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1da177e4 LT |
1 | /* |
2 | * raid1.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat | |
5 | * | |
6 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
7 | * | |
8 | * RAID-1 management functions. | |
9 | * | |
10 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 | |
11 | * | |
96de0e25 | 12 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
1da177e4 LT |
13 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
14 | * | |
191ea9b2 N |
15 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
16 | * bitmapped intelligence in resync: | |
17 | * | |
18 | * - bitmap marked during normal i/o | |
19 | * - bitmap used to skip nondirty blocks during sync | |
20 | * | |
21 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: | |
22 | * - persistent bitmap code | |
23 | * | |
1da177e4 LT |
24 | * This program is free software; you can redistribute it and/or modify |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2, or (at your option) | |
27 | * any later version. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
31 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
25570727 | 35 | #include <linux/delay.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
056075c7 | 37 | #include <linux/module.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
8bda470e | 39 | #include <linux/ratelimit.h> |
3f07c014 IM |
40 | #include <linux/sched/signal.h> |
41 | ||
109e3765 | 42 | #include <trace/events/block.h> |
3f07c014 | 43 | |
43b2e5d8 | 44 | #include "md.h" |
ef740c37 | 45 | #include "raid1.h" |
935fe098 | 46 | #include "md-bitmap.h" |
191ea9b2 | 47 | |
394ed8e4 SL |
48 | #define UNSUPPORTED_MDDEV_FLAGS \ |
49 | ((1L << MD_HAS_JOURNAL) | \ | |
ea0213e0 | 50 | (1L << MD_JOURNAL_CLEAN) | \ |
ddc08823 PB |
51 | (1L << MD_HAS_PPL) | \ |
52 | (1L << MD_HAS_MULTIPLE_PPLS)) | |
394ed8e4 | 53 | |
1da177e4 LT |
54 | /* |
55 | * Number of guaranteed r1bios in case of extreme VM load: | |
56 | */ | |
57 | #define NR_RAID1_BIOS 256 | |
58 | ||
473e87ce JB |
59 | /* when we get a read error on a read-only array, we redirect to another |
60 | * device without failing the first device, or trying to over-write to | |
61 | * correct the read error. To keep track of bad blocks on a per-bio | |
62 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer | |
63 | */ | |
64 | #define IO_BLOCKED ((struct bio *)1) | |
65 | /* When we successfully write to a known bad-block, we need to remove the | |
66 | * bad-block marking which must be done from process context. So we record | |
67 | * the success by setting devs[n].bio to IO_MADE_GOOD | |
68 | */ | |
69 | #define IO_MADE_GOOD ((struct bio *)2) | |
70 | ||
71 | #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) | |
72 | ||
34db0cd6 N |
73 | /* When there are this many requests queue to be written by |
74 | * the raid1 thread, we become 'congested' to provide back-pressure | |
75 | * for writeback. | |
76 | */ | |
77 | static int max_queued_requests = 1024; | |
1da177e4 | 78 | |
fd76863e | 79 | static void allow_barrier(struct r1conf *conf, sector_t sector_nr); |
80 | static void lower_barrier(struct r1conf *conf, sector_t sector_nr); | |
1da177e4 | 81 | |
578b54ad N |
82 | #define raid1_log(md, fmt, args...) \ |
83 | do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0) | |
84 | ||
fb0eb5df ML |
85 | #include "raid1-10.c" |
86 | ||
98d30c58 ML |
87 | /* |
88 | * for resync bio, r1bio pointer can be retrieved from the per-bio | |
89 | * 'struct resync_pages'. | |
90 | */ | |
91 | static inline struct r1bio *get_resync_r1bio(struct bio *bio) | |
92 | { | |
93 | return get_resync_pages(bio)->raid_bio; | |
94 | } | |
95 | ||
dd0fc66f | 96 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
97 | { |
98 | struct pool_info *pi = data; | |
9f2c9d12 | 99 | int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
1da177e4 LT |
100 | |
101 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 102 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
103 | } |
104 | ||
105 | static void r1bio_pool_free(void *r1_bio, void *data) | |
106 | { | |
107 | kfree(r1_bio); | |
108 | } | |
109 | ||
8e005f7c | 110 | #define RESYNC_DEPTH 32 |
1da177e4 | 111 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) |
8e005f7c | 112 | #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) |
113 | #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) | |
c40f341f GR |
114 | #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) |
115 | #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) | |
1da177e4 | 116 | |
dd0fc66f | 117 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
118 | { |
119 | struct pool_info *pi = data; | |
9f2c9d12 | 120 | struct r1bio *r1_bio; |
1da177e4 | 121 | struct bio *bio; |
da1aab3d | 122 | int need_pages; |
98d30c58 ML |
123 | int j; |
124 | struct resync_pages *rps; | |
1da177e4 LT |
125 | |
126 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 127 | if (!r1_bio) |
1da177e4 | 128 | return NULL; |
1da177e4 | 129 | |
98d30c58 ML |
130 | rps = kmalloc(sizeof(struct resync_pages) * pi->raid_disks, |
131 | gfp_flags); | |
132 | if (!rps) | |
133 | goto out_free_r1bio; | |
134 | ||
1da177e4 LT |
135 | /* |
136 | * Allocate bios : 1 for reading, n-1 for writing | |
137 | */ | |
138 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 139 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
140 | if (!bio) |
141 | goto out_free_bio; | |
142 | r1_bio->bios[j] = bio; | |
143 | } | |
144 | /* | |
145 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
146 | * the first bio. |
147 | * If this is a user-requested check/repair, allocate | |
148 | * RESYNC_PAGES for each bio. | |
1da177e4 | 149 | */ |
d11c171e | 150 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
da1aab3d | 151 | need_pages = pi->raid_disks; |
d11c171e | 152 | else |
da1aab3d | 153 | need_pages = 1; |
98d30c58 ML |
154 | for (j = 0; j < pi->raid_disks; j++) { |
155 | struct resync_pages *rp = &rps[j]; | |
156 | ||
d11c171e | 157 | bio = r1_bio->bios[j]; |
d11c171e | 158 | |
98d30c58 ML |
159 | if (j < need_pages) { |
160 | if (resync_alloc_pages(rp, gfp_flags)) | |
161 | goto out_free_pages; | |
162 | } else { | |
163 | memcpy(rp, &rps[0], sizeof(*rp)); | |
164 | resync_get_all_pages(rp); | |
165 | } | |
166 | ||
98d30c58 ML |
167 | rp->raid_bio = r1_bio; |
168 | bio->bi_private = rp; | |
1da177e4 LT |
169 | } |
170 | ||
171 | r1_bio->master_bio = NULL; | |
172 | ||
173 | return r1_bio; | |
174 | ||
da1aab3d | 175 | out_free_pages: |
491221f8 | 176 | while (--j >= 0) |
98d30c58 | 177 | resync_free_pages(&rps[j]); |
da1aab3d | 178 | |
1da177e4 | 179 | out_free_bio: |
8f19ccb2 | 180 | while (++j < pi->raid_disks) |
1da177e4 | 181 | bio_put(r1_bio->bios[j]); |
98d30c58 ML |
182 | kfree(rps); |
183 | ||
184 | out_free_r1bio: | |
1da177e4 LT |
185 | r1bio_pool_free(r1_bio, data); |
186 | return NULL; | |
187 | } | |
188 | ||
189 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
190 | { | |
191 | struct pool_info *pi = data; | |
98d30c58 | 192 | int i; |
9f2c9d12 | 193 | struct r1bio *r1bio = __r1_bio; |
98d30c58 | 194 | struct resync_pages *rp = NULL; |
1da177e4 | 195 | |
98d30c58 ML |
196 | for (i = pi->raid_disks; i--; ) { |
197 | rp = get_resync_pages(r1bio->bios[i]); | |
198 | resync_free_pages(rp); | |
1da177e4 | 199 | bio_put(r1bio->bios[i]); |
98d30c58 ML |
200 | } |
201 | ||
202 | /* resync pages array stored in the 1st bio's .bi_private */ | |
203 | kfree(rp); | |
1da177e4 LT |
204 | |
205 | r1bio_pool_free(r1bio, data); | |
206 | } | |
207 | ||
e8096360 | 208 | static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
1da177e4 LT |
209 | { |
210 | int i; | |
211 | ||
8f19ccb2 | 212 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 | 213 | struct bio **bio = r1_bio->bios + i; |
4367af55 | 214 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
215 | bio_put(*bio); |
216 | *bio = NULL; | |
217 | } | |
218 | } | |
219 | ||
9f2c9d12 | 220 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 221 | { |
e8096360 | 222 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 223 | |
1da177e4 LT |
224 | put_all_bios(conf, r1_bio); |
225 | mempool_free(r1_bio, conf->r1bio_pool); | |
226 | } | |
227 | ||
9f2c9d12 | 228 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 229 | { |
e8096360 | 230 | struct r1conf *conf = r1_bio->mddev->private; |
af5f42a7 | 231 | sector_t sect = r1_bio->sector; |
3e198f78 N |
232 | int i; |
233 | ||
8f19ccb2 | 234 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3e198f78 N |
235 | struct bio *bio = r1_bio->bios[i]; |
236 | if (bio->bi_end_io) | |
237 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
238 | } | |
1da177e4 LT |
239 | |
240 | mempool_free(r1_bio, conf->r1buf_pool); | |
241 | ||
af5f42a7 | 242 | lower_barrier(conf, sect); |
1da177e4 LT |
243 | } |
244 | ||
9f2c9d12 | 245 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
246 | { |
247 | unsigned long flags; | |
fd01b88c | 248 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 249 | struct r1conf *conf = mddev->private; |
fd76863e | 250 | int idx; |
1da177e4 | 251 | |
fd76863e | 252 | idx = sector_to_idx(r1_bio->sector); |
1da177e4 LT |
253 | spin_lock_irqsave(&conf->device_lock, flags); |
254 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
824e47da | 255 | atomic_inc(&conf->nr_queued[idx]); |
1da177e4 LT |
256 | spin_unlock_irqrestore(&conf->device_lock, flags); |
257 | ||
17999be4 | 258 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
259 | md_wakeup_thread(mddev->thread); |
260 | } | |
261 | ||
262 | /* | |
263 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
264 | * operation and are ready to return a success/failure code to the buffer | |
265 | * cache layer. | |
266 | */ | |
9f2c9d12 | 267 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
268 | { |
269 | struct bio *bio = r1_bio->master_bio; | |
e8096360 | 270 | struct r1conf *conf = r1_bio->mddev->private; |
d2eb35ac N |
271 | |
272 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
4e4cbee9 | 273 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 | 274 | |
37011e3a N |
275 | bio_endio(bio); |
276 | /* | |
277 | * Wake up any possible resync thread that waits for the device | |
278 | * to go idle. | |
279 | */ | |
280 | allow_barrier(conf, r1_bio->sector); | |
d2eb35ac N |
281 | } |
282 | ||
9f2c9d12 | 283 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
284 | { |
285 | struct bio *bio = r1_bio->master_bio; | |
286 | ||
4b6d287f N |
287 | /* if nobody has done the final endio yet, do it now */ |
288 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
289 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
290 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
4f024f37 KO |
291 | (unsigned long long) bio->bi_iter.bi_sector, |
292 | (unsigned long long) bio_end_sector(bio) - 1); | |
4b6d287f | 293 | |
d2eb35ac | 294 | call_bio_endio(r1_bio); |
4b6d287f | 295 | } |
1da177e4 LT |
296 | free_r1bio(r1_bio); |
297 | } | |
298 | ||
299 | /* | |
300 | * Update disk head position estimator based on IRQ completion info. | |
301 | */ | |
9f2c9d12 | 302 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 303 | { |
e8096360 | 304 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
305 | |
306 | conf->mirrors[disk].head_position = | |
307 | r1_bio->sector + (r1_bio->sectors); | |
308 | } | |
309 | ||
ba3ae3be NK |
310 | /* |
311 | * Find the disk number which triggered given bio | |
312 | */ | |
9f2c9d12 | 313 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
314 | { |
315 | int mirror; | |
30194636 N |
316 | struct r1conf *conf = r1_bio->mddev->private; |
317 | int raid_disks = conf->raid_disks; | |
ba3ae3be | 318 | |
8f19ccb2 | 319 | for (mirror = 0; mirror < raid_disks * 2; mirror++) |
ba3ae3be NK |
320 | if (r1_bio->bios[mirror] == bio) |
321 | break; | |
322 | ||
8f19ccb2 | 323 | BUG_ON(mirror == raid_disks * 2); |
ba3ae3be NK |
324 | update_head_pos(mirror, r1_bio); |
325 | ||
326 | return mirror; | |
327 | } | |
328 | ||
4246a0b6 | 329 | static void raid1_end_read_request(struct bio *bio) |
1da177e4 | 330 | { |
4e4cbee9 | 331 | int uptodate = !bio->bi_status; |
9f2c9d12 | 332 | struct r1bio *r1_bio = bio->bi_private; |
e8096360 | 333 | struct r1conf *conf = r1_bio->mddev->private; |
e5872d58 | 334 | struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; |
1da177e4 | 335 | |
1da177e4 LT |
336 | /* |
337 | * this branch is our 'one mirror IO has finished' event handler: | |
338 | */ | |
e5872d58 | 339 | update_head_pos(r1_bio->read_disk, r1_bio); |
ddaf22ab | 340 | |
dd00a99e N |
341 | if (uptodate) |
342 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
2e52d449 N |
343 | else if (test_bit(FailFast, &rdev->flags) && |
344 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
345 | /* This was a fail-fast read so we definitely | |
346 | * want to retry */ | |
347 | ; | |
dd00a99e N |
348 | else { |
349 | /* If all other devices have failed, we want to return | |
350 | * the error upwards rather than fail the last device. | |
351 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 352 | */ |
dd00a99e N |
353 | unsigned long flags; |
354 | spin_lock_irqsave(&conf->device_lock, flags); | |
355 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
356 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
e5872d58 | 357 | test_bit(In_sync, &rdev->flags))) |
dd00a99e N |
358 | uptodate = 1; |
359 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
360 | } | |
1da177e4 | 361 | |
7ad4d4a6 | 362 | if (uptodate) { |
1da177e4 | 363 | raid_end_bio_io(r1_bio); |
e5872d58 | 364 | rdev_dec_pending(rdev, conf->mddev); |
7ad4d4a6 | 365 | } else { |
1da177e4 LT |
366 | /* |
367 | * oops, read error: | |
368 | */ | |
369 | char b[BDEVNAME_SIZE]; | |
1d41c216 N |
370 | pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", |
371 | mdname(conf->mddev), | |
372 | bdevname(rdev->bdev, b), | |
373 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 374 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 | 375 | reschedule_retry(r1_bio); |
7ad4d4a6 | 376 | /* don't drop the reference on read_disk yet */ |
1da177e4 | 377 | } |
1da177e4 LT |
378 | } |
379 | ||
9f2c9d12 | 380 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
381 | { |
382 | /* it really is the end of this request */ | |
383 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
841c1316 ML |
384 | bio_free_pages(r1_bio->behind_master_bio); |
385 | bio_put(r1_bio->behind_master_bio); | |
386 | r1_bio->behind_master_bio = NULL; | |
cd5ff9a1 N |
387 | } |
388 | /* clear the bitmap if all writes complete successfully */ | |
389 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
390 | r1_bio->sectors, | |
391 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
392 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
393 | md_write_end(r1_bio->mddev); | |
394 | } | |
395 | ||
9f2c9d12 | 396 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 397 | { |
cd5ff9a1 N |
398 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
399 | return; | |
400 | ||
401 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
402 | reschedule_retry(r1_bio); | |
403 | else { | |
404 | close_write(r1_bio); | |
4367af55 N |
405 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
406 | reschedule_retry(r1_bio); | |
407 | else | |
408 | raid_end_bio_io(r1_bio); | |
4e78064f N |
409 | } |
410 | } | |
411 | ||
4246a0b6 | 412 | static void raid1_end_write_request(struct bio *bio) |
1da177e4 | 413 | { |
9f2c9d12 | 414 | struct r1bio *r1_bio = bio->bi_private; |
e5872d58 | 415 | int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 416 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 417 | struct bio *to_put = NULL; |
e5872d58 N |
418 | int mirror = find_bio_disk(r1_bio, bio); |
419 | struct md_rdev *rdev = conf->mirrors[mirror].rdev; | |
e3f948cd SL |
420 | bool discard_error; |
421 | ||
4e4cbee9 | 422 | discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; |
1da177e4 | 423 | |
e9c7469b TH |
424 | /* |
425 | * 'one mirror IO has finished' event handler: | |
426 | */ | |
4e4cbee9 | 427 | if (bio->bi_status && !discard_error) { |
e5872d58 N |
428 | set_bit(WriteErrorSeen, &rdev->flags); |
429 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
430 | set_bit(MD_RECOVERY_NEEDED, & |
431 | conf->mddev->recovery); | |
432 | ||
212e7eb7 N |
433 | if (test_bit(FailFast, &rdev->flags) && |
434 | (bio->bi_opf & MD_FAILFAST) && | |
435 | /* We never try FailFast to WriteMostly devices */ | |
436 | !test_bit(WriteMostly, &rdev->flags)) { | |
437 | md_error(r1_bio->mddev, rdev); | |
438 | if (!test_bit(Faulty, &rdev->flags)) | |
439 | /* This is the only remaining device, | |
440 | * We need to retry the write without | |
441 | * FailFast | |
442 | */ | |
443 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
444 | else { | |
445 | /* Finished with this branch */ | |
446 | r1_bio->bios[mirror] = NULL; | |
447 | to_put = bio; | |
448 | } | |
449 | } else | |
450 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 | 451 | } else { |
1da177e4 | 452 | /* |
e9c7469b TH |
453 | * Set R1BIO_Uptodate in our master bio, so that we |
454 | * will return a good error code for to the higher | |
455 | * levels even if IO on some other mirrored buffer | |
456 | * fails. | |
457 | * | |
458 | * The 'master' represents the composite IO operation | |
459 | * to user-side. So if something waits for IO, then it | |
460 | * will wait for the 'master' bio. | |
1da177e4 | 461 | */ |
4367af55 N |
462 | sector_t first_bad; |
463 | int bad_sectors; | |
464 | ||
cd5ff9a1 N |
465 | r1_bio->bios[mirror] = NULL; |
466 | to_put = bio; | |
3056e3ae AL |
467 | /* |
468 | * Do not set R1BIO_Uptodate if the current device is | |
469 | * rebuilding or Faulty. This is because we cannot use | |
470 | * such device for properly reading the data back (we could | |
471 | * potentially use it, if the current write would have felt | |
472 | * before rdev->recovery_offset, but for simplicity we don't | |
473 | * check this here. | |
474 | */ | |
e5872d58 N |
475 | if (test_bit(In_sync, &rdev->flags) && |
476 | !test_bit(Faulty, &rdev->flags)) | |
3056e3ae | 477 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
e9c7469b | 478 | |
4367af55 | 479 | /* Maybe we can clear some bad blocks. */ |
e5872d58 | 480 | if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
e3f948cd | 481 | &first_bad, &bad_sectors) && !discard_error) { |
4367af55 N |
482 | r1_bio->bios[mirror] = IO_MADE_GOOD; |
483 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
484 | } | |
485 | } | |
486 | ||
e9c7469b | 487 | if (behind) { |
e5872d58 | 488 | if (test_bit(WriteMostly, &rdev->flags)) |
e9c7469b TH |
489 | atomic_dec(&r1_bio->behind_remaining); |
490 | ||
491 | /* | |
492 | * In behind mode, we ACK the master bio once the I/O | |
493 | * has safely reached all non-writemostly | |
494 | * disks. Setting the Returned bit ensures that this | |
495 | * gets done only once -- we don't ever want to return | |
496 | * -EIO here, instead we'll wait | |
497 | */ | |
498 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
499 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
500 | /* Maybe we can return now */ | |
501 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
502 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
503 | pr_debug("raid1: behind end write sectors" |
504 | " %llu-%llu\n", | |
4f024f37 KO |
505 | (unsigned long long) mbio->bi_iter.bi_sector, |
506 | (unsigned long long) bio_end_sector(mbio) - 1); | |
d2eb35ac | 507 | call_bio_endio(r1_bio); |
4b6d287f N |
508 | } |
509 | } | |
510 | } | |
4367af55 | 511 | if (r1_bio->bios[mirror] == NULL) |
e5872d58 | 512 | rdev_dec_pending(rdev, conf->mddev); |
e9c7469b | 513 | |
1da177e4 | 514 | /* |
1da177e4 LT |
515 | * Let's see if all mirrored write operations have finished |
516 | * already. | |
517 | */ | |
af6d7b76 | 518 | r1_bio_write_done(r1_bio); |
c70810b3 | 519 | |
04b857f7 N |
520 | if (to_put) |
521 | bio_put(to_put); | |
1da177e4 LT |
522 | } |
523 | ||
fd76863e | 524 | static sector_t align_to_barrier_unit_end(sector_t start_sector, |
525 | sector_t sectors) | |
526 | { | |
527 | sector_t len; | |
528 | ||
529 | WARN_ON(sectors == 0); | |
530 | /* | |
531 | * len is the number of sectors from start_sector to end of the | |
532 | * barrier unit which start_sector belongs to. | |
533 | */ | |
534 | len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - | |
535 | start_sector; | |
536 | ||
537 | if (len > sectors) | |
538 | len = sectors; | |
539 | ||
540 | return len; | |
541 | } | |
542 | ||
1da177e4 LT |
543 | /* |
544 | * This routine returns the disk from which the requested read should | |
545 | * be done. There is a per-array 'next expected sequential IO' sector | |
546 | * number - if this matches on the next IO then we use the last disk. | |
547 | * There is also a per-disk 'last know head position' sector that is | |
548 | * maintained from IRQ contexts, both the normal and the resync IO | |
549 | * completion handlers update this position correctly. If there is no | |
550 | * perfect sequential match then we pick the disk whose head is closest. | |
551 | * | |
552 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
553 | * because position is mirror, not device based. | |
554 | * | |
555 | * The rdev for the device selected will have nr_pending incremented. | |
556 | */ | |
e8096360 | 557 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 558 | { |
af3a2cd6 | 559 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
560 | int sectors; |
561 | int best_good_sectors; | |
9dedf603 SL |
562 | int best_disk, best_dist_disk, best_pending_disk; |
563 | int has_nonrot_disk; | |
be4d3280 | 564 | int disk; |
76073054 | 565 | sector_t best_dist; |
9dedf603 | 566 | unsigned int min_pending; |
3cb03002 | 567 | struct md_rdev *rdev; |
f3ac8bf7 | 568 | int choose_first; |
12cee5a8 | 569 | int choose_next_idle; |
1da177e4 LT |
570 | |
571 | rcu_read_lock(); | |
572 | /* | |
8ddf9efe | 573 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
574 | * device if no resync is going on, or below the resync window. |
575 | * We take the first readable disk when above the resync window. | |
576 | */ | |
577 | retry: | |
d2eb35ac | 578 | sectors = r1_bio->sectors; |
76073054 | 579 | best_disk = -1; |
9dedf603 | 580 | best_dist_disk = -1; |
76073054 | 581 | best_dist = MaxSector; |
9dedf603 SL |
582 | best_pending_disk = -1; |
583 | min_pending = UINT_MAX; | |
d2eb35ac | 584 | best_good_sectors = 0; |
9dedf603 | 585 | has_nonrot_disk = 0; |
12cee5a8 | 586 | choose_next_idle = 0; |
2e52d449 | 587 | clear_bit(R1BIO_FailFast, &r1_bio->state); |
d2eb35ac | 588 | |
7d49ffcf GR |
589 | if ((conf->mddev->recovery_cp < this_sector + sectors) || |
590 | (mddev_is_clustered(conf->mddev) && | |
90382ed9 | 591 | md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, |
7d49ffcf GR |
592 | this_sector + sectors))) |
593 | choose_first = 1; | |
594 | else | |
595 | choose_first = 0; | |
1da177e4 | 596 | |
be4d3280 | 597 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 598 | sector_t dist; |
d2eb35ac N |
599 | sector_t first_bad; |
600 | int bad_sectors; | |
9dedf603 | 601 | unsigned int pending; |
12cee5a8 | 602 | bool nonrot; |
d2eb35ac | 603 | |
f3ac8bf7 N |
604 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
605 | if (r1_bio->bios[disk] == IO_BLOCKED | |
606 | || rdev == NULL | |
76073054 | 607 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 608 | continue; |
76073054 N |
609 | if (!test_bit(In_sync, &rdev->flags) && |
610 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 611 | continue; |
76073054 N |
612 | if (test_bit(WriteMostly, &rdev->flags)) { |
613 | /* Don't balance among write-mostly, just | |
614 | * use the first as a last resort */ | |
d1901ef0 | 615 | if (best_dist_disk < 0) { |
307729c8 N |
616 | if (is_badblock(rdev, this_sector, sectors, |
617 | &first_bad, &bad_sectors)) { | |
816b0acf | 618 | if (first_bad <= this_sector) |
307729c8 N |
619 | /* Cannot use this */ |
620 | continue; | |
621 | best_good_sectors = first_bad - this_sector; | |
622 | } else | |
623 | best_good_sectors = sectors; | |
d1901ef0 TH |
624 | best_dist_disk = disk; |
625 | best_pending_disk = disk; | |
307729c8 | 626 | } |
76073054 N |
627 | continue; |
628 | } | |
629 | /* This is a reasonable device to use. It might | |
630 | * even be best. | |
631 | */ | |
d2eb35ac N |
632 | if (is_badblock(rdev, this_sector, sectors, |
633 | &first_bad, &bad_sectors)) { | |
634 | if (best_dist < MaxSector) | |
635 | /* already have a better device */ | |
636 | continue; | |
637 | if (first_bad <= this_sector) { | |
638 | /* cannot read here. If this is the 'primary' | |
639 | * device, then we must not read beyond | |
640 | * bad_sectors from another device.. | |
641 | */ | |
642 | bad_sectors -= (this_sector - first_bad); | |
643 | if (choose_first && sectors > bad_sectors) | |
644 | sectors = bad_sectors; | |
645 | if (best_good_sectors > sectors) | |
646 | best_good_sectors = sectors; | |
647 | ||
648 | } else { | |
649 | sector_t good_sectors = first_bad - this_sector; | |
650 | if (good_sectors > best_good_sectors) { | |
651 | best_good_sectors = good_sectors; | |
652 | best_disk = disk; | |
653 | } | |
654 | if (choose_first) | |
655 | break; | |
656 | } | |
657 | continue; | |
d82dd0e3 TM |
658 | } else { |
659 | if ((sectors > best_good_sectors) && (best_disk >= 0)) | |
660 | best_disk = -1; | |
d2eb35ac | 661 | best_good_sectors = sectors; |
d82dd0e3 | 662 | } |
d2eb35ac | 663 | |
2e52d449 N |
664 | if (best_disk >= 0) |
665 | /* At least two disks to choose from so failfast is OK */ | |
666 | set_bit(R1BIO_FailFast, &r1_bio->state); | |
667 | ||
12cee5a8 SL |
668 | nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
669 | has_nonrot_disk |= nonrot; | |
9dedf603 | 670 | pending = atomic_read(&rdev->nr_pending); |
76073054 | 671 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
12cee5a8 | 672 | if (choose_first) { |
76073054 | 673 | best_disk = disk; |
1da177e4 LT |
674 | break; |
675 | } | |
12cee5a8 SL |
676 | /* Don't change to another disk for sequential reads */ |
677 | if (conf->mirrors[disk].next_seq_sect == this_sector | |
678 | || dist == 0) { | |
679 | int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; | |
680 | struct raid1_info *mirror = &conf->mirrors[disk]; | |
681 | ||
682 | best_disk = disk; | |
683 | /* | |
684 | * If buffered sequential IO size exceeds optimal | |
685 | * iosize, check if there is idle disk. If yes, choose | |
686 | * the idle disk. read_balance could already choose an | |
687 | * idle disk before noticing it's a sequential IO in | |
688 | * this disk. This doesn't matter because this disk | |
689 | * will idle, next time it will be utilized after the | |
690 | * first disk has IO size exceeds optimal iosize. In | |
691 | * this way, iosize of the first disk will be optimal | |
692 | * iosize at least. iosize of the second disk might be | |
693 | * small, but not a big deal since when the second disk | |
694 | * starts IO, the first disk is likely still busy. | |
695 | */ | |
696 | if (nonrot && opt_iosize > 0 && | |
697 | mirror->seq_start != MaxSector && | |
698 | mirror->next_seq_sect > opt_iosize && | |
699 | mirror->next_seq_sect - opt_iosize >= | |
700 | mirror->seq_start) { | |
701 | choose_next_idle = 1; | |
702 | continue; | |
703 | } | |
704 | break; | |
705 | } | |
12cee5a8 SL |
706 | |
707 | if (choose_next_idle) | |
708 | continue; | |
9dedf603 SL |
709 | |
710 | if (min_pending > pending) { | |
711 | min_pending = pending; | |
712 | best_pending_disk = disk; | |
713 | } | |
714 | ||
76073054 N |
715 | if (dist < best_dist) { |
716 | best_dist = dist; | |
9dedf603 | 717 | best_dist_disk = disk; |
1da177e4 | 718 | } |
f3ac8bf7 | 719 | } |
1da177e4 | 720 | |
9dedf603 SL |
721 | /* |
722 | * If all disks are rotational, choose the closest disk. If any disk is | |
723 | * non-rotational, choose the disk with less pending request even the | |
724 | * disk is rotational, which might/might not be optimal for raids with | |
725 | * mixed ratation/non-rotational disks depending on workload. | |
726 | */ | |
727 | if (best_disk == -1) { | |
2e52d449 | 728 | if (has_nonrot_disk || min_pending == 0) |
9dedf603 SL |
729 | best_disk = best_pending_disk; |
730 | else | |
731 | best_disk = best_dist_disk; | |
732 | } | |
733 | ||
76073054 N |
734 | if (best_disk >= 0) { |
735 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
736 | if (!rdev) |
737 | goto retry; | |
738 | atomic_inc(&rdev->nr_pending); | |
d2eb35ac | 739 | sectors = best_good_sectors; |
12cee5a8 SL |
740 | |
741 | if (conf->mirrors[best_disk].next_seq_sect != this_sector) | |
742 | conf->mirrors[best_disk].seq_start = this_sector; | |
743 | ||
be4d3280 | 744 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 LT |
745 | } |
746 | rcu_read_unlock(); | |
d2eb35ac | 747 | *max_sectors = sectors; |
1da177e4 | 748 | |
76073054 | 749 | return best_disk; |
1da177e4 LT |
750 | } |
751 | ||
5c675f83 | 752 | static int raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 753 | { |
e8096360 | 754 | struct r1conf *conf = mddev->private; |
0d129228 N |
755 | int i, ret = 0; |
756 | ||
4452226e | 757 | if ((bits & (1 << WB_async_congested)) && |
34db0cd6 N |
758 | conf->pending_count >= max_queued_requests) |
759 | return 1; | |
760 | ||
0d129228 | 761 | rcu_read_lock(); |
f53e29fc | 762 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 763 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 764 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 765 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 766 | |
1ed7242e JB |
767 | BUG_ON(!q); |
768 | ||
0d129228 N |
769 | /* Note the '|| 1' - when read_balance prefers |
770 | * non-congested targets, it can be removed | |
771 | */ | |
4452226e | 772 | if ((bits & (1 << WB_async_congested)) || 1) |
dc3b17cc | 773 | ret |= bdi_congested(q->backing_dev_info, bits); |
0d129228 | 774 | else |
dc3b17cc | 775 | ret &= bdi_congested(q->backing_dev_info, bits); |
0d129228 N |
776 | } |
777 | } | |
778 | rcu_read_unlock(); | |
779 | return ret; | |
780 | } | |
0d129228 | 781 | |
673ca68d N |
782 | static void flush_bio_list(struct r1conf *conf, struct bio *bio) |
783 | { | |
784 | /* flush any pending bitmap writes to disk before proceeding w/ I/O */ | |
785 | bitmap_unplug(conf->mddev->bitmap); | |
786 | wake_up(&conf->wait_barrier); | |
787 | ||
788 | while (bio) { /* submit pending writes */ | |
789 | struct bio *next = bio->bi_next; | |
74d46992 | 790 | struct md_rdev *rdev = (void *)bio->bi_disk; |
673ca68d | 791 | bio->bi_next = NULL; |
74d46992 | 792 | bio_set_dev(bio, rdev->bdev); |
673ca68d | 793 | if (test_bit(Faulty, &rdev->flags)) { |
6308d8e3 | 794 | bio_io_error(bio); |
673ca68d | 795 | } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && |
74d46992 | 796 | !blk_queue_discard(bio->bi_disk->queue))) |
673ca68d N |
797 | /* Just ignore it */ |
798 | bio_endio(bio); | |
799 | else | |
800 | generic_make_request(bio); | |
801 | bio = next; | |
802 | } | |
803 | } | |
804 | ||
e8096360 | 805 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
806 | { |
807 | /* Any writes that have been queued but are awaiting | |
808 | * bitmap updates get flushed here. | |
a35e63ef | 809 | */ |
a35e63ef N |
810 | spin_lock_irq(&conf->device_lock); |
811 | ||
812 | if (conf->pending_bio_list.head) { | |
813 | struct bio *bio; | |
814 | bio = bio_list_get(&conf->pending_bio_list); | |
34db0cd6 | 815 | conf->pending_count = 0; |
a35e63ef | 816 | spin_unlock_irq(&conf->device_lock); |
673ca68d | 817 | flush_bio_list(conf, bio); |
a35e63ef N |
818 | } else |
819 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
820 | } |
821 | ||
17999be4 N |
822 | /* Barriers.... |
823 | * Sometimes we need to suspend IO while we do something else, | |
824 | * either some resync/recovery, or reconfigure the array. | |
825 | * To do this we raise a 'barrier'. | |
826 | * The 'barrier' is a counter that can be raised multiple times | |
827 | * to count how many activities are happening which preclude | |
828 | * normal IO. | |
829 | * We can only raise the barrier if there is no pending IO. | |
830 | * i.e. if nr_pending == 0. | |
831 | * We choose only to raise the barrier if no-one is waiting for the | |
832 | * barrier to go down. This means that as soon as an IO request | |
833 | * is ready, no other operations which require a barrier will start | |
834 | * until the IO request has had a chance. | |
835 | * | |
836 | * So: regular IO calls 'wait_barrier'. When that returns there | |
837 | * is no backgroup IO happening, It must arrange to call | |
838 | * allow_barrier when it has finished its IO. | |
839 | * backgroup IO calls must call raise_barrier. Once that returns | |
840 | * there is no normal IO happeing. It must arrange to call | |
841 | * lower_barrier when the particular background IO completes. | |
1da177e4 | 842 | */ |
c2fd4c94 | 843 | static void raise_barrier(struct r1conf *conf, sector_t sector_nr) |
1da177e4 | 844 | { |
fd76863e | 845 | int idx = sector_to_idx(sector_nr); |
846 | ||
1da177e4 | 847 | spin_lock_irq(&conf->resync_lock); |
17999be4 N |
848 | |
849 | /* Wait until no block IO is waiting */ | |
824e47da | 850 | wait_event_lock_irq(conf->wait_barrier, |
851 | !atomic_read(&conf->nr_waiting[idx]), | |
eed8c02e | 852 | conf->resync_lock); |
17999be4 N |
853 | |
854 | /* block any new IO from starting */ | |
824e47da | 855 | atomic_inc(&conf->barrier[idx]); |
856 | /* | |
857 | * In raise_barrier() we firstly increase conf->barrier[idx] then | |
858 | * check conf->nr_pending[idx]. In _wait_barrier() we firstly | |
859 | * increase conf->nr_pending[idx] then check conf->barrier[idx]. | |
860 | * A memory barrier here to make sure conf->nr_pending[idx] won't | |
861 | * be fetched before conf->barrier[idx] is increased. Otherwise | |
862 | * there will be a race between raise_barrier() and _wait_barrier(). | |
863 | */ | |
864 | smp_mb__after_atomic(); | |
17999be4 | 865 | |
79ef3a8a | 866 | /* For these conditions we must wait: |
867 | * A: while the array is in frozen state | |
fd76863e | 868 | * B: while conf->nr_pending[idx] is not 0, meaning regular I/O |
869 | * existing in corresponding I/O barrier bucket. | |
870 | * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches | |
871 | * max resync count which allowed on current I/O barrier bucket. | |
79ef3a8a | 872 | */ |
17999be4 | 873 | wait_event_lock_irq(conf->wait_barrier, |
b364e3d0 | 874 | !conf->array_frozen && |
824e47da | 875 | !atomic_read(&conf->nr_pending[idx]) && |
876 | atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH, | |
eed8c02e | 877 | conf->resync_lock); |
17999be4 | 878 | |
43ac9b84 | 879 | atomic_inc(&conf->nr_sync_pending); |
17999be4 N |
880 | spin_unlock_irq(&conf->resync_lock); |
881 | } | |
882 | ||
fd76863e | 883 | static void lower_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 884 | { |
fd76863e | 885 | int idx = sector_to_idx(sector_nr); |
886 | ||
824e47da | 887 | BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); |
fd76863e | 888 | |
824e47da | 889 | atomic_dec(&conf->barrier[idx]); |
43ac9b84 | 890 | atomic_dec(&conf->nr_sync_pending); |
17999be4 N |
891 | wake_up(&conf->wait_barrier); |
892 | } | |
893 | ||
fd76863e | 894 | static void _wait_barrier(struct r1conf *conf, int idx) |
17999be4 | 895 | { |
824e47da | 896 | /* |
897 | * We need to increase conf->nr_pending[idx] very early here, | |
898 | * then raise_barrier() can be blocked when it waits for | |
899 | * conf->nr_pending[idx] to be 0. Then we can avoid holding | |
900 | * conf->resync_lock when there is no barrier raised in same | |
901 | * barrier unit bucket. Also if the array is frozen, I/O | |
902 | * should be blocked until array is unfrozen. | |
903 | */ | |
904 | atomic_inc(&conf->nr_pending[idx]); | |
905 | /* | |
906 | * In _wait_barrier() we firstly increase conf->nr_pending[idx], then | |
907 | * check conf->barrier[idx]. In raise_barrier() we firstly increase | |
908 | * conf->barrier[idx], then check conf->nr_pending[idx]. A memory | |
909 | * barrier is necessary here to make sure conf->barrier[idx] won't be | |
910 | * fetched before conf->nr_pending[idx] is increased. Otherwise there | |
911 | * will be a race between _wait_barrier() and raise_barrier(). | |
912 | */ | |
913 | smp_mb__after_atomic(); | |
79ef3a8a | 914 | |
824e47da | 915 | /* |
916 | * Don't worry about checking two atomic_t variables at same time | |
917 | * here. If during we check conf->barrier[idx], the array is | |
918 | * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is | |
919 | * 0, it is safe to return and make the I/O continue. Because the | |
920 | * array is frozen, all I/O returned here will eventually complete | |
921 | * or be queued, no race will happen. See code comment in | |
922 | * frozen_array(). | |
923 | */ | |
924 | if (!READ_ONCE(conf->array_frozen) && | |
925 | !atomic_read(&conf->barrier[idx])) | |
926 | return; | |
79ef3a8a | 927 | |
824e47da | 928 | /* |
929 | * After holding conf->resync_lock, conf->nr_pending[idx] | |
930 | * should be decreased before waiting for barrier to drop. | |
931 | * Otherwise, we may encounter a race condition because | |
932 | * raise_barrer() might be waiting for conf->nr_pending[idx] | |
933 | * to be 0 at same time. | |
934 | */ | |
935 | spin_lock_irq(&conf->resync_lock); | |
936 | atomic_inc(&conf->nr_waiting[idx]); | |
937 | atomic_dec(&conf->nr_pending[idx]); | |
938 | /* | |
939 | * In case freeze_array() is waiting for | |
940 | * get_unqueued_pending() == extra | |
941 | */ | |
942 | wake_up(&conf->wait_barrier); | |
943 | /* Wait for the barrier in same barrier unit bucket to drop. */ | |
944 | wait_event_lock_irq(conf->wait_barrier, | |
945 | !conf->array_frozen && | |
946 | !atomic_read(&conf->barrier[idx]), | |
947 | conf->resync_lock); | |
948 | atomic_inc(&conf->nr_pending[idx]); | |
949 | atomic_dec(&conf->nr_waiting[idx]); | |
fd76863e | 950 | spin_unlock_irq(&conf->resync_lock); |
79ef3a8a | 951 | } |
952 | ||
fd76863e | 953 | static void wait_read_barrier(struct r1conf *conf, sector_t sector_nr) |
79ef3a8a | 954 | { |
fd76863e | 955 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 956 | |
824e47da | 957 | /* |
958 | * Very similar to _wait_barrier(). The difference is, for read | |
959 | * I/O we don't need wait for sync I/O, but if the whole array | |
960 | * is frozen, the read I/O still has to wait until the array is | |
961 | * unfrozen. Since there is no ordering requirement with | |
962 | * conf->barrier[idx] here, memory barrier is unnecessary as well. | |
963 | */ | |
964 | atomic_inc(&conf->nr_pending[idx]); | |
79ef3a8a | 965 | |
824e47da | 966 | if (!READ_ONCE(conf->array_frozen)) |
967 | return; | |
968 | ||
969 | spin_lock_irq(&conf->resync_lock); | |
970 | atomic_inc(&conf->nr_waiting[idx]); | |
971 | atomic_dec(&conf->nr_pending[idx]); | |
972 | /* | |
973 | * In case freeze_array() is waiting for | |
974 | * get_unqueued_pending() == extra | |
975 | */ | |
976 | wake_up(&conf->wait_barrier); | |
977 | /* Wait for array to be unfrozen */ | |
978 | wait_event_lock_irq(conf->wait_barrier, | |
979 | !conf->array_frozen, | |
980 | conf->resync_lock); | |
981 | atomic_inc(&conf->nr_pending[idx]); | |
982 | atomic_dec(&conf->nr_waiting[idx]); | |
1da177e4 LT |
983 | spin_unlock_irq(&conf->resync_lock); |
984 | } | |
985 | ||
fd76863e | 986 | static void wait_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 987 | { |
fd76863e | 988 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 989 | |
fd76863e | 990 | _wait_barrier(conf, idx); |
991 | } | |
992 | ||
993 | static void wait_all_barriers(struct r1conf *conf) | |
994 | { | |
995 | int idx; | |
996 | ||
997 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) | |
998 | _wait_barrier(conf, idx); | |
999 | } | |
1000 | ||
1001 | static void _allow_barrier(struct r1conf *conf, int idx) | |
17999be4 | 1002 | { |
824e47da | 1003 | atomic_dec(&conf->nr_pending[idx]); |
17999be4 N |
1004 | wake_up(&conf->wait_barrier); |
1005 | } | |
1006 | ||
fd76863e | 1007 | static void allow_barrier(struct r1conf *conf, sector_t sector_nr) |
1008 | { | |
1009 | int idx = sector_to_idx(sector_nr); | |
1010 | ||
1011 | _allow_barrier(conf, idx); | |
1012 | } | |
1013 | ||
1014 | static void allow_all_barriers(struct r1conf *conf) | |
1015 | { | |
1016 | int idx; | |
1017 | ||
1018 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) | |
1019 | _allow_barrier(conf, idx); | |
1020 | } | |
1021 | ||
1022 | /* conf->resync_lock should be held */ | |
1023 | static int get_unqueued_pending(struct r1conf *conf) | |
1024 | { | |
1025 | int idx, ret; | |
1026 | ||
43ac9b84 XN |
1027 | ret = atomic_read(&conf->nr_sync_pending); |
1028 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) | |
824e47da | 1029 | ret += atomic_read(&conf->nr_pending[idx]) - |
1030 | atomic_read(&conf->nr_queued[idx]); | |
fd76863e | 1031 | |
1032 | return ret; | |
1033 | } | |
1034 | ||
e2d59925 | 1035 | static void freeze_array(struct r1conf *conf, int extra) |
ddaf22ab | 1036 | { |
fd76863e | 1037 | /* Stop sync I/O and normal I/O and wait for everything to |
11353b9d | 1038 | * go quiet. |
fd76863e | 1039 | * This is called in two situations: |
1040 | * 1) management command handlers (reshape, remove disk, quiesce). | |
1041 | * 2) one normal I/O request failed. | |
1042 | ||
1043 | * After array_frozen is set to 1, new sync IO will be blocked at | |
1044 | * raise_barrier(), and new normal I/O will blocked at _wait_barrier() | |
1045 | * or wait_read_barrier(). The flying I/Os will either complete or be | |
1046 | * queued. When everything goes quite, there are only queued I/Os left. | |
1047 | ||
1048 | * Every flying I/O contributes to a conf->nr_pending[idx], idx is the | |
1049 | * barrier bucket index which this I/O request hits. When all sync and | |
1050 | * normal I/O are queued, sum of all conf->nr_pending[] will match sum | |
1051 | * of all conf->nr_queued[]. But normal I/O failure is an exception, | |
1052 | * in handle_read_error(), we may call freeze_array() before trying to | |
1053 | * fix the read error. In this case, the error read I/O is not queued, | |
1054 | * so get_unqueued_pending() == 1. | |
1055 | * | |
1056 | * Therefore before this function returns, we need to wait until | |
1057 | * get_unqueued_pendings(conf) gets equal to extra. For | |
1058 | * normal I/O context, extra is 1, in rested situations extra is 0. | |
ddaf22ab N |
1059 | */ |
1060 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1061 | conf->array_frozen = 1; |
578b54ad | 1062 | raid1_log(conf->mddev, "wait freeze"); |
fd76863e | 1063 | wait_event_lock_irq_cmd( |
1064 | conf->wait_barrier, | |
1065 | get_unqueued_pending(conf) == extra, | |
1066 | conf->resync_lock, | |
1067 | flush_pending_writes(conf)); | |
ddaf22ab N |
1068 | spin_unlock_irq(&conf->resync_lock); |
1069 | } | |
e8096360 | 1070 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
1071 | { |
1072 | /* reverse the effect of the freeze */ | |
1073 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1074 | conf->array_frozen = 0; |
ddaf22ab | 1075 | spin_unlock_irq(&conf->resync_lock); |
824e47da | 1076 | wake_up(&conf->wait_barrier); |
ddaf22ab N |
1077 | } |
1078 | ||
16d56e2f | 1079 | static void alloc_behind_master_bio(struct r1bio *r1_bio, |
cb83efcf | 1080 | struct bio *bio) |
4b6d287f | 1081 | { |
cb83efcf | 1082 | int size = bio->bi_iter.bi_size; |
841c1316 ML |
1083 | unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1084 | int i = 0; | |
1085 | struct bio *behind_bio = NULL; | |
1086 | ||
1087 | behind_bio = bio_alloc_mddev(GFP_NOIO, vcnt, r1_bio->mddev); | |
1088 | if (!behind_bio) | |
16d56e2f | 1089 | return; |
4b6d287f | 1090 | |
41743c1f | 1091 | /* discard op, we don't support writezero/writesame yet */ |
16d56e2f SL |
1092 | if (!bio_has_data(bio)) { |
1093 | behind_bio->bi_iter.bi_size = size; | |
41743c1f | 1094 | goto skip_copy; |
16d56e2f | 1095 | } |
41743c1f | 1096 | |
841c1316 ML |
1097 | while (i < vcnt && size) { |
1098 | struct page *page; | |
1099 | int len = min_t(int, PAGE_SIZE, size); | |
1100 | ||
1101 | page = alloc_page(GFP_NOIO); | |
1102 | if (unlikely(!page)) | |
1103 | goto free_pages; | |
1104 | ||
1105 | bio_add_page(behind_bio, page, len, 0); | |
1106 | ||
1107 | size -= len; | |
1108 | i++; | |
4b6d287f | 1109 | } |
841c1316 | 1110 | |
cb83efcf | 1111 | bio_copy_data(behind_bio, bio); |
41743c1f | 1112 | skip_copy: |
841c1316 | 1113 | r1_bio->behind_master_bio = behind_bio;; |
af6d7b76 | 1114 | set_bit(R1BIO_BehindIO, &r1_bio->state); |
4b6d287f | 1115 | |
16d56e2f | 1116 | return; |
841c1316 ML |
1117 | |
1118 | free_pages: | |
4f024f37 KO |
1119 | pr_debug("%dB behind alloc failed, doing sync I/O\n", |
1120 | bio->bi_iter.bi_size); | |
841c1316 | 1121 | bio_free_pages(behind_bio); |
16d56e2f | 1122 | bio_put(behind_bio); |
4b6d287f N |
1123 | } |
1124 | ||
f54a9d0e N |
1125 | struct raid1_plug_cb { |
1126 | struct blk_plug_cb cb; | |
1127 | struct bio_list pending; | |
1128 | int pending_cnt; | |
1129 | }; | |
1130 | ||
1131 | static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
1132 | { | |
1133 | struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, | |
1134 | cb); | |
1135 | struct mddev *mddev = plug->cb.data; | |
1136 | struct r1conf *conf = mddev->private; | |
1137 | struct bio *bio; | |
1138 | ||
874807a8 | 1139 | if (from_schedule || current->bio_list) { |
f54a9d0e N |
1140 | spin_lock_irq(&conf->device_lock); |
1141 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
1142 | conf->pending_count += plug->pending_cnt; | |
1143 | spin_unlock_irq(&conf->device_lock); | |
ee0b0244 | 1144 | wake_up(&conf->wait_barrier); |
f54a9d0e N |
1145 | md_wakeup_thread(mddev->thread); |
1146 | kfree(plug); | |
1147 | return; | |
1148 | } | |
1149 | ||
1150 | /* we aren't scheduling, so we can do the write-out directly. */ | |
1151 | bio = bio_list_get(&plug->pending); | |
673ca68d | 1152 | flush_bio_list(conf, bio); |
f54a9d0e N |
1153 | kfree(plug); |
1154 | } | |
1155 | ||
689389a0 N |
1156 | static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) |
1157 | { | |
1158 | r1_bio->master_bio = bio; | |
1159 | r1_bio->sectors = bio_sectors(bio); | |
1160 | r1_bio->state = 0; | |
1161 | r1_bio->mddev = mddev; | |
1162 | r1_bio->sector = bio->bi_iter.bi_sector; | |
1163 | } | |
1164 | ||
fd76863e | 1165 | static inline struct r1bio * |
689389a0 | 1166 | alloc_r1bio(struct mddev *mddev, struct bio *bio) |
fd76863e | 1167 | { |
1168 | struct r1conf *conf = mddev->private; | |
1169 | struct r1bio *r1_bio; | |
1170 | ||
1171 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
689389a0 N |
1172 | /* Ensure no bio records IO_BLOCKED */ |
1173 | memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); | |
1174 | init_r1bio(r1_bio, mddev, bio); | |
fd76863e | 1175 | return r1_bio; |
1176 | } | |
1177 | ||
c230e7e5 | 1178 | static void raid1_read_request(struct mddev *mddev, struct bio *bio, |
689389a0 | 1179 | int max_read_sectors, struct r1bio *r1_bio) |
1da177e4 | 1180 | { |
e8096360 | 1181 | struct r1conf *conf = mddev->private; |
0eaf822c | 1182 | struct raid1_info *mirror; |
1da177e4 | 1183 | struct bio *read_bio; |
3b046a97 RL |
1184 | struct bitmap *bitmap = mddev->bitmap; |
1185 | const int op = bio_op(bio); | |
1186 | const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); | |
3b046a97 RL |
1187 | int max_sectors; |
1188 | int rdisk; | |
689389a0 N |
1189 | bool print_msg = !!r1_bio; |
1190 | char b[BDEVNAME_SIZE]; | |
3b046a97 | 1191 | |
fd76863e | 1192 | /* |
689389a0 N |
1193 | * If r1_bio is set, we are blocking the raid1d thread |
1194 | * so there is a tiny risk of deadlock. So ask for | |
1195 | * emergency memory if needed. | |
fd76863e | 1196 | */ |
689389a0 | 1197 | gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; |
fd76863e | 1198 | |
689389a0 N |
1199 | if (print_msg) { |
1200 | /* Need to get the block device name carefully */ | |
1201 | struct md_rdev *rdev; | |
1202 | rcu_read_lock(); | |
1203 | rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev); | |
1204 | if (rdev) | |
1205 | bdevname(rdev->bdev, b); | |
1206 | else | |
1207 | strcpy(b, "???"); | |
1208 | rcu_read_unlock(); | |
1209 | } | |
3b046a97 | 1210 | |
fd76863e | 1211 | /* |
fd76863e | 1212 | * Still need barrier for READ in case that whole |
1213 | * array is frozen. | |
fd76863e | 1214 | */ |
fd76863e | 1215 | wait_read_barrier(conf, bio->bi_iter.bi_sector); |
1216 | ||
689389a0 N |
1217 | if (!r1_bio) |
1218 | r1_bio = alloc_r1bio(mddev, bio); | |
1219 | else | |
1220 | init_r1bio(r1_bio, mddev, bio); | |
c230e7e5 | 1221 | r1_bio->sectors = max_read_sectors; |
fd76863e | 1222 | |
1223 | /* | |
1224 | * make_request() can abort the operation when read-ahead is being | |
1225 | * used and no empty request is available. | |
1226 | */ | |
3b046a97 RL |
1227 | rdisk = read_balance(conf, r1_bio, &max_sectors); |
1228 | ||
1229 | if (rdisk < 0) { | |
1230 | /* couldn't find anywhere to read from */ | |
689389a0 N |
1231 | if (print_msg) { |
1232 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", | |
1233 | mdname(mddev), | |
1234 | b, | |
1235 | (unsigned long long)r1_bio->sector); | |
1236 | } | |
3b046a97 RL |
1237 | raid_end_bio_io(r1_bio); |
1238 | return; | |
1239 | } | |
1240 | mirror = conf->mirrors + rdisk; | |
1241 | ||
689389a0 N |
1242 | if (print_msg) |
1243 | pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", | |
1244 | mdname(mddev), | |
1245 | (unsigned long long)r1_bio->sector, | |
1246 | bdevname(mirror->rdev->bdev, b)); | |
1247 | ||
3b046a97 RL |
1248 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
1249 | bitmap) { | |
1250 | /* | |
1251 | * Reading from a write-mostly device must take care not to | |
1252 | * over-take any writes that are 'behind' | |
1253 | */ | |
1254 | raid1_log(mddev, "wait behind writes"); | |
1255 | wait_event(bitmap->behind_wait, | |
1256 | atomic_read(&bitmap->behind_writes) == 0); | |
1257 | } | |
c230e7e5 N |
1258 | |
1259 | if (max_sectors < bio_sectors(bio)) { | |
1260 | struct bio *split = bio_split(bio, max_sectors, | |
689389a0 | 1261 | gfp, conf->bio_split); |
c230e7e5 N |
1262 | bio_chain(split, bio); |
1263 | generic_make_request(bio); | |
1264 | bio = split; | |
1265 | r1_bio->master_bio = bio; | |
1266 | r1_bio->sectors = max_sectors; | |
1267 | } | |
1268 | ||
3b046a97 | 1269 | r1_bio->read_disk = rdisk; |
3b046a97 | 1270 | |
689389a0 | 1271 | read_bio = bio_clone_fast(bio, gfp, mddev->bio_set); |
3b046a97 RL |
1272 | |
1273 | r1_bio->bios[rdisk] = read_bio; | |
1274 | ||
1275 | read_bio->bi_iter.bi_sector = r1_bio->sector + | |
1276 | mirror->rdev->data_offset; | |
74d46992 | 1277 | bio_set_dev(read_bio, mirror->rdev->bdev); |
3b046a97 RL |
1278 | read_bio->bi_end_io = raid1_end_read_request; |
1279 | bio_set_op_attrs(read_bio, op, do_sync); | |
1280 | if (test_bit(FailFast, &mirror->rdev->flags) && | |
1281 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
1282 | read_bio->bi_opf |= MD_FAILFAST; | |
1283 | read_bio->bi_private = r1_bio; | |
1284 | ||
1285 | if (mddev->gendisk) | |
74d46992 CH |
1286 | trace_block_bio_remap(read_bio->bi_disk->queue, read_bio, |
1287 | disk_devt(mddev->gendisk), r1_bio->sector); | |
3b046a97 | 1288 | |
c230e7e5 | 1289 | generic_make_request(read_bio); |
3b046a97 RL |
1290 | } |
1291 | ||
c230e7e5 N |
1292 | static void raid1_write_request(struct mddev *mddev, struct bio *bio, |
1293 | int max_write_sectors) | |
3b046a97 RL |
1294 | { |
1295 | struct r1conf *conf = mddev->private; | |
fd76863e | 1296 | struct r1bio *r1_bio; |
1f68f0c4 | 1297 | int i, disks; |
3b046a97 | 1298 | struct bitmap *bitmap = mddev->bitmap; |
191ea9b2 | 1299 | unsigned long flags; |
3cb03002 | 1300 | struct md_rdev *blocked_rdev; |
f54a9d0e N |
1301 | struct blk_plug_cb *cb; |
1302 | struct raid1_plug_cb *plug = NULL; | |
1f68f0c4 | 1303 | int first_clone; |
1f68f0c4 | 1304 | int max_sectors; |
191ea9b2 | 1305 | |
1da177e4 LT |
1306 | /* |
1307 | * Register the new request and wait if the reconstruction | |
1308 | * thread has put up a bar for new requests. | |
1309 | * Continue immediately if no resync is active currently. | |
1310 | */ | |
62de608d | 1311 | |
3d310eb7 | 1312 | |
b3143b9a | 1313 | if (mddev_is_clustered(mddev) && |
90382ed9 | 1314 | md_cluster_ops->area_resyncing(mddev, WRITE, |
b3143b9a | 1315 | bio->bi_iter.bi_sector, bio_end_sector(bio))) { |
3b046a97 RL |
1316 | |
1317 | /* | |
1318 | * As the suspend_* range is controlled by userspace, we want | |
1319 | * an interruptible wait. | |
6eef4b21 N |
1320 | */ |
1321 | DEFINE_WAIT(w); | |
1322 | for (;;) { | |
f9c79bc0 | 1323 | sigset_t full, old; |
6eef4b21 N |
1324 | prepare_to_wait(&conf->wait_barrier, |
1325 | &w, TASK_INTERRUPTIBLE); | |
b3143b9a N |
1326 | if (!mddev_is_clustered(mddev) || |
1327 | !md_cluster_ops->area_resyncing(mddev, WRITE, | |
385f4d7f | 1328 | bio->bi_iter.bi_sector, |
b3143b9a | 1329 | bio_end_sector(bio))) |
6eef4b21 | 1330 | break; |
f9c79bc0 MP |
1331 | sigfillset(&full); |
1332 | sigprocmask(SIG_BLOCK, &full, &old); | |
6eef4b21 | 1333 | schedule(); |
f9c79bc0 | 1334 | sigprocmask(SIG_SETMASK, &old, NULL); |
6eef4b21 N |
1335 | } |
1336 | finish_wait(&conf->wait_barrier, &w); | |
1337 | } | |
fd76863e | 1338 | wait_barrier(conf, bio->bi_iter.bi_sector); |
1339 | ||
689389a0 | 1340 | r1_bio = alloc_r1bio(mddev, bio); |
c230e7e5 | 1341 | r1_bio->sectors = max_write_sectors; |
1da177e4 | 1342 | |
34db0cd6 N |
1343 | if (conf->pending_count >= max_queued_requests) { |
1344 | md_wakeup_thread(mddev->thread); | |
578b54ad | 1345 | raid1_log(mddev, "wait queued"); |
34db0cd6 N |
1346 | wait_event(conf->wait_barrier, |
1347 | conf->pending_count < max_queued_requests); | |
1348 | } | |
1f68f0c4 | 1349 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1350 | * inc refcount on their rdev. Record them by setting |
1351 | * bios[x] to bio | |
1f68f0c4 N |
1352 | * If there are known/acknowledged bad blocks on any device on |
1353 | * which we have seen a write error, we want to avoid writing those | |
1354 | * blocks. | |
1355 | * This potentially requires several writes to write around | |
1356 | * the bad blocks. Each set of writes gets it's own r1bio | |
1357 | * with a set of bios attached. | |
1da177e4 | 1358 | */ |
c3b328ac | 1359 | |
8f19ccb2 | 1360 | disks = conf->raid_disks * 2; |
6bfe0b49 DW |
1361 | retry_write: |
1362 | blocked_rdev = NULL; | |
1da177e4 | 1363 | rcu_read_lock(); |
1f68f0c4 | 1364 | max_sectors = r1_bio->sectors; |
1da177e4 | 1365 | for (i = 0; i < disks; i++) { |
3cb03002 | 1366 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
1367 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1368 | atomic_inc(&rdev->nr_pending); | |
1369 | blocked_rdev = rdev; | |
1370 | break; | |
1371 | } | |
1f68f0c4 | 1372 | r1_bio->bios[i] = NULL; |
8ae12666 | 1373 | if (!rdev || test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
1374 | if (i < conf->raid_disks) |
1375 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1376 | continue; |
1377 | } | |
1378 | ||
1379 | atomic_inc(&rdev->nr_pending); | |
1380 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1381 | sector_t first_bad; | |
1382 | int bad_sectors; | |
1383 | int is_bad; | |
1384 | ||
3b046a97 | 1385 | is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, |
1f68f0c4 N |
1386 | &first_bad, &bad_sectors); |
1387 | if (is_bad < 0) { | |
1388 | /* mustn't write here until the bad block is | |
1389 | * acknowledged*/ | |
1390 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1391 | blocked_rdev = rdev; | |
1392 | break; | |
1393 | } | |
1394 | if (is_bad && first_bad <= r1_bio->sector) { | |
1395 | /* Cannot write here at all */ | |
1396 | bad_sectors -= (r1_bio->sector - first_bad); | |
1397 | if (bad_sectors < max_sectors) | |
1398 | /* mustn't write more than bad_sectors | |
1399 | * to other devices yet | |
1400 | */ | |
1401 | max_sectors = bad_sectors; | |
03c902e1 | 1402 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1403 | /* We don't set R1BIO_Degraded as that |
1404 | * only applies if the disk is | |
1405 | * missing, so it might be re-added, | |
1406 | * and we want to know to recover this | |
1407 | * chunk. | |
1408 | * In this case the device is here, | |
1409 | * and the fact that this chunk is not | |
1410 | * in-sync is recorded in the bad | |
1411 | * block log | |
1412 | */ | |
1413 | continue; | |
964147d5 | 1414 | } |
1f68f0c4 N |
1415 | if (is_bad) { |
1416 | int good_sectors = first_bad - r1_bio->sector; | |
1417 | if (good_sectors < max_sectors) | |
1418 | max_sectors = good_sectors; | |
1419 | } | |
1420 | } | |
1421 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1422 | } |
1423 | rcu_read_unlock(); | |
1424 | ||
6bfe0b49 DW |
1425 | if (unlikely(blocked_rdev)) { |
1426 | /* Wait for this device to become unblocked */ | |
1427 | int j; | |
1428 | ||
1429 | for (j = 0; j < i; j++) | |
1430 | if (r1_bio->bios[j]) | |
1431 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1432 | r1_bio->state = 0; |
fd76863e | 1433 | allow_barrier(conf, bio->bi_iter.bi_sector); |
578b54ad | 1434 | raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); |
6bfe0b49 | 1435 | md_wait_for_blocked_rdev(blocked_rdev, mddev); |
fd76863e | 1436 | wait_barrier(conf, bio->bi_iter.bi_sector); |
6bfe0b49 DW |
1437 | goto retry_write; |
1438 | } | |
1439 | ||
c230e7e5 N |
1440 | if (max_sectors < bio_sectors(bio)) { |
1441 | struct bio *split = bio_split(bio, max_sectors, | |
1442 | GFP_NOIO, conf->bio_split); | |
1443 | bio_chain(split, bio); | |
1444 | generic_make_request(bio); | |
1445 | bio = split; | |
1446 | r1_bio->master_bio = bio; | |
1f68f0c4 | 1447 | r1_bio->sectors = max_sectors; |
191ea9b2 | 1448 | } |
4b6d287f | 1449 | |
4e78064f | 1450 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1451 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1452 | |
1f68f0c4 | 1453 | first_clone = 1; |
d8c84c4f | 1454 | |
1da177e4 | 1455 | for (i = 0; i < disks; i++) { |
8e58e327 | 1456 | struct bio *mbio = NULL; |
1da177e4 LT |
1457 | if (!r1_bio->bios[i]) |
1458 | continue; | |
1459 | ||
1f68f0c4 N |
1460 | |
1461 | if (first_clone) { | |
1462 | /* do behind I/O ? | |
1463 | * Not if there are too many, or cannot | |
1464 | * allocate memory, or a reader on WriteMostly | |
1465 | * is waiting for behind writes to flush */ | |
1466 | if (bitmap && | |
1467 | (atomic_read(&bitmap->behind_writes) | |
1468 | < mddev->bitmap_info.max_write_behind) && | |
8e58e327 | 1469 | !waitqueue_active(&bitmap->behind_wait)) { |
16d56e2f | 1470 | alloc_behind_master_bio(r1_bio, bio); |
8e58e327 | 1471 | } |
1f68f0c4 N |
1472 | |
1473 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1474 | r1_bio->sectors, | |
1475 | test_bit(R1BIO_BehindIO, | |
1476 | &r1_bio->state)); | |
1477 | first_clone = 0; | |
1478 | } | |
8e58e327 | 1479 | |
16d56e2f SL |
1480 | if (r1_bio->behind_master_bio) |
1481 | mbio = bio_clone_fast(r1_bio->behind_master_bio, | |
1482 | GFP_NOIO, mddev->bio_set); | |
1483 | else | |
1484 | mbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set); | |
8e58e327 | 1485 | |
841c1316 | 1486 | if (r1_bio->behind_master_bio) { |
4b6d287f N |
1487 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1488 | atomic_inc(&r1_bio->behind_remaining); | |
1489 | } | |
1490 | ||
1f68f0c4 N |
1491 | r1_bio->bios[i] = mbio; |
1492 | ||
4f024f37 | 1493 | mbio->bi_iter.bi_sector = (r1_bio->sector + |
1f68f0c4 | 1494 | conf->mirrors[i].rdev->data_offset); |
74d46992 | 1495 | bio_set_dev(mbio, conf->mirrors[i].rdev->bdev); |
1f68f0c4 | 1496 | mbio->bi_end_io = raid1_end_write_request; |
a682e003 | 1497 | mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); |
212e7eb7 N |
1498 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && |
1499 | !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && | |
1500 | conf->raid_disks - mddev->degraded > 1) | |
1501 | mbio->bi_opf |= MD_FAILFAST; | |
1f68f0c4 N |
1502 | mbio->bi_private = r1_bio; |
1503 | ||
1da177e4 | 1504 | atomic_inc(&r1_bio->remaining); |
f54a9d0e | 1505 | |
109e3765 | 1506 | if (mddev->gendisk) |
74d46992 | 1507 | trace_block_bio_remap(mbio->bi_disk->queue, |
109e3765 N |
1508 | mbio, disk_devt(mddev->gendisk), |
1509 | r1_bio->sector); | |
1510 | /* flush_pending_writes() needs access to the rdev so...*/ | |
74d46992 | 1511 | mbio->bi_disk = (void *)conf->mirrors[i].rdev; |
109e3765 | 1512 | |
f54a9d0e N |
1513 | cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); |
1514 | if (cb) | |
1515 | plug = container_of(cb, struct raid1_plug_cb, cb); | |
1516 | else | |
1517 | plug = NULL; | |
f54a9d0e N |
1518 | if (plug) { |
1519 | bio_list_add(&plug->pending, mbio); | |
1520 | plug->pending_cnt++; | |
1521 | } else { | |
23b245c0 | 1522 | spin_lock_irqsave(&conf->device_lock, flags); |
f54a9d0e N |
1523 | bio_list_add(&conf->pending_bio_list, mbio); |
1524 | conf->pending_count++; | |
23b245c0 | 1525 | spin_unlock_irqrestore(&conf->device_lock, flags); |
b357f04a | 1526 | md_wakeup_thread(mddev->thread); |
23b245c0 | 1527 | } |
1da177e4 | 1528 | } |
1f68f0c4 | 1529 | |
079fa166 N |
1530 | r1_bio_write_done(r1_bio); |
1531 | ||
1532 | /* In case raid1d snuck in to freeze_array */ | |
1533 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1534 | } |
1535 | ||
cc27b0c7 | 1536 | static bool raid1_make_request(struct mddev *mddev, struct bio *bio) |
3b046a97 | 1537 | { |
fd76863e | 1538 | sector_t sectors; |
3b046a97 | 1539 | |
aff8da09 SL |
1540 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
1541 | md_flush_request(mddev, bio); | |
cc27b0c7 | 1542 | return true; |
aff8da09 | 1543 | } |
3b046a97 | 1544 | |
c230e7e5 N |
1545 | /* |
1546 | * There is a limit to the maximum size, but | |
1547 | * the read/write handler might find a lower limit | |
1548 | * due to bad blocks. To avoid multiple splits, | |
1549 | * we pass the maximum number of sectors down | |
1550 | * and let the lower level perform the split. | |
1551 | */ | |
1552 | sectors = align_to_barrier_unit_end( | |
1553 | bio->bi_iter.bi_sector, bio_sectors(bio)); | |
61eb2b43 | 1554 | |
c230e7e5 | 1555 | if (bio_data_dir(bio) == READ) |
689389a0 | 1556 | raid1_read_request(mddev, bio, sectors, NULL); |
cc27b0c7 N |
1557 | else { |
1558 | if (!md_write_start(mddev,bio)) | |
1559 | return false; | |
c230e7e5 | 1560 | raid1_write_request(mddev, bio, sectors); |
cc27b0c7 N |
1561 | } |
1562 | return true; | |
3b046a97 RL |
1563 | } |
1564 | ||
849674e4 | 1565 | static void raid1_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1566 | { |
e8096360 | 1567 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1568 | int i; |
1569 | ||
1570 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1571 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1572 | rcu_read_lock(); |
1573 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1574 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1575 | seq_printf(seq, "%s", |
ddac7c7e N |
1576 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1577 | } | |
1578 | rcu_read_unlock(); | |
1da177e4 LT |
1579 | seq_printf(seq, "]"); |
1580 | } | |
1581 | ||
849674e4 | 1582 | static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1583 | { |
1584 | char b[BDEVNAME_SIZE]; | |
e8096360 | 1585 | struct r1conf *conf = mddev->private; |
423f04d6 | 1586 | unsigned long flags; |
1da177e4 LT |
1587 | |
1588 | /* | |
1589 | * If it is not operational, then we have already marked it as dead | |
1590 | * else if it is the last working disks, ignore the error, let the | |
1591 | * next level up know. | |
1592 | * else mark the drive as failed | |
1593 | */ | |
2e52d449 | 1594 | spin_lock_irqsave(&conf->device_lock, flags); |
b2d444d7 | 1595 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1596 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1597 | /* |
1598 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1599 | * normal single drive. |
1600 | * However don't try a recovery from this drive as | |
1601 | * it is very likely to fail. | |
1da177e4 | 1602 | */ |
5389042f | 1603 | conf->recovery_disabled = mddev->recovery_disabled; |
2e52d449 | 1604 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 1605 | return; |
4044ba58 | 1606 | } |
de393cde | 1607 | set_bit(Blocked, &rdev->flags); |
c04be0aa | 1608 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1da177e4 | 1609 | mddev->degraded++; |
dd00a99e | 1610 | set_bit(Faulty, &rdev->flags); |
dd00a99e N |
1611 | } else |
1612 | set_bit(Faulty, &rdev->flags); | |
423f04d6 | 1613 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2446dba0 N |
1614 | /* |
1615 | * if recovery is running, make sure it aborts. | |
1616 | */ | |
1617 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2953079c SL |
1618 | set_mask_bits(&mddev->sb_flags, 0, |
1619 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
1d41c216 N |
1620 | pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" |
1621 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
1622 | mdname(mddev), bdevname(rdev->bdev, b), | |
1623 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1624 | } |
1625 | ||
e8096360 | 1626 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1627 | { |
1628 | int i; | |
1da177e4 | 1629 | |
1d41c216 | 1630 | pr_debug("RAID1 conf printout:\n"); |
1da177e4 | 1631 | if (!conf) { |
1d41c216 | 1632 | pr_debug("(!conf)\n"); |
1da177e4 LT |
1633 | return; |
1634 | } | |
1d41c216 N |
1635 | pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1636 | conf->raid_disks); | |
1da177e4 | 1637 | |
ddac7c7e | 1638 | rcu_read_lock(); |
1da177e4 LT |
1639 | for (i = 0; i < conf->raid_disks; i++) { |
1640 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1641 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1642 | if (rdev) |
1d41c216 N |
1643 | pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", |
1644 | i, !test_bit(In_sync, &rdev->flags), | |
1645 | !test_bit(Faulty, &rdev->flags), | |
1646 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1647 | } |
ddac7c7e | 1648 | rcu_read_unlock(); |
1da177e4 LT |
1649 | } |
1650 | ||
e8096360 | 1651 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1652 | { |
fd76863e | 1653 | wait_all_barriers(conf); |
1654 | allow_all_barriers(conf); | |
1da177e4 LT |
1655 | |
1656 | mempool_destroy(conf->r1buf_pool); | |
1657 | conf->r1buf_pool = NULL; | |
1658 | } | |
1659 | ||
fd01b88c | 1660 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1661 | { |
1662 | int i; | |
e8096360 | 1663 | struct r1conf *conf = mddev->private; |
6b965620 N |
1664 | int count = 0; |
1665 | unsigned long flags; | |
1da177e4 LT |
1666 | |
1667 | /* | |
f72ffdd6 | 1668 | * Find all failed disks within the RAID1 configuration |
ddac7c7e N |
1669 | * and mark them readable. |
1670 | * Called under mddev lock, so rcu protection not needed. | |
423f04d6 N |
1671 | * device_lock used to avoid races with raid1_end_read_request |
1672 | * which expects 'In_sync' flags and ->degraded to be consistent. | |
1da177e4 | 1673 | */ |
423f04d6 | 1674 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 1675 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 1676 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1677 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1678 | if (repl | |
1aee41f6 | 1679 | && !test_bit(Candidate, &repl->flags) |
8c7a2c2b N |
1680 | && repl->recovery_offset == MaxSector |
1681 | && !test_bit(Faulty, &repl->flags) | |
1682 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1683 | /* replacement has just become active */ | |
1684 | if (!rdev || | |
1685 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1686 | count++; | |
1687 | if (rdev) { | |
1688 | /* Replaced device not technically | |
1689 | * faulty, but we need to be sure | |
1690 | * it gets removed and never re-added | |
1691 | */ | |
1692 | set_bit(Faulty, &rdev->flags); | |
1693 | sysfs_notify_dirent_safe( | |
1694 | rdev->sysfs_state); | |
1695 | } | |
1696 | } | |
ddac7c7e | 1697 | if (rdev |
61e4947c | 1698 | && rdev->recovery_offset == MaxSector |
ddac7c7e | 1699 | && !test_bit(Faulty, &rdev->flags) |
c04be0aa | 1700 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1701 | count++; |
654e8b5a | 1702 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1703 | } |
1704 | } | |
6b965620 N |
1705 | mddev->degraded -= count; |
1706 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1707 | |
1708 | print_conf(conf); | |
6b965620 | 1709 | return count; |
1da177e4 LT |
1710 | } |
1711 | ||
fd01b88c | 1712 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1713 | { |
e8096360 | 1714 | struct r1conf *conf = mddev->private; |
199050ea | 1715 | int err = -EEXIST; |
41158c7e | 1716 | int mirror = 0; |
0eaf822c | 1717 | struct raid1_info *p; |
6c2fce2e | 1718 | int first = 0; |
30194636 | 1719 | int last = conf->raid_disks - 1; |
1da177e4 | 1720 | |
5389042f N |
1721 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1722 | return -EBUSY; | |
1723 | ||
1501efad DW |
1724 | if (md_integrity_add_rdev(rdev, mddev)) |
1725 | return -ENXIO; | |
1726 | ||
6c2fce2e NB |
1727 | if (rdev->raid_disk >= 0) |
1728 | first = last = rdev->raid_disk; | |
1729 | ||
70bcecdb GR |
1730 | /* |
1731 | * find the disk ... but prefer rdev->saved_raid_disk | |
1732 | * if possible. | |
1733 | */ | |
1734 | if (rdev->saved_raid_disk >= 0 && | |
1735 | rdev->saved_raid_disk >= first && | |
1736 | conf->mirrors[rdev->saved_raid_disk].rdev == NULL) | |
1737 | first = last = rdev->saved_raid_disk; | |
1738 | ||
7ef449d1 N |
1739 | for (mirror = first; mirror <= last; mirror++) { |
1740 | p = conf->mirrors+mirror; | |
1741 | if (!p->rdev) { | |
1da177e4 | 1742 | |
9092c02d JB |
1743 | if (mddev->gendisk) |
1744 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1745 | rdev->data_offset << 9); | |
1da177e4 LT |
1746 | |
1747 | p->head_position = 0; | |
1748 | rdev->raid_disk = mirror; | |
199050ea | 1749 | err = 0; |
6aea114a N |
1750 | /* As all devices are equivalent, we don't need a full recovery |
1751 | * if this was recently any drive of the array | |
1752 | */ | |
1753 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1754 | conf->fullsync = 1; |
d6065f7b | 1755 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1756 | break; |
1757 | } | |
7ef449d1 N |
1758 | if (test_bit(WantReplacement, &p->rdev->flags) && |
1759 | p[conf->raid_disks].rdev == NULL) { | |
1760 | /* Add this device as a replacement */ | |
1761 | clear_bit(In_sync, &rdev->flags); | |
1762 | set_bit(Replacement, &rdev->flags); | |
1763 | rdev->raid_disk = mirror; | |
1764 | err = 0; | |
1765 | conf->fullsync = 1; | |
1766 | rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); | |
1767 | break; | |
1768 | } | |
1769 | } | |
9092c02d | 1770 | if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) |
2ff8cc2c | 1771 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); |
1da177e4 | 1772 | print_conf(conf); |
199050ea | 1773 | return err; |
1da177e4 LT |
1774 | } |
1775 | ||
b8321b68 | 1776 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1777 | { |
e8096360 | 1778 | struct r1conf *conf = mddev->private; |
1da177e4 | 1779 | int err = 0; |
b8321b68 | 1780 | int number = rdev->raid_disk; |
0eaf822c | 1781 | struct raid1_info *p = conf->mirrors + number; |
1da177e4 | 1782 | |
b014f14c N |
1783 | if (rdev != p->rdev) |
1784 | p = conf->mirrors + conf->raid_disks + number; | |
1785 | ||
1da177e4 | 1786 | print_conf(conf); |
b8321b68 | 1787 | if (rdev == p->rdev) { |
b2d444d7 | 1788 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1789 | atomic_read(&rdev->nr_pending)) { |
1790 | err = -EBUSY; | |
1791 | goto abort; | |
1792 | } | |
046abeed | 1793 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1794 | * is not possible. |
1795 | */ | |
1796 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1797 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1798 | mddev->degraded < conf->raid_disks) { |
1799 | err = -EBUSY; | |
1800 | goto abort; | |
1801 | } | |
1da177e4 | 1802 | p->rdev = NULL; |
d787be40 N |
1803 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
1804 | synchronize_rcu(); | |
1805 | if (atomic_read(&rdev->nr_pending)) { | |
1806 | /* lost the race, try later */ | |
1807 | err = -EBUSY; | |
1808 | p->rdev = rdev; | |
1809 | goto abort; | |
1810 | } | |
1811 | } | |
1812 | if (conf->mirrors[conf->raid_disks + number].rdev) { | |
8c7a2c2b N |
1813 | /* We just removed a device that is being replaced. |
1814 | * Move down the replacement. We drain all IO before | |
1815 | * doing this to avoid confusion. | |
1816 | */ | |
1817 | struct md_rdev *repl = | |
1818 | conf->mirrors[conf->raid_disks + number].rdev; | |
e2d59925 | 1819 | freeze_array(conf, 0); |
8c7a2c2b N |
1820 | clear_bit(Replacement, &repl->flags); |
1821 | p->rdev = repl; | |
1822 | conf->mirrors[conf->raid_disks + number].rdev = NULL; | |
e2d59925 | 1823 | unfreeze_array(conf); |
e5bc9c3c GJ |
1824 | } |
1825 | ||
1826 | clear_bit(WantReplacement, &rdev->flags); | |
a91a2785 | 1827 | err = md_integrity_register(mddev); |
1da177e4 LT |
1828 | } |
1829 | abort: | |
1830 | ||
1831 | print_conf(conf); | |
1832 | return err; | |
1833 | } | |
1834 | ||
4246a0b6 | 1835 | static void end_sync_read(struct bio *bio) |
1da177e4 | 1836 | { |
98d30c58 | 1837 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
1da177e4 | 1838 | |
0fc280f6 | 1839 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1840 | |
1da177e4 LT |
1841 | /* |
1842 | * we have read a block, now it needs to be re-written, | |
1843 | * or re-read if the read failed. | |
1844 | * We don't do much here, just schedule handling by raid1d | |
1845 | */ | |
4e4cbee9 | 1846 | if (!bio->bi_status) |
1da177e4 | 1847 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1848 | |
1849 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1850 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1851 | } |
1852 | ||
4246a0b6 | 1853 | static void end_sync_write(struct bio *bio) |
1da177e4 | 1854 | { |
4e4cbee9 | 1855 | int uptodate = !bio->bi_status; |
98d30c58 | 1856 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
fd01b88c | 1857 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1858 | struct r1conf *conf = mddev->private; |
4367af55 N |
1859 | sector_t first_bad; |
1860 | int bad_sectors; | |
854abd75 | 1861 | struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; |
ba3ae3be | 1862 | |
6b1117d5 | 1863 | if (!uptodate) { |
57dab0bd | 1864 | sector_t sync_blocks = 0; |
6b1117d5 N |
1865 | sector_t s = r1_bio->sector; |
1866 | long sectors_to_go = r1_bio->sectors; | |
1867 | /* make sure these bits doesn't get cleared. */ | |
1868 | do { | |
5e3db645 | 1869 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1870 | &sync_blocks, 1); |
1871 | s += sync_blocks; | |
1872 | sectors_to_go -= sync_blocks; | |
1873 | } while (sectors_to_go > 0); | |
854abd75 N |
1874 | set_bit(WriteErrorSeen, &rdev->flags); |
1875 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
1876 | set_bit(MD_RECOVERY_NEEDED, & |
1877 | mddev->recovery); | |
d8f05d29 | 1878 | set_bit(R1BIO_WriteError, &r1_bio->state); |
854abd75 | 1879 | } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
3a9f28a5 N |
1880 | &first_bad, &bad_sectors) && |
1881 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1882 | r1_bio->sector, | |
1883 | r1_bio->sectors, | |
1884 | &first_bad, &bad_sectors) | |
1885 | ) | |
4367af55 | 1886 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1887 | |
1da177e4 | 1888 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1889 | int s = r1_bio->sectors; |
d8f05d29 N |
1890 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1891 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1892 | reschedule_retry(r1_bio); |
1893 | else { | |
1894 | put_buf(r1_bio); | |
1895 | md_done_sync(mddev, s, uptodate); | |
1896 | } | |
1da177e4 | 1897 | } |
1da177e4 LT |
1898 | } |
1899 | ||
3cb03002 | 1900 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1901 | int sectors, struct page *page, int rw) |
1902 | { | |
796a5cf0 | 1903 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) |
d8f05d29 N |
1904 | /* success */ |
1905 | return 1; | |
19d67169 | 1906 | if (rw == WRITE) { |
d8f05d29 | 1907 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1908 | if (!test_and_set_bit(WantReplacement, |
1909 | &rdev->flags)) | |
1910 | set_bit(MD_RECOVERY_NEEDED, & | |
1911 | rdev->mddev->recovery); | |
1912 | } | |
d8f05d29 N |
1913 | /* need to record an error - either for the block or the device */ |
1914 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1915 | md_error(rdev->mddev, rdev); | |
1916 | return 0; | |
1917 | } | |
1918 | ||
9f2c9d12 | 1919 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1920 | { |
a68e5870 N |
1921 | /* Try some synchronous reads of other devices to get |
1922 | * good data, much like with normal read errors. Only | |
1923 | * read into the pages we already have so we don't | |
1924 | * need to re-issue the read request. | |
1925 | * We don't need to freeze the array, because being in an | |
1926 | * active sync request, there is no normal IO, and | |
1927 | * no overlapping syncs. | |
06f60385 N |
1928 | * We don't need to check is_badblock() again as we |
1929 | * made sure that anything with a bad block in range | |
1930 | * will have bi_end_io clear. | |
a68e5870 | 1931 | */ |
fd01b88c | 1932 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1933 | struct r1conf *conf = mddev->private; |
a68e5870 | 1934 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
44cf0f4d | 1935 | struct page **pages = get_resync_pages(bio)->pages; |
a68e5870 N |
1936 | sector_t sect = r1_bio->sector; |
1937 | int sectors = r1_bio->sectors; | |
1938 | int idx = 0; | |
2e52d449 N |
1939 | struct md_rdev *rdev; |
1940 | ||
1941 | rdev = conf->mirrors[r1_bio->read_disk].rdev; | |
1942 | if (test_bit(FailFast, &rdev->flags)) { | |
1943 | /* Don't try recovering from here - just fail it | |
1944 | * ... unless it is the last working device of course */ | |
1945 | md_error(mddev, rdev); | |
1946 | if (test_bit(Faulty, &rdev->flags)) | |
1947 | /* Don't try to read from here, but make sure | |
1948 | * put_buf does it's thing | |
1949 | */ | |
1950 | bio->bi_end_io = end_sync_write; | |
1951 | } | |
a68e5870 N |
1952 | |
1953 | while(sectors) { | |
1954 | int s = sectors; | |
1955 | int d = r1_bio->read_disk; | |
1956 | int success = 0; | |
78d7f5f7 | 1957 | int start; |
a68e5870 N |
1958 | |
1959 | if (s > (PAGE_SIZE>>9)) | |
1960 | s = PAGE_SIZE >> 9; | |
1961 | do { | |
1962 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1963 | /* No rcu protection needed here devices | |
1964 | * can only be removed when no resync is | |
1965 | * active, and resync is currently active | |
1966 | */ | |
1967 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1968 | if (sync_page_io(rdev, sect, s<<9, |
44cf0f4d | 1969 | pages[idx], |
796a5cf0 | 1970 | REQ_OP_READ, 0, false)) { |
a68e5870 N |
1971 | success = 1; |
1972 | break; | |
1973 | } | |
1974 | } | |
1975 | d++; | |
8f19ccb2 | 1976 | if (d == conf->raid_disks * 2) |
a68e5870 N |
1977 | d = 0; |
1978 | } while (!success && d != r1_bio->read_disk); | |
1979 | ||
78d7f5f7 | 1980 | if (!success) { |
a68e5870 | 1981 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1982 | int abort = 0; |
1983 | /* Cannot read from anywhere, this block is lost. | |
1984 | * Record a bad block on each device. If that doesn't | |
1985 | * work just disable and interrupt the recovery. | |
1986 | * Don't fail devices as that won't really help. | |
1987 | */ | |
1d41c216 | 1988 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
74d46992 | 1989 | mdname(mddev), bio_devname(bio, b), |
1d41c216 | 1990 | (unsigned long long)r1_bio->sector); |
8f19ccb2 | 1991 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
1992 | rdev = conf->mirrors[d].rdev; |
1993 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
1994 | continue; | |
1995 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1996 | abort = 1; | |
1997 | } | |
1998 | if (abort) { | |
d890fa2b N |
1999 | conf->recovery_disabled = |
2000 | mddev->recovery_disabled; | |
3a9f28a5 N |
2001 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
2002 | md_done_sync(mddev, r1_bio->sectors, 0); | |
2003 | put_buf(r1_bio); | |
2004 | return 0; | |
2005 | } | |
2006 | /* Try next page */ | |
2007 | sectors -= s; | |
2008 | sect += s; | |
2009 | idx++; | |
2010 | continue; | |
d11c171e | 2011 | } |
78d7f5f7 N |
2012 | |
2013 | start = d; | |
2014 | /* write it back and re-read */ | |
2015 | while (d != r1_bio->read_disk) { | |
2016 | if (d == 0) | |
8f19ccb2 | 2017 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2018 | d--; |
2019 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2020 | continue; | |
2021 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2022 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2023 | pages[idx], |
d8f05d29 | 2024 | WRITE) == 0) { |
78d7f5f7 N |
2025 | r1_bio->bios[d]->bi_end_io = NULL; |
2026 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 2027 | } |
78d7f5f7 N |
2028 | } |
2029 | d = start; | |
2030 | while (d != r1_bio->read_disk) { | |
2031 | if (d == 0) | |
8f19ccb2 | 2032 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2033 | d--; |
2034 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2035 | continue; | |
2036 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2037 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2038 | pages[idx], |
d8f05d29 | 2039 | READ) != 0) |
9d3d8011 | 2040 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 2041 | } |
a68e5870 N |
2042 | sectors -= s; |
2043 | sect += s; | |
2044 | idx ++; | |
2045 | } | |
78d7f5f7 | 2046 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
4e4cbee9 | 2047 | bio->bi_status = 0; |
a68e5870 N |
2048 | return 1; |
2049 | } | |
2050 | ||
c95e6385 | 2051 | static void process_checks(struct r1bio *r1_bio) |
a68e5870 N |
2052 | { |
2053 | /* We have read all readable devices. If we haven't | |
2054 | * got the block, then there is no hope left. | |
2055 | * If we have, then we want to do a comparison | |
2056 | * and skip the write if everything is the same. | |
2057 | * If any blocks failed to read, then we need to | |
2058 | * attempt an over-write | |
2059 | */ | |
fd01b88c | 2060 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2061 | struct r1conf *conf = mddev->private; |
a68e5870 N |
2062 | int primary; |
2063 | int i; | |
f4380a91 | 2064 | int vcnt; |
a68e5870 | 2065 | |
30bc9b53 N |
2066 | /* Fix variable parts of all bios */ |
2067 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); | |
2068 | for (i = 0; i < conf->raid_disks * 2; i++) { | |
4e4cbee9 | 2069 | blk_status_t status; |
30bc9b53 | 2070 | struct bio *b = r1_bio->bios[i]; |
98d30c58 | 2071 | struct resync_pages *rp = get_resync_pages(b); |
30bc9b53 N |
2072 | if (b->bi_end_io != end_sync_read) |
2073 | continue; | |
4246a0b6 | 2074 | /* fixup the bio for reuse, but preserve errno */ |
4e4cbee9 | 2075 | status = b->bi_status; |
30bc9b53 | 2076 | bio_reset(b); |
4e4cbee9 | 2077 | b->bi_status = status; |
4f024f37 | 2078 | b->bi_iter.bi_sector = r1_bio->sector + |
30bc9b53 | 2079 | conf->mirrors[i].rdev->data_offset; |
74d46992 | 2080 | bio_set_dev(b, conf->mirrors[i].rdev->bdev); |
30bc9b53 | 2081 | b->bi_end_io = end_sync_read; |
98d30c58 ML |
2082 | rp->raid_bio = r1_bio; |
2083 | b->bi_private = rp; | |
30bc9b53 | 2084 | |
fb0eb5df ML |
2085 | /* initialize bvec table again */ |
2086 | md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); | |
30bc9b53 | 2087 | } |
8f19ccb2 | 2088 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 | 2089 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
4e4cbee9 | 2090 | !r1_bio->bios[primary]->bi_status) { |
a68e5870 N |
2091 | r1_bio->bios[primary]->bi_end_io = NULL; |
2092 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
2093 | break; | |
2094 | } | |
2095 | r1_bio->read_disk = primary; | |
8f19ccb2 | 2096 | for (i = 0; i < conf->raid_disks * 2; i++) { |
78d7f5f7 | 2097 | int j; |
78d7f5f7 N |
2098 | struct bio *pbio = r1_bio->bios[primary]; |
2099 | struct bio *sbio = r1_bio->bios[i]; | |
4e4cbee9 | 2100 | blk_status_t status = sbio->bi_status; |
44cf0f4d ML |
2101 | struct page **ppages = get_resync_pages(pbio)->pages; |
2102 | struct page **spages = get_resync_pages(sbio)->pages; | |
60928a91 | 2103 | struct bio_vec *bi; |
8fc04e6e | 2104 | int page_len[RESYNC_PAGES] = { 0 }; |
a68e5870 | 2105 | |
2aabaa65 | 2106 | if (sbio->bi_end_io != end_sync_read) |
78d7f5f7 | 2107 | continue; |
4246a0b6 | 2108 | /* Now we can 'fixup' the error value */ |
4e4cbee9 | 2109 | sbio->bi_status = 0; |
78d7f5f7 | 2110 | |
60928a91 ML |
2111 | bio_for_each_segment_all(bi, sbio, j) |
2112 | page_len[j] = bi->bv_len; | |
2113 | ||
4e4cbee9 | 2114 | if (!status) { |
78d7f5f7 | 2115 | for (j = vcnt; j-- ; ) { |
44cf0f4d ML |
2116 | if (memcmp(page_address(ppages[j]), |
2117 | page_address(spages[j]), | |
60928a91 | 2118 | page_len[j])) |
78d7f5f7 | 2119 | break; |
69382e85 | 2120 | } |
78d7f5f7 N |
2121 | } else |
2122 | j = 0; | |
2123 | if (j >= 0) | |
7f7583d4 | 2124 | atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
78d7f5f7 | 2125 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
4e4cbee9 | 2126 | && !status)) { |
78d7f5f7 N |
2127 | /* No need to write to this device. */ |
2128 | sbio->bi_end_io = NULL; | |
2129 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
2130 | continue; | |
2131 | } | |
d3b45c2a KO |
2132 | |
2133 | bio_copy_data(sbio, pbio); | |
78d7f5f7 | 2134 | } |
a68e5870 N |
2135 | } |
2136 | ||
9f2c9d12 | 2137 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 2138 | { |
e8096360 | 2139 | struct r1conf *conf = mddev->private; |
a68e5870 | 2140 | int i; |
8f19ccb2 | 2141 | int disks = conf->raid_disks * 2; |
037d2ff6 | 2142 | struct bio *wbio; |
a68e5870 | 2143 | |
a68e5870 N |
2144 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
2145 | /* ouch - failed to read all of that. */ | |
2146 | if (!fix_sync_read_error(r1_bio)) | |
2147 | return; | |
7ca78d57 N |
2148 | |
2149 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
c95e6385 N |
2150 | process_checks(r1_bio); |
2151 | ||
d11c171e N |
2152 | /* |
2153 | * schedule writes | |
2154 | */ | |
1da177e4 LT |
2155 | atomic_set(&r1_bio->remaining, 1); |
2156 | for (i = 0; i < disks ; i++) { | |
2157 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
2158 | if (wbio->bi_end_io == NULL || |
2159 | (wbio->bi_end_io == end_sync_read && | |
2160 | (i == r1_bio->read_disk || | |
2161 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 | 2162 | continue; |
0c9d5b12 N |
2163 | if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) |
2164 | continue; | |
1da177e4 | 2165 | |
796a5cf0 | 2166 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
212e7eb7 N |
2167 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) |
2168 | wbio->bi_opf |= MD_FAILFAST; | |
2169 | ||
3e198f78 | 2170 | wbio->bi_end_io = end_sync_write; |
1da177e4 | 2171 | atomic_inc(&r1_bio->remaining); |
aa8b57aa | 2172 | md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); |
191ea9b2 | 2173 | |
1da177e4 LT |
2174 | generic_make_request(wbio); |
2175 | } | |
2176 | ||
2177 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 2178 | /* if we're here, all write(s) have completed, so clean up */ |
58e94ae1 N |
2179 | int s = r1_bio->sectors; |
2180 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
2181 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2182 | reschedule_retry(r1_bio); | |
2183 | else { | |
2184 | put_buf(r1_bio); | |
2185 | md_done_sync(mddev, s, 1); | |
2186 | } | |
1da177e4 LT |
2187 | } |
2188 | } | |
2189 | ||
2190 | /* | |
2191 | * This is a kernel thread which: | |
2192 | * | |
2193 | * 1. Retries failed read operations on working mirrors. | |
2194 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 2195 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
2196 | */ |
2197 | ||
e8096360 | 2198 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
2199 | sector_t sect, int sectors) |
2200 | { | |
fd01b88c | 2201 | struct mddev *mddev = conf->mddev; |
867868fb N |
2202 | while(sectors) { |
2203 | int s = sectors; | |
2204 | int d = read_disk; | |
2205 | int success = 0; | |
2206 | int start; | |
3cb03002 | 2207 | struct md_rdev *rdev; |
867868fb N |
2208 | |
2209 | if (s > (PAGE_SIZE>>9)) | |
2210 | s = PAGE_SIZE >> 9; | |
2211 | ||
2212 | do { | |
d2eb35ac N |
2213 | sector_t first_bad; |
2214 | int bad_sectors; | |
2215 | ||
707a6a42 N |
2216 | rcu_read_lock(); |
2217 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2218 | if (rdev && |
da8840a7 | 2219 | (test_bit(In_sync, &rdev->flags) || |
2220 | (!test_bit(Faulty, &rdev->flags) && | |
2221 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac | 2222 | is_badblock(rdev, sect, s, |
707a6a42 N |
2223 | &first_bad, &bad_sectors) == 0) { |
2224 | atomic_inc(&rdev->nr_pending); | |
2225 | rcu_read_unlock(); | |
2226 | if (sync_page_io(rdev, sect, s<<9, | |
796a5cf0 | 2227 | conf->tmppage, REQ_OP_READ, 0, false)) |
707a6a42 N |
2228 | success = 1; |
2229 | rdev_dec_pending(rdev, mddev); | |
2230 | if (success) | |
2231 | break; | |
2232 | } else | |
2233 | rcu_read_unlock(); | |
2234 | d++; | |
2235 | if (d == conf->raid_disks * 2) | |
2236 | d = 0; | |
867868fb N |
2237 | } while (!success && d != read_disk); |
2238 | ||
2239 | if (!success) { | |
d8f05d29 | 2240 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 2241 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
2242 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
2243 | md_error(mddev, rdev); | |
867868fb N |
2244 | break; |
2245 | } | |
2246 | /* write it back and re-read */ | |
2247 | start = d; | |
2248 | while (d != read_disk) { | |
2249 | if (d==0) | |
8f19ccb2 | 2250 | d = conf->raid_disks * 2; |
867868fb | 2251 | d--; |
707a6a42 N |
2252 | rcu_read_lock(); |
2253 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2254 | if (rdev && |
707a6a42 N |
2255 | !test_bit(Faulty, &rdev->flags)) { |
2256 | atomic_inc(&rdev->nr_pending); | |
2257 | rcu_read_unlock(); | |
d8f05d29 N |
2258 | r1_sync_page_io(rdev, sect, s, |
2259 | conf->tmppage, WRITE); | |
707a6a42 N |
2260 | rdev_dec_pending(rdev, mddev); |
2261 | } else | |
2262 | rcu_read_unlock(); | |
867868fb N |
2263 | } |
2264 | d = start; | |
2265 | while (d != read_disk) { | |
2266 | char b[BDEVNAME_SIZE]; | |
2267 | if (d==0) | |
8f19ccb2 | 2268 | d = conf->raid_disks * 2; |
867868fb | 2269 | d--; |
707a6a42 N |
2270 | rcu_read_lock(); |
2271 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2272 | if (rdev && |
b8cb6b4c | 2273 | !test_bit(Faulty, &rdev->flags)) { |
707a6a42 N |
2274 | atomic_inc(&rdev->nr_pending); |
2275 | rcu_read_unlock(); | |
d8f05d29 N |
2276 | if (r1_sync_page_io(rdev, sect, s, |
2277 | conf->tmppage, READ)) { | |
867868fb | 2278 | atomic_add(s, &rdev->corrected_errors); |
1d41c216 N |
2279 | pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", |
2280 | mdname(mddev), s, | |
2281 | (unsigned long long)(sect + | |
2282 | rdev->data_offset), | |
2283 | bdevname(rdev->bdev, b)); | |
867868fb | 2284 | } |
707a6a42 N |
2285 | rdev_dec_pending(rdev, mddev); |
2286 | } else | |
2287 | rcu_read_unlock(); | |
867868fb N |
2288 | } |
2289 | sectors -= s; | |
2290 | sect += s; | |
2291 | } | |
2292 | } | |
2293 | ||
9f2c9d12 | 2294 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 2295 | { |
fd01b88c | 2296 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2297 | struct r1conf *conf = mddev->private; |
3cb03002 | 2298 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
2299 | |
2300 | /* bio has the data to be written to device 'i' where | |
2301 | * we just recently had a write error. | |
2302 | * We repeatedly clone the bio and trim down to one block, | |
2303 | * then try the write. Where the write fails we record | |
2304 | * a bad block. | |
2305 | * It is conceivable that the bio doesn't exactly align with | |
2306 | * blocks. We must handle this somehow. | |
2307 | * | |
2308 | * We currently own a reference on the rdev. | |
2309 | */ | |
2310 | ||
2311 | int block_sectors; | |
2312 | sector_t sector; | |
2313 | int sectors; | |
2314 | int sect_to_write = r1_bio->sectors; | |
2315 | int ok = 1; | |
2316 | ||
2317 | if (rdev->badblocks.shift < 0) | |
2318 | return 0; | |
2319 | ||
ab713cdc ND |
2320 | block_sectors = roundup(1 << rdev->badblocks.shift, |
2321 | bdev_logical_block_size(rdev->bdev) >> 9); | |
cd5ff9a1 N |
2322 | sector = r1_bio->sector; |
2323 | sectors = ((sector + block_sectors) | |
2324 | & ~(sector_t)(block_sectors - 1)) | |
2325 | - sector; | |
2326 | ||
cd5ff9a1 N |
2327 | while (sect_to_write) { |
2328 | struct bio *wbio; | |
2329 | if (sectors > sect_to_write) | |
2330 | sectors = sect_to_write; | |
2331 | /* Write at 'sector' for 'sectors'*/ | |
2332 | ||
b783863f | 2333 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
841c1316 ML |
2334 | wbio = bio_clone_fast(r1_bio->behind_master_bio, |
2335 | GFP_NOIO, | |
2336 | mddev->bio_set); | |
b783863f | 2337 | } else { |
d7a10308 ML |
2338 | wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, |
2339 | mddev->bio_set); | |
b783863f KO |
2340 | } |
2341 | ||
796a5cf0 | 2342 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
4f024f37 KO |
2343 | wbio->bi_iter.bi_sector = r1_bio->sector; |
2344 | wbio->bi_iter.bi_size = r1_bio->sectors << 9; | |
cd5ff9a1 | 2345 | |
6678d83f | 2346 | bio_trim(wbio, sector - r1_bio->sector, sectors); |
4f024f37 | 2347 | wbio->bi_iter.bi_sector += rdev->data_offset; |
74d46992 | 2348 | bio_set_dev(wbio, rdev->bdev); |
4e49ea4a MC |
2349 | |
2350 | if (submit_bio_wait(wbio) < 0) | |
cd5ff9a1 N |
2351 | /* failure! */ |
2352 | ok = rdev_set_badblocks(rdev, sector, | |
2353 | sectors, 0) | |
2354 | && ok; | |
2355 | ||
2356 | bio_put(wbio); | |
2357 | sect_to_write -= sectors; | |
2358 | sector += sectors; | |
2359 | sectors = block_sectors; | |
2360 | } | |
2361 | return ok; | |
2362 | } | |
2363 | ||
e8096360 | 2364 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2365 | { |
2366 | int m; | |
2367 | int s = r1_bio->sectors; | |
8f19ccb2 | 2368 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2369 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2370 | struct bio *bio = r1_bio->bios[m]; |
2371 | if (bio->bi_end_io == NULL) | |
2372 | continue; | |
4e4cbee9 | 2373 | if (!bio->bi_status && |
62096bce | 2374 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { |
c6563a8c | 2375 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce | 2376 | } |
4e4cbee9 | 2377 | if (bio->bi_status && |
62096bce N |
2378 | test_bit(R1BIO_WriteError, &r1_bio->state)) { |
2379 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2380 | md_error(conf->mddev, rdev); | |
2381 | } | |
2382 | } | |
2383 | put_buf(r1_bio); | |
2384 | md_done_sync(conf->mddev, s, 1); | |
2385 | } | |
2386 | ||
e8096360 | 2387 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2388 | { |
fd76863e | 2389 | int m, idx; |
55ce74d4 | 2390 | bool fail = false; |
fd76863e | 2391 | |
8f19ccb2 | 2392 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2393 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2394 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2395 | rdev_clear_badblocks(rdev, |
2396 | r1_bio->sector, | |
c6563a8c | 2397 | r1_bio->sectors, 0); |
62096bce N |
2398 | rdev_dec_pending(rdev, conf->mddev); |
2399 | } else if (r1_bio->bios[m] != NULL) { | |
2400 | /* This drive got a write error. We need to | |
2401 | * narrow down and record precise write | |
2402 | * errors. | |
2403 | */ | |
55ce74d4 | 2404 | fail = true; |
62096bce N |
2405 | if (!narrow_write_error(r1_bio, m)) { |
2406 | md_error(conf->mddev, | |
2407 | conf->mirrors[m].rdev); | |
2408 | /* an I/O failed, we can't clear the bitmap */ | |
2409 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2410 | } | |
2411 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2412 | conf->mddev); | |
2413 | } | |
55ce74d4 N |
2414 | if (fail) { |
2415 | spin_lock_irq(&conf->device_lock); | |
2416 | list_add(&r1_bio->retry_list, &conf->bio_end_io_list); | |
fd76863e | 2417 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2418 | atomic_inc(&conf->nr_queued[idx]); |
55ce74d4 | 2419 | spin_unlock_irq(&conf->device_lock); |
824e47da | 2420 | /* |
2421 | * In case freeze_array() is waiting for condition | |
2422 | * get_unqueued_pending() == extra to be true. | |
2423 | */ | |
2424 | wake_up(&conf->wait_barrier); | |
55ce74d4 | 2425 | md_wakeup_thread(conf->mddev->thread); |
bd8688a1 N |
2426 | } else { |
2427 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2428 | close_write(r1_bio); | |
55ce74d4 | 2429 | raid_end_bio_io(r1_bio); |
bd8688a1 | 2430 | } |
62096bce N |
2431 | } |
2432 | ||
e8096360 | 2433 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2434 | { |
fd01b88c | 2435 | struct mddev *mddev = conf->mddev; |
62096bce | 2436 | struct bio *bio; |
3cb03002 | 2437 | struct md_rdev *rdev; |
109e3765 | 2438 | sector_t bio_sector; |
62096bce N |
2439 | |
2440 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2441 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2442 | * the block and we can fix it. | |
2443 | * We freeze all other IO, and try reading the block from | |
2444 | * other devices. When we find one, we re-write | |
2445 | * and check it that fixes the read error. | |
2446 | * This is all done synchronously while the array is | |
2447 | * frozen | |
2448 | */ | |
7449f699 TM |
2449 | |
2450 | bio = r1_bio->bios[r1_bio->read_disk]; | |
109e3765 | 2451 | bio_sector = conf->mirrors[r1_bio->read_disk].rdev->data_offset + r1_bio->sector; |
7449f699 TM |
2452 | bio_put(bio); |
2453 | r1_bio->bios[r1_bio->read_disk] = NULL; | |
2454 | ||
2e52d449 N |
2455 | rdev = conf->mirrors[r1_bio->read_disk].rdev; |
2456 | if (mddev->ro == 0 | |
2457 | && !test_bit(FailFast, &rdev->flags)) { | |
e2d59925 | 2458 | freeze_array(conf, 1); |
62096bce N |
2459 | fix_read_error(conf, r1_bio->read_disk, |
2460 | r1_bio->sector, r1_bio->sectors); | |
2461 | unfreeze_array(conf); | |
7449f699 TM |
2462 | } else { |
2463 | r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; | |
2464 | } | |
2465 | ||
2e52d449 | 2466 | rdev_dec_pending(rdev, conf->mddev); |
689389a0 N |
2467 | allow_barrier(conf, r1_bio->sector); |
2468 | bio = r1_bio->master_bio; | |
62096bce | 2469 | |
689389a0 N |
2470 | /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ |
2471 | r1_bio->state = 0; | |
2472 | raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); | |
62096bce N |
2473 | } |
2474 | ||
4ed8731d | 2475 | static void raid1d(struct md_thread *thread) |
1da177e4 | 2476 | { |
4ed8731d | 2477 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2478 | struct r1bio *r1_bio; |
1da177e4 | 2479 | unsigned long flags; |
e8096360 | 2480 | struct r1conf *conf = mddev->private; |
1da177e4 | 2481 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2482 | struct blk_plug plug; |
fd76863e | 2483 | int idx; |
1da177e4 LT |
2484 | |
2485 | md_check_recovery(mddev); | |
e1dfa0a2 | 2486 | |
55ce74d4 | 2487 | if (!list_empty_careful(&conf->bio_end_io_list) && |
2953079c | 2488 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
55ce74d4 N |
2489 | LIST_HEAD(tmp); |
2490 | spin_lock_irqsave(&conf->device_lock, flags); | |
fd76863e | 2491 | if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
2492 | list_splice_init(&conf->bio_end_io_list, &tmp); | |
55ce74d4 N |
2493 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2494 | while (!list_empty(&tmp)) { | |
a452744b MP |
2495 | r1_bio = list_first_entry(&tmp, struct r1bio, |
2496 | retry_list); | |
55ce74d4 | 2497 | list_del(&r1_bio->retry_list); |
fd76863e | 2498 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2499 | atomic_dec(&conf->nr_queued[idx]); |
bd8688a1 N |
2500 | if (mddev->degraded) |
2501 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2502 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2503 | close_write(r1_bio); | |
55ce74d4 N |
2504 | raid_end_bio_io(r1_bio); |
2505 | } | |
2506 | } | |
2507 | ||
e1dfa0a2 | 2508 | blk_start_plug(&plug); |
1da177e4 | 2509 | for (;;) { |
191ea9b2 | 2510 | |
0021b7bc | 2511 | flush_pending_writes(conf); |
191ea9b2 | 2512 | |
a35e63ef N |
2513 | spin_lock_irqsave(&conf->device_lock, flags); |
2514 | if (list_empty(head)) { | |
2515 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2516 | break; |
a35e63ef | 2517 | } |
9f2c9d12 | 2518 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2519 | list_del(head->prev); |
fd76863e | 2520 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2521 | atomic_dec(&conf->nr_queued[idx]); |
1da177e4 LT |
2522 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2523 | ||
2524 | mddev = r1_bio->mddev; | |
070ec55d | 2525 | conf = mddev->private; |
4367af55 | 2526 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2527 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2528 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2529 | handle_sync_write_finished(conf, r1_bio); | |
2530 | else | |
4367af55 | 2531 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2532 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2533 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2534 | handle_write_finished(conf, r1_bio); | |
2535 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2536 | handle_read_error(conf, r1_bio); | |
2537 | else | |
c230e7e5 | 2538 | WARN_ON_ONCE(1); |
62096bce | 2539 | |
1d9d5241 | 2540 | cond_resched(); |
2953079c | 2541 | if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) |
de393cde | 2542 | md_check_recovery(mddev); |
1da177e4 | 2543 | } |
e1dfa0a2 | 2544 | blk_finish_plug(&plug); |
1da177e4 LT |
2545 | } |
2546 | ||
e8096360 | 2547 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2548 | { |
2549 | int buffs; | |
2550 | ||
2551 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2552 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2553 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2554 | conf->poolinfo); | |
2555 | if (!conf->r1buf_pool) | |
2556 | return -ENOMEM; | |
1da177e4 LT |
2557 | return 0; |
2558 | } | |
2559 | ||
208410b5 SL |
2560 | static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf) |
2561 | { | |
2562 | struct r1bio *r1bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); | |
2563 | struct resync_pages *rps; | |
2564 | struct bio *bio; | |
2565 | int i; | |
2566 | ||
2567 | for (i = conf->poolinfo->raid_disks; i--; ) { | |
2568 | bio = r1bio->bios[i]; | |
2569 | rps = bio->bi_private; | |
2570 | bio_reset(bio); | |
2571 | bio->bi_private = rps; | |
2572 | } | |
2573 | r1bio->master_bio = NULL; | |
2574 | return r1bio; | |
2575 | } | |
2576 | ||
1da177e4 LT |
2577 | /* |
2578 | * perform a "sync" on one "block" | |
2579 | * | |
2580 | * We need to make sure that no normal I/O request - particularly write | |
2581 | * requests - conflict with active sync requests. | |
2582 | * | |
2583 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2584 | * that can be installed to exclude normal IO requests. | |
2585 | */ | |
2586 | ||
849674e4 SL |
2587 | static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, |
2588 | int *skipped) | |
1da177e4 | 2589 | { |
e8096360 | 2590 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2591 | struct r1bio *r1_bio; |
1da177e4 LT |
2592 | struct bio *bio; |
2593 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2594 | int disk = -1; |
1da177e4 | 2595 | int i; |
3e198f78 N |
2596 | int wonly = -1; |
2597 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2598 | sector_t sync_blocks; |
e3b9703e | 2599 | int still_degraded = 0; |
06f60385 N |
2600 | int good_sectors = RESYNC_SECTORS; |
2601 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
fd76863e | 2602 | int idx = sector_to_idx(sector_nr); |
022e510f | 2603 | int page_idx = 0; |
1da177e4 LT |
2604 | |
2605 | if (!conf->r1buf_pool) | |
2606 | if (init_resync(conf)) | |
57afd89f | 2607 | return 0; |
1da177e4 | 2608 | |
58c0fed4 | 2609 | max_sector = mddev->dev_sectors; |
1da177e4 | 2610 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2611 | /* If we aborted, we need to abort the |
2612 | * sync on the 'current' bitmap chunk (there will | |
2613 | * only be one in raid1 resync. | |
2614 | * We can find the current addess in mddev->curr_resync | |
2615 | */ | |
6a806c51 N |
2616 | if (mddev->curr_resync < max_sector) /* aborted */ |
2617 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2618 | &sync_blocks, 1); |
6a806c51 | 2619 | else /* completed sync */ |
191ea9b2 | 2620 | conf->fullsync = 0; |
6a806c51 N |
2621 | |
2622 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 | 2623 | close_sync(conf); |
c40f341f GR |
2624 | |
2625 | if (mddev_is_clustered(mddev)) { | |
2626 | conf->cluster_sync_low = 0; | |
2627 | conf->cluster_sync_high = 0; | |
c40f341f | 2628 | } |
1da177e4 LT |
2629 | return 0; |
2630 | } | |
2631 | ||
07d84d10 N |
2632 | if (mddev->bitmap == NULL && |
2633 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2634 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2635 | conf->fullsync == 0) { |
2636 | *skipped = 1; | |
2637 | return max_sector - sector_nr; | |
2638 | } | |
6394cca5 N |
2639 | /* before building a request, check if we can skip these blocks.. |
2640 | * This call the bitmap_start_sync doesn't actually record anything | |
2641 | */ | |
e3b9703e | 2642 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2643 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2644 | /* We can skip this block, and probably several more */ |
2645 | *skipped = 1; | |
2646 | return sync_blocks; | |
2647 | } | |
17999be4 | 2648 | |
7ac50447 TM |
2649 | /* |
2650 | * If there is non-resync activity waiting for a turn, then let it | |
2651 | * though before starting on this new sync request. | |
2652 | */ | |
824e47da | 2653 | if (atomic_read(&conf->nr_waiting[idx])) |
7ac50447 TM |
2654 | schedule_timeout_uninterruptible(1); |
2655 | ||
c40f341f GR |
2656 | /* we are incrementing sector_nr below. To be safe, we check against |
2657 | * sector_nr + two times RESYNC_SECTORS | |
2658 | */ | |
2659 | ||
2660 | bitmap_cond_end_sync(mddev->bitmap, sector_nr, | |
2661 | mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); | |
208410b5 | 2662 | r1_bio = raid1_alloc_init_r1buf(conf); |
17999be4 | 2663 | |
c2fd4c94 | 2664 | raise_barrier(conf, sector_nr); |
1da177e4 | 2665 | |
3e198f78 | 2666 | rcu_read_lock(); |
1da177e4 | 2667 | /* |
3e198f78 N |
2668 | * If we get a correctably read error during resync or recovery, |
2669 | * we might want to read from a different device. So we | |
2670 | * flag all drives that could conceivably be read from for READ, | |
2671 | * and any others (which will be non-In_sync devices) for WRITE. | |
2672 | * If a read fails, we try reading from something else for which READ | |
2673 | * is OK. | |
1da177e4 | 2674 | */ |
1da177e4 | 2675 | |
1da177e4 LT |
2676 | r1_bio->mddev = mddev; |
2677 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2678 | r1_bio->state = 0; |
1da177e4 | 2679 | set_bit(R1BIO_IsSync, &r1_bio->state); |
fd76863e | 2680 | /* make sure good_sectors won't go across barrier unit boundary */ |
2681 | good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); | |
1da177e4 | 2682 | |
8f19ccb2 | 2683 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 2684 | struct md_rdev *rdev; |
1da177e4 | 2685 | bio = r1_bio->bios[i]; |
1da177e4 | 2686 | |
3e198f78 N |
2687 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2688 | if (rdev == NULL || | |
06f60385 | 2689 | test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
2690 | if (i < conf->raid_disks) |
2691 | still_degraded = 1; | |
3e198f78 | 2692 | } else if (!test_bit(In_sync, &rdev->flags)) { |
796a5cf0 | 2693 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
1da177e4 LT |
2694 | bio->bi_end_io = end_sync_write; |
2695 | write_targets ++; | |
3e198f78 N |
2696 | } else { |
2697 | /* may need to read from here */ | |
06f60385 N |
2698 | sector_t first_bad = MaxSector; |
2699 | int bad_sectors; | |
2700 | ||
2701 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2702 | &first_bad, &bad_sectors)) { | |
2703 | if (first_bad > sector_nr) | |
2704 | good_sectors = first_bad - sector_nr; | |
2705 | else { | |
2706 | bad_sectors -= (sector_nr - first_bad); | |
2707 | if (min_bad == 0 || | |
2708 | min_bad > bad_sectors) | |
2709 | min_bad = bad_sectors; | |
2710 | } | |
2711 | } | |
2712 | if (sector_nr < first_bad) { | |
2713 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2714 | if (wonly < 0) | |
2715 | wonly = i; | |
2716 | } else { | |
2717 | if (disk < 0) | |
2718 | disk = i; | |
2719 | } | |
796a5cf0 | 2720 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
06f60385 N |
2721 | bio->bi_end_io = end_sync_read; |
2722 | read_targets++; | |
d57368af AL |
2723 | } else if (!test_bit(WriteErrorSeen, &rdev->flags) && |
2724 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
2725 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { | |
2726 | /* | |
2727 | * The device is suitable for reading (InSync), | |
2728 | * but has bad block(s) here. Let's try to correct them, | |
2729 | * if we are doing resync or repair. Otherwise, leave | |
2730 | * this device alone for this sync request. | |
2731 | */ | |
796a5cf0 | 2732 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
d57368af AL |
2733 | bio->bi_end_io = end_sync_write; |
2734 | write_targets++; | |
3e198f78 | 2735 | } |
3e198f78 | 2736 | } |
06f60385 N |
2737 | if (bio->bi_end_io) { |
2738 | atomic_inc(&rdev->nr_pending); | |
4f024f37 | 2739 | bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; |
74d46992 | 2740 | bio_set_dev(bio, rdev->bdev); |
2e52d449 N |
2741 | if (test_bit(FailFast, &rdev->flags)) |
2742 | bio->bi_opf |= MD_FAILFAST; | |
06f60385 | 2743 | } |
1da177e4 | 2744 | } |
3e198f78 N |
2745 | rcu_read_unlock(); |
2746 | if (disk < 0) | |
2747 | disk = wonly; | |
2748 | r1_bio->read_disk = disk; | |
191ea9b2 | 2749 | |
06f60385 N |
2750 | if (read_targets == 0 && min_bad > 0) { |
2751 | /* These sectors are bad on all InSync devices, so we | |
2752 | * need to mark them bad on all write targets | |
2753 | */ | |
2754 | int ok = 1; | |
8f19ccb2 | 2755 | for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
06f60385 | 2756 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
a42f9d83 | 2757 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
06f60385 N |
2758 | ok = rdev_set_badblocks(rdev, sector_nr, |
2759 | min_bad, 0 | |
2760 | ) && ok; | |
2761 | } | |
2953079c | 2762 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
06f60385 N |
2763 | *skipped = 1; |
2764 | put_buf(r1_bio); | |
2765 | ||
2766 | if (!ok) { | |
2767 | /* Cannot record the badblocks, so need to | |
2768 | * abort the resync. | |
2769 | * If there are multiple read targets, could just | |
2770 | * fail the really bad ones ??? | |
2771 | */ | |
2772 | conf->recovery_disabled = mddev->recovery_disabled; | |
2773 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2774 | return 0; | |
2775 | } else | |
2776 | return min_bad; | |
2777 | ||
2778 | } | |
2779 | if (min_bad > 0 && min_bad < good_sectors) { | |
2780 | /* only resync enough to reach the next bad->good | |
2781 | * transition */ | |
2782 | good_sectors = min_bad; | |
2783 | } | |
2784 | ||
3e198f78 N |
2785 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2786 | /* extra read targets are also write targets */ | |
2787 | write_targets += read_targets-1; | |
2788 | ||
2789 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2790 | /* There is nowhere to write, so all non-sync |
2791 | * drives must be failed - so we are finished | |
2792 | */ | |
b7219ccb N |
2793 | sector_t rv; |
2794 | if (min_bad > 0) | |
2795 | max_sector = sector_nr + min_bad; | |
2796 | rv = max_sector - sector_nr; | |
57afd89f | 2797 | *skipped = 1; |
1da177e4 | 2798 | put_buf(r1_bio); |
1da177e4 LT |
2799 | return rv; |
2800 | } | |
2801 | ||
c6207277 N |
2802 | if (max_sector > mddev->resync_max) |
2803 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2804 | if (max_sector > sector_nr + good_sectors) |
2805 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2806 | nr_sectors = 0; |
289e99e8 | 2807 | sync_blocks = 0; |
1da177e4 LT |
2808 | do { |
2809 | struct page *page; | |
2810 | int len = PAGE_SIZE; | |
2811 | if (sector_nr + (len>>9) > max_sector) | |
2812 | len = (max_sector - sector_nr) << 9; | |
2813 | if (len == 0) | |
2814 | break; | |
6a806c51 N |
2815 | if (sync_blocks == 0) { |
2816 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
2817 | &sync_blocks, still_degraded) && |
2818 | !conf->fullsync && | |
2819 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2820 | break; |
7571ae88 | 2821 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2822 | len = sync_blocks<<9; |
ab7a30c7 | 2823 | } |
191ea9b2 | 2824 | |
8f19ccb2 | 2825 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
98d30c58 ML |
2826 | struct resync_pages *rp; |
2827 | ||
1da177e4 | 2828 | bio = r1_bio->bios[i]; |
98d30c58 | 2829 | rp = get_resync_pages(bio); |
1da177e4 | 2830 | if (bio->bi_end_io) { |
022e510f | 2831 | page = resync_fetch_page(rp, page_idx); |
c85ba149 ML |
2832 | |
2833 | /* | |
2834 | * won't fail because the vec table is big | |
2835 | * enough to hold all these pages | |
2836 | */ | |
2837 | bio_add_page(bio, page, len, 0); | |
1da177e4 LT |
2838 | } |
2839 | } | |
2840 | nr_sectors += len>>9; | |
2841 | sector_nr += len>>9; | |
191ea9b2 | 2842 | sync_blocks -= (len>>9); |
022e510f | 2843 | } while (++page_idx < RESYNC_PAGES); |
98d30c58 | 2844 | |
1da177e4 LT |
2845 | r1_bio->sectors = nr_sectors; |
2846 | ||
c40f341f GR |
2847 | if (mddev_is_clustered(mddev) && |
2848 | conf->cluster_sync_high < sector_nr + nr_sectors) { | |
2849 | conf->cluster_sync_low = mddev->curr_resync_completed; | |
2850 | conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; | |
2851 | /* Send resync message */ | |
2852 | md_cluster_ops->resync_info_update(mddev, | |
2853 | conf->cluster_sync_low, | |
2854 | conf->cluster_sync_high); | |
2855 | } | |
2856 | ||
d11c171e N |
2857 | /* For a user-requested sync, we read all readable devices and do a |
2858 | * compare | |
2859 | */ | |
2860 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2861 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2862 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2863 | bio = r1_bio->bios[i]; |
2864 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2865 | read_targets--; |
74d46992 | 2866 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2867 | if (read_targets == 1) |
2868 | bio->bi_opf &= ~MD_FAILFAST; | |
d11c171e N |
2869 | generic_make_request(bio); |
2870 | } | |
2871 | } | |
2872 | } else { | |
2873 | atomic_set(&r1_bio->remaining, 1); | |
2874 | bio = r1_bio->bios[r1_bio->read_disk]; | |
74d46992 | 2875 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2876 | if (read_targets == 1) |
2877 | bio->bi_opf &= ~MD_FAILFAST; | |
d11c171e | 2878 | generic_make_request(bio); |
1da177e4 | 2879 | |
d11c171e | 2880 | } |
1da177e4 LT |
2881 | return nr_sectors; |
2882 | } | |
2883 | ||
fd01b88c | 2884 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2885 | { |
2886 | if (sectors) | |
2887 | return sectors; | |
2888 | ||
2889 | return mddev->dev_sectors; | |
2890 | } | |
2891 | ||
e8096360 | 2892 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2893 | { |
e8096360 | 2894 | struct r1conf *conf; |
709ae487 | 2895 | int i; |
0eaf822c | 2896 | struct raid1_info *disk; |
3cb03002 | 2897 | struct md_rdev *rdev; |
709ae487 | 2898 | int err = -ENOMEM; |
1da177e4 | 2899 | |
e8096360 | 2900 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2901 | if (!conf) |
709ae487 | 2902 | goto abort; |
1da177e4 | 2903 | |
fd76863e | 2904 | conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, |
824e47da | 2905 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2906 | if (!conf->nr_pending) |
2907 | goto abort; | |
2908 | ||
2909 | conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2910 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2911 | if (!conf->nr_waiting) |
2912 | goto abort; | |
2913 | ||
2914 | conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2915 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2916 | if (!conf->nr_queued) |
2917 | goto abort; | |
2918 | ||
2919 | conf->barrier = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2920 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2921 | if (!conf->barrier) |
2922 | goto abort; | |
2923 | ||
0eaf822c | 2924 | conf->mirrors = kzalloc(sizeof(struct raid1_info) |
8f19ccb2 | 2925 | * mddev->raid_disks * 2, |
1da177e4 LT |
2926 | GFP_KERNEL); |
2927 | if (!conf->mirrors) | |
709ae487 | 2928 | goto abort; |
1da177e4 | 2929 | |
ddaf22ab N |
2930 | conf->tmppage = alloc_page(GFP_KERNEL); |
2931 | if (!conf->tmppage) | |
709ae487 | 2932 | goto abort; |
ddaf22ab | 2933 | |
709ae487 | 2934 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2935 | if (!conf->poolinfo) |
709ae487 | 2936 | goto abort; |
8f19ccb2 | 2937 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
1da177e4 LT |
2938 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, |
2939 | r1bio_pool_free, | |
2940 | conf->poolinfo); | |
2941 | if (!conf->r1bio_pool) | |
709ae487 N |
2942 | goto abort; |
2943 | ||
011067b0 | 2944 | conf->bio_split = bioset_create(BIO_POOL_SIZE, 0, 0); |
c230e7e5 N |
2945 | if (!conf->bio_split) |
2946 | goto abort; | |
2947 | ||
ed9bfdf1 | 2948 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2949 | |
c19d5798 | 2950 | err = -EINVAL; |
e7e72bf6 | 2951 | spin_lock_init(&conf->device_lock); |
dafb20fa | 2952 | rdev_for_each(rdev, mddev) { |
709ae487 | 2953 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2954 | if (disk_idx >= mddev->raid_disks |
2955 | || disk_idx < 0) | |
2956 | continue; | |
c19d5798 | 2957 | if (test_bit(Replacement, &rdev->flags)) |
02b898f2 | 2958 | disk = conf->mirrors + mddev->raid_disks + disk_idx; |
c19d5798 N |
2959 | else |
2960 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 2961 | |
c19d5798 N |
2962 | if (disk->rdev) |
2963 | goto abort; | |
1da177e4 | 2964 | disk->rdev = rdev; |
1da177e4 | 2965 | disk->head_position = 0; |
12cee5a8 | 2966 | disk->seq_start = MaxSector; |
1da177e4 LT |
2967 | } |
2968 | conf->raid_disks = mddev->raid_disks; | |
2969 | conf->mddev = mddev; | |
1da177e4 | 2970 | INIT_LIST_HEAD(&conf->retry_list); |
55ce74d4 | 2971 | INIT_LIST_HEAD(&conf->bio_end_io_list); |
1da177e4 LT |
2972 | |
2973 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2974 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2975 | |
191ea9b2 | 2976 | bio_list_init(&conf->pending_bio_list); |
34db0cd6 | 2977 | conf->pending_count = 0; |
d890fa2b | 2978 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 2979 | |
c19d5798 | 2980 | err = -EIO; |
8f19ccb2 | 2981 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2982 | |
2983 | disk = conf->mirrors + i; | |
2984 | ||
c19d5798 N |
2985 | if (i < conf->raid_disks && |
2986 | disk[conf->raid_disks].rdev) { | |
2987 | /* This slot has a replacement. */ | |
2988 | if (!disk->rdev) { | |
2989 | /* No original, just make the replacement | |
2990 | * a recovering spare | |
2991 | */ | |
2992 | disk->rdev = | |
2993 | disk[conf->raid_disks].rdev; | |
2994 | disk[conf->raid_disks].rdev = NULL; | |
2995 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
2996 | /* Original is not in_sync - bad */ | |
2997 | goto abort; | |
2998 | } | |
2999 | ||
5fd6c1dc N |
3000 | if (!disk->rdev || |
3001 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 3002 | disk->head_position = 0; |
4f0a5e01 JB |
3003 | if (disk->rdev && |
3004 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 3005 | conf->fullsync = 1; |
be4d3280 | 3006 | } |
1da177e4 | 3007 | } |
709ae487 | 3008 | |
709ae487 | 3009 | err = -ENOMEM; |
0232605d | 3010 | conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
1d41c216 | 3011 | if (!conf->thread) |
709ae487 | 3012 | goto abort; |
1da177e4 | 3013 | |
709ae487 N |
3014 | return conf; |
3015 | ||
3016 | abort: | |
3017 | if (conf) { | |
644df1a8 | 3018 | mempool_destroy(conf->r1bio_pool); |
709ae487 N |
3019 | kfree(conf->mirrors); |
3020 | safe_put_page(conf->tmppage); | |
3021 | kfree(conf->poolinfo); | |
fd76863e | 3022 | kfree(conf->nr_pending); |
3023 | kfree(conf->nr_waiting); | |
3024 | kfree(conf->nr_queued); | |
3025 | kfree(conf->barrier); | |
c230e7e5 N |
3026 | if (conf->bio_split) |
3027 | bioset_free(conf->bio_split); | |
709ae487 N |
3028 | kfree(conf); |
3029 | } | |
3030 | return ERR_PTR(err); | |
3031 | } | |
3032 | ||
afa0f557 | 3033 | static void raid1_free(struct mddev *mddev, void *priv); |
849674e4 | 3034 | static int raid1_run(struct mddev *mddev) |
709ae487 | 3035 | { |
e8096360 | 3036 | struct r1conf *conf; |
709ae487 | 3037 | int i; |
3cb03002 | 3038 | struct md_rdev *rdev; |
5220ea1e | 3039 | int ret; |
2ff8cc2c | 3040 | bool discard_supported = false; |
709ae487 N |
3041 | |
3042 | if (mddev->level != 1) { | |
1d41c216 N |
3043 | pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", |
3044 | mdname(mddev), mddev->level); | |
709ae487 N |
3045 | return -EIO; |
3046 | } | |
3047 | if (mddev->reshape_position != MaxSector) { | |
1d41c216 N |
3048 | pr_warn("md/raid1:%s: reshape_position set but not supported\n", |
3049 | mdname(mddev)); | |
709ae487 N |
3050 | return -EIO; |
3051 | } | |
a415c0f1 N |
3052 | if (mddev_init_writes_pending(mddev) < 0) |
3053 | return -ENOMEM; | |
1da177e4 | 3054 | /* |
709ae487 N |
3055 | * copy the already verified devices into our private RAID1 |
3056 | * bookkeeping area. [whatever we allocate in run(), | |
afa0f557 | 3057 | * should be freed in raid1_free()] |
1da177e4 | 3058 | */ |
709ae487 N |
3059 | if (mddev->private == NULL) |
3060 | conf = setup_conf(mddev); | |
3061 | else | |
3062 | conf = mddev->private; | |
1da177e4 | 3063 | |
709ae487 N |
3064 | if (IS_ERR(conf)) |
3065 | return PTR_ERR(conf); | |
1da177e4 | 3066 | |
3deff1a7 | 3067 | if (mddev->queue) { |
5026d7a9 | 3068 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
3deff1a7 CH |
3069 | blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
3070 | } | |
5026d7a9 | 3071 | |
dafb20fa | 3072 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
3073 | if (!mddev->gendisk) |
3074 | continue; | |
709ae487 N |
3075 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
3076 | rdev->data_offset << 9); | |
2ff8cc2c SL |
3077 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
3078 | discard_supported = true; | |
1da177e4 | 3079 | } |
191ea9b2 | 3080 | |
709ae487 N |
3081 | mddev->degraded = 0; |
3082 | for (i=0; i < conf->raid_disks; i++) | |
3083 | if (conf->mirrors[i].rdev == NULL || | |
3084 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
3085 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
3086 | mddev->degraded++; | |
3087 | ||
3088 | if (conf->raid_disks - mddev->degraded == 1) | |
3089 | mddev->recovery_cp = MaxSector; | |
3090 | ||
8c6ac868 | 3091 | if (mddev->recovery_cp != MaxSector) |
1d41c216 N |
3092 | pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", |
3093 | mdname(mddev)); | |
3094 | pr_info("md/raid1:%s: active with %d out of %d mirrors\n", | |
f72ffdd6 | 3095 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
1da177e4 | 3096 | mddev->raid_disks); |
709ae487 | 3097 | |
1da177e4 LT |
3098 | /* |
3099 | * Ok, everything is just fine now | |
3100 | */ | |
709ae487 N |
3101 | mddev->thread = conf->thread; |
3102 | conf->thread = NULL; | |
3103 | mddev->private = conf; | |
46533ff7 | 3104 | set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); |
709ae487 | 3105 | |
1f403624 | 3106 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 3107 | |
1ed7242e | 3108 | if (mddev->queue) { |
2ff8cc2c SL |
3109 | if (discard_supported) |
3110 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, | |
3111 | mddev->queue); | |
3112 | else | |
3113 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
3114 | mddev->queue); | |
1ed7242e | 3115 | } |
5220ea1e | 3116 | |
3117 | ret = md_integrity_register(mddev); | |
5aa61f42 N |
3118 | if (ret) { |
3119 | md_unregister_thread(&mddev->thread); | |
afa0f557 | 3120 | raid1_free(mddev, conf); |
5aa61f42 | 3121 | } |
5220ea1e | 3122 | return ret; |
1da177e4 LT |
3123 | } |
3124 | ||
afa0f557 | 3125 | static void raid1_free(struct mddev *mddev, void *priv) |
1da177e4 | 3126 | { |
afa0f557 | 3127 | struct r1conf *conf = priv; |
409c57f3 | 3128 | |
644df1a8 | 3129 | mempool_destroy(conf->r1bio_pool); |
990a8baf | 3130 | kfree(conf->mirrors); |
0fea7ed8 | 3131 | safe_put_page(conf->tmppage); |
990a8baf | 3132 | kfree(conf->poolinfo); |
fd76863e | 3133 | kfree(conf->nr_pending); |
3134 | kfree(conf->nr_waiting); | |
3135 | kfree(conf->nr_queued); | |
3136 | kfree(conf->barrier); | |
c230e7e5 N |
3137 | if (conf->bio_split) |
3138 | bioset_free(conf->bio_split); | |
1da177e4 | 3139 | kfree(conf); |
1da177e4 LT |
3140 | } |
3141 | ||
fd01b88c | 3142 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
3143 | { |
3144 | /* no resync is happening, and there is enough space | |
3145 | * on all devices, so we can resize. | |
3146 | * We need to make sure resync covers any new space. | |
3147 | * If the array is shrinking we should possibly wait until | |
3148 | * any io in the removed space completes, but it hardly seems | |
3149 | * worth it. | |
3150 | */ | |
a4a6125a N |
3151 | sector_t newsize = raid1_size(mddev, sectors, 0); |
3152 | if (mddev->external_size && | |
3153 | mddev->array_sectors > newsize) | |
b522adcd | 3154 | return -EINVAL; |
a4a6125a N |
3155 | if (mddev->bitmap) { |
3156 | int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); | |
3157 | if (ret) | |
3158 | return ret; | |
3159 | } | |
3160 | md_set_array_sectors(mddev, newsize); | |
b522adcd | 3161 | if (sectors > mddev->dev_sectors && |
b098636c | 3162 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 3163 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
3164 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3165 | } | |
b522adcd | 3166 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 3167 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
3168 | return 0; |
3169 | } | |
3170 | ||
fd01b88c | 3171 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
3172 | { |
3173 | /* We need to: | |
3174 | * 1/ resize the r1bio_pool | |
3175 | * 2/ resize conf->mirrors | |
3176 | * | |
3177 | * We allocate a new r1bio_pool if we can. | |
3178 | * Then raise a device barrier and wait until all IO stops. | |
3179 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
3180 | * |
3181 | * At the same time, we "pack" the devices so that all the missing | |
3182 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
3183 | */ |
3184 | mempool_t *newpool, *oldpool; | |
3185 | struct pool_info *newpoolinfo; | |
0eaf822c | 3186 | struct raid1_info *newmirrors; |
e8096360 | 3187 | struct r1conf *conf = mddev->private; |
63c70c4f | 3188 | int cnt, raid_disks; |
c04be0aa | 3189 | unsigned long flags; |
2214c260 | 3190 | int d, d2; |
1da177e4 | 3191 | |
63c70c4f | 3192 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 3193 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
3194 | mddev->layout != mddev->new_layout || |
3195 | mddev->level != mddev->new_level) { | |
664e7c41 | 3196 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
3197 | mddev->new_layout = mddev->layout; |
3198 | mddev->new_level = mddev->level; | |
3199 | return -EINVAL; | |
3200 | } | |
3201 | ||
2214c260 AP |
3202 | if (!mddev_is_clustered(mddev)) |
3203 | md_allow_write(mddev); | |
2a2275d6 | 3204 | |
63c70c4f N |
3205 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
3206 | ||
6ea9c07c N |
3207 | if (raid_disks < conf->raid_disks) { |
3208 | cnt=0; | |
3209 | for (d= 0; d < conf->raid_disks; d++) | |
3210 | if (conf->mirrors[d].rdev) | |
3211 | cnt++; | |
3212 | if (cnt > raid_disks) | |
1da177e4 | 3213 | return -EBUSY; |
6ea9c07c | 3214 | } |
1da177e4 LT |
3215 | |
3216 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
3217 | if (!newpoolinfo) | |
3218 | return -ENOMEM; | |
3219 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 3220 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 LT |
3221 | |
3222 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
3223 | r1bio_pool_free, newpoolinfo); | |
3224 | if (!newpool) { | |
3225 | kfree(newpoolinfo); | |
3226 | return -ENOMEM; | |
3227 | } | |
0eaf822c | 3228 | newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, |
8f19ccb2 | 3229 | GFP_KERNEL); |
1da177e4 LT |
3230 | if (!newmirrors) { |
3231 | kfree(newpoolinfo); | |
3232 | mempool_destroy(newpool); | |
3233 | return -ENOMEM; | |
3234 | } | |
1da177e4 | 3235 | |
e2d59925 | 3236 | freeze_array(conf, 0); |
1da177e4 LT |
3237 | |
3238 | /* ok, everything is stopped */ | |
3239 | oldpool = conf->r1bio_pool; | |
3240 | conf->r1bio_pool = newpool; | |
6ea9c07c | 3241 | |
a88aa786 | 3242 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 3243 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 3244 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 3245 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 3246 | rdev->raid_disk = d2; |
36fad858 NK |
3247 | sysfs_unlink_rdev(mddev, rdev); |
3248 | if (sysfs_link_rdev(mddev, rdev)) | |
1d41c216 N |
3249 | pr_warn("md/raid1:%s: cannot register rd%d\n", |
3250 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 3251 | } |
a88aa786 N |
3252 | if (rdev) |
3253 | newmirrors[d2++].rdev = rdev; | |
3254 | } | |
1da177e4 LT |
3255 | kfree(conf->mirrors); |
3256 | conf->mirrors = newmirrors; | |
3257 | kfree(conf->poolinfo); | |
3258 | conf->poolinfo = newpoolinfo; | |
3259 | ||
c04be0aa | 3260 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 3261 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 3262 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 3263 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 3264 | mddev->delta_disks = 0; |
1da177e4 | 3265 | |
e2d59925 | 3266 | unfreeze_array(conf); |
1da177e4 | 3267 | |
985ca973 | 3268 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
1da177e4 LT |
3269 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3270 | md_wakeup_thread(mddev->thread); | |
3271 | ||
3272 | mempool_destroy(oldpool); | |
3273 | return 0; | |
3274 | } | |
3275 | ||
fd01b88c | 3276 | static void raid1_quiesce(struct mddev *mddev, int state) |
36fa3063 | 3277 | { |
e8096360 | 3278 | struct r1conf *conf = mddev->private; |
36fa3063 N |
3279 | |
3280 | switch(state) { | |
6eef4b21 N |
3281 | case 2: /* wake for suspend */ |
3282 | wake_up(&conf->wait_barrier); | |
3283 | break; | |
9e6603da | 3284 | case 1: |
07169fd4 | 3285 | freeze_array(conf, 0); |
36fa3063 | 3286 | break; |
9e6603da | 3287 | case 0: |
07169fd4 | 3288 | unfreeze_array(conf); |
36fa3063 N |
3289 | break; |
3290 | } | |
36fa3063 N |
3291 | } |
3292 | ||
fd01b88c | 3293 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
3294 | { |
3295 | /* raid1 can take over: | |
3296 | * raid5 with 2 devices, any layout or chunk size | |
3297 | */ | |
3298 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 3299 | struct r1conf *conf; |
709ae487 N |
3300 | mddev->new_level = 1; |
3301 | mddev->new_layout = 0; | |
3302 | mddev->new_chunk_sectors = 0; | |
3303 | conf = setup_conf(mddev); | |
6995f0b2 | 3304 | if (!IS_ERR(conf)) { |
07169fd4 | 3305 | /* Array must appear to be quiesced */ |
3306 | conf->array_frozen = 1; | |
394ed8e4 SL |
3307 | mddev_clear_unsupported_flags(mddev, |
3308 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 3309 | } |
709ae487 N |
3310 | return conf; |
3311 | } | |
3312 | return ERR_PTR(-EINVAL); | |
3313 | } | |
1da177e4 | 3314 | |
84fc4b56 | 3315 | static struct md_personality raid1_personality = |
1da177e4 LT |
3316 | { |
3317 | .name = "raid1", | |
2604b703 | 3318 | .level = 1, |
1da177e4 | 3319 | .owner = THIS_MODULE, |
849674e4 SL |
3320 | .make_request = raid1_make_request, |
3321 | .run = raid1_run, | |
afa0f557 | 3322 | .free = raid1_free, |
849674e4 SL |
3323 | .status = raid1_status, |
3324 | .error_handler = raid1_error, | |
1da177e4 LT |
3325 | .hot_add_disk = raid1_add_disk, |
3326 | .hot_remove_disk= raid1_remove_disk, | |
3327 | .spare_active = raid1_spare_active, | |
849674e4 | 3328 | .sync_request = raid1_sync_request, |
1da177e4 | 3329 | .resize = raid1_resize, |
80c3a6ce | 3330 | .size = raid1_size, |
63c70c4f | 3331 | .check_reshape = raid1_reshape, |
36fa3063 | 3332 | .quiesce = raid1_quiesce, |
709ae487 | 3333 | .takeover = raid1_takeover, |
5c675f83 | 3334 | .congested = raid1_congested, |
1da177e4 LT |
3335 | }; |
3336 | ||
3337 | static int __init raid_init(void) | |
3338 | { | |
2604b703 | 3339 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
3340 | } |
3341 | ||
3342 | static void raid_exit(void) | |
3343 | { | |
2604b703 | 3344 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
3345 | } |
3346 | ||
3347 | module_init(raid_init); | |
3348 | module_exit(raid_exit); | |
3349 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3350 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 3351 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 3352 | MODULE_ALIAS("md-raid1"); |
2604b703 | 3353 | MODULE_ALIAS("md-level-1"); |
34db0cd6 N |
3354 | |
3355 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |