = -EEXIST; |
41158c7e | 1727 | int mirror = 0; |
0eaf822c | 1728 | struct raid1_info *p; |
6c2fce2e | 1729 | int first = 0; |
30194636 | 1730 | int last = conf->raid_disks - 1; |
1da177e4 | 1731 | |
5389042f N |
1732 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1733 | return -EBUSY; | |
1734 | ||
1501efad DW |
1735 | if (md_integrity_add_rdev(rdev, mddev)) |
1736 | return -ENXIO; | |
1737 | ||
6c2fce2e NB |
1738 | if (rdev->raid_disk >= 0) |
1739 | first = last = rdev->raid_disk; | |
1740 | ||
70bcecdb GR |
1741 | /* |
1742 | * find the disk ... but prefer rdev->saved_raid_disk | |
1743 | * if possible. | |
1744 | */ | |
1745 | if (rdev->saved_raid_disk >= 0 && | |
1746 | rdev->saved_raid_disk >= first && | |
1747 | conf->mirrors[rdev->saved_raid_disk].rdev == NULL) | |
1748 | first = last = rdev->saved_raid_disk; | |
1749 | ||
7ef449d1 N |
1750 | for (mirror = first; mirror <= last; mirror++) { |
1751 | p = conf->mirrors+mirror; | |
1752 | if (!p->rdev) { | |
1da177e4 | 1753 | |
9092c02d JB |
1754 | if (mddev->gendisk) |
1755 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1756 | rdev->data_offset << 9); | |
1da177e4 LT |
1757 | |
1758 | p->head_position = 0; | |
1759 | rdev->raid_disk = mirror; | |
199050ea | 1760 | err = 0; |
6aea114a N |
1761 | /* As all devices are equivalent, we don't need a full recovery |
1762 | * if this was recently any drive of the array | |
1763 | */ | |
1764 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1765 | conf->fullsync = 1; |
d6065f7b | 1766 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1767 | break; |
1768 | } | |
7ef449d1 N |
1769 | if (test_bit(WantReplacement, &p->rdev->flags) && |
1770 | p[conf->raid_disks].rdev == NULL) { | |
1771 | /* Add this device as a replacement */ | |
1772 | clear_bit(In_sync, &rdev->flags); | |
1773 | set_bit(Replacement, &rdev->flags); | |
1774 | rdev->raid_disk = mirror; | |
1775 | err = 0; | |
1776 | conf->fullsync = 1; | |
1777 | rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); | |
1778 | break; | |
1779 | } | |
1780 | } | |
9092c02d | 1781 | if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) |
2ff8cc2c | 1782 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); |
1da177e4 | 1783 | print_conf(conf); |
199050ea | 1784 | return err; |
1da177e4 LT |
1785 | } |
1786 | ||
b8321b68 | 1787 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1788 | { |
e8096360 | 1789 | struct r1conf *conf = mddev->private; |
1da177e4 | 1790 | int err = 0; |
b8321b68 | 1791 | int number = rdev->raid_disk; |
0eaf822c | 1792 | struct raid1_info *p = conf->mirrors + number; |
1da177e4 | 1793 | |
b014f14c N |
1794 | if (rdev != p->rdev) |
1795 | p = conf->mirrors + conf->raid_disks + number; | |
1796 | ||
1da177e4 | 1797 | print_conf(conf); |
b8321b68 | 1798 | if (rdev == p->rdev) { |
b2d444d7 | 1799 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1800 | atomic_read(&rdev->nr_pending)) { |
1801 | err = -EBUSY; | |
1802 | goto abort; | |
1803 | } | |
046abeed | 1804 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1805 | * is not possible. |
1806 | */ | |
1807 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1808 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1809 | mddev->degraded < conf->raid_disks) { |
1810 | err = -EBUSY; | |
1811 | goto abort; | |
1812 | } | |
1da177e4 | 1813 | p->rdev = NULL; |
d787be40 N |
1814 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
1815 | synchronize_rcu(); | |
1816 | if (atomic_read(&rdev->nr_pending)) { | |
1817 | /* lost the race, try later */ | |
1818 | err = -EBUSY; | |
1819 | p->rdev = rdev; | |
1820 | goto abort; | |
1821 | } | |
1822 | } | |
1823 | if (conf->mirrors[conf->raid_disks + number].rdev) { | |
8c7a2c2b N |
1824 | /* We just removed a device that is being replaced. |
1825 | * Move down the replacement. We drain all IO before | |
1826 | * doing this to avoid confusion. | |
1827 | */ | |
1828 | struct md_rdev *repl = | |
1829 | conf->mirrors[conf->raid_disks + number].rdev; | |
e2d59925 | 1830 | freeze_array(conf, 0); |
8c7a2c2b N |
1831 | clear_bit(Replacement, &repl->flags); |
1832 | p->rdev = repl; | |
1833 | conf->mirrors[conf->raid_disks + number].rdev = NULL; | |
e2d59925 | 1834 | unfreeze_array(conf); |
8c7a2c2b N |
1835 | clear_bit(WantReplacement, &rdev->flags); |
1836 | } else | |
b014f14c | 1837 | clear_bit(WantReplacement, &rdev->flags); |
a91a2785 | 1838 | err = md_integrity_register(mddev); |
1da177e4 LT |
1839 | } |
1840 | abort: | |
1841 | ||
1842 | print_conf(conf); | |
1843 | return err; | |
1844 | } | |
1845 | ||
4246a0b6 | 1846 | static void end_sync_read(struct bio *bio) |
1da177e4 | 1847 | { |
9f2c9d12 | 1848 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 1849 | |
0fc280f6 | 1850 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1851 | |
1da177e4 LT |
1852 | /* |
1853 | * we have read a block, now it needs to be re-written, | |
1854 | * or re-read if the read failed. | |
1855 | * We don't do much here, just schedule handling by raid1d | |
1856 | */ | |
4246a0b6 | 1857 | if (!bio->bi_error) |
1da177e4 | 1858 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1859 | |
1860 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1861 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1862 | } |
1863 | ||
4246a0b6 | 1864 | static void end_sync_write(struct bio *bio) |
1da177e4 | 1865 | { |
4246a0b6 | 1866 | int uptodate = !bio->bi_error; |
9f2c9d12 | 1867 | struct r1bio *r1_bio = bio->bi_private; |
fd01b88c | 1868 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1869 | struct r1conf *conf = mddev->private; |
4367af55 N |
1870 | sector_t first_bad; |
1871 | int bad_sectors; | |
854abd75 | 1872 | struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; |
ba3ae3be | 1873 | |
6b1117d5 | 1874 | if (!uptodate) { |
57dab0bd | 1875 | sector_t sync_blocks = 0; |
6b1117d5 N |
1876 | sector_t s = r1_bio->sector; |
1877 | long sectors_to_go = r1_bio->sectors; | |
1878 | /* make sure these bits doesn't get cleared. */ | |
1879 | do { | |
5e3db645 | 1880 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1881 | &sync_blocks, 1); |
1882 | s += sync_blocks; | |
1883 | sectors_to_go -= sync_blocks; | |
1884 | } while (sectors_to_go > 0); | |
854abd75 N |
1885 | set_bit(WriteErrorSeen, &rdev->flags); |
1886 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
1887 | set_bit(MD_RECOVERY_NEEDED, & |
1888 | mddev->recovery); | |
d8f05d29 | 1889 | set_bit(R1BIO_WriteError, &r1_bio->state); |
854abd75 | 1890 | } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
3a9f28a5 N |
1891 | &first_bad, &bad_sectors) && |
1892 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1893 | r1_bio->sector, | |
1894 | r1_bio->sectors, | |
1895 | &first_bad, &bad_sectors) | |
1896 | ) | |
4367af55 | 1897 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1898 | |
1da177e4 | 1899 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1900 | int s = r1_bio->sectors; |
d8f05d29 N |
1901 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1902 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1903 | reschedule_retry(r1_bio); |
1904 | else { | |
1905 | put_buf(r1_bio); | |
1906 | md_done_sync(mddev, s, uptodate); | |
1907 | } | |
1da177e4 | 1908 | } |
1da177e4 LT |
1909 | } |
1910 | ||
3cb03002 | 1911 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1912 | int sectors, struct page *page, int rw) |
1913 | { | |
796a5cf0 | 1914 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) |
d8f05d29 N |
1915 | /* success */ |
1916 | return 1; | |
19d67169 | 1917 | if (rw == WRITE) { |
d8f05d29 | 1918 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1919 | if (!test_and_set_bit(WantReplacement, |
1920 | &rdev->flags)) | |
1921 | set_bit(MD_RECOVERY_NEEDED, & | |
1922 | rdev->mddev->recovery); | |
1923 | } | |
d8f05d29 N |
1924 | /* need to record an error - either for the block or the device */ |
1925 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1926 | md_error(rdev->mddev, rdev); | |
1927 | return 0; | |
1928 | } | |
1929 | ||
9f2c9d12 | 1930 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1931 | { |
a68e5870 N |
1932 | /* Try some synchronous reads of other devices to get |
1933 | * good data, much like with normal read errors. Only | |
1934 | * read into the pages we already have so we don't | |
1935 | * need to re-issue the read request. | |
1936 | * We don't need to freeze the array, because being in an | |
1937 | * active sync request, there is no normal IO, and | |
1938 | * no overlapping syncs. | |
06f60385 N |
1939 | * We don't need to check is_badblock() again as we |
1940 | * made sure that anything with a bad block in range | |
1941 | * will have bi_end_io clear. | |
a68e5870 | 1942 | */ |
fd01b88c | 1943 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1944 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1945 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1946 | sector_t sect = r1_bio->sector; | |
1947 | int sectors = r1_bio->sectors; | |
1948 | int idx = 0; | |
2e52d449 N |
1949 | struct md_rdev *rdev; |
1950 | ||
1951 | rdev = conf->mirrors[r1_bio->read_disk].rdev; | |
1952 | if (test_bit(FailFast, &rdev->flags)) { | |
1953 | /* Don't try recovering from here - just fail it | |
1954 | * ... unless it is the last working device of course */ | |
1955 | md_error(mddev, rdev); | |
1956 | if (test_bit(Faulty, &rdev->flags)) | |
1957 | /* Don't try to read from here, but make sure | |
1958 | * put_buf does it's thing | |
1959 | */ | |
1960 | bio->bi_end_io = end_sync_write; | |
1961 | } | |
a68e5870 N |
1962 | |
1963 | while(sectors) { | |
1964 | int s = sectors; | |
1965 | int d = r1_bio->read_disk; | |
1966 | int success = 0; | |
78d7f5f7 | 1967 | int start; |
a68e5870 N |
1968 | |
1969 | if (s > (PAGE_SIZE>>9)) | |
1970 | s = PAGE_SIZE >> 9; | |
1971 | do { | |
1972 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1973 | /* No rcu protection needed here devices | |
1974 | * can only be removed when no resync is | |
1975 | * active, and resync is currently active | |
1976 | */ | |
1977 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1978 | if (sync_page_io(rdev, sect, s<<9, |
a68e5870 | 1979 | bio->bi_io_vec[idx].bv_page, |
796a5cf0 | 1980 | REQ_OP_READ, 0, false)) { |
a68e5870 N |
1981 | success = 1; |
1982 | break; | |
1983 | } | |
1984 | } | |
1985 | d++; | |
8f19ccb2 | 1986 | if (d == conf->raid_disks * 2) |
a68e5870 N |
1987 | d = 0; |
1988 | } while (!success && d != r1_bio->read_disk); | |
1989 | ||
78d7f5f7 | 1990 | if (!success) { |
a68e5870 | 1991 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1992 | int abort = 0; |
1993 | /* Cannot read from anywhere, this block is lost. | |
1994 | * Record a bad block on each device. If that doesn't | |
1995 | * work just disable and interrupt the recovery. | |
1996 | * Don't fail devices as that won't really help. | |
1997 | */ | |
1d41c216 N |
1998 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
1999 | mdname(mddev), | |
2000 | bdevname(bio->bi_bdev, b), | |
2001 | (unsigned long long)r1_bio->sector); | |
8f19ccb2 | 2002 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
2003 | rdev = conf->mirrors[d].rdev; |
2004 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
2005 | continue; | |
2006 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
2007 | abort = 1; | |
2008 | } | |
2009 | if (abort) { | |
d890fa2b N |
2010 | conf->recovery_disabled = |
2011 | mddev->recovery_disabled; | |
3a9f28a5 N |
2012 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
2013 | md_done_sync(mddev, r1_bio->sectors, 0); | |
2014 | put_buf(r1_bio); | |
2015 | return 0; | |
2016 | } | |
2017 | /* Try next page */ | |
2018 | sectors -= s; | |
2019 | sect += s; | |
2020 | idx++; | |
2021 | continue; | |
d11c171e | 2022 | } |
78d7f5f7 N |
2023 | |
2024 | start = d; | |
2025 | /* write it back and re-read */ | |
2026 | while (d != r1_bio->read_disk) { | |
2027 | if (d == 0) | |
8f19ccb2 | 2028 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2029 | d--; |
2030 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2031 | continue; | |
2032 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
2033 | if (r1_sync_page_io(rdev, sect, s, |
2034 | bio->bi_io_vec[idx].bv_page, | |
2035 | WRITE) == 0) { | |
78d7f5f7 N |
2036 | r1_bio->bios[d]->bi_end_io = NULL; |
2037 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 2038 | } |
78d7f5f7 N |
2039 | } |
2040 | d = start; | |
2041 | while (d != r1_bio->read_disk) { | |
2042 | if (d == 0) | |
8f19ccb2 | 2043 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2044 | d--; |
2045 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2046 | continue; | |
2047 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
2048 | if (r1_sync_page_io(rdev, sect, s, |
2049 | bio->bi_io_vec[idx].bv_page, | |
2050 | READ) != 0) | |
9d3d8011 | 2051 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 2052 | } |
a68e5870 N |
2053 | sectors -= s; |
2054 | sect += s; | |
2055 | idx ++; | |
2056 | } | |
78d7f5f7 | 2057 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
4246a0b6 | 2058 | bio->bi_error = 0; |
a68e5870 N |
2059 | return 1; |
2060 | } | |
2061 | ||
c95e6385 | 2062 | static void process_checks(struct r1bio *r1_bio) |
a68e5870 N |
2063 | { |
2064 | /* We have read all readable devices. If we haven't | |
2065 | * got the block, then there is no hope left. | |
2066 | * If we have, then we want to do a comparison | |
2067 | * and skip the write if everything is the same. | |
2068 | * If any blocks failed to read, then we need to | |
2069 | * attempt an over-write | |
2070 | */ | |
fd01b88c | 2071 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2072 | struct r1conf *conf = mddev->private; |
a68e5870 N |
2073 | int primary; |
2074 | int i; | |
f4380a91 | 2075 | int vcnt; |
a68e5870 | 2076 | |
30bc9b53 N |
2077 | /* Fix variable parts of all bios */ |
2078 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); | |
2079 | for (i = 0; i < conf->raid_disks * 2; i++) { | |
2080 | int j; | |
2081 | int size; | |
4246a0b6 | 2082 | int error; |
30bc9b53 N |
2083 | struct bio *b = r1_bio->bios[i]; |
2084 | if (b->bi_end_io != end_sync_read) | |
2085 | continue; | |
4246a0b6 CH |
2086 | /* fixup the bio for reuse, but preserve errno */ |
2087 | error = b->bi_error; | |
30bc9b53 | 2088 | bio_reset(b); |
4246a0b6 | 2089 | b->bi_error = error; |
30bc9b53 | 2090 | b->bi_vcnt = vcnt; |
4f024f37 KO |
2091 | b->bi_iter.bi_size = r1_bio->sectors << 9; |
2092 | b->bi_iter.bi_sector = r1_bio->sector + | |
30bc9b53 N |
2093 | conf->mirrors[i].rdev->data_offset; |
2094 | b->bi_bdev = conf->mirrors[i].rdev->bdev; | |
2095 | b->bi_end_io = end_sync_read; | |
2096 | b->bi_private = r1_bio; | |
2097 | ||
4f024f37 | 2098 | size = b->bi_iter.bi_size; |
30bc9b53 N |
2099 | for (j = 0; j < vcnt ; j++) { |
2100 | struct bio_vec *bi; | |
2101 | bi = &b->bi_io_vec[j]; | |
2102 | bi->bv_offset = 0; | |
2103 | if (size > PAGE_SIZE) | |
2104 | bi->bv_len = PAGE_SIZE; | |
2105 | else | |
2106 | bi->bv_len = size; | |
2107 | size -= PAGE_SIZE; | |
2108 | } | |
2109 | } | |
8f19ccb2 | 2110 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 | 2111 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
4246a0b6 | 2112 | !r1_bio->bios[primary]->bi_error) { |
a68e5870 N |
2113 | r1_bio->bios[primary]->bi_end_io = NULL; |
2114 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
2115 | break; | |
2116 | } | |
2117 | r1_bio->read_disk = primary; | |
8f19ccb2 | 2118 | for (i = 0; i < conf->raid_disks * 2; i++) { |
78d7f5f7 | 2119 | int j; |
78d7f5f7 N |
2120 | struct bio *pbio = r1_bio->bios[primary]; |
2121 | struct bio *sbio = r1_bio->bios[i]; | |
4246a0b6 | 2122 | int error = sbio->bi_error; |
a68e5870 | 2123 | |
2aabaa65 | 2124 | if (sbio->bi_end_io != end_sync_read) |
78d7f5f7 | 2125 | continue; |
4246a0b6 CH |
2126 | /* Now we can 'fixup' the error value */ |
2127 | sbio->bi_error = 0; | |
78d7f5f7 | 2128 | |
4246a0b6 | 2129 | if (!error) { |
78d7f5f7 N |
2130 | for (j = vcnt; j-- ; ) { |
2131 | struct page *p, *s; | |
2132 | p = pbio->bi_io_vec[j].bv_page; | |
2133 | s = sbio->bi_io_vec[j].bv_page; | |
2134 | if (memcmp(page_address(p), | |
2135 | page_address(s), | |
5020ad7d | 2136 | sbio->bi_io_vec[j].bv_len)) |
78d7f5f7 | 2137 | break; |
69382e85 | 2138 | } |
78d7f5f7 N |
2139 | } else |
2140 | j = 0; | |
2141 | if (j >= 0) | |
7f7583d4 | 2142 | atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
78d7f5f7 | 2143 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
4246a0b6 | 2144 | && !error)) { |
78d7f5f7 N |
2145 | /* No need to write to this device. */ |
2146 | sbio->bi_end_io = NULL; | |
2147 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
2148 | continue; | |
2149 | } | |
d3b45c2a KO |
2150 | |
2151 | bio_copy_data(sbio, pbio); | |
78d7f5f7 | 2152 | } |
a68e5870 N |
2153 | } |
2154 | ||
9f2c9d12 | 2155 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 2156 | { |
e8096360 | 2157 | struct r1conf *conf = mddev->private; |
a68e5870 | 2158 | int i; |
8f19ccb2 | 2159 | int disks = conf->raid_disks * 2; |
a68e5870 N |
2160 | struct bio *bio, *wbio; |
2161 | ||
2162 | bio = r1_bio->bios[r1_bio->read_disk]; | |
2163 | ||
a68e5870 N |
2164 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
2165 | /* ouch - failed to read all of that. */ | |
2166 | if (!fix_sync_read_error(r1_bio)) | |
2167 | return; | |
7ca78d57 N |
2168 | |
2169 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
c95e6385 N |
2170 | process_checks(r1_bio); |
2171 | ||
d11c171e N |
2172 | /* |
2173 | * schedule writes | |
2174 | */ | |
1da177e4 LT |
2175 | atomic_set(&r1_bio->remaining, 1); |
2176 | for (i = 0; i < disks ; i++) { | |
2177 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
2178 | if (wbio->bi_end_io == NULL || |
2179 | (wbio->bi_end_io == end_sync_read && | |
2180 | (i == r1_bio->read_disk || | |
2181 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
2182 | continue; |
2183 | ||
796a5cf0 | 2184 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
212e7eb7 N |
2185 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) |
2186 | wbio->bi_opf |= MD_FAILFAST; | |
2187 | ||
3e198f78 | 2188 | wbio->bi_end_io = end_sync_write; |
1da177e4 | 2189 | atomic_inc(&r1_bio->remaining); |
aa8b57aa | 2190 | md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); |
191ea9b2 | 2191 | |
1da177e4 LT |
2192 | generic_make_request(wbio); |
2193 | } | |
2194 | ||
2195 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 2196 | /* if we're here, all write(s) have completed, so clean up */ |
58e94ae1 N |
2197 | int s = r1_bio->sectors; |
2198 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
2199 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2200 | reschedule_retry(r1_bio); | |
2201 | else { | |
2202 | put_buf(r1_bio); | |
2203 | md_done_sync(mddev, s, 1); | |
2204 | } | |
1da177e4 LT |
2205 | } |
2206 | } | |
2207 | ||
2208 | /* | |
2209 | * This is a kernel thread which: | |
2210 | * | |
2211 | * 1. Retries failed read operations on working mirrors. | |
2212 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 2213 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
2214 | */ |
2215 | ||
e8096360 | 2216 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
2217 | sector_t sect, int sectors) |
2218 | { | |
fd01b88c | 2219 | struct mddev *mddev = conf->mddev; |
867868fb N |
2220 | while(sectors) { |
2221 | int s = sectors; | |
2222 | int d = read_disk; | |
2223 | int success = 0; | |
2224 | int start; | |
3cb03002 | 2225 | struct md_rdev *rdev; |
867868fb N |
2226 | |
2227 | if (s > (PAGE_SIZE>>9)) | |
2228 | s = PAGE_SIZE >> 9; | |
2229 | ||
2230 | do { | |
d2eb35ac N |
2231 | sector_t first_bad; |
2232 | int bad_sectors; | |
2233 | ||
707a6a42 N |
2234 | rcu_read_lock(); |
2235 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2236 | if (rdev && |
da8840a7 | 2237 | (test_bit(In_sync, &rdev->flags) || |
2238 | (!test_bit(Faulty, &rdev->flags) && | |
2239 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac | 2240 | is_badblock(rdev, sect, s, |
707a6a42 N |
2241 | &first_bad, &bad_sectors) == 0) { |
2242 | atomic_inc(&rdev->nr_pending); | |
2243 | rcu_read_unlock(); | |
2244 | if (sync_page_io(rdev, sect, s<<9, | |
796a5cf0 | 2245 | conf->tmppage, REQ_OP_READ, 0, false)) |
707a6a42 N |
2246 | success = 1; |
2247 | rdev_dec_pending(rdev, mddev); | |
2248 | if (success) | |
2249 | break; | |
2250 | } else | |
2251 | rcu_read_unlock(); | |
2252 | d++; | |
2253 | if (d == conf->raid_disks * 2) | |
2254 | d = 0; | |
867868fb N |
2255 | } while (!success && d != read_disk); |
2256 | ||
2257 | if (!success) { | |
d8f05d29 | 2258 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 2259 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
2260 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
2261 | md_error(mddev, rdev); | |
867868fb N |
2262 | break; |
2263 | } | |
2264 | /* write it back and re-read */ | |
2265 | start = d; | |
2266 | while (d != read_disk) { | |
2267 | if (d==0) | |
8f19ccb2 | 2268 | d = conf->raid_disks * 2; |
867868fb | 2269 | d--; |
707a6a42 N |
2270 | rcu_read_lock(); |
2271 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2272 | if (rdev && |
707a6a42 N |
2273 | !test_bit(Faulty, &rdev->flags)) { |
2274 | atomic_inc(&rdev->nr_pending); | |
2275 | rcu_read_unlock(); | |
d8f05d29 N |
2276 | r1_sync_page_io(rdev, sect, s, |
2277 | conf->tmppage, WRITE); | |
707a6a42 N |
2278 | rdev_dec_pending(rdev, mddev); |
2279 | } else | |
2280 | rcu_read_unlock(); | |
867868fb N |
2281 | } |
2282 | d = start; | |
2283 | while (d != read_disk) { | |
2284 | char b[BDEVNAME_SIZE]; | |
2285 | if (d==0) | |
8f19ccb2 | 2286 | d = conf->raid_disks * 2; |
867868fb | 2287 | d--; |
707a6a42 N |
2288 | rcu_read_lock(); |
2289 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2290 | if (rdev && |
b8cb6b4c | 2291 | !test_bit(Faulty, &rdev->flags)) { |
707a6a42 N |
2292 | atomic_inc(&rdev->nr_pending); |
2293 | rcu_read_unlock(); | |
d8f05d29 N |
2294 | if (r1_sync_page_io(rdev, sect, s, |
2295 | conf->tmppage, READ)) { | |
867868fb | 2296 | atomic_add(s, &rdev->corrected_errors); |
1d41c216 N |
2297 | pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", |
2298 | mdname(mddev), s, | |
2299 | (unsigned long long)(sect + | |
2300 | rdev->data_offset), | |
2301 | bdevname(rdev->bdev, b)); | |
867868fb | 2302 | } |
707a6a42 N |
2303 | rdev_dec_pending(rdev, mddev); |
2304 | } else | |
2305 | rcu_read_unlock(); | |
867868fb N |
2306 | } |
2307 | sectors -= s; | |
2308 | sect += s; | |
2309 | } | |
2310 | } | |
2311 | ||
9f2c9d12 | 2312 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 2313 | { |
fd01b88c | 2314 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2315 | struct r1conf *conf = mddev->private; |
3cb03002 | 2316 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
2317 | |
2318 | /* bio has the data to be written to device 'i' where | |
2319 | * we just recently had a write error. | |
2320 | * We repeatedly clone the bio and trim down to one block, | |
2321 | * then try the write. Where the write fails we record | |
2322 | * a bad block. | |
2323 | * It is conceivable that the bio doesn't exactly align with | |
2324 | * blocks. We must handle this somehow. | |
2325 | * | |
2326 | * We currently own a reference on the rdev. | |
2327 | */ | |
2328 | ||
2329 | int block_sectors; | |
2330 | sector_t sector; | |
2331 | int sectors; | |
2332 | int sect_to_write = r1_bio->sectors; | |
2333 | int ok = 1; | |
2334 | ||
2335 | if (rdev->badblocks.shift < 0) | |
2336 | return 0; | |
2337 | ||
ab713cdc ND |
2338 | block_sectors = roundup(1 << rdev->badblocks.shift, |
2339 | bdev_logical_block_size(rdev->bdev) >> 9); | |
cd5ff9a1 N |
2340 | sector = r1_bio->sector; |
2341 | sectors = ((sector + block_sectors) | |
2342 | & ~(sector_t)(block_sectors - 1)) | |
2343 | - sector; | |
2344 | ||
cd5ff9a1 N |
2345 | while (sect_to_write) { |
2346 | struct bio *wbio; | |
2347 | if (sectors > sect_to_write) | |
2348 | sectors = sect_to_write; | |
2349 | /* Write at 'sector' for 'sectors'*/ | |
2350 | ||
b783863f KO |
2351 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
2352 | unsigned vcnt = r1_bio->behind_page_count; | |
2353 | struct bio_vec *vec = r1_bio->behind_bvecs; | |
2354 | ||
2355 | while (!vec->bv_page) { | |
2356 | vec++; | |
2357 | vcnt--; | |
2358 | } | |
2359 | ||
2360 | wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); | |
2361 | memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); | |
2362 | ||
2363 | wbio->bi_vcnt = vcnt; | |
2364 | } else { | |
d7a10308 ML |
2365 | wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, |
2366 | mddev->bio_set); | |
b783863f KO |
2367 | } |
2368 | ||
796a5cf0 | 2369 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
4f024f37 KO |
2370 | wbio->bi_iter.bi_sector = r1_bio->sector; |
2371 | wbio->bi_iter.bi_size = r1_bio->sectors << 9; | |
cd5ff9a1 | 2372 | |
6678d83f | 2373 | bio_trim(wbio, sector - r1_bio->sector, sectors); |
4f024f37 | 2374 | wbio->bi_iter.bi_sector += rdev->data_offset; |
cd5ff9a1 | 2375 | wbio->bi_bdev = rdev->bdev; |
4e49ea4a MC |
2376 | |
2377 | if (submit_bio_wait(wbio) < 0) | |
cd5ff9a1 N |
2378 | /* failure! */ |
2379 | ok = rdev_set_badblocks(rdev, sector, | |
2380 | sectors, 0) | |
2381 | && ok; | |
2382 | ||
2383 | bio_put(wbio); | |
2384 | sect_to_write -= sectors; | |
2385 | sector += sectors; | |
2386 | sectors = block_sectors; | |
2387 | } | |
2388 | return ok; | |
2389 | } | |
2390 | ||
e8096360 | 2391 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2392 | { |
2393 | int m; | |
2394 | int s = r1_bio->sectors; | |
8f19ccb2 | 2395 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2396 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2397 | struct bio *bio = r1_bio->bios[m]; |
2398 | if (bio->bi_end_io == NULL) | |
2399 | continue; | |
4246a0b6 | 2400 | if (!bio->bi_error && |
62096bce | 2401 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { |
c6563a8c | 2402 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce | 2403 | } |
4246a0b6 | 2404 | if (bio->bi_error && |
62096bce N |
2405 | test_bit(R1BIO_WriteError, &r1_bio->state)) { |
2406 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2407 | md_error(conf->mddev, rdev); | |
2408 | } | |
2409 | } | |
2410 | put_buf(r1_bio); | |
2411 | md_done_sync(conf->mddev, s, 1); | |
2412 | } | |
2413 | ||
e8096360 | 2414 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2415 | { |
fd76863e | 2416 | int m, idx; |
55ce74d4 | 2417 | bool fail = false; |
fd76863e | 2418 | |
8f19ccb2 | 2419 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2420 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2421 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2422 | rdev_clear_badblocks(rdev, |
2423 | r1_bio->sector, | |
c6563a8c | 2424 | r1_bio->sectors, 0); |
62096bce N |
2425 | rdev_dec_pending(rdev, conf->mddev); |
2426 | } else if (r1_bio->bios[m] != NULL) { | |
2427 | /* This drive got a write error. We need to | |
2428 | * narrow down and record precise write | |
2429 | * errors. | |
2430 | */ | |
55ce74d4 | 2431 | fail = true; |
62096bce N |
2432 | if (!narrow_write_error(r1_bio, m)) { |
2433 | md_error(conf->mddev, | |
2434 | conf->mirrors[m].rdev); | |
2435 | /* an I/O failed, we can't clear the bitmap */ | |
2436 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2437 | } | |
2438 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2439 | conf->mddev); | |
2440 | } | |
55ce74d4 N |
2441 | if (fail) { |
2442 | spin_lock_irq(&conf->device_lock); | |
2443 | list_add(&r1_bio->retry_list, &conf->bio_end_io_list); | |
fd76863e | 2444 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2445 | atomic_inc(&conf->nr_queued[idx]); |
55ce74d4 | 2446 | spin_unlock_irq(&conf->device_lock); |
824e47da | 2447 | /* |
2448 | * In case freeze_array() is waiting for condition | |
2449 | * get_unqueued_pending() == extra to be true. | |
2450 | */ | |
2451 | wake_up(&conf->wait_barrier); | |
55ce74d4 | 2452 | md_wakeup_thread(conf->mddev->thread); |
bd8688a1 N |
2453 | } else { |
2454 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2455 | close_write(r1_bio); | |
55ce74d4 | 2456 | raid_end_bio_io(r1_bio); |
bd8688a1 | 2457 | } |
62096bce N |
2458 | } |
2459 | ||
e8096360 | 2460 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2461 | { |
2462 | int disk; | |
2463 | int max_sectors; | |
fd01b88c | 2464 | struct mddev *mddev = conf->mddev; |
62096bce N |
2465 | struct bio *bio; |
2466 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 2467 | struct md_rdev *rdev; |
109e3765 N |
2468 | dev_t bio_dev; |
2469 | sector_t bio_sector; | |
62096bce N |
2470 | |
2471 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2472 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2473 | * the block and we can fix it. | |
2474 | * We freeze all other IO, and try reading the block from | |
2475 | * other devices. When we find one, we re-write | |
2476 | * and check it that fixes the read error. | |
2477 | * This is all done synchronously while the array is | |
2478 | * frozen | |
2479 | */ | |
7449f699 TM |
2480 | |
2481 | bio = r1_bio->bios[r1_bio->read_disk]; | |
2482 | bdevname(bio->bi_bdev, b); | |
109e3765 N |
2483 | bio_dev = bio->bi_bdev->bd_dev; |
2484 | bio_sector = conf->mirrors[r1_bio->read_disk].rdev->data_offset + r1_bio->sector; | |
7449f699 TM |
2485 | bio_put(bio); |
2486 | r1_bio->bios[r1_bio->read_disk] = NULL; | |
2487 | ||
2e52d449 N |
2488 | rdev = conf->mirrors[r1_bio->read_disk].rdev; |
2489 | if (mddev->ro == 0 | |
2490 | && !test_bit(FailFast, &rdev->flags)) { | |
e2d59925 | 2491 | freeze_array(conf, 1); |
62096bce N |
2492 | fix_read_error(conf, r1_bio->read_disk, |
2493 | r1_bio->sector, r1_bio->sectors); | |
2494 | unfreeze_array(conf); | |
7449f699 TM |
2495 | } else { |
2496 | r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; | |
2497 | } | |
2498 | ||
2e52d449 | 2499 | rdev_dec_pending(rdev, conf->mddev); |
62096bce | 2500 | |
62096bce N |
2501 | read_more: |
2502 | disk = read_balance(conf, r1_bio, &max_sectors); | |
2503 | if (disk == -1) { | |
1d41c216 N |
2504 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
2505 | mdname(mddev), b, (unsigned long long)r1_bio->sector); | |
62096bce N |
2506 | raid_end_bio_io(r1_bio); |
2507 | } else { | |
2508 | const unsigned long do_sync | |
1eff9d32 | 2509 | = r1_bio->master_bio->bi_opf & REQ_SYNC; |
62096bce | 2510 | r1_bio->read_disk = disk; |
d7a10308 ML |
2511 | bio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, |
2512 | mddev->bio_set); | |
4f024f37 KO |
2513 | bio_trim(bio, r1_bio->sector - bio->bi_iter.bi_sector, |
2514 | max_sectors); | |
62096bce N |
2515 | r1_bio->bios[r1_bio->read_disk] = bio; |
2516 | rdev = conf->mirrors[disk].rdev; | |
1d41c216 N |
2517 | pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", |
2518 | mdname(mddev), | |
2519 | (unsigned long long)r1_bio->sector, | |
2520 | bdevname(rdev->bdev, b)); | |
4f024f37 | 2521 | bio->bi_iter.bi_sector = r1_bio->sector + rdev->data_offset; |
62096bce N |
2522 | bio->bi_bdev = rdev->bdev; |
2523 | bio->bi_end_io = raid1_end_read_request; | |
796a5cf0 | 2524 | bio_set_op_attrs(bio, REQ_OP_READ, do_sync); |
2e52d449 N |
2525 | if (test_bit(FailFast, &rdev->flags) && |
2526 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
2527 | bio->bi_opf |= MD_FAILFAST; | |
62096bce N |
2528 | bio->bi_private = r1_bio; |
2529 | if (max_sectors < r1_bio->sectors) { | |
2530 | /* Drat - have to split this up more */ | |
2531 | struct bio *mbio = r1_bio->master_bio; | |
2532 | int sectors_handled = (r1_bio->sector + max_sectors | |
4f024f37 | 2533 | - mbio->bi_iter.bi_sector); |
62096bce | 2534 | r1_bio->sectors = max_sectors; |
37011e3a | 2535 | bio_inc_remaining(mbio); |
109e3765 N |
2536 | trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), |
2537 | bio, bio_dev, bio_sector); | |
62096bce N |
2538 | generic_make_request(bio); |
2539 | bio = NULL; | |
2540 | ||
fd76863e | 2541 | r1_bio = alloc_r1bio(mddev, mbio, sectors_handled); |
62096bce | 2542 | set_bit(R1BIO_ReadError, &r1_bio->state); |
37011e3a | 2543 | inc_pending(conf, r1_bio->sector); |
62096bce N |
2544 | |
2545 | goto read_more; | |
109e3765 N |
2546 | } else { |
2547 | trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), | |
2548 | bio, bio_dev, bio_sector); | |
62096bce | 2549 | generic_make_request(bio); |
109e3765 | 2550 | } |
62096bce N |
2551 | } |
2552 | } | |
2553 | ||
4ed8731d | 2554 | static void raid1d(struct md_thread *thread) |
1da177e4 | 2555 | { |
4ed8731d | 2556 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2557 | struct r1bio *r1_bio; |
1da177e4 | 2558 | unsigned long flags; |
e8096360 | 2559 | struct r1conf *conf = mddev->private; |
1da177e4 | 2560 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2561 | struct blk_plug plug; |
fd76863e | 2562 | int idx; |
1da177e4 LT |
2563 | |
2564 | md_check_recovery(mddev); | |
e1dfa0a2 | 2565 | |
55ce74d4 | 2566 | if (!list_empty_careful(&conf->bio_end_io_list) && |
2953079c | 2567 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
55ce74d4 N |
2568 | LIST_HEAD(tmp); |
2569 | spin_lock_irqsave(&conf->device_lock, flags); | |
fd76863e | 2570 | if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
2571 | list_splice_init(&conf->bio_end_io_list, &tmp); | |
55ce74d4 N |
2572 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2573 | while (!list_empty(&tmp)) { | |
a452744b MP |
2574 | r1_bio = list_first_entry(&tmp, struct r1bio, |
2575 | retry_list); | |
55ce74d4 | 2576 | list_del(&r1_bio->retry_list); |
fd76863e | 2577 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2578 | atomic_dec(&conf->nr_queued[idx]); |
bd8688a1 N |
2579 | if (mddev->degraded) |
2580 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2581 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2582 | close_write(r1_bio); | |
55ce74d4 N |
2583 | raid_end_bio_io(r1_bio); |
2584 | } | |
2585 | } | |
2586 | ||
e1dfa0a2 | 2587 | blk_start_plug(&plug); |
1da177e4 | 2588 | for (;;) { |
191ea9b2 | 2589 | |
0021b7bc | 2590 | flush_pending_writes(conf); |
191ea9b2 | 2591 | |
a35e63ef N |
2592 | spin_lock_irqsave(&conf->device_lock, flags); |
2593 | if (list_empty(head)) { | |
2594 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2595 | break; |
a35e63ef | 2596 | } |
9f2c9d12 | 2597 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2598 | list_del(head->prev); |
fd76863e | 2599 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2600 | atomic_dec(&conf->nr_queued[idx]); |
1da177e4 LT |
2601 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2602 | ||
2603 | mddev = r1_bio->mddev; | |
070ec55d | 2604 | conf = mddev->private; |
4367af55 | 2605 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2606 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2607 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2608 | handle_sync_write_finished(conf, r1_bio); | |
2609 | else | |
4367af55 | 2610 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2611 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2612 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2613 | handle_write_finished(conf, r1_bio); | |
2614 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2615 | handle_read_error(conf, r1_bio); | |
2616 | else | |
d2eb35ac N |
2617 | /* just a partial read to be scheduled from separate |
2618 | * context | |
2619 | */ | |
2620 | generic_make_request(r1_bio->bios[r1_bio->read_disk]); | |
62096bce | 2621 | |
1d9d5241 | 2622 | cond_resched(); |
2953079c | 2623 | if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) |
de393cde | 2624 | md_check_recovery(mddev); |
1da177e4 | 2625 | } |
e1dfa0a2 | 2626 | blk_finish_plug(&plug); |
1da177e4 LT |
2627 | } |
2628 | ||
e8096360 | 2629 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2630 | { |
2631 | int buffs; | |
2632 | ||
2633 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2634 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2635 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2636 | conf->poolinfo); | |
2637 | if (!conf->r1buf_pool) | |
2638 | return -ENOMEM; | |
1da177e4 LT |
2639 | return 0; |
2640 | } | |
2641 | ||
2642 | /* | |
2643 | * perform a "sync" on one "block" | |
2644 | * | |
2645 | * We need to make sure that no normal I/O request - particularly write | |
2646 | * requests - conflict with active sync requests. | |
2647 | * | |
2648 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2649 | * that can be installed to exclude normal IO requests. | |
2650 | */ | |
2651 | ||
849674e4 SL |
2652 | static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, |
2653 | int *skipped) | |
1da177e4 | 2654 | { |
e8096360 | 2655 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2656 | struct r1bio *r1_bio; |
1da177e4 LT |
2657 | struct bio *bio; |
2658 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2659 | int disk = -1; |
1da177e4 | 2660 | int i; |
3e198f78 N |
2661 | int wonly = -1; |
2662 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2663 | sector_t sync_blocks; |
e3b9703e | 2664 | int still_degraded = 0; |
06f60385 N |
2665 | int good_sectors = RESYNC_SECTORS; |
2666 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
fd76863e | 2667 | int idx = sector_to_idx(sector_nr); |
1da177e4 LT |
2668 | |
2669 | if (!conf->r1buf_pool) | |
2670 | if (init_resync(conf)) | |
57afd89f | 2671 | return 0; |
1da177e4 | 2672 | |
58c0fed4 | 2673 | max_sector = mddev->dev_sectors; |
1da177e4 | 2674 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2675 | /* If we aborted, we need to abort the |
2676 | * sync on the 'current' bitmap chunk (there will | |
2677 | * only be one in raid1 resync. | |
2678 | * We can find the current addess in mddev->curr_resync | |
2679 | */ | |
6a806c51 N |
2680 | if (mddev->curr_resync < max_sector) /* aborted */ |
2681 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2682 | &sync_blocks, 1); |
6a806c51 | 2683 | else /* completed sync */ |
191ea9b2 | 2684 | conf->fullsync = 0; |
6a806c51 N |
2685 | |
2686 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 | 2687 | close_sync(conf); |
c40f341f GR |
2688 | |
2689 | if (mddev_is_clustered(mddev)) { | |
2690 | conf->cluster_sync_low = 0; | |
2691 | conf->cluster_sync_high = 0; | |
c40f341f | 2692 | } |
1da177e4 LT |
2693 | return 0; |
2694 | } | |
2695 | ||
07d84d10 N |
2696 | if (mddev->bitmap == NULL && |
2697 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2698 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2699 | conf->fullsync == 0) { |
2700 | *skipped = 1; | |
2701 | return max_sector - sector_nr; | |
2702 | } | |
6394cca5 N |
2703 | /* before building a request, check if we can skip these blocks.. |
2704 | * This call the bitmap_start_sync doesn't actually record anything | |
2705 | */ | |
e3b9703e | 2706 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2707 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2708 | /* We can skip this block, and probably several more */ |
2709 | *skipped = 1; | |
2710 | return sync_blocks; | |
2711 | } | |
17999be4 | 2712 | |
7ac50447 TM |
2713 | /* |
2714 | * If there is non-resync activity waiting for a turn, then let it | |
2715 | * though before starting on this new sync request. | |
2716 | */ | |
824e47da | 2717 | if (atomic_read(&conf->nr_waiting[idx])) |
7ac50447 TM |
2718 | schedule_timeout_uninterruptible(1); |
2719 | ||
c40f341f GR |
2720 | /* we are incrementing sector_nr below. To be safe, we check against |
2721 | * sector_nr + two times RESYNC_SECTORS | |
2722 | */ | |
2723 | ||
2724 | bitmap_cond_end_sync(mddev->bitmap, sector_nr, | |
2725 | mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); | |
1c4588e9 | 2726 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
17999be4 | 2727 | |
c2fd4c94 | 2728 | raise_barrier(conf, sector_nr); |
1da177e4 | 2729 | |
3e198f78 | 2730 | rcu_read_lock(); |
1da177e4 | 2731 | /* |
3e198f78 N |
2732 | * If we get a correctably read error during resync or recovery, |
2733 | * we might want to read from a different device. So we | |
2734 | * flag all drives that could conceivably be read from for READ, | |
2735 | * and any others (which will be non-In_sync devices) for WRITE. | |
2736 | * If a read fails, we try reading from something else for which READ | |
2737 | * is OK. | |
1da177e4 | 2738 | */ |
1da177e4 | 2739 | |
1da177e4 LT |
2740 | r1_bio->mddev = mddev; |
2741 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2742 | r1_bio->state = 0; |
1da177e4 | 2743 | set_bit(R1BIO_IsSync, &r1_bio->state); |
fd76863e | 2744 | /* make sure good_sectors won't go across barrier unit boundary */ |
2745 | good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); | |
1da177e4 | 2746 | |
8f19ccb2 | 2747 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 2748 | struct md_rdev *rdev; |
1da177e4 | 2749 | bio = r1_bio->bios[i]; |
2aabaa65 | 2750 | bio_reset(bio); |
1da177e4 | 2751 | |
3e198f78 N |
2752 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2753 | if (rdev == NULL || | |
06f60385 | 2754 | test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
2755 | if (i < conf->raid_disks) |
2756 | still_degraded = 1; | |
3e198f78 | 2757 | } else if (!test_bit(In_sync, &rdev->flags)) { |
796a5cf0 | 2758 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
1da177e4 LT |
2759 | bio->bi_end_io = end_sync_write; |
2760 | write_targets ++; | |
3e198f78 N |
2761 | } else { |
2762 | /* may need to read from here */ | |
06f60385 N |
2763 | sector_t first_bad = MaxSector; |
2764 | int bad_sectors; | |
2765 | ||
2766 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2767 | &first_bad, &bad_sectors)) { | |
2768 | if (first_bad > sector_nr) | |
2769 | good_sectors = first_bad - sector_nr; | |
2770 | else { | |
2771 | bad_sectors -= (sector_nr - first_bad); | |
2772 | if (min_bad == 0 || | |
2773 | min_bad > bad_sectors) | |
2774 | min_bad = bad_sectors; | |
2775 | } | |
2776 | } | |
2777 | if (sector_nr < first_bad) { | |
2778 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2779 | if (wonly < 0) | |
2780 | wonly = i; | |
2781 | } else { | |
2782 | if (disk < 0) | |
2783 | disk = i; | |
2784 | } | |
796a5cf0 | 2785 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
06f60385 N |
2786 | bio->bi_end_io = end_sync_read; |
2787 | read_targets++; | |
d57368af AL |
2788 | } else if (!test_bit(WriteErrorSeen, &rdev->flags) && |
2789 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
2790 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { | |
2791 | /* | |
2792 | * The device is suitable for reading (InSync), | |
2793 | * but has bad block(s) here. Let's try to correct them, | |
2794 | * if we are doing resync or repair. Otherwise, leave | |
2795 | * this device alone for this sync request. | |
2796 | */ | |
796a5cf0 | 2797 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
d57368af AL |
2798 | bio->bi_end_io = end_sync_write; |
2799 | write_targets++; | |
3e198f78 | 2800 | } |
3e198f78 | 2801 | } |
06f60385 N |
2802 | if (bio->bi_end_io) { |
2803 | atomic_inc(&rdev->nr_pending); | |
4f024f37 | 2804 | bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; |
06f60385 N |
2805 | bio->bi_bdev = rdev->bdev; |
2806 | bio->bi_private = r1_bio; | |
2e52d449 N |
2807 | if (test_bit(FailFast, &rdev->flags)) |
2808 | bio->bi_opf |= MD_FAILFAST; | |
06f60385 | 2809 | } |
1da177e4 | 2810 | } |
3e198f78 N |
2811 | rcu_read_unlock(); |
2812 | if (disk < 0) | |
2813 | disk = wonly; | |
2814 | r1_bio->read_disk = disk; | |
191ea9b2 | 2815 | |
06f60385 N |
2816 | if (read_targets == 0 && min_bad > 0) { |
2817 | /* These sectors are bad on all InSync devices, so we | |
2818 | * need to mark them bad on all write targets | |
2819 | */ | |
2820 | int ok = 1; | |
8f19ccb2 | 2821 | for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
06f60385 | 2822 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
a42f9d83 | 2823 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
06f60385 N |
2824 | ok = rdev_set_badblocks(rdev, sector_nr, |
2825 | min_bad, 0 | |
2826 | ) && ok; | |
2827 | } | |
2953079c | 2828 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
06f60385 N |
2829 | *skipped = 1; |
2830 | put_buf(r1_bio); | |
2831 | ||
2832 | if (!ok) { | |
2833 | /* Cannot record the badblocks, so need to | |
2834 | * abort the resync. | |
2835 | * If there are multiple read targets, could just | |
2836 | * fail the really bad ones ??? | |
2837 | */ | |
2838 | conf->recovery_disabled = mddev->recovery_disabled; | |
2839 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2840 | return 0; | |
2841 | } else | |
2842 | return min_bad; | |
2843 | ||
2844 | } | |
2845 | if (min_bad > 0 && min_bad < good_sectors) { | |
2846 | /* only resync enough to reach the next bad->good | |
2847 | * transition */ | |
2848 | good_sectors = min_bad; | |
2849 | } | |
2850 | ||
3e198f78 N |
2851 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2852 | /* extra read targets are also write targets */ | |
2853 | write_targets += read_targets-1; | |
2854 | ||
2855 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2856 | /* There is nowhere to write, so all non-sync |
2857 | * drives must be failed - so we are finished | |
2858 | */ | |
b7219ccb N |
2859 | sector_t rv; |
2860 | if (min_bad > 0) | |
2861 | max_sector = sector_nr + min_bad; | |
2862 | rv = max_sector - sector_nr; | |
57afd89f | 2863 | *skipped = 1; |
1da177e4 | 2864 | put_buf(r1_bio); |
1da177e4 LT |
2865 | return rv; |
2866 | } | |
2867 | ||
c6207277 N |
2868 | if (max_sector > mddev->resync_max) |
2869 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2870 | if (max_sector > sector_nr + good_sectors) |
2871 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2872 | nr_sectors = 0; |
289e99e8 | 2873 | sync_blocks = 0; |
1da177e4 LT |
2874 | do { |
2875 | struct page *page; | |
2876 | int len = PAGE_SIZE; | |
2877 | if (sector_nr + (len>>9) > max_sector) | |
2878 | len = (max_sector - sector_nr) << 9; | |
2879 | if (len == 0) | |
2880 | break; | |
6a806c51 N |
2881 | if (sync_blocks == 0) { |
2882 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
2883 | &sync_blocks, still_degraded) && |
2884 | !conf->fullsync && | |
2885 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2886 | break; |
7571ae88 | 2887 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2888 | len = sync_blocks<<9; |
ab7a30c7 | 2889 | } |
191ea9b2 | 2890 | |
8f19ccb2 | 2891 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2892 | bio = r1_bio->bios[i]; |
2893 | if (bio->bi_end_io) { | |
d11c171e | 2894 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
c85ba149 ML |
2895 | |
2896 | /* | |
2897 | * won't fail because the vec table is big | |
2898 | * enough to hold all these pages | |
2899 | */ | |
2900 | bio_add_page(bio, page, len, 0); | |
1da177e4 LT |
2901 | } |
2902 | } | |
2903 | nr_sectors += len>>9; | |
2904 | sector_nr += len>>9; | |
191ea9b2 | 2905 | sync_blocks -= (len>>9); |
1da177e4 | 2906 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
1da177e4 LT |
2907 | r1_bio->sectors = nr_sectors; |
2908 | ||
c40f341f GR |
2909 | if (mddev_is_clustered(mddev) && |
2910 | conf->cluster_sync_high < sector_nr + nr_sectors) { | |
2911 | conf->cluster_sync_low = mddev->curr_resync_completed; | |
2912 | conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; | |
2913 | /* Send resync message */ | |
2914 | md_cluster_ops->resync_info_update(mddev, | |
2915 | conf->cluster_sync_low, | |
2916 | conf->cluster_sync_high); | |
2917 | } | |
2918 | ||
d11c171e N |
2919 | /* For a user-requested sync, we read all readable devices and do a |
2920 | * compare | |
2921 | */ | |
2922 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2923 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2924 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2925 | bio = r1_bio->bios[i]; |
2926 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2927 | read_targets--; |
ddac7c7e | 2928 | md_sync_acct(bio->bi_bdev, nr_sectors); |
2e52d449 N |
2929 | if (read_targets == 1) |
2930 | bio->bi_opf &= ~MD_FAILFAST; | |
d11c171e N |
2931 | generic_make_request(bio); |
2932 | } | |
2933 | } | |
2934 | } else { | |
2935 | atomic_set(&r1_bio->remaining, 1); | |
2936 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 2937 | md_sync_acct(bio->bi_bdev, nr_sectors); |
2e52d449 N |
2938 | if (read_targets == 1) |
2939 | bio->bi_opf &= ~MD_FAILFAST; | |
d11c171e | 2940 | generic_make_request(bio); |
1da177e4 | 2941 | |
d11c171e | 2942 | } |
1da177e4 LT |
2943 | return nr_sectors; |
2944 | } | |
2945 | ||
fd01b88c | 2946 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2947 | { |
2948 | if (sectors) | |
2949 | return sectors; | |
2950 | ||
2951 | return mddev->dev_sectors; | |
2952 | } | |
2953 | ||
e8096360 | 2954 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2955 | { |
e8096360 | 2956 | struct r1conf *conf; |
709ae487 | 2957 | int i; |
0eaf822c | 2958 | struct raid1_info *disk; |
3cb03002 | 2959 | struct md_rdev *rdev; |
709ae487 | 2960 | int err = -ENOMEM; |
1da177e4 | 2961 | |
e8096360 | 2962 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2963 | if (!conf) |
709ae487 | 2964 | goto abort; |
1da177e4 | 2965 | |
fd76863e | 2966 | conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, |
824e47da | 2967 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2968 | if (!conf->nr_pending) |
2969 | goto abort; | |
2970 | ||
2971 | conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2972 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2973 | if (!conf->nr_waiting) |
2974 | goto abort; | |
2975 | ||
2976 | conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2977 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2978 | if (!conf->nr_queued) |
2979 | goto abort; | |
2980 | ||
2981 | conf->barrier = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2982 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2983 | if (!conf->barrier) |
2984 | goto abort; | |
2985 | ||
0eaf822c | 2986 | conf->mirrors = kzalloc(sizeof(struct raid1_info) |
8f19ccb2 | 2987 | * mddev->raid_disks * 2, |
1da177e4 LT |
2988 | GFP_KERNEL); |
2989 | if (!conf->mirrors) | |
709ae487 | 2990 | goto abort; |
1da177e4 | 2991 | |
ddaf22ab N |
2992 | conf->tmppage = alloc_page(GFP_KERNEL); |
2993 | if (!conf->tmppage) | |
709ae487 | 2994 | goto abort; |
ddaf22ab | 2995 | |
709ae487 | 2996 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2997 | if (!conf->poolinfo) |
709ae487 | 2998 | goto abort; |
8f19ccb2 | 2999 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
1da177e4 LT |
3000 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, |
3001 | r1bio_pool_free, | |
3002 | conf->poolinfo); | |
3003 | if (!conf->r1bio_pool) | |
709ae487 N |
3004 | goto abort; |
3005 | ||
ed9bfdf1 | 3006 | conf->poolinfo->mddev = mddev; |
1da177e4 | 3007 | |
c19d5798 | 3008 | err = -EINVAL; |
e7e72bf6 | 3009 | spin_lock_init(&conf->device_lock); |
dafb20fa | 3010 | rdev_for_each(rdev, mddev) { |
aba336bd | 3011 | struct request_queue *q; |
709ae487 | 3012 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
3013 | if (disk_idx >= mddev->raid_disks |
3014 | || disk_idx < 0) | |
3015 | continue; | |
c19d5798 | 3016 | if (test_bit(Replacement, &rdev->flags)) |
02b898f2 | 3017 | disk = conf->mirrors + mddev->raid_disks + disk_idx; |
c19d5798 N |
3018 | else |
3019 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 3020 | |
c19d5798 N |
3021 | if (disk->rdev) |
3022 | goto abort; | |
1da177e4 | 3023 | disk->rdev = rdev; |
aba336bd | 3024 | q = bdev_get_queue(rdev->bdev); |
1da177e4 LT |
3025 | |
3026 | disk->head_position = 0; | |
12cee5a8 | 3027 | disk->seq_start = MaxSector; |
1da177e4 LT |
3028 | } |
3029 | conf->raid_disks = mddev->raid_disks; | |
3030 | conf->mddev = mddev; | |
1da177e4 | 3031 | INIT_LIST_HEAD(&conf->retry_list); |
55ce74d4 | 3032 | INIT_LIST_HEAD(&conf->bio_end_io_list); |
1da177e4 LT |
3033 | |
3034 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 3035 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 3036 | |
191ea9b2 | 3037 | bio_list_init(&conf->pending_bio_list); |
34db0cd6 | 3038 | conf->pending_count = 0; |
d890fa2b | 3039 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 3040 | |
c19d5798 | 3041 | err = -EIO; |
8f19ccb2 | 3042 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
3043 | |
3044 | disk = conf->mirrors + i; | |
3045 | ||
c19d5798 N |
3046 | if (i < conf->raid_disks && |
3047 | disk[conf->raid_disks].rdev) { | |
3048 | /* This slot has a replacement. */ | |
3049 | if (!disk->rdev) { | |
3050 | /* No original, just make the replacement | |
3051 | * a recovering spare | |
3052 | */ | |
3053 | disk->rdev = | |
3054 | disk[conf->raid_disks].rdev; | |
3055 | disk[conf->raid_disks].rdev = NULL; | |
3056 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
3057 | /* Original is not in_sync - bad */ | |
3058 | goto abort; | |
3059 | } | |
3060 | ||
5fd6c1dc N |
3061 | if (!disk->rdev || |
3062 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 3063 | disk->head_position = 0; |
4f0a5e01 JB |
3064 | if (disk->rdev && |
3065 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 3066 | conf->fullsync = 1; |
be4d3280 | 3067 | } |
1da177e4 | 3068 | } |
709ae487 | 3069 | |
709ae487 | 3070 | err = -ENOMEM; |
0232605d | 3071 | conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
1d41c216 | 3072 | if (!conf->thread) |
709ae487 | 3073 | goto abort; |
1da177e4 | 3074 | |
709ae487 N |
3075 | return conf; |
3076 | ||
3077 | abort: | |
3078 | if (conf) { | |
644df1a8 | 3079 | mempool_destroy(conf->r1bio_pool); |
709ae487 N |
3080 | kfree(conf->mirrors); |
3081 | safe_put_page(conf->tmppage); | |
3082 | kfree(conf->poolinfo); | |
fd76863e | 3083 | kfree(conf->nr_pending); |
3084 | kfree(conf->nr_waiting); | |
3085 | kfree(conf->nr_queued); | |
3086 | kfree(conf->barrier); | |
709ae487 N |
3087 | kfree(conf); |
3088 | } | |
3089 | return ERR_PTR(err); | |
3090 | } | |
3091 | ||
afa0f557 | 3092 | static void raid1_free(struct mddev *mddev, void *priv); |
849674e4 | 3093 | static int raid1_run(struct mddev *mddev) |
709ae487 | 3094 | { |
e8096360 | 3095 | struct r1conf *conf; |
709ae487 | 3096 | int i; |
3cb03002 | 3097 | struct md_rdev *rdev; |
5220ea1e | 3098 | int ret; |
2ff8cc2c | 3099 | bool discard_supported = false; |
709ae487 N |
3100 | |
3101 | if (mddev->level != 1) { | |
1d41c216 N |
3102 | pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", |
3103 | mdname(mddev), mddev->level); | |
709ae487 N |
3104 | return -EIO; |
3105 | } | |
3106 | if (mddev->reshape_position != MaxSector) { | |
1d41c216 N |
3107 | pr_warn("md/raid1:%s: reshape_position set but not supported\n", |
3108 | mdname(mddev)); | |
709ae487 N |
3109 | return -EIO; |
3110 | } | |
1da177e4 | 3111 | /* |
709ae487 N |
3112 | * copy the already verified devices into our private RAID1 |
3113 | * bookkeeping area. [whatever we allocate in run(), | |
afa0f557 | 3114 | * should be freed in raid1_free()] |
1da177e4 | 3115 | */ |
709ae487 N |
3116 | if (mddev->private == NULL) |
3117 | conf = setup_conf(mddev); | |
3118 | else | |
3119 | conf = mddev->private; | |
1da177e4 | 3120 | |
709ae487 N |
3121 | if (IS_ERR(conf)) |
3122 | return PTR_ERR(conf); | |
1da177e4 | 3123 | |
c8dc9c65 | 3124 | if (mddev->queue) |
5026d7a9 PA |
3125 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
3126 | ||
dafb20fa | 3127 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
3128 | if (!mddev->gendisk) |
3129 | continue; | |
709ae487 N |
3130 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
3131 | rdev->data_offset << 9); | |
2ff8cc2c SL |
3132 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
3133 | discard_supported = true; | |
1da177e4 | 3134 | } |
191ea9b2 | 3135 | |
709ae487 N |
3136 | mddev->degraded = 0; |
3137 | for (i=0; i < conf->raid_disks; i++) | |
3138 | if (conf->mirrors[i].rdev == NULL || | |
3139 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
3140 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
3141 | mddev->degraded++; | |
3142 | ||
3143 | if (conf->raid_disks - mddev->degraded == 1) | |
3144 | mddev->recovery_cp = MaxSector; | |
3145 | ||
8c6ac868 | 3146 | if (mddev->recovery_cp != MaxSector) |
1d41c216 N |
3147 | pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", |
3148 | mdname(mddev)); | |
3149 | pr_info("md/raid1:%s: active with %d out of %d mirrors\n", | |
f72ffdd6 | 3150 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
1da177e4 | 3151 | mddev->raid_disks); |
709ae487 | 3152 | |
1da177e4 LT |
3153 | /* |
3154 | * Ok, everything is just fine now | |
3155 | */ | |
709ae487 N |
3156 | mddev->thread = conf->thread; |
3157 | conf->thread = NULL; | |
3158 | mddev->private = conf; | |
46533ff7 | 3159 | set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); |
709ae487 | 3160 | |
1f403624 | 3161 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 3162 | |
1ed7242e | 3163 | if (mddev->queue) { |
2ff8cc2c SL |
3164 | if (discard_supported) |
3165 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, | |
3166 | mddev->queue); | |
3167 | else | |
3168 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
3169 | mddev->queue); | |
1ed7242e | 3170 | } |
5220ea1e | 3171 | |
3172 | ret = md_integrity_register(mddev); | |
5aa61f42 N |
3173 | if (ret) { |
3174 | md_unregister_thread(&mddev->thread); | |
afa0f557 | 3175 | raid1_free(mddev, conf); |
5aa61f42 | 3176 | } |
5220ea1e | 3177 | return ret; |
1da177e4 LT |
3178 | } |
3179 | ||
afa0f557 | 3180 | static void raid1_free(struct mddev *mddev, void *priv) |
1da177e4 | 3181 | { |
afa0f557 | 3182 | struct r1conf *conf = priv; |
409c57f3 | 3183 | |
644df1a8 | 3184 | mempool_destroy(conf->r1bio_pool); |
990a8baf | 3185 | kfree(conf->mirrors); |
0fea7ed8 | 3186 | safe_put_page(conf->tmppage); |
990a8baf | 3187 | kfree(conf->poolinfo); |
fd76863e | 3188 | kfree(conf->nr_pending); |
3189 | kfree(conf->nr_waiting); | |
3190 | kfree(conf->nr_queued); | |
3191 | kfree(conf->barrier); | |
1da177e4 | 3192 | kfree(conf); |
1da177e4 LT |
3193 | } |
3194 | ||
fd01b88c | 3195 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
3196 | { |
3197 | /* no resync is happening, and there is enough space | |
3198 | * on all devices, so we can resize. | |
3199 | * We need to make sure resync covers any new space. | |
3200 | * If the array is shrinking we should possibly wait until | |
3201 | * any io in the removed space completes, but it hardly seems | |
3202 | * worth it. | |
3203 | */ | |
a4a6125a N |
3204 | sector_t newsize = raid1_size(mddev, sectors, 0); |
3205 | if (mddev->external_size && | |
3206 | mddev->array_sectors > newsize) | |
b522adcd | 3207 | return -EINVAL; |
a4a6125a N |
3208 | if (mddev->bitmap) { |
3209 | int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); | |
3210 | if (ret) | |
3211 | return ret; | |
3212 | } | |
3213 | md_set_array_sectors(mddev, newsize); | |
b522adcd | 3214 | if (sectors > mddev->dev_sectors && |
b098636c | 3215 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 3216 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
3217 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3218 | } | |
b522adcd | 3219 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 3220 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
3221 | return 0; |
3222 | } | |
3223 | ||
fd01b88c | 3224 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
3225 | { |
3226 | /* We need to: | |
3227 | * 1/ resize the r1bio_pool | |
3228 | * 2/ resize conf->mirrors | |
3229 | * | |
3230 | * We allocate a new r1bio_pool if we can. | |
3231 | * Then raise a device barrier and wait until all IO stops. | |
3232 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
3233 | * |
3234 | * At the same time, we "pack" the devices so that all the missing | |
3235 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
3236 | */ |
3237 | mempool_t *newpool, *oldpool; | |
3238 | struct pool_info *newpoolinfo; | |
0eaf822c | 3239 | struct raid1_info *newmirrors; |
e8096360 | 3240 | struct r1conf *conf = mddev->private; |
63c70c4f | 3241 | int cnt, raid_disks; |
c04be0aa | 3242 | unsigned long flags; |
b5470dc5 | 3243 | int d, d2, err; |
1da177e4 | 3244 | |
63c70c4f | 3245 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 3246 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
3247 | mddev->layout != mddev->new_layout || |
3248 | mddev->level != mddev->new_level) { | |
664e7c41 | 3249 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
3250 | mddev->new_layout = mddev->layout; |
3251 | mddev->new_level = mddev->level; | |
3252 | return -EINVAL; | |
3253 | } | |
3254 | ||
28c1b9fd GR |
3255 | if (!mddev_is_clustered(mddev)) { |
3256 | err = md_allow_write(mddev); | |
3257 | if (err) | |
3258 | return err; | |
3259 | } | |
2a2275d6 | 3260 | |
63c70c4f N |
3261 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
3262 | ||
6ea9c07c N |
3263 | if (raid_disks < conf->raid_disks) { |
3264 | cnt=0; | |
3265 | for (d= 0; d < conf->raid_disks; d++) | |
3266 | if (conf->mirrors[d].rdev) | |
3267 | cnt++; | |
3268 | if (cnt > raid_disks) | |
1da177e4 | 3269 | return -EBUSY; |
6ea9c07c | 3270 | } |
1da177e4 LT |
3271 | |
3272 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
3273 | if (!newpoolinfo) | |
3274 | return -ENOMEM; | |
3275 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 3276 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 LT |
3277 | |
3278 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
3279 | r1bio_pool_free, newpoolinfo); | |
3280 | if (!newpool) { | |
3281 | kfree(newpoolinfo); | |
3282 | return -ENOMEM; | |
3283 | } | |
0eaf822c | 3284 | newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, |
8f19ccb2 | 3285 | GFP_KERNEL); |
1da177e4 LT |
3286 | if (!newmirrors) { |
3287 | kfree(newpoolinfo); | |
3288 | mempool_destroy(newpool); | |
3289 | return -ENOMEM; | |
3290 | } | |
1da177e4 | 3291 | |
e2d59925 | 3292 | freeze_array(conf, 0); |
1da177e4 LT |
3293 | |
3294 | /* ok, everything is stopped */ | |
3295 | oldpool = conf->r1bio_pool; | |
3296 | conf->r1bio_pool = newpool; | |
6ea9c07c | 3297 | |
a88aa786 | 3298 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 3299 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 3300 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 3301 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 3302 | rdev->raid_disk = d2; |
36fad858 NK |
3303 | sysfs_unlink_rdev(mddev, rdev); |
3304 | if (sysfs_link_rdev(mddev, rdev)) | |
1d41c216 N |
3305 | pr_warn("md/raid1:%s: cannot register rd%d\n", |
3306 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 3307 | } |
a88aa786 N |
3308 | if (rdev) |
3309 | newmirrors[d2++].rdev = rdev; | |
3310 | } | |
1da177e4 LT |
3311 | kfree(conf->mirrors); |
3312 | conf->mirrors = newmirrors; | |
3313 | kfree(conf->poolinfo); | |
3314 | conf->poolinfo = newpoolinfo; | |
3315 | ||
c04be0aa | 3316 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 3317 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 3318 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 3319 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 3320 | mddev->delta_disks = 0; |
1da177e4 | 3321 | |
e2d59925 | 3322 | unfreeze_array(conf); |
1da177e4 | 3323 | |
985ca973 | 3324 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
1da177e4 LT |
3325 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3326 | md_wakeup_thread(mddev->thread); | |
3327 | ||
3328 | mempool_destroy(oldpool); | |
3329 | return 0; | |
3330 | } | |
3331 | ||
fd01b88c | 3332 | static void raid1_quiesce(struct mddev *mddev, int state) |
36fa3063 | 3333 | { |
e8096360 | 3334 | struct r1conf *conf = mddev->private; |
36fa3063 N |
3335 | |
3336 | switch(state) { | |
6eef4b21 N |
3337 | case 2: /* wake for suspend */ |
3338 | wake_up(&conf->wait_barrier); | |
3339 | break; | |
9e6603da | 3340 | case 1: |
07169fd4 | 3341 | freeze_array(conf, 0); |
36fa3063 | 3342 | break; |
9e6603da | 3343 | case 0: |
07169fd4 | 3344 | unfreeze_array(conf); |
36fa3063 N |
3345 | break; |
3346 | } | |
36fa3063 N |
3347 | } |
3348 | ||
fd01b88c | 3349 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
3350 | { |
3351 | /* raid1 can take over: | |
3352 | * raid5 with 2 devices, any layout or chunk size | |
3353 | */ | |
3354 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 3355 | struct r1conf *conf; |
709ae487 N |
3356 | mddev->new_level = 1; |
3357 | mddev->new_layout = 0; | |
3358 | mddev->new_chunk_sectors = 0; | |
3359 | conf = setup_conf(mddev); | |
6995f0b2 | 3360 | if (!IS_ERR(conf)) { |
07169fd4 | 3361 | /* Array must appear to be quiesced */ |
3362 | conf->array_frozen = 1; | |
394ed8e4 SL |
3363 | mddev_clear_unsupported_flags(mddev, |
3364 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 3365 | } |
709ae487 N |
3366 | return conf; |
3367 | } | |
3368 | return ERR_PTR(-EINVAL); | |
3369 | } | |
1da177e4 | 3370 | |
84fc4b56 | 3371 | static struct md_personality raid1_personality = |
1da177e4 LT |
3372 | { |
3373 | .name = "raid1", | |
2604b703 | 3374 | .level = 1, |
1da177e4 | 3375 | .owner = THIS_MODULE, |
849674e4 SL |
3376 | .make_request = raid1_make_request, |
3377 | .run = raid1_run, | |
afa0f557 | 3378 | .free = raid1_free, |
849674e4 SL |
3379 | .status = raid1_status, |
3380 | .error_handler = raid1_error, | |
1da177e4 LT |
3381 | .hot_add_disk = raid1_add_disk, |
3382 | .hot_remove_disk= raid1_remove_disk, | |
3383 | .spare_active = raid1_spare_active, | |
849674e4 | 3384 | .sync_request = raid1_sync_request, |
1da177e4 | 3385 | .resize = raid1_resize, |
80c3a6ce | 3386 | .size = raid1_size, |
63c70c4f | 3387 | .check_reshape = raid1_reshape, |
36fa3063 | 3388 | .quiesce = raid1_quiesce, |
709ae487 | 3389 | .takeover = raid1_takeover, |
5c675f83 | 3390 | .congested = raid1_congested, |
1da177e4 LT |
3391 | }; |
3392 | ||
3393 | static int __init raid_init(void) | |
3394 | { | |
2604b703 | 3395 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
3396 | } |
3397 | ||
3398 | static void raid_exit(void) | |
3399 | { | |
2604b703 | 3400 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
3401 | } |
3402 | ||
3403 | module_init(raid_init); | |
3404 | module_exit(raid_exit); | |
3405 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3406 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 3407 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 3408 | MODULE_ALIAS("md-raid1"); |
2604b703 | 3409 | MODULE_ALIAS("md-level-1"); |
34db0cd6 N |
3410 | |
3411 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |