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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 | 40 | |
109e3765 | 41 | #include <trace/events/block.h> |
3f07c014 | 42 | |
43b2e5d8 | 43 | #include "md.h" |
ef740c37 | 44 | #include "raid1.h" |
935fe098 | 45 | #include "md-bitmap.h" |
191ea9b2 | 46 | |
394ed8e4 SL |
47 | #define UNSUPPORTED_MDDEV_FLAGS \ |
48 | ((1L << MD_HAS_JOURNAL) | \ | |
ea0213e0 | 49 | (1L << MD_JOURNAL_CLEAN) | \ |
ddc08823 PB |
50 | (1L << MD_HAS_PPL) | \ |
51 | (1L << MD_HAS_MULTIPLE_PPLS)) | |
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 | ||
fb0eb5df ML |
84 | #include "raid1-10.c" |
85 | ||
98d30c58 ML |
86 | /* |
87 | * for resync bio, r1bio pointer can be retrieved from the per-bio | |
88 | * 'struct resync_pages'. | |
89 | */ | |
90 | static inline struct r1bio *get_resync_r1bio(struct bio *bio) | |
91 | { | |
92 | return get_resync_pages(bio)->raid_bio; | |
93 | } | |
94 | ||
dd0fc66f | 95 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
96 | { |
97 | struct pool_info *pi = data; | |
9f2c9d12 | 98 | int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
1da177e4 LT |
99 | |
100 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 101 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
102 | } |
103 | ||
104 | static void r1bio_pool_free(void *r1_bio, void *data) | |
105 | { | |
106 | kfree(r1_bio); | |
107 | } | |
108 | ||
8e005f7c | 109 | #define RESYNC_DEPTH 32 |
1da177e4 | 110 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) |
8e005f7c | 111 | #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) |
112 | #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) | |
c40f341f GR |
113 | #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) |
114 | #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) | |
1da177e4 | 115 | |
dd0fc66f | 116 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
117 | { |
118 | struct pool_info *pi = data; | |
9f2c9d12 | 119 | struct r1bio *r1_bio; |
1da177e4 | 120 | struct bio *bio; |
da1aab3d | 121 | int need_pages; |
98d30c58 ML |
122 | int j; |
123 | struct resync_pages *rps; | |
1da177e4 LT |
124 | |
125 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 126 | if (!r1_bio) |
1da177e4 | 127 | return NULL; |
1da177e4 | 128 | |
98d30c58 ML |
129 | rps = kmalloc(sizeof(struct resync_pages) * pi->raid_disks, |
130 | gfp_flags); | |
131 | if (!rps) | |
132 | goto out_free_r1bio; | |
133 | ||
1da177e4 LT |
134 | /* |
135 | * Allocate bios : 1 for reading, n-1 for writing | |
136 | */ | |
137 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 138 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
139 | if (!bio) |
140 | goto out_free_bio; | |
141 | r1_bio->bios[j] = bio; | |
142 | } | |
143 | /* | |
144 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
145 | * the first bio. |
146 | * If this is a user-requested check/repair, allocate | |
147 | * RESYNC_PAGES for each bio. | |
1da177e4 | 148 | */ |
d11c171e | 149 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
da1aab3d | 150 | need_pages = pi->raid_disks; |
d11c171e | 151 | else |
da1aab3d | 152 | need_pages = 1; |
98d30c58 ML |
153 | for (j = 0; j < pi->raid_disks; j++) { |
154 | struct resync_pages *rp = &rps[j]; | |
155 | ||
d11c171e | 156 | bio = r1_bio->bios[j]; |
d11c171e | 157 | |
98d30c58 ML |
158 | if (j < need_pages) { |
159 | if (resync_alloc_pages(rp, gfp_flags)) | |
160 | goto out_free_pages; | |
161 | } else { | |
162 | memcpy(rp, &rps[0], sizeof(*rp)); | |
163 | resync_get_all_pages(rp); | |
164 | } | |
165 | ||
98d30c58 ML |
166 | rp->raid_bio = r1_bio; |
167 | bio->bi_private = rp; | |
1da177e4 LT |
168 | } |
169 | ||
170 | r1_bio->master_bio = NULL; | |
171 | ||
172 | return r1_bio; | |
173 | ||
da1aab3d | 174 | out_free_pages: |
491221f8 | 175 | while (--j >= 0) |
98d30c58 | 176 | resync_free_pages(&rps[j]); |
da1aab3d | 177 | |
1da177e4 | 178 | out_free_bio: |
8f19ccb2 | 179 | while (++j < pi->raid_disks) |
1da177e4 | 180 | bio_put(r1_bio->bios[j]); |
98d30c58 ML |
181 | kfree(rps); |
182 | ||
183 | out_free_r1bio: | |
1da177e4 LT |
184 | r1bio_pool_free(r1_bio, data); |
185 | return NULL; | |
186 | } | |
187 | ||
188 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
189 | { | |
190 | struct pool_info *pi = data; | |
98d30c58 | 191 | int i; |
9f2c9d12 | 192 | struct r1bio *r1bio = __r1_bio; |
98d30c58 | 193 | struct resync_pages *rp = NULL; |
1da177e4 | 194 | |
98d30c58 ML |
195 | for (i = pi->raid_disks; i--; ) { |
196 | rp = get_resync_pages(r1bio->bios[i]); | |
197 | resync_free_pages(rp); | |
1da177e4 | 198 | bio_put(r1bio->bios[i]); |
98d30c58 ML |
199 | } |
200 | ||
201 | /* resync pages array stored in the 1st bio's .bi_private */ | |
202 | kfree(rp); | |
1da177e4 LT |
203 | |
204 | r1bio_pool_free(r1bio, data); | |
205 | } | |
206 | ||
e8096360 | 207 | static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
1da177e4 LT |
208 | { |
209 | int i; | |
210 | ||
8f19ccb2 | 211 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 | 212 | struct bio **bio = r1_bio->bios + i; |
4367af55 | 213 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
214 | bio_put(*bio); |
215 | *bio = NULL; | |
216 | } | |
217 | } | |
218 | ||
9f2c9d12 | 219 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 220 | { |
e8096360 | 221 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 222 | |
1da177e4 LT |
223 | put_all_bios(conf, r1_bio); |
224 | mempool_free(r1_bio, conf->r1bio_pool); | |
225 | } | |
226 | ||
9f2c9d12 | 227 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 228 | { |
e8096360 | 229 | struct r1conf *conf = r1_bio->mddev->private; |
af5f42a7 | 230 | sector_t sect = r1_bio->sector; |
3e198f78 N |
231 | int i; |
232 | ||
8f19ccb2 | 233 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3e198f78 N |
234 | struct bio *bio = r1_bio->bios[i]; |
235 | if (bio->bi_end_io) | |
236 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
237 | } | |
1da177e4 LT |
238 | |
239 | mempool_free(r1_bio, conf->r1buf_pool); | |
240 | ||
af5f42a7 | 241 | lower_barrier(conf, sect); |
1da177e4 LT |
242 | } |
243 | ||
9f2c9d12 | 244 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
245 | { |
246 | unsigned long flags; | |
fd01b88c | 247 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 248 | struct r1conf *conf = mddev->private; |
fd76863e | 249 | int idx; |
1da177e4 | 250 | |
fd76863e | 251 | idx = sector_to_idx(r1_bio->sector); |
1da177e4 LT |
252 | spin_lock_irqsave(&conf->device_lock, flags); |
253 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
824e47da | 254 | atomic_inc(&conf->nr_queued[idx]); |
1da177e4 LT |
255 | spin_unlock_irqrestore(&conf->device_lock, flags); |
256 | ||
17999be4 | 257 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
258 | md_wakeup_thread(mddev->thread); |
259 | } | |
260 | ||
261 | /* | |
262 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
263 | * operation and are ready to return a success/failure code to the buffer | |
264 | * cache layer. | |
265 | */ | |
9f2c9d12 | 266 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
267 | { |
268 | struct bio *bio = r1_bio->master_bio; | |
e8096360 | 269 | struct r1conf *conf = r1_bio->mddev->private; |
d2eb35ac N |
270 | |
271 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
4e4cbee9 | 272 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 | 273 | |
37011e3a N |
274 | bio_endio(bio); |
275 | /* | |
276 | * Wake up any possible resync thread that waits for the device | |
277 | * to go idle. | |
278 | */ | |
279 | allow_barrier(conf, r1_bio->sector); | |
d2eb35ac N |
280 | } |
281 | ||
9f2c9d12 | 282 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
283 | { |
284 | struct bio *bio = r1_bio->master_bio; | |
285 | ||
4b6d287f N |
286 | /* if nobody has done the final endio yet, do it now */ |
287 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
288 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
289 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
4f024f37 KO |
290 | (unsigned long long) bio->bi_iter.bi_sector, |
291 | (unsigned long long) bio_end_sector(bio) - 1); | |
4b6d287f | 292 | |
d2eb35ac | 293 | call_bio_endio(r1_bio); |
4b6d287f | 294 | } |
1da177e4 LT |
295 | free_r1bio(r1_bio); |
296 | } | |
297 | ||
298 | /* | |
299 | * Update disk head position estimator based on IRQ completion info. | |
300 | */ | |
9f2c9d12 | 301 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 302 | { |
e8096360 | 303 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
304 | |
305 | conf->mirrors[disk].head_position = | |
306 | r1_bio->sector + (r1_bio->sectors); | |
307 | } | |
308 | ||
ba3ae3be NK |
309 | /* |
310 | * Find the disk number which triggered given bio | |
311 | */ | |
9f2c9d12 | 312 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
313 | { |
314 | int mirror; | |
30194636 N |
315 | struct r1conf *conf = r1_bio->mddev->private; |
316 | int raid_disks = conf->raid_disks; | |
ba3ae3be | 317 | |
8f19ccb2 | 318 | for (mirror = 0; mirror < raid_disks * 2; mirror++) |
ba3ae3be NK |
319 | if (r1_bio->bios[mirror] == bio) |
320 | break; | |
321 | ||
8f19ccb2 | 322 | BUG_ON(mirror == raid_disks * 2); |
ba3ae3be NK |
323 | update_head_pos(mirror, r1_bio); |
324 | ||
325 | return mirror; | |
326 | } | |
327 | ||
4246a0b6 | 328 | static void raid1_end_read_request(struct bio *bio) |
1da177e4 | 329 | { |
4e4cbee9 | 330 | int uptodate = !bio->bi_status; |
9f2c9d12 | 331 | struct r1bio *r1_bio = bio->bi_private; |
e8096360 | 332 | struct r1conf *conf = r1_bio->mddev->private; |
e5872d58 | 333 | struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; |
1da177e4 | 334 | |
1da177e4 LT |
335 | /* |
336 | * this branch is our 'one mirror IO has finished' event handler: | |
337 | */ | |
e5872d58 | 338 | update_head_pos(r1_bio->read_disk, r1_bio); |
ddaf22ab | 339 | |
dd00a99e N |
340 | if (uptodate) |
341 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
2e52d449 N |
342 | else if (test_bit(FailFast, &rdev->flags) && |
343 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
344 | /* This was a fail-fast read so we definitely | |
345 | * want to retry */ | |
346 | ; | |
dd00a99e N |
347 | else { |
348 | /* If all other devices have failed, we want to return | |
349 | * the error upwards rather than fail the last device. | |
350 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 351 | */ |
dd00a99e N |
352 | unsigned long flags; |
353 | spin_lock_irqsave(&conf->device_lock, flags); | |
354 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
355 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
e5872d58 | 356 | test_bit(In_sync, &rdev->flags))) |
dd00a99e N |
357 | uptodate = 1; |
358 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
359 | } | |
1da177e4 | 360 | |
7ad4d4a6 | 361 | if (uptodate) { |
1da177e4 | 362 | raid_end_bio_io(r1_bio); |
e5872d58 | 363 | rdev_dec_pending(rdev, conf->mddev); |
7ad4d4a6 | 364 | } else { |
1da177e4 LT |
365 | /* |
366 | * oops, read error: | |
367 | */ | |
368 | char b[BDEVNAME_SIZE]; | |
1d41c216 N |
369 | pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", |
370 | mdname(conf->mddev), | |
371 | bdevname(rdev->bdev, b), | |
372 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 373 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 | 374 | reschedule_retry(r1_bio); |
7ad4d4a6 | 375 | /* don't drop the reference on read_disk yet */ |
1da177e4 | 376 | } |
1da177e4 LT |
377 | } |
378 | ||
9f2c9d12 | 379 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
380 | { |
381 | /* it really is the end of this request */ | |
382 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
841c1316 ML |
383 | bio_free_pages(r1_bio->behind_master_bio); |
384 | bio_put(r1_bio->behind_master_bio); | |
385 | r1_bio->behind_master_bio = NULL; | |
cd5ff9a1 N |
386 | } |
387 | /* clear the bitmap if all writes complete successfully */ | |
388 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
389 | r1_bio->sectors, | |
390 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
391 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
392 | md_write_end(r1_bio->mddev); | |
393 | } | |
394 | ||
9f2c9d12 | 395 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 396 | { |
cd5ff9a1 N |
397 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
398 | return; | |
399 | ||
400 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
401 | reschedule_retry(r1_bio); | |
402 | else { | |
403 | close_write(r1_bio); | |
4367af55 N |
404 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
405 | reschedule_retry(r1_bio); | |
406 | else | |
407 | raid_end_bio_io(r1_bio); | |
4e78064f N |
408 | } |
409 | } | |
410 | ||
4246a0b6 | 411 | static void raid1_end_write_request(struct bio *bio) |
1da177e4 | 412 | { |
9f2c9d12 | 413 | struct r1bio *r1_bio = bio->bi_private; |
e5872d58 | 414 | int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 415 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 416 | struct bio *to_put = NULL; |
e5872d58 N |
417 | int mirror = find_bio_disk(r1_bio, bio); |
418 | struct md_rdev *rdev = conf->mirrors[mirror].rdev; | |
e3f948cd SL |
419 | bool discard_error; |
420 | ||
4e4cbee9 | 421 | discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; |
1da177e4 | 422 | |
e9c7469b TH |
423 | /* |
424 | * 'one mirror IO has finished' event handler: | |
425 | */ | |
4e4cbee9 | 426 | if (bio->bi_status && !discard_error) { |
e5872d58 N |
427 | set_bit(WriteErrorSeen, &rdev->flags); |
428 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
429 | set_bit(MD_RECOVERY_NEEDED, & |
430 | conf->mddev->recovery); | |
431 | ||
212e7eb7 N |
432 | if (test_bit(FailFast, &rdev->flags) && |
433 | (bio->bi_opf & MD_FAILFAST) && | |
434 | /* We never try FailFast to WriteMostly devices */ | |
435 | !test_bit(WriteMostly, &rdev->flags)) { | |
436 | md_error(r1_bio->mddev, rdev); | |
437 | if (!test_bit(Faulty, &rdev->flags)) | |
438 | /* This is the only remaining device, | |
439 | * We need to retry the write without | |
440 | * FailFast | |
441 | */ | |
442 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
443 | else { | |
444 | /* Finished with this branch */ | |
445 | r1_bio->bios[mirror] = NULL; | |
446 | to_put = bio; | |
447 | } | |
448 | } else | |
449 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 | 450 | } else { |
1da177e4 | 451 | /* |
e9c7469b TH |
452 | * Set R1BIO_Uptodate in our master bio, so that we |
453 | * will return a good error code for to the higher | |
454 | * levels even if IO on some other mirrored buffer | |
455 | * fails. | |
456 | * | |
457 | * The 'master' represents the composite IO operation | |
458 | * to user-side. So if something waits for IO, then it | |
459 | * will wait for the 'master' bio. | |
1da177e4 | 460 | */ |
4367af55 N |
461 | sector_t first_bad; |
462 | int bad_sectors; | |
463 | ||
cd5ff9a1 N |
464 | r1_bio->bios[mirror] = NULL; |
465 | to_put = bio; | |
3056e3ae AL |
466 | /* |
467 | * Do not set R1BIO_Uptodate if the current device is | |
468 | * rebuilding or Faulty. This is because we cannot use | |
469 | * such device for properly reading the data back (we could | |
470 | * potentially use it, if the current write would have felt | |
471 | * before rdev->recovery_offset, but for simplicity we don't | |
472 | * check this here. | |
473 | */ | |
e5872d58 N |
474 | if (test_bit(In_sync, &rdev->flags) && |
475 | !test_bit(Faulty, &rdev->flags)) | |
3056e3ae | 476 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
e9c7469b | 477 | |
4367af55 | 478 | /* Maybe we can clear some bad blocks. */ |
e5872d58 | 479 | if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
e3f948cd | 480 | &first_bad, &bad_sectors) && !discard_error) { |
4367af55 N |
481 | r1_bio->bios[mirror] = IO_MADE_GOOD; |
482 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
483 | } | |
484 | } | |
485 | ||
e9c7469b | 486 | if (behind) { |
e5872d58 | 487 | if (test_bit(WriteMostly, &rdev->flags)) |
e9c7469b TH |
488 | atomic_dec(&r1_bio->behind_remaining); |
489 | ||
490 | /* | |
491 | * In behind mode, we ACK the master bio once the I/O | |
492 | * has safely reached all non-writemostly | |
493 | * disks. Setting the Returned bit ensures that this | |
494 | * gets done only once -- we don't ever want to return | |
495 | * -EIO here, instead we'll wait | |
496 | */ | |
497 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
498 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
499 | /* Maybe we can return now */ | |
500 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
501 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
502 | pr_debug("raid1: behind end write sectors" |
503 | " %llu-%llu\n", | |
4f024f37 KO |
504 | (unsigned long long) mbio->bi_iter.bi_sector, |
505 | (unsigned long long) bio_end_sector(mbio) - 1); | |
d2eb35ac | 506 | call_bio_endio(r1_bio); |
4b6d287f N |
507 | } |
508 | } | |
509 | } | |
4367af55 | 510 | if (r1_bio->bios[mirror] == NULL) |
e5872d58 | 511 | rdev_dec_pending(rdev, conf->mddev); |
e9c7469b | 512 | |
1da177e4 | 513 | /* |
1da177e4 LT |
514 | * Let's see if all mirrored write operations have finished |
515 | * already. | |
516 | */ | |
af6d7b76 | 517 | r1_bio_write_done(r1_bio); |
c70810b3 | 518 | |
04b857f7 N |
519 | if (to_put) |
520 | bio_put(to_put); | |
1da177e4 LT |
521 | } |
522 | ||
fd76863e | 523 | static sector_t align_to_barrier_unit_end(sector_t start_sector, |
524 | sector_t sectors) | |
525 | { | |
526 | sector_t len; | |
527 | ||
528 | WARN_ON(sectors == 0); | |
529 | /* | |
530 | * len is the number of sectors from start_sector to end of the | |
531 | * barrier unit which start_sector belongs to. | |
532 | */ | |
533 | len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - | |
534 | start_sector; | |
535 | ||
536 | if (len > sectors) | |
537 | len = sectors; | |
538 | ||
539 | return len; | |
540 | } | |
541 | ||
1da177e4 LT |
542 | /* |
543 | * This routine returns the disk from which the requested read should | |
544 | * be done. There is a per-array 'next expected sequential IO' sector | |
545 | * number - if this matches on the next IO then we use the last disk. | |
546 | * There is also a per-disk 'last know head position' sector that is | |
547 | * maintained from IRQ contexts, both the normal and the resync IO | |
548 | * completion handlers update this position correctly. If there is no | |
549 | * perfect sequential match then we pick the disk whose head is closest. | |
550 | * | |
551 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
552 | * because position is mirror, not device based. | |
553 | * | |
554 | * The rdev for the device selected will have nr_pending incremented. | |
555 | */ | |
e8096360 | 556 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 557 | { |
af3a2cd6 | 558 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
559 | int sectors; |
560 | int best_good_sectors; | |
9dedf603 SL |
561 | int best_disk, best_dist_disk, best_pending_disk; |
562 | int has_nonrot_disk; | |
be4d3280 | 563 | int disk; |
76073054 | 564 | sector_t best_dist; |
9dedf603 | 565 | unsigned int min_pending; |
3cb03002 | 566 | struct md_rdev *rdev; |
f3ac8bf7 | 567 | int choose_first; |
12cee5a8 | 568 | int choose_next_idle; |
1da177e4 LT |
569 | |
570 | rcu_read_lock(); | |
571 | /* | |
8ddf9efe | 572 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
573 | * device if no resync is going on, or below the resync window. |
574 | * We take the first readable disk when above the resync window. | |
575 | */ | |
576 | retry: | |
d2eb35ac | 577 | sectors = r1_bio->sectors; |
76073054 | 578 | best_disk = -1; |
9dedf603 | 579 | best_dist_disk = -1; |
76073054 | 580 | best_dist = MaxSector; |
9dedf603 SL |
581 | best_pending_disk = -1; |
582 | min_pending = UINT_MAX; | |
d2eb35ac | 583 | best_good_sectors = 0; |
9dedf603 | 584 | has_nonrot_disk = 0; |
12cee5a8 | 585 | choose_next_idle = 0; |
2e52d449 | 586 | clear_bit(R1BIO_FailFast, &r1_bio->state); |
d2eb35ac | 587 | |
7d49ffcf GR |
588 | if ((conf->mddev->recovery_cp < this_sector + sectors) || |
589 | (mddev_is_clustered(conf->mddev) && | |
90382ed9 | 590 | md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, |
7d49ffcf GR |
591 | this_sector + sectors))) |
592 | choose_first = 1; | |
593 | else | |
594 | choose_first = 0; | |
1da177e4 | 595 | |
be4d3280 | 596 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 597 | sector_t dist; |
d2eb35ac N |
598 | sector_t first_bad; |
599 | int bad_sectors; | |
9dedf603 | 600 | unsigned int pending; |
12cee5a8 | 601 | bool nonrot; |
d2eb35ac | 602 | |
f3ac8bf7 N |
603 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
604 | if (r1_bio->bios[disk] == IO_BLOCKED | |
605 | || rdev == NULL | |
76073054 | 606 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 607 | continue; |
76073054 N |
608 | if (!test_bit(In_sync, &rdev->flags) && |
609 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 610 | continue; |
76073054 N |
611 | if (test_bit(WriteMostly, &rdev->flags)) { |
612 | /* Don't balance among write-mostly, just | |
613 | * use the first as a last resort */ | |
d1901ef0 | 614 | if (best_dist_disk < 0) { |
307729c8 N |
615 | if (is_badblock(rdev, this_sector, sectors, |
616 | &first_bad, &bad_sectors)) { | |
816b0acf | 617 | if (first_bad <= this_sector) |
307729c8 N |
618 | /* Cannot use this */ |
619 | continue; | |
620 | best_good_sectors = first_bad - this_sector; | |
621 | } else | |
622 | best_good_sectors = sectors; | |
d1901ef0 TH |
623 | best_dist_disk = disk; |
624 | best_pending_disk = disk; | |
307729c8 | 625 | } |
76073054 N |
626 | continue; |
627 | } | |
628 | /* This is a reasonable device to use. It might | |
629 | * even be best. | |
630 | */ | |
d2eb35ac N |
631 | if (is_badblock(rdev, this_sector, sectors, |
632 | &first_bad, &bad_sectors)) { | |
633 | if (best_dist < MaxSector) | |
634 | /* already have a better device */ | |
635 | continue; | |
636 | if (first_bad <= this_sector) { | |
637 | /* cannot read here. If this is the 'primary' | |
638 | * device, then we must not read beyond | |
639 | * bad_sectors from another device.. | |
640 | */ | |
641 | bad_sectors -= (this_sector - first_bad); | |
642 | if (choose_first && sectors > bad_sectors) | |
643 | sectors = bad_sectors; | |
644 | if (best_good_sectors > sectors) | |
645 | best_good_sectors = sectors; | |
646 | ||
647 | } else { | |
648 | sector_t good_sectors = first_bad - this_sector; | |
649 | if (good_sectors > best_good_sectors) { | |
650 | best_good_sectors = good_sectors; | |
651 | best_disk = disk; | |
652 | } | |
653 | if (choose_first) | |
654 | break; | |
655 | } | |
656 | continue; | |
d82dd0e3 TM |
657 | } else { |
658 | if ((sectors > best_good_sectors) && (best_disk >= 0)) | |
659 | best_disk = -1; | |
d2eb35ac | 660 | best_good_sectors = sectors; |
d82dd0e3 | 661 | } |
d2eb35ac | 662 | |
2e52d449 N |
663 | if (best_disk >= 0) |
664 | /* At least two disks to choose from so failfast is OK */ | |
665 | set_bit(R1BIO_FailFast, &r1_bio->state); | |
666 | ||
12cee5a8 SL |
667 | nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
668 | has_nonrot_disk |= nonrot; | |
9dedf603 | 669 | pending = atomic_read(&rdev->nr_pending); |
76073054 | 670 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
12cee5a8 | 671 | if (choose_first) { |
76073054 | 672 | best_disk = disk; |
1da177e4 LT |
673 | break; |
674 | } | |
12cee5a8 SL |
675 | /* Don't change to another disk for sequential reads */ |
676 | if (conf->mirrors[disk].next_seq_sect == this_sector | |
677 | || dist == 0) { | |
678 | int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; | |
679 | struct raid1_info *mirror = &conf->mirrors[disk]; | |
680 | ||
681 | best_disk = disk; | |
682 | /* | |
683 | * If buffered sequential IO size exceeds optimal | |
684 | * iosize, check if there is idle disk. If yes, choose | |
685 | * the idle disk. read_balance could already choose an | |
686 | * idle disk before noticing it's a sequential IO in | |
687 | * this disk. This doesn't matter because this disk | |
688 | * will idle, next time it will be utilized after the | |
689 | * first disk has IO size exceeds optimal iosize. In | |
690 | * this way, iosize of the first disk will be optimal | |
691 | * iosize at least. iosize of the second disk might be | |
692 | * small, but not a big deal since when the second disk | |
693 | * starts IO, the first disk is likely still busy. | |
694 | */ | |
695 | if (nonrot && opt_iosize > 0 && | |
696 | mirror->seq_start != MaxSector && | |
697 | mirror->next_seq_sect > opt_iosize && | |
698 | mirror->next_seq_sect - opt_iosize >= | |
699 | mirror->seq_start) { | |
700 | choose_next_idle = 1; | |
701 | continue; | |
702 | } | |
703 | break; | |
704 | } | |
12cee5a8 SL |
705 | |
706 | if (choose_next_idle) | |
707 | continue; | |
9dedf603 SL |
708 | |
709 | if (min_pending > pending) { | |
710 | min_pending = pending; | |
711 | best_pending_disk = disk; | |
712 | } | |
713 | ||
76073054 N |
714 | if (dist < best_dist) { |
715 | best_dist = dist; | |
9dedf603 | 716 | best_dist_disk = disk; |
1da177e4 | 717 | } |
f3ac8bf7 | 718 | } |
1da177e4 | 719 | |
9dedf603 SL |
720 | /* |
721 | * If all disks are rotational, choose the closest disk. If any disk is | |
722 | * non-rotational, choose the disk with less pending request even the | |
723 | * disk is rotational, which might/might not be optimal for raids with | |
724 | * mixed ratation/non-rotational disks depending on workload. | |
725 | */ | |
726 | if (best_disk == -1) { | |
2e52d449 | 727 | if (has_nonrot_disk || min_pending == 0) |
9dedf603 SL |
728 | best_disk = best_pending_disk; |
729 | else | |
730 | best_disk = best_dist_disk; | |
731 | } | |
732 | ||
76073054 N |
733 | if (best_disk >= 0) { |
734 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
735 | if (!rdev) |
736 | goto retry; | |
737 | atomic_inc(&rdev->nr_pending); | |
d2eb35ac | 738 | sectors = best_good_sectors; |
12cee5a8 SL |
739 | |
740 | if (conf->mirrors[best_disk].next_seq_sect != this_sector) | |
741 | conf->mirrors[best_disk].seq_start = this_sector; | |
742 | ||
be4d3280 | 743 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 LT |
744 | } |
745 | rcu_read_unlock(); | |
d2eb35ac | 746 | *max_sectors = sectors; |
1da177e4 | 747 | |
76073054 | 748 | return best_disk; |
1da177e4 LT |
749 | } |
750 | ||
5c675f83 | 751 | static int raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 752 | { |
e8096360 | 753 | struct r1conf *conf = mddev->private; |
0d129228 N |
754 | int i, ret = 0; |
755 | ||
4452226e | 756 | if ((bits & (1 << WB_async_congested)) && |
34db0cd6 N |
757 | conf->pending_count >= max_queued_requests) |
758 | return 1; | |
759 | ||
0d129228 | 760 | rcu_read_lock(); |
f53e29fc | 761 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 762 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 763 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 764 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 765 | |
1ed7242e JB |
766 | BUG_ON(!q); |
767 | ||
0d129228 N |
768 | /* Note the '|| 1' - when read_balance prefers |
769 | * non-congested targets, it can be removed | |
770 | */ | |
4452226e | 771 | if ((bits & (1 << WB_async_congested)) || 1) |
dc3b17cc | 772 | ret |= bdi_congested(q->backing_dev_info, bits); |
0d129228 | 773 | else |
dc3b17cc | 774 | ret &= bdi_congested(q->backing_dev_info, bits); |
0d129228 N |
775 | } |
776 | } | |
777 | rcu_read_unlock(); | |
778 | return ret; | |
779 | } | |
0d129228 | 780 | |
673ca68d N |
781 | static void flush_bio_list(struct r1conf *conf, struct bio *bio) |
782 | { | |
783 | /* flush any pending bitmap writes to disk before proceeding w/ I/O */ | |
784 | bitmap_unplug(conf->mddev->bitmap); | |
785 | wake_up(&conf->wait_barrier); | |
786 | ||
787 | while (bio) { /* submit pending writes */ | |
788 | struct bio *next = bio->bi_next; | |
74d46992 | 789 | struct md_rdev *rdev = (void *)bio->bi_disk; |
673ca68d | 790 | bio->bi_next = NULL; |
74d46992 | 791 | bio_set_dev(bio, rdev->bdev); |
673ca68d | 792 | if (test_bit(Faulty, &rdev->flags)) { |
6308d8e3 | 793 | bio_io_error(bio); |
673ca68d | 794 | } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && |
74d46992 | 795 | !blk_queue_discard(bio->bi_disk->queue))) |
673ca68d N |
796 | /* Just ignore it */ |
797 | bio_endio(bio); | |
798 | else | |
799 | generic_make_request(bio); | |
800 | bio = next; | |
801 | } | |
802 | } | |
803 | ||
e8096360 | 804 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
805 | { |
806 | /* Any writes that have been queued but are awaiting | |
807 | * bitmap updates get flushed here. | |
a35e63ef | 808 | */ |
a35e63ef N |
809 | spin_lock_irq(&conf->device_lock); |
810 | ||
811 | if (conf->pending_bio_list.head) { | |
18022a1b | 812 | struct blk_plug plug; |
a35e63ef | 813 | struct bio *bio; |
18022a1b | 814 | |
a35e63ef | 815 | bio = bio_list_get(&conf->pending_bio_list); |
34db0cd6 | 816 | conf->pending_count = 0; |
a35e63ef | 817 | spin_unlock_irq(&conf->device_lock); |
474beb57 N |
818 | |
819 | /* | |
820 | * As this is called in a wait_event() loop (see freeze_array), | |
821 | * current->state might be TASK_UNINTERRUPTIBLE which will | |
822 | * cause a warning when we prepare to wait again. As it is | |
823 | * rare that this path is taken, it is perfectly safe to force | |
824 | * us to go around the wait_event() loop again, so the warning | |
825 | * is a false-positive. Silence the warning by resetting | |
826 | * thread state | |
827 | */ | |
828 | __set_current_state(TASK_RUNNING); | |
18022a1b | 829 | blk_start_plug(&plug); |
673ca68d | 830 | flush_bio_list(conf, bio); |
18022a1b | 831 | blk_finish_plug(&plug); |
a35e63ef N |
832 | } else |
833 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
834 | } |
835 | ||
17999be4 N |
836 | /* Barriers.... |
837 | * Sometimes we need to suspend IO while we do something else, | |
838 | * either some resync/recovery, or reconfigure the array. | |
839 | * To do this we raise a 'barrier'. | |
840 | * The 'barrier' is a counter that can be raised multiple times | |
841 | * to count how many activities are happening which preclude | |
842 | * normal IO. | |
843 | * We can only raise the barrier if there is no pending IO. | |
844 | * i.e. if nr_pending == 0. | |
845 | * We choose only to raise the barrier if no-one is waiting for the | |
846 | * barrier to go down. This means that as soon as an IO request | |
847 | * is ready, no other operations which require a barrier will start | |
848 | * until the IO request has had a chance. | |
849 | * | |
850 | * So: regular IO calls 'wait_barrier'. When that returns there | |
851 | * is no backgroup IO happening, It must arrange to call | |
852 | * allow_barrier when it has finished its IO. | |
853 | * backgroup IO calls must call raise_barrier. Once that returns | |
854 | * there is no normal IO happeing. It must arrange to call | |
855 | * lower_barrier when the particular background IO completes. | |
1da177e4 | 856 | */ |
c2fd4c94 | 857 | static void raise_barrier(struct r1conf *conf, sector_t sector_nr) |
1da177e4 | 858 | { |
fd76863e | 859 | int idx = sector_to_idx(sector_nr); |
860 | ||
1da177e4 | 861 | spin_lock_irq(&conf->resync_lock); |
17999be4 N |
862 | |
863 | /* Wait until no block IO is waiting */ | |
824e47da | 864 | wait_event_lock_irq(conf->wait_barrier, |
865 | !atomic_read(&conf->nr_waiting[idx]), | |
eed8c02e | 866 | conf->resync_lock); |
17999be4 N |
867 | |
868 | /* block any new IO from starting */ | |
824e47da | 869 | atomic_inc(&conf->barrier[idx]); |
870 | /* | |
871 | * In raise_barrier() we firstly increase conf->barrier[idx] then | |
872 | * check conf->nr_pending[idx]. In _wait_barrier() we firstly | |
873 | * increase conf->nr_pending[idx] then check conf->barrier[idx]. | |
874 | * A memory barrier here to make sure conf->nr_pending[idx] won't | |
875 | * be fetched before conf->barrier[idx] is increased. Otherwise | |
876 | * there will be a race between raise_barrier() and _wait_barrier(). | |
877 | */ | |
878 | smp_mb__after_atomic(); | |
17999be4 | 879 | |
79ef3a8a | 880 | /* For these conditions we must wait: |
881 | * A: while the array is in frozen state | |
fd76863e | 882 | * B: while conf->nr_pending[idx] is not 0, meaning regular I/O |
883 | * existing in corresponding I/O barrier bucket. | |
884 | * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches | |
885 | * max resync count which allowed on current I/O barrier bucket. | |
79ef3a8a | 886 | */ |
17999be4 | 887 | wait_event_lock_irq(conf->wait_barrier, |
b364e3d0 | 888 | !conf->array_frozen && |
824e47da | 889 | !atomic_read(&conf->nr_pending[idx]) && |
890 | atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH, | |
eed8c02e | 891 | conf->resync_lock); |
17999be4 | 892 | |
43ac9b84 | 893 | atomic_inc(&conf->nr_sync_pending); |
17999be4 N |
894 | spin_unlock_irq(&conf->resync_lock); |
895 | } | |
896 | ||
fd76863e | 897 | static void lower_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 898 | { |
fd76863e | 899 | int idx = sector_to_idx(sector_nr); |
900 | ||
824e47da | 901 | BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); |
fd76863e | 902 | |
824e47da | 903 | atomic_dec(&conf->barrier[idx]); |
43ac9b84 | 904 | atomic_dec(&conf->nr_sync_pending); |
17999be4 N |
905 | wake_up(&conf->wait_barrier); |
906 | } | |
907 | ||
fd76863e | 908 | static void _wait_barrier(struct r1conf *conf, int idx) |
17999be4 | 909 | { |
824e47da | 910 | /* |
911 | * We need to increase conf->nr_pending[idx] very early here, | |
912 | * then raise_barrier() can be blocked when it waits for | |
913 | * conf->nr_pending[idx] to be 0. Then we can avoid holding | |
914 | * conf->resync_lock when there is no barrier raised in same | |
915 | * barrier unit bucket. Also if the array is frozen, I/O | |
916 | * should be blocked until array is unfrozen. | |
917 | */ | |
918 | atomic_inc(&conf->nr_pending[idx]); | |
919 | /* | |
920 | * In _wait_barrier() we firstly increase conf->nr_pending[idx], then | |
921 | * check conf->barrier[idx]. In raise_barrier() we firstly increase | |
922 | * conf->barrier[idx], then check conf->nr_pending[idx]. A memory | |
923 | * barrier is necessary here to make sure conf->barrier[idx] won't be | |
924 | * fetched before conf->nr_pending[idx] is increased. Otherwise there | |
925 | * will be a race between _wait_barrier() and raise_barrier(). | |
926 | */ | |
927 | smp_mb__after_atomic(); | |
79ef3a8a | 928 | |
824e47da | 929 | /* |
930 | * Don't worry about checking two atomic_t variables at same time | |
931 | * here. If during we check conf->barrier[idx], the array is | |
932 | * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is | |
933 | * 0, it is safe to return and make the I/O continue. Because the | |
934 | * array is frozen, all I/O returned here will eventually complete | |
935 | * or be queued, no race will happen. See code comment in | |
936 | * frozen_array(). | |
937 | */ | |
938 | if (!READ_ONCE(conf->array_frozen) && | |
939 | !atomic_read(&conf->barrier[idx])) | |
940 | return; | |
79ef3a8a | 941 | |
824e47da | 942 | /* |
943 | * After holding conf->resync_lock, conf->nr_pending[idx] | |
944 | * should be decreased before waiting for barrier to drop. | |
945 | * Otherwise, we may encounter a race condition because | |
946 | * raise_barrer() might be waiting for conf->nr_pending[idx] | |
947 | * to be 0 at same time. | |
948 | */ | |
949 | spin_lock_irq(&conf->resync_lock); | |
950 | atomic_inc(&conf->nr_waiting[idx]); | |
951 | atomic_dec(&conf->nr_pending[idx]); | |
952 | /* | |
953 | * In case freeze_array() is waiting for | |
954 | * get_unqueued_pending() == extra | |
955 | */ | |
956 | wake_up(&conf->wait_barrier); | |
957 | /* Wait for the barrier in same barrier unit bucket to drop. */ | |
958 | wait_event_lock_irq(conf->wait_barrier, | |
959 | !conf->array_frozen && | |
960 | !atomic_read(&conf->barrier[idx]), | |
961 | conf->resync_lock); | |
962 | atomic_inc(&conf->nr_pending[idx]); | |
963 | atomic_dec(&conf->nr_waiting[idx]); | |
fd76863e | 964 | spin_unlock_irq(&conf->resync_lock); |
79ef3a8a | 965 | } |
966 | ||
fd76863e | 967 | static void wait_read_barrier(struct r1conf *conf, sector_t sector_nr) |
79ef3a8a | 968 | { |
fd76863e | 969 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 970 | |
824e47da | 971 | /* |
972 | * Very similar to _wait_barrier(). The difference is, for read | |
973 | * I/O we don't need wait for sync I/O, but if the whole array | |
974 | * is frozen, the read I/O still has to wait until the array is | |
975 | * unfrozen. Since there is no ordering requirement with | |
976 | * conf->barrier[idx] here, memory barrier is unnecessary as well. | |
977 | */ | |
978 | atomic_inc(&conf->nr_pending[idx]); | |
79ef3a8a | 979 | |
824e47da | 980 | if (!READ_ONCE(conf->array_frozen)) |
981 | return; | |
982 | ||
983 | spin_lock_irq(&conf->resync_lock); | |
984 | atomic_inc(&conf->nr_waiting[idx]); | |
985 | atomic_dec(&conf->nr_pending[idx]); | |
986 | /* | |
987 | * In case freeze_array() is waiting for | |
988 | * get_unqueued_pending() == extra | |
989 | */ | |
990 | wake_up(&conf->wait_barrier); | |
991 | /* Wait for array to be unfrozen */ | |
992 | wait_event_lock_irq(conf->wait_barrier, | |
993 | !conf->array_frozen, | |
994 | conf->resync_lock); | |
995 | atomic_inc(&conf->nr_pending[idx]); | |
996 | atomic_dec(&conf->nr_waiting[idx]); | |
1da177e4 LT |
997 | spin_unlock_irq(&conf->resync_lock); |
998 | } | |
999 | ||
fd76863e | 1000 | static void wait_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 1001 | { |
fd76863e | 1002 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 1003 | |
fd76863e | 1004 | _wait_barrier(conf, idx); |
1005 | } | |
1006 | ||
fd76863e | 1007 | static void _allow_barrier(struct r1conf *conf, int idx) |
17999be4 | 1008 | { |
824e47da | 1009 | atomic_dec(&conf->nr_pending[idx]); |
17999be4 N |
1010 | wake_up(&conf->wait_barrier); |
1011 | } | |
1012 | ||
fd76863e | 1013 | static void allow_barrier(struct r1conf *conf, sector_t sector_nr) |
1014 | { | |
1015 | int idx = sector_to_idx(sector_nr); | |
1016 | ||
1017 | _allow_barrier(conf, idx); | |
1018 | } | |
1019 | ||
fd76863e | 1020 | /* conf->resync_lock should be held */ |
1021 | static int get_unqueued_pending(struct r1conf *conf) | |
1022 | { | |
1023 | int idx, ret; | |
1024 | ||
43ac9b84 XN |
1025 | ret = atomic_read(&conf->nr_sync_pending); |
1026 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) | |
824e47da | 1027 | ret += atomic_read(&conf->nr_pending[idx]) - |
1028 | atomic_read(&conf->nr_queued[idx]); | |
fd76863e | 1029 | |
1030 | return ret; | |
1031 | } | |
1032 | ||
e2d59925 | 1033 | static void freeze_array(struct r1conf *conf, int extra) |
ddaf22ab | 1034 | { |
fd76863e | 1035 | /* Stop sync I/O and normal I/O and wait for everything to |
11353b9d | 1036 | * go quiet. |
fd76863e | 1037 | * This is called in two situations: |
1038 | * 1) management command handlers (reshape, remove disk, quiesce). | |
1039 | * 2) one normal I/O request failed. | |
1040 | ||
1041 | * After array_frozen is set to 1, new sync IO will be blocked at | |
1042 | * raise_barrier(), and new normal I/O will blocked at _wait_barrier() | |
1043 | * or wait_read_barrier(). The flying I/Os will either complete or be | |
1044 | * queued. When everything goes quite, there are only queued I/Os left. | |
1045 | ||
1046 | * Every flying I/O contributes to a conf->nr_pending[idx], idx is the | |
1047 | * barrier bucket index which this I/O request hits. When all sync and | |
1048 | * normal I/O are queued, sum of all conf->nr_pending[] will match sum | |
1049 | * of all conf->nr_queued[]. But normal I/O failure is an exception, | |
1050 | * in handle_read_error(), we may call freeze_array() before trying to | |
1051 | * fix the read error. In this case, the error read I/O is not queued, | |
1052 | * so get_unqueued_pending() == 1. | |
1053 | * | |
1054 | * Therefore before this function returns, we need to wait until | |
1055 | * get_unqueued_pendings(conf) gets equal to extra. For | |
1056 | * normal I/O context, extra is 1, in rested situations extra is 0. | |
ddaf22ab N |
1057 | */ |
1058 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1059 | conf->array_frozen = 1; |
578b54ad | 1060 | raid1_log(conf->mddev, "wait freeze"); |
fd76863e | 1061 | wait_event_lock_irq_cmd( |
1062 | conf->wait_barrier, | |
1063 | get_unqueued_pending(conf) == extra, | |
1064 | conf->resync_lock, | |
1065 | flush_pending_writes(conf)); | |
ddaf22ab N |
1066 | spin_unlock_irq(&conf->resync_lock); |
1067 | } | |
e8096360 | 1068 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
1069 | { |
1070 | /* reverse the effect of the freeze */ | |
1071 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1072 | conf->array_frozen = 0; |
ddaf22ab | 1073 | spin_unlock_irq(&conf->resync_lock); |
824e47da | 1074 | wake_up(&conf->wait_barrier); |
ddaf22ab N |
1075 | } |
1076 | ||
16d56e2f | 1077 | static void alloc_behind_master_bio(struct r1bio *r1_bio, |
cb83efcf | 1078 | struct bio *bio) |
4b6d287f | 1079 | { |
cb83efcf | 1080 | int size = bio->bi_iter.bi_size; |
841c1316 ML |
1081 | unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1082 | int i = 0; | |
1083 | struct bio *behind_bio = NULL; | |
1084 | ||
1085 | behind_bio = bio_alloc_mddev(GFP_NOIO, vcnt, r1_bio->mddev); | |
1086 | if (!behind_bio) | |
16d56e2f | 1087 | return; |
4b6d287f | 1088 | |
41743c1f | 1089 | /* discard op, we don't support writezero/writesame yet */ |
16d56e2f SL |
1090 | if (!bio_has_data(bio)) { |
1091 | behind_bio->bi_iter.bi_size = size; | |
41743c1f | 1092 | goto skip_copy; |
16d56e2f | 1093 | } |
41743c1f | 1094 | |
841c1316 ML |
1095 | while (i < vcnt && size) { |
1096 | struct page *page; | |
1097 | int len = min_t(int, PAGE_SIZE, size); | |
1098 | ||
1099 | page = alloc_page(GFP_NOIO); | |
1100 | if (unlikely(!page)) | |
1101 | goto free_pages; | |
1102 | ||
1103 | bio_add_page(behind_bio, page, len, 0); | |
1104 | ||
1105 | size -= len; | |
1106 | i++; | |
4b6d287f | 1107 | } |
841c1316 | 1108 | |
cb83efcf | 1109 | bio_copy_data(behind_bio, bio); |
41743c1f | 1110 | skip_copy: |
56a64c17 | 1111 | r1_bio->behind_master_bio = behind_bio; |
af6d7b76 | 1112 | set_bit(R1BIO_BehindIO, &r1_bio->state); |
4b6d287f | 1113 | |
16d56e2f | 1114 | return; |
841c1316 ML |
1115 | |
1116 | free_pages: | |
4f024f37 KO |
1117 | pr_debug("%dB behind alloc failed, doing sync I/O\n", |
1118 | bio->bi_iter.bi_size); | |
841c1316 | 1119 | bio_free_pages(behind_bio); |
16d56e2f | 1120 | bio_put(behind_bio); |
4b6d287f N |
1121 | } |
1122 | ||
f54a9d0e N |
1123 | struct raid1_plug_cb { |
1124 | struct blk_plug_cb cb; | |
1125 | struct bio_list pending; | |
1126 | int pending_cnt; | |
1127 | }; | |
1128 | ||
1129 | static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
1130 | { | |
1131 | struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, | |
1132 | cb); | |
1133 | struct mddev *mddev = plug->cb.data; | |
1134 | struct r1conf *conf = mddev->private; | |
1135 | struct bio *bio; | |
1136 | ||
874807a8 | 1137 | if (from_schedule || current->bio_list) { |
f54a9d0e N |
1138 | spin_lock_irq(&conf->device_lock); |
1139 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
1140 | conf->pending_count += plug->pending_cnt; | |
1141 | spin_unlock_irq(&conf->device_lock); | |
ee0b0244 | 1142 | wake_up(&conf->wait_barrier); |
f54a9d0e N |
1143 | md_wakeup_thread(mddev->thread); |
1144 | kfree(plug); | |
1145 | return; | |
1146 | } | |
1147 | ||
1148 | /* we aren't scheduling, so we can do the write-out directly. */ | |
1149 | bio = bio_list_get(&plug->pending); | |
673ca68d | 1150 | flush_bio_list(conf, bio); |
f54a9d0e N |
1151 | kfree(plug); |
1152 | } | |
1153 | ||
689389a0 N |
1154 | static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) |
1155 | { | |
1156 | r1_bio->master_bio = bio; | |
1157 | r1_bio->sectors = bio_sectors(bio); | |
1158 | r1_bio->state = 0; | |
1159 | r1_bio->mddev = mddev; | |
1160 | r1_bio->sector = bio->bi_iter.bi_sector; | |
1161 | } | |
1162 | ||
fd76863e | 1163 | static inline struct r1bio * |
689389a0 | 1164 | alloc_r1bio(struct mddev *mddev, struct bio *bio) |
fd76863e | 1165 | { |
1166 | struct r1conf *conf = mddev->private; | |
1167 | struct r1bio *r1_bio; | |
1168 | ||
1169 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
689389a0 N |
1170 | /* Ensure no bio records IO_BLOCKED */ |
1171 | memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); | |
1172 | init_r1bio(r1_bio, mddev, bio); | |
fd76863e | 1173 | return r1_bio; |
1174 | } | |
1175 | ||
c230e7e5 | 1176 | static void raid1_read_request(struct mddev *mddev, struct bio *bio, |
689389a0 | 1177 | int max_read_sectors, struct r1bio *r1_bio) |
1da177e4 | 1178 | { |
e8096360 | 1179 | struct r1conf *conf = mddev->private; |
0eaf822c | 1180 | struct raid1_info *mirror; |
1da177e4 | 1181 | struct bio *read_bio; |
3b046a97 RL |
1182 | struct bitmap *bitmap = mddev->bitmap; |
1183 | const int op = bio_op(bio); | |
1184 | const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); | |
3b046a97 RL |
1185 | int max_sectors; |
1186 | int rdisk; | |
689389a0 N |
1187 | bool print_msg = !!r1_bio; |
1188 | char b[BDEVNAME_SIZE]; | |
3b046a97 | 1189 | |
fd76863e | 1190 | /* |
689389a0 N |
1191 | * If r1_bio is set, we are blocking the raid1d thread |
1192 | * so there is a tiny risk of deadlock. So ask for | |
1193 | * emergency memory if needed. | |
fd76863e | 1194 | */ |
689389a0 | 1195 | gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; |
fd76863e | 1196 | |
689389a0 N |
1197 | if (print_msg) { |
1198 | /* Need to get the block device name carefully */ | |
1199 | struct md_rdev *rdev; | |
1200 | rcu_read_lock(); | |
1201 | rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev); | |
1202 | if (rdev) | |
1203 | bdevname(rdev->bdev, b); | |
1204 | else | |
1205 | strcpy(b, "???"); | |
1206 | rcu_read_unlock(); | |
1207 | } | |
3b046a97 | 1208 | |
fd76863e | 1209 | /* |
fd76863e | 1210 | * Still need barrier for READ in case that whole |
1211 | * array is frozen. | |
fd76863e | 1212 | */ |
fd76863e | 1213 | wait_read_barrier(conf, bio->bi_iter.bi_sector); |
1214 | ||
689389a0 N |
1215 | if (!r1_bio) |
1216 | r1_bio = alloc_r1bio(mddev, bio); | |
1217 | else | |
1218 | init_r1bio(r1_bio, mddev, bio); | |
c230e7e5 | 1219 | r1_bio->sectors = max_read_sectors; |
fd76863e | 1220 | |
1221 | /* | |
1222 | * make_request() can abort the operation when read-ahead is being | |
1223 | * used and no empty request is available. | |
1224 | */ | |
3b046a97 RL |
1225 | rdisk = read_balance(conf, r1_bio, &max_sectors); |
1226 | ||
1227 | if (rdisk < 0) { | |
1228 | /* couldn't find anywhere to read from */ | |
689389a0 N |
1229 | if (print_msg) { |
1230 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", | |
1231 | mdname(mddev), | |
1232 | b, | |
1233 | (unsigned long long)r1_bio->sector); | |
1234 | } | |
3b046a97 RL |
1235 | raid_end_bio_io(r1_bio); |
1236 | return; | |
1237 | } | |
1238 | mirror = conf->mirrors + rdisk; | |
1239 | ||
689389a0 N |
1240 | if (print_msg) |
1241 | pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", | |
1242 | mdname(mddev), | |
1243 | (unsigned long long)r1_bio->sector, | |
1244 | bdevname(mirror->rdev->bdev, b)); | |
1245 | ||
3b046a97 RL |
1246 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
1247 | bitmap) { | |
1248 | /* | |
1249 | * Reading from a write-mostly device must take care not to | |
1250 | * over-take any writes that are 'behind' | |
1251 | */ | |
1252 | raid1_log(mddev, "wait behind writes"); | |
1253 | wait_event(bitmap->behind_wait, | |
1254 | atomic_read(&bitmap->behind_writes) == 0); | |
1255 | } | |
c230e7e5 N |
1256 | |
1257 | if (max_sectors < bio_sectors(bio)) { | |
1258 | struct bio *split = bio_split(bio, max_sectors, | |
689389a0 | 1259 | gfp, conf->bio_split); |
c230e7e5 N |
1260 | bio_chain(split, bio); |
1261 | generic_make_request(bio); | |
1262 | bio = split; | |
1263 | r1_bio->master_bio = bio; | |
1264 | r1_bio->sectors = max_sectors; | |
1265 | } | |
1266 | ||
3b046a97 | 1267 | r1_bio->read_disk = rdisk; |
3b046a97 | 1268 | |
689389a0 | 1269 | read_bio = bio_clone_fast(bio, gfp, mddev->bio_set); |
3b046a97 RL |
1270 | |
1271 | r1_bio->bios[rdisk] = read_bio; | |
1272 | ||
1273 | read_bio->bi_iter.bi_sector = r1_bio->sector + | |
1274 | mirror->rdev->data_offset; | |
74d46992 | 1275 | bio_set_dev(read_bio, mirror->rdev->bdev); |
3b046a97 RL |
1276 | read_bio->bi_end_io = raid1_end_read_request; |
1277 | bio_set_op_attrs(read_bio, op, do_sync); | |
1278 | if (test_bit(FailFast, &mirror->rdev->flags) && | |
1279 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
1280 | read_bio->bi_opf |= MD_FAILFAST; | |
1281 | read_bio->bi_private = r1_bio; | |
1282 | ||
1283 | if (mddev->gendisk) | |
74d46992 CH |
1284 | trace_block_bio_remap(read_bio->bi_disk->queue, read_bio, |
1285 | disk_devt(mddev->gendisk), r1_bio->sector); | |
3b046a97 | 1286 | |
c230e7e5 | 1287 | generic_make_request(read_bio); |
3b046a97 RL |
1288 | } |
1289 | ||
c230e7e5 N |
1290 | static void raid1_write_request(struct mddev *mddev, struct bio *bio, |
1291 | int max_write_sectors) | |
3b046a97 RL |
1292 | { |
1293 | struct r1conf *conf = mddev->private; | |
fd76863e | 1294 | struct r1bio *r1_bio; |
1f68f0c4 | 1295 | int i, disks; |
3b046a97 | 1296 | struct bitmap *bitmap = mddev->bitmap; |
191ea9b2 | 1297 | unsigned long flags; |
3cb03002 | 1298 | struct md_rdev *blocked_rdev; |
f54a9d0e N |
1299 | struct blk_plug_cb *cb; |
1300 | struct raid1_plug_cb *plug = NULL; | |
1f68f0c4 | 1301 | int first_clone; |
1f68f0c4 | 1302 | int max_sectors; |
191ea9b2 | 1303 | |
b3143b9a | 1304 | if (mddev_is_clustered(mddev) && |
90382ed9 | 1305 | md_cluster_ops->area_resyncing(mddev, WRITE, |
b3143b9a | 1306 | bio->bi_iter.bi_sector, bio_end_sector(bio))) { |
3b046a97 | 1307 | |
6eef4b21 N |
1308 | DEFINE_WAIT(w); |
1309 | for (;;) { | |
6eef4b21 | 1310 | prepare_to_wait(&conf->wait_barrier, |
ae89fd3d | 1311 | &w, TASK_IDLE); |
f81f7302 | 1312 | if (!md_cluster_ops->area_resyncing(mddev, WRITE, |
385f4d7f | 1313 | bio->bi_iter.bi_sector, |
b3143b9a | 1314 | bio_end_sector(bio))) |
6eef4b21 N |
1315 | break; |
1316 | schedule(); | |
1317 | } | |
1318 | finish_wait(&conf->wait_barrier, &w); | |
1319 | } | |
f81f7302 GJ |
1320 | |
1321 | /* | |
1322 | * Register the new request and wait if the reconstruction | |
1323 | * thread has put up a bar for new requests. | |
1324 | * Continue immediately if no resync is active currently. | |
1325 | */ | |
fd76863e | 1326 | wait_barrier(conf, bio->bi_iter.bi_sector); |
1327 | ||
689389a0 | 1328 | r1_bio = alloc_r1bio(mddev, bio); |
c230e7e5 | 1329 | r1_bio->sectors = max_write_sectors; |
1da177e4 | 1330 | |
34db0cd6 N |
1331 | if (conf->pending_count >= max_queued_requests) { |
1332 | md_wakeup_thread(mddev->thread); | |
578b54ad | 1333 | raid1_log(mddev, "wait queued"); |
34db0cd6 N |
1334 | wait_event(conf->wait_barrier, |
1335 | conf->pending_count < max_queued_requests); | |
1336 | } | |
1f68f0c4 | 1337 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1338 | * inc refcount on their rdev. Record them by setting |
1339 | * bios[x] to bio | |
1f68f0c4 N |
1340 | * If there are known/acknowledged bad blocks on any device on |
1341 | * which we have seen a write error, we want to avoid writing those | |
1342 | * blocks. | |
1343 | * This potentially requires several writes to write around | |
1344 | * the bad blocks. Each set of writes gets it's own r1bio | |
1345 | * with a set of bios attached. | |
1da177e4 | 1346 | */ |
c3b328ac | 1347 | |
8f19ccb2 | 1348 | disks = conf->raid_disks * 2; |
6bfe0b49 DW |
1349 | retry_write: |
1350 | blocked_rdev = NULL; | |
1da177e4 | 1351 | rcu_read_lock(); |
1f68f0c4 | 1352 | max_sectors = r1_bio->sectors; |
1da177e4 | 1353 | for (i = 0; i < disks; i++) { |
3cb03002 | 1354 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
1355 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1356 | atomic_inc(&rdev->nr_pending); | |
1357 | blocked_rdev = rdev; | |
1358 | break; | |
1359 | } | |
1f68f0c4 | 1360 | r1_bio->bios[i] = NULL; |
8ae12666 | 1361 | if (!rdev || test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
1362 | if (i < conf->raid_disks) |
1363 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1364 | continue; |
1365 | } | |
1366 | ||
1367 | atomic_inc(&rdev->nr_pending); | |
1368 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1369 | sector_t first_bad; | |
1370 | int bad_sectors; | |
1371 | int is_bad; | |
1372 | ||
3b046a97 | 1373 | is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, |
1f68f0c4 N |
1374 | &first_bad, &bad_sectors); |
1375 | if (is_bad < 0) { | |
1376 | /* mustn't write here until the bad block is | |
1377 | * acknowledged*/ | |
1378 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1379 | blocked_rdev = rdev; | |
1380 | break; | |
1381 | } | |
1382 | if (is_bad && first_bad <= r1_bio->sector) { | |
1383 | /* Cannot write here at all */ | |
1384 | bad_sectors -= (r1_bio->sector - first_bad); | |
1385 | if (bad_sectors < max_sectors) | |
1386 | /* mustn't write more than bad_sectors | |
1387 | * to other devices yet | |
1388 | */ | |
1389 | max_sectors = bad_sectors; | |
03c902e1 | 1390 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1391 | /* We don't set R1BIO_Degraded as that |
1392 | * only applies if the disk is | |
1393 | * missing, so it might be re-added, | |
1394 | * and we want to know to recover this | |
1395 | * chunk. | |
1396 | * In this case the device is here, | |
1397 | * and the fact that this chunk is not | |
1398 | * in-sync is recorded in the bad | |
1399 | * block log | |
1400 | */ | |
1401 | continue; | |
964147d5 | 1402 | } |
1f68f0c4 N |
1403 | if (is_bad) { |
1404 | int good_sectors = first_bad - r1_bio->sector; | |
1405 | if (good_sectors < max_sectors) | |
1406 | max_sectors = good_sectors; | |
1407 | } | |
1408 | } | |
1409 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1410 | } |
1411 | rcu_read_unlock(); | |
1412 | ||
6bfe0b49 DW |
1413 | if (unlikely(blocked_rdev)) { |
1414 | /* Wait for this device to become unblocked */ | |
1415 | int j; | |
1416 | ||
1417 | for (j = 0; j < i; j++) | |
1418 | if (r1_bio->bios[j]) | |
1419 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1420 | r1_bio->state = 0; |
fd76863e | 1421 | allow_barrier(conf, bio->bi_iter.bi_sector); |
578b54ad | 1422 | raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); |
6bfe0b49 | 1423 | md_wait_for_blocked_rdev(blocked_rdev, mddev); |
fd76863e | 1424 | wait_barrier(conf, bio->bi_iter.bi_sector); |
6bfe0b49 DW |
1425 | goto retry_write; |
1426 | } | |
1427 | ||
c230e7e5 N |
1428 | if (max_sectors < bio_sectors(bio)) { |
1429 | struct bio *split = bio_split(bio, max_sectors, | |
1430 | GFP_NOIO, conf->bio_split); | |
1431 | bio_chain(split, bio); | |
1432 | generic_make_request(bio); | |
1433 | bio = split; | |
1434 | r1_bio->master_bio = bio; | |
1f68f0c4 | 1435 | r1_bio->sectors = max_sectors; |
191ea9b2 | 1436 | } |
4b6d287f | 1437 | |
4e78064f | 1438 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1439 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1440 | |
1f68f0c4 | 1441 | first_clone = 1; |
d8c84c4f | 1442 | |
1da177e4 | 1443 | for (i = 0; i < disks; i++) { |
8e58e327 | 1444 | struct bio *mbio = NULL; |
1da177e4 LT |
1445 | if (!r1_bio->bios[i]) |
1446 | continue; | |
1447 | ||
1f68f0c4 N |
1448 | |
1449 | if (first_clone) { | |
1450 | /* do behind I/O ? | |
1451 | * Not if there are too many, or cannot | |
1452 | * allocate memory, or a reader on WriteMostly | |
1453 | * is waiting for behind writes to flush */ | |
1454 | if (bitmap && | |
1455 | (atomic_read(&bitmap->behind_writes) | |
1456 | < mddev->bitmap_info.max_write_behind) && | |
8e58e327 | 1457 | !waitqueue_active(&bitmap->behind_wait)) { |
16d56e2f | 1458 | alloc_behind_master_bio(r1_bio, bio); |
8e58e327 | 1459 | } |
1f68f0c4 N |
1460 | |
1461 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1462 | r1_bio->sectors, | |
1463 | test_bit(R1BIO_BehindIO, | |
1464 | &r1_bio->state)); | |
1465 | first_clone = 0; | |
1466 | } | |
8e58e327 | 1467 | |
16d56e2f SL |
1468 | if (r1_bio->behind_master_bio) |
1469 | mbio = bio_clone_fast(r1_bio->behind_master_bio, | |
1470 | GFP_NOIO, mddev->bio_set); | |
1471 | else | |
1472 | mbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set); | |
8e58e327 | 1473 | |
841c1316 | 1474 | if (r1_bio->behind_master_bio) { |
4b6d287f N |
1475 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1476 | atomic_inc(&r1_bio->behind_remaining); | |
1477 | } | |
1478 | ||
1f68f0c4 N |
1479 | r1_bio->bios[i] = mbio; |
1480 | ||
4f024f37 | 1481 | mbio->bi_iter.bi_sector = (r1_bio->sector + |
1f68f0c4 | 1482 | conf->mirrors[i].rdev->data_offset); |
74d46992 | 1483 | bio_set_dev(mbio, conf->mirrors[i].rdev->bdev); |
1f68f0c4 | 1484 | mbio->bi_end_io = raid1_end_write_request; |
a682e003 | 1485 | mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); |
212e7eb7 N |
1486 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && |
1487 | !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && | |
1488 | conf->raid_disks - mddev->degraded > 1) | |
1489 | mbio->bi_opf |= MD_FAILFAST; | |
1f68f0c4 N |
1490 | mbio->bi_private = r1_bio; |
1491 | ||
1da177e4 | 1492 | atomic_inc(&r1_bio->remaining); |
f54a9d0e | 1493 | |
109e3765 | 1494 | if (mddev->gendisk) |
74d46992 | 1495 | trace_block_bio_remap(mbio->bi_disk->queue, |
109e3765 N |
1496 | mbio, disk_devt(mddev->gendisk), |
1497 | r1_bio->sector); | |
1498 | /* flush_pending_writes() needs access to the rdev so...*/ | |
74d46992 | 1499 | mbio->bi_disk = (void *)conf->mirrors[i].rdev; |
109e3765 | 1500 | |
f54a9d0e N |
1501 | cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); |
1502 | if (cb) | |
1503 | plug = container_of(cb, struct raid1_plug_cb, cb); | |
1504 | else | |
1505 | plug = NULL; | |
f54a9d0e N |
1506 | if (plug) { |
1507 | bio_list_add(&plug->pending, mbio); | |
1508 | plug->pending_cnt++; | |
1509 | } else { | |
23b245c0 | 1510 | spin_lock_irqsave(&conf->device_lock, flags); |
f54a9d0e N |
1511 | bio_list_add(&conf->pending_bio_list, mbio); |
1512 | conf->pending_count++; | |
23b245c0 | 1513 | spin_unlock_irqrestore(&conf->device_lock, flags); |
b357f04a | 1514 | md_wakeup_thread(mddev->thread); |
23b245c0 | 1515 | } |
1da177e4 | 1516 | } |
1f68f0c4 | 1517 | |
079fa166 N |
1518 | r1_bio_write_done(r1_bio); |
1519 | ||
1520 | /* In case raid1d snuck in to freeze_array */ | |
1521 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1522 | } |
1523 | ||
cc27b0c7 | 1524 | static bool raid1_make_request(struct mddev *mddev, struct bio *bio) |
3b046a97 | 1525 | { |
fd76863e | 1526 | sector_t sectors; |
3b046a97 | 1527 | |
aff8da09 SL |
1528 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
1529 | md_flush_request(mddev, bio); | |
cc27b0c7 | 1530 | return true; |
aff8da09 | 1531 | } |
3b046a97 | 1532 | |
c230e7e5 N |
1533 | /* |
1534 | * There is a limit to the maximum size, but | |
1535 | * the read/write handler might find a lower limit | |
1536 | * due to bad blocks. To avoid multiple splits, | |
1537 | * we pass the maximum number of sectors down | |
1538 | * and let the lower level perform the split. | |
1539 | */ | |
1540 | sectors = align_to_barrier_unit_end( | |
1541 | bio->bi_iter.bi_sector, bio_sectors(bio)); | |
61eb2b43 | 1542 | |
c230e7e5 | 1543 | if (bio_data_dir(bio) == READ) |
689389a0 | 1544 | raid1_read_request(mddev, bio, sectors, NULL); |
cc27b0c7 N |
1545 | else { |
1546 | if (!md_write_start(mddev,bio)) | |
1547 | return false; | |
c230e7e5 | 1548 | raid1_write_request(mddev, bio, sectors); |
cc27b0c7 N |
1549 | } |
1550 | return true; | |
3b046a97 RL |
1551 | } |
1552 | ||
849674e4 | 1553 | static void raid1_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1554 | { |
e8096360 | 1555 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1556 | int i; |
1557 | ||
1558 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1559 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1560 | rcu_read_lock(); |
1561 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1562 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1563 | seq_printf(seq, "%s", |
ddac7c7e N |
1564 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1565 | } | |
1566 | rcu_read_unlock(); | |
1da177e4 LT |
1567 | seq_printf(seq, "]"); |
1568 | } | |
1569 | ||
849674e4 | 1570 | static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1571 | { |
1572 | char b[BDEVNAME_SIZE]; | |
e8096360 | 1573 | struct r1conf *conf = mddev->private; |
423f04d6 | 1574 | unsigned long flags; |
1da177e4 LT |
1575 | |
1576 | /* | |
1577 | * If it is not operational, then we have already marked it as dead | |
1578 | * else if it is the last working disks, ignore the error, let the | |
1579 | * next level up know. | |
1580 | * else mark the drive as failed | |
1581 | */ | |
2e52d449 | 1582 | spin_lock_irqsave(&conf->device_lock, flags); |
b2d444d7 | 1583 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1584 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1585 | /* |
1586 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1587 | * normal single drive. |
1588 | * However don't try a recovery from this drive as | |
1589 | * it is very likely to fail. | |
1da177e4 | 1590 | */ |
5389042f | 1591 | conf->recovery_disabled = mddev->recovery_disabled; |
2e52d449 | 1592 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 1593 | return; |
4044ba58 | 1594 | } |
de393cde | 1595 | set_bit(Blocked, &rdev->flags); |
c04be0aa | 1596 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1da177e4 | 1597 | mddev->degraded++; |
dd00a99e | 1598 | set_bit(Faulty, &rdev->flags); |
dd00a99e N |
1599 | } else |
1600 | set_bit(Faulty, &rdev->flags); | |
423f04d6 | 1601 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2446dba0 N |
1602 | /* |
1603 | * if recovery is running, make sure it aborts. | |
1604 | */ | |
1605 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2953079c SL |
1606 | set_mask_bits(&mddev->sb_flags, 0, |
1607 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
1d41c216 N |
1608 | pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" |
1609 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
1610 | mdname(mddev), bdevname(rdev->bdev, b), | |
1611 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1612 | } |
1613 | ||
e8096360 | 1614 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1615 | { |
1616 | int i; | |
1da177e4 | 1617 | |
1d41c216 | 1618 | pr_debug("RAID1 conf printout:\n"); |
1da177e4 | 1619 | if (!conf) { |
1d41c216 | 1620 | pr_debug("(!conf)\n"); |
1da177e4 LT |
1621 | return; |
1622 | } | |
1d41c216 N |
1623 | pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1624 | conf->raid_disks); | |
1da177e4 | 1625 | |
ddac7c7e | 1626 | rcu_read_lock(); |
1da177e4 LT |
1627 | for (i = 0; i < conf->raid_disks; i++) { |
1628 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1629 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1630 | if (rdev) |
1d41c216 N |
1631 | pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", |
1632 | i, !test_bit(In_sync, &rdev->flags), | |
1633 | !test_bit(Faulty, &rdev->flags), | |
1634 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1635 | } |
ddac7c7e | 1636 | rcu_read_unlock(); |
1da177e4 LT |
1637 | } |
1638 | ||
e8096360 | 1639 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1640 | { |
f6eca2d4 ND |
1641 | int idx; |
1642 | ||
1643 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) { | |
1644 | _wait_barrier(conf, idx); | |
1645 | _allow_barrier(conf, idx); | |
1646 | } | |
1da177e4 LT |
1647 | |
1648 | mempool_destroy(conf->r1buf_pool); | |
1649 | conf->r1buf_pool = NULL; | |
1650 | } | |
1651 | ||
fd01b88c | 1652 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1653 | { |
1654 | int i; | |
e8096360 | 1655 | struct r1conf *conf = mddev->private; |
6b965620 N |
1656 | int count = 0; |
1657 | unsigned long flags; | |
1da177e4 LT |
1658 | |
1659 | /* | |
f72ffdd6 | 1660 | * Find all failed disks within the RAID1 configuration |
ddac7c7e N |
1661 | * and mark them readable. |
1662 | * Called under mddev lock, so rcu protection not needed. | |
423f04d6 N |
1663 | * device_lock used to avoid races with raid1_end_read_request |
1664 | * which expects 'In_sync' flags and ->degraded to be consistent. | |
1da177e4 | 1665 | */ |
423f04d6 | 1666 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 1667 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 1668 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1669 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1670 | if (repl | |
1aee41f6 | 1671 | && !test_bit(Candidate, &repl->flags) |
8c7a2c2b N |
1672 | && repl->recovery_offset == MaxSector |
1673 | && !test_bit(Faulty, &repl->flags) | |
1674 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1675 | /* replacement has just become active */ | |
1676 | if (!rdev || | |
1677 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1678 | count++; | |
1679 | if (rdev) { | |
1680 | /* Replaced device not technically | |
1681 | * faulty, but we need to be sure | |
1682 | * it gets removed and never re-added | |
1683 | */ | |
1684 | set_bit(Faulty, &rdev->flags); | |
1685 | sysfs_notify_dirent_safe( | |
1686 | rdev->sysfs_state); | |
1687 | } | |
1688 | } | |
ddac7c7e | 1689 | if (rdev |
61e4947c | 1690 | && rdev->recovery_offset == MaxSector |
ddac7c7e | 1691 | && !test_bit(Faulty, &rdev->flags) |
c04be0aa | 1692 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1693 | count++; |
654e8b5a | 1694 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1695 | } |
1696 | } | |
6b965620 N |
1697 | mddev->degraded -= count; |
1698 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1699 | |
1700 | print_conf(conf); | |
6b965620 | 1701 | return count; |
1da177e4 LT |
1702 | } |
1703 | ||
fd01b88c | 1704 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1705 | { |
e8096360 | 1706 | struct r1conf *conf = mddev->private; |
199050ea | 1707 | int err = -EEXIST; |
41158c7e | 1708 | int mirror = 0; |
0eaf822c | 1709 | struct raid1_info *p; |
6c2fce2e | 1710 | int first = 0; |
30194636 | 1711 | int last = conf->raid_disks - 1; |
1da177e4 | 1712 | |
5389042f N |
1713 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1714 | return -EBUSY; | |
1715 | ||
1501efad DW |
1716 | if (md_integrity_add_rdev(rdev, mddev)) |
1717 | return -ENXIO; | |
1718 | ||
6c2fce2e NB |
1719 | if (rdev->raid_disk >= 0) |
1720 | first = last = rdev->raid_disk; | |
1721 | ||
70bcecdb GR |
1722 | /* |
1723 | * find the disk ... but prefer rdev->saved_raid_disk | |
1724 | * if possible. | |
1725 | */ | |
1726 | if (rdev->saved_raid_disk >= 0 && | |
1727 | rdev->saved_raid_disk >= first && | |
1728 | conf->mirrors[rdev->saved_raid_disk].rdev == NULL) | |
1729 | first = last = rdev->saved_raid_disk; | |
1730 | ||
7ef449d1 N |
1731 | for (mirror = first; mirror <= last; mirror++) { |
1732 | p = conf->mirrors+mirror; | |
1733 | if (!p->rdev) { | |
1da177e4 | 1734 | |
9092c02d JB |
1735 | if (mddev->gendisk) |
1736 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1737 | rdev->data_offset << 9); | |
1da177e4 LT |
1738 | |
1739 | p->head_position = 0; | |
1740 | rdev->raid_disk = mirror; | |
199050ea | 1741 | err = 0; |
6aea114a N |
1742 | /* As all devices are equivalent, we don't need a full recovery |
1743 | * if this was recently any drive of the array | |
1744 | */ | |
1745 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1746 | conf->fullsync = 1; |
d6065f7b | 1747 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1748 | break; |
1749 | } | |
7ef449d1 N |
1750 | if (test_bit(WantReplacement, &p->rdev->flags) && |
1751 | p[conf->raid_disks].rdev == NULL) { | |
1752 | /* Add this device as a replacement */ | |
1753 | clear_bit(In_sync, &rdev->flags); | |
1754 | set_bit(Replacement, &rdev->flags); | |
1755 | rdev->raid_disk = mirror; | |
1756 | err = 0; | |
1757 | conf->fullsync = 1; | |
1758 | rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); | |
1759 | break; | |
1760 | } | |
1761 | } | |
9092c02d | 1762 | if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) |
8b904b5b | 1763 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue); |
1da177e4 | 1764 | print_conf(conf); |
199050ea | 1765 | return err; |
1da177e4 LT |
1766 | } |
1767 | ||
b8321b68 | 1768 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1769 | { |
e8096360 | 1770 | struct r1conf *conf = mddev->private; |
1da177e4 | 1771 | int err = 0; |
b8321b68 | 1772 | int number = rdev->raid_disk; |
0eaf822c | 1773 | struct raid1_info *p = conf->mirrors + number; |
1da177e4 | 1774 | |
b014f14c N |
1775 | if (rdev != p->rdev) |
1776 | p = conf->mirrors + conf->raid_disks + number; | |
1777 | ||
1da177e4 | 1778 | print_conf(conf); |
b8321b68 | 1779 | if (rdev == p->rdev) { |
b2d444d7 | 1780 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1781 | atomic_read(&rdev->nr_pending)) { |
1782 | err = -EBUSY; | |
1783 | goto abort; | |
1784 | } | |
046abeed | 1785 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1786 | * is not possible. |
1787 | */ | |
1788 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1789 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1790 | mddev->degraded < conf->raid_disks) { |
1791 | err = -EBUSY; | |
1792 | goto abort; | |
1793 | } | |
1da177e4 | 1794 | p->rdev = NULL; |
d787be40 N |
1795 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
1796 | synchronize_rcu(); | |
1797 | if (atomic_read(&rdev->nr_pending)) { | |
1798 | /* lost the race, try later */ | |
1799 | err = -EBUSY; | |
1800 | p->rdev = rdev; | |
1801 | goto abort; | |
1802 | } | |
1803 | } | |
1804 | if (conf->mirrors[conf->raid_disks + number].rdev) { | |
8c7a2c2b N |
1805 | /* We just removed a device that is being replaced. |
1806 | * Move down the replacement. We drain all IO before | |
1807 | * doing this to avoid confusion. | |
1808 | */ | |
1809 | struct md_rdev *repl = | |
1810 | conf->mirrors[conf->raid_disks + number].rdev; | |
e2d59925 | 1811 | freeze_array(conf, 0); |
3de59bb9 YY |
1812 | if (atomic_read(&repl->nr_pending)) { |
1813 | /* It means that some queued IO of retry_list | |
1814 | * hold repl. Thus, we cannot set replacement | |
1815 | * as NULL, avoiding rdev NULL pointer | |
1816 | * dereference in sync_request_write and | |
1817 | * handle_write_finished. | |
1818 | */ | |
1819 | err = -EBUSY; | |
1820 | unfreeze_array(conf); | |
1821 | goto abort; | |
1822 | } | |
8c7a2c2b N |
1823 | clear_bit(Replacement, &repl->flags); |
1824 | p->rdev = repl; | |
1825 | conf->mirrors[conf->raid_disks + number].rdev = NULL; | |
e2d59925 | 1826 | unfreeze_array(conf); |
e5bc9c3c GJ |
1827 | } |
1828 | ||
1829 | clear_bit(WantReplacement, &rdev->flags); | |
a91a2785 | 1830 | err = md_integrity_register(mddev); |
1da177e4 LT |
1831 | } |
1832 | abort: | |
1833 | ||
1834 | print_conf(conf); | |
1835 | return err; | |
1836 | } | |
1837 | ||
4246a0b6 | 1838 | static void end_sync_read(struct bio *bio) |
1da177e4 | 1839 | { |
98d30c58 | 1840 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
1da177e4 | 1841 | |
0fc280f6 | 1842 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1843 | |
1da177e4 LT |
1844 | /* |
1845 | * we have read a block, now it needs to be re-written, | |
1846 | * or re-read if the read failed. | |
1847 | * We don't do much here, just schedule handling by raid1d | |
1848 | */ | |
4e4cbee9 | 1849 | if (!bio->bi_status) |
1da177e4 | 1850 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1851 | |
1852 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1853 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1854 | } |
1855 | ||
4246a0b6 | 1856 | static void end_sync_write(struct bio *bio) |
1da177e4 | 1857 | { |
4e4cbee9 | 1858 | int uptodate = !bio->bi_status; |
98d30c58 | 1859 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
fd01b88c | 1860 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1861 | struct r1conf *conf = mddev->private; |
4367af55 N |
1862 | sector_t first_bad; |
1863 | int bad_sectors; | |
854abd75 | 1864 | struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; |
ba3ae3be | 1865 | |
6b1117d5 | 1866 | if (!uptodate) { |
57dab0bd | 1867 | sector_t sync_blocks = 0; |
6b1117d5 N |
1868 | sector_t s = r1_bio->sector; |
1869 | long sectors_to_go = r1_bio->sectors; | |
1870 | /* make sure these bits doesn't get cleared. */ | |
1871 | do { | |
5e3db645 | 1872 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1873 | &sync_blocks, 1); |
1874 | s += sync_blocks; | |
1875 | sectors_to_go -= sync_blocks; | |
1876 | } while (sectors_to_go > 0); | |
854abd75 N |
1877 | set_bit(WriteErrorSeen, &rdev->flags); |
1878 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
1879 | set_bit(MD_RECOVERY_NEEDED, & |
1880 | mddev->recovery); | |
d8f05d29 | 1881 | set_bit(R1BIO_WriteError, &r1_bio->state); |
854abd75 | 1882 | } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
3a9f28a5 N |
1883 | &first_bad, &bad_sectors) && |
1884 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1885 | r1_bio->sector, | |
1886 | r1_bio->sectors, | |
1887 | &first_bad, &bad_sectors) | |
1888 | ) | |
4367af55 | 1889 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1890 | |
1da177e4 | 1891 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1892 | int s = r1_bio->sectors; |
d8f05d29 N |
1893 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1894 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1895 | reschedule_retry(r1_bio); |
1896 | else { | |
1897 | put_buf(r1_bio); | |
1898 | md_done_sync(mddev, s, uptodate); | |
1899 | } | |
1da177e4 | 1900 | } |
1da177e4 LT |
1901 | } |
1902 | ||
3cb03002 | 1903 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1904 | int sectors, struct page *page, int rw) |
1905 | { | |
796a5cf0 | 1906 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) |
d8f05d29 N |
1907 | /* success */ |
1908 | return 1; | |
19d67169 | 1909 | if (rw == WRITE) { |
d8f05d29 | 1910 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1911 | if (!test_and_set_bit(WantReplacement, |
1912 | &rdev->flags)) | |
1913 | set_bit(MD_RECOVERY_NEEDED, & | |
1914 | rdev->mddev->recovery); | |
1915 | } | |
d8f05d29 N |
1916 | /* need to record an error - either for the block or the device */ |
1917 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1918 | md_error(rdev->mddev, rdev); | |
1919 | return 0; | |
1920 | } | |
1921 | ||
9f2c9d12 | 1922 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1923 | { |
a68e5870 N |
1924 | /* Try some synchronous reads of other devices to get |
1925 | * good data, much like with normal read errors. Only | |
1926 | * read into the pages we already have so we don't | |
1927 | * need to re-issue the read request. | |
1928 | * We don't need to freeze the array, because being in an | |
1929 | * active sync request, there is no normal IO, and | |
1930 | * no overlapping syncs. | |
06f60385 N |
1931 | * We don't need to check is_badblock() again as we |
1932 | * made sure that anything with a bad block in range | |
1933 | * will have bi_end_io clear. | |
a68e5870 | 1934 | */ |
fd01b88c | 1935 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1936 | struct r1conf *conf = mddev->private; |
a68e5870 | 1937 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
44cf0f4d | 1938 | struct page **pages = get_resync_pages(bio)->pages; |
a68e5870 N |
1939 | sector_t sect = r1_bio->sector; |
1940 | int sectors = r1_bio->sectors; | |
1941 | int idx = 0; | |
2e52d449 N |
1942 | struct md_rdev *rdev; |
1943 | ||
1944 | rdev = conf->mirrors[r1_bio->read_disk].rdev; | |
1945 | if (test_bit(FailFast, &rdev->flags)) { | |
1946 | /* Don't try recovering from here - just fail it | |
1947 | * ... unless it is the last working device of course */ | |
1948 | md_error(mddev, rdev); | |
1949 | if (test_bit(Faulty, &rdev->flags)) | |
1950 | /* Don't try to read from here, but make sure | |
1951 | * put_buf does it's thing | |
1952 | */ | |
1953 | bio->bi_end_io = end_sync_write; | |
1954 | } | |
a68e5870 N |
1955 | |
1956 | while(sectors) { | |
1957 | int s = sectors; | |
1958 | int d = r1_bio->read_disk; | |
1959 | int success = 0; | |
78d7f5f7 | 1960 | int start; |
a68e5870 N |
1961 | |
1962 | if (s > (PAGE_SIZE>>9)) | |
1963 | s = PAGE_SIZE >> 9; | |
1964 | do { | |
1965 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1966 | /* No rcu protection needed here devices | |
1967 | * can only be removed when no resync is | |
1968 | * active, and resync is currently active | |
1969 | */ | |
1970 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1971 | if (sync_page_io(rdev, sect, s<<9, |
44cf0f4d | 1972 | pages[idx], |
796a5cf0 | 1973 | REQ_OP_READ, 0, false)) { |
a68e5870 N |
1974 | success = 1; |
1975 | break; | |
1976 | } | |
1977 | } | |
1978 | d++; | |
8f19ccb2 | 1979 | if (d == conf->raid_disks * 2) |
a68e5870 N |
1980 | d = 0; |
1981 | } while (!success && d != r1_bio->read_disk); | |
1982 | ||
78d7f5f7 | 1983 | if (!success) { |
a68e5870 | 1984 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1985 | int abort = 0; |
1986 | /* Cannot read from anywhere, this block is lost. | |
1987 | * Record a bad block on each device. If that doesn't | |
1988 | * work just disable and interrupt the recovery. | |
1989 | * Don't fail devices as that won't really help. | |
1990 | */ | |
1d41c216 | 1991 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
74d46992 | 1992 | mdname(mddev), bio_devname(bio, b), |
1d41c216 | 1993 | (unsigned long long)r1_bio->sector); |
8f19ccb2 | 1994 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
1995 | rdev = conf->mirrors[d].rdev; |
1996 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
1997 | continue; | |
1998 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1999 | abort = 1; | |
2000 | } | |
2001 | if (abort) { | |
d890fa2b N |
2002 | conf->recovery_disabled = |
2003 | mddev->recovery_disabled; | |
3a9f28a5 N |
2004 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
2005 | md_done_sync(mddev, r1_bio->sectors, 0); | |
2006 | put_buf(r1_bio); | |
2007 | return 0; | |
2008 | } | |
2009 | /* Try next page */ | |
2010 | sectors -= s; | |
2011 | sect += s; | |
2012 | idx++; | |
2013 | continue; | |
d11c171e | 2014 | } |
78d7f5f7 N |
2015 | |
2016 | start = d; | |
2017 | /* write it back and re-read */ | |
2018 | while (d != r1_bio->read_disk) { | |
2019 | if (d == 0) | |
8f19ccb2 | 2020 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2021 | d--; |
2022 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2023 | continue; | |
2024 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2025 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2026 | pages[idx], |
d8f05d29 | 2027 | WRITE) == 0) { |
78d7f5f7 N |
2028 | r1_bio->bios[d]->bi_end_io = NULL; |
2029 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 2030 | } |
78d7f5f7 N |
2031 | } |
2032 | d = start; | |
2033 | while (d != r1_bio->read_disk) { | |
2034 | if (d == 0) | |
8f19ccb2 | 2035 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2036 | d--; |
2037 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2038 | continue; | |
2039 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2040 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2041 | pages[idx], |
d8f05d29 | 2042 | READ) != 0) |
9d3d8011 | 2043 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 2044 | } |
a68e5870 N |
2045 | sectors -= s; |
2046 | sect += s; | |
2047 | idx ++; | |
2048 | } | |
78d7f5f7 | 2049 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
4e4cbee9 | 2050 | bio->bi_status = 0; |
a68e5870 N |
2051 | return 1; |
2052 | } | |
2053 | ||
c95e6385 | 2054 | static void process_checks(struct r1bio *r1_bio) |
a68e5870 N |
2055 | { |
2056 | /* We have read all readable devices. If we haven't | |
2057 | * got the block, then there is no hope left. | |
2058 | * If we have, then we want to do a comparison | |
2059 | * and skip the write if everything is the same. | |
2060 | * If any blocks failed to read, then we need to | |
2061 | * attempt an over-write | |
2062 | */ | |
fd01b88c | 2063 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2064 | struct r1conf *conf = mddev->private; |
a68e5870 N |
2065 | int primary; |
2066 | int i; | |
f4380a91 | 2067 | int vcnt; |
a68e5870 | 2068 | |
30bc9b53 N |
2069 | /* Fix variable parts of all bios */ |
2070 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); | |
2071 | for (i = 0; i < conf->raid_disks * 2; i++) { | |
4e4cbee9 | 2072 | blk_status_t status; |
30bc9b53 | 2073 | struct bio *b = r1_bio->bios[i]; |
98d30c58 | 2074 | struct resync_pages *rp = get_resync_pages(b); |
30bc9b53 N |
2075 | if (b->bi_end_io != end_sync_read) |
2076 | continue; | |
4246a0b6 | 2077 | /* fixup the bio for reuse, but preserve errno */ |
4e4cbee9 | 2078 | status = b->bi_status; |
30bc9b53 | 2079 | bio_reset(b); |
4e4cbee9 | 2080 | b->bi_status = status; |
4f024f37 | 2081 | b->bi_iter.bi_sector = r1_bio->sector + |
30bc9b53 | 2082 | conf->mirrors[i].rdev->data_offset; |
74d46992 | 2083 | bio_set_dev(b, conf->mirrors[i].rdev->bdev); |
30bc9b53 | 2084 | b->bi_end_io = end_sync_read; |
98d30c58 ML |
2085 | rp->raid_bio = r1_bio; |
2086 | b->bi_private = rp; | |
30bc9b53 | 2087 | |
fb0eb5df ML |
2088 | /* initialize bvec table again */ |
2089 | md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); | |
30bc9b53 | 2090 | } |
8f19ccb2 | 2091 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 | 2092 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
4e4cbee9 | 2093 | !r1_bio->bios[primary]->bi_status) { |
a68e5870 N |
2094 | r1_bio->bios[primary]->bi_end_io = NULL; |
2095 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
2096 | break; | |
2097 | } | |
2098 | r1_bio->read_disk = primary; | |
8f19ccb2 | 2099 | for (i = 0; i < conf->raid_disks * 2; i++) { |
78d7f5f7 | 2100 | int j; |
78d7f5f7 N |
2101 | struct bio *pbio = r1_bio->bios[primary]; |
2102 | struct bio *sbio = r1_bio->bios[i]; | |
4e4cbee9 | 2103 | blk_status_t status = sbio->bi_status; |
44cf0f4d ML |
2104 | struct page **ppages = get_resync_pages(pbio)->pages; |
2105 | struct page **spages = get_resync_pages(sbio)->pages; | |
60928a91 | 2106 | struct bio_vec *bi; |
8fc04e6e | 2107 | int page_len[RESYNC_PAGES] = { 0 }; |
a68e5870 | 2108 | |
2aabaa65 | 2109 | if (sbio->bi_end_io != end_sync_read) |
78d7f5f7 | 2110 | continue; |
4246a0b6 | 2111 | /* Now we can 'fixup' the error value */ |
4e4cbee9 | 2112 | sbio->bi_status = 0; |
78d7f5f7 | 2113 | |
60928a91 ML |
2114 | bio_for_each_segment_all(bi, sbio, j) |
2115 | page_len[j] = bi->bv_len; | |
2116 | ||
4e4cbee9 | 2117 | if (!status) { |
78d7f5f7 | 2118 | for (j = vcnt; j-- ; ) { |
44cf0f4d ML |
2119 | if (memcmp(page_address(ppages[j]), |
2120 | page_address(spages[j]), | |
60928a91 | 2121 | page_len[j])) |
78d7f5f7 | 2122 | break; |
69382e85 | 2123 | } |
78d7f5f7 N |
2124 | } else |
2125 | j = 0; | |
2126 | if (j >= 0) | |
7f7583d4 | 2127 | atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
78d7f5f7 | 2128 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
4e4cbee9 | 2129 | && !status)) { |
78d7f5f7 N |
2130 | /* No need to write to this device. */ |
2131 | sbio->bi_end_io = NULL; | |
2132 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
2133 | continue; | |
2134 | } | |
d3b45c2a KO |
2135 | |
2136 | bio_copy_data(sbio, pbio); | |
78d7f5f7 | 2137 | } |
a68e5870 N |
2138 | } |
2139 | ||
9f2c9d12 | 2140 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 2141 | { |
e8096360 | 2142 | struct r1conf *conf = mddev->private; |
a68e5870 | 2143 | int i; |
8f19ccb2 | 2144 | int disks = conf->raid_disks * 2; |
037d2ff6 | 2145 | struct bio *wbio; |
a68e5870 | 2146 | |
a68e5870 N |
2147 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
2148 | /* ouch - failed to read all of that. */ | |
2149 | if (!fix_sync_read_error(r1_bio)) | |
2150 | return; | |
7ca78d57 N |
2151 | |
2152 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
c95e6385 N |
2153 | process_checks(r1_bio); |
2154 | ||
d11c171e N |
2155 | /* |
2156 | * schedule writes | |
2157 | */ | |
1da177e4 LT |
2158 | atomic_set(&r1_bio->remaining, 1); |
2159 | for (i = 0; i < disks ; i++) { | |
2160 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
2161 | if (wbio->bi_end_io == NULL || |
2162 | (wbio->bi_end_io == end_sync_read && | |
2163 | (i == r1_bio->read_disk || | |
2164 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 | 2165 | continue; |
0c9d5b12 N |
2166 | if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) |
2167 | continue; | |
1da177e4 | 2168 | |
796a5cf0 | 2169 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
212e7eb7 N |
2170 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) |
2171 | wbio->bi_opf |= MD_FAILFAST; | |
2172 | ||
3e198f78 | 2173 | wbio->bi_end_io = end_sync_write; |
1da177e4 | 2174 | atomic_inc(&r1_bio->remaining); |
aa8b57aa | 2175 | md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); |
191ea9b2 | 2176 | |
1da177e4 LT |
2177 | generic_make_request(wbio); |
2178 | } | |
2179 | ||
2180 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 2181 | /* if we're here, all write(s) have completed, so clean up */ |
58e94ae1 N |
2182 | int s = r1_bio->sectors; |
2183 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
2184 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2185 | reschedule_retry(r1_bio); | |
2186 | else { | |
2187 | put_buf(r1_bio); | |
2188 | md_done_sync(mddev, s, 1); | |
2189 | } | |
1da177e4 LT |
2190 | } |
2191 | } | |
2192 | ||
2193 | /* | |
2194 | * This is a kernel thread which: | |
2195 | * | |
2196 | * 1. Retries failed read operations on working mirrors. | |
2197 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 2198 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
2199 | */ |
2200 | ||
e8096360 | 2201 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
2202 | sector_t sect, int sectors) |
2203 | { | |
fd01b88c | 2204 | struct mddev *mddev = conf->mddev; |
867868fb N |
2205 | while(sectors) { |
2206 | int s = sectors; | |
2207 | int d = read_disk; | |
2208 | int success = 0; | |
2209 | int start; | |
3cb03002 | 2210 | struct md_rdev *rdev; |
867868fb N |
2211 | |
2212 | if (s > (PAGE_SIZE>>9)) | |
2213 | s = PAGE_SIZE >> 9; | |
2214 | ||
2215 | do { | |
d2eb35ac N |
2216 | sector_t first_bad; |
2217 | int bad_sectors; | |
2218 | ||
707a6a42 N |
2219 | rcu_read_lock(); |
2220 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2221 | if (rdev && |
da8840a7 | 2222 | (test_bit(In_sync, &rdev->flags) || |
2223 | (!test_bit(Faulty, &rdev->flags) && | |
2224 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac | 2225 | is_badblock(rdev, sect, s, |
707a6a42 N |
2226 | &first_bad, &bad_sectors) == 0) { |
2227 | atomic_inc(&rdev->nr_pending); | |
2228 | rcu_read_unlock(); | |
2229 | if (sync_page_io(rdev, sect, s<<9, | |
796a5cf0 | 2230 | conf->tmppage, REQ_OP_READ, 0, false)) |
707a6a42 N |
2231 | success = 1; |
2232 | rdev_dec_pending(rdev, mddev); | |
2233 | if (success) | |
2234 | break; | |
2235 | } else | |
2236 | rcu_read_unlock(); | |
2237 | d++; | |
2238 | if (d == conf->raid_disks * 2) | |
2239 | d = 0; | |
867868fb N |
2240 | } while (!success && d != read_disk); |
2241 | ||
2242 | if (!success) { | |
d8f05d29 | 2243 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 2244 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
2245 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
2246 | md_error(mddev, rdev); | |
867868fb N |
2247 | break; |
2248 | } | |
2249 | /* write it back and re-read */ | |
2250 | start = d; | |
2251 | while (d != read_disk) { | |
2252 | if (d==0) | |
8f19ccb2 | 2253 | d = conf->raid_disks * 2; |
867868fb | 2254 | d--; |
707a6a42 N |
2255 | rcu_read_lock(); |
2256 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2257 | if (rdev && |
707a6a42 N |
2258 | !test_bit(Faulty, &rdev->flags)) { |
2259 | atomic_inc(&rdev->nr_pending); | |
2260 | rcu_read_unlock(); | |
d8f05d29 N |
2261 | r1_sync_page_io(rdev, sect, s, |
2262 | conf->tmppage, WRITE); | |
707a6a42 N |
2263 | rdev_dec_pending(rdev, mddev); |
2264 | } else | |
2265 | rcu_read_unlock(); | |
867868fb N |
2266 | } |
2267 | d = start; | |
2268 | while (d != read_disk) { | |
2269 | char b[BDEVNAME_SIZE]; | |
2270 | if (d==0) | |
8f19ccb2 | 2271 | d = conf->raid_disks * 2; |
867868fb | 2272 | d--; |
707a6a42 N |
2273 | rcu_read_lock(); |
2274 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2275 | if (rdev && |
b8cb6b4c | 2276 | !test_bit(Faulty, &rdev->flags)) { |
707a6a42 N |
2277 | atomic_inc(&rdev->nr_pending); |
2278 | rcu_read_unlock(); | |
d8f05d29 N |
2279 | if (r1_sync_page_io(rdev, sect, s, |
2280 | conf->tmppage, READ)) { | |
867868fb | 2281 | atomic_add(s, &rdev->corrected_errors); |
1d41c216 N |
2282 | pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", |
2283 | mdname(mddev), s, | |
2284 | (unsigned long long)(sect + | |
2285 | rdev->data_offset), | |
2286 | bdevname(rdev->bdev, b)); | |
867868fb | 2287 | } |
707a6a42 N |
2288 | rdev_dec_pending(rdev, mddev); |
2289 | } else | |
2290 | rcu_read_unlock(); | |
867868fb N |
2291 | } |
2292 | sectors -= s; | |
2293 | sect += s; | |
2294 | } | |
2295 | } | |
2296 | ||
9f2c9d12 | 2297 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 2298 | { |
fd01b88c | 2299 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2300 | struct r1conf *conf = mddev->private; |
3cb03002 | 2301 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
2302 | |
2303 | /* bio has the data to be written to device 'i' where | |
2304 | * we just recently had a write error. | |
2305 | * We repeatedly clone the bio and trim down to one block, | |
2306 | * then try the write. Where the write fails we record | |
2307 | * a bad block. | |
2308 | * It is conceivable that the bio doesn't exactly align with | |
2309 | * blocks. We must handle this somehow. | |
2310 | * | |
2311 | * We currently own a reference on the rdev. | |
2312 | */ | |
2313 | ||
2314 | int block_sectors; | |
2315 | sector_t sector; | |
2316 | int sectors; | |
2317 | int sect_to_write = r1_bio->sectors; | |
2318 | int ok = 1; | |
2319 | ||
2320 | if (rdev->badblocks.shift < 0) | |
2321 | return 0; | |
2322 | ||
ab713cdc ND |
2323 | block_sectors = roundup(1 << rdev->badblocks.shift, |
2324 | bdev_logical_block_size(rdev->bdev) >> 9); | |
cd5ff9a1 N |
2325 | sector = r1_bio->sector; |
2326 | sectors = ((sector + block_sectors) | |
2327 | & ~(sector_t)(block_sectors - 1)) | |
2328 | - sector; | |
2329 | ||
cd5ff9a1 N |
2330 | while (sect_to_write) { |
2331 | struct bio *wbio; | |
2332 | if (sectors > sect_to_write) | |
2333 | sectors = sect_to_write; | |
2334 | /* Write at 'sector' for 'sectors'*/ | |
2335 | ||
b783863f | 2336 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
841c1316 ML |
2337 | wbio = bio_clone_fast(r1_bio->behind_master_bio, |
2338 | GFP_NOIO, | |
2339 | mddev->bio_set); | |
b783863f | 2340 | } else { |
d7a10308 ML |
2341 | wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, |
2342 | mddev->bio_set); | |
b783863f KO |
2343 | } |
2344 | ||
796a5cf0 | 2345 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
4f024f37 KO |
2346 | wbio->bi_iter.bi_sector = r1_bio->sector; |
2347 | wbio->bi_iter.bi_size = r1_bio->sectors << 9; | |
cd5ff9a1 | 2348 | |
6678d83f | 2349 | bio_trim(wbio, sector - r1_bio->sector, sectors); |
4f024f37 | 2350 | wbio->bi_iter.bi_sector += rdev->data_offset; |
74d46992 | 2351 | bio_set_dev(wbio, rdev->bdev); |
4e49ea4a MC |
2352 | |
2353 | if (submit_bio_wait(wbio) < 0) | |
cd5ff9a1 N |
2354 | /* failure! */ |
2355 | ok = rdev_set_badblocks(rdev, sector, | |
2356 | sectors, 0) | |
2357 | && ok; | |
2358 | ||
2359 | bio_put(wbio); | |
2360 | sect_to_write -= sectors; | |
2361 | sector += sectors; | |
2362 | sectors = block_sectors; | |
2363 | } | |
2364 | return ok; | |
2365 | } | |
2366 | ||
e8096360 | 2367 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2368 | { |
2369 | int m; | |
2370 | int s = r1_bio->sectors; | |
8f19ccb2 | 2371 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2372 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2373 | struct bio *bio = r1_bio->bios[m]; |
2374 | if (bio->bi_end_io == NULL) | |
2375 | continue; | |
4e4cbee9 | 2376 | if (!bio->bi_status && |
62096bce | 2377 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { |
c6563a8c | 2378 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce | 2379 | } |
4e4cbee9 | 2380 | if (bio->bi_status && |
62096bce N |
2381 | test_bit(R1BIO_WriteError, &r1_bio->state)) { |
2382 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2383 | md_error(conf->mddev, rdev); | |
2384 | } | |
2385 | } | |
2386 | put_buf(r1_bio); | |
2387 | md_done_sync(conf->mddev, s, 1); | |
2388 | } | |
2389 | ||
e8096360 | 2390 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2391 | { |
fd76863e | 2392 | int m, idx; |
55ce74d4 | 2393 | bool fail = false; |
fd76863e | 2394 | |
8f19ccb2 | 2395 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2396 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2397 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2398 | rdev_clear_badblocks(rdev, |
2399 | r1_bio->sector, | |
c6563a8c | 2400 | r1_bio->sectors, 0); |
62096bce N |
2401 | rdev_dec_pending(rdev, conf->mddev); |
2402 | } else if (r1_bio->bios[m] != NULL) { | |
2403 | /* This drive got a write error. We need to | |
2404 | * narrow down and record precise write | |
2405 | * errors. | |
2406 | */ | |
55ce74d4 | 2407 | fail = true; |
62096bce N |
2408 | if (!narrow_write_error(r1_bio, m)) { |
2409 | md_error(conf->mddev, | |
2410 | conf->mirrors[m].rdev); | |
2411 | /* an I/O failed, we can't clear the bitmap */ | |
2412 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2413 | } | |
2414 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2415 | conf->mddev); | |
2416 | } | |
55ce74d4 N |
2417 | if (fail) { |
2418 | spin_lock_irq(&conf->device_lock); | |
2419 | list_add(&r1_bio->retry_list, &conf->bio_end_io_list); | |
fd76863e | 2420 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2421 | atomic_inc(&conf->nr_queued[idx]); |
55ce74d4 | 2422 | spin_unlock_irq(&conf->device_lock); |
824e47da | 2423 | /* |
2424 | * In case freeze_array() is waiting for condition | |
2425 | * get_unqueued_pending() == extra to be true. | |
2426 | */ | |
2427 | wake_up(&conf->wait_barrier); | |
55ce74d4 | 2428 | md_wakeup_thread(conf->mddev->thread); |
bd8688a1 N |
2429 | } else { |
2430 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2431 | close_write(r1_bio); | |
55ce74d4 | 2432 | raid_end_bio_io(r1_bio); |
bd8688a1 | 2433 | } |
62096bce N |
2434 | } |
2435 | ||
e8096360 | 2436 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2437 | { |
fd01b88c | 2438 | struct mddev *mddev = conf->mddev; |
62096bce | 2439 | struct bio *bio; |
3cb03002 | 2440 | struct md_rdev *rdev; |
109e3765 | 2441 | sector_t bio_sector; |
62096bce N |
2442 | |
2443 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2444 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2445 | * the block and we can fix it. | |
2446 | * We freeze all other IO, and try reading the block from | |
2447 | * other devices. When we find one, we re-write | |
2448 | * and check it that fixes the read error. | |
2449 | * This is all done synchronously while the array is | |
2450 | * frozen | |
2451 | */ | |
7449f699 TM |
2452 | |
2453 | bio = r1_bio->bios[r1_bio->read_disk]; | |
109e3765 | 2454 | bio_sector = conf->mirrors[r1_bio->read_disk].rdev->data_offset + r1_bio->sector; |
7449f699 TM |
2455 | bio_put(bio); |
2456 | r1_bio->bios[r1_bio->read_disk] = NULL; | |
2457 | ||
2e52d449 N |
2458 | rdev = conf->mirrors[r1_bio->read_disk].rdev; |
2459 | if (mddev->ro == 0 | |
2460 | && !test_bit(FailFast, &rdev->flags)) { | |
e2d59925 | 2461 | freeze_array(conf, 1); |
62096bce N |
2462 | fix_read_error(conf, r1_bio->read_disk, |
2463 | r1_bio->sector, r1_bio->sectors); | |
2464 | unfreeze_array(conf); | |
7449f699 TM |
2465 | } else { |
2466 | r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; | |
2467 | } | |
2468 | ||
2e52d449 | 2469 | rdev_dec_pending(rdev, conf->mddev); |
689389a0 N |
2470 | allow_barrier(conf, r1_bio->sector); |
2471 | bio = r1_bio->master_bio; | |
62096bce | 2472 | |
689389a0 N |
2473 | /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ |
2474 | r1_bio->state = 0; | |
2475 | raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); | |
62096bce N |
2476 | } |
2477 | ||
4ed8731d | 2478 | static void raid1d(struct md_thread *thread) |
1da177e4 | 2479 | { |
4ed8731d | 2480 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2481 | struct r1bio *r1_bio; |
1da177e4 | 2482 | unsigned long flags; |
e8096360 | 2483 | struct r1conf *conf = mddev->private; |
1da177e4 | 2484 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2485 | struct blk_plug plug; |
fd76863e | 2486 | int idx; |
1da177e4 LT |
2487 | |
2488 | md_check_recovery(mddev); | |
e1dfa0a2 | 2489 | |
55ce74d4 | 2490 | if (!list_empty_careful(&conf->bio_end_io_list) && |
2953079c | 2491 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
55ce74d4 N |
2492 | LIST_HEAD(tmp); |
2493 | spin_lock_irqsave(&conf->device_lock, flags); | |
fd76863e | 2494 | if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
2495 | list_splice_init(&conf->bio_end_io_list, &tmp); | |
55ce74d4 N |
2496 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2497 | while (!list_empty(&tmp)) { | |
a452744b MP |
2498 | r1_bio = list_first_entry(&tmp, struct r1bio, |
2499 | retry_list); | |
55ce74d4 | 2500 | list_del(&r1_bio->retry_list); |
fd76863e | 2501 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2502 | atomic_dec(&conf->nr_queued[idx]); |
bd8688a1 N |
2503 | if (mddev->degraded) |
2504 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2505 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2506 | close_write(r1_bio); | |
55ce74d4 N |
2507 | raid_end_bio_io(r1_bio); |
2508 | } | |
2509 | } | |
2510 | ||
e1dfa0a2 | 2511 | blk_start_plug(&plug); |
1da177e4 | 2512 | for (;;) { |
191ea9b2 | 2513 | |
0021b7bc | 2514 | flush_pending_writes(conf); |
191ea9b2 | 2515 | |
a35e63ef N |
2516 | spin_lock_irqsave(&conf->device_lock, flags); |
2517 | if (list_empty(head)) { | |
2518 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2519 | break; |
a35e63ef | 2520 | } |
9f2c9d12 | 2521 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2522 | list_del(head->prev); |
fd76863e | 2523 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2524 | atomic_dec(&conf->nr_queued[idx]); |
1da177e4 LT |
2525 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2526 | ||
2527 | mddev = r1_bio->mddev; | |
070ec55d | 2528 | conf = mddev->private; |
4367af55 | 2529 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2530 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2531 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2532 | handle_sync_write_finished(conf, r1_bio); | |
2533 | else | |
4367af55 | 2534 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2535 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2536 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2537 | handle_write_finished(conf, r1_bio); | |
2538 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2539 | handle_read_error(conf, r1_bio); | |
2540 | else | |
c230e7e5 | 2541 | WARN_ON_ONCE(1); |
62096bce | 2542 | |
1d9d5241 | 2543 | cond_resched(); |
2953079c | 2544 | if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) |
de393cde | 2545 | md_check_recovery(mddev); |
1da177e4 | 2546 | } |
e1dfa0a2 | 2547 | blk_finish_plug(&plug); |
1da177e4 LT |
2548 | } |
2549 | ||
e8096360 | 2550 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2551 | { |
2552 | int buffs; | |
2553 | ||
2554 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2555 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2556 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2557 | conf->poolinfo); | |
2558 | if (!conf->r1buf_pool) | |
2559 | return -ENOMEM; | |
1da177e4 LT |
2560 | return 0; |
2561 | } | |
2562 | ||
208410b5 SL |
2563 | static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf) |
2564 | { | |
2565 | struct r1bio *r1bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); | |
2566 | struct resync_pages *rps; | |
2567 | struct bio *bio; | |
2568 | int i; | |
2569 | ||
2570 | for (i = conf->poolinfo->raid_disks; i--; ) { | |
2571 | bio = r1bio->bios[i]; | |
2572 | rps = bio->bi_private; | |
2573 | bio_reset(bio); | |
2574 | bio->bi_private = rps; | |
2575 | } | |
2576 | r1bio->master_bio = NULL; | |
2577 | return r1bio; | |
2578 | } | |
2579 | ||
1da177e4 LT |
2580 | /* |
2581 | * perform a "sync" on one "block" | |
2582 | * | |
2583 | * We need to make sure that no normal I/O request - particularly write | |
2584 | * requests - conflict with active sync requests. | |
2585 | * | |
2586 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2587 | * that can be installed to exclude normal IO requests. | |
2588 | */ | |
2589 | ||
849674e4 SL |
2590 | static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, |
2591 | int *skipped) | |
1da177e4 | 2592 | { |
e8096360 | 2593 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2594 | struct r1bio *r1_bio; |
1da177e4 LT |
2595 | struct bio *bio; |
2596 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2597 | int disk = -1; |
1da177e4 | 2598 | int i; |
3e198f78 N |
2599 | int wonly = -1; |
2600 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2601 | sector_t sync_blocks; |
e3b9703e | 2602 | int still_degraded = 0; |
06f60385 N |
2603 | int good_sectors = RESYNC_SECTORS; |
2604 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
fd76863e | 2605 | int idx = sector_to_idx(sector_nr); |
022e510f | 2606 | int page_idx = 0; |
1da177e4 LT |
2607 | |
2608 | if (!conf->r1buf_pool) | |
2609 | if (init_resync(conf)) | |
57afd89f | 2610 | return 0; |
1da177e4 | 2611 | |
58c0fed4 | 2612 | max_sector = mddev->dev_sectors; |
1da177e4 | 2613 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2614 | /* If we aborted, we need to abort the |
2615 | * sync on the 'current' bitmap chunk (there will | |
2616 | * only be one in raid1 resync. | |
2617 | * We can find the current addess in mddev->curr_resync | |
2618 | */ | |
6a806c51 N |
2619 | if (mddev->curr_resync < max_sector) /* aborted */ |
2620 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2621 | &sync_blocks, 1); |
6a806c51 | 2622 | else /* completed sync */ |
191ea9b2 | 2623 | conf->fullsync = 0; |
6a806c51 N |
2624 | |
2625 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 | 2626 | close_sync(conf); |
c40f341f GR |
2627 | |
2628 | if (mddev_is_clustered(mddev)) { | |
2629 | conf->cluster_sync_low = 0; | |
2630 | conf->cluster_sync_high = 0; | |
c40f341f | 2631 | } |
1da177e4 LT |
2632 | return 0; |
2633 | } | |
2634 | ||
07d84d10 N |
2635 | if (mddev->bitmap == NULL && |
2636 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2637 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2638 | conf->fullsync == 0) { |
2639 | *skipped = 1; | |
2640 | return max_sector - sector_nr; | |
2641 | } | |
6394cca5 N |
2642 | /* before building a request, check if we can skip these blocks.. |
2643 | * This call the bitmap_start_sync doesn't actually record anything | |
2644 | */ | |
e3b9703e | 2645 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2646 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2647 | /* We can skip this block, and probably several more */ |
2648 | *skipped = 1; | |
2649 | return sync_blocks; | |
2650 | } | |
17999be4 | 2651 | |
7ac50447 TM |
2652 | /* |
2653 | * If there is non-resync activity waiting for a turn, then let it | |
2654 | * though before starting on this new sync request. | |
2655 | */ | |
824e47da | 2656 | if (atomic_read(&conf->nr_waiting[idx])) |
7ac50447 TM |
2657 | schedule_timeout_uninterruptible(1); |
2658 | ||
c40f341f GR |
2659 | /* we are incrementing sector_nr below. To be safe, we check against |
2660 | * sector_nr + two times RESYNC_SECTORS | |
2661 | */ | |
2662 | ||
2663 | bitmap_cond_end_sync(mddev->bitmap, sector_nr, | |
2664 | mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); | |
208410b5 | 2665 | r1_bio = raid1_alloc_init_r1buf(conf); |
17999be4 | 2666 | |
c2fd4c94 | 2667 | raise_barrier(conf, sector_nr); |
1da177e4 | 2668 | |
3e198f78 | 2669 | rcu_read_lock(); |
1da177e4 | 2670 | /* |
3e198f78 N |
2671 | * If we get a correctably read error during resync or recovery, |
2672 | * we might want to read from a different device. So we | |
2673 | * flag all drives that could conceivably be read from for READ, | |
2674 | * and any others (which will be non-In_sync devices) for WRITE. | |
2675 | * If a read fails, we try reading from something else for which READ | |
2676 | * is OK. | |
1da177e4 | 2677 | */ |
1da177e4 | 2678 | |
1da177e4 LT |
2679 | r1_bio->mddev = mddev; |
2680 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2681 | r1_bio->state = 0; |
1da177e4 | 2682 | set_bit(R1BIO_IsSync, &r1_bio->state); |
fd76863e | 2683 | /* make sure good_sectors won't go across barrier unit boundary */ |
2684 | good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); | |
1da177e4 | 2685 | |
8f19ccb2 | 2686 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 2687 | struct md_rdev *rdev; |
1da177e4 | 2688 | bio = r1_bio->bios[i]; |
1da177e4 | 2689 | |
3e198f78 N |
2690 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2691 | if (rdev == NULL || | |
06f60385 | 2692 | test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
2693 | if (i < conf->raid_disks) |
2694 | still_degraded = 1; | |
3e198f78 | 2695 | } else if (!test_bit(In_sync, &rdev->flags)) { |
796a5cf0 | 2696 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
1da177e4 LT |
2697 | bio->bi_end_io = end_sync_write; |
2698 | write_targets ++; | |
3e198f78 N |
2699 | } else { |
2700 | /* may need to read from here */ | |
06f60385 N |
2701 | sector_t first_bad = MaxSector; |
2702 | int bad_sectors; | |
2703 | ||
2704 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2705 | &first_bad, &bad_sectors)) { | |
2706 | if (first_bad > sector_nr) | |
2707 | good_sectors = first_bad - sector_nr; | |
2708 | else { | |
2709 | bad_sectors -= (sector_nr - first_bad); | |
2710 | if (min_bad == 0 || | |
2711 | min_bad > bad_sectors) | |
2712 | min_bad = bad_sectors; | |
2713 | } | |
2714 | } | |
2715 | if (sector_nr < first_bad) { | |
2716 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2717 | if (wonly < 0) | |
2718 | wonly = i; | |
2719 | } else { | |
2720 | if (disk < 0) | |
2721 | disk = i; | |
2722 | } | |
796a5cf0 | 2723 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
06f60385 N |
2724 | bio->bi_end_io = end_sync_read; |
2725 | read_targets++; | |
d57368af AL |
2726 | } else if (!test_bit(WriteErrorSeen, &rdev->flags) && |
2727 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
2728 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { | |
2729 | /* | |
2730 | * The device is suitable for reading (InSync), | |
2731 | * but has bad block(s) here. Let's try to correct them, | |
2732 | * if we are doing resync or repair. Otherwise, leave | |
2733 | * this device alone for this sync request. | |
2734 | */ | |
796a5cf0 | 2735 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
d57368af AL |
2736 | bio->bi_end_io = end_sync_write; |
2737 | write_targets++; | |
3e198f78 | 2738 | } |
3e198f78 | 2739 | } |
06f60385 N |
2740 | if (bio->bi_end_io) { |
2741 | atomic_inc(&rdev->nr_pending); | |
4f024f37 | 2742 | bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; |
74d46992 | 2743 | bio_set_dev(bio, rdev->bdev); |
2e52d449 N |
2744 | if (test_bit(FailFast, &rdev->flags)) |
2745 | bio->bi_opf |= MD_FAILFAST; | |
06f60385 | 2746 | } |
1da177e4 | 2747 | } |
3e198f78 N |
2748 | rcu_read_unlock(); |
2749 | if (disk < 0) | |
2750 | disk = wonly; | |
2751 | r1_bio->read_disk = disk; | |
191ea9b2 | 2752 | |
06f60385 N |
2753 | if (read_targets == 0 && min_bad > 0) { |
2754 | /* These sectors are bad on all InSync devices, so we | |
2755 | * need to mark them bad on all write targets | |
2756 | */ | |
2757 | int ok = 1; | |
8f19ccb2 | 2758 | for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
06f60385 | 2759 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
a42f9d83 | 2760 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
06f60385 N |
2761 | ok = rdev_set_badblocks(rdev, sector_nr, |
2762 | min_bad, 0 | |
2763 | ) && ok; | |
2764 | } | |
2953079c | 2765 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
06f60385 N |
2766 | *skipped = 1; |
2767 | put_buf(r1_bio); | |
2768 | ||
2769 | if (!ok) { | |
2770 | /* Cannot record the badblocks, so need to | |
2771 | * abort the resync. | |
2772 | * If there are multiple read targets, could just | |
2773 | * fail the really bad ones ??? | |
2774 | */ | |
2775 | conf->recovery_disabled = mddev->recovery_disabled; | |
2776 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2777 | return 0; | |
2778 | } else | |
2779 | return min_bad; | |
2780 | ||
2781 | } | |
2782 | if (min_bad > 0 && min_bad < good_sectors) { | |
2783 | /* only resync enough to reach the next bad->good | |
2784 | * transition */ | |
2785 | good_sectors = min_bad; | |
2786 | } | |
2787 | ||
3e198f78 N |
2788 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2789 | /* extra read targets are also write targets */ | |
2790 | write_targets += read_targets-1; | |
2791 | ||
2792 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2793 | /* There is nowhere to write, so all non-sync |
2794 | * drives must be failed - so we are finished | |
2795 | */ | |
b7219ccb N |
2796 | sector_t rv; |
2797 | if (min_bad > 0) | |
2798 | max_sector = sector_nr + min_bad; | |
2799 | rv = max_sector - sector_nr; | |
57afd89f | 2800 | *skipped = 1; |
1da177e4 | 2801 | put_buf(r1_bio); |
1da177e4 LT |
2802 | return rv; |
2803 | } | |
2804 | ||
c6207277 N |
2805 | if (max_sector > mddev->resync_max) |
2806 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2807 | if (max_sector > sector_nr + good_sectors) |
2808 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2809 | nr_sectors = 0; |
289e99e8 | 2810 | sync_blocks = 0; |
1da177e4 LT |
2811 | do { |
2812 | struct page *page; | |
2813 | int len = PAGE_SIZE; | |
2814 | if (sector_nr + (len>>9) > max_sector) | |
2815 | len = (max_sector - sector_nr) << 9; | |
2816 | if (len == 0) | |
2817 | break; | |
6a806c51 N |
2818 | if (sync_blocks == 0) { |
2819 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
2820 | &sync_blocks, still_degraded) && |
2821 | !conf->fullsync && | |
2822 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2823 | break; |
7571ae88 | 2824 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2825 | len = sync_blocks<<9; |
ab7a30c7 | 2826 | } |
191ea9b2 | 2827 | |
8f19ccb2 | 2828 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
98d30c58 ML |
2829 | struct resync_pages *rp; |
2830 | ||
1da177e4 | 2831 | bio = r1_bio->bios[i]; |
98d30c58 | 2832 | rp = get_resync_pages(bio); |
1da177e4 | 2833 | if (bio->bi_end_io) { |
022e510f | 2834 | page = resync_fetch_page(rp, page_idx); |
c85ba149 ML |
2835 | |
2836 | /* | |
2837 | * won't fail because the vec table is big | |
2838 | * enough to hold all these pages | |
2839 | */ | |
2840 | bio_add_page(bio, page, len, 0); | |
1da177e4 LT |
2841 | } |
2842 | } | |
2843 | nr_sectors += len>>9; | |
2844 | sector_nr += len>>9; | |
191ea9b2 | 2845 | sync_blocks -= (len>>9); |
022e510f | 2846 | } while (++page_idx < RESYNC_PAGES); |
98d30c58 | 2847 | |
1da177e4 LT |
2848 | r1_bio->sectors = nr_sectors; |
2849 | ||
c40f341f GR |
2850 | if (mddev_is_clustered(mddev) && |
2851 | conf->cluster_sync_high < sector_nr + nr_sectors) { | |
2852 | conf->cluster_sync_low = mddev->curr_resync_completed; | |
2853 | conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; | |
2854 | /* Send resync message */ | |
2855 | md_cluster_ops->resync_info_update(mddev, | |
2856 | conf->cluster_sync_low, | |
2857 | conf->cluster_sync_high); | |
2858 | } | |
2859 | ||
d11c171e N |
2860 | /* For a user-requested sync, we read all readable devices and do a |
2861 | * compare | |
2862 | */ | |
2863 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2864 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2865 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2866 | bio = r1_bio->bios[i]; |
2867 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2868 | read_targets--; |
74d46992 | 2869 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2870 | if (read_targets == 1) |
2871 | bio->bi_opf &= ~MD_FAILFAST; | |
d11c171e N |
2872 | generic_make_request(bio); |
2873 | } | |
2874 | } | |
2875 | } else { | |
2876 | atomic_set(&r1_bio->remaining, 1); | |
2877 | bio = r1_bio->bios[r1_bio->read_disk]; | |
74d46992 | 2878 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2879 | if (read_targets == 1) |
2880 | bio->bi_opf &= ~MD_FAILFAST; | |
d11c171e | 2881 | generic_make_request(bio); |
1da177e4 | 2882 | |
d11c171e | 2883 | } |
1da177e4 LT |
2884 | return nr_sectors; |
2885 | } | |
2886 | ||
fd01b88c | 2887 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2888 | { |
2889 | if (sectors) | |
2890 | return sectors; | |
2891 | ||
2892 | return mddev->dev_sectors; | |
2893 | } | |
2894 | ||
e8096360 | 2895 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2896 | { |
e8096360 | 2897 | struct r1conf *conf; |
709ae487 | 2898 | int i; |
0eaf822c | 2899 | struct raid1_info *disk; |
3cb03002 | 2900 | struct md_rdev *rdev; |
709ae487 | 2901 | int err = -ENOMEM; |
1da177e4 | 2902 | |
e8096360 | 2903 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2904 | if (!conf) |
709ae487 | 2905 | goto abort; |
1da177e4 | 2906 | |
fd76863e | 2907 | conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, |
824e47da | 2908 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2909 | if (!conf->nr_pending) |
2910 | goto abort; | |
2911 | ||
2912 | conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2913 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2914 | if (!conf->nr_waiting) |
2915 | goto abort; | |
2916 | ||
2917 | conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2918 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2919 | if (!conf->nr_queued) |
2920 | goto abort; | |
2921 | ||
2922 | conf->barrier = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2923 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2924 | if (!conf->barrier) |
2925 | goto abort; | |
2926 | ||
0eaf822c | 2927 | conf->mirrors = kzalloc(sizeof(struct raid1_info) |
8f19ccb2 | 2928 | * mddev->raid_disks * 2, |
1da177e4 LT |
2929 | GFP_KERNEL); |
2930 | if (!conf->mirrors) | |
709ae487 | 2931 | goto abort; |
1da177e4 | 2932 | |
ddaf22ab N |
2933 | conf->tmppage = alloc_page(GFP_KERNEL); |
2934 | if (!conf->tmppage) | |
709ae487 | 2935 | goto abort; |
ddaf22ab | 2936 | |
709ae487 | 2937 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2938 | if (!conf->poolinfo) |
709ae487 | 2939 | goto abort; |
8f19ccb2 | 2940 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
1da177e4 LT |
2941 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, |
2942 | r1bio_pool_free, | |
2943 | conf->poolinfo); | |
2944 | if (!conf->r1bio_pool) | |
709ae487 N |
2945 | goto abort; |
2946 | ||
011067b0 | 2947 | conf->bio_split = bioset_create(BIO_POOL_SIZE, 0, 0); |
c230e7e5 N |
2948 | if (!conf->bio_split) |
2949 | goto abort; | |
2950 | ||
ed9bfdf1 | 2951 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2952 | |
c19d5798 | 2953 | err = -EINVAL; |
e7e72bf6 | 2954 | spin_lock_init(&conf->device_lock); |
dafb20fa | 2955 | rdev_for_each(rdev, mddev) { |
709ae487 | 2956 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2957 | if (disk_idx >= mddev->raid_disks |
2958 | || disk_idx < 0) | |
2959 | continue; | |
c19d5798 | 2960 | if (test_bit(Replacement, &rdev->flags)) |
02b898f2 | 2961 | disk = conf->mirrors + mddev->raid_disks + disk_idx; |
c19d5798 N |
2962 | else |
2963 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 2964 | |
c19d5798 N |
2965 | if (disk->rdev) |
2966 | goto abort; | |
1da177e4 | 2967 | disk->rdev = rdev; |
1da177e4 | 2968 | disk->head_position = 0; |
12cee5a8 | 2969 | disk->seq_start = MaxSector; |
1da177e4 LT |
2970 | } |
2971 | conf->raid_disks = mddev->raid_disks; | |
2972 | conf->mddev = mddev; | |
1da177e4 | 2973 | INIT_LIST_HEAD(&conf->retry_list); |
55ce74d4 | 2974 | INIT_LIST_HEAD(&conf->bio_end_io_list); |
1da177e4 LT |
2975 | |
2976 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2977 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2978 | |
191ea9b2 | 2979 | bio_list_init(&conf->pending_bio_list); |
34db0cd6 | 2980 | conf->pending_count = 0; |
d890fa2b | 2981 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 2982 | |
c19d5798 | 2983 | err = -EIO; |
8f19ccb2 | 2984 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2985 | |
2986 | disk = conf->mirrors + i; | |
2987 | ||
c19d5798 N |
2988 | if (i < conf->raid_disks && |
2989 | disk[conf->raid_disks].rdev) { | |
2990 | /* This slot has a replacement. */ | |
2991 | if (!disk->rdev) { | |
2992 | /* No original, just make the replacement | |
2993 | * a recovering spare | |
2994 | */ | |
2995 | disk->rdev = | |
2996 | disk[conf->raid_disks].rdev; | |
2997 | disk[conf->raid_disks].rdev = NULL; | |
2998 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
2999 | /* Original is not in_sync - bad */ | |
3000 | goto abort; | |
3001 | } | |
3002 | ||
5fd6c1dc N |
3003 | if (!disk->rdev || |
3004 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 3005 | disk->head_position = 0; |
4f0a5e01 JB |
3006 | if (disk->rdev && |
3007 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 3008 | conf->fullsync = 1; |
be4d3280 | 3009 | } |
1da177e4 | 3010 | } |
709ae487 | 3011 | |
709ae487 | 3012 | err = -ENOMEM; |
0232605d | 3013 | conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
1d41c216 | 3014 | if (!conf->thread) |
709ae487 | 3015 | goto abort; |
1da177e4 | 3016 | |
709ae487 N |
3017 | return conf; |
3018 | ||
3019 | abort: | |
3020 | if (conf) { | |
644df1a8 | 3021 | mempool_destroy(conf->r1bio_pool); |
709ae487 N |
3022 | kfree(conf->mirrors); |
3023 | safe_put_page(conf->tmppage); | |
3024 | kfree(conf->poolinfo); | |
fd76863e | 3025 | kfree(conf->nr_pending); |
3026 | kfree(conf->nr_waiting); | |
3027 | kfree(conf->nr_queued); | |
3028 | kfree(conf->barrier); | |
c230e7e5 N |
3029 | if (conf->bio_split) |
3030 | bioset_free(conf->bio_split); | |
709ae487 N |
3031 | kfree(conf); |
3032 | } | |
3033 | return ERR_PTR(err); | |
3034 | } | |
3035 | ||
afa0f557 | 3036 | static void raid1_free(struct mddev *mddev, void *priv); |
849674e4 | 3037 | static int raid1_run(struct mddev *mddev) |
709ae487 | 3038 | { |
e8096360 | 3039 | struct r1conf *conf; |
709ae487 | 3040 | int i; |
3cb03002 | 3041 | struct md_rdev *rdev; |
5220ea1e | 3042 | int ret; |
2ff8cc2c | 3043 | bool discard_supported = false; |
709ae487 N |
3044 | |
3045 | if (mddev->level != 1) { | |
1d41c216 N |
3046 | pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", |
3047 | mdname(mddev), mddev->level); | |
709ae487 N |
3048 | return -EIO; |
3049 | } | |
3050 | if (mddev->reshape_position != MaxSector) { | |
1d41c216 N |
3051 | pr_warn("md/raid1:%s: reshape_position set but not supported\n", |
3052 | mdname(mddev)); | |
709ae487 N |
3053 | return -EIO; |
3054 | } | |
a415c0f1 N |
3055 | if (mddev_init_writes_pending(mddev) < 0) |
3056 | return -ENOMEM; | |
1da177e4 | 3057 | /* |
709ae487 N |
3058 | * copy the already verified devices into our private RAID1 |
3059 | * bookkeeping area. [whatever we allocate in run(), | |
afa0f557 | 3060 | * should be freed in raid1_free()] |
1da177e4 | 3061 | */ |
709ae487 N |
3062 | if (mddev->private == NULL) |
3063 | conf = setup_conf(mddev); | |
3064 | else | |
3065 | conf = mddev->private; | |
1da177e4 | 3066 | |
709ae487 N |
3067 | if (IS_ERR(conf)) |
3068 | return PTR_ERR(conf); | |
1da177e4 | 3069 | |
3deff1a7 | 3070 | if (mddev->queue) { |
5026d7a9 | 3071 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
3deff1a7 CH |
3072 | blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
3073 | } | |
5026d7a9 | 3074 | |
dafb20fa | 3075 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
3076 | if (!mddev->gendisk) |
3077 | continue; | |
709ae487 N |
3078 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
3079 | rdev->data_offset << 9); | |
2ff8cc2c SL |
3080 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
3081 | discard_supported = true; | |
1da177e4 | 3082 | } |
191ea9b2 | 3083 | |
709ae487 N |
3084 | mddev->degraded = 0; |
3085 | for (i=0; i < conf->raid_disks; i++) | |
3086 | if (conf->mirrors[i].rdev == NULL || | |
3087 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
3088 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
3089 | mddev->degraded++; | |
3090 | ||
3091 | if (conf->raid_disks - mddev->degraded == 1) | |
3092 | mddev->recovery_cp = MaxSector; | |
3093 | ||
8c6ac868 | 3094 | if (mddev->recovery_cp != MaxSector) |
1d41c216 N |
3095 | pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", |
3096 | mdname(mddev)); | |
3097 | pr_info("md/raid1:%s: active with %d out of %d mirrors\n", | |
f72ffdd6 | 3098 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
1da177e4 | 3099 | mddev->raid_disks); |
709ae487 | 3100 | |
1da177e4 LT |
3101 | /* |
3102 | * Ok, everything is just fine now | |
3103 | */ | |
709ae487 N |
3104 | mddev->thread = conf->thread; |
3105 | conf->thread = NULL; | |
3106 | mddev->private = conf; | |
46533ff7 | 3107 | set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); |
709ae487 | 3108 | |
1f403624 | 3109 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 3110 | |
1ed7242e | 3111 | if (mddev->queue) { |
2ff8cc2c | 3112 | if (discard_supported) |
8b904b5b | 3113 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, |
2ff8cc2c SL |
3114 | mddev->queue); |
3115 | else | |
8b904b5b | 3116 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, |
2ff8cc2c | 3117 | mddev->queue); |
1ed7242e | 3118 | } |
5220ea1e | 3119 | |
3120 | ret = md_integrity_register(mddev); | |
5aa61f42 N |
3121 | if (ret) { |
3122 | md_unregister_thread(&mddev->thread); | |
afa0f557 | 3123 | raid1_free(mddev, conf); |
5aa61f42 | 3124 | } |
5220ea1e | 3125 | return ret; |
1da177e4 LT |
3126 | } |
3127 | ||
afa0f557 | 3128 | static void raid1_free(struct mddev *mddev, void *priv) |
1da177e4 | 3129 | { |
afa0f557 | 3130 | struct r1conf *conf = priv; |
409c57f3 | 3131 | |
644df1a8 | 3132 | mempool_destroy(conf->r1bio_pool); |
990a8baf | 3133 | kfree(conf->mirrors); |
0fea7ed8 | 3134 | safe_put_page(conf->tmppage); |
990a8baf | 3135 | kfree(conf->poolinfo); |
fd76863e | 3136 | kfree(conf->nr_pending); |
3137 | kfree(conf->nr_waiting); | |
3138 | kfree(conf->nr_queued); | |
3139 | kfree(conf->barrier); | |
c230e7e5 N |
3140 | if (conf->bio_split) |
3141 | bioset_free(conf->bio_split); | |
1da177e4 | 3142 | kfree(conf); |
1da177e4 LT |
3143 | } |
3144 | ||
fd01b88c | 3145 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
3146 | { |
3147 | /* no resync is happening, and there is enough space | |
3148 | * on all devices, so we can resize. | |
3149 | * We need to make sure resync covers any new space. | |
3150 | * If the array is shrinking we should possibly wait until | |
3151 | * any io in the removed space completes, but it hardly seems | |
3152 | * worth it. | |
3153 | */ | |
a4a6125a N |
3154 | sector_t newsize = raid1_size(mddev, sectors, 0); |
3155 | if (mddev->external_size && | |
3156 | mddev->array_sectors > newsize) | |
b522adcd | 3157 | return -EINVAL; |
a4a6125a N |
3158 | if (mddev->bitmap) { |
3159 | int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); | |
3160 | if (ret) | |
3161 | return ret; | |
3162 | } | |
3163 | md_set_array_sectors(mddev, newsize); | |
b522adcd | 3164 | if (sectors > mddev->dev_sectors && |
b098636c | 3165 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 3166 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
3167 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3168 | } | |
b522adcd | 3169 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 3170 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
3171 | return 0; |
3172 | } | |
3173 | ||
fd01b88c | 3174 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
3175 | { |
3176 | /* We need to: | |
3177 | * 1/ resize the r1bio_pool | |
3178 | * 2/ resize conf->mirrors | |
3179 | * | |
3180 | * We allocate a new r1bio_pool if we can. | |
3181 | * Then raise a device barrier and wait until all IO stops. | |
3182 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
3183 | * |
3184 | * At the same time, we "pack" the devices so that all the missing | |
3185 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
3186 | */ |
3187 | mempool_t *newpool, *oldpool; | |
3188 | struct pool_info *newpoolinfo; | |
0eaf822c | 3189 | struct raid1_info *newmirrors; |
e8096360 | 3190 | struct r1conf *conf = mddev->private; |
63c70c4f | 3191 | int cnt, raid_disks; |
c04be0aa | 3192 | unsigned long flags; |
2214c260 | 3193 | int d, d2; |
1da177e4 | 3194 | |
63c70c4f | 3195 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 3196 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
3197 | mddev->layout != mddev->new_layout || |
3198 | mddev->level != mddev->new_level) { | |
664e7c41 | 3199 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
3200 | mddev->new_layout = mddev->layout; |
3201 | mddev->new_level = mddev->level; | |
3202 | return -EINVAL; | |
3203 | } | |
3204 | ||
2214c260 AP |
3205 | if (!mddev_is_clustered(mddev)) |
3206 | md_allow_write(mddev); | |
2a2275d6 | 3207 | |
63c70c4f N |
3208 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
3209 | ||
6ea9c07c N |
3210 | if (raid_disks < conf->raid_disks) { |
3211 | cnt=0; | |
3212 | for (d= 0; d < conf->raid_disks; d++) | |
3213 | if (conf->mirrors[d].rdev) | |
3214 | cnt++; | |
3215 | if (cnt > raid_disks) | |
1da177e4 | 3216 | return -EBUSY; |
6ea9c07c | 3217 | } |
1da177e4 LT |
3218 | |
3219 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
3220 | if (!newpoolinfo) | |
3221 | return -ENOMEM; | |
3222 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 3223 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 LT |
3224 | |
3225 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
3226 | r1bio_pool_free, newpoolinfo); | |
3227 | if (!newpool) { | |
3228 | kfree(newpoolinfo); | |
3229 | return -ENOMEM; | |
3230 | } | |
0eaf822c | 3231 | newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, |
8f19ccb2 | 3232 | GFP_KERNEL); |
1da177e4 LT |
3233 | if (!newmirrors) { |
3234 | kfree(newpoolinfo); | |
3235 | mempool_destroy(newpool); | |
3236 | return -ENOMEM; | |
3237 | } | |
1da177e4 | 3238 | |
e2d59925 | 3239 | freeze_array(conf, 0); |
1da177e4 LT |
3240 | |
3241 | /* ok, everything is stopped */ | |
3242 | oldpool = conf->r1bio_pool; | |
3243 | conf->r1bio_pool = newpool; | |
6ea9c07c | 3244 | |
a88aa786 | 3245 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 3246 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 3247 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 3248 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 3249 | rdev->raid_disk = d2; |
36fad858 NK |
3250 | sysfs_unlink_rdev(mddev, rdev); |
3251 | if (sysfs_link_rdev(mddev, rdev)) | |
1d41c216 N |
3252 | pr_warn("md/raid1:%s: cannot register rd%d\n", |
3253 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 3254 | } |
a88aa786 N |
3255 | if (rdev) |
3256 | newmirrors[d2++].rdev = rdev; | |
3257 | } | |
1da177e4 LT |
3258 | kfree(conf->mirrors); |
3259 | conf->mirrors = newmirrors; | |
3260 | kfree(conf->poolinfo); | |
3261 | conf->poolinfo = newpoolinfo; | |
3262 | ||
c04be0aa | 3263 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 3264 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 3265 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 3266 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 3267 | mddev->delta_disks = 0; |
1da177e4 | 3268 | |
e2d59925 | 3269 | unfreeze_array(conf); |
1da177e4 | 3270 | |
985ca973 | 3271 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
1da177e4 LT |
3272 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3273 | md_wakeup_thread(mddev->thread); | |
3274 | ||
3275 | mempool_destroy(oldpool); | |
3276 | return 0; | |
3277 | } | |
3278 | ||
b03e0ccb | 3279 | static void raid1_quiesce(struct mddev *mddev, int quiesce) |
36fa3063 | 3280 | { |
e8096360 | 3281 | struct r1conf *conf = mddev->private; |
36fa3063 | 3282 | |
b03e0ccb | 3283 | if (quiesce) |
07169fd4 | 3284 | freeze_array(conf, 0); |
b03e0ccb | 3285 | else |
07169fd4 | 3286 | unfreeze_array(conf); |
36fa3063 N |
3287 | } |
3288 | ||
fd01b88c | 3289 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
3290 | { |
3291 | /* raid1 can take over: | |
3292 | * raid5 with 2 devices, any layout or chunk size | |
3293 | */ | |
3294 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 3295 | struct r1conf *conf; |
709ae487 N |
3296 | mddev->new_level = 1; |
3297 | mddev->new_layout = 0; | |
3298 | mddev->new_chunk_sectors = 0; | |
3299 | conf = setup_conf(mddev); | |
6995f0b2 | 3300 | if (!IS_ERR(conf)) { |
07169fd4 | 3301 | /* Array must appear to be quiesced */ |
3302 | conf->array_frozen = 1; | |
394ed8e4 SL |
3303 | mddev_clear_unsupported_flags(mddev, |
3304 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 3305 | } |
709ae487 N |
3306 | return conf; |
3307 | } | |
3308 | return ERR_PTR(-EINVAL); | |
3309 | } | |
1da177e4 | 3310 | |
84fc4b56 | 3311 | static struct md_personality raid1_personality = |
1da177e4 LT |
3312 | { |
3313 | .name = "raid1", | |
2604b703 | 3314 | .level = 1, |
1da177e4 | 3315 | .owner = THIS_MODULE, |
849674e4 SL |
3316 | .make_request = raid1_make_request, |
3317 | .run = raid1_run, | |
afa0f557 | 3318 | .free = raid1_free, |
849674e4 SL |
3319 | .status = raid1_status, |
3320 | .error_handler = raid1_error, | |
1da177e4 LT |
3321 | .hot_add_disk = raid1_add_disk, |
3322 | .hot_remove_disk= raid1_remove_disk, | |
3323 | .spare_active = raid1_spare_active, | |
849674e4 | 3324 | .sync_request = raid1_sync_request, |
1da177e4 | 3325 | .resize = raid1_resize, |
80c3a6ce | 3326 | .size = raid1_size, |
63c70c4f | 3327 | .check_reshape = raid1_reshape, |
36fa3063 | 3328 | .quiesce = raid1_quiesce, |
709ae487 | 3329 | .takeover = raid1_takeover, |
5c675f83 | 3330 | .congested = raid1_congested, |
1da177e4 LT |
3331 | }; |
3332 | ||
3333 | static int __init raid_init(void) | |
3334 | { | |
2604b703 | 3335 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
3336 | } |
3337 | ||
3338 | static void raid_exit(void) | |
3339 | { | |
2604b703 | 3340 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
3341 | } |
3342 | ||
3343 | module_init(raid_init); | |
3344 | module_exit(raid_exit); | |
3345 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3346 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 3347 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 3348 | MODULE_ALIAS("md-raid1"); |
2604b703 | 3349 | MODULE_ALIAS("md-level-1"); |
34db0cd6 N |
3350 | |
3351 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |